Commit | Line | Data |
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fc957275 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
fc957275 ML |
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" | |
fc957275 ML |
23 | #include "translation-table.h" |
24 | #include "ring_buffer.h" | |
25 | #include "originator.h" | |
26 | #include "routing.h" | |
27 | #include "gateway_common.h" | |
28 | #include "gateway_client.h" | |
29 | #include "hard-interface.h" | |
30 | #include "send.h" | |
1c280471 | 31 | #include "bat_algo.h" |
fc957275 | 32 | |
7ae8b285 ML |
33 | static struct neigh_node *bat_iv_ogm_neigh_new(struct hard_iface *hard_iface, |
34 | const uint8_t *neigh_addr, | |
35 | struct orig_node *orig_node, | |
36 | struct orig_node *orig_neigh, | |
e0f5211f | 37 | __be32 seqno) |
7ae8b285 ML |
38 | { |
39 | struct neigh_node *neigh_node; | |
40 | ||
e0f5211f AV |
41 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, |
42 | ntohl(seqno)); | |
7ae8b285 ML |
43 | if (!neigh_node) |
44 | goto out; | |
45 | ||
46 | INIT_LIST_HEAD(&neigh_node->bonding_list); | |
7ae8b285 ML |
47 | |
48 | neigh_node->orig_node = orig_neigh; | |
49 | neigh_node->if_incoming = hard_iface; | |
50 | ||
51 | spin_lock_bh(&orig_node->neigh_list_lock); | |
52 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
53 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
54 | ||
55 | out: | |
56 | return neigh_node; | |
57 | } | |
58 | ||
77af7575 | 59 | static int bat_iv_ogm_iface_enable(struct hard_iface *hard_iface) |
d0b9fd89 ML |
60 | { |
61 | struct batman_ogm_packet *batman_ogm_packet; | |
d7d32ec0 | 62 | uint32_t random_seqno; |
77af7575 | 63 | int res = -1; |
d7d32ec0 ML |
64 | |
65 | /* randomize initial seqno to avoid collision */ | |
66 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
67 | atomic_set(&hard_iface->seqno, random_seqno); | |
d0b9fd89 | 68 | |
76e3d7fc | 69 | hard_iface->packet_len = BATMAN_OGM_HLEN; |
d0b9fd89 ML |
70 | hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC); |
71 | ||
77af7575 ML |
72 | if (!hard_iface->packet_buff) |
73 | goto out; | |
74 | ||
d0b9fd89 | 75 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; |
1eeb479f | 76 | batman_ogm_packet->header.packet_type = BAT_IV_OGM; |
76543d14 SE |
77 | batman_ogm_packet->header.version = COMPAT_VERSION; |
78 | batman_ogm_packet->header.ttl = 2; | |
d0b9fd89 | 79 | batman_ogm_packet->flags = NO_FLAGS; |
d0b9fd89 ML |
80 | batman_ogm_packet->tq = TQ_MAX_VALUE; |
81 | batman_ogm_packet->tt_num_changes = 0; | |
82 | batman_ogm_packet->ttvn = 0; | |
77af7575 ML |
83 | |
84 | res = 0; | |
85 | ||
86 | out: | |
87 | return res; | |
d0b9fd89 ML |
88 | } |
89 | ||
00a50076 ML |
90 | static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface) |
91 | { | |
92 | kfree(hard_iface->packet_buff); | |
93 | hard_iface->packet_buff = NULL; | |
94 | } | |
95 | ||
c3229398 | 96 | static void bat_iv_ogm_iface_update_mac(struct hard_iface *hard_iface) |
d0b9fd89 ML |
97 | { |
98 | struct batman_ogm_packet *batman_ogm_packet; | |
99 | ||
100 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; | |
c3229398 ML |
101 | memcpy(batman_ogm_packet->orig, |
102 | hard_iface->net_dev->dev_addr, ETH_ALEN); | |
103 | memcpy(batman_ogm_packet->prev_sender, | |
104 | hard_iface->net_dev->dev_addr, ETH_ALEN); | |
d0b9fd89 ML |
105 | } |
106 | ||
c3229398 | 107 | static void bat_iv_ogm_primary_iface_set(struct hard_iface *hard_iface) |
d0b9fd89 ML |
108 | { |
109 | struct batman_ogm_packet *batman_ogm_packet; | |
110 | ||
111 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; | |
c3229398 ML |
112 | batman_ogm_packet->flags = PRIMARIES_FIRST_HOP; |
113 | batman_ogm_packet->header.ttl = TTL; | |
d0b9fd89 ML |
114 | } |
115 | ||
b9dacc52 | 116 | /* when do we schedule our own ogm to be sent */ |
01c4224b | 117 | static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv) |
b9dacc52 ML |
118 | { |
119 | return jiffies + msecs_to_jiffies( | |
120 | atomic_read(&bat_priv->orig_interval) - | |
121 | JITTER + (random32() % 2*JITTER)); | |
122 | } | |
123 | ||
124 | /* when do we schedule a ogm packet to be sent */ | |
01c4224b | 125 | static unsigned long bat_iv_ogm_fwd_send_time(void) |
b9dacc52 ML |
126 | { |
127 | return jiffies + msecs_to_jiffies(random32() % (JITTER/2)); | |
128 | } | |
129 | ||
130 | /* apply hop penalty for a normal link */ | |
131 | static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv) | |
132 | { | |
133 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
134 | return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE); | |
135 | } | |
136 | ||
fc957275 | 137 | /* is there another aggregated packet here? */ |
01c4224b ML |
138 | static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
139 | int tt_num_changes) | |
fc957275 | 140 | { |
76e3d7fc | 141 | int next_buff_pos = buff_pos + BATMAN_OGM_HLEN + tt_len(tt_num_changes); |
fc957275 ML |
142 | |
143 | return (next_buff_pos <= packet_len) && | |
144 | (next_buff_pos <= MAX_AGGREGATION_BYTES); | |
145 | } | |
146 | ||
b9dacc52 | 147 | /* send a batman ogm to a given interface */ |
01c4224b ML |
148 | static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet, |
149 | struct hard_iface *hard_iface) | |
b9dacc52 ML |
150 | { |
151 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
152 | char *fwd_str; | |
153 | uint8_t packet_num; | |
154 | int16_t buff_pos; | |
155 | struct batman_ogm_packet *batman_ogm_packet; | |
156 | struct sk_buff *skb; | |
157 | ||
158 | if (hard_iface->if_status != IF_ACTIVE) | |
159 | return; | |
160 | ||
161 | packet_num = 0; | |
162 | buff_pos = 0; | |
163 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
164 | ||
165 | /* adjust all flags and log packets */ | |
01c4224b ML |
166 | while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
167 | batman_ogm_packet->tt_num_changes)) { | |
b9dacc52 ML |
168 | |
169 | /* we might have aggregated direct link packets with an | |
170 | * ordinary base packet */ | |
171 | if ((forw_packet->direct_link_flags & (1 << packet_num)) && | |
172 | (forw_packet->if_incoming == hard_iface)) | |
173 | batman_ogm_packet->flags |= DIRECTLINK; | |
174 | else | |
175 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
176 | ||
177 | fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? | |
178 | "Sending own" : | |
179 | "Forwarding")); | |
180 | bat_dbg(DBG_BATMAN, bat_priv, | |
c97c72b4 | 181 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
b9dacc52 ML |
182 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
183 | batman_ogm_packet->orig, | |
184 | ntohl(batman_ogm_packet->seqno), | |
76543d14 | 185 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl, |
b9dacc52 ML |
186 | (batman_ogm_packet->flags & DIRECTLINK ? |
187 | "on" : "off"), | |
188 | batman_ogm_packet->ttvn, hard_iface->net_dev->name, | |
189 | hard_iface->net_dev->dev_addr); | |
190 | ||
76e3d7fc | 191 | buff_pos += BATMAN_OGM_HLEN + |
b9dacc52 ML |
192 | tt_len(batman_ogm_packet->tt_num_changes); |
193 | packet_num++; | |
194 | batman_ogm_packet = (struct batman_ogm_packet *) | |
195 | (forw_packet->skb->data + buff_pos); | |
196 | } | |
197 | ||
198 | /* create clone because function is called more than once */ | |
199 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 MH |
200 | if (skb) { |
201 | batadv_inc_counter(bat_priv, BAT_CNT_MGMT_TX); | |
202 | batadv_add_counter(bat_priv, BAT_CNT_MGMT_TX_BYTES, | |
203 | skb->len + ETH_HLEN); | |
b9dacc52 | 204 | send_skb_packet(skb, hard_iface, broadcast_addr); |
f8214865 | 205 | } |
b9dacc52 ML |
206 | } |
207 | ||
208 | /* send a batman ogm packet */ | |
01c4224b | 209 | static void bat_iv_ogm_emit(struct forw_packet *forw_packet) |
b9dacc52 ML |
210 | { |
211 | struct hard_iface *hard_iface; | |
212 | struct net_device *soft_iface; | |
213 | struct bat_priv *bat_priv; | |
214 | struct hard_iface *primary_if = NULL; | |
215 | struct batman_ogm_packet *batman_ogm_packet; | |
216 | unsigned char directlink; | |
217 | ||
218 | batman_ogm_packet = (struct batman_ogm_packet *) | |
219 | (forw_packet->skb->data); | |
220 | directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
221 | ||
222 | if (!forw_packet->if_incoming) { | |
86ceb360 | 223 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
224 | goto out; |
225 | } | |
226 | ||
227 | soft_iface = forw_packet->if_incoming->soft_iface; | |
228 | bat_priv = netdev_priv(soft_iface); | |
229 | ||
230 | if (forw_packet->if_incoming->if_status != IF_ACTIVE) | |
231 | goto out; | |
232 | ||
233 | primary_if = primary_if_get_selected(bat_priv); | |
234 | if (!primary_if) | |
235 | goto out; | |
236 | ||
237 | /* multihomed peer assumed */ | |
238 | /* non-primary OGMs are only broadcasted on their interface */ | |
76543d14 | 239 | if ((directlink && (batman_ogm_packet->header.ttl == 1)) || |
b9dacc52 ML |
240 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
241 | ||
242 | /* FIXME: what about aggregated packets ? */ | |
243 | bat_dbg(DBG_BATMAN, bat_priv, | |
c97c72b4 | 244 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
b9dacc52 ML |
245 | (forw_packet->own ? "Sending own" : "Forwarding"), |
246 | batman_ogm_packet->orig, | |
247 | ntohl(batman_ogm_packet->seqno), | |
76543d14 | 248 | batman_ogm_packet->header.ttl, |
b9dacc52 ML |
249 | forw_packet->if_incoming->net_dev->name, |
250 | forw_packet->if_incoming->net_dev->dev_addr); | |
251 | ||
252 | /* skb is only used once and than forw_packet is free'd */ | |
253 | send_skb_packet(forw_packet->skb, forw_packet->if_incoming, | |
254 | broadcast_addr); | |
255 | forw_packet->skb = NULL; | |
256 | ||
257 | goto out; | |
258 | } | |
259 | ||
260 | /* broadcast on every interface */ | |
261 | rcu_read_lock(); | |
262 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { | |
263 | if (hard_iface->soft_iface != soft_iface) | |
264 | continue; | |
265 | ||
01c4224b | 266 | bat_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
267 | } |
268 | rcu_read_unlock(); | |
269 | ||
270 | out: | |
271 | if (primary_if) | |
272 | hardif_free_ref(primary_if); | |
273 | } | |
274 | ||
275 | /* return true if new_packet can be aggregated with forw_packet */ | |
01c4224b | 276 | static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet |
b9dacc52 | 277 | *new_batman_ogm_packet, |
01c4224b ML |
278 | struct bat_priv *bat_priv, |
279 | int packet_len, unsigned long send_time, | |
280 | bool directlink, | |
281 | const struct hard_iface *if_incoming, | |
282 | const struct forw_packet *forw_packet) | |
b9dacc52 ML |
283 | { |
284 | struct batman_ogm_packet *batman_ogm_packet; | |
285 | int aggregated_bytes = forw_packet->packet_len + packet_len; | |
286 | struct hard_iface *primary_if = NULL; | |
287 | bool res = false; | |
288 | ||
289 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
290 | ||
291 | /** | |
292 | * we can aggregate the current packet to this aggregated packet | |
293 | * if: | |
294 | * | |
295 | * - the send time is within our MAX_AGGREGATION_MS time | |
296 | * - the resulting packet wont be bigger than | |
297 | * MAX_AGGREGATION_BYTES | |
298 | */ | |
299 | ||
300 | if (time_before(send_time, forw_packet->send_time) && | |
301 | time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS), | |
302 | forw_packet->send_time) && | |
303 | (aggregated_bytes <= MAX_AGGREGATION_BYTES)) { | |
304 | ||
305 | /** | |
306 | * check aggregation compatibility | |
307 | * -> direct link packets are broadcasted on | |
308 | * their interface only | |
309 | * -> aggregate packet if the current packet is | |
310 | * a "global" packet as well as the base | |
311 | * packet | |
312 | */ | |
313 | ||
314 | primary_if = primary_if_get_selected(bat_priv); | |
315 | if (!primary_if) | |
316 | goto out; | |
317 | ||
318 | /* packets without direct link flag and high TTL | |
319 | * are flooded through the net */ | |
320 | if ((!directlink) && | |
321 | (!(batman_ogm_packet->flags & DIRECTLINK)) && | |
76543d14 | 322 | (batman_ogm_packet->header.ttl != 1) && |
b9dacc52 ML |
323 | |
324 | /* own packets originating non-primary | |
325 | * interfaces leave only that interface */ | |
326 | ((!forw_packet->own) || | |
327 | (forw_packet->if_incoming == primary_if))) { | |
328 | res = true; | |
329 | goto out; | |
330 | } | |
331 | ||
332 | /* if the incoming packet is sent via this one | |
333 | * interface only - we still can aggregate */ | |
334 | if ((directlink) && | |
76543d14 | 335 | (new_batman_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
336 | (forw_packet->if_incoming == if_incoming) && |
337 | ||
338 | /* packets from direct neighbors or | |
339 | * own secondary interface packets | |
340 | * (= secondary interface packets in general) */ | |
341 | (batman_ogm_packet->flags & DIRECTLINK || | |
342 | (forw_packet->own && | |
343 | forw_packet->if_incoming != primary_if))) { | |
344 | res = true; | |
345 | goto out; | |
346 | } | |
347 | } | |
348 | ||
349 | out: | |
350 | if (primary_if) | |
351 | hardif_free_ref(primary_if); | |
352 | return res; | |
353 | } | |
354 | ||
355 | /* create a new aggregated packet and add this packet to it */ | |
01c4224b ML |
356 | static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
357 | int packet_len, unsigned long send_time, | |
358 | bool direct_link, | |
359 | struct hard_iface *if_incoming, | |
360 | int own_packet) | |
b9dacc52 ML |
361 | { |
362 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
363 | struct forw_packet *forw_packet_aggr; | |
364 | unsigned char *skb_buff; | |
365 | ||
366 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
367 | return; | |
368 | ||
369 | /* own packet should always be scheduled */ | |
370 | if (!own_packet) { | |
371 | if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) { | |
372 | bat_dbg(DBG_BATMAN, bat_priv, | |
373 | "batman packet queue full\n"); | |
374 | goto out; | |
375 | } | |
376 | } | |
377 | ||
378 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
379 | if (!forw_packet_aggr) { | |
380 | if (!own_packet) | |
381 | atomic_inc(&bat_priv->batman_queue_left); | |
382 | goto out; | |
383 | } | |
384 | ||
385 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
386 | (packet_len < MAX_AGGREGATION_BYTES)) | |
387 | forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES + | |
0d125074 | 388 | ETH_HLEN); |
b9dacc52 | 389 | else |
0d125074 | 390 | forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN); |
b9dacc52 ML |
391 | |
392 | if (!forw_packet_aggr->skb) { | |
393 | if (!own_packet) | |
394 | atomic_inc(&bat_priv->batman_queue_left); | |
395 | kfree(forw_packet_aggr); | |
396 | goto out; | |
397 | } | |
0d125074 | 398 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 ML |
399 | |
400 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
401 | ||
402 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
403 | forw_packet_aggr->packet_len = packet_len; | |
404 | memcpy(skb_buff, packet_buff, packet_len); | |
405 | ||
406 | forw_packet_aggr->own = own_packet; | |
407 | forw_packet_aggr->if_incoming = if_incoming; | |
408 | forw_packet_aggr->num_packets = 0; | |
409 | forw_packet_aggr->direct_link_flags = NO_FLAGS; | |
410 | forw_packet_aggr->send_time = send_time; | |
411 | ||
412 | /* save packet direct link flag status */ | |
413 | if (direct_link) | |
414 | forw_packet_aggr->direct_link_flags |= 1; | |
415 | ||
416 | /* add new packet to packet list */ | |
417 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
418 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
419 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
420 | ||
421 | /* start timer for this packet */ | |
422 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
423 | send_outstanding_bat_ogm_packet); | |
424 | queue_delayed_work(bat_event_workqueue, | |
425 | &forw_packet_aggr->delayed_work, | |
426 | send_time - jiffies); | |
427 | ||
428 | return; | |
429 | out: | |
430 | hardif_free_ref(if_incoming); | |
431 | } | |
432 | ||
433 | /* aggregate a new packet into the existing ogm packet */ | |
01c4224b ML |
434 | static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr, |
435 | const unsigned char *packet_buff, | |
436 | int packet_len, bool direct_link) | |
b9dacc52 ML |
437 | { |
438 | unsigned char *skb_buff; | |
439 | ||
440 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
441 | memcpy(skb_buff, packet_buff, packet_len); | |
442 | forw_packet_aggr->packet_len += packet_len; | |
443 | forw_packet_aggr->num_packets++; | |
444 | ||
445 | /* save packet direct link flag status */ | |
446 | if (direct_link) | |
447 | forw_packet_aggr->direct_link_flags |= | |
448 | (1 << forw_packet_aggr->num_packets); | |
449 | } | |
450 | ||
01c4224b ML |
451 | static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv, |
452 | unsigned char *packet_buff, | |
453 | int packet_len, struct hard_iface *if_incoming, | |
454 | int own_packet, unsigned long send_time) | |
b9dacc52 ML |
455 | { |
456 | /** | |
457 | * _aggr -> pointer to the packet we want to aggregate with | |
458 | * _pos -> pointer to the position in the queue | |
459 | */ | |
460 | struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL; | |
461 | struct hlist_node *tmp_node; | |
462 | struct batman_ogm_packet *batman_ogm_packet; | |
463 | bool direct_link; | |
464 | ||
465 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; | |
466 | direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0; | |
467 | ||
468 | /* find position for the packet in the forward queue */ | |
469 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
470 | /* own packets are not to be aggregated */ | |
471 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
472 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
473 | &bat_priv->forw_bat_list, list) { | |
01c4224b ML |
474 | if (bat_iv_ogm_can_aggregate(batman_ogm_packet, |
475 | bat_priv, packet_len, | |
476 | send_time, direct_link, | |
477 | if_incoming, | |
478 | forw_packet_pos)) { | |
b9dacc52 ML |
479 | forw_packet_aggr = forw_packet_pos; |
480 | break; | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
485 | /* nothing to aggregate with - either aggregation disabled or no | |
486 | * suitable aggregation packet found */ | |
487 | if (!forw_packet_aggr) { | |
488 | /* the following section can run without the lock */ | |
489 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
490 | ||
491 | /** | |
492 | * if we could not aggregate this packet with one of the others | |
493 | * we hold it back for a while, so that it might be aggregated | |
494 | * later on | |
495 | */ | |
496 | if ((!own_packet) && | |
497 | (atomic_read(&bat_priv->aggregated_ogms))) | |
498 | send_time += msecs_to_jiffies(MAX_AGGREGATION_MS); | |
499 | ||
01c4224b ML |
500 | bat_iv_ogm_aggregate_new(packet_buff, packet_len, |
501 | send_time, direct_link, | |
502 | if_incoming, own_packet); | |
b9dacc52 | 503 | } else { |
01c4224b ML |
504 | bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
505 | packet_len, direct_link); | |
b9dacc52 ML |
506 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
507 | } | |
508 | } | |
509 | ||
01c4224b ML |
510 | static void bat_iv_ogm_forward(struct orig_node *orig_node, |
511 | const struct ethhdr *ethhdr, | |
512 | struct batman_ogm_packet *batman_ogm_packet, | |
75cd33f8 | 513 | bool is_single_hop_neigh, |
13b2541b | 514 | bool is_from_best_next_hop, |
75cd33f8 | 515 | struct hard_iface *if_incoming) |
b9dacc52 ML |
516 | { |
517 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
b9dacc52 ML |
518 | uint8_t tt_num_changes; |
519 | ||
76543d14 | 520 | if (batman_ogm_packet->header.ttl <= 1) { |
b9dacc52 ML |
521 | bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
522 | return; | |
523 | } | |
524 | ||
13b2541b ML |
525 | if (!is_from_best_next_hop) { |
526 | /* Mark the forwarded packet when it is not coming from our | |
527 | * best next hop. We still need to forward the packet for our | |
528 | * neighbor link quality detection to work in case the packet | |
529 | * originated from a single hop neighbor. Otherwise we can | |
530 | * simply drop the ogm. | |
531 | */ | |
532 | if (is_single_hop_neigh) | |
533 | batman_ogm_packet->flags |= NOT_BEST_NEXT_HOP; | |
534 | else | |
535 | return; | |
536 | } | |
b9dacc52 | 537 | |
b9dacc52 ML |
538 | tt_num_changes = batman_ogm_packet->tt_num_changes; |
539 | ||
76543d14 | 540 | batman_ogm_packet->header.ttl--; |
b9dacc52 ML |
541 | memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
542 | ||
b9dacc52 ML |
543 | /* apply hop penalty */ |
544 | batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv); | |
545 | ||
546 | bat_dbg(DBG_BATMAN, bat_priv, | |
13b2541b ML |
547 | "Forwarding packet: tq: %i, ttl: %i\n", |
548 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl); | |
b9dacc52 | 549 | |
b9dacc52 ML |
550 | batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc); |
551 | ||
552 | /* switch of primaries first hop flag when forwarding */ | |
553 | batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP; | |
75cd33f8 | 554 | if (is_single_hop_neigh) |
b9dacc52 ML |
555 | batman_ogm_packet->flags |= DIRECTLINK; |
556 | else | |
557 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
558 | ||
01c4224b | 559 | bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet, |
76e3d7fc | 560 | BATMAN_OGM_HLEN + tt_len(tt_num_changes), |
01c4224b | 561 | if_incoming, 0, bat_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
562 | } |
563 | ||
01c4224b ML |
564 | static void bat_iv_ogm_schedule(struct hard_iface *hard_iface, |
565 | int tt_num_changes) | |
b9dacc52 ML |
566 | { |
567 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
568 | struct batman_ogm_packet *batman_ogm_packet; | |
569 | struct hard_iface *primary_if; | |
570 | int vis_server; | |
571 | ||
572 | vis_server = atomic_read(&bat_priv->vis_mode); | |
573 | primary_if = primary_if_get_selected(bat_priv); | |
574 | ||
575 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; | |
576 | ||
577 | /* change sequence number to network order */ | |
578 | batman_ogm_packet->seqno = | |
579 | htonl((uint32_t)atomic_read(&hard_iface->seqno)); | |
580 | ||
581 | batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn); | |
66a1b2bc | 582 | batman_ogm_packet->tt_crc = htons(bat_priv->tt_crc); |
b9dacc52 ML |
583 | if (tt_num_changes >= 0) |
584 | batman_ogm_packet->tt_num_changes = tt_num_changes; | |
585 | ||
586 | if (vis_server == VIS_TYPE_SERVER_SYNC) | |
587 | batman_ogm_packet->flags |= VIS_SERVER; | |
588 | else | |
589 | batman_ogm_packet->flags &= ~VIS_SERVER; | |
590 | ||
591 | if ((hard_iface == primary_if) && | |
592 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) | |
593 | batman_ogm_packet->gw_flags = | |
594 | (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
595 | else | |
596 | batman_ogm_packet->gw_flags = NO_FLAGS; | |
597 | ||
598 | atomic_inc(&hard_iface->seqno); | |
599 | ||
600 | slide_own_bcast_window(hard_iface); | |
01c4224b ML |
601 | bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff, |
602 | hard_iface->packet_len, hard_iface, 1, | |
603 | bat_iv_ogm_emit_send_time(bat_priv)); | |
b9dacc52 ML |
604 | |
605 | if (primary_if) | |
606 | hardif_free_ref(primary_if); | |
607 | } | |
608 | ||
01c4224b ML |
609 | static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv, |
610 | struct orig_node *orig_node, | |
611 | const struct ethhdr *ethhdr, | |
612 | const struct batman_ogm_packet | |
fc957275 | 613 | *batman_ogm_packet, |
01c4224b ML |
614 | struct hard_iface *if_incoming, |
615 | const unsigned char *tt_buff, | |
616 | int is_duplicate) | |
fc957275 ML |
617 | { |
618 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
619 | struct neigh_node *router = NULL; | |
620 | struct orig_node *orig_node_tmp; | |
621 | struct hlist_node *node; | |
622 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; | |
623 | ||
86ceb360 SE |
624 | bat_dbg(DBG_BATMAN, bat_priv, |
625 | "update_originator(): Searching and updating originator entry of received packet\n"); | |
fc957275 ML |
626 | |
627 | rcu_read_lock(); | |
628 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
629 | &orig_node->neigh_list, list) { | |
630 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && | |
631 | (tmp_neigh_node->if_incoming == if_incoming) && | |
632 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
633 | if (neigh_node) | |
634 | neigh_node_free_ref(neigh_node); | |
635 | neigh_node = tmp_neigh_node; | |
636 | continue; | |
637 | } | |
638 | ||
639 | if (is_duplicate) | |
640 | continue; | |
641 | ||
e3b0d0de | 642 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
643 | ring_buffer_set(tmp_neigh_node->tq_recv, |
644 | &tmp_neigh_node->tq_index, 0); | |
645 | tmp_neigh_node->tq_avg = | |
646 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
e3b0d0de | 647 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
648 | } |
649 | ||
650 | if (!neigh_node) { | |
651 | struct orig_node *orig_tmp; | |
652 | ||
653 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
654 | if (!orig_tmp) | |
655 | goto unlock; | |
656 | ||
7ae8b285 ML |
657 | neigh_node = bat_iv_ogm_neigh_new(if_incoming, ethhdr->h_source, |
658 | orig_node, orig_tmp, | |
659 | batman_ogm_packet->seqno); | |
fc957275 ML |
660 | |
661 | orig_node_free_ref(orig_tmp); | |
662 | if (!neigh_node) | |
663 | goto unlock; | |
664 | } else | |
665 | bat_dbg(DBG_BATMAN, bat_priv, | |
666 | "Updating existing last-hop neighbor of originator\n"); | |
667 | ||
668 | rcu_read_unlock(); | |
669 | ||
670 | orig_node->flags = batman_ogm_packet->flags; | |
d7b2a97e | 671 | neigh_node->last_seen = jiffies; |
fc957275 | 672 | |
e3b0d0de | 673 | spin_lock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
674 | ring_buffer_set(neigh_node->tq_recv, |
675 | &neigh_node->tq_index, | |
676 | batman_ogm_packet->tq); | |
677 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
e3b0d0de | 678 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
679 | |
680 | if (!is_duplicate) { | |
76543d14 SE |
681 | orig_node->last_ttl = batman_ogm_packet->header.ttl; |
682 | neigh_node->last_ttl = batman_ogm_packet->header.ttl; | |
fc957275 ML |
683 | } |
684 | ||
685 | bonding_candidate_add(orig_node, neigh_node); | |
686 | ||
687 | /* if this neighbor already is our next hop there is nothing | |
688 | * to change */ | |
689 | router = orig_node_get_router(orig_node); | |
690 | if (router == neigh_node) | |
691 | goto update_tt; | |
692 | ||
693 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
694 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
695 | goto update_tt; | |
696 | ||
697 | /* if the TQ is the same and the link not more symmetric we | |
698 | * won't consider it either */ | |
699 | if (router && (neigh_node->tq_avg == router->tq_avg)) { | |
700 | orig_node_tmp = router->orig_node; | |
701 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
702 | bcast_own_sum_orig = | |
703 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
704 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
705 | ||
706 | orig_node_tmp = neigh_node->orig_node; | |
707 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
708 | bcast_own_sum_neigh = | |
709 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
710 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
711 | ||
712 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
713 | goto update_tt; | |
714 | } | |
715 | ||
716 | update_route(bat_priv, orig_node, neigh_node); | |
717 | ||
718 | update_tt: | |
719 | /* I have to check for transtable changes only if the OGM has been | |
720 | * sent through a primary interface */ | |
721 | if (((batman_ogm_packet->orig != ethhdr->h_source) && | |
76543d14 | 722 | (batman_ogm_packet->header.ttl > 2)) || |
fc957275 ML |
723 | (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
724 | tt_update_orig(bat_priv, orig_node, tt_buff, | |
725 | batman_ogm_packet->tt_num_changes, | |
726 | batman_ogm_packet->ttvn, | |
727 | batman_ogm_packet->tt_crc); | |
728 | ||
729 | if (orig_node->gw_flags != batman_ogm_packet->gw_flags) | |
730 | gw_node_update(bat_priv, orig_node, | |
731 | batman_ogm_packet->gw_flags); | |
732 | ||
733 | orig_node->gw_flags = batman_ogm_packet->gw_flags; | |
734 | ||
735 | /* restart gateway selection if fast or late switching was enabled */ | |
736 | if ((orig_node->gw_flags) && | |
737 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
738 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
739 | gw_check_election(bat_priv, orig_node); | |
740 | ||
741 | goto out; | |
742 | ||
743 | unlock: | |
744 | rcu_read_unlock(); | |
745 | out: | |
746 | if (neigh_node) | |
747 | neigh_node_free_ref(neigh_node); | |
748 | if (router) | |
749 | neigh_node_free_ref(router); | |
750 | } | |
751 | ||
01c4224b ML |
752 | static int bat_iv_ogm_calc_tq(struct orig_node *orig_node, |
753 | struct orig_node *orig_neigh_node, | |
754 | struct batman_ogm_packet *batman_ogm_packet, | |
755 | struct hard_iface *if_incoming) | |
fc957275 ML |
756 | { |
757 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
758 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
759 | struct hlist_node *node; | |
760 | uint8_t total_count; | |
761 | uint8_t orig_eq_count, neigh_rq_count, tq_own; | |
762 | int tq_asym_penalty, ret = 0; | |
763 | ||
764 | /* find corresponding one hop neighbor */ | |
765 | rcu_read_lock(); | |
766 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
767 | &orig_neigh_node->neigh_list, list) { | |
768 | ||
769 | if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig)) | |
770 | continue; | |
771 | ||
772 | if (tmp_neigh_node->if_incoming != if_incoming) | |
773 | continue; | |
774 | ||
775 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
776 | continue; | |
777 | ||
778 | neigh_node = tmp_neigh_node; | |
779 | break; | |
780 | } | |
781 | rcu_read_unlock(); | |
782 | ||
783 | if (!neigh_node) | |
7ae8b285 ML |
784 | neigh_node = bat_iv_ogm_neigh_new(if_incoming, |
785 | orig_neigh_node->orig, | |
786 | orig_neigh_node, | |
787 | orig_neigh_node, | |
788 | batman_ogm_packet->seqno); | |
fc957275 ML |
789 | |
790 | if (!neigh_node) | |
791 | goto out; | |
792 | ||
d7b2a97e | 793 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 794 | if (orig_node == orig_neigh_node) |
d7b2a97e | 795 | neigh_node->last_seen = jiffies; |
fc957275 | 796 | |
d7b2a97e | 797 | orig_node->last_seen = jiffies; |
fc957275 ML |
798 | |
799 | /* find packet count of corresponding one hop neighbor */ | |
800 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
801 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
802 | neigh_rq_count = neigh_node->real_packet_count; | |
803 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
804 | ||
805 | /* pay attention to not get a value bigger than 100 % */ | |
806 | total_count = (orig_eq_count > neigh_rq_count ? | |
807 | neigh_rq_count : orig_eq_count); | |
808 | ||
809 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
810 | /* if we receive too few packets it is not considered bidirectional */ | |
811 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
812 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) | |
813 | tq_own = 0; | |
814 | else | |
815 | /* neigh_node->real_packet_count is never zero as we | |
816 | * only purge old information when getting new | |
817 | * information */ | |
818 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; | |
819 | ||
21a1236b | 820 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
821 | * affect the nearly-symmetric links only a little, but |
822 | * punishes asymmetric links more. This will give a value | |
823 | * between 0 and TQ_MAX_VALUE | |
824 | */ | |
825 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * | |
826 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
827 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
828 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
829 | (TQ_LOCAL_WINDOW_SIZE * | |
830 | TQ_LOCAL_WINDOW_SIZE * | |
831 | TQ_LOCAL_WINDOW_SIZE); | |
832 | ||
833 | batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own | |
834 | * tq_asym_penalty) / | |
835 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
836 | ||
837 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 838 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
fc957275 ML |
839 | orig_node->orig, orig_neigh_node->orig, total_count, |
840 | neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq); | |
841 | ||
842 | /* if link has the minimum required transmission quality | |
843 | * consider it bidirectional */ | |
844 | if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
845 | ret = 1; | |
846 | ||
847 | out: | |
848 | if (neigh_node) | |
849 | neigh_node_free_ref(neigh_node); | |
850 | return ret; | |
851 | } | |
852 | ||
853 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
854 | * finds out whether it is a duplicate. | |
855 | * returns: | |
856 | * 1 the packet is a duplicate | |
857 | * 0 the packet has not yet been received | |
858 | * -1 the packet is old and has been received while the seqno window | |
859 | * was protected. Caller should drop it. | |
860 | */ | |
01c4224b ML |
861 | static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
862 | const struct batman_ogm_packet | |
fc957275 | 863 | *batman_ogm_packet, |
01c4224b | 864 | const struct hard_iface *if_incoming) |
fc957275 ML |
865 | { |
866 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
867 | struct orig_node *orig_node; | |
868 | struct neigh_node *tmp_neigh_node; | |
869 | struct hlist_node *node; | |
870 | int is_duplicate = 0; | |
871 | int32_t seq_diff; | |
872 | int need_update = 0; | |
873 | int set_mark, ret = -1; | |
e0f5211f | 874 | uint32_t seqno = ntohl(batman_ogm_packet->seqno); |
fc957275 ML |
875 | |
876 | orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig); | |
877 | if (!orig_node) | |
878 | return 0; | |
879 | ||
880 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 881 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
882 | |
883 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 AQ |
884 | if (!hlist_empty(&orig_node->neigh_list) && |
885 | window_protected(bat_priv, seq_diff, | |
fc957275 ML |
886 | &orig_node->batman_seqno_reset)) |
887 | goto out; | |
888 | ||
889 | rcu_read_lock(); | |
890 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
891 | &orig_node->neigh_list, list) { | |
892 | ||
0079d2ce SE |
893 | is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits, |
894 | orig_node->last_real_seqno, | |
e0f5211f | 895 | seqno); |
fc957275 ML |
896 | |
897 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && | |
898 | (tmp_neigh_node->if_incoming == if_incoming)) | |
899 | set_mark = 1; | |
900 | else | |
901 | set_mark = 0; | |
902 | ||
903 | /* if the window moved, set the update flag. */ | |
904 | need_update |= bit_get_packet(bat_priv, | |
905 | tmp_neigh_node->real_bits, | |
906 | seq_diff, set_mark); | |
907 | ||
908 | tmp_neigh_node->real_packet_count = | |
0079d2ce SE |
909 | bitmap_weight(tmp_neigh_node->real_bits, |
910 | TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
911 | } |
912 | rcu_read_unlock(); | |
913 | ||
914 | if (need_update) { | |
915 | bat_dbg(DBG_BATMAN, bat_priv, | |
c97c72b4 | 916 | "updating last_seqno: old %u, new %u\n", |
e0f5211f AV |
917 | orig_node->last_real_seqno, seqno); |
918 | orig_node->last_real_seqno = seqno; | |
fc957275 ML |
919 | } |
920 | ||
921 | ret = is_duplicate; | |
922 | ||
923 | out: | |
924 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
925 | orig_node_free_ref(orig_node); | |
926 | return ret; | |
927 | } | |
928 | ||
01c4224b ML |
929 | static void bat_iv_ogm_process(const struct ethhdr *ethhdr, |
930 | struct batman_ogm_packet *batman_ogm_packet, | |
931 | const unsigned char *tt_buff, | |
932 | struct hard_iface *if_incoming) | |
fc957275 ML |
933 | { |
934 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
935 | struct hard_iface *hard_iface; | |
936 | struct orig_node *orig_neigh_node, *orig_node; | |
937 | struct neigh_node *router = NULL, *router_router = NULL; | |
938 | struct neigh_node *orig_neigh_router = NULL; | |
939 | int has_directlink_flag; | |
940 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
75cd33f8 ML |
941 | int is_broadcast = 0, is_bidirectional; |
942 | bool is_single_hop_neigh = false; | |
13b2541b | 943 | bool is_from_best_next_hop = false; |
fc957275 ML |
944 | int is_duplicate; |
945 | uint32_t if_incoming_seqno; | |
946 | ||
947 | /* Silently drop when the batman packet is actually not a | |
948 | * correct packet. | |
949 | * | |
950 | * This might happen if a packet is padded (e.g. Ethernet has a | |
951 | * minimum frame length of 64 byte) and the aggregation interprets | |
952 | * it as an additional length. | |
953 | * | |
954 | * TODO: A more sane solution would be to have a bit in the | |
955 | * batman_ogm_packet to detect whether the packet is the last | |
956 | * packet in an aggregation. Here we expect that the padding | |
957 | * is always zero (or not 0x01) | |
958 | */ | |
1eeb479f | 959 | if (batman_ogm_packet->header.packet_type != BAT_IV_OGM) |
fc957275 ML |
960 | return; |
961 | ||
962 | /* could be changed by schedule_own_packet() */ | |
963 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
964 | ||
965 | has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
966 | ||
75cd33f8 ML |
967 | if (compare_eth(ethhdr->h_source, batman_ogm_packet->orig)) |
968 | is_single_hop_neigh = true; | |
fc957275 ML |
969 | |
970 | bat_dbg(DBG_BATMAN, bat_priv, | |
c97c72b4 | 971 | "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", |
fc957275 ML |
972 | ethhdr->h_source, if_incoming->net_dev->name, |
973 | if_incoming->net_dev->dev_addr, batman_ogm_packet->orig, | |
e0f5211f | 974 | batman_ogm_packet->prev_sender, ntohl(batman_ogm_packet->seqno), |
fc957275 ML |
975 | batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc, |
976 | batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq, | |
76543d14 SE |
977 | batman_ogm_packet->header.ttl, |
978 | batman_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
979 | |
980 | rcu_read_lock(); | |
981 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { | |
982 | if (hard_iface->if_status != IF_ACTIVE) | |
983 | continue; | |
984 | ||
985 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
986 | continue; | |
987 | ||
988 | if (compare_eth(ethhdr->h_source, | |
989 | hard_iface->net_dev->dev_addr)) | |
990 | is_my_addr = 1; | |
991 | ||
992 | if (compare_eth(batman_ogm_packet->orig, | |
993 | hard_iface->net_dev->dev_addr)) | |
994 | is_my_orig = 1; | |
995 | ||
996 | if (compare_eth(batman_ogm_packet->prev_sender, | |
997 | hard_iface->net_dev->dev_addr)) | |
998 | is_my_oldorig = 1; | |
999 | ||
1000 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1001 | is_broadcast = 1; | |
1002 | } | |
1003 | rcu_read_unlock(); | |
1004 | ||
76543d14 | 1005 | if (batman_ogm_packet->header.version != COMPAT_VERSION) { |
fc957275 ML |
1006 | bat_dbg(DBG_BATMAN, bat_priv, |
1007 | "Drop packet: incompatible batman version (%i)\n", | |
76543d14 | 1008 | batman_ogm_packet->header.version); |
fc957275 ML |
1009 | return; |
1010 | } | |
1011 | ||
1012 | if (is_my_addr) { | |
1013 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 1014 | "Drop packet: received my own broadcast (sender: %pM)\n", |
fc957275 ML |
1015 | ethhdr->h_source); |
1016 | return; | |
1017 | } | |
1018 | ||
1019 | if (is_broadcast) { | |
86ceb360 SE |
1020 | bat_dbg(DBG_BATMAN, bat_priv, |
1021 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", | |
1022 | ethhdr->h_source); | |
fc957275 ML |
1023 | return; |
1024 | } | |
1025 | ||
1026 | if (is_my_orig) { | |
1027 | unsigned long *word; | |
1028 | int offset; | |
1029 | ||
1030 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
1031 | if (!orig_neigh_node) | |
1032 | return; | |
1033 | ||
1034 | /* neighbor has to indicate direct link and it has to | |
1035 | * come via the corresponding interface */ | |
1036 | /* save packet seqno for bidirectional check */ | |
1037 | if (has_directlink_flag && | |
1038 | compare_eth(if_incoming->net_dev->dev_addr, | |
1039 | batman_ogm_packet->orig)) { | |
1040 | offset = if_incoming->if_num * NUM_WORDS; | |
1041 | ||
1042 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1043 | word = &(orig_neigh_node->bcast_own[offset]); | |
0079d2ce SE |
1044 | bat_set_bit(word, |
1045 | if_incoming_seqno - | |
e0f5211f | 1046 | ntohl(batman_ogm_packet->seqno) - 2); |
fc957275 | 1047 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = |
0079d2ce | 1048 | bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE); |
fc957275 ML |
1049 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1050 | } | |
1051 | ||
86ceb360 SE |
1052 | bat_dbg(DBG_BATMAN, bat_priv, |
1053 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
fc957275 ML |
1054 | orig_node_free_ref(orig_neigh_node); |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | if (is_my_oldorig) { | |
1059 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
1060 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1061 | ethhdr->h_source); | |
fc957275 ML |
1062 | return; |
1063 | } | |
1064 | ||
13b2541b ML |
1065 | if (batman_ogm_packet->flags & NOT_BEST_NEXT_HOP) { |
1066 | bat_dbg(DBG_BATMAN, bat_priv, | |
fefa5329 ML |
1067 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1068 | ethhdr->h_source); | |
13b2541b ML |
1069 | return; |
1070 | } | |
1071 | ||
fc957275 ML |
1072 | orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig); |
1073 | if (!orig_node) | |
1074 | return; | |
1075 | ||
01c4224b ML |
1076 | is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet, |
1077 | if_incoming); | |
fc957275 ML |
1078 | |
1079 | if (is_duplicate == -1) { | |
1080 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
1081 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1082 | ethhdr->h_source); | |
fc957275 ML |
1083 | goto out; |
1084 | } | |
1085 | ||
1086 | if (batman_ogm_packet->tq == 0) { | |
1087 | bat_dbg(DBG_BATMAN, bat_priv, | |
1088 | "Drop packet: originator packet with tq equal 0\n"); | |
1089 | goto out; | |
1090 | } | |
1091 | ||
1092 | router = orig_node_get_router(orig_node); | |
1093 | if (router) | |
1094 | router_router = orig_node_get_router(router->orig_node); | |
1095 | ||
13b2541b ML |
1096 | if ((router && router->tq_avg != 0) && |
1097 | (compare_eth(router->addr, ethhdr->h_source))) | |
1098 | is_from_best_next_hop = true; | |
1099 | ||
fc957275 ML |
1100 | /* avoid temporary routing loops */ |
1101 | if (router && router_router && | |
1102 | (compare_eth(router->addr, batman_ogm_packet->prev_sender)) && | |
1103 | !(compare_eth(batman_ogm_packet->orig, | |
1104 | batman_ogm_packet->prev_sender)) && | |
1105 | (compare_eth(router->addr, router_router->addr))) { | |
1106 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
1107 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1108 | ethhdr->h_source); | |
fc957275 ML |
1109 | goto out; |
1110 | } | |
1111 | ||
1112 | /* if sender is a direct neighbor the sender mac equals | |
1113 | * originator mac */ | |
1114 | orig_neigh_node = (is_single_hop_neigh ? | |
1115 | orig_node : | |
1116 | get_orig_node(bat_priv, ethhdr->h_source)); | |
1117 | if (!orig_neigh_node) | |
1118 | goto out; | |
1119 | ||
1120 | orig_neigh_router = orig_node_get_router(orig_neigh_node); | |
1121 | ||
1122 | /* drop packet if sender is not a direct neighbor and if we | |
1123 | * don't route towards it */ | |
1124 | if (!is_single_hop_neigh && (!orig_neigh_router)) { | |
1125 | bat_dbg(DBG_BATMAN, bat_priv, | |
1126 | "Drop packet: OGM via unknown neighbor!\n"); | |
1127 | goto out_neigh; | |
1128 | } | |
1129 | ||
01c4224b ML |
1130 | is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
1131 | batman_ogm_packet, if_incoming); | |
fc957275 ML |
1132 | |
1133 | bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet); | |
1134 | ||
1135 | /* update ranking if it is not a duplicate or has the same | |
1136 | * seqno and similar ttl as the non-duplicate */ | |
1137 | if (is_bidirectional && | |
1138 | (!is_duplicate || | |
e0f5211f | 1139 | ((orig_node->last_real_seqno == ntohl(batman_ogm_packet->seqno)) && |
76543d14 | 1140 | (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl)))) |
01c4224b ML |
1141 | bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, |
1142 | batman_ogm_packet, if_incoming, | |
1143 | tt_buff, is_duplicate); | |
fc957275 ML |
1144 | |
1145 | /* is single hop (direct) neighbor */ | |
1146 | if (is_single_hop_neigh) { | |
1147 | ||
1148 | /* mark direct link on incoming interface */ | |
01c4224b | 1149 | bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
13b2541b ML |
1150 | is_single_hop_neigh, is_from_best_next_hop, |
1151 | if_incoming); | |
fc957275 | 1152 | |
86ceb360 SE |
1153 | bat_dbg(DBG_BATMAN, bat_priv, |
1154 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); | |
fc957275 ML |
1155 | goto out_neigh; |
1156 | } | |
1157 | ||
1158 | /* multihop originator */ | |
1159 | if (!is_bidirectional) { | |
1160 | bat_dbg(DBG_BATMAN, bat_priv, | |
1161 | "Drop packet: not received via bidirectional link\n"); | |
1162 | goto out_neigh; | |
1163 | } | |
1164 | ||
1165 | if (is_duplicate) { | |
1166 | bat_dbg(DBG_BATMAN, bat_priv, | |
1167 | "Drop packet: duplicate packet received\n"); | |
1168 | goto out_neigh; | |
1169 | } | |
1170 | ||
1171 | bat_dbg(DBG_BATMAN, bat_priv, | |
1172 | "Forwarding packet: rebroadcast originator packet\n"); | |
01c4224b | 1173 | bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
13b2541b ML |
1174 | is_single_hop_neigh, is_from_best_next_hop, |
1175 | if_incoming); | |
fc957275 ML |
1176 | |
1177 | out_neigh: | |
1178 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
1179 | orig_node_free_ref(orig_neigh_node); | |
1180 | out: | |
1181 | if (router) | |
1182 | neigh_node_free_ref(router); | |
1183 | if (router_router) | |
1184 | neigh_node_free_ref(router_router); | |
1185 | if (orig_neigh_router) | |
1186 | neigh_node_free_ref(orig_neigh_router); | |
1187 | ||
1188 | orig_node_free_ref(orig_node); | |
1189 | } | |
1190 | ||
c3e29312 ML |
1191 | static int bat_iv_ogm_receive(struct sk_buff *skb, |
1192 | struct hard_iface *if_incoming) | |
fc957275 | 1193 | { |
edbf12ba | 1194 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
fc957275 | 1195 | struct batman_ogm_packet *batman_ogm_packet; |
8780dad9 ML |
1196 | struct ethhdr *ethhdr; |
1197 | int buff_pos = 0, packet_len; | |
1198 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 ML |
1199 | bool ret; |
1200 | ||
1201 | ret = check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN); | |
1202 | if (!ret) | |
1203 | return NET_RX_DROP; | |
fc957275 | 1204 | |
edbf12ba ML |
1205 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1206 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1207 | */ | |
1208 | if (bat_priv->bat_algo_ops->bat_ogm_emit != bat_iv_ogm_emit) | |
1209 | return NET_RX_DROP; | |
1210 | ||
f8214865 MH |
1211 | batadv_inc_counter(bat_priv, BAT_CNT_MGMT_RX); |
1212 | batadv_add_counter(bat_priv, BAT_CNT_MGMT_RX_BYTES, | |
1213 | skb->len + ETH_HLEN); | |
1214 | ||
8780dad9 ML |
1215 | packet_len = skb_headlen(skb); |
1216 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1217 | packet_buff = skb->data; | |
fc957275 ML |
1218 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; |
1219 | ||
1220 | /* unpack the aggregated packets and process them one by one */ | |
1221 | do { | |
1222 | /* network to host order for our 32bit seqno and the | |
1223 | orig_interval */ | |
fc957275 ML |
1224 | batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc); |
1225 | ||
76e3d7fc | 1226 | tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN; |
fc957275 | 1227 | |
01c4224b ML |
1228 | bat_iv_ogm_process(ethhdr, batman_ogm_packet, |
1229 | tt_buff, if_incoming); | |
fc957275 | 1230 | |
76e3d7fc | 1231 | buff_pos += BATMAN_OGM_HLEN + |
fc957275 ML |
1232 | tt_len(batman_ogm_packet->tt_num_changes); |
1233 | ||
1234 | batman_ogm_packet = (struct batman_ogm_packet *) | |
1235 | (packet_buff + buff_pos); | |
01c4224b ML |
1236 | } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len, |
1237 | batman_ogm_packet->tt_num_changes)); | |
c3e29312 ML |
1238 | |
1239 | kfree_skb(skb); | |
1240 | return NET_RX_SUCCESS; | |
fc957275 | 1241 | } |
1c280471 ML |
1242 | |
1243 | static struct bat_algo_ops batman_iv __read_mostly = { | |
519d3497 | 1244 | .name = "BATMAN_IV", |
c2aca022 | 1245 | .bat_iface_enable = bat_iv_ogm_iface_enable, |
00a50076 | 1246 | .bat_iface_disable = bat_iv_ogm_iface_disable, |
c3229398 | 1247 | .bat_iface_update_mac = bat_iv_ogm_iface_update_mac, |
cd8b78e7 | 1248 | .bat_primary_iface_set = bat_iv_ogm_primary_iface_set, |
01c4224b ML |
1249 | .bat_ogm_schedule = bat_iv_ogm_schedule, |
1250 | .bat_ogm_emit = bat_iv_ogm_emit, | |
1c280471 ML |
1251 | }; |
1252 | ||
1253 | int __init bat_iv_init(void) | |
1254 | { | |
c3e29312 ML |
1255 | int ret; |
1256 | ||
1257 | /* batman originator packet */ | |
1258 | ret = recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive); | |
1259 | if (ret < 0) | |
1260 | goto out; | |
1261 | ||
1262 | ret = bat_algo_register(&batman_iv); | |
1263 | if (ret < 0) | |
1264 | goto handler_unregister; | |
1265 | ||
1266 | goto out; | |
1267 | ||
1268 | handler_unregister: | |
1269 | recv_handler_unregister(BAT_IV_OGM); | |
1270 | out: | |
1271 | return ret; | |
1c280471 | 1272 | } |