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net/tipc/msg.h
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/* * net/tipc/msg.h: Include file for TIPC message header routines |
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* |
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* Copyright (c) 2000-2007, Ericsson AB |
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* Copyright (c) 2005-2008, Wind River Systems |
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* All rights reserved. * |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: * |
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* 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. |
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* |
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* Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. */ #ifndef _TIPC_MSG_H #define _TIPC_MSG_H |
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#include "core.h" |
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#define TIPC_VERSION 2 |
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#define SHORT_H_SIZE 24 /* Connected, in-cluster messages */ |
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#define DIR_MSG_H_SIZE 32 /* Directly addressed messages */ |
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#define LONG_H_SIZE 40 /* Named messages */ |
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#define MCAST_H_SIZE 44 /* Multicast messages */ |
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#define INT_H_SIZE 40 /* Internal messages */ #define MIN_H_SIZE 24 /* Smallest legal TIPC header size */ #define MAX_H_SIZE 60 /* Largest possible TIPC header size */ |
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#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE) |
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/* TIPC user data message header format, version 2 |
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- Fundamental definitions available to privileged TIPC users are located in tipc_msg.h. |
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- Remaining definitions available to TIPC internal users appear below. |
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*/ static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val) { m->hdr[w] = htonl(val); } static inline void msg_set_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask, u32 val) { |
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val = (val & mask) << pos; |
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mask = mask << pos; m->hdr[w] &= ~htonl(mask); m->hdr[w] |= htonl(val); |
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} |
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static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b) { u32 temp = msg->hdr[a]; msg->hdr[a] = msg->hdr[b]; msg->hdr[b] = temp; } |
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/* |
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* Word 0 */ static inline u32 msg_version(struct tipc_msg *m) { return msg_bits(m, 0, 29, 7); } |
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static inline void msg_set_version(struct tipc_msg *m) |
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{ |
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msg_set_bits(m, 0, 29, 7, TIPC_VERSION); |
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} static inline u32 msg_user(struct tipc_msg *m) { return msg_bits(m, 0, 25, 0xf); } static inline u32 msg_isdata(struct tipc_msg *m) { |
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return (msg_user(m) <= TIPC_CRITICAL_IMPORTANCE); |
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} |
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static inline void msg_set_user(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 0, 25, 0xf, n); } |
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static inline void msg_set_importance(struct tipc_msg *m, u32 i) |
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{ msg_set_user(m, i); } |
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static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n) |
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{ msg_set_bits(m, 0, 21, 0xf, n>>2); } |
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static inline int msg_non_seq(struct tipc_msg *m) |
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{ return msg_bits(m, 0, 20, 1); } |
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static inline void msg_set_non_seq(struct tipc_msg *m, u32 n) |
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{ |
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msg_set_bits(m, 0, 20, 1, n); |
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} |
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static inline int msg_dest_droppable(struct tipc_msg *m) |
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{ return msg_bits(m, 0, 19, 1); } |
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static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d) |
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{ msg_set_bits(m, 0, 19, 1, d); } |
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static inline int msg_src_droppable(struct tipc_msg *m) |
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{ return msg_bits(m, 0, 18, 1); } |
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static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d) |
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{ msg_set_bits(m, 0, 18, 1, d); } static inline void msg_set_size(struct tipc_msg *m, u32 sz) { m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz); } |
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/* |
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* Word 1 */ |
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static inline void msg_set_type(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 1, 29, 0x7, n); } |
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static inline void msg_set_errcode(struct tipc_msg *m, u32 err) |
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{ msg_set_bits(m, 1, 25, 0xf, err); } |
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static inline u32 msg_reroute_cnt(struct tipc_msg *m) |
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{ return msg_bits(m, 1, 21, 0xf); } |
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static inline void msg_incr_reroute_cnt(struct tipc_msg *m) |
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{ msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1); } |
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static inline void msg_reset_reroute_cnt(struct tipc_msg *m) |
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{ msg_set_bits(m, 1, 21, 0xf, 0); } static inline u32 msg_lookup_scope(struct tipc_msg *m) { return msg_bits(m, 1, 19, 0x3); } |
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static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 1, 19, 0x3, n); } |
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static inline u32 msg_bcast_ack(struct tipc_msg *m) { return msg_bits(m, 1, 0, 0xffff); } |
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static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 1, 0, 0xffff, n); } |
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/* |
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* Word 2 */ static inline u32 msg_ack(struct tipc_msg *m) { return msg_bits(m, 2, 16, 0xffff); } |
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static inline void msg_set_ack(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 2, 16, 0xffff, n); } static inline u32 msg_seqno(struct tipc_msg *m) { return msg_bits(m, 2, 0, 0xffff); } |
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static inline void msg_set_seqno(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 2, 0, 0xffff, n); } |
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/* * TIPC may utilize the "link ack #" and "link seq #" fields of a short * message header to hold the destination node for the message, since the * normal "dest node" field isn't present. This cache is only referenced * when required, so populating the cache of a longer message header is * harmless (as long as the header has the two link sequence fields present). * * Note: Host byte order is OK here, since the info never goes off-card. */ static inline u32 msg_destnode_cache(struct tipc_msg *m) { return m->hdr[2]; } static inline void msg_set_destnode_cache(struct tipc_msg *m, u32 dnode) { m->hdr[2] = dnode; } |
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/* |
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* Words 3-10 */ |
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static inline void msg_set_prevnode(struct tipc_msg *m, u32 a) |
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{ msg_set_word(m, 3, a); } |
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static inline void msg_set_origport(struct tipc_msg *m, u32 p) |
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{ msg_set_word(m, 4, p); } |
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static inline void msg_set_destport(struct tipc_msg *m, u32 p) |
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{ msg_set_word(m, 5, p); } |
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static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p) |
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{ msg_set_word(m, 5, p); } |
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static inline void msg_set_orignode(struct tipc_msg *m, u32 a) |
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{ msg_set_word(m, 6, a); } |
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static inline void msg_set_destnode(struct tipc_msg *m, u32 a) |
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{ msg_set_word(m, 7, a); } |
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static inline int msg_is_dest(struct tipc_msg *m, u32 d) |
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{ return(msg_short(m) || (msg_destnode(m) == d)); } static inline u32 msg_routed(struct tipc_msg *m) { if (likely(msg_short(m))) return 0; return(msg_destnode(m) ^ msg_orignode(m)) >> 11; } |
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static inline void msg_set_nametype(struct tipc_msg *m, u32 n) |
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{ msg_set_word(m, 8, n); } static inline u32 msg_transp_seqno(struct tipc_msg *m) { return msg_word(m, 8); } static inline void msg_set_timestamp(struct tipc_msg *m, u32 n) { msg_set_word(m, 8, n); } static inline u32 msg_timestamp(struct tipc_msg *m) { return msg_word(m, 8); } static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n) { msg_set_word(m, 8, n); } |
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static inline void msg_set_namelower(struct tipc_msg *m, u32 n) |
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{ msg_set_word(m, 9, n); } |
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static inline void msg_set_nameinst(struct tipc_msg *m, u32 n) |
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{ msg_set_namelower(m, n); } |
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static inline void msg_set_nameupper(struct tipc_msg *m, u32 n) |
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{ msg_set_word(m, 10, n); } static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m) { return (struct tipc_msg *)msg_data(m); } |
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/* TIPC internal message header format, version 2 |
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1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w0:|vers |msg usr|hdr sz |n|resrv| packet size | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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w1:|m typ| sequence gap | broadcast ack no | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w2:| link level ack no/bc_gap_from | seq no / bcast_gap_to | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w3:| previous node | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w4:| next sent broadcast/fragm no | next sent pkt/ fragm msg no | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w5:| session no |rsv=0|r|berid|link prio|netpl|p| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w6:| originating node | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w7:| destination node | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w8:| transport sequence number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ w9:| msg count / bcast tag | link tolerance | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \ \ / User Specific Data / \ \ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ NB: CONN_MANAGER use data message format. LINK_CONFIG has own format. |
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*/ |
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/* |
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* Internal users */ #define BCAST_PROTOCOL 5 #define MSG_BUNDLER 6 #define LINK_PROTOCOL 7 #define CONN_MANAGER 8 #define ROUTE_DISTRIBUTOR 9 #define CHANGEOVER_PROTOCOL 10 #define NAME_DISTRIBUTOR 11 #define MSG_FRAGMENTER 12 #define LINK_CONFIG 13 |
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#define DSC_H_SIZE 40 |
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/* |
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* Connection management protocol messages */ #define CONN_PROBE 0 #define CONN_PROBE_REPLY 1 #define CONN_ACK 2 |
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/* |
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* Name distributor messages */ #define PUBLICATION 0 #define WITHDRAWAL 1 |
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/* |
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* Word 1 */ static inline u32 msg_seq_gap(struct tipc_msg *m) { |
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return msg_bits(m, 1, 16, 0x1fff); |
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} static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n) { |
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msg_set_bits(m, 1, 16, 0x1fff, n); |
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} static inline u32 msg_req_links(struct tipc_msg *m) { return msg_bits(m, 1, 16, 0xfff); } |
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static inline void msg_set_req_links(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 1, 16, 0xfff, n); } |
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* Word 2 */ static inline u32 msg_dest_domain(struct tipc_msg *m) { return msg_word(m, 2); } |
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static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n) |
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{ msg_set_word(m, 2, n); } static inline u32 msg_bcgap_after(struct tipc_msg *m) { return msg_bits(m, 2, 16, 0xffff); } static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n) { msg_set_bits(m, 2, 16, 0xffff, n); } static inline u32 msg_bcgap_to(struct tipc_msg *m) { return msg_bits(m, 2, 0, 0xffff); } |
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static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 2, 0, 0xffff, n); } |
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/* |
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* Word 4 */ static inline u32 msg_last_bcast(struct tipc_msg *m) { return msg_bits(m, 4, 16, 0xffff); } static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n) { msg_set_bits(m, 4, 16, 0xffff, n); } static inline u32 msg_fragm_no(struct tipc_msg *m) { return msg_bits(m, 4, 16, 0xffff); } static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n) { msg_set_bits(m, 4, 16, 0xffff, n); } static inline u32 msg_next_sent(struct tipc_msg *m) { return msg_bits(m, 4, 0, 0xffff); } static inline void msg_set_next_sent(struct tipc_msg *m, u32 n) { msg_set_bits(m, 4, 0, 0xffff, n); } static inline u32 msg_long_msgno(struct tipc_msg *m) { return msg_bits(m, 4, 0, 0xffff); } static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n) { msg_set_bits(m, 4, 0, 0xffff, n); } static inline u32 msg_bc_netid(struct tipc_msg *m) { return msg_word(m, 4); } static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id) { msg_set_word(m, 4, id); } static inline u32 msg_link_selector(struct tipc_msg *m) { return msg_bits(m, 4, 0, 1); } static inline void msg_set_link_selector(struct tipc_msg *m, u32 n) { msg_set_bits(m, 4, 0, 1, (n & 1)); } |
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/* |
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* Word 5 */ static inline u32 msg_session(struct tipc_msg *m) { return msg_bits(m, 5, 16, 0xffff); } static inline void msg_set_session(struct tipc_msg *m, u32 n) { msg_set_bits(m, 5, 16, 0xffff, n); } static inline u32 msg_probe(struct tipc_msg *m) { return msg_bits(m, 5, 0, 1); } static inline void msg_set_probe(struct tipc_msg *m, u32 val) { msg_set_bits(m, 5, 0, 1, (val & 1)); } static inline char msg_net_plane(struct tipc_msg *m) { return msg_bits(m, 5, 1, 7) + 'A'; } static inline void msg_set_net_plane(struct tipc_msg *m, char n) { msg_set_bits(m, 5, 1, 7, (n - 'A')); } static inline u32 msg_linkprio(struct tipc_msg *m) { return msg_bits(m, 5, 4, 0x1f); } static inline void msg_set_linkprio(struct tipc_msg *m, u32 n) { msg_set_bits(m, 5, 4, 0x1f, n); } static inline u32 msg_bearer_id(struct tipc_msg *m) { return msg_bits(m, 5, 9, 0x7); } static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n) { msg_set_bits(m, 5, 9, 0x7, n); } static inline u32 msg_redundant_link(struct tipc_msg *m) { return msg_bits(m, 5, 12, 0x1); } static inline void msg_set_redundant_link(struct tipc_msg *m) { msg_set_bits(m, 5, 12, 0x1, 1); } static inline void msg_clear_redundant_link(struct tipc_msg *m) { msg_set_bits(m, 5, 12, 0x1, 0); } |
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/* |
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* Word 9 */ static inline u32 msg_msgcnt(struct tipc_msg *m) { return msg_bits(m, 9, 16, 0xffff); } static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n) { msg_set_bits(m, 9, 16, 0xffff, n); } static inline u32 msg_bcast_tag(struct tipc_msg *m) { return msg_bits(m, 9, 16, 0xffff); } static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n) { msg_set_bits(m, 9, 16, 0xffff, n); } |
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static inline u32 msg_max_pkt(struct tipc_msg *m) |
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{ return (msg_bits(m, 9, 16, 0xffff) * 4); } |
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static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n) |
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{ msg_set_bits(m, 9, 16, 0xffff, (n / 4)); } static inline u32 msg_link_tolerance(struct tipc_msg *m) { return msg_bits(m, 9, 0, 0xffff); } static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n) { msg_set_bits(m, 9, 0, 0xffff, n); } |
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/* |
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* Routing table message data */ static inline u32 msg_remote_node(struct tipc_msg *m) { return msg_word(m, msg_hdr_sz(m)/4); } static inline void msg_set_remote_node(struct tipc_msg *m, u32 a) { msg_set_word(m, msg_hdr_sz(m)/4, a); } |
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static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos) { msg_data(m)[pos + 4] = 1; } |
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/* |
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* Segmentation message types */ #define FIRST_FRAGMENT 0 #define FRAGMENT 1 #define LAST_FRAGMENT 2 |
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|
618 |
/* |
b97bf3fd8
|
619 620 621 622 623 624 |
* Link management protocol message types */ #define STATE_MSG 0 #define RESET_MSG 1 #define ACTIVATE_MSG 2 |
c43072852
|
625 |
/* |
b97bf3fd8
|
626 627 628 629 |
* Changeover tunnel message types */ #define DUPLICATE_MSG 0 #define ORIGINAL_MSG 1 |
c43072852
|
630 |
/* |
b97bf3fd8
|
631 632 633 634 635 636 637 |
* Routing table message types */ #define EXT_ROUTING_TABLE 0 #define LOCAL_ROUTING_TABLE 1 #define SLAVE_ROUTING_TABLE 2 #define ROUTE_ADDITION 3 #define ROUTE_REMOVAL 4 |
c43072852
|
638 |
/* |
b97bf3fd8
|
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 |
* Config protocol message types */ #define DSC_REQ_MSG 0 #define DSC_RESP_MSG 1 static inline u32 msg_tot_importance(struct tipc_msg *m) { if (likely(msg_isdata(m))) { if (likely(msg_orignode(m) == tipc_own_addr)) return msg_importance(m); return msg_importance(m) + 4; } if ((msg_user(m) == MSG_FRAGMENTER) && (msg_type(m) == FIRST_FRAGMENT)) return msg_importance(msg_get_wrapped(m)); return msg_importance(m); } |
c43072852
|
657 |
static inline void msg_init(struct tipc_msg *m, u32 user, u32 type, |
757152175
|
658 |
u32 hsize, u32 destnode) |
b97bf3fd8
|
659 660 661 662 663 664 665 666 |
{ memset(m, 0, hsize); msg_set_version(m); msg_set_user(m, user); msg_set_hdr_sz(m, hsize); msg_set_size(m, hsize); msg_set_prevnode(m, tipc_own_addr); msg_set_type(m, type); |
b97bf3fd8
|
667 668 669 670 671 |
if (!msg_short(m)) { msg_set_orignode(m, tipc_own_addr); msg_set_destnode(m, destnode); } } |
c43072852
|
672 |
/** |
b97bf3fd8
|
673 674 675 676 677 678 679 680 681 682 683 684 |
* msg_calc_data_size - determine total data size for message */ static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect) { int dsz = 0; int i; for (i = 0; i < num_sect; i++) dsz += msg_sect[i].iov_len; return dsz; } |
c43072852
|
685 |
/** |
b97bf3fd8
|
686 |
* msg_build - create message using specified header and data |
c43072852
|
687 |
* |
b97bf3fd8
|
688 |
* Note: Caller must not hold any locks in case copy_from_user() is interrupted! |
c43072852
|
689 |
* |
b97bf3fd8
|
690 691 |
* Returns message data size or errno */ |
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|
692 |
static inline int msg_build(struct tipc_msg *hdr, |
b97bf3fd8
|
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 |
struct iovec const *msg_sect, u32 num_sect, int max_size, int usrmem, struct sk_buff** buf) { int dsz, sz, hsz, pos, res, cnt; dsz = msg_calc_data_size(msg_sect, num_sect); if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) { *buf = NULL; return -EINVAL; } pos = hsz = msg_hdr_sz(hdr); sz = hsz + dsz; msg_set_size(hdr, sz); if (unlikely(sz > max_size)) { *buf = NULL; return dsz; } *buf = buf_acquire(sz); if (!(*buf)) return -ENOMEM; |
27d7ff46a
|
715 |
skb_copy_to_linear_data(*buf, hdr, hsz); |
b97bf3fd8
|
716 717 |
for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) { if (likely(usrmem)) |
c43072852
|
718 719 |
res = !copy_from_user((*buf)->data + pos, msg_sect[cnt].iov_base, |
b97bf3fd8
|
720 721 |
msg_sect[cnt].iov_len); else |
27d7ff46a
|
722 723 724 |
skb_copy_to_linear_data_offset(*buf, pos, msg_sect[cnt].iov_base, msg_sect[cnt].iov_len); |
b97bf3fd8
|
725 726 727 728 729 730 731 732 733 |
pos += msg_sect[cnt].iov_len; } if (likely(res)) return dsz; buf_discard(*buf); *buf = NULL; return -EFAULT; } |
4323add67
|
734 735 736 737 |
static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a) { memcpy(&((int *)m)[5], a, sizeof(*a)); } |
b97bf3fd8
|
738 |
|
4323add67
|
739 740 741 742 |
static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a) { memcpy(a, &((int*)m)[5], sizeof(*a)); } |
b97bf3fd8
|
743 744 |
#endif |