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 if (strscpy(name_parts->media_name, media_name,
167 TIPC_MAX_MEDIA_NAME) < 0)
168 return 0;
169 if (strscpy(name_parts->if_name, if_name,
170 TIPC_MAX_IF_NAME) < 0)
171 return 0;
172 }
173 return 1;
174 }
175
176 /**
177 * tipc_bearer_find - locates bearer object with matching bearer name
178 * @net: the applicable net namespace
179 * @name: bearer name to locate
180 */
tipc_bearer_find(struct net * net,const char * name)181 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
182 {
183 struct tipc_net *tn = tipc_net(net);
184 struct tipc_bearer *b;
185 u32 i;
186
187 for (i = 0; i < MAX_BEARERS; i++) {
188 b = rtnl_dereference(tn->bearer_list[i]);
189 if (b && (!strcmp(b->name, name)))
190 return b;
191 }
192 return NULL;
193 }
194
195 /* tipc_bearer_get_name - get the bearer name from its id.
196 * @net: network namespace
197 * @name: a pointer to the buffer where the name will be stored.
198 * @bearer_id: the id to get the name from.
199 */
tipc_bearer_get_name(struct net * net,char * name,u32 bearer_id)200 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
201 {
202 struct tipc_net *tn = tipc_net(net);
203 struct tipc_bearer *b;
204
205 if (bearer_id >= MAX_BEARERS)
206 return -EINVAL;
207
208 b = rtnl_dereference(tn->bearer_list[bearer_id]);
209 if (!b)
210 return -EINVAL;
211
212 strcpy(name, b->name);
213 return 0;
214 }
215
tipc_bearer_add_dest(struct net * net,u32 bearer_id,u32 dest)216 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
217 {
218 struct tipc_bearer *b;
219
220 rcu_read_lock();
221 b = bearer_get(net, bearer_id);
222 if (b)
223 tipc_disc_add_dest(b->disc);
224 rcu_read_unlock();
225 }
226
tipc_bearer_remove_dest(struct net * net,u32 bearer_id,u32 dest)227 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
228 {
229 struct tipc_bearer *b;
230
231 rcu_read_lock();
232 b = bearer_get(net, bearer_id);
233 if (b)
234 tipc_disc_remove_dest(b->disc);
235 rcu_read_unlock();
236 }
237
238 /**
239 * tipc_enable_bearer - enable bearer with the given name
240 * @net: the applicable net namespace
241 * @name: bearer name to enable
242 * @disc_domain: bearer domain
243 * @prio: bearer priority
244 * @attr: nlattr array
245 * @extack: netlink extended ack
246 */
tipc_enable_bearer(struct net * net,const char * name,u32 disc_domain,u32 prio,struct nlattr * attr[],struct netlink_ext_ack * extack)247 static int tipc_enable_bearer(struct net *net, const char *name,
248 u32 disc_domain, u32 prio,
249 struct nlattr *attr[],
250 struct netlink_ext_ack *extack)
251 {
252 struct tipc_net *tn = tipc_net(net);
253 struct tipc_bearer_names b_names;
254 int with_this_prio = 1;
255 struct tipc_bearer *b;
256 struct tipc_media *m;
257 struct sk_buff *skb;
258 int bearer_id = 0;
259 int res = -EINVAL;
260 char *errstr = "";
261 u32 i;
262
263 if (!bearer_name_validate(name, &b_names)) {
264 NL_SET_ERR_MSG(extack, "Illegal name");
265 return res;
266 }
267
268 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
269 errstr = "illegal priority";
270 NL_SET_ERR_MSG(extack, "Illegal priority");
271 goto rejected;
272 }
273
274 m = tipc_media_find(b_names.media_name);
275 if (!m) {
276 errstr = "media not registered";
277 NL_SET_ERR_MSG(extack, "Media not registered");
278 goto rejected;
279 }
280
281 if (prio == TIPC_MEDIA_LINK_PRI)
282 prio = m->priority;
283
284 /* Check new bearer vs existing ones and find free bearer id if any */
285 bearer_id = MAX_BEARERS;
286 i = MAX_BEARERS;
287 while (i-- != 0) {
288 b = rtnl_dereference(tn->bearer_list[i]);
289 if (!b) {
290 bearer_id = i;
291 continue;
292 }
293 if (!strcmp(name, b->name)) {
294 errstr = "already enabled";
295 NL_SET_ERR_MSG(extack, "Already enabled");
296 goto rejected;
297 }
298
299 if (b->priority == prio &&
300 (++with_this_prio > 2)) {
301 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
302 name, prio);
303
304 if (prio == TIPC_MIN_LINK_PRI) {
305 errstr = "cannot adjust to lower";
306 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
307 goto rejected;
308 }
309
310 pr_warn("Bearer <%s>: trying with adjusted priority\n",
311 name);
312 prio--;
313 bearer_id = MAX_BEARERS;
314 i = MAX_BEARERS;
315 with_this_prio = 1;
316 }
317 }
318
319 if (bearer_id >= MAX_BEARERS) {
320 errstr = "max 3 bearers permitted";
321 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
322 goto rejected;
323 }
324
325 b = kzalloc(sizeof(*b), GFP_ATOMIC);
326 if (!b)
327 return -ENOMEM;
328
329 strcpy(b->name, name);
330 b->media = m;
331 res = m->enable_media(net, b, attr);
332 if (res) {
333 kfree(b);
334 errstr = "failed to enable media";
335 NL_SET_ERR_MSG(extack, "Failed to enable media");
336 goto rejected;
337 }
338
339 b->identity = bearer_id;
340 b->tolerance = m->tolerance;
341 b->min_win = m->min_win;
342 b->max_win = m->max_win;
343 b->domain = disc_domain;
344 b->net_plane = bearer_id + 'A';
345 b->priority = prio;
346 refcount_set(&b->refcnt, 1);
347
348 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
349 if (res) {
350 bearer_disable(net, b);
351 errstr = "failed to create discoverer";
352 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
353 goto rejected;
354 }
355
356 /* Create monitoring data before accepting activate messages */
357 if (tipc_mon_create(net, bearer_id)) {
358 bearer_disable(net, b);
359 kfree_skb(skb);
360 return -ENOMEM;
361 }
362
363 test_and_set_bit_lock(0, &b->up);
364 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
365 if (skb)
366 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
367
368 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
369
370 return res;
371 rejected:
372 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
373 return res;
374 }
375
376 /**
377 * tipc_reset_bearer - Reset all links established over this bearer
378 * @net: the applicable net namespace
379 * @b: the target bearer
380 */
tipc_reset_bearer(struct net * net,struct tipc_bearer * b)381 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
382 {
383 pr_info("Resetting bearer <%s>\n", b->name);
384 tipc_node_delete_links(net, b->identity);
385 tipc_disc_reset(net, b);
386 return 0;
387 }
388
tipc_bearer_hold(struct tipc_bearer * b)389 bool tipc_bearer_hold(struct tipc_bearer *b)
390 {
391 return (b && refcount_inc_not_zero(&b->refcnt));
392 }
393
tipc_bearer_put(struct tipc_bearer * b)394 void tipc_bearer_put(struct tipc_bearer *b)
395 {
396 if (b && refcount_dec_and_test(&b->refcnt))
397 kfree_rcu(b, rcu);
398 }
399
400 /**
401 * bearer_disable - disable this bearer
402 * @net: the applicable net namespace
403 * @b: the bearer to disable
404 *
405 * Note: This routine assumes caller holds RTNL lock.
406 */
bearer_disable(struct net * net,struct tipc_bearer * b)407 static void bearer_disable(struct net *net, struct tipc_bearer *b)
408 {
409 struct tipc_net *tn = tipc_net(net);
410 int bearer_id = b->identity;
411
412 pr_info("Disabling bearer <%s>\n", b->name);
413 clear_bit_unlock(0, &b->up);
414 tipc_node_delete_links(net, bearer_id);
415 b->media->disable_media(b);
416 RCU_INIT_POINTER(b->media_ptr, NULL);
417 if (b->disc)
418 tipc_disc_delete(b->disc);
419 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
420 tipc_bearer_put(b);
421 tipc_mon_delete(net, bearer_id);
422 }
423
tipc_enable_l2_media(struct net * net,struct tipc_bearer * b,struct nlattr * attr[])424 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
425 struct nlattr *attr[])
426 {
427 char *dev_name = strchr((const char *)b->name, ':') + 1;
428 int hwaddr_len = b->media->hwaddr_len;
429 u8 node_id[NODE_ID_LEN] = {0,};
430 struct net_device *dev;
431
432 /* Find device with specified name */
433 dev = dev_get_by_name(net, dev_name);
434 if (!dev)
435 return -ENODEV;
436 if (tipc_mtu_bad(dev)) {
437 dev_put(dev);
438 return -EINVAL;
439 }
440 if (dev == net->loopback_dev) {
441 dev_put(dev);
442 pr_info("Enabling <%s> not permitted\n", b->name);
443 return -EINVAL;
444 }
445
446 /* Autoconfigure own node identity if needed */
447 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
448 memcpy(node_id, dev->dev_addr, hwaddr_len);
449 tipc_net_init(net, node_id, 0);
450 }
451 if (!tipc_own_id(net)) {
452 dev_put(dev);
453 pr_warn("Failed to obtain node identity\n");
454 return -EINVAL;
455 }
456
457 /* Associate TIPC bearer with L2 bearer */
458 rcu_assign_pointer(b->media_ptr, dev);
459 b->pt.dev = dev;
460 b->pt.type = htons(ETH_P_TIPC);
461 b->pt.func = tipc_l2_rcv_msg;
462 dev_add_pack(&b->pt);
463 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
464 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
465 b->bcast_addr.media_id = b->media->type_id;
466 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
467 b->mtu = dev->mtu;
468 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
469 rcu_assign_pointer(dev->tipc_ptr, b);
470 return 0;
471 }
472
473 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
474 * @b: the target bearer
475 *
476 * Mark L2 bearer as inactive so that incoming buffers are thrown away
477 */
tipc_disable_l2_media(struct tipc_bearer * b)478 void tipc_disable_l2_media(struct tipc_bearer *b)
479 {
480 struct net_device *dev;
481
482 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
483 dev_remove_pack(&b->pt);
484 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
485 synchronize_net();
486 dev_put(dev);
487 }
488
489 /**
490 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
491 * @net: the associated network namespace
492 * @skb: the packet to be sent
493 * @b: the bearer through which the packet is to be sent
494 * @dest: peer destination address
495 */
tipc_l2_send_msg(struct net * net,struct sk_buff * skb,struct tipc_bearer * b,struct tipc_media_addr * dest)496 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
497 struct tipc_bearer *b, struct tipc_media_addr *dest)
498 {
499 struct net_device *dev;
500 int delta;
501
502 dev = (struct net_device *)rcu_dereference(b->media_ptr);
503 if (!dev)
504 return 0;
505
506 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
507 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
508 kfree_skb(skb);
509 return 0;
510 }
511 skb_reset_network_header(skb);
512 skb->dev = dev;
513 skb->protocol = htons(ETH_P_TIPC);
514 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
515 dev->dev_addr, skb->len);
516 dev_queue_xmit(skb);
517 return 0;
518 }
519
tipc_bearer_bcast_support(struct net * net,u32 bearer_id)520 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
521 {
522 bool supp = false;
523 struct tipc_bearer *b;
524
525 rcu_read_lock();
526 b = bearer_get(net, bearer_id);
527 if (b)
528 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
529 rcu_read_unlock();
530 return supp;
531 }
532
tipc_bearer_mtu(struct net * net,u32 bearer_id)533 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
534 {
535 int mtu = 0;
536 struct tipc_bearer *b;
537
538 rcu_read_lock();
539 b = bearer_get(net, bearer_id);
540 if (b)
541 mtu = b->mtu;
542 rcu_read_unlock();
543 return mtu;
544 }
545
tipc_bearer_min_mtu(struct net * net,u32 bearer_id)546 int tipc_bearer_min_mtu(struct net *net, u32 bearer_id)
547 {
548 int mtu = TIPC_MIN_BEARER_MTU;
549 struct tipc_bearer *b;
550
551 rcu_read_lock();
552 b = bearer_get(net, bearer_id);
553 if (b)
554 mtu += b->encap_hlen;
555 rcu_read_unlock();
556 return mtu;
557 }
558
559 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
560 */
tipc_bearer_xmit_skb(struct net * net,u32 bearer_id,struct sk_buff * skb,struct tipc_media_addr * dest)561 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
562 struct sk_buff *skb,
563 struct tipc_media_addr *dest)
564 {
565 struct tipc_msg *hdr = buf_msg(skb);
566 struct tipc_bearer *b;
567
568 rcu_read_lock();
569 b = bearer_get(net, bearer_id);
570 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
571 #ifdef CONFIG_TIPC_CRYPTO
572 tipc_crypto_xmit(net, &skb, b, dest, NULL);
573 if (skb)
574 #endif
575 b->media->send_msg(net, skb, b, dest);
576 } else {
577 kfree_skb(skb);
578 }
579 rcu_read_unlock();
580 }
581
582 /* tipc_bearer_xmit() -send buffer to destination over bearer
583 */
tipc_bearer_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq,struct tipc_media_addr * dst,struct tipc_node * __dnode)584 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
585 struct sk_buff_head *xmitq,
586 struct tipc_media_addr *dst,
587 struct tipc_node *__dnode)
588 {
589 struct tipc_bearer *b;
590 struct sk_buff *skb, *tmp;
591
592 if (skb_queue_empty(xmitq))
593 return;
594
595 rcu_read_lock();
596 b = bearer_get(net, bearer_id);
597 if (unlikely(!b))
598 __skb_queue_purge(xmitq);
599 skb_queue_walk_safe(xmitq, skb, tmp) {
600 __skb_dequeue(xmitq);
601 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
602 #ifdef CONFIG_TIPC_CRYPTO
603 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
604 if (skb)
605 #endif
606 b->media->send_msg(net, skb, b, dst);
607 } else {
608 kfree_skb(skb);
609 }
610 }
611 rcu_read_unlock();
612 }
613
614 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
615 */
tipc_bearer_bc_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq)616 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
617 struct sk_buff_head *xmitq)
618 {
619 struct tipc_net *tn = tipc_net(net);
620 struct tipc_media_addr *dst;
621 int net_id = tn->net_id;
622 struct tipc_bearer *b;
623 struct sk_buff *skb, *tmp;
624 struct tipc_msg *hdr;
625
626 rcu_read_lock();
627 b = bearer_get(net, bearer_id);
628 if (unlikely(!b || !test_bit(0, &b->up)))
629 __skb_queue_purge(xmitq);
630 skb_queue_walk_safe(xmitq, skb, tmp) {
631 hdr = buf_msg(skb);
632 msg_set_non_seq(hdr, 1);
633 msg_set_mc_netid(hdr, net_id);
634 __skb_dequeue(xmitq);
635 dst = &b->bcast_addr;
636 #ifdef CONFIG_TIPC_CRYPTO
637 tipc_crypto_xmit(net, &skb, b, dst, NULL);
638 if (skb)
639 #endif
640 b->media->send_msg(net, skb, b, dst);
641 }
642 rcu_read_unlock();
643 }
644
645 /**
646 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
647 * @skb: the received message
648 * @dev: the net device that the packet was received on
649 * @pt: the packet_type structure which was used to register this handler
650 * @orig_dev: the original receive net device in case the device is a bond
651 *
652 * Accept only packets explicitly sent to this node, or broadcast packets;
653 * ignores packets sent using interface multicast, and traffic sent to other
654 * nodes (which can happen if interface is running in promiscuous mode).
655 */
tipc_l2_rcv_msg(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)656 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
657 struct packet_type *pt, struct net_device *orig_dev)
658 {
659 struct tipc_bearer *b;
660
661 rcu_read_lock();
662 b = rcu_dereference(dev->tipc_ptr) ?:
663 rcu_dereference(orig_dev->tipc_ptr);
664 if (likely(b && test_bit(0, &b->up) &&
665 (skb->pkt_type <= PACKET_MULTICAST))) {
666 skb_mark_not_on_list(skb);
667 TIPC_SKB_CB(skb)->flags = 0;
668 tipc_rcv(dev_net(b->pt.dev), skb, b);
669 rcu_read_unlock();
670 return NET_RX_SUCCESS;
671 }
672 rcu_read_unlock();
673 kfree_skb(skb);
674 return NET_RX_DROP;
675 }
676
677 /**
678 * tipc_l2_device_event - handle device events from network device
679 * @nb: the context of the notification
680 * @evt: the type of event
681 * @ptr: the net device that the event was on
682 *
683 * This function is called by the Ethernet driver in case of link
684 * change event.
685 */
tipc_l2_device_event(struct notifier_block * nb,unsigned long evt,void * ptr)686 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
687 void *ptr)
688 {
689 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
690 struct net *net = dev_net(dev);
691 struct tipc_bearer *b;
692
693 b = rtnl_dereference(dev->tipc_ptr);
694 if (!b)
695 return NOTIFY_DONE;
696
697 trace_tipc_l2_device_event(dev, b, evt);
698 switch (evt) {
699 case NETDEV_CHANGE:
700 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
701 test_and_set_bit_lock(0, &b->up);
702 break;
703 }
704 fallthrough;
705 case NETDEV_GOING_DOWN:
706 clear_bit_unlock(0, &b->up);
707 tipc_reset_bearer(net, b);
708 break;
709 case NETDEV_UP:
710 test_and_set_bit_lock(0, &b->up);
711 break;
712 case NETDEV_CHANGEMTU:
713 if (tipc_mtu_bad(dev)) {
714 bearer_disable(net, b);
715 break;
716 }
717 b->mtu = dev->mtu;
718 tipc_reset_bearer(net, b);
719 break;
720 case NETDEV_CHANGEADDR:
721 b->media->raw2addr(b, &b->addr,
722 (const char *)dev->dev_addr);
723 tipc_reset_bearer(net, b);
724 break;
725 case NETDEV_UNREGISTER:
726 case NETDEV_CHANGENAME:
727 bearer_disable(net, b);
728 break;
729 }
730 return NOTIFY_OK;
731 }
732
733 static struct notifier_block notifier = {
734 .notifier_call = tipc_l2_device_event,
735 .priority = 0,
736 };
737
tipc_bearer_setup(void)738 int tipc_bearer_setup(void)
739 {
740 return register_netdevice_notifier(¬ifier);
741 }
742
tipc_bearer_cleanup(void)743 void tipc_bearer_cleanup(void)
744 {
745 unregister_netdevice_notifier(¬ifier);
746 }
747
tipc_bearer_stop(struct net * net)748 void tipc_bearer_stop(struct net *net)
749 {
750 struct tipc_net *tn = tipc_net(net);
751 struct tipc_bearer *b;
752 u32 i;
753
754 for (i = 0; i < MAX_BEARERS; i++) {
755 b = rtnl_dereference(tn->bearer_list[i]);
756 if (b) {
757 bearer_disable(net, b);
758 tn->bearer_list[i] = NULL;
759 }
760 }
761 }
762
tipc_clone_to_loopback(struct net * net,struct sk_buff_head * pkts)763 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
764 {
765 struct net_device *dev = net->loopback_dev;
766 struct sk_buff *skb, *_skb;
767 int exp;
768
769 skb_queue_walk(pkts, _skb) {
770 skb = pskb_copy(_skb, GFP_ATOMIC);
771 if (!skb)
772 continue;
773
774 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
775 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
776 kfree_skb(skb);
777 continue;
778 }
779
780 skb_reset_network_header(skb);
781 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
782 dev->dev_addr, skb->len);
783 skb->dev = dev;
784 skb->pkt_type = PACKET_HOST;
785 skb->ip_summed = CHECKSUM_UNNECESSARY;
786 skb->protocol = eth_type_trans(skb, dev);
787 netif_rx(skb);
788 }
789 }
790
tipc_loopback_rcv_pkt(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * od)791 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
792 struct packet_type *pt, struct net_device *od)
793 {
794 consume_skb(skb);
795 return NET_RX_SUCCESS;
796 }
797
tipc_attach_loopback(struct net * net)798 int tipc_attach_loopback(struct net *net)
799 {
800 struct net_device *dev = net->loopback_dev;
801 struct tipc_net *tn = tipc_net(net);
802
803 if (!dev)
804 return -ENODEV;
805
806 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
807 tn->loopback_pt.dev = dev;
808 tn->loopback_pt.type = htons(ETH_P_TIPC);
809 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
810 dev_add_pack(&tn->loopback_pt);
811 return 0;
812 }
813
tipc_detach_loopback(struct net * net)814 void tipc_detach_loopback(struct net *net)
815 {
816 struct tipc_net *tn = tipc_net(net);
817
818 dev_remove_pack(&tn->loopback_pt);
819 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker);
820 }
821
822 /* Caller should hold rtnl_lock to protect the bearer */
__tipc_nl_add_bearer(struct tipc_nl_msg * msg,struct tipc_bearer * bearer,int nlflags)823 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
824 struct tipc_bearer *bearer, int nlflags)
825 {
826 void *hdr;
827 struct nlattr *attrs;
828 struct nlattr *prop;
829
830 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
831 nlflags, TIPC_NL_BEARER_GET);
832 if (!hdr)
833 return -EMSGSIZE;
834
835 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
836 if (!attrs)
837 goto msg_full;
838
839 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
840 goto attr_msg_full;
841
842 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
843 if (!prop)
844 goto prop_msg_full;
845 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
846 goto prop_msg_full;
847 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
848 goto prop_msg_full;
849 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
850 goto prop_msg_full;
851 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
852 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
853 goto prop_msg_full;
854
855 nla_nest_end(msg->skb, prop);
856
857 #ifdef CONFIG_TIPC_MEDIA_UDP
858 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
859 if (tipc_udp_nl_add_bearer_data(msg, bearer))
860 goto attr_msg_full;
861 }
862 #endif
863
864 nla_nest_end(msg->skb, attrs);
865 genlmsg_end(msg->skb, hdr);
866
867 return 0;
868
869 prop_msg_full:
870 nla_nest_cancel(msg->skb, prop);
871 attr_msg_full:
872 nla_nest_cancel(msg->skb, attrs);
873 msg_full:
874 genlmsg_cancel(msg->skb, hdr);
875
876 return -EMSGSIZE;
877 }
878
tipc_nl_bearer_dump(struct sk_buff * skb,struct netlink_callback * cb)879 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
880 {
881 int err;
882 int i = cb->args[0];
883 struct tipc_bearer *bearer;
884 struct tipc_nl_msg msg;
885 struct net *net = sock_net(skb->sk);
886 struct tipc_net *tn = tipc_net(net);
887
888 if (i == MAX_BEARERS)
889 return 0;
890
891 msg.skb = skb;
892 msg.portid = NETLINK_CB(cb->skb).portid;
893 msg.seq = cb->nlh->nlmsg_seq;
894
895 rtnl_lock();
896 for (i = 0; i < MAX_BEARERS; i++) {
897 bearer = rtnl_dereference(tn->bearer_list[i]);
898 if (!bearer)
899 continue;
900
901 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
902 if (err)
903 break;
904 }
905 rtnl_unlock();
906
907 cb->args[0] = i;
908 return skb->len;
909 }
910
tipc_nl_bearer_get(struct sk_buff * skb,struct genl_info * info)911 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
912 {
913 int err;
914 char *name;
915 struct sk_buff *rep;
916 struct tipc_bearer *bearer;
917 struct tipc_nl_msg msg;
918 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
919 struct net *net = genl_info_net(info);
920
921 if (!info->attrs[TIPC_NLA_BEARER])
922 return -EINVAL;
923
924 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
925 info->attrs[TIPC_NLA_BEARER],
926 tipc_nl_bearer_policy, info->extack);
927 if (err)
928 return err;
929
930 if (!attrs[TIPC_NLA_BEARER_NAME])
931 return -EINVAL;
932 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
933
934 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
935 if (!rep)
936 return -ENOMEM;
937
938 msg.skb = rep;
939 msg.portid = info->snd_portid;
940 msg.seq = info->snd_seq;
941
942 rtnl_lock();
943 bearer = tipc_bearer_find(net, name);
944 if (!bearer) {
945 err = -EINVAL;
946 NL_SET_ERR_MSG(info->extack, "Bearer not found");
947 goto err_out;
948 }
949
950 err = __tipc_nl_add_bearer(&msg, bearer, 0);
951 if (err)
952 goto err_out;
953 rtnl_unlock();
954
955 return genlmsg_reply(rep, info);
956 err_out:
957 rtnl_unlock();
958 nlmsg_free(rep);
959
960 return err;
961 }
962
__tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)963 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
964 {
965 int err;
966 char *name;
967 struct tipc_bearer *bearer;
968 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
969 struct net *net = sock_net(skb->sk);
970
971 if (!info->attrs[TIPC_NLA_BEARER])
972 return -EINVAL;
973
974 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
975 info->attrs[TIPC_NLA_BEARER],
976 tipc_nl_bearer_policy, info->extack);
977 if (err)
978 return err;
979
980 if (!attrs[TIPC_NLA_BEARER_NAME])
981 return -EINVAL;
982
983 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
984
985 bearer = tipc_bearer_find(net, name);
986 if (!bearer) {
987 NL_SET_ERR_MSG(info->extack, "Bearer not found");
988 return -EINVAL;
989 }
990
991 bearer_disable(net, bearer);
992
993 return 0;
994 }
995
tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)996 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
997 {
998 int err;
999
1000 rtnl_lock();
1001 err = __tipc_nl_bearer_disable(skb, info);
1002 rtnl_unlock();
1003
1004 return err;
1005 }
1006
__tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)1007 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1008 {
1009 int err;
1010 char *bearer;
1011 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1012 struct net *net = sock_net(skb->sk);
1013 u32 domain = 0;
1014 u32 prio;
1015
1016 prio = TIPC_MEDIA_LINK_PRI;
1017
1018 if (!info->attrs[TIPC_NLA_BEARER])
1019 return -EINVAL;
1020
1021 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1022 info->attrs[TIPC_NLA_BEARER],
1023 tipc_nl_bearer_policy, info->extack);
1024 if (err)
1025 return err;
1026
1027 if (!attrs[TIPC_NLA_BEARER_NAME])
1028 return -EINVAL;
1029
1030 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1031
1032 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1033 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1034
1035 if (attrs[TIPC_NLA_BEARER_PROP]) {
1036 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1037
1038 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1039 props);
1040 if (err)
1041 return err;
1042
1043 if (props[TIPC_NLA_PROP_PRIO])
1044 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1045 }
1046
1047 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1048 info->extack);
1049 }
1050
tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)1051 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1052 {
1053 int err;
1054
1055 rtnl_lock();
1056 err = __tipc_nl_bearer_enable(skb, info);
1057 rtnl_unlock();
1058
1059 return err;
1060 }
1061
tipc_nl_bearer_add(struct sk_buff * skb,struct genl_info * info)1062 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1063 {
1064 int err;
1065 char *name;
1066 struct tipc_bearer *b;
1067 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1068 struct net *net = sock_net(skb->sk);
1069
1070 if (!info->attrs[TIPC_NLA_BEARER])
1071 return -EINVAL;
1072
1073 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1074 info->attrs[TIPC_NLA_BEARER],
1075 tipc_nl_bearer_policy, info->extack);
1076 if (err)
1077 return err;
1078
1079 if (!attrs[TIPC_NLA_BEARER_NAME])
1080 return -EINVAL;
1081 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1082
1083 rtnl_lock();
1084 b = tipc_bearer_find(net, name);
1085 if (!b) {
1086 rtnl_unlock();
1087 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1088 return -EINVAL;
1089 }
1090
1091 #ifdef CONFIG_TIPC_MEDIA_UDP
1092 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1093 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1094 rtnl_unlock();
1095 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1096 return -EINVAL;
1097 }
1098
1099 err = tipc_udp_nl_bearer_add(b,
1100 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1101 if (err) {
1102 rtnl_unlock();
1103 return err;
1104 }
1105 }
1106 #endif
1107 rtnl_unlock();
1108
1109 return 0;
1110 }
1111
__tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1112 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1113 {
1114 struct tipc_bearer *b;
1115 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1116 struct net *net = sock_net(skb->sk);
1117 char *name;
1118 int err;
1119
1120 if (!info->attrs[TIPC_NLA_BEARER])
1121 return -EINVAL;
1122
1123 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1124 info->attrs[TIPC_NLA_BEARER],
1125 tipc_nl_bearer_policy, info->extack);
1126 if (err)
1127 return err;
1128
1129 if (!attrs[TIPC_NLA_BEARER_NAME])
1130 return -EINVAL;
1131 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1132
1133 b = tipc_bearer_find(net, name);
1134 if (!b) {
1135 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1136 return -EINVAL;
1137 }
1138
1139 if (attrs[TIPC_NLA_BEARER_PROP]) {
1140 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1141
1142 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1143 props);
1144 if (err)
1145 return err;
1146
1147 if (props[TIPC_NLA_PROP_TOL]) {
1148 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1149 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1150 }
1151 if (props[TIPC_NLA_PROP_PRIO])
1152 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1153 if (props[TIPC_NLA_PROP_WIN])
1154 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1155 if (props[TIPC_NLA_PROP_MTU]) {
1156 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1157 NL_SET_ERR_MSG(info->extack,
1158 "MTU property is unsupported");
1159 return -EINVAL;
1160 }
1161 #ifdef CONFIG_TIPC_MEDIA_UDP
1162 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1163 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1164 NL_SET_ERR_MSG(info->extack,
1165 "MTU value is out-of-range");
1166 return -EINVAL;
1167 }
1168 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1169 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1170 #endif
1171 }
1172 }
1173
1174 return 0;
1175 }
1176
tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1177 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1178 {
1179 int err;
1180
1181 rtnl_lock();
1182 err = __tipc_nl_bearer_set(skb, info);
1183 rtnl_unlock();
1184
1185 return err;
1186 }
1187
__tipc_nl_add_media(struct tipc_nl_msg * msg,struct tipc_media * media,int nlflags)1188 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1189 struct tipc_media *media, int nlflags)
1190 {
1191 void *hdr;
1192 struct nlattr *attrs;
1193 struct nlattr *prop;
1194
1195 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1196 nlflags, TIPC_NL_MEDIA_GET);
1197 if (!hdr)
1198 return -EMSGSIZE;
1199
1200 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1201 if (!attrs)
1202 goto msg_full;
1203
1204 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1205 goto attr_msg_full;
1206
1207 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1208 if (!prop)
1209 goto prop_msg_full;
1210 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1211 goto prop_msg_full;
1212 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1213 goto prop_msg_full;
1214 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1215 goto prop_msg_full;
1216 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1217 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1218 goto prop_msg_full;
1219
1220 nla_nest_end(msg->skb, prop);
1221 nla_nest_end(msg->skb, attrs);
1222 genlmsg_end(msg->skb, hdr);
1223
1224 return 0;
1225
1226 prop_msg_full:
1227 nla_nest_cancel(msg->skb, prop);
1228 attr_msg_full:
1229 nla_nest_cancel(msg->skb, attrs);
1230 msg_full:
1231 genlmsg_cancel(msg->skb, hdr);
1232
1233 return -EMSGSIZE;
1234 }
1235
tipc_nl_media_dump(struct sk_buff * skb,struct netlink_callback * cb)1236 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1237 {
1238 int err;
1239 int i = cb->args[0];
1240 struct tipc_nl_msg msg;
1241
1242 if (i == MAX_MEDIA)
1243 return 0;
1244
1245 msg.skb = skb;
1246 msg.portid = NETLINK_CB(cb->skb).portid;
1247 msg.seq = cb->nlh->nlmsg_seq;
1248
1249 rtnl_lock();
1250 for (; media_info_array[i] != NULL; i++) {
1251 err = __tipc_nl_add_media(&msg, media_info_array[i],
1252 NLM_F_MULTI);
1253 if (err)
1254 break;
1255 }
1256 rtnl_unlock();
1257
1258 cb->args[0] = i;
1259 return skb->len;
1260 }
1261
tipc_nl_media_get(struct sk_buff * skb,struct genl_info * info)1262 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1263 {
1264 int err;
1265 char *name;
1266 struct tipc_nl_msg msg;
1267 struct tipc_media *media;
1268 struct sk_buff *rep;
1269 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1270
1271 if (!info->attrs[TIPC_NLA_MEDIA])
1272 return -EINVAL;
1273
1274 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1275 info->attrs[TIPC_NLA_MEDIA],
1276 tipc_nl_media_policy, info->extack);
1277 if (err)
1278 return err;
1279
1280 if (!attrs[TIPC_NLA_MEDIA_NAME])
1281 return -EINVAL;
1282 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1283
1284 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1285 if (!rep)
1286 return -ENOMEM;
1287
1288 msg.skb = rep;
1289 msg.portid = info->snd_portid;
1290 msg.seq = info->snd_seq;
1291
1292 rtnl_lock();
1293 media = tipc_media_find(name);
1294 if (!media) {
1295 NL_SET_ERR_MSG(info->extack, "Media not found");
1296 err = -EINVAL;
1297 goto err_out;
1298 }
1299
1300 err = __tipc_nl_add_media(&msg, media, 0);
1301 if (err)
1302 goto err_out;
1303 rtnl_unlock();
1304
1305 return genlmsg_reply(rep, info);
1306 err_out:
1307 rtnl_unlock();
1308 nlmsg_free(rep);
1309
1310 return err;
1311 }
1312
__tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1313 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1314 {
1315 int err;
1316 char *name;
1317 struct tipc_media *m;
1318 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1319
1320 if (!info->attrs[TIPC_NLA_MEDIA])
1321 return -EINVAL;
1322
1323 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1324 info->attrs[TIPC_NLA_MEDIA],
1325 tipc_nl_media_policy, info->extack);
1326
1327 if (!attrs[TIPC_NLA_MEDIA_NAME])
1328 return -EINVAL;
1329 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1330
1331 m = tipc_media_find(name);
1332 if (!m) {
1333 NL_SET_ERR_MSG(info->extack, "Media not found");
1334 return -EINVAL;
1335 }
1336 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1337 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1338
1339 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1340 props);
1341 if (err)
1342 return err;
1343
1344 if (props[TIPC_NLA_PROP_TOL])
1345 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1346 if (props[TIPC_NLA_PROP_PRIO])
1347 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1348 if (props[TIPC_NLA_PROP_WIN])
1349 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1350 if (props[TIPC_NLA_PROP_MTU]) {
1351 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1352 NL_SET_ERR_MSG(info->extack,
1353 "MTU property is unsupported");
1354 return -EINVAL;
1355 }
1356 #ifdef CONFIG_TIPC_MEDIA_UDP
1357 if (tipc_udp_mtu_bad(nla_get_u32
1358 (props[TIPC_NLA_PROP_MTU]))) {
1359 NL_SET_ERR_MSG(info->extack,
1360 "MTU value is out-of-range");
1361 return -EINVAL;
1362 }
1363 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1364 #endif
1365 }
1366 }
1367
1368 return 0;
1369 }
1370
tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1371 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1372 {
1373 int err;
1374
1375 rtnl_lock();
1376 err = __tipc_nl_media_set(skb, info);
1377 rtnl_unlock();
1378
1379 return err;
1380 }
1381