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Merge tag 'hsi-for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi
[mirror_ubuntu-hirsute-kernel.git] / net / tipc / bearer.c
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
48 #define MAX_ADDR_STR 60
49
50 static struct tipc_media * const media_info_array[] = {
51 &eth_media_info,
52 #ifdef CONFIG_TIPC_MEDIA_IB
53 &ib_media_info,
54 #endif
55 #ifdef CONFIG_TIPC_MEDIA_UDP
56 &udp_media_info,
57 #endif
58 NULL
59 };
60
61 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
62 {
63 struct tipc_net *tn = tipc_net(net);
64
65 return rcu_dereference(tn->bearer_list[bearer_id]);
66 }
67
68 static void bearer_disable(struct net *net, struct tipc_bearer *b);
69 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
70 struct packet_type *pt, struct net_device *orig_dev);
71
72 /**
73 * tipc_media_find - locates specified media object by name
74 */
75 struct tipc_media *tipc_media_find(const char *name)
76 {
77 u32 i;
78
79 for (i = 0; media_info_array[i] != NULL; i++) {
80 if (!strcmp(media_info_array[i]->name, name))
81 break;
82 }
83 return media_info_array[i];
84 }
85
86 /**
87 * media_find_id - locates specified media object by type identifier
88 */
89 static struct tipc_media *media_find_id(u8 type)
90 {
91 u32 i;
92
93 for (i = 0; media_info_array[i] != NULL; i++) {
94 if (media_info_array[i]->type_id == type)
95 break;
96 }
97 return media_info_array[i];
98 }
99
100 /**
101 * tipc_media_addr_printf - record media address in print buffer
102 */
103 int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
104 {
105 char addr_str[MAX_ADDR_STR];
106 struct tipc_media *m;
107 int ret;
108
109 m = media_find_id(a->media_id);
110
111 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
112 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
113 else {
114 u32 i;
115
116 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
117 for (i = 0; i < sizeof(a->value); i++)
118 ret += scnprintf(buf + ret, len - ret,
119 "-%x", a->value[i]);
120 }
121 return ret;
122 }
123
124 /**
125 * bearer_name_validate - validate & (optionally) deconstruct bearer name
126 * @name: ptr to bearer name string
127 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
128 *
129 * Returns 1 if bearer name is valid, otherwise 0.
130 */
131 static int bearer_name_validate(const char *name,
132 struct tipc_bearer_names *name_parts)
133 {
134 char name_copy[TIPC_MAX_BEARER_NAME];
135 char *media_name;
136 char *if_name;
137 u32 media_len;
138 u32 if_len;
139
140 /* copy bearer name & ensure length is OK */
141 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
142 /* need above in case non-Posix strncpy() doesn't pad with nulls */
143 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
144 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
145 return 0;
146
147 /* ensure all component parts of bearer name are present */
148 media_name = name_copy;
149 if_name = strchr(media_name, ':');
150 if (if_name == NULL)
151 return 0;
152 *(if_name++) = 0;
153 media_len = if_name - media_name;
154 if_len = strlen(if_name) + 1;
155
156 /* validate component parts of bearer name */
157 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
158 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
159 return 0;
160
161 /* return bearer name components, if necessary */
162 if (name_parts) {
163 strcpy(name_parts->media_name, media_name);
164 strcpy(name_parts->if_name, if_name);
165 }
166 return 1;
167 }
168
169 /**
170 * tipc_bearer_find - locates bearer object with matching bearer name
171 */
172 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
173 {
174 struct tipc_net *tn = net_generic(net, tipc_net_id);
175 struct tipc_bearer *b;
176 u32 i;
177
178 for (i = 0; i < MAX_BEARERS; i++) {
179 b = rtnl_dereference(tn->bearer_list[i]);
180 if (b && (!strcmp(b->name, name)))
181 return b;
182 }
183 return NULL;
184 }
185
186 /* tipc_bearer_get_name - get the bearer name from its id.
187 * @net: network namespace
188 * @name: a pointer to the buffer where the name will be stored.
189 * @bearer_id: the id to get the name from.
190 */
191 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
192 {
193 struct tipc_net *tn = tipc_net(net);
194 struct tipc_bearer *b;
195
196 if (bearer_id >= MAX_BEARERS)
197 return -EINVAL;
198
199 b = rtnl_dereference(tn->bearer_list[bearer_id]);
200 if (!b)
201 return -EINVAL;
202
203 strcpy(name, b->name);
204 return 0;
205 }
206
207 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
208 {
209 struct tipc_net *tn = net_generic(net, tipc_net_id);
210 struct tipc_bearer *b;
211
212 rcu_read_lock();
213 b = rcu_dereference(tn->bearer_list[bearer_id]);
214 if (b)
215 tipc_disc_add_dest(b->disc);
216 rcu_read_unlock();
217 }
218
219 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
220 {
221 struct tipc_net *tn = net_generic(net, tipc_net_id);
222 struct tipc_bearer *b;
223
224 rcu_read_lock();
225 b = rcu_dereference(tn->bearer_list[bearer_id]);
226 if (b)
227 tipc_disc_remove_dest(b->disc);
228 rcu_read_unlock();
229 }
230
231 /**
232 * tipc_enable_bearer - enable bearer with the given name
233 */
234 static int tipc_enable_bearer(struct net *net, const char *name,
235 u32 disc_domain, u32 prio,
236 struct nlattr *attr[])
237 {
238 struct tipc_net *tn = tipc_net(net);
239 struct tipc_bearer_names b_names;
240 int with_this_prio = 1;
241 struct tipc_bearer *b;
242 struct tipc_media *m;
243 struct sk_buff *skb;
244 int bearer_id = 0;
245 int res = -EINVAL;
246 char *errstr = "";
247
248 if (!bearer_name_validate(name, &b_names)) {
249 errstr = "illegal name";
250 goto rejected;
251 }
252
253 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
254 errstr = "illegal priority";
255 goto rejected;
256 }
257
258 m = tipc_media_find(b_names.media_name);
259 if (!m) {
260 errstr = "media not registered";
261 goto rejected;
262 }
263
264 if (prio == TIPC_MEDIA_LINK_PRI)
265 prio = m->priority;
266
267 /* Check new bearer vs existing ones and find free bearer id if any */
268 while (bearer_id < MAX_BEARERS) {
269 b = rtnl_dereference(tn->bearer_list[bearer_id]);
270 if (!b)
271 break;
272 if (!strcmp(name, b->name)) {
273 errstr = "already enabled";
274 goto rejected;
275 }
276 bearer_id++;
277 if (b->priority != prio)
278 continue;
279 if (++with_this_prio <= 2)
280 continue;
281 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
282 name, prio);
283 if (prio == TIPC_MIN_LINK_PRI) {
284 errstr = "cannot adjust to lower";
285 goto rejected;
286 }
287 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
288 prio--;
289 bearer_id = 0;
290 with_this_prio = 1;
291 }
292
293 if (bearer_id >= MAX_BEARERS) {
294 errstr = "max 3 bearers permitted";
295 goto rejected;
296 }
297
298 b = kzalloc(sizeof(*b), GFP_ATOMIC);
299 if (!b)
300 return -ENOMEM;
301
302 strcpy(b->name, name);
303 b->media = m;
304 res = m->enable_media(net, b, attr);
305 if (res) {
306 kfree(b);
307 errstr = "failed to enable media";
308 goto rejected;
309 }
310
311 b->identity = bearer_id;
312 b->tolerance = m->tolerance;
313 b->window = m->window;
314 b->domain = disc_domain;
315 b->net_plane = bearer_id + 'A';
316 b->priority = prio;
317 test_and_set_bit_lock(0, &b->up);
318
319 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
320 if (res) {
321 bearer_disable(net, b);
322 errstr = "failed to create discoverer";
323 goto rejected;
324 }
325
326 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
327 if (skb)
328 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
329
330 if (tipc_mon_create(net, bearer_id)) {
331 bearer_disable(net, b);
332 return -ENOMEM;
333 }
334
335 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
336
337 return res;
338 rejected:
339 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
340 return res;
341 }
342
343 /**
344 * tipc_reset_bearer - Reset all links established over this bearer
345 */
346 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
347 {
348 pr_info("Resetting bearer <%s>\n", b->name);
349 tipc_node_delete_links(net, b->identity);
350 tipc_disc_reset(net, b);
351 return 0;
352 }
353
354 /**
355 * bearer_disable
356 *
357 * Note: This routine assumes caller holds RTNL lock.
358 */
359 static void bearer_disable(struct net *net, struct tipc_bearer *b)
360 {
361 struct tipc_net *tn = tipc_net(net);
362 int bearer_id = b->identity;
363
364 pr_info("Disabling bearer <%s>\n", b->name);
365 clear_bit_unlock(0, &b->up);
366 tipc_node_delete_links(net, bearer_id);
367 b->media->disable_media(b);
368 RCU_INIT_POINTER(b->media_ptr, NULL);
369 if (b->disc)
370 tipc_disc_delete(b->disc);
371 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
372 kfree_rcu(b, rcu);
373 tipc_mon_delete(net, bearer_id);
374 }
375
376 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
377 struct nlattr *attr[])
378 {
379 char *dev_name = strchr((const char *)b->name, ':') + 1;
380 int hwaddr_len = b->media->hwaddr_len;
381 u8 node_id[NODE_ID_LEN] = {0,};
382 struct net_device *dev;
383
384 /* Find device with specified name */
385 dev = dev_get_by_name(net, dev_name);
386 if (!dev)
387 return -ENODEV;
388 if (tipc_mtu_bad(dev, 0)) {
389 dev_put(dev);
390 return -EINVAL;
391 }
392 if (dev == net->loopback_dev) {
393 dev_put(dev);
394 pr_info("Enabling <%s> not permitted\n", b->name);
395 return -EINVAL;
396 }
397
398 /* Autoconfigure own node identity if needed */
399 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
400 memcpy(node_id, dev->dev_addr, hwaddr_len);
401 tipc_net_init(net, node_id, 0);
402 }
403 if (!tipc_own_id(net)) {
404 dev_put(dev);
405 pr_warn("Failed to obtain node identity\n");
406 return -EINVAL;
407 }
408
409 /* Associate TIPC bearer with L2 bearer */
410 rcu_assign_pointer(b->media_ptr, dev);
411 b->pt.dev = dev;
412 b->pt.type = htons(ETH_P_TIPC);
413 b->pt.func = tipc_l2_rcv_msg;
414 dev_add_pack(&b->pt);
415 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
416 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
417 b->bcast_addr.media_id = b->media->type_id;
418 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
419 b->mtu = dev->mtu;
420 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
421 rcu_assign_pointer(dev->tipc_ptr, b);
422 return 0;
423 }
424
425 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
426 *
427 * Mark L2 bearer as inactive so that incoming buffers are thrown away
428 */
429 void tipc_disable_l2_media(struct tipc_bearer *b)
430 {
431 struct net_device *dev;
432
433 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
434 dev_remove_pack(&b->pt);
435 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
436 synchronize_net();
437 dev_put(dev);
438 }
439
440 /**
441 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
442 * @skb: the packet to be sent
443 * @b: the bearer through which the packet is to be sent
444 * @dest: peer destination address
445 */
446 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
447 struct tipc_bearer *b, struct tipc_media_addr *dest)
448 {
449 struct net_device *dev;
450 int delta;
451
452 dev = (struct net_device *)rcu_dereference(b->media_ptr);
453 if (!dev)
454 return 0;
455
456 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
457 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
458 kfree_skb(skb);
459 return 0;
460 }
461 skb_reset_network_header(skb);
462 skb->dev = dev;
463 skb->protocol = htons(ETH_P_TIPC);
464 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
465 dev->dev_addr, skb->len);
466 dev_queue_xmit(skb);
467 return 0;
468 }
469
470 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
471 {
472 bool supp = false;
473 struct tipc_bearer *b;
474
475 rcu_read_lock();
476 b = bearer_get(net, bearer_id);
477 if (b)
478 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
479 rcu_read_unlock();
480 return supp;
481 }
482
483 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
484 {
485 int mtu = 0;
486 struct tipc_bearer *b;
487
488 rcu_read_lock();
489 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
490 if (b)
491 mtu = b->mtu;
492 rcu_read_unlock();
493 return mtu;
494 }
495
496 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
497 */
498 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
499 struct sk_buff *skb,
500 struct tipc_media_addr *dest)
501 {
502 struct tipc_msg *hdr = buf_msg(skb);
503 struct tipc_bearer *b;
504
505 rcu_read_lock();
506 b = bearer_get(net, bearer_id);
507 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
508 b->media->send_msg(net, skb, b, dest);
509 else
510 kfree_skb(skb);
511 rcu_read_unlock();
512 }
513
514 /* tipc_bearer_xmit() -send buffer to destination over bearer
515 */
516 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
517 struct sk_buff_head *xmitq,
518 struct tipc_media_addr *dst)
519 {
520 struct tipc_bearer *b;
521 struct sk_buff *skb, *tmp;
522
523 if (skb_queue_empty(xmitq))
524 return;
525
526 rcu_read_lock();
527 b = bearer_get(net, bearer_id);
528 if (unlikely(!b))
529 __skb_queue_purge(xmitq);
530 skb_queue_walk_safe(xmitq, skb, tmp) {
531 __skb_dequeue(xmitq);
532 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
533 b->media->send_msg(net, skb, b, dst);
534 else
535 kfree_skb(skb);
536 }
537 rcu_read_unlock();
538 }
539
540 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
541 */
542 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
543 struct sk_buff_head *xmitq)
544 {
545 struct tipc_net *tn = tipc_net(net);
546 int net_id = tn->net_id;
547 struct tipc_bearer *b;
548 struct sk_buff *skb, *tmp;
549 struct tipc_msg *hdr;
550
551 rcu_read_lock();
552 b = bearer_get(net, bearer_id);
553 if (unlikely(!b || !test_bit(0, &b->up)))
554 __skb_queue_purge(xmitq);
555 skb_queue_walk_safe(xmitq, skb, tmp) {
556 hdr = buf_msg(skb);
557 msg_set_non_seq(hdr, 1);
558 msg_set_mc_netid(hdr, net_id);
559 __skb_dequeue(xmitq);
560 b->media->send_msg(net, skb, b, &b->bcast_addr);
561 }
562 rcu_read_unlock();
563 }
564
565 /**
566 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
567 * @buf: the received packet
568 * @dev: the net device that the packet was received on
569 * @pt: the packet_type structure which was used to register this handler
570 * @orig_dev: the original receive net device in case the device is a bond
571 *
572 * Accept only packets explicitly sent to this node, or broadcast packets;
573 * ignores packets sent using interface multicast, and traffic sent to other
574 * nodes (which can happen if interface is running in promiscuous mode).
575 */
576 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
577 struct packet_type *pt, struct net_device *orig_dev)
578 {
579 struct tipc_bearer *b;
580
581 rcu_read_lock();
582 b = rcu_dereference(dev->tipc_ptr) ?:
583 rcu_dereference(orig_dev->tipc_ptr);
584 if (likely(b && test_bit(0, &b->up) &&
585 (skb->pkt_type <= PACKET_MULTICAST))) {
586 skb_mark_not_on_list(skb);
587 tipc_rcv(dev_net(b->pt.dev), skb, b);
588 rcu_read_unlock();
589 return NET_RX_SUCCESS;
590 }
591 rcu_read_unlock();
592 kfree_skb(skb);
593 return NET_RX_DROP;
594 }
595
596 /**
597 * tipc_l2_device_event - handle device events from network device
598 * @nb: the context of the notification
599 * @evt: the type of event
600 * @ptr: the net device that the event was on
601 *
602 * This function is called by the Ethernet driver in case of link
603 * change event.
604 */
605 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
606 void *ptr)
607 {
608 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
609 struct net *net = dev_net(dev);
610 struct tipc_bearer *b;
611
612 b = rtnl_dereference(dev->tipc_ptr);
613 if (!b)
614 return NOTIFY_DONE;
615
616 trace_tipc_l2_device_event(dev, b, evt);
617 switch (evt) {
618 case NETDEV_CHANGE:
619 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
620 test_and_set_bit_lock(0, &b->up);
621 break;
622 }
623 /* fall through */
624 case NETDEV_GOING_DOWN:
625 clear_bit_unlock(0, &b->up);
626 tipc_reset_bearer(net, b);
627 break;
628 case NETDEV_UP:
629 test_and_set_bit_lock(0, &b->up);
630 break;
631 case NETDEV_CHANGEMTU:
632 if (tipc_mtu_bad(dev, 0)) {
633 bearer_disable(net, b);
634 break;
635 }
636 b->mtu = dev->mtu;
637 tipc_reset_bearer(net, b);
638 break;
639 case NETDEV_CHANGEADDR:
640 b->media->raw2addr(b, &b->addr,
641 (char *)dev->dev_addr);
642 tipc_reset_bearer(net, b);
643 break;
644 case NETDEV_UNREGISTER:
645 case NETDEV_CHANGENAME:
646 bearer_disable(net, b);
647 break;
648 }
649 return NOTIFY_OK;
650 }
651
652 static struct notifier_block notifier = {
653 .notifier_call = tipc_l2_device_event,
654 .priority = 0,
655 };
656
657 int tipc_bearer_setup(void)
658 {
659 return register_netdevice_notifier(&notifier);
660 }
661
662 void tipc_bearer_cleanup(void)
663 {
664 unregister_netdevice_notifier(&notifier);
665 }
666
667 void tipc_bearer_stop(struct net *net)
668 {
669 struct tipc_net *tn = net_generic(net, tipc_net_id);
670 struct tipc_bearer *b;
671 u32 i;
672
673 for (i = 0; i < MAX_BEARERS; i++) {
674 b = rtnl_dereference(tn->bearer_list[i]);
675 if (b) {
676 bearer_disable(net, b);
677 tn->bearer_list[i] = NULL;
678 }
679 }
680 }
681
682 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
683 {
684 struct net_device *dev = net->loopback_dev;
685 struct sk_buff *skb, *_skb;
686 int exp;
687
688 skb_queue_walk(pkts, _skb) {
689 skb = pskb_copy(_skb, GFP_ATOMIC);
690 if (!skb)
691 continue;
692
693 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
694 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
695 kfree_skb(skb);
696 continue;
697 }
698
699 skb_reset_network_header(skb);
700 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
701 dev->dev_addr, skb->len);
702 skb->dev = dev;
703 skb->pkt_type = PACKET_HOST;
704 skb->ip_summed = CHECKSUM_UNNECESSARY;
705 skb->protocol = eth_type_trans(skb, dev);
706 netif_rx_ni(skb);
707 }
708 }
709
710 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
711 struct packet_type *pt, struct net_device *od)
712 {
713 consume_skb(skb);
714 return NET_RX_SUCCESS;
715 }
716
717 int tipc_attach_loopback(struct net *net)
718 {
719 struct net_device *dev = net->loopback_dev;
720 struct tipc_net *tn = tipc_net(net);
721
722 if (!dev)
723 return -ENODEV;
724
725 dev_hold(dev);
726 tn->loopback_pt.dev = dev;
727 tn->loopback_pt.type = htons(ETH_P_TIPC);
728 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
729 dev_add_pack(&tn->loopback_pt);
730 return 0;
731 }
732
733 void tipc_detach_loopback(struct net *net)
734 {
735 struct tipc_net *tn = tipc_net(net);
736
737 dev_remove_pack(&tn->loopback_pt);
738 dev_put(net->loopback_dev);
739 }
740
741 /* Caller should hold rtnl_lock to protect the bearer */
742 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
743 struct tipc_bearer *bearer, int nlflags)
744 {
745 void *hdr;
746 struct nlattr *attrs;
747 struct nlattr *prop;
748
749 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
750 nlflags, TIPC_NL_BEARER_GET);
751 if (!hdr)
752 return -EMSGSIZE;
753
754 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
755 if (!attrs)
756 goto msg_full;
757
758 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
759 goto attr_msg_full;
760
761 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
762 if (!prop)
763 goto prop_msg_full;
764 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
765 goto prop_msg_full;
766 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
767 goto prop_msg_full;
768 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
769 goto prop_msg_full;
770 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
771 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
772 goto prop_msg_full;
773
774 nla_nest_end(msg->skb, prop);
775
776 #ifdef CONFIG_TIPC_MEDIA_UDP
777 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
778 if (tipc_udp_nl_add_bearer_data(msg, bearer))
779 goto attr_msg_full;
780 }
781 #endif
782
783 nla_nest_end(msg->skb, attrs);
784 genlmsg_end(msg->skb, hdr);
785
786 return 0;
787
788 prop_msg_full:
789 nla_nest_cancel(msg->skb, prop);
790 attr_msg_full:
791 nla_nest_cancel(msg->skb, attrs);
792 msg_full:
793 genlmsg_cancel(msg->skb, hdr);
794
795 return -EMSGSIZE;
796 }
797
798 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
799 {
800 int err;
801 int i = cb->args[0];
802 struct tipc_bearer *bearer;
803 struct tipc_nl_msg msg;
804 struct net *net = sock_net(skb->sk);
805 struct tipc_net *tn = net_generic(net, tipc_net_id);
806
807 if (i == MAX_BEARERS)
808 return 0;
809
810 msg.skb = skb;
811 msg.portid = NETLINK_CB(cb->skb).portid;
812 msg.seq = cb->nlh->nlmsg_seq;
813
814 rtnl_lock();
815 for (i = 0; i < MAX_BEARERS; i++) {
816 bearer = rtnl_dereference(tn->bearer_list[i]);
817 if (!bearer)
818 continue;
819
820 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
821 if (err)
822 break;
823 }
824 rtnl_unlock();
825
826 cb->args[0] = i;
827 return skb->len;
828 }
829
830 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
831 {
832 int err;
833 char *name;
834 struct sk_buff *rep;
835 struct tipc_bearer *bearer;
836 struct tipc_nl_msg msg;
837 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
838 struct net *net = genl_info_net(info);
839
840 if (!info->attrs[TIPC_NLA_BEARER])
841 return -EINVAL;
842
843 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
844 info->attrs[TIPC_NLA_BEARER],
845 tipc_nl_bearer_policy, info->extack);
846 if (err)
847 return err;
848
849 if (!attrs[TIPC_NLA_BEARER_NAME])
850 return -EINVAL;
851 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
852
853 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
854 if (!rep)
855 return -ENOMEM;
856
857 msg.skb = rep;
858 msg.portid = info->snd_portid;
859 msg.seq = info->snd_seq;
860
861 rtnl_lock();
862 bearer = tipc_bearer_find(net, name);
863 if (!bearer) {
864 err = -EINVAL;
865 goto err_out;
866 }
867
868 err = __tipc_nl_add_bearer(&msg, bearer, 0);
869 if (err)
870 goto err_out;
871 rtnl_unlock();
872
873 return genlmsg_reply(rep, info);
874 err_out:
875 rtnl_unlock();
876 nlmsg_free(rep);
877
878 return err;
879 }
880
881 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
882 {
883 int err;
884 char *name;
885 struct tipc_bearer *bearer;
886 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
887 struct net *net = sock_net(skb->sk);
888
889 if (!info->attrs[TIPC_NLA_BEARER])
890 return -EINVAL;
891
892 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
893 info->attrs[TIPC_NLA_BEARER],
894 tipc_nl_bearer_policy, info->extack);
895 if (err)
896 return err;
897
898 if (!attrs[TIPC_NLA_BEARER_NAME])
899 return -EINVAL;
900
901 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
902
903 bearer = tipc_bearer_find(net, name);
904 if (!bearer)
905 return -EINVAL;
906
907 bearer_disable(net, bearer);
908
909 return 0;
910 }
911
912 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
913 {
914 int err;
915
916 rtnl_lock();
917 err = __tipc_nl_bearer_disable(skb, info);
918 rtnl_unlock();
919
920 return err;
921 }
922
923 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
924 {
925 int err;
926 char *bearer;
927 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
928 struct net *net = sock_net(skb->sk);
929 u32 domain = 0;
930 u32 prio;
931
932 prio = TIPC_MEDIA_LINK_PRI;
933
934 if (!info->attrs[TIPC_NLA_BEARER])
935 return -EINVAL;
936
937 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
938 info->attrs[TIPC_NLA_BEARER],
939 tipc_nl_bearer_policy, info->extack);
940 if (err)
941 return err;
942
943 if (!attrs[TIPC_NLA_BEARER_NAME])
944 return -EINVAL;
945
946 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
947
948 if (attrs[TIPC_NLA_BEARER_DOMAIN])
949 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
950
951 if (attrs[TIPC_NLA_BEARER_PROP]) {
952 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
953
954 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
955 props);
956 if (err)
957 return err;
958
959 if (props[TIPC_NLA_PROP_PRIO])
960 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
961 }
962
963 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
964 }
965
966 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
967 {
968 int err;
969
970 rtnl_lock();
971 err = __tipc_nl_bearer_enable(skb, info);
972 rtnl_unlock();
973
974 return err;
975 }
976
977 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
978 {
979 int err;
980 char *name;
981 struct tipc_bearer *b;
982 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
983 struct net *net = sock_net(skb->sk);
984
985 if (!info->attrs[TIPC_NLA_BEARER])
986 return -EINVAL;
987
988 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
989 info->attrs[TIPC_NLA_BEARER],
990 tipc_nl_bearer_policy, info->extack);
991 if (err)
992 return err;
993
994 if (!attrs[TIPC_NLA_BEARER_NAME])
995 return -EINVAL;
996 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
997
998 rtnl_lock();
999 b = tipc_bearer_find(net, name);
1000 if (!b) {
1001 rtnl_unlock();
1002 return -EINVAL;
1003 }
1004
1005 #ifdef CONFIG_TIPC_MEDIA_UDP
1006 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1007 err = tipc_udp_nl_bearer_add(b,
1008 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1009 if (err) {
1010 rtnl_unlock();
1011 return err;
1012 }
1013 }
1014 #endif
1015 rtnl_unlock();
1016
1017 return 0;
1018 }
1019
1020 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1021 {
1022 struct tipc_bearer *b;
1023 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1024 struct net *net = sock_net(skb->sk);
1025 char *name;
1026 int err;
1027
1028 if (!info->attrs[TIPC_NLA_BEARER])
1029 return -EINVAL;
1030
1031 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1032 info->attrs[TIPC_NLA_BEARER],
1033 tipc_nl_bearer_policy, info->extack);
1034 if (err)
1035 return err;
1036
1037 if (!attrs[TIPC_NLA_BEARER_NAME])
1038 return -EINVAL;
1039 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1040
1041 b = tipc_bearer_find(net, name);
1042 if (!b)
1043 return -EINVAL;
1044
1045 if (attrs[TIPC_NLA_BEARER_PROP]) {
1046 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1047
1048 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1049 props);
1050 if (err)
1051 return err;
1052
1053 if (props[TIPC_NLA_PROP_TOL]) {
1054 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1055 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1056 }
1057 if (props[TIPC_NLA_PROP_PRIO])
1058 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1059 if (props[TIPC_NLA_PROP_WIN])
1060 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1061 if (props[TIPC_NLA_PROP_MTU]) {
1062 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1063 return -EINVAL;
1064 #ifdef CONFIG_TIPC_MEDIA_UDP
1065 if (tipc_udp_mtu_bad(nla_get_u32
1066 (props[TIPC_NLA_PROP_MTU])))
1067 return -EINVAL;
1068 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1069 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1070 #endif
1071 }
1072 }
1073
1074 return 0;
1075 }
1076
1077 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1078 {
1079 int err;
1080
1081 rtnl_lock();
1082 err = __tipc_nl_bearer_set(skb, info);
1083 rtnl_unlock();
1084
1085 return err;
1086 }
1087
1088 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1089 struct tipc_media *media, int nlflags)
1090 {
1091 void *hdr;
1092 struct nlattr *attrs;
1093 struct nlattr *prop;
1094
1095 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1096 nlflags, TIPC_NL_MEDIA_GET);
1097 if (!hdr)
1098 return -EMSGSIZE;
1099
1100 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1101 if (!attrs)
1102 goto msg_full;
1103
1104 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1105 goto attr_msg_full;
1106
1107 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1108 if (!prop)
1109 goto prop_msg_full;
1110 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1111 goto prop_msg_full;
1112 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1113 goto prop_msg_full;
1114 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1115 goto prop_msg_full;
1116 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1117 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1118 goto prop_msg_full;
1119
1120 nla_nest_end(msg->skb, prop);
1121 nla_nest_end(msg->skb, attrs);
1122 genlmsg_end(msg->skb, hdr);
1123
1124 return 0;
1125
1126 prop_msg_full:
1127 nla_nest_cancel(msg->skb, prop);
1128 attr_msg_full:
1129 nla_nest_cancel(msg->skb, attrs);
1130 msg_full:
1131 genlmsg_cancel(msg->skb, hdr);
1132
1133 return -EMSGSIZE;
1134 }
1135
1136 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1137 {
1138 int err;
1139 int i = cb->args[0];
1140 struct tipc_nl_msg msg;
1141
1142 if (i == MAX_MEDIA)
1143 return 0;
1144
1145 msg.skb = skb;
1146 msg.portid = NETLINK_CB(cb->skb).portid;
1147 msg.seq = cb->nlh->nlmsg_seq;
1148
1149 rtnl_lock();
1150 for (; media_info_array[i] != NULL; i++) {
1151 err = __tipc_nl_add_media(&msg, media_info_array[i],
1152 NLM_F_MULTI);
1153 if (err)
1154 break;
1155 }
1156 rtnl_unlock();
1157
1158 cb->args[0] = i;
1159 return skb->len;
1160 }
1161
1162 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1163 {
1164 int err;
1165 char *name;
1166 struct tipc_nl_msg msg;
1167 struct tipc_media *media;
1168 struct sk_buff *rep;
1169 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1170
1171 if (!info->attrs[TIPC_NLA_MEDIA])
1172 return -EINVAL;
1173
1174 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1175 info->attrs[TIPC_NLA_MEDIA],
1176 tipc_nl_media_policy, info->extack);
1177 if (err)
1178 return err;
1179
1180 if (!attrs[TIPC_NLA_MEDIA_NAME])
1181 return -EINVAL;
1182 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1183
1184 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1185 if (!rep)
1186 return -ENOMEM;
1187
1188 msg.skb = rep;
1189 msg.portid = info->snd_portid;
1190 msg.seq = info->snd_seq;
1191
1192 rtnl_lock();
1193 media = tipc_media_find(name);
1194 if (!media) {
1195 err = -EINVAL;
1196 goto err_out;
1197 }
1198
1199 err = __tipc_nl_add_media(&msg, media, 0);
1200 if (err)
1201 goto err_out;
1202 rtnl_unlock();
1203
1204 return genlmsg_reply(rep, info);
1205 err_out:
1206 rtnl_unlock();
1207 nlmsg_free(rep);
1208
1209 return err;
1210 }
1211
1212 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1213 {
1214 int err;
1215 char *name;
1216 struct tipc_media *m;
1217 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1218
1219 if (!info->attrs[TIPC_NLA_MEDIA])
1220 return -EINVAL;
1221
1222 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1223 info->attrs[TIPC_NLA_MEDIA],
1224 tipc_nl_media_policy, info->extack);
1225
1226 if (!attrs[TIPC_NLA_MEDIA_NAME])
1227 return -EINVAL;
1228 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1229
1230 m = tipc_media_find(name);
1231 if (!m)
1232 return -EINVAL;
1233
1234 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1235 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1236
1237 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1238 props);
1239 if (err)
1240 return err;
1241
1242 if (props[TIPC_NLA_PROP_TOL])
1243 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1244 if (props[TIPC_NLA_PROP_PRIO])
1245 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1246 if (props[TIPC_NLA_PROP_WIN])
1247 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1248 if (props[TIPC_NLA_PROP_MTU]) {
1249 if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1250 return -EINVAL;
1251 #ifdef CONFIG_TIPC_MEDIA_UDP
1252 if (tipc_udp_mtu_bad(nla_get_u32
1253 (props[TIPC_NLA_PROP_MTU])))
1254 return -EINVAL;
1255 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1256 #endif
1257 }
1258 }
1259
1260 return 0;
1261 }
1262
1263 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1264 {
1265 int err;
1266
1267 rtnl_lock();
1268 err = __tipc_nl_media_set(skb, info);
1269 rtnl_unlock();
1270
1271 return err;
1272 }
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