Commit | Line | Data |
---|---|---|
9f6446c7 | 1 | /* Copyright (C) 2007-2015 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 | ||
1e2c2a4f | 18 | #include "bat_algo.h" |
fc957275 | 19 | #include "main.h" |
1e2c2a4f SE |
20 | |
21 | #include <linux/atomic.h> | |
22 | #include <linux/bitmap.h> | |
23 | #include <linux/bitops.h> | |
24 | #include <linux/bug.h> | |
25 | #include <linux/byteorder/generic.h> | |
26 | #include <linux/cache.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/if_ether.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/pkt_sched.h> | |
36 | #include <linux/printk.h> | |
37 | #include <linux/random.h> | |
38 | #include <linux/rculist.h> | |
39 | #include <linux/rcupdate.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/skbuff.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/spinlock.h> | |
44 | #include <linux/stddef.h> | |
45 | #include <linux/string.h> | |
46 | #include <linux/types.h> | |
47 | #include <linux/workqueue.h> | |
48 | ||
49 | #include "bitarray.h" | |
50 | #include "hard-interface.h" | |
51 | #include "hash.h" | |
52 | #include "network-coding.h" | |
fc957275 | 53 | #include "originator.h" |
1e2c2a4f | 54 | #include "packet.h" |
fc957275 | 55 | #include "routing.h" |
fc957275 | 56 | #include "send.h" |
1e2c2a4f | 57 | #include "translation-table.h" |
fc957275 | 58 | |
791c2a2d | 59 | /** |
95298a91 | 60 | * enum batadv_dup_status - duplicate status |
9f52ee19 | 61 | * @BATADV_NO_DUP: the packet is no duplicate |
791c2a2d AQ |
62 | * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the |
63 | * neighbor) | |
64 | * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor | |
65 | * @BATADV_PROTECTED: originator is currently protected (after reboot) | |
66 | */ | |
67 | enum batadv_dup_status { | |
68 | BATADV_NO_DUP = 0, | |
69 | BATADV_ORIG_DUP, | |
70 | BATADV_NEIGH_DUP, | |
71 | BATADV_PROTECTED, | |
72 | }; | |
73 | ||
24a5deeb AQ |
74 | /** |
75 | * batadv_ring_buffer_set - update the ring buffer with the given value | |
76 | * @lq_recv: pointer to the ring buffer | |
77 | * @lq_index: index to store the value at | |
78 | * @value: value to store in the ring buffer | |
79 | */ | |
80 | static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, | |
81 | uint8_t value) | |
82 | { | |
83 | lq_recv[*lq_index] = value; | |
84 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
85 | } | |
86 | ||
87 | /** | |
d491dbb6 | 88 | * batadv_ring_buffer_avg - compute the average of all non-zero values stored |
24a5deeb AQ |
89 | * in the given ring buffer |
90 | * @lq_recv: pointer to the ring buffer | |
91 | * | |
92 | * Returns computed average value. | |
93 | */ | |
94 | static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) | |
95 | { | |
96 | const uint8_t *ptr; | |
6c4a1622 MP |
97 | uint16_t count = 0; |
98 | uint16_t i = 0; | |
99 | uint16_t sum = 0; | |
24a5deeb AQ |
100 | |
101 | ptr = lq_recv; | |
102 | ||
103 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
104 | if (*ptr != 0) { | |
105 | count++; | |
106 | sum += *ptr; | |
107 | } | |
108 | ||
109 | i++; | |
110 | ptr++; | |
111 | } | |
112 | ||
113 | if (count == 0) | |
114 | return 0; | |
115 | ||
116 | return (uint8_t)(sum / count); | |
117 | } | |
d98cae64 | 118 | |
d0015fdd AQ |
119 | /** |
120 | * batadv_iv_ogm_orig_free - free the private resources allocated for this | |
121 | * orig_node | |
122 | * @orig_node: the orig_node for which the resources have to be free'd | |
123 | */ | |
124 | static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) | |
125 | { | |
126 | kfree(orig_node->bat_iv.bcast_own); | |
127 | kfree(orig_node->bat_iv.bcast_own_sum); | |
128 | } | |
129 | ||
130 | /** | |
131 | * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to | |
132 | * include the new hard-interface | |
133 | * @orig_node: the orig_node that has to be changed | |
134 | * @max_if_num: the current amount of interfaces | |
135 | * | |
136 | * Returns 0 on success, a negative error code otherwise. | |
137 | */ | |
138 | static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, | |
139 | int max_if_num) | |
140 | { | |
141 | void *data_ptr; | |
0185dda6 | 142 | size_t old_size; |
d0015fdd AQ |
143 | int ret = -ENOMEM; |
144 | ||
145 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
146 | ||
d0015fdd | 147 | old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; |
0185dda6 AQ |
148 | data_ptr = kmalloc_array(max_if_num, |
149 | BATADV_NUM_WORDS * sizeof(unsigned long), | |
150 | GFP_ATOMIC); | |
d0015fdd AQ |
151 | if (!data_ptr) |
152 | goto unlock; | |
153 | ||
154 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); | |
155 | kfree(orig_node->bat_iv.bcast_own); | |
156 | orig_node->bat_iv.bcast_own = data_ptr; | |
157 | ||
0185dda6 | 158 | data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC); |
d0015fdd AQ |
159 | if (!data_ptr) { |
160 | kfree(orig_node->bat_iv.bcast_own); | |
161 | goto unlock; | |
162 | } | |
163 | ||
164 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
165 | (max_if_num - 1) * sizeof(uint8_t)); | |
166 | kfree(orig_node->bat_iv.bcast_own_sum); | |
167 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
168 | ||
169 | ret = 0; | |
170 | ||
171 | unlock: | |
172 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
173 | ||
174 | return ret; | |
175 | } | |
176 | ||
177 | /** | |
178 | * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to | |
179 | * exclude the removed interface | |
180 | * @orig_node: the orig_node that has to be changed | |
181 | * @max_if_num: the current amount of interfaces | |
182 | * @del_if_num: the index of the interface being removed | |
183 | * | |
184 | * Returns 0 on success, a negative error code otherwise. | |
185 | */ | |
186 | static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, | |
187 | int max_if_num, int del_if_num) | |
188 | { | |
189 | int chunk_size, ret = -ENOMEM, if_offset; | |
190 | void *data_ptr = NULL; | |
191 | ||
192 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
193 | ||
194 | /* last interface was removed */ | |
195 | if (max_if_num == 0) | |
196 | goto free_bcast_own; | |
197 | ||
198 | chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; | |
0185dda6 | 199 | data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); |
d0015fdd AQ |
200 | if (!data_ptr) |
201 | goto unlock; | |
202 | ||
203 | /* copy first part */ | |
204 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); | |
205 | ||
206 | /* copy second part */ | |
207 | memcpy((char *)data_ptr + del_if_num * chunk_size, | |
208 | orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), | |
209 | (max_if_num - del_if_num) * chunk_size); | |
210 | ||
211 | free_bcast_own: | |
212 | kfree(orig_node->bat_iv.bcast_own); | |
213 | orig_node->bat_iv.bcast_own = data_ptr; | |
214 | ||
215 | if (max_if_num == 0) | |
216 | goto free_own_sum; | |
217 | ||
0185dda6 | 218 | data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC); |
d0015fdd AQ |
219 | if (!data_ptr) { |
220 | kfree(orig_node->bat_iv.bcast_own); | |
221 | goto unlock; | |
222 | } | |
223 | ||
224 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
225 | del_if_num * sizeof(uint8_t)); | |
226 | ||
227 | if_offset = (del_if_num + 1) * sizeof(uint8_t); | |
228 | memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), | |
229 | orig_node->bat_iv.bcast_own_sum + if_offset, | |
230 | (max_if_num - del_if_num) * sizeof(uint8_t)); | |
231 | ||
232 | free_own_sum: | |
233 | kfree(orig_node->bat_iv.bcast_own_sum); | |
234 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
235 | ||
236 | ret = 0; | |
237 | unlock: | |
238 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
bbad0a5e AQ |
243 | /** |
244 | * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator | |
245 | * @bat_priv: the bat priv with all the soft interface information | |
246 | * @addr: mac address of the originator | |
247 | * | |
248 | * Returns the originator object corresponding to the passed mac address or NULL | |
249 | * on failure. | |
250 | * If the object does not exists it is created an initialised. | |
251 | */ | |
252 | static struct batadv_orig_node * | |
253 | batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr) | |
254 | { | |
255 | struct batadv_orig_node *orig_node; | |
256 | int size, hash_added; | |
257 | ||
258 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
259 | if (orig_node) | |
260 | return orig_node; | |
261 | ||
262 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
263 | if (!orig_node) | |
264 | return NULL; | |
265 | ||
266 | spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); | |
267 | ||
268 | size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
269 | orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); | |
270 | if (!orig_node->bat_iv.bcast_own) | |
271 | goto free_orig_node; | |
272 | ||
273 | size = bat_priv->num_ifaces * sizeof(uint8_t); | |
274 | orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); | |
275 | if (!orig_node->bat_iv.bcast_own_sum) | |
a5a5cb8c | 276 | goto free_orig_node; |
bbad0a5e AQ |
277 | |
278 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, | |
279 | batadv_choose_orig, orig_node, | |
280 | &orig_node->hash_entry); | |
281 | if (hash_added != 0) | |
a5a5cb8c | 282 | goto free_orig_node; |
bbad0a5e AQ |
283 | |
284 | return orig_node; | |
285 | ||
bbad0a5e | 286 | free_orig_node: |
b2262df7 SW |
287 | /* free twice, as batadv_orig_node_new sets refcount to 2 */ |
288 | batadv_orig_node_free_ref(orig_node); | |
bbad0a5e AQ |
289 | batadv_orig_node_free_ref(orig_node); |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
56303d34 SE |
294 | static struct batadv_neigh_node * |
295 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
296 | const uint8_t *neigh_addr, | |
297 | struct batadv_orig_node *orig_node, | |
863dd7a8 | 298 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 299 | { |
0538f759 | 300 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
08bf0ed2 | 301 | struct batadv_neigh_node *neigh_node, *tmp_neigh_node; |
7ae8b285 | 302 | |
0538f759 | 303 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); |
7ae8b285 ML |
304 | if (!neigh_node) |
305 | goto out; | |
306 | ||
89652331 SW |
307 | if (!atomic_inc_not_zero(&hard_iface->refcount)) { |
308 | kfree(neigh_node); | |
309 | neigh_node = NULL; | |
310 | goto out; | |
311 | } | |
312 | ||
313 | neigh_node->orig_node = orig_neigh; | |
314 | neigh_node->if_incoming = hard_iface; | |
7ae8b285 | 315 | |
7ae8b285 | 316 | spin_lock_bh(&orig_node->neigh_list_lock); |
08bf0ed2 AQ |
317 | tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface, |
318 | neigh_addr); | |
319 | if (!tmp_neigh_node) { | |
320 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
321 | } else { | |
322 | kfree(neigh_node); | |
323 | batadv_hardif_free_ref(hard_iface); | |
324 | neigh_node = tmp_neigh_node; | |
325 | } | |
7ae8b285 ML |
326 | spin_unlock_bh(&orig_node->neigh_list_lock); |
327 | ||
08bf0ed2 AQ |
328 | if (!tmp_neigh_node) |
329 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
330 | "Creating new neighbor %pM for orig_node %pM on interface %s\n", | |
331 | neigh_addr, orig_node->orig, | |
332 | hard_iface->net_dev->name); | |
333 | ||
7ae8b285 ML |
334 | out: |
335 | return neigh_node; | |
336 | } | |
337 | ||
56303d34 | 338 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 339 | { |
96412690 | 340 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 341 | unsigned char *ogm_buff; |
d7d32ec0 ML |
342 | uint32_t random_seqno; |
343 | ||
344 | /* randomize initial seqno to avoid collision */ | |
345 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 346 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 347 | |
14511519 ML |
348 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
349 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
350 | if (!ogm_buff) | |
42d9f2cb | 351 | return -ENOMEM; |
77af7575 | 352 | |
14511519 ML |
353 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
354 | ||
355 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
a40d9b07 SW |
356 | batadv_ogm_packet->packet_type = BATADV_IV_OGM; |
357 | batadv_ogm_packet->version = BATADV_COMPAT_VERSION; | |
358 | batadv_ogm_packet->ttl = 2; | |
96412690 | 359 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
414254e3 | 360 | batadv_ogm_packet->reserved = 0; |
96412690 | 361 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
77af7575 | 362 | |
42d9f2cb | 363 | return 0; |
d0b9fd89 ML |
364 | } |
365 | ||
56303d34 | 366 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 367 | { |
14511519 ML |
368 | kfree(hard_iface->bat_iv.ogm_buff); |
369 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
370 | } |
371 | ||
56303d34 | 372 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 373 | { |
96412690 | 374 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 375 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 376 | |
14511519 | 377 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
8fdd0153 AQ |
378 | ether_addr_copy(batadv_ogm_packet->orig, |
379 | hard_iface->net_dev->dev_addr); | |
380 | ether_addr_copy(batadv_ogm_packet->prev_sender, | |
381 | hard_iface->net_dev->dev_addr); | |
d0b9fd89 ML |
382 | } |
383 | ||
56303d34 SE |
384 | static void |
385 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 386 | { |
96412690 | 387 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 388 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 389 | |
14511519 | 390 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 391 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
a40d9b07 | 392 | batadv_ogm_packet->ttl = BATADV_TTL; |
d0b9fd89 ML |
393 | } |
394 | ||
b9dacc52 | 395 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 396 | static unsigned long |
56303d34 | 397 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 398 | { |
42d0b044 SE |
399 | unsigned int msecs; |
400 | ||
401 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 402 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
403 | |
404 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
405 | } |
406 | ||
407 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 408 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 409 | { |
e76e4320 | 410 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
411 | } |
412 | ||
413 | /* apply hop penalty for a normal link */ | |
56303d34 SE |
414 | static uint8_t batadv_hop_penalty(uint8_t tq, |
415 | const struct batadv_priv *bat_priv) | |
b9dacc52 ML |
416 | { |
417 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
418 | int new_tq; |
419 | ||
420 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
421 | new_tq /= BATADV_TQ_MAX_VALUE; | |
422 | ||
423 | return new_tq; | |
b9dacc52 ML |
424 | } |
425 | ||
fc957275 | 426 | /* is there another aggregated packet here? */ |
9fd9b19e MP |
427 | static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
428 | __be16 tvlv_len) | |
fc957275 | 429 | { |
08c36d3e SE |
430 | int next_buff_pos = 0; |
431 | ||
7e071c79 | 432 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
ef261577 | 433 | next_buff_pos += ntohs(tvlv_len); |
fc957275 ML |
434 | |
435 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 436 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
437 | } |
438 | ||
b9dacc52 | 439 | /* send a batman ogm to a given interface */ |
56303d34 SE |
440 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
441 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 442 | { |
56303d34 | 443 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
de12baec | 444 | const char *fwd_str; |
b9dacc52 ML |
445 | uint8_t packet_num; |
446 | int16_t buff_pos; | |
96412690 | 447 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 448 | struct sk_buff *skb; |
c67893d1 | 449 | uint8_t *packet_pos; |
b9dacc52 | 450 | |
e9a4f295 | 451 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
452 | return; |
453 | ||
454 | packet_num = 0; | |
455 | buff_pos = 0; | |
c67893d1 SE |
456 | packet_pos = forw_packet->skb->data; |
457 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
458 | |
459 | /* adjust all flags and log packets */ | |
fe8bc396 | 460 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
ef261577 | 461 | batadv_ogm_packet->tvlv_len)) { |
b9dacc52 | 462 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
463 | * ordinary base packet |
464 | */ | |
8de47de5 SE |
465 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
466 | forw_packet->if_incoming == hard_iface) | |
96412690 | 467 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 468 | else |
96412690 | 469 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 470 | |
c67893d1 SE |
471 | if (packet_num > 0 || !forw_packet->own) |
472 | fwd_str = "Forwarding"; | |
473 | else | |
474 | fwd_str = "Sending own"; | |
475 | ||
39c75a51 | 476 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
e1bf0c14 | 477 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", |
1eda58bf | 478 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
96412690 SE |
479 | batadv_ogm_packet->orig, |
480 | ntohl(batadv_ogm_packet->seqno), | |
a40d9b07 | 481 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl, |
a2f2b6cd | 482 | ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? |
1eda58bf | 483 | "on" : "off"), |
e1bf0c14 | 484 | hard_iface->net_dev->name, |
1eda58bf | 485 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 486 | |
7e071c79 | 487 | buff_pos += BATADV_OGM_HLEN; |
ef261577 | 488 | buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 489 | packet_num++; |
c67893d1 SE |
490 | packet_pos = forw_packet->skb->data + buff_pos; |
491 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
492 | } |
493 | ||
494 | /* create clone because function is called more than once */ | |
495 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 496 | if (skb) { |
d69909d2 SE |
497 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
498 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 499 | skb->len + ETH_HLEN); |
3193e8fd | 500 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 501 | } |
b9dacc52 ML |
502 | } |
503 | ||
504 | /* send a batman ogm packet */ | |
56303d34 | 505 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 506 | { |
b9dacc52 | 507 | struct net_device *soft_iface; |
56303d34 SE |
508 | struct batadv_priv *bat_priv; |
509 | struct batadv_hard_iface *primary_if = NULL; | |
b9dacc52 ML |
510 | |
511 | if (!forw_packet->if_incoming) { | |
86ceb360 | 512 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
513 | goto out; |
514 | } | |
515 | ||
516 | soft_iface = forw_packet->if_incoming->soft_iface; | |
517 | bat_priv = netdev_priv(soft_iface); | |
518 | ||
ef0a937f | 519 | if (WARN_ON(!forw_packet->if_outgoing)) |
b9dacc52 ML |
520 | goto out; |
521 | ||
ef0a937f | 522 | if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) |
b9dacc52 ML |
523 | goto out; |
524 | ||
ef0a937f | 525 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 | 526 | goto out; |
b9dacc52 | 527 | |
ef0a937f SW |
528 | primary_if = batadv_primary_if_get_selected(bat_priv); |
529 | if (!primary_if) | |
530 | goto out; | |
b9dacc52 | 531 | |
ef0a937f SW |
532 | /* only for one specific outgoing interface */ |
533 | batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); | |
b9dacc52 ML |
534 | |
535 | out: | |
536 | if (primary_if) | |
e5d89254 | 537 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
538 | } |
539 | ||
ef0a937f SW |
540 | /** |
541 | * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an | |
542 | * existing forward packet | |
543 | * @new_bat_ogm_packet: OGM packet to be aggregated | |
544 | * @bat_priv: the bat priv with all the soft interface information | |
545 | * @packet_len: (total) length of the OGM | |
546 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
95298a91 | 547 | * @directlink: true if this is a direct link packet |
ef0a937f SW |
548 | * @if_incoming: interface where the packet was received |
549 | * @if_outgoing: interface for which the retransmission should be considered | |
550 | * @forw_packet: the forwarded packet which should be checked | |
551 | * | |
552 | * Returns true if new_packet can be aggregated with forw_packet | |
553 | */ | |
fe8bc396 | 554 | static bool |
96412690 | 555 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 556 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
557 | int packet_len, unsigned long send_time, |
558 | bool directlink, | |
56303d34 | 559 | const struct batadv_hard_iface *if_incoming, |
ef0a937f | 560 | const struct batadv_hard_iface *if_outgoing, |
56303d34 | 561 | const struct batadv_forw_packet *forw_packet) |
b9dacc52 | 562 | { |
96412690 | 563 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 564 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 565 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 566 | bool res = false; |
42d0b044 | 567 | unsigned long aggregation_end_time; |
b9dacc52 | 568 | |
96412690 | 569 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
570 | aggregation_end_time = send_time; |
571 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 572 | |
9cfc7bd6 | 573 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
574 | * if: |
575 | * | |
576 | * - the send time is within our MAX_AGGREGATION_MS time | |
577 | * - the resulting packet wont be bigger than | |
578 | * MAX_AGGREGATION_BYTES | |
8f34b388 | 579 | * otherwise aggregation is not possible |
b9dacc52 | 580 | */ |
8f34b388 MP |
581 | if (!time_before(send_time, forw_packet->send_time) || |
582 | !time_after_eq(aggregation_end_time, forw_packet->send_time)) | |
583 | return false; | |
584 | ||
585 | if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) | |
586 | return false; | |
587 | ||
588 | /* packet is not leaving on the same interface. */ | |
589 | if (forw_packet->if_outgoing != if_outgoing) | |
590 | return false; | |
591 | ||
592 | /* check aggregation compatibility | |
593 | * -> direct link packets are broadcasted on | |
594 | * their interface only | |
595 | * -> aggregate packet if the current packet is | |
596 | * a "global" packet as well as the base | |
597 | * packet | |
598 | */ | |
599 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
600 | if (!primary_if) | |
601 | return false; | |
ef0a937f | 602 | |
8f34b388 MP |
603 | /* packets without direct link flag and high TTL |
604 | * are flooded through the net | |
605 | */ | |
606 | if (!directlink && | |
607 | !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && | |
608 | batadv_ogm_packet->ttl != 1 && | |
609 | ||
610 | /* own packets originating non-primary | |
611 | * interfaces leave only that interface | |
612 | */ | |
613 | (!forw_packet->own || | |
614 | forw_packet->if_incoming == primary_if)) { | |
615 | res = true; | |
616 | goto out; | |
617 | } | |
b9dacc52 | 618 | |
8f34b388 MP |
619 | /* if the incoming packet is sent via this one |
620 | * interface only - we still can aggregate | |
621 | */ | |
622 | if (directlink && | |
623 | new_bat_ogm_packet->ttl == 1 && | |
624 | forw_packet->if_incoming == if_incoming && | |
625 | ||
626 | /* packets from direct neighbors or | |
627 | * own secondary interface packets | |
628 | * (= secondary interface packets in general) | |
629 | */ | |
630 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || | |
631 | (forw_packet->own && | |
632 | forw_packet->if_incoming != primary_if))) { | |
633 | res = true; | |
634 | goto out; | |
b9dacc52 ML |
635 | } |
636 | ||
637 | out: | |
638 | if (primary_if) | |
e5d89254 | 639 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
640 | return res; |
641 | } | |
642 | ||
1b371d13 SW |
643 | /** |
644 | * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this | |
ef0a937f SW |
645 | * packet to it. |
646 | * @packet_buff: pointer to the OGM | |
647 | * @packet_len: (total) length of the OGM | |
648 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
649 | * @direct_link: whether this OGM has direct link status | |
650 | * @if_incoming: interface where the packet was received | |
651 | * @if_outgoing: interface for which the retransmission should be considered | |
652 | * @own_packet: true if it is a self-generated ogm | |
653 | */ | |
fe8bc396 SE |
654 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
655 | int packet_len, unsigned long send_time, | |
656 | bool direct_link, | |
56303d34 | 657 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 658 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 659 | int own_packet) |
b9dacc52 | 660 | { |
56303d34 SE |
661 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
662 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 663 | unsigned char *skb_buff; |
42d0b044 | 664 | unsigned int skb_size; |
b9dacc52 ML |
665 | |
666 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
667 | return; | |
668 | ||
ef0a937f SW |
669 | if (!atomic_inc_not_zero(&if_outgoing->refcount)) |
670 | goto out_free_incoming; | |
671 | ||
b9dacc52 ML |
672 | /* own packet should always be scheduled */ |
673 | if (!own_packet) { | |
3e34819e | 674 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 675 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 676 | "batman packet queue full\n"); |
940d156f | 677 | goto out_free_outgoing; |
b9dacc52 ML |
678 | } |
679 | } | |
680 | ||
681 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
940d156f MP |
682 | if (!forw_packet_aggr) |
683 | goto out_nomem; | |
b9dacc52 | 684 | |
940d156f MP |
685 | if (atomic_read(&bat_priv->aggregated_ogms) && |
686 | packet_len < BATADV_MAX_AGGREGATION_BYTES) | |
5b246574 | 687 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 688 | else |
5b246574 SE |
689 | skb_size = packet_len; |
690 | ||
41ab6c48 | 691 | skb_size += ETH_HLEN; |
b9dacc52 | 692 | |
41ab6c48 | 693 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
940d156f MP |
694 | if (!forw_packet_aggr->skb) |
695 | goto out_free_forw_packet; | |
c54f38c9 | 696 | forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 697 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 698 | |
b9dacc52 ML |
699 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
700 | forw_packet_aggr->packet_len = packet_len; | |
701 | memcpy(skb_buff, packet_buff, packet_len); | |
702 | ||
703 | forw_packet_aggr->own = own_packet; | |
704 | forw_packet_aggr->if_incoming = if_incoming; | |
ef0a937f | 705 | forw_packet_aggr->if_outgoing = if_outgoing; |
b9dacc52 | 706 | forw_packet_aggr->num_packets = 0; |
42d0b044 | 707 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
708 | forw_packet_aggr->send_time = send_time; |
709 | ||
710 | /* save packet direct link flag status */ | |
711 | if (direct_link) | |
712 | forw_packet_aggr->direct_link_flags |= 1; | |
713 | ||
714 | /* add new packet to packet list */ | |
715 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
716 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
717 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
718 | ||
719 | /* start timer for this packet */ | |
720 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 721 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 722 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
723 | &forw_packet_aggr->delayed_work, |
724 | send_time - jiffies); | |
725 | ||
726 | return; | |
940d156f MP |
727 | out_free_forw_packet: |
728 | kfree(forw_packet_aggr); | |
729 | out_nomem: | |
730 | if (!own_packet) | |
731 | atomic_inc(&bat_priv->batman_queue_left); | |
732 | out_free_outgoing: | |
ef0a937f SW |
733 | batadv_hardif_free_ref(if_outgoing); |
734 | out_free_incoming: | |
e5d89254 | 735 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
736 | } |
737 | ||
738 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 739 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
740 | const unsigned char *packet_buff, |
741 | int packet_len, bool direct_link) | |
b9dacc52 ML |
742 | { |
743 | unsigned char *skb_buff; | |
8de47de5 | 744 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
745 | |
746 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
747 | memcpy(skb_buff, packet_buff, packet_len); | |
748 | forw_packet_aggr->packet_len += packet_len; | |
749 | forw_packet_aggr->num_packets++; | |
750 | ||
751 | /* save packet direct link flag status */ | |
8de47de5 SE |
752 | if (direct_link) { |
753 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
754 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
755 | } | |
b9dacc52 ML |
756 | } |
757 | ||
ef0a937f SW |
758 | /** |
759 | * batadv_iv_ogm_queue_add - queue up an OGM for transmission | |
760 | * @bat_priv: the bat priv with all the soft interface information | |
761 | * @packet_buff: pointer to the OGM | |
762 | * @packet_len: (total) length of the OGM | |
763 | * @if_incoming: interface where the packet was received | |
764 | * @if_outgoing: interface for which the retransmission should be considered | |
765 | * @own_packet: true if it is a self-generated ogm | |
766 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
767 | */ | |
56303d34 | 768 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
769 | unsigned char *packet_buff, |
770 | int packet_len, | |
56303d34 | 771 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 772 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 773 | int own_packet, unsigned long send_time) |
b9dacc52 | 774 | { |
9cfc7bd6 | 775 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
776 | * _pos -> pointer to the position in the queue |
777 | */ | |
56303d34 SE |
778 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
779 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 780 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 781 | bool direct_link; |
42d0b044 | 782 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 783 | |
96412690 | 784 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
56489151 | 785 | direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); |
42d0b044 | 786 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
787 | |
788 | /* find position for the packet in the forward queue */ | |
789 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
790 | /* own packets are not to be aggregated */ | |
56489151 | 791 | if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { |
b67bfe0d | 792 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 793 | &bat_priv->forw_bat_list, list) { |
96412690 | 794 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
795 | bat_priv, packet_len, |
796 | send_time, direct_link, | |
797 | if_incoming, | |
ef0a937f | 798 | if_outgoing, |
fe8bc396 | 799 | forw_packet_pos)) { |
b9dacc52 ML |
800 | forw_packet_aggr = forw_packet_pos; |
801 | break; | |
802 | } | |
803 | } | |
804 | } | |
805 | ||
806 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
807 | * suitable aggregation packet found |
808 | */ | |
b9dacc52 ML |
809 | if (!forw_packet_aggr) { |
810 | /* the following section can run without the lock */ | |
811 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
812 | ||
9cfc7bd6 | 813 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
814 | * we hold it back for a while, so that it might be aggregated |
815 | * later on | |
816 | */ | |
42d0b044 SE |
817 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
818 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 819 | |
fe8bc396 SE |
820 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
821 | send_time, direct_link, | |
ef0a937f SW |
822 | if_incoming, if_outgoing, |
823 | own_packet); | |
b9dacc52 | 824 | } else { |
fe8bc396 SE |
825 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
826 | packet_len, direct_link); | |
b9dacc52 ML |
827 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
828 | } | |
829 | } | |
830 | ||
56303d34 | 831 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 832 | const struct ethhdr *ethhdr, |
96412690 | 833 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
834 | bool is_single_hop_neigh, |
835 | bool is_from_best_next_hop, | |
ef0a937f SW |
836 | struct batadv_hard_iface *if_incoming, |
837 | struct batadv_hard_iface *if_outgoing) | |
b9dacc52 | 838 | { |
56303d34 | 839 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
ef261577 | 840 | uint16_t tvlv_len; |
b9dacc52 | 841 | |
a40d9b07 | 842 | if (batadv_ogm_packet->ttl <= 1) { |
39c75a51 | 843 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
844 | return; |
845 | } | |
846 | ||
13b2541b ML |
847 | if (!is_from_best_next_hop) { |
848 | /* Mark the forwarded packet when it is not coming from our | |
849 | * best next hop. We still need to forward the packet for our | |
850 | * neighbor link quality detection to work in case the packet | |
851 | * originated from a single hop neighbor. Otherwise we can | |
852 | * simply drop the ogm. | |
853 | */ | |
854 | if (is_single_hop_neigh) | |
96412690 | 855 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
856 | else |
857 | return; | |
858 | } | |
b9dacc52 | 859 | |
ef261577 | 860 | tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 861 | |
a40d9b07 | 862 | batadv_ogm_packet->ttl--; |
8fdd0153 | 863 | ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); |
b9dacc52 | 864 | |
b9dacc52 | 865 | /* apply hop penalty */ |
96412690 | 866 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 867 | bat_priv); |
b9dacc52 | 868 | |
39c75a51 | 869 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 870 | "Forwarding packet: tq: %i, ttl: %i\n", |
a40d9b07 | 871 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl); |
b9dacc52 | 872 | |
b9dacc52 | 873 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 874 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 875 | if (is_single_hop_neigh) |
96412690 | 876 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 877 | else |
96412690 | 878 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 879 | |
96412690 | 880 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
ef261577 | 881 | BATADV_OGM_HLEN + tvlv_len, |
ef0a937f SW |
882 | if_incoming, if_outgoing, 0, |
883 | batadv_iv_ogm_fwd_send_time()); | |
b9dacc52 ML |
884 | } |
885 | ||
d9896617 AQ |
886 | /** |
887 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
888 | * the given interface | |
889 | * @hard_iface: the interface for which the windows have to be shifted | |
890 | */ | |
891 | static void | |
892 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
893 | { | |
894 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
895 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
896 | struct hlist_head *head; | |
897 | struct batadv_orig_node *orig_node; | |
898 | unsigned long *word; | |
899 | uint32_t i; | |
900 | size_t word_index; | |
901 | uint8_t *w; | |
bbad0a5e | 902 | int if_num; |
d9896617 AQ |
903 | |
904 | for (i = 0; i < hash->size; i++) { | |
905 | head = &hash->table[i]; | |
906 | ||
907 | rcu_read_lock(); | |
908 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
bbad0a5e | 909 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 | 910 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
32db6aaa | 911 | word = &orig_node->bat_iv.bcast_own[word_index]; |
d9896617 AQ |
912 | |
913 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
bbad0a5e AQ |
914 | if_num = hard_iface->if_num; |
915 | w = &orig_node->bat_iv.bcast_own_sum[if_num]; | |
d9896617 | 916 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); |
bbad0a5e | 917 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 AQ |
918 | } |
919 | rcu_read_unlock(); | |
920 | } | |
921 | } | |
922 | ||
56303d34 | 923 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 924 | { |
56303d34 | 925 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 926 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 927 | struct batadv_ogm_packet *batadv_ogm_packet; |
ef0a937f | 928 | struct batadv_hard_iface *primary_if, *tmp_hard_iface; |
14511519 | 929 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
bbb1f90e | 930 | uint32_t seqno; |
ef261577 | 931 | uint16_t tvlv_len = 0; |
ef0a937f | 932 | unsigned long send_time; |
b9dacc52 | 933 | |
e5d89254 | 934 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 935 | |
e1bf0c14 ML |
936 | if (hard_iface == primary_if) { |
937 | /* tt changes have to be committed before the tvlv data is | |
938 | * appended as it may alter the tt tvlv container | |
939 | */ | |
940 | batadv_tt_local_commit_changes(bat_priv); | |
ef261577 ML |
941 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, |
942 | ogm_buff_len, | |
943 | BATADV_OGM_HLEN); | |
e1bf0c14 | 944 | } |
be9aa4c1 | 945 | |
14511519 | 946 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
ef261577 | 947 | batadv_ogm_packet->tvlv_len = htons(tvlv_len); |
b9dacc52 ML |
948 | |
949 | /* change sequence number to network order */ | |
14511519 | 950 | seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 951 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 952 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 953 | |
d9896617 | 954 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
b9dacc52 | 955 | |
ef0a937f SW |
956 | send_time = batadv_iv_ogm_emit_send_time(bat_priv); |
957 | ||
958 | if (hard_iface != primary_if) { | |
959 | /* OGMs from secondary interfaces are only scheduled on their | |
960 | * respective interfaces. | |
961 | */ | |
962 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, | |
963 | hard_iface, hard_iface, 1, send_time); | |
964 | goto out; | |
965 | } | |
966 | ||
967 | /* OGMs from primary interfaces are scheduled on all | |
968 | * interfaces. | |
969 | */ | |
970 | rcu_read_lock(); | |
971 | list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { | |
972 | if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) | |
973 | continue; | |
974 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, | |
975 | *ogm_buff_len, hard_iface, | |
976 | tmp_hard_iface, 1, send_time); | |
977 | } | |
978 | rcu_read_unlock(); | |
979 | ||
980 | out: | |
b9dacc52 | 981 | if (primary_if) |
e5d89254 | 982 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
983 | } |
984 | ||
89652331 SW |
985 | /** |
986 | * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an | |
987 | * originator | |
988 | * @bat_priv: the bat priv with all the soft interface information | |
989 | * @orig_node: the orig node who originally emitted the ogm packet | |
7351a482 | 990 | * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node |
89652331 SW |
991 | * @ethhdr: Ethernet header of the OGM |
992 | * @batadv_ogm_packet: the ogm packet | |
993 | * @if_incoming: interface where the packet was received | |
994 | * @if_outgoing: interface for which the retransmission should be considered | |
89652331 SW |
995 | * @dup_status: the duplicate status of this ogm packet. |
996 | */ | |
fe8bc396 | 997 | static void |
56303d34 SE |
998 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
999 | struct batadv_orig_node *orig_node, | |
7351a482 | 1000 | struct batadv_orig_ifinfo *orig_ifinfo, |
fe8bc396 | 1001 | const struct ethhdr *ethhdr, |
96412690 | 1002 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1003 | struct batadv_hard_iface *if_incoming, |
89652331 | 1004 | struct batadv_hard_iface *if_outgoing, |
7c24bbbe | 1005 | enum batadv_dup_status dup_status) |
fc957275 | 1006 | { |
89652331 SW |
1007 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
1008 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; | |
56303d34 SE |
1009 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
1010 | struct batadv_neigh_node *router = NULL; | |
1011 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 1012 | int if_num; |
bbb1f90e | 1013 | uint8_t sum_orig, sum_neigh; |
1eda58bf | 1014 | uint8_t *neigh_addr; |
bbb1f90e | 1015 | uint8_t tq_avg; |
fc957275 | 1016 | |
39c75a51 | 1017 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1018 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
1019 | |
1020 | rcu_read_lock(); | |
b67bfe0d | 1021 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1022 | &orig_node->neigh_list, list) { |
1eda58bf SE |
1023 | neigh_addr = tmp_neigh_node->addr; |
1024 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
1025 | tmp_neigh_node->if_incoming == if_incoming && | |
1026 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
38dc40ef | 1027 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
7d211efc | 1028 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
1029 | neigh_node = tmp_neigh_node; |
1030 | continue; | |
1031 | } | |
1032 | ||
7c24bbbe | 1033 | if (dup_status != BATADV_NO_DUP) |
fc957275 ML |
1034 | continue; |
1035 | ||
89652331 SW |
1036 | /* only update the entry for this outgoing interface */ |
1037 | neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, | |
1038 | if_outgoing); | |
1039 | if (!neigh_ifinfo) | |
1040 | continue; | |
1041 | ||
1042 | spin_lock_bh(&tmp_neigh_node->ifinfo_lock); | |
1043 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1044 | &neigh_ifinfo->bat_iv.tq_index, 0); | |
1045 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); | |
1046 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1047 | spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); | |
1048 | ||
1049 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1050 | neigh_ifinfo = NULL; | |
fc957275 ML |
1051 | } |
1052 | ||
1053 | if (!neigh_node) { | |
56303d34 | 1054 | struct batadv_orig_node *orig_tmp; |
fc957275 | 1055 | |
bbad0a5e | 1056 | orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); |
fc957275 ML |
1057 | if (!orig_tmp) |
1058 | goto unlock; | |
1059 | ||
fe8bc396 SE |
1060 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1061 | ethhdr->h_source, | |
863dd7a8 | 1062 | orig_node, orig_tmp); |
fc957275 | 1063 | |
7d211efc | 1064 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
1065 | if (!neigh_node) |
1066 | goto unlock; | |
23badd6d | 1067 | } else { |
39c75a51 | 1068 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1069 | "Updating existing last-hop neighbor of originator\n"); |
23badd6d | 1070 | } |
fc957275 ML |
1071 | |
1072 | rcu_read_unlock(); | |
89652331 SW |
1073 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1074 | if (!neigh_ifinfo) | |
1075 | goto out; | |
fc957275 | 1076 | |
d7b2a97e | 1077 | neigh_node->last_seen = jiffies; |
fc957275 | 1078 | |
89652331 SW |
1079 | spin_lock_bh(&neigh_node->ifinfo_lock); |
1080 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1081 | &neigh_ifinfo->bat_iv.tq_index, | |
96412690 | 1082 | batadv_ogm_packet->tq); |
89652331 SW |
1083 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); |
1084 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1085 | spin_unlock_bh(&neigh_node->ifinfo_lock); | |
fc957275 | 1086 | |
7c24bbbe | 1087 | if (dup_status == BATADV_NO_DUP) { |
7351a482 | 1088 | orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
89652331 | 1089 | neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
fc957275 ML |
1090 | } |
1091 | ||
fc957275 | 1092 | /* if this neighbor already is our next hop there is nothing |
9cfc7bd6 SE |
1093 | * to change |
1094 | */ | |
7351a482 | 1095 | router = batadv_orig_router_get(orig_node, if_outgoing); |
fc957275 | 1096 | if (router == neigh_node) |
e1bf0c14 | 1097 | goto out; |
fc957275 | 1098 | |
89652331 SW |
1099 | if (router) { |
1100 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
1101 | if (!router_ifinfo) | |
1102 | goto out; | |
1103 | ||
1104 | /* if this neighbor does not offer a better TQ we won't | |
1105 | * consider it | |
1106 | */ | |
1107 | if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) | |
1108 | goto out; | |
1109 | } | |
fc957275 ML |
1110 | |
1111 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
1112 | * won't consider it either |
1113 | */ | |
89652331 | 1114 | if (router_ifinfo && |
01b97a3e | 1115 | neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { |
fc957275 | 1116 | orig_node_tmp = router->orig_node; |
bbad0a5e | 1117 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1118 | if_num = router->if_incoming->if_num; |
bbad0a5e AQ |
1119 | sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1120 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 ML |
1121 | |
1122 | orig_node_tmp = neigh_node->orig_node; | |
bbad0a5e | 1123 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1124 | if_num = neigh_node->if_incoming->if_num; |
bbad0a5e AQ |
1125 | sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1126 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 | 1127 | |
bbb1f90e | 1128 | if (sum_orig >= sum_neigh) |
e1bf0c14 | 1129 | goto out; |
fc957275 ML |
1130 | } |
1131 | ||
7351a482 | 1132 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
fc957275 ML |
1133 | goto out; |
1134 | ||
1135 | unlock: | |
1136 | rcu_read_unlock(); | |
1137 | out: | |
1138 | if (neigh_node) | |
7d211efc | 1139 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 1140 | if (router) |
7d211efc | 1141 | batadv_neigh_node_free_ref(router); |
89652331 SW |
1142 | if (neigh_ifinfo) |
1143 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1144 | if (router_ifinfo) | |
1145 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
fc957275 ML |
1146 | } |
1147 | ||
89652331 SW |
1148 | /** |
1149 | * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet | |
1150 | * @orig_node: the orig node who originally emitted the ogm packet | |
1151 | * @orig_neigh_node: the orig node struct of the neighbor who sent the packet | |
1152 | * @batadv_ogm_packet: the ogm packet | |
1153 | * @if_incoming: interface where the packet was received | |
1154 | * @if_outgoing: interface for which the retransmission should be considered | |
1155 | * | |
1156 | * Returns 1 if the link can be considered bidirectional, 0 otherwise | |
1157 | */ | |
56303d34 SE |
1158 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
1159 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 1160 | struct batadv_ogm_packet *batadv_ogm_packet, |
89652331 SW |
1161 | struct batadv_hard_iface *if_incoming, |
1162 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1163 | { |
56303d34 SE |
1164 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1165 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
89652331 | 1166 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
fc957275 | 1167 | uint8_t total_count; |
42d0b044 SE |
1168 | uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
1169 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; | |
bbad0a5e | 1170 | int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; |
42d0b044 | 1171 | unsigned int combined_tq; |
c0398768 | 1172 | int tq_iface_penalty; |
fc957275 ML |
1173 | |
1174 | /* find corresponding one hop neighbor */ | |
1175 | rcu_read_lock(); | |
b67bfe0d | 1176 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1177 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
1178 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
1179 | orig_neigh_node->orig)) | |
fc957275 ML |
1180 | continue; |
1181 | ||
1182 | if (tmp_neigh_node->if_incoming != if_incoming) | |
1183 | continue; | |
1184 | ||
1185 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1186 | continue; | |
1187 | ||
1188 | neigh_node = tmp_neigh_node; | |
1189 | break; | |
1190 | } | |
1191 | rcu_read_unlock(); | |
1192 | ||
1193 | if (!neigh_node) | |
fe8bc396 SE |
1194 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1195 | orig_neigh_node->orig, | |
1196 | orig_neigh_node, | |
863dd7a8 | 1197 | orig_neigh_node); |
fc957275 ML |
1198 | |
1199 | if (!neigh_node) | |
1200 | goto out; | |
1201 | ||
d7b2a97e | 1202 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 1203 | if (orig_node == orig_neigh_node) |
d7b2a97e | 1204 | neigh_node->last_seen = jiffies; |
fc957275 | 1205 | |
d7b2a97e | 1206 | orig_node->last_seen = jiffies; |
fc957275 ML |
1207 | |
1208 | /* find packet count of corresponding one hop neighbor */ | |
bbad0a5e AQ |
1209 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
1210 | if_num = if_incoming->if_num; | |
1211 | orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
89652331 SW |
1212 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1213 | if (neigh_ifinfo) { | |
1214 | neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; | |
1215 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1216 | } else { | |
1217 | neigh_rq_count = 0; | |
1218 | } | |
bbad0a5e | 1219 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
fc957275 ML |
1220 | |
1221 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
1222 | if (orig_eq_count > neigh_rq_count) |
1223 | total_count = neigh_rq_count; | |
1224 | else | |
1225 | total_count = orig_eq_count; | |
fc957275 | 1226 | |
9cfc7bd6 SE |
1227 | /* if we have too few packets (too less data) we set tq_own to zero |
1228 | * if we receive too few packets it is not considered bidirectional | |
1229 | */ | |
42d0b044 SE |
1230 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
1231 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
1232 | tq_own = 0; |
1233 | else | |
1234 | /* neigh_node->real_packet_count is never zero as we | |
1235 | * only purge old information when getting new | |
9cfc7bd6 SE |
1236 | * information |
1237 | */ | |
42d0b044 | 1238 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 1239 | |
21a1236b | 1240 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
1241 | * affect the nearly-symmetric links only a little, but |
1242 | * punishes asymmetric links more. This will give a value | |
1243 | * between 0 and TQ_MAX_VALUE | |
1244 | */ | |
42d0b044 SE |
1245 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
1246 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
1247 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1248 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1249 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
1250 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
1251 | inv_asym_penalty /= neigh_rq_max_cube; | |
1252 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
1253 | ||
c0398768 SW |
1254 | /* penalize if the OGM is forwarded on the same interface. WiFi |
1255 | * interfaces and other half duplex devices suffer from throughput | |
1256 | * drops as they can't send and receive at the same time. | |
1257 | */ | |
1258 | tq_iface_penalty = BATADV_TQ_MAX_VALUE; | |
1259 | if (if_outgoing && (if_incoming == if_outgoing) && | |
1260 | batadv_is_wifi_netdev(if_outgoing->net_dev)) | |
1261 | tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, | |
1262 | bat_priv); | |
1263 | ||
1264 | combined_tq = batadv_ogm_packet->tq * | |
1265 | tq_own * | |
1266 | tq_asym_penalty * | |
1267 | tq_iface_penalty; | |
1268 | combined_tq /= BATADV_TQ_MAX_VALUE * | |
1269 | BATADV_TQ_MAX_VALUE * | |
1270 | BATADV_TQ_MAX_VALUE; | |
96412690 | 1271 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 1272 | |
39c75a51 | 1273 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0398768 | 1274 | "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n", |
1eda58bf | 1275 | orig_node->orig, orig_neigh_node->orig, total_count, |
c0398768 SW |
1276 | neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, |
1277 | batadv_ogm_packet->tq, if_incoming->net_dev->name, | |
1278 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); | |
fc957275 ML |
1279 | |
1280 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
1281 | * consider it bidirectional |
1282 | */ | |
96412690 | 1283 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
1284 | ret = 1; |
1285 | ||
1286 | out: | |
1287 | if (neigh_node) | |
7d211efc | 1288 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
1289 | return ret; |
1290 | } | |
1291 | ||
7c24bbbe SW |
1292 | /** |
1293 | * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, | |
1294 | * adjust the sequence number and find out whether it is a duplicate | |
1295 | * @ethhdr: ethernet header of the packet | |
1296 | * @batadv_ogm_packet: OGM packet to be considered | |
1297 | * @if_incoming: interface on which the OGM packet was received | |
89652331 | 1298 | * @if_outgoing: interface for which the retransmission should be considered |
7c24bbbe SW |
1299 | * |
1300 | * Returns duplicate status as enum batadv_dup_status | |
fc957275 | 1301 | */ |
7c24bbbe | 1302 | static enum batadv_dup_status |
fe8bc396 | 1303 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
96412690 | 1304 | const struct batadv_ogm_packet *batadv_ogm_packet, |
89652331 SW |
1305 | const struct batadv_hard_iface *if_incoming, |
1306 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1307 | { |
56303d34 SE |
1308 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1309 | struct batadv_orig_node *orig_node; | |
7351a482 | 1310 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
89652331 SW |
1311 | struct batadv_neigh_node *neigh_node; |
1312 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
7c24bbbe | 1313 | int is_dup; |
fc957275 ML |
1314 | int32_t seq_diff; |
1315 | int need_update = 0; | |
7c24bbbe SW |
1316 | int set_mark; |
1317 | enum batadv_dup_status ret = BATADV_NO_DUP; | |
96412690 | 1318 | uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
1eda58bf | 1319 | uint8_t *neigh_addr; |
bbb1f90e | 1320 | uint8_t packet_count; |
0538f759 | 1321 | unsigned long *bitmap; |
fc957275 | 1322 | |
bbad0a5e | 1323 | orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
fc957275 | 1324 | if (!orig_node) |
7c24bbbe | 1325 | return BATADV_NO_DUP; |
fc957275 | 1326 | |
7351a482 SW |
1327 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1328 | if (WARN_ON(!orig_ifinfo)) { | |
1329 | batadv_orig_node_free_ref(orig_node); | |
1330 | return 0; | |
1331 | } | |
1332 | ||
bbad0a5e | 1333 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7351a482 | 1334 | seq_diff = seqno - orig_ifinfo->last_real_seqno; |
fc957275 ML |
1335 | |
1336 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1337 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 | 1338 | batadv_window_protected(bat_priv, seq_diff, |
7351a482 | 1339 | &orig_ifinfo->batman_seqno_reset)) { |
7c24bbbe | 1340 | ret = BATADV_PROTECTED; |
fc957275 | 1341 | goto out; |
7c24bbbe | 1342 | } |
fc957275 ML |
1343 | |
1344 | rcu_read_lock(); | |
89652331 SW |
1345 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
1346 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, | |
1347 | if_outgoing); | |
1348 | if (!neigh_ifinfo) | |
1349 | continue; | |
1350 | ||
1351 | neigh_addr = neigh_node->addr; | |
1352 | is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, | |
7351a482 | 1353 | orig_ifinfo->last_real_seqno, |
7c24bbbe SW |
1354 | seqno); |
1355 | ||
1eda58bf | 1356 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
89652331 | 1357 | neigh_node->if_incoming == if_incoming) { |
fc957275 | 1358 | set_mark = 1; |
7c24bbbe SW |
1359 | if (is_dup) |
1360 | ret = BATADV_NEIGH_DUP; | |
1361 | } else { | |
fc957275 | 1362 | set_mark = 0; |
7c24bbbe SW |
1363 | if (is_dup && (ret != BATADV_NEIGH_DUP)) |
1364 | ret = BATADV_ORIG_DUP; | |
1365 | } | |
fc957275 ML |
1366 | |
1367 | /* if the window moved, set the update flag. */ | |
89652331 | 1368 | bitmap = neigh_ifinfo->bat_iv.real_bits; |
0538f759 | 1369 | need_update |= batadv_bit_get_packet(bat_priv, bitmap, |
0f5f9322 | 1370 | seq_diff, set_mark); |
fc957275 | 1371 | |
89652331 | 1372 | packet_count = bitmap_weight(bitmap, |
bbb1f90e | 1373 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
89652331 SW |
1374 | neigh_ifinfo->bat_iv.real_packet_count = packet_count; |
1375 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
fc957275 ML |
1376 | } |
1377 | rcu_read_unlock(); | |
1378 | ||
1379 | if (need_update) { | |
39c75a51 | 1380 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
7351a482 SW |
1381 | "%s updating last_seqno: old %u, new %u\n", |
1382 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", | |
1383 | orig_ifinfo->last_real_seqno, seqno); | |
1384 | orig_ifinfo->last_real_seqno = seqno; | |
fc957275 ML |
1385 | } |
1386 | ||
fc957275 | 1387 | out: |
bbad0a5e | 1388 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7d211efc | 1389 | batadv_orig_node_free_ref(orig_node); |
a0c77227 | 1390 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
fc957275 ML |
1391 | return ret; |
1392 | } | |
1393 | ||
7351a482 SW |
1394 | /** |
1395 | * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if | |
1396 | * @skb: the skb containing the OGM | |
95298a91 | 1397 | * @ogm_offset: offset from skb->data to start of ogm header |
7351a482 SW |
1398 | * @orig_node: the (cached) orig node for the originator of this OGM |
1399 | * @if_incoming: the interface where this packet was received | |
1400 | * @if_outgoing: the interface for which the packet should be considered | |
1401 | */ | |
1402 | static void | |
1403 | batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, | |
1404 | struct batadv_orig_node *orig_node, | |
1405 | struct batadv_hard_iface *if_incoming, | |
1406 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1407 | { |
56303d34 | 1408 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
56303d34 | 1409 | struct batadv_neigh_node *router = NULL, *router_router = NULL; |
7351a482 SW |
1410 | struct batadv_orig_node *orig_neigh_node; |
1411 | struct batadv_orig_ifinfo *orig_ifinfo; | |
56303d34 | 1412 | struct batadv_neigh_node *orig_neigh_router = NULL; |
89652331 | 1413 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
7351a482 | 1414 | struct batadv_ogm_packet *ogm_packet; |
7c24bbbe | 1415 | enum batadv_dup_status dup_status; |
7351a482 SW |
1416 | bool is_from_best_next_hop = false; |
1417 | bool is_single_hop_neigh = false; | |
1418 | bool sameseq, similar_ttl; | |
1419 | struct sk_buff *skb_priv; | |
1420 | struct ethhdr *ethhdr; | |
1eda58bf | 1421 | uint8_t *prev_sender; |
7351a482 | 1422 | int is_bidirect; |
fc957275 | 1423 | |
7351a482 SW |
1424 | /* create a private copy of the skb, as some functions change tq value |
1425 | * and/or flags. | |
fc957275 | 1426 | */ |
7351a482 SW |
1427 | skb_priv = skb_copy(skb, GFP_ATOMIC); |
1428 | if (!skb_priv) | |
fc957275 ML |
1429 | return; |
1430 | ||
7351a482 SW |
1431 | ethhdr = eth_hdr(skb_priv); |
1432 | ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); | |
fc957275 | 1433 | |
7351a482 SW |
1434 | dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, |
1435 | if_incoming, if_outgoing); | |
1436 | if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) | |
75cd33f8 | 1437 | is_single_hop_neigh = true; |
fc957275 | 1438 | |
7c24bbbe | 1439 | if (dup_status == BATADV_PROTECTED) { |
39c75a51 | 1440 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1441 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1442 | ethhdr->h_source); | |
fc957275 ML |
1443 | goto out; |
1444 | } | |
1445 | ||
7351a482 | 1446 | if (ogm_packet->tq == 0) { |
39c75a51 | 1447 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1448 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1449 | goto out; |
1450 | } | |
1451 | ||
7351a482 | 1452 | router = batadv_orig_router_get(orig_node, if_outgoing); |
0538f759 | 1453 | if (router) { |
7351a482 SW |
1454 | router_router = batadv_orig_router_get(router->orig_node, |
1455 | if_outgoing); | |
1456 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
0538f759 | 1457 | } |
fc957275 | 1458 | |
7351a482 | 1459 | if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && |
1eda58bf | 1460 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1461 | is_from_best_next_hop = true; |
1462 | ||
7351a482 | 1463 | prev_sender = ogm_packet->prev_sender; |
fc957275 ML |
1464 | /* avoid temporary routing loops */ |
1465 | if (router && router_router && | |
1eda58bf | 1466 | (batadv_compare_eth(router->addr, prev_sender)) && |
7351a482 | 1467 | !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && |
1eda58bf | 1468 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1469 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1470 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1471 | ethhdr->h_source); | |
fc957275 ML |
1472 | goto out; |
1473 | } | |
1474 | ||
7351a482 SW |
1475 | if (if_outgoing == BATADV_IF_DEFAULT) |
1476 | batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); | |
ef261577 | 1477 | |
fc957275 | 1478 | /* if sender is a direct neighbor the sender mac equals |
9cfc7bd6 SE |
1479 | * originator mac |
1480 | */ | |
c67893d1 SE |
1481 | if (is_single_hop_neigh) |
1482 | orig_neigh_node = orig_node; | |
1483 | else | |
bbad0a5e AQ |
1484 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
1485 | ethhdr->h_source); | |
c67893d1 | 1486 | |
fc957275 ML |
1487 | if (!orig_neigh_node) |
1488 | goto out; | |
1489 | ||
d56b1705 MH |
1490 | /* Update nc_nodes of the originator */ |
1491 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
7351a482 | 1492 | ogm_packet, is_single_hop_neigh); |
d56b1705 | 1493 | |
7351a482 SW |
1494 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
1495 | if_outgoing); | |
fc957275 ML |
1496 | |
1497 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1498 | * don't route towards it |
1499 | */ | |
fc957275 | 1500 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1501 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1502 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1503 | goto out_neigh; |
1504 | } | |
1505 | ||
fe8bc396 | 1506 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
7351a482 SW |
1507 | ogm_packet, if_incoming, |
1508 | if_outgoing); | |
fc957275 | 1509 | |
fc957275 | 1510 | /* update ranking if it is not a duplicate or has the same |
9cfc7bd6 SE |
1511 | * seqno and similar ttl as the non-duplicate |
1512 | */ | |
7351a482 SW |
1513 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1514 | if (!orig_ifinfo) | |
1515 | goto out_neigh; | |
1516 | ||
1517 | sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); | |
1518 | similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; | |
1519 | ||
7c24bbbe | 1520 | if (is_bidirect && ((dup_status == BATADV_NO_DUP) || |
7351a482 SW |
1521 | (sameseq && similar_ttl))) { |
1522 | batadv_iv_ogm_orig_update(bat_priv, orig_node, | |
1523 | orig_ifinfo, ethhdr, | |
1524 | ogm_packet, if_incoming, | |
1525 | if_outgoing, dup_status); | |
1526 | } | |
1527 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
fc957275 | 1528 | |
ef0a937f SW |
1529 | /* only forward for specific interface, not for the default one. */ |
1530 | if (if_outgoing == BATADV_IF_DEFAULT) | |
1531 | goto out_neigh; | |
1532 | ||
fc957275 ML |
1533 | /* is single hop (direct) neighbor */ |
1534 | if (is_single_hop_neigh) { | |
7351a482 SW |
1535 | /* OGMs from secondary interfaces should only scheduled once |
1536 | * per interface where it has been received, not multiple times | |
1537 | */ | |
1538 | if ((ogm_packet->ttl <= 2) && | |
1539 | (if_incoming != if_outgoing)) { | |
1540 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1541 | "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); | |
1542 | goto out_neigh; | |
1543 | } | |
fc957275 | 1544 | /* mark direct link on incoming interface */ |
7351a482 | 1545 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1546 | is_single_hop_neigh, |
ef0a937f SW |
1547 | is_from_best_next_hop, if_incoming, |
1548 | if_outgoing); | |
fc957275 | 1549 | |
39c75a51 | 1550 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1551 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1552 | goto out_neigh; |
1553 | } | |
1554 | ||
1555 | /* multihop originator */ | |
fe8bc396 | 1556 | if (!is_bidirect) { |
39c75a51 | 1557 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1558 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1559 | goto out_neigh; |
1560 | } | |
1561 | ||
7c24bbbe | 1562 | if (dup_status == BATADV_NEIGH_DUP) { |
39c75a51 | 1563 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1564 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1565 | goto out_neigh; |
1566 | } | |
1567 | ||
39c75a51 | 1568 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1569 | "Forwarding packet: rebroadcast originator packet\n"); |
7351a482 | 1570 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1571 | is_single_hop_neigh, is_from_best_next_hop, |
ef0a937f | 1572 | if_incoming, if_outgoing); |
fc957275 ML |
1573 | |
1574 | out_neigh: | |
1575 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1576 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 | 1577 | out: |
c1e517fb SW |
1578 | if (router_ifinfo) |
1579 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
fc957275 | 1580 | if (router) |
7d211efc | 1581 | batadv_neigh_node_free_ref(router); |
fc957275 | 1582 | if (router_router) |
7d211efc | 1583 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1584 | if (orig_neigh_router) |
7d211efc | 1585 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1586 | |
7351a482 SW |
1587 | kfree_skb(skb_priv); |
1588 | } | |
1589 | ||
1590 | /** | |
1591 | * batadv_iv_ogm_process - process an incoming batman iv OGM | |
1592 | * @skb: the skb containing the OGM | |
1593 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
1594 | * @if_incoming: the interface where this packet was receved | |
1595 | */ | |
1596 | static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
1597 | struct batadv_hard_iface *if_incoming) | |
1598 | { | |
1599 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1600 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
1601 | struct batadv_hard_iface *hard_iface; | |
1602 | struct batadv_ogm_packet *ogm_packet; | |
1603 | uint32_t if_incoming_seqno; | |
1604 | bool has_directlink_flag; | |
1605 | struct ethhdr *ethhdr; | |
1606 | bool is_my_oldorig = false; | |
1607 | bool is_my_addr = false; | |
1608 | bool is_my_orig = false; | |
1609 | ||
1610 | ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); | |
1611 | ethhdr = eth_hdr(skb); | |
1612 | ||
1613 | /* Silently drop when the batman packet is actually not a | |
1614 | * correct packet. | |
1615 | * | |
1616 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1617 | * minimum frame length of 64 byte) and the aggregation interprets | |
1618 | * it as an additional length. | |
1619 | * | |
1620 | * TODO: A more sane solution would be to have a bit in the | |
1621 | * batadv_ogm_packet to detect whether the packet is the last | |
1622 | * packet in an aggregation. Here we expect that the padding | |
1623 | * is always zero (or not 0x01) | |
1624 | */ | |
1625 | if (ogm_packet->packet_type != BATADV_IV_OGM) | |
1626 | return; | |
1627 | ||
1628 | /* could be changed by schedule_own_packet() */ | |
1629 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); | |
1630 | ||
1631 | if (ogm_packet->flags & BATADV_DIRECTLINK) | |
1632 | has_directlink_flag = true; | |
1633 | else | |
1634 | has_directlink_flag = false; | |
1635 | ||
1636 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1637 | "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", | |
1638 | ethhdr->h_source, if_incoming->net_dev->name, | |
1639 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
1640 | ogm_packet->prev_sender, ntohl(ogm_packet->seqno), | |
1641 | ogm_packet->tq, ogm_packet->ttl, | |
1642 | ogm_packet->version, has_directlink_flag); | |
1643 | ||
1644 | rcu_read_lock(); | |
1645 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1646 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1647 | continue; | |
1648 | ||
1649 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1650 | continue; | |
1651 | ||
1652 | if (batadv_compare_eth(ethhdr->h_source, | |
1653 | hard_iface->net_dev->dev_addr)) | |
1654 | is_my_addr = true; | |
1655 | ||
1656 | if (batadv_compare_eth(ogm_packet->orig, | |
1657 | hard_iface->net_dev->dev_addr)) | |
1658 | is_my_orig = true; | |
1659 | ||
1660 | if (batadv_compare_eth(ogm_packet->prev_sender, | |
1661 | hard_iface->net_dev->dev_addr)) | |
1662 | is_my_oldorig = true; | |
1663 | } | |
1664 | rcu_read_unlock(); | |
1665 | ||
1666 | if (is_my_addr) { | |
1667 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1668 | "Drop packet: received my own broadcast (sender: %pM)\n", | |
1669 | ethhdr->h_source); | |
1670 | return; | |
1671 | } | |
1672 | ||
1673 | if (is_my_orig) { | |
1674 | unsigned long *word; | |
1675 | int offset; | |
1676 | int32_t bit_pos; | |
1677 | int16_t if_num; | |
1678 | uint8_t *weight; | |
1679 | ||
1680 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, | |
1681 | ethhdr->h_source); | |
1682 | if (!orig_neigh_node) | |
1683 | return; | |
1684 | ||
1685 | /* neighbor has to indicate direct link and it has to | |
1686 | * come via the corresponding interface | |
1687 | * save packet seqno for bidirectional check | |
1688 | */ | |
1689 | if (has_directlink_flag && | |
1690 | batadv_compare_eth(if_incoming->net_dev->dev_addr, | |
1691 | ogm_packet->orig)) { | |
1692 | if_num = if_incoming->if_num; | |
1693 | offset = if_num * BATADV_NUM_WORDS; | |
1694 | ||
1695 | spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
32db6aaa | 1696 | word = &orig_neigh_node->bat_iv.bcast_own[offset]; |
7351a482 SW |
1697 | bit_pos = if_incoming_seqno - 2; |
1698 | bit_pos -= ntohl(ogm_packet->seqno); | |
1699 | batadv_set_bit(word, bit_pos); | |
1700 | weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
1701 | *weight = bitmap_weight(word, | |
1702 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
1703 | spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
1704 | } | |
1705 | ||
1706 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1707 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
1708 | batadv_orig_node_free_ref(orig_neigh_node); | |
1709 | return; | |
1710 | } | |
1711 | ||
1712 | if (is_my_oldorig) { | |
1713 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1714 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", | |
1715 | ethhdr->h_source); | |
1716 | return; | |
1717 | } | |
1718 | ||
1719 | if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { | |
1720 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1721 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", | |
1722 | ethhdr->h_source); | |
1723 | return; | |
1724 | } | |
1725 | ||
1726 | orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); | |
1727 | if (!orig_node) | |
1728 | return; | |
1729 | ||
1730 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, | |
1731 | if_incoming, BATADV_IF_DEFAULT); | |
1732 | ||
1733 | rcu_read_lock(); | |
1734 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1735 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1736 | continue; | |
1737 | ||
1738 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
1739 | continue; | |
1740 | ||
1741 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, | |
1742 | if_incoming, hard_iface); | |
1743 | } | |
1744 | rcu_read_unlock(); | |
1745 | ||
7d211efc | 1746 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1747 | } |
1748 | ||
fe8bc396 | 1749 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1750 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1751 | { |
56303d34 | 1752 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
7351a482 | 1753 | struct batadv_ogm_packet *ogm_packet; |
c67893d1 | 1754 | uint8_t *packet_pos; |
7351a482 | 1755 | int ogm_offset; |
ef261577 | 1756 | bool ret; |
c3e29312 | 1757 | |
7e071c79 | 1758 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1759 | if (!ret) |
1760 | return NET_RX_DROP; | |
fc957275 | 1761 | |
edbf12ba ML |
1762 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1763 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1764 | */ | |
fe8bc396 | 1765 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1766 | return NET_RX_DROP; |
1767 | ||
d69909d2 SE |
1768 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1769 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1770 | skb->len + ETH_HLEN); |
1771 | ||
7351a482 SW |
1772 | ogm_offset = 0; |
1773 | ogm_packet = (struct batadv_ogm_packet *)skb->data; | |
fc957275 ML |
1774 | |
1775 | /* unpack the aggregated packets and process them one by one */ | |
7351a482 SW |
1776 | while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
1777 | ogm_packet->tvlv_len)) { | |
1778 | batadv_iv_ogm_process(skb, ogm_offset, if_incoming); | |
fc957275 | 1779 | |
7351a482 SW |
1780 | ogm_offset += BATADV_OGM_HLEN; |
1781 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
fc957275 | 1782 | |
7351a482 SW |
1783 | packet_pos = skb->data + ogm_offset; |
1784 | ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1785 | } |
c3e29312 ML |
1786 | |
1787 | kfree_skb(skb); | |
1788 | return NET_RX_SUCCESS; | |
fc957275 | 1789 | } |
1c280471 | 1790 | |
1b371d13 SW |
1791 | /** |
1792 | * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table | |
89652331 SW |
1793 | * @orig_node: the orig_node for which the neighbors are printed |
1794 | * @if_outgoing: outgoing interface for these entries | |
1795 | * @seq: debugfs table seq_file struct | |
1796 | * | |
1797 | * Must be called while holding an rcu lock. | |
1798 | */ | |
1799 | static void | |
1800 | batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, | |
1801 | struct batadv_hard_iface *if_outgoing, | |
1802 | struct seq_file *seq) | |
1803 | { | |
1804 | struct batadv_neigh_node *neigh_node; | |
1805 | struct batadv_neigh_ifinfo *n_ifinfo; | |
1806 | ||
1807 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { | |
1808 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
1809 | if (!n_ifinfo) | |
1810 | continue; | |
1811 | ||
1812 | seq_printf(seq, " %pM (%3i)", | |
1813 | neigh_node->addr, | |
1814 | n_ifinfo->bat_iv.tq_avg); | |
1815 | ||
1816 | batadv_neigh_ifinfo_free_ref(n_ifinfo); | |
1817 | } | |
1818 | } | |
1819 | ||
737a2a22 AQ |
1820 | /** |
1821 | * batadv_iv_ogm_orig_print - print the originator table | |
1822 | * @bat_priv: the bat priv with all the soft interface information | |
1823 | * @seq: debugfs table seq_file struct | |
cb1c92ec | 1824 | * @if_outgoing: the outgoing interface for which this should be printed |
737a2a22 AQ |
1825 | */ |
1826 | static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, | |
cb1c92ec SW |
1827 | struct seq_file *seq, |
1828 | struct batadv_hard_iface *if_outgoing) | |
737a2a22 | 1829 | { |
89652331 | 1830 | struct batadv_neigh_node *neigh_node; |
737a2a22 AQ |
1831 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
1832 | int last_seen_msecs, last_seen_secs; | |
1833 | struct batadv_orig_node *orig_node; | |
89652331 | 1834 | struct batadv_neigh_ifinfo *n_ifinfo; |
737a2a22 AQ |
1835 | unsigned long last_seen_jiffies; |
1836 | struct hlist_head *head; | |
1837 | int batman_count = 0; | |
1838 | uint32_t i; | |
1839 | ||
1840 | seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", | |
1841 | "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, | |
1842 | "Nexthop", "outgoingIF", "Potential nexthops"); | |
1843 | ||
1844 | for (i = 0; i < hash->size; i++) { | |
1845 | head = &hash->table[i]; | |
1846 | ||
1847 | rcu_read_lock(); | |
1848 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
7351a482 | 1849 | neigh_node = batadv_orig_router_get(orig_node, |
cb1c92ec | 1850 | if_outgoing); |
737a2a22 AQ |
1851 | if (!neigh_node) |
1852 | continue; | |
1853 | ||
89652331 | 1854 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, |
cb1c92ec | 1855 | if_outgoing); |
89652331 SW |
1856 | if (!n_ifinfo) |
1857 | goto next; | |
1858 | ||
1859 | if (n_ifinfo->bat_iv.tq_avg == 0) | |
737a2a22 AQ |
1860 | goto next; |
1861 | ||
1862 | last_seen_jiffies = jiffies - orig_node->last_seen; | |
1863 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
1864 | last_seen_secs = last_seen_msecs / 1000; | |
1865 | last_seen_msecs = last_seen_msecs % 1000; | |
1866 | ||
1867 | seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", | |
1868 | orig_node->orig, last_seen_secs, | |
89652331 | 1869 | last_seen_msecs, n_ifinfo->bat_iv.tq_avg, |
737a2a22 AQ |
1870 | neigh_node->addr, |
1871 | neigh_node->if_incoming->net_dev->name); | |
1872 | ||
cb1c92ec SW |
1873 | batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, |
1874 | seq); | |
737a2a22 AQ |
1875 | seq_puts(seq, "\n"); |
1876 | batman_count++; | |
1877 | ||
1878 | next: | |
1879 | batadv_neigh_node_free_ref(neigh_node); | |
89652331 SW |
1880 | if (n_ifinfo) |
1881 | batadv_neigh_ifinfo_free_ref(n_ifinfo); | |
737a2a22 AQ |
1882 | } |
1883 | rcu_read_unlock(); | |
1884 | } | |
1885 | ||
1886 | if (batman_count == 0) | |
1887 | seq_puts(seq, "No batman nodes in range ...\n"); | |
1888 | } | |
1889 | ||
a3285a8f AQ |
1890 | /** |
1891 | * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors | |
1892 | * @neigh1: the first neighbor object of the comparison | |
89652331 | 1893 | * @if_outgoing1: outgoing interface for the first neighbor |
a3285a8f | 1894 | * @neigh2: the second neighbor object of the comparison |
89652331 | 1895 | * @if_outgoing2: outgoing interface for the second neighbor |
a3285a8f AQ |
1896 | * |
1897 | * Returns a value less, equal to or greater than 0 if the metric via neigh1 is | |
1898 | * lower, the same as or higher than the metric via neigh2 | |
1899 | */ | |
1900 | static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, | |
89652331 SW |
1901 | struct batadv_hard_iface *if_outgoing1, |
1902 | struct batadv_neigh_node *neigh2, | |
1903 | struct batadv_hard_iface *if_outgoing2) | |
a3285a8f | 1904 | { |
89652331 | 1905 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
a3285a8f | 1906 | uint8_t tq1, tq2; |
89652331 SW |
1907 | int diff; |
1908 | ||
1909 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); | |
1910 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
a3285a8f | 1911 | |
89652331 SW |
1912 | if (!neigh1_ifinfo || !neigh2_ifinfo) { |
1913 | diff = 0; | |
1914 | goto out; | |
1915 | } | |
a3285a8f | 1916 | |
89652331 SW |
1917 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; |
1918 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
1919 | diff = tq1 - tq2; | |
1920 | ||
1921 | out: | |
1922 | if (neigh1_ifinfo) | |
1923 | batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); | |
1924 | if (neigh2_ifinfo) | |
1925 | batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); | |
1926 | ||
1927 | return diff; | |
a3285a8f AQ |
1928 | } |
1929 | ||
c43c981e AQ |
1930 | /** |
1931 | * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than | |
1932 | * neigh2 from the metric prospective | |
1933 | * @neigh1: the first neighbor object of the comparison | |
95298a91 | 1934 | * @if_outgoing1: outgoing interface for the first neighbor |
c43c981e | 1935 | * @neigh2: the second neighbor object of the comparison |
89652331 | 1936 | * @if_outgoing2: outgoing interface for the second neighbor |
95298a91 | 1937 | * |
89652331 SW |
1938 | * Returns true if the metric via neigh1 is equally good or better than |
1939 | * the metric via neigh2, false otherwise. | |
c43c981e | 1940 | */ |
89652331 SW |
1941 | static bool |
1942 | batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1, | |
1943 | struct batadv_hard_iface *if_outgoing1, | |
1944 | struct batadv_neigh_node *neigh2, | |
1945 | struct batadv_hard_iface *if_outgoing2) | |
c43c981e | 1946 | { |
89652331 SW |
1947 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
1948 | uint8_t tq1, tq2; | |
1949 | bool ret; | |
c43c981e | 1950 | |
89652331 SW |
1951 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); |
1952 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
1953 | ||
1954 | /* we can't say that the metric is better */ | |
1955 | if (!neigh1_ifinfo || !neigh2_ifinfo) { | |
1956 | ret = false; | |
1957 | goto out; | |
1958 | } | |
1959 | ||
1960 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; | |
1961 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
1962 | ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; | |
1963 | ||
1964 | out: | |
1965 | if (neigh1_ifinfo) | |
1966 | batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); | |
1967 | if (neigh2_ifinfo) | |
1968 | batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); | |
1969 | ||
1970 | return ret; | |
c43c981e AQ |
1971 | } |
1972 | ||
56303d34 | 1973 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1974 | .name = "BATMAN_IV", |
fe8bc396 SE |
1975 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1976 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1977 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1978 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1979 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1980 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
a3285a8f | 1981 | .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, |
c43c981e | 1982 | .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, |
737a2a22 | 1983 | .bat_orig_print = batadv_iv_ogm_orig_print, |
d0015fdd AQ |
1984 | .bat_orig_free = batadv_iv_ogm_orig_free, |
1985 | .bat_orig_add_if = batadv_iv_ogm_orig_add_if, | |
1986 | .bat_orig_del_if = batadv_iv_ogm_orig_del_if, | |
1c280471 ML |
1987 | }; |
1988 | ||
81c524f7 | 1989 | int __init batadv_iv_init(void) |
1c280471 | 1990 | { |
c3e29312 ML |
1991 | int ret; |
1992 | ||
1993 | /* batman originator packet */ | |
acd34afa SE |
1994 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1995 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1996 | if (ret < 0) |
1997 | goto out; | |
1998 | ||
fe8bc396 | 1999 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
2000 | if (ret < 0) |
2001 | goto handler_unregister; | |
2002 | ||
2003 | goto out; | |
2004 | ||
2005 | handler_unregister: | |
acd34afa | 2006 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
2007 | out: |
2008 | return ret; | |
1c280471 | 2009 | } |