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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ 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-3.16.76 ] ~ [ 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-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * net/tipc/msg.h: Include file for TIPC message header routines
  3  *
  4  * Copyright (c) 2000-2007, 2014-2015 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 
 42 /*
 43  * Constants and routines used to read and write TIPC payload message headers
 44  *
 45  * Note: Some items are also used with TIPC internal message headers
 46  */
 47 #define TIPC_VERSION              2
 48 struct plist;
 49 
 50 /*
 51  * Payload message users are defined in TIPC's public API:
 52  * - TIPC_LOW_IMPORTANCE
 53  * - TIPC_MEDIUM_IMPORTANCE
 54  * - TIPC_HIGH_IMPORTANCE
 55  * - TIPC_CRITICAL_IMPORTANCE
 56  */
 57 #define TIPC_SYSTEM_IMPORTANCE  4
 58 
 59 
 60 /*
 61  * Payload message types
 62  */
 63 #define TIPC_CONN_MSG           0
 64 #define TIPC_MCAST_MSG          1
 65 #define TIPC_NAMED_MSG          2
 66 #define TIPC_DIRECT_MSG         3
 67 
 68 /*
 69  * Internal message users
 70  */
 71 #define  BCAST_PROTOCOL       5
 72 #define  MSG_BUNDLER          6
 73 #define  LINK_PROTOCOL        7
 74 #define  CONN_MANAGER         8
 75 #define  TUNNEL_PROTOCOL      10
 76 #define  NAME_DISTRIBUTOR     11
 77 #define  MSG_FRAGMENTER       12
 78 #define  LINK_CONFIG          13
 79 #define  SOCK_WAKEUP          14       /* pseudo user */
 80 
 81 /*
 82  * Message header sizes
 83  */
 84 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
 85 #define BASIC_H_SIZE              32    /* Basic payload message */
 86 #define NAMED_H_SIZE              40    /* Named payload message */
 87 #define MCAST_H_SIZE              44    /* Multicast payload message */
 88 #define INT_H_SIZE                40    /* Internal messages */
 89 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
 90 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
 91 
 92 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
 93 
 94 #define TIPC_MEDIA_INFO_OFFSET  5
 95 
 96 /**
 97  * TIPC message buffer code
 98  *
 99  * TIPC message buffer headroom reserves space for the worst-case
100  * link-level device header (in case the message is sent off-node).
101  *
102  * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
103  *       are word aligned for quicker access
104  */
105 #define BUF_HEADROOM (LL_MAX_HEADER + 48)
106 
107 struct tipc_skb_cb {
108         void *handle;
109         struct sk_buff *tail;
110         bool validated;
111         bool wakeup_pending;
112         bool bundling;
113         u16 chain_sz;
114         u16 chain_imp;
115 };
116 
117 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
118 
119 struct tipc_msg {
120         __be32 hdr[15];
121 };
122 
123 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
124 {
125         return (struct tipc_msg *)skb->data;
126 }
127 
128 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
129 {
130         return ntohl(m->hdr[pos]);
131 }
132 
133 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
134 {
135         m->hdr[w] = htonl(val);
136 }
137 
138 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
139 {
140         return (msg_word(m, w) >> pos) & mask;
141 }
142 
143 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
144                                 u32 pos, u32 mask, u32 val)
145 {
146         val = (val & mask) << pos;
147         mask = mask << pos;
148         m->hdr[w] &= ~htonl(mask);
149         m->hdr[w] |= htonl(val);
150 }
151 
152 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
153 {
154         u32 temp = msg->hdr[a];
155 
156         msg->hdr[a] = msg->hdr[b];
157         msg->hdr[b] = temp;
158 }
159 
160 /*
161  * Word 0
162  */
163 static inline u32 msg_version(struct tipc_msg *m)
164 {
165         return msg_bits(m, 0, 29, 7);
166 }
167 
168 static inline void msg_set_version(struct tipc_msg *m)
169 {
170         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
171 }
172 
173 static inline u32 msg_user(struct tipc_msg *m)
174 {
175         return msg_bits(m, 0, 25, 0xf);
176 }
177 
178 static inline u32 msg_isdata(struct tipc_msg *m)
179 {
180         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
181 }
182 
183 static inline void msg_set_user(struct tipc_msg *m, u32 n)
184 {
185         msg_set_bits(m, 0, 25, 0xf, n);
186 }
187 
188 static inline u32 msg_hdr_sz(struct tipc_msg *m)
189 {
190         return msg_bits(m, 0, 21, 0xf) << 2;
191 }
192 
193 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
194 {
195         msg_set_bits(m, 0, 21, 0xf, n>>2);
196 }
197 
198 static inline u32 msg_size(struct tipc_msg *m)
199 {
200         return msg_bits(m, 0, 0, 0x1ffff);
201 }
202 
203 static inline u32 msg_data_sz(struct tipc_msg *m)
204 {
205         return msg_size(m) - msg_hdr_sz(m);
206 }
207 
208 static inline int msg_non_seq(struct tipc_msg *m)
209 {
210         return msg_bits(m, 0, 20, 1);
211 }
212 
213 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
214 {
215         msg_set_bits(m, 0, 20, 1, n);
216 }
217 
218 static inline int msg_dest_droppable(struct tipc_msg *m)
219 {
220         return msg_bits(m, 0, 19, 1);
221 }
222 
223 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
224 {
225         msg_set_bits(m, 0, 19, 1, d);
226 }
227 
228 static inline int msg_src_droppable(struct tipc_msg *m)
229 {
230         return msg_bits(m, 0, 18, 1);
231 }
232 
233 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
234 {
235         msg_set_bits(m, 0, 18, 1, d);
236 }
237 
238 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
239 {
240         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
241 }
242 
243 static inline unchar *msg_data(struct tipc_msg *m)
244 {
245         return ((unchar *)m) + msg_hdr_sz(m);
246 }
247 
248 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
249 {
250         return (struct tipc_msg *)msg_data(m);
251 }
252 
253 /*
254  * Word 1
255  */
256 static inline u32 msg_type(struct tipc_msg *m)
257 {
258         return msg_bits(m, 1, 29, 0x7);
259 }
260 
261 static inline void msg_set_type(struct tipc_msg *m, u32 n)
262 {
263         msg_set_bits(m, 1, 29, 0x7, n);
264 }
265 
266 static inline u32 msg_named(struct tipc_msg *m)
267 {
268         return msg_type(m) == TIPC_NAMED_MSG;
269 }
270 
271 static inline u32 msg_mcast(struct tipc_msg *m)
272 {
273         return msg_type(m) == TIPC_MCAST_MSG;
274 }
275 
276 static inline u32 msg_connected(struct tipc_msg *m)
277 {
278         return msg_type(m) == TIPC_CONN_MSG;
279 }
280 
281 static inline u32 msg_errcode(struct tipc_msg *m)
282 {
283         return msg_bits(m, 1, 25, 0xf);
284 }
285 
286 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
287 {
288         msg_set_bits(m, 1, 25, 0xf, err);
289 }
290 
291 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
292 {
293         return msg_bits(m, 1, 21, 0xf);
294 }
295 
296 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
297 {
298         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
299 }
300 
301 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
302 {
303         msg_set_bits(m, 1, 21, 0xf, 0);
304 }
305 
306 static inline u32 msg_lookup_scope(struct tipc_msg *m)
307 {
308         return msg_bits(m, 1, 19, 0x3);
309 }
310 
311 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
312 {
313         msg_set_bits(m, 1, 19, 0x3, n);
314 }
315 
316 static inline u32 msg_bcast_ack(struct tipc_msg *m)
317 {
318         return msg_bits(m, 1, 0, 0xffff);
319 }
320 
321 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
322 {
323         msg_set_bits(m, 1, 0, 0xffff, n);
324 }
325 
326 
327 /*
328  * Word 2
329  */
330 static inline u32 msg_ack(struct tipc_msg *m)
331 {
332         return msg_bits(m, 2, 16, 0xffff);
333 }
334 
335 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
336 {
337         msg_set_bits(m, 2, 16, 0xffff, n);
338 }
339 
340 static inline u32 msg_seqno(struct tipc_msg *m)
341 {
342         return msg_bits(m, 2, 0, 0xffff);
343 }
344 
345 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
346 {
347         msg_set_bits(m, 2, 0, 0xffff, n);
348 }
349 
350 /*
351  * Words 3-10
352  */
353 static inline u32 msg_importance(struct tipc_msg *m)
354 {
355         if (unlikely(msg_user(m) == MSG_FRAGMENTER))
356                 return msg_bits(m, 9, 0, 0x7);
357         if (likely(msg_isdata(m) && !msg_errcode(m)))
358                 return msg_user(m);
359         return TIPC_SYSTEM_IMPORTANCE;
360 }
361 
362 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
363 {
364         if (unlikely(msg_user(m) == MSG_FRAGMENTER))
365                 msg_set_bits(m, 9, 0, 0x7, i);
366         else if (likely(i < TIPC_SYSTEM_IMPORTANCE))
367                 msg_set_user(m, i);
368         else
369                 pr_warn("Trying to set illegal importance in message\n");
370 }
371 
372 static inline u32 msg_prevnode(struct tipc_msg *m)
373 {
374         return msg_word(m, 3);
375 }
376 
377 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
378 {
379         msg_set_word(m, 3, a);
380 }
381 
382 static inline u32 msg_origport(struct tipc_msg *m)
383 {
384         if (msg_user(m) == MSG_FRAGMENTER)
385                 m = msg_get_wrapped(m);
386         return msg_word(m, 4);
387 }
388 
389 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
390 {
391         msg_set_word(m, 4, p);
392 }
393 
394 static inline u32 msg_destport(struct tipc_msg *m)
395 {
396         return msg_word(m, 5);
397 }
398 
399 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
400 {
401         msg_set_word(m, 5, p);
402 }
403 
404 static inline u32 msg_mc_netid(struct tipc_msg *m)
405 {
406         return msg_word(m, 5);
407 }
408 
409 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
410 {
411         msg_set_word(m, 5, p);
412 }
413 
414 static inline int msg_short(struct tipc_msg *m)
415 {
416         return msg_hdr_sz(m) == SHORT_H_SIZE;
417 }
418 
419 static inline u32 msg_orignode(struct tipc_msg *m)
420 {
421         if (likely(msg_short(m)))
422                 return msg_prevnode(m);
423         return msg_word(m, 6);
424 }
425 
426 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
427 {
428         msg_set_word(m, 6, a);
429 }
430 
431 static inline u32 msg_destnode(struct tipc_msg *m)
432 {
433         return msg_word(m, 7);
434 }
435 
436 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
437 {
438         msg_set_word(m, 7, a);
439 }
440 
441 static inline u32 msg_nametype(struct tipc_msg *m)
442 {
443         return msg_word(m, 8);
444 }
445 
446 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
447 {
448         msg_set_word(m, 8, n);
449 }
450 
451 static inline u32 msg_nameinst(struct tipc_msg *m)
452 {
453         return msg_word(m, 9);
454 }
455 
456 static inline u32 msg_namelower(struct tipc_msg *m)
457 {
458         return msg_nameinst(m);
459 }
460 
461 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
462 {
463         msg_set_word(m, 9, n);
464 }
465 
466 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
467 {
468         msg_set_namelower(m, n);
469 }
470 
471 static inline u32 msg_nameupper(struct tipc_msg *m)
472 {
473         return msg_word(m, 10);
474 }
475 
476 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
477 {
478         msg_set_word(m, 10, n);
479 }
480 
481 /*
482  * Constants and routines used to read and write TIPC internal message headers
483  */
484 
485 /*
486  *  Connection management protocol message types
487  */
488 #define CONN_PROBE        0
489 #define CONN_PROBE_REPLY  1
490 #define CONN_ACK          2
491 
492 /*
493  * Name distributor message types
494  */
495 #define PUBLICATION       0
496 #define WITHDRAWAL        1
497 
498 /*
499  * Segmentation message types
500  */
501 #define FIRST_FRAGMENT          0
502 #define FRAGMENT                1
503 #define LAST_FRAGMENT           2
504 
505 /*
506  * Link management protocol message types
507  */
508 #define STATE_MSG               0
509 #define RESET_MSG               1
510 #define ACTIVATE_MSG            2
511 
512 /*
513  * Changeover tunnel message types
514  */
515 #define SYNCH_MSG               0
516 #define FAILOVER_MSG            1
517 
518 /*
519  * Config protocol message types
520  */
521 #define DSC_REQ_MSG             0
522 #define DSC_RESP_MSG            1
523 
524 /*
525  * Word 1
526  */
527 static inline u32 msg_seq_gap(struct tipc_msg *m)
528 {
529         return msg_bits(m, 1, 16, 0x1fff);
530 }
531 
532 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
533 {
534         msg_set_bits(m, 1, 16, 0x1fff, n);
535 }
536 
537 static inline u32 msg_node_sig(struct tipc_msg *m)
538 {
539         return msg_bits(m, 1, 0, 0xffff);
540 }
541 
542 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
543 {
544         msg_set_bits(m, 1, 0, 0xffff, n);
545 }
546 
547 static inline u32 msg_node_capabilities(struct tipc_msg *m)
548 {
549         return msg_bits(m, 1, 15, 0x1fff);
550 }
551 
552 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
553 {
554         msg_set_bits(m, 1, 15, 0x1fff, n);
555 }
556 
557 static inline bool msg_dup(struct tipc_msg *m)
558 {
559         if (likely(msg_user(m) != TUNNEL_PROTOCOL))
560                 return false;
561         if (msg_type(m) != SYNCH_MSG)
562                 return false;
563         return true;
564 }
565 
566 /*
567  * Word 2
568  */
569 static inline u32 msg_dest_domain(struct tipc_msg *m)
570 {
571         return msg_word(m, 2);
572 }
573 
574 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
575 {
576         msg_set_word(m, 2, n);
577 }
578 
579 static inline u32 msg_bcgap_after(struct tipc_msg *m)
580 {
581         return msg_bits(m, 2, 16, 0xffff);
582 }
583 
584 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
585 {
586         msg_set_bits(m, 2, 16, 0xffff, n);
587 }
588 
589 static inline u32 msg_bcgap_to(struct tipc_msg *m)
590 {
591         return msg_bits(m, 2, 0, 0xffff);
592 }
593 
594 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
595 {
596         msg_set_bits(m, 2, 0, 0xffff, n);
597 }
598 
599 
600 /*
601  * Word 4
602  */
603 static inline u32 msg_last_bcast(struct tipc_msg *m)
604 {
605         return msg_bits(m, 4, 16, 0xffff);
606 }
607 
608 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
609 {
610         msg_set_bits(m, 4, 16, 0xffff, n);
611 }
612 
613 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
614 {
615         msg_set_bits(m, 4, 16, 0xffff, n);
616 }
617 
618 
619 static inline u32 msg_next_sent(struct tipc_msg *m)
620 {
621         return msg_bits(m, 4, 0, 0xffff);
622 }
623 
624 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
625 {
626         msg_set_bits(m, 4, 0, 0xffff, n);
627 }
628 
629 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
630 {
631         msg_set_bits(m, 4, 0, 0xffff, n);
632 }
633 
634 static inline u32 msg_bc_netid(struct tipc_msg *m)
635 {
636         return msg_word(m, 4);
637 }
638 
639 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
640 {
641         msg_set_word(m, 4, id);
642 }
643 
644 static inline u32 msg_link_selector(struct tipc_msg *m)
645 {
646         return msg_bits(m, 4, 0, 1);
647 }
648 
649 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
650 {
651         msg_set_bits(m, 4, 0, 1, n);
652 }
653 
654 /*
655  * Word 5
656  */
657 static inline u32 msg_session(struct tipc_msg *m)
658 {
659         return msg_bits(m, 5, 16, 0xffff);
660 }
661 
662 static inline void msg_set_session(struct tipc_msg *m, u32 n)
663 {
664         msg_set_bits(m, 5, 16, 0xffff, n);
665 }
666 
667 static inline u32 msg_probe(struct tipc_msg *m)
668 {
669         return msg_bits(m, 5, 0, 1);
670 }
671 
672 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
673 {
674         msg_set_bits(m, 5, 0, 1, val);
675 }
676 
677 static inline char msg_net_plane(struct tipc_msg *m)
678 {
679         return msg_bits(m, 5, 1, 7) + 'A';
680 }
681 
682 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
683 {
684         msg_set_bits(m, 5, 1, 7, (n - 'A'));
685 }
686 
687 static inline u32 msg_linkprio(struct tipc_msg *m)
688 {
689         return msg_bits(m, 5, 4, 0x1f);
690 }
691 
692 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
693 {
694         msg_set_bits(m, 5, 4, 0x1f, n);
695 }
696 
697 static inline u32 msg_bearer_id(struct tipc_msg *m)
698 {
699         return msg_bits(m, 5, 9, 0x7);
700 }
701 
702 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
703 {
704         msg_set_bits(m, 5, 9, 0x7, n);
705 }
706 
707 static inline u32 msg_redundant_link(struct tipc_msg *m)
708 {
709         return msg_bits(m, 5, 12, 0x1);
710 }
711 
712 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
713 {
714         msg_set_bits(m, 5, 12, 0x1, r);
715 }
716 
717 static inline char *msg_media_addr(struct tipc_msg *m)
718 {
719         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
720 }
721 
722 /*
723  * Word 9
724  */
725 static inline u32 msg_msgcnt(struct tipc_msg *m)
726 {
727         return msg_bits(m, 9, 16, 0xffff);
728 }
729 
730 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
731 {
732         msg_set_bits(m, 9, 16, 0xffff, n);
733 }
734 
735 static inline u32 msg_bcast_tag(struct tipc_msg *m)
736 {
737         return msg_bits(m, 9, 16, 0xffff);
738 }
739 
740 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
741 {
742         msg_set_bits(m, 9, 16, 0xffff, n);
743 }
744 
745 static inline u32 msg_max_pkt(struct tipc_msg *m)
746 {
747         return msg_bits(m, 9, 16, 0xffff) * 4;
748 }
749 
750 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
751 {
752         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
753 }
754 
755 static inline u32 msg_link_tolerance(struct tipc_msg *m)
756 {
757         return msg_bits(m, 9, 0, 0xffff);
758 }
759 
760 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
761 {
762         msg_set_bits(m, 9, 0, 0xffff, n);
763 }
764 
765 struct sk_buff *tipc_buf_acquire(u32 size);
766 bool tipc_msg_validate(struct sk_buff *skb);
767 bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
768                       int err);
769 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
770                    u32 hsize, u32 destnode);
771 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
772                                 uint data_sz, u32 dnode, u32 onode,
773                                 u32 dport, u32 oport, int errcode);
774 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
775 bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu);
776 
777 bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode);
778 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
779 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
780                    int offset, int dsz, int mtu, struct sk_buff_head *list);
781 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, u32 *dnode,
782                           int *err);
783 struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list);
784 
785 /* tipc_skb_peek(): peek and reserve first buffer in list
786  * @list: list to be peeked in
787  * Returns pointer to first buffer in list, if any
788  */
789 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
790                                             spinlock_t *lock)
791 {
792         struct sk_buff *skb;
793 
794         spin_lock_bh(lock);
795         skb = skb_peek(list);
796         if (skb)
797                 skb_get(skb);
798         spin_unlock_bh(lock);
799         return skb;
800 }
801 
802 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
803  *                       up to and including 'filter'.
804  * Note: ignoring previously tried destinations minimizes the risk of
805  *       contention on the socket lock
806  * @list: list to be peeked in
807  * @filter: last destination to be ignored from search
808  * Returns a destination port number, of applicable.
809  */
810 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
811 {
812         struct sk_buff *skb;
813         u32 dport = 0;
814         bool ignore = true;
815 
816         spin_lock_bh(&list->lock);
817         skb_queue_walk(list, skb) {
818                 dport = msg_destport(buf_msg(skb));
819                 if (!filter || skb_queue_is_last(list, skb))
820                         break;
821                 if (dport == filter)
822                         ignore = false;
823                 else if (!ignore)
824                         break;
825         }
826         spin_unlock_bh(&list->lock);
827         return dport;
828 }
829 
830 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
831  * @list: list to be unlinked from
832  * @dport: selection criteria for buffer to unlink
833  */
834 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
835                                                u32 dport)
836 {
837         struct sk_buff *_skb, *tmp, *skb = NULL;
838 
839         spin_lock_bh(&list->lock);
840         skb_queue_walk_safe(list, _skb, tmp) {
841                 if (msg_destport(buf_msg(_skb)) == dport) {
842                         __skb_unlink(_skb, list);
843                         skb = _skb;
844                         break;
845                 }
846         }
847         spin_unlock_bh(&list->lock);
848         return skb;
849 }
850 
851 /* tipc_skb_queue_tail(): add buffer to tail of list;
852  * @list: list to be appended to
853  * @skb: buffer to append. Always appended
854  * @dport: the destination port of the buffer
855  * returns true if dport differs from previous destination
856  */
857 static inline bool tipc_skb_queue_tail(struct sk_buff_head *list,
858                                        struct sk_buff *skb, u32 dport)
859 {
860         struct sk_buff *_skb = NULL;
861         bool rv = false;
862 
863         spin_lock_bh(&list->lock);
864         _skb = skb_peek_tail(list);
865         if (!_skb || (msg_destport(buf_msg(_skb)) != dport) ||
866             (skb_queue_len(list) > 32))
867                 rv = true;
868         __skb_queue_tail(list, skb);
869         spin_unlock_bh(&list->lock);
870         return rv;
871 }
872 
873 #endif
874 

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