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signal: Fix sending signals with siginfo
[cris-mirror.git] / net / tipc / bearer.c
blobd174ee3254eecb523dbc86061d80a1e812dcc305
1 /*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include <net/sock.h>
38 #include "core.h"
39 #include "bearer.h"
40 #include "link.h"
41 #include "discover.h"
42 #include "monitor.h"
43 #include "bcast.h"
44 #include "netlink.h"
45 #include "udp_media.h"
46
47 #define MAX_ADDR_STR 60
48
49 static struct tipc_media * const media_info_array[] = {
50 &eth_media_info,
51 #ifdef CONFIG_TIPC_MEDIA_IB
52 &ib_media_info,
53 #endif
54 #ifdef CONFIG_TIPC_MEDIA_UDP
55 &udp_media_info,
56 #endif
57 NULL
58 };
59
60 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
61 {
62 struct tipc_net *tn = tipc_net(net);
63
64 return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
65 }
66
67 static void bearer_disable(struct net *net, struct tipc_bearer *b);
68
69 /**
70 * tipc_media_find - locates specified media object by name
71 */
72 struct tipc_media *tipc_media_find(const char *name)
73 {
74 u32 i;
75
76 for (i = 0; media_info_array[i] != NULL; i++) {
77 if (!strcmp(media_info_array[i]->name, name))
78 break;
79 }
80 return media_info_array[i];
81 }
82
83 /**
84 * media_find_id - locates specified media object by type identifier
85 */
86 static struct tipc_media *media_find_id(u8 type)
87 {
88 u32 i;
89
90 for (i = 0; media_info_array[i] != NULL; i++) {
91 if (media_info_array[i]->type_id == type)
92 break;
93 }
94 return media_info_array[i];
95 }
96
97 /**
98 * tipc_media_addr_printf - record media address in print buffer
99 */
100 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
101 {
102 char addr_str[MAX_ADDR_STR];
103 struct tipc_media *m;
104 int ret;
105
106 m = media_find_id(a->media_id);
107
108 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
109 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
110 else {
111 u32 i;
112
113 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
114 for (i = 0; i < sizeof(a->value); i++)
115 ret += scnprintf(buf - ret, len + ret,
116 "-%02x", a->value[i]);
117 }
118 }
119
120 /**
121 * bearer_name_validate - validate & (optionally) deconstruct bearer name
122 * @name: ptr to bearer name string
123 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
124 *
125 * Returns 1 if bearer name is valid, otherwise 0.
126 */
127 static int bearer_name_validate(const char *name,
128 struct tipc_bearer_names *name_parts)
129 {
130 char name_copy[TIPC_MAX_BEARER_NAME];
131 char *media_name;
132 char *if_name;
133 u32 media_len;
134 u32 if_len;
135
136 /* copy bearer name & ensure length is OK */
137 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
138 /* need above in case non-Posix strncpy() doesn't pad with nulls */
139 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
140 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
141 return 0;
142
143 /* ensure all component parts of bearer name are present */
144 media_name = name_copy;
145 if_name = strchr(media_name, ':');
146 if (if_name == NULL)
147 return 0;
148 *(if_name++) = 0;
149 media_len = if_name - media_name;
150 if_len = strlen(if_name) + 1;
151
152 /* validate component parts of bearer name */
153 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
154 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
155 return 0;
156
157 /* return bearer name components, if necessary */
158 if (name_parts) {
159 strcpy(name_parts->media_name, media_name);
160 strcpy(name_parts->if_name, if_name);
161 }
162 return 1;
163 }
164
165 /**
166 * tipc_bearer_find - locates bearer object with matching bearer name
167 */
168 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
169 {
170 struct tipc_net *tn = net_generic(net, tipc_net_id);
171 struct tipc_bearer *b;
172 u32 i;
173
174 for (i = 0; i < MAX_BEARERS; i++) {
175 b = rtnl_dereference(tn->bearer_list[i]);
176 if (b && (!strcmp(b->name, name)))
177 return b;
178 }
179 return NULL;
180 }
181
182 /* tipc_bearer_get_name - get the bearer name from its id.
183 * @net: network namespace
184 * @name: a pointer to the buffer where the name will be stored.
185 * @bearer_id: the id to get the name from.
186 */
187 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
188 {
189 struct tipc_net *tn = tipc_net(net);
190 struct tipc_bearer *b;
191
192 if (bearer_id >= MAX_BEARERS)
193 return -EINVAL;
194
195 b = rtnl_dereference(tn->bearer_list[bearer_id]);
196 if (!b)
197 return -EINVAL;
198
199 strcpy(name, b->name);
200 return 0;
201 }
202
203 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
204 {
205 struct tipc_net *tn = net_generic(net, tipc_net_id);
206 struct tipc_bearer *b;
207
208 rcu_read_lock();
209 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
210 if (b)
211 tipc_disc_add_dest(b->link_req);
212 rcu_read_unlock();
213 }
214
215 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
216 {
217 struct tipc_net *tn = net_generic(net, tipc_net_id);
218 struct tipc_bearer *b;
219
220 rcu_read_lock();
221 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
222 if (b)
223 tipc_disc_remove_dest(b->link_req);
224 rcu_read_unlock();
225 }
226
227 /**
228 * tipc_enable_bearer - enable bearer with the given name
229 */
230 static int tipc_enable_bearer(struct net *net, const char *name,
231 u32 disc_domain, u32 priority,
232 struct nlattr *attr[])
233 {
234 struct tipc_net *tn = net_generic(net, tipc_net_id);
235 struct tipc_bearer *b;
236 struct tipc_media *m;
237 struct tipc_bearer_names b_names;
238 struct sk_buff *skb;
239 char addr_string[16];
240 u32 bearer_id;
241 u32 with_this_prio;
242 u32 i;
243 int res = -EINVAL;
244
245 if (!tn->own_addr) {
246 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
247 name);
248 return -ENOPROTOOPT;
249 }
250 if (!bearer_name_validate(name, &b_names)) {
251 pr_warn("Bearer <%s> rejected, illegal name\n", name);
252 return -EINVAL;
253 }
254 if (tipc_addr_domain_valid(disc_domain) &&
255 (disc_domain != tn->own_addr)) {
256 if (tipc_in_scope(disc_domain, tn->own_addr)) {
257 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
258 res = 0; /* accept any node in own cluster */
259 } else if (in_own_cluster_exact(net, disc_domain))
260 res = 0; /* accept specified node in own cluster */
261 }
262 if (res) {
263 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
264 name);
265 return -EINVAL;
266 }
267 if ((priority > TIPC_MAX_LINK_PRI) &&
268 (priority != TIPC_MEDIA_LINK_PRI)) {
269 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
270 return -EINVAL;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
276 name, b_names.media_name);
277 return -EINVAL;
278 }
279
280 if (priority == TIPC_MEDIA_LINK_PRI)
281 priority = m->priority;
282
283 restart:
284 bearer_id = MAX_BEARERS;
285 with_this_prio = 1;
286 for (i = MAX_BEARERS; i-- != 0; ) {
287 b = rtnl_dereference(tn->bearer_list[i]);
288 if (!b) {
289 bearer_id = i;
290 continue;
291 }
292 if (!strcmp(name, b->name)) {
293 pr_warn("Bearer <%s> rejected, already enabled\n",
294 name);
295 return -EINVAL;
296 }
297 if ((b->priority == priority) &&
298 (++with_this_prio > 2)) {
299 if (priority-- == 0) {
300 pr_warn("Bearer <%s> rejected, duplicate priority\n",
301 name);
302 return -EINVAL;
303 }
304 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
305 name, priority + 1, priority);
306 goto restart;
307 }
308 }
309 if (bearer_id >= MAX_BEARERS) {
310 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
311 name, MAX_BEARERS);
312 return -EINVAL;
313 }
314
315 b = kzalloc(sizeof(*b), GFP_ATOMIC);
316 if (!b)
317 return -ENOMEM;
318
319 strcpy(b->name, name);
320 b->media = m;
321 res = m->enable_media(net, b, attr);
322 if (res) {
323 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
324 name, -res);
325 return -EINVAL;
326 }
327
328 b->identity = bearer_id;
329 b->tolerance = m->tolerance;
330 b->window = m->window;
331 b->domain = disc_domain;
332 b->net_plane = bearer_id + 'A';
333 b->priority = priority;
334 test_and_set_bit_lock(0, &b->up);
335
336 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
337 if (res) {
338 bearer_disable(net, b);
339 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
340 name);
341 return -EINVAL;
342 }
343
344 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
345 if (skb)
346 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
347
348 if (tipc_mon_create(net, bearer_id))
349 return -ENOMEM;
350
351 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
352 name,
353 tipc_addr_string_fill(addr_string, disc_domain), priority);
354 return res;
355 }
356
357 /**
358 * tipc_reset_bearer - Reset all links established over this bearer
359 */
360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
361 {
362 pr_info("Resetting bearer <%s>\n", b->name);
363 tipc_node_delete_links(net, b->identity);
364 tipc_disc_reset(net, b);
365 return 0;
366 }
367
368 /* tipc_bearer_reset_all - reset all links on all bearers
369 */
370 void tipc_bearer_reset_all(struct net *net)
371 {
372 struct tipc_bearer *b;
373 int i;
374
375 for (i = 0; i < MAX_BEARERS; i++) {
376 b = bearer_get(net, i);
377 if (b)
378 clear_bit_unlock(0, &b->up);
379 }
380 for (i = 0; i < MAX_BEARERS; i++) {
381 b = bearer_get(net, i);
382 if (b)
383 tipc_reset_bearer(net, b);
384 }
385 for (i = 0; i < MAX_BEARERS; i++) {
386 b = bearer_get(net, i);
387 if (b)
388 test_and_set_bit_lock(0, &b->up);
389 }
390 }
391
392 /**
393 * bearer_disable
394 *
395 * Note: This routine assumes caller holds RTNL lock.
396 */
397 static void bearer_disable(struct net *net, struct tipc_bearer *b)
398 {
399 struct tipc_net *tn = tipc_net(net);
400 int bearer_id = b->identity;
401
402 pr_info("Disabling bearer <%s>\n", b->name);
403 clear_bit_unlock(0, &b->up);
404 tipc_node_delete_links(net, bearer_id);
405 b->media->disable_media(b);
406 RCU_INIT_POINTER(b->media_ptr, NULL);
407 if (b->link_req)
408 tipc_disc_delete(b->link_req);
409 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
410 kfree_rcu(b, rcu);
411 tipc_mon_delete(net, bearer_id);
412 }
413
414 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
415 struct nlattr *attr[])
416 {
417 struct net_device *dev;
418 char *driver_name = strchr((const char *)b->name, ':') + 1;
419
420 /* Find device with specified name */
421 dev = dev_get_by_name(net, driver_name);
422 if (!dev)
423 return -ENODEV;
424 if (tipc_mtu_bad(dev, 0)) {
425 dev_put(dev);
426 return -EINVAL;
427 }
428
429 /* Associate TIPC bearer with L2 bearer */
430 rcu_assign_pointer(b->media_ptr, dev);
431 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
432 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
433 b->bcast_addr.media_id = b->media->type_id;
434 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
435 b->mtu = dev->mtu;
436 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
437 rcu_assign_pointer(dev->tipc_ptr, b);
438 return 0;
439 }
440
441 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
442 *
443 * Mark L2 bearer as inactive so that incoming buffers are thrown away
444 */
445 void tipc_disable_l2_media(struct tipc_bearer *b)
446 {
447 struct net_device *dev;
448
449 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
450 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
451 synchronize_net();
452 dev_put(dev);
453 }
454
455 /**
456 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
457 * @skb: the packet to be sent
458 * @b: the bearer through which the packet is to be sent
459 * @dest: peer destination address
460 */
461 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
462 struct tipc_bearer *b, struct tipc_media_addr *dest)
463 {
464 struct net_device *dev;
465 int delta;
466
467 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
468 if (!dev)
469 return 0;
470
471 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
472 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
473 kfree_skb(skb);
474 return 0;
475 }
476 skb_reset_network_header(skb);
477 skb->dev = dev;
478 skb->protocol = htons(ETH_P_TIPC);
479 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
480 dev->dev_addr, skb->len);
481 dev_queue_xmit(skb);
482 return 0;
483 }
484
485 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
486 {
487 bool supp = false;
488 struct tipc_bearer *b;
489
490 rcu_read_lock();
491 b = bearer_get(net, bearer_id);
492 if (b)
493 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
494 rcu_read_unlock();
495 return supp;
496 }
497
498 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
499 {
500 int mtu = 0;
501 struct tipc_bearer *b;
502
503 rcu_read_lock();
504 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
505 if (b)
506 mtu = b->mtu;
507 rcu_read_unlock();
508 return mtu;
509 }
510
511 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
512 */
513 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
514 struct sk_buff *skb,
515 struct tipc_media_addr *dest)
516 {
517 struct tipc_msg *hdr = buf_msg(skb);
518 struct tipc_bearer *b;
519
520 rcu_read_lock();
521 b = bearer_get(net, bearer_id);
522 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
523 b->media->send_msg(net, skb, b, dest);
524 else
525 kfree_skb(skb);
526 rcu_read_unlock();
527 }
528
529 /* tipc_bearer_xmit() -send buffer to destination over bearer
530 */
531 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
532 struct sk_buff_head *xmitq,
533 struct tipc_media_addr *dst)
534 {
535 struct tipc_bearer *b;
536 struct sk_buff *skb, *tmp;
537
538 if (skb_queue_empty(xmitq))
539 return;
540
541 rcu_read_lock();
542 b = bearer_get(net, bearer_id);
543 if (unlikely(!b))
544 __skb_queue_purge(xmitq);
545 skb_queue_walk_safe(xmitq, skb, tmp) {
546 __skb_dequeue(xmitq);
547 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
548 b->media->send_msg(net, skb, b, dst);
549 else
550 kfree_skb(skb);
551 }
552 rcu_read_unlock();
553 }
554
555 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
556 */
557 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
558 struct sk_buff_head *xmitq)
559 {
560 struct tipc_net *tn = tipc_net(net);
561 int net_id = tn->net_id;
562 struct tipc_bearer *b;
563 struct sk_buff *skb, *tmp;
564 struct tipc_msg *hdr;
565
566 rcu_read_lock();
567 b = bearer_get(net, bearer_id);
568 if (unlikely(!b || !test_bit(0, &b->up)))
569 __skb_queue_purge(xmitq);
570 skb_queue_walk_safe(xmitq, skb, tmp) {
571 hdr = buf_msg(skb);
572 msg_set_non_seq(hdr, 1);
573 msg_set_mc_netid(hdr, net_id);
574 __skb_dequeue(xmitq);
575 b->media->send_msg(net, skb, b, &b->bcast_addr);
576 }
577 rcu_read_unlock();
578 }
579
580 /**
581 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
582 * @buf: the received packet
583 * @dev: the net device that the packet was received on
584 * @pt: the packet_type structure which was used to register this handler
585 * @orig_dev: the original receive net device in case the device is a bond
586 *
587 * Accept only packets explicitly sent to this node, or broadcast packets;
588 * ignores packets sent using interface multicast, and traffic sent to other
589 * nodes (which can happen if interface is running in promiscuous mode).
590 */
591 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
592 struct packet_type *pt, struct net_device *orig_dev)
593 {
594 struct tipc_bearer *b;
595
596 rcu_read_lock();
597 b = rcu_dereference_rtnl(dev->tipc_ptr);
598 if (likely(b && test_bit(0, &b->up) &&
599 (skb->pkt_type <= PACKET_BROADCAST))) {
600 skb->next = NULL;
601 tipc_rcv(dev_net(dev), skb, b);
602 rcu_read_unlock();
603 return NET_RX_SUCCESS;
604 }
605 rcu_read_unlock();
606 kfree_skb(skb);
607 return NET_RX_DROP;
608 }
609
610 /**
611 * tipc_l2_device_event - handle device events from network device
612 * @nb: the context of the notification
613 * @evt: the type of event
614 * @ptr: the net device that the event was on
615 *
616 * This function is called by the Ethernet driver in case of link
617 * change event.
618 */
619 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
620 void *ptr)
621 {
622 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
623 struct net *net = dev_net(dev);
624 struct tipc_bearer *b;
625
626 b = rtnl_dereference(dev->tipc_ptr);
627 if (!b)
628 return NOTIFY_DONE;
629
630 switch (evt) {
631 case NETDEV_CHANGE:
632 if (netif_carrier_ok(dev))
633 break;
634 case NETDEV_UP:
635 test_and_set_bit_lock(0, &b->up);
636 break;
637 case NETDEV_GOING_DOWN:
638 clear_bit_unlock(0, &b->up);
639 tipc_reset_bearer(net, b);
640 break;
641 case NETDEV_CHANGEMTU:
642 if (tipc_mtu_bad(dev, 0)) {
643 bearer_disable(net, b);
644 break;
645 }
646 b->mtu = dev->mtu;
647 tipc_reset_bearer(net, b);
648 break;
649 case NETDEV_CHANGEADDR:
650 b->media->raw2addr(b, &b->addr,
651 (char *)dev->dev_addr);
652 tipc_reset_bearer(net, b);
653 break;
654 case NETDEV_UNREGISTER:
655 case NETDEV_CHANGENAME:
656 bearer_disable(dev_net(dev), b);
657 break;
658 }
659 return NOTIFY_OK;
660 }
661
662 static struct packet_type tipc_packet_type __read_mostly = {
663 .type = htons(ETH_P_TIPC),
664 .func = tipc_l2_rcv_msg,
665 };
666
667 static struct notifier_block notifier = {
668 .notifier_call = tipc_l2_device_event,
669 .priority = 0,
670 };
671
672 int tipc_bearer_setup(void)
673 {
674 int err;
675
676 err = register_netdevice_notifier(&notifier);
677 if (err)
678 return err;
679 dev_add_pack(&tipc_packet_type);
680 return 0;
681 }
682
683 void tipc_bearer_cleanup(void)
684 {
685 unregister_netdevice_notifier(&notifier);
686 dev_remove_pack(&tipc_packet_type);
687 }
688
689 void tipc_bearer_stop(struct net *net)
690 {
691 struct tipc_net *tn = net_generic(net, tipc_net_id);
692 struct tipc_bearer *b;
693 u32 i;
694
695 for (i = 0; i < MAX_BEARERS; i++) {
696 b = rtnl_dereference(tn->bearer_list[i]);
697 if (b) {
698 bearer_disable(net, b);
699 tn->bearer_list[i] = NULL;
700 }
701 }
702 }
703
704 /* Caller should hold rtnl_lock to protect the bearer */
705 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
706 struct tipc_bearer *bearer, int nlflags)
707 {
708 void *hdr;
709 struct nlattr *attrs;
710 struct nlattr *prop;
711
712 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
713 nlflags, TIPC_NL_BEARER_GET);
714 if (!hdr)
715 return -EMSGSIZE;
716
717 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
718 if (!attrs)
719 goto msg_full;
720
721 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
722 goto attr_msg_full;
723
724 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
725 if (!prop)
726 goto prop_msg_full;
727 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
728 goto prop_msg_full;
729 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
730 goto prop_msg_full;
731 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
732 goto prop_msg_full;
733
734 nla_nest_end(msg->skb, prop);
735
736 #ifdef CONFIG_TIPC_MEDIA_UDP
737 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
738 if (tipc_udp_nl_add_bearer_data(msg, bearer))
739 goto attr_msg_full;
740 }
741 #endif
742
743 nla_nest_end(msg->skb, attrs);
744 genlmsg_end(msg->skb, hdr);
745
746 return 0;
747
748 prop_msg_full:
749 nla_nest_cancel(msg->skb, prop);
750 attr_msg_full:
751 nla_nest_cancel(msg->skb, attrs);
752 msg_full:
753 genlmsg_cancel(msg->skb, hdr);
754
755 return -EMSGSIZE;
756 }
757
758 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
759 {
760 int err;
761 int i = cb->args[0];
762 struct tipc_bearer *bearer;
763 struct tipc_nl_msg msg;
764 struct net *net = sock_net(skb->sk);
765 struct tipc_net *tn = net_generic(net, tipc_net_id);
766
767 if (i == MAX_BEARERS)
768 return 0;
769
770 msg.skb = skb;
771 msg.portid = NETLINK_CB(cb->skb).portid;
772 msg.seq = cb->nlh->nlmsg_seq;
773
774 rtnl_lock();
775 for (i = 0; i < MAX_BEARERS; i++) {
776 bearer = rtnl_dereference(tn->bearer_list[i]);
777 if (!bearer)
778 continue;
779
780 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
781 if (err)
782 break;
783 }
784 rtnl_unlock();
785
786 cb->args[0] = i;
787 return skb->len;
788 }
789
790 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
791 {
792 int err;
793 char *name;
794 struct sk_buff *rep;
795 struct tipc_bearer *bearer;
796 struct tipc_nl_msg msg;
797 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
798 struct net *net = genl_info_net(info);
799
800 if (!info->attrs[TIPC_NLA_BEARER])
801 return -EINVAL;
802
803 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
804 info->attrs[TIPC_NLA_BEARER],
805 tipc_nl_bearer_policy, info->extack);
806 if (err)
807 return err;
808
809 if (!attrs[TIPC_NLA_BEARER_NAME])
810 return -EINVAL;
811 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
812
813 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
814 if (!rep)
815 return -ENOMEM;
816
817 msg.skb = rep;
818 msg.portid = info->snd_portid;
819 msg.seq = info->snd_seq;
820
821 rtnl_lock();
822 bearer = tipc_bearer_find(net, name);
823 if (!bearer) {
824 err = -EINVAL;
825 goto err_out;
826 }
827
828 err = __tipc_nl_add_bearer(&msg, bearer, 0);
829 if (err)
830 goto err_out;
831 rtnl_unlock();
832
833 return genlmsg_reply(rep, info);
834 err_out:
835 rtnl_unlock();
836 nlmsg_free(rep);
837
838 return err;
839 }
840
841 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
842 {
843 int err;
844 char *name;
845 struct tipc_bearer *bearer;
846 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
847 struct net *net = sock_net(skb->sk);
848
849 if (!info->attrs[TIPC_NLA_BEARER])
850 return -EINVAL;
851
852 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
853 info->attrs[TIPC_NLA_BEARER],
854 tipc_nl_bearer_policy, info->extack);
855 if (err)
856 return err;
857
858 if (!attrs[TIPC_NLA_BEARER_NAME])
859 return -EINVAL;
860
861 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
862
863 rtnl_lock();
864 bearer = tipc_bearer_find(net, name);
865 if (!bearer) {
866 rtnl_unlock();
867 return -EINVAL;
868 }
869
870 bearer_disable(net, bearer);
871 rtnl_unlock();
872
873 return 0;
874 }
875
876 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
877 {
878 int err;
879 char *bearer;
880 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
881 struct net *net = sock_net(skb->sk);
882 struct tipc_net *tn = net_generic(net, tipc_net_id);
883 u32 domain;
884 u32 prio;
885
886 prio = TIPC_MEDIA_LINK_PRI;
887 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
888
889 if (!info->attrs[TIPC_NLA_BEARER])
890 return -EINVAL;
891
892 err = nla_parse_nested(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 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
902
903 if (attrs[TIPC_NLA_BEARER_DOMAIN])
904 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
905
906 if (attrs[TIPC_NLA_BEARER_PROP]) {
907 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
908
909 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
910 props);
911 if (err)
912 return err;
913
914 if (props[TIPC_NLA_PROP_PRIO])
915 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
916 }
917
918 rtnl_lock();
919 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
920 if (err) {
921 rtnl_unlock();
922 return err;
923 }
924 rtnl_unlock();
925
926 return 0;
927 }
928
929 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
930 {
931 int err;
932 char *name;
933 struct tipc_bearer *b;
934 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
935 struct net *net = sock_net(skb->sk);
936
937 if (!info->attrs[TIPC_NLA_BEARER])
938 return -EINVAL;
939
940 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
941 info->attrs[TIPC_NLA_BEARER],
942 tipc_nl_bearer_policy, info->extack);
943 if (err)
944 return err;
945
946 if (!attrs[TIPC_NLA_BEARER_NAME])
947 return -EINVAL;
948 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
949
950 rtnl_lock();
951 b = tipc_bearer_find(net, name);
952 if (!b) {
953 rtnl_unlock();
954 return -EINVAL;
955 }
956
957 #ifdef CONFIG_TIPC_MEDIA_UDP
958 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
959 err = tipc_udp_nl_bearer_add(b,
960 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
961 if (err) {
962 rtnl_unlock();
963 return err;
964 }
965 }
966 #endif
967 rtnl_unlock();
968
969 return 0;
970 }
971
972 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
973 {
974 int err;
975 char *name;
976 struct tipc_bearer *b;
977 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
978 struct net *net = sock_net(skb->sk);
979
980 if (!info->attrs[TIPC_NLA_BEARER])
981 return -EINVAL;
982
983 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
984 info->attrs[TIPC_NLA_BEARER],
985 tipc_nl_bearer_policy, info->extack);
986 if (err)
987 return err;
988
989 if (!attrs[TIPC_NLA_BEARER_NAME])
990 return -EINVAL;
991 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
992
993 rtnl_lock();
994 b = tipc_bearer_find(net, name);
995 if (!b) {
996 rtnl_unlock();
997 return -EINVAL;
998 }
999
1000 if (attrs[TIPC_NLA_BEARER_PROP]) {
1001 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1002
1003 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1004 props);
1005 if (err) {
1006 rtnl_unlock();
1007 return err;
1008 }
1009
1010 if (props[TIPC_NLA_PROP_TOL])
1011 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1012 if (props[TIPC_NLA_PROP_PRIO])
1013 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1014 if (props[TIPC_NLA_PROP_WIN])
1015 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1016 }
1017 rtnl_unlock();
1018
1019 return 0;
1020 }
1021
1022 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1023 struct tipc_media *media, int nlflags)
1024 {
1025 void *hdr;
1026 struct nlattr *attrs;
1027 struct nlattr *prop;
1028
1029 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1030 nlflags, TIPC_NL_MEDIA_GET);
1031 if (!hdr)
1032 return -EMSGSIZE;
1033
1034 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1035 if (!attrs)
1036 goto msg_full;
1037
1038 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1039 goto attr_msg_full;
1040
1041 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1042 if (!prop)
1043 goto prop_msg_full;
1044 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1045 goto prop_msg_full;
1046 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1047 goto prop_msg_full;
1048 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1049 goto prop_msg_full;
1050
1051 nla_nest_end(msg->skb, prop);
1052 nla_nest_end(msg->skb, attrs);
1053 genlmsg_end(msg->skb, hdr);
1054
1055 return 0;
1056
1057 prop_msg_full:
1058 nla_nest_cancel(msg->skb, prop);
1059 attr_msg_full:
1060 nla_nest_cancel(msg->skb, attrs);
1061 msg_full:
1062 genlmsg_cancel(msg->skb, hdr);
1063
1064 return -EMSGSIZE;
1065 }
1066
1067 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1068 {
1069 int err;
1070 int i = cb->args[0];
1071 struct tipc_nl_msg msg;
1072
1073 if (i == MAX_MEDIA)
1074 return 0;
1075
1076 msg.skb = skb;
1077 msg.portid = NETLINK_CB(cb->skb).portid;
1078 msg.seq = cb->nlh->nlmsg_seq;
1079
1080 rtnl_lock();
1081 for (; media_info_array[i] != NULL; i++) {
1082 err = __tipc_nl_add_media(&msg, media_info_array[i],
1083 NLM_F_MULTI);
1084 if (err)
1085 break;
1086 }
1087 rtnl_unlock();
1088
1089 cb->args[0] = i;
1090 return skb->len;
1091 }
1092
1093 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1094 {
1095 int err;
1096 char *name;
1097 struct tipc_nl_msg msg;
1098 struct tipc_media *media;
1099 struct sk_buff *rep;
1100 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1101
1102 if (!info->attrs[TIPC_NLA_MEDIA])
1103 return -EINVAL;
1104
1105 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1106 info->attrs[TIPC_NLA_MEDIA],
1107 tipc_nl_media_policy, info->extack);
1108 if (err)
1109 return err;
1110
1111 if (!attrs[TIPC_NLA_MEDIA_NAME])
1112 return -EINVAL;
1113 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1114
1115 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1116 if (!rep)
1117 return -ENOMEM;
1118
1119 msg.skb = rep;
1120 msg.portid = info->snd_portid;
1121 msg.seq = info->snd_seq;
1122
1123 rtnl_lock();
1124 media = tipc_media_find(name);
1125 if (!media) {
1126 err = -EINVAL;
1127 goto err_out;
1128 }
1129
1130 err = __tipc_nl_add_media(&msg, media, 0);
1131 if (err)
1132 goto err_out;
1133 rtnl_unlock();
1134
1135 return genlmsg_reply(rep, info);
1136 err_out:
1137 rtnl_unlock();
1138 nlmsg_free(rep);
1139
1140 return err;
1141 }
1142
1143 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1144 {
1145 int err;
1146 char *name;
1147 struct tipc_media *m;
1148 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1149
1150 if (!info->attrs[TIPC_NLA_MEDIA])
1151 return -EINVAL;
1152
1153 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1154 info->attrs[TIPC_NLA_MEDIA],
1155 tipc_nl_media_policy, info->extack);
1156
1157 if (!attrs[TIPC_NLA_MEDIA_NAME])
1158 return -EINVAL;
1159 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1160
1161 rtnl_lock();
1162 m = tipc_media_find(name);
1163 if (!m) {
1164 rtnl_unlock();
1165 return -EINVAL;
1166 }
1167
1168 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1169 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1170
1171 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1172 props);
1173 if (err) {
1174 rtnl_unlock();
1175 return err;
1176 }
1177
1178 if (props[TIPC_NLA_PROP_TOL])
1179 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1180 if (props[TIPC_NLA_PROP_PRIO])
1181 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1182 if (props[TIPC_NLA_PROP_WIN])
1183 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1184 }
1185 rtnl_unlock();
1186
1187 return 0;
1188 }
CRIS linux kernel tree