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 | |
56303d34 SE |
31 | static struct batadv_neigh_node * |
32 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
33 | const uint8_t *neigh_addr, | |
34 | struct batadv_orig_node *orig_node, | |
35 | struct batadv_orig_node *orig_neigh, __be32 seqno) | |
7ae8b285 | 36 | { |
56303d34 | 37 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 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 | ||
56303d34 | 57 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 58 | { |
96412690 | 59 | struct batadv_ogm_packet *batadv_ogm_packet; |
d7d32ec0 | 60 | uint32_t random_seqno; |
5346c35e | 61 | int res = -ENOMEM; |
d7d32ec0 ML |
62 | |
63 | /* randomize initial seqno to avoid collision */ | |
64 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
65 | atomic_set(&hard_iface->seqno, random_seqno); | |
d0b9fd89 | 66 | |
7e071c79 | 67 | hard_iface->packet_len = BATADV_OGM_HLEN; |
d0b9fd89 ML |
68 | hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC); |
69 | ||
77af7575 ML |
70 | if (!hard_iface->packet_buff) |
71 | goto out; | |
72 | ||
96412690 SE |
73 | batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff; |
74 | batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; | |
75 | batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; | |
76 | batadv_ogm_packet->header.ttl = 2; | |
77 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; | |
78 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
79 | batadv_ogm_packet->tt_num_changes = 0; | |
80 | batadv_ogm_packet->ttvn = 0; | |
77af7575 ML |
81 | |
82 | res = 0; | |
83 | ||
84 | out: | |
85 | return res; | |
d0b9fd89 ML |
86 | } |
87 | ||
56303d34 | 88 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 ML |
89 | { |
90 | kfree(hard_iface->packet_buff); | |
91 | hard_iface->packet_buff = NULL; | |
92 | } | |
93 | ||
56303d34 | 94 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 95 | { |
96412690 | 96 | struct batadv_ogm_packet *batadv_ogm_packet; |
d0b9fd89 | 97 | |
96412690 SE |
98 | batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff; |
99 | memcpy(batadv_ogm_packet->orig, | |
c3229398 | 100 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 101 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 102 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
103 | } |
104 | ||
56303d34 SE |
105 | static void |
106 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 107 | { |
96412690 | 108 | struct batadv_ogm_packet *batadv_ogm_packet; |
d0b9fd89 | 109 | |
96412690 SE |
110 | batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff; |
111 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; | |
112 | batadv_ogm_packet->header.ttl = BATADV_TTL; | |
d0b9fd89 ML |
113 | } |
114 | ||
b9dacc52 | 115 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 116 | static unsigned long |
56303d34 | 117 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 118 | { |
42d0b044 SE |
119 | unsigned int msecs; |
120 | ||
121 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
122 | msecs += (random32() % 2 * BATADV_JITTER); | |
123 | ||
124 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
125 | } |
126 | ||
127 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 128 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 129 | { |
42d0b044 | 130 | return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
131 | } |
132 | ||
133 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
134 | static uint8_t batadv_hop_penalty(uint8_t tq, |
135 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
136 | { |
137 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
138 | int new_tq; |
139 | ||
140 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
141 | new_tq /= BATADV_TQ_MAX_VALUE; | |
142 | ||
143 | return new_tq; | |
b9dacc52 ML |
144 | } |
145 | ||
fc957275 | 146 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
147 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
148 | int tt_num_changes) | |
fc957275 | 149 | { |
08c36d3e SE |
150 | int next_buff_pos = 0; |
151 | ||
7e071c79 | 152 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 153 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
154 | |
155 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 156 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
157 | } |
158 | ||
b9dacc52 | 159 | /* send a batman ogm to a given interface */ |
56303d34 SE |
160 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
161 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 162 | { |
56303d34 | 163 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
164 | char *fwd_str; |
165 | uint8_t packet_num; | |
166 | int16_t buff_pos; | |
96412690 | 167 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 ML |
168 | struct sk_buff *skb; |
169 | ||
e9a4f295 | 170 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
171 | return; |
172 | ||
173 | packet_num = 0; | |
174 | buff_pos = 0; | |
96412690 | 175 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
b9dacc52 ML |
176 | |
177 | /* adjust all flags and log packets */ | |
fe8bc396 | 178 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
96412690 | 179 | batadv_ogm_packet->tt_num_changes)) { |
b9dacc52 ML |
180 | |
181 | /* we might have aggregated direct link packets with an | |
9cfc7bd6 SE |
182 | * ordinary base packet |
183 | */ | |
8de47de5 SE |
184 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
185 | forw_packet->if_incoming == hard_iface) | |
96412690 | 186 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 187 | else |
96412690 | 188 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 ML |
189 | |
190 | fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? | |
191 | "Sending own" : | |
192 | "Forwarding")); | |
39c75a51 | 193 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
194 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
195 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
96412690 SE |
196 | batadv_ogm_packet->orig, |
197 | ntohl(batadv_ogm_packet->seqno), | |
198 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, | |
199 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? | |
1eda58bf | 200 | "on" : "off"), |
96412690 | 201 | batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
1eda58bf | 202 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 203 | |
7e071c79 | 204 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 205 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
b9dacc52 | 206 | packet_num++; |
96412690 | 207 | batadv_ogm_packet = (struct batadv_ogm_packet *) |
b9dacc52 ML |
208 | (forw_packet->skb->data + buff_pos); |
209 | } | |
210 | ||
211 | /* create clone because function is called more than once */ | |
212 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 213 | if (skb) { |
d69909d2 SE |
214 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
215 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 216 | skb->len + ETH_HLEN); |
3193e8fd | 217 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 218 | } |
b9dacc52 ML |
219 | } |
220 | ||
221 | /* send a batman ogm packet */ | |
56303d34 | 222 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 223 | { |
56303d34 | 224 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 225 | struct net_device *soft_iface; |
56303d34 SE |
226 | struct batadv_priv *bat_priv; |
227 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 228 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 ML |
229 | unsigned char directlink; |
230 | ||
96412690 | 231 | batadv_ogm_packet = (struct batadv_ogm_packet *) |
b9dacc52 | 232 | (forw_packet->skb->data); |
96412690 | 233 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
234 | |
235 | if (!forw_packet->if_incoming) { | |
86ceb360 | 236 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
237 | goto out; |
238 | } | |
239 | ||
240 | soft_iface = forw_packet->if_incoming->soft_iface; | |
241 | bat_priv = netdev_priv(soft_iface); | |
242 | ||
e9a4f295 | 243 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
244 | goto out; |
245 | ||
e5d89254 | 246 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
247 | if (!primary_if) |
248 | goto out; | |
249 | ||
9cfc7bd6 SE |
250 | /* multihomed peer assumed |
251 | * non-primary OGMs are only broadcasted on their interface | |
252 | */ | |
96412690 | 253 | if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
b9dacc52 ML |
254 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
255 | ||
256 | /* FIXME: what about aggregated packets ? */ | |
39c75a51 | 257 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
258 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
259 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
260 | batadv_ogm_packet->orig, |
261 | ntohl(batadv_ogm_packet->seqno), | |
262 | batadv_ogm_packet->header.ttl, | |
1eda58bf SE |
263 | forw_packet->if_incoming->net_dev->name, |
264 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
265 | |
266 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
267 | batadv_send_skb_packet(forw_packet->skb, |
268 | forw_packet->if_incoming, | |
3193e8fd | 269 | batadv_broadcast_addr); |
b9dacc52 ML |
270 | forw_packet->skb = NULL; |
271 | ||
272 | goto out; | |
273 | } | |
274 | ||
275 | /* broadcast on every interface */ | |
276 | rcu_read_lock(); | |
3193e8fd | 277 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
278 | if (hard_iface->soft_iface != soft_iface) |
279 | continue; | |
280 | ||
fe8bc396 | 281 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
282 | } |
283 | rcu_read_unlock(); | |
284 | ||
285 | out: | |
286 | if (primary_if) | |
e5d89254 | 287 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
288 | } |
289 | ||
290 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 291 | static bool |
96412690 | 292 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 293 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
294 | int packet_len, unsigned long send_time, |
295 | bool directlink, | |
56303d34 SE |
296 | const struct batadv_hard_iface *if_incoming, |
297 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 298 | { |
96412690 | 299 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 300 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 301 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 302 | bool res = false; |
42d0b044 | 303 | unsigned long aggregation_end_time; |
b9dacc52 | 304 | |
96412690 | 305 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
306 | aggregation_end_time = send_time; |
307 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 308 | |
9cfc7bd6 | 309 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
310 | * if: |
311 | * | |
312 | * - the send time is within our MAX_AGGREGATION_MS time | |
313 | * - the resulting packet wont be bigger than | |
314 | * MAX_AGGREGATION_BYTES | |
315 | */ | |
b9dacc52 | 316 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
317 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
318 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
b9dacc52 | 319 | |
9cfc7bd6 | 320 | /* check aggregation compatibility |
b9dacc52 ML |
321 | * -> direct link packets are broadcasted on |
322 | * their interface only | |
323 | * -> aggregate packet if the current packet is | |
324 | * a "global" packet as well as the base | |
325 | * packet | |
326 | */ | |
e5d89254 | 327 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
328 | if (!primary_if) |
329 | goto out; | |
330 | ||
331 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
332 | * are flooded through the net |
333 | */ | |
b9dacc52 | 334 | if ((!directlink) && |
96412690 SE |
335 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
336 | (batadv_ogm_packet->header.ttl != 1) && | |
b9dacc52 ML |
337 | |
338 | /* own packets originating non-primary | |
9cfc7bd6 SE |
339 | * interfaces leave only that interface |
340 | */ | |
b9dacc52 ML |
341 | ((!forw_packet->own) || |
342 | (forw_packet->if_incoming == primary_if))) { | |
343 | res = true; | |
344 | goto out; | |
345 | } | |
346 | ||
347 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
348 | * interface only - we still can aggregate |
349 | */ | |
b9dacc52 | 350 | if ((directlink) && |
fe8bc396 | 351 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
352 | (forw_packet->if_incoming == if_incoming) && |
353 | ||
354 | /* packets from direct neighbors or | |
355 | * own secondary interface packets | |
9cfc7bd6 SE |
356 | * (= secondary interface packets in general) |
357 | */ | |
96412690 | 358 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
359 | (forw_packet->own && |
360 | forw_packet->if_incoming != primary_if))) { | |
361 | res = true; | |
362 | goto out; | |
363 | } | |
364 | } | |
365 | ||
366 | out: | |
367 | if (primary_if) | |
e5d89254 | 368 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
369 | return res; |
370 | } | |
371 | ||
372 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
373 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
374 | int packet_len, unsigned long send_time, | |
375 | bool direct_link, | |
56303d34 | 376 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 377 | int own_packet) |
b9dacc52 | 378 | { |
56303d34 SE |
379 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
380 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 381 | unsigned char *skb_buff; |
42d0b044 | 382 | unsigned int skb_size; |
b9dacc52 ML |
383 | |
384 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
385 | return; | |
386 | ||
387 | /* own packet should always be scheduled */ | |
388 | if (!own_packet) { | |
3e34819e | 389 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 390 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 391 | "batman packet queue full\n"); |
b9dacc52 ML |
392 | goto out; |
393 | } | |
394 | } | |
395 | ||
396 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
397 | if (!forw_packet_aggr) { | |
398 | if (!own_packet) | |
399 | atomic_inc(&bat_priv->batman_queue_left); | |
400 | goto out; | |
401 | } | |
402 | ||
403 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 SE |
404 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
405 | skb_size = BATADV_MAX_AGGREGATION_BYTES + ETH_HLEN; | |
b9dacc52 | 406 | else |
42d0b044 | 407 | skb_size = packet_len + ETH_HLEN; |
b9dacc52 | 408 | |
42d0b044 | 409 | forw_packet_aggr->skb = dev_alloc_skb(skb_size); |
b9dacc52 ML |
410 | if (!forw_packet_aggr->skb) { |
411 | if (!own_packet) | |
412 | atomic_inc(&bat_priv->batman_queue_left); | |
413 | kfree(forw_packet_aggr); | |
414 | goto out; | |
415 | } | |
0d125074 | 416 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 ML |
417 | |
418 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
419 | ||
420 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
421 | forw_packet_aggr->packet_len = packet_len; | |
422 | memcpy(skb_buff, packet_buff, packet_len); | |
423 | ||
424 | forw_packet_aggr->own = own_packet; | |
425 | forw_packet_aggr->if_incoming = if_incoming; | |
426 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 427 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
428 | forw_packet_aggr->send_time = send_time; |
429 | ||
430 | /* save packet direct link flag status */ | |
431 | if (direct_link) | |
432 | forw_packet_aggr->direct_link_flags |= 1; | |
433 | ||
434 | /* add new packet to packet list */ | |
435 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
436 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
437 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
438 | ||
439 | /* start timer for this packet */ | |
440 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 441 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 442 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
443 | &forw_packet_aggr->delayed_work, |
444 | send_time - jiffies); | |
445 | ||
446 | return; | |
447 | out: | |
e5d89254 | 448 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
449 | } |
450 | ||
451 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 452 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
453 | const unsigned char *packet_buff, |
454 | int packet_len, bool direct_link) | |
b9dacc52 ML |
455 | { |
456 | unsigned char *skb_buff; | |
8de47de5 | 457 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
458 | |
459 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
460 | memcpy(skb_buff, packet_buff, packet_len); | |
461 | forw_packet_aggr->packet_len += packet_len; | |
462 | forw_packet_aggr->num_packets++; | |
463 | ||
464 | /* save packet direct link flag status */ | |
8de47de5 SE |
465 | if (direct_link) { |
466 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
467 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
468 | } | |
b9dacc52 ML |
469 | } |
470 | ||
56303d34 | 471 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
472 | unsigned char *packet_buff, |
473 | int packet_len, | |
56303d34 | 474 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 475 | int own_packet, unsigned long send_time) |
b9dacc52 | 476 | { |
9cfc7bd6 | 477 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
478 | * _pos -> pointer to the position in the queue |
479 | */ | |
56303d34 SE |
480 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
481 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
b9dacc52 | 482 | struct hlist_node *tmp_node; |
96412690 | 483 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 484 | bool direct_link; |
42d0b044 | 485 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 486 | |
96412690 SE |
487 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
488 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 489 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
490 | |
491 | /* find position for the packet in the forward queue */ | |
492 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
493 | /* own packets are not to be aggregated */ | |
494 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
495 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
496 | &bat_priv->forw_bat_list, list) { | |
96412690 | 497 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
498 | bat_priv, packet_len, |
499 | send_time, direct_link, | |
500 | if_incoming, | |
501 | forw_packet_pos)) { | |
b9dacc52 ML |
502 | forw_packet_aggr = forw_packet_pos; |
503 | break; | |
504 | } | |
505 | } | |
506 | } | |
507 | ||
508 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
509 | * suitable aggregation packet found |
510 | */ | |
b9dacc52 ML |
511 | if (!forw_packet_aggr) { |
512 | /* the following section can run without the lock */ | |
513 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
514 | ||
9cfc7bd6 | 515 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
516 | * we hold it back for a while, so that it might be aggregated |
517 | * later on | |
518 | */ | |
42d0b044 SE |
519 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
520 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 521 | |
fe8bc396 SE |
522 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
523 | send_time, direct_link, | |
524 | if_incoming, own_packet); | |
b9dacc52 | 525 | } else { |
fe8bc396 SE |
526 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
527 | packet_len, direct_link); | |
b9dacc52 ML |
528 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
529 | } | |
530 | } | |
531 | ||
56303d34 | 532 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 533 | const struct ethhdr *ethhdr, |
96412690 | 534 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
535 | bool is_single_hop_neigh, |
536 | bool is_from_best_next_hop, | |
56303d34 | 537 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 538 | { |
56303d34 | 539 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
540 | uint8_t tt_num_changes; |
541 | ||
96412690 | 542 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 543 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
544 | return; |
545 | } | |
546 | ||
13b2541b ML |
547 | if (!is_from_best_next_hop) { |
548 | /* Mark the forwarded packet when it is not coming from our | |
549 | * best next hop. We still need to forward the packet for our | |
550 | * neighbor link quality detection to work in case the packet | |
551 | * originated from a single hop neighbor. Otherwise we can | |
552 | * simply drop the ogm. | |
553 | */ | |
554 | if (is_single_hop_neigh) | |
96412690 | 555 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
556 | else |
557 | return; | |
558 | } | |
b9dacc52 | 559 | |
96412690 | 560 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 561 | |
96412690 SE |
562 | batadv_ogm_packet->header.ttl--; |
563 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 564 | |
b9dacc52 | 565 | /* apply hop penalty */ |
96412690 | 566 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 567 | bat_priv); |
b9dacc52 | 568 | |
39c75a51 | 569 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 570 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 571 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 572 | |
b9dacc52 | 573 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 574 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 575 | if (is_single_hop_neigh) |
96412690 | 576 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 577 | else |
96412690 | 578 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 579 | |
96412690 | 580 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 581 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 582 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
583 | } |
584 | ||
56303d34 | 585 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 586 | { |
56303d34 | 587 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
96412690 | 588 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 589 | struct batadv_hard_iface *primary_if; |
be9aa4c1 | 590 | int vis_server, tt_num_changes = 0; |
bbb1f90e SE |
591 | uint32_t seqno; |
592 | uint8_t bandwidth; | |
b9dacc52 ML |
593 | |
594 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 595 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 596 | |
be9aa4c1 ML |
597 | if (hard_iface == primary_if) |
598 | tt_num_changes = batadv_tt_append_diff(bat_priv, | |
599 | &hard_iface->packet_buff, | |
600 | &hard_iface->packet_len, | |
7e071c79 | 601 | BATADV_OGM_HLEN); |
be9aa4c1 | 602 | |
96412690 | 603 | batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff; |
b9dacc52 ML |
604 | |
605 | /* change sequence number to network order */ | |
bbb1f90e SE |
606 | seqno = (uint32_t)atomic_read(&hard_iface->seqno); |
607 | batadv_ogm_packet->seqno = htonl(seqno); | |
be9aa4c1 | 608 | atomic_inc(&hard_iface->seqno); |
b9dacc52 | 609 | |
807736f6 SE |
610 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
611 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); | |
b9dacc52 | 612 | if (tt_num_changes >= 0) |
96412690 | 613 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 614 | |
acd34afa | 615 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 616 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 617 | else |
96412690 | 618 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 | 619 | |
bbb1f90e SE |
620 | if (hard_iface == primary_if && |
621 | atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { | |
622 | bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
623 | batadv_ogm_packet->gw_flags = bandwidth; | |
624 | } else { | |
96412690 | 625 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
bbb1f90e | 626 | } |
b9dacc52 | 627 | |
30d3c511 | 628 | batadv_slide_own_bcast_window(hard_iface); |
fe8bc396 SE |
629 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff, |
630 | hard_iface->packet_len, hard_iface, 1, | |
631 | batadv_iv_ogm_emit_send_time(bat_priv)); | |
b9dacc52 ML |
632 | |
633 | if (primary_if) | |
e5d89254 | 634 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
635 | } |
636 | ||
fe8bc396 | 637 | static void |
56303d34 SE |
638 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
639 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 640 | const struct ethhdr *ethhdr, |
96412690 | 641 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 642 | struct batadv_hard_iface *if_incoming, |
fe8bc396 SE |
643 | const unsigned char *tt_buff, |
644 | int is_duplicate) | |
fc957275 | 645 | { |
56303d34 SE |
646 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
647 | struct batadv_neigh_node *router = NULL; | |
648 | struct batadv_orig_node *orig_node_tmp; | |
fc957275 | 649 | struct hlist_node *node; |
bbb1f90e | 650 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 651 | uint8_t *neigh_addr; |
bbb1f90e | 652 | uint8_t tq_avg; |
fc957275 | 653 | |
39c75a51 | 654 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 655 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
656 | |
657 | rcu_read_lock(); | |
658 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
659 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
660 | neigh_addr = tmp_neigh_node->addr; |
661 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
662 | tmp_neigh_node->if_incoming == if_incoming && | |
663 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 664 | if (neigh_node) |
7d211efc | 665 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
666 | neigh_node = tmp_neigh_node; |
667 | continue; | |
668 | } | |
669 | ||
670 | if (is_duplicate) | |
671 | continue; | |
672 | ||
e3b0d0de | 673 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
674 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
675 | &tmp_neigh_node->tq_index, 0); | |
bbb1f90e SE |
676 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
677 | tmp_neigh_node->tq_avg = tq_avg; | |
e3b0d0de | 678 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
679 | } |
680 | ||
681 | if (!neigh_node) { | |
56303d34 | 682 | struct batadv_orig_node *orig_tmp; |
fc957275 | 683 | |
7d211efc | 684 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
685 | if (!orig_tmp) |
686 | goto unlock; | |
687 | ||
fe8bc396 SE |
688 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
689 | ethhdr->h_source, | |
690 | orig_node, orig_tmp, | |
96412690 | 691 | batadv_ogm_packet->seqno); |
fc957275 | 692 | |
7d211efc | 693 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
694 | if (!neigh_node) |
695 | goto unlock; | |
696 | } else | |
39c75a51 | 697 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 698 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
699 | |
700 | rcu_read_unlock(); | |
701 | ||
96412690 | 702 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 703 | neigh_node->last_seen = jiffies; |
fc957275 | 704 | |
e3b0d0de | 705 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
706 | batadv_ring_buffer_set(neigh_node->tq_recv, |
707 | &neigh_node->tq_index, | |
96412690 | 708 | batadv_ogm_packet->tq); |
925a6672 | 709 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 710 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
711 | |
712 | if (!is_duplicate) { | |
96412690 SE |
713 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
714 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
715 | } |
716 | ||
30d3c511 | 717 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
718 | |
719 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
720 | * to change |
721 | */ | |
7d211efc | 722 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
723 | if (router == neigh_node) |
724 | goto update_tt; | |
725 | ||
726 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
727 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
728 | goto update_tt; | |
729 | ||
730 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
731 | * won't consider it either |
732 | */ | |
fc957275 ML |
733 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
734 | orig_node_tmp = router->orig_node; | |
735 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
bbb1f90e | 736 | sum_orig = orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
fc957275 ML |
737 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
738 | ||
739 | orig_node_tmp = neigh_node->orig_node; | |
740 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
bbb1f90e | 741 | sum_neigh = orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
fc957275 ML |
742 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
743 | ||
bbb1f90e | 744 | if (sum_orig >= sum_neigh) |
fc957275 ML |
745 | goto update_tt; |
746 | } | |
747 | ||
30d3c511 | 748 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
749 | |
750 | update_tt: | |
751 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
752 | * sent through a primary interface |
753 | */ | |
96412690 SE |
754 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
755 | (batadv_ogm_packet->header.ttl > 2)) || | |
756 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 757 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
758 | batadv_ogm_packet->tt_num_changes, |
759 | batadv_ogm_packet->ttvn, | |
760 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 761 | |
96412690 | 762 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 763 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 764 | batadv_ogm_packet->gw_flags); |
fc957275 | 765 | |
96412690 | 766 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
767 | |
768 | /* restart gateway selection if fast or late switching was enabled */ | |
769 | if ((orig_node->gw_flags) && | |
cd646ab1 | 770 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 771 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 772 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
773 | |
774 | goto out; | |
775 | ||
776 | unlock: | |
777 | rcu_read_unlock(); | |
778 | out: | |
779 | if (neigh_node) | |
7d211efc | 780 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 781 | if (router) |
7d211efc | 782 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
783 | } |
784 | ||
56303d34 SE |
785 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
786 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 787 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 788 | struct batadv_hard_iface *if_incoming) |
fc957275 | 789 | { |
56303d34 SE |
790 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
791 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 ML |
792 | struct hlist_node *node; |
793 | uint8_t total_count; | |
42d0b044 SE |
794 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
795 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
796 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
797 | unsigned int combined_tq; | |
fc957275 ML |
798 | |
799 | /* find corresponding one hop neighbor */ | |
800 | rcu_read_lock(); | |
801 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
802 | &orig_neigh_node->neigh_list, list) { | |
803 | ||
1eda58bf SE |
804 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
805 | orig_neigh_node->orig)) | |
fc957275 ML |
806 | continue; |
807 | ||
808 | if (tmp_neigh_node->if_incoming != if_incoming) | |
809 | continue; | |
810 | ||
811 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
812 | continue; | |
813 | ||
814 | neigh_node = tmp_neigh_node; | |
815 | break; | |
816 | } | |
817 | rcu_read_unlock(); | |
818 | ||
819 | if (!neigh_node) | |
fe8bc396 SE |
820 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
821 | orig_neigh_node->orig, | |
822 | orig_neigh_node, | |
823 | orig_neigh_node, | |
96412690 | 824 | batadv_ogm_packet->seqno); |
fc957275 ML |
825 | |
826 | if (!neigh_node) | |
827 | goto out; | |
828 | ||
d7b2a97e | 829 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 830 | if (orig_node == orig_neigh_node) |
d7b2a97e | 831 | neigh_node->last_seen = jiffies; |
fc957275 | 832 | |
d7b2a97e | 833 | orig_node->last_seen = jiffies; |
fc957275 ML |
834 | |
835 | /* find packet count of corresponding one hop neighbor */ | |
836 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
837 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
838 | neigh_rq_count = neigh_node->real_packet_count; | |
839 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
840 | ||
841 | /* pay attention to not get a value bigger than 100 % */ | |
842 | total_count = (orig_eq_count > neigh_rq_count ? | |
843 | neigh_rq_count : orig_eq_count); | |
844 | ||
9cfc7bd6 SE |
845 | /* if we have too few packets (too less data) we set tq_own to zero |
846 | * if we receive too few packets it is not considered bidirectional | |
847 | */ | |
42d0b044 SE |
848 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
849 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
850 | tq_own = 0; |
851 | else | |
852 | /* neigh_node->real_packet_count is never zero as we | |
853 | * only purge old information when getting new | |
9cfc7bd6 SE |
854 | * information |
855 | */ | |
42d0b044 | 856 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 857 | |
21a1236b | 858 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
859 | * affect the nearly-symmetric links only a little, but |
860 | * punishes asymmetric links more. This will give a value | |
861 | * between 0 and TQ_MAX_VALUE | |
862 | */ | |
42d0b044 SE |
863 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
864 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
865 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
866 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
867 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
868 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
869 | inv_asym_penalty /= neigh_rq_max_cube; | |
870 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
871 | ||
96412690 | 872 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 873 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 874 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 875 | |
39c75a51 | 876 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
877 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
878 | orig_node->orig, orig_neigh_node->orig, total_count, | |
879 | neigh_rq_count, tq_own, | |
96412690 | 880 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
881 | |
882 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
883 | * consider it bidirectional |
884 | */ | |
96412690 | 885 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
886 | ret = 1; |
887 | ||
888 | out: | |
889 | if (neigh_node) | |
7d211efc | 890 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
891 | return ret; |
892 | } | |
893 | ||
894 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
895 | * finds out whether it is a duplicate. | |
896 | * returns: | |
897 | * 1 the packet is a duplicate | |
898 | * 0 the packet has not yet been received | |
899 | * -1 the packet is old and has been received while the seqno window | |
900 | * was protected. Caller should drop it. | |
901 | */ | |
fe8bc396 SE |
902 | static int |
903 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
96412690 | 904 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 905 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 906 | { |
56303d34 SE |
907 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
908 | struct batadv_orig_node *orig_node; | |
909 | struct batadv_neigh_node *tmp_neigh_node; | |
fc957275 ML |
910 | struct hlist_node *node; |
911 | int is_duplicate = 0; | |
912 | int32_t seq_diff; | |
913 | int need_update = 0; | |
914 | int set_mark, ret = -1; | |
96412690 | 915 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 916 | uint8_t *neigh_addr; |
bbb1f90e | 917 | uint8_t packet_count; |
fc957275 | 918 | |
96412690 | 919 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
920 | if (!orig_node) |
921 | return 0; | |
922 | ||
923 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 924 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
925 | |
926 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 927 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
928 | batadv_window_protected(bat_priv, seq_diff, |
929 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
930 | goto out; |
931 | ||
932 | rcu_read_lock(); | |
933 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
934 | &orig_node->neigh_list, list) { | |
935 | ||
9b4a1159 SE |
936 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
937 | orig_node->last_real_seqno, | |
938 | seqno); | |
fc957275 | 939 | |
1eda58bf SE |
940 | neigh_addr = tmp_neigh_node->addr; |
941 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
942 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
943 | set_mark = 1; |
944 | else | |
945 | set_mark = 0; | |
946 | ||
947 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
948 | need_update |= batadv_bit_get_packet(bat_priv, |
949 | tmp_neigh_node->real_bits, | |
950 | seq_diff, set_mark); | |
fc957275 | 951 | |
bbb1f90e SE |
952 | packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
953 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
954 | tmp_neigh_node->real_packet_count = packet_count; | |
fc957275 ML |
955 | } |
956 | rcu_read_unlock(); | |
957 | ||
958 | if (need_update) { | |
39c75a51 | 959 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
960 | "updating last_seqno: old %u, new %u\n", |
961 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 962 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
963 | } |
964 | ||
965 | ret = is_duplicate; | |
966 | ||
967 | out: | |
968 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 969 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
970 | return ret; |
971 | } | |
972 | ||
fe8bc396 | 973 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 974 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 975 | const unsigned char *tt_buff, |
56303d34 | 976 | struct batadv_hard_iface *if_incoming) |
fc957275 | 977 | { |
56303d34 SE |
978 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
979 | struct batadv_hard_iface *hard_iface; | |
980 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
981 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
982 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
983 | int has_directlink_flag; |
984 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
fe8bc396 | 985 | int is_broadcast = 0, is_bidirect; |
75cd33f8 | 986 | bool is_single_hop_neigh = false; |
13b2541b | 987 | bool is_from_best_next_hop = false; |
fe8bc396 | 988 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 989 | uint32_t if_incoming_seqno; |
1eda58bf | 990 | uint8_t *prev_sender; |
fc957275 ML |
991 | |
992 | /* Silently drop when the batman packet is actually not a | |
993 | * correct packet. | |
994 | * | |
995 | * This might happen if a packet is padded (e.g. Ethernet has a | |
996 | * minimum frame length of 64 byte) and the aggregation interprets | |
997 | * it as an additional length. | |
998 | * | |
999 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1000 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1001 | * packet in an aggregation. Here we expect that the padding |
1002 | * is always zero (or not 0x01) | |
1003 | */ | |
96412690 | 1004 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1005 | return; |
1006 | ||
1007 | /* could be changed by schedule_own_packet() */ | |
1008 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
1009 | ||
96412690 | 1010 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1011 | has_directlink_flag = 1; |
1012 | else | |
1013 | has_directlink_flag = 0; | |
fc957275 | 1014 | |
96412690 | 1015 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1016 | is_single_hop_neigh = true; |
fc957275 | 1017 | |
39c75a51 | 1018 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1019 | "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", |
1020 | ethhdr->h_source, if_incoming->net_dev->name, | |
96412690 SE |
1021 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1022 | batadv_ogm_packet->prev_sender, | |
1023 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1024 | ntohs(batadv_ogm_packet->tt_crc), | |
1025 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1026 | batadv_ogm_packet->header.ttl, | |
1027 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1028 | |
1029 | rcu_read_lock(); | |
3193e8fd | 1030 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1031 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1032 | continue; |
1033 | ||
1034 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1035 | continue; | |
1036 | ||
1eda58bf SE |
1037 | if (batadv_compare_eth(ethhdr->h_source, |
1038 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1039 | is_my_addr = 1; |
1040 | ||
96412690 | 1041 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1042 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1043 | is_my_orig = 1; |
1044 | ||
96412690 | 1045 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1046 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1047 | is_my_oldorig = 1; |
1048 | ||
1049 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1050 | is_broadcast = 1; | |
1051 | } | |
1052 | rcu_read_unlock(); | |
1053 | ||
96412690 | 1054 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 1055 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1056 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 1057 | batadv_ogm_packet->header.version); |
fc957275 ML |
1058 | return; |
1059 | } | |
1060 | ||
1061 | if (is_my_addr) { | |
39c75a51 | 1062 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1063 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1064 | ethhdr->h_source); | |
fc957275 ML |
1065 | return; |
1066 | } | |
1067 | ||
1068 | if (is_broadcast) { | |
39c75a51 | 1069 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1070 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", |
1071 | ethhdr->h_source); | |
fc957275 ML |
1072 | return; |
1073 | } | |
1074 | ||
1075 | if (is_my_orig) { | |
1076 | unsigned long *word; | |
1077 | int offset; | |
9b4a1159 | 1078 | int32_t bit_pos; |
42d0b044 SE |
1079 | int16_t if_num; |
1080 | uint8_t *weight; | |
fc957275 | 1081 | |
7d211efc SE |
1082 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1083 | ethhdr->h_source); | |
fc957275 ML |
1084 | if (!orig_neigh_node) |
1085 | return; | |
1086 | ||
1087 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1088 | * come via the corresponding interface |
1089 | * save packet seqno for bidirectional check | |
1090 | */ | |
fc957275 | 1091 | if (has_directlink_flag && |
1eda58bf | 1092 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1093 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1094 | if_num = if_incoming->if_num; |
1095 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1096 | |
1097 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1098 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1099 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1100 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1101 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1102 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1103 | *weight = bitmap_weight(word, | |
1104 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1105 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1106 | } | |
1107 | ||
39c75a51 | 1108 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1109 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1110 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1111 | return; |
1112 | } | |
1113 | ||
1114 | if (is_my_oldorig) { | |
39c75a51 | 1115 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1116 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1117 | ethhdr->h_source); | |
fc957275 ML |
1118 | return; |
1119 | } | |
1120 | ||
96412690 | 1121 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1122 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1123 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1124 | ethhdr->h_source); | |
13b2541b ML |
1125 | return; |
1126 | } | |
1127 | ||
96412690 | 1128 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1129 | if (!orig_node) |
1130 | return; | |
1131 | ||
96412690 | 1132 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
fe8bc396 | 1133 | if_incoming); |
fc957275 ML |
1134 | |
1135 | if (is_duplicate == -1) { | |
39c75a51 | 1136 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1137 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1138 | ethhdr->h_source); | |
fc957275 ML |
1139 | goto out; |
1140 | } | |
1141 | ||
96412690 | 1142 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1143 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1144 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1145 | goto out; |
1146 | } | |
1147 | ||
7d211efc | 1148 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1149 | if (router) |
7d211efc | 1150 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1151 | |
13b2541b | 1152 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1153 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1154 | is_from_best_next_hop = true; |
1155 | ||
96412690 | 1156 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1157 | /* avoid temporary routing loops */ |
1158 | if (router && router_router && | |
1eda58bf | 1159 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1160 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1161 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1162 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1163 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1164 | ethhdr->h_source); | |
fc957275 ML |
1165 | goto out; |
1166 | } | |
1167 | ||
1168 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1169 | * originator mac |
1170 | */ | |
fc957275 ML |
1171 | orig_neigh_node = (is_single_hop_neigh ? |
1172 | orig_node : | |
7d211efc | 1173 | batadv_get_orig_node(bat_priv, ethhdr->h_source)); |
fc957275 ML |
1174 | if (!orig_neigh_node) |
1175 | goto out; | |
1176 | ||
7d211efc | 1177 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1178 | |
1179 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1180 | * don't route towards it |
1181 | */ | |
fc957275 | 1182 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1183 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1184 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1185 | goto out_neigh; |
1186 | } | |
1187 | ||
fe8bc396 | 1188 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1189 | batadv_ogm_packet, if_incoming); |
fc957275 | 1190 | |
30d3c511 | 1191 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1192 | batadv_ogm_packet); |
fc957275 ML |
1193 | |
1194 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1195 | * seqno and similar ttl as the non-duplicate |
1196 | */ | |
96412690 SE |
1197 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
1198 | simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; | |
fe8bc396 SE |
1199 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
1200 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
96412690 | 1201 | batadv_ogm_packet, if_incoming, |
fe8bc396 | 1202 | tt_buff, is_duplicate); |
fc957275 ML |
1203 | |
1204 | /* is single hop (direct) neighbor */ | |
1205 | if (is_single_hop_neigh) { | |
1206 | ||
1207 | /* mark direct link on incoming interface */ | |
96412690 | 1208 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1209 | is_single_hop_neigh, |
1210 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1211 | |
39c75a51 | 1212 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1213 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1214 | goto out_neigh; |
1215 | } | |
1216 | ||
1217 | /* multihop originator */ | |
fe8bc396 | 1218 | if (!is_bidirect) { |
39c75a51 | 1219 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1220 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1221 | goto out_neigh; |
1222 | } | |
1223 | ||
1224 | if (is_duplicate) { | |
39c75a51 | 1225 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1226 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1227 | goto out_neigh; |
1228 | } | |
1229 | ||
39c75a51 | 1230 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1231 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1232 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1233 | is_single_hop_neigh, is_from_best_next_hop, |
1234 | if_incoming); | |
fc957275 ML |
1235 | |
1236 | out_neigh: | |
1237 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1238 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1239 | out: |
1240 | if (router) | |
7d211efc | 1241 | batadv_neigh_node_free_ref(router); |
fc957275 | 1242 | if (router_router) |
7d211efc | 1243 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1244 | if (orig_neigh_router) |
7d211efc | 1245 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1246 | |
7d211efc | 1247 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1248 | } |
1249 | ||
fe8bc396 | 1250 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1251 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1252 | { |
56303d34 | 1253 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1254 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1255 | struct ethhdr *ethhdr; |
1256 | int buff_pos = 0, packet_len; | |
1257 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 ML |
1258 | bool ret; |
1259 | ||
7e071c79 | 1260 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1261 | if (!ret) |
1262 | return NET_RX_DROP; | |
fc957275 | 1263 | |
edbf12ba ML |
1264 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1265 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1266 | */ | |
fe8bc396 | 1267 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1268 | return NET_RX_DROP; |
1269 | ||
d69909d2 SE |
1270 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1271 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1272 | skb->len + ETH_HLEN); |
1273 | ||
8780dad9 ML |
1274 | packet_len = skb_headlen(skb); |
1275 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1276 | packet_buff = skb->data; | |
96412690 | 1277 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1278 | |
1279 | /* unpack the aggregated packets and process them one by one */ | |
1280 | do { | |
7e071c79 | 1281 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1282 | |
96412690 | 1283 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1284 | if_incoming); |
fc957275 | 1285 | |
7e071c79 | 1286 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1287 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1288 | |
96412690 | 1289 | batadv_ogm_packet = (struct batadv_ogm_packet *) |
fc957275 | 1290 | (packet_buff + buff_pos); |
fe8bc396 | 1291 | } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
96412690 | 1292 | batadv_ogm_packet->tt_num_changes)); |
c3e29312 ML |
1293 | |
1294 | kfree_skb(skb); | |
1295 | return NET_RX_SUCCESS; | |
fc957275 | 1296 | } |
1c280471 | 1297 | |
56303d34 | 1298 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1299 | .name = "BATMAN_IV", |
fe8bc396 SE |
1300 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1301 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1302 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1303 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1304 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1305 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1306 | }; |
1307 | ||
81c524f7 | 1308 | int __init batadv_iv_init(void) |
1c280471 | 1309 | { |
c3e29312 ML |
1310 | int ret; |
1311 | ||
1312 | /* batman originator packet */ | |
acd34afa SE |
1313 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1314 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1315 | if (ret < 0) |
1316 | goto out; | |
1317 | ||
fe8bc396 | 1318 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1319 | if (ret < 0) |
1320 | goto handler_unregister; | |
1321 | ||
1322 | goto out; | |
1323 | ||
1324 | handler_unregister: | |
acd34afa | 1325 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1326 | out: |
1327 | return ret; | |
1c280471 | 1328 | } |