Commit | Line | Data |
---|---|---|
0b873931 | 1 | /* Copyright (C) 2011-2013 B.A.T.M.A.N. contributors: |
23721387 SW |
2 | * |
3 | * Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
23721387 SW |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "hash.h" | |
22 | #include "hard-interface.h" | |
23 | #include "originator.h" | |
24 | #include "bridge_loop_avoidance.h" | |
20ff9d59 | 25 | #include "translation-table.h" |
23721387 SW |
26 | #include "send.h" |
27 | ||
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/crc16.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <net/arp.h> | |
32 | #include <linux/if_vlan.h> | |
33 | ||
3b300de3 | 34 | static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 35 | |
3b300de3 | 36 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
37 | static void |
38 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
39 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 SW |
40 | |
41 | /* return the index of the claim */ | |
3b300de3 | 42 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
23721387 | 43 | { |
712bbfe4 | 44 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 45 | uint32_t hash = 0; |
23721387 | 46 | |
07568d03 SW |
47 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
48 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
49 | |
50 | hash += (hash << 3); | |
51 | hash ^= (hash >> 11); | |
52 | hash += (hash << 15); | |
53 | ||
54 | return hash % size; | |
55 | } | |
56 | ||
57 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
58 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
59 | uint32_t size) | |
23721387 | 60 | { |
712bbfe4 | 61 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 62 | uint32_t hash = 0; |
23721387 | 63 | |
07568d03 SW |
64 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
65 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
66 | |
67 | hash += (hash << 3); | |
68 | hash ^= (hash >> 11); | |
69 | hash += (hash << 15); | |
70 | ||
71 | return hash % size; | |
72 | } | |
73 | ||
74 | ||
75 | /* compares address and vid of two backbone gws */ | |
3b300de3 SE |
76 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
77 | const void *data2) | |
23721387 | 78 | { |
bae98774 | 79 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 80 | hash_entry); |
bae98774 | 81 | const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2; |
23721387 | 82 | |
c76d1525 SW |
83 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
84 | return 0; | |
85 | ||
86 | if (gw1->vid != gw2->vid) | |
87 | return 0; | |
88 | ||
89 | return 1; | |
23721387 SW |
90 | } |
91 | ||
92 | /* compares address and vid of two claims */ | |
3b300de3 SE |
93 | static int batadv_compare_claim(const struct hlist_node *node, |
94 | const void *data2) | |
23721387 | 95 | { |
712bbfe4 | 96 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 97 | hash_entry); |
712bbfe4 | 98 | const struct batadv_bla_claim *cl1 = data1, *cl2 = data2; |
c76d1525 SW |
99 | |
100 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
101 | return 0; | |
102 | ||
103 | if (cl1->vid != cl2->vid) | |
104 | return 0; | |
23721387 | 105 | |
c76d1525 | 106 | return 1; |
23721387 SW |
107 | } |
108 | ||
109 | /* free a backbone gw */ | |
bae98774 ML |
110 | static void |
111 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) | |
23721387 SW |
112 | { |
113 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
114 | kfree_rcu(backbone_gw, rcu); | |
115 | } | |
116 | ||
117 | /* finally deinitialize the claim */ | |
3b300de3 | 118 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 119 | { |
712bbfe4 | 120 | struct batadv_bla_claim *claim; |
23721387 | 121 | |
712bbfe4 | 122 | claim = container_of(rcu, struct batadv_bla_claim, rcu); |
23721387 | 123 | |
3b300de3 | 124 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
125 | kfree(claim); |
126 | } | |
127 | ||
128 | /* free a claim, call claim_free_rcu if its the last reference */ | |
712bbfe4 | 129 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 SW |
130 | { |
131 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 132 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
133 | } |
134 | ||
9cfc7bd6 | 135 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
136 | * @data: search data (may be local/static data) |
137 | * | |
138 | * looks for a claim in the hash, and returns it if found | |
139 | * or NULL otherwise. | |
140 | */ | |
712bbfe4 ML |
141 | static struct batadv_bla_claim |
142 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
143 | struct batadv_bla_claim *data) | |
23721387 | 144 | { |
807736f6 | 145 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 SW |
146 | struct hlist_head *head; |
147 | struct hlist_node *node; | |
712bbfe4 ML |
148 | struct batadv_bla_claim *claim; |
149 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
150 | int index; |
151 | ||
152 | if (!hash) | |
153 | return NULL; | |
154 | ||
3b300de3 | 155 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
156 | head = &hash->table[index]; |
157 | ||
158 | rcu_read_lock(); | |
159 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
3b300de3 | 160 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
161 | continue; |
162 | ||
163 | if (!atomic_inc_not_zero(&claim->refcount)) | |
164 | continue; | |
165 | ||
166 | claim_tmp = claim; | |
167 | break; | |
168 | } | |
169 | rcu_read_unlock(); | |
170 | ||
171 | return claim_tmp; | |
172 | } | |
173 | ||
2c53040f BH |
174 | /** |
175 | * batadv_backbone_hash_find - looks for a claim in the hash | |
176 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
177 | * @addr: the address of the originator |
178 | * @vid: the VLAN ID | |
179 | * | |
2c53040f | 180 | * Returns claim if found or NULL otherwise. |
23721387 | 181 | */ |
bae98774 | 182 | static struct batadv_bla_backbone_gw * |
56303d34 SE |
183 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, |
184 | uint8_t *addr, short vid) | |
23721387 | 185 | { |
807736f6 | 186 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 SW |
187 | struct hlist_head *head; |
188 | struct hlist_node *node; | |
bae98774 ML |
189 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
190 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
191 | int index; |
192 | ||
193 | if (!hash) | |
194 | return NULL; | |
195 | ||
196 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
197 | search_entry.vid = vid; | |
198 | ||
3b300de3 | 199 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
200 | head = &hash->table[index]; |
201 | ||
202 | rcu_read_lock(); | |
203 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
3b300de3 SE |
204 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
205 | &search_entry)) | |
23721387 SW |
206 | continue; |
207 | ||
208 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
209 | continue; | |
210 | ||
211 | backbone_gw_tmp = backbone_gw; | |
212 | break; | |
213 | } | |
214 | rcu_read_unlock(); | |
215 | ||
216 | return backbone_gw_tmp; | |
217 | } | |
218 | ||
219 | /* delete all claims for a backbone */ | |
56303d34 | 220 | static void |
bae98774 | 221 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 222 | { |
5bf74e9c | 223 | struct batadv_hashtable *hash; |
23721387 SW |
224 | struct hlist_node *node, *node_tmp; |
225 | struct hlist_head *head; | |
712bbfe4 | 226 | struct batadv_bla_claim *claim; |
23721387 SW |
227 | int i; |
228 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
229 | ||
807736f6 | 230 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
231 | if (!hash) |
232 | return; | |
233 | ||
234 | for (i = 0; i < hash->size; i++) { | |
235 | head = &hash->table[i]; | |
236 | list_lock = &hash->list_locks[i]; | |
237 | ||
238 | spin_lock_bh(list_lock); | |
239 | hlist_for_each_entry_safe(claim, node, node_tmp, | |
240 | head, hash_entry) { | |
23721387 SW |
241 | if (claim->backbone_gw != backbone_gw) |
242 | continue; | |
243 | ||
3b300de3 | 244 | batadv_claim_free_ref(claim); |
23721387 SW |
245 | hlist_del_rcu(node); |
246 | } | |
247 | spin_unlock_bh(list_lock); | |
248 | } | |
249 | ||
250 | /* all claims gone, intialize CRC */ | |
3964f728 | 251 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
252 | } |
253 | ||
2c53040f BH |
254 | /** |
255 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
256 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
257 | * @orig: the mac address to be announced within the claim |
258 | * @vid: the VLAN ID | |
259 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 260 | */ |
56303d34 | 261 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
3b300de3 | 262 | short vid, int claimtype) |
23721387 SW |
263 | { |
264 | struct sk_buff *skb; | |
265 | struct ethhdr *ethhdr; | |
56303d34 | 266 | struct batadv_hard_iface *primary_if; |
23721387 SW |
267 | struct net_device *soft_iface; |
268 | uint8_t *hw_src; | |
96412690 | 269 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 270 | __be32 zeroip = 0; |
23721387 | 271 | |
e5d89254 | 272 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
273 | if (!primary_if) |
274 | return; | |
275 | ||
807736f6 | 276 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 277 | sizeof(local_claim_dest)); |
23721387 SW |
278 | local_claim_dest.type = claimtype; |
279 | ||
280 | soft_iface = primary_if->soft_iface; | |
281 | ||
282 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
283 | /* IP DST: 0.0.0.0 */ | |
284 | zeroip, | |
285 | primary_if->soft_iface, | |
286 | /* IP SRC: 0.0.0.0 */ | |
287 | zeroip, | |
288 | /* Ethernet DST: Broadcast */ | |
289 | NULL, | |
290 | /* Ethernet SRC/HW SRC: originator mac */ | |
291 | primary_if->net_dev->dev_addr, | |
99e966fc | 292 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 293 | * with XX = claim type |
38ef3d1d | 294 | * and YY:YY = group id |
23721387 SW |
295 | */ |
296 | (uint8_t *)&local_claim_dest); | |
297 | ||
298 | if (!skb) | |
299 | goto out; | |
300 | ||
301 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 302 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
303 | |
304 | /* now we pretend that the client would have sent this ... */ | |
305 | switch (claimtype) { | |
3eb8773e | 306 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
307 | /* normal claim frame |
308 | * set Ethernet SRC to the clients mac | |
309 | */ | |
310 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
39c75a51 | 311 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 312 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); |
23721387 | 313 | break; |
3eb8773e | 314 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
315 | /* unclaim frame |
316 | * set HW SRC to the clients mac | |
317 | */ | |
318 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 319 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
320 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
321 | vid); | |
23721387 | 322 | break; |
acd34afa | 323 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
324 | /* announcement frame |
325 | * set HW SRC to the special mac containg the crc | |
326 | */ | |
327 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 328 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
329 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
330 | ethhdr->h_source, vid); | |
23721387 | 331 | break; |
acd34afa | 332 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 333 | /* request frame |
99e966fc SW |
334 | * set HW SRC and header destination to the receiving backbone |
335 | * gws mac | |
23721387 SW |
336 | */ |
337 | memcpy(hw_src, mac, ETH_ALEN); | |
338 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 339 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
340 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", |
341 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 | 342 | break; |
23721387 SW |
343 | } |
344 | ||
345 | if (vid != -1) | |
346 | skb = vlan_insert_tag(skb, vid); | |
347 | ||
348 | skb_reset_mac_header(skb); | |
349 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
350 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
351 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
352 | skb->len + ETH_HLEN); | |
23721387 SW |
353 | soft_iface->last_rx = jiffies; |
354 | ||
355 | netif_rx(skb); | |
356 | out: | |
357 | if (primary_if) | |
e5d89254 | 358 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
359 | } |
360 | ||
2c53040f BH |
361 | /** |
362 | * batadv_bla_get_backbone_gw | |
363 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
364 | * @orig: the mac address of the originator |
365 | * @vid: the VLAN ID | |
366 | * | |
367 | * searches for the backbone gw or creates a new one if it could not | |
368 | * be found. | |
369 | */ | |
bae98774 | 370 | static struct batadv_bla_backbone_gw * |
56303d34 | 371 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, |
52aebd6a | 372 | short vid, bool own_backbone) |
23721387 | 373 | { |
bae98774 | 374 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 375 | struct batadv_orig_node *orig_node; |
23721387 SW |
376 | int hash_added; |
377 | ||
3b300de3 | 378 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
379 | |
380 | if (entry) | |
381 | return entry; | |
382 | ||
39c75a51 | 383 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
384 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
385 | orig, vid); | |
23721387 SW |
386 | |
387 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
388 | if (!entry) | |
389 | return NULL; | |
390 | ||
391 | entry->vid = vid; | |
392 | entry->lasttime = jiffies; | |
3964f728 | 393 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
394 | entry->bat_priv = bat_priv; |
395 | atomic_set(&entry->request_sent, 0); | |
28709878 | 396 | atomic_set(&entry->wait_periods, 0); |
23721387 SW |
397 | memcpy(entry->orig, orig, ETH_ALEN); |
398 | ||
399 | /* one for the hash, one for returning */ | |
400 | atomic_set(&entry->refcount, 2); | |
401 | ||
807736f6 | 402 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
403 | batadv_compare_backbone_gw, |
404 | batadv_choose_backbone_gw, entry, | |
405 | &entry->hash_entry); | |
23721387 SW |
406 | |
407 | if (unlikely(hash_added != 0)) { | |
408 | /* hash failed, free the structure */ | |
409 | kfree(entry); | |
410 | return NULL; | |
411 | } | |
412 | ||
20ff9d59 | 413 | /* this is a gateway now, remove any tt entries */ |
da641193 | 414 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 415 | if (orig_node) { |
08c36d3e SE |
416 | batadv_tt_global_del_orig(bat_priv, orig_node, |
417 | "became a backbone gateway"); | |
7d211efc | 418 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 419 | } |
52aebd6a | 420 | |
d807f272 | 421 | if (own_backbone) { |
52aebd6a SW |
422 | batadv_bla_send_announce(bat_priv, entry); |
423 | ||
d807f272 SW |
424 | /* this will be decreased in the worker thread */ |
425 | atomic_inc(&entry->request_sent); | |
28709878 | 426 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
427 | atomic_inc(&bat_priv->bla.num_requests); |
428 | } | |
429 | ||
23721387 SW |
430 | return entry; |
431 | } | |
432 | ||
433 | /* update or add the own backbone gw to make sure we announce | |
434 | * where we receive other backbone gws | |
435 | */ | |
56303d34 SE |
436 | static void |
437 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
438 | struct batadv_hard_iface *primary_if, | |
439 | short vid) | |
23721387 | 440 | { |
bae98774 | 441 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 442 | |
3b300de3 SE |
443 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
444 | primary_if->net_dev->dev_addr, | |
52aebd6a | 445 | vid, true); |
23721387 SW |
446 | if (unlikely(!backbone_gw)) |
447 | return; | |
448 | ||
449 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 450 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
451 | } |
452 | ||
9cfc7bd6 | 453 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
454 | * @vid: the vid where the request came on |
455 | * | |
456 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
457 | * to allow the requester another check if the CRC is correct now. | |
458 | */ | |
56303d34 SE |
459 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
460 | struct batadv_hard_iface *primary_if, | |
461 | short vid) | |
23721387 SW |
462 | { |
463 | struct hlist_node *node; | |
464 | struct hlist_head *head; | |
5bf74e9c | 465 | struct batadv_hashtable *hash; |
712bbfe4 | 466 | struct batadv_bla_claim *claim; |
bae98774 | 467 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
468 | int i; |
469 | ||
39c75a51 | 470 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 471 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 472 | |
3b300de3 SE |
473 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
474 | primary_if->net_dev->dev_addr, | |
475 | vid); | |
23721387 SW |
476 | if (!backbone_gw) |
477 | return; | |
478 | ||
807736f6 | 479 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
480 | for (i = 0; i < hash->size; i++) { |
481 | head = &hash->table[i]; | |
482 | ||
483 | rcu_read_lock(); | |
484 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
485 | /* only own claims are interesting */ | |
486 | if (claim->backbone_gw != backbone_gw) | |
487 | continue; | |
488 | ||
3b300de3 | 489 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 490 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
491 | } |
492 | rcu_read_unlock(); | |
493 | } | |
494 | ||
495 | /* finally, send an announcement frame */ | |
3b300de3 SE |
496 | batadv_bla_send_announce(bat_priv, backbone_gw); |
497 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
498 | } |
499 | ||
9cfc7bd6 | 500 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
501 | * |
502 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
503 | * After the request, it will repeat all of his own claims and finally | |
504 | * send an announcement claim with which we can check again. | |
505 | */ | |
bae98774 | 506 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
507 | { |
508 | /* first, remove all old entries */ | |
3b300de3 | 509 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 510 | |
39c75a51 SE |
511 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
512 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
513 | |
514 | /* send request */ | |
3b300de3 | 515 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 516 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
517 | |
518 | /* no local broadcasts should be sent or received, for now. */ | |
519 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 520 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
521 | atomic_set(&backbone_gw->request_sent, 1); |
522 | } | |
523 | } | |
524 | ||
9cfc7bd6 | 525 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
526 | * @backbone_gw: our backbone gateway which should be announced |
527 | * | |
528 | * This function sends an announcement. It is called from multiple | |
529 | * places. | |
530 | */ | |
56303d34 | 531 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 532 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
533 | { |
534 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 535 | __be16 crc; |
23721387 | 536 | |
3b300de3 | 537 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 538 | crc = htons(backbone_gw->crc); |
1a5852d8 | 539 | memcpy(&mac[4], &crc, 2); |
23721387 | 540 | |
3b300de3 | 541 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 542 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
543 | } |
544 | ||
2c53040f BH |
545 | /** |
546 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
547 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
548 | * @mac: the mac address of the claim |
549 | * @vid: the VLAN ID of the frame | |
550 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 551 | */ |
56303d34 SE |
552 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
553 | const uint8_t *mac, const short vid, | |
bae98774 | 554 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 555 | { |
712bbfe4 ML |
556 | struct batadv_bla_claim *claim; |
557 | struct batadv_bla_claim search_claim; | |
23721387 SW |
558 | int hash_added; |
559 | ||
560 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
561 | search_claim.vid = vid; | |
3b300de3 | 562 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
563 | |
564 | /* create a new claim entry if it does not exist yet. */ | |
565 | if (!claim) { | |
566 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
567 | if (!claim) | |
568 | return; | |
569 | ||
570 | memcpy(claim->addr, mac, ETH_ALEN); | |
571 | claim->vid = vid; | |
572 | claim->lasttime = jiffies; | |
573 | claim->backbone_gw = backbone_gw; | |
574 | ||
575 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 576 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
577 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
578 | mac, vid); | |
807736f6 | 579 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
580 | batadv_compare_claim, |
581 | batadv_choose_claim, claim, | |
582 | &claim->hash_entry); | |
23721387 SW |
583 | |
584 | if (unlikely(hash_added != 0)) { | |
585 | /* only local changes happened. */ | |
586 | kfree(claim); | |
587 | return; | |
588 | } | |
589 | } else { | |
590 | claim->lasttime = jiffies; | |
591 | if (claim->backbone_gw == backbone_gw) | |
592 | /* no need to register a new backbone */ | |
593 | goto claim_free_ref; | |
594 | ||
39c75a51 | 595 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
596 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
597 | mac, vid); | |
23721387 | 598 | |
bbb1f90e | 599 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 600 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
601 | } |
602 | /* set (new) backbone gw */ | |
603 | atomic_inc(&backbone_gw->refcount); | |
604 | claim->backbone_gw = backbone_gw; | |
605 | ||
606 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
607 | backbone_gw->lasttime = jiffies; | |
608 | ||
609 | claim_free_ref: | |
3b300de3 | 610 | batadv_claim_free_ref(claim); |
23721387 SW |
611 | } |
612 | ||
613 | /* Delete a claim from the claim hash which has the | |
614 | * given mac address and vid. | |
615 | */ | |
56303d34 SE |
616 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
617 | const uint8_t *mac, const short vid) | |
23721387 | 618 | { |
712bbfe4 | 619 | struct batadv_bla_claim search_claim, *claim; |
23721387 SW |
620 | |
621 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
622 | search_claim.vid = vid; | |
3b300de3 | 623 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
624 | if (!claim) |
625 | return; | |
626 | ||
39c75a51 SE |
627 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
628 | mac, vid); | |
23721387 | 629 | |
807736f6 | 630 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
631 | batadv_choose_claim, claim); |
632 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
633 | |
634 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
635 | ||
636 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 637 | batadv_claim_free_ref(claim); |
23721387 SW |
638 | } |
639 | ||
640 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 641 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
642 | uint8_t *an_addr, uint8_t *backbone_addr, |
643 | short vid) | |
23721387 | 644 | { |
bae98774 | 645 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
646 | uint16_t crc; |
647 | ||
3b300de3 | 648 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
649 | return 0; |
650 | ||
52aebd6a SW |
651 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
652 | false); | |
23721387 SW |
653 | |
654 | if (unlikely(!backbone_gw)) | |
655 | return 1; | |
656 | ||
657 | ||
658 | /* handle as ANNOUNCE frame */ | |
659 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 660 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 661 | |
39c75a51 | 662 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 663 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
1eda58bf | 664 | vid, backbone_gw->orig, crc); |
23721387 SW |
665 | |
666 | if (backbone_gw->crc != crc) { | |
39c75a51 | 667 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 668 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
1eda58bf SE |
669 | backbone_gw->orig, backbone_gw->vid, |
670 | backbone_gw->crc, crc); | |
23721387 | 671 | |
3b300de3 | 672 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
673 | } else { |
674 | /* if we have sent a request and the crc was OK, | |
675 | * we can allow traffic again. | |
676 | */ | |
677 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 678 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
679 | atomic_set(&backbone_gw->request_sent, 0); |
680 | } | |
681 | } | |
682 | ||
3b300de3 | 683 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
684 | return 1; |
685 | } | |
686 | ||
687 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
688 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
689 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
690 | uint8_t *backbone_addr, |
691 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
692 | { |
693 | /* check for REQUEST frame */ | |
1eda58bf | 694 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
695 | return 0; |
696 | ||
697 | /* sanity check, this should not happen on a normal switch, | |
698 | * we ignore it in this case. | |
699 | */ | |
1eda58bf | 700 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
701 | return 1; |
702 | ||
39c75a51 | 703 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
704 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
705 | vid, ethhdr->h_source); | |
23721387 | 706 | |
3b300de3 | 707 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
708 | return 1; |
709 | } | |
710 | ||
711 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
712 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
713 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
714 | uint8_t *backbone_addr, |
715 | uint8_t *claim_addr, short vid) | |
23721387 | 716 | { |
bae98774 | 717 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
718 | |
719 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
720 | if (primary_if && batadv_compare_eth(backbone_addr, |
721 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 722 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 723 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 724 | |
3b300de3 | 725 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
726 | |
727 | if (!backbone_gw) | |
728 | return 1; | |
729 | ||
730 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 731 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
732 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
733 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 734 | |
3b300de3 SE |
735 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
736 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
737 | return 1; |
738 | } | |
739 | ||
740 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
741 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
742 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
743 | uint8_t *backbone_addr, uint8_t *claim_addr, |
744 | short vid) | |
23721387 | 745 | { |
bae98774 | 746 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
747 | |
748 | /* register the gateway if not yet available, and add the claim. */ | |
749 | ||
52aebd6a SW |
750 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
751 | false); | |
23721387 SW |
752 | |
753 | if (unlikely(!backbone_gw)) | |
754 | return 1; | |
755 | ||
756 | /* this must be a CLAIM frame */ | |
3b300de3 | 757 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 758 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 759 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 760 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
761 | |
762 | /* TODO: we could call something like tt_local_del() here. */ | |
763 | ||
3b300de3 | 764 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
765 | return 1; |
766 | } | |
767 | ||
2c53040f BH |
768 | /** |
769 | * batadv_check_claim_group | |
770 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
771 | * @hw_src: the Hardware source in the ARP Header |
772 | * @hw_dst: the Hardware destination in the ARP Header | |
773 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
774 | * | |
775 | * checks if it is a claim packet and if its on the same group. | |
776 | * This function also applies the group ID of the sender | |
777 | * if it is in the same mesh. | |
778 | * | |
779 | * returns: | |
780 | * 2 - if it is a claim packet and on the same group | |
781 | * 1 - if is a claim packet from another group | |
782 | * 0 - if it is not a claim packet | |
783 | */ | |
56303d34 SE |
784 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
785 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
786 | uint8_t *hw_src, uint8_t *hw_dst, |
787 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
788 | { |
789 | uint8_t *backbone_addr; | |
56303d34 | 790 | struct batadv_orig_node *orig_node; |
96412690 | 791 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 792 | |
96412690 | 793 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 794 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d SW |
795 | |
796 | /* check if it is a claim packet in general */ | |
797 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
798 | sizeof(bla_dst->magic)) != 0) | |
799 | return 0; | |
800 | ||
801 | /* if announcement packet, use the source, | |
802 | * otherwise assume it is in the hw_src | |
803 | */ | |
804 | switch (bla_dst->type) { | |
3eb8773e | 805 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
806 | backbone_addr = hw_src; |
807 | break; | |
acd34afa SE |
808 | case BATADV_CLAIM_TYPE_REQUEST: |
809 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 810 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
811 | backbone_addr = ethhdr->h_source; |
812 | break; | |
813 | default: | |
814 | return 0; | |
815 | } | |
816 | ||
817 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 818 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
819 | return 0; |
820 | ||
821 | /* if its already the same group, it is fine. */ | |
822 | if (bla_dst->group == bla_dst_own->group) | |
823 | return 2; | |
824 | ||
825 | /* lets see if this originator is in our mesh */ | |
da641193 | 826 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
827 | |
828 | /* dont accept claims from gateways which are not in | |
829 | * the same mesh or group. | |
830 | */ | |
831 | if (!orig_node) | |
832 | return 1; | |
833 | ||
834 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
835 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 836 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 837 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 838 | ntohs(bla_dst->group)); |
38ef3d1d SW |
839 | bla_dst_own->group = bla_dst->group; |
840 | } | |
841 | ||
7d211efc | 842 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
843 | |
844 | return 2; | |
845 | } | |
846 | ||
847 | ||
9cfc7bd6 | 848 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
849 | * @skb: the frame to be checked |
850 | * | |
851 | * Check if this is a claim frame, and process it accordingly. | |
852 | * | |
853 | * returns 1 if it was a claim frame, otherwise return 0 to | |
854 | * tell the callee that it can use the frame on its own. | |
855 | */ | |
56303d34 SE |
856 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
857 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 858 | struct sk_buff *skb) |
23721387 SW |
859 | { |
860 | struct ethhdr *ethhdr; | |
861 | struct vlan_ethhdr *vhdr; | |
862 | struct arphdr *arphdr; | |
863 | uint8_t *hw_src, *hw_dst; | |
96412690 | 864 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
865 | uint16_t proto; |
866 | int headlen; | |
867 | short vid = -1; | |
38ef3d1d | 868 | int ret; |
23721387 SW |
869 | |
870 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
871 | ||
872 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
873 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
874 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
875 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
876 | headlen = sizeof(*vhdr); | |
877 | } else { | |
878 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 879 | headlen = ETH_HLEN; |
23721387 SW |
880 | } |
881 | ||
882 | if (proto != ETH_P_ARP) | |
883 | return 0; /* not a claim frame */ | |
884 | ||
885 | /* this must be a ARP frame. check if it is a claim. */ | |
886 | ||
887 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
888 | return 0; | |
889 | ||
890 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
891 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
892 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
893 | ||
894 | /* Check whether the ARP frame carries a valid | |
895 | * IP information | |
896 | */ | |
23721387 SW |
897 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
898 | return 0; | |
899 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
900 | return 0; | |
901 | if (arphdr->ar_hln != ETH_ALEN) | |
902 | return 0; | |
903 | if (arphdr->ar_pln != 4) | |
904 | return 0; | |
905 | ||
906 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
907 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 908 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
909 | |
910 | /* check if it is a claim frame. */ | |
3b300de3 SE |
911 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
912 | ethhdr); | |
38ef3d1d | 913 | if (ret == 1) |
39c75a51 | 914 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
915 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
916 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
917 | |
918 | if (ret < 2) | |
919 | return ret; | |
23721387 SW |
920 | |
921 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 922 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
923 | |
924 | /* check for the different types of claim frames ... */ | |
925 | switch (bla_dst->type) { | |
3eb8773e | 926 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
927 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
928 | ethhdr->h_source, vid)) | |
23721387 SW |
929 | return 1; |
930 | break; | |
3eb8773e | 931 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
932 | if (batadv_handle_unclaim(bat_priv, primary_if, |
933 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
934 | return 1; |
935 | break; | |
936 | ||
acd34afa | 937 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
938 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
939 | vid)) | |
23721387 SW |
940 | return 1; |
941 | break; | |
acd34afa | 942 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
943 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
944 | vid)) | |
23721387 SW |
945 | return 1; |
946 | break; | |
947 | } | |
948 | ||
39c75a51 | 949 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
950 | "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
951 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
952 | return 1; |
953 | } | |
954 | ||
955 | /* Check when we last heard from other nodes, and remove them in case of | |
956 | * a time out, or clean all backbone gws if now is set. | |
957 | */ | |
56303d34 | 958 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 959 | { |
bae98774 | 960 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
961 | struct hlist_node *node, *node_tmp; |
962 | struct hlist_head *head; | |
5bf74e9c | 963 | struct batadv_hashtable *hash; |
23721387 SW |
964 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
965 | int i; | |
966 | ||
807736f6 | 967 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
968 | if (!hash) |
969 | return; | |
970 | ||
971 | for (i = 0; i < hash->size; i++) { | |
972 | head = &hash->table[i]; | |
973 | list_lock = &hash->list_locks[i]; | |
974 | ||
975 | spin_lock_bh(list_lock); | |
976 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
977 | head, hash_entry) { | |
978 | if (now) | |
979 | goto purge_now; | |
1eda58bf | 980 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 981 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
982 | continue; |
983 | ||
39c75a51 | 984 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
985 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
986 | backbone_gw->orig); | |
23721387 SW |
987 | |
988 | purge_now: | |
989 | /* don't wait for the pending request anymore */ | |
990 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 991 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 992 | |
3b300de3 | 993 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
994 | |
995 | hlist_del_rcu(node); | |
3b300de3 | 996 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
997 | } |
998 | spin_unlock_bh(list_lock); | |
999 | } | |
1000 | } | |
1001 | ||
2c53040f BH |
1002 | /** |
1003 | * batadv_bla_purge_claims | |
1004 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1005 | * @primary_if: the selected primary interface, may be NULL if now is set |
1006 | * @now: whether the whole hash shall be wiped now | |
1007 | * | |
1008 | * Check when we heard last time from our own claims, and remove them in case of | |
1009 | * a time out, or clean all claims if now is set | |
1010 | */ | |
56303d34 SE |
1011 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1012 | struct batadv_hard_iface *primary_if, | |
1013 | int now) | |
23721387 | 1014 | { |
712bbfe4 | 1015 | struct batadv_bla_claim *claim; |
23721387 SW |
1016 | struct hlist_node *node; |
1017 | struct hlist_head *head; | |
5bf74e9c | 1018 | struct batadv_hashtable *hash; |
23721387 SW |
1019 | int i; |
1020 | ||
807736f6 | 1021 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1022 | if (!hash) |
1023 | return; | |
1024 | ||
1025 | for (i = 0; i < hash->size; i++) { | |
1026 | head = &hash->table[i]; | |
1027 | ||
1028 | rcu_read_lock(); | |
1029 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1030 | if (now) | |
1031 | goto purge_now; | |
1eda58bf SE |
1032 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1033 | primary_if->net_dev->dev_addr)) | |
23721387 | 1034 | continue; |
1eda58bf | 1035 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1036 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1037 | continue; |
1038 | ||
39c75a51 | 1039 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1040 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1041 | claim->addr, claim->vid); | |
23721387 SW |
1042 | |
1043 | purge_now: | |
3b300de3 SE |
1044 | batadv_handle_unclaim(bat_priv, primary_if, |
1045 | claim->backbone_gw->orig, | |
1046 | claim->addr, claim->vid); | |
23721387 SW |
1047 | } |
1048 | rcu_read_unlock(); | |
1049 | } | |
1050 | } | |
1051 | ||
2c53040f BH |
1052 | /** |
1053 | * batadv_bla_update_orig_address | |
1054 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1055 | * @primary_if: the new selected primary_if |
1056 | * @oldif: the old primary interface, may be NULL | |
1057 | * | |
1058 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1059 | */ |
56303d34 SE |
1060 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1061 | struct batadv_hard_iface *primary_if, | |
1062 | struct batadv_hard_iface *oldif) | |
23721387 | 1063 | { |
bae98774 | 1064 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
1065 | struct hlist_node *node; |
1066 | struct hlist_head *head; | |
5bf74e9c | 1067 | struct batadv_hashtable *hash; |
807736f6 | 1068 | __be16 group; |
23721387 SW |
1069 | int i; |
1070 | ||
38ef3d1d | 1071 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1072 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1073 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1074 | |
23721387 | 1075 | if (!oldif) { |
3b300de3 SE |
1076 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1077 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1078 | return; |
1079 | } | |
1080 | ||
807736f6 | 1081 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1082 | if (!hash) |
1083 | return; | |
1084 | ||
1085 | for (i = 0; i < hash->size; i++) { | |
1086 | head = &hash->table[i]; | |
1087 | ||
1088 | rcu_read_lock(); | |
1089 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1090 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1091 | if (!batadv_compare_eth(backbone_gw->orig, |
1092 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1093 | continue; |
1094 | ||
1095 | memcpy(backbone_gw->orig, | |
1096 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1097 | /* send an announce frame so others will ask for our | |
1098 | * claims and update their tables. | |
1099 | */ | |
3b300de3 | 1100 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1101 | } |
1102 | rcu_read_unlock(); | |
1103 | } | |
1104 | } | |
1105 | ||
23721387 SW |
1106 | /* periodic work to do: |
1107 | * * purge structures when they are too old | |
1108 | * * send announcements | |
1109 | */ | |
3b300de3 | 1110 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1111 | { |
bbb1f90e | 1112 | struct delayed_work *delayed_work; |
56303d34 | 1113 | struct batadv_priv *bat_priv; |
807736f6 | 1114 | struct batadv_priv_bla *priv_bla; |
23721387 SW |
1115 | struct hlist_node *node; |
1116 | struct hlist_head *head; | |
bae98774 | 1117 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1118 | struct batadv_hashtable *hash; |
56303d34 | 1119 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1120 | int i; |
1121 | ||
bbb1f90e | 1122 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1123 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1124 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1125 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1126 | if (!primary_if) |
1127 | goto out; | |
1128 | ||
3b300de3 SE |
1129 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1130 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1131 | |
1132 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1133 | goto out; | |
1134 | ||
807736f6 | 1135 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1136 | if (!hash) |
1137 | goto out; | |
1138 | ||
1139 | for (i = 0; i < hash->size; i++) { | |
1140 | head = &hash->table[i]; | |
1141 | ||
1142 | rcu_read_lock(); | |
1143 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1144 | if (!batadv_compare_eth(backbone_gw->orig, |
1145 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1146 | continue; |
1147 | ||
1148 | backbone_gw->lasttime = jiffies; | |
1149 | ||
3b300de3 | 1150 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1151 | |
1152 | /* request_sent is only set after creation to avoid | |
1153 | * problems when we are not yet known as backbone gw | |
1154 | * in the backbone. | |
1155 | * | |
28709878 SW |
1156 | * We can reset this now after we waited some periods |
1157 | * to give bridge forward delays and bla group forming | |
1158 | * some grace time. | |
d807f272 SW |
1159 | */ |
1160 | ||
1161 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1162 | continue; | |
1163 | ||
28709878 SW |
1164 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1165 | continue; | |
1166 | ||
d807f272 SW |
1167 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1168 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1169 | } |
1170 | rcu_read_unlock(); | |
1171 | } | |
1172 | out: | |
1173 | if (primary_if) | |
e5d89254 | 1174 | batadv_hardif_free_ref(primary_if); |
23721387 | 1175 | |
72414442 AQ |
1176 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1177 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1178 | } |
1179 | ||
5d52dad2 SE |
1180 | /* The hash for claim and backbone hash receive the same key because they |
1181 | * are getting initialized by hash_new with the same key. Reinitializing | |
1182 | * them with to different keys to allow nested locking without generating | |
1183 | * lockdep warnings | |
1184 | */ | |
3b300de3 SE |
1185 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1186 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1187 | |
23721387 | 1188 | /* initialize all bla structures */ |
56303d34 | 1189 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1190 | { |
fe2da6ff | 1191 | int i; |
38ef3d1d | 1192 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1193 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1194 | uint16_t crc; |
1195 | unsigned long entrytime; | |
fe2da6ff | 1196 | |
7dac7b76 LL |
1197 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1198 | ||
39c75a51 | 1199 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1200 | |
38ef3d1d | 1201 | /* setting claim destination address */ |
807736f6 SE |
1202 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1203 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1204 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1205 | if (primary_if) { |
807736f6 SE |
1206 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1207 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1208 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1209 | } else { |
807736f6 | 1210 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1211 | } |
1212 | ||
fe2da6ff | 1213 | /* initialize the duplicate list */ |
807736f6 | 1214 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1215 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1216 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1217 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1218 | |
807736f6 | 1219 | if (bat_priv->bla.claim_hash) |
5346c35e | 1220 | return 0; |
23721387 | 1221 | |
807736f6 SE |
1222 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1223 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1224 | |
807736f6 | 1225 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1226 | return -ENOMEM; |
23721387 | 1227 | |
807736f6 | 1228 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1229 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1230 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1231 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1232 | |
39c75a51 | 1233 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1234 | |
72414442 AQ |
1235 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1236 | ||
1237 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1238 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1239 | return 0; |
23721387 SW |
1240 | } |
1241 | ||
2c53040f BH |
1242 | /** |
1243 | * batadv_bla_check_bcast_duplist | |
1244 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1245 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1246 | * |
1247 | * check if it is on our broadcast list. Another gateway might | |
1248 | * have sent the same packet because it is connected to the same backbone, | |
1249 | * so we have to remove this duplicate. | |
1250 | * | |
1251 | * This is performed by checking the CRC, which will tell us | |
1252 | * with a good chance that it is the same packet. If it is furthermore | |
1253 | * sent by another host, drop it. We allow equal packets from | |
1254 | * the same host however as this might be intended. | |
9cfc7bd6 | 1255 | */ |
56303d34 | 1256 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1257 | struct sk_buff *skb) |
fe2da6ff | 1258 | { |
004e86fc SW |
1259 | int i, curr, ret = 0; |
1260 | __be32 crc; | |
1261 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1262 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1263 | |
004e86fc | 1264 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1265 | |
1266 | /* calculate the crc ... */ | |
004e86fc | 1267 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1268 | |
7dac7b76 LL |
1269 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1270 | ||
42d0b044 | 1271 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1272 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1273 | curr %= BATADV_DUPLIST_SIZE; | |
1274 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1275 | |
1276 | /* we can stop searching if the entry is too old ; | |
1277 | * later entries will be even older | |
1278 | */ | |
42d0b044 SE |
1279 | if (batadv_has_timed_out(entry->entrytime, |
1280 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1281 | break; |
1282 | ||
1283 | if (entry->crc != crc) | |
1284 | continue; | |
1285 | ||
1eda58bf | 1286 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1287 | continue; |
1288 | ||
1289 | /* this entry seems to match: same crc, not too old, | |
1290 | * and from another gw. therefore return 1 to forbid it. | |
1291 | */ | |
7dac7b76 LL |
1292 | ret = 1; |
1293 | goto out; | |
fe2da6ff | 1294 | } |
7dac7b76 LL |
1295 | /* not found, add a new entry (overwrite the oldest entry) |
1296 | * and allow it, its the first occurence. | |
1297 | */ | |
807736f6 | 1298 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1299 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1300 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1301 | entry->crc = crc; |
1302 | entry->entrytime = jiffies; | |
1303 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
807736f6 | 1304 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1305 | |
7dac7b76 LL |
1306 | out: |
1307 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1308 | ||
1309 | return ret; | |
fe2da6ff SW |
1310 | } |
1311 | ||
1312 | ||
1313 | ||
9cfc7bd6 | 1314 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1315 | * @orig: originator mac address |
1316 | * | |
1317 | * check if the originator is a gateway for any VLAN ID. | |
1318 | * | |
1319 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1320 | */ |
56303d34 | 1321 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1322 | { |
807736f6 | 1323 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 SW |
1324 | struct hlist_head *head; |
1325 | struct hlist_node *node; | |
bae98774 | 1326 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1327 | int i; |
1328 | ||
1329 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1330 | return 0; | |
1331 | ||
1332 | if (!hash) | |
1333 | return 0; | |
1334 | ||
1335 | for (i = 0; i < hash->size; i++) { | |
1336 | head = &hash->table[i]; | |
1337 | ||
1338 | rcu_read_lock(); | |
1339 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1340 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1341 | rcu_read_unlock(); |
1342 | return 1; | |
1343 | } | |
1344 | } | |
1345 | rcu_read_unlock(); | |
1346 | } | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | ||
2c53040f BH |
1352 | /** |
1353 | * batadv_bla_is_backbone_gw | |
1354 | * @skb: the frame to be checked | |
23721387 SW |
1355 | * @orig_node: the orig_node of the frame |
1356 | * @hdr_size: maximum length of the frame | |
1357 | * | |
1358 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1359 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1360 | * returns 0. | |
23721387 | 1361 | */ |
08adf151 | 1362 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1363 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1364 | { |
1365 | struct ethhdr *ethhdr; | |
1366 | struct vlan_ethhdr *vhdr; | |
bae98774 | 1367 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
1368 | short vid = -1; |
1369 | ||
1370 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1371 | return 0; | |
1372 | ||
1373 | /* first, find out the vid. */ | |
0d125074 | 1374 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1375 | return 0; |
1376 | ||
1377 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1378 | ||
1379 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1380 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1381 | return 0; | |
1382 | ||
c67893d1 | 1383 | vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size); |
23721387 SW |
1384 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; |
1385 | } | |
1386 | ||
1387 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1388 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1389 | orig_node->orig, vid); | |
23721387 SW |
1390 | if (!backbone_gw) |
1391 | return 0; | |
1392 | ||
3b300de3 | 1393 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1394 | return 1; |
1395 | } | |
1396 | ||
1397 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1398 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1399 | { |
56303d34 | 1400 | struct batadv_hard_iface *primary_if; |
23721387 | 1401 | |
807736f6 | 1402 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1403 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1404 | |
807736f6 | 1405 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1406 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1407 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1408 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1409 | } |
807736f6 | 1410 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1411 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1412 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1413 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1414 | } |
1415 | if (primary_if) | |
e5d89254 | 1416 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1417 | } |
1418 | ||
2c53040f BH |
1419 | /** |
1420 | * batadv_bla_rx | |
1421 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1422 | * @skb: the frame to be checked |
1423 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1424 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1425 | * |
1426 | * bla_rx avoidance checks if: | |
1427 | * * we have to race for a claim | |
1428 | * * if the frame is allowed on the LAN | |
1429 | * | |
1430 | * in these cases, the skb is further handled by this function and | |
1431 | * returns 1, otherwise it returns 0 and the caller shall further | |
1432 | * process the skb. | |
23721387 | 1433 | */ |
04c9f416 DM |
1434 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, |
1435 | bool is_bcast) | |
23721387 SW |
1436 | { |
1437 | struct ethhdr *ethhdr; | |
712bbfe4 | 1438 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1439 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1440 | int ret; |
1441 | ||
1442 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1443 | ||
e5d89254 | 1444 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1445 | if (!primary_if) |
1446 | goto handled; | |
1447 | ||
1448 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1449 | goto allow; | |
1450 | ||
1451 | ||
807736f6 | 1452 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1453 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1454 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1455 | goto handled; |
1456 | ||
1457 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1458 | search_claim.vid = vid; | |
3b300de3 | 1459 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1460 | |
1461 | if (!claim) { | |
1462 | /* possible optimization: race for a claim */ | |
1463 | /* No claim exists yet, claim it for us! | |
1464 | */ | |
3b300de3 SE |
1465 | batadv_handle_claim(bat_priv, primary_if, |
1466 | primary_if->net_dev->dev_addr, | |
1467 | ethhdr->h_source, vid); | |
23721387 SW |
1468 | goto allow; |
1469 | } | |
1470 | ||
1471 | /* if it is our own claim ... */ | |
1eda58bf SE |
1472 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1473 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1474 | /* ... allow it in any case */ |
1475 | claim->lasttime = jiffies; | |
1476 | goto allow; | |
1477 | } | |
1478 | ||
1479 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1480 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1481 | /* ... drop it. the responsible gateway is in charge. | |
1482 | * | |
1483 | * We need to check is_bcast because with the gateway | |
1484 | * feature, broadcasts (like DHCP requests) may be sent | |
1485 | * using a unicast packet type. | |
1486 | */ | |
23721387 SW |
1487 | goto handled; |
1488 | } else { | |
1489 | /* seems the client considers us as its best gateway. | |
1490 | * send a claim and update the claim table | |
1491 | * immediately. | |
1492 | */ | |
3b300de3 SE |
1493 | batadv_handle_claim(bat_priv, primary_if, |
1494 | primary_if->net_dev->dev_addr, | |
1495 | ethhdr->h_source, vid); | |
23721387 SW |
1496 | goto allow; |
1497 | } | |
1498 | allow: | |
3b300de3 | 1499 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1500 | ret = 0; |
1501 | goto out; | |
1502 | ||
1503 | handled: | |
1504 | kfree_skb(skb); | |
1505 | ret = 1; | |
1506 | ||
1507 | out: | |
1508 | if (primary_if) | |
e5d89254 | 1509 | batadv_hardif_free_ref(primary_if); |
23721387 | 1510 | if (claim) |
3b300de3 | 1511 | batadv_claim_free_ref(claim); |
23721387 SW |
1512 | return ret; |
1513 | } | |
1514 | ||
2c53040f BH |
1515 | /** |
1516 | * batadv_bla_tx | |
1517 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1518 | * @skb: the frame to be checked |
1519 | * @vid: the VLAN ID of the frame | |
1520 | * | |
1521 | * bla_tx checks if: | |
1522 | * * a claim was received which has to be processed | |
1523 | * * the frame is allowed on the mesh | |
1524 | * | |
1525 | * in these cases, the skb is further handled by this function and | |
1526 | * returns 1, otherwise it returns 0 and the caller shall further | |
1527 | * process the skb. | |
23721387 | 1528 | */ |
56303d34 | 1529 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1530 | { |
1531 | struct ethhdr *ethhdr; | |
712bbfe4 | 1532 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1533 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1534 | int ret = 0; |
1535 | ||
e5d89254 | 1536 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1537 | if (!primary_if) |
1538 | goto out; | |
1539 | ||
1540 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1541 | goto allow; | |
1542 | ||
1543 | /* in VLAN case, the mac header might not be set. */ | |
1544 | skb_reset_mac_header(skb); | |
1545 | ||
3b300de3 | 1546 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1547 | goto handled; |
1548 | ||
1549 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1550 | ||
807736f6 | 1551 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1552 | /* don't allow broadcasts while requests are in flight */ |
1553 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1554 | goto handled; | |
1555 | ||
1556 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1557 | search_claim.vid = vid; | |
1558 | ||
3b300de3 | 1559 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1560 | |
1561 | /* if no claim exists, allow it. */ | |
1562 | if (!claim) | |
1563 | goto allow; | |
1564 | ||
1565 | /* check if we are responsible. */ | |
1eda58bf SE |
1566 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1567 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1568 | /* if yes, the client has roamed and we have |
1569 | * to unclaim it. | |
1570 | */ | |
3b300de3 SE |
1571 | batadv_handle_unclaim(bat_priv, primary_if, |
1572 | primary_if->net_dev->dev_addr, | |
1573 | ethhdr->h_source, vid); | |
23721387 SW |
1574 | goto allow; |
1575 | } | |
1576 | ||
1577 | /* check if it is a multicast/broadcast frame */ | |
1578 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1579 | /* drop it. the responsible gateway has forwarded it into | |
1580 | * the backbone network. | |
1581 | */ | |
1582 | goto handled; | |
1583 | } else { | |
1584 | /* we must allow it. at least if we are | |
1585 | * responsible for the DESTINATION. | |
1586 | */ | |
1587 | goto allow; | |
1588 | } | |
1589 | allow: | |
3b300de3 | 1590 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1591 | ret = 0; |
1592 | goto out; | |
1593 | handled: | |
1594 | ret = 1; | |
1595 | out: | |
1596 | if (primary_if) | |
e5d89254 | 1597 | batadv_hardif_free_ref(primary_if); |
23721387 | 1598 | if (claim) |
3b300de3 | 1599 | batadv_claim_free_ref(claim); |
23721387 SW |
1600 | return ret; |
1601 | } | |
9bf8e4d4 | 1602 | |
08adf151 | 1603 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1604 | { |
1605 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1606 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1607 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1608 | struct batadv_bla_claim *claim; |
56303d34 | 1609 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 SW |
1610 | struct hlist_node *node; |
1611 | struct hlist_head *head; | |
1612 | uint32_t i; | |
1613 | bool is_own; | |
1eda58bf | 1614 | uint8_t *primary_addr; |
9bf8e4d4 | 1615 | |
30da63a6 ML |
1616 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1617 | if (!primary_if) | |
9bf8e4d4 | 1618 | goto out; |
9bf8e4d4 | 1619 | |
1eda58bf | 1620 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1621 | seq_printf(seq, |
39a32991 | 1622 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1623 | net_dev->name, primary_addr, |
807736f6 | 1624 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1625 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1626 | "Client", "VID", "Originator", "CRC"); |
1627 | for (i = 0; i < hash->size; i++) { | |
1628 | head = &hash->table[i]; | |
1629 | ||
1630 | rcu_read_lock(); | |
1631 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1632 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1633 | primary_addr); | |
39a32991 | 1634 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%#.4x)\n", |
9bf8e4d4 SW |
1635 | claim->addr, claim->vid, |
1636 | claim->backbone_gw->orig, | |
1637 | (is_own ? 'x' : ' '), | |
1638 | claim->backbone_gw->crc); | |
1639 | } | |
1640 | rcu_read_unlock(); | |
1641 | } | |
1642 | out: | |
1643 | if (primary_if) | |
e5d89254 | 1644 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1645 | return 0; |
9bf8e4d4 | 1646 | } |
536a23f1 SW |
1647 | |
1648 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1649 | { | |
1650 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1651 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1652 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1653 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 SW |
1654 | struct batadv_hard_iface *primary_if; |
1655 | struct hlist_node *node; | |
1656 | struct hlist_head *head; | |
1657 | int secs, msecs; | |
1658 | uint32_t i; | |
1659 | bool is_own; | |
536a23f1 SW |
1660 | uint8_t *primary_addr; |
1661 | ||
30da63a6 ML |
1662 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1663 | if (!primary_if) | |
536a23f1 | 1664 | goto out; |
536a23f1 SW |
1665 | |
1666 | primary_addr = primary_if->net_dev->dev_addr; | |
1667 | seq_printf(seq, | |
39a32991 | 1668 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1669 | net_dev->name, primary_addr, |
807736f6 | 1670 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1671 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1672 | "Originator", "VID", "last seen", "CRC"); |
1673 | for (i = 0; i < hash->size; i++) { | |
1674 | head = &hash->table[i]; | |
1675 | ||
1676 | rcu_read_lock(); | |
1677 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1678 | msecs = jiffies_to_msecs(jiffies - | |
1679 | backbone_gw->lasttime); | |
1680 | secs = msecs / 1000; | |
1681 | msecs = msecs % 1000; | |
1682 | ||
1683 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1684 | primary_addr); | |
1685 | if (is_own) | |
1686 | continue; | |
1687 | ||
1688 | seq_printf(seq, | |
39a32991 | 1689 | " * %pM on % 5d % 4i.%03is (%#.4x)\n", |
536a23f1 SW |
1690 | backbone_gw->orig, backbone_gw->vid, |
1691 | secs, msecs, backbone_gw->crc); | |
1692 | } | |
1693 | rcu_read_unlock(); | |
1694 | } | |
1695 | out: | |
1696 | if (primary_if) | |
1697 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1698 | return 0; |
536a23f1 | 1699 | } |