Commit | Line | Data |
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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
fc957275 ML |
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 | |
fc957275 ML |
18 | */ |
19 | ||
20 | #include "main.h" | |
fc957275 ML |
21 | #include "translation-table.h" |
22 | #include "ring_buffer.h" | |
23 | #include "originator.h" | |
24 | #include "routing.h" | |
25 | #include "gateway_common.h" | |
26 | #include "gateway_client.h" | |
27 | #include "hard-interface.h" | |
28 | #include "send.h" | |
1c280471 | 29 | #include "bat_algo.h" |
fc957275 | 30 | |
fe8bc396 SE |
31 | static struct neigh_node *batadv_iv_ogm_neigh_new(struct hard_iface *hard_iface, |
32 | const uint8_t *neigh_addr, | |
33 | struct orig_node *orig_node, | |
34 | struct orig_node *orig_neigh, | |
35 | __be32 seqno) | |
7ae8b285 ML |
36 | { |
37 | struct neigh_node *neigh_node; | |
38 | ||
e0f5211f AV |
39 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, |
40 | ntohl(seqno)); | |
7ae8b285 ML |
41 | if (!neigh_node) |
42 | goto out; | |
43 | ||
44 | INIT_LIST_HEAD(&neigh_node->bonding_list); | |
7ae8b285 ML |
45 | |
46 | neigh_node->orig_node = orig_neigh; | |
47 | neigh_node->if_incoming = hard_iface; | |
48 | ||
49 | spin_lock_bh(&orig_node->neigh_list_lock); | |
50 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
51 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
52 | ||
53 | out: | |
54 | return neigh_node; | |
55 | } | |
56 | ||
fe8bc396 | 57 | static int batadv_iv_ogm_iface_enable(struct hard_iface *hard_iface) |
d0b9fd89 ML |
58 | { |
59 | struct batman_ogm_packet *batman_ogm_packet; | |
d7d32ec0 | 60 | uint32_t random_seqno; |
5346c35e | 61 | int res = -ENOMEM; |
d7d32ec0 ML |
62 | |
63 | /* randomize initial seqno to avoid collision */ | |
64 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
65 | atomic_set(&hard_iface->seqno, random_seqno); | |
d0b9fd89 | 66 | |
7e071c79 | 67 | hard_iface->packet_len = BATADV_OGM_HLEN; |
d0b9fd89 ML |
68 | hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC); |
69 | ||
77af7575 ML |
70 | if (!hard_iface->packet_buff) |
71 | goto out; | |
72 | ||
d0b9fd89 | 73 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; |
1eeb479f | 74 | batman_ogm_packet->header.packet_type = BAT_IV_OGM; |
7e071c79 | 75 | batman_ogm_packet->header.version = BATADV_COMPAT_VERSION; |
76543d14 | 76 | batman_ogm_packet->header.ttl = 2; |
42d0b044 SE |
77 | batman_ogm_packet->flags = BATADV_NO_FLAGS; |
78 | batman_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
d0b9fd89 ML |
79 | batman_ogm_packet->tt_num_changes = 0; |
80 | batman_ogm_packet->ttvn = 0; | |
77af7575 ML |
81 | |
82 | res = 0; | |
83 | ||
84 | out: | |
85 | return res; | |
d0b9fd89 ML |
86 | } |
87 | ||
fe8bc396 | 88 | static void batadv_iv_ogm_iface_disable(struct hard_iface *hard_iface) |
00a50076 ML |
89 | { |
90 | kfree(hard_iface->packet_buff); | |
91 | hard_iface->packet_buff = NULL; | |
92 | } | |
93 | ||
fe8bc396 | 94 | static void batadv_iv_ogm_iface_update_mac(struct hard_iface *hard_iface) |
d0b9fd89 ML |
95 | { |
96 | struct batman_ogm_packet *batman_ogm_packet; | |
97 | ||
98 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; | |
c3229398 ML |
99 | memcpy(batman_ogm_packet->orig, |
100 | hard_iface->net_dev->dev_addr, ETH_ALEN); | |
101 | memcpy(batman_ogm_packet->prev_sender, | |
102 | hard_iface->net_dev->dev_addr, ETH_ALEN); | |
d0b9fd89 ML |
103 | } |
104 | ||
fe8bc396 | 105 | static void batadv_iv_ogm_primary_iface_set(struct hard_iface *hard_iface) |
d0b9fd89 ML |
106 | { |
107 | struct batman_ogm_packet *batman_ogm_packet; | |
108 | ||
109 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; | |
c3229398 | 110 | batman_ogm_packet->flags = PRIMARIES_FIRST_HOP; |
42d0b044 | 111 | batman_ogm_packet->header.ttl = BATADV_TTL; |
d0b9fd89 ML |
112 | } |
113 | ||
b9dacc52 | 114 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 SE |
115 | static unsigned long |
116 | batadv_iv_ogm_emit_send_time(const struct bat_priv *bat_priv) | |
b9dacc52 | 117 | { |
42d0b044 SE |
118 | unsigned int msecs; |
119 | ||
120 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
121 | msecs += (random32() % 2 * BATADV_JITTER); | |
122 | ||
123 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
124 | } |
125 | ||
126 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 127 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 128 | { |
42d0b044 | 129 | return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
130 | } |
131 | ||
132 | /* apply hop penalty for a normal link */ | |
fe8bc396 | 133 | static uint8_t batadv_hop_penalty(uint8_t tq, const struct bat_priv *bat_priv) |
b9dacc52 ML |
134 | { |
135 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
136 | int new_tq; |
137 | ||
138 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
139 | new_tq /= BATADV_TQ_MAX_VALUE; | |
140 | ||
141 | return new_tq; | |
b9dacc52 ML |
142 | } |
143 | ||
fc957275 | 144 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
145 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
146 | int tt_num_changes) | |
fc957275 | 147 | { |
08c36d3e SE |
148 | int next_buff_pos = 0; |
149 | ||
7e071c79 | 150 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 151 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
152 | |
153 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 154 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
155 | } |
156 | ||
b9dacc52 | 157 | /* send a batman ogm to a given interface */ |
fe8bc396 | 158 | static void batadv_iv_ogm_send_to_if(struct forw_packet *forw_packet, |
01c4224b | 159 | struct hard_iface *hard_iface) |
b9dacc52 ML |
160 | { |
161 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
162 | char *fwd_str; | |
163 | uint8_t packet_num; | |
164 | int16_t buff_pos; | |
165 | struct batman_ogm_packet *batman_ogm_packet; | |
166 | struct sk_buff *skb; | |
167 | ||
e9a4f295 | 168 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
169 | return; |
170 | ||
171 | packet_num = 0; | |
172 | buff_pos = 0; | |
173 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
174 | ||
175 | /* adjust all flags and log packets */ | |
fe8bc396 SE |
176 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
177 | batman_ogm_packet->tt_num_changes)) { | |
b9dacc52 ML |
178 | |
179 | /* we might have aggregated direct link packets with an | |
9cfc7bd6 SE |
180 | * ordinary base packet |
181 | */ | |
b9dacc52 ML |
182 | if ((forw_packet->direct_link_flags & (1 << packet_num)) && |
183 | (forw_packet->if_incoming == hard_iface)) | |
184 | batman_ogm_packet->flags |= DIRECTLINK; | |
185 | else | |
186 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
187 | ||
188 | fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? | |
189 | "Sending own" : | |
190 | "Forwarding")); | |
1eda58bf SE |
191 | batadv_dbg(DBG_BATMAN, bat_priv, |
192 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", | |
193 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
194 | batman_ogm_packet->orig, | |
195 | ntohl(batman_ogm_packet->seqno), | |
196 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl, | |
197 | (batman_ogm_packet->flags & DIRECTLINK ? | |
198 | "on" : "off"), | |
199 | batman_ogm_packet->ttvn, hard_iface->net_dev->name, | |
200 | hard_iface->net_dev->dev_addr); | |
b9dacc52 | 201 | |
7e071c79 | 202 | buff_pos += BATADV_OGM_HLEN; |
08c36d3e | 203 | buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes); |
b9dacc52 ML |
204 | packet_num++; |
205 | batman_ogm_packet = (struct batman_ogm_packet *) | |
206 | (forw_packet->skb->data + buff_pos); | |
207 | } | |
208 | ||
209 | /* create clone because function is called more than once */ | |
210 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 211 | if (skb) { |
d69909d2 SE |
212 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
213 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 214 | skb->len + ETH_HLEN); |
3193e8fd | 215 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 216 | } |
b9dacc52 ML |
217 | } |
218 | ||
219 | /* send a batman ogm packet */ | |
fe8bc396 | 220 | static void batadv_iv_ogm_emit(struct forw_packet *forw_packet) |
b9dacc52 ML |
221 | { |
222 | struct hard_iface *hard_iface; | |
223 | struct net_device *soft_iface; | |
224 | struct bat_priv *bat_priv; | |
225 | struct hard_iface *primary_if = NULL; | |
226 | struct batman_ogm_packet *batman_ogm_packet; | |
227 | unsigned char directlink; | |
228 | ||
229 | batman_ogm_packet = (struct batman_ogm_packet *) | |
230 | (forw_packet->skb->data); | |
231 | directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
232 | ||
233 | if (!forw_packet->if_incoming) { | |
86ceb360 | 234 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
235 | goto out; |
236 | } | |
237 | ||
238 | soft_iface = forw_packet->if_incoming->soft_iface; | |
239 | bat_priv = netdev_priv(soft_iface); | |
240 | ||
e9a4f295 | 241 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
242 | goto out; |
243 | ||
e5d89254 | 244 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
245 | if (!primary_if) |
246 | goto out; | |
247 | ||
9cfc7bd6 SE |
248 | /* multihomed peer assumed |
249 | * non-primary OGMs are only broadcasted on their interface | |
250 | */ | |
76543d14 | 251 | if ((directlink && (batman_ogm_packet->header.ttl == 1)) || |
b9dacc52 ML |
252 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
253 | ||
254 | /* FIXME: what about aggregated packets ? */ | |
1eda58bf SE |
255 | batadv_dbg(DBG_BATMAN, bat_priv, |
256 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", | |
257 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
258 | batman_ogm_packet->orig, | |
259 | ntohl(batman_ogm_packet->seqno), | |
260 | batman_ogm_packet->header.ttl, | |
261 | forw_packet->if_incoming->net_dev->name, | |
262 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
263 | |
264 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
265 | batadv_send_skb_packet(forw_packet->skb, |
266 | forw_packet->if_incoming, | |
3193e8fd | 267 | batadv_broadcast_addr); |
b9dacc52 ML |
268 | forw_packet->skb = NULL; |
269 | ||
270 | goto out; | |
271 | } | |
272 | ||
273 | /* broadcast on every interface */ | |
274 | rcu_read_lock(); | |
3193e8fd | 275 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
276 | if (hard_iface->soft_iface != soft_iface) |
277 | continue; | |
278 | ||
fe8bc396 | 279 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
280 | } |
281 | rcu_read_unlock(); | |
282 | ||
283 | out: | |
284 | if (primary_if) | |
e5d89254 | 285 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
286 | } |
287 | ||
288 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 SE |
289 | static bool |
290 | batadv_iv_ogm_can_aggregate(const struct batman_ogm_packet *new_bat_ogm_packet, | |
291 | struct bat_priv *bat_priv, | |
292 | int packet_len, unsigned long send_time, | |
293 | bool directlink, | |
294 | const struct hard_iface *if_incoming, | |
295 | const struct forw_packet *forw_packet) | |
b9dacc52 ML |
296 | { |
297 | struct batman_ogm_packet *batman_ogm_packet; | |
298 | int aggregated_bytes = forw_packet->packet_len + packet_len; | |
299 | struct hard_iface *primary_if = NULL; | |
300 | bool res = false; | |
42d0b044 | 301 | unsigned long aggregation_end_time; |
b9dacc52 ML |
302 | |
303 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
42d0b044 SE |
304 | aggregation_end_time = send_time; |
305 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 306 | |
9cfc7bd6 | 307 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
308 | * if: |
309 | * | |
310 | * - the send time is within our MAX_AGGREGATION_MS time | |
311 | * - the resulting packet wont be bigger than | |
312 | * MAX_AGGREGATION_BYTES | |
313 | */ | |
b9dacc52 | 314 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
315 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
316 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
b9dacc52 | 317 | |
9cfc7bd6 | 318 | /* check aggregation compatibility |
b9dacc52 ML |
319 | * -> direct link packets are broadcasted on |
320 | * their interface only | |
321 | * -> aggregate packet if the current packet is | |
322 | * a "global" packet as well as the base | |
323 | * packet | |
324 | */ | |
e5d89254 | 325 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
326 | if (!primary_if) |
327 | goto out; | |
328 | ||
329 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
330 | * are flooded through the net |
331 | */ | |
b9dacc52 ML |
332 | if ((!directlink) && |
333 | (!(batman_ogm_packet->flags & DIRECTLINK)) && | |
76543d14 | 334 | (batman_ogm_packet->header.ttl != 1) && |
b9dacc52 ML |
335 | |
336 | /* own packets originating non-primary | |
9cfc7bd6 SE |
337 | * interfaces leave only that interface |
338 | */ | |
b9dacc52 ML |
339 | ((!forw_packet->own) || |
340 | (forw_packet->if_incoming == primary_if))) { | |
341 | res = true; | |
342 | goto out; | |
343 | } | |
344 | ||
345 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
346 | * interface only - we still can aggregate |
347 | */ | |
b9dacc52 | 348 | if ((directlink) && |
fe8bc396 | 349 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
350 | (forw_packet->if_incoming == if_incoming) && |
351 | ||
352 | /* packets from direct neighbors or | |
353 | * own secondary interface packets | |
9cfc7bd6 SE |
354 | * (= secondary interface packets in general) |
355 | */ | |
b9dacc52 ML |
356 | (batman_ogm_packet->flags & DIRECTLINK || |
357 | (forw_packet->own && | |
358 | forw_packet->if_incoming != primary_if))) { | |
359 | res = true; | |
360 | goto out; | |
361 | } | |
362 | } | |
363 | ||
364 | out: | |
365 | if (primary_if) | |
e5d89254 | 366 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
367 | return res; |
368 | } | |
369 | ||
370 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
371 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
372 | int packet_len, unsigned long send_time, | |
373 | bool direct_link, | |
374 | struct hard_iface *if_incoming, | |
375 | int own_packet) | |
b9dacc52 ML |
376 | { |
377 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
378 | struct forw_packet *forw_packet_aggr; | |
379 | unsigned char *skb_buff; | |
42d0b044 | 380 | unsigned int skb_size; |
b9dacc52 ML |
381 | |
382 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
383 | return; | |
384 | ||
385 | /* own packet should always be scheduled */ | |
386 | if (!own_packet) { | |
3e34819e | 387 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
1eda58bf SE |
388 | batadv_dbg(DBG_BATMAN, bat_priv, |
389 | "batman packet queue full\n"); | |
b9dacc52 ML |
390 | goto out; |
391 | } | |
392 | } | |
393 | ||
394 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
395 | if (!forw_packet_aggr) { | |
396 | if (!own_packet) | |
397 | atomic_inc(&bat_priv->batman_queue_left); | |
398 | goto out; | |
399 | } | |
400 | ||
401 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 SE |
402 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
403 | skb_size = BATADV_MAX_AGGREGATION_BYTES + ETH_HLEN; | |
b9dacc52 | 404 | else |
42d0b044 | 405 | skb_size = packet_len + ETH_HLEN; |
b9dacc52 | 406 | |
42d0b044 | 407 | forw_packet_aggr->skb = dev_alloc_skb(skb_size); |
b9dacc52 ML |
408 | if (!forw_packet_aggr->skb) { |
409 | if (!own_packet) | |
410 | atomic_inc(&bat_priv->batman_queue_left); | |
411 | kfree(forw_packet_aggr); | |
412 | goto out; | |
413 | } | |
0d125074 | 414 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 ML |
415 | |
416 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
417 | ||
418 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
419 | forw_packet_aggr->packet_len = packet_len; | |
420 | memcpy(skb_buff, packet_buff, packet_len); | |
421 | ||
422 | forw_packet_aggr->own = own_packet; | |
423 | forw_packet_aggr->if_incoming = if_incoming; | |
424 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 425 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
426 | forw_packet_aggr->send_time = send_time; |
427 | ||
428 | /* save packet direct link flag status */ | |
429 | if (direct_link) | |
430 | forw_packet_aggr->direct_link_flags |= 1; | |
431 | ||
432 | /* add new packet to packet list */ | |
433 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
434 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
435 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
436 | ||
437 | /* start timer for this packet */ | |
438 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 439 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 440 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
441 | &forw_packet_aggr->delayed_work, |
442 | send_time - jiffies); | |
443 | ||
444 | return; | |
445 | out: | |
e5d89254 | 446 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
447 | } |
448 | ||
449 | /* aggregate a new packet into the existing ogm packet */ | |
fe8bc396 SE |
450 | static void batadv_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr, |
451 | const unsigned char *packet_buff, | |
452 | int packet_len, bool direct_link) | |
b9dacc52 ML |
453 | { |
454 | unsigned char *skb_buff; | |
455 | ||
456 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
457 | memcpy(skb_buff, packet_buff, packet_len); | |
458 | forw_packet_aggr->packet_len += packet_len; | |
459 | forw_packet_aggr->num_packets++; | |
460 | ||
461 | /* save packet direct link flag status */ | |
462 | if (direct_link) | |
463 | forw_packet_aggr->direct_link_flags |= | |
464 | (1 << forw_packet_aggr->num_packets); | |
465 | } | |
466 | ||
fe8bc396 SE |
467 | static void batadv_iv_ogm_queue_add(struct bat_priv *bat_priv, |
468 | unsigned char *packet_buff, | |
469 | int packet_len, | |
470 | struct hard_iface *if_incoming, | |
471 | int own_packet, unsigned long send_time) | |
b9dacc52 | 472 | { |
9cfc7bd6 | 473 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
474 | * _pos -> pointer to the position in the queue |
475 | */ | |
476 | struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL; | |
477 | struct hlist_node *tmp_node; | |
478 | struct batman_ogm_packet *batman_ogm_packet; | |
479 | bool direct_link; | |
42d0b044 | 480 | unsigned long max_aggregation_jiffies; |
b9dacc52 ML |
481 | |
482 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; | |
483 | direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0; | |
42d0b044 | 484 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
485 | |
486 | /* find position for the packet in the forward queue */ | |
487 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
488 | /* own packets are not to be aggregated */ | |
489 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
490 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
491 | &bat_priv->forw_bat_list, list) { | |
fe8bc396 SE |
492 | if (batadv_iv_ogm_can_aggregate(batman_ogm_packet, |
493 | bat_priv, packet_len, | |
494 | send_time, direct_link, | |
495 | if_incoming, | |
496 | forw_packet_pos)) { | |
b9dacc52 ML |
497 | forw_packet_aggr = forw_packet_pos; |
498 | break; | |
499 | } | |
500 | } | |
501 | } | |
502 | ||
503 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
504 | * suitable aggregation packet found |
505 | */ | |
b9dacc52 ML |
506 | if (!forw_packet_aggr) { |
507 | /* the following section can run without the lock */ | |
508 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
509 | ||
9cfc7bd6 | 510 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
511 | * we hold it back for a while, so that it might be aggregated |
512 | * later on | |
513 | */ | |
42d0b044 SE |
514 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
515 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 516 | |
fe8bc396 SE |
517 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
518 | send_time, direct_link, | |
519 | if_incoming, own_packet); | |
b9dacc52 | 520 | } else { |
fe8bc396 SE |
521 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
522 | packet_len, direct_link); | |
b9dacc52 ML |
523 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
524 | } | |
525 | } | |
526 | ||
fe8bc396 SE |
527 | static void batadv_iv_ogm_forward(struct orig_node *orig_node, |
528 | const struct ethhdr *ethhdr, | |
529 | struct batman_ogm_packet *batman_ogm_packet, | |
530 | bool is_single_hop_neigh, | |
531 | bool is_from_best_next_hop, | |
532 | struct hard_iface *if_incoming) | |
b9dacc52 ML |
533 | { |
534 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
b9dacc52 ML |
535 | uint8_t tt_num_changes; |
536 | ||
76543d14 | 537 | if (batman_ogm_packet->header.ttl <= 1) { |
1eda58bf | 538 | batadv_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
539 | return; |
540 | } | |
541 | ||
13b2541b ML |
542 | if (!is_from_best_next_hop) { |
543 | /* Mark the forwarded packet when it is not coming from our | |
544 | * best next hop. We still need to forward the packet for our | |
545 | * neighbor link quality detection to work in case the packet | |
546 | * originated from a single hop neighbor. Otherwise we can | |
547 | * simply drop the ogm. | |
548 | */ | |
549 | if (is_single_hop_neigh) | |
550 | batman_ogm_packet->flags |= NOT_BEST_NEXT_HOP; | |
551 | else | |
552 | return; | |
553 | } | |
b9dacc52 | 554 | |
b9dacc52 ML |
555 | tt_num_changes = batman_ogm_packet->tt_num_changes; |
556 | ||
76543d14 | 557 | batman_ogm_packet->header.ttl--; |
b9dacc52 ML |
558 | memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
559 | ||
b9dacc52 | 560 | /* apply hop penalty */ |
fe8bc396 SE |
561 | batman_ogm_packet->tq = batadv_hop_penalty(batman_ogm_packet->tq, |
562 | bat_priv); | |
b9dacc52 | 563 | |
1eda58bf SE |
564 | batadv_dbg(DBG_BATMAN, bat_priv, |
565 | "Forwarding packet: tq: %i, ttl: %i\n", | |
566 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl); | |
b9dacc52 | 567 | |
b9dacc52 ML |
568 | /* switch of primaries first hop flag when forwarding */ |
569 | batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP; | |
75cd33f8 | 570 | if (is_single_hop_neigh) |
b9dacc52 ML |
571 | batman_ogm_packet->flags |= DIRECTLINK; |
572 | else | |
573 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
574 | ||
fe8bc396 | 575 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet, |
7e071c79 | 576 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 577 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
578 | } |
579 | ||
fe8bc396 | 580 | static void batadv_iv_ogm_schedule(struct hard_iface *hard_iface) |
b9dacc52 ML |
581 | { |
582 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
583 | struct batman_ogm_packet *batman_ogm_packet; | |
584 | struct hard_iface *primary_if; | |
be9aa4c1 | 585 | int vis_server, tt_num_changes = 0; |
b9dacc52 ML |
586 | |
587 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 588 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 589 | |
be9aa4c1 ML |
590 | if (hard_iface == primary_if) |
591 | tt_num_changes = batadv_tt_append_diff(bat_priv, | |
592 | &hard_iface->packet_buff, | |
593 | &hard_iface->packet_len, | |
7e071c79 | 594 | BATADV_OGM_HLEN); |
be9aa4c1 | 595 | |
b9dacc52 ML |
596 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; |
597 | ||
598 | /* change sequence number to network order */ | |
599 | batman_ogm_packet->seqno = | |
600 | htonl((uint32_t)atomic_read(&hard_iface->seqno)); | |
be9aa4c1 | 601 | atomic_inc(&hard_iface->seqno); |
b9dacc52 ML |
602 | |
603 | batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn); | |
66a1b2bc | 604 | batman_ogm_packet->tt_crc = htons(bat_priv->tt_crc); |
b9dacc52 ML |
605 | if (tt_num_changes >= 0) |
606 | batman_ogm_packet->tt_num_changes = tt_num_changes; | |
607 | ||
608 | if (vis_server == VIS_TYPE_SERVER_SYNC) | |
609 | batman_ogm_packet->flags |= VIS_SERVER; | |
610 | else | |
611 | batman_ogm_packet->flags &= ~VIS_SERVER; | |
612 | ||
613 | if ((hard_iface == primary_if) && | |
cd646ab1 | 614 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER)) |
b9dacc52 ML |
615 | batman_ogm_packet->gw_flags = |
616 | (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
617 | else | |
42d0b044 | 618 | batman_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
b9dacc52 | 619 | |
30d3c511 | 620 | batadv_slide_own_bcast_window(hard_iface); |
fe8bc396 SE |
621 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff, |
622 | hard_iface->packet_len, hard_iface, 1, | |
623 | batadv_iv_ogm_emit_send_time(bat_priv)); | |
b9dacc52 ML |
624 | |
625 | if (primary_if) | |
e5d89254 | 626 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
627 | } |
628 | ||
fe8bc396 SE |
629 | static void |
630 | batadv_iv_ogm_orig_update(struct bat_priv *bat_priv, | |
631 | struct orig_node *orig_node, | |
632 | const struct ethhdr *ethhdr, | |
633 | const struct batman_ogm_packet *batman_ogm_packet, | |
634 | struct hard_iface *if_incoming, | |
635 | const unsigned char *tt_buff, | |
636 | int is_duplicate) | |
fc957275 ML |
637 | { |
638 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
639 | struct neigh_node *router = NULL; | |
640 | struct orig_node *orig_node_tmp; | |
641 | struct hlist_node *node; | |
642 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; | |
1eda58bf | 643 | uint8_t *neigh_addr; |
fc957275 | 644 | |
1eda58bf SE |
645 | batadv_dbg(DBG_BATMAN, bat_priv, |
646 | "update_originator(): Searching and updating originator entry of received packet\n"); | |
fc957275 ML |
647 | |
648 | rcu_read_lock(); | |
649 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
650 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
651 | neigh_addr = tmp_neigh_node->addr; |
652 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
653 | tmp_neigh_node->if_incoming == if_incoming && | |
654 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 655 | if (neigh_node) |
7d211efc | 656 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
657 | neigh_node = tmp_neigh_node; |
658 | continue; | |
659 | } | |
660 | ||
661 | if (is_duplicate) | |
662 | continue; | |
663 | ||
e3b0d0de | 664 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
665 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
666 | &tmp_neigh_node->tq_index, 0); | |
fc957275 | 667 | tmp_neigh_node->tq_avg = |
925a6672 | 668 | batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
e3b0d0de | 669 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
670 | } |
671 | ||
672 | if (!neigh_node) { | |
673 | struct orig_node *orig_tmp; | |
674 | ||
7d211efc | 675 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
676 | if (!orig_tmp) |
677 | goto unlock; | |
678 | ||
fe8bc396 SE |
679 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
680 | ethhdr->h_source, | |
681 | orig_node, orig_tmp, | |
682 | batman_ogm_packet->seqno); | |
fc957275 | 683 | |
7d211efc | 684 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
685 | if (!neigh_node) |
686 | goto unlock; | |
687 | } else | |
1eda58bf SE |
688 | batadv_dbg(DBG_BATMAN, bat_priv, |
689 | "Updating existing last-hop neighbor of originator\n"); | |
fc957275 ML |
690 | |
691 | rcu_read_unlock(); | |
692 | ||
693 | orig_node->flags = batman_ogm_packet->flags; | |
d7b2a97e | 694 | neigh_node->last_seen = jiffies; |
fc957275 | 695 | |
e3b0d0de | 696 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
697 | batadv_ring_buffer_set(neigh_node->tq_recv, |
698 | &neigh_node->tq_index, | |
699 | batman_ogm_packet->tq); | |
700 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); | |
e3b0d0de | 701 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
702 | |
703 | if (!is_duplicate) { | |
76543d14 SE |
704 | orig_node->last_ttl = batman_ogm_packet->header.ttl; |
705 | neigh_node->last_ttl = batman_ogm_packet->header.ttl; | |
fc957275 ML |
706 | } |
707 | ||
30d3c511 | 708 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
709 | |
710 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
711 | * to change |
712 | */ | |
7d211efc | 713 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
714 | if (router == neigh_node) |
715 | goto update_tt; | |
716 | ||
717 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
718 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
719 | goto update_tt; | |
720 | ||
721 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
722 | * won't consider it either |
723 | */ | |
fc957275 ML |
724 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
725 | orig_node_tmp = router->orig_node; | |
726 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
727 | bcast_own_sum_orig = | |
728 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
729 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
730 | ||
731 | orig_node_tmp = neigh_node->orig_node; | |
732 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
733 | bcast_own_sum_neigh = | |
734 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
735 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
736 | ||
737 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
738 | goto update_tt; | |
739 | } | |
740 | ||
30d3c511 | 741 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
742 | |
743 | update_tt: | |
744 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
745 | * sent through a primary interface |
746 | */ | |
fc957275 | 747 | if (((batman_ogm_packet->orig != ethhdr->h_source) && |
76543d14 | 748 | (batman_ogm_packet->header.ttl > 2)) || |
fc957275 | 749 | (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
08c36d3e SE |
750 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
751 | batman_ogm_packet->tt_num_changes, | |
752 | batman_ogm_packet->ttvn, | |
753 | ntohs(batman_ogm_packet->tt_crc)); | |
fc957275 ML |
754 | |
755 | if (orig_node->gw_flags != batman_ogm_packet->gw_flags) | |
7cf06bc6 SE |
756 | batadv_gw_node_update(bat_priv, orig_node, |
757 | batman_ogm_packet->gw_flags); | |
fc957275 ML |
758 | |
759 | orig_node->gw_flags = batman_ogm_packet->gw_flags; | |
760 | ||
761 | /* restart gateway selection if fast or late switching was enabled */ | |
762 | if ((orig_node->gw_flags) && | |
cd646ab1 | 763 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 764 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 765 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
766 | |
767 | goto out; | |
768 | ||
769 | unlock: | |
770 | rcu_read_unlock(); | |
771 | out: | |
772 | if (neigh_node) | |
7d211efc | 773 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 774 | if (router) |
7d211efc | 775 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
776 | } |
777 | ||
fe8bc396 SE |
778 | static int batadv_iv_ogm_calc_tq(struct orig_node *orig_node, |
779 | struct orig_node *orig_neigh_node, | |
780 | struct batman_ogm_packet *batman_ogm_packet, | |
781 | struct hard_iface *if_incoming) | |
fc957275 ML |
782 | { |
783 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
784 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
785 | struct hlist_node *node; | |
786 | uint8_t total_count; | |
42d0b044 SE |
787 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
788 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
789 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
790 | unsigned int combined_tq; | |
fc957275 ML |
791 | |
792 | /* find corresponding one hop neighbor */ | |
793 | rcu_read_lock(); | |
794 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
795 | &orig_neigh_node->neigh_list, list) { | |
796 | ||
1eda58bf SE |
797 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
798 | orig_neigh_node->orig)) | |
fc957275 ML |
799 | continue; |
800 | ||
801 | if (tmp_neigh_node->if_incoming != if_incoming) | |
802 | continue; | |
803 | ||
804 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
805 | continue; | |
806 | ||
807 | neigh_node = tmp_neigh_node; | |
808 | break; | |
809 | } | |
810 | rcu_read_unlock(); | |
811 | ||
812 | if (!neigh_node) | |
fe8bc396 SE |
813 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
814 | orig_neigh_node->orig, | |
815 | orig_neigh_node, | |
816 | orig_neigh_node, | |
817 | batman_ogm_packet->seqno); | |
fc957275 ML |
818 | |
819 | if (!neigh_node) | |
820 | goto out; | |
821 | ||
d7b2a97e | 822 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 823 | if (orig_node == orig_neigh_node) |
d7b2a97e | 824 | neigh_node->last_seen = jiffies; |
fc957275 | 825 | |
d7b2a97e | 826 | orig_node->last_seen = jiffies; |
fc957275 ML |
827 | |
828 | /* find packet count of corresponding one hop neighbor */ | |
829 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
830 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
831 | neigh_rq_count = neigh_node->real_packet_count; | |
832 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
833 | ||
834 | /* pay attention to not get a value bigger than 100 % */ | |
835 | total_count = (orig_eq_count > neigh_rq_count ? | |
836 | neigh_rq_count : orig_eq_count); | |
837 | ||
9cfc7bd6 SE |
838 | /* if we have too few packets (too less data) we set tq_own to zero |
839 | * if we receive too few packets it is not considered bidirectional | |
840 | */ | |
42d0b044 SE |
841 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
842 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
843 | tq_own = 0; |
844 | else | |
845 | /* neigh_node->real_packet_count is never zero as we | |
846 | * only purge old information when getting new | |
9cfc7bd6 SE |
847 | * information |
848 | */ | |
42d0b044 | 849 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 850 | |
21a1236b | 851 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
852 | * affect the nearly-symmetric links only a little, but |
853 | * punishes asymmetric links more. This will give a value | |
854 | * between 0 and TQ_MAX_VALUE | |
855 | */ | |
42d0b044 SE |
856 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
857 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
858 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
859 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
860 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
861 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
862 | inv_asym_penalty /= neigh_rq_max_cube; | |
863 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
864 | ||
865 | combined_tq = batman_ogm_packet->tq * tq_own * tq_asym_penalty; | |
866 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; | |
867 | batman_ogm_packet->tq = combined_tq; | |
fc957275 | 868 | |
1eda58bf SE |
869 | batadv_dbg(DBG_BATMAN, bat_priv, |
870 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", | |
871 | orig_node->orig, orig_neigh_node->orig, total_count, | |
872 | neigh_rq_count, tq_own, | |
873 | tq_asym_penalty, batman_ogm_packet->tq); | |
fc957275 ML |
874 | |
875 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
876 | * consider it bidirectional |
877 | */ | |
42d0b044 | 878 | if (batman_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
879 | ret = 1; |
880 | ||
881 | out: | |
882 | if (neigh_node) | |
7d211efc | 883 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
884 | return ret; |
885 | } | |
886 | ||
887 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
888 | * finds out whether it is a duplicate. | |
889 | * returns: | |
890 | * 1 the packet is a duplicate | |
891 | * 0 the packet has not yet been received | |
892 | * -1 the packet is old and has been received while the seqno window | |
893 | * was protected. Caller should drop it. | |
894 | */ | |
fe8bc396 SE |
895 | static int |
896 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
897 | const struct batman_ogm_packet *batman_ogm_packet, | |
898 | const struct hard_iface *if_incoming) | |
fc957275 ML |
899 | { |
900 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
901 | struct orig_node *orig_node; | |
902 | struct neigh_node *tmp_neigh_node; | |
903 | struct hlist_node *node; | |
904 | int is_duplicate = 0; | |
905 | int32_t seq_diff; | |
906 | int need_update = 0; | |
907 | int set_mark, ret = -1; | |
e0f5211f | 908 | uint32_t seqno = ntohl(batman_ogm_packet->seqno); |
1eda58bf | 909 | uint8_t *neigh_addr; |
fc957275 | 910 | |
7d211efc | 911 | orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig); |
fc957275 ML |
912 | if (!orig_node) |
913 | return 0; | |
914 | ||
915 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 916 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
917 | |
918 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 919 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
920 | batadv_window_protected(bat_priv, seq_diff, |
921 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
922 | goto out; |
923 | ||
924 | rcu_read_lock(); | |
925 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
926 | &orig_node->neigh_list, list) { | |
927 | ||
9b4a1159 SE |
928 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
929 | orig_node->last_real_seqno, | |
930 | seqno); | |
fc957275 | 931 | |
1eda58bf SE |
932 | neigh_addr = tmp_neigh_node->addr; |
933 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
934 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
935 | set_mark = 1; |
936 | else | |
937 | set_mark = 0; | |
938 | ||
939 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
940 | need_update |= batadv_bit_get_packet(bat_priv, |
941 | tmp_neigh_node->real_bits, | |
942 | seq_diff, set_mark); | |
fc957275 ML |
943 | |
944 | tmp_neigh_node->real_packet_count = | |
0079d2ce | 945 | bitmap_weight(tmp_neigh_node->real_bits, |
42d0b044 | 946 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
fc957275 ML |
947 | } |
948 | rcu_read_unlock(); | |
949 | ||
950 | if (need_update) { | |
1eda58bf SE |
951 | batadv_dbg(DBG_BATMAN, bat_priv, |
952 | "updating last_seqno: old %u, new %u\n", | |
953 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 954 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
955 | } |
956 | ||
957 | ret = is_duplicate; | |
958 | ||
959 | out: | |
960 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 961 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
962 | return ret; |
963 | } | |
964 | ||
fe8bc396 SE |
965 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
966 | struct batman_ogm_packet *batman_ogm_packet, | |
967 | const unsigned char *tt_buff, | |
968 | struct hard_iface *if_incoming) | |
fc957275 ML |
969 | { |
970 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
971 | struct hard_iface *hard_iface; | |
972 | struct orig_node *orig_neigh_node, *orig_node; | |
973 | struct neigh_node *router = NULL, *router_router = NULL; | |
974 | struct neigh_node *orig_neigh_router = NULL; | |
975 | int has_directlink_flag; | |
976 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
fe8bc396 | 977 | int is_broadcast = 0, is_bidirect; |
75cd33f8 | 978 | bool is_single_hop_neigh = false; |
13b2541b | 979 | bool is_from_best_next_hop = false; |
fe8bc396 | 980 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 981 | uint32_t if_incoming_seqno; |
1eda58bf | 982 | uint8_t *prev_sender; |
fc957275 ML |
983 | |
984 | /* Silently drop when the batman packet is actually not a | |
985 | * correct packet. | |
986 | * | |
987 | * This might happen if a packet is padded (e.g. Ethernet has a | |
988 | * minimum frame length of 64 byte) and the aggregation interprets | |
989 | * it as an additional length. | |
990 | * | |
991 | * TODO: A more sane solution would be to have a bit in the | |
992 | * batman_ogm_packet to detect whether the packet is the last | |
993 | * packet in an aggregation. Here we expect that the padding | |
994 | * is always zero (or not 0x01) | |
995 | */ | |
1eeb479f | 996 | if (batman_ogm_packet->header.packet_type != BAT_IV_OGM) |
fc957275 ML |
997 | return; |
998 | ||
999 | /* could be changed by schedule_own_packet() */ | |
1000 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
1001 | ||
1002 | has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
1003 | ||
1eda58bf | 1004 | if (batadv_compare_eth(ethhdr->h_source, batman_ogm_packet->orig)) |
75cd33f8 | 1005 | is_single_hop_neigh = true; |
fc957275 | 1006 | |
1eda58bf SE |
1007 | batadv_dbg(DBG_BATMAN, bat_priv, |
1008 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n", | |
1009 | ethhdr->h_source, if_incoming->net_dev->name, | |
1010 | if_incoming->net_dev->dev_addr, batman_ogm_packet->orig, | |
1011 | batman_ogm_packet->prev_sender, | |
1012 | ntohl(batman_ogm_packet->seqno), batman_ogm_packet->ttvn, | |
1013 | ntohs(batman_ogm_packet->tt_crc), | |
1014 | batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq, | |
1015 | batman_ogm_packet->header.ttl, | |
1016 | batman_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1017 | |
1018 | rcu_read_lock(); | |
3193e8fd | 1019 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1020 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1021 | continue; |
1022 | ||
1023 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1024 | continue; | |
1025 | ||
1eda58bf SE |
1026 | if (batadv_compare_eth(ethhdr->h_source, |
1027 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1028 | is_my_addr = 1; |
1029 | ||
1eda58bf SE |
1030 | if (batadv_compare_eth(batman_ogm_packet->orig, |
1031 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1032 | is_my_orig = 1; |
1033 | ||
1eda58bf SE |
1034 | if (batadv_compare_eth(batman_ogm_packet->prev_sender, |
1035 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1036 | is_my_oldorig = 1; |
1037 | ||
1038 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1039 | is_broadcast = 1; | |
1040 | } | |
1041 | rcu_read_unlock(); | |
1042 | ||
7e071c79 | 1043 | if (batman_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
1eda58bf SE |
1044 | batadv_dbg(DBG_BATMAN, bat_priv, |
1045 | "Drop packet: incompatible batman version (%i)\n", | |
1046 | batman_ogm_packet->header.version); | |
fc957275 ML |
1047 | return; |
1048 | } | |
1049 | ||
1050 | if (is_my_addr) { | |
1eda58bf SE |
1051 | batadv_dbg(DBG_BATMAN, bat_priv, |
1052 | "Drop packet: received my own broadcast (sender: %pM)\n", | |
1053 | ethhdr->h_source); | |
fc957275 ML |
1054 | return; |
1055 | } | |
1056 | ||
1057 | if (is_broadcast) { | |
1eda58bf SE |
1058 | batadv_dbg(DBG_BATMAN, bat_priv, |
1059 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", | |
1060 | ethhdr->h_source); | |
fc957275 ML |
1061 | return; |
1062 | } | |
1063 | ||
1064 | if (is_my_orig) { | |
1065 | unsigned long *word; | |
1066 | int offset; | |
9b4a1159 | 1067 | int32_t bit_pos; |
42d0b044 SE |
1068 | int16_t if_num; |
1069 | uint8_t *weight; | |
fc957275 | 1070 | |
7d211efc SE |
1071 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1072 | ethhdr->h_source); | |
fc957275 ML |
1073 | if (!orig_neigh_node) |
1074 | return; | |
1075 | ||
1076 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1077 | * come via the corresponding interface |
1078 | * save packet seqno for bidirectional check | |
1079 | */ | |
fc957275 | 1080 | if (has_directlink_flag && |
1eda58bf SE |
1081 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
1082 | batman_ogm_packet->orig)) { | |
42d0b044 SE |
1083 | if_num = if_incoming->if_num; |
1084 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1085 | |
1086 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1087 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 SE |
1088 | bit_pos = if_incoming_seqno - 2; |
1089 | bit_pos -= ntohl(batman_ogm_packet->seqno); | |
1090 | batadv_set_bit(word, bit_pos); | |
42d0b044 SE |
1091 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1092 | *weight = bitmap_weight(word, | |
1093 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1094 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1095 | } | |
1096 | ||
1eda58bf SE |
1097 | batadv_dbg(DBG_BATMAN, bat_priv, |
1098 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
7d211efc | 1099 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1100 | return; |
1101 | } | |
1102 | ||
1103 | if (is_my_oldorig) { | |
1eda58bf SE |
1104 | batadv_dbg(DBG_BATMAN, bat_priv, |
1105 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", | |
1106 | ethhdr->h_source); | |
fc957275 ML |
1107 | return; |
1108 | } | |
1109 | ||
13b2541b | 1110 | if (batman_ogm_packet->flags & NOT_BEST_NEXT_HOP) { |
1eda58bf SE |
1111 | batadv_dbg(DBG_BATMAN, bat_priv, |
1112 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", | |
1113 | ethhdr->h_source); | |
13b2541b ML |
1114 | return; |
1115 | } | |
1116 | ||
7d211efc | 1117 | orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig); |
fc957275 ML |
1118 | if (!orig_node) |
1119 | return; | |
1120 | ||
fe8bc396 SE |
1121 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet, |
1122 | if_incoming); | |
fc957275 ML |
1123 | |
1124 | if (is_duplicate == -1) { | |
1eda58bf SE |
1125 | batadv_dbg(DBG_BATMAN, bat_priv, |
1126 | "Drop packet: packet within seqno protection time (sender: %pM)\n", | |
1127 | ethhdr->h_source); | |
fc957275 ML |
1128 | goto out; |
1129 | } | |
1130 | ||
1131 | if (batman_ogm_packet->tq == 0) { | |
1eda58bf SE |
1132 | batadv_dbg(DBG_BATMAN, bat_priv, |
1133 | "Drop packet: originator packet with tq equal 0\n"); | |
fc957275 ML |
1134 | goto out; |
1135 | } | |
1136 | ||
7d211efc | 1137 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1138 | if (router) |
7d211efc | 1139 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1140 | |
13b2541b | 1141 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1142 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1143 | is_from_best_next_hop = true; |
1144 | ||
1eda58bf | 1145 | prev_sender = batman_ogm_packet->prev_sender; |
fc957275 ML |
1146 | /* avoid temporary routing loops */ |
1147 | if (router && router_router && | |
1eda58bf SE |
1148 | (batadv_compare_eth(router->addr, prev_sender)) && |
1149 | !(batadv_compare_eth(batman_ogm_packet->orig, prev_sender)) && | |
1150 | (batadv_compare_eth(router->addr, router_router->addr))) { | |
1151 | batadv_dbg(DBG_BATMAN, bat_priv, | |
1152 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", | |
1153 | ethhdr->h_source); | |
fc957275 ML |
1154 | goto out; |
1155 | } | |
1156 | ||
1157 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1158 | * originator mac |
1159 | */ | |
fc957275 ML |
1160 | orig_neigh_node = (is_single_hop_neigh ? |
1161 | orig_node : | |
7d211efc | 1162 | batadv_get_orig_node(bat_priv, ethhdr->h_source)); |
fc957275 ML |
1163 | if (!orig_neigh_node) |
1164 | goto out; | |
1165 | ||
7d211efc | 1166 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1167 | |
1168 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1169 | * don't route towards it |
1170 | */ | |
fc957275 | 1171 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
1eda58bf SE |
1172 | batadv_dbg(DBG_BATMAN, bat_priv, |
1173 | "Drop packet: OGM via unknown neighbor!\n"); | |
fc957275 ML |
1174 | goto out_neigh; |
1175 | } | |
1176 | ||
fe8bc396 SE |
1177 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
1178 | batman_ogm_packet, if_incoming); | |
fc957275 | 1179 | |
30d3c511 SE |
1180 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
1181 | batman_ogm_packet); | |
fc957275 ML |
1182 | |
1183 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1184 | * seqno and similar ttl as the non-duplicate |
1185 | */ | |
fe8bc396 SE |
1186 | sameseq = orig_node->last_real_seqno == ntohl(batman_ogm_packet->seqno); |
1187 | simlar_ttl = orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl; | |
1188 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) | |
1189 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
1190 | batman_ogm_packet, if_incoming, | |
1191 | tt_buff, is_duplicate); | |
fc957275 ML |
1192 | |
1193 | /* is single hop (direct) neighbor */ | |
1194 | if (is_single_hop_neigh) { | |
1195 | ||
1196 | /* mark direct link on incoming interface */ | |
fe8bc396 SE |
1197 | batadv_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
1198 | is_single_hop_neigh, | |
1199 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1200 | |
1eda58bf SE |
1201 | batadv_dbg(DBG_BATMAN, bat_priv, |
1202 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); | |
fc957275 ML |
1203 | goto out_neigh; |
1204 | } | |
1205 | ||
1206 | /* multihop originator */ | |
fe8bc396 | 1207 | if (!is_bidirect) { |
1eda58bf SE |
1208 | batadv_dbg(DBG_BATMAN, bat_priv, |
1209 | "Drop packet: not received via bidirectional link\n"); | |
fc957275 ML |
1210 | goto out_neigh; |
1211 | } | |
1212 | ||
1213 | if (is_duplicate) { | |
1eda58bf SE |
1214 | batadv_dbg(DBG_BATMAN, bat_priv, |
1215 | "Drop packet: duplicate packet received\n"); | |
fc957275 ML |
1216 | goto out_neigh; |
1217 | } | |
1218 | ||
1eda58bf SE |
1219 | batadv_dbg(DBG_BATMAN, bat_priv, |
1220 | "Forwarding packet: rebroadcast originator packet\n"); | |
fe8bc396 SE |
1221 | batadv_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
1222 | is_single_hop_neigh, is_from_best_next_hop, | |
1223 | if_incoming); | |
fc957275 ML |
1224 | |
1225 | out_neigh: | |
1226 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1227 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1228 | out: |
1229 | if (router) | |
7d211efc | 1230 | batadv_neigh_node_free_ref(router); |
fc957275 | 1231 | if (router_router) |
7d211efc | 1232 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1233 | if (orig_neigh_router) |
7d211efc | 1234 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1235 | |
7d211efc | 1236 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1237 | } |
1238 | ||
fe8bc396 SE |
1239 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
1240 | struct hard_iface *if_incoming) | |
fc957275 | 1241 | { |
edbf12ba | 1242 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
fc957275 | 1243 | struct batman_ogm_packet *batman_ogm_packet; |
8780dad9 ML |
1244 | struct ethhdr *ethhdr; |
1245 | int buff_pos = 0, packet_len; | |
1246 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 ML |
1247 | bool ret; |
1248 | ||
7e071c79 | 1249 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1250 | if (!ret) |
1251 | return NET_RX_DROP; | |
fc957275 | 1252 | |
edbf12ba ML |
1253 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1254 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1255 | */ | |
fe8bc396 | 1256 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1257 | return NET_RX_DROP; |
1258 | ||
d69909d2 SE |
1259 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1260 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1261 | skb->len + ETH_HLEN); |
1262 | ||
8780dad9 ML |
1263 | packet_len = skb_headlen(skb); |
1264 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1265 | packet_buff = skb->data; | |
fc957275 ML |
1266 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; |
1267 | ||
1268 | /* unpack the aggregated packets and process them one by one */ | |
1269 | do { | |
7e071c79 | 1270 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1271 | |
fe8bc396 SE |
1272 | batadv_iv_ogm_process(ethhdr, batman_ogm_packet, tt_buff, |
1273 | if_incoming); | |
fc957275 | 1274 | |
7e071c79 | 1275 | buff_pos += BATADV_OGM_HLEN; |
08c36d3e | 1276 | buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes); |
fc957275 ML |
1277 | |
1278 | batman_ogm_packet = (struct batman_ogm_packet *) | |
1279 | (packet_buff + buff_pos); | |
fe8bc396 SE |
1280 | } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
1281 | batman_ogm_packet->tt_num_changes)); | |
c3e29312 ML |
1282 | |
1283 | kfree_skb(skb); | |
1284 | return NET_RX_SUCCESS; | |
fc957275 | 1285 | } |
1c280471 | 1286 | |
fe8bc396 | 1287 | static struct bat_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1288 | .name = "BATMAN_IV", |
fe8bc396 SE |
1289 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1290 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1291 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1292 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1293 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1294 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1295 | }; |
1296 | ||
81c524f7 | 1297 | int __init batadv_iv_init(void) |
1c280471 | 1298 | { |
c3e29312 ML |
1299 | int ret; |
1300 | ||
1301 | /* batman originator packet */ | |
fe8bc396 | 1302 | ret = batadv_recv_handler_register(BAT_IV_OGM, batadv_iv_ogm_receive); |
c3e29312 ML |
1303 | if (ret < 0) |
1304 | goto out; | |
1305 | ||
fe8bc396 | 1306 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1307 | if (ret < 0) |
1308 | goto handler_unregister; | |
1309 | ||
1310 | goto out; | |
1311 | ||
1312 | handler_unregister: | |
3193e8fd | 1313 | batadv_recv_handler_unregister(BAT_IV_OGM); |
c3e29312 ML |
1314 | out: |
1315 | return ret; | |
1c280471 | 1316 | } |