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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
51static 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
62static 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
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static 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 */
77struct 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 */
92static 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 */
109int 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 */
137static 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 */
177struct 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 */
196int 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
212void 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
224void 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 */
245static 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 errstr = "illegal name";
263 NL_SET_ERR_MSG(extack, "Illegal name");
264 goto rejected;
265 }
266
267 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
268 errstr = "illegal priority";
269 NL_SET_ERR_MSG(extack, "Illegal priority");
270 goto rejected;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 errstr = "media not registered";
276 NL_SET_ERR_MSG(extack, "Media not registered");
277 goto rejected;
278 }
279
280 if (prio == TIPC_MEDIA_LINK_PRI)
281 prio = m->priority;
282
283 /* Check new bearer vs existing ones and find free bearer id if any */
284 bearer_id = MAX_BEARERS;
285 i = MAX_BEARERS;
286 while (i-- != 0) {
287 b = rtnl_dereference(tn->bearer_list[i]);
288 if (!b) {
289 bearer_id = i;
290 continue;
291 }
292 if (!strcmp(name, b->name)) {
293 errstr = "already enabled";
294 NL_SET_ERR_MSG(extack, "Already enabled");
295 goto rejected;
296 }
297
298 if (b->priority == prio &&
299 (++with_this_prio > 2)) {
300 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
301 name, prio);
302
303 if (prio == TIPC_MIN_LINK_PRI) {
304 errstr = "cannot adjust to lower";
305 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
306 goto rejected;
307 }
308
309 pr_warn("Bearer <%s>: trying with adjusted priority\n",
310 name);
311 prio--;
312 bearer_id = MAX_BEARERS;
313 i = MAX_BEARERS;
314 with_this_prio = 1;
315 }
316 }
317
318 if (bearer_id >= MAX_BEARERS) {
319 errstr = "max 3 bearers permitted";
320 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
321 goto rejected;
322 }
323
324 b = kzalloc(sizeof(*b), GFP_ATOMIC);
325 if (!b)
326 return -ENOMEM;
327
328 strcpy(b->name, name);
329 b->media = m;
330 res = m->enable_media(net, b, attr);
331 if (res) {
332 kfree(b);
333 errstr = "failed to enable media";
334 NL_SET_ERR_MSG(extack, "Failed to enable media");
335 goto rejected;
336 }
337
338 b->identity = bearer_id;
339 b->tolerance = m->tolerance;
340 b->min_win = m->min_win;
341 b->max_win = m->max_win;
342 b->domain = disc_domain;
343 b->net_plane = bearer_id + 'A';
344 b->priority = prio;
345 refcount_set(&b->refcnt, 1);
346
347 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
348 if (res) {
349 bearer_disable(net, b);
350 errstr = "failed to create discoverer";
351 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
352 goto rejected;
353 }
354
355 test_and_set_bit_lock(0, &b->up);
356 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
357 if (skb)
358 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
359
360 if (tipc_mon_create(net, bearer_id)) {
361 bearer_disable(net, b);
362 return -ENOMEM;
363 }
364
365 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
366
367 return res;
368rejected:
369 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
370 return res;
371}
372
373/**
374 * tipc_reset_bearer - Reset all links established over this bearer
375 * @net: the applicable net namespace
376 * @b: the target bearer
377 */
378static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
379{
380 pr_info("Resetting bearer <%s>\n", b->name);
381 tipc_node_delete_links(net, b->identity);
382 tipc_disc_reset(net, b);
383 return 0;
384}
385
386bool tipc_bearer_hold(struct tipc_bearer *b)
387{
388 return (b && refcount_inc_not_zero(&b->refcnt));
389}
390
391void tipc_bearer_put(struct tipc_bearer *b)
392{
393 if (b && refcount_dec_and_test(&b->refcnt))
394 kfree_rcu(b, rcu);
395}
396
397/**
398 * bearer_disable - disable this bearer
399 * @net: the applicable net namespace
400 * @b: the bearer to disable
401 *
402 * Note: This routine assumes caller holds RTNL lock.
403 */
404static void bearer_disable(struct net *net, struct tipc_bearer *b)
405{
406 struct tipc_net *tn = tipc_net(net);
407 int bearer_id = b->identity;
408
409 pr_info("Disabling bearer <%s>\n", b->name);
410 clear_bit_unlock(0, &b->up);
411 tipc_node_delete_links(net, bearer_id);
412 b->media->disable_media(b);
413 RCU_INIT_POINTER(b->media_ptr, NULL);
414 if (b->disc)
415 tipc_disc_delete(b->disc);
416 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
417 tipc_bearer_put(b);
418 tipc_mon_delete(net, bearer_id);
419}
420
421int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
422 struct nlattr *attr[])
423{
424 char *dev_name = strchr((const char *)b->name, ':') + 1;
425 int hwaddr_len = b->media->hwaddr_len;
426 u8 node_id[NODE_ID_LEN] = {0,};
427 struct net_device *dev;
428
429 /* Find device with specified name */
430 dev = dev_get_by_name(net, dev_name);
431 if (!dev)
432 return -ENODEV;
433 if (tipc_mtu_bad(dev, 0)) {
434 dev_put(dev);
435 return -EINVAL;
436 }
437 if (dev == net->loopback_dev) {
438 dev_put(dev);
439 pr_info("Enabling <%s> not permitted\n", b->name);
440 return -EINVAL;
441 }
442
443 /* Autoconfigure own node identity if needed */
444 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
445 memcpy(node_id, dev->dev_addr, hwaddr_len);
446 tipc_net_init(net, node_id, 0);
447 }
448 if (!tipc_own_id(net)) {
449 dev_put(dev);
450 pr_warn("Failed to obtain node identity\n");
451 return -EINVAL;
452 }
453
454 /* Associate TIPC bearer with L2 bearer */
455 rcu_assign_pointer(b->media_ptr, dev);
456 b->pt.dev = dev;
457 b->pt.type = htons(ETH_P_TIPC);
458 b->pt.func = tipc_l2_rcv_msg;
459 dev_add_pack(&b->pt);
460 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
461 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
462 b->bcast_addr.media_id = b->media->type_id;
463 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
464 b->mtu = dev->mtu;
465 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
466 rcu_assign_pointer(dev->tipc_ptr, b);
467 return 0;
468}
469
470/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
471 * @b: the target bearer
472 *
473 * Mark L2 bearer as inactive so that incoming buffers are thrown away
474 */
475void tipc_disable_l2_media(struct tipc_bearer *b)
476{
477 struct net_device *dev;
478
479 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
480 dev_remove_pack(&b->pt);
481 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
482 synchronize_net();
483 dev_put(dev);
484}
485
486/**
487 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
488 * @net: the associated network namespace
489 * @skb: the packet to be sent
490 * @b: the bearer through which the packet is to be sent
491 * @dest: peer destination address
492 */
493int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
494 struct tipc_bearer *b, struct tipc_media_addr *dest)
495{
496 struct net_device *dev;
497 int delta;
498
499 dev = (struct net_device *)rcu_dereference(b->media_ptr);
500 if (!dev)
501 return 0;
502
503 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
504 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
505 kfree_skb(skb);
506 return 0;
507 }
508 skb_reset_network_header(skb);
509 skb->dev = dev;
510 skb->protocol = htons(ETH_P_TIPC);
511 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
512 dev->dev_addr, skb->len);
513 dev_queue_xmit(skb);
514 return 0;
515}
516
517bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
518{
519 bool supp = false;
520 struct tipc_bearer *b;
521
522 rcu_read_lock();
523 b = bearer_get(net, bearer_id);
524 if (b)
525 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
526 rcu_read_unlock();
527 return supp;
528}
529
530int tipc_bearer_mtu(struct net *net, u32 bearer_id)
531{
532 int mtu = 0;
533 struct tipc_bearer *b;
534
535 rcu_read_lock();
536 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
537 if (b)
538 mtu = b->mtu;
539 rcu_read_unlock();
540 return mtu;
541}
542
543/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
544 */
545void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
546 struct sk_buff *skb,
547 struct tipc_media_addr *dest)
548{
549 struct tipc_msg *hdr = buf_msg(skb);
550 struct tipc_bearer *b;
551
552 rcu_read_lock();
553 b = bearer_get(net, bearer_id);
554 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
555#ifdef CONFIG_TIPC_CRYPTO
556 tipc_crypto_xmit(net, &skb, b, dest, NULL);
557 if (skb)
558#endif
559 b->media->send_msg(net, skb, b, dest);
560 } else {
561 kfree_skb(skb);
562 }
563 rcu_read_unlock();
564}
565
566/* tipc_bearer_xmit() -send buffer to destination over bearer
567 */
568void tipc_bearer_xmit(struct net *net, u32 bearer_id,
569 struct sk_buff_head *xmitq,
570 struct tipc_media_addr *dst,
571 struct tipc_node *__dnode)
572{
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575
576 if (skb_queue_empty(xmitq))
577 return;
578
579 rcu_read_lock();
580 b = bearer_get(net, bearer_id);
581 if (unlikely(!b))
582 __skb_queue_purge(xmitq);
583 skb_queue_walk_safe(xmitq, skb, tmp) {
584 __skb_dequeue(xmitq);
585 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
586#ifdef CONFIG_TIPC_CRYPTO
587 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
588 if (skb)
589#endif
590 b->media->send_msg(net, skb, b, dst);
591 } else {
592 kfree_skb(skb);
593 }
594 }
595 rcu_read_unlock();
596}
597
598/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
599 */
600void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
601 struct sk_buff_head *xmitq)
602{
603 struct tipc_net *tn = tipc_net(net);
604 struct tipc_media_addr *dst;
605 int net_id = tn->net_id;
606 struct tipc_bearer *b;
607 struct sk_buff *skb, *tmp;
608 struct tipc_msg *hdr;
609
610 rcu_read_lock();
611 b = bearer_get(net, bearer_id);
612 if (unlikely(!b || !test_bit(0, &b->up)))
613 __skb_queue_purge(xmitq);
614 skb_queue_walk_safe(xmitq, skb, tmp) {
615 hdr = buf_msg(skb);
616 msg_set_non_seq(hdr, 1);
617 msg_set_mc_netid(hdr, net_id);
618 __skb_dequeue(xmitq);
619 dst = &b->bcast_addr;
620#ifdef CONFIG_TIPC_CRYPTO
621 tipc_crypto_xmit(net, &skb, b, dst, NULL);
622 if (skb)
623#endif
624 b->media->send_msg(net, skb, b, dst);
625 }
626 rcu_read_unlock();
627}
628
629/**
630 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
631 * @skb: the received message
632 * @dev: the net device that the packet was received on
633 * @pt: the packet_type structure which was used to register this handler
634 * @orig_dev: the original receive net device in case the device is a bond
635 *
636 * Accept only packets explicitly sent to this node, or broadcast packets;
637 * ignores packets sent using interface multicast, and traffic sent to other
638 * nodes (which can happen if interface is running in promiscuous mode).
639 */
640static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
641 struct packet_type *pt, struct net_device *orig_dev)
642{
643 struct tipc_bearer *b;
644
645 rcu_read_lock();
646 b = rcu_dereference(dev->tipc_ptr) ?:
647 rcu_dereference(orig_dev->tipc_ptr);
648 if (likely(b && test_bit(0, &b->up) &&
649 (skb->pkt_type <= PACKET_MULTICAST))) {
650 skb_mark_not_on_list(skb);
651 TIPC_SKB_CB(skb)->flags = 0;
652 tipc_rcv(dev_net(b->pt.dev), skb, b);
653 rcu_read_unlock();
654 return NET_RX_SUCCESS;
655 }
656 rcu_read_unlock();
657 kfree_skb(skb);
658 return NET_RX_DROP;
659}
660
661/**
662 * tipc_l2_device_event - handle device events from network device
663 * @nb: the context of the notification
664 * @evt: the type of event
665 * @ptr: the net device that the event was on
666 *
667 * This function is called by the Ethernet driver in case of link
668 * change event.
669 */
670static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
671 void *ptr)
672{
673 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
674 struct net *net = dev_net(dev);
675 struct tipc_bearer *b;
676
677 b = rtnl_dereference(dev->tipc_ptr);
678 if (!b)
679 return NOTIFY_DONE;
680
681 trace_tipc_l2_device_event(dev, b, evt);
682 switch (evt) {
683 case NETDEV_CHANGE:
684 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
685 test_and_set_bit_lock(0, &b->up);
686 break;
687 }
688 fallthrough;
689 case NETDEV_GOING_DOWN:
690 clear_bit_unlock(0, &b->up);
691 tipc_reset_bearer(net, b);
692 break;
693 case NETDEV_UP:
694 test_and_set_bit_lock(0, &b->up);
695 break;
696 case NETDEV_CHANGEMTU:
697 if (tipc_mtu_bad(dev, 0)) {
698 bearer_disable(net, b);
699 break;
700 }
701 b->mtu = dev->mtu;
702 tipc_reset_bearer(net, b);
703 break;
704 case NETDEV_CHANGEADDR:
705 b->media->raw2addr(b, &b->addr,
706 (char *)dev->dev_addr);
707 tipc_reset_bearer(net, b);
708 break;
709 case NETDEV_UNREGISTER:
710 case NETDEV_CHANGENAME:
711 bearer_disable(net, b);
712 break;
713 }
714 return NOTIFY_OK;
715}
716
717static struct notifier_block notifier = {
718 .notifier_call = tipc_l2_device_event,
719 .priority = 0,
720};
721
722int tipc_bearer_setup(void)
723{
724 return register_netdevice_notifier(¬ifier);
725}
726
727void tipc_bearer_cleanup(void)
728{
729 unregister_netdevice_notifier(¬ifier);
730}
731
732void tipc_bearer_stop(struct net *net)
733{
734 struct tipc_net *tn = net_generic(net, tipc_net_id);
735 struct tipc_bearer *b;
736 u32 i;
737
738 for (i = 0; i < MAX_BEARERS; i++) {
739 b = rtnl_dereference(tn->bearer_list[i]);
740 if (b) {
741 bearer_disable(net, b);
742 tn->bearer_list[i] = NULL;
743 }
744 }
745}
746
747void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
748{
749 struct net_device *dev = net->loopback_dev;
750 struct sk_buff *skb, *_skb;
751 int exp;
752
753 skb_queue_walk(pkts, _skb) {
754 skb = pskb_copy(_skb, GFP_ATOMIC);
755 if (!skb)
756 continue;
757
758 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
759 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
760 kfree_skb(skb);
761 continue;
762 }
763
764 skb_reset_network_header(skb);
765 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
766 dev->dev_addr, skb->len);
767 skb->dev = dev;
768 skb->pkt_type = PACKET_HOST;
769 skb->ip_summed = CHECKSUM_UNNECESSARY;
770 skb->protocol = eth_type_trans(skb, dev);
771 netif_rx_ni(skb);
772 }
773}
774
775static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
776 struct packet_type *pt, struct net_device *od)
777{
778 consume_skb(skb);
779 return NET_RX_SUCCESS;
780}
781
782int tipc_attach_loopback(struct net *net)
783{
784 struct net_device *dev = net->loopback_dev;
785 struct tipc_net *tn = tipc_net(net);
786
787 if (!dev)
788 return -ENODEV;
789
790 dev_hold(dev);
791 tn->loopback_pt.dev = dev;
792 tn->loopback_pt.type = htons(ETH_P_TIPC);
793 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
794 dev_add_pack(&tn->loopback_pt);
795 return 0;
796}
797
798void tipc_detach_loopback(struct net *net)
799{
800 struct tipc_net *tn = tipc_net(net);
801
802 dev_remove_pack(&tn->loopback_pt);
803 dev_put(net->loopback_dev);
804}
805
806/* Caller should hold rtnl_lock to protect the bearer */
807static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
808 struct tipc_bearer *bearer, int nlflags)
809{
810 void *hdr;
811 struct nlattr *attrs;
812 struct nlattr *prop;
813
814 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
815 nlflags, TIPC_NL_BEARER_GET);
816 if (!hdr)
817 return -EMSGSIZE;
818
819 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
820 if (!attrs)
821 goto msg_full;
822
823 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
824 goto attr_msg_full;
825
826 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
827 if (!prop)
828 goto prop_msg_full;
829 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
830 goto prop_msg_full;
831 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
832 goto prop_msg_full;
833 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
834 goto prop_msg_full;
835 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
836 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
837 goto prop_msg_full;
838
839 nla_nest_end(msg->skb, prop);
840
841#ifdef CONFIG_TIPC_MEDIA_UDP
842 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
843 if (tipc_udp_nl_add_bearer_data(msg, bearer))
844 goto attr_msg_full;
845 }
846#endif
847
848 nla_nest_end(msg->skb, attrs);
849 genlmsg_end(msg->skb, hdr);
850
851 return 0;
852
853prop_msg_full:
854 nla_nest_cancel(msg->skb, prop);
855attr_msg_full:
856 nla_nest_cancel(msg->skb, attrs);
857msg_full:
858 genlmsg_cancel(msg->skb, hdr);
859
860 return -EMSGSIZE;
861}
862
863int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
864{
865 int err;
866 int i = cb->args[0];
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct net *net = sock_net(skb->sk);
870 struct tipc_net *tn = net_generic(net, tipc_net_id);
871
872 if (i == MAX_BEARERS)
873 return 0;
874
875 msg.skb = skb;
876 msg.portid = NETLINK_CB(cb->skb).portid;
877 msg.seq = cb->nlh->nlmsg_seq;
878
879 rtnl_lock();
880 for (i = 0; i < MAX_BEARERS; i++) {
881 bearer = rtnl_dereference(tn->bearer_list[i]);
882 if (!bearer)
883 continue;
884
885 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
886 if (err)
887 break;
888 }
889 rtnl_unlock();
890
891 cb->args[0] = i;
892 return skb->len;
893}
894
895int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
896{
897 int err;
898 char *name;
899 struct sk_buff *rep;
900 struct tipc_bearer *bearer;
901 struct tipc_nl_msg msg;
902 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
903 struct net *net = genl_info_net(info);
904
905 if (!info->attrs[TIPC_NLA_BEARER])
906 return -EINVAL;
907
908 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
909 info->attrs[TIPC_NLA_BEARER],
910 tipc_nl_bearer_policy, info->extack);
911 if (err)
912 return err;
913
914 if (!attrs[TIPC_NLA_BEARER_NAME])
915 return -EINVAL;
916 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
917
918 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
919 if (!rep)
920 return -ENOMEM;
921
922 msg.skb = rep;
923 msg.portid = info->snd_portid;
924 msg.seq = info->snd_seq;
925
926 rtnl_lock();
927 bearer = tipc_bearer_find(net, name);
928 if (!bearer) {
929 err = -EINVAL;
930 NL_SET_ERR_MSG(info->extack, "Bearer not found");
931 goto err_out;
932 }
933
934 err = __tipc_nl_add_bearer(&msg, bearer, 0);
935 if (err)
936 goto err_out;
937 rtnl_unlock();
938
939 return genlmsg_reply(rep, info);
940err_out:
941 rtnl_unlock();
942 nlmsg_free(rep);
943
944 return err;
945}
946
947int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
948{
949 int err;
950 char *name;
951 struct tipc_bearer *bearer;
952 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
953 struct net *net = sock_net(skb->sk);
954
955 if (!info->attrs[TIPC_NLA_BEARER])
956 return -EINVAL;
957
958 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
959 info->attrs[TIPC_NLA_BEARER],
960 tipc_nl_bearer_policy, info->extack);
961 if (err)
962 return err;
963
964 if (!attrs[TIPC_NLA_BEARER_NAME])
965 return -EINVAL;
966
967 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
968
969 bearer = tipc_bearer_find(net, name);
970 if (!bearer) {
971 NL_SET_ERR_MSG(info->extack, "Bearer not found");
972 return -EINVAL;
973 }
974
975 bearer_disable(net, bearer);
976
977 return 0;
978}
979
980int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
981{
982 int err;
983
984 rtnl_lock();
985 err = __tipc_nl_bearer_disable(skb, info);
986 rtnl_unlock();
987
988 return err;
989}
990
991int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
992{
993 int err;
994 char *bearer;
995 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
996 struct net *net = sock_net(skb->sk);
997 u32 domain = 0;
998 u32 prio;
999
1000 prio = TIPC_MEDIA_LINK_PRI;
1001
1002 if (!info->attrs[TIPC_NLA_BEARER])
1003 return -EINVAL;
1004
1005 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1006 info->attrs[TIPC_NLA_BEARER],
1007 tipc_nl_bearer_policy, info->extack);
1008 if (err)
1009 return err;
1010
1011 if (!attrs[TIPC_NLA_BEARER_NAME])
1012 return -EINVAL;
1013
1014 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1015
1016 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1017 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1018
1019 if (attrs[TIPC_NLA_BEARER_PROP]) {
1020 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1021
1022 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1023 props);
1024 if (err)
1025 return err;
1026
1027 if (props[TIPC_NLA_PROP_PRIO])
1028 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1029 }
1030
1031 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1032 info->extack);
1033}
1034
1035int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1036{
1037 int err;
1038
1039 rtnl_lock();
1040 err = __tipc_nl_bearer_enable(skb, info);
1041 rtnl_unlock();
1042
1043 return err;
1044}
1045
1046int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1047{
1048 int err;
1049 char *name;
1050 struct tipc_bearer *b;
1051 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1052 struct net *net = sock_net(skb->sk);
1053
1054 if (!info->attrs[TIPC_NLA_BEARER])
1055 return -EINVAL;
1056
1057 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1058 info->attrs[TIPC_NLA_BEARER],
1059 tipc_nl_bearer_policy, info->extack);
1060 if (err)
1061 return err;
1062
1063 if (!attrs[TIPC_NLA_BEARER_NAME])
1064 return -EINVAL;
1065 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1066
1067 rtnl_lock();
1068 b = tipc_bearer_find(net, name);
1069 if (!b) {
1070 rtnl_unlock();
1071 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1072 return -EINVAL;
1073 }
1074
1075#ifdef CONFIG_TIPC_MEDIA_UDP
1076 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1077 err = tipc_udp_nl_bearer_add(b,
1078 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1079 if (err) {
1080 rtnl_unlock();
1081 return err;
1082 }
1083 }
1084#endif
1085 rtnl_unlock();
1086
1087 return 0;
1088}
1089
1090int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1091{
1092 struct tipc_bearer *b;
1093 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1094 struct net *net = sock_net(skb->sk);
1095 char *name;
1096 int err;
1097
1098 if (!info->attrs[TIPC_NLA_BEARER])
1099 return -EINVAL;
1100
1101 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1102 info->attrs[TIPC_NLA_BEARER],
1103 tipc_nl_bearer_policy, info->extack);
1104 if (err)
1105 return err;
1106
1107 if (!attrs[TIPC_NLA_BEARER_NAME])
1108 return -EINVAL;
1109 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1110
1111 b = tipc_bearer_find(net, name);
1112 if (!b) {
1113 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1114 return -EINVAL;
1115 }
1116
1117 if (attrs[TIPC_NLA_BEARER_PROP]) {
1118 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1119
1120 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1121 props);
1122 if (err)
1123 return err;
1124
1125 if (props[TIPC_NLA_PROP_TOL]) {
1126 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1127 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1128 }
1129 if (props[TIPC_NLA_PROP_PRIO])
1130 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1131 if (props[TIPC_NLA_PROP_WIN])
1132 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1133 if (props[TIPC_NLA_PROP_MTU]) {
1134 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1135 NL_SET_ERR_MSG(info->extack,
1136 "MTU property is unsupported");
1137 return -EINVAL;
1138 }
1139#ifdef CONFIG_TIPC_MEDIA_UDP
1140 if (tipc_udp_mtu_bad(nla_get_u32
1141 (props[TIPC_NLA_PROP_MTU]))) {
1142 NL_SET_ERR_MSG(info->extack,
1143 "MTU value is out-of-range");
1144 return -EINVAL;
1145 }
1146 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1147 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1148#endif
1149 }
1150 }
1151
1152 return 0;
1153}
1154
1155int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1156{
1157 int err;
1158
1159 rtnl_lock();
1160 err = __tipc_nl_bearer_set(skb, info);
1161 rtnl_unlock();
1162
1163 return err;
1164}
1165
1166static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1167 struct tipc_media *media, int nlflags)
1168{
1169 void *hdr;
1170 struct nlattr *attrs;
1171 struct nlattr *prop;
1172
1173 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1174 nlflags, TIPC_NL_MEDIA_GET);
1175 if (!hdr)
1176 return -EMSGSIZE;
1177
1178 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1179 if (!attrs)
1180 goto msg_full;
1181
1182 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1183 goto attr_msg_full;
1184
1185 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1186 if (!prop)
1187 goto prop_msg_full;
1188 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1189 goto prop_msg_full;
1190 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1191 goto prop_msg_full;
1192 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1193 goto prop_msg_full;
1194 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1195 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1196 goto prop_msg_full;
1197
1198 nla_nest_end(msg->skb, prop);
1199 nla_nest_end(msg->skb, attrs);
1200 genlmsg_end(msg->skb, hdr);
1201
1202 return 0;
1203
1204prop_msg_full:
1205 nla_nest_cancel(msg->skb, prop);
1206attr_msg_full:
1207 nla_nest_cancel(msg->skb, attrs);
1208msg_full:
1209 genlmsg_cancel(msg->skb, hdr);
1210
1211 return -EMSGSIZE;
1212}
1213
1214int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1215{
1216 int err;
1217 int i = cb->args[0];
1218 struct tipc_nl_msg msg;
1219
1220 if (i == MAX_MEDIA)
1221 return 0;
1222
1223 msg.skb = skb;
1224 msg.portid = NETLINK_CB(cb->skb).portid;
1225 msg.seq = cb->nlh->nlmsg_seq;
1226
1227 rtnl_lock();
1228 for (; media_info_array[i] != NULL; i++) {
1229 err = __tipc_nl_add_media(&msg, media_info_array[i],
1230 NLM_F_MULTI);
1231 if (err)
1232 break;
1233 }
1234 rtnl_unlock();
1235
1236 cb->args[0] = i;
1237 return skb->len;
1238}
1239
1240int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1241{
1242 int err;
1243 char *name;
1244 struct tipc_nl_msg msg;
1245 struct tipc_media *media;
1246 struct sk_buff *rep;
1247 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1248
1249 if (!info->attrs[TIPC_NLA_MEDIA])
1250 return -EINVAL;
1251
1252 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1253 info->attrs[TIPC_NLA_MEDIA],
1254 tipc_nl_media_policy, info->extack);
1255 if (err)
1256 return err;
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1263 if (!rep)
1264 return -ENOMEM;
1265
1266 msg.skb = rep;
1267 msg.portid = info->snd_portid;
1268 msg.seq = info->snd_seq;
1269
1270 rtnl_lock();
1271 media = tipc_media_find(name);
1272 if (!media) {
1273 NL_SET_ERR_MSG(info->extack, "Media not found");
1274 err = -EINVAL;
1275 goto err_out;
1276 }
1277
1278 err = __tipc_nl_add_media(&msg, media, 0);
1279 if (err)
1280 goto err_out;
1281 rtnl_unlock();
1282
1283 return genlmsg_reply(rep, info);
1284err_out:
1285 rtnl_unlock();
1286 nlmsg_free(rep);
1287
1288 return err;
1289}
1290
1291int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1292{
1293 int err;
1294 char *name;
1295 struct tipc_media *m;
1296 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1297
1298 if (!info->attrs[TIPC_NLA_MEDIA])
1299 return -EINVAL;
1300
1301 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1302 info->attrs[TIPC_NLA_MEDIA],
1303 tipc_nl_media_policy, info->extack);
1304
1305 if (!attrs[TIPC_NLA_MEDIA_NAME])
1306 return -EINVAL;
1307 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1308
1309 m = tipc_media_find(name);
1310 if (!m) {
1311 NL_SET_ERR_MSG(info->extack, "Media not found");
1312 return -EINVAL;
1313 }
1314 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1315 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1316
1317 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1318 props);
1319 if (err)
1320 return err;
1321
1322 if (props[TIPC_NLA_PROP_TOL])
1323 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1324 if (props[TIPC_NLA_PROP_PRIO])
1325 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1326 if (props[TIPC_NLA_PROP_WIN])
1327 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1328 if (props[TIPC_NLA_PROP_MTU]) {
1329 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1330 NL_SET_ERR_MSG(info->extack,
1331 "MTU property is unsupported");
1332 return -EINVAL;
1333 }
1334#ifdef CONFIG_TIPC_MEDIA_UDP
1335 if (tipc_udp_mtu_bad(nla_get_u32
1336 (props[TIPC_NLA_PROP_MTU]))) {
1337 NL_SET_ERR_MSG(info->extack,
1338 "MTU value is out-of-range");
1339 return -EINVAL;
1340 }
1341 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1342#endif
1343 }
1344 }
1345
1346 return 0;
1347}
1348
1349int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1350{
1351 int err;
1352
1353 rtnl_lock();
1354 err = __tipc_nl_media_set(skb, info);
1355 rtnl_unlock();
1356
1357 return err;
1358}
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
51static 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
62static 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
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static 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 */
77struct 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 */
92static 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 */
109int 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 */
137static 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 */
177struct 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 */
196int 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
212void 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
223void 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 */
243static 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;
367rejected:
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 */
377static 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
385bool tipc_bearer_hold(struct tipc_bearer *b)
386{
387 return (b && refcount_inc_not_zero(&b->refcnt));
388}
389
390void 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 */
403static 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
420int 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 */
474void 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 */
492int 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
516bool 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
529int 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
542int 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 */
557void 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 */
580void 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 */
612void 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 */
652static 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 */
682static 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
729static struct notifier_block notifier = {
730 .notifier_call = tipc_l2_device_event,
731 .priority = 0,
732};
733
734int tipc_bearer_setup(void)
735{
736 return register_netdevice_notifier(¬ifier);
737}
738
739void tipc_bearer_cleanup(void)
740{
741 unregister_netdevice_notifier(¬ifier);
742}
743
744void 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
759void 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
787static 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
794int 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
810void 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 */
819static 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
865prop_msg_full:
866 nla_nest_cancel(msg->skb, prop);
867attr_msg_full:
868 nla_nest_cancel(msg->skb, attrs);
869msg_full:
870 genlmsg_cancel(msg->skb, hdr);
871
872 return -EMSGSIZE;
873}
874
875int 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
907int 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);
952err_out:
953 rtnl_unlock();
954 nlmsg_free(rep);
955
956 return err;
957}
958
959int __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
992int 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
1003int __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
1047int 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
1058int 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 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1083 err = -EINVAL;
1084 goto out;
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 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1091 err = -EINVAL;
1092 goto out;
1093 }
1094
1095 err = tipc_udp_nl_bearer_add(b,
1096 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1097 }
1098#endif
1099out:
1100 rtnl_unlock();
1101
1102 return err;
1103}
1104
1105int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1106{
1107 struct tipc_bearer *b;
1108 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1109 struct net *net = sock_net(skb->sk);
1110 char *name;
1111 int err;
1112
1113 if (!info->attrs[TIPC_NLA_BEARER])
1114 return -EINVAL;
1115
1116 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1117 info->attrs[TIPC_NLA_BEARER],
1118 tipc_nl_bearer_policy, info->extack);
1119 if (err)
1120 return err;
1121
1122 if (!attrs[TIPC_NLA_BEARER_NAME])
1123 return -EINVAL;
1124 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1125
1126 b = tipc_bearer_find(net, name);
1127 if (!b) {
1128 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1129 return -EINVAL;
1130 }
1131
1132 if (attrs[TIPC_NLA_BEARER_PROP]) {
1133 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1134
1135 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1136 props);
1137 if (err)
1138 return err;
1139
1140 if (props[TIPC_NLA_PROP_TOL]) {
1141 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1142 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1143 }
1144 if (props[TIPC_NLA_PROP_PRIO])
1145 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1146 if (props[TIPC_NLA_PROP_WIN])
1147 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1148 if (props[TIPC_NLA_PROP_MTU]) {
1149 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1150 NL_SET_ERR_MSG(info->extack,
1151 "MTU property is unsupported");
1152 return -EINVAL;
1153 }
1154#ifdef CONFIG_TIPC_MEDIA_UDP
1155 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1156 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1157 NL_SET_ERR_MSG(info->extack,
1158 "MTU value is out-of-range");
1159 return -EINVAL;
1160 }
1161 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1162 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1163#endif
1164 }
1165 }
1166
1167 return 0;
1168}
1169
1170int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1171{
1172 int err;
1173
1174 rtnl_lock();
1175 err = __tipc_nl_bearer_set(skb, info);
1176 rtnl_unlock();
1177
1178 return err;
1179}
1180
1181static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1182 struct tipc_media *media, int nlflags)
1183{
1184 void *hdr;
1185 struct nlattr *attrs;
1186 struct nlattr *prop;
1187
1188 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1189 nlflags, TIPC_NL_MEDIA_GET);
1190 if (!hdr)
1191 return -EMSGSIZE;
1192
1193 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1194 if (!attrs)
1195 goto msg_full;
1196
1197 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1198 goto attr_msg_full;
1199
1200 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1201 if (!prop)
1202 goto prop_msg_full;
1203 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1204 goto prop_msg_full;
1205 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1206 goto prop_msg_full;
1207 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1208 goto prop_msg_full;
1209 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1210 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1211 goto prop_msg_full;
1212
1213 nla_nest_end(msg->skb, prop);
1214 nla_nest_end(msg->skb, attrs);
1215 genlmsg_end(msg->skb, hdr);
1216
1217 return 0;
1218
1219prop_msg_full:
1220 nla_nest_cancel(msg->skb, prop);
1221attr_msg_full:
1222 nla_nest_cancel(msg->skb, attrs);
1223msg_full:
1224 genlmsg_cancel(msg->skb, hdr);
1225
1226 return -EMSGSIZE;
1227}
1228
1229int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1230{
1231 int err;
1232 int i = cb->args[0];
1233 struct tipc_nl_msg msg;
1234
1235 if (i == MAX_MEDIA)
1236 return 0;
1237
1238 msg.skb = skb;
1239 msg.portid = NETLINK_CB(cb->skb).portid;
1240 msg.seq = cb->nlh->nlmsg_seq;
1241
1242 rtnl_lock();
1243 for (; media_info_array[i] != NULL; i++) {
1244 err = __tipc_nl_add_media(&msg, media_info_array[i],
1245 NLM_F_MULTI);
1246 if (err)
1247 break;
1248 }
1249 rtnl_unlock();
1250
1251 cb->args[0] = i;
1252 return skb->len;
1253}
1254
1255int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1256{
1257 int err;
1258 char *name;
1259 struct tipc_nl_msg msg;
1260 struct tipc_media *media;
1261 struct sk_buff *rep;
1262 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1263
1264 if (!info->attrs[TIPC_NLA_MEDIA])
1265 return -EINVAL;
1266
1267 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1268 info->attrs[TIPC_NLA_MEDIA],
1269 tipc_nl_media_policy, info->extack);
1270 if (err)
1271 return err;
1272
1273 if (!attrs[TIPC_NLA_MEDIA_NAME])
1274 return -EINVAL;
1275 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1276
1277 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1278 if (!rep)
1279 return -ENOMEM;
1280
1281 msg.skb = rep;
1282 msg.portid = info->snd_portid;
1283 msg.seq = info->snd_seq;
1284
1285 rtnl_lock();
1286 media = tipc_media_find(name);
1287 if (!media) {
1288 NL_SET_ERR_MSG(info->extack, "Media not found");
1289 err = -EINVAL;
1290 goto err_out;
1291 }
1292
1293 err = __tipc_nl_add_media(&msg, media, 0);
1294 if (err)
1295 goto err_out;
1296 rtnl_unlock();
1297
1298 return genlmsg_reply(rep, info);
1299err_out:
1300 rtnl_unlock();
1301 nlmsg_free(rep);
1302
1303 return err;
1304}
1305
1306int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1307{
1308 int err;
1309 char *name;
1310 struct tipc_media *m;
1311 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1312
1313 if (!info->attrs[TIPC_NLA_MEDIA])
1314 return -EINVAL;
1315
1316 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1317 info->attrs[TIPC_NLA_MEDIA],
1318 tipc_nl_media_policy, info->extack);
1319
1320 if (!attrs[TIPC_NLA_MEDIA_NAME])
1321 return -EINVAL;
1322 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1323
1324 m = tipc_media_find(name);
1325 if (!m) {
1326 NL_SET_ERR_MSG(info->extack, "Media not found");
1327 return -EINVAL;
1328 }
1329 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1330 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1331
1332 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1333 props);
1334 if (err)
1335 return err;
1336
1337 if (props[TIPC_NLA_PROP_TOL])
1338 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1339 if (props[TIPC_NLA_PROP_PRIO])
1340 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1341 if (props[TIPC_NLA_PROP_WIN])
1342 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1343 if (props[TIPC_NLA_PROP_MTU]) {
1344 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1345 NL_SET_ERR_MSG(info->extack,
1346 "MTU property is unsupported");
1347 return -EINVAL;
1348 }
1349#ifdef CONFIG_TIPC_MEDIA_UDP
1350 if (tipc_udp_mtu_bad(nla_get_u32
1351 (props[TIPC_NLA_PROP_MTU]))) {
1352 NL_SET_ERR_MSG(info->extack,
1353 "MTU value is out-of-range");
1354 return -EINVAL;
1355 }
1356 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1357#endif
1358 }
1359 }
1360
1361 return 0;
1362}
1363
1364int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1365{
1366 int err;
1367
1368 rtnl_lock();
1369 err = __tipc_nl_media_set(skb, info);
1370 rtnl_unlock();
1371
1372 return err;
1373}