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9cfc7bd6 | 1 | /* Copyright (C) 2011-2012 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); |
56303d34 SE |
37 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
38 | struct batadv_backbone_gw *backbone_gw); | |
23721387 SW |
39 | |
40 | /* return the index of the claim */ | |
3b300de3 | 41 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
23721387 SW |
42 | { |
43 | const unsigned char *key = data; | |
44 | uint32_t hash = 0; | |
45 | size_t i; | |
46 | ||
47 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
48 | hash += key[i]; | |
49 | hash += (hash << 10); | |
50 | hash ^= (hash >> 6); | |
51 | } | |
52 | ||
53 | hash += (hash << 3); | |
54 | hash ^= (hash >> 11); | |
55 | hash += (hash << 15); | |
56 | ||
57 | return hash % size; | |
58 | } | |
59 | ||
60 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
61 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
62 | uint32_t size) | |
23721387 SW |
63 | { |
64 | const unsigned char *key = data; | |
65 | uint32_t hash = 0; | |
66 | size_t i; | |
67 | ||
68 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
69 | hash += key[i]; | |
70 | hash += (hash << 10); | |
71 | hash ^= (hash >> 6); | |
72 | } | |
73 | ||
74 | hash += (hash << 3); | |
75 | hash ^= (hash >> 11); | |
76 | hash += (hash << 15); | |
77 | ||
78 | return hash % size; | |
79 | } | |
80 | ||
81 | ||
82 | /* compares address and vid of two backbone gws */ | |
3b300de3 SE |
83 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
84 | const void *data2) | |
23721387 | 85 | { |
56303d34 | 86 | const void *data1 = container_of(node, struct batadv_backbone_gw, |
23721387 SW |
87 | hash_entry); |
88 | ||
89 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
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 | { |
56303d34 | 96 | const void *data1 = container_of(node, struct batadv_claim, |
23721387 SW |
97 | hash_entry); |
98 | ||
99 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
100 | } | |
101 | ||
102 | /* free a backbone gw */ | |
56303d34 | 103 | static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
104 | { |
105 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
106 | kfree_rcu(backbone_gw, rcu); | |
107 | } | |
108 | ||
109 | /* finally deinitialize the claim */ | |
3b300de3 | 110 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 111 | { |
56303d34 | 112 | struct batadv_claim *claim; |
23721387 | 113 | |
56303d34 | 114 | claim = container_of(rcu, struct batadv_claim, rcu); |
23721387 | 115 | |
3b300de3 | 116 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
117 | kfree(claim); |
118 | } | |
119 | ||
120 | /* free a claim, call claim_free_rcu if its the last reference */ | |
56303d34 | 121 | static void batadv_claim_free_ref(struct batadv_claim *claim) |
23721387 SW |
122 | { |
123 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 124 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
125 | } |
126 | ||
9cfc7bd6 | 127 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
128 | * @data: search data (may be local/static data) |
129 | * | |
130 | * looks for a claim in the hash, and returns it if found | |
131 | * or NULL otherwise. | |
132 | */ | |
56303d34 SE |
133 | static struct batadv_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv, |
134 | struct batadv_claim *data) | |
23721387 | 135 | { |
5bf74e9c | 136 | struct batadv_hashtable *hash = bat_priv->claim_hash; |
23721387 SW |
137 | struct hlist_head *head; |
138 | struct hlist_node *node; | |
56303d34 SE |
139 | struct batadv_claim *claim; |
140 | struct batadv_claim *claim_tmp = NULL; | |
23721387 SW |
141 | int index; |
142 | ||
143 | if (!hash) | |
144 | return NULL; | |
145 | ||
3b300de3 | 146 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
147 | head = &hash->table[index]; |
148 | ||
149 | rcu_read_lock(); | |
150 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
3b300de3 | 151 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
152 | continue; |
153 | ||
154 | if (!atomic_inc_not_zero(&claim->refcount)) | |
155 | continue; | |
156 | ||
157 | claim_tmp = claim; | |
158 | break; | |
159 | } | |
160 | rcu_read_unlock(); | |
161 | ||
162 | return claim_tmp; | |
163 | } | |
164 | ||
2c53040f BH |
165 | /** |
166 | * batadv_backbone_hash_find - looks for a claim in the hash | |
167 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
168 | * @addr: the address of the originator |
169 | * @vid: the VLAN ID | |
170 | * | |
2c53040f | 171 | * Returns claim if found or NULL otherwise. |
23721387 | 172 | */ |
56303d34 SE |
173 | static struct batadv_backbone_gw * |
174 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, | |
175 | uint8_t *addr, short vid) | |
23721387 | 176 | { |
5bf74e9c | 177 | struct batadv_hashtable *hash = bat_priv->backbone_hash; |
23721387 SW |
178 | struct hlist_head *head; |
179 | struct hlist_node *node; | |
56303d34 SE |
180 | struct batadv_backbone_gw search_entry, *backbone_gw; |
181 | struct batadv_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
182 | int index; |
183 | ||
184 | if (!hash) | |
185 | return NULL; | |
186 | ||
187 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
188 | search_entry.vid = vid; | |
189 | ||
3b300de3 | 190 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
191 | head = &hash->table[index]; |
192 | ||
193 | rcu_read_lock(); | |
194 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
3b300de3 SE |
195 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
196 | &search_entry)) | |
23721387 SW |
197 | continue; |
198 | ||
199 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
200 | continue; | |
201 | ||
202 | backbone_gw_tmp = backbone_gw; | |
203 | break; | |
204 | } | |
205 | rcu_read_unlock(); | |
206 | ||
207 | return backbone_gw_tmp; | |
208 | } | |
209 | ||
210 | /* delete all claims for a backbone */ | |
56303d34 SE |
211 | static void |
212 | batadv_bla_del_backbone_claims(struct batadv_backbone_gw *backbone_gw) | |
23721387 | 213 | { |
5bf74e9c | 214 | struct batadv_hashtable *hash; |
23721387 SW |
215 | struct hlist_node *node, *node_tmp; |
216 | struct hlist_head *head; | |
56303d34 | 217 | struct batadv_claim *claim; |
23721387 SW |
218 | int i; |
219 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
220 | ||
221 | hash = backbone_gw->bat_priv->claim_hash; | |
222 | if (!hash) | |
223 | return; | |
224 | ||
225 | for (i = 0; i < hash->size; i++) { | |
226 | head = &hash->table[i]; | |
227 | list_lock = &hash->list_locks[i]; | |
228 | ||
229 | spin_lock_bh(list_lock); | |
230 | hlist_for_each_entry_safe(claim, node, node_tmp, | |
231 | head, hash_entry) { | |
232 | ||
233 | if (claim->backbone_gw != backbone_gw) | |
234 | continue; | |
235 | ||
3b300de3 | 236 | batadv_claim_free_ref(claim); |
23721387 SW |
237 | hlist_del_rcu(node); |
238 | } | |
239 | spin_unlock_bh(list_lock); | |
240 | } | |
241 | ||
242 | /* all claims gone, intialize CRC */ | |
3964f728 | 243 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
244 | } |
245 | ||
2c53040f BH |
246 | /** |
247 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
248 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
249 | * @orig: the mac address to be announced within the claim |
250 | * @vid: the VLAN ID | |
251 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 252 | */ |
56303d34 | 253 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
3b300de3 | 254 | short vid, int claimtype) |
23721387 SW |
255 | { |
256 | struct sk_buff *skb; | |
257 | struct ethhdr *ethhdr; | |
56303d34 | 258 | struct batadv_hard_iface *primary_if; |
23721387 SW |
259 | struct net_device *soft_iface; |
260 | uint8_t *hw_src; | |
96412690 | 261 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 262 | __be32 zeroip = 0; |
23721387 | 263 | |
e5d89254 | 264 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
265 | if (!primary_if) |
266 | return; | |
267 | ||
38ef3d1d SW |
268 | memcpy(&local_claim_dest, &bat_priv->claim_dest, |
269 | sizeof(local_claim_dest)); | |
23721387 SW |
270 | local_claim_dest.type = claimtype; |
271 | ||
272 | soft_iface = primary_if->soft_iface; | |
273 | ||
274 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
275 | /* IP DST: 0.0.0.0 */ | |
276 | zeroip, | |
277 | primary_if->soft_iface, | |
278 | /* IP SRC: 0.0.0.0 */ | |
279 | zeroip, | |
280 | /* Ethernet DST: Broadcast */ | |
281 | NULL, | |
282 | /* Ethernet SRC/HW SRC: originator mac */ | |
283 | primary_if->net_dev->dev_addr, | |
284 | /* HW DST: FF:43:05:XX:00:00 | |
285 | * with XX = claim type | |
38ef3d1d | 286 | * and YY:YY = group id |
23721387 SW |
287 | */ |
288 | (uint8_t *)&local_claim_dest); | |
289 | ||
290 | if (!skb) | |
291 | goto out; | |
292 | ||
293 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 294 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
295 | |
296 | /* now we pretend that the client would have sent this ... */ | |
297 | switch (claimtype) { | |
acd34afa | 298 | case BATADV_CLAIM_TYPE_ADD: |
23721387 SW |
299 | /* normal claim frame |
300 | * set Ethernet SRC to the clients mac | |
301 | */ | |
302 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
39c75a51 | 303 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 304 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); |
23721387 | 305 | break; |
acd34afa | 306 | case BATADV_CLAIM_TYPE_DEL: |
23721387 SW |
307 | /* unclaim frame |
308 | * set HW SRC to the clients mac | |
309 | */ | |
310 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 311 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
312 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
313 | vid); | |
23721387 | 314 | break; |
acd34afa | 315 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
316 | /* announcement frame |
317 | * set HW SRC to the special mac containg the crc | |
318 | */ | |
319 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 320 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
321 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
322 | ethhdr->h_source, vid); | |
23721387 | 323 | break; |
acd34afa | 324 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 SW |
325 | /* request frame |
326 | * set HW SRC to the special mac containg the crc | |
327 | */ | |
328 | memcpy(hw_src, mac, ETH_ALEN); | |
329 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 330 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
331 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", |
332 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 SW |
333 | break; |
334 | ||
335 | } | |
336 | ||
337 | if (vid != -1) | |
338 | skb = vlan_insert_tag(skb, vid); | |
339 | ||
340 | skb_reset_mac_header(skb); | |
341 | skb->protocol = eth_type_trans(skb, soft_iface); | |
342 | bat_priv->stats.rx_packets++; | |
0d125074 | 343 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN; |
23721387 SW |
344 | soft_iface->last_rx = jiffies; |
345 | ||
346 | netif_rx(skb); | |
347 | out: | |
348 | if (primary_if) | |
e5d89254 | 349 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
350 | } |
351 | ||
2c53040f BH |
352 | /** |
353 | * batadv_bla_get_backbone_gw | |
354 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
355 | * @orig: the mac address of the originator |
356 | * @vid: the VLAN ID | |
357 | * | |
358 | * searches for the backbone gw or creates a new one if it could not | |
359 | * be found. | |
360 | */ | |
56303d34 SE |
361 | static struct batadv_backbone_gw * |
362 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, | |
363 | short vid) | |
23721387 | 364 | { |
56303d34 SE |
365 | struct batadv_backbone_gw *entry; |
366 | struct batadv_orig_node *orig_node; | |
23721387 SW |
367 | int hash_added; |
368 | ||
3b300de3 | 369 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
370 | |
371 | if (entry) | |
372 | return entry; | |
373 | ||
39c75a51 | 374 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
375 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
376 | orig, vid); | |
23721387 SW |
377 | |
378 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
379 | if (!entry) | |
380 | return NULL; | |
381 | ||
382 | entry->vid = vid; | |
383 | entry->lasttime = jiffies; | |
3964f728 | 384 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
385 | entry->bat_priv = bat_priv; |
386 | atomic_set(&entry->request_sent, 0); | |
387 | memcpy(entry->orig, orig, ETH_ALEN); | |
388 | ||
389 | /* one for the hash, one for returning */ | |
390 | atomic_set(&entry->refcount, 2); | |
391 | ||
c0a55929 | 392 | hash_added = batadv_hash_add(bat_priv->backbone_hash, |
3b300de3 SE |
393 | batadv_compare_backbone_gw, |
394 | batadv_choose_backbone_gw, entry, | |
395 | &entry->hash_entry); | |
23721387 SW |
396 | |
397 | if (unlikely(hash_added != 0)) { | |
398 | /* hash failed, free the structure */ | |
399 | kfree(entry); | |
400 | return NULL; | |
401 | } | |
402 | ||
20ff9d59 | 403 | /* this is a gateway now, remove any tt entries */ |
da641193 | 404 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 405 | if (orig_node) { |
08c36d3e SE |
406 | batadv_tt_global_del_orig(bat_priv, orig_node, |
407 | "became a backbone gateway"); | |
7d211efc | 408 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 409 | } |
23721387 SW |
410 | return entry; |
411 | } | |
412 | ||
413 | /* update or add the own backbone gw to make sure we announce | |
414 | * where we receive other backbone gws | |
415 | */ | |
56303d34 SE |
416 | static void |
417 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
418 | struct batadv_hard_iface *primary_if, | |
419 | short vid) | |
23721387 | 420 | { |
56303d34 | 421 | struct batadv_backbone_gw *backbone_gw; |
23721387 | 422 | |
3b300de3 SE |
423 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
424 | primary_if->net_dev->dev_addr, | |
425 | vid); | |
23721387 SW |
426 | if (unlikely(!backbone_gw)) |
427 | return; | |
428 | ||
429 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 430 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
431 | } |
432 | ||
9cfc7bd6 | 433 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
434 | * @vid: the vid where the request came on |
435 | * | |
436 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
437 | * to allow the requester another check if the CRC is correct now. | |
438 | */ | |
56303d34 SE |
439 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
440 | struct batadv_hard_iface *primary_if, | |
441 | short vid) | |
23721387 SW |
442 | { |
443 | struct hlist_node *node; | |
444 | struct hlist_head *head; | |
5bf74e9c | 445 | struct batadv_hashtable *hash; |
56303d34 SE |
446 | struct batadv_claim *claim; |
447 | struct batadv_backbone_gw *backbone_gw; | |
23721387 SW |
448 | int i; |
449 | ||
39c75a51 | 450 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 451 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 452 | |
3b300de3 SE |
453 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
454 | primary_if->net_dev->dev_addr, | |
455 | vid); | |
23721387 SW |
456 | if (!backbone_gw) |
457 | return; | |
458 | ||
459 | hash = bat_priv->claim_hash; | |
460 | for (i = 0; i < hash->size; i++) { | |
461 | head = &hash->table[i]; | |
462 | ||
463 | rcu_read_lock(); | |
464 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
465 | /* only own claims are interesting */ | |
466 | if (claim->backbone_gw != backbone_gw) | |
467 | continue; | |
468 | ||
3b300de3 | 469 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
acd34afa | 470 | BATADV_CLAIM_TYPE_ADD); |
23721387 SW |
471 | } |
472 | rcu_read_unlock(); | |
473 | } | |
474 | ||
475 | /* finally, send an announcement frame */ | |
3b300de3 SE |
476 | batadv_bla_send_announce(bat_priv, backbone_gw); |
477 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
478 | } |
479 | ||
9cfc7bd6 | 480 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
481 | * |
482 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
483 | * After the request, it will repeat all of his own claims and finally | |
484 | * send an announcement claim with which we can check again. | |
485 | */ | |
56303d34 | 486 | static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
487 | { |
488 | /* first, remove all old entries */ | |
3b300de3 | 489 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 490 | |
39c75a51 SE |
491 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
492 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
493 | |
494 | /* send request */ | |
3b300de3 | 495 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 496 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
497 | |
498 | /* no local broadcasts should be sent or received, for now. */ | |
499 | if (!atomic_read(&backbone_gw->request_sent)) { | |
500 | atomic_inc(&backbone_gw->bat_priv->bla_num_requests); | |
501 | atomic_set(&backbone_gw->request_sent, 1); | |
502 | } | |
503 | } | |
504 | ||
9cfc7bd6 | 505 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
506 | * @backbone_gw: our backbone gateway which should be announced |
507 | * | |
508 | * This function sends an announcement. It is called from multiple | |
509 | * places. | |
510 | */ | |
56303d34 SE |
511 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
512 | struct batadv_backbone_gw *backbone_gw) | |
23721387 SW |
513 | { |
514 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 515 | __be16 crc; |
23721387 | 516 | |
3b300de3 | 517 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 518 | crc = htons(backbone_gw->crc); |
1a5852d8 | 519 | memcpy(&mac[4], &crc, 2); |
23721387 | 520 | |
3b300de3 | 521 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 522 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
523 | |
524 | } | |
525 | ||
2c53040f BH |
526 | /** |
527 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
528 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
529 | * @mac: the mac address of the claim |
530 | * @vid: the VLAN ID of the frame | |
531 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 532 | */ |
56303d34 SE |
533 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
534 | const uint8_t *mac, const short vid, | |
535 | struct batadv_backbone_gw *backbone_gw) | |
23721387 | 536 | { |
56303d34 SE |
537 | struct batadv_claim *claim; |
538 | struct batadv_claim search_claim; | |
23721387 SW |
539 | int hash_added; |
540 | ||
541 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
542 | search_claim.vid = vid; | |
3b300de3 | 543 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
544 | |
545 | /* create a new claim entry if it does not exist yet. */ | |
546 | if (!claim) { | |
547 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
548 | if (!claim) | |
549 | return; | |
550 | ||
551 | memcpy(claim->addr, mac, ETH_ALEN); | |
552 | claim->vid = vid; | |
553 | claim->lasttime = jiffies; | |
554 | claim->backbone_gw = backbone_gw; | |
555 | ||
556 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 557 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
558 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
559 | mac, vid); | |
c0a55929 | 560 | hash_added = batadv_hash_add(bat_priv->claim_hash, |
3b300de3 SE |
561 | batadv_compare_claim, |
562 | batadv_choose_claim, claim, | |
563 | &claim->hash_entry); | |
23721387 SW |
564 | |
565 | if (unlikely(hash_added != 0)) { | |
566 | /* only local changes happened. */ | |
567 | kfree(claim); | |
568 | return; | |
569 | } | |
570 | } else { | |
571 | claim->lasttime = jiffies; | |
572 | if (claim->backbone_gw == backbone_gw) | |
573 | /* no need to register a new backbone */ | |
574 | goto claim_free_ref; | |
575 | ||
39c75a51 | 576 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
577 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
578 | mac, vid); | |
23721387 SW |
579 | |
580 | claim->backbone_gw->crc ^= | |
581 | crc16(0, claim->addr, ETH_ALEN); | |
3b300de3 | 582 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
583 | |
584 | } | |
585 | /* set (new) backbone gw */ | |
586 | atomic_inc(&backbone_gw->refcount); | |
587 | claim->backbone_gw = backbone_gw; | |
588 | ||
589 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
590 | backbone_gw->lasttime = jiffies; | |
591 | ||
592 | claim_free_ref: | |
3b300de3 | 593 | batadv_claim_free_ref(claim); |
23721387 SW |
594 | } |
595 | ||
596 | /* Delete a claim from the claim hash which has the | |
597 | * given mac address and vid. | |
598 | */ | |
56303d34 SE |
599 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
600 | const uint8_t *mac, const short vid) | |
23721387 | 601 | { |
56303d34 | 602 | struct batadv_claim search_claim, *claim; |
23721387 SW |
603 | |
604 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
605 | search_claim.vid = vid; | |
3b300de3 | 606 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
607 | if (!claim) |
608 | return; | |
609 | ||
39c75a51 SE |
610 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
611 | mac, vid); | |
23721387 | 612 | |
3b300de3 SE |
613 | batadv_hash_remove(bat_priv->claim_hash, batadv_compare_claim, |
614 | batadv_choose_claim, claim); | |
615 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
616 | |
617 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
618 | ||
619 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 620 | batadv_claim_free_ref(claim); |
23721387 SW |
621 | } |
622 | ||
623 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 624 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
625 | uint8_t *an_addr, uint8_t *backbone_addr, |
626 | short vid) | |
23721387 | 627 | { |
56303d34 | 628 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
629 | uint16_t crc; |
630 | ||
3b300de3 | 631 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
632 | return 0; |
633 | ||
3b300de3 | 634 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
635 | |
636 | if (unlikely(!backbone_gw)) | |
637 | return 1; | |
638 | ||
639 | ||
640 | /* handle as ANNOUNCE frame */ | |
641 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 642 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 643 | |
39c75a51 | 644 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
645 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", |
646 | vid, backbone_gw->orig, crc); | |
23721387 SW |
647 | |
648 | if (backbone_gw->crc != crc) { | |
39c75a51 | 649 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
650 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", |
651 | backbone_gw->orig, backbone_gw->vid, | |
652 | backbone_gw->crc, crc); | |
23721387 | 653 | |
3b300de3 | 654 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
655 | } else { |
656 | /* if we have sent a request and the crc was OK, | |
657 | * we can allow traffic again. | |
658 | */ | |
659 | if (atomic_read(&backbone_gw->request_sent)) { | |
660 | atomic_dec(&backbone_gw->bat_priv->bla_num_requests); | |
661 | atomic_set(&backbone_gw->request_sent, 0); | |
662 | } | |
663 | } | |
664 | ||
3b300de3 | 665 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
666 | return 1; |
667 | } | |
668 | ||
669 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
670 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
671 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
672 | uint8_t *backbone_addr, |
673 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
674 | { |
675 | /* check for REQUEST frame */ | |
1eda58bf | 676 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
677 | return 0; |
678 | ||
679 | /* sanity check, this should not happen on a normal switch, | |
680 | * we ignore it in this case. | |
681 | */ | |
1eda58bf | 682 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
683 | return 1; |
684 | ||
39c75a51 | 685 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
686 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
687 | vid, ethhdr->h_source); | |
23721387 | 688 | |
3b300de3 | 689 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
690 | return 1; |
691 | } | |
692 | ||
693 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
694 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
695 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
696 | uint8_t *backbone_addr, |
697 | uint8_t *claim_addr, short vid) | |
23721387 | 698 | { |
56303d34 | 699 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
700 | |
701 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
702 | if (primary_if && batadv_compare_eth(backbone_addr, |
703 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 704 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
acd34afa | 705 | BATADV_CLAIM_TYPE_DEL); |
23721387 | 706 | |
3b300de3 | 707 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
708 | |
709 | if (!backbone_gw) | |
710 | return 1; | |
711 | ||
712 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 713 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
714 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
715 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 716 | |
3b300de3 SE |
717 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
718 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
719 | return 1; |
720 | } | |
721 | ||
722 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
723 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
724 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
725 | uint8_t *backbone_addr, uint8_t *claim_addr, |
726 | short vid) | |
23721387 | 727 | { |
56303d34 | 728 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
729 | |
730 | /* register the gateway if not yet available, and add the claim. */ | |
731 | ||
3b300de3 | 732 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
733 | |
734 | if (unlikely(!backbone_gw)) | |
735 | return 1; | |
736 | ||
737 | /* this must be a CLAIM frame */ | |
3b300de3 | 738 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 739 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 740 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
acd34afa | 741 | BATADV_CLAIM_TYPE_ADD); |
23721387 SW |
742 | |
743 | /* TODO: we could call something like tt_local_del() here. */ | |
744 | ||
3b300de3 | 745 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
746 | return 1; |
747 | } | |
748 | ||
2c53040f BH |
749 | /** |
750 | * batadv_check_claim_group | |
751 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
752 | * @hw_src: the Hardware source in the ARP Header |
753 | * @hw_dst: the Hardware destination in the ARP Header | |
754 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
755 | * | |
756 | * checks if it is a claim packet and if its on the same group. | |
757 | * This function also applies the group ID of the sender | |
758 | * if it is in the same mesh. | |
759 | * | |
760 | * returns: | |
761 | * 2 - if it is a claim packet and on the same group | |
762 | * 1 - if is a claim packet from another group | |
763 | * 0 - if it is not a claim packet | |
764 | */ | |
56303d34 SE |
765 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
766 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
767 | uint8_t *hw_src, uint8_t *hw_dst, |
768 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
769 | { |
770 | uint8_t *backbone_addr; | |
56303d34 | 771 | struct batadv_orig_node *orig_node; |
96412690 | 772 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 773 | |
96412690 | 774 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
38ef3d1d SW |
775 | bla_dst_own = &bat_priv->claim_dest; |
776 | ||
777 | /* check if it is a claim packet in general */ | |
778 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
779 | sizeof(bla_dst->magic)) != 0) | |
780 | return 0; | |
781 | ||
782 | /* if announcement packet, use the source, | |
783 | * otherwise assume it is in the hw_src | |
784 | */ | |
785 | switch (bla_dst->type) { | |
acd34afa | 786 | case BATADV_CLAIM_TYPE_ADD: |
38ef3d1d SW |
787 | backbone_addr = hw_src; |
788 | break; | |
acd34afa SE |
789 | case BATADV_CLAIM_TYPE_REQUEST: |
790 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
791 | case BATADV_CLAIM_TYPE_DEL: | |
38ef3d1d SW |
792 | backbone_addr = ethhdr->h_source; |
793 | break; | |
794 | default: | |
795 | return 0; | |
796 | } | |
797 | ||
798 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 799 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
800 | return 0; |
801 | ||
802 | /* if its already the same group, it is fine. */ | |
803 | if (bla_dst->group == bla_dst_own->group) | |
804 | return 2; | |
805 | ||
806 | /* lets see if this originator is in our mesh */ | |
da641193 | 807 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
808 | |
809 | /* dont accept claims from gateways which are not in | |
810 | * the same mesh or group. | |
811 | */ | |
812 | if (!orig_node) | |
813 | return 1; | |
814 | ||
815 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
816 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 817 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
818 | "taking other backbones claim group: %04x\n", |
819 | ntohs(bla_dst->group)); | |
38ef3d1d SW |
820 | bla_dst_own->group = bla_dst->group; |
821 | } | |
822 | ||
7d211efc | 823 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
824 | |
825 | return 2; | |
826 | } | |
827 | ||
828 | ||
9cfc7bd6 | 829 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
830 | * @skb: the frame to be checked |
831 | * | |
832 | * Check if this is a claim frame, and process it accordingly. | |
833 | * | |
834 | * returns 1 if it was a claim frame, otherwise return 0 to | |
835 | * tell the callee that it can use the frame on its own. | |
836 | */ | |
56303d34 SE |
837 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
838 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 839 | struct sk_buff *skb) |
23721387 SW |
840 | { |
841 | struct ethhdr *ethhdr; | |
842 | struct vlan_ethhdr *vhdr; | |
843 | struct arphdr *arphdr; | |
844 | uint8_t *hw_src, *hw_dst; | |
96412690 | 845 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
846 | uint16_t proto; |
847 | int headlen; | |
848 | short vid = -1; | |
38ef3d1d | 849 | int ret; |
23721387 SW |
850 | |
851 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
852 | ||
853 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
854 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
855 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
856 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
857 | headlen = sizeof(*vhdr); | |
858 | } else { | |
859 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 860 | headlen = ETH_HLEN; |
23721387 SW |
861 | } |
862 | ||
863 | if (proto != ETH_P_ARP) | |
864 | return 0; /* not a claim frame */ | |
865 | ||
866 | /* this must be a ARP frame. check if it is a claim. */ | |
867 | ||
868 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
869 | return 0; | |
870 | ||
871 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
872 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
873 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
874 | ||
875 | /* Check whether the ARP frame carries a valid | |
876 | * IP information | |
877 | */ | |
23721387 SW |
878 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
879 | return 0; | |
880 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
881 | return 0; | |
882 | if (arphdr->ar_hln != ETH_ALEN) | |
883 | return 0; | |
884 | if (arphdr->ar_pln != 4) | |
885 | return 0; | |
886 | ||
887 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
888 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 889 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
890 | |
891 | /* check if it is a claim frame. */ | |
3b300de3 SE |
892 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
893 | ethhdr); | |
38ef3d1d | 894 | if (ret == 1) |
39c75a51 | 895 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
896 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
897 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
898 | |
899 | if (ret < 2) | |
900 | return ret; | |
23721387 SW |
901 | |
902 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 903 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
904 | |
905 | /* check for the different types of claim frames ... */ | |
906 | switch (bla_dst->type) { | |
acd34afa | 907 | case BATADV_CLAIM_TYPE_ADD: |
3b300de3 SE |
908 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
909 | ethhdr->h_source, vid)) | |
23721387 SW |
910 | return 1; |
911 | break; | |
acd34afa | 912 | case BATADV_CLAIM_TYPE_DEL: |
3b300de3 SE |
913 | if (batadv_handle_unclaim(bat_priv, primary_if, |
914 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
915 | return 1; |
916 | break; | |
917 | ||
acd34afa | 918 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
919 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
920 | vid)) | |
23721387 SW |
921 | return 1; |
922 | break; | |
acd34afa | 923 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
924 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
925 | vid)) | |
23721387 SW |
926 | return 1; |
927 | break; | |
928 | } | |
929 | ||
39c75a51 | 930 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
931 | "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", |
932 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
933 | return 1; |
934 | } | |
935 | ||
936 | /* Check when we last heard from other nodes, and remove them in case of | |
937 | * a time out, or clean all backbone gws if now is set. | |
938 | */ | |
56303d34 | 939 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 940 | { |
56303d34 | 941 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
942 | struct hlist_node *node, *node_tmp; |
943 | struct hlist_head *head; | |
5bf74e9c | 944 | struct batadv_hashtable *hash; |
23721387 SW |
945 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
946 | int i; | |
947 | ||
948 | hash = bat_priv->backbone_hash; | |
949 | if (!hash) | |
950 | return; | |
951 | ||
952 | for (i = 0; i < hash->size; i++) { | |
953 | head = &hash->table[i]; | |
954 | list_lock = &hash->list_locks[i]; | |
955 | ||
956 | spin_lock_bh(list_lock); | |
957 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
958 | head, hash_entry) { | |
959 | if (now) | |
960 | goto purge_now; | |
1eda58bf | 961 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 962 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
963 | continue; |
964 | ||
39c75a51 | 965 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
966 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
967 | backbone_gw->orig); | |
23721387 SW |
968 | |
969 | purge_now: | |
970 | /* don't wait for the pending request anymore */ | |
971 | if (atomic_read(&backbone_gw->request_sent)) | |
972 | atomic_dec(&bat_priv->bla_num_requests); | |
973 | ||
3b300de3 | 974 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
975 | |
976 | hlist_del_rcu(node); | |
3b300de3 | 977 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
978 | } |
979 | spin_unlock_bh(list_lock); | |
980 | } | |
981 | } | |
982 | ||
2c53040f BH |
983 | /** |
984 | * batadv_bla_purge_claims | |
985 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
986 | * @primary_if: the selected primary interface, may be NULL if now is set |
987 | * @now: whether the whole hash shall be wiped now | |
988 | * | |
989 | * Check when we heard last time from our own claims, and remove them in case of | |
990 | * a time out, or clean all claims if now is set | |
991 | */ | |
56303d34 SE |
992 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
993 | struct batadv_hard_iface *primary_if, | |
994 | int now) | |
23721387 | 995 | { |
56303d34 | 996 | struct batadv_claim *claim; |
23721387 SW |
997 | struct hlist_node *node; |
998 | struct hlist_head *head; | |
5bf74e9c | 999 | struct batadv_hashtable *hash; |
23721387 SW |
1000 | int i; |
1001 | ||
1002 | hash = bat_priv->claim_hash; | |
1003 | if (!hash) | |
1004 | return; | |
1005 | ||
1006 | for (i = 0; i < hash->size; i++) { | |
1007 | head = &hash->table[i]; | |
1008 | ||
1009 | rcu_read_lock(); | |
1010 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1011 | if (now) | |
1012 | goto purge_now; | |
1eda58bf SE |
1013 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1014 | primary_if->net_dev->dev_addr)) | |
23721387 | 1015 | continue; |
1eda58bf | 1016 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1017 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1018 | continue; |
1019 | ||
39c75a51 | 1020 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1021 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1022 | claim->addr, claim->vid); | |
23721387 SW |
1023 | |
1024 | purge_now: | |
3b300de3 SE |
1025 | batadv_handle_unclaim(bat_priv, primary_if, |
1026 | claim->backbone_gw->orig, | |
1027 | claim->addr, claim->vid); | |
23721387 SW |
1028 | } |
1029 | rcu_read_unlock(); | |
1030 | } | |
1031 | } | |
1032 | ||
2c53040f BH |
1033 | /** |
1034 | * batadv_bla_update_orig_address | |
1035 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1036 | * @primary_if: the new selected primary_if |
1037 | * @oldif: the old primary interface, may be NULL | |
1038 | * | |
1039 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1040 | */ |
56303d34 SE |
1041 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1042 | struct batadv_hard_iface *primary_if, | |
1043 | struct batadv_hard_iface *oldif) | |
23721387 | 1044 | { |
56303d34 | 1045 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1046 | struct hlist_node *node; |
1047 | struct hlist_head *head; | |
5bf74e9c | 1048 | struct batadv_hashtable *hash; |
23721387 SW |
1049 | int i; |
1050 | ||
38ef3d1d SW |
1051 | /* reset bridge loop avoidance group id */ |
1052 | bat_priv->claim_dest.group = | |
1053 | htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); | |
1054 | ||
23721387 | 1055 | if (!oldif) { |
3b300de3 SE |
1056 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1057 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1058 | return; |
1059 | } | |
1060 | ||
1061 | hash = bat_priv->backbone_hash; | |
1062 | if (!hash) | |
1063 | return; | |
1064 | ||
1065 | for (i = 0; i < hash->size; i++) { | |
1066 | head = &hash->table[i]; | |
1067 | ||
1068 | rcu_read_lock(); | |
1069 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1070 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1071 | if (!batadv_compare_eth(backbone_gw->orig, |
1072 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1073 | continue; |
1074 | ||
1075 | memcpy(backbone_gw->orig, | |
1076 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1077 | /* send an announce frame so others will ask for our | |
1078 | * claims and update their tables. | |
1079 | */ | |
3b300de3 | 1080 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1081 | } |
1082 | rcu_read_unlock(); | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | ||
1087 | ||
1088 | /* (re)start the timer */ | |
56303d34 | 1089 | static void batadv_bla_start_timer(struct batadv_priv *bat_priv) |
23721387 | 1090 | { |
3b300de3 | 1091 | INIT_DELAYED_WORK(&bat_priv->bla_work, batadv_bla_periodic_work); |
3193e8fd | 1092 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work, |
42d0b044 | 1093 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
23721387 SW |
1094 | } |
1095 | ||
1096 | /* periodic work to do: | |
1097 | * * purge structures when they are too old | |
1098 | * * send announcements | |
1099 | */ | |
3b300de3 | 1100 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 SW |
1101 | { |
1102 | struct delayed_work *delayed_work = | |
1103 | container_of(work, struct delayed_work, work); | |
56303d34 | 1104 | struct batadv_priv *bat_priv; |
23721387 SW |
1105 | struct hlist_node *node; |
1106 | struct hlist_head *head; | |
56303d34 | 1107 | struct batadv_backbone_gw *backbone_gw; |
5bf74e9c | 1108 | struct batadv_hashtable *hash; |
56303d34 | 1109 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1110 | int i; |
1111 | ||
56303d34 | 1112 | bat_priv = container_of(delayed_work, struct batadv_priv, bla_work); |
e5d89254 | 1113 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1114 | if (!primary_if) |
1115 | goto out; | |
1116 | ||
3b300de3 SE |
1117 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1118 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1119 | |
1120 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1121 | goto out; | |
1122 | ||
1123 | hash = bat_priv->backbone_hash; | |
1124 | if (!hash) | |
1125 | goto out; | |
1126 | ||
1127 | for (i = 0; i < hash->size; i++) { | |
1128 | head = &hash->table[i]; | |
1129 | ||
1130 | rcu_read_lock(); | |
1131 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1132 | if (!batadv_compare_eth(backbone_gw->orig, |
1133 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1134 | continue; |
1135 | ||
1136 | backbone_gw->lasttime = jiffies; | |
1137 | ||
3b300de3 | 1138 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1139 | } |
1140 | rcu_read_unlock(); | |
1141 | } | |
1142 | out: | |
1143 | if (primary_if) | |
e5d89254 | 1144 | batadv_hardif_free_ref(primary_if); |
23721387 | 1145 | |
3b300de3 | 1146 | batadv_bla_start_timer(bat_priv); |
23721387 SW |
1147 | } |
1148 | ||
5d52dad2 SE |
1149 | /* The hash for claim and backbone hash receive the same key because they |
1150 | * are getting initialized by hash_new with the same key. Reinitializing | |
1151 | * them with to different keys to allow nested locking without generating | |
1152 | * lockdep warnings | |
1153 | */ | |
3b300de3 SE |
1154 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1155 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1156 | |
23721387 | 1157 | /* initialize all bla structures */ |
56303d34 | 1158 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1159 | { |
fe2da6ff | 1160 | int i; |
38ef3d1d | 1161 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1162 | struct batadv_hard_iface *primary_if; |
fe2da6ff | 1163 | |
39c75a51 | 1164 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1165 | |
38ef3d1d SW |
1166 | /* setting claim destination address */ |
1167 | memcpy(&bat_priv->claim_dest.magic, claim_dest, 3); | |
1168 | bat_priv->claim_dest.type = 0; | |
e5d89254 | 1169 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d SW |
1170 | if (primary_if) { |
1171 | bat_priv->claim_dest.group = | |
1172 | htons(crc16(0, primary_if->net_dev->dev_addr, | |
1173 | ETH_ALEN)); | |
e5d89254 | 1174 | batadv_hardif_free_ref(primary_if); |
38ef3d1d SW |
1175 | } else { |
1176 | bat_priv->claim_dest.group = 0; /* will be set later */ | |
1177 | } | |
1178 | ||
fe2da6ff | 1179 | /* initialize the duplicate list */ |
42d0b044 | 1180 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
fe2da6ff | 1181 | bat_priv->bcast_duplist[i].entrytime = |
42d0b044 | 1182 | jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
fe2da6ff SW |
1183 | bat_priv->bcast_duplist_curr = 0; |
1184 | ||
23721387 | 1185 | if (bat_priv->claim_hash) |
5346c35e | 1186 | return 0; |
23721387 | 1187 | |
1a8eaf07 SE |
1188 | bat_priv->claim_hash = batadv_hash_new(128); |
1189 | bat_priv->backbone_hash = batadv_hash_new(32); | |
23721387 SW |
1190 | |
1191 | if (!bat_priv->claim_hash || !bat_priv->backbone_hash) | |
5346c35e | 1192 | return -ENOMEM; |
23721387 | 1193 | |
5d52dad2 | 1194 | batadv_hash_set_lock_class(bat_priv->claim_hash, |
3b300de3 | 1195 | &batadv_claim_hash_lock_class_key); |
5d52dad2 | 1196 | batadv_hash_set_lock_class(bat_priv->backbone_hash, |
3b300de3 | 1197 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1198 | |
39c75a51 | 1199 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1200 | |
3b300de3 | 1201 | batadv_bla_start_timer(bat_priv); |
5346c35e | 1202 | return 0; |
23721387 SW |
1203 | } |
1204 | ||
2c53040f BH |
1205 | /** |
1206 | * batadv_bla_check_bcast_duplist | |
1207 | * @bat_priv: the bat priv with all the soft interface information | |
fe2da6ff SW |
1208 | * @bcast_packet: originator mac address |
1209 | * @hdr_size: maximum length of the frame | |
1210 | * | |
1211 | * check if it is on our broadcast list. Another gateway might | |
1212 | * have sent the same packet because it is connected to the same backbone, | |
1213 | * so we have to remove this duplicate. | |
1214 | * | |
1215 | * This is performed by checking the CRC, which will tell us | |
1216 | * with a good chance that it is the same packet. If it is furthermore | |
1217 | * sent by another host, drop it. We allow equal packets from | |
1218 | * the same host however as this might be intended. | |
9cfc7bd6 | 1219 | */ |
56303d34 | 1220 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
96412690 | 1221 | struct batadv_bcast_packet *bcast_packet, |
08adf151 | 1222 | int hdr_size) |
fe2da6ff SW |
1223 | { |
1224 | int i, length, curr; | |
1225 | uint8_t *content; | |
1226 | uint16_t crc; | |
56303d34 | 1227 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff SW |
1228 | |
1229 | length = hdr_size - sizeof(*bcast_packet); | |
1230 | content = (uint8_t *)bcast_packet; | |
1231 | content += sizeof(*bcast_packet); | |
1232 | ||
1233 | /* calculate the crc ... */ | |
1234 | crc = crc16(0, content, length); | |
1235 | ||
42d0b044 SE |
1236 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
1237 | curr = (bat_priv->bcast_duplist_curr + i) % BATADV_DUPLIST_SIZE; | |
fe2da6ff SW |
1238 | entry = &bat_priv->bcast_duplist[curr]; |
1239 | ||
1240 | /* we can stop searching if the entry is too old ; | |
1241 | * later entries will be even older | |
1242 | */ | |
42d0b044 SE |
1243 | if (batadv_has_timed_out(entry->entrytime, |
1244 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1245 | break; |
1246 | ||
1247 | if (entry->crc != crc) | |
1248 | continue; | |
1249 | ||
1eda58bf | 1250 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1251 | continue; |
1252 | ||
1253 | /* this entry seems to match: same crc, not too old, | |
1254 | * and from another gw. therefore return 1 to forbid it. | |
1255 | */ | |
1256 | return 1; | |
1257 | } | |
1258 | /* not found, add a new entry (overwrite the oldest entry) */ | |
42d0b044 SE |
1259 | curr = (bat_priv->bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
1260 | curr %= BATADV_DUPLIST_SIZE; | |
fe2da6ff SW |
1261 | entry = &bat_priv->bcast_duplist[curr]; |
1262 | entry->crc = crc; | |
1263 | entry->entrytime = jiffies; | |
1264 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
1265 | bat_priv->bcast_duplist_curr = curr; | |
1266 | ||
1267 | /* allow it, its the first occurence. */ | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | ||
1272 | ||
9cfc7bd6 | 1273 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1274 | * @orig: originator mac address |
1275 | * | |
1276 | * check if the originator is a gateway for any VLAN ID. | |
1277 | * | |
1278 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1279 | */ |
56303d34 | 1280 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1281 | { |
5bf74e9c | 1282 | struct batadv_hashtable *hash = bat_priv->backbone_hash; |
20ff9d59 SW |
1283 | struct hlist_head *head; |
1284 | struct hlist_node *node; | |
56303d34 | 1285 | struct batadv_backbone_gw *backbone_gw; |
20ff9d59 SW |
1286 | int i; |
1287 | ||
1288 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1289 | return 0; | |
1290 | ||
1291 | if (!hash) | |
1292 | return 0; | |
1293 | ||
1294 | for (i = 0; i < hash->size; i++) { | |
1295 | head = &hash->table[i]; | |
1296 | ||
1297 | rcu_read_lock(); | |
1298 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1299 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1300 | rcu_read_unlock(); |
1301 | return 1; | |
1302 | } | |
1303 | } | |
1304 | rcu_read_unlock(); | |
1305 | } | |
1306 | ||
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | ||
2c53040f BH |
1311 | /** |
1312 | * batadv_bla_is_backbone_gw | |
1313 | * @skb: the frame to be checked | |
23721387 SW |
1314 | * @orig_node: the orig_node of the frame |
1315 | * @hdr_size: maximum length of the frame | |
1316 | * | |
1317 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1318 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1319 | * returns 0. | |
23721387 | 1320 | */ |
08adf151 | 1321 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1322 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1323 | { |
1324 | struct ethhdr *ethhdr; | |
1325 | struct vlan_ethhdr *vhdr; | |
56303d34 | 1326 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1327 | short vid = -1; |
1328 | ||
1329 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1330 | return 0; | |
1331 | ||
1332 | /* first, find out the vid. */ | |
0d125074 | 1333 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1334 | return 0; |
1335 | ||
1336 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1337 | ||
1338 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1339 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1340 | return 0; | |
1341 | ||
1342 | vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) + | |
1343 | hdr_size); | |
1344 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1345 | } | |
1346 | ||
1347 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1348 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1349 | orig_node->orig, vid); | |
23721387 SW |
1350 | if (!backbone_gw) |
1351 | return 0; | |
1352 | ||
3b300de3 | 1353 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1354 | return 1; |
1355 | } | |
1356 | ||
1357 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1358 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1359 | { |
56303d34 | 1360 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1361 | |
1362 | cancel_delayed_work_sync(&bat_priv->bla_work); | |
e5d89254 | 1363 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1364 | |
1365 | if (bat_priv->claim_hash) { | |
3b300de3 | 1366 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
1a8eaf07 | 1367 | batadv_hash_destroy(bat_priv->claim_hash); |
23721387 SW |
1368 | bat_priv->claim_hash = NULL; |
1369 | } | |
1370 | if (bat_priv->backbone_hash) { | |
3b300de3 | 1371 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
1a8eaf07 | 1372 | batadv_hash_destroy(bat_priv->backbone_hash); |
23721387 SW |
1373 | bat_priv->backbone_hash = NULL; |
1374 | } | |
1375 | if (primary_if) | |
e5d89254 | 1376 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1377 | } |
1378 | ||
2c53040f BH |
1379 | /** |
1380 | * batadv_bla_rx | |
1381 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1382 | * @skb: the frame to be checked |
1383 | * @vid: the VLAN ID of the frame | |
1384 | * | |
1385 | * bla_rx avoidance checks if: | |
1386 | * * we have to race for a claim | |
1387 | * * if the frame is allowed on the LAN | |
1388 | * | |
1389 | * in these cases, the skb is further handled by this function and | |
1390 | * returns 1, otherwise it returns 0 and the caller shall further | |
1391 | * process the skb. | |
23721387 | 1392 | */ |
56303d34 | 1393 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1394 | { |
1395 | struct ethhdr *ethhdr; | |
56303d34 SE |
1396 | struct batadv_claim search_claim, *claim = NULL; |
1397 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1398 | int ret; |
1399 | ||
1400 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1401 | ||
e5d89254 | 1402 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1403 | if (!primary_if) |
1404 | goto handled; | |
1405 | ||
1406 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1407 | goto allow; | |
1408 | ||
1409 | ||
1410 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1411 | /* don't allow broadcasts while requests are in flight */ | |
1412 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1413 | goto handled; | |
1414 | ||
1415 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1416 | search_claim.vid = vid; | |
3b300de3 | 1417 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1418 | |
1419 | if (!claim) { | |
1420 | /* possible optimization: race for a claim */ | |
1421 | /* No claim exists yet, claim it for us! | |
1422 | */ | |
3b300de3 SE |
1423 | batadv_handle_claim(bat_priv, primary_if, |
1424 | primary_if->net_dev->dev_addr, | |
1425 | ethhdr->h_source, vid); | |
23721387 SW |
1426 | goto allow; |
1427 | } | |
1428 | ||
1429 | /* if it is our own claim ... */ | |
1eda58bf SE |
1430 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1431 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1432 | /* ... allow it in any case */ |
1433 | claim->lasttime = jiffies; | |
1434 | goto allow; | |
1435 | } | |
1436 | ||
1437 | /* if it is a broadcast ... */ | |
1438 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1439 | /* ... drop it. the responsible gateway is in charge. */ | |
1440 | goto handled; | |
1441 | } else { | |
1442 | /* seems the client considers us as its best gateway. | |
1443 | * send a claim and update the claim table | |
1444 | * immediately. | |
1445 | */ | |
3b300de3 SE |
1446 | batadv_handle_claim(bat_priv, primary_if, |
1447 | primary_if->net_dev->dev_addr, | |
1448 | ethhdr->h_source, vid); | |
23721387 SW |
1449 | goto allow; |
1450 | } | |
1451 | allow: | |
3b300de3 | 1452 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1453 | ret = 0; |
1454 | goto out; | |
1455 | ||
1456 | handled: | |
1457 | kfree_skb(skb); | |
1458 | ret = 1; | |
1459 | ||
1460 | out: | |
1461 | if (primary_if) | |
e5d89254 | 1462 | batadv_hardif_free_ref(primary_if); |
23721387 | 1463 | if (claim) |
3b300de3 | 1464 | batadv_claim_free_ref(claim); |
23721387 SW |
1465 | return ret; |
1466 | } | |
1467 | ||
2c53040f BH |
1468 | /** |
1469 | * batadv_bla_tx | |
1470 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1471 | * @skb: the frame to be checked |
1472 | * @vid: the VLAN ID of the frame | |
1473 | * | |
1474 | * bla_tx checks if: | |
1475 | * * a claim was received which has to be processed | |
1476 | * * the frame is allowed on the mesh | |
1477 | * | |
1478 | * in these cases, the skb is further handled by this function and | |
1479 | * returns 1, otherwise it returns 0 and the caller shall further | |
1480 | * process the skb. | |
23721387 | 1481 | */ |
56303d34 | 1482 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1483 | { |
1484 | struct ethhdr *ethhdr; | |
56303d34 SE |
1485 | struct batadv_claim search_claim, *claim = NULL; |
1486 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1487 | int ret = 0; |
1488 | ||
e5d89254 | 1489 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1490 | if (!primary_if) |
1491 | goto out; | |
1492 | ||
1493 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1494 | goto allow; | |
1495 | ||
1496 | /* in VLAN case, the mac header might not be set. */ | |
1497 | skb_reset_mac_header(skb); | |
1498 | ||
3b300de3 | 1499 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1500 | goto handled; |
1501 | ||
1502 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1503 | ||
1504 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1505 | /* don't allow broadcasts while requests are in flight */ | |
1506 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1507 | goto handled; | |
1508 | ||
1509 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1510 | search_claim.vid = vid; | |
1511 | ||
3b300de3 | 1512 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1513 | |
1514 | /* if no claim exists, allow it. */ | |
1515 | if (!claim) | |
1516 | goto allow; | |
1517 | ||
1518 | /* check if we are responsible. */ | |
1eda58bf SE |
1519 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1520 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1521 | /* if yes, the client has roamed and we have |
1522 | * to unclaim it. | |
1523 | */ | |
3b300de3 SE |
1524 | batadv_handle_unclaim(bat_priv, primary_if, |
1525 | primary_if->net_dev->dev_addr, | |
1526 | ethhdr->h_source, vid); | |
23721387 SW |
1527 | goto allow; |
1528 | } | |
1529 | ||
1530 | /* check if it is a multicast/broadcast frame */ | |
1531 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1532 | /* drop it. the responsible gateway has forwarded it into | |
1533 | * the backbone network. | |
1534 | */ | |
1535 | goto handled; | |
1536 | } else { | |
1537 | /* we must allow it. at least if we are | |
1538 | * responsible for the DESTINATION. | |
1539 | */ | |
1540 | goto allow; | |
1541 | } | |
1542 | allow: | |
3b300de3 | 1543 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1544 | ret = 0; |
1545 | goto out; | |
1546 | handled: | |
1547 | ret = 1; | |
1548 | out: | |
1549 | if (primary_if) | |
e5d89254 | 1550 | batadv_hardif_free_ref(primary_if); |
23721387 | 1551 | if (claim) |
3b300de3 | 1552 | batadv_claim_free_ref(claim); |
23721387 SW |
1553 | return ret; |
1554 | } | |
9bf8e4d4 | 1555 | |
08adf151 | 1556 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1557 | { |
1558 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1559 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
5bf74e9c | 1560 | struct batadv_hashtable *hash = bat_priv->claim_hash; |
56303d34 SE |
1561 | struct batadv_claim *claim; |
1562 | struct batadv_hard_iface *primary_if; | |
9bf8e4d4 SW |
1563 | struct hlist_node *node; |
1564 | struct hlist_head *head; | |
1565 | uint32_t i; | |
1566 | bool is_own; | |
1567 | int ret = 0; | |
1eda58bf | 1568 | uint8_t *primary_addr; |
9bf8e4d4 | 1569 | |
e5d89254 | 1570 | primary_if = batadv_primary_if_get_selected(bat_priv); |
9bf8e4d4 SW |
1571 | if (!primary_if) { |
1572 | ret = seq_printf(seq, | |
1573 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1574 | net_dev->name); | |
1575 | goto out; | |
1576 | } | |
1577 | ||
e9a4f295 | 1578 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
9bf8e4d4 SW |
1579 | ret = seq_printf(seq, |
1580 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1581 | net_dev->name); | |
1582 | goto out; | |
1583 | } | |
1584 | ||
1eda58bf | 1585 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d SW |
1586 | seq_printf(seq, |
1587 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1eda58bf | 1588 | net_dev->name, primary_addr, |
38ef3d1d | 1589 | ntohs(bat_priv->claim_dest.group)); |
9bf8e4d4 SW |
1590 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1591 | "Client", "VID", "Originator", "CRC"); | |
1592 | for (i = 0; i < hash->size; i++) { | |
1593 | head = &hash->table[i]; | |
1594 | ||
1595 | rcu_read_lock(); | |
1596 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1597 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1598 | primary_addr); | |
9bf8e4d4 SW |
1599 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", |
1600 | claim->addr, claim->vid, | |
1601 | claim->backbone_gw->orig, | |
1602 | (is_own ? 'x' : ' '), | |
1603 | claim->backbone_gw->crc); | |
1604 | } | |
1605 | rcu_read_unlock(); | |
1606 | } | |
1607 | out: | |
1608 | if (primary_if) | |
e5d89254 | 1609 | batadv_hardif_free_ref(primary_if); |
9bf8e4d4 SW |
1610 | return ret; |
1611 | } |