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 | 21 | #include "translation-table.h" |
fc957275 ML |
22 | #include "originator.h" |
23 | #include "routing.h" | |
24 | #include "gateway_common.h" | |
25 | #include "gateway_client.h" | |
26 | #include "hard-interface.h" | |
27 | #include "send.h" | |
1c280471 | 28 | #include "bat_algo.h" |
d56b1705 | 29 | #include "network-coding.h" |
fc957275 | 30 | |
24a5deeb AQ |
31 | /** |
32 | * batadv_ring_buffer_set - update the ring buffer with the given value | |
33 | * @lq_recv: pointer to the ring buffer | |
34 | * @lq_index: index to store the value at | |
35 | * @value: value to store in the ring buffer | |
36 | */ | |
37 | static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, | |
38 | uint8_t value) | |
39 | { | |
40 | lq_recv[*lq_index] = value; | |
41 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
42 | } | |
43 | ||
44 | /** | |
45 | * batadv_ring_buffer_set - compute the average of all non-zero values stored | |
46 | * in the given ring buffer | |
47 | * @lq_recv: pointer to the ring buffer | |
48 | * | |
49 | * Returns computed average value. | |
50 | */ | |
51 | static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) | |
52 | { | |
53 | const uint8_t *ptr; | |
54 | uint16_t count = 0, i = 0, sum = 0; | |
55 | ||
56 | ptr = lq_recv; | |
57 | ||
58 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
59 | if (*ptr != 0) { | |
60 | count++; | |
61 | sum += *ptr; | |
62 | } | |
63 | ||
64 | i++; | |
65 | ptr++; | |
66 | } | |
67 | ||
68 | if (count == 0) | |
69 | return 0; | |
70 | ||
71 | return (uint8_t)(sum / count); | |
72 | } | |
56303d34 SE |
73 | static struct batadv_neigh_node * |
74 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
75 | const uint8_t *neigh_addr, | |
76 | struct batadv_orig_node *orig_node, | |
863dd7a8 | 77 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 78 | { |
56303d34 | 79 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 80 | |
863dd7a8 | 81 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr); |
7ae8b285 ML |
82 | if (!neigh_node) |
83 | goto out; | |
84 | ||
85 | INIT_LIST_HEAD(&neigh_node->bonding_list); | |
7ae8b285 ML |
86 | |
87 | neigh_node->orig_node = orig_neigh; | |
88 | neigh_node->if_incoming = hard_iface; | |
89 | ||
90 | spin_lock_bh(&orig_node->neigh_list_lock); | |
91 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
92 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
93 | ||
94 | out: | |
95 | return neigh_node; | |
96 | } | |
97 | ||
56303d34 | 98 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 99 | { |
96412690 | 100 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 101 | unsigned char *ogm_buff; |
d7d32ec0 | 102 | uint32_t random_seqno; |
5346c35e | 103 | int res = -ENOMEM; |
d7d32ec0 ML |
104 | |
105 | /* randomize initial seqno to avoid collision */ | |
106 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 107 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 108 | |
14511519 ML |
109 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
110 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
111 | if (!ogm_buff) | |
77af7575 ML |
112 | goto out; |
113 | ||
14511519 ML |
114 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
115 | ||
116 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
96412690 SE |
117 | batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; |
118 | batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; | |
119 | batadv_ogm_packet->header.ttl = 2; | |
120 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; | |
121 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; | |
122 | batadv_ogm_packet->tt_num_changes = 0; | |
123 | batadv_ogm_packet->ttvn = 0; | |
77af7575 ML |
124 | |
125 | res = 0; | |
126 | ||
127 | out: | |
128 | return res; | |
d0b9fd89 ML |
129 | } |
130 | ||
56303d34 | 131 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 132 | { |
14511519 ML |
133 | kfree(hard_iface->bat_iv.ogm_buff); |
134 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
135 | } |
136 | ||
56303d34 | 137 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 138 | { |
96412690 | 139 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 140 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 141 | |
14511519 | 142 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 143 | memcpy(batadv_ogm_packet->orig, |
c3229398 | 144 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 145 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 146 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
147 | } |
148 | ||
56303d34 SE |
149 | static void |
150 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 151 | { |
96412690 | 152 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 153 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 154 | |
14511519 | 155 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 SE |
156 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
157 | batadv_ogm_packet->header.ttl = BATADV_TTL; | |
d0b9fd89 ML |
158 | } |
159 | ||
b9dacc52 | 160 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 161 | static unsigned long |
56303d34 | 162 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 163 | { |
42d0b044 SE |
164 | unsigned int msecs; |
165 | ||
166 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 167 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
168 | |
169 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
170 | } |
171 | ||
172 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 173 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 174 | { |
e76e4320 | 175 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
176 | } |
177 | ||
178 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
179 | static uint8_t batadv_hop_penalty(uint8_t tq, |
180 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
181 | { |
182 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
183 | int new_tq; |
184 | ||
185 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
186 | new_tq /= BATADV_TQ_MAX_VALUE; | |
187 | ||
188 | return new_tq; | |
b9dacc52 ML |
189 | } |
190 | ||
fc957275 | 191 | /* is there another aggregated packet here? */ |
fe8bc396 SE |
192 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
193 | int tt_num_changes) | |
fc957275 | 194 | { |
08c36d3e SE |
195 | int next_buff_pos = 0; |
196 | ||
7e071c79 | 197 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
08c36d3e | 198 | next_buff_pos += batadv_tt_len(tt_num_changes); |
fc957275 ML |
199 | |
200 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 201 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
202 | } |
203 | ||
b9dacc52 | 204 | /* send a batman ogm to a given interface */ |
56303d34 SE |
205 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
206 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 207 | { |
56303d34 | 208 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
209 | char *fwd_str; |
210 | uint8_t packet_num; | |
211 | int16_t buff_pos; | |
96412690 | 212 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 213 | struct sk_buff *skb; |
c67893d1 | 214 | uint8_t *packet_pos; |
b9dacc52 | 215 | |
e9a4f295 | 216 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
217 | return; |
218 | ||
219 | packet_num = 0; | |
220 | buff_pos = 0; | |
c67893d1 SE |
221 | packet_pos = forw_packet->skb->data; |
222 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
223 | |
224 | /* adjust all flags and log packets */ | |
fe8bc396 | 225 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
96412690 | 226 | batadv_ogm_packet->tt_num_changes)) { |
b9dacc52 | 227 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
228 | * ordinary base packet |
229 | */ | |
8de47de5 SE |
230 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
231 | forw_packet->if_incoming == hard_iface) | |
96412690 | 232 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 233 | else |
96412690 | 234 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 235 | |
c67893d1 SE |
236 | if (packet_num > 0 || !forw_packet->own) |
237 | fwd_str = "Forwarding"; | |
238 | else | |
239 | fwd_str = "Sending own"; | |
240 | ||
39c75a51 | 241 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
242 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
243 | fwd_str, (packet_num > 0 ? "aggregated " : ""), | |
96412690 SE |
244 | batadv_ogm_packet->orig, |
245 | ntohl(batadv_ogm_packet->seqno), | |
246 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, | |
247 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? | |
1eda58bf | 248 | "on" : "off"), |
96412690 | 249 | batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
1eda58bf | 250 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 251 | |
7e071c79 | 252 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 253 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
b9dacc52 | 254 | packet_num++; |
c67893d1 SE |
255 | packet_pos = forw_packet->skb->data + buff_pos; |
256 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
257 | } |
258 | ||
259 | /* create clone because function is called more than once */ | |
260 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 261 | if (skb) { |
d69909d2 SE |
262 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
263 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 264 | skb->len + ETH_HLEN); |
3193e8fd | 265 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 266 | } |
b9dacc52 ML |
267 | } |
268 | ||
269 | /* send a batman ogm packet */ | |
56303d34 | 270 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 271 | { |
56303d34 | 272 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 273 | struct net_device *soft_iface; |
56303d34 SE |
274 | struct batadv_priv *bat_priv; |
275 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 276 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 277 | unsigned char directlink; |
c67893d1 | 278 | uint8_t *packet_pos; |
b9dacc52 | 279 | |
c67893d1 SE |
280 | packet_pos = forw_packet->skb->data; |
281 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
96412690 | 282 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
283 | |
284 | if (!forw_packet->if_incoming) { | |
86ceb360 | 285 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
286 | goto out; |
287 | } | |
288 | ||
289 | soft_iface = forw_packet->if_incoming->soft_iface; | |
290 | bat_priv = netdev_priv(soft_iface); | |
291 | ||
e9a4f295 | 292 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
293 | goto out; |
294 | ||
e5d89254 | 295 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
296 | if (!primary_if) |
297 | goto out; | |
298 | ||
9cfc7bd6 SE |
299 | /* multihomed peer assumed |
300 | * non-primary OGMs are only broadcasted on their interface | |
301 | */ | |
96412690 | 302 | if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
b9dacc52 | 303 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
b9dacc52 | 304 | /* FIXME: what about aggregated packets ? */ |
39c75a51 | 305 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
306 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
307 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
308 | batadv_ogm_packet->orig, |
309 | ntohl(batadv_ogm_packet->seqno), | |
310 | batadv_ogm_packet->header.ttl, | |
1eda58bf SE |
311 | forw_packet->if_incoming->net_dev->name, |
312 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
313 | |
314 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
315 | batadv_send_skb_packet(forw_packet->skb, |
316 | forw_packet->if_incoming, | |
3193e8fd | 317 | batadv_broadcast_addr); |
b9dacc52 ML |
318 | forw_packet->skb = NULL; |
319 | ||
320 | goto out; | |
321 | } | |
322 | ||
323 | /* broadcast on every interface */ | |
324 | rcu_read_lock(); | |
3193e8fd | 325 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
326 | if (hard_iface->soft_iface != soft_iface) |
327 | continue; | |
328 | ||
fe8bc396 | 329 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
330 | } |
331 | rcu_read_unlock(); | |
332 | ||
333 | out: | |
334 | if (primary_if) | |
e5d89254 | 335 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
336 | } |
337 | ||
338 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 339 | static bool |
96412690 | 340 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 341 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
342 | int packet_len, unsigned long send_time, |
343 | bool directlink, | |
56303d34 SE |
344 | const struct batadv_hard_iface *if_incoming, |
345 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 346 | { |
96412690 | 347 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 348 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 349 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 350 | bool res = false; |
42d0b044 | 351 | unsigned long aggregation_end_time; |
b9dacc52 | 352 | |
96412690 | 353 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
354 | aggregation_end_time = send_time; |
355 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 356 | |
9cfc7bd6 | 357 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
358 | * if: |
359 | * | |
360 | * - the send time is within our MAX_AGGREGATION_MS time | |
361 | * - the resulting packet wont be bigger than | |
362 | * MAX_AGGREGATION_BYTES | |
363 | */ | |
b9dacc52 | 364 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
365 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
366 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
9cfc7bd6 | 367 | /* check aggregation compatibility |
b9dacc52 ML |
368 | * -> direct link packets are broadcasted on |
369 | * their interface only | |
370 | * -> aggregate packet if the current packet is | |
371 | * a "global" packet as well as the base | |
372 | * packet | |
373 | */ | |
e5d89254 | 374 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
375 | if (!primary_if) |
376 | goto out; | |
377 | ||
378 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
379 | * are flooded through the net |
380 | */ | |
b9dacc52 | 381 | if ((!directlink) && |
96412690 SE |
382 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
383 | (batadv_ogm_packet->header.ttl != 1) && | |
b9dacc52 ML |
384 | |
385 | /* own packets originating non-primary | |
9cfc7bd6 SE |
386 | * interfaces leave only that interface |
387 | */ | |
b9dacc52 ML |
388 | ((!forw_packet->own) || |
389 | (forw_packet->if_incoming == primary_if))) { | |
390 | res = true; | |
391 | goto out; | |
392 | } | |
393 | ||
394 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
395 | * interface only - we still can aggregate |
396 | */ | |
b9dacc52 | 397 | if ((directlink) && |
fe8bc396 | 398 | (new_bat_ogm_packet->header.ttl == 1) && |
b9dacc52 ML |
399 | (forw_packet->if_incoming == if_incoming) && |
400 | ||
401 | /* packets from direct neighbors or | |
402 | * own secondary interface packets | |
9cfc7bd6 SE |
403 | * (= secondary interface packets in general) |
404 | */ | |
96412690 | 405 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
406 | (forw_packet->own && |
407 | forw_packet->if_incoming != primary_if))) { | |
408 | res = true; | |
409 | goto out; | |
410 | } | |
411 | } | |
412 | ||
413 | out: | |
414 | if (primary_if) | |
e5d89254 | 415 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
416 | return res; |
417 | } | |
418 | ||
419 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
420 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
421 | int packet_len, unsigned long send_time, | |
422 | bool direct_link, | |
56303d34 | 423 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 424 | int own_packet) |
b9dacc52 | 425 | { |
56303d34 SE |
426 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
427 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 428 | unsigned char *skb_buff; |
42d0b044 | 429 | unsigned int skb_size; |
b9dacc52 ML |
430 | |
431 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
432 | return; | |
433 | ||
434 | /* own packet should always be scheduled */ | |
435 | if (!own_packet) { | |
3e34819e | 436 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 437 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 438 | "batman packet queue full\n"); |
b9dacc52 ML |
439 | goto out; |
440 | } | |
441 | } | |
442 | ||
443 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
444 | if (!forw_packet_aggr) { | |
445 | if (!own_packet) | |
446 | atomic_inc(&bat_priv->batman_queue_left); | |
447 | goto out; | |
448 | } | |
449 | ||
450 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 | 451 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
5b246574 | 452 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 453 | else |
5b246574 SE |
454 | skb_size = packet_len; |
455 | ||
41ab6c48 | 456 | skb_size += ETH_HLEN; |
b9dacc52 | 457 | |
41ab6c48 | 458 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
b9dacc52 ML |
459 | if (!forw_packet_aggr->skb) { |
460 | if (!own_packet) | |
461 | atomic_inc(&bat_priv->batman_queue_left); | |
462 | kfree(forw_packet_aggr); | |
463 | goto out; | |
464 | } | |
41ab6c48 | 465 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 466 | |
b9dacc52 ML |
467 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
468 | forw_packet_aggr->packet_len = packet_len; | |
469 | memcpy(skb_buff, packet_buff, packet_len); | |
470 | ||
471 | forw_packet_aggr->own = own_packet; | |
472 | forw_packet_aggr->if_incoming = if_incoming; | |
473 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 474 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
475 | forw_packet_aggr->send_time = send_time; |
476 | ||
477 | /* save packet direct link flag status */ | |
478 | if (direct_link) | |
479 | forw_packet_aggr->direct_link_flags |= 1; | |
480 | ||
481 | /* add new packet to packet list */ | |
482 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
483 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
484 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
485 | ||
486 | /* start timer for this packet */ | |
487 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 488 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 489 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
490 | &forw_packet_aggr->delayed_work, |
491 | send_time - jiffies); | |
492 | ||
493 | return; | |
494 | out: | |
e5d89254 | 495 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
496 | } |
497 | ||
498 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 499 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
500 | const unsigned char *packet_buff, |
501 | int packet_len, bool direct_link) | |
b9dacc52 ML |
502 | { |
503 | unsigned char *skb_buff; | |
8de47de5 | 504 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
505 | |
506 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
507 | memcpy(skb_buff, packet_buff, packet_len); | |
508 | forw_packet_aggr->packet_len += packet_len; | |
509 | forw_packet_aggr->num_packets++; | |
510 | ||
511 | /* save packet direct link flag status */ | |
8de47de5 SE |
512 | if (direct_link) { |
513 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
514 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
515 | } | |
b9dacc52 ML |
516 | } |
517 | ||
56303d34 | 518 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
519 | unsigned char *packet_buff, |
520 | int packet_len, | |
56303d34 | 521 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 522 | int own_packet, unsigned long send_time) |
b9dacc52 | 523 | { |
9cfc7bd6 | 524 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
525 | * _pos -> pointer to the position in the queue |
526 | */ | |
56303d34 SE |
527 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
528 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 529 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 530 | bool direct_link; |
42d0b044 | 531 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 532 | |
96412690 SE |
533 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
534 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 535 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
536 | |
537 | /* find position for the packet in the forward queue */ | |
538 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
539 | /* own packets are not to be aggregated */ | |
540 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
b67bfe0d | 541 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 542 | &bat_priv->forw_bat_list, list) { |
96412690 | 543 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
544 | bat_priv, packet_len, |
545 | send_time, direct_link, | |
546 | if_incoming, | |
547 | forw_packet_pos)) { | |
b9dacc52 ML |
548 | forw_packet_aggr = forw_packet_pos; |
549 | break; | |
550 | } | |
551 | } | |
552 | } | |
553 | ||
554 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
555 | * suitable aggregation packet found |
556 | */ | |
b9dacc52 ML |
557 | if (!forw_packet_aggr) { |
558 | /* the following section can run without the lock */ | |
559 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
560 | ||
9cfc7bd6 | 561 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
562 | * we hold it back for a while, so that it might be aggregated |
563 | * later on | |
564 | */ | |
42d0b044 SE |
565 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
566 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 567 | |
fe8bc396 SE |
568 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
569 | send_time, direct_link, | |
570 | if_incoming, own_packet); | |
b9dacc52 | 571 | } else { |
fe8bc396 SE |
572 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
573 | packet_len, direct_link); | |
b9dacc52 ML |
574 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
575 | } | |
576 | } | |
577 | ||
56303d34 | 578 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 579 | const struct ethhdr *ethhdr, |
96412690 | 580 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
581 | bool is_single_hop_neigh, |
582 | bool is_from_best_next_hop, | |
56303d34 | 583 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 584 | { |
56303d34 | 585 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
b9dacc52 ML |
586 | uint8_t tt_num_changes; |
587 | ||
96412690 | 588 | if (batadv_ogm_packet->header.ttl <= 1) { |
39c75a51 | 589 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
590 | return; |
591 | } | |
592 | ||
13b2541b ML |
593 | if (!is_from_best_next_hop) { |
594 | /* Mark the forwarded packet when it is not coming from our | |
595 | * best next hop. We still need to forward the packet for our | |
596 | * neighbor link quality detection to work in case the packet | |
597 | * originated from a single hop neighbor. Otherwise we can | |
598 | * simply drop the ogm. | |
599 | */ | |
600 | if (is_single_hop_neigh) | |
96412690 | 601 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
602 | else |
603 | return; | |
604 | } | |
b9dacc52 | 605 | |
96412690 | 606 | tt_num_changes = batadv_ogm_packet->tt_num_changes; |
b9dacc52 | 607 | |
96412690 SE |
608 | batadv_ogm_packet->header.ttl--; |
609 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); | |
b9dacc52 | 610 | |
b9dacc52 | 611 | /* apply hop penalty */ |
96412690 | 612 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 613 | bat_priv); |
b9dacc52 | 614 | |
39c75a51 | 615 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 616 | "Forwarding packet: tq: %i, ttl: %i\n", |
96412690 | 617 | batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
b9dacc52 | 618 | |
b9dacc52 | 619 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 620 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 621 | if (is_single_hop_neigh) |
96412690 | 622 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 623 | else |
96412690 | 624 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 625 | |
96412690 | 626 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
7e071c79 | 627 | BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
fe8bc396 | 628 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
629 | } |
630 | ||
d9896617 AQ |
631 | /** |
632 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
633 | * the given interface | |
634 | * @hard_iface: the interface for which the windows have to be shifted | |
635 | */ | |
636 | static void | |
637 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
638 | { | |
639 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
640 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
641 | struct hlist_head *head; | |
642 | struct batadv_orig_node *orig_node; | |
643 | unsigned long *word; | |
644 | uint32_t i; | |
645 | size_t word_index; | |
646 | uint8_t *w; | |
647 | ||
648 | for (i = 0; i < hash->size; i++) { | |
649 | head = &hash->table[i]; | |
650 | ||
651 | rcu_read_lock(); | |
652 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
653 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
654 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; | |
655 | word = &(orig_node->bcast_own[word_index]); | |
656 | ||
657 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
658 | w = &orig_node->bcast_own_sum[hard_iface->if_num]; | |
659 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); | |
660 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
661 | } | |
662 | rcu_read_unlock(); | |
663 | } | |
664 | } | |
665 | ||
56303d34 | 666 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 667 | { |
56303d34 | 668 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 669 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 670 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 671 | struct batadv_hard_iface *primary_if; |
14511519 | 672 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
be9aa4c1 | 673 | int vis_server, tt_num_changes = 0; |
bbb1f90e SE |
674 | uint32_t seqno; |
675 | uint8_t bandwidth; | |
b9dacc52 ML |
676 | |
677 | vis_server = atomic_read(&bat_priv->vis_mode); | |
e5d89254 | 678 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 679 | |
be9aa4c1 | 680 | if (hard_iface == primary_if) |
14511519 ML |
681 | tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, |
682 | ogm_buff_len, | |
7e071c79 | 683 | BATADV_OGM_HLEN); |
be9aa4c1 | 684 | |
14511519 | 685 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
b9dacc52 ML |
686 | |
687 | /* change sequence number to network order */ | |
14511519 | 688 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 689 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 690 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 691 | |
807736f6 SE |
692 | batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
693 | batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); | |
b9dacc52 | 694 | if (tt_num_changes >= 0) |
96412690 | 695 | batadv_ogm_packet->tt_num_changes = tt_num_changes; |
b9dacc52 | 696 | |
acd34afa | 697 | if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
96412690 | 698 | batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
b9dacc52 | 699 | else |
96412690 | 700 | batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
b9dacc52 | 701 | |
bbb1f90e SE |
702 | if (hard_iface == primary_if && |
703 | atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { | |
704 | bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); | |
705 | batadv_ogm_packet->gw_flags = bandwidth; | |
706 | } else { | |
96412690 | 707 | batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
bbb1f90e | 708 | } |
b9dacc52 | 709 | |
d9896617 | 710 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
14511519 ML |
711 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
712 | hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, | |
fe8bc396 | 713 | batadv_iv_ogm_emit_send_time(bat_priv)); |
b9dacc52 ML |
714 | |
715 | if (primary_if) | |
e5d89254 | 716 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
717 | } |
718 | ||
fe8bc396 | 719 | static void |
56303d34 SE |
720 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
721 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 722 | const struct ethhdr *ethhdr, |
96412690 | 723 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 724 | struct batadv_hard_iface *if_incoming, |
fe8bc396 SE |
725 | const unsigned char *tt_buff, |
726 | int is_duplicate) | |
fc957275 | 727 | { |
56303d34 SE |
728 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
729 | struct batadv_neigh_node *router = NULL; | |
730 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 731 | int if_num; |
bbb1f90e | 732 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 733 | uint8_t *neigh_addr; |
bbb1f90e | 734 | uint8_t tq_avg; |
fc957275 | 735 | |
39c75a51 | 736 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 737 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
738 | |
739 | rcu_read_lock(); | |
b67bfe0d | 740 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 741 | &orig_node->neigh_list, list) { |
1eda58bf SE |
742 | neigh_addr = tmp_neigh_node->addr; |
743 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
744 | tmp_neigh_node->if_incoming == if_incoming && | |
745 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
38dc40ef | 746 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
7d211efc | 747 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
748 | neigh_node = tmp_neigh_node; |
749 | continue; | |
750 | } | |
751 | ||
752 | if (is_duplicate) | |
753 | continue; | |
754 | ||
e3b0d0de | 755 | spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
925a6672 SE |
756 | batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
757 | &tmp_neigh_node->tq_index, 0); | |
bbb1f90e SE |
758 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
759 | tmp_neigh_node->tq_avg = tq_avg; | |
e3b0d0de | 760 | spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
fc957275 ML |
761 | } |
762 | ||
763 | if (!neigh_node) { | |
56303d34 | 764 | struct batadv_orig_node *orig_tmp; |
fc957275 | 765 | |
7d211efc | 766 | orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
fc957275 ML |
767 | if (!orig_tmp) |
768 | goto unlock; | |
769 | ||
fe8bc396 SE |
770 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
771 | ethhdr->h_source, | |
863dd7a8 | 772 | orig_node, orig_tmp); |
fc957275 | 773 | |
7d211efc | 774 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
775 | if (!neigh_node) |
776 | goto unlock; | |
777 | } else | |
39c75a51 | 778 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 779 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
780 | |
781 | rcu_read_unlock(); | |
782 | ||
96412690 | 783 | orig_node->flags = batadv_ogm_packet->flags; |
d7b2a97e | 784 | neigh_node->last_seen = jiffies; |
fc957275 | 785 | |
e3b0d0de | 786 | spin_lock_bh(&neigh_node->lq_update_lock); |
925a6672 SE |
787 | batadv_ring_buffer_set(neigh_node->tq_recv, |
788 | &neigh_node->tq_index, | |
96412690 | 789 | batadv_ogm_packet->tq); |
925a6672 | 790 | neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
e3b0d0de | 791 | spin_unlock_bh(&neigh_node->lq_update_lock); |
fc957275 ML |
792 | |
793 | if (!is_duplicate) { | |
96412690 SE |
794 | orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
795 | neigh_node->last_ttl = batadv_ogm_packet->header.ttl; | |
fc957275 ML |
796 | } |
797 | ||
30d3c511 | 798 | batadv_bonding_candidate_add(orig_node, neigh_node); |
fc957275 ML |
799 | |
800 | /* if this neighbor already is our next hop there is nothing | |
9cfc7bd6 SE |
801 | * to change |
802 | */ | |
7d211efc | 803 | router = batadv_orig_node_get_router(orig_node); |
fc957275 ML |
804 | if (router == neigh_node) |
805 | goto update_tt; | |
806 | ||
807 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
808 | if (router && (router->tq_avg > neigh_node->tq_avg)) | |
809 | goto update_tt; | |
810 | ||
811 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
812 | * won't consider it either |
813 | */ | |
fc957275 ML |
814 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
815 | orig_node_tmp = router->orig_node; | |
816 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
817 | if_num = router->if_incoming->if_num; |
818 | sum_orig = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
819 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
820 | ||
821 | orig_node_tmp = neigh_node->orig_node; | |
822 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
7caf69fb LL |
823 | if_num = neigh_node->if_incoming->if_num; |
824 | sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; | |
fc957275 ML |
825 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
826 | ||
bbb1f90e | 827 | if (sum_orig >= sum_neigh) |
fc957275 ML |
828 | goto update_tt; |
829 | } | |
830 | ||
30d3c511 | 831 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
832 | |
833 | update_tt: | |
834 | /* I have to check for transtable changes only if the OGM has been | |
9cfc7bd6 SE |
835 | * sent through a primary interface |
836 | */ | |
96412690 SE |
837 | if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
838 | (batadv_ogm_packet->header.ttl > 2)) || | |
839 | (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) | |
08c36d3e | 840 | batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
96412690 SE |
841 | batadv_ogm_packet->tt_num_changes, |
842 | batadv_ogm_packet->ttvn, | |
843 | ntohs(batadv_ogm_packet->tt_crc)); | |
fc957275 | 844 | |
96412690 | 845 | if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
7cf06bc6 | 846 | batadv_gw_node_update(bat_priv, orig_node, |
96412690 | 847 | batadv_ogm_packet->gw_flags); |
fc957275 | 848 | |
96412690 | 849 | orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
fc957275 ML |
850 | |
851 | /* restart gateway selection if fast or late switching was enabled */ | |
852 | if ((orig_node->gw_flags) && | |
cd646ab1 | 853 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
fc957275 | 854 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
7cf06bc6 | 855 | batadv_gw_check_election(bat_priv, orig_node); |
fc957275 ML |
856 | |
857 | goto out; | |
858 | ||
859 | unlock: | |
860 | rcu_read_unlock(); | |
861 | out: | |
862 | if (neigh_node) | |
7d211efc | 863 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 864 | if (router) |
7d211efc | 865 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
866 | } |
867 | ||
56303d34 SE |
868 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
869 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 870 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 871 | struct batadv_hard_iface *if_incoming) |
fc957275 | 872 | { |
56303d34 SE |
873 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
874 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 | 875 | uint8_t total_count; |
42d0b044 SE |
876 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
877 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
878 | int tq_asym_penalty, inv_asym_penalty, ret = 0; | |
879 | unsigned int combined_tq; | |
fc957275 ML |
880 | |
881 | /* find corresponding one hop neighbor */ | |
882 | rcu_read_lock(); | |
b67bfe0d | 883 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 884 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
885 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
886 | orig_neigh_node->orig)) | |
fc957275 ML |
887 | continue; |
888 | ||
889 | if (tmp_neigh_node->if_incoming != if_incoming) | |
890 | continue; | |
891 | ||
892 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
893 | continue; | |
894 | ||
895 | neigh_node = tmp_neigh_node; | |
896 | break; | |
897 | } | |
898 | rcu_read_unlock(); | |
899 | ||
900 | if (!neigh_node) | |
fe8bc396 SE |
901 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
902 | orig_neigh_node->orig, | |
903 | orig_neigh_node, | |
863dd7a8 | 904 | orig_neigh_node); |
fc957275 ML |
905 | |
906 | if (!neigh_node) | |
907 | goto out; | |
908 | ||
d7b2a97e | 909 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 910 | if (orig_node == orig_neigh_node) |
d7b2a97e | 911 | neigh_node->last_seen = jiffies; |
fc957275 | 912 | |
d7b2a97e | 913 | orig_node->last_seen = jiffies; |
fc957275 ML |
914 | |
915 | /* find packet count of corresponding one hop neighbor */ | |
916 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
917 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
918 | neigh_rq_count = neigh_node->real_packet_count; | |
919 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
920 | ||
921 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
922 | if (orig_eq_count > neigh_rq_count) |
923 | total_count = neigh_rq_count; | |
924 | else | |
925 | total_count = orig_eq_count; | |
fc957275 | 926 | |
9cfc7bd6 SE |
927 | /* if we have too few packets (too less data) we set tq_own to zero |
928 | * if we receive too few packets it is not considered bidirectional | |
929 | */ | |
42d0b044 SE |
930 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
931 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
932 | tq_own = 0; |
933 | else | |
934 | /* neigh_node->real_packet_count is never zero as we | |
935 | * only purge old information when getting new | |
9cfc7bd6 SE |
936 | * information |
937 | */ | |
42d0b044 | 938 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 939 | |
21a1236b | 940 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
941 | * affect the nearly-symmetric links only a little, but |
942 | * punishes asymmetric links more. This will give a value | |
943 | * between 0 and TQ_MAX_VALUE | |
944 | */ | |
42d0b044 SE |
945 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
946 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
947 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
948 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
949 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
950 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
951 | inv_asym_penalty /= neigh_rq_max_cube; | |
952 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
953 | ||
96412690 | 954 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 955 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 956 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 957 | |
39c75a51 | 958 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
959 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
960 | orig_node->orig, orig_neigh_node->orig, total_count, | |
961 | neigh_rq_count, tq_own, | |
96412690 | 962 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
963 | |
964 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
965 | * consider it bidirectional |
966 | */ | |
96412690 | 967 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
968 | ret = 1; |
969 | ||
970 | out: | |
971 | if (neigh_node) | |
7d211efc | 972 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
973 | return ret; |
974 | } | |
975 | ||
976 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
977 | * finds out whether it is a duplicate. | |
978 | * returns: | |
979 | * 1 the packet is a duplicate | |
980 | * 0 the packet has not yet been received | |
981 | * -1 the packet is old and has been received while the seqno window | |
982 | * was protected. Caller should drop it. | |
983 | */ | |
fe8bc396 SE |
984 | static int |
985 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, | |
96412690 | 986 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 987 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 988 | { |
56303d34 SE |
989 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
990 | struct batadv_orig_node *orig_node; | |
991 | struct batadv_neigh_node *tmp_neigh_node; | |
fc957275 ML |
992 | int is_duplicate = 0; |
993 | int32_t seq_diff; | |
994 | int need_update = 0; | |
995 | int set_mark, ret = -1; | |
96412690 | 996 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 997 | uint8_t *neigh_addr; |
bbb1f90e | 998 | uint8_t packet_count; |
fc957275 | 999 | |
96412690 | 1000 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1001 | if (!orig_node) |
1002 | return 0; | |
1003 | ||
1004 | spin_lock_bh(&orig_node->ogm_cnt_lock); | |
e0f5211f | 1005 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
1006 | |
1007 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1008 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 SE |
1009 | batadv_window_protected(bat_priv, seq_diff, |
1010 | &orig_node->batman_seqno_reset)) | |
fc957275 ML |
1011 | goto out; |
1012 | ||
1013 | rcu_read_lock(); | |
b67bfe0d | 1014 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1015 | &orig_node->neigh_list, list) { |
9b4a1159 SE |
1016 | is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
1017 | orig_node->last_real_seqno, | |
1018 | seqno); | |
fc957275 | 1019 | |
1eda58bf SE |
1020 | neigh_addr = tmp_neigh_node->addr; |
1021 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
1022 | tmp_neigh_node->if_incoming == if_incoming) | |
fc957275 ML |
1023 | set_mark = 1; |
1024 | else | |
1025 | set_mark = 0; | |
1026 | ||
1027 | /* if the window moved, set the update flag. */ | |
0f5f9322 SE |
1028 | need_update |= batadv_bit_get_packet(bat_priv, |
1029 | tmp_neigh_node->real_bits, | |
1030 | seq_diff, set_mark); | |
fc957275 | 1031 | |
bbb1f90e SE |
1032 | packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
1033 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
1034 | tmp_neigh_node->real_packet_count = packet_count; | |
fc957275 ML |
1035 | } |
1036 | rcu_read_unlock(); | |
1037 | ||
1038 | if (need_update) { | |
39c75a51 | 1039 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1040 | "updating last_seqno: old %u, new %u\n", |
1041 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 1042 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
1043 | } |
1044 | ||
1045 | ret = is_duplicate; | |
1046 | ||
1047 | out: | |
1048 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7d211efc | 1049 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1050 | return ret; |
1051 | } | |
1052 | ||
fe8bc396 | 1053 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 1054 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 1055 | const unsigned char *tt_buff, |
56303d34 | 1056 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1057 | { |
56303d34 SE |
1058 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1059 | struct batadv_hard_iface *hard_iface; | |
1060 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
1061 | struct batadv_neigh_node *router = NULL, *router_router = NULL; | |
1062 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
1063 | int has_directlink_flag; |
1064 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
281581d3 | 1065 | int is_bidirect; |
75cd33f8 | 1066 | bool is_single_hop_neigh = false; |
13b2541b | 1067 | bool is_from_best_next_hop = false; |
fe8bc396 | 1068 | int is_duplicate, sameseq, simlar_ttl; |
fc957275 | 1069 | uint32_t if_incoming_seqno; |
1eda58bf | 1070 | uint8_t *prev_sender; |
fc957275 ML |
1071 | |
1072 | /* Silently drop when the batman packet is actually not a | |
1073 | * correct packet. | |
1074 | * | |
1075 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1076 | * minimum frame length of 64 byte) and the aggregation interprets | |
1077 | * it as an additional length. | |
1078 | * | |
1079 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1080 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1081 | * packet in an aggregation. Here we expect that the padding |
1082 | * is always zero (or not 0x01) | |
1083 | */ | |
96412690 | 1084 | if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
fc957275 ML |
1085 | return; |
1086 | ||
1087 | /* could be changed by schedule_own_packet() */ | |
14511519 | 1088 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
fc957275 | 1089 | |
96412690 | 1090 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1091 | has_directlink_flag = 1; |
1092 | else | |
1093 | has_directlink_flag = 0; | |
fc957275 | 1094 | |
96412690 | 1095 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1096 | is_single_hop_neigh = true; |
fc957275 | 1097 | |
39c75a51 | 1098 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0275e24 | 1099 | "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 | 1100 | ethhdr->h_source, if_incoming->net_dev->name, |
96412690 SE |
1101 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1102 | batadv_ogm_packet->prev_sender, | |
1103 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, | |
1104 | ntohs(batadv_ogm_packet->tt_crc), | |
1105 | batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, | |
1106 | batadv_ogm_packet->header.ttl, | |
1107 | batadv_ogm_packet->header.version, has_directlink_flag); | |
fc957275 ML |
1108 | |
1109 | rcu_read_lock(); | |
3193e8fd | 1110 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1111 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1112 | continue; |
1113 | ||
1114 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1115 | continue; | |
1116 | ||
1eda58bf SE |
1117 | if (batadv_compare_eth(ethhdr->h_source, |
1118 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1119 | is_my_addr = 1; |
1120 | ||
96412690 | 1121 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1122 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1123 | is_my_orig = 1; |
1124 | ||
96412690 | 1125 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1126 | hard_iface->net_dev->dev_addr)) |
fc957275 | 1127 | is_my_oldorig = 1; |
fc957275 ML |
1128 | } |
1129 | rcu_read_unlock(); | |
1130 | ||
fc957275 | 1131 | if (is_my_addr) { |
39c75a51 | 1132 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1133 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1134 | ethhdr->h_source); | |
fc957275 ML |
1135 | return; |
1136 | } | |
1137 | ||
fc957275 ML |
1138 | if (is_my_orig) { |
1139 | unsigned long *word; | |
1140 | int offset; | |
9b4a1159 | 1141 | int32_t bit_pos; |
42d0b044 SE |
1142 | int16_t if_num; |
1143 | uint8_t *weight; | |
fc957275 | 1144 | |
7d211efc SE |
1145 | orig_neigh_node = batadv_get_orig_node(bat_priv, |
1146 | ethhdr->h_source); | |
fc957275 ML |
1147 | if (!orig_neigh_node) |
1148 | return; | |
1149 | ||
1150 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1151 | * come via the corresponding interface |
1152 | * save packet seqno for bidirectional check | |
1153 | */ | |
fc957275 | 1154 | if (has_directlink_flag && |
1eda58bf | 1155 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1156 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1157 | if_num = if_incoming->if_num; |
1158 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 ML |
1159 | |
1160 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
1161 | word = &(orig_neigh_node->bcast_own[offset]); | |
9b4a1159 | 1162 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1163 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1164 | batadv_set_bit(word, bit_pos); |
42d0b044 SE |
1165 | weight = &orig_neigh_node->bcast_own_sum[if_num]; |
1166 | *weight = bitmap_weight(word, | |
1167 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
fc957275 ML |
1168 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
1169 | } | |
1170 | ||
39c75a51 | 1171 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1172 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1173 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1174 | return; |
1175 | } | |
1176 | ||
1177 | if (is_my_oldorig) { | |
39c75a51 | 1178 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1179 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1180 | ethhdr->h_source); | |
fc957275 ML |
1181 | return; |
1182 | } | |
1183 | ||
96412690 | 1184 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1185 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1186 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1187 | ethhdr->h_source); | |
13b2541b ML |
1188 | return; |
1189 | } | |
1190 | ||
96412690 | 1191 | orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1192 | if (!orig_node) |
1193 | return; | |
1194 | ||
96412690 | 1195 | is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
fe8bc396 | 1196 | if_incoming); |
fc957275 ML |
1197 | |
1198 | if (is_duplicate == -1) { | |
39c75a51 | 1199 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1200 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1201 | ethhdr->h_source); | |
fc957275 ML |
1202 | goto out; |
1203 | } | |
1204 | ||
96412690 | 1205 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1206 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1207 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1208 | goto out; |
1209 | } | |
1210 | ||
7d211efc | 1211 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 1212 | if (router) |
7d211efc | 1213 | router_router = batadv_orig_node_get_router(router->orig_node); |
fc957275 | 1214 | |
13b2541b | 1215 | if ((router && router->tq_avg != 0) && |
1eda58bf | 1216 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1217 | is_from_best_next_hop = true; |
1218 | ||
96412690 | 1219 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1220 | /* avoid temporary routing loops */ |
1221 | if (router && router_router && | |
1eda58bf | 1222 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1223 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1224 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1225 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1226 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1227 | ethhdr->h_source); | |
fc957275 ML |
1228 | goto out; |
1229 | } | |
1230 | ||
1231 | /* if sender is a direct neighbor the sender mac equals | |
9cfc7bd6 SE |
1232 | * originator mac |
1233 | */ | |
c67893d1 SE |
1234 | if (is_single_hop_neigh) |
1235 | orig_neigh_node = orig_node; | |
1236 | else | |
1237 | orig_neigh_node = batadv_get_orig_node(bat_priv, | |
1238 | ethhdr->h_source); | |
1239 | ||
fc957275 ML |
1240 | if (!orig_neigh_node) |
1241 | goto out; | |
1242 | ||
d56b1705 MH |
1243 | /* Update nc_nodes of the originator */ |
1244 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
1245 | batadv_ogm_packet, is_single_hop_neigh); | |
1246 | ||
7d211efc | 1247 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1248 | |
1249 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1250 | * don't route towards it |
1251 | */ | |
fc957275 | 1252 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1253 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1254 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1255 | goto out_neigh; |
1256 | } | |
1257 | ||
fe8bc396 | 1258 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1259 | batadv_ogm_packet, if_incoming); |
fc957275 | 1260 | |
30d3c511 | 1261 | batadv_bonding_save_primary(orig_node, orig_neigh_node, |
96412690 | 1262 | batadv_ogm_packet); |
fc957275 ML |
1263 | |
1264 | /* update ranking if it is not a duplicate or has the same | |
9cfc7bd6 SE |
1265 | * seqno and similar ttl as the non-duplicate |
1266 | */ | |
96412690 SE |
1267 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
1268 | simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; | |
fe8bc396 SE |
1269 | if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
1270 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, | |
96412690 | 1271 | batadv_ogm_packet, if_incoming, |
fe8bc396 | 1272 | tt_buff, is_duplicate); |
fc957275 ML |
1273 | |
1274 | /* is single hop (direct) neighbor */ | |
1275 | if (is_single_hop_neigh) { | |
fc957275 | 1276 | /* mark direct link on incoming interface */ |
96412690 | 1277 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1278 | is_single_hop_neigh, |
1279 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1280 | |
39c75a51 | 1281 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1282 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1283 | goto out_neigh; |
1284 | } | |
1285 | ||
1286 | /* multihop originator */ | |
fe8bc396 | 1287 | if (!is_bidirect) { |
39c75a51 | 1288 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1289 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1290 | goto out_neigh; |
1291 | } | |
1292 | ||
1293 | if (is_duplicate) { | |
39c75a51 | 1294 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1295 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1296 | goto out_neigh; |
1297 | } | |
1298 | ||
39c75a51 | 1299 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1300 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1301 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1302 | is_single_hop_neigh, is_from_best_next_hop, |
1303 | if_incoming); | |
fc957275 ML |
1304 | |
1305 | out_neigh: | |
1306 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1307 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1308 | out: |
1309 | if (router) | |
7d211efc | 1310 | batadv_neigh_node_free_ref(router); |
fc957275 | 1311 | if (router_router) |
7d211efc | 1312 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1313 | if (orig_neigh_router) |
7d211efc | 1314 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1315 | |
7d211efc | 1316 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1317 | } |
1318 | ||
fe8bc396 | 1319 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1320 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1321 | { |
56303d34 | 1322 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1323 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1324 | struct ethhdr *ethhdr; |
1325 | int buff_pos = 0, packet_len; | |
1326 | unsigned char *tt_buff, *packet_buff; | |
c3e29312 | 1327 | bool ret; |
c67893d1 | 1328 | uint8_t *packet_pos; |
c3e29312 | 1329 | |
7e071c79 | 1330 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1331 | if (!ret) |
1332 | return NET_RX_DROP; | |
fc957275 | 1333 | |
edbf12ba ML |
1334 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1335 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1336 | */ | |
fe8bc396 | 1337 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1338 | return NET_RX_DROP; |
1339 | ||
d69909d2 SE |
1340 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1341 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1342 | skb->len + ETH_HLEN); |
1343 | ||
8780dad9 | 1344 | packet_len = skb_headlen(skb); |
7ed4be95 | 1345 | ethhdr = eth_hdr(skb); |
8780dad9 | 1346 | packet_buff = skb->data; |
96412690 | 1347 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1348 | |
1349 | /* unpack the aggregated packets and process them one by one */ | |
b47506d9 ML |
1350 | while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
1351 | batadv_ogm_packet->tt_num_changes)) { | |
7e071c79 | 1352 | tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
fc957275 | 1353 | |
96412690 | 1354 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
fe8bc396 | 1355 | if_incoming); |
fc957275 | 1356 | |
7e071c79 | 1357 | buff_pos += BATADV_OGM_HLEN; |
96412690 | 1358 | buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
fc957275 | 1359 | |
c67893d1 SE |
1360 | packet_pos = packet_buff + buff_pos; |
1361 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1362 | } |
c3e29312 ML |
1363 | |
1364 | kfree_skb(skb); | |
1365 | return NET_RX_SUCCESS; | |
fc957275 | 1366 | } |
1c280471 | 1367 | |
56303d34 | 1368 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1369 | .name = "BATMAN_IV", |
fe8bc396 SE |
1370 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1371 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1372 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1373 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1374 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1375 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
1c280471 ML |
1376 | }; |
1377 | ||
81c524f7 | 1378 | int __init batadv_iv_init(void) |
1c280471 | 1379 | { |
c3e29312 ML |
1380 | int ret; |
1381 | ||
1382 | /* batman originator packet */ | |
acd34afa SE |
1383 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1384 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1385 | if (ret < 0) |
1386 | goto out; | |
1387 | ||
fe8bc396 | 1388 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1389 | if (ret < 0) |
1390 | goto handler_unregister; | |
1391 | ||
1392 | goto out; | |
1393 | ||
1394 | handler_unregister: | |
acd34afa | 1395 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1396 | out: |
1397 | return ret; | |
1c280471 | 1398 | } |