Root/
1 | /* |
2 | * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: |
3 | * |
4 | * Marek Lindner, Simon Wunderlich |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of version 2 of the GNU General Public |
8 | * License as published by the Free Software Foundation. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
18 | * 02110-1301, USA |
19 | * |
20 | */ |
21 | |
22 | #include "main.h" |
23 | #include "hard-interface.h" |
24 | #include "soft-interface.h" |
25 | #include "send.h" |
26 | #include "translation-table.h" |
27 | #include "routing.h" |
28 | #include "bat_sysfs.h" |
29 | #include "originator.h" |
30 | #include "hash.h" |
31 | |
32 | #include <linux/if_arp.h> |
33 | |
34 | /* protect update critical side of if_list - but not the content */ |
35 | static DEFINE_SPINLOCK(if_list_lock); |
36 | |
37 | static void hardif_free_rcu(struct rcu_head *rcu) |
38 | { |
39 | struct batman_if *batman_if; |
40 | |
41 | batman_if = container_of(rcu, struct batman_if, rcu); |
42 | dev_put(batman_if->net_dev); |
43 | kref_put(&batman_if->refcount, hardif_free_ref); |
44 | } |
45 | |
46 | struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev) |
47 | { |
48 | struct batman_if *batman_if; |
49 | |
50 | rcu_read_lock(); |
51 | list_for_each_entry_rcu(batman_if, &if_list, list) { |
52 | if (batman_if->net_dev == net_dev) |
53 | goto out; |
54 | } |
55 | |
56 | batman_if = NULL; |
57 | |
58 | out: |
59 | if (batman_if) |
60 | kref_get(&batman_if->refcount); |
61 | |
62 | rcu_read_unlock(); |
63 | return batman_if; |
64 | } |
65 | |
66 | static int is_valid_iface(struct net_device *net_dev) |
67 | { |
68 | if (net_dev->flags & IFF_LOOPBACK) |
69 | return 0; |
70 | |
71 | if (net_dev->type != ARPHRD_ETHER) |
72 | return 0; |
73 | |
74 | if (net_dev->addr_len != ETH_ALEN) |
75 | return 0; |
76 | |
77 | /* no batman over batman */ |
78 | #ifdef HAVE_NET_DEVICE_OPS |
79 | if (net_dev->netdev_ops->ndo_start_xmit == interface_tx) |
80 | return 0; |
81 | #else |
82 | if (net_dev->hard_start_xmit == interface_tx) |
83 | return 0; |
84 | #endif |
85 | |
86 | /* Device is being bridged */ |
87 | /* if (net_dev->priv_flags & IFF_BRIDGE_PORT) |
88 | return 0; */ |
89 | |
90 | return 1; |
91 | } |
92 | |
93 | static struct batman_if *get_active_batman_if(struct net_device *soft_iface) |
94 | { |
95 | struct batman_if *batman_if; |
96 | |
97 | rcu_read_lock(); |
98 | list_for_each_entry_rcu(batman_if, &if_list, list) { |
99 | if (batman_if->soft_iface != soft_iface) |
100 | continue; |
101 | |
102 | if (batman_if->if_status == IF_ACTIVE) |
103 | goto out; |
104 | } |
105 | |
106 | batman_if = NULL; |
107 | |
108 | out: |
109 | if (batman_if) |
110 | kref_get(&batman_if->refcount); |
111 | |
112 | rcu_read_unlock(); |
113 | return batman_if; |
114 | } |
115 | |
116 | static void update_primary_addr(struct bat_priv *bat_priv) |
117 | { |
118 | struct vis_packet *vis_packet; |
119 | |
120 | vis_packet = (struct vis_packet *) |
121 | bat_priv->my_vis_info->skb_packet->data; |
122 | memcpy(vis_packet->vis_orig, |
123 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); |
124 | memcpy(vis_packet->sender_orig, |
125 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); |
126 | } |
127 | |
128 | static void set_primary_if(struct bat_priv *bat_priv, |
129 | struct batman_if *batman_if) |
130 | { |
131 | struct batman_packet *batman_packet; |
132 | struct batman_if *old_if; |
133 | |
134 | if (batman_if) |
135 | kref_get(&batman_if->refcount); |
136 | |
137 | old_if = bat_priv->primary_if; |
138 | bat_priv->primary_if = batman_if; |
139 | |
140 | if (old_if) |
141 | kref_put(&old_if->refcount, hardif_free_ref); |
142 | |
143 | if (!bat_priv->primary_if) |
144 | return; |
145 | |
146 | batman_packet = (struct batman_packet *)(batman_if->packet_buff); |
147 | batman_packet->flags = PRIMARIES_FIRST_HOP; |
148 | batman_packet->ttl = TTL; |
149 | |
150 | update_primary_addr(bat_priv); |
151 | |
152 | /*** |
153 | * hacky trick to make sure that we send the HNA information via |
154 | * our new primary interface |
155 | */ |
156 | atomic_set(&bat_priv->hna_local_changed, 1); |
157 | } |
158 | |
159 | static bool hardif_is_iface_up(struct batman_if *batman_if) |
160 | { |
161 | if (batman_if->net_dev->flags & IFF_UP) |
162 | return true; |
163 | |
164 | return false; |
165 | } |
166 | |
167 | static void update_mac_addresses(struct batman_if *batman_if) |
168 | { |
169 | memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig, |
170 | batman_if->net_dev->dev_addr, ETH_ALEN); |
171 | memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender, |
172 | batman_if->net_dev->dev_addr, ETH_ALEN); |
173 | } |
174 | |
175 | static void check_known_mac_addr(struct net_device *net_dev) |
176 | { |
177 | struct batman_if *batman_if; |
178 | |
179 | rcu_read_lock(); |
180 | list_for_each_entry_rcu(batman_if, &if_list, list) { |
181 | if ((batman_if->if_status != IF_ACTIVE) && |
182 | (batman_if->if_status != IF_TO_BE_ACTIVATED)) |
183 | continue; |
184 | |
185 | if (batman_if->net_dev == net_dev) |
186 | continue; |
187 | |
188 | if (!compare_orig(batman_if->net_dev->dev_addr, |
189 | net_dev->dev_addr)) |
190 | continue; |
191 | |
192 | pr_warning("The newly added mac address (%pM) already exists " |
193 | "on: %s\n", net_dev->dev_addr, |
194 | batman_if->net_dev->name); |
195 | pr_warning("It is strongly recommended to keep mac addresses " |
196 | "unique to avoid problems!\n"); |
197 | } |
198 | rcu_read_unlock(); |
199 | } |
200 | |
201 | int hardif_min_mtu(struct net_device *soft_iface) |
202 | { |
203 | struct bat_priv *bat_priv = netdev_priv(soft_iface); |
204 | struct batman_if *batman_if; |
205 | /* allow big frames if all devices are capable to do so |
206 | * (have MTU > 1500 + BAT_HEADER_LEN) */ |
207 | int min_mtu = ETH_DATA_LEN; |
208 | |
209 | if (atomic_read(&bat_priv->fragmentation)) |
210 | goto out; |
211 | |
212 | rcu_read_lock(); |
213 | list_for_each_entry_rcu(batman_if, &if_list, list) { |
214 | if ((batman_if->if_status != IF_ACTIVE) && |
215 | (batman_if->if_status != IF_TO_BE_ACTIVATED)) |
216 | continue; |
217 | |
218 | if (batman_if->soft_iface != soft_iface) |
219 | continue; |
220 | |
221 | min_mtu = min_t(int, batman_if->net_dev->mtu - BAT_HEADER_LEN, |
222 | min_mtu); |
223 | } |
224 | rcu_read_unlock(); |
225 | out: |
226 | return min_mtu; |
227 | } |
228 | |
229 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ |
230 | void update_min_mtu(struct net_device *soft_iface) |
231 | { |
232 | int min_mtu; |
233 | |
234 | min_mtu = hardif_min_mtu(soft_iface); |
235 | if (soft_iface->mtu != min_mtu) |
236 | soft_iface->mtu = min_mtu; |
237 | } |
238 | |
239 | static void hardif_activate_interface(struct batman_if *batman_if) |
240 | { |
241 | struct bat_priv *bat_priv; |
242 | |
243 | if (batman_if->if_status != IF_INACTIVE) |
244 | return; |
245 | |
246 | bat_priv = netdev_priv(batman_if->soft_iface); |
247 | |
248 | update_mac_addresses(batman_if); |
249 | batman_if->if_status = IF_TO_BE_ACTIVATED; |
250 | |
251 | /** |
252 | * the first active interface becomes our primary interface or |
253 | * the next active interface after the old primay interface was removed |
254 | */ |
255 | if (!bat_priv->primary_if) |
256 | set_primary_if(bat_priv, batman_if); |
257 | |
258 | bat_info(batman_if->soft_iface, "Interface activated: %s\n", |
259 | batman_if->net_dev->name); |
260 | |
261 | update_min_mtu(batman_if->soft_iface); |
262 | return; |
263 | } |
264 | |
265 | static void hardif_deactivate_interface(struct batman_if *batman_if) |
266 | { |
267 | if ((batman_if->if_status != IF_ACTIVE) && |
268 | (batman_if->if_status != IF_TO_BE_ACTIVATED)) |
269 | return; |
270 | |
271 | batman_if->if_status = IF_INACTIVE; |
272 | |
273 | bat_info(batman_if->soft_iface, "Interface deactivated: %s\n", |
274 | batman_if->net_dev->name); |
275 | |
276 | update_min_mtu(batman_if->soft_iface); |
277 | } |
278 | |
279 | int hardif_enable_interface(struct batman_if *batman_if, char *iface_name) |
280 | { |
281 | struct bat_priv *bat_priv; |
282 | struct batman_packet *batman_packet; |
283 | |
284 | if (batman_if->if_status != IF_NOT_IN_USE) |
285 | goto out; |
286 | |
287 | batman_if->soft_iface = dev_get_by_name(&init_net, iface_name); |
288 | |
289 | if (!batman_if->soft_iface) { |
290 | batman_if->soft_iface = softif_create(iface_name); |
291 | |
292 | if (!batman_if->soft_iface) |
293 | goto err; |
294 | |
295 | /* dev_get_by_name() increases the reference counter for us */ |
296 | dev_hold(batman_if->soft_iface); |
297 | } |
298 | |
299 | bat_priv = netdev_priv(batman_if->soft_iface); |
300 | batman_if->packet_len = BAT_PACKET_LEN; |
301 | batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC); |
302 | |
303 | if (!batman_if->packet_buff) { |
304 | bat_err(batman_if->soft_iface, "Can't add interface packet " |
305 | "(%s): out of memory\n", batman_if->net_dev->name); |
306 | goto err; |
307 | } |
308 | |
309 | batman_packet = (struct batman_packet *)(batman_if->packet_buff); |
310 | batman_packet->packet_type = BAT_PACKET; |
311 | batman_packet->version = COMPAT_VERSION; |
312 | batman_packet->flags = 0; |
313 | batman_packet->ttl = 2; |
314 | batman_packet->tq = TQ_MAX_VALUE; |
315 | batman_packet->num_hna = 0; |
316 | |
317 | batman_if->if_num = bat_priv->num_ifaces; |
318 | bat_priv->num_ifaces++; |
319 | batman_if->if_status = IF_INACTIVE; |
320 | orig_hash_add_if(batman_if, bat_priv->num_ifaces); |
321 | |
322 | batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN); |
323 | batman_if->batman_adv_ptype.func = batman_skb_recv; |
324 | batman_if->batman_adv_ptype.dev = batman_if->net_dev; |
325 | kref_get(&batman_if->refcount); |
326 | dev_add_pack(&batman_if->batman_adv_ptype); |
327 | |
328 | atomic_set(&batman_if->seqno, 1); |
329 | atomic_set(&batman_if->frag_seqno, 1); |
330 | bat_info(batman_if->soft_iface, "Adding interface: %s\n", |
331 | batman_if->net_dev->name); |
332 | |
333 | if (atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu < |
334 | ETH_DATA_LEN + BAT_HEADER_LEN) |
335 | bat_info(batman_if->soft_iface, |
336 | "The MTU of interface %s is too small (%i) to handle " |
337 | "the transport of batman-adv packets. Packets going " |
338 | "over this interface will be fragmented on layer2 " |
339 | "which could impact the performance. Setting the MTU " |
340 | "to %zi would solve the problem.\n", |
341 | batman_if->net_dev->name, batman_if->net_dev->mtu, |
342 | ETH_DATA_LEN + BAT_HEADER_LEN); |
343 | |
344 | if (!atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu < |
345 | ETH_DATA_LEN + BAT_HEADER_LEN) |
346 | bat_info(batman_if->soft_iface, |
347 | "The MTU of interface %s is too small (%i) to handle " |
348 | "the transport of batman-adv packets. If you experience" |
349 | " problems getting traffic through try increasing the " |
350 | "MTU to %zi.\n", |
351 | batman_if->net_dev->name, batman_if->net_dev->mtu, |
352 | ETH_DATA_LEN + BAT_HEADER_LEN); |
353 | |
354 | if (hardif_is_iface_up(batman_if)) |
355 | hardif_activate_interface(batman_if); |
356 | else |
357 | bat_err(batman_if->soft_iface, "Not using interface %s " |
358 | "(retrying later): interface not active\n", |
359 | batman_if->net_dev->name); |
360 | |
361 | /* begin scheduling originator messages on that interface */ |
362 | schedule_own_packet(batman_if); |
363 | |
364 | out: |
365 | return 0; |
366 | |
367 | err: |
368 | return -ENOMEM; |
369 | } |
370 | |
371 | void hardif_disable_interface(struct batman_if *batman_if) |
372 | { |
373 | struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); |
374 | |
375 | if (batman_if->if_status == IF_ACTIVE) |
376 | hardif_deactivate_interface(batman_if); |
377 | |
378 | if (batman_if->if_status != IF_INACTIVE) |
379 | return; |
380 | |
381 | bat_info(batman_if->soft_iface, "Removing interface: %s\n", |
382 | batman_if->net_dev->name); |
383 | dev_remove_pack(&batman_if->batman_adv_ptype); |
384 | kref_put(&batman_if->refcount, hardif_free_ref); |
385 | |
386 | bat_priv->num_ifaces--; |
387 | orig_hash_del_if(batman_if, bat_priv->num_ifaces); |
388 | |
389 | if (batman_if == bat_priv->primary_if) { |
390 | struct batman_if *new_if; |
391 | |
392 | new_if = get_active_batman_if(batman_if->soft_iface); |
393 | set_primary_if(bat_priv, new_if); |
394 | |
395 | if (new_if) |
396 | kref_put(&new_if->refcount, hardif_free_ref); |
397 | } |
398 | |
399 | kfree(batman_if->packet_buff); |
400 | batman_if->packet_buff = NULL; |
401 | batman_if->if_status = IF_NOT_IN_USE; |
402 | |
403 | /* delete all references to this batman_if */ |
404 | purge_orig_ref(bat_priv); |
405 | purge_outstanding_packets(bat_priv, batman_if); |
406 | dev_put(batman_if->soft_iface); |
407 | |
408 | /* nobody uses this interface anymore */ |
409 | if (!bat_priv->num_ifaces) |
410 | softif_destroy(batman_if->soft_iface); |
411 | |
412 | batman_if->soft_iface = NULL; |
413 | } |
414 | |
415 | static struct batman_if *hardif_add_interface(struct net_device *net_dev) |
416 | { |
417 | struct batman_if *batman_if; |
418 | int ret; |
419 | |
420 | ret = is_valid_iface(net_dev); |
421 | if (ret != 1) |
422 | goto out; |
423 | |
424 | dev_hold(net_dev); |
425 | |
426 | batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC); |
427 | if (!batman_if) { |
428 | pr_err("Can't add interface (%s): out of memory\n", |
429 | net_dev->name); |
430 | goto release_dev; |
431 | } |
432 | |
433 | ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev); |
434 | if (ret) |
435 | goto free_if; |
436 | |
437 | batman_if->if_num = -1; |
438 | batman_if->net_dev = net_dev; |
439 | batman_if->soft_iface = NULL; |
440 | batman_if->if_status = IF_NOT_IN_USE; |
441 | INIT_LIST_HEAD(&batman_if->list); |
442 | kref_init(&batman_if->refcount); |
443 | |
444 | check_known_mac_addr(batman_if->net_dev); |
445 | |
446 | spin_lock(&if_list_lock); |
447 | list_add_tail_rcu(&batman_if->list, &if_list); |
448 | spin_unlock(&if_list_lock); |
449 | |
450 | /* extra reference for return */ |
451 | kref_get(&batman_if->refcount); |
452 | return batman_if; |
453 | |
454 | free_if: |
455 | kfree(batman_if); |
456 | release_dev: |
457 | dev_put(net_dev); |
458 | out: |
459 | return NULL; |
460 | } |
461 | |
462 | static void hardif_remove_interface(struct batman_if *batman_if) |
463 | { |
464 | /* first deactivate interface */ |
465 | if (batman_if->if_status != IF_NOT_IN_USE) |
466 | hardif_disable_interface(batman_if); |
467 | |
468 | if (batman_if->if_status != IF_NOT_IN_USE) |
469 | return; |
470 | |
471 | batman_if->if_status = IF_TO_BE_REMOVED; |
472 | sysfs_del_hardif(&batman_if->hardif_obj); |
473 | call_rcu(&batman_if->rcu, hardif_free_rcu); |
474 | } |
475 | |
476 | void hardif_remove_interfaces(void) |
477 | { |
478 | struct batman_if *batman_if, *batman_if_tmp; |
479 | struct list_head if_queue; |
480 | |
481 | INIT_LIST_HEAD(&if_queue); |
482 | |
483 | spin_lock(&if_list_lock); |
484 | list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) { |
485 | list_del_rcu(&batman_if->list); |
486 | list_add_tail(&batman_if->list, &if_queue); |
487 | } |
488 | spin_unlock(&if_list_lock); |
489 | |
490 | rtnl_lock(); |
491 | list_for_each_entry_safe(batman_if, batman_if_tmp, &if_queue, list) { |
492 | hardif_remove_interface(batman_if); |
493 | } |
494 | rtnl_unlock(); |
495 | } |
496 | |
497 | static int hard_if_event(struct notifier_block *this, |
498 | unsigned long event, void *ptr) |
499 | { |
500 | struct net_device *net_dev = (struct net_device *)ptr; |
501 | struct batman_if *batman_if = get_batman_if_by_netdev(net_dev); |
502 | struct bat_priv *bat_priv; |
503 | |
504 | if (!batman_if && event == NETDEV_REGISTER) |
505 | batman_if = hardif_add_interface(net_dev); |
506 | |
507 | if (!batman_if) |
508 | goto out; |
509 | |
510 | switch (event) { |
511 | case NETDEV_UP: |
512 | hardif_activate_interface(batman_if); |
513 | break; |
514 | case NETDEV_GOING_DOWN: |
515 | case NETDEV_DOWN: |
516 | hardif_deactivate_interface(batman_if); |
517 | break; |
518 | case NETDEV_UNREGISTER: |
519 | spin_lock(&if_list_lock); |
520 | list_del_rcu(&batman_if->list); |
521 | spin_unlock(&if_list_lock); |
522 | |
523 | hardif_remove_interface(batman_if); |
524 | break; |
525 | case NETDEV_CHANGEMTU: |
526 | if (batman_if->soft_iface) |
527 | update_min_mtu(batman_if->soft_iface); |
528 | break; |
529 | case NETDEV_CHANGEADDR: |
530 | if (batman_if->if_status == IF_NOT_IN_USE) |
531 | goto hardif_put; |
532 | |
533 | check_known_mac_addr(batman_if->net_dev); |
534 | update_mac_addresses(batman_if); |
535 | |
536 | bat_priv = netdev_priv(batman_if->soft_iface); |
537 | if (batman_if == bat_priv->primary_if) |
538 | update_primary_addr(bat_priv); |
539 | break; |
540 | default: |
541 | break; |
542 | }; |
543 | |
544 | hardif_put: |
545 | kref_put(&batman_if->refcount, hardif_free_ref); |
546 | out: |
547 | return NOTIFY_DONE; |
548 | } |
549 | |
550 | /* receive a packet with the batman ethertype coming on a hard |
551 | * interface */ |
552 | int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
553 | struct packet_type *ptype, struct net_device *orig_dev) |
554 | { |
555 | struct bat_priv *bat_priv; |
556 | struct batman_packet *batman_packet; |
557 | struct batman_if *batman_if; |
558 | int ret; |
559 | |
560 | batman_if = container_of(ptype, struct batman_if, batman_adv_ptype); |
561 | skb = skb_share_check(skb, GFP_ATOMIC); |
562 | |
563 | /* skb was released by skb_share_check() */ |
564 | if (!skb) |
565 | goto err_out; |
566 | |
567 | /* packet should hold at least type and version */ |
568 | if (unlikely(!pskb_may_pull(skb, 2))) |
569 | goto err_free; |
570 | |
571 | /* expect a valid ethernet header here. */ |
572 | if (unlikely(skb->mac_len != sizeof(struct ethhdr) |
573 | || !skb_mac_header(skb))) |
574 | goto err_free; |
575 | |
576 | if (!batman_if->soft_iface) |
577 | goto err_free; |
578 | |
579 | bat_priv = netdev_priv(batman_if->soft_iface); |
580 | |
581 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) |
582 | goto err_free; |
583 | |
584 | /* discard frames on not active interfaces */ |
585 | if (batman_if->if_status != IF_ACTIVE) |
586 | goto err_free; |
587 | |
588 | batman_packet = (struct batman_packet *)skb->data; |
589 | |
590 | if (batman_packet->version != COMPAT_VERSION) { |
591 | bat_dbg(DBG_BATMAN, bat_priv, |
592 | "Drop packet: incompatible batman version (%i)\n", |
593 | batman_packet->version); |
594 | goto err_free; |
595 | } |
596 | |
597 | /* all receive handlers return whether they received or reused |
598 | * the supplied skb. if not, we have to free the skb. */ |
599 | |
600 | switch (batman_packet->packet_type) { |
601 | /* batman originator packet */ |
602 | case BAT_PACKET: |
603 | ret = recv_bat_packet(skb, batman_if); |
604 | break; |
605 | |
606 | /* batman icmp packet */ |
607 | case BAT_ICMP: |
608 | ret = recv_icmp_packet(skb, batman_if); |
609 | break; |
610 | |
611 | /* unicast packet */ |
612 | case BAT_UNICAST: |
613 | ret = recv_unicast_packet(skb, batman_if); |
614 | break; |
615 | |
616 | /* fragmented unicast packet */ |
617 | case BAT_UNICAST_FRAG: |
618 | ret = recv_ucast_frag_packet(skb, batman_if); |
619 | break; |
620 | |
621 | /* broadcast packet */ |
622 | case BAT_BCAST: |
623 | ret = recv_bcast_packet(skb, batman_if); |
624 | break; |
625 | |
626 | /* vis packet */ |
627 | case BAT_VIS: |
628 | ret = recv_vis_packet(skb, batman_if); |
629 | break; |
630 | default: |
631 | ret = NET_RX_DROP; |
632 | } |
633 | |
634 | if (ret == NET_RX_DROP) |
635 | kfree_skb(skb); |
636 | |
637 | /* return NET_RX_SUCCESS in any case as we |
638 | * most probably dropped the packet for |
639 | * routing-logical reasons. */ |
640 | |
641 | return NET_RX_SUCCESS; |
642 | |
643 | err_free: |
644 | kfree_skb(skb); |
645 | err_out: |
646 | return NET_RX_DROP; |
647 | } |
648 | |
649 | struct notifier_block hard_if_notifier = { |
650 | .notifier_call = hard_if_event, |
651 | }; |
652 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9