2 * net/tipc/msg.h: Include file for TIPC message header routines
4 * Copyright (c) 2000-2007, 2014-2017 Ericsson AB
5 * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include <linux/tipc.h>
44 * Constants and routines used to read and write TIPC payload message headers
46 * Note: Some items are also used with TIPC internal message headers
48 #define TIPC_VERSION 2
52 * Payload message users are defined in TIPC's public API:
53 * - TIPC_LOW_IMPORTANCE
54 * - TIPC_MEDIUM_IMPORTANCE
55 * - TIPC_HIGH_IMPORTANCE
56 * - TIPC_CRITICAL_IMPORTANCE
58 #define TIPC_SYSTEM_IMPORTANCE 4
62 * Payload message types
64 #define TIPC_CONN_MSG 0
65 #define TIPC_MCAST_MSG 1
66 #define TIPC_NAMED_MSG 2
67 #define TIPC_DIRECT_MSG 3
68 #define TIPC_GRP_MEMBER_EVT 4
69 #define TIPC_GRP_BCAST_MSG 5
70 #define TIPC_GRP_MCAST_MSG 6
71 #define TIPC_GRP_UCAST_MSG 7
74 * Internal message users
76 #define BCAST_PROTOCOL 5
78 #define LINK_PROTOCOL 7
79 #define CONN_MANAGER 8
80 #define GROUP_PROTOCOL 9
81 #define TUNNEL_PROTOCOL 10
82 #define NAME_DISTRIBUTOR 11
83 #define MSG_FRAGMENTER 12
84 #define LINK_CONFIG 13
85 #define SOCK_WAKEUP 14 /* pseudo user */
86 #define TOP_SRV 15 /* pseudo user */
89 * Message header sizes
91 #define SHORT_H_SIZE 24 /* In-cluster basic payload message */
92 #define BASIC_H_SIZE 32 /* Basic payload message */
93 #define NAMED_H_SIZE 40 /* Named payload message */
94 #define MCAST_H_SIZE 44 /* Multicast payload message */
95 #define GROUP_H_SIZE 44 /* Group payload message */
96 #define INT_H_SIZE 40 /* Internal messages */
97 #define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
98 #define MAX_H_SIZE 60 /* Largest possible TIPC header size */
100 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
102 #define TIPC_MEDIA_INFO_OFFSET 5
107 struct sk_buff *tail;
108 unsigned long nxt_retr;
109 unsigned long retr_stamp;
116 #ifdef CONFIG_TIPC_CRYPTO
118 struct tipc_crypto *rx;
119 struct tipc_aead *last;
121 } tx_clone_ctx __packed;
127 #ifdef CONFIG_TIPC_CRYPTO
131 u8 tx_clone_deferred:1;
137 #ifdef CONFIG_TIPC_CRYPTO
142 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
148 /* struct tipc_gap_ack - TIPC Gap ACK block
149 * @ack: seqno of the last consecutive packet in link deferdq
150 * @gap: number of gap packets since the last ack
153 * link deferdq: 1 2 3 4 10 11 13 14 15 20
154 * --> Gap ACK blocks: <4, 5>, <11, 1>, <15, 4>, <20, 0>
156 struct tipc_gap_ack {
161 /* struct tipc_gap_ack_blks
162 * @len: actual length of the record
163 * @ugack_cnt: number of Gap ACK blocks for unicast (following the broadcast
165 * @start_index: starting index for "valid" broadcast Gap ACK blocks
166 * @bgack_cnt: number of Gap ACK blocks for broadcast in the record
167 * @gacks: array of Gap ACK blocks
170 * +-------------+-------------+-------------+-------------+
171 * | bgack_cnt | ugack_cnt | len |
172 * +-------------+-------------+-------------+-------------+ -
174 * +-------------+-------------+-------------+-------------+ > bc gacks
176 * +-------------+-------------+-------------+-------------+ -
178 * +-------------+-------------+-------------+-------------+ > uc gacks
180 * +-------------+-------------+-------------+-------------+ -
182 struct tipc_gap_ack_blks {
189 struct tipc_gap_ack gacks[];
192 #define tipc_gap_ack_blks_sz(n) (sizeof(struct tipc_gap_ack_blks) + \
193 sizeof(struct tipc_gap_ack) * (n))
195 #define MAX_GAP_ACK_BLKS 128
196 #define MAX_GAP_ACK_BLKS_SZ tipc_gap_ack_blks_sz(MAX_GAP_ACK_BLKS)
198 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
200 return (struct tipc_msg *)skb->data;
203 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
205 return ntohl(m->hdr[pos]);
208 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
210 m->hdr[w] = htonl(val);
213 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
215 return (msg_word(m, w) >> pos) & mask;
218 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
219 u32 pos, u32 mask, u32 val)
221 val = (val & mask) << pos;
223 m->hdr[w] &= ~htonl(mask);
224 m->hdr[w] |= htonl(val);
227 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
229 u32 temp = msg->hdr[a];
231 msg->hdr[a] = msg->hdr[b];
238 static inline u32 msg_version(struct tipc_msg *m)
240 return msg_bits(m, 0, 29, 7);
243 static inline void msg_set_version(struct tipc_msg *m)
245 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
248 static inline u32 msg_user(struct tipc_msg *m)
250 return msg_bits(m, 0, 25, 0xf);
253 static inline u32 msg_isdata(struct tipc_msg *m)
255 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
258 static inline void msg_set_user(struct tipc_msg *m, u32 n)
260 msg_set_bits(m, 0, 25, 0xf, n);
263 static inline u32 msg_hdr_sz(struct tipc_msg *m)
265 return msg_bits(m, 0, 21, 0xf) << 2;
268 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
270 msg_set_bits(m, 0, 21, 0xf, n>>2);
273 static inline u32 msg_size(struct tipc_msg *m)
275 return msg_bits(m, 0, 0, 0x1ffff);
278 static inline u32 msg_blocks(struct tipc_msg *m)
280 return (msg_size(m) / 1024) + 1;
283 static inline u32 msg_data_sz(struct tipc_msg *m)
285 return msg_size(m) - msg_hdr_sz(m);
288 static inline int msg_non_seq(struct tipc_msg *m)
290 return msg_bits(m, 0, 20, 1);
293 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
295 msg_set_bits(m, 0, 20, 1, n);
298 static inline int msg_is_syn(struct tipc_msg *m)
300 return msg_bits(m, 0, 17, 1);
303 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
305 msg_set_bits(m, 0, 17, 1, d);
308 static inline int msg_dest_droppable(struct tipc_msg *m)
310 return msg_bits(m, 0, 19, 1);
313 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
315 msg_set_bits(m, 0, 19, 1, d);
318 static inline int msg_is_keepalive(struct tipc_msg *m)
320 return msg_bits(m, 0, 19, 1);
323 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
325 msg_set_bits(m, 0, 19, 1, d);
328 static inline int msg_src_droppable(struct tipc_msg *m)
330 return msg_bits(m, 0, 18, 1);
333 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
335 msg_set_bits(m, 0, 18, 1, d);
338 static inline int msg_ack_required(struct tipc_msg *m)
340 return msg_bits(m, 0, 18, 1);
343 static inline void msg_set_ack_required(struct tipc_msg *m)
345 msg_set_bits(m, 0, 18, 1, 1);
348 static inline int msg_nagle_ack(struct tipc_msg *m)
350 return msg_bits(m, 0, 18, 1);
353 static inline void msg_set_nagle_ack(struct tipc_msg *m)
355 msg_set_bits(m, 0, 18, 1, 1);
358 static inline bool msg_is_rcast(struct tipc_msg *m)
360 return msg_bits(m, 0, 18, 0x1);
363 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
365 msg_set_bits(m, 0, 18, 0x1, d);
368 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
370 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
373 static inline unchar *msg_data(struct tipc_msg *m)
375 return ((unchar *)m) + msg_hdr_sz(m);
378 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
380 return (struct tipc_msg *)msg_data(m);
386 static inline u32 msg_type(struct tipc_msg *m)
388 return msg_bits(m, 1, 29, 0x7);
391 static inline void msg_set_type(struct tipc_msg *m, u32 n)
393 msg_set_bits(m, 1, 29, 0x7, n);
396 static inline int msg_in_group(struct tipc_msg *m)
398 int mtyp = msg_type(m);
400 return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
403 static inline bool msg_is_grp_evt(struct tipc_msg *m)
405 return msg_type(m) == TIPC_GRP_MEMBER_EVT;
408 static inline u32 msg_named(struct tipc_msg *m)
410 return msg_type(m) == TIPC_NAMED_MSG;
413 static inline u32 msg_mcast(struct tipc_msg *m)
415 int mtyp = msg_type(m);
417 return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
418 (mtyp == TIPC_GRP_MCAST_MSG));
421 static inline u32 msg_connected(struct tipc_msg *m)
423 return msg_type(m) == TIPC_CONN_MSG;
426 static inline u32 msg_direct(struct tipc_msg *m)
428 return msg_type(m) == TIPC_DIRECT_MSG;
431 static inline u32 msg_errcode(struct tipc_msg *m)
433 return msg_bits(m, 1, 25, 0xf);
436 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
438 msg_set_bits(m, 1, 25, 0xf, err);
441 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
443 return msg_bits(m, 1, 21, 0xf);
446 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
448 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
451 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
453 msg_set_bits(m, 1, 21, 0xf, 0);
456 static inline u32 msg_lookup_scope(struct tipc_msg *m)
458 return msg_bits(m, 1, 19, 0x3);
461 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
463 msg_set_bits(m, 1, 19, 0x3, n);
466 static inline u16 msg_bcast_ack(struct tipc_msg *m)
468 return msg_bits(m, 1, 0, 0xffff);
471 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
473 msg_set_bits(m, 1, 0, 0xffff, n);
476 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
477 * link peer session number
479 static inline bool msg_dest_session_valid(struct tipc_msg *m)
481 return msg_bits(m, 1, 16, 0x1);
484 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
486 msg_set_bits(m, 1, 16, 0x1, valid);
489 static inline u16 msg_dest_session(struct tipc_msg *m)
491 return msg_bits(m, 1, 0, 0xffff);
494 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
496 msg_set_bits(m, 1, 0, 0xffff, n);
502 static inline u16 msg_ack(struct tipc_msg *m)
504 return msg_bits(m, 2, 16, 0xffff);
507 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
509 msg_set_bits(m, 2, 16, 0xffff, n);
512 static inline u16 msg_seqno(struct tipc_msg *m)
514 return msg_bits(m, 2, 0, 0xffff);
517 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
519 msg_set_bits(m, 2, 0, 0xffff, n);
525 static inline u32 msg_importance(struct tipc_msg *m)
527 int usr = msg_user(m);
529 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
531 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
532 return msg_bits(m, 9, 0, 0x7);
533 return TIPC_SYSTEM_IMPORTANCE;
536 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
538 int usr = msg_user(m);
540 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
541 msg_set_bits(m, 9, 0, 0x7, i);
542 else if (i < TIPC_SYSTEM_IMPORTANCE)
545 pr_warn("Trying to set illegal importance in message\n");
548 static inline u32 msg_prevnode(struct tipc_msg *m)
550 return msg_word(m, 3);
553 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
555 msg_set_word(m, 3, a);
558 static inline u32 msg_origport(struct tipc_msg *m)
560 if (msg_user(m) == MSG_FRAGMENTER)
561 m = msg_inner_hdr(m);
562 return msg_word(m, 4);
565 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
567 msg_set_word(m, 4, p);
570 static inline u32 msg_destport(struct tipc_msg *m)
572 return msg_word(m, 5);
575 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
577 msg_set_word(m, 5, p);
580 static inline u32 msg_mc_netid(struct tipc_msg *m)
582 return msg_word(m, 5);
585 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
587 msg_set_word(m, 5, p);
590 static inline int msg_short(struct tipc_msg *m)
592 return msg_hdr_sz(m) == SHORT_H_SIZE;
595 static inline u32 msg_orignode(struct tipc_msg *m)
597 if (likely(msg_short(m)))
598 return msg_prevnode(m);
599 return msg_word(m, 6);
602 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
604 msg_set_word(m, 6, a);
607 static inline u32 msg_destnode(struct tipc_msg *m)
609 return msg_word(m, 7);
612 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
614 msg_set_word(m, 7, a);
617 static inline u32 msg_nametype(struct tipc_msg *m)
619 return msg_word(m, 8);
622 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
624 msg_set_word(m, 8, n);
627 static inline u32 msg_nameinst(struct tipc_msg *m)
629 return msg_word(m, 9);
632 static inline u32 msg_namelower(struct tipc_msg *m)
634 return msg_nameinst(m);
637 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
639 msg_set_word(m, 9, n);
642 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
644 msg_set_namelower(m, n);
647 static inline u32 msg_nameupper(struct tipc_msg *m)
649 return msg_word(m, 10);
652 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
654 msg_set_word(m, 10, n);
658 * Constants and routines used to read and write TIPC internal message headers
662 * Connection management protocol message types
665 #define CONN_PROBE_REPLY 1
669 * Name distributor message types
671 #define PUBLICATION 0
675 * Segmentation message types
677 #define FIRST_FRAGMENT 0
679 #define LAST_FRAGMENT 2
682 * Link management protocol message types
686 #define ACTIVATE_MSG 2
689 * Changeover tunnel message types
692 #define FAILOVER_MSG 1
695 * Config protocol message types
697 #define DSC_REQ_MSG 0
698 #define DSC_RESP_MSG 1
699 #define DSC_TRIAL_MSG 2
700 #define DSC_TRIAL_FAIL_MSG 3
703 * Group protocol message types
705 #define GRP_JOIN_MSG 0
706 #define GRP_LEAVE_MSG 1
707 #define GRP_ADV_MSG 2
708 #define GRP_ACK_MSG 3
709 #define GRP_RECLAIM_MSG 4
710 #define GRP_REMIT_MSG 5
715 static inline u32 msg_seq_gap(struct tipc_msg *m)
717 return msg_bits(m, 1, 16, 0x1fff);
720 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
722 msg_set_bits(m, 1, 16, 0x1fff, n);
725 static inline u32 msg_node_sig(struct tipc_msg *m)
727 return msg_bits(m, 1, 0, 0xffff);
730 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
732 msg_set_bits(m, 1, 0, 0xffff, n);
735 static inline u32 msg_node_capabilities(struct tipc_msg *m)
737 return msg_bits(m, 1, 15, 0x1fff);
740 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
742 msg_set_bits(m, 1, 15, 0x1fff, n);
748 static inline u32 msg_dest_domain(struct tipc_msg *m)
750 return msg_word(m, 2);
753 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
755 msg_set_word(m, 2, n);
758 static inline u32 msg_bcgap_after(struct tipc_msg *m)
760 return msg_bits(m, 2, 16, 0xffff);
763 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
765 msg_set_bits(m, 2, 16, 0xffff, n);
768 static inline u32 msg_bcgap_to(struct tipc_msg *m)
770 return msg_bits(m, 2, 0, 0xffff);
773 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
775 msg_set_bits(m, 2, 0, 0xffff, n);
781 static inline u32 msg_last_bcast(struct tipc_msg *m)
783 return msg_bits(m, 4, 16, 0xffff);
786 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
788 return msg_last_bcast(m) + 1;
791 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
793 msg_set_bits(m, 4, 16, 0xffff, n);
796 static inline u32 msg_nof_fragms(struct tipc_msg *m)
798 return msg_bits(m, 4, 0, 0xffff);
801 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
803 msg_set_bits(m, 4, 0, 0xffff, n);
806 static inline u32 msg_fragm_no(struct tipc_msg *m)
808 return msg_bits(m, 4, 16, 0xffff);
811 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
813 msg_set_bits(m, 4, 16, 0xffff, n);
816 static inline u16 msg_next_sent(struct tipc_msg *m)
818 return msg_bits(m, 4, 0, 0xffff);
821 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
823 msg_set_bits(m, 4, 0, 0xffff, n);
826 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
828 msg_set_bits(m, 4, 0, 0xffff, n);
831 static inline u32 msg_bc_netid(struct tipc_msg *m)
833 return msg_word(m, 4);
836 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
838 msg_set_word(m, 4, id);
841 static inline u32 msg_link_selector(struct tipc_msg *m)
843 if (msg_user(m) == MSG_FRAGMENTER)
844 m = (void *)msg_data(m);
845 return msg_bits(m, 4, 0, 1);
851 static inline u16 msg_session(struct tipc_msg *m)
853 return msg_bits(m, 5, 16, 0xffff);
856 static inline void msg_set_session(struct tipc_msg *m, u16 n)
858 msg_set_bits(m, 5, 16, 0xffff, n);
861 static inline u32 msg_probe(struct tipc_msg *m)
863 return msg_bits(m, 5, 0, 1);
866 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
868 msg_set_bits(m, 5, 0, 1, val);
871 static inline char msg_net_plane(struct tipc_msg *m)
873 return msg_bits(m, 5, 1, 7) + 'A';
876 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
878 msg_set_bits(m, 5, 1, 7, (n - 'A'));
881 static inline u32 msg_linkprio(struct tipc_msg *m)
883 return msg_bits(m, 5, 4, 0x1f);
886 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
888 msg_set_bits(m, 5, 4, 0x1f, n);
891 static inline u32 msg_bearer_id(struct tipc_msg *m)
893 return msg_bits(m, 5, 9, 0x7);
896 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
898 msg_set_bits(m, 5, 9, 0x7, n);
901 static inline u32 msg_redundant_link(struct tipc_msg *m)
903 return msg_bits(m, 5, 12, 0x1);
906 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
908 msg_set_bits(m, 5, 12, 0x1, r);
911 static inline u32 msg_peer_stopping(struct tipc_msg *m)
913 return msg_bits(m, 5, 13, 0x1);
916 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
918 msg_set_bits(m, 5, 13, 0x1, s);
921 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
923 switch (msg_user(m)) {
925 case NAME_DISTRIBUTOR:
927 return msg_bits(m, 5, 14, 0x1);
933 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
935 msg_set_bits(m, 5, 14, 0x1, invalid);
938 static inline char *msg_media_addr(struct tipc_msg *m)
940 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
943 static inline u32 msg_bc_gap(struct tipc_msg *m)
945 return msg_bits(m, 8, 0, 0x3ff);
948 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
950 msg_set_bits(m, 8, 0, 0x3ff, n);
956 static inline u16 msg_msgcnt(struct tipc_msg *m)
958 return msg_bits(m, 9, 16, 0xffff);
961 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
963 msg_set_bits(m, 9, 16, 0xffff, n);
966 static inline u16 msg_syncpt(struct tipc_msg *m)
968 return msg_bits(m, 9, 16, 0xffff);
971 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
973 msg_set_bits(m, 9, 16, 0xffff, n);
976 static inline u32 msg_conn_ack(struct tipc_msg *m)
978 return msg_bits(m, 9, 16, 0xffff);
981 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
983 msg_set_bits(m, 9, 16, 0xffff, n);
986 static inline u16 msg_adv_win(struct tipc_msg *m)
988 return msg_bits(m, 9, 0, 0xffff);
991 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
993 msg_set_bits(m, 9, 0, 0xffff, n);
996 static inline u32 msg_max_pkt(struct tipc_msg *m)
998 return msg_bits(m, 9, 16, 0xffff) * 4;
1001 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
1003 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
1006 static inline u32 msg_link_tolerance(struct tipc_msg *m)
1008 return msg_bits(m, 9, 0, 0xffff);
1011 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
1013 msg_set_bits(m, 9, 0, 0xffff, n);
1016 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
1018 return msg_bits(m, 9, 16, 0xffff);
1021 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
1023 msg_set_bits(m, 9, 16, 0xffff, n);
1026 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
1028 return msg_bits(m, 9, 16, 0xffff);
1031 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
1033 msg_set_bits(m, 9, 16, 0xffff, n);
1036 static inline u16 msg_grp_remitted(struct tipc_msg *m)
1038 return msg_bits(m, 9, 16, 0xffff);
1041 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
1043 msg_set_bits(m, 9, 16, 0xffff, n);
1048 static inline u16 msg_grp_evt(struct tipc_msg *m)
1050 return msg_bits(m, 10, 0, 0x3);
1053 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
1055 msg_set_bits(m, 10, 0, 0x3, n);
1058 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
1060 return msg_bits(m, 10, 0, 0x1);
1063 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
1065 msg_set_bits(m, 10, 0, 0x1, n);
1068 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
1070 return msg_bits(m, 10, 16, 0xffff);
1073 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
1075 msg_set_bits(m, 10, 16, 0xffff, n);
1078 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
1080 if (likely(msg_user(m) != LINK_PROTOCOL))
1082 if (msg_type(m) == STATE_MSG)
1087 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
1089 if (msg_peer_link_is_up(m))
1091 return msg_redundant_link(m);
1094 static inline bool msg_is_reset(struct tipc_msg *hdr)
1096 return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
1101 static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n)
1103 msg_set_word(m, 13, n);
1106 static inline u32 msg_peer_net_hash(struct tipc_msg *m)
1108 return msg_word(m, 13);
1113 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
1115 return msg_word(m, 14);
1118 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
1120 msg_set_word(m, 14, n);
1123 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
1125 memcpy(msg_data(hdr), id, 16);
1128 static inline u8 *msg_node_id(struct tipc_msg *hdr)
1130 return (u8 *)msg_data(hdr);
1133 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
1134 bool tipc_msg_validate(struct sk_buff **_skb);
1135 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
1136 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
1137 struct sk_buff_head *xmitq);
1138 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
1139 u32 hsize, u32 destnode);
1140 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
1141 uint data_sz, u32 dnode, u32 onode,
1142 u32 dport, u32 oport, int errcode);
1143 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
1144 bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss,
1145 u32 dnode, bool *new_bundle);
1146 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
1147 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
1148 int pktmax, struct sk_buff_head *frags);
1149 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
1150 int offset, int dsz, int mtu, struct sk_buff_head *list);
1151 int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen,
1152 int mss, struct sk_buff_head *txq);
1153 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1154 bool tipc_msg_assemble(struct sk_buff_head *list);
1155 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1156 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1157 struct sk_buff_head *cpy);
1158 bool __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1159 struct sk_buff *skb);
1160 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1162 static inline u16 buf_seqno(struct sk_buff *skb)
1164 return msg_seqno(buf_msg(skb));
1167 static inline int buf_roundup_len(struct sk_buff *skb)
1169 return (skb->len / 1024 + 1) * 1024;
1172 /* tipc_skb_peek(): peek and reserve first buffer in list
1173 * @list: list to be peeked in
1174 * Returns pointer to first buffer in list, if any
1176 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1179 struct sk_buff *skb;
1182 skb = skb_peek(list);
1185 spin_unlock_bh(lock);
1189 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1190 * up to and including 'filter'.
1191 * Note: ignoring previously tried destinations minimizes the risk of
1192 * contention on the socket lock
1193 * @list: list to be peeked in
1194 * @filter: last destination to be ignored from search
1195 * Returns a destination port number, of applicable.
1197 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1199 struct sk_buff *skb;
1203 spin_lock_bh(&list->lock);
1204 skb_queue_walk(list, skb) {
1205 dport = msg_destport(buf_msg(skb));
1206 if (!filter || skb_queue_is_last(list, skb))
1208 if (dport == filter)
1213 spin_unlock_bh(&list->lock);
1217 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1218 * @list: list to be unlinked from
1219 * @dport: selection criteria for buffer to unlink
1221 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1224 struct sk_buff *_skb, *tmp, *skb = NULL;
1226 spin_lock_bh(&list->lock);
1227 skb_queue_walk_safe(list, _skb, tmp) {
1228 if (msg_destport(buf_msg(_skb)) == dport) {
1229 __skb_unlink(_skb, list);
1234 spin_unlock_bh(&list->lock);
1238 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1239 * @list: the new list to append. Not lock protected
1240 * @head: target list. Lock protected.
1242 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1243 struct sk_buff_head *head)
1245 spin_lock_bh(&head->lock);
1246 skb_queue_splice_tail(list, head);
1247 spin_unlock_bh(&head->lock);
1250 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1251 * @list: the new list to add. Lock protected. Will be reinitialized
1252 * @head: target list. Lock protected.
1254 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1255 struct sk_buff_head *head)
1257 struct sk_buff_head tmp;
1259 __skb_queue_head_init(&tmp);
1261 spin_lock_bh(&list->lock);
1262 skb_queue_splice_tail_init(list, &tmp);
1263 spin_unlock_bh(&list->lock);
1264 tipc_skb_queue_splice_tail(&tmp, head);
1267 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
1268 * @list: list to be dequeued from
1269 * @seqno: seqno of the expected msg
1271 * returns skb dequeued from the list if its seqno is less than or equal to
1272 * the expected one, otherwise the skb is still hold
1274 * Note: must be used with appropriate locks held only
1276 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
1279 struct sk_buff *skb = skb_peek(list);
1281 if (skb && less_eq(buf_seqno(skb), seqno)) {
1282 __skb_unlink(skb, list);