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1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2014, 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 "bcast.h"
43#include "netlink.h"
44
45#define MAX_ADDR_STR 60
46
47static struct tipc_media * const media_info_array[] = {
48 ð_media_info,
49#ifdef CONFIG_TIPC_MEDIA_IB
50 &ib_media_info,
51#endif
52#ifdef CONFIG_TIPC_MEDIA_UDP
53 &udp_media_info,
54#endif
55 NULL
56};
57
58static void bearer_disable(struct net *net, struct tipc_bearer *b);
59
60/**
61 * tipc_media_find - locates specified media object by name
62 */
63struct tipc_media *tipc_media_find(const char *name)
64{
65 u32 i;
66
67 for (i = 0; media_info_array[i] != NULL; i++) {
68 if (!strcmp(media_info_array[i]->name, name))
69 break;
70 }
71 return media_info_array[i];
72}
73
74/**
75 * media_find_id - locates specified media object by type identifier
76 */
77static struct tipc_media *media_find_id(u8 type)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (media_info_array[i]->type_id == type)
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * tipc_media_addr_printf - record media address in print buffer
90 */
91void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
92{
93 char addr_str[MAX_ADDR_STR];
94 struct tipc_media *m;
95 int ret;
96
97 m = media_find_id(a->media_id);
98
99 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
100 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
101 else {
102 u32 i;
103
104 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
105 for (i = 0; i < sizeof(a->value); i++)
106 ret += scnprintf(buf - ret, len + ret,
107 "-%02x", a->value[i]);
108 }
109}
110
111/**
112 * bearer_name_validate - validate & (optionally) deconstruct bearer name
113 * @name: ptr to bearer name string
114 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
115 *
116 * Returns 1 if bearer name is valid, otherwise 0.
117 */
118static int bearer_name_validate(const char *name,
119 struct tipc_bearer_names *name_parts)
120{
121 char name_copy[TIPC_MAX_BEARER_NAME];
122 char *media_name;
123 char *if_name;
124 u32 media_len;
125 u32 if_len;
126
127 /* copy bearer name & ensure length is OK */
128 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
129 /* need above in case non-Posix strncpy() doesn't pad with nulls */
130 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
131 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
132 return 0;
133
134 /* ensure all component parts of bearer name are present */
135 media_name = name_copy;
136 if_name = strchr(media_name, ':');
137 if (if_name == NULL)
138 return 0;
139 *(if_name++) = 0;
140 media_len = if_name - media_name;
141 if_len = strlen(if_name) + 1;
142
143 /* validate component parts of bearer name */
144 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
145 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
146 return 0;
147
148 /* return bearer name components, if necessary */
149 if (name_parts) {
150 strcpy(name_parts->media_name, media_name);
151 strcpy(name_parts->if_name, if_name);
152 }
153 return 1;
154}
155
156/**
157 * tipc_bearer_find - locates bearer object with matching bearer name
158 */
159struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
160{
161 struct tipc_net *tn = net_generic(net, tipc_net_id);
162 struct tipc_bearer *b;
163 u32 i;
164
165 for (i = 0; i < MAX_BEARERS; i++) {
166 b = rtnl_dereference(tn->bearer_list[i]);
167 if (b && (!strcmp(b->name, name)))
168 return b;
169 }
170 return NULL;
171}
172
173void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b;
177
178 rcu_read_lock();
179 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
180 if (b)
181 tipc_disc_add_dest(b->link_req);
182 rcu_read_unlock();
183}
184
185void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
186{
187 struct tipc_net *tn = net_generic(net, tipc_net_id);
188 struct tipc_bearer *b;
189
190 rcu_read_lock();
191 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
192 if (b)
193 tipc_disc_remove_dest(b->link_req);
194 rcu_read_unlock();
195}
196
197/**
198 * tipc_enable_bearer - enable bearer with the given name
199 */
200static int tipc_enable_bearer(struct net *net, const char *name,
201 u32 disc_domain, u32 priority,
202 struct nlattr *attr[])
203{
204 struct tipc_net *tn = net_generic(net, tipc_net_id);
205 struct tipc_bearer *b;
206 struct tipc_media *m;
207 struct tipc_bearer_names b_names;
208 char addr_string[16];
209 u32 bearer_id;
210 u32 with_this_prio;
211 u32 i;
212 int res = -EINVAL;
213
214 if (!tn->own_addr) {
215 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
216 name);
217 return -ENOPROTOOPT;
218 }
219 if (!bearer_name_validate(name, &b_names)) {
220 pr_warn("Bearer <%s> rejected, illegal name\n", name);
221 return -EINVAL;
222 }
223 if (tipc_addr_domain_valid(disc_domain) &&
224 (disc_domain != tn->own_addr)) {
225 if (tipc_in_scope(disc_domain, tn->own_addr)) {
226 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
227 res = 0; /* accept any node in own cluster */
228 } else if (in_own_cluster_exact(net, disc_domain))
229 res = 0; /* accept specified node in own cluster */
230 }
231 if (res) {
232 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
233 name);
234 return -EINVAL;
235 }
236 if ((priority > TIPC_MAX_LINK_PRI) &&
237 (priority != TIPC_MEDIA_LINK_PRI)) {
238 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
239 return -EINVAL;
240 }
241
242 m = tipc_media_find(b_names.media_name);
243 if (!m) {
244 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
245 name, b_names.media_name);
246 return -EINVAL;
247 }
248
249 if (priority == TIPC_MEDIA_LINK_PRI)
250 priority = m->priority;
251
252restart:
253 bearer_id = MAX_BEARERS;
254 with_this_prio = 1;
255 for (i = MAX_BEARERS; i-- != 0; ) {
256 b = rtnl_dereference(tn->bearer_list[i]);
257 if (!b) {
258 bearer_id = i;
259 continue;
260 }
261 if (!strcmp(name, b->name)) {
262 pr_warn("Bearer <%s> rejected, already enabled\n",
263 name);
264 return -EINVAL;
265 }
266 if ((b->priority == priority) &&
267 (++with_this_prio > 2)) {
268 if (priority-- == 0) {
269 pr_warn("Bearer <%s> rejected, duplicate priority\n",
270 name);
271 return -EINVAL;
272 }
273 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
274 name, priority + 1, priority);
275 goto restart;
276 }
277 }
278 if (bearer_id >= MAX_BEARERS) {
279 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
280 name, MAX_BEARERS);
281 return -EINVAL;
282 }
283
284 b = kzalloc(sizeof(*b), GFP_ATOMIC);
285 if (!b)
286 return -ENOMEM;
287
288 strcpy(b->name, name);
289 b->media = m;
290 res = m->enable_media(net, b, attr);
291 if (res) {
292 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
293 name, -res);
294 return -EINVAL;
295 }
296
297 b->identity = bearer_id;
298 b->tolerance = m->tolerance;
299 b->window = m->window;
300 b->domain = disc_domain;
301 b->net_plane = bearer_id + 'A';
302 b->priority = priority;
303
304 res = tipc_disc_create(net, b, &b->bcast_addr);
305 if (res) {
306 bearer_disable(net, b);
307 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
308 name);
309 return -EINVAL;
310 }
311
312 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
313
314 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
315 name,
316 tipc_addr_string_fill(addr_string, disc_domain), priority);
317 return res;
318}
319
320/**
321 * tipc_reset_bearer - Reset all links established over this bearer
322 */
323static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
324{
325 pr_info("Resetting bearer <%s>\n", b->name);
326 tipc_node_delete_links(net, b->identity);
327 tipc_disc_reset(net, b);
328 return 0;
329}
330
331/**
332 * bearer_disable
333 *
334 * Note: This routine assumes caller holds RTNL lock.
335 */
336static void bearer_disable(struct net *net, struct tipc_bearer *b)
337{
338 struct tipc_net *tn = net_generic(net, tipc_net_id);
339 u32 i;
340
341 pr_info("Disabling bearer <%s>\n", b->name);
342 b->media->disable_media(b);
343
344 tipc_node_delete_links(net, b->identity);
345 RCU_INIT_POINTER(b->media_ptr, NULL);
346 if (b->link_req)
347 tipc_disc_delete(b->link_req);
348
349 for (i = 0; i < MAX_BEARERS; i++) {
350 if (b == rtnl_dereference(tn->bearer_list[i])) {
351 RCU_INIT_POINTER(tn->bearer_list[i], NULL);
352 break;
353 }
354 }
355 kfree_rcu(b, rcu);
356}
357
358int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
359 struct nlattr *attr[])
360{
361 struct net_device *dev;
362 char *driver_name = strchr((const char *)b->name, ':') + 1;
363
364 /* Find device with specified name */
365 dev = dev_get_by_name(net, driver_name);
366 if (!dev)
367 return -ENODEV;
368
369 /* Associate TIPC bearer with L2 bearer */
370 rcu_assign_pointer(b->media_ptr, dev);
371 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
372 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
373 b->bcast_addr.media_id = b->media->type_id;
374 b->bcast_addr.broadcast = 1;
375 b->mtu = dev->mtu;
376 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
377 rcu_assign_pointer(dev->tipc_ptr, b);
378 return 0;
379}
380
381/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
382 *
383 * Mark L2 bearer as inactive so that incoming buffers are thrown away
384 */
385void tipc_disable_l2_media(struct tipc_bearer *b)
386{
387 struct net_device *dev;
388
389 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
390 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
391 synchronize_net();
392 dev_put(dev);
393}
394
395/**
396 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
397 * @buf: the packet to be sent
398 * @b: the bearer through which the packet is to be sent
399 * @dest: peer destination address
400 */
401int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
402 struct tipc_bearer *b, struct tipc_media_addr *dest)
403{
404 struct net_device *dev;
405 int delta;
406
407 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
408 if (!dev)
409 return 0;
410
411 delta = dev->hard_header_len - skb_headroom(skb);
412 if ((delta > 0) &&
413 pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
414 kfree_skb(skb);
415 return 0;
416 }
417
418 skb_reset_network_header(skb);
419 skb->dev = dev;
420 skb->protocol = htons(ETH_P_TIPC);
421 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
422 dev->dev_addr, skb->len);
423 dev_queue_xmit(skb);
424 return 0;
425}
426
427int tipc_bearer_mtu(struct net *net, u32 bearer_id)
428{
429 int mtu = 0;
430 struct tipc_bearer *b;
431
432 rcu_read_lock();
433 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
434 if (b)
435 mtu = b->mtu;
436 rcu_read_unlock();
437 return mtu;
438}
439
440/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
441 */
442void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
443 struct sk_buff *skb,
444 struct tipc_media_addr *dest)
445{
446 struct tipc_net *tn = tipc_net(net);
447 struct tipc_bearer *b;
448
449 rcu_read_lock();
450 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
451 if (likely(b))
452 b->media->send_msg(net, skb, b, dest);
453 rcu_read_unlock();
454}
455
456/* tipc_bearer_xmit() -send buffer to destination over bearer
457 */
458void tipc_bearer_xmit(struct net *net, u32 bearer_id,
459 struct sk_buff_head *xmitq,
460 struct tipc_media_addr *dst)
461{
462 struct tipc_net *tn = net_generic(net, tipc_net_id);
463 struct tipc_bearer *b;
464 struct sk_buff *skb, *tmp;
465
466 if (skb_queue_empty(xmitq))
467 return;
468
469 rcu_read_lock();
470 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
471 if (likely(b)) {
472 skb_queue_walk_safe(xmitq, skb, tmp) {
473 __skb_dequeue(xmitq);
474 b->media->send_msg(net, skb, b, dst);
475 }
476 }
477 rcu_read_unlock();
478}
479
480/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
481 */
482void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
483 struct sk_buff_head *xmitq)
484{
485 struct tipc_net *tn = tipc_net(net);
486 int net_id = tn->net_id;
487 struct tipc_bearer *b;
488 struct sk_buff *skb, *tmp;
489 struct tipc_msg *hdr;
490
491 rcu_read_lock();
492 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
493 if (likely(b)) {
494 skb_queue_walk_safe(xmitq, skb, tmp) {
495 hdr = buf_msg(skb);
496 msg_set_non_seq(hdr, 1);
497 msg_set_mc_netid(hdr, net_id);
498 __skb_dequeue(xmitq);
499 b->media->send_msg(net, skb, b, &b->bcast_addr);
500 }
501 }
502 rcu_read_unlock();
503}
504
505/**
506 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
507 * @buf: the received packet
508 * @dev: the net device that the packet was received on
509 * @pt: the packet_type structure which was used to register this handler
510 * @orig_dev: the original receive net device in case the device is a bond
511 *
512 * Accept only packets explicitly sent to this node, or broadcast packets;
513 * ignores packets sent using interface multicast, and traffic sent to other
514 * nodes (which can happen if interface is running in promiscuous mode).
515 */
516static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
517 struct packet_type *pt, struct net_device *orig_dev)
518{
519 struct tipc_bearer *b;
520
521 rcu_read_lock();
522 b = rcu_dereference_rtnl(dev->tipc_ptr);
523 if (likely(b)) {
524 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
525 buf->next = NULL;
526 tipc_rcv(dev_net(dev), buf, b);
527 rcu_read_unlock();
528 return NET_RX_SUCCESS;
529 }
530 }
531 rcu_read_unlock();
532
533 kfree_skb(buf);
534 return NET_RX_DROP;
535}
536
537/**
538 * tipc_l2_device_event - handle device events from network device
539 * @nb: the context of the notification
540 * @evt: the type of event
541 * @ptr: the net device that the event was on
542 *
543 * This function is called by the Ethernet driver in case of link
544 * change event.
545 */
546static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
547 void *ptr)
548{
549 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
550 struct net *net = dev_net(dev);
551 struct tipc_bearer *b;
552
553 b = rtnl_dereference(dev->tipc_ptr);
554 if (!b)
555 return NOTIFY_DONE;
556
557 b->mtu = dev->mtu;
558
559 switch (evt) {
560 case NETDEV_CHANGE:
561 if (netif_carrier_ok(dev))
562 break;
563 case NETDEV_GOING_DOWN:
564 case NETDEV_CHANGEMTU:
565 tipc_reset_bearer(net, b);
566 break;
567 case NETDEV_CHANGEADDR:
568 b->media->raw2addr(b, &b->addr,
569 (char *)dev->dev_addr);
570 tipc_reset_bearer(net, b);
571 break;
572 case NETDEV_UNREGISTER:
573 case NETDEV_CHANGENAME:
574 bearer_disable(dev_net(dev), b);
575 break;
576 }
577 return NOTIFY_OK;
578}
579
580static struct packet_type tipc_packet_type __read_mostly = {
581 .type = htons(ETH_P_TIPC),
582 .func = tipc_l2_rcv_msg,
583};
584
585static struct notifier_block notifier = {
586 .notifier_call = tipc_l2_device_event,
587 .priority = 0,
588};
589
590int tipc_bearer_setup(void)
591{
592 int err;
593
594 err = register_netdevice_notifier(¬ifier);
595 if (err)
596 return err;
597 dev_add_pack(&tipc_packet_type);
598 return 0;
599}
600
601void tipc_bearer_cleanup(void)
602{
603 unregister_netdevice_notifier(¬ifier);
604 dev_remove_pack(&tipc_packet_type);
605}
606
607void tipc_bearer_stop(struct net *net)
608{
609 struct tipc_net *tn = net_generic(net, tipc_net_id);
610 struct tipc_bearer *b;
611 u32 i;
612
613 for (i = 0; i < MAX_BEARERS; i++) {
614 b = rtnl_dereference(tn->bearer_list[i]);
615 if (b) {
616 bearer_disable(net, b);
617 tn->bearer_list[i] = NULL;
618 }
619 }
620}
621
622/* Caller should hold rtnl_lock to protect the bearer */
623static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
624 struct tipc_bearer *bearer, int nlflags)
625{
626 void *hdr;
627 struct nlattr *attrs;
628 struct nlattr *prop;
629
630 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
631 nlflags, TIPC_NL_BEARER_GET);
632 if (!hdr)
633 return -EMSGSIZE;
634
635 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
636 if (!attrs)
637 goto msg_full;
638
639 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
640 goto attr_msg_full;
641
642 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
643 if (!prop)
644 goto prop_msg_full;
645 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
646 goto prop_msg_full;
647 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
648 goto prop_msg_full;
649 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
650 goto prop_msg_full;
651
652 nla_nest_end(msg->skb, prop);
653 nla_nest_end(msg->skb, attrs);
654 genlmsg_end(msg->skb, hdr);
655
656 return 0;
657
658prop_msg_full:
659 nla_nest_cancel(msg->skb, prop);
660attr_msg_full:
661 nla_nest_cancel(msg->skb, attrs);
662msg_full:
663 genlmsg_cancel(msg->skb, hdr);
664
665 return -EMSGSIZE;
666}
667
668int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
669{
670 int err;
671 int i = cb->args[0];
672 struct tipc_bearer *bearer;
673 struct tipc_nl_msg msg;
674 struct net *net = sock_net(skb->sk);
675 struct tipc_net *tn = net_generic(net, tipc_net_id);
676
677 if (i == MAX_BEARERS)
678 return 0;
679
680 msg.skb = skb;
681 msg.portid = NETLINK_CB(cb->skb).portid;
682 msg.seq = cb->nlh->nlmsg_seq;
683
684 rtnl_lock();
685 for (i = 0; i < MAX_BEARERS; i++) {
686 bearer = rtnl_dereference(tn->bearer_list[i]);
687 if (!bearer)
688 continue;
689
690 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
691 if (err)
692 break;
693 }
694 rtnl_unlock();
695
696 cb->args[0] = i;
697 return skb->len;
698}
699
700int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
701{
702 int err;
703 char *name;
704 struct sk_buff *rep;
705 struct tipc_bearer *bearer;
706 struct tipc_nl_msg msg;
707 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
708 struct net *net = genl_info_net(info);
709
710 if (!info->attrs[TIPC_NLA_BEARER])
711 return -EINVAL;
712
713 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
714 info->attrs[TIPC_NLA_BEARER],
715 tipc_nl_bearer_policy);
716 if (err)
717 return err;
718
719 if (!attrs[TIPC_NLA_BEARER_NAME])
720 return -EINVAL;
721 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
722
723 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
724 if (!rep)
725 return -ENOMEM;
726
727 msg.skb = rep;
728 msg.portid = info->snd_portid;
729 msg.seq = info->snd_seq;
730
731 rtnl_lock();
732 bearer = tipc_bearer_find(net, name);
733 if (!bearer) {
734 err = -EINVAL;
735 goto err_out;
736 }
737
738 err = __tipc_nl_add_bearer(&msg, bearer, 0);
739 if (err)
740 goto err_out;
741 rtnl_unlock();
742
743 return genlmsg_reply(rep, info);
744err_out:
745 rtnl_unlock();
746 nlmsg_free(rep);
747
748 return err;
749}
750
751int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
752{
753 int err;
754 char *name;
755 struct tipc_bearer *bearer;
756 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
757 struct net *net = sock_net(skb->sk);
758
759 if (!info->attrs[TIPC_NLA_BEARER])
760 return -EINVAL;
761
762 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
763 info->attrs[TIPC_NLA_BEARER],
764 tipc_nl_bearer_policy);
765 if (err)
766 return err;
767
768 if (!attrs[TIPC_NLA_BEARER_NAME])
769 return -EINVAL;
770
771 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
772
773 rtnl_lock();
774 bearer = tipc_bearer_find(net, name);
775 if (!bearer) {
776 rtnl_unlock();
777 return -EINVAL;
778 }
779
780 bearer_disable(net, bearer);
781 rtnl_unlock();
782
783 return 0;
784}
785
786int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
787{
788 int err;
789 char *bearer;
790 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
791 struct net *net = sock_net(skb->sk);
792 struct tipc_net *tn = net_generic(net, tipc_net_id);
793 u32 domain;
794 u32 prio;
795
796 prio = TIPC_MEDIA_LINK_PRI;
797 domain = tn->own_addr & TIPC_CLUSTER_MASK;
798
799 if (!info->attrs[TIPC_NLA_BEARER])
800 return -EINVAL;
801
802 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
803 info->attrs[TIPC_NLA_BEARER],
804 tipc_nl_bearer_policy);
805 if (err)
806 return err;
807
808 if (!attrs[TIPC_NLA_BEARER_NAME])
809 return -EINVAL;
810
811 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
812
813 if (attrs[TIPC_NLA_BEARER_DOMAIN])
814 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
815
816 if (attrs[TIPC_NLA_BEARER_PROP]) {
817 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
818
819 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
820 props);
821 if (err)
822 return err;
823
824 if (props[TIPC_NLA_PROP_PRIO])
825 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
826 }
827
828 rtnl_lock();
829 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
830 if (err) {
831 rtnl_unlock();
832 return err;
833 }
834 rtnl_unlock();
835
836 return 0;
837}
838
839int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
840{
841 int err;
842 char *name;
843 struct tipc_bearer *b;
844 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
845 struct net *net = sock_net(skb->sk);
846
847 if (!info->attrs[TIPC_NLA_BEARER])
848 return -EINVAL;
849
850 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
851 info->attrs[TIPC_NLA_BEARER],
852 tipc_nl_bearer_policy);
853 if (err)
854 return err;
855
856 if (!attrs[TIPC_NLA_BEARER_NAME])
857 return -EINVAL;
858 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
859
860 rtnl_lock();
861 b = tipc_bearer_find(net, name);
862 if (!b) {
863 rtnl_unlock();
864 return -EINVAL;
865 }
866
867 if (attrs[TIPC_NLA_BEARER_PROP]) {
868 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
869
870 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
871 props);
872 if (err) {
873 rtnl_unlock();
874 return err;
875 }
876
877 if (props[TIPC_NLA_PROP_TOL])
878 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
879 if (props[TIPC_NLA_PROP_PRIO])
880 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
881 if (props[TIPC_NLA_PROP_WIN])
882 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
883 }
884 rtnl_unlock();
885
886 return 0;
887}
888
889static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
890 struct tipc_media *media, int nlflags)
891{
892 void *hdr;
893 struct nlattr *attrs;
894 struct nlattr *prop;
895
896 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
897 nlflags, TIPC_NL_MEDIA_GET);
898 if (!hdr)
899 return -EMSGSIZE;
900
901 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
902 if (!attrs)
903 goto msg_full;
904
905 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
906 goto attr_msg_full;
907
908 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
909 if (!prop)
910 goto prop_msg_full;
911 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
912 goto prop_msg_full;
913 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
914 goto prop_msg_full;
915 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
916 goto prop_msg_full;
917
918 nla_nest_end(msg->skb, prop);
919 nla_nest_end(msg->skb, attrs);
920 genlmsg_end(msg->skb, hdr);
921
922 return 0;
923
924prop_msg_full:
925 nla_nest_cancel(msg->skb, prop);
926attr_msg_full:
927 nla_nest_cancel(msg->skb, attrs);
928msg_full:
929 genlmsg_cancel(msg->skb, hdr);
930
931 return -EMSGSIZE;
932}
933
934int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
935{
936 int err;
937 int i = cb->args[0];
938 struct tipc_nl_msg msg;
939
940 if (i == MAX_MEDIA)
941 return 0;
942
943 msg.skb = skb;
944 msg.portid = NETLINK_CB(cb->skb).portid;
945 msg.seq = cb->nlh->nlmsg_seq;
946
947 rtnl_lock();
948 for (; media_info_array[i] != NULL; i++) {
949 err = __tipc_nl_add_media(&msg, media_info_array[i],
950 NLM_F_MULTI);
951 if (err)
952 break;
953 }
954 rtnl_unlock();
955
956 cb->args[0] = i;
957 return skb->len;
958}
959
960int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
961{
962 int err;
963 char *name;
964 struct tipc_nl_msg msg;
965 struct tipc_media *media;
966 struct sk_buff *rep;
967 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
968
969 if (!info->attrs[TIPC_NLA_MEDIA])
970 return -EINVAL;
971
972 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
973 info->attrs[TIPC_NLA_MEDIA],
974 tipc_nl_media_policy);
975 if (err)
976 return err;
977
978 if (!attrs[TIPC_NLA_MEDIA_NAME])
979 return -EINVAL;
980 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
981
982 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
983 if (!rep)
984 return -ENOMEM;
985
986 msg.skb = rep;
987 msg.portid = info->snd_portid;
988 msg.seq = info->snd_seq;
989
990 rtnl_lock();
991 media = tipc_media_find(name);
992 if (!media) {
993 err = -EINVAL;
994 goto err_out;
995 }
996
997 err = __tipc_nl_add_media(&msg, media, 0);
998 if (err)
999 goto err_out;
1000 rtnl_unlock();
1001
1002 return genlmsg_reply(rep, info);
1003err_out:
1004 rtnl_unlock();
1005 nlmsg_free(rep);
1006
1007 return err;
1008}
1009
1010int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1011{
1012 int err;
1013 char *name;
1014 struct tipc_media *m;
1015 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1016
1017 if (!info->attrs[TIPC_NLA_MEDIA])
1018 return -EINVAL;
1019
1020 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1021 info->attrs[TIPC_NLA_MEDIA],
1022 tipc_nl_media_policy);
1023
1024 if (!attrs[TIPC_NLA_MEDIA_NAME])
1025 return -EINVAL;
1026 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1027
1028 rtnl_lock();
1029 m = tipc_media_find(name);
1030 if (!m) {
1031 rtnl_unlock();
1032 return -EINVAL;
1033 }
1034
1035 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1036 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1037
1038 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1039 props);
1040 if (err) {
1041 rtnl_unlock();
1042 return err;
1043 }
1044
1045 if (props[TIPC_NLA_PROP_TOL])
1046 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1047 if (props[TIPC_NLA_PROP_PRIO])
1048 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1049 if (props[TIPC_NLA_PROP_WIN])
1050 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1051 }
1052 rtnl_unlock();
1053
1054 return 0;
1055}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46
47#define MAX_ADDR_STR 60
48
49static struct tipc_media * const media_info_array[] = {
50 ð_media_info,
51#ifdef CONFIG_TIPC_MEDIA_IB
52 &ib_media_info,
53#endif
54#ifdef CONFIG_TIPC_MEDIA_UDP
55 &udp_media_info,
56#endif
57 NULL
58};
59
60static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
61{
62 struct tipc_net *tn = tipc_net(net);
63
64 return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
65}
66
67static void bearer_disable(struct net *net, struct tipc_bearer *b);
68static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
69 struct packet_type *pt, struct net_device *orig_dev);
70
71/**
72 * tipc_media_find - locates specified media object by name
73 */
74struct tipc_media *tipc_media_find(const char *name)
75{
76 u32 i;
77
78 for (i = 0; media_info_array[i] != NULL; i++) {
79 if (!strcmp(media_info_array[i]->name, name))
80 break;
81 }
82 return media_info_array[i];
83}
84
85/**
86 * media_find_id - locates specified media object by type identifier
87 */
88static struct tipc_media *media_find_id(u8 type)
89{
90 u32 i;
91
92 for (i = 0; media_info_array[i] != NULL; i++) {
93 if (media_info_array[i]->type_id == type)
94 break;
95 }
96 return media_info_array[i];
97}
98
99/**
100 * tipc_media_addr_printf - record media address in print buffer
101 */
102void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
103{
104 char addr_str[MAX_ADDR_STR];
105 struct tipc_media *m;
106 int ret;
107
108 m = media_find_id(a->media_id);
109
110 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
111 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
112 else {
113 u32 i;
114
115 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
116 for (i = 0; i < sizeof(a->value); i++)
117 ret += scnprintf(buf - ret, len + ret,
118 "-%02x", a->value[i]);
119 }
120}
121
122/**
123 * bearer_name_validate - validate & (optionally) deconstruct bearer name
124 * @name: ptr to bearer name string
125 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
126 *
127 * Returns 1 if bearer name is valid, otherwise 0.
128 */
129static int bearer_name_validate(const char *name,
130 struct tipc_bearer_names *name_parts)
131{
132 char name_copy[TIPC_MAX_BEARER_NAME];
133 char *media_name;
134 char *if_name;
135 u32 media_len;
136 u32 if_len;
137
138 /* copy bearer name & ensure length is OK */
139 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
140 /* need above in case non-Posix strncpy() doesn't pad with nulls */
141 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
142 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
143 return 0;
144
145 /* ensure all component parts of bearer name are present */
146 media_name = name_copy;
147 if_name = strchr(media_name, ':');
148 if (if_name == NULL)
149 return 0;
150 *(if_name++) = 0;
151 media_len = if_name - media_name;
152 if_len = strlen(if_name) + 1;
153
154 /* validate component parts of bearer name */
155 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
156 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
157 return 0;
158
159 /* return bearer name components, if necessary */
160 if (name_parts) {
161 strcpy(name_parts->media_name, media_name);
162 strcpy(name_parts->if_name, if_name);
163 }
164 return 1;
165}
166
167/**
168 * tipc_bearer_find - locates bearer object with matching bearer name
169 */
170struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
171{
172 struct tipc_net *tn = net_generic(net, tipc_net_id);
173 struct tipc_bearer *b;
174 u32 i;
175
176 for (i = 0; i < MAX_BEARERS; i++) {
177 b = rtnl_dereference(tn->bearer_list[i]);
178 if (b && (!strcmp(b->name, name)))
179 return b;
180 }
181 return NULL;
182}
183
184/* tipc_bearer_get_name - get the bearer name from its id.
185 * @net: network namespace
186 * @name: a pointer to the buffer where the name will be stored.
187 * @bearer_id: the id to get the name from.
188 */
189int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
190{
191 struct tipc_net *tn = tipc_net(net);
192 struct tipc_bearer *b;
193
194 if (bearer_id >= MAX_BEARERS)
195 return -EINVAL;
196
197 b = rtnl_dereference(tn->bearer_list[bearer_id]);
198 if (!b)
199 return -EINVAL;
200
201 strcpy(name, b->name);
202 return 0;
203}
204
205void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
206{
207 struct tipc_net *tn = net_generic(net, tipc_net_id);
208 struct tipc_bearer *b;
209
210 rcu_read_lock();
211 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
212 if (b)
213 tipc_disc_add_dest(b->disc);
214 rcu_read_unlock();
215}
216
217void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
218{
219 struct tipc_net *tn = net_generic(net, tipc_net_id);
220 struct tipc_bearer *b;
221
222 rcu_read_lock();
223 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
224 if (b)
225 tipc_disc_remove_dest(b->disc);
226 rcu_read_unlock();
227}
228
229/**
230 * tipc_enable_bearer - enable bearer with the given name
231 */
232static int tipc_enable_bearer(struct net *net, const char *name,
233 u32 disc_domain, u32 prio,
234 struct nlattr *attr[])
235{
236 struct tipc_net *tn = tipc_net(net);
237 struct tipc_bearer_names b_names;
238 int with_this_prio = 1;
239 struct tipc_bearer *b;
240 struct tipc_media *m;
241 struct sk_buff *skb;
242 int bearer_id = 0;
243 int res = -EINVAL;
244 char *errstr = "";
245
246 if (!bearer_name_validate(name, &b_names)) {
247 errstr = "illegal name";
248 goto rejected;
249 }
250
251 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
252 errstr = "illegal priority";
253 goto rejected;
254 }
255
256 m = tipc_media_find(b_names.media_name);
257 if (!m) {
258 errstr = "media not registered";
259 goto rejected;
260 }
261
262 if (prio == TIPC_MEDIA_LINK_PRI)
263 prio = m->priority;
264
265 /* Check new bearer vs existing ones and find free bearer id if any */
266 while (bearer_id < MAX_BEARERS) {
267 b = rtnl_dereference(tn->bearer_list[bearer_id]);
268 if (!b)
269 break;
270 if (!strcmp(name, b->name)) {
271 errstr = "already enabled";
272 goto rejected;
273 }
274 bearer_id++;
275 if (b->priority != prio)
276 continue;
277 if (++with_this_prio <= 2)
278 continue;
279 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
280 name, prio);
281 if (prio == TIPC_MIN_LINK_PRI) {
282 errstr = "cannot adjust to lower";
283 goto rejected;
284 }
285 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
286 prio--;
287 bearer_id = 0;
288 with_this_prio = 1;
289 }
290
291 if (bearer_id >= MAX_BEARERS) {
292 errstr = "max 3 bearers permitted";
293 goto rejected;
294 }
295
296 b = kzalloc(sizeof(*b), GFP_ATOMIC);
297 if (!b)
298 return -ENOMEM;
299
300 strcpy(b->name, name);
301 b->media = m;
302 res = m->enable_media(net, b, attr);
303 if (res) {
304 kfree(b);
305 errstr = "failed to enable media";
306 goto rejected;
307 }
308
309 b->identity = bearer_id;
310 b->tolerance = m->tolerance;
311 b->window = m->window;
312 b->domain = disc_domain;
313 b->net_plane = bearer_id + 'A';
314 b->priority = prio;
315 test_and_set_bit_lock(0, &b->up);
316
317 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
318 if (res) {
319 bearer_disable(net, b);
320 kfree(b);
321 errstr = "failed to create discoverer";
322 goto rejected;
323 }
324
325 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
326 if (skb)
327 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
328
329 if (tipc_mon_create(net, bearer_id)) {
330 bearer_disable(net, b);
331 return -ENOMEM;
332 }
333
334 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
335
336 return res;
337rejected:
338 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
339 return res;
340}
341
342/**
343 * tipc_reset_bearer - Reset all links established over this bearer
344 */
345static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
346{
347 pr_info("Resetting bearer <%s>\n", b->name);
348 tipc_node_delete_links(net, b->identity);
349 tipc_disc_reset(net, b);
350 return 0;
351}
352
353/**
354 * bearer_disable
355 *
356 * Note: This routine assumes caller holds RTNL lock.
357 */
358static void bearer_disable(struct net *net, struct tipc_bearer *b)
359{
360 struct tipc_net *tn = tipc_net(net);
361 int bearer_id = b->identity;
362
363 pr_info("Disabling bearer <%s>\n", b->name);
364 clear_bit_unlock(0, &b->up);
365 tipc_node_delete_links(net, bearer_id);
366 b->media->disable_media(b);
367 RCU_INIT_POINTER(b->media_ptr, NULL);
368 if (b->disc)
369 tipc_disc_delete(b->disc);
370 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
371 kfree_rcu(b, rcu);
372 tipc_mon_delete(net, bearer_id);
373}
374
375int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
376 struct nlattr *attr[])
377{
378 char *dev_name = strchr((const char *)b->name, ':') + 1;
379 int hwaddr_len = b->media->hwaddr_len;
380 u8 node_id[NODE_ID_LEN] = {0,};
381 struct net_device *dev;
382
383 /* Find device with specified name */
384 dev = dev_get_by_name(net, dev_name);
385 if (!dev)
386 return -ENODEV;
387 if (tipc_mtu_bad(dev, 0)) {
388 dev_put(dev);
389 return -EINVAL;
390 }
391
392 /* Autoconfigure own node identity if needed */
393 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
394 memcpy(node_id, dev->dev_addr, hwaddr_len);
395 tipc_net_init(net, node_id, 0);
396 }
397 if (!tipc_own_id(net)) {
398 pr_warn("Failed to obtain node identity\n");
399 return -EINVAL;
400 }
401
402 /* Associate TIPC bearer with L2 bearer */
403 rcu_assign_pointer(b->media_ptr, dev);
404 b->pt.dev = dev;
405 b->pt.type = htons(ETH_P_TIPC);
406 b->pt.func = tipc_l2_rcv_msg;
407 dev_add_pack(&b->pt);
408 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
409 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
410 b->bcast_addr.media_id = b->media->type_id;
411 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
412 b->mtu = dev->mtu;
413 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
414 rcu_assign_pointer(dev->tipc_ptr, b);
415 return 0;
416}
417
418/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
419 *
420 * Mark L2 bearer as inactive so that incoming buffers are thrown away
421 */
422void tipc_disable_l2_media(struct tipc_bearer *b)
423{
424 struct net_device *dev;
425
426 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
427 dev_remove_pack(&b->pt);
428 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
429 synchronize_net();
430 dev_put(dev);
431}
432
433/**
434 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
435 * @skb: the packet to be sent
436 * @b: the bearer through which the packet is to be sent
437 * @dest: peer destination address
438 */
439int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
440 struct tipc_bearer *b, struct tipc_media_addr *dest)
441{
442 struct net_device *dev;
443 int delta;
444
445 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
446 if (!dev)
447 return 0;
448
449 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
450 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
451 kfree_skb(skb);
452 return 0;
453 }
454 skb_reset_network_header(skb);
455 skb->dev = dev;
456 skb->protocol = htons(ETH_P_TIPC);
457 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
458 dev->dev_addr, skb->len);
459 dev_queue_xmit(skb);
460 return 0;
461}
462
463bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
464{
465 bool supp = false;
466 struct tipc_bearer *b;
467
468 rcu_read_lock();
469 b = bearer_get(net, bearer_id);
470 if (b)
471 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
472 rcu_read_unlock();
473 return supp;
474}
475
476int tipc_bearer_mtu(struct net *net, u32 bearer_id)
477{
478 int mtu = 0;
479 struct tipc_bearer *b;
480
481 rcu_read_lock();
482 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
483 if (b)
484 mtu = b->mtu;
485 rcu_read_unlock();
486 return mtu;
487}
488
489/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
490 */
491void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
492 struct sk_buff *skb,
493 struct tipc_media_addr *dest)
494{
495 struct tipc_msg *hdr = buf_msg(skb);
496 struct tipc_bearer *b;
497
498 rcu_read_lock();
499 b = bearer_get(net, bearer_id);
500 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
501 b->media->send_msg(net, skb, b, dest);
502 else
503 kfree_skb(skb);
504 rcu_read_unlock();
505}
506
507/* tipc_bearer_xmit() -send buffer to destination over bearer
508 */
509void tipc_bearer_xmit(struct net *net, u32 bearer_id,
510 struct sk_buff_head *xmitq,
511 struct tipc_media_addr *dst)
512{
513 struct tipc_bearer *b;
514 struct sk_buff *skb, *tmp;
515
516 if (skb_queue_empty(xmitq))
517 return;
518
519 rcu_read_lock();
520 b = bearer_get(net, bearer_id);
521 if (unlikely(!b))
522 __skb_queue_purge(xmitq);
523 skb_queue_walk_safe(xmitq, skb, tmp) {
524 __skb_dequeue(xmitq);
525 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
526 b->media->send_msg(net, skb, b, dst);
527 else
528 kfree_skb(skb);
529 }
530 rcu_read_unlock();
531}
532
533/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
534 */
535void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
536 struct sk_buff_head *xmitq)
537{
538 struct tipc_net *tn = tipc_net(net);
539 int net_id = tn->net_id;
540 struct tipc_bearer *b;
541 struct sk_buff *skb, *tmp;
542 struct tipc_msg *hdr;
543
544 rcu_read_lock();
545 b = bearer_get(net, bearer_id);
546 if (unlikely(!b || !test_bit(0, &b->up)))
547 __skb_queue_purge(xmitq);
548 skb_queue_walk_safe(xmitq, skb, tmp) {
549 hdr = buf_msg(skb);
550 msg_set_non_seq(hdr, 1);
551 msg_set_mc_netid(hdr, net_id);
552 __skb_dequeue(xmitq);
553 b->media->send_msg(net, skb, b, &b->bcast_addr);
554 }
555 rcu_read_unlock();
556}
557
558/**
559 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
560 * @buf: the received packet
561 * @dev: the net device that the packet was received on
562 * @pt: the packet_type structure which was used to register this handler
563 * @orig_dev: the original receive net device in case the device is a bond
564 *
565 * Accept only packets explicitly sent to this node, or broadcast packets;
566 * ignores packets sent using interface multicast, and traffic sent to other
567 * nodes (which can happen if interface is running in promiscuous mode).
568 */
569static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
570 struct packet_type *pt, struct net_device *orig_dev)
571{
572 struct tipc_bearer *b;
573
574 rcu_read_lock();
575 b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
576 rcu_dereference_rtnl(orig_dev->tipc_ptr);
577 if (likely(b && test_bit(0, &b->up) &&
578 (skb->pkt_type <= PACKET_MULTICAST))) {
579 skb->next = NULL;
580 tipc_rcv(dev_net(b->pt.dev), skb, b);
581 rcu_read_unlock();
582 return NET_RX_SUCCESS;
583 }
584 rcu_read_unlock();
585 kfree_skb(skb);
586 return NET_RX_DROP;
587}
588
589/**
590 * tipc_l2_device_event - handle device events from network device
591 * @nb: the context of the notification
592 * @evt: the type of event
593 * @ptr: the net device that the event was on
594 *
595 * This function is called by the Ethernet driver in case of link
596 * change event.
597 */
598static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
599 void *ptr)
600{
601 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
602 struct net *net = dev_net(dev);
603 struct tipc_bearer *b;
604
605 b = rtnl_dereference(dev->tipc_ptr);
606 if (!b)
607 return NOTIFY_DONE;
608
609 switch (evt) {
610 case NETDEV_CHANGE:
611 if (netif_carrier_ok(dev))
612 break;
613 case NETDEV_UP:
614 test_and_set_bit_lock(0, &b->up);
615 break;
616 case NETDEV_GOING_DOWN:
617 clear_bit_unlock(0, &b->up);
618 tipc_reset_bearer(net, b);
619 break;
620 case NETDEV_CHANGEMTU:
621 if (tipc_mtu_bad(dev, 0)) {
622 bearer_disable(net, b);
623 break;
624 }
625 b->mtu = dev->mtu;
626 tipc_reset_bearer(net, b);
627 break;
628 case NETDEV_CHANGEADDR:
629 b->media->raw2addr(b, &b->addr,
630 (char *)dev->dev_addr);
631 tipc_reset_bearer(net, b);
632 break;
633 case NETDEV_UNREGISTER:
634 case NETDEV_CHANGENAME:
635 bearer_disable(net, b);
636 break;
637 }
638 return NOTIFY_OK;
639}
640
641static struct notifier_block notifier = {
642 .notifier_call = tipc_l2_device_event,
643 .priority = 0,
644};
645
646int tipc_bearer_setup(void)
647{
648 return register_netdevice_notifier(¬ifier);
649}
650
651void tipc_bearer_cleanup(void)
652{
653 unregister_netdevice_notifier(¬ifier);
654}
655
656void tipc_bearer_stop(struct net *net)
657{
658 struct tipc_net *tn = net_generic(net, tipc_net_id);
659 struct tipc_bearer *b;
660 u32 i;
661
662 for (i = 0; i < MAX_BEARERS; i++) {
663 b = rtnl_dereference(tn->bearer_list[i]);
664 if (b) {
665 bearer_disable(net, b);
666 tn->bearer_list[i] = NULL;
667 }
668 }
669}
670
671/* Caller should hold rtnl_lock to protect the bearer */
672static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
673 struct tipc_bearer *bearer, int nlflags)
674{
675 void *hdr;
676 struct nlattr *attrs;
677 struct nlattr *prop;
678
679 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
680 nlflags, TIPC_NL_BEARER_GET);
681 if (!hdr)
682 return -EMSGSIZE;
683
684 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
685 if (!attrs)
686 goto msg_full;
687
688 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
689 goto attr_msg_full;
690
691 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
692 if (!prop)
693 goto prop_msg_full;
694 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
695 goto prop_msg_full;
696 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
697 goto prop_msg_full;
698 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
699 goto prop_msg_full;
700
701 nla_nest_end(msg->skb, prop);
702
703#ifdef CONFIG_TIPC_MEDIA_UDP
704 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
705 if (tipc_udp_nl_add_bearer_data(msg, bearer))
706 goto attr_msg_full;
707 }
708#endif
709
710 nla_nest_end(msg->skb, attrs);
711 genlmsg_end(msg->skb, hdr);
712
713 return 0;
714
715prop_msg_full:
716 nla_nest_cancel(msg->skb, prop);
717attr_msg_full:
718 nla_nest_cancel(msg->skb, attrs);
719msg_full:
720 genlmsg_cancel(msg->skb, hdr);
721
722 return -EMSGSIZE;
723}
724
725int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
726{
727 int err;
728 int i = cb->args[0];
729 struct tipc_bearer *bearer;
730 struct tipc_nl_msg msg;
731 struct net *net = sock_net(skb->sk);
732 struct tipc_net *tn = net_generic(net, tipc_net_id);
733
734 if (i == MAX_BEARERS)
735 return 0;
736
737 msg.skb = skb;
738 msg.portid = NETLINK_CB(cb->skb).portid;
739 msg.seq = cb->nlh->nlmsg_seq;
740
741 rtnl_lock();
742 for (i = 0; i < MAX_BEARERS; i++) {
743 bearer = rtnl_dereference(tn->bearer_list[i]);
744 if (!bearer)
745 continue;
746
747 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
748 if (err)
749 break;
750 }
751 rtnl_unlock();
752
753 cb->args[0] = i;
754 return skb->len;
755}
756
757int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
758{
759 int err;
760 char *name;
761 struct sk_buff *rep;
762 struct tipc_bearer *bearer;
763 struct tipc_nl_msg msg;
764 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
765 struct net *net = genl_info_net(info);
766
767 if (!info->attrs[TIPC_NLA_BEARER])
768 return -EINVAL;
769
770 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
771 info->attrs[TIPC_NLA_BEARER],
772 tipc_nl_bearer_policy, info->extack);
773 if (err)
774 return err;
775
776 if (!attrs[TIPC_NLA_BEARER_NAME])
777 return -EINVAL;
778 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
779
780 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
781 if (!rep)
782 return -ENOMEM;
783
784 msg.skb = rep;
785 msg.portid = info->snd_portid;
786 msg.seq = info->snd_seq;
787
788 rtnl_lock();
789 bearer = tipc_bearer_find(net, name);
790 if (!bearer) {
791 err = -EINVAL;
792 goto err_out;
793 }
794
795 err = __tipc_nl_add_bearer(&msg, bearer, 0);
796 if (err)
797 goto err_out;
798 rtnl_unlock();
799
800 return genlmsg_reply(rep, info);
801err_out:
802 rtnl_unlock();
803 nlmsg_free(rep);
804
805 return err;
806}
807
808int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
809{
810 int err;
811 char *name;
812 struct tipc_bearer *bearer;
813 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
814 struct net *net = sock_net(skb->sk);
815
816 if (!info->attrs[TIPC_NLA_BEARER])
817 return -EINVAL;
818
819 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
820 info->attrs[TIPC_NLA_BEARER],
821 tipc_nl_bearer_policy, info->extack);
822 if (err)
823 return err;
824
825 if (!attrs[TIPC_NLA_BEARER_NAME])
826 return -EINVAL;
827
828 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
829
830 bearer = tipc_bearer_find(net, name);
831 if (!bearer)
832 return -EINVAL;
833
834 bearer_disable(net, bearer);
835
836 return 0;
837}
838
839int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
840{
841 int err;
842
843 rtnl_lock();
844 err = __tipc_nl_bearer_disable(skb, info);
845 rtnl_unlock();
846
847 return err;
848}
849
850int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
851{
852 int err;
853 char *bearer;
854 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
855 struct net *net = sock_net(skb->sk);
856 u32 domain = 0;
857 u32 prio;
858
859 prio = TIPC_MEDIA_LINK_PRI;
860
861 if (!info->attrs[TIPC_NLA_BEARER])
862 return -EINVAL;
863
864 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
865 info->attrs[TIPC_NLA_BEARER],
866 tipc_nl_bearer_policy, info->extack);
867 if (err)
868 return err;
869
870 if (!attrs[TIPC_NLA_BEARER_NAME])
871 return -EINVAL;
872
873 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
874
875 if (attrs[TIPC_NLA_BEARER_DOMAIN])
876 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
877
878 if (attrs[TIPC_NLA_BEARER_PROP]) {
879 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
880
881 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
882 props);
883 if (err)
884 return err;
885
886 if (props[TIPC_NLA_PROP_PRIO])
887 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
888 }
889
890 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
891}
892
893int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
894{
895 int err;
896
897 rtnl_lock();
898 err = __tipc_nl_bearer_enable(skb, info);
899 rtnl_unlock();
900
901 return err;
902}
903
904int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
905{
906 int err;
907 char *name;
908 struct tipc_bearer *b;
909 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
910 struct net *net = sock_net(skb->sk);
911
912 if (!info->attrs[TIPC_NLA_BEARER])
913 return -EINVAL;
914
915 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
916 info->attrs[TIPC_NLA_BEARER],
917 tipc_nl_bearer_policy, info->extack);
918 if (err)
919 return err;
920
921 if (!attrs[TIPC_NLA_BEARER_NAME])
922 return -EINVAL;
923 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
924
925 rtnl_lock();
926 b = tipc_bearer_find(net, name);
927 if (!b) {
928 rtnl_unlock();
929 return -EINVAL;
930 }
931
932#ifdef CONFIG_TIPC_MEDIA_UDP
933 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
934 err = tipc_udp_nl_bearer_add(b,
935 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
936 if (err) {
937 rtnl_unlock();
938 return err;
939 }
940 }
941#endif
942 rtnl_unlock();
943
944 return 0;
945}
946
947int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
948{
949 struct tipc_bearer *b;
950 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
951 struct net *net = sock_net(skb->sk);
952 char *name;
953 int err;
954
955 if (!info->attrs[TIPC_NLA_BEARER])
956 return -EINVAL;
957
958 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
959 info->attrs[TIPC_NLA_BEARER],
960 tipc_nl_bearer_policy, info->extack);
961 if (err)
962 return err;
963
964 if (!attrs[TIPC_NLA_BEARER_NAME])
965 return -EINVAL;
966 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
967
968 b = tipc_bearer_find(net, name);
969 if (!b)
970 return -EINVAL;
971
972 if (attrs[TIPC_NLA_BEARER_PROP]) {
973 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
974
975 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
976 props);
977 if (err)
978 return err;
979
980 if (props[TIPC_NLA_PROP_TOL]) {
981 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
982 tipc_node_apply_tolerance(net, b);
983 }
984 if (props[TIPC_NLA_PROP_PRIO])
985 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
986 if (props[TIPC_NLA_PROP_WIN])
987 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
988 }
989
990 return 0;
991}
992
993int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
994{
995 int err;
996
997 rtnl_lock();
998 err = __tipc_nl_bearer_set(skb, info);
999 rtnl_unlock();
1000
1001 return err;
1002}
1003
1004static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1005 struct tipc_media *media, int nlflags)
1006{
1007 void *hdr;
1008 struct nlattr *attrs;
1009 struct nlattr *prop;
1010
1011 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1012 nlflags, TIPC_NL_MEDIA_GET);
1013 if (!hdr)
1014 return -EMSGSIZE;
1015
1016 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1017 if (!attrs)
1018 goto msg_full;
1019
1020 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1021 goto attr_msg_full;
1022
1023 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1024 if (!prop)
1025 goto prop_msg_full;
1026 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1027 goto prop_msg_full;
1028 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1029 goto prop_msg_full;
1030 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1031 goto prop_msg_full;
1032
1033 nla_nest_end(msg->skb, prop);
1034 nla_nest_end(msg->skb, attrs);
1035 genlmsg_end(msg->skb, hdr);
1036
1037 return 0;
1038
1039prop_msg_full:
1040 nla_nest_cancel(msg->skb, prop);
1041attr_msg_full:
1042 nla_nest_cancel(msg->skb, attrs);
1043msg_full:
1044 genlmsg_cancel(msg->skb, hdr);
1045
1046 return -EMSGSIZE;
1047}
1048
1049int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1050{
1051 int err;
1052 int i = cb->args[0];
1053 struct tipc_nl_msg msg;
1054
1055 if (i == MAX_MEDIA)
1056 return 0;
1057
1058 msg.skb = skb;
1059 msg.portid = NETLINK_CB(cb->skb).portid;
1060 msg.seq = cb->nlh->nlmsg_seq;
1061
1062 rtnl_lock();
1063 for (; media_info_array[i] != NULL; i++) {
1064 err = __tipc_nl_add_media(&msg, media_info_array[i],
1065 NLM_F_MULTI);
1066 if (err)
1067 break;
1068 }
1069 rtnl_unlock();
1070
1071 cb->args[0] = i;
1072 return skb->len;
1073}
1074
1075int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1076{
1077 int err;
1078 char *name;
1079 struct tipc_nl_msg msg;
1080 struct tipc_media *media;
1081 struct sk_buff *rep;
1082 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1083
1084 if (!info->attrs[TIPC_NLA_MEDIA])
1085 return -EINVAL;
1086
1087 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1088 info->attrs[TIPC_NLA_MEDIA],
1089 tipc_nl_media_policy, info->extack);
1090 if (err)
1091 return err;
1092
1093 if (!attrs[TIPC_NLA_MEDIA_NAME])
1094 return -EINVAL;
1095 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1096
1097 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1098 if (!rep)
1099 return -ENOMEM;
1100
1101 msg.skb = rep;
1102 msg.portid = info->snd_portid;
1103 msg.seq = info->snd_seq;
1104
1105 rtnl_lock();
1106 media = tipc_media_find(name);
1107 if (!media) {
1108 err = -EINVAL;
1109 goto err_out;
1110 }
1111
1112 err = __tipc_nl_add_media(&msg, media, 0);
1113 if (err)
1114 goto err_out;
1115 rtnl_unlock();
1116
1117 return genlmsg_reply(rep, info);
1118err_out:
1119 rtnl_unlock();
1120 nlmsg_free(rep);
1121
1122 return err;
1123}
1124
1125int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1126{
1127 int err;
1128 char *name;
1129 struct tipc_media *m;
1130 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1131
1132 if (!info->attrs[TIPC_NLA_MEDIA])
1133 return -EINVAL;
1134
1135 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1136 info->attrs[TIPC_NLA_MEDIA],
1137 tipc_nl_media_policy, info->extack);
1138
1139 if (!attrs[TIPC_NLA_MEDIA_NAME])
1140 return -EINVAL;
1141 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1142
1143 m = tipc_media_find(name);
1144 if (!m)
1145 return -EINVAL;
1146
1147 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1148 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1149
1150 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1151 props);
1152 if (err)
1153 return err;
1154
1155 if (props[TIPC_NLA_PROP_TOL])
1156 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1157 if (props[TIPC_NLA_PROP_PRIO])
1158 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1159 if (props[TIPC_NLA_PROP_WIN])
1160 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1161 }
1162
1163 return 0;
1164}
1165
1166int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1167{
1168 int err;
1169
1170 rtnl_lock();
1171 err = __tipc_nl_media_set(skb, info);
1172 rtnl_unlock();
1173
1174 return err;
1175}