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
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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
105 struct sk_buff *tail;
106 unsigned long nxt_retr;
107 unsigned long retr_stamp;
116 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
122 /* struct tipc_gap_ack - TIPC Gap ACK block
123 * @ack: seqno of the last consecutive packet in link deferdq
124 * @gap: number of gap packets since the last ack
127 * link deferdq: 1 2 3 4 10 11 13 14 15 20
128 * --> Gap ACK blocks: <4, 5>, <11, 1>, <15, 4>, <20, 0>
130 struct tipc_gap_ack {
135 /* struct tipc_gap_ack_blks
136 * @len: actual length of the record
137 * @gack_cnt: number of Gap ACK blocks in the record
138 * @gacks: array of Gap ACK blocks
140 struct tipc_gap_ack_blks {
144 struct tipc_gap_ack gacks[];
147 #define tipc_gap_ack_blks_sz(n) (sizeof(struct tipc_gap_ack_blks) + \
148 sizeof(struct tipc_gap_ack) * (n))
150 #define MAX_GAP_ACK_BLKS 32
151 #define MAX_GAP_ACK_BLKS_SZ tipc_gap_ack_blks_sz(MAX_GAP_ACK_BLKS)
153 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
155 return (struct tipc_msg *)skb->data;
158 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
160 return ntohl(m->hdr[pos]);
163 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
165 m->hdr[w] = htonl(val);
168 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
170 return (msg_word(m, w) >> pos) & mask;
173 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
174 u32 pos, u32 mask, u32 val)
176 val = (val & mask) << pos;
178 m->hdr[w] &= ~htonl(mask);
179 m->hdr[w] |= htonl(val);
182 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
184 u32 temp = msg->hdr[a];
186 msg->hdr[a] = msg->hdr[b];
193 static inline u32 msg_version(struct tipc_msg *m)
195 return msg_bits(m, 0, 29, 7);
198 static inline void msg_set_version(struct tipc_msg *m)
200 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
203 static inline u32 msg_user(struct tipc_msg *m)
205 return msg_bits(m, 0, 25, 0xf);
208 static inline u32 msg_isdata(struct tipc_msg *m)
210 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
213 static inline void msg_set_user(struct tipc_msg *m, u32 n)
215 msg_set_bits(m, 0, 25, 0xf, n);
218 static inline u32 msg_hdr_sz(struct tipc_msg *m)
220 return msg_bits(m, 0, 21, 0xf) << 2;
223 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
225 msg_set_bits(m, 0, 21, 0xf, n>>2);
228 static inline u32 msg_size(struct tipc_msg *m)
230 return msg_bits(m, 0, 0, 0x1ffff);
233 static inline u32 msg_blocks(struct tipc_msg *m)
235 return (msg_size(m) / 1024) + 1;
238 static inline u32 msg_data_sz(struct tipc_msg *m)
240 return msg_size(m) - msg_hdr_sz(m);
243 static inline int msg_non_seq(struct tipc_msg *m)
245 return msg_bits(m, 0, 20, 1);
248 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
250 msg_set_bits(m, 0, 20, 1, n);
253 static inline int msg_is_syn(struct tipc_msg *m)
255 return msg_bits(m, 0, 17, 1);
258 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
260 msg_set_bits(m, 0, 17, 1, d);
263 static inline int msg_dest_droppable(struct tipc_msg *m)
265 return msg_bits(m, 0, 19, 1);
268 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
270 msg_set_bits(m, 0, 19, 1, d);
273 static inline int msg_is_keepalive(struct tipc_msg *m)
275 return msg_bits(m, 0, 19, 1);
278 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
280 msg_set_bits(m, 0, 19, 1, d);
283 static inline int msg_src_droppable(struct tipc_msg *m)
285 return msg_bits(m, 0, 18, 1);
288 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
290 msg_set_bits(m, 0, 18, 1, d);
293 static inline bool msg_is_rcast(struct tipc_msg *m)
295 return msg_bits(m, 0, 18, 0x1);
298 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
300 msg_set_bits(m, 0, 18, 0x1, d);
303 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
305 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
308 static inline unchar *msg_data(struct tipc_msg *m)
310 return ((unchar *)m) + msg_hdr_sz(m);
313 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
315 return (struct tipc_msg *)msg_data(m);
321 static inline u32 msg_type(struct tipc_msg *m)
323 return msg_bits(m, 1, 29, 0x7);
326 static inline void msg_set_type(struct tipc_msg *m, u32 n)
328 msg_set_bits(m, 1, 29, 0x7, n);
331 static inline int msg_in_group(struct tipc_msg *m)
333 int mtyp = msg_type(m);
335 return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
338 static inline bool msg_is_grp_evt(struct tipc_msg *m)
340 return msg_type(m) == TIPC_GRP_MEMBER_EVT;
343 static inline u32 msg_named(struct tipc_msg *m)
345 return msg_type(m) == TIPC_NAMED_MSG;
348 static inline u32 msg_mcast(struct tipc_msg *m)
350 int mtyp = msg_type(m);
352 return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
353 (mtyp == TIPC_GRP_MCAST_MSG));
356 static inline u32 msg_connected(struct tipc_msg *m)
358 return msg_type(m) == TIPC_CONN_MSG;
361 static inline u32 msg_errcode(struct tipc_msg *m)
363 return msg_bits(m, 1, 25, 0xf);
366 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
368 msg_set_bits(m, 1, 25, 0xf, err);
371 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
373 return msg_bits(m, 1, 21, 0xf);
376 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
378 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
381 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
383 msg_set_bits(m, 1, 21, 0xf, 0);
386 static inline u32 msg_lookup_scope(struct tipc_msg *m)
388 return msg_bits(m, 1, 19, 0x3);
391 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
393 msg_set_bits(m, 1, 19, 0x3, n);
396 static inline u16 msg_bcast_ack(struct tipc_msg *m)
398 return msg_bits(m, 1, 0, 0xffff);
401 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
403 msg_set_bits(m, 1, 0, 0xffff, n);
406 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
407 * link peer session number
409 static inline bool msg_dest_session_valid(struct tipc_msg *m)
411 return msg_bits(m, 1, 16, 0x1);
414 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
416 msg_set_bits(m, 1, 16, 0x1, valid);
419 static inline u16 msg_dest_session(struct tipc_msg *m)
421 return msg_bits(m, 1, 0, 0xffff);
424 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
426 msg_set_bits(m, 1, 0, 0xffff, n);
432 static inline u16 msg_ack(struct tipc_msg *m)
434 return msg_bits(m, 2, 16, 0xffff);
437 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
439 msg_set_bits(m, 2, 16, 0xffff, n);
442 static inline u16 msg_seqno(struct tipc_msg *m)
444 return msg_bits(m, 2, 0, 0xffff);
447 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
449 msg_set_bits(m, 2, 0, 0xffff, n);
455 static inline u32 msg_importance(struct tipc_msg *m)
457 int usr = msg_user(m);
459 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
461 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
462 return msg_bits(m, 9, 0, 0x7);
463 return TIPC_SYSTEM_IMPORTANCE;
466 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
468 int usr = msg_user(m);
470 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
471 msg_set_bits(m, 9, 0, 0x7, i);
472 else if (i < TIPC_SYSTEM_IMPORTANCE)
475 pr_warn("Trying to set illegal importance in message\n");
478 static inline u32 msg_prevnode(struct tipc_msg *m)
480 return msg_word(m, 3);
483 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
485 msg_set_word(m, 3, a);
488 static inline u32 msg_origport(struct tipc_msg *m)
490 if (msg_user(m) == MSG_FRAGMENTER)
491 m = msg_inner_hdr(m);
492 return msg_word(m, 4);
495 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
497 msg_set_word(m, 4, p);
500 static inline u32 msg_destport(struct tipc_msg *m)
502 return msg_word(m, 5);
505 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
507 msg_set_word(m, 5, p);
510 static inline u32 msg_mc_netid(struct tipc_msg *m)
512 return msg_word(m, 5);
515 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
517 msg_set_word(m, 5, p);
520 static inline int msg_short(struct tipc_msg *m)
522 return msg_hdr_sz(m) == SHORT_H_SIZE;
525 static inline u32 msg_orignode(struct tipc_msg *m)
527 if (likely(msg_short(m)))
528 return msg_prevnode(m);
529 return msg_word(m, 6);
532 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
534 msg_set_word(m, 6, a);
537 static inline u32 msg_destnode(struct tipc_msg *m)
539 return msg_word(m, 7);
542 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
544 msg_set_word(m, 7, a);
547 static inline u32 msg_nametype(struct tipc_msg *m)
549 return msg_word(m, 8);
552 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
554 msg_set_word(m, 8, n);
557 static inline u32 msg_nameinst(struct tipc_msg *m)
559 return msg_word(m, 9);
562 static inline u32 msg_namelower(struct tipc_msg *m)
564 return msg_nameinst(m);
567 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
569 msg_set_word(m, 9, n);
572 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
574 msg_set_namelower(m, n);
577 static inline u32 msg_nameupper(struct tipc_msg *m)
579 return msg_word(m, 10);
582 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
584 msg_set_word(m, 10, n);
588 * Constants and routines used to read and write TIPC internal message headers
592 * Connection management protocol message types
595 #define CONN_PROBE_REPLY 1
599 * Name distributor message types
601 #define PUBLICATION 0
605 * Segmentation message types
607 #define FIRST_FRAGMENT 0
609 #define LAST_FRAGMENT 2
612 * Link management protocol message types
616 #define ACTIVATE_MSG 2
619 * Changeover tunnel message types
622 #define FAILOVER_MSG 1
625 * Config protocol message types
627 #define DSC_REQ_MSG 0
628 #define DSC_RESP_MSG 1
629 #define DSC_TRIAL_MSG 2
630 #define DSC_TRIAL_FAIL_MSG 3
633 * Group protocol message types
635 #define GRP_JOIN_MSG 0
636 #define GRP_LEAVE_MSG 1
637 #define GRP_ADV_MSG 2
638 #define GRP_ACK_MSG 3
639 #define GRP_RECLAIM_MSG 4
640 #define GRP_REMIT_MSG 5
645 static inline u32 msg_seq_gap(struct tipc_msg *m)
647 return msg_bits(m, 1, 16, 0x1fff);
650 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
652 msg_set_bits(m, 1, 16, 0x1fff, n);
655 static inline u32 msg_node_sig(struct tipc_msg *m)
657 return msg_bits(m, 1, 0, 0xffff);
660 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
662 msg_set_bits(m, 1, 0, 0xffff, n);
665 static inline u32 msg_node_capabilities(struct tipc_msg *m)
667 return msg_bits(m, 1, 15, 0x1fff);
670 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
672 msg_set_bits(m, 1, 15, 0x1fff, n);
678 static inline u32 msg_dest_domain(struct tipc_msg *m)
680 return msg_word(m, 2);
683 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
685 msg_set_word(m, 2, n);
688 static inline u32 msg_bcgap_after(struct tipc_msg *m)
690 return msg_bits(m, 2, 16, 0xffff);
693 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
695 msg_set_bits(m, 2, 16, 0xffff, n);
698 static inline u32 msg_bcgap_to(struct tipc_msg *m)
700 return msg_bits(m, 2, 0, 0xffff);
703 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
705 msg_set_bits(m, 2, 0, 0xffff, n);
711 static inline u32 msg_last_bcast(struct tipc_msg *m)
713 return msg_bits(m, 4, 16, 0xffff);
716 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
718 return msg_last_bcast(m) + 1;
721 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
723 msg_set_bits(m, 4, 16, 0xffff, n);
726 static inline u32 msg_nof_fragms(struct tipc_msg *m)
728 return msg_bits(m, 4, 0, 0xffff);
731 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
733 msg_set_bits(m, 4, 0, 0xffff, n);
736 static inline u32 msg_fragm_no(struct tipc_msg *m)
738 return msg_bits(m, 4, 16, 0xffff);
741 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
743 msg_set_bits(m, 4, 16, 0xffff, n);
746 static inline u16 msg_next_sent(struct tipc_msg *m)
748 return msg_bits(m, 4, 0, 0xffff);
751 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
753 msg_set_bits(m, 4, 0, 0xffff, n);
756 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
758 msg_set_bits(m, 4, 0, 0xffff, n);
761 static inline u32 msg_bc_netid(struct tipc_msg *m)
763 return msg_word(m, 4);
766 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
768 msg_set_word(m, 4, id);
771 static inline u32 msg_link_selector(struct tipc_msg *m)
773 if (msg_user(m) == MSG_FRAGMENTER)
774 m = (void *)msg_data(m);
775 return msg_bits(m, 4, 0, 1);
781 static inline u16 msg_session(struct tipc_msg *m)
783 return msg_bits(m, 5, 16, 0xffff);
786 static inline void msg_set_session(struct tipc_msg *m, u16 n)
788 msg_set_bits(m, 5, 16, 0xffff, n);
791 static inline u32 msg_probe(struct tipc_msg *m)
793 return msg_bits(m, 5, 0, 1);
796 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
798 msg_set_bits(m, 5, 0, 1, val);
801 static inline char msg_net_plane(struct tipc_msg *m)
803 return msg_bits(m, 5, 1, 7) + 'A';
806 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
808 msg_set_bits(m, 5, 1, 7, (n - 'A'));
811 static inline u32 msg_linkprio(struct tipc_msg *m)
813 return msg_bits(m, 5, 4, 0x1f);
816 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
818 msg_set_bits(m, 5, 4, 0x1f, n);
821 static inline u32 msg_bearer_id(struct tipc_msg *m)
823 return msg_bits(m, 5, 9, 0x7);
826 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
828 msg_set_bits(m, 5, 9, 0x7, n);
831 static inline u32 msg_redundant_link(struct tipc_msg *m)
833 return msg_bits(m, 5, 12, 0x1);
836 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
838 msg_set_bits(m, 5, 12, 0x1, r);
841 static inline u32 msg_peer_stopping(struct tipc_msg *m)
843 return msg_bits(m, 5, 13, 0x1);
846 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
848 msg_set_bits(m, 5, 13, 0x1, s);
851 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
853 switch (msg_user(m)) {
855 case NAME_DISTRIBUTOR:
857 return msg_bits(m, 5, 14, 0x1);
863 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
865 msg_set_bits(m, 5, 14, 0x1, invalid);
868 static inline char *msg_media_addr(struct tipc_msg *m)
870 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
873 static inline u32 msg_bc_gap(struct tipc_msg *m)
875 return msg_bits(m, 8, 0, 0x3ff);
878 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
880 msg_set_bits(m, 8, 0, 0x3ff, n);
886 static inline u16 msg_msgcnt(struct tipc_msg *m)
888 return msg_bits(m, 9, 16, 0xffff);
891 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
893 msg_set_bits(m, 9, 16, 0xffff, n);
896 static inline u16 msg_syncpt(struct tipc_msg *m)
898 return msg_bits(m, 9, 16, 0xffff);
901 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
903 msg_set_bits(m, 9, 16, 0xffff, n);
906 static inline u32 msg_conn_ack(struct tipc_msg *m)
908 return msg_bits(m, 9, 16, 0xffff);
911 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
913 msg_set_bits(m, 9, 16, 0xffff, n);
916 static inline u16 msg_adv_win(struct tipc_msg *m)
918 return msg_bits(m, 9, 0, 0xffff);
921 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
923 msg_set_bits(m, 9, 0, 0xffff, n);
926 static inline u32 msg_max_pkt(struct tipc_msg *m)
928 return msg_bits(m, 9, 16, 0xffff) * 4;
931 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
933 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
936 static inline u32 msg_link_tolerance(struct tipc_msg *m)
938 return msg_bits(m, 9, 0, 0xffff);
941 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
943 msg_set_bits(m, 9, 0, 0xffff, n);
946 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
948 return msg_bits(m, 9, 16, 0xffff);
951 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
953 msg_set_bits(m, 9, 16, 0xffff, n);
956 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
958 return msg_bits(m, 9, 16, 0xffff);
961 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
963 msg_set_bits(m, 9, 16, 0xffff, n);
966 static inline u16 msg_grp_remitted(struct tipc_msg *m)
968 return msg_bits(m, 9, 16, 0xffff);
971 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
973 msg_set_bits(m, 9, 16, 0xffff, n);
978 static inline u16 msg_grp_evt(struct tipc_msg *m)
980 return msg_bits(m, 10, 0, 0x3);
983 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
985 msg_set_bits(m, 10, 0, 0x3, n);
988 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
990 return msg_bits(m, 10, 0, 0x1);
993 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
995 msg_set_bits(m, 10, 0, 0x1, n);
998 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
1000 return msg_bits(m, 10, 16, 0xffff);
1003 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
1005 msg_set_bits(m, 10, 16, 0xffff, n);
1008 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
1010 if (likely(msg_user(m) != LINK_PROTOCOL))
1012 if (msg_type(m) == STATE_MSG)
1017 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
1019 if (msg_peer_link_is_up(m))
1021 return msg_redundant_link(m);
1024 static inline bool msg_is_reset(struct tipc_msg *hdr)
1026 return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
1029 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
1031 return msg_word(m, 14);
1034 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
1036 msg_set_word(m, 14, n);
1039 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
1041 memcpy(msg_data(hdr), id, 16);
1044 static inline u8 *msg_node_id(struct tipc_msg *hdr)
1046 return (u8 *)msg_data(hdr);
1049 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
1050 bool tipc_msg_validate(struct sk_buff **_skb);
1051 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
1052 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
1053 struct sk_buff_head *xmitq);
1054 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
1055 u32 hsize, u32 destnode);
1056 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
1057 uint data_sz, u32 dnode, u32 onode,
1058 u32 dport, u32 oport, int errcode);
1059 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
1060 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
1061 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
1062 u32 mtu, u32 dnode);
1063 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
1064 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
1065 int pktmax, struct sk_buff_head *frags);
1066 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
1067 int offset, int dsz, int mtu, struct sk_buff_head *list);
1068 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1069 bool tipc_msg_assemble(struct sk_buff_head *list);
1070 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1071 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1072 struct sk_buff_head *cpy);
1073 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1074 struct sk_buff *skb);
1075 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1077 static inline u16 buf_seqno(struct sk_buff *skb)
1079 return msg_seqno(buf_msg(skb));
1082 static inline int buf_roundup_len(struct sk_buff *skb)
1084 return (skb->len / 1024 + 1) * 1024;
1087 /* tipc_skb_peek(): peek and reserve first buffer in list
1088 * @list: list to be peeked in
1089 * Returns pointer to first buffer in list, if any
1091 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1094 struct sk_buff *skb;
1097 skb = skb_peek(list);
1100 spin_unlock_bh(lock);
1104 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1105 * up to and including 'filter'.
1106 * Note: ignoring previously tried destinations minimizes the risk of
1107 * contention on the socket lock
1108 * @list: list to be peeked in
1109 * @filter: last destination to be ignored from search
1110 * Returns a destination port number, of applicable.
1112 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1114 struct sk_buff *skb;
1118 spin_lock_bh(&list->lock);
1119 skb_queue_walk(list, skb) {
1120 dport = msg_destport(buf_msg(skb));
1121 if (!filter || skb_queue_is_last(list, skb))
1123 if (dport == filter)
1128 spin_unlock_bh(&list->lock);
1132 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1133 * @list: list to be unlinked from
1134 * @dport: selection criteria for buffer to unlink
1136 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1139 struct sk_buff *_skb, *tmp, *skb = NULL;
1141 spin_lock_bh(&list->lock);
1142 skb_queue_walk_safe(list, _skb, tmp) {
1143 if (msg_destport(buf_msg(_skb)) == dport) {
1144 __skb_unlink(_skb, list);
1149 spin_unlock_bh(&list->lock);
1153 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1154 * @list: the new list to append. Not lock protected
1155 * @head: target list. Lock protected.
1157 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1158 struct sk_buff_head *head)
1160 spin_lock_bh(&head->lock);
1161 skb_queue_splice_tail(list, head);
1162 spin_unlock_bh(&head->lock);
1165 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1166 * @list: the new list to add. Lock protected. Will be reinitialized
1167 * @head: target list. Lock protected.
1169 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1170 struct sk_buff_head *head)
1172 struct sk_buff_head tmp;
1174 __skb_queue_head_init(&tmp);
1176 spin_lock_bh(&list->lock);
1177 skb_queue_splice_tail_init(list, &tmp);
1178 spin_unlock_bh(&list->lock);
1179 tipc_skb_queue_splice_tail(&tmp, head);
1182 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
1183 * @list: list to be dequeued from
1184 * @seqno: seqno of the expected msg
1186 * returns skb dequeued from the list if its seqno is less than or equal to
1187 * the expected one, otherwise the skb is still hold
1189 * Note: must be used with appropriate locks held only
1191 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
1194 struct sk_buff *skb = skb_peek(list);
1196 if (skb && less_eq(buf_seqno(skb), seqno)) {
1197 __skb_unlink(skb, list);