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Linux 4.13.16
[linux/fpc-iii.git] / net / tipc / bearer.c
blob89cd061c4468247cf761541ff1a2ca27f0836d6f
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 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
69 struct packet_type *pt, struct net_device *orig_dev);
70
71 /**
72 * tipc_media_find - locates specified media object by name
73 */
74 struct tipc_media *tipc_media_find(const char *name)
75 {
76 u32 i;
77
78 for (i = 0; media_info_array[i] != NULL; i++) {
79 if (!strcmp(media_info_array[i]->name, name))
80 break;
81 }
82 return media_info_array[i];
83 }
84
85 /**
86 * media_find_id - locates specified media object by type identifier
87 */
88 static struct tipc_media *media_find_id(u8 type)
89 {
90 u32 i;
91
92 for (i = 0; media_info_array[i] != NULL; i++) {
93 if (media_info_array[i]->type_id == type)
94 break;
95 }
96 return media_info_array[i];
97 }
98
99 /**
100 * tipc_media_addr_printf - record media address in print buffer
101 */
102 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
103 {
104 char addr_str[MAX_ADDR_STR];
105 struct tipc_media *m;
106 int ret;
107
108 m = media_find_id(a->media_id);
109
110 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
111 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
112 else {
113 u32 i;
114
115 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
116 for (i = 0; i < sizeof(a->value); i++)
117 ret += scnprintf(buf - ret, len + ret,
118 "-%02x", a->value[i]);
119 }
120 }
121
122 /**
123 * bearer_name_validate - validate & (optionally) deconstruct bearer name
124 * @name: ptr to bearer name string
125 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
126 *
127 * Returns 1 if bearer name is valid, otherwise 0.
128 */
129 static int bearer_name_validate(const char *name,
130 struct tipc_bearer_names *name_parts)
131 {
132 char name_copy[TIPC_MAX_BEARER_NAME];
133 char *media_name;
134 char *if_name;
135 u32 media_len;
136 u32 if_len;
137
138 /* copy bearer name & ensure length is OK */
139 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
140 /* need above in case non-Posix strncpy() doesn't pad with nulls */
141 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
142 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
143 return 0;
144
145 /* ensure all component parts of bearer name are present */
146 media_name = name_copy;
147 if_name = strchr(media_name, ':');
148 if (if_name == NULL)
149 return 0;
150 *(if_name++) = 0;
151 media_len = if_name - media_name;
152 if_len = strlen(if_name) + 1;
153
154 /* validate component parts of bearer name */
155 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
156 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
157 return 0;
158
159 /* return bearer name components, if necessary */
160 if (name_parts) {
161 strcpy(name_parts->media_name, media_name);
162 strcpy(name_parts->if_name, if_name);
163 }
164 return 1;
165 }
166
167 /**
168 * tipc_bearer_find - locates bearer object with matching bearer name
169 */
170 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
171 {
172 struct tipc_net *tn = net_generic(net, tipc_net_id);
173 struct tipc_bearer *b;
174 u32 i;
175
176 for (i = 0; i < MAX_BEARERS; i++) {
177 b = rtnl_dereference(tn->bearer_list[i]);
178 if (b && (!strcmp(b->name, name)))
179 return b;
180 }
181 return NULL;
182 }
183
184 /* tipc_bearer_get_name - get the bearer name from its id.
185 * @net: network namespace
186 * @name: a pointer to the buffer where the name will be stored.
187 * @bearer_id: the id to get the name from.
188 */
189 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
190 {
191 struct tipc_net *tn = tipc_net(net);
192 struct tipc_bearer *b;
193
194 if (bearer_id >= MAX_BEARERS)
195 return -EINVAL;
196
197 b = rtnl_dereference(tn->bearer_list[bearer_id]);
198 if (!b)
199 return -EINVAL;
200
201 strcpy(name, b->name);
202 return 0;
203 }
204
205 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
206 {
207 struct tipc_net *tn = net_generic(net, tipc_net_id);
208 struct tipc_bearer *b;
209
210 rcu_read_lock();
211 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
212 if (b)
213 tipc_disc_add_dest(b->link_req);
214 rcu_read_unlock();
215 }
216
217 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
218 {
219 struct tipc_net *tn = net_generic(net, tipc_net_id);
220 struct tipc_bearer *b;
221
222 rcu_read_lock();
223 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
224 if (b)
225 tipc_disc_remove_dest(b->link_req);
226 rcu_read_unlock();
227 }
228
229 /**
230 * tipc_enable_bearer - enable bearer with the given name
231 */
232 static int tipc_enable_bearer(struct net *net, const char *name,
233 u32 disc_domain, u32 priority,
234 struct nlattr *attr[])
235 {
236 struct tipc_net *tn = net_generic(net, tipc_net_id);
237 struct tipc_bearer *b;
238 struct tipc_media *m;
239 struct tipc_bearer_names b_names;
240 struct sk_buff *skb;
241 char addr_string[16];
242 u32 bearer_id;
243 u32 with_this_prio;
244 u32 i;
245 int res = -EINVAL;
246
247 if (!tn->own_addr) {
248 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
249 name);
250 return -ENOPROTOOPT;
251 }
252 if (!bearer_name_validate(name, &b_names)) {
253 pr_warn("Bearer <%s> rejected, illegal name\n", name);
254 return -EINVAL;
255 }
256 if (tipc_addr_domain_valid(disc_domain) &&
257 (disc_domain != tn->own_addr)) {
258 if (tipc_in_scope(disc_domain, tn->own_addr)) {
259 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
260 res = 0; /* accept any node in own cluster */
261 } else if (in_own_cluster_exact(net, disc_domain))
262 res = 0; /* accept specified node in own cluster */
263 }
264 if (res) {
265 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
266 name);
267 return -EINVAL;
268 }
269 if ((priority > TIPC_MAX_LINK_PRI) &&
270 (priority != TIPC_MEDIA_LINK_PRI)) {
271 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
272 return -EINVAL;
273 }
274
275 m = tipc_media_find(b_names.media_name);
276 if (!m) {
277 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
278 name, b_names.media_name);
279 return -EINVAL;
280 }
281
282 if (priority == TIPC_MEDIA_LINK_PRI)
283 priority = m->priority;
284
285 restart:
286 bearer_id = MAX_BEARERS;
287 with_this_prio = 1;
288 for (i = MAX_BEARERS; i-- != 0; ) {
289 b = rtnl_dereference(tn->bearer_list[i]);
290 if (!b) {
291 bearer_id = i;
292 continue;
293 }
294 if (!strcmp(name, b->name)) {
295 pr_warn("Bearer <%s> rejected, already enabled\n",
296 name);
297 return -EINVAL;
298 }
299 if ((b->priority == priority) &&
300 (++with_this_prio > 2)) {
301 if (priority-- == 0) {
302 pr_warn("Bearer <%s> rejected, duplicate priority\n",
303 name);
304 return -EINVAL;
305 }
306 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
307 name, priority + 1, priority);
308 goto restart;
309 }
310 }
311 if (bearer_id >= MAX_BEARERS) {
312 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
313 name, MAX_BEARERS);
314 return -EINVAL;
315 }
316
317 b = kzalloc(sizeof(*b), GFP_ATOMIC);
318 if (!b)
319 return -ENOMEM;
320
321 strcpy(b->name, name);
322 b->media = m;
323 res = m->enable_media(net, b, attr);
324 if (res) {
325 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
326 name, -res);
327 return -EINVAL;
328 }
329
330 b->identity = bearer_id;
331 b->tolerance = m->tolerance;
332 b->window = m->window;
333 b->domain = disc_domain;
334 b->net_plane = bearer_id + 'A';
335 b->priority = priority;
336 test_and_set_bit_lock(0, &b->up);
337
338 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
339 if (res) {
340 bearer_disable(net, b);
341 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
342 name);
343 return -EINVAL;
344 }
345
346 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
347 if (skb)
348 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
349
350 if (tipc_mon_create(net, bearer_id))
351 return -ENOMEM;
352
353 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
354 name,
355 tipc_addr_string_fill(addr_string, disc_domain), priority);
356 return res;
357 }
358
359 /**
360 * tipc_reset_bearer - Reset all links established over this bearer
361 */
362 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
363 {
364 pr_info("Resetting bearer <%s>\n", b->name);
365 tipc_node_delete_links(net, b->identity);
366 tipc_disc_reset(net, b);
367 return 0;
368 }
369
370 /* tipc_bearer_reset_all - reset all links on all bearers
371 */
372 void tipc_bearer_reset_all(struct net *net)
373 {
374 struct tipc_bearer *b;
375 int i;
376
377 for (i = 0; i < MAX_BEARERS; i++) {
378 b = bearer_get(net, i);
379 if (b)
380 clear_bit_unlock(0, &b->up);
381 }
382 for (i = 0; i < MAX_BEARERS; i++) {
383 b = bearer_get(net, i);
384 if (b)
385 tipc_reset_bearer(net, b);
386 }
387 for (i = 0; i < MAX_BEARERS; i++) {
388 b = bearer_get(net, i);
389 if (b)
390 test_and_set_bit_lock(0, &b->up);
391 }
392 }
393
394 /**
395 * bearer_disable
396 *
397 * Note: This routine assumes caller holds RTNL lock.
398 */
399 static void bearer_disable(struct net *net, struct tipc_bearer *b)
400 {
401 struct tipc_net *tn = tipc_net(net);
402 int bearer_id = b->identity;
403
404 pr_info("Disabling bearer <%s>\n", b->name);
405 clear_bit_unlock(0, &b->up);
406 tipc_node_delete_links(net, bearer_id);
407 b->media->disable_media(b);
408 RCU_INIT_POINTER(b->media_ptr, NULL);
409 if (b->link_req)
410 tipc_disc_delete(b->link_req);
411 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
412 kfree_rcu(b, rcu);
413 tipc_mon_delete(net, bearer_id);
414 }
415
416 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
417 struct nlattr *attr[])
418 {
419 struct net_device *dev;
420 char *driver_name = strchr((const char *)b->name, ':') + 1;
421
422 /* Find device with specified name */
423 dev = dev_get_by_name(net, driver_name);
424 if (!dev)
425 return -ENODEV;
426 if (tipc_mtu_bad(dev, 0)) {
427 dev_put(dev);
428 return -EINVAL;
429 }
430
431 /* Associate TIPC bearer with L2 bearer */
432 rcu_assign_pointer(b->media_ptr, dev);
433 b->pt.dev = dev;
434 b->pt.type = htons(ETH_P_TIPC);
435 b->pt.func = tipc_l2_rcv_msg;
436 dev_add_pack(&b->pt);
437 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
438 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
439 b->bcast_addr.media_id = b->media->type_id;
440 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
441 b->mtu = dev->mtu;
442 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
443 rcu_assign_pointer(dev->tipc_ptr, b);
444 return 0;
445 }
446
447 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
448 *
449 * Mark L2 bearer as inactive so that incoming buffers are thrown away
450 */
451 void tipc_disable_l2_media(struct tipc_bearer *b)
452 {
453 struct net_device *dev;
454
455 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
456 dev_remove_pack(&b->pt);
457 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
458 synchronize_net();
459 dev_put(dev);
460 }
461
462 /**
463 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
464 * @skb: the packet to be sent
465 * @b: the bearer through which the packet is to be sent
466 * @dest: peer destination address
467 */
468 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
469 struct tipc_bearer *b, struct tipc_media_addr *dest)
470 {
471 struct net_device *dev;
472 int delta;
473
474 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
475 if (!dev)
476 return 0;
477
478 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
479 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
480 kfree_skb(skb);
481 return 0;
482 }
483 skb_reset_network_header(skb);
484 skb->dev = dev;
485 skb->protocol = htons(ETH_P_TIPC);
486 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
487 dev->dev_addr, skb->len);
488 dev_queue_xmit(skb);
489 return 0;
490 }
491
492 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
493 {
494 bool supp = false;
495 struct tipc_bearer *b;
496
497 rcu_read_lock();
498 b = bearer_get(net, bearer_id);
499 if (b)
500 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
501 rcu_read_unlock();
502 return supp;
503 }
504
505 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
506 {
507 int mtu = 0;
508 struct tipc_bearer *b;
509
510 rcu_read_lock();
511 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
512 if (b)
513 mtu = b->mtu;
514 rcu_read_unlock();
515 return mtu;
516 }
517
518 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
519 */
520 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
521 struct sk_buff *skb,
522 struct tipc_media_addr *dest)
523 {
524 struct tipc_msg *hdr = buf_msg(skb);
525 struct tipc_bearer *b;
526
527 rcu_read_lock();
528 b = bearer_get(net, bearer_id);
529 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
530 b->media->send_msg(net, skb, b, dest);
531 else
532 kfree_skb(skb);
533 rcu_read_unlock();
534 }
535
536 /* tipc_bearer_xmit() -send buffer to destination over bearer
537 */
538 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
539 struct sk_buff_head *xmitq,
540 struct tipc_media_addr *dst)
541 {
542 struct tipc_bearer *b;
543 struct sk_buff *skb, *tmp;
544
545 if (skb_queue_empty(xmitq))
546 return;
547
548 rcu_read_lock();
549 b = bearer_get(net, bearer_id);
550 if (unlikely(!b))
551 __skb_queue_purge(xmitq);
552 skb_queue_walk_safe(xmitq, skb, tmp) {
553 __skb_dequeue(xmitq);
554 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
555 b->media->send_msg(net, skb, b, dst);
556 else
557 kfree_skb(skb);
558 }
559 rcu_read_unlock();
560 }
561
562 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
563 */
564 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
565 struct sk_buff_head *xmitq)
566 {
567 struct tipc_net *tn = tipc_net(net);
568 int net_id = tn->net_id;
569 struct tipc_bearer *b;
570 struct sk_buff *skb, *tmp;
571 struct tipc_msg *hdr;
572
573 rcu_read_lock();
574 b = bearer_get(net, bearer_id);
575 if (unlikely(!b || !test_bit(0, &b->up)))
576 __skb_queue_purge(xmitq);
577 skb_queue_walk_safe(xmitq, skb, tmp) {
578 hdr = buf_msg(skb);
579 msg_set_non_seq(hdr, 1);
580 msg_set_mc_netid(hdr, net_id);
581 __skb_dequeue(xmitq);
582 b->media->send_msg(net, skb, b, &b->bcast_addr);
583 }
584 rcu_read_unlock();
585 }
586
587 /**
588 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
589 * @buf: the received packet
590 * @dev: the net device that the packet was received on
591 * @pt: the packet_type structure which was used to register this handler
592 * @orig_dev: the original receive net device in case the device is a bond
593 *
594 * Accept only packets explicitly sent to this node, or broadcast packets;
595 * ignores packets sent using interface multicast, and traffic sent to other
596 * nodes (which can happen if interface is running in promiscuous mode).
597 */
598 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
599 struct packet_type *pt, struct net_device *orig_dev)
600 {
601 struct tipc_bearer *b;
602
603 rcu_read_lock();
604 b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
605 rcu_dereference_rtnl(orig_dev->tipc_ptr);
606 if (likely(b && test_bit(0, &b->up) &&
607 (skb->pkt_type <= PACKET_MULTICAST))) {
608 skb->next = NULL;
609 tipc_rcv(dev_net(b->pt.dev), skb, b);
610 rcu_read_unlock();
611 return NET_RX_SUCCESS;
612 }
613 rcu_read_unlock();
614 kfree_skb(skb);
615 return NET_RX_DROP;
616 }
617
618 /**
619 * tipc_l2_device_event - handle device events from network device
620 * @nb: the context of the notification
621 * @evt: the type of event
622 * @ptr: the net device that the event was on
623 *
624 * This function is called by the Ethernet driver in case of link
625 * change event.
626 */
627 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
628 void *ptr)
629 {
630 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
631 struct net *net = dev_net(dev);
632 struct tipc_bearer *b;
633
634 b = rtnl_dereference(dev->tipc_ptr);
635 if (!b)
636 return NOTIFY_DONE;
637
638 switch (evt) {
639 case NETDEV_CHANGE:
640 if (netif_carrier_ok(dev))
641 break;
642 case NETDEV_UP:
643 test_and_set_bit_lock(0, &b->up);
644 break;
645 case NETDEV_GOING_DOWN:
646 clear_bit_unlock(0, &b->up);
647 tipc_reset_bearer(net, b);
648 break;
649 case NETDEV_CHANGEMTU:
650 if (tipc_mtu_bad(dev, 0)) {
651 bearer_disable(net, b);
652 break;
653 }
654 b->mtu = dev->mtu;
655 tipc_reset_bearer(net, b);
656 break;
657 case NETDEV_CHANGEADDR:
658 b->media->raw2addr(b, &b->addr,
659 (char *)dev->dev_addr);
660 tipc_reset_bearer(net, b);
661 break;
662 case NETDEV_UNREGISTER:
663 case NETDEV_CHANGENAME:
664 bearer_disable(dev_net(dev), b);
665 break;
666 }
667 return NOTIFY_OK;
668 }
669
670 static struct notifier_block notifier = {
671 .notifier_call = tipc_l2_device_event,
672 .priority = 0,
673 };
674
675 int tipc_bearer_setup(void)
676 {
677 return register_netdevice_notifier(&notifier);
678 }
679
680 void tipc_bearer_cleanup(void)
681 {
682 unregister_netdevice_notifier(&notifier);
683 }
684
685 void tipc_bearer_stop(struct net *net)
686 {
687 struct tipc_net *tn = net_generic(net, tipc_net_id);
688 struct tipc_bearer *b;
689 u32 i;
690
691 for (i = 0; i < MAX_BEARERS; i++) {
692 b = rtnl_dereference(tn->bearer_list[i]);
693 if (b) {
694 bearer_disable(net, b);
695 tn->bearer_list[i] = NULL;
696 }
697 }
698 }
699
700 /* Caller should hold rtnl_lock to protect the bearer */
701 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
702 struct tipc_bearer *bearer, int nlflags)
703 {
704 void *hdr;
705 struct nlattr *attrs;
706 struct nlattr *prop;
707
708 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
709 nlflags, TIPC_NL_BEARER_GET);
710 if (!hdr)
711 return -EMSGSIZE;
712
713 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
714 if (!attrs)
715 goto msg_full;
716
717 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
718 goto attr_msg_full;
719
720 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
721 if (!prop)
722 goto prop_msg_full;
723 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
724 goto prop_msg_full;
725 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
726 goto prop_msg_full;
727 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
728 goto prop_msg_full;
729
730 nla_nest_end(msg->skb, prop);
731
732 #ifdef CONFIG_TIPC_MEDIA_UDP
733 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
734 if (tipc_udp_nl_add_bearer_data(msg, bearer))
735 goto attr_msg_full;
736 }
737 #endif
738
739 nla_nest_end(msg->skb, attrs);
740 genlmsg_end(msg->skb, hdr);
741
742 return 0;
743
744 prop_msg_full:
745 nla_nest_cancel(msg->skb, prop);
746 attr_msg_full:
747 nla_nest_cancel(msg->skb, attrs);
748 msg_full:
749 genlmsg_cancel(msg->skb, hdr);
750
751 return -EMSGSIZE;
752 }
753
754 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
755 {
756 int err;
757 int i = cb->args[0];
758 struct tipc_bearer *bearer;
759 struct tipc_nl_msg msg;
760 struct net *net = sock_net(skb->sk);
761 struct tipc_net *tn = net_generic(net, tipc_net_id);
762
763 if (i == MAX_BEARERS)
764 return 0;
765
766 msg.skb = skb;
767 msg.portid = NETLINK_CB(cb->skb).portid;
768 msg.seq = cb->nlh->nlmsg_seq;
769
770 rtnl_lock();
771 for (i = 0; i < MAX_BEARERS; i++) {
772 bearer = rtnl_dereference(tn->bearer_list[i]);
773 if (!bearer)
774 continue;
775
776 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
777 if (err)
778 break;
779 }
780 rtnl_unlock();
781
782 cb->args[0] = i;
783 return skb->len;
784 }
785
786 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
787 {
788 int err;
789 char *name;
790 struct sk_buff *rep;
791 struct tipc_bearer *bearer;
792 struct tipc_nl_msg msg;
793 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
794 struct net *net = genl_info_net(info);
795
796 if (!info->attrs[TIPC_NLA_BEARER])
797 return -EINVAL;
798
799 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
800 info->attrs[TIPC_NLA_BEARER],
801 tipc_nl_bearer_policy, info->extack);
802 if (err)
803 return err;
804
805 if (!attrs[TIPC_NLA_BEARER_NAME])
806 return -EINVAL;
807 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
808
809 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
810 if (!rep)
811 return -ENOMEM;
812
813 msg.skb = rep;
814 msg.portid = info->snd_portid;
815 msg.seq = info->snd_seq;
816
817 rtnl_lock();
818 bearer = tipc_bearer_find(net, name);
819 if (!bearer) {
820 err = -EINVAL;
821 goto err_out;
822 }
823
824 err = __tipc_nl_add_bearer(&msg, bearer, 0);
825 if (err)
826 goto err_out;
827 rtnl_unlock();
828
829 return genlmsg_reply(rep, info);
830 err_out:
831 rtnl_unlock();
832 nlmsg_free(rep);
833
834 return err;
835 }
836
837 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
838 {
839 int err;
840 char *name;
841 struct tipc_bearer *bearer;
842 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
843 struct net *net = sock_net(skb->sk);
844
845 if (!info->attrs[TIPC_NLA_BEARER])
846 return -EINVAL;
847
848 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
849 info->attrs[TIPC_NLA_BEARER],
850 tipc_nl_bearer_policy, info->extack);
851 if (err)
852 return err;
853
854 if (!attrs[TIPC_NLA_BEARER_NAME])
855 return -EINVAL;
856
857 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
858
859 rtnl_lock();
860 bearer = tipc_bearer_find(net, name);
861 if (!bearer) {
862 rtnl_unlock();
863 return -EINVAL;
864 }
865
866 bearer_disable(net, bearer);
867 rtnl_unlock();
868
869 return 0;
870 }
871
872 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
873 {
874 int err;
875 char *bearer;
876 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
877 struct net *net = sock_net(skb->sk);
878 struct tipc_net *tn = net_generic(net, tipc_net_id);
879 u32 domain;
880 u32 prio;
881
882 prio = TIPC_MEDIA_LINK_PRI;
883 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
884
885 if (!info->attrs[TIPC_NLA_BEARER])
886 return -EINVAL;
887
888 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
889 info->attrs[TIPC_NLA_BEARER],
890 tipc_nl_bearer_policy, info->extack);
891 if (err)
892 return err;
893
894 if (!attrs[TIPC_NLA_BEARER_NAME])
895 return -EINVAL;
896
897 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
898
899 if (attrs[TIPC_NLA_BEARER_DOMAIN])
900 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
901
902 if (attrs[TIPC_NLA_BEARER_PROP]) {
903 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
904
905 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
906 props);
907 if (err)
908 return err;
909
910 if (props[TIPC_NLA_PROP_PRIO])
911 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
912 }
913
914 rtnl_lock();
915 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
916 if (err) {
917 rtnl_unlock();
918 return err;
919 }
920 rtnl_unlock();
921
922 return 0;
923 }
924
925 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
926 {
927 int err;
928 char *name;
929 struct tipc_bearer *b;
930 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
931 struct net *net = sock_net(skb->sk);
932
933 if (!info->attrs[TIPC_NLA_BEARER])
934 return -EINVAL;
935
936 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
937 info->attrs[TIPC_NLA_BEARER],
938 tipc_nl_bearer_policy, info->extack);
939 if (err)
940 return err;
941
942 if (!attrs[TIPC_NLA_BEARER_NAME])
943 return -EINVAL;
944 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
945
946 rtnl_lock();
947 b = tipc_bearer_find(net, name);
948 if (!b) {
949 rtnl_unlock();
950 return -EINVAL;
951 }
952
953 #ifdef CONFIG_TIPC_MEDIA_UDP
954 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
955 err = tipc_udp_nl_bearer_add(b,
956 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
957 if (err) {
958 rtnl_unlock();
959 return err;
960 }
961 }
962 #endif
963 rtnl_unlock();
964
965 return 0;
966 }
967
968 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
969 {
970 int err;
971 char *name;
972 struct tipc_bearer *b;
973 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
974 struct net *net = sock_net(skb->sk);
975
976 if (!info->attrs[TIPC_NLA_BEARER])
977 return -EINVAL;
978
979 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
980 info->attrs[TIPC_NLA_BEARER],
981 tipc_nl_bearer_policy, info->extack);
982 if (err)
983 return err;
984
985 if (!attrs[TIPC_NLA_BEARER_NAME])
986 return -EINVAL;
987 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
988
989 rtnl_lock();
990 b = tipc_bearer_find(net, name);
991 if (!b) {
992 rtnl_unlock();
993 return -EINVAL;
994 }
995
996 if (attrs[TIPC_NLA_BEARER_PROP]) {
997 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
998
999 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1000 props);
1001 if (err) {
1002 rtnl_unlock();
1003 return err;
1004 }
1005
1006 if (props[TIPC_NLA_PROP_TOL])
1007 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1008 if (props[TIPC_NLA_PROP_PRIO])
1009 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1010 if (props[TIPC_NLA_PROP_WIN])
1011 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1012 }
1013 rtnl_unlock();
1014
1015 return 0;
1016 }
1017
1018 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1019 struct tipc_media *media, int nlflags)
1020 {
1021 void *hdr;
1022 struct nlattr *attrs;
1023 struct nlattr *prop;
1024
1025 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1026 nlflags, TIPC_NL_MEDIA_GET);
1027 if (!hdr)
1028 return -EMSGSIZE;
1029
1030 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1031 if (!attrs)
1032 goto msg_full;
1033
1034 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1035 goto attr_msg_full;
1036
1037 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1038 if (!prop)
1039 goto prop_msg_full;
1040 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1041 goto prop_msg_full;
1042 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1043 goto prop_msg_full;
1044 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1045 goto prop_msg_full;
1046
1047 nla_nest_end(msg->skb, prop);
1048 nla_nest_end(msg->skb, attrs);
1049 genlmsg_end(msg->skb, hdr);
1050
1051 return 0;
1052
1053 prop_msg_full:
1054 nla_nest_cancel(msg->skb, prop);
1055 attr_msg_full:
1056 nla_nest_cancel(msg->skb, attrs);
1057 msg_full:
1058 genlmsg_cancel(msg->skb, hdr);
1059
1060 return -EMSGSIZE;
1061 }
1062
1063 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1064 {
1065 int err;
1066 int i = cb->args[0];
1067 struct tipc_nl_msg msg;
1068
1069 if (i == MAX_MEDIA)
1070 return 0;
1071
1072 msg.skb = skb;
1073 msg.portid = NETLINK_CB(cb->skb).portid;
1074 msg.seq = cb->nlh->nlmsg_seq;
1075
1076 rtnl_lock();
1077 for (; media_info_array[i] != NULL; i++) {
1078 err = __tipc_nl_add_media(&msg, media_info_array[i],
1079 NLM_F_MULTI);
1080 if (err)
1081 break;
1082 }
1083 rtnl_unlock();
1084
1085 cb->args[0] = i;
1086 return skb->len;
1087 }
1088
1089 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1090 {
1091 int err;
1092 char *name;
1093 struct tipc_nl_msg msg;
1094 struct tipc_media *media;
1095 struct sk_buff *rep;
1096 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1097
1098 if (!info->attrs[TIPC_NLA_MEDIA])
1099 return -EINVAL;
1100
1101 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1102 info->attrs[TIPC_NLA_MEDIA],
1103 tipc_nl_media_policy, info->extack);
1104 if (err)
1105 return err;
1106
1107 if (!attrs[TIPC_NLA_MEDIA_NAME])
1108 return -EINVAL;
1109 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1110
1111 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1112 if (!rep)
1113 return -ENOMEM;
1114
1115 msg.skb = rep;
1116 msg.portid = info->snd_portid;
1117 msg.seq = info->snd_seq;
1118
1119 rtnl_lock();
1120 media = tipc_media_find(name);
1121 if (!media) {
1122 err = -EINVAL;
1123 goto err_out;
1124 }
1125
1126 err = __tipc_nl_add_media(&msg, media, 0);
1127 if (err)
1128 goto err_out;
1129 rtnl_unlock();
1130
1131 return genlmsg_reply(rep, info);
1132 err_out:
1133 rtnl_unlock();
1134 nlmsg_free(rep);
1135
1136 return err;
1137 }
1138
1139 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1140 {
1141 int err;
1142 char *name;
1143 struct tipc_media *m;
1144 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1145
1146 if (!info->attrs[TIPC_NLA_MEDIA])
1147 return -EINVAL;
1148
1149 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1150 info->attrs[TIPC_NLA_MEDIA],
1151 tipc_nl_media_policy, info->extack);
1152
1153 if (!attrs[TIPC_NLA_MEDIA_NAME])
1154 return -EINVAL;
1155 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1156
1157 rtnl_lock();
1158 m = tipc_media_find(name);
1159 if (!m) {
1160 rtnl_unlock();
1161 return -EINVAL;
1162 }
1163
1164 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1165 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1166
1167 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1168 props);
1169 if (err) {
1170 rtnl_unlock();
1171 return err;
1172 }
1173
1174 if (props[TIPC_NLA_PROP_TOL])
1175 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1176 if (props[TIPC_NLA_PROP_PRIO])
1177 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1178 if (props[TIPC_NLA_PROP_WIN])
1179 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1180 }
1181 rtnl_unlock();
1182
1183 return 0;
1184 }
Linux with added FPC-III support