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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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
fc957275 ML |
16 | */ |
17 | ||
18 | #include "main.h" | |
fc957275 | 19 | #include "translation-table.h" |
fc957275 ML |
20 | #include "originator.h" |
21 | #include "routing.h" | |
22 | #include "gateway_common.h" | |
23 | #include "gateway_client.h" | |
24 | #include "hard-interface.h" | |
25 | #include "send.h" | |
1c280471 | 26 | #include "bat_algo.h" |
d56b1705 | 27 | #include "network-coding.h" |
fc957275 | 28 | |
791c2a2d AQ |
29 | |
30 | /** | |
31 | * batadv_dup_status - duplicate status | |
32 | * @BATADV_NO_DUP: the packet is a duplicate | |
33 | * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the | |
34 | * neighbor) | |
35 | * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor | |
36 | * @BATADV_PROTECTED: originator is currently protected (after reboot) | |
37 | */ | |
38 | enum batadv_dup_status { | |
39 | BATADV_NO_DUP = 0, | |
40 | BATADV_ORIG_DUP, | |
41 | BATADV_NEIGH_DUP, | |
42 | BATADV_PROTECTED, | |
43 | }; | |
44 | ||
24a5deeb AQ |
45 | /** |
46 | * batadv_ring_buffer_set - update the ring buffer with the given value | |
47 | * @lq_recv: pointer to the ring buffer | |
48 | * @lq_index: index to store the value at | |
49 | * @value: value to store in the ring buffer | |
50 | */ | |
51 | static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, | |
52 | uint8_t value) | |
53 | { | |
54 | lq_recv[*lq_index] = value; | |
55 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
56 | } | |
57 | ||
58 | /** | |
59 | * batadv_ring_buffer_set - compute the average of all non-zero values stored | |
60 | * in the given ring buffer | |
61 | * @lq_recv: pointer to the ring buffer | |
62 | * | |
63 | * Returns computed average value. | |
64 | */ | |
65 | static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) | |
66 | { | |
67 | const uint8_t *ptr; | |
68 | uint16_t count = 0, i = 0, sum = 0; | |
69 | ||
70 | ptr = lq_recv; | |
71 | ||
72 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
73 | if (*ptr != 0) { | |
74 | count++; | |
75 | sum += *ptr; | |
76 | } | |
77 | ||
78 | i++; | |
79 | ptr++; | |
80 | } | |
81 | ||
82 | if (count == 0) | |
83 | return 0; | |
84 | ||
85 | return (uint8_t)(sum / count); | |
86 | } | |
d98cae64 | 87 | |
d0015fdd AQ |
88 | /** |
89 | * batadv_iv_ogm_orig_free - free the private resources allocated for this | |
90 | * orig_node | |
91 | * @orig_node: the orig_node for which the resources have to be free'd | |
92 | */ | |
93 | static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) | |
94 | { | |
95 | kfree(orig_node->bat_iv.bcast_own); | |
96 | kfree(orig_node->bat_iv.bcast_own_sum); | |
97 | } | |
98 | ||
99 | /** | |
100 | * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to | |
101 | * include the new hard-interface | |
102 | * @orig_node: the orig_node that has to be changed | |
103 | * @max_if_num: the current amount of interfaces | |
104 | * | |
105 | * Returns 0 on success, a negative error code otherwise. | |
106 | */ | |
107 | static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, | |
108 | int max_if_num) | |
109 | { | |
110 | void *data_ptr; | |
111 | size_t data_size, old_size; | |
112 | int ret = -ENOMEM; | |
113 | ||
114 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
115 | ||
116 | data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
117 | old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
118 | data_ptr = kmalloc(data_size, GFP_ATOMIC); | |
119 | if (!data_ptr) | |
120 | goto unlock; | |
121 | ||
122 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); | |
123 | kfree(orig_node->bat_iv.bcast_own); | |
124 | orig_node->bat_iv.bcast_own = data_ptr; | |
125 | ||
126 | data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); | |
127 | if (!data_ptr) { | |
128 | kfree(orig_node->bat_iv.bcast_own); | |
129 | goto unlock; | |
130 | } | |
131 | ||
132 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
133 | (max_if_num - 1) * sizeof(uint8_t)); | |
134 | kfree(orig_node->bat_iv.bcast_own_sum); | |
135 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
136 | ||
137 | ret = 0; | |
138 | ||
139 | unlock: | |
140 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
141 | ||
142 | return ret; | |
143 | } | |
144 | ||
145 | /** | |
146 | * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to | |
147 | * exclude the removed interface | |
148 | * @orig_node: the orig_node that has to be changed | |
149 | * @max_if_num: the current amount of interfaces | |
150 | * @del_if_num: the index of the interface being removed | |
151 | * | |
152 | * Returns 0 on success, a negative error code otherwise. | |
153 | */ | |
154 | static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, | |
155 | int max_if_num, int del_if_num) | |
156 | { | |
157 | int chunk_size, ret = -ENOMEM, if_offset; | |
158 | void *data_ptr = NULL; | |
159 | ||
160 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
161 | ||
162 | /* last interface was removed */ | |
163 | if (max_if_num == 0) | |
164 | goto free_bcast_own; | |
165 | ||
166 | chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; | |
167 | data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); | |
168 | if (!data_ptr) | |
169 | goto unlock; | |
170 | ||
171 | /* copy first part */ | |
172 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); | |
173 | ||
174 | /* copy second part */ | |
175 | memcpy((char *)data_ptr + del_if_num * chunk_size, | |
176 | orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), | |
177 | (max_if_num - del_if_num) * chunk_size); | |
178 | ||
179 | free_bcast_own: | |
180 | kfree(orig_node->bat_iv.bcast_own); | |
181 | orig_node->bat_iv.bcast_own = data_ptr; | |
182 | ||
183 | if (max_if_num == 0) | |
184 | goto free_own_sum; | |
185 | ||
186 | data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); | |
187 | if (!data_ptr) { | |
188 | kfree(orig_node->bat_iv.bcast_own); | |
189 | goto unlock; | |
190 | } | |
191 | ||
192 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
193 | del_if_num * sizeof(uint8_t)); | |
194 | ||
195 | if_offset = (del_if_num + 1) * sizeof(uint8_t); | |
196 | memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), | |
197 | orig_node->bat_iv.bcast_own_sum + if_offset, | |
198 | (max_if_num - del_if_num) * sizeof(uint8_t)); | |
199 | ||
200 | free_own_sum: | |
201 | kfree(orig_node->bat_iv.bcast_own_sum); | |
202 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
203 | ||
204 | ret = 0; | |
205 | unlock: | |
206 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
207 | ||
208 | return ret; | |
209 | } | |
210 | ||
bbad0a5e AQ |
211 | /** |
212 | * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator | |
213 | * @bat_priv: the bat priv with all the soft interface information | |
214 | * @addr: mac address of the originator | |
215 | * | |
216 | * Returns the originator object corresponding to the passed mac address or NULL | |
217 | * on failure. | |
218 | * If the object does not exists it is created an initialised. | |
219 | */ | |
220 | static struct batadv_orig_node * | |
221 | batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr) | |
222 | { | |
223 | struct batadv_orig_node *orig_node; | |
224 | int size, hash_added; | |
225 | ||
226 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
227 | if (orig_node) | |
228 | return orig_node; | |
229 | ||
230 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
231 | if (!orig_node) | |
232 | return NULL; | |
233 | ||
234 | spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); | |
235 | ||
236 | size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
237 | orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); | |
238 | if (!orig_node->bat_iv.bcast_own) | |
239 | goto free_orig_node; | |
240 | ||
241 | size = bat_priv->num_ifaces * sizeof(uint8_t); | |
242 | orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); | |
243 | if (!orig_node->bat_iv.bcast_own_sum) | |
244 | goto free_bcast_own; | |
245 | ||
246 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, | |
247 | batadv_choose_orig, orig_node, | |
248 | &orig_node->hash_entry); | |
249 | if (hash_added != 0) | |
250 | goto free_bcast_own; | |
251 | ||
252 | return orig_node; | |
253 | ||
254 | free_bcast_own: | |
255 | kfree(orig_node->bat_iv.bcast_own); | |
256 | free_orig_node: | |
257 | batadv_orig_node_free_ref(orig_node); | |
258 | ||
259 | return NULL; | |
260 | } | |
261 | ||
56303d34 SE |
262 | static struct batadv_neigh_node * |
263 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
264 | const uint8_t *neigh_addr, | |
265 | struct batadv_orig_node *orig_node, | |
863dd7a8 | 266 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 267 | { |
0538f759 | 268 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
56303d34 | 269 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 270 | |
0538f759 | 271 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); |
7ae8b285 ML |
272 | if (!neigh_node) |
273 | goto out; | |
274 | ||
0538f759 | 275 | spin_lock_init(&neigh_node->bat_iv.lq_update_lock); |
7ae8b285 | 276 | |
0538f759 AQ |
277 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
278 | "Creating new neighbor %pM for orig_node %pM on interface %s\n", | |
279 | neigh_addr, orig_node->orig, hard_iface->net_dev->name); | |
7ae8b285 ML |
280 | |
281 | spin_lock_bh(&orig_node->neigh_list_lock); | |
282 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
283 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
284 | ||
285 | out: | |
286 | return neigh_node; | |
287 | } | |
288 | ||
56303d34 | 289 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 290 | { |
96412690 | 291 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 292 | unsigned char *ogm_buff; |
d7d32ec0 | 293 | uint32_t random_seqno; |
5346c35e | 294 | int res = -ENOMEM; |
d7d32ec0 ML |
295 | |
296 | /* randomize initial seqno to avoid collision */ | |
297 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 298 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 299 | |
14511519 ML |
300 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
301 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
302 | if (!ogm_buff) | |
77af7575 ML |
303 | goto out; |
304 | ||
14511519 ML |
305 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
306 | ||
307 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
a40d9b07 SW |
308 | batadv_ogm_packet->packet_type = BATADV_IV_OGM; |
309 | batadv_ogm_packet->version = BATADV_COMPAT_VERSION; | |
310 | batadv_ogm_packet->ttl = 2; | |
96412690 | 311 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
414254e3 | 312 | batadv_ogm_packet->reserved = 0; |
96412690 | 313 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
77af7575 ML |
314 | |
315 | res = 0; | |
316 | ||
317 | out: | |
318 | return res; | |
d0b9fd89 ML |
319 | } |
320 | ||
56303d34 | 321 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 322 | { |
14511519 ML |
323 | kfree(hard_iface->bat_iv.ogm_buff); |
324 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
325 | } |
326 | ||
56303d34 | 327 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 328 | { |
96412690 | 329 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 330 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 331 | |
14511519 | 332 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 333 | memcpy(batadv_ogm_packet->orig, |
c3229398 | 334 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
96412690 | 335 | memcpy(batadv_ogm_packet->prev_sender, |
c3229398 | 336 | hard_iface->net_dev->dev_addr, ETH_ALEN); |
d0b9fd89 ML |
337 | } |
338 | ||
56303d34 SE |
339 | static void |
340 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 341 | { |
96412690 | 342 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 343 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 344 | |
14511519 | 345 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 346 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
a40d9b07 | 347 | batadv_ogm_packet->ttl = BATADV_TTL; |
d0b9fd89 ML |
348 | } |
349 | ||
b9dacc52 | 350 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 351 | static unsigned long |
56303d34 | 352 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 353 | { |
42d0b044 SE |
354 | unsigned int msecs; |
355 | ||
356 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 357 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
358 | |
359 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
360 | } |
361 | ||
362 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 363 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 364 | { |
e76e4320 | 365 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
366 | } |
367 | ||
368 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
369 | static uint8_t batadv_hop_penalty(uint8_t tq, |
370 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
371 | { |
372 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
373 | int new_tq; |
374 | ||
375 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
376 | new_tq /= BATADV_TQ_MAX_VALUE; | |
377 | ||
378 | return new_tq; | |
b9dacc52 ML |
379 | } |
380 | ||
fc957275 | 381 | /* is there another aggregated packet here? */ |
fe8bc396 | 382 | static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
ef261577 | 383 | __be16 tvlv_len) |
fc957275 | 384 | { |
08c36d3e SE |
385 | int next_buff_pos = 0; |
386 | ||
7e071c79 | 387 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
ef261577 | 388 | next_buff_pos += ntohs(tvlv_len); |
fc957275 ML |
389 | |
390 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 391 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
392 | } |
393 | ||
b9dacc52 | 394 | /* send a batman ogm to a given interface */ |
56303d34 SE |
395 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
396 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 397 | { |
56303d34 | 398 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
b9dacc52 ML |
399 | char *fwd_str; |
400 | uint8_t packet_num; | |
401 | int16_t buff_pos; | |
96412690 | 402 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 403 | struct sk_buff *skb; |
c67893d1 | 404 | uint8_t *packet_pos; |
b9dacc52 | 405 | |
e9a4f295 | 406 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
407 | return; |
408 | ||
409 | packet_num = 0; | |
410 | buff_pos = 0; | |
c67893d1 SE |
411 | packet_pos = forw_packet->skb->data; |
412 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
413 | |
414 | /* adjust all flags and log packets */ | |
fe8bc396 | 415 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
ef261577 | 416 | batadv_ogm_packet->tvlv_len)) { |
b9dacc52 | 417 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
418 | * ordinary base packet |
419 | */ | |
8de47de5 SE |
420 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
421 | forw_packet->if_incoming == hard_iface) | |
96412690 | 422 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 423 | else |
96412690 | 424 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 425 | |
c67893d1 SE |
426 | if (packet_num > 0 || !forw_packet->own) |
427 | fwd_str = "Forwarding"; | |
428 | else | |
429 | fwd_str = "Sending own"; | |
430 | ||
39c75a51 | 431 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
e1bf0c14 | 432 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", |
1eda58bf | 433 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
96412690 SE |
434 | batadv_ogm_packet->orig, |
435 | ntohl(batadv_ogm_packet->seqno), | |
a40d9b07 | 436 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl, |
96412690 | 437 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? |
1eda58bf | 438 | "on" : "off"), |
e1bf0c14 | 439 | hard_iface->net_dev->name, |
1eda58bf | 440 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 441 | |
7e071c79 | 442 | buff_pos += BATADV_OGM_HLEN; |
ef261577 | 443 | buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 444 | packet_num++; |
c67893d1 SE |
445 | packet_pos = forw_packet->skb->data + buff_pos; |
446 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
447 | } |
448 | ||
449 | /* create clone because function is called more than once */ | |
450 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 451 | if (skb) { |
d69909d2 SE |
452 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
453 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 454 | skb->len + ETH_HLEN); |
3193e8fd | 455 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 456 | } |
b9dacc52 ML |
457 | } |
458 | ||
459 | /* send a batman ogm packet */ | |
56303d34 | 460 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 461 | { |
56303d34 | 462 | struct batadv_hard_iface *hard_iface; |
b9dacc52 | 463 | struct net_device *soft_iface; |
56303d34 SE |
464 | struct batadv_priv *bat_priv; |
465 | struct batadv_hard_iface *primary_if = NULL; | |
96412690 | 466 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 467 | unsigned char directlink; |
c67893d1 | 468 | uint8_t *packet_pos; |
b9dacc52 | 469 | |
c67893d1 SE |
470 | packet_pos = forw_packet->skb->data; |
471 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
96412690 | 472 | directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
b9dacc52 ML |
473 | |
474 | if (!forw_packet->if_incoming) { | |
86ceb360 | 475 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
476 | goto out; |
477 | } | |
478 | ||
479 | soft_iface = forw_packet->if_incoming->soft_iface; | |
480 | bat_priv = netdev_priv(soft_iface); | |
481 | ||
e9a4f295 | 482 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
483 | goto out; |
484 | ||
e5d89254 | 485 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
486 | if (!primary_if) |
487 | goto out; | |
488 | ||
9cfc7bd6 SE |
489 | /* multihomed peer assumed |
490 | * non-primary OGMs are only broadcasted on their interface | |
491 | */ | |
a40d9b07 | 492 | if ((directlink && (batadv_ogm_packet->ttl == 1)) || |
b9dacc52 | 493 | (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
b9dacc52 | 494 | /* FIXME: what about aggregated packets ? */ |
39c75a51 | 495 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
496 | "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
497 | (forw_packet->own ? "Sending own" : "Forwarding"), | |
96412690 SE |
498 | batadv_ogm_packet->orig, |
499 | ntohl(batadv_ogm_packet->seqno), | |
a40d9b07 | 500 | batadv_ogm_packet->ttl, |
1eda58bf SE |
501 | forw_packet->if_incoming->net_dev->name, |
502 | forw_packet->if_incoming->net_dev->dev_addr); | |
b9dacc52 ML |
503 | |
504 | /* skb is only used once and than forw_packet is free'd */ | |
9455e34c SE |
505 | batadv_send_skb_packet(forw_packet->skb, |
506 | forw_packet->if_incoming, | |
3193e8fd | 507 | batadv_broadcast_addr); |
b9dacc52 ML |
508 | forw_packet->skb = NULL; |
509 | ||
510 | goto out; | |
511 | } | |
512 | ||
513 | /* broadcast on every interface */ | |
514 | rcu_read_lock(); | |
3193e8fd | 515 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
b9dacc52 ML |
516 | if (hard_iface->soft_iface != soft_iface) |
517 | continue; | |
518 | ||
fe8bc396 | 519 | batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
b9dacc52 ML |
520 | } |
521 | rcu_read_unlock(); | |
522 | ||
523 | out: | |
524 | if (primary_if) | |
e5d89254 | 525 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
526 | } |
527 | ||
528 | /* return true if new_packet can be aggregated with forw_packet */ | |
fe8bc396 | 529 | static bool |
96412690 | 530 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 531 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
532 | int packet_len, unsigned long send_time, |
533 | bool directlink, | |
56303d34 SE |
534 | const struct batadv_hard_iface *if_incoming, |
535 | const struct batadv_forw_packet *forw_packet) | |
b9dacc52 | 536 | { |
96412690 | 537 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 538 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 539 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 540 | bool res = false; |
42d0b044 | 541 | unsigned long aggregation_end_time; |
b9dacc52 | 542 | |
96412690 | 543 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
544 | aggregation_end_time = send_time; |
545 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 546 | |
9cfc7bd6 | 547 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
548 | * if: |
549 | * | |
550 | * - the send time is within our MAX_AGGREGATION_MS time | |
551 | * - the resulting packet wont be bigger than | |
552 | * MAX_AGGREGATION_BYTES | |
553 | */ | |
b9dacc52 | 554 | if (time_before(send_time, forw_packet->send_time) && |
42d0b044 SE |
555 | time_after_eq(aggregation_end_time, forw_packet->send_time) && |
556 | (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { | |
9cfc7bd6 | 557 | /* check aggregation compatibility |
b9dacc52 ML |
558 | * -> direct link packets are broadcasted on |
559 | * their interface only | |
560 | * -> aggregate packet if the current packet is | |
561 | * a "global" packet as well as the base | |
562 | * packet | |
563 | */ | |
e5d89254 | 564 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 ML |
565 | if (!primary_if) |
566 | goto out; | |
567 | ||
568 | /* packets without direct link flag and high TTL | |
9cfc7bd6 SE |
569 | * are flooded through the net |
570 | */ | |
b9dacc52 | 571 | if ((!directlink) && |
96412690 | 572 | (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
a40d9b07 | 573 | (batadv_ogm_packet->ttl != 1) && |
b9dacc52 ML |
574 | |
575 | /* own packets originating non-primary | |
9cfc7bd6 SE |
576 | * interfaces leave only that interface |
577 | */ | |
b9dacc52 ML |
578 | ((!forw_packet->own) || |
579 | (forw_packet->if_incoming == primary_if))) { | |
580 | res = true; | |
581 | goto out; | |
582 | } | |
583 | ||
584 | /* if the incoming packet is sent via this one | |
9cfc7bd6 SE |
585 | * interface only - we still can aggregate |
586 | */ | |
b9dacc52 | 587 | if ((directlink) && |
a40d9b07 | 588 | (new_bat_ogm_packet->ttl == 1) && |
b9dacc52 ML |
589 | (forw_packet->if_incoming == if_incoming) && |
590 | ||
591 | /* packets from direct neighbors or | |
592 | * own secondary interface packets | |
9cfc7bd6 SE |
593 | * (= secondary interface packets in general) |
594 | */ | |
96412690 | 595 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
b9dacc52 ML |
596 | (forw_packet->own && |
597 | forw_packet->if_incoming != primary_if))) { | |
598 | res = true; | |
599 | goto out; | |
600 | } | |
601 | } | |
602 | ||
603 | out: | |
604 | if (primary_if) | |
e5d89254 | 605 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
606 | return res; |
607 | } | |
608 | ||
609 | /* create a new aggregated packet and add this packet to it */ | |
fe8bc396 SE |
610 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
611 | int packet_len, unsigned long send_time, | |
612 | bool direct_link, | |
56303d34 | 613 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 614 | int own_packet) |
b9dacc52 | 615 | { |
56303d34 SE |
616 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
617 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 618 | unsigned char *skb_buff; |
42d0b044 | 619 | unsigned int skb_size; |
b9dacc52 ML |
620 | |
621 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
622 | return; | |
623 | ||
624 | /* own packet should always be scheduled */ | |
625 | if (!own_packet) { | |
3e34819e | 626 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 627 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 628 | "batman packet queue full\n"); |
b9dacc52 ML |
629 | goto out; |
630 | } | |
631 | } | |
632 | ||
633 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
634 | if (!forw_packet_aggr) { | |
635 | if (!own_packet) | |
636 | atomic_inc(&bat_priv->batman_queue_left); | |
637 | goto out; | |
638 | } | |
639 | ||
640 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
42d0b044 | 641 | (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
5b246574 | 642 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 643 | else |
5b246574 SE |
644 | skb_size = packet_len; |
645 | ||
41ab6c48 | 646 | skb_size += ETH_HLEN; |
b9dacc52 | 647 | |
41ab6c48 | 648 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
b9dacc52 ML |
649 | if (!forw_packet_aggr->skb) { |
650 | if (!own_packet) | |
651 | atomic_inc(&bat_priv->batman_queue_left); | |
652 | kfree(forw_packet_aggr); | |
653 | goto out; | |
654 | } | |
c54f38c9 | 655 | forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 656 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 657 | |
b9dacc52 ML |
658 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
659 | forw_packet_aggr->packet_len = packet_len; | |
660 | memcpy(skb_buff, packet_buff, packet_len); | |
661 | ||
662 | forw_packet_aggr->own = own_packet; | |
663 | forw_packet_aggr->if_incoming = if_incoming; | |
664 | forw_packet_aggr->num_packets = 0; | |
42d0b044 | 665 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
666 | forw_packet_aggr->send_time = send_time; |
667 | ||
668 | /* save packet direct link flag status */ | |
669 | if (direct_link) | |
670 | forw_packet_aggr->direct_link_flags |= 1; | |
671 | ||
672 | /* add new packet to packet list */ | |
673 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
674 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
675 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
676 | ||
677 | /* start timer for this packet */ | |
678 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 679 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 680 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
681 | &forw_packet_aggr->delayed_work, |
682 | send_time - jiffies); | |
683 | ||
684 | return; | |
685 | out: | |
e5d89254 | 686 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
687 | } |
688 | ||
689 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 690 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
691 | const unsigned char *packet_buff, |
692 | int packet_len, bool direct_link) | |
b9dacc52 ML |
693 | { |
694 | unsigned char *skb_buff; | |
8de47de5 | 695 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
696 | |
697 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
698 | memcpy(skb_buff, packet_buff, packet_len); | |
699 | forw_packet_aggr->packet_len += packet_len; | |
700 | forw_packet_aggr->num_packets++; | |
701 | ||
702 | /* save packet direct link flag status */ | |
8de47de5 SE |
703 | if (direct_link) { |
704 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
705 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
706 | } | |
b9dacc52 ML |
707 | } |
708 | ||
56303d34 | 709 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
710 | unsigned char *packet_buff, |
711 | int packet_len, | |
56303d34 | 712 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 713 | int own_packet, unsigned long send_time) |
b9dacc52 | 714 | { |
9cfc7bd6 | 715 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
716 | * _pos -> pointer to the position in the queue |
717 | */ | |
56303d34 SE |
718 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
719 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 720 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 721 | bool direct_link; |
42d0b044 | 722 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 723 | |
96412690 SE |
724 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
725 | direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; | |
42d0b044 | 726 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
727 | |
728 | /* find position for the packet in the forward queue */ | |
729 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
730 | /* own packets are not to be aggregated */ | |
731 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
b67bfe0d | 732 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 733 | &bat_priv->forw_bat_list, list) { |
96412690 | 734 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
735 | bat_priv, packet_len, |
736 | send_time, direct_link, | |
737 | if_incoming, | |
738 | forw_packet_pos)) { | |
b9dacc52 ML |
739 | forw_packet_aggr = forw_packet_pos; |
740 | break; | |
741 | } | |
742 | } | |
743 | } | |
744 | ||
745 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
746 | * suitable aggregation packet found |
747 | */ | |
b9dacc52 ML |
748 | if (!forw_packet_aggr) { |
749 | /* the following section can run without the lock */ | |
750 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
751 | ||
9cfc7bd6 | 752 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
753 | * we hold it back for a while, so that it might be aggregated |
754 | * later on | |
755 | */ | |
42d0b044 SE |
756 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
757 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 758 | |
fe8bc396 SE |
759 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
760 | send_time, direct_link, | |
761 | if_incoming, own_packet); | |
b9dacc52 | 762 | } else { |
fe8bc396 SE |
763 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
764 | packet_len, direct_link); | |
b9dacc52 ML |
765 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
766 | } | |
767 | } | |
768 | ||
56303d34 | 769 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 770 | const struct ethhdr *ethhdr, |
96412690 | 771 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
772 | bool is_single_hop_neigh, |
773 | bool is_from_best_next_hop, | |
56303d34 | 774 | struct batadv_hard_iface *if_incoming) |
b9dacc52 | 775 | { |
56303d34 | 776 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
ef261577 | 777 | uint16_t tvlv_len; |
b9dacc52 | 778 | |
a40d9b07 | 779 | if (batadv_ogm_packet->ttl <= 1) { |
39c75a51 | 780 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
781 | return; |
782 | } | |
783 | ||
13b2541b ML |
784 | if (!is_from_best_next_hop) { |
785 | /* Mark the forwarded packet when it is not coming from our | |
786 | * best next hop. We still need to forward the packet for our | |
787 | * neighbor link quality detection to work in case the packet | |
788 | * originated from a single hop neighbor. Otherwise we can | |
789 | * simply drop the ogm. | |
790 | */ | |
791 | if (is_single_hop_neigh) | |
96412690 | 792 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
793 | else |
794 | return; | |
795 | } | |
b9dacc52 | 796 | |
ef261577 | 797 | tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 798 | |
a40d9b07 | 799 | batadv_ogm_packet->ttl--; |
96412690 | 800 | memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
b9dacc52 | 801 | |
b9dacc52 | 802 | /* apply hop penalty */ |
96412690 | 803 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 804 | bat_priv); |
b9dacc52 | 805 | |
39c75a51 | 806 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 807 | "Forwarding packet: tq: %i, ttl: %i\n", |
a40d9b07 | 808 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl); |
b9dacc52 | 809 | |
b9dacc52 | 810 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 811 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 812 | if (is_single_hop_neigh) |
96412690 | 813 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 814 | else |
96412690 | 815 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 816 | |
96412690 | 817 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
ef261577 | 818 | BATADV_OGM_HLEN + tvlv_len, |
fe8bc396 | 819 | if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
b9dacc52 ML |
820 | } |
821 | ||
d9896617 AQ |
822 | /** |
823 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
824 | * the given interface | |
825 | * @hard_iface: the interface for which the windows have to be shifted | |
826 | */ | |
827 | static void | |
828 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
829 | { | |
830 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
831 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
832 | struct hlist_head *head; | |
833 | struct batadv_orig_node *orig_node; | |
834 | unsigned long *word; | |
835 | uint32_t i; | |
836 | size_t word_index; | |
837 | uint8_t *w; | |
bbad0a5e | 838 | int if_num; |
d9896617 AQ |
839 | |
840 | for (i = 0; i < hash->size; i++) { | |
841 | head = &hash->table[i]; | |
842 | ||
843 | rcu_read_lock(); | |
844 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
bbad0a5e | 845 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 | 846 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
bbad0a5e | 847 | word = &(orig_node->bat_iv.bcast_own[word_index]); |
d9896617 AQ |
848 | |
849 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
bbad0a5e AQ |
850 | if_num = hard_iface->if_num; |
851 | w = &orig_node->bat_iv.bcast_own_sum[if_num]; | |
d9896617 | 852 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); |
bbad0a5e | 853 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 AQ |
854 | } |
855 | rcu_read_unlock(); | |
856 | } | |
857 | } | |
858 | ||
56303d34 | 859 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 860 | { |
56303d34 | 861 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 862 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 863 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 864 | struct batadv_hard_iface *primary_if; |
14511519 | 865 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
bbb1f90e | 866 | uint32_t seqno; |
ef261577 | 867 | uint16_t tvlv_len = 0; |
b9dacc52 | 868 | |
e5d89254 | 869 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 870 | |
e1bf0c14 ML |
871 | if (hard_iface == primary_if) { |
872 | /* tt changes have to be committed before the tvlv data is | |
873 | * appended as it may alter the tt tvlv container | |
874 | */ | |
875 | batadv_tt_local_commit_changes(bat_priv); | |
ef261577 ML |
876 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, |
877 | ogm_buff_len, | |
878 | BATADV_OGM_HLEN); | |
e1bf0c14 | 879 | } |
be9aa4c1 | 880 | |
14511519 | 881 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
ef261577 | 882 | batadv_ogm_packet->tvlv_len = htons(tvlv_len); |
b9dacc52 ML |
883 | |
884 | /* change sequence number to network order */ | |
14511519 | 885 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 886 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 887 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 888 | |
d9896617 | 889 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
14511519 ML |
890 | batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
891 | hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, | |
fe8bc396 | 892 | batadv_iv_ogm_emit_send_time(bat_priv)); |
b9dacc52 ML |
893 | |
894 | if (primary_if) | |
e5d89254 | 895 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
896 | } |
897 | ||
fe8bc396 | 898 | static void |
56303d34 SE |
899 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
900 | struct batadv_orig_node *orig_node, | |
fe8bc396 | 901 | const struct ethhdr *ethhdr, |
96412690 | 902 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 903 | struct batadv_hard_iface *if_incoming, |
fe8bc396 | 904 | const unsigned char *tt_buff, |
7c24bbbe | 905 | enum batadv_dup_status dup_status) |
fc957275 | 906 | { |
56303d34 SE |
907 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
908 | struct batadv_neigh_node *router = NULL; | |
909 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 910 | int if_num; |
bbb1f90e | 911 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 912 | uint8_t *neigh_addr; |
bbb1f90e | 913 | uint8_t tq_avg; |
fc957275 | 914 | |
39c75a51 | 915 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 916 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
917 | |
918 | rcu_read_lock(); | |
b67bfe0d | 919 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 920 | &orig_node->neigh_list, list) { |
1eda58bf SE |
921 | neigh_addr = tmp_neigh_node->addr; |
922 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
923 | tmp_neigh_node->if_incoming == if_incoming && | |
924 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
38dc40ef | 925 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
7d211efc | 926 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
927 | neigh_node = tmp_neigh_node; |
928 | continue; | |
929 | } | |
930 | ||
7c24bbbe | 931 | if (dup_status != BATADV_NO_DUP) |
fc957275 ML |
932 | continue; |
933 | ||
0538f759 AQ |
934 | spin_lock_bh(&tmp_neigh_node->bat_iv.lq_update_lock); |
935 | batadv_ring_buffer_set(tmp_neigh_node->bat_iv.tq_recv, | |
936 | &tmp_neigh_node->bat_iv.tq_index, 0); | |
937 | tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->bat_iv.tq_recv); | |
938 | tmp_neigh_node->bat_iv.tq_avg = tq_avg; | |
939 | spin_unlock_bh(&tmp_neigh_node->bat_iv.lq_update_lock); | |
fc957275 ML |
940 | } |
941 | ||
942 | if (!neigh_node) { | |
56303d34 | 943 | struct batadv_orig_node *orig_tmp; |
fc957275 | 944 | |
bbad0a5e | 945 | orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); |
fc957275 ML |
946 | if (!orig_tmp) |
947 | goto unlock; | |
948 | ||
fe8bc396 SE |
949 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
950 | ethhdr->h_source, | |
863dd7a8 | 951 | orig_node, orig_tmp); |
fc957275 | 952 | |
7d211efc | 953 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
954 | if (!neigh_node) |
955 | goto unlock; | |
956 | } else | |
39c75a51 | 957 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 958 | "Updating existing last-hop neighbor of originator\n"); |
fc957275 ML |
959 | |
960 | rcu_read_unlock(); | |
961 | ||
d7b2a97e | 962 | neigh_node->last_seen = jiffies; |
fc957275 | 963 | |
0538f759 AQ |
964 | spin_lock_bh(&neigh_node->bat_iv.lq_update_lock); |
965 | batadv_ring_buffer_set(neigh_node->bat_iv.tq_recv, | |
966 | &neigh_node->bat_iv.tq_index, | |
96412690 | 967 | batadv_ogm_packet->tq); |
0538f759 AQ |
968 | tq_avg = batadv_ring_buffer_avg(neigh_node->bat_iv.tq_recv); |
969 | neigh_node->bat_iv.tq_avg = tq_avg; | |
970 | spin_unlock_bh(&neigh_node->bat_iv.lq_update_lock); | |
fc957275 | 971 | |
7c24bbbe | 972 | if (dup_status == BATADV_NO_DUP) { |
a40d9b07 SW |
973 | orig_node->last_ttl = batadv_ogm_packet->ttl; |
974 | neigh_node->last_ttl = batadv_ogm_packet->ttl; | |
fc957275 ML |
975 | } |
976 | ||
fc957275 | 977 | /* if this neighbor already is our next hop there is nothing |
9cfc7bd6 SE |
978 | * to change |
979 | */ | |
7d211efc | 980 | router = batadv_orig_node_get_router(orig_node); |
fc957275 | 981 | if (router == neigh_node) |
e1bf0c14 | 982 | goto out; |
fc957275 ML |
983 | |
984 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
0538f759 | 985 | if (router && (router->bat_iv.tq_avg > neigh_node->bat_iv.tq_avg)) |
e1bf0c14 | 986 | goto out; |
fc957275 ML |
987 | |
988 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
989 | * won't consider it either |
990 | */ | |
0538f759 | 991 | if (router && (neigh_node->bat_iv.tq_avg == router->bat_iv.tq_avg)) { |
fc957275 | 992 | orig_node_tmp = router->orig_node; |
bbad0a5e | 993 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 994 | if_num = router->if_incoming->if_num; |
bbad0a5e AQ |
995 | sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
996 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 ML |
997 | |
998 | orig_node_tmp = neigh_node->orig_node; | |
bbad0a5e | 999 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1000 | if_num = neigh_node->if_incoming->if_num; |
bbad0a5e AQ |
1001 | sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1002 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 | 1003 | |
bbb1f90e | 1004 | if (sum_orig >= sum_neigh) |
e1bf0c14 | 1005 | goto out; |
fc957275 ML |
1006 | } |
1007 | ||
30d3c511 | 1008 | batadv_update_route(bat_priv, orig_node, neigh_node); |
fc957275 ML |
1009 | goto out; |
1010 | ||
1011 | unlock: | |
1012 | rcu_read_unlock(); | |
1013 | out: | |
1014 | if (neigh_node) | |
7d211efc | 1015 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 1016 | if (router) |
7d211efc | 1017 | batadv_neigh_node_free_ref(router); |
fc957275 ML |
1018 | } |
1019 | ||
56303d34 SE |
1020 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
1021 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 1022 | struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1023 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1024 | { |
56303d34 SE |
1025 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1026 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
fc957275 | 1027 | uint8_t total_count; |
42d0b044 SE |
1028 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
1029 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
bbad0a5e | 1030 | int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; |
42d0b044 | 1031 | unsigned int combined_tq; |
fc957275 ML |
1032 | |
1033 | /* find corresponding one hop neighbor */ | |
1034 | rcu_read_lock(); | |
b67bfe0d | 1035 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1036 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
1037 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
1038 | orig_neigh_node->orig)) | |
fc957275 ML |
1039 | continue; |
1040 | ||
1041 | if (tmp_neigh_node->if_incoming != if_incoming) | |
1042 | continue; | |
1043 | ||
1044 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1045 | continue; | |
1046 | ||
1047 | neigh_node = tmp_neigh_node; | |
1048 | break; | |
1049 | } | |
1050 | rcu_read_unlock(); | |
1051 | ||
1052 | if (!neigh_node) | |
fe8bc396 SE |
1053 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1054 | orig_neigh_node->orig, | |
1055 | orig_neigh_node, | |
863dd7a8 | 1056 | orig_neigh_node); |
fc957275 ML |
1057 | |
1058 | if (!neigh_node) | |
1059 | goto out; | |
1060 | ||
d7b2a97e | 1061 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 1062 | if (orig_node == orig_neigh_node) |
d7b2a97e | 1063 | neigh_node->last_seen = jiffies; |
fc957275 | 1064 | |
d7b2a97e | 1065 | orig_node->last_seen = jiffies; |
fc957275 ML |
1066 | |
1067 | /* find packet count of corresponding one hop neighbor */ | |
bbad0a5e AQ |
1068 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
1069 | if_num = if_incoming->if_num; | |
1070 | orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
0538f759 | 1071 | neigh_rq_count = neigh_node->bat_iv.real_packet_count; |
bbad0a5e | 1072 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
fc957275 ML |
1073 | |
1074 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
1075 | if (orig_eq_count > neigh_rq_count) |
1076 | total_count = neigh_rq_count; | |
1077 | else | |
1078 | total_count = orig_eq_count; | |
fc957275 | 1079 | |
9cfc7bd6 SE |
1080 | /* if we have too few packets (too less data) we set tq_own to zero |
1081 | * if we receive too few packets it is not considered bidirectional | |
1082 | */ | |
42d0b044 SE |
1083 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
1084 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
1085 | tq_own = 0; |
1086 | else | |
1087 | /* neigh_node->real_packet_count is never zero as we | |
1088 | * only purge old information when getting new | |
9cfc7bd6 SE |
1089 | * information |
1090 | */ | |
42d0b044 | 1091 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 1092 | |
21a1236b | 1093 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
1094 | * affect the nearly-symmetric links only a little, but |
1095 | * punishes asymmetric links more. This will give a value | |
1096 | * between 0 and TQ_MAX_VALUE | |
1097 | */ | |
42d0b044 SE |
1098 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
1099 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
1100 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1101 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1102 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
1103 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
1104 | inv_asym_penalty /= neigh_rq_max_cube; | |
1105 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
1106 | ||
96412690 | 1107 | combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
42d0b044 | 1108 | combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
96412690 | 1109 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 1110 | |
39c75a51 | 1111 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1112 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
1113 | orig_node->orig, orig_neigh_node->orig, total_count, | |
1114 | neigh_rq_count, tq_own, | |
96412690 | 1115 | tq_asym_penalty, batadv_ogm_packet->tq); |
fc957275 ML |
1116 | |
1117 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
1118 | * consider it bidirectional |
1119 | */ | |
96412690 | 1120 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
1121 | ret = 1; |
1122 | ||
1123 | out: | |
1124 | if (neigh_node) | |
7d211efc | 1125 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
1126 | return ret; |
1127 | } | |
1128 | ||
7c24bbbe SW |
1129 | /** |
1130 | * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, | |
1131 | * adjust the sequence number and find out whether it is a duplicate | |
1132 | * @ethhdr: ethernet header of the packet | |
1133 | * @batadv_ogm_packet: OGM packet to be considered | |
1134 | * @if_incoming: interface on which the OGM packet was received | |
1135 | * | |
1136 | * Returns duplicate status as enum batadv_dup_status | |
fc957275 | 1137 | */ |
7c24bbbe | 1138 | static enum batadv_dup_status |
fe8bc396 | 1139 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
96412690 | 1140 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1141 | const struct batadv_hard_iface *if_incoming) |
fc957275 | 1142 | { |
56303d34 SE |
1143 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1144 | struct batadv_orig_node *orig_node; | |
1145 | struct batadv_neigh_node *tmp_neigh_node; | |
7c24bbbe | 1146 | int is_dup; |
fc957275 ML |
1147 | int32_t seq_diff; |
1148 | int need_update = 0; | |
7c24bbbe SW |
1149 | int set_mark; |
1150 | enum batadv_dup_status ret = BATADV_NO_DUP; | |
96412690 | 1151 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 1152 | uint8_t *neigh_addr; |
bbb1f90e | 1153 | uint8_t packet_count; |
0538f759 | 1154 | unsigned long *bitmap; |
fc957275 | 1155 | |
bbad0a5e | 1156 | orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
fc957275 | 1157 | if (!orig_node) |
7c24bbbe | 1158 | return BATADV_NO_DUP; |
fc957275 | 1159 | |
bbad0a5e | 1160 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
e0f5211f | 1161 | seq_diff = seqno - orig_node->last_real_seqno; |
fc957275 ML |
1162 | |
1163 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1164 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 | 1165 | batadv_window_protected(bat_priv, seq_diff, |
7c24bbbe SW |
1166 | &orig_node->batman_seqno_reset)) { |
1167 | ret = BATADV_PROTECTED; | |
fc957275 | 1168 | goto out; |
7c24bbbe | 1169 | } |
fc957275 ML |
1170 | |
1171 | rcu_read_lock(); | |
b67bfe0d | 1172 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1173 | &orig_node->neigh_list, list) { |
1eda58bf | 1174 | neigh_addr = tmp_neigh_node->addr; |
0538f759 | 1175 | is_dup = batadv_test_bit(tmp_neigh_node->bat_iv.real_bits, |
7c24bbbe SW |
1176 | orig_node->last_real_seqno, |
1177 | seqno); | |
1178 | ||
1eda58bf | 1179 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
7c24bbbe | 1180 | tmp_neigh_node->if_incoming == if_incoming) { |
fc957275 | 1181 | set_mark = 1; |
7c24bbbe SW |
1182 | if (is_dup) |
1183 | ret = BATADV_NEIGH_DUP; | |
1184 | } else { | |
fc957275 | 1185 | set_mark = 0; |
7c24bbbe SW |
1186 | if (is_dup && (ret != BATADV_NEIGH_DUP)) |
1187 | ret = BATADV_ORIG_DUP; | |
1188 | } | |
fc957275 ML |
1189 | |
1190 | /* if the window moved, set the update flag. */ | |
0538f759 AQ |
1191 | bitmap = tmp_neigh_node->bat_iv.real_bits; |
1192 | need_update |= batadv_bit_get_packet(bat_priv, bitmap, | |
0f5f9322 | 1193 | seq_diff, set_mark); |
fc957275 | 1194 | |
0538f759 | 1195 | packet_count = bitmap_weight(tmp_neigh_node->bat_iv.real_bits, |
bbb1f90e | 1196 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
0538f759 | 1197 | tmp_neigh_node->bat_iv.real_packet_count = packet_count; |
fc957275 ML |
1198 | } |
1199 | rcu_read_unlock(); | |
1200 | ||
1201 | if (need_update) { | |
39c75a51 | 1202 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1203 | "updating last_seqno: old %u, new %u\n", |
1204 | orig_node->last_real_seqno, seqno); | |
e0f5211f | 1205 | orig_node->last_real_seqno = seqno; |
fc957275 ML |
1206 | } |
1207 | ||
fc957275 | 1208 | out: |
bbad0a5e | 1209 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7d211efc | 1210 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1211 | return ret; |
1212 | } | |
1213 | ||
fe8bc396 | 1214 | static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
96412690 | 1215 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 | 1216 | const unsigned char *tt_buff, |
56303d34 | 1217 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1218 | { |
56303d34 SE |
1219 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1220 | struct batadv_hard_iface *hard_iface; | |
0538f759 | 1221 | struct batadv_orig_node *orig_neigh_node, *orig_node, *orig_node_tmp; |
56303d34 SE |
1222 | struct batadv_neigh_node *router = NULL, *router_router = NULL; |
1223 | struct batadv_neigh_node *orig_neigh_router = NULL; | |
fc957275 ML |
1224 | int has_directlink_flag; |
1225 | int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
281581d3 | 1226 | int is_bidirect; |
75cd33f8 | 1227 | bool is_single_hop_neigh = false; |
13b2541b | 1228 | bool is_from_best_next_hop = false; |
7c24bbbe SW |
1229 | int sameseq, similar_ttl; |
1230 | enum batadv_dup_status dup_status; | |
fc957275 | 1231 | uint32_t if_incoming_seqno; |
1eda58bf | 1232 | uint8_t *prev_sender; |
fc957275 ML |
1233 | |
1234 | /* Silently drop when the batman packet is actually not a | |
1235 | * correct packet. | |
1236 | * | |
1237 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1238 | * minimum frame length of 64 byte) and the aggregation interprets | |
1239 | * it as an additional length. | |
1240 | * | |
1241 | * TODO: A more sane solution would be to have a bit in the | |
96412690 | 1242 | * batadv_ogm_packet to detect whether the packet is the last |
fc957275 ML |
1243 | * packet in an aggregation. Here we expect that the padding |
1244 | * is always zero (or not 0x01) | |
1245 | */ | |
a40d9b07 | 1246 | if (batadv_ogm_packet->packet_type != BATADV_IV_OGM) |
fc957275 ML |
1247 | return; |
1248 | ||
1249 | /* could be changed by schedule_own_packet() */ | |
14511519 | 1250 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
fc957275 | 1251 | |
96412690 | 1252 | if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
acd34afa SE |
1253 | has_directlink_flag = 1; |
1254 | else | |
1255 | has_directlink_flag = 0; | |
fc957275 | 1256 | |
96412690 | 1257 | if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
75cd33f8 | 1258 | is_single_hop_neigh = true; |
fc957275 | 1259 | |
39c75a51 | 1260 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
e1bf0c14 | 1261 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n", |
1eda58bf | 1262 | ethhdr->h_source, if_incoming->net_dev->name, |
96412690 SE |
1263 | if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
1264 | batadv_ogm_packet->prev_sender, | |
e1bf0c14 | 1265 | ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->tq, |
a40d9b07 SW |
1266 | batadv_ogm_packet->ttl, |
1267 | batadv_ogm_packet->version, has_directlink_flag); | |
fc957275 ML |
1268 | |
1269 | rcu_read_lock(); | |
3193e8fd | 1270 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 1271 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
fc957275 ML |
1272 | continue; |
1273 | ||
1274 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1275 | continue; | |
1276 | ||
1eda58bf SE |
1277 | if (batadv_compare_eth(ethhdr->h_source, |
1278 | hard_iface->net_dev->dev_addr)) | |
fc957275 ML |
1279 | is_my_addr = 1; |
1280 | ||
96412690 | 1281 | if (batadv_compare_eth(batadv_ogm_packet->orig, |
1eda58bf | 1282 | hard_iface->net_dev->dev_addr)) |
fc957275 ML |
1283 | is_my_orig = 1; |
1284 | ||
96412690 | 1285 | if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
1eda58bf | 1286 | hard_iface->net_dev->dev_addr)) |
fc957275 | 1287 | is_my_oldorig = 1; |
fc957275 ML |
1288 | } |
1289 | rcu_read_unlock(); | |
1290 | ||
fc957275 | 1291 | if (is_my_addr) { |
39c75a51 | 1292 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1293 | "Drop packet: received my own broadcast (sender: %pM)\n", |
1294 | ethhdr->h_source); | |
fc957275 ML |
1295 | return; |
1296 | } | |
1297 | ||
fc957275 ML |
1298 | if (is_my_orig) { |
1299 | unsigned long *word; | |
1300 | int offset; | |
9b4a1159 | 1301 | int32_t bit_pos; |
42d0b044 SE |
1302 | int16_t if_num; |
1303 | uint8_t *weight; | |
fc957275 | 1304 | |
bbad0a5e AQ |
1305 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
1306 | ethhdr->h_source); | |
fc957275 ML |
1307 | if (!orig_neigh_node) |
1308 | return; | |
1309 | ||
1310 | /* neighbor has to indicate direct link and it has to | |
9cfc7bd6 SE |
1311 | * come via the corresponding interface |
1312 | * save packet seqno for bidirectional check | |
1313 | */ | |
fc957275 | 1314 | if (has_directlink_flag && |
1eda58bf | 1315 | batadv_compare_eth(if_incoming->net_dev->dev_addr, |
96412690 | 1316 | batadv_ogm_packet->orig)) { |
42d0b044 SE |
1317 | if_num = if_incoming->if_num; |
1318 | offset = if_num * BATADV_NUM_WORDS; | |
fc957275 | 1319 | |
bbad0a5e AQ |
1320 | spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); |
1321 | word = &(orig_neigh_node->bat_iv.bcast_own[offset]); | |
9b4a1159 | 1322 | bit_pos = if_incoming_seqno - 2; |
96412690 | 1323 | bit_pos -= ntohl(batadv_ogm_packet->seqno); |
9b4a1159 | 1324 | batadv_set_bit(word, bit_pos); |
bbad0a5e | 1325 | weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; |
42d0b044 SE |
1326 | *weight = bitmap_weight(word, |
1327 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
bbad0a5e | 1328 | spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); |
fc957275 ML |
1329 | } |
1330 | ||
39c75a51 | 1331 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1332 | "Drop packet: originator packet from myself (via neighbor)\n"); |
7d211efc | 1333 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1334 | return; |
1335 | } | |
1336 | ||
1337 | if (is_my_oldorig) { | |
39c75a51 | 1338 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1339 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
1340 | ethhdr->h_source); | |
fc957275 ML |
1341 | return; |
1342 | } | |
1343 | ||
96412690 | 1344 | if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
39c75a51 | 1345 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1346 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
1347 | ethhdr->h_source); | |
13b2541b ML |
1348 | return; |
1349 | } | |
1350 | ||
bbad0a5e | 1351 | orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
fc957275 ML |
1352 | if (!orig_node) |
1353 | return; | |
1354 | ||
7c24bbbe SW |
1355 | dup_status = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
1356 | if_incoming); | |
fc957275 | 1357 | |
7c24bbbe | 1358 | if (dup_status == BATADV_PROTECTED) { |
39c75a51 | 1359 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1360 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1361 | ethhdr->h_source); | |
fc957275 ML |
1362 | goto out; |
1363 | } | |
1364 | ||
96412690 | 1365 | if (batadv_ogm_packet->tq == 0) { |
39c75a51 | 1366 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1367 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1368 | goto out; |
1369 | } | |
1370 | ||
7d211efc | 1371 | router = batadv_orig_node_get_router(orig_node); |
0538f759 AQ |
1372 | if (router) { |
1373 | orig_node_tmp = router->orig_node; | |
1374 | router_router = batadv_orig_node_get_router(orig_node_tmp); | |
1375 | } | |
fc957275 | 1376 | |
0538f759 | 1377 | if ((router && router->bat_iv.tq_avg != 0) && |
1eda58bf | 1378 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1379 | is_from_best_next_hop = true; |
1380 | ||
96412690 | 1381 | prev_sender = batadv_ogm_packet->prev_sender; |
fc957275 ML |
1382 | /* avoid temporary routing loops */ |
1383 | if (router && router_router && | |
1eda58bf | 1384 | (batadv_compare_eth(router->addr, prev_sender)) && |
96412690 | 1385 | !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
1eda58bf | 1386 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1387 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1388 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1389 | ethhdr->h_source); | |
fc957275 ML |
1390 | goto out; |
1391 | } | |
1392 | ||
ef261577 ML |
1393 | batadv_tvlv_ogm_receive(bat_priv, batadv_ogm_packet, orig_node); |
1394 | ||
fc957275 | 1395 | /* if sender is a direct neighbor the sender mac equals |
9cfc7bd6 SE |
1396 | * originator mac |
1397 | */ | |
c67893d1 SE |
1398 | if (is_single_hop_neigh) |
1399 | orig_neigh_node = orig_node; | |
1400 | else | |
bbad0a5e AQ |
1401 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
1402 | ethhdr->h_source); | |
c67893d1 | 1403 | |
fc957275 ML |
1404 | if (!orig_neigh_node) |
1405 | goto out; | |
1406 | ||
d56b1705 MH |
1407 | /* Update nc_nodes of the originator */ |
1408 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
1409 | batadv_ogm_packet, is_single_hop_neigh); | |
1410 | ||
7d211efc | 1411 | orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
fc957275 ML |
1412 | |
1413 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1414 | * don't route towards it |
1415 | */ | |
fc957275 | 1416 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1417 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1418 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1419 | goto out_neigh; |
1420 | } | |
1421 | ||
fe8bc396 | 1422 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
96412690 | 1423 | batadv_ogm_packet, if_incoming); |
fc957275 | 1424 | |
fc957275 | 1425 | /* update ranking if it is not a duplicate or has the same |
9cfc7bd6 SE |
1426 | * seqno and similar ttl as the non-duplicate |
1427 | */ | |
96412690 | 1428 | sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
a40d9b07 | 1429 | similar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->ttl; |
7c24bbbe SW |
1430 | if (is_bidirect && ((dup_status == BATADV_NO_DUP) || |
1431 | (sameseq && similar_ttl))) | |
fe8bc396 | 1432 | batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, |
96412690 | 1433 | batadv_ogm_packet, if_incoming, |
7c24bbbe | 1434 | tt_buff, dup_status); |
fc957275 ML |
1435 | |
1436 | /* is single hop (direct) neighbor */ | |
1437 | if (is_single_hop_neigh) { | |
fc957275 | 1438 | /* mark direct link on incoming interface */ |
96412690 | 1439 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1440 | is_single_hop_neigh, |
1441 | is_from_best_next_hop, if_incoming); | |
fc957275 | 1442 | |
39c75a51 | 1443 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1444 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1445 | goto out_neigh; |
1446 | } | |
1447 | ||
1448 | /* multihop originator */ | |
fe8bc396 | 1449 | if (!is_bidirect) { |
39c75a51 | 1450 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1451 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1452 | goto out_neigh; |
1453 | } | |
1454 | ||
7c24bbbe | 1455 | if (dup_status == BATADV_NEIGH_DUP) { |
39c75a51 | 1456 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1457 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1458 | goto out_neigh; |
1459 | } | |
1460 | ||
39c75a51 | 1461 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1462 | "Forwarding packet: rebroadcast originator packet\n"); |
96412690 | 1463 | batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
fe8bc396 SE |
1464 | is_single_hop_neigh, is_from_best_next_hop, |
1465 | if_incoming); | |
fc957275 ML |
1466 | |
1467 | out_neigh: | |
1468 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1469 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 ML |
1470 | out: |
1471 | if (router) | |
7d211efc | 1472 | batadv_neigh_node_free_ref(router); |
fc957275 | 1473 | if (router_router) |
7d211efc | 1474 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1475 | if (orig_neigh_router) |
7d211efc | 1476 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1477 | |
7d211efc | 1478 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1479 | } |
1480 | ||
fe8bc396 | 1481 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1482 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1483 | { |
56303d34 | 1484 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
96412690 | 1485 | struct batadv_ogm_packet *batadv_ogm_packet; |
8780dad9 ML |
1486 | struct ethhdr *ethhdr; |
1487 | int buff_pos = 0, packet_len; | |
ef261577 | 1488 | unsigned char *tvlv_buff, *packet_buff; |
c67893d1 | 1489 | uint8_t *packet_pos; |
ef261577 | 1490 | bool ret; |
c3e29312 | 1491 | |
7e071c79 | 1492 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1493 | if (!ret) |
1494 | return NET_RX_DROP; | |
fc957275 | 1495 | |
edbf12ba ML |
1496 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1497 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1498 | */ | |
fe8bc396 | 1499 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1500 | return NET_RX_DROP; |
1501 | ||
d69909d2 SE |
1502 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1503 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1504 | skb->len + ETH_HLEN); |
1505 | ||
8780dad9 | 1506 | packet_len = skb_headlen(skb); |
7ed4be95 | 1507 | ethhdr = eth_hdr(skb); |
8780dad9 | 1508 | packet_buff = skb->data; |
96412690 | 1509 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
fc957275 ML |
1510 | |
1511 | /* unpack the aggregated packets and process them one by one */ | |
b47506d9 | 1512 | while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
ef261577 ML |
1513 | batadv_ogm_packet->tvlv_len)) { |
1514 | tvlv_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; | |
fc957275 | 1515 | |
ef261577 ML |
1516 | batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, |
1517 | tvlv_buff, if_incoming); | |
fc957275 | 1518 | |
7e071c79 | 1519 | buff_pos += BATADV_OGM_HLEN; |
ef261577 | 1520 | buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
fc957275 | 1521 | |
c67893d1 SE |
1522 | packet_pos = packet_buff + buff_pos; |
1523 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1524 | } |
c3e29312 ML |
1525 | |
1526 | kfree_skb(skb); | |
1527 | return NET_RX_SUCCESS; | |
fc957275 | 1528 | } |
1c280471 | 1529 | |
737a2a22 AQ |
1530 | /** |
1531 | * batadv_iv_ogm_orig_print - print the originator table | |
1532 | * @bat_priv: the bat priv with all the soft interface information | |
1533 | * @seq: debugfs table seq_file struct | |
1534 | */ | |
1535 | static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, | |
1536 | struct seq_file *seq) | |
1537 | { | |
1538 | struct batadv_neigh_node *neigh_node, *neigh_node_tmp; | |
1539 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1540 | int last_seen_msecs, last_seen_secs; | |
1541 | struct batadv_orig_node *orig_node; | |
1542 | unsigned long last_seen_jiffies; | |
1543 | struct hlist_head *head; | |
1544 | int batman_count = 0; | |
1545 | uint32_t i; | |
1546 | ||
1547 | seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", | |
1548 | "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, | |
1549 | "Nexthop", "outgoingIF", "Potential nexthops"); | |
1550 | ||
1551 | for (i = 0; i < hash->size; i++) { | |
1552 | head = &hash->table[i]; | |
1553 | ||
1554 | rcu_read_lock(); | |
1555 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1556 | neigh_node = batadv_orig_node_get_router(orig_node); | |
1557 | if (!neigh_node) | |
1558 | continue; | |
1559 | ||
1560 | if (neigh_node->bat_iv.tq_avg == 0) | |
1561 | goto next; | |
1562 | ||
1563 | last_seen_jiffies = jiffies - orig_node->last_seen; | |
1564 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
1565 | last_seen_secs = last_seen_msecs / 1000; | |
1566 | last_seen_msecs = last_seen_msecs % 1000; | |
1567 | ||
1568 | seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", | |
1569 | orig_node->orig, last_seen_secs, | |
1570 | last_seen_msecs, neigh_node->bat_iv.tq_avg, | |
1571 | neigh_node->addr, | |
1572 | neigh_node->if_incoming->net_dev->name); | |
1573 | ||
1574 | hlist_for_each_entry_rcu(neigh_node_tmp, | |
1575 | &orig_node->neigh_list, list) { | |
1576 | seq_printf(seq, " %pM (%3i)", | |
1577 | neigh_node_tmp->addr, | |
1578 | neigh_node_tmp->bat_iv.tq_avg); | |
1579 | } | |
1580 | ||
1581 | seq_puts(seq, "\n"); | |
1582 | batman_count++; | |
1583 | ||
1584 | next: | |
1585 | batadv_neigh_node_free_ref(neigh_node); | |
1586 | } | |
1587 | rcu_read_unlock(); | |
1588 | } | |
1589 | ||
1590 | if (batman_count == 0) | |
1591 | seq_puts(seq, "No batman nodes in range ...\n"); | |
1592 | } | |
1593 | ||
a3285a8f AQ |
1594 | /** |
1595 | * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors | |
1596 | * @neigh1: the first neighbor object of the comparison | |
1597 | * @neigh2: the second neighbor object of the comparison | |
1598 | * | |
1599 | * Returns a value less, equal to or greater than 0 if the metric via neigh1 is | |
1600 | * lower, the same as or higher than the metric via neigh2 | |
1601 | */ | |
1602 | static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, | |
1603 | struct batadv_neigh_node *neigh2) | |
1604 | { | |
1605 | uint8_t tq1, tq2; | |
1606 | ||
1607 | tq1 = neigh1->bat_iv.tq_avg; | |
1608 | tq2 = neigh2->bat_iv.tq_avg; | |
1609 | ||
1610 | return tq1 - tq2; | |
1611 | } | |
1612 | ||
c43c981e AQ |
1613 | /** |
1614 | * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than | |
1615 | * neigh2 from the metric prospective | |
1616 | * @neigh1: the first neighbor object of the comparison | |
1617 | * @neigh2: the second neighbor object of the comparison | |
1618 | * | |
1619 | * Returns true if the metric via neigh1 is equally good or better than the | |
1620 | * metric via neigh2, false otherwise. | |
1621 | */ | |
1622 | static bool batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1, | |
1623 | struct batadv_neigh_node *neigh2) | |
1624 | { | |
1625 | int diff = batadv_iv_ogm_neigh_cmp(neigh1, neigh2); | |
1626 | ||
1627 | return diff > -BATADV_TQ_SIMILARITY_THRESHOLD; | |
1628 | } | |
1629 | ||
56303d34 | 1630 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1631 | .name = "BATMAN_IV", |
fe8bc396 SE |
1632 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1633 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1634 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1635 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1636 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1637 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
a3285a8f | 1638 | .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, |
c43c981e | 1639 | .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, |
737a2a22 | 1640 | .bat_orig_print = batadv_iv_ogm_orig_print, |
d0015fdd AQ |
1641 | .bat_orig_free = batadv_iv_ogm_orig_free, |
1642 | .bat_orig_add_if = batadv_iv_ogm_orig_add_if, | |
1643 | .bat_orig_del_if = batadv_iv_ogm_orig_del_if, | |
1c280471 ML |
1644 | }; |
1645 | ||
81c524f7 | 1646 | int __init batadv_iv_init(void) |
1c280471 | 1647 | { |
c3e29312 ML |
1648 | int ret; |
1649 | ||
1650 | /* batman originator packet */ | |
acd34afa SE |
1651 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1652 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1653 | if (ret < 0) |
1654 | goto out; | |
1655 | ||
fe8bc396 | 1656 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1657 | if (ret < 0) |
1658 | goto handler_unregister; | |
1659 | ||
1660 | goto out; | |
1661 | ||
1662 | handler_unregister: | |
acd34afa | 1663 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
1664 | out: |
1665 | return ret; | |
1c280471 | 1666 | } |