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1 | /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: |
2 | * |
3 | * Marek Lindner, Simon Wunderlich |
4 | * |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of version 2 of the GNU General Public |
7 | * License as published by the Free Software Foundation. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include "main.h" |
19 | #include "distributed-arp-table.h" |
20 | #include "send.h" |
21 | #include "routing.h" |
22 | #include "translation-table.h" |
23 | #include "soft-interface.h" |
24 | #include "hard-interface.h" |
25 | #include "gateway_common.h" |
26 | #include "gateway_client.h" |
27 | #include "originator.h" |
28 | #include "network-coding.h" |
29 | #include "fragmentation.h" |
30 | #include "multicast.h" |
31 | |
32 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work); |
33 | |
34 | /* send out an already prepared packet to the given address via the |
35 | * specified batman interface |
36 | */ |
37 | int batadv_send_skb_packet(struct sk_buff *skb, |
38 | struct batadv_hard_iface *hard_iface, |
39 | const uint8_t *dst_addr) |
40 | { |
41 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
42 | struct ethhdr *ethhdr; |
43 | |
44 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
45 | goto send_skb_err; |
46 | |
47 | if (unlikely(!hard_iface->net_dev)) |
48 | goto send_skb_err; |
49 | |
50 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
51 | pr_warn("Interface %s is not up - can't send packet via that interface!\n", |
52 | hard_iface->net_dev->name); |
53 | goto send_skb_err; |
54 | } |
55 | |
56 | /* push to the ethernet header. */ |
57 | if (batadv_skb_head_push(skb, ETH_HLEN) < 0) |
58 | goto send_skb_err; |
59 | |
60 | skb_reset_mac_header(skb); |
61 | |
62 | ethhdr = eth_hdr(skb); |
63 | ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); |
64 | ether_addr_copy(ethhdr->h_dest, dst_addr); |
65 | ethhdr->h_proto = htons(ETH_P_BATMAN); |
66 | |
67 | skb_set_network_header(skb, ETH_HLEN); |
68 | skb->protocol = htons(ETH_P_BATMAN); |
69 | |
70 | skb->dev = hard_iface->net_dev; |
71 | |
72 | /* Save a clone of the skb to use when decoding coded packets */ |
73 | batadv_nc_skb_store_for_decoding(bat_priv, skb); |
74 | |
75 | /* dev_queue_xmit() returns a negative result on error. However on |
76 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP |
77 | * (which is > 0). This will not be treated as an error. |
78 | */ |
79 | return dev_queue_xmit(skb); |
80 | send_skb_err: |
81 | kfree_skb(skb); |
82 | return NET_XMIT_DROP; |
83 | } |
84 | |
85 | /** |
86 | * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. |
87 | * @skb: Packet to be transmitted. |
88 | * @orig_node: Final destination of the packet. |
89 | * @recv_if: Interface used when receiving the packet (can be NULL). |
90 | * |
91 | * Looks up the best next-hop towards the passed originator and passes the |
92 | * skb on for preparation of MAC header. If the packet originated from this |
93 | * host, NULL can be passed as recv_if and no interface alternating is |
94 | * attempted. |
95 | * |
96 | * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or |
97 | * NET_XMIT_POLICED if the skb is buffered for later transmit. |
98 | */ |
99 | int batadv_send_skb_to_orig(struct sk_buff *skb, |
100 | struct batadv_orig_node *orig_node, |
101 | struct batadv_hard_iface *recv_if) |
102 | { |
103 | struct batadv_priv *bat_priv = orig_node->bat_priv; |
104 | struct batadv_neigh_node *neigh_node; |
105 | int ret = NET_XMIT_DROP; |
106 | |
107 | /* batadv_find_router() increases neigh_nodes refcount if found. */ |
108 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
109 | if (!neigh_node) |
110 | goto out; |
111 | |
112 | /* Check if the skb is too large to send in one piece and fragment |
113 | * it if needed. |
114 | */ |
115 | if (atomic_read(&bat_priv->fragmentation) && |
116 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
117 | /* Fragment and send packet. */ |
118 | if (batadv_frag_send_packet(skb, orig_node, neigh_node)) |
119 | ret = NET_XMIT_SUCCESS; |
120 | |
121 | goto out; |
122 | } |
123 | |
124 | /* try to network code the packet, if it is received on an interface |
125 | * (i.e. being forwarded). If the packet originates from this node or if |
126 | * network coding fails, then send the packet as usual. |
127 | */ |
128 | if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { |
129 | ret = NET_XMIT_POLICED; |
130 | } else { |
131 | batadv_send_skb_packet(skb, neigh_node->if_incoming, |
132 | neigh_node->addr); |
133 | ret = NET_XMIT_SUCCESS; |
134 | } |
135 | |
136 | out: |
137 | if (neigh_node) |
138 | batadv_neigh_node_free_ref(neigh_node); |
139 | |
140 | return ret; |
141 | } |
142 | |
143 | /** |
144 | * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the |
145 | * common fields for unicast packets |
146 | * @skb: the skb carrying the unicast header to initialize |
147 | * @hdr_size: amount of bytes to push at the beginning of the skb |
148 | * @orig_node: the destination node |
149 | * |
150 | * Returns false if the buffer extension was not possible or true otherwise. |
151 | */ |
152 | static bool |
153 | batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, |
154 | struct batadv_orig_node *orig_node) |
155 | { |
156 | struct batadv_unicast_packet *unicast_packet; |
157 | uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); |
158 | |
159 | if (batadv_skb_head_push(skb, hdr_size) < 0) |
160 | return false; |
161 | |
162 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
163 | unicast_packet->version = BATADV_COMPAT_VERSION; |
164 | /* batman packet type: unicast */ |
165 | unicast_packet->packet_type = BATADV_UNICAST; |
166 | /* set unicast ttl */ |
167 | unicast_packet->ttl = BATADV_TTL; |
168 | /* copy the destination for faster routing */ |
169 | ether_addr_copy(unicast_packet->dest, orig_node->orig); |
170 | /* set the destination tt version number */ |
171 | unicast_packet->ttvn = ttvn; |
172 | |
173 | return true; |
174 | } |
175 | |
176 | /** |
177 | * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header |
178 | * @skb: the skb containing the payload to encapsulate |
179 | * @orig_node: the destination node |
180 | * |
181 | * Returns false if the payload could not be encapsulated or true otherwise. |
182 | */ |
183 | static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, |
184 | struct batadv_orig_node *orig_node) |
185 | { |
186 | size_t uni_size = sizeof(struct batadv_unicast_packet); |
187 | |
188 | return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); |
189 | } |
190 | |
191 | /** |
192 | * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a |
193 | * unicast 4addr header |
194 | * @bat_priv: the bat priv with all the soft interface information |
195 | * @skb: the skb containing the payload to encapsulate |
196 | * @orig_node: the destination node |
197 | * @packet_subtype: the unicast 4addr packet subtype to use |
198 | * |
199 | * Returns false if the payload could not be encapsulated or true otherwise. |
200 | */ |
201 | bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, |
202 | struct sk_buff *skb, |
203 | struct batadv_orig_node *orig, |
204 | int packet_subtype) |
205 | { |
206 | struct batadv_hard_iface *primary_if; |
207 | struct batadv_unicast_4addr_packet *uc_4addr_packet; |
208 | bool ret = false; |
209 | |
210 | primary_if = batadv_primary_if_get_selected(bat_priv); |
211 | if (!primary_if) |
212 | goto out; |
213 | |
214 | /* Pull the header space and fill the unicast_packet substructure. |
215 | * We can do that because the first member of the uc_4addr_packet |
216 | * is of type struct unicast_packet |
217 | */ |
218 | if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), |
219 | orig)) |
220 | goto out; |
221 | |
222 | uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
223 | uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; |
224 | ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); |
225 | uc_4addr_packet->subtype = packet_subtype; |
226 | uc_4addr_packet->reserved = 0; |
227 | |
228 | ret = true; |
229 | out: |
230 | if (primary_if) |
231 | batadv_hardif_free_ref(primary_if); |
232 | return ret; |
233 | } |
234 | |
235 | /** |
236 | * batadv_send_skb_unicast - encapsulate and send an skb via unicast |
237 | * @bat_priv: the bat priv with all the soft interface information |
238 | * @skb: payload to send |
239 | * @packet_type: the batman unicast packet type to use |
240 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast |
241 | * 4addr packets) |
242 | * @orig_node: the originator to send the packet to |
243 | * @vid: the vid to be used to search the translation table |
244 | * |
245 | * Wrap the given skb into a batman-adv unicast or unicast-4addr header |
246 | * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied |
247 | * as packet_type. Then send this frame to the given orig_node and release a |
248 | * reference to this orig_node. |
249 | * |
250 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
251 | */ |
252 | int batadv_send_skb_unicast(struct batadv_priv *bat_priv, |
253 | struct sk_buff *skb, int packet_type, |
254 | int packet_subtype, |
255 | struct batadv_orig_node *orig_node, |
256 | unsigned short vid) |
257 | { |
258 | struct ethhdr *ethhdr; |
259 | struct batadv_unicast_packet *unicast_packet; |
260 | int ret = NET_XMIT_DROP; |
261 | |
262 | if (!orig_node) |
263 | goto out; |
264 | |
265 | switch (packet_type) { |
266 | case BATADV_UNICAST: |
267 | if (!batadv_send_skb_prepare_unicast(skb, orig_node)) |
268 | goto out; |
269 | break; |
270 | case BATADV_UNICAST_4ADDR: |
271 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, |
272 | orig_node, |
273 | packet_subtype)) |
274 | goto out; |
275 | break; |
276 | default: |
277 | /* this function supports UNICAST and UNICAST_4ADDR only. It |
278 | * should never be invoked with any other packet type |
279 | */ |
280 | goto out; |
281 | } |
282 | |
283 | /* skb->data might have been reallocated by |
284 | * batadv_send_skb_prepare_unicast{,_4addr}() |
285 | */ |
286 | ethhdr = eth_hdr(skb); |
287 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
288 | |
289 | /* inform the destination node that we are still missing a correct route |
290 | * for this client. The destination will receive this packet and will |
291 | * try to reroute it because the ttvn contained in the header is less |
292 | * than the current one |
293 | */ |
294 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) |
295 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
296 | |
297 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
298 | ret = NET_XMIT_SUCCESS; |
299 | |
300 | out: |
301 | if (orig_node) |
302 | batadv_orig_node_free_ref(orig_node); |
303 | if (ret == NET_XMIT_DROP) |
304 | kfree_skb(skb); |
305 | return ret; |
306 | } |
307 | |
308 | /** |
309 | * batadv_send_skb_via_tt_generic - send an skb via TT lookup |
310 | * @bat_priv: the bat priv with all the soft interface information |
311 | * @skb: payload to send |
312 | * @packet_type: the batman unicast packet type to use |
313 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast |
314 | * 4addr packets) |
315 | * @dst_hint: can be used to override the destination contained in the skb |
316 | * @vid: the vid to be used to search the translation table |
317 | * |
318 | * Look up the recipient node for the destination address in the ethernet |
319 | * header via the translation table. Wrap the given skb into a batman-adv |
320 | * unicast or unicast-4addr header depending on whether BATADV_UNICAST or |
321 | * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame |
322 | * to the according destination node. |
323 | * |
324 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
325 | */ |
326 | int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, |
327 | struct sk_buff *skb, int packet_type, |
328 | int packet_subtype, uint8_t *dst_hint, |
329 | unsigned short vid) |
330 | { |
331 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
332 | struct batadv_orig_node *orig_node; |
333 | uint8_t *src, *dst; |
334 | |
335 | src = ethhdr->h_source; |
336 | dst = ethhdr->h_dest; |
337 | |
338 | /* if we got an hint! let's send the packet to this client (if any) */ |
339 | if (dst_hint) { |
340 | src = NULL; |
341 | dst = dst_hint; |
342 | } |
343 | orig_node = batadv_transtable_search(bat_priv, src, dst, vid); |
344 | |
345 | return batadv_send_skb_unicast(bat_priv, skb, packet_type, |
346 | packet_subtype, orig_node, vid); |
347 | } |
348 | |
349 | /** |
350 | * batadv_send_skb_via_gw - send an skb via gateway lookup |
351 | * @bat_priv: the bat priv with all the soft interface information |
352 | * @skb: payload to send |
353 | * @vid: the vid to be used to search the translation table |
354 | * |
355 | * Look up the currently selected gateway. Wrap the given skb into a batman-adv |
356 | * unicast header and send this frame to this gateway node. |
357 | * |
358 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
359 | */ |
360 | int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, |
361 | unsigned short vid) |
362 | { |
363 | struct batadv_orig_node *orig_node; |
364 | |
365 | orig_node = batadv_gw_get_selected_orig(bat_priv); |
366 | return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, |
367 | orig_node, vid); |
368 | } |
369 | |
370 | void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) |
371 | { |
372 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
373 | |
374 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || |
375 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) |
376 | return; |
377 | |
378 | /* the interface gets activated here to avoid race conditions between |
379 | * the moment of activating the interface in |
380 | * hardif_activate_interface() where the originator mac is set and |
381 | * outdated packets (especially uninitialized mac addresses) in the |
382 | * packet queue |
383 | */ |
384 | if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
385 | hard_iface->if_status = BATADV_IF_ACTIVE; |
386 | |
387 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); |
388 | } |
389 | |
390 | static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
391 | { |
392 | if (forw_packet->skb) |
393 | kfree_skb(forw_packet->skb); |
394 | if (forw_packet->if_incoming) |
395 | batadv_hardif_free_ref(forw_packet->if_incoming); |
396 | if (forw_packet->if_outgoing) |
397 | batadv_hardif_free_ref(forw_packet->if_outgoing); |
398 | kfree(forw_packet); |
399 | } |
400 | |
401 | static void |
402 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
403 | struct batadv_forw_packet *forw_packet, |
404 | unsigned long send_time) |
405 | { |
406 | /* add new packet to packet list */ |
407 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
408 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); |
409 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
410 | |
411 | /* start timer for this packet */ |
412 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
413 | send_time); |
414 | } |
415 | |
416 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
417 | * are sent multiple times to increase probability for being received. |
418 | * |
419 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on |
420 | * errors. |
421 | * |
422 | * The skb is not consumed, so the caller should make sure that the |
423 | * skb is freed. |
424 | */ |
425 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
426 | const struct sk_buff *skb, |
427 | unsigned long delay) |
428 | { |
429 | struct batadv_hard_iface *primary_if = NULL; |
430 | struct batadv_forw_packet *forw_packet; |
431 | struct batadv_bcast_packet *bcast_packet; |
432 | struct sk_buff *newskb; |
433 | |
434 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
435 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
436 | "bcast packet queue full\n"); |
437 | goto out; |
438 | } |
439 | |
440 | primary_if = batadv_primary_if_get_selected(bat_priv); |
441 | if (!primary_if) |
442 | goto out_and_inc; |
443 | |
444 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
445 | |
446 | if (!forw_packet) |
447 | goto out_and_inc; |
448 | |
449 | newskb = skb_copy(skb, GFP_ATOMIC); |
450 | if (!newskb) |
451 | goto packet_free; |
452 | |
453 | /* as we have a copy now, it is safe to decrease the TTL */ |
454 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
455 | bcast_packet->ttl--; |
456 | |
457 | skb_reset_mac_header(newskb); |
458 | |
459 | forw_packet->skb = newskb; |
460 | forw_packet->if_incoming = primary_if; |
461 | forw_packet->if_outgoing = NULL; |
462 | |
463 | /* how often did we send the bcast packet ? */ |
464 | forw_packet->num_packets = 0; |
465 | |
466 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
467 | batadv_send_outstanding_bcast_packet); |
468 | |
469 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
470 | return NETDEV_TX_OK; |
471 | |
472 | packet_free: |
473 | kfree(forw_packet); |
474 | out_and_inc: |
475 | atomic_inc(&bat_priv->bcast_queue_left); |
476 | out: |
477 | if (primary_if) |
478 | batadv_hardif_free_ref(primary_if); |
479 | return NETDEV_TX_BUSY; |
480 | } |
481 | |
482 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
483 | { |
484 | struct batadv_hard_iface *hard_iface; |
485 | struct delayed_work *delayed_work; |
486 | struct batadv_forw_packet *forw_packet; |
487 | struct sk_buff *skb1; |
488 | struct net_device *soft_iface; |
489 | struct batadv_priv *bat_priv; |
490 | |
491 | delayed_work = container_of(work, struct delayed_work, work); |
492 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
493 | delayed_work); |
494 | soft_iface = forw_packet->if_incoming->soft_iface; |
495 | bat_priv = netdev_priv(soft_iface); |
496 | |
497 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
498 | hlist_del(&forw_packet->list); |
499 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
500 | |
501 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
502 | goto out; |
503 | |
504 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
505 | goto out; |
506 | |
507 | /* rebroadcast packet */ |
508 | rcu_read_lock(); |
509 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
510 | if (hard_iface->soft_iface != soft_iface) |
511 | continue; |
512 | |
513 | if (forw_packet->num_packets >= hard_iface->num_bcasts) |
514 | continue; |
515 | |
516 | /* send a copy of the saved skb */ |
517 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); |
518 | if (skb1) |
519 | batadv_send_skb_packet(skb1, hard_iface, |
520 | batadv_broadcast_addr); |
521 | } |
522 | rcu_read_unlock(); |
523 | |
524 | forw_packet->num_packets++; |
525 | |
526 | /* if we still have some more bcasts to send */ |
527 | if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { |
528 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
529 | msecs_to_jiffies(5)); |
530 | return; |
531 | } |
532 | |
533 | out: |
534 | batadv_forw_packet_free(forw_packet); |
535 | atomic_inc(&bat_priv->bcast_queue_left); |
536 | } |
537 | |
538 | void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
539 | { |
540 | struct delayed_work *delayed_work; |
541 | struct batadv_forw_packet *forw_packet; |
542 | struct batadv_priv *bat_priv; |
543 | |
544 | delayed_work = container_of(work, struct delayed_work, work); |
545 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
546 | delayed_work); |
547 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
548 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
549 | hlist_del(&forw_packet->list); |
550 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
551 | |
552 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
553 | goto out; |
554 | |
555 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
556 | |
557 | /* we have to have at least one packet in the queue to determine the |
558 | * queues wake up time unless we are shutting down. |
559 | * |
560 | * only re-schedule if this is the "original" copy, e.g. the OGM of the |
561 | * primary interface should only be rescheduled once per period, but |
562 | * this function will be called for the forw_packet instances of the |
563 | * other secondary interfaces as well. |
564 | */ |
565 | if (forw_packet->own && |
566 | forw_packet->if_incoming == forw_packet->if_outgoing) |
567 | batadv_schedule_bat_ogm(forw_packet->if_incoming); |
568 | |
569 | out: |
570 | /* don't count own packet */ |
571 | if (!forw_packet->own) |
572 | atomic_inc(&bat_priv->batman_queue_left); |
573 | |
574 | batadv_forw_packet_free(forw_packet); |
575 | } |
576 | |
577 | void |
578 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, |
579 | const struct batadv_hard_iface *hard_iface) |
580 | { |
581 | struct batadv_forw_packet *forw_packet; |
582 | struct hlist_node *safe_tmp_node; |
583 | bool pending; |
584 | |
585 | if (hard_iface) |
586 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
587 | "purge_outstanding_packets(): %s\n", |
588 | hard_iface->net_dev->name); |
589 | else |
590 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
591 | "purge_outstanding_packets()\n"); |
592 | |
593 | /* free bcast list */ |
594 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
595 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
596 | &bat_priv->forw_bcast_list, list) { |
597 | /* if purge_outstanding_packets() was called with an argument |
598 | * we delete only packets belonging to the given interface |
599 | */ |
600 | if ((hard_iface) && |
601 | (forw_packet->if_incoming != hard_iface)) |
602 | continue; |
603 | |
604 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
605 | |
606 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
607 | * delete the item from the list |
608 | */ |
609 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
610 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
611 | |
612 | if (pending) { |
613 | hlist_del(&forw_packet->list); |
614 | batadv_forw_packet_free(forw_packet); |
615 | } |
616 | } |
617 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
618 | |
619 | /* free batman packet list */ |
620 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
621 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
622 | &bat_priv->forw_bat_list, list) { |
623 | /* if purge_outstanding_packets() was called with an argument |
624 | * we delete only packets belonging to the given interface |
625 | */ |
626 | if ((hard_iface) && |
627 | (forw_packet->if_incoming != hard_iface) && |
628 | (forw_packet->if_outgoing != hard_iface)) |
629 | continue; |
630 | |
631 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
632 | |
633 | /* send_outstanding_bat_packet() will lock the list to |
634 | * delete the item from the list |
635 | */ |
636 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
637 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
638 | |
639 | if (pending) { |
640 | hlist_del(&forw_packet->list); |
641 | batadv_forw_packet_free(forw_packet); |
642 | } |
643 | } |
644 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
645 | } |
646 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9