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1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 */
76struct tipc_media *tipc_media_find(const char *name)
77{
78 u32 i;
79
80 for (i = 0; media_info_array[i] != NULL; i++) {
81 if (!strcmp(media_info_array[i]->name, name))
82 break;
83 }
84 return media_info_array[i];
85}
86
87/**
88 * media_find_id - locates specified media object by type identifier
89 */
90static struct tipc_media *media_find_id(u8 type)
91{
92 u32 i;
93
94 for (i = 0; media_info_array[i] != NULL; i++) {
95 if (media_info_array[i]->type_id == type)
96 break;
97 }
98 return media_info_array[i];
99}
100
101/**
102 * tipc_media_addr_printf - record media address in print buffer
103 */
104int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
105{
106 char addr_str[MAX_ADDR_STR];
107 struct tipc_media *m;
108 int ret;
109
110 m = media_find_id(a->media_id);
111
112 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
113 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
114 else {
115 u32 i;
116
117 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
118 for (i = 0; i < sizeof(a->value); i++)
119 ret += scnprintf(buf + ret, len - ret,
120 "-%x", a->value[i]);
121 }
122 return ret;
123}
124
125/**
126 * bearer_name_validate - validate & (optionally) deconstruct bearer name
127 * @name: ptr to bearer name string
128 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
129 *
130 * Returns 1 if bearer name is valid, otherwise 0.
131 */
132static int bearer_name_validate(const char *name,
133 struct tipc_bearer_names *name_parts)
134{
135 char name_copy[TIPC_MAX_BEARER_NAME];
136 char *media_name;
137 char *if_name;
138 u32 media_len;
139 u32 if_len;
140
141 /* copy bearer name & ensure length is OK */
142 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
143 /* need above in case non-Posix strncpy() doesn't pad with nulls */
144 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
145 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
146 return 0;
147
148 /* ensure all component parts of bearer name are present */
149 media_name = name_copy;
150 if_name = strchr(media_name, ':');
151 if (if_name == NULL)
152 return 0;
153 *(if_name++) = 0;
154 media_len = if_name - media_name;
155 if_len = strlen(if_name) + 1;
156
157 /* validate component parts of bearer name */
158 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
159 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
160 return 0;
161
162 /* return bearer name components, if necessary */
163 if (name_parts) {
164 strcpy(name_parts->media_name, media_name);
165 strcpy(name_parts->if_name, if_name);
166 }
167 return 1;
168}
169
170/**
171 * tipc_bearer_find - locates bearer object with matching bearer name
172 */
173struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b;
177 u32 i;
178
179 for (i = 0; i < MAX_BEARERS; i++) {
180 b = rtnl_dereference(tn->bearer_list[i]);
181 if (b && (!strcmp(b->name, name)))
182 return b;
183 }
184 return NULL;
185}
186
187/* tipc_bearer_get_name - get the bearer name from its id.
188 * @net: network namespace
189 * @name: a pointer to the buffer where the name will be stored.
190 * @bearer_id: the id to get the name from.
191 */
192int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
193{
194 struct tipc_net *tn = tipc_net(net);
195 struct tipc_bearer *b;
196
197 if (bearer_id >= MAX_BEARERS)
198 return -EINVAL;
199
200 b = rtnl_dereference(tn->bearer_list[bearer_id]);
201 if (!b)
202 return -EINVAL;
203
204 strcpy(name, b->name);
205 return 0;
206}
207
208void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
209{
210 struct tipc_net *tn = net_generic(net, tipc_net_id);
211 struct tipc_bearer *b;
212
213 rcu_read_lock();
214 b = rcu_dereference(tn->bearer_list[bearer_id]);
215 if (b)
216 tipc_disc_add_dest(b->disc);
217 rcu_read_unlock();
218}
219
220void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
221{
222 struct tipc_net *tn = net_generic(net, tipc_net_id);
223 struct tipc_bearer *b;
224
225 rcu_read_lock();
226 b = rcu_dereference(tn->bearer_list[bearer_id]);
227 if (b)
228 tipc_disc_remove_dest(b->disc);
229 rcu_read_unlock();
230}
231
232/**
233 * tipc_enable_bearer - enable bearer with the given name
234 */
235static int tipc_enable_bearer(struct net *net, const char *name,
236 u32 disc_domain, u32 prio,
237 struct nlattr *attr[])
238{
239 struct tipc_net *tn = tipc_net(net);
240 struct tipc_bearer_names b_names;
241 int with_this_prio = 1;
242 struct tipc_bearer *b;
243 struct tipc_media *m;
244 struct sk_buff *skb;
245 int bearer_id = 0;
246 int res = -EINVAL;
247 char *errstr = "";
248
249 if (!bearer_name_validate(name, &b_names)) {
250 errstr = "illegal name";
251 goto rejected;
252 }
253
254 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
255 errstr = "illegal priority";
256 goto rejected;
257 }
258
259 m = tipc_media_find(b_names.media_name);
260 if (!m) {
261 errstr = "media not registered";
262 goto rejected;
263 }
264
265 if (prio == TIPC_MEDIA_LINK_PRI)
266 prio = m->priority;
267
268 /* Check new bearer vs existing ones and find free bearer id if any */
269 while (bearer_id < MAX_BEARERS) {
270 b = rtnl_dereference(tn->bearer_list[bearer_id]);
271 if (!b)
272 break;
273 if (!strcmp(name, b->name)) {
274 errstr = "already enabled";
275 goto rejected;
276 }
277 bearer_id++;
278 if (b->priority != prio)
279 continue;
280 if (++with_this_prio <= 2)
281 continue;
282 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
283 name, prio);
284 if (prio == TIPC_MIN_LINK_PRI) {
285 errstr = "cannot adjust to lower";
286 goto rejected;
287 }
288 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
289 prio--;
290 bearer_id = 0;
291 with_this_prio = 1;
292 }
293
294 if (bearer_id >= MAX_BEARERS) {
295 errstr = "max 3 bearers permitted";
296 goto rejected;
297 }
298
299 b = kzalloc(sizeof(*b), GFP_ATOMIC);
300 if (!b)
301 return -ENOMEM;
302
303 strcpy(b->name, name);
304 b->media = m;
305 res = m->enable_media(net, b, attr);
306 if (res) {
307 kfree(b);
308 errstr = "failed to enable media";
309 goto rejected;
310 }
311
312 b->identity = bearer_id;
313 b->tolerance = m->tolerance;
314 b->min_win = m->min_win;
315 b->max_win = m->max_win;
316 b->domain = disc_domain;
317 b->net_plane = bearer_id + 'A';
318 b->priority = prio;
319 refcount_set(&b->refcnt, 1);
320
321 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
322 if (res) {
323 bearer_disable(net, b);
324 errstr = "failed to create discoverer";
325 goto rejected;
326 }
327
328 test_and_set_bit_lock(0, &b->up);
329 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
330 if (skb)
331 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
332
333 if (tipc_mon_create(net, bearer_id)) {
334 bearer_disable(net, b);
335 return -ENOMEM;
336 }
337
338 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
339
340 return res;
341rejected:
342 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
343 return res;
344}
345
346/**
347 * tipc_reset_bearer - Reset all links established over this bearer
348 */
349static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
350{
351 pr_info("Resetting bearer <%s>\n", b->name);
352 tipc_node_delete_links(net, b->identity);
353 tipc_disc_reset(net, b);
354 return 0;
355}
356
357bool tipc_bearer_hold(struct tipc_bearer *b)
358{
359 return (b && refcount_inc_not_zero(&b->refcnt));
360}
361
362void tipc_bearer_put(struct tipc_bearer *b)
363{
364 if (b && refcount_dec_and_test(&b->refcnt))
365 kfree_rcu(b, rcu);
366}
367
368/**
369 * bearer_disable
370 *
371 * Note: This routine assumes caller holds RTNL lock.
372 */
373static void bearer_disable(struct net *net, struct tipc_bearer *b)
374{
375 struct tipc_net *tn = tipc_net(net);
376 int bearer_id = b->identity;
377
378 pr_info("Disabling bearer <%s>\n", b->name);
379 clear_bit_unlock(0, &b->up);
380 tipc_node_delete_links(net, bearer_id);
381 b->media->disable_media(b);
382 RCU_INIT_POINTER(b->media_ptr, NULL);
383 if (b->disc)
384 tipc_disc_delete(b->disc);
385 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
386 tipc_bearer_put(b);
387 tipc_mon_delete(net, bearer_id);
388}
389
390int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
391 struct nlattr *attr[])
392{
393 char *dev_name = strchr((const char *)b->name, ':') + 1;
394 int hwaddr_len = b->media->hwaddr_len;
395 u8 node_id[NODE_ID_LEN] = {0,};
396 struct net_device *dev;
397
398 /* Find device with specified name */
399 dev = dev_get_by_name(net, dev_name);
400 if (!dev)
401 return -ENODEV;
402 if (tipc_mtu_bad(dev, 0)) {
403 dev_put(dev);
404 return -EINVAL;
405 }
406 if (dev == net->loopback_dev) {
407 dev_put(dev);
408 pr_info("Enabling <%s> not permitted\n", b->name);
409 return -EINVAL;
410 }
411
412 /* Autoconfigure own node identity if needed */
413 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
414 memcpy(node_id, dev->dev_addr, hwaddr_len);
415 tipc_net_init(net, node_id, 0);
416 }
417 if (!tipc_own_id(net)) {
418 dev_put(dev);
419 pr_warn("Failed to obtain node identity\n");
420 return -EINVAL;
421 }
422
423 /* Associate TIPC bearer with L2 bearer */
424 rcu_assign_pointer(b->media_ptr, dev);
425 b->pt.dev = dev;
426 b->pt.type = htons(ETH_P_TIPC);
427 b->pt.func = tipc_l2_rcv_msg;
428 dev_add_pack(&b->pt);
429 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
430 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
431 b->bcast_addr.media_id = b->media->type_id;
432 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
433 b->mtu = dev->mtu;
434 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
435 rcu_assign_pointer(dev->tipc_ptr, b);
436 return 0;
437}
438
439/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
440 *
441 * Mark L2 bearer as inactive so that incoming buffers are thrown away
442 */
443void tipc_disable_l2_media(struct tipc_bearer *b)
444{
445 struct net_device *dev;
446
447 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
448 dev_remove_pack(&b->pt);
449 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
450 synchronize_net();
451 dev_put(dev);
452}
453
454/**
455 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
456 * @skb: the packet to be sent
457 * @b: the bearer through which the packet is to be sent
458 * @dest: peer destination address
459 */
460int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
461 struct tipc_bearer *b, struct tipc_media_addr *dest)
462{
463 struct net_device *dev;
464 int delta;
465
466 dev = (struct net_device *)rcu_dereference(b->media_ptr);
467 if (!dev)
468 return 0;
469
470 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
471 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
472 kfree_skb(skb);
473 return 0;
474 }
475 skb_reset_network_header(skb);
476 skb->dev = dev;
477 skb->protocol = htons(ETH_P_TIPC);
478 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
479 dev->dev_addr, skb->len);
480 dev_queue_xmit(skb);
481 return 0;
482}
483
484bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
485{
486 bool supp = false;
487 struct tipc_bearer *b;
488
489 rcu_read_lock();
490 b = bearer_get(net, bearer_id);
491 if (b)
492 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
493 rcu_read_unlock();
494 return supp;
495}
496
497int tipc_bearer_mtu(struct net *net, u32 bearer_id)
498{
499 int mtu = 0;
500 struct tipc_bearer *b;
501
502 rcu_read_lock();
503 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
504 if (b)
505 mtu = b->mtu;
506 rcu_read_unlock();
507 return mtu;
508}
509
510/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
511 */
512void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
513 struct sk_buff *skb,
514 struct tipc_media_addr *dest)
515{
516 struct tipc_msg *hdr = buf_msg(skb);
517 struct tipc_bearer *b;
518
519 rcu_read_lock();
520 b = bearer_get(net, bearer_id);
521 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
522#ifdef CONFIG_TIPC_CRYPTO
523 tipc_crypto_xmit(net, &skb, b, dest, NULL);
524 if (skb)
525#endif
526 b->media->send_msg(net, skb, b, dest);
527 } else {
528 kfree_skb(skb);
529 }
530 rcu_read_unlock();
531}
532
533/* tipc_bearer_xmit() -send buffer to destination over bearer
534 */
535void tipc_bearer_xmit(struct net *net, u32 bearer_id,
536 struct sk_buff_head *xmitq,
537 struct tipc_media_addr *dst,
538 struct tipc_node *__dnode)
539{
540 struct tipc_bearer *b;
541 struct sk_buff *skb, *tmp;
542
543 if (skb_queue_empty(xmitq))
544 return;
545
546 rcu_read_lock();
547 b = bearer_get(net, bearer_id);
548 if (unlikely(!b))
549 __skb_queue_purge(xmitq);
550 skb_queue_walk_safe(xmitq, skb, tmp) {
551 __skb_dequeue(xmitq);
552 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
553#ifdef CONFIG_TIPC_CRYPTO
554 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
555 if (skb)
556#endif
557 b->media->send_msg(net, skb, b, dst);
558 } else {
559 kfree_skb(skb);
560 }
561 }
562 rcu_read_unlock();
563}
564
565/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
566 */
567void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
568 struct sk_buff_head *xmitq)
569{
570 struct tipc_net *tn = tipc_net(net);
571 struct tipc_media_addr *dst;
572 int net_id = tn->net_id;
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575 struct tipc_msg *hdr;
576
577 rcu_read_lock();
578 b = bearer_get(net, bearer_id);
579 if (unlikely(!b || !test_bit(0, &b->up)))
580 __skb_queue_purge(xmitq);
581 skb_queue_walk_safe(xmitq, skb, tmp) {
582 hdr = buf_msg(skb);
583 msg_set_non_seq(hdr, 1);
584 msg_set_mc_netid(hdr, net_id);
585 __skb_dequeue(xmitq);
586 dst = &b->bcast_addr;
587#ifdef CONFIG_TIPC_CRYPTO
588 tipc_crypto_xmit(net, &skb, b, dst, NULL);
589 if (skb)
590#endif
591 b->media->send_msg(net, skb, b, dst);
592 }
593 rcu_read_unlock();
594}
595
596/**
597 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
598 * @skb: the received message
599 * @dev: the net device that the packet was received on
600 * @pt: the packet_type structure which was used to register this handler
601 * @orig_dev: the original receive net device in case the device is a bond
602 *
603 * Accept only packets explicitly sent to this node, or broadcast packets;
604 * ignores packets sent using interface multicast, and traffic sent to other
605 * nodes (which can happen if interface is running in promiscuous mode).
606 */
607static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
608 struct packet_type *pt, struct net_device *orig_dev)
609{
610 struct tipc_bearer *b;
611
612 rcu_read_lock();
613 b = rcu_dereference(dev->tipc_ptr) ?:
614 rcu_dereference(orig_dev->tipc_ptr);
615 if (likely(b && test_bit(0, &b->up) &&
616 (skb->pkt_type <= PACKET_MULTICAST))) {
617 skb_mark_not_on_list(skb);
618 TIPC_SKB_CB(skb)->flags = 0;
619 tipc_rcv(dev_net(b->pt.dev), skb, b);
620 rcu_read_unlock();
621 return NET_RX_SUCCESS;
622 }
623 rcu_read_unlock();
624 kfree_skb(skb);
625 return NET_RX_DROP;
626}
627
628/**
629 * tipc_l2_device_event - handle device events from network device
630 * @nb: the context of the notification
631 * @evt: the type of event
632 * @ptr: the net device that the event was on
633 *
634 * This function is called by the Ethernet driver in case of link
635 * change event.
636 */
637static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
638 void *ptr)
639{
640 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
641 struct net *net = dev_net(dev);
642 struct tipc_bearer *b;
643
644 b = rtnl_dereference(dev->tipc_ptr);
645 if (!b)
646 return NOTIFY_DONE;
647
648 trace_tipc_l2_device_event(dev, b, evt);
649 switch (evt) {
650 case NETDEV_CHANGE:
651 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
652 test_and_set_bit_lock(0, &b->up);
653 break;
654 }
655 fallthrough;
656 case NETDEV_GOING_DOWN:
657 clear_bit_unlock(0, &b->up);
658 tipc_reset_bearer(net, b);
659 break;
660 case NETDEV_UP:
661 test_and_set_bit_lock(0, &b->up);
662 break;
663 case NETDEV_CHANGEMTU:
664 if (tipc_mtu_bad(dev, 0)) {
665 bearer_disable(net, b);
666 break;
667 }
668 b->mtu = dev->mtu;
669 tipc_reset_bearer(net, b);
670 break;
671 case NETDEV_CHANGEADDR:
672 b->media->raw2addr(b, &b->addr,
673 (char *)dev->dev_addr);
674 tipc_reset_bearer(net, b);
675 break;
676 case NETDEV_UNREGISTER:
677 case NETDEV_CHANGENAME:
678 bearer_disable(net, b);
679 break;
680 }
681 return NOTIFY_OK;
682}
683
684static struct notifier_block notifier = {
685 .notifier_call = tipc_l2_device_event,
686 .priority = 0,
687};
688
689int tipc_bearer_setup(void)
690{
691 return register_netdevice_notifier(¬ifier);
692}
693
694void tipc_bearer_cleanup(void)
695{
696 unregister_netdevice_notifier(¬ifier);
697}
698
699void tipc_bearer_stop(struct net *net)
700{
701 struct tipc_net *tn = net_generic(net, tipc_net_id);
702 struct tipc_bearer *b;
703 u32 i;
704
705 for (i = 0; i < MAX_BEARERS; i++) {
706 b = rtnl_dereference(tn->bearer_list[i]);
707 if (b) {
708 bearer_disable(net, b);
709 tn->bearer_list[i] = NULL;
710 }
711 }
712}
713
714void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
715{
716 struct net_device *dev = net->loopback_dev;
717 struct sk_buff *skb, *_skb;
718 int exp;
719
720 skb_queue_walk(pkts, _skb) {
721 skb = pskb_copy(_skb, GFP_ATOMIC);
722 if (!skb)
723 continue;
724
725 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
726 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
727 kfree_skb(skb);
728 continue;
729 }
730
731 skb_reset_network_header(skb);
732 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
733 dev->dev_addr, skb->len);
734 skb->dev = dev;
735 skb->pkt_type = PACKET_HOST;
736 skb->ip_summed = CHECKSUM_UNNECESSARY;
737 skb->protocol = eth_type_trans(skb, dev);
738 netif_rx_ni(skb);
739 }
740}
741
742static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
743 struct packet_type *pt, struct net_device *od)
744{
745 consume_skb(skb);
746 return NET_RX_SUCCESS;
747}
748
749int tipc_attach_loopback(struct net *net)
750{
751 struct net_device *dev = net->loopback_dev;
752 struct tipc_net *tn = tipc_net(net);
753
754 if (!dev)
755 return -ENODEV;
756
757 dev_hold(dev);
758 tn->loopback_pt.dev = dev;
759 tn->loopback_pt.type = htons(ETH_P_TIPC);
760 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
761 dev_add_pack(&tn->loopback_pt);
762 return 0;
763}
764
765void tipc_detach_loopback(struct net *net)
766{
767 struct tipc_net *tn = tipc_net(net);
768
769 dev_remove_pack(&tn->loopback_pt);
770 dev_put(net->loopback_dev);
771}
772
773/* Caller should hold rtnl_lock to protect the bearer */
774static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
775 struct tipc_bearer *bearer, int nlflags)
776{
777 void *hdr;
778 struct nlattr *attrs;
779 struct nlattr *prop;
780
781 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
782 nlflags, TIPC_NL_BEARER_GET);
783 if (!hdr)
784 return -EMSGSIZE;
785
786 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
787 if (!attrs)
788 goto msg_full;
789
790 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
791 goto attr_msg_full;
792
793 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
794 if (!prop)
795 goto prop_msg_full;
796 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
797 goto prop_msg_full;
798 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
799 goto prop_msg_full;
800 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
801 goto prop_msg_full;
802 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
803 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
804 goto prop_msg_full;
805
806 nla_nest_end(msg->skb, prop);
807
808#ifdef CONFIG_TIPC_MEDIA_UDP
809 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
810 if (tipc_udp_nl_add_bearer_data(msg, bearer))
811 goto attr_msg_full;
812 }
813#endif
814
815 nla_nest_end(msg->skb, attrs);
816 genlmsg_end(msg->skb, hdr);
817
818 return 0;
819
820prop_msg_full:
821 nla_nest_cancel(msg->skb, prop);
822attr_msg_full:
823 nla_nest_cancel(msg->skb, attrs);
824msg_full:
825 genlmsg_cancel(msg->skb, hdr);
826
827 return -EMSGSIZE;
828}
829
830int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
831{
832 int err;
833 int i = cb->args[0];
834 struct tipc_bearer *bearer;
835 struct tipc_nl_msg msg;
836 struct net *net = sock_net(skb->sk);
837 struct tipc_net *tn = net_generic(net, tipc_net_id);
838
839 if (i == MAX_BEARERS)
840 return 0;
841
842 msg.skb = skb;
843 msg.portid = NETLINK_CB(cb->skb).portid;
844 msg.seq = cb->nlh->nlmsg_seq;
845
846 rtnl_lock();
847 for (i = 0; i < MAX_BEARERS; i++) {
848 bearer = rtnl_dereference(tn->bearer_list[i]);
849 if (!bearer)
850 continue;
851
852 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
853 if (err)
854 break;
855 }
856 rtnl_unlock();
857
858 cb->args[0] = i;
859 return skb->len;
860}
861
862int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
863{
864 int err;
865 char *name;
866 struct sk_buff *rep;
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
870 struct net *net = genl_info_net(info);
871
872 if (!info->attrs[TIPC_NLA_BEARER])
873 return -EINVAL;
874
875 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
876 info->attrs[TIPC_NLA_BEARER],
877 tipc_nl_bearer_policy, info->extack);
878 if (err)
879 return err;
880
881 if (!attrs[TIPC_NLA_BEARER_NAME])
882 return -EINVAL;
883 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
884
885 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
886 if (!rep)
887 return -ENOMEM;
888
889 msg.skb = rep;
890 msg.portid = info->snd_portid;
891 msg.seq = info->snd_seq;
892
893 rtnl_lock();
894 bearer = tipc_bearer_find(net, name);
895 if (!bearer) {
896 err = -EINVAL;
897 goto err_out;
898 }
899
900 err = __tipc_nl_add_bearer(&msg, bearer, 0);
901 if (err)
902 goto err_out;
903 rtnl_unlock();
904
905 return genlmsg_reply(rep, info);
906err_out:
907 rtnl_unlock();
908 nlmsg_free(rep);
909
910 return err;
911}
912
913int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
914{
915 int err;
916 char *name;
917 struct tipc_bearer *bearer;
918 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
919 struct net *net = sock_net(skb->sk);
920
921 if (!info->attrs[TIPC_NLA_BEARER])
922 return -EINVAL;
923
924 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
925 info->attrs[TIPC_NLA_BEARER],
926 tipc_nl_bearer_policy, info->extack);
927 if (err)
928 return err;
929
930 if (!attrs[TIPC_NLA_BEARER_NAME])
931 return -EINVAL;
932
933 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
934
935 bearer = tipc_bearer_find(net, name);
936 if (!bearer)
937 return -EINVAL;
938
939 bearer_disable(net, bearer);
940
941 return 0;
942}
943
944int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
945{
946 int err;
947
948 rtnl_lock();
949 err = __tipc_nl_bearer_disable(skb, info);
950 rtnl_unlock();
951
952 return err;
953}
954
955int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
956{
957 int err;
958 char *bearer;
959 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
960 struct net *net = sock_net(skb->sk);
961 u32 domain = 0;
962 u32 prio;
963
964 prio = TIPC_MEDIA_LINK_PRI;
965
966 if (!info->attrs[TIPC_NLA_BEARER])
967 return -EINVAL;
968
969 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
970 info->attrs[TIPC_NLA_BEARER],
971 tipc_nl_bearer_policy, info->extack);
972 if (err)
973 return err;
974
975 if (!attrs[TIPC_NLA_BEARER_NAME])
976 return -EINVAL;
977
978 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
979
980 if (attrs[TIPC_NLA_BEARER_DOMAIN])
981 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
982
983 if (attrs[TIPC_NLA_BEARER_PROP]) {
984 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
985
986 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
987 props);
988 if (err)
989 return err;
990
991 if (props[TIPC_NLA_PROP_PRIO])
992 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
993 }
994
995 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
996}
997
998int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
999{
1000 int err;
1001
1002 rtnl_lock();
1003 err = __tipc_nl_bearer_enable(skb, info);
1004 rtnl_unlock();
1005
1006 return err;
1007}
1008
1009int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1010{
1011 int err;
1012 char *name;
1013 struct tipc_bearer *b;
1014 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1015 struct net *net = sock_net(skb->sk);
1016
1017 if (!info->attrs[TIPC_NLA_BEARER])
1018 return -EINVAL;
1019
1020 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1021 info->attrs[TIPC_NLA_BEARER],
1022 tipc_nl_bearer_policy, info->extack);
1023 if (err)
1024 return err;
1025
1026 if (!attrs[TIPC_NLA_BEARER_NAME])
1027 return -EINVAL;
1028 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1029
1030 rtnl_lock();
1031 b = tipc_bearer_find(net, name);
1032 if (!b) {
1033 rtnl_unlock();
1034 return -EINVAL;
1035 }
1036
1037#ifdef CONFIG_TIPC_MEDIA_UDP
1038 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1039 err = tipc_udp_nl_bearer_add(b,
1040 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1041 if (err) {
1042 rtnl_unlock();
1043 return err;
1044 }
1045 }
1046#endif
1047 rtnl_unlock();
1048
1049 return 0;
1050}
1051
1052int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1053{
1054 struct tipc_bearer *b;
1055 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1056 struct net *net = sock_net(skb->sk);
1057 char *name;
1058 int err;
1059
1060 if (!info->attrs[TIPC_NLA_BEARER])
1061 return -EINVAL;
1062
1063 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1064 info->attrs[TIPC_NLA_BEARER],
1065 tipc_nl_bearer_policy, info->extack);
1066 if (err)
1067 return err;
1068
1069 if (!attrs[TIPC_NLA_BEARER_NAME])
1070 return -EINVAL;
1071 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1072
1073 b = tipc_bearer_find(net, name);
1074 if (!b)
1075 return -EINVAL;
1076
1077 if (attrs[TIPC_NLA_BEARER_PROP]) {
1078 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1079
1080 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1081 props);
1082 if (err)
1083 return err;
1084
1085 if (props[TIPC_NLA_PROP_TOL]) {
1086 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1087 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1088 }
1089 if (props[TIPC_NLA_PROP_PRIO])
1090 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1091 if (props[TIPC_NLA_PROP_WIN])
1092 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1093 if (props[TIPC_NLA_PROP_MTU]) {
1094 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1095 return -EINVAL;
1096#ifdef CONFIG_TIPC_MEDIA_UDP
1097 if (tipc_udp_mtu_bad(nla_get_u32
1098 (props[TIPC_NLA_PROP_MTU])))
1099 return -EINVAL;
1100 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1101 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1102#endif
1103 }
1104 }
1105
1106 return 0;
1107}
1108
1109int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1110{
1111 int err;
1112
1113 rtnl_lock();
1114 err = __tipc_nl_bearer_set(skb, info);
1115 rtnl_unlock();
1116
1117 return err;
1118}
1119
1120static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1121 struct tipc_media *media, int nlflags)
1122{
1123 void *hdr;
1124 struct nlattr *attrs;
1125 struct nlattr *prop;
1126
1127 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1128 nlflags, TIPC_NL_MEDIA_GET);
1129 if (!hdr)
1130 return -EMSGSIZE;
1131
1132 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1133 if (!attrs)
1134 goto msg_full;
1135
1136 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1137 goto attr_msg_full;
1138
1139 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1140 if (!prop)
1141 goto prop_msg_full;
1142 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1143 goto prop_msg_full;
1144 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1145 goto prop_msg_full;
1146 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1147 goto prop_msg_full;
1148 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1149 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1150 goto prop_msg_full;
1151
1152 nla_nest_end(msg->skb, prop);
1153 nla_nest_end(msg->skb, attrs);
1154 genlmsg_end(msg->skb, hdr);
1155
1156 return 0;
1157
1158prop_msg_full:
1159 nla_nest_cancel(msg->skb, prop);
1160attr_msg_full:
1161 nla_nest_cancel(msg->skb, attrs);
1162msg_full:
1163 genlmsg_cancel(msg->skb, hdr);
1164
1165 return -EMSGSIZE;
1166}
1167
1168int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1169{
1170 int err;
1171 int i = cb->args[0];
1172 struct tipc_nl_msg msg;
1173
1174 if (i == MAX_MEDIA)
1175 return 0;
1176
1177 msg.skb = skb;
1178 msg.portid = NETLINK_CB(cb->skb).portid;
1179 msg.seq = cb->nlh->nlmsg_seq;
1180
1181 rtnl_lock();
1182 for (; media_info_array[i] != NULL; i++) {
1183 err = __tipc_nl_add_media(&msg, media_info_array[i],
1184 NLM_F_MULTI);
1185 if (err)
1186 break;
1187 }
1188 rtnl_unlock();
1189
1190 cb->args[0] = i;
1191 return skb->len;
1192}
1193
1194int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1195{
1196 int err;
1197 char *name;
1198 struct tipc_nl_msg msg;
1199 struct tipc_media *media;
1200 struct sk_buff *rep;
1201 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1202
1203 if (!info->attrs[TIPC_NLA_MEDIA])
1204 return -EINVAL;
1205
1206 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1207 info->attrs[TIPC_NLA_MEDIA],
1208 tipc_nl_media_policy, info->extack);
1209 if (err)
1210 return err;
1211
1212 if (!attrs[TIPC_NLA_MEDIA_NAME])
1213 return -EINVAL;
1214 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1215
1216 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1217 if (!rep)
1218 return -ENOMEM;
1219
1220 msg.skb = rep;
1221 msg.portid = info->snd_portid;
1222 msg.seq = info->snd_seq;
1223
1224 rtnl_lock();
1225 media = tipc_media_find(name);
1226 if (!media) {
1227 err = -EINVAL;
1228 goto err_out;
1229 }
1230
1231 err = __tipc_nl_add_media(&msg, media, 0);
1232 if (err)
1233 goto err_out;
1234 rtnl_unlock();
1235
1236 return genlmsg_reply(rep, info);
1237err_out:
1238 rtnl_unlock();
1239 nlmsg_free(rep);
1240
1241 return err;
1242}
1243
1244int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1245{
1246 int err;
1247 char *name;
1248 struct tipc_media *m;
1249 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1250
1251 if (!info->attrs[TIPC_NLA_MEDIA])
1252 return -EINVAL;
1253
1254 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1255 info->attrs[TIPC_NLA_MEDIA],
1256 tipc_nl_media_policy, info->extack);
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 m = tipc_media_find(name);
1263 if (!m)
1264 return -EINVAL;
1265
1266 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1267 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1268
1269 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1270 props);
1271 if (err)
1272 return err;
1273
1274 if (props[TIPC_NLA_PROP_TOL])
1275 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1276 if (props[TIPC_NLA_PROP_PRIO])
1277 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1278 if (props[TIPC_NLA_PROP_WIN])
1279 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1280 if (props[TIPC_NLA_PROP_MTU]) {
1281 if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1282 return -EINVAL;
1283#ifdef CONFIG_TIPC_MEDIA_UDP
1284 if (tipc_udp_mtu_bad(nla_get_u32
1285 (props[TIPC_NLA_PROP_MTU])))
1286 return -EINVAL;
1287 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1288#endif
1289 }
1290 }
1291
1292 return 0;
1293}
1294
1295int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1296{
1297 int err;
1298
1299 rtnl_lock();
1300 err = __tipc_nl_media_set(skb, info);
1301 rtnl_unlock();
1302
1303 return err;
1304}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 * @name: name to locate
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 * @type: type identifier to locate
91 */
92static struct tipc_media *media_find_id(u8 type)
93{
94 u32 i;
95
96 for (i = 0; media_info_array[i] != NULL; i++) {
97 if (media_info_array[i]->type_id == type)
98 break;
99 }
100 return media_info_array[i];
101}
102
103/**
104 * tipc_media_addr_printf - record media address in print buffer
105 * @buf: output buffer
106 * @len: output buffer size remaining
107 * @a: input media address
108 */
109int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
110{
111 char addr_str[MAX_ADDR_STR];
112 struct tipc_media *m;
113 int ret;
114
115 m = media_find_id(a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf + ret, len - ret,
125 "-%x", a->value[i]);
126 }
127 return ret;
128}
129
130/**
131 * bearer_name_validate - validate & (optionally) deconstruct bearer name
132 * @name: ptr to bearer name string
133 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
134 *
135 * Return: 1 if bearer name is valid, otherwise 0.
136 */
137static int bearer_name_validate(const char *name,
138 struct tipc_bearer_names *name_parts)
139{
140 char name_copy[TIPC_MAX_BEARER_NAME];
141 char *media_name;
142 char *if_name;
143 u32 media_len;
144 u32 if_len;
145
146 /* copy bearer name & ensure length is OK */
147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0)
148 return 0;
149
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
153 if (if_name == NULL)
154 return 0;
155 *(if_name++) = 0;
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
158
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
162 return 0;
163
164 /* return bearer name components, if necessary */
165 if (name_parts) {
166 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 = tipc_net(net);
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_bearer *b;
215
216 rcu_read_lock();
217 b = bearer_get(net, bearer_id);
218 if (b)
219 tipc_disc_add_dest(b->disc);
220 rcu_read_unlock();
221}
222
223void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
224{
225 struct tipc_bearer *b;
226
227 rcu_read_lock();
228 b = bearer_get(net, bearer_id);
229 if (b)
230 tipc_disc_remove_dest(b->disc);
231 rcu_read_unlock();
232}
233
234/**
235 * tipc_enable_bearer - enable bearer with the given name
236 * @net: the applicable net namespace
237 * @name: bearer name to enable
238 * @disc_domain: bearer domain
239 * @prio: bearer priority
240 * @attr: nlattr array
241 * @extack: netlink extended ack
242 */
243static int tipc_enable_bearer(struct net *net, const char *name,
244 u32 disc_domain, u32 prio,
245 struct nlattr *attr[],
246 struct netlink_ext_ack *extack)
247{
248 struct tipc_net *tn = tipc_net(net);
249 struct tipc_bearer_names b_names;
250 int with_this_prio = 1;
251 struct tipc_bearer *b;
252 struct tipc_media *m;
253 struct sk_buff *skb;
254 int bearer_id = 0;
255 int res = -EINVAL;
256 char *errstr = "";
257 u32 i;
258
259 if (!bearer_name_validate(name, &b_names)) {
260 NL_SET_ERR_MSG(extack, "Illegal name");
261 return res;
262 }
263
264 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
265 errstr = "illegal priority";
266 NL_SET_ERR_MSG(extack, "Illegal priority");
267 goto rejected;
268 }
269
270 m = tipc_media_find(b_names.media_name);
271 if (!m) {
272 errstr = "media not registered";
273 NL_SET_ERR_MSG(extack, "Media not registered");
274 goto rejected;
275 }
276
277 if (prio == TIPC_MEDIA_LINK_PRI)
278 prio = m->priority;
279
280 /* Check new bearer vs existing ones and find free bearer id if any */
281 bearer_id = MAX_BEARERS;
282 i = MAX_BEARERS;
283 while (i-- != 0) {
284 b = rtnl_dereference(tn->bearer_list[i]);
285 if (!b) {
286 bearer_id = i;
287 continue;
288 }
289 if (!strcmp(name, b->name)) {
290 errstr = "already enabled";
291 NL_SET_ERR_MSG(extack, "Already enabled");
292 goto rejected;
293 }
294
295 if (b->priority == prio &&
296 (++with_this_prio > 2)) {
297 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
298 name, prio);
299
300 if (prio == TIPC_MIN_LINK_PRI) {
301 errstr = "cannot adjust to lower";
302 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
303 goto rejected;
304 }
305
306 pr_warn("Bearer <%s>: trying with adjusted priority\n",
307 name);
308 prio--;
309 bearer_id = MAX_BEARERS;
310 i = MAX_BEARERS;
311 with_this_prio = 1;
312 }
313 }
314
315 if (bearer_id >= MAX_BEARERS) {
316 errstr = "max 3 bearers permitted";
317 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
318 goto rejected;
319 }
320
321 b = kzalloc(sizeof(*b), GFP_ATOMIC);
322 if (!b)
323 return -ENOMEM;
324
325 strcpy(b->name, name);
326 b->media = m;
327 res = m->enable_media(net, b, attr);
328 if (res) {
329 kfree(b);
330 errstr = "failed to enable media";
331 NL_SET_ERR_MSG(extack, "Failed to enable media");
332 goto rejected;
333 }
334
335 b->identity = bearer_id;
336 b->tolerance = m->tolerance;
337 b->min_win = m->min_win;
338 b->max_win = m->max_win;
339 b->domain = disc_domain;
340 b->net_plane = bearer_id + 'A';
341 b->priority = prio;
342 refcount_set(&b->refcnt, 1);
343
344 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
345 if (res) {
346 bearer_disable(net, b);
347 errstr = "failed to create discoverer";
348 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
349 goto rejected;
350 }
351
352 /* Create monitoring data before accepting activate messages */
353 if (tipc_mon_create(net, bearer_id)) {
354 bearer_disable(net, b);
355 kfree_skb(skb);
356 return -ENOMEM;
357 }
358
359 test_and_set_bit_lock(0, &b->up);
360 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
361 if (skb)
362 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
363
364 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
365
366 return res;
367rejected:
368 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
369 return res;
370}
371
372/**
373 * tipc_reset_bearer - Reset all links established over this bearer
374 * @net: the applicable net namespace
375 * @b: the target bearer
376 */
377static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
378{
379 pr_info("Resetting bearer <%s>\n", b->name);
380 tipc_node_delete_links(net, b->identity);
381 tipc_disc_reset(net, b);
382 return 0;
383}
384
385bool tipc_bearer_hold(struct tipc_bearer *b)
386{
387 return (b && refcount_inc_not_zero(&b->refcnt));
388}
389
390void tipc_bearer_put(struct tipc_bearer *b)
391{
392 if (b && refcount_dec_and_test(&b->refcnt))
393 kfree_rcu(b, rcu);
394}
395
396/**
397 * bearer_disable - disable this bearer
398 * @net: the applicable net namespace
399 * @b: the bearer to disable
400 *
401 * Note: This routine assumes caller holds RTNL lock.
402 */
403static void bearer_disable(struct net *net, struct tipc_bearer *b)
404{
405 struct tipc_net *tn = tipc_net(net);
406 int bearer_id = b->identity;
407
408 pr_info("Disabling bearer <%s>\n", b->name);
409 clear_bit_unlock(0, &b->up);
410 tipc_node_delete_links(net, bearer_id);
411 b->media->disable_media(b);
412 RCU_INIT_POINTER(b->media_ptr, NULL);
413 if (b->disc)
414 tipc_disc_delete(b->disc);
415 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
416 tipc_bearer_put(b);
417 tipc_mon_delete(net, bearer_id);
418}
419
420int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
421 struct nlattr *attr[])
422{
423 char *dev_name = strchr((const char *)b->name, ':') + 1;
424 int hwaddr_len = b->media->hwaddr_len;
425 u8 node_id[NODE_ID_LEN] = {0,};
426 struct net_device *dev;
427
428 /* Find device with specified name */
429 dev = dev_get_by_name(net, dev_name);
430 if (!dev)
431 return -ENODEV;
432 if (tipc_mtu_bad(dev)) {
433 dev_put(dev);
434 return -EINVAL;
435 }
436 if (dev == net->loopback_dev) {
437 dev_put(dev);
438 pr_info("Enabling <%s> not permitted\n", b->name);
439 return -EINVAL;
440 }
441
442 /* Autoconfigure own node identity if needed */
443 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
444 memcpy(node_id, dev->dev_addr, hwaddr_len);
445 tipc_net_init(net, node_id, 0);
446 }
447 if (!tipc_own_id(net)) {
448 dev_put(dev);
449 pr_warn("Failed to obtain node identity\n");
450 return -EINVAL;
451 }
452
453 /* Associate TIPC bearer with L2 bearer */
454 rcu_assign_pointer(b->media_ptr, dev);
455 b->pt.dev = dev;
456 b->pt.type = htons(ETH_P_TIPC);
457 b->pt.func = tipc_l2_rcv_msg;
458 dev_add_pack(&b->pt);
459 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
460 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
461 b->bcast_addr.media_id = b->media->type_id;
462 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
463 b->mtu = dev->mtu;
464 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
465 rcu_assign_pointer(dev->tipc_ptr, b);
466 return 0;
467}
468
469/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
470 * @b: the target bearer
471 *
472 * Mark L2 bearer as inactive so that incoming buffers are thrown away
473 */
474void tipc_disable_l2_media(struct tipc_bearer *b)
475{
476 struct net_device *dev;
477
478 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
479 dev_remove_pack(&b->pt);
480 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
481 synchronize_net();
482 dev_put(dev);
483}
484
485/**
486 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
487 * @net: the associated network namespace
488 * @skb: the packet to be sent
489 * @b: the bearer through which the packet is to be sent
490 * @dest: peer destination address
491 */
492int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
493 struct tipc_bearer *b, struct tipc_media_addr *dest)
494{
495 struct net_device *dev;
496 int delta;
497
498 dev = (struct net_device *)rcu_dereference(b->media_ptr);
499 if (!dev)
500 return 0;
501
502 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
503 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
504 kfree_skb(skb);
505 return 0;
506 }
507 skb_reset_network_header(skb);
508 skb->dev = dev;
509 skb->protocol = htons(ETH_P_TIPC);
510 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
511 dev->dev_addr, skb->len);
512 dev_queue_xmit(skb);
513 return 0;
514}
515
516bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
517{
518 bool supp = false;
519 struct tipc_bearer *b;
520
521 rcu_read_lock();
522 b = bearer_get(net, bearer_id);
523 if (b)
524 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
525 rcu_read_unlock();
526 return supp;
527}
528
529int tipc_bearer_mtu(struct net *net, u32 bearer_id)
530{
531 int mtu = 0;
532 struct tipc_bearer *b;
533
534 rcu_read_lock();
535 b = bearer_get(net, bearer_id);
536 if (b)
537 mtu = b->mtu;
538 rcu_read_unlock();
539 return mtu;
540}
541
542int tipc_bearer_min_mtu(struct net *net, u32 bearer_id)
543{
544 int mtu = TIPC_MIN_BEARER_MTU;
545 struct tipc_bearer *b;
546
547 rcu_read_lock();
548 b = bearer_get(net, bearer_id);
549 if (b)
550 mtu += b->encap_hlen;
551 rcu_read_unlock();
552 return mtu;
553}
554
555/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
556 */
557void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
558 struct sk_buff *skb,
559 struct tipc_media_addr *dest)
560{
561 struct tipc_msg *hdr = buf_msg(skb);
562 struct tipc_bearer *b;
563
564 rcu_read_lock();
565 b = bearer_get(net, bearer_id);
566 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
567#ifdef CONFIG_TIPC_CRYPTO
568 tipc_crypto_xmit(net, &skb, b, dest, NULL);
569 if (skb)
570#endif
571 b->media->send_msg(net, skb, b, dest);
572 } else {
573 kfree_skb(skb);
574 }
575 rcu_read_unlock();
576}
577
578/* tipc_bearer_xmit() -send buffer to destination over bearer
579 */
580void tipc_bearer_xmit(struct net *net, u32 bearer_id,
581 struct sk_buff_head *xmitq,
582 struct tipc_media_addr *dst,
583 struct tipc_node *__dnode)
584{
585 struct tipc_bearer *b;
586 struct sk_buff *skb, *tmp;
587
588 if (skb_queue_empty(xmitq))
589 return;
590
591 rcu_read_lock();
592 b = bearer_get(net, bearer_id);
593 if (unlikely(!b))
594 __skb_queue_purge(xmitq);
595 skb_queue_walk_safe(xmitq, skb, tmp) {
596 __skb_dequeue(xmitq);
597 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
598#ifdef CONFIG_TIPC_CRYPTO
599 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
600 if (skb)
601#endif
602 b->media->send_msg(net, skb, b, dst);
603 } else {
604 kfree_skb(skb);
605 }
606 }
607 rcu_read_unlock();
608}
609
610/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
611 */
612void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
613 struct sk_buff_head *xmitq)
614{
615 struct tipc_net *tn = tipc_net(net);
616 struct tipc_media_addr *dst;
617 int net_id = tn->net_id;
618 struct tipc_bearer *b;
619 struct sk_buff *skb, *tmp;
620 struct tipc_msg *hdr;
621
622 rcu_read_lock();
623 b = bearer_get(net, bearer_id);
624 if (unlikely(!b || !test_bit(0, &b->up)))
625 __skb_queue_purge(xmitq);
626 skb_queue_walk_safe(xmitq, skb, tmp) {
627 hdr = buf_msg(skb);
628 msg_set_non_seq(hdr, 1);
629 msg_set_mc_netid(hdr, net_id);
630 __skb_dequeue(xmitq);
631 dst = &b->bcast_addr;
632#ifdef CONFIG_TIPC_CRYPTO
633 tipc_crypto_xmit(net, &skb, b, dst, NULL);
634 if (skb)
635#endif
636 b->media->send_msg(net, skb, b, dst);
637 }
638 rcu_read_unlock();
639}
640
641/**
642 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
643 * @skb: the received message
644 * @dev: the net device that the packet was received on
645 * @pt: the packet_type structure which was used to register this handler
646 * @orig_dev: the original receive net device in case the device is a bond
647 *
648 * Accept only packets explicitly sent to this node, or broadcast packets;
649 * ignores packets sent using interface multicast, and traffic sent to other
650 * nodes (which can happen if interface is running in promiscuous mode).
651 */
652static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
653 struct packet_type *pt, struct net_device *orig_dev)
654{
655 struct tipc_bearer *b;
656
657 rcu_read_lock();
658 b = rcu_dereference(dev->tipc_ptr) ?:
659 rcu_dereference(orig_dev->tipc_ptr);
660 if (likely(b && test_bit(0, &b->up) &&
661 (skb->pkt_type <= PACKET_MULTICAST))) {
662 skb_mark_not_on_list(skb);
663 TIPC_SKB_CB(skb)->flags = 0;
664 tipc_rcv(dev_net(b->pt.dev), skb, b);
665 rcu_read_unlock();
666 return NET_RX_SUCCESS;
667 }
668 rcu_read_unlock();
669 kfree_skb(skb);
670 return NET_RX_DROP;
671}
672
673/**
674 * tipc_l2_device_event - handle device events from network device
675 * @nb: the context of the notification
676 * @evt: the type of event
677 * @ptr: the net device that the event was on
678 *
679 * This function is called by the Ethernet driver in case of link
680 * change event.
681 */
682static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
683 void *ptr)
684{
685 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
686 struct net *net = dev_net(dev);
687 struct tipc_bearer *b;
688
689 b = rtnl_dereference(dev->tipc_ptr);
690 if (!b)
691 return NOTIFY_DONE;
692
693 trace_tipc_l2_device_event(dev, b, evt);
694 switch (evt) {
695 case NETDEV_CHANGE:
696 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
697 test_and_set_bit_lock(0, &b->up);
698 break;
699 }
700 fallthrough;
701 case NETDEV_GOING_DOWN:
702 clear_bit_unlock(0, &b->up);
703 tipc_reset_bearer(net, b);
704 break;
705 case NETDEV_UP:
706 test_and_set_bit_lock(0, &b->up);
707 break;
708 case NETDEV_CHANGEMTU:
709 if (tipc_mtu_bad(dev)) {
710 bearer_disable(net, b);
711 break;
712 }
713 b->mtu = dev->mtu;
714 tipc_reset_bearer(net, b);
715 break;
716 case NETDEV_CHANGEADDR:
717 b->media->raw2addr(b, &b->addr,
718 (const char *)dev->dev_addr);
719 tipc_reset_bearer(net, b);
720 break;
721 case NETDEV_UNREGISTER:
722 case NETDEV_CHANGENAME:
723 bearer_disable(net, b);
724 break;
725 }
726 return NOTIFY_OK;
727}
728
729static struct notifier_block notifier = {
730 .notifier_call = tipc_l2_device_event,
731 .priority = 0,
732};
733
734int tipc_bearer_setup(void)
735{
736 return register_netdevice_notifier(¬ifier);
737}
738
739void tipc_bearer_cleanup(void)
740{
741 unregister_netdevice_notifier(¬ifier);
742}
743
744void tipc_bearer_stop(struct net *net)
745{
746 struct tipc_net *tn = tipc_net(net);
747 struct tipc_bearer *b;
748 u32 i;
749
750 for (i = 0; i < MAX_BEARERS; i++) {
751 b = rtnl_dereference(tn->bearer_list[i]);
752 if (b) {
753 bearer_disable(net, b);
754 tn->bearer_list[i] = NULL;
755 }
756 }
757}
758
759void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
760{
761 struct net_device *dev = net->loopback_dev;
762 struct sk_buff *skb, *_skb;
763 int exp;
764
765 skb_queue_walk(pkts, _skb) {
766 skb = pskb_copy(_skb, GFP_ATOMIC);
767 if (!skb)
768 continue;
769
770 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
771 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
772 kfree_skb(skb);
773 continue;
774 }
775
776 skb_reset_network_header(skb);
777 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
778 dev->dev_addr, skb->len);
779 skb->dev = dev;
780 skb->pkt_type = PACKET_HOST;
781 skb->ip_summed = CHECKSUM_UNNECESSARY;
782 skb->protocol = eth_type_trans(skb, dev);
783 netif_rx(skb);
784 }
785}
786
787static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
788 struct packet_type *pt, struct net_device *od)
789{
790 consume_skb(skb);
791 return NET_RX_SUCCESS;
792}
793
794int tipc_attach_loopback(struct net *net)
795{
796 struct net_device *dev = net->loopback_dev;
797 struct tipc_net *tn = tipc_net(net);
798
799 if (!dev)
800 return -ENODEV;
801
802 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
803 tn->loopback_pt.dev = dev;
804 tn->loopback_pt.type = htons(ETH_P_TIPC);
805 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
806 dev_add_pack(&tn->loopback_pt);
807 return 0;
808}
809
810void tipc_detach_loopback(struct net *net)
811{
812 struct tipc_net *tn = tipc_net(net);
813
814 dev_remove_pack(&tn->loopback_pt);
815 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker);
816}
817
818/* Caller should hold rtnl_lock to protect the bearer */
819static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
820 struct tipc_bearer *bearer, int nlflags)
821{
822 void *hdr;
823 struct nlattr *attrs;
824 struct nlattr *prop;
825
826 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
827 nlflags, TIPC_NL_BEARER_GET);
828 if (!hdr)
829 return -EMSGSIZE;
830
831 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
832 if (!attrs)
833 goto msg_full;
834
835 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
836 goto attr_msg_full;
837
838 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
839 if (!prop)
840 goto prop_msg_full;
841 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
842 goto prop_msg_full;
843 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
844 goto prop_msg_full;
845 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
846 goto prop_msg_full;
847 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
848 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
849 goto prop_msg_full;
850
851 nla_nest_end(msg->skb, prop);
852
853#ifdef CONFIG_TIPC_MEDIA_UDP
854 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
855 if (tipc_udp_nl_add_bearer_data(msg, bearer))
856 goto attr_msg_full;
857 }
858#endif
859
860 nla_nest_end(msg->skb, attrs);
861 genlmsg_end(msg->skb, hdr);
862
863 return 0;
864
865prop_msg_full:
866 nla_nest_cancel(msg->skb, prop);
867attr_msg_full:
868 nla_nest_cancel(msg->skb, attrs);
869msg_full:
870 genlmsg_cancel(msg->skb, hdr);
871
872 return -EMSGSIZE;
873}
874
875int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
876{
877 int err;
878 int i = cb->args[0];
879 struct tipc_bearer *bearer;
880 struct tipc_nl_msg msg;
881 struct net *net = sock_net(skb->sk);
882 struct tipc_net *tn = tipc_net(net);
883
884 if (i == MAX_BEARERS)
885 return 0;
886
887 msg.skb = skb;
888 msg.portid = NETLINK_CB(cb->skb).portid;
889 msg.seq = cb->nlh->nlmsg_seq;
890
891 rtnl_lock();
892 for (i = 0; i < MAX_BEARERS; i++) {
893 bearer = rtnl_dereference(tn->bearer_list[i]);
894 if (!bearer)
895 continue;
896
897 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
898 if (err)
899 break;
900 }
901 rtnl_unlock();
902
903 cb->args[0] = i;
904 return skb->len;
905}
906
907int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
908{
909 int err;
910 char *name;
911 struct sk_buff *rep;
912 struct tipc_bearer *bearer;
913 struct tipc_nl_msg msg;
914 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
915 struct net *net = genl_info_net(info);
916
917 if (!info->attrs[TIPC_NLA_BEARER])
918 return -EINVAL;
919
920 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
921 info->attrs[TIPC_NLA_BEARER],
922 tipc_nl_bearer_policy, info->extack);
923 if (err)
924 return err;
925
926 if (!attrs[TIPC_NLA_BEARER_NAME])
927 return -EINVAL;
928 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
929
930 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
931 if (!rep)
932 return -ENOMEM;
933
934 msg.skb = rep;
935 msg.portid = info->snd_portid;
936 msg.seq = info->snd_seq;
937
938 rtnl_lock();
939 bearer = tipc_bearer_find(net, name);
940 if (!bearer) {
941 err = -EINVAL;
942 NL_SET_ERR_MSG(info->extack, "Bearer not found");
943 goto err_out;
944 }
945
946 err = __tipc_nl_add_bearer(&msg, bearer, 0);
947 if (err)
948 goto err_out;
949 rtnl_unlock();
950
951 return genlmsg_reply(rep, info);
952err_out:
953 rtnl_unlock();
954 nlmsg_free(rep);
955
956 return err;
957}
958
959int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
960{
961 int err;
962 char *name;
963 struct tipc_bearer *bearer;
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_deprecated(attrs, TIPC_NLA_BEARER_MAX,
971 info->attrs[TIPC_NLA_BEARER],
972 tipc_nl_bearer_policy, info->extack);
973 if (err)
974 return err;
975
976 if (!attrs[TIPC_NLA_BEARER_NAME])
977 return -EINVAL;
978
979 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
980
981 bearer = tipc_bearer_find(net, name);
982 if (!bearer) {
983 NL_SET_ERR_MSG(info->extack, "Bearer not found");
984 return -EINVAL;
985 }
986
987 bearer_disable(net, bearer);
988
989 return 0;
990}
991
992int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
993{
994 int err;
995
996 rtnl_lock();
997 err = __tipc_nl_bearer_disable(skb, info);
998 rtnl_unlock();
999
1000 return err;
1001}
1002
1003int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1004{
1005 int err;
1006 char *bearer;
1007 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1008 struct net *net = sock_net(skb->sk);
1009 u32 domain = 0;
1010 u32 prio;
1011
1012 prio = TIPC_MEDIA_LINK_PRI;
1013
1014 if (!info->attrs[TIPC_NLA_BEARER])
1015 return -EINVAL;
1016
1017 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1018 info->attrs[TIPC_NLA_BEARER],
1019 tipc_nl_bearer_policy, info->extack);
1020 if (err)
1021 return err;
1022
1023 if (!attrs[TIPC_NLA_BEARER_NAME])
1024 return -EINVAL;
1025
1026 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1027
1028 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1029 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1030
1031 if (attrs[TIPC_NLA_BEARER_PROP]) {
1032 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1033
1034 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1035 props);
1036 if (err)
1037 return err;
1038
1039 if (props[TIPC_NLA_PROP_PRIO])
1040 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1041 }
1042
1043 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1044 info->extack);
1045}
1046
1047int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1048{
1049 int err;
1050
1051 rtnl_lock();
1052 err = __tipc_nl_bearer_enable(skb, info);
1053 rtnl_unlock();
1054
1055 return err;
1056}
1057
1058int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1059{
1060 int err;
1061 char *name;
1062 struct tipc_bearer *b;
1063 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1064 struct net *net = sock_net(skb->sk);
1065
1066 if (!info->attrs[TIPC_NLA_BEARER])
1067 return -EINVAL;
1068
1069 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1070 info->attrs[TIPC_NLA_BEARER],
1071 tipc_nl_bearer_policy, info->extack);
1072 if (err)
1073 return err;
1074
1075 if (!attrs[TIPC_NLA_BEARER_NAME])
1076 return -EINVAL;
1077 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1078
1079 rtnl_lock();
1080 b = tipc_bearer_find(net, name);
1081 if (!b) {
1082 rtnl_unlock();
1083 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1084 return -EINVAL;
1085 }
1086
1087#ifdef CONFIG_TIPC_MEDIA_UDP
1088 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1089 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1090 rtnl_unlock();
1091 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1092 return -EINVAL;
1093 }
1094
1095 err = tipc_udp_nl_bearer_add(b,
1096 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1097 if (err) {
1098 rtnl_unlock();
1099 return err;
1100 }
1101 }
1102#endif
1103 rtnl_unlock();
1104
1105 return 0;
1106}
1107
1108int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1109{
1110 struct tipc_bearer *b;
1111 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1112 struct net *net = sock_net(skb->sk);
1113 char *name;
1114 int err;
1115
1116 if (!info->attrs[TIPC_NLA_BEARER])
1117 return -EINVAL;
1118
1119 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1120 info->attrs[TIPC_NLA_BEARER],
1121 tipc_nl_bearer_policy, info->extack);
1122 if (err)
1123 return err;
1124
1125 if (!attrs[TIPC_NLA_BEARER_NAME])
1126 return -EINVAL;
1127 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1128
1129 b = tipc_bearer_find(net, name);
1130 if (!b) {
1131 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1132 return -EINVAL;
1133 }
1134
1135 if (attrs[TIPC_NLA_BEARER_PROP]) {
1136 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1137
1138 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1139 props);
1140 if (err)
1141 return err;
1142
1143 if (props[TIPC_NLA_PROP_TOL]) {
1144 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1145 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1146 }
1147 if (props[TIPC_NLA_PROP_PRIO])
1148 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1149 if (props[TIPC_NLA_PROP_WIN])
1150 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1151 if (props[TIPC_NLA_PROP_MTU]) {
1152 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1153 NL_SET_ERR_MSG(info->extack,
1154 "MTU property is unsupported");
1155 return -EINVAL;
1156 }
1157#ifdef CONFIG_TIPC_MEDIA_UDP
1158 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1159 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1160 NL_SET_ERR_MSG(info->extack,
1161 "MTU value is out-of-range");
1162 return -EINVAL;
1163 }
1164 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1165 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1166#endif
1167 }
1168 }
1169
1170 return 0;
1171}
1172
1173int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1174{
1175 int err;
1176
1177 rtnl_lock();
1178 err = __tipc_nl_bearer_set(skb, info);
1179 rtnl_unlock();
1180
1181 return err;
1182}
1183
1184static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1185 struct tipc_media *media, int nlflags)
1186{
1187 void *hdr;
1188 struct nlattr *attrs;
1189 struct nlattr *prop;
1190
1191 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1192 nlflags, TIPC_NL_MEDIA_GET);
1193 if (!hdr)
1194 return -EMSGSIZE;
1195
1196 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1197 if (!attrs)
1198 goto msg_full;
1199
1200 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1201 goto attr_msg_full;
1202
1203 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1204 if (!prop)
1205 goto prop_msg_full;
1206 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1207 goto prop_msg_full;
1208 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1209 goto prop_msg_full;
1210 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1211 goto prop_msg_full;
1212 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1213 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1214 goto prop_msg_full;
1215
1216 nla_nest_end(msg->skb, prop);
1217 nla_nest_end(msg->skb, attrs);
1218 genlmsg_end(msg->skb, hdr);
1219
1220 return 0;
1221
1222prop_msg_full:
1223 nla_nest_cancel(msg->skb, prop);
1224attr_msg_full:
1225 nla_nest_cancel(msg->skb, attrs);
1226msg_full:
1227 genlmsg_cancel(msg->skb, hdr);
1228
1229 return -EMSGSIZE;
1230}
1231
1232int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1233{
1234 int err;
1235 int i = cb->args[0];
1236 struct tipc_nl_msg msg;
1237
1238 if (i == MAX_MEDIA)
1239 return 0;
1240
1241 msg.skb = skb;
1242 msg.portid = NETLINK_CB(cb->skb).portid;
1243 msg.seq = cb->nlh->nlmsg_seq;
1244
1245 rtnl_lock();
1246 for (; media_info_array[i] != NULL; i++) {
1247 err = __tipc_nl_add_media(&msg, media_info_array[i],
1248 NLM_F_MULTI);
1249 if (err)
1250 break;
1251 }
1252 rtnl_unlock();
1253
1254 cb->args[0] = i;
1255 return skb->len;
1256}
1257
1258int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1259{
1260 int err;
1261 char *name;
1262 struct tipc_nl_msg msg;
1263 struct tipc_media *media;
1264 struct sk_buff *rep;
1265 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1266
1267 if (!info->attrs[TIPC_NLA_MEDIA])
1268 return -EINVAL;
1269
1270 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1271 info->attrs[TIPC_NLA_MEDIA],
1272 tipc_nl_media_policy, info->extack);
1273 if (err)
1274 return err;
1275
1276 if (!attrs[TIPC_NLA_MEDIA_NAME])
1277 return -EINVAL;
1278 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1279
1280 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1281 if (!rep)
1282 return -ENOMEM;
1283
1284 msg.skb = rep;
1285 msg.portid = info->snd_portid;
1286 msg.seq = info->snd_seq;
1287
1288 rtnl_lock();
1289 media = tipc_media_find(name);
1290 if (!media) {
1291 NL_SET_ERR_MSG(info->extack, "Media not found");
1292 err = -EINVAL;
1293 goto err_out;
1294 }
1295
1296 err = __tipc_nl_add_media(&msg, media, 0);
1297 if (err)
1298 goto err_out;
1299 rtnl_unlock();
1300
1301 return genlmsg_reply(rep, info);
1302err_out:
1303 rtnl_unlock();
1304 nlmsg_free(rep);
1305
1306 return err;
1307}
1308
1309int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1310{
1311 int err;
1312 char *name;
1313 struct tipc_media *m;
1314 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1315
1316 if (!info->attrs[TIPC_NLA_MEDIA])
1317 return -EINVAL;
1318
1319 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1320 info->attrs[TIPC_NLA_MEDIA],
1321 tipc_nl_media_policy, info->extack);
1322
1323 if (!attrs[TIPC_NLA_MEDIA_NAME])
1324 return -EINVAL;
1325 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1326
1327 m = tipc_media_find(name);
1328 if (!m) {
1329 NL_SET_ERR_MSG(info->extack, "Media not found");
1330 return -EINVAL;
1331 }
1332 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1333 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1334
1335 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1336 props);
1337 if (err)
1338 return err;
1339
1340 if (props[TIPC_NLA_PROP_TOL])
1341 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1342 if (props[TIPC_NLA_PROP_PRIO])
1343 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1344 if (props[TIPC_NLA_PROP_WIN])
1345 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1346 if (props[TIPC_NLA_PROP_MTU]) {
1347 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1348 NL_SET_ERR_MSG(info->extack,
1349 "MTU property is unsupported");
1350 return -EINVAL;
1351 }
1352#ifdef CONFIG_TIPC_MEDIA_UDP
1353 if (tipc_udp_mtu_bad(nla_get_u32
1354 (props[TIPC_NLA_PROP_MTU]))) {
1355 NL_SET_ERR_MSG(info->extack,
1356 "MTU value is out-of-range");
1357 return -EINVAL;
1358 }
1359 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1360#endif
1361 }
1362 }
1363
1364 return 0;
1365}
1366
1367int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1368{
1369 int err;
1370
1371 rtnl_lock();
1372 err = __tipc_nl_media_set(skb, info);
1373 rtnl_unlock();
1374
1375 return err;
1376}