Loading...
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 * @name: name to locate
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 * @type: type identifier to locate
91 */
92static struct tipc_media *media_find_id(u8 type)
93{
94 u32 i;
95
96 for (i = 0; media_info_array[i] != NULL; i++) {
97 if (media_info_array[i]->type_id == type)
98 break;
99 }
100 return media_info_array[i];
101}
102
103/**
104 * tipc_media_addr_printf - record media address in print buffer
105 * @buf: output buffer
106 * @len: output buffer size remaining
107 * @a: input media address
108 */
109int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
110{
111 char addr_str[MAX_ADDR_STR];
112 struct tipc_media *m;
113 int ret;
114
115 m = media_find_id(a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf + ret, len - ret,
125 "-%x", a->value[i]);
126 }
127 return ret;
128}
129
130/**
131 * bearer_name_validate - validate & (optionally) deconstruct bearer name
132 * @name: ptr to bearer name string
133 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
134 *
135 * Return: 1 if bearer name is valid, otherwise 0.
136 */
137static int bearer_name_validate(const char *name,
138 struct tipc_bearer_names *name_parts)
139{
140 char name_copy[TIPC_MAX_BEARER_NAME];
141 char *media_name;
142 char *if_name;
143 u32 media_len;
144 u32 if_len;
145
146 /* copy bearer name & ensure length is OK */
147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0)
148 return 0;
149
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
153 if (if_name == NULL)
154 return 0;
155 *(if_name++) = 0;
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
158
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
162 return 0;
163
164 /* return bearer name components, if necessary */
165 if (name_parts) {
166 strcpy(name_parts->media_name, media_name);
167 strcpy(name_parts->if_name, if_name);
168 }
169 return 1;
170}
171
172/**
173 * tipc_bearer_find - locates bearer object with matching bearer name
174 * @net: the applicable net namespace
175 * @name: bearer name to locate
176 */
177struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
178{
179 struct tipc_net *tn = net_generic(net, tipc_net_id);
180 struct tipc_bearer *b;
181 u32 i;
182
183 for (i = 0; i < MAX_BEARERS; i++) {
184 b = rtnl_dereference(tn->bearer_list[i]);
185 if (b && (!strcmp(b->name, name)))
186 return b;
187 }
188 return NULL;
189}
190
191/* tipc_bearer_get_name - get the bearer name from its id.
192 * @net: network namespace
193 * @name: a pointer to the buffer where the name will be stored.
194 * @bearer_id: the id to get the name from.
195 */
196int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
197{
198 struct tipc_net *tn = tipc_net(net);
199 struct tipc_bearer *b;
200
201 if (bearer_id >= MAX_BEARERS)
202 return -EINVAL;
203
204 b = rtnl_dereference(tn->bearer_list[bearer_id]);
205 if (!b)
206 return -EINVAL;
207
208 strcpy(name, b->name);
209 return 0;
210}
211
212void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
213{
214 struct tipc_net *tn = net_generic(net, tipc_net_id);
215 struct tipc_bearer *b;
216
217 rcu_read_lock();
218 b = rcu_dereference(tn->bearer_list[bearer_id]);
219 if (b)
220 tipc_disc_add_dest(b->disc);
221 rcu_read_unlock();
222}
223
224void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
225{
226 struct tipc_net *tn = net_generic(net, tipc_net_id);
227 struct tipc_bearer *b;
228
229 rcu_read_lock();
230 b = rcu_dereference(tn->bearer_list[bearer_id]);
231 if (b)
232 tipc_disc_remove_dest(b->disc);
233 rcu_read_unlock();
234}
235
236/**
237 * tipc_enable_bearer - enable bearer with the given name
238 * @net: the applicable net namespace
239 * @name: bearer name to enable
240 * @disc_domain: bearer domain
241 * @prio: bearer priority
242 * @attr: nlattr array
243 * @extack: netlink extended ack
244 */
245static int tipc_enable_bearer(struct net *net, const char *name,
246 u32 disc_domain, u32 prio,
247 struct nlattr *attr[],
248 struct netlink_ext_ack *extack)
249{
250 struct tipc_net *tn = tipc_net(net);
251 struct tipc_bearer_names b_names;
252 int with_this_prio = 1;
253 struct tipc_bearer *b;
254 struct tipc_media *m;
255 struct sk_buff *skb;
256 int bearer_id = 0;
257 int res = -EINVAL;
258 char *errstr = "";
259 u32 i;
260
261 if (!bearer_name_validate(name, &b_names)) {
262 errstr = "illegal name";
263 NL_SET_ERR_MSG(extack, "Illegal name");
264 goto rejected;
265 }
266
267 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
268 errstr = "illegal priority";
269 NL_SET_ERR_MSG(extack, "Illegal priority");
270 goto rejected;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 errstr = "media not registered";
276 NL_SET_ERR_MSG(extack, "Media not registered");
277 goto rejected;
278 }
279
280 if (prio == TIPC_MEDIA_LINK_PRI)
281 prio = m->priority;
282
283 /* Check new bearer vs existing ones and find free bearer id if any */
284 bearer_id = MAX_BEARERS;
285 i = MAX_BEARERS;
286 while (i-- != 0) {
287 b = rtnl_dereference(tn->bearer_list[i]);
288 if (!b) {
289 bearer_id = i;
290 continue;
291 }
292 if (!strcmp(name, b->name)) {
293 errstr = "already enabled";
294 NL_SET_ERR_MSG(extack, "Already enabled");
295 goto rejected;
296 }
297
298 if (b->priority == prio &&
299 (++with_this_prio > 2)) {
300 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
301 name, prio);
302
303 if (prio == TIPC_MIN_LINK_PRI) {
304 errstr = "cannot adjust to lower";
305 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
306 goto rejected;
307 }
308
309 pr_warn("Bearer <%s>: trying with adjusted priority\n",
310 name);
311 prio--;
312 bearer_id = MAX_BEARERS;
313 i = MAX_BEARERS;
314 with_this_prio = 1;
315 }
316 }
317
318 if (bearer_id >= MAX_BEARERS) {
319 errstr = "max 3 bearers permitted";
320 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
321 goto rejected;
322 }
323
324 b = kzalloc(sizeof(*b), GFP_ATOMIC);
325 if (!b)
326 return -ENOMEM;
327
328 strcpy(b->name, name);
329 b->media = m;
330 res = m->enable_media(net, b, attr);
331 if (res) {
332 kfree(b);
333 errstr = "failed to enable media";
334 NL_SET_ERR_MSG(extack, "Failed to enable media");
335 goto rejected;
336 }
337
338 b->identity = bearer_id;
339 b->tolerance = m->tolerance;
340 b->min_win = m->min_win;
341 b->max_win = m->max_win;
342 b->domain = disc_domain;
343 b->net_plane = bearer_id + 'A';
344 b->priority = prio;
345 refcount_set(&b->refcnt, 1);
346
347 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
348 if (res) {
349 bearer_disable(net, b);
350 errstr = "failed to create discoverer";
351 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
352 goto rejected;
353 }
354
355 test_and_set_bit_lock(0, &b->up);
356 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
357 if (skb)
358 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
359
360 if (tipc_mon_create(net, bearer_id)) {
361 bearer_disable(net, b);
362 return -ENOMEM;
363 }
364
365 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
366
367 return res;
368rejected:
369 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
370 return res;
371}
372
373/**
374 * tipc_reset_bearer - Reset all links established over this bearer
375 * @net: the applicable net namespace
376 * @b: the target bearer
377 */
378static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
379{
380 pr_info("Resetting bearer <%s>\n", b->name);
381 tipc_node_delete_links(net, b->identity);
382 tipc_disc_reset(net, b);
383 return 0;
384}
385
386bool tipc_bearer_hold(struct tipc_bearer *b)
387{
388 return (b && refcount_inc_not_zero(&b->refcnt));
389}
390
391void tipc_bearer_put(struct tipc_bearer *b)
392{
393 if (b && refcount_dec_and_test(&b->refcnt))
394 kfree_rcu(b, rcu);
395}
396
397/**
398 * bearer_disable - disable this bearer
399 * @net: the applicable net namespace
400 * @b: the bearer to disable
401 *
402 * Note: This routine assumes caller holds RTNL lock.
403 */
404static void bearer_disable(struct net *net, struct tipc_bearer *b)
405{
406 struct tipc_net *tn = tipc_net(net);
407 int bearer_id = b->identity;
408
409 pr_info("Disabling bearer <%s>\n", b->name);
410 clear_bit_unlock(0, &b->up);
411 tipc_node_delete_links(net, bearer_id);
412 b->media->disable_media(b);
413 RCU_INIT_POINTER(b->media_ptr, NULL);
414 if (b->disc)
415 tipc_disc_delete(b->disc);
416 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
417 tipc_bearer_put(b);
418 tipc_mon_delete(net, bearer_id);
419}
420
421int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
422 struct nlattr *attr[])
423{
424 char *dev_name = strchr((const char *)b->name, ':') + 1;
425 int hwaddr_len = b->media->hwaddr_len;
426 u8 node_id[NODE_ID_LEN] = {0,};
427 struct net_device *dev;
428
429 /* Find device with specified name */
430 dev = dev_get_by_name(net, dev_name);
431 if (!dev)
432 return -ENODEV;
433 if (tipc_mtu_bad(dev, 0)) {
434 dev_put(dev);
435 return -EINVAL;
436 }
437 if (dev == net->loopback_dev) {
438 dev_put(dev);
439 pr_info("Enabling <%s> not permitted\n", b->name);
440 return -EINVAL;
441 }
442
443 /* Autoconfigure own node identity if needed */
444 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
445 memcpy(node_id, dev->dev_addr, hwaddr_len);
446 tipc_net_init(net, node_id, 0);
447 }
448 if (!tipc_own_id(net)) {
449 dev_put(dev);
450 pr_warn("Failed to obtain node identity\n");
451 return -EINVAL;
452 }
453
454 /* Associate TIPC bearer with L2 bearer */
455 rcu_assign_pointer(b->media_ptr, dev);
456 b->pt.dev = dev;
457 b->pt.type = htons(ETH_P_TIPC);
458 b->pt.func = tipc_l2_rcv_msg;
459 dev_add_pack(&b->pt);
460 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
461 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
462 b->bcast_addr.media_id = b->media->type_id;
463 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
464 b->mtu = dev->mtu;
465 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
466 rcu_assign_pointer(dev->tipc_ptr, b);
467 return 0;
468}
469
470/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
471 * @b: the target bearer
472 *
473 * Mark L2 bearer as inactive so that incoming buffers are thrown away
474 */
475void tipc_disable_l2_media(struct tipc_bearer *b)
476{
477 struct net_device *dev;
478
479 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
480 dev_remove_pack(&b->pt);
481 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
482 synchronize_net();
483 dev_put(dev);
484}
485
486/**
487 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
488 * @net: the associated network namespace
489 * @skb: the packet to be sent
490 * @b: the bearer through which the packet is to be sent
491 * @dest: peer destination address
492 */
493int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
494 struct tipc_bearer *b, struct tipc_media_addr *dest)
495{
496 struct net_device *dev;
497 int delta;
498
499 dev = (struct net_device *)rcu_dereference(b->media_ptr);
500 if (!dev)
501 return 0;
502
503 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
504 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
505 kfree_skb(skb);
506 return 0;
507 }
508 skb_reset_network_header(skb);
509 skb->dev = dev;
510 skb->protocol = htons(ETH_P_TIPC);
511 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
512 dev->dev_addr, skb->len);
513 dev_queue_xmit(skb);
514 return 0;
515}
516
517bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
518{
519 bool supp = false;
520 struct tipc_bearer *b;
521
522 rcu_read_lock();
523 b = bearer_get(net, bearer_id);
524 if (b)
525 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
526 rcu_read_unlock();
527 return supp;
528}
529
530int tipc_bearer_mtu(struct net *net, u32 bearer_id)
531{
532 int mtu = 0;
533 struct tipc_bearer *b;
534
535 rcu_read_lock();
536 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
537 if (b)
538 mtu = b->mtu;
539 rcu_read_unlock();
540 return mtu;
541}
542
543/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
544 */
545void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
546 struct sk_buff *skb,
547 struct tipc_media_addr *dest)
548{
549 struct tipc_msg *hdr = buf_msg(skb);
550 struct tipc_bearer *b;
551
552 rcu_read_lock();
553 b = bearer_get(net, bearer_id);
554 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
555#ifdef CONFIG_TIPC_CRYPTO
556 tipc_crypto_xmit(net, &skb, b, dest, NULL);
557 if (skb)
558#endif
559 b->media->send_msg(net, skb, b, dest);
560 } else {
561 kfree_skb(skb);
562 }
563 rcu_read_unlock();
564}
565
566/* tipc_bearer_xmit() -send buffer to destination over bearer
567 */
568void tipc_bearer_xmit(struct net *net, u32 bearer_id,
569 struct sk_buff_head *xmitq,
570 struct tipc_media_addr *dst,
571 struct tipc_node *__dnode)
572{
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575
576 if (skb_queue_empty(xmitq))
577 return;
578
579 rcu_read_lock();
580 b = bearer_get(net, bearer_id);
581 if (unlikely(!b))
582 __skb_queue_purge(xmitq);
583 skb_queue_walk_safe(xmitq, skb, tmp) {
584 __skb_dequeue(xmitq);
585 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
586#ifdef CONFIG_TIPC_CRYPTO
587 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
588 if (skb)
589#endif
590 b->media->send_msg(net, skb, b, dst);
591 } else {
592 kfree_skb(skb);
593 }
594 }
595 rcu_read_unlock();
596}
597
598/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
599 */
600void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
601 struct sk_buff_head *xmitq)
602{
603 struct tipc_net *tn = tipc_net(net);
604 struct tipc_media_addr *dst;
605 int net_id = tn->net_id;
606 struct tipc_bearer *b;
607 struct sk_buff *skb, *tmp;
608 struct tipc_msg *hdr;
609
610 rcu_read_lock();
611 b = bearer_get(net, bearer_id);
612 if (unlikely(!b || !test_bit(0, &b->up)))
613 __skb_queue_purge(xmitq);
614 skb_queue_walk_safe(xmitq, skb, tmp) {
615 hdr = buf_msg(skb);
616 msg_set_non_seq(hdr, 1);
617 msg_set_mc_netid(hdr, net_id);
618 __skb_dequeue(xmitq);
619 dst = &b->bcast_addr;
620#ifdef CONFIG_TIPC_CRYPTO
621 tipc_crypto_xmit(net, &skb, b, dst, NULL);
622 if (skb)
623#endif
624 b->media->send_msg(net, skb, b, dst);
625 }
626 rcu_read_unlock();
627}
628
629/**
630 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
631 * @skb: the received message
632 * @dev: the net device that the packet was received on
633 * @pt: the packet_type structure which was used to register this handler
634 * @orig_dev: the original receive net device in case the device is a bond
635 *
636 * Accept only packets explicitly sent to this node, or broadcast packets;
637 * ignores packets sent using interface multicast, and traffic sent to other
638 * nodes (which can happen if interface is running in promiscuous mode).
639 */
640static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
641 struct packet_type *pt, struct net_device *orig_dev)
642{
643 struct tipc_bearer *b;
644
645 rcu_read_lock();
646 b = rcu_dereference(dev->tipc_ptr) ?:
647 rcu_dereference(orig_dev->tipc_ptr);
648 if (likely(b && test_bit(0, &b->up) &&
649 (skb->pkt_type <= PACKET_MULTICAST))) {
650 skb_mark_not_on_list(skb);
651 TIPC_SKB_CB(skb)->flags = 0;
652 tipc_rcv(dev_net(b->pt.dev), skb, b);
653 rcu_read_unlock();
654 return NET_RX_SUCCESS;
655 }
656 rcu_read_unlock();
657 kfree_skb(skb);
658 return NET_RX_DROP;
659}
660
661/**
662 * tipc_l2_device_event - handle device events from network device
663 * @nb: the context of the notification
664 * @evt: the type of event
665 * @ptr: the net device that the event was on
666 *
667 * This function is called by the Ethernet driver in case of link
668 * change event.
669 */
670static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
671 void *ptr)
672{
673 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
674 struct net *net = dev_net(dev);
675 struct tipc_bearer *b;
676
677 b = rtnl_dereference(dev->tipc_ptr);
678 if (!b)
679 return NOTIFY_DONE;
680
681 trace_tipc_l2_device_event(dev, b, evt);
682 switch (evt) {
683 case NETDEV_CHANGE:
684 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
685 test_and_set_bit_lock(0, &b->up);
686 break;
687 }
688 fallthrough;
689 case NETDEV_GOING_DOWN:
690 clear_bit_unlock(0, &b->up);
691 tipc_reset_bearer(net, b);
692 break;
693 case NETDEV_UP:
694 test_and_set_bit_lock(0, &b->up);
695 break;
696 case NETDEV_CHANGEMTU:
697 if (tipc_mtu_bad(dev, 0)) {
698 bearer_disable(net, b);
699 break;
700 }
701 b->mtu = dev->mtu;
702 tipc_reset_bearer(net, b);
703 break;
704 case NETDEV_CHANGEADDR:
705 b->media->raw2addr(b, &b->addr,
706 (char *)dev->dev_addr);
707 tipc_reset_bearer(net, b);
708 break;
709 case NETDEV_UNREGISTER:
710 case NETDEV_CHANGENAME:
711 bearer_disable(net, b);
712 break;
713 }
714 return NOTIFY_OK;
715}
716
717static struct notifier_block notifier = {
718 .notifier_call = tipc_l2_device_event,
719 .priority = 0,
720};
721
722int tipc_bearer_setup(void)
723{
724 return register_netdevice_notifier(¬ifier);
725}
726
727void tipc_bearer_cleanup(void)
728{
729 unregister_netdevice_notifier(¬ifier);
730}
731
732void tipc_bearer_stop(struct net *net)
733{
734 struct tipc_net *tn = net_generic(net, tipc_net_id);
735 struct tipc_bearer *b;
736 u32 i;
737
738 for (i = 0; i < MAX_BEARERS; i++) {
739 b = rtnl_dereference(tn->bearer_list[i]);
740 if (b) {
741 bearer_disable(net, b);
742 tn->bearer_list[i] = NULL;
743 }
744 }
745}
746
747void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
748{
749 struct net_device *dev = net->loopback_dev;
750 struct sk_buff *skb, *_skb;
751 int exp;
752
753 skb_queue_walk(pkts, _skb) {
754 skb = pskb_copy(_skb, GFP_ATOMIC);
755 if (!skb)
756 continue;
757
758 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
759 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
760 kfree_skb(skb);
761 continue;
762 }
763
764 skb_reset_network_header(skb);
765 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
766 dev->dev_addr, skb->len);
767 skb->dev = dev;
768 skb->pkt_type = PACKET_HOST;
769 skb->ip_summed = CHECKSUM_UNNECESSARY;
770 skb->protocol = eth_type_trans(skb, dev);
771 netif_rx_ni(skb);
772 }
773}
774
775static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
776 struct packet_type *pt, struct net_device *od)
777{
778 consume_skb(skb);
779 return NET_RX_SUCCESS;
780}
781
782int tipc_attach_loopback(struct net *net)
783{
784 struct net_device *dev = net->loopback_dev;
785 struct tipc_net *tn = tipc_net(net);
786
787 if (!dev)
788 return -ENODEV;
789
790 dev_hold(dev);
791 tn->loopback_pt.dev = dev;
792 tn->loopback_pt.type = htons(ETH_P_TIPC);
793 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
794 dev_add_pack(&tn->loopback_pt);
795 return 0;
796}
797
798void tipc_detach_loopback(struct net *net)
799{
800 struct tipc_net *tn = tipc_net(net);
801
802 dev_remove_pack(&tn->loopback_pt);
803 dev_put(net->loopback_dev);
804}
805
806/* Caller should hold rtnl_lock to protect the bearer */
807static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
808 struct tipc_bearer *bearer, int nlflags)
809{
810 void *hdr;
811 struct nlattr *attrs;
812 struct nlattr *prop;
813
814 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
815 nlflags, TIPC_NL_BEARER_GET);
816 if (!hdr)
817 return -EMSGSIZE;
818
819 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
820 if (!attrs)
821 goto msg_full;
822
823 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
824 goto attr_msg_full;
825
826 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
827 if (!prop)
828 goto prop_msg_full;
829 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
830 goto prop_msg_full;
831 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
832 goto prop_msg_full;
833 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
834 goto prop_msg_full;
835 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
836 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
837 goto prop_msg_full;
838
839 nla_nest_end(msg->skb, prop);
840
841#ifdef CONFIG_TIPC_MEDIA_UDP
842 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
843 if (tipc_udp_nl_add_bearer_data(msg, bearer))
844 goto attr_msg_full;
845 }
846#endif
847
848 nla_nest_end(msg->skb, attrs);
849 genlmsg_end(msg->skb, hdr);
850
851 return 0;
852
853prop_msg_full:
854 nla_nest_cancel(msg->skb, prop);
855attr_msg_full:
856 nla_nest_cancel(msg->skb, attrs);
857msg_full:
858 genlmsg_cancel(msg->skb, hdr);
859
860 return -EMSGSIZE;
861}
862
863int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
864{
865 int err;
866 int i = cb->args[0];
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct net *net = sock_net(skb->sk);
870 struct tipc_net *tn = net_generic(net, tipc_net_id);
871
872 if (i == MAX_BEARERS)
873 return 0;
874
875 msg.skb = skb;
876 msg.portid = NETLINK_CB(cb->skb).portid;
877 msg.seq = cb->nlh->nlmsg_seq;
878
879 rtnl_lock();
880 for (i = 0; i < MAX_BEARERS; i++) {
881 bearer = rtnl_dereference(tn->bearer_list[i]);
882 if (!bearer)
883 continue;
884
885 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
886 if (err)
887 break;
888 }
889 rtnl_unlock();
890
891 cb->args[0] = i;
892 return skb->len;
893}
894
895int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
896{
897 int err;
898 char *name;
899 struct sk_buff *rep;
900 struct tipc_bearer *bearer;
901 struct tipc_nl_msg msg;
902 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
903 struct net *net = genl_info_net(info);
904
905 if (!info->attrs[TIPC_NLA_BEARER])
906 return -EINVAL;
907
908 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
909 info->attrs[TIPC_NLA_BEARER],
910 tipc_nl_bearer_policy, info->extack);
911 if (err)
912 return err;
913
914 if (!attrs[TIPC_NLA_BEARER_NAME])
915 return -EINVAL;
916 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
917
918 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
919 if (!rep)
920 return -ENOMEM;
921
922 msg.skb = rep;
923 msg.portid = info->snd_portid;
924 msg.seq = info->snd_seq;
925
926 rtnl_lock();
927 bearer = tipc_bearer_find(net, name);
928 if (!bearer) {
929 err = -EINVAL;
930 NL_SET_ERR_MSG(info->extack, "Bearer not found");
931 goto err_out;
932 }
933
934 err = __tipc_nl_add_bearer(&msg, bearer, 0);
935 if (err)
936 goto err_out;
937 rtnl_unlock();
938
939 return genlmsg_reply(rep, info);
940err_out:
941 rtnl_unlock();
942 nlmsg_free(rep);
943
944 return err;
945}
946
947int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
948{
949 int err;
950 char *name;
951 struct tipc_bearer *bearer;
952 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
953 struct net *net = sock_net(skb->sk);
954
955 if (!info->attrs[TIPC_NLA_BEARER])
956 return -EINVAL;
957
958 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
959 info->attrs[TIPC_NLA_BEARER],
960 tipc_nl_bearer_policy, info->extack);
961 if (err)
962 return err;
963
964 if (!attrs[TIPC_NLA_BEARER_NAME])
965 return -EINVAL;
966
967 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
968
969 bearer = tipc_bearer_find(net, name);
970 if (!bearer) {
971 NL_SET_ERR_MSG(info->extack, "Bearer not found");
972 return -EINVAL;
973 }
974
975 bearer_disable(net, bearer);
976
977 return 0;
978}
979
980int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
981{
982 int err;
983
984 rtnl_lock();
985 err = __tipc_nl_bearer_disable(skb, info);
986 rtnl_unlock();
987
988 return err;
989}
990
991int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
992{
993 int err;
994 char *bearer;
995 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
996 struct net *net = sock_net(skb->sk);
997 u32 domain = 0;
998 u32 prio;
999
1000 prio = TIPC_MEDIA_LINK_PRI;
1001
1002 if (!info->attrs[TIPC_NLA_BEARER])
1003 return -EINVAL;
1004
1005 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1006 info->attrs[TIPC_NLA_BEARER],
1007 tipc_nl_bearer_policy, info->extack);
1008 if (err)
1009 return err;
1010
1011 if (!attrs[TIPC_NLA_BEARER_NAME])
1012 return -EINVAL;
1013
1014 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1015
1016 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1017 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1018
1019 if (attrs[TIPC_NLA_BEARER_PROP]) {
1020 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1021
1022 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1023 props);
1024 if (err)
1025 return err;
1026
1027 if (props[TIPC_NLA_PROP_PRIO])
1028 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1029 }
1030
1031 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1032 info->extack);
1033}
1034
1035int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1036{
1037 int err;
1038
1039 rtnl_lock();
1040 err = __tipc_nl_bearer_enable(skb, info);
1041 rtnl_unlock();
1042
1043 return err;
1044}
1045
1046int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1047{
1048 int err;
1049 char *name;
1050 struct tipc_bearer *b;
1051 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1052 struct net *net = sock_net(skb->sk);
1053
1054 if (!info->attrs[TIPC_NLA_BEARER])
1055 return -EINVAL;
1056
1057 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1058 info->attrs[TIPC_NLA_BEARER],
1059 tipc_nl_bearer_policy, info->extack);
1060 if (err)
1061 return err;
1062
1063 if (!attrs[TIPC_NLA_BEARER_NAME])
1064 return -EINVAL;
1065 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1066
1067 rtnl_lock();
1068 b = tipc_bearer_find(net, name);
1069 if (!b) {
1070 rtnl_unlock();
1071 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1072 return -EINVAL;
1073 }
1074
1075#ifdef CONFIG_TIPC_MEDIA_UDP
1076 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1077 err = tipc_udp_nl_bearer_add(b,
1078 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1079 if (err) {
1080 rtnl_unlock();
1081 return err;
1082 }
1083 }
1084#endif
1085 rtnl_unlock();
1086
1087 return 0;
1088}
1089
1090int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1091{
1092 struct tipc_bearer *b;
1093 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1094 struct net *net = sock_net(skb->sk);
1095 char *name;
1096 int err;
1097
1098 if (!info->attrs[TIPC_NLA_BEARER])
1099 return -EINVAL;
1100
1101 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1102 info->attrs[TIPC_NLA_BEARER],
1103 tipc_nl_bearer_policy, info->extack);
1104 if (err)
1105 return err;
1106
1107 if (!attrs[TIPC_NLA_BEARER_NAME])
1108 return -EINVAL;
1109 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1110
1111 b = tipc_bearer_find(net, name);
1112 if (!b) {
1113 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1114 return -EINVAL;
1115 }
1116
1117 if (attrs[TIPC_NLA_BEARER_PROP]) {
1118 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1119
1120 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1121 props);
1122 if (err)
1123 return err;
1124
1125 if (props[TIPC_NLA_PROP_TOL]) {
1126 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1127 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1128 }
1129 if (props[TIPC_NLA_PROP_PRIO])
1130 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1131 if (props[TIPC_NLA_PROP_WIN])
1132 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1133 if (props[TIPC_NLA_PROP_MTU]) {
1134 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1135 NL_SET_ERR_MSG(info->extack,
1136 "MTU property is unsupported");
1137 return -EINVAL;
1138 }
1139#ifdef CONFIG_TIPC_MEDIA_UDP
1140 if (tipc_udp_mtu_bad(nla_get_u32
1141 (props[TIPC_NLA_PROP_MTU]))) {
1142 NL_SET_ERR_MSG(info->extack,
1143 "MTU value is out-of-range");
1144 return -EINVAL;
1145 }
1146 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1147 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1148#endif
1149 }
1150 }
1151
1152 return 0;
1153}
1154
1155int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1156{
1157 int err;
1158
1159 rtnl_lock();
1160 err = __tipc_nl_bearer_set(skb, info);
1161 rtnl_unlock();
1162
1163 return err;
1164}
1165
1166static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1167 struct tipc_media *media, int nlflags)
1168{
1169 void *hdr;
1170 struct nlattr *attrs;
1171 struct nlattr *prop;
1172
1173 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1174 nlflags, TIPC_NL_MEDIA_GET);
1175 if (!hdr)
1176 return -EMSGSIZE;
1177
1178 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1179 if (!attrs)
1180 goto msg_full;
1181
1182 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1183 goto attr_msg_full;
1184
1185 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1186 if (!prop)
1187 goto prop_msg_full;
1188 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1189 goto prop_msg_full;
1190 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1191 goto prop_msg_full;
1192 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1193 goto prop_msg_full;
1194 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1195 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1196 goto prop_msg_full;
1197
1198 nla_nest_end(msg->skb, prop);
1199 nla_nest_end(msg->skb, attrs);
1200 genlmsg_end(msg->skb, hdr);
1201
1202 return 0;
1203
1204prop_msg_full:
1205 nla_nest_cancel(msg->skb, prop);
1206attr_msg_full:
1207 nla_nest_cancel(msg->skb, attrs);
1208msg_full:
1209 genlmsg_cancel(msg->skb, hdr);
1210
1211 return -EMSGSIZE;
1212}
1213
1214int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1215{
1216 int err;
1217 int i = cb->args[0];
1218 struct tipc_nl_msg msg;
1219
1220 if (i == MAX_MEDIA)
1221 return 0;
1222
1223 msg.skb = skb;
1224 msg.portid = NETLINK_CB(cb->skb).portid;
1225 msg.seq = cb->nlh->nlmsg_seq;
1226
1227 rtnl_lock();
1228 for (; media_info_array[i] != NULL; i++) {
1229 err = __tipc_nl_add_media(&msg, media_info_array[i],
1230 NLM_F_MULTI);
1231 if (err)
1232 break;
1233 }
1234 rtnl_unlock();
1235
1236 cb->args[0] = i;
1237 return skb->len;
1238}
1239
1240int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1241{
1242 int err;
1243 char *name;
1244 struct tipc_nl_msg msg;
1245 struct tipc_media *media;
1246 struct sk_buff *rep;
1247 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1248
1249 if (!info->attrs[TIPC_NLA_MEDIA])
1250 return -EINVAL;
1251
1252 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1253 info->attrs[TIPC_NLA_MEDIA],
1254 tipc_nl_media_policy, info->extack);
1255 if (err)
1256 return err;
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1263 if (!rep)
1264 return -ENOMEM;
1265
1266 msg.skb = rep;
1267 msg.portid = info->snd_portid;
1268 msg.seq = info->snd_seq;
1269
1270 rtnl_lock();
1271 media = tipc_media_find(name);
1272 if (!media) {
1273 NL_SET_ERR_MSG(info->extack, "Media not found");
1274 err = -EINVAL;
1275 goto err_out;
1276 }
1277
1278 err = __tipc_nl_add_media(&msg, media, 0);
1279 if (err)
1280 goto err_out;
1281 rtnl_unlock();
1282
1283 return genlmsg_reply(rep, info);
1284err_out:
1285 rtnl_unlock();
1286 nlmsg_free(rep);
1287
1288 return err;
1289}
1290
1291int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1292{
1293 int err;
1294 char *name;
1295 struct tipc_media *m;
1296 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1297
1298 if (!info->attrs[TIPC_NLA_MEDIA])
1299 return -EINVAL;
1300
1301 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1302 info->attrs[TIPC_NLA_MEDIA],
1303 tipc_nl_media_policy, info->extack);
1304
1305 if (!attrs[TIPC_NLA_MEDIA_NAME])
1306 return -EINVAL;
1307 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1308
1309 m = tipc_media_find(name);
1310 if (!m) {
1311 NL_SET_ERR_MSG(info->extack, "Media not found");
1312 return -EINVAL;
1313 }
1314 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1315 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1316
1317 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1318 props);
1319 if (err)
1320 return err;
1321
1322 if (props[TIPC_NLA_PROP_TOL])
1323 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1324 if (props[TIPC_NLA_PROP_PRIO])
1325 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1326 if (props[TIPC_NLA_PROP_WIN])
1327 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1328 if (props[TIPC_NLA_PROP_MTU]) {
1329 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1330 NL_SET_ERR_MSG(info->extack,
1331 "MTU property is unsupported");
1332 return -EINVAL;
1333 }
1334#ifdef CONFIG_TIPC_MEDIA_UDP
1335 if (tipc_udp_mtu_bad(nla_get_u32
1336 (props[TIPC_NLA_PROP_MTU]))) {
1337 NL_SET_ERR_MSG(info->extack,
1338 "MTU value is out-of-range");
1339 return -EINVAL;
1340 }
1341 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1342#endif
1343 }
1344 }
1345
1346 return 0;
1347}
1348
1349int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1350{
1351 int err;
1352
1353 rtnl_lock();
1354 err = __tipc_nl_media_set(skb, info);
1355 rtnl_unlock();
1356
1357 return err;
1358}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46
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);
68static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
69 struct packet_type *pt, struct net_device *orig_dev);
70
71/**
72 * tipc_media_find - locates specified media object by name
73 */
74struct tipc_media *tipc_media_find(const char *name)
75{
76 u32 i;
77
78 for (i = 0; media_info_array[i] != NULL; i++) {
79 if (!strcmp(media_info_array[i]->name, name))
80 break;
81 }
82 return media_info_array[i];
83}
84
85/**
86 * media_find_id - locates specified media object by type identifier
87 */
88static struct tipc_media *media_find_id(u8 type)
89{
90 u32 i;
91
92 for (i = 0; media_info_array[i] != NULL; i++) {
93 if (media_info_array[i]->type_id == type)
94 break;
95 }
96 return media_info_array[i];
97}
98
99/**
100 * tipc_media_addr_printf - record media address in print buffer
101 */
102void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
103{
104 char addr_str[MAX_ADDR_STR];
105 struct tipc_media *m;
106 int ret;
107
108 m = media_find_id(a->media_id);
109
110 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
111 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
112 else {
113 u32 i;
114
115 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
116 for (i = 0; i < sizeof(a->value); i++)
117 ret += scnprintf(buf - ret, len + ret,
118 "-%02x", a->value[i]);
119 }
120}
121
122/**
123 * bearer_name_validate - validate & (optionally) deconstruct bearer name
124 * @name: ptr to bearer name string
125 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
126 *
127 * Returns 1 if bearer name is valid, otherwise 0.
128 */
129static int bearer_name_validate(const char *name,
130 struct tipc_bearer_names *name_parts)
131{
132 char name_copy[TIPC_MAX_BEARER_NAME];
133 char *media_name;
134 char *if_name;
135 u32 media_len;
136 u32 if_len;
137
138 /* copy bearer name & ensure length is OK */
139 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
140 /* need above in case non-Posix strncpy() doesn't pad with nulls */
141 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
142 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
143 return 0;
144
145 /* ensure all component parts of bearer name are present */
146 media_name = name_copy;
147 if_name = strchr(media_name, ':');
148 if (if_name == NULL)
149 return 0;
150 *(if_name++) = 0;
151 media_len = if_name - media_name;
152 if_len = strlen(if_name) + 1;
153
154 /* validate component parts of bearer name */
155 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
156 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
157 return 0;
158
159 /* return bearer name components, if necessary */
160 if (name_parts) {
161 strcpy(name_parts->media_name, media_name);
162 strcpy(name_parts->if_name, if_name);
163 }
164 return 1;
165}
166
167/**
168 * tipc_bearer_find - locates bearer object with matching bearer name
169 */
170struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
171{
172 struct tipc_net *tn = net_generic(net, tipc_net_id);
173 struct tipc_bearer *b;
174 u32 i;
175
176 for (i = 0; i < MAX_BEARERS; i++) {
177 b = rtnl_dereference(tn->bearer_list[i]);
178 if (b && (!strcmp(b->name, name)))
179 return b;
180 }
181 return NULL;
182}
183
184/* tipc_bearer_get_name - get the bearer name from its id.
185 * @net: network namespace
186 * @name: a pointer to the buffer where the name will be stored.
187 * @bearer_id: the id to get the name from.
188 */
189int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
190{
191 struct tipc_net *tn = tipc_net(net);
192 struct tipc_bearer *b;
193
194 if (bearer_id >= MAX_BEARERS)
195 return -EINVAL;
196
197 b = rtnl_dereference(tn->bearer_list[bearer_id]);
198 if (!b)
199 return -EINVAL;
200
201 strcpy(name, b->name);
202 return 0;
203}
204
205void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
206{
207 struct tipc_net *tn = net_generic(net, tipc_net_id);
208 struct tipc_bearer *b;
209
210 rcu_read_lock();
211 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
212 if (b)
213 tipc_disc_add_dest(b->disc);
214 rcu_read_unlock();
215}
216
217void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
218{
219 struct tipc_net *tn = net_generic(net, tipc_net_id);
220 struct tipc_bearer *b;
221
222 rcu_read_lock();
223 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
224 if (b)
225 tipc_disc_remove_dest(b->disc);
226 rcu_read_unlock();
227}
228
229/**
230 * tipc_enable_bearer - enable bearer with the given name
231 */
232static int tipc_enable_bearer(struct net *net, const char *name,
233 u32 disc_domain, u32 prio,
234 struct nlattr *attr[])
235{
236 struct tipc_net *tn = tipc_net(net);
237 struct tipc_bearer_names b_names;
238 int with_this_prio = 1;
239 struct tipc_bearer *b;
240 struct tipc_media *m;
241 struct sk_buff *skb;
242 int bearer_id = 0;
243 int res = -EINVAL;
244 char *errstr = "";
245
246 if (!bearer_name_validate(name, &b_names)) {
247 errstr = "illegal name";
248 goto rejected;
249 }
250
251 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
252 errstr = "illegal priority";
253 goto rejected;
254 }
255
256 m = tipc_media_find(b_names.media_name);
257 if (!m) {
258 errstr = "media not registered";
259 goto rejected;
260 }
261
262 if (prio == TIPC_MEDIA_LINK_PRI)
263 prio = m->priority;
264
265 /* Check new bearer vs existing ones and find free bearer id if any */
266 while (bearer_id < MAX_BEARERS) {
267 b = rtnl_dereference(tn->bearer_list[bearer_id]);
268 if (!b)
269 break;
270 if (!strcmp(name, b->name)) {
271 errstr = "already enabled";
272 goto rejected;
273 }
274 bearer_id++;
275 if (b->priority != prio)
276 continue;
277 if (++with_this_prio <= 2)
278 continue;
279 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
280 name, prio);
281 if (prio == TIPC_MIN_LINK_PRI) {
282 errstr = "cannot adjust to lower";
283 goto rejected;
284 }
285 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
286 prio--;
287 bearer_id = 0;
288 with_this_prio = 1;
289 }
290
291 if (bearer_id >= MAX_BEARERS) {
292 errstr = "max 3 bearers permitted";
293 goto rejected;
294 }
295
296 b = kzalloc(sizeof(*b), GFP_ATOMIC);
297 if (!b)
298 return -ENOMEM;
299
300 strcpy(b->name, name);
301 b->media = m;
302 res = m->enable_media(net, b, attr);
303 if (res) {
304 kfree(b);
305 errstr = "failed to enable media";
306 goto rejected;
307 }
308
309 b->identity = bearer_id;
310 b->tolerance = m->tolerance;
311 b->window = m->window;
312 b->domain = disc_domain;
313 b->net_plane = bearer_id + 'A';
314 b->priority = prio;
315 test_and_set_bit_lock(0, &b->up);
316
317 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
318 if (res) {
319 bearer_disable(net, b);
320 kfree(b);
321 errstr = "failed to create discoverer";
322 goto rejected;
323 }
324
325 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
326 if (skb)
327 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
328
329 if (tipc_mon_create(net, bearer_id)) {
330 bearer_disable(net, b);
331 return -ENOMEM;
332 }
333
334 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
335
336 return res;
337rejected:
338 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
339 return res;
340}
341
342/**
343 * tipc_reset_bearer - Reset all links established over this bearer
344 */
345static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
346{
347 pr_info("Resetting bearer <%s>\n", b->name);
348 tipc_node_delete_links(net, b->identity);
349 tipc_disc_reset(net, b);
350 return 0;
351}
352
353/**
354 * bearer_disable
355 *
356 * Note: This routine assumes caller holds RTNL lock.
357 */
358static void bearer_disable(struct net *net, struct tipc_bearer *b)
359{
360 struct tipc_net *tn = tipc_net(net);
361 int bearer_id = b->identity;
362
363 pr_info("Disabling bearer <%s>\n", b->name);
364 clear_bit_unlock(0, &b->up);
365 tipc_node_delete_links(net, bearer_id);
366 b->media->disable_media(b);
367 RCU_INIT_POINTER(b->media_ptr, NULL);
368 if (b->disc)
369 tipc_disc_delete(b->disc);
370 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
371 kfree_rcu(b, rcu);
372 tipc_mon_delete(net, bearer_id);
373}
374
375int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
376 struct nlattr *attr[])
377{
378 char *dev_name = strchr((const char *)b->name, ':') + 1;
379 int hwaddr_len = b->media->hwaddr_len;
380 u8 node_id[NODE_ID_LEN] = {0,};
381 struct net_device *dev;
382
383 /* Find device with specified name */
384 dev = dev_get_by_name(net, dev_name);
385 if (!dev)
386 return -ENODEV;
387 if (tipc_mtu_bad(dev, 0)) {
388 dev_put(dev);
389 return -EINVAL;
390 }
391
392 /* Autoconfigure own node identity if needed */
393 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
394 memcpy(node_id, dev->dev_addr, hwaddr_len);
395 tipc_net_init(net, node_id, 0);
396 }
397 if (!tipc_own_id(net)) {
398 pr_warn("Failed to obtain node identity\n");
399 return -EINVAL;
400 }
401
402 /* Associate TIPC bearer with L2 bearer */
403 rcu_assign_pointer(b->media_ptr, dev);
404 b->pt.dev = dev;
405 b->pt.type = htons(ETH_P_TIPC);
406 b->pt.func = tipc_l2_rcv_msg;
407 dev_add_pack(&b->pt);
408 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
409 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
410 b->bcast_addr.media_id = b->media->type_id;
411 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
412 b->mtu = dev->mtu;
413 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
414 rcu_assign_pointer(dev->tipc_ptr, b);
415 return 0;
416}
417
418/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
419 *
420 * Mark L2 bearer as inactive so that incoming buffers are thrown away
421 */
422void tipc_disable_l2_media(struct tipc_bearer *b)
423{
424 struct net_device *dev;
425
426 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
427 dev_remove_pack(&b->pt);
428 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
429 synchronize_net();
430 dev_put(dev);
431}
432
433/**
434 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
435 * @skb: the packet to be sent
436 * @b: the bearer through which the packet is to be sent
437 * @dest: peer destination address
438 */
439int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
440 struct tipc_bearer *b, struct tipc_media_addr *dest)
441{
442 struct net_device *dev;
443 int delta;
444
445 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
446 if (!dev)
447 return 0;
448
449 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
450 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
451 kfree_skb(skb);
452 return 0;
453 }
454 skb_reset_network_header(skb);
455 skb->dev = dev;
456 skb->protocol = htons(ETH_P_TIPC);
457 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
458 dev->dev_addr, skb->len);
459 dev_queue_xmit(skb);
460 return 0;
461}
462
463bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
464{
465 bool supp = false;
466 struct tipc_bearer *b;
467
468 rcu_read_lock();
469 b = bearer_get(net, bearer_id);
470 if (b)
471 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
472 rcu_read_unlock();
473 return supp;
474}
475
476int tipc_bearer_mtu(struct net *net, u32 bearer_id)
477{
478 int mtu = 0;
479 struct tipc_bearer *b;
480
481 rcu_read_lock();
482 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
483 if (b)
484 mtu = b->mtu;
485 rcu_read_unlock();
486 return mtu;
487}
488
489/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
490 */
491void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
492 struct sk_buff *skb,
493 struct tipc_media_addr *dest)
494{
495 struct tipc_msg *hdr = buf_msg(skb);
496 struct tipc_bearer *b;
497
498 rcu_read_lock();
499 b = bearer_get(net, bearer_id);
500 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
501 b->media->send_msg(net, skb, b, dest);
502 else
503 kfree_skb(skb);
504 rcu_read_unlock();
505}
506
507/* tipc_bearer_xmit() -send buffer to destination over bearer
508 */
509void tipc_bearer_xmit(struct net *net, u32 bearer_id,
510 struct sk_buff_head *xmitq,
511 struct tipc_media_addr *dst)
512{
513 struct tipc_bearer *b;
514 struct sk_buff *skb, *tmp;
515
516 if (skb_queue_empty(xmitq))
517 return;
518
519 rcu_read_lock();
520 b = bearer_get(net, bearer_id);
521 if (unlikely(!b))
522 __skb_queue_purge(xmitq);
523 skb_queue_walk_safe(xmitq, skb, tmp) {
524 __skb_dequeue(xmitq);
525 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
526 b->media->send_msg(net, skb, b, dst);
527 else
528 kfree_skb(skb);
529 }
530 rcu_read_unlock();
531}
532
533/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
534 */
535void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
536 struct sk_buff_head *xmitq)
537{
538 struct tipc_net *tn = tipc_net(net);
539 int net_id = tn->net_id;
540 struct tipc_bearer *b;
541 struct sk_buff *skb, *tmp;
542 struct tipc_msg *hdr;
543
544 rcu_read_lock();
545 b = bearer_get(net, bearer_id);
546 if (unlikely(!b || !test_bit(0, &b->up)))
547 __skb_queue_purge(xmitq);
548 skb_queue_walk_safe(xmitq, skb, tmp) {
549 hdr = buf_msg(skb);
550 msg_set_non_seq(hdr, 1);
551 msg_set_mc_netid(hdr, net_id);
552 __skb_dequeue(xmitq);
553 b->media->send_msg(net, skb, b, &b->bcast_addr);
554 }
555 rcu_read_unlock();
556}
557
558/**
559 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
560 * @buf: the received packet
561 * @dev: the net device that the packet was received on
562 * @pt: the packet_type structure which was used to register this handler
563 * @orig_dev: the original receive net device in case the device is a bond
564 *
565 * Accept only packets explicitly sent to this node, or broadcast packets;
566 * ignores packets sent using interface multicast, and traffic sent to other
567 * nodes (which can happen if interface is running in promiscuous mode).
568 */
569static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
570 struct packet_type *pt, struct net_device *orig_dev)
571{
572 struct tipc_bearer *b;
573
574 rcu_read_lock();
575 b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
576 rcu_dereference_rtnl(orig_dev->tipc_ptr);
577 if (likely(b && test_bit(0, &b->up) &&
578 (skb->pkt_type <= PACKET_MULTICAST))) {
579 skb->next = NULL;
580 tipc_rcv(dev_net(b->pt.dev), skb, b);
581 rcu_read_unlock();
582 return NET_RX_SUCCESS;
583 }
584 rcu_read_unlock();
585 kfree_skb(skb);
586 return NET_RX_DROP;
587}
588
589/**
590 * tipc_l2_device_event - handle device events from network device
591 * @nb: the context of the notification
592 * @evt: the type of event
593 * @ptr: the net device that the event was on
594 *
595 * This function is called by the Ethernet driver in case of link
596 * change event.
597 */
598static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
599 void *ptr)
600{
601 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
602 struct net *net = dev_net(dev);
603 struct tipc_bearer *b;
604
605 b = rtnl_dereference(dev->tipc_ptr);
606 if (!b)
607 return NOTIFY_DONE;
608
609 switch (evt) {
610 case NETDEV_CHANGE:
611 if (netif_carrier_ok(dev))
612 break;
613 case NETDEV_UP:
614 test_and_set_bit_lock(0, &b->up);
615 break;
616 case NETDEV_GOING_DOWN:
617 clear_bit_unlock(0, &b->up);
618 tipc_reset_bearer(net, b);
619 break;
620 case NETDEV_CHANGEMTU:
621 if (tipc_mtu_bad(dev, 0)) {
622 bearer_disable(net, b);
623 break;
624 }
625 b->mtu = dev->mtu;
626 tipc_reset_bearer(net, b);
627 break;
628 case NETDEV_CHANGEADDR:
629 b->media->raw2addr(b, &b->addr,
630 (char *)dev->dev_addr);
631 tipc_reset_bearer(net, b);
632 break;
633 case NETDEV_UNREGISTER:
634 case NETDEV_CHANGENAME:
635 bearer_disable(net, b);
636 break;
637 }
638 return NOTIFY_OK;
639}
640
641static struct notifier_block notifier = {
642 .notifier_call = tipc_l2_device_event,
643 .priority = 0,
644};
645
646int tipc_bearer_setup(void)
647{
648 return register_netdevice_notifier(¬ifier);
649}
650
651void tipc_bearer_cleanup(void)
652{
653 unregister_netdevice_notifier(¬ifier);
654}
655
656void tipc_bearer_stop(struct net *net)
657{
658 struct tipc_net *tn = net_generic(net, tipc_net_id);
659 struct tipc_bearer *b;
660 u32 i;
661
662 for (i = 0; i < MAX_BEARERS; i++) {
663 b = rtnl_dereference(tn->bearer_list[i]);
664 if (b) {
665 bearer_disable(net, b);
666 tn->bearer_list[i] = NULL;
667 }
668 }
669}
670
671/* Caller should hold rtnl_lock to protect the bearer */
672static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
673 struct tipc_bearer *bearer, int nlflags)
674{
675 void *hdr;
676 struct nlattr *attrs;
677 struct nlattr *prop;
678
679 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
680 nlflags, TIPC_NL_BEARER_GET);
681 if (!hdr)
682 return -EMSGSIZE;
683
684 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
685 if (!attrs)
686 goto msg_full;
687
688 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
689 goto attr_msg_full;
690
691 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
692 if (!prop)
693 goto prop_msg_full;
694 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
695 goto prop_msg_full;
696 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
697 goto prop_msg_full;
698 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
699 goto prop_msg_full;
700
701 nla_nest_end(msg->skb, prop);
702
703#ifdef CONFIG_TIPC_MEDIA_UDP
704 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
705 if (tipc_udp_nl_add_bearer_data(msg, bearer))
706 goto attr_msg_full;
707 }
708#endif
709
710 nla_nest_end(msg->skb, attrs);
711 genlmsg_end(msg->skb, hdr);
712
713 return 0;
714
715prop_msg_full:
716 nla_nest_cancel(msg->skb, prop);
717attr_msg_full:
718 nla_nest_cancel(msg->skb, attrs);
719msg_full:
720 genlmsg_cancel(msg->skb, hdr);
721
722 return -EMSGSIZE;
723}
724
725int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
726{
727 int err;
728 int i = cb->args[0];
729 struct tipc_bearer *bearer;
730 struct tipc_nl_msg msg;
731 struct net *net = sock_net(skb->sk);
732 struct tipc_net *tn = net_generic(net, tipc_net_id);
733
734 if (i == MAX_BEARERS)
735 return 0;
736
737 msg.skb = skb;
738 msg.portid = NETLINK_CB(cb->skb).portid;
739 msg.seq = cb->nlh->nlmsg_seq;
740
741 rtnl_lock();
742 for (i = 0; i < MAX_BEARERS; i++) {
743 bearer = rtnl_dereference(tn->bearer_list[i]);
744 if (!bearer)
745 continue;
746
747 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
748 if (err)
749 break;
750 }
751 rtnl_unlock();
752
753 cb->args[0] = i;
754 return skb->len;
755}
756
757int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
758{
759 int err;
760 char *name;
761 struct sk_buff *rep;
762 struct tipc_bearer *bearer;
763 struct tipc_nl_msg msg;
764 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
765 struct net *net = genl_info_net(info);
766
767 if (!info->attrs[TIPC_NLA_BEARER])
768 return -EINVAL;
769
770 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
771 info->attrs[TIPC_NLA_BEARER],
772 tipc_nl_bearer_policy, info->extack);
773 if (err)
774 return err;
775
776 if (!attrs[TIPC_NLA_BEARER_NAME])
777 return -EINVAL;
778 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
779
780 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
781 if (!rep)
782 return -ENOMEM;
783
784 msg.skb = rep;
785 msg.portid = info->snd_portid;
786 msg.seq = info->snd_seq;
787
788 rtnl_lock();
789 bearer = tipc_bearer_find(net, name);
790 if (!bearer) {
791 err = -EINVAL;
792 goto err_out;
793 }
794
795 err = __tipc_nl_add_bearer(&msg, bearer, 0);
796 if (err)
797 goto err_out;
798 rtnl_unlock();
799
800 return genlmsg_reply(rep, info);
801err_out:
802 rtnl_unlock();
803 nlmsg_free(rep);
804
805 return err;
806}
807
808int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
809{
810 int err;
811 char *name;
812 struct tipc_bearer *bearer;
813 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
814 struct net *net = sock_net(skb->sk);
815
816 if (!info->attrs[TIPC_NLA_BEARER])
817 return -EINVAL;
818
819 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
820 info->attrs[TIPC_NLA_BEARER],
821 tipc_nl_bearer_policy, info->extack);
822 if (err)
823 return err;
824
825 if (!attrs[TIPC_NLA_BEARER_NAME])
826 return -EINVAL;
827
828 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
829
830 bearer = tipc_bearer_find(net, name);
831 if (!bearer)
832 return -EINVAL;
833
834 bearer_disable(net, bearer);
835
836 return 0;
837}
838
839int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
840{
841 int err;
842
843 rtnl_lock();
844 err = __tipc_nl_bearer_disable(skb, info);
845 rtnl_unlock();
846
847 return err;
848}
849
850int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
851{
852 int err;
853 char *bearer;
854 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
855 struct net *net = sock_net(skb->sk);
856 u32 domain = 0;
857 u32 prio;
858
859 prio = TIPC_MEDIA_LINK_PRI;
860
861 if (!info->attrs[TIPC_NLA_BEARER])
862 return -EINVAL;
863
864 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
865 info->attrs[TIPC_NLA_BEARER],
866 tipc_nl_bearer_policy, info->extack);
867 if (err)
868 return err;
869
870 if (!attrs[TIPC_NLA_BEARER_NAME])
871 return -EINVAL;
872
873 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
874
875 if (attrs[TIPC_NLA_BEARER_DOMAIN])
876 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
877
878 if (attrs[TIPC_NLA_BEARER_PROP]) {
879 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
880
881 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
882 props);
883 if (err)
884 return err;
885
886 if (props[TIPC_NLA_PROP_PRIO])
887 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
888 }
889
890 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
891}
892
893int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
894{
895 int err;
896
897 rtnl_lock();
898 err = __tipc_nl_bearer_enable(skb, info);
899 rtnl_unlock();
900
901 return err;
902}
903
904int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
905{
906 int err;
907 char *name;
908 struct tipc_bearer *b;
909 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
910 struct net *net = sock_net(skb->sk);
911
912 if (!info->attrs[TIPC_NLA_BEARER])
913 return -EINVAL;
914
915 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
916 info->attrs[TIPC_NLA_BEARER],
917 tipc_nl_bearer_policy, info->extack);
918 if (err)
919 return err;
920
921 if (!attrs[TIPC_NLA_BEARER_NAME])
922 return -EINVAL;
923 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
924
925 rtnl_lock();
926 b = tipc_bearer_find(net, name);
927 if (!b) {
928 rtnl_unlock();
929 return -EINVAL;
930 }
931
932#ifdef CONFIG_TIPC_MEDIA_UDP
933 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
934 err = tipc_udp_nl_bearer_add(b,
935 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
936 if (err) {
937 rtnl_unlock();
938 return err;
939 }
940 }
941#endif
942 rtnl_unlock();
943
944 return 0;
945}
946
947int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
948{
949 struct tipc_bearer *b;
950 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
951 struct net *net = sock_net(skb->sk);
952 char *name;
953 int err;
954
955 if (!info->attrs[TIPC_NLA_BEARER])
956 return -EINVAL;
957
958 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
959 info->attrs[TIPC_NLA_BEARER],
960 tipc_nl_bearer_policy, info->extack);
961 if (err)
962 return err;
963
964 if (!attrs[TIPC_NLA_BEARER_NAME])
965 return -EINVAL;
966 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
967
968 b = tipc_bearer_find(net, name);
969 if (!b)
970 return -EINVAL;
971
972 if (attrs[TIPC_NLA_BEARER_PROP]) {
973 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
974
975 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
976 props);
977 if (err)
978 return err;
979
980 if (props[TIPC_NLA_PROP_TOL]) {
981 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
982 tipc_node_apply_tolerance(net, b);
983 }
984 if (props[TIPC_NLA_PROP_PRIO])
985 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
986 if (props[TIPC_NLA_PROP_WIN])
987 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
988 }
989
990 return 0;
991}
992
993int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
994{
995 int err;
996
997 rtnl_lock();
998 err = __tipc_nl_bearer_set(skb, info);
999 rtnl_unlock();
1000
1001 return err;
1002}
1003
1004static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1005 struct tipc_media *media, int nlflags)
1006{
1007 void *hdr;
1008 struct nlattr *attrs;
1009 struct nlattr *prop;
1010
1011 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1012 nlflags, TIPC_NL_MEDIA_GET);
1013 if (!hdr)
1014 return -EMSGSIZE;
1015
1016 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1017 if (!attrs)
1018 goto msg_full;
1019
1020 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1021 goto attr_msg_full;
1022
1023 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1024 if (!prop)
1025 goto prop_msg_full;
1026 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1027 goto prop_msg_full;
1028 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1029 goto prop_msg_full;
1030 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1031 goto prop_msg_full;
1032
1033 nla_nest_end(msg->skb, prop);
1034 nla_nest_end(msg->skb, attrs);
1035 genlmsg_end(msg->skb, hdr);
1036
1037 return 0;
1038
1039prop_msg_full:
1040 nla_nest_cancel(msg->skb, prop);
1041attr_msg_full:
1042 nla_nest_cancel(msg->skb, attrs);
1043msg_full:
1044 genlmsg_cancel(msg->skb, hdr);
1045
1046 return -EMSGSIZE;
1047}
1048
1049int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1050{
1051 int err;
1052 int i = cb->args[0];
1053 struct tipc_nl_msg msg;
1054
1055 if (i == MAX_MEDIA)
1056 return 0;
1057
1058 msg.skb = skb;
1059 msg.portid = NETLINK_CB(cb->skb).portid;
1060 msg.seq = cb->nlh->nlmsg_seq;
1061
1062 rtnl_lock();
1063 for (; media_info_array[i] != NULL; i++) {
1064 err = __tipc_nl_add_media(&msg, media_info_array[i],
1065 NLM_F_MULTI);
1066 if (err)
1067 break;
1068 }
1069 rtnl_unlock();
1070
1071 cb->args[0] = i;
1072 return skb->len;
1073}
1074
1075int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1076{
1077 int err;
1078 char *name;
1079 struct tipc_nl_msg msg;
1080 struct tipc_media *media;
1081 struct sk_buff *rep;
1082 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1083
1084 if (!info->attrs[TIPC_NLA_MEDIA])
1085 return -EINVAL;
1086
1087 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1088 info->attrs[TIPC_NLA_MEDIA],
1089 tipc_nl_media_policy, info->extack);
1090 if (err)
1091 return err;
1092
1093 if (!attrs[TIPC_NLA_MEDIA_NAME])
1094 return -EINVAL;
1095 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1096
1097 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1098 if (!rep)
1099 return -ENOMEM;
1100
1101 msg.skb = rep;
1102 msg.portid = info->snd_portid;
1103 msg.seq = info->snd_seq;
1104
1105 rtnl_lock();
1106 media = tipc_media_find(name);
1107 if (!media) {
1108 err = -EINVAL;
1109 goto err_out;
1110 }
1111
1112 err = __tipc_nl_add_media(&msg, media, 0);
1113 if (err)
1114 goto err_out;
1115 rtnl_unlock();
1116
1117 return genlmsg_reply(rep, info);
1118err_out:
1119 rtnl_unlock();
1120 nlmsg_free(rep);
1121
1122 return err;
1123}
1124
1125int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1126{
1127 int err;
1128 char *name;
1129 struct tipc_media *m;
1130 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1131
1132 if (!info->attrs[TIPC_NLA_MEDIA])
1133 return -EINVAL;
1134
1135 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1136 info->attrs[TIPC_NLA_MEDIA],
1137 tipc_nl_media_policy, info->extack);
1138
1139 if (!attrs[TIPC_NLA_MEDIA_NAME])
1140 return -EINVAL;
1141 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1142
1143 m = tipc_media_find(name);
1144 if (!m)
1145 return -EINVAL;
1146
1147 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1148 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1149
1150 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1151 props);
1152 if (err)
1153 return err;
1154
1155 if (props[TIPC_NLA_PROP_TOL])
1156 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1157 if (props[TIPC_NLA_PROP_PRIO])
1158 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1159 if (props[TIPC_NLA_PROP_WIN])
1160 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1161 }
1162
1163 return 0;
1164}
1165
1166int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1167{
1168 int err;
1169
1170 rtnl_lock();
1171 err = __tipc_nl_media_set(skb, info);
1172 rtnl_unlock();
1173
1174 return err;
1175}