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net/sctp/sm_statefuns.c
202 KB
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/* SCTP kernel implementation |
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* (C) Copyright IBM Corp. 2001, 2004 * Copyright (c) 1999-2000 Cisco, Inc. * Copyright (c) 1999-2001 Motorola, Inc. * Copyright (c) 2001-2002 Intel Corp. * Copyright (c) 2002 Nokia Corp. * |
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* This is part of the SCTP Linux Kernel Implementation. |
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* * These are the state functions for the state machine. * |
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* This SCTP implementation is free software; |
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* you can redistribute it and/or modify it under the terms of * the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * |
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* This SCTP implementation is distributed in the hope that it |
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied * ************************ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License |
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* along with GNU CC; see the file COPYING. If not, see * <http://www.gnu.org/licenses/>. |
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* * Please send any bug reports or fixes you make to the * email address(es): |
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* lksctp developers <linux-sctp@vger.kernel.org> |
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* |
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* Written or modified by: * La Monte H.P. Yarroll <piggy@acm.org> * Karl Knutson <karl@athena.chicago.il.us> * Mathew Kotowsky <kotowsky@sctp.org> * Sridhar Samudrala <samudrala@us.ibm.com> * Jon Grimm <jgrimm@us.ibm.com> * Hui Huang <hui.huang@nokia.com> * Dajiang Zhang <dajiang.zhang@nokia.com> * Daisy Chang <daisyc@us.ibm.com> * Ardelle Fan <ardelle.fan@intel.com> * Ryan Layer <rmlayer@us.ibm.com> * Kevin Gao <kevin.gao@intel.com> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/types.h> #include <linux/kernel.h> #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/net.h> #include <linux/inet.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> #include <net/inet_ecn.h> #include <linux/skbuff.h> #include <net/sctp/sctp.h> #include <net/sctp/sm.h> #include <net/sctp/structs.h> |
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static struct sctp_packet *sctp_abort_pkt_new( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, struct sctp_chunk *chunk, const void *payload, size_t paylen); |
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static int sctp_eat_data(const struct sctp_association *asoc, struct sctp_chunk *chunk, |
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struct sctp_cmd_seq *commands); |
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static struct sctp_packet *sctp_ootb_pkt_new( struct net *net, const struct sctp_association *asoc, const struct sctp_chunk *chunk); |
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static void sctp_send_stale_cookie_err(struct net *net, const struct sctp_endpoint *ep, |
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const struct sctp_association *asoc, const struct sctp_chunk *chunk, |
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struct sctp_cmd_seq *commands, |
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struct sctp_chunk *err_chunk); |
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static enum sctp_disposition sctp_sf_do_5_2_6_stale( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands); static enum sctp_disposition sctp_sf_shut_8_4_5( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands); static enum sctp_disposition sctp_sf_tabort_8_4_8( struct net *net, |
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const struct sctp_endpoint *ep, |
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const struct sctp_association *asoc, |
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const union sctp_subtype type, |
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void *arg, |
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struct sctp_cmd_seq *commands); |
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static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
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static enum sctp_disposition sctp_stop_t1_and_abort( struct net *net, struct sctp_cmd_seq *commands, __be16 error, int sk_err, const struct sctp_association *asoc, struct sctp_transport *transport); |
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|
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static enum sctp_disposition sctp_sf_abort_violation( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, void *arg, struct sctp_cmd_seq *commands, const __u8 *payload, const size_t paylen); |
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|
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static enum sctp_disposition sctp_sf_violation_chunklen( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands); |
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|
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static enum sctp_disposition sctp_sf_violation_paramlen( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, void *ext, struct sctp_cmd_seq *commands); |
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static enum sctp_disposition sctp_sf_violation_ctsn( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands); |
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static enum sctp_disposition sctp_sf_violation_chunk( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands); |
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|
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static enum sctp_ierror sctp_sf_authenticate( |
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const struct sctp_association *asoc, |
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struct sctp_chunk *chunk); |
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|
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static enum sctp_disposition __sctp_sf_do_9_1_abort( struct net *net, |
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const struct sctp_endpoint *ep, |
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const struct sctp_association *asoc, |
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const union sctp_subtype type, |
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void *arg, |
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struct sctp_cmd_seq *commands); |
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|
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/* Small helper function that checks if the chunk length * is of the appropriate length. The 'required_length' argument * is set to be the size of a specific chunk we are testing. |
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* Return Values: true = Valid length * false = Invalid length |
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* */ |
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static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, __u16 required_length) |
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{ __u16 chunk_length = ntohs(chunk->chunk_hdr->length); |
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/* Previously already marked? */ if (unlikely(chunk->pdiscard)) |
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return false; |
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if (unlikely(chunk_length < required_length)) |
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return false; |
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|
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return true; |
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} /********************************************************** * These are the state functions for handling chunk events. **********************************************************/ /* * Process the final SHUTDOWN COMPLETE. * * Section: 4 (C) (diagram), 9.2 * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint * should stop the T2-shutdown timer and remove all knowledge of the * association (and thus the association enters the CLOSED state). * |
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* Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
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* C) Rules for packet carrying SHUTDOWN COMPLETE: * ... |
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* - The receiver of a SHUTDOWN COMPLETE shall accept the packet * if the Verification Tag field of the packet matches its own tag and * the T bit is not set * OR * it is set to its peer's tag and the T bit is set in the Chunk * Flags. * Otherwise, the receiver MUST silently discard the packet * and take no further action. An endpoint MUST ignore the * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. |
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* * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
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enum sctp_disposition sctp_sf_do_4_C(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
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{ struct sctp_chunk *chunk = arg; struct sctp_ulpevent *ev; |
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if (!sctp_vtag_verify_either(chunk, asoc)) |
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return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
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|
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/* RFC 2960 6.10 Bundling * * An endpoint MUST NOT bundle INIT, INIT ACK or * SHUTDOWN COMPLETE with any other chunks. */ if (!chunk->singleton) |
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return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
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|
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/* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
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if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
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return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
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commands); |
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/* RFC 2960 10.2 SCTP-to-ULP * * H) SHUTDOWN COMPLETE notification * * When SCTP completes the shutdown procedures (section 9.2) this * notification is passed to the upper layer. */ ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, |
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0, 0, 0, NULL, GFP_ATOMIC); |
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if (ev) sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
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SCTP_ULPEVENT(ev)); |
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/* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint * will verify that it is in SHUTDOWN-ACK-SENT state, if it is * not the chunk should be discarded. If the endpoint is in * the SHUTDOWN-ACK-SENT state the endpoint should stop the * T2-shutdown timer and remove all knowledge of the * association (and thus the association enters the CLOSED * state). */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_CLOSED)); |
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SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
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sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); return SCTP_DISPOSITION_DELETE_TCB; |
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} /* * Respond to a normal INIT chunk. * We are the side that is being asked for an association. * * Section: 5.1 Normal Establishment of an Association, B * B) "Z" shall respond immediately with an INIT ACK chunk. The * destination IP address of the INIT ACK MUST be set to the source * IP address of the INIT to which this INIT ACK is responding. In * the response, besides filling in other parameters, "Z" must set the * Verification Tag field to Tag_A, and also provide its own * Verification Tag (Tag_Z) in the Initiate Tag field. * |
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* Verification Tag: Must be 0. |
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* * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
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enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
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{ |
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struct sctp_chunk *chunk = arg, *repl, *err_chunk; struct sctp_unrecognized_param *unk_param; |
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struct sctp_association *new_asoc; |
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struct sctp_packet *packet; |
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int len; /* 6.10 Bundling * An endpoint MUST NOT bundle INIT, INIT ACK or * SHUTDOWN COMPLETE with any other chunks. |
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* |
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* IG Section 2.11.2 * Furthermore, we require that the receiver of an INIT chunk MUST * enforce these rules by silently discarding an arriving packet * with an INIT chunk that is bundled with other chunks. */ if (!chunk->singleton) |
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return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
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/* If the packet is an OOTB packet which is temporarily on the * control endpoint, respond with an ABORT. */ |
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if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
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SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
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return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
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} |
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|
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/* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
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* Tag. |
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*/ if (chunk->sctp_hdr->vtag != 0) |
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return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
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/* Make sure that the INIT chunk has a valid length. * Normally, this would cause an ABORT with a Protocol Violation * error, but since we don't have an association, we'll * just discard the packet. */ |
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if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
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return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
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|
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/* If the INIT is coming toward a closing socket, we'll send back * and ABORT. Essentially, this catches the race of INIT being * backloged to the socket at the same time as the user isses close(). * Since the socket and all its associations are going away, we * can treat this OOTB */ if (sctp_sstate(ep->base.sk, CLOSING)) |
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return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
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|
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/* Verify the INIT chunk before processing it. */ err_chunk = NULL; |
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if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
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(struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
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&err_chunk)) { /* This chunk contains fatal error. It is to be discarded. * Send an ABORT, with causes if there is any. */ if (err_chunk) { |
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packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
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(__u8 *)(err_chunk->chunk_hdr) + |
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sizeof(struct sctp_chunkhdr), |
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ntohs(err_chunk->chunk_hdr->length) - |
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sizeof(struct sctp_chunkhdr)); |
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sctp_chunk_free(err_chunk); if (packet) { sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
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SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
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return SCTP_DISPOSITION_CONSUME; } else { return SCTP_DISPOSITION_NOMEM; } } else { |
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return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
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commands); } } |
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/* Grab the INIT header. */ |
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chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
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/* Tag the variable length parameters. */ |
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chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
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new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); if (!new_asoc) goto nomem; |
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if (sctp_assoc_set_bind_addr_from_ep(new_asoc, sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) goto nomem_init; |
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/* The call, sctp_process_init(), can fail on memory allocation. */ |
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if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
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(struct sctp_init_chunk *)chunk->chunk_hdr, |
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GFP_ATOMIC)) goto nomem_init; |
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/* B) "Z" shall respond immediately with an INIT ACK chunk. */ /* If there are errors need to be reported for unknown parameters, * make sure to reserve enough room in the INIT ACK for them. */ len = 0; if (err_chunk) len = ntohs(err_chunk->chunk_hdr->length) - |
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sizeof(struct sctp_chunkhdr); |
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|
1da177e4c Linux-2.6.12-rc2 |
412 413 |
repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); if (!repl) |
df7deeb54 [SCTP]: Cleanup n... |
414 |
goto nomem_init; |
1da177e4c Linux-2.6.12-rc2 |
415 416 417 418 419 420 421 422 423 424 425 426 427 |
/* If there are errors need to be reported for unknown parameters, * include them in the outgoing INIT ACK as "Unrecognized parameter" * parameter. */ if (err_chunk) { /* Get the "Unrecognized parameter" parameter(s) out of the * ERROR chunk generated by sctp_verify_init(). Since the * error cause code for "unknown parameter" and the * "Unrecognized parameter" type is the same, we can * construct the parameters in INIT ACK by copying the * ERROR causes over. */ |
62e6b7e4e sctp: remove the ... |
428 |
unk_param = (struct sctp_unrecognized_param *) |
1da177e4c Linux-2.6.12-rc2 |
429 |
((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5be sctp: remove the ... |
430 |
sizeof(struct sctp_chunkhdr)); |
1da177e4c Linux-2.6.12-rc2 |
431 432 433 434 435 436 |
/* Replace the cause code with the "Unrecognized parameter" * parameter type. */ sctp_addto_chunk(repl, len, unk_param); sctp_chunk_free(err_chunk); } |
df7deeb54 [SCTP]: Cleanup n... |
437 |
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4c Linux-2.6.12-rc2 |
438 439 440 441 442 443 444 445 446 447 448 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); /* * Note: After sending out INIT ACK with the State Cookie parameter, * "Z" MUST NOT allocate any resources, nor keep any states for the * new association. Otherwise, "Z" will be vulnerable to resource * attacks. */ sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); return SCTP_DISPOSITION_DELETE_TCB; |
1da177e4c Linux-2.6.12-rc2 |
449 450 451 |
nomem_init: sctp_association_free(new_asoc); nomem: |
df7deeb54 [SCTP]: Cleanup n... |
452 453 |
if (err_chunk) sctp_chunk_free(err_chunk); |
1da177e4c Linux-2.6.12-rc2 |
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 |
return SCTP_DISPOSITION_NOMEM; } /* * Respond to a normal INIT ACK chunk. * We are the side that is initiating the association. * * Section: 5.1 Normal Establishment of an Association, C * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init * timer and leave COOKIE-WAIT state. "A" shall then send the State * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start * the T1-cookie timer, and enter the COOKIE-ECHOED state. * * Note: The COOKIE ECHO chunk can be bundled with any pending outbound * DATA chunks, but it MUST be the first chunk in the packet and * until the COOKIE ACK is returned the sender MUST NOT send any * other packets to the peer. * * Verification Tag: 3.3.3 * If the value of the Initiate Tag in a received INIT ACK chunk is * found to be 0, the receiver MUST treat it as an error and close the * association by transmitting an ABORT. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
485 486 487 488 489 490 |
enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
491 |
{ |
01a992bea sctp: remove the ... |
492 |
struct sctp_init_chunk *initchunk; |
172a1599b sctp: remove the ... |
493 |
struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
494 495 |
struct sctp_chunk *err_chunk; struct sctp_packet *packet; |
1da177e4c Linux-2.6.12-rc2 |
496 497 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
498 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
499 |
|
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 504 |
/* 6.10 Bundling * An endpoint MUST NOT bundle INIT, INIT ACK or * SHUTDOWN COMPLETE with any other chunks. */ if (!chunk->singleton) |
24cb81a6a sctp: Push struct... |
505 |
return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
506 |
|
ece25dfa0 SCTP: Clean up OO... |
507 |
/* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c47 sctp: remove the ... |
508 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6a sctp: Push struct... |
509 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
510 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
511 |
/* Grab the INIT header. */ |
4ae70c084 sctp: remove the ... |
512 |
chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4c Linux-2.6.12-rc2 |
513 |
|
1da177e4c Linux-2.6.12-rc2 |
514 515 |
/* Verify the INIT chunk before processing it. */ err_chunk = NULL; |
b14878ccb net: sctp: cache ... |
516 |
if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992bea sctp: remove the ... |
517 |
(struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4c Linux-2.6.12-rc2 |
518 |
&err_chunk)) { |
2a4932167 sctp: remove the ... |
519 |
enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b505 [SCTP]: Correctly... |
520 |
|
1da177e4c Linux-2.6.12-rc2 |
521 |
/* This chunk contains fatal error. It is to be discarded. |
d67011913 [SCTP]: Follow Ad... |
522 523 524 |
* Send an ABORT, with causes. If there are no causes, * then there wasn't enough memory. Just terminate * the association. |
1da177e4c Linux-2.6.12-rc2 |
525 526 |
*/ if (err_chunk) { |
24cb81a6a sctp: Push struct... |
527 |
packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4c Linux-2.6.12-rc2 |
528 |
(__u8 *)(err_chunk->chunk_hdr) + |
922dbc5be sctp: remove the ... |
529 |
sizeof(struct sctp_chunkhdr), |
1da177e4c Linux-2.6.12-rc2 |
530 |
ntohs(err_chunk->chunk_hdr->length) - |
922dbc5be sctp: remove the ... |
531 |
sizeof(struct sctp_chunkhdr)); |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 535 536 537 |
sctp_chunk_free(err_chunk); if (packet) { sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
24cb81a6a sctp: Push struct... |
538 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c8738 [SCTP]: Set sk_er... |
539 |
error = SCTP_ERROR_INV_PARAM; |
1da177e4c Linux-2.6.12-rc2 |
540 |
} |
1da177e4c Linux-2.6.12-rc2 |
541 |
} |
bbd0d5980 [SCTP]: Implement... |
542 543 544 545 546 547 548 549 550 |
/* SCTP-AUTH, Section 6.3: * It should be noted that if the receiver wants to tear * down an association in an authenticated way only, the * handling of malformed packets should not result in * tearing down the association. * * This means that if we only want to abort associations * in an authenticated way (i.e AUTH+ABORT), then we |
25985edce Fix common misspe... |
551 |
* can't destroy this association just because the packet |
bbd0d5980 [SCTP]: Implement... |
552 553 554 |
* was malformed. */ if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
24cb81a6a sctp: Push struct... |
555 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d5980 [SCTP]: Implement... |
556 |
|
24cb81a6a sctp: Push struct... |
557 558 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, |
8de8c8738 [SCTP]: Set sk_er... |
559 |
asoc, chunk->transport); |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 |
} /* Tag the variable length parameters. Note that we never * convert the parameters in an INIT chunk. */ |
4ae70c084 sctp: remove the ... |
565 |
chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4c Linux-2.6.12-rc2 |
566 |
|
01a992bea sctp: remove the ... |
567 |
initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4c Linux-2.6.12-rc2 |
568 569 570 |
sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, SCTP_PEER_INIT(initchunk)); |
3f7a87d2f [SCTP] sctp_conne... |
571 572 |
/* Reset init error count upon receipt of INIT-ACK. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
573 574 575 576 577 578 579 580 581 582 |
/* 5.1 C) "A" shall stop the T1-init timer and leave * COOKIE-WAIT state. "A" shall then ... start the T1-cookie * timer, and enter the COOKIE-ECHOED state. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); |
730fc3d05 [SCTP]: Implete S... |
583 584 585 586 |
/* SCTP-AUTH: genereate the assocition shared keys so that * we can potentially signe the COOKIE-ECHO. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 590 591 592 593 594 595 596 |
/* 5.1 C) "A" shall then send the State Cookie received in the * INIT ACK chunk in a COOKIE ECHO chunk, ... */ /* If there is any errors to report, send the ERROR chunk generated * for unknown parameters as well. */ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, SCTP_CHUNK(err_chunk)); return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
597 |
} |
3b54f1fd8 sctp: delay the a... |
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 |
static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, const struct sctp_association *asoc) { struct sctp_chunk auth; if (!chunk->auth_chunk) return true; /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo * is supposed to be authenticated and we have to do delayed * authentication. We've just recreated the association using * the information in the cookie and now it's much easier to * do the authentication. */ /* Make sure that we and the peer are AUTH capable */ if (!net->sctp.auth_enable || !asoc->peer.auth_capable) return false; /* set-up our fake chunk so that we can process it */ auth.skb = chunk->auth_chunk; auth.asoc = chunk->asoc; auth.sctp_hdr = chunk->sctp_hdr; auth.chunk_hdr = (struct sctp_chunkhdr *) skb_push(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); auth.transport = chunk->transport; return sctp_sf_authenticate(asoc, &auth) == SCTP_IERROR_NO_ERROR; } |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 |
/* * Respond to a normal COOKIE ECHO chunk. * We are the side that is being asked for an association. * * Section: 5.1 Normal Establishment of an Association, D * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply * with a COOKIE ACK chunk after building a TCB and moving to * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK * chunk MUST be the first chunk in the packet. * * IMPLEMENTATION NOTE: An implementation may choose to send the * Communication Up notification to the SCTP user upon reception * of a valid COOKIE ECHO chunk. * * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules * D) Rules for packet carrying a COOKIE ECHO * * - When sending a COOKIE ECHO, the endpoint MUST use the value of the * Initial Tag received in the INIT ACK. * * - The receiver of a COOKIE ECHO follows the procedures in Section 5. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
660 661 662 663 664 665 |
enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
666 |
{ |
172a1599b sctp: remove the ... |
667 |
struct sctp_ulpevent *ev, *ai_ev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
668 |
struct sctp_association *new_asoc; |
01a992bea sctp: remove the ... |
669 |
struct sctp_init_chunk *peer_init; |
172a1599b sctp: remove the ... |
670 |
struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
671 |
struct sctp_chunk *err_chk_p; |
172a1599b sctp: remove the ... |
672 |
struct sctp_chunk *repl; |
609ee4679 SCTP: Abort on CO... |
673 |
struct sock *sk; |
172a1599b sctp: remove the ... |
674 |
int error = 0; |
1da177e4c Linux-2.6.12-rc2 |
675 676 677 678 |
/* If the packet is an OOTB packet which is temporarily on the * control endpoint, respond with an ABORT. */ |
2ce955035 sctp: Make the ct... |
679 |
if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a24078 sctp: Make the mi... |
680 |
SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6a sctp: Push struct... |
681 |
return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89df sctp: Fix the SNM... |
682 |
} |
1da177e4c Linux-2.6.12-rc2 |
683 684 685 686 687 688 |
/* Make sure that the COOKIE_ECHO chunk has a valid length. * In this case, we check that we have enough for at least a * chunk header. More detailed verification is done * in sctp_unpack_cookie(). */ |
922dbc5be sctp: remove the ... |
689 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
690 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
691 |
|
609ee4679 SCTP: Abort on CO... |
692 693 694 695 696 697 698 |
/* If the endpoint is not listening or if the number of associations * on the TCP-style socket exceed the max backlog, respond with an * ABORT. */ sk = ep->base.sk; if (!sctp_sstate(sk, LISTENING) || (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) |
24cb81a6a sctp: Push struct... |
699 |
return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee4679 SCTP: Abort on CO... |
700 |
|
1da177e4c Linux-2.6.12-rc2 |
701 702 703 |
/* "Decode" the chunk. We have no optional parameters so we * are in good shape. */ |
d808ad9ab [NET] SCTP: Fix w... |
704 |
chunk->subh.cookie_hdr = |
1da177e4c Linux-2.6.12-rc2 |
705 |
(struct sctp_signed_cookie *)chunk->skb->data; |
62b08083e [SCTP]: Fix panic... |
706 |
if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5be sctp: remove the ... |
707 |
sizeof(struct sctp_chunkhdr))) |
62b08083e [SCTP]: Fix panic... |
708 |
goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 |
/* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint * "Z" will reply with a COOKIE ACK chunk after building a TCB * and moving to the ESTABLISHED state. */ new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, &err_chk_p); /* FIXME: * If the re-build failed, what is the proper error path * from here? * * [We should abort the association. --piggy] */ if (!new_asoc) { /* FIXME: Several errors are possible. A bad cookie should * be silently discarded, but think about logging it too. */ switch (error) { case -SCTP_IERROR_NOMEM: goto nomem; case -SCTP_IERROR_STALE_COOKIE: |
24cb81a6a sctp: Push struct... |
732 |
sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
733 |
err_chk_p); |
24cb81a6a sctp: Push struct... |
734 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 |
case -SCTP_IERROR_BAD_SIG: default: |
24cb81a6a sctp: Push struct... |
738 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b799 [NET]: cleanup ex... |
739 |
} |
1da177e4c Linux-2.6.12-rc2 |
740 |
} |
1da177e4c Linux-2.6.12-rc2 |
741 |
|
df7deeb54 [SCTP]: Cleanup n... |
742 743 744 |
/* Delay state machine commands until later. * * Re-build the bind address for the association is done in |
1da177e4c Linux-2.6.12-rc2 |
745 746 747 748 749 750 |
* the sctp_unpack_cookie() already. */ /* This is a brand-new association, so these are not yet side * effects--it is safe to run them here. */ peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; |
de6becdc0 sctp: fix to chec... |
751 |
if (!sctp_process_init(new_asoc, chunk, |
6a1e5f335 [SCTP]: sctp_proc... |
752 |
&chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4c Linux-2.6.12-rc2 |
753 754 |
peer_init, GFP_ATOMIC)) goto nomem_init; |
730fc3d05 [SCTP]: Implete S... |
755 756 757 758 759 760 761 |
/* SCTP-AUTH: Now that we've populate required fields in * sctp_process_init, set up the assocaition shared keys as * necessary so that we can potentially authenticate the ACK */ error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); if (error) goto nomem_init; |
3b54f1fd8 sctp: delay the a... |
762 763 764 |
if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) { sctp_association_free(new_asoc); return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d5980 [SCTP]: Implement... |
765 |
} |
1da177e4c Linux-2.6.12-rc2 |
766 767 |
repl = sctp_make_cookie_ack(new_asoc, chunk); if (!repl) |
df7deeb54 [SCTP]: Cleanup n... |
768 |
goto nomem_init; |
1da177e4c Linux-2.6.12-rc2 |
769 770 771 772 773 774 775 776 777 778 |
/* RFC 2960 5.1 Normal Establishment of an Association * * D) IMPLEMENTATION NOTE: An implementation may choose to * send the Communication Up notification to the SCTP user * upon reception of a valid COOKIE ECHO chunk. */ ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, new_asoc->c.sinit_num_ostreams, new_asoc->c.sinit_max_instreams, |
a5a35e767 [SCTP]: Implement... |
779 |
NULL, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
780 781 |
if (!ev) goto nomem_ev; |
d808ad9ab [NET] SCTP: Fix w... |
782 |
/* Sockets API Draft Section 5.3.1.6 |
0f3fffd8a [SCTP]: Fix typo ... |
783 |
* When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4c Linux-2.6.12-rc2 |
784 |
* delivers this notification to inform the application that of the |
0f3fffd8a [SCTP]: Fix typo ... |
785 |
* peers requested adaptation layer. |
1da177e4c Linux-2.6.12-rc2 |
786 |
*/ |
0f3fffd8a [SCTP]: Fix typo ... |
787 788 |
if (new_asoc->peer.adaptation_ind) { ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, |
1da177e4c Linux-2.6.12-rc2 |
789 |
GFP_ATOMIC); |
df7deeb54 [SCTP]: Cleanup n... |
790 791 792 793 794 795 796 797 798 799 800 801 |
if (!ai_ev) goto nomem_aiev; } /* Add all the state machine commands now since we've created * everything. This way we don't introduce memory corruptions * during side-effect processing and correclty count established * associations. */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_ESTABLISHED)); |
b01a24078 sctp: Make the mi... |
802 803 |
SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); |
df7deeb54 [SCTP]: Cleanup n... |
804 |
sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46bd sctp: properly la... |
805 |
if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb54 [SCTP]: Cleanup n... |
806 807 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); |
df7deeb54 [SCTP]: Cleanup n... |
808 809 810 811 812 813 814 815 |
/* This will send the COOKIE ACK */ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); /* Queue the ASSOC_CHANGE event */ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); /* Send up the Adaptation Layer Indication event */ if (ai_ev) |
1da177e4c Linux-2.6.12-rc2 |
816 |
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb54 [SCTP]: Cleanup n... |
817 |
SCTP_ULPEVENT(ai_ev)); |
1da177e4c Linux-2.6.12-rc2 |
818 819 |
return SCTP_DISPOSITION_CONSUME; |
df7deeb54 [SCTP]: Cleanup n... |
820 821 |
nomem_aiev: sctp_ulpevent_free(ev); |
1da177e4c Linux-2.6.12-rc2 |
822 823 |
nomem_ev: sctp_chunk_free(repl); |
1da177e4c Linux-2.6.12-rc2 |
824 825 826 827 828 829 830 831 |
nomem_init: sctp_association_free(new_asoc); nomem: return SCTP_DISPOSITION_NOMEM; } /* * Respond to a normal COOKIE ACK chunk. |
b52effd26 sctp: fix cut and... |
832 |
* We are the side that is asking for an association. |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 |
* * RFC 2960 5.1 Normal Establishment of an Association * * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie * timer. It may also notify its ULP about the successful * establishment of the association with a Communication Up * notification (see Section 10). * * Verification Tag: * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
851 852 853 854 855 856 |
enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
857 858 859 860 861 |
{ struct sctp_chunk *chunk = arg; struct sctp_ulpevent *ev; if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
862 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
863 864 865 866 |
/* Verify that the chunk length for the COOKIE-ACK is OK. * If we don't do this, any bundled chunks may be junked. */ |
922dbc5be sctp: remove the ... |
867 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
868 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
869 870 871 872 873 874 875 876 |
commands); /* Reset init error count upon receipt of COOKIE-ACK, * to avoid problems with the managemement of this * counter in stale cookie situations when a transition back * from the COOKIE-ECHOED state to the COOKIE-WAIT * state is performed. */ |
3f7a87d2f [SCTP] sctp_conne... |
877 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
878 879 880 881 882 883 884 885 886 887 888 |
/* RFC 2960 5.1 Normal Establishment of an Association * * E) Upon reception of the COOKIE ACK, endpoint "A" will move * from the COOKIE-ECHOED state to the ESTABLISHED state, * stopping the T1-cookie timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_ESTABLISHED)); |
b01a24078 sctp: Make the mi... |
889 890 |
SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); |
1da177e4c Linux-2.6.12-rc2 |
891 |
sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46bd sctp: properly la... |
892 |
if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4c Linux-2.6.12-rc2 |
893 894 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); |
1da177e4c Linux-2.6.12-rc2 |
895 896 897 898 899 900 901 902 |
/* It may also notify its ULP about the successful * establishment of the association with a Communication Up * notification (see Section 10). */ ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, 0, asoc->c.sinit_num_ostreams, asoc->c.sinit_max_instreams, |
a5a35e767 [SCTP]: Implement... |
903 |
NULL, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
904 905 906 907 908 909 910 |
if (!ev) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8a [SCTP]: Fix typo ... |
911 |
* When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4c Linux-2.6.12-rc2 |
912 |
* delivers this notification to inform the application that of the |
0f3fffd8a [SCTP]: Fix typo ... |
913 |
* peers requested adaptation layer. |
1da177e4c Linux-2.6.12-rc2 |
914 |
*/ |
0f3fffd8a [SCTP]: Fix typo ... |
915 916 |
if (asoc->peer.adaptation_ind) { ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
917 918 919 920 921 922 923 924 925 926 927 928 929 |
if (!ev) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); } return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* Generate and sendout a heartbeat packet. */ |
172a1599b sctp: remove the ... |
930 931 932 933 934 935 |
static enum sctp_disposition sctp_sf_heartbeat( const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
936 937 938 |
{ struct sctp_transport *transport = (struct sctp_transport *) arg; struct sctp_chunk *reply; |
1da177e4c Linux-2.6.12-rc2 |
939 940 |
/* Send a heartbeat to our peer. */ |
92c73af58 sctp: make heartb... |
941 |
reply = sctp_make_heartbeat(asoc, transport); |
1da177e4c Linux-2.6.12-rc2 |
942 943 944 945 946 947 948 949 950 951 952 953 954 955 |
if (!reply) return SCTP_DISPOSITION_NOMEM; /* Set rto_pending indicating that an RTT measurement * is started with this heartbeat chunk. */ sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, SCTP_TRANSPORT(transport)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; } /* Generate a HEARTBEAT packet on the given transport. */ |
172a1599b sctp: remove the ... |
956 957 958 959 960 961 |
enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
962 963 |
{ struct sctp_transport *transport = (struct sctp_transport *) arg; |
b9f847868 sctp: Fix error c... |
964 |
if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c8738 [SCTP]: Set sk_er... |
965 966 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
967 968 |
/* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
969 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a24078 sctp: Make the mi... |
970 971 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 977 978 979 980 |
return SCTP_DISPOSITION_DELETE_TCB; } /* Section 3.3.5. * The Sender-specific Heartbeat Info field should normally include * information about the sender's current time when this HEARTBEAT * chunk is sent and the destination transport address to which this * HEARTBEAT is sent (see Section 8.3). */ |
52ccb8e90 [SCTP]: Update SC... |
981 |
if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4c Linux-2.6.12-rc2 |
982 983 984 985 |
if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, arg, commands)) return SCTP_DISPOSITION_NOMEM; |
245cba7e5 sctp: Remove usel... |
986 |
|
1da177e4c Linux-2.6.12-rc2 |
987 988 989 |
/* Set transport error counter and association error counter * when sending heartbeat. */ |
7e99013a5 sctp: Fix broken ... |
990 |
sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4c Linux-2.6.12-rc2 |
991 992 |
SCTP_TRANSPORT(transport)); } |
245cba7e5 sctp: Remove usel... |
993 994 |
sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, SCTP_TRANSPORT(transport)); |
1da177e4c Linux-2.6.12-rc2 |
995 996 |
sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, SCTP_TRANSPORT(transport)); |
d808ad9ab [NET] SCTP: Fix w... |
997 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
998 |
} |
7b9438de0 sctp: add stream ... |
999 |
/* resend asoc strreset_chunk. */ |
172a1599b sctp: remove the ... |
1000 1001 1002 1003 1004 1005 |
enum sctp_disposition sctp_sf_send_reconf(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
7b9438de0 sctp: add stream ... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 |
{ struct sctp_transport *transport = arg; if (asoc->overall_error_count >= asoc->max_retrans) { sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(SCTP_ERROR_NO_ERROR)); SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); return SCTP_DISPOSITION_DELETE_TCB; } sctp_chunk_hold(asoc->strreset_chunk); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asoc->strreset_chunk)); sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); return SCTP_DISPOSITION_CONSUME; } |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
/* * Process an heartbeat request. * * Section: 8.3 Path Heartbeat * The receiver of the HEARTBEAT should immediately respond with a * HEARTBEAT ACK that contains the Heartbeat Information field copied * from the received HEARTBEAT chunk. * * Verification Tag: 8.5 Verification Tag [Normal verification] * When receiving an SCTP packet, the endpoint MUST ensure that the * value in the Verification Tag field of the received SCTP packet * matches its own Tag. If the received Verification Tag value does not * match the receiver's own tag value, the receiver shall silently * discard the packet and shall not process it any further except for * those cases listed in Section 8.5.1 below. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
1051 1052 1053 1054 1055 |
enum sctp_disposition sctp_sf_beat_8_3(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1056 |
{ |
3c9187049 sctp: remove the ... |
1057 |
struct sctp_paramhdr *param_hdr; |
1da177e4c Linux-2.6.12-rc2 |
1058 1059 1060 1061 1062 |
struct sctp_chunk *chunk = arg; struct sctp_chunk *reply; size_t paylen = 0; if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
1063 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 |
/* Make sure that the HEARTBEAT chunk has a valid length. */ |
38c00f748 sctp: remove the ... |
1066 1067 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_heartbeat_chunk))) |
24cb81a6a sctp: Push struct... |
1068 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
1069 1070 1071 1072 1073 1074 |
commands); /* 8.3 The receiver of the HEARTBEAT should immediately * respond with a HEARTBEAT ACK that contains the Heartbeat * Information field copied from the received HEARTBEAT chunk. */ |
4d2dcdf4e sctp: remove the ... |
1075 |
chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c9187049 sctp: remove the ... |
1076 |
param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5be sctp: remove the ... |
1077 |
paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b9 sctp: verify leng... |
1078 1079 1080 1081 |
if (ntohs(param_hdr->length) > paylen) return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, param_hdr, commands); |
62b08083e [SCTP]: Fix panic... |
1082 1083 |
if (!pskb_pull(chunk->skb, paylen)) goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1084 |
|
06a31e2b9 sctp: verify leng... |
1085 |
reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 |
if (!reply) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Process the returning HEARTBEAT ACK. * * Section: 8.3 Path Heartbeat * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT * should clear the error counter of the destination transport * address to which the HEARTBEAT was sent, and mark the destination * transport address as active if it is not so marked. The endpoint may * optionally report to the upper layer when an inactive destination * address is marked as active due to the reception of the latest * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also * clear the association overall error count as well (as defined * in section 8.1). * * The receiver of the HEARTBEAT ACK should also perform an RTT * measurement for that destination transport address using the time * value carried in the HEARTBEAT ACK chunk. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
1124 1125 1126 1127 1128 1129 |
enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1130 |
{ |
edf903f83 sctp: remove the ... |
1131 |
struct sctp_sender_hb_info *hbinfo; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
1133 |
struct sctp_transport *link; |
1da177e4c Linux-2.6.12-rc2 |
1134 |
unsigned long max_interval; |
edf903f83 sctp: remove the ... |
1135 |
union sctp_addr from_addr; |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
1138 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 |
/* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ |
922dbc5be sctp: remove the ... |
1141 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f83 sctp: remove the ... |
1142 |
sizeof(*hbinfo))) |
24cb81a6a sctp: Push struct... |
1143 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
1144 |
commands); |
edf903f83 sctp: remove the ... |
1145 |
hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e4 [SCTP]: Validate ... |
1146 |
/* Make sure that the length of the parameter is what we expect */ |
edf903f83 sctp: remove the ... |
1147 |
if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e4 [SCTP]: Validate ... |
1148 |
return SCTP_DISPOSITION_DISCARD; |
a601266e4 [SCTP]: Validate ... |
1149 |
|
1da177e4c Linux-2.6.12-rc2 |
1150 |
from_addr = hbinfo->daddr; |
63de08f45 [SCTP]: Switch ad... |
1151 |
link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 |
/* This should never happen, but lets log it if so. */ |
3f7a87d2f [SCTP] sctp_conne... |
1154 1155 |
if (unlikely(!link)) { if (from_addr.sa.sa_family == AF_INET6) { |
e87cc4728 net: Convert net_... |
1156 1157 1158 1159 1160 |
net_warn_ratelimited("%s association %p could not find address %pI6 ", __func__, asoc, &from_addr.v6.sin6_addr); |
3f7a87d2f [SCTP] sctp_conne... |
1161 |
} else { |
e87cc4728 net: Convert net_... |
1162 1163 1164 1165 1166 |
net_warn_ratelimited("%s association %p could not find address %pI4 ", __func__, asoc, &from_addr.v4.sin_addr.s_addr); |
3f7a87d2f [SCTP] sctp_conne... |
1167 |
} |
1da177e4c Linux-2.6.12-rc2 |
1168 1169 |
return SCTP_DISPOSITION_DISCARD; } |
ad8fec172 [SCTP]: Verify al... |
1170 1171 1172 |
/* Validate the 64-bit random nonce. */ if (hbinfo->hb_nonce != link->hb_nonce) return SCTP_DISPOSITION_DISCARD; |
52ccb8e90 [SCTP]: Update SC... |
1173 |
max_interval = link->hbinterval + link->rto; |
1da177e4c Linux-2.6.12-rc2 |
1174 1175 1176 1177 |
/* Check if the timestamp looks valid. */ if (time_after(hbinfo->sent_at, jiffies) || time_after(jiffies, hbinfo->sent_at + max_interval)) { |
bb33381d0 net: sctp: rework... |
1178 1179 1180 |
pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " "for transport:%p ", __func__, link); |
1da177e4c Linux-2.6.12-rc2 |
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 |
return SCTP_DISPOSITION_DISCARD; } /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of * the HEARTBEAT should clear the error counter of the * destination transport address to which the HEARTBEAT was * sent and mark the destination transport address as active if * it is not so marked. */ sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); return SCTP_DISPOSITION_CONSUME; } /* Helper function to send out an abort for the restart * condition. */ |
2ce955035 sctp: Make the ct... |
1198 |
static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4c Linux-2.6.12-rc2 |
1199 |
struct sctp_chunk *init, |
a85bbeb22 sctp: remove the ... |
1200 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1201 |
{ |
172a1599b sctp: remove the ... |
1202 |
struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 |
union sctp_addr_param *addrparm; struct sctp_errhdr *errhdr; |
d8238d9da sctp: remove the ... |
1205 |
char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599b sctp: remove the ... |
1206 1207 1208 |
struct sctp_endpoint *ep; struct sctp_packet *pkt; int len; |
1da177e4c Linux-2.6.12-rc2 |
1209 1210 1211 1212 1213 1214 1215 1216 1217 |
/* Build the error on the stack. We are way to malloc crazy * throughout the code today. */ errhdr = (struct sctp_errhdr *)buffer; addrparm = (union sctp_addr_param *)errhdr->variable; /* Copy into a parm format. */ len = af->to_addr_param(ssa, addrparm); |
d8238d9da sctp: remove the ... |
1218 |
len += sizeof(*errhdr); |
1da177e4c Linux-2.6.12-rc2 |
1219 1220 1221 1222 1223 |
errhdr->cause = SCTP_ERROR_RESTART; errhdr->length = htons(len); /* Assign to the control socket. */ |
2ce955035 sctp: Make the ct... |
1224 |
ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4c Linux-2.6.12-rc2 |
1225 1226 1227 1228 |
/* Association is NULL since this may be a restart attack and we * want to send back the attacker's vtag. */ |
24cb81a6a sctp: Push struct... |
1229 |
pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 |
if (!pkt) goto out; sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); |
b01a24078 sctp: Make the mi... |
1234 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 |
/* Discard the rest of the inbound packet. */ sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); out: /* Even if there is no memory, treat as a failure so * the packet will get dropped. */ return 0; } |
123031c0e sctp: fix test fo... |
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 |
static bool list_has_sctp_addr(const struct list_head *list, union sctp_addr *ipaddr) { struct sctp_transport *addr; list_for_each_entry(addr, list, transports) { if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) return true; } return false; } |
1da177e4c Linux-2.6.12-rc2 |
1257 1258 1259 1260 1261 1262 |
/* A restart is occurring, check to make sure no new addresses * are being added as we may be under a takeover attack. */ static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, const struct sctp_association *asoc, struct sctp_chunk *init, |
a85bbeb22 sctp: remove the ... |
1263 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1264 |
{ |
2ce955035 sctp: Make the ct... |
1265 |
struct net *net = sock_net(new_asoc->base.sk); |
123031c0e sctp: fix test fo... |
1266 1267 |
struct sctp_transport *new_addr; int ret = 1; |
1da177e4c Linux-2.6.12-rc2 |
1268 |
|
123031c0e sctp: fix test fo... |
1269 |
/* Implementor's Guide - Section 5.2.2 |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 |
* ... * Before responding the endpoint MUST check to see if the * unexpected INIT adds new addresses to the association. If new * addresses are added to the association, the endpoint MUST respond * with an ABORT.. */ /* Search through all current addresses and make sure * we aren't adding any new ones. */ |
9dbc15f05 [SCTP]: "list_for... |
1280 |
list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0e sctp: fix test fo... |
1281 1282 1283 |
transports) { if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, &new_addr->ipaddr)) { |
2ce955035 sctp: Make the ct... |
1284 |
sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0e sctp: fix test fo... |
1285 1286 |
commands); ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1287 |
break; |
123031c0e sctp: fix test fo... |
1288 |
} |
1da177e4c Linux-2.6.12-rc2 |
1289 1290 1291 |
} /* Return success if all addresses were found. */ |
123031c0e sctp: fix test fo... |
1292 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
} /* Populate the verification/tie tags based on overlapping INIT * scenario. * * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. */ static void sctp_tietags_populate(struct sctp_association *new_asoc, const struct sctp_association *asoc) { switch (asoc->state) { /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ case SCTP_STATE_COOKIE_WAIT: new_asoc->c.my_vtag = asoc->c.my_vtag; new_asoc->c.my_ttag = asoc->c.my_vtag; new_asoc->c.peer_ttag = 0; break; case SCTP_STATE_COOKIE_ECHOED: new_asoc->c.my_vtag = asoc->c.my_vtag; new_asoc->c.my_ttag = asoc->c.my_vtag; new_asoc->c.peer_ttag = asoc->c.peer_vtag; break; /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, * COOKIE-WAIT and SHUTDOWN-ACK-SENT */ default: new_asoc->c.my_ttag = asoc->c.my_vtag; new_asoc->c.peer_ttag = asoc->c.peer_vtag; break; |
3ff50b799 [NET]: cleanup ex... |
1326 |
} |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 |
/* Other parameters for the endpoint SHOULD be copied from the * existing parameters of the association (e.g. number of * outbound streams) into the INIT ACK and cookie. */ new_asoc->rwnd = asoc->rwnd; new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; new_asoc->c.initial_tsn = asoc->c.initial_tsn; } /* * Compare vtag/tietag values to determine unexpected COOKIE-ECHO * handling action. * * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. * * Returns value representing action to be taken. These action values * correspond to Action/Description values in RFC 2960, Table 2. */ static char sctp_tietags_compare(struct sctp_association *new_asoc, const struct sctp_association *asoc) { /* In this case, the peer may have restarted. */ if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && (asoc->c.my_vtag == new_asoc->c.my_ttag) && (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) return 'A'; /* Collision case B. */ if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || (0 == asoc->c.peer_vtag))) { return 'B'; } /* Collision case D. */ if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) return 'D'; /* Collision case C. */ if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && (0 == new_asoc->c.my_ttag) && (0 == new_asoc->c.peer_ttag)) return 'C'; /* No match to any of the special cases; discard this packet. */ return 'E'; } /* Common helper routine for both duplicate and simulataneous INIT * chunk handling. */ |
172a1599b sctp: remove the ... |
1383 1384 1385 1386 1387 1388 1389 |
static enum sctp_disposition sctp_sf_do_unexpected_init( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1390 |
{ |
62e6b7e4e sctp: remove the ... |
1391 1392 |
struct sctp_chunk *chunk = arg, *repl, *err_chunk; struct sctp_unrecognized_param *unk_param; |
1da177e4c Linux-2.6.12-rc2 |
1393 |
struct sctp_association *new_asoc; |
172a1599b sctp: remove the ... |
1394 |
enum sctp_disposition retval; |
1da177e4c Linux-2.6.12-rc2 |
1395 |
struct sctp_packet *packet; |
1da177e4c Linux-2.6.12-rc2 |
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 |
int len; /* 6.10 Bundling * An endpoint MUST NOT bundle INIT, INIT ACK or * SHUTDOWN COMPLETE with any other chunks. * * IG Section 2.11.2 * Furthermore, we require that the receiver of an INIT chunk MUST * enforce these rules by silently discarding an arriving packet * with an INIT chunk that is bundled with other chunks. */ if (!chunk->singleton) |
24cb81a6a sctp: Push struct... |
1408 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1409 1410 |
/* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9ab [NET] SCTP: Fix w... |
1411 |
* Tag. |
1da177e4c Linux-2.6.12-rc2 |
1412 1413 |
*/ if (chunk->sctp_hdr->vtag != 0) |
24cb81a6a sctp: Push struct... |
1414 |
return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1415 1416 1417 1418 1419 |
/* Make sure that the INIT chunk has a valid length. * In this case, we generate a protocol violation since we have * an association established. */ |
01a992bea sctp: remove the ... |
1420 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6a sctp: Push struct... |
1421 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 |
commands); /* Grab the INIT header. */ |
4ae70c084 sctp: remove the ... |
1424 |
chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4c Linux-2.6.12-rc2 |
1425 1426 |
/* Tag the variable length parameters. */ |
4ae70c084 sctp: remove the ... |
1427 |
chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4c Linux-2.6.12-rc2 |
1428 1429 1430 |
/* Verify the INIT chunk before processing it. */ err_chunk = NULL; |
b14878ccb net: sctp: cache ... |
1431 |
if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992bea sctp: remove the ... |
1432 |
(struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4c Linux-2.6.12-rc2 |
1433 1434 1435 1436 1437 |
&err_chunk)) { /* This chunk contains fatal error. It is to be discarded. * Send an ABORT, with causes if there is any. */ if (err_chunk) { |
24cb81a6a sctp: Push struct... |
1438 |
packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4c Linux-2.6.12-rc2 |
1439 |
(__u8 *)(err_chunk->chunk_hdr) + |
922dbc5be sctp: remove the ... |
1440 |
sizeof(struct sctp_chunkhdr), |
1da177e4c Linux-2.6.12-rc2 |
1441 |
ntohs(err_chunk->chunk_hdr->length) - |
922dbc5be sctp: remove the ... |
1442 |
sizeof(struct sctp_chunkhdr)); |
1da177e4c Linux-2.6.12-rc2 |
1443 1444 1445 1446 |
if (packet) { sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
24cb81a6a sctp: Push struct... |
1447 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
1448 1449 1450 1451 1452 1453 |
retval = SCTP_DISPOSITION_CONSUME; } else { retval = SCTP_DISPOSITION_NOMEM; } goto cleanup; } else { |
24cb81a6a sctp: Push struct... |
1454 |
return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 |
commands); } } /* * Other parameters for the endpoint SHOULD be copied from the * existing parameters of the association (e.g. number of * outbound streams) into the INIT ACK and cookie. * FIXME: We are copying parameters from the endpoint not the * association. */ new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); if (!new_asoc) goto nomem; |
409b95aff sctp: Set source ... |
1469 1470 1471 |
if (sctp_assoc_set_bind_addr_from_ep(new_asoc, sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1472 1473 1474 1475 |
/* In the outbound INIT ACK the endpoint MUST copy its current * Verification Tag and Peers Verification tag into a reserved * place (local tie-tag and per tie-tag) within the state cookie. */ |
de6becdc0 sctp: fix to chec... |
1476 |
if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992bea sctp: remove the ... |
1477 |
(struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb54 [SCTP]: Cleanup n... |
1478 1479 |
GFP_ATOMIC)) goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 |
/* Make sure no new addresses are being added during the * restart. Do not do this check for COOKIE-WAIT state, * since there are no peer addresses to check against. * Upon return an ABORT will have been sent if needed. */ if (!sctp_state(asoc, COOKIE_WAIT)) { if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) { retval = SCTP_DISPOSITION_CONSUME; |
df7deeb54 [SCTP]: Cleanup n... |
1490 |
goto nomem_retval; |
1da177e4c Linux-2.6.12-rc2 |
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 |
} } sctp_tietags_populate(new_asoc, asoc); /* B) "Z" shall respond immediately with an INIT ACK chunk. */ /* If there are errors need to be reported for unknown parameters, * make sure to reserve enough room in the INIT ACK for them. */ len = 0; if (err_chunk) { len = ntohs(err_chunk->chunk_hdr->length) - |
922dbc5be sctp: remove the ... |
1504 |
sizeof(struct sctp_chunkhdr); |
1da177e4c Linux-2.6.12-rc2 |
1505 |
} |
1da177e4c Linux-2.6.12-rc2 |
1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 |
repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); if (!repl) goto nomem; /* If there are errors need to be reported for unknown parameters, * include them in the outgoing INIT ACK as "Unrecognized parameter" * parameter. */ if (err_chunk) { /* Get the "Unrecognized parameter" parameter(s) out of the * ERROR chunk generated by sctp_verify_init(). Since the * error cause code for "unknown parameter" and the * "Unrecognized parameter" type is the same, we can * construct the parameters in INIT ACK by copying the * ERROR causes over. */ |
62e6b7e4e sctp: remove the ... |
1522 |
unk_param = (struct sctp_unrecognized_param *) |
1da177e4c Linux-2.6.12-rc2 |
1523 |
((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5be sctp: remove the ... |
1524 |
sizeof(struct sctp_chunkhdr)); |
1da177e4c Linux-2.6.12-rc2 |
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 |
/* Replace the cause code with the "Unrecognized parameter" * parameter type. */ sctp_addto_chunk(repl, len, unk_param); } sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); /* * Note: After sending out INIT ACK with the State Cookie parameter, * "Z" MUST NOT allocate any resources for this new association. * Otherwise, "Z" will be vulnerable to resource attacks. */ sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); retval = SCTP_DISPOSITION_CONSUME; |
df7deeb54 [SCTP]: Cleanup n... |
1541 1542 1543 1544 1545 1546 1547 |
return retval; nomem: retval = SCTP_DISPOSITION_NOMEM; nomem_retval: if (new_asoc) sctp_association_free(new_asoc); |
1da177e4c Linux-2.6.12-rc2 |
1548 1549 1550 1551 |
cleanup: if (err_chunk) sctp_chunk_free(err_chunk); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1552 1553 1554 |
} /* |
25985edce Fix common misspe... |
1555 |
* Handle simultaneous INIT. |
1da177e4c Linux-2.6.12-rc2 |
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 |
* This means we started an INIT and then we got an INIT request from * our peer. * * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) * This usually indicates an initialization collision, i.e., each * endpoint is attempting, at about the same time, to establish an * association with the other endpoint. * * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an * endpoint MUST respond with an INIT ACK using the same parameters it * sent in its original INIT chunk (including its Verification Tag, * unchanged). These original parameters are combined with those from the * newly received INIT chunk. The endpoint shall also generate a State * Cookie with the INIT ACK. The endpoint uses the parameters sent in its * INIT to calculate the State Cookie. * * After that, the endpoint MUST NOT change its state, the T1-init * timer shall be left running and the corresponding TCB MUST NOT be * destroyed. The normal procedures for handling State Cookies when * a TCB exists will resolve the duplicate INITs to a single association. * * For an endpoint that is in the COOKIE-ECHOED state it MUST populate * its Tie-Tags with the Tag information of itself and its peer (see * section 5.2.2 for a description of the Tie-Tags). * * Verification Tag: Not explicit, but an INIT can not have a valid * verification tag, so we skip the check. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
1592 1593 1594 1595 1596 1597 1598 |
enum sctp_disposition sctp_sf_do_5_2_1_siminit( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1599 1600 1601 1602 |
{ /* Call helper to do the real work for both simulataneous and * duplicate INIT chunk handling. */ |
24cb81a6a sctp: Push struct... |
1603 |
return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 |
} /* * Handle duplicated INIT messages. These are usually delayed * restransmissions. * * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, * COOKIE-ECHOED and COOKIE-WAIT * * Unless otherwise stated, upon reception of an unexpected INIT for * this association, the endpoint shall generate an INIT ACK with a * State Cookie. In the outbound INIT ACK the endpoint MUST copy its * current Verification Tag and peer's Verification Tag into a reserved * place within the state cookie. We shall refer to these locations as * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet * containing this INIT ACK MUST carry a Verification Tag value equal to * the Initiation Tag found in the unexpected INIT. And the INIT ACK * MUST contain a new Initiation Tag (randomly generated see Section * 5.3.1). Other parameters for the endpoint SHOULD be copied from the * existing parameters of the association (e.g. number of outbound * streams) into the INIT ACK and cookie. * * After sending out the INIT ACK, the endpoint shall take no further * actions, i.e., the existing association, including its current state, * and the corresponding TCB MUST NOT be changed. * * Note: Only when a TCB exists and the association is not in a COOKIE- * WAIT state are the Tie-Tags populated. For a normal association INIT * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be * set to 0 (indicating that no previous TCB existed). The INIT ACK and * State Cookie are populated as specified in section 5.2.1. * * Verification Tag: Not specified, but an INIT has no way of knowing * what the verification tag could be, so we ignore it. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
1647 1648 |
enum sctp_disposition sctp_sf_do_5_2_2_dupinit( struct net *net, |
24cb81a6a sctp: Push struct... |
1649 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1650 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
1651 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
1652 |
void *arg, |
a85bbeb22 sctp: remove the ... |
1653 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1654 1655 1656 1657 |
{ /* Call helper to do the real work for both simulataneous and * duplicate INIT chunk handling. */ |
24cb81a6a sctp: Push struct... |
1658 |
return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
1659 |
} |
610ab73ac [SCTP]: Correctly... |
1660 1661 1662 1663 1664 1665 1666 1667 1668 |
/* * Unexpected INIT-ACK handler. * * Section 5.2.3 * If an INIT ACK received by an endpoint in any state other than the * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. * An unexpected INIT ACK usually indicates the processing of an old or * duplicated INIT chunk. */ |
172a1599b sctp: remove the ... |
1669 1670 1671 1672 1673 1674 1675 |
enum sctp_disposition sctp_sf_do_5_2_3_initack( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
610ab73ac [SCTP]: Correctly... |
1676 1677 1678 1679 |
{ /* Per the above section, we'll discard the chunk if we have an * endpoint. If this is an OOTB INIT-ACK, treat it as such. */ |
2ce955035 sctp: Make the ct... |
1680 |
if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6a sctp: Push struct... |
1681 |
return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73ac [SCTP]: Correctly... |
1682 |
else |
24cb81a6a sctp: Push struct... |
1683 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73ac [SCTP]: Correctly... |
1684 |
} |
1da177e4c Linux-2.6.12-rc2 |
1685 1686 1687 1688 1689 1690 |
/* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') * * Section 5.2.4 * A) In this case, the peer may have restarted. */ |
172a1599b sctp: remove the ... |
1691 1692 |
static enum sctp_disposition sctp_sf_do_dupcook_a( struct net *net, |
24cb81a6a sctp: Push struct... |
1693 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1694 1695 |
const struct sctp_association *asoc, struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
1696 |
struct sctp_cmd_seq *commands, |
1da177e4c Linux-2.6.12-rc2 |
1697 1698 |
struct sctp_association *new_asoc) { |
01a992bea sctp: remove the ... |
1699 |
struct sctp_init_chunk *peer_init; |
172a1599b sctp: remove the ... |
1700 |
enum sctp_disposition disposition; |
1da177e4c Linux-2.6.12-rc2 |
1701 1702 1703 |
struct sctp_ulpevent *ev; struct sctp_chunk *repl; struct sctp_chunk *err; |
1da177e4c Linux-2.6.12-rc2 |
1704 1705 1706 1707 1708 |
/* new_asoc is a brand-new association, so these are not yet * side effects--it is safe to run them here. */ peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; |
de6becdc0 sctp: fix to chec... |
1709 |
if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4c Linux-2.6.12-rc2 |
1710 1711 |
GFP_ATOMIC)) goto nomem; |
3b54f1fd8 sctp: delay the a... |
1712 1713 |
if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) return SCTP_DISPOSITION_DISCARD; |
1da177e4c Linux-2.6.12-rc2 |
1714 1715 1716 1717 |
/* Make sure no new addresses are being added during the * restart. Though this is a pretty complicated attack * since you'd have to get inside the cookie. */ |
3b54f1fd8 sctp: delay the a... |
1718 |
if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) |
1da177e4c Linux-2.6.12-rc2 |
1719 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
1720 1721 1722 1723 1724 1725 1726 1727 |
/* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes * the peer has restarted (Action A), it MUST NOT setup a new * association but instead resend the SHUTDOWN ACK and send an ERROR * chunk with a "Cookie Received while Shutting Down" error cause to * its peer. */ if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { |
24cb81a6a sctp: Push struct... |
1728 |
disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4c Linux-2.6.12-rc2 |
1729 1730 1731 1732 1733 1734 1735 |
SCTP_ST_CHUNK(chunk->chunk_hdr->type), chunk, commands); if (SCTP_DISPOSITION_NOMEM == disposition) goto nomem; err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_COOKIE_IN_SHUTDOWN, |
6383cfb3e sctp: Fix malform... |
1736 |
NULL, 0, 0); |
1da177e4c Linux-2.6.12-rc2 |
1737 1738 1739 1740 1741 1742 |
if (err) sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err)); return SCTP_DISPOSITION_CONSUME; } |
a000c01e6 sctp: stop pendin... |
1743 1744 |
/* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked * data. Consider the optional choice of resending of this data. |
1da177e4c Linux-2.6.12-rc2 |
1745 |
*/ |
a000c01e6 sctp: stop pendin... |
1746 1747 1748 |
sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
1da177e4c Linux-2.6.12-rc2 |
1749 |
sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
a000c01e6 sctp: stop pendin... |
1750 1751 1752 1753 1754 1755 |
/* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue * and ASCONF-ACK cache. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
1756 1757 1758 |
repl = sctp_make_cookie_ack(new_asoc, chunk); if (!repl) goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1759 1760 1761 1762 |
/* Report association restart to upper layer. */ ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, new_asoc->c.sinit_num_ostreams, new_asoc->c.sinit_max_instreams, |
a5a35e767 [SCTP]: Implement... |
1763 |
NULL, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
1764 1765 |
if (!ev) goto nomem_ev; |
df7deeb54 [SCTP]: Cleanup n... |
1766 1767 |
/* Update the content of current association. */ sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); |
1da177e4c Linux-2.6.12-rc2 |
1768 |
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
bdf6fa52f sctp: handle asso... |
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 |
if (sctp_state(asoc, SHUTDOWN_PENDING) && (sctp_sstate(asoc->base.sk, CLOSING) || sock_flag(asoc->base.sk, SOCK_DEAD))) { /* if were currently in SHUTDOWN_PENDING, but the socket * has been closed by user, don't transition to ESTABLISHED. * Instead trigger SHUTDOWN bundled with COOKIE_ACK. */ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, SCTP_ST_CHUNK(0), NULL, commands); } else { sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_ESTABLISHED)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); } |
1da177e4c Linux-2.6.12-rc2 |
1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 |
return SCTP_DISPOSITION_CONSUME; nomem_ev: sctp_chunk_free(repl); nomem: return SCTP_DISPOSITION_NOMEM; } /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') * * Section 5.2.4 * B) In this case, both sides may be attempting to start an association * at about the same time but the peer endpoint started its INIT * after responding to the local endpoint's INIT */ /* This case represents an initialization collision. */ |
172a1599b sctp: remove the ... |
1801 1802 |
static enum sctp_disposition sctp_sf_do_dupcook_b( struct net *net, |
24cb81a6a sctp: Push struct... |
1803 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1804 1805 |
const struct sctp_association *asoc, struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
1806 |
struct sctp_cmd_seq *commands, |
1da177e4c Linux-2.6.12-rc2 |
1807 1808 |
struct sctp_association *new_asoc) { |
01a992bea sctp: remove the ... |
1809 |
struct sctp_init_chunk *peer_init; |
1da177e4c Linux-2.6.12-rc2 |
1810 1811 1812 1813 1814 1815 |
struct sctp_chunk *repl; /* new_asoc is a brand-new association, so these are not yet * side effects--it is safe to run them here. */ peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; |
de6becdc0 sctp: fix to chec... |
1816 |
if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4c Linux-2.6.12-rc2 |
1817 1818 |
GFP_ATOMIC)) goto nomem; |
3b54f1fd8 sctp: delay the a... |
1819 1820 |
if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) return SCTP_DISPOSITION_DISCARD; |
1da177e4c Linux-2.6.12-rc2 |
1821 1822 1823 1824 |
/* Update the content of current association. */ sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_ESTABLISHED)); |
24cb81a6a sctp: Push struct... |
1825 |
SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
1826 1827 1828 1829 1830 1831 1832 |
sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); repl = sctp_make_cookie_ack(new_asoc, chunk); if (!repl) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
1da177e4c Linux-2.6.12-rc2 |
1833 1834 1835 1836 1837 1838 |
/* RFC 2960 5.1 Normal Establishment of an Association * * D) IMPLEMENTATION NOTE: An implementation may choose to * send the Communication Up notification to the SCTP user * upon reception of a valid COOKIE ECHO chunk. |
07d939677 [SCTP]: Set assoc... |
1839 1840 1841 1842 1843 |
* * Sadly, this needs to be implemented as a side-effect, because * we are not guaranteed to have set the association id of the real * association and so these notifications need to be delayed until * the association id is allocated. |
1da177e4c Linux-2.6.12-rc2 |
1844 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1845 |
|
07d939677 [SCTP]: Set assoc... |
1846 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4c Linux-2.6.12-rc2 |
1847 1848 |
/* Sockets API Draft Section 5.3.1.6 |
0f3fffd8a [SCTP]: Fix typo ... |
1849 |
* When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4c Linux-2.6.12-rc2 |
1850 |
* delivers this notification to inform the application that of the |
0f3fffd8a [SCTP]: Fix typo ... |
1851 |
* peers requested adaptation layer. |
07d939677 [SCTP]: Set assoc... |
1852 1853 1854 |
* * This also needs to be done as a side effect for the same reason as * above. |
1da177e4c Linux-2.6.12-rc2 |
1855 |
*/ |
07d939677 [SCTP]: Set assoc... |
1856 1857 |
if (asoc->peer.adaptation_ind) sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
1858 1859 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 |
nomem: return SCTP_DISPOSITION_NOMEM; } /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') * * Section 5.2.4 * C) In this case, the local endpoint's cookie has arrived late. * Before it arrived, the local endpoint sent an INIT and received an * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag * but a new tag of its own. */ /* This case represents an initialization collision. */ |
172a1599b sctp: remove the ... |
1873 1874 |
static enum sctp_disposition sctp_sf_do_dupcook_c( struct net *net, |
24cb81a6a sctp: Push struct... |
1875 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1876 1877 |
const struct sctp_association *asoc, struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
1878 |
struct sctp_cmd_seq *commands, |
1da177e4c Linux-2.6.12-rc2 |
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 |
struct sctp_association *new_asoc) { /* The cookie should be silently discarded. * The endpoint SHOULD NOT change states and should leave * any timers running. */ return SCTP_DISPOSITION_DISCARD; } /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') * * Section 5.2.4 * * D) When both local and remote tags match the endpoint should always * enter the ESTABLISHED state, if it has not already done so. */ /* This case represents an initialization collision. */ |
172a1599b sctp: remove the ... |
1896 1897 |
static enum sctp_disposition sctp_sf_do_dupcook_d( struct net *net, |
24cb81a6a sctp: Push struct... |
1898 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1899 1900 |
const struct sctp_association *asoc, struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
1901 |
struct sctp_cmd_seq *commands, |
1da177e4c Linux-2.6.12-rc2 |
1902 1903 |
struct sctp_association *new_asoc) { |
df7deeb54 [SCTP]: Cleanup n... |
1904 |
struct sctp_ulpevent *ev = NULL, *ai_ev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1905 1906 1907 1908 |
struct sctp_chunk *repl; /* Clarification from Implementor's Guide: * D) When both local and remote tags match the endpoint should |
d808ad9ab [NET] SCTP: Fix w... |
1909 1910 1911 |
* enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. * It should stop any cookie timer that may be running and send * a COOKIE ACK. |
1da177e4c Linux-2.6.12-rc2 |
1912 |
*/ |
3b54f1fd8 sctp: delay the a... |
1913 1914 |
if (!sctp_auth_chunk_verify(net, chunk, asoc)) return SCTP_DISPOSITION_DISCARD; |
1da177e4c Linux-2.6.12-rc2 |
1915 1916 1917 1918 1919 1920 |
/* Don't accidentally move back into established state. */ if (asoc->state < SCTP_STATE_ESTABLISHED) { sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_ESTABLISHED)); |
24cb81a6a sctp: Push struct... |
1921 |
SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 |
sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); /* RFC 2960 5.1 Normal Establishment of an Association * * D) IMPLEMENTATION NOTE: An implementation may choose * to send the Communication Up notification to the * SCTP user upon reception of a valid COOKIE * ECHO chunk. */ |
df7deeb54 [SCTP]: Cleanup n... |
1932 |
ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4c Linux-2.6.12-rc2 |
1933 |
SCTP_COMM_UP, 0, |
df7deeb54 [SCTP]: Cleanup n... |
1934 1935 |
asoc->c.sinit_num_ostreams, asoc->c.sinit_max_instreams, |
9cbcbf4e0 [NET] SCTP: Fix w... |
1936 |
NULL, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
1937 1938 |
if (!ev) goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1939 1940 |
/* Sockets API Draft Section 5.3.1.6 |
0f3fffd8a [SCTP]: Fix typo ... |
1941 |
* When a peer sends a Adaptation Layer Indication parameter, |
1da177e4c Linux-2.6.12-rc2 |
1942 |
* SCTP delivers this notification to inform the application |
0f3fffd8a [SCTP]: Fix typo ... |
1943 |
* that of the peers requested adaptation layer. |
1da177e4c Linux-2.6.12-rc2 |
1944 |
*/ |
0f3fffd8a [SCTP]: Fix typo ... |
1945 1946 |
if (asoc->peer.adaptation_ind) { ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, |
1da177e4c Linux-2.6.12-rc2 |
1947 |
GFP_ATOMIC); |
df7deeb54 [SCTP]: Cleanup n... |
1948 |
if (!ai_ev) |
1da177e4c Linux-2.6.12-rc2 |
1949 |
goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
1950 1951 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1952 |
|
bf2f3bae3 sctp: use the old... |
1953 |
repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4c Linux-2.6.12-rc2 |
1954 1955 |
if (!repl) goto nomem; |
2e3216cd5 sctp: Follow secu... |
1956 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
df7deeb54 [SCTP]: Cleanup n... |
1957 1958 1959 1960 1961 1962 |
if (ev) sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); if (ai_ev) sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ai_ev)); |
1da177e4c Linux-2.6.12-rc2 |
1963 1964 1965 |
return SCTP_DISPOSITION_CONSUME; nomem: |
df7deeb54 [SCTP]: Cleanup n... |
1966 1967 |
if (ai_ev) sctp_ulpevent_free(ai_ev); |
1da177e4c Linux-2.6.12-rc2 |
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 |
if (ev) sctp_ulpevent_free(ev); return SCTP_DISPOSITION_NOMEM; } /* * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying * chunk was retransmitted and then delayed in the network. * * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists * * Verification Tag: None. Do cookie validation. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
1989 1990 |
enum sctp_disposition sctp_sf_do_5_2_4_dupcook( struct net *net, |
24cb81a6a sctp: Push struct... |
1991 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
1992 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
1993 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
1994 |
void *arg, |
a85bbeb22 sctp: remove the ... |
1995 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
1996 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1997 |
struct sctp_association *new_asoc; |
172a1599b sctp: remove the ... |
1998 1999 2000 |
struct sctp_chunk *chunk = arg; enum sctp_disposition retval; struct sctp_chunk *err_chk_p; |
1da177e4c Linux-2.6.12-rc2 |
2001 2002 |
int error = 0; char action; |
1da177e4c Linux-2.6.12-rc2 |
2003 2004 2005 2006 2007 2008 |
/* Make sure that the chunk has a valid length from the protocol * perspective. In this case check to make sure we have at least * enough for the chunk header. Cookie length verification is * done later. */ |
922dbc5be sctp: remove the ... |
2009 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
2010 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2011 2012 2013 2014 2015 |
commands); /* "Decode" the chunk. We have no optional parameters so we * are in good shape. */ |
d808ad9ab [NET] SCTP: Fix w... |
2016 |
chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083e [SCTP]: Fix panic... |
2017 |
if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5be sctp: remove the ... |
2018 |
sizeof(struct sctp_chunkhdr))) |
62b08083e [SCTP]: Fix panic... |
2019 |
goto nomem; |
1da177e4c Linux-2.6.12-rc2 |
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 |
/* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie * of a duplicate COOKIE ECHO match the Verification Tags of the * current association, consider the State Cookie valid even if * the lifespan is exceeded. */ new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, &err_chk_p); /* FIXME: * If the re-build failed, what is the proper error path * from here? * * [We should abort the association. --piggy] */ if (!new_asoc) { /* FIXME: Several errors are possible. A bad cookie should * be silently discarded, but think about logging it too. */ switch (error) { case -SCTP_IERROR_NOMEM: goto nomem; case -SCTP_IERROR_STALE_COOKIE: |
24cb81a6a sctp: Push struct... |
2044 |
sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
2045 |
err_chk_p); |
24cb81a6a sctp: Push struct... |
2046 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2047 2048 |
case -SCTP_IERROR_BAD_SIG: default: |
24cb81a6a sctp: Push struct... |
2049 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b799 [NET]: cleanup ex... |
2050 |
} |
1da177e4c Linux-2.6.12-rc2 |
2051 |
} |
7e0629776 sctp: set new_aso... |
2052 2053 |
/* Set temp so that it won't be added into hashtable */ new_asoc->temp = 1; |
1da177e4c Linux-2.6.12-rc2 |
2054 2055 2056 2057 2058 2059 2060 |
/* Compare the tie_tag in cookie with the verification tag of * current association. */ action = sctp_tietags_compare(new_asoc, asoc); switch (action) { case 'A': /* Association restart. */ |
24cb81a6a sctp: Push struct... |
2061 |
retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
2062 2063 2064 2065 |
new_asoc); break; case 'B': /* Collision case B. */ |
24cb81a6a sctp: Push struct... |
2066 |
retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
2067 2068 2069 2070 |
new_asoc); break; case 'C': /* Collision case C. */ |
24cb81a6a sctp: Push struct... |
2071 |
retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
2072 2073 2074 2075 |
new_asoc); break; case 'D': /* Collision case D. */ |
24cb81a6a sctp: Push struct... |
2076 |
retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4c Linux-2.6.12-rc2 |
2077 2078 2079 2080 |
new_asoc); break; default: /* Discard packet for all others. */ |
24cb81a6a sctp: Push struct... |
2081 |
retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2082 |
break; |
3ff50b799 [NET]: cleanup ex... |
2083 |
} |
1da177e4c Linux-2.6.12-rc2 |
2084 2085 |
/* Delete the tempory new association. */ |
f28156335 sctp: Use correct... |
2086 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4c Linux-2.6.12-rc2 |
2087 |
sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
d5ccd4966 sctp: deal with m... |
2088 2089 2090 2091 2092 |
/* Restore association pointer to provide SCTP command interpeter * with a valid context in case it needs to manipulate * the queues */ sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC((struct sctp_association *)asoc)); |
1da177e4c Linux-2.6.12-rc2 |
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 |
return retval; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Process an ABORT. (SHUTDOWN-PENDING state) * * See sctp_sf_do_9_1_abort(). */ |
172a1599b sctp: remove the ... |
2104 2105 2106 2107 2108 2109 2110 |
enum sctp_disposition sctp_sf_shutdown_pending_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2111 2112 2113 2114 |
{ struct sctp_chunk *chunk = arg; if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2115 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2116 2117 2118 2119 2120 2121 2122 |
/* Make sure that the ABORT chunk has a valid length. * Since this is an ABORT chunk, we have to discard it * because of the following text: * RFC 2960, Section 3.3.7 * If an endpoint receives an ABORT with a format error or for an * association that doesn't exist, it MUST silently discard it. |
25985edce Fix common misspe... |
2123 |
* Because the length is "invalid", we can't really discard just |
1da177e4c Linux-2.6.12-rc2 |
2124 2125 2126 |
* as we do not know its true length. So, to be safe, discard the * packet. */ |
441ae65ae sctp: remove the ... |
2127 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6a sctp: Push struct... |
2128 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2129 |
|
75205f478 [SCTP]: Implement... |
2130 2131 2132 2133 2134 2135 2136 |
/* ADD-IP: Special case for ABORT chunks * F4) One special consideration is that ABORT Chunks arriving * destined to the IP address being deleted MUST be * ignored (see Section 5.3.1 for further details). */ if (SCTP_ADDR_DEL == sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) |
24cb81a6a sctp: Push struct... |
2137 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f478 [SCTP]: Implement... |
2138 |
|
24cb81a6a sctp: Push struct... |
2139 |
return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2140 2141 2142 2143 2144 2145 2146 |
} /* * Process an ABORT. (SHUTDOWN-SENT state) * * See sctp_sf_do_9_1_abort(). */ |
172a1599b sctp: remove the ... |
2147 2148 |
enum sctp_disposition sctp_sf_shutdown_sent_abort( struct net *net, |
24cb81a6a sctp: Push struct... |
2149 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
2150 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
2151 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
2152 |
void *arg, |
a85bbeb22 sctp: remove the ... |
2153 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2154 2155 2156 2157 |
{ struct sctp_chunk *chunk = arg; if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2158 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2159 2160 2161 2162 2163 2164 2165 |
/* Make sure that the ABORT chunk has a valid length. * Since this is an ABORT chunk, we have to discard it * because of the following text: * RFC 2960, Section 3.3.7 * If an endpoint receives an ABORT with a format error or for an * association that doesn't exist, it MUST silently discard it. |
25985edce Fix common misspe... |
2166 |
* Because the length is "invalid", we can't really discard just |
1da177e4c Linux-2.6.12-rc2 |
2167 2168 2169 |
* as we do not know its true length. So, to be safe, discard the * packet. */ |
441ae65ae sctp: remove the ... |
2170 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6a sctp: Push struct... |
2171 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2172 |
|
75205f478 [SCTP]: Implement... |
2173 2174 2175 2176 2177 2178 2179 |
/* ADD-IP: Special case for ABORT chunks * F4) One special consideration is that ABORT Chunks arriving * destined to the IP address being deleted MUST be * ignored (see Section 5.3.1 for further details). */ if (SCTP_ADDR_DEL == sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) |
24cb81a6a sctp: Push struct... |
2180 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f478 [SCTP]: Implement... |
2181 |
|
1da177e4c Linux-2.6.12-rc2 |
2182 2183 2184 2185 2186 2187 2188 |
/* Stop the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); /* Stop the T5-shutdown guard timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
24cb81a6a sctp: Push struct... |
2189 |
return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2190 2191 2192 2193 2194 2195 2196 |
} /* * Process an ABORT. (SHUTDOWN-ACK-SENT state) * * See sctp_sf_do_9_1_abort(). */ |
172a1599b sctp: remove the ... |
2197 2198 2199 2200 2201 2202 2203 |
enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2204 2205 2206 2207 |
{ /* The same T2 timer, so we should be able to use * common function with the SHUTDOWN-SENT state. */ |
24cb81a6a sctp: Push struct... |
2208 |
return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 |
} /* * Handle an Error received in COOKIE_ECHOED state. * * Only handle the error type of stale COOKIE Error, the other errors will * be ignored. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2225 2226 |
enum sctp_disposition sctp_sf_cookie_echoed_err( struct net *net, |
24cb81a6a sctp: Push struct... |
2227 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
2228 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
2229 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
2230 |
void *arg, |
a85bbeb22 sctp: remove the ... |
2231 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2232 2233 |
{ struct sctp_chunk *chunk = arg; |
d8238d9da sctp: remove the ... |
2234 |
struct sctp_errhdr *err; |
1da177e4c Linux-2.6.12-rc2 |
2235 2236 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2237 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2238 2239 2240 2241 |
/* Make sure that the ERROR chunk has a valid length. * The parameter walking depends on this as well. */ |
87caeba79 sctp: remove the ... |
2242 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6a sctp: Push struct... |
2243 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2244 2245 2246 2247 2248 2249 2250 2251 2252 |
commands); /* Process the error here */ /* FUTURE FIXME: When PR-SCTP related and other optional * parms are emitted, this will have to change to handle multiple * errors. */ sctp_walk_errors(err, chunk->chunk_hdr) { if (SCTP_ERROR_STALE_COOKIE == err->cause) |
24cb81a6a sctp: Push struct... |
2253 |
return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4c Linux-2.6.12-rc2 |
2254 2255 2256 2257 2258 2259 2260 2261 |
arg, commands); } /* It is possible to have malformed error causes, and that * will cause us to end the walk early. However, since * we are discarding the packet, there should be no adverse * affects. */ |
24cb81a6a sctp: Push struct... |
2262 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 |
} /* * Handle a Stale COOKIE Error * * Section: 5.2.6 Handle Stale COOKIE Error * If the association is in the COOKIE-ECHOED state, the endpoint may elect * one of the following three alternatives. * ... * 3) Send a new INIT chunk to the endpoint, adding a Cookie * Preservative parameter requesting an extension to the lifetime of * the State Cookie. When calculating the time extension, an * implementation SHOULD use the RTT information measured based on the * previous COOKIE ECHO / ERROR exchange, and should add no more * than 1 second beyond the measured RTT, due to long State Cookie * lifetimes making the endpoint more subject to a replay attack. * * Verification Tag: Not explicit, but safe to ignore. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2290 2291 2292 2293 2294 2295 2296 |
static enum sctp_disposition sctp_sf_do_5_2_6_stale( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2297 |
{ |
3f7a87d2f [SCTP] sctp_conne... |
2298 |
int attempts = asoc->init_err_counter + 1; |
365ddb65e sctp: remove the ... |
2299 2300 2301 |
struct sctp_chunk *chunk = arg, *reply; struct sctp_cookie_preserve_param bht; struct sctp_bind_addr *bp; |
d8238d9da sctp: remove the ... |
2302 |
struct sctp_errhdr *err; |
365ddb65e sctp: remove the ... |
2303 |
u32 stale; |
1da177e4c Linux-2.6.12-rc2 |
2304 |
|
81845c21d [SCTP]: correct t... |
2305 |
if (attempts > asoc->max_init_attempts) { |
8de8c8738 [SCTP]: Set sk_er... |
2306 2307 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
2308 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b1 [SCTP]: SCTP_CMD_... |
2309 |
SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4c Linux-2.6.12-rc2 |
2310 2311 |
return SCTP_DISPOSITION_DELETE_TCB; } |
d8238d9da sctp: remove the ... |
2312 |
err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4c Linux-2.6.12-rc2 |
2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 |
/* When calculating the time extension, an implementation * SHOULD use the RTT information measured based on the * previous COOKIE ECHO / ERROR exchange, and should add no * more than 1 second beyond the measured RTT, due to long * State Cookie lifetimes making the endpoint more subject to * a replay attack. * Measure of Staleness's unit is usec. (1/1000000 sec) * Suggested Cookie Life-span Increment's unit is msec. * (1/1000 sec) * In general, if you use the suggested cookie life, the value * found in the field of measure of staleness should be doubled * to give ample time to retransmit the new cookie and thus * yield a higher probability of success on the reattempt. */ |
d8238d9da sctp: remove the ... |
2328 |
stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4c Linux-2.6.12-rc2 |
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 |
stale = (stale * 2) / 1000; bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; bht.param_hdr.length = htons(sizeof(bht)); bht.lifespan_increment = htonl(stale); /* Build that new INIT chunk. */ bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); if (!reply) goto nomem; sctp_addto_chunk(reply, sizeof(bht), &bht); /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); /* Stop pending T3-rtx and heartbeat timers */ sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); /* Delete non-primary peer ip addresses since we are transitioning * back to the COOKIE-WAIT state */ sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); |
d808ad9ab [NET] SCTP: Fix w... |
2354 2355 |
/* If we've sent any data bundled with COOKIE-ECHO we will need to * resend |
1da177e4c Linux-2.6.12-rc2 |
2356 |
*/ |
b6157d8e0 SCTP: Fix differe... |
2357 |
sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4c Linux-2.6.12-rc2 |
2358 2359 2360 2361 2362 |
SCTP_TRANSPORT(asoc->peer.primary_path)); /* Cast away the const modifier, as we want to just * rerun it through as a sideffect. */ |
3f7a87d2f [SCTP] sctp_conne... |
2363 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Process an ABORT. * * Section: 9.1 * After checking the Verification Tag, the receiving endpoint shall * remove the association from its record, and shall report the * termination to its upper layer. * * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules * B) Rules for packet carrying ABORT: * * - The endpoint shall always fill in the Verification Tag field of the * outbound packet with the destination endpoint's tag value if it * is known. * * - If the ABORT is sent in response to an OOTB packet, the endpoint * MUST follow the procedure described in Section 8.4. * * - The receiver MUST accept the packet if the Verification Tag * matches either its own tag, OR the tag of its peer. Otherwise, the * receiver MUST silently discard the packet and take no further * action. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2411 2412 |
enum sctp_disposition sctp_sf_do_9_1_abort( struct net *net, |
24cb81a6a sctp: Push struct... |
2413 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
2414 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
2415 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
2416 |
void *arg, |
a85bbeb22 sctp: remove the ... |
2417 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2418 2419 |
{ struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
2420 2421 |
if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2422 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2423 2424 2425 2426 2427 2428 2429 |
/* Make sure that the ABORT chunk has a valid length. * Since this is an ABORT chunk, we have to discard it * because of the following text: * RFC 2960, Section 3.3.7 * If an endpoint receives an ABORT with a format error or for an * association that doesn't exist, it MUST silently discard it. |
25985edce Fix common misspe... |
2430 |
* Because the length is "invalid", we can't really discard just |
1da177e4c Linux-2.6.12-rc2 |
2431 2432 2433 |
* as we do not know its true length. So, to be safe, discard the * packet. */ |
441ae65ae sctp: remove the ... |
2434 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6a sctp: Push struct... |
2435 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2436 |
|
75205f478 [SCTP]: Implement... |
2437 2438 2439 2440 2441 2442 2443 |
/* ADD-IP: Special case for ABORT chunks * F4) One special consideration is that ABORT Chunks arriving * destined to the IP address being deleted MUST be * ignored (see Section 5.3.1 for further details). */ if (SCTP_ADDR_DEL == sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) |
24cb81a6a sctp: Push struct... |
2444 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f478 [SCTP]: Implement... |
2445 |
|
24cb81a6a sctp: Push struct... |
2446 |
return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f478 [SCTP]: Implement... |
2447 |
} |
172a1599b sctp: remove the ... |
2448 2449 |
static enum sctp_disposition __sctp_sf_do_9_1_abort( struct net *net, |
24cb81a6a sctp: Push struct... |
2450 |
const struct sctp_endpoint *ep, |
75205f478 [SCTP]: Implement... |
2451 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
2452 |
const union sctp_subtype type, |
75205f478 [SCTP]: Implement... |
2453 |
void *arg, |
a85bbeb22 sctp: remove the ... |
2454 |
struct sctp_cmd_seq *commands) |
75205f478 [SCTP]: Implement... |
2455 |
{ |
172a1599b sctp: remove the ... |
2456 |
__be16 error = SCTP_ERROR_NO_ERROR; |
75205f478 [SCTP]: Implement... |
2457 |
struct sctp_chunk *chunk = arg; |
95c961747 net: cleanup unsi... |
2458 |
unsigned int len; |
75205f478 [SCTP]: Implement... |
2459 |
|
1da177e4c Linux-2.6.12-rc2 |
2460 2461 |
/* See if we have an error cause code in the chunk. */ len = ntohs(chunk->chunk_hdr->length); |
96ca468b8 sctp: check inval... |
2462 |
if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) { |
d8238d9da sctp: remove the ... |
2463 |
struct sctp_errhdr *err; |
96ca468b8 sctp: check inval... |
2464 |
|
96ca468b8 sctp: check inval... |
2465 2466 |
sctp_walk_errors(err, chunk->chunk_hdr); if ((void *)err != (void *)chunk->chunk_end) |
d8238d9da sctp: remove the ... |
2467 2468 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
96ca468b8 sctp: check inval... |
2469 |
|
d8238d9da sctp: remove the ... |
2470 |
error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
96ca468b8 sctp: check inval... |
2471 |
} |
1da177e4c Linux-2.6.12-rc2 |
2472 |
|
8de8c8738 [SCTP]: Set sk_er... |
2473 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9ab [NET] SCTP: Fix w... |
2474 |
/* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe2 [SCTP]: SCTP_CMD_... |
2475 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a24078 sctp: Make the mi... |
2476 2477 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
2478 2479 2480 2481 2482 2483 2484 2485 2486 |
return SCTP_DISPOSITION_ABORT; } /* * Process an ABORT. (COOKIE-WAIT state) * * See sctp_sf_do_9_1_abort() above. */ |
172a1599b sctp: remove the ... |
2487 2488 2489 2490 2491 2492 2493 |
enum sctp_disposition sctp_sf_cookie_wait_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2494 |
{ |
172a1599b sctp: remove the ... |
2495 |
__be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4c Linux-2.6.12-rc2 |
2496 |
struct sctp_chunk *chunk = arg; |
95c961747 net: cleanup unsi... |
2497 |
unsigned int len; |
1da177e4c Linux-2.6.12-rc2 |
2498 2499 |
if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2500 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2501 2502 2503 2504 2505 2506 2507 |
/* Make sure that the ABORT chunk has a valid length. * Since this is an ABORT chunk, we have to discard it * because of the following text: * RFC 2960, Section 3.3.7 * If an endpoint receives an ABORT with a format error or for an * association that doesn't exist, it MUST silently discard it. |
25985edce Fix common misspe... |
2508 |
* Because the length is "invalid", we can't really discard just |
1da177e4c Linux-2.6.12-rc2 |
2509 2510 2511 |
* as we do not know its true length. So, to be safe, discard the * packet. */ |
441ae65ae sctp: remove the ... |
2512 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6a sctp: Push struct... |
2513 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2514 2515 2516 2517 |
/* See if we have an error cause code in the chunk. */ len = ntohs(chunk->chunk_hdr->length); if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) |
d8238d9da sctp: remove the ... |
2518 |
error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4c Linux-2.6.12-rc2 |
2519 |
|
24cb81a6a sctp: Push struct... |
2520 |
return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c8738 [SCTP]: Set sk_er... |
2521 |
chunk->transport); |
1da177e4c Linux-2.6.12-rc2 |
2522 2523 2524 2525 2526 |
} /* * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) */ |
172a1599b sctp: remove the ... |
2527 2528 |
enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( struct net *net, |
24cb81a6a sctp: Push struct... |
2529 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
2530 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
2531 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
2532 |
void *arg, |
a85bbeb22 sctp: remove the ... |
2533 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2534 |
{ |
24cb81a6a sctp: Push struct... |
2535 |
return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c8738 [SCTP]: Set sk_er... |
2536 |
ENOPROTOOPT, asoc, |
3f7a87d2f [SCTP] sctp_conne... |
2537 |
(struct sctp_transport *)arg); |
1da177e4c Linux-2.6.12-rc2 |
2538 2539 2540 2541 2542 |
} /* * Process an ABORT. (COOKIE-ECHOED state) */ |
172a1599b sctp: remove the ... |
2543 2544 2545 2546 2547 2548 2549 |
enum sctp_disposition sctp_sf_cookie_echoed_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2550 2551 2552 2553 |
{ /* There is a single T1 timer, so we should be able to use * common function with the COOKIE-WAIT state. */ |
24cb81a6a sctp: Push struct... |
2554 |
return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2555 2556 2557 2558 2559 2560 2561 |
} /* * Stop T1 timer and abort association with "INIT failed". * * This is common code called by several sctp_sf_*_abort() functions above. */ |
172a1599b sctp: remove the ... |
2562 2563 2564 2565 2566 2567 |
static enum sctp_disposition sctp_stop_t1_and_abort( struct net *net, struct sctp_cmd_seq *commands, __be16 error, int sk_err, const struct sctp_association *asoc, struct sctp_transport *transport) |
1da177e4c Linux-2.6.12-rc2 |
2568 |
{ |
bb33381d0 net: sctp: rework... |
2569 2570 |
pr_debug("%s: ABORT received (INIT) ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
2571 2572 |
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_CLOSED)); |
24cb81a6a sctp: Push struct... |
2573 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4c Linux-2.6.12-rc2 |
2574 2575 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); |
8de8c8738 [SCTP]: Set sk_er... |
2576 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4c Linux-2.6.12-rc2 |
2577 2578 |
/* CMD_INIT_FAILED will DELETE_TCB. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b1 [SCTP]: SCTP_CMD_... |
2579 |
SCTP_PERR(error)); |
bb33381d0 net: sctp: rework... |
2580 |
|
3f7a87d2f [SCTP] sctp_conne... |
2581 |
return SCTP_DISPOSITION_ABORT; |
1da177e4c Linux-2.6.12-rc2 |
2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 |
} /* * sctp_sf_do_9_2_shut * * Section: 9.2 * Upon the reception of the SHUTDOWN, the peer endpoint shall * - enter the SHUTDOWN-RECEIVED state, * * - stop accepting new data from its SCTP user * * - verify, by checking the Cumulative TSN Ack field of the chunk, * that all its outstanding DATA chunks have been received by the * SHUTDOWN sender. * * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT * send a SHUTDOWN in response to a ULP request. And should discard * subsequent SHUTDOWN chunks. * * If there are still outstanding DATA chunks left, the SHUTDOWN * receiver shall continue to follow normal data transmission * procedures defined in Section 6 until all outstanding DATA chunks * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept * new data from its SCTP user. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2617 2618 2619 2620 2621 2622 2623 2624 2625 |
enum sctp_disposition sctp_sf_do_9_2_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) { enum sctp_disposition disposition; |
1da177e4c Linux-2.6.12-rc2 |
2626 |
struct sctp_chunk *chunk = arg; |
e61e4055b sctp: remove the ... |
2627 |
struct sctp_shutdownhdr *sdh; |
1da177e4c Linux-2.6.12-rc2 |
2628 |
struct sctp_ulpevent *ev; |
df10eec47 sctp: Add check f... |
2629 |
__u32 ctsn; |
1da177e4c Linux-2.6.12-rc2 |
2630 2631 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2632 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2633 2634 |
/* Make sure that the SHUTDOWN chunk has a valid length. */ |
ac23e6813 sctp: fix the nam... |
2635 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6a sctp: Push struct... |
2636 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2637 2638 2639 |
commands); /* Convert the elaborate header. */ |
e61e4055b sctp: remove the ... |
2640 2641 |
sdh = (struct sctp_shutdownhdr *)chunk->skb->data; skb_pull(chunk->skb, sizeof(*sdh)); |
1da177e4c Linux-2.6.12-rc2 |
2642 |
chunk->subh.shutdown_hdr = sdh; |
df10eec47 sctp: Add check f... |
2643 |
ctsn = ntohl(sdh->cum_tsn_ack); |
a2f36eec5 sctp: drop SHUTDO... |
2644 |
if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d0 net: sctp: rework... |
2645 2646 2647 |
pr_debug("%s: ctsn:%x, ctsn_ack_point:%x ", __func__, ctsn, asoc->ctsn_ack_point); |
a2f36eec5 sctp: drop SHUTDO... |
2648 2649 |
return SCTP_DISPOSITION_DISCARD; } |
df10eec47 sctp: Add check f... |
2650 2651 2652 2653 2654 |
/* If Cumulative TSN Ack beyond the max tsn currently * send, terminating the association and respond to the * sender with an ABORT. */ if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6a sctp: Push struct... |
2655 |
return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2656 |
|
eb0e00768 [SCTP]: Fix SCTP_... |
2657 2658 2659 2660 2661 2662 2663 |
/* API 5.3.1.5 SCTP_SHUTDOWN_EVENT * When a peer sends a SHUTDOWN, SCTP delivers this notification to * inform the application that it should cease sending data. */ ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); if (!ev) { disposition = SCTP_DISPOSITION_NOMEM; |
d808ad9ab [NET] SCTP: Fix w... |
2664 |
goto out; |
eb0e00768 [SCTP]: Fix SCTP_... |
2665 2666 |
} sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
1da177e4c Linux-2.6.12-rc2 |
2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 |
/* Upon the reception of the SHUTDOWN, the peer endpoint shall * - enter the SHUTDOWN-RECEIVED state, * - stop accepting new data from its SCTP user * * [This is implicit in the new state.] */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); disposition = SCTP_DISPOSITION_CONSUME; if (sctp_outq_is_empty(&asoc->outqueue)) { |
24cb81a6a sctp: Push struct... |
2678 |
disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4c Linux-2.6.12-rc2 |
2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 |
arg, commands); } if (SCTP_DISPOSITION_NOMEM == disposition) goto out; /* - verify, by checking the Cumulative TSN Ack field of the * chunk, that all its outstanding DATA chunks have been * received by the SHUTDOWN sender. */ sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, |
2178eda82 [SCTP]: SCTP_CMD_... |
2690 |
SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4c Linux-2.6.12-rc2 |
2691 |
|
1da177e4c Linux-2.6.12-rc2 |
2692 2693 2694 |
out: return disposition; } |
2e3f92dad sctp: Fix to hand... |
2695 2696 2697 2698 2699 2700 2701 2702 |
/* * sctp_sf_do_9_2_shut_ctsn * * Once an endpoint has reached the SHUTDOWN-RECEIVED state, * it MUST NOT send a SHUTDOWN in response to a ULP request. * The Cumulative TSN Ack of the received SHUTDOWN chunk * MUST be processed. */ |
172a1599b sctp: remove the ... |
2703 2704 2705 2706 2707 2708 2709 |
enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
2e3f92dad sctp: Fix to hand... |
2710 2711 |
{ struct sctp_chunk *chunk = arg; |
e61e4055b sctp: remove the ... |
2712 |
struct sctp_shutdownhdr *sdh; |
a2f36eec5 sctp: drop SHUTDO... |
2713 |
__u32 ctsn; |
2e3f92dad sctp: Fix to hand... |
2714 2715 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2716 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92dad sctp: Fix to hand... |
2717 2718 |
/* Make sure that the SHUTDOWN chunk has a valid length. */ |
ac23e6813 sctp: fix the nam... |
2719 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6a sctp: Push struct... |
2720 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92dad sctp: Fix to hand... |
2721 |
commands); |
e61e4055b sctp: remove the ... |
2722 |
sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec5 sctp: drop SHUTDO... |
2723 2724 2725 |
ctsn = ntohl(sdh->cum_tsn_ack); if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d0 net: sctp: rework... |
2726 2727 2728 |
pr_debug("%s: ctsn:%x, ctsn_ack_point:%x ", __func__, ctsn, asoc->ctsn_ack_point); |
a2f36eec5 sctp: drop SHUTDO... |
2729 2730 |
return SCTP_DISPOSITION_DISCARD; } |
2e3f92dad sctp: Fix to hand... |
2731 2732 2733 2734 2735 |
/* If Cumulative TSN Ack beyond the max tsn currently * send, terminating the association and respond to the * sender with an ABORT. */ |
a2f36eec5 sctp: drop SHUTDO... |
2736 |
if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6a sctp: Push struct... |
2737 |
return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92dad sctp: Fix to hand... |
2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 |
/* verify, by checking the Cumulative TSN Ack field of the * chunk, that all its outstanding DATA chunks have been * received by the SHUTDOWN sender. */ sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, SCTP_BE32(sdh->cum_tsn_ack)); return SCTP_DISPOSITION_CONSUME; } |
1da177e4c Linux-2.6.12-rc2 |
2748 2749 2750 2751 2752 2753 2754 |
/* RFC 2960 9.2 * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination * transport addresses (either in the IP addresses or in the INIT chunk) * that belong to this association, it should discard the INIT chunk and * retransmit the SHUTDOWN ACK chunk. */ |
172a1599b sctp: remove the ... |
2755 2756 2757 2758 2759 2760 2761 |
enum sctp_disposition sctp_sf_do_9_2_reshutack( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2762 |
{ |
172a1599b sctp: remove the ... |
2763 |
struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
2764 |
struct sctp_chunk *reply; |
ece25dfa0 SCTP: Clean up OO... |
2765 |
/* Make sure that the chunk has a valid length */ |
922dbc5be sctp: remove the ... |
2766 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
2767 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
2768 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 |
/* Since we are not going to really process this INIT, there * is no point in verifying chunk boundries. Just generate * the SHUTDOWN ACK. */ reply = sctp_make_shutdown_ack(asoc, chunk); if (NULL == reply) goto nomem; /* Set the transport for the SHUTDOWN ACK chunk and the timeout for * the T2-SHUTDOWN timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); /* and restart the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * sctp_sf_do_ecn_cwr * * Section: Appendix A: Explicit Congestion Notification * * CWR: * * RFC 2481 details a specific bit for a sender to send in the header of * its next outbound TCP segment to indicate to its peer that it has * reduced its congestion window. This is termed the CWR bit. For * SCTP the same indication is made by including the CWR chunk. * This chunk contains one data element, i.e. the TSN number that * was sent in the ECNE chunk. This element represents the lowest * TSN number in the datagram that was originally marked with the * CE bit. * * Verification Tag: 8.5 Verification Tag [Normal verification] * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2818 2819 2820 2821 2822 2823 |
enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2824 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2825 |
struct sctp_chunk *chunk = arg; |
65f771054 sctp: remove the ... |
2826 |
struct sctp_cwrhdr *cwr; |
34bcca283 [SCTP]: Even more... |
2827 |
u32 lowest_tsn; |
1da177e4c Linux-2.6.12-rc2 |
2828 2829 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2830 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2831 |
|
b515fd275 sctp: remove the ... |
2832 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6a sctp: Push struct... |
2833 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2834 |
commands); |
d808ad9ab [NET] SCTP: Fix w... |
2835 |
|
65f771054 sctp: remove the ... |
2836 2837 |
cwr = (struct sctp_cwrhdr *)chunk->skb->data; skb_pull(chunk->skb, sizeof(*cwr)); |
1da177e4c Linux-2.6.12-rc2 |
2838 |
|
34bcca283 [SCTP]: Even more... |
2839 |
lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4c Linux-2.6.12-rc2 |
2840 2841 |
/* Does this CWR ack the last sent congestion notification? */ |
34bcca283 [SCTP]: Even more... |
2842 |
if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4c Linux-2.6.12-rc2 |
2843 2844 2845 |
/* Stop sending ECNE. */ sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CWR, |
34bcca283 [SCTP]: Even more... |
2846 |
SCTP_U32(lowest_tsn)); |
1da177e4c Linux-2.6.12-rc2 |
2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 |
} return SCTP_DISPOSITION_CONSUME; } /* * sctp_sf_do_ecne * * Section: Appendix A: Explicit Congestion Notification * * ECN-Echo * * RFC 2481 details a specific bit for a receiver to send back in its * TCP acknowledgements to notify the sender of the Congestion * Experienced (CE) bit having arrived from the network. For SCTP this * same indication is made by including the ECNE chunk. This chunk * contains one data element, i.e. the lowest TSN associated with the IP * datagram marked with the CE bit..... * * Verification Tag: 8.5 Verification Tag [Normal verification] * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2874 2875 2876 2877 2878 |
enum sctp_disposition sctp_sf_do_ecne(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2879 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2880 |
struct sctp_chunk *chunk = arg; |
1fb6d83bd sctp: remove the ... |
2881 |
struct sctp_ecnehdr *ecne; |
1da177e4c Linux-2.6.12-rc2 |
2882 2883 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
2884 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
2885 |
|
b515fd275 sctp: remove the ... |
2886 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6a sctp: Push struct... |
2887 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2888 |
commands); |
1fb6d83bd sctp: remove the ... |
2889 2890 |
ecne = (struct sctp_ecnehdr *)chunk->skb->data; skb_pull(chunk->skb, sizeof(*ecne)); |
1da177e4c Linux-2.6.12-rc2 |
2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 |
/* If this is a newer ECNE than the last CWR packet we sent out */ sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, SCTP_U32(ntohl(ecne->lowest_tsn))); return SCTP_DISPOSITION_CONSUME; } /* * Section: 6.2 Acknowledgement on Reception of DATA Chunks * * The SCTP endpoint MUST always acknowledge the reception of each valid * DATA chunk. * * The guidelines on delayed acknowledgement algorithm specified in * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an * acknowledgement SHOULD be generated for at least every second packet * (not every second DATA chunk) received, and SHOULD be generated within * 200 ms of the arrival of any unacknowledged DATA chunk. In some * situations it may be beneficial for an SCTP transmitter to be more * conservative than the algorithms detailed in this document allow. * However, an SCTP transmitter MUST NOT be more aggressive than the * following algorithms allow. * * A SCTP receiver MUST NOT generate more than one SACK for every * incoming packet, other than to update the offered window as the * receiving application consumes new data. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
2929 2930 2931 2932 2933 2934 |
enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
2935 |
{ |
c488b7704 sctp: remove the ... |
2936 |
union sctp_arg force = SCTP_NOFORCE(); |
1da177e4c Linux-2.6.12-rc2 |
2937 2938 2939 2940 2941 2942 |
struct sctp_chunk *chunk = arg; int error; if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
2943 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9ab [NET] SCTP: Fix w... |
2944 |
} |
1da177e4c Linux-2.6.12-rc2 |
2945 |
|
9f8d31471 sctp: remove the ... |
2946 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_data_chunk))) |
24cb81a6a sctp: Push struct... |
2947 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
2948 |
commands); |
cb3f837ba sctp: fix checkpa... |
2949 |
error = sctp_eat_data(asoc, chunk, commands); |
1da177e4c Linux-2.6.12-rc2 |
2950 2951 2952 2953 2954 |
switch (error) { case SCTP_IERROR_NO_ERROR: break; case SCTP_IERROR_HIGH_TSN: case SCTP_IERROR_BAD_STREAM: |
24cb81a6a sctp: Push struct... |
2955 |
SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4c Linux-2.6.12-rc2 |
2956 2957 2958 |
goto discard_noforce; case SCTP_IERROR_DUP_TSN: case SCTP_IERROR_IGNORE_TSN: |
24cb81a6a sctp: Push struct... |
2959 |
SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4c Linux-2.6.12-rc2 |
2960 2961 |
goto discard_force; case SCTP_IERROR_NO_DATA: |
649621e3d sctp: fix use-aft... |
2962 |
return SCTP_DISPOSITION_ABORT; |
f1751c57f sctp: Catch bogus... |
2963 |
case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6a sctp: Push struct... |
2964 |
return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a3 sctp: remove the ... |
2965 2966 |
(u8 *)chunk->subh.data_hdr, sizeof(struct sctp_datahdr)); |
1da177e4c Linux-2.6.12-rc2 |
2967 2968 2969 |
default: BUG(); } |
6dc7694f9 sctp: implement t... |
2970 2971 |
if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) force = SCTP_FORCE(); |
9f70f46bd sctp: properly la... |
2972 |
if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4c Linux-2.6.12-rc2 |
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); } /* If this is the last chunk in a packet, we need to count it * toward sack generation. Note that we need to SACK every * OTHER packet containing data chunks, EVEN IF WE DISCARD * THEM. We elect to NOT generate SACK's if the chunk fails * the verification tag test. * * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks * * The SCTP endpoint MUST always acknowledge the reception of * each valid DATA chunk. * * The guidelines on delayed acknowledgement algorithm * specified in Section 4.2 of [RFC2581] SHOULD be followed. * Specifically, an acknowledgement SHOULD be generated for at * least every second packet (not every second DATA chunk) * received, and SHOULD be generated within 200 ms of the * arrival of any unacknowledged DATA chunk. In some * situations it may be beneficial for an SCTP transmitter to * be more conservative than the algorithms detailed in this * document allow. However, an SCTP transmitter MUST NOT be * more aggressive than the following algorithms allow. */ |
52ccb8e90 [SCTP]: Update SC... |
2999 |
if (chunk->end_of_packet) |
6dc7694f9 sctp: implement t... |
3000 |
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4c Linux-2.6.12-rc2 |
3001 |
|
1da177e4c Linux-2.6.12-rc2 |
3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 |
return SCTP_DISPOSITION_CONSUME; discard_force: /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks * * When a packet arrives with duplicate DATA chunk(s) and with * no new DATA chunk(s), the endpoint MUST immediately send a * SACK with no delay. If a packet arrives with duplicate * DATA chunk(s) bundled with new DATA chunks, the endpoint * MAY immediately send a SACK. Normally receipt of duplicate * DATA chunks will occur when the original SACK chunk was lost * and the peer's RTO has expired. The duplicate TSN number(s) * SHOULD be reported in the SACK as duplicate. */ /* In our case, we split the MAY SACK advice up whether or not * the last chunk is a duplicate.' */ if (chunk->end_of_packet) sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); return SCTP_DISPOSITION_DISCARD; discard_noforce: |
52ccb8e90 [SCTP]: Update SC... |
3024 |
if (chunk->end_of_packet) |
6dc7694f9 sctp: implement t... |
3025 |
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4c Linux-2.6.12-rc2 |
3026 |
|
1da177e4c Linux-2.6.12-rc2 |
3027 |
return SCTP_DISPOSITION_DISCARD; |
1da177e4c Linux-2.6.12-rc2 |
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 |
} /* * sctp_sf_eat_data_fast_4_4 * * Section: 4 (4) * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received * DATA chunks without delay. * * Verification Tag: 8.5 Verification Tag [Normal verification] * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3046 3047 3048 3049 3050 3051 3052 |
enum sctp_disposition sctp_sf_eat_data_fast_4_4( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3053 3054 3055 3056 3057 3058 3059 |
{ struct sctp_chunk *chunk = arg; int error; if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
3060 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3061 |
} |
9f8d31471 sctp: remove the ... |
3062 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_data_chunk))) |
24cb81a6a sctp: Push struct... |
3063 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3064 |
commands); |
cb3f837ba sctp: fix checkpa... |
3065 |
error = sctp_eat_data(asoc, chunk, commands); |
1da177e4c Linux-2.6.12-rc2 |
3066 3067 3068 3069 3070 3071 3072 3073 |
switch (error) { case SCTP_IERROR_NO_ERROR: case SCTP_IERROR_HIGH_TSN: case SCTP_IERROR_DUP_TSN: case SCTP_IERROR_IGNORE_TSN: case SCTP_IERROR_BAD_STREAM: break; case SCTP_IERROR_NO_DATA: |
649621e3d sctp: fix use-aft... |
3074 |
return SCTP_DISPOSITION_ABORT; |
f1751c57f sctp: Catch bogus... |
3075 |
case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6a sctp: Push struct... |
3076 |
return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a3 sctp: remove the ... |
3077 3078 |
(u8 *)chunk->subh.data_hdr, sizeof(struct sctp_datahdr)); |
1da177e4c Linux-2.6.12-rc2 |
3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 |
default: BUG(); } /* Go a head and force a SACK, since we are shutting down. */ /* Implementor's Guide. * * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately * respond to each received packet containing one or more DATA chunk(s) * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer */ if (chunk->end_of_packet) { /* We must delay the chunk creation since the cumulative * TSN has not been updated yet. */ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); } |
1da177e4c Linux-2.6.12-rc2 |
3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 |
return SCTP_DISPOSITION_CONSUME; } /* * Section: 6.2 Processing a Received SACK * D) Any time a SACK arrives, the endpoint performs the following: * * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, * then drop the SACK. Since Cumulative TSN Ack is monotonically * increasing, a SACK whose Cumulative TSN Ack is less than the * Cumulative TSN Ack Point indicates an out-of-order SACK. * * ii) Set rwnd equal to the newly received a_rwnd minus the number * of bytes still outstanding after processing the Cumulative TSN Ack * and the Gap Ack Blocks. * * iii) If the SACK is missing a TSN that was previously * acknowledged via a Gap Ack Block (e.g., the data receiver * reneged on the data), then mark the corresponding DATA chunk * as available for retransmit: Mark it as missing for fast * retransmit as described in Section 7.2.4 and if no retransmit * timer is running for the destination address to which the DATA * chunk was originally transmitted, then T3-rtx is started for * that destination address. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3135 3136 3137 3138 3139 3140 |
enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3141 3142 |
{ struct sctp_chunk *chunk = arg; |
787310859 sctp: remove the ... |
3143 |
struct sctp_sackhdr *sackh; |
1da177e4c Linux-2.6.12-rc2 |
3144 3145 3146 |
__u32 ctsn; if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
3147 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3148 3149 |
/* Make sure that the SACK chunk has a valid length. */ |
d4d6c6148 sctp: remove the ... |
3150 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6a sctp: Push struct... |
3151 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3152 3153 3154 3155 3156 3157 |
commands); /* Pull the SACK chunk from the data buffer */ sackh = sctp_sm_pull_sack(chunk); /* Was this a bogus SACK? */ if (!sackh) |
24cb81a6a sctp: Push struct... |
3158 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 |
chunk->subh.sack_hdr = sackh; ctsn = ntohl(sackh->cum_tsn_ack); /* i) If Cumulative TSN Ack is less than the Cumulative TSN * Ack Point, then drop the SACK. Since Cumulative TSN * Ack is monotonically increasing, a SACK whose * Cumulative TSN Ack is less than the Cumulative TSN Ack * Point indicates an out-of-order SACK. */ if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d0 net: sctp: rework... |
3169 3170 3171 |
pr_debug("%s: ctsn:%x, ctsn_ack_point:%x ", __func__, ctsn, asoc->ctsn_ack_point); |
1da177e4c Linux-2.6.12-rc2 |
3172 3173 |
return SCTP_DISPOSITION_DISCARD; } |
aecedeab6 SCTP: drop SACK i... |
3174 3175 3176 3177 3178 |
/* If Cumulative TSN Ack beyond the max tsn currently * send, terminating the association and respond to the * sender with an ABORT. */ if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6a sctp: Push struct... |
3179 |
return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab6 SCTP: drop SACK i... |
3180 |
|
1da177e4c Linux-2.6.12-rc2 |
3181 |
/* Return this SACK for further processing. */ |
edfee0339 sctp: check src a... |
3182 |
sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4c Linux-2.6.12-rc2 |
3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 |
/* Note: We do the rest of the work on the PROCESS_SACK * sideeffect. */ return SCTP_DISPOSITION_CONSUME; } /* * Generate an ABORT in response to a packet. * |
047a2428a [SCTP] Implement ... |
3193 |
* Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4c Linux-2.6.12-rc2 |
3194 |
* |
047a2428a [SCTP] Implement ... |
3195 3196 3197 3198 3199 3200 3201 3202 |
* 8) The receiver should respond to the sender of the OOTB packet with * an ABORT. When sending the ABORT, the receiver of the OOTB packet * MUST fill in the Verification Tag field of the outbound packet * with the value found in the Verification Tag field of the OOTB * packet and set the T-bit in the Chunk Flags to indicate that the * Verification Tag is reflected. After sending this ABORT, the * receiver of the OOTB packet shall discard the OOTB packet and take * no further action. |
1da177e4c Linux-2.6.12-rc2 |
3203 3204 3205 3206 3207 |
* * Verification Tag: * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3208 3209 |
static enum sctp_disposition sctp_sf_tabort_8_4_8( struct net *net, |
24cb81a6a sctp: Push struct... |
3210 |
const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
3211 |
const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
3212 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
3213 |
void *arg, |
a85bbeb22 sctp: remove the ... |
3214 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3215 3216 3217 3218 |
{ struct sctp_packet *packet = NULL; struct sctp_chunk *chunk = arg; struct sctp_chunk *abort; |
2ce955035 sctp: Make the ct... |
3219 |
packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075d sctp: reduce inde... |
3220 3221 |
if (!packet) return SCTP_DISPOSITION_NOMEM; |
1da177e4c Linux-2.6.12-rc2 |
3222 |
|
eab59075d sctp: reduce inde... |
3223 3224 3225 3226 3227 3228 3229 3230 |
/* Make an ABORT. The T bit will be set if the asoc * is NULL. */ abort = sctp_make_abort(asoc, chunk, 0); if (!abort) { sctp_ootb_pkt_free(packet); return SCTP_DISPOSITION_NOMEM; } |
047a2428a [SCTP] Implement ... |
3231 |
|
eab59075d sctp: reduce inde... |
3232 3233 3234 |
/* Reflect vtag if T-Bit is set */ if (sctp_test_T_bit(abort)) packet->vtag = ntohl(chunk->sctp_hdr->vtag); |
1da177e4c Linux-2.6.12-rc2 |
3235 |
|
eab59075d sctp: reduce inde... |
3236 3237 |
/* Set the skb to the belonging sock for accounting. */ abort->skb->sk = ep->base.sk; |
1da177e4c Linux-2.6.12-rc2 |
3238 |
|
eab59075d sctp: reduce inde... |
3239 |
sctp_packet_append_chunk(packet, abort); |
1da177e4c Linux-2.6.12-rc2 |
3240 |
|
eab59075d sctp: reduce inde... |
3241 3242 |
sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
1da177e4c Linux-2.6.12-rc2 |
3243 |
|
eab59075d sctp: reduce inde... |
3244 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
3245 |
|
eab59075d sctp: reduce inde... |
3246 3247 |
sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 |
} /* * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR * event as ULP notification for each cause included in the chunk. * * API 5.3.1.3 - SCTP_REMOTE_ERROR * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3258 3259 3260 3261 3262 3263 |
enum sctp_disposition sctp_sf_operr_notify(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3264 3265 |
{ struct sctp_chunk *chunk = arg; |
d8238d9da sctp: remove the ... |
3266 |
struct sctp_errhdr *err; |
1da177e4c Linux-2.6.12-rc2 |
3267 3268 |
if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
3269 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3270 3271 |
/* Make sure that the ERROR chunk has a valid length. */ |
87caeba79 sctp: remove the ... |
3272 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6a sctp: Push struct... |
3273 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3274 |
commands); |
8a00be1c8 sctp: check param... |
3275 3276 |
sctp_walk_errors(err, chunk->chunk_hdr); if ((void *)err != (void *)chunk->chunk_end) |
24cb81a6a sctp: Push struct... |
3277 |
return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c8 sctp: check param... |
3278 |
(void *)err, commands); |
1da177e4c Linux-2.6.12-rc2 |
3279 |
|
3df267873 sctp: fix kernel ... |
3280 3281 |
sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, SCTP_CHUNK(chunk)); |
1da177e4c Linux-2.6.12-rc2 |
3282 |
|
1da177e4c Linux-2.6.12-rc2 |
3283 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 |
} /* * Process an inbound SHUTDOWN ACK. * * From Section 9.2: * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its * peer, and remove all record of the association. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
3296 3297 3298 3299 3300 3301 |
enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3302 3303 3304 3305 3306 3307 |
{ struct sctp_chunk *chunk = arg; struct sctp_chunk *reply; struct sctp_ulpevent *ev; if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6a sctp: Push struct... |
3308 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3309 3310 |
/* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ |
922dbc5be sctp: remove the ... |
3311 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
3312 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3313 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
3314 3315 3316 3317 3318 3319 |
/* 10.2 H) SHUTDOWN COMPLETE notification * * When SCTP completes the shutdown procedures (section 9.2) this * notification is passed to the upper layer. */ ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, |
a5a35e767 [SCTP]: Implement... |
3320 |
0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
3321 3322 |
if (!ev) goto nomem; |
df7deeb54 [SCTP]: Cleanup n... |
3323 3324 3325 3326 3327 3328 3329 3330 |
/* ...send a SHUTDOWN COMPLETE chunk to its peer, */ reply = sctp_make_shutdown_complete(asoc, chunk); if (!reply) goto nomem_chunk; /* Do all the commands now (after allocation), so that we * have consistent state if memory allocation failes */ |
1da177e4c Linux-2.6.12-rc2 |
3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 |
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall * stop the T2-shutdown timer, */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
1da177e4c Linux-2.6.12-rc2 |
3341 3342 |
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_CLOSED)); |
b01a24078 sctp: Make the mi... |
3343 3344 |
SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
3345 3346 3347 3348 3349 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); /* ...and remove all record of the association. */ sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); return SCTP_DISPOSITION_DELETE_TCB; |
df7deeb54 [SCTP]: Cleanup n... |
3350 3351 |
nomem_chunk: sctp_ulpevent_free(ev); |
1da177e4c Linux-2.6.12-rc2 |
3352 3353 3354 3355 3356 |
nomem: return SCTP_DISPOSITION_NOMEM; } /* |
047a2428a [SCTP] Implement ... |
3357 3358 |
* RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. * |
1da177e4c Linux-2.6.12-rc2 |
3359 3360 3361 3362 3363 |
* 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB * packet must fill in the Verification Tag field of the outbound * packet with the Verification Tag received in the SHUTDOWN ACK and |
047a2428a [SCTP] Implement ... |
3364 3365 |
* set the T-bit in the Chunk Flags to indicate that the Verification * Tag is reflected. |
1da177e4c Linux-2.6.12-rc2 |
3366 3367 3368 3369 3370 |
* * 8) The receiver should respond to the sender of the OOTB packet with * an ABORT. When sending the ABORT, the receiver of the OOTB packet * MUST fill in the Verification Tag field of the outbound packet * with the value found in the Verification Tag field of the OOTB |
047a2428a [SCTP] Implement ... |
3371 3372 3373 3374 |
* packet and set the T-bit in the Chunk Flags to indicate that the * Verification Tag is reflected. After sending this ABORT, the * receiver of the OOTB packet shall discard the OOTB packet and take * no further action. |
1da177e4c Linux-2.6.12-rc2 |
3375 |
*/ |
172a1599b sctp: remove the ... |
3376 3377 3378 3379 3380 |
enum sctp_disposition sctp_sf_ootb(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3381 3382 3383 |
{ struct sctp_chunk *chunk = arg; struct sk_buff *skb = chunk->skb; |
922dbc5be sctp: remove the ... |
3384 |
struct sctp_chunkhdr *ch; |
d8238d9da sctp: remove the ... |
3385 |
struct sctp_errhdr *err; |
85c5ed4e4 sctp: handle ootb... |
3386 |
int ootb_cookie_ack = 0; |
172a1599b sctp: remove the ... |
3387 3388 |
int ootb_shut_ack = 0; __u8 *ch_end; |
1da177e4c Linux-2.6.12-rc2 |
3389 |
|
b01a24078 sctp: Make the mi... |
3390 |
SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4c Linux-2.6.12-rc2 |
3391 |
|
922dbc5be sctp: remove the ... |
3392 |
ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4c Linux-2.6.12-rc2 |
3393 |
do { |
ece25dfa0 SCTP: Clean up OO... |
3394 |
/* Report violation if the chunk is less then minimal */ |
922dbc5be sctp: remove the ... |
3395 |
if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6a sctp: Push struct... |
3396 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
3397 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
3398 |
|
bf911e985 sctp: validate ch... |
3399 3400 3401 3402 3403 |
/* Report violation if chunk len overflows */ ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); if (ch_end > skb_tail_pointer(skb)) return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, commands); |
ece25dfa0 SCTP: Clean up OO... |
3404 3405 3406 |
/* Now that we know we at least have a chunk header, * do things that are type appropriate. */ |
1da177e4c Linux-2.6.12-rc2 |
3407 3408 3409 3410 3411 3412 3413 3414 3415 |
if (SCTP_CID_SHUTDOWN_ACK == ch->type) ootb_shut_ack = 1; /* RFC 2960, Section 3.3.7 * Moreover, under any circumstances, an endpoint that * receives an ABORT MUST NOT respond to that ABORT by * sending an ABORT of its own. */ if (SCTP_CID_ABORT == ch->type) |
24cb81a6a sctp: Push struct... |
3416 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9ab [NET] SCTP: Fix w... |
3417 |
|
85c5ed4e4 sctp: handle ootb... |
3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 |
/* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR * or a COOKIE ACK the SCTP Packet should be silently * discarded. */ if (SCTP_CID_COOKIE_ACK == ch->type) ootb_cookie_ack = 1; if (SCTP_CID_ERROR == ch->type) { sctp_walk_errors(err, ch) { if (SCTP_ERROR_STALE_COOKIE == err->cause) { ootb_cookie_ack = 1; break; } } } |
922dbc5be sctp: remove the ... |
3434 |
ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc3 [SK_BUFF]: Conver... |
3435 |
} while (ch_end < skb_tail_pointer(skb)); |
1da177e4c Linux-2.6.12-rc2 |
3436 3437 |
if (ootb_shut_ack) |
24cb81a6a sctp: Push struct... |
3438 |
return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e4 sctp: handle ootb... |
3439 |
else if (ootb_cookie_ack) |
24cb81a6a sctp: Push struct... |
3440 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3441 |
else |
24cb81a6a sctp: Push struct... |
3442 |
return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3443 3444 3445 3446 3447 |
} /* * Handle an "Out of the blue" SHUTDOWN ACK. * |
047a2428a [SCTP] Implement ... |
3448 3449 |
* Section: 8.4 5, sctpimpguide 2.41. * |
1da177e4c Linux-2.6.12-rc2 |
3450 |
* 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428a [SCTP] Implement ... |
3451 3452 3453 3454 3455 3456 |
* respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB * packet must fill in the Verification Tag field of the outbound * packet with the Verification Tag received in the SHUTDOWN ACK and * set the T-bit in the Chunk Flags to indicate that the Verification * Tag is reflected. |
1da177e4c Linux-2.6.12-rc2 |
3457 3458 3459 3460 3461 |
* * Inputs * (endpoint, asoc, type, arg, commands) * * Outputs |
172a1599b sctp: remove the ... |
3462 |
* (enum sctp_disposition) |
1da177e4c Linux-2.6.12-rc2 |
3463 3464 3465 |
* * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3466 3467 3468 3469 3470 3471 3472 |
static enum sctp_disposition sctp_sf_shut_8_4_5( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3473 3474 3475 3476 |
{ struct sctp_packet *packet = NULL; struct sctp_chunk *chunk = arg; struct sctp_chunk *shut; |
2ce955035 sctp: Make the ct... |
3477 |
packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff015616 sctp: reduce inde... |
3478 3479 |
if (!packet) return SCTP_DISPOSITION_NOMEM; |
1da177e4c Linux-2.6.12-rc2 |
3480 |
|
1ff015616 sctp: reduce inde... |
3481 3482 3483 3484 3485 3486 3487 3488 |
/* Make an SHUTDOWN_COMPLETE. * The T bit will be set if the asoc is NULL. */ shut = sctp_make_shutdown_complete(asoc, chunk); if (!shut) { sctp_ootb_pkt_free(packet); return SCTP_DISPOSITION_NOMEM; } |
047a2428a [SCTP] Implement ... |
3489 |
|
1ff015616 sctp: reduce inde... |
3490 3491 3492 |
/* Reflect vtag if T-Bit is set */ if (sctp_test_T_bit(shut)) packet->vtag = ntohl(chunk->sctp_hdr->vtag); |
1da177e4c Linux-2.6.12-rc2 |
3493 |
|
1ff015616 sctp: reduce inde... |
3494 3495 |
/* Set the skb to the belonging sock for accounting. */ shut->skb->sk = ep->base.sk; |
1da177e4c Linux-2.6.12-rc2 |
3496 |
|
1ff015616 sctp: reduce inde... |
3497 |
sctp_packet_append_chunk(packet, shut); |
1da177e4c Linux-2.6.12-rc2 |
3498 |
|
1ff015616 sctp: reduce inde... |
3499 3500 |
sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
1da177e4c Linux-2.6.12-rc2 |
3501 |
|
1ff015616 sctp: reduce inde... |
3502 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
3503 |
|
1ff015616 sctp: reduce inde... |
3504 3505 3506 |
/* If the chunk length is invalid, we don't want to process * the reset of the packet. */ |
922dbc5be sctp: remove the ... |
3507 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
3508 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3509 |
|
1ff015616 sctp: reduce inde... |
3510 3511 3512 3513 3514 |
/* We need to discard the rest of the packet to prevent * potential bomming attacks from additional bundled chunks. * This is documented in SCTP Threats ID. */ return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 |
} /* * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. * * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the * procedures in section 8.4 SHOULD be followed, in other words it * should be treated as an Out Of The Blue packet. * [This means that we do NOT check the Verification Tag on these * chunks. --piggy ] * */ |
172a1599b sctp: remove the ... |
3528 3529 3530 3531 3532 3533 |
enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3534 |
{ |
ece25dfa0 SCTP: Clean up OO... |
3535 3536 3537 |
struct sctp_chunk *chunk = arg; /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ |
922dbc5be sctp: remove the ... |
3538 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
3539 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
3540 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
3541 3542 3543 3544 3545 |
/* Although we do have an association in this case, it corresponds * to a restarted association. So the packet is treated as an OOTB * packet and the state function that handles OOTB SHUTDOWN_ACK is * called with a NULL association. */ |
24cb81a6a sctp: Push struct... |
3546 |
SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89df sctp: Fix the SNM... |
3547 |
|
24cb81a6a sctp: Push struct... |
3548 |
return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3549 3550 3551 |
} /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ |
172a1599b sctp: remove the ... |
3552 3553 3554 3555 3556 3557 |
enum sctp_disposition sctp_sf_do_asconf(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3558 |
{ |
172a1599b sctp: remove the ... |
3559 3560 3561 3562 3563 |
struct sctp_paramhdr *err_param = NULL; struct sctp_chunk *asconf_ack = NULL; struct sctp_chunk *chunk = arg; struct sctp_addiphdr *hdr; __u32 serial; |
1da177e4c Linux-2.6.12-rc2 |
3564 3565 3566 3567 |
if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
3568 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3569 |
} |
6afd2e83c [SCTP]: Discard u... |
3570 3571 3572 3573 3574 3575 |
/* ADD-IP: Section 4.1.1 * This chunk MUST be sent in an authenticated way by using * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk * is received unauthenticated it MUST be silently discarded as * described in [I-D.ietf-tsvwg-sctp-auth]. */ |
e1fc3b14f sctp: Make sysctl... |
3576 |
if (!net->sctp.addip_noauth && !chunk->auth) |
68d754694 sctp: remove the ... |
3577 3578 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
6afd2e83c [SCTP]: Discard u... |
3579 |
|
1da177e4c Linux-2.6.12-rc2 |
3580 |
/* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d754694 sctp: remove the ... |
3581 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6a sctp: Push struct... |
3582 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3583 |
commands); |
65205cc46 sctp: remove the ... |
3584 |
hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4c Linux-2.6.12-rc2 |
3585 |
serial = ntohl(hdr->serial); |
6f4c618dd SCTP : Add paramt... |
3586 |
/* Verify the ASCONF chunk before processing it. */ |
9de7922bc net: sctp: fix sk... |
3587 |
if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6a sctp: Push struct... |
3588 |
return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba0166708 sctp: Fix kernel ... |
3589 |
(void *)err_param, commands); |
6f4c618dd SCTP : Add paramt... |
3590 |
|
a08de64d0 [SCTP]: Update AS... |
3591 |
/* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4c Linux-2.6.12-rc2 |
3592 |
* the endpoint stored in a new association variable |
d808ad9ab [NET] SCTP: Fix w... |
3593 |
* 'Peer-Serial-Number'. |
1da177e4c Linux-2.6.12-rc2 |
3594 3595 |
*/ if (serial == asoc->peer.addip_serial + 1) { |
a08de64d0 [SCTP]: Update AS... |
3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 |
/* If this is the first instance of ASCONF in the packet, * we can clean our old ASCONF-ACKs. */ if (!chunk->has_asconf) sctp_assoc_clean_asconf_ack_cache(asoc); /* ADDIP 5.2 E4) When the Sequence Number matches the next one * expected, process the ASCONF as described below and after * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to * the response packet and cache a copy of it (in the event it * later needs to be retransmitted). * * Essentially, do V1-V5. |
1da177e4c Linux-2.6.12-rc2 |
3609 3610 3611 3612 3613 |
*/ asconf_ack = sctp_process_asconf((struct sctp_association *) asoc, chunk); if (!asconf_ack) return SCTP_DISPOSITION_NOMEM; |
a08de64d0 [SCTP]: Update AS... |
3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 |
} else if (serial < asoc->peer.addip_serial + 1) { /* ADDIP 5.2 E2) * If the value found in the Sequence Number is less than the * ('Peer- Sequence-Number' + 1), simply skip to the next * ASCONF, and include in the outbound response packet * any previously cached ASCONF-ACK response that was * sent and saved that matches the Sequence Number of the * ASCONF. Note: It is possible that no cached ASCONF-ACK * Chunk exists. This will occur when an older ASCONF * arrives out of order. In such a case, the receiver * should skip the ASCONF Chunk and not include ASCONF-ACK * Chunk for that chunk. |
1da177e4c Linux-2.6.12-rc2 |
3626 |
*/ |
a08de64d0 [SCTP]: Update AS... |
3627 3628 |
asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); if (!asconf_ack) |
1da177e4c Linux-2.6.12-rc2 |
3629 |
return SCTP_DISPOSITION_DISCARD; |
31b02e154 sctp: Failover tr... |
3630 3631 3632 3633 3634 3635 |
/* Reset the transport so that we select the correct one * this time around. This is to make sure that we don't * accidentally use a stale transport that's been removed. */ asconf_ack->transport = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3636 |
} else { |
a08de64d0 [SCTP]: Update AS... |
3637 |
/* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4c Linux-2.6.12-rc2 |
3638 |
* it must be either a stale packet or from an attacker. |
d808ad9ab [NET] SCTP: Fix w... |
3639 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
3640 3641 |
return SCTP_DISPOSITION_DISCARD; } |
a08de64d0 [SCTP]: Update AS... |
3642 3643 3644 3645 3646 3647 3648 |
/* ADDIP 5.2 E6) The destination address of the SCTP packet * containing the ASCONF-ACK Chunks MUST be the source address of * the SCTP packet that held the ASCONF Chunks. * * To do this properly, we'll set the destination address of the chunk * and at the transmit time, will try look up the transport to use. * Since ASCONFs may be bundled, the correct transport may not be |
94e2bd688 tree-wide: fix so... |
3649 |
* created until we process the entire packet, thus this workaround. |
1da177e4c Linux-2.6.12-rc2 |
3650 |
*/ |
a08de64d0 [SCTP]: Update AS... |
3651 |
asconf_ack->dest = chunk->source; |
1da177e4c Linux-2.6.12-rc2 |
3652 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc2 sctp: Bundle HEAE... |
3653 |
if (asoc->new_transport) { |
f7010e614 sctp: fix checkpa... |
3654 |
sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc2 sctp: Bundle HEAE... |
3655 3656 |
((struct sctp_association *)asoc)->new_transport = NULL; } |
d808ad9ab [NET] SCTP: Fix w... |
3657 |
|
1da177e4c Linux-2.6.12-rc2 |
3658 3659 3660 3661 3662 3663 3664 3665 |
return SCTP_DISPOSITION_CONSUME; } /* * ADDIP Section 4.3 General rules for address manipulation * When building TLV parameters for the ASCONF Chunk that will add or * delete IP addresses the D0 to D13 rules should be applied: */ |
172a1599b sctp: remove the ... |
3666 3667 3668 3669 3670 3671 |
enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3672 |
{ |
172a1599b sctp: remove the ... |
3673 3674 3675 3676 3677 3678 |
struct sctp_chunk *last_asconf = asoc->addip_last_asconf; struct sctp_paramhdr *err_param = NULL; struct sctp_chunk *asconf_ack = arg; struct sctp_addiphdr *addip_hdr; __u32 sent_serial, rcvd_serial; struct sctp_chunk *abort; |
1da177e4c Linux-2.6.12-rc2 |
3679 3680 3681 3682 |
if (!sctp_vtag_verify(asconf_ack, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
3683 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3684 |
} |
6afd2e83c [SCTP]: Discard u... |
3685 3686 3687 3688 3689 3690 |
/* ADD-IP, Section 4.1.2: * This chunk MUST be sent in an authenticated way by using * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk * is received unauthenticated it MUST be silently discarded as * described in [I-D.ietf-tsvwg-sctp-auth]. */ |
e1fc3b14f sctp: Make sysctl... |
3691 |
if (!net->sctp.addip_noauth && !asconf_ack->auth) |
68d754694 sctp: remove the ... |
3692 3693 |
return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
6afd2e83c [SCTP]: Discard u... |
3694 |
|
1da177e4c Linux-2.6.12-rc2 |
3695 |
/* Make sure that the ADDIP chunk has a valid length. */ |
68d754694 sctp: remove the ... |
3696 3697 |
if (!sctp_chunk_length_valid(asconf_ack, sizeof(struct sctp_addip_chunk))) |
24cb81a6a sctp: Push struct... |
3698 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3699 |
commands); |
65205cc46 sctp: remove the ... |
3700 |
addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4c Linux-2.6.12-rc2 |
3701 |
rcvd_serial = ntohl(addip_hdr->serial); |
6f4c618dd SCTP : Add paramt... |
3702 |
/* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922bc net: sctp: fix sk... |
3703 |
if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6a sctp: Push struct... |
3704 |
return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba0166708 sctp: Fix kernel ... |
3705 |
(void *)err_param, commands); |
6f4c618dd SCTP : Add paramt... |
3706 |
|
1da177e4c Linux-2.6.12-rc2 |
3707 |
if (last_asconf) { |
65205cc46 sctp: remove the ... |
3708 |
addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4c Linux-2.6.12-rc2 |
3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 |
sent_serial = ntohl(addip_hdr->serial); } else { sent_serial = asoc->addip_serial - 1; } /* D0) If an endpoint receives an ASCONF-ACK that is greater than or * equal to the next serial number to be used but no ASCONF chunk is * outstanding the endpoint MUST ABORT the association. Note that a * sequence number is greater than if it is no more than 2^^31-1 * larger than the current sequence number (using serial arithmetic). */ if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && !(asoc->addip_last_asconf)) { abort = sctp_make_abort(asoc, asconf_ack, |
d8238d9da sctp: remove the ... |
3723 |
sizeof(struct sctp_errhdr)); |
1da177e4c Linux-2.6.12-rc2 |
3724 |
if (abort) { |
00f1c2df2 SCTP: Fix to enco... |
3725 |
sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4c Linux-2.6.12-rc2 |
3726 3727 3728 3729 3730 3731 3732 3733 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); } /* We are going to ABORT, so we might as well stop * processing the rest of the chunks in the packet. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
cb3f837ba sctp: fix checkpa... |
3734 |
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c8738 [SCTP]: Set sk_er... |
3735 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9ab [NET] SCTP: Fix w... |
3736 |
SCTP_ERROR(ECONNABORTED)); |
1da177e4c Linux-2.6.12-rc2 |
3737 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
3738 |
SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a24078 sctp: Make the mi... |
3739 3740 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
3741 3742 3743 3744 3745 3746 3747 3748 |
return SCTP_DISPOSITION_ABORT; } if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); if (!sctp_process_asconf_ack((struct sctp_association *)asoc, |
c07866934 sctp: Fix oops wh... |
3749 3750 3751 3752 3753 3754 |
asconf_ack)) { /* Successfully processed ASCONF_ACK. We can * release the next asconf if we have one. */ sctp_add_cmd_sf(commands, SCTP_CMD_SEND_NEXT_ASCONF, SCTP_NULL()); |
1da177e4c Linux-2.6.12-rc2 |
3755 |
return SCTP_DISPOSITION_CONSUME; |
c07866934 sctp: Fix oops wh... |
3756 |
} |
1da177e4c Linux-2.6.12-rc2 |
3757 3758 |
abort = sctp_make_abort(asoc, asconf_ack, |
d8238d9da sctp: remove the ... |
3759 |
sizeof(struct sctp_errhdr)); |
1da177e4c Linux-2.6.12-rc2 |
3760 |
if (abort) { |
00f1c2df2 SCTP: Fix to enco... |
3761 |
sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4c Linux-2.6.12-rc2 |
3762 3763 3764 3765 3766 3767 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); } /* We are going to ABORT, so we might as well stop * processing the rest of the chunks in the packet. */ |
cb3f837ba sctp: fix checkpa... |
3768 |
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c8738 [SCTP]: Set sk_er... |
3769 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9ab [NET] SCTP: Fix w... |
3770 |
SCTP_ERROR(ECONNABORTED)); |
1da177e4c Linux-2.6.12-rc2 |
3771 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
3772 |
SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a24078 sctp: Make the mi... |
3773 3774 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
3775 3776 3777 3778 3779 |
return SCTP_DISPOSITION_ABORT; } return SCTP_DISPOSITION_DISCARD; } |
2040d3d7a sctp: add reconf ... |
3780 |
/* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599b sctp: remove the ... |
3781 3782 3783 3784 3785 3786 |
enum sctp_disposition sctp_sf_do_reconf(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
2040d3d7a sctp: add reconf ... |
3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 |
{ struct sctp_paramhdr *err_param = NULL; struct sctp_chunk *chunk = arg; struct sctp_reconf_chunk *hdr; union sctp_params param; if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); } /* Make sure that the RECONF chunk has a valid length. */ if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, commands); if (!sctp_verify_reconf(asoc, chunk, &err_param)) return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, (void *)err_param, commands); hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; sctp_walk_params(param, hdr, params) { struct sctp_chunk *reply = NULL; struct sctp_ulpevent *ev = NULL; if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) reply = sctp_process_strreset_outreq( (struct sctp_association *)asoc, param, &ev); else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) reply = sctp_process_strreset_inreq( (struct sctp_association *)asoc, param, &ev); |
692787cef sctp: implement r... |
3819 3820 3821 |
else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) reply = sctp_process_strreset_tsnreq( (struct sctp_association *)asoc, param, &ev); |
50a41591f sctp: implement r... |
3822 3823 3824 |
else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) reply = sctp_process_strreset_addstrm_out( (struct sctp_association *)asoc, param, &ev); |
c5c4ebb3a sctp: implement r... |
3825 3826 3827 |
else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) reply = sctp_process_strreset_addstrm_in( (struct sctp_association *)asoc, param, &ev); |
11ae76e67 sctp: implement r... |
3828 3829 3830 |
else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) reply = sctp_process_strreset_resp( (struct sctp_association *)asoc, param, &ev); |
2040d3d7a sctp: add reconf ... |
3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 |
if (ev) sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); if (reply) sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); } return SCTP_DISPOSITION_CONSUME; } |
1da177e4c Linux-2.6.12-rc2 |
3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 |
/* * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP * * When a FORWARD TSN chunk arrives, the data receiver MUST first update * its cumulative TSN point to the value carried in the FORWARD TSN * chunk, and then MUST further advance its cumulative TSN point locally * if possible. * After the above processing, the data receiver MUST stop reporting any * missing TSNs earlier than or equal to the new cumulative TSN point. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
3857 3858 3859 3860 3861 3862 |
enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3863 |
{ |
1da177e4c Linux-2.6.12-rc2 |
3864 |
struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599b sctp: remove the ... |
3865 |
struct sctp_chunk *chunk = arg; |
9fcb95a10 sctp: Avoid memor... |
3866 |
struct sctp_fwdtsn_skip *skip; |
1da177e4c Linux-2.6.12-rc2 |
3867 3868 3869 3870 3871 3872 |
__u16 len; __u32 tsn; if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
3873 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3874 |
} |
d15c9ede6 sctp: process fwd... |
3875 3876 |
if (!asoc->peer.prsctp_capable) return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3877 3878 |
/* Make sure that the FORWARD_TSN chunk has valid length. */ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk))) |
24cb81a6a sctp: Push struct... |
3879 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3880 3881 3882 3883 3884 3885 3886 3887 3888 |
commands); fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; chunk->subh.fwdtsn_hdr = fwdtsn_hdr; len = ntohs(chunk->chunk_hdr->length); len -= sizeof(struct sctp_chunkhdr); skb_pull(chunk->skb, len); tsn = ntohl(fwdtsn_hdr->new_cum_tsn); |
bb33381d0 net: sctp: rework... |
3889 3890 |
pr_debug("%s: TSN 0x%x ", __func__, tsn); |
1da177e4c Linux-2.6.12-rc2 |
3891 3892 3893 3894 3895 3896 |
/* The TSN is too high--silently discard the chunk and count on it * getting retransmitted later. */ if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) goto discard_noforce; |
9fcb95a10 sctp: Avoid memor... |
3897 3898 |
/* Silently discard the chunk if stream-id is not valid */ sctp_walk_fwdtsn(skip, chunk) { |
cee360ab4 sctp: define the ... |
3899 |
if (ntohs(skip->stream) >= asoc->stream.incnt) |
9fcb95a10 sctp: Avoid memor... |
3900 3901 |
goto discard_noforce; } |
1da177e4c Linux-2.6.12-rc2 |
3902 3903 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); if (len > sizeof(struct sctp_fwdtsn_hdr)) |
d808ad9ab [NET] SCTP: Fix w... |
3904 |
sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4c Linux-2.6.12-rc2 |
3905 |
SCTP_CHUNK(chunk)); |
d808ad9ab [NET] SCTP: Fix w... |
3906 |
|
1da177e4c Linux-2.6.12-rc2 |
3907 |
/* Count this as receiving DATA. */ |
9f70f46bd sctp: properly la... |
3908 |
if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4c Linux-2.6.12-rc2 |
3909 3910 3911 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); } |
d808ad9ab [NET] SCTP: Fix w... |
3912 |
|
1da177e4c Linux-2.6.12-rc2 |
3913 |
/* FIXME: For now send a SACK, but DATA processing may |
d808ad9ab [NET] SCTP: Fix w... |
3914 |
* send another. |
1da177e4c Linux-2.6.12-rc2 |
3915 3916 |
*/ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); |
1da177e4c Linux-2.6.12-rc2 |
3917 3918 3919 3920 3921 3922 |
return SCTP_DISPOSITION_CONSUME; discard_noforce: return SCTP_DISPOSITION_DISCARD; } |
172a1599b sctp: remove the ... |
3923 3924 3925 3926 3927 3928 3929 |
enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
3930 |
{ |
1da177e4c Linux-2.6.12-rc2 |
3931 |
struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599b sctp: remove the ... |
3932 |
struct sctp_chunk *chunk = arg; |
9fcb95a10 sctp: Avoid memor... |
3933 |
struct sctp_fwdtsn_skip *skip; |
1da177e4c Linux-2.6.12-rc2 |
3934 3935 3936 3937 3938 3939 |
__u16 len; __u32 tsn; if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
3940 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3941 |
} |
d15c9ede6 sctp: process fwd... |
3942 3943 |
if (!asoc->peer.prsctp_capable) return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
3944 3945 |
/* Make sure that the FORWARD_TSN chunk has a valid length. */ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk))) |
24cb81a6a sctp: Push struct... |
3946 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
3947 3948 3949 3950 3951 3952 3953 3954 3955 |
commands); fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; chunk->subh.fwdtsn_hdr = fwdtsn_hdr; len = ntohs(chunk->chunk_hdr->length); len -= sizeof(struct sctp_chunkhdr); skb_pull(chunk->skb, len); tsn = ntohl(fwdtsn_hdr->new_cum_tsn); |
bb33381d0 net: sctp: rework... |
3956 3957 |
pr_debug("%s: TSN 0x%x ", __func__, tsn); |
1da177e4c Linux-2.6.12-rc2 |
3958 3959 3960 3961 3962 3963 |
/* The TSN is too high--silently discard the chunk and count on it * getting retransmitted later. */ if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) goto gen_shutdown; |
9fcb95a10 sctp: Avoid memor... |
3964 3965 |
/* Silently discard the chunk if stream-id is not valid */ sctp_walk_fwdtsn(skip, chunk) { |
cee360ab4 sctp: define the ... |
3966 |
if (ntohs(skip->stream) >= asoc->stream.incnt) |
9fcb95a10 sctp: Avoid memor... |
3967 3968 |
goto gen_shutdown; } |
1da177e4c Linux-2.6.12-rc2 |
3969 3970 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); if (len > sizeof(struct sctp_fwdtsn_hdr)) |
d808ad9ab [NET] SCTP: Fix w... |
3971 |
sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4c Linux-2.6.12-rc2 |
3972 |
SCTP_CHUNK(chunk)); |
d808ad9ab [NET] SCTP: Fix w... |
3973 |
|
1da177e4c Linux-2.6.12-rc2 |
3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 |
/* Go a head and force a SACK, since we are shutting down. */ gen_shutdown: /* Implementor's Guide. * * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately * respond to each received packet containing one or more DATA chunk(s) * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer */ sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); |
d808ad9ab [NET] SCTP: Fix w... |
3986 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
3987 3988 3989 |
} /* |
25985edce Fix common misspe... |
3990 |
* SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d5980 [SCTP]: Implement... |
3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 |
* * The receiver MUST use the HMAC algorithm indicated in the HMAC * Identifier field. If this algorithm was not specified by the * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk * during association setup, the AUTH chunk and all chunks after it MUST * be discarded and an ERROR chunk SHOULD be sent with the error cause * defined in Section 4.1. * * If an endpoint with no shared key receives a Shared Key Identifier * other than 0, it MUST silently discard all authenticated chunks. If * the endpoint has at least one endpoint pair shared key for the peer, * it MUST use the key specified by the Shared Key Identifier if a * key has been configured for that Shared Key Identifier. If no * endpoint pair shared key has been configured for that Shared Key * Identifier, all authenticated chunks MUST be silently discarded. * * Verification Tag: 8.5 Verification Tag [Normal verification] * * The return value is the disposition of the chunk. */ |
4785c7ae1 sctp: remove the ... |
4011 |
static enum sctp_ierror sctp_sf_authenticate( |
172a1599b sctp: remove the ... |
4012 |
const struct sctp_association *asoc, |
172a1599b sctp: remove the ... |
4013 |
struct sctp_chunk *chunk) |
bbd0d5980 [SCTP]: Implement... |
4014 4015 |
{ struct sctp_authhdr *auth_hdr; |
172a1599b sctp: remove the ... |
4016 |
__u8 *save_digest, *digest; |
bbd0d5980 [SCTP]: Implement... |
4017 4018 4019 |
struct sctp_hmac *hmac; unsigned int sig_len; __u16 key_id; |
bbd0d5980 [SCTP]: Implement... |
4020 4021 4022 4023 |
/* Pull in the auth header, so we can do some more verification */ auth_hdr = (struct sctp_authhdr *)chunk->skb->data; chunk->subh.auth_hdr = auth_hdr; |
bb96dec74 sctp: remove the ... |
4024 |
skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d5980 [SCTP]: Implement... |
4025 |
|
02582e9bc treewide: fix typ... |
4026 |
/* Make sure that we support the HMAC algorithm from the auth |
bbd0d5980 [SCTP]: Implement... |
4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 |
* chunk. */ if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) return SCTP_IERROR_AUTH_BAD_HMAC; /* Make sure that the provided shared key identifier has been * configured */ key_id = ntohs(auth_hdr->shkey_id); if (key_id != asoc->active_key_id && !sctp_auth_get_shkey(asoc, key_id)) return SCTP_IERROR_AUTH_BAD_KEYID; /* Make sure that the length of the signature matches what * we expect. */ |
bb96dec74 sctp: remove the ... |
4043 4044 |
sig_len = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_auth_chunk); |
bbd0d5980 [SCTP]: Implement... |
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 |
hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); if (sig_len != hmac->hmac_len) return SCTP_IERROR_PROTO_VIOLATION; /* Now that we've done validation checks, we can compute and * verify the hmac. The steps involved are: * 1. Save the digest from the chunk. * 2. Zero out the digest in the chunk. * 3. Compute the new digest * 4. Compare saved and new digests. */ digest = auth_hdr->hmac; skb_pull(chunk->skb, sig_len); save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); if (!save_digest) goto nomem; memset(digest, 0, sig_len); sctp_auth_calculate_hmac(asoc, chunk->skb, |
bb96dec74 sctp: remove the ... |
4066 4067 |
(struct sctp_auth_chunk *)chunk->chunk_hdr, GFP_ATOMIC); |
bbd0d5980 [SCTP]: Implement... |
4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 |
/* Discard the packet if the digests do not match */ if (memcmp(save_digest, digest, sig_len)) { kfree(save_digest); return SCTP_IERROR_BAD_SIG; } kfree(save_digest); chunk->auth = 1; return SCTP_IERROR_NO_ERROR; nomem: return SCTP_IERROR_NOMEM; } |
172a1599b sctp: remove the ... |
4082 4083 4084 4085 4086 |
enum sctp_disposition sctp_sf_eat_auth(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
bbd0d5980 [SCTP]: Implement... |
4087 |
{ |
bbd0d5980 [SCTP]: Implement... |
4088 |
struct sctp_chunk *chunk = arg; |
4785c7ae1 sctp: remove the ... |
4089 |
struct sctp_authhdr *auth_hdr; |
bbd0d5980 [SCTP]: Implement... |
4090 |
struct sctp_chunk *err_chunk; |
4785c7ae1 sctp: remove the ... |
4091 |
enum sctp_ierror error; |
bbd0d5980 [SCTP]: Implement... |
4092 |
|
d2f19fa13 [SCTP]: Fix kerne... |
4093 4094 |
/* Make sure that the peer has AUTH capable */ if (!asoc->peer.auth_capable) |
24cb81a6a sctp: Push struct... |
4095 |
return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa13 [SCTP]: Fix kerne... |
4096 |
|
bbd0d5980 [SCTP]: Implement... |
4097 4098 4099 |
if (!sctp_vtag_verify(chunk, asoc)) { sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, SCTP_NULL()); |
24cb81a6a sctp: Push struct... |
4100 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d5980 [SCTP]: Implement... |
4101 4102 4103 4104 |
} /* Make sure that the AUTH chunk has valid length. */ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) |
24cb81a6a sctp: Push struct... |
4105 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d5980 [SCTP]: Implement... |
4106 4107 4108 |
commands); auth_hdr = (struct sctp_authhdr *)chunk->skb->data; |
3b54f1fd8 sctp: delay the a... |
4109 |
error = sctp_sf_authenticate(asoc, chunk); |
bbd0d5980 [SCTP]: Implement... |
4110 |
switch (error) { |
7fd71b1e0 sctp: Reduce swit... |
4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 |
case SCTP_IERROR_AUTH_BAD_HMAC: /* Generate the ERROR chunk and discard the rest * of the packet */ err_chunk = sctp_make_op_error(asoc, chunk, SCTP_ERROR_UNSUP_HMAC, &auth_hdr->hmac_id, sizeof(__u16), 0); if (err_chunk) { sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err_chunk)); } /* Fall Through */ case SCTP_IERROR_AUTH_BAD_KEYID: case SCTP_IERROR_BAD_SIG: |
24cb81a6a sctp: Push struct... |
4126 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e0 sctp: Reduce swit... |
4127 4128 |
case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6a sctp: Push struct... |
4129 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e0 sctp: Reduce swit... |
4130 4131 4132 4133 4134 4135 4136 |
commands); case SCTP_IERROR_NOMEM: return SCTP_DISPOSITION_NOMEM; default: /* Prevent gcc warnings */ break; |
bbd0d5980 [SCTP]: Implement... |
4137 |
} |
65b07e5d0 [SCTP]: API updat... |
4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 |
if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { struct sctp_ulpevent *ev; ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), SCTP_AUTH_NEWKEY, GFP_ATOMIC); if (!ev) return -ENOMEM; sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); } |
bbd0d5980 [SCTP]: Implement... |
4150 4151 4152 4153 |
return SCTP_DISPOSITION_CONSUME; } /* |
1da177e4c Linux-2.6.12-rc2 |
4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 |
* Process an unknown chunk. * * Section: 3.2. Also, 2.1 in the implementor's guide. * * Chunk Types are encoded such that the highest-order two bits specify * the action that must be taken if the processing endpoint does not * recognize the Chunk Type. * * 00 - Stop processing this SCTP packet and discard it, do not process * any further chunks within it. * * 01 - Stop processing this SCTP packet and discard it, do not process * any further chunks within it, and report the unrecognized * chunk in an 'Unrecognized Chunk Type'. * * 10 - Skip this chunk and continue processing. * * 11 - Skip this chunk and continue processing, but report in an ERROR * Chunk using the 'Unrecognized Chunk Type' cause of error. * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
4176 4177 4178 4179 4180 4181 |
enum sctp_disposition sctp_sf_unk_chunk(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4182 4183 4184 |
{ struct sctp_chunk *unk_chunk = arg; struct sctp_chunk *err_chunk; |
922dbc5be sctp: remove the ... |
4185 |
struct sctp_chunkhdr *hdr; |
1da177e4c Linux-2.6.12-rc2 |
4186 |
|
bb33381d0 net: sctp: rework... |
4187 4188 |
pr_debug("%s: processing unknown chunk id:%d ", __func__, type.chunk); |
1da177e4c Linux-2.6.12-rc2 |
4189 4190 |
if (!sctp_vtag_verify(unk_chunk, asoc)) |
24cb81a6a sctp: Push struct... |
4191 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
4192 4193 4194 4195 4196 |
/* Make sure that the chunk has a valid length. * Since we don't know the chunk type, we use a general * chunkhdr structure to make a comparison. */ |
922dbc5be sctp: remove the ... |
4197 |
if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6a sctp: Push struct... |
4198 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4c Linux-2.6.12-rc2 |
4199 4200 4201 4202 4203 |
commands); switch (type.chunk & SCTP_CID_ACTION_MASK) { case SCTP_CID_ACTION_DISCARD: /* Discard the packet. */ |
24cb81a6a sctp: Push struct... |
4204 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
4205 |
case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4c Linux-2.6.12-rc2 |
4206 4207 4208 4209 |
/* Generate an ERROR chunk as response. */ hdr = unk_chunk->chunk_hdr; err_chunk = sctp_make_op_error(asoc, unk_chunk, SCTP_ERROR_UNKNOWN_CHUNK, hdr, |
e2f036a97 sctp: rename WORD... |
4210 |
SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3e sctp: Fix malform... |
4211 |
0); |
1da177e4c Linux-2.6.12-rc2 |
4212 4213 4214 4215 |
if (err_chunk) { sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err_chunk)); } |
2e3216cd5 sctp: Follow secu... |
4216 4217 |
/* Discard the packet. */ |
24cb81a6a sctp: Push struct... |
4218 |
sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
4219 |
return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
4220 4221 4222 |
case SCTP_CID_ACTION_SKIP: /* Skip the chunk. */ return SCTP_DISPOSITION_DISCARD; |
1da177e4c Linux-2.6.12-rc2 |
4223 4224 4225 4226 4227 |
case SCTP_CID_ACTION_SKIP_ERR: /* Generate an ERROR chunk as response. */ hdr = unk_chunk->chunk_hdr; err_chunk = sctp_make_op_error(asoc, unk_chunk, SCTP_ERROR_UNKNOWN_CHUNK, hdr, |
e2f036a97 sctp: rename WORD... |
4228 |
SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3e sctp: Fix malform... |
4229 |
0); |
1da177e4c Linux-2.6.12-rc2 |
4230 4231 4232 4233 4234 4235 |
if (err_chunk) { sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err_chunk)); } /* Skip the chunk. */ return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 |
default: break; } return SCTP_DISPOSITION_DISCARD; } /* * Discard the chunk. * * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 * [Too numerous to mention...] * Verification Tag: No verification needed. * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
4257 4258 4259 4260 4261 4262 |
enum sctp_disposition sctp_sf_discard_chunk(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4263 |
{ |
ece25dfa0 SCTP: Clean up OO... |
4264 4265 4266 4267 4268 4269 |
struct sctp_chunk *chunk = arg; /* Make sure that the chunk has a valid length. * Since we don't know the chunk type, we use a general * chunkhdr structure to make a comparison. */ |
922dbc5be sctp: remove the ... |
4270 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
4271 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
4272 |
commands); |
bb33381d0 net: sctp: rework... |
4273 4274 |
pr_debug("%s: chunk:%d is discarded ", __func__, type.chunk); |
1da177e4c Linux-2.6.12-rc2 |
4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 |
return SCTP_DISPOSITION_DISCARD; } /* * Discard the whole packet. * * Section: 8.4 2) * * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST * silently discard the OOTB packet and take no further action. |
1da177e4c Linux-2.6.12-rc2 |
4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 |
* * Verification Tag: No verification necessary * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
4296 4297 4298 4299 4300 |
enum sctp_disposition sctp_sf_pdiscard(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4301 |
{ |
24cb81a6a sctp: Push struct... |
4302 |
SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4c Linux-2.6.12-rc2 |
4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 |
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); return SCTP_DISPOSITION_CONSUME; } /* * The other end is violating protocol. * * Section: Not specified * Verification Tag: Not specified * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * We simply tag the chunk as a violation. The state machine will log * the violation and continue. */ |
172a1599b sctp: remove the ... |
4323 4324 4325 4326 4327 4328 |
enum sctp_disposition sctp_sf_violation(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4329 |
{ |
ece25dfa0 SCTP: Clean up OO... |
4330 4331 4332 |
struct sctp_chunk *chunk = arg; /* Make sure that the chunk has a valid length. */ |
922dbc5be sctp: remove the ... |
4333 |
if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6a sctp: Push struct... |
4334 |
return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa0 SCTP: Clean up OO... |
4335 |
commands); |
1da177e4c Linux-2.6.12-rc2 |
4336 4337 |
return SCTP_DISPOSITION_VIOLATION; } |
1da177e4c Linux-2.6.12-rc2 |
4338 |
/* |
aecedeab6 SCTP: drop SACK i... |
4339 |
* Common function to handle a protocol violation. |
1da177e4c Linux-2.6.12-rc2 |
4340 |
*/ |
172a1599b sctp: remove the ... |
4341 4342 4343 4344 4345 4346 4347 4348 |
static enum sctp_disposition sctp_sf_abort_violation( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, void *arg, struct sctp_cmd_seq *commands, const __u8 *payload, const size_t paylen) |
1da177e4c Linux-2.6.12-rc2 |
4349 |
{ |
ece25dfa0 SCTP: Clean up OO... |
4350 |
struct sctp_packet *packet = NULL; |
1da177e4c Linux-2.6.12-rc2 |
4351 4352 |
struct sctp_chunk *chunk = arg; struct sctp_chunk *abort = NULL; |
1da177e4c Linux-2.6.12-rc2 |
4353 |
|
bbd0d5980 [SCTP]: Implement... |
4354 4355 4356 4357 4358 4359 4360 4361 |
/* SCTP-AUTH, Section 6.3: * It should be noted that if the receiver wants to tear * down an association in an authenticated way only, the * handling of malformed packets should not result in * tearing down the association. * * This means that if we only want to abort associations * in an authenticated way (i.e AUTH+ABORT), then we |
25985edce Fix common misspe... |
4362 |
* can't destroy this association just because the packet |
bbd0d5980 [SCTP]: Implement... |
4363 4364 4365 4366 |
* was malformed. */ if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) goto discard; |
9abed245a Fix memory leak i... |
4367 4368 4369 4370 |
/* Make the abort chunk. */ abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); if (!abort) goto nomem; |
ece25dfa0 SCTP: Clean up OO... |
4371 |
if (asoc) { |
f4ad85ca3 [SCTP]: Fix proto... |
4372 4373 4374 |
/* Treat INIT-ACK as a special case during COOKIE-WAIT. */ if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && !asoc->peer.i.init_tag) { |
cb1844c47 sctp: remove the ... |
4375 |
struct sctp_initack_chunk *initack; |
f4ad85ca3 [SCTP]: Fix proto... |
4376 |
|
cb1844c47 sctp: remove the ... |
4377 4378 |
initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) |
f4ad85ca3 [SCTP]: Fix proto... |
4379 4380 4381 4382 4383 4384 4385 4386 4387 |
abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; else { unsigned int inittag; inittag = ntohl(initack->init_hdr.init_tag); sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, SCTP_U32(inittag)); } } |
ece25dfa0 SCTP: Clean up OO... |
4388 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a24078 sctp: Make the mi... |
4389 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
4390 |
|
ece25dfa0 SCTP: Clean up OO... |
4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 |
if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNREFUSED)); sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); } else { sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); |
b01a24078 sctp: Make the mi... |
4403 |
SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa0 SCTP: Clean up OO... |
4404 |
} |
1da177e4c Linux-2.6.12-rc2 |
4405 |
} else { |
2ce955035 sctp: Make the ct... |
4406 |
packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa0 SCTP: Clean up OO... |
4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 |
if (!packet) goto nomem_pkt; if (sctp_test_T_bit(abort)) packet->vtag = ntohl(chunk->sctp_hdr->vtag); abort->skb->sk = ep->base.sk; sctp_packet_append_chunk(packet, abort); sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
b01a24078 sctp: Make the mi... |
4420 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
4421 |
} |
b01a24078 sctp: Make the mi... |
4422 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9ab [NET] SCTP: Fix w... |
4423 |
|
56eb82bb8 sctp: Fix SNMP nu... |
4424 |
discard: |
24cb81a6a sctp: Push struct... |
4425 |
sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
4426 |
return SCTP_DISPOSITION_ABORT; |
ece25dfa0 SCTP: Clean up OO... |
4427 4428 |
nomem_pkt: sctp_chunk_free(abort); |
1da177e4c Linux-2.6.12-rc2 |
4429 4430 4431 |
nomem: return SCTP_DISPOSITION_NOMEM; } |
aecedeab6 SCTP: drop SACK i... |
4432 4433 |
/* * Handle a protocol violation when the chunk length is invalid. |
025dfdafe trivial: fix then... |
4434 |
* "Invalid" length is identified as smaller than the minimal length a |
aecedeab6 SCTP: drop SACK i... |
4435 |
* given chunk can be. For example, a SACK chunk has invalid length |
d4d6c6148 sctp: remove the ... |
4436 |
* if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab6 SCTP: drop SACK i... |
4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 |
* * We inform the other end by sending an ABORT with a Protocol Violation * error code. * * Section: Not specified * Verification Tag: Nothing to do * Inputs * (endpoint, asoc, chunk) * * Outputs * (reply_msg, msg_up, counters) * * Generate an ABORT chunk and terminate the association. */ |
172a1599b sctp: remove the ... |
4451 4452 4453 4454 4455 4456 4457 |
static enum sctp_disposition sctp_sf_violation_chunklen( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
aecedeab6 SCTP: drop SACK i... |
4458 |
{ |
cb3f837ba sctp: fix checkpa... |
4459 |
static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab6 SCTP: drop SACK i... |
4460 |
|
24cb81a6a sctp: Push struct... |
4461 |
return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599b sctp: remove the ... |
4462 |
sizeof(err_str)); |
aecedeab6 SCTP: drop SACK i... |
4463 |
} |
6f4c618dd SCTP : Add paramt... |
4464 4465 |
/* * Handle a protocol violation when the parameter length is invalid. |
33c7cfdbb sctp: fix the com... |
4466 4467 4468 |
* If the length is smaller than the minimum length of a given parameter, * or accumulated length in multi parameters exceeds the end of the chunk, * the length is considered as invalid. |
6f4c618dd SCTP : Add paramt... |
4469 |
*/ |
172a1599b sctp: remove the ... |
4470 4471 4472 4473 4474 4475 4476 |
static enum sctp_disposition sctp_sf_violation_paramlen( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, void *ext, struct sctp_cmd_seq *commands) |
ba0166708 sctp: Fix kernel ... |
4477 |
{ |
ba0166708 sctp: Fix kernel ... |
4478 4479 |
struct sctp_paramhdr *param = ext; struct sctp_chunk *abort = NULL; |
172a1599b sctp: remove the ... |
4480 |
struct sctp_chunk *chunk = arg; |
6f4c618dd SCTP : Add paramt... |
4481 |
|
ba0166708 sctp: Fix kernel ... |
4482 4483 4484 4485 4486 4487 4488 4489 4490 |
if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) goto discard; /* Make the abort chunk. */ abort = sctp_make_violation_paramlen(asoc, chunk, param); if (!abort) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a24078 sctp: Make the mi... |
4491 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba0166708 sctp: Fix kernel ... |
4492 4493 4494 4495 4496 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); |
b01a24078 sctp: Make the mi... |
4497 4498 |
SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
ba0166708 sctp: Fix kernel ... |
4499 4500 |
discard: |
24cb81a6a sctp: Push struct... |
4501 |
sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba0166708 sctp: Fix kernel ... |
4502 4503 4504 |
return SCTP_DISPOSITION_ABORT; nomem: return SCTP_DISPOSITION_NOMEM; |
6f4c618dd SCTP : Add paramt... |
4505 |
} |
aecedeab6 SCTP: drop SACK i... |
4506 4507 4508 4509 4510 4511 |
/* Handle a protocol violation when the peer trying to advance the * cumulative tsn ack to a point beyond the max tsn currently sent. * * We inform the other end by sending an ABORT with a Protocol Violation * error code. */ |
172a1599b sctp: remove the ... |
4512 4513 4514 4515 4516 4517 4518 |
static enum sctp_disposition sctp_sf_violation_ctsn( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
aecedeab6 SCTP: drop SACK i... |
4519 |
{ |
cb3f837ba sctp: fix checkpa... |
4520 |
static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab6 SCTP: drop SACK i... |
4521 |
|
24cb81a6a sctp: Push struct... |
4522 |
return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599b sctp: remove the ... |
4523 |
sizeof(err_str)); |
aecedeab6 SCTP: drop SACK i... |
4524 |
} |
ece25dfa0 SCTP: Clean up OO... |
4525 |
/* Handle protocol violation of an invalid chunk bundling. For example, |
25985edce Fix common misspe... |
4526 |
* when we have an association and we receive bundled INIT-ACK, or |
ece25dfa0 SCTP: Clean up OO... |
4527 |
* SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edce Fix common misspe... |
4528 |
* statement from the specs. Additionally, there might be an attacker |
ece25dfa0 SCTP: Clean up OO... |
4529 4530 |
* on the path and we may not want to continue this communication. */ |
172a1599b sctp: remove the ... |
4531 4532 4533 4534 4535 4536 4537 |
static enum sctp_disposition sctp_sf_violation_chunk( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
ece25dfa0 SCTP: Clean up OO... |
4538 |
{ |
cb3f837ba sctp: fix checkpa... |
4539 |
static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa0 SCTP: Clean up OO... |
4540 4541 |
if (!asoc) |
24cb81a6a sctp: Push struct... |
4542 |
return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa0 SCTP: Clean up OO... |
4543 |
|
24cb81a6a sctp: Push struct... |
4544 |
return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599b sctp: remove the ... |
4545 |
sizeof(err_str)); |
ece25dfa0 SCTP: Clean up OO... |
4546 |
} |
1da177e4c Linux-2.6.12-rc2 |
4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 |
/*************************************************************************** * These are the state functions for handling primitive (Section 10) events. ***************************************************************************/ /* * sctp_sf_do_prm_asoc * * Section: 10.1 ULP-to-SCTP * B) Associate * * Format: ASSOCIATE(local SCTP instance name, destination transport addr, * outbound stream count) * -> association id [,destination transport addr list] [,outbound stream * count] * * This primitive allows the upper layer to initiate an association to a * specific peer endpoint. * * The peer endpoint shall be specified by one of the transport addresses * which defines the endpoint (see Section 1.4). If the local SCTP * instance has not been initialized, the ASSOCIATE is considered an * error. * [This is not relevant for the kernel implementation since we do all * initialization at boot time. It we hadn't initialized we wouldn't * get anywhere near this code.] * * An association id, which is a local handle to the SCTP association, * will be returned on successful establishment of the association. If * SCTP is not able to open an SCTP association with the peer endpoint, * an error is returned. * [In the kernel implementation, the struct sctp_association needs to * be created BEFORE causing this primitive to run.] * * Other association parameters may be returned, including the * complete destination transport addresses of the peer as well as the * outbound stream count of the local endpoint. One of the transport * address from the returned destination addresses will be selected by * the local endpoint as default primary path for sending SCTP packets * to this peer. The returned "destination transport addr list" can * be used by the ULP to change the default primary path or to force * sending a packet to a specific transport address. [All of this * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING * function.] * * Mandatory attributes: * * o local SCTP instance name - obtained from the INITIALIZE operation. * [This is the argument asoc.] * o destination transport addr - specified as one of the transport * addresses of the peer endpoint with which the association is to be * established. * [This is asoc->peer.active_path.] * o outbound stream count - the number of outbound streams the ULP * would like to open towards this peer endpoint. * [BUG: This is not currently implemented.] * Optional attributes: * * None. * * The return value is a disposition. */ |
172a1599b sctp: remove the ... |
4607 4608 4609 4610 4611 4612 |
enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4613 |
{ |
26ac8e5fe sctp: fix checkpa... |
4614 |
struct sctp_association *my_asoc; |
172a1599b sctp: remove the ... |
4615 |
struct sctp_chunk *repl; |
1da177e4c Linux-2.6.12-rc2 |
4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 |
/* The comment below says that we enter COOKIE-WAIT AFTER * sending the INIT, but that doesn't actually work in our * implementation... */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); /* RFC 2960 5.1 Normal Establishment of an Association * * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" * must provide its Verification Tag (Tag_A) in the Initiate * Tag field. Tag_A SHOULD be a random number in the range of * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... */ repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); if (!repl) goto nomem; |
405426f6c net: sctp: sctp_s... |
4635 4636 4637 |
/* Choose transport for INIT. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, SCTP_CHUNK(repl)); |
1da177e4c Linux-2.6.12-rc2 |
4638 4639 4640 |
/* Cast away the const modifier, as we want to just * rerun it through as a sideffect. */ |
ab38fb04c [SCTP]: Fix compi... |
4641 4642 |
my_asoc = (struct sctp_association *)asoc; sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); |
1da177e4c Linux-2.6.12-rc2 |
4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 |
/* After sending the INIT, "A" starts the T1-init timer and * enters the COOKIE-WAIT state. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Process the SEND primitive. * * Section: 10.1 ULP-to-SCTP * E) Send * * Format: SEND(association id, buffer address, byte count [,context] * [,stream id] [,life time] [,destination transport address] * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) * -> result * * This is the main method to send user data via SCTP. * * Mandatory attributes: * * o association id - local handle to the SCTP association * * o buffer address - the location where the user message to be * transmitted is stored; * * o byte count - The size of the user data in number of bytes; * * Optional attributes: * * o context - an optional 32 bit integer that will be carried in the * sending failure notification to the ULP if the transportation of * this User Message fails. * * o stream id - to indicate which stream to send the data on. If not * specified, stream 0 will be used. * * o life time - specifies the life time of the user data. The user data * will not be sent by SCTP after the life time expires. This * parameter can be used to avoid efforts to transmit stale * user messages. SCTP notifies the ULP if the data cannot be * initiated to transport (i.e. sent to the destination via SCTP's * send primitive) within the life time variable. However, the * user data will be transmitted if SCTP has attempted to transmit a * chunk before the life time expired. * * o destination transport address - specified as one of the destination * transport addresses of the peer endpoint to which this packet * should be sent. Whenever possible, SCTP should use this destination * transport address for sending the packets, instead of the current * primary path. * * o unorder flag - this flag, if present, indicates that the user * would like the data delivered in an unordered fashion to the peer * (i.e., the U flag is set to 1 on all DATA chunks carrying this * message). * * o no-bundle flag - instructs SCTP not to bundle this user data with * other outbound DATA chunks. SCTP MAY still bundle even when * this flag is present, when faced with network congestion. * * o payload protocol-id - A 32 bit unsigned integer that is to be * passed to the peer indicating the type of payload protocol data * being transmitted. This value is passed as opaque data by SCTP. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
4717 4718 4719 4720 4721 4722 |
enum sctp_disposition sctp_sf_do_prm_send(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4723 |
{ |
9c5c62be2 sctp: Send user m... |
4724 |
struct sctp_datamsg *msg = arg; |
1da177e4c Linux-2.6.12-rc2 |
4725 |
|
9c5c62be2 sctp: Send user m... |
4726 |
sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4c Linux-2.6.12-rc2 |
4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 |
return SCTP_DISPOSITION_CONSUME; } /* * Process the SHUTDOWN primitive. * * Section: 10.1: * C) Shutdown * * Format: SHUTDOWN(association id) * -> result * * Gracefully closes an association. Any locally queued user data * will be delivered to the peer. The association will be terminated only * after the peer acknowledges all the SCTP packets sent. A success code * will be returned on successful termination of the association. If * attempting to terminate the association results in a failure, an error * code shall be returned. * * Mandatory attributes: * * o association id - local handle to the SCTP association * * Optional attributes: * * None. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
4756 4757 4758 4759 4760 4761 4762 |
enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4763 |
{ |
172a1599b sctp: remove the ... |
4764 |
enum sctp_disposition disposition; |
1da177e4c Linux-2.6.12-rc2 |
4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 |
/* From 9.2 Shutdown of an Association * Upon receipt of the SHUTDOWN primitive from its upper * layer, the endpoint enters SHUTDOWN-PENDING state and * remains there until all outstanding data has been * acknowledged by its peer. The endpoint accepts no new data * from its upper layer, but retransmits data to the far end * if necessary to fill gaps. */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); |
1da177e4c Linux-2.6.12-rc2 |
4776 4777 |
disposition = SCTP_DISPOSITION_CONSUME; if (sctp_outq_is_empty(&asoc->outqueue)) { |
24cb81a6a sctp: Push struct... |
4778 |
disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4c Linux-2.6.12-rc2 |
4779 4780 |
arg, commands); } |
172a1599b sctp: remove the ... |
4781 |
|
1da177e4c Linux-2.6.12-rc2 |
4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 |
return disposition; } /* * Process the ABORT primitive. * * Section: 10.1: * C) Abort * * Format: Abort(association id [, cause code]) * -> result * * Ungracefully closes an association. Any locally queued user data * will be discarded and an ABORT chunk is sent to the peer. A success code * will be returned on successful abortion of the association. If * attempting to abort the association results in a failure, an error * code shall be returned. * * Mandatory attributes: * * o association id - local handle to the SCTP association * * Optional attributes: * * o cause code - reason of the abort to be passed to the peer * * None. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
4812 4813 4814 4815 4816 4817 4818 |
enum sctp_disposition sctp_sf_do_9_1_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4819 4820 4821 4822 4823 4824 4825 4826 4827 |
{ /* From 9.1 Abort of an Association * Upon receipt of the ABORT primitive from its upper * layer, the endpoint enters CLOSED state and * discard all outstanding data has been * acknowledged by its peer. The endpoint accepts no new data * from its upper layer, but retransmits data to the far end * if necessary to fill gaps. */ |
c164a9ba0 Fix sctp privileg... |
4828 |
struct sctp_chunk *abort = arg; |
1da177e4c Linux-2.6.12-rc2 |
4829 |
|
068d8bd33 sctp: sctp should... |
4830 4831 |
if (abort) sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
1da177e4c Linux-2.6.12-rc2 |
4832 4833 4834 4835 |
/* Even if we can't send the ABORT due to low memory delete the * TCB. This is a departure from our typical NOMEM handling. */ |
8de8c8738 [SCTP]: Set sk_er... |
4836 4837 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); |
1da177e4c Linux-2.6.12-rc2 |
4838 4839 |
/* Delete the established association. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
4840 |
SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4c Linux-2.6.12-rc2 |
4841 |
|
b01a24078 sctp: Make the mi... |
4842 4843 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
4844 |
|
649621e3d sctp: fix use-aft... |
4845 |
return SCTP_DISPOSITION_ABORT; |
1da177e4c Linux-2.6.12-rc2 |
4846 4847 4848 |
} /* We tried an illegal operation on an association which is closed. */ |
172a1599b sctp: remove the ... |
4849 4850 4851 4852 4853 4854 |
enum sctp_disposition sctp_sf_error_closed(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4855 4856 4857 4858 4859 4860 4861 4862 |
{ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); return SCTP_DISPOSITION_CONSUME; } /* We tried an illegal operation on an association which is shutting * down. */ |
172a1599b sctp: remove the ... |
4863 4864 4865 4866 4867 4868 4869 |
enum sctp_disposition sctp_sf_error_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 |
{ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-ESHUTDOWN)); return SCTP_DISPOSITION_CONSUME; } /* * sctp_cookie_wait_prm_shutdown * * Section: 4 Note: 2 * Verification Tag: * Inputs * (endpoint, asoc) * * The RFC does not explicitly address this issue, but is the route through the * state table when someone issues a shutdown while in COOKIE_WAIT state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
4890 4891 4892 4893 4894 4895 4896 |
enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4897 4898 4899 4900 4901 4902 |
{ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_CLOSED)); |
b01a24078 sctp: Make the mi... |
4903 |
SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4c Linux-2.6.12-rc2 |
4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 |
sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); return SCTP_DISPOSITION_DELETE_TCB; } /* * sctp_cookie_echoed_prm_shutdown * * Section: 4 Note: 2 * Verification Tag: * Inputs * (endpoint, asoc) * * The RFC does not explcitly address this issue, but is the route through the * state table when someone issues a shutdown while in COOKIE_ECHOED state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
4924 4925 4926 4927 4928 4929 4930 |
enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4931 4932 4933 4934 |
{ /* There is a single T1 timer, so we should be able to use * common function with the COOKIE-WAIT state. */ |
24cb81a6a sctp: Push struct... |
4935 |
return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 |
} /* * sctp_sf_cookie_wait_prm_abort * * Section: 4 Note: 2 * Verification Tag: * Inputs * (endpoint, asoc) * * The RFC does not explicitly address this issue, but is the route through the * state table when someone issues an abort while in COOKIE_WAIT state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
4952 4953 4954 4955 4956 4957 4958 |
enum sctp_disposition sctp_sf_cookie_wait_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
4959 |
{ |
c164a9ba0 Fix sctp privileg... |
4960 |
struct sctp_chunk *abort = arg; |
1da177e4c Linux-2.6.12-rc2 |
4961 4962 4963 4964 |
/* Stop T1-init timer */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); |
1da177e4c Linux-2.6.12-rc2 |
4965 |
|
068d8bd33 sctp: sctp should... |
4966 4967 |
if (abort) sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
1da177e4c Linux-2.6.12-rc2 |
4968 4969 4970 |
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_CLOSED)); |
b01a24078 sctp: Make the mi... |
4971 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4c Linux-2.6.12-rc2 |
4972 4973 4974 4975 |
/* Even if we can't send the ABORT due to low memory delete the * TCB. This is a departure from our typical NOMEM handling. */ |
8de8c8738 [SCTP]: Set sk_er... |
4976 4977 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNREFUSED)); |
1da177e4c Linux-2.6.12-rc2 |
4978 4979 |
/* Delete the established association. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b1 [SCTP]: SCTP_CMD_... |
4980 |
SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4c Linux-2.6.12-rc2 |
4981 |
|
649621e3d sctp: fix use-aft... |
4982 |
return SCTP_DISPOSITION_ABORT; |
1da177e4c Linux-2.6.12-rc2 |
4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 |
} /* * sctp_sf_cookie_echoed_prm_abort * * Section: 4 Note: 3 * Verification Tag: * Inputs * (endpoint, asoc) * * The RFC does not explcitly address this issue, but is the route through the * state table when someone issues an abort while in COOKIE_ECHOED state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
4999 5000 5001 5002 5003 5004 5005 |
enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5006 5007 5008 5009 |
{ /* There is a single T1 timer, so we should be able to use * common function with the COOKIE-WAIT state. */ |
24cb81a6a sctp: Push struct... |
5010 |
return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 |
} /* * sctp_sf_shutdown_pending_prm_abort * * Inputs * (endpoint, asoc) * * The RFC does not explicitly address this issue, but is the route through the * state table when someone issues an abort while in SHUTDOWN-PENDING state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
5025 5026 5027 5028 5029 5030 5031 |
enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5032 5033 5034 5035 |
{ /* Stop the T5-shutdown guard timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
24cb81a6a sctp: Push struct... |
5036 |
return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 |
} /* * sctp_sf_shutdown_sent_prm_abort * * Inputs * (endpoint, asoc) * * The RFC does not explicitly address this issue, but is the route through the * state table when someone issues an abort while in SHUTDOWN-SENT state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
5051 5052 5053 5054 5055 5056 5057 |
enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5058 5059 5060 5061 5062 5063 5064 5065 |
{ /* Stop the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); /* Stop the T5-shutdown guard timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
24cb81a6a sctp: Push struct... |
5066 |
return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 |
} /* * sctp_sf_cookie_echoed_prm_abort * * Inputs * (endpoint, asoc) * * The RFC does not explcitly address this issue, but is the route through the * state table when someone issues an abort while in COOKIE_ECHOED state. * * Outputs * (timers) */ |
172a1599b sctp: remove the ... |
5081 5082 5083 5084 5085 5086 5087 |
enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5088 5089 5090 5091 |
{ /* The same T2 timer, so we should be able to use * common function with the SHUTDOWN-SENT state. */ |
24cb81a6a sctp: Push struct... |
5092 |
return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 |
} /* * Process the REQUESTHEARTBEAT primitive * * 10.1 ULP-to-SCTP * J) Request Heartbeat * * Format: REQUESTHEARTBEAT(association id, destination transport address) * * -> result * * Instructs the local endpoint to perform a HeartBeat on the specified * destination transport address of the given association. The returned * result should indicate whether the transmission of the HEARTBEAT * chunk to the destination address is successful. * * Mandatory attributes: * * o association id - local handle to the SCTP association * * o destination transport address - the transport address of the * association on which a heartbeat should be issued. */ |
172a1599b sctp: remove the ... |
5117 |
enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6a sctp: Push struct... |
5118 |
struct net *net, |
1da177e4c Linux-2.6.12-rc2 |
5119 5120 |
const struct sctp_endpoint *ep, const struct sctp_association *asoc, |
bfc6f8270 sctp: remove the ... |
5121 |
const union sctp_subtype type, |
1da177e4c Linux-2.6.12-rc2 |
5122 |
void *arg, |
a85bbeb22 sctp: remove the ... |
5123 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5124 |
{ |
fb78525ae [SCTP]: Increment... |
5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 |
if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, (struct sctp_transport *)arg, commands)) return SCTP_DISPOSITION_NOMEM; /* * RFC 2960 (bis), section 8.3 * * D) Request an on-demand HEARTBEAT on a specific destination * transport address of a given association. * * The endpoint should increment the respective error counter of * the destination transport address each time a HEARTBEAT is sent * to that address and not acknowledged within one RTO. * */ |
7e99013a5 sctp: Fix broken ... |
5140 |
sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525ae [SCTP]: Increment... |
5141 5142 |
SCTP_TRANSPORT(arg)); return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
5143 5144 5145 5146 5147 5148 5149 |
} /* * ADDIP Section 4.1 ASCONF Chunk Procedures * When an endpoint has an ASCONF signaled change to be sent to the * remote endpoint it should do A1 to A9 */ |
172a1599b sctp: remove the ... |
5150 5151 5152 5153 5154 5155 |
enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5156 5157 5158 5159 5160 5161 5162 5163 5164 |
{ struct sctp_chunk *chunk = arg; sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); return SCTP_DISPOSITION_CONSUME; } |
7a090b045 sctp: add stream ... |
5165 |
/* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599b sctp: remove the ... |
5166 5167 5168 5169 5170 5171 |
enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
7a090b045 sctp: add stream ... |
5172 5173 5174 5175 5176 5177 |
{ struct sctp_chunk *chunk = arg; sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); return SCTP_DISPOSITION_CONSUME; } |
1da177e4c Linux-2.6.12-rc2 |
5178 5179 5180 5181 5182 |
/* * Ignore the primitive event * * The return value is the disposition of the primitive. */ |
172a1599b sctp: remove the ... |
5183 5184 5185 5186 5187 5188 5189 |
enum sctp_disposition sctp_sf_ignore_primitive( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5190 |
{ |
bb33381d0 net: sctp: rework... |
5191 5192 5193 |
pr_debug("%s: primitive type:%d is ignored ", __func__, type.primitive); |
1da177e4c Linux-2.6.12-rc2 |
5194 5195 5196 5197 5198 5199 5200 5201 |
return SCTP_DISPOSITION_DISCARD; } /*************************************************************************** * These are the state functions for the OTHER events. ***************************************************************************/ /* |
e1cdd553d sctp: implement e... |
5202 5203 5204 5205 5206 |
* When the SCTP stack has no more user data to send or retransmit, this * notification is given to the user. Also, at the time when a user app * subscribes to this event, if there is no data to be sent or * retransmit, the stack will immediately send up this notification. */ |
172a1599b sctp: remove the ... |
5207 5208 5209 5210 5211 5212 5213 |
enum sctp_disposition sctp_sf_do_no_pending_tsn( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
e1cdd553d sctp: implement e... |
5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 |
{ struct sctp_ulpevent *event; event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); if (!event) return SCTP_DISPOSITION_NOMEM; sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); return SCTP_DISPOSITION_CONSUME; } /* |
1da177e4c Linux-2.6.12-rc2 |
5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 |
* Start the shutdown negotiation. * * From Section 9.2: * Once all its outstanding data has been acknowledged, the endpoint * shall send a SHUTDOWN chunk to its peer including in the Cumulative * TSN Ack field the last sequential TSN it has received from the peer. * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT * state. If the timer expires, the endpoint must re-send the SHUTDOWN * with the updated last sequential TSN received from its peer. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
5239 5240 5241 5242 5243 5244 5245 |
enum sctp_disposition sctp_sf_do_9_2_start_shutdown( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 |
{ struct sctp_chunk *reply; /* Once all its outstanding data has been acknowledged, the * endpoint shall send a SHUTDOWN chunk to its peer including * in the Cumulative TSN Ack field the last sequential TSN it * has received from the peer. */ reply = sctp_make_shutdown(asoc, NULL); if (!reply) goto nomem; /* Set the transport for the SHUTDOWN chunk and the timeout for the * T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); /* It shall then start the T2-shutdown timer */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); |
536428a9b sctp: Fix to star... |
5266 5267 5268 5269 |
/* RFC 4960 Section 9.2 * The sender of the SHUTDOWN MAY also start an overall guard timer * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. */ |
f8d960524 sctp: Enforce ret... |
5270 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9b sctp: Fix to star... |
5271 |
SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
9f70f46bd sctp: properly la... |
5272 |
if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4c Linux-2.6.12-rc2 |
5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); /* and enter the SHUTDOWN-SENT state. */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); /* sctp-implguide 2.10 Issues with Heartbeating and failover * * HEARTBEAT ... is discontinued after sending either SHUTDOWN |
d808ad9ab [NET] SCTP: Fix w... |
5283 |
* or SHUTDOWN-ACK. |
1da177e4c Linux-2.6.12-rc2 |
5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 |
*/ sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Generate a SHUTDOWN ACK now that everything is SACK'd. * * From Section 9.2: * * If it has no more outstanding DATA chunks, the SHUTDOWN receiver * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the * endpoint must re-send the SHUTDOWN ACK. * * The return value is the disposition. */ |
172a1599b sctp: remove the ... |
5307 5308 5309 5310 5311 5312 5313 |
enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5314 |
{ |
172a1599b sctp: remove the ... |
5315 |
struct sctp_chunk *chunk = arg; |
1da177e4c Linux-2.6.12-rc2 |
5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 |
struct sctp_chunk *reply; /* There are 2 ways of getting here: * 1) called in response to a SHUTDOWN chunk * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. * * For the case (2), the arg parameter is set to NULL. We need * to check that we have a chunk before accessing it's fields. */ if (chunk) { if (!sctp_vtag_verify(chunk, asoc)) |
ac23e6813 sctp: fix the nam... |
5327 5328 |
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5329 5330 |
/* Make sure that the SHUTDOWN chunk has a valid length. */ |
ac23e6813 sctp: fix the nam... |
5331 5332 5333 5334 |
if (!sctp_chunk_length_valid( chunk, sizeof(struct sctp_shutdown_chunk))) return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, commands); |
1da177e4c Linux-2.6.12-rc2 |
5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 |
} /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver * shall send a SHUTDOWN ACK ... */ reply = sctp_make_shutdown_ack(asoc, chunk); if (!reply) goto nomem; /* Set the transport for the SHUTDOWN ACK chunk and the timeout for * the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); /* and start/restart a T2-shutdown timer of its own, */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); |
9f70f46bd sctp: properly la... |
5352 |
if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4c Linux-2.6.12-rc2 |
5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 |
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); /* Enter the SHUTDOWN-ACK-SENT state. */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); /* sctp-implguide 2.10 Issues with Heartbeating and failover * * HEARTBEAT ... is discontinued after sending either SHUTDOWN |
d808ad9ab [NET] SCTP: Fix w... |
5363 |
* or SHUTDOWN-ACK. |
1da177e4c Linux-2.6.12-rc2 |
5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 |
*/ sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * Ignore the event defined as other * * The return value is the disposition of the event. */ |
172a1599b sctp: remove the ... |
5380 5381 5382 5383 5384 5385 |
enum sctp_disposition sctp_sf_ignore_other(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5386 |
{ |
bb33381d0 net: sctp: rework... |
5387 5388 5389 |
pr_debug("%s: the event other type:%d is ignored ", __func__, type.other); |
1da177e4c Linux-2.6.12-rc2 |
5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 |
return SCTP_DISPOSITION_DISCARD; } /************************************************************ * These are the state functions for handling timeout events. ************************************************************/ /* * RTX Timeout * * Section: 6.3.3 Handle T3-rtx Expiration * * Whenever the retransmission timer T3-rtx expires for a destination * address, do the following: * [See below] * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
5408 5409 5410 5411 5412 5413 |
enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5414 5415 |
{ struct sctp_transport *transport = arg; |
b01a24078 sctp: Make the mi... |
5416 |
SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b04627 [SCTP]: Extend /p... |
5417 |
|
1da177e4c Linux-2.6.12-rc2 |
5418 |
if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5e sctp: start t5 ti... |
5419 5420 |
if (asoc->peer.zero_window_announced && asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { |
f8d960524 sctp: Enforce ret... |
5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 |
/* * We are here likely because the receiver had its rwnd * closed for a while and we have not been able to * transmit the locally queued data within the maximum * retransmission attempts limit. Start the T5 * shutdown guard timer to give the receiver one last * chance and some additional time to recover before * aborting. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); } else { sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a24078 sctp: Make the mi... |
5438 5439 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
f8d960524 sctp: Enforce ret... |
5440 5441 |
return SCTP_DISPOSITION_DELETE_TCB; } |
1da177e4c Linux-2.6.12-rc2 |
5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 |
} /* E1) For the destination address for which the timer * expires, adjust its ssthresh with rules defined in Section * 7.2.3 and set the cwnd <- MTU. */ /* E2) For the destination address for which the timer * expires, set RTO <- RTO * 2 ("back off the timer"). The * maximum value discussed in rule C7 above (RTO.max) may be * used to provide an upper bound to this doubling operation. */ /* E3) Determine how many of the earliest (i.e., lowest TSN) * outstanding DATA chunks for the address for which the * T3-rtx has expired will fit into a single packet, subject * to the MTU constraint for the path corresponding to the * destination transport address to which the retransmission * is being sent (this may be different from the address for * which the timer expires [see Section 6.4]). Call this * value K. Bundle and retransmit those K DATA chunks in a * single packet to the destination endpoint. * * Note: Any DATA chunks that were sent to the address for * which the T3-rtx timer expired but did not fit in one MTU * (rule E3 above), should be marked for retransmission and * sent as soon as cwnd allows (normally when a SACK arrives). */ |
1da177e4c Linux-2.6.12-rc2 |
5470 5471 |
/* Do some failure management (Section 8.2). */ sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); |
1845a579e [SCTP]: Strike th... |
5472 5473 |
/* NB: Rules E4 and F1 are implicit in R1. */ sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); |
1da177e4c Linux-2.6.12-rc2 |
5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 |
return SCTP_DISPOSITION_CONSUME; } /* * Generate delayed SACK on timeout * * Section: 6.2 Acknowledgement on Reception of DATA Chunks * * The guidelines on delayed acknowledgement algorithm specified in * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an * acknowledgement SHOULD be generated for at least every second packet * (not every second DATA chunk) received, and SHOULD be generated * within 200 ms of the arrival of any unacknowledged DATA chunk. In * some situations it may be beneficial for an SCTP transmitter to be * more conservative than the algorithms detailed in this document * allow. However, an SCTP transmitter MUST NOT be more aggressive than * the following algorithms allow. */ |
172a1599b sctp: remove the ... |
5492 5493 5494 5495 5496 5497 |
enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5498 |
{ |
b01a24078 sctp: Make the mi... |
5499 |
SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4c Linux-2.6.12-rc2 |
5500 5501 5502 5503 5504 |
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); return SCTP_DISPOSITION_CONSUME; } /* |
3f7a87d2f [SCTP] sctp_conne... |
5505 |
* sctp_sf_t1_init_timer_expire |
1da177e4c Linux-2.6.12-rc2 |
5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 |
* * Section: 4 Note: 2 * Verification Tag: * Inputs * (endpoint, asoc) * * RFC 2960 Section 4 Notes * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT * and re-start the T1-init timer without changing state. This MUST * be repeated up to 'Max.Init.Retransmits' times. After that, the * endpoint MUST abort the initialization process and report the * error to SCTP user. * |
3f7a87d2f [SCTP] sctp_conne... |
5519 5520 5521 5522 |
* Outputs * (timers, events) * */ |
172a1599b sctp: remove the ... |
5523 5524 5525 5526 5527 5528 5529 |
enum sctp_disposition sctp_sf_t1_init_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
3f7a87d2f [SCTP] sctp_conne... |
5530 |
{ |
172a1599b sctp: remove the ... |
5531 |
int attempts = asoc->init_err_counter + 1; |
3f7a87d2f [SCTP] sctp_conne... |
5532 5533 |
struct sctp_chunk *repl = NULL; struct sctp_bind_addr *bp; |
3f7a87d2f [SCTP] sctp_conne... |
5534 |
|
bb33381d0 net: sctp: rework... |
5535 5536 |
pr_debug("%s: timer T1 expired (INIT) ", __func__); |
b01a24078 sctp: Make the mi... |
5537 |
SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2f [SCTP] sctp_conne... |
5538 |
|
81845c21d [SCTP]: correct t... |
5539 |
if (attempts <= asoc->max_init_attempts) { |
3f7a87d2f [SCTP] sctp_conne... |
5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 |
bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); if (!repl) return SCTP_DISPOSITION_NOMEM; /* Choose transport for INIT. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, SCTP_CHUNK(repl)); /* Issue a sideeffect to do the needed accounting. */ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); } else { |
bb33381d0 net: sctp: rework... |
5555 5556 5557 5558 |
pr_debug("%s: giving up on INIT, attempts:%d " "max_init_attempts:%d ", __func__, attempts, asoc->max_init_attempts); |
8de8c8738 [SCTP]: Set sk_er... |
5559 5560 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
3f7a87d2f [SCTP] sctp_conne... |
5561 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b1 [SCTP]: SCTP_CMD_... |
5562 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2f [SCTP] sctp_conne... |
5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 |
return SCTP_DISPOSITION_DELETE_TCB; } return SCTP_DISPOSITION_CONSUME; } /* * sctp_sf_t1_cookie_timer_expire * * Section: 4 Note: 2 * Verification Tag: * Inputs * (endpoint, asoc) * * RFC 2960 Section 4 Notes * 3) If the T1-cookie timer expires, the endpoint MUST retransmit |
1da177e4c Linux-2.6.12-rc2 |
5579 5580 5581 5582 5583 5584 5585 5586 5587 |
* COOKIE ECHO and re-start the T1-cookie timer without changing * state. This MUST be repeated up to 'Max.Init.Retransmits' times. * After that, the endpoint MUST abort the initialization process and * report the error to SCTP user. * * Outputs * (timers, events) * */ |
172a1599b sctp: remove the ... |
5588 5589 5590 5591 5592 5593 5594 |
enum sctp_disposition sctp_sf_t1_cookie_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5595 |
{ |
3f7a87d2f [SCTP] sctp_conne... |
5596 |
int attempts = asoc->init_err_counter + 1; |
172a1599b sctp: remove the ... |
5597 |
struct sctp_chunk *repl = NULL; |
1da177e4c Linux-2.6.12-rc2 |
5598 |
|
bb33381d0 net: sctp: rework... |
5599 5600 |
pr_debug("%s: timer T1 expired (COOKIE-ECHO) ", __func__); |
b01a24078 sctp: Make the mi... |
5601 |
SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4c Linux-2.6.12-rc2 |
5602 |
|
81845c21d [SCTP]: correct t... |
5603 |
if (attempts <= asoc->max_init_attempts) { |
3f7a87d2f [SCTP] sctp_conne... |
5604 |
repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4c Linux-2.6.12-rc2 |
5605 |
if (!repl) |
3f7a87d2f [SCTP] sctp_conne... |
5606 |
return SCTP_DISPOSITION_NOMEM; |
1da177e4c Linux-2.6.12-rc2 |
5607 |
|
96cd0d3d7 sctp: enable cook... |
5608 5609 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, SCTP_CHUNK(repl)); |
1da177e4c Linux-2.6.12-rc2 |
5610 |
/* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2f [SCTP] sctp_conne... |
5611 5612 |
sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4c Linux-2.6.12-rc2 |
5613 5614 |
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); } else { |
8de8c8738 [SCTP]: Set sk_er... |
5615 5616 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
5617 |
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b1 [SCTP]: SCTP_CMD_... |
5618 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4c Linux-2.6.12-rc2 |
5619 5620 5621 5622 |
return SCTP_DISPOSITION_DELETE_TCB; } return SCTP_DISPOSITION_CONSUME; |
1da177e4c Linux-2.6.12-rc2 |
5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 |
} /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN * with the updated last sequential TSN received from its peer. * * An endpoint should limit the number of retransmissions of the * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. * If this threshold is exceeded the endpoint should destroy the TCB and * MUST report the peer endpoint unreachable to the upper layer (and * thus the association enters the CLOSED state). The reception of any * packet from its peer (i.e. as the peer sends all of its queued DATA * chunks) should clear the endpoint's retransmission count and restart * the T2-Shutdown timer, giving its peer ample opportunity to transmit * all of its queued DATA chunks that have not yet been sent. */ |
172a1599b sctp: remove the ... |
5638 5639 5640 5641 5642 5643 5644 |
enum sctp_disposition sctp_sf_t2_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5645 5646 |
{ struct sctp_chunk *reply = NULL; |
bb33381d0 net: sctp: rework... |
5647 5648 |
pr_debug("%s: timer T2 expired ", __func__); |
b01a24078 sctp: Make the mi... |
5649 |
SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b04627 [SCTP]: Extend /p... |
5650 |
|
58fbbed4f [SCTP]: extend ex... |
5651 |
((struct sctp_association *)asoc)->shutdown_retries++; |
1da177e4c Linux-2.6.12-rc2 |
5652 |
if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c8738 [SCTP]: Set sk_er... |
5653 5654 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
5655 5656 |
/* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
5657 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a24078 sctp: Make the mi... |
5658 5659 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 |
return SCTP_DISPOSITION_DELETE_TCB; } switch (asoc->state) { case SCTP_STATE_SHUTDOWN_SENT: reply = sctp_make_shutdown(asoc, NULL); break; case SCTP_STATE_SHUTDOWN_ACK_SENT: reply = sctp_make_shutdown_ack(asoc, NULL); break; default: BUG(); break; |
3ff50b799 [NET]: cleanup ex... |
5675 |
} |
1da177e4c Linux-2.6.12-rc2 |
5676 5677 5678 |
if (!reply) goto nomem; |
6345b1998 sctp: fix panic w... |
5679 5680 5681 5682 5683 5684 5685 |
/* Do some failure management (Section 8.2). * If we remove the transport an SHUTDOWN was last sent to, don't * do failure management. */ if (asoc->shutdown_last_sent_to) sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); |
1da177e4c Linux-2.6.12-rc2 |
5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 |
/* Set the transport for the SHUTDOWN/ACK chunk and the timeout for * the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); /* Restart the T2-shutdown timer. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); return SCTP_DISPOSITION_CONSUME; nomem: return SCTP_DISPOSITION_NOMEM; } /* * ADDIP Section 4.1 ASCONF CHunk Procedures * If the T4 RTO timer expires the endpoint should do B1 to B5 */ |
172a1599b sctp: remove the ... |
5706 5707 5708 5709 5710 5711 5712 |
enum sctp_disposition sctp_sf_t4_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5713 5714 5715 |
{ struct sctp_chunk *chunk = asoc->addip_last_asconf; struct sctp_transport *transport = chunk->transport; |
b01a24078 sctp: Make the mi... |
5716 |
SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b04627 [SCTP]: Extend /p... |
5717 |
|
1da177e4c Linux-2.6.12-rc2 |
5718 5719 5720 5721 |
/* ADDIP 4.1 B1) Increment the error counters and perform path failure * detection on the appropriate destination address as defined in * RFC2960 [5] section 8.1 and 8.2. */ |
10a43cea7 sctp: fix panic w... |
5722 5723 5724 |
if (transport) sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); |
1da177e4c Linux-2.6.12-rc2 |
5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 |
/* Reconfig T4 timer and transport. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); /* ADDIP 4.1 B2) Increment the association error counters and perform * endpoint failure detection on the association as defined in * RFC2960 [5] section 8.1 and 8.2. * association error counter is incremented in SCTP_CMD_STRIKE. */ if (asoc->overall_error_count >= asoc->max_retrans) { sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
8de8c8738 [SCTP]: Set sk_er... |
5737 5738 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
5739 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
5740 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a24078 sctp: Make the mi... |
5741 5742 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 |
return SCTP_DISPOSITION_ABORT; } /* ADDIP 4.1 B3) Back-off the destination address RTO value to which * the ASCONF chunk was sent by doubling the RTO timer value. * This is done in SCTP_CMD_STRIKE. */ /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible * choose an alternate destination address (please refer to RFC2960 * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this |
d808ad9ab [NET] SCTP: Fix w... |
5754 |
* chunk, it MUST be the same (including its serial number) as the last |
1da177e4c Linux-2.6.12-rc2 |
5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 |
* ASCONF sent. */ sctp_chunk_hold(asoc->addip_last_asconf); sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asoc->addip_last_asconf)); /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different * destination is selected, then the RTO used will be that of the new * destination address. */ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); return SCTP_DISPOSITION_CONSUME; } /* sctpimpguide-05 Section 2.12.2 * The sender of the SHUTDOWN MAY also start an overall guard timer * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. * At the expiration of this timer the sender SHOULD abort the association * by sending an ABORT chunk. */ |
172a1599b sctp: remove the ... |
5777 5778 5779 5780 5781 5782 5783 |
enum sctp_disposition sctp_sf_t5_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5784 5785 |
{ struct sctp_chunk *reply = NULL; |
bb33381d0 net: sctp: rework... |
5786 5787 |
pr_debug("%s: timer T5 expired ", __func__); |
b01a24078 sctp: Make the mi... |
5788 |
SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4c Linux-2.6.12-rc2 |
5789 5790 5791 5792 5793 5794 |
reply = sctp_make_abort(asoc, NULL, 0); if (!reply) goto nomem; sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
8de8c8738 [SCTP]: Set sk_er... |
5795 5796 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ETIMEDOUT)); |
1da177e4c Linux-2.6.12-rc2 |
5797 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
5798 |
SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4c Linux-2.6.12-rc2 |
5799 |
|
b01a24078 sctp: Make the mi... |
5800 5801 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
a1080a8b0 sctp: update SNMP... |
5802 |
|
1da177e4c Linux-2.6.12-rc2 |
5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 |
return SCTP_DISPOSITION_DELETE_TCB; nomem: return SCTP_DISPOSITION_NOMEM; } /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, * the association is automatically closed by starting the shutdown process. * The work that needs to be done is same as when SHUTDOWN is initiated by * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). */ |
172a1599b sctp: remove the ... |
5813 5814 5815 5816 5817 5818 5819 |
enum sctp_disposition sctp_sf_autoclose_timer_expire( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5820 |
{ |
172a1599b sctp: remove the ... |
5821 |
enum sctp_disposition disposition; |
1da177e4c Linux-2.6.12-rc2 |
5822 |
|
b01a24078 sctp: Make the mi... |
5823 |
SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b04627 [SCTP]: Extend /p... |
5824 |
|
1da177e4c Linux-2.6.12-rc2 |
5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 |
/* From 9.2 Shutdown of an Association * Upon receipt of the SHUTDOWN primitive from its upper * layer, the endpoint enters SHUTDOWN-PENDING state and * remains there until all outstanding data has been * acknowledged by its peer. The endpoint accepts no new data * from its upper layer, but retransmits data to the far end * if necessary to fill gaps. */ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); |
1da177e4c Linux-2.6.12-rc2 |
5835 5836 |
disposition = SCTP_DISPOSITION_CONSUME; if (sctp_outq_is_empty(&asoc->outqueue)) { |
24cb81a6a sctp: Push struct... |
5837 |
disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4c Linux-2.6.12-rc2 |
5838 5839 |
arg, commands); } |
172a1599b sctp: remove the ... |
5840 |
|
1da177e4c Linux-2.6.12-rc2 |
5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 |
return disposition; } /***************************************************************************** * These are sa state functions which could apply to all types of events. ****************************************************************************/ /* * This table entry is not implemented. * * Inputs * (endpoint, asoc, chunk) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
5856 5857 5858 5859 5860 |
enum sctp_disposition sctp_sf_not_impl(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 |
{ return SCTP_DISPOSITION_NOT_IMPL; } /* * This table entry represents a bug. * * Inputs * (endpoint, asoc, chunk) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
5873 5874 5875 5876 5877 |
enum sctp_disposition sctp_sf_bug(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 |
{ return SCTP_DISPOSITION_BUG; } /* * This table entry represents the firing of a timer in the wrong state. * Since timer deletion cannot be guaranteed a timer 'may' end up firing * when the association is in the wrong state. This event should * be ignored, so as to prevent any rearming of the timer. * * Inputs * (endpoint, asoc, chunk) * * The return value is the disposition of the chunk. */ |
172a1599b sctp: remove the ... |
5893 5894 5895 5896 5897 5898 |
enum sctp_disposition sctp_sf_timer_ignore(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const union sctp_subtype type, void *arg, struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
5899 |
{ |
bb33381d0 net: sctp: rework... |
5900 5901 |
pr_debug("%s: timer %d ignored ", __func__, type.chunk); |
1da177e4c Linux-2.6.12-rc2 |
5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 |
return SCTP_DISPOSITION_CONSUME; } /******************************************************************** * 2nd Level Abstractions ********************************************************************/ /* Pull the SACK chunk based on the SACK header. */ static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) { struct sctp_sackhdr *sack; |
172a1599b sctp: remove the ... |
5913 |
__u16 num_dup_tsns; |
1da177e4c Linux-2.6.12-rc2 |
5914 5915 |
unsigned int len; __u16 num_blocks; |
1da177e4c Linux-2.6.12-rc2 |
5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 |
/* Protect ourselves from reading too far into * the skb from a bogus sender. */ sack = (struct sctp_sackhdr *) chunk->skb->data; num_blocks = ntohs(sack->num_gap_ack_blocks); num_dup_tsns = ntohs(sack->num_dup_tsns); len = sizeof(struct sctp_sackhdr); len += (num_blocks + num_dup_tsns) * sizeof(__u32); if (len > chunk->skb->len) return NULL; skb_pull(chunk->skb, len); return sack; } /* Create an ABORT packet to be sent as a response, with the specified * error causes. */ |
172a1599b sctp: remove the ... |
5937 5938 5939 5940 5941 5942 |
static struct sctp_packet *sctp_abort_pkt_new( struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, struct sctp_chunk *chunk, const void *payload, size_t paylen) |
1da177e4c Linux-2.6.12-rc2 |
5943 5944 5945 |
{ struct sctp_packet *packet; struct sctp_chunk *abort; |
2ce955035 sctp: Make the ct... |
5946 |
packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4c Linux-2.6.12-rc2 |
5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 |
if (packet) { /* Make an ABORT. * The T bit will be set if the asoc is NULL. */ abort = sctp_make_abort(asoc, chunk, paylen); if (!abort) { sctp_ootb_pkt_free(packet); return NULL; } |
047a2428a [SCTP] Implement ... |
5957 5958 5959 5960 |
/* Reflect vtag if T-Bit is set */ if (sctp_test_T_bit(abort)) packet->vtag = ntohl(chunk->sctp_hdr->vtag); |
1da177e4c Linux-2.6.12-rc2 |
5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 |
/* Add specified error causes, i.e., payload, to the * end of the chunk. */ sctp_addto_chunk(abort, paylen, payload); /* Set the skb to the belonging sock for accounting. */ abort->skb->sk = ep->base.sk; sctp_packet_append_chunk(packet, abort); } return packet; } /* Allocate a packet for responding in the OOTB conditions. */ |
172a1599b sctp: remove the ... |
5977 5978 5979 5980 |
static struct sctp_packet *sctp_ootb_pkt_new( struct net *net, const struct sctp_association *asoc, const struct sctp_chunk *chunk) |
1da177e4c Linux-2.6.12-rc2 |
5981 |
{ |
1da177e4c Linux-2.6.12-rc2 |
5982 |
struct sctp_transport *transport; |
172a1599b sctp: remove the ... |
5983 5984 |
struct sctp_packet *packet; __u16 sport, dport; |
1da177e4c Linux-2.6.12-rc2 |
5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 |
__u32 vtag; /* Get the source and destination port from the inbound packet. */ sport = ntohs(chunk->sctp_hdr->dest); dport = ntohs(chunk->sctp_hdr->source); /* The V-tag is going to be the same as the inbound packet if no * association exists, otherwise, use the peer's vtag. */ if (asoc) { |
02c4e12c6 SCTP: Send ABORT ... |
5995 5996 5997 |
/* Special case the INIT-ACK as there is no peer's vtag * yet. */ |
cb3f837ba sctp: fix checkpa... |
5998 |
switch (chunk->chunk_hdr->type) { |
02c4e12c6 SCTP: Send ABORT ... |
5999 6000 |
case SCTP_CID_INIT_ACK: { |
cb1844c47 sctp: remove the ... |
6001 |
struct sctp_initack_chunk *initack; |
02c4e12c6 SCTP: Send ABORT ... |
6002 |
|
cb1844c47 sctp: remove the ... |
6003 |
initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c6 SCTP: Send ABORT ... |
6004 6005 6006 6007 6008 6009 6010 |
vtag = ntohl(initack->init_hdr.init_tag); break; } default: vtag = asoc->peer.i.init_tag; break; } |
1da177e4c Linux-2.6.12-rc2 |
6011 6012 6013 6014 |
} else { /* Special case the INIT and stale COOKIE_ECHO as there is no * vtag yet. */ |
cb3f837ba sctp: fix checkpa... |
6015 |
switch (chunk->chunk_hdr->type) { |
1da177e4c Linux-2.6.12-rc2 |
6016 6017 |
case SCTP_CID_INIT: { |
01a992bea sctp: remove the ... |
6018 |
struct sctp_init_chunk *init; |
1da177e4c Linux-2.6.12-rc2 |
6019 |
|
01a992bea sctp: remove the ... |
6020 |
init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4c Linux-2.6.12-rc2 |
6021 6022 6023 |
vtag = ntohl(init->init_hdr.init_tag); break; } |
d808ad9ab [NET] SCTP: Fix w... |
6024 |
default: |
1da177e4c Linux-2.6.12-rc2 |
6025 6026 6027 6028 6029 6030 |
vtag = ntohl(chunk->sctp_hdr->vtag); break; } } /* Make a transport for the bucket, Eliza... */ |
89bf3450c sctp: Push struct... |
6031 |
transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
6032 6033 6034 6035 6036 6037 |
if (!transport) goto nomem; /* Cache a route for the transport with the chunk's destination as * the source address. */ |
16b0a0303 [SCTP]: Switch sc... |
6038 |
sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce955035 sctp: Make the ct... |
6039 |
sctp_sk(net->sctp.ctl_sock)); |
1da177e4c Linux-2.6.12-rc2 |
6040 |
|
66b91d2cd sctp: remove retu... |
6041 6042 6043 |
packet = &transport->packet; sctp_packet_init(packet, transport, sport, dport); sctp_packet_config(packet, vtag, 0); |
1da177e4c Linux-2.6.12-rc2 |
6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 |
return packet; nomem: return NULL; } /* Free the packet allocated earlier for responding in the OOTB condition. */ void sctp_ootb_pkt_free(struct sctp_packet *packet) { sctp_transport_free(packet->transport); } /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ |
24cb81a6a sctp: Push struct... |
6058 6059 |
static void sctp_send_stale_cookie_err(struct net *net, const struct sctp_endpoint *ep, |
1da177e4c Linux-2.6.12-rc2 |
6060 6061 |
const struct sctp_association *asoc, const struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
6062 |
struct sctp_cmd_seq *commands, |
1da177e4c Linux-2.6.12-rc2 |
6063 6064 6065 6066 6067 |
struct sctp_chunk *err_chunk) { struct sctp_packet *packet; if (err_chunk) { |
2ce955035 sctp: Make the ct... |
6068 |
packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4c Linux-2.6.12-rc2 |
6069 6070 6071 6072 6073 6074 |
if (packet) { struct sctp_signed_cookie *cookie; /* Override the OOTB vtag from the cookie. */ cookie = chunk->subh.cookie_hdr; packet->vtag = cookie->c.peer_vtag; |
d808ad9ab [NET] SCTP: Fix w... |
6075 |
|
1da177e4c Linux-2.6.12-rc2 |
6076 6077 6078 6079 6080 |
/* Set the skb to the belonging sock for accounting. */ err_chunk->skb->sk = ep->base.sk; sctp_packet_append_chunk(packet, err_chunk); sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(packet)); |
b01a24078 sctp: Make the mi... |
6081 |
SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4c Linux-2.6.12-rc2 |
6082 6083 6084 6085 6086 6087 6088 6089 6090 |
} else sctp_chunk_free (err_chunk); } } /* Process a data chunk */ static int sctp_eat_data(const struct sctp_association *asoc, struct sctp_chunk *chunk, |
a85bbeb22 sctp: remove the ... |
6091 |
struct sctp_cmd_seq *commands) |
1da177e4c Linux-2.6.12-rc2 |
6092 |
{ |
7c3ceb4fb [SCTP]: Allow spi... |
6093 |
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5a [SCTP]: Include u... |
6094 |
struct sock *sk = asoc->base.sk; |
24cb81a6a sctp: Push struct... |
6095 |
struct net *net = sock_net(sk); |
172a1599b sctp: remove the ... |
6096 6097 6098 6099 |
struct sctp_datahdr *data_hdr; struct sctp_chunk *err; enum sctp_verb deliver; size_t datalen; |
f1751c57f sctp: Catch bogus... |
6100 |
u8 ordered = 0; |
172a1599b sctp: remove the ... |
6101 6102 6103 |
u16 ssn, sid; __u32 tsn; int tmp; |
1da177e4c Linux-2.6.12-rc2 |
6104 |
|
3583df1a3 sctp: remove the ... |
6105 6106 6107 |
data_hdr = (struct sctp_datahdr *)chunk->skb->data; chunk->subh.data_hdr = data_hdr; skb_pull(chunk->skb, sizeof(*data_hdr)); |
1da177e4c Linux-2.6.12-rc2 |
6108 6109 |
tsn = ntohl(data_hdr->tsn); |
bb33381d0 net: sctp: rework... |
6110 6111 |
pr_debug("%s: TSN 0x%x ", __func__, tsn); |
1da177e4c Linux-2.6.12-rc2 |
6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 |
/* ASSERT: Now skb->data is really the user data. */ /* Process ECN based congestion. * * Since the chunk structure is reused for all chunks within * a packet, we use ecn_ce_done to track if we've already * done CE processing for this packet. * * We need to do ECN processing even if we plan to discard the * chunk later. */ |
2d47fd120 sctp: only check ... |
6124 |
if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86d sctp: avoid ident... |
6125 |
struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4c Linux-2.6.12-rc2 |
6126 |
chunk->ecn_ce_done = 1; |
2d47fd120 sctp: only check ... |
6127 |
if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4c Linux-2.6.12-rc2 |
6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 |
/* Do real work as sideffect. */ sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, SCTP_U32(tsn)); } } tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); if (tmp < 0) { /* The TSN is too high--silently discard the chunk and * count on it getting retransmitted later. */ |
196d67593 sctp: Add support... |
6139 6140 |
if (chunk->asoc) chunk->asoc->stats.outofseqtsns++; |
1da177e4c Linux-2.6.12-rc2 |
6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 |
return SCTP_IERROR_HIGH_TSN; } else if (tmp > 0) { /* This is a duplicate. Record it. */ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); return SCTP_IERROR_DUP_TSN; } /* This is a new TSN. */ /* Discard if there is no room in the receive window. * Actually, allow a little bit of overflow (up to a MTU). */ datalen = ntohs(chunk->chunk_hdr->length); |
9f8d31471 sctp: remove the ... |
6154 |
datalen -= sizeof(struct sctp_data_chunk); |
1da177e4c Linux-2.6.12-rc2 |
6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 |
deliver = SCTP_CMD_CHUNK_ULP; /* Think about partial delivery. */ if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { /* Even if we don't accept this chunk there is * memory pressure. */ sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); } |
d808ad9ab [NET] SCTP: Fix w... |
6166 |
/* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4c Linux-2.6.12-rc2 |
6167 6168 6169 |
* seems a bit troublesome in that frag_point varies based on * PMTU. In cases, such as loopback, this might be a rather * large spill over. |
4d93df0ab [SCTP]: Rewrite o... |
6170 |
*/ |
362d52040 Revert "net: sctp... |
6171 |
if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0ab [SCTP]: Rewrite o... |
6172 |
(datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4c Linux-2.6.12-rc2 |
6173 6174 6175 6176 6177 6178 6179 |
/* If this is the next TSN, consider reneging to make * room. Note: Playing nice with a confused sender. A * malicious sender can still eat up all our buffer * space and in the future we may want to detect and * do more drastic reneging. */ |
7c3ceb4fb [SCTP]: Allow spi... |
6180 6181 |
if (sctp_tsnmap_has_gap(map) && (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d0 net: sctp: rework... |
6182 6183 |
pr_debug("%s: reneging for tsn:%u ", __func__, tsn); |
1da177e4c Linux-2.6.12-rc2 |
6184 6185 |
deliver = SCTP_CMD_RENEGE; } else { |
bb33381d0 net: sctp: rework... |
6186 6187 6188 |
pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d ", __func__, tsn, datalen, asoc->rwnd); |
1da177e4c Linux-2.6.12-rc2 |
6189 6190 6191 6192 6193 |
return SCTP_IERROR_IGNORE_TSN; } } /* |
4d93df0ab [SCTP]: Rewrite o... |
6194 6195 |
* Also try to renege to limit our memory usage in the event that * we are under memory pressure |
3ab224be6 [NET] CORE: Intro... |
6196 |
* If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0ab [SCTP]: Rewrite o... |
6197 6198 6199 6200 6201 |
* in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our * memory usage too much */ if (*sk->sk_prot_creator->memory_pressure) { if (sctp_tsnmap_has_gap(map) && |
f7010e614 sctp: fix checkpa... |
6202 |
(sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d0 net: sctp: rework... |
6203 6204 6205 |
pr_debug("%s: under pressure, reneging for tsn:%u ", __func__, tsn); |
4d93df0ab [SCTP]: Rewrite o... |
6206 6207 6208 6209 6210 |
deliver = SCTP_CMD_RENEGE; } } /* |
1da177e4c Linux-2.6.12-rc2 |
6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 |
* Section 3.3.10.9 No User Data (9) * * Cause of error * --------------- * No User Data: This error cause is returned to the originator of a * DATA chunk if a received DATA chunk has no user data. */ if (unlikely(0 == datalen)) { err = sctp_make_abort_no_data(asoc, chunk, tsn); if (err) { sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err)); } /* We are going to ABORT, so we might as well stop * processing the rest of the chunks in the packet. */ |
cb3f837ba sctp: fix checkpa... |
6227 |
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c8738 [SCTP]: Set sk_er... |
6228 6229 |
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); |
1da177e4c Linux-2.6.12-rc2 |
6230 |
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe2 [SCTP]: SCTP_CMD_... |
6231 |
SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a24078 sctp: Make the mi... |
6232 6233 |
SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4c Linux-2.6.12-rc2 |
6234 6235 |
return SCTP_IERROR_NO_DATA; } |
9faa730f1 [SCTP]: Set chunk... |
6236 |
chunk->data_accepted = 1; |
1da177e4c Linux-2.6.12-rc2 |
6237 6238 6239 |
/* Note: Some chunks may get overcounted (if we drop) or overcounted * if we renege and the chunk arrives again. */ |
196d67593 sctp: Add support... |
6240 |
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a24078 sctp: Make the mi... |
6241 |
SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d67593 sctp: Add support... |
6242 6243 6244 |
if (chunk->asoc) chunk->asoc->stats.iuodchunks++; } else { |
b01a24078 sctp: Make the mi... |
6245 |
SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d67593 sctp: Add support... |
6246 6247 |
if (chunk->asoc) chunk->asoc->stats.iodchunks++; |
f1751c57f sctp: Catch bogus... |
6248 6249 |
ordered = 1; } |
1da177e4c Linux-2.6.12-rc2 |
6250 6251 6252 6253 6254 6255 6256 6257 6258 |
/* RFC 2960 6.5 Stream Identifier and Stream Sequence Number * * If an endpoint receive a DATA chunk with an invalid stream * identifier, it shall acknowledge the reception of the DATA chunk * following the normal procedure, immediately send an ERROR chunk * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) * and discard the DATA chunk. */ |
f1751c57f sctp: Catch bogus... |
6259 |
sid = ntohs(data_hdr->stream); |
cee360ab4 sctp: define the ... |
6260 |
if (sid >= asoc->stream.incnt) { |
3888e9efc sctp: Mark the ts... |
6261 6262 |
/* Mark tsn as received even though we drop it */ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); |
1da177e4c Linux-2.6.12-rc2 |
6263 6264 |
err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, &data_hdr->stream, |
6383cfb3e sctp: Fix malform... |
6265 6266 |
sizeof(data_hdr->stream), sizeof(u16)); |
1da177e4c Linux-2.6.12-rc2 |
6267 6268 6269 6270 6271 |
if (err) sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(err)); return SCTP_IERROR_BAD_STREAM; } |
f1751c57f sctp: Catch bogus... |
6272 6273 6274 6275 6276 6277 6278 6279 |
/* Check to see if the SSN is possible for this TSN. * The biggest gap we can record is 4K wide. Since SSNs wrap * at an unsigned short, there is no way that an SSN can * wrap and for a valid TSN. We can simply check if the current * SSN is smaller then the next expected one. If it is, it wrapped * and is invalid. */ ssn = ntohs(data_hdr->ssn); |
cee360ab4 sctp: define the ... |
6280 |
if (ordered && SSN_lt(ssn, sctp_ssn_peek(&asoc->stream, in, sid))) |
f1751c57f sctp: Catch bogus... |
6281 |
return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57f sctp: Catch bogus... |
6282 |
|
1da177e4c Linux-2.6.12-rc2 |
6283 6284 6285 6286 6287 6288 6289 6290 |
/* Send the data up to the user. Note: Schedule the * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK * chunk needs the updated rwnd. */ sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); return SCTP_IERROR_NO_ERROR; } |