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0046b040 | 1 | /* Copyright (C) 2007-2016 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> | |
77ae32e8 | 34 | #include <linux/kref.h> |
64ae7445 | 35 | #include <linux/lockdep.h> |
1e2c2a4f SE |
36 | #include <linux/netdevice.h> |
37 | #include <linux/pkt_sched.h> | |
38 | #include <linux/printk.h> | |
39 | #include <linux/random.h> | |
40 | #include <linux/rculist.h> | |
41 | #include <linux/rcupdate.h> | |
42 | #include <linux/seq_file.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/stddef.h> | |
47 | #include <linux/string.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/workqueue.h> | |
50 | ||
51 | #include "bitarray.h" | |
52 | #include "hard-interface.h" | |
53 | #include "hash.h" | |
54 | #include "network-coding.h" | |
fc957275 | 55 | #include "originator.h" |
1e2c2a4f | 56 | #include "packet.h" |
fc957275 | 57 | #include "routing.h" |
fc957275 | 58 | #include "send.h" |
1e2c2a4f | 59 | #include "translation-table.h" |
fc957275 | 60 | |
791c2a2d | 61 | /** |
95298a91 | 62 | * enum batadv_dup_status - duplicate status |
9f52ee19 | 63 | * @BATADV_NO_DUP: the packet is no duplicate |
791c2a2d AQ |
64 | * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the |
65 | * neighbor) | |
66 | * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor | |
67 | * @BATADV_PROTECTED: originator is currently protected (after reboot) | |
68 | */ | |
69 | enum batadv_dup_status { | |
70 | BATADV_NO_DUP = 0, | |
71 | BATADV_ORIG_DUP, | |
72 | BATADV_NEIGH_DUP, | |
73 | BATADV_PROTECTED, | |
74 | }; | |
75 | ||
24a5deeb AQ |
76 | /** |
77 | * batadv_ring_buffer_set - update the ring buffer with the given value | |
78 | * @lq_recv: pointer to the ring buffer | |
79 | * @lq_index: index to store the value at | |
80 | * @value: value to store in the ring buffer | |
81 | */ | |
6b5e971a | 82 | static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) |
24a5deeb AQ |
83 | { |
84 | lq_recv[*lq_index] = value; | |
85 | *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; | |
86 | } | |
87 | ||
88 | /** | |
d491dbb6 | 89 | * batadv_ring_buffer_avg - compute the average of all non-zero values stored |
24a5deeb AQ |
90 | * in the given ring buffer |
91 | * @lq_recv: pointer to the ring buffer | |
92 | * | |
62fe710f | 93 | * Return: computed average value. |
24a5deeb | 94 | */ |
6b5e971a | 95 | static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) |
24a5deeb | 96 | { |
6b5e971a SE |
97 | const u8 *ptr; |
98 | u16 count = 0; | |
99 | u16 i = 0; | |
100 | u16 sum = 0; | |
24a5deeb AQ |
101 | |
102 | ptr = lq_recv; | |
103 | ||
104 | while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { | |
105 | if (*ptr != 0) { | |
106 | count++; | |
107 | sum += *ptr; | |
108 | } | |
109 | ||
110 | i++; | |
111 | ptr++; | |
112 | } | |
113 | ||
114 | if (count == 0) | |
115 | return 0; | |
116 | ||
6b5e971a | 117 | return (u8)(sum / count); |
24a5deeb | 118 | } |
d98cae64 | 119 | |
d0015fdd AQ |
120 | /** |
121 | * batadv_iv_ogm_orig_free - free the private resources allocated for this | |
122 | * orig_node | |
123 | * @orig_node: the orig_node for which the resources have to be free'd | |
124 | */ | |
125 | static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) | |
126 | { | |
127 | kfree(orig_node->bat_iv.bcast_own); | |
128 | kfree(orig_node->bat_iv.bcast_own_sum); | |
129 | } | |
130 | ||
131 | /** | |
132 | * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to | |
133 | * include the new hard-interface | |
134 | * @orig_node: the orig_node that has to be changed | |
135 | * @max_if_num: the current amount of interfaces | |
136 | * | |
62fe710f | 137 | * Return: 0 on success, a negative error code otherwise. |
d0015fdd AQ |
138 | */ |
139 | static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, | |
140 | int max_if_num) | |
141 | { | |
142 | void *data_ptr; | |
0185dda6 | 143 | size_t old_size; |
d0015fdd AQ |
144 | int ret = -ENOMEM; |
145 | ||
146 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
147 | ||
d0015fdd | 148 | old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; |
0185dda6 AQ |
149 | data_ptr = kmalloc_array(max_if_num, |
150 | BATADV_NUM_WORDS * sizeof(unsigned long), | |
151 | GFP_ATOMIC); | |
d0015fdd AQ |
152 | if (!data_ptr) |
153 | goto unlock; | |
154 | ||
155 | memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); | |
156 | kfree(orig_node->bat_iv.bcast_own); | |
157 | orig_node->bat_iv.bcast_own = data_ptr; | |
158 | ||
6b5e971a | 159 | data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
f7dcdf5f | 160 | if (!data_ptr) |
d0015fdd | 161 | goto unlock; |
d0015fdd AQ |
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 | /** | |
64ae7445 | 177 | * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own |
d0015fdd AQ |
178 | * @orig_node: the orig_node that has to be changed |
179 | * @max_if_num: the current amount of interfaces | |
180 | * @del_if_num: the index of the interface being removed | |
d0015fdd | 181 | */ |
64ae7445 SE |
182 | static void |
183 | batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, | |
184 | int max_if_num, int del_if_num) | |
d0015fdd | 185 | { |
64ae7445 SE |
186 | size_t chunk_size; |
187 | size_t if_offset; | |
188 | void *data_ptr; | |
d0015fdd | 189 | |
64ae7445 | 190 | lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); |
d0015fdd AQ |
191 | |
192 | chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; | |
0185dda6 | 193 | data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); |
d0015fdd | 194 | if (!data_ptr) |
64ae7445 SE |
195 | /* use old buffer when new one could not be allocated */ |
196 | data_ptr = orig_node->bat_iv.bcast_own; | |
d0015fdd AQ |
197 | |
198 | /* copy first part */ | |
64ae7445 | 199 | memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); |
d0015fdd AQ |
200 | |
201 | /* copy second part */ | |
13bbdd37 | 202 | if_offset = (del_if_num + 1) * chunk_size; |
64ae7445 SE |
203 | memmove((char *)data_ptr + del_if_num * chunk_size, |
204 | (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, | |
205 | (max_if_num - del_if_num) * chunk_size); | |
d0015fdd | 206 | |
64ae7445 SE |
207 | /* bcast_own was shrunk down in new buffer; free old one */ |
208 | if (orig_node->bat_iv.bcast_own != data_ptr) { | |
209 | kfree(orig_node->bat_iv.bcast_own); | |
210 | orig_node->bat_iv.bcast_own = data_ptr; | |
211 | } | |
212 | } | |
d0015fdd | 213 | |
64ae7445 SE |
214 | /** |
215 | * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum | |
216 | * @orig_node: the orig_node that has to be changed | |
217 | * @max_if_num: the current amount of interfaces | |
218 | * @del_if_num: the index of the interface being removed | |
219 | */ | |
220 | static void | |
221 | batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, | |
222 | int max_if_num, int del_if_num) | |
223 | { | |
224 | size_t if_offset; | |
225 | void *data_ptr; | |
226 | ||
227 | lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); | |
d0015fdd | 228 | |
6b5e971a | 229 | data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); |
64ae7445 SE |
230 | if (!data_ptr) |
231 | /* use old buffer when new one could not be allocated */ | |
232 | data_ptr = orig_node->bat_iv.bcast_own_sum; | |
d0015fdd | 233 | |
64ae7445 SE |
234 | memmove(data_ptr, orig_node->bat_iv.bcast_own_sum, |
235 | del_if_num * sizeof(u8)); | |
d0015fdd | 236 | |
6b5e971a | 237 | if_offset = (del_if_num + 1) * sizeof(u8); |
64ae7445 SE |
238 | memmove((char *)data_ptr + del_if_num * sizeof(u8), |
239 | orig_node->bat_iv.bcast_own_sum + if_offset, | |
240 | (max_if_num - del_if_num) * sizeof(u8)); | |
241 | ||
242 | /* bcast_own_sum was shrunk down in new buffer; free old one */ | |
243 | if (orig_node->bat_iv.bcast_own_sum != data_ptr) { | |
244 | kfree(orig_node->bat_iv.bcast_own_sum); | |
245 | orig_node->bat_iv.bcast_own_sum = data_ptr; | |
246 | } | |
247 | } | |
d0015fdd | 248 | |
64ae7445 SE |
249 | /** |
250 | * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to | |
251 | * exclude the removed interface | |
252 | * @orig_node: the orig_node that has to be changed | |
253 | * @max_if_num: the current amount of interfaces | |
254 | * @del_if_num: the index of the interface being removed | |
255 | * | |
256 | * Return: 0 on success, a negative error code otherwise. | |
257 | */ | |
258 | static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, | |
259 | int max_if_num, int del_if_num) | |
260 | { | |
261 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); | |
262 | ||
263 | if (max_if_num == 0) { | |
264 | kfree(orig_node->bat_iv.bcast_own); | |
265 | kfree(orig_node->bat_iv.bcast_own_sum); | |
266 | orig_node->bat_iv.bcast_own = NULL; | |
267 | orig_node->bat_iv.bcast_own_sum = NULL; | |
268 | } else { | |
269 | batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num, | |
270 | del_if_num); | |
271 | batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num, | |
272 | del_if_num); | |
273 | } | |
d0015fdd | 274 | |
d0015fdd AQ |
275 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
276 | ||
64ae7445 | 277 | return 0; |
d0015fdd AQ |
278 | } |
279 | ||
bbad0a5e AQ |
280 | /** |
281 | * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator | |
282 | * @bat_priv: the bat priv with all the soft interface information | |
283 | * @addr: mac address of the originator | |
284 | * | |
62fe710f | 285 | * Return: the originator object corresponding to the passed mac address or NULL |
bbad0a5e AQ |
286 | * on failure. |
287 | * If the object does not exists it is created an initialised. | |
288 | */ | |
289 | static struct batadv_orig_node * | |
6b5e971a | 290 | batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) |
bbad0a5e AQ |
291 | { |
292 | struct batadv_orig_node *orig_node; | |
293 | int size, hash_added; | |
294 | ||
295 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
296 | if (orig_node) | |
297 | return orig_node; | |
298 | ||
299 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
300 | if (!orig_node) | |
301 | return NULL; | |
302 | ||
303 | spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); | |
304 | ||
305 | size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; | |
306 | orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); | |
307 | if (!orig_node->bat_iv.bcast_own) | |
308 | goto free_orig_node; | |
309 | ||
6b5e971a | 310 | size = bat_priv->num_ifaces * sizeof(u8); |
bbad0a5e AQ |
311 | orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); |
312 | if (!orig_node->bat_iv.bcast_own_sum) | |
a5a5cb8c | 313 | goto free_orig_node; |
bbad0a5e AQ |
314 | |
315 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, | |
316 | batadv_choose_orig, orig_node, | |
317 | &orig_node->hash_entry); | |
318 | if (hash_added != 0) | |
a5a5cb8c | 319 | goto free_orig_node; |
bbad0a5e AQ |
320 | |
321 | return orig_node; | |
322 | ||
bbad0a5e | 323 | free_orig_node: |
b2262df7 | 324 | /* free twice, as batadv_orig_node_new sets refcount to 2 */ |
5d967310 SE |
325 | batadv_orig_node_put(orig_node); |
326 | batadv_orig_node_put(orig_node); | |
bbad0a5e AQ |
327 | |
328 | return NULL; | |
329 | } | |
330 | ||
56303d34 SE |
331 | static struct batadv_neigh_node * |
332 | batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, | |
6b5e971a | 333 | const u8 *neigh_addr, |
56303d34 | 334 | struct batadv_orig_node *orig_node, |
863dd7a8 | 335 | struct batadv_orig_node *orig_neigh) |
7ae8b285 | 336 | { |
741aa06b | 337 | struct batadv_neigh_node *neigh_node; |
7ae8b285 | 338 | |
3f32f8a6 | 339 | neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr); |
7ae8b285 ML |
340 | if (!neigh_node) |
341 | goto out; | |
342 | ||
89652331 | 343 | neigh_node->orig_node = orig_neigh; |
7ae8b285 | 344 | |
7ae8b285 ML |
345 | out: |
346 | return neigh_node; | |
347 | } | |
348 | ||
56303d34 | 349 | static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 350 | { |
96412690 | 351 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 352 | unsigned char *ogm_buff; |
6b5e971a | 353 | u32 random_seqno; |
d7d32ec0 ML |
354 | |
355 | /* randomize initial seqno to avoid collision */ | |
356 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
14511519 | 357 | atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
d0b9fd89 | 358 | |
14511519 ML |
359 | hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
360 | ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); | |
361 | if (!ogm_buff) | |
42d9f2cb | 362 | return -ENOMEM; |
77af7575 | 363 | |
14511519 ML |
364 | hard_iface->bat_iv.ogm_buff = ogm_buff; |
365 | ||
366 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; | |
a40d9b07 SW |
367 | batadv_ogm_packet->packet_type = BATADV_IV_OGM; |
368 | batadv_ogm_packet->version = BATADV_COMPAT_VERSION; | |
369 | batadv_ogm_packet->ttl = 2; | |
96412690 | 370 | batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
414254e3 | 371 | batadv_ogm_packet->reserved = 0; |
96412690 | 372 | batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
77af7575 | 373 | |
42d9f2cb | 374 | return 0; |
d0b9fd89 ML |
375 | } |
376 | ||
56303d34 | 377 | static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
00a50076 | 378 | { |
14511519 ML |
379 | kfree(hard_iface->bat_iv.ogm_buff); |
380 | hard_iface->bat_iv.ogm_buff = NULL; | |
00a50076 ML |
381 | } |
382 | ||
56303d34 | 383 | static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
d0b9fd89 | 384 | { |
96412690 | 385 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 386 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 387 | |
14511519 | 388 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
8fdd0153 AQ |
389 | ether_addr_copy(batadv_ogm_packet->orig, |
390 | hard_iface->net_dev->dev_addr); | |
391 | ether_addr_copy(batadv_ogm_packet->prev_sender, | |
392 | hard_iface->net_dev->dev_addr); | |
d0b9fd89 ML |
393 | } |
394 | ||
56303d34 SE |
395 | static void |
396 | batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) | |
d0b9fd89 | 397 | { |
96412690 | 398 | struct batadv_ogm_packet *batadv_ogm_packet; |
14511519 | 399 | unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
d0b9fd89 | 400 | |
14511519 | 401 | batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
a40d9b07 | 402 | batadv_ogm_packet->ttl = BATADV_TTL; |
d0b9fd89 ML |
403 | } |
404 | ||
b9dacc52 | 405 | /* when do we schedule our own ogm to be sent */ |
fe8bc396 | 406 | static unsigned long |
56303d34 | 407 | batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
b9dacc52 | 408 | { |
42d0b044 SE |
409 | unsigned int msecs; |
410 | ||
411 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
e76e4320 | 412 | msecs += prandom_u32() % (2 * BATADV_JITTER); |
42d0b044 SE |
413 | |
414 | return jiffies + msecs_to_jiffies(msecs); | |
b9dacc52 ML |
415 | } |
416 | ||
417 | /* when do we schedule a ogm packet to be sent */ | |
fe8bc396 | 418 | static unsigned long batadv_iv_ogm_fwd_send_time(void) |
b9dacc52 | 419 | { |
e76e4320 | 420 | return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); |
b9dacc52 ML |
421 | } |
422 | ||
423 | /* apply hop penalty for a normal link */ | |
6b5e971a | 424 | static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) |
b9dacc52 ML |
425 | { |
426 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
42d0b044 SE |
427 | int new_tq; |
428 | ||
429 | new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); | |
430 | new_tq /= BATADV_TQ_MAX_VALUE; | |
431 | ||
432 | return new_tq; | |
b9dacc52 ML |
433 | } |
434 | ||
600184b7 SW |
435 | /** |
436 | * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached | |
437 | * @buff_pos: current position in the skb | |
438 | * @packet_len: total length of the skb | |
439 | * @tvlv_len: tvlv length of the previously considered OGM | |
440 | * | |
441 | * Return: true if there is enough space for another OGM, false otherwise. | |
442 | */ | |
9fd9b19e MP |
443 | static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
444 | __be16 tvlv_len) | |
fc957275 | 445 | { |
08c36d3e SE |
446 | int next_buff_pos = 0; |
447 | ||
7e071c79 | 448 | next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
ef261577 | 449 | next_buff_pos += ntohs(tvlv_len); |
fc957275 ML |
450 | |
451 | return (next_buff_pos <= packet_len) && | |
42d0b044 | 452 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
fc957275 ML |
453 | } |
454 | ||
b9dacc52 | 455 | /* send a batman ogm to a given interface */ |
56303d34 SE |
456 | static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
457 | struct batadv_hard_iface *hard_iface) | |
b9dacc52 | 458 | { |
56303d34 | 459 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
de12baec | 460 | const char *fwd_str; |
6b5e971a SE |
461 | u8 packet_num; |
462 | s16 buff_pos; | |
96412690 | 463 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 464 | struct sk_buff *skb; |
6b5e971a | 465 | u8 *packet_pos; |
b9dacc52 | 466 | |
e9a4f295 | 467 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
b9dacc52 ML |
468 | return; |
469 | ||
470 | packet_num = 0; | |
471 | buff_pos = 0; | |
c67893d1 SE |
472 | packet_pos = forw_packet->skb->data; |
473 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
474 | |
475 | /* adjust all flags and log packets */ | |
fe8bc396 | 476 | while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
ef261577 | 477 | batadv_ogm_packet->tvlv_len)) { |
b9dacc52 | 478 | /* we might have aggregated direct link packets with an |
9cfc7bd6 SE |
479 | * ordinary base packet |
480 | */ | |
8de47de5 SE |
481 | if (forw_packet->direct_link_flags & BIT(packet_num) && |
482 | forw_packet->if_incoming == hard_iface) | |
96412690 | 483 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 484 | else |
96412690 | 485 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 486 | |
c67893d1 SE |
487 | if (packet_num > 0 || !forw_packet->own) |
488 | fwd_str = "Forwarding"; | |
489 | else | |
490 | fwd_str = "Sending own"; | |
491 | ||
39c75a51 | 492 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
e1bf0c14 | 493 | "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", |
1eda58bf | 494 | fwd_str, (packet_num > 0 ? "aggregated " : ""), |
96412690 SE |
495 | batadv_ogm_packet->orig, |
496 | ntohl(batadv_ogm_packet->seqno), | |
a40d9b07 | 497 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl, |
a2f2b6cd | 498 | ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? |
1eda58bf | 499 | "on" : "off"), |
e1bf0c14 | 500 | hard_iface->net_dev->name, |
1eda58bf | 501 | hard_iface->net_dev->dev_addr); |
b9dacc52 | 502 | |
7e071c79 | 503 | buff_pos += BATADV_OGM_HLEN; |
ef261577 | 504 | buff_pos += ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 505 | packet_num++; |
c67893d1 SE |
506 | packet_pos = forw_packet->skb->data + buff_pos; |
507 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b9dacc52 ML |
508 | } |
509 | ||
510 | /* create clone because function is called more than once */ | |
511 | skb = skb_clone(forw_packet->skb, GFP_ATOMIC); | |
f8214865 | 512 | if (skb) { |
d69909d2 SE |
513 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
514 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
f8214865 | 515 | skb->len + ETH_HLEN); |
95d39278 | 516 | batadv_send_broadcast_skb(skb, hard_iface); |
f8214865 | 517 | } |
b9dacc52 ML |
518 | } |
519 | ||
520 | /* send a batman ogm packet */ | |
56303d34 | 521 | static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
b9dacc52 | 522 | { |
b9dacc52 | 523 | struct net_device *soft_iface; |
56303d34 SE |
524 | struct batadv_priv *bat_priv; |
525 | struct batadv_hard_iface *primary_if = NULL; | |
b9dacc52 ML |
526 | |
527 | if (!forw_packet->if_incoming) { | |
86ceb360 | 528 | pr_err("Error - can't forward packet: incoming iface not specified\n"); |
b9dacc52 ML |
529 | goto out; |
530 | } | |
531 | ||
532 | soft_iface = forw_packet->if_incoming->soft_iface; | |
533 | bat_priv = netdev_priv(soft_iface); | |
534 | ||
ef0a937f | 535 | if (WARN_ON(!forw_packet->if_outgoing)) |
b9dacc52 ML |
536 | goto out; |
537 | ||
ef0a937f | 538 | if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) |
b9dacc52 ML |
539 | goto out; |
540 | ||
ef0a937f | 541 | if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
b9dacc52 | 542 | goto out; |
b9dacc52 | 543 | |
ef0a937f SW |
544 | primary_if = batadv_primary_if_get_selected(bat_priv); |
545 | if (!primary_if) | |
546 | goto out; | |
b9dacc52 | 547 | |
ef0a937f SW |
548 | /* only for one specific outgoing interface */ |
549 | batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); | |
b9dacc52 ML |
550 | |
551 | out: | |
552 | if (primary_if) | |
82047ad7 | 553 | batadv_hardif_put(primary_if); |
b9dacc52 ML |
554 | } |
555 | ||
ef0a937f SW |
556 | /** |
557 | * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an | |
558 | * existing forward packet | |
559 | * @new_bat_ogm_packet: OGM packet to be aggregated | |
560 | * @bat_priv: the bat priv with all the soft interface information | |
561 | * @packet_len: (total) length of the OGM | |
562 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
95298a91 | 563 | * @directlink: true if this is a direct link packet |
ef0a937f SW |
564 | * @if_incoming: interface where the packet was received |
565 | * @if_outgoing: interface for which the retransmission should be considered | |
566 | * @forw_packet: the forwarded packet which should be checked | |
567 | * | |
62fe710f | 568 | * Return: true if new_packet can be aggregated with forw_packet |
ef0a937f | 569 | */ |
fe8bc396 | 570 | static bool |
96412690 | 571 | batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
56303d34 | 572 | struct batadv_priv *bat_priv, |
fe8bc396 SE |
573 | int packet_len, unsigned long send_time, |
574 | bool directlink, | |
56303d34 | 575 | const struct batadv_hard_iface *if_incoming, |
ef0a937f | 576 | const struct batadv_hard_iface *if_outgoing, |
56303d34 | 577 | const struct batadv_forw_packet *forw_packet) |
b9dacc52 | 578 | { |
96412690 | 579 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 580 | int aggregated_bytes = forw_packet->packet_len + packet_len; |
56303d34 | 581 | struct batadv_hard_iface *primary_if = NULL; |
b9dacc52 | 582 | bool res = false; |
42d0b044 | 583 | unsigned long aggregation_end_time; |
b9dacc52 | 584 | |
96412690 | 585 | batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
42d0b044 SE |
586 | aggregation_end_time = send_time; |
587 | aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); | |
b9dacc52 | 588 | |
9cfc7bd6 | 589 | /* we can aggregate the current packet to this aggregated packet |
b9dacc52 ML |
590 | * if: |
591 | * | |
592 | * - the send time is within our MAX_AGGREGATION_MS time | |
593 | * - the resulting packet wont be bigger than | |
594 | * MAX_AGGREGATION_BYTES | |
8f34b388 | 595 | * otherwise aggregation is not possible |
b9dacc52 | 596 | */ |
8f34b388 MP |
597 | if (!time_before(send_time, forw_packet->send_time) || |
598 | !time_after_eq(aggregation_end_time, forw_packet->send_time)) | |
599 | return false; | |
600 | ||
601 | if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) | |
602 | return false; | |
603 | ||
604 | /* packet is not leaving on the same interface. */ | |
605 | if (forw_packet->if_outgoing != if_outgoing) | |
606 | return false; | |
607 | ||
608 | /* check aggregation compatibility | |
609 | * -> direct link packets are broadcasted on | |
610 | * their interface only | |
611 | * -> aggregate packet if the current packet is | |
612 | * a "global" packet as well as the base | |
613 | * packet | |
614 | */ | |
615 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
616 | if (!primary_if) | |
617 | return false; | |
ef0a937f | 618 | |
8f34b388 MP |
619 | /* packets without direct link flag and high TTL |
620 | * are flooded through the net | |
621 | */ | |
622 | if (!directlink && | |
623 | !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && | |
624 | batadv_ogm_packet->ttl != 1 && | |
625 | ||
626 | /* own packets originating non-primary | |
627 | * interfaces leave only that interface | |
628 | */ | |
629 | (!forw_packet->own || | |
630 | forw_packet->if_incoming == primary_if)) { | |
631 | res = true; | |
632 | goto out; | |
633 | } | |
b9dacc52 | 634 | |
8f34b388 MP |
635 | /* if the incoming packet is sent via this one |
636 | * interface only - we still can aggregate | |
637 | */ | |
638 | if (directlink && | |
639 | new_bat_ogm_packet->ttl == 1 && | |
640 | forw_packet->if_incoming == if_incoming && | |
641 | ||
642 | /* packets from direct neighbors or | |
643 | * own secondary interface packets | |
644 | * (= secondary interface packets in general) | |
645 | */ | |
646 | (batadv_ogm_packet->flags & BATADV_DIRECTLINK || | |
647 | (forw_packet->own && | |
648 | forw_packet->if_incoming != primary_if))) { | |
649 | res = true; | |
650 | goto out; | |
b9dacc52 ML |
651 | } |
652 | ||
653 | out: | |
654 | if (primary_if) | |
82047ad7 | 655 | batadv_hardif_put(primary_if); |
b9dacc52 ML |
656 | return res; |
657 | } | |
658 | ||
1b371d13 SW |
659 | /** |
660 | * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this | |
ef0a937f SW |
661 | * packet to it. |
662 | * @packet_buff: pointer to the OGM | |
663 | * @packet_len: (total) length of the OGM | |
664 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
665 | * @direct_link: whether this OGM has direct link status | |
666 | * @if_incoming: interface where the packet was received | |
667 | * @if_outgoing: interface for which the retransmission should be considered | |
668 | * @own_packet: true if it is a self-generated ogm | |
669 | */ | |
fe8bc396 SE |
670 | static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
671 | int packet_len, unsigned long send_time, | |
672 | bool direct_link, | |
56303d34 | 673 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 674 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 675 | int own_packet) |
b9dacc52 | 676 | { |
56303d34 SE |
677 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
678 | struct batadv_forw_packet *forw_packet_aggr; | |
b9dacc52 | 679 | unsigned char *skb_buff; |
42d0b044 | 680 | unsigned int skb_size; |
b9dacc52 | 681 | |
b9dacc52 ML |
682 | /* own packet should always be scheduled */ |
683 | if (!own_packet) { | |
3e34819e | 684 | if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
39c75a51 | 685 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 686 | "batman packet queue full\n"); |
17a86915 | 687 | return; |
b9dacc52 ML |
688 | } |
689 | } | |
690 | ||
691 | forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); | |
940d156f MP |
692 | if (!forw_packet_aggr) |
693 | goto out_nomem; | |
b9dacc52 | 694 | |
940d156f MP |
695 | if (atomic_read(&bat_priv->aggregated_ogms) && |
696 | packet_len < BATADV_MAX_AGGREGATION_BYTES) | |
5b246574 | 697 | skb_size = BATADV_MAX_AGGREGATION_BYTES; |
b9dacc52 | 698 | else |
5b246574 SE |
699 | skb_size = packet_len; |
700 | ||
41ab6c48 | 701 | skb_size += ETH_HLEN; |
b9dacc52 | 702 | |
41ab6c48 | 703 | forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); |
940d156f MP |
704 | if (!forw_packet_aggr->skb) |
705 | goto out_free_forw_packet; | |
c54f38c9 | 706 | forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 707 | skb_reserve(forw_packet_aggr->skb, ETH_HLEN); |
b9dacc52 | 708 | |
b9dacc52 ML |
709 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
710 | forw_packet_aggr->packet_len = packet_len; | |
711 | memcpy(skb_buff, packet_buff, packet_len); | |
712 | ||
17a86915 SE |
713 | kref_get(&if_incoming->refcount); |
714 | kref_get(&if_outgoing->refcount); | |
b9dacc52 ML |
715 | forw_packet_aggr->own = own_packet; |
716 | forw_packet_aggr->if_incoming = if_incoming; | |
ef0a937f | 717 | forw_packet_aggr->if_outgoing = if_outgoing; |
b9dacc52 | 718 | forw_packet_aggr->num_packets = 0; |
42d0b044 | 719 | forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
b9dacc52 ML |
720 | forw_packet_aggr->send_time = send_time; |
721 | ||
722 | /* save packet direct link flag status */ | |
723 | if (direct_link) | |
724 | forw_packet_aggr->direct_link_flags |= 1; | |
725 | ||
726 | /* add new packet to packet list */ | |
727 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
728 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
729 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
730 | ||
731 | /* start timer for this packet */ | |
732 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
9455e34c | 733 | batadv_send_outstanding_bat_ogm_packet); |
3193e8fd | 734 | queue_delayed_work(batadv_event_workqueue, |
b9dacc52 ML |
735 | &forw_packet_aggr->delayed_work, |
736 | send_time - jiffies); | |
737 | ||
738 | return; | |
940d156f MP |
739 | out_free_forw_packet: |
740 | kfree(forw_packet_aggr); | |
741 | out_nomem: | |
742 | if (!own_packet) | |
743 | atomic_inc(&bat_priv->batman_queue_left); | |
b9dacc52 ML |
744 | } |
745 | ||
746 | /* aggregate a new packet into the existing ogm packet */ | |
56303d34 | 747 | static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
fe8bc396 SE |
748 | const unsigned char *packet_buff, |
749 | int packet_len, bool direct_link) | |
b9dacc52 ML |
750 | { |
751 | unsigned char *skb_buff; | |
8de47de5 | 752 | unsigned long new_direct_link_flag; |
b9dacc52 ML |
753 | |
754 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
755 | memcpy(skb_buff, packet_buff, packet_len); | |
756 | forw_packet_aggr->packet_len += packet_len; | |
757 | forw_packet_aggr->num_packets++; | |
758 | ||
759 | /* save packet direct link flag status */ | |
8de47de5 SE |
760 | if (direct_link) { |
761 | new_direct_link_flag = BIT(forw_packet_aggr->num_packets); | |
762 | forw_packet_aggr->direct_link_flags |= new_direct_link_flag; | |
763 | } | |
b9dacc52 ML |
764 | } |
765 | ||
ef0a937f SW |
766 | /** |
767 | * batadv_iv_ogm_queue_add - queue up an OGM for transmission | |
768 | * @bat_priv: the bat priv with all the soft interface information | |
769 | * @packet_buff: pointer to the OGM | |
770 | * @packet_len: (total) length of the OGM | |
771 | * @if_incoming: interface where the packet was received | |
772 | * @if_outgoing: interface for which the retransmission should be considered | |
773 | * @own_packet: true if it is a self-generated ogm | |
774 | * @send_time: timestamp (jiffies) when the packet is to be sent | |
775 | */ | |
56303d34 | 776 | static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
fe8bc396 SE |
777 | unsigned char *packet_buff, |
778 | int packet_len, | |
56303d34 | 779 | struct batadv_hard_iface *if_incoming, |
ef0a937f | 780 | struct batadv_hard_iface *if_outgoing, |
fe8bc396 | 781 | int own_packet, unsigned long send_time) |
b9dacc52 | 782 | { |
9cfc7bd6 | 783 | /* _aggr -> pointer to the packet we want to aggregate with |
b9dacc52 ML |
784 | * _pos -> pointer to the position in the queue |
785 | */ | |
56303d34 SE |
786 | struct batadv_forw_packet *forw_packet_aggr = NULL; |
787 | struct batadv_forw_packet *forw_packet_pos = NULL; | |
96412690 | 788 | struct batadv_ogm_packet *batadv_ogm_packet; |
b9dacc52 | 789 | bool direct_link; |
42d0b044 | 790 | unsigned long max_aggregation_jiffies; |
b9dacc52 | 791 | |
96412690 | 792 | batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
56489151 | 793 | direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); |
42d0b044 | 794 | max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
b9dacc52 ML |
795 | |
796 | /* find position for the packet in the forward queue */ | |
797 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
798 | /* own packets are not to be aggregated */ | |
56489151 | 799 | if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { |
b67bfe0d | 800 | hlist_for_each_entry(forw_packet_pos, |
b9dacc52 | 801 | &bat_priv->forw_bat_list, list) { |
96412690 | 802 | if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
fe8bc396 SE |
803 | bat_priv, packet_len, |
804 | send_time, direct_link, | |
805 | if_incoming, | |
ef0a937f | 806 | if_outgoing, |
fe8bc396 | 807 | forw_packet_pos)) { |
b9dacc52 ML |
808 | forw_packet_aggr = forw_packet_pos; |
809 | break; | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | /* nothing to aggregate with - either aggregation disabled or no | |
9cfc7bd6 SE |
815 | * suitable aggregation packet found |
816 | */ | |
b9dacc52 ML |
817 | if (!forw_packet_aggr) { |
818 | /* the following section can run without the lock */ | |
819 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
820 | ||
9cfc7bd6 | 821 | /* if we could not aggregate this packet with one of the others |
b9dacc52 ML |
822 | * we hold it back for a while, so that it might be aggregated |
823 | * later on | |
824 | */ | |
42d0b044 SE |
825 | if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
826 | send_time += max_aggregation_jiffies; | |
b9dacc52 | 827 | |
fe8bc396 SE |
828 | batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
829 | send_time, direct_link, | |
ef0a937f SW |
830 | if_incoming, if_outgoing, |
831 | own_packet); | |
b9dacc52 | 832 | } else { |
fe8bc396 SE |
833 | batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
834 | packet_len, direct_link); | |
b9dacc52 ML |
835 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
836 | } | |
837 | } | |
838 | ||
56303d34 | 839 | static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
fe8bc396 | 840 | const struct ethhdr *ethhdr, |
96412690 | 841 | struct batadv_ogm_packet *batadv_ogm_packet, |
fe8bc396 SE |
842 | bool is_single_hop_neigh, |
843 | bool is_from_best_next_hop, | |
ef0a937f SW |
844 | struct batadv_hard_iface *if_incoming, |
845 | struct batadv_hard_iface *if_outgoing) | |
b9dacc52 | 846 | { |
56303d34 | 847 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
6b5e971a | 848 | u16 tvlv_len; |
b9dacc52 | 849 | |
a40d9b07 | 850 | if (batadv_ogm_packet->ttl <= 1) { |
39c75a51 | 851 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
b9dacc52 ML |
852 | return; |
853 | } | |
854 | ||
13b2541b ML |
855 | if (!is_from_best_next_hop) { |
856 | /* Mark the forwarded packet when it is not coming from our | |
857 | * best next hop. We still need to forward the packet for our | |
858 | * neighbor link quality detection to work in case the packet | |
859 | * originated from a single hop neighbor. Otherwise we can | |
860 | * simply drop the ogm. | |
861 | */ | |
862 | if (is_single_hop_neigh) | |
96412690 | 863 | batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
13b2541b ML |
864 | else |
865 | return; | |
866 | } | |
b9dacc52 | 867 | |
ef261577 | 868 | tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); |
b9dacc52 | 869 | |
a40d9b07 | 870 | batadv_ogm_packet->ttl--; |
8fdd0153 | 871 | ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); |
b9dacc52 | 872 | |
b9dacc52 | 873 | /* apply hop penalty */ |
96412690 | 874 | batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
fe8bc396 | 875 | bat_priv); |
b9dacc52 | 876 | |
39c75a51 | 877 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 878 | "Forwarding packet: tq: %i, ttl: %i\n", |
a40d9b07 | 879 | batadv_ogm_packet->tq, batadv_ogm_packet->ttl); |
b9dacc52 | 880 | |
75cd33f8 | 881 | if (is_single_hop_neigh) |
96412690 | 882 | batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
b9dacc52 | 883 | else |
96412690 | 884 | batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
b9dacc52 | 885 | |
96412690 | 886 | batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
ef261577 | 887 | BATADV_OGM_HLEN + tvlv_len, |
ef0a937f SW |
888 | if_incoming, if_outgoing, 0, |
889 | batadv_iv_ogm_fwd_send_time()); | |
b9dacc52 ML |
890 | } |
891 | ||
d9896617 AQ |
892 | /** |
893 | * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for | |
894 | * the given interface | |
895 | * @hard_iface: the interface for which the windows have to be shifted | |
896 | */ | |
897 | static void | |
898 | batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) | |
899 | { | |
900 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
901 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
902 | struct hlist_head *head; | |
903 | struct batadv_orig_node *orig_node; | |
904 | unsigned long *word; | |
6b5e971a | 905 | u32 i; |
d9896617 | 906 | size_t word_index; |
6b5e971a | 907 | u8 *w; |
bbad0a5e | 908 | int if_num; |
d9896617 AQ |
909 | |
910 | for (i = 0; i < hash->size; i++) { | |
911 | head = &hash->table[i]; | |
912 | ||
913 | rcu_read_lock(); | |
914 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
bbad0a5e | 915 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 | 916 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
32db6aaa | 917 | word = &orig_node->bat_iv.bcast_own[word_index]; |
d9896617 AQ |
918 | |
919 | batadv_bit_get_packet(bat_priv, word, 1, 0); | |
bbad0a5e AQ |
920 | if_num = hard_iface->if_num; |
921 | w = &orig_node->bat_iv.bcast_own_sum[if_num]; | |
d9896617 | 922 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); |
bbad0a5e | 923 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
d9896617 AQ |
924 | } |
925 | rcu_read_unlock(); | |
926 | } | |
927 | } | |
928 | ||
56303d34 | 929 | static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
b9dacc52 | 930 | { |
56303d34 | 931 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
14511519 | 932 | unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
96412690 | 933 | struct batadv_ogm_packet *batadv_ogm_packet; |
ef0a937f | 934 | struct batadv_hard_iface *primary_if, *tmp_hard_iface; |
14511519 | 935 | int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
6b5e971a SE |
936 | u32 seqno; |
937 | u16 tvlv_len = 0; | |
ef0a937f | 938 | unsigned long send_time; |
b9dacc52 | 939 | |
e5d89254 | 940 | primary_if = batadv_primary_if_get_selected(bat_priv); |
b9dacc52 | 941 | |
e1bf0c14 ML |
942 | if (hard_iface == primary_if) { |
943 | /* tt changes have to be committed before the tvlv data is | |
944 | * appended as it may alter the tt tvlv container | |
945 | */ | |
946 | batadv_tt_local_commit_changes(bat_priv); | |
ef261577 ML |
947 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, |
948 | ogm_buff_len, | |
949 | BATADV_OGM_HLEN); | |
e1bf0c14 | 950 | } |
be9aa4c1 | 951 | |
14511519 | 952 | batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
ef261577 | 953 | batadv_ogm_packet->tvlv_len = htons(tvlv_len); |
b9dacc52 ML |
954 | |
955 | /* change sequence number to network order */ | |
6b5e971a | 956 | seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
bbb1f90e | 957 | batadv_ogm_packet->seqno = htonl(seqno); |
14511519 | 958 | atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
b9dacc52 | 959 | |
d9896617 | 960 | batadv_iv_ogm_slide_own_bcast_window(hard_iface); |
b9dacc52 | 961 | |
ef0a937f SW |
962 | send_time = batadv_iv_ogm_emit_send_time(bat_priv); |
963 | ||
964 | if (hard_iface != primary_if) { | |
965 | /* OGMs from secondary interfaces are only scheduled on their | |
966 | * respective interfaces. | |
967 | */ | |
968 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, | |
969 | hard_iface, hard_iface, 1, send_time); | |
970 | goto out; | |
971 | } | |
972 | ||
973 | /* OGMs from primary interfaces are scheduled on all | |
974 | * interfaces. | |
975 | */ | |
976 | rcu_read_lock(); | |
977 | list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { | |
978 | if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) | |
87b40f53 | 979 | continue; |
27353446 SE |
980 | |
981 | if (!kref_get_unless_zero(&tmp_hard_iface->refcount)) | |
982 | continue; | |
983 | ||
ef0a937f SW |
984 | batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, |
985 | *ogm_buff_len, hard_iface, | |
986 | tmp_hard_iface, 1, send_time); | |
27353446 SE |
987 | |
988 | batadv_hardif_put(tmp_hard_iface); | |
ef0a937f SW |
989 | } |
990 | rcu_read_unlock(); | |
991 | ||
992 | out: | |
b9dacc52 | 993 | if (primary_if) |
82047ad7 | 994 | batadv_hardif_put(primary_if); |
b9dacc52 ML |
995 | } |
996 | ||
89652331 SW |
997 | /** |
998 | * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an | |
999 | * originator | |
1000 | * @bat_priv: the bat priv with all the soft interface information | |
1001 | * @orig_node: the orig node who originally emitted the ogm packet | |
7351a482 | 1002 | * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node |
89652331 SW |
1003 | * @ethhdr: Ethernet header of the OGM |
1004 | * @batadv_ogm_packet: the ogm packet | |
1005 | * @if_incoming: interface where the packet was received | |
1006 | * @if_outgoing: interface for which the retransmission should be considered | |
89652331 SW |
1007 | * @dup_status: the duplicate status of this ogm packet. |
1008 | */ | |
fe8bc396 | 1009 | static void |
56303d34 SE |
1010 | batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
1011 | struct batadv_orig_node *orig_node, | |
7351a482 | 1012 | struct batadv_orig_ifinfo *orig_ifinfo, |
fe8bc396 | 1013 | const struct ethhdr *ethhdr, |
96412690 | 1014 | const struct batadv_ogm_packet *batadv_ogm_packet, |
56303d34 | 1015 | struct batadv_hard_iface *if_incoming, |
89652331 | 1016 | struct batadv_hard_iface *if_outgoing, |
7c24bbbe | 1017 | enum batadv_dup_status dup_status) |
fc957275 | 1018 | { |
89652331 SW |
1019 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
1020 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; | |
4f248cff SE |
1021 | struct batadv_neigh_node *neigh_node = NULL; |
1022 | struct batadv_neigh_node *tmp_neigh_node = NULL; | |
56303d34 SE |
1023 | struct batadv_neigh_node *router = NULL; |
1024 | struct batadv_orig_node *orig_node_tmp; | |
7caf69fb | 1025 | int if_num; |
6b5e971a SE |
1026 | u8 sum_orig, sum_neigh; |
1027 | u8 *neigh_addr; | |
1028 | u8 tq_avg; | |
fc957275 | 1029 | |
39c75a51 | 1030 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1031 | "update_originator(): Searching and updating originator entry of received packet\n"); |
fc957275 ML |
1032 | |
1033 | rcu_read_lock(); | |
b67bfe0d | 1034 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1035 | &orig_node->neigh_list, list) { |
1eda58bf SE |
1036 | neigh_addr = tmp_neigh_node->addr; |
1037 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && | |
1038 | tmp_neigh_node->if_incoming == if_incoming && | |
77ae32e8 | 1039 | kref_get_unless_zero(&tmp_neigh_node->refcount)) { |
38dc40ef | 1040 | if (WARN(neigh_node, "too many matching neigh_nodes")) |
25bb2509 | 1041 | batadv_neigh_node_put(neigh_node); |
fc957275 ML |
1042 | neigh_node = tmp_neigh_node; |
1043 | continue; | |
1044 | } | |
1045 | ||
7c24bbbe | 1046 | if (dup_status != BATADV_NO_DUP) |
fc957275 ML |
1047 | continue; |
1048 | ||
89652331 SW |
1049 | /* only update the entry for this outgoing interface */ |
1050 | neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, | |
1051 | if_outgoing); | |
1052 | if (!neigh_ifinfo) | |
1053 | continue; | |
1054 | ||
1055 | spin_lock_bh(&tmp_neigh_node->ifinfo_lock); | |
1056 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1057 | &neigh_ifinfo->bat_iv.tq_index, 0); | |
1058 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); | |
1059 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1060 | spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); | |
1061 | ||
044fa3ae | 1062 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
89652331 | 1063 | neigh_ifinfo = NULL; |
fc957275 ML |
1064 | } |
1065 | ||
1066 | if (!neigh_node) { | |
56303d34 | 1067 | struct batadv_orig_node *orig_tmp; |
fc957275 | 1068 | |
bbad0a5e | 1069 | orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); |
fc957275 ML |
1070 | if (!orig_tmp) |
1071 | goto unlock; | |
1072 | ||
fe8bc396 SE |
1073 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1074 | ethhdr->h_source, | |
863dd7a8 | 1075 | orig_node, orig_tmp); |
fc957275 | 1076 | |
5d967310 | 1077 | batadv_orig_node_put(orig_tmp); |
fc957275 ML |
1078 | if (!neigh_node) |
1079 | goto unlock; | |
23badd6d | 1080 | } else { |
39c75a51 | 1081 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1082 | "Updating existing last-hop neighbor of originator\n"); |
23badd6d | 1083 | } |
fc957275 ML |
1084 | |
1085 | rcu_read_unlock(); | |
89652331 SW |
1086 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1087 | if (!neigh_ifinfo) | |
1088 | goto out; | |
fc957275 | 1089 | |
d7b2a97e | 1090 | neigh_node->last_seen = jiffies; |
fc957275 | 1091 | |
89652331 SW |
1092 | spin_lock_bh(&neigh_node->ifinfo_lock); |
1093 | batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, | |
1094 | &neigh_ifinfo->bat_iv.tq_index, | |
96412690 | 1095 | batadv_ogm_packet->tq); |
89652331 SW |
1096 | tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); |
1097 | neigh_ifinfo->bat_iv.tq_avg = tq_avg; | |
1098 | spin_unlock_bh(&neigh_node->ifinfo_lock); | |
fc957275 | 1099 | |
7c24bbbe | 1100 | if (dup_status == BATADV_NO_DUP) { |
7351a482 | 1101 | orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
89652331 | 1102 | neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; |
fc957275 ML |
1103 | } |
1104 | ||
fc957275 | 1105 | /* if this neighbor already is our next hop there is nothing |
9cfc7bd6 SE |
1106 | * to change |
1107 | */ | |
7351a482 | 1108 | router = batadv_orig_router_get(orig_node, if_outgoing); |
fc957275 | 1109 | if (router == neigh_node) |
e1bf0c14 | 1110 | goto out; |
fc957275 | 1111 | |
89652331 SW |
1112 | if (router) { |
1113 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
1114 | if (!router_ifinfo) | |
1115 | goto out; | |
1116 | ||
1117 | /* if this neighbor does not offer a better TQ we won't | |
1118 | * consider it | |
1119 | */ | |
1120 | if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) | |
1121 | goto out; | |
1122 | } | |
fc957275 ML |
1123 | |
1124 | /* if the TQ is the same and the link not more symmetric we | |
9cfc7bd6 SE |
1125 | * won't consider it either |
1126 | */ | |
89652331 | 1127 | if (router_ifinfo && |
01b97a3e | 1128 | neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { |
fc957275 | 1129 | orig_node_tmp = router->orig_node; |
bbad0a5e | 1130 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1131 | if_num = router->if_incoming->if_num; |
bbad0a5e AQ |
1132 | sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1133 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 ML |
1134 | |
1135 | orig_node_tmp = neigh_node->orig_node; | |
bbad0a5e | 1136 | spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); |
7caf69fb | 1137 | if_num = neigh_node->if_incoming->if_num; |
bbad0a5e AQ |
1138 | sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; |
1139 | spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); | |
fc957275 | 1140 | |
bbb1f90e | 1141 | if (sum_orig >= sum_neigh) |
e1bf0c14 | 1142 | goto out; |
fc957275 ML |
1143 | } |
1144 | ||
7351a482 | 1145 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); |
fc957275 ML |
1146 | goto out; |
1147 | ||
1148 | unlock: | |
1149 | rcu_read_unlock(); | |
1150 | out: | |
1151 | if (neigh_node) | |
25bb2509 | 1152 | batadv_neigh_node_put(neigh_node); |
fc957275 | 1153 | if (router) |
25bb2509 | 1154 | batadv_neigh_node_put(router); |
89652331 | 1155 | if (neigh_ifinfo) |
044fa3ae | 1156 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
89652331 | 1157 | if (router_ifinfo) |
044fa3ae | 1158 | batadv_neigh_ifinfo_put(router_ifinfo); |
fc957275 ML |
1159 | } |
1160 | ||
89652331 SW |
1161 | /** |
1162 | * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet | |
1163 | * @orig_node: the orig node who originally emitted the ogm packet | |
1164 | * @orig_neigh_node: the orig node struct of the neighbor who sent the packet | |
1165 | * @batadv_ogm_packet: the ogm packet | |
1166 | * @if_incoming: interface where the packet was received | |
1167 | * @if_outgoing: interface for which the retransmission should be considered | |
1168 | * | |
4b426b10 | 1169 | * Return: true if the link can be considered bidirectional, false otherwise |
89652331 | 1170 | */ |
4b426b10 SE |
1171 | static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
1172 | struct batadv_orig_node *orig_neigh_node, | |
1173 | struct batadv_ogm_packet *batadv_ogm_packet, | |
1174 | struct batadv_hard_iface *if_incoming, | |
1175 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1176 | { |
56303d34 SE |
1177 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1178 | struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; | |
89652331 | 1179 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
6b5e971a SE |
1180 | u8 total_count; |
1181 | u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; | |
42d0b044 | 1182 | unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; |
d285f52c SE |
1183 | int if_num; |
1184 | unsigned int tq_asym_penalty, inv_asym_penalty; | |
42d0b044 | 1185 | unsigned int combined_tq; |
d285f52c | 1186 | unsigned int tq_iface_penalty; |
4b426b10 | 1187 | bool ret = false; |
fc957275 ML |
1188 | |
1189 | /* find corresponding one hop neighbor */ | |
1190 | rcu_read_lock(); | |
b67bfe0d | 1191 | hlist_for_each_entry_rcu(tmp_neigh_node, |
fc957275 | 1192 | &orig_neigh_node->neigh_list, list) { |
1eda58bf SE |
1193 | if (!batadv_compare_eth(tmp_neigh_node->addr, |
1194 | orig_neigh_node->orig)) | |
fc957275 ML |
1195 | continue; |
1196 | ||
1197 | if (tmp_neigh_node->if_incoming != if_incoming) | |
1198 | continue; | |
1199 | ||
77ae32e8 | 1200 | if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) |
fc957275 ML |
1201 | continue; |
1202 | ||
1203 | neigh_node = tmp_neigh_node; | |
1204 | break; | |
1205 | } | |
1206 | rcu_read_unlock(); | |
1207 | ||
1208 | if (!neigh_node) | |
fe8bc396 SE |
1209 | neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
1210 | orig_neigh_node->orig, | |
1211 | orig_neigh_node, | |
863dd7a8 | 1212 | orig_neigh_node); |
fc957275 ML |
1213 | |
1214 | if (!neigh_node) | |
1215 | goto out; | |
1216 | ||
d7b2a97e | 1217 | /* if orig_node is direct neighbor update neigh_node last_seen */ |
fc957275 | 1218 | if (orig_node == orig_neigh_node) |
d7b2a97e | 1219 | neigh_node->last_seen = jiffies; |
fc957275 | 1220 | |
d7b2a97e | 1221 | orig_node->last_seen = jiffies; |
fc957275 ML |
1222 | |
1223 | /* find packet count of corresponding one hop neighbor */ | |
bbad0a5e AQ |
1224 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
1225 | if_num = if_incoming->if_num; | |
1226 | orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
89652331 SW |
1227 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); |
1228 | if (neigh_ifinfo) { | |
1229 | neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; | |
044fa3ae | 1230 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
89652331 SW |
1231 | } else { |
1232 | neigh_rq_count = 0; | |
1233 | } | |
bbad0a5e | 1234 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
fc957275 ML |
1235 | |
1236 | /* pay attention to not get a value bigger than 100 % */ | |
c67893d1 SE |
1237 | if (orig_eq_count > neigh_rq_count) |
1238 | total_count = neigh_rq_count; | |
1239 | else | |
1240 | total_count = orig_eq_count; | |
fc957275 | 1241 | |
9cfc7bd6 SE |
1242 | /* if we have too few packets (too less data) we set tq_own to zero |
1243 | * if we receive too few packets it is not considered bidirectional | |
1244 | */ | |
42d0b044 SE |
1245 | if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
1246 | neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) | |
fc957275 ML |
1247 | tq_own = 0; |
1248 | else | |
1249 | /* neigh_node->real_packet_count is never zero as we | |
1250 | * only purge old information when getting new | |
9cfc7bd6 SE |
1251 | * information |
1252 | */ | |
42d0b044 | 1253 | tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
fc957275 | 1254 | |
21a1236b | 1255 | /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
fc957275 ML |
1256 | * affect the nearly-symmetric links only a little, but |
1257 | * punishes asymmetric links more. This will give a value | |
1258 | * between 0 and TQ_MAX_VALUE | |
1259 | */ | |
42d0b044 SE |
1260 | neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
1261 | neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; | |
1262 | neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1263 | BATADV_TQ_LOCAL_WINDOW_SIZE * | |
1264 | BATADV_TQ_LOCAL_WINDOW_SIZE; | |
1265 | inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; | |
1266 | inv_asym_penalty /= neigh_rq_max_cube; | |
1267 | tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; | |
1268 | ||
c0398768 SW |
1269 | /* penalize if the OGM is forwarded on the same interface. WiFi |
1270 | * interfaces and other half duplex devices suffer from throughput | |
1271 | * drops as they can't send and receive at the same time. | |
1272 | */ | |
1273 | tq_iface_penalty = BATADV_TQ_MAX_VALUE; | |
1274 | if (if_outgoing && (if_incoming == if_outgoing) && | |
1275 | batadv_is_wifi_netdev(if_outgoing->net_dev)) | |
1276 | tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, | |
1277 | bat_priv); | |
1278 | ||
1279 | combined_tq = batadv_ogm_packet->tq * | |
1280 | tq_own * | |
1281 | tq_asym_penalty * | |
1282 | tq_iface_penalty; | |
1283 | combined_tq /= BATADV_TQ_MAX_VALUE * | |
1284 | BATADV_TQ_MAX_VALUE * | |
1285 | BATADV_TQ_MAX_VALUE; | |
96412690 | 1286 | batadv_ogm_packet->tq = combined_tq; |
fc957275 | 1287 | |
39c75a51 | 1288 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
c0398768 | 1289 | "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 | 1290 | orig_node->orig, orig_neigh_node->orig, total_count, |
c0398768 SW |
1291 | neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, |
1292 | batadv_ogm_packet->tq, if_incoming->net_dev->name, | |
1293 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); | |
fc957275 ML |
1294 | |
1295 | /* if link has the minimum required transmission quality | |
9cfc7bd6 SE |
1296 | * consider it bidirectional |
1297 | */ | |
96412690 | 1298 | if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
4b426b10 | 1299 | ret = true; |
fc957275 ML |
1300 | |
1301 | out: | |
1302 | if (neigh_node) | |
25bb2509 | 1303 | batadv_neigh_node_put(neigh_node); |
fc957275 ML |
1304 | return ret; |
1305 | } | |
1306 | ||
7c24bbbe SW |
1307 | /** |
1308 | * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, | |
1309 | * adjust the sequence number and find out whether it is a duplicate | |
1310 | * @ethhdr: ethernet header of the packet | |
1311 | * @batadv_ogm_packet: OGM packet to be considered | |
1312 | * @if_incoming: interface on which the OGM packet was received | |
89652331 | 1313 | * @if_outgoing: interface for which the retransmission should be considered |
7c24bbbe | 1314 | * |
62fe710f | 1315 | * Return: duplicate status as enum batadv_dup_status |
fc957275 | 1316 | */ |
7c24bbbe | 1317 | static enum batadv_dup_status |
fe8bc396 | 1318 | batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
96412690 | 1319 | const struct batadv_ogm_packet *batadv_ogm_packet, |
89652331 SW |
1320 | const struct batadv_hard_iface *if_incoming, |
1321 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1322 | { |
56303d34 SE |
1323 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
1324 | struct batadv_orig_node *orig_node; | |
7351a482 | 1325 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; |
89652331 SW |
1326 | struct batadv_neigh_node *neigh_node; |
1327 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
4b426b10 | 1328 | bool is_dup; |
6b5e971a | 1329 | s32 seq_diff; |
4b426b10 | 1330 | bool need_update = false; |
7c24bbbe SW |
1331 | int set_mark; |
1332 | enum batadv_dup_status ret = BATADV_NO_DUP; | |
6b5e971a SE |
1333 | u32 seqno = ntohl(batadv_ogm_packet->seqno); |
1334 | u8 *neigh_addr; | |
1335 | u8 packet_count; | |
0538f759 | 1336 | unsigned long *bitmap; |
fc957275 | 1337 | |
bbad0a5e | 1338 | orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); |
fc957275 | 1339 | if (!orig_node) |
7c24bbbe | 1340 | return BATADV_NO_DUP; |
fc957275 | 1341 | |
7351a482 SW |
1342 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1343 | if (WARN_ON(!orig_ifinfo)) { | |
5d967310 | 1344 | batadv_orig_node_put(orig_node); |
7351a482 SW |
1345 | return 0; |
1346 | } | |
1347 | ||
bbad0a5e | 1348 | spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
7351a482 | 1349 | seq_diff = seqno - orig_ifinfo->last_real_seqno; |
fc957275 ML |
1350 | |
1351 | /* signalize caller that the packet is to be dropped. */ | |
1e5cc266 | 1352 | if (!hlist_empty(&orig_node->neigh_list) && |
30d3c511 | 1353 | batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1354 | BATADV_TQ_LOCAL_WINDOW_SIZE, |
1355 | &orig_ifinfo->batman_seqno_reset, NULL)) { | |
7c24bbbe | 1356 | ret = BATADV_PROTECTED; |
fc957275 | 1357 | goto out; |
7c24bbbe | 1358 | } |
fc957275 ML |
1359 | |
1360 | rcu_read_lock(); | |
89652331 SW |
1361 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { |
1362 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, | |
1363 | if_outgoing); | |
1364 | if (!neigh_ifinfo) | |
1365 | continue; | |
1366 | ||
1367 | neigh_addr = neigh_node->addr; | |
1368 | is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, | |
7351a482 | 1369 | orig_ifinfo->last_real_seqno, |
7c24bbbe SW |
1370 | seqno); |
1371 | ||
1eda58bf | 1372 | if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
89652331 | 1373 | neigh_node->if_incoming == if_incoming) { |
fc957275 | 1374 | set_mark = 1; |
7c24bbbe SW |
1375 | if (is_dup) |
1376 | ret = BATADV_NEIGH_DUP; | |
1377 | } else { | |
fc957275 | 1378 | set_mark = 0; |
7c24bbbe SW |
1379 | if (is_dup && (ret != BATADV_NEIGH_DUP)) |
1380 | ret = BATADV_ORIG_DUP; | |
1381 | } | |
fc957275 ML |
1382 | |
1383 | /* if the window moved, set the update flag. */ | |
89652331 | 1384 | bitmap = neigh_ifinfo->bat_iv.real_bits; |
0538f759 | 1385 | need_update |= batadv_bit_get_packet(bat_priv, bitmap, |
0f5f9322 | 1386 | seq_diff, set_mark); |
fc957275 | 1387 | |
89652331 | 1388 | packet_count = bitmap_weight(bitmap, |
bbb1f90e | 1389 | BATADV_TQ_LOCAL_WINDOW_SIZE); |
89652331 | 1390 | neigh_ifinfo->bat_iv.real_packet_count = packet_count; |
044fa3ae | 1391 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
fc957275 ML |
1392 | } |
1393 | rcu_read_unlock(); | |
1394 | ||
1395 | if (need_update) { | |
39c75a51 | 1396 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
7351a482 SW |
1397 | "%s updating last_seqno: old %u, new %u\n", |
1398 | if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", | |
1399 | orig_ifinfo->last_real_seqno, seqno); | |
1400 | orig_ifinfo->last_real_seqno = seqno; | |
fc957275 ML |
1401 | } |
1402 | ||
fc957275 | 1403 | out: |
bbad0a5e | 1404 | spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); |
5d967310 | 1405 | batadv_orig_node_put(orig_node); |
35f94779 | 1406 | batadv_orig_ifinfo_put(orig_ifinfo); |
fc957275 ML |
1407 | return ret; |
1408 | } | |
1409 | ||
7351a482 SW |
1410 | /** |
1411 | * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if | |
1412 | * @skb: the skb containing the OGM | |
95298a91 | 1413 | * @ogm_offset: offset from skb->data to start of ogm header |
7351a482 SW |
1414 | * @orig_node: the (cached) orig node for the originator of this OGM |
1415 | * @if_incoming: the interface where this packet was received | |
1416 | * @if_outgoing: the interface for which the packet should be considered | |
1417 | */ | |
1418 | static void | |
1419 | batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, | |
1420 | struct batadv_orig_node *orig_node, | |
1421 | struct batadv_hard_iface *if_incoming, | |
1422 | struct batadv_hard_iface *if_outgoing) | |
fc957275 | 1423 | { |
56303d34 | 1424 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
4ff1e2a7 | 1425 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
4f248cff SE |
1426 | struct batadv_neigh_node *router = NULL; |
1427 | struct batadv_neigh_node *router_router = NULL; | |
7351a482 SW |
1428 | struct batadv_orig_node *orig_neigh_node; |
1429 | struct batadv_orig_ifinfo *orig_ifinfo; | |
56303d34 | 1430 | struct batadv_neigh_node *orig_neigh_router = NULL; |
89652331 | 1431 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
7351a482 | 1432 | struct batadv_ogm_packet *ogm_packet; |
7c24bbbe | 1433 | enum batadv_dup_status dup_status; |
7351a482 SW |
1434 | bool is_from_best_next_hop = false; |
1435 | bool is_single_hop_neigh = false; | |
1436 | bool sameseq, similar_ttl; | |
1437 | struct sk_buff *skb_priv; | |
1438 | struct ethhdr *ethhdr; | |
6b5e971a | 1439 | u8 *prev_sender; |
4b426b10 | 1440 | bool is_bidirect; |
fc957275 | 1441 | |
7351a482 SW |
1442 | /* create a private copy of the skb, as some functions change tq value |
1443 | * and/or flags. | |
fc957275 | 1444 | */ |
7351a482 SW |
1445 | skb_priv = skb_copy(skb, GFP_ATOMIC); |
1446 | if (!skb_priv) | |
fc957275 ML |
1447 | return; |
1448 | ||
7351a482 SW |
1449 | ethhdr = eth_hdr(skb_priv); |
1450 | ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); | |
fc957275 | 1451 | |
7351a482 SW |
1452 | dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, |
1453 | if_incoming, if_outgoing); | |
1454 | if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) | |
75cd33f8 | 1455 | is_single_hop_neigh = true; |
fc957275 | 1456 | |
7c24bbbe | 1457 | if (dup_status == BATADV_PROTECTED) { |
39c75a51 | 1458 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1459 | "Drop packet: packet within seqno protection time (sender: %pM)\n", |
1460 | ethhdr->h_source); | |
fc957275 ML |
1461 | goto out; |
1462 | } | |
1463 | ||
7351a482 | 1464 | if (ogm_packet->tq == 0) { |
39c75a51 | 1465 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1466 | "Drop packet: originator packet with tq equal 0\n"); |
fc957275 ML |
1467 | goto out; |
1468 | } | |
1469 | ||
4ff1e2a7 ML |
1470 | if (is_single_hop_neigh) { |
1471 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, | |
1472 | ethhdr->h_source); | |
1473 | if (hardif_neigh) | |
1474 | hardif_neigh->last_seen = jiffies; | |
1475 | } | |
1476 | ||
7351a482 | 1477 | router = batadv_orig_router_get(orig_node, if_outgoing); |
0538f759 | 1478 | if (router) { |
7351a482 SW |
1479 | router_router = batadv_orig_router_get(router->orig_node, |
1480 | if_outgoing); | |
1481 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
0538f759 | 1482 | } |
fc957275 | 1483 | |
7351a482 | 1484 | if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && |
1eda58bf | 1485 | (batadv_compare_eth(router->addr, ethhdr->h_source))) |
13b2541b ML |
1486 | is_from_best_next_hop = true; |
1487 | ||
7351a482 | 1488 | prev_sender = ogm_packet->prev_sender; |
fc957275 ML |
1489 | /* avoid temporary routing loops */ |
1490 | if (router && router_router && | |
1eda58bf | 1491 | (batadv_compare_eth(router->addr, prev_sender)) && |
7351a482 | 1492 | !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && |
1eda58bf | 1493 | (batadv_compare_eth(router->addr, router_router->addr))) { |
39c75a51 | 1494 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1495 | "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
1496 | ethhdr->h_source); | |
fc957275 ML |
1497 | goto out; |
1498 | } | |
1499 | ||
7351a482 SW |
1500 | if (if_outgoing == BATADV_IF_DEFAULT) |
1501 | batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); | |
ef261577 | 1502 | |
fc957275 | 1503 | /* if sender is a direct neighbor the sender mac equals |
9cfc7bd6 SE |
1504 | * originator mac |
1505 | */ | |
c67893d1 SE |
1506 | if (is_single_hop_neigh) |
1507 | orig_neigh_node = orig_node; | |
1508 | else | |
bbad0a5e AQ |
1509 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, |
1510 | ethhdr->h_source); | |
c67893d1 | 1511 | |
fc957275 ML |
1512 | if (!orig_neigh_node) |
1513 | goto out; | |
1514 | ||
d56b1705 MH |
1515 | /* Update nc_nodes of the originator */ |
1516 | batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, | |
7351a482 | 1517 | ogm_packet, is_single_hop_neigh); |
d56b1705 | 1518 | |
7351a482 SW |
1519 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, |
1520 | if_outgoing); | |
fc957275 ML |
1521 | |
1522 | /* drop packet if sender is not a direct neighbor and if we | |
9cfc7bd6 SE |
1523 | * don't route towards it |
1524 | */ | |
fc957275 | 1525 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
39c75a51 | 1526 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1527 | "Drop packet: OGM via unknown neighbor!\n"); |
fc957275 ML |
1528 | goto out_neigh; |
1529 | } | |
1530 | ||
fe8bc396 | 1531 | is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
7351a482 SW |
1532 | ogm_packet, if_incoming, |
1533 | if_outgoing); | |
fc957275 | 1534 | |
fc957275 | 1535 | /* update ranking if it is not a duplicate or has the same |
9cfc7bd6 SE |
1536 | * seqno and similar ttl as the non-duplicate |
1537 | */ | |
7351a482 SW |
1538 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); |
1539 | if (!orig_ifinfo) | |
1540 | goto out_neigh; | |
1541 | ||
1542 | sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); | |
1543 | similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; | |
1544 | ||
7c24bbbe | 1545 | if (is_bidirect && ((dup_status == BATADV_NO_DUP) || |
7351a482 SW |
1546 | (sameseq && similar_ttl))) { |
1547 | batadv_iv_ogm_orig_update(bat_priv, orig_node, | |
1548 | orig_ifinfo, ethhdr, | |
1549 | ogm_packet, if_incoming, | |
1550 | if_outgoing, dup_status); | |
1551 | } | |
35f94779 | 1552 | batadv_orig_ifinfo_put(orig_ifinfo); |
fc957275 | 1553 | |
ef0a937f SW |
1554 | /* only forward for specific interface, not for the default one. */ |
1555 | if (if_outgoing == BATADV_IF_DEFAULT) | |
1556 | goto out_neigh; | |
1557 | ||
fc957275 ML |
1558 | /* is single hop (direct) neighbor */ |
1559 | if (is_single_hop_neigh) { | |
7351a482 SW |
1560 | /* OGMs from secondary interfaces should only scheduled once |
1561 | * per interface where it has been received, not multiple times | |
1562 | */ | |
1563 | if ((ogm_packet->ttl <= 2) && | |
1564 | (if_incoming != if_outgoing)) { | |
1565 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1566 | "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); | |
1567 | goto out_neigh; | |
1568 | } | |
fc957275 | 1569 | /* mark direct link on incoming interface */ |
7351a482 | 1570 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1571 | is_single_hop_neigh, |
ef0a937f SW |
1572 | is_from_best_next_hop, if_incoming, |
1573 | if_outgoing); | |
fc957275 | 1574 | |
39c75a51 | 1575 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1576 | "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
fc957275 ML |
1577 | goto out_neigh; |
1578 | } | |
1579 | ||
1580 | /* multihop originator */ | |
fe8bc396 | 1581 | if (!is_bidirect) { |
39c75a51 | 1582 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1583 | "Drop packet: not received via bidirectional link\n"); |
fc957275 ML |
1584 | goto out_neigh; |
1585 | } | |
1586 | ||
7c24bbbe | 1587 | if (dup_status == BATADV_NEIGH_DUP) { |
39c75a51 | 1588 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1589 | "Drop packet: duplicate packet received\n"); |
fc957275 ML |
1590 | goto out_neigh; |
1591 | } | |
1592 | ||
39c75a51 | 1593 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 1594 | "Forwarding packet: rebroadcast originator packet\n"); |
7351a482 | 1595 | batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, |
fe8bc396 | 1596 | is_single_hop_neigh, is_from_best_next_hop, |
ef0a937f | 1597 | if_incoming, if_outgoing); |
fc957275 ML |
1598 | |
1599 | out_neigh: | |
1600 | if ((orig_neigh_node) && (!is_single_hop_neigh)) | |
5d967310 | 1601 | batadv_orig_node_put(orig_neigh_node); |
fc957275 | 1602 | out: |
c1e517fb | 1603 | if (router_ifinfo) |
044fa3ae | 1604 | batadv_neigh_ifinfo_put(router_ifinfo); |
fc957275 | 1605 | if (router) |
25bb2509 | 1606 | batadv_neigh_node_put(router); |
fc957275 | 1607 | if (router_router) |
25bb2509 | 1608 | batadv_neigh_node_put(router_router); |
fc957275 | 1609 | if (orig_neigh_router) |
25bb2509 | 1610 | batadv_neigh_node_put(orig_neigh_router); |
4ff1e2a7 | 1611 | if (hardif_neigh) |
accadc35 | 1612 | batadv_hardif_neigh_put(hardif_neigh); |
fc957275 | 1613 | |
7351a482 SW |
1614 | kfree_skb(skb_priv); |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * batadv_iv_ogm_process - process an incoming batman iv OGM | |
1619 | * @skb: the skb containing the OGM | |
1620 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
1621 | * @if_incoming: the interface where this packet was receved | |
1622 | */ | |
1623 | static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
1624 | struct batadv_hard_iface *if_incoming) | |
1625 | { | |
1626 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1627 | struct batadv_orig_node *orig_neigh_node, *orig_node; | |
1628 | struct batadv_hard_iface *hard_iface; | |
1629 | struct batadv_ogm_packet *ogm_packet; | |
6b5e971a | 1630 | u32 if_incoming_seqno; |
7351a482 SW |
1631 | bool has_directlink_flag; |
1632 | struct ethhdr *ethhdr; | |
1633 | bool is_my_oldorig = false; | |
1634 | bool is_my_addr = false; | |
1635 | bool is_my_orig = false; | |
1636 | ||
1637 | ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); | |
1638 | ethhdr = eth_hdr(skb); | |
1639 | ||
1640 | /* Silently drop when the batman packet is actually not a | |
1641 | * correct packet. | |
1642 | * | |
1643 | * This might happen if a packet is padded (e.g. Ethernet has a | |
1644 | * minimum frame length of 64 byte) and the aggregation interprets | |
1645 | * it as an additional length. | |
1646 | * | |
1647 | * TODO: A more sane solution would be to have a bit in the | |
1648 | * batadv_ogm_packet to detect whether the packet is the last | |
1649 | * packet in an aggregation. Here we expect that the padding | |
1650 | * is always zero (or not 0x01) | |
1651 | */ | |
1652 | if (ogm_packet->packet_type != BATADV_IV_OGM) | |
1653 | return; | |
1654 | ||
1655 | /* could be changed by schedule_own_packet() */ | |
1656 | if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); | |
1657 | ||
1658 | if (ogm_packet->flags & BATADV_DIRECTLINK) | |
1659 | has_directlink_flag = true; | |
1660 | else | |
1661 | has_directlink_flag = false; | |
1662 | ||
1663 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1664 | "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", | |
1665 | ethhdr->h_source, if_incoming->net_dev->name, | |
1666 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
1667 | ogm_packet->prev_sender, ntohl(ogm_packet->seqno), | |
1668 | ogm_packet->tq, ogm_packet->ttl, | |
1669 | ogm_packet->version, has_directlink_flag); | |
1670 | ||
1671 | rcu_read_lock(); | |
1672 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1673 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1674 | continue; | |
1675 | ||
1676 | if (hard_iface->soft_iface != if_incoming->soft_iface) | |
1677 | continue; | |
1678 | ||
1679 | if (batadv_compare_eth(ethhdr->h_source, | |
1680 | hard_iface->net_dev->dev_addr)) | |
1681 | is_my_addr = true; | |
1682 | ||
1683 | if (batadv_compare_eth(ogm_packet->orig, | |
1684 | hard_iface->net_dev->dev_addr)) | |
1685 | is_my_orig = true; | |
1686 | ||
1687 | if (batadv_compare_eth(ogm_packet->prev_sender, | |
1688 | hard_iface->net_dev->dev_addr)) | |
1689 | is_my_oldorig = true; | |
1690 | } | |
1691 | rcu_read_unlock(); | |
1692 | ||
1693 | if (is_my_addr) { | |
1694 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1695 | "Drop packet: received my own broadcast (sender: %pM)\n", | |
1696 | ethhdr->h_source); | |
1697 | return; | |
1698 | } | |
1699 | ||
1700 | if (is_my_orig) { | |
1701 | unsigned long *word; | |
1702 | int offset; | |
6b5e971a SE |
1703 | s32 bit_pos; |
1704 | s16 if_num; | |
1705 | u8 *weight; | |
7351a482 SW |
1706 | |
1707 | orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, | |
1708 | ethhdr->h_source); | |
1709 | if (!orig_neigh_node) | |
1710 | return; | |
1711 | ||
1712 | /* neighbor has to indicate direct link and it has to | |
1713 | * come via the corresponding interface | |
1714 | * save packet seqno for bidirectional check | |
1715 | */ | |
1716 | if (has_directlink_flag && | |
1717 | batadv_compare_eth(if_incoming->net_dev->dev_addr, | |
1718 | ogm_packet->orig)) { | |
1719 | if_num = if_incoming->if_num; | |
1720 | offset = if_num * BATADV_NUM_WORDS; | |
1721 | ||
1722 | spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
32db6aaa | 1723 | word = &orig_neigh_node->bat_iv.bcast_own[offset]; |
7351a482 SW |
1724 | bit_pos = if_incoming_seqno - 2; |
1725 | bit_pos -= ntohl(ogm_packet->seqno); | |
1726 | batadv_set_bit(word, bit_pos); | |
1727 | weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; | |
1728 | *weight = bitmap_weight(word, | |
1729 | BATADV_TQ_LOCAL_WINDOW_SIZE); | |
1730 | spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); | |
1731 | } | |
1732 | ||
1733 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1734 | "Drop packet: originator packet from myself (via neighbor)\n"); | |
5d967310 | 1735 | batadv_orig_node_put(orig_neigh_node); |
7351a482 SW |
1736 | return; |
1737 | } | |
1738 | ||
1739 | if (is_my_oldorig) { | |
1740 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1741 | "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", | |
1742 | ethhdr->h_source); | |
1743 | return; | |
1744 | } | |
1745 | ||
1746 | if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { | |
1747 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1748 | "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", | |
1749 | ethhdr->h_source); | |
1750 | return; | |
1751 | } | |
1752 | ||
1753 | orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); | |
1754 | if (!orig_node) | |
1755 | return; | |
1756 | ||
1757 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, | |
1758 | if_incoming, BATADV_IF_DEFAULT); | |
1759 | ||
1760 | rcu_read_lock(); | |
1761 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1762 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1763 | continue; | |
1764 | ||
1765 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
1766 | continue; | |
1767 | ||
27353446 SE |
1768 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
1769 | continue; | |
1770 | ||
7351a482 SW |
1771 | batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, |
1772 | if_incoming, hard_iface); | |
27353446 SE |
1773 | |
1774 | batadv_hardif_put(hard_iface); | |
7351a482 SW |
1775 | } |
1776 | rcu_read_unlock(); | |
1777 | ||
5d967310 | 1778 | batadv_orig_node_put(orig_node); |
fc957275 ML |
1779 | } |
1780 | ||
fe8bc396 | 1781 | static int batadv_iv_ogm_receive(struct sk_buff *skb, |
56303d34 | 1782 | struct batadv_hard_iface *if_incoming) |
fc957275 | 1783 | { |
56303d34 | 1784 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
7351a482 | 1785 | struct batadv_ogm_packet *ogm_packet; |
6b5e971a | 1786 | u8 *packet_pos; |
7351a482 | 1787 | int ogm_offset; |
ef261577 | 1788 | bool ret; |
c3e29312 | 1789 | |
7e071c79 | 1790 | ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
c3e29312 ML |
1791 | if (!ret) |
1792 | return NET_RX_DROP; | |
fc957275 | 1793 | |
edbf12ba ML |
1794 | /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
1795 | * that does not have B.A.T.M.A.N. IV enabled ? | |
1796 | */ | |
fe8bc396 | 1797 | if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
edbf12ba ML |
1798 | return NET_RX_DROP; |
1799 | ||
d69909d2 SE |
1800 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1801 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
f8214865 MH |
1802 | skb->len + ETH_HLEN); |
1803 | ||
7351a482 SW |
1804 | ogm_offset = 0; |
1805 | ogm_packet = (struct batadv_ogm_packet *)skb->data; | |
fc957275 ML |
1806 | |
1807 | /* unpack the aggregated packets and process them one by one */ | |
7351a482 SW |
1808 | while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), |
1809 | ogm_packet->tvlv_len)) { | |
1810 | batadv_iv_ogm_process(skb, ogm_offset, if_incoming); | |
fc957275 | 1811 | |
7351a482 SW |
1812 | ogm_offset += BATADV_OGM_HLEN; |
1813 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
fc957275 | 1814 | |
7351a482 SW |
1815 | packet_pos = skb->data + ogm_offset; |
1816 | ogm_packet = (struct batadv_ogm_packet *)packet_pos; | |
b47506d9 | 1817 | } |
c3e29312 ML |
1818 | |
1819 | kfree_skb(skb); | |
1820 | return NET_RX_SUCCESS; | |
fc957275 | 1821 | } |
1c280471 | 1822 | |
1b371d13 SW |
1823 | /** |
1824 | * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table | |
89652331 SW |
1825 | * @orig_node: the orig_node for which the neighbors are printed |
1826 | * @if_outgoing: outgoing interface for these entries | |
1827 | * @seq: debugfs table seq_file struct | |
1828 | * | |
1829 | * Must be called while holding an rcu lock. | |
1830 | */ | |
1831 | static void | |
1832 | batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, | |
1833 | struct batadv_hard_iface *if_outgoing, | |
1834 | struct seq_file *seq) | |
1835 | { | |
1836 | struct batadv_neigh_node *neigh_node; | |
1837 | struct batadv_neigh_ifinfo *n_ifinfo; | |
1838 | ||
1839 | hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { | |
1840 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
1841 | if (!n_ifinfo) | |
1842 | continue; | |
1843 | ||
1844 | seq_printf(seq, " %pM (%3i)", | |
1845 | neigh_node->addr, | |
1846 | n_ifinfo->bat_iv.tq_avg); | |
1847 | ||
044fa3ae | 1848 | batadv_neigh_ifinfo_put(n_ifinfo); |
89652331 SW |
1849 | } |
1850 | } | |
1851 | ||
737a2a22 AQ |
1852 | /** |
1853 | * batadv_iv_ogm_orig_print - print the originator table | |
1854 | * @bat_priv: the bat priv with all the soft interface information | |
1855 | * @seq: debugfs table seq_file struct | |
cb1c92ec | 1856 | * @if_outgoing: the outgoing interface for which this should be printed |
737a2a22 AQ |
1857 | */ |
1858 | static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, | |
cb1c92ec SW |
1859 | struct seq_file *seq, |
1860 | struct batadv_hard_iface *if_outgoing) | |
737a2a22 | 1861 | { |
89652331 | 1862 | struct batadv_neigh_node *neigh_node; |
737a2a22 AQ |
1863 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
1864 | int last_seen_msecs, last_seen_secs; | |
1865 | struct batadv_orig_node *orig_node; | |
89652331 | 1866 | struct batadv_neigh_ifinfo *n_ifinfo; |
737a2a22 AQ |
1867 | unsigned long last_seen_jiffies; |
1868 | struct hlist_head *head; | |
1869 | int batman_count = 0; | |
6b5e971a | 1870 | u32 i; |
737a2a22 | 1871 | |
925a6f37 AQ |
1872 | seq_puts(seq, |
1873 | " Originator last-seen (#/255) Nexthop [outgoingIF]: Potential nexthops ...\n"); | |
737a2a22 AQ |
1874 | |
1875 | for (i = 0; i < hash->size; i++) { | |
1876 | head = &hash->table[i]; | |
1877 | ||
1878 | rcu_read_lock(); | |
1879 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
7351a482 | 1880 | neigh_node = batadv_orig_router_get(orig_node, |
cb1c92ec | 1881 | if_outgoing); |
737a2a22 AQ |
1882 | if (!neigh_node) |
1883 | continue; | |
1884 | ||
89652331 | 1885 | n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, |
cb1c92ec | 1886 | if_outgoing); |
89652331 SW |
1887 | if (!n_ifinfo) |
1888 | goto next; | |
1889 | ||
1890 | if (n_ifinfo->bat_iv.tq_avg == 0) | |
737a2a22 AQ |
1891 | goto next; |
1892 | ||
1893 | last_seen_jiffies = jiffies - orig_node->last_seen; | |
1894 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); | |
1895 | last_seen_secs = last_seen_msecs / 1000; | |
1896 | last_seen_msecs = last_seen_msecs % 1000; | |
1897 | ||
1898 | seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", | |
1899 | orig_node->orig, last_seen_secs, | |
89652331 | 1900 | last_seen_msecs, n_ifinfo->bat_iv.tq_avg, |
737a2a22 AQ |
1901 | neigh_node->addr, |
1902 | neigh_node->if_incoming->net_dev->name); | |
1903 | ||
cb1c92ec SW |
1904 | batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, |
1905 | seq); | |
737a2a22 AQ |
1906 | seq_puts(seq, "\n"); |
1907 | batman_count++; | |
1908 | ||
1909 | next: | |
25bb2509 | 1910 | batadv_neigh_node_put(neigh_node); |
89652331 | 1911 | if (n_ifinfo) |
044fa3ae | 1912 | batadv_neigh_ifinfo_put(n_ifinfo); |
737a2a22 AQ |
1913 | } |
1914 | rcu_read_unlock(); | |
1915 | } | |
1916 | ||
1917 | if (batman_count == 0) | |
1918 | seq_puts(seq, "No batman nodes in range ...\n"); | |
1919 | } | |
1920 | ||
7587405a ML |
1921 | /** |
1922 | * batadv_iv_hardif_neigh_print - print a single hop neighbour node | |
1923 | * @seq: neighbour table seq_file struct | |
1924 | * @hardif_neigh: hardif neighbour information | |
1925 | */ | |
1926 | static void | |
1927 | batadv_iv_hardif_neigh_print(struct seq_file *seq, | |
1928 | struct batadv_hardif_neigh_node *hardif_neigh) | |
1929 | { | |
1930 | int last_secs, last_msecs; | |
1931 | ||
1932 | last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000; | |
1933 | last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000; | |
1934 | ||
1935 | seq_printf(seq, " %10s %pM %4i.%03is\n", | |
1936 | hardif_neigh->if_incoming->net_dev->name, | |
1937 | hardif_neigh->addr, last_secs, last_msecs); | |
1938 | } | |
1939 | ||
1940 | /** | |
1941 | * batadv_iv_ogm_neigh_print - print the single hop neighbour list | |
1942 | * @bat_priv: the bat priv with all the soft interface information | |
1943 | * @seq: neighbour table seq_file struct | |
1944 | */ | |
1945 | static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, | |
1946 | struct seq_file *seq) | |
1947 | { | |
1948 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1949 | struct batadv_hardif_neigh_node *hardif_neigh; | |
1950 | struct batadv_hard_iface *hard_iface; | |
1951 | int batman_count = 0; | |
1952 | ||
925a6f37 | 1953 | seq_puts(seq, " IF Neighbor last-seen\n"); |
7587405a ML |
1954 | |
1955 | rcu_read_lock(); | |
1956 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1957 | if (hard_iface->soft_iface != net_dev) | |
1958 | continue; | |
1959 | ||
1960 | hlist_for_each_entry_rcu(hardif_neigh, | |
1961 | &hard_iface->neigh_list, list) { | |
1962 | batadv_iv_hardif_neigh_print(seq, hardif_neigh); | |
1963 | batman_count++; | |
1964 | } | |
1965 | } | |
1966 | rcu_read_unlock(); | |
1967 | ||
1968 | if (batman_count == 0) | |
1969 | seq_puts(seq, "No batman nodes in range ...\n"); | |
1970 | } | |
1971 | ||
a3285a8f AQ |
1972 | /** |
1973 | * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors | |
1974 | * @neigh1: the first neighbor object of the comparison | |
89652331 | 1975 | * @if_outgoing1: outgoing interface for the first neighbor |
a3285a8f | 1976 | * @neigh2: the second neighbor object of the comparison |
89652331 | 1977 | * @if_outgoing2: outgoing interface for the second neighbor |
a3285a8f | 1978 | * |
62fe710f | 1979 | * Return: a value less, equal to or greater than 0 if the metric via neigh1 is |
a3285a8f AQ |
1980 | * lower, the same as or higher than the metric via neigh2 |
1981 | */ | |
1982 | static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, | |
89652331 SW |
1983 | struct batadv_hard_iface *if_outgoing1, |
1984 | struct batadv_neigh_node *neigh2, | |
1985 | struct batadv_hard_iface *if_outgoing2) | |
a3285a8f | 1986 | { |
89652331 | 1987 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
6b5e971a | 1988 | u8 tq1, tq2; |
89652331 SW |
1989 | int diff; |
1990 | ||
1991 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); | |
1992 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
a3285a8f | 1993 | |
89652331 SW |
1994 | if (!neigh1_ifinfo || !neigh2_ifinfo) { |
1995 | diff = 0; | |
1996 | goto out; | |
1997 | } | |
a3285a8f | 1998 | |
89652331 SW |
1999 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; |
2000 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
2001 | diff = tq1 - tq2; | |
2002 | ||
2003 | out: | |
2004 | if (neigh1_ifinfo) | |
044fa3ae | 2005 | batadv_neigh_ifinfo_put(neigh1_ifinfo); |
89652331 | 2006 | if (neigh2_ifinfo) |
044fa3ae | 2007 | batadv_neigh_ifinfo_put(neigh2_ifinfo); |
89652331 SW |
2008 | |
2009 | return diff; | |
a3285a8f AQ |
2010 | } |
2011 | ||
c43c981e | 2012 | /** |
18165f6f SW |
2013 | * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better |
2014 | * than neigh2 from the metric prospective | |
c43c981e | 2015 | * @neigh1: the first neighbor object of the comparison |
95298a91 | 2016 | * @if_outgoing1: outgoing interface for the first neighbor |
c43c981e | 2017 | * @neigh2: the second neighbor object of the comparison |
89652331 | 2018 | * @if_outgoing2: outgoing interface for the second neighbor |
95298a91 | 2019 | * |
62fe710f | 2020 | * Return: true if the metric via neigh1 is equally good or better than |
89652331 | 2021 | * the metric via neigh2, false otherwise. |
c43c981e | 2022 | */ |
89652331 | 2023 | static bool |
18165f6f | 2024 | batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, |
89652331 SW |
2025 | struct batadv_hard_iface *if_outgoing1, |
2026 | struct batadv_neigh_node *neigh2, | |
2027 | struct batadv_hard_iface *if_outgoing2) | |
c43c981e | 2028 | { |
89652331 | 2029 | struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; |
6b5e971a | 2030 | u8 tq1, tq2; |
89652331 | 2031 | bool ret; |
c43c981e | 2032 | |
89652331 SW |
2033 | neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); |
2034 | neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); | |
2035 | ||
2036 | /* we can't say that the metric is better */ | |
2037 | if (!neigh1_ifinfo || !neigh2_ifinfo) { | |
2038 | ret = false; | |
2039 | goto out; | |
2040 | } | |
2041 | ||
2042 | tq1 = neigh1_ifinfo->bat_iv.tq_avg; | |
2043 | tq2 = neigh2_ifinfo->bat_iv.tq_avg; | |
2044 | ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; | |
2045 | ||
2046 | out: | |
2047 | if (neigh1_ifinfo) | |
044fa3ae | 2048 | batadv_neigh_ifinfo_put(neigh1_ifinfo); |
89652331 | 2049 | if (neigh2_ifinfo) |
044fa3ae | 2050 | batadv_neigh_ifinfo_put(neigh2_ifinfo); |
89652331 SW |
2051 | |
2052 | return ret; | |
c43c981e AQ |
2053 | } |
2054 | ||
56303d34 | 2055 | static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
519d3497 | 2056 | .name = "BATMAN_IV", |
fe8bc396 SE |
2057 | .bat_iface_enable = batadv_iv_ogm_iface_enable, |
2058 | .bat_iface_disable = batadv_iv_ogm_iface_disable, | |
2059 | .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, | |
2060 | .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, | |
2061 | .bat_ogm_schedule = batadv_iv_ogm_schedule, | |
2062 | .bat_ogm_emit = batadv_iv_ogm_emit, | |
a3285a8f | 2063 | .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, |
18165f6f | 2064 | .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob, |
7587405a | 2065 | .bat_neigh_print = batadv_iv_neigh_print, |
737a2a22 | 2066 | .bat_orig_print = batadv_iv_ogm_orig_print, |
d0015fdd AQ |
2067 | .bat_orig_free = batadv_iv_ogm_orig_free, |
2068 | .bat_orig_add_if = batadv_iv_ogm_orig_add_if, | |
2069 | .bat_orig_del_if = batadv_iv_ogm_orig_del_if, | |
1c280471 ML |
2070 | }; |
2071 | ||
81c524f7 | 2072 | int __init batadv_iv_init(void) |
1c280471 | 2073 | { |
c3e29312 ML |
2074 | int ret; |
2075 | ||
2076 | /* batman originator packet */ | |
acd34afa SE |
2077 | ret = batadv_recv_handler_register(BATADV_IV_OGM, |
2078 | batadv_iv_ogm_receive); | |
c3e29312 ML |
2079 | if (ret < 0) |
2080 | goto out; | |
2081 | ||
fe8bc396 | 2082 | ret = batadv_algo_register(&batadv_batman_iv); |
c3e29312 ML |
2083 | if (ret < 0) |
2084 | goto handler_unregister; | |
2085 | ||
2086 | goto out; | |
2087 | ||
2088 | handler_unregister: | |
acd34afa | 2089 | batadv_recv_handler_unregister(BATADV_IV_OGM); |
c3e29312 ML |
2090 | out: |
2091 | return ret; | |
1c280471 | 2092 | } |