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1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, Ericsson AB
5 * Copyright (c) 2004-2006, 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#include "core.h"
38#include "config.h"
39#include "bearer.h"
40#include "discover.h"
41
42#define MAX_ADDR_STR 32
43
44static struct media media_list[MAX_MEDIA];
45static u32 media_count;
46
47struct tipc_bearer tipc_bearers[MAX_BEARERS];
48
49static void bearer_disable(struct tipc_bearer *b_ptr);
50
51/**
52 * media_name_valid - validate media name
53 *
54 * Returns 1 if media name is valid, otherwise 0.
55 */
56
57static int media_name_valid(const char *name)
58{
59 u32 len;
60
61 len = strlen(name);
62 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
63 return 0;
64 return strspn(name, tipc_alphabet) == len;
65}
66
67/**
68 * media_find - locates specified media object by name
69 */
70
71static struct media *media_find(const char *name)
72{
73 struct media *m_ptr;
74 u32 i;
75
76 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
77 if (!strcmp(m_ptr->name, name))
78 return m_ptr;
79 }
80 return NULL;
81}
82
83/**
84 * tipc_register_media - register a media type
85 *
86 * Bearers for this media type must be activated separately at a later stage.
87 */
88
89int tipc_register_media(u32 media_type,
90 char *name,
91 int (*enable)(struct tipc_bearer *),
92 void (*disable)(struct tipc_bearer *),
93 int (*send_msg)(struct sk_buff *,
94 struct tipc_bearer *,
95 struct tipc_media_addr *),
96 char *(*addr2str)(struct tipc_media_addr *a,
97 char *str_buf, int str_size),
98 struct tipc_media_addr *bcast_addr,
99 const u32 bearer_priority,
100 const u32 link_tolerance, /* [ms] */
101 const u32 send_window_limit)
102{
103 struct media *m_ptr;
104 u32 media_id;
105 u32 i;
106 int res = -EINVAL;
107
108 write_lock_bh(&tipc_net_lock);
109
110 if (tipc_mode != TIPC_NET_MODE) {
111 warn("Media <%s> rejected, not in networked mode yet\n", name);
112 goto exit;
113 }
114 if (!media_name_valid(name)) {
115 warn("Media <%s> rejected, illegal name\n", name);
116 goto exit;
117 }
118 if (!bcast_addr) {
119 warn("Media <%s> rejected, no broadcast address\n", name);
120 goto exit;
121 }
122 if ((bearer_priority < TIPC_MIN_LINK_PRI) ||
123 (bearer_priority > TIPC_MAX_LINK_PRI)) {
124 warn("Media <%s> rejected, illegal priority (%u)\n", name,
125 bearer_priority);
126 goto exit;
127 }
128 if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
129 (link_tolerance > TIPC_MAX_LINK_TOL)) {
130 warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
131 link_tolerance);
132 goto exit;
133 }
134
135 media_id = media_count++;
136 if (media_id >= MAX_MEDIA) {
137 warn("Media <%s> rejected, media limit reached (%u)\n", name,
138 MAX_MEDIA);
139 media_count--;
140 goto exit;
141 }
142 for (i = 0; i < media_id; i++) {
143 if (media_list[i].type_id == media_type) {
144 warn("Media <%s> rejected, duplicate type (%u)\n", name,
145 media_type);
146 media_count--;
147 goto exit;
148 }
149 if (!strcmp(name, media_list[i].name)) {
150 warn("Media <%s> rejected, duplicate name\n", name);
151 media_count--;
152 goto exit;
153 }
154 }
155
156 m_ptr = &media_list[media_id];
157 m_ptr->type_id = media_type;
158 m_ptr->send_msg = send_msg;
159 m_ptr->enable_bearer = enable;
160 m_ptr->disable_bearer = disable;
161 m_ptr->addr2str = addr2str;
162 memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
163 strcpy(m_ptr->name, name);
164 m_ptr->priority = bearer_priority;
165 m_ptr->tolerance = link_tolerance;
166 m_ptr->window = send_window_limit;
167 res = 0;
168exit:
169 write_unlock_bh(&tipc_net_lock);
170 return res;
171}
172
173/**
174 * tipc_media_addr_printf - record media address in print buffer
175 */
176
177void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
178{
179 struct media *m_ptr;
180 u32 media_type;
181 u32 i;
182
183 media_type = ntohl(a->type);
184 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
185 if (m_ptr->type_id == media_type)
186 break;
187 }
188
189 if ((i < media_count) && (m_ptr->addr2str != NULL)) {
190 char addr_str[MAX_ADDR_STR];
191
192 tipc_printf(pb, "%s(%s)", m_ptr->name,
193 m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
194 } else {
195 unchar *addr = (unchar *)&a->dev_addr;
196
197 tipc_printf(pb, "UNKNOWN(%u)", media_type);
198 for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++)
199 tipc_printf(pb, "-%02x", addr[i]);
200 }
201}
202
203/**
204 * tipc_media_get_names - record names of registered media in buffer
205 */
206
207struct sk_buff *tipc_media_get_names(void)
208{
209 struct sk_buff *buf;
210 struct media *m_ptr;
211 int i;
212
213 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
214 if (!buf)
215 return NULL;
216
217 read_lock_bh(&tipc_net_lock);
218 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
219 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
220 strlen(m_ptr->name) + 1);
221 }
222 read_unlock_bh(&tipc_net_lock);
223 return buf;
224}
225
226/**
227 * bearer_name_validate - validate & (optionally) deconstruct bearer name
228 * @name - ptr to bearer name string
229 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
230 *
231 * Returns 1 if bearer name is valid, otherwise 0.
232 */
233
234static int bearer_name_validate(const char *name,
235 struct bearer_name *name_parts)
236{
237 char name_copy[TIPC_MAX_BEARER_NAME];
238 char *media_name;
239 char *if_name;
240 u32 media_len;
241 u32 if_len;
242
243 /* copy bearer name & ensure length is OK */
244
245 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
246 /* need above in case non-Posix strncpy() doesn't pad with nulls */
247 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
248 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
249 return 0;
250
251 /* ensure all component parts of bearer name are present */
252
253 media_name = name_copy;
254 if_name = strchr(media_name, ':');
255 if (if_name == NULL)
256 return 0;
257 *(if_name++) = 0;
258 media_len = if_name - media_name;
259 if_len = strlen(if_name) + 1;
260
261 /* validate component parts of bearer name */
262
263 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
264 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
265 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
266 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
267 return 0;
268
269 /* return bearer name components, if necessary */
270
271 if (name_parts) {
272 strcpy(name_parts->media_name, media_name);
273 strcpy(name_parts->if_name, if_name);
274 }
275 return 1;
276}
277
278/**
279 * bearer_find - locates bearer object with matching bearer name
280 */
281
282static struct tipc_bearer *bearer_find(const char *name)
283{
284 struct tipc_bearer *b_ptr;
285 u32 i;
286
287 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
288 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
289 return b_ptr;
290 }
291 return NULL;
292}
293
294/**
295 * tipc_bearer_find_interface - locates bearer object with matching interface name
296 */
297
298struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
299{
300 struct tipc_bearer *b_ptr;
301 char *b_if_name;
302 u32 i;
303
304 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
305 if (!b_ptr->active)
306 continue;
307 b_if_name = strchr(b_ptr->name, ':') + 1;
308 if (!strcmp(b_if_name, if_name))
309 return b_ptr;
310 }
311 return NULL;
312}
313
314/**
315 * tipc_bearer_get_names - record names of bearers in buffer
316 */
317
318struct sk_buff *tipc_bearer_get_names(void)
319{
320 struct sk_buff *buf;
321 struct media *m_ptr;
322 struct tipc_bearer *b_ptr;
323 int i, j;
324
325 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
326 if (!buf)
327 return NULL;
328
329 read_lock_bh(&tipc_net_lock);
330 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
331 for (j = 0; j < MAX_BEARERS; j++) {
332 b_ptr = &tipc_bearers[j];
333 if (b_ptr->active && (b_ptr->media == m_ptr)) {
334 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
335 b_ptr->name,
336 strlen(b_ptr->name) + 1);
337 }
338 }
339 }
340 read_unlock_bh(&tipc_net_lock);
341 return buf;
342}
343
344void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
345{
346 tipc_nmap_add(&b_ptr->nodes, dest);
347 tipc_bcbearer_sort();
348 tipc_disc_add_dest(b_ptr->link_req);
349}
350
351void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
352{
353 tipc_nmap_remove(&b_ptr->nodes, dest);
354 tipc_bcbearer_sort();
355 tipc_disc_remove_dest(b_ptr->link_req);
356}
357
358/*
359 * bearer_push(): Resolve bearer congestion. Force the waiting
360 * links to push out their unsent packets, one packet per link
361 * per iteration, until all packets are gone or congestion reoccurs.
362 * 'tipc_net_lock' is read_locked when this function is called
363 * bearer.lock must be taken before calling
364 * Returns binary true(1) ore false(0)
365 */
366static int bearer_push(struct tipc_bearer *b_ptr)
367{
368 u32 res = 0;
369 struct link *ln, *tln;
370
371 if (b_ptr->blocked)
372 return 0;
373
374 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
375 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
376 res = tipc_link_push_packet(ln);
377 if (res == PUSH_FAILED)
378 break;
379 if (res == PUSH_FINISHED)
380 list_move_tail(&ln->link_list, &b_ptr->links);
381 }
382 }
383 return list_empty(&b_ptr->cong_links);
384}
385
386void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
387{
388 int res;
389
390 spin_lock_bh(&b_ptr->lock);
391 res = bearer_push(b_ptr);
392 spin_unlock_bh(&b_ptr->lock);
393 if (res)
394 tipc_bcbearer_push();
395}
396
397
398/*
399 * Interrupt enabling new requests after bearer congestion or blocking:
400 * See bearer_send().
401 */
402void tipc_continue(struct tipc_bearer *b_ptr)
403{
404 spin_lock_bh(&b_ptr->lock);
405 if (!list_empty(&b_ptr->cong_links))
406 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
407 b_ptr->blocked = 0;
408 spin_unlock_bh(&b_ptr->lock);
409}
410
411/*
412 * Schedule link for sending of messages after the bearer
413 * has been deblocked by 'continue()'. This method is called
414 * when somebody tries to send a message via this link while
415 * the bearer is congested. 'tipc_net_lock' is in read_lock here
416 * bearer.lock is busy
417 */
418
419static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, struct link *l_ptr)
420{
421 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
422}
423
424/*
425 * Schedule link for sending of messages after the bearer
426 * has been deblocked by 'continue()'. This method is called
427 * when somebody tries to send a message via this link while
428 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
429 * bearer.lock is free
430 */
431
432void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr)
433{
434 spin_lock_bh(&b_ptr->lock);
435 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
436 spin_unlock_bh(&b_ptr->lock);
437}
438
439
440/*
441 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
442 * and if there is, try to resolve it before returning.
443 * 'tipc_net_lock' is read_locked when this function is called
444 */
445int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr)
446{
447 int res = 1;
448
449 if (list_empty(&b_ptr->cong_links))
450 return 1;
451 spin_lock_bh(&b_ptr->lock);
452 if (!bearer_push(b_ptr)) {
453 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
454 res = 0;
455 }
456 spin_unlock_bh(&b_ptr->lock);
457 return res;
458}
459
460/**
461 * tipc_bearer_congested - determines if bearer is currently congested
462 */
463
464int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr)
465{
466 if (unlikely(b_ptr->blocked))
467 return 1;
468 if (likely(list_empty(&b_ptr->cong_links)))
469 return 0;
470 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
471}
472
473/**
474 * tipc_enable_bearer - enable bearer with the given name
475 */
476
477int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
478{
479 struct tipc_bearer *b_ptr;
480 struct media *m_ptr;
481 struct bearer_name b_name;
482 char addr_string[16];
483 u32 bearer_id;
484 u32 with_this_prio;
485 u32 i;
486 int res = -EINVAL;
487
488 if (tipc_mode != TIPC_NET_MODE) {
489 warn("Bearer <%s> rejected, not supported in standalone mode\n",
490 name);
491 return -ENOPROTOOPT;
492 }
493 if (!bearer_name_validate(name, &b_name)) {
494 warn("Bearer <%s> rejected, illegal name\n", name);
495 return -EINVAL;
496 }
497 if (tipc_addr_domain_valid(disc_domain) &&
498 (disc_domain != tipc_own_addr)) {
499 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
500 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
501 res = 0; /* accept any node in own cluster */
502 } else if (in_own_cluster(disc_domain))
503 res = 0; /* accept specified node in own cluster */
504 }
505 if (res) {
506 warn("Bearer <%s> rejected, illegal discovery domain\n", name);
507 return -EINVAL;
508 }
509 if ((priority < TIPC_MIN_LINK_PRI ||
510 priority > TIPC_MAX_LINK_PRI) &&
511 (priority != TIPC_MEDIA_LINK_PRI)) {
512 warn("Bearer <%s> rejected, illegal priority\n", name);
513 return -EINVAL;
514 }
515
516 write_lock_bh(&tipc_net_lock);
517
518 m_ptr = media_find(b_name.media_name);
519 if (!m_ptr) {
520 warn("Bearer <%s> rejected, media <%s> not registered\n", name,
521 b_name.media_name);
522 goto exit;
523 }
524
525 if (priority == TIPC_MEDIA_LINK_PRI)
526 priority = m_ptr->priority;
527
528restart:
529 bearer_id = MAX_BEARERS;
530 with_this_prio = 1;
531 for (i = MAX_BEARERS; i-- != 0; ) {
532 if (!tipc_bearers[i].active) {
533 bearer_id = i;
534 continue;
535 }
536 if (!strcmp(name, tipc_bearers[i].name)) {
537 warn("Bearer <%s> rejected, already enabled\n", name);
538 goto exit;
539 }
540 if ((tipc_bearers[i].priority == priority) &&
541 (++with_this_prio > 2)) {
542 if (priority-- == 0) {
543 warn("Bearer <%s> rejected, duplicate priority\n",
544 name);
545 goto exit;
546 }
547 warn("Bearer <%s> priority adjustment required %u->%u\n",
548 name, priority + 1, priority);
549 goto restart;
550 }
551 }
552 if (bearer_id >= MAX_BEARERS) {
553 warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
554 name, MAX_BEARERS);
555 goto exit;
556 }
557
558 b_ptr = &tipc_bearers[bearer_id];
559 strcpy(b_ptr->name, name);
560 res = m_ptr->enable_bearer(b_ptr);
561 if (res) {
562 warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
563 goto exit;
564 }
565
566 b_ptr->identity = bearer_id;
567 b_ptr->media = m_ptr;
568 b_ptr->net_plane = bearer_id + 'A';
569 b_ptr->active = 1;
570 b_ptr->priority = priority;
571 INIT_LIST_HEAD(&b_ptr->cong_links);
572 INIT_LIST_HEAD(&b_ptr->links);
573 spin_lock_init(&b_ptr->lock);
574
575 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
576 if (res) {
577 bearer_disable(b_ptr);
578 warn("Bearer <%s> rejected, discovery object creation failed\n",
579 name);
580 goto exit;
581 }
582 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
583 name, tipc_addr_string_fill(addr_string, disc_domain), priority);
584exit:
585 write_unlock_bh(&tipc_net_lock);
586 return res;
587}
588
589/**
590 * tipc_block_bearer(): Block the bearer with the given name,
591 * and reset all its links
592 */
593
594int tipc_block_bearer(const char *name)
595{
596 struct tipc_bearer *b_ptr = NULL;
597 struct link *l_ptr;
598 struct link *temp_l_ptr;
599
600 read_lock_bh(&tipc_net_lock);
601 b_ptr = bearer_find(name);
602 if (!b_ptr) {
603 warn("Attempt to block unknown bearer <%s>\n", name);
604 read_unlock_bh(&tipc_net_lock);
605 return -EINVAL;
606 }
607
608 info("Blocking bearer <%s>\n", name);
609 spin_lock_bh(&b_ptr->lock);
610 b_ptr->blocked = 1;
611 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
612 struct tipc_node *n_ptr = l_ptr->owner;
613
614 spin_lock_bh(&n_ptr->lock);
615 tipc_link_reset(l_ptr);
616 spin_unlock_bh(&n_ptr->lock);
617 }
618 spin_unlock_bh(&b_ptr->lock);
619 read_unlock_bh(&tipc_net_lock);
620 return 0;
621}
622
623/**
624 * bearer_disable -
625 *
626 * Note: This routine assumes caller holds tipc_net_lock.
627 */
628
629static void bearer_disable(struct tipc_bearer *b_ptr)
630{
631 struct link *l_ptr;
632 struct link *temp_l_ptr;
633
634 info("Disabling bearer <%s>\n", b_ptr->name);
635 spin_lock_bh(&b_ptr->lock);
636 b_ptr->blocked = 1;
637 b_ptr->media->disable_bearer(b_ptr);
638 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
639 tipc_link_delete(l_ptr);
640 }
641 if (b_ptr->link_req)
642 tipc_disc_delete(b_ptr->link_req);
643 spin_unlock_bh(&b_ptr->lock);
644 memset(b_ptr, 0, sizeof(struct tipc_bearer));
645}
646
647int tipc_disable_bearer(const char *name)
648{
649 struct tipc_bearer *b_ptr;
650 int res;
651
652 write_lock_bh(&tipc_net_lock);
653 b_ptr = bearer_find(name);
654 if (b_ptr == NULL) {
655 warn("Attempt to disable unknown bearer <%s>\n", name);
656 res = -EINVAL;
657 } else {
658 bearer_disable(b_ptr);
659 res = 0;
660 }
661 write_unlock_bh(&tipc_net_lock);
662 return res;
663}
664
665
666
667void tipc_bearer_stop(void)
668{
669 u32 i;
670
671 for (i = 0; i < MAX_BEARERS; i++) {
672 if (tipc_bearers[i].active)
673 bearer_disable(&tipc_bearers[i]);
674 }
675 media_count = 0;
676}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, 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#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 * @name: name to locate
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 * @type: type identifier to locate
91 */
92static struct tipc_media *media_find_id(u8 type)
93{
94 u32 i;
95
96 for (i = 0; media_info_array[i] != NULL; i++) {
97 if (media_info_array[i]->type_id == type)
98 break;
99 }
100 return media_info_array[i];
101}
102
103/**
104 * tipc_media_addr_printf - record media address in print buffer
105 * @buf: output buffer
106 * @len: output buffer size remaining
107 * @a: input media address
108 */
109int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
110{
111 char addr_str[MAX_ADDR_STR];
112 struct tipc_media *m;
113 int ret;
114
115 m = media_find_id(a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf + ret, len - ret,
125 "-%x", a->value[i]);
126 }
127 return ret;
128}
129
130/**
131 * bearer_name_validate - validate & (optionally) deconstruct bearer name
132 * @name: ptr to bearer name string
133 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
134 *
135 * Return: 1 if bearer name is valid, otherwise 0.
136 */
137static int bearer_name_validate(const char *name,
138 struct tipc_bearer_names *name_parts)
139{
140 char name_copy[TIPC_MAX_BEARER_NAME];
141 char *media_name;
142 char *if_name;
143 u32 media_len;
144 u32 if_len;
145
146 /* copy bearer name & ensure length is OK */
147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0)
148 return 0;
149
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
153 if (if_name == NULL)
154 return 0;
155 *(if_name++) = 0;
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
158
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
162 return 0;
163
164 /* return bearer name components, if necessary */
165 if (name_parts) {
166 strcpy(name_parts->media_name, media_name);
167 strcpy(name_parts->if_name, if_name);
168 }
169 return 1;
170}
171
172/**
173 * tipc_bearer_find - locates bearer object with matching bearer name
174 * @net: the applicable net namespace
175 * @name: bearer name to locate
176 */
177struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
178{
179 struct tipc_net *tn = net_generic(net, tipc_net_id);
180 struct tipc_bearer *b;
181 u32 i;
182
183 for (i = 0; i < MAX_BEARERS; i++) {
184 b = rtnl_dereference(tn->bearer_list[i]);
185 if (b && (!strcmp(b->name, name)))
186 return b;
187 }
188 return NULL;
189}
190
191/* tipc_bearer_get_name - get the bearer name from its id.
192 * @net: network namespace
193 * @name: a pointer to the buffer where the name will be stored.
194 * @bearer_id: the id to get the name from.
195 */
196int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
197{
198 struct tipc_net *tn = tipc_net(net);
199 struct tipc_bearer *b;
200
201 if (bearer_id >= MAX_BEARERS)
202 return -EINVAL;
203
204 b = rtnl_dereference(tn->bearer_list[bearer_id]);
205 if (!b)
206 return -EINVAL;
207
208 strcpy(name, b->name);
209 return 0;
210}
211
212void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
213{
214 struct tipc_net *tn = net_generic(net, tipc_net_id);
215 struct tipc_bearer *b;
216
217 rcu_read_lock();
218 b = rcu_dereference(tn->bearer_list[bearer_id]);
219 if (b)
220 tipc_disc_add_dest(b->disc);
221 rcu_read_unlock();
222}
223
224void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
225{
226 struct tipc_net *tn = net_generic(net, tipc_net_id);
227 struct tipc_bearer *b;
228
229 rcu_read_lock();
230 b = rcu_dereference(tn->bearer_list[bearer_id]);
231 if (b)
232 tipc_disc_remove_dest(b->disc);
233 rcu_read_unlock();
234}
235
236/**
237 * tipc_enable_bearer - enable bearer with the given name
238 * @net: the applicable net namespace
239 * @name: bearer name to enable
240 * @disc_domain: bearer domain
241 * @prio: bearer priority
242 * @attr: nlattr array
243 * @extack: netlink extended ack
244 */
245static int tipc_enable_bearer(struct net *net, const char *name,
246 u32 disc_domain, u32 prio,
247 struct nlattr *attr[],
248 struct netlink_ext_ack *extack)
249{
250 struct tipc_net *tn = tipc_net(net);
251 struct tipc_bearer_names b_names;
252 int with_this_prio = 1;
253 struct tipc_bearer *b;
254 struct tipc_media *m;
255 struct sk_buff *skb;
256 int bearer_id = 0;
257 int res = -EINVAL;
258 char *errstr = "";
259 u32 i;
260
261 if (!bearer_name_validate(name, &b_names)) {
262 errstr = "illegal name";
263 NL_SET_ERR_MSG(extack, "Illegal name");
264 goto rejected;
265 }
266
267 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
268 errstr = "illegal priority";
269 NL_SET_ERR_MSG(extack, "Illegal priority");
270 goto rejected;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 errstr = "media not registered";
276 NL_SET_ERR_MSG(extack, "Media not registered");
277 goto rejected;
278 }
279
280 if (prio == TIPC_MEDIA_LINK_PRI)
281 prio = m->priority;
282
283 /* Check new bearer vs existing ones and find free bearer id if any */
284 bearer_id = MAX_BEARERS;
285 i = MAX_BEARERS;
286 while (i-- != 0) {
287 b = rtnl_dereference(tn->bearer_list[i]);
288 if (!b) {
289 bearer_id = i;
290 continue;
291 }
292 if (!strcmp(name, b->name)) {
293 errstr = "already enabled";
294 NL_SET_ERR_MSG(extack, "Already enabled");
295 goto rejected;
296 }
297
298 if (b->priority == prio &&
299 (++with_this_prio > 2)) {
300 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
301 name, prio);
302
303 if (prio == TIPC_MIN_LINK_PRI) {
304 errstr = "cannot adjust to lower";
305 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
306 goto rejected;
307 }
308
309 pr_warn("Bearer <%s>: trying with adjusted priority\n",
310 name);
311 prio--;
312 bearer_id = MAX_BEARERS;
313 i = MAX_BEARERS;
314 with_this_prio = 1;
315 }
316 }
317
318 if (bearer_id >= MAX_BEARERS) {
319 errstr = "max 3 bearers permitted";
320 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
321 goto rejected;
322 }
323
324 b = kzalloc(sizeof(*b), GFP_ATOMIC);
325 if (!b)
326 return -ENOMEM;
327
328 strcpy(b->name, name);
329 b->media = m;
330 res = m->enable_media(net, b, attr);
331 if (res) {
332 kfree(b);
333 errstr = "failed to enable media";
334 NL_SET_ERR_MSG(extack, "Failed to enable media");
335 goto rejected;
336 }
337
338 b->identity = bearer_id;
339 b->tolerance = m->tolerance;
340 b->min_win = m->min_win;
341 b->max_win = m->max_win;
342 b->domain = disc_domain;
343 b->net_plane = bearer_id + 'A';
344 b->priority = prio;
345 refcount_set(&b->refcnt, 1);
346
347 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
348 if (res) {
349 bearer_disable(net, b);
350 errstr = "failed to create discoverer";
351 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
352 goto rejected;
353 }
354
355 test_and_set_bit_lock(0, &b->up);
356 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
357 if (skb)
358 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
359
360 if (tipc_mon_create(net, bearer_id)) {
361 bearer_disable(net, b);
362 return -ENOMEM;
363 }
364
365 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
366
367 return res;
368rejected:
369 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
370 return res;
371}
372
373/**
374 * tipc_reset_bearer - Reset all links established over this bearer
375 * @net: the applicable net namespace
376 * @b: the target bearer
377 */
378static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
379{
380 pr_info("Resetting bearer <%s>\n", b->name);
381 tipc_node_delete_links(net, b->identity);
382 tipc_disc_reset(net, b);
383 return 0;
384}
385
386bool tipc_bearer_hold(struct tipc_bearer *b)
387{
388 return (b && refcount_inc_not_zero(&b->refcnt));
389}
390
391void tipc_bearer_put(struct tipc_bearer *b)
392{
393 if (b && refcount_dec_and_test(&b->refcnt))
394 kfree_rcu(b, rcu);
395}
396
397/**
398 * bearer_disable - disable this bearer
399 * @net: the applicable net namespace
400 * @b: the bearer to disable
401 *
402 * Note: This routine assumes caller holds RTNL lock.
403 */
404static void bearer_disable(struct net *net, struct tipc_bearer *b)
405{
406 struct tipc_net *tn = tipc_net(net);
407 int bearer_id = b->identity;
408
409 pr_info("Disabling bearer <%s>\n", b->name);
410 clear_bit_unlock(0, &b->up);
411 tipc_node_delete_links(net, bearer_id);
412 b->media->disable_media(b);
413 RCU_INIT_POINTER(b->media_ptr, NULL);
414 if (b->disc)
415 tipc_disc_delete(b->disc);
416 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
417 tipc_bearer_put(b);
418 tipc_mon_delete(net, bearer_id);
419}
420
421int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
422 struct nlattr *attr[])
423{
424 char *dev_name = strchr((const char *)b->name, ':') + 1;
425 int hwaddr_len = b->media->hwaddr_len;
426 u8 node_id[NODE_ID_LEN] = {0,};
427 struct net_device *dev;
428
429 /* Find device with specified name */
430 dev = dev_get_by_name(net, dev_name);
431 if (!dev)
432 return -ENODEV;
433 if (tipc_mtu_bad(dev, 0)) {
434 dev_put(dev);
435 return -EINVAL;
436 }
437 if (dev == net->loopback_dev) {
438 dev_put(dev);
439 pr_info("Enabling <%s> not permitted\n", b->name);
440 return -EINVAL;
441 }
442
443 /* Autoconfigure own node identity if needed */
444 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
445 memcpy(node_id, dev->dev_addr, hwaddr_len);
446 tipc_net_init(net, node_id, 0);
447 }
448 if (!tipc_own_id(net)) {
449 dev_put(dev);
450 pr_warn("Failed to obtain node identity\n");
451 return -EINVAL;
452 }
453
454 /* Associate TIPC bearer with L2 bearer */
455 rcu_assign_pointer(b->media_ptr, dev);
456 b->pt.dev = dev;
457 b->pt.type = htons(ETH_P_TIPC);
458 b->pt.func = tipc_l2_rcv_msg;
459 dev_add_pack(&b->pt);
460 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
461 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
462 b->bcast_addr.media_id = b->media->type_id;
463 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
464 b->mtu = dev->mtu;
465 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
466 rcu_assign_pointer(dev->tipc_ptr, b);
467 return 0;
468}
469
470/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
471 * @b: the target bearer
472 *
473 * Mark L2 bearer as inactive so that incoming buffers are thrown away
474 */
475void tipc_disable_l2_media(struct tipc_bearer *b)
476{
477 struct net_device *dev;
478
479 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
480 dev_remove_pack(&b->pt);
481 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
482 synchronize_net();
483 dev_put(dev);
484}
485
486/**
487 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
488 * @net: the associated network namespace
489 * @skb: the packet to be sent
490 * @b: the bearer through which the packet is to be sent
491 * @dest: peer destination address
492 */
493int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
494 struct tipc_bearer *b, struct tipc_media_addr *dest)
495{
496 struct net_device *dev;
497 int delta;
498
499 dev = (struct net_device *)rcu_dereference(b->media_ptr);
500 if (!dev)
501 return 0;
502
503 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
504 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
505 kfree_skb(skb);
506 return 0;
507 }
508 skb_reset_network_header(skb);
509 skb->dev = dev;
510 skb->protocol = htons(ETH_P_TIPC);
511 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
512 dev->dev_addr, skb->len);
513 dev_queue_xmit(skb);
514 return 0;
515}
516
517bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
518{
519 bool supp = false;
520 struct tipc_bearer *b;
521
522 rcu_read_lock();
523 b = bearer_get(net, bearer_id);
524 if (b)
525 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
526 rcu_read_unlock();
527 return supp;
528}
529
530int tipc_bearer_mtu(struct net *net, u32 bearer_id)
531{
532 int mtu = 0;
533 struct tipc_bearer *b;
534
535 rcu_read_lock();
536 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
537 if (b)
538 mtu = b->mtu;
539 rcu_read_unlock();
540 return mtu;
541}
542
543/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
544 */
545void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
546 struct sk_buff *skb,
547 struct tipc_media_addr *dest)
548{
549 struct tipc_msg *hdr = buf_msg(skb);
550 struct tipc_bearer *b;
551
552 rcu_read_lock();
553 b = bearer_get(net, bearer_id);
554 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
555#ifdef CONFIG_TIPC_CRYPTO
556 tipc_crypto_xmit(net, &skb, b, dest, NULL);
557 if (skb)
558#endif
559 b->media->send_msg(net, skb, b, dest);
560 } else {
561 kfree_skb(skb);
562 }
563 rcu_read_unlock();
564}
565
566/* tipc_bearer_xmit() -send buffer to destination over bearer
567 */
568void tipc_bearer_xmit(struct net *net, u32 bearer_id,
569 struct sk_buff_head *xmitq,
570 struct tipc_media_addr *dst,
571 struct tipc_node *__dnode)
572{
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575
576 if (skb_queue_empty(xmitq))
577 return;
578
579 rcu_read_lock();
580 b = bearer_get(net, bearer_id);
581 if (unlikely(!b))
582 __skb_queue_purge(xmitq);
583 skb_queue_walk_safe(xmitq, skb, tmp) {
584 __skb_dequeue(xmitq);
585 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
586#ifdef CONFIG_TIPC_CRYPTO
587 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
588 if (skb)
589#endif
590 b->media->send_msg(net, skb, b, dst);
591 } else {
592 kfree_skb(skb);
593 }
594 }
595 rcu_read_unlock();
596}
597
598/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
599 */
600void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
601 struct sk_buff_head *xmitq)
602{
603 struct tipc_net *tn = tipc_net(net);
604 struct tipc_media_addr *dst;
605 int net_id = tn->net_id;
606 struct tipc_bearer *b;
607 struct sk_buff *skb, *tmp;
608 struct tipc_msg *hdr;
609
610 rcu_read_lock();
611 b = bearer_get(net, bearer_id);
612 if (unlikely(!b || !test_bit(0, &b->up)))
613 __skb_queue_purge(xmitq);
614 skb_queue_walk_safe(xmitq, skb, tmp) {
615 hdr = buf_msg(skb);
616 msg_set_non_seq(hdr, 1);
617 msg_set_mc_netid(hdr, net_id);
618 __skb_dequeue(xmitq);
619 dst = &b->bcast_addr;
620#ifdef CONFIG_TIPC_CRYPTO
621 tipc_crypto_xmit(net, &skb, b, dst, NULL);
622 if (skb)
623#endif
624 b->media->send_msg(net, skb, b, dst);
625 }
626 rcu_read_unlock();
627}
628
629/**
630 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
631 * @skb: the received message
632 * @dev: the net device that the packet was received on
633 * @pt: the packet_type structure which was used to register this handler
634 * @orig_dev: the original receive net device in case the device is a bond
635 *
636 * Accept only packets explicitly sent to this node, or broadcast packets;
637 * ignores packets sent using interface multicast, and traffic sent to other
638 * nodes (which can happen if interface is running in promiscuous mode).
639 */
640static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
641 struct packet_type *pt, struct net_device *orig_dev)
642{
643 struct tipc_bearer *b;
644
645 rcu_read_lock();
646 b = rcu_dereference(dev->tipc_ptr) ?:
647 rcu_dereference(orig_dev->tipc_ptr);
648 if (likely(b && test_bit(0, &b->up) &&
649 (skb->pkt_type <= PACKET_MULTICAST))) {
650 skb_mark_not_on_list(skb);
651 TIPC_SKB_CB(skb)->flags = 0;
652 tipc_rcv(dev_net(b->pt.dev), skb, b);
653 rcu_read_unlock();
654 return NET_RX_SUCCESS;
655 }
656 rcu_read_unlock();
657 kfree_skb(skb);
658 return NET_RX_DROP;
659}
660
661/**
662 * tipc_l2_device_event - handle device events from network device
663 * @nb: the context of the notification
664 * @evt: the type of event
665 * @ptr: the net device that the event was on
666 *
667 * This function is called by the Ethernet driver in case of link
668 * change event.
669 */
670static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
671 void *ptr)
672{
673 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
674 struct net *net = dev_net(dev);
675 struct tipc_bearer *b;
676
677 b = rtnl_dereference(dev->tipc_ptr);
678 if (!b)
679 return NOTIFY_DONE;
680
681 trace_tipc_l2_device_event(dev, b, evt);
682 switch (evt) {
683 case NETDEV_CHANGE:
684 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
685 test_and_set_bit_lock(0, &b->up);
686 break;
687 }
688 fallthrough;
689 case NETDEV_GOING_DOWN:
690 clear_bit_unlock(0, &b->up);
691 tipc_reset_bearer(net, b);
692 break;
693 case NETDEV_UP:
694 test_and_set_bit_lock(0, &b->up);
695 break;
696 case NETDEV_CHANGEMTU:
697 if (tipc_mtu_bad(dev, 0)) {
698 bearer_disable(net, b);
699 break;
700 }
701 b->mtu = dev->mtu;
702 tipc_reset_bearer(net, b);
703 break;
704 case NETDEV_CHANGEADDR:
705 b->media->raw2addr(b, &b->addr,
706 (char *)dev->dev_addr);
707 tipc_reset_bearer(net, b);
708 break;
709 case NETDEV_UNREGISTER:
710 case NETDEV_CHANGENAME:
711 bearer_disable(net, b);
712 break;
713 }
714 return NOTIFY_OK;
715}
716
717static struct notifier_block notifier = {
718 .notifier_call = tipc_l2_device_event,
719 .priority = 0,
720};
721
722int tipc_bearer_setup(void)
723{
724 return register_netdevice_notifier(¬ifier);
725}
726
727void tipc_bearer_cleanup(void)
728{
729 unregister_netdevice_notifier(¬ifier);
730}
731
732void tipc_bearer_stop(struct net *net)
733{
734 struct tipc_net *tn = net_generic(net, tipc_net_id);
735 struct tipc_bearer *b;
736 u32 i;
737
738 for (i = 0; i < MAX_BEARERS; i++) {
739 b = rtnl_dereference(tn->bearer_list[i]);
740 if (b) {
741 bearer_disable(net, b);
742 tn->bearer_list[i] = NULL;
743 }
744 }
745}
746
747void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
748{
749 struct net_device *dev = net->loopback_dev;
750 struct sk_buff *skb, *_skb;
751 int exp;
752
753 skb_queue_walk(pkts, _skb) {
754 skb = pskb_copy(_skb, GFP_ATOMIC);
755 if (!skb)
756 continue;
757
758 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
759 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
760 kfree_skb(skb);
761 continue;
762 }
763
764 skb_reset_network_header(skb);
765 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
766 dev->dev_addr, skb->len);
767 skb->dev = dev;
768 skb->pkt_type = PACKET_HOST;
769 skb->ip_summed = CHECKSUM_UNNECESSARY;
770 skb->protocol = eth_type_trans(skb, dev);
771 netif_rx_ni(skb);
772 }
773}
774
775static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
776 struct packet_type *pt, struct net_device *od)
777{
778 consume_skb(skb);
779 return NET_RX_SUCCESS;
780}
781
782int tipc_attach_loopback(struct net *net)
783{
784 struct net_device *dev = net->loopback_dev;
785 struct tipc_net *tn = tipc_net(net);
786
787 if (!dev)
788 return -ENODEV;
789
790 dev_hold(dev);
791 tn->loopback_pt.dev = dev;
792 tn->loopback_pt.type = htons(ETH_P_TIPC);
793 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
794 dev_add_pack(&tn->loopback_pt);
795 return 0;
796}
797
798void tipc_detach_loopback(struct net *net)
799{
800 struct tipc_net *tn = tipc_net(net);
801
802 dev_remove_pack(&tn->loopback_pt);
803 dev_put(net->loopback_dev);
804}
805
806/* Caller should hold rtnl_lock to protect the bearer */
807static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
808 struct tipc_bearer *bearer, int nlflags)
809{
810 void *hdr;
811 struct nlattr *attrs;
812 struct nlattr *prop;
813
814 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
815 nlflags, TIPC_NL_BEARER_GET);
816 if (!hdr)
817 return -EMSGSIZE;
818
819 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
820 if (!attrs)
821 goto msg_full;
822
823 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
824 goto attr_msg_full;
825
826 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
827 if (!prop)
828 goto prop_msg_full;
829 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
830 goto prop_msg_full;
831 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
832 goto prop_msg_full;
833 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
834 goto prop_msg_full;
835 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
836 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
837 goto prop_msg_full;
838
839 nla_nest_end(msg->skb, prop);
840
841#ifdef CONFIG_TIPC_MEDIA_UDP
842 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
843 if (tipc_udp_nl_add_bearer_data(msg, bearer))
844 goto attr_msg_full;
845 }
846#endif
847
848 nla_nest_end(msg->skb, attrs);
849 genlmsg_end(msg->skb, hdr);
850
851 return 0;
852
853prop_msg_full:
854 nla_nest_cancel(msg->skb, prop);
855attr_msg_full:
856 nla_nest_cancel(msg->skb, attrs);
857msg_full:
858 genlmsg_cancel(msg->skb, hdr);
859
860 return -EMSGSIZE;
861}
862
863int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
864{
865 int err;
866 int i = cb->args[0];
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct net *net = sock_net(skb->sk);
870 struct tipc_net *tn = net_generic(net, tipc_net_id);
871
872 if (i == MAX_BEARERS)
873 return 0;
874
875 msg.skb = skb;
876 msg.portid = NETLINK_CB(cb->skb).portid;
877 msg.seq = cb->nlh->nlmsg_seq;
878
879 rtnl_lock();
880 for (i = 0; i < MAX_BEARERS; i++) {
881 bearer = rtnl_dereference(tn->bearer_list[i]);
882 if (!bearer)
883 continue;
884
885 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
886 if (err)
887 break;
888 }
889 rtnl_unlock();
890
891 cb->args[0] = i;
892 return skb->len;
893}
894
895int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
896{
897 int err;
898 char *name;
899 struct sk_buff *rep;
900 struct tipc_bearer *bearer;
901 struct tipc_nl_msg msg;
902 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
903 struct net *net = genl_info_net(info);
904
905 if (!info->attrs[TIPC_NLA_BEARER])
906 return -EINVAL;
907
908 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
909 info->attrs[TIPC_NLA_BEARER],
910 tipc_nl_bearer_policy, info->extack);
911 if (err)
912 return err;
913
914 if (!attrs[TIPC_NLA_BEARER_NAME])
915 return -EINVAL;
916 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
917
918 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
919 if (!rep)
920 return -ENOMEM;
921
922 msg.skb = rep;
923 msg.portid = info->snd_portid;
924 msg.seq = info->snd_seq;
925
926 rtnl_lock();
927 bearer = tipc_bearer_find(net, name);
928 if (!bearer) {
929 err = -EINVAL;
930 NL_SET_ERR_MSG(info->extack, "Bearer not found");
931 goto err_out;
932 }
933
934 err = __tipc_nl_add_bearer(&msg, bearer, 0);
935 if (err)
936 goto err_out;
937 rtnl_unlock();
938
939 return genlmsg_reply(rep, info);
940err_out:
941 rtnl_unlock();
942 nlmsg_free(rep);
943
944 return err;
945}
946
947int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
948{
949 int err;
950 char *name;
951 struct tipc_bearer *bearer;
952 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
953 struct net *net = sock_net(skb->sk);
954
955 if (!info->attrs[TIPC_NLA_BEARER])
956 return -EINVAL;
957
958 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
959 info->attrs[TIPC_NLA_BEARER],
960 tipc_nl_bearer_policy, info->extack);
961 if (err)
962 return err;
963
964 if (!attrs[TIPC_NLA_BEARER_NAME])
965 return -EINVAL;
966
967 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
968
969 bearer = tipc_bearer_find(net, name);
970 if (!bearer) {
971 NL_SET_ERR_MSG(info->extack, "Bearer not found");
972 return -EINVAL;
973 }
974
975 bearer_disable(net, bearer);
976
977 return 0;
978}
979
980int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
981{
982 int err;
983
984 rtnl_lock();
985 err = __tipc_nl_bearer_disable(skb, info);
986 rtnl_unlock();
987
988 return err;
989}
990
991int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
992{
993 int err;
994 char *bearer;
995 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
996 struct net *net = sock_net(skb->sk);
997 u32 domain = 0;
998 u32 prio;
999
1000 prio = TIPC_MEDIA_LINK_PRI;
1001
1002 if (!info->attrs[TIPC_NLA_BEARER])
1003 return -EINVAL;
1004
1005 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1006 info->attrs[TIPC_NLA_BEARER],
1007 tipc_nl_bearer_policy, info->extack);
1008 if (err)
1009 return err;
1010
1011 if (!attrs[TIPC_NLA_BEARER_NAME])
1012 return -EINVAL;
1013
1014 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1015
1016 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1017 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1018
1019 if (attrs[TIPC_NLA_BEARER_PROP]) {
1020 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1021
1022 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1023 props);
1024 if (err)
1025 return err;
1026
1027 if (props[TIPC_NLA_PROP_PRIO])
1028 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1029 }
1030
1031 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1032 info->extack);
1033}
1034
1035int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1036{
1037 int err;
1038
1039 rtnl_lock();
1040 err = __tipc_nl_bearer_enable(skb, info);
1041 rtnl_unlock();
1042
1043 return err;
1044}
1045
1046int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1047{
1048 int err;
1049 char *name;
1050 struct tipc_bearer *b;
1051 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1052 struct net *net = sock_net(skb->sk);
1053
1054 if (!info->attrs[TIPC_NLA_BEARER])
1055 return -EINVAL;
1056
1057 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1058 info->attrs[TIPC_NLA_BEARER],
1059 tipc_nl_bearer_policy, info->extack);
1060 if (err)
1061 return err;
1062
1063 if (!attrs[TIPC_NLA_BEARER_NAME])
1064 return -EINVAL;
1065 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1066
1067 rtnl_lock();
1068 b = tipc_bearer_find(net, name);
1069 if (!b) {
1070 rtnl_unlock();
1071 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1072 return -EINVAL;
1073 }
1074
1075#ifdef CONFIG_TIPC_MEDIA_UDP
1076 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1077 err = tipc_udp_nl_bearer_add(b,
1078 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1079 if (err) {
1080 rtnl_unlock();
1081 return err;
1082 }
1083 }
1084#endif
1085 rtnl_unlock();
1086
1087 return 0;
1088}
1089
1090int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1091{
1092 struct tipc_bearer *b;
1093 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1094 struct net *net = sock_net(skb->sk);
1095 char *name;
1096 int err;
1097
1098 if (!info->attrs[TIPC_NLA_BEARER])
1099 return -EINVAL;
1100
1101 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1102 info->attrs[TIPC_NLA_BEARER],
1103 tipc_nl_bearer_policy, info->extack);
1104 if (err)
1105 return err;
1106
1107 if (!attrs[TIPC_NLA_BEARER_NAME])
1108 return -EINVAL;
1109 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1110
1111 b = tipc_bearer_find(net, name);
1112 if (!b) {
1113 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1114 return -EINVAL;
1115 }
1116
1117 if (attrs[TIPC_NLA_BEARER_PROP]) {
1118 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1119
1120 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1121 props);
1122 if (err)
1123 return err;
1124
1125 if (props[TIPC_NLA_PROP_TOL]) {
1126 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1127 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1128 }
1129 if (props[TIPC_NLA_PROP_PRIO])
1130 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1131 if (props[TIPC_NLA_PROP_WIN])
1132 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1133 if (props[TIPC_NLA_PROP_MTU]) {
1134 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1135 NL_SET_ERR_MSG(info->extack,
1136 "MTU property is unsupported");
1137 return -EINVAL;
1138 }
1139#ifdef CONFIG_TIPC_MEDIA_UDP
1140 if (tipc_udp_mtu_bad(nla_get_u32
1141 (props[TIPC_NLA_PROP_MTU]))) {
1142 NL_SET_ERR_MSG(info->extack,
1143 "MTU value is out-of-range");
1144 return -EINVAL;
1145 }
1146 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1147 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1148#endif
1149 }
1150 }
1151
1152 return 0;
1153}
1154
1155int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1156{
1157 int err;
1158
1159 rtnl_lock();
1160 err = __tipc_nl_bearer_set(skb, info);
1161 rtnl_unlock();
1162
1163 return err;
1164}
1165
1166static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1167 struct tipc_media *media, int nlflags)
1168{
1169 void *hdr;
1170 struct nlattr *attrs;
1171 struct nlattr *prop;
1172
1173 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1174 nlflags, TIPC_NL_MEDIA_GET);
1175 if (!hdr)
1176 return -EMSGSIZE;
1177
1178 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1179 if (!attrs)
1180 goto msg_full;
1181
1182 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1183 goto attr_msg_full;
1184
1185 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1186 if (!prop)
1187 goto prop_msg_full;
1188 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1189 goto prop_msg_full;
1190 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1191 goto prop_msg_full;
1192 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1193 goto prop_msg_full;
1194 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1195 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1196 goto prop_msg_full;
1197
1198 nla_nest_end(msg->skb, prop);
1199 nla_nest_end(msg->skb, attrs);
1200 genlmsg_end(msg->skb, hdr);
1201
1202 return 0;
1203
1204prop_msg_full:
1205 nla_nest_cancel(msg->skb, prop);
1206attr_msg_full:
1207 nla_nest_cancel(msg->skb, attrs);
1208msg_full:
1209 genlmsg_cancel(msg->skb, hdr);
1210
1211 return -EMSGSIZE;
1212}
1213
1214int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1215{
1216 int err;
1217 int i = cb->args[0];
1218 struct tipc_nl_msg msg;
1219
1220 if (i == MAX_MEDIA)
1221 return 0;
1222
1223 msg.skb = skb;
1224 msg.portid = NETLINK_CB(cb->skb).portid;
1225 msg.seq = cb->nlh->nlmsg_seq;
1226
1227 rtnl_lock();
1228 for (; media_info_array[i] != NULL; i++) {
1229 err = __tipc_nl_add_media(&msg, media_info_array[i],
1230 NLM_F_MULTI);
1231 if (err)
1232 break;
1233 }
1234 rtnl_unlock();
1235
1236 cb->args[0] = i;
1237 return skb->len;
1238}
1239
1240int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1241{
1242 int err;
1243 char *name;
1244 struct tipc_nl_msg msg;
1245 struct tipc_media *media;
1246 struct sk_buff *rep;
1247 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1248
1249 if (!info->attrs[TIPC_NLA_MEDIA])
1250 return -EINVAL;
1251
1252 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1253 info->attrs[TIPC_NLA_MEDIA],
1254 tipc_nl_media_policy, info->extack);
1255 if (err)
1256 return err;
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1263 if (!rep)
1264 return -ENOMEM;
1265
1266 msg.skb = rep;
1267 msg.portid = info->snd_portid;
1268 msg.seq = info->snd_seq;
1269
1270 rtnl_lock();
1271 media = tipc_media_find(name);
1272 if (!media) {
1273 NL_SET_ERR_MSG(info->extack, "Media not found");
1274 err = -EINVAL;
1275 goto err_out;
1276 }
1277
1278 err = __tipc_nl_add_media(&msg, media, 0);
1279 if (err)
1280 goto err_out;
1281 rtnl_unlock();
1282
1283 return genlmsg_reply(rep, info);
1284err_out:
1285 rtnl_unlock();
1286 nlmsg_free(rep);
1287
1288 return err;
1289}
1290
1291int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1292{
1293 int err;
1294 char *name;
1295 struct tipc_media *m;
1296 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1297
1298 if (!info->attrs[TIPC_NLA_MEDIA])
1299 return -EINVAL;
1300
1301 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1302 info->attrs[TIPC_NLA_MEDIA],
1303 tipc_nl_media_policy, info->extack);
1304
1305 if (!attrs[TIPC_NLA_MEDIA_NAME])
1306 return -EINVAL;
1307 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1308
1309 m = tipc_media_find(name);
1310 if (!m) {
1311 NL_SET_ERR_MSG(info->extack, "Media not found");
1312 return -EINVAL;
1313 }
1314 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1315 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1316
1317 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1318 props);
1319 if (err)
1320 return err;
1321
1322 if (props[TIPC_NLA_PROP_TOL])
1323 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1324 if (props[TIPC_NLA_PROP_PRIO])
1325 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1326 if (props[TIPC_NLA_PROP_WIN])
1327 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1328 if (props[TIPC_NLA_PROP_MTU]) {
1329 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1330 NL_SET_ERR_MSG(info->extack,
1331 "MTU property is unsupported");
1332 return -EINVAL;
1333 }
1334#ifdef CONFIG_TIPC_MEDIA_UDP
1335 if (tipc_udp_mtu_bad(nla_get_u32
1336 (props[TIPC_NLA_PROP_MTU]))) {
1337 NL_SET_ERR_MSG(info->extack,
1338 "MTU value is out-of-range");
1339 return -EINVAL;
1340 }
1341 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1342#endif
1343 }
1344 }
1345
1346 return 0;
1347}
1348
1349int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1350{
1351 int err;
1352
1353 rtnl_lock();
1354 err = __tipc_nl_media_set(skb, info);
1355 rtnl_unlock();
1356
1357 return err;
1358}