xref: /linux/net/tipc/msg.h (revision 2fe05e1139a555ae91f00a812cb9520e7d3022ab) 
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 #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 
69 /*
70  * Internal message users
71  */
72 #define  BCAST_PROTOCOL       5
73 #define  MSG_BUNDLER          6
74 #define  LINK_PROTOCOL        7
75 #define  CONN_MANAGER         8
76 #define  TUNNEL_PROTOCOL      10
77 #define  NAME_DISTRIBUTOR     11
78 #define  MSG_FRAGMENTER       12
79 #define  LINK_CONFIG          13
80 #define  SOCK_WAKEUP          14       /* pseudo user */
81 
82 /*
83  * Message header sizes
84  */
85 #define SHORT_H_SIZE              24	/* In-cluster basic payload message */
86 #define BASIC_H_SIZE              32	/* Basic payload message */
87 #define NAMED_H_SIZE              40	/* Named payload message */
88 #define MCAST_H_SIZE              44	/* Multicast payload message */
89 #define INT_H_SIZE                40	/* Internal messages */
90 #define MIN_H_SIZE                24	/* Smallest legal TIPC header size */
91 #define MAX_H_SIZE                60	/* Largest possible TIPC header size */
92 
93 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
94 
95 #define TIPC_MEDIA_INFO_OFFSET	5
96 
97 struct tipc_skb_cb {
98 	u32 bytes_read;
99 	struct sk_buff *tail;
100 	bool validated;
101 	u16 chain_imp;
102 	u16 ackers;
103 };
104 
105 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
106 
107 struct tipc_msg {
108 	__be32 hdr[15];
109 };
110 
111 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
112 {
113 	return (struct tipc_msg *)skb->data;
114 }
115 
116 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
117 {
118 	return ntohl(m->hdr[pos]);
119 }
120 
121 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
122 {
123 	m->hdr[w] = htonl(val);
124 }
125 
126 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
127 {
128 	return (msg_word(m, w) >> pos) & mask;
129 }
130 
131 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
132 				u32 pos, u32 mask, u32 val)
133 {
134 	val = (val & mask) << pos;
135 	mask = mask << pos;
136 	m->hdr[w] &= ~htonl(mask);
137 	m->hdr[w] |= htonl(val);
138 }
139 
140 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
141 {
142 	u32 temp = msg->hdr[a];
143 
144 	msg->hdr[a] = msg->hdr[b];
145 	msg->hdr[b] = temp;
146 }
147 
148 /*
149  * Word 0
150  */
151 static inline u32 msg_version(struct tipc_msg *m)
152 {
153 	return msg_bits(m, 0, 29, 7);
154 }
155 
156 static inline void msg_set_version(struct tipc_msg *m)
157 {
158 	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
159 }
160 
161 static inline u32 msg_user(struct tipc_msg *m)
162 {
163 	return msg_bits(m, 0, 25, 0xf);
164 }
165 
166 static inline u32 msg_isdata(struct tipc_msg *m)
167 {
168 	return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
169 }
170 
171 static inline void msg_set_user(struct tipc_msg *m, u32 n)
172 {
173 	msg_set_bits(m, 0, 25, 0xf, n);
174 }
175 
176 static inline u32 msg_hdr_sz(struct tipc_msg *m)
177 {
178 	return msg_bits(m, 0, 21, 0xf) << 2;
179 }
180 
181 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
182 {
183 	msg_set_bits(m, 0, 21, 0xf, n>>2);
184 }
185 
186 static inline u32 msg_size(struct tipc_msg *m)
187 {
188 	return msg_bits(m, 0, 0, 0x1ffff);
189 }
190 
191 static inline u32 msg_data_sz(struct tipc_msg *m)
192 {
193 	return msg_size(m) - msg_hdr_sz(m);
194 }
195 
196 static inline int msg_non_seq(struct tipc_msg *m)
197 {
198 	return msg_bits(m, 0, 20, 1);
199 }
200 
201 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
202 {
203 	msg_set_bits(m, 0, 20, 1, n);
204 }
205 
206 static inline int msg_dest_droppable(struct tipc_msg *m)
207 {
208 	return msg_bits(m, 0, 19, 1);
209 }
210 
211 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
212 {
213 	msg_set_bits(m, 0, 19, 1, d);
214 }
215 
216 static inline int msg_src_droppable(struct tipc_msg *m)
217 {
218 	return msg_bits(m, 0, 18, 1);
219 }
220 
221 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
222 {
223 	msg_set_bits(m, 0, 18, 1, d);
224 }
225 
226 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
227 {
228 	m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
229 }
230 
231 static inline unchar *msg_data(struct tipc_msg *m)
232 {
233 	return ((unchar *)m) + msg_hdr_sz(m);
234 }
235 
236 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
237 {
238 	return (struct tipc_msg *)msg_data(m);
239 }
240 
241 /*
242  * Word 1
243  */
244 static inline u32 msg_type(struct tipc_msg *m)
245 {
246 	return msg_bits(m, 1, 29, 0x7);
247 }
248 
249 static inline void msg_set_type(struct tipc_msg *m, u32 n)
250 {
251 	msg_set_bits(m, 1, 29, 0x7, n);
252 }
253 
254 static inline u32 msg_named(struct tipc_msg *m)
255 {
256 	return msg_type(m) == TIPC_NAMED_MSG;
257 }
258 
259 static inline u32 msg_mcast(struct tipc_msg *m)
260 {
261 	return msg_type(m) == TIPC_MCAST_MSG;
262 }
263 
264 static inline u32 msg_connected(struct tipc_msg *m)
265 {
266 	return msg_type(m) == TIPC_CONN_MSG;
267 }
268 
269 static inline u32 msg_errcode(struct tipc_msg *m)
270 {
271 	return msg_bits(m, 1, 25, 0xf);
272 }
273 
274 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
275 {
276 	msg_set_bits(m, 1, 25, 0xf, err);
277 }
278 
279 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
280 {
281 	return msg_bits(m, 1, 21, 0xf);
282 }
283 
284 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
285 {
286 	msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
287 }
288 
289 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
290 {
291 	msg_set_bits(m, 1, 21, 0xf, 0);
292 }
293 
294 static inline u32 msg_lookup_scope(struct tipc_msg *m)
295 {
296 	return msg_bits(m, 1, 19, 0x3);
297 }
298 
299 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
300 {
301 	msg_set_bits(m, 1, 19, 0x3, n);
302 }
303 
304 static inline u16 msg_bcast_ack(struct tipc_msg *m)
305 {
306 	return msg_bits(m, 1, 0, 0xffff);
307 }
308 
309 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
310 {
311 	msg_set_bits(m, 1, 0, 0xffff, n);
312 }
313 
314 
315 /*
316  * Word 2
317  */
318 static inline u16 msg_ack(struct tipc_msg *m)
319 {
320 	return msg_bits(m, 2, 16, 0xffff);
321 }
322 
323 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
324 {
325 	msg_set_bits(m, 2, 16, 0xffff, n);
326 }
327 
328 static inline u16 msg_seqno(struct tipc_msg *m)
329 {
330 	return msg_bits(m, 2, 0, 0xffff);
331 }
332 
333 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
334 {
335 	msg_set_bits(m, 2, 0, 0xffff, n);
336 }
337 
338 /*
339  * Words 3-10
340  */
341 static inline u32 msg_importance(struct tipc_msg *m)
342 {
343 	int usr = msg_user(m);
344 
345 	if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
346 		return usr;
347 	if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
348 		return msg_bits(m, 9, 0, 0x7);
349 	return TIPC_SYSTEM_IMPORTANCE;
350 }
351 
352 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
353 {
354 	int usr = msg_user(m);
355 
356 	if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
357 		msg_set_bits(m, 9, 0, 0x7, i);
358 	else if (i < TIPC_SYSTEM_IMPORTANCE)
359 		msg_set_user(m, i);
360 	else
361 		pr_warn("Trying to set illegal importance in message\n");
362 }
363 
364 static inline u32 msg_prevnode(struct tipc_msg *m)
365 {
366 	return msg_word(m, 3);
367 }
368 
369 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
370 {
371 	msg_set_word(m, 3, a);
372 }
373 
374 static inline u32 msg_origport(struct tipc_msg *m)
375 {
376 	if (msg_user(m) == MSG_FRAGMENTER)
377 		m = msg_get_wrapped(m);
378 	return msg_word(m, 4);
379 }
380 
381 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
382 {
383 	msg_set_word(m, 4, p);
384 }
385 
386 static inline u32 msg_destport(struct tipc_msg *m)
387 {
388 	return msg_word(m, 5);
389 }
390 
391 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
392 {
393 	msg_set_word(m, 5, p);
394 }
395 
396 static inline u32 msg_mc_netid(struct tipc_msg *m)
397 {
398 	return msg_word(m, 5);
399 }
400 
401 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
402 {
403 	msg_set_word(m, 5, p);
404 }
405 
406 static inline int msg_short(struct tipc_msg *m)
407 {
408 	return msg_hdr_sz(m) == SHORT_H_SIZE;
409 }
410 
411 static inline u32 msg_orignode(struct tipc_msg *m)
412 {
413 	if (likely(msg_short(m)))
414 		return msg_prevnode(m);
415 	return msg_word(m, 6);
416 }
417 
418 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
419 {
420 	msg_set_word(m, 6, a);
421 }
422 
423 static inline u32 msg_destnode(struct tipc_msg *m)
424 {
425 	return msg_word(m, 7);
426 }
427 
428 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
429 {
430 	msg_set_word(m, 7, a);
431 }
432 
433 static inline u32 msg_nametype(struct tipc_msg *m)
434 {
435 	return msg_word(m, 8);
436 }
437 
438 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
439 {
440 	msg_set_word(m, 8, n);
441 }
442 
443 static inline u32 msg_nameinst(struct tipc_msg *m)
444 {
445 	return msg_word(m, 9);
446 }
447 
448 static inline u32 msg_namelower(struct tipc_msg *m)
449 {
450 	return msg_nameinst(m);
451 }
452 
453 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
454 {
455 	msg_set_word(m, 9, n);
456 }
457 
458 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
459 {
460 	msg_set_namelower(m, n);
461 }
462 
463 static inline u32 msg_nameupper(struct tipc_msg *m)
464 {
465 	return msg_word(m, 10);
466 }
467 
468 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
469 {
470 	msg_set_word(m, 10, n);
471 }
472 
473 /*
474  * Constants and routines used to read and write TIPC internal message headers
475  */
476 
477 /*
478  *  Connection management protocol message types
479  */
480 #define CONN_PROBE        0
481 #define CONN_PROBE_REPLY  1
482 #define CONN_ACK          2
483 
484 /*
485  * Name distributor message types
486  */
487 #define PUBLICATION       0
488 #define WITHDRAWAL        1
489 
490 /*
491  * Segmentation message types
492  */
493 #define FIRST_FRAGMENT		0
494 #define FRAGMENT		1
495 #define LAST_FRAGMENT		2
496 
497 /*
498  * Link management protocol message types
499  */
500 #define STATE_MSG		0
501 #define RESET_MSG		1
502 #define ACTIVATE_MSG		2
503 
504 /*
505  * Changeover tunnel message types
506  */
507 #define SYNCH_MSG		0
508 #define FAILOVER_MSG		1
509 
510 /*
511  * Config protocol message types
512  */
513 #define DSC_REQ_MSG		0
514 #define DSC_RESP_MSG		1
515 
516 /*
517  * Word 1
518  */
519 static inline u32 msg_seq_gap(struct tipc_msg *m)
520 {
521 	return msg_bits(m, 1, 16, 0x1fff);
522 }
523 
524 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
525 {
526 	msg_set_bits(m, 1, 16, 0x1fff, n);
527 }
528 
529 static inline u32 msg_node_sig(struct tipc_msg *m)
530 {
531 	return msg_bits(m, 1, 0, 0xffff);
532 }
533 
534 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
535 {
536 	msg_set_bits(m, 1, 0, 0xffff, n);
537 }
538 
539 static inline u32 msg_node_capabilities(struct tipc_msg *m)
540 {
541 	return msg_bits(m, 1, 15, 0x1fff);
542 }
543 
544 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
545 {
546 	msg_set_bits(m, 1, 15, 0x1fff, n);
547 }
548 
549 /*
550  * Word 2
551  */
552 static inline u32 msg_dest_domain(struct tipc_msg *m)
553 {
554 	return msg_word(m, 2);
555 }
556 
557 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
558 {
559 	msg_set_word(m, 2, n);
560 }
561 
562 static inline u32 msg_bcgap_after(struct tipc_msg *m)
563 {
564 	return msg_bits(m, 2, 16, 0xffff);
565 }
566 
567 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
568 {
569 	msg_set_bits(m, 2, 16, 0xffff, n);
570 }
571 
572 static inline u32 msg_bcgap_to(struct tipc_msg *m)
573 {
574 	return msg_bits(m, 2, 0, 0xffff);
575 }
576 
577 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
578 {
579 	msg_set_bits(m, 2, 0, 0xffff, n);
580 }
581 
582 
583 /*
584  * Word 4
585  */
586 static inline u32 msg_last_bcast(struct tipc_msg *m)
587 {
588 	return msg_bits(m, 4, 16, 0xffff);
589 }
590 
591 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
592 {
593 	return msg_last_bcast(m) + 1;
594 }
595 
596 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
597 {
598 	msg_set_bits(m, 4, 16, 0xffff, n);
599 }
600 
601 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
602 {
603 	msg_set_bits(m, 4, 16, 0xffff, n);
604 }
605 
606 
607 static inline u16 msg_next_sent(struct tipc_msg *m)
608 {
609 	return msg_bits(m, 4, 0, 0xffff);
610 }
611 
612 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
613 {
614 	msg_set_bits(m, 4, 0, 0xffff, n);
615 }
616 
617 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
618 {
619 	msg_set_bits(m, 4, 0, 0xffff, n);
620 }
621 
622 static inline u32 msg_bc_netid(struct tipc_msg *m)
623 {
624 	return msg_word(m, 4);
625 }
626 
627 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
628 {
629 	msg_set_word(m, 4, id);
630 }
631 
632 static inline u32 msg_link_selector(struct tipc_msg *m)
633 {
634 	if (msg_user(m) == MSG_FRAGMENTER)
635 		m = (void *)msg_data(m);
636 	return msg_bits(m, 4, 0, 1);
637 }
638 
639 /*
640  * Word 5
641  */
642 static inline u16 msg_session(struct tipc_msg *m)
643 {
644 	return msg_bits(m, 5, 16, 0xffff);
645 }
646 
647 static inline void msg_set_session(struct tipc_msg *m, u16 n)
648 {
649 	msg_set_bits(m, 5, 16, 0xffff, n);
650 }
651 
652 static inline u32 msg_probe(struct tipc_msg *m)
653 {
654 	return msg_bits(m, 5, 0, 1);
655 }
656 
657 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
658 {
659 	msg_set_bits(m, 5, 0, 1, val);
660 }
661 
662 static inline char msg_net_plane(struct tipc_msg *m)
663 {
664 	return msg_bits(m, 5, 1, 7) + 'A';
665 }
666 
667 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
668 {
669 	msg_set_bits(m, 5, 1, 7, (n - 'A'));
670 }
671 
672 static inline u32 msg_linkprio(struct tipc_msg *m)
673 {
674 	return msg_bits(m, 5, 4, 0x1f);
675 }
676 
677 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
678 {
679 	msg_set_bits(m, 5, 4, 0x1f, n);
680 }
681 
682 static inline u32 msg_bearer_id(struct tipc_msg *m)
683 {
684 	return msg_bits(m, 5, 9, 0x7);
685 }
686 
687 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
688 {
689 	msg_set_bits(m, 5, 9, 0x7, n);
690 }
691 
692 static inline u32 msg_redundant_link(struct tipc_msg *m)
693 {
694 	return msg_bits(m, 5, 12, 0x1);
695 }
696 
697 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
698 {
699 	msg_set_bits(m, 5, 12, 0x1, r);
700 }
701 
702 static inline u32 msg_peer_stopping(struct tipc_msg *m)
703 {
704 	return msg_bits(m, 5, 13, 0x1);
705 }
706 
707 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
708 {
709 	msg_set_bits(m, 5, 13, 0x1, s);
710 }
711 
712 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
713 {
714 	switch (msg_user(m)) {
715 	case BCAST_PROTOCOL:
716 	case NAME_DISTRIBUTOR:
717 	case LINK_PROTOCOL:
718 		return msg_bits(m, 5, 14, 0x1);
719 	default:
720 		return false;
721 	}
722 }
723 
724 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
725 {
726 	msg_set_bits(m, 5, 14, 0x1, invalid);
727 }
728 
729 static inline char *msg_media_addr(struct tipc_msg *m)
730 {
731 	return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
732 }
733 
734 static inline u32 msg_bc_gap(struct tipc_msg *m)
735 {
736 	return msg_bits(m, 8, 0, 0x3ff);
737 }
738 
739 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
740 {
741 	msg_set_bits(m, 8, 0, 0x3ff, n);
742 }
743 
744 /*
745  * Word 9
746  */
747 static inline u16 msg_msgcnt(struct tipc_msg *m)
748 {
749 	return msg_bits(m, 9, 16, 0xffff);
750 }
751 
752 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
753 {
754 	msg_set_bits(m, 9, 16, 0xffff, n);
755 }
756 
757 static inline u32 msg_conn_ack(struct tipc_msg *m)
758 {
759 	return msg_bits(m, 9, 16, 0xffff);
760 }
761 
762 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
763 {
764 	msg_set_bits(m, 9, 16, 0xffff, n);
765 }
766 
767 static inline u32 msg_adv_win(struct tipc_msg *m)
768 {
769 	return msg_bits(m, 9, 0, 0xffff);
770 }
771 
772 static inline void msg_set_adv_win(struct tipc_msg *m, u32 n)
773 {
774 	msg_set_bits(m, 9, 0, 0xffff, n);
775 }
776 
777 static inline u32 msg_max_pkt(struct tipc_msg *m)
778 {
779 	return msg_bits(m, 9, 16, 0xffff) * 4;
780 }
781 
782 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
783 {
784 	msg_set_bits(m, 9, 16, 0xffff, (n / 4));
785 }
786 
787 static inline u32 msg_link_tolerance(struct tipc_msg *m)
788 {
789 	return msg_bits(m, 9, 0, 0xffff);
790 }
791 
792 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
793 {
794 	msg_set_bits(m, 9, 0, 0xffff, n);
795 }
796 
797 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
798 {
799 	if (likely(msg_user(m) != LINK_PROTOCOL))
800 		return true;
801 	if (msg_type(m) == STATE_MSG)
802 		return true;
803 	return false;
804 }
805 
806 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
807 {
808 	if (msg_peer_link_is_up(m))
809 		return true;
810 	return msg_redundant_link(m);
811 }
812 
813 static inline bool msg_is_reset(struct tipc_msg *hdr)
814 {
815 	return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
816 }
817 
818 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
819 bool tipc_msg_validate(struct sk_buff *skb);
820 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
821 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
822 		   u32 hsize, u32 destnode);
823 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
824 				uint data_sz, u32 dnode, u32 onode,
825 				u32 dport, u32 oport, int errcode);
826 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
827 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
828 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
829 			  u32 mtu, u32 dnode);
830 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
831 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
832 		   int offset, int dsz, int mtu, struct sk_buff_head *list);
833 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
834 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
835 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
836 			struct sk_buff_head *cpy);
837 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
838 			     struct sk_buff *skb);
839 
840 static inline u16 buf_seqno(struct sk_buff *skb)
841 {
842 	return msg_seqno(buf_msg(skb));
843 }
844 
845 /* tipc_skb_peek(): peek and reserve first buffer in list
846  * @list: list to be peeked in
847  * Returns pointer to first buffer in list, if any
848  */
849 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
850 					    spinlock_t *lock)
851 {
852 	struct sk_buff *skb;
853 
854 	spin_lock_bh(lock);
855 	skb = skb_peek(list);
856 	if (skb)
857 		skb_get(skb);
858 	spin_unlock_bh(lock);
859 	return skb;
860 }
861 
862 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
863  *                       up to and including 'filter'.
864  * Note: ignoring previously tried destinations minimizes the risk of
865  *       contention on the socket lock
866  * @list: list to be peeked in
867  * @filter: last destination to be ignored from search
868  * Returns a destination port number, of applicable.
869  */
870 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
871 {
872 	struct sk_buff *skb;
873 	u32 dport = 0;
874 	bool ignore = true;
875 
876 	spin_lock_bh(&list->lock);
877 	skb_queue_walk(list, skb) {
878 		dport = msg_destport(buf_msg(skb));
879 		if (!filter || skb_queue_is_last(list, skb))
880 			break;
881 		if (dport == filter)
882 			ignore = false;
883 		else if (!ignore)
884 			break;
885 	}
886 	spin_unlock_bh(&list->lock);
887 	return dport;
888 }
889 
890 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
891  * @list: list to be unlinked from
892  * @dport: selection criteria for buffer to unlink
893  */
894 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
895 					       u32 dport)
896 {
897 	struct sk_buff *_skb, *tmp, *skb = NULL;
898 
899 	spin_lock_bh(&list->lock);
900 	skb_queue_walk_safe(list, _skb, tmp) {
901 		if (msg_destport(buf_msg(_skb)) == dport) {
902 			__skb_unlink(_skb, list);
903 			skb = _skb;
904 			break;
905 		}
906 	}
907 	spin_unlock_bh(&list->lock);
908 	return skb;
909 }
910 
911 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
912  * @list: the new list to append. Not lock protected
913  * @head: target list. Lock protected.
914  */
915 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
916 					      struct sk_buff_head *head)
917 {
918 	spin_lock_bh(&head->lock);
919 	skb_queue_splice_tail(list, head);
920 	spin_unlock_bh(&head->lock);
921 }
922 
923 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
924  * @list: the new list to add. Lock protected. Will be reinitialized
925  * @head: target list. Lock protected.
926  */
927 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
928 						   struct sk_buff_head *head)
929 {
930 	struct sk_buff_head tmp;
931 
932 	__skb_queue_head_init(&tmp);
933 
934 	spin_lock_bh(&list->lock);
935 	skb_queue_splice_tail_init(list, &tmp);
936 	spin_unlock_bh(&list->lock);
937 	tipc_skb_queue_splice_tail(&tmp, head);
938 }
939 
940 #endif
941