Commit | Line | Data |
---|---|---|
0046b040 | 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
1e2c2a4f | 18 | #include "send.h" |
c6c8fea2 | 19 | #include "main.h" |
1e2c2a4f SE |
20 | |
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/etherdevice.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/if_ether.h> | |
26 | #include <linux/if.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/kernel.h> | |
27353446 | 29 | #include <linux/kref.h> |
1e2c2a4f SE |
30 | #include <linux/list.h> |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/printk.h> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/rcupdate.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/spinlock.h> | |
38 | #include <linux/stddef.h> | |
39 | #include <linux/workqueue.h> | |
40 | ||
c384ea3e | 41 | #include "distributed-arp-table.h" |
1e2c2a4f | 42 | #include "fragmentation.h" |
f097e25d | 43 | #include "gateway_client.h" |
1e2c2a4f | 44 | #include "hard-interface.h" |
612d2b4f | 45 | #include "network-coding.h" |
1e2c2a4f SE |
46 | #include "originator.h" |
47 | #include "routing.h" | |
48 | #include "soft-interface.h" | |
49 | #include "translation-table.h" | |
af5d4f77 | 50 | |
bb079c82 | 51 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work); |
c6c8fea2 | 52 | |
95d39278 AQ |
53 | /** |
54 | * batadv_send_skb_packet - send an already prepared packet | |
55 | * @skb: the packet to send | |
56 | * @hard_iface: the interface to use to send the broadcast packet | |
57 | * @dst_addr: the payload destination | |
58 | * | |
59 | * Send out an already prepared packet to the given neighbor or broadcast it | |
60 | * using the specified interface. Either hard_iface or neigh_node must be not | |
61 | * NULL. | |
62 | * If neigh_node is NULL, then the packet is broadcasted using hard_iface, | |
63 | * otherwise it is sent as unicast to the given neighbor. | |
64 | * | |
65 | * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb) | |
66 | * otherwise | |
9cfc7bd6 | 67 | */ |
56303d34 SE |
68 | int batadv_send_skb_packet(struct sk_buff *skb, |
69 | struct batadv_hard_iface *hard_iface, | |
6b5e971a | 70 | const u8 *dst_addr) |
c6c8fea2 | 71 | { |
95d39278 | 72 | struct batadv_priv *bat_priv; |
c6c8fea2 SE |
73 | struct ethhdr *ethhdr; |
74 | ||
95d39278 AQ |
75 | bat_priv = netdev_priv(hard_iface->soft_iface); |
76 | ||
e9a4f295 | 77 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
78 | goto send_skb_err; |
79 | ||
e6c10f43 | 80 | if (unlikely(!hard_iface->net_dev)) |
c6c8fea2 SE |
81 | goto send_skb_err; |
82 | ||
e6c10f43 | 83 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
67969581 SE |
84 | pr_warn("Interface %s is not up - can't send packet via that interface!\n", |
85 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
86 | goto send_skb_err; |
87 | } | |
88 | ||
89 | /* push to the ethernet header. */ | |
04b482a2 | 90 | if (batadv_skb_head_push(skb, ETH_HLEN) < 0) |
c6c8fea2 SE |
91 | goto send_skb_err; |
92 | ||
93 | skb_reset_mac_header(skb); | |
94 | ||
7ed4be95 | 95 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
96 | ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); |
97 | ether_addr_copy(ethhdr->h_dest, dst_addr); | |
293e9338 | 98 | ethhdr->h_proto = htons(ETH_P_BATMAN); |
c6c8fea2 SE |
99 | |
100 | skb_set_network_header(skb, ETH_HLEN); | |
293e9338 | 101 | skb->protocol = htons(ETH_P_BATMAN); |
c6c8fea2 | 102 | |
e6c10f43 | 103 | skb->dev = hard_iface->net_dev; |
c6c8fea2 | 104 | |
612d2b4f MH |
105 | /* Save a clone of the skb to use when decoding coded packets */ |
106 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
107 | ||
c6c8fea2 SE |
108 | /* dev_queue_xmit() returns a negative result on error. However on |
109 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP | |
9cfc7bd6 SE |
110 | * (which is > 0). This will not be treated as an error. |
111 | */ | |
c6c8fea2 SE |
112 | return dev_queue_xmit(skb); |
113 | send_skb_err: | |
114 | kfree_skb(skb); | |
115 | return NET_XMIT_DROP; | |
116 | } | |
117 | ||
95d39278 AQ |
118 | int batadv_send_broadcast_skb(struct sk_buff *skb, |
119 | struct batadv_hard_iface *hard_iface) | |
120 | { | |
121 | return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); | |
122 | } | |
123 | ||
124 | int batadv_send_unicast_skb(struct sk_buff *skb, | |
125 | struct batadv_neigh_node *neigh) | |
126 | { | |
127 | #ifdef CONFIG_BATMAN_ADV_BATMAN_V | |
128 | struct batadv_hardif_neigh_node *hardif_neigh; | |
129 | #endif | |
130 | int ret; | |
131 | ||
132 | ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr); | |
133 | ||
134 | #ifdef CONFIG_BATMAN_ADV_BATMAN_V | |
135 | hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr); | |
136 | ||
137 | if ((hardif_neigh) && (ret != NET_XMIT_DROP)) | |
138 | hardif_neigh->bat_v.last_unicast_tx = jiffies; | |
139 | ||
140 | if (hardif_neigh) | |
141 | batadv_hardif_neigh_put(hardif_neigh); | |
142 | #endif | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
bb351ba0 MH |
147 | /** |
148 | * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. | |
149 | * @skb: Packet to be transmitted. | |
150 | * @orig_node: Final destination of the packet. | |
151 | * @recv_if: Interface used when receiving the packet (can be NULL). | |
152 | * | |
153 | * Looks up the best next-hop towards the passed originator and passes the | |
154 | * skb on for preparation of MAC header. If the packet originated from this | |
155 | * host, NULL can be passed as recv_if and no interface alternating is | |
156 | * attempted. | |
157 | * | |
62fe710f | 158 | * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or |
e91ecfc6 | 159 | * NET_XMIT_POLICED if the skb is buffered for later transmit. |
bb351ba0 | 160 | */ |
e91ecfc6 MH |
161 | int batadv_send_skb_to_orig(struct sk_buff *skb, |
162 | struct batadv_orig_node *orig_node, | |
163 | struct batadv_hard_iface *recv_if) | |
bb351ba0 MH |
164 | { |
165 | struct batadv_priv *bat_priv = orig_node->bat_priv; | |
166 | struct batadv_neigh_node *neigh_node; | |
e91ecfc6 | 167 | int ret = NET_XMIT_DROP; |
bb351ba0 MH |
168 | |
169 | /* batadv_find_router() increases neigh_nodes refcount if found. */ | |
170 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); | |
171 | if (!neigh_node) | |
ee75ed88 MH |
172 | goto out; |
173 | ||
174 | /* Check if the skb is too large to send in one piece and fragment | |
175 | * it if needed. | |
176 | */ | |
177 | if (atomic_read(&bat_priv->fragmentation) && | |
178 | skb->len > neigh_node->if_incoming->net_dev->mtu) { | |
179 | /* Fragment and send packet. */ | |
180 | if (batadv_frag_send_packet(skb, orig_node, neigh_node)) | |
181 | ret = NET_XMIT_SUCCESS; | |
182 | ||
183 | goto out; | |
184 | } | |
bb351ba0 | 185 | |
e91ecfc6 MH |
186 | /* try to network code the packet, if it is received on an interface |
187 | * (i.e. being forwarded). If the packet originates from this node or if | |
188 | * network coding fails, then send the packet as usual. | |
189 | */ | |
190 | if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { | |
191 | ret = NET_XMIT_POLICED; | |
192 | } else { | |
95d39278 | 193 | batadv_send_unicast_skb(skb, neigh_node); |
e91ecfc6 MH |
194 | ret = NET_XMIT_SUCCESS; |
195 | } | |
bb351ba0 | 196 | |
ee75ed88 MH |
197 | out: |
198 | if (neigh_node) | |
25bb2509 | 199 | batadv_neigh_node_put(neigh_node); |
bb351ba0 | 200 | |
e91ecfc6 | 201 | return ret; |
bb351ba0 MH |
202 | } |
203 | ||
f097e25d MH |
204 | /** |
205 | * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the | |
206 | * common fields for unicast packets | |
207 | * @skb: the skb carrying the unicast header to initialize | |
208 | * @hdr_size: amount of bytes to push at the beginning of the skb | |
209 | * @orig_node: the destination node | |
210 | * | |
62fe710f | 211 | * Return: false if the buffer extension was not possible or true otherwise. |
f097e25d MH |
212 | */ |
213 | static bool | |
214 | batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, | |
215 | struct batadv_orig_node *orig_node) | |
216 | { | |
217 | struct batadv_unicast_packet *unicast_packet; | |
6b5e971a | 218 | u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
f097e25d MH |
219 | |
220 | if (batadv_skb_head_push(skb, hdr_size) < 0) | |
221 | return false; | |
222 | ||
223 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 | 224 | unicast_packet->version = BATADV_COMPAT_VERSION; |
f097e25d | 225 | /* batman packet type: unicast */ |
a40d9b07 | 226 | unicast_packet->packet_type = BATADV_UNICAST; |
f097e25d | 227 | /* set unicast ttl */ |
a40d9b07 | 228 | unicast_packet->ttl = BATADV_TTL; |
f097e25d | 229 | /* copy the destination for faster routing */ |
8fdd0153 | 230 | ether_addr_copy(unicast_packet->dest, orig_node->orig); |
f097e25d MH |
231 | /* set the destination tt version number */ |
232 | unicast_packet->ttvn = ttvn; | |
233 | ||
234 | return true; | |
235 | } | |
236 | ||
237 | /** | |
238 | * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header | |
239 | * @skb: the skb containing the payload to encapsulate | |
240 | * @orig_node: the destination node | |
241 | * | |
62fe710f | 242 | * Return: false if the payload could not be encapsulated or true otherwise. |
f097e25d MH |
243 | */ |
244 | static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, | |
245 | struct batadv_orig_node *orig_node) | |
246 | { | |
247 | size_t uni_size = sizeof(struct batadv_unicast_packet); | |
248 | ||
249 | return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); | |
250 | } | |
251 | ||
252 | /** | |
253 | * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a | |
254 | * unicast 4addr header | |
255 | * @bat_priv: the bat priv with all the soft interface information | |
256 | * @skb: the skb containing the payload to encapsulate | |
e51f0397 | 257 | * @orig: the destination node |
f097e25d MH |
258 | * @packet_subtype: the unicast 4addr packet subtype to use |
259 | * | |
62fe710f | 260 | * Return: false if the payload could not be encapsulated or true otherwise. |
f097e25d MH |
261 | */ |
262 | bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, | |
263 | struct sk_buff *skb, | |
264 | struct batadv_orig_node *orig, | |
265 | int packet_subtype) | |
266 | { | |
267 | struct batadv_hard_iface *primary_if; | |
268 | struct batadv_unicast_4addr_packet *uc_4addr_packet; | |
269 | bool ret = false; | |
270 | ||
271 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
272 | if (!primary_if) | |
273 | goto out; | |
274 | ||
275 | /* Pull the header space and fill the unicast_packet substructure. | |
276 | * We can do that because the first member of the uc_4addr_packet | |
277 | * is of type struct unicast_packet | |
278 | */ | |
279 | if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), | |
280 | orig)) | |
281 | goto out; | |
282 | ||
283 | uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; | |
a40d9b07 | 284 | uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; |
8fdd0153 | 285 | ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); |
f097e25d MH |
286 | uc_4addr_packet->subtype = packet_subtype; |
287 | uc_4addr_packet->reserved = 0; | |
288 | ||
289 | ret = true; | |
290 | out: | |
291 | if (primary_if) | |
82047ad7 | 292 | batadv_hardif_put(primary_if); |
f097e25d MH |
293 | return ret; |
294 | } | |
295 | ||
296 | /** | |
e300d314 | 297 | * batadv_send_skb_unicast - encapsulate and send an skb via unicast |
f097e25d MH |
298 | * @bat_priv: the bat priv with all the soft interface information |
299 | * @skb: payload to send | |
300 | * @packet_type: the batman unicast packet type to use | |
301 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast | |
302 | * 4addr packets) | |
e300d314 | 303 | * @orig_node: the originator to send the packet to |
c018ad3d | 304 | * @vid: the vid to be used to search the translation table |
f097e25d | 305 | * |
e300d314 LL |
306 | * Wrap the given skb into a batman-adv unicast or unicast-4addr header |
307 | * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied | |
308 | * as packet_type. Then send this frame to the given orig_node and release a | |
309 | * reference to this orig_node. | |
310 | * | |
62fe710f | 311 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
f097e25d | 312 | */ |
1d8ab8d3 LL |
313 | int batadv_send_skb_unicast(struct batadv_priv *bat_priv, |
314 | struct sk_buff *skb, int packet_type, | |
315 | int packet_subtype, | |
316 | struct batadv_orig_node *orig_node, | |
317 | unsigned short vid) | |
f097e25d | 318 | { |
f097e25d | 319 | struct batadv_unicast_packet *unicast_packet; |
8ea64e27 | 320 | struct ethhdr *ethhdr; |
927c2ed7 | 321 | int ret = NET_XMIT_DROP; |
f097e25d | 322 | |
56a5ca84 | 323 | if (!orig_node) |
f097e25d MH |
324 | goto out; |
325 | ||
326 | switch (packet_type) { | |
327 | case BATADV_UNICAST: | |
33faa045 AQ |
328 | if (!batadv_send_skb_prepare_unicast(skb, orig_node)) |
329 | goto out; | |
f097e25d MH |
330 | break; |
331 | case BATADV_UNICAST_4ADDR: | |
33faa045 AQ |
332 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, |
333 | orig_node, | |
334 | packet_subtype)) | |
335 | goto out; | |
f097e25d MH |
336 | break; |
337 | default: | |
338 | /* this function supports UNICAST and UNICAST_4ADDR only. It | |
339 | * should never be invoked with any other packet type | |
340 | */ | |
341 | goto out; | |
342 | } | |
343 | ||
927c2ed7 LL |
344 | /* skb->data might have been reallocated by |
345 | * batadv_send_skb_prepare_unicast{,_4addr}() | |
346 | */ | |
347 | ethhdr = eth_hdr(skb); | |
f097e25d MH |
348 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
349 | ||
350 | /* inform the destination node that we are still missing a correct route | |
351 | * for this client. The destination will receive this packet and will | |
352 | * try to reroute it because the ttvn contained in the header is less | |
353 | * than the current one | |
354 | */ | |
c018ad3d | 355 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) |
f097e25d MH |
356 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
357 | ||
358 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
e300d314 | 359 | ret = NET_XMIT_SUCCESS; |
f097e25d MH |
360 | |
361 | out: | |
f097e25d | 362 | if (orig_node) |
5d967310 | 363 | batadv_orig_node_put(orig_node); |
e300d314 | 364 | if (ret == NET_XMIT_DROP) |
f097e25d MH |
365 | kfree_skb(skb); |
366 | return ret; | |
367 | } | |
368 | ||
e300d314 LL |
369 | /** |
370 | * batadv_send_skb_via_tt_generic - send an skb via TT lookup | |
371 | * @bat_priv: the bat priv with all the soft interface information | |
372 | * @skb: payload to send | |
373 | * @packet_type: the batman unicast packet type to use | |
374 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast | |
375 | * 4addr packets) | |
c5d3a652 | 376 | * @dst_hint: can be used to override the destination contained in the skb |
e300d314 LL |
377 | * @vid: the vid to be used to search the translation table |
378 | * | |
379 | * Look up the recipient node for the destination address in the ethernet | |
380 | * header via the translation table. Wrap the given skb into a batman-adv | |
381 | * unicast or unicast-4addr header depending on whether BATADV_UNICAST or | |
382 | * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame | |
383 | * to the according destination node. | |
384 | * | |
62fe710f | 385 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
e300d314 LL |
386 | */ |
387 | int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, | |
388 | struct sk_buff *skb, int packet_type, | |
6b5e971a | 389 | int packet_subtype, u8 *dst_hint, |
6c413b1c | 390 | unsigned short vid) |
e300d314 LL |
391 | { |
392 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; | |
393 | struct batadv_orig_node *orig_node; | |
6b5e971a | 394 | u8 *src, *dst; |
6c413b1c AQ |
395 | |
396 | src = ethhdr->h_source; | |
397 | dst = ethhdr->h_dest; | |
398 | ||
399 | /* if we got an hint! let's send the packet to this client (if any) */ | |
400 | if (dst_hint) { | |
401 | src = NULL; | |
402 | dst = dst_hint; | |
403 | } | |
404 | orig_node = batadv_transtable_search(bat_priv, src, dst, vid); | |
e300d314 | 405 | |
e300d314 LL |
406 | return batadv_send_skb_unicast(bat_priv, skb, packet_type, |
407 | packet_subtype, orig_node, vid); | |
408 | } | |
409 | ||
410 | /** | |
411 | * batadv_send_skb_via_gw - send an skb via gateway lookup | |
412 | * @bat_priv: the bat priv with all the soft interface information | |
413 | * @skb: payload to send | |
414 | * @vid: the vid to be used to search the translation table | |
415 | * | |
416 | * Look up the currently selected gateway. Wrap the given skb into a batman-adv | |
417 | * unicast header and send this frame to this gateway node. | |
418 | * | |
62fe710f | 419 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
e300d314 LL |
420 | */ |
421 | int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
422 | unsigned short vid) | |
423 | { | |
424 | struct batadv_orig_node *orig_node; | |
425 | ||
426 | orig_node = batadv_gw_get_selected_orig(bat_priv); | |
427 | return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, | |
428 | orig_node, vid); | |
429 | } | |
430 | ||
56303d34 | 431 | void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 432 | { |
56303d34 | 433 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 434 | |
e9a4f295 SE |
435 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || |
436 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) | |
c6c8fea2 SE |
437 | return; |
438 | ||
9cfc7bd6 | 439 | /* the interface gets activated here to avoid race conditions between |
c6c8fea2 SE |
440 | * the moment of activating the interface in |
441 | * hardif_activate_interface() where the originator mac is set and | |
442 | * outdated packets (especially uninitialized mac addresses) in the | |
443 | * packet queue | |
444 | */ | |
e9a4f295 SE |
445 | if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
446 | hard_iface->if_status = BATADV_IF_ACTIVE; | |
c6c8fea2 | 447 | |
be9aa4c1 | 448 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); |
c6c8fea2 SE |
449 | } |
450 | ||
56303d34 | 451 | static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
c6c8fea2 | 452 | { |
c799443e | 453 | kfree_skb(forw_packet->skb); |
6d5808d4 | 454 | if (forw_packet->if_incoming) |
82047ad7 | 455 | batadv_hardif_put(forw_packet->if_incoming); |
ef0a937f | 456 | if (forw_packet->if_outgoing) |
82047ad7 | 457 | batadv_hardif_put(forw_packet->if_outgoing); |
c6c8fea2 SE |
458 | kfree(forw_packet); |
459 | } | |
460 | ||
56303d34 SE |
461 | static void |
462 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, | |
463 | struct batadv_forw_packet *forw_packet, | |
464 | unsigned long send_time) | |
c6c8fea2 | 465 | { |
c6c8fea2 SE |
466 | /* add new packet to packet list */ |
467 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
468 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); | |
469 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
470 | ||
471 | /* start timer for this packet */ | |
3193e8fd | 472 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
c6c8fea2 SE |
473 | send_time); |
474 | } | |
475 | ||
62fe710f | 476 | /** |
7afcbbef SE |
477 | * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends |
478 | * @bat_priv: the bat priv with all the soft interface information | |
479 | * @skb: broadcast packet to add | |
480 | * @delay: number of jiffies to wait before sending | |
c6c8fea2 | 481 | * |
62fe710f SE |
482 | * add a broadcast packet to the queue and setup timers. broadcast packets |
483 | * are sent multiple times to increase probability for being received. | |
c6c8fea2 SE |
484 | * |
485 | * The skb is not consumed, so the caller should make sure that the | |
9cfc7bd6 | 486 | * skb is freed. |
62fe710f SE |
487 | * |
488 | * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. | |
9cfc7bd6 | 489 | */ |
56303d34 | 490 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
9455e34c SE |
491 | const struct sk_buff *skb, |
492 | unsigned long delay) | |
c6c8fea2 | 493 | { |
56303d34 SE |
494 | struct batadv_hard_iface *primary_if = NULL; |
495 | struct batadv_forw_packet *forw_packet; | |
96412690 | 496 | struct batadv_bcast_packet *bcast_packet; |
747e4221 | 497 | struct sk_buff *newskb; |
c6c8fea2 | 498 | |
3e34819e | 499 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
39c75a51 SE |
500 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
501 | "bcast packet queue full\n"); | |
c6c8fea2 SE |
502 | goto out; |
503 | } | |
504 | ||
e5d89254 | 505 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 506 | if (!primary_if) |
ca06c6eb | 507 | goto out_and_inc; |
c6c8fea2 | 508 | |
704509b8 | 509 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
c6c8fea2 SE |
510 | |
511 | if (!forw_packet) | |
512 | goto out_and_inc; | |
513 | ||
747e4221 SE |
514 | newskb = skb_copy(skb, GFP_ATOMIC); |
515 | if (!newskb) | |
c6c8fea2 SE |
516 | goto packet_free; |
517 | ||
518 | /* as we have a copy now, it is safe to decrease the TTL */ | |
96412690 | 519 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
a40d9b07 | 520 | bcast_packet->ttl--; |
c6c8fea2 | 521 | |
747e4221 | 522 | skb_reset_mac_header(newskb); |
c6c8fea2 | 523 | |
747e4221 | 524 | forw_packet->skb = newskb; |
32ae9b22 | 525 | forw_packet->if_incoming = primary_if; |
ef0a937f | 526 | forw_packet->if_outgoing = NULL; |
c6c8fea2 SE |
527 | |
528 | /* how often did we send the bcast packet ? */ | |
529 | forw_packet->num_packets = 0; | |
530 | ||
72414442 AQ |
531 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
532 | batadv_send_outstanding_bcast_packet); | |
533 | ||
bb079c82 | 534 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
c6c8fea2 SE |
535 | return NETDEV_TX_OK; |
536 | ||
537 | packet_free: | |
538 | kfree(forw_packet); | |
539 | out_and_inc: | |
540 | atomic_inc(&bat_priv->bcast_queue_left); | |
541 | out: | |
32ae9b22 | 542 | if (primary_if) |
82047ad7 | 543 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
544 | return NETDEV_TX_BUSY; |
545 | } | |
546 | ||
bb079c82 | 547 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
c6c8fea2 | 548 | { |
56303d34 | 549 | struct batadv_hard_iface *hard_iface; |
bbb1f90e | 550 | struct delayed_work *delayed_work; |
56303d34 | 551 | struct batadv_forw_packet *forw_packet; |
c6c8fea2 | 552 | struct sk_buff *skb1; |
56303d34 SE |
553 | struct net_device *soft_iface; |
554 | struct batadv_priv *bat_priv; | |
555 | ||
4ba4bc0f | 556 | delayed_work = to_delayed_work(work); |
56303d34 SE |
557 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
558 | delayed_work); | |
559 | soft_iface = forw_packet->if_incoming->soft_iface; | |
560 | bat_priv = netdev_priv(soft_iface); | |
c6c8fea2 SE |
561 | |
562 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
563 | hlist_del(&forw_packet->list); | |
564 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
565 | ||
39c75a51 | 566 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
567 | goto out; |
568 | ||
c384ea3e AQ |
569 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
570 | goto out; | |
571 | ||
c6c8fea2 SE |
572 | /* rebroadcast packet */ |
573 | rcu_read_lock(); | |
3193e8fd | 574 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 575 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
576 | continue; |
577 | ||
caf65bfc MS |
578 | if (forw_packet->num_packets >= hard_iface->num_bcasts) |
579 | continue; | |
580 | ||
27353446 SE |
581 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
582 | continue; | |
583 | ||
c6c8fea2 SE |
584 | /* send a copy of the saved skb */ |
585 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
586 | if (skb1) | |
95d39278 | 587 | batadv_send_broadcast_skb(skb1, hard_iface); |
27353446 SE |
588 | |
589 | batadv_hardif_put(hard_iface); | |
c6c8fea2 SE |
590 | } |
591 | rcu_read_unlock(); | |
592 | ||
593 | forw_packet->num_packets++; | |
594 | ||
595 | /* if we still have some more bcasts to send */ | |
caf65bfc | 596 | if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { |
bb079c82 SE |
597 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
598 | msecs_to_jiffies(5)); | |
c6c8fea2 SE |
599 | return; |
600 | } | |
601 | ||
602 | out: | |
bb079c82 | 603 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
604 | atomic_inc(&bat_priv->bcast_queue_left); |
605 | } | |
606 | ||
9455e34c | 607 | void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
c6c8fea2 | 608 | { |
bbb1f90e | 609 | struct delayed_work *delayed_work; |
56303d34 SE |
610 | struct batadv_forw_packet *forw_packet; |
611 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 612 | |
4ba4bc0f | 613 | delayed_work = to_delayed_work(work); |
56303d34 SE |
614 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
615 | delayed_work); | |
c6c8fea2 SE |
616 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
617 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
618 | hlist_del(&forw_packet->list); | |
619 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
620 | ||
39c75a51 | 621 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
622 | goto out; |
623 | ||
01c4224b | 624 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
c6c8fea2 | 625 | |
ef0a937f SW |
626 | /* we have to have at least one packet in the queue to determine the |
627 | * queues wake up time unless we are shutting down. | |
628 | * | |
629 | * only re-schedule if this is the "original" copy, e.g. the OGM of the | |
630 | * primary interface should only be rescheduled once per period, but | |
631 | * this function will be called for the forw_packet instances of the | |
632 | * other secondary interfaces as well. | |
c6c8fea2 | 633 | */ |
ef0a937f SW |
634 | if (forw_packet->own && |
635 | forw_packet->if_incoming == forw_packet->if_outgoing) | |
9455e34c | 636 | batadv_schedule_bat_ogm(forw_packet->if_incoming); |
c6c8fea2 SE |
637 | |
638 | out: | |
639 | /* don't count own packet */ | |
640 | if (!forw_packet->own) | |
641 | atomic_inc(&bat_priv->batman_queue_left); | |
642 | ||
bb079c82 | 643 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
644 | } |
645 | ||
56303d34 SE |
646 | void |
647 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, | |
648 | const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 649 | { |
56303d34 | 650 | struct batadv_forw_packet *forw_packet; |
b67bfe0d | 651 | struct hlist_node *safe_tmp_node; |
6d5808d4 | 652 | bool pending; |
c6c8fea2 | 653 | |
e6c10f43 | 654 | if (hard_iface) |
39c75a51 | 655 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
656 | "purge_outstanding_packets(): %s\n", |
657 | hard_iface->net_dev->name); | |
c6c8fea2 | 658 | else |
39c75a51 | 659 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 660 | "purge_outstanding_packets()\n"); |
c6c8fea2 SE |
661 | |
662 | /* free bcast list */ | |
663 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
b67bfe0d | 664 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 665 | &bat_priv->forw_bcast_list, list) { |
9cfc7bd6 | 666 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
667 | * we delete only packets belonging to the given interface |
668 | */ | |
e6c10f43 | 669 | if ((hard_iface) && |
3f1e08d0 SW |
670 | (forw_packet->if_incoming != hard_iface) && |
671 | (forw_packet->if_outgoing != hard_iface)) | |
c6c8fea2 SE |
672 | continue; |
673 | ||
674 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
675 | ||
bb079c82 | 676 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
c6c8fea2 SE |
677 | * delete the item from the list |
678 | */ | |
6d5808d4 | 679 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 680 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
6d5808d4 SE |
681 | |
682 | if (pending) { | |
683 | hlist_del(&forw_packet->list); | |
c4fdb6cf LL |
684 | if (!forw_packet->own) |
685 | atomic_inc(&bat_priv->bcast_queue_left); | |
686 | ||
bb079c82 | 687 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 688 | } |
c6c8fea2 SE |
689 | } |
690 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
691 | ||
692 | /* free batman packet list */ | |
693 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
b67bfe0d | 694 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 695 | &bat_priv->forw_bat_list, list) { |
9cfc7bd6 | 696 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
697 | * we delete only packets belonging to the given interface |
698 | */ | |
e6c10f43 | 699 | if ((hard_iface) && |
ef0a937f SW |
700 | (forw_packet->if_incoming != hard_iface) && |
701 | (forw_packet->if_outgoing != hard_iface)) | |
c6c8fea2 SE |
702 | continue; |
703 | ||
704 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
705 | ||
9cfc7bd6 | 706 | /* send_outstanding_bat_packet() will lock the list to |
c6c8fea2 SE |
707 | * delete the item from the list |
708 | */ | |
6d5808d4 | 709 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 710 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
6d5808d4 SE |
711 | |
712 | if (pending) { | |
713 | hlist_del(&forw_packet->list); | |
c4fdb6cf LL |
714 | if (!forw_packet->own) |
715 | atomic_inc(&bat_priv->batman_queue_left); | |
716 | ||
bb079c82 | 717 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 718 | } |
c6c8fea2 SE |
719 | } |
720 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
721 | } |