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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 | { |
07568d03 | 60 | 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) { | |
238 | ||
239 | if (claim->backbone_gw != backbone_gw) | |
240 | continue; | |
241 | ||
3b300de3 | 242 | batadv_claim_free_ref(claim); |
23721387 SW |
243 | hlist_del_rcu(node); |
244 | } | |
245 | spin_unlock_bh(list_lock); | |
246 | } | |
247 | ||
248 | /* all claims gone, intialize CRC */ | |
3964f728 | 249 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
250 | } |
251 | ||
2c53040f BH |
252 | /** |
253 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
254 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
255 | * @orig: the mac address to be announced within the claim |
256 | * @vid: the VLAN ID | |
257 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 258 | */ |
56303d34 | 259 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
3b300de3 | 260 | short vid, int claimtype) |
23721387 SW |
261 | { |
262 | struct sk_buff *skb; | |
263 | struct ethhdr *ethhdr; | |
56303d34 | 264 | struct batadv_hard_iface *primary_if; |
23721387 SW |
265 | struct net_device *soft_iface; |
266 | uint8_t *hw_src; | |
96412690 | 267 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 268 | __be32 zeroip = 0; |
23721387 | 269 | |
e5d89254 | 270 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
271 | if (!primary_if) |
272 | return; | |
273 | ||
807736f6 | 274 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 275 | sizeof(local_claim_dest)); |
23721387 SW |
276 | local_claim_dest.type = claimtype; |
277 | ||
278 | soft_iface = primary_if->soft_iface; | |
279 | ||
280 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
281 | /* IP DST: 0.0.0.0 */ | |
282 | zeroip, | |
283 | primary_if->soft_iface, | |
284 | /* IP SRC: 0.0.0.0 */ | |
285 | zeroip, | |
286 | /* Ethernet DST: Broadcast */ | |
287 | NULL, | |
288 | /* Ethernet SRC/HW SRC: originator mac */ | |
289 | primary_if->net_dev->dev_addr, | |
99e966fc | 290 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 291 | * with XX = claim type |
38ef3d1d | 292 | * and YY:YY = group id |
23721387 SW |
293 | */ |
294 | (uint8_t *)&local_claim_dest); | |
295 | ||
296 | if (!skb) | |
297 | goto out; | |
298 | ||
299 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 300 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
301 | |
302 | /* now we pretend that the client would have sent this ... */ | |
303 | switch (claimtype) { | |
3eb8773e | 304 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
305 | /* normal claim frame |
306 | * set Ethernet SRC to the clients mac | |
307 | */ | |
308 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
39c75a51 | 309 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 310 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); |
23721387 | 311 | break; |
3eb8773e | 312 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
313 | /* unclaim frame |
314 | * set HW SRC to the clients mac | |
315 | */ | |
316 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 317 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
318 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
319 | vid); | |
23721387 | 320 | break; |
acd34afa | 321 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
322 | /* announcement frame |
323 | * set HW SRC to the special mac containg the crc | |
324 | */ | |
325 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 326 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
327 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
328 | ethhdr->h_source, vid); | |
23721387 | 329 | break; |
acd34afa | 330 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 331 | /* request frame |
99e966fc SW |
332 | * set HW SRC and header destination to the receiving backbone |
333 | * gws mac | |
23721387 SW |
334 | */ |
335 | memcpy(hw_src, mac, ETH_ALEN); | |
336 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 337 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
338 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", |
339 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 SW |
340 | break; |
341 | ||
342 | } | |
343 | ||
344 | if (vid != -1) | |
345 | skb = vlan_insert_tag(skb, vid); | |
346 | ||
347 | skb_reset_mac_header(skb); | |
348 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
349 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
350 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
351 | skb->len + ETH_HLEN); | |
23721387 SW |
352 | soft_iface->last_rx = jiffies; |
353 | ||
354 | netif_rx(skb); | |
355 | out: | |
356 | if (primary_if) | |
e5d89254 | 357 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
358 | } |
359 | ||
2c53040f BH |
360 | /** |
361 | * batadv_bla_get_backbone_gw | |
362 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
363 | * @orig: the mac address of the originator |
364 | * @vid: the VLAN ID | |
365 | * | |
366 | * searches for the backbone gw or creates a new one if it could not | |
367 | * be found. | |
368 | */ | |
56303d34 SE |
369 | static struct batadv_backbone_gw * |
370 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, | |
52aebd6a | 371 | short vid, bool own_backbone) |
23721387 | 372 | { |
56303d34 SE |
373 | struct batadv_backbone_gw *entry; |
374 | struct batadv_orig_node *orig_node; | |
23721387 SW |
375 | int hash_added; |
376 | ||
3b300de3 | 377 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
378 | |
379 | if (entry) | |
380 | return entry; | |
381 | ||
39c75a51 | 382 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
383 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
384 | orig, vid); | |
23721387 SW |
385 | |
386 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
387 | if (!entry) | |
388 | return NULL; | |
389 | ||
390 | entry->vid = vid; | |
391 | entry->lasttime = jiffies; | |
3964f728 | 392 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
393 | entry->bat_priv = bat_priv; |
394 | atomic_set(&entry->request_sent, 0); | |
28709878 | 395 | atomic_set(&entry->wait_periods, 0); |
23721387 SW |
396 | memcpy(entry->orig, orig, ETH_ALEN); |
397 | ||
398 | /* one for the hash, one for returning */ | |
399 | atomic_set(&entry->refcount, 2); | |
400 | ||
807736f6 | 401 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
402 | batadv_compare_backbone_gw, |
403 | batadv_choose_backbone_gw, entry, | |
404 | &entry->hash_entry); | |
23721387 SW |
405 | |
406 | if (unlikely(hash_added != 0)) { | |
407 | /* hash failed, free the structure */ | |
408 | kfree(entry); | |
409 | return NULL; | |
410 | } | |
411 | ||
20ff9d59 | 412 | /* this is a gateway now, remove any tt entries */ |
da641193 | 413 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 414 | if (orig_node) { |
08c36d3e SE |
415 | batadv_tt_global_del_orig(bat_priv, orig_node, |
416 | "became a backbone gateway"); | |
7d211efc | 417 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 418 | } |
52aebd6a | 419 | |
d807f272 | 420 | if (own_backbone) { |
52aebd6a SW |
421 | batadv_bla_send_announce(bat_priv, entry); |
422 | ||
d807f272 SW |
423 | /* this will be decreased in the worker thread */ |
424 | atomic_inc(&entry->request_sent); | |
28709878 | 425 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
426 | atomic_inc(&bat_priv->bla.num_requests); |
427 | } | |
428 | ||
23721387 SW |
429 | return entry; |
430 | } | |
431 | ||
432 | /* update or add the own backbone gw to make sure we announce | |
433 | * where we receive other backbone gws | |
434 | */ | |
56303d34 SE |
435 | static void |
436 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
437 | struct batadv_hard_iface *primary_if, | |
438 | short vid) | |
23721387 | 439 | { |
56303d34 | 440 | struct batadv_backbone_gw *backbone_gw; |
23721387 | 441 | |
3b300de3 SE |
442 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
443 | primary_if->net_dev->dev_addr, | |
52aebd6a | 444 | vid, true); |
23721387 SW |
445 | if (unlikely(!backbone_gw)) |
446 | return; | |
447 | ||
448 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 449 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
450 | } |
451 | ||
9cfc7bd6 | 452 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
453 | * @vid: the vid where the request came on |
454 | * | |
455 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
456 | * to allow the requester another check if the CRC is correct now. | |
457 | */ | |
56303d34 SE |
458 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
459 | struct batadv_hard_iface *primary_if, | |
460 | short vid) | |
23721387 SW |
461 | { |
462 | struct hlist_node *node; | |
463 | struct hlist_head *head; | |
5bf74e9c | 464 | struct batadv_hashtable *hash; |
56303d34 SE |
465 | struct batadv_claim *claim; |
466 | struct batadv_backbone_gw *backbone_gw; | |
23721387 SW |
467 | int i; |
468 | ||
39c75a51 | 469 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 470 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 471 | |
3b300de3 SE |
472 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
473 | primary_if->net_dev->dev_addr, | |
474 | vid); | |
23721387 SW |
475 | if (!backbone_gw) |
476 | return; | |
477 | ||
807736f6 | 478 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
479 | for (i = 0; i < hash->size; i++) { |
480 | head = &hash->table[i]; | |
481 | ||
482 | rcu_read_lock(); | |
483 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
484 | /* only own claims are interesting */ | |
485 | if (claim->backbone_gw != backbone_gw) | |
486 | continue; | |
487 | ||
3b300de3 | 488 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 489 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
490 | } |
491 | rcu_read_unlock(); | |
492 | } | |
493 | ||
494 | /* finally, send an announcement frame */ | |
3b300de3 SE |
495 | batadv_bla_send_announce(bat_priv, backbone_gw); |
496 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
497 | } |
498 | ||
9cfc7bd6 | 499 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
500 | * |
501 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
502 | * After the request, it will repeat all of his own claims and finally | |
503 | * send an announcement claim with which we can check again. | |
504 | */ | |
56303d34 | 505 | static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw) |
23721387 SW |
506 | { |
507 | /* first, remove all old entries */ | |
3b300de3 | 508 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 509 | |
39c75a51 SE |
510 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
511 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
512 | |
513 | /* send request */ | |
3b300de3 | 514 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 515 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
516 | |
517 | /* no local broadcasts should be sent or received, for now. */ | |
518 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 519 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
520 | atomic_set(&backbone_gw->request_sent, 1); |
521 | } | |
522 | } | |
523 | ||
9cfc7bd6 | 524 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
525 | * @backbone_gw: our backbone gateway which should be announced |
526 | * | |
527 | * This function sends an announcement. It is called from multiple | |
528 | * places. | |
529 | */ | |
56303d34 SE |
530 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
531 | struct batadv_backbone_gw *backbone_gw) | |
23721387 SW |
532 | { |
533 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 534 | __be16 crc; |
23721387 | 535 | |
3b300de3 | 536 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 537 | crc = htons(backbone_gw->crc); |
1a5852d8 | 538 | memcpy(&mac[4], &crc, 2); |
23721387 | 539 | |
3b300de3 | 540 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 541 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
542 | |
543 | } | |
544 | ||
2c53040f BH |
545 | /** |
546 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
547 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
548 | * @mac: the mac address of the claim |
549 | * @vid: the VLAN ID of the frame | |
550 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 551 | */ |
56303d34 SE |
552 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
553 | const uint8_t *mac, const short vid, | |
554 | struct batadv_backbone_gw *backbone_gw) | |
23721387 | 555 | { |
56303d34 SE |
556 | struct batadv_claim *claim; |
557 | struct batadv_claim search_claim; | |
23721387 SW |
558 | int hash_added; |
559 | ||
560 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
561 | search_claim.vid = vid; | |
3b300de3 | 562 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
563 | |
564 | /* create a new claim entry if it does not exist yet. */ | |
565 | if (!claim) { | |
566 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
567 | if (!claim) | |
568 | return; | |
569 | ||
570 | memcpy(claim->addr, mac, ETH_ALEN); | |
571 | claim->vid = vid; | |
572 | claim->lasttime = jiffies; | |
573 | claim->backbone_gw = backbone_gw; | |
574 | ||
575 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 576 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
577 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
578 | mac, vid); | |
807736f6 | 579 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
580 | batadv_compare_claim, |
581 | batadv_choose_claim, claim, | |
582 | &claim->hash_entry); | |
23721387 SW |
583 | |
584 | if (unlikely(hash_added != 0)) { | |
585 | /* only local changes happened. */ | |
586 | kfree(claim); | |
587 | return; | |
588 | } | |
589 | } else { | |
590 | claim->lasttime = jiffies; | |
591 | if (claim->backbone_gw == backbone_gw) | |
592 | /* no need to register a new backbone */ | |
593 | goto claim_free_ref; | |
594 | ||
39c75a51 | 595 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
596 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
597 | mac, vid); | |
23721387 | 598 | |
bbb1f90e | 599 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 600 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
601 | |
602 | } | |
603 | /* set (new) backbone gw */ | |
604 | atomic_inc(&backbone_gw->refcount); | |
605 | claim->backbone_gw = backbone_gw; | |
606 | ||
607 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
608 | backbone_gw->lasttime = jiffies; | |
609 | ||
610 | claim_free_ref: | |
3b300de3 | 611 | batadv_claim_free_ref(claim); |
23721387 SW |
612 | } |
613 | ||
614 | /* Delete a claim from the claim hash which has the | |
615 | * given mac address and vid. | |
616 | */ | |
56303d34 SE |
617 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
618 | const uint8_t *mac, const short vid) | |
23721387 | 619 | { |
56303d34 | 620 | struct batadv_claim search_claim, *claim; |
23721387 SW |
621 | |
622 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
623 | search_claim.vid = vid; | |
3b300de3 | 624 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
625 | if (!claim) |
626 | return; | |
627 | ||
39c75a51 SE |
628 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
629 | mac, vid); | |
23721387 | 630 | |
807736f6 | 631 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
632 | batadv_choose_claim, claim); |
633 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
634 | |
635 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
636 | ||
637 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 638 | batadv_claim_free_ref(claim); |
23721387 SW |
639 | } |
640 | ||
641 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 642 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 SE |
643 | uint8_t *an_addr, uint8_t *backbone_addr, |
644 | short vid) | |
23721387 | 645 | { |
56303d34 | 646 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
647 | uint16_t crc; |
648 | ||
3b300de3 | 649 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
650 | return 0; |
651 | ||
52aebd6a SW |
652 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
653 | false); | |
23721387 SW |
654 | |
655 | if (unlikely(!backbone_gw)) | |
656 | return 1; | |
657 | ||
658 | ||
659 | /* handle as ANNOUNCE frame */ | |
660 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 661 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 662 | |
39c75a51 | 663 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
664 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", |
665 | vid, backbone_gw->orig, crc); | |
23721387 SW |
666 | |
667 | if (backbone_gw->crc != crc) { | |
39c75a51 | 668 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
669 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", |
670 | backbone_gw->orig, backbone_gw->vid, | |
671 | backbone_gw->crc, crc); | |
23721387 | 672 | |
3b300de3 | 673 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
674 | } else { |
675 | /* if we have sent a request and the crc was OK, | |
676 | * we can allow traffic again. | |
677 | */ | |
678 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 679 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
680 | atomic_set(&backbone_gw->request_sent, 0); |
681 | } | |
682 | } | |
683 | ||
3b300de3 | 684 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
685 | return 1; |
686 | } | |
687 | ||
688 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
689 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
690 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
691 | uint8_t *backbone_addr, |
692 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
693 | { |
694 | /* check for REQUEST frame */ | |
1eda58bf | 695 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
696 | return 0; |
697 | ||
698 | /* sanity check, this should not happen on a normal switch, | |
699 | * we ignore it in this case. | |
700 | */ | |
1eda58bf | 701 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
702 | return 1; |
703 | ||
39c75a51 | 704 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
705 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
706 | vid, ethhdr->h_source); | |
23721387 | 707 | |
3b300de3 | 708 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
709 | return 1; |
710 | } | |
711 | ||
712 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
713 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
714 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
715 | uint8_t *backbone_addr, |
716 | uint8_t *claim_addr, short vid) | |
23721387 | 717 | { |
56303d34 | 718 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
719 | |
720 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
721 | if (primary_if && batadv_compare_eth(backbone_addr, |
722 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 723 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 724 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 725 | |
3b300de3 | 726 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
727 | |
728 | if (!backbone_gw) | |
729 | return 1; | |
730 | ||
731 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 732 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
733 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
734 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 735 | |
3b300de3 SE |
736 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
737 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
738 | return 1; |
739 | } | |
740 | ||
741 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
742 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
743 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
744 | uint8_t *backbone_addr, uint8_t *claim_addr, |
745 | short vid) | |
23721387 | 746 | { |
56303d34 | 747 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
748 | |
749 | /* register the gateway if not yet available, and add the claim. */ | |
750 | ||
52aebd6a SW |
751 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
752 | false); | |
23721387 SW |
753 | |
754 | if (unlikely(!backbone_gw)) | |
755 | return 1; | |
756 | ||
757 | /* this must be a CLAIM frame */ | |
3b300de3 | 758 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 759 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 760 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 761 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
762 | |
763 | /* TODO: we could call something like tt_local_del() here. */ | |
764 | ||
3b300de3 | 765 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
766 | return 1; |
767 | } | |
768 | ||
2c53040f BH |
769 | /** |
770 | * batadv_check_claim_group | |
771 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
772 | * @hw_src: the Hardware source in the ARP Header |
773 | * @hw_dst: the Hardware destination in the ARP Header | |
774 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
775 | * | |
776 | * checks if it is a claim packet and if its on the same group. | |
777 | * This function also applies the group ID of the sender | |
778 | * if it is in the same mesh. | |
779 | * | |
780 | * returns: | |
781 | * 2 - if it is a claim packet and on the same group | |
782 | * 1 - if is a claim packet from another group | |
783 | * 0 - if it is not a claim packet | |
784 | */ | |
56303d34 SE |
785 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
786 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
787 | uint8_t *hw_src, uint8_t *hw_dst, |
788 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
789 | { |
790 | uint8_t *backbone_addr; | |
56303d34 | 791 | struct batadv_orig_node *orig_node; |
96412690 | 792 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 793 | |
96412690 | 794 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 795 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d SW |
796 | |
797 | /* check if it is a claim packet in general */ | |
798 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
799 | sizeof(bla_dst->magic)) != 0) | |
800 | return 0; | |
801 | ||
802 | /* if announcement packet, use the source, | |
803 | * otherwise assume it is in the hw_src | |
804 | */ | |
805 | switch (bla_dst->type) { | |
3eb8773e | 806 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
807 | backbone_addr = hw_src; |
808 | break; | |
acd34afa SE |
809 | case BATADV_CLAIM_TYPE_REQUEST: |
810 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 811 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
812 | backbone_addr = ethhdr->h_source; |
813 | break; | |
814 | default: | |
815 | return 0; | |
816 | } | |
817 | ||
818 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 819 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
820 | return 0; |
821 | ||
822 | /* if its already the same group, it is fine. */ | |
823 | if (bla_dst->group == bla_dst_own->group) | |
824 | return 2; | |
825 | ||
826 | /* lets see if this originator is in our mesh */ | |
da641193 | 827 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
828 | |
829 | /* dont accept claims from gateways which are not in | |
830 | * the same mesh or group. | |
831 | */ | |
832 | if (!orig_node) | |
833 | return 1; | |
834 | ||
835 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
836 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 837 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
838 | "taking other backbones claim group: %04x\n", |
839 | ntohs(bla_dst->group)); | |
38ef3d1d SW |
840 | bla_dst_own->group = bla_dst->group; |
841 | } | |
842 | ||
7d211efc | 843 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
844 | |
845 | return 2; | |
846 | } | |
847 | ||
848 | ||
9cfc7bd6 | 849 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
850 | * @skb: the frame to be checked |
851 | * | |
852 | * Check if this is a claim frame, and process it accordingly. | |
853 | * | |
854 | * returns 1 if it was a claim frame, otherwise return 0 to | |
855 | * tell the callee that it can use the frame on its own. | |
856 | */ | |
56303d34 SE |
857 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
858 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 859 | struct sk_buff *skb) |
23721387 SW |
860 | { |
861 | struct ethhdr *ethhdr; | |
862 | struct vlan_ethhdr *vhdr; | |
863 | struct arphdr *arphdr; | |
864 | uint8_t *hw_src, *hw_dst; | |
96412690 | 865 | struct batadv_bla_claim_dst *bla_dst; |
23721387 SW |
866 | uint16_t proto; |
867 | int headlen; | |
868 | short vid = -1; | |
38ef3d1d | 869 | int ret; |
23721387 SW |
870 | |
871 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
872 | ||
873 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
874 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
875 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
876 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
877 | headlen = sizeof(*vhdr); | |
878 | } else { | |
879 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 880 | headlen = ETH_HLEN; |
23721387 SW |
881 | } |
882 | ||
883 | if (proto != ETH_P_ARP) | |
884 | return 0; /* not a claim frame */ | |
885 | ||
886 | /* this must be a ARP frame. check if it is a claim. */ | |
887 | ||
888 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
889 | return 0; | |
890 | ||
891 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
892 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
893 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
894 | ||
895 | /* Check whether the ARP frame carries a valid | |
896 | * IP information | |
897 | */ | |
23721387 SW |
898 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
899 | return 0; | |
900 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
901 | return 0; | |
902 | if (arphdr->ar_hln != ETH_ALEN) | |
903 | return 0; | |
904 | if (arphdr->ar_pln != 4) | |
905 | return 0; | |
906 | ||
907 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
908 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 909 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
910 | |
911 | /* check if it is a claim frame. */ | |
3b300de3 SE |
912 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
913 | ethhdr); | |
38ef3d1d | 914 | if (ret == 1) |
39c75a51 | 915 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
916 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
917 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
918 | |
919 | if (ret < 2) | |
920 | return ret; | |
23721387 SW |
921 | |
922 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 923 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
924 | |
925 | /* check for the different types of claim frames ... */ | |
926 | switch (bla_dst->type) { | |
3eb8773e | 927 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
928 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
929 | ethhdr->h_source, vid)) | |
23721387 SW |
930 | return 1; |
931 | break; | |
3eb8773e | 932 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
933 | if (batadv_handle_unclaim(bat_priv, primary_if, |
934 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
935 | return 1; |
936 | break; | |
937 | ||
acd34afa | 938 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
939 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
940 | vid)) | |
23721387 SW |
941 | return 1; |
942 | break; | |
acd34afa | 943 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
944 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
945 | vid)) | |
23721387 SW |
946 | return 1; |
947 | break; | |
948 | } | |
949 | ||
39c75a51 | 950 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
951 | "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", |
952 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
953 | return 1; |
954 | } | |
955 | ||
956 | /* Check when we last heard from other nodes, and remove them in case of | |
957 | * a time out, or clean all backbone gws if now is set. | |
958 | */ | |
56303d34 | 959 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 960 | { |
56303d34 | 961 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
962 | struct hlist_node *node, *node_tmp; |
963 | struct hlist_head *head; | |
5bf74e9c | 964 | struct batadv_hashtable *hash; |
23721387 SW |
965 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
966 | int i; | |
967 | ||
807736f6 | 968 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
969 | if (!hash) |
970 | return; | |
971 | ||
972 | for (i = 0; i < hash->size; i++) { | |
973 | head = &hash->table[i]; | |
974 | list_lock = &hash->list_locks[i]; | |
975 | ||
976 | spin_lock_bh(list_lock); | |
977 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
978 | head, hash_entry) { | |
979 | if (now) | |
980 | goto purge_now; | |
1eda58bf | 981 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 982 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
983 | continue; |
984 | ||
39c75a51 | 985 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
986 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
987 | backbone_gw->orig); | |
23721387 SW |
988 | |
989 | purge_now: | |
990 | /* don't wait for the pending request anymore */ | |
991 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 992 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 993 | |
3b300de3 | 994 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
995 | |
996 | hlist_del_rcu(node); | |
3b300de3 | 997 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
998 | } |
999 | spin_unlock_bh(list_lock); | |
1000 | } | |
1001 | } | |
1002 | ||
2c53040f BH |
1003 | /** |
1004 | * batadv_bla_purge_claims | |
1005 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1006 | * @primary_if: the selected primary interface, may be NULL if now is set |
1007 | * @now: whether the whole hash shall be wiped now | |
1008 | * | |
1009 | * Check when we heard last time from our own claims, and remove them in case of | |
1010 | * a time out, or clean all claims if now is set | |
1011 | */ | |
56303d34 SE |
1012 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1013 | struct batadv_hard_iface *primary_if, | |
1014 | int now) | |
23721387 | 1015 | { |
56303d34 | 1016 | struct batadv_claim *claim; |
23721387 SW |
1017 | struct hlist_node *node; |
1018 | struct hlist_head *head; | |
5bf74e9c | 1019 | struct batadv_hashtable *hash; |
23721387 SW |
1020 | int i; |
1021 | ||
807736f6 | 1022 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1023 | if (!hash) |
1024 | return; | |
1025 | ||
1026 | for (i = 0; i < hash->size; i++) { | |
1027 | head = &hash->table[i]; | |
1028 | ||
1029 | rcu_read_lock(); | |
1030 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1031 | if (now) | |
1032 | goto purge_now; | |
1eda58bf SE |
1033 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1034 | primary_if->net_dev->dev_addr)) | |
23721387 | 1035 | continue; |
1eda58bf | 1036 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1037 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1038 | continue; |
1039 | ||
39c75a51 | 1040 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1041 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1042 | claim->addr, claim->vid); | |
23721387 SW |
1043 | |
1044 | purge_now: | |
3b300de3 SE |
1045 | batadv_handle_unclaim(bat_priv, primary_if, |
1046 | claim->backbone_gw->orig, | |
1047 | claim->addr, claim->vid); | |
23721387 SW |
1048 | } |
1049 | rcu_read_unlock(); | |
1050 | } | |
1051 | } | |
1052 | ||
2c53040f BH |
1053 | /** |
1054 | * batadv_bla_update_orig_address | |
1055 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1056 | * @primary_if: the new selected primary_if |
1057 | * @oldif: the old primary interface, may be NULL | |
1058 | * | |
1059 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1060 | */ |
56303d34 SE |
1061 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1062 | struct batadv_hard_iface *primary_if, | |
1063 | struct batadv_hard_iface *oldif) | |
23721387 | 1064 | { |
56303d34 | 1065 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1066 | struct hlist_node *node; |
1067 | struct hlist_head *head; | |
5bf74e9c | 1068 | struct batadv_hashtable *hash; |
807736f6 | 1069 | __be16 group; |
23721387 SW |
1070 | int i; |
1071 | ||
38ef3d1d | 1072 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1073 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1074 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1075 | |
23721387 | 1076 | if (!oldif) { |
3b300de3 SE |
1077 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1078 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1079 | return; |
1080 | } | |
1081 | ||
807736f6 | 1082 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1083 | if (!hash) |
1084 | return; | |
1085 | ||
1086 | for (i = 0; i < hash->size; i++) { | |
1087 | head = &hash->table[i]; | |
1088 | ||
1089 | rcu_read_lock(); | |
1090 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1091 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1092 | if (!batadv_compare_eth(backbone_gw->orig, |
1093 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1094 | continue; |
1095 | ||
1096 | memcpy(backbone_gw->orig, | |
1097 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1098 | /* send an announce frame so others will ask for our | |
1099 | * claims and update their tables. | |
1100 | */ | |
3b300de3 | 1101 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1102 | } |
1103 | rcu_read_unlock(); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | ||
1108 | ||
1109 | /* (re)start the timer */ | |
56303d34 | 1110 | static void batadv_bla_start_timer(struct batadv_priv *bat_priv) |
23721387 | 1111 | { |
807736f6 SE |
1112 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1113 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
42d0b044 | 1114 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
23721387 SW |
1115 | } |
1116 | ||
1117 | /* periodic work to do: | |
1118 | * * purge structures when they are too old | |
1119 | * * send announcements | |
1120 | */ | |
3b300de3 | 1121 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1122 | { |
bbb1f90e | 1123 | struct delayed_work *delayed_work; |
56303d34 | 1124 | struct batadv_priv *bat_priv; |
807736f6 | 1125 | struct batadv_priv_bla *priv_bla; |
23721387 SW |
1126 | struct hlist_node *node; |
1127 | struct hlist_head *head; | |
56303d34 | 1128 | struct batadv_backbone_gw *backbone_gw; |
5bf74e9c | 1129 | struct batadv_hashtable *hash; |
56303d34 | 1130 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1131 | int i; |
1132 | ||
bbb1f90e | 1133 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1134 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1135 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1136 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1137 | if (!primary_if) |
1138 | goto out; | |
1139 | ||
3b300de3 SE |
1140 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1141 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1142 | |
1143 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1144 | goto out; | |
1145 | ||
807736f6 | 1146 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1147 | if (!hash) |
1148 | goto out; | |
1149 | ||
1150 | for (i = 0; i < hash->size; i++) { | |
1151 | head = &hash->table[i]; | |
1152 | ||
1153 | rcu_read_lock(); | |
1154 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1155 | if (!batadv_compare_eth(backbone_gw->orig, |
1156 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1157 | continue; |
1158 | ||
1159 | backbone_gw->lasttime = jiffies; | |
1160 | ||
3b300de3 | 1161 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1162 | |
1163 | /* request_sent is only set after creation to avoid | |
1164 | * problems when we are not yet known as backbone gw | |
1165 | * in the backbone. | |
1166 | * | |
28709878 SW |
1167 | * We can reset this now after we waited some periods |
1168 | * to give bridge forward delays and bla group forming | |
1169 | * some grace time. | |
d807f272 SW |
1170 | */ |
1171 | ||
1172 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1173 | continue; | |
1174 | ||
28709878 SW |
1175 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1176 | continue; | |
1177 | ||
d807f272 SW |
1178 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1179 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1180 | } |
1181 | rcu_read_unlock(); | |
1182 | } | |
1183 | out: | |
1184 | if (primary_if) | |
e5d89254 | 1185 | batadv_hardif_free_ref(primary_if); |
23721387 | 1186 | |
3b300de3 | 1187 | batadv_bla_start_timer(bat_priv); |
23721387 SW |
1188 | } |
1189 | ||
5d52dad2 SE |
1190 | /* The hash for claim and backbone hash receive the same key because they |
1191 | * are getting initialized by hash_new with the same key. Reinitializing | |
1192 | * them with to different keys to allow nested locking without generating | |
1193 | * lockdep warnings | |
1194 | */ | |
3b300de3 SE |
1195 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1196 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1197 | |
23721387 | 1198 | /* initialize all bla structures */ |
56303d34 | 1199 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1200 | { |
fe2da6ff | 1201 | int i; |
38ef3d1d | 1202 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1203 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1204 | uint16_t crc; |
1205 | unsigned long entrytime; | |
fe2da6ff | 1206 | |
7dac7b76 LL |
1207 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1208 | ||
39c75a51 | 1209 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1210 | |
38ef3d1d | 1211 | /* setting claim destination address */ |
807736f6 SE |
1212 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1213 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1214 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1215 | if (primary_if) { |
807736f6 SE |
1216 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1217 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1218 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1219 | } else { |
807736f6 | 1220 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1221 | } |
1222 | ||
fe2da6ff | 1223 | /* initialize the duplicate list */ |
807736f6 | 1224 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1225 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1226 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1227 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1228 | |
807736f6 | 1229 | if (bat_priv->bla.claim_hash) |
5346c35e | 1230 | return 0; |
23721387 | 1231 | |
807736f6 SE |
1232 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1233 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1234 | |
807736f6 | 1235 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1236 | return -ENOMEM; |
23721387 | 1237 | |
807736f6 | 1238 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1239 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1240 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1241 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1242 | |
39c75a51 | 1243 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1244 | |
3b300de3 | 1245 | batadv_bla_start_timer(bat_priv); |
5346c35e | 1246 | return 0; |
23721387 SW |
1247 | } |
1248 | ||
2c53040f BH |
1249 | /** |
1250 | * batadv_bla_check_bcast_duplist | |
1251 | * @bat_priv: the bat priv with all the soft interface information | |
7f112af4 LL |
1252 | * @bcast_packet: encapsulated broadcast frame plus batman header |
1253 | * @bcast_packet_len: length of encapsulated broadcast frame plus batman header | |
fe2da6ff SW |
1254 | * |
1255 | * check if it is on our broadcast list. Another gateway might | |
1256 | * have sent the same packet because it is connected to the same backbone, | |
1257 | * so we have to remove this duplicate. | |
1258 | * | |
1259 | * This is performed by checking the CRC, which will tell us | |
1260 | * with a good chance that it is the same packet. If it is furthermore | |
1261 | * sent by another host, drop it. We allow equal packets from | |
1262 | * the same host however as this might be intended. | |
9cfc7bd6 | 1263 | */ |
56303d34 | 1264 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
96412690 | 1265 | struct batadv_bcast_packet *bcast_packet, |
7f112af4 | 1266 | int bcast_packet_len) |
fe2da6ff | 1267 | { |
7dac7b76 | 1268 | int i, length, curr, ret = 0; |
fe2da6ff SW |
1269 | uint8_t *content; |
1270 | uint16_t crc; | |
56303d34 | 1271 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1272 | |
7f112af4 | 1273 | length = bcast_packet_len - sizeof(*bcast_packet); |
fe2da6ff SW |
1274 | content = (uint8_t *)bcast_packet; |
1275 | content += sizeof(*bcast_packet); | |
1276 | ||
1277 | /* calculate the crc ... */ | |
1278 | crc = crc16(0, content, length); | |
1279 | ||
7dac7b76 LL |
1280 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1281 | ||
42d0b044 | 1282 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1283 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1284 | curr %= BATADV_DUPLIST_SIZE; | |
1285 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1286 | |
1287 | /* we can stop searching if the entry is too old ; | |
1288 | * later entries will be even older | |
1289 | */ | |
42d0b044 SE |
1290 | if (batadv_has_timed_out(entry->entrytime, |
1291 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1292 | break; |
1293 | ||
1294 | if (entry->crc != crc) | |
1295 | continue; | |
1296 | ||
1eda58bf | 1297 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1298 | continue; |
1299 | ||
1300 | /* this entry seems to match: same crc, not too old, | |
1301 | * and from another gw. therefore return 1 to forbid it. | |
1302 | */ | |
7dac7b76 LL |
1303 | ret = 1; |
1304 | goto out; | |
fe2da6ff | 1305 | } |
7dac7b76 LL |
1306 | /* not found, add a new entry (overwrite the oldest entry) |
1307 | * and allow it, its the first occurence. | |
1308 | */ | |
807736f6 | 1309 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1310 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1311 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1312 | entry->crc = crc; |
1313 | entry->entrytime = jiffies; | |
1314 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
807736f6 | 1315 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1316 | |
7dac7b76 LL |
1317 | out: |
1318 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1319 | ||
1320 | return ret; | |
fe2da6ff SW |
1321 | } |
1322 | ||
1323 | ||
1324 | ||
9cfc7bd6 | 1325 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1326 | * @orig: originator mac address |
1327 | * | |
1328 | * check if the originator is a gateway for any VLAN ID. | |
1329 | * | |
1330 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1331 | */ |
56303d34 | 1332 | int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig) |
20ff9d59 | 1333 | { |
807736f6 | 1334 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 SW |
1335 | struct hlist_head *head; |
1336 | struct hlist_node *node; | |
56303d34 | 1337 | struct batadv_backbone_gw *backbone_gw; |
20ff9d59 SW |
1338 | int i; |
1339 | ||
1340 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1341 | return 0; | |
1342 | ||
1343 | if (!hash) | |
1344 | return 0; | |
1345 | ||
1346 | for (i = 0; i < hash->size; i++) { | |
1347 | head = &hash->table[i]; | |
1348 | ||
1349 | rcu_read_lock(); | |
1350 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1351 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1352 | rcu_read_unlock(); |
1353 | return 1; | |
1354 | } | |
1355 | } | |
1356 | rcu_read_unlock(); | |
1357 | } | |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | ||
2c53040f BH |
1363 | /** |
1364 | * batadv_bla_is_backbone_gw | |
1365 | * @skb: the frame to be checked | |
23721387 SW |
1366 | * @orig_node: the orig_node of the frame |
1367 | * @hdr_size: maximum length of the frame | |
1368 | * | |
1369 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1370 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1371 | * returns 0. | |
23721387 | 1372 | */ |
08adf151 | 1373 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1374 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 SW |
1375 | { |
1376 | struct ethhdr *ethhdr; | |
1377 | struct vlan_ethhdr *vhdr; | |
56303d34 | 1378 | struct batadv_backbone_gw *backbone_gw; |
23721387 SW |
1379 | short vid = -1; |
1380 | ||
1381 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1382 | return 0; | |
1383 | ||
1384 | /* first, find out the vid. */ | |
0d125074 | 1385 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1386 | return 0; |
1387 | ||
1388 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1389 | ||
1390 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1391 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1392 | return 0; | |
1393 | ||
c67893d1 | 1394 | vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size); |
23721387 SW |
1395 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; |
1396 | } | |
1397 | ||
1398 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1399 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1400 | orig_node->orig, vid); | |
23721387 SW |
1401 | if (!backbone_gw) |
1402 | return 0; | |
1403 | ||
3b300de3 | 1404 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1405 | return 1; |
1406 | } | |
1407 | ||
1408 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1409 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1410 | { |
56303d34 | 1411 | struct batadv_hard_iface *primary_if; |
23721387 | 1412 | |
807736f6 | 1413 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1414 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1415 | |
807736f6 | 1416 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1417 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1418 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1419 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1420 | } |
807736f6 | 1421 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1422 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1423 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1424 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1425 | } |
1426 | if (primary_if) | |
e5d89254 | 1427 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1428 | } |
1429 | ||
2c53040f BH |
1430 | /** |
1431 | * batadv_bla_rx | |
1432 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1433 | * @skb: the frame to be checked |
1434 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1435 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1436 | * |
1437 | * bla_rx avoidance checks if: | |
1438 | * * we have to race for a claim | |
1439 | * * if the frame is allowed on the LAN | |
1440 | * | |
1441 | * in these cases, the skb is further handled by this function and | |
1442 | * returns 1, otherwise it returns 0 and the caller shall further | |
1443 | * process the skb. | |
23721387 | 1444 | */ |
04c9f416 DM |
1445 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid, |
1446 | bool is_bcast) | |
23721387 SW |
1447 | { |
1448 | struct ethhdr *ethhdr; | |
56303d34 SE |
1449 | struct batadv_claim search_claim, *claim = NULL; |
1450 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1451 | int ret; |
1452 | ||
1453 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1454 | ||
e5d89254 | 1455 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1456 | if (!primary_if) |
1457 | goto handled; | |
1458 | ||
1459 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1460 | goto allow; | |
1461 | ||
1462 | ||
807736f6 | 1463 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1464 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1465 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1466 | goto handled; |
1467 | ||
1468 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1469 | search_claim.vid = vid; | |
3b300de3 | 1470 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1471 | |
1472 | if (!claim) { | |
1473 | /* possible optimization: race for a claim */ | |
1474 | /* No claim exists yet, claim it for us! | |
1475 | */ | |
3b300de3 SE |
1476 | batadv_handle_claim(bat_priv, primary_if, |
1477 | primary_if->net_dev->dev_addr, | |
1478 | ethhdr->h_source, vid); | |
23721387 SW |
1479 | goto allow; |
1480 | } | |
1481 | ||
1482 | /* if it is our own claim ... */ | |
1eda58bf SE |
1483 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1484 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1485 | /* ... allow it in any case */ |
1486 | claim->lasttime = jiffies; | |
1487 | goto allow; | |
1488 | } | |
1489 | ||
1490 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1491 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1492 | /* ... drop it. the responsible gateway is in charge. | |
1493 | * | |
1494 | * We need to check is_bcast because with the gateway | |
1495 | * feature, broadcasts (like DHCP requests) may be sent | |
1496 | * using a unicast packet type. | |
1497 | */ | |
23721387 SW |
1498 | goto handled; |
1499 | } else { | |
1500 | /* seems the client considers us as its best gateway. | |
1501 | * send a claim and update the claim table | |
1502 | * immediately. | |
1503 | */ | |
3b300de3 SE |
1504 | batadv_handle_claim(bat_priv, primary_if, |
1505 | primary_if->net_dev->dev_addr, | |
1506 | ethhdr->h_source, vid); | |
23721387 SW |
1507 | goto allow; |
1508 | } | |
1509 | allow: | |
3b300de3 | 1510 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1511 | ret = 0; |
1512 | goto out; | |
1513 | ||
1514 | handled: | |
1515 | kfree_skb(skb); | |
1516 | ret = 1; | |
1517 | ||
1518 | out: | |
1519 | if (primary_if) | |
e5d89254 | 1520 | batadv_hardif_free_ref(primary_if); |
23721387 | 1521 | if (claim) |
3b300de3 | 1522 | batadv_claim_free_ref(claim); |
23721387 SW |
1523 | return ret; |
1524 | } | |
1525 | ||
2c53040f BH |
1526 | /** |
1527 | * batadv_bla_tx | |
1528 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1529 | * @skb: the frame to be checked |
1530 | * @vid: the VLAN ID of the frame | |
1531 | * | |
1532 | * bla_tx checks if: | |
1533 | * * a claim was received which has to be processed | |
1534 | * * the frame is allowed on the mesh | |
1535 | * | |
1536 | * in these cases, the skb is further handled by this function and | |
1537 | * returns 1, otherwise it returns 0 and the caller shall further | |
1538 | * process the skb. | |
23721387 | 1539 | */ |
56303d34 | 1540 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1541 | { |
1542 | struct ethhdr *ethhdr; | |
56303d34 SE |
1543 | struct batadv_claim search_claim, *claim = NULL; |
1544 | struct batadv_hard_iface *primary_if; | |
23721387 SW |
1545 | int ret = 0; |
1546 | ||
e5d89254 | 1547 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1548 | if (!primary_if) |
1549 | goto out; | |
1550 | ||
1551 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1552 | goto allow; | |
1553 | ||
1554 | /* in VLAN case, the mac header might not be set. */ | |
1555 | skb_reset_mac_header(skb); | |
1556 | ||
3b300de3 | 1557 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1558 | goto handled; |
1559 | ||
1560 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1561 | ||
807736f6 | 1562 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1563 | /* don't allow broadcasts while requests are in flight */ |
1564 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1565 | goto handled; | |
1566 | ||
1567 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1568 | search_claim.vid = vid; | |
1569 | ||
3b300de3 | 1570 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1571 | |
1572 | /* if no claim exists, allow it. */ | |
1573 | if (!claim) | |
1574 | goto allow; | |
1575 | ||
1576 | /* check if we are responsible. */ | |
1eda58bf SE |
1577 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1578 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1579 | /* if yes, the client has roamed and we have |
1580 | * to unclaim it. | |
1581 | */ | |
3b300de3 SE |
1582 | batadv_handle_unclaim(bat_priv, primary_if, |
1583 | primary_if->net_dev->dev_addr, | |
1584 | ethhdr->h_source, vid); | |
23721387 SW |
1585 | goto allow; |
1586 | } | |
1587 | ||
1588 | /* check if it is a multicast/broadcast frame */ | |
1589 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1590 | /* drop it. the responsible gateway has forwarded it into | |
1591 | * the backbone network. | |
1592 | */ | |
1593 | goto handled; | |
1594 | } else { | |
1595 | /* we must allow it. at least if we are | |
1596 | * responsible for the DESTINATION. | |
1597 | */ | |
1598 | goto allow; | |
1599 | } | |
1600 | allow: | |
3b300de3 | 1601 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1602 | ret = 0; |
1603 | goto out; | |
1604 | handled: | |
1605 | ret = 1; | |
1606 | out: | |
1607 | if (primary_if) | |
e5d89254 | 1608 | batadv_hardif_free_ref(primary_if); |
23721387 | 1609 | if (claim) |
3b300de3 | 1610 | batadv_claim_free_ref(claim); |
23721387 SW |
1611 | return ret; |
1612 | } | |
9bf8e4d4 | 1613 | |
08adf151 | 1614 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1615 | { |
1616 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1617 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1618 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
56303d34 SE |
1619 | struct batadv_claim *claim; |
1620 | struct batadv_hard_iface *primary_if; | |
9bf8e4d4 SW |
1621 | struct hlist_node *node; |
1622 | struct hlist_head *head; | |
1623 | uint32_t i; | |
1624 | bool is_own; | |
1eda58bf | 1625 | uint8_t *primary_addr; |
9bf8e4d4 | 1626 | |
30da63a6 ML |
1627 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1628 | if (!primary_if) | |
9bf8e4d4 | 1629 | goto out; |
9bf8e4d4 | 1630 | |
1eda58bf | 1631 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d SW |
1632 | seq_printf(seq, |
1633 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1eda58bf | 1634 | net_dev->name, primary_addr, |
807736f6 | 1635 | ntohs(bat_priv->bla.claim_dest.group)); |
9bf8e4d4 SW |
1636 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1637 | "Client", "VID", "Originator", "CRC"); | |
1638 | for (i = 0; i < hash->size; i++) { | |
1639 | head = &hash->table[i]; | |
1640 | ||
1641 | rcu_read_lock(); | |
1642 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1643 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1644 | primary_addr); | |
9bf8e4d4 SW |
1645 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", |
1646 | claim->addr, claim->vid, | |
1647 | claim->backbone_gw->orig, | |
1648 | (is_own ? 'x' : ' '), | |
1649 | claim->backbone_gw->crc); | |
1650 | } | |
1651 | rcu_read_unlock(); | |
1652 | } | |
1653 | out: | |
1654 | if (primary_if) | |
e5d89254 | 1655 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1656 | return 0; |
9bf8e4d4 | 1657 | } |
536a23f1 SW |
1658 | |
1659 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1660 | { | |
1661 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1662 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1663 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
536a23f1 SW |
1664 | struct batadv_backbone_gw *backbone_gw; |
1665 | struct batadv_hard_iface *primary_if; | |
1666 | struct hlist_node *node; | |
1667 | struct hlist_head *head; | |
1668 | int secs, msecs; | |
1669 | uint32_t i; | |
1670 | bool is_own; | |
536a23f1 SW |
1671 | uint8_t *primary_addr; |
1672 | ||
30da63a6 ML |
1673 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1674 | if (!primary_if) | |
536a23f1 | 1675 | goto out; |
536a23f1 SW |
1676 | |
1677 | primary_addr = primary_if->net_dev->dev_addr; | |
1678 | seq_printf(seq, | |
1679 | "Backbones announced for the mesh %s (orig %pM, group id %04x)\n", | |
1680 | net_dev->name, primary_addr, | |
807736f6 | 1681 | ntohs(bat_priv->bla.claim_dest.group)); |
536a23f1 SW |
1682 | seq_printf(seq, " %-17s %-5s %-9s (%-4s)\n", |
1683 | "Originator", "VID", "last seen", "CRC"); | |
1684 | for (i = 0; i < hash->size; i++) { | |
1685 | head = &hash->table[i]; | |
1686 | ||
1687 | rcu_read_lock(); | |
1688 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1689 | msecs = jiffies_to_msecs(jiffies - | |
1690 | backbone_gw->lasttime); | |
1691 | secs = msecs / 1000; | |
1692 | msecs = msecs % 1000; | |
1693 | ||
1694 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1695 | primary_addr); | |
1696 | if (is_own) | |
1697 | continue; | |
1698 | ||
1699 | seq_printf(seq, | |
1700 | " * %pM on % 5d % 4i.%03is (%04x)\n", | |
1701 | backbone_gw->orig, backbone_gw->vid, | |
1702 | secs, msecs, backbone_gw->crc); | |
1703 | } | |
1704 | rcu_read_unlock(); | |
1705 | } | |
1706 | out: | |
1707 | if (primary_if) | |
1708 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1709 | return 0; |
536a23f1 | 1710 | } |