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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 | 42 | { |
07568d03 | 43 | struct batadv_claim *claim = (struct batadv_claim *)data; |
23721387 | 44 | uint32_t hash = 0; |
23721387 | 45 | |
07568d03 SW |
46 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
47 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
48 | |
49 | hash += (hash << 3); | |
50 | hash ^= (hash >> 11); | |
51 | hash += (hash << 15); | |
52 | ||
53 | return hash % size; | |
54 | } | |
55 | ||
56 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
57 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
58 | uint32_t size) | |
23721387 | 59 | { |
467b5fe6 | 60 | const struct batadv_claim *claim = (struct batadv_claim *)data; |
23721387 | 61 | uint32_t hash = 0; |
23721387 | 62 | |
07568d03 SW |
63 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
64 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
65 | |
66 | hash += (hash << 3); | |
67 | hash ^= (hash >> 11); | |
68 | hash += (hash << 15); | |
69 | ||
70 | return hash % size; | |
71 | } | |
72 | ||
73 | ||
74 | /* compares address and vid of two backbone gws */ | |
3b300de3 SE |
75 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
76 | const void *data2) | |
23721387 | 77 | { |
56303d34 | 78 | const void *data1 = container_of(node, struct batadv_backbone_gw, |
23721387 | 79 | hash_entry); |
c76d1525 | 80 | const struct batadv_backbone_gw *gw1 = data1, *gw2 = data2; |
23721387 | 81 | |
c76d1525 SW |
82 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
83 | return 0; | |
84 | ||
85 | if (gw1->vid != gw2->vid) | |
86 | return 0; | |
87 | ||
88 | return 1; | |
23721387 SW |
89 | } |
90 | ||
91 | /* compares address and vid of two claims */ | |
3b300de3 SE |
92 | static int batadv_compare_claim(const struct hlist_node *node, |
93 | const void *data2) | |
23721387 | 94 | { |
56303d34 | 95 | const void *data1 = container_of(node, struct batadv_claim, |
23721387 | 96 | hash_entry); |
c76d1525 SW |
97 | const struct batadv_claim *cl1 = data1, *cl2 = data2; |
98 | ||
99 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
100 | return 0; | |
101 | ||
102 | if (cl1->vid != cl2->vid) | |
103 | return 0; | |
23721387 | 104 | |
c76d1525 | 105 | return 1; |
23721387 SW |
106 | } |
107 | ||
108 | /* free a backbone gw */ | |
56303d34 | 109 | static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
110 | { |
111 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
112 | kfree_rcu(backbone_gw, rcu); | |
113 | } | |
114 | ||
115 | /* finally deinitialize the claim */ | |
3b300de3 | 116 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 117 | { |
56303d34 | 118 | struct batadv_claim *claim; |
23721387 | 119 | |
56303d34 | 120 | claim = container_of(rcu, struct batadv_claim, rcu); |
23721387 | 121 | |
3b300de3 | 122 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
123 | kfree(claim); |
124 | } | |
125 | ||
126 | /* free a claim, call claim_free_rcu if its the last reference */ | |
56303d34 | 127 | static void batadv_claim_free_ref(struct batadv_claim *claim) |
23721387 SW |
128 | { |
129 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 130 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
131 | } |
132 | ||
9cfc7bd6 | 133 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
134 | * @data: search data (may be local/static data) |
135 | * | |
136 | * looks for a claim in the hash, and returns it if found | |
137 | * or NULL otherwise. | |
138 | */ | |
56303d34 SE |
139 | static struct batadv_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv, |
140 | struct batadv_claim *data) | |
23721387 | 141 | { |
807736f6 | 142 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 SW |
143 | struct hlist_head *head; |
144 | struct hlist_node *node; | |
56303d34 SE |
145 | struct batadv_claim *claim; |
146 | struct batadv_claim *claim_tmp = NULL; | |
23721387 SW |
147 | int index; |
148 | ||
149 | if (!hash) | |
150 | return NULL; | |
151 | ||
3b300de3 | 152 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
153 | head = &hash->table[index]; |
154 | ||
155 | rcu_read_lock(); | |
156 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
3b300de3 | 157 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
158 | continue; |
159 | ||
160 | if (!atomic_inc_not_zero(&claim->refcount)) | |
161 | continue; | |
162 | ||
163 | claim_tmp = claim; | |
164 | break; | |
165 | } | |
166 | rcu_read_unlock(); | |
167 | ||
168 | return claim_tmp; | |
169 | } | |
170 | ||
2c53040f BH |
171 | /** |
172 | * batadv_backbone_hash_find - looks for a claim in the hash | |
173 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
174 | * @addr: the address of the originator |
175 | * @vid: the VLAN ID | |
176 | * | |
2c53040f | 177 | * Returns claim if found or NULL otherwise. |
23721387 | 178 | */ |
56303d34 SE |
179 | static struct batadv_backbone_gw * |
180 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, | |
181 | uint8_t *addr, short vid) | |
23721387 | 182 | { |
807736f6 | 183 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 SW |
184 | struct hlist_head *head; |
185 | struct hlist_node *node; | |
56303d34 SE |
186 | struct batadv_backbone_gw search_entry, *backbone_gw; |
187 | struct batadv_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
188 | int index; |
189 | ||
190 | if (!hash) | |
191 | return NULL; | |
192 | ||
193 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
194 | search_entry.vid = vid; | |
195 | ||
3b300de3 | 196 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
197 | head = &hash->table[index]; |
198 | ||
199 | rcu_read_lock(); | |
200 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
3b300de3 SE |
201 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
202 | &search_entry)) | |
23721387 SW |
203 | continue; |
204 | ||
205 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
206 | continue; | |
207 | ||
208 | backbone_gw_tmp = backbone_gw; | |
209 | break; | |
210 | } | |
211 | rcu_read_unlock(); | |
212 | ||
213 | return backbone_gw_tmp; | |
214 | } | |
215 | ||
216 | /* delete all claims for a backbone */ | |
56303d34 SE |
217 | static void |
218 | batadv_bla_del_backbone_claims(struct batadv_backbone_gw *backbone_gw) | |
23721387 | 219 | { |
5bf74e9c | 220 | struct batadv_hashtable *hash; |
23721387 SW |
221 | struct hlist_node *node, *node_tmp; |
222 | struct hlist_head *head; | |
56303d34 | 223 | struct batadv_claim *claim; |
23721387 SW |
224 | int i; |
225 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
226 | ||
807736f6 | 227 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
228 | if (!hash) |
229 | return; | |
230 | ||
231 | for (i = 0; i < hash->size; i++) { | |
232 | head = &hash->table[i]; | |
233 | list_lock = &hash->list_locks[i]; | |
234 | ||
235 | spin_lock_bh(list_lock); | |
236 | hlist_for_each_entry_safe(claim, node, node_tmp, | |
237 | head, hash_entry) { | |
23721387 SW |
238 | if (claim->backbone_gw != backbone_gw) |
239 | continue; | |
240 | ||
3b300de3 | 241 | batadv_claim_free_ref(claim); |
23721387 SW |
242 | hlist_del_rcu(node); |
243 | } | |
244 | spin_unlock_bh(list_lock); | |
245 | } | |
246 | ||
247 | /* all claims gone, intialize CRC */ | |
3964f728 | 248 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
249 | } |
250 | ||
2c53040f BH |
251 | /** |
252 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
253 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
254 | * @orig: the mac address to be announced within the claim |
255 | * @vid: the VLAN ID | |
256 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 257 | */ |
56303d34 | 258 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
3b300de3 | 259 | short vid, int claimtype) |
23721387 SW |
260 | { |
261 | struct sk_buff *skb; | |
262 | struct ethhdr *ethhdr; | |
56303d34 | 263 | struct batadv_hard_iface *primary_if; |
23721387 SW |
264 | struct net_device *soft_iface; |
265 | uint8_t *hw_src; | |
96412690 | 266 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 267 | __be32 zeroip = 0; |
23721387 | 268 | |
e5d89254 | 269 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
270 | if (!primary_if) |
271 | return; | |
272 | ||
807736f6 | 273 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 274 | sizeof(local_claim_dest)); |
23721387 SW |
275 | local_claim_dest.type = claimtype; |
276 | ||
277 | soft_iface = primary_if->soft_iface; | |
278 | ||
279 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
280 | /* IP DST: 0.0.0.0 */ | |
281 | zeroip, | |
282 | primary_if->soft_iface, | |
283 | /* IP SRC: 0.0.0.0 */ | |
284 | zeroip, | |
285 | /* Ethernet DST: Broadcast */ | |
286 | NULL, | |
287 | /* Ethernet SRC/HW SRC: originator mac */ | |
288 | primary_if->net_dev->dev_addr, | |
99e966fc | 289 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 290 | * with XX = claim type |
38ef3d1d | 291 | * and YY:YY = group id |
23721387 SW |
292 | */ |
293 | (uint8_t *)&local_claim_dest); | |
294 | ||
295 | if (!skb) | |
296 | goto out; | |
297 | ||
298 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 299 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
300 | |
301 | /* now we pretend that the client would have sent this ... */ | |
302 | switch (claimtype) { | |
3eb8773e | 303 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
304 | /* normal claim frame |
305 | * set Ethernet SRC to the clients mac | |
306 | */ | |
307 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
39c75a51 | 308 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 309 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); |
23721387 | 310 | break; |
3eb8773e | 311 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
312 | /* unclaim frame |
313 | * set HW SRC to the clients mac | |
314 | */ | |
315 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 316 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
317 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
318 | vid); | |
23721387 | 319 | break; |
acd34afa | 320 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
321 | /* announcement frame |
322 | * set HW SRC to the special mac containg the crc | |
323 | */ | |
324 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 325 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
326 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
327 | ethhdr->h_source, vid); | |
23721387 | 328 | break; |
acd34afa | 329 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 330 | /* request frame |
99e966fc SW |
331 | * set HW SRC and header destination to the receiving backbone |
332 | * gws mac | |
23721387 SW |
333 | */ |
334 | memcpy(hw_src, mac, ETH_ALEN); | |
335 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 336 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
337 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", |
338 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 | 339 | break; |
23721387 SW |
340 | } |
341 | ||
342 | if (vid != -1) | |
343 | skb = vlan_insert_tag(skb, vid); | |
344 | ||
345 | skb_reset_mac_header(skb); | |
346 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
347 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
348 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
349 | skb->len + ETH_HLEN); | |
23721387 SW |
350 | soft_iface->last_rx = jiffies; |
351 | ||
352 | netif_rx(skb); | |
353 | out: | |
354 | if (primary_if) | |
e5d89254 | 355 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
356 | } |
357 | ||
2c53040f BH |
358 | /** |
359 | * batadv_bla_get_backbone_gw | |
360 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
361 | * @orig: the mac address of the originator |
362 | * @vid: the VLAN ID | |
363 | * | |
364 | * searches for the backbone gw or creates a new one if it could not | |
365 | * be found. | |
366 | */ | |
56303d34 SE |
367 | static struct batadv_backbone_gw * |
368 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, | |
52aebd6a | 369 | short vid, bool own_backbone) |
23721387 | 370 | { |
56303d34 SE |
371 | struct batadv_backbone_gw *entry; |
372 | struct batadv_orig_node *orig_node; | |
23721387 SW |
373 | int hash_added; |
374 | ||
3b300de3 | 375 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
376 | |
377 | if (entry) | |
378 | return entry; | |
379 | ||
39c75a51 | 380 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
381 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
382 | orig, vid); | |
23721387 SW |
383 | |
384 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
385 | if (!entry) | |
386 | return NULL; | |
387 | ||
388 | entry->vid = vid; | |
389 | entry->lasttime = jiffies; | |
3964f728 | 390 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
391 | entry->bat_priv = bat_priv; |
392 | atomic_set(&entry->request_sent, 0); | |
28709878 | 393 | atomic_set(&entry->wait_periods, 0); |
23721387 SW |
394 | memcpy(entry->orig, orig, ETH_ALEN); |
395 | ||
396 | /* one for the hash, one for returning */ | |
397 | atomic_set(&entry->refcount, 2); | |
398 | ||
807736f6 | 399 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
400 | batadv_compare_backbone_gw, |
401 | batadv_choose_backbone_gw, entry, | |
402 | &entry->hash_entry); | |
23721387 SW |
403 | |
404 | if (unlikely(hash_added != 0)) { | |
405 | /* hash failed, free the structure */ | |
406 | kfree(entry); | |
407 | return NULL; | |
408 | } | |
409 | ||
20ff9d59 | 410 | /* this is a gateway now, remove any tt entries */ |
da641193 | 411 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 412 | if (orig_node) { |
08c36d3e SE |
413 | batadv_tt_global_del_orig(bat_priv, orig_node, |
414 | "became a backbone gateway"); | |
7d211efc | 415 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 416 | } |
52aebd6a | 417 | |
d807f272 | 418 | if (own_backbone) { |
52aebd6a SW |
419 | batadv_bla_send_announce(bat_priv, entry); |
420 | ||
d807f272 SW |
421 | /* this will be decreased in the worker thread */ |
422 | atomic_inc(&entry->request_sent); | |
28709878 | 423 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
424 | atomic_inc(&bat_priv->bla.num_requests); |
425 | } | |
426 | ||
23721387 SW |
427 | return entry; |
428 | } | |
429 | ||
430 | /* update or add the own backbone gw to make sure we announce | |
431 | * where we receive other backbone gws | |
432 | */ | |
56303d34 SE |
433 | static void |
434 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
435 | struct batadv_hard_iface *primary_if, | |
436 | short vid) | |
23721387 | 437 | { |
56303d34 | 438 | struct batadv_backbone_gw *backbone_gw; |
23721387 | 439 | |
3b300de3 SE |
440 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
441 | primary_if->net_dev->dev_addr, | |
52aebd6a | 442 | vid, true); |
23721387 SW |
443 | if (unlikely(!backbone_gw)) |
444 | return; | |
445 | ||
446 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 447 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
448 | } |
449 | ||
9cfc7bd6 | 450 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
451 | * @vid: the vid where the request came on |
452 | * | |
453 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
454 | * to allow the requester another check if the CRC is correct now. | |
455 | */ | |
56303d34 SE |
456 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
457 | struct batadv_hard_iface *primary_if, | |
458 | short vid) | |
23721387 SW |
459 | { |
460 | struct hlist_node *node; | |
461 | struct hlist_head *head; | |
5bf74e9c | 462 | struct batadv_hashtable *hash; |
56303d34 SE |
463 | struct batadv_claim *claim; |
464 | struct batadv_backbone_gw *backbone_gw; | |
23721387 SW |
465 | int i; |
466 | ||
39c75a51 | 467 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 468 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 469 | |
3b300de3 SE |
470 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
471 | primary_if->net_dev->dev_addr, | |
472 | vid); | |
23721387 SW |
473 | if (!backbone_gw) |
474 | return; | |
475 | ||
807736f6 | 476 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
477 | for (i = 0; i < hash->size; i++) { |
478 | head = &hash->table[i]; | |
479 | ||
480 | rcu_read_lock(); | |
481 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
482 | /* only own claims are interesting */ | |
483 | if (claim->backbone_gw != backbone_gw) | |
484 | continue; | |
485 | ||
3b300de3 | 486 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 487 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
488 | } |
489 | rcu_read_unlock(); | |
490 | } | |
491 | ||
492 | /* finally, send an announcement frame */ | |
3b300de3 SE |
493 | batadv_bla_send_announce(bat_priv, backbone_gw); |
494 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
495 | } |
496 | ||
9cfc7bd6 | 497 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
498 | * |
499 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
500 | * After the request, it will repeat all of his own claims and finally | |
501 | * send an announcement claim with which we can check again. | |
502 | */ | |
56303d34 | 503 | static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
504 | { |
505 | /* first, remove all old entries */ | |
3b300de3 | 506 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 507 | |
39c75a51 SE |
508 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
509 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
510 | |
511 | /* send request */ | |
3b300de3 | 512 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 513 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
514 | |
515 | /* no local broadcasts should be sent or received, for now. */ | |
516 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 517 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
518 | atomic_set(&backbone_gw->request_sent, 1); |
519 | } | |
520 | } | |
521 | ||
9cfc7bd6 | 522 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
523 | * @backbone_gw: our backbone gateway which should be announced |
524 | * | |
525 | * This function sends an announcement. It is called from multiple | |
526 | * places. | |
527 | */ | |
56303d34 SE |
528 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
529 | struct batadv_backbone_gw *backbone_gw) | |
23721387 SW |
530 | { |
531 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 532 | __be16 crc; |
23721387 | 533 | |
3b300de3 | 534 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 535 | crc = htons(backbone_gw->crc); |
1a5852d8 | 536 | memcpy(&mac[4], &crc, 2); |
23721387 | 537 | |
3b300de3 | 538 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 539 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
540 | } |
541 | ||
2c53040f BH |
542 | /** |
543 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
544 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
545 | * @mac: the mac address of the claim |
546 | * @vid: the VLAN ID of the frame | |
547 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 548 | */ |
56303d34 SE |
549 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
550 | const uint8_t *mac, const short vid, | |
551 | struct batadv_backbone_gw *backbone_gw) | |
23721387 | 552 | { |
56303d34 SE |
553 | struct batadv_claim *claim; |
554 | struct batadv_claim search_claim; | |
23721387 SW |
555 | int hash_added; |
556 | ||
557 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
558 | search_claim.vid = vid; | |
3b300de3 | 559 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
560 | |
561 | /* create a new claim entry if it does not exist yet. */ | |
562 | if (!claim) { | |
563 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
564 | if (!claim) | |
565 | return; | |
566 | ||
567 | memcpy(claim->addr, mac, ETH_ALEN); | |
568 | claim->vid = vid; | |
569 | claim->lasttime = jiffies; | |
570 | claim->backbone_gw = backbone_gw; | |
571 | ||
572 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 573 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
574 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
575 | mac, vid); | |
807736f6 | 576 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
577 | batadv_compare_claim, |
578 | batadv_choose_claim, claim, | |
579 | &claim->hash_entry); | |
23721387 SW |
580 | |
581 | if (unlikely(hash_added != 0)) { | |
582 | /* only local changes happened. */ | |
583 | kfree(claim); | |
584 | return; | |
585 | } | |
586 | } else { | |
587 | claim->lasttime = jiffies; | |
588 | if (claim->backbone_gw == backbone_gw) | |
589 | /* no need to register a new backbone */ | |
590 | goto claim_free_ref; | |
591 | ||
39c75a51 | 592 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
593 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
594 | mac, vid); | |
23721387 | 595 | |
bbb1f90e | 596 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 597 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
598 | } |
599 | /* set (new) backbone gw */ | |
600 | atomic_inc(&backbone_gw->refcount); | |
601 | claim->backbone_gw = backbone_gw; | |
602 | ||
603 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
604 | backbone_gw->lasttime = jiffies; | |
605 | ||
606 | claim_free_ref: | |
3b300de3 | 607 | batadv_claim_free_ref(claim); |
23721387 SW |
608 | } |
609 | ||
610 | /* Delete a claim from the claim hash which has the | |
611 | * given mac address and vid. | |
612 | */ | |
56303d34 SE |
613 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
614 | const uint8_t *mac, const short vid) | |
23721387 | 615 | { |
56303d34 | 616 | struct batadv_claim search_claim, *claim; |
23721387 SW |
617 | |
618 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
619 | search_claim.vid = vid; | |
3b300de3 | 620 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
621 | if (!claim) |
622 | return; | |
623 | ||
39c75a51 SE |
624 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
625 | mac, vid); | |
23721387 | 626 | |
807736f6 | 627 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
628 | batadv_choose_claim, claim); |
629 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
630 | |
631 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
632 | ||
633 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 634 | batadv_claim_free_ref(claim); |
23721387 SW |
635 | } |
636 | ||
637 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 638 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
639 | uint8_t *an_addr, uint8_t *backbone_addr, |
640 | short vid) | |
23721387 | 641 | { |
56303d34 | 642 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
643 | uint16_t crc; |
644 | ||
3b300de3 | 645 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
646 | return 0; |
647 | ||
52aebd6a SW |
648 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
649 | false); | |
23721387 SW |
650 | |
651 | if (unlikely(!backbone_gw)) | |
652 | return 1; | |
653 | ||
654 | ||
655 | /* handle as ANNOUNCE frame */ | |
656 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 657 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 658 | |
39c75a51 | 659 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 660 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
1eda58bf | 661 | vid, backbone_gw->orig, crc); |
23721387 SW |
662 | |
663 | if (backbone_gw->crc != crc) { | |
39c75a51 | 664 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 665 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
1eda58bf SE |
666 | backbone_gw->orig, backbone_gw->vid, |
667 | backbone_gw->crc, crc); | |
23721387 | 668 | |
3b300de3 | 669 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
670 | } else { |
671 | /* if we have sent a request and the crc was OK, | |
672 | * we can allow traffic again. | |
673 | */ | |
674 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 675 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
676 | atomic_set(&backbone_gw->request_sent, 0); |
677 | } | |
678 | } | |
679 | ||
3b300de3 | 680 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
681 | return 1; |
682 | } | |
683 | ||
684 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
685 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
686 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
687 | uint8_t *backbone_addr, |
688 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
689 | { |
690 | /* check for REQUEST frame */ | |
1eda58bf | 691 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
692 | return 0; |
693 | ||
694 | /* sanity check, this should not happen on a normal switch, | |
695 | * we ignore it in this case. | |
696 | */ | |
1eda58bf | 697 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
698 | return 1; |
699 | ||
39c75a51 | 700 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
701 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
702 | vid, ethhdr->h_source); | |
23721387 | 703 | |
3b300de3 | 704 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
705 | return 1; |
706 | } | |
707 | ||
708 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
709 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
710 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
711 | uint8_t *backbone_addr, |
712 | uint8_t *claim_addr, short vid) | |
23721387 | 713 | { |
56303d34 | 714 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
715 | |
716 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
717 | if (primary_if && batadv_compare_eth(backbone_addr, |
718 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 719 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 720 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 721 | |
3b300de3 | 722 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
723 | |
724 | if (!backbone_gw) | |
725 | return 1; | |
726 | ||
727 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 728 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
729 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
730 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 731 | |
3b300de3 SE |
732 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
733 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
734 | return 1; |
735 | } | |
736 | ||
737 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
738 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
739 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
740 | uint8_t *backbone_addr, uint8_t *claim_addr, |
741 | short vid) | |
23721387 | 742 | { |
56303d34 | 743 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
744 | |
745 | /* register the gateway if not yet available, and add the claim. */ | |
746 | ||
52aebd6a SW |
747 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
748 | false); | |
23721387 SW |
749 | |
750 | if (unlikely(!backbone_gw)) | |
751 | return 1; | |
752 | ||
753 | /* this must be a CLAIM frame */ | |
3b300de3 | 754 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 755 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 756 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 757 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
758 | |
759 | /* TODO: we could call something like tt_local_del() here. */ | |
760 | ||
3b300de3 | 761 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
762 | return 1; |
763 | } | |
764 | ||
2c53040f BH |
765 | /** |
766 | * batadv_check_claim_group | |
767 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
768 | * @hw_src: the Hardware source in the ARP Header |
769 | * @hw_dst: the Hardware destination in the ARP Header | |
770 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
771 | * | |
772 | * checks if it is a claim packet and if its on the same group. | |
773 | * This function also applies the group ID of the sender | |
774 | * if it is in the same mesh. | |
775 | * | |
776 | * returns: | |
777 | * 2 - if it is a claim packet and on the same group | |
778 | * 1 - if is a claim packet from another group | |
779 | * 0 - if it is not a claim packet | |
780 | */ | |
56303d34 SE |
781 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
782 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
783 | uint8_t *hw_src, uint8_t *hw_dst, |
784 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
785 | { |
786 | uint8_t *backbone_addr; | |
56303d34 | 787 | struct batadv_orig_node *orig_node; |
96412690 | 788 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 789 | |
96412690 | 790 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 791 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d SW |
792 | |
793 | /* check if it is a claim packet in general */ | |
794 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
795 | sizeof(bla_dst->magic)) != 0) | |
796 | return 0; | |
797 | ||
798 | /* if announcement packet, use the source, | |
799 | * otherwise assume it is in the hw_src | |
800 | */ | |
801 | switch (bla_dst->type) { | |
3eb8773e | 802 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
803 | backbone_addr = hw_src; |
804 | break; | |
acd34afa SE |
805 | case BATADV_CLAIM_TYPE_REQUEST: |
806 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 807 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
808 | backbone_addr = ethhdr->h_source; |
809 | break; | |
810 | default: | |
811 | return 0; | |
812 | } | |
813 | ||
814 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 815 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
816 | return 0; |
817 | ||
818 | /* if its already the same group, it is fine. */ | |
819 | if (bla_dst->group == bla_dst_own->group) | |
820 | return 2; | |
821 | ||
822 | /* lets see if this originator is in our mesh */ | |
da641193 | 823 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
824 | |
825 | /* dont accept claims from gateways which are not in | |
826 | * the same mesh or group. | |
827 | */ | |
828 | if (!orig_node) | |
829 | return 1; | |
830 | ||
831 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
832 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 833 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 834 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 835 | ntohs(bla_dst->group)); |
38ef3d1d SW |
836 | bla_dst_own->group = bla_dst->group; |
837 | } | |
838 | ||
7d211efc | 839 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
840 | |
841 | return 2; | |
842 | } | |
843 | ||
844 | ||
9cfc7bd6 | 845 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
846 | * @skb: the frame to be checked |
847 | * | |
848 | * Check if this is a claim frame, and process it accordingly. | |
849 | * | |
850 | * returns 1 if it was a claim frame, otherwise return 0 to | |
851 | * tell the callee that it can use the frame on its own. | |
852 | */ | |
56303d34 SE |
853 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
854 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 855 | struct sk_buff *skb) |
23721387 SW |
856 | { |
857 | struct ethhdr *ethhdr; | |
858 | struct vlan_ethhdr *vhdr; | |
859 | struct arphdr *arphdr; | |
860 | uint8_t *hw_src, *hw_dst; | |
96412690 | 861 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
862 | uint16_t proto; |
863 | int headlen; | |
864 | short vid = -1; | |
38ef3d1d | 865 | int ret; |
23721387 SW |
866 | |
867 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
868 | ||
869 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
870 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
871 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
872 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
873 | headlen = sizeof(*vhdr); | |
874 | } else { | |
875 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 876 | headlen = ETH_HLEN; |
23721387 SW |
877 | } |
878 | ||
879 | if (proto != ETH_P_ARP) | |
880 | return 0; /* not a claim frame */ | |
881 | ||
882 | /* this must be a ARP frame. check if it is a claim. */ | |
883 | ||
884 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
885 | return 0; | |
886 | ||
887 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
888 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
889 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
890 | ||
891 | /* Check whether the ARP frame carries a valid | |
892 | * IP information | |
893 | */ | |
23721387 SW |
894 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
895 | return 0; | |
896 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
897 | return 0; | |
898 | if (arphdr->ar_hln != ETH_ALEN) | |
899 | return 0; | |
900 | if (arphdr->ar_pln != 4) | |
901 | return 0; | |
902 | ||
903 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
904 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 905 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
906 | |
907 | /* check if it is a claim frame. */ | |
3b300de3 SE |
908 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
909 | ethhdr); | |
38ef3d1d | 910 | if (ret == 1) |
39c75a51 | 911 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
912 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
913 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
914 | |
915 | if (ret < 2) | |
916 | return ret; | |
23721387 SW |
917 | |
918 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 919 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
920 | |
921 | /* check for the different types of claim frames ... */ | |
922 | switch (bla_dst->type) { | |
3eb8773e | 923 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
924 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
925 | ethhdr->h_source, vid)) | |
23721387 SW |
926 | return 1; |
927 | break; | |
3eb8773e | 928 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
929 | if (batadv_handle_unclaim(bat_priv, primary_if, |
930 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
931 | return 1; |
932 | break; | |
933 | ||
acd34afa | 934 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
935 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
936 | vid)) | |
23721387 SW |
937 | return 1; |
938 | break; | |
acd34afa | 939 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
940 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
941 | vid)) | |
23721387 SW |
942 | return 1; |
943 | break; | |
944 | } | |
945 | ||
39c75a51 | 946 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
947 | "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", |
948 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
949 | return 1; |
950 | } | |
951 | ||
952 | /* Check when we last heard from other nodes, and remove them in case of | |
953 | * a time out, or clean all backbone gws if now is set. | |
954 | */ | |
56303d34 | 955 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 956 | { |
56303d34 | 957 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
958 | struct hlist_node *node, *node_tmp; |
959 | struct hlist_head *head; | |
5bf74e9c | 960 | struct batadv_hashtable *hash; |
23721387 SW |
961 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
962 | int i; | |
963 | ||
807736f6 | 964 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
965 | if (!hash) |
966 | return; | |
967 | ||
968 | for (i = 0; i < hash->size; i++) { | |
969 | head = &hash->table[i]; | |
970 | list_lock = &hash->list_locks[i]; | |
971 | ||
972 | spin_lock_bh(list_lock); | |
973 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
974 | head, hash_entry) { | |
975 | if (now) | |
976 | goto purge_now; | |
1eda58bf | 977 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 978 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
979 | continue; |
980 | ||
39c75a51 | 981 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
982 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
983 | backbone_gw->orig); | |
23721387 SW |
984 | |
985 | purge_now: | |
986 | /* don't wait for the pending request anymore */ | |
987 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 988 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 989 | |
3b300de3 | 990 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
991 | |
992 | hlist_del_rcu(node); | |
3b300de3 | 993 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
994 | } |
995 | spin_unlock_bh(list_lock); | |
996 | } | |
997 | } | |
998 | ||
2c53040f BH |
999 | /** |
1000 | * batadv_bla_purge_claims | |
1001 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1002 | * @primary_if: the selected primary interface, may be NULL if now is set |
1003 | * @now: whether the whole hash shall be wiped now | |
1004 | * | |
1005 | * Check when we heard last time from our own claims, and remove them in case of | |
1006 | * a time out, or clean all claims if now is set | |
1007 | */ | |
56303d34 SE |
1008 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1009 | struct batadv_hard_iface *primary_if, | |
1010 | int now) | |
23721387 | 1011 | { |
56303d34 | 1012 | struct batadv_claim *claim; |
23721387 SW |
1013 | struct hlist_node *node; |
1014 | struct hlist_head *head; | |
5bf74e9c | 1015 | struct batadv_hashtable *hash; |
23721387 SW |
1016 | int i; |
1017 | ||
807736f6 | 1018 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1019 | if (!hash) |
1020 | return; | |
1021 | ||
1022 | for (i = 0; i < hash->size; i++) { | |
1023 | head = &hash->table[i]; | |
1024 | ||
1025 | rcu_read_lock(); | |
1026 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1027 | if (now) | |
1028 | goto purge_now; | |
1eda58bf SE |
1029 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1030 | primary_if->net_dev->dev_addr)) | |
23721387 | 1031 | continue; |
1eda58bf | 1032 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1033 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1034 | continue; |
1035 | ||
39c75a51 | 1036 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1037 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1038 | claim->addr, claim->vid); | |
23721387 SW |
1039 | |
1040 | purge_now: | |
3b300de3 SE |
1041 | batadv_handle_unclaim(bat_priv, primary_if, |
1042 | claim->backbone_gw->orig, | |
1043 | claim->addr, claim->vid); | |
23721387 SW |
1044 | } |
1045 | rcu_read_unlock(); | |
1046 | } | |
1047 | } | |
1048 | ||
2c53040f BH |
1049 | /** |
1050 | * batadv_bla_update_orig_address | |
1051 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1052 | * @primary_if: the new selected primary_if |
1053 | * @oldif: the old primary interface, may be NULL | |
1054 | * | |
1055 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1056 | */ |
56303d34 SE |
1057 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1058 | struct batadv_hard_iface *primary_if, | |
1059 | struct batadv_hard_iface *oldif) | |
23721387 | 1060 | { |
56303d34 | 1061 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1062 | struct hlist_node *node; |
1063 | struct hlist_head *head; | |
5bf74e9c | 1064 | struct batadv_hashtable *hash; |
807736f6 | 1065 | __be16 group; |
23721387 SW |
1066 | int i; |
1067 | ||
38ef3d1d | 1068 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1069 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1070 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1071 | |
23721387 | 1072 | if (!oldif) { |
3b300de3 SE |
1073 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1074 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1075 | return; |
1076 | } | |
1077 | ||
807736f6 | 1078 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1079 | if (!hash) |
1080 | return; | |
1081 | ||
1082 | for (i = 0; i < hash->size; i++) { | |
1083 | head = &hash->table[i]; | |
1084 | ||
1085 | rcu_read_lock(); | |
1086 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1087 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1088 | if (!batadv_compare_eth(backbone_gw->orig, |
1089 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1090 | continue; |
1091 | ||
1092 | memcpy(backbone_gw->orig, | |
1093 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1094 | /* send an announce frame so others will ask for our | |
1095 | * claims and update their tables. | |
1096 | */ | |
3b300de3 | 1097 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1098 | } |
1099 | rcu_read_unlock(); | |
1100 | } | |
1101 | } | |
1102 | ||
23721387 SW |
1103 | /* periodic work to do: |
1104 | * * purge structures when they are too old | |
1105 | * * send announcements | |
1106 | */ | |
3b300de3 | 1107 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1108 | { |
bbb1f90e | 1109 | struct delayed_work *delayed_work; |
56303d34 | 1110 | struct batadv_priv *bat_priv; |
807736f6 | 1111 | struct batadv_priv_bla *priv_bla; |
23721387 SW |
1112 | struct hlist_node *node; |
1113 | struct hlist_head *head; | |
56303d34 | 1114 | struct batadv_backbone_gw *backbone_gw; |
5bf74e9c | 1115 | struct batadv_hashtable *hash; |
56303d34 | 1116 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1117 | int i; |
1118 | ||
bbb1f90e | 1119 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1120 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1121 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1122 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1123 | if (!primary_if) |
1124 | goto out; | |
1125 | ||
3b300de3 SE |
1126 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1127 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1128 | |
1129 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1130 | goto out; | |
1131 | ||
807736f6 | 1132 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1133 | if (!hash) |
1134 | goto out; | |
1135 | ||
1136 | for (i = 0; i < hash->size; i++) { | |
1137 | head = &hash->table[i]; | |
1138 | ||
1139 | rcu_read_lock(); | |
1140 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1141 | if (!batadv_compare_eth(backbone_gw->orig, |
1142 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1143 | continue; |
1144 | ||
1145 | backbone_gw->lasttime = jiffies; | |
1146 | ||
3b300de3 | 1147 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1148 | |
1149 | /* request_sent is only set after creation to avoid | |
1150 | * problems when we are not yet known as backbone gw | |
1151 | * in the backbone. | |
1152 | * | |
28709878 SW |
1153 | * We can reset this now after we waited some periods |
1154 | * to give bridge forward delays and bla group forming | |
1155 | * some grace time. | |
d807f272 SW |
1156 | */ |
1157 | ||
1158 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1159 | continue; | |
1160 | ||
28709878 SW |
1161 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1162 | continue; | |
1163 | ||
d807f272 SW |
1164 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1165 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1166 | } |
1167 | rcu_read_unlock(); | |
1168 | } | |
1169 | out: | |
1170 | if (primary_if) | |
e5d89254 | 1171 | batadv_hardif_free_ref(primary_if); |
23721387 | 1172 | |
72414442 AQ |
1173 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1174 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1175 | } |
1176 | ||
5d52dad2 SE |
1177 | /* The hash for claim and backbone hash receive the same key because they |
1178 | * are getting initialized by hash_new with the same key. Reinitializing | |
1179 | * them with to different keys to allow nested locking without generating | |
1180 | * lockdep warnings | |
1181 | */ | |
3b300de3 SE |
1182 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1183 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1184 | |
23721387 | 1185 | /* initialize all bla structures */ |
56303d34 | 1186 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1187 | { |
fe2da6ff | 1188 | int i; |
38ef3d1d | 1189 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1190 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1191 | uint16_t crc; |
1192 | unsigned long entrytime; | |
fe2da6ff | 1193 | |
7dac7b76 LL |
1194 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1195 | ||
39c75a51 | 1196 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1197 | |
38ef3d1d | 1198 | /* setting claim destination address */ |
807736f6 SE |
1199 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1200 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1201 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1202 | if (primary_if) { |
807736f6 SE |
1203 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1204 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1205 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1206 | } else { |
807736f6 | 1207 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1208 | } |
1209 | ||
fe2da6ff | 1210 | /* initialize the duplicate list */ |
807736f6 | 1211 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1212 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1213 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1214 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1215 | |
807736f6 | 1216 | if (bat_priv->bla.claim_hash) |
5346c35e | 1217 | return 0; |
23721387 | 1218 | |
807736f6 SE |
1219 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1220 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1221 | |
807736f6 | 1222 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1223 | return -ENOMEM; |
23721387 | 1224 | |
807736f6 | 1225 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1226 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1227 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1228 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1229 | |
39c75a51 | 1230 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1231 | |
72414442 AQ |
1232 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1233 | ||
1234 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1235 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1236 | return 0; |
23721387 SW |
1237 | } |
1238 | ||
2c53040f BH |
1239 | /** |
1240 | * batadv_bla_check_bcast_duplist | |
1241 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1242 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1243 | * |
1244 | * check if it is on our broadcast list. Another gateway might | |
1245 | * have sent the same packet because it is connected to the same backbone, | |
1246 | * so we have to remove this duplicate. | |
1247 | * | |
1248 | * This is performed by checking the CRC, which will tell us | |
1249 | * with a good chance that it is the same packet. If it is furthermore | |
1250 | * sent by another host, drop it. We allow equal packets from | |
1251 | * the same host however as this might be intended. | |
9cfc7bd6 | 1252 | */ |
56303d34 | 1253 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1254 | struct sk_buff *skb) |
fe2da6ff | 1255 | { |
004e86fc SW |
1256 | int i, curr, ret = 0; |
1257 | __be32 crc; | |
1258 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1259 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1260 | |
004e86fc | 1261 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1262 | |
1263 | /* calculate the crc ... */ | |
004e86fc | 1264 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1265 | |
7dac7b76 LL |
1266 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1267 | ||
42d0b044 | 1268 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1269 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1270 | curr %= BATADV_DUPLIST_SIZE; | |
1271 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1272 | |
1273 | /* we can stop searching if the entry is too old ; | |
1274 | * later entries will be even older | |
1275 | */ | |
42d0b044 SE |
1276 | if (batadv_has_timed_out(entry->entrytime, |
1277 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1278 | break; |
1279 | ||
1280 | if (entry->crc != crc) | |
1281 | continue; | |
1282 | ||
1eda58bf | 1283 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1284 | continue; |
1285 | ||
1286 | /* this entry seems to match: same crc, not too old, | |
1287 | * and from another gw. therefore return 1 to forbid it. | |
1288 | */ | |
7dac7b76 LL |
1289 | ret = 1; |
1290 | goto out; | |
fe2da6ff | 1291 | } |
7dac7b76 LL |
1292 | /* not found, add a new entry (overwrite the oldest entry) |
1293 | * and allow it, its the first occurence. | |
1294 | */ | |
807736f6 | 1295 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1296 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1297 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1298 | entry->crc = crc; |
1299 | entry->entrytime = jiffies; | |
1300 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
807736f6 | 1301 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1302 | |
7dac7b76 LL |
1303 | out: |
1304 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1305 | ||
1306 | return ret; | |
fe2da6ff SW |
1307 | } |
1308 | ||
1309 | ||
1310 | ||
9cfc7bd6 | 1311 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1312 | * @orig: originator mac address |
1313 | * | |
1314 | * check if the originator is a gateway for any VLAN ID. | |
1315 | * | |
1316 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1317 | */ |
56303d34 | 1318 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1319 | { |
807736f6 | 1320 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 SW |
1321 | struct hlist_head *head; |
1322 | struct hlist_node *node; | |
56303d34 | 1323 | struct batadv_backbone_gw *backbone_gw; |
20ff9d59 SW |
1324 | int i; |
1325 | ||
1326 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1327 | return 0; | |
1328 | ||
1329 | if (!hash) | |
1330 | return 0; | |
1331 | ||
1332 | for (i = 0; i < hash->size; i++) { | |
1333 | head = &hash->table[i]; | |
1334 | ||
1335 | rcu_read_lock(); | |
1336 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1337 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1338 | rcu_read_unlock(); |
1339 | return 1; | |
1340 | } | |
1341 | } | |
1342 | rcu_read_unlock(); | |
1343 | } | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | ||
2c53040f BH |
1349 | /** |
1350 | * batadv_bla_is_backbone_gw | |
1351 | * @skb: the frame to be checked | |
23721387 SW |
1352 | * @orig_node: the orig_node of the frame |
1353 | * @hdr_size: maximum length of the frame | |
1354 | * | |
1355 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1356 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1357 | * returns 0. | |
23721387 | 1358 | */ |
08adf151 | 1359 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1360 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1361 | { |
1362 | struct ethhdr *ethhdr; | |
1363 | struct vlan_ethhdr *vhdr; | |
56303d34 | 1364 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1365 | short vid = -1; |
1366 | ||
1367 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1368 | return 0; | |
1369 | ||
1370 | /* first, find out the vid. */ | |
0d125074 | 1371 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1372 | return 0; |
1373 | ||
1374 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1375 | ||
1376 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1377 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1378 | return 0; | |
1379 | ||
c67893d1 | 1380 | vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size); |
23721387 SW |
1381 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; |
1382 | } | |
1383 | ||
1384 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1385 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1386 | orig_node->orig, vid); | |
23721387 SW |
1387 | if (!backbone_gw) |
1388 | return 0; | |
1389 | ||
3b300de3 | 1390 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1391 | return 1; |
1392 | } | |
1393 | ||
1394 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1395 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1396 | { |
56303d34 | 1397 | struct batadv_hard_iface *primary_if; |
23721387 | 1398 | |
807736f6 | 1399 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1400 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1401 | |
807736f6 | 1402 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1403 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1404 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1405 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1406 | } |
807736f6 | 1407 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1408 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1409 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1410 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1411 | } |
1412 | if (primary_if) | |
e5d89254 | 1413 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1414 | } |
1415 | ||
2c53040f BH |
1416 | /** |
1417 | * batadv_bla_rx | |
1418 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1419 | * @skb: the frame to be checked |
1420 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1421 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1422 | * |
1423 | * bla_rx avoidance checks if: | |
1424 | * * we have to race for a claim | |
1425 | * * if the frame is allowed on the LAN | |
1426 | * | |
1427 | * in these cases, the skb is further handled by this function and | |
1428 | * returns 1, otherwise it returns 0 and the caller shall further | |
1429 | * process the skb. | |
23721387 | 1430 | */ |
04c9f416 DM |
1431 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, |
1432 | bool is_bcast) | |
23721387 SW |
1433 | { |
1434 | struct ethhdr *ethhdr; | |
56303d34 SE |
1435 | struct batadv_claim search_claim, *claim = NULL; |
1436 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1437 | int ret; |
1438 | ||
1439 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1440 | ||
e5d89254 | 1441 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1442 | if (!primary_if) |
1443 | goto handled; | |
1444 | ||
1445 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1446 | goto allow; | |
1447 | ||
1448 | ||
807736f6 | 1449 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1450 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1451 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1452 | goto handled; |
1453 | ||
1454 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1455 | search_claim.vid = vid; | |
3b300de3 | 1456 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1457 | |
1458 | if (!claim) { | |
1459 | /* possible optimization: race for a claim */ | |
1460 | /* No claim exists yet, claim it for us! | |
1461 | */ | |
3b300de3 SE |
1462 | batadv_handle_claim(bat_priv, primary_if, |
1463 | primary_if->net_dev->dev_addr, | |
1464 | ethhdr->h_source, vid); | |
23721387 SW |
1465 | goto allow; |
1466 | } | |
1467 | ||
1468 | /* if it is our own claim ... */ | |
1eda58bf SE |
1469 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1470 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1471 | /* ... allow it in any case */ |
1472 | claim->lasttime = jiffies; | |
1473 | goto allow; | |
1474 | } | |
1475 | ||
1476 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1477 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1478 | /* ... drop it. the responsible gateway is in charge. | |
1479 | * | |
1480 | * We need to check is_bcast because with the gateway | |
1481 | * feature, broadcasts (like DHCP requests) may be sent | |
1482 | * using a unicast packet type. | |
1483 | */ | |
23721387 SW |
1484 | goto handled; |
1485 | } else { | |
1486 | /* seems the client considers us as its best gateway. | |
1487 | * send a claim and update the claim table | |
1488 | * immediately. | |
1489 | */ | |
3b300de3 SE |
1490 | batadv_handle_claim(bat_priv, primary_if, |
1491 | primary_if->net_dev->dev_addr, | |
1492 | ethhdr->h_source, vid); | |
23721387 SW |
1493 | goto allow; |
1494 | } | |
1495 | allow: | |
3b300de3 | 1496 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1497 | ret = 0; |
1498 | goto out; | |
1499 | ||
1500 | handled: | |
1501 | kfree_skb(skb); | |
1502 | ret = 1; | |
1503 | ||
1504 | out: | |
1505 | if (primary_if) | |
e5d89254 | 1506 | batadv_hardif_free_ref(primary_if); |
23721387 | 1507 | if (claim) |
3b300de3 | 1508 | batadv_claim_free_ref(claim); |
23721387 SW |
1509 | return ret; |
1510 | } | |
1511 | ||
2c53040f BH |
1512 | /** |
1513 | * batadv_bla_tx | |
1514 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1515 | * @skb: the frame to be checked |
1516 | * @vid: the VLAN ID of the frame | |
1517 | * | |
1518 | * bla_tx checks if: | |
1519 | * * a claim was received which has to be processed | |
1520 | * * the frame is allowed on the mesh | |
1521 | * | |
1522 | * in these cases, the skb is further handled by this function and | |
1523 | * returns 1, otherwise it returns 0 and the caller shall further | |
1524 | * process the skb. | |
23721387 | 1525 | */ |
56303d34 | 1526 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1527 | { |
1528 | struct ethhdr *ethhdr; | |
56303d34 SE |
1529 | struct batadv_claim search_claim, *claim = NULL; |
1530 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1531 | int ret = 0; |
1532 | ||
e5d89254 | 1533 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1534 | if (!primary_if) |
1535 | goto out; | |
1536 | ||
1537 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1538 | goto allow; | |
1539 | ||
1540 | /* in VLAN case, the mac header might not be set. */ | |
1541 | skb_reset_mac_header(skb); | |
1542 | ||
3b300de3 | 1543 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1544 | goto handled; |
1545 | ||
1546 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1547 | ||
807736f6 | 1548 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1549 | /* don't allow broadcasts while requests are in flight */ |
1550 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1551 | goto handled; | |
1552 | ||
1553 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1554 | search_claim.vid = vid; | |
1555 | ||
3b300de3 | 1556 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1557 | |
1558 | /* if no claim exists, allow it. */ | |
1559 | if (!claim) | |
1560 | goto allow; | |
1561 | ||
1562 | /* check if we are responsible. */ | |
1eda58bf SE |
1563 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1564 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1565 | /* if yes, the client has roamed and we have |
1566 | * to unclaim it. | |
1567 | */ | |
3b300de3 SE |
1568 | batadv_handle_unclaim(bat_priv, primary_if, |
1569 | primary_if->net_dev->dev_addr, | |
1570 | ethhdr->h_source, vid); | |
23721387 SW |
1571 | goto allow; |
1572 | } | |
1573 | ||
1574 | /* check if it is a multicast/broadcast frame */ | |
1575 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1576 | /* drop it. the responsible gateway has forwarded it into | |
1577 | * the backbone network. | |
1578 | */ | |
1579 | goto handled; | |
1580 | } else { | |
1581 | /* we must allow it. at least if we are | |
1582 | * responsible for the DESTINATION. | |
1583 | */ | |
1584 | goto allow; | |
1585 | } | |
1586 | allow: | |
3b300de3 | 1587 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1588 | ret = 0; |
1589 | goto out; | |
1590 | handled: | |
1591 | ret = 1; | |
1592 | out: | |
1593 | if (primary_if) | |
e5d89254 | 1594 | batadv_hardif_free_ref(primary_if); |
23721387 | 1595 | if (claim) |
3b300de3 | 1596 | batadv_claim_free_ref(claim); |
23721387 SW |
1597 | return ret; |
1598 | } | |
9bf8e4d4 | 1599 | |
08adf151 | 1600 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1601 | { |
1602 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1603 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1604 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
56303d34 SE |
1605 | struct batadv_claim *claim; |
1606 | struct batadv_hard_iface *primary_if; | |
9bf8e4d4 SW |
1607 | struct hlist_node *node; |
1608 | struct hlist_head *head; | |
1609 | uint32_t i; | |
1610 | bool is_own; | |
1eda58bf | 1611 | uint8_t *primary_addr; |
9bf8e4d4 | 1612 | |
30da63a6 ML |
1613 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1614 | if (!primary_if) | |
9bf8e4d4 | 1615 | goto out; |
9bf8e4d4 | 1616 | |
1eda58bf | 1617 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1618 | seq_printf(seq, |
39a32991 | 1619 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1620 | net_dev->name, primary_addr, |
807736f6 | 1621 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1622 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1623 | "Client", "VID", "Originator", "CRC"); |
1624 | for (i = 0; i < hash->size; i++) { | |
1625 | head = &hash->table[i]; | |
1626 | ||
1627 | rcu_read_lock(); | |
1628 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1629 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1630 | primary_addr); | |
39a32991 | 1631 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%#.4x)\n", |
9bf8e4d4 SW |
1632 | claim->addr, claim->vid, |
1633 | claim->backbone_gw->orig, | |
1634 | (is_own ? 'x' : ' '), | |
1635 | claim->backbone_gw->crc); | |
1636 | } | |
1637 | rcu_read_unlock(); | |
1638 | } | |
1639 | out: | |
1640 | if (primary_if) | |
e5d89254 | 1641 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1642 | return 0; |
9bf8e4d4 | 1643 | } |
536a23f1 SW |
1644 | |
1645 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1646 | { | |
1647 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1648 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1649 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
536a23f1 SW |
1650 | struct batadv_backbone_gw *backbone_gw; |
1651 | struct batadv_hard_iface *primary_if; | |
1652 | struct hlist_node *node; | |
1653 | struct hlist_head *head; | |
1654 | int secs, msecs; | |
1655 | uint32_t i; | |
1656 | bool is_own; | |
536a23f1 SW |
1657 | uint8_t *primary_addr; |
1658 | ||
30da63a6 ML |
1659 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1660 | if (!primary_if) | |
536a23f1 | 1661 | goto out; |
536a23f1 SW |
1662 | |
1663 | primary_addr = primary_if->net_dev->dev_addr; | |
1664 | seq_printf(seq, | |
39a32991 | 1665 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1666 | net_dev->name, primary_addr, |
807736f6 | 1667 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1668 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1669 | "Originator", "VID", "last seen", "CRC"); |
1670 | for (i = 0; i < hash->size; i++) { | |
1671 | head = &hash->table[i]; | |
1672 | ||
1673 | rcu_read_lock(); | |
1674 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1675 | msecs = jiffies_to_msecs(jiffies - | |
1676 | backbone_gw->lasttime); | |
1677 | secs = msecs / 1000; | |
1678 | msecs = msecs % 1000; | |
1679 | ||
1680 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1681 | primary_addr); | |
1682 | if (is_own) | |
1683 | continue; | |
1684 | ||
1685 | seq_printf(seq, | |
39a32991 | 1686 | " * %pM on % 5d % 4i.%03is (%#.4x)\n", |
536a23f1 SW |
1687 | backbone_gw->orig, backbone_gw->vid, |
1688 | secs, msecs, backbone_gw->crc); | |
1689 | } | |
1690 | rcu_read_unlock(); | |
1691 | } | |
1692 | out: | |
1693 | if (primary_if) | |
1694 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1695 | return 0; |
536a23f1 | 1696 | } |