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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 | ||
40e0c4f5 | 64 | ethhdr = (struct ethhdr *)skb_mac_header(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 | * | |
99 | * Returns TRUE on success; FALSE otherwise. | |
100 | */ | |
101 | bool batadv_send_skb_to_orig(struct sk_buff *skb, | |
102 | struct batadv_orig_node *orig_node, | |
103 | struct batadv_hard_iface *recv_if) | |
104 | { | |
105 | struct batadv_priv *bat_priv = orig_node->bat_priv; | |
106 | struct batadv_neigh_node *neigh_node; | |
107 | ||
108 | /* batadv_find_router() increases neigh_nodes refcount if found. */ | |
109 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); | |
110 | if (!neigh_node) | |
111 | return false; | |
112 | ||
113 | /* route it */ | |
114 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); | |
115 | ||
116 | batadv_neigh_node_free_ref(neigh_node); | |
117 | ||
118 | return true; | |
119 | } | |
120 | ||
56303d34 | 121 | void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 122 | { |
56303d34 | 123 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 124 | |
e9a4f295 SE |
125 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || |
126 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) | |
c6c8fea2 SE |
127 | return; |
128 | ||
9cfc7bd6 | 129 | /* the interface gets activated here to avoid race conditions between |
c6c8fea2 SE |
130 | * the moment of activating the interface in |
131 | * hardif_activate_interface() where the originator mac is set and | |
132 | * outdated packets (especially uninitialized mac addresses) in the | |
133 | * packet queue | |
134 | */ | |
e9a4f295 SE |
135 | if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) |
136 | hard_iface->if_status = BATADV_IF_ACTIVE; | |
c6c8fea2 | 137 | |
be9aa4c1 | 138 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); |
c6c8fea2 SE |
139 | } |
140 | ||
56303d34 | 141 | static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) |
c6c8fea2 SE |
142 | { |
143 | if (forw_packet->skb) | |
144 | kfree_skb(forw_packet->skb); | |
6d5808d4 | 145 | if (forw_packet->if_incoming) |
e5d89254 | 146 | batadv_hardif_free_ref(forw_packet->if_incoming); |
c6c8fea2 SE |
147 | kfree(forw_packet); |
148 | } | |
149 | ||
56303d34 SE |
150 | static void |
151 | _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, | |
152 | struct batadv_forw_packet *forw_packet, | |
153 | unsigned long send_time) | |
c6c8fea2 SE |
154 | { |
155 | INIT_HLIST_NODE(&forw_packet->list); | |
156 | ||
157 | /* add new packet to packet list */ | |
158 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
159 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); | |
160 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
161 | ||
162 | /* start timer for this packet */ | |
3193e8fd | 163 | queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, |
c6c8fea2 SE |
164 | send_time); |
165 | } | |
166 | ||
c6c8fea2 | 167 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
015758d0 | 168 | * are sent multiple times to increase probability for being received. |
c6c8fea2 SE |
169 | * |
170 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on | |
171 | * errors. | |
172 | * | |
173 | * The skb is not consumed, so the caller should make sure that the | |
9cfc7bd6 SE |
174 | * skb is freed. |
175 | */ | |
56303d34 | 176 | int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, |
9455e34c SE |
177 | const struct sk_buff *skb, |
178 | unsigned long delay) | |
c6c8fea2 | 179 | { |
56303d34 SE |
180 | struct batadv_hard_iface *primary_if = NULL; |
181 | struct batadv_forw_packet *forw_packet; | |
96412690 | 182 | struct batadv_bcast_packet *bcast_packet; |
747e4221 | 183 | struct sk_buff *newskb; |
c6c8fea2 | 184 | |
3e34819e | 185 | if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { |
39c75a51 SE |
186 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
187 | "bcast packet queue full\n"); | |
c6c8fea2 SE |
188 | goto out; |
189 | } | |
190 | ||
e5d89254 | 191 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 192 | if (!primary_if) |
ca06c6eb | 193 | goto out_and_inc; |
c6c8fea2 | 194 | |
704509b8 | 195 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
c6c8fea2 SE |
196 | |
197 | if (!forw_packet) | |
198 | goto out_and_inc; | |
199 | ||
747e4221 SE |
200 | newskb = skb_copy(skb, GFP_ATOMIC); |
201 | if (!newskb) | |
c6c8fea2 SE |
202 | goto packet_free; |
203 | ||
204 | /* as we have a copy now, it is safe to decrease the TTL */ | |
96412690 | 205 | bcast_packet = (struct batadv_bcast_packet *)newskb->data; |
76543d14 | 206 | bcast_packet->header.ttl--; |
c6c8fea2 | 207 | |
747e4221 | 208 | skb_reset_mac_header(newskb); |
c6c8fea2 | 209 | |
747e4221 | 210 | forw_packet->skb = newskb; |
32ae9b22 | 211 | forw_packet->if_incoming = primary_if; |
c6c8fea2 SE |
212 | |
213 | /* how often did we send the bcast packet ? */ | |
214 | forw_packet->num_packets = 0; | |
215 | ||
72414442 AQ |
216 | INIT_DELAYED_WORK(&forw_packet->delayed_work, |
217 | batadv_send_outstanding_bcast_packet); | |
218 | ||
bb079c82 | 219 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
c6c8fea2 SE |
220 | return NETDEV_TX_OK; |
221 | ||
222 | packet_free: | |
223 | kfree(forw_packet); | |
224 | out_and_inc: | |
225 | atomic_inc(&bat_priv->bcast_queue_left); | |
226 | out: | |
32ae9b22 | 227 | if (primary_if) |
e5d89254 | 228 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
229 | return NETDEV_TX_BUSY; |
230 | } | |
231 | ||
bb079c82 | 232 | static void batadv_send_outstanding_bcast_packet(struct work_struct *work) |
c6c8fea2 | 233 | { |
56303d34 | 234 | struct batadv_hard_iface *hard_iface; |
bbb1f90e | 235 | struct delayed_work *delayed_work; |
56303d34 | 236 | struct batadv_forw_packet *forw_packet; |
c6c8fea2 | 237 | struct sk_buff *skb1; |
56303d34 SE |
238 | struct net_device *soft_iface; |
239 | struct batadv_priv *bat_priv; | |
240 | ||
bbb1f90e | 241 | delayed_work = container_of(work, struct delayed_work, work); |
56303d34 SE |
242 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
243 | delayed_work); | |
244 | soft_iface = forw_packet->if_incoming->soft_iface; | |
245 | bat_priv = netdev_priv(soft_iface); | |
c6c8fea2 SE |
246 | |
247 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
248 | hlist_del(&forw_packet->list); | |
249 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
250 | ||
39c75a51 | 251 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
252 | goto out; |
253 | ||
c384ea3e AQ |
254 | if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) |
255 | goto out; | |
256 | ||
c6c8fea2 SE |
257 | /* rebroadcast packet */ |
258 | rcu_read_lock(); | |
3193e8fd | 259 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 260 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
261 | continue; |
262 | ||
263 | /* send a copy of the saved skb */ | |
264 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
265 | if (skb1) | |
9455e34c | 266 | batadv_send_skb_packet(skb1, hard_iface, |
3193e8fd | 267 | batadv_broadcast_addr); |
c6c8fea2 SE |
268 | } |
269 | rcu_read_unlock(); | |
270 | ||
271 | forw_packet->num_packets++; | |
272 | ||
273 | /* if we still have some more bcasts to send */ | |
274 | if (forw_packet->num_packets < 3) { | |
bb079c82 SE |
275 | _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, |
276 | msecs_to_jiffies(5)); | |
c6c8fea2 SE |
277 | return; |
278 | } | |
279 | ||
280 | out: | |
bb079c82 | 281 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
282 | atomic_inc(&bat_priv->bcast_queue_left); |
283 | } | |
284 | ||
9455e34c | 285 | void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) |
c6c8fea2 | 286 | { |
bbb1f90e | 287 | struct delayed_work *delayed_work; |
56303d34 SE |
288 | struct batadv_forw_packet *forw_packet; |
289 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 290 | |
bbb1f90e | 291 | delayed_work = container_of(work, struct delayed_work, work); |
56303d34 SE |
292 | forw_packet = container_of(delayed_work, struct batadv_forw_packet, |
293 | delayed_work); | |
c6c8fea2 SE |
294 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); |
295 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
296 | hlist_del(&forw_packet->list); | |
297 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
298 | ||
39c75a51 | 299 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) |
c6c8fea2 SE |
300 | goto out; |
301 | ||
01c4224b | 302 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
c6c8fea2 | 303 | |
9cfc7bd6 | 304 | /* we have to have at least one packet in the queue |
c6c8fea2 SE |
305 | * to determine the queues wake up time unless we are |
306 | * shutting down | |
307 | */ | |
308 | if (forw_packet->own) | |
9455e34c | 309 | batadv_schedule_bat_ogm(forw_packet->if_incoming); |
c6c8fea2 SE |
310 | |
311 | out: | |
312 | /* don't count own packet */ | |
313 | if (!forw_packet->own) | |
314 | atomic_inc(&bat_priv->batman_queue_left); | |
315 | ||
bb079c82 | 316 | batadv_forw_packet_free(forw_packet); |
c6c8fea2 SE |
317 | } |
318 | ||
56303d34 SE |
319 | void |
320 | batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, | |
321 | const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 322 | { |
56303d34 | 323 | struct batadv_forw_packet *forw_packet; |
b67bfe0d | 324 | struct hlist_node *safe_tmp_node; |
6d5808d4 | 325 | bool pending; |
c6c8fea2 | 326 | |
e6c10f43 | 327 | if (hard_iface) |
39c75a51 | 328 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
329 | "purge_outstanding_packets(): %s\n", |
330 | hard_iface->net_dev->name); | |
c6c8fea2 | 331 | else |
39c75a51 | 332 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 333 | "purge_outstanding_packets()\n"); |
c6c8fea2 SE |
334 | |
335 | /* free bcast list */ | |
336 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
b67bfe0d | 337 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 338 | &bat_priv->forw_bcast_list, list) { |
9cfc7bd6 | 339 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
340 | * we delete only packets belonging to the given interface |
341 | */ | |
e6c10f43 ML |
342 | if ((hard_iface) && |
343 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
344 | continue; |
345 | ||
346 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
347 | ||
bb079c82 | 348 | /* batadv_send_outstanding_bcast_packet() will lock the list to |
c6c8fea2 SE |
349 | * delete the item from the list |
350 | */ | |
6d5808d4 | 351 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 352 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
6d5808d4 SE |
353 | |
354 | if (pending) { | |
355 | hlist_del(&forw_packet->list); | |
bb079c82 | 356 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 357 | } |
c6c8fea2 SE |
358 | } |
359 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
360 | ||
361 | /* free batman packet list */ | |
362 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
b67bfe0d | 363 | hlist_for_each_entry_safe(forw_packet, safe_tmp_node, |
c6c8fea2 | 364 | &bat_priv->forw_bat_list, list) { |
9cfc7bd6 | 365 | /* if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
366 | * we delete only packets belonging to the given interface |
367 | */ | |
e6c10f43 ML |
368 | if ((hard_iface) && |
369 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
370 | continue; |
371 | ||
372 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
373 | ||
9cfc7bd6 | 374 | /* send_outstanding_bat_packet() will lock the list to |
c6c8fea2 SE |
375 | * delete the item from the list |
376 | */ | |
6d5808d4 | 377 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 378 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
6d5808d4 SE |
379 | |
380 | if (pending) { | |
381 | hlist_del(&forw_packet->list); | |
bb079c82 | 382 | batadv_forw_packet_free(forw_packet); |
6d5808d4 | 383 | } |
c6c8fea2 SE |
384 | } |
385 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
386 | } |