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