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TOMOYO Linux Cross Reference
Linux/net/tipc/msg.h

Version: ~ [ linux-5.9-rc5 ] ~ [ linux-5.8.10 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.66 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.146 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.198 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.236 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.236 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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
 49 struct 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  SOCK_WAKEUP          14       /* pseudo user */
 86 #define  TOP_SRV              15       /* pseudo user */
 87 
 88 /*
 89  * Message header sizes
 90  */
 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 */
 99 
100 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
101 #define FB_MTU                  3744
102 #define TIPC_MEDIA_INFO_OFFSET  5
103 
104 struct tipc_skb_cb {
105         u32 bytes_read;
106         u32 orig_member;
107         struct sk_buff *tail;
108         bool validated;
109         u16 chain_imp;
110         u16 ackers;
111 };
112 
113 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
114 
115 struct tipc_msg {
116         __be32 hdr[15];
117 };
118 
119 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
120 {
121         return (struct tipc_msg *)skb->data;
122 }
123 
124 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
125 {
126         return ntohl(m->hdr[pos]);
127 }
128 
129 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
130 {
131         m->hdr[w] = htonl(val);
132 }
133 
134 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
135 {
136         return (msg_word(m, w) >> pos) & mask;
137 }
138 
139 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
140                                 u32 pos, u32 mask, u32 val)
141 {
142         val = (val & mask) << pos;
143         mask = mask << pos;
144         m->hdr[w] &= ~htonl(mask);
145         m->hdr[w] |= htonl(val);
146 }
147 
148 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
149 {
150         u32 temp = msg->hdr[a];
151 
152         msg->hdr[a] = msg->hdr[b];
153         msg->hdr[b] = temp;
154 }
155 
156 /*
157  * Word 0
158  */
159 static inline u32 msg_version(struct tipc_msg *m)
160 {
161         return msg_bits(m, 0, 29, 7);
162 }
163 
164 static inline void msg_set_version(struct tipc_msg *m)
165 {
166         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
167 }
168 
169 static inline u32 msg_user(struct tipc_msg *m)
170 {
171         return msg_bits(m, 0, 25, 0xf);
172 }
173 
174 static inline u32 msg_isdata(struct tipc_msg *m)
175 {
176         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
177 }
178 
179 static inline void msg_set_user(struct tipc_msg *m, u32 n)
180 {
181         msg_set_bits(m, 0, 25, 0xf, n);
182 }
183 
184 static inline u32 msg_hdr_sz(struct tipc_msg *m)
185 {
186         return msg_bits(m, 0, 21, 0xf) << 2;
187 }
188 
189 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
190 {
191         msg_set_bits(m, 0, 21, 0xf, n>>2);
192 }
193 
194 static inline u32 msg_size(struct tipc_msg *m)
195 {
196         return msg_bits(m, 0, 0, 0x1ffff);
197 }
198 
199 static inline u32 msg_blocks(struct tipc_msg *m)
200 {
201         return (msg_size(m) / 1024) + 1;
202 }
203 
204 static inline u32 msg_data_sz(struct tipc_msg *m)
205 {
206         return msg_size(m) - msg_hdr_sz(m);
207 }
208 
209 static inline int msg_non_seq(struct tipc_msg *m)
210 {
211         return msg_bits(m, 0, 20, 1);
212 }
213 
214 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
215 {
216         msg_set_bits(m, 0, 20, 1, n);
217 }
218 
219 static inline int msg_dest_droppable(struct tipc_msg *m)
220 {
221         return msg_bits(m, 0, 19, 1);
222 }
223 
224 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
225 {
226         msg_set_bits(m, 0, 19, 1, d);
227 }
228 
229 static inline int msg_is_keepalive(struct tipc_msg *m)
230 {
231         return msg_bits(m, 0, 19, 1);
232 }
233 
234 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
235 {
236         msg_set_bits(m, 0, 19, 1, d);
237 }
238 
239 static inline int msg_src_droppable(struct tipc_msg *m)
240 {
241         return msg_bits(m, 0, 18, 1);
242 }
243 
244 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
245 {
246         msg_set_bits(m, 0, 18, 1, d);
247 }
248 
249 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
250 {
251         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
252 }
253 
254 static inline unchar *msg_data(struct tipc_msg *m)
255 {
256         return ((unchar *)m) + msg_hdr_sz(m);
257 }
258 
259 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
260 {
261         return (struct tipc_msg *)msg_data(m);
262 }
263 
264 /*
265  * Word 1
266  */
267 static inline u32 msg_type(struct tipc_msg *m)
268 {
269         return msg_bits(m, 1, 29, 0x7);
270 }
271 
272 static inline void msg_set_type(struct tipc_msg *m, u32 n)
273 {
274         msg_set_bits(m, 1, 29, 0x7, n);
275 }
276 
277 static inline int msg_in_group(struct tipc_msg *m)
278 {
279         int mtyp = msg_type(m);
280 
281         return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
282 }
283 
284 static inline bool msg_is_grp_evt(struct tipc_msg *m)
285 {
286         return msg_type(m) == TIPC_GRP_MEMBER_EVT;
287 }
288 
289 static inline u32 msg_named(struct tipc_msg *m)
290 {
291         return msg_type(m) == TIPC_NAMED_MSG;
292 }
293 
294 static inline u32 msg_mcast(struct tipc_msg *m)
295 {
296         int mtyp = msg_type(m);
297 
298         return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
299                 (mtyp == TIPC_GRP_MCAST_MSG));
300 }
301 
302 static inline u32 msg_connected(struct tipc_msg *m)
303 {
304         return msg_type(m) == TIPC_CONN_MSG;
305 }
306 
307 static inline u32 msg_errcode(struct tipc_msg *m)
308 {
309         return msg_bits(m, 1, 25, 0xf);
310 }
311 
312 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
313 {
314         msg_set_bits(m, 1, 25, 0xf, err);
315 }
316 
317 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
318 {
319         return msg_bits(m, 1, 21, 0xf);
320 }
321 
322 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
323 {
324         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
325 }
326 
327 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
328 {
329         msg_set_bits(m, 1, 21, 0xf, 0);
330 }
331 
332 static inline u32 msg_lookup_scope(struct tipc_msg *m)
333 {
334         return msg_bits(m, 1, 19, 0x3);
335 }
336 
337 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
338 {
339         msg_set_bits(m, 1, 19, 0x3, n);
340 }
341 
342 static inline u16 msg_bcast_ack(struct tipc_msg *m)
343 {
344         return msg_bits(m, 1, 0, 0xffff);
345 }
346 
347 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
348 {
349         msg_set_bits(m, 1, 0, 0xffff, n);
350 }
351 
352 
353 /*
354  * Word 2
355  */
356 static inline u16 msg_ack(struct tipc_msg *m)
357 {
358         return msg_bits(m, 2, 16, 0xffff);
359 }
360 
361 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
362 {
363         msg_set_bits(m, 2, 16, 0xffff, n);
364 }
365 
366 static inline u16 msg_seqno(struct tipc_msg *m)
367 {
368         return msg_bits(m, 2, 0, 0xffff);
369 }
370 
371 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
372 {
373         msg_set_bits(m, 2, 0, 0xffff, n);
374 }
375 
376 /*
377  * Words 3-10
378  */
379 static inline u32 msg_importance(struct tipc_msg *m)
380 {
381         int usr = msg_user(m);
382 
383         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
384                 return usr;
385         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
386                 return msg_bits(m, 9, 0, 0x7);
387         return TIPC_SYSTEM_IMPORTANCE;
388 }
389 
390 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
391 {
392         int usr = msg_user(m);
393 
394         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
395                 msg_set_bits(m, 9, 0, 0x7, i);
396         else if (i < TIPC_SYSTEM_IMPORTANCE)
397                 msg_set_user(m, i);
398         else
399                 pr_warn("Trying to set illegal importance in message\n");
400 }
401 
402 static inline u32 msg_prevnode(struct tipc_msg *m)
403 {
404         return msg_word(m, 3);
405 }
406 
407 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
408 {
409         msg_set_word(m, 3, a);
410 }
411 
412 static inline u32 msg_origport(struct tipc_msg *m)
413 {
414         if (msg_user(m) == MSG_FRAGMENTER)
415                 m = msg_get_wrapped(m);
416         return msg_word(m, 4);
417 }
418 
419 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
420 {
421         msg_set_word(m, 4, p);
422 }
423 
424 static inline u32 msg_destport(struct tipc_msg *m)
425 {
426         return msg_word(m, 5);
427 }
428 
429 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
430 {
431         msg_set_word(m, 5, p);
432 }
433 
434 static inline u32 msg_mc_netid(struct tipc_msg *m)
435 {
436         return msg_word(m, 5);
437 }
438 
439 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
440 {
441         msg_set_word(m, 5, p);
442 }
443 
444 static inline int msg_short(struct tipc_msg *m)
445 {
446         return msg_hdr_sz(m) == SHORT_H_SIZE;
447 }
448 
449 static inline u32 msg_orignode(struct tipc_msg *m)
450 {
451         if (likely(msg_short(m)))
452                 return msg_prevnode(m);
453         return msg_word(m, 6);
454 }
455 
456 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
457 {
458         msg_set_word(m, 6, a);
459 }
460 
461 static inline u32 msg_destnode(struct tipc_msg *m)
462 {
463         return msg_word(m, 7);
464 }
465 
466 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
467 {
468         msg_set_word(m, 7, a);
469 }
470 
471 static inline u32 msg_nametype(struct tipc_msg *m)
472 {
473         return msg_word(m, 8);
474 }
475 
476 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
477 {
478         msg_set_word(m, 8, n);
479 }
480 
481 static inline u32 msg_nameinst(struct tipc_msg *m)
482 {
483         return msg_word(m, 9);
484 }
485 
486 static inline u32 msg_namelower(struct tipc_msg *m)
487 {
488         return msg_nameinst(m);
489 }
490 
491 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
492 {
493         msg_set_word(m, 9, n);
494 }
495 
496 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
497 {
498         msg_set_namelower(m, n);
499 }
500 
501 static inline u32 msg_nameupper(struct tipc_msg *m)
502 {
503         return msg_word(m, 10);
504 }
505 
506 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
507 {
508         msg_set_word(m, 10, n);
509 }
510 
511 /*
512  * Constants and routines used to read and write TIPC internal message headers
513  */
514 
515 /*
516  *  Connection management protocol message types
517  */
518 #define CONN_PROBE        0
519 #define CONN_PROBE_REPLY  1
520 #define CONN_ACK          2
521 
522 /*
523  * Name distributor message types
524  */
525 #define PUBLICATION       0
526 #define WITHDRAWAL        1
527 
528 /*
529  * Segmentation message types
530  */
531 #define FIRST_FRAGMENT          0
532 #define FRAGMENT                1
533 #define LAST_FRAGMENT           2
534 
535 /*
536  * Link management protocol message types
537  */
538 #define STATE_MSG               0
539 #define RESET_MSG               1
540 #define ACTIVATE_MSG            2
541 
542 /*
543  * Changeover tunnel message types
544  */
545 #define SYNCH_MSG               0
546 #define FAILOVER_MSG            1
547 
548 /*
549  * Config protocol message types
550  */
551 #define DSC_REQ_MSG             0
552 #define DSC_RESP_MSG            1
553 #define DSC_TRIAL_MSG           2
554 #define DSC_TRIAL_FAIL_MSG      3
555 
556 /*
557  * Group protocol message types
558  */
559 #define GRP_JOIN_MSG         0
560 #define GRP_LEAVE_MSG        1
561 #define GRP_ADV_MSG          2
562 #define GRP_ACK_MSG          3
563 #define GRP_RECLAIM_MSG      4
564 #define GRP_REMIT_MSG        5
565 
566 /*
567  * Word 1
568  */
569 static inline u32 msg_seq_gap(struct tipc_msg *m)
570 {
571         return msg_bits(m, 1, 16, 0x1fff);
572 }
573 
574 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
575 {
576         msg_set_bits(m, 1, 16, 0x1fff, n);
577 }
578 
579 static inline u32 msg_node_sig(struct tipc_msg *m)
580 {
581         return msg_bits(m, 1, 0, 0xffff);
582 }
583 
584 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
585 {
586         msg_set_bits(m, 1, 0, 0xffff, n);
587 }
588 
589 static inline u32 msg_node_capabilities(struct tipc_msg *m)
590 {
591         return msg_bits(m, 1, 15, 0x1fff);
592 }
593 
594 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
595 {
596         msg_set_bits(m, 1, 15, 0x1fff, n);
597 }
598 
599 /*
600  * Word 2
601  */
602 static inline u32 msg_dest_domain(struct tipc_msg *m)
603 {
604         return msg_word(m, 2);
605 }
606 
607 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
608 {
609         msg_set_word(m, 2, n);
610 }
611 
612 static inline u32 msg_bcgap_after(struct tipc_msg *m)
613 {
614         return msg_bits(m, 2, 16, 0xffff);
615 }
616 
617 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
618 {
619         msg_set_bits(m, 2, 16, 0xffff, n);
620 }
621 
622 static inline u32 msg_bcgap_to(struct tipc_msg *m)
623 {
624         return msg_bits(m, 2, 0, 0xffff);
625 }
626 
627 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
628 {
629         msg_set_bits(m, 2, 0, 0xffff, n);
630 }
631 
632 /*
633  * Word 4
634  */
635 static inline u32 msg_last_bcast(struct tipc_msg *m)
636 {
637         return msg_bits(m, 4, 16, 0xffff);
638 }
639 
640 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
641 {
642         return msg_last_bcast(m) + 1;
643 }
644 
645 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
646 {
647         msg_set_bits(m, 4, 16, 0xffff, n);
648 }
649 
650 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
651 {
652         msg_set_bits(m, 4, 16, 0xffff, n);
653 }
654 
655 
656 static inline u16 msg_next_sent(struct tipc_msg *m)
657 {
658         return msg_bits(m, 4, 0, 0xffff);
659 }
660 
661 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
662 {
663         msg_set_bits(m, 4, 0, 0xffff, n);
664 }
665 
666 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
667 {
668         msg_set_bits(m, 4, 0, 0xffff, n);
669 }
670 
671 static inline u32 msg_bc_netid(struct tipc_msg *m)
672 {
673         return msg_word(m, 4);
674 }
675 
676 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
677 {
678         msg_set_word(m, 4, id);
679 }
680 
681 static inline u32 msg_link_selector(struct tipc_msg *m)
682 {
683         if (msg_user(m) == MSG_FRAGMENTER)
684                 m = (void *)msg_data(m);
685         return msg_bits(m, 4, 0, 1);
686 }
687 
688 /*
689  * Word 5
690  */
691 static inline u16 msg_session(struct tipc_msg *m)
692 {
693         return msg_bits(m, 5, 16, 0xffff);
694 }
695 
696 static inline void msg_set_session(struct tipc_msg *m, u16 n)
697 {
698         msg_set_bits(m, 5, 16, 0xffff, n);
699 }
700 
701 static inline u32 msg_probe(struct tipc_msg *m)
702 {
703         return msg_bits(m, 5, 0, 1);
704 }
705 
706 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
707 {
708         msg_set_bits(m, 5, 0, 1, val);
709 }
710 
711 static inline char msg_net_plane(struct tipc_msg *m)
712 {
713         return msg_bits(m, 5, 1, 7) + 'A';
714 }
715 
716 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
717 {
718         msg_set_bits(m, 5, 1, 7, (n - 'A'));
719 }
720 
721 static inline u32 msg_linkprio(struct tipc_msg *m)
722 {
723         return msg_bits(m, 5, 4, 0x1f);
724 }
725 
726 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
727 {
728         msg_set_bits(m, 5, 4, 0x1f, n);
729 }
730 
731 static inline u32 msg_bearer_id(struct tipc_msg *m)
732 {
733         return msg_bits(m, 5, 9, 0x7);
734 }
735 
736 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
737 {
738         msg_set_bits(m, 5, 9, 0x7, n);
739 }
740 
741 static inline u32 msg_redundant_link(struct tipc_msg *m)
742 {
743         return msg_bits(m, 5, 12, 0x1);
744 }
745 
746 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
747 {
748         msg_set_bits(m, 5, 12, 0x1, r);
749 }
750 
751 static inline u32 msg_peer_stopping(struct tipc_msg *m)
752 {
753         return msg_bits(m, 5, 13, 0x1);
754 }
755 
756 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
757 {
758         msg_set_bits(m, 5, 13, 0x1, s);
759 }
760 
761 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
762 {
763         switch (msg_user(m)) {
764         case BCAST_PROTOCOL:
765         case NAME_DISTRIBUTOR:
766         case LINK_PROTOCOL:
767                 return msg_bits(m, 5, 14, 0x1);
768         default:
769                 return false;
770         }
771 }
772 
773 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
774 {
775         msg_set_bits(m, 5, 14, 0x1, invalid);
776 }
777 
778 static inline char *msg_media_addr(struct tipc_msg *m)
779 {
780         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
781 }
782 
783 static inline u32 msg_bc_gap(struct tipc_msg *m)
784 {
785         return msg_bits(m, 8, 0, 0x3ff);
786 }
787 
788 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
789 {
790         msg_set_bits(m, 8, 0, 0x3ff, n);
791 }
792 
793 /*
794  * Word 9
795  */
796 static inline u16 msg_msgcnt(struct tipc_msg *m)
797 {
798         return msg_bits(m, 9, 16, 0xffff);
799 }
800 
801 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
802 {
803         msg_set_bits(m, 9, 16, 0xffff, n);
804 }
805 
806 static inline u32 msg_conn_ack(struct tipc_msg *m)
807 {
808         return msg_bits(m, 9, 16, 0xffff);
809 }
810 
811 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
812 {
813         msg_set_bits(m, 9, 16, 0xffff, n);
814 }
815 
816 static inline u16 msg_adv_win(struct tipc_msg *m)
817 {
818         return msg_bits(m, 9, 0, 0xffff);
819 }
820 
821 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
822 {
823         msg_set_bits(m, 9, 0, 0xffff, n);
824 }
825 
826 static inline u32 msg_max_pkt(struct tipc_msg *m)
827 {
828         return msg_bits(m, 9, 16, 0xffff) * 4;
829 }
830 
831 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
832 {
833         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
834 }
835 
836 static inline u32 msg_link_tolerance(struct tipc_msg *m)
837 {
838         return msg_bits(m, 9, 0, 0xffff);
839 }
840 
841 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
842 {
843         msg_set_bits(m, 9, 0, 0xffff, n);
844 }
845 
846 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
847 {
848         return msg_bits(m, 9, 16, 0xffff);
849 }
850 
851 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
852 {
853         msg_set_bits(m, 9, 16, 0xffff, n);
854 }
855 
856 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
857 {
858         return msg_bits(m, 9, 16, 0xffff);
859 }
860 
861 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
862 {
863         msg_set_bits(m, 9, 16, 0xffff, n);
864 }
865 
866 static inline u16 msg_grp_remitted(struct tipc_msg *m)
867 {
868         return msg_bits(m, 9, 16, 0xffff);
869 }
870 
871 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
872 {
873         msg_set_bits(m, 9, 16, 0xffff, n);
874 }
875 
876 /* Word 10
877  */
878 static inline u16 msg_grp_evt(struct tipc_msg *m)
879 {
880         return msg_bits(m, 10, 0, 0x3);
881 }
882 
883 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
884 {
885         msg_set_bits(m, 10, 0, 0x3, n);
886 }
887 
888 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
889 {
890         return msg_bits(m, 10, 0, 0x1);
891 }
892 
893 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
894 {
895         msg_set_bits(m, 10, 0, 0x1, n);
896 }
897 
898 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
899 {
900         return msg_bits(m, 10, 16, 0xffff);
901 }
902 
903 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
904 {
905         msg_set_bits(m, 10, 16, 0xffff, n);
906 }
907 
908 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
909 {
910         if (likely(msg_user(m) != LINK_PROTOCOL))
911                 return true;
912         if (msg_type(m) == STATE_MSG)
913                 return true;
914         return false;
915 }
916 
917 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
918 {
919         if (msg_peer_link_is_up(m))
920                 return true;
921         return msg_redundant_link(m);
922 }
923 
924 static inline bool msg_is_reset(struct tipc_msg *hdr)
925 {
926         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
927 }
928 
929 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
930 {
931         return msg_word(m, 14);
932 }
933 
934 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
935 {
936         msg_set_word(m, 14, n);
937 }
938 
939 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
940 {
941         memcpy(msg_data(hdr), id, 16);
942 }
943 
944 static inline u8 *msg_node_id(struct tipc_msg *hdr)
945 {
946         return (u8 *)msg_data(hdr);
947 }
948 
949 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
950 bool tipc_msg_validate(struct sk_buff **_skb);
951 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
952 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
953                      struct sk_buff_head *xmitq);
954 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
955                    u32 hsize, u32 destnode);
956 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
957                                 uint data_sz, u32 dnode, u32 onode,
958                                 u32 dport, u32 oport, int errcode);
959 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
960 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
961 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
962                           u32 mtu, u32 dnode);
963 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
964 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
965                    int offset, int dsz, int mtu, struct sk_buff_head *list);
966 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
967 bool tipc_msg_assemble(struct sk_buff_head *list);
968 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
969 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
970                         struct sk_buff_head *cpy);
971 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
972                              struct sk_buff *skb);
973 
974 static inline u16 buf_seqno(struct sk_buff *skb)
975 {
976         return msg_seqno(buf_msg(skb));
977 }
978 
979 static inline int buf_roundup_len(struct sk_buff *skb)
980 {
981         return (skb->len / 1024 + 1) * 1024;
982 }
983 
984 /* tipc_skb_peek(): peek and reserve first buffer in list
985  * @list: list to be peeked in
986  * Returns pointer to first buffer in list, if any
987  */
988 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
989                                             spinlock_t *lock)
990 {
991         struct sk_buff *skb;
992 
993         spin_lock_bh(lock);
994         skb = skb_peek(list);
995         if (skb)
996                 skb_get(skb);
997         spin_unlock_bh(lock);
998         return skb;
999 }
1000 
1001 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1002  *                       up to and including 'filter'.
1003  * Note: ignoring previously tried destinations minimizes the risk of
1004  *       contention on the socket lock
1005  * @list: list to be peeked in
1006  * @filter: last destination to be ignored from search
1007  * Returns a destination port number, of applicable.
1008  */
1009 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1010 {
1011         struct sk_buff *skb;
1012         u32 dport = 0;
1013         bool ignore = true;
1014 
1015         spin_lock_bh(&list->lock);
1016         skb_queue_walk(list, skb) {
1017                 dport = msg_destport(buf_msg(skb));
1018                 if (!filter || skb_queue_is_last(list, skb))
1019                         break;
1020                 if (dport == filter)
1021                         ignore = false;
1022                 else if (!ignore)
1023                         break;
1024         }
1025         spin_unlock_bh(&list->lock);
1026         return dport;
1027 }
1028 
1029 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1030  * @list: list to be unlinked from
1031  * @dport: selection criteria for buffer to unlink
1032  */
1033 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1034                                                u32 dport)
1035 {
1036         struct sk_buff *_skb, *tmp, *skb = NULL;
1037 
1038         spin_lock_bh(&list->lock);
1039         skb_queue_walk_safe(list, _skb, tmp) {
1040                 if (msg_destport(buf_msg(_skb)) == dport) {
1041                         __skb_unlink(_skb, list);
1042                         skb = _skb;
1043                         break;
1044                 }
1045         }
1046         spin_unlock_bh(&list->lock);
1047         return skb;
1048 }
1049 
1050 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1051  * @list: the new list to append. Not lock protected
1052  * @head: target list. Lock protected.
1053  */
1054 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1055                                               struct sk_buff_head *head)
1056 {
1057         spin_lock_bh(&head->lock);
1058         skb_queue_splice_tail(list, head);
1059         spin_unlock_bh(&head->lock);
1060 }
1061 
1062 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1063  * @list: the new list to add. Lock protected. Will be reinitialized
1064  * @head: target list. Lock protected.
1065  */
1066 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1067                                                    struct sk_buff_head *head)
1068 {
1069         struct sk_buff_head tmp;
1070 
1071         __skb_queue_head_init(&tmp);
1072 
1073         spin_lock_bh(&list->lock);
1074         skb_queue_splice_tail_init(list, &tmp);
1075         spin_unlock_bh(&list->lock);
1076         tipc_skb_queue_splice_tail(&tmp, head);
1077 }
1078 
1079 #endif
1080 

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