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