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

Version: ~ [ linux-5.2-rc4 ] ~ [ linux-5.1.9 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.50 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.125 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.181 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.181 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.68 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 
 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 = TIPC_BROADCAST_SUPPORT;
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 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
486 {
487         bool supp = false;
488         struct tipc_bearer *b;
489 
490         rcu_read_lock();
491         b = bearer_get(net, bearer_id);
492         if (b)
493                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
494         rcu_read_unlock();
495         return supp;
496 }
497 
498 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
499 {
500         int mtu = 0;
501         struct tipc_bearer *b;
502 
503         rcu_read_lock();
504         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
505         if (b)
506                 mtu = b->mtu;
507         rcu_read_unlock();
508         return mtu;
509 }
510 
511 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
512  */
513 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
514                           struct sk_buff *skb,
515                           struct tipc_media_addr *dest)
516 {
517         struct tipc_msg *hdr = buf_msg(skb);
518         struct tipc_bearer *b;
519 
520         rcu_read_lock();
521         b = bearer_get(net, bearer_id);
522         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
523                 b->media->send_msg(net, skb, b, dest);
524         else
525                 kfree_skb(skb);
526         rcu_read_unlock();
527 }
528 
529 /* tipc_bearer_xmit() -send buffer to destination over bearer
530  */
531 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
532                       struct sk_buff_head *xmitq,
533                       struct tipc_media_addr *dst)
534 {
535         struct tipc_bearer *b;
536         struct sk_buff *skb, *tmp;
537 
538         if (skb_queue_empty(xmitq))
539                 return;
540 
541         rcu_read_lock();
542         b = bearer_get(net, bearer_id);
543         if (unlikely(!b))
544                 __skb_queue_purge(xmitq);
545         skb_queue_walk_safe(xmitq, skb, tmp) {
546                 __skb_dequeue(xmitq);
547                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
548                         b->media->send_msg(net, skb, b, dst);
549                 else
550                         kfree_skb(skb);
551         }
552         rcu_read_unlock();
553 }
554 
555 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
556  */
557 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
558                          struct sk_buff_head *xmitq)
559 {
560         struct tipc_net *tn = tipc_net(net);
561         int net_id = tn->net_id;
562         struct tipc_bearer *b;
563         struct sk_buff *skb, *tmp;
564         struct tipc_msg *hdr;
565 
566         rcu_read_lock();
567         b = bearer_get(net, bearer_id);
568         if (unlikely(!b || !test_bit(0, &b->up)))
569                 __skb_queue_purge(xmitq);
570         skb_queue_walk_safe(xmitq, skb, tmp) {
571                 hdr = buf_msg(skb);
572                 msg_set_non_seq(hdr, 1);
573                 msg_set_mc_netid(hdr, net_id);
574                 __skb_dequeue(xmitq);
575                 b->media->send_msg(net, skb, b, &b->bcast_addr);
576         }
577         rcu_read_unlock();
578 }
579 
580 /**
581  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
582  * @buf: the received packet
583  * @dev: the net device that the packet was received on
584  * @pt: the packet_type structure which was used to register this handler
585  * @orig_dev: the original receive net device in case the device is a bond
586  *
587  * Accept only packets explicitly sent to this node, or broadcast packets;
588  * ignores packets sent using interface multicast, and traffic sent to other
589  * nodes (which can happen if interface is running in promiscuous mode).
590  */
591 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
592                            struct packet_type *pt, struct net_device *orig_dev)
593 {
594         struct tipc_bearer *b;
595 
596         rcu_read_lock();
597         b = rcu_dereference_rtnl(dev->tipc_ptr);
598         if (likely(b && test_bit(0, &b->up) &&
599                    (skb->pkt_type <= PACKET_BROADCAST))) {
600                 skb->next = NULL;
601                 tipc_rcv(dev_net(dev), skb, b);
602                 rcu_read_unlock();
603                 return NET_RX_SUCCESS;
604         }
605         rcu_read_unlock();
606         kfree_skb(skb);
607         return NET_RX_DROP;
608 }
609 
610 /**
611  * tipc_l2_device_event - handle device events from network device
612  * @nb: the context of the notification
613  * @evt: the type of event
614  * @ptr: the net device that the event was on
615  *
616  * This function is called by the Ethernet driver in case of link
617  * change event.
618  */
619 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
620                                 void *ptr)
621 {
622         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
623         struct net *net = dev_net(dev);
624         struct tipc_bearer *b;
625 
626         b = rtnl_dereference(dev->tipc_ptr);
627         if (!b)
628                 return NOTIFY_DONE;
629 
630         switch (evt) {
631         case NETDEV_CHANGE:
632                 if (netif_carrier_ok(dev))
633                         break;
634         case NETDEV_UP:
635                 test_and_set_bit_lock(0, &b->up);
636                 break;
637         case NETDEV_GOING_DOWN:
638                 clear_bit_unlock(0, &b->up);
639                 tipc_reset_bearer(net, b);
640                 break;
641         case NETDEV_CHANGEMTU:
642                 if (tipc_mtu_bad(dev, 0)) {
643                         bearer_disable(net, b);
644                         break;
645                 }
646                 b->mtu = dev->mtu;
647                 tipc_reset_bearer(net, b);
648                 break;
649         case NETDEV_CHANGEADDR:
650                 b->media->raw2addr(b, &b->addr,
651                                    (char *)dev->dev_addr);
652                 tipc_reset_bearer(net, b);
653                 break;
654         case NETDEV_UNREGISTER:
655         case NETDEV_CHANGENAME:
656                 bearer_disable(dev_net(dev), b);
657                 break;
658         }
659         return NOTIFY_OK;
660 }
661 
662 static struct packet_type tipc_packet_type __read_mostly = {
663         .type = htons(ETH_P_TIPC),
664         .func = tipc_l2_rcv_msg,
665 };
666 
667 static struct notifier_block notifier = {
668         .notifier_call  = tipc_l2_device_event,
669         .priority       = 0,
670 };
671 
672 int tipc_bearer_setup(void)
673 {
674         int err;
675 
676         err = register_netdevice_notifier(&notifier);
677         if (err)
678                 return err;
679         dev_add_pack(&tipc_packet_type);
680         return 0;
681 }
682 
683 void tipc_bearer_cleanup(void)
684 {
685         unregister_netdevice_notifier(&notifier);
686         dev_remove_pack(&tipc_packet_type);
687 }
688 
689 void tipc_bearer_stop(struct net *net)
690 {
691         struct tipc_net *tn = net_generic(net, tipc_net_id);
692         struct tipc_bearer *b;
693         u32 i;
694 
695         for (i = 0; i < MAX_BEARERS; i++) {
696                 b = rtnl_dereference(tn->bearer_list[i]);
697                 if (b) {
698                         bearer_disable(net, b);
699                         tn->bearer_list[i] = NULL;
700                 }
701         }
702 }
703 
704 /* Caller should hold rtnl_lock to protect the bearer */
705 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
706                                 struct tipc_bearer *bearer, int nlflags)
707 {
708         void *hdr;
709         struct nlattr *attrs;
710         struct nlattr *prop;
711 
712         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
713                           nlflags, TIPC_NL_BEARER_GET);
714         if (!hdr)
715                 return -EMSGSIZE;
716 
717         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
718         if (!attrs)
719                 goto msg_full;
720 
721         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
722                 goto attr_msg_full;
723 
724         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
725         if (!prop)
726                 goto prop_msg_full;
727         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
728                 goto prop_msg_full;
729         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
730                 goto prop_msg_full;
731         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
732                 goto prop_msg_full;
733 
734         nla_nest_end(msg->skb, prop);
735 
736 #ifdef CONFIG_TIPC_MEDIA_UDP
737         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
738                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
739                         goto attr_msg_full;
740         }
741 #endif
742 
743         nla_nest_end(msg->skb, attrs);
744         genlmsg_end(msg->skb, hdr);
745 
746         return 0;
747 
748 prop_msg_full:
749         nla_nest_cancel(msg->skb, prop);
750 attr_msg_full:
751         nla_nest_cancel(msg->skb, attrs);
752 msg_full:
753         genlmsg_cancel(msg->skb, hdr);
754 
755         return -EMSGSIZE;
756 }
757 
758 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
759 {
760         int err;
761         int i = cb->args[0];
762         struct tipc_bearer *bearer;
763         struct tipc_nl_msg msg;
764         struct net *net = sock_net(skb->sk);
765         struct tipc_net *tn = net_generic(net, tipc_net_id);
766 
767         if (i == MAX_BEARERS)
768                 return 0;
769 
770         msg.skb = skb;
771         msg.portid = NETLINK_CB(cb->skb).portid;
772         msg.seq = cb->nlh->nlmsg_seq;
773 
774         rtnl_lock();
775         for (i = 0; i < MAX_BEARERS; i++) {
776                 bearer = rtnl_dereference(tn->bearer_list[i]);
777                 if (!bearer)
778                         continue;
779 
780                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
781                 if (err)
782                         break;
783         }
784         rtnl_unlock();
785 
786         cb->args[0] = i;
787         return skb->len;
788 }
789 
790 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
791 {
792         int err;
793         char *name;
794         struct sk_buff *rep;
795         struct tipc_bearer *bearer;
796         struct tipc_nl_msg msg;
797         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
798         struct net *net = genl_info_net(info);
799 
800         if (!info->attrs[TIPC_NLA_BEARER])
801                 return -EINVAL;
802 
803         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
804                                info->attrs[TIPC_NLA_BEARER],
805                                tipc_nl_bearer_policy);
806         if (err)
807                 return err;
808 
809         if (!attrs[TIPC_NLA_BEARER_NAME])
810                 return -EINVAL;
811         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
812 
813         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
814         if (!rep)
815                 return -ENOMEM;
816 
817         msg.skb = rep;
818         msg.portid = info->snd_portid;
819         msg.seq = info->snd_seq;
820 
821         rtnl_lock();
822         bearer = tipc_bearer_find(net, name);
823         if (!bearer) {
824                 err = -EINVAL;
825                 goto err_out;
826         }
827 
828         err = __tipc_nl_add_bearer(&msg, bearer, 0);
829         if (err)
830                 goto err_out;
831         rtnl_unlock();
832 
833         return genlmsg_reply(rep, info);
834 err_out:
835         rtnl_unlock();
836         nlmsg_free(rep);
837 
838         return err;
839 }
840 
841 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
842 {
843         int err;
844         char *name;
845         struct tipc_bearer *bearer;
846         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
847         struct net *net = sock_net(skb->sk);
848 
849         if (!info->attrs[TIPC_NLA_BEARER])
850                 return -EINVAL;
851 
852         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
853                                info->attrs[TIPC_NLA_BEARER],
854                                tipc_nl_bearer_policy);
855         if (err)
856                 return err;
857 
858         if (!attrs[TIPC_NLA_BEARER_NAME])
859                 return -EINVAL;
860 
861         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
862 
863         rtnl_lock();
864         bearer = tipc_bearer_find(net, name);
865         if (!bearer) {
866                 rtnl_unlock();
867                 return -EINVAL;
868         }
869 
870         bearer_disable(net, bearer);
871         rtnl_unlock();
872 
873         return 0;
874 }
875 
876 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
877 {
878         int err;
879         char *bearer;
880         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
881         struct net *net = sock_net(skb->sk);
882         struct tipc_net *tn = net_generic(net, tipc_net_id);
883         u32 domain;
884         u32 prio;
885 
886         prio = TIPC_MEDIA_LINK_PRI;
887         domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK;
888 
889         if (!info->attrs[TIPC_NLA_BEARER])
890                 return -EINVAL;
891 
892         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
893                                info->attrs[TIPC_NLA_BEARER],
894                                tipc_nl_bearer_policy);
895         if (err)
896                 return err;
897 
898         if (!attrs[TIPC_NLA_BEARER_NAME])
899                 return -EINVAL;
900 
901         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
902 
903         if (attrs[TIPC_NLA_BEARER_DOMAIN])
904                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
905 
906         if (attrs[TIPC_NLA_BEARER_PROP]) {
907                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
908 
909                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
910                                               props);
911                 if (err)
912                         return err;
913 
914                 if (props[TIPC_NLA_PROP_PRIO])
915                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
916         }
917 
918         rtnl_lock();
919         err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
920         if (err) {
921                 rtnl_unlock();
922                 return err;
923         }
924         rtnl_unlock();
925 
926         return 0;
927 }
928 
929 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
930 {
931         int err;
932         char *name;
933         struct tipc_bearer *b;
934         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
935         struct net *net = sock_net(skb->sk);
936 
937         if (!info->attrs[TIPC_NLA_BEARER])
938                 return -EINVAL;
939 
940         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
941                                info->attrs[TIPC_NLA_BEARER],
942                                tipc_nl_bearer_policy);
943         if (err)
944                 return err;
945 
946         if (!attrs[TIPC_NLA_BEARER_NAME])
947                 return -EINVAL;
948         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
949 
950         rtnl_lock();
951         b = tipc_bearer_find(net, name);
952         if (!b) {
953                 rtnl_unlock();
954                 return -EINVAL;
955         }
956 
957 #ifdef CONFIG_TIPC_MEDIA_UDP
958         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
959                 err = tipc_udp_nl_bearer_add(b,
960                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
961                 if (err) {
962                         rtnl_unlock();
963                         return err;
964                 }
965         }
966 #endif
967         rtnl_unlock();
968 
969         return 0;
970 }
971 
972 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
973 {
974         int err;
975         char *name;
976         struct tipc_bearer *b;
977         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
978         struct net *net = sock_net(skb->sk);
979 
980         if (!info->attrs[TIPC_NLA_BEARER])
981                 return -EINVAL;
982 
983         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
984                                info->attrs[TIPC_NLA_BEARER],
985                                tipc_nl_bearer_policy);
986         if (err)
987                 return err;
988 
989         if (!attrs[TIPC_NLA_BEARER_NAME])
990                 return -EINVAL;
991         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
992 
993         rtnl_lock();
994         b = tipc_bearer_find(net, name);
995         if (!b) {
996                 rtnl_unlock();
997                 return -EINVAL;
998         }
999 
1000         if (attrs[TIPC_NLA_BEARER_PROP]) {
1001                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1002 
1003                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1004                                               props);
1005                 if (err) {
1006                         rtnl_unlock();
1007                         return err;
1008                 }
1009 
1010                 if (props[TIPC_NLA_PROP_TOL])
1011                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1012                 if (props[TIPC_NLA_PROP_PRIO])
1013                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1014                 if (props[TIPC_NLA_PROP_WIN])
1015                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1016         }
1017         rtnl_unlock();
1018 
1019         return 0;
1020 }
1021 
1022 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1023                                struct tipc_media *media, int nlflags)
1024 {
1025         void *hdr;
1026         struct nlattr *attrs;
1027         struct nlattr *prop;
1028 
1029         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1030                           nlflags, TIPC_NL_MEDIA_GET);
1031         if (!hdr)
1032                 return -EMSGSIZE;
1033 
1034         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1035         if (!attrs)
1036                 goto msg_full;
1037 
1038         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1039                 goto attr_msg_full;
1040 
1041         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1042         if (!prop)
1043                 goto prop_msg_full;
1044         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1045                 goto prop_msg_full;
1046         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1047                 goto prop_msg_full;
1048         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1049                 goto prop_msg_full;
1050 
1051         nla_nest_end(msg->skb, prop);
1052         nla_nest_end(msg->skb, attrs);
1053         genlmsg_end(msg->skb, hdr);
1054 
1055         return 0;
1056 
1057 prop_msg_full:
1058         nla_nest_cancel(msg->skb, prop);
1059 attr_msg_full:
1060         nla_nest_cancel(msg->skb, attrs);
1061 msg_full:
1062         genlmsg_cancel(msg->skb, hdr);
1063 
1064         return -EMSGSIZE;
1065 }
1066 
1067 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1068 {
1069         int err;
1070         int i = cb->args[0];
1071         struct tipc_nl_msg msg;
1072 
1073         if (i == MAX_MEDIA)
1074                 return 0;
1075 
1076         msg.skb = skb;
1077         msg.portid = NETLINK_CB(cb->skb).portid;
1078         msg.seq = cb->nlh->nlmsg_seq;
1079 
1080         rtnl_lock();
1081         for (; media_info_array[i] != NULL; i++) {
1082                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1083                                           NLM_F_MULTI);
1084                 if (err)
1085                         break;
1086         }
1087         rtnl_unlock();
1088 
1089         cb->args[0] = i;
1090         return skb->len;
1091 }
1092 
1093 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1094 {
1095         int err;
1096         char *name;
1097         struct tipc_nl_msg msg;
1098         struct tipc_media *media;
1099         struct sk_buff *rep;
1100         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1101 
1102         if (!info->attrs[TIPC_NLA_MEDIA])
1103                 return -EINVAL;
1104 
1105         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1106                                info->attrs[TIPC_NLA_MEDIA],
1107                                tipc_nl_media_policy);
1108         if (err)
1109                 return err;
1110 
1111         if (!attrs[TIPC_NLA_MEDIA_NAME])
1112                 return -EINVAL;
1113         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1114 
1115         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1116         if (!rep)
1117                 return -ENOMEM;
1118 
1119         msg.skb = rep;
1120         msg.portid = info->snd_portid;
1121         msg.seq = info->snd_seq;
1122 
1123         rtnl_lock();
1124         media = tipc_media_find(name);
1125         if (!media) {
1126                 err = -EINVAL;
1127                 goto err_out;
1128         }
1129 
1130         err = __tipc_nl_add_media(&msg, media, 0);
1131         if (err)
1132                 goto err_out;
1133         rtnl_unlock();
1134 
1135         return genlmsg_reply(rep, info);
1136 err_out:
1137         rtnl_unlock();
1138         nlmsg_free(rep);
1139 
1140         return err;
1141 }
1142 
1143 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1144 {
1145         int err;
1146         char *name;
1147         struct tipc_media *m;
1148         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1149 
1150         if (!info->attrs[TIPC_NLA_MEDIA])
1151                 return -EINVAL;
1152 
1153         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1154                                info->attrs[TIPC_NLA_MEDIA],
1155                                tipc_nl_media_policy);
1156 
1157         if (!attrs[TIPC_NLA_MEDIA_NAME])
1158                 return -EINVAL;
1159         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1160 
1161         rtnl_lock();
1162         m = tipc_media_find(name);
1163         if (!m) {
1164                 rtnl_unlock();
1165                 return -EINVAL;
1166         }
1167 
1168         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1169                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1170 
1171                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1172                                               props);
1173                 if (err) {
1174                         rtnl_unlock();
1175                         return err;
1176                 }
1177 
1178                 if (props[TIPC_NLA_PROP_TOL])
1179                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1180                 if (props[TIPC_NLA_PROP_PRIO])
1181                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1182                 if (props[TIPC_NLA_PROP_WIN])
1183                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1184         }
1185         rtnl_unlock();
1186 
1187         return 0;
1188 }
1189 

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