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0b873931 | 1 | /* Copyright (C) 2007-2013 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 | |
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 | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
c384ea3e | 21 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
22 | #include "send.h" |
23 | #include "routing.h" | |
24 | #include "translation-table.h" | |
25 | #include "soft-interface.h" | |
26 | #include "hard-interface.h" | |
c6c8fea2 | 27 | #include "vis.h" |
c6c8fea2 SE |
28 | #include "gateway_common.h" |
29 | #include "originator.h" | |
612d2b4f | 30 | #include "network-coding.h" |
c6c8fea2 | 31 | |
af5d4f77 AQ |
32 | #include <linux/if_ether.h> |
33 | ||
bb079c82 | 34 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work); |
c6c8fea2 | 35 | |
c6c8fea2 | 36 | /* send out an already prepared packet to the given address via the |
9cfc7bd6 SE |
37 | * specified batman interface |
38 | */ | |
56303d34 SE |
39 | int batadv_send_skb_packet(struct sk_buff *skb, |
40 | struct batadv_hard_iface *hard_iface, | |
9455e34c | 41 | const uint8_t *dst_addr) |
c6c8fea2 | 42 | { |
612d2b4f | 43 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 SE |
44 | struct ethhdr *ethhdr; |
45 | ||
e9a4f295 | 46 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
47 | goto send_skb_err; |
48 | ||
e6c10f43 | 49 | if (unlikely(!hard_iface->net_dev)) |
c6c8fea2 SE |
50 | goto send_skb_err; |
51 | ||
e6c10f43 | 52 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
67969581 SE |
53 | pr_warn("Interface %s is not up - can't send packet via that interface!\n", |
54 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
55 | goto send_skb_err; |
56 | } | |
57 | ||
58 | /* push to the ethernet header. */ | |
04b482a2 | 59 | if (batadv_skb_head_push(skb, ETH_HLEN) < 0) |
c6c8fea2 SE |
60 | goto send_skb_err; |
61 | ||
62 | skb_reset_mac_header(skb); | |
63 | ||
7ed4be95 | 64 | ethhdr = eth_hdr(skb); |
e6c10f43 | 65 | memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 66 | memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); |
af5d4f77 | 67 | ethhdr->h_proto = __constant_htons(ETH_P_BATMAN); |
c6c8fea2 SE |
68 | |
69 | skb_set_network_header(skb, ETH_HLEN); | |
70 | skb->priority = TC_PRIO_CONTROL; | |
af5d4f77 | 71 | skb->protocol = __constant_htons(ETH_P_BATMAN); |
c6c8fea2 | 72 | |
e6c10f43 | 73 | skb->dev = hard_iface->net_dev; |
c6c8fea2 | 74 | |
612d2b4f MH |
75 | /* Save a clone of the skb to use when decoding coded packets */ |
76 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
77 | ||
c6c8fea2 SE |
78 | /* dev_queue_xmit() returns a negative result on error. However on |
79 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP | |
9cfc7bd6 SE |
80 | * (which is > 0). This will not be treated as an error. |
81 | */ | |
c6c8fea2 SE |
82 | return dev_queue_xmit(skb); |
83 | send_skb_err: | |
84 | kfree_skb(skb); | |
85 | return NET_XMIT_DROP; | |
86 | } | |
87 | ||
bb351ba0 MH |
88 | /** |
89 | * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. | |
90 | * @skb: Packet to be transmitted. | |
91 | * @orig_node: Final destination of the packet. | |
92 | * @recv_if: Interface used when receiving the packet (can be NULL). | |
93 | * | |
94 | * Looks up the best next-hop towards the passed originator and passes the | |
95 | * skb on for preparation of MAC header. If the packet originated from this | |
96 | * host, NULL can be passed as recv_if and no interface alternating is | |
97 | * attempted. | |
98 | * | |
e91ecfc6 MH |
99 | * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or |
100 | * NET_XMIT_POLICED if the skb is buffered for later transmit. | |
bb351ba0 | 101 | */ |
e91ecfc6 MH |
102 | int batadv_send_skb_to_orig(struct sk_buff *skb, |
103 | struct batadv_orig_node *orig_node, | |
104 | struct batadv_hard_iface *recv_if) | |
bb351ba0 MH |
105 | { |
106 | struct batadv_priv *bat_priv = orig_node->bat_priv; | |
107 | struct batadv_neigh_node *neigh_node; | |
e91ecfc6 | 108 | int ret = NET_XMIT_DROP; |
bb351ba0 MH |
109 | |
110 | /* batadv_find_router() increases neigh_nodes refcount if found. */ | |
111 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); | |
112 | if (!neigh_node) | |
e91ecfc6 | 113 | return ret; |
bb351ba0 | 114 | |
e91ecfc6 MH |
115 | /* try to network code the packet, if it is received on an interface |
116 | * (i.e. being forwarded). If the packet originates from this node or if | |
117 | * network coding fails, then send the packet as usual. | |
118 | */ | |
119 | if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { | |
120 | ret = NET_XMIT_POLICED; | |
121 | } else { | |
122 | batadv_send_skb_packet(skb, neigh_node->if_incoming, | |
123 | neigh_node->addr); | |
124 | ret = NET_XMIT_SUCCESS; | |
125 | } | |
bb351ba0 MH |
126 | |
127 | batadv_neigh_node_free_ref(neigh_node); | |
128 | ||
e91ecfc6 | 129 | return ret; |
bb351ba0 MH |
130 | } |
131 | ||
56303d34 | 132 | void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 133 | { |
56303d34 | 134 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 135 | |
e9a4f295 SE |
136 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || |
137 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) | |
c6c8fea2 SE |
138 | return; |
139 | ||
9cfc7bd6 | 140 | /* the interface gets activated here to avoid race conditions between |
c6c8fea2 SE |
141 | * the moment of activating the interface in |
142 | * hardif_activate_interface() where the originator mac is set and | |
143 | * outdated packets (especially uninitialized mac addresses) in the | |
144 | * packet queue | |
145 | */ | |
e9a4f295 SE |
146 | if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
147 | hard_iface->if_status = BATADV_IF_ACTIVE; | |
c6c8fea2 | 148 | |
be9aa4c1 | 149 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); |
c6c8fea2 SE |
150 | } |
151 | ||
56303d34 | 152 | static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
c6c8fea2 SE |
153 | { |
154 | if (forw_packet->skb) | |
155 | kfree_skb(forw_packet->skb); | |
6d5808d4 | 156 | if (forw_packet->if_incoming) |
e5d89254 | 157 | batadv_hardif_free_ref(forw_packet->if_incoming); |
c6c8fea2 SE |
158 | kfree(forw_packet); |
159 | } | |
160 | ||
56303d34 SE |
161 | static void |
162 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, | |
163 | struct batadv_forw_packet *forw_packet, | |
164 | unsigned long send_time) | |
c6c8fea2 | 165 | { |
c6c8fea2 SE |
166 | /* add new packet to packet list */ |
167 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
168 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); | |
169 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
170 | ||
171 | /* start timer for this packet */ | |
3193e8fd | 172 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
c6c8fea2 SE |
173 | send_time); |
174 | } | |
175 | ||
c6c8fea2 | 176 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
015758d0 | 177 | * are sent multiple times to increase probability for being received. |
c6c8fea2 SE |
178 | * |
179 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on | |
180 | * errors. | |
181 | * | |
182 | * The skb is not consumed, so the caller should make sure that the | |
9cfc7bd6 SE |
183 | * skb is freed. |
184 | */ | |
56303d34 | 185 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
9455e34c SE |
186 | const struct sk_buff *skb, |
187 | unsigned long delay) | |
c6c8fea2 | 188 | { |
56303d34 SE |
189 | struct batadv_hard_iface *primary_if = NULL; |
190 | struct batadv_forw_packet *forw_packet; | |
96412690 | 191 | struct batadv_bcast_packet *bcast_packet; |
747e4221 | 192 | struct sk_buff *newskb; |
c6c8fea2 | 193 | |
3e34819e | 194 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
39c75a51 SE |
195 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
196 | "bcast packet queue full\n"); | |
c6c8fea2 SE |
197 | goto out; |
198 | } | |
199 | ||
e5d89254 | 200 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 201 | if (!primary_if) |
ca06c6eb | 202 | goto out_and_inc; |
c6c8fea2 | 203 | |
704509b8 | 204 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
c6c8fea2 SE |
205 | |
206 | if (!forw_packet) | |
207 | goto out_and_inc; | |
208 | ||
747e4221 SE |
209 | newskb = skb_copy(skb, GFP_ATOMIC); |
210 | if (!newskb) | |
c6c8fea2 SE |
211 | goto packet_free; |
212 | ||
213 | /* as we have a copy now, it is safe to decrease the TTL */ | |
96412690 | 214 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
76543d14 | 215 | bcast_packet->header.ttl--; |
c6c8fea2 | 216 | |
747e4221 | 217 | skb_reset_mac_header(newskb); |
c6c8fea2 | 218 | |
747e4221 | 219 | forw_packet->skb = newskb; |
32ae9b22 | 220 | forw_packet->if_incoming = primary_if; |
c6c8fea2 SE |
221 | |
222 | /* how often did we send the bcast packet ? */ | |
223 | forw_packet->num_packets = 0; | |
224 | ||
72414442 AQ |
225 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
226 | batadv_send_outstanding_bcast_packet); | |
227 | ||
bb079c82 | 228 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
c6c8fea2 SE |
229 | return NETDEV_TX_OK; |
230 | ||
231 | packet_free: | |
232 | kfree(forw_packet); | |
233 | out_and_inc: | |
234 | atomic_inc(&bat_priv->bcast_queue_left); | |
235 | out: | |
32ae9b22 | 236 | if (primary_if) |
e5d89254 | 237 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
238 | return NETDEV_TX_BUSY; |
239 | } | |
240 | ||
bb079c82 | 241 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
c6c8fea2 | 242 | { |
56303d34 | 243 | struct batadv_hard_iface *hard_iface; |
bbb1f90e | 244 | struct delayed_work *delayed_work; |
56303d34 | 245 | struct batadv_forw_packet *forw_packet; |
c6c8fea2 | 246 | struct sk_buff *skb1; |
56303d34 SE |
247 | struct net_device *soft_iface; |
248 | struct batadv_priv *bat_priv; | |
249 | ||
bbb1f90e | 250 | delayed_work = container_of(work, struct delayed_work, work); |
56303d34 SE |
251 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
252 | delayed_work); | |
253 | soft_iface = forw_packet->if_incoming->soft_iface; | |
254 | bat_priv = netdev_priv(soft_iface); | |
c6c8fea2 SE |
255 | |
256 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
257 | hlist_del(&forw_packet->list); | |
258 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
259 | ||
39c75a51 | 260 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
261 | goto out; |
262 | ||
c384ea3e AQ |
263 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
264 | goto out; | |
265 | ||
c6c8fea2 SE |
266 | /* rebroadcast packet */ |
267 | rcu_read_lock(); | |
3193e8fd | 268 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 269 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
270 | continue; |
271 | ||
caf65bfc MS |
272 | if (forw_packet->num_packets >= hard_iface->num_bcasts) |
273 | continue; | |
274 | ||
c6c8fea2 SE |
275 | /* send a copy of the saved skb */ |
276 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
277 | if (skb1) | |
9455e34c | 278 | batadv_send_skb_packet(skb1, hard_iface, |
3193e8fd | 279 | batadv_broadcast_addr); |
c6c8fea2 SE |
280 | } |
281 | rcu_read_unlock(); | |
282 | ||
283 | forw_packet->num_packets++; | |
284 | ||
285 | /* if we still have some more bcasts to send */ | |
caf65bfc | 286 | if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { |
bb079c82 SE |
287 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
288 | msecs_to_jiffies(5)); | |
c6c8fea2 SE |
289 | return; |
290 | } | |
291 | ||
292 | out: | |
bb079c82 | 293 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
294 | atomic_inc(&bat_priv->bcast_queue_left); |
295 | } | |
296 | ||
9455e34c | 297 | void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
c6c8fea2 | 298 | { |
bbb1f90e | 299 | struct delayed_work *delayed_work; |
56303d34 SE |
300 | struct batadv_forw_packet *forw_packet; |
301 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 302 | |
bbb1f90e | 303 | delayed_work = container_of(work, struct delayed_work, work); |
56303d34 SE |
304 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
305 | delayed_work); | |
c6c8fea2 SE |
306 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
307 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
308 | hlist_del(&forw_packet->list); | |
309 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
310 | ||
39c75a51 | 311 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
312 | goto out; |
313 | ||
01c4224b | 314 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
c6c8fea2 | 315 | |
9cfc7bd6 | 316 | /* we have to have at least one packet in the queue |
c6c8fea2 SE |
317 | * to determine the queues wake up time unless we are |
318 | * shutting down | |
319 | */ | |
320 | if (forw_packet->own) | |
9455e34c | 321 | batadv_schedule_bat_ogm(forw_packet->if_incoming); |
c6c8fea2 SE |
322 | |
323 | out: | |
324 | /* don't count own packet */ | |
325 | if (!forw_packet->own) | |
326 | atomic_inc(&bat_priv->batman_queue_left); | |
327 | ||
bb079c82 | 328 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
329 | } |
330 | ||
56303d34 SE |
331 | void |
332 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, | |
333 | const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 334 | { |
56303d34 | 335 | struct batadv_forw_packet *forw_packet; |
b67bfe0d | 336 | struct hlist_node *safe_tmp_node; |
6d5808d4 | 337 | bool pending; |
c6c8fea2 | 338 | |
e6c10f43 | 339 | if (hard_iface) |
39c75a51 | 340 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
341 | "purge_outstanding_packets(): %s\n", |
342 | hard_iface->net_dev->name); | |
c6c8fea2 | 343 | else |
39c75a51 | 344 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 345 | "purge_outstanding_packets()\n"); |
c6c8fea2 SE |
346 | |
347 | /* free bcast list */ | |
348 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
b67bfe0d | 349 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 350 | &bat_priv->forw_bcast_list, list) { |
9cfc7bd6 | 351 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
352 | * we delete only packets belonging to the given interface |
353 | */ | |
e6c10f43 ML |
354 | if ((hard_iface) && |
355 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
356 | continue; |
357 | ||
358 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
359 | ||
bb079c82 | 360 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
c6c8fea2 SE |
361 | * delete the item from the list |
362 | */ | |
6d5808d4 | 363 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 364 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
6d5808d4 SE |
365 | |
366 | if (pending) { | |
367 | hlist_del(&forw_packet->list); | |
bb079c82 | 368 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 369 | } |
c6c8fea2 SE |
370 | } |
371 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
372 | ||
373 | /* free batman packet list */ | |
374 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
b67bfe0d | 375 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 376 | &bat_priv->forw_bat_list, list) { |
9cfc7bd6 | 377 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
378 | * we delete only packets belonging to the given interface |
379 | */ | |
e6c10f43 ML |
380 | if ((hard_iface) && |
381 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
382 | continue; |
383 | ||
384 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
385 | ||
9cfc7bd6 | 386 | /* send_outstanding_bat_packet() will lock the list to |
c6c8fea2 SE |
387 | * delete the item from the list |
388 | */ | |
6d5808d4 | 389 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 390 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
6d5808d4 SE |
391 | |
392 | if (pending) { | |
393 | hlist_del(&forw_packet->list); | |
bb079c82 | 394 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 395 | } |
c6c8fea2 SE |
396 | } |
397 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
398 | } |