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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 | */ | |
6b5e971a | 80 | static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) |
24a5deeb AQ |
81 | { |
82 | lq_recv[*lq_index] = value; | |
83 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
84 | } | |
85 | ||
86 | /** | |
d491dbb6 | 87 | * batadv_ring_buffer_avg - compute the average of all non-zero values stored |
24a5deeb AQ |
88 | * in the given ring buffer |
89 | * @lq_recv: pointer to the ring buffer | |
90 | * | |
91 | * Returns computed average value. | |
92 | */ | |
6b5e971a | 93 | static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) |
24a5deeb | 94 | { |
6b5e971a SE |
95 | const u8 *ptr; |
96 | u16 count = 0; | |
97 | u16 i = 0; | |
98 | u16 sum = 0; | |
24a5deeb AQ |
99 | |
100 | ptr = lq_recv; | |
101 | ||
102 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
103 | if (*ptr != 0) { | |
104 | count++; | |
105 | sum += *ptr; | |
106 | } | |
107 | ||
108 | i++; | |
109 | ptr++; | |
110 | } | |
111 | ||
112 | if (count == 0) | |
113 | return 0; | |
114 | ||
6b5e971a | 115 | return (u8)(sum / count); |
24a5deeb | 116 | } |
d98cae64 | 117 | |
d0015fdd AQ |
118 | /** |
119 | * batadv_iv_ogm_orig_free - free the private resources allocated for this | |
120 | * orig_node | |
121 | * @orig_node: the orig_node for which the resources have to be free'd | |
122 | */ | |
123 | static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) | |
124 | { | |
125 | kfree(orig_node->bat_iv.bcast_own); | |
126 | kfree(orig_node->bat_iv.bcast_own_sum); | |
127 | } | |
128 | ||
129 | /** | |
130 | * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to | |
131 | * include the new hard-interface | |
132 | * @orig_node: the orig_node that has to be changed | |
133 | * @max_if_num: the current amount of interfaces | |
134 | * | |
135 | * Returns 0 on success, a negative error code otherwise. | |
136 | */ | |
137 | static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, | |
138 | int max_if_num) | |
139 | { | |
140 | void *data_ptr; | |
0185dda6 | 141 | size_t old_size; |
d0015fdd AQ |
142 | int ret = -ENOMEM; |
143 | ||
144 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
145 | ||
d0015fdd | 146 | old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; |
0185dda6 AQ |
147 | data_ptr = kmalloc_array(max_if_num, |
148 | BATADV_NUM_WORDS * sizeof(unsigned long), | |
149 | GFP_ATOMIC); | |
d0015fdd AQ |
150 | if (!data_ptr) |
151 | goto unlock; | |
152 | ||
153 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); | |
154 | kfree(orig_node->bat_iv.bcast_own); | |
155 | orig_node->bat_iv.bcast_own = data_ptr; | |
156 | ||
6b5e971a | 157 | data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
d0015fdd AQ |
158 | if (!data_ptr) { |
159 | kfree(orig_node->bat_iv.bcast_own); | |
160 | goto unlock; | |
161 | } | |
162 | ||
163 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
6b5e971a | 164 | (max_if_num - 1) * sizeof(u8)); |
d0015fdd AQ |
165 | kfree(orig_node->bat_iv.bcast_own_sum); |
166 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
167 | ||
168 | ret = 0; | |
169 | ||
170 | unlock: | |
171 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
176 | /** | |
177 | * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to | |
178 | * exclude the removed interface | |
179 | * @orig_node: the orig_node that has to be changed | |
180 | * @max_if_num: the current amount of interfaces | |
181 | * @del_if_num: the index of the interface being removed | |
182 | * | |
183 | * Returns 0 on success, a negative error code otherwise. | |
184 | */ | |
185 | static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, | |
186 | int max_if_num, int del_if_num) | |
187 | { | |
188 | int chunk_size, ret = -ENOMEM, if_offset; | |
189 | void *data_ptr = NULL; | |
190 | ||
191 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
192 | ||
193 | /* last interface was removed */ | |
194 | if (max_if_num == 0) | |
195 | goto free_bcast_own; | |
196 | ||
197 | chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; | |
0185dda6 | 198 | data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); |
d0015fdd AQ |
199 | if (!data_ptr) |
200 | goto unlock; | |
201 | ||
202 | /* copy first part */ | |
203 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); | |
204 | ||
205 | /* copy second part */ | |
206 | memcpy((char *)data_ptr + del_if_num * chunk_size, | |
207 | orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), | |
208 | (max_if_num - del_if_num) * chunk_size); | |
209 | ||
210 | free_bcast_own: | |
211 | kfree(orig_node->bat_iv.bcast_own); | |
212 | orig_node->bat_iv.bcast_own = data_ptr; | |
213 | ||
214 | if (max_if_num == 0) | |
215 | goto free_own_sum; | |
216 | ||
6b5e971a | 217 | data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
d0015fdd AQ |
218 | if (!data_ptr) { |
219 | kfree(orig_node->bat_iv.bcast_own); | |
220 | goto unlock; | |
221 | } | |
222 | ||
223 | memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, | |
6b5e971a | 224 | del_if_num * sizeof(u8)); |
d0015fdd | 225 | |
6b5e971a SE |
226 | if_offset = (del_if_num + 1) * sizeof(u8); |
227 | memcpy((char *)data_ptr + del_if_num * sizeof(u8), | |
d0015fdd | 228 | orig_node->bat_iv.bcast_own_sum + if_offset, |
6b5e971a | 229 | (max_if_num - del_if_num) * sizeof(u8)); |
d0015fdd AQ |
230 | |
231 | free_own_sum: | |
232 | kfree(orig_node->bat_iv.bcast_own_sum); | |
233 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
234 | ||
235 | ret = 0; | |
236 | unlock: | |
237 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
238 | ||
239 | return ret; | |
240 | } | |
241 | ||
bbad0a5e AQ |
242 | /** |
243 | * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator | |
244 | * @bat_priv: the bat priv with all the soft interface information | |
245 | * @addr: mac address of the originator | |
246 | * | |
247 | * Returns the originator object corresponding to the passed mac address or NULL | |
248 | * on failure. | |
249 | * If the object does not exists it is created an initialised. | |
250 | */ | |
251 | static struct batadv_orig_node * | |
6b5e971a | 252 | batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) |
bbad0a5e AQ |
253 | { |
254 | struct batadv_orig_node *orig_node; | |
255 | int size, hash_added; | |
256 | ||
257 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
258 | if (orig_node) | |
259 | return orig_node; | |
260 | ||
261 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
262 | if (!orig_node) | |
263 | return NULL; | |
264 | ||
265 | spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); | |
266 | ||
267 | size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
268 | orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); | |
269 | if (!orig_node->bat_iv.bcast_own) | |
270 | goto free_orig_node; | |
271 | ||
6b5e971a | 272 | size = bat_priv->num_ifaces * sizeof(u8); |
bbad0a5e AQ |
273 | orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); |
274 | if (!orig_node->bat_iv.bcast_own_sum) | |
a5a5cb8c | 275 | goto free_orig_node; |
bbad0a5e AQ |
276 | |
277 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, | |
278 | batadv_choose_orig, orig_node, | |
279 | &orig_node->hash_entry); | |
280 | if (hash_added != 0) | |
a5a5cb8c | 281 | goto free_orig_node; |
bbad0a5e AQ |
282 | |
283 | return orig_node; | |
284 | ||
bbad0a5e | 285 | free_orig_node: |
b2262df7 SW |
286 | /* free twice, as batadv_orig_node_new sets refcount to 2 */ |
287 | batadv_orig_node_free_ref(orig_node); | |
bbad0a5e AQ |
288 | batadv_orig_node_free_ref(orig_node); |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
56303d34 SE |
293 | static struct batadv_neigh_node * |
294 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
6b5e971a | 295 | const u8 *neigh_addr, |
56303d34 | 296 | struct batadv_orig_node *orig_node, |
863dd7a8 | 297 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 298 | { |
0538f759 | 299 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
08bf0ed2 | 300 | struct batadv_neigh_node *neigh_node, *tmp_neigh_node; |
7ae8b285 | 301 | |
0538f759 | 302 | neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); |
7ae8b285 ML |
303 | if (!neigh_node) |
304 | goto out; | |
305 | ||
89652331 SW |
306 | if (!atomic_inc_not_zero(&hard_iface->refcount)) { |
307 | kfree(neigh_node); | |
308 | neigh_node = NULL; | |
309 | goto out; | |
310 | } | |
311 | ||
312 | neigh_node->orig_node = orig_neigh; | |
313 | neigh_node->if_incoming = hard_iface; | |
7ae8b285 | 314 | |
7ae8b285 | 315 | spin_lock_bh(&orig_node->neigh_list_lock); |
08bf0ed2 AQ |
316 | tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface, |
317 | neigh_addr); | |
318 | if (!tmp_neigh_node) { | |
319 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
320 | } else { | |
321 | kfree(neigh_node); | |
322 | batadv_hardif_free_ref(hard_iface); | |
323 | neigh_node = tmp_neigh_node; | |
324 | } | |
7ae8b285 ML |
325 | spin_unlock_bh(&orig_node->neigh_list_lock); |
326 | ||
08bf0ed2 AQ |
327 | if (!tmp_neigh_node) |
328 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
329 | "Creating new neighbor %pM for orig_node %pM on interface %s\n", | |
330 | neigh_addr, orig_node->orig, | |
331 | hard_iface->net_dev->name); | |
332 | ||
7ae8b285 ML |
333 | out: |
334 | return neigh_node; | |
335 | } | |
336 | ||
56303d34 | 337 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 338 | { |
96412690 | 339 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 340 | unsigned char *ogm_buff; |
6b5e971a | 341 | u32 random_seqno; |
d7d32ec0 ML |
342 | |
343 | /* randomize initial seqno to avoid collision */ | |
344 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 345 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 346 | |
14511519 ML |
347 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
348 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
349 | if (!ogm_buff) | |
42d9f2cb | 350 | return -ENOMEM; |
77af7575 | 351 | |
14511519 ML |
352 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
353 | ||
354 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
a40d9b07 SW |
355 | batadv_ogm_packet->packet_type = BATADV_IV_OGM; |
356 | batadv_ogm_packet->version = BATADV_COMPAT_VERSION; | |
357 | batadv_ogm_packet->ttl = 2; | |
96412690 | 358 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
414254e3 | 359 | batadv_ogm_packet->reserved = 0; |
96412690 | 360 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
77af7575 | 361 | |
42d9f2cb | 362 | return 0; |
d0b9fd89 ML |
363 | } |
364 | ||
56303d34 | 365 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 366 | { |
14511519 ML |
367 | kfree(hard_iface->bat_iv.ogm_buff); |
368 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
369 | } |
370 | ||
56303d34 | 371 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 372 | { |
96412690 | 373 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 374 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 375 | |
14511519 | 376 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
8fdd0153 AQ |
377 | ether_addr_copy(batadv_ogm_packet->orig, |
378 | hard_iface->net_dev->dev_addr); | |
379 | ether_addr_copy(batadv_ogm_packet->prev_sender, | |
380 | hard_iface->net_dev->dev_addr); | |
d0b9fd89 ML |
381 | } |
382 | ||
56303d34 SE |
383 | static void |
384 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 385 | { |
96412690 | 386 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 387 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 388 | |
14511519 | 389 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
96412690 | 390 | batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
a40d9b07 | 391 | batadv_ogm_packet->ttl = BATADV_TTL; |
d0b9fd89 ML |
392 | } |
393 | ||
b9dacc52 | 394 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 395 | static unsigned long |
56303d34 | 396 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 397 | { |
42d0b044 SE |
398 | unsigned int msecs; |
399 | ||
400 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 401 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
402 | |
403 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
404 | } |
405 | ||
406 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 407 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 408 | { |
e76e4320 | 409 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
410 | } |
411 | ||
412 | /* apply hop penalty for a normal link */ | |
6b5e971a | 413 | static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) |
b9dacc52 ML |
414 | { |
415 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
416 | int new_tq; |
417 | ||
418 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
419 | new_tq /= BATADV_TQ_MAX_VALUE; | |
420 | ||
421 | return new_tq; | |
b9dacc52 ML |
422 | } |
423 | ||
fc957275 | 424 | /* is there another aggregated packet here? */ |
9fd9b19e MP |
425 | static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
426 | __be16 tvlv_len) | |
fc957275 | 427 | { |
08c36d3e SE |
428 | int next_buff_pos = 0; |
429 | ||
7e071c79 | 430 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
ef261577 | 431 | next_buff_pos += ntohs(tvlv_len); |
fc957275 ML |
432 | |
433 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 434 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
435 | } |
436 | ||
b9dacc52 | 437 | /* send a batman ogm to a given interface */ |
56303d34 SE |
438 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
439 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 440 | { |
56303d34 | 441 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
de12baec | 442 | const char *fwd_str; |
6b5e971a SE |
443 | u8 packet_num; |
444 | s16 buff_pos; | |
96412690 | 445 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 446 | struct sk_buff *skb; |
6b5e971a | 447 | u8 *packet_pos; |
b9dacc52 | 448 | |
e9a4f295 | 449 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
450 | return; |
451 | ||
452 | packet_num = 0; | |
453 | buff_pos = 0; | |
c67893d1 SE |
454 | packet_pos = forw_packet->skb->data; |
455 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
456 | |
457 | /* adjust all flags and log packets */ | |
fe8bc396 | 458 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
ef261577 | 459 | batadv_ogm_packet->tvlv_len)) { |
b9dacc52 | 460 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
461 | * ordinary base packet |
462 | */ | |
8de47de5 SE |
463 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
464 | forw_packet->if_incoming == hard_iface) | |
96412690 | 465 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 466 | else |
96412690 | 467 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 468 | |
c67893d1 SE |
469 | if (packet_num > 0 || !forw_packet->own) |
470 | fwd_str = "Forwarding"; | |
471 | else | |
472 | fwd_str = "Sending own"; | |
473 | ||
39c75a51 | 474 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
e1bf0c14 | 475 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", |
1eda58bf | 476 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
96412690 SE |
477 | batadv_ogm_packet->orig, |
478 | ntohl(batadv_ogm_packet->seqno), | |
a40d9b07 | 479 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl, |
a2f2b6cd | 480 | ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? |
1eda58bf | 481 | "on" : "off"), |
e1bf0c14 | 482 | hard_iface->net_dev->name, |
1eda58bf | 483 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 484 | |
7e071c79 | 485 | buff_pos += BATADV_OGM_HLEN; |
ef261577 | 486 | buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 487 | packet_num++; |
c67893d1 SE |
488 | packet_pos = forw_packet->skb->data + buff_pos; |
489 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
490 | } |
491 | ||
492 | /* create clone because function is called more than once */ | |
493 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 494 | if (skb) { |
d69909d2 SE |
495 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
496 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 497 | skb->len + ETH_HLEN); |
3193e8fd | 498 | batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
f8214865 | 499 | } |
b9dacc52 ML |
500 | } |
501 | ||
502 | /* send a batman ogm packet */ | |
56303d34 | 503 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 504 | { |
b9dacc52 | 505 | struct net_device *soft_iface; |
56303d34 SE |
506 | struct batadv_priv *bat_priv; |
507 | struct batadv_hard_iface *primary_if = NULL; | |
b9dacc52 ML |
508 | |
509 | if (!forw_packet->if_incoming) { | |
86ceb360 | 510 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
511 | goto out; |
512 | } | |
513 | ||
514 | soft_iface = forw_packet->if_incoming->soft_iface; | |
515 | bat_priv = netdev_priv(soft_iface); | |
516 | ||
ef0a937f | 517 | if (WARN_ON(!forw_packet->if_outgoing)) |
b9dacc52 ML |
518 | goto out; |
519 | ||
ef0a937f | 520 | if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) |
b9dacc52 ML |
521 | goto out; |
522 | ||
ef0a937f | 523 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 | 524 | goto out; |
b9dacc52 | 525 | |
ef0a937f SW |
526 | primary_if = batadv_primary_if_get_selected(bat_priv); |
527 | if (!primary_if) | |
528 | goto out; | |
b9dacc52 | 529 | |
ef0a937f SW |
530 | /* only for one specific outgoing interface */ |
531 | batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); | |
b9dacc52 ML |
532 | |
533 | out: | |
534 | if (primary_if) | |
e5d89254 | 535 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
536 | } |
537 | ||
ef0a937f SW |
538 | /** |
539 | * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an | |
540 | * existing forward packet | |
541 | * @new_bat_ogm_packet: OGM packet to be aggregated | |
542 | * @bat_priv: the bat priv with all the soft interface information | |
543 | * @packet_len: (total) length of the OGM | |
544 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
95298a91 | 545 | * @directlink: true if this is a direct link packet |
ef0a937f SW |
546 | * @if_incoming: interface where the packet was received |
547 | * @if_outgoing: interface for which the retransmission should be considered | |
548 | * @forw_packet: the forwarded packet which should be checked | |
549 | * | |
550 | * Returns true if new_packet can be aggregated with forw_packet | |
551 | */ | |
fe8bc396 | 552 | static bool |
96412690 | 553 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 554 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
555 | int packet_len, unsigned long send_time, |
556 | bool directlink, | |
56303d34 | 557 | const struct batadv_hard_iface *if_incoming, |
ef0a937f | 558 | const struct batadv_hard_iface *if_outgoing, |
56303d34 | 559 | const struct batadv_forw_packet *forw_packet) |
b9dacc52 | 560 | { |
96412690 | 561 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 562 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 563 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 564 | bool res = false; |
42d0b044 | 565 | unsigned long aggregation_end_time; |
b9dacc52 | 566 | |
96412690 | 567 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
568 | aggregation_end_time = send_time; |
569 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 570 | |
9cfc7bd6 | 571 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
572 | * if: |
573 | * | |
574 | * - the send time is within our MAX_AGGREGATION_MS time | |
575 | * - the resulting packet wont be bigger than | |
576 | * MAX_AGGREGATION_BYTES | |
8f34b388 | 577 | * otherwise aggregation is not possible |
b9dacc52 | 578 | */ |
8f34b388 MP |
579 | if (!time_before(send_time, forw_packet->send_time) || |
580 | !time_after_eq(aggregation_end_time, forw_packet->send_time)) | |
581 | return false; | |
582 | ||
583 | if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) | |
584 | return false; | |
585 | ||
586 | /* packet is not leaving on the same interface. */ | |
587 | if (forw_packet->if_outgoing != if_outgoing) | |
588 | return false; | |
589 | ||
590 | /* check aggregation compatibility | |
591 | * -> direct link packets are broadcasted on | |
592 | * their interface only | |
593 | * -> aggregate packet if the current packet is | |
594 | * a "global" packet as well as the base | |
595 | * packet | |
596 | */ | |
597 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
598 | if (!primary_if) | |
599 | return false; | |
ef0a937f | 600 | |
8f34b388 MP |
601 | /* packets without direct link flag and high TTL |
602 | * are flooded through the net | |
603 | */ | |
604 | if (!directlink && | |
605 | !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && | |
606 | batadv_ogm_packet->ttl != 1 && | |
607 | ||
608 | /* own packets originating non-primary | |
609 | * interfaces leave only that interface | |
610 | */ | |
611 | (!forw_packet->own || | |
612 | forw_packet->if_incoming == primary_if)) { | |
613 | res = true; | |
614 | goto out; | |
615 | } | |
b9dacc52 | 616 | |
8f34b388 MP |
617 | /* if the incoming packet is sent via this one |
618 | * interface only - we still can aggregate | |
619 | */ | |
620 | if (directlink && | |
621 | new_bat_ogm_packet->ttl == 1 && | |
622 | forw_packet->if_incoming == if_incoming && | |
623 | ||
624 | /* packets from direct neighbors or | |
625 | * own secondary interface packets | |
626 | * (= secondary interface packets in general) | |
627 | */ | |
628 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || | |
629 | (forw_packet->own && | |
630 | forw_packet->if_incoming != primary_if))) { | |
631 | res = true; | |
632 | goto out; | |
b9dacc52 ML |
633 | } |
634 | ||
635 | out: | |
636 | if (primary_if) | |
e5d89254 | 637 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
638 | return res; |
639 | } | |
640 | ||
1b371d13 SW |
641 | /** |
642 | * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this | |
ef0a937f SW |
643 | * packet to it. |
644 | * @packet_buff: pointer to the OGM | |
645 | * @packet_len: (total) length of the OGM | |
646 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
647 | * @direct_link: whether this OGM has direct link status | |
648 | * @if_incoming: interface where the packet was received | |
649 | * @if_outgoing: interface for which the retransmission should be considered | |
650 | * @own_packet: true if it is a self-generated ogm | |
651 | */ | |
fe8bc396 SE |
652 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
653 | int packet_len, unsigned long send_time, | |
654 | bool direct_link, | |
56303d34 | 655 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 656 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 657 | int own_packet) |
b9dacc52 | 658 | { |
56303d34 SE |
659 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
660 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 661 | unsigned char *skb_buff; |
42d0b044 | 662 | unsigned int skb_size; |
b9dacc52 ML |
663 | |
664 | if (!atomic_inc_not_zero(&if_incoming->refcount)) | |
665 | return; | |
666 | ||
ef0a937f SW |
667 | if (!atomic_inc_not_zero(&if_outgoing->refcount)) |
668 | goto out_free_incoming; | |
669 | ||
b9dacc52 ML |
670 | /* own packet should always be scheduled */ |
671 | if (!own_packet) { | |
3e34819e | 672 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 673 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 674 | "batman packet queue full\n"); |
940d156f | 675 | goto out_free_outgoing; |
b9dacc52 ML |
676 | } |
677 | } | |
678 | ||
679 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
940d156f MP |
680 | if (!forw_packet_aggr) |
681 | goto out_nomem; | |
b9dacc52 | 682 | |
940d156f MP |
683 | if (atomic_read(&bat_priv->aggregated_ogms) && |
684 | packet_len < BATADV_MAX_AGGREGATION_BYTES) | |
5b246574 | 685 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 686 | else |
5b246574 SE |
687 | skb_size = packet_len; |
688 | ||
41ab6c48 | 689 | skb_size += ETH_HLEN; |
b9dacc52 | 690 | |
41ab6c48 | 691 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
940d156f MP |
692 | if (!forw_packet_aggr->skb) |
693 | goto out_free_forw_packet; | |
c54f38c9 | 694 | forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 695 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 696 | |
b9dacc52 ML |
697 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
698 | forw_packet_aggr->packet_len = packet_len; | |
699 | memcpy(skb_buff, packet_buff, packet_len); | |
700 | ||
701 | forw_packet_aggr->own = own_packet; | |
702 | forw_packet_aggr->if_incoming = if_incoming; | |
ef0a937f | 703 | forw_packet_aggr->if_outgoing = if_outgoing; |
b9dacc52 | 704 | forw_packet_aggr->num_packets = 0; |
42d0b044 | 705 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
706 | forw_packet_aggr->send_time = send_time; |
707 | ||
708 | /* save packet direct link flag status */ | |
709 | if (direct_link) | |
710 | forw_packet_aggr->direct_link_flags |= 1; | |
711 | ||
712 | /* add new packet to packet list */ | |
713 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
714 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
715 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
716 | ||
717 | /* start timer for this packet */ | |
718 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 719 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 720 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
721 | &forw_packet_aggr->delayed_work, |
722 | send_time - jiffies); | |
723 | ||
724 | return; | |
940d156f MP |
725 | out_free_forw_packet: |
726 | kfree(forw_packet_aggr); | |
727 | out_nomem: | |
728 | if (!own_packet) | |
729 | atomic_inc(&bat_priv->batman_queue_left); | |
730 | out_free_outgoing: | |
ef0a937f SW |
731 | batadv_hardif_free_ref(if_outgoing); |
732 | out_free_incoming: | |
e5d89254 | 733 | batadv_hardif_free_ref(if_incoming); |
b9dacc52 ML |
734 | } |
735 | ||
736 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 737 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
738 | const unsigned char *packet_buff, |
739 | int packet_len, bool direct_link) | |
b9dacc52 ML |
740 | { |
741 | unsigned char *skb_buff; | |
8de47de5 | 742 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
743 | |
744 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
745 | memcpy(skb_buff, packet_buff, packet_len); | |
746 | forw_packet_aggr->packet_len += packet_len; | |
747 | forw_packet_aggr->num_packets++; | |
748 | ||
749 | /* save packet direct link flag status */ | |
8de47de5 SE |
750 | if (direct_link) { |
751 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
752 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
753 | } | |
b9dacc52 ML |
754 | } |
755 | ||
ef0a937f SW |
756 | /** |
757 | * batadv_iv_ogm_queue_add - queue up an OGM for transmission | |
758 | * @bat_priv: the bat priv with all the soft interface information | |
759 | * @packet_buff: pointer to the OGM | |
760 | * @packet_len: (total) length of the OGM | |
761 | * @if_incoming: interface where the packet was received | |
762 | * @if_outgoing: interface for which the retransmission should be considered | |
763 | * @own_packet: true if it is a self-generated ogm | |
764 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
765 | */ | |
56303d34 | 766 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
767 | unsigned char *packet_buff, |
768 | int packet_len, | |
56303d34 | 769 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 770 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 771 | int own_packet, unsigned long send_time) |
b9dacc52 | 772 | { |
9cfc7bd6 | 773 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
774 | * _pos -> pointer to the position in the queue |
775 | */ | |
56303d34 SE |
776 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
777 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 778 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 779 | bool direct_link; |
42d0b044 | 780 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 781 | |
96412690 | 782 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
56489151 | 783 | direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); |
42d0b044 | 784 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
785 | |
786 | /* find position for the packet in the forward queue */ | |
787 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
788 | /* own packets are not to be aggregated */ | |
56489151 | 789 | if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { |
b67bfe0d | 790 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 791 | &bat_priv->forw_bat_list, list) { |
96412690 | 792 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
793 | bat_priv, packet_len, |
794 | send_time, direct_link, | |
795 | if_incoming, | |
ef0a937f | 796 | if_outgoing, |
fe8bc396 | 797 | forw_packet_pos)) { |
b9dacc52 ML |
798 | forw_packet_aggr = forw_packet_pos; |
799 | break; | |
800 | } | |
801 | } | |
802 | } | |
803 | ||
804 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
805 | * suitable aggregation packet found |
806 | */ | |
b9dacc52 ML |
807 | if (!forw_packet_aggr) { |
808 | /* the following section can run without the lock */ | |
809 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
810 | ||
9cfc7bd6 | 811 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
812 | * we hold it back for a while, so that it might be aggregated |
813 | * later on | |
814 | */ | |
42d0b044 SE |
815 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
816 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 817 | |
fe8bc396 SE |
818 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
819 | send_time, direct_link, | |
ef0a937f SW |
820 | if_incoming, if_outgoing, |
821 | own_packet); | |
b9dacc52 | 822 | } else { |
fe8bc396 SE |
823 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
824 | packet_len, direct_link); | |
b9dacc52 ML |
825 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
826 | } | |
827 | } | |
828 | ||
56303d34 | 829 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 830 | const struct ethhdr *ethhdr, |
96412690 | 831 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
832 | bool is_single_hop_neigh, |
833 | bool is_from_best_next_hop, | |
ef0a937f SW |
834 | struct batadv_hard_iface *if_incoming, |
835 | struct batadv_hard_iface *if_outgoing) | |
b9dacc52 | 836 | { |
56303d34 | 837 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
6b5e971a | 838 | u16 tvlv_len; |
b9dacc52 | 839 | |
a40d9b07 | 840 | if (batadv_ogm_packet->ttl <= 1) { |
39c75a51 | 841 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
842 | return; |
843 | } | |
844 | ||
13b2541b ML |
845 | if (!is_from_best_next_hop) { |
846 | /* Mark the forwarded packet when it is not coming from our | |
847 | * best next hop. We still need to forward the packet for our | |
848 | * neighbor link quality detection to work in case the packet | |
849 | * originated from a single hop neighbor. Otherwise we can | |
850 | * simply drop the ogm. | |
851 | */ | |
852 | if (is_single_hop_neigh) | |
96412690 | 853 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
854 | else |
855 | return; | |
856 | } | |
b9dacc52 | 857 | |
ef261577 | 858 | tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 859 | |
a40d9b07 | 860 | batadv_ogm_packet->ttl--; |
8fdd0153 | 861 | ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); |
b9dacc52 | 862 | |
b9dacc52 | 863 | /* apply hop penalty */ |
96412690 | 864 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 865 | bat_priv); |
b9dacc52 | 866 | |
39c75a51 | 867 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 868 | "Forwarding packet: tq: %i, ttl: %i\n", |
a40d9b07 | 869 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl); |
b9dacc52 | 870 | |
b9dacc52 | 871 | /* switch of primaries first hop flag when forwarding */ |
96412690 | 872 | batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
75cd33f8 | 873 | if (is_single_hop_neigh) |
96412690 | 874 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 875 | else |
96412690 | 876 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 877 | |
96412690 | 878 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
ef261577 | 879 | BATADV_OGM_HLEN + tvlv_len, |
ef0a937f SW |
880 | if_incoming, if_outgoing, 0, |
881 | batadv_iv_ogm_fwd_send_time()); | |
b9dacc52 ML |
882 | } |
883 | ||
d9896617 AQ |
884 | /** |
885 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
886 | * the given interface | |
887 | * @hard_iface: the interface for which the windows have to be shifted | |
888 | */ | |
889 | static void | |
890 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
891 | { | |
892 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
893 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
894 | struct hlist_head *head; | |
895 | struct batadv_orig_node *orig_node; | |
896 | unsigned long *word; | |
6b5e971a | 897 | u32 i; |
d9896617 | 898 | size_t word_index; |
6b5e971a | 899 | u8 *w; |
bbad0a5e | 900 | int if_num; |
d9896617 AQ |
901 | |
902 | for (i = 0; i < hash->size; i++) { | |
903 | head = &hash->table[i]; | |
904 | ||
905 | rcu_read_lock(); | |
906 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
bbad0a5e | 907 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 | 908 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
32db6aaa | 909 | word = &orig_node->bat_iv.bcast_own[word_index]; |
d9896617 AQ |
910 | |
911 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
bbad0a5e AQ |
912 | if_num = hard_iface->if_num; |
913 | w = &orig_node->bat_iv.bcast_own_sum[if_num]; | |
d9896617 | 914 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); |
bbad0a5e | 915 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 AQ |
916 | } |
917 | rcu_read_unlock(); | |
918 | } | |
919 | } | |
920 | ||
56303d34 | 921 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 922 | { |
56303d34 | 923 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 924 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 925 | struct batadv_ogm_packet *batadv_ogm_packet; |
ef0a937f | 926 | struct batadv_hard_iface *primary_if, *tmp_hard_iface; |
14511519 | 927 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
6b5e971a SE |
928 | u32 seqno; |
929 | u16 tvlv_len = 0; | |
ef0a937f | 930 | unsigned long send_time; |
b9dacc52 | 931 | |
e5d89254 | 932 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 933 | |
e1bf0c14 ML |
934 | if (hard_iface == primary_if) { |
935 | /* tt changes have to be committed before the tvlv data is | |
936 | * appended as it may alter the tt tvlv container | |
937 | */ | |
938 | batadv_tt_local_commit_changes(bat_priv); | |
ef261577 ML |
939 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, |
940 | ogm_buff_len, | |
941 | BATADV_OGM_HLEN); | |
e1bf0c14 | 942 | } |
be9aa4c1 | 943 | |
14511519 | 944 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
ef261577 | 945 | batadv_ogm_packet->tvlv_len = htons(tvlv_len); |
b9dacc52 ML |
946 | |
947 | /* change sequence number to network order */ | |
6b5e971a | 948 | seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 949 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 950 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 951 | |
d9896617 | 952 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
b9dacc52 | 953 | |
ef0a937f SW |
954 | send_time = batadv_iv_ogm_emit_send_time(bat_priv); |
955 | ||
956 | if (hard_iface != primary_if) { | |
957 | /* OGMs from secondary interfaces are only scheduled on their | |
958 | * respective interfaces. | |
959 | */ | |
960 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, | |
961 | hard_iface, hard_iface, 1, send_time); | |
962 | goto out; | |
963 | } | |
964 | ||
965 | /* OGMs from primary interfaces are scheduled on all | |
966 | * interfaces. | |
967 | */ | |
968 | rcu_read_lock(); | |
969 | list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { | |
970 | if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) | |
971 | continue; | |
972 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, | |
973 | *ogm_buff_len, hard_iface, | |
974 | tmp_hard_iface, 1, send_time); | |
975 | } | |
976 | rcu_read_unlock(); | |
977 | ||
978 | out: | |
b9dacc52 | 979 | if (primary_if) |
e5d89254 | 980 | batadv_hardif_free_ref(primary_if); |
b9dacc52 ML |
981 | } |
982 | ||
89652331 SW |
983 | /** |
984 | * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an | |
985 | * originator | |
986 | * @bat_priv: the bat priv with all the soft interface information | |
987 | * @orig_node: the orig node who originally emitted the ogm packet | |
7351a482 | 988 | * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node |
89652331 SW |
989 | * @ethhdr: Ethernet header of the OGM |
990 | * @batadv_ogm_packet: the ogm packet | |
991 | * @if_incoming: interface where the packet was received | |
992 | * @if_outgoing: interface for which the retransmission should be considered | |
89652331 SW |
993 | * @dup_status: the duplicate status of this ogm packet. |
994 | */ | |
fe8bc396 | 995 | static void |
56303d34 SE |
996 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
997 | struct batadv_orig_node *orig_node, | |
7351a482 | 998 | struct batadv_orig_ifinfo *orig_ifinfo, |
fe8bc396 | 999 | const struct ethhdr *ethhdr, |
96412690 | 1000 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1001 | struct batadv_hard_iface *if_incoming, |
89652331 | 1002 | struct batadv_hard_iface *if_outgoing, |
7c24bbbe | 1003 | enum batadv_dup_status dup_status) |
fc957275 | 1004 | { |
89652331 SW |
1005 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
1006 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; | |
56303d34 SE |
1007 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
1008 | struct batadv_neigh_node *router = NULL; | |
1009 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 1010 | int if_num; |
6b5e971a SE |
1011 | u8 sum_orig, sum_neigh; |
1012 | u8 *neigh_addr; | |
1013 | u8 tq_avg; | |
fc957275 | 1014 | |
39c75a51 | 1015 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1016 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
1017 | |
1018 | rcu_read_lock(); | |
b67bfe0d | 1019 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1020 | &orig_node->neigh_list, list) { |
1eda58bf SE |
1021 | neigh_addr = tmp_neigh_node->addr; |
1022 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
1023 | tmp_neigh_node->if_incoming == if_incoming && | |
1024 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
38dc40ef | 1025 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
7d211efc | 1026 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
1027 | neigh_node = tmp_neigh_node; |
1028 | continue; | |
1029 | } | |
1030 | ||
7c24bbbe | 1031 | if (dup_status != BATADV_NO_DUP) |
fc957275 ML |
1032 | continue; |
1033 | ||
89652331 SW |
1034 | /* only update the entry for this outgoing interface */ |
1035 | neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, | |
1036 | if_outgoing); | |
1037 | if (!neigh_ifinfo) | |
1038 | continue; | |
1039 | ||
1040 | spin_lock_bh(&tmp_neigh_node->ifinfo_lock); | |
1041 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1042 | &neigh_ifinfo->bat_iv.tq_index, 0); | |
1043 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); | |
1044 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1045 | spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); | |
1046 | ||
1047 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1048 | neigh_ifinfo = NULL; | |
fc957275 ML |
1049 | } |
1050 | ||
1051 | if (!neigh_node) { | |
56303d34 | 1052 | struct batadv_orig_node *orig_tmp; |
fc957275 | 1053 | |
bbad0a5e | 1054 | orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); |
fc957275 ML |
1055 | if (!orig_tmp) |
1056 | goto unlock; | |
1057 | ||
fe8bc396 SE |
1058 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1059 | ethhdr->h_source, | |
863dd7a8 | 1060 | orig_node, orig_tmp); |
fc957275 | 1061 | |
7d211efc | 1062 | batadv_orig_node_free_ref(orig_tmp); |
fc957275 ML |
1063 | if (!neigh_node) |
1064 | goto unlock; | |
23badd6d | 1065 | } else { |
39c75a51 | 1066 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1067 | "Updating existing last-hop neighbor of originator\n"); |
23badd6d | 1068 | } |
fc957275 ML |
1069 | |
1070 | rcu_read_unlock(); | |
89652331 SW |
1071 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1072 | if (!neigh_ifinfo) | |
1073 | goto out; | |
fc957275 | 1074 | |
d7b2a97e | 1075 | neigh_node->last_seen = jiffies; |
fc957275 | 1076 | |
89652331 SW |
1077 | spin_lock_bh(&neigh_node->ifinfo_lock); |
1078 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1079 | &neigh_ifinfo->bat_iv.tq_index, | |
96412690 | 1080 | batadv_ogm_packet->tq); |
89652331 SW |
1081 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); |
1082 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1083 | spin_unlock_bh(&neigh_node->ifinfo_lock); | |
fc957275 | 1084 | |
7c24bbbe | 1085 | if (dup_status == BATADV_NO_DUP) { |
7351a482 | 1086 | orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
89652331 | 1087 | neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
fc957275 ML |
1088 | } |
1089 | ||
fc957275 | 1090 | /* if this neighbor already is our next hop there is nothing |
9cfc7bd6 SE |
1091 | * to change |
1092 | */ | |
7351a482 | 1093 | router = batadv_orig_router_get(orig_node, if_outgoing); |
fc957275 | 1094 | if (router == neigh_node) |
e1bf0c14 | 1095 | goto out; |
fc957275 | 1096 | |
89652331 SW |
1097 | if (router) { |
1098 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
1099 | if (!router_ifinfo) | |
1100 | goto out; | |
1101 | ||
1102 | /* if this neighbor does not offer a better TQ we won't | |
1103 | * consider it | |
1104 | */ | |
1105 | if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) | |
1106 | goto out; | |
1107 | } | |
fc957275 ML |
1108 | |
1109 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
1110 | * won't consider it either |
1111 | */ | |
89652331 | 1112 | if (router_ifinfo && |
01b97a3e | 1113 | neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { |
fc957275 | 1114 | orig_node_tmp = router->orig_node; |
bbad0a5e | 1115 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1116 | if_num = router->if_incoming->if_num; |
bbad0a5e AQ |
1117 | sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1118 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 ML |
1119 | |
1120 | orig_node_tmp = neigh_node->orig_node; | |
bbad0a5e | 1121 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1122 | if_num = neigh_node->if_incoming->if_num; |
bbad0a5e AQ |
1123 | sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1124 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 | 1125 | |
bbb1f90e | 1126 | if (sum_orig >= sum_neigh) |
e1bf0c14 | 1127 | goto out; |
fc957275 ML |
1128 | } |
1129 | ||
7351a482 | 1130 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
fc957275 ML |
1131 | goto out; |
1132 | ||
1133 | unlock: | |
1134 | rcu_read_unlock(); | |
1135 | out: | |
1136 | if (neigh_node) | |
7d211efc | 1137 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 | 1138 | if (router) |
7d211efc | 1139 | batadv_neigh_node_free_ref(router); |
89652331 SW |
1140 | if (neigh_ifinfo) |
1141 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1142 | if (router_ifinfo) | |
1143 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
fc957275 ML |
1144 | } |
1145 | ||
89652331 SW |
1146 | /** |
1147 | * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet | |
1148 | * @orig_node: the orig node who originally emitted the ogm packet | |
1149 | * @orig_neigh_node: the orig node struct of the neighbor who sent the packet | |
1150 | * @batadv_ogm_packet: the ogm packet | |
1151 | * @if_incoming: interface where the packet was received | |
1152 | * @if_outgoing: interface for which the retransmission should be considered | |
1153 | * | |
1154 | * Returns 1 if the link can be considered bidirectional, 0 otherwise | |
1155 | */ | |
56303d34 SE |
1156 | static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
1157 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 1158 | struct batadv_ogm_packet *batadv_ogm_packet, |
89652331 SW |
1159 | struct batadv_hard_iface *if_incoming, |
1160 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1161 | { |
56303d34 SE |
1162 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1163 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
89652331 | 1164 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
6b5e971a SE |
1165 | u8 total_count; |
1166 | u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; | |
42d0b044 | 1167 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; |
bbad0a5e | 1168 | int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; |
42d0b044 | 1169 | unsigned int combined_tq; |
c0398768 | 1170 | int tq_iface_penalty; |
fc957275 ML |
1171 | |
1172 | /* find corresponding one hop neighbor */ | |
1173 | rcu_read_lock(); | |
b67bfe0d | 1174 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1175 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
1176 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
1177 | orig_neigh_node->orig)) | |
fc957275 ML |
1178 | continue; |
1179 | ||
1180 | if (tmp_neigh_node->if_incoming != if_incoming) | |
1181 | continue; | |
1182 | ||
1183 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1184 | continue; | |
1185 | ||
1186 | neigh_node = tmp_neigh_node; | |
1187 | break; | |
1188 | } | |
1189 | rcu_read_unlock(); | |
1190 | ||
1191 | if (!neigh_node) | |
fe8bc396 SE |
1192 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1193 | orig_neigh_node->orig, | |
1194 | orig_neigh_node, | |
863dd7a8 | 1195 | orig_neigh_node); |
fc957275 ML |
1196 | |
1197 | if (!neigh_node) | |
1198 | goto out; | |
1199 | ||
d7b2a97e | 1200 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 1201 | if (orig_node == orig_neigh_node) |
d7b2a97e | 1202 | neigh_node->last_seen = jiffies; |
fc957275 | 1203 | |
d7b2a97e | 1204 | orig_node->last_seen = jiffies; |
fc957275 ML |
1205 | |
1206 | /* find packet count of corresponding one hop neighbor */ | |
bbad0a5e AQ |
1207 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
1208 | if_num = if_incoming->if_num; | |
1209 | orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
89652331 SW |
1210 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1211 | if (neigh_ifinfo) { | |
1212 | neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; | |
1213 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
1214 | } else { | |
1215 | neigh_rq_count = 0; | |
1216 | } | |
bbad0a5e | 1217 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
fc957275 ML |
1218 | |
1219 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
1220 | if (orig_eq_count > neigh_rq_count) |
1221 | total_count = neigh_rq_count; | |
1222 | else | |
1223 | total_count = orig_eq_count; | |
fc957275 | 1224 | |
9cfc7bd6 SE |
1225 | /* if we have too few packets (too less data) we set tq_own to zero |
1226 | * if we receive too few packets it is not considered bidirectional | |
1227 | */ | |
42d0b044 SE |
1228 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
1229 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
1230 | tq_own = 0; |
1231 | else | |
1232 | /* neigh_node->real_packet_count is never zero as we | |
1233 | * only purge old information when getting new | |
9cfc7bd6 SE |
1234 | * information |
1235 | */ | |
42d0b044 | 1236 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 1237 | |
21a1236b | 1238 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
1239 | * affect the nearly-symmetric links only a little, but |
1240 | * punishes asymmetric links more. This will give a value | |
1241 | * between 0 and TQ_MAX_VALUE | |
1242 | */ | |
42d0b044 SE |
1243 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
1244 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
1245 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1246 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1247 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
1248 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
1249 | inv_asym_penalty /= neigh_rq_max_cube; | |
1250 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
1251 | ||
c0398768 SW |
1252 | /* penalize if the OGM is forwarded on the same interface. WiFi |
1253 | * interfaces and other half duplex devices suffer from throughput | |
1254 | * drops as they can't send and receive at the same time. | |
1255 | */ | |
1256 | tq_iface_penalty = BATADV_TQ_MAX_VALUE; | |
1257 | if (if_outgoing && (if_incoming == if_outgoing) && | |
1258 | batadv_is_wifi_netdev(if_outgoing->net_dev)) | |
1259 | tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, | |
1260 | bat_priv); | |
1261 | ||
1262 | combined_tq = batadv_ogm_packet->tq * | |
1263 | tq_own * | |
1264 | tq_asym_penalty * | |
1265 | tq_iface_penalty; | |
1266 | combined_tq /= BATADV_TQ_MAX_VALUE * | |
1267 | BATADV_TQ_MAX_VALUE * | |
1268 | BATADV_TQ_MAX_VALUE; | |
96412690 | 1269 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 1270 | |
39c75a51 | 1271 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0398768 | 1272 | "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 | 1273 | orig_node->orig, orig_neigh_node->orig, total_count, |
c0398768 SW |
1274 | neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, |
1275 | batadv_ogm_packet->tq, if_incoming->net_dev->name, | |
1276 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); | |
fc957275 ML |
1277 | |
1278 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
1279 | * consider it bidirectional |
1280 | */ | |
96412690 | 1281 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
fc957275 ML |
1282 | ret = 1; |
1283 | ||
1284 | out: | |
1285 | if (neigh_node) | |
7d211efc | 1286 | batadv_neigh_node_free_ref(neigh_node); |
fc957275 ML |
1287 | return ret; |
1288 | } | |
1289 | ||
7c24bbbe SW |
1290 | /** |
1291 | * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, | |
1292 | * adjust the sequence number and find out whether it is a duplicate | |
1293 | * @ethhdr: ethernet header of the packet | |
1294 | * @batadv_ogm_packet: OGM packet to be considered | |
1295 | * @if_incoming: interface on which the OGM packet was received | |
89652331 | 1296 | * @if_outgoing: interface for which the retransmission should be considered |
7c24bbbe SW |
1297 | * |
1298 | * Returns duplicate status as enum batadv_dup_status | |
fc957275 | 1299 | */ |
7c24bbbe | 1300 | static enum batadv_dup_status |
fe8bc396 | 1301 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
96412690 | 1302 | const struct batadv_ogm_packet *batadv_ogm_packet, |
89652331 SW |
1303 | const struct batadv_hard_iface *if_incoming, |
1304 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1305 | { |
56303d34 SE |
1306 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1307 | struct batadv_orig_node *orig_node; | |
7351a482 | 1308 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
89652331 SW |
1309 | struct batadv_neigh_node *neigh_node; |
1310 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
7c24bbbe | 1311 | int is_dup; |
6b5e971a | 1312 | s32 seq_diff; |
fc957275 | 1313 | int need_update = 0; |
7c24bbbe SW |
1314 | int set_mark; |
1315 | enum batadv_dup_status ret = BATADV_NO_DUP; | |
6b5e971a SE |
1316 | u32 seqno = ntohl(batadv_ogm_packet->seqno); |
1317 | u8 *neigh_addr; | |
1318 | u8 packet_count; | |
0538f759 | 1319 | unsigned long *bitmap; |
fc957275 | 1320 | |
bbad0a5e | 1321 | orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
fc957275 | 1322 | if (!orig_node) |
7c24bbbe | 1323 | return BATADV_NO_DUP; |
fc957275 | 1324 | |
7351a482 SW |
1325 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1326 | if (WARN_ON(!orig_ifinfo)) { | |
1327 | batadv_orig_node_free_ref(orig_node); | |
1328 | return 0; | |
1329 | } | |
1330 | ||
bbad0a5e | 1331 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7351a482 | 1332 | seq_diff = seqno - orig_ifinfo->last_real_seqno; |
fc957275 ML |
1333 | |
1334 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1335 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 | 1336 | batadv_window_protected(bat_priv, seq_diff, |
7351a482 | 1337 | &orig_ifinfo->batman_seqno_reset)) { |
7c24bbbe | 1338 | ret = BATADV_PROTECTED; |
fc957275 | 1339 | goto out; |
7c24bbbe | 1340 | } |
fc957275 ML |
1341 | |
1342 | rcu_read_lock(); | |
89652331 SW |
1343 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
1344 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, | |
1345 | if_outgoing); | |
1346 | if (!neigh_ifinfo) | |
1347 | continue; | |
1348 | ||
1349 | neigh_addr = neigh_node->addr; | |
1350 | is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, | |
7351a482 | 1351 | orig_ifinfo->last_real_seqno, |
7c24bbbe SW |
1352 | seqno); |
1353 | ||
1eda58bf | 1354 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
89652331 | 1355 | neigh_node->if_incoming == if_incoming) { |
fc957275 | 1356 | set_mark = 1; |
7c24bbbe SW |
1357 | if (is_dup) |
1358 | ret = BATADV_NEIGH_DUP; | |
1359 | } else { | |
fc957275 | 1360 | set_mark = 0; |
7c24bbbe SW |
1361 | if (is_dup && (ret != BATADV_NEIGH_DUP)) |
1362 | ret = BATADV_ORIG_DUP; | |
1363 | } | |
fc957275 ML |
1364 | |
1365 | /* if the window moved, set the update flag. */ | |
89652331 | 1366 | bitmap = neigh_ifinfo->bat_iv.real_bits; |
0538f759 | 1367 | need_update |= batadv_bit_get_packet(bat_priv, bitmap, |
0f5f9322 | 1368 | seq_diff, set_mark); |
fc957275 | 1369 | |
89652331 | 1370 | packet_count = bitmap_weight(bitmap, |
bbb1f90e | 1371 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
89652331 SW |
1372 | neigh_ifinfo->bat_iv.real_packet_count = packet_count; |
1373 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
fc957275 ML |
1374 | } |
1375 | rcu_read_unlock(); | |
1376 | ||
1377 | if (need_update) { | |
39c75a51 | 1378 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
7351a482 SW |
1379 | "%s updating last_seqno: old %u, new %u\n", |
1380 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", | |
1381 | orig_ifinfo->last_real_seqno, seqno); | |
1382 | orig_ifinfo->last_real_seqno = seqno; | |
fc957275 ML |
1383 | } |
1384 | ||
fc957275 | 1385 | out: |
bbad0a5e | 1386 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7d211efc | 1387 | batadv_orig_node_free_ref(orig_node); |
a0c77227 | 1388 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
fc957275 ML |
1389 | return ret; |
1390 | } | |
1391 | ||
7351a482 SW |
1392 | /** |
1393 | * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if | |
1394 | * @skb: the skb containing the OGM | |
95298a91 | 1395 | * @ogm_offset: offset from skb->data to start of ogm header |
7351a482 SW |
1396 | * @orig_node: the (cached) orig node for the originator of this OGM |
1397 | * @if_incoming: the interface where this packet was received | |
1398 | * @if_outgoing: the interface for which the packet should be considered | |
1399 | */ | |
1400 | static void | |
1401 | batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, | |
1402 | struct batadv_orig_node *orig_node, | |
1403 | struct batadv_hard_iface *if_incoming, | |
1404 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1405 | { |
56303d34 | 1406 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
56303d34 | 1407 | struct batadv_neigh_node *router = NULL, *router_router = NULL; |
7351a482 SW |
1408 | struct batadv_orig_node *orig_neigh_node; |
1409 | struct batadv_orig_ifinfo *orig_ifinfo; | |
56303d34 | 1410 | struct batadv_neigh_node *orig_neigh_router = NULL; |
89652331 | 1411 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
7351a482 | 1412 | struct batadv_ogm_packet *ogm_packet; |
7c24bbbe | 1413 | enum batadv_dup_status dup_status; |
7351a482 SW |
1414 | bool is_from_best_next_hop = false; |
1415 | bool is_single_hop_neigh = false; | |
1416 | bool sameseq, similar_ttl; | |
1417 | struct sk_buff *skb_priv; | |
1418 | struct ethhdr *ethhdr; | |
6b5e971a | 1419 | u8 *prev_sender; |
7351a482 | 1420 | int is_bidirect; |
fc957275 | 1421 | |
7351a482 SW |
1422 | /* create a private copy of the skb, as some functions change tq value |
1423 | * and/or flags. | |
fc957275 | 1424 | */ |
7351a482 SW |
1425 | skb_priv = skb_copy(skb, GFP_ATOMIC); |
1426 | if (!skb_priv) | |
fc957275 ML |
1427 | return; |
1428 | ||
7351a482 SW |
1429 | ethhdr = eth_hdr(skb_priv); |
1430 | ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); | |
fc957275 | 1431 | |
7351a482 SW |
1432 | dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, |
1433 | if_incoming, if_outgoing); | |
1434 | if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) | |
75cd33f8 | 1435 | is_single_hop_neigh = true; |
fc957275 | 1436 | |
7c24bbbe | 1437 | if (dup_status == BATADV_PROTECTED) { |
39c75a51 | 1438 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1439 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1440 | ethhdr->h_source); | |
fc957275 ML |
1441 | goto out; |
1442 | } | |
1443 | ||
7351a482 | 1444 | if (ogm_packet->tq == 0) { |
39c75a51 | 1445 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1446 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1447 | goto out; |
1448 | } | |
1449 | ||
7351a482 | 1450 | router = batadv_orig_router_get(orig_node, if_outgoing); |
0538f759 | 1451 | if (router) { |
7351a482 SW |
1452 | router_router = batadv_orig_router_get(router->orig_node, |
1453 | if_outgoing); | |
1454 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
0538f759 | 1455 | } |
fc957275 | 1456 | |
7351a482 | 1457 | if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && |
1eda58bf | 1458 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1459 | is_from_best_next_hop = true; |
1460 | ||
7351a482 | 1461 | prev_sender = ogm_packet->prev_sender; |
fc957275 ML |
1462 | /* avoid temporary routing loops */ |
1463 | if (router && router_router && | |
1eda58bf | 1464 | (batadv_compare_eth(router->addr, prev_sender)) && |
7351a482 | 1465 | !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && |
1eda58bf | 1466 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1467 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1468 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1469 | ethhdr->h_source); | |
fc957275 ML |
1470 | goto out; |
1471 | } | |
1472 | ||
7351a482 SW |
1473 | if (if_outgoing == BATADV_IF_DEFAULT) |
1474 | batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); | |
ef261577 | 1475 | |
fc957275 | 1476 | /* if sender is a direct neighbor the sender mac equals |
9cfc7bd6 SE |
1477 | * originator mac |
1478 | */ | |
c67893d1 SE |
1479 | if (is_single_hop_neigh) |
1480 | orig_neigh_node = orig_node; | |
1481 | else | |
bbad0a5e AQ |
1482 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
1483 | ethhdr->h_source); | |
c67893d1 | 1484 | |
fc957275 ML |
1485 | if (!orig_neigh_node) |
1486 | goto out; | |
1487 | ||
d56b1705 MH |
1488 | /* Update nc_nodes of the originator */ |
1489 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
7351a482 | 1490 | ogm_packet, is_single_hop_neigh); |
d56b1705 | 1491 | |
7351a482 SW |
1492 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
1493 | if_outgoing); | |
fc957275 ML |
1494 | |
1495 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1496 | * don't route towards it |
1497 | */ | |
fc957275 | 1498 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1499 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1500 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1501 | goto out_neigh; |
1502 | } | |
1503 | ||
fe8bc396 | 1504 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
7351a482 SW |
1505 | ogm_packet, if_incoming, |
1506 | if_outgoing); | |
fc957275 | 1507 | |
fc957275 | 1508 | /* update ranking if it is not a duplicate or has the same |
9cfc7bd6 SE |
1509 | * seqno and similar ttl as the non-duplicate |
1510 | */ | |
7351a482 SW |
1511 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1512 | if (!orig_ifinfo) | |
1513 | goto out_neigh; | |
1514 | ||
1515 | sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); | |
1516 | similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; | |
1517 | ||
7c24bbbe | 1518 | if (is_bidirect && ((dup_status == BATADV_NO_DUP) || |
7351a482 SW |
1519 | (sameseq && similar_ttl))) { |
1520 | batadv_iv_ogm_orig_update(bat_priv, orig_node, | |
1521 | orig_ifinfo, ethhdr, | |
1522 | ogm_packet, if_incoming, | |
1523 | if_outgoing, dup_status); | |
1524 | } | |
1525 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
fc957275 | 1526 | |
ef0a937f SW |
1527 | /* only forward for specific interface, not for the default one. */ |
1528 | if (if_outgoing == BATADV_IF_DEFAULT) | |
1529 | goto out_neigh; | |
1530 | ||
fc957275 ML |
1531 | /* is single hop (direct) neighbor */ |
1532 | if (is_single_hop_neigh) { | |
7351a482 SW |
1533 | /* OGMs from secondary interfaces should only scheduled once |
1534 | * per interface where it has been received, not multiple times | |
1535 | */ | |
1536 | if ((ogm_packet->ttl <= 2) && | |
1537 | (if_incoming != if_outgoing)) { | |
1538 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1539 | "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); | |
1540 | goto out_neigh; | |
1541 | } | |
fc957275 | 1542 | /* mark direct link on incoming interface */ |
7351a482 | 1543 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1544 | is_single_hop_neigh, |
ef0a937f SW |
1545 | is_from_best_next_hop, if_incoming, |
1546 | if_outgoing); | |
fc957275 | 1547 | |
39c75a51 | 1548 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1549 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1550 | goto out_neigh; |
1551 | } | |
1552 | ||
1553 | /* multihop originator */ | |
fe8bc396 | 1554 | if (!is_bidirect) { |
39c75a51 | 1555 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1556 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1557 | goto out_neigh; |
1558 | } | |
1559 | ||
7c24bbbe | 1560 | if (dup_status == BATADV_NEIGH_DUP) { |
39c75a51 | 1561 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1562 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1563 | goto out_neigh; |
1564 | } | |
1565 | ||
39c75a51 | 1566 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1567 | "Forwarding packet: rebroadcast originator packet\n"); |
7351a482 | 1568 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1569 | is_single_hop_neigh, is_from_best_next_hop, |
ef0a937f | 1570 | if_incoming, if_outgoing); |
fc957275 ML |
1571 | |
1572 | out_neigh: | |
1573 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
7d211efc | 1574 | batadv_orig_node_free_ref(orig_neigh_node); |
fc957275 | 1575 | out: |
c1e517fb SW |
1576 | if (router_ifinfo) |
1577 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
fc957275 | 1578 | if (router) |
7d211efc | 1579 | batadv_neigh_node_free_ref(router); |
fc957275 | 1580 | if (router_router) |
7d211efc | 1581 | batadv_neigh_node_free_ref(router_router); |
fc957275 | 1582 | if (orig_neigh_router) |
7d211efc | 1583 | batadv_neigh_node_free_ref(orig_neigh_router); |
fc957275 | 1584 | |
7351a482 SW |
1585 | kfree_skb(skb_priv); |
1586 | } | |
1587 | ||
1588 | /** | |
1589 | * batadv_iv_ogm_process - process an incoming batman iv OGM | |
1590 | * @skb: the skb containing the OGM | |
1591 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
1592 | * @if_incoming: the interface where this packet was receved | |
1593 | */ | |
1594 | static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
1595 | struct batadv_hard_iface *if_incoming) | |
1596 | { | |
1597 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1598 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
1599 | struct batadv_hard_iface *hard_iface; | |
1600 | struct batadv_ogm_packet *ogm_packet; | |
6b5e971a | 1601 | u32 if_incoming_seqno; |
7351a482 SW |
1602 | bool has_directlink_flag; |
1603 | struct ethhdr *ethhdr; | |
1604 | bool is_my_oldorig = false; | |
1605 | bool is_my_addr = false; | |
1606 | bool is_my_orig = false; | |
1607 | ||
1608 | ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); | |
1609 | ethhdr = eth_hdr(skb); | |
1610 | ||
1611 | /* Silently drop when the batman packet is actually not a | |
1612 | * correct packet. | |
1613 | * | |
1614 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1615 | * minimum frame length of 64 byte) and the aggregation interprets | |
1616 | * it as an additional length. | |
1617 | * | |
1618 | * TODO: A more sane solution would be to have a bit in the | |
1619 | * batadv_ogm_packet to detect whether the packet is the last | |
1620 | * packet in an aggregation. Here we expect that the padding | |
1621 | * is always zero (or not 0x01) | |
1622 | */ | |
1623 | if (ogm_packet->packet_type != BATADV_IV_OGM) | |
1624 | return; | |
1625 | ||
1626 | /* could be changed by schedule_own_packet() */ | |
1627 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); | |
1628 | ||
1629 | if (ogm_packet->flags & BATADV_DIRECTLINK) | |
1630 | has_directlink_flag = true; | |
1631 | else | |
1632 | has_directlink_flag = false; | |
1633 | ||
1634 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1635 | "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", | |
1636 | ethhdr->h_source, if_incoming->net_dev->name, | |
1637 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
1638 | ogm_packet->prev_sender, ntohl(ogm_packet->seqno), | |
1639 | ogm_packet->tq, ogm_packet->ttl, | |
1640 | ogm_packet->version, has_directlink_flag); | |
1641 | ||
1642 | rcu_read_lock(); | |
1643 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1644 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1645 | continue; | |
1646 | ||
1647 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1648 | continue; | |
1649 | ||
1650 | if (batadv_compare_eth(ethhdr->h_source, | |
1651 | hard_iface->net_dev->dev_addr)) | |
1652 | is_my_addr = true; | |
1653 | ||
1654 | if (batadv_compare_eth(ogm_packet->orig, | |
1655 | hard_iface->net_dev->dev_addr)) | |
1656 | is_my_orig = true; | |
1657 | ||
1658 | if (batadv_compare_eth(ogm_packet->prev_sender, | |
1659 | hard_iface->net_dev->dev_addr)) | |
1660 | is_my_oldorig = true; | |
1661 | } | |
1662 | rcu_read_unlock(); | |
1663 | ||
1664 | if (is_my_addr) { | |
1665 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1666 | "Drop packet: received my own broadcast (sender: %pM)\n", | |
1667 | ethhdr->h_source); | |
1668 | return; | |
1669 | } | |
1670 | ||
1671 | if (is_my_orig) { | |
1672 | unsigned long *word; | |
1673 | int offset; | |
6b5e971a SE |
1674 | s32 bit_pos; |
1675 | s16 if_num; | |
1676 | u8 *weight; | |
7351a482 SW |
1677 | |
1678 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, | |
1679 | ethhdr->h_source); | |
1680 | if (!orig_neigh_node) | |
1681 | return; | |
1682 | ||
1683 | /* neighbor has to indicate direct link and it has to | |
1684 | * come via the corresponding interface | |
1685 | * save packet seqno for bidirectional check | |
1686 | */ | |
1687 | if (has_directlink_flag && | |
1688 | batadv_compare_eth(if_incoming->net_dev->dev_addr, | |
1689 | ogm_packet->orig)) { | |
1690 | if_num = if_incoming->if_num; | |
1691 | offset = if_num * BATADV_NUM_WORDS; | |
1692 | ||
1693 | spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
32db6aaa | 1694 | word = &orig_neigh_node->bat_iv.bcast_own[offset]; |
7351a482 SW |
1695 | bit_pos = if_incoming_seqno - 2; |
1696 | bit_pos -= ntohl(ogm_packet->seqno); | |
1697 | batadv_set_bit(word, bit_pos); | |
1698 | weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
1699 | *weight = bitmap_weight(word, | |
1700 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
1701 | spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
1702 | } | |
1703 | ||
1704 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1705 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
1706 | batadv_orig_node_free_ref(orig_neigh_node); | |
1707 | return; | |
1708 | } | |
1709 | ||
1710 | if (is_my_oldorig) { | |
1711 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1712 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", | |
1713 | ethhdr->h_source); | |
1714 | return; | |
1715 | } | |
1716 | ||
1717 | if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { | |
1718 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1719 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", | |
1720 | ethhdr->h_source); | |
1721 | return; | |
1722 | } | |
1723 | ||
1724 | orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); | |
1725 | if (!orig_node) | |
1726 | return; | |
1727 | ||
1728 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, | |
1729 | if_incoming, BATADV_IF_DEFAULT); | |
1730 | ||
1731 | rcu_read_lock(); | |
1732 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1733 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1734 | continue; | |
1735 | ||
1736 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
1737 | continue; | |
1738 | ||
1739 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, | |
1740 | if_incoming, hard_iface); | |
1741 | } | |
1742 | rcu_read_unlock(); | |
1743 | ||
7d211efc | 1744 | batadv_orig_node_free_ref(orig_node); |
fc957275 ML |
1745 | } |
1746 | ||
fe8bc396 | 1747 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1748 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1749 | { |
56303d34 | 1750 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
7351a482 | 1751 | struct batadv_ogm_packet *ogm_packet; |
6b5e971a | 1752 | u8 *packet_pos; |
7351a482 | 1753 | int ogm_offset; |
ef261577 | 1754 | bool ret; |
c3e29312 | 1755 | |
7e071c79 | 1756 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1757 | if (!ret) |
1758 | return NET_RX_DROP; | |
fc957275 | 1759 | |
edbf12ba ML |
1760 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1761 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1762 | */ | |
fe8bc396 | 1763 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1764 | return NET_RX_DROP; |
1765 | ||
d69909d2 SE |
1766 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1767 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1768 | skb->len + ETH_HLEN); |
1769 | ||
7351a482 SW |
1770 | ogm_offset = 0; |
1771 | ogm_packet = (struct batadv_ogm_packet *)skb->data; | |
fc957275 ML |
1772 | |
1773 | /* unpack the aggregated packets and process them one by one */ | |
7351a482 SW |
1774 | while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
1775 | ogm_packet->tvlv_len)) { | |
1776 | batadv_iv_ogm_process(skb, ogm_offset, if_incoming); | |
fc957275 | 1777 | |
7351a482 SW |
1778 | ogm_offset += BATADV_OGM_HLEN; |
1779 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
fc957275 | 1780 | |
7351a482 SW |
1781 | packet_pos = skb->data + ogm_offset; |
1782 | ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1783 | } |
c3e29312 ML |
1784 | |
1785 | kfree_skb(skb); | |
1786 | return NET_RX_SUCCESS; | |
fc957275 | 1787 | } |
1c280471 | 1788 | |
1b371d13 SW |
1789 | /** |
1790 | * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table | |
89652331 SW |
1791 | * @orig_node: the orig_node for which the neighbors are printed |
1792 | * @if_outgoing: outgoing interface for these entries | |
1793 | * @seq: debugfs table seq_file struct | |
1794 | * | |
1795 | * Must be called while holding an rcu lock. | |
1796 | */ | |
1797 | static void | |
1798 | batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, | |
1799 | struct batadv_hard_iface *if_outgoing, | |
1800 | struct seq_file *seq) | |
1801 | { | |
1802 | struct batadv_neigh_node *neigh_node; | |
1803 | struct batadv_neigh_ifinfo *n_ifinfo; | |
1804 | ||
1805 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { | |
1806 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
1807 | if (!n_ifinfo) | |
1808 | continue; | |
1809 | ||
1810 | seq_printf(seq, " %pM (%3i)", | |
1811 | neigh_node->addr, | |
1812 | n_ifinfo->bat_iv.tq_avg); | |
1813 | ||
1814 | batadv_neigh_ifinfo_free_ref(n_ifinfo); | |
1815 | } | |
1816 | } | |
1817 | ||
737a2a22 AQ |
1818 | /** |
1819 | * batadv_iv_ogm_orig_print - print the originator table | |
1820 | * @bat_priv: the bat priv with all the soft interface information | |
1821 | * @seq: debugfs table seq_file struct | |
cb1c92ec | 1822 | * @if_outgoing: the outgoing interface for which this should be printed |
737a2a22 AQ |
1823 | */ |
1824 | static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, | |
cb1c92ec SW |
1825 | struct seq_file *seq, |
1826 | struct batadv_hard_iface *if_outgoing) | |
737a2a22 | 1827 | { |
89652331 | 1828 | struct batadv_neigh_node *neigh_node; |
737a2a22 AQ |
1829 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
1830 | int last_seen_msecs, last_seen_secs; | |
1831 | struct batadv_orig_node *orig_node; | |
89652331 | 1832 | struct batadv_neigh_ifinfo *n_ifinfo; |
737a2a22 AQ |
1833 | unsigned long last_seen_jiffies; |
1834 | struct hlist_head *head; | |
1835 | int batman_count = 0; | |
6b5e971a | 1836 | u32 i; |
737a2a22 AQ |
1837 | |
1838 | seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", | |
1839 | "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, | |
1840 | "Nexthop", "outgoingIF", "Potential nexthops"); | |
1841 | ||
1842 | for (i = 0; i < hash->size; i++) { | |
1843 | head = &hash->table[i]; | |
1844 | ||
1845 | rcu_read_lock(); | |
1846 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
7351a482 | 1847 | neigh_node = batadv_orig_router_get(orig_node, |
cb1c92ec | 1848 | if_outgoing); |
737a2a22 AQ |
1849 | if (!neigh_node) |
1850 | continue; | |
1851 | ||
89652331 | 1852 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, |
cb1c92ec | 1853 | if_outgoing); |
89652331 SW |
1854 | if (!n_ifinfo) |
1855 | goto next; | |
1856 | ||
1857 | if (n_ifinfo->bat_iv.tq_avg == 0) | |
737a2a22 AQ |
1858 | goto next; |
1859 | ||
1860 | last_seen_jiffies = jiffies - orig_node->last_seen; | |
1861 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
1862 | last_seen_secs = last_seen_msecs / 1000; | |
1863 | last_seen_msecs = last_seen_msecs % 1000; | |
1864 | ||
1865 | seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", | |
1866 | orig_node->orig, last_seen_secs, | |
89652331 | 1867 | last_seen_msecs, n_ifinfo->bat_iv.tq_avg, |
737a2a22 AQ |
1868 | neigh_node->addr, |
1869 | neigh_node->if_incoming->net_dev->name); | |
1870 | ||
cb1c92ec SW |
1871 | batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, |
1872 | seq); | |
737a2a22 AQ |
1873 | seq_puts(seq, "\n"); |
1874 | batman_count++; | |
1875 | ||
1876 | next: | |
1877 | batadv_neigh_node_free_ref(neigh_node); | |
89652331 SW |
1878 | if (n_ifinfo) |
1879 | batadv_neigh_ifinfo_free_ref(n_ifinfo); | |
737a2a22 AQ |
1880 | } |
1881 | rcu_read_unlock(); | |
1882 | } | |
1883 | ||
1884 | if (batman_count == 0) | |
1885 | seq_puts(seq, "No batman nodes in range ...\n"); | |
1886 | } | |
1887 | ||
a3285a8f AQ |
1888 | /** |
1889 | * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors | |
1890 | * @neigh1: the first neighbor object of the comparison | |
89652331 | 1891 | * @if_outgoing1: outgoing interface for the first neighbor |
a3285a8f | 1892 | * @neigh2: the second neighbor object of the comparison |
89652331 | 1893 | * @if_outgoing2: outgoing interface for the second neighbor |
a3285a8f AQ |
1894 | * |
1895 | * Returns a value less, equal to or greater than 0 if the metric via neigh1 is | |
1896 | * lower, the same as or higher than the metric via neigh2 | |
1897 | */ | |
1898 | static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, | |
89652331 SW |
1899 | struct batadv_hard_iface *if_outgoing1, |
1900 | struct batadv_neigh_node *neigh2, | |
1901 | struct batadv_hard_iface *if_outgoing2) | |
a3285a8f | 1902 | { |
89652331 | 1903 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
6b5e971a | 1904 | u8 tq1, tq2; |
89652331 SW |
1905 | int diff; |
1906 | ||
1907 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); | |
1908 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
a3285a8f | 1909 | |
89652331 SW |
1910 | if (!neigh1_ifinfo || !neigh2_ifinfo) { |
1911 | diff = 0; | |
1912 | goto out; | |
1913 | } | |
a3285a8f | 1914 | |
89652331 SW |
1915 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; |
1916 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
1917 | diff = tq1 - tq2; | |
1918 | ||
1919 | out: | |
1920 | if (neigh1_ifinfo) | |
1921 | batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); | |
1922 | if (neigh2_ifinfo) | |
1923 | batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); | |
1924 | ||
1925 | return diff; | |
a3285a8f AQ |
1926 | } |
1927 | ||
c43c981e AQ |
1928 | /** |
1929 | * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than | |
1930 | * neigh2 from the metric prospective | |
1931 | * @neigh1: the first neighbor object of the comparison | |
95298a91 | 1932 | * @if_outgoing1: outgoing interface for the first neighbor |
c43c981e | 1933 | * @neigh2: the second neighbor object of the comparison |
89652331 | 1934 | * @if_outgoing2: outgoing interface for the second neighbor |
95298a91 | 1935 | * |
89652331 SW |
1936 | * Returns true if the metric via neigh1 is equally good or better than |
1937 | * the metric via neigh2, false otherwise. | |
c43c981e | 1938 | */ |
89652331 SW |
1939 | static bool |
1940 | batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1, | |
1941 | struct batadv_hard_iface *if_outgoing1, | |
1942 | struct batadv_neigh_node *neigh2, | |
1943 | struct batadv_hard_iface *if_outgoing2) | |
c43c981e | 1944 | { |
89652331 | 1945 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
6b5e971a | 1946 | u8 tq1, tq2; |
89652331 | 1947 | bool ret; |
c43c981e | 1948 | |
89652331 SW |
1949 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); |
1950 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
1951 | ||
1952 | /* we can't say that the metric is better */ | |
1953 | if (!neigh1_ifinfo || !neigh2_ifinfo) { | |
1954 | ret = false; | |
1955 | goto out; | |
1956 | } | |
1957 | ||
1958 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; | |
1959 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
1960 | ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; | |
1961 | ||
1962 | out: | |
1963 | if (neigh1_ifinfo) | |
1964 | batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); | |
1965 | if (neigh2_ifinfo) | |
1966 | batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); | |
1967 | ||
1968 | return ret; | |
c43c981e AQ |
1969 | } |
1970 | ||
56303d34 | 1971 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 1972 | .name = "BATMAN_IV", |
fe8bc396 SE |
1973 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
1974 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
1975 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
1976 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
1977 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
1978 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
a3285a8f | 1979 | .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, |
c43c981e | 1980 | .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, |
737a2a22 | 1981 | .bat_orig_print = batadv_iv_ogm_orig_print, |
d0015fdd AQ |
1982 | .bat_orig_free = batadv_iv_ogm_orig_free, |
1983 | .bat_orig_add_if = batadv_iv_ogm_orig_add_if, | |
1984 | .bat_orig_del_if = batadv_iv_ogm_orig_del_if, | |
1c280471 ML |
1985 | }; |
1986 | ||
81c524f7 | 1987 | int __init batadv_iv_init(void) |
1c280471 | 1988 | { |
c3e29312 ML |
1989 | int ret; |
1990 | ||
1991 | /* batman originator packet */ | |
acd34afa SE |
1992 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
1993 | batadv_iv_ogm_receive); | |
c3e29312 ML |
1994 | if (ret < 0) |
1995 | goto out; | |
1996 | ||
fe8bc396 | 1997 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
1998 | if (ret < 0) |
1999 | goto handler_unregister; | |
2000 | ||
2001 | goto out; | |
2002 | ||
2003 | handler_unregister: | |
acd34afa | 2004 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
2005 | out: |
2006 | return ret; | |
1c280471 | 2007 | } |