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net/netfilter/nf_conntrack_proto_dccp.c
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/* * DCCP connection tracking protocol helper * * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/sysctl.h> #include <linux/spinlock.h> #include <linux/skbuff.h> #include <linux/dccp.h> |
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#include <linux/slab.h> |
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#include <net/net_namespace.h> #include <net/netns/generic.h> |
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#include <linux/netfilter/nfnetlink_conntrack.h> #include <net/netfilter/nf_conntrack.h> #include <net/netfilter/nf_conntrack_l4proto.h> |
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#include <net/netfilter/nf_conntrack_ecache.h> |
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#include <net/netfilter/nf_log.h> |
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/* Timeouts are based on values from RFC4340: * * - REQUEST: * * 8.1.2. Client Request * * A client MAY give up on its DCCP-Requests after some time * (3 minutes, for example). * * - RESPOND: * * 8.1.3. Server Response * * It MAY also leave the RESPOND state for CLOSED after a timeout of * not less than 4MSL (8 minutes); * * - PARTOPEN: * * 8.1.5. Handshake Completion * * If the client remains in PARTOPEN for more than 4MSL (8 minutes), * it SHOULD reset the connection with Reset Code 2, "Aborted". * * - OPEN: * * The DCCP timestamp overflows after 11.9 hours. If the connection * stays idle this long the sequence number won't be recognized * as valid anymore. * * - CLOSEREQ/CLOSING: * * 8.3. Termination * * The retransmission timer should initially be set to go off in two * round-trip times and should back off to not less than once every * 64 seconds ... * * - TIMEWAIT: * * 4.3. States * * A server or client socket remains in this state for 2MSL (4 minutes) * after the connection has been town down, ... */ #define DCCP_MSL (2 * 60 * HZ) |
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static const char * const dccp_state_names[] = { [CT_DCCP_NONE] = "NONE", [CT_DCCP_REQUEST] = "REQUEST", [CT_DCCP_RESPOND] = "RESPOND", [CT_DCCP_PARTOPEN] = "PARTOPEN", [CT_DCCP_OPEN] = "OPEN", [CT_DCCP_CLOSEREQ] = "CLOSEREQ", [CT_DCCP_CLOSING] = "CLOSING", [CT_DCCP_TIMEWAIT] = "TIMEWAIT", [CT_DCCP_IGNORE] = "IGNORE", [CT_DCCP_INVALID] = "INVALID", }; #define sNO CT_DCCP_NONE #define sRQ CT_DCCP_REQUEST #define sRS CT_DCCP_RESPOND #define sPO CT_DCCP_PARTOPEN #define sOP CT_DCCP_OPEN #define sCR CT_DCCP_CLOSEREQ #define sCG CT_DCCP_CLOSING #define sTW CT_DCCP_TIMEWAIT #define sIG CT_DCCP_IGNORE #define sIV CT_DCCP_INVALID /* * DCCP state transistion table * * The assumption is the same as for TCP tracking: * * We are the man in the middle. All the packets go through us but might * get lost in transit to the destination. It is assumed that the destination * can't receive segments we haven't seen. * * The following states exist: * * NONE: Initial state, expecting Request * REQUEST: Request seen, waiting for Response from server * RESPOND: Response from server seen, waiting for Ack from client * PARTOPEN: Ack after Response seen, waiting for packet other than Response, * Reset or Sync from server * OPEN: Packet other than Response, Reset or Sync seen * CLOSEREQ: CloseReq from server seen, expecting Close from client * CLOSING: Close seen, expecting Reset * TIMEWAIT: Reset seen * IGNORE: Not determinable whether packet is valid * * Some states exist only on one side of the connection: REQUEST, RESPOND, * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to * the one it was in before. * * Packets are marked as ignored (sIG) if we don't know if they're valid * (for example a reincarnation of a connection we didn't notice is dead * already) and the server may send back a connection closing Reset or a * Response. They're also used for Sync/SyncAck packets, which we don't * care about. */ static const u_int8_t dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = { [CT_DCCP_ROLE_CLIENT] = { [DCCP_PKT_REQUEST] = { /* * sNO -> sRQ Regular Request * sRQ -> sRQ Retransmitted Request or reincarnation * sRS -> sRS Retransmitted Request (apparently Response * got lost after we saw it) or reincarnation * sPO -> sIG Ignore, conntrack might be out of sync * sOP -> sIG Ignore, conntrack might be out of sync * sCR -> sIG Ignore, conntrack might be out of sync * sCG -> sIG Ignore, conntrack might be out of sync * sTW -> sRQ Reincarnation * * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */ sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ, }, [DCCP_PKT_RESPONSE] = { /* * sNO -> sIV Invalid * sRQ -> sIG Ignore, might be response to ignored Request * sRS -> sIG Ignore, might be response to ignored Request * sPO -> sIG Ignore, might be response to ignored Request * sOP -> sIG Ignore, might be response to ignored Request * sCR -> sIG Ignore, might be response to ignored Request * sCG -> sIG Ignore, might be response to ignored Request * sTW -> sIV Invalid, reincarnation in reverse direction * goes through sRQ * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV, }, [DCCP_PKT_ACK] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN * sOP -> sOP Regular ACK, remain in OPEN * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.) * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV }, [DCCP_PKT_DATA] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.) * sOP -> sOP Regular Data packet * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.) * sCG -> sCG Data in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV, }, [DCCP_PKT_DATAACK] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) * sPO -> sPO Remain in PARTOPEN state * sOP -> sOP Regular DataAck packet in OPEN state * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.) * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV }, [DCCP_PKT_CLOSEREQ] = { /* * CLOSEREQ may only be sent by the server. * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, [DCCP_PKT_CLOSE] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sCG Client-initiated close * sOP -> sCG Client-initiated close * sCR -> sCG Close in response to CloseReq (8.3.) * sCG -> sCG Retransmit * sTW -> sIV Late retransmit, already in TIME_WAIT * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV }, [DCCP_PKT_RESET] = { /* * sNO -> sIV No connection * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.) * sRS -> sTW Response received without Request * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.) * sOP -> sTW Connection reset * sCR -> sTW Connection reset * sCG -> sTW Connection reset * sTW -> sIG Ignore (don't refresh timer) * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG }, [DCCP_PKT_SYNC] = { /* * We currently ignore Sync packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, [DCCP_PKT_SYNCACK] = { /* * We currently ignore SyncAck packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, }, [CT_DCCP_ROLE_SERVER] = { [DCCP_PKT_REQUEST] = { /* * sNO -> sIV Invalid * sRQ -> sIG Ignore, conntrack might be out of sync * sRS -> sIG Ignore, conntrack might be out of sync * sPO -> sIG Ignore, conntrack might be out of sync * sOP -> sIG Ignore, conntrack might be out of sync * sCR -> sIG Ignore, conntrack might be out of sync * sCG -> sIG Ignore, conntrack might be out of sync * sTW -> sRQ Reincarnation, must reverse roles * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ }, [DCCP_PKT_RESPONSE] = { /* * sNO -> sIV Response without Request * sRQ -> sRS Response to clients Request * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT) * sPO -> sIG Response to an ignored Request or late retransmit * sOP -> sIG Ignore, might be response to ignored Request * sCR -> sIG Ignore, might be response to ignored Request * sCG -> sIG Ignore, might be response to ignored Request * sTW -> sIV Invalid, Request from client in sTW moves to sRQ * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV }, [DCCP_PKT_ACK] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sOP Enter OPEN state (8.1.5.) * sOP -> sOP Regular Ack in OPEN state * sCR -> sIV Waiting for Close from client * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV }, [DCCP_PKT_DATA] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sOP Enter OPEN state (8.1.5.) * sOP -> sOP Regular Data packet in OPEN state * sCR -> sIV Waiting for Close from client * sCG -> sCG Data in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV }, [DCCP_PKT_DATAACK] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sOP Enter OPEN state (8.1.5.) * sOP -> sOP Regular DataAck in OPEN state * sCR -> sIV Waiting for Close from client * sCG -> sCG Data in CLOSING MAY be processed (8.3.) * sTW -> sIV * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV }, [DCCP_PKT_CLOSEREQ] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.) * sOP -> sCR CloseReq in OPEN state * sCR -> sCR Retransmit * sCG -> sCR Simultaneous close, client sends another Close * sTW -> sIV Already closed * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV }, [DCCP_PKT_CLOSE] = { /* * sNO -> sIV No connection * sRQ -> sIV No connection * sRS -> sIV No connection * sPO -> sOP -> sCG Move direcly to CLOSING * sOP -> sCG Move to CLOSING * sCR -> sIV Close after CloseReq is invalid * sCG -> sCG Retransmit * sTW -> sIV Already closed * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV }, [DCCP_PKT_RESET] = { /* * sNO -> sIV No connection * sRQ -> sTW Reset in response to Request * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.) * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.) * sOP -> sTW * sCR -> sTW * sCG -> sTW * sTW -> sIG Ignore (don't refresh timer) * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */ sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG }, [DCCP_PKT_SYNC] = { /* * We currently ignore Sync packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, [DCCP_PKT_SYNCACK] = { /* * We currently ignore SyncAck packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, }, }; |
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/* this module per-net specifics */ |
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static int dccp_net_id __read_mostly; |
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struct dccp_net { int dccp_loose; unsigned int dccp_timeout[CT_DCCP_MAX + 1]; #ifdef CONFIG_SYSCTL struct ctl_table_header *sysctl_header; struct ctl_table *sysctl_table; #endif }; static inline struct dccp_net *dccp_pernet(struct net *net) { return net_generic(net, dccp_net_id); } |
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static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, struct nf_conntrack_tuple *tuple) |
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{ struct dccp_hdr _hdr, *dh; dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); if (dh == NULL) |
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return false; |
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tuple->src.u.dccp.port = dh->dccph_sport; tuple->dst.u.dccp.port = dh->dccph_dport; |
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return true; |
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} |
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static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv, const struct nf_conntrack_tuple *tuple) |
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{ inv->src.u.dccp.port = tuple->dst.u.dccp.port; inv->dst.u.dccp.port = tuple->src.u.dccp.port; |
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return true; |
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} |
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static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, unsigned int dataoff) |
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{ |
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struct net *net = nf_ct_net(ct); |
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struct dccp_net *dn; |
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struct dccp_hdr _dh, *dh; const char *msg; u_int8_t state; dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); BUG_ON(dh == NULL); state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; switch (state) { default: |
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dn = dccp_pernet(net); if (dn->dccp_loose == 0) { |
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msg = "nf_ct_dccp: not picking up existing connection "; goto out_invalid; } case CT_DCCP_REQUEST: break; case CT_DCCP_INVALID: msg = "nf_ct_dccp: invalid state transition "; goto out_invalid; } ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; ct->proto.dccp.state = CT_DCCP_NONE; |
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return true; |
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out_invalid: |
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if (LOG_INVALID(net, IPPROTO_DCCP)) |
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nf_log_packet(nf_ct_l3num(ct), 0, skb, NULL, NULL, NULL, msg); |
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return false; |
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} static u64 dccp_ack_seq(const struct dccp_hdr *dh) { const struct dccp_hdr_ack_bits *dhack; dhack = (void *)dh + __dccp_basic_hdr_len(dh); return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); } static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, unsigned int dataoff, enum ip_conntrack_info ctinfo, |
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u_int8_t pf, unsigned int hooknum) |
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{ |
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struct net *net = nf_ct_net(ct); |
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struct dccp_net *dn; |
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); struct dccp_hdr _dh, *dh; u_int8_t type, old_state, new_state; enum ct_dccp_roles role; dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); BUG_ON(dh == NULL); type = dh->dccph_type; if (type == DCCP_PKT_RESET && !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { /* Tear down connection immediately if only reply is a RESET */ |
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nf_ct_kill_acct(ct, ctinfo, skb); |
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return NF_ACCEPT; } |
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spin_lock_bh(&ct->lock); |
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role = ct->proto.dccp.role[dir]; old_state = ct->proto.dccp.state; new_state = dccp_state_table[role][type][old_state]; switch (new_state) { case CT_DCCP_REQUEST: if (old_state == CT_DCCP_TIMEWAIT && role == CT_DCCP_ROLE_SERVER) { /* Reincarnation in the reverse direction: reopen and * reverse client/server roles. */ ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT; ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER; } break; case CT_DCCP_RESPOND: if (old_state == CT_DCCP_REQUEST) ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); break; case CT_DCCP_PARTOPEN: if (old_state == CT_DCCP_RESPOND && type == DCCP_PKT_ACK && dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq) set_bit(IPS_ASSURED_BIT, &ct->status); break; case CT_DCCP_IGNORE: /* * Connection tracking might be out of sync, so we ignore * packets that might establish a new connection and resync * if the server responds with a valid Response. */ if (ct->proto.dccp.last_dir == !dir && ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST && type == DCCP_PKT_RESPONSE) { ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT; ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER; ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); new_state = CT_DCCP_RESPOND; break; } ct->proto.dccp.last_dir = dir; ct->proto.dccp.last_pkt = type; |
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spin_unlock_bh(&ct->lock); |
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if (LOG_INVALID(net, IPPROTO_DCCP)) |
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nf_log_packet(pf, 0, skb, NULL, NULL, NULL, "nf_ct_dccp: invalid packet ignored "); return NF_ACCEPT; case CT_DCCP_INVALID: |
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spin_unlock_bh(&ct->lock); |
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if (LOG_INVALID(net, IPPROTO_DCCP)) |
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nf_log_packet(pf, 0, skb, NULL, NULL, NULL, "nf_ct_dccp: invalid state transition "); return -NF_ACCEPT; } ct->proto.dccp.last_dir = dir; ct->proto.dccp.last_pkt = type; ct->proto.dccp.state = new_state; |
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spin_unlock_bh(&ct->lock); |
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if (new_state != old_state) nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
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dn = dccp_pernet(net); nf_ct_refresh_acct(ct, ctinfo, skb, dn->dccp_timeout[new_state]); |
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return NF_ACCEPT; } |
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static int dccp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, unsigned int dataoff, enum ip_conntrack_info *ctinfo, |
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u_int8_t pf, unsigned int hooknum) |
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{ struct dccp_hdr _dh, *dh; unsigned int dccp_len = skb->len - dataoff; unsigned int cscov; const char *msg; dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); if (dh == NULL) { msg = "nf_ct_dccp: short packet "; goto out_invalid; } if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) || dh->dccph_doff * 4 > dccp_len) { msg = "nf_ct_dccp: truncated/malformed packet "; goto out_invalid; } cscov = dccp_len; if (dh->dccph_cscov) { cscov = (dh->dccph_cscov - 1) * 4; if (cscov > dccp_len) { msg = "nf_ct_dccp: bad checksum coverage "; goto out_invalid; } } |
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if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
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nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP, pf)) { msg = "nf_ct_dccp: bad checksum "; goto out_invalid; } if (dh->dccph_type >= DCCP_PKT_INVALID) { msg = "nf_ct_dccp: reserved packet type "; goto out_invalid; } return NF_ACCEPT; out_invalid: |
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if (LOG_INVALID(net, IPPROTO_DCCP)) |
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nf_log_packet(pf, 0, skb, NULL, NULL, NULL, msg); return -NF_ACCEPT; } static int dccp_print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple) { return seq_printf(s, "sport=%hu dport=%hu ", ntohs(tuple->src.u.dccp.port), ntohs(tuple->dst.u.dccp.port)); } |
440f0d588
|
611 |
static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
2bc780499
|
612 613 614 615 616 617 |
{ return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]); } #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
440f0d588
|
618 |
struct nf_conn *ct) |
2bc780499
|
619 620 |
{ struct nlattr *nest_parms; |
440f0d588
|
621 |
spin_lock_bh(&ct->lock); |
2bc780499
|
622 623 624 625 |
nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED); if (!nest_parms) goto nla_put_failure; NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state); |
71951b64a
|
626 627 |
NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_ROLE, ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]); |
a17c85984
|
628 629 |
NLA_PUT_BE64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ, cpu_to_be64(ct->proto.dccp.handshake_seq)); |
2bc780499
|
630 |
nla_nest_end(skb, nest_parms); |
440f0d588
|
631 |
spin_unlock_bh(&ct->lock); |
2bc780499
|
632 633 634 |
return 0; nla_put_failure: |
440f0d588
|
635 |
spin_unlock_bh(&ct->lock); |
2bc780499
|
636 637 638 639 640 |
return -1; } static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = { [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 }, |
71951b64a
|
641 |
[CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 }, |
a17c85984
|
642 |
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 }, |
2bc780499
|
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 |
}; static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct) { struct nlattr *attr = cda[CTA_PROTOINFO_DCCP]; struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1]; int err; if (!attr) return 0; err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr, dccp_nla_policy); if (err < 0) return err; if (!tb[CTA_PROTOINFO_DCCP_STATE] || |
71951b64a
|
660 661 662 |
!tb[CTA_PROTOINFO_DCCP_ROLE] || nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX || nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) { |
2bc780499
|
663 |
return -EINVAL; |
71951b64a
|
664 |
} |
2bc780499
|
665 |
|
440f0d588
|
666 |
spin_lock_bh(&ct->lock); |
2bc780499
|
667 |
ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]); |
71951b64a
|
668 669 670 671 672 673 674 |
if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) { ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; } else { ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER; ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT; } |
a17c85984
|
675 676 677 678 |
if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) { ct->proto.dccp.handshake_seq = be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ])); } |
440f0d588
|
679 |
spin_unlock_bh(&ct->lock); |
2bc780499
|
680 681 |
return 0; } |
a400c30ed
|
682 683 684 685 686 687 |
static int dccp_nlattr_size(void) { return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); } |
2bc780499
|
688 689 690 |
#endif #ifdef CONFIG_SYSCTL |
1546000fe
|
691 692 |
/* template, data assigned later */ static struct ctl_table dccp_sysctl_table[] = { |
2bc780499
|
693 |
{ |
2bc780499
|
694 |
.procname = "nf_conntrack_dccp_timeout_request", |
2bc780499
|
695 696 697 698 699 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
700 |
.procname = "nf_conntrack_dccp_timeout_respond", |
2bc780499
|
701 702 703 704 705 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
706 |
.procname = "nf_conntrack_dccp_timeout_partopen", |
2bc780499
|
707 708 709 710 711 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
712 |
.procname = "nf_conntrack_dccp_timeout_open", |
2bc780499
|
713 714 715 716 717 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
718 |
.procname = "nf_conntrack_dccp_timeout_closereq", |
2bc780499
|
719 720 721 722 723 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
724 |
.procname = "nf_conntrack_dccp_timeout_closing", |
2bc780499
|
725 726 727 728 729 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
730 |
.procname = "nf_conntrack_dccp_timeout_timewait", |
2bc780499
|
731 732 733 734 735 |
.maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { |
2bc780499
|
736 |
.procname = "nf_conntrack_dccp_loose", |
1546000fe
|
737 |
.maxlen = sizeof(int), |
2bc780499
|
738 739 740 |
.mode = 0644, .proc_handler = proc_dointvec, }, |
f8572d8f2
|
741 |
{ } |
2bc780499
|
742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 |
}; #endif /* CONFIG_SYSCTL */ static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { .l3proto = AF_INET, .l4proto = IPPROTO_DCCP, .name = "dccp", .pkt_to_tuple = dccp_pkt_to_tuple, .invert_tuple = dccp_invert_tuple, .new = dccp_new, .packet = dccp_packet, .error = dccp_error, .print_tuple = dccp_print_tuple, .print_conntrack = dccp_print_conntrack, #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) .to_nlattr = dccp_to_nlattr, |
a400c30ed
|
758 |
.nlattr_size = dccp_nlattr_size, |
2bc780499
|
759 760 |
.from_nlattr = nlattr_to_dccp, .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30ed
|
761 |
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
2bc780499
|
762 763 764 |
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif |
2bc780499
|
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 |
}; static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { .l3proto = AF_INET6, .l4proto = IPPROTO_DCCP, .name = "dccp", .pkt_to_tuple = dccp_pkt_to_tuple, .invert_tuple = dccp_invert_tuple, .new = dccp_new, .packet = dccp_packet, .error = dccp_error, .print_tuple = dccp_print_tuple, .print_conntrack = dccp_print_conntrack, #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) .to_nlattr = dccp_to_nlattr, |
5ff482940
|
780 |
.nlattr_size = dccp_nlattr_size, |
2bc780499
|
781 782 |
.from_nlattr = nlattr_to_dccp, .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30ed
|
783 |
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
2bc780499
|
784 785 786 |
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif |
1546000fe
|
787 788 789 790 |
}; static __net_init int dccp_net_init(struct net *net) { |
32b51f92d
|
791 |
struct dccp_net *dn = dccp_pernet(net); |
1546000fe
|
792 793 794 795 796 797 798 799 800 801 |
/* default values */ dn->dccp_loose = 1; dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL; dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL; dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL; dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ; dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ; dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ; dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL; |
2bc780499
|
802 |
#ifdef CONFIG_SYSCTL |
1546000fe
|
803 804 805 |
dn->sysctl_table = kmemdup(dccp_sysctl_table, sizeof(dccp_sysctl_table), GFP_KERNEL); if (!dn->sysctl_table) |
32b51f92d
|
806 |
return -ENOMEM; |
1546000fe
|
807 808 809 810 811 812 813 814 815 816 817 818 819 820 |
dn->sysctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST]; dn->sysctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND]; dn->sysctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN]; dn->sysctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN]; dn->sysctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ]; dn->sysctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING]; dn->sysctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT]; dn->sysctl_table[7].data = &dn->dccp_loose; dn->sysctl_header = register_net_sysctl_table(net, nf_net_netfilter_sysctl_path, dn->sysctl_table); if (!dn->sysctl_header) { kfree(dn->sysctl_table); |
32b51f92d
|
821 |
return -ENOMEM; |
1546000fe
|
822 |
} |
2bc780499
|
823 |
#endif |
1546000fe
|
824 825 |
return 0; |
1546000fe
|
826 827 828 829 830 831 832 833 834 |
} static __net_exit void dccp_net_exit(struct net *net) { struct dccp_net *dn = dccp_pernet(net); #ifdef CONFIG_SYSCTL unregister_net_sysctl_table(dn->sysctl_header); kfree(dn->sysctl_table); #endif |
1546000fe
|
835 836 837 838 839 |
} static struct pernet_operations dccp_net_ops = { .init = dccp_net_init, .exit = dccp_net_exit, |
32b51f92d
|
840 841 |
.id = &dccp_net_id, .size = sizeof(struct dccp_net), |
2bc780499
|
842 843 844 845 846 |
}; static int __init nf_conntrack_proto_dccp_init(void) { int err; |
32b51f92d
|
847 |
err = register_pernet_subsys(&dccp_net_ops); |
2bc780499
|
848 849 |
if (err < 0) goto err1; |
1546000fe
|
850 |
err = nf_conntrack_l4proto_register(&dccp_proto4); |
2bc780499
|
851 852 |
if (err < 0) goto err2; |
1546000fe
|
853 854 855 856 |
err = nf_conntrack_l4proto_register(&dccp_proto6); if (err < 0) goto err3; |
2bc780499
|
857 |
return 0; |
1546000fe
|
858 |
err3: |
2bc780499
|
859 |
nf_conntrack_l4proto_unregister(&dccp_proto4); |
1546000fe
|
860 |
err2: |
32b51f92d
|
861 |
unregister_pernet_subsys(&dccp_net_ops); |
2bc780499
|
862 863 864 865 866 867 |
err1: return err; } static void __exit nf_conntrack_proto_dccp_fini(void) { |
32b51f92d
|
868 |
unregister_pernet_subsys(&dccp_net_ops); |
2bc780499
|
869 870 871 872 873 874 875 876 877 878 |
nf_conntrack_l4proto_unregister(&dccp_proto6); nf_conntrack_l4proto_unregister(&dccp_proto4); } module_init(nf_conntrack_proto_dccp_init); module_exit(nf_conntrack_proto_dccp_fini); MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); MODULE_DESCRIPTION("DCCP connection tracking protocol helper"); MODULE_LICENSE("GPL"); |