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powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / net / tipc / bearer.c
blob52d74760fb68697d508fafb213b56deaed2e8639
1 /*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include <net/sock.h>
38 #include "core.h"
39 #include "bearer.h"
40 #include "link.h"
41 #include "discover.h"
42 #include "monitor.h"
43 #include "bcast.h"
44 #include "netlink.h"
45 #include "udp_media.h"
46
47 #define MAX_ADDR_STR 60
48
49 static struct tipc_media * const media_info_array[] = {
50 &eth_media_info,
51 #ifdef CONFIG_TIPC_MEDIA_IB
52 &ib_media_info,
53 #endif
54 #ifdef CONFIG_TIPC_MEDIA_UDP
55 &udp_media_info,
56 #endif
57 NULL
58 };
59
60 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
61 {
62 struct tipc_net *tn = tipc_net(net);
63
64 return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
65 }
66
67 static void bearer_disable(struct net *net, struct tipc_bearer *b);
68
69 /**
70 * tipc_media_find - locates specified media object by name
71 */
72 struct tipc_media *tipc_media_find(const char *name)
73 {
74 u32 i;
75
76 for (i = 0; media_info_array[i] != NULL; i++) {
77 if (!strcmp(media_info_array[i]->name, name))
78 break;
79 }
80 return media_info_array[i];
81 }
82
83 /**
84 * media_find_id - locates specified media object by type identifier
85 */
86 static struct tipc_media *media_find_id(u8 type)
87 {
88 u32 i;
89
90 for (i = 0; media_info_array[i] != NULL; i++) {
91 if (media_info_array[i]->type_id == type)
92 break;
93 }
94 return media_info_array[i];
95 }
96
97 /**
98 * tipc_media_addr_printf - record media address in print buffer
99 */
100 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
101 {
102 char addr_str[MAX_ADDR_STR];
103 struct tipc_media *m;
104 int ret;
105
106 m = media_find_id(a->media_id);
107
108 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
109 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
110 else {
111 u32 i;
112
113 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
114 for (i = 0; i < sizeof(a->value); i++)
115 ret += scnprintf(buf - ret, len + ret,
116 "-%02x", a->value[i]);
117 }
118 }
119
120 /**
121 * bearer_name_validate - validate & (optionally) deconstruct bearer name
122 * @name: ptr to bearer name string
123 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
124 *
125 * Returns 1 if bearer name is valid, otherwise 0.
126 */
127 static int bearer_name_validate(const char *name,
128 struct tipc_bearer_names *name_parts)
129 {
130 char name_copy[TIPC_MAX_BEARER_NAME];
131 char *media_name;
132 char *if_name;
133 u32 media_len;
134 u32 if_len;
135
136 /* copy bearer name & ensure length is OK */
137 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
138 /* need above in case non-Posix strncpy() doesn't pad with nulls */
139 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
140 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
141 return 0;
142
143 /* ensure all component parts of bearer name are present */
144 media_name = name_copy;
145 if_name = strchr(media_name, ':');
146 if (if_name == NULL)
147 return 0;
148 *(if_name++) = 0;
149 media_len = if_name - media_name;
150 if_len = strlen(if_name) + 1;
151
152 /* validate component parts of bearer name */
153 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
154 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
155 return 0;
156
157 /* return bearer name components, if necessary */
158 if (name_parts) {
159 strcpy(name_parts->media_name, media_name);
160 strcpy(name_parts->if_name, if_name);
161 }
162 return 1;
163 }
164
165 /**
166 * tipc_bearer_find - locates bearer object with matching bearer name
167 */
168 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
169 {
170 struct tipc_net *tn = net_generic(net, tipc_net_id);
171 struct tipc_bearer *b;
172 u32 i;
173
174 for (i = 0; i < MAX_BEARERS; i++) {
175 b = rtnl_dereference(tn->bearer_list[i]);
176 if (b && (!strcmp(b->name, name)))
177 return b;
178 }
179 return NULL;
180 }
181
182 /* tipc_bearer_get_name - get the bearer name from its id.
183 * @net: network namespace
184 * @name: a pointer to the buffer where the name will be stored.
185 * @bearer_id: the id to get the name from.
186 */
187 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
188 {
189 struct tipc_net *tn = tipc_net(net);
190 struct tipc_bearer *b;
191
192 if (bearer_id >= MAX_BEARERS)
193 return -EINVAL;
194
195 b = rtnl_dereference(tn->bearer_list[bearer_id]);
196 if (!b)
197 return -EINVAL;
198
199 strcpy(name, b->name);
200 return 0;
201 }
202
203 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
204 {
205 struct tipc_net *tn = net_generic(net, tipc_net_id);
206 struct tipc_bearer *b;
207
208 rcu_read_lock();
209 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
210 if (b)
211 tipc_disc_add_dest(b->link_req);
212 rcu_read_unlock();
213 }
214
215 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
216 {
217 struct tipc_net *tn = net_generic(net, tipc_net_id);
218 struct tipc_bearer *b;
219
220 rcu_read_lock();
221 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
222 if (b)
223 tipc_disc_remove_dest(b->link_req);
224 rcu_read_unlock();
225 }
226
227 /**
228 * tipc_enable_bearer - enable bearer with the given name
229 */
230 static int tipc_enable_bearer(struct net *net, const char *name,
231 u32 disc_domain, u32 priority,
232 struct nlattr *attr[])
233 {
234 struct tipc_net *tn = net_generic(net, tipc_net_id);
235 struct tipc_bearer *b;
236 struct tipc_media *m;
237 struct tipc_bearer_names b_names;
238 struct sk_buff *skb;
239 char addr_string[16];
240 u32 bearer_id;
241 u32 with_this_prio;
242 u32 i;
243 int res = -EINVAL;
244
245 if (!tn->own_addr) {
246 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
247 name);
248 return -ENOPROTOOPT;
249 }
250 if (!bearer_name_validate(name, &b_names)) {
251 pr_warn("Bearer <%s> rejected, illegal name\n", name);
252 return -EINVAL;
253 }
254 if (tipc_addr_domain_valid(disc_domain) &&
255 (disc_domain != tn->own_addr)) {
256 if (tipc_in_scope(disc_domain, tn->own_addr)) {
257 disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
258 res = 0; /* accept any node in own cluster */
259 } else if (in_own_cluster_exact(net, disc_domain))
260 res = 0; /* accept specified node in own cluster */
261 }
262 if (res) {
263 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
264 name);
265 return -EINVAL;
266 }
267 if ((priority > TIPC_MAX_LINK_PRI) &&
268 (priority != TIPC_MEDIA_LINK_PRI)) {
269 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
270 return -EINVAL;
271 }
272
273 m = tipc_media_find(b_names.media_name);
274 if (!m) {
275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
276 name, b_names.media_name);
277 return -EINVAL;
278 }
279
280 if (priority == TIPC_MEDIA_LINK_PRI)
281 priority = m->priority;
282
283 restart:
284 bearer_id = MAX_BEARERS;
285 with_this_prio = 1;
286 for (i = MAX_BEARERS; i-- != 0; ) {
287 b = rtnl_dereference(tn->bearer_list[i]);
288 if (!b) {
289 bearer_id = i;
290 continue;
291 }
292 if (!strcmp(name, b->name)) {
293 pr_warn("Bearer <%s> rejected, already enabled\n",
294 name);
295 return -EINVAL;
296 }
297 if ((b->priority == priority) &&
298 (++with_this_prio > 2)) {
299 if (priority-- == 0) {
300 pr_warn("Bearer <%s> rejected, duplicate priority\n",
301 name);
302 return -EINVAL;
303 }
304 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
305 name, priority + 1, priority);
306 goto restart;
307 }
308 }
309 if (bearer_id >= MAX_BEARERS) {
310 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
311 name, MAX_BEARERS);
312 return -EINVAL;
313 }
314
315 b = kzalloc(sizeof(*b), GFP_ATOMIC);
316 if (!b)
317 return -ENOMEM;
318
319 strcpy(b->name, name);
320 b->media = m;
321 res = m->enable_media(net, b, attr);
322 if (res) {
323 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
324 name, -res);
325 return -EINVAL;
326 }
327
328 b->identity = bearer_id;
329 b->tolerance = m->tolerance;
330 b->window = m->window;
331 b->domain = disc_domain;
332 b->net_plane = bearer_id + 'A';
333 b->priority = priority;
334 test_and_set_bit_lock(0, &b->up);
335
336 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
337 if (res) {
338 bearer_disable(net, b);
339 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
340 name);
341 return -EINVAL;
342 }
343
344 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
345 if (skb)
346 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
347
348 if (tipc_mon_create(net, bearer_id))
349 return -ENOMEM;
350
351 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
352 name,
353 tipc_addr_string_fill(addr_string, disc_domain), priority);
354 return res;
355 }
356
357 /**
358 * tipc_reset_bearer - Reset all links established over this bearer
359 */
360 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
361 {
362 pr_info("Resetting bearer <%s>\n", b->name);
363 tipc_node_delete_links(net, b->identity);
364 tipc_disc_reset(net, b);
365 return 0;
366 }
367
368 /* tipc_bearer_reset_all - reset all links on all bearers
369 */
370 void tipc_bearer_reset_all(struct net *net)
371 {
372 struct tipc_bearer *b;
373 int i;
374
375 for (i = 0; i < MAX_BEARERS; i++) {
376 b = bearer_get(net, i);
377 if (b)
378 clear_bit_unlock(0, &b->up);
379 }
380 for (i = 0; i < MAX_BEARERS; i++) {
381 b = bearer_get(net, i);
382 if (b)
383 tipc_reset_bearer(net, b);
384 }
385 for (i = 0; i < MAX_BEARERS; i++) {
386 b = bearer_get(net, i);
387 if (b)
388 test_and_set_bit_lock(0, &b->up);
389 }
390 }
391
392 /**
393 * bearer_disable
394 *
395 * Note: This routine assumes caller holds RTNL lock.
396 */
397 static void bearer_disable(struct net *net, struct tipc_bearer *b)
398 {
399 struct tipc_net *tn = tipc_net(net);
400 int bearer_id = b->identity;
401
402 pr_info("Disabling bearer <%s>\n", b->name);
403 clear_bit_unlock(0, &b->up);
404 tipc_node_delete_links(net, bearer_id);
405 b->media->disable_media(b);
406 RCU_INIT_POINTER(b->media_ptr, NULL);
407 if (b->link_req)
408 tipc_disc_delete(b->link_req);
409 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
410 kfree_rcu(b, rcu);
411 tipc_mon_delete(net, bearer_id);
412 }
413
414 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
415 struct nlattr *attr[])
416 {
417 struct net_device *dev;
418 char *driver_name = strchr((const char *)b->name, ':') + 1;
419
420 /* Find device with specified name */
421 dev = dev_get_by_name(net, driver_name);
422 if (!dev)
423 return -ENODEV;
424 if (tipc_mtu_bad(dev, 0)) {
425 dev_put(dev);
426 return -EINVAL;
427 }
428
429 /* Associate TIPC bearer with L2 bearer */
430 rcu_assign_pointer(b->media_ptr, dev);
431 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
432 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
433 b->bcast_addr.media_id = b->media->type_id;
434 b->bcast_addr.broadcast = 1;
435 b->mtu = dev->mtu;
436 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
437 rcu_assign_pointer(dev->tipc_ptr, b);
438 return 0;
439 }
440
441 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
442 *
443 * Mark L2 bearer as inactive so that incoming buffers are thrown away
444 */
445 void tipc_disable_l2_media(struct tipc_bearer *b)
446 {
447 struct net_device *dev;
448
449 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
450 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
451 synchronize_net();
452 dev_put(dev);
453 }
454
455 /**
456 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
457 * @skb: the packet to be sent
458 * @b: the bearer through which the packet is to be sent
459 * @dest: peer destination address
460 */
461 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
462 struct tipc_bearer *b, struct tipc_media_addr *dest)
463 {
464 struct net_device *dev;
465 int delta;
466
467 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
468 if (!dev)
469 return 0;
470
471 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
472 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
473 kfree_skb(skb);
474 return 0;
475 }
476 skb_reset_network_header(skb);
477 skb->dev = dev;
478 skb->protocol = htons(ETH_P_TIPC);
479 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
480 dev->dev_addr, skb->len);
481 dev_queue_xmit(skb);
482 return 0;
483 }
484
485 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
486 {
487 int mtu = 0;
488 struct tipc_bearer *b;
489
490 rcu_read_lock();
491 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
492 if (b)
493 mtu = b->mtu;
494 rcu_read_unlock();
495 return mtu;
496 }
497
498 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
499 */
500 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
501 struct sk_buff *skb,
502 struct tipc_media_addr *dest)
503 {
504 struct tipc_msg *hdr = buf_msg(skb);
505 struct tipc_bearer *b;
506
507 rcu_read_lock();
508 b = bearer_get(net, bearer_id);
509 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
510 b->media->send_msg(net, skb, b, dest);
511 else
512 kfree_skb(skb);
513 rcu_read_unlock();
514 }
515
516 /* tipc_bearer_xmit() -send buffer to destination over bearer
517 */
518 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
519 struct sk_buff_head *xmitq,
520 struct tipc_media_addr *dst)
521 {
522 struct tipc_bearer *b;
523 struct sk_buff *skb, *tmp;
524
525 if (skb_queue_empty(xmitq))
526 return;
527
528 rcu_read_lock();
529 b = bearer_get(net, bearer_id);
530 if (unlikely(!b))
531 __skb_queue_purge(xmitq);
532 skb_queue_walk_safe(xmitq, skb, tmp) {
533 __skb_dequeue(xmitq);
534 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
535 b->media->send_msg(net, skb, b, dst);
536 else
537 kfree_skb(skb);
538 }
539 rcu_read_unlock();
540 }
541
542 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
543 */
544 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
545 struct sk_buff_head *xmitq)
546 {
547 struct tipc_net *tn = tipc_net(net);
548 int net_id = tn->net_id;
549 struct tipc_bearer *b;
550 struct sk_buff *skb, *tmp;
551 struct tipc_msg *hdr;
552
553 rcu_read_lock();
554 b = bearer_get(net, bearer_id);
555 if (unlikely(!b || !test_bit(0, &b->up)))
556 __skb_queue_purge(xmitq);
557 skb_queue_walk_safe(xmitq, skb, tmp) {
558 hdr = buf_msg(skb);
559 msg_set_non_seq(hdr, 1);
560 msg_set_mc_netid(hdr, net_id);
561 __skb_dequeue(xmitq);
562 b->media->send_msg(net, skb, b, &b->bcast_addr);
563 }
564 rcu_read_unlock();
565 }
566
567 /**
568 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
569 * @buf: the received packet
570 * @dev: the net device that the packet was received on
571 * @pt: the packet_type structure which was used to register this handler
572 * @orig_dev: the original receive net device in case the device is a bond
573 *
574 * Accept only packets explicitly sent to this node, or broadcast packets;
575 * ignores packets sent using interface multicast, and traffic sent to other
576 * nodes (which can happen if interface is running in promiscuous mode).
577 */
578 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
579 struct packet_type *pt, struct net_device *orig_dev)
580 {
581 struct tipc_bearer *b;
582
583 rcu_read_lock();
584 b = rcu_dereference_rtnl(dev->tipc_ptr);
585 if (likely(b && test_bit(0, &b->up) &&
586 (skb->pkt_type <= PACKET_BROADCAST))) {
587 skb->next = NULL;
588 tipc_rcv(dev_net(dev), skb, b);
589 rcu_read_unlock();
590 return NET_RX_SUCCESS;
591 }
592 rcu_read_unlock();
593 kfree_skb(skb);
594 return NET_RX_DROP;
595 }
596
597 /**
598 * tipc_l2_device_event - handle device events from network device
599 * @nb: the context of the notification
600 * @evt: the type of event
601 * @ptr: the net device that the event was on
602 *
603 * This function is called by the Ethernet driver in case of link
604 * change event.
605 */
606 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
607 void *ptr)
608 {
609 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
610 struct net *net = dev_net(dev);
611 struct tipc_bearer *b;
612
613 b = rtnl_dereference(dev->tipc_ptr);
614 if (!b)
615 return NOTIFY_DONE;
616
617 switch (evt) {
618 case NETDEV_CHANGE:
619 if (netif_carrier_ok(dev))
620 break;
621 case NETDEV_UP:
622 test_and_set_bit_lock(0, &b->up);
623 break;
624 case NETDEV_GOING_DOWN:
625 clear_bit_unlock(0, &b->up);
626 tipc_reset_bearer(net, b);
627 break;
628 case NETDEV_CHANGEMTU:
629 if (tipc_mtu_bad(dev, 0)) {
630 bearer_disable(net, b);
631 break;
632 }
633 b->mtu = dev->mtu;
634 tipc_reset_bearer(net, b);
635 break;
636 case NETDEV_CHANGEADDR:
637 b->media->raw2addr(b, &b->addr,
638 (char *)dev->dev_addr);
639 tipc_reset_bearer(net, b);
640 break;
641 case NETDEV_UNREGISTER:
642 case NETDEV_CHANGENAME:
643 bearer_disable(dev_net(dev), b);
644 break;
645 }
646 return NOTIFY_OK;
647 }
648
649 static struct packet_type tipc_packet_type __read_mostly = {
650 .type = htons(ETH_P_TIPC),
651 .func = tipc_l2_rcv_msg,
652 };
653
654 static struct notifier_block notifier = {
655 .notifier_call = tipc_l2_device_event,
656 .priority = 0,
657 };
658
659 int tipc_bearer_setup(void)
660 {
661 int err;
662
663 err = register_netdevice_notifier(&notifier);
664 if (err)
665 return err;
666 dev_add_pack(&tipc_packet_type);
667 return 0;
668 }
669
670 void tipc_bearer_cleanup(void)
671 {
672 unregister_netdevice_notifier(&notifier);
673 dev_remove_pack(&tipc_packet_type);
674 }
675
676 void tipc_bearer_stop(struct net *net)
677 {
678 struct tipc_net *tn = net_generic(net, tipc_net_id);
679 struct tipc_bearer *b;
680 u32 i;
681
682 for (i = 0; i < MAX_BEARERS; i++) {
683 b = rtnl_dereference(tn->bearer_list[i]);
684 if (b) {
685 bearer_disable(net, b);
686 tn->bearer_list[i] = NULL;
687 }
688 }
689 }
690
691 /* Caller should hold rtnl_lock to protect the bearer */
692 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
693 struct tipc_bearer *bearer, int nlflags)
694 {
695 void *hdr;
696 struct nlattr *attrs;
697 struct nlattr *prop;
698
699 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
700 nlflags, TIPC_NL_BEARER_GET);
701 if (!hdr)
702 return -EMSGSIZE;
703
704 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
705 if (!attrs)
706 goto msg_full;
707
708 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
709 goto attr_msg_full;
710
711 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
712 if (!prop)
713 goto prop_msg_full;
714 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
715 goto prop_msg_full;
716 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
717 goto prop_msg_full;
718 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
719 goto prop_msg_full;
720
721 nla_nest_end(msg->skb, prop);
722
723 #ifdef CONFIG_TIPC_MEDIA_UDP
724 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
725 if (tipc_udp_nl_add_bearer_data(msg, bearer))
726 goto attr_msg_full;
727 }
728 #endif
729
730 nla_nest_end(msg->skb, attrs);
731 genlmsg_end(msg->skb, hdr);
732
733 return 0;
734
735 prop_msg_full:
736 nla_nest_cancel(msg->skb, prop);
737 attr_msg_full:
738 nla_nest_cancel(msg->skb, attrs);
739 msg_full:
740 genlmsg_cancel(msg->skb, hdr);
741
742 return -EMSGSIZE;
743 }
744
745 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
746 {
747 int err;
748 int i = cb->args[0];
749 struct tipc_bearer *bearer;
750 struct tipc_nl_msg msg;
751 struct net *net = sock_net(skb->sk);
752 struct tipc_net *tn = net_generic(net, tipc_net_id);
753
754 if (i == MAX_BEARERS)
755 return 0;
756
757 msg.skb = skb;
758 msg.portid = NETLINK_CB(cb->skb).portid;
759 msg.seq = cb->nlh->nlmsg_seq;
760
761 rtnl_lock();
762 for (i = 0; i < MAX_BEARERS; i++) {
763 bearer = rtnl_dereference(tn->bearer_list[i]);
764 if (!bearer)
765 continue;
766
767 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
768 if (err)
769 break;
770 }
771 rtnl_unlock();
772
773 cb->args[0] = i;
774 return skb->len;
775 }
776
777 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
778 {
779 int err;
780 char *name;
781 struct sk_buff *rep;
782 struct tipc_bearer *bearer;
783 struct tipc_nl_msg msg;
784 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
785 struct net *net = genl_info_net(info);
786
787 if (!info->attrs[TIPC_NLA_BEARER])
788 return -EINVAL;
789
790 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
791 info->attrs[TIPC_NLA_BEARER],
792 tipc_nl_bearer_policy);
793 if (err)
794 return err;
795
796 if (!attrs[TIPC_NLA_BEARER_NAME])
797 return -EINVAL;
798 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
799
800 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
801 if (!rep)
802 return -ENOMEM;
803
804 msg.skb = rep;
805 msg.portid = info->snd_portid;
806 msg.seq = info->snd_seq;
807
808 rtnl_lock();
809 bearer = tipc_bearer_find(net, name);
810 if (!bearer) {
811 err = -EINVAL;
812 goto err_out;
813 }
814
815 err = __tipc_nl_add_bearer(&msg, bearer, 0);
816 if (err)
817 goto err_out;
818 rtnl_unlock();
819
820 return genlmsg_reply(rep, info);
821 err_out:
822 rtnl_unlock();
823 nlmsg_free(rep);
824
825 return err;
826 }
827
828 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
829 {
830 int err;
831 char *name;
832 struct tipc_bearer *bearer;
833 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
834 struct net *net = sock_net(skb->sk);
835
836 if (!info->attrs[TIPC_NLA_BEARER])
837 return -EINVAL;
838
839 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
840 info->attrs[TIPC_NLA_BEARER],
841 tipc_nl_bearer_policy);
842 if (err)
843 return err;
844
845 if (!attrs[TIPC_NLA_BEARER_NAME])
846 return -EINVAL;
847
848 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
849
850 rtnl_lock();
851 bearer = tipc_bearer_find(net, name);
852 if (!bearer) {
853 rtnl_unlock();
854 return -EINVAL;
855 }
856
857 bearer_disable(net, bearer);
858 rtnl_unlock();
859
860 return 0;
861 }
862
863 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
864 {
865 int err;
866 char *bearer;
867 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
868 struct net *net = sock_net(skb->sk);
869 struct tipc_net *tn = net_generic(net, tipc_net_id);
870 u32 domain;
871 u32 prio;
872
873 prio = TIPC_MEDIA_LINK_PRI;
874 domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
875
876 if (!info->attrs[TIPC_NLA_BEARER])
877 return -EINVAL;
878
879 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
880 info->attrs[TIPC_NLA_BEARER],
881 tipc_nl_bearer_policy);
882 if (err)
883 return err;
884
885 if (!attrs[TIPC_NLA_BEARER_NAME])
886 return -EINVAL;
887
888 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
889
890 if (attrs[TIPC_NLA_BEARER_DOMAIN])
891 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
892
893 if (attrs[TIPC_NLA_BEARER_PROP]) {
894 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
895
896 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
897 props);
898 if (err)
899 return err;
900
901 if (props[TIPC_NLA_PROP_PRIO])
902 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
903 }
904
905 rtnl_lock();
906 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
907 if (err) {
908 rtnl_unlock();
909 return err;
910 }
911 rtnl_unlock();
912
913 return 0;
914 }
915
916 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
917 {
918 int err;
919 char *name;
920 struct tipc_bearer *b;
921 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
922 struct net *net = sock_net(skb->sk);
923
924 if (!info->attrs[TIPC_NLA_BEARER])
925 return -EINVAL;
926
927 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
928 info->attrs[TIPC_NLA_BEARER],
929 tipc_nl_bearer_policy);
930 if (err)
931 return err;
932
933 if (!attrs[TIPC_NLA_BEARER_NAME])
934 return -EINVAL;
935 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
936
937 rtnl_lock();
938 b = tipc_bearer_find(net, name);
939 if (!b) {
940 rtnl_unlock();
941 return -EINVAL;
942 }
943
944 #ifdef CONFIG_TIPC_MEDIA_UDP
945 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
946 err = tipc_udp_nl_bearer_add(b,
947 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
948 if (err) {
949 rtnl_unlock();
950 return err;
951 }
952 }
953 #endif
954 rtnl_unlock();
955
956 return 0;
957 }
958
959 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
960 {
961 int err;
962 char *name;
963 struct tipc_bearer *b;
964 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
965 struct net *net = sock_net(skb->sk);
966
967 if (!info->attrs[TIPC_NLA_BEARER])
968 return -EINVAL;
969
970 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
971 info->attrs[TIPC_NLA_BEARER],
972 tipc_nl_bearer_policy);
973 if (err)
974 return err;
975
976 if (!attrs[TIPC_NLA_BEARER_NAME])
977 return -EINVAL;
978 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
979
980 rtnl_lock();
981 b = tipc_bearer_find(net, name);
982 if (!b) {
983 rtnl_unlock();
984 return -EINVAL;
985 }
986
987 if (attrs[TIPC_NLA_BEARER_PROP]) {
988 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
989
990 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
991 props);
992 if (err) {
993 rtnl_unlock();
994 return err;
995 }
996
997 if (props[TIPC_NLA_PROP_TOL])
998 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
999 if (props[TIPC_NLA_PROP_PRIO])
1000 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1001 if (props[TIPC_NLA_PROP_WIN])
1002 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1003 }
1004 rtnl_unlock();
1005
1006 return 0;
1007 }
1008
1009 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1010 struct tipc_media *media, int nlflags)
1011 {
1012 void *hdr;
1013 struct nlattr *attrs;
1014 struct nlattr *prop;
1015
1016 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1017 nlflags, TIPC_NL_MEDIA_GET);
1018 if (!hdr)
1019 return -EMSGSIZE;
1020
1021 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1022 if (!attrs)
1023 goto msg_full;
1024
1025 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1026 goto attr_msg_full;
1027
1028 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1029 if (!prop)
1030 goto prop_msg_full;
1031 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1032 goto prop_msg_full;
1033 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1034 goto prop_msg_full;
1035 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1036 goto prop_msg_full;
1037
1038 nla_nest_end(msg->skb, prop);
1039 nla_nest_end(msg->skb, attrs);
1040 genlmsg_end(msg->skb, hdr);
1041
1042 return 0;
1043
1044 prop_msg_full:
1045 nla_nest_cancel(msg->skb, prop);
1046 attr_msg_full:
1047 nla_nest_cancel(msg->skb, attrs);
1048 msg_full:
1049 genlmsg_cancel(msg->skb, hdr);
1050
1051 return -EMSGSIZE;
1052 }
1053
1054 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1055 {
1056 int err;
1057 int i = cb->args[0];
1058 struct tipc_nl_msg msg;
1059
1060 if (i == MAX_MEDIA)
1061 return 0;
1062
1063 msg.skb = skb;
1064 msg.portid = NETLINK_CB(cb->skb).portid;
1065 msg.seq = cb->nlh->nlmsg_seq;
1066
1067 rtnl_lock();
1068 for (; media_info_array[i] != NULL; i++) {
1069 err = __tipc_nl_add_media(&msg, media_info_array[i],
1070 NLM_F_MULTI);
1071 if (err)
1072 break;
1073 }
1074 rtnl_unlock();
1075
1076 cb->args[0] = i;
1077 return skb->len;
1078 }
1079
1080 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1081 {
1082 int err;
1083 char *name;
1084 struct tipc_nl_msg msg;
1085 struct tipc_media *media;
1086 struct sk_buff *rep;
1087 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1088
1089 if (!info->attrs[TIPC_NLA_MEDIA])
1090 return -EINVAL;
1091
1092 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1093 info->attrs[TIPC_NLA_MEDIA],
1094 tipc_nl_media_policy);
1095 if (err)
1096 return err;
1097
1098 if (!attrs[TIPC_NLA_MEDIA_NAME])
1099 return -EINVAL;
1100 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1101
1102 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1103 if (!rep)
1104 return -ENOMEM;
1105
1106 msg.skb = rep;
1107 msg.portid = info->snd_portid;
1108 msg.seq = info->snd_seq;
1109
1110 rtnl_lock();
1111 media = tipc_media_find(name);
1112 if (!media) {
1113 err = -EINVAL;
1114 goto err_out;
1115 }
1116
1117 err = __tipc_nl_add_media(&msg, media, 0);
1118 if (err)
1119 goto err_out;
1120 rtnl_unlock();
1121
1122 return genlmsg_reply(rep, info);
1123 err_out:
1124 rtnl_unlock();
1125 nlmsg_free(rep);
1126
1127 return err;
1128 }
1129
1130 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1131 {
1132 int err;
1133 char *name;
1134 struct tipc_media *m;
1135 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1136
1137 if (!info->attrs[TIPC_NLA_MEDIA])
1138 return -EINVAL;
1139
1140 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1141 info->attrs[TIPC_NLA_MEDIA],
1142 tipc_nl_media_policy);
1143
1144 if (!attrs[TIPC_NLA_MEDIA_NAME])
1145 return -EINVAL;
1146 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1147
1148 rtnl_lock();
1149 m = tipc_media_find(name);
1150 if (!m) {
1151 rtnl_unlock();
1152 return -EINVAL;
1153 }
1154
1155 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1156 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1157
1158 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1159 props);
1160 if (err) {
1161 rtnl_unlock();
1162 return err;
1163 }
1164
1165 if (props[TIPC_NLA_PROP_TOL])
1166 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1167 if (props[TIPC_NLA_PROP_PRIO])
1168 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1169 if (props[TIPC_NLA_PROP_WIN])
1170 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1171 }
1172 rtnl_unlock();
1173
1174 return 0;
1175 }
Linux with added FPC-III support