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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 */
76struct tipc_media *tipc_media_find(const char *name)
77{
78 u32 i;
79
80 for (i = 0; media_info_array[i] != NULL; i++) {
81 if (!strcmp(media_info_array[i]->name, name))
82 break;
83 }
84 return media_info_array[i];
85}
86
87/**
88 * media_find_id - locates specified media object by type identifier
89 */
90static struct tipc_media *media_find_id(u8 type)
91{
92 u32 i;
93
94 for (i = 0; media_info_array[i] != NULL; i++) {
95 if (media_info_array[i]->type_id == type)
96 break;
97 }
98 return media_info_array[i];
99}
100
101/**
102 * tipc_media_addr_printf - record media address in print buffer
103 */
104int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
105{
106 char addr_str[MAX_ADDR_STR];
107 struct tipc_media *m;
108 int ret;
109
110 m = media_find_id(a->media_id);
111
112 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
113 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
114 else {
115 u32 i;
116
117 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
118 for (i = 0; i < sizeof(a->value); i++)
119 ret += scnprintf(buf + ret, len - ret,
120 "-%x", a->value[i]);
121 }
122 return ret;
123}
124
125/**
126 * bearer_name_validate - validate & (optionally) deconstruct bearer name
127 * @name: ptr to bearer name string
128 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
129 *
130 * Returns 1 if bearer name is valid, otherwise 0.
131 */
132static int bearer_name_validate(const char *name,
133 struct tipc_bearer_names *name_parts)
134{
135 char name_copy[TIPC_MAX_BEARER_NAME];
136 char *media_name;
137 char *if_name;
138 u32 media_len;
139 u32 if_len;
140
141 /* copy bearer name & ensure length is OK */
142 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
143 /* need above in case non-Posix strncpy() doesn't pad with nulls */
144 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
145 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
146 return 0;
147
148 /* ensure all component parts of bearer name are present */
149 media_name = name_copy;
150 if_name = strchr(media_name, ':');
151 if (if_name == NULL)
152 return 0;
153 *(if_name++) = 0;
154 media_len = if_name - media_name;
155 if_len = strlen(if_name) + 1;
156
157 /* validate component parts of bearer name */
158 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
159 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
160 return 0;
161
162 /* return bearer name components, if necessary */
163 if (name_parts) {
164 strcpy(name_parts->media_name, media_name);
165 strcpy(name_parts->if_name, if_name);
166 }
167 return 1;
168}
169
170/**
171 * tipc_bearer_find - locates bearer object with matching bearer name
172 */
173struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b;
177 u32 i;
178
179 for (i = 0; i < MAX_BEARERS; i++) {
180 b = rtnl_dereference(tn->bearer_list[i]);
181 if (b && (!strcmp(b->name, name)))
182 return b;
183 }
184 return NULL;
185}
186
187/* tipc_bearer_get_name - get the bearer name from its id.
188 * @net: network namespace
189 * @name: a pointer to the buffer where the name will be stored.
190 * @bearer_id: the id to get the name from.
191 */
192int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
193{
194 struct tipc_net *tn = tipc_net(net);
195 struct tipc_bearer *b;
196
197 if (bearer_id >= MAX_BEARERS)
198 return -EINVAL;
199
200 b = rtnl_dereference(tn->bearer_list[bearer_id]);
201 if (!b)
202 return -EINVAL;
203
204 strcpy(name, b->name);
205 return 0;
206}
207
208void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
209{
210 struct tipc_net *tn = net_generic(net, tipc_net_id);
211 struct tipc_bearer *b;
212
213 rcu_read_lock();
214 b = rcu_dereference(tn->bearer_list[bearer_id]);
215 if (b)
216 tipc_disc_add_dest(b->disc);
217 rcu_read_unlock();
218}
219
220void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
221{
222 struct tipc_net *tn = net_generic(net, tipc_net_id);
223 struct tipc_bearer *b;
224
225 rcu_read_lock();
226 b = rcu_dereference(tn->bearer_list[bearer_id]);
227 if (b)
228 tipc_disc_remove_dest(b->disc);
229 rcu_read_unlock();
230}
231
232/**
233 * tipc_enable_bearer - enable bearer with the given name
234 */
235static int tipc_enable_bearer(struct net *net, const char *name,
236 u32 disc_domain, u32 prio,
237 struct nlattr *attr[])
238{
239 struct tipc_net *tn = tipc_net(net);
240 struct tipc_bearer_names b_names;
241 int with_this_prio = 1;
242 struct tipc_bearer *b;
243 struct tipc_media *m;
244 struct sk_buff *skb;
245 int bearer_id = 0;
246 int res = -EINVAL;
247 char *errstr = "";
248
249 if (!bearer_name_validate(name, &b_names)) {
250 errstr = "illegal name";
251 goto rejected;
252 }
253
254 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
255 errstr = "illegal priority";
256 goto rejected;
257 }
258
259 m = tipc_media_find(b_names.media_name);
260 if (!m) {
261 errstr = "media not registered";
262 goto rejected;
263 }
264
265 if (prio == TIPC_MEDIA_LINK_PRI)
266 prio = m->priority;
267
268 /* Check new bearer vs existing ones and find free bearer id if any */
269 while (bearer_id < MAX_BEARERS) {
270 b = rtnl_dereference(tn->bearer_list[bearer_id]);
271 if (!b)
272 break;
273 if (!strcmp(name, b->name)) {
274 errstr = "already enabled";
275 goto rejected;
276 }
277 bearer_id++;
278 if (b->priority != prio)
279 continue;
280 if (++with_this_prio <= 2)
281 continue;
282 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
283 name, prio);
284 if (prio == TIPC_MIN_LINK_PRI) {
285 errstr = "cannot adjust to lower";
286 goto rejected;
287 }
288 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
289 prio--;
290 bearer_id = 0;
291 with_this_prio = 1;
292 }
293
294 if (bearer_id >= MAX_BEARERS) {
295 errstr = "max 3 bearers permitted";
296 goto rejected;
297 }
298
299 b = kzalloc(sizeof(*b), GFP_ATOMIC);
300 if (!b)
301 return -ENOMEM;
302
303 strcpy(b->name, name);
304 b->media = m;
305 res = m->enable_media(net, b, attr);
306 if (res) {
307 kfree(b);
308 errstr = "failed to enable media";
309 goto rejected;
310 }
311
312 b->identity = bearer_id;
313 b->tolerance = m->tolerance;
314 b->min_win = m->min_win;
315 b->max_win = m->max_win;
316 b->domain = disc_domain;
317 b->net_plane = bearer_id + 'A';
318 b->priority = prio;
319 refcount_set(&b->refcnt, 1);
320
321 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
322 if (res) {
323 bearer_disable(net, b);
324 errstr = "failed to create discoverer";
325 goto rejected;
326 }
327
328 test_and_set_bit_lock(0, &b->up);
329 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
330 if (skb)
331 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
332
333 if (tipc_mon_create(net, bearer_id)) {
334 bearer_disable(net, b);
335 return -ENOMEM;
336 }
337
338 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
339
340 return res;
341rejected:
342 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
343 return res;
344}
345
346/**
347 * tipc_reset_bearer - Reset all links established over this bearer
348 */
349static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
350{
351 pr_info("Resetting bearer <%s>\n", b->name);
352 tipc_node_delete_links(net, b->identity);
353 tipc_disc_reset(net, b);
354 return 0;
355}
356
357bool tipc_bearer_hold(struct tipc_bearer *b)
358{
359 return (b && refcount_inc_not_zero(&b->refcnt));
360}
361
362void tipc_bearer_put(struct tipc_bearer *b)
363{
364 if (b && refcount_dec_and_test(&b->refcnt))
365 kfree_rcu(b, rcu);
366}
367
368/**
369 * bearer_disable
370 *
371 * Note: This routine assumes caller holds RTNL lock.
372 */
373static void bearer_disable(struct net *net, struct tipc_bearer *b)
374{
375 struct tipc_net *tn = tipc_net(net);
376 int bearer_id = b->identity;
377
378 pr_info("Disabling bearer <%s>\n", b->name);
379 clear_bit_unlock(0, &b->up);
380 tipc_node_delete_links(net, bearer_id);
381 b->media->disable_media(b);
382 RCU_INIT_POINTER(b->media_ptr, NULL);
383 if (b->disc)
384 tipc_disc_delete(b->disc);
385 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
386 tipc_bearer_put(b);
387 tipc_mon_delete(net, bearer_id);
388}
389
390int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
391 struct nlattr *attr[])
392{
393 char *dev_name = strchr((const char *)b->name, ':') + 1;
394 int hwaddr_len = b->media->hwaddr_len;
395 u8 node_id[NODE_ID_LEN] = {0,};
396 struct net_device *dev;
397
398 /* Find device with specified name */
399 dev = dev_get_by_name(net, dev_name);
400 if (!dev)
401 return -ENODEV;
402 if (tipc_mtu_bad(dev, 0)) {
403 dev_put(dev);
404 return -EINVAL;
405 }
406 if (dev == net->loopback_dev) {
407 dev_put(dev);
408 pr_info("Enabling <%s> not permitted\n", b->name);
409 return -EINVAL;
410 }
411
412 /* Autoconfigure own node identity if needed */
413 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
414 memcpy(node_id, dev->dev_addr, hwaddr_len);
415 tipc_net_init(net, node_id, 0);
416 }
417 if (!tipc_own_id(net)) {
418 dev_put(dev);
419 pr_warn("Failed to obtain node identity\n");
420 return -EINVAL;
421 }
422
423 /* Associate TIPC bearer with L2 bearer */
424 rcu_assign_pointer(b->media_ptr, dev);
425 b->pt.dev = dev;
426 b->pt.type = htons(ETH_P_TIPC);
427 b->pt.func = tipc_l2_rcv_msg;
428 dev_add_pack(&b->pt);
429 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
430 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
431 b->bcast_addr.media_id = b->media->type_id;
432 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
433 b->mtu = dev->mtu;
434 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
435 rcu_assign_pointer(dev->tipc_ptr, b);
436 return 0;
437}
438
439/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
440 *
441 * Mark L2 bearer as inactive so that incoming buffers are thrown away
442 */
443void tipc_disable_l2_media(struct tipc_bearer *b)
444{
445 struct net_device *dev;
446
447 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
448 dev_remove_pack(&b->pt);
449 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
450 synchronize_net();
451 dev_put(dev);
452}
453
454/**
455 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
456 * @skb: the packet to be sent
457 * @b: the bearer through which the packet is to be sent
458 * @dest: peer destination address
459 */
460int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
461 struct tipc_bearer *b, struct tipc_media_addr *dest)
462{
463 struct net_device *dev;
464 int delta;
465
466 dev = (struct net_device *)rcu_dereference(b->media_ptr);
467 if (!dev)
468 return 0;
469
470 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
471 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
472 kfree_skb(skb);
473 return 0;
474 }
475 skb_reset_network_header(skb);
476 skb->dev = dev;
477 skb->protocol = htons(ETH_P_TIPC);
478 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
479 dev->dev_addr, skb->len);
480 dev_queue_xmit(skb);
481 return 0;
482}
483
484bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
485{
486 bool supp = false;
487 struct tipc_bearer *b;
488
489 rcu_read_lock();
490 b = bearer_get(net, bearer_id);
491 if (b)
492 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
493 rcu_read_unlock();
494 return supp;
495}
496
497int tipc_bearer_mtu(struct net *net, u32 bearer_id)
498{
499 int mtu = 0;
500 struct tipc_bearer *b;
501
502 rcu_read_lock();
503 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
504 if (b)
505 mtu = b->mtu;
506 rcu_read_unlock();
507 return mtu;
508}
509
510/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
511 */
512void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
513 struct sk_buff *skb,
514 struct tipc_media_addr *dest)
515{
516 struct tipc_msg *hdr = buf_msg(skb);
517 struct tipc_bearer *b;
518
519 rcu_read_lock();
520 b = bearer_get(net, bearer_id);
521 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
522#ifdef CONFIG_TIPC_CRYPTO
523 tipc_crypto_xmit(net, &skb, b, dest, NULL);
524 if (skb)
525#endif
526 b->media->send_msg(net, skb, b, dest);
527 } else {
528 kfree_skb(skb);
529 }
530 rcu_read_unlock();
531}
532
533/* tipc_bearer_xmit() -send buffer to destination over bearer
534 */
535void tipc_bearer_xmit(struct net *net, u32 bearer_id,
536 struct sk_buff_head *xmitq,
537 struct tipc_media_addr *dst,
538 struct tipc_node *__dnode)
539{
540 struct tipc_bearer *b;
541 struct sk_buff *skb, *tmp;
542
543 if (skb_queue_empty(xmitq))
544 return;
545
546 rcu_read_lock();
547 b = bearer_get(net, bearer_id);
548 if (unlikely(!b))
549 __skb_queue_purge(xmitq);
550 skb_queue_walk_safe(xmitq, skb, tmp) {
551 __skb_dequeue(xmitq);
552 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
553#ifdef CONFIG_TIPC_CRYPTO
554 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
555 if (skb)
556#endif
557 b->media->send_msg(net, skb, b, dst);
558 } else {
559 kfree_skb(skb);
560 }
561 }
562 rcu_read_unlock();
563}
564
565/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
566 */
567void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
568 struct sk_buff_head *xmitq)
569{
570 struct tipc_net *tn = tipc_net(net);
571 struct tipc_media_addr *dst;
572 int net_id = tn->net_id;
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575 struct tipc_msg *hdr;
576
577 rcu_read_lock();
578 b = bearer_get(net, bearer_id);
579 if (unlikely(!b || !test_bit(0, &b->up)))
580 __skb_queue_purge(xmitq);
581 skb_queue_walk_safe(xmitq, skb, tmp) {
582 hdr = buf_msg(skb);
583 msg_set_non_seq(hdr, 1);
584 msg_set_mc_netid(hdr, net_id);
585 __skb_dequeue(xmitq);
586 dst = &b->bcast_addr;
587#ifdef CONFIG_TIPC_CRYPTO
588 tipc_crypto_xmit(net, &skb, b, dst, NULL);
589 if (skb)
590#endif
591 b->media->send_msg(net, skb, b, dst);
592 }
593 rcu_read_unlock();
594}
595
596/**
597 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
598 * @skb: the received message
599 * @dev: the net device that the packet was received on
600 * @pt: the packet_type structure which was used to register this handler
601 * @orig_dev: the original receive net device in case the device is a bond
602 *
603 * Accept only packets explicitly sent to this node, or broadcast packets;
604 * ignores packets sent using interface multicast, and traffic sent to other
605 * nodes (which can happen if interface is running in promiscuous mode).
606 */
607static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
608 struct packet_type *pt, struct net_device *orig_dev)
609{
610 struct tipc_bearer *b;
611
612 rcu_read_lock();
613 b = rcu_dereference(dev->tipc_ptr) ?:
614 rcu_dereference(orig_dev->tipc_ptr);
615 if (likely(b && test_bit(0, &b->up) &&
616 (skb->pkt_type <= PACKET_MULTICAST))) {
617 skb_mark_not_on_list(skb);
618 TIPC_SKB_CB(skb)->flags = 0;
619 tipc_rcv(dev_net(b->pt.dev), skb, b);
620 rcu_read_unlock();
621 return NET_RX_SUCCESS;
622 }
623 rcu_read_unlock();
624 kfree_skb(skb);
625 return NET_RX_DROP;
626}
627
628/**
629 * tipc_l2_device_event - handle device events from network device
630 * @nb: the context of the notification
631 * @evt: the type of event
632 * @ptr: the net device that the event was on
633 *
634 * This function is called by the Ethernet driver in case of link
635 * change event.
636 */
637static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
638 void *ptr)
639{
640 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
641 struct net *net = dev_net(dev);
642 struct tipc_bearer *b;
643
644 b = rtnl_dereference(dev->tipc_ptr);
645 if (!b)
646 return NOTIFY_DONE;
647
648 trace_tipc_l2_device_event(dev, b, evt);
649 switch (evt) {
650 case NETDEV_CHANGE:
651 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
652 test_and_set_bit_lock(0, &b->up);
653 break;
654 }
655 fallthrough;
656 case NETDEV_GOING_DOWN:
657 clear_bit_unlock(0, &b->up);
658 tipc_reset_bearer(net, b);
659 break;
660 case NETDEV_UP:
661 test_and_set_bit_lock(0, &b->up);
662 break;
663 case NETDEV_CHANGEMTU:
664 if (tipc_mtu_bad(dev, 0)) {
665 bearer_disable(net, b);
666 break;
667 }
668 b->mtu = dev->mtu;
669 tipc_reset_bearer(net, b);
670 break;
671 case NETDEV_CHANGEADDR:
672 b->media->raw2addr(b, &b->addr,
673 (char *)dev->dev_addr);
674 tipc_reset_bearer(net, b);
675 break;
676 case NETDEV_UNREGISTER:
677 case NETDEV_CHANGENAME:
678 bearer_disable(net, b);
679 break;
680 }
681 return NOTIFY_OK;
682}
683
684static struct notifier_block notifier = {
685 .notifier_call = tipc_l2_device_event,
686 .priority = 0,
687};
688
689int tipc_bearer_setup(void)
690{
691 return register_netdevice_notifier(¬ifier);
692}
693
694void tipc_bearer_cleanup(void)
695{
696 unregister_netdevice_notifier(¬ifier);
697}
698
699void tipc_bearer_stop(struct net *net)
700{
701 struct tipc_net *tn = net_generic(net, tipc_net_id);
702 struct tipc_bearer *b;
703 u32 i;
704
705 for (i = 0; i < MAX_BEARERS; i++) {
706 b = rtnl_dereference(tn->bearer_list[i]);
707 if (b) {
708 bearer_disable(net, b);
709 tn->bearer_list[i] = NULL;
710 }
711 }
712}
713
714void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
715{
716 struct net_device *dev = net->loopback_dev;
717 struct sk_buff *skb, *_skb;
718 int exp;
719
720 skb_queue_walk(pkts, _skb) {
721 skb = pskb_copy(_skb, GFP_ATOMIC);
722 if (!skb)
723 continue;
724
725 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
726 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
727 kfree_skb(skb);
728 continue;
729 }
730
731 skb_reset_network_header(skb);
732 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
733 dev->dev_addr, skb->len);
734 skb->dev = dev;
735 skb->pkt_type = PACKET_HOST;
736 skb->ip_summed = CHECKSUM_UNNECESSARY;
737 skb->protocol = eth_type_trans(skb, dev);
738 netif_rx_ni(skb);
739 }
740}
741
742static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
743 struct packet_type *pt, struct net_device *od)
744{
745 consume_skb(skb);
746 return NET_RX_SUCCESS;
747}
748
749int tipc_attach_loopback(struct net *net)
750{
751 struct net_device *dev = net->loopback_dev;
752 struct tipc_net *tn = tipc_net(net);
753
754 if (!dev)
755 return -ENODEV;
756
757 dev_hold(dev);
758 tn->loopback_pt.dev = dev;
759 tn->loopback_pt.type = htons(ETH_P_TIPC);
760 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
761 dev_add_pack(&tn->loopback_pt);
762 return 0;
763}
764
765void tipc_detach_loopback(struct net *net)
766{
767 struct tipc_net *tn = tipc_net(net);
768
769 dev_remove_pack(&tn->loopback_pt);
770 dev_put(net->loopback_dev);
771}
772
773/* Caller should hold rtnl_lock to protect the bearer */
774static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
775 struct tipc_bearer *bearer, int nlflags)
776{
777 void *hdr;
778 struct nlattr *attrs;
779 struct nlattr *prop;
780
781 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
782 nlflags, TIPC_NL_BEARER_GET);
783 if (!hdr)
784 return -EMSGSIZE;
785
786 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
787 if (!attrs)
788 goto msg_full;
789
790 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
791 goto attr_msg_full;
792
793 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
794 if (!prop)
795 goto prop_msg_full;
796 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
797 goto prop_msg_full;
798 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
799 goto prop_msg_full;
800 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
801 goto prop_msg_full;
802 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
803 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
804 goto prop_msg_full;
805
806 nla_nest_end(msg->skb, prop);
807
808#ifdef CONFIG_TIPC_MEDIA_UDP
809 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
810 if (tipc_udp_nl_add_bearer_data(msg, bearer))
811 goto attr_msg_full;
812 }
813#endif
814
815 nla_nest_end(msg->skb, attrs);
816 genlmsg_end(msg->skb, hdr);
817
818 return 0;
819
820prop_msg_full:
821 nla_nest_cancel(msg->skb, prop);
822attr_msg_full:
823 nla_nest_cancel(msg->skb, attrs);
824msg_full:
825 genlmsg_cancel(msg->skb, hdr);
826
827 return -EMSGSIZE;
828}
829
830int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
831{
832 int err;
833 int i = cb->args[0];
834 struct tipc_bearer *bearer;
835 struct tipc_nl_msg msg;
836 struct net *net = sock_net(skb->sk);
837 struct tipc_net *tn = net_generic(net, tipc_net_id);
838
839 if (i == MAX_BEARERS)
840 return 0;
841
842 msg.skb = skb;
843 msg.portid = NETLINK_CB(cb->skb).portid;
844 msg.seq = cb->nlh->nlmsg_seq;
845
846 rtnl_lock();
847 for (i = 0; i < MAX_BEARERS; i++) {
848 bearer = rtnl_dereference(tn->bearer_list[i]);
849 if (!bearer)
850 continue;
851
852 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
853 if (err)
854 break;
855 }
856 rtnl_unlock();
857
858 cb->args[0] = i;
859 return skb->len;
860}
861
862int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
863{
864 int err;
865 char *name;
866 struct sk_buff *rep;
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
870 struct net *net = genl_info_net(info);
871
872 if (!info->attrs[TIPC_NLA_BEARER])
873 return -EINVAL;
874
875 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
876 info->attrs[TIPC_NLA_BEARER],
877 tipc_nl_bearer_policy, info->extack);
878 if (err)
879 return err;
880
881 if (!attrs[TIPC_NLA_BEARER_NAME])
882 return -EINVAL;
883 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
884
885 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
886 if (!rep)
887 return -ENOMEM;
888
889 msg.skb = rep;
890 msg.portid = info->snd_portid;
891 msg.seq = info->snd_seq;
892
893 rtnl_lock();
894 bearer = tipc_bearer_find(net, name);
895 if (!bearer) {
896 err = -EINVAL;
897 goto err_out;
898 }
899
900 err = __tipc_nl_add_bearer(&msg, bearer, 0);
901 if (err)
902 goto err_out;
903 rtnl_unlock();
904
905 return genlmsg_reply(rep, info);
906err_out:
907 rtnl_unlock();
908 nlmsg_free(rep);
909
910 return err;
911}
912
913int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
914{
915 int err;
916 char *name;
917 struct tipc_bearer *bearer;
918 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
919 struct net *net = sock_net(skb->sk);
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
933 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
934
935 bearer = tipc_bearer_find(net, name);
936 if (!bearer)
937 return -EINVAL;
938
939 bearer_disable(net, bearer);
940
941 return 0;
942}
943
944int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
945{
946 int err;
947
948 rtnl_lock();
949 err = __tipc_nl_bearer_disable(skb, info);
950 rtnl_unlock();
951
952 return err;
953}
954
955int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
956{
957 int err;
958 char *bearer;
959 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
960 struct net *net = sock_net(skb->sk);
961 u32 domain = 0;
962 u32 prio;
963
964 prio = TIPC_MEDIA_LINK_PRI;
965
966 if (!info->attrs[TIPC_NLA_BEARER])
967 return -EINVAL;
968
969 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
970 info->attrs[TIPC_NLA_BEARER],
971 tipc_nl_bearer_policy, info->extack);
972 if (err)
973 return err;
974
975 if (!attrs[TIPC_NLA_BEARER_NAME])
976 return -EINVAL;
977
978 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
979
980 if (attrs[TIPC_NLA_BEARER_DOMAIN])
981 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
982
983 if (attrs[TIPC_NLA_BEARER_PROP]) {
984 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
985
986 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
987 props);
988 if (err)
989 return err;
990
991 if (props[TIPC_NLA_PROP_PRIO])
992 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
993 }
994
995 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
996}
997
998int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
999{
1000 int err;
1001
1002 rtnl_lock();
1003 err = __tipc_nl_bearer_enable(skb, info);
1004 rtnl_unlock();
1005
1006 return err;
1007}
1008
1009int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1010{
1011 int err;
1012 char *name;
1013 struct tipc_bearer *b;
1014 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1015 struct net *net = sock_net(skb->sk);
1016
1017 if (!info->attrs[TIPC_NLA_BEARER])
1018 return -EINVAL;
1019
1020 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1021 info->attrs[TIPC_NLA_BEARER],
1022 tipc_nl_bearer_policy, info->extack);
1023 if (err)
1024 return err;
1025
1026 if (!attrs[TIPC_NLA_BEARER_NAME])
1027 return -EINVAL;
1028 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1029
1030 rtnl_lock();
1031 b = tipc_bearer_find(net, name);
1032 if (!b) {
1033 rtnl_unlock();
1034 return -EINVAL;
1035 }
1036
1037#ifdef CONFIG_TIPC_MEDIA_UDP
1038 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1039 err = tipc_udp_nl_bearer_add(b,
1040 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1041 if (err) {
1042 rtnl_unlock();
1043 return err;
1044 }
1045 }
1046#endif
1047 rtnl_unlock();
1048
1049 return 0;
1050}
1051
1052int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1053{
1054 struct tipc_bearer *b;
1055 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1056 struct net *net = sock_net(skb->sk);
1057 char *name;
1058 int err;
1059
1060 if (!info->attrs[TIPC_NLA_BEARER])
1061 return -EINVAL;
1062
1063 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1064 info->attrs[TIPC_NLA_BEARER],
1065 tipc_nl_bearer_policy, info->extack);
1066 if (err)
1067 return err;
1068
1069 if (!attrs[TIPC_NLA_BEARER_NAME])
1070 return -EINVAL;
1071 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1072
1073 b = tipc_bearer_find(net, name);
1074 if (!b)
1075 return -EINVAL;
1076
1077 if (attrs[TIPC_NLA_BEARER_PROP]) {
1078 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1079
1080 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1081 props);
1082 if (err)
1083 return err;
1084
1085 if (props[TIPC_NLA_PROP_TOL]) {
1086 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1087 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1088 }
1089 if (props[TIPC_NLA_PROP_PRIO])
1090 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1091 if (props[TIPC_NLA_PROP_WIN])
1092 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1093 if (props[TIPC_NLA_PROP_MTU]) {
1094 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1095 return -EINVAL;
1096#ifdef CONFIG_TIPC_MEDIA_UDP
1097 if (tipc_udp_mtu_bad(nla_get_u32
1098 (props[TIPC_NLA_PROP_MTU])))
1099 return -EINVAL;
1100 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1101 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1102#endif
1103 }
1104 }
1105
1106 return 0;
1107}
1108
1109int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1110{
1111 int err;
1112
1113 rtnl_lock();
1114 err = __tipc_nl_bearer_set(skb, info);
1115 rtnl_unlock();
1116
1117 return err;
1118}
1119
1120static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1121 struct tipc_media *media, int nlflags)
1122{
1123 void *hdr;
1124 struct nlattr *attrs;
1125 struct nlattr *prop;
1126
1127 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1128 nlflags, TIPC_NL_MEDIA_GET);
1129 if (!hdr)
1130 return -EMSGSIZE;
1131
1132 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1133 if (!attrs)
1134 goto msg_full;
1135
1136 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1137 goto attr_msg_full;
1138
1139 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1140 if (!prop)
1141 goto prop_msg_full;
1142 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1143 goto prop_msg_full;
1144 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1145 goto prop_msg_full;
1146 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1147 goto prop_msg_full;
1148 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1149 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1150 goto prop_msg_full;
1151
1152 nla_nest_end(msg->skb, prop);
1153 nla_nest_end(msg->skb, attrs);
1154 genlmsg_end(msg->skb, hdr);
1155
1156 return 0;
1157
1158prop_msg_full:
1159 nla_nest_cancel(msg->skb, prop);
1160attr_msg_full:
1161 nla_nest_cancel(msg->skb, attrs);
1162msg_full:
1163 genlmsg_cancel(msg->skb, hdr);
1164
1165 return -EMSGSIZE;
1166}
1167
1168int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1169{
1170 int err;
1171 int i = cb->args[0];
1172 struct tipc_nl_msg msg;
1173
1174 if (i == MAX_MEDIA)
1175 return 0;
1176
1177 msg.skb = skb;
1178 msg.portid = NETLINK_CB(cb->skb).portid;
1179 msg.seq = cb->nlh->nlmsg_seq;
1180
1181 rtnl_lock();
1182 for (; media_info_array[i] != NULL; i++) {
1183 err = __tipc_nl_add_media(&msg, media_info_array[i],
1184 NLM_F_MULTI);
1185 if (err)
1186 break;
1187 }
1188 rtnl_unlock();
1189
1190 cb->args[0] = i;
1191 return skb->len;
1192}
1193
1194int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1195{
1196 int err;
1197 char *name;
1198 struct tipc_nl_msg msg;
1199 struct tipc_media *media;
1200 struct sk_buff *rep;
1201 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1202
1203 if (!info->attrs[TIPC_NLA_MEDIA])
1204 return -EINVAL;
1205
1206 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1207 info->attrs[TIPC_NLA_MEDIA],
1208 tipc_nl_media_policy, info->extack);
1209 if (err)
1210 return err;
1211
1212 if (!attrs[TIPC_NLA_MEDIA_NAME])
1213 return -EINVAL;
1214 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1215
1216 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1217 if (!rep)
1218 return -ENOMEM;
1219
1220 msg.skb = rep;
1221 msg.portid = info->snd_portid;
1222 msg.seq = info->snd_seq;
1223
1224 rtnl_lock();
1225 media = tipc_media_find(name);
1226 if (!media) {
1227 err = -EINVAL;
1228 goto err_out;
1229 }
1230
1231 err = __tipc_nl_add_media(&msg, media, 0);
1232 if (err)
1233 goto err_out;
1234 rtnl_unlock();
1235
1236 return genlmsg_reply(rep, info);
1237err_out:
1238 rtnl_unlock();
1239 nlmsg_free(rep);
1240
1241 return err;
1242}
1243
1244int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1245{
1246 int err;
1247 char *name;
1248 struct tipc_media *m;
1249 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1250
1251 if (!info->attrs[TIPC_NLA_MEDIA])
1252 return -EINVAL;
1253
1254 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1255 info->attrs[TIPC_NLA_MEDIA],
1256 tipc_nl_media_policy, info->extack);
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 m = tipc_media_find(name);
1263 if (!m)
1264 return -EINVAL;
1265
1266 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1267 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1268
1269 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1270 props);
1271 if (err)
1272 return err;
1273
1274 if (props[TIPC_NLA_PROP_TOL])
1275 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1276 if (props[TIPC_NLA_PROP_PRIO])
1277 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1278 if (props[TIPC_NLA_PROP_WIN])
1279 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1280 if (props[TIPC_NLA_PROP_MTU]) {
1281 if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1282 return -EINVAL;
1283#ifdef CONFIG_TIPC_MEDIA_UDP
1284 if (tipc_udp_mtu_bad(nla_get_u32
1285 (props[TIPC_NLA_PROP_MTU])))
1286 return -EINVAL;
1287 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1288#endif
1289 }
1290 }
1291
1292 return 0;
1293}
1294
1295int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1296{
1297 int err;
1298
1299 rtnl_lock();
1300 err = __tipc_nl_media_set(skb, info);
1301 rtnl_unlock();
1302
1303 return err;
1304}
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}