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1 | /* Copyright (C) 2007-2013 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, write to the Free Software |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301, USA |
18 | */ |
19 | |
20 | #include "main.h" |
21 | #include "distributed-arp-table.h" |
22 | #include "send.h" |
23 | #include "routing.h" |
24 | #include "translation-table.h" |
25 | #include "soft-interface.h" |
26 | #include "hard-interface.h" |
27 | #include "gateway_common.h" |
28 | #include "gateway_client.h" |
29 | #include "originator.h" |
30 | #include "network-coding.h" |
31 | #include "fragmentation.h" |
32 | |
33 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work); |
34 | |
35 | /* send out an already prepared packet to the given address via the |
36 | * specified batman interface |
37 | */ |
38 | int batadv_send_skb_packet(struct sk_buff *skb, |
39 | struct batadv_hard_iface *hard_iface, |
40 | const uint8_t *dst_addr) |
41 | { |
42 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
43 | struct ethhdr *ethhdr; |
44 | |
45 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
46 | goto send_skb_err; |
47 | |
48 | if (unlikely(!hard_iface->net_dev)) |
49 | goto send_skb_err; |
50 | |
51 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
52 | pr_warn("Interface %s is not up - can't send packet via that interface!\n", |
53 | hard_iface->net_dev->name); |
54 | goto send_skb_err; |
55 | } |
56 | |
57 | /* push to the ethernet header. */ |
58 | if (batadv_skb_head_push(skb, ETH_HLEN) < 0) |
59 | goto send_skb_err; |
60 | |
61 | skb_reset_mac_header(skb); |
62 | |
63 | ethhdr = eth_hdr(skb); |
64 | memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN); |
65 | memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); |
66 | ethhdr->h_proto = htons(ETH_P_BATMAN); |
67 | |
68 | skb_set_network_header(skb, ETH_HLEN); |
69 | skb->protocol = htons(ETH_P_BATMAN); |
70 | |
71 | skb->dev = hard_iface->net_dev; |
72 | |
73 | /* Save a clone of the skb to use when decoding coded packets */ |
74 | batadv_nc_skb_store_for_decoding(bat_priv, skb); |
75 | |
76 | /* dev_queue_xmit() returns a negative result on error. However on |
77 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP |
78 | * (which is > 0). This will not be treated as an error. |
79 | */ |
80 | return dev_queue_xmit(skb); |
81 | send_skb_err: |
82 | kfree_skb(skb); |
83 | return NET_XMIT_DROP; |
84 | } |
85 | |
86 | /** |
87 | * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. |
88 | * @skb: Packet to be transmitted. |
89 | * @orig_node: Final destination of the packet. |
90 | * @recv_if: Interface used when receiving the packet (can be NULL). |
91 | * |
92 | * Looks up the best next-hop towards the passed originator and passes the |
93 | * skb on for preparation of MAC header. If the packet originated from this |
94 | * host, NULL can be passed as recv_if and no interface alternating is |
95 | * attempted. |
96 | * |
97 | * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or |
98 | * NET_XMIT_POLICED if the skb is buffered for later transmit. |
99 | */ |
100 | int batadv_send_skb_to_orig(struct sk_buff *skb, |
101 | struct batadv_orig_node *orig_node, |
102 | struct batadv_hard_iface *recv_if) |
103 | { |
104 | struct batadv_priv *bat_priv = orig_node->bat_priv; |
105 | struct batadv_neigh_node *neigh_node; |
106 | int ret = NET_XMIT_DROP; |
107 | |
108 | /* batadv_find_router() increases neigh_nodes refcount if found. */ |
109 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
110 | if (!neigh_node) |
111 | goto out; |
112 | |
113 | /* Check if the skb is too large to send in one piece and fragment |
114 | * it if needed. |
115 | */ |
116 | if (atomic_read(&bat_priv->fragmentation) && |
117 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
118 | /* Fragment and send packet. */ |
119 | if (batadv_frag_send_packet(skb, orig_node, neigh_node)) |
120 | ret = NET_XMIT_SUCCESS; |
121 | |
122 | goto out; |
123 | } |
124 | |
125 | /* try to network code the packet, if it is received on an interface |
126 | * (i.e. being forwarded). If the packet originates from this node or if |
127 | * network coding fails, then send the packet as usual. |
128 | */ |
129 | if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { |
130 | ret = NET_XMIT_POLICED; |
131 | } else { |
132 | batadv_send_skb_packet(skb, neigh_node->if_incoming, |
133 | neigh_node->addr); |
134 | ret = NET_XMIT_SUCCESS; |
135 | } |
136 | |
137 | out: |
138 | if (neigh_node) |
139 | batadv_neigh_node_free_ref(neigh_node); |
140 | |
141 | return ret; |
142 | } |
143 | |
144 | /** |
145 | * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the |
146 | * common fields for unicast packets |
147 | * @skb: the skb carrying the unicast header to initialize |
148 | * @hdr_size: amount of bytes to push at the beginning of the skb |
149 | * @orig_node: the destination node |
150 | * |
151 | * Returns false if the buffer extension was not possible or true otherwise. |
152 | */ |
153 | static bool |
154 | batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, |
155 | struct batadv_orig_node *orig_node) |
156 | { |
157 | struct batadv_unicast_packet *unicast_packet; |
158 | uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); |
159 | |
160 | if (batadv_skb_head_push(skb, hdr_size) < 0) |
161 | return false; |
162 | |
163 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
164 | unicast_packet->version = BATADV_COMPAT_VERSION; |
165 | /* batman packet type: unicast */ |
166 | unicast_packet->packet_type = BATADV_UNICAST; |
167 | /* set unicast ttl */ |
168 | unicast_packet->ttl = BATADV_TTL; |
169 | /* copy the destination for faster routing */ |
170 | memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); |
171 | /* set the destination tt version number */ |
172 | unicast_packet->ttvn = ttvn; |
173 | |
174 | return true; |
175 | } |
176 | |
177 | /** |
178 | * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header |
179 | * @skb: the skb containing the payload to encapsulate |
180 | * @orig_node: the destination node |
181 | * |
182 | * Returns false if the payload could not be encapsulated or true otherwise. |
183 | */ |
184 | static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, |
185 | struct batadv_orig_node *orig_node) |
186 | { |
187 | size_t uni_size = sizeof(struct batadv_unicast_packet); |
188 | |
189 | return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); |
190 | } |
191 | |
192 | /** |
193 | * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a |
194 | * unicast 4addr header |
195 | * @bat_priv: the bat priv with all the soft interface information |
196 | * @skb: the skb containing the payload to encapsulate |
197 | * @orig_node: the destination node |
198 | * @packet_subtype: the unicast 4addr packet subtype to use |
199 | * |
200 | * Returns false if the payload could not be encapsulated or true otherwise. |
201 | */ |
202 | bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, |
203 | struct sk_buff *skb, |
204 | struct batadv_orig_node *orig, |
205 | int packet_subtype) |
206 | { |
207 | struct batadv_hard_iface *primary_if; |
208 | struct batadv_unicast_4addr_packet *uc_4addr_packet; |
209 | bool ret = false; |
210 | |
211 | primary_if = batadv_primary_if_get_selected(bat_priv); |
212 | if (!primary_if) |
213 | goto out; |
214 | |
215 | /* Pull the header space and fill the unicast_packet substructure. |
216 | * We can do that because the first member of the uc_4addr_packet |
217 | * is of type struct unicast_packet |
218 | */ |
219 | if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), |
220 | orig)) |
221 | goto out; |
222 | |
223 | uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
224 | uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; |
225 | memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); |
226 | uc_4addr_packet->subtype = packet_subtype; |
227 | uc_4addr_packet->reserved = 0; |
228 | |
229 | ret = true; |
230 | out: |
231 | if (primary_if) |
232 | batadv_hardif_free_ref(primary_if); |
233 | return ret; |
234 | } |
235 | |
236 | /** |
237 | * batadv_send_skb_unicast - encapsulate and send an skb via unicast |
238 | * @bat_priv: the bat priv with all the soft interface information |
239 | * @skb: payload to send |
240 | * @packet_type: the batman unicast packet type to use |
241 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast |
242 | * 4addr packets) |
243 | * @orig_node: the originator to send the packet to |
244 | * @vid: the vid to be used to search the translation table |
245 | * |
246 | * Wrap the given skb into a batman-adv unicast or unicast-4addr header |
247 | * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied |
248 | * as packet_type. Then send this frame to the given orig_node and release a |
249 | * reference to this orig_node. |
250 | * |
251 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
252 | */ |
253 | static int batadv_send_skb_unicast(struct batadv_priv *bat_priv, |
254 | struct sk_buff *skb, int packet_type, |
255 | int packet_subtype, |
256 | struct batadv_orig_node *orig_node, |
257 | unsigned short vid) |
258 | { |
259 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
260 | struct batadv_unicast_packet *unicast_packet; |
261 | int ret = NET_XMIT_DROP; |
262 | |
263 | if (!orig_node) |
264 | goto out; |
265 | |
266 | switch (packet_type) { |
267 | case BATADV_UNICAST: |
268 | if (!batadv_send_skb_prepare_unicast(skb, orig_node)) |
269 | goto out; |
270 | break; |
271 | case BATADV_UNICAST_4ADDR: |
272 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, |
273 | orig_node, |
274 | packet_subtype)) |
275 | goto out; |
276 | break; |
277 | default: |
278 | /* this function supports UNICAST and UNICAST_4ADDR only. It |
279 | * should never be invoked with any other packet type |
280 | */ |
281 | goto out; |
282 | } |
283 | |
284 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
285 | |
286 | /* inform the destination node that we are still missing a correct route |
287 | * for this client. The destination will receive this packet and will |
288 | * try to reroute it because the ttvn contained in the header is less |
289 | * than the current one |
290 | */ |
291 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) |
292 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
293 | |
294 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
295 | ret = NET_XMIT_SUCCESS; |
296 | |
297 | out: |
298 | if (orig_node) |
299 | batadv_orig_node_free_ref(orig_node); |
300 | if (ret == NET_XMIT_DROP) |
301 | kfree_skb(skb); |
302 | return ret; |
303 | } |
304 | |
305 | /** |
306 | * batadv_send_skb_via_tt_generic - send an skb via TT lookup |
307 | * @bat_priv: the bat priv with all the soft interface information |
308 | * @skb: payload to send |
309 | * @packet_type: the batman unicast packet type to use |
310 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast |
311 | * 4addr packets) |
312 | * @vid: the vid to be used to search the translation table |
313 | * |
314 | * Look up the recipient node for the destination address in the ethernet |
315 | * header via the translation table. Wrap the given skb into a batman-adv |
316 | * unicast or unicast-4addr header depending on whether BATADV_UNICAST or |
317 | * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame |
318 | * to the according destination node. |
319 | * |
320 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
321 | */ |
322 | int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, |
323 | struct sk_buff *skb, int packet_type, |
324 | int packet_subtype, unsigned short vid) |
325 | { |
326 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
327 | struct batadv_orig_node *orig_node; |
328 | |
329 | orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
330 | ethhdr->h_dest, vid); |
331 | return batadv_send_skb_unicast(bat_priv, skb, packet_type, |
332 | packet_subtype, orig_node, vid); |
333 | } |
334 | |
335 | /** |
336 | * batadv_send_skb_via_gw - send an skb via gateway lookup |
337 | * @bat_priv: the bat priv with all the soft interface information |
338 | * @skb: payload to send |
339 | * @vid: the vid to be used to search the translation table |
340 | * |
341 | * Look up the currently selected gateway. Wrap the given skb into a batman-adv |
342 | * unicast header and send this frame to this gateway node. |
343 | * |
344 | * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
345 | */ |
346 | int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, |
347 | unsigned short vid) |
348 | { |
349 | struct batadv_orig_node *orig_node; |
350 | |
351 | orig_node = batadv_gw_get_selected_orig(bat_priv); |
352 | return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, |
353 | orig_node, vid); |
354 | } |
355 | |
356 | void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) |
357 | { |
358 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
359 | |
360 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || |
361 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) |
362 | return; |
363 | |
364 | /* the interface gets activated here to avoid race conditions between |
365 | * the moment of activating the interface in |
366 | * hardif_activate_interface() where the originator mac is set and |
367 | * outdated packets (especially uninitialized mac addresses) in the |
368 | * packet queue |
369 | */ |
370 | if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
371 | hard_iface->if_status = BATADV_IF_ACTIVE; |
372 | |
373 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); |
374 | } |
375 | |
376 | static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
377 | { |
378 | if (forw_packet->skb) |
379 | kfree_skb(forw_packet->skb); |
380 | if (forw_packet->if_incoming) |
381 | batadv_hardif_free_ref(forw_packet->if_incoming); |
382 | kfree(forw_packet); |
383 | } |
384 | |
385 | static void |
386 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
387 | struct batadv_forw_packet *forw_packet, |
388 | unsigned long send_time) |
389 | { |
390 | /* add new packet to packet list */ |
391 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
392 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); |
393 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
394 | |
395 | /* start timer for this packet */ |
396 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
397 | send_time); |
398 | } |
399 | |
400 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
401 | * are sent multiple times to increase probability for being received. |
402 | * |
403 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on |
404 | * errors. |
405 | * |
406 | * The skb is not consumed, so the caller should make sure that the |
407 | * skb is freed. |
408 | */ |
409 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
410 | const struct sk_buff *skb, |
411 | unsigned long delay) |
412 | { |
413 | struct batadv_hard_iface *primary_if = NULL; |
414 | struct batadv_forw_packet *forw_packet; |
415 | struct batadv_bcast_packet *bcast_packet; |
416 | struct sk_buff *newskb; |
417 | |
418 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
419 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
420 | "bcast packet queue full\n"); |
421 | goto out; |
422 | } |
423 | |
424 | primary_if = batadv_primary_if_get_selected(bat_priv); |
425 | if (!primary_if) |
426 | goto out_and_inc; |
427 | |
428 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
429 | |
430 | if (!forw_packet) |
431 | goto out_and_inc; |
432 | |
433 | newskb = skb_copy(skb, GFP_ATOMIC); |
434 | if (!newskb) |
435 | goto packet_free; |
436 | |
437 | /* as we have a copy now, it is safe to decrease the TTL */ |
438 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
439 | bcast_packet->ttl--; |
440 | |
441 | skb_reset_mac_header(newskb); |
442 | |
443 | forw_packet->skb = newskb; |
444 | forw_packet->if_incoming = primary_if; |
445 | |
446 | /* how often did we send the bcast packet ? */ |
447 | forw_packet->num_packets = 0; |
448 | |
449 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
450 | batadv_send_outstanding_bcast_packet); |
451 | |
452 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
453 | return NETDEV_TX_OK; |
454 | |
455 | packet_free: |
456 | kfree(forw_packet); |
457 | out_and_inc: |
458 | atomic_inc(&bat_priv->bcast_queue_left); |
459 | out: |
460 | if (primary_if) |
461 | batadv_hardif_free_ref(primary_if); |
462 | return NETDEV_TX_BUSY; |
463 | } |
464 | |
465 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
466 | { |
467 | struct batadv_hard_iface *hard_iface; |
468 | struct delayed_work *delayed_work; |
469 | struct batadv_forw_packet *forw_packet; |
470 | struct sk_buff *skb1; |
471 | struct net_device *soft_iface; |
472 | struct batadv_priv *bat_priv; |
473 | |
474 | delayed_work = container_of(work, struct delayed_work, work); |
475 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
476 | delayed_work); |
477 | soft_iface = forw_packet->if_incoming->soft_iface; |
478 | bat_priv = netdev_priv(soft_iface); |
479 | |
480 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
481 | hlist_del(&forw_packet->list); |
482 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
483 | |
484 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
485 | goto out; |
486 | |
487 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
488 | goto out; |
489 | |
490 | /* rebroadcast packet */ |
491 | rcu_read_lock(); |
492 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
493 | if (hard_iface->soft_iface != soft_iface) |
494 | continue; |
495 | |
496 | if (forw_packet->num_packets >= hard_iface->num_bcasts) |
497 | continue; |
498 | |
499 | /* send a copy of the saved skb */ |
500 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); |
501 | if (skb1) |
502 | batadv_send_skb_packet(skb1, hard_iface, |
503 | batadv_broadcast_addr); |
504 | } |
505 | rcu_read_unlock(); |
506 | |
507 | forw_packet->num_packets++; |
508 | |
509 | /* if we still have some more bcasts to send */ |
510 | if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { |
511 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
512 | msecs_to_jiffies(5)); |
513 | return; |
514 | } |
515 | |
516 | out: |
517 | batadv_forw_packet_free(forw_packet); |
518 | atomic_inc(&bat_priv->bcast_queue_left); |
519 | } |
520 | |
521 | void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
522 | { |
523 | struct delayed_work *delayed_work; |
524 | struct batadv_forw_packet *forw_packet; |
525 | struct batadv_priv *bat_priv; |
526 | |
527 | delayed_work = container_of(work, struct delayed_work, work); |
528 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
529 | delayed_work); |
530 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
531 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
532 | hlist_del(&forw_packet->list); |
533 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
534 | |
535 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
536 | goto out; |
537 | |
538 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
539 | |
540 | /* we have to have at least one packet in the queue |
541 | * to determine the queues wake up time unless we are |
542 | * shutting down |
543 | */ |
544 | if (forw_packet->own) |
545 | batadv_schedule_bat_ogm(forw_packet->if_incoming); |
546 | |
547 | out: |
548 | /* don't count own packet */ |
549 | if (!forw_packet->own) |
550 | atomic_inc(&bat_priv->batman_queue_left); |
551 | |
552 | batadv_forw_packet_free(forw_packet); |
553 | } |
554 | |
555 | void |
556 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, |
557 | const struct batadv_hard_iface *hard_iface) |
558 | { |
559 | struct batadv_forw_packet *forw_packet; |
560 | struct hlist_node *safe_tmp_node; |
561 | bool pending; |
562 | |
563 | if (hard_iface) |
564 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
565 | "purge_outstanding_packets(): %s\n", |
566 | hard_iface->net_dev->name); |
567 | else |
568 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
569 | "purge_outstanding_packets()\n"); |
570 | |
571 | /* free bcast list */ |
572 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
573 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
574 | &bat_priv->forw_bcast_list, list) { |
575 | /* if purge_outstanding_packets() was called with an argument |
576 | * we delete only packets belonging to the given interface |
577 | */ |
578 | if ((hard_iface) && |
579 | (forw_packet->if_incoming != hard_iface)) |
580 | continue; |
581 | |
582 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
583 | |
584 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
585 | * delete the item from the list |
586 | */ |
587 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
588 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
589 | |
590 | if (pending) { |
591 | hlist_del(&forw_packet->list); |
592 | batadv_forw_packet_free(forw_packet); |
593 | } |
594 | } |
595 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); |
596 | |
597 | /* free batman packet list */ |
598 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
599 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
600 | &bat_priv->forw_bat_list, list) { |
601 | /* if purge_outstanding_packets() was called with an argument |
602 | * we delete only packets belonging to the given interface |
603 | */ |
604 | if ((hard_iface) && |
605 | (forw_packet->if_incoming != hard_iface)) |
606 | continue; |
607 | |
608 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
609 | |
610 | /* send_outstanding_bat_packet() will lock the list to |
611 | * delete the item from the list |
612 | */ |
613 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
614 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
615 | |
616 | if (pending) { |
617 | hlist_del(&forw_packet->list); |
618 | batadv_forw_packet_free(forw_packet); |
619 | } |
620 | } |
621 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
622 | } |
623 |
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