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