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

Version: ~ [ linux-4.17-rc6 ] ~ [ linux-4.16.10 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.42 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.101 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.132 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.51 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.109 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.56 ] ~ [ 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-3.2.101 ] ~ [ 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-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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->disc);
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->disc);
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 prio,
234                               struct nlattr *attr[])
235 {
236         struct tipc_net *tn = tipc_net(net);
237         struct tipc_bearer_names b_names;
238         int with_this_prio = 1;
239         struct tipc_bearer *b;
240         struct tipc_media *m;
241         struct sk_buff *skb;
242         int bearer_id = 0;
243         int res = -EINVAL;
244         char *errstr = "";
245 
246         if (!bearer_name_validate(name, &b_names)) {
247                 errstr = "illegal name";
248                 goto rejected;
249         }
250 
251         if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
252                 errstr = "illegal priority";
253                 goto rejected;
254         }
255 
256         m = tipc_media_find(b_names.media_name);
257         if (!m) {
258                 errstr = "media not registered";
259                 goto rejected;
260         }
261 
262         if (prio == TIPC_MEDIA_LINK_PRI)
263                 prio = m->priority;
264 
265         /* Check new bearer vs existing ones and find free bearer id if any */
266         while (bearer_id < MAX_BEARERS) {
267                 b = rtnl_dereference(tn->bearer_list[bearer_id]);
268                 if (!b)
269                         break;
270                 if (!strcmp(name, b->name)) {
271                         errstr = "already enabled";
272                         goto rejected;
273                 }
274                 bearer_id++;
275                 if (b->priority != prio)
276                         continue;
277                 if (++with_this_prio <= 2)
278                         continue;
279                 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
280                         name, prio);
281                 if (prio == TIPC_MIN_LINK_PRI) {
282                         errstr = "cannot adjust to lower";
283                         goto rejected;
284                 }
285                 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
286                 prio--;
287                 bearer_id = 0;
288                 with_this_prio = 1;
289         }
290 
291         if (bearer_id >= MAX_BEARERS) {
292                 errstr = "max 3 bearers permitted";
293                 goto rejected;
294         }
295 
296         b = kzalloc(sizeof(*b), GFP_ATOMIC);
297         if (!b)
298                 return -ENOMEM;
299 
300         strcpy(b->name, name);
301         b->media = m;
302         res = m->enable_media(net, b, attr);
303         if (res) {
304                 kfree(b);
305                 errstr = "failed to enable media";
306                 goto rejected;
307         }
308 
309         b->identity = bearer_id;
310         b->tolerance = m->tolerance;
311         b->window = m->window;
312         b->domain = disc_domain;
313         b->net_plane = bearer_id + 'A';
314         b->priority = prio;
315         test_and_set_bit_lock(0, &b->up);
316 
317         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
318         if (res) {
319                 bearer_disable(net, b);
320                 kfree(b);
321                 errstr = "failed to create discoverer";
322                 goto rejected;
323         }
324 
325         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
326         if (skb)
327                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
328 
329         if (tipc_mon_create(net, bearer_id)) {
330                 bearer_disable(net, b);
331                 return -ENOMEM;
332         }
333 
334         pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
335 
336         return res;
337 rejected:
338         pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
339         return res;
340 }
341 
342 /**
343  * tipc_reset_bearer - Reset all links established over this bearer
344  */
345 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
346 {
347         pr_info("Resetting bearer <%s>\n", b->name);
348         tipc_node_delete_links(net, b->identity);
349         tipc_disc_reset(net, b);
350         return 0;
351 }
352 
353 /**
354  * bearer_disable
355  *
356  * Note: This routine assumes caller holds RTNL lock.
357  */
358 static void bearer_disable(struct net *net, struct tipc_bearer *b)
359 {
360         struct tipc_net *tn = tipc_net(net);
361         int bearer_id = b->identity;
362 
363         pr_info("Disabling bearer <%s>\n", b->name);
364         clear_bit_unlock(0, &b->up);
365         tipc_node_delete_links(net, bearer_id);
366         b->media->disable_media(b);
367         RCU_INIT_POINTER(b->media_ptr, NULL);
368         if (b->disc)
369                 tipc_disc_delete(b->disc);
370         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
371         kfree_rcu(b, rcu);
372         tipc_mon_delete(net, bearer_id);
373 }
374 
375 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
376                          struct nlattr *attr[])
377 {
378         char *dev_name = strchr((const char *)b->name, ':') + 1;
379         int hwaddr_len = b->media->hwaddr_len;
380         u8 node_id[NODE_ID_LEN] = {0,};
381         struct net_device *dev;
382 
383         /* Find device with specified name */
384         dev = dev_get_by_name(net, dev_name);
385         if (!dev)
386                 return -ENODEV;
387         if (tipc_mtu_bad(dev, 0)) {
388                 dev_put(dev);
389                 return -EINVAL;
390         }
391 
392         /* Autoconfigure own node identity if needed */
393         if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
394                 memcpy(node_id, dev->dev_addr, hwaddr_len);
395                 tipc_net_init(net, node_id, 0);
396         }
397         if (!tipc_own_id(net)) {
398                 pr_warn("Failed to obtain node identity\n");
399                 return -EINVAL;
400         }
401 
402         /* Associate TIPC bearer with L2 bearer */
403         rcu_assign_pointer(b->media_ptr, dev);
404         b->pt.dev = dev;
405         b->pt.type = htons(ETH_P_TIPC);
406         b->pt.func = tipc_l2_rcv_msg;
407         dev_add_pack(&b->pt);
408         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
409         memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
410         b->bcast_addr.media_id = b->media->type_id;
411         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
412         b->mtu = dev->mtu;
413         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
414         rcu_assign_pointer(dev->tipc_ptr, b);
415         return 0;
416 }
417 
418 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
419  *
420  * Mark L2 bearer as inactive so that incoming buffers are thrown away
421  */
422 void tipc_disable_l2_media(struct tipc_bearer *b)
423 {
424         struct net_device *dev;
425 
426         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
427         dev_remove_pack(&b->pt);
428         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
429         synchronize_net();
430         dev_put(dev);
431 }
432 
433 /**
434  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
435  * @skb: the packet to be sent
436  * @b: the bearer through which the packet is to be sent
437  * @dest: peer destination address
438  */
439 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
440                      struct tipc_bearer *b, struct tipc_media_addr *dest)
441 {
442         struct net_device *dev;
443         int delta;
444 
445         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
446         if (!dev)
447                 return 0;
448 
449         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
450         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
451                 kfree_skb(skb);
452                 return 0;
453         }
454         skb_reset_network_header(skb);
455         skb->dev = dev;
456         skb->protocol = htons(ETH_P_TIPC);
457         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
458                         dev->dev_addr, skb->len);
459         dev_queue_xmit(skb);
460         return 0;
461 }
462 
463 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
464 {
465         bool supp = false;
466         struct tipc_bearer *b;
467 
468         rcu_read_lock();
469         b = bearer_get(net, bearer_id);
470         if (b)
471                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
472         rcu_read_unlock();
473         return supp;
474 }
475 
476 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
477 {
478         int mtu = 0;
479         struct tipc_bearer *b;
480 
481         rcu_read_lock();
482         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
483         if (b)
484                 mtu = b->mtu;
485         rcu_read_unlock();
486         return mtu;
487 }
488 
489 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
490  */
491 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
492                           struct sk_buff *skb,
493                           struct tipc_media_addr *dest)
494 {
495         struct tipc_msg *hdr = buf_msg(skb);
496         struct tipc_bearer *b;
497 
498         rcu_read_lock();
499         b = bearer_get(net, bearer_id);
500         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
501                 b->media->send_msg(net, skb, b, dest);
502         else
503                 kfree_skb(skb);
504         rcu_read_unlock();
505 }
506 
507 /* tipc_bearer_xmit() -send buffer to destination over bearer
508  */
509 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
510                       struct sk_buff_head *xmitq,
511                       struct tipc_media_addr *dst)
512 {
513         struct tipc_bearer *b;
514         struct sk_buff *skb, *tmp;
515 
516         if (skb_queue_empty(xmitq))
517                 return;
518 
519         rcu_read_lock();
520         b = bearer_get(net, bearer_id);
521         if (unlikely(!b))
522                 __skb_queue_purge(xmitq);
523         skb_queue_walk_safe(xmitq, skb, tmp) {
524                 __skb_dequeue(xmitq);
525                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
526                         b->media->send_msg(net, skb, b, dst);
527                 else
528                         kfree_skb(skb);
529         }
530         rcu_read_unlock();
531 }
532 
533 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
534  */
535 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
536                          struct sk_buff_head *xmitq)
537 {
538         struct tipc_net *tn = tipc_net(net);
539         int net_id = tn->net_id;
540         struct tipc_bearer *b;
541         struct sk_buff *skb, *tmp;
542         struct tipc_msg *hdr;
543 
544         rcu_read_lock();
545         b = bearer_get(net, bearer_id);
546         if (unlikely(!b || !test_bit(0, &b->up)))
547                 __skb_queue_purge(xmitq);
548         skb_queue_walk_safe(xmitq, skb, tmp) {
549                 hdr = buf_msg(skb);
550                 msg_set_non_seq(hdr, 1);
551                 msg_set_mc_netid(hdr, net_id);
552                 __skb_dequeue(xmitq);
553                 b->media->send_msg(net, skb, b, &b->bcast_addr);
554         }
555         rcu_read_unlock();
556 }
557 
558 /**
559  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
560  * @buf: the received packet
561  * @dev: the net device that the packet was received on
562  * @pt: the packet_type structure which was used to register this handler
563  * @orig_dev: the original receive net device in case the device is a bond
564  *
565  * Accept only packets explicitly sent to this node, or broadcast packets;
566  * ignores packets sent using interface multicast, and traffic sent to other
567  * nodes (which can happen if interface is running in promiscuous mode).
568  */
569 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
570                            struct packet_type *pt, struct net_device *orig_dev)
571 {
572         struct tipc_bearer *b;
573 
574         rcu_read_lock();
575         b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
576                 rcu_dereference_rtnl(orig_dev->tipc_ptr);
577         if (likely(b && test_bit(0, &b->up) &&
578                    (skb->pkt_type <= PACKET_MULTICAST))) {
579                 skb->next = NULL;
580                 tipc_rcv(dev_net(b->pt.dev), skb, b);
581                 rcu_read_unlock();
582                 return NET_RX_SUCCESS;
583         }
584         rcu_read_unlock();
585         kfree_skb(skb);
586         return NET_RX_DROP;
587 }
588 
589 /**
590  * tipc_l2_device_event - handle device events from network device
591  * @nb: the context of the notification
592  * @evt: the type of event
593  * @ptr: the net device that the event was on
594  *
595  * This function is called by the Ethernet driver in case of link
596  * change event.
597  */
598 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
599                                 void *ptr)
600 {
601         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
602         struct net *net = dev_net(dev);
603         struct tipc_bearer *b;
604 
605         b = rtnl_dereference(dev->tipc_ptr);
606         if (!b)
607                 return NOTIFY_DONE;
608 
609         switch (evt) {
610         case NETDEV_CHANGE:
611                 if (netif_carrier_ok(dev))
612                         break;
613         case NETDEV_UP:
614                 test_and_set_bit_lock(0, &b->up);
615                 break;
616         case NETDEV_GOING_DOWN:
617                 clear_bit_unlock(0, &b->up);
618                 tipc_reset_bearer(net, b);
619                 break;
620         case NETDEV_CHANGEMTU:
621                 if (tipc_mtu_bad(dev, 0)) {
622                         bearer_disable(net, b);
623                         break;
624                 }
625                 b->mtu = dev->mtu;
626                 tipc_reset_bearer(net, b);
627                 break;
628         case NETDEV_CHANGEADDR:
629                 b->media->raw2addr(b, &b->addr,
630                                    (char *)dev->dev_addr);
631                 tipc_reset_bearer(net, b);
632                 break;
633         case NETDEV_UNREGISTER:
634         case NETDEV_CHANGENAME:
635                 bearer_disable(net, b);
636                 break;
637         }
638         return NOTIFY_OK;
639 }
640 
641 static struct notifier_block notifier = {
642         .notifier_call  = tipc_l2_device_event,
643         .priority       = 0,
644 };
645 
646 int tipc_bearer_setup(void)
647 {
648         return register_netdevice_notifier(&notifier);
649 }
650 
651 void tipc_bearer_cleanup(void)
652 {
653         unregister_netdevice_notifier(&notifier);
654 }
655 
656 void tipc_bearer_stop(struct net *net)
657 {
658         struct tipc_net *tn = net_generic(net, tipc_net_id);
659         struct tipc_bearer *b;
660         u32 i;
661 
662         for (i = 0; i < MAX_BEARERS; i++) {
663                 b = rtnl_dereference(tn->bearer_list[i]);
664                 if (b) {
665                         bearer_disable(net, b);
666                         tn->bearer_list[i] = NULL;
667                 }
668         }
669 }
670 
671 /* Caller should hold rtnl_lock to protect the bearer */
672 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
673                                 struct tipc_bearer *bearer, int nlflags)
674 {
675         void *hdr;
676         struct nlattr *attrs;
677         struct nlattr *prop;
678 
679         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
680                           nlflags, TIPC_NL_BEARER_GET);
681         if (!hdr)
682                 return -EMSGSIZE;
683 
684         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
685         if (!attrs)
686                 goto msg_full;
687 
688         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
689                 goto attr_msg_full;
690 
691         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
692         if (!prop)
693                 goto prop_msg_full;
694         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
695                 goto prop_msg_full;
696         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
697                 goto prop_msg_full;
698         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
699                 goto prop_msg_full;
700 
701         nla_nest_end(msg->skb, prop);
702 
703 #ifdef CONFIG_TIPC_MEDIA_UDP
704         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
705                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
706                         goto attr_msg_full;
707         }
708 #endif
709 
710         nla_nest_end(msg->skb, attrs);
711         genlmsg_end(msg->skb, hdr);
712 
713         return 0;
714 
715 prop_msg_full:
716         nla_nest_cancel(msg->skb, prop);
717 attr_msg_full:
718         nla_nest_cancel(msg->skb, attrs);
719 msg_full:
720         genlmsg_cancel(msg->skb, hdr);
721 
722         return -EMSGSIZE;
723 }
724 
725 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
726 {
727         int err;
728         int i = cb->args[0];
729         struct tipc_bearer *bearer;
730         struct tipc_nl_msg msg;
731         struct net *net = sock_net(skb->sk);
732         struct tipc_net *tn = net_generic(net, tipc_net_id);
733 
734         if (i == MAX_BEARERS)
735                 return 0;
736 
737         msg.skb = skb;
738         msg.portid = NETLINK_CB(cb->skb).portid;
739         msg.seq = cb->nlh->nlmsg_seq;
740 
741         rtnl_lock();
742         for (i = 0; i < MAX_BEARERS; i++) {
743                 bearer = rtnl_dereference(tn->bearer_list[i]);
744                 if (!bearer)
745                         continue;
746 
747                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
748                 if (err)
749                         break;
750         }
751         rtnl_unlock();
752 
753         cb->args[0] = i;
754         return skb->len;
755 }
756 
757 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
758 {
759         int err;
760         char *name;
761         struct sk_buff *rep;
762         struct tipc_bearer *bearer;
763         struct tipc_nl_msg msg;
764         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
765         struct net *net = genl_info_net(info);
766 
767         if (!info->attrs[TIPC_NLA_BEARER])
768                 return -EINVAL;
769 
770         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
771                                info->attrs[TIPC_NLA_BEARER],
772                                tipc_nl_bearer_policy, info->extack);
773         if (err)
774                 return err;
775 
776         if (!attrs[TIPC_NLA_BEARER_NAME])
777                 return -EINVAL;
778         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
779 
780         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
781         if (!rep)
782                 return -ENOMEM;
783 
784         msg.skb = rep;
785         msg.portid = info->snd_portid;
786         msg.seq = info->snd_seq;
787 
788         rtnl_lock();
789         bearer = tipc_bearer_find(net, name);
790         if (!bearer) {
791                 err = -EINVAL;
792                 goto err_out;
793         }
794 
795         err = __tipc_nl_add_bearer(&msg, bearer, 0);
796         if (err)
797                 goto err_out;
798         rtnl_unlock();
799 
800         return genlmsg_reply(rep, info);
801 err_out:
802         rtnl_unlock();
803         nlmsg_free(rep);
804 
805         return err;
806 }
807 
808 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
809 {
810         int err;
811         char *name;
812         struct tipc_bearer *bearer;
813         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
814         struct net *net = sock_net(skb->sk);
815 
816         if (!info->attrs[TIPC_NLA_BEARER])
817                 return -EINVAL;
818 
819         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
820                                info->attrs[TIPC_NLA_BEARER],
821                                tipc_nl_bearer_policy, info->extack);
822         if (err)
823                 return err;
824 
825         if (!attrs[TIPC_NLA_BEARER_NAME])
826                 return -EINVAL;
827 
828         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
829 
830         bearer = tipc_bearer_find(net, name);
831         if (!bearer)
832                 return -EINVAL;
833 
834         bearer_disable(net, bearer);
835 
836         return 0;
837 }
838 
839 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
840 {
841         int err;
842 
843         rtnl_lock();
844         err = __tipc_nl_bearer_disable(skb, info);
845         rtnl_unlock();
846 
847         return err;
848 }
849 
850 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
851 {
852         int err;
853         char *bearer;
854         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
855         struct net *net = sock_net(skb->sk);
856         u32 domain = 0;
857         u32 prio;
858 
859         prio = TIPC_MEDIA_LINK_PRI;
860 
861         if (!info->attrs[TIPC_NLA_BEARER])
862                 return -EINVAL;
863 
864         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
865                                info->attrs[TIPC_NLA_BEARER],
866                                tipc_nl_bearer_policy, info->extack);
867         if (err)
868                 return err;
869 
870         if (!attrs[TIPC_NLA_BEARER_NAME])
871                 return -EINVAL;
872 
873         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
874 
875         if (attrs[TIPC_NLA_BEARER_DOMAIN])
876                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
877 
878         if (attrs[TIPC_NLA_BEARER_PROP]) {
879                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
880 
881                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
882                                               props);
883                 if (err)
884                         return err;
885 
886                 if (props[TIPC_NLA_PROP_PRIO])
887                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
888         }
889 
890         return tipc_enable_bearer(net, bearer, domain, prio, attrs);
891 }
892 
893 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
894 {
895         int err;
896 
897         rtnl_lock();
898         err = __tipc_nl_bearer_enable(skb, info);
899         rtnl_unlock();
900 
901         return err;
902 }
903 
904 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
905 {
906         int err;
907         char *name;
908         struct tipc_bearer *b;
909         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
910         struct net *net = sock_net(skb->sk);
911 
912         if (!info->attrs[TIPC_NLA_BEARER])
913                 return -EINVAL;
914 
915         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
916                                info->attrs[TIPC_NLA_BEARER],
917                                tipc_nl_bearer_policy, info->extack);
918         if (err)
919                 return err;
920 
921         if (!attrs[TIPC_NLA_BEARER_NAME])
922                 return -EINVAL;
923         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
924 
925         rtnl_lock();
926         b = tipc_bearer_find(net, name);
927         if (!b) {
928                 rtnl_unlock();
929                 return -EINVAL;
930         }
931 
932 #ifdef CONFIG_TIPC_MEDIA_UDP
933         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
934                 err = tipc_udp_nl_bearer_add(b,
935                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
936                 if (err) {
937                         rtnl_unlock();
938                         return err;
939                 }
940         }
941 #endif
942         rtnl_unlock();
943 
944         return 0;
945 }
946 
947 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
948 {
949         struct tipc_bearer *b;
950         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
951         struct net *net = sock_net(skb->sk);
952         char *name;
953         int err;
954 
955         if (!info->attrs[TIPC_NLA_BEARER])
956                 return -EINVAL;
957 
958         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
959                                info->attrs[TIPC_NLA_BEARER],
960                                tipc_nl_bearer_policy, info->extack);
961         if (err)
962                 return err;
963 
964         if (!attrs[TIPC_NLA_BEARER_NAME])
965                 return -EINVAL;
966         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
967 
968         b = tipc_bearer_find(net, name);
969         if (!b)
970                 return -EINVAL;
971 
972         if (attrs[TIPC_NLA_BEARER_PROP]) {
973                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
974 
975                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
976                                               props);
977                 if (err)
978                         return err;
979 
980                 if (props[TIPC_NLA_PROP_TOL]) {
981                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
982                         tipc_node_apply_tolerance(net, b);
983                 }
984                 if (props[TIPC_NLA_PROP_PRIO])
985                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
986                 if (props[TIPC_NLA_PROP_WIN])
987                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
988         }
989 
990         return 0;
991 }
992 
993 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
994 {
995         int err;
996 
997         rtnl_lock();
998         err = __tipc_nl_bearer_set(skb, info);
999         rtnl_unlock();
1000 
1001         return err;
1002 }
1003 
1004 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1005                                struct tipc_media *media, int nlflags)
1006 {
1007         void *hdr;
1008         struct nlattr *attrs;
1009         struct nlattr *prop;
1010 
1011         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1012                           nlflags, TIPC_NL_MEDIA_GET);
1013         if (!hdr)
1014                 return -EMSGSIZE;
1015 
1016         attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
1017         if (!attrs)
1018                 goto msg_full;
1019 
1020         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1021                 goto attr_msg_full;
1022 
1023         prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
1024         if (!prop)
1025                 goto prop_msg_full;
1026         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1027                 goto prop_msg_full;
1028         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1029                 goto prop_msg_full;
1030         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1031                 goto prop_msg_full;
1032 
1033         nla_nest_end(msg->skb, prop);
1034         nla_nest_end(msg->skb, attrs);
1035         genlmsg_end(msg->skb, hdr);
1036 
1037         return 0;
1038 
1039 prop_msg_full:
1040         nla_nest_cancel(msg->skb, prop);
1041 attr_msg_full:
1042         nla_nest_cancel(msg->skb, attrs);
1043 msg_full:
1044         genlmsg_cancel(msg->skb, hdr);
1045 
1046         return -EMSGSIZE;
1047 }
1048 
1049 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1050 {
1051         int err;
1052         int i = cb->args[0];
1053         struct tipc_nl_msg msg;
1054 
1055         if (i == MAX_MEDIA)
1056                 return 0;
1057 
1058         msg.skb = skb;
1059         msg.portid = NETLINK_CB(cb->skb).portid;
1060         msg.seq = cb->nlh->nlmsg_seq;
1061 
1062         rtnl_lock();
1063         for (; media_info_array[i] != NULL; i++) {
1064                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1065                                           NLM_F_MULTI);
1066                 if (err)
1067                         break;
1068         }
1069         rtnl_unlock();
1070 
1071         cb->args[0] = i;
1072         return skb->len;
1073 }
1074 
1075 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1076 {
1077         int err;
1078         char *name;
1079         struct tipc_nl_msg msg;
1080         struct tipc_media *media;
1081         struct sk_buff *rep;
1082         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1083 
1084         if (!info->attrs[TIPC_NLA_MEDIA])
1085                 return -EINVAL;
1086 
1087         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1088                                info->attrs[TIPC_NLA_MEDIA],
1089                                tipc_nl_media_policy, info->extack);
1090         if (err)
1091                 return err;
1092 
1093         if (!attrs[TIPC_NLA_MEDIA_NAME])
1094                 return -EINVAL;
1095         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1096 
1097         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1098         if (!rep)
1099                 return -ENOMEM;
1100 
1101         msg.skb = rep;
1102         msg.portid = info->snd_portid;
1103         msg.seq = info->snd_seq;
1104 
1105         rtnl_lock();
1106         media = tipc_media_find(name);
1107         if (!media) {
1108                 err = -EINVAL;
1109                 goto err_out;
1110         }
1111 
1112         err = __tipc_nl_add_media(&msg, media, 0);
1113         if (err)
1114                 goto err_out;
1115         rtnl_unlock();
1116 
1117         return genlmsg_reply(rep, info);
1118 err_out:
1119         rtnl_unlock();
1120         nlmsg_free(rep);
1121 
1122         return err;
1123 }
1124 
1125 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1126 {
1127         int err;
1128         char *name;
1129         struct tipc_media *m;
1130         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1131 
1132         if (!info->attrs[TIPC_NLA_MEDIA])
1133                 return -EINVAL;
1134 
1135         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1136                                info->attrs[TIPC_NLA_MEDIA],
1137                                tipc_nl_media_policy, info->extack);
1138 
1139         if (!attrs[TIPC_NLA_MEDIA_NAME])
1140                 return -EINVAL;
1141         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1142 
1143         m = tipc_media_find(name);
1144         if (!m)
1145                 return -EINVAL;
1146 
1147         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1148                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1149 
1150                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1151                                               props);
1152                 if (err)
1153                         return err;
1154 
1155                 if (props[TIPC_NLA_PROP_TOL])
1156                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1157                 if (props[TIPC_NLA_PROP_PRIO])
1158                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1159                 if (props[TIPC_NLA_PROP_WIN])
1160                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1161         }
1162 
1163         return 0;
1164 }
1165 
1166 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1167 {
1168         int err;
1169 
1170         rtnl_lock();
1171         err = __tipc_nl_media_set(skb, info);
1172         rtnl_unlock();
1173 
1174         return err;
1175 }
1176 

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