xref: /linux/net/tipc/msg.h (revision f3a8b6645dc2e60d11f20c1c23afd964ff4e55ae) 
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 	void *handle;
99 	struct sk_buff *tail;
100 	bool validated;
101 	bool wakeup_pending;
102 	u16 chain_sz;
103 	u16 chain_imp;
104 	u16 ackers;
105 };
106 
107 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
108 
109 struct tipc_msg {
110 	__be32 hdr[15];
111 };
112 
113 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
114 {
115 	return (struct tipc_msg *)skb->data;
116 }
117 
118 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
119 {
120 	return ntohl(m->hdr[pos]);
121 }
122 
123 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
124 {
125 	m->hdr[w] = htonl(val);
126 }
127 
128 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
129 {
130 	return (msg_word(m, w) >> pos) & mask;
131 }
132 
133 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
134 				u32 pos, u32 mask, u32 val)
135 {
136 	val = (val & mask) << pos;
137 	mask = mask << pos;
138 	m->hdr[w] &= ~htonl(mask);
139 	m->hdr[w] |= htonl(val);
140 }
141 
142 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
143 {
144 	u32 temp = msg->hdr[a];
145 
146 	msg->hdr[a] = msg->hdr[b];
147 	msg->hdr[b] = temp;
148 }
149 
150 /*
151  * Word 0
152  */
153 static inline u32 msg_version(struct tipc_msg *m)
154 {
155 	return msg_bits(m, 0, 29, 7);
156 }
157 
158 static inline void msg_set_version(struct tipc_msg *m)
159 {
160 	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
161 }
162 
163 static inline u32 msg_user(struct tipc_msg *m)
164 {
165 	return msg_bits(m, 0, 25, 0xf);
166 }
167 
168 static inline u32 msg_isdata(struct tipc_msg *m)
169 {
170 	return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
171 }
172 
173 static inline void msg_set_user(struct tipc_msg *m, u32 n)
174 {
175 	msg_set_bits(m, 0, 25, 0xf, n);
176 }
177 
178 static inline u32 msg_hdr_sz(struct tipc_msg *m)
179 {
180 	return msg_bits(m, 0, 21, 0xf) << 2;
181 }
182 
183 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
184 {
185 	msg_set_bits(m, 0, 21, 0xf, n>>2);
186 }
187 
188 static inline u32 msg_size(struct tipc_msg *m)
189 {
190 	return msg_bits(m, 0, 0, 0x1ffff);
191 }
192 
193 static inline u32 msg_data_sz(struct tipc_msg *m)
194 {
195 	return msg_size(m) - msg_hdr_sz(m);
196 }
197 
198 static inline int msg_non_seq(struct tipc_msg *m)
199 {
200 	return msg_bits(m, 0, 20, 1);
201 }
202 
203 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
204 {
205 	msg_set_bits(m, 0, 20, 1, n);
206 }
207 
208 static inline int msg_dest_droppable(struct tipc_msg *m)
209 {
210 	return msg_bits(m, 0, 19, 1);
211 }
212 
213 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
214 {
215 	msg_set_bits(m, 0, 19, 1, d);
216 }
217 
218 static inline int msg_src_droppable(struct tipc_msg *m)
219 {
220 	return msg_bits(m, 0, 18, 1);
221 }
222 
223 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
224 {
225 	msg_set_bits(m, 0, 18, 1, d);
226 }
227 
228 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
229 {
230 	m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
231 }
232 
233 static inline unchar *msg_data(struct tipc_msg *m)
234 {
235 	return ((unchar *)m) + msg_hdr_sz(m);
236 }
237 
238 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
239 {
240 	return (struct tipc_msg *)msg_data(m);
241 }
242 
243 /*
244  * Word 1
245  */
246 static inline u32 msg_type(struct tipc_msg *m)
247 {
248 	return msg_bits(m, 1, 29, 0x7);
249 }
250 
251 static inline void msg_set_type(struct tipc_msg *m, u32 n)
252 {
253 	msg_set_bits(m, 1, 29, 0x7, n);
254 }
255 
256 static inline u32 msg_named(struct tipc_msg *m)
257 {
258 	return msg_type(m) == TIPC_NAMED_MSG;
259 }
260 
261 static inline u32 msg_mcast(struct tipc_msg *m)
262 {
263 	return msg_type(m) == TIPC_MCAST_MSG;
264 }
265 
266 static inline u32 msg_connected(struct tipc_msg *m)
267 {
268 	return msg_type(m) == TIPC_CONN_MSG;
269 }
270 
271 static inline u32 msg_errcode(struct tipc_msg *m)
272 {
273 	return msg_bits(m, 1, 25, 0xf);
274 }
275 
276 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
277 {
278 	msg_set_bits(m, 1, 25, 0xf, err);
279 }
280 
281 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
282 {
283 	return msg_bits(m, 1, 21, 0xf);
284 }
285 
286 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
287 {
288 	msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
289 }
290 
291 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
292 {
293 	msg_set_bits(m, 1, 21, 0xf, 0);
294 }
295 
296 static inline u32 msg_lookup_scope(struct tipc_msg *m)
297 {
298 	return msg_bits(m, 1, 19, 0x3);
299 }
300 
301 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
302 {
303 	msg_set_bits(m, 1, 19, 0x3, n);
304 }
305 
306 static inline u16 msg_bcast_ack(struct tipc_msg *m)
307 {
308 	return msg_bits(m, 1, 0, 0xffff);
309 }
310 
311 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
312 {
313 	msg_set_bits(m, 1, 0, 0xffff, n);
314 }
315 
316 
317 /*
318  * Word 2
319  */
320 static inline u16 msg_ack(struct tipc_msg *m)
321 {
322 	return msg_bits(m, 2, 16, 0xffff);
323 }
324 
325 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
326 {
327 	msg_set_bits(m, 2, 16, 0xffff, n);
328 }
329 
330 static inline u16 msg_seqno(struct tipc_msg *m)
331 {
332 	return msg_bits(m, 2, 0, 0xffff);
333 }
334 
335 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
336 {
337 	msg_set_bits(m, 2, 0, 0xffff, n);
338 }
339 
340 /*
341  * Words 3-10
342  */
343 static inline u32 msg_importance(struct tipc_msg *m)
344 {
345 	int usr = msg_user(m);
346 
347 	if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
348 		return usr;
349 	if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
350 		return msg_bits(m, 9, 0, 0x7);
351 	return TIPC_SYSTEM_IMPORTANCE;
352 }
353 
354 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
355 {
356 	int usr = msg_user(m);
357 
358 	if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
359 		msg_set_bits(m, 9, 0, 0x7, i);
360 	else if (i < TIPC_SYSTEM_IMPORTANCE)
361 		msg_set_user(m, i);
362 	else
363 		pr_warn("Trying to set illegal importance in message\n");
364 }
365 
366 static inline u32 msg_prevnode(struct tipc_msg *m)
367 {
368 	return msg_word(m, 3);
369 }
370 
371 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
372 {
373 	msg_set_word(m, 3, a);
374 }
375 
376 static inline u32 msg_origport(struct tipc_msg *m)
377 {
378 	if (msg_user(m) == MSG_FRAGMENTER)
379 		m = msg_get_wrapped(m);
380 	return msg_word(m, 4);
381 }
382 
383 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
384 {
385 	msg_set_word(m, 4, p);
386 }
387 
388 static inline u32 msg_destport(struct tipc_msg *m)
389 {
390 	return msg_word(m, 5);
391 }
392 
393 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
394 {
395 	msg_set_word(m, 5, p);
396 }
397 
398 static inline u32 msg_mc_netid(struct tipc_msg *m)
399 {
400 	return msg_word(m, 5);
401 }
402 
403 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
404 {
405 	msg_set_word(m, 5, p);
406 }
407 
408 static inline int msg_short(struct tipc_msg *m)
409 {
410 	return msg_hdr_sz(m) == SHORT_H_SIZE;
411 }
412 
413 static inline u32 msg_orignode(struct tipc_msg *m)
414 {
415 	if (likely(msg_short(m)))
416 		return msg_prevnode(m);
417 	return msg_word(m, 6);
418 }
419 
420 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
421 {
422 	msg_set_word(m, 6, a);
423 }
424 
425 static inline u32 msg_destnode(struct tipc_msg *m)
426 {
427 	return msg_word(m, 7);
428 }
429 
430 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
431 {
432 	msg_set_word(m, 7, a);
433 }
434 
435 static inline u32 msg_nametype(struct tipc_msg *m)
436 {
437 	return msg_word(m, 8);
438 }
439 
440 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
441 {
442 	msg_set_word(m, 8, n);
443 }
444 
445 static inline u32 msg_nameinst(struct tipc_msg *m)
446 {
447 	return msg_word(m, 9);
448 }
449 
450 static inline u32 msg_namelower(struct tipc_msg *m)
451 {
452 	return msg_nameinst(m);
453 }
454 
455 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
456 {
457 	msg_set_word(m, 9, n);
458 }
459 
460 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
461 {
462 	msg_set_namelower(m, n);
463 }
464 
465 static inline u32 msg_nameupper(struct tipc_msg *m)
466 {
467 	return msg_word(m, 10);
468 }
469 
470 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
471 {
472 	msg_set_word(m, 10, n);
473 }
474 
475 /*
476  * Constants and routines used to read and write TIPC internal message headers
477  */
478 
479 /*
480  *  Connection management protocol message types
481  */
482 #define CONN_PROBE        0
483 #define CONN_PROBE_REPLY  1
484 #define CONN_ACK          2
485 
486 /*
487  * Name distributor message types
488  */
489 #define PUBLICATION       0
490 #define WITHDRAWAL        1
491 
492 /*
493  * Segmentation message types
494  */
495 #define FIRST_FRAGMENT		0
496 #define FRAGMENT		1
497 #define LAST_FRAGMENT		2
498 
499 /*
500  * Link management protocol message types
501  */
502 #define STATE_MSG		0
503 #define RESET_MSG		1
504 #define ACTIVATE_MSG		2
505 
506 /*
507  * Changeover tunnel message types
508  */
509 #define SYNCH_MSG		0
510 #define FAILOVER_MSG		1
511 
512 /*
513  * Config protocol message types
514  */
515 #define DSC_REQ_MSG		0
516 #define DSC_RESP_MSG		1
517 
518 /*
519  * Word 1
520  */
521 static inline u32 msg_seq_gap(struct tipc_msg *m)
522 {
523 	return msg_bits(m, 1, 16, 0x1fff);
524 }
525 
526 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
527 {
528 	msg_set_bits(m, 1, 16, 0x1fff, n);
529 }
530 
531 static inline u32 msg_node_sig(struct tipc_msg *m)
532 {
533 	return msg_bits(m, 1, 0, 0xffff);
534 }
535 
536 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
537 {
538 	msg_set_bits(m, 1, 0, 0xffff, n);
539 }
540 
541 static inline u32 msg_node_capabilities(struct tipc_msg *m)
542 {
543 	return msg_bits(m, 1, 15, 0x1fff);
544 }
545 
546 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
547 {
548 	msg_set_bits(m, 1, 15, 0x1fff, n);
549 }
550 
551 /*
552  * Word 2
553  */
554 static inline u32 msg_dest_domain(struct tipc_msg *m)
555 {
556 	return msg_word(m, 2);
557 }
558 
559 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
560 {
561 	msg_set_word(m, 2, n);
562 }
563 
564 static inline u32 msg_bcgap_after(struct tipc_msg *m)
565 {
566 	return msg_bits(m, 2, 16, 0xffff);
567 }
568 
569 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
570 {
571 	msg_set_bits(m, 2, 16, 0xffff, n);
572 }
573 
574 static inline u32 msg_bcgap_to(struct tipc_msg *m)
575 {
576 	return msg_bits(m, 2, 0, 0xffff);
577 }
578 
579 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
580 {
581 	msg_set_bits(m, 2, 0, 0xffff, n);
582 }
583 
584 
585 /*
586  * Word 4
587  */
588 static inline u32 msg_last_bcast(struct tipc_msg *m)
589 {
590 	return msg_bits(m, 4, 16, 0xffff);
591 }
592 
593 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
594 {
595 	return msg_last_bcast(m) + 1;
596 }
597 
598 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
599 {
600 	msg_set_bits(m, 4, 16, 0xffff, n);
601 }
602 
603 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
604 {
605 	msg_set_bits(m, 4, 16, 0xffff, n);
606 }
607 
608 
609 static inline u16 msg_next_sent(struct tipc_msg *m)
610 {
611 	return msg_bits(m, 4, 0, 0xffff);
612 }
613 
614 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
615 {
616 	msg_set_bits(m, 4, 0, 0xffff, n);
617 }
618 
619 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
620 {
621 	msg_set_bits(m, 4, 0, 0xffff, n);
622 }
623 
624 static inline u32 msg_bc_netid(struct tipc_msg *m)
625 {
626 	return msg_word(m, 4);
627 }
628 
629 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
630 {
631 	msg_set_word(m, 4, id);
632 }
633 
634 static inline u32 msg_link_selector(struct tipc_msg *m)
635 {
636 	return msg_bits(m, 4, 0, 1);
637 }
638 
639 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
640 {
641 	msg_set_bits(m, 4, 0, 1, n);
642 }
643 
644 /*
645  * Word 5
646  */
647 static inline u16 msg_session(struct tipc_msg *m)
648 {
649 	return msg_bits(m, 5, 16, 0xffff);
650 }
651 
652 static inline void msg_set_session(struct tipc_msg *m, u16 n)
653 {
654 	msg_set_bits(m, 5, 16, 0xffff, n);
655 }
656 
657 static inline u32 msg_probe(struct tipc_msg *m)
658 {
659 	return msg_bits(m, 5, 0, 1);
660 }
661 
662 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
663 {
664 	msg_set_bits(m, 5, 0, 1, val);
665 }
666 
667 static inline char msg_net_plane(struct tipc_msg *m)
668 {
669 	return msg_bits(m, 5, 1, 7) + 'A';
670 }
671 
672 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
673 {
674 	msg_set_bits(m, 5, 1, 7, (n - 'A'));
675 }
676 
677 static inline u32 msg_linkprio(struct tipc_msg *m)
678 {
679 	return msg_bits(m, 5, 4, 0x1f);
680 }
681 
682 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
683 {
684 	msg_set_bits(m, 5, 4, 0x1f, n);
685 }
686 
687 static inline u32 msg_bearer_id(struct tipc_msg *m)
688 {
689 	return msg_bits(m, 5, 9, 0x7);
690 }
691 
692 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
693 {
694 	msg_set_bits(m, 5, 9, 0x7, n);
695 }
696 
697 static inline u32 msg_redundant_link(struct tipc_msg *m)
698 {
699 	return msg_bits(m, 5, 12, 0x1);
700 }
701 
702 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
703 {
704 	msg_set_bits(m, 5, 12, 0x1, r);
705 }
706 
707 static inline u32 msg_peer_stopping(struct tipc_msg *m)
708 {
709 	return msg_bits(m, 5, 13, 0x1);
710 }
711 
712 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
713 {
714 	msg_set_bits(m, 5, 13, 0x1, s);
715 }
716 
717 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
718 {
719 	switch (msg_user(m)) {
720 	case BCAST_PROTOCOL:
721 	case NAME_DISTRIBUTOR:
722 	case LINK_PROTOCOL:
723 		return msg_bits(m, 5, 14, 0x1);
724 	default:
725 		return false;
726 	}
727 }
728 
729 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
730 {
731 	msg_set_bits(m, 5, 14, 0x1, invalid);
732 }
733 
734 static inline char *msg_media_addr(struct tipc_msg *m)
735 {
736 	return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
737 }
738 
739 static inline u32 msg_bc_gap(struct tipc_msg *m)
740 {
741 	return msg_bits(m, 8, 0, 0x3ff);
742 }
743 
744 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
745 {
746 	msg_set_bits(m, 8, 0, 0x3ff, n);
747 }
748 
749 /*
750  * Word 9
751  */
752 static inline u16 msg_msgcnt(struct tipc_msg *m)
753 {
754 	return msg_bits(m, 9, 16, 0xffff);
755 }
756 
757 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
758 {
759 	msg_set_bits(m, 9, 16, 0xffff, n);
760 }
761 
762 static inline u32 msg_conn_ack(struct tipc_msg *m)
763 {
764 	return msg_bits(m, 9, 16, 0xffff);
765 }
766 
767 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
768 {
769 	msg_set_bits(m, 9, 16, 0xffff, n);
770 }
771 
772 static inline u32 msg_adv_win(struct tipc_msg *m)
773 {
774 	return msg_bits(m, 9, 0, 0xffff);
775 }
776 
777 static inline void msg_set_adv_win(struct tipc_msg *m, u32 n)
778 {
779 	msg_set_bits(m, 9, 0, 0xffff, n);
780 }
781 
782 static inline u32 msg_max_pkt(struct tipc_msg *m)
783 {
784 	return msg_bits(m, 9, 16, 0xffff) * 4;
785 }
786 
787 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
788 {
789 	msg_set_bits(m, 9, 16, 0xffff, (n / 4));
790 }
791 
792 static inline u32 msg_link_tolerance(struct tipc_msg *m)
793 {
794 	return msg_bits(m, 9, 0, 0xffff);
795 }
796 
797 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
798 {
799 	msg_set_bits(m, 9, 0, 0xffff, n);
800 }
801 
802 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
803 {
804 	if (likely(msg_user(m) != LINK_PROTOCOL))
805 		return true;
806 	if (msg_type(m) == STATE_MSG)
807 		return true;
808 	return false;
809 }
810 
811 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
812 {
813 	if (msg_peer_link_is_up(m))
814 		return true;
815 	return msg_redundant_link(m);
816 }
817 
818 static inline bool msg_is_reset(struct tipc_msg *hdr)
819 {
820 	return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
821 }
822 
823 struct sk_buff *tipc_buf_acquire(u32 size);
824 bool tipc_msg_validate(struct sk_buff *skb);
825 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
826 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
827 		   u32 hsize, u32 destnode);
828 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
829 				uint data_sz, u32 dnode, u32 onode,
830 				u32 dport, u32 oport, int errcode);
831 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
832 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
833 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
834 			  u32 mtu, u32 dnode);
835 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
836 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
837 		   int offset, int dsz, int mtu, struct sk_buff_head *list);
838 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
839 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
840 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
841 			     struct sk_buff *skb);
842 
843 static inline u16 buf_seqno(struct sk_buff *skb)
844 {
845 	return msg_seqno(buf_msg(skb));
846 }
847 
848 /* tipc_skb_peek(): peek and reserve first buffer in list
849  * @list: list to be peeked in
850  * Returns pointer to first buffer in list, if any
851  */
852 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
853 					    spinlock_t *lock)
854 {
855 	struct sk_buff *skb;
856 
857 	spin_lock_bh(lock);
858 	skb = skb_peek(list);
859 	if (skb)
860 		skb_get(skb);
861 	spin_unlock_bh(lock);
862 	return skb;
863 }
864 
865 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
866  *                       up to and including 'filter'.
867  * Note: ignoring previously tried destinations minimizes the risk of
868  *       contention on the socket lock
869  * @list: list to be peeked in
870  * @filter: last destination to be ignored from search
871  * Returns a destination port number, of applicable.
872  */
873 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
874 {
875 	struct sk_buff *skb;
876 	u32 dport = 0;
877 	bool ignore = true;
878 
879 	spin_lock_bh(&list->lock);
880 	skb_queue_walk(list, skb) {
881 		dport = msg_destport(buf_msg(skb));
882 		if (!filter || skb_queue_is_last(list, skb))
883 			break;
884 		if (dport == filter)
885 			ignore = false;
886 		else if (!ignore)
887 			break;
888 	}
889 	spin_unlock_bh(&list->lock);
890 	return dport;
891 }
892 
893 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
894  * @list: list to be unlinked from
895  * @dport: selection criteria for buffer to unlink
896  */
897 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
898 					       u32 dport)
899 {
900 	struct sk_buff *_skb, *tmp, *skb = NULL;
901 
902 	spin_lock_bh(&list->lock);
903 	skb_queue_walk_safe(list, _skb, tmp) {
904 		if (msg_destport(buf_msg(_skb)) == dport) {
905 			__skb_unlink(_skb, list);
906 			skb = _skb;
907 			break;
908 		}
909 	}
910 	spin_unlock_bh(&list->lock);
911 	return skb;
912 }
913 
914 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
915  * @list: the new list to append. Not lock protected
916  * @head: target list. Lock protected.
917  */
918 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
919 					      struct sk_buff_head *head)
920 {
921 	spin_lock_bh(&head->lock);
922 	skb_queue_splice_tail(list, head);
923 	spin_unlock_bh(&head->lock);
924 }
925 
926 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
927  * @list: the new list to add. Lock protected. Will be reinitialized
928  * @head: target list. Lock protected.
929  */
930 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
931 						   struct sk_buff_head *head)
932 {
933 	struct sk_buff_head tmp;
934 
935 	__skb_queue_head_init(&tmp);
936 
937 	spin_lock_bh(&list->lock);
938 	skb_queue_splice_tail_init(list, &tmp);
939 	spin_unlock_bh(&list->lock);
940 	tipc_skb_queue_splice_tail(&tmp, head);
941 }
942 
943 #endif
944