Commit | Line | Data |
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0b873931 | 1 | /* Copyright (C) 2007-2013 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; |
14511519 | 60 | unsigned char *ogm_buff; |
d7d32ec0 | 61 | uint32_t random_seqno; |
5346c35e | 62 | int res = -ENOMEM; |
d7d32ec0 ML |
63 | |
64 | /* randomize initial seqno to avoid collision */ | |
65 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 66 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 67 | |
14511519 ML |
68 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
69 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
70 | if (!ogm_buff) | |
77af7575 ML |
71 | goto out; |
72 | ||
14511519 ML |
73 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
74 | ||
75 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
96412690 SE |
76 | batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; |
77 | batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; | |
78 | batadv_ogm_packet->header.ttl = 2; | |
79 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; | |
80 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
81 | batadv_ogm_packet->tt_num_changes = 0; | |
82 | batadv_ogm_packet->ttvn = 0; | |
77af7575 ML |
83 | |
84 | res = 0; | |
85 | ||
86 | out: | |
87 | return res; | |
d0b9fd89 ML |
88 | } |
89 | ||
56303d34 | 90 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 91 | { |
14511519 ML |
92 | kfree(hard_iface->bat_iv.ogm_buff); |
93 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
94 | } |
95 | ||
56303d34 | 96 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 97 | { |
96412690 | 98 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 99 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 100 | |
14511519 | 101 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 102 | memcpy(batadv_ogm_packet->orig, |
c3229398 | 103 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 104 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 105 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
106 | } |
107 | ||
56303d34 SE |
108 | static void |
109 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 110 | { |
96412690 | 111 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 112 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 113 | |
14511519 | 114 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 SE |
115 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
116 | batadv_ogm_packet->header.ttl = BATADV_TTL; | |
d0b9fd89 ML |
117 | } |
118 | ||
b9dacc52 | 119 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 120 | static unsigned long |
56303d34 | 121 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 122 | { |
42d0b044 SE |
123 | unsigned int msecs; |
124 | ||
125 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 126 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
127 | |
128 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
129 | } |
130 | ||
131 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 132 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 133 | { |
e76e4320 | 134 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
135 | } |
136 | ||
137 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
138 | static uint8_t batadv_hop_penalty(uint8_t tq, |
139 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
140 | { |
141 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
142 | int new_tq; |
143 | ||
144 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
145 | new_tq /= BATADV_TQ_MAX_VALUE; | |
146 | ||
147 | return new_tq; | |
b9dacc52 ML |
148 | } |
149 | ||
fc957275 | 150 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
151 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
152 | int tt_num_changes) | |
fc957275 | 153 | { |
08c36d3e SE |
154 | int next_buff_pos = 0; |
155 | ||
7e071c79 | 156 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 157 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
158 | |
159 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 160 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
161 | } |
162 | ||
b9dacc52 | 163 | /* send a batman ogm to a given interface */ |
56303d34 SE |
164 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
165 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 166 | { |
56303d34 | 167 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
168 | char *fwd_str; |
169 | uint8_t packet_num; | |
170 | int16_t buff_pos; | |
96412690 | 171 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 172 | struct sk_buff *skb; |
c67893d1 | 173 | uint8_t *packet_pos; |
b9dacc52 | 174 | |
e9a4f295 | 175 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
176 | return; |
177 | ||
178 | packet_num = 0; | |
179 | buff_pos = 0; | |
c67893d1 SE |
180 | packet_pos = forw_packet->skb->data; |
181 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
182 | |
183 | /* adjust all flags and log packets */ | |
fe8bc396 | 184 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
96412690 | 185 | batadv_ogm_packet->tt_num_changes)) { |
b9dacc52 | 186 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
187 | * ordinary base packet |
188 | */ | |
8de47de5 SE |
189 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
190 | forw_packet->if_incoming == hard_iface) | |
96412690 | 191 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 192 | else |
96412690 | 193 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 194 | |
c67893d1 SE |
195 | if (packet_num > 0 || !forw_packet->own) |
196 | fwd_str = "Forwarding"; | |
197 | else | |
198 | fwd_str = "Sending own"; | |
199 | ||
39c75a51 | 200 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
201 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
202 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
96412690 SE |
203 | batadv_ogm_packet->orig, |
204 | ntohl(batadv_ogm_packet->seqno), | |
205 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, | |
206 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? | |
1eda58bf | 207 | "on" : "off"), |
96412690 | 208 | batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
1eda58bf | 209 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 210 | |
7e071c79 | 211 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 212 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
b9dacc52 | 213 | packet_num++; |
c67893d1 SE |
214 | packet_pos = forw_packet->skb->data + buff_pos; |
215 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
216 | } |
217 | ||
218 | /* create clone because function is called more than once */ | |
219 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 220 | if (skb) { |
d69909d2 SE |
221 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
222 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 223 | skb->len + ETH_HLEN); |
3193e8fd | 224 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 225 | } |
b9dacc52 ML |
226 | } |
227 | ||
228 | /* send a batman ogm packet */ | |
56303d34 | 229 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 230 | { |
56303d34 | 231 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 232 | struct net_device *soft_iface; |
56303d34 SE |
233 | struct batadv_priv *bat_priv; |
234 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 235 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 236 | unsigned char directlink; |
c67893d1 | 237 | uint8_t *packet_pos; |
b9dacc52 | 238 | |
c67893d1 SE |
239 | packet_pos = forw_packet->skb->data; |
240 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
96412690 | 241 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
242 | |
243 | if (!forw_packet->if_incoming) { | |
86ceb360 | 244 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
245 | goto out; |
246 | } | |
247 | ||
248 | soft_iface = forw_packet->if_incoming->soft_iface; | |
249 | bat_priv = netdev_priv(soft_iface); | |
250 | ||
e9a4f295 | 251 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
252 | goto out; |
253 | ||
e5d89254 | 254 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
255 | if (!primary_if) |
256 | goto out; | |
257 | ||
9cfc7bd6 SE |
258 | /* multihomed peer assumed |
259 | * non-primary OGMs are only broadcasted on their interface | |
260 | */ | |
96412690 | 261 | if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
b9dacc52 | 262 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
b9dacc52 | 263 | /* FIXME: what about aggregated packets ? */ |
39c75a51 | 264 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
265 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
266 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
267 | batadv_ogm_packet->orig, |
268 | ntohl(batadv_ogm_packet->seqno), | |
269 | batadv_ogm_packet->header.ttl, | |
1eda58bf SE |
270 | forw_packet->if_incoming->net_dev->name, |
271 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
272 | |
273 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
274 | batadv_send_skb_packet(forw_packet->skb, |
275 | forw_packet->if_incoming, | |
3193e8fd | 276 | batadv_broadcast_addr); |
b9dacc52 ML |
277 | forw_packet->skb = NULL; |
278 | ||
279 | goto out; | |
280 | } | |
281 | ||
282 | /* broadcast on every interface */ | |
283 | rcu_read_lock(); | |
3193e8fd | 284 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
285 | if (hard_iface->soft_iface != soft_iface) |
286 | continue; | |
287 | ||
fe8bc396 | 288 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
289 | } |
290 | rcu_read_unlock(); | |
291 | ||
292 | out: | |
293 | if (primary_if) | |
e5d89254 | 294 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
295 | } |
296 | ||
297 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 298 | static bool |
96412690 | 299 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 300 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
301 | int packet_len, unsigned long send_time, |
302 | bool directlink, | |
56303d34 SE |
303 | const struct batadv_hard_iface *if_incoming, |
304 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 305 | { |
96412690 | 306 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 307 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 308 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 309 | bool res = false; |
42d0b044 | 310 | unsigned long aggregation_end_time; |
b9dacc52 | 311 | |
96412690 | 312 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
313 | aggregation_end_time = send_time; |
314 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 315 | |
9cfc7bd6 | 316 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
317 | * if: |
318 | * | |
319 | * - the send time is within our MAX_AGGREGATION_MS time | |
320 | * - the resulting packet wont be bigger than | |
321 | * MAX_AGGREGATION_BYTES | |
322 | */ | |
b9dacc52 | 323 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
324 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
325 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
9cfc7bd6 | 326 | /* check aggregation compatibility |
b9dacc52 ML |
327 | * -> direct link packets are broadcasted on |
328 | * their interface only | |
329 | * -> aggregate packet if the current packet is | |
330 | * a "global" packet as well as the base | |
331 | * packet | |
332 | */ | |
e5d89254 | 333 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
334 | if (!primary_if) |
335 | goto out; | |
336 | ||
337 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
338 | * are flooded through the net |
339 | */ | |
b9dacc52 | 340 | if ((!directlink) && |
96412690 SE |
341 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
342 | (batadv_ogm_packet->header.ttl != 1) && | |
b9dacc52 ML |
343 | |
344 | /* own packets originating non-primary | |
9cfc7bd6 SE |
345 | * interfaces leave only that interface |
346 | */ | |
b9dacc52 ML |
347 | ((!forw_packet->own) || |
348 | (forw_packet->if_incoming == primary_if))) { | |
349 | res = true; | |
350 | goto out; | |
351 | } | |
352 | ||
353 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
354 | * interface only - we still can aggregate |
355 | */ | |
b9dacc52 | 356 | if ((directlink) && |
fe8bc396 | 357 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
358 | (forw_packet->if_incoming == if_incoming) && |
359 | ||
360 | /* packets from direct neighbors or | |
361 | * own secondary interface packets | |
9cfc7bd6 SE |
362 | * (= secondary interface packets in general) |
363 | */ | |
96412690 | 364 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
365 | (forw_packet->own && |
366 | forw_packet->if_incoming != primary_if))) { | |
367 | res = true; | |
368 | goto out; | |
369 | } | |
370 | } | |
371 | ||
372 | out: | |
373 | if (primary_if) | |
e5d89254 | 374 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
375 | return res; |
376 | } | |
377 | ||
378 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
379 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
380 | int packet_len, unsigned long send_time, | |
381 | bool direct_link, | |
56303d34 | 382 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 383 | int own_packet) |
b9dacc52 | 384 | { |
56303d34 SE |
385 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
386 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 387 | unsigned char *skb_buff; |
42d0b044 | 388 | unsigned int skb_size; |
b9dacc52 ML |
389 | |
390 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
391 | return; | |
392 | ||
393 | /* own packet should always be scheduled */ | |
394 | if (!own_packet) { | |
3e34819e | 395 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 396 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 397 | "batman packet queue full\n"); |
b9dacc52 ML |
398 | goto out; |
399 | } | |
400 | } | |
401 | ||
402 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
403 | if (!forw_packet_aggr) { | |
404 | if (!own_packet) | |
405 | atomic_inc(&bat_priv->batman_queue_left); | |
406 | goto out; | |
407 | } | |
408 | ||
409 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 | 410 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
5b246574 | 411 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 412 | else |
5b246574 SE |
413 | skb_size = packet_len; |
414 | ||
415 | skb_size += ETH_HLEN + NET_IP_ALIGN; | |
b9dacc52 | 416 | |
42d0b044 | 417 | forw_packet_aggr->skb = dev_alloc_skb(skb_size); |
b9dacc52 ML |
418 | if (!forw_packet_aggr->skb) { |
419 | if (!own_packet) | |
420 | atomic_inc(&bat_priv->batman_queue_left); | |
421 | kfree(forw_packet_aggr); | |
422 | goto out; | |
423 | } | |
5b246574 | 424 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN); |
b9dacc52 ML |
425 | |
426 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
427 | ||
428 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
429 | forw_packet_aggr->packet_len = packet_len; | |
430 | memcpy(skb_buff, packet_buff, packet_len); | |
431 | ||
432 | forw_packet_aggr->own = own_packet; | |
433 | forw_packet_aggr->if_incoming = if_incoming; | |
434 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 435 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
436 | forw_packet_aggr->send_time = send_time; |
437 | ||
438 | /* save packet direct link flag status */ | |
439 | if (direct_link) | |
440 | forw_packet_aggr->direct_link_flags |= 1; | |
441 | ||
442 | /* add new packet to packet list */ | |
443 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
444 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
445 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
446 | ||
447 | /* start timer for this packet */ | |
448 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 449 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 450 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
451 | &forw_packet_aggr->delayed_work, |
452 | send_time - jiffies); | |
453 | ||
454 | return; | |
455 | out: | |
e5d89254 | 456 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
457 | } |
458 | ||
459 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 460 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
461 | const unsigned char *packet_buff, |
462 | int packet_len, bool direct_link) | |
b9dacc52 ML |
463 | { |
464 | unsigned char *skb_buff; | |
8de47de5 | 465 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
466 | |
467 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
468 | memcpy(skb_buff, packet_buff, packet_len); | |
469 | forw_packet_aggr->packet_len += packet_len; | |
470 | forw_packet_aggr->num_packets++; | |
471 | ||
472 | /* save packet direct link flag status */ | |
8de47de5 SE |
473 | if (direct_link) { |
474 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
475 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
476 | } | |
b9dacc52 ML |
477 | } |
478 | ||
56303d34 | 479 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
480 | unsigned char *packet_buff, |
481 | int packet_len, | |
56303d34 | 482 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 483 | int own_packet, unsigned long send_time) |
b9dacc52 | 484 | { |
9cfc7bd6 | 485 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
486 | * _pos -> pointer to the position in the queue |
487 | */ | |
56303d34 SE |
488 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
489 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
b9dacc52 | 490 | struct hlist_node *tmp_node; |
96412690 | 491 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 492 | bool direct_link; |
42d0b044 | 493 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 494 | |
96412690 SE |
495 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
496 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 497 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
498 | |
499 | /* find position for the packet in the forward queue */ | |
500 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
501 | /* own packets are not to be aggregated */ | |
502 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
503 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
504 | &bat_priv->forw_bat_list, list) { | |
96412690 | 505 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
506 | bat_priv, packet_len, |
507 | send_time, direct_link, | |
508 | if_incoming, | |
509 | forw_packet_pos)) { | |
b9dacc52 ML |
510 | forw_packet_aggr = forw_packet_pos; |
511 | break; | |
512 | } | |
513 | } | |
514 | } | |
515 | ||
516 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
517 | * suitable aggregation packet found |
518 | */ | |
b9dacc52 ML |
519 | if (!forw_packet_aggr) { |
520 | /* the following section can run without the lock */ | |
521 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
522 | ||
9cfc7bd6 | 523 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
524 | * we hold it back for a while, so that it might be aggregated |
525 | * later on | |
526 | */ | |
42d0b044 SE |
527 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
528 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 529 | |
fe8bc396 SE |
530 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
531 | send_time, direct_link, | |
532 | if_incoming, own_packet); | |
b9dacc52 | 533 | } else { |
fe8bc396 SE |
534 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
535 | packet_len, direct_link); | |
b9dacc52 ML |
536 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
537 | } | |
538 | } | |
539 | ||
56303d34 | 540 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 541 | const struct ethhdr *ethhdr, |
96412690 | 542 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
543 | bool is_single_hop_neigh, |
544 | bool is_from_best_next_hop, | |
56303d34 | 545 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 546 | { |
56303d34 | 547 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
548 | uint8_t tt_num_changes; |
549 | ||
96412690 | 550 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 551 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
552 | return; |
553 | } | |
554 | ||
13b2541b ML |
555 | if (!is_from_best_next_hop) { |
556 | /* Mark the forwarded packet when it is not coming from our | |
557 | * best next hop. We still need to forward the packet for our | |
558 | * neighbor link quality detection to work in case the packet | |
559 | * originated from a single hop neighbor. Otherwise we can | |
560 | * simply drop the ogm. | |
561 | */ | |
562 | if (is_single_hop_neigh) | |
96412690 | 563 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
564 | else |
565 | return; | |
566 | } | |
b9dacc52 | 567 | |
96412690 | 568 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 569 | |
96412690 SE |
570 | batadv_ogm_packet->header.ttl--; |
571 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 572 | |
b9dacc52 | 573 | /* apply hop penalty */ |
96412690 | 574 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 575 | bat_priv); |
b9dacc52 | 576 | |
39c75a51 | 577 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 578 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 579 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 580 | |
b9dacc52 | 581 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 582 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 583 | if (is_single_hop_neigh) |
96412690 | 584 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 585 | else |
96412690 | 586 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 587 | |
96412690 | 588 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 589 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 590 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
591 | } |
592 | ||
56303d34 | 593 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 594 | { |
56303d34 | 595 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 596 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 597 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 598 | struct batadv_hard_iface *primary_if; |
14511519 | 599 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
be9aa4c1 | 600 | int vis_server, tt_num_changes = 0; |
bbb1f90e SE |
601 | uint32_t seqno; |
602 | uint8_t bandwidth; | |
b9dacc52 ML |
603 | |
604 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 605 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 606 | |
be9aa4c1 | 607 | if (hard_iface == primary_if) |
14511519 ML |
608 | tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, |
609 | ogm_buff_len, | |
7e071c79 | 610 | BATADV_OGM_HLEN); |
be9aa4c1 | 611 | |
14511519 | 612 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
b9dacc52 ML |
613 | |
614 | /* change sequence number to network order */ | |
14511519 | 615 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 616 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 617 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 618 | |
807736f6 SE |
619 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
620 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); | |
b9dacc52 | 621 | if (tt_num_changes >= 0) |
96412690 | 622 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 623 | |
acd34afa | 624 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 625 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 626 | else |
96412690 | 627 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 | 628 | |
bbb1f90e SE |
629 | if (hard_iface == primary_if && |
630 | atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { | |
631 | bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
632 | batadv_ogm_packet->gw_flags = bandwidth; | |
633 | } else { | |
96412690 | 634 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
bbb1f90e | 635 | } |
b9dacc52 | 636 | |
30d3c511 | 637 | batadv_slide_own_bcast_window(hard_iface); |
14511519 ML |
638 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
639 | hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, | |
fe8bc396 | 640 | batadv_iv_ogm_emit_send_time(bat_priv)); |
b9dacc52 ML |
641 | |
642 | if (primary_if) | |
e5d89254 | 643 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
644 | } |
645 | ||
fe8bc396 | 646 | static void |
56303d34 SE |
647 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
648 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 649 | const struct ethhdr *ethhdr, |
96412690 | 650 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 651 | struct batadv_hard_iface *if_incoming, |
fe8bc396 SE |
652 | const unsigned char *tt_buff, |
653 | int is_duplicate) | |
fc957275 | 654 | { |
56303d34 SE |
655 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
656 | struct batadv_neigh_node *router = NULL; | |
657 | struct batadv_orig_node *orig_node_tmp; | |
fc957275 | 658 | struct hlist_node *node; |
7caf69fb | 659 | int if_num; |
bbb1f90e | 660 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 661 | uint8_t *neigh_addr; |
bbb1f90e | 662 | uint8_t tq_avg; |
fc957275 | 663 | |
39c75a51 | 664 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 665 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
666 | |
667 | rcu_read_lock(); | |
668 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
669 | &orig_node->neigh_list, list) { | |
1eda58bf SE |
670 | neigh_addr = tmp_neigh_node->addr; |
671 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
672 | tmp_neigh_node->if_incoming == if_incoming && | |
673 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
fc957275 | 674 | if (neigh_node) |
7d211efc | 675 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
676 | neigh_node = tmp_neigh_node; |
677 | continue; | |
678 | } | |
679 | ||
680 | if (is_duplicate) | |
681 | continue; | |
682 | ||
e3b0d0de | 683 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
684 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
685 | &tmp_neigh_node->tq_index, 0); | |
bbb1f90e SE |
686 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
687 | tmp_neigh_node->tq_avg = tq_avg; | |
e3b0d0de | 688 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
689 | } |
690 | ||
691 | if (!neigh_node) { | |
56303d34 | 692 | struct batadv_orig_node *orig_tmp; |
fc957275 | 693 | |
7d211efc | 694 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
695 | if (!orig_tmp) |
696 | goto unlock; | |
697 | ||
fe8bc396 SE |
698 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
699 | ethhdr->h_source, | |
700 | orig_node, orig_tmp, | |
96412690 | 701 | batadv_ogm_packet->seqno); |
fc957275 | 702 | |
7d211efc | 703 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
704 | if (!neigh_node) |
705 | goto unlock; | |
706 | } else | |
39c75a51 | 707 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 708 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
709 | |
710 | rcu_read_unlock(); | |
711 | ||
96412690 | 712 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 713 | neigh_node->last_seen = jiffies; |
fc957275 | 714 | |
e3b0d0de | 715 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
716 | batadv_ring_buffer_set(neigh_node->tq_recv, |
717 | &neigh_node->tq_index, | |
96412690 | 718 | batadv_ogm_packet->tq); |
925a6672 | 719 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 720 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
721 | |
722 | if (!is_duplicate) { | |
96412690 SE |
723 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
724 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
725 | } |
726 | ||
30d3c511 | 727 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
728 | |
729 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
730 | * to change |
731 | */ | |
7d211efc | 732 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
733 | if (router == neigh_node) |
734 | goto update_tt; | |
735 | ||
736 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
737 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
738 | goto update_tt; | |
739 | ||
740 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
741 | * won't consider it either |
742 | */ | |
fc957275 ML |
743 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
744 | orig_node_tmp = router->orig_node; | |
745 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
746 | if_num = router->if_incoming->if_num; |
747 | sum_orig = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
748 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
749 | ||
750 | orig_node_tmp = neigh_node->orig_node; | |
751 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
752 | if_num = neigh_node->if_incoming->if_num; |
753 | sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
754 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
755 | ||
bbb1f90e | 756 | if (sum_orig >= sum_neigh) |
fc957275 ML |
757 | goto update_tt; |
758 | } | |
759 | ||
30d3c511 | 760 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
761 | |
762 | update_tt: | |
763 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
764 | * sent through a primary interface |
765 | */ | |
96412690 SE |
766 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
767 | (batadv_ogm_packet->header.ttl > 2)) || | |
768 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 769 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
770 | batadv_ogm_packet->tt_num_changes, |
771 | batadv_ogm_packet->ttvn, | |
772 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 773 | |
96412690 | 774 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 775 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 776 | batadv_ogm_packet->gw_flags); |
fc957275 | 777 | |
96412690 | 778 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
779 | |
780 | /* restart gateway selection if fast or late switching was enabled */ | |
781 | if ((orig_node->gw_flags) && | |
cd646ab1 | 782 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 783 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 784 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
785 | |
786 | goto out; | |
787 | ||
788 | unlock: | |
789 | rcu_read_unlock(); | |
790 | out: | |
791 | if (neigh_node) | |
7d211efc | 792 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 793 | if (router) |
7d211efc | 794 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
795 | } |
796 | ||
56303d34 SE |
797 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
798 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 799 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 800 | struct batadv_hard_iface *if_incoming) |
fc957275 | 801 | { |
56303d34 SE |
802 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
803 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 ML |
804 | struct hlist_node *node; |
805 | uint8_t total_count; | |
42d0b044 SE |
806 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
807 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
808 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
809 | unsigned int combined_tq; | |
fc957275 ML |
810 | |
811 | /* find corresponding one hop neighbor */ | |
812 | rcu_read_lock(); | |
813 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
814 | &orig_neigh_node->neigh_list, list) { | |
1eda58bf SE |
815 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
816 | orig_neigh_node->orig)) | |
fc957275 ML |
817 | continue; |
818 | ||
819 | if (tmp_neigh_node->if_incoming != if_incoming) | |
820 | continue; | |
821 | ||
822 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
823 | continue; | |
824 | ||
825 | neigh_node = tmp_neigh_node; | |
826 | break; | |
827 | } | |
828 | rcu_read_unlock(); | |
829 | ||
830 | if (!neigh_node) | |
fe8bc396 SE |
831 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
832 | orig_neigh_node->orig, | |
833 | orig_neigh_node, | |
834 | orig_neigh_node, | |
96412690 | 835 | batadv_ogm_packet->seqno); |
fc957275 ML |
836 | |
837 | if (!neigh_node) | |
838 | goto out; | |
839 | ||
d7b2a97e | 840 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 841 | if (orig_node == orig_neigh_node) |
d7b2a97e | 842 | neigh_node->last_seen = jiffies; |
fc957275 | 843 | |
d7b2a97e | 844 | orig_node->last_seen = jiffies; |
fc957275 ML |
845 | |
846 | /* find packet count of corresponding one hop neighbor */ | |
847 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
848 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
849 | neigh_rq_count = neigh_node->real_packet_count; | |
850 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
851 | ||
852 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
853 | if (orig_eq_count > neigh_rq_count) |
854 | total_count = neigh_rq_count; | |
855 | else | |
856 | total_count = orig_eq_count; | |
fc957275 | 857 | |
9cfc7bd6 SE |
858 | /* if we have too few packets (too less data) we set tq_own to zero |
859 | * if we receive too few packets it is not considered bidirectional | |
860 | */ | |
42d0b044 SE |
861 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
862 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
863 | tq_own = 0; |
864 | else | |
865 | /* neigh_node->real_packet_count is never zero as we | |
866 | * only purge old information when getting new | |
9cfc7bd6 SE |
867 | * information |
868 | */ | |
42d0b044 | 869 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 870 | |
21a1236b | 871 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
872 | * affect the nearly-symmetric links only a little, but |
873 | * punishes asymmetric links more. This will give a value | |
874 | * between 0 and TQ_MAX_VALUE | |
875 | */ | |
42d0b044 SE |
876 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
877 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
878 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
879 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
880 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
881 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
882 | inv_asym_penalty /= neigh_rq_max_cube; | |
883 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
884 | ||
96412690 | 885 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 886 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 887 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 888 | |
39c75a51 | 889 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
890 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
891 | orig_node->orig, orig_neigh_node->orig, total_count, | |
892 | neigh_rq_count, tq_own, | |
96412690 | 893 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
894 | |
895 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
896 | * consider it bidirectional |
897 | */ | |
96412690 | 898 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
899 | ret = 1; |
900 | ||
901 | out: | |
902 | if (neigh_node) | |
7d211efc | 903 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
904 | return ret; |
905 | } | |
906 | ||
907 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
908 | * finds out whether it is a duplicate. | |
909 | * returns: | |
910 | * 1 the packet is a duplicate | |
911 | * 0 the packet has not yet been received | |
912 | * -1 the packet is old and has been received while the seqno window | |
913 | * was protected. Caller should drop it. | |
914 | */ | |
fe8bc396 SE |
915 | static int |
916 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
96412690 | 917 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 918 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 919 | { |
56303d34 SE |
920 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
921 | struct batadv_orig_node *orig_node; | |
922 | struct batadv_neigh_node *tmp_neigh_node; | |
fc957275 ML |
923 | struct hlist_node *node; |
924 | int is_duplicate = 0; | |
925 | int32_t seq_diff; | |
926 | int need_update = 0; | |
927 | int set_mark, ret = -1; | |
96412690 | 928 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 929 | uint8_t *neigh_addr; |
bbb1f90e | 930 | uint8_t packet_count; |
fc957275 | 931 | |
96412690 | 932 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
933 | if (!orig_node) |
934 | return 0; | |
935 | ||
936 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 937 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
938 | |
939 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 940 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
941 | batadv_window_protected(bat_priv, seq_diff, |
942 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
943 | goto out; |
944 | ||
945 | rcu_read_lock(); | |
946 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
947 | &orig_node->neigh_list, list) { | |
9b4a1159 SE |
948 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
949 | orig_node->last_real_seqno, | |
950 | seqno); | |
fc957275 | 951 | |
1eda58bf SE |
952 | neigh_addr = tmp_neigh_node->addr; |
953 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
954 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
955 | set_mark = 1; |
956 | else | |
957 | set_mark = 0; | |
958 | ||
959 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
960 | need_update |= batadv_bit_get_packet(bat_priv, |
961 | tmp_neigh_node->real_bits, | |
962 | seq_diff, set_mark); | |
fc957275 | 963 | |
bbb1f90e SE |
964 | packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
965 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
966 | tmp_neigh_node->real_packet_count = packet_count; | |
fc957275 ML |
967 | } |
968 | rcu_read_unlock(); | |
969 | ||
970 | if (need_update) { | |
39c75a51 | 971 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
972 | "updating last_seqno: old %u, new %u\n", |
973 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 974 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
975 | } |
976 | ||
977 | ret = is_duplicate; | |
978 | ||
979 | out: | |
980 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 981 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
982 | return ret; |
983 | } | |
984 | ||
fe8bc396 | 985 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 986 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 987 | const unsigned char *tt_buff, |
56303d34 | 988 | struct batadv_hard_iface *if_incoming) |
fc957275 | 989 | { |
56303d34 SE |
990 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
991 | struct batadv_hard_iface *hard_iface; | |
992 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
993 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
994 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
995 | int has_directlink_flag; |
996 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
fe8bc396 | 997 | int is_broadcast = 0, is_bidirect; |
75cd33f8 | 998 | bool is_single_hop_neigh = false; |
13b2541b | 999 | bool is_from_best_next_hop = false; |
fe8bc396 | 1000 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 1001 | uint32_t if_incoming_seqno; |
1eda58bf | 1002 | uint8_t *prev_sender; |
fc957275 ML |
1003 | |
1004 | /* Silently drop when the batman packet is actually not a | |
1005 | * correct packet. | |
1006 | * | |
1007 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1008 | * minimum frame length of 64 byte) and the aggregation interprets | |
1009 | * it as an additional length. | |
1010 | * | |
1011 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1012 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1013 | * packet in an aggregation. Here we expect that the padding |
1014 | * is always zero (or not 0x01) | |
1015 | */ | |
96412690 | 1016 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1017 | return; |
1018 | ||
1019 | /* could be changed by schedule_own_packet() */ | |
14511519 | 1020 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
fc957275 | 1021 | |
96412690 | 1022 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1023 | has_directlink_flag = 1; |
1024 | else | |
1025 | has_directlink_flag = 0; | |
fc957275 | 1026 | |
96412690 | 1027 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1028 | is_single_hop_neigh = true; |
fc957275 | 1029 | |
39c75a51 | 1030 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0275e24 | 1031 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n", |
1eda58bf | 1032 | ethhdr->h_source, if_incoming->net_dev->name, |
96412690 SE |
1033 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1034 | batadv_ogm_packet->prev_sender, | |
1035 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1036 | ntohs(batadv_ogm_packet->tt_crc), | |
1037 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1038 | batadv_ogm_packet->header.ttl, | |
1039 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1040 | |
1041 | rcu_read_lock(); | |
3193e8fd | 1042 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1043 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1044 | continue; |
1045 | ||
1046 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1047 | continue; | |
1048 | ||
1eda58bf SE |
1049 | if (batadv_compare_eth(ethhdr->h_source, |
1050 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1051 | is_my_addr = 1; |
1052 | ||
96412690 | 1053 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1054 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1055 | is_my_orig = 1; |
1056 | ||
96412690 | 1057 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1058 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1059 | is_my_oldorig = 1; |
1060 | ||
1061 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1062 | is_broadcast = 1; | |
1063 | } | |
1064 | rcu_read_unlock(); | |
1065 | ||
96412690 | 1066 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 1067 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1068 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 1069 | batadv_ogm_packet->header.version); |
fc957275 ML |
1070 | return; |
1071 | } | |
1072 | ||
1073 | if (is_my_addr) { | |
39c75a51 | 1074 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1075 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1076 | ethhdr->h_source); | |
fc957275 ML |
1077 | return; |
1078 | } | |
1079 | ||
1080 | if (is_broadcast) { | |
39c75a51 | 1081 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1082 | "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", |
1083 | ethhdr->h_source); | |
fc957275 ML |
1084 | return; |
1085 | } | |
1086 | ||
1087 | if (is_my_orig) { | |
1088 | unsigned long *word; | |
1089 | int offset; | |
9b4a1159 | 1090 | int32_t bit_pos; |
42d0b044 SE |
1091 | int16_t if_num; |
1092 | uint8_t *weight; | |
fc957275 | 1093 | |
7d211efc SE |
1094 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1095 | ethhdr->h_source); | |
fc957275 ML |
1096 | if (!orig_neigh_node) |
1097 | return; | |
1098 | ||
1099 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1100 | * come via the corresponding interface |
1101 | * save packet seqno for bidirectional check | |
1102 | */ | |
fc957275 | 1103 | if (has_directlink_flag && |
1eda58bf | 1104 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1105 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1106 | if_num = if_incoming->if_num; |
1107 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1108 | |
1109 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1110 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1111 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1112 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1113 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1114 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1115 | *weight = bitmap_weight(word, | |
1116 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1117 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1118 | } | |
1119 | ||
39c75a51 | 1120 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1121 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1122 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1123 | return; |
1124 | } | |
1125 | ||
1126 | if (is_my_oldorig) { | |
39c75a51 | 1127 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1128 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1129 | ethhdr->h_source); | |
fc957275 ML |
1130 | return; |
1131 | } | |
1132 | ||
96412690 | 1133 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1134 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1135 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1136 | ethhdr->h_source); | |
13b2541b ML |
1137 | return; |
1138 | } | |
1139 | ||
96412690 | 1140 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1141 | if (!orig_node) |
1142 | return; | |
1143 | ||
96412690 | 1144 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
fe8bc396 | 1145 | if_incoming); |
fc957275 ML |
1146 | |
1147 | if (is_duplicate == -1) { | |
39c75a51 | 1148 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1149 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1150 | ethhdr->h_source); | |
fc957275 ML |
1151 | goto out; |
1152 | } | |
1153 | ||
96412690 | 1154 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1155 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1156 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1157 | goto out; |
1158 | } | |
1159 | ||
7d211efc | 1160 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1161 | if (router) |
7d211efc | 1162 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1163 | |
13b2541b | 1164 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1165 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1166 | is_from_best_next_hop = true; |
1167 | ||
96412690 | 1168 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1169 | /* avoid temporary routing loops */ |
1170 | if (router && router_router && | |
1eda58bf | 1171 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1172 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1173 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1174 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1175 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1176 | ethhdr->h_source); | |
fc957275 ML |
1177 | goto out; |
1178 | } | |
1179 | ||
1180 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1181 | * originator mac |
1182 | */ | |
c67893d1 SE |
1183 | if (is_single_hop_neigh) |
1184 | orig_neigh_node = orig_node; | |
1185 | else | |
1186 | orig_neigh_node = batadv_get_orig_node(bat_priv, | |
1187 | ethhdr->h_source); | |
1188 | ||
fc957275 ML |
1189 | if (!orig_neigh_node) |
1190 | goto out; | |
1191 | ||
7d211efc | 1192 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1193 | |
1194 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1195 | * don't route towards it |
1196 | */ | |
fc957275 | 1197 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1198 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1199 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1200 | goto out_neigh; |
1201 | } | |
1202 | ||
fe8bc396 | 1203 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1204 | batadv_ogm_packet, if_incoming); |
fc957275 | 1205 | |
30d3c511 | 1206 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1207 | batadv_ogm_packet); |
fc957275 ML |
1208 | |
1209 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1210 | * seqno and similar ttl as the non-duplicate |
1211 | */ | |
96412690 SE |
1212 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
1213 | simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; | |
fe8bc396 SE |
1214 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
1215 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
96412690 | 1216 | batadv_ogm_packet, if_incoming, |
fe8bc396 | 1217 | tt_buff, is_duplicate); |
fc957275 ML |
1218 | |
1219 | /* is single hop (direct) neighbor */ | |
1220 | if (is_single_hop_neigh) { | |
fc957275 | 1221 | /* mark direct link on incoming interface */ |
96412690 | 1222 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1223 | is_single_hop_neigh, |
1224 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1225 | |
39c75a51 | 1226 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1227 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1228 | goto out_neigh; |
1229 | } | |
1230 | ||
1231 | /* multihop originator */ | |
fe8bc396 | 1232 | if (!is_bidirect) { |
39c75a51 | 1233 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1234 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1235 | goto out_neigh; |
1236 | } | |
1237 | ||
1238 | if (is_duplicate) { | |
39c75a51 | 1239 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1240 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1241 | goto out_neigh; |
1242 | } | |
1243 | ||
39c75a51 | 1244 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1245 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1246 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1247 | is_single_hop_neigh, is_from_best_next_hop, |
1248 | if_incoming); | |
fc957275 ML |
1249 | |
1250 | out_neigh: | |
1251 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1252 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1253 | out: |
1254 | if (router) | |
7d211efc | 1255 | batadv_neigh_node_free_ref(router); |
fc957275 | 1256 | if (router_router) |
7d211efc | 1257 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1258 | if (orig_neigh_router) |
7d211efc | 1259 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1260 | |
7d211efc | 1261 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1262 | } |
1263 | ||
fe8bc396 | 1264 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1265 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1266 | { |
56303d34 | 1267 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1268 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1269 | struct ethhdr *ethhdr; |
1270 | int buff_pos = 0, packet_len; | |
1271 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 | 1272 | bool ret; |
c67893d1 | 1273 | uint8_t *packet_pos; |
c3e29312 | 1274 | |
7e071c79 | 1275 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1276 | if (!ret) |
1277 | return NET_RX_DROP; | |
fc957275 | 1278 | |
edbf12ba ML |
1279 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1280 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1281 | */ | |
fe8bc396 | 1282 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1283 | return NET_RX_DROP; |
1284 | ||
d69909d2 SE |
1285 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1286 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1287 | skb->len + ETH_HLEN); |
1288 | ||
8780dad9 ML |
1289 | packet_len = skb_headlen(skb); |
1290 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1291 | packet_buff = skb->data; | |
96412690 | 1292 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1293 | |
1294 | /* unpack the aggregated packets and process them one by one */ | |
1295 | do { | |
7e071c79 | 1296 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1297 | |
96412690 | 1298 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1299 | if_incoming); |
fc957275 | 1300 | |
7e071c79 | 1301 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1302 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1303 | |
c67893d1 SE |
1304 | packet_pos = packet_buff + buff_pos; |
1305 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
fe8bc396 | 1306 | } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
96412690 | 1307 | batadv_ogm_packet->tt_num_changes)); |
c3e29312 ML |
1308 | |
1309 | kfree_skb(skb); | |
1310 | return NET_RX_SUCCESS; | |
fc957275 | 1311 | } |
1c280471 | 1312 | |
56303d34 | 1313 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1314 | .name = "BATMAN_IV", |
fe8bc396 SE |
1315 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1316 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1317 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1318 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1319 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1320 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1321 | }; |
1322 | ||
81c524f7 | 1323 | int __init batadv_iv_init(void) |
1c280471 | 1324 | { |
c3e29312 ML |
1325 | int ret; |
1326 | ||
1327 | /* batman originator packet */ | |
acd34afa SE |
1328 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1329 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1330 | if (ret < 0) |
1331 | goto out; | |
1332 | ||
fe8bc396 | 1333 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1334 | if (ret < 0) |
1335 | goto handler_unregister; | |
1336 | ||
1337 | goto out; | |
1338 | ||
1339 | handler_unregister: | |
acd34afa | 1340 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1341 | out: |
1342 | return ret; | |
1c280471 | 1343 | } |