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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
47#define MAX_ADDR_STR 60
48
49static struct tipc_media * const media_info_array[] = {
50 ð_media_info,
51#ifdef CONFIG_TIPC_MEDIA_IB
52 &ib_media_info,
53#endif
54#ifdef CONFIG_TIPC_MEDIA_UDP
55 &udp_media_info,
56#endif
57 NULL
58};
59
60static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
61{
62 struct tipc_net *tn = tipc_net(net);
63
64 return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
65}
66
67static void bearer_disable(struct net *net, struct tipc_bearer *b);
68
69/**
70 * tipc_media_find - locates specified media object by name
71 */
72struct tipc_media *tipc_media_find(const char *name)
73{
74 u32 i;
75
76 for (i = 0; media_info_array[i] != NULL; i++) {
77 if (!strcmp(media_info_array[i]->name, name))
78 break;
79 }
80 return media_info_array[i];
81}
82
83/**
84 * media_find_id - locates specified media object by type identifier
85 */
86static struct tipc_media *media_find_id(u8 type)
87{
88 u32 i;
89
90 for (i = 0; media_info_array[i] != NULL; i++) {
91 if (media_info_array[i]->type_id == type)
92 break;
93 }
94 return media_info_array[i];
95}
96
97/**
98 * tipc_media_addr_printf - record media address in print buffer
99 */
100void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
101{
102 char addr_str[MAX_ADDR_STR];
103 struct tipc_media *m;
104 int ret;
105
106 m = media_find_id(a->media_id);
107
108 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
109 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
110 else {
111 u32 i;
112
113 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
114 for (i = 0; i < sizeof(a->value); i++)
115 ret += scnprintf(buf - ret, len + ret,
116 "-%02x", a->value[i]);
117 }
118}
119
120/**
121 * bearer_name_validate - validate & (optionally) deconstruct bearer name
122 * @name: ptr to bearer name string
123 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
124 *
125 * Returns 1 if bearer name is valid, otherwise 0.
126 */
127static int bearer_name_validate(const char *name,
128 struct tipc_bearer_names *name_parts)
129{
130 char name_copy[TIPC_MAX_BEARER_NAME];
131 char *media_name;
132 char *if_name;
133 u32 media_len;
134 u32 if_len;
135
136 /* copy bearer name & ensure length is OK */
137 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
138 /* need above in case non-Posix strncpy() doesn't pad with nulls */
139 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
140 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
141 return 0;
142
143 /* ensure all component parts of bearer name are present */
144 media_name = name_copy;
145 if_name = strchr(media_name, ':');
146 if (if_name == NULL)
147 return 0;
148 *(if_name++) = 0;
149 media_len = if_name - media_name;
150 if_len = strlen(if_name) + 1;
151
152 /* validate component parts of bearer name */
153 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
154 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
155 return 0;
156
157 /* return bearer name components, if necessary */
158 if (name_parts) {
159 strcpy(name_parts->media_name, media_name);
160 strcpy(name_parts->if_name, if_name);
161 }
162 return 1;
163}
164
165/**
166 * tipc_bearer_find - locates bearer object with matching bearer name
167 */
168struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
169{
170 struct tipc_net *tn = net_generic(net, tipc_net_id);
171 struct tipc_bearer *b;
172 u32 i;
173
174 for (i = 0; i < MAX_BEARERS; i++) {
175 b = rtnl_dereference(tn->bearer_list[i]);
176 if (b && (!strcmp(b->name, name)))
177 return b;
178 }
179 return NULL;
180}
181
182/* tipc_bearer_get_name - get the bearer name from its id.
183 * @net: network namespace
184 * @name: a pointer to the buffer where the name will be stored.
185 * @bearer_id: the id to get the name from.
186 */
187int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
188{
189 struct tipc_net *tn = tipc_net(net);
190 struct tipc_bearer *b;
191
192 if (bearer_id >= MAX_BEARERS)
193 return -EINVAL;
194
195 b = rtnl_dereference(tn->bearer_list[bearer_id]);
196 if (!b)
197 return -EINVAL;
198
199 strcpy(name, b->name);
200 return 0;
201}
202
203void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
204{
205 struct tipc_net *tn = net_generic(net, tipc_net_id);
206 struct tipc_bearer *b;
207
208 rcu_read_lock();
209 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
210 if (b)
211 tipc_disc_add_dest(b->link_req);
212 rcu_read_unlock();
213}
214
215void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
216{
217 struct tipc_net *tn = net_generic(net, tipc_net_id);
218 struct tipc_bearer *b;
219
220 rcu_read_lock();
221 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
222 if (b)
223 tipc_disc_remove_dest(b->link_req);
224 rcu_read_unlock();
225}
226
227/**
228 * tipc_enable_bearer - enable bearer with the given name
229 */
230static int tipc_enable_bearer(struct net *net, const char *name,
231 u32 disc_domain, u32 priority,
232 struct nlattr *attr[])
233{
234 struct tipc_net *tn = net_generic(net, tipc_net_id);
235 struct tipc_bearer *b;
236 struct tipc_media *m;
237 struct tipc_bearer_names b_names;
238 struct sk_buff *skb;
239 char addr_string[16];
240 u32 bearer_id;
241 u32 with_this_prio;
242 u32 i;
243 int res = -EINVAL;
244
245 if (!tn->own_addr) {
246 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
247 name);
248 return -ENOPROTOOPT;
249 }
250 if (!bearer_name_validate(name, &b_names)) {
251 pr_warn("Bearer <%s> rejected, illegal name\n", name);
252 return -EINVAL;
253 }
254 if (tipc_addr_domain_valid(disc_domain) &&
255 (disc_domain != tn->own_addr)) {
256 if (tipc_in_scope(disc_domain, tn->own_addr)) {
257 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
258 res = 0; /* accept any node in own cluster */
259 } else if (in_own_cluster_exact(net, disc_domain))
260 res = 0; /* accept specified node in own cluster */
261 }
262 if (res) {
263 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
264 name);
265 return -EINVAL;
266 }
267 if ((priority > TIPC_MAX_LINK_PRI) &&
268 (priority != TIPC_MEDIA_LINK_PRI)) {
269 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
270 return -EINVAL;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
276 name, b_names.media_name);
277 return -EINVAL;
278 }
279
280 if (priority == TIPC_MEDIA_LINK_PRI)
281 priority = m->priority;
282
283restart:
284 bearer_id = MAX_BEARERS;
285 with_this_prio = 1;
286 for (i = MAX_BEARERS; 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 pr_warn("Bearer <%s> rejected, already enabled\n",
294 name);
295 return -EINVAL;
296 }
297 if ((b->priority == priority) &&
298 (++with_this_prio > 2)) {
299 if (priority-- == 0) {
300 pr_warn("Bearer <%s> rejected, duplicate priority\n",
301 name);
302 return -EINVAL;
303 }
304 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
305 name, priority + 1, priority);
306 goto restart;
307 }
308 }
309 if (bearer_id >= MAX_BEARERS) {
310 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
311 name, MAX_BEARERS);
312 return -EINVAL;
313 }
314
315 b = kzalloc(sizeof(*b), GFP_ATOMIC);
316 if (!b)
317 return -ENOMEM;
318
319 strcpy(b->name, name);
320 b->media = m;
321 res = m->enable_media(net, b, attr);
322 if (res) {
323 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
324 name, -res);
325 return -EINVAL;
326 }
327
328 b->identity = bearer_id;
329 b->tolerance = m->tolerance;
330 b->window = m->window;
331 b->domain = disc_domain;
332 b->net_plane = bearer_id + 'A';
333 b->priority = priority;
334 test_and_set_bit_lock(0, &b->up);
335
336 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
337 if (res) {
338 bearer_disable(net, b);
339 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
340 name);
341 return -EINVAL;
342 }
343
344 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
345 if (skb)
346 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
347
348 if (tipc_mon_create(net, bearer_id))
349 return -ENOMEM;
350
351 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
352 name,
353 tipc_addr_string_fill(addr_string, disc_domain), priority);
354 return res;
355}
356
357/**
358 * tipc_reset_bearer - Reset all links established over this bearer
359 */
360static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
361{
362 pr_info("Resetting bearer <%s>\n", b->name);
363 tipc_node_delete_links(net, b->identity);
364 tipc_disc_reset(net, b);
365 return 0;
366}
367
368/* tipc_bearer_reset_all - reset all links on all bearers
369 */
370void tipc_bearer_reset_all(struct net *net)
371{
372 struct tipc_bearer *b;
373 int i;
374
375 for (i = 0; i < MAX_BEARERS; i++) {
376 b = bearer_get(net, i);
377 if (b)
378 clear_bit_unlock(0, &b->up);
379 }
380 for (i = 0; i < MAX_BEARERS; i++) {
381 b = bearer_get(net, i);
382 if (b)
383 tipc_reset_bearer(net, b);
384 }
385 for (i = 0; i < MAX_BEARERS; i++) {
386 b = bearer_get(net, i);
387 if (b)
388 test_and_set_bit_lock(0, &b->up);
389 }
390}
391
392/**
393 * bearer_disable
394 *
395 * Note: This routine assumes caller holds RTNL lock.
396 */
397static void bearer_disable(struct net *net, struct tipc_bearer *b)
398{
399 struct tipc_net *tn = tipc_net(net);
400 int bearer_id = b->identity;
401
402 pr_info("Disabling bearer <%s>\n", b->name);
403 clear_bit_unlock(0, &b->up);
404 tipc_node_delete_links(net, bearer_id);
405 b->media->disable_media(b);
406 RCU_INIT_POINTER(b->media_ptr, NULL);
407 if (b->link_req)
408 tipc_disc_delete(b->link_req);
409 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
410 kfree_rcu(b, rcu);
411 tipc_mon_delete(net, bearer_id);
412}
413
414int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
415 struct nlattr *attr[])
416{
417 struct net_device *dev;
418 char *driver_name = strchr((const char *)b->name, ':') + 1;
419
420 /* Find device with specified name */
421 dev = dev_get_by_name(net, driver_name);
422 if (!dev)
423 return -ENODEV;
424 if (tipc_mtu_bad(dev, 0)) {
425 dev_put(dev);
426 return -EINVAL;
427 }
428
429 /* Associate TIPC bearer with L2 bearer */
430 rcu_assign_pointer(b->media_ptr, dev);
431 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
432 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
433 b->bcast_addr.media_id = b->media->type_id;
434 b->bcast_addr.broadcast = 1;
435 b->mtu = dev->mtu;
436 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
437 rcu_assign_pointer(dev->tipc_ptr, b);
438 return 0;
439}
440
441/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
442 *
443 * Mark L2 bearer as inactive so that incoming buffers are thrown away
444 */
445void tipc_disable_l2_media(struct tipc_bearer *b)
446{
447 struct net_device *dev;
448
449 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
450 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
451 synchronize_net();
452 dev_put(dev);
453}
454
455/**
456 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
457 * @skb: the packet to be sent
458 * @b: the bearer through which the packet is to be sent
459 * @dest: peer destination address
460 */
461int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
462 struct tipc_bearer *b, struct tipc_media_addr *dest)
463{
464 struct net_device *dev;
465 int delta;
466
467 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
468 if (!dev)
469 return 0;
470
471 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
472 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
473 kfree_skb(skb);
474 return 0;
475 }
476 skb_reset_network_header(skb);
477 skb->dev = dev;
478 skb->protocol = htons(ETH_P_TIPC);
479 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
480 dev->dev_addr, skb->len);
481 dev_queue_xmit(skb);
482 return 0;
483}
484
485int tipc_bearer_mtu(struct net *net, u32 bearer_id)
486{
487 int mtu = 0;
488 struct tipc_bearer *b;
489
490 rcu_read_lock();
491 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
492 if (b)
493 mtu = b->mtu;
494 rcu_read_unlock();
495 return mtu;
496}
497
498/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
499 */
500void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
501 struct sk_buff *skb,
502 struct tipc_media_addr *dest)
503{
504 struct tipc_msg *hdr = buf_msg(skb);
505 struct tipc_bearer *b;
506
507 rcu_read_lock();
508 b = bearer_get(net, bearer_id);
509 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
510 b->media->send_msg(net, skb, b, dest);
511 else
512 kfree_skb(skb);
513 rcu_read_unlock();
514}
515
516/* tipc_bearer_xmit() -send buffer to destination over bearer
517 */
518void tipc_bearer_xmit(struct net *net, u32 bearer_id,
519 struct sk_buff_head *xmitq,
520 struct tipc_media_addr *dst)
521{
522 struct tipc_bearer *b;
523 struct sk_buff *skb, *tmp;
524
525 if (skb_queue_empty(xmitq))
526 return;
527
528 rcu_read_lock();
529 b = bearer_get(net, bearer_id);
530 if (unlikely(!b))
531 __skb_queue_purge(xmitq);
532 skb_queue_walk_safe(xmitq, skb, tmp) {
533 __skb_dequeue(xmitq);
534 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
535 b->media->send_msg(net, skb, b, dst);
536 else
537 kfree_skb(skb);
538 }
539 rcu_read_unlock();
540}
541
542/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
543 */
544void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
545 struct sk_buff_head *xmitq)
546{
547 struct tipc_net *tn = tipc_net(net);
548 int net_id = tn->net_id;
549 struct tipc_bearer *b;
550 struct sk_buff *skb, *tmp;
551 struct tipc_msg *hdr;
552
553 rcu_read_lock();
554 b = bearer_get(net, bearer_id);
555 if (unlikely(!b || !test_bit(0, &b->up)))
556 __skb_queue_purge(xmitq);
557 skb_queue_walk_safe(xmitq, skb, tmp) {
558 hdr = buf_msg(skb);
559 msg_set_non_seq(hdr, 1);
560 msg_set_mc_netid(hdr, net_id);
561 __skb_dequeue(xmitq);
562 b->media->send_msg(net, skb, b, &b->bcast_addr);
563 }
564 rcu_read_unlock();
565}
566
567/**
568 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
569 * @buf: the received packet
570 * @dev: the net device that the packet was received on
571 * @pt: the packet_type structure which was used to register this handler
572 * @orig_dev: the original receive net device in case the device is a bond
573 *
574 * Accept only packets explicitly sent to this node, or broadcast packets;
575 * ignores packets sent using interface multicast, and traffic sent to other
576 * nodes (which can happen if interface is running in promiscuous mode).
577 */
578static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
579 struct packet_type *pt, struct net_device *orig_dev)
580{
581 struct tipc_bearer *b;
582
583 rcu_read_lock();
584 b = rcu_dereference_rtnl(dev->tipc_ptr);
585 if (likely(b && test_bit(0, &b->up) &&
586 (skb->pkt_type <= PACKET_BROADCAST))) {
587 skb->next = NULL;
588 tipc_rcv(dev_net(dev), skb, b);
589 rcu_read_unlock();
590 return NET_RX_SUCCESS;
591 }
592 rcu_read_unlock();
593 kfree_skb(skb);
594 return NET_RX_DROP;
595}
596
597/**
598 * tipc_l2_device_event - handle device events from network device
599 * @nb: the context of the notification
600 * @evt: the type of event
601 * @ptr: the net device that the event was on
602 *
603 * This function is called by the Ethernet driver in case of link
604 * change event.
605 */
606static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
607 void *ptr)
608{
609 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
610 struct net *net = dev_net(dev);
611 struct tipc_bearer *b;
612
613 b = rtnl_dereference(dev->tipc_ptr);
614 if (!b)
615 return NOTIFY_DONE;
616
617 switch (evt) {
618 case NETDEV_CHANGE:
619 if (netif_carrier_ok(dev))
620 break;
621 case NETDEV_UP:
622 test_and_set_bit_lock(0, &b->up);
623 break;
624 case NETDEV_GOING_DOWN:
625 clear_bit_unlock(0, &b->up);
626 tipc_reset_bearer(net, b);
627 break;
628 case NETDEV_CHANGEMTU:
629 if (tipc_mtu_bad(dev, 0)) {
630 bearer_disable(net, b);
631 break;
632 }
633 b->mtu = dev->mtu;
634 tipc_reset_bearer(net, b);
635 break;
636 case NETDEV_CHANGEADDR:
637 b->media->raw2addr(b, &b->addr,
638 (char *)dev->dev_addr);
639 tipc_reset_bearer(net, b);
640 break;
641 case NETDEV_UNREGISTER:
642 case NETDEV_CHANGENAME:
643 bearer_disable(dev_net(dev), b);
644 break;
645 }
646 return NOTIFY_OK;
647}
648
649static struct packet_type tipc_packet_type __read_mostly = {
650 .type = htons(ETH_P_TIPC),
651 .func = tipc_l2_rcv_msg,
652};
653
654static struct notifier_block notifier = {
655 .notifier_call = tipc_l2_device_event,
656 .priority = 0,
657};
658
659int tipc_bearer_setup(void)
660{
661 int err;
662
663 err = register_netdevice_notifier(¬ifier);
664 if (err)
665 return err;
666 dev_add_pack(&tipc_packet_type);
667 return 0;
668}
669
670void tipc_bearer_cleanup(void)
671{
672 unregister_netdevice_notifier(¬ifier);
673 dev_remove_pack(&tipc_packet_type);
674}
675
676void tipc_bearer_stop(struct net *net)
677{
678 struct tipc_net *tn = net_generic(net, tipc_net_id);
679 struct tipc_bearer *b;
680 u32 i;
681
682 for (i = 0; i < MAX_BEARERS; i++) {
683 b = rtnl_dereference(tn->bearer_list[i]);
684 if (b) {
685 bearer_disable(net, b);
686 tn->bearer_list[i] = NULL;
687 }
688 }
689}
690
691/* Caller should hold rtnl_lock to protect the bearer */
692static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
693 struct tipc_bearer *bearer, int nlflags)
694{
695 void *hdr;
696 struct nlattr *attrs;
697 struct nlattr *prop;
698
699 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
700 nlflags, TIPC_NL_BEARER_GET);
701 if (!hdr)
702 return -EMSGSIZE;
703
704 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
705 if (!attrs)
706 goto msg_full;
707
708 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
709 goto attr_msg_full;
710
711 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
712 if (!prop)
713 goto prop_msg_full;
714 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
715 goto prop_msg_full;
716 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
717 goto prop_msg_full;
718 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
719 goto prop_msg_full;
720
721 nla_nest_end(msg->skb, prop);
722
723#ifdef CONFIG_TIPC_MEDIA_UDP
724 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
725 if (tipc_udp_nl_add_bearer_data(msg, bearer))
726 goto attr_msg_full;
727 }
728#endif
729
730 nla_nest_end(msg->skb, attrs);
731 genlmsg_end(msg->skb, hdr);
732
733 return 0;
734
735prop_msg_full:
736 nla_nest_cancel(msg->skb, prop);
737attr_msg_full:
738 nla_nest_cancel(msg->skb, attrs);
739msg_full:
740 genlmsg_cancel(msg->skb, hdr);
741
742 return -EMSGSIZE;
743}
744
745int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
746{
747 int err;
748 int i = cb->args[0];
749 struct tipc_bearer *bearer;
750 struct tipc_nl_msg msg;
751 struct net *net = sock_net(skb->sk);
752 struct tipc_net *tn = net_generic(net, tipc_net_id);
753
754 if (i == MAX_BEARERS)
755 return 0;
756
757 msg.skb = skb;
758 msg.portid = NETLINK_CB(cb->skb).portid;
759 msg.seq = cb->nlh->nlmsg_seq;
760
761 rtnl_lock();
762 for (i = 0; i < MAX_BEARERS; i++) {
763 bearer = rtnl_dereference(tn->bearer_list[i]);
764 if (!bearer)
765 continue;
766
767 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
768 if (err)
769 break;
770 }
771 rtnl_unlock();
772
773 cb->args[0] = i;
774 return skb->len;
775}
776
777int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
778{
779 int err;
780 char *name;
781 struct sk_buff *rep;
782 struct tipc_bearer *bearer;
783 struct tipc_nl_msg msg;
784 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
785 struct net *net = genl_info_net(info);
786
787 if (!info->attrs[TIPC_NLA_BEARER])
788 return -EINVAL;
789
790 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
791 info->attrs[TIPC_NLA_BEARER],
792 tipc_nl_bearer_policy);
793 if (err)
794 return err;
795
796 if (!attrs[TIPC_NLA_BEARER_NAME])
797 return -EINVAL;
798 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
799
800 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
801 if (!rep)
802 return -ENOMEM;
803
804 msg.skb = rep;
805 msg.portid = info->snd_portid;
806 msg.seq = info->snd_seq;
807
808 rtnl_lock();
809 bearer = tipc_bearer_find(net, name);
810 if (!bearer) {
811 err = -EINVAL;
812 goto err_out;
813 }
814
815 err = __tipc_nl_add_bearer(&msg, bearer, 0);
816 if (err)
817 goto err_out;
818 rtnl_unlock();
819
820 return genlmsg_reply(rep, info);
821err_out:
822 rtnl_unlock();
823 nlmsg_free(rep);
824
825 return err;
826}
827
828int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
829{
830 int err;
831 char *name;
832 struct tipc_bearer *bearer;
833 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
834 struct net *net = sock_net(skb->sk);
835
836 if (!info->attrs[TIPC_NLA_BEARER])
837 return -EINVAL;
838
839 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
840 info->attrs[TIPC_NLA_BEARER],
841 tipc_nl_bearer_policy);
842 if (err)
843 return err;
844
845 if (!attrs[TIPC_NLA_BEARER_NAME])
846 return -EINVAL;
847
848 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
849
850 rtnl_lock();
851 bearer = tipc_bearer_find(net, name);
852 if (!bearer) {
853 rtnl_unlock();
854 return -EINVAL;
855 }
856
857 bearer_disable(net, bearer);
858 rtnl_unlock();
859
860 return 0;
861}
862
863int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
864{
865 int err;
866 char *bearer;
867 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
868 struct net *net = sock_net(skb->sk);
869 struct tipc_net *tn = net_generic(net, tipc_net_id);
870 u32 domain;
871 u32 prio;
872
873 prio = TIPC_MEDIA_LINK_PRI;
874 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
875
876 if (!info->attrs[TIPC_NLA_BEARER])
877 return -EINVAL;
878
879 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
880 info->attrs[TIPC_NLA_BEARER],
881 tipc_nl_bearer_policy);
882 if (err)
883 return err;
884
885 if (!attrs[TIPC_NLA_BEARER_NAME])
886 return -EINVAL;
887
888 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
889
890 if (attrs[TIPC_NLA_BEARER_DOMAIN])
891 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
892
893 if (attrs[TIPC_NLA_BEARER_PROP]) {
894 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
895
896 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
897 props);
898 if (err)
899 return err;
900
901 if (props[TIPC_NLA_PROP_PRIO])
902 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
903 }
904
905 rtnl_lock();
906 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
907 if (err) {
908 rtnl_unlock();
909 return err;
910 }
911 rtnl_unlock();
912
913 return 0;
914}
915
916int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
917{
918 int err;
919 char *name;
920 struct tipc_bearer *b;
921 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
922 struct net *net = sock_net(skb->sk);
923
924 if (!info->attrs[TIPC_NLA_BEARER])
925 return -EINVAL;
926
927 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
928 info->attrs[TIPC_NLA_BEARER],
929 tipc_nl_bearer_policy);
930 if (err)
931 return err;
932
933 if (!attrs[TIPC_NLA_BEARER_NAME])
934 return -EINVAL;
935 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
936
937 rtnl_lock();
938 b = tipc_bearer_find(net, name);
939 if (!b) {
940 rtnl_unlock();
941 return -EINVAL;
942 }
943
944#ifdef CONFIG_TIPC_MEDIA_UDP
945 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
946 err = tipc_udp_nl_bearer_add(b,
947 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
948 if (err) {
949 rtnl_unlock();
950 return err;
951 }
952 }
953#endif
954 rtnl_unlock();
955
956 return 0;
957}
958
959int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
960{
961 int err;
962 char *name;
963 struct tipc_bearer *b;
964 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
965 struct net *net = sock_net(skb->sk);
966
967 if (!info->attrs[TIPC_NLA_BEARER])
968 return -EINVAL;
969
970 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
971 info->attrs[TIPC_NLA_BEARER],
972 tipc_nl_bearer_policy);
973 if (err)
974 return err;
975
976 if (!attrs[TIPC_NLA_BEARER_NAME])
977 return -EINVAL;
978 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
979
980 rtnl_lock();
981 b = tipc_bearer_find(net, name);
982 if (!b) {
983 rtnl_unlock();
984 return -EINVAL;
985 }
986
987 if (attrs[TIPC_NLA_BEARER_PROP]) {
988 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
989
990 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
991 props);
992 if (err) {
993 rtnl_unlock();
994 return err;
995 }
996
997 if (props[TIPC_NLA_PROP_TOL])
998 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
999 if (props[TIPC_NLA_PROP_PRIO])
1000 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1001 if (props[TIPC_NLA_PROP_WIN])
1002 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1003 }
1004 rtnl_unlock();
1005
1006 return 0;
1007}
1008
1009static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1010 struct tipc_media *media, int nlflags)
1011{
1012 void *hdr;
1013 struct nlattr *attrs;
1014 struct nlattr *prop;
1015
1016 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1017 nlflags, TIPC_NL_MEDIA_GET);
1018 if (!hdr)
1019 return -EMSGSIZE;
1020
1021 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1022 if (!attrs)
1023 goto msg_full;
1024
1025 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1026 goto attr_msg_full;
1027
1028 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1029 if (!prop)
1030 goto prop_msg_full;
1031 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1032 goto prop_msg_full;
1033 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1034 goto prop_msg_full;
1035 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1036 goto prop_msg_full;
1037
1038 nla_nest_end(msg->skb, prop);
1039 nla_nest_end(msg->skb, attrs);
1040 genlmsg_end(msg->skb, hdr);
1041
1042 return 0;
1043
1044prop_msg_full:
1045 nla_nest_cancel(msg->skb, prop);
1046attr_msg_full:
1047 nla_nest_cancel(msg->skb, attrs);
1048msg_full:
1049 genlmsg_cancel(msg->skb, hdr);
1050
1051 return -EMSGSIZE;
1052}
1053
1054int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1055{
1056 int err;
1057 int i = cb->args[0];
1058 struct tipc_nl_msg msg;
1059
1060 if (i == MAX_MEDIA)
1061 return 0;
1062
1063 msg.skb = skb;
1064 msg.portid = NETLINK_CB(cb->skb).portid;
1065 msg.seq = cb->nlh->nlmsg_seq;
1066
1067 rtnl_lock();
1068 for (; media_info_array[i] != NULL; i++) {
1069 err = __tipc_nl_add_media(&msg, media_info_array[i],
1070 NLM_F_MULTI);
1071 if (err)
1072 break;
1073 }
1074 rtnl_unlock();
1075
1076 cb->args[0] = i;
1077 return skb->len;
1078}
1079
1080int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1081{
1082 int err;
1083 char *name;
1084 struct tipc_nl_msg msg;
1085 struct tipc_media *media;
1086 struct sk_buff *rep;
1087 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1088
1089 if (!info->attrs[TIPC_NLA_MEDIA])
1090 return -EINVAL;
1091
1092 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1093 info->attrs[TIPC_NLA_MEDIA],
1094 tipc_nl_media_policy);
1095 if (err)
1096 return err;
1097
1098 if (!attrs[TIPC_NLA_MEDIA_NAME])
1099 return -EINVAL;
1100 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1101
1102 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1103 if (!rep)
1104 return -ENOMEM;
1105
1106 msg.skb = rep;
1107 msg.portid = info->snd_portid;
1108 msg.seq = info->snd_seq;
1109
1110 rtnl_lock();
1111 media = tipc_media_find(name);
1112 if (!media) {
1113 err = -EINVAL;
1114 goto err_out;
1115 }
1116
1117 err = __tipc_nl_add_media(&msg, media, 0);
1118 if (err)
1119 goto err_out;
1120 rtnl_unlock();
1121
1122 return genlmsg_reply(rep, info);
1123err_out:
1124 rtnl_unlock();
1125 nlmsg_free(rep);
1126
1127 return err;
1128}
1129
1130int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1131{
1132 int err;
1133 char *name;
1134 struct tipc_media *m;
1135 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1136
1137 if (!info->attrs[TIPC_NLA_MEDIA])
1138 return -EINVAL;
1139
1140 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1141 info->attrs[TIPC_NLA_MEDIA],
1142 tipc_nl_media_policy);
1143
1144 if (!attrs[TIPC_NLA_MEDIA_NAME])
1145 return -EINVAL;
1146 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1147
1148 rtnl_lock();
1149 m = tipc_media_find(name);
1150 if (!m) {
1151 rtnl_unlock();
1152 return -EINVAL;
1153 }
1154
1155 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1156 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1157
1158 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1159 props);
1160 if (err) {
1161 rtnl_unlock();
1162 return err;
1163 }
1164
1165 if (props[TIPC_NLA_PROP_TOL])
1166 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1167 if (props[TIPC_NLA_PROP_PRIO])
1168 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1169 if (props[TIPC_NLA_PROP_WIN])
1170 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1171 }
1172 rtnl_unlock();
1173
1174 return 0;
1175}
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}