~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-4.20-rc5 ] ~ [ linux-4.19.6 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.85 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.142 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.166 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.128 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.61 ] ~ [ 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-2.6.31.14 ] ~ [ linux-2.6.30.10 ] ~ [ linux-2.6.29.6 ] ~ [ linux-2.6.28.10 ] ~ [ 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                 dev_put(dev);
399                 pr_warn("Failed to obtain node identity\n");
400                 return -EINVAL;
401         }
402 
403         /* Associate TIPC bearer with L2 bearer */
404         rcu_assign_pointer(b->media_ptr, dev);
405         b->pt.dev = dev;
406         b->pt.type = htons(ETH_P_TIPC);
407         b->pt.func = tipc_l2_rcv_msg;
408         dev_add_pack(&b->pt);
409         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
410         memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
411         b->bcast_addr.media_id = b->media->type_id;
412         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
413         b->mtu = dev->mtu;
414         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
415         rcu_assign_pointer(dev->tipc_ptr, b);
416         return 0;
417 }
418 
419 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
420  *
421  * Mark L2 bearer as inactive so that incoming buffers are thrown away
422  */
423 void tipc_disable_l2_media(struct tipc_bearer *b)
424 {
425         struct net_device *dev;
426 
427         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
428         dev_remove_pack(&b->pt);
429         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
430         synchronize_net();
431         dev_put(dev);
432 }
433 
434 /**
435  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
436  * @skb: the packet to be sent
437  * @b: the bearer through which the packet is to be sent
438  * @dest: peer destination address
439  */
440 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
441                      struct tipc_bearer *b, struct tipc_media_addr *dest)
442 {
443         struct net_device *dev;
444         int delta;
445 
446         dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
447         if (!dev)
448                 return 0;
449 
450         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
451         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
452                 kfree_skb(skb);
453                 return 0;
454         }
455         skb_reset_network_header(skb);
456         skb->dev = dev;
457         skb->protocol = htons(ETH_P_TIPC);
458         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
459                         dev->dev_addr, skb->len);
460         dev_queue_xmit(skb);
461         return 0;
462 }
463 
464 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
465 {
466         bool supp = false;
467         struct tipc_bearer *b;
468 
469         rcu_read_lock();
470         b = bearer_get(net, bearer_id);
471         if (b)
472                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
473         rcu_read_unlock();
474         return supp;
475 }
476 
477 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
478 {
479         int mtu = 0;
480         struct tipc_bearer *b;
481 
482         rcu_read_lock();
483         b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
484         if (b)
485                 mtu = b->mtu;
486         rcu_read_unlock();
487         return mtu;
488 }
489 
490 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
491  */
492 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
493                           struct sk_buff *skb,
494                           struct tipc_media_addr *dest)
495 {
496         struct tipc_msg *hdr = buf_msg(skb);
497         struct tipc_bearer *b;
498 
499         rcu_read_lock();
500         b = bearer_get(net, bearer_id);
501         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
502                 b->media->send_msg(net, skb, b, dest);
503         else
504                 kfree_skb(skb);
505         rcu_read_unlock();
506 }
507 
508 /* tipc_bearer_xmit() -send buffer to destination over bearer
509  */
510 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
511                       struct sk_buff_head *xmitq,
512                       struct tipc_media_addr *dst)
513 {
514         struct tipc_bearer *b;
515         struct sk_buff *skb, *tmp;
516 
517         if (skb_queue_empty(xmitq))
518                 return;
519 
520         rcu_read_lock();
521         b = bearer_get(net, bearer_id);
522         if (unlikely(!b))
523                 __skb_queue_purge(xmitq);
524         skb_queue_walk_safe(xmitq, skb, tmp) {
525                 __skb_dequeue(xmitq);
526                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
527                         b->media->send_msg(net, skb, b, dst);
528                 else
529                         kfree_skb(skb);
530         }
531         rcu_read_unlock();
532 }
533 
534 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
535  */
536 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
537                          struct sk_buff_head *xmitq)
538 {
539         struct tipc_net *tn = tipc_net(net);
540         int net_id = tn->net_id;
541         struct tipc_bearer *b;
542         struct sk_buff *skb, *tmp;
543         struct tipc_msg *hdr;
544 
545         rcu_read_lock();
546         b = bearer_get(net, bearer_id);
547         if (unlikely(!b || !test_bit(0, &b->up)))
548                 __skb_queue_purge(xmitq);
549         skb_queue_walk_safe(xmitq, skb, tmp) {
550                 hdr = buf_msg(skb);
551                 msg_set_non_seq(hdr, 1);
552                 msg_set_mc_netid(hdr, net_id);
553                 __skb_dequeue(xmitq);
554                 b->media->send_msg(net, skb, b, &b->bcast_addr);
555         }
556         rcu_read_unlock();
557 }
558 
559 /**
560  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
561  * @buf: the received packet
562  * @dev: the net device that the packet was received on
563  * @pt: the packet_type structure which was used to register this handler
564  * @orig_dev: the original receive net device in case the device is a bond
565  *
566  * Accept only packets explicitly sent to this node, or broadcast packets;
567  * ignores packets sent using interface multicast, and traffic sent to other
568  * nodes (which can happen if interface is running in promiscuous mode).
569  */
570 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
571                            struct packet_type *pt, struct net_device *orig_dev)
572 {
573         struct tipc_bearer *b;
574 
575         rcu_read_lock();
576         b = rcu_dereference_rtnl(dev->tipc_ptr) ?:
577                 rcu_dereference_rtnl(orig_dev->tipc_ptr);
578         if (likely(b && test_bit(0, &b->up) &&
579                    (skb->pkt_type <= PACKET_MULTICAST))) {
580                 skb_mark_not_on_list(skb);
581                 tipc_rcv(dev_net(b->pt.dev), skb, b);
582                 rcu_read_unlock();
583                 return NET_RX_SUCCESS;
584         }
585         rcu_read_unlock();
586         kfree_skb(skb);
587         return NET_RX_DROP;
588 }
589 
590 /**
591  * tipc_l2_device_event - handle device events from network device
592  * @nb: the context of the notification
593  * @evt: the type of event
594  * @ptr: the net device that the event was on
595  *
596  * This function is called by the Ethernet driver in case of link
597  * change event.
598  */
599 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
600                                 void *ptr)
601 {
602         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
603         struct net *net = dev_net(dev);
604         struct tipc_bearer *b;
605 
606         b = rtnl_dereference(dev->tipc_ptr);
607         if (!b)
608                 return NOTIFY_DONE;
609 
610         switch (evt) {
611         case NETDEV_CHANGE:
612                 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
613                         test_and_set_bit_lock(0, &b->up);
614                         break;
615                 }
616                 /* fall through */
617         case NETDEV_GOING_DOWN:
618                 clear_bit_unlock(0, &b->up);
619                 tipc_reset_bearer(net, b);
620                 break;
621         case NETDEV_UP:
622                 test_and_set_bit_lock(0, &b->up);
623                 break;
624         case NETDEV_CHANGEMTU:
625                 if (tipc_mtu_bad(dev, 0)) {
626                         bearer_disable(net, b);
627                         break;
628                 }
629                 b->mtu = dev->mtu;
630                 tipc_reset_bearer(net, b);
631                 break;
632         case NETDEV_CHANGEADDR:
633                 b->media->raw2addr(b, &b->addr,
634                                    (char *)dev->dev_addr);
635                 tipc_reset_bearer(net, b);
636                 break;
637         case NETDEV_UNREGISTER:
638         case NETDEV_CHANGENAME:
639                 bearer_disable(net, b);
640                 break;
641         }
642         return NOTIFY_OK;
643 }
644 
645 static struct notifier_block notifier = {
646         .notifier_call  = tipc_l2_device_event,
647         .priority       = 0,
648 };
649 
650 int tipc_bearer_setup(void)
651 {
652         return register_netdevice_notifier(&notifier);
653 }
654 
655 void tipc_bearer_cleanup(void)
656 {
657         unregister_netdevice_notifier(&notifier);
658 }
659 
660 void tipc_bearer_stop(struct net *net)
661 {
662         struct tipc_net *tn = net_generic(net, tipc_net_id);
663         struct tipc_bearer *b;
664         u32 i;
665 
666         for (i = 0; i < MAX_BEARERS; i++) {
667                 b = rtnl_dereference(tn->bearer_list[i]);
668                 if (b) {
669                         bearer_disable(net, b);
670                         tn->bearer_list[i] = NULL;
671                 }
672         }
673 }
674 
675 /* Caller should hold rtnl_lock to protect the bearer */
676 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
677                                 struct tipc_bearer *bearer, int nlflags)
678 {
679         void *hdr;
680         struct nlattr *attrs;
681         struct nlattr *prop;
682 
683         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
684                           nlflags, TIPC_NL_BEARER_GET);
685         if (!hdr)
686                 return -EMSGSIZE;
687 
688         attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
689         if (!attrs)
690                 goto msg_full;
691 
692         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
693                 goto attr_msg_full;
694 
695         prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
696         if (!prop)
697                 goto prop_msg_full;
698         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
699                 goto prop_msg_full;
700         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
701                 goto prop_msg_full;
702         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
703                 goto prop_msg_full;
704         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
705                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
706                         goto prop_msg_full;
707 
708         nla_nest_end(msg->skb, prop);
709 
710 #ifdef CONFIG_TIPC_MEDIA_UDP
711         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
712                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
713                         goto attr_msg_full;
714         }
715 #endif
716 
717         nla_nest_end(msg->skb, attrs);
718         genlmsg_end(msg->skb, hdr);
719 
720         return 0;
721 
722 prop_msg_full:
723         nla_nest_cancel(msg->skb, prop);
724 attr_msg_full:
725         nla_nest_cancel(msg->skb, attrs);
726 msg_full:
727         genlmsg_cancel(msg->skb, hdr);
728 
729         return -EMSGSIZE;
730 }
731 
732 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
733 {
734         int err;
735         int i = cb->args[0];
736         struct tipc_bearer *bearer;
737         struct tipc_nl_msg msg;
738         struct net *net = sock_net(skb->sk);
739         struct tipc_net *tn = net_generic(net, tipc_net_id);
740 
741         if (i == MAX_BEARERS)
742                 return 0;
743 
744         msg.skb = skb;
745         msg.portid = NETLINK_CB(cb->skb).portid;
746         msg.seq = cb->nlh->nlmsg_seq;
747 
748         rtnl_lock();
749         for (i = 0; i < MAX_BEARERS; i++) {
750                 bearer = rtnl_dereference(tn->bearer_list[i]);
751                 if (!bearer)
752                         continue;
753 
754                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
755                 if (err)
756                         break;
757         }
758         rtnl_unlock();
759 
760         cb->args[0] = i;
761         return skb->len;
762 }
763 
764 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
765 {
766         int err;
767         char *name;
768         struct sk_buff *rep;
769         struct tipc_bearer *bearer;
770         struct tipc_nl_msg msg;
771         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
772         struct net *net = genl_info_net(info);
773 
774         if (!info->attrs[TIPC_NLA_BEARER])
775                 return -EINVAL;
776 
777         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
778                                info->attrs[TIPC_NLA_BEARER],
779                                tipc_nl_bearer_policy, info->extack);
780         if (err)
781                 return err;
782 
783         if (!attrs[TIPC_NLA_BEARER_NAME])
784                 return -EINVAL;
785         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
786 
787         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
788         if (!rep)
789                 return -ENOMEM;
790 
791         msg.skb = rep;
792         msg.portid = info->snd_portid;
793         msg.seq = info->snd_seq;
794 
795         rtnl_lock();
796         bearer = tipc_bearer_find(net, name);
797         if (!bearer) {
798                 err = -EINVAL;
799                 goto err_out;
800         }
801 
802         err = __tipc_nl_add_bearer(&msg, bearer, 0);
803         if (err)
804                 goto err_out;
805         rtnl_unlock();
806 
807         return genlmsg_reply(rep, info);
808 err_out:
809         rtnl_unlock();
810         nlmsg_free(rep);
811 
812         return err;
813 }
814 
815 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
816 {
817         int err;
818         char *name;
819         struct tipc_bearer *bearer;
820         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
821         struct net *net = sock_net(skb->sk);
822 
823         if (!info->attrs[TIPC_NLA_BEARER])
824                 return -EINVAL;
825 
826         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
827                                info->attrs[TIPC_NLA_BEARER],
828                                tipc_nl_bearer_policy, info->extack);
829         if (err)
830                 return err;
831 
832         if (!attrs[TIPC_NLA_BEARER_NAME])
833                 return -EINVAL;
834 
835         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
836 
837         bearer = tipc_bearer_find(net, name);
838         if (!bearer)
839                 return -EINVAL;
840 
841         bearer_disable(net, bearer);
842 
843         return 0;
844 }
845 
846 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
847 {
848         int err;
849 
850         rtnl_lock();
851         err = __tipc_nl_bearer_disable(skb, info);
852         rtnl_unlock();
853 
854         return err;
855 }
856 
857 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
858 {
859         int err;
860         char *bearer;
861         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
862         struct net *net = sock_net(skb->sk);
863         u32 domain = 0;
864         u32 prio;
865 
866         prio = TIPC_MEDIA_LINK_PRI;
867 
868         if (!info->attrs[TIPC_NLA_BEARER])
869                 return -EINVAL;
870 
871         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
872                                info->attrs[TIPC_NLA_BEARER],
873                                tipc_nl_bearer_policy, info->extack);
874         if (err)
875                 return err;
876 
877         if (!attrs[TIPC_NLA_BEARER_NAME])
878                 return -EINVAL;
879 
880         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
881 
882         if (attrs[TIPC_NLA_BEARER_DOMAIN])
883                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
884 
885         if (attrs[TIPC_NLA_BEARER_PROP]) {
886                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
887 
888                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
889                                               props);
890                 if (err)
891                         return err;
892 
893                 if (props[TIPC_NLA_PROP_PRIO])
894                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
895         }
896 
897         return tipc_enable_bearer(net, bearer, domain, prio, attrs);
898 }
899 
900 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
901 {
902         int err;
903 
904         rtnl_lock();
905         err = __tipc_nl_bearer_enable(skb, info);
906         rtnl_unlock();
907 
908         return err;
909 }
910 
911 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
912 {
913         int err;
914         char *name;
915         struct tipc_bearer *b;
916         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
917         struct net *net = sock_net(skb->sk);
918 
919         if (!info->attrs[TIPC_NLA_BEARER])
920                 return -EINVAL;
921 
922         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
923                                info->attrs[TIPC_NLA_BEARER],
924                                tipc_nl_bearer_policy, info->extack);
925         if (err)
926                 return err;
927 
928         if (!attrs[TIPC_NLA_BEARER_NAME])
929                 return -EINVAL;
930         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
931 
932         rtnl_lock();
933         b = tipc_bearer_find(net, name);
934         if (!b) {
935                 rtnl_unlock();
936                 return -EINVAL;
937         }
938 
939 #ifdef CONFIG_TIPC_MEDIA_UDP
940         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
941                 err = tipc_udp_nl_bearer_add(b,
942                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
943                 if (err) {
944                         rtnl_unlock();
945                         return err;
946                 }
947         }
948 #endif
949         rtnl_unlock();
950 
951         return 0;
952 }
953 
954 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
955 {
956         struct tipc_bearer *b;
957         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
958         struct net *net = sock_net(skb->sk);
959         char *name;
960         int err;
961 
962         if (!info->attrs[TIPC_NLA_BEARER])
963                 return -EINVAL;
964 
965         err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
966                                info->attrs[TIPC_NLA_BEARER],
967                                tipc_nl_bearer_policy, info->extack);
968         if (err)
969                 return err;
970 
971         if (!attrs[TIPC_NLA_BEARER_NAME])
972                 return -EINVAL;
973         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
974 
975         b = tipc_bearer_find(net, name);
976         if (!b)
977                 return -EINVAL;
978 
979         if (attrs[TIPC_NLA_BEARER_PROP]) {
980                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
981 
982                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
983                                               props);
984                 if (err)
985                         return err;
986 
987                 if (props[TIPC_NLA_PROP_TOL]) {
988                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
989                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
990                 }
991                 if (props[TIPC_NLA_PROP_PRIO])
992                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
993                 if (props[TIPC_NLA_PROP_WIN])
994                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
995                 if (props[TIPC_NLA_PROP_MTU]) {
996                         if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
997                                 return -EINVAL;
998 #ifdef CONFIG_TIPC_MEDIA_UDP
999                         if (tipc_udp_mtu_bad(nla_get_u32
1000                                              (props[TIPC_NLA_PROP_MTU])))
1001                                 return -EINVAL;
1002                         b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1003                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1004 #endif
1005                 }
1006         }
1007 
1008         return 0;
1009 }
1010 
1011 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1012 {
1013         int err;
1014 
1015         rtnl_lock();
1016         err = __tipc_nl_bearer_set(skb, info);
1017         rtnl_unlock();
1018 
1019         return err;
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         if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1051                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1052                         goto prop_msg_full;
1053 
1054         nla_nest_end(msg->skb, prop);
1055         nla_nest_end(msg->skb, attrs);
1056         genlmsg_end(msg->skb, hdr);
1057 
1058         return 0;
1059 
1060 prop_msg_full:
1061         nla_nest_cancel(msg->skb, prop);
1062 attr_msg_full:
1063         nla_nest_cancel(msg->skb, attrs);
1064 msg_full:
1065         genlmsg_cancel(msg->skb, hdr);
1066 
1067         return -EMSGSIZE;
1068 }
1069 
1070 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1071 {
1072         int err;
1073         int i = cb->args[0];
1074         struct tipc_nl_msg msg;
1075 
1076         if (i == MAX_MEDIA)
1077                 return 0;
1078 
1079         msg.skb = skb;
1080         msg.portid = NETLINK_CB(cb->skb).portid;
1081         msg.seq = cb->nlh->nlmsg_seq;
1082 
1083         rtnl_lock();
1084         for (; media_info_array[i] != NULL; i++) {
1085                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1086                                           NLM_F_MULTI);
1087                 if (err)
1088                         break;
1089         }
1090         rtnl_unlock();
1091 
1092         cb->args[0] = i;
1093         return skb->len;
1094 }
1095 
1096 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1097 {
1098         int err;
1099         char *name;
1100         struct tipc_nl_msg msg;
1101         struct tipc_media *media;
1102         struct sk_buff *rep;
1103         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1104 
1105         if (!info->attrs[TIPC_NLA_MEDIA])
1106                 return -EINVAL;
1107 
1108         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1109                                info->attrs[TIPC_NLA_MEDIA],
1110                                tipc_nl_media_policy, info->extack);
1111         if (err)
1112                 return err;
1113 
1114         if (!attrs[TIPC_NLA_MEDIA_NAME])
1115                 return -EINVAL;
1116         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1117 
1118         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1119         if (!rep)
1120                 return -ENOMEM;
1121 
1122         msg.skb = rep;
1123         msg.portid = info->snd_portid;
1124         msg.seq = info->snd_seq;
1125 
1126         rtnl_lock();
1127         media = tipc_media_find(name);
1128         if (!media) {
1129                 err = -EINVAL;
1130                 goto err_out;
1131         }
1132 
1133         err = __tipc_nl_add_media(&msg, media, 0);
1134         if (err)
1135                 goto err_out;
1136         rtnl_unlock();
1137 
1138         return genlmsg_reply(rep, info);
1139 err_out:
1140         rtnl_unlock();
1141         nlmsg_free(rep);
1142 
1143         return err;
1144 }
1145 
1146 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1147 {
1148         int err;
1149         char *name;
1150         struct tipc_media *m;
1151         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1152 
1153         if (!info->attrs[TIPC_NLA_MEDIA])
1154                 return -EINVAL;
1155 
1156         err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1157                                info->attrs[TIPC_NLA_MEDIA],
1158                                tipc_nl_media_policy, info->extack);
1159 
1160         if (!attrs[TIPC_NLA_MEDIA_NAME])
1161                 return -EINVAL;
1162         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1163 
1164         m = tipc_media_find(name);
1165         if (!m)
1166                 return -EINVAL;
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                         return err;
1175 
1176                 if (props[TIPC_NLA_PROP_TOL])
1177                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1178                 if (props[TIPC_NLA_PROP_PRIO])
1179                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1180                 if (props[TIPC_NLA_PROP_WIN])
1181                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1182                 if (props[TIPC_NLA_PROP_MTU]) {
1183                         if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1184                                 return -EINVAL;
1185 #ifdef CONFIG_TIPC_MEDIA_UDP
1186                         if (tipc_udp_mtu_bad(nla_get_u32
1187                                              (props[TIPC_NLA_PROP_MTU])))
1188                                 return -EINVAL;
1189                         m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1190 #endif
1191                 }
1192         }
1193 
1194         return 0;
1195 }
1196 
1197 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1198 {
1199         int err;
1200 
1201         rtnl_lock();
1202         err = __tipc_nl_media_set(skb, info);
1203         rtnl_unlock();
1204 
1205         return err;
1206 }
1207 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp