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TOMOYO Linux Cross Reference
Linux/net/tipc/bearer.c

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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 
 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 static 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  */
 74 struct 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  */
 88 static 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  */
102 void 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  */
129 static 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  */
170 struct 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  */
189 int 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 
205 void 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->link_req);
214         rcu_read_unlock();
215 }
216 
217 void 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->link_req);
226         rcu_read_unlock();
227 }
228 
229 /**
230  * tipc_enable_bearer - enable bearer with the given name
231  */
232 static int tipc_enable_bearer(struct net *net, const char *name,
233                               u32 disc_domain, u32 priority,
234                               struct nlattr *attr[])
235 {
236         struct tipc_net *tn = net_generic(net, tipc_net_id);
237         struct tipc_bearer *b;
238         struct tipc_media *m;
239         struct tipc_bearer_names b_names;
240         struct sk_buff *skb;
241         char addr_string[16];
242         u32 bearer_id;
243         u32 with_this_prio;
244         u32 i;
245         int res = -EINVAL;
246 
247         if (!tn->own_addr) {
248                 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
249                         name);
250                 return -ENOPROTOOPT;
251         }
252         if (!bearer_name_validate(name, &b_names)) {
253                 pr_warn("Bearer <%s> rejected, illegal name\n", name);
254                 return -EINVAL;
255         }
256         if (tipc_addr_domain_valid(disc_domain) &&
257             (disc_domain != tn->own_addr)) {
258                 if (tipc_in_scope(disc_domain, tn->own_addr)) {
259                         disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
260                         res = 0;   /* accept any node in own cluster */
261                 } else if (in_own_cluster_exact(net, disc_domain))
262                         res = 0;   /* accept specified node in own cluster */
263         }
264         if (res) {
265                 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
266                         name);
267                 return -EINVAL;
268         }
269         if ((priority > TIPC_MAX_LINK_PRI) &&
270             (priority != TIPC_MEDIA_LINK_PRI)) {
271                 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
272                 return -EINVAL;
273         }
274 
275         m = tipc_media_find(b_names.media_name);
276         if (!m) {
277                 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
278                         name, b_names.media_name);
279                 return -EINVAL;
280         }
281 
282         if (priority == TIPC_MEDIA_LINK_PRI)
283                 priority = m->priority;
284 
285 restart:
286         bearer_id = MAX_BEARERS;
287         with_this_prio = 1;
288         for (i = MAX_BEARERS; i-- != 0; ) {
289                 b = rtnl_dereference(tn->bearer_list[i]);
290                 if (!b) {
291                         bearer_id = i;
292                         continue;
293                 }
294                 if (!strcmp(name, b->name)) {
295                         pr_warn("Bearer <%s> rejected, already enabled\n",
296                                 name);
297                         return -EINVAL;
298                 }
299                 if ((b->priority == priority) &&
300                     (++with_this_prio > 2)) {
301                         if (priority-- == 0) {
302                                 pr_warn("Bearer <%s> rejected, duplicate priority\n",
303                                         name);
304                                 return -EINVAL;
305                         }
306                         pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
307                                 name, priority + 1, priority);
308                         goto restart;
309                 }
310         }
311         if (bearer_id >= MAX_BEARERS) {
312                 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
313                         name, MAX_BEARERS);
314                 return -EINVAL;
315         }
316 
317         b = kzalloc(sizeof(*b), GFP_ATOMIC);
318         if (!b)
319                 return -ENOMEM;
320 
321         strcpy(b->name, name);
322         b->media = m;
323         res = m->enable_media(net, b, attr);
324         if (res) {
325                 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
326                         name, -res);
327                 kfree(b);
328                 return -EINVAL;
329         }
330 
331         b->identity = bearer_id;
332         b->tolerance = m->tolerance;
333         b->window = m->window;
334         b->domain = disc_domain;
335         b->net_plane = bearer_id + 'A';
336         b->priority = priority;
337         test_and_set_bit_lock(0, &b->up);
338 
339         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
340         if (res) {
341                 bearer_disable(net, b);
342                 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
343                         name);
344                 return -EINVAL;
345         }
346 
347         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
348         if (skb)
349                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
350 
351         if (tipc_mon_create(net, bearer_id)) {
352                 bearer_disable(net, b);
353                 return -ENOMEM;
354         }
355 
356         pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
357                 name,
358                 tipc_addr_string_fill(addr_string, disc_domain), priority);
359         return res;
360 }
361 
362 /**
363  * tipc_reset_bearer - Reset all links established over this bearer
364  */
365 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
366 {
367         pr_info("Resetting bearer <%s>\n", b->name);
368         tipc_node_delete_links(net, b->identity);
369         tipc_disc_reset(net, b);
370         return 0;
371 }
372 
373 /**
374  * bearer_disable
375  *
376  * Note: This routine assumes caller holds RTNL lock.
377  */
378 static void bearer_disable(struct net *net, struct tipc_bearer *b)
379 {
380         struct tipc_net *tn = tipc_net(net);
381         int bearer_id = b->identity;
382 
383         pr_info("Disabling bearer <%s>\n", b->name);
384         clear_bit_unlock(0, &b->up);
385         tipc_node_delete_links(net, bearer_id);
386         b->media->disable_media(b);
387         RCU_INIT_POINTER(b->media_ptr, NULL);
388         if (b->link_req)
389                 tipc_disc_delete(b->link_req);
390         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
391         kfree_rcu(b, rcu);
392         tipc_mon_delete(net, bearer_id);
393 }
394 
395 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
396                          struct nlattr *attr[])
397 {
398         struct net_device *dev;
399         char *driver_name = strchr((const char *)b->name, ':') + 1;
400 
401         /* Find device with specified name */
402         dev = dev_get_by_name(net, driver_name);
403         if (!dev)
404                 return -ENODEV;
405         if (tipc_mtu_bad(dev, 0)) {
406                 dev_put(dev);
407                 return -EINVAL;
408         }
409 
410         /* Associate TIPC bearer with L2 bearer */
411         rcu_assign_pointer(b->media_ptr, dev);
412         b->pt.dev = dev;
413         b->pt.type = htons(ETH_P_TIPC);
414         b->pt.func = tipc_l2_rcv_msg;
415         dev_add_pack(&b->pt);
416         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
417         memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
418         b->bcast_addr.media_id = b->media->type_id;
419         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
420         b->mtu = dev->mtu;
421         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
422         rcu_assign_pointer(dev->tipc_ptr, b);
423         return 0;
424 }
425 
426 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
427  *
428  * Mark L2 bearer as inactive so that incoming buffers are thrown away
429  */
430 void tipc_disable_l2_media(struct tipc_bearer *b)
431 {
432         struct net_device *dev;
433 
434         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
435         dev_remove_pack(&b->pt);
436         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
437         synchronize_net();
438         dev_put(dev);
439 }
440 
441 /**
442  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
443  * @skb: the packet to be sent
444  * @b: the bearer through which the packet is to be sent
445  * @dest: peer destination address
446  */
447 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
448                      struct tipc_bearer *b, struct tipc_media_addr *dest)
449 {
450         struct net_device *dev;
451         int delta;
452 
453         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
454         if (!dev)
455                 return 0;
456 
457         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
458         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
459                 kfree_skb(skb);
460                 return 0;
461         }
462         skb_reset_network_header(skb);
463         skb->dev = dev;
464         skb->protocol = htons(ETH_P_TIPC);
465         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
466                         dev->dev_addr, skb->len);
467         dev_queue_xmit(skb);
468         return 0;
469 }
470 
471 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
472 {
473         bool supp = false;
474         struct tipc_bearer *b;
475 
476         rcu_read_lock();
477         b = bearer_get(net, bearer_id);
478         if (b)
479                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
480         rcu_read_unlock();
481         return supp;
482 }
483 
484 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
485 {
486         int mtu = 0;
487         struct tipc_bearer *b;
488 
489         rcu_read_lock();
490         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
491         if (b)
492                 mtu = b->mtu;
493         rcu_read_unlock();
494         return mtu;
495 }
496 
497 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
498  */
499 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
500                           struct sk_buff *skb,
501                           struct tipc_media_addr *dest)
502 {
503         struct tipc_msg *hdr = buf_msg(skb);
504         struct tipc_bearer *b;
505 
506         rcu_read_lock();
507         b = bearer_get(net, bearer_id);
508         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
509                 b->media->send_msg(net, skb, b, dest);
510         else
511                 kfree_skb(skb);
512         rcu_read_unlock();
513 }
514 
515 /* tipc_bearer_xmit() -send buffer to destination over bearer
516  */
517 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
518                       struct sk_buff_head *xmitq,
519                       struct tipc_media_addr *dst)
520 {
521         struct tipc_bearer *b;
522         struct sk_buff *skb, *tmp;
523 
524         if (skb_queue_empty(xmitq))
525                 return;
526 
527         rcu_read_lock();
528         b = bearer_get(net, bearer_id);
529         if (unlikely(!b))
530                 __skb_queue_purge(xmitq);
531         skb_queue_walk_safe(xmitq, skb, tmp) {
532                 __skb_dequeue(xmitq);
533                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
534                         b->media->send_msg(net, skb, b, dst);
535                 else
536                         kfree_skb(skb);
537         }
538         rcu_read_unlock();
539 }
540 
541 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
542  */
543 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
544                          struct sk_buff_head *xmitq)
545 {
546         struct tipc_net *tn = tipc_net(net);
547         int net_id = tn->net_id;
548         struct tipc_bearer *b;
549         struct sk_buff *skb, *tmp;
550         struct tipc_msg *hdr;
551 
552         rcu_read_lock();
553         b = bearer_get(net, bearer_id);
554         if (unlikely(!b || !test_bit(0, &b->up)))
555                 __skb_queue_purge(xmitq);
556         skb_queue_walk_safe(xmitq, skb, tmp) {
557                 hdr = buf_msg(skb);
558                 msg_set_non_seq(hdr, 1);
559                 msg_set_mc_netid(hdr, net_id);
560                 __skb_dequeue(xmitq);
561                 b->media->send_msg(net, skb, b, &b->bcast_addr);
562         }
563         rcu_read_unlock();
564 }
565 
566 /**
567  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
568  * @buf: the received packet
569  * @dev: the net device that the packet was received on
570  * @pt: the packet_type structure which was used to register this handler
571  * @orig_dev: the original receive net device in case the device is a bond
572  *
573  * Accept only packets explicitly sent to this node, or broadcast packets;
574  * ignores packets sent using interface multicast, and traffic sent to other
575  * nodes (which can happen if interface is running in promiscuous mode).
576  */
577 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
578                            struct packet_type *pt, struct net_device *orig_dev)
579 {
580         struct tipc_bearer *b;
581 
582         rcu_read_lock();
583         b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
584                 rcu_dereference_rtnl(orig_dev->tipc_ptr);
585         if (likely(b && test_bit(0, &b->up) &&
586                    (skb->pkt_type <= PACKET_MULTICAST))) {
587                 skb->next = NULL;
588                 tipc_rcv(dev_net(b->pt.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(net, b);
644                 break;
645         }
646         return NOTIFY_OK;
647 }
648 
649 static struct notifier_block notifier = {
650         .notifier_call  = tipc_l2_device_event,
651         .priority       = 0,
652 };
653 
654 int tipc_bearer_setup(void)
655 {
656         return register_netdevice_notifier(&notifier);
657 }
658 
659 void tipc_bearer_cleanup(void)
660 {
661         unregister_netdevice_notifier(&notifier);
662 }
663 
664 void tipc_bearer_stop(struct net *net)
665 {
666         struct tipc_net *tn = net_generic(net, tipc_net_id);
667         struct tipc_bearer *b;
668         u32 i;
669 
670         for (i = 0; i < MAX_BEARERS; i++) {
671                 b = rtnl_dereference(tn->bearer_list[i]);
672                 if (b) {
673                         bearer_disable(net, b);
674                         tn->bearer_list[i] = NULL;
675                 }
676         }
677 }
678 
679 /* Caller should hold rtnl_lock to protect the bearer */
680 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
681                                 struct tipc_bearer *bearer, int nlflags)
682 {
683         void *hdr;
684         struct nlattr *attrs;
685         struct nlattr *prop;
686 
687         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
688                           nlflags, TIPC_NL_BEARER_GET);
689         if (!hdr)
690                 return -EMSGSIZE;
691 
692         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
693         if (!attrs)
694                 goto msg_full;
695 
696         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
697                 goto attr_msg_full;
698 
699         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
700         if (!prop)
701                 goto prop_msg_full;
702         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
703                 goto prop_msg_full;
704         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
705                 goto prop_msg_full;
706         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
707                 goto prop_msg_full;
708 
709         nla_nest_end(msg->skb, prop);
710 
711 #ifdef CONFIG_TIPC_MEDIA_UDP
712         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
713                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
714                         goto attr_msg_full;
715         }
716 #endif
717 
718         nla_nest_end(msg->skb, attrs);
719         genlmsg_end(msg->skb, hdr);
720 
721         return 0;
722 
723 prop_msg_full:
724         nla_nest_cancel(msg->skb, prop);
725 attr_msg_full:
726         nla_nest_cancel(msg->skb, attrs);
727 msg_full:
728         genlmsg_cancel(msg->skb, hdr);
729 
730         return -EMSGSIZE;
731 }
732 
733 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
734 {
735         int err;
736         int i = cb->args[0];
737         struct tipc_bearer *bearer;
738         struct tipc_nl_msg msg;
739         struct net *net = sock_net(skb->sk);
740         struct tipc_net *tn = net_generic(net, tipc_net_id);
741 
742         if (i == MAX_BEARERS)
743                 return 0;
744 
745         msg.skb = skb;
746         msg.portid = NETLINK_CB(cb->skb).portid;
747         msg.seq = cb->nlh->nlmsg_seq;
748 
749         rtnl_lock();
750         for (i = 0; i < MAX_BEARERS; i++) {
751                 bearer = rtnl_dereference(tn->bearer_list[i]);
752                 if (!bearer)
753                         continue;
754 
755                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
756                 if (err)
757                         break;
758         }
759         rtnl_unlock();
760 
761         cb->args[0] = i;
762         return skb->len;
763 }
764 
765 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
766 {
767         int err;
768         char *name;
769         struct sk_buff *rep;
770         struct tipc_bearer *bearer;
771         struct tipc_nl_msg msg;
772         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
773         struct net *net = genl_info_net(info);
774 
775         if (!info->attrs[TIPC_NLA_BEARER])
776                 return -EINVAL;
777 
778         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
779                                info->attrs[TIPC_NLA_BEARER],
780                                tipc_nl_bearer_policy, info->extack);
781         if (err)
782                 return err;
783 
784         if (!attrs[TIPC_NLA_BEARER_NAME])
785                 return -EINVAL;
786         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
787 
788         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
789         if (!rep)
790                 return -ENOMEM;
791 
792         msg.skb = rep;
793         msg.portid = info->snd_portid;
794         msg.seq = info->snd_seq;
795 
796         rtnl_lock();
797         bearer = tipc_bearer_find(net, name);
798         if (!bearer) {
799                 err = -EINVAL;
800                 goto err_out;
801         }
802 
803         err = __tipc_nl_add_bearer(&msg, bearer, 0);
804         if (err)
805                 goto err_out;
806         rtnl_unlock();
807 
808         return genlmsg_reply(rep, info);
809 err_out:
810         rtnl_unlock();
811         nlmsg_free(rep);
812 
813         return err;
814 }
815 
816 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
817 {
818         int err;
819         char *name;
820         struct tipc_bearer *bearer;
821         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
822         struct net *net = sock_net(skb->sk);
823 
824         if (!info->attrs[TIPC_NLA_BEARER])
825                 return -EINVAL;
826 
827         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
828                                info->attrs[TIPC_NLA_BEARER],
829                                tipc_nl_bearer_policy, info->extack);
830         if (err)
831                 return err;
832 
833         if (!attrs[TIPC_NLA_BEARER_NAME])
834                 return -EINVAL;
835 
836         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
837 
838         bearer = tipc_bearer_find(net, name);
839         if (!bearer)
840                 return -EINVAL;
841 
842         bearer_disable(net, bearer);
843 
844         return 0;
845 }
846 
847 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
848 {
849         int err;
850 
851         rtnl_lock();
852         err = __tipc_nl_bearer_disable(skb, info);
853         rtnl_unlock();
854 
855         return err;
856 }
857 
858 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
859 {
860         int err;
861         char *bearer;
862         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
863         struct net *net = sock_net(skb->sk);
864         struct tipc_net *tn = net_generic(net, tipc_net_id);
865         u32 domain;
866         u32 prio;
867 
868         prio = TIPC_MEDIA_LINK_PRI;
869         domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
870 
871         if (!info->attrs[TIPC_NLA_BEARER])
872                 return -EINVAL;
873 
874         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
875                                info->attrs[TIPC_NLA_BEARER],
876                                tipc_nl_bearer_policy, info->extack);
877         if (err)
878                 return err;
879 
880         if (!attrs[TIPC_NLA_BEARER_NAME])
881                 return -EINVAL;
882 
883         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
884 
885         if (attrs[TIPC_NLA_BEARER_DOMAIN])
886                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
887 
888         if (attrs[TIPC_NLA_BEARER_PROP]) {
889                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
890 
891                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
892                                               props);
893                 if (err)
894                         return err;
895 
896                 if (props[TIPC_NLA_PROP_PRIO])
897                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
898         }
899 
900         return tipc_enable_bearer(net, bearer, domain, prio, attrs);
901 }
902 
903 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
904 {
905         int err;
906 
907         rtnl_lock();
908         err = __tipc_nl_bearer_enable(skb, info);
909         rtnl_unlock();
910 
911         return err;
912 }
913 
914 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
915 {
916         int err;
917         char *name;
918         struct tipc_bearer *b;
919         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
920         struct net *net = sock_net(skb->sk);
921 
922         if (!info->attrs[TIPC_NLA_BEARER])
923                 return -EINVAL;
924 
925         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
926                                info->attrs[TIPC_NLA_BEARER],
927                                tipc_nl_bearer_policy, info->extack);
928         if (err)
929                 return err;
930 
931         if (!attrs[TIPC_NLA_BEARER_NAME])
932                 return -EINVAL;
933         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
934 
935         rtnl_lock();
936         b = tipc_bearer_find(net, name);
937         if (!b) {
938                 rtnl_unlock();
939                 return -EINVAL;
940         }
941 
942 #ifdef CONFIG_TIPC_MEDIA_UDP
943         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
944                 err = tipc_udp_nl_bearer_add(b,
945                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
946                 if (err) {
947                         rtnl_unlock();
948                         return err;
949                 }
950         }
951 #endif
952         rtnl_unlock();
953 
954         return 0;
955 }
956 
957 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
958 {
959         int err;
960         char *name;
961         struct tipc_bearer *b;
962         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
963         struct net *net = sock_net(skb->sk);
964 
965         if (!info->attrs[TIPC_NLA_BEARER])
966                 return -EINVAL;
967 
968         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
969                                info->attrs[TIPC_NLA_BEARER],
970                                tipc_nl_bearer_policy, info->extack);
971         if (err)
972                 return err;
973 
974         if (!attrs[TIPC_NLA_BEARER_NAME])
975                 return -EINVAL;
976         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
977 
978         b = tipc_bearer_find(net, name);
979         if (!b)
980                 return -EINVAL;
981 
982         if (attrs[TIPC_NLA_BEARER_PROP]) {
983                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
984 
985                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
986                                               props);
987                 if (err)
988                         return err;
989 
990                 if (props[TIPC_NLA_PROP_TOL])
991                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
992                 if (props[TIPC_NLA_PROP_PRIO])
993                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
994                 if (props[TIPC_NLA_PROP_WIN])
995                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
996         }
997 
998         return 0;
999 }
1000 
1001 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1002 {
1003         int err;
1004 
1005         rtnl_lock();
1006         err = __tipc_nl_bearer_set(skb, info);
1007         rtnl_unlock();
1008 
1009         return err;
1010 }
1011 
1012 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1013                                struct tipc_media *media, int nlflags)
1014 {
1015         void *hdr;
1016         struct nlattr *attrs;
1017         struct nlattr *prop;
1018 
1019         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1020                           nlflags, TIPC_NL_MEDIA_GET);
1021         if (!hdr)
1022                 return -EMSGSIZE;
1023 
1024         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1025         if (!attrs)
1026                 goto msg_full;
1027 
1028         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1029                 goto attr_msg_full;
1030 
1031         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1032         if (!prop)
1033                 goto prop_msg_full;
1034         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1035                 goto prop_msg_full;
1036         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1037                 goto prop_msg_full;
1038         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1039                 goto prop_msg_full;
1040 
1041         nla_nest_end(msg->skb, prop);
1042         nla_nest_end(msg->skb, attrs);
1043         genlmsg_end(msg->skb, hdr);
1044 
1045         return 0;
1046 
1047 prop_msg_full:
1048         nla_nest_cancel(msg->skb, prop);
1049 attr_msg_full:
1050         nla_nest_cancel(msg->skb, attrs);
1051 msg_full:
1052         genlmsg_cancel(msg->skb, hdr);
1053 
1054         return -EMSGSIZE;
1055 }
1056 
1057 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1058 {
1059         int err;
1060         int i = cb->args[0];
1061         struct tipc_nl_msg msg;
1062 
1063         if (i == MAX_MEDIA)
1064                 return 0;
1065 
1066         msg.skb = skb;
1067         msg.portid = NETLINK_CB(cb->skb).portid;
1068         msg.seq = cb->nlh->nlmsg_seq;
1069 
1070         rtnl_lock();
1071         for (; media_info_array[i] != NULL; i++) {
1072                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1073                                           NLM_F_MULTI);
1074                 if (err)
1075                         break;
1076         }
1077         rtnl_unlock();
1078 
1079         cb->args[0] = i;
1080         return skb->len;
1081 }
1082 
1083 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1084 {
1085         int err;
1086         char *name;
1087         struct tipc_nl_msg msg;
1088         struct tipc_media *media;
1089         struct sk_buff *rep;
1090         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1091 
1092         if (!info->attrs[TIPC_NLA_MEDIA])
1093                 return -EINVAL;
1094 
1095         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1096                                info->attrs[TIPC_NLA_MEDIA],
1097                                tipc_nl_media_policy, info->extack);
1098         if (err)
1099                 return err;
1100 
1101         if (!attrs[TIPC_NLA_MEDIA_NAME])
1102                 return -EINVAL;
1103         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1104 
1105         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1106         if (!rep)
1107                 return -ENOMEM;
1108 
1109         msg.skb = rep;
1110         msg.portid = info->snd_portid;
1111         msg.seq = info->snd_seq;
1112 
1113         rtnl_lock();
1114         media = tipc_media_find(name);
1115         if (!media) {
1116                 err = -EINVAL;
1117                 goto err_out;
1118         }
1119 
1120         err = __tipc_nl_add_media(&msg, media, 0);
1121         if (err)
1122                 goto err_out;
1123         rtnl_unlock();
1124 
1125         return genlmsg_reply(rep, info);
1126 err_out:
1127         rtnl_unlock();
1128         nlmsg_free(rep);
1129 
1130         return err;
1131 }
1132 
1133 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1134 {
1135         int err;
1136         char *name;
1137         struct tipc_media *m;
1138         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1139 
1140         if (!info->attrs[TIPC_NLA_MEDIA])
1141                 return -EINVAL;
1142 
1143         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1144                                info->attrs[TIPC_NLA_MEDIA],
1145                                tipc_nl_media_policy, info->extack);
1146 
1147         if (!attrs[TIPC_NLA_MEDIA_NAME])
1148                 return -EINVAL;
1149         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1150 
1151         m = tipc_media_find(name);
1152         if (!m)
1153                 return -EINVAL;
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                         return err;
1162 
1163                 if (props[TIPC_NLA_PROP_TOL])
1164                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1165                 if (props[TIPC_NLA_PROP_PRIO])
1166                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1167                 if (props[TIPC_NLA_PROP_WIN])
1168                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1169         }
1170 
1171         return 0;
1172 }
1173 
1174 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1175 {
1176         int err;
1177 
1178         rtnl_lock();
1179         err = __tipc_nl_media_set(skb, info);
1180         rtnl_unlock();
1181 
1182         return err;
1183 }
1184 

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