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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#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 */
76struct tipc_media *tipc_media_find(const char *name)
77{
78 u32 i;
79
80 for (i = 0; media_info_array[i] != NULL; i++) {
81 if (!strcmp(media_info_array[i]->name, name))
82 break;
83 }
84 return media_info_array[i];
85}
86
87/**
88 * media_find_id - locates specified media object by type identifier
89 */
90static struct tipc_media *media_find_id(u8 type)
91{
92 u32 i;
93
94 for (i = 0; media_info_array[i] != NULL; i++) {
95 if (media_info_array[i]->type_id == type)
96 break;
97 }
98 return media_info_array[i];
99}
100
101/**
102 * tipc_media_addr_printf - record media address in print buffer
103 */
104int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
105{
106 char addr_str[MAX_ADDR_STR];
107 struct tipc_media *m;
108 int ret;
109
110 m = media_find_id(a->media_id);
111
112 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
113 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
114 else {
115 u32 i;
116
117 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
118 for (i = 0; i < sizeof(a->value); i++)
119 ret += scnprintf(buf + ret, len - ret,
120 "-%x", a->value[i]);
121 }
122 return ret;
123}
124
125/**
126 * bearer_name_validate - validate & (optionally) deconstruct bearer name
127 * @name: ptr to bearer name string
128 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
129 *
130 * Returns 1 if bearer name is valid, otherwise 0.
131 */
132static int bearer_name_validate(const char *name,
133 struct tipc_bearer_names *name_parts)
134{
135 char name_copy[TIPC_MAX_BEARER_NAME];
136 char *media_name;
137 char *if_name;
138 u32 media_len;
139 u32 if_len;
140
141 /* copy bearer name & ensure length is OK */
142 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
143 /* need above in case non-Posix strncpy() doesn't pad with nulls */
144 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
145 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
146 return 0;
147
148 /* ensure all component parts of bearer name are present */
149 media_name = name_copy;
150 if_name = strchr(media_name, ':');
151 if (if_name == NULL)
152 return 0;
153 *(if_name++) = 0;
154 media_len = if_name - media_name;
155 if_len = strlen(if_name) + 1;
156
157 /* validate component parts of bearer name */
158 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
159 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
160 return 0;
161
162 /* return bearer name components, if necessary */
163 if (name_parts) {
164 strcpy(name_parts->media_name, media_name);
165 strcpy(name_parts->if_name, if_name);
166 }
167 return 1;
168}
169
170/**
171 * tipc_bearer_find - locates bearer object with matching bearer name
172 */
173struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b;
177 u32 i;
178
179 for (i = 0; i < MAX_BEARERS; i++) {
180 b = rtnl_dereference(tn->bearer_list[i]);
181 if (b && (!strcmp(b->name, name)))
182 return b;
183 }
184 return NULL;
185}
186
187/* tipc_bearer_get_name - get the bearer name from its id.
188 * @net: network namespace
189 * @name: a pointer to the buffer where the name will be stored.
190 * @bearer_id: the id to get the name from.
191 */
192int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
193{
194 struct tipc_net *tn = tipc_net(net);
195 struct tipc_bearer *b;
196
197 if (bearer_id >= MAX_BEARERS)
198 return -EINVAL;
199
200 b = rtnl_dereference(tn->bearer_list[bearer_id]);
201 if (!b)
202 return -EINVAL;
203
204 strcpy(name, b->name);
205 return 0;
206}
207
208void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
209{
210 struct tipc_net *tn = net_generic(net, tipc_net_id);
211 struct tipc_bearer *b;
212
213 rcu_read_lock();
214 b = rcu_dereference(tn->bearer_list[bearer_id]);
215 if (b)
216 tipc_disc_add_dest(b->disc);
217 rcu_read_unlock();
218}
219
220void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
221{
222 struct tipc_net *tn = net_generic(net, tipc_net_id);
223 struct tipc_bearer *b;
224
225 rcu_read_lock();
226 b = rcu_dereference(tn->bearer_list[bearer_id]);
227 if (b)
228 tipc_disc_remove_dest(b->disc);
229 rcu_read_unlock();
230}
231
232/**
233 * tipc_enable_bearer - enable bearer with the given name
234 */
235static int tipc_enable_bearer(struct net *net, const char *name,
236 u32 disc_domain, u32 prio,
237 struct nlattr *attr[])
238{
239 struct tipc_net *tn = tipc_net(net);
240 struct tipc_bearer_names b_names;
241 int with_this_prio = 1;
242 struct tipc_bearer *b;
243 struct tipc_media *m;
244 struct sk_buff *skb;
245 int bearer_id = 0;
246 int res = -EINVAL;
247 char *errstr = "";
248
249 if (!bearer_name_validate(name, &b_names)) {
250 errstr = "illegal name";
251 goto rejected;
252 }
253
254 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
255 errstr = "illegal priority";
256 goto rejected;
257 }
258
259 m = tipc_media_find(b_names.media_name);
260 if (!m) {
261 errstr = "media not registered";
262 goto rejected;
263 }
264
265 if (prio == TIPC_MEDIA_LINK_PRI)
266 prio = m->priority;
267
268 /* Check new bearer vs existing ones and find free bearer id if any */
269 while (bearer_id < MAX_BEARERS) {
270 b = rtnl_dereference(tn->bearer_list[bearer_id]);
271 if (!b)
272 break;
273 if (!strcmp(name, b->name)) {
274 errstr = "already enabled";
275 goto rejected;
276 }
277 bearer_id++;
278 if (b->priority != prio)
279 continue;
280 if (++with_this_prio <= 2)
281 continue;
282 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
283 name, prio);
284 if (prio == TIPC_MIN_LINK_PRI) {
285 errstr = "cannot adjust to lower";
286 goto rejected;
287 }
288 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
289 prio--;
290 bearer_id = 0;
291 with_this_prio = 1;
292 }
293
294 if (bearer_id >= MAX_BEARERS) {
295 errstr = "max 3 bearers permitted";
296 goto rejected;
297 }
298
299 b = kzalloc(sizeof(*b), GFP_ATOMIC);
300 if (!b)
301 return -ENOMEM;
302
303 strcpy(b->name, name);
304 b->media = m;
305 res = m->enable_media(net, b, attr);
306 if (res) {
307 kfree(b);
308 errstr = "failed to enable media";
309 goto rejected;
310 }
311
312 b->identity = bearer_id;
313 b->tolerance = m->tolerance;
314 b->min_win = m->min_win;
315 b->max_win = m->max_win;
316 b->domain = disc_domain;
317 b->net_plane = bearer_id + 'A';
318 b->priority = prio;
319 refcount_set(&b->refcnt, 1);
320
321 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
322 if (res) {
323 bearer_disable(net, b);
324 errstr = "failed to create discoverer";
325 goto rejected;
326 }
327
328 test_and_set_bit_lock(0, &b->up);
329 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
330 if (skb)
331 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
332
333 if (tipc_mon_create(net, bearer_id)) {
334 bearer_disable(net, b);
335 return -ENOMEM;
336 }
337
338 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
339
340 return res;
341rejected:
342 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
343 return res;
344}
345
346/**
347 * tipc_reset_bearer - Reset all links established over this bearer
348 */
349static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
350{
351 pr_info("Resetting bearer <%s>\n", b->name);
352 tipc_node_delete_links(net, b->identity);
353 tipc_disc_reset(net, b);
354 return 0;
355}
356
357bool tipc_bearer_hold(struct tipc_bearer *b)
358{
359 return (b && refcount_inc_not_zero(&b->refcnt));
360}
361
362void tipc_bearer_put(struct tipc_bearer *b)
363{
364 if (b && refcount_dec_and_test(&b->refcnt))
365 kfree_rcu(b, rcu);
366}
367
368/**
369 * bearer_disable
370 *
371 * Note: This routine assumes caller holds RTNL lock.
372 */
373static void bearer_disable(struct net *net, struct tipc_bearer *b)
374{
375 struct tipc_net *tn = tipc_net(net);
376 int bearer_id = b->identity;
377
378 pr_info("Disabling bearer <%s>\n", b->name);
379 clear_bit_unlock(0, &b->up);
380 tipc_node_delete_links(net, bearer_id);
381 b->media->disable_media(b);
382 RCU_INIT_POINTER(b->media_ptr, NULL);
383 if (b->disc)
384 tipc_disc_delete(b->disc);
385 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
386 tipc_bearer_put(b);
387 tipc_mon_delete(net, bearer_id);
388}
389
390int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
391 struct nlattr *attr[])
392{
393 char *dev_name = strchr((const char *)b->name, ':') + 1;
394 int hwaddr_len = b->media->hwaddr_len;
395 u8 node_id[NODE_ID_LEN] = {0,};
396 struct net_device *dev;
397
398 /* Find device with specified name */
399 dev = dev_get_by_name(net, dev_name);
400 if (!dev)
401 return -ENODEV;
402 if (tipc_mtu_bad(dev, 0)) {
403 dev_put(dev);
404 return -EINVAL;
405 }
406 if (dev == net->loopback_dev) {
407 dev_put(dev);
408 pr_info("Enabling <%s> not permitted\n", b->name);
409 return -EINVAL;
410 }
411
412 /* Autoconfigure own node identity if needed */
413 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
414 memcpy(node_id, dev->dev_addr, hwaddr_len);
415 tipc_net_init(net, node_id, 0);
416 }
417 if (!tipc_own_id(net)) {
418 dev_put(dev);
419 pr_warn("Failed to obtain node identity\n");
420 return -EINVAL;
421 }
422
423 /* Associate TIPC bearer with L2 bearer */
424 rcu_assign_pointer(b->media_ptr, dev);
425 b->pt.dev = dev;
426 b->pt.type = htons(ETH_P_TIPC);
427 b->pt.func = tipc_l2_rcv_msg;
428 dev_add_pack(&b->pt);
429 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
430 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
431 b->bcast_addr.media_id = b->media->type_id;
432 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
433 b->mtu = dev->mtu;
434 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
435 rcu_assign_pointer(dev->tipc_ptr, b);
436 return 0;
437}
438
439/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
440 *
441 * Mark L2 bearer as inactive so that incoming buffers are thrown away
442 */
443void tipc_disable_l2_media(struct tipc_bearer *b)
444{
445 struct net_device *dev;
446
447 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
448 dev_remove_pack(&b->pt);
449 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
450 synchronize_net();
451 dev_put(dev);
452}
453
454/**
455 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
456 * @skb: the packet to be sent
457 * @b: the bearer through which the packet is to be sent
458 * @dest: peer destination address
459 */
460int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
461 struct tipc_bearer *b, struct tipc_media_addr *dest)
462{
463 struct net_device *dev;
464 int delta;
465
466 dev = (struct net_device *)rcu_dereference(b->media_ptr);
467 if (!dev)
468 return 0;
469
470 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
471 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
472 kfree_skb(skb);
473 return 0;
474 }
475 skb_reset_network_header(skb);
476 skb->dev = dev;
477 skb->protocol = htons(ETH_P_TIPC);
478 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
479 dev->dev_addr, skb->len);
480 dev_queue_xmit(skb);
481 return 0;
482}
483
484bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
485{
486 bool supp = false;
487 struct tipc_bearer *b;
488
489 rcu_read_lock();
490 b = bearer_get(net, bearer_id);
491 if (b)
492 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
493 rcu_read_unlock();
494 return supp;
495}
496
497int tipc_bearer_mtu(struct net *net, u32 bearer_id)
498{
499 int mtu = 0;
500 struct tipc_bearer *b;
501
502 rcu_read_lock();
503 b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
504 if (b)
505 mtu = b->mtu;
506 rcu_read_unlock();
507 return mtu;
508}
509
510/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
511 */
512void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
513 struct sk_buff *skb,
514 struct tipc_media_addr *dest)
515{
516 struct tipc_msg *hdr = buf_msg(skb);
517 struct tipc_bearer *b;
518
519 rcu_read_lock();
520 b = bearer_get(net, bearer_id);
521 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
522#ifdef CONFIG_TIPC_CRYPTO
523 tipc_crypto_xmit(net, &skb, b, dest, NULL);
524 if (skb)
525#endif
526 b->media->send_msg(net, skb, b, dest);
527 } else {
528 kfree_skb(skb);
529 }
530 rcu_read_unlock();
531}
532
533/* tipc_bearer_xmit() -send buffer to destination over bearer
534 */
535void tipc_bearer_xmit(struct net *net, u32 bearer_id,
536 struct sk_buff_head *xmitq,
537 struct tipc_media_addr *dst,
538 struct tipc_node *__dnode)
539{
540 struct tipc_bearer *b;
541 struct sk_buff *skb, *tmp;
542
543 if (skb_queue_empty(xmitq))
544 return;
545
546 rcu_read_lock();
547 b = bearer_get(net, bearer_id);
548 if (unlikely(!b))
549 __skb_queue_purge(xmitq);
550 skb_queue_walk_safe(xmitq, skb, tmp) {
551 __skb_dequeue(xmitq);
552 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
553#ifdef CONFIG_TIPC_CRYPTO
554 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
555 if (skb)
556#endif
557 b->media->send_msg(net, skb, b, dst);
558 } else {
559 kfree_skb(skb);
560 }
561 }
562 rcu_read_unlock();
563}
564
565/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
566 */
567void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
568 struct sk_buff_head *xmitq)
569{
570 struct tipc_net *tn = tipc_net(net);
571 struct tipc_media_addr *dst;
572 int net_id = tn->net_id;
573 struct tipc_bearer *b;
574 struct sk_buff *skb, *tmp;
575 struct tipc_msg *hdr;
576
577 rcu_read_lock();
578 b = bearer_get(net, bearer_id);
579 if (unlikely(!b || !test_bit(0, &b->up)))
580 __skb_queue_purge(xmitq);
581 skb_queue_walk_safe(xmitq, skb, tmp) {
582 hdr = buf_msg(skb);
583 msg_set_non_seq(hdr, 1);
584 msg_set_mc_netid(hdr, net_id);
585 __skb_dequeue(xmitq);
586 dst = &b->bcast_addr;
587#ifdef CONFIG_TIPC_CRYPTO
588 tipc_crypto_xmit(net, &skb, b, dst, NULL);
589 if (skb)
590#endif
591 b->media->send_msg(net, skb, b, dst);
592 }
593 rcu_read_unlock();
594}
595
596/**
597 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
598 * @skb: the received message
599 * @dev: the net device that the packet was received on
600 * @pt: the packet_type structure which was used to register this handler
601 * @orig_dev: the original receive net device in case the device is a bond
602 *
603 * Accept only packets explicitly sent to this node, or broadcast packets;
604 * ignores packets sent using interface multicast, and traffic sent to other
605 * nodes (which can happen if interface is running in promiscuous mode).
606 */
607static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
608 struct packet_type *pt, struct net_device *orig_dev)
609{
610 struct tipc_bearer *b;
611
612 rcu_read_lock();
613 b = rcu_dereference(dev->tipc_ptr) ?:
614 rcu_dereference(orig_dev->tipc_ptr);
615 if (likely(b && test_bit(0, &b->up) &&
616 (skb->pkt_type <= PACKET_MULTICAST))) {
617 skb_mark_not_on_list(skb);
618 TIPC_SKB_CB(skb)->flags = 0;
619 tipc_rcv(dev_net(b->pt.dev), skb, b);
620 rcu_read_unlock();
621 return NET_RX_SUCCESS;
622 }
623 rcu_read_unlock();
624 kfree_skb(skb);
625 return NET_RX_DROP;
626}
627
628/**
629 * tipc_l2_device_event - handle device events from network device
630 * @nb: the context of the notification
631 * @evt: the type of event
632 * @ptr: the net device that the event was on
633 *
634 * This function is called by the Ethernet driver in case of link
635 * change event.
636 */
637static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
638 void *ptr)
639{
640 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
641 struct net *net = dev_net(dev);
642 struct tipc_bearer *b;
643
644 b = rtnl_dereference(dev->tipc_ptr);
645 if (!b)
646 return NOTIFY_DONE;
647
648 trace_tipc_l2_device_event(dev, b, evt);
649 switch (evt) {
650 case NETDEV_CHANGE:
651 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
652 test_and_set_bit_lock(0, &b->up);
653 break;
654 }
655 fallthrough;
656 case NETDEV_GOING_DOWN:
657 clear_bit_unlock(0, &b->up);
658 tipc_reset_bearer(net, b);
659 break;
660 case NETDEV_UP:
661 test_and_set_bit_lock(0, &b->up);
662 break;
663 case NETDEV_CHANGEMTU:
664 if (tipc_mtu_bad(dev, 0)) {
665 bearer_disable(net, b);
666 break;
667 }
668 b->mtu = dev->mtu;
669 tipc_reset_bearer(net, b);
670 break;
671 case NETDEV_CHANGEADDR:
672 b->media->raw2addr(b, &b->addr,
673 (char *)dev->dev_addr);
674 tipc_reset_bearer(net, b);
675 break;
676 case NETDEV_UNREGISTER:
677 case NETDEV_CHANGENAME:
678 bearer_disable(net, b);
679 break;
680 }
681 return NOTIFY_OK;
682}
683
684static struct notifier_block notifier = {
685 .notifier_call = tipc_l2_device_event,
686 .priority = 0,
687};
688
689int tipc_bearer_setup(void)
690{
691 return register_netdevice_notifier(¬ifier);
692}
693
694void tipc_bearer_cleanup(void)
695{
696 unregister_netdevice_notifier(¬ifier);
697}
698
699void tipc_bearer_stop(struct net *net)
700{
701 struct tipc_net *tn = net_generic(net, tipc_net_id);
702 struct tipc_bearer *b;
703 u32 i;
704
705 for (i = 0; i < MAX_BEARERS; i++) {
706 b = rtnl_dereference(tn->bearer_list[i]);
707 if (b) {
708 bearer_disable(net, b);
709 tn->bearer_list[i] = NULL;
710 }
711 }
712}
713
714void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
715{
716 struct net_device *dev = net->loopback_dev;
717 struct sk_buff *skb, *_skb;
718 int exp;
719
720 skb_queue_walk(pkts, _skb) {
721 skb = pskb_copy(_skb, GFP_ATOMIC);
722 if (!skb)
723 continue;
724
725 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
726 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
727 kfree_skb(skb);
728 continue;
729 }
730
731 skb_reset_network_header(skb);
732 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
733 dev->dev_addr, skb->len);
734 skb->dev = dev;
735 skb->pkt_type = PACKET_HOST;
736 skb->ip_summed = CHECKSUM_UNNECESSARY;
737 skb->protocol = eth_type_trans(skb, dev);
738 netif_rx_ni(skb);
739 }
740}
741
742static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
743 struct packet_type *pt, struct net_device *od)
744{
745 consume_skb(skb);
746 return NET_RX_SUCCESS;
747}
748
749int tipc_attach_loopback(struct net *net)
750{
751 struct net_device *dev = net->loopback_dev;
752 struct tipc_net *tn = tipc_net(net);
753
754 if (!dev)
755 return -ENODEV;
756
757 dev_hold(dev);
758 tn->loopback_pt.dev = dev;
759 tn->loopback_pt.type = htons(ETH_P_TIPC);
760 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
761 dev_add_pack(&tn->loopback_pt);
762 return 0;
763}
764
765void tipc_detach_loopback(struct net *net)
766{
767 struct tipc_net *tn = tipc_net(net);
768
769 dev_remove_pack(&tn->loopback_pt);
770 dev_put(net->loopback_dev);
771}
772
773/* Caller should hold rtnl_lock to protect the bearer */
774static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
775 struct tipc_bearer *bearer, int nlflags)
776{
777 void *hdr;
778 struct nlattr *attrs;
779 struct nlattr *prop;
780
781 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
782 nlflags, TIPC_NL_BEARER_GET);
783 if (!hdr)
784 return -EMSGSIZE;
785
786 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
787 if (!attrs)
788 goto msg_full;
789
790 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
791 goto attr_msg_full;
792
793 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
794 if (!prop)
795 goto prop_msg_full;
796 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
797 goto prop_msg_full;
798 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
799 goto prop_msg_full;
800 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
801 goto prop_msg_full;
802 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
803 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
804 goto prop_msg_full;
805
806 nla_nest_end(msg->skb, prop);
807
808#ifdef CONFIG_TIPC_MEDIA_UDP
809 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
810 if (tipc_udp_nl_add_bearer_data(msg, bearer))
811 goto attr_msg_full;
812 }
813#endif
814
815 nla_nest_end(msg->skb, attrs);
816 genlmsg_end(msg->skb, hdr);
817
818 return 0;
819
820prop_msg_full:
821 nla_nest_cancel(msg->skb, prop);
822attr_msg_full:
823 nla_nest_cancel(msg->skb, attrs);
824msg_full:
825 genlmsg_cancel(msg->skb, hdr);
826
827 return -EMSGSIZE;
828}
829
830int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
831{
832 int err;
833 int i = cb->args[0];
834 struct tipc_bearer *bearer;
835 struct tipc_nl_msg msg;
836 struct net *net = sock_net(skb->sk);
837 struct tipc_net *tn = net_generic(net, tipc_net_id);
838
839 if (i == MAX_BEARERS)
840 return 0;
841
842 msg.skb = skb;
843 msg.portid = NETLINK_CB(cb->skb).portid;
844 msg.seq = cb->nlh->nlmsg_seq;
845
846 rtnl_lock();
847 for (i = 0; i < MAX_BEARERS; i++) {
848 bearer = rtnl_dereference(tn->bearer_list[i]);
849 if (!bearer)
850 continue;
851
852 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
853 if (err)
854 break;
855 }
856 rtnl_unlock();
857
858 cb->args[0] = i;
859 return skb->len;
860}
861
862int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
863{
864 int err;
865 char *name;
866 struct sk_buff *rep;
867 struct tipc_bearer *bearer;
868 struct tipc_nl_msg msg;
869 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
870 struct net *net = genl_info_net(info);
871
872 if (!info->attrs[TIPC_NLA_BEARER])
873 return -EINVAL;
874
875 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
876 info->attrs[TIPC_NLA_BEARER],
877 tipc_nl_bearer_policy, info->extack);
878 if (err)
879 return err;
880
881 if (!attrs[TIPC_NLA_BEARER_NAME])
882 return -EINVAL;
883 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
884
885 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
886 if (!rep)
887 return -ENOMEM;
888
889 msg.skb = rep;
890 msg.portid = info->snd_portid;
891 msg.seq = info->snd_seq;
892
893 rtnl_lock();
894 bearer = tipc_bearer_find(net, name);
895 if (!bearer) {
896 err = -EINVAL;
897 goto err_out;
898 }
899
900 err = __tipc_nl_add_bearer(&msg, bearer, 0);
901 if (err)
902 goto err_out;
903 rtnl_unlock();
904
905 return genlmsg_reply(rep, info);
906err_out:
907 rtnl_unlock();
908 nlmsg_free(rep);
909
910 return err;
911}
912
913int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
914{
915 int err;
916 char *name;
917 struct tipc_bearer *bearer;
918 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
919 struct net *net = sock_net(skb->sk);
920
921 if (!info->attrs[TIPC_NLA_BEARER])
922 return -EINVAL;
923
924 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
925 info->attrs[TIPC_NLA_BEARER],
926 tipc_nl_bearer_policy, info->extack);
927 if (err)
928 return err;
929
930 if (!attrs[TIPC_NLA_BEARER_NAME])
931 return -EINVAL;
932
933 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
934
935 bearer = tipc_bearer_find(net, name);
936 if (!bearer)
937 return -EINVAL;
938
939 bearer_disable(net, bearer);
940
941 return 0;
942}
943
944int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
945{
946 int err;
947
948 rtnl_lock();
949 err = __tipc_nl_bearer_disable(skb, info);
950 rtnl_unlock();
951
952 return err;
953}
954
955int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
956{
957 int err;
958 char *bearer;
959 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
960 struct net *net = sock_net(skb->sk);
961 u32 domain = 0;
962 u32 prio;
963
964 prio = TIPC_MEDIA_LINK_PRI;
965
966 if (!info->attrs[TIPC_NLA_BEARER])
967 return -EINVAL;
968
969 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
970 info->attrs[TIPC_NLA_BEARER],
971 tipc_nl_bearer_policy, info->extack);
972 if (err)
973 return err;
974
975 if (!attrs[TIPC_NLA_BEARER_NAME])
976 return -EINVAL;
977
978 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
979
980 if (attrs[TIPC_NLA_BEARER_DOMAIN])
981 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
982
983 if (attrs[TIPC_NLA_BEARER_PROP]) {
984 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
985
986 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
987 props);
988 if (err)
989 return err;
990
991 if (props[TIPC_NLA_PROP_PRIO])
992 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
993 }
994
995 return tipc_enable_bearer(net, bearer, domain, prio, attrs);
996}
997
998int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
999{
1000 int err;
1001
1002 rtnl_lock();
1003 err = __tipc_nl_bearer_enable(skb, info);
1004 rtnl_unlock();
1005
1006 return err;
1007}
1008
1009int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1010{
1011 int err;
1012 char *name;
1013 struct tipc_bearer *b;
1014 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1015 struct net *net = sock_net(skb->sk);
1016
1017 if (!info->attrs[TIPC_NLA_BEARER])
1018 return -EINVAL;
1019
1020 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1021 info->attrs[TIPC_NLA_BEARER],
1022 tipc_nl_bearer_policy, info->extack);
1023 if (err)
1024 return err;
1025
1026 if (!attrs[TIPC_NLA_BEARER_NAME])
1027 return -EINVAL;
1028 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1029
1030 rtnl_lock();
1031 b = tipc_bearer_find(net, name);
1032 if (!b) {
1033 rtnl_unlock();
1034 return -EINVAL;
1035 }
1036
1037#ifdef CONFIG_TIPC_MEDIA_UDP
1038 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1039 err = tipc_udp_nl_bearer_add(b,
1040 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1041 if (err) {
1042 rtnl_unlock();
1043 return err;
1044 }
1045 }
1046#endif
1047 rtnl_unlock();
1048
1049 return 0;
1050}
1051
1052int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1053{
1054 struct tipc_bearer *b;
1055 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1056 struct net *net = sock_net(skb->sk);
1057 char *name;
1058 int err;
1059
1060 if (!info->attrs[TIPC_NLA_BEARER])
1061 return -EINVAL;
1062
1063 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1064 info->attrs[TIPC_NLA_BEARER],
1065 tipc_nl_bearer_policy, info->extack);
1066 if (err)
1067 return err;
1068
1069 if (!attrs[TIPC_NLA_BEARER_NAME])
1070 return -EINVAL;
1071 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1072
1073 b = tipc_bearer_find(net, name);
1074 if (!b)
1075 return -EINVAL;
1076
1077 if (attrs[TIPC_NLA_BEARER_PROP]) {
1078 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1079
1080 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1081 props);
1082 if (err)
1083 return err;
1084
1085 if (props[TIPC_NLA_PROP_TOL]) {
1086 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1087 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1088 }
1089 if (props[TIPC_NLA_PROP_PRIO])
1090 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1091 if (props[TIPC_NLA_PROP_WIN])
1092 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1093 if (props[TIPC_NLA_PROP_MTU]) {
1094 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1095 return -EINVAL;
1096#ifdef CONFIG_TIPC_MEDIA_UDP
1097 if (tipc_udp_mtu_bad(nla_get_u32
1098 (props[TIPC_NLA_PROP_MTU])))
1099 return -EINVAL;
1100 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1101 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1102#endif
1103 }
1104 }
1105
1106 return 0;
1107}
1108
1109int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1110{
1111 int err;
1112
1113 rtnl_lock();
1114 err = __tipc_nl_bearer_set(skb, info);
1115 rtnl_unlock();
1116
1117 return err;
1118}
1119
1120static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1121 struct tipc_media *media, int nlflags)
1122{
1123 void *hdr;
1124 struct nlattr *attrs;
1125 struct nlattr *prop;
1126
1127 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1128 nlflags, TIPC_NL_MEDIA_GET);
1129 if (!hdr)
1130 return -EMSGSIZE;
1131
1132 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1133 if (!attrs)
1134 goto msg_full;
1135
1136 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1137 goto attr_msg_full;
1138
1139 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1140 if (!prop)
1141 goto prop_msg_full;
1142 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1143 goto prop_msg_full;
1144 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1145 goto prop_msg_full;
1146 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1147 goto prop_msg_full;
1148 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1149 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1150 goto prop_msg_full;
1151
1152 nla_nest_end(msg->skb, prop);
1153 nla_nest_end(msg->skb, attrs);
1154 genlmsg_end(msg->skb, hdr);
1155
1156 return 0;
1157
1158prop_msg_full:
1159 nla_nest_cancel(msg->skb, prop);
1160attr_msg_full:
1161 nla_nest_cancel(msg->skb, attrs);
1162msg_full:
1163 genlmsg_cancel(msg->skb, hdr);
1164
1165 return -EMSGSIZE;
1166}
1167
1168int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1169{
1170 int err;
1171 int i = cb->args[0];
1172 struct tipc_nl_msg msg;
1173
1174 if (i == MAX_MEDIA)
1175 return 0;
1176
1177 msg.skb = skb;
1178 msg.portid = NETLINK_CB(cb->skb).portid;
1179 msg.seq = cb->nlh->nlmsg_seq;
1180
1181 rtnl_lock();
1182 for (; media_info_array[i] != NULL; i++) {
1183 err = __tipc_nl_add_media(&msg, media_info_array[i],
1184 NLM_F_MULTI);
1185 if (err)
1186 break;
1187 }
1188 rtnl_unlock();
1189
1190 cb->args[0] = i;
1191 return skb->len;
1192}
1193
1194int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1195{
1196 int err;
1197 char *name;
1198 struct tipc_nl_msg msg;
1199 struct tipc_media *media;
1200 struct sk_buff *rep;
1201 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1202
1203 if (!info->attrs[TIPC_NLA_MEDIA])
1204 return -EINVAL;
1205
1206 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1207 info->attrs[TIPC_NLA_MEDIA],
1208 tipc_nl_media_policy, info->extack);
1209 if (err)
1210 return err;
1211
1212 if (!attrs[TIPC_NLA_MEDIA_NAME])
1213 return -EINVAL;
1214 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1215
1216 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1217 if (!rep)
1218 return -ENOMEM;
1219
1220 msg.skb = rep;
1221 msg.portid = info->snd_portid;
1222 msg.seq = info->snd_seq;
1223
1224 rtnl_lock();
1225 media = tipc_media_find(name);
1226 if (!media) {
1227 err = -EINVAL;
1228 goto err_out;
1229 }
1230
1231 err = __tipc_nl_add_media(&msg, media, 0);
1232 if (err)
1233 goto err_out;
1234 rtnl_unlock();
1235
1236 return genlmsg_reply(rep, info);
1237err_out:
1238 rtnl_unlock();
1239 nlmsg_free(rep);
1240
1241 return err;
1242}
1243
1244int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1245{
1246 int err;
1247 char *name;
1248 struct tipc_media *m;
1249 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1250
1251 if (!info->attrs[TIPC_NLA_MEDIA])
1252 return -EINVAL;
1253
1254 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1255 info->attrs[TIPC_NLA_MEDIA],
1256 tipc_nl_media_policy, info->extack);
1257
1258 if (!attrs[TIPC_NLA_MEDIA_NAME])
1259 return -EINVAL;
1260 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1261
1262 m = tipc_media_find(name);
1263 if (!m)
1264 return -EINVAL;
1265
1266 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1267 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1268
1269 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1270 props);
1271 if (err)
1272 return err;
1273
1274 if (props[TIPC_NLA_PROP_TOL])
1275 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1276 if (props[TIPC_NLA_PROP_PRIO])
1277 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1278 if (props[TIPC_NLA_PROP_WIN])
1279 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1280 if (props[TIPC_NLA_PROP_MTU]) {
1281 if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1282 return -EINVAL;
1283#ifdef CONFIG_TIPC_MEDIA_UDP
1284 if (tipc_udp_mtu_bad(nla_get_u32
1285 (props[TIPC_NLA_PROP_MTU])))
1286 return -EINVAL;
1287 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1288#endif
1289 }
1290 }
1291
1292 return 0;
1293}
1294
1295int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1296{
1297 int err;
1298
1299 rtnl_lock();
1300 err = __tipc_nl_media_set(skb, info);
1301 rtnl_unlock();
1302
1303 return err;
1304}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2011, 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 "core.h"
38#include "config.h"
39#include "bearer.h"
40#include "discover.h"
41
42#define MAX_ADDR_STR 32
43
44static struct tipc_media *media_list[MAX_MEDIA];
45static u32 media_count;
46
47struct tipc_bearer tipc_bearers[MAX_BEARERS];
48
49static void bearer_disable(struct tipc_bearer *b_ptr);
50
51/**
52 * media_name_valid - validate media name
53 *
54 * Returns 1 if media name is valid, otherwise 0.
55 */
56static int media_name_valid(const char *name)
57{
58 u32 len;
59
60 len = strlen(name);
61 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
62 return 0;
63 return strspn(name, tipc_alphabet) == len;
64}
65
66/**
67 * tipc_media_find - locates specified media object by name
68 */
69struct tipc_media *tipc_media_find(const char *name)
70{
71 u32 i;
72
73 for (i = 0; i < media_count; i++) {
74 if (!strcmp(media_list[i]->name, name))
75 return media_list[i];
76 }
77 return NULL;
78}
79
80/**
81 * media_find_id - locates specified media object by type identifier
82 */
83static struct tipc_media *media_find_id(u8 type)
84{
85 u32 i;
86
87 for (i = 0; i < media_count; i++) {
88 if (media_list[i]->type_id == type)
89 return media_list[i];
90 }
91 return NULL;
92}
93
94/**
95 * tipc_register_media - register a media type
96 *
97 * Bearers for this media type must be activated separately at a later stage.
98 */
99int tipc_register_media(struct tipc_media *m_ptr)
100{
101 int res = -EINVAL;
102
103 write_lock_bh(&tipc_net_lock);
104
105 if (!media_name_valid(m_ptr->name))
106 goto exit;
107 if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) ||
108 !m_ptr->bcast_addr.broadcast)
109 goto exit;
110 if (m_ptr->priority > TIPC_MAX_LINK_PRI)
111 goto exit;
112 if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) ||
113 (m_ptr->tolerance > TIPC_MAX_LINK_TOL))
114 goto exit;
115 if (media_count >= MAX_MEDIA)
116 goto exit;
117 if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id))
118 goto exit;
119
120 media_list[media_count] = m_ptr;
121 media_count++;
122 res = 0;
123exit:
124 write_unlock_bh(&tipc_net_lock);
125 if (res)
126 warn("Media <%s> registration error\n", m_ptr->name);
127 return res;
128}
129
130/**
131 * tipc_media_addr_printf - record media address in print buffer
132 */
133void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
134{
135 char addr_str[MAX_ADDR_STR];
136 struct tipc_media *m_ptr;
137
138 m_ptr = media_find_id(a->media_id);
139
140 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
141 tipc_printf(pb, "%s(%s)", m_ptr->name, addr_str);
142 else {
143 u32 i;
144
145 tipc_printf(pb, "UNKNOWN(%u)", a->media_id);
146 for (i = 0; i < sizeof(a->value); i++)
147 tipc_printf(pb, "-%02x", a->value[i]);
148 }
149}
150
151/**
152 * tipc_media_get_names - record names of registered media in buffer
153 */
154struct sk_buff *tipc_media_get_names(void)
155{
156 struct sk_buff *buf;
157 int i;
158
159 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
160 if (!buf)
161 return NULL;
162
163 read_lock_bh(&tipc_net_lock);
164 for (i = 0; i < media_count; i++) {
165 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
166 media_list[i]->name,
167 strlen(media_list[i]->name) + 1);
168 }
169 read_unlock_bh(&tipc_net_lock);
170 return buf;
171}
172
173/**
174 * bearer_name_validate - validate & (optionally) deconstruct bearer name
175 * @name - ptr to bearer name string
176 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
177 *
178 * Returns 1 if bearer name is valid, otherwise 0.
179 */
180static int bearer_name_validate(const char *name,
181 struct tipc_bearer_names *name_parts)
182{
183 char name_copy[TIPC_MAX_BEARER_NAME];
184 char *media_name;
185 char *if_name;
186 u32 media_len;
187 u32 if_len;
188
189 /* copy bearer name & ensure length is OK */
190 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
191 /* need above in case non-Posix strncpy() doesn't pad with nulls */
192 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
193 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
194 return 0;
195
196 /* ensure all component parts of bearer name are present */
197 media_name = name_copy;
198 if_name = strchr(media_name, ':');
199 if (if_name == NULL)
200 return 0;
201 *(if_name++) = 0;
202 media_len = if_name - media_name;
203 if_len = strlen(if_name) + 1;
204
205 /* validate component parts of bearer name */
206 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
207 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
208 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
209 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
210 return 0;
211
212 /* return bearer name components, if necessary */
213 if (name_parts) {
214 strcpy(name_parts->media_name, media_name);
215 strcpy(name_parts->if_name, if_name);
216 }
217 return 1;
218}
219
220/**
221 * tipc_bearer_find - locates bearer object with matching bearer name
222 */
223struct tipc_bearer *tipc_bearer_find(const char *name)
224{
225 struct tipc_bearer *b_ptr;
226 u32 i;
227
228 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
229 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
230 return b_ptr;
231 }
232 return NULL;
233}
234
235/**
236 * tipc_bearer_find_interface - locates bearer object with matching interface name
237 */
238struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
239{
240 struct tipc_bearer *b_ptr;
241 char *b_if_name;
242 u32 i;
243
244 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
245 if (!b_ptr->active)
246 continue;
247 b_if_name = strchr(b_ptr->name, ':') + 1;
248 if (!strcmp(b_if_name, if_name))
249 return b_ptr;
250 }
251 return NULL;
252}
253
254/**
255 * tipc_bearer_get_names - record names of bearers in buffer
256 */
257struct sk_buff *tipc_bearer_get_names(void)
258{
259 struct sk_buff *buf;
260 struct tipc_bearer *b_ptr;
261 int i, j;
262
263 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
264 if (!buf)
265 return NULL;
266
267 read_lock_bh(&tipc_net_lock);
268 for (i = 0; i < media_count; i++) {
269 for (j = 0; j < MAX_BEARERS; j++) {
270 b_ptr = &tipc_bearers[j];
271 if (b_ptr->active && (b_ptr->media == media_list[i])) {
272 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
273 b_ptr->name,
274 strlen(b_ptr->name) + 1);
275 }
276 }
277 }
278 read_unlock_bh(&tipc_net_lock);
279 return buf;
280}
281
282void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
283{
284 tipc_nmap_add(&b_ptr->nodes, dest);
285 tipc_bcbearer_sort();
286 tipc_disc_add_dest(b_ptr->link_req);
287}
288
289void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
290{
291 tipc_nmap_remove(&b_ptr->nodes, dest);
292 tipc_bcbearer_sort();
293 tipc_disc_remove_dest(b_ptr->link_req);
294}
295
296/*
297 * bearer_push(): Resolve bearer congestion. Force the waiting
298 * links to push out their unsent packets, one packet per link
299 * per iteration, until all packets are gone or congestion reoccurs.
300 * 'tipc_net_lock' is read_locked when this function is called
301 * bearer.lock must be taken before calling
302 * Returns binary true(1) ore false(0)
303 */
304static int bearer_push(struct tipc_bearer *b_ptr)
305{
306 u32 res = 0;
307 struct tipc_link *ln, *tln;
308
309 if (b_ptr->blocked)
310 return 0;
311
312 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
313 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
314 res = tipc_link_push_packet(ln);
315 if (res == PUSH_FAILED)
316 break;
317 if (res == PUSH_FINISHED)
318 list_move_tail(&ln->link_list, &b_ptr->links);
319 }
320 }
321 return list_empty(&b_ptr->cong_links);
322}
323
324void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
325{
326 spin_lock_bh(&b_ptr->lock);
327 bearer_push(b_ptr);
328 spin_unlock_bh(&b_ptr->lock);
329}
330
331
332/*
333 * Interrupt enabling new requests after bearer congestion or blocking:
334 * See bearer_send().
335 */
336void tipc_continue(struct tipc_bearer *b_ptr)
337{
338 spin_lock_bh(&b_ptr->lock);
339 if (!list_empty(&b_ptr->cong_links))
340 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
341 b_ptr->blocked = 0;
342 spin_unlock_bh(&b_ptr->lock);
343}
344
345/*
346 * Schedule link for sending of messages after the bearer
347 * has been deblocked by 'continue()'. This method is called
348 * when somebody tries to send a message via this link while
349 * the bearer is congested. 'tipc_net_lock' is in read_lock here
350 * bearer.lock is busy
351 */
352static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr,
353 struct tipc_link *l_ptr)
354{
355 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
356}
357
358/*
359 * Schedule link for sending of messages after the bearer
360 * has been deblocked by 'continue()'. This method is called
361 * when somebody tries to send a message via this link while
362 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
363 * bearer.lock is free
364 */
365void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
366{
367 spin_lock_bh(&b_ptr->lock);
368 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
369 spin_unlock_bh(&b_ptr->lock);
370}
371
372
373/*
374 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
375 * and if there is, try to resolve it before returning.
376 * 'tipc_net_lock' is read_locked when this function is called
377 */
378int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
379 struct tipc_link *l_ptr)
380{
381 int res = 1;
382
383 if (list_empty(&b_ptr->cong_links))
384 return 1;
385 spin_lock_bh(&b_ptr->lock);
386 if (!bearer_push(b_ptr)) {
387 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
388 res = 0;
389 }
390 spin_unlock_bh(&b_ptr->lock);
391 return res;
392}
393
394/**
395 * tipc_bearer_congested - determines if bearer is currently congested
396 */
397int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
398{
399 if (unlikely(b_ptr->blocked))
400 return 1;
401 if (likely(list_empty(&b_ptr->cong_links)))
402 return 0;
403 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
404}
405
406/**
407 * tipc_enable_bearer - enable bearer with the given name
408 */
409int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
410{
411 struct tipc_bearer *b_ptr;
412 struct tipc_media *m_ptr;
413 struct tipc_bearer_names b_names;
414 char addr_string[16];
415 u32 bearer_id;
416 u32 with_this_prio;
417 u32 i;
418 int res = -EINVAL;
419
420 if (!tipc_own_addr) {
421 warn("Bearer <%s> rejected, not supported in standalone mode\n",
422 name);
423 return -ENOPROTOOPT;
424 }
425 if (!bearer_name_validate(name, &b_names)) {
426 warn("Bearer <%s> rejected, illegal name\n", name);
427 return -EINVAL;
428 }
429 if (tipc_addr_domain_valid(disc_domain) &&
430 (disc_domain != tipc_own_addr)) {
431 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
432 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
433 res = 0; /* accept any node in own cluster */
434 } else if (in_own_cluster_exact(disc_domain))
435 res = 0; /* accept specified node in own cluster */
436 }
437 if (res) {
438 warn("Bearer <%s> rejected, illegal discovery domain\n", name);
439 return -EINVAL;
440 }
441 if ((priority > TIPC_MAX_LINK_PRI) &&
442 (priority != TIPC_MEDIA_LINK_PRI)) {
443 warn("Bearer <%s> rejected, illegal priority\n", name);
444 return -EINVAL;
445 }
446
447 write_lock_bh(&tipc_net_lock);
448
449 m_ptr = tipc_media_find(b_names.media_name);
450 if (!m_ptr) {
451 warn("Bearer <%s> rejected, media <%s> not registered\n", name,
452 b_names.media_name);
453 goto exit;
454 }
455
456 if (priority == TIPC_MEDIA_LINK_PRI)
457 priority = m_ptr->priority;
458
459restart:
460 bearer_id = MAX_BEARERS;
461 with_this_prio = 1;
462 for (i = MAX_BEARERS; i-- != 0; ) {
463 if (!tipc_bearers[i].active) {
464 bearer_id = i;
465 continue;
466 }
467 if (!strcmp(name, tipc_bearers[i].name)) {
468 warn("Bearer <%s> rejected, already enabled\n", name);
469 goto exit;
470 }
471 if ((tipc_bearers[i].priority == priority) &&
472 (++with_this_prio > 2)) {
473 if (priority-- == 0) {
474 warn("Bearer <%s> rejected, duplicate priority\n",
475 name);
476 goto exit;
477 }
478 warn("Bearer <%s> priority adjustment required %u->%u\n",
479 name, priority + 1, priority);
480 goto restart;
481 }
482 }
483 if (bearer_id >= MAX_BEARERS) {
484 warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
485 name, MAX_BEARERS);
486 goto exit;
487 }
488
489 b_ptr = &tipc_bearers[bearer_id];
490 strcpy(b_ptr->name, name);
491 res = m_ptr->enable_bearer(b_ptr);
492 if (res) {
493 warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
494 goto exit;
495 }
496
497 b_ptr->identity = bearer_id;
498 b_ptr->media = m_ptr;
499 b_ptr->tolerance = m_ptr->tolerance;
500 b_ptr->window = m_ptr->window;
501 b_ptr->net_plane = bearer_id + 'A';
502 b_ptr->active = 1;
503 b_ptr->priority = priority;
504 INIT_LIST_HEAD(&b_ptr->cong_links);
505 INIT_LIST_HEAD(&b_ptr->links);
506 spin_lock_init(&b_ptr->lock);
507
508 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
509 if (res) {
510 bearer_disable(b_ptr);
511 warn("Bearer <%s> rejected, discovery object creation failed\n",
512 name);
513 goto exit;
514 }
515 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
516 name, tipc_addr_string_fill(addr_string, disc_domain), priority);
517exit:
518 write_unlock_bh(&tipc_net_lock);
519 return res;
520}
521
522/**
523 * tipc_block_bearer(): Block the bearer with the given name,
524 * and reset all its links
525 */
526int tipc_block_bearer(const char *name)
527{
528 struct tipc_bearer *b_ptr = NULL;
529 struct tipc_link *l_ptr;
530 struct tipc_link *temp_l_ptr;
531
532 read_lock_bh(&tipc_net_lock);
533 b_ptr = tipc_bearer_find(name);
534 if (!b_ptr) {
535 warn("Attempt to block unknown bearer <%s>\n", name);
536 read_unlock_bh(&tipc_net_lock);
537 return -EINVAL;
538 }
539
540 info("Blocking bearer <%s>\n", name);
541 spin_lock_bh(&b_ptr->lock);
542 b_ptr->blocked = 1;
543 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
544 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
545 struct tipc_node *n_ptr = l_ptr->owner;
546
547 spin_lock_bh(&n_ptr->lock);
548 tipc_link_reset(l_ptr);
549 spin_unlock_bh(&n_ptr->lock);
550 }
551 spin_unlock_bh(&b_ptr->lock);
552 read_unlock_bh(&tipc_net_lock);
553 return 0;
554}
555
556/**
557 * bearer_disable
558 *
559 * Note: This routine assumes caller holds tipc_net_lock.
560 */
561static void bearer_disable(struct tipc_bearer *b_ptr)
562{
563 struct tipc_link *l_ptr;
564 struct tipc_link *temp_l_ptr;
565
566 info("Disabling bearer <%s>\n", b_ptr->name);
567 spin_lock_bh(&b_ptr->lock);
568 b_ptr->blocked = 1;
569 b_ptr->media->disable_bearer(b_ptr);
570 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
571 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
572 tipc_link_delete(l_ptr);
573 }
574 if (b_ptr->link_req)
575 tipc_disc_delete(b_ptr->link_req);
576 spin_unlock_bh(&b_ptr->lock);
577 memset(b_ptr, 0, sizeof(struct tipc_bearer));
578}
579
580int tipc_disable_bearer(const char *name)
581{
582 struct tipc_bearer *b_ptr;
583 int res;
584
585 write_lock_bh(&tipc_net_lock);
586 b_ptr = tipc_bearer_find(name);
587 if (b_ptr == NULL) {
588 warn("Attempt to disable unknown bearer <%s>\n", name);
589 res = -EINVAL;
590 } else {
591 bearer_disable(b_ptr);
592 res = 0;
593 }
594 write_unlock_bh(&tipc_net_lock);
595 return res;
596}
597
598
599
600void tipc_bearer_stop(void)
601{
602 u32 i;
603
604 for (i = 0; i < MAX_BEARERS; i++) {
605 if (tipc_bearers[i].active)
606 bearer_disable(&tipc_bearers[i]);
607 }
608 media_count = 0;
609}