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
544 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
545 */
tipc_bearer_xmit_skb(struct net * net,u32 bearer_id,struct sk_buff * skb,struct tipc_media_addr * dest)546 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
547 struct sk_buff *skb,
548 struct tipc_media_addr *dest)
549 {
550 struct tipc_msg *hdr = buf_msg(skb);
551 struct tipc_bearer *b;
552
553 rcu_read_lock();
554 b = bearer_get(net, bearer_id);
555 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
556 #ifdef CONFIG_TIPC_CRYPTO
557 tipc_crypto_xmit(net, &skb, b, dest, NULL);
558 if (skb)
559 #endif
560 b->media->send_msg(net, skb, b, dest);
561 } else {
562 kfree_skb(skb);
563 }
564 rcu_read_unlock();
565 }
566
567 /* tipc_bearer_xmit() -send buffer to destination over bearer
568 */
tipc_bearer_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq,struct tipc_media_addr * dst,struct tipc_node * __dnode)569 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
570 struct sk_buff_head *xmitq,
571 struct tipc_media_addr *dst,
572 struct tipc_node *__dnode)
573 {
574 struct tipc_bearer *b;
575 struct sk_buff *skb, *tmp;
576
577 if (skb_queue_empty(xmitq))
578 return;
579
580 rcu_read_lock();
581 b = bearer_get(net, bearer_id);
582 if (unlikely(!b))
583 __skb_queue_purge(xmitq);
584 skb_queue_walk_safe(xmitq, skb, tmp) {
585 __skb_dequeue(xmitq);
586 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
587 #ifdef CONFIG_TIPC_CRYPTO
588 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
589 if (skb)
590 #endif
591 b->media->send_msg(net, skb, b, dst);
592 } else {
593 kfree_skb(skb);
594 }
595 }
596 rcu_read_unlock();
597 }
598
599 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
600 */
tipc_bearer_bc_xmit(struct net * net,u32 bearer_id,struct sk_buff_head * xmitq)601 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
602 struct sk_buff_head *xmitq)
603 {
604 struct tipc_net *tn = tipc_net(net);
605 struct tipc_media_addr *dst;
606 int net_id = tn->net_id;
607 struct tipc_bearer *b;
608 struct sk_buff *skb, *tmp;
609 struct tipc_msg *hdr;
610
611 rcu_read_lock();
612 b = bearer_get(net, bearer_id);
613 if (unlikely(!b || !test_bit(0, &b->up)))
614 __skb_queue_purge(xmitq);
615 skb_queue_walk_safe(xmitq, skb, tmp) {
616 hdr = buf_msg(skb);
617 msg_set_non_seq(hdr, 1);
618 msg_set_mc_netid(hdr, net_id);
619 __skb_dequeue(xmitq);
620 dst = &b->bcast_addr;
621 #ifdef CONFIG_TIPC_CRYPTO
622 tipc_crypto_xmit(net, &skb, b, dst, NULL);
623 if (skb)
624 #endif
625 b->media->send_msg(net, skb, b, dst);
626 }
627 rcu_read_unlock();
628 }
629
630 /**
631 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
632 * @skb: the received message
633 * @dev: the net device that the packet was received on
634 * @pt: the packet_type structure which was used to register this handler
635 * @orig_dev: the original receive net device in case the device is a bond
636 *
637 * Accept only packets explicitly sent to this node, or broadcast packets;
638 * ignores packets sent using interface multicast, and traffic sent to other
639 * nodes (which can happen if interface is running in promiscuous mode).
640 */
tipc_l2_rcv_msg(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)641 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
642 struct packet_type *pt, struct net_device *orig_dev)
643 {
644 struct tipc_bearer *b;
645
646 rcu_read_lock();
647 b = rcu_dereference(dev->tipc_ptr) ?:
648 rcu_dereference(orig_dev->tipc_ptr);
649 if (likely(b && test_bit(0, &b->up) &&
650 (skb->pkt_type <= PACKET_MULTICAST))) {
651 skb_mark_not_on_list(skb);
652 TIPC_SKB_CB(skb)->flags = 0;
653 tipc_rcv(dev_net(b->pt.dev), skb, b);
654 rcu_read_unlock();
655 return NET_RX_SUCCESS;
656 }
657 rcu_read_unlock();
658 kfree_skb(skb);
659 return NET_RX_DROP;
660 }
661
662 /**
663 * tipc_l2_device_event - handle device events from network device
664 * @nb: the context of the notification
665 * @evt: the type of event
666 * @ptr: the net device that the event was on
667 *
668 * This function is called by the Ethernet driver in case of link
669 * change event.
670 */
tipc_l2_device_event(struct notifier_block * nb,unsigned long evt,void * ptr)671 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
672 void *ptr)
673 {
674 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
675 struct net *net = dev_net(dev);
676 struct tipc_bearer *b;
677
678 b = rtnl_dereference(dev->tipc_ptr);
679 if (!b)
680 return NOTIFY_DONE;
681
682 trace_tipc_l2_device_event(dev, b, evt);
683 switch (evt) {
684 case NETDEV_CHANGE:
685 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
686 test_and_set_bit_lock(0, &b->up);
687 break;
688 }
689 fallthrough;
690 case NETDEV_GOING_DOWN:
691 clear_bit_unlock(0, &b->up);
692 tipc_reset_bearer(net, b);
693 break;
694 case NETDEV_UP:
695 test_and_set_bit_lock(0, &b->up);
696 break;
697 case NETDEV_CHANGEMTU:
698 if (tipc_mtu_bad(dev, 0)) {
699 bearer_disable(net, b);
700 break;
701 }
702 b->mtu = dev->mtu;
703 tipc_reset_bearer(net, b);
704 break;
705 case NETDEV_CHANGEADDR:
706 b->media->raw2addr(b, &b->addr,
707 (const char *)dev->dev_addr);
708 tipc_reset_bearer(net, b);
709 break;
710 case NETDEV_UNREGISTER:
711 case NETDEV_CHANGENAME:
712 bearer_disable(net, b);
713 break;
714 }
715 return NOTIFY_OK;
716 }
717
718 static struct notifier_block notifier = {
719 .notifier_call = tipc_l2_device_event,
720 .priority = 0,
721 };
722
tipc_bearer_setup(void)723 int tipc_bearer_setup(void)
724 {
725 return register_netdevice_notifier(¬ifier);
726 }
727
tipc_bearer_cleanup(void)728 void tipc_bearer_cleanup(void)
729 {
730 unregister_netdevice_notifier(¬ifier);
731 }
732
tipc_bearer_stop(struct net * net)733 void tipc_bearer_stop(struct net *net)
734 {
735 struct tipc_net *tn = net_generic(net, tipc_net_id);
736 struct tipc_bearer *b;
737 u32 i;
738
739 for (i = 0; i < MAX_BEARERS; i++) {
740 b = rtnl_dereference(tn->bearer_list[i]);
741 if (b) {
742 bearer_disable(net, b);
743 tn->bearer_list[i] = NULL;
744 }
745 }
746 }
747
tipc_clone_to_loopback(struct net * net,struct sk_buff_head * pkts)748 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
749 {
750 struct net_device *dev = net->loopback_dev;
751 struct sk_buff *skb, *_skb;
752 int exp;
753
754 skb_queue_walk(pkts, _skb) {
755 skb = pskb_copy(_skb, GFP_ATOMIC);
756 if (!skb)
757 continue;
758
759 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
760 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
761 kfree_skb(skb);
762 continue;
763 }
764
765 skb_reset_network_header(skb);
766 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
767 dev->dev_addr, skb->len);
768 skb->dev = dev;
769 skb->pkt_type = PACKET_HOST;
770 skb->ip_summed = CHECKSUM_UNNECESSARY;
771 skb->protocol = eth_type_trans(skb, dev);
772 netif_rx(skb);
773 }
774 }
775
tipc_loopback_rcv_pkt(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * od)776 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
777 struct packet_type *pt, struct net_device *od)
778 {
779 consume_skb(skb);
780 return NET_RX_SUCCESS;
781 }
782
tipc_attach_loopback(struct net * net)783 int tipc_attach_loopback(struct net *net)
784 {
785 struct net_device *dev = net->loopback_dev;
786 struct tipc_net *tn = tipc_net(net);
787
788 if (!dev)
789 return -ENODEV;
790
791 dev_hold_track(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
792 tn->loopback_pt.dev = dev;
793 tn->loopback_pt.type = htons(ETH_P_TIPC);
794 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
795 dev_add_pack(&tn->loopback_pt);
796 return 0;
797 }
798
tipc_detach_loopback(struct net * net)799 void tipc_detach_loopback(struct net *net)
800 {
801 struct tipc_net *tn = tipc_net(net);
802
803 dev_remove_pack(&tn->loopback_pt);
804 dev_put_track(net->loopback_dev, &tn->loopback_pt.dev_tracker);
805 }
806
807 /* Caller should hold rtnl_lock to protect the bearer */
__tipc_nl_add_bearer(struct tipc_nl_msg * msg,struct tipc_bearer * bearer,int nlflags)808 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
809 struct tipc_bearer *bearer, int nlflags)
810 {
811 void *hdr;
812 struct nlattr *attrs;
813 struct nlattr *prop;
814
815 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
816 nlflags, TIPC_NL_BEARER_GET);
817 if (!hdr)
818 return -EMSGSIZE;
819
820 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
821 if (!attrs)
822 goto msg_full;
823
824 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
825 goto attr_msg_full;
826
827 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
828 if (!prop)
829 goto prop_msg_full;
830 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
831 goto prop_msg_full;
832 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
833 goto prop_msg_full;
834 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
835 goto prop_msg_full;
836 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
837 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
838 goto prop_msg_full;
839
840 nla_nest_end(msg->skb, prop);
841
842 #ifdef CONFIG_TIPC_MEDIA_UDP
843 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
844 if (tipc_udp_nl_add_bearer_data(msg, bearer))
845 goto attr_msg_full;
846 }
847 #endif
848
849 nla_nest_end(msg->skb, attrs);
850 genlmsg_end(msg->skb, hdr);
851
852 return 0;
853
854 prop_msg_full:
855 nla_nest_cancel(msg->skb, prop);
856 attr_msg_full:
857 nla_nest_cancel(msg->skb, attrs);
858 msg_full:
859 genlmsg_cancel(msg->skb, hdr);
860
861 return -EMSGSIZE;
862 }
863
tipc_nl_bearer_dump(struct sk_buff * skb,struct netlink_callback * cb)864 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
865 {
866 int err;
867 int i = cb->args[0];
868 struct tipc_bearer *bearer;
869 struct tipc_nl_msg msg;
870 struct net *net = sock_net(skb->sk);
871 struct tipc_net *tn = net_generic(net, tipc_net_id);
872
873 if (i == MAX_BEARERS)
874 return 0;
875
876 msg.skb = skb;
877 msg.portid = NETLINK_CB(cb->skb).portid;
878 msg.seq = cb->nlh->nlmsg_seq;
879
880 rtnl_lock();
881 for (i = 0; i < MAX_BEARERS; i++) {
882 bearer = rtnl_dereference(tn->bearer_list[i]);
883 if (!bearer)
884 continue;
885
886 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
887 if (err)
888 break;
889 }
890 rtnl_unlock();
891
892 cb->args[0] = i;
893 return skb->len;
894 }
895
tipc_nl_bearer_get(struct sk_buff * skb,struct genl_info * info)896 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
897 {
898 int err;
899 char *name;
900 struct sk_buff *rep;
901 struct tipc_bearer *bearer;
902 struct tipc_nl_msg msg;
903 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
904 struct net *net = genl_info_net(info);
905
906 if (!info->attrs[TIPC_NLA_BEARER])
907 return -EINVAL;
908
909 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
910 info->attrs[TIPC_NLA_BEARER],
911 tipc_nl_bearer_policy, info->extack);
912 if (err)
913 return err;
914
915 if (!attrs[TIPC_NLA_BEARER_NAME])
916 return -EINVAL;
917 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
918
919 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
920 if (!rep)
921 return -ENOMEM;
922
923 msg.skb = rep;
924 msg.portid = info->snd_portid;
925 msg.seq = info->snd_seq;
926
927 rtnl_lock();
928 bearer = tipc_bearer_find(net, name);
929 if (!bearer) {
930 err = -EINVAL;
931 NL_SET_ERR_MSG(info->extack, "Bearer not found");
932 goto err_out;
933 }
934
935 err = __tipc_nl_add_bearer(&msg, bearer, 0);
936 if (err)
937 goto err_out;
938 rtnl_unlock();
939
940 return genlmsg_reply(rep, info);
941 err_out:
942 rtnl_unlock();
943 nlmsg_free(rep);
944
945 return err;
946 }
947
__tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)948 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
949 {
950 int err;
951 char *name;
952 struct tipc_bearer *bearer;
953 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
954 struct net *net = sock_net(skb->sk);
955
956 if (!info->attrs[TIPC_NLA_BEARER])
957 return -EINVAL;
958
959 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
960 info->attrs[TIPC_NLA_BEARER],
961 tipc_nl_bearer_policy, info->extack);
962 if (err)
963 return err;
964
965 if (!attrs[TIPC_NLA_BEARER_NAME])
966 return -EINVAL;
967
968 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
969
970 bearer = tipc_bearer_find(net, name);
971 if (!bearer) {
972 NL_SET_ERR_MSG(info->extack, "Bearer not found");
973 return -EINVAL;
974 }
975
976 bearer_disable(net, bearer);
977
978 return 0;
979 }
980
tipc_nl_bearer_disable(struct sk_buff * skb,struct genl_info * info)981 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
982 {
983 int err;
984
985 rtnl_lock();
986 err = __tipc_nl_bearer_disable(skb, info);
987 rtnl_unlock();
988
989 return err;
990 }
991
__tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)992 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
993 {
994 int err;
995 char *bearer;
996 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
997 struct net *net = sock_net(skb->sk);
998 u32 domain = 0;
999 u32 prio;
1000
1001 prio = TIPC_MEDIA_LINK_PRI;
1002
1003 if (!info->attrs[TIPC_NLA_BEARER])
1004 return -EINVAL;
1005
1006 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1007 info->attrs[TIPC_NLA_BEARER],
1008 tipc_nl_bearer_policy, info->extack);
1009 if (err)
1010 return err;
1011
1012 if (!attrs[TIPC_NLA_BEARER_NAME])
1013 return -EINVAL;
1014
1015 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1016
1017 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1018 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1019
1020 if (attrs[TIPC_NLA_BEARER_PROP]) {
1021 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1022
1023 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1024 props);
1025 if (err)
1026 return err;
1027
1028 if (props[TIPC_NLA_PROP_PRIO])
1029 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1030 }
1031
1032 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1033 info->extack);
1034 }
1035
tipc_nl_bearer_enable(struct sk_buff * skb,struct genl_info * info)1036 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1037 {
1038 int err;
1039
1040 rtnl_lock();
1041 err = __tipc_nl_bearer_enable(skb, info);
1042 rtnl_unlock();
1043
1044 return err;
1045 }
1046
tipc_nl_bearer_add(struct sk_buff * skb,struct genl_info * info)1047 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1048 {
1049 int err;
1050 char *name;
1051 struct tipc_bearer *b;
1052 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1053 struct net *net = sock_net(skb->sk);
1054
1055 if (!info->attrs[TIPC_NLA_BEARER])
1056 return -EINVAL;
1057
1058 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1059 info->attrs[TIPC_NLA_BEARER],
1060 tipc_nl_bearer_policy, info->extack);
1061 if (err)
1062 return err;
1063
1064 if (!attrs[TIPC_NLA_BEARER_NAME])
1065 return -EINVAL;
1066 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1067
1068 rtnl_lock();
1069 b = tipc_bearer_find(net, name);
1070 if (!b) {
1071 rtnl_unlock();
1072 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1073 return -EINVAL;
1074 }
1075
1076 #ifdef CONFIG_TIPC_MEDIA_UDP
1077 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1078 err = tipc_udp_nl_bearer_add(b,
1079 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1080 if (err) {
1081 rtnl_unlock();
1082 return err;
1083 }
1084 }
1085 #endif
1086 rtnl_unlock();
1087
1088 return 0;
1089 }
1090
__tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1091 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1092 {
1093 struct tipc_bearer *b;
1094 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1095 struct net *net = sock_net(skb->sk);
1096 char *name;
1097 int err;
1098
1099 if (!info->attrs[TIPC_NLA_BEARER])
1100 return -EINVAL;
1101
1102 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1103 info->attrs[TIPC_NLA_BEARER],
1104 tipc_nl_bearer_policy, info->extack);
1105 if (err)
1106 return err;
1107
1108 if (!attrs[TIPC_NLA_BEARER_NAME])
1109 return -EINVAL;
1110 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1111
1112 b = tipc_bearer_find(net, name);
1113 if (!b) {
1114 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1115 return -EINVAL;
1116 }
1117
1118 if (attrs[TIPC_NLA_BEARER_PROP]) {
1119 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1120
1121 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1122 props);
1123 if (err)
1124 return err;
1125
1126 if (props[TIPC_NLA_PROP_TOL]) {
1127 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1128 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1129 }
1130 if (props[TIPC_NLA_PROP_PRIO])
1131 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1132 if (props[TIPC_NLA_PROP_WIN])
1133 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1134 if (props[TIPC_NLA_PROP_MTU]) {
1135 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1136 NL_SET_ERR_MSG(info->extack,
1137 "MTU property is unsupported");
1138 return -EINVAL;
1139 }
1140 #ifdef CONFIG_TIPC_MEDIA_UDP
1141 if (tipc_udp_mtu_bad(nla_get_u32
1142 (props[TIPC_NLA_PROP_MTU]))) {
1143 NL_SET_ERR_MSG(info->extack,
1144 "MTU value is out-of-range");
1145 return -EINVAL;
1146 }
1147 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1148 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1149 #endif
1150 }
1151 }
1152
1153 return 0;
1154 }
1155
tipc_nl_bearer_set(struct sk_buff * skb,struct genl_info * info)1156 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1157 {
1158 int err;
1159
1160 rtnl_lock();
1161 err = __tipc_nl_bearer_set(skb, info);
1162 rtnl_unlock();
1163
1164 return err;
1165 }
1166
__tipc_nl_add_media(struct tipc_nl_msg * msg,struct tipc_media * media,int nlflags)1167 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1168 struct tipc_media *media, int nlflags)
1169 {
1170 void *hdr;
1171 struct nlattr *attrs;
1172 struct nlattr *prop;
1173
1174 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1175 nlflags, TIPC_NL_MEDIA_GET);
1176 if (!hdr)
1177 return -EMSGSIZE;
1178
1179 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1180 if (!attrs)
1181 goto msg_full;
1182
1183 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1184 goto attr_msg_full;
1185
1186 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1187 if (!prop)
1188 goto prop_msg_full;
1189 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1190 goto prop_msg_full;
1191 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1192 goto prop_msg_full;
1193 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1194 goto prop_msg_full;
1195 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1196 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1197 goto prop_msg_full;
1198
1199 nla_nest_end(msg->skb, prop);
1200 nla_nest_end(msg->skb, attrs);
1201 genlmsg_end(msg->skb, hdr);
1202
1203 return 0;
1204
1205 prop_msg_full:
1206 nla_nest_cancel(msg->skb, prop);
1207 attr_msg_full:
1208 nla_nest_cancel(msg->skb, attrs);
1209 msg_full:
1210 genlmsg_cancel(msg->skb, hdr);
1211
1212 return -EMSGSIZE;
1213 }
1214
tipc_nl_media_dump(struct sk_buff * skb,struct netlink_callback * cb)1215 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1216 {
1217 int err;
1218 int i = cb->args[0];
1219 struct tipc_nl_msg msg;
1220
1221 if (i == MAX_MEDIA)
1222 return 0;
1223
1224 msg.skb = skb;
1225 msg.portid = NETLINK_CB(cb->skb).portid;
1226 msg.seq = cb->nlh->nlmsg_seq;
1227
1228 rtnl_lock();
1229 for (; media_info_array[i] != NULL; i++) {
1230 err = __tipc_nl_add_media(&msg, media_info_array[i],
1231 NLM_F_MULTI);
1232 if (err)
1233 break;
1234 }
1235 rtnl_unlock();
1236
1237 cb->args[0] = i;
1238 return skb->len;
1239 }
1240
tipc_nl_media_get(struct sk_buff * skb,struct genl_info * info)1241 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1242 {
1243 int err;
1244 char *name;
1245 struct tipc_nl_msg msg;
1246 struct tipc_media *media;
1247 struct sk_buff *rep;
1248 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1249
1250 if (!info->attrs[TIPC_NLA_MEDIA])
1251 return -EINVAL;
1252
1253 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1254 info->attrs[TIPC_NLA_MEDIA],
1255 tipc_nl_media_policy, info->extack);
1256 if (err)
1257 return err;
1258
1259 if (!attrs[TIPC_NLA_MEDIA_NAME])
1260 return -EINVAL;
1261 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1262
1263 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1264 if (!rep)
1265 return -ENOMEM;
1266
1267 msg.skb = rep;
1268 msg.portid = info->snd_portid;
1269 msg.seq = info->snd_seq;
1270
1271 rtnl_lock();
1272 media = tipc_media_find(name);
1273 if (!media) {
1274 NL_SET_ERR_MSG(info->extack, "Media not found");
1275 err = -EINVAL;
1276 goto err_out;
1277 }
1278
1279 err = __tipc_nl_add_media(&msg, media, 0);
1280 if (err)
1281 goto err_out;
1282 rtnl_unlock();
1283
1284 return genlmsg_reply(rep, info);
1285 err_out:
1286 rtnl_unlock();
1287 nlmsg_free(rep);
1288
1289 return err;
1290 }
1291
__tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1292 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1293 {
1294 int err;
1295 char *name;
1296 struct tipc_media *m;
1297 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1298
1299 if (!info->attrs[TIPC_NLA_MEDIA])
1300 return -EINVAL;
1301
1302 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1303 info->attrs[TIPC_NLA_MEDIA],
1304 tipc_nl_media_policy, info->extack);
1305
1306 if (!attrs[TIPC_NLA_MEDIA_NAME])
1307 return -EINVAL;
1308 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1309
1310 m = tipc_media_find(name);
1311 if (!m) {
1312 NL_SET_ERR_MSG(info->extack, "Media not found");
1313 return -EINVAL;
1314 }
1315 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1316 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1317
1318 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1319 props);
1320 if (err)
1321 return err;
1322
1323 if (props[TIPC_NLA_PROP_TOL])
1324 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1325 if (props[TIPC_NLA_PROP_PRIO])
1326 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1327 if (props[TIPC_NLA_PROP_WIN])
1328 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1329 if (props[TIPC_NLA_PROP_MTU]) {
1330 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1331 NL_SET_ERR_MSG(info->extack,
1332 "MTU property is unsupported");
1333 return -EINVAL;
1334 }
1335 #ifdef CONFIG_TIPC_MEDIA_UDP
1336 if (tipc_udp_mtu_bad(nla_get_u32
1337 (props[TIPC_NLA_PROP_MTU]))) {
1338 NL_SET_ERR_MSG(info->extack,
1339 "MTU value is out-of-range");
1340 return -EINVAL;
1341 }
1342 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1343 #endif
1344 }
1345 }
1346
1347 return 0;
1348 }
1349
tipc_nl_media_set(struct sk_buff * skb,struct genl_info * info)1350 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1351 {
1352 int err;
1353
1354 rtnl_lock();
1355 err = __tipc_nl_media_set(skb, info);
1356 rtnl_unlock();
1357
1358 return err;
1359 }
1360