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
51 static 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
bearer_get(struct net * net,int bearer_id)62 static 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
69 static void bearer_disable(struct net *net, struct tipc_bearer *b);
70 static 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 */
tipc_media_find(const char * name)77 struct 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 */
media_find_id(u8 type)92 static 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 */
tipc_media_addr_printf(char * buf,int len,struct tipc_media_addr * a)109 int 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 */
bearer_name_validate(const char * name,struct tipc_bearer_names * name_parts)137 static 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 */
tipc_bearer_find(struct net * net,const char * name)177 struct 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 */
tipc_bearer_get_name(struct net * net,char * name,u32 bearer_id)196 int 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
tipc_bearer_add_dest(struct net * net,u32 bearer_id,u32 dest)212 void 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
tipc_bearer_remove_dest(struct net * net,u32 bearer_id,u32 dest)224 void 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 */
tipc_enable_bearer(struct net * net,const char * name,u32 disc_domain,u32 prio,struct nlattr * attr[],struct netlink_ext_ack * extack)245 static 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 NL_SET_ERR_MSG(extack, "Illegal name");
263 return res;
264 }
265
266 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
267 errstr = "illegal priority";
268 NL_SET_ERR_MSG(extack, "Illegal priority");
269 goto rejected;
270 }
271
272 m = tipc_media_find(b_names.media_name);
273 if (!m) {
274 errstr = "media not registered";
275 NL_SET_ERR_MSG(extack, "Media not registered");
276 goto rejected;
277 }
278
279 if (prio == TIPC_MEDIA_LINK_PRI)
280 prio = m->priority;
281
282 /* Check new bearer vs existing ones and find free bearer id if any */
283 bearer_id = MAX_BEARERS;
284 i = MAX_BEARERS;
285 while (i-- != 0) {
286 b = rtnl_dereference(tn->bearer_list[i]);
287 if (!b) {
288 bearer_id = i;
289 continue;
290 }
291 if (!strcmp(name, b->name)) {
292 errstr = "already enabled";
293 NL_SET_ERR_MSG(extack, "Already enabled");
294 goto rejected;
295 }
296
297 if (b->priority == prio &&
298 (++with_this_prio > 2)) {
299 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
300 name, prio);
301
302 if (prio == TIPC_MIN_LINK_PRI) {
303 errstr = "cannot adjust to lower";
304 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
305 goto rejected;
306 }
307
308 pr_warn("Bearer <%s>: trying with adjusted priority\n",
309 name);
310 prio--;
311 bearer_id = MAX_BEARERS;
312 i = MAX_BEARERS;
313 with_this_prio = 1;
314 }
315 }
316
317 if (bearer_id >= MAX_BEARERS) {
318 errstr = "max 3 bearers permitted";
319 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
320 goto rejected;
321 }
322
323 b = kzalloc(sizeof(*b), GFP_ATOMIC);
324 if (!b)
325 return -ENOMEM;
326
327 strcpy(b->name, name);
328 b->media = m;
329 res = m->enable_media(net, b, attr);
330 if (res) {
331 kfree(b);
332 errstr = "failed to enable media";
333 NL_SET_ERR_MSG(extack, "Failed to enable media");
334 goto rejected;
335 }
336
337 b->identity = bearer_id;
338 b->tolerance = m->tolerance;
339 b->min_win = m->min_win;
340 b->max_win = m->max_win;
341 b->domain = disc_domain;
342 b->net_plane = bearer_id + 'A';
343 b->priority = prio;
344 refcount_set(&b->refcnt, 1);
345
346 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
347 if (res) {
348 bearer_disable(net, b);
349 errstr = "failed to create discoverer";
350 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
351 goto rejected;
352 }
353
354 /* Create monitoring data before accepting activate messages */
355 if (tipc_mon_create(net, bearer_id)) {
356 bearer_disable(net, b);
357 kfree_skb(skb);
358 return -ENOMEM;
359 }
360
361 test_and_set_bit_lock(0, &b->up);
362 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
363 if (skb)
364 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
365
366 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
367
368 return res;
369 rejected:
370 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
371 return res;
372 }
373
374 /**
375 * tipc_reset_bearer - Reset all links established over this bearer
376 * @net: the applicable net namespace
377 * @b: the target bearer
378 */
tipc_reset_bearer(struct net * net,struct tipc_bearer * b)379 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
380 {
381 pr_info("Resetting bearer <%s>\n", b->name);
382 tipc_node_delete_links(net, b->identity);
383 tipc_disc_reset(net, b);
384 return 0;
385 }
386
tipc_bearer_hold(struct tipc_bearer * b)387 bool tipc_bearer_hold(struct tipc_bearer *b)
388 {
389 return (b && refcount_inc_not_zero(&b->refcnt));
390 }
391
tipc_bearer_put(struct tipc_bearer * b)392 void tipc_bearer_put(struct tipc_bearer *b)
393 {
394 if (b && refcount_dec_and_test(&b->refcnt))
395 kfree_rcu(b, rcu);
396 }
397
398 /**
399 * bearer_disable - disable this bearer
400 * @net: the applicable net namespace
401 * @b: the bearer to disable
402 *
403 * Note: This routine assumes caller holds RTNL lock.
404 */
bearer_disable(struct net * net,struct tipc_bearer * b)405 static void bearer_disable(struct net *net, struct tipc_bearer *b)
406 {
407 struct tipc_net *tn = tipc_net(net);
408 int bearer_id = b->identity;
409
410 pr_info("Disabling bearer <%s>\n", b->name);
411 clear_bit_unlock(0, &b->up);
412 tipc_node_delete_links(net, bearer_id);
413 b->media->disable_media(b);
414 RCU_INIT_POINTER(b->media_ptr, NULL);
415 if (b->disc)
416 tipc_disc_delete(b->disc);
417 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
418 tipc_bearer_put(b);
419 tipc_mon_delete(net, bearer_id);
420 }
421
tipc_enable_l2_media(struct net * net,struct tipc_bearer * b,struct nlattr * attr[])422 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
423 struct nlattr *attr[])
424 {
425 char *dev_name = strchr((const char *)b->name, ':') + 1;
426 int hwaddr_len = b->media->hwaddr_len;
427 u8 node_id[NODE_ID_LEN] = {0,};
428 struct net_device *dev;
429
430 /* Find device with specified name */
431 dev = dev_get_by_name(net, dev_name);
432 if (!dev)
433 return -ENODEV;
434 if (tipc_mtu_bad(dev, 0)) {
435 dev_put(dev);
436 return -EINVAL;
437 }
438 if (dev == net->loopback_dev) {
439 dev_put(dev);
440 pr_info("Enabling <%s> not permitted\n", b->name);
441 return -EINVAL;
442 }
443
444 /* Autoconfigure own node identity if needed */
445 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
446 memcpy(node_id, dev->dev_addr, hwaddr_len);
447 tipc_net_init(net, node_id, 0);
448 }
449 if (!tipc_own_id(net)) {
450 dev_put(dev);
451 pr_warn("Failed to obtain node identity\n");
452 return -EINVAL;
453 }
454
455 /* Associate TIPC bearer with L2 bearer */
456 rcu_assign_pointer(b->media_ptr, dev);
457 b->pt.dev = dev;
458 b->pt.type = htons(ETH_P_TIPC);
459 b->pt.func = tipc_l2_rcv_msg;
460 dev_add_pack(&b->pt);
461 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
462 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
463 b->bcast_addr.media_id = b->media->type_id;
464 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
465 b->mtu = dev->mtu;
466 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
467 rcu_assign_pointer(dev->tipc_ptr, b);
468 return 0;
469 }
470
471 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
472 * @b: the target bearer
473 *
474 * Mark L2 bearer as inactive so that incoming buffers are thrown away
475 */
tipc_disable_l2_media(struct tipc_bearer * b)476 void tipc_disable_l2_media(struct tipc_bearer *b)
477 {
478 struct net_device *dev;
479
480 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
481 dev_remove_pack(&b->pt);
482 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
483 synchronize_net();
484 dev_put(dev);
485 }
486
487 /**
488 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
489 * @net: the associated network namespace
490 * @skb: the packet to be sent
491 * @b: the bearer through which the packet is to be sent
492 * @dest: peer destination address
493 */
tipc_l2_send_msg(struct net * net,struct sk_buff * skb,struct tipc_bearer * b,struct tipc_media_addr * dest)494 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
495 struct tipc_bearer *b, struct tipc_media_addr *dest)
496 {
497 struct net_device *dev;
498 int delta;
499
500 dev = (struct net_device *)rcu_dereference(b->media_ptr);
501 if (!dev)
502 return 0;
503
504 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
505 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
506 kfree_skb(skb);
507 return 0;
508 }
509 skb_reset_network_header(skb);
510 skb->dev = dev;
511 skb->protocol = htons(ETH_P_TIPC);
512 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
513 dev->dev_addr, skb->len);
514 dev_queue_xmit(skb);
515 return 0;
516 }
517
tipc_bearer_bcast_support(struct net * net,u32 bearer_id)518 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
519 {
520 bool supp = false;
521 struct tipc_bearer *b;
522
523 rcu_read_lock();
524 b = bearer_get(net, bearer_id);
525 if (b)
526 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
527 rcu_read_unlock();
528 return supp;
529 }
530
tipc_bearer_mtu(struct net * net,u32 bearer_id)531 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
532 {
533 int mtu = 0;
534 struct tipc_bearer *b;
535
536 rcu_read_lock();
537 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
538 if (b)
539 mtu = b->mtu;
540 rcu_read_unlock();
541 return mtu;
542 }
543
tipc_bearer_min_mtu(struct net * net,u32 bearer_id)544 int tipc_bearer_min_mtu(struct net *net, u32 bearer_id)
545 {
546 int mtu = TIPC_MIN_BEARER_MTU;
547 struct tipc_bearer *b;
548
549 rcu_read_lock();
550 b = bearer_get(net, bearer_id);
551 if (b)
552 mtu += b->encap_hlen;
553 rcu_read_unlock();
554 return mtu;
555 }
556
557 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
558 */
tipc_bearer_xmit_skb(struct net * net,u32 bearer_id,struct sk_buff * skb,struct tipc_media_addr * dest)559 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
560 struct sk_buff *skb,
561 struct tipc_media_addr *dest)
562 {
563 struct tipc_msg *hdr = buf_msg(skb);
564 struct tipc_bearer *b;
565
566 rcu_read_lock();
567 b = bearer_get(net, bearer_id);
568 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
569 #ifdef CONFIG_TIPC_CRYPTO
570 tipc_crypto_xmit(net, &skb, b, dest, NULL);
571 if (skb)
572 #endif
573 b->media->send_msg(net, skb, b, dest);
574 } else {
575 kfree_skb(skb);
576 }
577 rcu_read_unlock();
578 }
579
580 /* tipc_bearer_xmit() -send buffer to destination over bearer
581 */
tipc_bearer_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq,struct tipc_media_addr * dst,struct tipc_node * __dnode)582 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
583 struct sk_buff_head *xmitq,
584 struct tipc_media_addr *dst,
585 struct tipc_node *__dnode)
586 {
587 struct tipc_bearer *b;
588 struct sk_buff *skb, *tmp;
589
590 if (skb_queue_empty(xmitq))
591 return;
592
593 rcu_read_lock();
594 b = bearer_get(net, bearer_id);
595 if (unlikely(!b))
596 __skb_queue_purge(xmitq);
597 skb_queue_walk_safe(xmitq, skb, tmp) {
598 __skb_dequeue(xmitq);
599 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
600 #ifdef CONFIG_TIPC_CRYPTO
601 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
602 if (skb)
603 #endif
604 b->media->send_msg(net, skb, b, dst);
605 } else {
606 kfree_skb(skb);
607 }
608 }
609 rcu_read_unlock();
610 }
611
612 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
613 */
tipc_bearer_bc_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq)614 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
615 struct sk_buff_head *xmitq)
616 {
617 struct tipc_net *tn = tipc_net(net);
618 struct tipc_media_addr *dst;
619 int net_id = tn->net_id;
620 struct tipc_bearer *b;
621 struct sk_buff *skb, *tmp;
622 struct tipc_msg *hdr;
623
624 rcu_read_lock();
625 b = bearer_get(net, bearer_id);
626 if (unlikely(!b || !test_bit(0, &b->up)))
627 __skb_queue_purge(xmitq);
628 skb_queue_walk_safe(xmitq, skb, tmp) {
629 hdr = buf_msg(skb);
630 msg_set_non_seq(hdr, 1);
631 msg_set_mc_netid(hdr, net_id);
632 __skb_dequeue(xmitq);
633 dst = &b->bcast_addr;
634 #ifdef CONFIG_TIPC_CRYPTO
635 tipc_crypto_xmit(net, &skb, b, dst, NULL);
636 if (skb)
637 #endif
638 b->media->send_msg(net, skb, b, dst);
639 }
640 rcu_read_unlock();
641 }
642
643 /**
644 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
645 * @skb: the received message
646 * @dev: the net device that the packet was received on
647 * @pt: the packet_type structure which was used to register this handler
648 * @orig_dev: the original receive net device in case the device is a bond
649 *
650 * Accept only packets explicitly sent to this node, or broadcast packets;
651 * ignores packets sent using interface multicast, and traffic sent to other
652 * nodes (which can happen if interface is running in promiscuous mode).
653 */
tipc_l2_rcv_msg(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)654 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
655 struct packet_type *pt, struct net_device *orig_dev)
656 {
657 struct tipc_bearer *b;
658
659 rcu_read_lock();
660 b = rcu_dereference(dev->tipc_ptr) ?:
661 rcu_dereference(orig_dev->tipc_ptr);
662 if (likely(b && test_bit(0, &b->up) &&
663 (skb->pkt_type <= PACKET_MULTICAST))) {
664 skb_mark_not_on_list(skb);
665 TIPC_SKB_CB(skb)->flags = 0;
666 tipc_rcv(dev_net(b->pt.dev), skb, b);
667 rcu_read_unlock();
668 return NET_RX_SUCCESS;
669 }
670 rcu_read_unlock();
671 kfree_skb(skb);
672 return NET_RX_DROP;
673 }
674
675 /**
676 * tipc_l2_device_event - handle device events from network device
677 * @nb: the context of the notification
678 * @evt: the type of event
679 * @ptr: the net device that the event was on
680 *
681 * This function is called by the Ethernet driver in case of link
682 * change event.
683 */
tipc_l2_device_event(struct notifier_block * nb,unsigned long evt,void * ptr)684 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
685 void *ptr)
686 {
687 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
688 struct net *net = dev_net(dev);
689 struct tipc_bearer *b;
690
691 b = rtnl_dereference(dev->tipc_ptr);
692 if (!b)
693 return NOTIFY_DONE;
694
695 trace_tipc_l2_device_event(dev, b, evt);
696 switch (evt) {
697 case NETDEV_CHANGE:
698 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
699 test_and_set_bit_lock(0, &b->up);
700 break;
701 }
702 fallthrough;
703 case NETDEV_GOING_DOWN:
704 clear_bit_unlock(0, &b->up);
705 tipc_reset_bearer(net, b);
706 break;
707 case NETDEV_UP:
708 test_and_set_bit_lock(0, &b->up);
709 break;
710 case NETDEV_CHANGEMTU:
711 if (tipc_mtu_bad(dev, 0)) {
712 bearer_disable(net, b);
713 break;
714 }
715 b->mtu = dev->mtu;
716 tipc_reset_bearer(net, b);
717 break;
718 case NETDEV_CHANGEADDR:
719 b->media->raw2addr(b, &b->addr,
720 (const char *)dev->dev_addr);
721 tipc_reset_bearer(net, b);
722 break;
723 case NETDEV_UNREGISTER:
724 case NETDEV_CHANGENAME:
725 bearer_disable(net, b);
726 break;
727 }
728 return NOTIFY_OK;
729 }
730
731 static struct notifier_block notifier = {
732 .notifier_call = tipc_l2_device_event,
733 .priority = 0,
734 };
735
tipc_bearer_setup(void)736 int tipc_bearer_setup(void)
737 {
738 return register_netdevice_notifier(¬ifier);
739 }
740
tipc_bearer_cleanup(void)741 void tipc_bearer_cleanup(void)
742 {
743 unregister_netdevice_notifier(¬ifier);
744 }
745
tipc_bearer_stop(struct net * net)746 void tipc_bearer_stop(struct net *net)
747 {
748 struct tipc_net *tn = net_generic(net, tipc_net_id);
749 struct tipc_bearer *b;
750 u32 i;
751
752 for (i = 0; i < MAX_BEARERS; i++) {
753 b = rtnl_dereference(tn->bearer_list[i]);
754 if (b) {
755 bearer_disable(net, b);
756 tn->bearer_list[i] = NULL;
757 }
758 }
759 }
760
tipc_clone_to_loopback(struct net * net,struct sk_buff_head * pkts)761 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
762 {
763 struct net_device *dev = net->loopback_dev;
764 struct sk_buff *skb, *_skb;
765 int exp;
766
767 skb_queue_walk(pkts, _skb) {
768 skb = pskb_copy(_skb, GFP_ATOMIC);
769 if (!skb)
770 continue;
771
772 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
773 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
774 kfree_skb(skb);
775 continue;
776 }
777
778 skb_reset_network_header(skb);
779 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
780 dev->dev_addr, skb->len);
781 skb->dev = dev;
782 skb->pkt_type = PACKET_HOST;
783 skb->ip_summed = CHECKSUM_UNNECESSARY;
784 skb->protocol = eth_type_trans(skb, dev);
785 netif_rx(skb);
786 }
787 }
788
tipc_loopback_rcv_pkt(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * od)789 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
790 struct packet_type *pt, struct net_device *od)
791 {
792 consume_skb(skb);
793 return NET_RX_SUCCESS;
794 }
795
tipc_attach_loopback(struct net * net)796 int tipc_attach_loopback(struct net *net)
797 {
798 struct net_device *dev = net->loopback_dev;
799 struct tipc_net *tn = tipc_net(net);
800
801 if (!dev)
802 return -ENODEV;
803
804 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
805 tn->loopback_pt.dev = dev;
806 tn->loopback_pt.type = htons(ETH_P_TIPC);
807 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
808 dev_add_pack(&tn->loopback_pt);
809 return 0;
810 }
811
tipc_detach_loopback(struct net * net)812 void tipc_detach_loopback(struct net *net)
813 {
814 struct tipc_net *tn = tipc_net(net);
815
816 dev_remove_pack(&tn->loopback_pt);
817 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker);
818 }
819
820 /* Caller should hold rtnl_lock to protect the bearer */
__tipc_nl_add_bearer(struct tipc_nl_msg * msg,struct tipc_bearer * bearer,int nlflags)821 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
822 struct tipc_bearer *bearer, int nlflags)
823 {
824 void *hdr;
825 struct nlattr *attrs;
826 struct nlattr *prop;
827
828 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
829 nlflags, TIPC_NL_BEARER_GET);
830 if (!hdr)
831 return -EMSGSIZE;
832
833 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
834 if (!attrs)
835 goto msg_full;
836
837 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
838 goto attr_msg_full;
839
840 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
841 if (!prop)
842 goto prop_msg_full;
843 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
844 goto prop_msg_full;
845 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
846 goto prop_msg_full;
847 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
848 goto prop_msg_full;
849 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
850 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
851 goto prop_msg_full;
852
853 nla_nest_end(msg->skb, prop);
854
855 #ifdef CONFIG_TIPC_MEDIA_UDP
856 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
857 if (tipc_udp_nl_add_bearer_data(msg, bearer))
858 goto attr_msg_full;
859 }
860 #endif
861
862 nla_nest_end(msg->skb, attrs);
863 genlmsg_end(msg->skb, hdr);
864
865 return 0;
866
867 prop_msg_full:
868 nla_nest_cancel(msg->skb, prop);
869 attr_msg_full:
870 nla_nest_cancel(msg->skb, attrs);
871 msg_full:
872 genlmsg_cancel(msg->skb, hdr);
873
874 return -EMSGSIZE;
875 }
876
tipc_nl_bearer_dump(struct sk_buff * skb,struct netlink_callback * cb)877 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
878 {
879 int err;
880 int i = cb->args[0];
881 struct tipc_bearer *bearer;
882 struct tipc_nl_msg msg;
883 struct net *net = sock_net(skb->sk);
884 struct tipc_net *tn = net_generic(net, tipc_net_id);
885
886 if (i == MAX_BEARERS)
887 return 0;
888
889 msg.skb = skb;
890 msg.portid = NETLINK_CB(cb->skb).portid;
891 msg.seq = cb->nlh->nlmsg_seq;
892
893 rtnl_lock();
894 for (i = 0; i < MAX_BEARERS; i++) {
895 bearer = rtnl_dereference(tn->bearer_list[i]);
896 if (!bearer)
897 continue;
898
899 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
900 if (err)
901 break;
902 }
903 rtnl_unlock();
904
905 cb->args[0] = i;
906 return skb->len;
907 }
908
tipc_nl_bearer_get(struct sk_buff * skb,struct genl_info * info)909 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
910 {
911 int err;
912 char *name;
913 struct sk_buff *rep;
914 struct tipc_bearer *bearer;
915 struct tipc_nl_msg msg;
916 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
917 struct net *net = genl_info_net(info);
918
919 if (!info->attrs[TIPC_NLA_BEARER])
920 return -EINVAL;
921
922 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
923 info->attrs[TIPC_NLA_BEARER],
924 tipc_nl_bearer_policy, info->extack);
925 if (err)
926 return err;
927
928 if (!attrs[TIPC_NLA_BEARER_NAME])
929 return -EINVAL;
930 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
931
932 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
933 if (!rep)
934 return -ENOMEM;
935
936 msg.skb = rep;
937 msg.portid = info->snd_portid;
938 msg.seq = info->snd_seq;
939
940 rtnl_lock();
941 bearer = tipc_bearer_find(net, name);
942 if (!bearer) {
943 err = -EINVAL;
944 NL_SET_ERR_MSG(info->extack, "Bearer not found");
945 goto err_out;
946 }
947
948 err = __tipc_nl_add_bearer(&msg, bearer, 0);
949 if (err)
950 goto err_out;
951 rtnl_unlock();
952
953 return genlmsg_reply(rep, info);
954 err_out:
955 rtnl_unlock();
956 nlmsg_free(rep);
957
958 return err;
959 }
960
__tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)961 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
962 {
963 int err;
964 char *name;
965 struct tipc_bearer *bearer;
966 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
967 struct net *net = sock_net(skb->sk);
968
969 if (!info->attrs[TIPC_NLA_BEARER])
970 return -EINVAL;
971
972 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
973 info->attrs[TIPC_NLA_BEARER],
974 tipc_nl_bearer_policy, info->extack);
975 if (err)
976 return err;
977
978 if (!attrs[TIPC_NLA_BEARER_NAME])
979 return -EINVAL;
980
981 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
982
983 bearer = tipc_bearer_find(net, name);
984 if (!bearer) {
985 NL_SET_ERR_MSG(info->extack, "Bearer not found");
986 return -EINVAL;
987 }
988
989 bearer_disable(net, bearer);
990
991 return 0;
992 }
993
tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)994 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
995 {
996 int err;
997
998 rtnl_lock();
999 err = __tipc_nl_bearer_disable(skb, info);
1000 rtnl_unlock();
1001
1002 return err;
1003 }
1004
__tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)1005 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1006 {
1007 int err;
1008 char *bearer;
1009 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1010 struct net *net = sock_net(skb->sk);
1011 u32 domain = 0;
1012 u32 prio;
1013
1014 prio = TIPC_MEDIA_LINK_PRI;
1015
1016 if (!info->attrs[TIPC_NLA_BEARER])
1017 return -EINVAL;
1018
1019 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1020 info->attrs[TIPC_NLA_BEARER],
1021 tipc_nl_bearer_policy, info->extack);
1022 if (err)
1023 return err;
1024
1025 if (!attrs[TIPC_NLA_BEARER_NAME])
1026 return -EINVAL;
1027
1028 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1029
1030 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1031 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1032
1033 if (attrs[TIPC_NLA_BEARER_PROP]) {
1034 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1035
1036 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1037 props);
1038 if (err)
1039 return err;
1040
1041 if (props[TIPC_NLA_PROP_PRIO])
1042 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1043 }
1044
1045 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1046 info->extack);
1047 }
1048
tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)1049 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1050 {
1051 int err;
1052
1053 rtnl_lock();
1054 err = __tipc_nl_bearer_enable(skb, info);
1055 rtnl_unlock();
1056
1057 return err;
1058 }
1059
tipc_nl_bearer_add(struct sk_buff * skb,struct genl_info * info)1060 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1061 {
1062 int err;
1063 char *name;
1064 struct tipc_bearer *b;
1065 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1066 struct net *net = sock_net(skb->sk);
1067
1068 if (!info->attrs[TIPC_NLA_BEARER])
1069 return -EINVAL;
1070
1071 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1072 info->attrs[TIPC_NLA_BEARER],
1073 tipc_nl_bearer_policy, info->extack);
1074 if (err)
1075 return err;
1076
1077 if (!attrs[TIPC_NLA_BEARER_NAME])
1078 return -EINVAL;
1079 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1080
1081 rtnl_lock();
1082 b = tipc_bearer_find(net, name);
1083 if (!b) {
1084 rtnl_unlock();
1085 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1086 return -EINVAL;
1087 }
1088
1089 #ifdef CONFIG_TIPC_MEDIA_UDP
1090 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1091 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1092 rtnl_unlock();
1093 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1094 return -EINVAL;
1095 }
1096
1097 err = tipc_udp_nl_bearer_add(b,
1098 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1099 if (err) {
1100 rtnl_unlock();
1101 return err;
1102 }
1103 }
1104 #endif
1105 rtnl_unlock();
1106
1107 return 0;
1108 }
1109
__tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1110 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1111 {
1112 struct tipc_bearer *b;
1113 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1114 struct net *net = sock_net(skb->sk);
1115 char *name;
1116 int err;
1117
1118 if (!info->attrs[TIPC_NLA_BEARER])
1119 return -EINVAL;
1120
1121 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1122 info->attrs[TIPC_NLA_BEARER],
1123 tipc_nl_bearer_policy, info->extack);
1124 if (err)
1125 return err;
1126
1127 if (!attrs[TIPC_NLA_BEARER_NAME])
1128 return -EINVAL;
1129 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1130
1131 b = tipc_bearer_find(net, name);
1132 if (!b) {
1133 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1134 return -EINVAL;
1135 }
1136
1137 if (attrs[TIPC_NLA_BEARER_PROP]) {
1138 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1139
1140 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1141 props);
1142 if (err)
1143 return err;
1144
1145 if (props[TIPC_NLA_PROP_TOL]) {
1146 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1147 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1148 }
1149 if (props[TIPC_NLA_PROP_PRIO])
1150 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1151 if (props[TIPC_NLA_PROP_WIN])
1152 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1153 if (props[TIPC_NLA_PROP_MTU]) {
1154 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1155 NL_SET_ERR_MSG(info->extack,
1156 "MTU property is unsupported");
1157 return -EINVAL;
1158 }
1159 #ifdef CONFIG_TIPC_MEDIA_UDP
1160 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1161 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1162 NL_SET_ERR_MSG(info->extack,
1163 "MTU value is out-of-range");
1164 return -EINVAL;
1165 }
1166 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1167 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1168 #endif
1169 }
1170 }
1171
1172 return 0;
1173 }
1174
tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1175 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1176 {
1177 int err;
1178
1179 rtnl_lock();
1180 err = __tipc_nl_bearer_set(skb, info);
1181 rtnl_unlock();
1182
1183 return err;
1184 }
1185
__tipc_nl_add_media(struct tipc_nl_msg * msg,struct tipc_media * media,int nlflags)1186 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1187 struct tipc_media *media, int nlflags)
1188 {
1189 void *hdr;
1190 struct nlattr *attrs;
1191 struct nlattr *prop;
1192
1193 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1194 nlflags, TIPC_NL_MEDIA_GET);
1195 if (!hdr)
1196 return -EMSGSIZE;
1197
1198 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1199 if (!attrs)
1200 goto msg_full;
1201
1202 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1203 goto attr_msg_full;
1204
1205 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1206 if (!prop)
1207 goto prop_msg_full;
1208 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1209 goto prop_msg_full;
1210 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1211 goto prop_msg_full;
1212 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1213 goto prop_msg_full;
1214 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1215 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1216 goto prop_msg_full;
1217
1218 nla_nest_end(msg->skb, prop);
1219 nla_nest_end(msg->skb, attrs);
1220 genlmsg_end(msg->skb, hdr);
1221
1222 return 0;
1223
1224 prop_msg_full:
1225 nla_nest_cancel(msg->skb, prop);
1226 attr_msg_full:
1227 nla_nest_cancel(msg->skb, attrs);
1228 msg_full:
1229 genlmsg_cancel(msg->skb, hdr);
1230
1231 return -EMSGSIZE;
1232 }
1233
tipc_nl_media_dump(struct sk_buff * skb,struct netlink_callback * cb)1234 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1235 {
1236 int err;
1237 int i = cb->args[0];
1238 struct tipc_nl_msg msg;
1239
1240 if (i == MAX_MEDIA)
1241 return 0;
1242
1243 msg.skb = skb;
1244 msg.portid = NETLINK_CB(cb->skb).portid;
1245 msg.seq = cb->nlh->nlmsg_seq;
1246
1247 rtnl_lock();
1248 for (; media_info_array[i] != NULL; i++) {
1249 err = __tipc_nl_add_media(&msg, media_info_array[i],
1250 NLM_F_MULTI);
1251 if (err)
1252 break;
1253 }
1254 rtnl_unlock();
1255
1256 cb->args[0] = i;
1257 return skb->len;
1258 }
1259
tipc_nl_media_get(struct sk_buff * skb,struct genl_info * info)1260 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1261 {
1262 int err;
1263 char *name;
1264 struct tipc_nl_msg msg;
1265 struct tipc_media *media;
1266 struct sk_buff *rep;
1267 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1268
1269 if (!info->attrs[TIPC_NLA_MEDIA])
1270 return -EINVAL;
1271
1272 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1273 info->attrs[TIPC_NLA_MEDIA],
1274 tipc_nl_media_policy, info->extack);
1275 if (err)
1276 return err;
1277
1278 if (!attrs[TIPC_NLA_MEDIA_NAME])
1279 return -EINVAL;
1280 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1281
1282 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1283 if (!rep)
1284 return -ENOMEM;
1285
1286 msg.skb = rep;
1287 msg.portid = info->snd_portid;
1288 msg.seq = info->snd_seq;
1289
1290 rtnl_lock();
1291 media = tipc_media_find(name);
1292 if (!media) {
1293 NL_SET_ERR_MSG(info->extack, "Media not found");
1294 err = -EINVAL;
1295 goto err_out;
1296 }
1297
1298 err = __tipc_nl_add_media(&msg, media, 0);
1299 if (err)
1300 goto err_out;
1301 rtnl_unlock();
1302
1303 return genlmsg_reply(rep, info);
1304 err_out:
1305 rtnl_unlock();
1306 nlmsg_free(rep);
1307
1308 return err;
1309 }
1310
__tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1311 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1312 {
1313 int err;
1314 char *name;
1315 struct tipc_media *m;
1316 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1317
1318 if (!info->attrs[TIPC_NLA_MEDIA])
1319 return -EINVAL;
1320
1321 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1322 info->attrs[TIPC_NLA_MEDIA],
1323 tipc_nl_media_policy, info->extack);
1324
1325 if (!attrs[TIPC_NLA_MEDIA_NAME])
1326 return -EINVAL;
1327 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1328
1329 m = tipc_media_find(name);
1330 if (!m) {
1331 NL_SET_ERR_MSG(info->extack, "Media not found");
1332 return -EINVAL;
1333 }
1334 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1335 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1336
1337 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1338 props);
1339 if (err)
1340 return err;
1341
1342 if (props[TIPC_NLA_PROP_TOL])
1343 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1344 if (props[TIPC_NLA_PROP_PRIO])
1345 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1346 if (props[TIPC_NLA_PROP_WIN])
1347 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1348 if (props[TIPC_NLA_PROP_MTU]) {
1349 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1350 NL_SET_ERR_MSG(info->extack,
1351 "MTU property is unsupported");
1352 return -EINVAL;
1353 }
1354 #ifdef CONFIG_TIPC_MEDIA_UDP
1355 if (tipc_udp_mtu_bad(nla_get_u32
1356 (props[TIPC_NLA_PROP_MTU]))) {
1357 NL_SET_ERR_MSG(info->extack,
1358 "MTU value is out-of-range");
1359 return -EINVAL;
1360 }
1361 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1362 #endif
1363 }
1364 }
1365
1366 return 0;
1367 }
1368
tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1369 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1370 {
1371 int err;
1372
1373 rtnl_lock();
1374 err = __tipc_nl_media_set(skb, info);
1375 rtnl_unlock();
1376
1377 return err;
1378 }
1379