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c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "send.h" | |
24 | #include "routing.h" | |
25 | #include "translation-table.h" | |
26 | #include "soft-interface.h" | |
27 | #include "hard-interface.h" | |
c6c8fea2 | 28 | #include "vis.h" |
c6c8fea2 SE |
29 | #include "gateway_common.h" |
30 | #include "originator.h" | |
31 | ||
32 | static void send_outstanding_bcast_packet(struct work_struct *work); | |
33 | ||
c6c8fea2 SE |
34 | /* send out an already prepared packet to the given address via the |
35 | * specified batman interface */ | |
747e4221 SE |
36 | int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface, |
37 | const uint8_t *dst_addr) | |
c6c8fea2 SE |
38 | { |
39 | struct ethhdr *ethhdr; | |
40 | ||
e6c10f43 | 41 | if (hard_iface->if_status != IF_ACTIVE) |
c6c8fea2 SE |
42 | goto send_skb_err; |
43 | ||
e6c10f43 | 44 | if (unlikely(!hard_iface->net_dev)) |
c6c8fea2 SE |
45 | goto send_skb_err; |
46 | ||
e6c10f43 | 47 | if (!(hard_iface->net_dev->flags & IFF_UP)) { |
86ceb360 SE |
48 | pr_warning("Interface %s is not up - can't send packet via that interface!\n", |
49 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
50 | goto send_skb_err; |
51 | } | |
52 | ||
53 | /* push to the ethernet header. */ | |
704509b8 | 54 | if (my_skb_head_push(skb, sizeof(*ethhdr)) < 0) |
c6c8fea2 SE |
55 | goto send_skb_err; |
56 | ||
57 | skb_reset_mac_header(skb); | |
58 | ||
59 | ethhdr = (struct ethhdr *) skb_mac_header(skb); | |
e6c10f43 | 60 | memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 SE |
61 | memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); |
62 | ethhdr->h_proto = __constant_htons(ETH_P_BATMAN); | |
63 | ||
64 | skb_set_network_header(skb, ETH_HLEN); | |
65 | skb->priority = TC_PRIO_CONTROL; | |
66 | skb->protocol = __constant_htons(ETH_P_BATMAN); | |
67 | ||
e6c10f43 | 68 | skb->dev = hard_iface->net_dev; |
c6c8fea2 SE |
69 | |
70 | /* dev_queue_xmit() returns a negative result on error. However on | |
71 | * congestion and traffic shaping, it drops and returns NET_XMIT_DROP | |
72 | * (which is > 0). This will not be treated as an error. */ | |
73 | ||
74 | return dev_queue_xmit(skb); | |
75 | send_skb_err: | |
76 | kfree_skb(skb); | |
77 | return NET_XMIT_DROP; | |
78 | } | |
79 | ||
a73105b8 | 80 | static void realloc_packet_buffer(struct hard_iface *hard_iface, |
b6da4bf5 | 81 | int new_len) |
c6c8fea2 | 82 | { |
c6c8fea2 | 83 | unsigned char *new_buff; |
c6c8fea2 | 84 | |
c6c8fea2 SE |
85 | new_buff = kmalloc(new_len, GFP_ATOMIC); |
86 | ||
87 | /* keep old buffer if kmalloc should fail */ | |
88 | if (new_buff) { | |
e6c10f43 | 89 | memcpy(new_buff, hard_iface->packet_buff, |
b6da4bf5 | 90 | BATMAN_OGM_LEN); |
c6c8fea2 | 91 | |
e6c10f43 ML |
92 | kfree(hard_iface->packet_buff); |
93 | hard_iface->packet_buff = new_buff; | |
94 | hard_iface->packet_len = new_len; | |
c6c8fea2 SE |
95 | } |
96 | } | |
97 | ||
a73105b8 | 98 | /* when calling this function (hard_iface == primary_if) has to be true */ |
b9dacc52 | 99 | static int prepare_packet_buffer(struct bat_priv *bat_priv, |
a73105b8 AQ |
100 | struct hard_iface *hard_iface) |
101 | { | |
102 | int new_len; | |
a73105b8 | 103 | |
b6da4bf5 | 104 | new_len = BATMAN_OGM_LEN + |
a73105b8 AQ |
105 | tt_len((uint8_t)atomic_read(&bat_priv->tt_local_changes)); |
106 | ||
107 | /* if we have too many changes for one packet don't send any | |
108 | * and wait for the tt table request which will be fragmented */ | |
109 | if (new_len > hard_iface->soft_iface->mtu) | |
b6da4bf5 | 110 | new_len = BATMAN_OGM_LEN; |
a73105b8 AQ |
111 | |
112 | realloc_packet_buffer(hard_iface, new_len); | |
a73105b8 AQ |
113 | |
114 | atomic_set(&bat_priv->tt_crc, tt_local_crc(bat_priv)); | |
115 | ||
116 | /* reset the sending counter */ | |
117 | atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX); | |
118 | ||
b9dacc52 ML |
119 | return tt_changes_fill_buffer(bat_priv, |
120 | hard_iface->packet_buff + BATMAN_OGM_LEN, | |
121 | hard_iface->packet_len - BATMAN_OGM_LEN); | |
a73105b8 AQ |
122 | } |
123 | ||
b9dacc52 | 124 | static int reset_packet_buffer(struct bat_priv *bat_priv, |
b6da4bf5 | 125 | struct hard_iface *hard_iface) |
a73105b8 | 126 | { |
b6da4bf5 | 127 | realloc_packet_buffer(hard_iface, BATMAN_OGM_LEN); |
b9dacc52 | 128 | return 0; |
a73105b8 AQ |
129 | } |
130 | ||
b9dacc52 | 131 | void schedule_bat_ogm(struct hard_iface *hard_iface) |
c6c8fea2 | 132 | { |
e6c10f43 | 133 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
32ae9b22 | 134 | struct hard_iface *primary_if; |
b9dacc52 | 135 | int tt_num_changes = -1; |
c6c8fea2 | 136 | |
e6c10f43 ML |
137 | if ((hard_iface->if_status == IF_NOT_IN_USE) || |
138 | (hard_iface->if_status == IF_TO_BE_REMOVED)) | |
c6c8fea2 SE |
139 | return; |
140 | ||
c6c8fea2 SE |
141 | /** |
142 | * the interface gets activated here to avoid race conditions between | |
143 | * the moment of activating the interface in | |
144 | * hardif_activate_interface() where the originator mac is set and | |
145 | * outdated packets (especially uninitialized mac addresses) in the | |
146 | * packet queue | |
147 | */ | |
e6c10f43 ML |
148 | if (hard_iface->if_status == IF_TO_BE_ACTIVATED) |
149 | hard_iface->if_status = IF_ACTIVE; | |
c6c8fea2 | 150 | |
b9dacc52 ML |
151 | primary_if = primary_if_get_selected(bat_priv); |
152 | ||
a73105b8 AQ |
153 | if (hard_iface == primary_if) { |
154 | /* if at least one change happened */ | |
155 | if (atomic_read(&bat_priv->tt_local_changes) > 0) { | |
058d0e26 | 156 | tt_commit_changes(bat_priv); |
b9dacc52 ML |
157 | tt_num_changes = prepare_packet_buffer(bat_priv, |
158 | hard_iface); | |
a73105b8 AQ |
159 | } |
160 | ||
015758d0 | 161 | /* if the changes have been sent often enough */ |
a73105b8 | 162 | if (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt)) |
b9dacc52 ML |
163 | tt_num_changes = reset_packet_buffer(bat_priv, |
164 | hard_iface); | |
a73105b8 | 165 | } |
c6c8fea2 | 166 | |
32ae9b22 ML |
167 | if (primary_if) |
168 | hardif_free_ref(primary_if); | |
c6c8fea2 | 169 | |
01c4224b | 170 | bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface, tt_num_changes); |
c6c8fea2 SE |
171 | } |
172 | ||
173 | static void forw_packet_free(struct forw_packet *forw_packet) | |
174 | { | |
175 | if (forw_packet->skb) | |
176 | kfree_skb(forw_packet->skb); | |
6d5808d4 SE |
177 | if (forw_packet->if_incoming) |
178 | hardif_free_ref(forw_packet->if_incoming); | |
c6c8fea2 SE |
179 | kfree(forw_packet); |
180 | } | |
181 | ||
182 | static void _add_bcast_packet_to_list(struct bat_priv *bat_priv, | |
183 | struct forw_packet *forw_packet, | |
184 | unsigned long send_time) | |
185 | { | |
186 | INIT_HLIST_NODE(&forw_packet->list); | |
187 | ||
188 | /* add new packet to packet list */ | |
189 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
190 | hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); | |
191 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
192 | ||
193 | /* start timer for this packet */ | |
194 | INIT_DELAYED_WORK(&forw_packet->delayed_work, | |
195 | send_outstanding_bcast_packet); | |
196 | queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work, | |
197 | send_time); | |
198 | } | |
199 | ||
c6c8fea2 | 200 | /* add a broadcast packet to the queue and setup timers. broadcast packets |
015758d0 | 201 | * are sent multiple times to increase probability for being received. |
c6c8fea2 SE |
202 | * |
203 | * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on | |
204 | * errors. | |
205 | * | |
206 | * The skb is not consumed, so the caller should make sure that the | |
207 | * skb is freed. */ | |
747e4221 | 208 | int add_bcast_packet_to_list(struct bat_priv *bat_priv, |
8698529d | 209 | const struct sk_buff *skb, unsigned long delay) |
c6c8fea2 | 210 | { |
32ae9b22 | 211 | struct hard_iface *primary_if = NULL; |
c6c8fea2 SE |
212 | struct forw_packet *forw_packet; |
213 | struct bcast_packet *bcast_packet; | |
747e4221 | 214 | struct sk_buff *newskb; |
c6c8fea2 SE |
215 | |
216 | if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { | |
217 | bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n"); | |
218 | goto out; | |
219 | } | |
220 | ||
32ae9b22 ML |
221 | primary_if = primary_if_get_selected(bat_priv); |
222 | if (!primary_if) | |
ca06c6eb | 223 | goto out_and_inc; |
c6c8fea2 | 224 | |
704509b8 | 225 | forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); |
c6c8fea2 SE |
226 | |
227 | if (!forw_packet) | |
228 | goto out_and_inc; | |
229 | ||
747e4221 SE |
230 | newskb = skb_copy(skb, GFP_ATOMIC); |
231 | if (!newskb) | |
c6c8fea2 SE |
232 | goto packet_free; |
233 | ||
234 | /* as we have a copy now, it is safe to decrease the TTL */ | |
747e4221 | 235 | bcast_packet = (struct bcast_packet *)newskb->data; |
76543d14 | 236 | bcast_packet->header.ttl--; |
c6c8fea2 | 237 | |
747e4221 | 238 | skb_reset_mac_header(newskb); |
c6c8fea2 | 239 | |
747e4221 | 240 | forw_packet->skb = newskb; |
32ae9b22 | 241 | forw_packet->if_incoming = primary_if; |
c6c8fea2 SE |
242 | |
243 | /* how often did we send the bcast packet ? */ | |
244 | forw_packet->num_packets = 0; | |
245 | ||
8698529d | 246 | _add_bcast_packet_to_list(bat_priv, forw_packet, delay); |
c6c8fea2 SE |
247 | return NETDEV_TX_OK; |
248 | ||
249 | packet_free: | |
250 | kfree(forw_packet); | |
251 | out_and_inc: | |
252 | atomic_inc(&bat_priv->bcast_queue_left); | |
253 | out: | |
32ae9b22 ML |
254 | if (primary_if) |
255 | hardif_free_ref(primary_if); | |
c6c8fea2 SE |
256 | return NETDEV_TX_BUSY; |
257 | } | |
258 | ||
259 | static void send_outstanding_bcast_packet(struct work_struct *work) | |
260 | { | |
e6c10f43 | 261 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
262 | struct delayed_work *delayed_work = |
263 | container_of(work, struct delayed_work, work); | |
264 | struct forw_packet *forw_packet = | |
265 | container_of(delayed_work, struct forw_packet, delayed_work); | |
266 | struct sk_buff *skb1; | |
267 | struct net_device *soft_iface = forw_packet->if_incoming->soft_iface; | |
268 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
269 | ||
270 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
271 | hlist_del(&forw_packet->list); | |
272 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
273 | ||
274 | if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) | |
275 | goto out; | |
276 | ||
277 | /* rebroadcast packet */ | |
278 | rcu_read_lock(); | |
e6c10f43 ML |
279 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
280 | if (hard_iface->soft_iface != soft_iface) | |
c6c8fea2 SE |
281 | continue; |
282 | ||
283 | /* send a copy of the saved skb */ | |
284 | skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
285 | if (skb1) | |
e6c10f43 | 286 | send_skb_packet(skb1, hard_iface, broadcast_addr); |
c6c8fea2 SE |
287 | } |
288 | rcu_read_unlock(); | |
289 | ||
290 | forw_packet->num_packets++; | |
291 | ||
292 | /* if we still have some more bcasts to send */ | |
293 | if (forw_packet->num_packets < 3) { | |
294 | _add_bcast_packet_to_list(bat_priv, forw_packet, | |
295 | ((5 * HZ) / 1000)); | |
296 | return; | |
297 | } | |
298 | ||
299 | out: | |
300 | forw_packet_free(forw_packet); | |
301 | atomic_inc(&bat_priv->bcast_queue_left); | |
302 | } | |
303 | ||
b9dacc52 | 304 | void send_outstanding_bat_ogm_packet(struct work_struct *work) |
c6c8fea2 SE |
305 | { |
306 | struct delayed_work *delayed_work = | |
307 | container_of(work, struct delayed_work, work); | |
308 | struct forw_packet *forw_packet = | |
309 | container_of(delayed_work, struct forw_packet, delayed_work); | |
310 | struct bat_priv *bat_priv; | |
311 | ||
312 | bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); | |
313 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
314 | hlist_del(&forw_packet->list); | |
315 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
316 | ||
317 | if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING) | |
318 | goto out; | |
319 | ||
01c4224b | 320 | bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); |
c6c8fea2 SE |
321 | |
322 | /** | |
323 | * we have to have at least one packet in the queue | |
324 | * to determine the queues wake up time unless we are | |
325 | * shutting down | |
326 | */ | |
327 | if (forw_packet->own) | |
b9dacc52 | 328 | schedule_bat_ogm(forw_packet->if_incoming); |
c6c8fea2 SE |
329 | |
330 | out: | |
331 | /* don't count own packet */ | |
332 | if (!forw_packet->own) | |
333 | atomic_inc(&bat_priv->batman_queue_left); | |
334 | ||
335 | forw_packet_free(forw_packet); | |
336 | } | |
337 | ||
338 | void purge_outstanding_packets(struct bat_priv *bat_priv, | |
747e4221 | 339 | const struct hard_iface *hard_iface) |
c6c8fea2 SE |
340 | { |
341 | struct forw_packet *forw_packet; | |
342 | struct hlist_node *tmp_node, *safe_tmp_node; | |
6d5808d4 | 343 | bool pending; |
c6c8fea2 | 344 | |
e6c10f43 | 345 | if (hard_iface) |
c6c8fea2 SE |
346 | bat_dbg(DBG_BATMAN, bat_priv, |
347 | "purge_outstanding_packets(): %s\n", | |
e6c10f43 | 348 | hard_iface->net_dev->name); |
c6c8fea2 SE |
349 | else |
350 | bat_dbg(DBG_BATMAN, bat_priv, | |
351 | "purge_outstanding_packets()\n"); | |
352 | ||
353 | /* free bcast list */ | |
354 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); | |
355 | hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, | |
356 | &bat_priv->forw_bcast_list, list) { | |
357 | ||
358 | /** | |
015758d0 | 359 | * if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
360 | * we delete only packets belonging to the given interface |
361 | */ | |
e6c10f43 ML |
362 | if ((hard_iface) && |
363 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
364 | continue; |
365 | ||
366 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
367 | ||
368 | /** | |
369 | * send_outstanding_bcast_packet() will lock the list to | |
370 | * delete the item from the list | |
371 | */ | |
6d5808d4 | 372 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 373 | spin_lock_bh(&bat_priv->forw_bcast_list_lock); |
6d5808d4 SE |
374 | |
375 | if (pending) { | |
376 | hlist_del(&forw_packet->list); | |
377 | forw_packet_free(forw_packet); | |
378 | } | |
c6c8fea2 SE |
379 | } |
380 | spin_unlock_bh(&bat_priv->forw_bcast_list_lock); | |
381 | ||
382 | /* free batman packet list */ | |
383 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
384 | hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node, | |
385 | &bat_priv->forw_bat_list, list) { | |
386 | ||
387 | /** | |
015758d0 | 388 | * if purge_outstanding_packets() was called with an argument |
c6c8fea2 SE |
389 | * we delete only packets belonging to the given interface |
390 | */ | |
e6c10f43 ML |
391 | if ((hard_iface) && |
392 | (forw_packet->if_incoming != hard_iface)) | |
c6c8fea2 SE |
393 | continue; |
394 | ||
395 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
396 | ||
397 | /** | |
398 | * send_outstanding_bat_packet() will lock the list to | |
399 | * delete the item from the list | |
400 | */ | |
6d5808d4 | 401 | pending = cancel_delayed_work_sync(&forw_packet->delayed_work); |
c6c8fea2 | 402 | spin_lock_bh(&bat_priv->forw_bat_list_lock); |
6d5808d4 SE |
403 | |
404 | if (pending) { | |
405 | hlist_del(&forw_packet->list); | |
406 | forw_packet_free(forw_packet); | |
407 | } | |
c6c8fea2 SE |
408 | } |
409 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
410 | } |