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Merge tag 'vfio-v5.13-rc1' of git://github.com/awilliam/linux-vfio
[mirror_ubuntu-jammy-kernel.git] / net / tipc / bearer.c
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 &eth_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
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 */
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 */
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 */
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 */
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 */
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 */
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
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
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 */
244 static int tipc_enable_bearer(struct net *net, const char *name,
245 u32 disc_domain, u32 prio,
246 struct nlattr *attr[])
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
258 if (!bearer_name_validate(name, &b_names)) {
259 errstr = "illegal name";
260 goto rejected;
261 }
262
263 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
264 errstr = "illegal priority";
265 goto rejected;
266 }
267
268 m = tipc_media_find(b_names.media_name);
269 if (!m) {
270 errstr = "media not registered";
271 goto rejected;
272 }
273
274 if (prio == TIPC_MEDIA_LINK_PRI)
275 prio = m->priority;
276
277 /* Check new bearer vs existing ones and find free bearer id if any */
278 while (bearer_id < MAX_BEARERS) {
279 b = rtnl_dereference(tn->bearer_list[bearer_id]);
280 if (!b)
281 break;
282 if (!strcmp(name, b->name)) {
283 errstr = "already enabled";
284 goto rejected;
285 }
286 bearer_id++;
287 if (b->priority != prio)
288 continue;
289 if (++with_this_prio <= 2)
290 continue;
291 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
292 name, prio);
293 if (prio == TIPC_MIN_LINK_PRI) {
294 errstr = "cannot adjust to lower";
295 goto rejected;
296 }
297 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
298 prio--;
299 bearer_id = 0;
300 with_this_prio = 1;
301 }
302
303 if (bearer_id >= MAX_BEARERS) {
304 errstr = "max 3 bearers permitted";
305 goto rejected;
306 }
307
308 b = kzalloc(sizeof(*b), GFP_ATOMIC);
309 if (!b)
310 return -ENOMEM;
311
312 strcpy(b->name, name);
313 b->media = m;
314 res = m->enable_media(net, b, attr);
315 if (res) {
316 kfree(b);
317 errstr = "failed to enable media";
318 goto rejected;
319 }
320
321 b->identity = bearer_id;
322 b->tolerance = m->tolerance;
323 b->min_win = m->min_win;
324 b->max_win = m->max_win;
325 b->domain = disc_domain;
326 b->net_plane = bearer_id + 'A';
327 b->priority = prio;
328 refcount_set(&b->refcnt, 1);
329
330 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
331 if (res) {
332 bearer_disable(net, b);
333 errstr = "failed to create discoverer";
334 goto rejected;
335 }
336
337 test_and_set_bit_lock(0, &b->up);
338 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
339 if (skb)
340 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
341
342 if (tipc_mon_create(net, bearer_id)) {
343 bearer_disable(net, b);
344 return -ENOMEM;
345 }
346
347 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
348
349 return res;
350 rejected:
351 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
352 return res;
353 }
354
355 /**
356 * tipc_reset_bearer - Reset all links established over this bearer
357 * @net: the applicable net namespace
358 * @b: the target bearer
359 */
360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
361 {
362 pr_info("Resetting bearer <%s>\n", b->name);
363 tipc_node_delete_links(net, b->identity);
364 tipc_disc_reset(net, b);
365 return 0;
366 }
367
368 bool tipc_bearer_hold(struct tipc_bearer *b)
369 {
370 return (b && refcount_inc_not_zero(&b->refcnt));
371 }
372
373 void tipc_bearer_put(struct tipc_bearer *b)
374 {
375 if (b && refcount_dec_and_test(&b->refcnt))
376 kfree_rcu(b, rcu);
377 }
378
379 /**
380 * bearer_disable - disable this bearer
381 * @net: the applicable net namespace
382 * @b: the bearer to disable
383 *
384 * Note: This routine assumes caller holds RTNL lock.
385 */
386 static void bearer_disable(struct net *net, struct tipc_bearer *b)
387 {
388 struct tipc_net *tn = tipc_net(net);
389 int bearer_id = b->identity;
390
391 pr_info("Disabling bearer <%s>\n", b->name);
392 clear_bit_unlock(0, &b->up);
393 tipc_node_delete_links(net, bearer_id);
394 b->media->disable_media(b);
395 RCU_INIT_POINTER(b->media_ptr, NULL);
396 if (b->disc)
397 tipc_disc_delete(b->disc);
398 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
399 tipc_bearer_put(b);
400 tipc_mon_delete(net, bearer_id);
401 }
402
403 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
404 struct nlattr *attr[])
405 {
406 char *dev_name = strchr((const char *)b->name, ':') + 1;
407 int hwaddr_len = b->media->hwaddr_len;
408 u8 node_id[NODE_ID_LEN] = {0,};
409 struct net_device *dev;
410
411 /* Find device with specified name */
412 dev = dev_get_by_name(net, dev_name);
413 if (!dev)
414 return -ENODEV;
415 if (tipc_mtu_bad(dev, 0)) {
416 dev_put(dev);
417 return -EINVAL;
418 }
419 if (dev == net->loopback_dev) {
420 dev_put(dev);
421 pr_info("Enabling <%s> not permitted\n", b->name);
422 return -EINVAL;
423 }
424
425 /* Autoconfigure own node identity if needed */
426 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
427 memcpy(node_id, dev->dev_addr, hwaddr_len);
428 tipc_net_init(net, node_id, 0);
429 }
430 if (!tipc_own_id(net)) {
431 dev_put(dev);
432 pr_warn("Failed to obtain node identity\n");
433 return -EINVAL;
434 }
435
436 /* Associate TIPC bearer with L2 bearer */
437 rcu_assign_pointer(b->media_ptr, dev);
438 b->pt.dev = dev;
439 b->pt.type = htons(ETH_P_TIPC);
440 b->pt.func = tipc_l2_rcv_msg;
441 dev_add_pack(&b->pt);
442 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
443 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
444 b->bcast_addr.media_id = b->media->type_id;
445 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
446 b->mtu = dev->mtu;
447 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
448 rcu_assign_pointer(dev->tipc_ptr, b);
449 return 0;
450 }
451
452 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
453 * @b: the target bearer
454 *
455 * Mark L2 bearer as inactive so that incoming buffers are thrown away
456 */
457 void tipc_disable_l2_media(struct tipc_bearer *b)
458 {
459 struct net_device *dev;
460
461 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
462 dev_remove_pack(&b->pt);
463 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
464 synchronize_net();
465 dev_put(dev);
466 }
467
468 /**
469 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
470 * @net: the associated network namespace
471 * @skb: the packet to be sent
472 * @b: the bearer through which the packet is to be sent
473 * @dest: peer destination address
474 */
475 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
476 struct tipc_bearer *b, struct tipc_media_addr *dest)
477 {
478 struct net_device *dev;
479 int delta;
480
481 dev = (struct net_device *)rcu_dereference(b->media_ptr);
482 if (!dev)
483 return 0;
484
485 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
486 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
487 kfree_skb(skb);
488 return 0;
489 }
490 skb_reset_network_header(skb);
491 skb->dev = dev;
492 skb->protocol = htons(ETH_P_TIPC);
493 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
494 dev->dev_addr, skb->len);
495 dev_queue_xmit(skb);
496 return 0;
497 }
498
499 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
500 {
501 bool supp = false;
502 struct tipc_bearer *b;
503
504 rcu_read_lock();
505 b = bearer_get(net, bearer_id);
506 if (b)
507 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
508 rcu_read_unlock();
509 return supp;
510 }
511
512 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
513 {
514 int mtu = 0;
515 struct tipc_bearer *b;
516
517 rcu_read_lock();
518 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
519 if (b)
520 mtu = b->mtu;
521 rcu_read_unlock();
522 return mtu;
523 }
524
525 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
526 */
527 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
528 struct sk_buff *skb,
529 struct tipc_media_addr *dest)
530 {
531 struct tipc_msg *hdr = buf_msg(skb);
532 struct tipc_bearer *b;
533
534 rcu_read_lock();
535 b = bearer_get(net, bearer_id);
536 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
537 #ifdef CONFIG_TIPC_CRYPTO
538 tipc_crypto_xmit(net, &skb, b, dest, NULL);
539 if (skb)
540 #endif
541 b->media->send_msg(net, skb, b, dest);
542 } else {
543 kfree_skb(skb);
544 }
545 rcu_read_unlock();
546 }
547
548 /* tipc_bearer_xmit() -send buffer to destination over bearer
549 */
550 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
551 struct sk_buff_head *xmitq,
552 struct tipc_media_addr *dst,
553 struct tipc_node *__dnode)
554 {
555 struct tipc_bearer *b;
556 struct sk_buff *skb, *tmp;
557
558 if (skb_queue_empty(xmitq))
559 return;
560
561 rcu_read_lock();
562 b = bearer_get(net, bearer_id);
563 if (unlikely(!b))
564 __skb_queue_purge(xmitq);
565 skb_queue_walk_safe(xmitq, skb, tmp) {
566 __skb_dequeue(xmitq);
567 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
568 #ifdef CONFIG_TIPC_CRYPTO
569 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
570 if (skb)
571 #endif
572 b->media->send_msg(net, skb, b, dst);
573 } else {
574 kfree_skb(skb);
575 }
576 }
577 rcu_read_unlock();
578 }
579
580 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
581 */
582 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
583 struct sk_buff_head *xmitq)
584 {
585 struct tipc_net *tn = tipc_net(net);
586 struct tipc_media_addr *dst;
587 int net_id = tn->net_id;
588 struct tipc_bearer *b;
589 struct sk_buff *skb, *tmp;
590 struct tipc_msg *hdr;
591
592 rcu_read_lock();
593 b = bearer_get(net, bearer_id);
594 if (unlikely(!b || !test_bit(0, &b->up)))
595 __skb_queue_purge(xmitq);
596 skb_queue_walk_safe(xmitq, skb, tmp) {
597 hdr = buf_msg(skb);
598 msg_set_non_seq(hdr, 1);
599 msg_set_mc_netid(hdr, net_id);
600 __skb_dequeue(xmitq);
601 dst = &b->bcast_addr;
602 #ifdef CONFIG_TIPC_CRYPTO
603 tipc_crypto_xmit(net, &skb, b, dst, NULL);
604 if (skb)
605 #endif
606 b->media->send_msg(net, skb, b, dst);
607 }
608 rcu_read_unlock();
609 }
610
611 /**
612 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
613 * @skb: the received message
614 * @dev: the net device that the packet was received on
615 * @pt: the packet_type structure which was used to register this handler
616 * @orig_dev: the original receive net device in case the device is a bond
617 *
618 * Accept only packets explicitly sent to this node, or broadcast packets;
619 * ignores packets sent using interface multicast, and traffic sent to other
620 * nodes (which can happen if interface is running in promiscuous mode).
621 */
622 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
623 struct packet_type *pt, struct net_device *orig_dev)
624 {
625 struct tipc_bearer *b;
626
627 rcu_read_lock();
628 b = rcu_dereference(dev->tipc_ptr) ?:
629 rcu_dereference(orig_dev->tipc_ptr);
630 if (likely(b && test_bit(0, &b->up) &&
631 (skb->pkt_type <= PACKET_MULTICAST))) {
632 skb_mark_not_on_list(skb);
633 TIPC_SKB_CB(skb)->flags = 0;
634 tipc_rcv(dev_net(b->pt.dev), skb, b);
635 rcu_read_unlock();
636 return NET_RX_SUCCESS;
637 }
638 rcu_read_unlock();
639 kfree_skb(skb);
640 return NET_RX_DROP;
641 }
642
643 /**
644 * tipc_l2_device_event - handle device events from network device
645 * @nb: the context of the notification
646 * @evt: the type of event
647 * @ptr: the net device that the event was on
648 *
649 * This function is called by the Ethernet driver in case of link
650 * change event.
651 */
652 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
653 void *ptr)
654 {
655 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
656 struct net *net = dev_net(dev);
657 struct tipc_bearer *b;
658
659 b = rtnl_dereference(dev->tipc_ptr);
660 if (!b)
661 return NOTIFY_DONE;
662
663 trace_tipc_l2_device_event(dev, b, evt);
664 switch (evt) {
665 case NETDEV_CHANGE:
666 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
667 test_and_set_bit_lock(0, &b->up);
668 break;
669 }
670 fallthrough;
671 case NETDEV_GOING_DOWN:
672 clear_bit_unlock(0, &b->up);
673 tipc_reset_bearer(net, b);
674 break;
675 case NETDEV_UP:
676 test_and_set_bit_lock(0, &b->up);
677 break;
678 case NETDEV_CHANGEMTU:
679 if (tipc_mtu_bad(dev, 0)) {
680 bearer_disable(net, b);
681 break;
682 }
683 b->mtu = dev->mtu;
684 tipc_reset_bearer(net, b);
685 break;
686 case NETDEV_CHANGEADDR:
687 b->media->raw2addr(b, &b->addr,
688 (char *)dev->dev_addr);
689 tipc_reset_bearer(net, b);
690 break;
691 case NETDEV_UNREGISTER:
692 case NETDEV_CHANGENAME:
693 bearer_disable(net, b);
694 break;
695 }
696 return NOTIFY_OK;
697 }
698
699 static struct notifier_block notifier = {
700 .notifier_call = tipc_l2_device_event,
701 .priority = 0,
702 };
703
704 int tipc_bearer_setup(void)
705 {
706 return register_netdevice_notifier(&notifier);
707 }
708
709 void tipc_bearer_cleanup(void)
710 {
711 unregister_netdevice_notifier(&notifier);
712 }
713
714 void tipc_bearer_stop(struct net *net)
715 {
716 struct tipc_net *tn = net_generic(net, tipc_net_id);
717 struct tipc_bearer *b;
718 u32 i;
719
720 for (i = 0; i < MAX_BEARERS; i++) {
721 b = rtnl_dereference(tn->bearer_list[i]);
722 if (b) {
723 bearer_disable(net, b);
724 tn->bearer_list[i] = NULL;
725 }
726 }
727 }
728
729 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
730 {
731 struct net_device *dev = net->loopback_dev;
732 struct sk_buff *skb, *_skb;
733 int exp;
734
735 skb_queue_walk(pkts, _skb) {
736 skb = pskb_copy(_skb, GFP_ATOMIC);
737 if (!skb)
738 continue;
739
740 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
741 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
742 kfree_skb(skb);
743 continue;
744 }
745
746 skb_reset_network_header(skb);
747 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
748 dev->dev_addr, skb->len);
749 skb->dev = dev;
750 skb->pkt_type = PACKET_HOST;
751 skb->ip_summed = CHECKSUM_UNNECESSARY;
752 skb->protocol = eth_type_trans(skb, dev);
753 netif_rx_ni(skb);
754 }
755 }
756
757 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
758 struct packet_type *pt, struct net_device *od)
759 {
760 consume_skb(skb);
761 return NET_RX_SUCCESS;
762 }
763
764 int tipc_attach_loopback(struct net *net)
765 {
766 struct net_device *dev = net->loopback_dev;
767 struct tipc_net *tn = tipc_net(net);
768
769 if (!dev)
770 return -ENODEV;
771
772 dev_hold(dev);
773 tn->loopback_pt.dev = dev;
774 tn->loopback_pt.type = htons(ETH_P_TIPC);
775 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
776 dev_add_pack(&tn->loopback_pt);
777 return 0;
778 }
779
780 void tipc_detach_loopback(struct net *net)
781 {
782 struct tipc_net *tn = tipc_net(net);
783
784 dev_remove_pack(&tn->loopback_pt);
785 dev_put(net->loopback_dev);
786 }
787
788 /* Caller should hold rtnl_lock to protect the bearer */
789 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
790 struct tipc_bearer *bearer, int nlflags)
791 {
792 void *hdr;
793 struct nlattr *attrs;
794 struct nlattr *prop;
795
796 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
797 nlflags, TIPC_NL_BEARER_GET);
798 if (!hdr)
799 return -EMSGSIZE;
800
801 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
802 if (!attrs)
803 goto msg_full;
804
805 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
806 goto attr_msg_full;
807
808 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
809 if (!prop)
810 goto prop_msg_full;
811 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
812 goto prop_msg_full;
813 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
814 goto prop_msg_full;
815 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
816 goto prop_msg_full;
817 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
818 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
819 goto prop_msg_full;
820
821 nla_nest_end(msg->skb, prop);
822
823 #ifdef CONFIG_TIPC_MEDIA_UDP
824 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
825 if (tipc_udp_nl_add_bearer_data(msg, bearer))
826 goto attr_msg_full;
827 }
828 #endif
829
830 nla_nest_end(msg->skb, attrs);
831 genlmsg_end(msg->skb, hdr);
832
833 return 0;
834
835 prop_msg_full:
836 nla_nest_cancel(msg->skb, prop);
837 attr_msg_full:
838 nla_nest_cancel(msg->skb, attrs);
839 msg_full:
840 genlmsg_cancel(msg->skb, hdr);
841
842 return -EMSGSIZE;
843 }
844
845 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
846 {
847 int err;
848 int i = cb->args[0];
849 struct tipc_bearer *bearer;
850 struct tipc_nl_msg msg;
851 struct net *net = sock_net(skb->sk);
852 struct tipc_net *tn = net_generic(net, tipc_net_id);
853
854 if (i == MAX_BEARERS)
855 return 0;
856
857 msg.skb = skb;
858 msg.portid = NETLINK_CB(cb->skb).portid;
859 msg.seq = cb->nlh->nlmsg_seq;
860
861 rtnl_lock();
862 for (i = 0; i < MAX_BEARERS; i++) {
863 bearer = rtnl_dereference(tn->bearer_list[i]);
864 if (!bearer)
865 continue;
866
867 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
868 if (err)
869 break;
870 }
871 rtnl_unlock();
872
873 cb->args[0] = i;
874 return skb->len;
875 }
876
877 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
878 {
879 int err;
880 char *name;
881 struct sk_buff *rep;
882 struct tipc_bearer *bearer;
883 struct tipc_nl_msg msg;
884 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
885 struct net *net = genl_info_net(info);
886
887 if (!info->attrs[TIPC_NLA_BEARER])
888 return -EINVAL;
889
890 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
891 info->attrs[TIPC_NLA_BEARER],
892 tipc_nl_bearer_policy, info->extack);
893 if (err)
894 return err;
895
896 if (!attrs[TIPC_NLA_BEARER_NAME])
897 return -EINVAL;
898 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
899
900 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
901 if (!rep)
902 return -ENOMEM;
903
904 msg.skb = rep;
905 msg.portid = info->snd_portid;
906 msg.seq = info->snd_seq;
907
908 rtnl_lock();
909 bearer = tipc_bearer_find(net, name);
910 if (!bearer) {
911 err = -EINVAL;
912 goto err_out;
913 }
914
915 err = __tipc_nl_add_bearer(&msg, bearer, 0);
916 if (err)
917 goto err_out;
918 rtnl_unlock();
919
920 return genlmsg_reply(rep, info);
921 err_out:
922 rtnl_unlock();
923 nlmsg_free(rep);
924
925 return err;
926 }
927
928 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
929 {
930 int err;
931 char *name;
932 struct tipc_bearer *bearer;
933 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
934 struct net *net = sock_net(skb->sk);
935
936 if (!info->attrs[TIPC_NLA_BEARER])
937 return -EINVAL;
938
939 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
940 info->attrs[TIPC_NLA_BEARER],
941 tipc_nl_bearer_policy, info->extack);
942 if (err)
943 return err;
944
945 if (!attrs[TIPC_NLA_BEARER_NAME])
946 return -EINVAL;
947
948 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
949
950 bearer = tipc_bearer_find(net, name);
951 if (!bearer)
952 return -EINVAL;
953
954 bearer_disable(net, bearer);
955
956 return 0;
957 }
958
959 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
960 {
961 int err;
962
963 rtnl_lock();
964 err = __tipc_nl_bearer_disable(skb, info);
965 rtnl_unlock();
966
967 return err;
968 }
969
970 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
971 {
972 int err;
973 char *bearer;
974 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
975 struct net *net = sock_net(skb->sk);
976 u32 domain = 0;
977 u32 prio;
978
979 prio = TIPC_MEDIA_LINK_PRI;
980
981 if (!info->attrs[TIPC_NLA_BEARER])
982 return -EINVAL;
983
984 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
985 info->attrs[TIPC_NLA_BEARER],
986 tipc_nl_bearer_policy, info->extack);
987 if (err)
988 return err;
989
990 if (!attrs[TIPC_NLA_BEARER_NAME])
991 return -EINVAL;
992
993 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
994
995 if (attrs[TIPC_NLA_BEARER_DOMAIN])
996 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
997
998 if (attrs[TIPC_NLA_BEARER_PROP]) {
999 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1000
1001 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1002 props);
1003 if (err)
1004 return err;
1005
1006 if (props[TIPC_NLA_PROP_PRIO])
1007 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1008 }
1009
1010 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
1011 }
1012
1013 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1014 {
1015 int err;
1016
1017 rtnl_lock();
1018 err = __tipc_nl_bearer_enable(skb, info);
1019 rtnl_unlock();
1020
1021 return err;
1022 }
1023
1024 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1025 {
1026 int err;
1027 char *name;
1028 struct tipc_bearer *b;
1029 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1030 struct net *net = sock_net(skb->sk);
1031
1032 if (!info->attrs[TIPC_NLA_BEARER])
1033 return -EINVAL;
1034
1035 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1036 info->attrs[TIPC_NLA_BEARER],
1037 tipc_nl_bearer_policy, info->extack);
1038 if (err)
1039 return err;
1040
1041 if (!attrs[TIPC_NLA_BEARER_NAME])
1042 return -EINVAL;
1043 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1044
1045 rtnl_lock();
1046 b = tipc_bearer_find(net, name);
1047 if (!b) {
1048 rtnl_unlock();
1049 return -EINVAL;
1050 }
1051
1052 #ifdef CONFIG_TIPC_MEDIA_UDP
1053 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1054 err = tipc_udp_nl_bearer_add(b,
1055 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1056 if (err) {
1057 rtnl_unlock();
1058 return err;
1059 }
1060 }
1061 #endif
1062 rtnl_unlock();
1063
1064 return 0;
1065 }
1066
1067 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1068 {
1069 struct tipc_bearer *b;
1070 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1071 struct net *net = sock_net(skb->sk);
1072 char *name;
1073 int err;
1074
1075 if (!info->attrs[TIPC_NLA_BEARER])
1076 return -EINVAL;
1077
1078 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1079 info->attrs[TIPC_NLA_BEARER],
1080 tipc_nl_bearer_policy, info->extack);
1081 if (err)
1082 return err;
1083
1084 if (!attrs[TIPC_NLA_BEARER_NAME])
1085 return -EINVAL;
1086 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1087
1088 b = tipc_bearer_find(net, name);
1089 if (!b)
1090 return -EINVAL;
1091
1092 if (attrs[TIPC_NLA_BEARER_PROP]) {
1093 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1094
1095 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1096 props);
1097 if (err)
1098 return err;
1099
1100 if (props[TIPC_NLA_PROP_TOL]) {
1101 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1102 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1103 }
1104 if (props[TIPC_NLA_PROP_PRIO])
1105 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1106 if (props[TIPC_NLA_PROP_WIN])
1107 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1108 if (props[TIPC_NLA_PROP_MTU]) {
1109 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1110 return -EINVAL;
1111 #ifdef CONFIG_TIPC_MEDIA_UDP
1112 if (tipc_udp_mtu_bad(nla_get_u32
1113 (props[TIPC_NLA_PROP_MTU])))
1114 return -EINVAL;
1115 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1116 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1117 #endif
1118 }
1119 }
1120
1121 return 0;
1122 }
1123
1124 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1125 {
1126 int err;
1127
1128 rtnl_lock();
1129 err = __tipc_nl_bearer_set(skb, info);
1130 rtnl_unlock();
1131
1132 return err;
1133 }
1134
1135 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1136 struct tipc_media *media, int nlflags)
1137 {
1138 void *hdr;
1139 struct nlattr *attrs;
1140 struct nlattr *prop;
1141
1142 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1143 nlflags, TIPC_NL_MEDIA_GET);
1144 if (!hdr)
1145 return -EMSGSIZE;
1146
1147 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1148 if (!attrs)
1149 goto msg_full;
1150
1151 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1152 goto attr_msg_full;
1153
1154 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1155 if (!prop)
1156 goto prop_msg_full;
1157 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1158 goto prop_msg_full;
1159 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1160 goto prop_msg_full;
1161 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1162 goto prop_msg_full;
1163 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1164 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1165 goto prop_msg_full;
1166
1167 nla_nest_end(msg->skb, prop);
1168 nla_nest_end(msg->skb, attrs);
1169 genlmsg_end(msg->skb, hdr);
1170
1171 return 0;
1172
1173 prop_msg_full:
1174 nla_nest_cancel(msg->skb, prop);
1175 attr_msg_full:
1176 nla_nest_cancel(msg->skb, attrs);
1177 msg_full:
1178 genlmsg_cancel(msg->skb, hdr);
1179
1180 return -EMSGSIZE;
1181 }
1182
1183 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1184 {
1185 int err;
1186 int i = cb->args[0];
1187 struct tipc_nl_msg msg;
1188
1189 if (i == MAX_MEDIA)
1190 return 0;
1191
1192 msg.skb = skb;
1193 msg.portid = NETLINK_CB(cb->skb).portid;
1194 msg.seq = cb->nlh->nlmsg_seq;
1195
1196 rtnl_lock();
1197 for (; media_info_array[i] != NULL; i++) {
1198 err = __tipc_nl_add_media(&msg, media_info_array[i],
1199 NLM_F_MULTI);
1200 if (err)
1201 break;
1202 }
1203 rtnl_unlock();
1204
1205 cb->args[0] = i;
1206 return skb->len;
1207 }
1208
1209 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1210 {
1211 int err;
1212 char *name;
1213 struct tipc_nl_msg msg;
1214 struct tipc_media *media;
1215 struct sk_buff *rep;
1216 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1217
1218 if (!info->attrs[TIPC_NLA_MEDIA])
1219 return -EINVAL;
1220
1221 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1222 info->attrs[TIPC_NLA_MEDIA],
1223 tipc_nl_media_policy, info->extack);
1224 if (err)
1225 return err;
1226
1227 if (!attrs[TIPC_NLA_MEDIA_NAME])
1228 return -EINVAL;
1229 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1230
1231 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1232 if (!rep)
1233 return -ENOMEM;
1234
1235 msg.skb = rep;
1236 msg.portid = info->snd_portid;
1237 msg.seq = info->snd_seq;
1238
1239 rtnl_lock();
1240 media = tipc_media_find(name);
1241 if (!media) {
1242 err = -EINVAL;
1243 goto err_out;
1244 }
1245
1246 err = __tipc_nl_add_media(&msg, media, 0);
1247 if (err)
1248 goto err_out;
1249 rtnl_unlock();
1250
1251 return genlmsg_reply(rep, info);
1252 err_out:
1253 rtnl_unlock();
1254 nlmsg_free(rep);
1255
1256 return err;
1257 }
1258
1259 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1260 {
1261 int err;
1262 char *name;
1263 struct tipc_media *m;
1264 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1265
1266 if (!info->attrs[TIPC_NLA_MEDIA])
1267 return -EINVAL;
1268
1269 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1270 info->attrs[TIPC_NLA_MEDIA],
1271 tipc_nl_media_policy, info->extack);
1272
1273 if (!attrs[TIPC_NLA_MEDIA_NAME])
1274 return -EINVAL;
1275 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1276
1277 m = tipc_media_find(name);
1278 if (!m)
1279 return -EINVAL;
1280
1281 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1282 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1283
1284 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1285 props);
1286 if (err)
1287 return err;
1288
1289 if (props[TIPC_NLA_PROP_TOL])
1290 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1291 if (props[TIPC_NLA_PROP_PRIO])
1292 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1293 if (props[TIPC_NLA_PROP_WIN])
1294 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1295 if (props[TIPC_NLA_PROP_MTU]) {
1296 if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1297 return -EINVAL;
1298 #ifdef CONFIG_TIPC_MEDIA_UDP
1299 if (tipc_udp_mtu_bad(nla_get_u32
1300 (props[TIPC_NLA_PROP_MTU])))
1301 return -EINVAL;
1302 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1303 #endif
1304 }
1305 }
1306
1307 return 0;
1308 }
1309
1310 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1311 {
1312 int err;
1313
1314 rtnl_lock();
1315 err = __tipc_nl_media_set(skb, info);
1316 rtnl_unlock();
1317
1318 return err;
1319 }
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