2 * net/tipc/msg.h: Include file for TIPC message header routines
4 * Copyright (c) 2000-2007, Ericsson AB
5 * Copyright (c) 2005-2007, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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
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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.
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.
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
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34 * POSSIBILITY OF SUCH DAMAGE.
42 #define TIPC_VERSION 2
44 #define SHORT_H_SIZE 24 /* Connected, in-cluster messages */
45 #define DIR_MSG_H_SIZE 32 /* Directly addressed messages */
46 #define LONG_H_SIZE 40 /* Named messages */
47 #define MCAST_H_SIZE 44 /* Multicast messages */
48 #define INT_H_SIZE 40 /* Internal messages */
49 #define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
50 #define MAX_H_SIZE 60 /* Largest possible TIPC header size */
52 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
56 TIPC user data message header format, version 2
58 - Fundamental definitions available to privileged TIPC users
59 are located in tipc_msg.h.
60 - Remaining definitions available to TIPC internal users appear below.
64 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
66 m->hdr[w] = htonl(val);
69 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
70 u32 pos, u32 mask, u32 val)
72 val = (val & mask) << pos;
74 m->hdr[w] &= ~htonl(mask);
75 m->hdr[w] |= htonl(val);
82 static inline u32 msg_version(struct tipc_msg *m)
84 return msg_bits(m, 0, 29, 7);
87 static inline void msg_set_version(struct tipc_msg *m)
89 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
92 static inline u32 msg_user(struct tipc_msg *m)
94 return msg_bits(m, 0, 25, 0xf);
97 static inline u32 msg_isdata(struct tipc_msg *m)
99 return (msg_user(m) <= TIPC_CRITICAL_IMPORTANCE);
102 static inline void msg_set_user(struct tipc_msg *m, u32 n)
104 msg_set_bits(m, 0, 25, 0xf, n);
107 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
112 static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
114 msg_set_bits(m, 0, 21, 0xf, n>>2);
117 static inline int msg_non_seq(struct tipc_msg *m)
119 return msg_bits(m, 0, 20, 1);
122 static inline void msg_set_non_seq(struct tipc_msg *m)
124 msg_set_bits(m, 0, 20, 1, 1);
127 static inline int msg_dest_droppable(struct tipc_msg *m)
129 return msg_bits(m, 0, 19, 1);
132 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
134 msg_set_bits(m, 0, 19, 1, d);
137 static inline int msg_src_droppable(struct tipc_msg *m)
139 return msg_bits(m, 0, 18, 1);
142 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
144 msg_set_bits(m, 0, 18, 1, d);
147 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
149 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
157 static inline void msg_set_type(struct tipc_msg *m, u32 n)
159 msg_set_bits(m, 1, 29, 0x7, n);
162 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
164 msg_set_bits(m, 1, 25, 0xf, err);
167 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
169 return msg_bits(m, 1, 21, 0xf);
172 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
174 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
177 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
179 msg_set_bits(m, 1, 21, 0xf, 0);
182 static inline u32 msg_lookup_scope(struct tipc_msg *m)
184 return msg_bits(m, 1, 19, 0x3);
187 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
189 msg_set_bits(m, 1, 19, 0x3, n);
192 static inline u32 msg_bcast_ack(struct tipc_msg *m)
194 return msg_bits(m, 1, 0, 0xffff);
197 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
199 msg_set_bits(m, 1, 0, 0xffff, n);
207 static inline u32 msg_ack(struct tipc_msg *m)
209 return msg_bits(m, 2, 16, 0xffff);
212 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
214 msg_set_bits(m, 2, 16, 0xffff, n);
217 static inline u32 msg_seqno(struct tipc_msg *m)
219 return msg_bits(m, 2, 0, 0xffff);
222 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
224 msg_set_bits(m, 2, 0, 0xffff, n);
233 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
235 msg_set_word(m, 3, a);
238 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
240 msg_set_word(m, 4, p);
243 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
245 msg_set_word(m, 5, p);
248 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
250 msg_set_word(m, 5, p);
253 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
255 msg_set_word(m, 6, a);
258 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
260 msg_set_word(m, 7, a);
263 static inline int msg_is_dest(struct tipc_msg *m, u32 d)
265 return(msg_short(m) || (msg_destnode(m) == d));
268 static inline u32 msg_routed(struct tipc_msg *m)
270 if (likely(msg_short(m)))
272 return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
275 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
277 msg_set_word(m, 8, n);
280 static inline u32 msg_transp_seqno(struct tipc_msg *m)
282 return msg_word(m, 8);
285 static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
287 msg_set_word(m, 8, n);
290 static inline u32 msg_timestamp(struct tipc_msg *m)
292 return msg_word(m, 8);
295 static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
297 msg_set_word(m, 8, n);
300 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
302 msg_set_word(m, 9, n);
305 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
307 msg_set_namelower(m, n);
310 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
312 msg_set_word(m, 10, n);
315 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
317 return (struct tipc_msg *)msg_data(m);
322 TIPC internal message header format, version 2
324 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
325 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
326 w0:|vers |msg usr|hdr sz |n|resrv| packet size |
327 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
328 w1:|m typ|rsv=0| sequence gap | broadcast ack no |
329 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
330 w2:| link level ack no/bc_gap_from | seq no / bcast_gap_to |
331 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
333 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
334 w4:| next sent broadcast/fragm no | next sent pkt/ fragm msg no |
335 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
336 w5:| session no |rsv=0|r|berid|link prio|netpl|p|
337 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
338 w6:| originating node |
339 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
340 w7:| destination node |
341 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
342 w8:| transport sequence number |
343 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
344 w9:| msg count / bcast tag | link tolerance |
345 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
347 / User Specific Data /
349 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
351 NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
358 #define BCAST_PROTOCOL 5
359 #define MSG_BUNDLER 6
360 #define LINK_PROTOCOL 7
361 #define CONN_MANAGER 8
362 #define ROUTE_DISTRIBUTOR 9
363 #define CHANGEOVER_PROTOCOL 10
364 #define NAME_DISTRIBUTOR 11
365 #define MSG_FRAGMENTER 12
366 #define LINK_CONFIG 13
367 #define DSC_H_SIZE 40
370 * Connection management protocol messages
374 #define CONN_PROBE_REPLY 1
378 * Name distributor messages
381 #define PUBLICATION 0
389 static inline u32 msg_seq_gap(struct tipc_msg *m)
391 return msg_bits(m, 1, 16, 0xff);
394 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
396 msg_set_bits(m, 1, 16, 0xff, n);
399 static inline u32 msg_req_links(struct tipc_msg *m)
401 return msg_bits(m, 1, 16, 0xfff);
404 static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
406 msg_set_bits(m, 1, 16, 0xfff, n);
414 static inline u32 msg_dest_domain(struct tipc_msg *m)
416 return msg_word(m, 2);
419 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
421 msg_set_word(m, 2, n);
424 static inline u32 msg_bcgap_after(struct tipc_msg *m)
426 return msg_bits(m, 2, 16, 0xffff);
429 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
431 msg_set_bits(m, 2, 16, 0xffff, n);
434 static inline u32 msg_bcgap_to(struct tipc_msg *m)
436 return msg_bits(m, 2, 0, 0xffff);
439 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
441 msg_set_bits(m, 2, 0, 0xffff, n);
449 static inline u32 msg_last_bcast(struct tipc_msg *m)
451 return msg_bits(m, 4, 16, 0xffff);
454 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
456 msg_set_bits(m, 4, 16, 0xffff, n);
460 static inline u32 msg_fragm_no(struct tipc_msg *m)
462 return msg_bits(m, 4, 16, 0xffff);
465 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
467 msg_set_bits(m, 4, 16, 0xffff, n);
471 static inline u32 msg_next_sent(struct tipc_msg *m)
473 return msg_bits(m, 4, 0, 0xffff);
476 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
478 msg_set_bits(m, 4, 0, 0xffff, n);
482 static inline u32 msg_long_msgno(struct tipc_msg *m)
484 return msg_bits(m, 4, 0, 0xffff);
487 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
489 msg_set_bits(m, 4, 0, 0xffff, n);
492 static inline u32 msg_bc_netid(struct tipc_msg *m)
494 return msg_word(m, 4);
497 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
499 msg_set_word(m, 4, id);
502 static inline u32 msg_link_selector(struct tipc_msg *m)
504 return msg_bits(m, 4, 0, 1);
507 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
509 msg_set_bits(m, 4, 0, 1, (n & 1));
516 static inline u32 msg_session(struct tipc_msg *m)
518 return msg_bits(m, 5, 16, 0xffff);
521 static inline void msg_set_session(struct tipc_msg *m, u32 n)
523 msg_set_bits(m, 5, 16, 0xffff, n);
526 static inline u32 msg_probe(struct tipc_msg *m)
528 return msg_bits(m, 5, 0, 1);
531 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
533 msg_set_bits(m, 5, 0, 1, (val & 1));
536 static inline char msg_net_plane(struct tipc_msg *m)
538 return msg_bits(m, 5, 1, 7) + 'A';
541 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
543 msg_set_bits(m, 5, 1, 7, (n - 'A'));
546 static inline u32 msg_linkprio(struct tipc_msg *m)
548 return msg_bits(m, 5, 4, 0x1f);
551 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
553 msg_set_bits(m, 5, 4, 0x1f, n);
556 static inline u32 msg_bearer_id(struct tipc_msg *m)
558 return msg_bits(m, 5, 9, 0x7);
561 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
563 msg_set_bits(m, 5, 9, 0x7, n);
566 static inline u32 msg_redundant_link(struct tipc_msg *m)
568 return msg_bits(m, 5, 12, 0x1);
571 static inline void msg_set_redundant_link(struct tipc_msg *m)
573 msg_set_bits(m, 5, 12, 0x1, 1);
576 static inline void msg_clear_redundant_link(struct tipc_msg *m)
578 msg_set_bits(m, 5, 12, 0x1, 0);
586 static inline u32 msg_msgcnt(struct tipc_msg *m)
588 return msg_bits(m, 9, 16, 0xffff);
591 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
593 msg_set_bits(m, 9, 16, 0xffff, n);
596 static inline u32 msg_bcast_tag(struct tipc_msg *m)
598 return msg_bits(m, 9, 16, 0xffff);
601 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
603 msg_set_bits(m, 9, 16, 0xffff, n);
606 static inline u32 msg_max_pkt(struct tipc_msg *m)
608 return (msg_bits(m, 9, 16, 0xffff) * 4);
611 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
613 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
616 static inline u32 msg_link_tolerance(struct tipc_msg *m)
618 return msg_bits(m, 9, 0, 0xffff);
621 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
623 msg_set_bits(m, 9, 0, 0xffff, n);
627 * Routing table message data
631 static inline u32 msg_remote_node(struct tipc_msg *m)
633 return msg_word(m, msg_hdr_sz(m)/4);
636 static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
638 msg_set_word(m, msg_hdr_sz(m)/4, a);
641 static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
643 msg_data(m)[pos + 4] = 1;
647 * Segmentation message types
650 #define FIRST_FRAGMENT 0
652 #define LAST_FRAGMENT 2
655 * Link management protocol message types
660 #define ACTIVATE_MSG 2
663 * Changeover tunnel message types
665 #define DUPLICATE_MSG 0
666 #define ORIGINAL_MSG 1
669 * Routing table message types
671 #define EXT_ROUTING_TABLE 0
672 #define LOCAL_ROUTING_TABLE 1
673 #define SLAVE_ROUTING_TABLE 2
674 #define ROUTE_ADDITION 3
675 #define ROUTE_REMOVAL 4
678 * Config protocol message types
681 #define DSC_REQ_MSG 0
682 #define DSC_RESP_MSG 1
684 static inline u32 msg_tot_importance(struct tipc_msg *m)
686 if (likely(msg_isdata(m))) {
687 if (likely(msg_orignode(m) == tipc_own_addr))
688 return msg_importance(m);
689 return msg_importance(m) + 4;
691 if ((msg_user(m) == MSG_FRAGMENTER) &&
692 (msg_type(m) == FIRST_FRAGMENT))
693 return msg_importance(msg_get_wrapped(m));
694 return msg_importance(m);
698 static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
699 u32 err, u32 hsize, u32 destnode)
703 msg_set_user(m, user);
704 msg_set_hdr_sz(m, hsize);
705 msg_set_size(m, hsize);
706 msg_set_prevnode(m, tipc_own_addr);
707 msg_set_type(m, type);
708 msg_set_errcode(m, err);
710 msg_set_orignode(m, tipc_own_addr);
711 msg_set_destnode(m, destnode);
716 * msg_calc_data_size - determine total data size for message
719 static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
724 for (i = 0; i < num_sect; i++)
725 dsz += msg_sect[i].iov_len;
730 * msg_build - create message using specified header and data
732 * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
734 * Returns message data size or errno
737 static inline int msg_build(struct tipc_msg *hdr,
738 struct iovec const *msg_sect, u32 num_sect,
739 int max_size, int usrmem, struct sk_buff** buf)
741 int dsz, sz, hsz, pos, res, cnt;
743 dsz = msg_calc_data_size(msg_sect, num_sect);
744 if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
749 pos = hsz = msg_hdr_sz(hdr);
751 msg_set_size(hdr, sz);
752 if (unlikely(sz > max_size)) {
757 *buf = buf_acquire(sz);
760 skb_copy_to_linear_data(*buf, hdr, hsz);
761 for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
763 res = !copy_from_user((*buf)->data + pos,
764 msg_sect[cnt].iov_base,
765 msg_sect[cnt].iov_len);
767 skb_copy_to_linear_data_offset(*buf, pos,
768 msg_sect[cnt].iov_base,
769 msg_sect[cnt].iov_len);
770 pos += msg_sect[cnt].iov_len;
780 static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
782 memcpy(&((int *)m)[5], a, sizeof(*a));
785 static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
787 memcpy(a, &((int*)m)[5], sizeof(*a));