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msg.h
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1 /*
2  * net/tipc/msg.h: Include file for TIPC message header routines
3  *
4  * Copyright (c) 2000-2007, 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 "bearer.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 
49 /*
50  * Payload message users are defined in TIPC's public API:
51  * - TIPC_LOW_IMPORTANCE
52  * - TIPC_MEDIUM_IMPORTANCE
53  * - TIPC_HIGH_IMPORTANCE
54  * - TIPC_CRITICAL_IMPORTANCE
55  */
56 
57 /*
58  * Payload message types
59  */
60 #define TIPC_CONN_MSG 0
61 #define TIPC_MCAST_MSG 1
62 #define TIPC_NAMED_MSG 2
63 #define TIPC_DIRECT_MSG 3
64 
65 /*
66  * Message header sizes
67  */
68 #define SHORT_H_SIZE 24 /* In-cluster basic payload message */
69 #define BASIC_H_SIZE 32 /* Basic payload message */
70 #define NAMED_H_SIZE 40 /* Named payload message */
71 #define MCAST_H_SIZE 44 /* Multicast payload message */
72 #define INT_H_SIZE 40 /* Internal messages */
73 #define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
74 #define MAX_H_SIZE 60 /* Largest possible TIPC header size */
75 
76 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
77 
78 #define TIPC_MEDIA_ADDR_OFFSET 5
79 
80 
81 struct tipc_msg {
82  __be32 hdr[15];
83 };
84 
85 
86 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
87 {
88  return ntohl(m->hdr[pos]);
89 }
90 
91 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
92 {
93  m->hdr[w] = htonl(val);
94 }
95 
96 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
97 {
98  return (msg_word(m, w) >> pos) & mask;
99 }
100 
101 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
102  u32 pos, u32 mask, u32 val)
103 {
104  val = (val & mask) << pos;
105  mask = mask << pos;
106  m->hdr[w] &= ~htonl(mask);
107  m->hdr[w] |= htonl(val);
108 }
109 
110 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
111 {
112  u32 temp = msg->hdr[a];
113 
114  msg->hdr[a] = msg->hdr[b];
115  msg->hdr[b] = temp;
116 }
117 
118 /*
119  * Word 0
120  */
121 static inline u32 msg_version(struct tipc_msg *m)
122 {
123  return msg_bits(m, 0, 29, 7);
124 }
125 
126 static inline void msg_set_version(struct tipc_msg *m)
127 {
128  msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
129 }
130 
131 static inline u32 msg_user(struct tipc_msg *m)
132 {
133  return msg_bits(m, 0, 25, 0xf);
134 }
135 
136 static inline u32 msg_isdata(struct tipc_msg *m)
137 {
138  return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
139 }
140 
141 static inline void msg_set_user(struct tipc_msg *m, u32 n)
142 {
143  msg_set_bits(m, 0, 25, 0xf, n);
144 }
145 
146 static inline u32 msg_importance(struct tipc_msg *m)
147 {
148  return msg_bits(m, 0, 25, 0xf);
149 }
150 
151 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
152 {
153  msg_set_user(m, i);
154 }
155 
156 static inline u32 msg_hdr_sz(struct tipc_msg *m)
157 {
158  return msg_bits(m, 0, 21, 0xf) << 2;
159 }
160 
161 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
162 {
163  msg_set_bits(m, 0, 21, 0xf, n>>2);
164 }
165 
166 static inline u32 msg_size(struct tipc_msg *m)
167 {
168  return msg_bits(m, 0, 0, 0x1ffff);
169 }
170 
171 static inline u32 msg_data_sz(struct tipc_msg *m)
172 {
173  return msg_size(m) - msg_hdr_sz(m);
174 }
175 
176 static inline int msg_non_seq(struct tipc_msg *m)
177 {
178  return msg_bits(m, 0, 20, 1);
179 }
180 
181 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
182 {
183  msg_set_bits(m, 0, 20, 1, n);
184 }
185 
186 static inline int msg_dest_droppable(struct tipc_msg *m)
187 {
188  return msg_bits(m, 0, 19, 1);
189 }
190 
191 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
192 {
193  msg_set_bits(m, 0, 19, 1, d);
194 }
195 
196 static inline int msg_src_droppable(struct tipc_msg *m)
197 {
198  return msg_bits(m, 0, 18, 1);
199 }
200 
201 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
202 {
203  msg_set_bits(m, 0, 18, 1, d);
204 }
205 
206 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
207 {
208  m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
209 }
210 
211 
212 /*
213  * Word 1
214  */
215 static inline u32 msg_type(struct tipc_msg *m)
216 {
217  return msg_bits(m, 1, 29, 0x7);
218 }
219 
220 static inline void msg_set_type(struct tipc_msg *m, u32 n)
221 {
222  msg_set_bits(m, 1, 29, 0x7, n);
223 }
224 
225 static inline u32 msg_named(struct tipc_msg *m)
226 {
227  return msg_type(m) == TIPC_NAMED_MSG;
228 }
229 
230 static inline u32 msg_mcast(struct tipc_msg *m)
231 {
232  return msg_type(m) == TIPC_MCAST_MSG;
233 }
234 
235 static inline u32 msg_connected(struct tipc_msg *m)
236 {
237  return msg_type(m) == TIPC_CONN_MSG;
238 }
239 
240 static inline u32 msg_errcode(struct tipc_msg *m)
241 {
242  return msg_bits(m, 1, 25, 0xf);
243 }
244 
245 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
246 {
247  msg_set_bits(m, 1, 25, 0xf, err);
248 }
249 
250 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
251 {
252  return msg_bits(m, 1, 21, 0xf);
253 }
254 
255 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
256 {
257  msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
258 }
259 
260 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
261 {
262  msg_set_bits(m, 1, 21, 0xf, 0);
263 }
264 
265 static inline u32 msg_lookup_scope(struct tipc_msg *m)
266 {
267  return msg_bits(m, 1, 19, 0x3);
268 }
269 
270 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
271 {
272  msg_set_bits(m, 1, 19, 0x3, n);
273 }
274 
275 static inline u32 msg_bcast_ack(struct tipc_msg *m)
276 {
277  return msg_bits(m, 1, 0, 0xffff);
278 }
279 
280 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
281 {
282  msg_set_bits(m, 1, 0, 0xffff, n);
283 }
284 
285 
286 /*
287  * Word 2
288  */
289 static inline u32 msg_ack(struct tipc_msg *m)
290 {
291  return msg_bits(m, 2, 16, 0xffff);
292 }
293 
294 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
295 {
296  msg_set_bits(m, 2, 16, 0xffff, n);
297 }
298 
299 static inline u32 msg_seqno(struct tipc_msg *m)
300 {
301  return msg_bits(m, 2, 0, 0xffff);
302 }
303 
304 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
305 {
306  msg_set_bits(m, 2, 0, 0xffff, n);
307 }
308 
309 /*
310  * Words 3-10
311  */
312 static inline u32 msg_prevnode(struct tipc_msg *m)
313 {
314  return msg_word(m, 3);
315 }
316 
317 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
318 {
319  msg_set_word(m, 3, a);
320 }
321 
322 static inline u32 msg_origport(struct tipc_msg *m)
323 {
324  return msg_word(m, 4);
325 }
326 
327 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
328 {
329  msg_set_word(m, 4, p);
330 }
331 
332 static inline u32 msg_destport(struct tipc_msg *m)
333 {
334  return msg_word(m, 5);
335 }
336 
337 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
338 {
339  msg_set_word(m, 5, p);
340 }
341 
342 static inline u32 msg_mc_netid(struct tipc_msg *m)
343 {
344  return msg_word(m, 5);
345 }
346 
347 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
348 {
349  msg_set_word(m, 5, p);
350 }
351 
352 static inline int msg_short(struct tipc_msg *m)
353 {
354  return msg_hdr_sz(m) == SHORT_H_SIZE;
355 }
356 
357 static inline u32 msg_orignode(struct tipc_msg *m)
358 {
359  if (likely(msg_short(m)))
360  return msg_prevnode(m);
361  return msg_word(m, 6);
362 }
363 
364 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
365 {
366  msg_set_word(m, 6, a);
367 }
368 
369 static inline u32 msg_destnode(struct tipc_msg *m)
370 {
371  return msg_word(m, 7);
372 }
373 
374 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
375 {
376  msg_set_word(m, 7, a);
377 }
378 
379 static inline u32 msg_nametype(struct tipc_msg *m)
380 {
381  return msg_word(m, 8);
382 }
383 
384 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
385 {
386  msg_set_word(m, 8, n);
387 }
388 
389 static inline u32 msg_nameinst(struct tipc_msg *m)
390 {
391  return msg_word(m, 9);
392 }
393 
394 static inline u32 msg_namelower(struct tipc_msg *m)
395 {
396  return msg_nameinst(m);
397 }
398 
399 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
400 {
401  msg_set_word(m, 9, n);
402 }
403 
404 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
405 {
406  msg_set_namelower(m, n);
407 }
408 
409 static inline u32 msg_nameupper(struct tipc_msg *m)
410 {
411  return msg_word(m, 10);
412 }
413 
414 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
415 {
416  msg_set_word(m, 10, n);
417 }
418 
419 static inline unchar *msg_data(struct tipc_msg *m)
420 {
421  return ((unchar *)m) + msg_hdr_sz(m);
422 }
423 
424 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
425 {
426  return (struct tipc_msg *)msg_data(m);
427 }
428 
429 /*
430  * Constants and routines used to read and write TIPC internal message headers
431  */
432 
433 /*
434  * Internal message users
435  */
436 #define BCAST_PROTOCOL 5
437 #define MSG_BUNDLER 6
438 #define LINK_PROTOCOL 7
439 #define CONN_MANAGER 8
440 #define ROUTE_DISTRIBUTOR 9 /* obsoleted */
441 #define CHANGEOVER_PROTOCOL 10
442 #define NAME_DISTRIBUTOR 11
443 #define MSG_FRAGMENTER 12
444 #define LINK_CONFIG 13
445 
446 /*
447  * Connection management protocol message types
448  */
449 #define CONN_PROBE 0
450 #define CONN_PROBE_REPLY 1
451 #define CONN_ACK 2
452 
453 /*
454  * Name distributor message types
455  */
456 #define PUBLICATION 0
457 #define WITHDRAWAL 1
458 
459 /*
460  * Segmentation message types
461  */
462 #define FIRST_FRAGMENT 0
463 #define FRAGMENT 1
464 #define LAST_FRAGMENT 2
465 
466 /*
467  * Link management protocol message types
468  */
469 #define STATE_MSG 0
470 #define RESET_MSG 1
471 #define ACTIVATE_MSG 2
472 
473 /*
474  * Changeover tunnel message types
475  */
476 #define DUPLICATE_MSG 0
477 #define ORIGINAL_MSG 1
478 
479 /*
480  * Config protocol message types
481  */
482 #define DSC_REQ_MSG 0
483 #define DSC_RESP_MSG 1
484 
485 
486 /*
487  * Word 1
488  */
489 static inline u32 msg_seq_gap(struct tipc_msg *m)
490 {
491  return msg_bits(m, 1, 16, 0x1fff);
492 }
493 
494 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
495 {
496  msg_set_bits(m, 1, 16, 0x1fff, n);
497 }
498 
499 static inline u32 msg_node_sig(struct tipc_msg *m)
500 {
501  return msg_bits(m, 1, 0, 0xffff);
502 }
503 
504 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
505 {
506  msg_set_bits(m, 1, 0, 0xffff, n);
507 }
508 
509 
510 /*
511  * Word 2
512  */
513 static inline u32 msg_dest_domain(struct tipc_msg *m)
514 {
515  return msg_word(m, 2);
516 }
517 
518 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
519 {
520  msg_set_word(m, 2, n);
521 }
522 
523 static inline u32 msg_bcgap_after(struct tipc_msg *m)
524 {
525  return msg_bits(m, 2, 16, 0xffff);
526 }
527 
528 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
529 {
530  msg_set_bits(m, 2, 16, 0xffff, n);
531 }
532 
533 static inline u32 msg_bcgap_to(struct tipc_msg *m)
534 {
535  return msg_bits(m, 2, 0, 0xffff);
536 }
537 
538 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
539 {
540  msg_set_bits(m, 2, 0, 0xffff, n);
541 }
542 
543 
544 /*
545  * Word 4
546  */
547 static inline u32 msg_last_bcast(struct tipc_msg *m)
548 {
549  return msg_bits(m, 4, 16, 0xffff);
550 }
551 
552 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
553 {
554  msg_set_bits(m, 4, 16, 0xffff, n);
555 }
556 
557 
558 static inline u32 msg_fragm_no(struct tipc_msg *m)
559 {
560  return msg_bits(m, 4, 16, 0xffff);
561 }
562 
563 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
564 {
565  msg_set_bits(m, 4, 16, 0xffff, n);
566 }
567 
568 
569 static inline u32 msg_next_sent(struct tipc_msg *m)
570 {
571  return msg_bits(m, 4, 0, 0xffff);
572 }
573 
574 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
575 {
576  msg_set_bits(m, 4, 0, 0xffff, n);
577 }
578 
579 
580 static inline u32 msg_long_msgno(struct tipc_msg *m)
581 {
582  return msg_bits(m, 4, 0, 0xffff);
583 }
584 
585 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
586 {
587  msg_set_bits(m, 4, 0, 0xffff, n);
588 }
589 
590 static inline u32 msg_bc_netid(struct tipc_msg *m)
591 {
592  return msg_word(m, 4);
593 }
594 
595 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
596 {
597  msg_set_word(m, 4, id);
598 }
599 
600 static inline u32 msg_link_selector(struct tipc_msg *m)
601 {
602  return msg_bits(m, 4, 0, 1);
603 }
604 
605 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
606 {
607  msg_set_bits(m, 4, 0, 1, n);
608 }
609 
610 /*
611  * Word 5
612  */
613 static inline u32 msg_session(struct tipc_msg *m)
614 {
615  return msg_bits(m, 5, 16, 0xffff);
616 }
617 
618 static inline void msg_set_session(struct tipc_msg *m, u32 n)
619 {
620  msg_set_bits(m, 5, 16, 0xffff, n);
621 }
622 
623 static inline u32 msg_probe(struct tipc_msg *m)
624 {
625  return msg_bits(m, 5, 0, 1);
626 }
627 
628 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
629 {
630  msg_set_bits(m, 5, 0, 1, val);
631 }
632 
633 static inline char msg_net_plane(struct tipc_msg *m)
634 {
635  return msg_bits(m, 5, 1, 7) + 'A';
636 }
637 
638 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
639 {
640  msg_set_bits(m, 5, 1, 7, (n - 'A'));
641 }
642 
643 static inline u32 msg_linkprio(struct tipc_msg *m)
644 {
645  return msg_bits(m, 5, 4, 0x1f);
646 }
647 
648 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
649 {
650  msg_set_bits(m, 5, 4, 0x1f, n);
651 }
652 
653 static inline u32 msg_bearer_id(struct tipc_msg *m)
654 {
655  return msg_bits(m, 5, 9, 0x7);
656 }
657 
658 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
659 {
660  msg_set_bits(m, 5, 9, 0x7, n);
661 }
662 
663 static inline u32 msg_redundant_link(struct tipc_msg *m)
664 {
665  return msg_bits(m, 5, 12, 0x1);
666 }
667 
668 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
669 {
670  msg_set_bits(m, 5, 12, 0x1, r);
671 }
672 
673 static inline char *msg_media_addr(struct tipc_msg *m)
674 {
675  return (char *)&m->hdr[TIPC_MEDIA_ADDR_OFFSET];
676 }
677 
678 /*
679  * Word 9
680  */
681 static inline u32 msg_msgcnt(struct tipc_msg *m)
682 {
683  return msg_bits(m, 9, 16, 0xffff);
684 }
685 
686 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
687 {
688  msg_set_bits(m, 9, 16, 0xffff, n);
689 }
690 
691 static inline u32 msg_bcast_tag(struct tipc_msg *m)
692 {
693  return msg_bits(m, 9, 16, 0xffff);
694 }
695 
696 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
697 {
698  msg_set_bits(m, 9, 16, 0xffff, n);
699 }
700 
701 static inline u32 msg_max_pkt(struct tipc_msg *m)
702 {
703  return msg_bits(m, 9, 16, 0xffff) * 4;
704 }
705 
706 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
707 {
708  msg_set_bits(m, 9, 16, 0xffff, (n / 4));
709 }
710 
711 static inline u32 msg_link_tolerance(struct tipc_msg *m)
712 {
713  return msg_bits(m, 9, 0, 0xffff);
714 }
715 
716 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
717 {
718  msg_set_bits(m, 9, 0, 0xffff, n);
719 }
720 
721 u32 tipc_msg_tot_importance(struct tipc_msg *m);
722 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
723  u32 hsize, u32 destnode);
724 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
725  u32 num_sect, unsigned int total_len,
726  int max_size, int usrmem, struct sk_buff **buf);
727 #endif
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