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