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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, 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}