Commit | Line | Data |
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e19f9759 | 1 | /* Copyright (C) 2011-2014 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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23721387 SW |
16 | */ |
17 | ||
18 | #include "main.h" | |
19 | #include "hash.h" | |
20 | #include "hard-interface.h" | |
21 | #include "originator.h" | |
22 | #include "bridge_loop_avoidance.h" | |
20ff9d59 | 23 | #include "translation-table.h" |
23721387 SW |
24 | #include "send.h" |
25 | ||
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/crc16.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <net/arp.h> | |
30 | #include <linux/if_vlan.h> | |
31 | ||
3b300de3 | 32 | static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 33 | |
3b300de3 | 34 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
35 | static void |
36 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
37 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 SW |
38 | |
39 | /* return the index of the claim */ | |
3b300de3 | 40 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
23721387 | 41 | { |
712bbfe4 | 42 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 43 | uint32_t hash = 0; |
23721387 | 44 | |
07568d03 SW |
45 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
46 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
47 | |
48 | hash += (hash << 3); | |
49 | hash ^= (hash >> 11); | |
50 | hash += (hash << 15); | |
51 | ||
52 | return hash % size; | |
53 | } | |
54 | ||
55 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
56 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
57 | uint32_t size) | |
23721387 | 58 | { |
712bbfe4 | 59 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 60 | uint32_t hash = 0; |
23721387 | 61 | |
07568d03 SW |
62 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
63 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
64 | |
65 | hash += (hash << 3); | |
66 | hash ^= (hash >> 11); | |
67 | hash += (hash << 15); | |
68 | ||
69 | return hash % size; | |
70 | } | |
71 | ||
23721387 | 72 | /* compares address and vid of two backbone gws */ |
3b300de3 SE |
73 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
74 | const void *data2) | |
23721387 | 75 | { |
bae98774 | 76 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 77 | hash_entry); |
bae98774 | 78 | const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2; |
23721387 | 79 | |
c76d1525 SW |
80 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
81 | return 0; | |
82 | ||
83 | if (gw1->vid != gw2->vid) | |
84 | return 0; | |
85 | ||
86 | return 1; | |
23721387 SW |
87 | } |
88 | ||
89 | /* compares address and vid of two claims */ | |
3b300de3 SE |
90 | static int batadv_compare_claim(const struct hlist_node *node, |
91 | const void *data2) | |
23721387 | 92 | { |
712bbfe4 | 93 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 94 | hash_entry); |
712bbfe4 | 95 | const struct batadv_bla_claim *cl1 = data1, *cl2 = data2; |
c76d1525 SW |
96 | |
97 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
98 | return 0; | |
99 | ||
100 | if (cl1->vid != cl2->vid) | |
101 | return 0; | |
23721387 | 102 | |
c76d1525 | 103 | return 1; |
23721387 SW |
104 | } |
105 | ||
106 | /* free a backbone gw */ | |
bae98774 ML |
107 | static void |
108 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) | |
23721387 SW |
109 | { |
110 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
111 | kfree_rcu(backbone_gw, rcu); | |
112 | } | |
113 | ||
114 | /* finally deinitialize the claim */ | |
3b300de3 | 115 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 116 | { |
712bbfe4 | 117 | struct batadv_bla_claim *claim; |
23721387 | 118 | |
712bbfe4 | 119 | claim = container_of(rcu, struct batadv_bla_claim, rcu); |
23721387 | 120 | |
3b300de3 | 121 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
122 | kfree(claim); |
123 | } | |
124 | ||
125 | /* free a claim, call claim_free_rcu if its the last reference */ | |
712bbfe4 | 126 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 SW |
127 | { |
128 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 129 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
130 | } |
131 | ||
1b371d13 SW |
132 | /** |
133 | * batadv_claim_hash_find | |
134 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
135 | * @data: search data (may be local/static data) |
136 | * | |
137 | * looks for a claim in the hash, and returns it if found | |
138 | * or NULL otherwise. | |
139 | */ | |
712bbfe4 ML |
140 | static struct batadv_bla_claim |
141 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
142 | struct batadv_bla_claim *data) | |
23721387 | 143 | { |
807736f6 | 144 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 145 | struct hlist_head *head; |
712bbfe4 ML |
146 | struct batadv_bla_claim *claim; |
147 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
148 | int index; |
149 | ||
150 | if (!hash) | |
151 | return NULL; | |
152 | ||
3b300de3 | 153 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
154 | head = &hash->table[index]; |
155 | ||
156 | rcu_read_lock(); | |
b67bfe0d | 157 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 158 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
159 | continue; |
160 | ||
161 | if (!atomic_inc_not_zero(&claim->refcount)) | |
162 | continue; | |
163 | ||
164 | claim_tmp = claim; | |
165 | break; | |
166 | } | |
167 | rcu_read_unlock(); | |
168 | ||
169 | return claim_tmp; | |
170 | } | |
171 | ||
2c53040f BH |
172 | /** |
173 | * batadv_backbone_hash_find - looks for a claim in the hash | |
174 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
175 | * @addr: the address of the originator |
176 | * @vid: the VLAN ID | |
177 | * | |
2c53040f | 178 | * Returns claim if found or NULL otherwise. |
23721387 | 179 | */ |
bae98774 | 180 | static struct batadv_bla_backbone_gw * |
56303d34 | 181 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, |
eb2deb6b | 182 | uint8_t *addr, unsigned short vid) |
23721387 | 183 | { |
807736f6 | 184 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 185 | struct hlist_head *head; |
bae98774 ML |
186 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
187 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
188 | int index; |
189 | ||
190 | if (!hash) | |
191 | return NULL; | |
192 | ||
8fdd0153 | 193 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
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(); | |
b67bfe0d | 200 | hlist_for_each_entry_rcu(backbone_gw, 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 | 217 | static void |
bae98774 | 218 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 219 | { |
5bf74e9c | 220 | struct batadv_hashtable *hash; |
b67bfe0d | 221 | struct hlist_node *node_tmp; |
23721387 | 222 | struct hlist_head *head; |
712bbfe4 | 223 | struct batadv_bla_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); | |
b67bfe0d | 236 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 237 | head, hash_entry) { |
23721387 SW |
238 | if (claim->backbone_gw != backbone_gw) |
239 | continue; | |
240 | ||
3b300de3 | 241 | batadv_claim_free_ref(claim); |
b67bfe0d | 242 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
243 | } |
244 | spin_unlock_bh(list_lock); | |
245 | } | |
246 | ||
3f68785e | 247 | /* all claims gone, initialize CRC */ |
3964f728 | 248 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
249 | } |
250 | ||
2c53040f BH |
251 | /** |
252 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
253 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 254 | * @mac: the mac address to be announced within the claim |
23721387 SW |
255 | * @vid: the VLAN ID |
256 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 257 | */ |
56303d34 | 258 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
eb2deb6b | 259 | unsigned short vid, int claimtype) |
23721387 SW |
260 | { |
261 | struct sk_buff *skb; | |
262 | struct ethhdr *ethhdr; | |
56303d34 | 263 | struct batadv_hard_iface *primary_if; |
23721387 SW |
264 | struct net_device *soft_iface; |
265 | uint8_t *hw_src; | |
96412690 | 266 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 267 | __be32 zeroip = 0; |
23721387 | 268 | |
e5d89254 | 269 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
270 | if (!primary_if) |
271 | return; | |
272 | ||
807736f6 | 273 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 274 | sizeof(local_claim_dest)); |
23721387 SW |
275 | local_claim_dest.type = claimtype; |
276 | ||
277 | soft_iface = primary_if->soft_iface; | |
278 | ||
279 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
280 | /* IP DST: 0.0.0.0 */ | |
281 | zeroip, | |
282 | primary_if->soft_iface, | |
283 | /* IP SRC: 0.0.0.0 */ | |
284 | zeroip, | |
285 | /* Ethernet DST: Broadcast */ | |
286 | NULL, | |
287 | /* Ethernet SRC/HW SRC: originator mac */ | |
288 | primary_if->net_dev->dev_addr, | |
99e966fc | 289 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 290 | * with XX = claim type |
38ef3d1d | 291 | * and YY:YY = group id |
23721387 SW |
292 | */ |
293 | (uint8_t *)&local_claim_dest); | |
294 | ||
295 | if (!skb) | |
296 | goto out; | |
297 | ||
298 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 299 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
300 | |
301 | /* now we pretend that the client would have sent this ... */ | |
302 | switch (claimtype) { | |
3eb8773e | 303 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
304 | /* normal claim frame |
305 | * set Ethernet SRC to the clients mac | |
306 | */ | |
8fdd0153 | 307 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 308 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
309 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
310 | BATADV_PRINT_VID(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 | */ | |
8fdd0153 | 316 | ether_addr_copy(hw_src, mac); |
39c75a51 | 317 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 318 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 319 | BATADV_PRINT_VID(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 | */ | |
8fdd0153 | 325 | ether_addr_copy(hw_src, mac); |
39c75a51 | 326 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 327 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 328 | ethhdr->h_source, BATADV_PRINT_VID(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 | 334 | */ |
8fdd0153 AQ |
335 | ether_addr_copy(hw_src, mac); |
336 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 337 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 338 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
339 | ethhdr->h_source, ethhdr->h_dest, |
340 | BATADV_PRINT_VID(vid)); | |
23721387 | 341 | break; |
23721387 SW |
342 | } |
343 | ||
eb2deb6b AQ |
344 | if (vid & BATADV_VLAN_HAS_TAG) |
345 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
346 | vid & VLAN_VID_MASK); | |
23721387 SW |
347 | |
348 | skb_reset_mac_header(skb); | |
349 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
350 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
351 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
352 | skb->len + ETH_HLEN); | |
23721387 SW |
353 | soft_iface->last_rx = jiffies; |
354 | ||
355 | netif_rx(skb); | |
356 | out: | |
357 | if (primary_if) | |
e5d89254 | 358 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
359 | } |
360 | ||
2c53040f BH |
361 | /** |
362 | * batadv_bla_get_backbone_gw | |
363 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
364 | * @orig: the mac address of the originator |
365 | * @vid: the VLAN ID | |
e3357189 | 366 | * @own_backbone: set if the requested backbone is local |
23721387 SW |
367 | * |
368 | * searches for the backbone gw or creates a new one if it could not | |
369 | * be found. | |
370 | */ | |
bae98774 | 371 | static struct batadv_bla_backbone_gw * |
56303d34 | 372 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, |
eb2deb6b | 373 | unsigned short vid, bool own_backbone) |
23721387 | 374 | { |
bae98774 | 375 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 376 | struct batadv_orig_node *orig_node; |
23721387 SW |
377 | int hash_added; |
378 | ||
3b300de3 | 379 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
380 | |
381 | if (entry) | |
382 | return entry; | |
383 | ||
39c75a51 | 384 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 385 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 386 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
387 | |
388 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
389 | if (!entry) | |
390 | return NULL; | |
391 | ||
392 | entry->vid = vid; | |
393 | entry->lasttime = jiffies; | |
3964f728 | 394 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
395 | entry->bat_priv = bat_priv; |
396 | atomic_set(&entry->request_sent, 0); | |
28709878 | 397 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 398 | ether_addr_copy(entry->orig, orig); |
23721387 SW |
399 | |
400 | /* one for the hash, one for returning */ | |
401 | atomic_set(&entry->refcount, 2); | |
402 | ||
807736f6 | 403 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
404 | batadv_compare_backbone_gw, |
405 | batadv_choose_backbone_gw, entry, | |
406 | &entry->hash_entry); | |
23721387 SW |
407 | |
408 | if (unlikely(hash_added != 0)) { | |
409 | /* hash failed, free the structure */ | |
410 | kfree(entry); | |
411 | return NULL; | |
412 | } | |
413 | ||
95fb130d | 414 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 415 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 416 | if (orig_node) { |
95fb130d | 417 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 418 | "became a backbone gateway"); |
7d211efc | 419 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 420 | } |
52aebd6a | 421 | |
d807f272 | 422 | if (own_backbone) { |
52aebd6a SW |
423 | batadv_bla_send_announce(bat_priv, entry); |
424 | ||
d807f272 SW |
425 | /* this will be decreased in the worker thread */ |
426 | atomic_inc(&entry->request_sent); | |
28709878 | 427 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
428 | atomic_inc(&bat_priv->bla.num_requests); |
429 | } | |
430 | ||
23721387 SW |
431 | return entry; |
432 | } | |
433 | ||
434 | /* update or add the own backbone gw to make sure we announce | |
435 | * where we receive other backbone gws | |
436 | */ | |
56303d34 SE |
437 | static void |
438 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
439 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 440 | unsigned short vid) |
23721387 | 441 | { |
bae98774 | 442 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 443 | |
3b300de3 SE |
444 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
445 | primary_if->net_dev->dev_addr, | |
52aebd6a | 446 | vid, true); |
23721387 SW |
447 | if (unlikely(!backbone_gw)) |
448 | return; | |
449 | ||
450 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 451 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
452 | } |
453 | ||
1b371d13 SW |
454 | /** |
455 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
456 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 457 | * @primary_if: interface where the request came on |
23721387 SW |
458 | * @vid: the vid where the request came on |
459 | * | |
460 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
461 | * to allow the requester another check if the CRC is correct now. | |
462 | */ | |
56303d34 SE |
463 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
464 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 465 | unsigned short vid) |
23721387 | 466 | { |
23721387 | 467 | struct hlist_head *head; |
5bf74e9c | 468 | struct batadv_hashtable *hash; |
712bbfe4 | 469 | struct batadv_bla_claim *claim; |
bae98774 | 470 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
471 | int i; |
472 | ||
39c75a51 | 473 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 474 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 475 | |
3b300de3 SE |
476 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
477 | primary_if->net_dev->dev_addr, | |
478 | vid); | |
23721387 SW |
479 | if (!backbone_gw) |
480 | return; | |
481 | ||
807736f6 | 482 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
483 | for (i = 0; i < hash->size; i++) { |
484 | head = &hash->table[i]; | |
485 | ||
486 | rcu_read_lock(); | |
b67bfe0d | 487 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
488 | /* only own claims are interesting */ |
489 | if (claim->backbone_gw != backbone_gw) | |
490 | continue; | |
491 | ||
3b300de3 | 492 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 493 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
494 | } |
495 | rcu_read_unlock(); | |
496 | } | |
497 | ||
498 | /* finally, send an announcement frame */ | |
3b300de3 SE |
499 | batadv_bla_send_announce(bat_priv, backbone_gw); |
500 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
501 | } |
502 | ||
1b371d13 SW |
503 | /** |
504 | * batadv_bla_send_request - send a request to repeat claims | |
505 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
506 | * |
507 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
508 | * After the request, it will repeat all of his own claims and finally | |
509 | * send an announcement claim with which we can check again. | |
510 | */ | |
bae98774 | 511 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
512 | { |
513 | /* first, remove all old entries */ | |
3b300de3 | 514 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 515 | |
39c75a51 SE |
516 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
517 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
518 | |
519 | /* send request */ | |
3b300de3 | 520 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 521 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
522 | |
523 | /* no local broadcasts should be sent or received, for now. */ | |
524 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 525 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
526 | atomic_set(&backbone_gw->request_sent, 1); |
527 | } | |
528 | } | |
529 | ||
1b371d13 SW |
530 | /** |
531 | * batadv_bla_send_announce | |
532 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
533 | * @backbone_gw: our backbone gateway which should be announced |
534 | * | |
535 | * This function sends an announcement. It is called from multiple | |
536 | * places. | |
537 | */ | |
56303d34 | 538 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 539 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
540 | { |
541 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 542 | __be16 crc; |
23721387 | 543 | |
3b300de3 | 544 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 545 | crc = htons(backbone_gw->crc); |
1a5852d8 | 546 | memcpy(&mac[4], &crc, 2); |
23721387 | 547 | |
3b300de3 | 548 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 549 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
550 | } |
551 | ||
2c53040f BH |
552 | /** |
553 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
554 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
555 | * @mac: the mac address of the claim |
556 | * @vid: the VLAN ID of the frame | |
557 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 558 | */ |
56303d34 | 559 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
eb2deb6b | 560 | const uint8_t *mac, const unsigned short vid, |
bae98774 | 561 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 562 | { |
712bbfe4 ML |
563 | struct batadv_bla_claim *claim; |
564 | struct batadv_bla_claim search_claim; | |
23721387 SW |
565 | int hash_added; |
566 | ||
8fdd0153 | 567 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 568 | search_claim.vid = vid; |
3b300de3 | 569 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
570 | |
571 | /* create a new claim entry if it does not exist yet. */ | |
572 | if (!claim) { | |
573 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
574 | if (!claim) | |
575 | return; | |
576 | ||
8fdd0153 | 577 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
578 | claim->vid = vid; |
579 | claim->lasttime = jiffies; | |
580 | claim->backbone_gw = backbone_gw; | |
581 | ||
582 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 583 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 584 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 585 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 586 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
587 | batadv_compare_claim, |
588 | batadv_choose_claim, claim, | |
589 | &claim->hash_entry); | |
23721387 SW |
590 | |
591 | if (unlikely(hash_added != 0)) { | |
592 | /* only local changes happened. */ | |
593 | kfree(claim); | |
594 | return; | |
595 | } | |
596 | } else { | |
597 | claim->lasttime = jiffies; | |
598 | if (claim->backbone_gw == backbone_gw) | |
599 | /* no need to register a new backbone */ | |
600 | goto claim_free_ref; | |
601 | ||
39c75a51 | 602 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 603 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 604 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 605 | |
bbb1f90e | 606 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 607 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
608 | } |
609 | /* set (new) backbone gw */ | |
610 | atomic_inc(&backbone_gw->refcount); | |
611 | claim->backbone_gw = backbone_gw; | |
612 | ||
613 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
614 | backbone_gw->lasttime = jiffies; | |
615 | ||
616 | claim_free_ref: | |
3b300de3 | 617 | batadv_claim_free_ref(claim); |
23721387 SW |
618 | } |
619 | ||
620 | /* Delete a claim from the claim hash which has the | |
621 | * given mac address and vid. | |
622 | */ | |
56303d34 | 623 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
eb2deb6b | 624 | const uint8_t *mac, const unsigned short vid) |
23721387 | 625 | { |
712bbfe4 | 626 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 627 | |
8fdd0153 | 628 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 629 | search_claim.vid = vid; |
3b300de3 | 630 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
631 | if (!claim) |
632 | return; | |
633 | ||
39c75a51 | 634 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 635 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 636 | |
807736f6 | 637 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
638 | batadv_choose_claim, claim); |
639 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
640 | |
641 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
642 | ||
643 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 644 | batadv_claim_free_ref(claim); |
23721387 SW |
645 | } |
646 | ||
647 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 648 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 | 649 | uint8_t *an_addr, uint8_t *backbone_addr, |
eb2deb6b | 650 | unsigned short vid) |
23721387 | 651 | { |
bae98774 | 652 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
653 | uint16_t crc; |
654 | ||
3b300de3 | 655 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
656 | return 0; |
657 | ||
52aebd6a SW |
658 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
659 | false); | |
23721387 SW |
660 | |
661 | if (unlikely(!backbone_gw)) | |
662 | return 1; | |
663 | ||
23721387 SW |
664 | /* handle as ANNOUNCE frame */ |
665 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 666 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 667 | |
39c75a51 | 668 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 669 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 670 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 SW |
671 | |
672 | if (backbone_gw->crc != crc) { | |
39c75a51 | 673 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 674 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
675 | backbone_gw->orig, |
676 | BATADV_PRINT_VID(backbone_gw->vid), | |
1eda58bf | 677 | backbone_gw->crc, crc); |
23721387 | 678 | |
3b300de3 | 679 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
680 | } else { |
681 | /* if we have sent a request and the crc was OK, | |
682 | * we can allow traffic again. | |
683 | */ | |
684 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 685 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
686 | atomic_set(&backbone_gw->request_sent, 0); |
687 | } | |
688 | } | |
689 | ||
3b300de3 | 690 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
691 | return 1; |
692 | } | |
693 | ||
694 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
695 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
696 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 697 | uint8_t *backbone_addr, |
eb2deb6b | 698 | struct ethhdr *ethhdr, unsigned short vid) |
23721387 SW |
699 | { |
700 | /* check for REQUEST frame */ | |
1eda58bf | 701 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
702 | return 0; |
703 | ||
704 | /* sanity check, this should not happen on a normal switch, | |
705 | * we ignore it in this case. | |
706 | */ | |
1eda58bf | 707 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
708 | return 1; |
709 | ||
39c75a51 | 710 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 711 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 712 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 713 | |
3b300de3 | 714 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
715 | return 1; |
716 | } | |
717 | ||
718 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
719 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
720 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 721 | uint8_t *backbone_addr, |
eb2deb6b | 722 | uint8_t *claim_addr, unsigned short vid) |
23721387 | 723 | { |
bae98774 | 724 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
725 | |
726 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
727 | if (primary_if && batadv_compare_eth(backbone_addr, |
728 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 729 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 730 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 731 | |
3b300de3 | 732 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
733 | |
734 | if (!backbone_gw) | |
735 | return 1; | |
736 | ||
737 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 738 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 739 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 740 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 741 | |
3b300de3 SE |
742 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
743 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
744 | return 1; |
745 | } | |
746 | ||
747 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
748 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
749 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 750 | uint8_t *backbone_addr, uint8_t *claim_addr, |
eb2deb6b | 751 | unsigned short vid) |
23721387 | 752 | { |
bae98774 | 753 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
754 | |
755 | /* register the gateway if not yet available, and add the claim. */ | |
756 | ||
52aebd6a SW |
757 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
758 | false); | |
23721387 SW |
759 | |
760 | if (unlikely(!backbone_gw)) | |
761 | return 1; | |
762 | ||
763 | /* this must be a CLAIM frame */ | |
3b300de3 | 764 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 765 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 766 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 767 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
768 | |
769 | /* TODO: we could call something like tt_local_del() here. */ | |
770 | ||
3b300de3 | 771 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
772 | return 1; |
773 | } | |
774 | ||
2c53040f BH |
775 | /** |
776 | * batadv_check_claim_group | |
777 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 778 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
779 | * @hw_src: the Hardware source in the ARP Header |
780 | * @hw_dst: the Hardware destination in the ARP Header | |
781 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
782 | * | |
783 | * checks if it is a claim packet and if its on the same group. | |
784 | * This function also applies the group ID of the sender | |
785 | * if it is in the same mesh. | |
786 | * | |
787 | * returns: | |
788 | * 2 - if it is a claim packet and on the same group | |
789 | * 1 - if is a claim packet from another group | |
790 | * 0 - if it is not a claim packet | |
791 | */ | |
56303d34 SE |
792 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
793 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
794 | uint8_t *hw_src, uint8_t *hw_dst, |
795 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
796 | { |
797 | uint8_t *backbone_addr; | |
56303d34 | 798 | struct batadv_orig_node *orig_node; |
96412690 | 799 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 800 | |
96412690 | 801 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 802 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 803 | |
38ef3d1d SW |
804 | /* if announcement packet, use the source, |
805 | * otherwise assume it is in the hw_src | |
806 | */ | |
807 | switch (bla_dst->type) { | |
3eb8773e | 808 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
809 | backbone_addr = hw_src; |
810 | break; | |
acd34afa SE |
811 | case BATADV_CLAIM_TYPE_REQUEST: |
812 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 813 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
814 | backbone_addr = ethhdr->h_source; |
815 | break; | |
816 | default: | |
817 | return 0; | |
818 | } | |
819 | ||
820 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 821 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
822 | return 0; |
823 | ||
824 | /* if its already the same group, it is fine. */ | |
825 | if (bla_dst->group == bla_dst_own->group) | |
826 | return 2; | |
827 | ||
828 | /* lets see if this originator is in our mesh */ | |
da641193 | 829 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
830 | |
831 | /* dont accept claims from gateways which are not in | |
832 | * the same mesh or group. | |
833 | */ | |
834 | if (!orig_node) | |
835 | return 1; | |
836 | ||
837 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
838 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 839 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 840 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 841 | ntohs(bla_dst->group)); |
38ef3d1d SW |
842 | bla_dst_own->group = bla_dst->group; |
843 | } | |
844 | ||
7d211efc | 845 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
846 | |
847 | return 2; | |
848 | } | |
849 | ||
1b371d13 SW |
850 | /** |
851 | * batadv_bla_process_claim | |
852 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 853 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
854 | * @skb: the frame to be checked |
855 | * | |
856 | * Check if this is a claim frame, and process it accordingly. | |
857 | * | |
858 | * returns 1 if it was a claim frame, otherwise return 0 to | |
859 | * tell the callee that it can use the frame on its own. | |
860 | */ | |
56303d34 SE |
861 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
862 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 863 | struct sk_buff *skb) |
23721387 | 864 | { |
d46b6bfa | 865 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
c018ad3d | 866 | uint8_t *hw_src, *hw_dst; |
d46b6bfa | 867 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 868 | struct ethhdr *ethhdr; |
23721387 | 869 | struct arphdr *arphdr; |
c018ad3d | 870 | unsigned short vid; |
d46b6bfa | 871 | int vlan_depth = 0; |
293e9338 | 872 | __be16 proto; |
23721387 | 873 | int headlen; |
38ef3d1d | 874 | int ret; |
23721387 | 875 | |
c018ad3d | 876 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 877 | ethhdr = eth_hdr(skb); |
23721387 | 878 | |
c018ad3d AQ |
879 | proto = ethhdr->h_proto; |
880 | headlen = ETH_HLEN; | |
881 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
882 | /* Traverse the VLAN/Ethertypes. |
883 | * | |
884 | * At this point it is known that the first protocol is a VLAN | |
885 | * header, so start checking at the encapsulated protocol. | |
886 | * | |
887 | * The depth of the VLAN headers is recorded to drop BLA claim | |
888 | * frames encapsulated into multiple VLAN headers (QinQ). | |
889 | */ | |
890 | do { | |
891 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
892 | &vhdr_buf); | |
893 | if (!vhdr) | |
894 | return 0; | |
895 | ||
896 | proto = vhdr->h_vlan_encapsulated_proto; | |
897 | headlen += VLAN_HLEN; | |
898 | vlan_depth++; | |
899 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
900 | } |
901 | ||
293e9338 | 902 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
903 | return 0; /* not a claim frame */ |
904 | ||
905 | /* this must be a ARP frame. check if it is a claim. */ | |
906 | ||
907 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
908 | return 0; | |
909 | ||
910 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 911 | ethhdr = eth_hdr(skb); |
23721387 SW |
912 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); |
913 | ||
914 | /* Check whether the ARP frame carries a valid | |
915 | * IP information | |
916 | */ | |
23721387 SW |
917 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
918 | return 0; | |
919 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
920 | return 0; | |
921 | if (arphdr->ar_hln != ETH_ALEN) | |
922 | return 0; | |
923 | if (arphdr->ar_pln != 4) | |
924 | return 0; | |
925 | ||
926 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
927 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 928 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
929 | bla_dst_own = &bat_priv->bla.claim_dest; |
930 | ||
931 | /* check if it is a claim frame in general */ | |
932 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
933 | sizeof(bla_dst->magic)) != 0) | |
934 | return 0; | |
935 | ||
936 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
937 | * drop that, as this is not supported by BLA but should also not be | |
938 | * sent via the mesh. | |
939 | */ | |
940 | if (vlan_depth > 1) | |
941 | return 1; | |
23721387 SW |
942 | |
943 | /* check if it is a claim frame. */ | |
3b300de3 SE |
944 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
945 | ethhdr); | |
38ef3d1d | 946 | if (ret == 1) |
39c75a51 | 947 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 948 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
949 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
950 | hw_dst); | |
38ef3d1d SW |
951 | |
952 | if (ret < 2) | |
953 | return ret; | |
23721387 SW |
954 | |
955 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 956 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
957 | |
958 | /* check for the different types of claim frames ... */ | |
959 | switch (bla_dst->type) { | |
3eb8773e | 960 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
961 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
962 | ethhdr->h_source, vid)) | |
23721387 SW |
963 | return 1; |
964 | break; | |
3eb8773e | 965 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
966 | if (batadv_handle_unclaim(bat_priv, primary_if, |
967 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
968 | return 1; |
969 | break; | |
970 | ||
acd34afa | 971 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
972 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
973 | vid)) | |
23721387 SW |
974 | return 1; |
975 | break; | |
acd34afa | 976 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
977 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
978 | vid)) | |
23721387 SW |
979 | return 1; |
980 | break; | |
981 | } | |
982 | ||
39c75a51 | 983 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 984 | "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", |
5f80df67 | 985 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
986 | return 1; |
987 | } | |
988 | ||
989 | /* Check when we last heard from other nodes, and remove them in case of | |
990 | * a time out, or clean all backbone gws if now is set. | |
991 | */ | |
56303d34 | 992 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 993 | { |
bae98774 | 994 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 995 | struct hlist_node *node_tmp; |
23721387 | 996 | struct hlist_head *head; |
5bf74e9c | 997 | struct batadv_hashtable *hash; |
23721387 SW |
998 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
999 | int i; | |
1000 | ||
807736f6 | 1001 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1002 | if (!hash) |
1003 | return; | |
1004 | ||
1005 | for (i = 0; i < hash->size; i++) { | |
1006 | head = &hash->table[i]; | |
1007 | list_lock = &hash->list_locks[i]; | |
1008 | ||
1009 | spin_lock_bh(list_lock); | |
b67bfe0d | 1010 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1011 | head, hash_entry) { |
1012 | if (now) | |
1013 | goto purge_now; | |
1eda58bf | 1014 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1015 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1016 | continue; |
1017 | ||
39c75a51 | 1018 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1019 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1020 | backbone_gw->orig); | |
23721387 SW |
1021 | |
1022 | purge_now: | |
1023 | /* don't wait for the pending request anymore */ | |
1024 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1025 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1026 | |
3b300de3 | 1027 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1028 | |
b67bfe0d | 1029 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1030 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1031 | } |
1032 | spin_unlock_bh(list_lock); | |
1033 | } | |
1034 | } | |
1035 | ||
2c53040f BH |
1036 | /** |
1037 | * batadv_bla_purge_claims | |
1038 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1039 | * @primary_if: the selected primary interface, may be NULL if now is set |
1040 | * @now: whether the whole hash shall be wiped now | |
1041 | * | |
1042 | * Check when we heard last time from our own claims, and remove them in case of | |
1043 | * a time out, or clean all claims if now is set | |
1044 | */ | |
56303d34 SE |
1045 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1046 | struct batadv_hard_iface *primary_if, | |
1047 | int now) | |
23721387 | 1048 | { |
712bbfe4 | 1049 | struct batadv_bla_claim *claim; |
23721387 | 1050 | struct hlist_head *head; |
5bf74e9c | 1051 | struct batadv_hashtable *hash; |
23721387 SW |
1052 | int i; |
1053 | ||
807736f6 | 1054 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1055 | if (!hash) |
1056 | return; | |
1057 | ||
1058 | for (i = 0; i < hash->size; i++) { | |
1059 | head = &hash->table[i]; | |
1060 | ||
1061 | rcu_read_lock(); | |
b67bfe0d | 1062 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1063 | if (now) |
1064 | goto purge_now; | |
1eda58bf SE |
1065 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1066 | primary_if->net_dev->dev_addr)) | |
23721387 | 1067 | continue; |
1eda58bf | 1068 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1069 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1070 | continue; |
1071 | ||
39c75a51 | 1072 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1073 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1074 | claim->addr, claim->vid); | |
23721387 SW |
1075 | |
1076 | purge_now: | |
3b300de3 SE |
1077 | batadv_handle_unclaim(bat_priv, primary_if, |
1078 | claim->backbone_gw->orig, | |
1079 | claim->addr, claim->vid); | |
23721387 SW |
1080 | } |
1081 | rcu_read_unlock(); | |
1082 | } | |
1083 | } | |
1084 | ||
2c53040f BH |
1085 | /** |
1086 | * batadv_bla_update_orig_address | |
1087 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1088 | * @primary_if: the new selected primary_if |
1089 | * @oldif: the old primary interface, may be NULL | |
1090 | * | |
1091 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1092 | */ |
56303d34 SE |
1093 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1094 | struct batadv_hard_iface *primary_if, | |
1095 | struct batadv_hard_iface *oldif) | |
23721387 | 1096 | { |
bae98774 | 1097 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1098 | struct hlist_head *head; |
5bf74e9c | 1099 | struct batadv_hashtable *hash; |
807736f6 | 1100 | __be16 group; |
23721387 SW |
1101 | int i; |
1102 | ||
38ef3d1d | 1103 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1104 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1105 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1106 | |
d5b4c93e SW |
1107 | /* purge everything when bridge loop avoidance is turned off */ |
1108 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1109 | oldif = NULL; | |
1110 | ||
23721387 | 1111 | if (!oldif) { |
3b300de3 SE |
1112 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1113 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1114 | return; |
1115 | } | |
1116 | ||
807736f6 | 1117 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1118 | if (!hash) |
1119 | return; | |
1120 | ||
1121 | for (i = 0; i < hash->size; i++) { | |
1122 | head = &hash->table[i]; | |
1123 | ||
1124 | rcu_read_lock(); | |
b67bfe0d | 1125 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1126 | /* own orig still holds the old value. */ |
1eda58bf SE |
1127 | if (!batadv_compare_eth(backbone_gw->orig, |
1128 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1129 | continue; |
1130 | ||
8fdd0153 AQ |
1131 | ether_addr_copy(backbone_gw->orig, |
1132 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1133 | /* send an announce frame so others will ask for our |
1134 | * claims and update their tables. | |
1135 | */ | |
3b300de3 | 1136 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1137 | } |
1138 | rcu_read_unlock(); | |
1139 | } | |
1140 | } | |
1141 | ||
23721387 SW |
1142 | /* periodic work to do: |
1143 | * * purge structures when they are too old | |
1144 | * * send announcements | |
1145 | */ | |
3b300de3 | 1146 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1147 | { |
bbb1f90e | 1148 | struct delayed_work *delayed_work; |
56303d34 | 1149 | struct batadv_priv *bat_priv; |
807736f6 | 1150 | struct batadv_priv_bla *priv_bla; |
23721387 | 1151 | struct hlist_head *head; |
bae98774 | 1152 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1153 | struct batadv_hashtable *hash; |
56303d34 | 1154 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1155 | int i; |
1156 | ||
bbb1f90e | 1157 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1158 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1159 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1160 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1161 | if (!primary_if) |
1162 | goto out; | |
1163 | ||
3b300de3 SE |
1164 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1165 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1166 | |
1167 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1168 | goto out; | |
1169 | ||
807736f6 | 1170 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1171 | if (!hash) |
1172 | goto out; | |
1173 | ||
1174 | for (i = 0; i < hash->size; i++) { | |
1175 | head = &hash->table[i]; | |
1176 | ||
1177 | rcu_read_lock(); | |
b67bfe0d | 1178 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1179 | if (!batadv_compare_eth(backbone_gw->orig, |
1180 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1181 | continue; |
1182 | ||
1183 | backbone_gw->lasttime = jiffies; | |
1184 | ||
3b300de3 | 1185 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1186 | |
1187 | /* request_sent is only set after creation to avoid | |
1188 | * problems when we are not yet known as backbone gw | |
1189 | * in the backbone. | |
1190 | * | |
28709878 SW |
1191 | * We can reset this now after we waited some periods |
1192 | * to give bridge forward delays and bla group forming | |
1193 | * some grace time. | |
d807f272 SW |
1194 | */ |
1195 | ||
1196 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1197 | continue; | |
1198 | ||
28709878 SW |
1199 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1200 | continue; | |
1201 | ||
d807f272 SW |
1202 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1203 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1204 | } |
1205 | rcu_read_unlock(); | |
1206 | } | |
1207 | out: | |
1208 | if (primary_if) | |
e5d89254 | 1209 | batadv_hardif_free_ref(primary_if); |
23721387 | 1210 | |
72414442 AQ |
1211 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1212 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1213 | } |
1214 | ||
5d52dad2 SE |
1215 | /* The hash for claim and backbone hash receive the same key because they |
1216 | * are getting initialized by hash_new with the same key. Reinitializing | |
1217 | * them with to different keys to allow nested locking without generating | |
1218 | * lockdep warnings | |
1219 | */ | |
3b300de3 SE |
1220 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1221 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1222 | |
23721387 | 1223 | /* initialize all bla structures */ |
56303d34 | 1224 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1225 | { |
fe2da6ff | 1226 | int i; |
38ef3d1d | 1227 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1228 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1229 | uint16_t crc; |
1230 | unsigned long entrytime; | |
fe2da6ff | 1231 | |
7dac7b76 LL |
1232 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1233 | ||
39c75a51 | 1234 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1235 | |
38ef3d1d | 1236 | /* setting claim destination address */ |
807736f6 SE |
1237 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1238 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1239 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1240 | if (primary_if) { |
807736f6 SE |
1241 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1242 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1243 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1244 | } else { |
807736f6 | 1245 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1246 | } |
1247 | ||
fe2da6ff | 1248 | /* initialize the duplicate list */ |
807736f6 | 1249 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1250 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1251 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1252 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1253 | |
807736f6 | 1254 | if (bat_priv->bla.claim_hash) |
5346c35e | 1255 | return 0; |
23721387 | 1256 | |
807736f6 SE |
1257 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1258 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1259 | |
807736f6 | 1260 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1261 | return -ENOMEM; |
23721387 | 1262 | |
807736f6 | 1263 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1264 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1265 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1266 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1267 | |
39c75a51 | 1268 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1269 | |
72414442 AQ |
1270 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1271 | ||
1272 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1273 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1274 | return 0; |
23721387 SW |
1275 | } |
1276 | ||
2c53040f BH |
1277 | /** |
1278 | * batadv_bla_check_bcast_duplist | |
1279 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1280 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1281 | * |
1282 | * check if it is on our broadcast list. Another gateway might | |
1283 | * have sent the same packet because it is connected to the same backbone, | |
1284 | * so we have to remove this duplicate. | |
1285 | * | |
1286 | * This is performed by checking the CRC, which will tell us | |
1287 | * with a good chance that it is the same packet. If it is furthermore | |
1288 | * sent by another host, drop it. We allow equal packets from | |
1289 | * the same host however as this might be intended. | |
9cfc7bd6 | 1290 | */ |
56303d34 | 1291 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1292 | struct sk_buff *skb) |
fe2da6ff | 1293 | { |
004e86fc SW |
1294 | int i, curr, ret = 0; |
1295 | __be32 crc; | |
1296 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1297 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1298 | |
004e86fc | 1299 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1300 | |
1301 | /* calculate the crc ... */ | |
004e86fc | 1302 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1303 | |
7dac7b76 LL |
1304 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1305 | ||
42d0b044 | 1306 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1307 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1308 | curr %= BATADV_DUPLIST_SIZE; | |
1309 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1310 | |
1311 | /* we can stop searching if the entry is too old ; | |
1312 | * later entries will be even older | |
1313 | */ | |
42d0b044 SE |
1314 | if (batadv_has_timed_out(entry->entrytime, |
1315 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1316 | break; |
1317 | ||
1318 | if (entry->crc != crc) | |
1319 | continue; | |
1320 | ||
1eda58bf | 1321 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1322 | continue; |
1323 | ||
1324 | /* this entry seems to match: same crc, not too old, | |
1325 | * and from another gw. therefore return 1 to forbid it. | |
1326 | */ | |
7dac7b76 LL |
1327 | ret = 1; |
1328 | goto out; | |
fe2da6ff | 1329 | } |
7dac7b76 | 1330 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1331 | * and allow it, its the first occurrence. |
7dac7b76 | 1332 | */ |
807736f6 | 1333 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1334 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1335 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1336 | entry->crc = crc; |
1337 | entry->entrytime = jiffies; | |
8fdd0153 | 1338 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1339 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1340 | |
7dac7b76 LL |
1341 | out: |
1342 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1343 | ||
1344 | return ret; | |
fe2da6ff SW |
1345 | } |
1346 | ||
1b371d13 SW |
1347 | /** |
1348 | * batadv_bla_is_backbone_gw_orig | |
1349 | * @bat_priv: the bat priv with all the soft interface information | |
20ff9d59 | 1350 | * @orig: originator mac address |
cfd4f757 | 1351 | * @vid: VLAN identifier |
20ff9d59 | 1352 | * |
cfd4f757 | 1353 | * Check if the originator is a gateway for the VLAN identified by vid. |
20ff9d59 | 1354 | * |
cfd4f757 | 1355 | * Returns true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1356 | */ |
cfd4f757 AQ |
1357 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig, |
1358 | unsigned short vid) | |
20ff9d59 | 1359 | { |
807736f6 | 1360 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1361 | struct hlist_head *head; |
bae98774 | 1362 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1363 | int i; |
1364 | ||
1365 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1366 | return false; |
20ff9d59 SW |
1367 | |
1368 | if (!hash) | |
cfd4f757 | 1369 | return false; |
20ff9d59 SW |
1370 | |
1371 | for (i = 0; i < hash->size; i++) { | |
1372 | head = &hash->table[i]; | |
1373 | ||
1374 | rcu_read_lock(); | |
b67bfe0d | 1375 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1376 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1377 | backbone_gw->vid == vid) { | |
20ff9d59 | 1378 | rcu_read_unlock(); |
cfd4f757 | 1379 | return true; |
20ff9d59 SW |
1380 | } |
1381 | } | |
1382 | rcu_read_unlock(); | |
1383 | } | |
1384 | ||
cfd4f757 | 1385 | return false; |
20ff9d59 SW |
1386 | } |
1387 | ||
2c53040f BH |
1388 | /** |
1389 | * batadv_bla_is_backbone_gw | |
1390 | * @skb: the frame to be checked | |
23721387 SW |
1391 | * @orig_node: the orig_node of the frame |
1392 | * @hdr_size: maximum length of the frame | |
1393 | * | |
1394 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1395 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1396 | * returns 0. | |
23721387 | 1397 | */ |
08adf151 | 1398 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1399 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1400 | { |
bae98774 | 1401 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1402 | unsigned short vid; |
23721387 SW |
1403 | |
1404 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1405 | return 0; | |
1406 | ||
1407 | /* first, find out the vid. */ | |
0d125074 | 1408 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1409 | return 0; |
1410 | ||
c018ad3d | 1411 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1412 | |
1413 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1414 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1415 | orig_node->orig, vid); | |
23721387 SW |
1416 | if (!backbone_gw) |
1417 | return 0; | |
1418 | ||
3b300de3 | 1419 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1420 | return 1; |
1421 | } | |
1422 | ||
1423 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1424 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1425 | { |
56303d34 | 1426 | struct batadv_hard_iface *primary_if; |
23721387 | 1427 | |
807736f6 | 1428 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1429 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1430 | |
807736f6 | 1431 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1432 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1433 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1434 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1435 | } |
807736f6 | 1436 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1437 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1438 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1439 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1440 | } |
1441 | if (primary_if) | |
e5d89254 | 1442 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1443 | } |
1444 | ||
2c53040f BH |
1445 | /** |
1446 | * batadv_bla_rx | |
1447 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1448 | * @skb: the frame to be checked |
1449 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1450 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1451 | * |
1452 | * bla_rx avoidance checks if: | |
1453 | * * we have to race for a claim | |
1454 | * * if the frame is allowed on the LAN | |
1455 | * | |
1456 | * in these cases, the skb is further handled by this function and | |
1457 | * returns 1, otherwise it returns 0 and the caller shall further | |
1458 | * process the skb. | |
23721387 | 1459 | */ |
eb2deb6b AQ |
1460 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1461 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1462 | { |
1463 | struct ethhdr *ethhdr; | |
712bbfe4 | 1464 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1465 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1466 | int ret; |
1467 | ||
7ed4be95 | 1468 | ethhdr = eth_hdr(skb); |
23721387 | 1469 | |
e5d89254 | 1470 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1471 | if (!primary_if) |
1472 | goto handled; | |
1473 | ||
1474 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1475 | goto allow; | |
1476 | ||
807736f6 | 1477 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1478 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1479 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1480 | goto handled; |
1481 | ||
8fdd0153 | 1482 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1483 | search_claim.vid = vid; |
3b300de3 | 1484 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1485 | |
1486 | if (!claim) { | |
1487 | /* possible optimization: race for a claim */ | |
1488 | /* No claim exists yet, claim it for us! | |
1489 | */ | |
3b300de3 SE |
1490 | batadv_handle_claim(bat_priv, primary_if, |
1491 | primary_if->net_dev->dev_addr, | |
1492 | ethhdr->h_source, vid); | |
23721387 SW |
1493 | goto allow; |
1494 | } | |
1495 | ||
1496 | /* if it is our own claim ... */ | |
1eda58bf SE |
1497 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1498 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1499 | /* ... allow it in any case */ |
1500 | claim->lasttime = jiffies; | |
1501 | goto allow; | |
1502 | } | |
1503 | ||
1504 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1505 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1506 | /* ... drop it. the responsible gateway is in charge. | |
1507 | * | |
1508 | * We need to check is_bcast because with the gateway | |
1509 | * feature, broadcasts (like DHCP requests) may be sent | |
1510 | * using a unicast packet type. | |
1511 | */ | |
23721387 SW |
1512 | goto handled; |
1513 | } else { | |
1514 | /* seems the client considers us as its best gateway. | |
1515 | * send a claim and update the claim table | |
1516 | * immediately. | |
1517 | */ | |
3b300de3 SE |
1518 | batadv_handle_claim(bat_priv, primary_if, |
1519 | primary_if->net_dev->dev_addr, | |
1520 | ethhdr->h_source, vid); | |
23721387 SW |
1521 | goto allow; |
1522 | } | |
1523 | allow: | |
3b300de3 | 1524 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1525 | ret = 0; |
1526 | goto out; | |
1527 | ||
1528 | handled: | |
1529 | kfree_skb(skb); | |
1530 | ret = 1; | |
1531 | ||
1532 | out: | |
1533 | if (primary_if) | |
e5d89254 | 1534 | batadv_hardif_free_ref(primary_if); |
23721387 | 1535 | if (claim) |
3b300de3 | 1536 | batadv_claim_free_ref(claim); |
23721387 SW |
1537 | return ret; |
1538 | } | |
1539 | ||
2c53040f BH |
1540 | /** |
1541 | * batadv_bla_tx | |
1542 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1543 | * @skb: the frame to be checked |
1544 | * @vid: the VLAN ID of the frame | |
1545 | * | |
1546 | * bla_tx checks if: | |
1547 | * * a claim was received which has to be processed | |
1548 | * * the frame is allowed on the mesh | |
1549 | * | |
1550 | * in these cases, the skb is further handled by this function and | |
1551 | * returns 1, otherwise it returns 0 and the caller shall further | |
1552 | * process the skb. | |
9d2c9488 LL |
1553 | * |
1554 | * This call might reallocate skb data. | |
23721387 | 1555 | */ |
eb2deb6b AQ |
1556 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1557 | unsigned short vid) | |
23721387 SW |
1558 | { |
1559 | struct ethhdr *ethhdr; | |
712bbfe4 | 1560 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1561 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1562 | int ret = 0; |
1563 | ||
e5d89254 | 1564 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1565 | if (!primary_if) |
1566 | goto out; | |
1567 | ||
1568 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1569 | goto allow; | |
1570 | ||
3b300de3 | 1571 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1572 | goto handled; |
1573 | ||
7ed4be95 | 1574 | ethhdr = eth_hdr(skb); |
23721387 | 1575 | |
807736f6 | 1576 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1577 | /* don't allow broadcasts while requests are in flight */ |
1578 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1579 | goto handled; | |
1580 | ||
8fdd0153 | 1581 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1582 | search_claim.vid = vid; |
1583 | ||
3b300de3 | 1584 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1585 | |
1586 | /* if no claim exists, allow it. */ | |
1587 | if (!claim) | |
1588 | goto allow; | |
1589 | ||
1590 | /* check if we are responsible. */ | |
1eda58bf SE |
1591 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1592 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1593 | /* if yes, the client has roamed and we have |
1594 | * to unclaim it. | |
1595 | */ | |
3b300de3 SE |
1596 | batadv_handle_unclaim(bat_priv, primary_if, |
1597 | primary_if->net_dev->dev_addr, | |
1598 | ethhdr->h_source, vid); | |
23721387 SW |
1599 | goto allow; |
1600 | } | |
1601 | ||
1602 | /* check if it is a multicast/broadcast frame */ | |
1603 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1604 | /* drop it. the responsible gateway has forwarded it into | |
1605 | * the backbone network. | |
1606 | */ | |
1607 | goto handled; | |
1608 | } else { | |
1609 | /* we must allow it. at least if we are | |
1610 | * responsible for the DESTINATION. | |
1611 | */ | |
1612 | goto allow; | |
1613 | } | |
1614 | allow: | |
3b300de3 | 1615 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1616 | ret = 0; |
1617 | goto out; | |
1618 | handled: | |
1619 | ret = 1; | |
1620 | out: | |
1621 | if (primary_if) | |
e5d89254 | 1622 | batadv_hardif_free_ref(primary_if); |
23721387 | 1623 | if (claim) |
3b300de3 | 1624 | batadv_claim_free_ref(claim); |
23721387 SW |
1625 | return ret; |
1626 | } | |
9bf8e4d4 | 1627 | |
08adf151 | 1628 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1629 | { |
1630 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1631 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1632 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1633 | struct batadv_bla_claim *claim; |
56303d34 | 1634 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 SW |
1635 | struct hlist_head *head; |
1636 | uint32_t i; | |
1637 | bool is_own; | |
1eda58bf | 1638 | uint8_t *primary_addr; |
9bf8e4d4 | 1639 | |
30da63a6 ML |
1640 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1641 | if (!primary_if) | |
9bf8e4d4 | 1642 | goto out; |
9bf8e4d4 | 1643 | |
1eda58bf | 1644 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1645 | seq_printf(seq, |
39a32991 | 1646 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1647 | net_dev->name, primary_addr, |
807736f6 | 1648 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1649 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1650 | "Client", "VID", "Originator", "CRC"); |
1651 | for (i = 0; i < hash->size; i++) { | |
1652 | head = &hash->table[i]; | |
1653 | ||
1654 | rcu_read_lock(); | |
b67bfe0d | 1655 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1656 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1657 | primary_addr); | |
eb2deb6b | 1658 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1659 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1660 | claim->backbone_gw->orig, |
1661 | (is_own ? 'x' : ' '), | |
1662 | claim->backbone_gw->crc); | |
1663 | } | |
1664 | rcu_read_unlock(); | |
1665 | } | |
1666 | out: | |
1667 | if (primary_if) | |
e5d89254 | 1668 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1669 | return 0; |
9bf8e4d4 | 1670 | } |
536a23f1 SW |
1671 | |
1672 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1673 | { | |
1674 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1675 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1676 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1677 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1678 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1679 | struct hlist_head *head; |
1680 | int secs, msecs; | |
1681 | uint32_t i; | |
1682 | bool is_own; | |
536a23f1 SW |
1683 | uint8_t *primary_addr; |
1684 | ||
30da63a6 ML |
1685 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1686 | if (!primary_if) | |
536a23f1 | 1687 | goto out; |
536a23f1 SW |
1688 | |
1689 | primary_addr = primary_if->net_dev->dev_addr; | |
1690 | seq_printf(seq, | |
39a32991 | 1691 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1692 | net_dev->name, primary_addr, |
807736f6 | 1693 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1694 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1695 | "Originator", "VID", "last seen", "CRC"); |
1696 | for (i = 0; i < hash->size; i++) { | |
1697 | head = &hash->table[i]; | |
1698 | ||
1699 | rcu_read_lock(); | |
b67bfe0d | 1700 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1701 | msecs = jiffies_to_msecs(jiffies - |
1702 | backbone_gw->lasttime); | |
1703 | secs = msecs / 1000; | |
1704 | msecs = msecs % 1000; | |
1705 | ||
1706 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1707 | primary_addr); | |
1708 | if (is_own) | |
1709 | continue; | |
1710 | ||
eb2deb6b | 1711 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1712 | backbone_gw->orig, |
1713 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
eb2deb6b | 1714 | msecs, backbone_gw->crc); |
536a23f1 SW |
1715 | } |
1716 | rcu_read_unlock(); | |
1717 | } | |
1718 | out: | |
1719 | if (primary_if) | |
1720 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1721 | return 0; |
536a23f1 | 1722 | } |