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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, | |
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); | |
343 | bat_priv->stats.rx_packets++; | |
0d125074 | 344 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN; |
23721387 SW |
345 | soft_iface->last_rx = jiffies; |
346 | ||
347 | netif_rx(skb); | |
348 | out: | |
349 | if (primary_if) | |
e5d89254 | 350 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
351 | } |
352 | ||
2c53040f BH |
353 | /** |
354 | * batadv_bla_get_backbone_gw | |
355 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
356 | * @orig: the mac address of the originator |
357 | * @vid: the VLAN ID | |
358 | * | |
359 | * searches for the backbone gw or creates a new one if it could not | |
360 | * be found. | |
361 | */ | |
56303d34 SE |
362 | static struct batadv_backbone_gw * |
363 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, | |
364 | short vid) | |
23721387 | 365 | { |
56303d34 SE |
366 | struct batadv_backbone_gw *entry; |
367 | struct batadv_orig_node *orig_node; | |
23721387 SW |
368 | int hash_added; |
369 | ||
3b300de3 | 370 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
371 | |
372 | if (entry) | |
373 | return entry; | |
374 | ||
39c75a51 | 375 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
376 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
377 | orig, vid); | |
23721387 SW |
378 | |
379 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
380 | if (!entry) | |
381 | return NULL; | |
382 | ||
383 | entry->vid = vid; | |
384 | entry->lasttime = jiffies; | |
3964f728 | 385 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
386 | entry->bat_priv = bat_priv; |
387 | atomic_set(&entry->request_sent, 0); | |
388 | memcpy(entry->orig, orig, ETH_ALEN); | |
389 | ||
390 | /* one for the hash, one for returning */ | |
391 | atomic_set(&entry->refcount, 2); | |
392 | ||
c0a55929 | 393 | hash_added = batadv_hash_add(bat_priv->backbone_hash, |
3b300de3 SE |
394 | batadv_compare_backbone_gw, |
395 | batadv_choose_backbone_gw, entry, | |
396 | &entry->hash_entry); | |
23721387 SW |
397 | |
398 | if (unlikely(hash_added != 0)) { | |
399 | /* hash failed, free the structure */ | |
400 | kfree(entry); | |
401 | return NULL; | |
402 | } | |
403 | ||
20ff9d59 | 404 | /* this is a gateway now, remove any tt entries */ |
da641193 | 405 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 406 | if (orig_node) { |
08c36d3e SE |
407 | batadv_tt_global_del_orig(bat_priv, orig_node, |
408 | "became a backbone gateway"); | |
7d211efc | 409 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 410 | } |
23721387 SW |
411 | return entry; |
412 | } | |
413 | ||
414 | /* update or add the own backbone gw to make sure we announce | |
415 | * where we receive other backbone gws | |
416 | */ | |
56303d34 SE |
417 | static void |
418 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
419 | struct batadv_hard_iface *primary_if, | |
420 | short vid) | |
23721387 | 421 | { |
56303d34 | 422 | struct batadv_backbone_gw *backbone_gw; |
23721387 | 423 | |
3b300de3 SE |
424 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
425 | primary_if->net_dev->dev_addr, | |
426 | vid); | |
23721387 SW |
427 | if (unlikely(!backbone_gw)) |
428 | return; | |
429 | ||
430 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 431 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
432 | } |
433 | ||
9cfc7bd6 | 434 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
435 | * @vid: the vid where the request came on |
436 | * | |
437 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
438 | * to allow the requester another check if the CRC is correct now. | |
439 | */ | |
56303d34 SE |
440 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
441 | struct batadv_hard_iface *primary_if, | |
442 | short vid) | |
23721387 SW |
443 | { |
444 | struct hlist_node *node; | |
445 | struct hlist_head *head; | |
5bf74e9c | 446 | struct batadv_hashtable *hash; |
56303d34 SE |
447 | struct batadv_claim *claim; |
448 | struct batadv_backbone_gw *backbone_gw; | |
23721387 SW |
449 | int i; |
450 | ||
39c75a51 | 451 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 452 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 453 | |
3b300de3 SE |
454 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
455 | primary_if->net_dev->dev_addr, | |
456 | vid); | |
23721387 SW |
457 | if (!backbone_gw) |
458 | return; | |
459 | ||
460 | hash = bat_priv->claim_hash; | |
461 | for (i = 0; i < hash->size; i++) { | |
462 | head = &hash->table[i]; | |
463 | ||
464 | rcu_read_lock(); | |
465 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
466 | /* only own claims are interesting */ | |
467 | if (claim->backbone_gw != backbone_gw) | |
468 | continue; | |
469 | ||
3b300de3 | 470 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 471 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
472 | } |
473 | rcu_read_unlock(); | |
474 | } | |
475 | ||
476 | /* finally, send an announcement frame */ | |
3b300de3 SE |
477 | batadv_bla_send_announce(bat_priv, backbone_gw); |
478 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
479 | } |
480 | ||
9cfc7bd6 | 481 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
482 | * |
483 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
484 | * After the request, it will repeat all of his own claims and finally | |
485 | * send an announcement claim with which we can check again. | |
486 | */ | |
56303d34 | 487 | static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
488 | { |
489 | /* first, remove all old entries */ | |
3b300de3 | 490 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 491 | |
39c75a51 SE |
492 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
493 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
494 | |
495 | /* send request */ | |
3b300de3 | 496 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 497 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
498 | |
499 | /* no local broadcasts should be sent or received, for now. */ | |
500 | if (!atomic_read(&backbone_gw->request_sent)) { | |
501 | atomic_inc(&backbone_gw->bat_priv->bla_num_requests); | |
502 | atomic_set(&backbone_gw->request_sent, 1); | |
503 | } | |
504 | } | |
505 | ||
9cfc7bd6 | 506 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
507 | * @backbone_gw: our backbone gateway which should be announced |
508 | * | |
509 | * This function sends an announcement. It is called from multiple | |
510 | * places. | |
511 | */ | |
56303d34 SE |
512 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
513 | struct batadv_backbone_gw *backbone_gw) | |
23721387 SW |
514 | { |
515 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 516 | __be16 crc; |
23721387 | 517 | |
3b300de3 | 518 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 519 | crc = htons(backbone_gw->crc); |
1a5852d8 | 520 | memcpy(&mac[4], &crc, 2); |
23721387 | 521 | |
3b300de3 | 522 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 523 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
524 | |
525 | } | |
526 | ||
2c53040f BH |
527 | /** |
528 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
529 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
530 | * @mac: the mac address of the claim |
531 | * @vid: the VLAN ID of the frame | |
532 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 533 | */ |
56303d34 SE |
534 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
535 | const uint8_t *mac, const short vid, | |
536 | struct batadv_backbone_gw *backbone_gw) | |
23721387 | 537 | { |
56303d34 SE |
538 | struct batadv_claim *claim; |
539 | struct batadv_claim search_claim; | |
23721387 SW |
540 | int hash_added; |
541 | ||
542 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
543 | search_claim.vid = vid; | |
3b300de3 | 544 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
545 | |
546 | /* create a new claim entry if it does not exist yet. */ | |
547 | if (!claim) { | |
548 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
549 | if (!claim) | |
550 | return; | |
551 | ||
552 | memcpy(claim->addr, mac, ETH_ALEN); | |
553 | claim->vid = vid; | |
554 | claim->lasttime = jiffies; | |
555 | claim->backbone_gw = backbone_gw; | |
556 | ||
557 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 558 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
559 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
560 | mac, vid); | |
c0a55929 | 561 | hash_added = batadv_hash_add(bat_priv->claim_hash, |
3b300de3 SE |
562 | batadv_compare_claim, |
563 | batadv_choose_claim, claim, | |
564 | &claim->hash_entry); | |
23721387 SW |
565 | |
566 | if (unlikely(hash_added != 0)) { | |
567 | /* only local changes happened. */ | |
568 | kfree(claim); | |
569 | return; | |
570 | } | |
571 | } else { | |
572 | claim->lasttime = jiffies; | |
573 | if (claim->backbone_gw == backbone_gw) | |
574 | /* no need to register a new backbone */ | |
575 | goto claim_free_ref; | |
576 | ||
39c75a51 | 577 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
578 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
579 | mac, vid); | |
23721387 SW |
580 | |
581 | claim->backbone_gw->crc ^= | |
582 | crc16(0, claim->addr, ETH_ALEN); | |
3b300de3 | 583 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
584 | |
585 | } | |
586 | /* set (new) backbone gw */ | |
587 | atomic_inc(&backbone_gw->refcount); | |
588 | claim->backbone_gw = backbone_gw; | |
589 | ||
590 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
591 | backbone_gw->lasttime = jiffies; | |
592 | ||
593 | claim_free_ref: | |
3b300de3 | 594 | batadv_claim_free_ref(claim); |
23721387 SW |
595 | } |
596 | ||
597 | /* Delete a claim from the claim hash which has the | |
598 | * given mac address and vid. | |
599 | */ | |
56303d34 SE |
600 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
601 | const uint8_t *mac, const short vid) | |
23721387 | 602 | { |
56303d34 | 603 | struct batadv_claim search_claim, *claim; |
23721387 SW |
604 | |
605 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
606 | search_claim.vid = vid; | |
3b300de3 | 607 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
608 | if (!claim) |
609 | return; | |
610 | ||
39c75a51 SE |
611 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
612 | mac, vid); | |
23721387 | 613 | |
3b300de3 SE |
614 | batadv_hash_remove(bat_priv->claim_hash, batadv_compare_claim, |
615 | batadv_choose_claim, claim); | |
616 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
617 | |
618 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
619 | ||
620 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 621 | batadv_claim_free_ref(claim); |
23721387 SW |
622 | } |
623 | ||
624 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 625 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
626 | uint8_t *an_addr, uint8_t *backbone_addr, |
627 | short vid) | |
23721387 | 628 | { |
56303d34 | 629 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
630 | uint16_t crc; |
631 | ||
3b300de3 | 632 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
633 | return 0; |
634 | ||
3b300de3 | 635 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
636 | |
637 | if (unlikely(!backbone_gw)) | |
638 | return 1; | |
639 | ||
640 | ||
641 | /* handle as ANNOUNCE frame */ | |
642 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 643 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 644 | |
39c75a51 | 645 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
646 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", |
647 | vid, backbone_gw->orig, crc); | |
23721387 SW |
648 | |
649 | if (backbone_gw->crc != crc) { | |
39c75a51 | 650 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
651 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", |
652 | backbone_gw->orig, backbone_gw->vid, | |
653 | backbone_gw->crc, crc); | |
23721387 | 654 | |
3b300de3 | 655 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
656 | } else { |
657 | /* if we have sent a request and the crc was OK, | |
658 | * we can allow traffic again. | |
659 | */ | |
660 | if (atomic_read(&backbone_gw->request_sent)) { | |
661 | atomic_dec(&backbone_gw->bat_priv->bla_num_requests); | |
662 | atomic_set(&backbone_gw->request_sent, 0); | |
663 | } | |
664 | } | |
665 | ||
3b300de3 | 666 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
667 | return 1; |
668 | } | |
669 | ||
670 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
671 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
672 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
673 | uint8_t *backbone_addr, |
674 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
675 | { |
676 | /* check for REQUEST frame */ | |
1eda58bf | 677 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
678 | return 0; |
679 | ||
680 | /* sanity check, this should not happen on a normal switch, | |
681 | * we ignore it in this case. | |
682 | */ | |
1eda58bf | 683 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
684 | return 1; |
685 | ||
39c75a51 | 686 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
687 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
688 | vid, ethhdr->h_source); | |
23721387 | 689 | |
3b300de3 | 690 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
691 | return 1; |
692 | } | |
693 | ||
694 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
695 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
696 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
697 | uint8_t *backbone_addr, |
698 | uint8_t *claim_addr, short vid) | |
23721387 | 699 | { |
56303d34 | 700 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
701 | |
702 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
703 | if (primary_if && batadv_compare_eth(backbone_addr, |
704 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 705 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 706 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 707 | |
3b300de3 | 708 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
709 | |
710 | if (!backbone_gw) | |
711 | return 1; | |
712 | ||
713 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 714 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
715 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
716 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 717 | |
3b300de3 SE |
718 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
719 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
720 | return 1; |
721 | } | |
722 | ||
723 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
724 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
725 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
726 | uint8_t *backbone_addr, uint8_t *claim_addr, |
727 | short vid) | |
23721387 | 728 | { |
56303d34 | 729 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
730 | |
731 | /* register the gateway if not yet available, and add the claim. */ | |
732 | ||
3b300de3 | 733 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
734 | |
735 | if (unlikely(!backbone_gw)) | |
736 | return 1; | |
737 | ||
738 | /* this must be a CLAIM frame */ | |
3b300de3 | 739 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 740 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 741 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 742 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
743 | |
744 | /* TODO: we could call something like tt_local_del() here. */ | |
745 | ||
3b300de3 | 746 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
747 | return 1; |
748 | } | |
749 | ||
2c53040f BH |
750 | /** |
751 | * batadv_check_claim_group | |
752 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
753 | * @hw_src: the Hardware source in the ARP Header |
754 | * @hw_dst: the Hardware destination in the ARP Header | |
755 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
756 | * | |
757 | * checks if it is a claim packet and if its on the same group. | |
758 | * This function also applies the group ID of the sender | |
759 | * if it is in the same mesh. | |
760 | * | |
761 | * returns: | |
762 | * 2 - if it is a claim packet and on the same group | |
763 | * 1 - if is a claim packet from another group | |
764 | * 0 - if it is not a claim packet | |
765 | */ | |
56303d34 SE |
766 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
767 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
768 | uint8_t *hw_src, uint8_t *hw_dst, |
769 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
770 | { |
771 | uint8_t *backbone_addr; | |
56303d34 | 772 | struct batadv_orig_node *orig_node; |
96412690 | 773 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 774 | |
96412690 | 775 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
38ef3d1d SW |
776 | bla_dst_own = &bat_priv->claim_dest; |
777 | ||
778 | /* check if it is a claim packet in general */ | |
779 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
780 | sizeof(bla_dst->magic)) != 0) | |
781 | return 0; | |
782 | ||
783 | /* if announcement packet, use the source, | |
784 | * otherwise assume it is in the hw_src | |
785 | */ | |
786 | switch (bla_dst->type) { | |
3eb8773e | 787 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
788 | backbone_addr = hw_src; |
789 | break; | |
acd34afa SE |
790 | case BATADV_CLAIM_TYPE_REQUEST: |
791 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 792 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
793 | backbone_addr = ethhdr->h_source; |
794 | break; | |
795 | default: | |
796 | return 0; | |
797 | } | |
798 | ||
799 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 800 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
801 | return 0; |
802 | ||
803 | /* if its already the same group, it is fine. */ | |
804 | if (bla_dst->group == bla_dst_own->group) | |
805 | return 2; | |
806 | ||
807 | /* lets see if this originator is in our mesh */ | |
da641193 | 808 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
809 | |
810 | /* dont accept claims from gateways which are not in | |
811 | * the same mesh or group. | |
812 | */ | |
813 | if (!orig_node) | |
814 | return 1; | |
815 | ||
816 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
817 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 818 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
819 | "taking other backbones claim group: %04x\n", |
820 | ntohs(bla_dst->group)); | |
38ef3d1d SW |
821 | bla_dst_own->group = bla_dst->group; |
822 | } | |
823 | ||
7d211efc | 824 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
825 | |
826 | return 2; | |
827 | } | |
828 | ||
829 | ||
9cfc7bd6 | 830 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
831 | * @skb: the frame to be checked |
832 | * | |
833 | * Check if this is a claim frame, and process it accordingly. | |
834 | * | |
835 | * returns 1 if it was a claim frame, otherwise return 0 to | |
836 | * tell the callee that it can use the frame on its own. | |
837 | */ | |
56303d34 SE |
838 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
839 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 840 | struct sk_buff *skb) |
23721387 SW |
841 | { |
842 | struct ethhdr *ethhdr; | |
843 | struct vlan_ethhdr *vhdr; | |
844 | struct arphdr *arphdr; | |
845 | uint8_t *hw_src, *hw_dst; | |
96412690 | 846 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
847 | uint16_t proto; |
848 | int headlen; | |
849 | short vid = -1; | |
38ef3d1d | 850 | int ret; |
23721387 SW |
851 | |
852 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
853 | ||
854 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
855 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
856 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
857 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
858 | headlen = sizeof(*vhdr); | |
859 | } else { | |
860 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 861 | headlen = ETH_HLEN; |
23721387 SW |
862 | } |
863 | ||
864 | if (proto != ETH_P_ARP) | |
865 | return 0; /* not a claim frame */ | |
866 | ||
867 | /* this must be a ARP frame. check if it is a claim. */ | |
868 | ||
869 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
870 | return 0; | |
871 | ||
872 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
873 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
874 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
875 | ||
876 | /* Check whether the ARP frame carries a valid | |
877 | * IP information | |
878 | */ | |
23721387 SW |
879 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
880 | return 0; | |
881 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
882 | return 0; | |
883 | if (arphdr->ar_hln != ETH_ALEN) | |
884 | return 0; | |
885 | if (arphdr->ar_pln != 4) | |
886 | return 0; | |
887 | ||
888 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
889 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 890 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
891 | |
892 | /* check if it is a claim frame. */ | |
3b300de3 SE |
893 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
894 | ethhdr); | |
38ef3d1d | 895 | if (ret == 1) |
39c75a51 | 896 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
897 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
898 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
899 | |
900 | if (ret < 2) | |
901 | return ret; | |
23721387 SW |
902 | |
903 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 904 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
905 | |
906 | /* check for the different types of claim frames ... */ | |
907 | switch (bla_dst->type) { | |
3eb8773e | 908 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
909 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
910 | ethhdr->h_source, vid)) | |
23721387 SW |
911 | return 1; |
912 | break; | |
3eb8773e | 913 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
914 | if (batadv_handle_unclaim(bat_priv, primary_if, |
915 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
916 | return 1; |
917 | break; | |
918 | ||
acd34afa | 919 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
920 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
921 | vid)) | |
23721387 SW |
922 | return 1; |
923 | break; | |
acd34afa | 924 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
925 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
926 | vid)) | |
23721387 SW |
927 | return 1; |
928 | break; | |
929 | } | |
930 | ||
39c75a51 | 931 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
932 | "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", |
933 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
934 | return 1; |
935 | } | |
936 | ||
937 | /* Check when we last heard from other nodes, and remove them in case of | |
938 | * a time out, or clean all backbone gws if now is set. | |
939 | */ | |
56303d34 | 940 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 941 | { |
56303d34 | 942 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
943 | struct hlist_node *node, *node_tmp; |
944 | struct hlist_head *head; | |
5bf74e9c | 945 | struct batadv_hashtable *hash; |
23721387 SW |
946 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
947 | int i; | |
948 | ||
949 | hash = bat_priv->backbone_hash; | |
950 | if (!hash) | |
951 | return; | |
952 | ||
953 | for (i = 0; i < hash->size; i++) { | |
954 | head = &hash->table[i]; | |
955 | list_lock = &hash->list_locks[i]; | |
956 | ||
957 | spin_lock_bh(list_lock); | |
958 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
959 | head, hash_entry) { | |
960 | if (now) | |
961 | goto purge_now; | |
1eda58bf | 962 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 963 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
964 | continue; |
965 | ||
39c75a51 | 966 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
967 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
968 | backbone_gw->orig); | |
23721387 SW |
969 | |
970 | purge_now: | |
971 | /* don't wait for the pending request anymore */ | |
972 | if (atomic_read(&backbone_gw->request_sent)) | |
973 | atomic_dec(&bat_priv->bla_num_requests); | |
974 | ||
3b300de3 | 975 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
976 | |
977 | hlist_del_rcu(node); | |
3b300de3 | 978 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
979 | } |
980 | spin_unlock_bh(list_lock); | |
981 | } | |
982 | } | |
983 | ||
2c53040f BH |
984 | /** |
985 | * batadv_bla_purge_claims | |
986 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
987 | * @primary_if: the selected primary interface, may be NULL if now is set |
988 | * @now: whether the whole hash shall be wiped now | |
989 | * | |
990 | * Check when we heard last time from our own claims, and remove them in case of | |
991 | * a time out, or clean all claims if now is set | |
992 | */ | |
56303d34 SE |
993 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
994 | struct batadv_hard_iface *primary_if, | |
995 | int now) | |
23721387 | 996 | { |
56303d34 | 997 | struct batadv_claim *claim; |
23721387 SW |
998 | struct hlist_node *node; |
999 | struct hlist_head *head; | |
5bf74e9c | 1000 | struct batadv_hashtable *hash; |
23721387 SW |
1001 | int i; |
1002 | ||
1003 | hash = bat_priv->claim_hash; | |
1004 | if (!hash) | |
1005 | return; | |
1006 | ||
1007 | for (i = 0; i < hash->size; i++) { | |
1008 | head = &hash->table[i]; | |
1009 | ||
1010 | rcu_read_lock(); | |
1011 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1012 | if (now) | |
1013 | goto purge_now; | |
1eda58bf SE |
1014 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1015 | primary_if->net_dev->dev_addr)) | |
23721387 | 1016 | continue; |
1eda58bf | 1017 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1018 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1019 | continue; |
1020 | ||
39c75a51 | 1021 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1022 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1023 | claim->addr, claim->vid); | |
23721387 SW |
1024 | |
1025 | purge_now: | |
3b300de3 SE |
1026 | batadv_handle_unclaim(bat_priv, primary_if, |
1027 | claim->backbone_gw->orig, | |
1028 | claim->addr, claim->vid); | |
23721387 SW |
1029 | } |
1030 | rcu_read_unlock(); | |
1031 | } | |
1032 | } | |
1033 | ||
2c53040f BH |
1034 | /** |
1035 | * batadv_bla_update_orig_address | |
1036 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1037 | * @primary_if: the new selected primary_if |
1038 | * @oldif: the old primary interface, may be NULL | |
1039 | * | |
1040 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1041 | */ |
56303d34 SE |
1042 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1043 | struct batadv_hard_iface *primary_if, | |
1044 | struct batadv_hard_iface *oldif) | |
23721387 | 1045 | { |
56303d34 | 1046 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1047 | struct hlist_node *node; |
1048 | struct hlist_head *head; | |
5bf74e9c | 1049 | struct batadv_hashtable *hash; |
23721387 SW |
1050 | int i; |
1051 | ||
38ef3d1d SW |
1052 | /* reset bridge loop avoidance group id */ |
1053 | bat_priv->claim_dest.group = | |
1054 | htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); | |
1055 | ||
23721387 | 1056 | if (!oldif) { |
3b300de3 SE |
1057 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1058 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1059 | return; |
1060 | } | |
1061 | ||
1062 | hash = bat_priv->backbone_hash; | |
1063 | if (!hash) | |
1064 | return; | |
1065 | ||
1066 | for (i = 0; i < hash->size; i++) { | |
1067 | head = &hash->table[i]; | |
1068 | ||
1069 | rcu_read_lock(); | |
1070 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1071 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1072 | if (!batadv_compare_eth(backbone_gw->orig, |
1073 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1074 | continue; |
1075 | ||
1076 | memcpy(backbone_gw->orig, | |
1077 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1078 | /* send an announce frame so others will ask for our | |
1079 | * claims and update their tables. | |
1080 | */ | |
3b300de3 | 1081 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1082 | } |
1083 | rcu_read_unlock(); | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | ||
1088 | ||
1089 | /* (re)start the timer */ | |
56303d34 | 1090 | static void batadv_bla_start_timer(struct batadv_priv *bat_priv) |
23721387 | 1091 | { |
3b300de3 | 1092 | INIT_DELAYED_WORK(&bat_priv->bla_work, batadv_bla_periodic_work); |
3193e8fd | 1093 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work, |
42d0b044 | 1094 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
23721387 SW |
1095 | } |
1096 | ||
1097 | /* periodic work to do: | |
1098 | * * purge structures when they are too old | |
1099 | * * send announcements | |
1100 | */ | |
3b300de3 | 1101 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 SW |
1102 | { |
1103 | struct delayed_work *delayed_work = | |
1104 | container_of(work, struct delayed_work, work); | |
56303d34 | 1105 | struct batadv_priv *bat_priv; |
23721387 SW |
1106 | struct hlist_node *node; |
1107 | struct hlist_head *head; | |
56303d34 | 1108 | struct batadv_backbone_gw *backbone_gw; |
5bf74e9c | 1109 | struct batadv_hashtable *hash; |
56303d34 | 1110 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1111 | int i; |
1112 | ||
56303d34 | 1113 | bat_priv = container_of(delayed_work, struct batadv_priv, bla_work); |
e5d89254 | 1114 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1115 | if (!primary_if) |
1116 | goto out; | |
1117 | ||
3b300de3 SE |
1118 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1119 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1120 | |
1121 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1122 | goto out; | |
1123 | ||
1124 | hash = bat_priv->backbone_hash; | |
1125 | if (!hash) | |
1126 | goto out; | |
1127 | ||
1128 | for (i = 0; i < hash->size; i++) { | |
1129 | head = &hash->table[i]; | |
1130 | ||
1131 | rcu_read_lock(); | |
1132 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1133 | if (!batadv_compare_eth(backbone_gw->orig, |
1134 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1135 | continue; |
1136 | ||
1137 | backbone_gw->lasttime = jiffies; | |
1138 | ||
3b300de3 | 1139 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1140 | } |
1141 | rcu_read_unlock(); | |
1142 | } | |
1143 | out: | |
1144 | if (primary_if) | |
e5d89254 | 1145 | batadv_hardif_free_ref(primary_if); |
23721387 | 1146 | |
3b300de3 | 1147 | batadv_bla_start_timer(bat_priv); |
23721387 SW |
1148 | } |
1149 | ||
5d52dad2 SE |
1150 | /* The hash for claim and backbone hash receive the same key because they |
1151 | * are getting initialized by hash_new with the same key. Reinitializing | |
1152 | * them with to different keys to allow nested locking without generating | |
1153 | * lockdep warnings | |
1154 | */ | |
3b300de3 SE |
1155 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1156 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1157 | |
23721387 | 1158 | /* initialize all bla structures */ |
56303d34 | 1159 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1160 | { |
fe2da6ff | 1161 | int i; |
38ef3d1d | 1162 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1163 | struct batadv_hard_iface *primary_if; |
fe2da6ff | 1164 | |
39c75a51 | 1165 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1166 | |
38ef3d1d SW |
1167 | /* setting claim destination address */ |
1168 | memcpy(&bat_priv->claim_dest.magic, claim_dest, 3); | |
1169 | bat_priv->claim_dest.type = 0; | |
e5d89254 | 1170 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d SW |
1171 | if (primary_if) { |
1172 | bat_priv->claim_dest.group = | |
1173 | htons(crc16(0, primary_if->net_dev->dev_addr, | |
1174 | ETH_ALEN)); | |
e5d89254 | 1175 | batadv_hardif_free_ref(primary_if); |
38ef3d1d SW |
1176 | } else { |
1177 | bat_priv->claim_dest.group = 0; /* will be set later */ | |
1178 | } | |
1179 | ||
fe2da6ff | 1180 | /* initialize the duplicate list */ |
42d0b044 | 1181 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
fe2da6ff | 1182 | bat_priv->bcast_duplist[i].entrytime = |
42d0b044 | 1183 | jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
fe2da6ff SW |
1184 | bat_priv->bcast_duplist_curr = 0; |
1185 | ||
23721387 | 1186 | if (bat_priv->claim_hash) |
5346c35e | 1187 | return 0; |
23721387 | 1188 | |
1a8eaf07 SE |
1189 | bat_priv->claim_hash = batadv_hash_new(128); |
1190 | bat_priv->backbone_hash = batadv_hash_new(32); | |
23721387 SW |
1191 | |
1192 | if (!bat_priv->claim_hash || !bat_priv->backbone_hash) | |
5346c35e | 1193 | return -ENOMEM; |
23721387 | 1194 | |
5d52dad2 | 1195 | batadv_hash_set_lock_class(bat_priv->claim_hash, |
3b300de3 | 1196 | &batadv_claim_hash_lock_class_key); |
5d52dad2 | 1197 | batadv_hash_set_lock_class(bat_priv->backbone_hash, |
3b300de3 | 1198 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1199 | |
39c75a51 | 1200 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1201 | |
3b300de3 | 1202 | batadv_bla_start_timer(bat_priv); |
5346c35e | 1203 | return 0; |
23721387 SW |
1204 | } |
1205 | ||
2c53040f BH |
1206 | /** |
1207 | * batadv_bla_check_bcast_duplist | |
1208 | * @bat_priv: the bat priv with all the soft interface information | |
fe2da6ff SW |
1209 | * @bcast_packet: originator mac address |
1210 | * @hdr_size: maximum length of the frame | |
1211 | * | |
1212 | * check if it is on our broadcast list. Another gateway might | |
1213 | * have sent the same packet because it is connected to the same backbone, | |
1214 | * so we have to remove this duplicate. | |
1215 | * | |
1216 | * This is performed by checking the CRC, which will tell us | |
1217 | * with a good chance that it is the same packet. If it is furthermore | |
1218 | * sent by another host, drop it. We allow equal packets from | |
1219 | * the same host however as this might be intended. | |
9cfc7bd6 | 1220 | */ |
56303d34 | 1221 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
96412690 | 1222 | struct batadv_bcast_packet *bcast_packet, |
08adf151 | 1223 | int hdr_size) |
fe2da6ff SW |
1224 | { |
1225 | int i, length, curr; | |
1226 | uint8_t *content; | |
1227 | uint16_t crc; | |
56303d34 | 1228 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff SW |
1229 | |
1230 | length = hdr_size - sizeof(*bcast_packet); | |
1231 | content = (uint8_t *)bcast_packet; | |
1232 | content += sizeof(*bcast_packet); | |
1233 | ||
1234 | /* calculate the crc ... */ | |
1235 | crc = crc16(0, content, length); | |
1236 | ||
42d0b044 SE |
1237 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
1238 | curr = (bat_priv->bcast_duplist_curr + i) % BATADV_DUPLIST_SIZE; | |
fe2da6ff SW |
1239 | entry = &bat_priv->bcast_duplist[curr]; |
1240 | ||
1241 | /* we can stop searching if the entry is too old ; | |
1242 | * later entries will be even older | |
1243 | */ | |
42d0b044 SE |
1244 | if (batadv_has_timed_out(entry->entrytime, |
1245 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1246 | break; |
1247 | ||
1248 | if (entry->crc != crc) | |
1249 | continue; | |
1250 | ||
1eda58bf | 1251 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1252 | continue; |
1253 | ||
1254 | /* this entry seems to match: same crc, not too old, | |
1255 | * and from another gw. therefore return 1 to forbid it. | |
1256 | */ | |
1257 | return 1; | |
1258 | } | |
1259 | /* not found, add a new entry (overwrite the oldest entry) */ | |
42d0b044 SE |
1260 | curr = (bat_priv->bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
1261 | curr %= BATADV_DUPLIST_SIZE; | |
fe2da6ff SW |
1262 | entry = &bat_priv->bcast_duplist[curr]; |
1263 | entry->crc = crc; | |
1264 | entry->entrytime = jiffies; | |
1265 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
1266 | bat_priv->bcast_duplist_curr = curr; | |
1267 | ||
1268 | /* allow it, its the first occurence. */ | |
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | ||
1273 | ||
9cfc7bd6 | 1274 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1275 | * @orig: originator mac address |
1276 | * | |
1277 | * check if the originator is a gateway for any VLAN ID. | |
1278 | * | |
1279 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1280 | */ |
56303d34 | 1281 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1282 | { |
5bf74e9c | 1283 | struct batadv_hashtable *hash = bat_priv->backbone_hash; |
20ff9d59 SW |
1284 | struct hlist_head *head; |
1285 | struct hlist_node *node; | |
56303d34 | 1286 | struct batadv_backbone_gw *backbone_gw; |
20ff9d59 SW |
1287 | int i; |
1288 | ||
1289 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1290 | return 0; | |
1291 | ||
1292 | if (!hash) | |
1293 | return 0; | |
1294 | ||
1295 | for (i = 0; i < hash->size; i++) { | |
1296 | head = &hash->table[i]; | |
1297 | ||
1298 | rcu_read_lock(); | |
1299 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1300 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1301 | rcu_read_unlock(); |
1302 | return 1; | |
1303 | } | |
1304 | } | |
1305 | rcu_read_unlock(); | |
1306 | } | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | ||
2c53040f BH |
1312 | /** |
1313 | * batadv_bla_is_backbone_gw | |
1314 | * @skb: the frame to be checked | |
23721387 SW |
1315 | * @orig_node: the orig_node of the frame |
1316 | * @hdr_size: maximum length of the frame | |
1317 | * | |
1318 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1319 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1320 | * returns 0. | |
23721387 | 1321 | */ |
08adf151 | 1322 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1323 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1324 | { |
1325 | struct ethhdr *ethhdr; | |
1326 | struct vlan_ethhdr *vhdr; | |
56303d34 | 1327 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1328 | short vid = -1; |
1329 | ||
1330 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1331 | return 0; | |
1332 | ||
1333 | /* first, find out the vid. */ | |
0d125074 | 1334 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1335 | return 0; |
1336 | ||
1337 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1338 | ||
1339 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1340 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1341 | return 0; | |
1342 | ||
1343 | vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) + | |
1344 | hdr_size); | |
1345 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1346 | } | |
1347 | ||
1348 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1349 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1350 | orig_node->orig, vid); | |
23721387 SW |
1351 | if (!backbone_gw) |
1352 | return 0; | |
1353 | ||
3b300de3 | 1354 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1355 | return 1; |
1356 | } | |
1357 | ||
1358 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1359 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1360 | { |
56303d34 | 1361 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1362 | |
1363 | cancel_delayed_work_sync(&bat_priv->bla_work); | |
e5d89254 | 1364 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1365 | |
1366 | if (bat_priv->claim_hash) { | |
3b300de3 | 1367 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
1a8eaf07 | 1368 | batadv_hash_destroy(bat_priv->claim_hash); |
23721387 SW |
1369 | bat_priv->claim_hash = NULL; |
1370 | } | |
1371 | if (bat_priv->backbone_hash) { | |
3b300de3 | 1372 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
1a8eaf07 | 1373 | batadv_hash_destroy(bat_priv->backbone_hash); |
23721387 SW |
1374 | bat_priv->backbone_hash = NULL; |
1375 | } | |
1376 | if (primary_if) | |
e5d89254 | 1377 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1378 | } |
1379 | ||
2c53040f BH |
1380 | /** |
1381 | * batadv_bla_rx | |
1382 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1383 | * @skb: the frame to be checked |
1384 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1385 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1386 | * |
1387 | * bla_rx avoidance checks if: | |
1388 | * * we have to race for a claim | |
1389 | * * if the frame is allowed on the LAN | |
1390 | * | |
1391 | * in these cases, the skb is further handled by this function and | |
1392 | * returns 1, otherwise it returns 0 and the caller shall further | |
1393 | * process the skb. | |
23721387 | 1394 | */ |
04c9f416 DM |
1395 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, |
1396 | bool is_bcast) | |
23721387 SW |
1397 | { |
1398 | struct ethhdr *ethhdr; | |
56303d34 SE |
1399 | struct batadv_claim search_claim, *claim = NULL; |
1400 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1401 | int ret; |
1402 | ||
1403 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1404 | ||
e5d89254 | 1405 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1406 | if (!primary_if) |
1407 | goto handled; | |
1408 | ||
1409 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1410 | goto allow; | |
1411 | ||
1412 | ||
1413 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1414 | /* don't allow broadcasts while requests are in flight */ | |
2d3f6ccc | 1415 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1416 | goto handled; |
1417 | ||
1418 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1419 | search_claim.vid = vid; | |
3b300de3 | 1420 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1421 | |
1422 | if (!claim) { | |
1423 | /* possible optimization: race for a claim */ | |
1424 | /* No claim exists yet, claim it for us! | |
1425 | */ | |
3b300de3 SE |
1426 | batadv_handle_claim(bat_priv, primary_if, |
1427 | primary_if->net_dev->dev_addr, | |
1428 | ethhdr->h_source, vid); | |
23721387 SW |
1429 | goto allow; |
1430 | } | |
1431 | ||
1432 | /* if it is our own claim ... */ | |
1eda58bf SE |
1433 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1434 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1435 | /* ... allow it in any case */ |
1436 | claim->lasttime = jiffies; | |
1437 | goto allow; | |
1438 | } | |
1439 | ||
1440 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1441 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1442 | /* ... drop it. the responsible gateway is in charge. | |
1443 | * | |
1444 | * We need to check is_bcast because with the gateway | |
1445 | * feature, broadcasts (like DHCP requests) may be sent | |
1446 | * using a unicast packet type. | |
1447 | */ | |
23721387 SW |
1448 | goto handled; |
1449 | } else { | |
1450 | /* seems the client considers us as its best gateway. | |
1451 | * send a claim and update the claim table | |
1452 | * immediately. | |
1453 | */ | |
3b300de3 SE |
1454 | batadv_handle_claim(bat_priv, primary_if, |
1455 | primary_if->net_dev->dev_addr, | |
1456 | ethhdr->h_source, vid); | |
23721387 SW |
1457 | goto allow; |
1458 | } | |
1459 | allow: | |
3b300de3 | 1460 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1461 | ret = 0; |
1462 | goto out; | |
1463 | ||
1464 | handled: | |
1465 | kfree_skb(skb); | |
1466 | ret = 1; | |
1467 | ||
1468 | out: | |
1469 | if (primary_if) | |
e5d89254 | 1470 | batadv_hardif_free_ref(primary_if); |
23721387 | 1471 | if (claim) |
3b300de3 | 1472 | batadv_claim_free_ref(claim); |
23721387 SW |
1473 | return ret; |
1474 | } | |
1475 | ||
2c53040f BH |
1476 | /** |
1477 | * batadv_bla_tx | |
1478 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1479 | * @skb: the frame to be checked |
1480 | * @vid: the VLAN ID of the frame | |
1481 | * | |
1482 | * bla_tx checks if: | |
1483 | * * a claim was received which has to be processed | |
1484 | * * the frame is allowed on the mesh | |
1485 | * | |
1486 | * in these cases, the skb is further handled by this function and | |
1487 | * returns 1, otherwise it returns 0 and the caller shall further | |
1488 | * process the skb. | |
23721387 | 1489 | */ |
56303d34 | 1490 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1491 | { |
1492 | struct ethhdr *ethhdr; | |
56303d34 SE |
1493 | struct batadv_claim search_claim, *claim = NULL; |
1494 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1495 | int ret = 0; |
1496 | ||
e5d89254 | 1497 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1498 | if (!primary_if) |
1499 | goto out; | |
1500 | ||
1501 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1502 | goto allow; | |
1503 | ||
1504 | /* in VLAN case, the mac header might not be set. */ | |
1505 | skb_reset_mac_header(skb); | |
1506 | ||
3b300de3 | 1507 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1508 | goto handled; |
1509 | ||
1510 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1511 | ||
1512 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1513 | /* don't allow broadcasts while requests are in flight */ | |
1514 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1515 | goto handled; | |
1516 | ||
1517 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1518 | search_claim.vid = vid; | |
1519 | ||
3b300de3 | 1520 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1521 | |
1522 | /* if no claim exists, allow it. */ | |
1523 | if (!claim) | |
1524 | goto allow; | |
1525 | ||
1526 | /* check if we are responsible. */ | |
1eda58bf SE |
1527 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1528 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1529 | /* if yes, the client has roamed and we have |
1530 | * to unclaim it. | |
1531 | */ | |
3b300de3 SE |
1532 | batadv_handle_unclaim(bat_priv, primary_if, |
1533 | primary_if->net_dev->dev_addr, | |
1534 | ethhdr->h_source, vid); | |
23721387 SW |
1535 | goto allow; |
1536 | } | |
1537 | ||
1538 | /* check if it is a multicast/broadcast frame */ | |
1539 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1540 | /* drop it. the responsible gateway has forwarded it into | |
1541 | * the backbone network. | |
1542 | */ | |
1543 | goto handled; | |
1544 | } else { | |
1545 | /* we must allow it. at least if we are | |
1546 | * responsible for the DESTINATION. | |
1547 | */ | |
1548 | goto allow; | |
1549 | } | |
1550 | allow: | |
3b300de3 | 1551 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1552 | ret = 0; |
1553 | goto out; | |
1554 | handled: | |
1555 | ret = 1; | |
1556 | out: | |
1557 | if (primary_if) | |
e5d89254 | 1558 | batadv_hardif_free_ref(primary_if); |
23721387 | 1559 | if (claim) |
3b300de3 | 1560 | batadv_claim_free_ref(claim); |
23721387 SW |
1561 | return ret; |
1562 | } | |
9bf8e4d4 | 1563 | |
08adf151 | 1564 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1565 | { |
1566 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1567 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
5bf74e9c | 1568 | struct batadv_hashtable *hash = bat_priv->claim_hash; |
56303d34 SE |
1569 | struct batadv_claim *claim; |
1570 | struct batadv_hard_iface *primary_if; | |
9bf8e4d4 SW |
1571 | struct hlist_node *node; |
1572 | struct hlist_head *head; | |
1573 | uint32_t i; | |
1574 | bool is_own; | |
1575 | int ret = 0; | |
1eda58bf | 1576 | uint8_t *primary_addr; |
9bf8e4d4 | 1577 | |
e5d89254 | 1578 | primary_if = batadv_primary_if_get_selected(bat_priv); |
9bf8e4d4 SW |
1579 | if (!primary_if) { |
1580 | ret = seq_printf(seq, | |
1581 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1582 | net_dev->name); | |
1583 | goto out; | |
1584 | } | |
1585 | ||
e9a4f295 | 1586 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
9bf8e4d4 SW |
1587 | ret = seq_printf(seq, |
1588 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1589 | net_dev->name); | |
1590 | goto out; | |
1591 | } | |
1592 | ||
1eda58bf | 1593 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d SW |
1594 | seq_printf(seq, |
1595 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1eda58bf | 1596 | net_dev->name, primary_addr, |
38ef3d1d | 1597 | ntohs(bat_priv->claim_dest.group)); |
9bf8e4d4 SW |
1598 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1599 | "Client", "VID", "Originator", "CRC"); | |
1600 | for (i = 0; i < hash->size; i++) { | |
1601 | head = &hash->table[i]; | |
1602 | ||
1603 | rcu_read_lock(); | |
1604 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1605 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1606 | primary_addr); | |
9bf8e4d4 SW |
1607 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", |
1608 | claim->addr, claim->vid, | |
1609 | claim->backbone_gw->orig, | |
1610 | (is_own ? 'x' : ' '), | |
1611 | claim->backbone_gw->crc); | |
1612 | } | |
1613 | rcu_read_unlock(); | |
1614 | } | |
1615 | out: | |
1616 | if (primary_if) | |
e5d89254 | 1617 | batadv_hardif_free_ref(primary_if); |
9bf8e4d4 SW |
1618 | return ret; |
1619 | } | |
536a23f1 SW |
1620 | |
1621 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1622 | { | |
1623 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1624 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1625 | struct batadv_hashtable *hash = bat_priv->backbone_hash; | |
1626 | struct batadv_backbone_gw *backbone_gw; | |
1627 | struct batadv_hard_iface *primary_if; | |
1628 | struct hlist_node *node; | |
1629 | struct hlist_head *head; | |
1630 | int secs, msecs; | |
1631 | uint32_t i; | |
1632 | bool is_own; | |
1633 | int ret = 0; | |
1634 | uint8_t *primary_addr; | |
1635 | ||
1636 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1637 | if (!primary_if) { | |
1638 | ret = seq_printf(seq, | |
1639 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1640 | net_dev->name); | |
1641 | goto out; | |
1642 | } | |
1643 | ||
1644 | if (primary_if->if_status != BATADV_IF_ACTIVE) { | |
1645 | ret = seq_printf(seq, | |
1646 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1647 | net_dev->name); | |
1648 | goto out; | |
1649 | } | |
1650 | ||
1651 | primary_addr = primary_if->net_dev->dev_addr; | |
1652 | seq_printf(seq, | |
1653 | "Backbones announced for the mesh %s (orig %pM, group id %04x)\n", | |
1654 | net_dev->name, primary_addr, | |
1655 | ntohs(bat_priv->claim_dest.group)); | |
1656 | seq_printf(seq, " %-17s %-5s %-9s (%-4s)\n", | |
1657 | "Originator", "VID", "last seen", "CRC"); | |
1658 | for (i = 0; i < hash->size; i++) { | |
1659 | head = &hash->table[i]; | |
1660 | ||
1661 | rcu_read_lock(); | |
1662 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1663 | msecs = jiffies_to_msecs(jiffies - | |
1664 | backbone_gw->lasttime); | |
1665 | secs = msecs / 1000; | |
1666 | msecs = msecs % 1000; | |
1667 | ||
1668 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1669 | primary_addr); | |
1670 | if (is_own) | |
1671 | continue; | |
1672 | ||
1673 | seq_printf(seq, | |
1674 | " * %pM on % 5d % 4i.%03is (%04x)\n", | |
1675 | backbone_gw->orig, backbone_gw->vid, | |
1676 | secs, msecs, backbone_gw->crc); | |
1677 | } | |
1678 | rcu_read_unlock(); | |
1679 | } | |
1680 | out: | |
1681 | if (primary_if) | |
1682 | batadv_hardif_free_ref(primary_if); | |
1683 | return ret; | |
1684 | } |