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