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1/*
2 * net/tipc/msg.h: Include file for TIPC message header routines
3 *
4 * Copyright (c) 2000-2007, 2014-2017 Ericsson AB
5 * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
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.
19 *
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.
23 *
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
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.
35 */
36
37#ifndef _TIPC_MSG_H
38#define _TIPC_MSG_H
39
40#include <linux/tipc.h>
41#include "core.h"
42
43/*
44 * Constants and routines used to read and write TIPC payload message headers
45 *
46 * Note: Some items are also used with TIPC internal message headers
47 */
48#define TIPC_VERSION 2
49struct plist;
50
51/*
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
57 */
58#define TIPC_SYSTEM_IMPORTANCE 4
59
60
61/*
62 * Payload message types
63 */
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
72
73/*
74 * Internal message users
75 */
76#define BCAST_PROTOCOL 5
77#define MSG_BUNDLER 6
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 MSG_CRYPTO 14
86#define SOCK_WAKEUP 14 /* pseudo user */
87#define TOP_SRV 15 /* pseudo user */
88
89/*
90 * Message header sizes
91 */
92#define SHORT_H_SIZE 24 /* In-cluster basic payload message */
93#define BASIC_H_SIZE 32 /* Basic payload message */
94#define NAMED_H_SIZE 40 /* Named payload message */
95#define MCAST_H_SIZE 44 /* Multicast payload message */
96#define GROUP_H_SIZE 44 /* Group payload message */
97#define INT_H_SIZE 40 /* Internal messages */
98#define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
99#define MAX_H_SIZE 60 /* Largest possible TIPC header size */
100
101#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
102#define TIPC_MEDIA_INFO_OFFSET 5
103
104extern const int one_page_mtu;
105
106struct tipc_skb_cb {
107 union {
108 struct {
109 struct sk_buff *tail;
110 unsigned long nxt_retr;
111 unsigned long retr_stamp;
112 u32 bytes_read;
113 u32 orig_member;
114 u16 chain_imp;
115 u16 ackers;
116 u16 retr_cnt;
117 } __packed;
118#ifdef CONFIG_TIPC_CRYPTO
119 struct {
120 struct tipc_crypto *rx;
121 struct tipc_aead *last;
122 u8 recurs;
123 } tx_clone_ctx __packed;
124#endif
125 } __packed;
126 union {
127 struct {
128 u8 validated:1;
129#ifdef CONFIG_TIPC_CRYPTO
130 u8 encrypted:1;
131 u8 decrypted:1;
132#define SKB_PROBING 1
133#define SKB_GRACING 2
134 u8 xmit_type:2;
135 u8 tx_clone_deferred:1;
136#endif
137 };
138 u8 flags;
139 };
140 u8 reserved;
141#ifdef CONFIG_TIPC_CRYPTO
142 void *crypto_ctx;
143#endif
144} __packed;
145
146#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
147
148struct tipc_msg {
149 __be32 hdr[15];
150};
151
152/* struct tipc_gap_ack - TIPC Gap ACK block
153 * @ack: seqno of the last consecutive packet in link deferdq
154 * @gap: number of gap packets since the last ack
155 *
156 * E.g:
157 * link deferdq: 1 2 3 4 10 11 13 14 15 20
158 * --> Gap ACK blocks: <4, 5>, <11, 1>, <15, 4>, <20, 0>
159 */
160struct tipc_gap_ack {
161 __be16 ack;
162 __be16 gap;
163};
164
165/* struct tipc_gap_ack_blks
166 * @len: actual length of the record
167 * @ugack_cnt: number of Gap ACK blocks for unicast (following the broadcast
168 * ones)
169 * @start_index: starting index for "valid" broadcast Gap ACK blocks
170 * @bgack_cnt: number of Gap ACK blocks for broadcast in the record
171 * @gacks: array of Gap ACK blocks
172 *
173 * 31 16 15 0
174 * +-------------+-------------+-------------+-------------+
175 * | bgack_cnt | ugack_cnt | len |
176 * +-------------+-------------+-------------+-------------+ -
177 * | gap | ack | |
178 * +-------------+-------------+-------------+-------------+ > bc gacks
179 * : : : |
180 * +-------------+-------------+-------------+-------------+ -
181 * | gap | ack | |
182 * +-------------+-------------+-------------+-------------+ > uc gacks
183 * : : : |
184 * +-------------+-------------+-------------+-------------+ -
185 */
186struct tipc_gap_ack_blks {
187 __be16 len;
188 union {
189 u8 ugack_cnt;
190 u8 start_index;
191 };
192 u8 bgack_cnt;
193 struct tipc_gap_ack gacks[];
194};
195
196#define MAX_GAP_ACK_BLKS 128
197#define MAX_GAP_ACK_BLKS_SZ (sizeof(struct tipc_gap_ack_blks) + \
198 sizeof(struct tipc_gap_ack) * MAX_GAP_ACK_BLKS)
199
200static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
201{
202 return (struct tipc_msg *)skb->data;
203}
204
205static inline u32 msg_word(struct tipc_msg *m, u32 pos)
206{
207 return ntohl(m->hdr[pos]);
208}
209
210static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
211{
212 m->hdr[w] = htonl(val);
213}
214
215static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
216{
217 return (msg_word(m, w) >> pos) & mask;
218}
219
220static inline void msg_set_bits(struct tipc_msg *m, u32 w,
221 u32 pos, u32 mask, u32 val)
222{
223 val = (val & mask) << pos;
224 mask = mask << pos;
225 m->hdr[w] &= ~htonl(mask);
226 m->hdr[w] |= htonl(val);
227}
228
229/*
230 * Word 0
231 */
232static inline u32 msg_version(struct tipc_msg *m)
233{
234 return msg_bits(m, 0, 29, 7);
235}
236
237static inline void msg_set_version(struct tipc_msg *m)
238{
239 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
240}
241
242static inline u32 msg_user(struct tipc_msg *m)
243{
244 return msg_bits(m, 0, 25, 0xf);
245}
246
247static inline u32 msg_isdata(struct tipc_msg *m)
248{
249 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
250}
251
252static inline void msg_set_user(struct tipc_msg *m, u32 n)
253{
254 msg_set_bits(m, 0, 25, 0xf, n);
255}
256
257static inline u32 msg_hdr_sz(struct tipc_msg *m)
258{
259 return msg_bits(m, 0, 21, 0xf) << 2;
260}
261
262static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
263{
264 msg_set_bits(m, 0, 21, 0xf, n>>2);
265}
266
267static inline u32 msg_size(struct tipc_msg *m)
268{
269 return msg_bits(m, 0, 0, 0x1ffff);
270}
271
272static inline u32 msg_blocks(struct tipc_msg *m)
273{
274 return (msg_size(m) / 1024) + 1;
275}
276
277static inline u32 msg_data_sz(struct tipc_msg *m)
278{
279 return msg_size(m) - msg_hdr_sz(m);
280}
281
282static inline int msg_non_seq(struct tipc_msg *m)
283{
284 return msg_bits(m, 0, 20, 1);
285}
286
287static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
288{
289 msg_set_bits(m, 0, 20, 1, n);
290}
291
292static inline int msg_is_syn(struct tipc_msg *m)
293{
294 return msg_bits(m, 0, 17, 1);
295}
296
297static inline void msg_set_syn(struct tipc_msg *m, u32 d)
298{
299 msg_set_bits(m, 0, 17, 1, d);
300}
301
302static inline int msg_dest_droppable(struct tipc_msg *m)
303{
304 return msg_bits(m, 0, 19, 1);
305}
306
307static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
308{
309 msg_set_bits(m, 0, 19, 1, d);
310}
311
312static inline int msg_is_keepalive(struct tipc_msg *m)
313{
314 return msg_bits(m, 0, 19, 1);
315}
316
317static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
318{
319 msg_set_bits(m, 0, 19, 1, d);
320}
321
322static inline int msg_src_droppable(struct tipc_msg *m)
323{
324 return msg_bits(m, 0, 18, 1);
325}
326
327static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
328{
329 msg_set_bits(m, 0, 18, 1, d);
330}
331
332static inline int msg_ack_required(struct tipc_msg *m)
333{
334 return msg_bits(m, 0, 18, 1);
335}
336
337static inline void msg_set_ack_required(struct tipc_msg *m)
338{
339 msg_set_bits(m, 0, 18, 1, 1);
340}
341
342static inline int msg_nagle_ack(struct tipc_msg *m)
343{
344 return msg_bits(m, 0, 18, 1);
345}
346
347static inline void msg_set_nagle_ack(struct tipc_msg *m)
348{
349 msg_set_bits(m, 0, 18, 1, 1);
350}
351
352static inline bool msg_is_rcast(struct tipc_msg *m)
353{
354 return msg_bits(m, 0, 18, 0x1);
355}
356
357static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
358{
359 msg_set_bits(m, 0, 18, 0x1, d);
360}
361
362static inline void msg_set_size(struct tipc_msg *m, u32 sz)
363{
364 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
365}
366
367static inline unchar *msg_data(struct tipc_msg *m)
368{
369 return ((unchar *)m) + msg_hdr_sz(m);
370}
371
372static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
373{
374 return (struct tipc_msg *)msg_data(m);
375}
376
377/*
378 * Word 1
379 */
380static inline u32 msg_type(struct tipc_msg *m)
381{
382 return msg_bits(m, 1, 29, 0x7);
383}
384
385static inline void msg_set_type(struct tipc_msg *m, u32 n)
386{
387 msg_set_bits(m, 1, 29, 0x7, n);
388}
389
390static inline int msg_in_group(struct tipc_msg *m)
391{
392 int mtyp = msg_type(m);
393
394 return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
395}
396
397static inline bool msg_is_grp_evt(struct tipc_msg *m)
398{
399 return msg_type(m) == TIPC_GRP_MEMBER_EVT;
400}
401
402static inline u32 msg_named(struct tipc_msg *m)
403{
404 return msg_type(m) == TIPC_NAMED_MSG;
405}
406
407static inline u32 msg_mcast(struct tipc_msg *m)
408{
409 int mtyp = msg_type(m);
410
411 return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
412 (mtyp == TIPC_GRP_MCAST_MSG));
413}
414
415static inline u32 msg_connected(struct tipc_msg *m)
416{
417 return msg_type(m) == TIPC_CONN_MSG;
418}
419
420static inline u32 msg_direct(struct tipc_msg *m)
421{
422 return msg_type(m) == TIPC_DIRECT_MSG;
423}
424
425static inline u32 msg_errcode(struct tipc_msg *m)
426{
427 return msg_bits(m, 1, 25, 0xf);
428}
429
430static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
431{
432 msg_set_bits(m, 1, 25, 0xf, err);
433}
434
435static inline void msg_set_bulk(struct tipc_msg *m)
436{
437 msg_set_bits(m, 1, 28, 0x1, 1);
438}
439
440static inline u32 msg_is_bulk(struct tipc_msg *m)
441{
442 return msg_bits(m, 1, 28, 0x1);
443}
444
445static inline void msg_set_last_bulk(struct tipc_msg *m)
446{
447 msg_set_bits(m, 1, 27, 0x1, 1);
448}
449
450static inline u32 msg_is_last_bulk(struct tipc_msg *m)
451{
452 return msg_bits(m, 1, 27, 0x1);
453}
454
455static inline void msg_set_non_legacy(struct tipc_msg *m)
456{
457 msg_set_bits(m, 1, 26, 0x1, 1);
458}
459
460static inline u32 msg_is_legacy(struct tipc_msg *m)
461{
462 return !msg_bits(m, 1, 26, 0x1);
463}
464
465static inline u32 msg_reroute_cnt(struct tipc_msg *m)
466{
467 return msg_bits(m, 1, 21, 0xf);
468}
469
470static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
471{
472 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
473}
474
475static inline u32 msg_lookup_scope(struct tipc_msg *m)
476{
477 return msg_bits(m, 1, 19, 0x3);
478}
479
480static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
481{
482 msg_set_bits(m, 1, 19, 0x3, n);
483}
484
485static inline u16 msg_bcast_ack(struct tipc_msg *m)
486{
487 return msg_bits(m, 1, 0, 0xffff);
488}
489
490static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
491{
492 msg_set_bits(m, 1, 0, 0xffff, n);
493}
494
495/* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
496 * link peer session number
497 */
498static inline bool msg_dest_session_valid(struct tipc_msg *m)
499{
500 return msg_bits(m, 1, 16, 0x1);
501}
502
503static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
504{
505 msg_set_bits(m, 1, 16, 0x1, valid);
506}
507
508static inline u16 msg_dest_session(struct tipc_msg *m)
509{
510 return msg_bits(m, 1, 0, 0xffff);
511}
512
513static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
514{
515 msg_set_bits(m, 1, 0, 0xffff, n);
516}
517
518/*
519 * Word 2
520 */
521static inline u16 msg_ack(struct tipc_msg *m)
522{
523 return msg_bits(m, 2, 16, 0xffff);
524}
525
526static inline void msg_set_ack(struct tipc_msg *m, u16 n)
527{
528 msg_set_bits(m, 2, 16, 0xffff, n);
529}
530
531static inline u16 msg_seqno(struct tipc_msg *m)
532{
533 return msg_bits(m, 2, 0, 0xffff);
534}
535
536static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
537{
538 msg_set_bits(m, 2, 0, 0xffff, n);
539}
540
541/*
542 * Words 3-10
543 */
544static inline u32 msg_importance(struct tipc_msg *m)
545{
546 int usr = msg_user(m);
547
548 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
549 return usr;
550 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
551 return msg_bits(m, 9, 0, 0x7);
552 return TIPC_SYSTEM_IMPORTANCE;
553}
554
555static inline void msg_set_importance(struct tipc_msg *m, u32 i)
556{
557 int usr = msg_user(m);
558
559 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
560 msg_set_bits(m, 9, 0, 0x7, i);
561 else if (i < TIPC_SYSTEM_IMPORTANCE)
562 msg_set_user(m, i);
563 else
564 pr_warn("Trying to set illegal importance in message\n");
565}
566
567static inline u32 msg_prevnode(struct tipc_msg *m)
568{
569 return msg_word(m, 3);
570}
571
572static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
573{
574 msg_set_word(m, 3, a);
575}
576
577static inline u32 msg_origport(struct tipc_msg *m)
578{
579 if (msg_user(m) == MSG_FRAGMENTER)
580 m = msg_inner_hdr(m);
581 return msg_word(m, 4);
582}
583
584static inline void msg_set_origport(struct tipc_msg *m, u32 p)
585{
586 msg_set_word(m, 4, p);
587}
588
589static inline u16 msg_named_seqno(struct tipc_msg *m)
590{
591 return msg_bits(m, 4, 0, 0xffff);
592}
593
594static inline void msg_set_named_seqno(struct tipc_msg *m, u16 n)
595{
596 msg_set_bits(m, 4, 0, 0xffff, n);
597}
598
599static inline u32 msg_destport(struct tipc_msg *m)
600{
601 return msg_word(m, 5);
602}
603
604static inline void msg_set_destport(struct tipc_msg *m, u32 p)
605{
606 msg_set_word(m, 5, p);
607}
608
609static inline u32 msg_mc_netid(struct tipc_msg *m)
610{
611 return msg_word(m, 5);
612}
613
614static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
615{
616 msg_set_word(m, 5, p);
617}
618
619static inline int msg_short(struct tipc_msg *m)
620{
621 return msg_hdr_sz(m) == SHORT_H_SIZE;
622}
623
624static inline u32 msg_orignode(struct tipc_msg *m)
625{
626 if (likely(msg_short(m)))
627 return msg_prevnode(m);
628 return msg_word(m, 6);
629}
630
631static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
632{
633 msg_set_word(m, 6, a);
634}
635
636static inline u32 msg_destnode(struct tipc_msg *m)
637{
638 return msg_word(m, 7);
639}
640
641static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
642{
643 msg_set_word(m, 7, a);
644}
645
646static inline u32 msg_nametype(struct tipc_msg *m)
647{
648 return msg_word(m, 8);
649}
650
651static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
652{
653 msg_set_word(m, 8, n);
654}
655
656static inline u32 msg_nameinst(struct tipc_msg *m)
657{
658 return msg_word(m, 9);
659}
660
661static inline u32 msg_namelower(struct tipc_msg *m)
662{
663 return msg_nameinst(m);
664}
665
666static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
667{
668 msg_set_word(m, 9, n);
669}
670
671static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
672{
673 msg_set_namelower(m, n);
674}
675
676static inline u32 msg_nameupper(struct tipc_msg *m)
677{
678 return msg_word(m, 10);
679}
680
681static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
682{
683 msg_set_word(m, 10, n);
684}
685
686/*
687 * Constants and routines used to read and write TIPC internal message headers
688 */
689
690/*
691 * Connection management protocol message types
692 */
693#define CONN_PROBE 0
694#define CONN_PROBE_REPLY 1
695#define CONN_ACK 2
696
697/*
698 * Name distributor message types
699 */
700#define PUBLICATION 0
701#define WITHDRAWAL 1
702
703/*
704 * Segmentation message types
705 */
706#define FIRST_FRAGMENT 0
707#define FRAGMENT 1
708#define LAST_FRAGMENT 2
709
710/*
711 * Link management protocol message types
712 */
713#define STATE_MSG 0
714#define RESET_MSG 1
715#define ACTIVATE_MSG 2
716
717/*
718 * Changeover tunnel message types
719 */
720#define SYNCH_MSG 0
721#define FAILOVER_MSG 1
722
723/*
724 * Config protocol message types
725 */
726#define DSC_REQ_MSG 0
727#define DSC_RESP_MSG 1
728#define DSC_TRIAL_MSG 2
729#define DSC_TRIAL_FAIL_MSG 3
730
731/*
732 * Group protocol message types
733 */
734#define GRP_JOIN_MSG 0
735#define GRP_LEAVE_MSG 1
736#define GRP_ADV_MSG 2
737#define GRP_ACK_MSG 3
738#define GRP_RECLAIM_MSG 4
739#define GRP_REMIT_MSG 5
740
741/* Crypto message types */
742#define KEY_DISTR_MSG 0
743
744/*
745 * Word 1
746 */
747static inline u32 msg_seq_gap(struct tipc_msg *m)
748{
749 return msg_bits(m, 1, 16, 0x1fff);
750}
751
752static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
753{
754 msg_set_bits(m, 1, 16, 0x1fff, n);
755}
756
757static inline u32 msg_node_sig(struct tipc_msg *m)
758{
759 return msg_bits(m, 1, 0, 0xffff);
760}
761
762static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
763{
764 msg_set_bits(m, 1, 0, 0xffff, n);
765}
766
767static inline u32 msg_node_capabilities(struct tipc_msg *m)
768{
769 return msg_bits(m, 1, 15, 0x1fff);
770}
771
772static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
773{
774 msg_set_bits(m, 1, 15, 0x1fff, n);
775}
776
777/*
778 * Word 2
779 */
780static inline u32 msg_dest_domain(struct tipc_msg *m)
781{
782 return msg_word(m, 2);
783}
784
785static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
786{
787 msg_set_word(m, 2, n);
788}
789
790static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
791{
792 msg_set_bits(m, 2, 16, 0xffff, n);
793}
794
795static inline u32 msg_bcgap_to(struct tipc_msg *m)
796{
797 return msg_bits(m, 2, 0, 0xffff);
798}
799
800static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
801{
802 msg_set_bits(m, 2, 0, 0xffff, n);
803}
804
805/*
806 * Word 4
807 */
808static inline u32 msg_last_bcast(struct tipc_msg *m)
809{
810 return msg_bits(m, 4, 16, 0xffff);
811}
812
813static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
814{
815 return msg_last_bcast(m) + 1;
816}
817
818static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
819{
820 msg_set_bits(m, 4, 16, 0xffff, n);
821}
822
823static inline u32 msg_nof_fragms(struct tipc_msg *m)
824{
825 return msg_bits(m, 4, 0, 0xffff);
826}
827
828static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
829{
830 msg_set_bits(m, 4, 0, 0xffff, n);
831}
832
833static inline u32 msg_fragm_no(struct tipc_msg *m)
834{
835 return msg_bits(m, 4, 16, 0xffff);
836}
837
838static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
839{
840 msg_set_bits(m, 4, 16, 0xffff, n);
841}
842
843static inline u16 msg_next_sent(struct tipc_msg *m)
844{
845 return msg_bits(m, 4, 0, 0xffff);
846}
847
848static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
849{
850 msg_set_bits(m, 4, 0, 0xffff, n);
851}
852
853static inline u32 msg_bc_netid(struct tipc_msg *m)
854{
855 return msg_word(m, 4);
856}
857
858static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
859{
860 msg_set_word(m, 4, id);
861}
862
863static inline u32 msg_link_selector(struct tipc_msg *m)
864{
865 if (msg_user(m) == MSG_FRAGMENTER)
866 m = (void *)msg_data(m);
867 return msg_bits(m, 4, 0, 1);
868}
869
870/*
871 * Word 5
872 */
873static inline u16 msg_session(struct tipc_msg *m)
874{
875 return msg_bits(m, 5, 16, 0xffff);
876}
877
878static inline void msg_set_session(struct tipc_msg *m, u16 n)
879{
880 msg_set_bits(m, 5, 16, 0xffff, n);
881}
882
883static inline u32 msg_probe(struct tipc_msg *m)
884{
885 return msg_bits(m, 5, 0, 1);
886}
887
888static inline void msg_set_probe(struct tipc_msg *m, u32 val)
889{
890 msg_set_bits(m, 5, 0, 1, val);
891}
892
893static inline char msg_net_plane(struct tipc_msg *m)
894{
895 return msg_bits(m, 5, 1, 7) + 'A';
896}
897
898static inline void msg_set_net_plane(struct tipc_msg *m, char n)
899{
900 msg_set_bits(m, 5, 1, 7, (n - 'A'));
901}
902
903static inline u32 msg_linkprio(struct tipc_msg *m)
904{
905 return msg_bits(m, 5, 4, 0x1f);
906}
907
908static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
909{
910 msg_set_bits(m, 5, 4, 0x1f, n);
911}
912
913static inline u32 msg_bearer_id(struct tipc_msg *m)
914{
915 return msg_bits(m, 5, 9, 0x7);
916}
917
918static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
919{
920 msg_set_bits(m, 5, 9, 0x7, n);
921}
922
923static inline u32 msg_redundant_link(struct tipc_msg *m)
924{
925 return msg_bits(m, 5, 12, 0x1);
926}
927
928static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
929{
930 msg_set_bits(m, 5, 12, 0x1, r);
931}
932
933static inline u32 msg_peer_stopping(struct tipc_msg *m)
934{
935 return msg_bits(m, 5, 13, 0x1);
936}
937
938static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
939{
940 msg_set_bits(m, 5, 13, 0x1, s);
941}
942
943static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
944{
945 switch (msg_user(m)) {
946 case BCAST_PROTOCOL:
947 case NAME_DISTRIBUTOR:
948 case LINK_PROTOCOL:
949 return msg_bits(m, 5, 14, 0x1);
950 default:
951 return false;
952 }
953}
954
955static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
956{
957 msg_set_bits(m, 5, 14, 0x1, invalid);
958}
959
960static inline char *msg_media_addr(struct tipc_msg *m)
961{
962 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
963}
964
965static inline u32 msg_bc_gap(struct tipc_msg *m)
966{
967 return msg_bits(m, 8, 0, 0x3ff);
968}
969
970static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
971{
972 msg_set_bits(m, 8, 0, 0x3ff, n);
973}
974
975/*
976 * Word 9
977 */
978static inline u16 msg_msgcnt(struct tipc_msg *m)
979{
980 return msg_bits(m, 9, 16, 0xffff);
981}
982
983static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
984{
985 msg_set_bits(m, 9, 16, 0xffff, n);
986}
987
988static inline u16 msg_syncpt(struct tipc_msg *m)
989{
990 return msg_bits(m, 9, 16, 0xffff);
991}
992
993static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
994{
995 msg_set_bits(m, 9, 16, 0xffff, n);
996}
997
998static inline u32 msg_conn_ack(struct tipc_msg *m)
999{
1000 return msg_bits(m, 9, 16, 0xffff);
1001}
1002
1003static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
1004{
1005 msg_set_bits(m, 9, 16, 0xffff, n);
1006}
1007
1008static inline u16 msg_adv_win(struct tipc_msg *m)
1009{
1010 return msg_bits(m, 9, 0, 0xffff);
1011}
1012
1013static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
1014{
1015 msg_set_bits(m, 9, 0, 0xffff, n);
1016}
1017
1018static inline u32 msg_max_pkt(struct tipc_msg *m)
1019{
1020 return msg_bits(m, 9, 16, 0xffff) * 4;
1021}
1022
1023static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
1024{
1025 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
1026}
1027
1028static inline u32 msg_link_tolerance(struct tipc_msg *m)
1029{
1030 return msg_bits(m, 9, 0, 0xffff);
1031}
1032
1033static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
1034{
1035 msg_set_bits(m, 9, 0, 0xffff, n);
1036}
1037
1038static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
1039{
1040 return msg_bits(m, 9, 16, 0xffff);
1041}
1042
1043static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
1044{
1045 msg_set_bits(m, 9, 16, 0xffff, n);
1046}
1047
1048static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
1049{
1050 return msg_bits(m, 9, 16, 0xffff);
1051}
1052
1053static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
1054{
1055 msg_set_bits(m, 9, 16, 0xffff, n);
1056}
1057
1058static inline u16 msg_grp_remitted(struct tipc_msg *m)
1059{
1060 return msg_bits(m, 9, 16, 0xffff);
1061}
1062
1063static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
1064{
1065 msg_set_bits(m, 9, 16, 0xffff, n);
1066}
1067
1068/* Word 10
1069 */
1070static inline u16 msg_grp_evt(struct tipc_msg *m)
1071{
1072 return msg_bits(m, 10, 0, 0x3);
1073}
1074
1075static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
1076{
1077 msg_set_bits(m, 10, 0, 0x3, n);
1078}
1079
1080static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
1081{
1082 return msg_bits(m, 10, 0, 0x1);
1083}
1084
1085static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
1086{
1087 msg_set_bits(m, 10, 0, 0x1, n);
1088}
1089
1090static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
1091{
1092 return msg_bits(m, 10, 16, 0xffff);
1093}
1094
1095static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
1096{
1097 msg_set_bits(m, 10, 16, 0xffff, n);
1098}
1099
1100static inline bool msg_peer_link_is_up(struct tipc_msg *m)
1101{
1102 if (likely(msg_user(m) != LINK_PROTOCOL))
1103 return true;
1104 if (msg_type(m) == STATE_MSG)
1105 return true;
1106 return false;
1107}
1108
1109static inline bool msg_peer_node_is_up(struct tipc_msg *m)
1110{
1111 if (msg_peer_link_is_up(m))
1112 return true;
1113 return msg_redundant_link(m);
1114}
1115
1116static inline bool msg_is_reset(struct tipc_msg *hdr)
1117{
1118 return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
1119}
1120
1121/* Word 13
1122 */
1123static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n)
1124{
1125 msg_set_word(m, 13, n);
1126}
1127
1128static inline u32 msg_peer_net_hash(struct tipc_msg *m)
1129{
1130 return msg_word(m, 13);
1131}
1132
1133/* Word 14
1134 */
1135static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
1136{
1137 return msg_word(m, 14);
1138}
1139
1140static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
1141{
1142 msg_set_word(m, 14, n);
1143}
1144
1145static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
1146{
1147 memcpy(msg_data(hdr), id, 16);
1148}
1149
1150static inline u8 *msg_node_id(struct tipc_msg *hdr)
1151{
1152 return (u8 *)msg_data(hdr);
1153}
1154
1155struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
1156bool tipc_msg_validate(struct sk_buff **_skb);
1157bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
1158void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
1159 struct sk_buff_head *xmitq);
1160void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
1161 u32 hsize, u32 destnode);
1162struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
1163 uint data_sz, u32 dnode, u32 onode,
1164 u32 dport, u32 oport, int errcode);
1165int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
1166bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss,
1167 u32 dnode, bool *new_bundle);
1168bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
1169int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
1170 int pktmax, struct sk_buff_head *frags);
1171int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
1172 int offset, int dsz, int mtu, struct sk_buff_head *list);
1173int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen,
1174 int mss, struct sk_buff_head *txq);
1175bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1176bool tipc_msg_assemble(struct sk_buff_head *list);
1177bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1178bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1179 struct sk_buff_head *cpy);
1180bool __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1181 struct sk_buff *skb);
1182bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1183
1184static inline u16 buf_seqno(struct sk_buff *skb)
1185{
1186 return msg_seqno(buf_msg(skb));
1187}
1188
1189static inline int buf_roundup_len(struct sk_buff *skb)
1190{
1191 return (skb->len / 1024 + 1) * 1024;
1192}
1193
1194/* tipc_skb_peek(): peek and reserve first buffer in list
1195 * @list: list to be peeked in
1196 * Returns pointer to first buffer in list, if any
1197 */
1198static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1199 spinlock_t *lock)
1200{
1201 struct sk_buff *skb;
1202
1203 spin_lock_bh(lock);
1204 skb = skb_peek(list);
1205 if (skb)
1206 skb_get(skb);
1207 spin_unlock_bh(lock);
1208 return skb;
1209}
1210
1211/* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1212 * up to and including 'filter'.
1213 * Note: ignoring previously tried destinations minimizes the risk of
1214 * contention on the socket lock
1215 * @list: list to be peeked in
1216 * @filter: last destination to be ignored from search
1217 * Returns a destination port number, of applicable.
1218 */
1219static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1220{
1221 struct sk_buff *skb;
1222 u32 dport = 0;
1223 bool ignore = true;
1224
1225 spin_lock_bh(&list->lock);
1226 skb_queue_walk(list, skb) {
1227 dport = msg_destport(buf_msg(skb));
1228 if (!filter || skb_queue_is_last(list, skb))
1229 break;
1230 if (dport == filter)
1231 ignore = false;
1232 else if (!ignore)
1233 break;
1234 }
1235 spin_unlock_bh(&list->lock);
1236 return dport;
1237}
1238
1239/* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1240 * @list: list to be unlinked from
1241 * @dport: selection criteria for buffer to unlink
1242 */
1243static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1244 u32 dport)
1245{
1246 struct sk_buff *_skb, *tmp, *skb = NULL;
1247
1248 spin_lock_bh(&list->lock);
1249 skb_queue_walk_safe(list, _skb, tmp) {
1250 if (msg_destport(buf_msg(_skb)) == dport) {
1251 __skb_unlink(_skb, list);
1252 skb = _skb;
1253 break;
1254 }
1255 }
1256 spin_unlock_bh(&list->lock);
1257 return skb;
1258}
1259
1260/* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1261 * @list: the new list to append. Not lock protected
1262 * @head: target list. Lock protected.
1263 */
1264static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1265 struct sk_buff_head *head)
1266{
1267 spin_lock_bh(&head->lock);
1268 skb_queue_splice_tail(list, head);
1269 spin_unlock_bh(&head->lock);
1270}
1271
1272/* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1273 * @list: the new list to add. Lock protected. Will be reinitialized
1274 * @head: target list. Lock protected.
1275 */
1276static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1277 struct sk_buff_head *head)
1278{
1279 struct sk_buff_head tmp;
1280
1281 __skb_queue_head_init(&tmp);
1282
1283 spin_lock_bh(&list->lock);
1284 skb_queue_splice_tail_init(list, &tmp);
1285 spin_unlock_bh(&list->lock);
1286 tipc_skb_queue_splice_tail(&tmp, head);
1287}
1288
1289/* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
1290 * @list: list to be dequeued from
1291 * @seqno: seqno of the expected msg
1292 *
1293 * returns skb dequeued from the list if its seqno is less than or equal to
1294 * the expected one, otherwise the skb is still hold
1295 *
1296 * Note: must be used with appropriate locks held only
1297 */
1298static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
1299 u16 seqno)
1300{
1301 struct sk_buff *skb = skb_peek(list);
1302
1303 if (skb && less_eq(buf_seqno(skb), seqno)) {
1304 __skb_unlink(skb, list);
1305 return skb;
1306 }
1307 return NULL;
1308}
1309
1310#endif