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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> | |
1e2c2a4f | 25 | #include <linux/if.h> |
fcafa5e7 | 26 | #include <linux/if_ether.h> |
1e2c2a4f SE |
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" |
ba412080 | 45 | #include "log.h" |
612d2b4f | 46 | #include "network-coding.h" |
1e2c2a4f SE |
47 | #include "originator.h" |
48 | #include "routing.h" | |
49 | #include "soft-interface.h" | |
50 | #include "translation-table.h" | |
af5d4f77 | 51 | |
bb079c82 | 52 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work); |
c6c8fea2 | 53 | |
95d39278 AQ |
54 | /** |
55 | * batadv_send_skb_packet - send an already prepared packet | |
56 | * @skb: the packet to send | |
57 | * @hard_iface: the interface to use to send the broadcast packet | |
58 | * @dst_addr: the payload destination | |
59 | * | |
60 | * Send out an already prepared packet to the given neighbor or broadcast it | |
61 | * using the specified interface. Either hard_iface or neigh_node must be not | |
62 | * NULL. | |
63 | * If neigh_node is NULL, then the packet is broadcasted using hard_iface, | |
64 | * otherwise it is sent as unicast to the given neighbor. | |
65 | * | |
66 | * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb) | |
67 | * otherwise | |
9cfc7bd6 | 68 | */ |
56303d34 SE |
69 | int batadv_send_skb_packet(struct sk_buff *skb, |
70 | struct batadv_hard_iface *hard_iface, | |
6b5e971a | 71 | const u8 *dst_addr) |
c6c8fea2 | 72 | { |
95d39278 | 73 | struct batadv_priv *bat_priv; |
c6c8fea2 SE |
74 | struct ethhdr *ethhdr; |
75 | ||
95d39278 AQ |
76 | bat_priv = netdev_priv(hard_iface->soft_iface); |
77 | ||
e9a4f295 | 78 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
79 | goto send_skb_err; |
80 | ||
e6c10f43 | 81 | if (unlikely(!hard_iface->net_dev)) |
c6c8fea2 SE |
82 | goto send_skb_err; |
83 | ||
e6c10f43 | 84 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
67969581 SE |
85 | pr_warn("Interface %s is not up - can't send packet via that interface!\n", |
86 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
87 | goto send_skb_err; |
88 | } | |
89 | ||
90 | /* push to the ethernet header. */ | |
04b482a2 | 91 | if (batadv_skb_head_push(skb, ETH_HLEN) < 0) |
c6c8fea2 SE |
92 | goto send_skb_err; |
93 | ||
94 | skb_reset_mac_header(skb); | |
95 | ||
7ed4be95 | 96 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
97 | ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); |
98 | ether_addr_copy(ethhdr->h_dest, dst_addr); | |
293e9338 | 99 | ethhdr->h_proto = htons(ETH_P_BATMAN); |
c6c8fea2 SE |
100 | |
101 | skb_set_network_header(skb, ETH_HLEN); | |
293e9338 | 102 | skb->protocol = htons(ETH_P_BATMAN); |
c6c8fea2 | 103 | |
e6c10f43 | 104 | skb->dev = hard_iface->net_dev; |
c6c8fea2 | 105 | |
612d2b4f MH |
106 | /* Save a clone of the skb to use when decoding coded packets */ |
107 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
108 | ||
c6c8fea2 SE |
109 | /* dev_queue_xmit() returns a negative result on error. However on |
110 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP | |
9cfc7bd6 SE |
111 | * (which is > 0). This will not be treated as an error. |
112 | */ | |
c6c8fea2 SE |
113 | return dev_queue_xmit(skb); |
114 | send_skb_err: | |
115 | kfree_skb(skb); | |
116 | return NET_XMIT_DROP; | |
117 | } | |
118 | ||
95d39278 AQ |
119 | int batadv_send_broadcast_skb(struct sk_buff *skb, |
120 | struct batadv_hard_iface *hard_iface) | |
121 | { | |
122 | return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); | |
123 | } | |
124 | ||
125 | int batadv_send_unicast_skb(struct sk_buff *skb, | |
126 | struct batadv_neigh_node *neigh) | |
127 | { | |
128 | #ifdef CONFIG_BATMAN_ADV_BATMAN_V | |
129 | struct batadv_hardif_neigh_node *hardif_neigh; | |
130 | #endif | |
131 | int ret; | |
132 | ||
133 | ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr); | |
134 | ||
135 | #ifdef CONFIG_BATMAN_ADV_BATMAN_V | |
136 | hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr); | |
137 | ||
138 | if ((hardif_neigh) && (ret != NET_XMIT_DROP)) | |
139 | hardif_neigh->bat_v.last_unicast_tx = jiffies; | |
140 | ||
141 | if (hardif_neigh) | |
142 | batadv_hardif_neigh_put(hardif_neigh); | |
143 | #endif | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
bb351ba0 MH |
148 | /** |
149 | * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. | |
150 | * @skb: Packet to be transmitted. | |
151 | * @orig_node: Final destination of the packet. | |
152 | * @recv_if: Interface used when receiving the packet (can be NULL). | |
153 | * | |
154 | * Looks up the best next-hop towards the passed originator and passes the | |
155 | * skb on for preparation of MAC header. If the packet originated from this | |
156 | * host, NULL can be passed as recv_if and no interface alternating is | |
157 | * attempted. | |
158 | * | |
62fe710f | 159 | * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or |
99860208 | 160 | * -EINPROGRESS if the skb is buffered for later transmit. |
bb351ba0 | 161 | */ |
e91ecfc6 MH |
162 | int batadv_send_skb_to_orig(struct sk_buff *skb, |
163 | struct batadv_orig_node *orig_node, | |
164 | struct batadv_hard_iface *recv_if) | |
bb351ba0 MH |
165 | { |
166 | struct batadv_priv *bat_priv = orig_node->bat_priv; | |
167 | struct batadv_neigh_node *neigh_node; | |
e91ecfc6 | 168 | int ret = NET_XMIT_DROP; |
bb351ba0 MH |
169 | |
170 | /* batadv_find_router() increases neigh_nodes refcount if found. */ | |
171 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); | |
172 | if (!neigh_node) | |
ee75ed88 MH |
173 | goto out; |
174 | ||
175 | /* Check if the skb is too large to send in one piece and fragment | |
176 | * it if needed. | |
177 | */ | |
178 | if (atomic_read(&bat_priv->fragmentation) && | |
179 | skb->len > neigh_node->if_incoming->net_dev->mtu) { | |
180 | /* Fragment and send packet. */ | |
181 | if (batadv_frag_send_packet(skb, orig_node, neigh_node)) | |
182 | ret = NET_XMIT_SUCCESS; | |
183 | ||
184 | goto out; | |
185 | } | |
bb351ba0 | 186 | |
e91ecfc6 MH |
187 | /* try to network code the packet, if it is received on an interface |
188 | * (i.e. being forwarded). If the packet originates from this node or if | |
189 | * network coding fails, then send the packet as usual. | |
190 | */ | |
191 | if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { | |
99860208 | 192 | ret = -EINPROGRESS; |
e91ecfc6 | 193 | } else { |
95d39278 | 194 | batadv_send_unicast_skb(skb, neigh_node); |
e91ecfc6 MH |
195 | ret = NET_XMIT_SUCCESS; |
196 | } | |
bb351ba0 | 197 | |
ee75ed88 MH |
198 | out: |
199 | if (neigh_node) | |
25bb2509 | 200 | batadv_neigh_node_put(neigh_node); |
bb351ba0 | 201 | |
e91ecfc6 | 202 | return ret; |
bb351ba0 MH |
203 | } |
204 | ||
f097e25d MH |
205 | /** |
206 | * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the | |
207 | * common fields for unicast packets | |
208 | * @skb: the skb carrying the unicast header to initialize | |
209 | * @hdr_size: amount of bytes to push at the beginning of the skb | |
210 | * @orig_node: the destination node | |
211 | * | |
62fe710f | 212 | * Return: false if the buffer extension was not possible or true otherwise. |
f097e25d MH |
213 | */ |
214 | static bool | |
215 | batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, | |
216 | struct batadv_orig_node *orig_node) | |
217 | { | |
218 | struct batadv_unicast_packet *unicast_packet; | |
6b5e971a | 219 | u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
f097e25d MH |
220 | |
221 | if (batadv_skb_head_push(skb, hdr_size) < 0) | |
222 | return false; | |
223 | ||
224 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 | 225 | unicast_packet->version = BATADV_COMPAT_VERSION; |
f097e25d | 226 | /* batman packet type: unicast */ |
a40d9b07 | 227 | unicast_packet->packet_type = BATADV_UNICAST; |
f097e25d | 228 | /* set unicast ttl */ |
a40d9b07 | 229 | unicast_packet->ttl = BATADV_TTL; |
f097e25d | 230 | /* copy the destination for faster routing */ |
8fdd0153 | 231 | ether_addr_copy(unicast_packet->dest, orig_node->orig); |
f097e25d MH |
232 | /* set the destination tt version number */ |
233 | unicast_packet->ttvn = ttvn; | |
234 | ||
235 | return true; | |
236 | } | |
237 | ||
238 | /** | |
239 | * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header | |
240 | * @skb: the skb containing the payload to encapsulate | |
241 | * @orig_node: the destination node | |
242 | * | |
62fe710f | 243 | * Return: false if the payload could not be encapsulated or true otherwise. |
f097e25d MH |
244 | */ |
245 | static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, | |
246 | struct batadv_orig_node *orig_node) | |
247 | { | |
248 | size_t uni_size = sizeof(struct batadv_unicast_packet); | |
249 | ||
250 | return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); | |
251 | } | |
252 | ||
253 | /** | |
254 | * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a | |
255 | * unicast 4addr header | |
256 | * @bat_priv: the bat priv with all the soft interface information | |
257 | * @skb: the skb containing the payload to encapsulate | |
e51f0397 | 258 | * @orig: the destination node |
f097e25d MH |
259 | * @packet_subtype: the unicast 4addr packet subtype to use |
260 | * | |
62fe710f | 261 | * Return: false if the payload could not be encapsulated or true otherwise. |
f097e25d MH |
262 | */ |
263 | bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, | |
264 | struct sk_buff *skb, | |
265 | struct batadv_orig_node *orig, | |
266 | int packet_subtype) | |
267 | { | |
268 | struct batadv_hard_iface *primary_if; | |
269 | struct batadv_unicast_4addr_packet *uc_4addr_packet; | |
270 | bool ret = false; | |
271 | ||
272 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
273 | if (!primary_if) | |
274 | goto out; | |
275 | ||
276 | /* Pull the header space and fill the unicast_packet substructure. | |
277 | * We can do that because the first member of the uc_4addr_packet | |
278 | * is of type struct unicast_packet | |
279 | */ | |
280 | if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), | |
281 | orig)) | |
282 | goto out; | |
283 | ||
284 | uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; | |
a40d9b07 | 285 | uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; |
8fdd0153 | 286 | ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); |
f097e25d MH |
287 | uc_4addr_packet->subtype = packet_subtype; |
288 | uc_4addr_packet->reserved = 0; | |
289 | ||
290 | ret = true; | |
291 | out: | |
292 | if (primary_if) | |
82047ad7 | 293 | batadv_hardif_put(primary_if); |
f097e25d MH |
294 | return ret; |
295 | } | |
296 | ||
297 | /** | |
e300d314 | 298 | * batadv_send_skb_unicast - encapsulate and send an skb via unicast |
f097e25d MH |
299 | * @bat_priv: the bat priv with all the soft interface information |
300 | * @skb: payload to send | |
301 | * @packet_type: the batman unicast packet type to use | |
302 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast | |
303 | * 4addr packets) | |
e300d314 | 304 | * @orig_node: the originator to send the packet to |
c018ad3d | 305 | * @vid: the vid to be used to search the translation table |
f097e25d | 306 | * |
e300d314 LL |
307 | * Wrap the given skb into a batman-adv unicast or unicast-4addr header |
308 | * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied | |
309 | * as packet_type. Then send this frame to the given orig_node and release a | |
310 | * reference to this orig_node. | |
311 | * | |
62fe710f | 312 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
f097e25d | 313 | */ |
1d8ab8d3 LL |
314 | int batadv_send_skb_unicast(struct batadv_priv *bat_priv, |
315 | struct sk_buff *skb, int packet_type, | |
316 | int packet_subtype, | |
317 | struct batadv_orig_node *orig_node, | |
318 | unsigned short vid) | |
f097e25d | 319 | { |
f097e25d | 320 | struct batadv_unicast_packet *unicast_packet; |
8ea64e27 | 321 | struct ethhdr *ethhdr; |
927c2ed7 | 322 | int ret = NET_XMIT_DROP; |
f097e25d | 323 | |
56a5ca84 | 324 | if (!orig_node) |
f097e25d MH |
325 | goto out; |
326 | ||
327 | switch (packet_type) { | |
328 | case BATADV_UNICAST: | |
33faa045 AQ |
329 | if (!batadv_send_skb_prepare_unicast(skb, orig_node)) |
330 | goto out; | |
f097e25d MH |
331 | break; |
332 | case BATADV_UNICAST_4ADDR: | |
33faa045 AQ |
333 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, |
334 | orig_node, | |
335 | packet_subtype)) | |
336 | goto out; | |
f097e25d MH |
337 | break; |
338 | default: | |
339 | /* this function supports UNICAST and UNICAST_4ADDR only. It | |
340 | * should never be invoked with any other packet type | |
341 | */ | |
342 | goto out; | |
343 | } | |
344 | ||
927c2ed7 LL |
345 | /* skb->data might have been reallocated by |
346 | * batadv_send_skb_prepare_unicast{,_4addr}() | |
347 | */ | |
348 | ethhdr = eth_hdr(skb); | |
f097e25d MH |
349 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
350 | ||
351 | /* inform the destination node that we are still missing a correct route | |
352 | * for this client. The destination will receive this packet and will | |
353 | * try to reroute it because the ttvn contained in the header is less | |
354 | * than the current one | |
355 | */ | |
c018ad3d | 356 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) |
f097e25d MH |
357 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
358 | ||
359 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) | |
e300d314 | 360 | ret = NET_XMIT_SUCCESS; |
f097e25d MH |
361 | |
362 | out: | |
f097e25d | 363 | if (orig_node) |
5d967310 | 364 | batadv_orig_node_put(orig_node); |
e300d314 | 365 | if (ret == NET_XMIT_DROP) |
f097e25d MH |
366 | kfree_skb(skb); |
367 | return ret; | |
368 | } | |
369 | ||
e300d314 LL |
370 | /** |
371 | * batadv_send_skb_via_tt_generic - send an skb via TT lookup | |
372 | * @bat_priv: the bat priv with all the soft interface information | |
373 | * @skb: payload to send | |
374 | * @packet_type: the batman unicast packet type to use | |
375 | * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast | |
376 | * 4addr packets) | |
c5d3a652 | 377 | * @dst_hint: can be used to override the destination contained in the skb |
e300d314 LL |
378 | * @vid: the vid to be used to search the translation table |
379 | * | |
380 | * Look up the recipient node for the destination address in the ethernet | |
381 | * header via the translation table. Wrap the given skb into a batman-adv | |
382 | * unicast or unicast-4addr header depending on whether BATADV_UNICAST or | |
383 | * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame | |
384 | * to the according destination node. | |
385 | * | |
62fe710f | 386 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
e300d314 LL |
387 | */ |
388 | int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, | |
389 | struct sk_buff *skb, int packet_type, | |
6b5e971a | 390 | int packet_subtype, u8 *dst_hint, |
6c413b1c | 391 | unsigned short vid) |
e300d314 LL |
392 | { |
393 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; | |
394 | struct batadv_orig_node *orig_node; | |
6b5e971a | 395 | u8 *src, *dst; |
6c413b1c AQ |
396 | |
397 | src = ethhdr->h_source; | |
398 | dst = ethhdr->h_dest; | |
399 | ||
400 | /* if we got an hint! let's send the packet to this client (if any) */ | |
401 | if (dst_hint) { | |
402 | src = NULL; | |
403 | dst = dst_hint; | |
404 | } | |
405 | orig_node = batadv_transtable_search(bat_priv, src, dst, vid); | |
e300d314 | 406 | |
e300d314 LL |
407 | return batadv_send_skb_unicast(bat_priv, skb, packet_type, |
408 | packet_subtype, orig_node, vid); | |
409 | } | |
410 | ||
411 | /** | |
412 | * batadv_send_skb_via_gw - send an skb via gateway lookup | |
413 | * @bat_priv: the bat priv with all the soft interface information | |
414 | * @skb: payload to send | |
415 | * @vid: the vid to be used to search the translation table | |
416 | * | |
417 | * Look up the currently selected gateway. Wrap the given skb into a batman-adv | |
418 | * unicast header and send this frame to this gateway node. | |
419 | * | |
62fe710f | 420 | * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. |
e300d314 LL |
421 | */ |
422 | int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
423 | unsigned short vid) | |
424 | { | |
425 | struct batadv_orig_node *orig_node; | |
426 | ||
427 | orig_node = batadv_gw_get_selected_orig(bat_priv); | |
428 | return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, | |
429 | orig_node, vid); | |
430 | } | |
431 | ||
f0d97253 | 432 | void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
c6c8fea2 | 433 | { |
c799443e | 434 | kfree_skb(forw_packet->skb); |
6d5808d4 | 435 | if (forw_packet->if_incoming) |
82047ad7 | 436 | batadv_hardif_put(forw_packet->if_incoming); |
ef0a937f | 437 | if (forw_packet->if_outgoing) |
82047ad7 | 438 | batadv_hardif_put(forw_packet->if_outgoing); |
c6c8fea2 SE |
439 | kfree(forw_packet); |
440 | } | |
441 | ||
56303d34 SE |
442 | static void |
443 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, | |
444 | struct batadv_forw_packet *forw_packet, | |
445 | unsigned long send_time) | |
c6c8fea2 | 446 | { |
c6c8fea2 SE |
447 | /* add new packet to packet list */ |
448 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
449 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); | |
450 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
451 | ||
452 | /* start timer for this packet */ | |
3193e8fd | 453 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
c6c8fea2 SE |
454 | send_time); |
455 | } | |
456 | ||
62fe710f | 457 | /** |
7afcbbef SE |
458 | * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends |
459 | * @bat_priv: the bat priv with all the soft interface information | |
460 | * @skb: broadcast packet to add | |
461 | * @delay: number of jiffies to wait before sending | |
c6c8fea2 | 462 | * |
62fe710f SE |
463 | * add a broadcast packet to the queue and setup timers. broadcast packets |
464 | * are sent multiple times to increase probability for being received. | |
c6c8fea2 SE |
465 | * |
466 | * The skb is not consumed, so the caller should make sure that the | |
9cfc7bd6 | 467 | * skb is freed. |
62fe710f SE |
468 | * |
469 | * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. | |
9cfc7bd6 | 470 | */ |
56303d34 | 471 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
9455e34c SE |
472 | const struct sk_buff *skb, |
473 | unsigned long delay) | |
c6c8fea2 | 474 | { |
56303d34 SE |
475 | struct batadv_hard_iface *primary_if = NULL; |
476 | struct batadv_forw_packet *forw_packet; | |
96412690 | 477 | struct batadv_bcast_packet *bcast_packet; |
747e4221 | 478 | struct sk_buff *newskb; |
c6c8fea2 | 479 | |
3e34819e | 480 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
39c75a51 SE |
481 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
482 | "bcast packet queue full\n"); | |
c6c8fea2 SE |
483 | goto out; |
484 | } | |
485 | ||
e5d89254 | 486 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 487 | if (!primary_if) |
ca06c6eb | 488 | goto out_and_inc; |
c6c8fea2 | 489 | |
704509b8 | 490 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
c6c8fea2 SE |
491 | |
492 | if (!forw_packet) | |
493 | goto out_and_inc; | |
494 | ||
747e4221 SE |
495 | newskb = skb_copy(skb, GFP_ATOMIC); |
496 | if (!newskb) | |
c6c8fea2 SE |
497 | goto packet_free; |
498 | ||
499 | /* as we have a copy now, it is safe to decrease the TTL */ | |
96412690 | 500 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
a40d9b07 | 501 | bcast_packet->ttl--; |
c6c8fea2 | 502 | |
747e4221 | 503 | skb_reset_mac_header(newskb); |
c6c8fea2 | 504 | |
747e4221 | 505 | forw_packet->skb = newskb; |
32ae9b22 | 506 | forw_packet->if_incoming = primary_if; |
ef0a937f | 507 | forw_packet->if_outgoing = NULL; |
c6c8fea2 SE |
508 | |
509 | /* how often did we send the bcast packet ? */ | |
510 | forw_packet->num_packets = 0; | |
511 | ||
72414442 AQ |
512 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
513 | batadv_send_outstanding_bcast_packet); | |
514 | ||
bb079c82 | 515 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
c6c8fea2 SE |
516 | return NETDEV_TX_OK; |
517 | ||
518 | packet_free: | |
519 | kfree(forw_packet); | |
520 | out_and_inc: | |
521 | atomic_inc(&bat_priv->bcast_queue_left); | |
522 | out: | |
32ae9b22 | 523 | if (primary_if) |
82047ad7 | 524 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
525 | return NETDEV_TX_BUSY; |
526 | } | |
527 | ||
bb079c82 | 528 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
c6c8fea2 | 529 | { |
56303d34 | 530 | struct batadv_hard_iface *hard_iface; |
bbb1f90e | 531 | struct delayed_work *delayed_work; |
56303d34 | 532 | struct batadv_forw_packet *forw_packet; |
c6c8fea2 | 533 | struct sk_buff *skb1; |
56303d34 SE |
534 | struct net_device *soft_iface; |
535 | struct batadv_priv *bat_priv; | |
536 | ||
4ba4bc0f | 537 | delayed_work = to_delayed_work(work); |
56303d34 SE |
538 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
539 | delayed_work); | |
540 | soft_iface = forw_packet->if_incoming->soft_iface; | |
541 | bat_priv = netdev_priv(soft_iface); | |
c6c8fea2 SE |
542 | |
543 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
544 | hlist_del(&forw_packet->list); | |
545 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
546 | ||
39c75a51 | 547 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
548 | goto out; |
549 | ||
c384ea3e AQ |
550 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
551 | goto out; | |
552 | ||
c6c8fea2 SE |
553 | /* rebroadcast packet */ |
554 | rcu_read_lock(); | |
3193e8fd | 555 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 556 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
557 | continue; |
558 | ||
caf65bfc MS |
559 | if (forw_packet->num_packets >= hard_iface->num_bcasts) |
560 | continue; | |
561 | ||
27353446 SE |
562 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
563 | continue; | |
564 | ||
c6c8fea2 SE |
565 | /* send a copy of the saved skb */ |
566 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
567 | if (skb1) | |
95d39278 | 568 | batadv_send_broadcast_skb(skb1, hard_iface); |
27353446 SE |
569 | |
570 | batadv_hardif_put(hard_iface); | |
c6c8fea2 SE |
571 | } |
572 | rcu_read_unlock(); | |
573 | ||
574 | forw_packet->num_packets++; | |
575 | ||
576 | /* if we still have some more bcasts to send */ | |
caf65bfc | 577 | if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { |
bb079c82 SE |
578 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
579 | msecs_to_jiffies(5)); | |
c6c8fea2 SE |
580 | return; |
581 | } | |
582 | ||
583 | out: | |
bb079c82 | 584 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
585 | atomic_inc(&bat_priv->bcast_queue_left); |
586 | } | |
587 | ||
56303d34 SE |
588 | void |
589 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, | |
590 | const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 591 | { |
56303d34 | 592 | struct batadv_forw_packet *forw_packet; |
b67bfe0d | 593 | struct hlist_node *safe_tmp_node; |
6d5808d4 | 594 | bool pending; |
c6c8fea2 | 595 | |
e6c10f43 | 596 | if (hard_iface) |
39c75a51 | 597 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
598 | "purge_outstanding_packets(): %s\n", |
599 | hard_iface->net_dev->name); | |
c6c8fea2 | 600 | else |
39c75a51 | 601 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 602 | "purge_outstanding_packets()\n"); |
c6c8fea2 SE |
603 | |
604 | /* free bcast list */ | |
605 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
b67bfe0d | 606 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 607 | &bat_priv->forw_bcast_list, list) { |
9cfc7bd6 | 608 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
609 | * we delete only packets belonging to the given interface |
610 | */ | |
e6c10f43 | 611 | if ((hard_iface) && |
3f1e08d0 SW |
612 | (forw_packet->if_incoming != hard_iface) && |
613 | (forw_packet->if_outgoing != hard_iface)) | |
c6c8fea2 SE |
614 | continue; |
615 | ||
616 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
617 | ||
bb079c82 | 618 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
c6c8fea2 SE |
619 | * delete the item from the list |
620 | */ | |
6d5808d4 | 621 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 622 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
6d5808d4 SE |
623 | |
624 | if (pending) { | |
625 | hlist_del(&forw_packet->list); | |
c4fdb6cf LL |
626 | if (!forw_packet->own) |
627 | atomic_inc(&bat_priv->bcast_queue_left); | |
628 | ||
bb079c82 | 629 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 630 | } |
c6c8fea2 SE |
631 | } |
632 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
633 | ||
634 | /* free batman packet list */ | |
635 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
b67bfe0d | 636 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 637 | &bat_priv->forw_bat_list, list) { |
9cfc7bd6 | 638 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
639 | * we delete only packets belonging to the given interface |
640 | */ | |
e6c10f43 | 641 | if ((hard_iface) && |
ef0a937f SW |
642 | (forw_packet->if_incoming != hard_iface) && |
643 | (forw_packet->if_outgoing != hard_iface)) | |
c6c8fea2 SE |
644 | continue; |
645 | ||
646 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
647 | ||
9cfc7bd6 | 648 | /* send_outstanding_bat_packet() will lock the list to |
c6c8fea2 SE |
649 | * delete the item from the list |
650 | */ | |
6d5808d4 | 651 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 652 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
6d5808d4 SE |
653 | |
654 | if (pending) { | |
655 | hlist_del(&forw_packet->list); | |
c4fdb6cf LL |
656 | if (!forw_packet->own) |
657 | atomic_inc(&bat_priv->batman_queue_left); | |
658 | ||
bb079c82 | 659 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 660 | } |
c6c8fea2 SE |
661 | } |
662 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
663 | } |