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 | */ | |
b9dacc52 ML |
184 | if ((forw_packet->direct_link_flags & (1 << 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; | |
457 | ||
458 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
459 | memcpy(skb_buff, packet_buff, packet_len); | |
460 | forw_packet_aggr->packet_len += packet_len; | |
461 | forw_packet_aggr->num_packets++; | |
462 | ||
463 | /* save packet direct link flag status */ | |
464 | if (direct_link) | |
465 | forw_packet_aggr->direct_link_flags |= | |
466 | (1 << forw_packet_aggr->num_packets); | |
467 | } | |
468 | ||
56303d34 | 469 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
470 | unsigned char *packet_buff, |
471 | int packet_len, | |
56303d34 | 472 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 473 | int own_packet, unsigned long send_time) |
b9dacc52 | 474 | { |
9cfc7bd6 | 475 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
476 | * _pos -> pointer to the position in the queue |
477 | */ | |
56303d34 SE |
478 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
479 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
b9dacc52 | 480 | struct hlist_node *tmp_node; |
96412690 | 481 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 482 | bool direct_link; |
42d0b044 | 483 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 484 | |
96412690 SE |
485 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
486 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 487 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
488 | |
489 | /* find position for the packet in the forward queue */ | |
490 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
491 | /* own packets are not to be aggregated */ | |
492 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
493 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
494 | &bat_priv->forw_bat_list, list) { | |
96412690 | 495 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
496 | bat_priv, packet_len, |
497 | send_time, direct_link, | |
498 | if_incoming, | |
499 | forw_packet_pos)) { | |
b9dacc52 ML |
500 | forw_packet_aggr = forw_packet_pos; |
501 | break; | |
502 | } | |
503 | } | |
504 | } | |
505 | ||
506 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
507 | * suitable aggregation packet found |
508 | */ | |
b9dacc52 ML |
509 | if (!forw_packet_aggr) { |
510 | /* the following section can run without the lock */ | |
511 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
512 | ||
9cfc7bd6 | 513 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
514 | * we hold it back for a while, so that it might be aggregated |
515 | * later on | |
516 | */ | |
42d0b044 SE |
517 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
518 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 519 | |
fe8bc396 SE |
520 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
521 | send_time, direct_link, | |
522 | if_incoming, own_packet); | |
b9dacc52 | 523 | } else { |
fe8bc396 SE |
524 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
525 | packet_len, direct_link); | |
b9dacc52 ML |
526 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
527 | } | |
528 | } | |
529 | ||
56303d34 | 530 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 531 | const struct ethhdr *ethhdr, |
96412690 | 532 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
533 | bool is_single_hop_neigh, |
534 | bool is_from_best_next_hop, | |
56303d34 | 535 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 536 | { |
56303d34 | 537 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
538 | uint8_t tt_num_changes; |
539 | ||
96412690 | 540 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 541 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
542 | return; |
543 | } | |
544 | ||
13b2541b ML |
545 | if (!is_from_best_next_hop) { |
546 | /* Mark the forwarded packet when it is not coming from our | |
547 | * best next hop. We still need to forward the packet for our | |
548 | * neighbor link quality detection to work in case the packet | |
549 | * originated from a single hop neighbor. Otherwise we can | |
550 | * simply drop the ogm. | |
551 | */ | |
552 | if (is_single_hop_neigh) | |
96412690 | 553 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
554 | else |
555 | return; | |
556 | } | |
b9dacc52 | 557 | |
96412690 | 558 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 559 | |
96412690 SE |
560 | batadv_ogm_packet->header.ttl--; |
561 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 562 | |
b9dacc52 | 563 | /* apply hop penalty */ |
96412690 | 564 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 565 | bat_priv); |
b9dacc52 | 566 | |
39c75a51 | 567 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 568 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 569 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 570 | |
b9dacc52 | 571 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 572 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 573 | if (is_single_hop_neigh) |
96412690 | 574 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 575 | else |
96412690 | 576 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 577 | |
96412690 | 578 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 579 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 580 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
581 | } |
582 | ||
56303d34 | 583 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 584 | { |
56303d34 | 585 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
96412690 | 586 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 587 | struct batadv_hard_iface *primary_if; |
be9aa4c1 | 588 | int vis_server, tt_num_changes = 0; |
b9dacc52 ML |
589 | |
590 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 591 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 592 | |
be9aa4c1 ML |
593 | if (hard_iface == primary_if) |
594 | tt_num_changes = batadv_tt_append_diff(bat_priv, | |
595 | &hard_iface->packet_buff, | |
596 | &hard_iface->packet_len, | |
7e071c79 | 597 | BATADV_OGM_HLEN); |
be9aa4c1 | 598 | |
96412690 | 599 | batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff; |
b9dacc52 ML |
600 | |
601 | /* change sequence number to network order */ | |
96412690 | 602 | batadv_ogm_packet->seqno = |
b9dacc52 | 603 | htonl((uint32_t)atomic_read(&hard_iface->seqno)); |
be9aa4c1 | 604 | atomic_inc(&hard_iface->seqno); |
b9dacc52 | 605 | |
96412690 SE |
606 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn); |
607 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt_crc); | |
b9dacc52 | 608 | if (tt_num_changes >= 0) |
96412690 | 609 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 610 | |
acd34afa | 611 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 612 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 613 | else |
96412690 | 614 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 ML |
615 | |
616 | if ((hard_iface == primary_if) && | |
cd646ab1 | 617 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER)) |
96412690 | 618 | batadv_ogm_packet->gw_flags = |
b9dacc52 ML |
619 | (uint8_t)atomic_read(&bat_priv->gw_bandwidth); |
620 | else | |
96412690 | 621 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
b9dacc52 | 622 | |
30d3c511 | 623 | batadv_slide_own_bcast_window(hard_iface); |
fe8bc396 SE |
624 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff, |
625 | hard_iface->packet_len, hard_iface, 1, | |
626 | batadv_iv_ogm_emit_send_time(bat_priv)); | |
b9dacc52 ML |
627 | |
628 | if (primary_if) | |
e5d89254 | 629 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
630 | } |
631 | ||
fe8bc396 | 632 | static void |
56303d34 SE |
633 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
634 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 635 | const struct ethhdr *ethhdr, |
96412690 | 636 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 637 | struct batadv_hard_iface *if_incoming, |
fe8bc396 SE |
638 | const unsigned char *tt_buff, |
639 | int is_duplicate) | |
fc957275 | 640 | { |
56303d34 SE |
641 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
642 | struct batadv_neigh_node *router = NULL; | |
643 | struct batadv_orig_node *orig_node_tmp; | |
fc957275 ML |
644 | struct hlist_node *node; |
645 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; | |
1eda58bf | 646 | uint8_t *neigh_addr; |
fc957275 | 647 | |
39c75a51 | 648 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 649 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
650 | |
651 | rcu_read_lock(); | |
652 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
653 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
654 | neigh_addr = tmp_neigh_node->addr; |
655 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
656 | tmp_neigh_node->if_incoming == if_incoming && | |
657 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 658 | if (neigh_node) |
7d211efc | 659 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
660 | neigh_node = tmp_neigh_node; |
661 | continue; | |
662 | } | |
663 | ||
664 | if (is_duplicate) | |
665 | continue; | |
666 | ||
e3b0d0de | 667 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
668 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
669 | &tmp_neigh_node->tq_index, 0); | |
fc957275 | 670 | tmp_neigh_node->tq_avg = |
925a6672 | 671 | batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
e3b0d0de | 672 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
673 | } |
674 | ||
675 | if (!neigh_node) { | |
56303d34 | 676 | struct batadv_orig_node *orig_tmp; |
fc957275 | 677 | |
7d211efc | 678 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
679 | if (!orig_tmp) |
680 | goto unlock; | |
681 | ||
fe8bc396 SE |
682 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
683 | ethhdr->h_source, | |
684 | orig_node, orig_tmp, | |
96412690 | 685 | batadv_ogm_packet->seqno); |
fc957275 | 686 | |
7d211efc | 687 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
688 | if (!neigh_node) |
689 | goto unlock; | |
690 | } else | |
39c75a51 | 691 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 692 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
693 | |
694 | rcu_read_unlock(); | |
695 | ||
96412690 | 696 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 697 | neigh_node->last_seen = jiffies; |
fc957275 | 698 | |
e3b0d0de | 699 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
700 | batadv_ring_buffer_set(neigh_node->tq_recv, |
701 | &neigh_node->tq_index, | |
96412690 | 702 | batadv_ogm_packet->tq); |
925a6672 | 703 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 704 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
705 | |
706 | if (!is_duplicate) { | |
96412690 SE |
707 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
708 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
709 | } |
710 | ||
30d3c511 | 711 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
712 | |
713 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
714 | * to change |
715 | */ | |
7d211efc | 716 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
717 | if (router == neigh_node) |
718 | goto update_tt; | |
719 | ||
720 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
721 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
722 | goto update_tt; | |
723 | ||
724 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
725 | * won't consider it either |
726 | */ | |
fc957275 ML |
727 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
728 | orig_node_tmp = router->orig_node; | |
729 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
730 | bcast_own_sum_orig = | |
731 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
732 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
733 | ||
734 | orig_node_tmp = neigh_node->orig_node; | |
735 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
736 | bcast_own_sum_neigh = | |
737 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
738 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
739 | ||
740 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
741 | goto update_tt; | |
742 | } | |
743 | ||
30d3c511 | 744 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
745 | |
746 | update_tt: | |
747 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
748 | * sent through a primary interface |
749 | */ | |
96412690 SE |
750 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
751 | (batadv_ogm_packet->header.ttl > 2)) || | |
752 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 753 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
754 | batadv_ogm_packet->tt_num_changes, |
755 | batadv_ogm_packet->ttvn, | |
756 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 757 | |
96412690 | 758 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 759 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 760 | batadv_ogm_packet->gw_flags); |
fc957275 | 761 | |
96412690 | 762 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
763 | |
764 | /* restart gateway selection if fast or late switching was enabled */ | |
765 | if ((orig_node->gw_flags) && | |
cd646ab1 | 766 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 767 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 768 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
769 | |
770 | goto out; | |
771 | ||
772 | unlock: | |
773 | rcu_read_unlock(); | |
774 | out: | |
775 | if (neigh_node) | |
7d211efc | 776 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 777 | if (router) |
7d211efc | 778 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
779 | } |
780 | ||
56303d34 SE |
781 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
782 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 783 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 784 | struct batadv_hard_iface *if_incoming) |
fc957275 | 785 | { |
56303d34 SE |
786 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
787 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 ML |
788 | struct hlist_node *node; |
789 | uint8_t total_count; | |
42d0b044 SE |
790 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
791 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
792 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
793 | unsigned int combined_tq; | |
fc957275 ML |
794 | |
795 | /* find corresponding one hop neighbor */ | |
796 | rcu_read_lock(); | |
797 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
798 | &orig_neigh_node->neigh_list, list) { | |
799 | ||
1eda58bf SE |
800 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
801 | orig_neigh_node->orig)) | |
fc957275 ML |
802 | continue; |
803 | ||
804 | if (tmp_neigh_node->if_incoming != if_incoming) | |
805 | continue; | |
806 | ||
807 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
808 | continue; | |
809 | ||
810 | neigh_node = tmp_neigh_node; | |
811 | break; | |
812 | } | |
813 | rcu_read_unlock(); | |
814 | ||
815 | if (!neigh_node) | |
fe8bc396 SE |
816 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
817 | orig_neigh_node->orig, | |
818 | orig_neigh_node, | |
819 | orig_neigh_node, | |
96412690 | 820 | batadv_ogm_packet->seqno); |
fc957275 ML |
821 | |
822 | if (!neigh_node) | |
823 | goto out; | |
824 | ||
d7b2a97e | 825 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 826 | if (orig_node == orig_neigh_node) |
d7b2a97e | 827 | neigh_node->last_seen = jiffies; |
fc957275 | 828 | |
d7b2a97e | 829 | orig_node->last_seen = jiffies; |
fc957275 ML |
830 | |
831 | /* find packet count of corresponding one hop neighbor */ | |
832 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
833 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
834 | neigh_rq_count = neigh_node->real_packet_count; | |
835 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
836 | ||
837 | /* pay attention to not get a value bigger than 100 % */ | |
838 | total_count = (orig_eq_count > neigh_rq_count ? | |
839 | neigh_rq_count : orig_eq_count); | |
840 | ||
9cfc7bd6 SE |
841 | /* if we have too few packets (too less data) we set tq_own to zero |
842 | * if we receive too few packets it is not considered bidirectional | |
843 | */ | |
42d0b044 SE |
844 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
845 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
846 | tq_own = 0; |
847 | else | |
848 | /* neigh_node->real_packet_count is never zero as we | |
849 | * only purge old information when getting new | |
9cfc7bd6 SE |
850 | * information |
851 | */ | |
42d0b044 | 852 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 853 | |
21a1236b | 854 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
855 | * affect the nearly-symmetric links only a little, but |
856 | * punishes asymmetric links more. This will give a value | |
857 | * between 0 and TQ_MAX_VALUE | |
858 | */ | |
42d0b044 SE |
859 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
860 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
861 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
862 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
863 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
864 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
865 | inv_asym_penalty /= neigh_rq_max_cube; | |
866 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
867 | ||
96412690 | 868 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 869 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 870 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 871 | |
39c75a51 | 872 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
873 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
874 | orig_node->orig, orig_neigh_node->orig, total_count, | |
875 | neigh_rq_count, tq_own, | |
96412690 | 876 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
877 | |
878 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
879 | * consider it bidirectional |
880 | */ | |
96412690 | 881 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
882 | ret = 1; |
883 | ||
884 | out: | |
885 | if (neigh_node) | |
7d211efc | 886 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
887 | return ret; |
888 | } | |
889 | ||
890 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
891 | * finds out whether it is a duplicate. | |
892 | * returns: | |
893 | * 1 the packet is a duplicate | |
894 | * 0 the packet has not yet been received | |
895 | * -1 the packet is old and has been received while the seqno window | |
896 | * was protected. Caller should drop it. | |
897 | */ | |
fe8bc396 SE |
898 | static int |
899 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
96412690 | 900 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 901 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 902 | { |
56303d34 SE |
903 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
904 | struct batadv_orig_node *orig_node; | |
905 | struct batadv_neigh_node *tmp_neigh_node; | |
fc957275 ML |
906 | struct hlist_node *node; |
907 | int is_duplicate = 0; | |
908 | int32_t seq_diff; | |
909 | int need_update = 0; | |
910 | int set_mark, ret = -1; | |
96412690 | 911 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 912 | uint8_t *neigh_addr; |
fc957275 | 913 | |
96412690 | 914 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
915 | if (!orig_node) |
916 | return 0; | |
917 | ||
918 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 919 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
920 | |
921 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 922 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
923 | batadv_window_protected(bat_priv, seq_diff, |
924 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
925 | goto out; |
926 | ||
927 | rcu_read_lock(); | |
928 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
929 | &orig_node->neigh_list, list) { | |
930 | ||
9b4a1159 SE |
931 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
932 | orig_node->last_real_seqno, | |
933 | seqno); | |
fc957275 | 934 | |
1eda58bf SE |
935 | neigh_addr = tmp_neigh_node->addr; |
936 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
937 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
938 | set_mark = 1; |
939 | else | |
940 | set_mark = 0; | |
941 | ||
942 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
943 | need_update |= batadv_bit_get_packet(bat_priv, |
944 | tmp_neigh_node->real_bits, | |
945 | seq_diff, set_mark); | |
fc957275 ML |
946 | |
947 | tmp_neigh_node->real_packet_count = | |
0079d2ce | 948 | bitmap_weight(tmp_neigh_node->real_bits, |
42d0b044 | 949 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
fc957275 ML |
950 | } |
951 | rcu_read_unlock(); | |
952 | ||
953 | if (need_update) { | |
39c75a51 | 954 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
955 | "updating last_seqno: old %u, new %u\n", |
956 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 957 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
958 | } |
959 | ||
960 | ret = is_duplicate; | |
961 | ||
962 | out: | |
963 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 964 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
965 | return ret; |
966 | } | |
967 | ||
fe8bc396 | 968 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 969 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 970 | const unsigned char *tt_buff, |
56303d34 | 971 | struct batadv_hard_iface *if_incoming) |
fc957275 | 972 | { |
56303d34 SE |
973 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
974 | struct batadv_hard_iface *hard_iface; | |
975 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
976 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
977 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
978 | int has_directlink_flag; |
979 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
fe8bc396 | 980 | int is_broadcast = 0, is_bidirect; |
75cd33f8 | 981 | bool is_single_hop_neigh = false; |
13b2541b | 982 | bool is_from_best_next_hop = false; |
fe8bc396 | 983 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 984 | uint32_t if_incoming_seqno; |
1eda58bf | 985 | uint8_t *prev_sender; |
fc957275 ML |
986 | |
987 | /* Silently drop when the batman packet is actually not a | |
988 | * correct packet. | |
989 | * | |
990 | * This might happen if a packet is padded (e.g. Ethernet has a | |
991 | * minimum frame length of 64 byte) and the aggregation interprets | |
992 | * it as an additional length. | |
993 | * | |
994 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 995 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
996 | * packet in an aggregation. Here we expect that the padding |
997 | * is always zero (or not 0x01) | |
998 | */ | |
96412690 | 999 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1000 | return; |
1001 | ||
1002 | /* could be changed by schedule_own_packet() */ | |
1003 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
1004 | ||
96412690 | 1005 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1006 | has_directlink_flag = 1; |
1007 | else | |
1008 | has_directlink_flag = 0; | |
fc957275 | 1009 | |
96412690 | 1010 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1011 | is_single_hop_neigh = true; |
fc957275 | 1012 | |
39c75a51 | 1013 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1014 | "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", |
1015 | ethhdr->h_source, if_incoming->net_dev->name, | |
96412690 SE |
1016 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1017 | batadv_ogm_packet->prev_sender, | |
1018 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1019 | ntohs(batadv_ogm_packet->tt_crc), | |
1020 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1021 | batadv_ogm_packet->header.ttl, | |
1022 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1023 | |
1024 | rcu_read_lock(); | |
3193e8fd | 1025 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1026 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1027 | continue; |
1028 | ||
1029 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1030 | continue; | |
1031 | ||
1eda58bf SE |
1032 | if (batadv_compare_eth(ethhdr->h_source, |
1033 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1034 | is_my_addr = 1; |
1035 | ||
96412690 | 1036 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1037 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1038 | is_my_orig = 1; |
1039 | ||
96412690 | 1040 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1041 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1042 | is_my_oldorig = 1; |
1043 | ||
1044 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1045 | is_broadcast = 1; | |
1046 | } | |
1047 | rcu_read_unlock(); | |
1048 | ||
96412690 | 1049 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 1050 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1051 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 1052 | batadv_ogm_packet->header.version); |
fc957275 ML |
1053 | return; |
1054 | } | |
1055 | ||
1056 | if (is_my_addr) { | |
39c75a51 | 1057 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1058 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1059 | ethhdr->h_source); | |
fc957275 ML |
1060 | return; |
1061 | } | |
1062 | ||
1063 | if (is_broadcast) { | |
39c75a51 | 1064 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1065 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", |
1066 | ethhdr->h_source); | |
fc957275 ML |
1067 | return; |
1068 | } | |
1069 | ||
1070 | if (is_my_orig) { | |
1071 | unsigned long *word; | |
1072 | int offset; | |
9b4a1159 | 1073 | int32_t bit_pos; |
42d0b044 SE |
1074 | int16_t if_num; |
1075 | uint8_t *weight; | |
fc957275 | 1076 | |
7d211efc SE |
1077 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1078 | ethhdr->h_source); | |
fc957275 ML |
1079 | if (!orig_neigh_node) |
1080 | return; | |
1081 | ||
1082 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1083 | * come via the corresponding interface |
1084 | * save packet seqno for bidirectional check | |
1085 | */ | |
fc957275 | 1086 | if (has_directlink_flag && |
1eda58bf | 1087 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1088 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1089 | if_num = if_incoming->if_num; |
1090 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1091 | |
1092 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1093 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1094 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1095 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1096 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1097 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1098 | *weight = bitmap_weight(word, | |
1099 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1100 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1101 | } | |
1102 | ||
39c75a51 | 1103 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1104 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1105 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1106 | return; |
1107 | } | |
1108 | ||
1109 | if (is_my_oldorig) { | |
39c75a51 | 1110 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1111 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1112 | ethhdr->h_source); | |
fc957275 ML |
1113 | return; |
1114 | } | |
1115 | ||
96412690 | 1116 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1117 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1118 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1119 | ethhdr->h_source); | |
13b2541b ML |
1120 | return; |
1121 | } | |
1122 | ||
96412690 | 1123 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1124 | if (!orig_node) |
1125 | return; | |
1126 | ||
96412690 | 1127 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
fe8bc396 | 1128 | if_incoming); |
fc957275 ML |
1129 | |
1130 | if (is_duplicate == -1) { | |
39c75a51 | 1131 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1132 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1133 | ethhdr->h_source); | |
fc957275 ML |
1134 | goto out; |
1135 | } | |
1136 | ||
96412690 | 1137 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1138 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1139 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1140 | goto out; |
1141 | } | |
1142 | ||
7d211efc | 1143 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1144 | if (router) |
7d211efc | 1145 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1146 | |
13b2541b | 1147 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1148 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1149 | is_from_best_next_hop = true; |
1150 | ||
96412690 | 1151 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1152 | /* avoid temporary routing loops */ |
1153 | if (router && router_router && | |
1eda58bf | 1154 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1155 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1156 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1157 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1158 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1159 | ethhdr->h_source); | |
fc957275 ML |
1160 | goto out; |
1161 | } | |
1162 | ||
1163 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1164 | * originator mac |
1165 | */ | |
fc957275 ML |
1166 | orig_neigh_node = (is_single_hop_neigh ? |
1167 | orig_node : | |
7d211efc | 1168 | batadv_get_orig_node(bat_priv, ethhdr->h_source)); |
fc957275 ML |
1169 | if (!orig_neigh_node) |
1170 | goto out; | |
1171 | ||
7d211efc | 1172 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1173 | |
1174 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1175 | * don't route towards it |
1176 | */ | |
fc957275 | 1177 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1178 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1179 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1180 | goto out_neigh; |
1181 | } | |
1182 | ||
fe8bc396 | 1183 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1184 | batadv_ogm_packet, if_incoming); |
fc957275 | 1185 | |
30d3c511 | 1186 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1187 | batadv_ogm_packet); |
fc957275 ML |
1188 | |
1189 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1190 | * seqno and similar ttl as the non-duplicate |
1191 | */ | |
96412690 SE |
1192 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
1193 | simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; | |
fe8bc396 SE |
1194 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
1195 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
96412690 | 1196 | batadv_ogm_packet, if_incoming, |
fe8bc396 | 1197 | tt_buff, is_duplicate); |
fc957275 ML |
1198 | |
1199 | /* is single hop (direct) neighbor */ | |
1200 | if (is_single_hop_neigh) { | |
1201 | ||
1202 | /* mark direct link on incoming interface */ | |
96412690 | 1203 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1204 | is_single_hop_neigh, |
1205 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1206 | |
39c75a51 | 1207 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1208 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1209 | goto out_neigh; |
1210 | } | |
1211 | ||
1212 | /* multihop originator */ | |
fe8bc396 | 1213 | if (!is_bidirect) { |
39c75a51 | 1214 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1215 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1216 | goto out_neigh; |
1217 | } | |
1218 | ||
1219 | if (is_duplicate) { | |
39c75a51 | 1220 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1221 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1222 | goto out_neigh; |
1223 | } | |
1224 | ||
39c75a51 | 1225 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1226 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1227 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1228 | is_single_hop_neigh, is_from_best_next_hop, |
1229 | if_incoming); | |
fc957275 ML |
1230 | |
1231 | out_neigh: | |
1232 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1233 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1234 | out: |
1235 | if (router) | |
7d211efc | 1236 | batadv_neigh_node_free_ref(router); |
fc957275 | 1237 | if (router_router) |
7d211efc | 1238 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1239 | if (orig_neigh_router) |
7d211efc | 1240 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1241 | |
7d211efc | 1242 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1243 | } |
1244 | ||
fe8bc396 | 1245 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1246 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1247 | { |
56303d34 | 1248 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1249 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1250 | struct ethhdr *ethhdr; |
1251 | int buff_pos = 0, packet_len; | |
1252 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 ML |
1253 | bool ret; |
1254 | ||
7e071c79 | 1255 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1256 | if (!ret) |
1257 | return NET_RX_DROP; | |
fc957275 | 1258 | |
edbf12ba ML |
1259 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1260 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1261 | */ | |
fe8bc396 | 1262 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1263 | return NET_RX_DROP; |
1264 | ||
d69909d2 SE |
1265 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1266 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1267 | skb->len + ETH_HLEN); |
1268 | ||
8780dad9 ML |
1269 | packet_len = skb_headlen(skb); |
1270 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1271 | packet_buff = skb->data; | |
96412690 | 1272 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1273 | |
1274 | /* unpack the aggregated packets and process them one by one */ | |
1275 | do { | |
7e071c79 | 1276 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1277 | |
96412690 | 1278 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1279 | if_incoming); |
fc957275 | 1280 | |
7e071c79 | 1281 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1282 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1283 | |
96412690 | 1284 | batadv_ogm_packet = (struct batadv_ogm_packet *) |
fc957275 | 1285 | (packet_buff + buff_pos); |
fe8bc396 | 1286 | } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
96412690 | 1287 | batadv_ogm_packet->tt_num_changes)); |
c3e29312 ML |
1288 | |
1289 | kfree_skb(skb); | |
1290 | return NET_RX_SUCCESS; | |
fc957275 | 1291 | } |
1c280471 | 1292 | |
56303d34 | 1293 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1294 | .name = "BATMAN_IV", |
fe8bc396 SE |
1295 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1296 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1297 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1298 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1299 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1300 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1301 | }; |
1302 | ||
81c524f7 | 1303 | int __init batadv_iv_init(void) |
1c280471 | 1304 | { |
c3e29312 ML |
1305 | int ret; |
1306 | ||
1307 | /* batman originator packet */ | |
acd34afa SE |
1308 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1309 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1310 | if (ret < 0) |
1311 | goto out; | |
1312 | ||
fe8bc396 | 1313 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1314 | if (ret < 0) |
1315 | goto handler_unregister; | |
1316 | ||
1317 | goto out; | |
1318 | ||
1319 | handler_unregister: | |
acd34afa | 1320 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1321 | out: |
1322 | return ret; | |
1c280471 | 1323 | } |