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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 | { |
807736f6 | 136 | struct batadv_hashtable *hash = bat_priv->bla.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 | { |
807736f6 | 177 | struct batadv_hashtable *hash = bat_priv->bla.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 | ||
807736f6 | 221 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
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 | ||
807736f6 | 268 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 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, | |
99e966fc | 284 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 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) { | |
3eb8773e | 298 | case BATADV_CLAIM_TYPE_CLAIM: |
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; |
3eb8773e | 306 | case BATADV_CLAIM_TYPE_UNCLAIM: |
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 | 325 | /* request frame |
99e966fc SW |
326 | * set HW SRC and header destination to the receiving backbone |
327 | * gws mac | |
23721387 SW |
328 | */ |
329 | memcpy(hw_src, mac, ETH_ALEN); | |
330 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 331 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
332 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", |
333 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 SW |
334 | break; |
335 | ||
336 | } | |
337 | ||
338 | if (vid != -1) | |
339 | skb = vlan_insert_tag(skb, vid); | |
340 | ||
341 | skb_reset_mac_header(skb); | |
342 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
343 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
344 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
345 | skb->len + ETH_HLEN); | |
23721387 SW |
346 | soft_iface->last_rx = jiffies; |
347 | ||
348 | netif_rx(skb); | |
349 | out: | |
350 | if (primary_if) | |
e5d89254 | 351 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
352 | } |
353 | ||
2c53040f BH |
354 | /** |
355 | * batadv_bla_get_backbone_gw | |
356 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
357 | * @orig: the mac address of the originator |
358 | * @vid: the VLAN ID | |
359 | * | |
360 | * searches for the backbone gw or creates a new one if it could not | |
361 | * be found. | |
362 | */ | |
56303d34 SE |
363 | static struct batadv_backbone_gw * |
364 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, | |
365 | short vid) | |
23721387 | 366 | { |
56303d34 SE |
367 | struct batadv_backbone_gw *entry; |
368 | struct batadv_orig_node *orig_node; | |
23721387 SW |
369 | int hash_added; |
370 | ||
3b300de3 | 371 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
372 | |
373 | if (entry) | |
374 | return entry; | |
375 | ||
39c75a51 | 376 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
377 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
378 | orig, vid); | |
23721387 SW |
379 | |
380 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
381 | if (!entry) | |
382 | return NULL; | |
383 | ||
384 | entry->vid = vid; | |
385 | entry->lasttime = jiffies; | |
3964f728 | 386 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
387 | entry->bat_priv = bat_priv; |
388 | atomic_set(&entry->request_sent, 0); | |
389 | memcpy(entry->orig, orig, ETH_ALEN); | |
390 | ||
391 | /* one for the hash, one for returning */ | |
392 | atomic_set(&entry->refcount, 2); | |
393 | ||
807736f6 | 394 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
395 | batadv_compare_backbone_gw, |
396 | batadv_choose_backbone_gw, entry, | |
397 | &entry->hash_entry); | |
23721387 SW |
398 | |
399 | if (unlikely(hash_added != 0)) { | |
400 | /* hash failed, free the structure */ | |
401 | kfree(entry); | |
402 | return NULL; | |
403 | } | |
404 | ||
20ff9d59 | 405 | /* this is a gateway now, remove any tt entries */ |
da641193 | 406 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 407 | if (orig_node) { |
08c36d3e SE |
408 | batadv_tt_global_del_orig(bat_priv, orig_node, |
409 | "became a backbone gateway"); | |
7d211efc | 410 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 411 | } |
23721387 SW |
412 | return entry; |
413 | } | |
414 | ||
415 | /* update or add the own backbone gw to make sure we announce | |
416 | * where we receive other backbone gws | |
417 | */ | |
56303d34 SE |
418 | static void |
419 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
420 | struct batadv_hard_iface *primary_if, | |
421 | short vid) | |
23721387 | 422 | { |
56303d34 | 423 | struct batadv_backbone_gw *backbone_gw; |
23721387 | 424 | |
3b300de3 SE |
425 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
426 | primary_if->net_dev->dev_addr, | |
427 | vid); | |
23721387 SW |
428 | if (unlikely(!backbone_gw)) |
429 | return; | |
430 | ||
431 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 432 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
433 | } |
434 | ||
9cfc7bd6 | 435 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
436 | * @vid: the vid where the request came on |
437 | * | |
438 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
439 | * to allow the requester another check if the CRC is correct now. | |
440 | */ | |
56303d34 SE |
441 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
442 | struct batadv_hard_iface *primary_if, | |
443 | short vid) | |
23721387 SW |
444 | { |
445 | struct hlist_node *node; | |
446 | struct hlist_head *head; | |
5bf74e9c | 447 | struct batadv_hashtable *hash; |
56303d34 SE |
448 | struct batadv_claim *claim; |
449 | struct batadv_backbone_gw *backbone_gw; | |
23721387 SW |
450 | int i; |
451 | ||
39c75a51 | 452 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 453 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 454 | |
3b300de3 SE |
455 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
456 | primary_if->net_dev->dev_addr, | |
457 | vid); | |
23721387 SW |
458 | if (!backbone_gw) |
459 | return; | |
460 | ||
807736f6 | 461 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
462 | for (i = 0; i < hash->size; i++) { |
463 | head = &hash->table[i]; | |
464 | ||
465 | rcu_read_lock(); | |
466 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
467 | /* only own claims are interesting */ | |
468 | if (claim->backbone_gw != backbone_gw) | |
469 | continue; | |
470 | ||
3b300de3 | 471 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 472 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
473 | } |
474 | rcu_read_unlock(); | |
475 | } | |
476 | ||
477 | /* finally, send an announcement frame */ | |
3b300de3 SE |
478 | batadv_bla_send_announce(bat_priv, backbone_gw); |
479 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
480 | } |
481 | ||
9cfc7bd6 | 482 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
483 | * |
484 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
485 | * After the request, it will repeat all of his own claims and finally | |
486 | * send an announcement claim with which we can check again. | |
487 | */ | |
56303d34 | 488 | static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
489 | { |
490 | /* first, remove all old entries */ | |
3b300de3 | 491 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 492 | |
39c75a51 SE |
493 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
494 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
495 | |
496 | /* send request */ | |
3b300de3 | 497 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 498 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
499 | |
500 | /* no local broadcasts should be sent or received, for now. */ | |
501 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 502 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
503 | atomic_set(&backbone_gw->request_sent, 1); |
504 | } | |
505 | } | |
506 | ||
9cfc7bd6 | 507 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
508 | * @backbone_gw: our backbone gateway which should be announced |
509 | * | |
510 | * This function sends an announcement. It is called from multiple | |
511 | * places. | |
512 | */ | |
56303d34 SE |
513 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
514 | struct batadv_backbone_gw *backbone_gw) | |
23721387 SW |
515 | { |
516 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 517 | __be16 crc; |
23721387 | 518 | |
3b300de3 | 519 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 520 | crc = htons(backbone_gw->crc); |
1a5852d8 | 521 | memcpy(&mac[4], &crc, 2); |
23721387 | 522 | |
3b300de3 | 523 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 524 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
525 | |
526 | } | |
527 | ||
2c53040f BH |
528 | /** |
529 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
530 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
531 | * @mac: the mac address of the claim |
532 | * @vid: the VLAN ID of the frame | |
533 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 534 | */ |
56303d34 SE |
535 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
536 | const uint8_t *mac, const short vid, | |
537 | struct batadv_backbone_gw *backbone_gw) | |
23721387 | 538 | { |
56303d34 SE |
539 | struct batadv_claim *claim; |
540 | struct batadv_claim search_claim; | |
23721387 SW |
541 | int hash_added; |
542 | ||
543 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
544 | search_claim.vid = vid; | |
3b300de3 | 545 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
546 | |
547 | /* create a new claim entry if it does not exist yet. */ | |
548 | if (!claim) { | |
549 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
550 | if (!claim) | |
551 | return; | |
552 | ||
553 | memcpy(claim->addr, mac, ETH_ALEN); | |
554 | claim->vid = vid; | |
555 | claim->lasttime = jiffies; | |
556 | claim->backbone_gw = backbone_gw; | |
557 | ||
558 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 559 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
560 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
561 | mac, vid); | |
807736f6 | 562 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
563 | batadv_compare_claim, |
564 | batadv_choose_claim, claim, | |
565 | &claim->hash_entry); | |
23721387 SW |
566 | |
567 | if (unlikely(hash_added != 0)) { | |
568 | /* only local changes happened. */ | |
569 | kfree(claim); | |
570 | return; | |
571 | } | |
572 | } else { | |
573 | claim->lasttime = jiffies; | |
574 | if (claim->backbone_gw == backbone_gw) | |
575 | /* no need to register a new backbone */ | |
576 | goto claim_free_ref; | |
577 | ||
39c75a51 | 578 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
579 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
580 | mac, vid); | |
23721387 SW |
581 | |
582 | claim->backbone_gw->crc ^= | |
583 | crc16(0, claim->addr, ETH_ALEN); | |
3b300de3 | 584 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
585 | |
586 | } | |
587 | /* set (new) backbone gw */ | |
588 | atomic_inc(&backbone_gw->refcount); | |
589 | claim->backbone_gw = backbone_gw; | |
590 | ||
591 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
592 | backbone_gw->lasttime = jiffies; | |
593 | ||
594 | claim_free_ref: | |
3b300de3 | 595 | batadv_claim_free_ref(claim); |
23721387 SW |
596 | } |
597 | ||
598 | /* Delete a claim from the claim hash which has the | |
599 | * given mac address and vid. | |
600 | */ | |
56303d34 SE |
601 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
602 | const uint8_t *mac, const short vid) | |
23721387 | 603 | { |
56303d34 | 604 | struct batadv_claim search_claim, *claim; |
23721387 SW |
605 | |
606 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
607 | search_claim.vid = vid; | |
3b300de3 | 608 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
609 | if (!claim) |
610 | return; | |
611 | ||
39c75a51 SE |
612 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
613 | mac, vid); | |
23721387 | 614 | |
807736f6 | 615 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
616 | batadv_choose_claim, claim); |
617 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
618 | |
619 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
620 | ||
621 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 622 | batadv_claim_free_ref(claim); |
23721387 SW |
623 | } |
624 | ||
625 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 626 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
627 | uint8_t *an_addr, uint8_t *backbone_addr, |
628 | short vid) | |
23721387 | 629 | { |
56303d34 | 630 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
631 | uint16_t crc; |
632 | ||
3b300de3 | 633 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
634 | return 0; |
635 | ||
3b300de3 | 636 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
637 | |
638 | if (unlikely(!backbone_gw)) | |
639 | return 1; | |
640 | ||
641 | ||
642 | /* handle as ANNOUNCE frame */ | |
643 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 644 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 645 | |
39c75a51 | 646 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
647 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", |
648 | vid, backbone_gw->orig, crc); | |
23721387 SW |
649 | |
650 | if (backbone_gw->crc != crc) { | |
39c75a51 | 651 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
652 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", |
653 | backbone_gw->orig, backbone_gw->vid, | |
654 | backbone_gw->crc, crc); | |
23721387 | 655 | |
3b300de3 | 656 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
657 | } else { |
658 | /* if we have sent a request and the crc was OK, | |
659 | * we can allow traffic again. | |
660 | */ | |
661 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 662 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
663 | atomic_set(&backbone_gw->request_sent, 0); |
664 | } | |
665 | } | |
666 | ||
3b300de3 | 667 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
668 | return 1; |
669 | } | |
670 | ||
671 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
672 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
673 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
674 | uint8_t *backbone_addr, |
675 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
676 | { |
677 | /* check for REQUEST frame */ | |
1eda58bf | 678 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
679 | return 0; |
680 | ||
681 | /* sanity check, this should not happen on a normal switch, | |
682 | * we ignore it in this case. | |
683 | */ | |
1eda58bf | 684 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
685 | return 1; |
686 | ||
39c75a51 | 687 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
688 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
689 | vid, ethhdr->h_source); | |
23721387 | 690 | |
3b300de3 | 691 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
692 | return 1; |
693 | } | |
694 | ||
695 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
696 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
697 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
698 | uint8_t *backbone_addr, |
699 | uint8_t *claim_addr, short vid) | |
23721387 | 700 | { |
56303d34 | 701 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
702 | |
703 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
704 | if (primary_if && batadv_compare_eth(backbone_addr, |
705 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 706 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 707 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 708 | |
3b300de3 | 709 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
710 | |
711 | if (!backbone_gw) | |
712 | return 1; | |
713 | ||
714 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 715 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
716 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
717 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 718 | |
3b300de3 SE |
719 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
720 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
721 | return 1; |
722 | } | |
723 | ||
724 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
725 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
726 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
727 | uint8_t *backbone_addr, uint8_t *claim_addr, |
728 | short vid) | |
23721387 | 729 | { |
56303d34 | 730 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
731 | |
732 | /* register the gateway if not yet available, and add the claim. */ | |
733 | ||
3b300de3 | 734 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
735 | |
736 | if (unlikely(!backbone_gw)) | |
737 | return 1; | |
738 | ||
739 | /* this must be a CLAIM frame */ | |
3b300de3 | 740 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 741 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 742 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 743 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
744 | |
745 | /* TODO: we could call something like tt_local_del() here. */ | |
746 | ||
3b300de3 | 747 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
748 | return 1; |
749 | } | |
750 | ||
2c53040f BH |
751 | /** |
752 | * batadv_check_claim_group | |
753 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
754 | * @hw_src: the Hardware source in the ARP Header |
755 | * @hw_dst: the Hardware destination in the ARP Header | |
756 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
757 | * | |
758 | * checks if it is a claim packet and if its on the same group. | |
759 | * This function also applies the group ID of the sender | |
760 | * if it is in the same mesh. | |
761 | * | |
762 | * returns: | |
763 | * 2 - if it is a claim packet and on the same group | |
764 | * 1 - if is a claim packet from another group | |
765 | * 0 - if it is not a claim packet | |
766 | */ | |
56303d34 SE |
767 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
768 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
769 | uint8_t *hw_src, uint8_t *hw_dst, |
770 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
771 | { |
772 | uint8_t *backbone_addr; | |
56303d34 | 773 | struct batadv_orig_node *orig_node; |
96412690 | 774 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 775 | |
96412690 | 776 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 777 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d SW |
778 | |
779 | /* check if it is a claim packet in general */ | |
780 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
781 | sizeof(bla_dst->magic)) != 0) | |
782 | return 0; | |
783 | ||
784 | /* if announcement packet, use the source, | |
785 | * otherwise assume it is in the hw_src | |
786 | */ | |
787 | switch (bla_dst->type) { | |
3eb8773e | 788 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
789 | backbone_addr = hw_src; |
790 | break; | |
acd34afa SE |
791 | case BATADV_CLAIM_TYPE_REQUEST: |
792 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 793 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
794 | backbone_addr = ethhdr->h_source; |
795 | break; | |
796 | default: | |
797 | return 0; | |
798 | } | |
799 | ||
800 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 801 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
802 | return 0; |
803 | ||
804 | /* if its already the same group, it is fine. */ | |
805 | if (bla_dst->group == bla_dst_own->group) | |
806 | return 2; | |
807 | ||
808 | /* lets see if this originator is in our mesh */ | |
da641193 | 809 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
810 | |
811 | /* dont accept claims from gateways which are not in | |
812 | * the same mesh or group. | |
813 | */ | |
814 | if (!orig_node) | |
815 | return 1; | |
816 | ||
817 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
818 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 819 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
820 | "taking other backbones claim group: %04x\n", |
821 | ntohs(bla_dst->group)); | |
38ef3d1d SW |
822 | bla_dst_own->group = bla_dst->group; |
823 | } | |
824 | ||
7d211efc | 825 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
826 | |
827 | return 2; | |
828 | } | |
829 | ||
830 | ||
9cfc7bd6 | 831 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
832 | * @skb: the frame to be checked |
833 | * | |
834 | * Check if this is a claim frame, and process it accordingly. | |
835 | * | |
836 | * returns 1 if it was a claim frame, otherwise return 0 to | |
837 | * tell the callee that it can use the frame on its own. | |
838 | */ | |
56303d34 SE |
839 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
840 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 841 | struct sk_buff *skb) |
23721387 SW |
842 | { |
843 | struct ethhdr *ethhdr; | |
844 | struct vlan_ethhdr *vhdr; | |
845 | struct arphdr *arphdr; | |
846 | uint8_t *hw_src, *hw_dst; | |
96412690 | 847 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
848 | uint16_t proto; |
849 | int headlen; | |
850 | short vid = -1; | |
38ef3d1d | 851 | int ret; |
23721387 SW |
852 | |
853 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
854 | ||
855 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
856 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
857 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
858 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
859 | headlen = sizeof(*vhdr); | |
860 | } else { | |
861 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 862 | headlen = ETH_HLEN; |
23721387 SW |
863 | } |
864 | ||
865 | if (proto != ETH_P_ARP) | |
866 | return 0; /* not a claim frame */ | |
867 | ||
868 | /* this must be a ARP frame. check if it is a claim. */ | |
869 | ||
870 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
871 | return 0; | |
872 | ||
873 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
874 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
875 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
876 | ||
877 | /* Check whether the ARP frame carries a valid | |
878 | * IP information | |
879 | */ | |
23721387 SW |
880 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
881 | return 0; | |
882 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
883 | return 0; | |
884 | if (arphdr->ar_hln != ETH_ALEN) | |
885 | return 0; | |
886 | if (arphdr->ar_pln != 4) | |
887 | return 0; | |
888 | ||
889 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
890 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 891 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
892 | |
893 | /* check if it is a claim frame. */ | |
3b300de3 SE |
894 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
895 | ethhdr); | |
38ef3d1d | 896 | if (ret == 1) |
39c75a51 | 897 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
898 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
899 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
900 | |
901 | if (ret < 2) | |
902 | return ret; | |
23721387 SW |
903 | |
904 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 905 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
906 | |
907 | /* check for the different types of claim frames ... */ | |
908 | switch (bla_dst->type) { | |
3eb8773e | 909 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
910 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
911 | ethhdr->h_source, vid)) | |
23721387 SW |
912 | return 1; |
913 | break; | |
3eb8773e | 914 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
915 | if (batadv_handle_unclaim(bat_priv, primary_if, |
916 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
917 | return 1; |
918 | break; | |
919 | ||
acd34afa | 920 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
921 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
922 | vid)) | |
23721387 SW |
923 | return 1; |
924 | break; | |
acd34afa | 925 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
926 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
927 | vid)) | |
23721387 SW |
928 | return 1; |
929 | break; | |
930 | } | |
931 | ||
39c75a51 | 932 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
933 | "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", |
934 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
935 | return 1; |
936 | } | |
937 | ||
938 | /* Check when we last heard from other nodes, and remove them in case of | |
939 | * a time out, or clean all backbone gws if now is set. | |
940 | */ | |
56303d34 | 941 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 942 | { |
56303d34 | 943 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
944 | struct hlist_node *node, *node_tmp; |
945 | struct hlist_head *head; | |
5bf74e9c | 946 | struct batadv_hashtable *hash; |
23721387 SW |
947 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
948 | int i; | |
949 | ||
807736f6 | 950 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
951 | if (!hash) |
952 | return; | |
953 | ||
954 | for (i = 0; i < hash->size; i++) { | |
955 | head = &hash->table[i]; | |
956 | list_lock = &hash->list_locks[i]; | |
957 | ||
958 | spin_lock_bh(list_lock); | |
959 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
960 | head, hash_entry) { | |
961 | if (now) | |
962 | goto purge_now; | |
1eda58bf | 963 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 964 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
965 | continue; |
966 | ||
39c75a51 | 967 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
968 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
969 | backbone_gw->orig); | |
23721387 SW |
970 | |
971 | purge_now: | |
972 | /* don't wait for the pending request anymore */ | |
973 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 974 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 975 | |
3b300de3 | 976 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
977 | |
978 | hlist_del_rcu(node); | |
3b300de3 | 979 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
980 | } |
981 | spin_unlock_bh(list_lock); | |
982 | } | |
983 | } | |
984 | ||
2c53040f BH |
985 | /** |
986 | * batadv_bla_purge_claims | |
987 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
988 | * @primary_if: the selected primary interface, may be NULL if now is set |
989 | * @now: whether the whole hash shall be wiped now | |
990 | * | |
991 | * Check when we heard last time from our own claims, and remove them in case of | |
992 | * a time out, or clean all claims if now is set | |
993 | */ | |
56303d34 SE |
994 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
995 | struct batadv_hard_iface *primary_if, | |
996 | int now) | |
23721387 | 997 | { |
56303d34 | 998 | struct batadv_claim *claim; |
23721387 SW |
999 | struct hlist_node *node; |
1000 | struct hlist_head *head; | |
5bf74e9c | 1001 | struct batadv_hashtable *hash; |
23721387 SW |
1002 | int i; |
1003 | ||
807736f6 | 1004 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1005 | if (!hash) |
1006 | return; | |
1007 | ||
1008 | for (i = 0; i < hash->size; i++) { | |
1009 | head = &hash->table[i]; | |
1010 | ||
1011 | rcu_read_lock(); | |
1012 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1013 | if (now) | |
1014 | goto purge_now; | |
1eda58bf SE |
1015 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1016 | primary_if->net_dev->dev_addr)) | |
23721387 | 1017 | continue; |
1eda58bf | 1018 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1019 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1020 | continue; |
1021 | ||
39c75a51 | 1022 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1023 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1024 | claim->addr, claim->vid); | |
23721387 SW |
1025 | |
1026 | purge_now: | |
3b300de3 SE |
1027 | batadv_handle_unclaim(bat_priv, primary_if, |
1028 | claim->backbone_gw->orig, | |
1029 | claim->addr, claim->vid); | |
23721387 SW |
1030 | } |
1031 | rcu_read_unlock(); | |
1032 | } | |
1033 | } | |
1034 | ||
2c53040f BH |
1035 | /** |
1036 | * batadv_bla_update_orig_address | |
1037 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1038 | * @primary_if: the new selected primary_if |
1039 | * @oldif: the old primary interface, may be NULL | |
1040 | * | |
1041 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1042 | */ |
56303d34 SE |
1043 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1044 | struct batadv_hard_iface *primary_if, | |
1045 | struct batadv_hard_iface *oldif) | |
23721387 | 1046 | { |
56303d34 | 1047 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1048 | struct hlist_node *node; |
1049 | struct hlist_head *head; | |
5bf74e9c | 1050 | struct batadv_hashtable *hash; |
807736f6 | 1051 | __be16 group; |
23721387 SW |
1052 | int i; |
1053 | ||
38ef3d1d | 1054 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1055 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1056 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1057 | |
23721387 | 1058 | if (!oldif) { |
3b300de3 SE |
1059 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1060 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1061 | return; |
1062 | } | |
1063 | ||
807736f6 | 1064 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1065 | if (!hash) |
1066 | return; | |
1067 | ||
1068 | for (i = 0; i < hash->size; i++) { | |
1069 | head = &hash->table[i]; | |
1070 | ||
1071 | rcu_read_lock(); | |
1072 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1073 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1074 | if (!batadv_compare_eth(backbone_gw->orig, |
1075 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1076 | continue; |
1077 | ||
1078 | memcpy(backbone_gw->orig, | |
1079 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1080 | /* send an announce frame so others will ask for our | |
1081 | * claims and update their tables. | |
1082 | */ | |
3b300de3 | 1083 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1084 | } |
1085 | rcu_read_unlock(); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | ||
1090 | ||
1091 | /* (re)start the timer */ | |
56303d34 | 1092 | static void batadv_bla_start_timer(struct batadv_priv *bat_priv) |
23721387 | 1093 | { |
807736f6 SE |
1094 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1095 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
42d0b044 | 1096 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
23721387 SW |
1097 | } |
1098 | ||
1099 | /* periodic work to do: | |
1100 | * * purge structures when they are too old | |
1101 | * * send announcements | |
1102 | */ | |
3b300de3 | 1103 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 SW |
1104 | { |
1105 | struct delayed_work *delayed_work = | |
1106 | container_of(work, struct delayed_work, work); | |
56303d34 | 1107 | struct batadv_priv *bat_priv; |
807736f6 | 1108 | struct batadv_priv_bla *priv_bla; |
23721387 SW |
1109 | struct hlist_node *node; |
1110 | struct hlist_head *head; | |
56303d34 | 1111 | struct batadv_backbone_gw *backbone_gw; |
5bf74e9c | 1112 | struct batadv_hashtable *hash; |
56303d34 | 1113 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1114 | int i; |
1115 | ||
807736f6 SE |
1116 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1117 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1118 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1119 | if (!primary_if) |
1120 | goto out; | |
1121 | ||
3b300de3 SE |
1122 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1123 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1124 | |
1125 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1126 | goto out; | |
1127 | ||
807736f6 | 1128 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1129 | if (!hash) |
1130 | goto out; | |
1131 | ||
1132 | for (i = 0; i < hash->size; i++) { | |
1133 | head = &hash->table[i]; | |
1134 | ||
1135 | rcu_read_lock(); | |
1136 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1137 | if (!batadv_compare_eth(backbone_gw->orig, |
1138 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1139 | continue; |
1140 | ||
1141 | backbone_gw->lasttime = jiffies; | |
1142 | ||
3b300de3 | 1143 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1144 | } |
1145 | rcu_read_unlock(); | |
1146 | } | |
1147 | out: | |
1148 | if (primary_if) | |
e5d89254 | 1149 | batadv_hardif_free_ref(primary_if); |
23721387 | 1150 | |
3b300de3 | 1151 | batadv_bla_start_timer(bat_priv); |
23721387 SW |
1152 | } |
1153 | ||
5d52dad2 SE |
1154 | /* The hash for claim and backbone hash receive the same key because they |
1155 | * are getting initialized by hash_new with the same key. Reinitializing | |
1156 | * them with to different keys to allow nested locking without generating | |
1157 | * lockdep warnings | |
1158 | */ | |
3b300de3 SE |
1159 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1160 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1161 | |
23721387 | 1162 | /* initialize all bla structures */ |
56303d34 | 1163 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1164 | { |
fe2da6ff | 1165 | int i; |
38ef3d1d | 1166 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1167 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1168 | uint16_t crc; |
1169 | unsigned long entrytime; | |
fe2da6ff | 1170 | |
39c75a51 | 1171 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1172 | |
38ef3d1d | 1173 | /* setting claim destination address */ |
807736f6 SE |
1174 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1175 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1176 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1177 | if (primary_if) { |
807736f6 SE |
1178 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1179 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1180 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1181 | } else { |
807736f6 | 1182 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1183 | } |
1184 | ||
fe2da6ff | 1185 | /* initialize the duplicate list */ |
807736f6 | 1186 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1187 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1188 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1189 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1190 | |
807736f6 | 1191 | if (bat_priv->bla.claim_hash) |
5346c35e | 1192 | return 0; |
23721387 | 1193 | |
807736f6 SE |
1194 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1195 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1196 | |
807736f6 | 1197 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1198 | return -ENOMEM; |
23721387 | 1199 | |
807736f6 | 1200 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1201 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1202 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1203 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1204 | |
39c75a51 | 1205 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1206 | |
3b300de3 | 1207 | batadv_bla_start_timer(bat_priv); |
5346c35e | 1208 | return 0; |
23721387 SW |
1209 | } |
1210 | ||
2c53040f BH |
1211 | /** |
1212 | * batadv_bla_check_bcast_duplist | |
1213 | * @bat_priv: the bat priv with all the soft interface information | |
fe2da6ff SW |
1214 | * @bcast_packet: originator mac address |
1215 | * @hdr_size: maximum length of the frame | |
1216 | * | |
1217 | * check if it is on our broadcast list. Another gateway might | |
1218 | * have sent the same packet because it is connected to the same backbone, | |
1219 | * so we have to remove this duplicate. | |
1220 | * | |
1221 | * This is performed by checking the CRC, which will tell us | |
1222 | * with a good chance that it is the same packet. If it is furthermore | |
1223 | * sent by another host, drop it. We allow equal packets from | |
1224 | * the same host however as this might be intended. | |
9cfc7bd6 | 1225 | */ |
56303d34 | 1226 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
96412690 | 1227 | struct batadv_bcast_packet *bcast_packet, |
08adf151 | 1228 | int hdr_size) |
fe2da6ff SW |
1229 | { |
1230 | int i, length, curr; | |
1231 | uint8_t *content; | |
1232 | uint16_t crc; | |
56303d34 | 1233 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff SW |
1234 | |
1235 | length = hdr_size - sizeof(*bcast_packet); | |
1236 | content = (uint8_t *)bcast_packet; | |
1237 | content += sizeof(*bcast_packet); | |
1238 | ||
1239 | /* calculate the crc ... */ | |
1240 | crc = crc16(0, content, length); | |
1241 | ||
42d0b044 | 1242 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1243 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1244 | curr %= BATADV_DUPLIST_SIZE; | |
1245 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1246 | |
1247 | /* we can stop searching if the entry is too old ; | |
1248 | * later entries will be even older | |
1249 | */ | |
42d0b044 SE |
1250 | if (batadv_has_timed_out(entry->entrytime, |
1251 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1252 | break; |
1253 | ||
1254 | if (entry->crc != crc) | |
1255 | continue; | |
1256 | ||
1eda58bf | 1257 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1258 | continue; |
1259 | ||
1260 | /* this entry seems to match: same crc, not too old, | |
1261 | * and from another gw. therefore return 1 to forbid it. | |
1262 | */ | |
1263 | return 1; | |
1264 | } | |
1265 | /* not found, add a new entry (overwrite the oldest entry) */ | |
807736f6 | 1266 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1267 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1268 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1269 | entry->crc = crc; |
1270 | entry->entrytime = jiffies; | |
1271 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
807736f6 | 1272 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff SW |
1273 | |
1274 | /* allow it, its the first occurence. */ | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | ||
1279 | ||
9cfc7bd6 | 1280 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1281 | * @orig: originator mac address |
1282 | * | |
1283 | * check if the originator is a gateway for any VLAN ID. | |
1284 | * | |
1285 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1286 | */ |
56303d34 | 1287 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1288 | { |
807736f6 | 1289 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 SW |
1290 | struct hlist_head *head; |
1291 | struct hlist_node *node; | |
56303d34 | 1292 | struct batadv_backbone_gw *backbone_gw; |
20ff9d59 SW |
1293 | int i; |
1294 | ||
1295 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1296 | return 0; | |
1297 | ||
1298 | if (!hash) | |
1299 | return 0; | |
1300 | ||
1301 | for (i = 0; i < hash->size; i++) { | |
1302 | head = &hash->table[i]; | |
1303 | ||
1304 | rcu_read_lock(); | |
1305 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1306 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1307 | rcu_read_unlock(); |
1308 | return 1; | |
1309 | } | |
1310 | } | |
1311 | rcu_read_unlock(); | |
1312 | } | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | ||
2c53040f BH |
1318 | /** |
1319 | * batadv_bla_is_backbone_gw | |
1320 | * @skb: the frame to be checked | |
23721387 SW |
1321 | * @orig_node: the orig_node of the frame |
1322 | * @hdr_size: maximum length of the frame | |
1323 | * | |
1324 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1325 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1326 | * returns 0. | |
23721387 | 1327 | */ |
08adf151 | 1328 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1329 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1330 | { |
1331 | struct ethhdr *ethhdr; | |
1332 | struct vlan_ethhdr *vhdr; | |
56303d34 | 1333 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1334 | short vid = -1; |
1335 | ||
1336 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1337 | return 0; | |
1338 | ||
1339 | /* first, find out the vid. */ | |
0d125074 | 1340 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1341 | return 0; |
1342 | ||
1343 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1344 | ||
1345 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1346 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1347 | return 0; | |
1348 | ||
1349 | vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) + | |
1350 | hdr_size); | |
1351 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1352 | } | |
1353 | ||
1354 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1355 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1356 | orig_node->orig, vid); | |
23721387 SW |
1357 | if (!backbone_gw) |
1358 | return 0; | |
1359 | ||
3b300de3 | 1360 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1361 | return 1; |
1362 | } | |
1363 | ||
1364 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1365 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1366 | { |
56303d34 | 1367 | struct batadv_hard_iface *primary_if; |
23721387 | 1368 | |
807736f6 | 1369 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1370 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1371 | |
807736f6 | 1372 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1373 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1374 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1375 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1376 | } |
807736f6 | 1377 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1378 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1379 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1380 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1381 | } |
1382 | if (primary_if) | |
e5d89254 | 1383 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1384 | } |
1385 | ||
2c53040f BH |
1386 | /** |
1387 | * batadv_bla_rx | |
1388 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1389 | * @skb: the frame to be checked |
1390 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1391 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1392 | * |
1393 | * bla_rx avoidance checks if: | |
1394 | * * we have to race for a claim | |
1395 | * * if the frame is allowed on the LAN | |
1396 | * | |
1397 | * in these cases, the skb is further handled by this function and | |
1398 | * returns 1, otherwise it returns 0 and the caller shall further | |
1399 | * process the skb. | |
23721387 | 1400 | */ |
04c9f416 DM |
1401 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, |
1402 | bool is_bcast) | |
23721387 SW |
1403 | { |
1404 | struct ethhdr *ethhdr; | |
56303d34 SE |
1405 | struct batadv_claim search_claim, *claim = NULL; |
1406 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1407 | int ret; |
1408 | ||
1409 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1410 | ||
e5d89254 | 1411 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1412 | if (!primary_if) |
1413 | goto handled; | |
1414 | ||
1415 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1416 | goto allow; | |
1417 | ||
1418 | ||
807736f6 | 1419 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1420 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1421 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1422 | goto handled; |
1423 | ||
1424 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1425 | search_claim.vid = vid; | |
3b300de3 | 1426 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1427 | |
1428 | if (!claim) { | |
1429 | /* possible optimization: race for a claim */ | |
1430 | /* No claim exists yet, claim it for us! | |
1431 | */ | |
3b300de3 SE |
1432 | batadv_handle_claim(bat_priv, primary_if, |
1433 | primary_if->net_dev->dev_addr, | |
1434 | ethhdr->h_source, vid); | |
23721387 SW |
1435 | goto allow; |
1436 | } | |
1437 | ||
1438 | /* if it is our own claim ... */ | |
1eda58bf SE |
1439 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1440 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1441 | /* ... allow it in any case */ |
1442 | claim->lasttime = jiffies; | |
1443 | goto allow; | |
1444 | } | |
1445 | ||
1446 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1447 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1448 | /* ... drop it. the responsible gateway is in charge. | |
1449 | * | |
1450 | * We need to check is_bcast because with the gateway | |
1451 | * feature, broadcasts (like DHCP requests) may be sent | |
1452 | * using a unicast packet type. | |
1453 | */ | |
23721387 SW |
1454 | goto handled; |
1455 | } else { | |
1456 | /* seems the client considers us as its best gateway. | |
1457 | * send a claim and update the claim table | |
1458 | * immediately. | |
1459 | */ | |
3b300de3 SE |
1460 | batadv_handle_claim(bat_priv, primary_if, |
1461 | primary_if->net_dev->dev_addr, | |
1462 | ethhdr->h_source, vid); | |
23721387 SW |
1463 | goto allow; |
1464 | } | |
1465 | allow: | |
3b300de3 | 1466 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1467 | ret = 0; |
1468 | goto out; | |
1469 | ||
1470 | handled: | |
1471 | kfree_skb(skb); | |
1472 | ret = 1; | |
1473 | ||
1474 | out: | |
1475 | if (primary_if) | |
e5d89254 | 1476 | batadv_hardif_free_ref(primary_if); |
23721387 | 1477 | if (claim) |
3b300de3 | 1478 | batadv_claim_free_ref(claim); |
23721387 SW |
1479 | return ret; |
1480 | } | |
1481 | ||
2c53040f BH |
1482 | /** |
1483 | * batadv_bla_tx | |
1484 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1485 | * @skb: the frame to be checked |
1486 | * @vid: the VLAN ID of the frame | |
1487 | * | |
1488 | * bla_tx checks if: | |
1489 | * * a claim was received which has to be processed | |
1490 | * * the frame is allowed on the mesh | |
1491 | * | |
1492 | * in these cases, the skb is further handled by this function and | |
1493 | * returns 1, otherwise it returns 0 and the caller shall further | |
1494 | * process the skb. | |
23721387 | 1495 | */ |
56303d34 | 1496 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1497 | { |
1498 | struct ethhdr *ethhdr; | |
56303d34 SE |
1499 | struct batadv_claim search_claim, *claim = NULL; |
1500 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1501 | int ret = 0; |
1502 | ||
e5d89254 | 1503 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1504 | if (!primary_if) |
1505 | goto out; | |
1506 | ||
1507 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1508 | goto allow; | |
1509 | ||
1510 | /* in VLAN case, the mac header might not be set. */ | |
1511 | skb_reset_mac_header(skb); | |
1512 | ||
3b300de3 | 1513 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1514 | goto handled; |
1515 | ||
1516 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1517 | ||
807736f6 | 1518 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1519 | /* don't allow broadcasts while requests are in flight */ |
1520 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1521 | goto handled; | |
1522 | ||
1523 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1524 | search_claim.vid = vid; | |
1525 | ||
3b300de3 | 1526 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1527 | |
1528 | /* if no claim exists, allow it. */ | |
1529 | if (!claim) | |
1530 | goto allow; | |
1531 | ||
1532 | /* check if we are responsible. */ | |
1eda58bf SE |
1533 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1534 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1535 | /* if yes, the client has roamed and we have |
1536 | * to unclaim it. | |
1537 | */ | |
3b300de3 SE |
1538 | batadv_handle_unclaim(bat_priv, primary_if, |
1539 | primary_if->net_dev->dev_addr, | |
1540 | ethhdr->h_source, vid); | |
23721387 SW |
1541 | goto allow; |
1542 | } | |
1543 | ||
1544 | /* check if it is a multicast/broadcast frame */ | |
1545 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1546 | /* drop it. the responsible gateway has forwarded it into | |
1547 | * the backbone network. | |
1548 | */ | |
1549 | goto handled; | |
1550 | } else { | |
1551 | /* we must allow it. at least if we are | |
1552 | * responsible for the DESTINATION. | |
1553 | */ | |
1554 | goto allow; | |
1555 | } | |
1556 | allow: | |
3b300de3 | 1557 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1558 | ret = 0; |
1559 | goto out; | |
1560 | handled: | |
1561 | ret = 1; | |
1562 | out: | |
1563 | if (primary_if) | |
e5d89254 | 1564 | batadv_hardif_free_ref(primary_if); |
23721387 | 1565 | if (claim) |
3b300de3 | 1566 | batadv_claim_free_ref(claim); |
23721387 SW |
1567 | return ret; |
1568 | } | |
9bf8e4d4 | 1569 | |
08adf151 | 1570 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1571 | { |
1572 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1573 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1574 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
56303d34 SE |
1575 | struct batadv_claim *claim; |
1576 | struct batadv_hard_iface *primary_if; | |
9bf8e4d4 SW |
1577 | struct hlist_node *node; |
1578 | struct hlist_head *head; | |
1579 | uint32_t i; | |
1580 | bool is_own; | |
1581 | int ret = 0; | |
1eda58bf | 1582 | uint8_t *primary_addr; |
9bf8e4d4 | 1583 | |
e5d89254 | 1584 | primary_if = batadv_primary_if_get_selected(bat_priv); |
9bf8e4d4 SW |
1585 | if (!primary_if) { |
1586 | ret = seq_printf(seq, | |
1587 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1588 | net_dev->name); | |
1589 | goto out; | |
1590 | } | |
1591 | ||
e9a4f295 | 1592 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
9bf8e4d4 SW |
1593 | ret = seq_printf(seq, |
1594 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1595 | net_dev->name); | |
1596 | goto out; | |
1597 | } | |
1598 | ||
1eda58bf | 1599 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d SW |
1600 | seq_printf(seq, |
1601 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1eda58bf | 1602 | net_dev->name, primary_addr, |
807736f6 | 1603 | ntohs(bat_priv->bla.claim_dest.group)); |
9bf8e4d4 SW |
1604 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1605 | "Client", "VID", "Originator", "CRC"); | |
1606 | for (i = 0; i < hash->size; i++) { | |
1607 | head = &hash->table[i]; | |
1608 | ||
1609 | rcu_read_lock(); | |
1610 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1611 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1612 | primary_addr); | |
9bf8e4d4 SW |
1613 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", |
1614 | claim->addr, claim->vid, | |
1615 | claim->backbone_gw->orig, | |
1616 | (is_own ? 'x' : ' '), | |
1617 | claim->backbone_gw->crc); | |
1618 | } | |
1619 | rcu_read_unlock(); | |
1620 | } | |
1621 | out: | |
1622 | if (primary_if) | |
e5d89254 | 1623 | batadv_hardif_free_ref(primary_if); |
9bf8e4d4 SW |
1624 | return ret; |
1625 | } | |
536a23f1 SW |
1626 | |
1627 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1628 | { | |
1629 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1630 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1631 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
536a23f1 SW |
1632 | struct batadv_backbone_gw *backbone_gw; |
1633 | struct batadv_hard_iface *primary_if; | |
1634 | struct hlist_node *node; | |
1635 | struct hlist_head *head; | |
1636 | int secs, msecs; | |
1637 | uint32_t i; | |
1638 | bool is_own; | |
1639 | int ret = 0; | |
1640 | uint8_t *primary_addr; | |
1641 | ||
1642 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1643 | if (!primary_if) { | |
1644 | ret = seq_printf(seq, | |
1645 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1646 | net_dev->name); | |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | if (primary_if->if_status != BATADV_IF_ACTIVE) { | |
1651 | ret = seq_printf(seq, | |
1652 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1653 | net_dev->name); | |
1654 | goto out; | |
1655 | } | |
1656 | ||
1657 | primary_addr = primary_if->net_dev->dev_addr; | |
1658 | seq_printf(seq, | |
1659 | "Backbones announced for the mesh %s (orig %pM, group id %04x)\n", | |
1660 | net_dev->name, primary_addr, | |
807736f6 | 1661 | ntohs(bat_priv->bla.claim_dest.group)); |
536a23f1 SW |
1662 | seq_printf(seq, " %-17s %-5s %-9s (%-4s)\n", |
1663 | "Originator", "VID", "last seen", "CRC"); | |
1664 | for (i = 0; i < hash->size; i++) { | |
1665 | head = &hash->table[i]; | |
1666 | ||
1667 | rcu_read_lock(); | |
1668 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1669 | msecs = jiffies_to_msecs(jiffies - | |
1670 | backbone_gw->lasttime); | |
1671 | secs = msecs / 1000; | |
1672 | msecs = msecs % 1000; | |
1673 | ||
1674 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1675 | primary_addr); | |
1676 | if (is_own) | |
1677 | continue; | |
1678 | ||
1679 | seq_printf(seq, | |
1680 | " * %pM on % 5d % 4i.%03is (%04x)\n", | |
1681 | backbone_gw->orig, backbone_gw->vid, | |
1682 | secs, msecs, backbone_gw->crc); | |
1683 | } | |
1684 | rcu_read_unlock(); | |
1685 | } | |
1686 | out: | |
1687 | if (primary_if) | |
1688 | batadv_hardif_free_ref(primary_if); | |
1689 | return ret; | |
1690 | } |