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
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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_UCAST_MSG 6
73 * Internal message users
75 #define BCAST_PROTOCOL 5
77 #define LINK_PROTOCOL 7
78 #define CONN_MANAGER 8
79 #define GROUP_PROTOCOL 9
80 #define TUNNEL_PROTOCOL 10
81 #define NAME_DISTRIBUTOR 11
82 #define MSG_FRAGMENTER 12
83 #define LINK_CONFIG 13
84 #define SOCK_WAKEUP 14 /* pseudo user */
85 #define TOP_SRV 15 /* pseudo user */
88 * Message header sizes
90 #define SHORT_H_SIZE 24 /* In-cluster basic payload message */
91 #define BASIC_H_SIZE 32 /* Basic payload message */
92 #define NAMED_H_SIZE 40 /* Named payload message */
93 #define MCAST_H_SIZE 44 /* Multicast payload message */
94 #define GROUP_H_SIZE 44 /* Group payload message */
95 #define INT_H_SIZE 40 /* Internal messages */
96 #define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
97 #define MAX_H_SIZE 60 /* Largest possible TIPC header size */
99 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
101 #define TIPC_MEDIA_INFO_OFFSET 5
106 struct sk_buff *tail;
112 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
118 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
120 return (struct tipc_msg *)skb->data;
123 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
125 return ntohl(m->hdr[pos]);
128 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
130 m->hdr[w] = htonl(val);
133 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
135 return (msg_word(m, w) >> pos) & mask;
138 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
139 u32 pos, u32 mask, u32 val)
141 val = (val & mask) << pos;
143 m->hdr[w] &= ~htonl(mask);
144 m->hdr[w] |= htonl(val);
147 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
149 u32 temp = msg->hdr[a];
151 msg->hdr[a] = msg->hdr[b];
158 static inline u32 msg_version(struct tipc_msg *m)
160 return msg_bits(m, 0, 29, 7);
163 static inline void msg_set_version(struct tipc_msg *m)
165 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
168 static inline u32 msg_user(struct tipc_msg *m)
170 return msg_bits(m, 0, 25, 0xf);
173 static inline u32 msg_isdata(struct tipc_msg *m)
175 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
178 static inline void msg_set_user(struct tipc_msg *m, u32 n)
180 msg_set_bits(m, 0, 25, 0xf, n);
183 static inline u32 msg_hdr_sz(struct tipc_msg *m)
185 return msg_bits(m, 0, 21, 0xf) << 2;
188 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
190 msg_set_bits(m, 0, 21, 0xf, n>>2);
193 static inline u32 msg_size(struct tipc_msg *m)
195 return msg_bits(m, 0, 0, 0x1ffff);
198 static inline u32 msg_data_sz(struct tipc_msg *m)
200 return msg_size(m) - msg_hdr_sz(m);
203 static inline int msg_non_seq(struct tipc_msg *m)
205 return msg_bits(m, 0, 20, 1);
208 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
210 msg_set_bits(m, 0, 20, 1, n);
213 static inline int msg_dest_droppable(struct tipc_msg *m)
215 return msg_bits(m, 0, 19, 1);
218 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
220 msg_set_bits(m, 0, 19, 1, d);
223 static inline int msg_src_droppable(struct tipc_msg *m)
225 return msg_bits(m, 0, 18, 1);
228 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
230 msg_set_bits(m, 0, 18, 1, d);
233 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
235 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
238 static inline unchar *msg_data(struct tipc_msg *m)
240 return ((unchar *)m) + msg_hdr_sz(m);
243 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
245 return (struct tipc_msg *)msg_data(m);
251 static inline u32 msg_type(struct tipc_msg *m)
253 return msg_bits(m, 1, 29, 0x7);
256 static inline void msg_set_type(struct tipc_msg *m, u32 n)
258 msg_set_bits(m, 1, 29, 0x7, n);
261 static inline int msg_in_group(struct tipc_msg *m)
263 int mtyp = msg_type(m);
265 return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
268 static inline bool msg_is_grp_evt(struct tipc_msg *m)
270 return msg_type(m) == TIPC_GRP_MEMBER_EVT;
273 static inline u32 msg_named(struct tipc_msg *m)
275 return msg_type(m) == TIPC_NAMED_MSG;
278 static inline u32 msg_mcast(struct tipc_msg *m)
280 int mtyp = msg_type(m);
282 return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG));
285 static inline u32 msg_connected(struct tipc_msg *m)
287 return msg_type(m) == TIPC_CONN_MSG;
290 static inline u32 msg_errcode(struct tipc_msg *m)
292 return msg_bits(m, 1, 25, 0xf);
295 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
297 msg_set_bits(m, 1, 25, 0xf, err);
300 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
302 return msg_bits(m, 1, 21, 0xf);
305 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
307 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
310 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
312 msg_set_bits(m, 1, 21, 0xf, 0);
315 static inline u32 msg_lookup_scope(struct tipc_msg *m)
317 return msg_bits(m, 1, 19, 0x3);
320 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
322 msg_set_bits(m, 1, 19, 0x3, n);
325 static inline u16 msg_bcast_ack(struct tipc_msg *m)
327 return msg_bits(m, 1, 0, 0xffff);
330 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
332 msg_set_bits(m, 1, 0, 0xffff, n);
339 static inline u16 msg_ack(struct tipc_msg *m)
341 return msg_bits(m, 2, 16, 0xffff);
344 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
346 msg_set_bits(m, 2, 16, 0xffff, n);
349 static inline u16 msg_seqno(struct tipc_msg *m)
351 return msg_bits(m, 2, 0, 0xffff);
354 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
356 msg_set_bits(m, 2, 0, 0xffff, n);
362 static inline u32 msg_importance(struct tipc_msg *m)
364 int usr = msg_user(m);
366 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
368 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
369 return msg_bits(m, 9, 0, 0x7);
370 return TIPC_SYSTEM_IMPORTANCE;
373 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
375 int usr = msg_user(m);
377 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
378 msg_set_bits(m, 9, 0, 0x7, i);
379 else if (i < TIPC_SYSTEM_IMPORTANCE)
382 pr_warn("Trying to set illegal importance in message\n");
385 static inline u32 msg_prevnode(struct tipc_msg *m)
387 return msg_word(m, 3);
390 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
392 msg_set_word(m, 3, a);
395 static inline u32 msg_origport(struct tipc_msg *m)
397 if (msg_user(m) == MSG_FRAGMENTER)
398 m = msg_get_wrapped(m);
399 return msg_word(m, 4);
402 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
404 msg_set_word(m, 4, p);
407 static inline u32 msg_destport(struct tipc_msg *m)
409 return msg_word(m, 5);
412 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
414 msg_set_word(m, 5, p);
417 static inline u32 msg_mc_netid(struct tipc_msg *m)
419 return msg_word(m, 5);
422 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
424 msg_set_word(m, 5, p);
427 static inline int msg_short(struct tipc_msg *m)
429 return msg_hdr_sz(m) == SHORT_H_SIZE;
432 static inline u32 msg_orignode(struct tipc_msg *m)
434 if (likely(msg_short(m)))
435 return msg_prevnode(m);
436 return msg_word(m, 6);
439 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
441 msg_set_word(m, 6, a);
444 static inline u32 msg_destnode(struct tipc_msg *m)
446 return msg_word(m, 7);
449 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
451 msg_set_word(m, 7, a);
454 static inline u32 msg_nametype(struct tipc_msg *m)
456 return msg_word(m, 8);
459 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
461 msg_set_word(m, 8, n);
464 static inline u32 msg_nameinst(struct tipc_msg *m)
466 return msg_word(m, 9);
469 static inline u32 msg_namelower(struct tipc_msg *m)
471 return msg_nameinst(m);
474 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
476 msg_set_word(m, 9, n);
479 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
481 msg_set_namelower(m, n);
484 static inline u32 msg_nameupper(struct tipc_msg *m)
486 return msg_word(m, 10);
489 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
491 msg_set_word(m, 10, n);
495 * Constants and routines used to read and write TIPC internal message headers
499 * Connection management protocol message types
502 #define CONN_PROBE_REPLY 1
506 * Name distributor message types
508 #define PUBLICATION 0
512 * Segmentation message types
514 #define FIRST_FRAGMENT 0
516 #define LAST_FRAGMENT 2
519 * Link management protocol message types
523 #define ACTIVATE_MSG 2
526 * Changeover tunnel message types
529 #define FAILOVER_MSG 1
532 * Config protocol message types
534 #define DSC_REQ_MSG 0
535 #define DSC_RESP_MSG 1
538 * Group protocol message types
540 #define GRP_JOIN_MSG 0
541 #define GRP_LEAVE_MSG 1
542 #define GRP_ADV_MSG 2
547 static inline u32 msg_seq_gap(struct tipc_msg *m)
549 return msg_bits(m, 1, 16, 0x1fff);
552 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
554 msg_set_bits(m, 1, 16, 0x1fff, n);
557 static inline u32 msg_node_sig(struct tipc_msg *m)
559 return msg_bits(m, 1, 0, 0xffff);
562 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
564 msg_set_bits(m, 1, 0, 0xffff, n);
567 static inline u32 msg_node_capabilities(struct tipc_msg *m)
569 return msg_bits(m, 1, 15, 0x1fff);
572 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
574 msg_set_bits(m, 1, 15, 0x1fff, n);
580 static inline u32 msg_dest_domain(struct tipc_msg *m)
582 return msg_word(m, 2);
585 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
587 msg_set_word(m, 2, n);
590 static inline u32 msg_bcgap_after(struct tipc_msg *m)
592 return msg_bits(m, 2, 16, 0xffff);
595 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
597 msg_set_bits(m, 2, 16, 0xffff, n);
600 static inline u32 msg_bcgap_to(struct tipc_msg *m)
602 return msg_bits(m, 2, 0, 0xffff);
605 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
607 msg_set_bits(m, 2, 0, 0xffff, n);
614 static inline u32 msg_last_bcast(struct tipc_msg *m)
616 return msg_bits(m, 4, 16, 0xffff);
619 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
621 return msg_last_bcast(m) + 1;
624 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
626 msg_set_bits(m, 4, 16, 0xffff, n);
629 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
631 msg_set_bits(m, 4, 16, 0xffff, n);
635 static inline u16 msg_next_sent(struct tipc_msg *m)
637 return msg_bits(m, 4, 0, 0xffff);
640 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
642 msg_set_bits(m, 4, 0, 0xffff, n);
645 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
647 msg_set_bits(m, 4, 0, 0xffff, n);
650 static inline u32 msg_bc_netid(struct tipc_msg *m)
652 return msg_word(m, 4);
655 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
657 msg_set_word(m, 4, id);
660 static inline u32 msg_link_selector(struct tipc_msg *m)
662 if (msg_user(m) == MSG_FRAGMENTER)
663 m = (void *)msg_data(m);
664 return msg_bits(m, 4, 0, 1);
670 static inline u16 msg_session(struct tipc_msg *m)
672 return msg_bits(m, 5, 16, 0xffff);
675 static inline void msg_set_session(struct tipc_msg *m, u16 n)
677 msg_set_bits(m, 5, 16, 0xffff, n);
680 static inline u32 msg_probe(struct tipc_msg *m)
682 return msg_bits(m, 5, 0, 1);
685 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
687 msg_set_bits(m, 5, 0, 1, val);
690 static inline char msg_net_plane(struct tipc_msg *m)
692 return msg_bits(m, 5, 1, 7) + 'A';
695 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
697 msg_set_bits(m, 5, 1, 7, (n - 'A'));
700 static inline u32 msg_linkprio(struct tipc_msg *m)
702 return msg_bits(m, 5, 4, 0x1f);
705 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
707 msg_set_bits(m, 5, 4, 0x1f, n);
710 static inline u32 msg_bearer_id(struct tipc_msg *m)
712 return msg_bits(m, 5, 9, 0x7);
715 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
717 msg_set_bits(m, 5, 9, 0x7, n);
720 static inline u32 msg_redundant_link(struct tipc_msg *m)
722 return msg_bits(m, 5, 12, 0x1);
725 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
727 msg_set_bits(m, 5, 12, 0x1, r);
730 static inline u32 msg_peer_stopping(struct tipc_msg *m)
732 return msg_bits(m, 5, 13, 0x1);
735 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
737 msg_set_bits(m, 5, 13, 0x1, s);
740 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
742 switch (msg_user(m)) {
744 case NAME_DISTRIBUTOR:
746 return msg_bits(m, 5, 14, 0x1);
752 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
754 msg_set_bits(m, 5, 14, 0x1, invalid);
757 static inline char *msg_media_addr(struct tipc_msg *m)
759 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
762 static inline u32 msg_bc_gap(struct tipc_msg *m)
764 return msg_bits(m, 8, 0, 0x3ff);
767 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
769 msg_set_bits(m, 8, 0, 0x3ff, n);
775 static inline u16 msg_msgcnt(struct tipc_msg *m)
777 return msg_bits(m, 9, 16, 0xffff);
780 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
782 msg_set_bits(m, 9, 16, 0xffff, n);
785 static inline u32 msg_conn_ack(struct tipc_msg *m)
787 return msg_bits(m, 9, 16, 0xffff);
790 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
792 msg_set_bits(m, 9, 16, 0xffff, n);
795 static inline u16 msg_adv_win(struct tipc_msg *m)
797 return msg_bits(m, 9, 0, 0xffff);
800 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
802 msg_set_bits(m, 9, 0, 0xffff, n);
805 static inline u32 msg_max_pkt(struct tipc_msg *m)
807 return msg_bits(m, 9, 16, 0xffff) * 4;
810 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
812 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
815 static inline u32 msg_link_tolerance(struct tipc_msg *m)
817 return msg_bits(m, 9, 0, 0xffff);
820 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
822 msg_set_bits(m, 9, 0, 0xffff, n);
825 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
827 return msg_bits(m, 9, 16, 0xffff);
830 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
832 msg_set_bits(m, 9, 16, 0xffff, n);
837 static inline u16 msg_grp_evt(struct tipc_msg *m)
839 return msg_bits(m, 10, 0, 0x3);
842 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
844 msg_set_bits(m, 10, 0, 0x3, n);
847 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
849 return msg_bits(m, 10, 16, 0xffff);
852 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
854 msg_set_bits(m, 10, 16, 0xffff, n);
857 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
859 if (likely(msg_user(m) != LINK_PROTOCOL))
861 if (msg_type(m) == STATE_MSG)
866 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
868 if (msg_peer_link_is_up(m))
870 return msg_redundant_link(m);
873 static inline bool msg_is_reset(struct tipc_msg *hdr)
875 return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
878 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
879 bool tipc_msg_validate(struct sk_buff *skb);
880 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
881 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
882 struct sk_buff_head *xmitq);
883 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
884 u32 hsize, u32 destnode);
885 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
886 uint data_sz, u32 dnode, u32 onode,
887 u32 dport, u32 oport, int errcode);
888 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
889 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
890 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
892 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
893 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
894 int offset, int dsz, int mtu, struct sk_buff_head *list);
895 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
896 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
897 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
898 struct sk_buff_head *cpy);
899 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
900 struct sk_buff *skb);
902 static inline u16 buf_seqno(struct sk_buff *skb)
904 return msg_seqno(buf_msg(skb));
907 /* tipc_skb_peek(): peek and reserve first buffer in list
908 * @list: list to be peeked in
909 * Returns pointer to first buffer in list, if any
911 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
917 skb = skb_peek(list);
920 spin_unlock_bh(lock);
924 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
925 * up to and including 'filter'.
926 * Note: ignoring previously tried destinations minimizes the risk of
927 * contention on the socket lock
928 * @list: list to be peeked in
929 * @filter: last destination to be ignored from search
930 * Returns a destination port number, of applicable.
932 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
938 spin_lock_bh(&list->lock);
939 skb_queue_walk(list, skb) {
940 dport = msg_destport(buf_msg(skb));
941 if (!filter || skb_queue_is_last(list, skb))
948 spin_unlock_bh(&list->lock);
952 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
953 * @list: list to be unlinked from
954 * @dport: selection criteria for buffer to unlink
956 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
959 struct sk_buff *_skb, *tmp, *skb = NULL;
961 spin_lock_bh(&list->lock);
962 skb_queue_walk_safe(list, _skb, tmp) {
963 if (msg_destport(buf_msg(_skb)) == dport) {
964 __skb_unlink(_skb, list);
969 spin_unlock_bh(&list->lock);
973 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
974 * @list: the new list to append. Not lock protected
975 * @head: target list. Lock protected.
977 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
978 struct sk_buff_head *head)
980 spin_lock_bh(&head->lock);
981 skb_queue_splice_tail(list, head);
982 spin_unlock_bh(&head->lock);
985 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
986 * @list: the new list to add. Lock protected. Will be reinitialized
987 * @head: target list. Lock protected.
989 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
990 struct sk_buff_head *head)
992 struct sk_buff_head tmp;
994 __skb_queue_head_init(&tmp);
996 spin_lock_bh(&list->lock);
997 skb_queue_splice_tail_init(list, &tmp);
998 spin_unlock_bh(&list->lock);
999 tipc_skb_queue_splice_tail(&tmp, head);