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 | |
7ae8b285 ML |
31 | static struct neigh_node *bat_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, | |
e0f5211f | 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 | ||
77af7575 | 57 | static int bat_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 | |
76e3d7fc | 67 | hard_iface->packet_len = BATMAN_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; |
76543d14 SE |
75 | batman_ogm_packet->header.version = COMPAT_VERSION; |
76 | batman_ogm_packet->header.ttl = 2; | |
d0b9fd89 | 77 | batman_ogm_packet->flags = NO_FLAGS; |
d0b9fd89 ML |
78 | batman_ogm_packet->tq = TQ_MAX_VALUE; |
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 | ||
00a50076 ML |
88 | static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface) |
89 | { | |
90 | kfree(hard_iface->packet_buff); | |
91 | hard_iface->packet_buff = NULL; | |
92 | } | |
93 | ||
c3229398 | 94 | static void bat_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 | ||
c3229398 | 105 | static void bat_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 ML |
110 | batman_ogm_packet->flags = PRIMARIES_FIRST_HOP; |
111 | batman_ogm_packet->header.ttl = TTL; | |
d0b9fd89 ML |
112 | } |
113 | ||
b9dacc52 | 114 | /* when do we schedule our own ogm to be sent */ |
01c4224b | 115 | static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv) |
b9dacc52 ML |
116 | { |
117 | return jiffies + msecs_to_jiffies( | |
118 | atomic_read(&bat_priv->orig_interval) - | |
119 | JITTER + (random32() % 2*JITTER)); | |
120 | } | |
121 | ||
122 | /* when do we schedule a ogm packet to be sent */ | |
01c4224b | 123 | static unsigned long bat_iv_ogm_fwd_send_time(void) |
b9dacc52 ML |
124 | { |
125 | return jiffies + msecs_to_jiffies(random32() % (JITTER/2)); | |
126 | } | |
127 | ||
128 | /* apply hop penalty for a normal link */ | |
129 | static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv) | |
130 | { | |
131 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
132 | return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE); | |
133 | } | |
134 | ||
fc957275 | 135 | /* is there another aggregated packet here? */ |
01c4224b ML |
136 | static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
137 | int tt_num_changes) | |
fc957275 | 138 | { |
08c36d3e SE |
139 | int next_buff_pos = 0; |
140 | ||
141 | next_buff_pos += buff_pos + BATMAN_OGM_HLEN; | |
142 | next_buff_pos += batadv_tt_len(tt_num_changes); | |
fc957275 ML |
143 | |
144 | return (next_buff_pos <= packet_len) && | |
145 | (next_buff_pos <= MAX_AGGREGATION_BYTES); | |
146 | } | |
147 | ||
b9dacc52 | 148 | /* send a batman ogm to a given interface */ |
01c4224b ML |
149 | static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet, |
150 | struct hard_iface *hard_iface) | |
b9dacc52 ML |
151 | { |
152 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
153 | char *fwd_str; | |
154 | uint8_t packet_num; | |
155 | int16_t buff_pos; | |
156 | struct batman_ogm_packet *batman_ogm_packet; | |
157 | struct sk_buff *skb; | |
158 | ||
159 | if (hard_iface->if_status != IF_ACTIVE) | |
160 | return; | |
161 | ||
162 | packet_num = 0; | |
163 | buff_pos = 0; | |
164 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
165 | ||
166 | /* adjust all flags and log packets */ | |
01c4224b ML |
167 | while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
168 | batman_ogm_packet->tt_num_changes)) { | |
b9dacc52 ML |
169 | |
170 | /* we might have aggregated direct link packets with an | |
9cfc7bd6 SE |
171 | * ordinary base packet |
172 | */ | |
b9dacc52 ML |
173 | if ((forw_packet->direct_link_flags & (1 << packet_num)) && |
174 | (forw_packet->if_incoming == hard_iface)) | |
175 | batman_ogm_packet->flags |= DIRECTLINK; | |
176 | else | |
177 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
178 | ||
179 | fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? | |
180 | "Sending own" : | |
181 | "Forwarding")); | |
1eda58bf SE |
182 | batadv_dbg(DBG_BATMAN, bat_priv, |
183 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", | |
184 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
185 | batman_ogm_packet->orig, | |
186 | ntohl(batman_ogm_packet->seqno), | |
187 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl, | |
188 | (batman_ogm_packet->flags & DIRECTLINK ? | |
189 | "on" : "off"), | |
190 | batman_ogm_packet->ttvn, hard_iface->net_dev->name, | |
191 | hard_iface->net_dev->dev_addr); | |
b9dacc52 | 192 | |
08c36d3e SE |
193 | buff_pos += BATMAN_OGM_HLEN; |
194 | buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes); | |
b9dacc52 ML |
195 | packet_num++; |
196 | batman_ogm_packet = (struct batman_ogm_packet *) | |
197 | (forw_packet->skb->data + buff_pos); | |
198 | } | |
199 | ||
200 | /* create clone because function is called more than once */ | |
201 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 MH |
202 | if (skb) { |
203 | batadv_inc_counter(bat_priv, BAT_CNT_MGMT_TX); | |
204 | batadv_add_counter(bat_priv, BAT_CNT_MGMT_TX_BYTES, | |
205 | skb->len + ETH_HLEN); | |
3193e8fd | 206 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 207 | } |
b9dacc52 ML |
208 | } |
209 | ||
210 | /* send a batman ogm packet */ | |
01c4224b | 211 | static void bat_iv_ogm_emit(struct forw_packet *forw_packet) |
b9dacc52 ML |
212 | { |
213 | struct hard_iface *hard_iface; | |
214 | struct net_device *soft_iface; | |
215 | struct bat_priv *bat_priv; | |
216 | struct hard_iface *primary_if = NULL; | |
217 | struct batman_ogm_packet *batman_ogm_packet; | |
218 | unsigned char directlink; | |
219 | ||
220 | batman_ogm_packet = (struct batman_ogm_packet *) | |
221 | (forw_packet->skb->data); | |
222 | directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
223 | ||
224 | if (!forw_packet->if_incoming) { | |
86ceb360 | 225 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
226 | goto out; |
227 | } | |
228 | ||
229 | soft_iface = forw_packet->if_incoming->soft_iface; | |
230 | bat_priv = netdev_priv(soft_iface); | |
231 | ||
232 | if (forw_packet->if_incoming->if_status != IF_ACTIVE) | |
233 | goto out; | |
234 | ||
e5d89254 | 235 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
236 | if (!primary_if) |
237 | goto out; | |
238 | ||
9cfc7bd6 SE |
239 | /* multihomed peer assumed |
240 | * non-primary OGMs are only broadcasted on their interface | |
241 | */ | |
76543d14 | 242 | if ((directlink && (batman_ogm_packet->header.ttl == 1)) || |
b9dacc52 ML |
243 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
244 | ||
245 | /* FIXME: what about aggregated packets ? */ | |
1eda58bf SE |
246 | batadv_dbg(DBG_BATMAN, bat_priv, |
247 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", | |
248 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
249 | batman_ogm_packet->orig, | |
250 | ntohl(batman_ogm_packet->seqno), | |
251 | batman_ogm_packet->header.ttl, | |
252 | forw_packet->if_incoming->net_dev->name, | |
253 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
254 | |
255 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
256 | batadv_send_skb_packet(forw_packet->skb, |
257 | forw_packet->if_incoming, | |
3193e8fd | 258 | batadv_broadcast_addr); |
b9dacc52 ML |
259 | forw_packet->skb = NULL; |
260 | ||
261 | goto out; | |
262 | } | |
263 | ||
264 | /* broadcast on every interface */ | |
265 | rcu_read_lock(); | |
3193e8fd | 266 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
267 | if (hard_iface->soft_iface != soft_iface) |
268 | continue; | |
269 | ||
01c4224b | 270 | bat_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
271 | } |
272 | rcu_read_unlock(); | |
273 | ||
274 | out: | |
275 | if (primary_if) | |
e5d89254 | 276 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
277 | } |
278 | ||
279 | /* return true if new_packet can be aggregated with forw_packet */ | |
01c4224b | 280 | static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet |
b9dacc52 | 281 | *new_batman_ogm_packet, |
01c4224b ML |
282 | struct bat_priv *bat_priv, |
283 | int packet_len, unsigned long send_time, | |
284 | bool directlink, | |
285 | const struct hard_iface *if_incoming, | |
286 | const struct forw_packet *forw_packet) | |
b9dacc52 ML |
287 | { |
288 | struct batman_ogm_packet *batman_ogm_packet; | |
289 | int aggregated_bytes = forw_packet->packet_len + packet_len; | |
290 | struct hard_iface *primary_if = NULL; | |
291 | bool res = false; | |
292 | ||
293 | batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data; | |
294 | ||
9cfc7bd6 | 295 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
296 | * if: |
297 | * | |
298 | * - the send time is within our MAX_AGGREGATION_MS time | |
299 | * - the resulting packet wont be bigger than | |
300 | * MAX_AGGREGATION_BYTES | |
301 | */ | |
b9dacc52 ML |
302 | if (time_before(send_time, forw_packet->send_time) && |
303 | time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS), | |
304 | forw_packet->send_time) && | |
305 | (aggregated_bytes <= MAX_AGGREGATION_BYTES)) { | |
306 | ||
9cfc7bd6 | 307 | /* check aggregation compatibility |
b9dacc52 ML |
308 | * -> direct link packets are broadcasted on |
309 | * their interface only | |
310 | * -> aggregate packet if the current packet is | |
311 | * a "global" packet as well as the base | |
312 | * packet | |
313 | */ | |
e5d89254 | 314 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
315 | if (!primary_if) |
316 | goto out; | |
317 | ||
318 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
319 | * are flooded through the net |
320 | */ | |
b9dacc52 ML |
321 | if ((!directlink) && |
322 | (!(batman_ogm_packet->flags & DIRECTLINK)) && | |
76543d14 | 323 | (batman_ogm_packet->header.ttl != 1) && |
b9dacc52 ML |
324 | |
325 | /* own packets originating non-primary | |
9cfc7bd6 SE |
326 | * interfaces leave only that interface |
327 | */ | |
b9dacc52 ML |
328 | ((!forw_packet->own) || |
329 | (forw_packet->if_incoming == primary_if))) { | |
330 | res = true; | |
331 | goto out; | |
332 | } | |
333 | ||
334 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
335 | * interface only - we still can aggregate |
336 | */ | |
b9dacc52 | 337 | if ((directlink) && |
76543d14 | 338 | (new_batman_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
339 | (forw_packet->if_incoming == if_incoming) && |
340 | ||
341 | /* packets from direct neighbors or | |
342 | * own secondary interface packets | |
9cfc7bd6 SE |
343 | * (= secondary interface packets in general) |
344 | */ | |
b9dacc52 ML |
345 | (batman_ogm_packet->flags & DIRECTLINK || |
346 | (forw_packet->own && | |
347 | forw_packet->if_incoming != primary_if))) { | |
348 | res = true; | |
349 | goto out; | |
350 | } | |
351 | } | |
352 | ||
353 | out: | |
354 | if (primary_if) | |
e5d89254 | 355 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
356 | return res; |
357 | } | |
358 | ||
359 | /* create a new aggregated packet and add this packet to it */ | |
01c4224b ML |
360 | static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
361 | int packet_len, unsigned long send_time, | |
362 | bool direct_link, | |
363 | struct hard_iface *if_incoming, | |
364 | int own_packet) | |
b9dacc52 ML |
365 | { |
366 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
367 | struct forw_packet *forw_packet_aggr; | |
368 | unsigned char *skb_buff; | |
369 | ||
370 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
371 | return; | |
372 | ||
373 | /* own packet should always be scheduled */ | |
374 | if (!own_packet) { | |
375 | if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) { | |
1eda58bf SE |
376 | batadv_dbg(DBG_BATMAN, bat_priv, |
377 | "batman packet queue full\n"); | |
b9dacc52 ML |
378 | goto out; |
379 | } | |
380 | } | |
381 | ||
382 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
383 | if (!forw_packet_aggr) { | |
384 | if (!own_packet) | |
385 | atomic_inc(&bat_priv->batman_queue_left); | |
386 | goto out; | |
387 | } | |
388 | ||
389 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
390 | (packet_len < MAX_AGGREGATION_BYTES)) | |
391 | forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES + | |
0d125074 | 392 | ETH_HLEN); |
b9dacc52 | 393 | else |
0d125074 | 394 | forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN); |
b9dacc52 ML |
395 | |
396 | if (!forw_packet_aggr->skb) { | |
397 | if (!own_packet) | |
398 | atomic_inc(&bat_priv->batman_queue_left); | |
399 | kfree(forw_packet_aggr); | |
400 | goto out; | |
401 | } | |
0d125074 | 402 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 ML |
403 | |
404 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
405 | ||
406 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
407 | forw_packet_aggr->packet_len = packet_len; | |
408 | memcpy(skb_buff, packet_buff, packet_len); | |
409 | ||
410 | forw_packet_aggr->own = own_packet; | |
411 | forw_packet_aggr->if_incoming = if_incoming; | |
412 | forw_packet_aggr->num_packets = 0; | |
413 | forw_packet_aggr->direct_link_flags = NO_FLAGS; | |
414 | forw_packet_aggr->send_time = send_time; | |
415 | ||
416 | /* save packet direct link flag status */ | |
417 | if (direct_link) | |
418 | forw_packet_aggr->direct_link_flags |= 1; | |
419 | ||
420 | /* add new packet to packet list */ | |
421 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
422 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
423 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
424 | ||
425 | /* start timer for this packet */ | |
426 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 427 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 428 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
429 | &forw_packet_aggr->delayed_work, |
430 | send_time - jiffies); | |
431 | ||
432 | return; | |
433 | out: | |
e5d89254 | 434 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
435 | } |
436 | ||
437 | /* aggregate a new packet into the existing ogm packet */ | |
01c4224b ML |
438 | static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr, |
439 | const unsigned char *packet_buff, | |
440 | int packet_len, bool direct_link) | |
b9dacc52 ML |
441 | { |
442 | unsigned char *skb_buff; | |
443 | ||
444 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
445 | memcpy(skb_buff, packet_buff, packet_len); | |
446 | forw_packet_aggr->packet_len += packet_len; | |
447 | forw_packet_aggr->num_packets++; | |
448 | ||
449 | /* save packet direct link flag status */ | |
450 | if (direct_link) | |
451 | forw_packet_aggr->direct_link_flags |= | |
452 | (1 << forw_packet_aggr->num_packets); | |
453 | } | |
454 | ||
01c4224b ML |
455 | static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv, |
456 | unsigned char *packet_buff, | |
457 | int packet_len, struct hard_iface *if_incoming, | |
458 | int own_packet, unsigned long send_time) | |
b9dacc52 | 459 | { |
9cfc7bd6 | 460 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
461 | * _pos -> pointer to the position in the queue |
462 | */ | |
463 | struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL; | |
464 | struct hlist_node *tmp_node; | |
465 | struct batman_ogm_packet *batman_ogm_packet; | |
466 | bool direct_link; | |
467 | ||
468 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; | |
469 | direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0; | |
470 | ||
471 | /* find position for the packet in the forward queue */ | |
472 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
473 | /* own packets are not to be aggregated */ | |
474 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
475 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
476 | &bat_priv->forw_bat_list, list) { | |
01c4224b ML |
477 | if (bat_iv_ogm_can_aggregate(batman_ogm_packet, |
478 | bat_priv, packet_len, | |
479 | send_time, direct_link, | |
480 | if_incoming, | |
481 | forw_packet_pos)) { | |
b9dacc52 ML |
482 | forw_packet_aggr = forw_packet_pos; |
483 | break; | |
484 | } | |
485 | } | |
486 | } | |
487 | ||
488 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
489 | * suitable aggregation packet found |
490 | */ | |
b9dacc52 ML |
491 | if (!forw_packet_aggr) { |
492 | /* the following section can run without the lock */ | |
493 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
494 | ||
9cfc7bd6 | 495 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
496 | * we hold it back for a while, so that it might be aggregated |
497 | * later on | |
498 | */ | |
499 | if ((!own_packet) && | |
500 | (atomic_read(&bat_priv->aggregated_ogms))) | |
501 | send_time += msecs_to_jiffies(MAX_AGGREGATION_MS); | |
502 | ||
01c4224b ML |
503 | bat_iv_ogm_aggregate_new(packet_buff, packet_len, |
504 | send_time, direct_link, | |
505 | if_incoming, own_packet); | |
b9dacc52 | 506 | } else { |
01c4224b ML |
507 | bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
508 | packet_len, direct_link); | |
b9dacc52 ML |
509 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
510 | } | |
511 | } | |
512 | ||
01c4224b ML |
513 | static void bat_iv_ogm_forward(struct orig_node *orig_node, |
514 | const struct ethhdr *ethhdr, | |
515 | struct batman_ogm_packet *batman_ogm_packet, | |
75cd33f8 | 516 | bool is_single_hop_neigh, |
13b2541b | 517 | bool is_from_best_next_hop, |
75cd33f8 | 518 | struct hard_iface *if_incoming) |
b9dacc52 ML |
519 | { |
520 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
b9dacc52 ML |
521 | uint8_t tt_num_changes; |
522 | ||
76543d14 | 523 | if (batman_ogm_packet->header.ttl <= 1) { |
1eda58bf | 524 | batadv_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
525 | return; |
526 | } | |
527 | ||
13b2541b ML |
528 | if (!is_from_best_next_hop) { |
529 | /* Mark the forwarded packet when it is not coming from our | |
530 | * best next hop. We still need to forward the packet for our | |
531 | * neighbor link quality detection to work in case the packet | |
532 | * originated from a single hop neighbor. Otherwise we can | |
533 | * simply drop the ogm. | |
534 | */ | |
535 | if (is_single_hop_neigh) | |
536 | batman_ogm_packet->flags |= NOT_BEST_NEXT_HOP; | |
537 | else | |
538 | return; | |
539 | } | |
b9dacc52 | 540 | |
b9dacc52 ML |
541 | tt_num_changes = batman_ogm_packet->tt_num_changes; |
542 | ||
76543d14 | 543 | batman_ogm_packet->header.ttl--; |
b9dacc52 ML |
544 | memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
545 | ||
b9dacc52 ML |
546 | /* apply hop penalty */ |
547 | batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv); | |
548 | ||
1eda58bf SE |
549 | batadv_dbg(DBG_BATMAN, bat_priv, |
550 | "Forwarding packet: tq: %i, ttl: %i\n", | |
551 | batman_ogm_packet->tq, batman_ogm_packet->header.ttl); | |
b9dacc52 | 552 | |
b9dacc52 ML |
553 | /* switch of primaries first hop flag when forwarding */ |
554 | batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP; | |
75cd33f8 | 555 | if (is_single_hop_neigh) |
b9dacc52 ML |
556 | batman_ogm_packet->flags |= DIRECTLINK; |
557 | else | |
558 | batman_ogm_packet->flags &= ~DIRECTLINK; | |
559 | ||
01c4224b | 560 | bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet, |
08c36d3e | 561 | BATMAN_OGM_HLEN + batadv_tt_len(tt_num_changes), |
01c4224b | 562 | if_incoming, 0, bat_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
563 | } |
564 | ||
be9aa4c1 | 565 | static void bat_iv_ogm_schedule(struct hard_iface *hard_iface) |
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; | |
be9aa4c1 | 570 | int vis_server, tt_num_changes = 0; |
b9dacc52 ML |
571 | |
572 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 573 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 574 | |
be9aa4c1 ML |
575 | if (hard_iface == primary_if) |
576 | tt_num_changes = batadv_tt_append_diff(bat_priv, | |
577 | &hard_iface->packet_buff, | |
578 | &hard_iface->packet_len, | |
579 | BATMAN_OGM_HLEN); | |
580 | ||
b9dacc52 ML |
581 | batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff; |
582 | ||
583 | /* change sequence number to network order */ | |
584 | batman_ogm_packet->seqno = | |
585 | htonl((uint32_t)atomic_read(&hard_iface->seqno)); | |
be9aa4c1 | 586 | atomic_inc(&hard_iface->seqno); |
b9dacc52 ML |
587 | |
588 | batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn); | |
66a1b2bc | 589 | batman_ogm_packet->tt_crc = htons(bat_priv->tt_crc); |
b9dacc52 ML |
590 | if (tt_num_changes >= 0) |
591 | batman_ogm_packet->tt_num_changes = tt_num_changes; | |
592 | ||
593 | if (vis_server == VIS_TYPE_SERVER_SYNC) | |
594 | batman_ogm_packet->flags |= VIS_SERVER; | |
595 | else | |
596 | batman_ogm_packet->flags &= ~VIS_SERVER; | |
597 | ||
598 | if ((hard_iface == primary_if) && | |
599 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) | |
600 | batman_ogm_packet->gw_flags = | |
601 | (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
602 | else | |
603 | batman_ogm_packet->gw_flags = NO_FLAGS; | |
604 | ||
30d3c511 | 605 | batadv_slide_own_bcast_window(hard_iface); |
01c4224b ML |
606 | bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff, |
607 | hard_iface->packet_len, hard_iface, 1, | |
608 | bat_iv_ogm_emit_send_time(bat_priv)); | |
b9dacc52 ML |
609 | |
610 | if (primary_if) | |
e5d89254 | 611 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
612 | } |
613 | ||
01c4224b ML |
614 | static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv, |
615 | struct orig_node *orig_node, | |
616 | const struct ethhdr *ethhdr, | |
617 | const struct batman_ogm_packet | |
fc957275 | 618 | *batman_ogm_packet, |
01c4224b ML |
619 | struct hard_iface *if_incoming, |
620 | const unsigned char *tt_buff, | |
621 | int is_duplicate) | |
fc957275 ML |
622 | { |
623 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
624 | struct neigh_node *router = NULL; | |
625 | struct orig_node *orig_node_tmp; | |
626 | struct hlist_node *node; | |
627 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; | |
1eda58bf | 628 | uint8_t *neigh_addr; |
fc957275 | 629 | |
1eda58bf SE |
630 | batadv_dbg(DBG_BATMAN, bat_priv, |
631 | "update_originator(): Searching and updating originator entry of received packet\n"); | |
fc957275 ML |
632 | |
633 | rcu_read_lock(); | |
634 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
635 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
636 | neigh_addr = tmp_neigh_node->addr; |
637 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
638 | tmp_neigh_node->if_incoming == if_incoming && | |
639 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 640 | if (neigh_node) |
7d211efc | 641 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
642 | neigh_node = tmp_neigh_node; |
643 | continue; | |
644 | } | |
645 | ||
646 | if (is_duplicate) | |
647 | continue; | |
648 | ||
e3b0d0de | 649 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
650 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
651 | &tmp_neigh_node->tq_index, 0); | |
fc957275 | 652 | tmp_neigh_node->tq_avg = |
925a6672 | 653 | batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
e3b0d0de | 654 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
655 | } |
656 | ||
657 | if (!neigh_node) { | |
658 | struct orig_node *orig_tmp; | |
659 | ||
7d211efc | 660 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
661 | if (!orig_tmp) |
662 | goto unlock; | |
663 | ||
7ae8b285 ML |
664 | neigh_node = bat_iv_ogm_neigh_new(if_incoming, ethhdr->h_source, |
665 | orig_node, orig_tmp, | |
666 | batman_ogm_packet->seqno); | |
fc957275 | 667 | |
7d211efc | 668 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
669 | if (!neigh_node) |
670 | goto unlock; | |
671 | } else | |
1eda58bf SE |
672 | batadv_dbg(DBG_BATMAN, bat_priv, |
673 | "Updating existing last-hop neighbor of originator\n"); | |
fc957275 ML |
674 | |
675 | rcu_read_unlock(); | |
676 | ||
677 | orig_node->flags = batman_ogm_packet->flags; | |
d7b2a97e | 678 | neigh_node->last_seen = jiffies; |
fc957275 | 679 | |
e3b0d0de | 680 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
681 | batadv_ring_buffer_set(neigh_node->tq_recv, |
682 | &neigh_node->tq_index, | |
683 | batman_ogm_packet->tq); | |
684 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); | |
e3b0d0de | 685 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
686 | |
687 | if (!is_duplicate) { | |
76543d14 SE |
688 | orig_node->last_ttl = batman_ogm_packet->header.ttl; |
689 | neigh_node->last_ttl = batman_ogm_packet->header.ttl; | |
fc957275 ML |
690 | } |
691 | ||
30d3c511 | 692 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
693 | |
694 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
695 | * to change |
696 | */ | |
7d211efc | 697 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
698 | if (router == neigh_node) |
699 | goto update_tt; | |
700 | ||
701 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
702 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
703 | goto update_tt; | |
704 | ||
705 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
706 | * won't consider it either |
707 | */ | |
fc957275 ML |
708 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
709 | orig_node_tmp = router->orig_node; | |
710 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
711 | bcast_own_sum_orig = | |
712 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
713 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
714 | ||
715 | orig_node_tmp = neigh_node->orig_node; | |
716 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
717 | bcast_own_sum_neigh = | |
718 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
719 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
720 | ||
721 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
722 | goto update_tt; | |
723 | } | |
724 | ||
30d3c511 | 725 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
726 | |
727 | update_tt: | |
728 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
729 | * sent through a primary interface |
730 | */ | |
fc957275 | 731 | if (((batman_ogm_packet->orig != ethhdr->h_source) && |
76543d14 | 732 | (batman_ogm_packet->header.ttl > 2)) || |
fc957275 | 733 | (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
08c36d3e SE |
734 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
735 | batman_ogm_packet->tt_num_changes, | |
736 | batman_ogm_packet->ttvn, | |
737 | ntohs(batman_ogm_packet->tt_crc)); | |
fc957275 ML |
738 | |
739 | if (orig_node->gw_flags != batman_ogm_packet->gw_flags) | |
7cf06bc6 SE |
740 | batadv_gw_node_update(bat_priv, orig_node, |
741 | batman_ogm_packet->gw_flags); | |
fc957275 ML |
742 | |
743 | orig_node->gw_flags = batman_ogm_packet->gw_flags; | |
744 | ||
745 | /* restart gateway selection if fast or late switching was enabled */ | |
746 | if ((orig_node->gw_flags) && | |
747 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
748 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
7cf06bc6 | 749 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
750 | |
751 | goto out; | |
752 | ||
753 | unlock: | |
754 | rcu_read_unlock(); | |
755 | out: | |
756 | if (neigh_node) | |
7d211efc | 757 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 758 | if (router) |
7d211efc | 759 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
760 | } |
761 | ||
01c4224b ML |
762 | static int bat_iv_ogm_calc_tq(struct orig_node *orig_node, |
763 | struct orig_node *orig_neigh_node, | |
764 | struct batman_ogm_packet *batman_ogm_packet, | |
765 | struct hard_iface *if_incoming) | |
fc957275 ML |
766 | { |
767 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
768 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
769 | struct hlist_node *node; | |
770 | uint8_t total_count; | |
771 | uint8_t orig_eq_count, neigh_rq_count, tq_own; | |
772 | int tq_asym_penalty, ret = 0; | |
773 | ||
774 | /* find corresponding one hop neighbor */ | |
775 | rcu_read_lock(); | |
776 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
777 | &orig_neigh_node->neigh_list, list) { | |
778 | ||
1eda58bf SE |
779 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
780 | orig_neigh_node->orig)) | |
fc957275 ML |
781 | continue; |
782 | ||
783 | if (tmp_neigh_node->if_incoming != if_incoming) | |
784 | continue; | |
785 | ||
786 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
787 | continue; | |
788 | ||
789 | neigh_node = tmp_neigh_node; | |
790 | break; | |
791 | } | |
792 | rcu_read_unlock(); | |
793 | ||
794 | if (!neigh_node) | |
7ae8b285 ML |
795 | neigh_node = bat_iv_ogm_neigh_new(if_incoming, |
796 | orig_neigh_node->orig, | |
797 | orig_neigh_node, | |
798 | orig_neigh_node, | |
799 | batman_ogm_packet->seqno); | |
fc957275 ML |
800 | |
801 | if (!neigh_node) | |
802 | goto out; | |
803 | ||
d7b2a97e | 804 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 805 | if (orig_node == orig_neigh_node) |
d7b2a97e | 806 | neigh_node->last_seen = jiffies; |
fc957275 | 807 | |
d7b2a97e | 808 | orig_node->last_seen = jiffies; |
fc957275 ML |
809 | |
810 | /* find packet count of corresponding one hop neighbor */ | |
811 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
812 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
813 | neigh_rq_count = neigh_node->real_packet_count; | |
814 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
815 | ||
816 | /* pay attention to not get a value bigger than 100 % */ | |
817 | total_count = (orig_eq_count > neigh_rq_count ? | |
818 | neigh_rq_count : orig_eq_count); | |
819 | ||
9cfc7bd6 SE |
820 | /* if we have too few packets (too less data) we set tq_own to zero |
821 | * if we receive too few packets it is not considered bidirectional | |
822 | */ | |
fc957275 ML |
823 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || |
824 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) | |
825 | tq_own = 0; | |
826 | else | |
827 | /* neigh_node->real_packet_count is never zero as we | |
828 | * only purge old information when getting new | |
9cfc7bd6 SE |
829 | * information |
830 | */ | |
fc957275 ML |
831 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
832 | ||
21a1236b | 833 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
834 | * affect the nearly-symmetric links only a little, but |
835 | * punishes asymmetric links more. This will give a value | |
836 | * between 0 and TQ_MAX_VALUE | |
837 | */ | |
838 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * | |
839 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
840 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
841 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
842 | (TQ_LOCAL_WINDOW_SIZE * | |
843 | TQ_LOCAL_WINDOW_SIZE * | |
844 | TQ_LOCAL_WINDOW_SIZE); | |
845 | ||
846 | batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own | |
847 | * tq_asym_penalty) / | |
848 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
849 | ||
1eda58bf SE |
850 | batadv_dbg(DBG_BATMAN, bat_priv, |
851 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", | |
852 | orig_node->orig, orig_neigh_node->orig, total_count, | |
853 | neigh_rq_count, tq_own, | |
854 | tq_asym_penalty, batman_ogm_packet->tq); | |
fc957275 ML |
855 | |
856 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
857 | * consider it bidirectional |
858 | */ | |
fc957275 ML |
859 | if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) |
860 | ret = 1; | |
861 | ||
862 | out: | |
863 | if (neigh_node) | |
7d211efc | 864 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
865 | return ret; |
866 | } | |
867 | ||
868 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
869 | * finds out whether it is a duplicate. | |
870 | * returns: | |
871 | * 1 the packet is a duplicate | |
872 | * 0 the packet has not yet been received | |
873 | * -1 the packet is old and has been received while the seqno window | |
874 | * was protected. Caller should drop it. | |
875 | */ | |
01c4224b ML |
876 | static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
877 | const struct batman_ogm_packet | |
fc957275 | 878 | *batman_ogm_packet, |
01c4224b | 879 | const struct hard_iface *if_incoming) |
fc957275 ML |
880 | { |
881 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
882 | struct orig_node *orig_node; | |
883 | struct neigh_node *tmp_neigh_node; | |
884 | struct hlist_node *node; | |
885 | int is_duplicate = 0; | |
886 | int32_t seq_diff; | |
887 | int need_update = 0; | |
888 | int set_mark, ret = -1; | |
e0f5211f | 889 | uint32_t seqno = ntohl(batman_ogm_packet->seqno); |
1eda58bf | 890 | uint8_t *neigh_addr; |
fc957275 | 891 | |
7d211efc | 892 | orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig); |
fc957275 ML |
893 | if (!orig_node) |
894 | return 0; | |
895 | ||
896 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 897 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
898 | |
899 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 900 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
901 | batadv_window_protected(bat_priv, seq_diff, |
902 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
903 | goto out; |
904 | ||
905 | rcu_read_lock(); | |
906 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
907 | &orig_node->neigh_list, list) { | |
908 | ||
9b4a1159 SE |
909 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
910 | orig_node->last_real_seqno, | |
911 | seqno); | |
fc957275 | 912 | |
1eda58bf SE |
913 | neigh_addr = tmp_neigh_node->addr; |
914 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
915 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
916 | set_mark = 1; |
917 | else | |
918 | set_mark = 0; | |
919 | ||
920 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
921 | need_update |= batadv_bit_get_packet(bat_priv, |
922 | tmp_neigh_node->real_bits, | |
923 | seq_diff, set_mark); | |
fc957275 ML |
924 | |
925 | tmp_neigh_node->real_packet_count = | |
0079d2ce SE |
926 | bitmap_weight(tmp_neigh_node->real_bits, |
927 | TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
928 | } |
929 | rcu_read_unlock(); | |
930 | ||
931 | if (need_update) { | |
1eda58bf SE |
932 | batadv_dbg(DBG_BATMAN, bat_priv, |
933 | "updating last_seqno: old %u, new %u\n", | |
934 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 935 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
936 | } |
937 | ||
938 | ret = is_duplicate; | |
939 | ||
940 | out: | |
941 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 942 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
943 | return ret; |
944 | } | |
945 | ||
01c4224b ML |
946 | static void bat_iv_ogm_process(const struct ethhdr *ethhdr, |
947 | struct batman_ogm_packet *batman_ogm_packet, | |
948 | const unsigned char *tt_buff, | |
949 | struct hard_iface *if_incoming) | |
fc957275 ML |
950 | { |
951 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
952 | struct hard_iface *hard_iface; | |
953 | struct orig_node *orig_neigh_node, *orig_node; | |
954 | struct neigh_node *router = NULL, *router_router = NULL; | |
955 | struct neigh_node *orig_neigh_router = NULL; | |
956 | int has_directlink_flag; | |
957 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
75cd33f8 ML |
958 | int is_broadcast = 0, is_bidirectional; |
959 | bool is_single_hop_neigh = false; | |
13b2541b | 960 | bool is_from_best_next_hop = false; |
fc957275 ML |
961 | int is_duplicate; |
962 | uint32_t if_incoming_seqno; | |
1eda58bf | 963 | uint8_t *prev_sender; |
fc957275 ML |
964 | |
965 | /* Silently drop when the batman packet is actually not a | |
966 | * correct packet. | |
967 | * | |
968 | * This might happen if a packet is padded (e.g. Ethernet has a | |
969 | * minimum frame length of 64 byte) and the aggregation interprets | |
970 | * it as an additional length. | |
971 | * | |
972 | * TODO: A more sane solution would be to have a bit in the | |
973 | * batman_ogm_packet to detect whether the packet is the last | |
974 | * packet in an aggregation. Here we expect that the padding | |
975 | * is always zero (or not 0x01) | |
976 | */ | |
1eeb479f | 977 | if (batman_ogm_packet->header.packet_type != BAT_IV_OGM) |
fc957275 ML |
978 | return; |
979 | ||
980 | /* could be changed by schedule_own_packet() */ | |
981 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
982 | ||
983 | has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0); | |
984 | ||
1eda58bf | 985 | if (batadv_compare_eth(ethhdr->h_source, batman_ogm_packet->orig)) |
75cd33f8 | 986 | is_single_hop_neigh = true; |
fc957275 | 987 | |
1eda58bf SE |
988 | batadv_dbg(DBG_BATMAN, bat_priv, |
989 | "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", | |
990 | ethhdr->h_source, if_incoming->net_dev->name, | |
991 | if_incoming->net_dev->dev_addr, batman_ogm_packet->orig, | |
992 | batman_ogm_packet->prev_sender, | |
993 | ntohl(batman_ogm_packet->seqno), batman_ogm_packet->ttvn, | |
994 | ntohs(batman_ogm_packet->tt_crc), | |
995 | batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq, | |
996 | batman_ogm_packet->header.ttl, | |
997 | batman_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
998 | |
999 | rcu_read_lock(); | |
3193e8fd | 1000 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
fc957275 ML |
1001 | if (hard_iface->if_status != IF_ACTIVE) |
1002 | continue; | |
1003 | ||
1004 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1005 | continue; | |
1006 | ||
1eda58bf SE |
1007 | if (batadv_compare_eth(ethhdr->h_source, |
1008 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1009 | is_my_addr = 1; |
1010 | ||
1eda58bf SE |
1011 | if (batadv_compare_eth(batman_ogm_packet->orig, |
1012 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1013 | is_my_orig = 1; |
1014 | ||
1eda58bf SE |
1015 | if (batadv_compare_eth(batman_ogm_packet->prev_sender, |
1016 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1017 | is_my_oldorig = 1; |
1018 | ||
1019 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1020 | is_broadcast = 1; | |
1021 | } | |
1022 | rcu_read_unlock(); | |
1023 | ||
76543d14 | 1024 | if (batman_ogm_packet->header.version != COMPAT_VERSION) { |
1eda58bf SE |
1025 | batadv_dbg(DBG_BATMAN, bat_priv, |
1026 | "Drop packet: incompatible batman version (%i)\n", | |
1027 | batman_ogm_packet->header.version); | |
fc957275 ML |
1028 | return; |
1029 | } | |
1030 | ||
1031 | if (is_my_addr) { | |
1eda58bf SE |
1032 | batadv_dbg(DBG_BATMAN, bat_priv, |
1033 | "Drop packet: received my own broadcast (sender: %pM)\n", | |
1034 | ethhdr->h_source); | |
fc957275 ML |
1035 | return; |
1036 | } | |
1037 | ||
1038 | if (is_broadcast) { | |
1eda58bf SE |
1039 | batadv_dbg(DBG_BATMAN, bat_priv, |
1040 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", | |
1041 | ethhdr->h_source); | |
fc957275 ML |
1042 | return; |
1043 | } | |
1044 | ||
1045 | if (is_my_orig) { | |
1046 | unsigned long *word; | |
1047 | int offset; | |
9b4a1159 | 1048 | int32_t bit_pos; |
fc957275 | 1049 | |
7d211efc SE |
1050 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1051 | ethhdr->h_source); | |
fc957275 ML |
1052 | if (!orig_neigh_node) |
1053 | return; | |
1054 | ||
1055 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1056 | * come via the corresponding interface |
1057 | * save packet seqno for bidirectional check | |
1058 | */ | |
fc957275 | 1059 | if (has_directlink_flag && |
1eda58bf SE |
1060 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
1061 | batman_ogm_packet->orig)) { | |
fc957275 ML |
1062 | offset = if_incoming->if_num * NUM_WORDS; |
1063 | ||
1064 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1065 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 SE |
1066 | bit_pos = if_incoming_seqno - 2; |
1067 | bit_pos -= ntohl(batman_ogm_packet->seqno); | |
1068 | batadv_set_bit(word, bit_pos); | |
fc957275 | 1069 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = |
0079d2ce | 1070 | bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE); |
fc957275 ML |
1071 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1072 | } | |
1073 | ||
1eda58bf SE |
1074 | batadv_dbg(DBG_BATMAN, bat_priv, |
1075 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
7d211efc | 1076 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1077 | return; |
1078 | } | |
1079 | ||
1080 | if (is_my_oldorig) { | |
1eda58bf SE |
1081 | batadv_dbg(DBG_BATMAN, bat_priv, |
1082 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", | |
1083 | ethhdr->h_source); | |
fc957275 ML |
1084 | return; |
1085 | } | |
1086 | ||
13b2541b | 1087 | if (batman_ogm_packet->flags & NOT_BEST_NEXT_HOP) { |
1eda58bf SE |
1088 | batadv_dbg(DBG_BATMAN, bat_priv, |
1089 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", | |
1090 | ethhdr->h_source); | |
13b2541b ML |
1091 | return; |
1092 | } | |
1093 | ||
7d211efc | 1094 | orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig); |
fc957275 ML |
1095 | if (!orig_node) |
1096 | return; | |
1097 | ||
01c4224b ML |
1098 | is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet, |
1099 | if_incoming); | |
fc957275 ML |
1100 | |
1101 | if (is_duplicate == -1) { | |
1eda58bf SE |
1102 | batadv_dbg(DBG_BATMAN, bat_priv, |
1103 | "Drop packet: packet within seqno protection time (sender: %pM)\n", | |
1104 | ethhdr->h_source); | |
fc957275 ML |
1105 | goto out; |
1106 | } | |
1107 | ||
1108 | if (batman_ogm_packet->tq == 0) { | |
1eda58bf SE |
1109 | batadv_dbg(DBG_BATMAN, bat_priv, |
1110 | "Drop packet: originator packet with tq equal 0\n"); | |
fc957275 ML |
1111 | goto out; |
1112 | } | |
1113 | ||
7d211efc | 1114 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1115 | if (router) |
7d211efc | 1116 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1117 | |
13b2541b | 1118 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1119 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1120 | is_from_best_next_hop = true; |
1121 | ||
1eda58bf | 1122 | prev_sender = batman_ogm_packet->prev_sender; |
fc957275 ML |
1123 | /* avoid temporary routing loops */ |
1124 | if (router && router_router && | |
1eda58bf SE |
1125 | (batadv_compare_eth(router->addr, prev_sender)) && |
1126 | !(batadv_compare_eth(batman_ogm_packet->orig, prev_sender)) && | |
1127 | (batadv_compare_eth(router->addr, router_router->addr))) { | |
1128 | batadv_dbg(DBG_BATMAN, bat_priv, | |
1129 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", | |
1130 | ethhdr->h_source); | |
fc957275 ML |
1131 | goto out; |
1132 | } | |
1133 | ||
1134 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1135 | * originator mac |
1136 | */ | |
fc957275 ML |
1137 | orig_neigh_node = (is_single_hop_neigh ? |
1138 | orig_node : | |
7d211efc | 1139 | batadv_get_orig_node(bat_priv, ethhdr->h_source)); |
fc957275 ML |
1140 | if (!orig_neigh_node) |
1141 | goto out; | |
1142 | ||
7d211efc | 1143 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1144 | |
1145 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1146 | * don't route towards it |
1147 | */ | |
fc957275 | 1148 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
1eda58bf SE |
1149 | batadv_dbg(DBG_BATMAN, bat_priv, |
1150 | "Drop packet: OGM via unknown neighbor!\n"); | |
fc957275 ML |
1151 | goto out_neigh; |
1152 | } | |
1153 | ||
01c4224b ML |
1154 | is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
1155 | batman_ogm_packet, if_incoming); | |
fc957275 | 1156 | |
30d3c511 SE |
1157 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
1158 | batman_ogm_packet); | |
fc957275 ML |
1159 | |
1160 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1161 | * seqno and similar ttl as the non-duplicate |
1162 | */ | |
fc957275 ML |
1163 | if (is_bidirectional && |
1164 | (!is_duplicate || | |
e0f5211f | 1165 | ((orig_node->last_real_seqno == ntohl(batman_ogm_packet->seqno)) && |
76543d14 | 1166 | (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl)))) |
01c4224b ML |
1167 | bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, |
1168 | batman_ogm_packet, if_incoming, | |
1169 | tt_buff, is_duplicate); | |
fc957275 ML |
1170 | |
1171 | /* is single hop (direct) neighbor */ | |
1172 | if (is_single_hop_neigh) { | |
1173 | ||
1174 | /* mark direct link on incoming interface */ | |
01c4224b | 1175 | bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
13b2541b ML |
1176 | is_single_hop_neigh, is_from_best_next_hop, |
1177 | if_incoming); | |
fc957275 | 1178 | |
1eda58bf SE |
1179 | batadv_dbg(DBG_BATMAN, bat_priv, |
1180 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); | |
fc957275 ML |
1181 | goto out_neigh; |
1182 | } | |
1183 | ||
1184 | /* multihop originator */ | |
1185 | if (!is_bidirectional) { | |
1eda58bf SE |
1186 | batadv_dbg(DBG_BATMAN, bat_priv, |
1187 | "Drop packet: not received via bidirectional link\n"); | |
fc957275 ML |
1188 | goto out_neigh; |
1189 | } | |
1190 | ||
1191 | if (is_duplicate) { | |
1eda58bf SE |
1192 | batadv_dbg(DBG_BATMAN, bat_priv, |
1193 | "Drop packet: duplicate packet received\n"); | |
fc957275 ML |
1194 | goto out_neigh; |
1195 | } | |
1196 | ||
1eda58bf SE |
1197 | batadv_dbg(DBG_BATMAN, bat_priv, |
1198 | "Forwarding packet: rebroadcast originator packet\n"); | |
01c4224b | 1199 | bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet, |
13b2541b ML |
1200 | is_single_hop_neigh, is_from_best_next_hop, |
1201 | if_incoming); | |
fc957275 ML |
1202 | |
1203 | out_neigh: | |
1204 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1205 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1206 | out: |
1207 | if (router) | |
7d211efc | 1208 | batadv_neigh_node_free_ref(router); |
fc957275 | 1209 | if (router_router) |
7d211efc | 1210 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1211 | if (orig_neigh_router) |
7d211efc | 1212 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1213 | |
7d211efc | 1214 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1215 | } |
1216 | ||
c3e29312 ML |
1217 | static int bat_iv_ogm_receive(struct sk_buff *skb, |
1218 | struct hard_iface *if_incoming) | |
fc957275 | 1219 | { |
edbf12ba | 1220 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
fc957275 | 1221 | struct batman_ogm_packet *batman_ogm_packet; |
8780dad9 ML |
1222 | struct ethhdr *ethhdr; |
1223 | int buff_pos = 0, packet_len; | |
1224 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 ML |
1225 | bool ret; |
1226 | ||
30d3c511 | 1227 | ret = batadv_check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN); |
c3e29312 ML |
1228 | if (!ret) |
1229 | return NET_RX_DROP; | |
fc957275 | 1230 | |
edbf12ba ML |
1231 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1232 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1233 | */ | |
1234 | if (bat_priv->bat_algo_ops->bat_ogm_emit != bat_iv_ogm_emit) | |
1235 | return NET_RX_DROP; | |
1236 | ||
f8214865 MH |
1237 | batadv_inc_counter(bat_priv, BAT_CNT_MGMT_RX); |
1238 | batadv_add_counter(bat_priv, BAT_CNT_MGMT_RX_BYTES, | |
1239 | skb->len + ETH_HLEN); | |
1240 | ||
8780dad9 ML |
1241 | packet_len = skb_headlen(skb); |
1242 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1243 | packet_buff = skb->data; | |
fc957275 ML |
1244 | batman_ogm_packet = (struct batman_ogm_packet *)packet_buff; |
1245 | ||
1246 | /* unpack the aggregated packets and process them one by one */ | |
1247 | do { | |
76e3d7fc | 1248 | tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN; |
fc957275 | 1249 | |
01c4224b ML |
1250 | bat_iv_ogm_process(ethhdr, batman_ogm_packet, |
1251 | tt_buff, if_incoming); | |
fc957275 | 1252 | |
08c36d3e SE |
1253 | buff_pos += BATMAN_OGM_HLEN; |
1254 | buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes); | |
fc957275 ML |
1255 | |
1256 | batman_ogm_packet = (struct batman_ogm_packet *) | |
1257 | (packet_buff + buff_pos); | |
01c4224b ML |
1258 | } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len, |
1259 | batman_ogm_packet->tt_num_changes)); | |
c3e29312 ML |
1260 | |
1261 | kfree_skb(skb); | |
1262 | return NET_RX_SUCCESS; | |
fc957275 | 1263 | } |
1c280471 ML |
1264 | |
1265 | static struct bat_algo_ops batman_iv __read_mostly = { | |
519d3497 | 1266 | .name = "BATMAN_IV", |
c2aca022 | 1267 | .bat_iface_enable = bat_iv_ogm_iface_enable, |
00a50076 | 1268 | .bat_iface_disable = bat_iv_ogm_iface_disable, |
c3229398 | 1269 | .bat_iface_update_mac = bat_iv_ogm_iface_update_mac, |
cd8b78e7 | 1270 | .bat_primary_iface_set = bat_iv_ogm_primary_iface_set, |
01c4224b ML |
1271 | .bat_ogm_schedule = bat_iv_ogm_schedule, |
1272 | .bat_ogm_emit = bat_iv_ogm_emit, | |
1c280471 ML |
1273 | }; |
1274 | ||
81c524f7 | 1275 | int __init batadv_iv_init(void) |
1c280471 | 1276 | { |
c3e29312 ML |
1277 | int ret; |
1278 | ||
1279 | /* batman originator packet */ | |
3193e8fd | 1280 | ret = batadv_recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive); |
c3e29312 ML |
1281 | if (ret < 0) |
1282 | goto out; | |
1283 | ||
3193e8fd | 1284 | ret = batadv_algo_register(&batman_iv); |
c3e29312 ML |
1285 | if (ret < 0) |
1286 | goto handler_unregister; | |
1287 | ||
1288 | goto out; | |
1289 | ||
1290 | handler_unregister: | |
3193e8fd | 1291 | batadv_recv_handler_unregister(BAT_IV_OGM); |
c3e29312 ML |
1292 | out: |
1293 | return ret; | |
1c280471 | 1294 | } |