xref: /linux/net/tipc/msg.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
1 /*
2  * net/tipc/msg.h: Include file for TIPC message header routines
3  *
4  * Copyright (c) 2000-2007, 2014-2017 Ericsson AB
5  * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the names of the copyright holders nor the names of its
17  *    contributors may be used to endorse or promote products derived from
18  *    this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34  * POSSIBILITY OF SUCH DAMAGE.
35  */
36 
37 #ifndef _TIPC_MSG_H
38 #define _TIPC_MSG_H
39 
40 #include <linux/tipc.h>
41 #include "core.h"
42 
43 /*
44  * Constants and routines used to read and write TIPC payload message headers
45  *
46  * Note: Some items are also used with TIPC internal message headers
47  */
48 #define TIPC_VERSION              2
49 struct plist;
50 
51 /*
52  * Payload message users are defined in TIPC's public API:
53  * - TIPC_LOW_IMPORTANCE
54  * - TIPC_MEDIUM_IMPORTANCE
55  * - TIPC_HIGH_IMPORTANCE
56  * - TIPC_CRITICAL_IMPORTANCE
57  */
58 #define TIPC_SYSTEM_IMPORTANCE	4
59 
60 
61 /*
62  * Payload message types
63  */
64 #define TIPC_CONN_MSG           0
65 #define TIPC_MCAST_MSG          1
66 #define TIPC_NAMED_MSG          2
67 #define TIPC_DIRECT_MSG         3
68 #define TIPC_GRP_MEMBER_EVT     4
69 #define TIPC_GRP_BCAST_MSG      5
70 #define TIPC_GRP_MCAST_MSG      6
71 #define TIPC_GRP_UCAST_MSG      7
72 
73 /*
74  * Internal message users
75  */
76 #define  BCAST_PROTOCOL       5
77 #define  MSG_BUNDLER          6
78 #define  LINK_PROTOCOL        7
79 #define  CONN_MANAGER         8
80 #define  GROUP_PROTOCOL       9
81 #define  TUNNEL_PROTOCOL      10
82 #define  NAME_DISTRIBUTOR     11
83 #define  MSG_FRAGMENTER       12
84 #define  LINK_CONFIG          13
85 #define  MSG_CRYPTO           14
86 #define  SOCK_WAKEUP          14       /* pseudo user */
87 #define  TOP_SRV              15       /* pseudo user */
88 
89 /*
90  * Message header sizes
91  */
92 #define SHORT_H_SIZE              24	/* In-cluster basic payload message */
93 #define BASIC_H_SIZE              32	/* Basic payload message */
94 #define NAMED_H_SIZE              40	/* Named payload message */
95 #define MCAST_H_SIZE              44	/* Multicast payload message */
96 #define GROUP_H_SIZE              44	/* Group payload message */
97 #define INT_H_SIZE                40	/* Internal messages */
98 #define MIN_H_SIZE                24	/* Smallest legal TIPC header size */
99 #define MAX_H_SIZE                60	/* Largest possible TIPC header size */
100 
101 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
102 #define TIPC_MEDIA_INFO_OFFSET	5
103 
104 extern const int one_page_mtu;
105 
106 struct tipc_skb_cb {
107 	union {
108 		struct {
109 			struct sk_buff *tail;
110 			unsigned long nxt_retr;
111 			unsigned long retr_stamp;
112 			u32 bytes_read;
113 			u32 orig_member;
114 			u16 chain_imp;
115 			u16 ackers;
116 			u16 retr_cnt;
117 		} __packed;
118 #ifdef CONFIG_TIPC_CRYPTO
119 		struct {
120 			struct tipc_crypto *rx;
121 			struct tipc_aead *last;
122 			u8 recurs;
123 		} tx_clone_ctx __packed;
124 #endif
125 	} __packed;
126 	union {
127 		struct {
128 			u8 validated:1;
129 #ifdef CONFIG_TIPC_CRYPTO
130 			u8 encrypted:1;
131 			u8 decrypted:1;
132 #define SKB_PROBING	1
133 #define SKB_GRACING	2
134 			u8 xmit_type:2;
135 			u8 tx_clone_deferred:1;
136 #endif
137 		};
138 		u8 flags;
139 	};
140 	u8 reserved;
141 #ifdef CONFIG_TIPC_CRYPTO
142 	void *crypto_ctx;
143 #endif
144 } __packed;
145 
146 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
147 
148 struct tipc_msg {
149 	__be32 hdr[15];
150 };
151 
152 /* struct tipc_gap_ack - TIPC Gap ACK block
153  * @ack: seqno of the last consecutive packet in link deferdq
154  * @gap: number of gap packets since the last ack
155  *
156  * E.g:
157  *       link deferdq: 1 2 3 4      10 11      13 14 15       20
158  * --> Gap ACK blocks:      <4, 5>,   <11, 1>,      <15, 4>, <20, 0>
159  */
160 struct tipc_gap_ack {
161 	__be16 ack;
162 	__be16 gap;
163 };
164 
165 /* struct tipc_gap_ack_blks
166  * @len: actual length of the record
167  * @ugack_cnt: number of Gap ACK blocks for unicast (following the broadcast
168  *             ones)
169  * @start_index: starting index for "valid" broadcast Gap ACK blocks
170  * @bgack_cnt: number of Gap ACK blocks for broadcast in the record
171  * @gacks: array of Gap ACK blocks
172  *
173  *  31                       16 15                        0
174  * +-------------+-------------+-------------+-------------+
175  * |  bgack_cnt  |  ugack_cnt  |            len            |
176  * +-------------+-------------+-------------+-------------+  -
177  * |            gap            |            ack            |   |
178  * +-------------+-------------+-------------+-------------+    > bc gacks
179  * :                           :                           :   |
180  * +-------------+-------------+-------------+-------------+  -
181  * |            gap            |            ack            |   |
182  * +-------------+-------------+-------------+-------------+    > uc gacks
183  * :                           :                           :   |
184  * +-------------+-------------+-------------+-------------+  -
185  */
186 struct tipc_gap_ack_blks {
187 	__be16 len;
188 	union {
189 		u8 ugack_cnt;
190 		u8 start_index;
191 	};
192 	u8 bgack_cnt;
193 	struct tipc_gap_ack gacks[];
194 };
195 
196 #define MAX_GAP_ACK_BLKS	128
197 #define MAX_GAP_ACK_BLKS_SZ	(sizeof(struct tipc_gap_ack_blks) + \
198 				 sizeof(struct tipc_gap_ack) * MAX_GAP_ACK_BLKS)
199 
buf_msg(struct sk_buff * skb)200 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
201 {
202 	return (struct tipc_msg *)skb->data;
203 }
204 
msg_word(struct tipc_msg * m,u32 pos)205 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
206 {
207 	return ntohl(m->hdr[pos]);
208 }
209 
msg_set_word(struct tipc_msg * m,u32 w,u32 val)210 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
211 {
212 	m->hdr[w] = htonl(val);
213 }
214 
msg_bits(struct tipc_msg * m,u32 w,u32 pos,u32 mask)215 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
216 {
217 	return (msg_word(m, w) >> pos) & mask;
218 }
219 
msg_set_bits(struct tipc_msg * m,u32 w,u32 pos,u32 mask,u32 val)220 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
221 				u32 pos, u32 mask, u32 val)
222 {
223 	val = (val & mask) << pos;
224 	mask = mask << pos;
225 	m->hdr[w] &= ~htonl(mask);
226 	m->hdr[w] |= htonl(val);
227 }
228 
229 /*
230  * Word 0
231  */
msg_version(struct tipc_msg * m)232 static inline u32 msg_version(struct tipc_msg *m)
233 {
234 	return msg_bits(m, 0, 29, 7);
235 }
236 
msg_set_version(struct tipc_msg * m)237 static inline void msg_set_version(struct tipc_msg *m)
238 {
239 	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
240 }
241 
msg_user(struct tipc_msg * m)242 static inline u32 msg_user(struct tipc_msg *m)
243 {
244 	return msg_bits(m, 0, 25, 0xf);
245 }
246 
msg_isdata(struct tipc_msg * m)247 static inline u32 msg_isdata(struct tipc_msg *m)
248 {
249 	return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
250 }
251 
msg_set_user(struct tipc_msg * m,u32 n)252 static inline void msg_set_user(struct tipc_msg *m, u32 n)
253 {
254 	msg_set_bits(m, 0, 25, 0xf, n);
255 }
256 
msg_hdr_sz(struct tipc_msg * m)257 static inline u32 msg_hdr_sz(struct tipc_msg *m)
258 {
259 	return msg_bits(m, 0, 21, 0xf) << 2;
260 }
261 
msg_set_hdr_sz(struct tipc_msg * m,u32 n)262 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
263 {
264 	msg_set_bits(m, 0, 21, 0xf, n>>2);
265 }
266 
msg_size(struct tipc_msg * m)267 static inline u32 msg_size(struct tipc_msg *m)
268 {
269 	return msg_bits(m, 0, 0, 0x1ffff);
270 }
271 
msg_blocks(struct tipc_msg * m)272 static inline u32 msg_blocks(struct tipc_msg *m)
273 {
274 	return (msg_size(m) / 1024) + 1;
275 }
276 
msg_data_sz(struct tipc_msg * m)277 static inline u32 msg_data_sz(struct tipc_msg *m)
278 {
279 	return msg_size(m) - msg_hdr_sz(m);
280 }
281 
msg_non_seq(struct tipc_msg * m)282 static inline int msg_non_seq(struct tipc_msg *m)
283 {
284 	return msg_bits(m, 0, 20, 1);
285 }
286 
msg_set_non_seq(struct tipc_msg * m,u32 n)287 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
288 {
289 	msg_set_bits(m, 0, 20, 1, n);
290 }
291 
msg_is_syn(struct tipc_msg * m)292 static inline int msg_is_syn(struct tipc_msg *m)
293 {
294 	return msg_bits(m, 0, 17, 1);
295 }
296 
msg_set_syn(struct tipc_msg * m,u32 d)297 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
298 {
299 	msg_set_bits(m, 0, 17, 1, d);
300 }
301 
msg_dest_droppable(struct tipc_msg * m)302 static inline int msg_dest_droppable(struct tipc_msg *m)
303 {
304 	return msg_bits(m, 0, 19, 1);
305 }
306 
msg_set_dest_droppable(struct tipc_msg * m,u32 d)307 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
308 {
309 	msg_set_bits(m, 0, 19, 1, d);
310 }
311 
msg_is_keepalive(struct tipc_msg * m)312 static inline int msg_is_keepalive(struct tipc_msg *m)
313 {
314 	return msg_bits(m, 0, 19, 1);
315 }
316 
msg_set_is_keepalive(struct tipc_msg * m,u32 d)317 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
318 {
319 	msg_set_bits(m, 0, 19, 1, d);
320 }
321 
msg_src_droppable(struct tipc_msg * m)322 static inline int msg_src_droppable(struct tipc_msg *m)
323 {
324 	return msg_bits(m, 0, 18, 1);
325 }
326 
msg_set_src_droppable(struct tipc_msg * m,u32 d)327 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
328 {
329 	msg_set_bits(m, 0, 18, 1, d);
330 }
331 
msg_ack_required(struct tipc_msg * m)332 static inline int msg_ack_required(struct tipc_msg *m)
333 {
334 	return msg_bits(m, 0, 18, 1);
335 }
336 
msg_set_ack_required(struct tipc_msg * m)337 static inline void msg_set_ack_required(struct tipc_msg *m)
338 {
339 	msg_set_bits(m, 0, 18, 1, 1);
340 }
341 
msg_nagle_ack(struct tipc_msg * m)342 static inline int msg_nagle_ack(struct tipc_msg *m)
343 {
344 	return msg_bits(m, 0, 18, 1);
345 }
346 
msg_set_nagle_ack(struct tipc_msg * m)347 static inline void msg_set_nagle_ack(struct tipc_msg *m)
348 {
349 	msg_set_bits(m, 0, 18, 1, 1);
350 }
351 
msg_is_rcast(struct tipc_msg * m)352 static inline bool msg_is_rcast(struct tipc_msg *m)
353 {
354 	return msg_bits(m, 0, 18, 0x1);
355 }
356 
msg_set_is_rcast(struct tipc_msg * m,bool d)357 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
358 {
359 	msg_set_bits(m, 0, 18, 0x1, d);
360 }
361 
msg_set_size(struct tipc_msg * m,u32 sz)362 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
363 {
364 	m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
365 }
366 
msg_data(struct tipc_msg * m)367 static inline unchar *msg_data(struct tipc_msg *m)
368 {
369 	return ((unchar *)m) + msg_hdr_sz(m);
370 }
371 
msg_inner_hdr(struct tipc_msg * m)372 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
373 {
374 	return (struct tipc_msg *)msg_data(m);
375 }
376 
377 /*
378  * Word 1
379  */
msg_type(struct tipc_msg * m)380 static inline u32 msg_type(struct tipc_msg *m)
381 {
382 	return msg_bits(m, 1, 29, 0x7);
383 }
384 
msg_set_type(struct tipc_msg * m,u32 n)385 static inline void msg_set_type(struct tipc_msg *m, u32 n)
386 {
387 	msg_set_bits(m, 1, 29, 0x7, n);
388 }
389 
msg_in_group(struct tipc_msg * m)390 static inline int msg_in_group(struct tipc_msg *m)
391 {
392 	int mtyp = msg_type(m);
393 
394 	return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
395 }
396 
msg_is_grp_evt(struct tipc_msg * m)397 static inline bool msg_is_grp_evt(struct tipc_msg *m)
398 {
399 	return msg_type(m) == TIPC_GRP_MEMBER_EVT;
400 }
401 
msg_named(struct tipc_msg * m)402 static inline u32 msg_named(struct tipc_msg *m)
403 {
404 	return msg_type(m) == TIPC_NAMED_MSG;
405 }
406 
msg_mcast(struct tipc_msg * m)407 static inline u32 msg_mcast(struct tipc_msg *m)
408 {
409 	int mtyp = msg_type(m);
410 
411 	return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
412 		(mtyp == TIPC_GRP_MCAST_MSG));
413 }
414 
msg_connected(struct tipc_msg * m)415 static inline u32 msg_connected(struct tipc_msg *m)
416 {
417 	return msg_type(m) == TIPC_CONN_MSG;
418 }
419 
msg_direct(struct tipc_msg * m)420 static inline u32 msg_direct(struct tipc_msg *m)
421 {
422 	return msg_type(m) == TIPC_DIRECT_MSG;
423 }
424 
msg_errcode(struct tipc_msg * m)425 static inline u32 msg_errcode(struct tipc_msg *m)
426 {
427 	return msg_bits(m, 1, 25, 0xf);
428 }
429 
msg_set_errcode(struct tipc_msg * m,u32 err)430 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
431 {
432 	msg_set_bits(m, 1, 25, 0xf, err);
433 }
434 
msg_set_bulk(struct tipc_msg * m)435 static inline void msg_set_bulk(struct tipc_msg *m)
436 {
437 	msg_set_bits(m, 1, 28, 0x1, 1);
438 }
439 
msg_is_bulk(struct tipc_msg * m)440 static inline u32 msg_is_bulk(struct tipc_msg *m)
441 {
442 	return msg_bits(m, 1, 28, 0x1);
443 }
444 
msg_set_last_bulk(struct tipc_msg * m)445 static inline void msg_set_last_bulk(struct tipc_msg *m)
446 {
447 	msg_set_bits(m, 1, 27, 0x1, 1);
448 }
449 
msg_is_last_bulk(struct tipc_msg * m)450 static inline u32 msg_is_last_bulk(struct tipc_msg *m)
451 {
452 	return msg_bits(m, 1, 27, 0x1);
453 }
454 
msg_set_non_legacy(struct tipc_msg * m)455 static inline void msg_set_non_legacy(struct tipc_msg *m)
456 {
457 	msg_set_bits(m, 1, 26, 0x1, 1);
458 }
459 
msg_is_legacy(struct tipc_msg * m)460 static inline u32 msg_is_legacy(struct tipc_msg *m)
461 {
462 	return !msg_bits(m, 1, 26, 0x1);
463 }
464 
msg_reroute_cnt(struct tipc_msg * m)465 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
466 {
467 	return msg_bits(m, 1, 21, 0xf);
468 }
469 
msg_incr_reroute_cnt(struct tipc_msg * m)470 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
471 {
472 	msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
473 }
474 
msg_lookup_scope(struct tipc_msg * m)475 static inline u32 msg_lookup_scope(struct tipc_msg *m)
476 {
477 	return msg_bits(m, 1, 19, 0x3);
478 }
479 
msg_set_lookup_scope(struct tipc_msg * m,u32 n)480 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
481 {
482 	msg_set_bits(m, 1, 19, 0x3, n);
483 }
484 
msg_bcast_ack(struct tipc_msg * m)485 static inline u16 msg_bcast_ack(struct tipc_msg *m)
486 {
487 	return msg_bits(m, 1, 0, 0xffff);
488 }
489 
msg_set_bcast_ack(struct tipc_msg * m,u16 n)490 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
491 {
492 	msg_set_bits(m, 1, 0, 0xffff, n);
493 }
494 
495 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
496  * link peer session number
497  */
msg_dest_session_valid(struct tipc_msg * m)498 static inline bool msg_dest_session_valid(struct tipc_msg *m)
499 {
500 	return msg_bits(m, 1, 16, 0x1);
501 }
502 
msg_set_dest_session_valid(struct tipc_msg * m,bool valid)503 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
504 {
505 	msg_set_bits(m, 1, 16, 0x1, valid);
506 }
507 
msg_dest_session(struct tipc_msg * m)508 static inline u16 msg_dest_session(struct tipc_msg *m)
509 {
510 	return msg_bits(m, 1, 0, 0xffff);
511 }
512 
msg_set_dest_session(struct tipc_msg * m,u16 n)513 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
514 {
515 	msg_set_bits(m, 1, 0, 0xffff, n);
516 }
517 
518 /*
519  * Word 2
520  */
msg_ack(struct tipc_msg * m)521 static inline u16 msg_ack(struct tipc_msg *m)
522 {
523 	return msg_bits(m, 2, 16, 0xffff);
524 }
525 
msg_set_ack(struct tipc_msg * m,u16 n)526 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
527 {
528 	msg_set_bits(m, 2, 16, 0xffff, n);
529 }
530 
msg_seqno(struct tipc_msg * m)531 static inline u16 msg_seqno(struct tipc_msg *m)
532 {
533 	return msg_bits(m, 2, 0, 0xffff);
534 }
535 
msg_set_seqno(struct tipc_msg * m,u16 n)536 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
537 {
538 	msg_set_bits(m, 2, 0, 0xffff, n);
539 }
540 
541 /*
542  * Words 3-10
543  */
msg_importance(struct tipc_msg * m)544 static inline u32 msg_importance(struct tipc_msg *m)
545 {
546 	int usr = msg_user(m);
547 
548 	if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
549 		return usr;
550 	if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
551 		return msg_bits(m, 9, 0, 0x7);
552 	return TIPC_SYSTEM_IMPORTANCE;
553 }
554 
msg_set_importance(struct tipc_msg * m,u32 i)555 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
556 {
557 	int usr = msg_user(m);
558 
559 	if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
560 		msg_set_bits(m, 9, 0, 0x7, i);
561 	else if (i < TIPC_SYSTEM_IMPORTANCE)
562 		msg_set_user(m, i);
563 	else
564 		pr_warn("Trying to set illegal importance in message\n");
565 }
566 
msg_prevnode(struct tipc_msg * m)567 static inline u32 msg_prevnode(struct tipc_msg *m)
568 {
569 	return msg_word(m, 3);
570 }
571 
msg_set_prevnode(struct tipc_msg * m,u32 a)572 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
573 {
574 	msg_set_word(m, 3, a);
575 }
576 
msg_origport(struct tipc_msg * m)577 static inline u32 msg_origport(struct tipc_msg *m)
578 {
579 	if (msg_user(m) == MSG_FRAGMENTER)
580 		m = msg_inner_hdr(m);
581 	return msg_word(m, 4);
582 }
583 
msg_set_origport(struct tipc_msg * m,u32 p)584 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
585 {
586 	msg_set_word(m, 4, p);
587 }
588 
msg_named_seqno(struct tipc_msg * m)589 static inline u16 msg_named_seqno(struct tipc_msg *m)
590 {
591 	return msg_bits(m, 4, 0, 0xffff);
592 }
593 
msg_set_named_seqno(struct tipc_msg * m,u16 n)594 static inline void msg_set_named_seqno(struct tipc_msg *m, u16 n)
595 {
596 	msg_set_bits(m, 4, 0, 0xffff, n);
597 }
598 
msg_destport(struct tipc_msg * m)599 static inline u32 msg_destport(struct tipc_msg *m)
600 {
601 	return msg_word(m, 5);
602 }
603 
msg_set_destport(struct tipc_msg * m,u32 p)604 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
605 {
606 	msg_set_word(m, 5, p);
607 }
608 
msg_mc_netid(struct tipc_msg * m)609 static inline u32 msg_mc_netid(struct tipc_msg *m)
610 {
611 	return msg_word(m, 5);
612 }
613 
msg_set_mc_netid(struct tipc_msg * m,u32 p)614 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
615 {
616 	msg_set_word(m, 5, p);
617 }
618 
msg_short(struct tipc_msg * m)619 static inline int msg_short(struct tipc_msg *m)
620 {
621 	return msg_hdr_sz(m) == SHORT_H_SIZE;
622 }
623 
msg_orignode(struct tipc_msg * m)624 static inline u32 msg_orignode(struct tipc_msg *m)
625 {
626 	if (likely(msg_short(m)))
627 		return msg_prevnode(m);
628 	return msg_word(m, 6);
629 }
630 
msg_set_orignode(struct tipc_msg * m,u32 a)631 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
632 {
633 	msg_set_word(m, 6, a);
634 }
635 
msg_destnode(struct tipc_msg * m)636 static inline u32 msg_destnode(struct tipc_msg *m)
637 {
638 	return msg_word(m, 7);
639 }
640 
msg_set_destnode(struct tipc_msg * m,u32 a)641 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
642 {
643 	msg_set_word(m, 7, a);
644 }
645 
msg_nametype(struct tipc_msg * m)646 static inline u32 msg_nametype(struct tipc_msg *m)
647 {
648 	return msg_word(m, 8);
649 }
650 
msg_set_nametype(struct tipc_msg * m,u32 n)651 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
652 {
653 	msg_set_word(m, 8, n);
654 }
655 
msg_nameinst(struct tipc_msg * m)656 static inline u32 msg_nameinst(struct tipc_msg *m)
657 {
658 	return msg_word(m, 9);
659 }
660 
msg_namelower(struct tipc_msg * m)661 static inline u32 msg_namelower(struct tipc_msg *m)
662 {
663 	return msg_nameinst(m);
664 }
665 
msg_set_namelower(struct tipc_msg * m,u32 n)666 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
667 {
668 	msg_set_word(m, 9, n);
669 }
670 
msg_set_nameinst(struct tipc_msg * m,u32 n)671 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
672 {
673 	msg_set_namelower(m, n);
674 }
675 
msg_nameupper(struct tipc_msg * m)676 static inline u32 msg_nameupper(struct tipc_msg *m)
677 {
678 	return msg_word(m, 10);
679 }
680 
msg_set_nameupper(struct tipc_msg * m,u32 n)681 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
682 {
683 	msg_set_word(m, 10, n);
684 }
685 
686 /*
687  * Constants and routines used to read and write TIPC internal message headers
688  */
689 
690 /*
691  *  Connection management protocol message types
692  */
693 #define CONN_PROBE        0
694 #define CONN_PROBE_REPLY  1
695 #define CONN_ACK          2
696 
697 /*
698  * Name distributor message types
699  */
700 #define PUBLICATION       0
701 #define WITHDRAWAL        1
702 
703 /*
704  * Segmentation message types
705  */
706 #define FIRST_FRAGMENT		0
707 #define FRAGMENT		1
708 #define LAST_FRAGMENT		2
709 
710 /*
711  * Link management protocol message types
712  */
713 #define STATE_MSG		0
714 #define RESET_MSG		1
715 #define ACTIVATE_MSG		2
716 
717 /*
718  * Changeover tunnel message types
719  */
720 #define SYNCH_MSG		0
721 #define FAILOVER_MSG		1
722 
723 /*
724  * Config protocol message types
725  */
726 #define DSC_REQ_MSG		0
727 #define DSC_RESP_MSG		1
728 #define DSC_TRIAL_MSG		2
729 #define DSC_TRIAL_FAIL_MSG	3
730 
731 /*
732  * Group protocol message types
733  */
734 #define GRP_JOIN_MSG         0
735 #define GRP_LEAVE_MSG        1
736 #define GRP_ADV_MSG          2
737 #define GRP_ACK_MSG          3
738 #define GRP_RECLAIM_MSG      4
739 #define GRP_REMIT_MSG        5
740 
741 /* Crypto message types */
742 #define KEY_DISTR_MSG		0
743 
744 /*
745  * Word 1
746  */
msg_seq_gap(struct tipc_msg * m)747 static inline u32 msg_seq_gap(struct tipc_msg *m)
748 {
749 	return msg_bits(m, 1, 16, 0x1fff);
750 }
751 
msg_set_seq_gap(struct tipc_msg * m,u32 n)752 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
753 {
754 	msg_set_bits(m, 1, 16, 0x1fff, n);
755 }
756 
msg_node_sig(struct tipc_msg * m)757 static inline u32 msg_node_sig(struct tipc_msg *m)
758 {
759 	return msg_bits(m, 1, 0, 0xffff);
760 }
761 
msg_set_node_sig(struct tipc_msg * m,u32 n)762 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
763 {
764 	msg_set_bits(m, 1, 0, 0xffff, n);
765 }
766 
msg_node_capabilities(struct tipc_msg * m)767 static inline u32 msg_node_capabilities(struct tipc_msg *m)
768 {
769 	return msg_bits(m, 1, 15, 0x1fff);
770 }
771 
msg_set_node_capabilities(struct tipc_msg * m,u32 n)772 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
773 {
774 	msg_set_bits(m, 1, 15, 0x1fff, n);
775 }
776 
777 /*
778  * Word 2
779  */
msg_dest_domain(struct tipc_msg * m)780 static inline u32 msg_dest_domain(struct tipc_msg *m)
781 {
782 	return msg_word(m, 2);
783 }
784 
msg_set_dest_domain(struct tipc_msg * m,u32 n)785 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
786 {
787 	msg_set_word(m, 2, n);
788 }
789 
msg_set_bcgap_after(struct tipc_msg * m,u32 n)790 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
791 {
792 	msg_set_bits(m, 2, 16, 0xffff, n);
793 }
794 
msg_bcgap_to(struct tipc_msg * m)795 static inline u32 msg_bcgap_to(struct tipc_msg *m)
796 {
797 	return msg_bits(m, 2, 0, 0xffff);
798 }
799 
msg_set_bcgap_to(struct tipc_msg * m,u32 n)800 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
801 {
802 	msg_set_bits(m, 2, 0, 0xffff, n);
803 }
804 
805 /*
806  * Word 4
807  */
msg_last_bcast(struct tipc_msg * m)808 static inline u32 msg_last_bcast(struct tipc_msg *m)
809 {
810 	return msg_bits(m, 4, 16, 0xffff);
811 }
812 
msg_bc_snd_nxt(struct tipc_msg * m)813 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
814 {
815 	return msg_last_bcast(m) + 1;
816 }
817 
msg_set_last_bcast(struct tipc_msg * m,u32 n)818 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
819 {
820 	msg_set_bits(m, 4, 16, 0xffff, n);
821 }
822 
msg_nof_fragms(struct tipc_msg * m)823 static inline u32 msg_nof_fragms(struct tipc_msg *m)
824 {
825 	return msg_bits(m, 4, 0, 0xffff);
826 }
827 
msg_set_nof_fragms(struct tipc_msg * m,u32 n)828 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
829 {
830 	msg_set_bits(m, 4, 0, 0xffff, n);
831 }
832 
msg_fragm_no(struct tipc_msg * m)833 static inline u32 msg_fragm_no(struct tipc_msg *m)
834 {
835 	return msg_bits(m, 4, 16, 0xffff);
836 }
837 
msg_set_fragm_no(struct tipc_msg * m,u32 n)838 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
839 {
840 	msg_set_bits(m, 4, 16, 0xffff, n);
841 }
842 
msg_next_sent(struct tipc_msg * m)843 static inline u16 msg_next_sent(struct tipc_msg *m)
844 {
845 	return msg_bits(m, 4, 0, 0xffff);
846 }
847 
msg_set_next_sent(struct tipc_msg * m,u16 n)848 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
849 {
850 	msg_set_bits(m, 4, 0, 0xffff, n);
851 }
852 
msg_bc_netid(struct tipc_msg * m)853 static inline u32 msg_bc_netid(struct tipc_msg *m)
854 {
855 	return msg_word(m, 4);
856 }
857 
msg_set_bc_netid(struct tipc_msg * m,u32 id)858 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
859 {
860 	msg_set_word(m, 4, id);
861 }
862 
msg_link_selector(struct tipc_msg * m)863 static inline u32 msg_link_selector(struct tipc_msg *m)
864 {
865 	if (msg_user(m) == MSG_FRAGMENTER)
866 		m = (void *)msg_data(m);
867 	return msg_bits(m, 4, 0, 1);
868 }
869 
870 /*
871  * Word 5
872  */
msg_session(struct tipc_msg * m)873 static inline u16 msg_session(struct tipc_msg *m)
874 {
875 	return msg_bits(m, 5, 16, 0xffff);
876 }
877 
msg_set_session(struct tipc_msg * m,u16 n)878 static inline void msg_set_session(struct tipc_msg *m, u16 n)
879 {
880 	msg_set_bits(m, 5, 16, 0xffff, n);
881 }
882 
msg_probe(struct tipc_msg * m)883 static inline u32 msg_probe(struct tipc_msg *m)
884 {
885 	return msg_bits(m, 5, 0, 1);
886 }
887 
msg_set_probe(struct tipc_msg * m,u32 val)888 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
889 {
890 	msg_set_bits(m, 5, 0, 1, val);
891 }
892 
msg_net_plane(struct tipc_msg * m)893 static inline char msg_net_plane(struct tipc_msg *m)
894 {
895 	return msg_bits(m, 5, 1, 7) + 'A';
896 }
897 
msg_set_net_plane(struct tipc_msg * m,char n)898 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
899 {
900 	msg_set_bits(m, 5, 1, 7, (n - 'A'));
901 }
902 
msg_linkprio(struct tipc_msg * m)903 static inline u32 msg_linkprio(struct tipc_msg *m)
904 {
905 	return msg_bits(m, 5, 4, 0x1f);
906 }
907 
msg_set_linkprio(struct tipc_msg * m,u32 n)908 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
909 {
910 	msg_set_bits(m, 5, 4, 0x1f, n);
911 }
912 
msg_bearer_id(struct tipc_msg * m)913 static inline u32 msg_bearer_id(struct tipc_msg *m)
914 {
915 	return msg_bits(m, 5, 9, 0x7);
916 }
917 
msg_set_bearer_id(struct tipc_msg * m,u32 n)918 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
919 {
920 	msg_set_bits(m, 5, 9, 0x7, n);
921 }
922 
msg_redundant_link(struct tipc_msg * m)923 static inline u32 msg_redundant_link(struct tipc_msg *m)
924 {
925 	return msg_bits(m, 5, 12, 0x1);
926 }
927 
msg_set_redundant_link(struct tipc_msg * m,u32 r)928 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
929 {
930 	msg_set_bits(m, 5, 12, 0x1, r);
931 }
932 
msg_peer_stopping(struct tipc_msg * m)933 static inline u32 msg_peer_stopping(struct tipc_msg *m)
934 {
935 	return msg_bits(m, 5, 13, 0x1);
936 }
937 
msg_set_peer_stopping(struct tipc_msg * m,u32 s)938 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
939 {
940 	msg_set_bits(m, 5, 13, 0x1, s);
941 }
942 
msg_bc_ack_invalid(struct tipc_msg * m)943 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
944 {
945 	switch (msg_user(m)) {
946 	case BCAST_PROTOCOL:
947 	case NAME_DISTRIBUTOR:
948 	case LINK_PROTOCOL:
949 		return msg_bits(m, 5, 14, 0x1);
950 	default:
951 		return false;
952 	}
953 }
954 
msg_set_bc_ack_invalid(struct tipc_msg * m,bool invalid)955 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
956 {
957 	msg_set_bits(m, 5, 14, 0x1, invalid);
958 }
959 
msg_media_addr(struct tipc_msg * m)960 static inline char *msg_media_addr(struct tipc_msg *m)
961 {
962 	return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
963 }
964 
msg_bc_gap(struct tipc_msg * m)965 static inline u32 msg_bc_gap(struct tipc_msg *m)
966 {
967 	return msg_bits(m, 8, 0, 0x3ff);
968 }
969 
msg_set_bc_gap(struct tipc_msg * m,u32 n)970 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
971 {
972 	msg_set_bits(m, 8, 0, 0x3ff, n);
973 }
974 
975 /*
976  * Word 9
977  */
msg_msgcnt(struct tipc_msg * m)978 static inline u16 msg_msgcnt(struct tipc_msg *m)
979 {
980 	return msg_bits(m, 9, 16, 0xffff);
981 }
982 
msg_set_msgcnt(struct tipc_msg * m,u16 n)983 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
984 {
985 	msg_set_bits(m, 9, 16, 0xffff, n);
986 }
987 
msg_syncpt(struct tipc_msg * m)988 static inline u16 msg_syncpt(struct tipc_msg *m)
989 {
990 	return msg_bits(m, 9, 16, 0xffff);
991 }
992 
msg_set_syncpt(struct tipc_msg * m,u16 n)993 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
994 {
995 	msg_set_bits(m, 9, 16, 0xffff, n);
996 }
997 
msg_conn_ack(struct tipc_msg * m)998 static inline u32 msg_conn_ack(struct tipc_msg *m)
999 {
1000 	return msg_bits(m, 9, 16, 0xffff);
1001 }
1002 
msg_set_conn_ack(struct tipc_msg * m,u32 n)1003 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
1004 {
1005 	msg_set_bits(m, 9, 16, 0xffff, n);
1006 }
1007 
msg_adv_win(struct tipc_msg * m)1008 static inline u16 msg_adv_win(struct tipc_msg *m)
1009 {
1010 	return msg_bits(m, 9, 0, 0xffff);
1011 }
1012 
msg_set_adv_win(struct tipc_msg * m,u16 n)1013 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
1014 {
1015 	msg_set_bits(m, 9, 0, 0xffff, n);
1016 }
1017 
msg_max_pkt(struct tipc_msg * m)1018 static inline u32 msg_max_pkt(struct tipc_msg *m)
1019 {
1020 	return msg_bits(m, 9, 16, 0xffff) * 4;
1021 }
1022 
msg_set_max_pkt(struct tipc_msg * m,u32 n)1023 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
1024 {
1025 	msg_set_bits(m, 9, 16, 0xffff, (n / 4));
1026 }
1027 
msg_link_tolerance(struct tipc_msg * m)1028 static inline u32 msg_link_tolerance(struct tipc_msg *m)
1029 {
1030 	return msg_bits(m, 9, 0, 0xffff);
1031 }
1032 
msg_set_link_tolerance(struct tipc_msg * m,u32 n)1033 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
1034 {
1035 	msg_set_bits(m, 9, 0, 0xffff, n);
1036 }
1037 
msg_grp_bc_syncpt(struct tipc_msg * m)1038 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
1039 {
1040 	return msg_bits(m, 9, 16, 0xffff);
1041 }
1042 
msg_set_grp_bc_syncpt(struct tipc_msg * m,u16 n)1043 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
1044 {
1045 	msg_set_bits(m, 9, 16, 0xffff, n);
1046 }
1047 
msg_grp_bc_acked(struct tipc_msg * m)1048 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
1049 {
1050 	return msg_bits(m, 9, 16, 0xffff);
1051 }
1052 
msg_set_grp_bc_acked(struct tipc_msg * m,u16 n)1053 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
1054 {
1055 	msg_set_bits(m, 9, 16, 0xffff, n);
1056 }
1057 
msg_grp_remitted(struct tipc_msg * m)1058 static inline u16 msg_grp_remitted(struct tipc_msg *m)
1059 {
1060 	return msg_bits(m, 9, 16, 0xffff);
1061 }
1062 
msg_set_grp_remitted(struct tipc_msg * m,u16 n)1063 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
1064 {
1065 	msg_set_bits(m, 9, 16, 0xffff, n);
1066 }
1067 
1068 /* Word 10
1069  */
msg_grp_evt(struct tipc_msg * m)1070 static inline u16 msg_grp_evt(struct tipc_msg *m)
1071 {
1072 	return msg_bits(m, 10, 0, 0x3);
1073 }
1074 
msg_set_grp_evt(struct tipc_msg * m,int n)1075 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
1076 {
1077 	msg_set_bits(m, 10, 0, 0x3, n);
1078 }
1079 
msg_grp_bc_ack_req(struct tipc_msg * m)1080 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
1081 {
1082 	return msg_bits(m, 10, 0, 0x1);
1083 }
1084 
msg_set_grp_bc_ack_req(struct tipc_msg * m,bool n)1085 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
1086 {
1087 	msg_set_bits(m, 10, 0, 0x1, n);
1088 }
1089 
msg_grp_bc_seqno(struct tipc_msg * m)1090 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
1091 {
1092 	return msg_bits(m, 10, 16, 0xffff);
1093 }
1094 
msg_set_grp_bc_seqno(struct tipc_msg * m,u32 n)1095 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
1096 {
1097 	msg_set_bits(m, 10, 16, 0xffff, n);
1098 }
1099 
msg_peer_link_is_up(struct tipc_msg * m)1100 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
1101 {
1102 	if (likely(msg_user(m) != LINK_PROTOCOL))
1103 		return true;
1104 	if (msg_type(m) == STATE_MSG)
1105 		return true;
1106 	return false;
1107 }
1108 
msg_peer_node_is_up(struct tipc_msg * m)1109 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
1110 {
1111 	if (msg_peer_link_is_up(m))
1112 		return true;
1113 	return msg_redundant_link(m);
1114 }
1115 
msg_is_reset(struct tipc_msg * hdr)1116 static inline bool msg_is_reset(struct tipc_msg *hdr)
1117 {
1118 	return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
1119 }
1120 
1121 /* Word 13
1122  */
msg_set_peer_net_hash(struct tipc_msg * m,u32 n)1123 static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n)
1124 {
1125 	msg_set_word(m, 13, n);
1126 }
1127 
msg_peer_net_hash(struct tipc_msg * m)1128 static inline u32 msg_peer_net_hash(struct tipc_msg *m)
1129 {
1130 	return msg_word(m, 13);
1131 }
1132 
1133 /* Word 14
1134  */
msg_sugg_node_addr(struct tipc_msg * m)1135 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
1136 {
1137 	return msg_word(m, 14);
1138 }
1139 
msg_set_sugg_node_addr(struct tipc_msg * m,u32 n)1140 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
1141 {
1142 	msg_set_word(m, 14, n);
1143 }
1144 
msg_set_node_id(struct tipc_msg * hdr,u8 * id)1145 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
1146 {
1147 	memcpy(msg_data(hdr), id, 16);
1148 }
1149 
msg_node_id(struct tipc_msg * hdr)1150 static inline u8 *msg_node_id(struct tipc_msg *hdr)
1151 {
1152 	return (u8 *)msg_data(hdr);
1153 }
1154 
1155 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
1156 bool tipc_msg_validate(struct sk_buff **_skb);
1157 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
1158 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
1159 		     struct sk_buff_head *xmitq);
1160 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
1161 		   u32 hsize, u32 destnode);
1162 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
1163 				uint data_sz, u32 dnode, u32 onode,
1164 				u32 dport, u32 oport, int errcode);
1165 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
1166 bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss,
1167 			 u32 dnode, bool *new_bundle);
1168 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
1169 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
1170 		      int pktmax, struct sk_buff_head *frags);
1171 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
1172 		   int offset, int dsz, int mtu, struct sk_buff_head *list);
1173 int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen,
1174 		    int mss, struct sk_buff_head *txq);
1175 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1176 bool tipc_msg_assemble(struct sk_buff_head *list);
1177 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1178 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1179 			struct sk_buff_head *cpy);
1180 bool __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1181 			     struct sk_buff *skb);
1182 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1183 
buf_seqno(struct sk_buff * skb)1184 static inline u16 buf_seqno(struct sk_buff *skb)
1185 {
1186 	return msg_seqno(buf_msg(skb));
1187 }
1188 
buf_roundup_len(struct sk_buff * skb)1189 static inline int buf_roundup_len(struct sk_buff *skb)
1190 {
1191 	return (skb->len / 1024 + 1) * 1024;
1192 }
1193 
1194 /* tipc_skb_peek(): peek and reserve first buffer in list
1195  * @list: list to be peeked in
1196  * Returns pointer to first buffer in list, if any
1197  */
tipc_skb_peek(struct sk_buff_head * list,spinlock_t * lock)1198 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1199 					    spinlock_t *lock)
1200 {
1201 	struct sk_buff *skb;
1202 
1203 	spin_lock_bh(lock);
1204 	skb = skb_peek(list);
1205 	if (skb)
1206 		skb_get(skb);
1207 	spin_unlock_bh(lock);
1208 	return skb;
1209 }
1210 
1211 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1212  *                       up to and including 'filter'.
1213  * Note: ignoring previously tried destinations minimizes the risk of
1214  *       contention on the socket lock
1215  * @list: list to be peeked in
1216  * @filter: last destination to be ignored from search
1217  * Returns a destination port number, of applicable.
1218  */
tipc_skb_peek_port(struct sk_buff_head * list,u32 filter)1219 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1220 {
1221 	struct sk_buff *skb;
1222 	u32 dport = 0;
1223 	bool ignore = true;
1224 
1225 	spin_lock_bh(&list->lock);
1226 	skb_queue_walk(list, skb) {
1227 		dport = msg_destport(buf_msg(skb));
1228 		if (!filter || skb_queue_is_last(list, skb))
1229 			break;
1230 		if (dport == filter)
1231 			ignore = false;
1232 		else if (!ignore)
1233 			break;
1234 	}
1235 	spin_unlock_bh(&list->lock);
1236 	return dport;
1237 }
1238 
1239 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1240  * @list: list to be unlinked from
1241  * @dport: selection criteria for buffer to unlink
1242  */
tipc_skb_dequeue(struct sk_buff_head * list,u32 dport)1243 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1244 					       u32 dport)
1245 {
1246 	struct sk_buff *_skb, *tmp, *skb = NULL;
1247 
1248 	spin_lock_bh(&list->lock);
1249 	skb_queue_walk_safe(list, _skb, tmp) {
1250 		if (msg_destport(buf_msg(_skb)) == dport) {
1251 			__skb_unlink(_skb, list);
1252 			skb = _skb;
1253 			break;
1254 		}
1255 	}
1256 	spin_unlock_bh(&list->lock);
1257 	return skb;
1258 }
1259 
1260 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1261  * @list: the new list to append. Not lock protected
1262  * @head: target list. Lock protected.
1263  */
tipc_skb_queue_splice_tail(struct sk_buff_head * list,struct sk_buff_head * head)1264 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1265 					      struct sk_buff_head *head)
1266 {
1267 	spin_lock_bh(&head->lock);
1268 	skb_queue_splice_tail(list, head);
1269 	spin_unlock_bh(&head->lock);
1270 }
1271 
1272 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1273  * @list: the new list to add. Lock protected. Will be reinitialized
1274  * @head: target list. Lock protected.
1275  */
tipc_skb_queue_splice_tail_init(struct sk_buff_head * list,struct sk_buff_head * head)1276 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1277 						   struct sk_buff_head *head)
1278 {
1279 	struct sk_buff_head tmp;
1280 
1281 	__skb_queue_head_init(&tmp);
1282 
1283 	spin_lock_bh(&list->lock);
1284 	skb_queue_splice_tail_init(list, &tmp);
1285 	spin_unlock_bh(&list->lock);
1286 	tipc_skb_queue_splice_tail(&tmp, head);
1287 }
1288 
1289 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
1290  * @list: list to be dequeued from
1291  * @seqno: seqno of the expected msg
1292  *
1293  * returns skb dequeued from the list if its seqno is less than or equal to
1294  * the expected one, otherwise the skb is still hold
1295  *
1296  * Note: must be used with appropriate locks held only
1297  */
__tipc_skb_dequeue(struct sk_buff_head * list,u16 seqno)1298 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
1299 						 u16 seqno)
1300 {
1301 	struct sk_buff *skb = skb_peek(list);
1302 
1303 	if (skb && less_eq(buf_seqno(skb), seqno)) {
1304 		__skb_unlink(skb, list);
1305 		return skb;
1306 	}
1307 	return NULL;
1308 }
1309 
1310 #endif
1311