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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 SE |
36 | static void batadv_bla_periodic_work(struct work_struct *work); |
37 | static void batadv_bla_send_announce(struct bat_priv *bat_priv, | |
38 | struct backbone_gw *backbone_gw); | |
23721387 SW |
39 | |
40 | /* return the index of the claim */ | |
3b300de3 | 41 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
23721387 SW |
42 | { |
43 | const unsigned char *key = data; | |
44 | uint32_t hash = 0; | |
45 | size_t i; | |
46 | ||
47 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
48 | hash += key[i]; | |
49 | hash += (hash << 10); | |
50 | hash ^= (hash >> 6); | |
51 | } | |
52 | ||
53 | hash += (hash << 3); | |
54 | hash ^= (hash >> 11); | |
55 | hash += (hash << 15); | |
56 | ||
57 | return hash % size; | |
58 | } | |
59 | ||
60 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
61 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
62 | uint32_t size) | |
23721387 SW |
63 | { |
64 | const unsigned char *key = data; | |
65 | uint32_t hash = 0; | |
66 | size_t i; | |
67 | ||
68 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
69 | hash += key[i]; | |
70 | hash += (hash << 10); | |
71 | hash ^= (hash >> 6); | |
72 | } | |
73 | ||
74 | hash += (hash << 3); | |
75 | hash ^= (hash >> 11); | |
76 | hash += (hash << 15); | |
77 | ||
78 | return hash % size; | |
79 | } | |
80 | ||
81 | ||
82 | /* compares address and vid of two backbone gws */ | |
3b300de3 SE |
83 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
84 | const void *data2) | |
23721387 SW |
85 | { |
86 | const void *data1 = container_of(node, struct backbone_gw, | |
87 | hash_entry); | |
88 | ||
89 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
90 | } | |
91 | ||
92 | /* compares address and vid of two claims */ | |
3b300de3 SE |
93 | static int batadv_compare_claim(const struct hlist_node *node, |
94 | const void *data2) | |
23721387 SW |
95 | { |
96 | const void *data1 = container_of(node, struct claim, | |
97 | hash_entry); | |
98 | ||
99 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
100 | } | |
101 | ||
102 | /* free a backbone gw */ | |
3b300de3 | 103 | static void batadv_backbone_gw_free_ref(struct backbone_gw *backbone_gw) |
23721387 SW |
104 | { |
105 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
106 | kfree_rcu(backbone_gw, rcu); | |
107 | } | |
108 | ||
109 | /* finally deinitialize the claim */ | |
3b300de3 | 110 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 SW |
111 | { |
112 | struct claim *claim; | |
113 | ||
114 | claim = container_of(rcu, struct claim, rcu); | |
115 | ||
3b300de3 | 116 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
117 | kfree(claim); |
118 | } | |
119 | ||
120 | /* free a claim, call claim_free_rcu if its the last reference */ | |
3b300de3 | 121 | static void batadv_claim_free_ref(struct claim *claim) |
23721387 SW |
122 | { |
123 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 124 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
125 | } |
126 | ||
9cfc7bd6 | 127 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
128 | * @data: search data (may be local/static data) |
129 | * | |
130 | * looks for a claim in the hash, and returns it if found | |
131 | * or NULL otherwise. | |
132 | */ | |
3b300de3 SE |
133 | static struct claim *batadv_claim_hash_find(struct bat_priv *bat_priv, |
134 | struct claim *data) | |
23721387 SW |
135 | { |
136 | struct hashtable_t *hash = bat_priv->claim_hash; | |
137 | struct hlist_head *head; | |
138 | struct hlist_node *node; | |
139 | struct claim *claim; | |
140 | struct claim *claim_tmp = NULL; | |
141 | int index; | |
142 | ||
143 | if (!hash) | |
144 | return NULL; | |
145 | ||
3b300de3 | 146 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
147 | head = &hash->table[index]; |
148 | ||
149 | rcu_read_lock(); | |
150 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
3b300de3 | 151 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
152 | continue; |
153 | ||
154 | if (!atomic_inc_not_zero(&claim->refcount)) | |
155 | continue; | |
156 | ||
157 | claim_tmp = claim; | |
158 | break; | |
159 | } | |
160 | rcu_read_unlock(); | |
161 | ||
162 | return claim_tmp; | |
163 | } | |
164 | ||
9cfc7bd6 | 165 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
166 | * @addr: the address of the originator |
167 | * @vid: the VLAN ID | |
168 | * | |
169 | * looks for a claim in the hash, and returns it if found | |
170 | * or NULL otherwise. | |
171 | */ | |
3b300de3 SE |
172 | static struct backbone_gw *batadv_backbone_hash_find(struct bat_priv *bat_priv, |
173 | uint8_t *addr, short vid) | |
23721387 SW |
174 | { |
175 | struct hashtable_t *hash = bat_priv->backbone_hash; | |
176 | struct hlist_head *head; | |
177 | struct hlist_node *node; | |
178 | struct backbone_gw search_entry, *backbone_gw; | |
179 | struct backbone_gw *backbone_gw_tmp = NULL; | |
180 | int index; | |
181 | ||
182 | if (!hash) | |
183 | return NULL; | |
184 | ||
185 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
186 | search_entry.vid = vid; | |
187 | ||
3b300de3 | 188 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
189 | head = &hash->table[index]; |
190 | ||
191 | rcu_read_lock(); | |
192 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
3b300de3 SE |
193 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
194 | &search_entry)) | |
23721387 SW |
195 | continue; |
196 | ||
197 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
198 | continue; | |
199 | ||
200 | backbone_gw_tmp = backbone_gw; | |
201 | break; | |
202 | } | |
203 | rcu_read_unlock(); | |
204 | ||
205 | return backbone_gw_tmp; | |
206 | } | |
207 | ||
208 | /* delete all claims for a backbone */ | |
3b300de3 | 209 | static void batadv_bla_del_backbone_claims(struct backbone_gw *backbone_gw) |
23721387 SW |
210 | { |
211 | struct hashtable_t *hash; | |
212 | struct hlist_node *node, *node_tmp; | |
213 | struct hlist_head *head; | |
214 | struct claim *claim; | |
215 | int i; | |
216 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
217 | ||
218 | hash = backbone_gw->bat_priv->claim_hash; | |
219 | if (!hash) | |
220 | return; | |
221 | ||
222 | for (i = 0; i < hash->size; i++) { | |
223 | head = &hash->table[i]; | |
224 | list_lock = &hash->list_locks[i]; | |
225 | ||
226 | spin_lock_bh(list_lock); | |
227 | hlist_for_each_entry_safe(claim, node, node_tmp, | |
228 | head, hash_entry) { | |
229 | ||
230 | if (claim->backbone_gw != backbone_gw) | |
231 | continue; | |
232 | ||
3b300de3 | 233 | batadv_claim_free_ref(claim); |
23721387 SW |
234 | hlist_del_rcu(node); |
235 | } | |
236 | spin_unlock_bh(list_lock); | |
237 | } | |
238 | ||
239 | /* all claims gone, intialize CRC */ | |
240 | backbone_gw->crc = BLA_CRC_INIT; | |
241 | } | |
242 | ||
9cfc7bd6 | 243 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
244 | * @orig: the mac address to be announced within the claim |
245 | * @vid: the VLAN ID | |
246 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
247 | * | |
248 | * sends a claim frame according to the provided info. | |
249 | */ | |
3b300de3 SE |
250 | static void batadv_bla_send_claim(struct bat_priv *bat_priv, uint8_t *mac, |
251 | short vid, int claimtype) | |
23721387 SW |
252 | { |
253 | struct sk_buff *skb; | |
254 | struct ethhdr *ethhdr; | |
255 | struct hard_iface *primary_if; | |
256 | struct net_device *soft_iface; | |
257 | uint8_t *hw_src; | |
258 | struct bla_claim_dst local_claim_dest; | |
3e2f1a1b | 259 | __be32 zeroip = 0; |
23721387 | 260 | |
e5d89254 | 261 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
262 | if (!primary_if) |
263 | return; | |
264 | ||
38ef3d1d SW |
265 | memcpy(&local_claim_dest, &bat_priv->claim_dest, |
266 | sizeof(local_claim_dest)); | |
23721387 SW |
267 | local_claim_dest.type = claimtype; |
268 | ||
269 | soft_iface = primary_if->soft_iface; | |
270 | ||
271 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
272 | /* IP DST: 0.0.0.0 */ | |
273 | zeroip, | |
274 | primary_if->soft_iface, | |
275 | /* IP SRC: 0.0.0.0 */ | |
276 | zeroip, | |
277 | /* Ethernet DST: Broadcast */ | |
278 | NULL, | |
279 | /* Ethernet SRC/HW SRC: originator mac */ | |
280 | primary_if->net_dev->dev_addr, | |
281 | /* HW DST: FF:43:05:XX:00:00 | |
282 | * with XX = claim type | |
38ef3d1d | 283 | * and YY:YY = group id |
23721387 SW |
284 | */ |
285 | (uint8_t *)&local_claim_dest); | |
286 | ||
287 | if (!skb) | |
288 | goto out; | |
289 | ||
290 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 291 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
292 | |
293 | /* now we pretend that the client would have sent this ... */ | |
294 | switch (claimtype) { | |
295 | case CLAIM_TYPE_ADD: | |
296 | /* normal claim frame | |
297 | * set Ethernet SRC to the clients mac | |
298 | */ | |
299 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
1eda58bf SE |
300 | batadv_dbg(DBG_BLA, bat_priv, |
301 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); | |
23721387 SW |
302 | break; |
303 | case CLAIM_TYPE_DEL: | |
304 | /* unclaim frame | |
305 | * set HW SRC to the clients mac | |
306 | */ | |
307 | memcpy(hw_src, mac, ETH_ALEN); | |
1eda58bf SE |
308 | batadv_dbg(DBG_BLA, bat_priv, |
309 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, | |
310 | vid); | |
23721387 SW |
311 | break; |
312 | case CLAIM_TYPE_ANNOUNCE: | |
313 | /* announcement frame | |
314 | * set HW SRC to the special mac containg the crc | |
315 | */ | |
316 | memcpy(hw_src, mac, ETH_ALEN); | |
1eda58bf SE |
317 | batadv_dbg(DBG_BLA, bat_priv, |
318 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", | |
319 | ethhdr->h_source, vid); | |
23721387 SW |
320 | break; |
321 | case CLAIM_TYPE_REQUEST: | |
322 | /* request frame | |
323 | * set HW SRC to the special mac containg the crc | |
324 | */ | |
325 | memcpy(hw_src, mac, ETH_ALEN); | |
326 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
1eda58bf SE |
327 | batadv_dbg(DBG_BLA, bat_priv, |
328 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", | |
329 | ethhdr->h_source, ethhdr->h_dest, vid); | |
23721387 SW |
330 | break; |
331 | ||
332 | } | |
333 | ||
334 | if (vid != -1) | |
335 | skb = vlan_insert_tag(skb, vid); | |
336 | ||
337 | skb_reset_mac_header(skb); | |
338 | skb->protocol = eth_type_trans(skb, soft_iface); | |
339 | bat_priv->stats.rx_packets++; | |
0d125074 | 340 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN; |
23721387 SW |
341 | soft_iface->last_rx = jiffies; |
342 | ||
343 | netif_rx(skb); | |
344 | out: | |
345 | if (primary_if) | |
e5d89254 | 346 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
347 | } |
348 | ||
9cfc7bd6 | 349 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
350 | * @orig: the mac address of the originator |
351 | * @vid: the VLAN ID | |
352 | * | |
353 | * searches for the backbone gw or creates a new one if it could not | |
354 | * be found. | |
355 | */ | |
3b300de3 SE |
356 | static struct backbone_gw *batadv_bla_get_backbone_gw(struct bat_priv *bat_priv, |
357 | uint8_t *orig, short vid) | |
23721387 SW |
358 | { |
359 | struct backbone_gw *entry; | |
20ff9d59 | 360 | struct orig_node *orig_node; |
23721387 SW |
361 | int hash_added; |
362 | ||
3b300de3 | 363 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
364 | |
365 | if (entry) | |
366 | return entry; | |
367 | ||
1eda58bf SE |
368 | batadv_dbg(DBG_BLA, bat_priv, |
369 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", | |
370 | orig, vid); | |
23721387 SW |
371 | |
372 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
373 | if (!entry) | |
374 | return NULL; | |
375 | ||
376 | entry->vid = vid; | |
377 | entry->lasttime = jiffies; | |
378 | entry->crc = BLA_CRC_INIT; | |
379 | entry->bat_priv = bat_priv; | |
380 | atomic_set(&entry->request_sent, 0); | |
381 | memcpy(entry->orig, orig, ETH_ALEN); | |
382 | ||
383 | /* one for the hash, one for returning */ | |
384 | atomic_set(&entry->refcount, 2); | |
385 | ||
c0a55929 | 386 | hash_added = batadv_hash_add(bat_priv->backbone_hash, |
3b300de3 SE |
387 | batadv_compare_backbone_gw, |
388 | batadv_choose_backbone_gw, entry, | |
389 | &entry->hash_entry); | |
23721387 SW |
390 | |
391 | if (unlikely(hash_added != 0)) { | |
392 | /* hash failed, free the structure */ | |
393 | kfree(entry); | |
394 | return NULL; | |
395 | } | |
396 | ||
20ff9d59 | 397 | /* this is a gateway now, remove any tt entries */ |
da641193 | 398 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 399 | if (orig_node) { |
08c36d3e SE |
400 | batadv_tt_global_del_orig(bat_priv, orig_node, |
401 | "became a backbone gateway"); | |
7d211efc | 402 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 403 | } |
23721387 SW |
404 | return entry; |
405 | } | |
406 | ||
407 | /* update or add the own backbone gw to make sure we announce | |
408 | * where we receive other backbone gws | |
409 | */ | |
3b300de3 SE |
410 | static void batadv_bla_update_own_backbone_gw(struct bat_priv *bat_priv, |
411 | struct hard_iface *primary_if, | |
412 | short vid) | |
23721387 SW |
413 | { |
414 | struct backbone_gw *backbone_gw; | |
415 | ||
3b300de3 SE |
416 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
417 | primary_if->net_dev->dev_addr, | |
418 | vid); | |
23721387 SW |
419 | if (unlikely(!backbone_gw)) |
420 | return; | |
421 | ||
422 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 423 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
424 | } |
425 | ||
9cfc7bd6 | 426 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
427 | * @vid: the vid where the request came on |
428 | * | |
429 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
430 | * to allow the requester another check if the CRC is correct now. | |
431 | */ | |
3b300de3 SE |
432 | static void batadv_bla_answer_request(struct bat_priv *bat_priv, |
433 | struct hard_iface *primary_if, short vid) | |
23721387 SW |
434 | { |
435 | struct hlist_node *node; | |
436 | struct hlist_head *head; | |
437 | struct hashtable_t *hash; | |
438 | struct claim *claim; | |
439 | struct backbone_gw *backbone_gw; | |
440 | int i; | |
441 | ||
1eda58bf SE |
442 | batadv_dbg(DBG_BLA, bat_priv, |
443 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); | |
23721387 | 444 | |
3b300de3 SE |
445 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
446 | primary_if->net_dev->dev_addr, | |
447 | vid); | |
23721387 SW |
448 | if (!backbone_gw) |
449 | return; | |
450 | ||
451 | hash = bat_priv->claim_hash; | |
452 | for (i = 0; i < hash->size; i++) { | |
453 | head = &hash->table[i]; | |
454 | ||
455 | rcu_read_lock(); | |
456 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
457 | /* only own claims are interesting */ | |
458 | if (claim->backbone_gw != backbone_gw) | |
459 | continue; | |
460 | ||
3b300de3 SE |
461 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
462 | CLAIM_TYPE_ADD); | |
23721387 SW |
463 | } |
464 | rcu_read_unlock(); | |
465 | } | |
466 | ||
467 | /* finally, send an announcement frame */ | |
3b300de3 SE |
468 | batadv_bla_send_announce(bat_priv, backbone_gw); |
469 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
470 | } |
471 | ||
9cfc7bd6 | 472 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
473 | * |
474 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
475 | * After the request, it will repeat all of his own claims and finally | |
476 | * send an announcement claim with which we can check again. | |
477 | */ | |
3b300de3 | 478 | static void batadv_bla_send_request(struct backbone_gw *backbone_gw) |
23721387 SW |
479 | { |
480 | /* first, remove all old entries */ | |
3b300de3 | 481 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 482 | |
1eda58bf SE |
483 | batadv_dbg(DBG_BLA, backbone_gw->bat_priv, "Sending REQUEST to %pM\n", |
484 | backbone_gw->orig); | |
23721387 SW |
485 | |
486 | /* send request */ | |
3b300de3 SE |
487 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
488 | backbone_gw->vid, CLAIM_TYPE_REQUEST); | |
23721387 SW |
489 | |
490 | /* no local broadcasts should be sent or received, for now. */ | |
491 | if (!atomic_read(&backbone_gw->request_sent)) { | |
492 | atomic_inc(&backbone_gw->bat_priv->bla_num_requests); | |
493 | atomic_set(&backbone_gw->request_sent, 1); | |
494 | } | |
495 | } | |
496 | ||
9cfc7bd6 | 497 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
498 | * @backbone_gw: our backbone gateway which should be announced |
499 | * | |
500 | * This function sends an announcement. It is called from multiple | |
501 | * places. | |
502 | */ | |
3b300de3 SE |
503 | static void batadv_bla_send_announce(struct bat_priv *bat_priv, |
504 | struct backbone_gw *backbone_gw) | |
23721387 SW |
505 | { |
506 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 507 | __be16 crc; |
23721387 | 508 | |
3b300de3 | 509 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 510 | crc = htons(backbone_gw->crc); |
1a5852d8 | 511 | memcpy(&mac[4], &crc, 2); |
23721387 | 512 | |
3b300de3 SE |
513 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
514 | CLAIM_TYPE_ANNOUNCE); | |
23721387 SW |
515 | |
516 | } | |
517 | ||
9cfc7bd6 | 518 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
519 | * @mac: the mac address of the claim |
520 | * @vid: the VLAN ID of the frame | |
521 | * @backbone_gw: the backbone gateway which claims it | |
522 | * | |
523 | * Adds a claim in the claim hash. | |
524 | */ | |
3b300de3 SE |
525 | static void batadv_bla_add_claim(struct bat_priv *bat_priv, const uint8_t *mac, |
526 | const short vid, | |
527 | struct backbone_gw *backbone_gw) | |
23721387 SW |
528 | { |
529 | struct claim *claim; | |
530 | struct claim search_claim; | |
531 | int hash_added; | |
532 | ||
533 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
534 | search_claim.vid = vid; | |
3b300de3 | 535 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
536 | |
537 | /* create a new claim entry if it does not exist yet. */ | |
538 | if (!claim) { | |
539 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
540 | if (!claim) | |
541 | return; | |
542 | ||
543 | memcpy(claim->addr, mac, ETH_ALEN); | |
544 | claim->vid = vid; | |
545 | claim->lasttime = jiffies; | |
546 | claim->backbone_gw = backbone_gw; | |
547 | ||
548 | atomic_set(&claim->refcount, 2); | |
1eda58bf SE |
549 | batadv_dbg(DBG_BLA, bat_priv, |
550 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", | |
551 | mac, vid); | |
c0a55929 | 552 | hash_added = batadv_hash_add(bat_priv->claim_hash, |
3b300de3 SE |
553 | batadv_compare_claim, |
554 | batadv_choose_claim, claim, | |
555 | &claim->hash_entry); | |
23721387 SW |
556 | |
557 | if (unlikely(hash_added != 0)) { | |
558 | /* only local changes happened. */ | |
559 | kfree(claim); | |
560 | return; | |
561 | } | |
562 | } else { | |
563 | claim->lasttime = jiffies; | |
564 | if (claim->backbone_gw == backbone_gw) | |
565 | /* no need to register a new backbone */ | |
566 | goto claim_free_ref; | |
567 | ||
1eda58bf SE |
568 | batadv_dbg(DBG_BLA, bat_priv, |
569 | "bla_add_claim(): changing ownership for %pM, vid %d\n", | |
570 | mac, vid); | |
23721387 SW |
571 | |
572 | claim->backbone_gw->crc ^= | |
573 | crc16(0, claim->addr, ETH_ALEN); | |
3b300de3 | 574 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
575 | |
576 | } | |
577 | /* set (new) backbone gw */ | |
578 | atomic_inc(&backbone_gw->refcount); | |
579 | claim->backbone_gw = backbone_gw; | |
580 | ||
581 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
582 | backbone_gw->lasttime = jiffies; | |
583 | ||
584 | claim_free_ref: | |
3b300de3 | 585 | batadv_claim_free_ref(claim); |
23721387 SW |
586 | } |
587 | ||
588 | /* Delete a claim from the claim hash which has the | |
589 | * given mac address and vid. | |
590 | */ | |
3b300de3 SE |
591 | static void batadv_bla_del_claim(struct bat_priv *bat_priv, const uint8_t *mac, |
592 | const short vid) | |
23721387 SW |
593 | { |
594 | struct claim search_claim, *claim; | |
595 | ||
596 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
597 | search_claim.vid = vid; | |
3b300de3 | 598 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
599 | if (!claim) |
600 | return; | |
601 | ||
1eda58bf SE |
602 | batadv_dbg(DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", mac, |
603 | vid); | |
23721387 | 604 | |
3b300de3 SE |
605 | batadv_hash_remove(bat_priv->claim_hash, batadv_compare_claim, |
606 | batadv_choose_claim, claim); | |
607 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
608 | |
609 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
610 | ||
611 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 612 | batadv_claim_free_ref(claim); |
23721387 SW |
613 | } |
614 | ||
615 | /* check for ANNOUNCE frame, return 1 if handled */ | |
3b300de3 SE |
616 | static int batadv_handle_announce(struct bat_priv *bat_priv, |
617 | uint8_t *an_addr, uint8_t *backbone_addr, | |
618 | short vid) | |
23721387 SW |
619 | { |
620 | struct backbone_gw *backbone_gw; | |
621 | uint16_t crc; | |
622 | ||
3b300de3 | 623 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
624 | return 0; |
625 | ||
3b300de3 | 626 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
627 | |
628 | if (unlikely(!backbone_gw)) | |
629 | return 1; | |
630 | ||
631 | ||
632 | /* handle as ANNOUNCE frame */ | |
633 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 634 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 635 | |
1eda58bf SE |
636 | batadv_dbg(DBG_BLA, bat_priv, |
637 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", | |
638 | vid, backbone_gw->orig, crc); | |
23721387 SW |
639 | |
640 | if (backbone_gw->crc != crc) { | |
1eda58bf SE |
641 | batadv_dbg(DBG_BLA, backbone_gw->bat_priv, |
642 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", | |
643 | backbone_gw->orig, backbone_gw->vid, | |
644 | backbone_gw->crc, crc); | |
23721387 | 645 | |
3b300de3 | 646 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
647 | } else { |
648 | /* if we have sent a request and the crc was OK, | |
649 | * we can allow traffic again. | |
650 | */ | |
651 | if (atomic_read(&backbone_gw->request_sent)) { | |
652 | atomic_dec(&backbone_gw->bat_priv->bla_num_requests); | |
653 | atomic_set(&backbone_gw->request_sent, 0); | |
654 | } | |
655 | } | |
656 | ||
3b300de3 | 657 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
658 | return 1; |
659 | } | |
660 | ||
661 | /* check for REQUEST frame, return 1 if handled */ | |
3b300de3 SE |
662 | static int batadv_handle_request(struct bat_priv *bat_priv, |
663 | struct hard_iface *primary_if, | |
664 | uint8_t *backbone_addr, | |
665 | struct ethhdr *ethhdr, short vid) | |
23721387 SW |
666 | { |
667 | /* check for REQUEST frame */ | |
1eda58bf | 668 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
669 | return 0; |
670 | ||
671 | /* sanity check, this should not happen on a normal switch, | |
672 | * we ignore it in this case. | |
673 | */ | |
1eda58bf | 674 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
675 | return 1; |
676 | ||
1eda58bf SE |
677 | batadv_dbg(DBG_BLA, bat_priv, |
678 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", | |
679 | vid, ethhdr->h_source); | |
23721387 | 680 | |
3b300de3 | 681 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
682 | return 1; |
683 | } | |
684 | ||
685 | /* check for UNCLAIM frame, return 1 if handled */ | |
3b300de3 SE |
686 | static int batadv_handle_unclaim(struct bat_priv *bat_priv, |
687 | struct hard_iface *primary_if, | |
688 | uint8_t *backbone_addr, | |
689 | uint8_t *claim_addr, short vid) | |
23721387 SW |
690 | { |
691 | struct backbone_gw *backbone_gw; | |
692 | ||
693 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
694 | if (primary_if && batadv_compare_eth(backbone_addr, |
695 | primary_if->net_dev->dev_addr)) | |
3b300de3 SE |
696 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
697 | CLAIM_TYPE_DEL); | |
23721387 | 698 | |
3b300de3 | 699 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
700 | |
701 | if (!backbone_gw) | |
702 | return 1; | |
703 | ||
704 | /* this must be an UNCLAIM frame */ | |
1eda58bf SE |
705 | batadv_dbg(DBG_BLA, bat_priv, |
706 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", | |
707 | claim_addr, vid, backbone_gw->orig); | |
23721387 | 708 | |
3b300de3 SE |
709 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
710 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
711 | return 1; |
712 | } | |
713 | ||
714 | /* check for CLAIM frame, return 1 if handled */ | |
3b300de3 SE |
715 | static int batadv_handle_claim(struct bat_priv *bat_priv, |
716 | struct hard_iface *primary_if, | |
717 | uint8_t *backbone_addr, uint8_t *claim_addr, | |
718 | short vid) | |
23721387 SW |
719 | { |
720 | struct backbone_gw *backbone_gw; | |
721 | ||
722 | /* register the gateway if not yet available, and add the claim. */ | |
723 | ||
3b300de3 | 724 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid); |
23721387 SW |
725 | |
726 | if (unlikely(!backbone_gw)) | |
727 | return 1; | |
728 | ||
729 | /* this must be a CLAIM frame */ | |
3b300de3 | 730 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 731 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 SE |
732 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
733 | CLAIM_TYPE_ADD); | |
23721387 SW |
734 | |
735 | /* TODO: we could call something like tt_local_del() here. */ | |
736 | ||
3b300de3 | 737 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
738 | return 1; |
739 | } | |
740 | ||
9cfc7bd6 | 741 | /* @bat_priv: the bat priv with all the soft interface information |
38ef3d1d SW |
742 | * @hw_src: the Hardware source in the ARP Header |
743 | * @hw_dst: the Hardware destination in the ARP Header | |
744 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
745 | * | |
746 | * checks if it is a claim packet and if its on the same group. | |
747 | * This function also applies the group ID of the sender | |
748 | * if it is in the same mesh. | |
749 | * | |
750 | * returns: | |
751 | * 2 - if it is a claim packet and on the same group | |
752 | * 1 - if is a claim packet from another group | |
753 | * 0 - if it is not a claim packet | |
754 | */ | |
3b300de3 SE |
755 | static int batadv_check_claim_group(struct bat_priv *bat_priv, |
756 | struct hard_iface *primary_if, | |
757 | uint8_t *hw_src, uint8_t *hw_dst, | |
758 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
759 | { |
760 | uint8_t *backbone_addr; | |
761 | struct orig_node *orig_node; | |
762 | struct bla_claim_dst *bla_dst, *bla_dst_own; | |
763 | ||
764 | bla_dst = (struct bla_claim_dst *)hw_dst; | |
765 | bla_dst_own = &bat_priv->claim_dest; | |
766 | ||
767 | /* check if it is a claim packet in general */ | |
768 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
769 | sizeof(bla_dst->magic)) != 0) | |
770 | return 0; | |
771 | ||
772 | /* if announcement packet, use the source, | |
773 | * otherwise assume it is in the hw_src | |
774 | */ | |
775 | switch (bla_dst->type) { | |
776 | case CLAIM_TYPE_ADD: | |
777 | backbone_addr = hw_src; | |
778 | break; | |
779 | case CLAIM_TYPE_REQUEST: | |
780 | case CLAIM_TYPE_ANNOUNCE: | |
781 | case CLAIM_TYPE_DEL: | |
782 | backbone_addr = ethhdr->h_source; | |
783 | break; | |
784 | default: | |
785 | return 0; | |
786 | } | |
787 | ||
788 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 789 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
790 | return 0; |
791 | ||
792 | /* if its already the same group, it is fine. */ | |
793 | if (bla_dst->group == bla_dst_own->group) | |
794 | return 2; | |
795 | ||
796 | /* lets see if this originator is in our mesh */ | |
da641193 | 797 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
798 | |
799 | /* dont accept claims from gateways which are not in | |
800 | * the same mesh or group. | |
801 | */ | |
802 | if (!orig_node) | |
803 | return 1; | |
804 | ||
805 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
806 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
1eda58bf SE |
807 | batadv_dbg(DBG_BLA, bat_priv, |
808 | "taking other backbones claim group: %04x\n", | |
809 | ntohs(bla_dst->group)); | |
38ef3d1d SW |
810 | bla_dst_own->group = bla_dst->group; |
811 | } | |
812 | ||
7d211efc | 813 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
814 | |
815 | return 2; | |
816 | } | |
817 | ||
818 | ||
9cfc7bd6 | 819 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
820 | * @skb: the frame to be checked |
821 | * | |
822 | * Check if this is a claim frame, and process it accordingly. | |
823 | * | |
824 | * returns 1 if it was a claim frame, otherwise return 0 to | |
825 | * tell the callee that it can use the frame on its own. | |
826 | */ | |
3b300de3 SE |
827 | static int batadv_bla_process_claim(struct bat_priv *bat_priv, |
828 | struct hard_iface *primary_if, | |
829 | struct sk_buff *skb) | |
23721387 SW |
830 | { |
831 | struct ethhdr *ethhdr; | |
832 | struct vlan_ethhdr *vhdr; | |
833 | struct arphdr *arphdr; | |
834 | uint8_t *hw_src, *hw_dst; | |
835 | struct bla_claim_dst *bla_dst; | |
836 | uint16_t proto; | |
837 | int headlen; | |
838 | short vid = -1; | |
38ef3d1d | 839 | int ret; |
23721387 SW |
840 | |
841 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
842 | ||
843 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
844 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
845 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
846 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
847 | headlen = sizeof(*vhdr); | |
848 | } else { | |
849 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 850 | headlen = ETH_HLEN; |
23721387 SW |
851 | } |
852 | ||
853 | if (proto != ETH_P_ARP) | |
854 | return 0; /* not a claim frame */ | |
855 | ||
856 | /* this must be a ARP frame. check if it is a claim. */ | |
857 | ||
858 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
859 | return 0; | |
860 | ||
861 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
862 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
863 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
864 | ||
865 | /* Check whether the ARP frame carries a valid | |
866 | * IP information | |
867 | */ | |
23721387 SW |
868 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
869 | return 0; | |
870 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
871 | return 0; | |
872 | if (arphdr->ar_hln != ETH_ALEN) | |
873 | return 0; | |
874 | if (arphdr->ar_pln != 4) | |
875 | return 0; | |
876 | ||
877 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
878 | hw_dst = hw_src + ETH_ALEN + 4; | |
879 | bla_dst = (struct bla_claim_dst *)hw_dst; | |
880 | ||
881 | /* check if it is a claim frame. */ | |
3b300de3 SE |
882 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
883 | ethhdr); | |
38ef3d1d | 884 | if (ret == 1) |
1eda58bf SE |
885 | batadv_dbg(DBG_BLA, bat_priv, |
886 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", | |
887 | ethhdr->h_source, vid, hw_src, hw_dst); | |
38ef3d1d SW |
888 | |
889 | if (ret < 2) | |
890 | return ret; | |
23721387 SW |
891 | |
892 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 893 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
894 | |
895 | /* check for the different types of claim frames ... */ | |
896 | switch (bla_dst->type) { | |
897 | case CLAIM_TYPE_ADD: | |
3b300de3 SE |
898 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
899 | ethhdr->h_source, vid)) | |
23721387 SW |
900 | return 1; |
901 | break; | |
902 | case CLAIM_TYPE_DEL: | |
3b300de3 SE |
903 | if (batadv_handle_unclaim(bat_priv, primary_if, |
904 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
905 | return 1; |
906 | break; | |
907 | ||
908 | case CLAIM_TYPE_ANNOUNCE: | |
3b300de3 SE |
909 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
910 | vid)) | |
23721387 SW |
911 | return 1; |
912 | break; | |
913 | case CLAIM_TYPE_REQUEST: | |
3b300de3 SE |
914 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
915 | vid)) | |
23721387 SW |
916 | return 1; |
917 | break; | |
918 | } | |
919 | ||
1eda58bf SE |
920 | batadv_dbg(DBG_BLA, bat_priv, |
921 | "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", | |
922 | ethhdr->h_source, vid, hw_src, hw_dst); | |
23721387 SW |
923 | return 1; |
924 | } | |
925 | ||
926 | /* Check when we last heard from other nodes, and remove them in case of | |
927 | * a time out, or clean all backbone gws if now is set. | |
928 | */ | |
3b300de3 | 929 | static void batadv_bla_purge_backbone_gw(struct bat_priv *bat_priv, int now) |
23721387 SW |
930 | { |
931 | struct backbone_gw *backbone_gw; | |
932 | struct hlist_node *node, *node_tmp; | |
933 | struct hlist_head *head; | |
934 | struct hashtable_t *hash; | |
935 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
936 | int i; | |
937 | ||
938 | hash = bat_priv->backbone_hash; | |
939 | if (!hash) | |
940 | return; | |
941 | ||
942 | for (i = 0; i < hash->size; i++) { | |
943 | head = &hash->table[i]; | |
944 | list_lock = &hash->list_locks[i]; | |
945 | ||
946 | spin_lock_bh(list_lock); | |
947 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
948 | head, hash_entry) { | |
949 | if (now) | |
950 | goto purge_now; | |
1eda58bf SE |
951 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
952 | BLA_BACKBONE_TIMEOUT)) | |
23721387 SW |
953 | continue; |
954 | ||
1eda58bf SE |
955 | batadv_dbg(DBG_BLA, backbone_gw->bat_priv, |
956 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", | |
957 | backbone_gw->orig); | |
23721387 SW |
958 | |
959 | purge_now: | |
960 | /* don't wait for the pending request anymore */ | |
961 | if (atomic_read(&backbone_gw->request_sent)) | |
962 | atomic_dec(&bat_priv->bla_num_requests); | |
963 | ||
3b300de3 | 964 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 SW |
965 | |
966 | hlist_del_rcu(node); | |
3b300de3 | 967 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
968 | } |
969 | spin_unlock_bh(list_lock); | |
970 | } | |
971 | } | |
972 | ||
9cfc7bd6 | 973 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
974 | * @primary_if: the selected primary interface, may be NULL if now is set |
975 | * @now: whether the whole hash shall be wiped now | |
976 | * | |
977 | * Check when we heard last time from our own claims, and remove them in case of | |
978 | * a time out, or clean all claims if now is set | |
979 | */ | |
3b300de3 SE |
980 | static void batadv_bla_purge_claims(struct bat_priv *bat_priv, |
981 | struct hard_iface *primary_if, int now) | |
23721387 SW |
982 | { |
983 | struct claim *claim; | |
984 | struct hlist_node *node; | |
985 | struct hlist_head *head; | |
986 | struct hashtable_t *hash; | |
987 | int i; | |
988 | ||
989 | hash = bat_priv->claim_hash; | |
990 | if (!hash) | |
991 | return; | |
992 | ||
993 | for (i = 0; i < hash->size; i++) { | |
994 | head = &hash->table[i]; | |
995 | ||
996 | rcu_read_lock(); | |
997 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
998 | if (now) | |
999 | goto purge_now; | |
1eda58bf SE |
1000 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1001 | primary_if->net_dev->dev_addr)) | |
23721387 | 1002 | continue; |
1eda58bf SE |
1003 | if (!batadv_has_timed_out(claim->lasttime, |
1004 | BLA_CLAIM_TIMEOUT)) | |
23721387 SW |
1005 | continue; |
1006 | ||
1eda58bf SE |
1007 | batadv_dbg(DBG_BLA, bat_priv, |
1008 | "bla_purge_claims(): %pM, vid %d, time out\n", | |
1009 | claim->addr, claim->vid); | |
23721387 SW |
1010 | |
1011 | purge_now: | |
3b300de3 SE |
1012 | batadv_handle_unclaim(bat_priv, primary_if, |
1013 | claim->backbone_gw->orig, | |
1014 | claim->addr, claim->vid); | |
23721387 SW |
1015 | } |
1016 | rcu_read_unlock(); | |
1017 | } | |
1018 | } | |
1019 | ||
9cfc7bd6 | 1020 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1021 | * @primary_if: the new selected primary_if |
1022 | * @oldif: the old primary interface, may be NULL | |
1023 | * | |
1024 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1025 | */ |
08adf151 SE |
1026 | void batadv_bla_update_orig_address(struct bat_priv *bat_priv, |
1027 | struct hard_iface *primary_if, | |
1028 | struct hard_iface *oldif) | |
23721387 SW |
1029 | { |
1030 | struct backbone_gw *backbone_gw; | |
1031 | struct hlist_node *node; | |
1032 | struct hlist_head *head; | |
1033 | struct hashtable_t *hash; | |
1034 | int i; | |
1035 | ||
38ef3d1d SW |
1036 | /* reset bridge loop avoidance group id */ |
1037 | bat_priv->claim_dest.group = | |
1038 | htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); | |
1039 | ||
23721387 | 1040 | if (!oldif) { |
3b300de3 SE |
1041 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1042 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1043 | return; |
1044 | } | |
1045 | ||
1046 | hash = bat_priv->backbone_hash; | |
1047 | if (!hash) | |
1048 | return; | |
1049 | ||
1050 | for (i = 0; i < hash->size; i++) { | |
1051 | head = &hash->table[i]; | |
1052 | ||
1053 | rcu_read_lock(); | |
1054 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1055 | /* own orig still holds the old value. */ | |
1eda58bf SE |
1056 | if (!batadv_compare_eth(backbone_gw->orig, |
1057 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1058 | continue; |
1059 | ||
1060 | memcpy(backbone_gw->orig, | |
1061 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1062 | /* send an announce frame so others will ask for our | |
1063 | * claims and update their tables. | |
1064 | */ | |
3b300de3 | 1065 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1066 | } |
1067 | rcu_read_unlock(); | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | ||
1072 | ||
1073 | /* (re)start the timer */ | |
3b300de3 | 1074 | static void batadv_bla_start_timer(struct bat_priv *bat_priv) |
23721387 | 1075 | { |
3b300de3 | 1076 | INIT_DELAYED_WORK(&bat_priv->bla_work, batadv_bla_periodic_work); |
3193e8fd | 1077 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work, |
23721387 SW |
1078 | msecs_to_jiffies(BLA_PERIOD_LENGTH)); |
1079 | } | |
1080 | ||
1081 | /* periodic work to do: | |
1082 | * * purge structures when they are too old | |
1083 | * * send announcements | |
1084 | */ | |
3b300de3 | 1085 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 SW |
1086 | { |
1087 | struct delayed_work *delayed_work = | |
1088 | container_of(work, struct delayed_work, work); | |
1089 | struct bat_priv *bat_priv = | |
1090 | container_of(delayed_work, struct bat_priv, bla_work); | |
1091 | struct hlist_node *node; | |
1092 | struct hlist_head *head; | |
1093 | struct backbone_gw *backbone_gw; | |
1094 | struct hashtable_t *hash; | |
1095 | struct hard_iface *primary_if; | |
1096 | int i; | |
1097 | ||
e5d89254 | 1098 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1099 | if (!primary_if) |
1100 | goto out; | |
1101 | ||
3b300de3 SE |
1102 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1103 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1104 | |
1105 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1106 | goto out; | |
1107 | ||
1108 | hash = bat_priv->backbone_hash; | |
1109 | if (!hash) | |
1110 | goto out; | |
1111 | ||
1112 | for (i = 0; i < hash->size; i++) { | |
1113 | head = &hash->table[i]; | |
1114 | ||
1115 | rcu_read_lock(); | |
1116 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf SE |
1117 | if (!batadv_compare_eth(backbone_gw->orig, |
1118 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1119 | continue; |
1120 | ||
1121 | backbone_gw->lasttime = jiffies; | |
1122 | ||
3b300de3 | 1123 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1124 | } |
1125 | rcu_read_unlock(); | |
1126 | } | |
1127 | out: | |
1128 | if (primary_if) | |
e5d89254 | 1129 | batadv_hardif_free_ref(primary_if); |
23721387 | 1130 | |
3b300de3 | 1131 | batadv_bla_start_timer(bat_priv); |
23721387 SW |
1132 | } |
1133 | ||
5d52dad2 SE |
1134 | /* The hash for claim and backbone hash receive the same key because they |
1135 | * are getting initialized by hash_new with the same key. Reinitializing | |
1136 | * them with to different keys to allow nested locking without generating | |
1137 | * lockdep warnings | |
1138 | */ | |
3b300de3 SE |
1139 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1140 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1141 | |
23721387 | 1142 | /* initialize all bla structures */ |
08adf151 | 1143 | int batadv_bla_init(struct bat_priv *bat_priv) |
23721387 | 1144 | { |
fe2da6ff | 1145 | int i; |
38ef3d1d SW |
1146 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
1147 | struct hard_iface *primary_if; | |
fe2da6ff | 1148 | |
1eda58bf | 1149 | batadv_dbg(DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1150 | |
38ef3d1d SW |
1151 | /* setting claim destination address */ |
1152 | memcpy(&bat_priv->claim_dest.magic, claim_dest, 3); | |
1153 | bat_priv->claim_dest.type = 0; | |
e5d89254 | 1154 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d SW |
1155 | if (primary_if) { |
1156 | bat_priv->claim_dest.group = | |
1157 | htons(crc16(0, primary_if->net_dev->dev_addr, | |
1158 | ETH_ALEN)); | |
e5d89254 | 1159 | batadv_hardif_free_ref(primary_if); |
38ef3d1d SW |
1160 | } else { |
1161 | bat_priv->claim_dest.group = 0; /* will be set later */ | |
1162 | } | |
1163 | ||
fe2da6ff SW |
1164 | /* initialize the duplicate list */ |
1165 | for (i = 0; i < DUPLIST_SIZE; i++) | |
1166 | bat_priv->bcast_duplist[i].entrytime = | |
1167 | jiffies - msecs_to_jiffies(DUPLIST_TIMEOUT); | |
1168 | bat_priv->bcast_duplist_curr = 0; | |
1169 | ||
23721387 | 1170 | if (bat_priv->claim_hash) |
5346c35e | 1171 | return 0; |
23721387 | 1172 | |
1a8eaf07 SE |
1173 | bat_priv->claim_hash = batadv_hash_new(128); |
1174 | bat_priv->backbone_hash = batadv_hash_new(32); | |
23721387 SW |
1175 | |
1176 | if (!bat_priv->claim_hash || !bat_priv->backbone_hash) | |
5346c35e | 1177 | return -ENOMEM; |
23721387 | 1178 | |
5d52dad2 | 1179 | batadv_hash_set_lock_class(bat_priv->claim_hash, |
3b300de3 | 1180 | &batadv_claim_hash_lock_class_key); |
5d52dad2 | 1181 | batadv_hash_set_lock_class(bat_priv->backbone_hash, |
3b300de3 | 1182 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1183 | |
1eda58bf | 1184 | batadv_dbg(DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1185 | |
3b300de3 | 1186 | batadv_bla_start_timer(bat_priv); |
5346c35e | 1187 | return 0; |
23721387 SW |
1188 | } |
1189 | ||
9cfc7bd6 | 1190 | /* @bat_priv: the bat priv with all the soft interface information |
fe2da6ff SW |
1191 | * @bcast_packet: originator mac address |
1192 | * @hdr_size: maximum length of the frame | |
1193 | * | |
1194 | * check if it is on our broadcast list. Another gateway might | |
1195 | * have sent the same packet because it is connected to the same backbone, | |
1196 | * so we have to remove this duplicate. | |
1197 | * | |
1198 | * This is performed by checking the CRC, which will tell us | |
1199 | * with a good chance that it is the same packet. If it is furthermore | |
1200 | * sent by another host, drop it. We allow equal packets from | |
1201 | * the same host however as this might be intended. | |
9cfc7bd6 | 1202 | */ |
08adf151 SE |
1203 | int batadv_bla_check_bcast_duplist(struct bat_priv *bat_priv, |
1204 | struct bcast_packet *bcast_packet, | |
1205 | int hdr_size) | |
fe2da6ff SW |
1206 | { |
1207 | int i, length, curr; | |
1208 | uint8_t *content; | |
1209 | uint16_t crc; | |
1210 | struct bcast_duplist_entry *entry; | |
1211 | ||
1212 | length = hdr_size - sizeof(*bcast_packet); | |
1213 | content = (uint8_t *)bcast_packet; | |
1214 | content += sizeof(*bcast_packet); | |
1215 | ||
1216 | /* calculate the crc ... */ | |
1217 | crc = crc16(0, content, length); | |
1218 | ||
1219 | for (i = 0 ; i < DUPLIST_SIZE; i++) { | |
1220 | curr = (bat_priv->bcast_duplist_curr + i) % DUPLIST_SIZE; | |
1221 | entry = &bat_priv->bcast_duplist[curr]; | |
1222 | ||
1223 | /* we can stop searching if the entry is too old ; | |
1224 | * later entries will be even older | |
1225 | */ | |
1eda58bf | 1226 | if (batadv_has_timed_out(entry->entrytime, DUPLIST_TIMEOUT)) |
fe2da6ff SW |
1227 | break; |
1228 | ||
1229 | if (entry->crc != crc) | |
1230 | continue; | |
1231 | ||
1eda58bf | 1232 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1233 | continue; |
1234 | ||
1235 | /* this entry seems to match: same crc, not too old, | |
1236 | * and from another gw. therefore return 1 to forbid it. | |
1237 | */ | |
1238 | return 1; | |
1239 | } | |
1240 | /* not found, add a new entry (overwrite the oldest entry) */ | |
1241 | curr = (bat_priv->bcast_duplist_curr + DUPLIST_SIZE - 1) % DUPLIST_SIZE; | |
1242 | entry = &bat_priv->bcast_duplist[curr]; | |
1243 | entry->crc = crc; | |
1244 | entry->entrytime = jiffies; | |
1245 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
1246 | bat_priv->bcast_duplist_curr = curr; | |
1247 | ||
1248 | /* allow it, its the first occurence. */ | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | ||
1253 | ||
9cfc7bd6 | 1254 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1255 | * @orig: originator mac address |
1256 | * | |
1257 | * check if the originator is a gateway for any VLAN ID. | |
1258 | * | |
1259 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1260 | */ |
08adf151 | 1261 | int batadv_bla_is_backbone_gw_orig(struct bat_priv *bat_priv, uint8_t *orig) |
20ff9d59 SW |
1262 | { |
1263 | struct hashtable_t *hash = bat_priv->backbone_hash; | |
1264 | struct hlist_head *head; | |
1265 | struct hlist_node *node; | |
1266 | struct backbone_gw *backbone_gw; | |
1267 | int i; | |
1268 | ||
1269 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1270 | return 0; | |
1271 | ||
1272 | if (!hash) | |
1273 | return 0; | |
1274 | ||
1275 | for (i = 0; i < hash->size; i++) { | |
1276 | head = &hash->table[i]; | |
1277 | ||
1278 | rcu_read_lock(); | |
1279 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1eda58bf | 1280 | if (batadv_compare_eth(backbone_gw->orig, orig)) { |
20ff9d59 SW |
1281 | rcu_read_unlock(); |
1282 | return 1; | |
1283 | } | |
1284 | } | |
1285 | rcu_read_unlock(); | |
1286 | } | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | ||
9cfc7bd6 | 1292 | /* @skb: the frame to be checked |
23721387 SW |
1293 | * @orig_node: the orig_node of the frame |
1294 | * @hdr_size: maximum length of the frame | |
1295 | * | |
1296 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1297 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1298 | * returns 0. | |
23721387 | 1299 | */ |
08adf151 SE |
1300 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1301 | struct orig_node *orig_node, int hdr_size) | |
23721387 SW |
1302 | { |
1303 | struct ethhdr *ethhdr; | |
1304 | struct vlan_ethhdr *vhdr; | |
1305 | struct backbone_gw *backbone_gw; | |
1306 | short vid = -1; | |
1307 | ||
1308 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1309 | return 0; | |
1310 | ||
1311 | /* first, find out the vid. */ | |
0d125074 | 1312 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1313 | return 0; |
1314 | ||
1315 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1316 | ||
1317 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1318 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1319 | return 0; | |
1320 | ||
1321 | vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) + | |
1322 | hdr_size); | |
1323 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1324 | } | |
1325 | ||
1326 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1327 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1328 | orig_node->orig, vid); | |
23721387 SW |
1329 | if (!backbone_gw) |
1330 | return 0; | |
1331 | ||
3b300de3 | 1332 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1333 | return 1; |
1334 | } | |
1335 | ||
1336 | /* free all bla structures (for softinterface free or module unload) */ | |
08adf151 | 1337 | void batadv_bla_free(struct bat_priv *bat_priv) |
23721387 SW |
1338 | { |
1339 | struct hard_iface *primary_if; | |
1340 | ||
1341 | cancel_delayed_work_sync(&bat_priv->bla_work); | |
e5d89254 | 1342 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1343 | |
1344 | if (bat_priv->claim_hash) { | |
3b300de3 | 1345 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
1a8eaf07 | 1346 | batadv_hash_destroy(bat_priv->claim_hash); |
23721387 SW |
1347 | bat_priv->claim_hash = NULL; |
1348 | } | |
1349 | if (bat_priv->backbone_hash) { | |
3b300de3 | 1350 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
1a8eaf07 | 1351 | batadv_hash_destroy(bat_priv->backbone_hash); |
23721387 SW |
1352 | bat_priv->backbone_hash = NULL; |
1353 | } | |
1354 | if (primary_if) | |
e5d89254 | 1355 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1356 | } |
1357 | ||
9cfc7bd6 | 1358 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1359 | * @skb: the frame to be checked |
1360 | * @vid: the VLAN ID of the frame | |
1361 | * | |
1362 | * bla_rx avoidance checks if: | |
1363 | * * we have to race for a claim | |
1364 | * * if the frame is allowed on the LAN | |
1365 | * | |
1366 | * in these cases, the skb is further handled by this function and | |
1367 | * returns 1, otherwise it returns 0 and the caller shall further | |
1368 | * process the skb. | |
23721387 | 1369 | */ |
08adf151 | 1370 | int batadv_bla_rx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1371 | { |
1372 | struct ethhdr *ethhdr; | |
1373 | struct claim search_claim, *claim = NULL; | |
1374 | struct hard_iface *primary_if; | |
1375 | int ret; | |
1376 | ||
1377 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1378 | ||
e5d89254 | 1379 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1380 | if (!primary_if) |
1381 | goto handled; | |
1382 | ||
1383 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1384 | goto allow; | |
1385 | ||
1386 | ||
1387 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1388 | /* don't allow broadcasts while requests are in flight */ | |
1389 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1390 | goto handled; | |
1391 | ||
1392 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1393 | search_claim.vid = vid; | |
3b300de3 | 1394 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1395 | |
1396 | if (!claim) { | |
1397 | /* possible optimization: race for a claim */ | |
1398 | /* No claim exists yet, claim it for us! | |
1399 | */ | |
3b300de3 SE |
1400 | batadv_handle_claim(bat_priv, primary_if, |
1401 | primary_if->net_dev->dev_addr, | |
1402 | ethhdr->h_source, vid); | |
23721387 SW |
1403 | goto allow; |
1404 | } | |
1405 | ||
1406 | /* if it is our own claim ... */ | |
1eda58bf SE |
1407 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1408 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1409 | /* ... allow it in any case */ |
1410 | claim->lasttime = jiffies; | |
1411 | goto allow; | |
1412 | } | |
1413 | ||
1414 | /* if it is a broadcast ... */ | |
1415 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1416 | /* ... drop it. the responsible gateway is in charge. */ | |
1417 | goto handled; | |
1418 | } else { | |
1419 | /* seems the client considers us as its best gateway. | |
1420 | * send a claim and update the claim table | |
1421 | * immediately. | |
1422 | */ | |
3b300de3 SE |
1423 | batadv_handle_claim(bat_priv, primary_if, |
1424 | primary_if->net_dev->dev_addr, | |
1425 | ethhdr->h_source, vid); | |
23721387 SW |
1426 | goto allow; |
1427 | } | |
1428 | allow: | |
3b300de3 | 1429 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1430 | ret = 0; |
1431 | goto out; | |
1432 | ||
1433 | handled: | |
1434 | kfree_skb(skb); | |
1435 | ret = 1; | |
1436 | ||
1437 | out: | |
1438 | if (primary_if) | |
e5d89254 | 1439 | batadv_hardif_free_ref(primary_if); |
23721387 | 1440 | if (claim) |
3b300de3 | 1441 | batadv_claim_free_ref(claim); |
23721387 SW |
1442 | return ret; |
1443 | } | |
1444 | ||
9cfc7bd6 | 1445 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1446 | * @skb: the frame to be checked |
1447 | * @vid: the VLAN ID of the frame | |
1448 | * | |
1449 | * bla_tx checks if: | |
1450 | * * a claim was received which has to be processed | |
1451 | * * the frame is allowed on the mesh | |
1452 | * | |
1453 | * in these cases, the skb is further handled by this function and | |
1454 | * returns 1, otherwise it returns 0 and the caller shall further | |
1455 | * process the skb. | |
23721387 | 1456 | */ |
08adf151 | 1457 | int batadv_bla_tx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1458 | { |
1459 | struct ethhdr *ethhdr; | |
1460 | struct claim search_claim, *claim = NULL; | |
1461 | struct hard_iface *primary_if; | |
1462 | int ret = 0; | |
1463 | ||
e5d89254 | 1464 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1465 | if (!primary_if) |
1466 | goto out; | |
1467 | ||
1468 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1469 | goto allow; | |
1470 | ||
1471 | /* in VLAN case, the mac header might not be set. */ | |
1472 | skb_reset_mac_header(skb); | |
1473 | ||
3b300de3 | 1474 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1475 | goto handled; |
1476 | ||
1477 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1478 | ||
1479 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1480 | /* don't allow broadcasts while requests are in flight */ | |
1481 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1482 | goto handled; | |
1483 | ||
1484 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1485 | search_claim.vid = vid; | |
1486 | ||
3b300de3 | 1487 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1488 | |
1489 | /* if no claim exists, allow it. */ | |
1490 | if (!claim) | |
1491 | goto allow; | |
1492 | ||
1493 | /* check if we are responsible. */ | |
1eda58bf SE |
1494 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1495 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1496 | /* if yes, the client has roamed and we have |
1497 | * to unclaim it. | |
1498 | */ | |
3b300de3 SE |
1499 | batadv_handle_unclaim(bat_priv, primary_if, |
1500 | primary_if->net_dev->dev_addr, | |
1501 | ethhdr->h_source, vid); | |
23721387 SW |
1502 | goto allow; |
1503 | } | |
1504 | ||
1505 | /* check if it is a multicast/broadcast frame */ | |
1506 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1507 | /* drop it. the responsible gateway has forwarded it into | |
1508 | * the backbone network. | |
1509 | */ | |
1510 | goto handled; | |
1511 | } else { | |
1512 | /* we must allow it. at least if we are | |
1513 | * responsible for the DESTINATION. | |
1514 | */ | |
1515 | goto allow; | |
1516 | } | |
1517 | allow: | |
3b300de3 | 1518 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1519 | ret = 0; |
1520 | goto out; | |
1521 | handled: | |
1522 | ret = 1; | |
1523 | out: | |
1524 | if (primary_if) | |
e5d89254 | 1525 | batadv_hardif_free_ref(primary_if); |
23721387 | 1526 | if (claim) |
3b300de3 | 1527 | batadv_claim_free_ref(claim); |
23721387 SW |
1528 | return ret; |
1529 | } | |
9bf8e4d4 | 1530 | |
08adf151 | 1531 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1532 | { |
1533 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1534 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
1535 | struct hashtable_t *hash = bat_priv->claim_hash; | |
1536 | struct claim *claim; | |
1537 | struct hard_iface *primary_if; | |
1538 | struct hlist_node *node; | |
1539 | struct hlist_head *head; | |
1540 | uint32_t i; | |
1541 | bool is_own; | |
1542 | int ret = 0; | |
1eda58bf | 1543 | uint8_t *primary_addr; |
9bf8e4d4 | 1544 | |
e5d89254 | 1545 | primary_if = batadv_primary_if_get_selected(bat_priv); |
9bf8e4d4 SW |
1546 | if (!primary_if) { |
1547 | ret = seq_printf(seq, | |
1548 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1549 | net_dev->name); | |
1550 | goto out; | |
1551 | } | |
1552 | ||
1553 | if (primary_if->if_status != IF_ACTIVE) { | |
1554 | ret = seq_printf(seq, | |
1555 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1556 | net_dev->name); | |
1557 | goto out; | |
1558 | } | |
1559 | ||
1eda58bf | 1560 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d SW |
1561 | seq_printf(seq, |
1562 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1eda58bf | 1563 | net_dev->name, primary_addr, |
38ef3d1d | 1564 | ntohs(bat_priv->claim_dest.group)); |
9bf8e4d4 SW |
1565 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1566 | "Client", "VID", "Originator", "CRC"); | |
1567 | for (i = 0; i < hash->size; i++) { | |
1568 | head = &hash->table[i]; | |
1569 | ||
1570 | rcu_read_lock(); | |
1571 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1eda58bf SE |
1572 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1573 | primary_addr); | |
9bf8e4d4 SW |
1574 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", |
1575 | claim->addr, claim->vid, | |
1576 | claim->backbone_gw->orig, | |
1577 | (is_own ? 'x' : ' '), | |
1578 | claim->backbone_gw->crc); | |
1579 | } | |
1580 | rcu_read_unlock(); | |
1581 | } | |
1582 | out: | |
1583 | if (primary_if) | |
e5d89254 | 1584 | batadv_hardif_free_ref(primary_if); |
9bf8e4d4 SW |
1585 | return ret; |
1586 | } |