Commit | Line | Data |
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0046b040 | 1 | /* Copyright (C) 2011-2016 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 | ||
23721387 | 18 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 19 | #include "main.h" |
23721387 | 20 | |
1e2c2a4f SE |
21 | #include <linux/atomic.h> |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
23721387 | 24 | #include <linux/crc16.h> |
1e2c2a4f SE |
25 | #include <linux/errno.h> |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
23721387 | 28 | #include <linux/if_arp.h> |
1e2c2a4f | 29 | #include <linux/if_ether.h> |
23721387 | 30 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
31 | #include <linux/jhash.h> |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/kernel.h> | |
06e56ded | 34 | #include <linux/kref.h> |
1e2c2a4f SE |
35 | #include <linux/list.h> |
36 | #include <linux/lockdep.h> | |
37 | #include <linux/netdevice.h> | |
04f3f5bf | 38 | #include <linux/netlink.h> |
1e2c2a4f SE |
39 | #include <linux/rculist.h> |
40 | #include <linux/rcupdate.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/spinlock.h> | |
45 | #include <linux/stddef.h> | |
46 | #include <linux/string.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <net/arp.h> | |
04f3f5bf AL |
49 | #include <net/genetlink.h> |
50 | #include <net/netlink.h> | |
51 | #include <net/sock.h> | |
52 | #include <uapi/linux/batman_adv.h> | |
1e2c2a4f SE |
53 | |
54 | #include "hard-interface.h" | |
55 | #include "hash.h" | |
ba412080 | 56 | #include "log.h" |
04f3f5bf | 57 | #include "netlink.h" |
1e2c2a4f SE |
58 | #include "originator.h" |
59 | #include "packet.h" | |
04f3f5bf | 60 | #include "soft-interface.h" |
cd9c7bfb | 61 | #include "sysfs.h" |
1e2c2a4f | 62 | #include "translation-table.h" |
23721387 | 63 | |
6b5e971a | 64 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 65 | |
3b300de3 | 66 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
67 | static void |
68 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
69 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 70 | |
62fe710f | 71 | /** |
04e14be6 SW |
72 | * batadv_choose_claim - choose the right bucket for a claim. |
73 | * @data: data to hash | |
74 | * @size: size of the hash table | |
62fe710f | 75 | * |
04e14be6 | 76 | * Return: the hash index of the claim |
62fe710f | 77 | */ |
6b5e971a | 78 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 79 | { |
712bbfe4 | 80 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 81 | u32 hash = 0; |
23721387 | 82 | |
36fd61cb SE |
83 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
84 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
85 | |
86 | return hash % size; | |
87 | } | |
88 | ||
62fe710f | 89 | /** |
04e14be6 SW |
90 | * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway. |
91 | * @data: data to hash | |
92 | * @size: size of the hash table | |
62fe710f | 93 | * |
04e14be6 | 94 | * Return: the hash index of the backbone gateway |
62fe710f | 95 | */ |
6b5e971a | 96 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 97 | { |
712bbfe4 | 98 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 99 | u32 hash = 0; |
23721387 | 100 | |
36fd61cb SE |
101 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
102 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
103 | |
104 | return hash % size; | |
105 | } | |
106 | ||
04e14be6 SW |
107 | /** |
108 | * batadv_compare_backbone_gw - compare address and vid of two backbone gws | |
109 | * @node: list node of the first entry to compare | |
110 | * @data2: pointer to the second backbone gateway | |
111 | * | |
4b426b10 | 112 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 113 | */ |
4b426b10 SE |
114 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
115 | const void *data2) | |
23721387 | 116 | { |
bae98774 | 117 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 118 | hash_entry); |
4f248cff SE |
119 | const struct batadv_bla_backbone_gw *gw1 = data1; |
120 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 121 | |
c76d1525 | 122 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 123 | return false; |
c76d1525 SW |
124 | |
125 | if (gw1->vid != gw2->vid) | |
4b426b10 | 126 | return false; |
c76d1525 | 127 | |
4b426b10 | 128 | return true; |
23721387 SW |
129 | } |
130 | ||
04e14be6 | 131 | /** |
98a5b1d8 | 132 | * batadv_compare_claim - compare address and vid of two claims |
04e14be6 SW |
133 | * @node: list node of the first entry to compare |
134 | * @data2: pointer to the second claims | |
135 | * | |
4b426b10 | 136 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 137 | */ |
4b426b10 SE |
138 | static bool batadv_compare_claim(const struct hlist_node *node, |
139 | const void *data2) | |
23721387 | 140 | { |
712bbfe4 | 141 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 142 | hash_entry); |
4f248cff SE |
143 | const struct batadv_bla_claim *cl1 = data1; |
144 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
145 | |
146 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 147 | return false; |
c76d1525 SW |
148 | |
149 | if (cl1->vid != cl2->vid) | |
4b426b10 | 150 | return false; |
23721387 | 151 | |
4b426b10 | 152 | return true; |
23721387 SW |
153 | } |
154 | ||
04e14be6 | 155 | /** |
06e56ded SE |
156 | * batadv_backbone_gw_release - release backbone gw from lists and queue for |
157 | * free after rcu grace period | |
158 | * @ref: kref pointer of the backbone gw | |
159 | */ | |
160 | static void batadv_backbone_gw_release(struct kref *ref) | |
161 | { | |
162 | struct batadv_bla_backbone_gw *backbone_gw; | |
163 | ||
164 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
165 | refcount); | |
166 | ||
167 | kfree_rcu(backbone_gw, rcu); | |
168 | } | |
169 | ||
170 | /** | |
c8b86c12 SE |
171 | * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly |
172 | * release it | |
04e14be6 SW |
173 | * @backbone_gw: backbone gateway to be free'd |
174 | */ | |
c8b86c12 | 175 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 176 | { |
06e56ded | 177 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
178 | } |
179 | ||
04e14be6 SW |
180 | /** |
181 | * batadv_claim_release - release claim from lists and queue for free after rcu | |
182 | * grace period | |
183 | * @ref: kref pointer of the claim | |
184 | */ | |
71b7e3d3 | 185 | static void batadv_claim_release(struct kref *ref) |
23721387 | 186 | { |
71b7e3d3 | 187 | struct batadv_bla_claim *claim; |
3db0decf | 188 | struct batadv_bla_backbone_gw *old_backbone_gw; |
71b7e3d3 SE |
189 | |
190 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
191 | ||
3db0decf SE |
192 | spin_lock_bh(&claim->backbone_lock); |
193 | old_backbone_gw = claim->backbone_gw; | |
194 | claim->backbone_gw = NULL; | |
195 | spin_unlock_bh(&claim->backbone_lock); | |
196 | ||
197 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
198 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
199 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
200 | ||
201 | batadv_backbone_gw_put(old_backbone_gw); | |
202 | ||
63b39927 | 203 | kfree_rcu(claim, rcu); |
23721387 SW |
204 | } |
205 | ||
04e14be6 | 206 | /** |
321e3e08 | 207 | * batadv_claim_put - decrement the claim refcounter and possibly |
ec9b83ca | 208 | * release it |
04e14be6 SW |
209 | * @claim: claim to be free'd |
210 | */ | |
321e3e08 | 211 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
23721387 | 212 | { |
71b7e3d3 | 213 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
214 | } |
215 | ||
1b371d13 | 216 | /** |
04e14be6 | 217 | * batadv_claim_hash_find - looks for a claim in the claim hash |
1b371d13 | 218 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
219 | * @data: search data (may be local/static data) |
220 | * | |
62fe710f | 221 | * Return: claim if found or NULL otherwise. |
23721387 | 222 | */ |
6fc77a54 SE |
223 | static struct batadv_bla_claim * |
224 | batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
225 | struct batadv_bla_claim *data) | |
23721387 | 226 | { |
807736f6 | 227 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 228 | struct hlist_head *head; |
712bbfe4 ML |
229 | struct batadv_bla_claim *claim; |
230 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
231 | int index; |
232 | ||
233 | if (!hash) | |
234 | return NULL; | |
235 | ||
3b300de3 | 236 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
237 | head = &hash->table[index]; |
238 | ||
239 | rcu_read_lock(); | |
b67bfe0d | 240 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 241 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
242 | continue; |
243 | ||
71b7e3d3 | 244 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
245 | continue; |
246 | ||
247 | claim_tmp = claim; | |
248 | break; | |
249 | } | |
250 | rcu_read_unlock(); | |
251 | ||
252 | return claim_tmp; | |
253 | } | |
254 | ||
2c53040f | 255 | /** |
04e14be6 | 256 | * batadv_backbone_hash_find - looks for a backbone gateway in the hash |
2c53040f | 257 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
258 | * @addr: the address of the originator |
259 | * @vid: the VLAN ID | |
260 | * | |
04e14be6 | 261 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 262 | */ |
bae98774 | 263 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
264 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
265 | unsigned short vid) | |
23721387 | 266 | { |
807736f6 | 267 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 268 | struct hlist_head *head; |
bae98774 ML |
269 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
270 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
271 | int index; |
272 | ||
273 | if (!hash) | |
274 | return NULL; | |
275 | ||
8fdd0153 | 276 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
277 | search_entry.vid = vid; |
278 | ||
3b300de3 | 279 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
280 | head = &hash->table[index]; |
281 | ||
282 | rcu_read_lock(); | |
b67bfe0d | 283 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
284 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
285 | &search_entry)) | |
23721387 SW |
286 | continue; |
287 | ||
06e56ded | 288 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
289 | continue; |
290 | ||
291 | backbone_gw_tmp = backbone_gw; | |
292 | break; | |
293 | } | |
294 | rcu_read_unlock(); | |
295 | ||
296 | return backbone_gw_tmp; | |
297 | } | |
298 | ||
04e14be6 SW |
299 | /** |
300 | * batadv_bla_del_backbone_claims - delete all claims for a backbone | |
301 | * @backbone_gw: backbone gateway where the claims should be removed | |
302 | */ | |
56303d34 | 303 | static void |
bae98774 | 304 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 305 | { |
5bf74e9c | 306 | struct batadv_hashtable *hash; |
b67bfe0d | 307 | struct hlist_node *node_tmp; |
23721387 | 308 | struct hlist_head *head; |
712bbfe4 | 309 | struct batadv_bla_claim *claim; |
23721387 SW |
310 | int i; |
311 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
312 | ||
807736f6 | 313 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
314 | if (!hash) |
315 | return; | |
316 | ||
317 | for (i = 0; i < hash->size; i++) { | |
318 | head = &hash->table[i]; | |
319 | list_lock = &hash->list_locks[i]; | |
320 | ||
321 | spin_lock_bh(list_lock); | |
b67bfe0d | 322 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 323 | head, hash_entry) { |
23721387 SW |
324 | if (claim->backbone_gw != backbone_gw) |
325 | continue; | |
326 | ||
321e3e08 | 327 | batadv_claim_put(claim); |
b67bfe0d | 328 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
329 | } |
330 | spin_unlock_bh(list_lock); | |
331 | } | |
332 | ||
3f68785e | 333 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 334 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 335 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 336 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
337 | } |
338 | ||
2c53040f BH |
339 | /** |
340 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
341 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 342 | * @mac: the mac address to be announced within the claim |
23721387 SW |
343 | * @vid: the VLAN ID |
344 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 345 | */ |
6b5e971a | 346 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 347 | unsigned short vid, int claimtype) |
23721387 SW |
348 | { |
349 | struct sk_buff *skb; | |
350 | struct ethhdr *ethhdr; | |
56303d34 | 351 | struct batadv_hard_iface *primary_if; |
23721387 | 352 | struct net_device *soft_iface; |
6b5e971a | 353 | u8 *hw_src; |
96412690 | 354 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 355 | __be32 zeroip = 0; |
23721387 | 356 | |
e5d89254 | 357 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
358 | if (!primary_if) |
359 | return; | |
360 | ||
807736f6 | 361 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 362 | sizeof(local_claim_dest)); |
23721387 SW |
363 | local_claim_dest.type = claimtype; |
364 | ||
365 | soft_iface = primary_if->soft_iface; | |
366 | ||
367 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
368 | /* IP DST: 0.0.0.0 */ | |
369 | zeroip, | |
370 | primary_if->soft_iface, | |
371 | /* IP SRC: 0.0.0.0 */ | |
372 | zeroip, | |
373 | /* Ethernet DST: Broadcast */ | |
374 | NULL, | |
375 | /* Ethernet SRC/HW SRC: originator mac */ | |
376 | primary_if->net_dev->dev_addr, | |
99e966fc | 377 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 378 | * with XX = claim type |
38ef3d1d | 379 | * and YY:YY = group id |
23721387 | 380 | */ |
6b5e971a | 381 | (u8 *)&local_claim_dest); |
23721387 SW |
382 | |
383 | if (!skb) | |
384 | goto out; | |
385 | ||
386 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 387 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
388 | |
389 | /* now we pretend that the client would have sent this ... */ | |
390 | switch (claimtype) { | |
3eb8773e | 391 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
392 | /* normal claim frame |
393 | * set Ethernet SRC to the clients mac | |
394 | */ | |
8fdd0153 | 395 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 396 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
397 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
398 | BATADV_PRINT_VID(vid)); | |
23721387 | 399 | break; |
3eb8773e | 400 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
401 | /* unclaim frame |
402 | * set HW SRC to the clients mac | |
403 | */ | |
8fdd0153 | 404 | ether_addr_copy(hw_src, mac); |
39c75a51 | 405 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 406 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 407 | BATADV_PRINT_VID(vid)); |
23721387 | 408 | break; |
acd34afa | 409 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
410 | /* announcement frame |
411 | * set HW SRC to the special mac containg the crc | |
412 | */ | |
8fdd0153 | 413 | ether_addr_copy(hw_src, mac); |
39c75a51 | 414 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 415 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 416 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 417 | break; |
acd34afa | 418 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 419 | /* request frame |
99e966fc SW |
420 | * set HW SRC and header destination to the receiving backbone |
421 | * gws mac | |
23721387 | 422 | */ |
8fdd0153 AQ |
423 | ether_addr_copy(hw_src, mac); |
424 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 425 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 426 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
427 | ethhdr->h_source, ethhdr->h_dest, |
428 | BATADV_PRINT_VID(vid)); | |
23721387 | 429 | break; |
cd9c7bfb SW |
430 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
431 | ether_addr_copy(ethhdr->h_source, mac); | |
432 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
433 | "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n", | |
434 | ethhdr->h_source, ethhdr->h_dest, | |
435 | BATADV_PRINT_VID(vid)); | |
436 | ||
437 | break; | |
23721387 SW |
438 | } |
439 | ||
10c78f58 | 440 | if (vid & BATADV_VLAN_HAS_TAG) { |
eb2deb6b AQ |
441 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
442 | vid & VLAN_VID_MASK); | |
10c78f58 SE |
443 | if (!skb) |
444 | goto out; | |
445 | } | |
23721387 SW |
446 | |
447 | skb_reset_mac_header(skb); | |
448 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
449 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
450 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
451 | skb->len + ETH_HLEN); | |
23721387 SW |
452 | soft_iface->last_rx = jiffies; |
453 | ||
454 | netif_rx(skb); | |
455 | out: | |
456 | if (primary_if) | |
82047ad7 | 457 | batadv_hardif_put(primary_if); |
23721387 SW |
458 | } |
459 | ||
cd9c7bfb SW |
460 | /** |
461 | * batadv_bla_loopdetect_report - worker for reporting the loop | |
462 | * @work: work queue item | |
463 | * | |
464 | * Throws an uevent, as the loopdetect check function can't do that itself | |
465 | * since the kernel may sleep while throwing uevents. | |
466 | */ | |
467 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
468 | { | |
469 | struct batadv_bla_backbone_gw *backbone_gw; | |
470 | struct batadv_priv *bat_priv; | |
471 | char vid_str[6] = { '\0' }; | |
472 | ||
473 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
474 | report_work); | |
475 | bat_priv = backbone_gw->bat_priv; | |
476 | ||
477 | batadv_info(bat_priv->soft_iface, | |
478 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
479 | BATADV_PRINT_VID(backbone_gw->vid)); | |
480 | snprintf(vid_str, sizeof(vid_str), "%d", | |
481 | BATADV_PRINT_VID(backbone_gw->vid)); | |
482 | vid_str[sizeof(vid_str) - 1] = 0; | |
483 | ||
484 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
485 | vid_str); | |
486 | ||
487 | batadv_backbone_gw_put(backbone_gw); | |
488 | } | |
489 | ||
2c53040f | 490 | /** |
04e14be6 | 491 | * batadv_bla_get_backbone_gw - finds or creates a backbone gateway |
2c53040f | 492 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
493 | * @orig: the mac address of the originator |
494 | * @vid: the VLAN ID | |
e3357189 | 495 | * @own_backbone: set if the requested backbone is local |
23721387 | 496 | * |
04e14be6 | 497 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 498 | */ |
bae98774 | 499 | static struct batadv_bla_backbone_gw * |
6b5e971a | 500 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 501 | unsigned short vid, bool own_backbone) |
23721387 | 502 | { |
bae98774 | 503 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 504 | struct batadv_orig_node *orig_node; |
23721387 SW |
505 | int hash_added; |
506 | ||
3b300de3 | 507 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
508 | |
509 | if (entry) | |
510 | return entry; | |
511 | ||
39c75a51 | 512 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 513 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 514 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
515 | |
516 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
517 | if (!entry) | |
518 | return NULL; | |
519 | ||
520 | entry->vid = vid; | |
521 | entry->lasttime = jiffies; | |
3964f728 | 522 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 523 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 524 | spin_lock_init(&entry->crc_lock); |
23721387 | 525 | atomic_set(&entry->request_sent, 0); |
28709878 | 526 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 527 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 528 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
23721387 SW |
529 | |
530 | /* one for the hash, one for returning */ | |
06e56ded SE |
531 | kref_init(&entry->refcount); |
532 | kref_get(&entry->refcount); | |
23721387 | 533 | |
807736f6 | 534 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
535 | batadv_compare_backbone_gw, |
536 | batadv_choose_backbone_gw, entry, | |
537 | &entry->hash_entry); | |
23721387 SW |
538 | |
539 | if (unlikely(hash_added != 0)) { | |
540 | /* hash failed, free the structure */ | |
541 | kfree(entry); | |
542 | return NULL; | |
543 | } | |
544 | ||
95fb130d | 545 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 546 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 547 | if (orig_node) { |
95fb130d | 548 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 549 | "became a backbone gateway"); |
5d967310 | 550 | batadv_orig_node_put(orig_node); |
20ff9d59 | 551 | } |
52aebd6a | 552 | |
d807f272 | 553 | if (own_backbone) { |
52aebd6a SW |
554 | batadv_bla_send_announce(bat_priv, entry); |
555 | ||
d807f272 SW |
556 | /* this will be decreased in the worker thread */ |
557 | atomic_inc(&entry->request_sent); | |
28709878 | 558 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
559 | atomic_inc(&bat_priv->bla.num_requests); |
560 | } | |
561 | ||
23721387 SW |
562 | return entry; |
563 | } | |
564 | ||
04e14be6 SW |
565 | /** |
566 | * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN | |
567 | * @bat_priv: the bat priv with all the soft interface information | |
568 | * @primary_if: the selected primary interface | |
569 | * @vid: VLAN identifier | |
570 | * | |
571 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
572 | * where we receive other backbone gws |
573 | */ | |
56303d34 SE |
574 | static void |
575 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
576 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 577 | unsigned short vid) |
23721387 | 578 | { |
bae98774 | 579 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 580 | |
3b300de3 SE |
581 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
582 | primary_if->net_dev->dev_addr, | |
52aebd6a | 583 | vid, true); |
23721387 SW |
584 | if (unlikely(!backbone_gw)) |
585 | return; | |
586 | ||
587 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 588 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
589 | } |
590 | ||
1b371d13 SW |
591 | /** |
592 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
593 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 594 | * @primary_if: interface where the request came on |
23721387 SW |
595 | * @vid: the vid where the request came on |
596 | * | |
597 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
598 | * to allow the requester another check if the CRC is correct now. | |
599 | */ | |
56303d34 SE |
600 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
601 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 602 | unsigned short vid) |
23721387 | 603 | { |
23721387 | 604 | struct hlist_head *head; |
5bf74e9c | 605 | struct batadv_hashtable *hash; |
712bbfe4 | 606 | struct batadv_bla_claim *claim; |
bae98774 | 607 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
608 | int i; |
609 | ||
39c75a51 | 610 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 611 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 612 | |
3b300de3 SE |
613 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
614 | primary_if->net_dev->dev_addr, | |
615 | vid); | |
23721387 SW |
616 | if (!backbone_gw) |
617 | return; | |
618 | ||
807736f6 | 619 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
620 | for (i = 0; i < hash->size; i++) { |
621 | head = &hash->table[i]; | |
622 | ||
623 | rcu_read_lock(); | |
b67bfe0d | 624 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
625 | /* only own claims are interesting */ |
626 | if (claim->backbone_gw != backbone_gw) | |
627 | continue; | |
628 | ||
3b300de3 | 629 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 630 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
631 | } |
632 | rcu_read_unlock(); | |
633 | } | |
634 | ||
635 | /* finally, send an announcement frame */ | |
3b300de3 | 636 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 637 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
638 | } |
639 | ||
1b371d13 SW |
640 | /** |
641 | * batadv_bla_send_request - send a request to repeat claims | |
642 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
643 | * |
644 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
645 | * After the request, it will repeat all of his own claims and finally | |
646 | * send an announcement claim with which we can check again. | |
647 | */ | |
bae98774 | 648 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
649 | { |
650 | /* first, remove all old entries */ | |
3b300de3 | 651 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 652 | |
39c75a51 SE |
653 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
654 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
655 | |
656 | /* send request */ | |
3b300de3 | 657 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 658 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
659 | |
660 | /* no local broadcasts should be sent or received, for now. */ | |
661 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 662 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
663 | atomic_set(&backbone_gw->request_sent, 1); |
664 | } | |
665 | } | |
666 | ||
1b371d13 | 667 | /** |
04e14be6 | 668 | * batadv_bla_send_announce - Send an announcement frame |
1b371d13 | 669 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 670 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 671 | */ |
56303d34 | 672 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 673 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 674 | { |
6b5e971a | 675 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 676 | __be16 crc; |
23721387 | 677 | |
3b300de3 | 678 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 679 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 680 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 681 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 682 | memcpy(&mac[4], &crc, 2); |
23721387 | 683 | |
3b300de3 | 684 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 685 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
686 | } |
687 | ||
2c53040f BH |
688 | /** |
689 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
690 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
691 | * @mac: the mac address of the claim |
692 | * @vid: the VLAN ID of the frame | |
693 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 694 | */ |
56303d34 | 695 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 696 | const u8 *mac, const unsigned short vid, |
bae98774 | 697 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 698 | { |
3db0decf | 699 | struct batadv_bla_backbone_gw *old_backbone_gw; |
712bbfe4 ML |
700 | struct batadv_bla_claim *claim; |
701 | struct batadv_bla_claim search_claim; | |
3db0decf | 702 | bool remove_crc = false; |
23721387 SW |
703 | int hash_added; |
704 | ||
8fdd0153 | 705 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 706 | search_claim.vid = vid; |
3b300de3 | 707 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
708 | |
709 | /* create a new claim entry if it does not exist yet. */ | |
710 | if (!claim) { | |
711 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
712 | if (!claim) | |
713 | return; | |
714 | ||
8fdd0153 | 715 | ether_addr_copy(claim->addr, mac); |
3db0decf | 716 | spin_lock_init(&claim->backbone_lock); |
23721387 SW |
717 | claim->vid = vid; |
718 | claim->lasttime = jiffies; | |
3db0decf | 719 | kref_get(&backbone_gw->refcount); |
23721387 SW |
720 | claim->backbone_gw = backbone_gw; |
721 | ||
71b7e3d3 SE |
722 | kref_init(&claim->refcount); |
723 | kref_get(&claim->refcount); | |
39c75a51 | 724 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 725 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 726 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 727 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
728 | batadv_compare_claim, |
729 | batadv_choose_claim, claim, | |
730 | &claim->hash_entry); | |
23721387 SW |
731 | |
732 | if (unlikely(hash_added != 0)) { | |
733 | /* only local changes happened. */ | |
734 | kfree(claim); | |
735 | return; | |
736 | } | |
737 | } else { | |
738 | claim->lasttime = jiffies; | |
739 | if (claim->backbone_gw == backbone_gw) | |
740 | /* no need to register a new backbone */ | |
741 | goto claim_free_ref; | |
742 | ||
39c75a51 | 743 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 744 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 745 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 746 | |
3db0decf | 747 | remove_crc = true; |
23721387 | 748 | } |
3db0decf SE |
749 | |
750 | /* replace backbone_gw atomically and adjust reference counters */ | |
751 | spin_lock_bh(&claim->backbone_lock); | |
752 | old_backbone_gw = claim->backbone_gw; | |
06e56ded | 753 | kref_get(&backbone_gw->refcount); |
23721387 | 754 | claim->backbone_gw = backbone_gw; |
3db0decf | 755 | spin_unlock_bh(&claim->backbone_lock); |
23721387 | 756 | |
3db0decf SE |
757 | if (remove_crc) { |
758 | /* remove claim address from old backbone_gw */ | |
759 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
760 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
761 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
762 | } | |
23721387 | 763 | |
3db0decf SE |
764 | batadv_backbone_gw_put(old_backbone_gw); |
765 | ||
766 | /* add claim address to new backbone_gw */ | |
5a1dd8a4 | 767 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 768 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 769 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
770 | backbone_gw->lasttime = jiffies; |
771 | ||
772 | claim_free_ref: | |
321e3e08 | 773 | batadv_claim_put(claim); |
23721387 SW |
774 | } |
775 | ||
3db0decf SE |
776 | /** |
777 | * batadv_bla_claim_get_backbone_gw - Get valid reference for backbone_gw of | |
778 | * claim | |
779 | * @claim: claim whose backbone_gw should be returned | |
780 | * | |
781 | * Return: valid reference to claim::backbone_gw | |
782 | */ | |
783 | static struct batadv_bla_backbone_gw * | |
784 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) | |
785 | { | |
786 | struct batadv_bla_backbone_gw *backbone_gw; | |
787 | ||
788 | spin_lock_bh(&claim->backbone_lock); | |
789 | backbone_gw = claim->backbone_gw; | |
790 | kref_get(&backbone_gw->refcount); | |
791 | spin_unlock_bh(&claim->backbone_lock); | |
792 | ||
793 | return backbone_gw; | |
794 | } | |
795 | ||
04e14be6 SW |
796 | /** |
797 | * batadv_bla_del_claim - delete a claim from the claim hash | |
798 | * @bat_priv: the bat priv with all the soft interface information | |
799 | * @mac: mac address of the claim to be removed | |
800 | * @vid: VLAN id for the claim to be removed | |
23721387 | 801 | */ |
56303d34 | 802 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 803 | const u8 *mac, const unsigned short vid) |
23721387 | 804 | { |
712bbfe4 | 805 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 806 | |
8fdd0153 | 807 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 808 | search_claim.vid = vid; |
3b300de3 | 809 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
810 | if (!claim) |
811 | return; | |
812 | ||
39c75a51 | 813 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 814 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 815 | |
807736f6 | 816 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 | 817 | batadv_choose_claim, claim); |
321e3e08 | 818 | batadv_claim_put(claim); /* reference from the hash is gone */ |
23721387 | 819 | |
23721387 | 820 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 821 | batadv_claim_put(claim); |
23721387 SW |
822 | } |
823 | ||
62fe710f SE |
824 | /** |
825 | * batadv_handle_announce - check for ANNOUNCE frame | |
04e14be6 SW |
826 | * @bat_priv: the bat priv with all the soft interface information |
827 | * @an_addr: announcement mac address (ARP Sender HW address) | |
828 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
829 | * @vid: the VLAN ID of the frame | |
62fe710f | 830 | * |
4b426b10 | 831 | * Return: true if handled |
62fe710f | 832 | */ |
4b426b10 SE |
833 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
834 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 835 | { |
bae98774 | 836 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 837 | u16 backbone_crc, crc; |
23721387 | 838 | |
3b300de3 | 839 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 840 | return false; |
23721387 | 841 | |
52aebd6a SW |
842 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
843 | false); | |
23721387 SW |
844 | |
845 | if (unlikely(!backbone_gw)) | |
4b426b10 | 846 | return true; |
23721387 | 847 | |
23721387 SW |
848 | /* handle as ANNOUNCE frame */ |
849 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 850 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 851 | |
39c75a51 | 852 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 853 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 854 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 855 | |
5a1dd8a4 SW |
856 | spin_lock_bh(&backbone_gw->crc_lock); |
857 | backbone_crc = backbone_gw->crc; | |
858 | spin_unlock_bh(&backbone_gw->crc_lock); | |
859 | ||
860 | if (backbone_crc != crc) { | |
39c75a51 | 861 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 862 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
863 | backbone_gw->orig, |
864 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 865 | backbone_crc, crc); |
23721387 | 866 | |
3b300de3 | 867 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
868 | } else { |
869 | /* if we have sent a request and the crc was OK, | |
870 | * we can allow traffic again. | |
871 | */ | |
872 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 873 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
874 | atomic_set(&backbone_gw->request_sent, 0); |
875 | } | |
876 | } | |
877 | ||
c8b86c12 | 878 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 879 | return true; |
23721387 SW |
880 | } |
881 | ||
62fe710f SE |
882 | /** |
883 | * batadv_handle_request - check for REQUEST frame | |
04e14be6 SW |
884 | * @bat_priv: the bat priv with all the soft interface information |
885 | * @primary_if: the primary hard interface of this batman soft interface | |
886 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
887 | * @ethhdr: ethernet header of a packet | |
888 | * @vid: the VLAN ID of the frame | |
62fe710f | 889 | * |
4b426b10 | 890 | * Return: true if handled |
62fe710f | 891 | */ |
4b426b10 SE |
892 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
893 | struct batadv_hard_iface *primary_if, | |
894 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
895 | unsigned short vid) | |
23721387 SW |
896 | { |
897 | /* check for REQUEST frame */ | |
1eda58bf | 898 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 899 | return false; |
23721387 SW |
900 | |
901 | /* sanity check, this should not happen on a normal switch, | |
902 | * we ignore it in this case. | |
903 | */ | |
1eda58bf | 904 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 905 | return true; |
23721387 | 906 | |
39c75a51 | 907 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 908 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 909 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 910 | |
3b300de3 | 911 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 912 | return true; |
23721387 SW |
913 | } |
914 | ||
62fe710f SE |
915 | /** |
916 | * batadv_handle_unclaim - check for UNCLAIM frame | |
04e14be6 SW |
917 | * @bat_priv: the bat priv with all the soft interface information |
918 | * @primary_if: the primary hard interface of this batman soft interface | |
919 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
920 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
921 | * @vid: the VLAN ID of the frame | |
62fe710f | 922 | * |
4b426b10 | 923 | * Return: true if handled |
62fe710f | 924 | */ |
4b426b10 SE |
925 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
926 | struct batadv_hard_iface *primary_if, | |
927 | u8 *backbone_addr, u8 *claim_addr, | |
928 | unsigned short vid) | |
23721387 | 929 | { |
bae98774 | 930 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
931 | |
932 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
933 | if (primary_if && batadv_compare_eth(backbone_addr, |
934 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 935 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 936 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 937 | |
3b300de3 | 938 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
939 | |
940 | if (!backbone_gw) | |
4b426b10 | 941 | return true; |
23721387 SW |
942 | |
943 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 944 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 945 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 946 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 947 | |
3b300de3 | 948 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 949 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 950 | return true; |
23721387 SW |
951 | } |
952 | ||
62fe710f SE |
953 | /** |
954 | * batadv_handle_claim - check for CLAIM frame | |
04e14be6 SW |
955 | * @bat_priv: the bat priv with all the soft interface information |
956 | * @primary_if: the primary hard interface of this batman soft interface | |
957 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
958 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
959 | * @vid: the VLAN ID of the frame | |
62fe710f | 960 | * |
4b426b10 | 961 | * Return: true if handled |
62fe710f | 962 | */ |
4b426b10 SE |
963 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
964 | struct batadv_hard_iface *primary_if, | |
965 | u8 *backbone_addr, u8 *claim_addr, | |
966 | unsigned short vid) | |
23721387 | 967 | { |
bae98774 | 968 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
969 | |
970 | /* register the gateway if not yet available, and add the claim. */ | |
971 | ||
52aebd6a SW |
972 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
973 | false); | |
23721387 SW |
974 | |
975 | if (unlikely(!backbone_gw)) | |
4b426b10 | 976 | return true; |
23721387 SW |
977 | |
978 | /* this must be a CLAIM frame */ | |
3b300de3 | 979 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 980 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 981 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 982 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
983 | |
984 | /* TODO: we could call something like tt_local_del() here. */ | |
985 | ||
c8b86c12 | 986 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 987 | return true; |
23721387 SW |
988 | } |
989 | ||
2c53040f | 990 | /** |
04e14be6 | 991 | * batadv_check_claim_group - check for claim group membership |
2c53040f | 992 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 993 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
994 | * @hw_src: the Hardware source in the ARP Header |
995 | * @hw_dst: the Hardware destination in the ARP Header | |
996 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
997 | * | |
998 | * checks if it is a claim packet and if its on the same group. | |
999 | * This function also applies the group ID of the sender | |
1000 | * if it is in the same mesh. | |
1001 | * | |
62fe710f | 1002 | * Return: |
38ef3d1d SW |
1003 | * 2 - if it is a claim packet and on the same group |
1004 | * 1 - if is a claim packet from another group | |
1005 | * 0 - if it is not a claim packet | |
1006 | */ | |
56303d34 SE |
1007 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1008 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1009 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1010 | struct ethhdr *ethhdr) |
38ef3d1d | 1011 | { |
6b5e971a | 1012 | u8 *backbone_addr; |
56303d34 | 1013 | struct batadv_orig_node *orig_node; |
96412690 | 1014 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1015 | |
96412690 | 1016 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1017 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1018 | |
38ef3d1d SW |
1019 | /* if announcement packet, use the source, |
1020 | * otherwise assume it is in the hw_src | |
1021 | */ | |
1022 | switch (bla_dst->type) { | |
3eb8773e | 1023 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1024 | backbone_addr = hw_src; |
1025 | break; | |
acd34afa SE |
1026 | case BATADV_CLAIM_TYPE_REQUEST: |
1027 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1028 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1029 | backbone_addr = ethhdr->h_source; |
1030 | break; | |
1031 | default: | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1036 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1037 | return 0; |
1038 | ||
1039 | /* if its already the same group, it is fine. */ | |
1040 | if (bla_dst->group == bla_dst_own->group) | |
1041 | return 2; | |
1042 | ||
1043 | /* lets see if this originator is in our mesh */ | |
da641193 | 1044 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
1045 | |
1046 | /* dont accept claims from gateways which are not in | |
1047 | * the same mesh or group. | |
1048 | */ | |
1049 | if (!orig_node) | |
1050 | return 1; | |
1051 | ||
1052 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1053 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1054 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1055 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1056 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1057 | bla_dst_own->group = bla_dst->group; |
1058 | } | |
1059 | ||
5d967310 | 1060 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1061 | |
1062 | return 2; | |
1063 | } | |
1064 | ||
1b371d13 | 1065 | /** |
04e14be6 | 1066 | * batadv_bla_process_claim - Check if this is a claim frame, and process it |
1b371d13 | 1067 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1068 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1069 | * @skb: the frame to be checked |
1070 | * | |
4b426b10 | 1071 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1072 | * tell the callee that it can use the frame on its own. |
1073 | */ | |
4b426b10 SE |
1074 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1075 | struct batadv_hard_iface *primary_if, | |
1076 | struct sk_buff *skb) | |
23721387 | 1077 | { |
d46b6bfa | 1078 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1079 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1080 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1081 | struct ethhdr *ethhdr; |
23721387 | 1082 | struct arphdr *arphdr; |
c018ad3d | 1083 | unsigned short vid; |
d46b6bfa | 1084 | int vlan_depth = 0; |
293e9338 | 1085 | __be16 proto; |
23721387 | 1086 | int headlen; |
38ef3d1d | 1087 | int ret; |
23721387 | 1088 | |
c018ad3d | 1089 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1090 | ethhdr = eth_hdr(skb); |
23721387 | 1091 | |
c018ad3d AQ |
1092 | proto = ethhdr->h_proto; |
1093 | headlen = ETH_HLEN; | |
1094 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1095 | /* Traverse the VLAN/Ethertypes. |
1096 | * | |
1097 | * At this point it is known that the first protocol is a VLAN | |
1098 | * header, so start checking at the encapsulated protocol. | |
1099 | * | |
1100 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1101 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1102 | */ | |
1103 | do { | |
1104 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1105 | &vhdr_buf); | |
1106 | if (!vhdr) | |
4b426b10 | 1107 | return false; |
d46b6bfa SW |
1108 | |
1109 | proto = vhdr->h_vlan_encapsulated_proto; | |
1110 | headlen += VLAN_HLEN; | |
1111 | vlan_depth++; | |
1112 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1113 | } |
1114 | ||
293e9338 | 1115 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1116 | return false; /* not a claim frame */ |
23721387 SW |
1117 | |
1118 | /* this must be a ARP frame. check if it is a claim. */ | |
1119 | ||
1120 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1121 | return false; |
23721387 SW |
1122 | |
1123 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1124 | ethhdr = eth_hdr(skb); |
6b5e971a | 1125 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1126 | |
1127 | /* Check whether the ARP frame carries a valid | |
1128 | * IP information | |
1129 | */ | |
23721387 | 1130 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1131 | return false; |
23721387 | 1132 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1133 | return false; |
23721387 | 1134 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1135 | return false; |
23721387 | 1136 | if (arphdr->ar_pln != 4) |
4b426b10 | 1137 | return false; |
23721387 | 1138 | |
6b5e971a | 1139 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1140 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1141 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1142 | bla_dst_own = &bat_priv->bla.claim_dest; |
1143 | ||
1144 | /* check if it is a claim frame in general */ | |
1145 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1146 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1147 | return false; |
d46b6bfa SW |
1148 | |
1149 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1150 | * drop that, as this is not supported by BLA but should also not be | |
1151 | * sent via the mesh. | |
1152 | */ | |
1153 | if (vlan_depth > 1) | |
4b426b10 | 1154 | return true; |
23721387 | 1155 | |
cd9c7bfb SW |
1156 | /* Let the loopdetect frames on the mesh in any case. */ |
1157 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1158 | return false; |
cd9c7bfb | 1159 | |
23721387 | 1160 | /* check if it is a claim frame. */ |
3b300de3 SE |
1161 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1162 | ethhdr); | |
38ef3d1d | 1163 | if (ret == 1) |
39c75a51 | 1164 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1165 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
1166 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
1167 | hw_dst); | |
38ef3d1d SW |
1168 | |
1169 | if (ret < 2) | |
4b426b10 | 1170 | return !!ret; |
23721387 SW |
1171 | |
1172 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1173 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1174 | |
1175 | /* check for the different types of claim frames ... */ | |
1176 | switch (bla_dst->type) { | |
3eb8773e | 1177 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1178 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1179 | ethhdr->h_source, vid)) | |
4b426b10 | 1180 | return true; |
23721387 | 1181 | break; |
3eb8773e | 1182 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1183 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1184 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1185 | return true; |
23721387 SW |
1186 | break; |
1187 | ||
acd34afa | 1188 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1189 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1190 | vid)) | |
4b426b10 | 1191 | return true; |
23721387 | 1192 | break; |
acd34afa | 1193 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1194 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1195 | vid)) | |
4b426b10 | 1196 | return true; |
23721387 SW |
1197 | break; |
1198 | } | |
1199 | ||
39c75a51 | 1200 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1201 | "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 | 1202 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
4b426b10 | 1203 | return true; |
23721387 SW |
1204 | } |
1205 | ||
04e14be6 SW |
1206 | /** |
1207 | * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or | |
1208 | * immediately | |
1209 | * @bat_priv: the bat priv with all the soft interface information | |
1210 | * @now: whether the whole hash shall be wiped now | |
1211 | * | |
1212 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1213 | * a time out, or clean all backbone gws if now is set. |
1214 | */ | |
56303d34 | 1215 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1216 | { |
bae98774 | 1217 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1218 | struct hlist_node *node_tmp; |
23721387 | 1219 | struct hlist_head *head; |
5bf74e9c | 1220 | struct batadv_hashtable *hash; |
23721387 SW |
1221 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1222 | int i; | |
1223 | ||
807736f6 | 1224 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1225 | if (!hash) |
1226 | return; | |
1227 | ||
1228 | for (i = 0; i < hash->size; i++) { | |
1229 | head = &hash->table[i]; | |
1230 | list_lock = &hash->list_locks[i]; | |
1231 | ||
1232 | spin_lock_bh(list_lock); | |
b67bfe0d | 1233 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1234 | head, hash_entry) { |
1235 | if (now) | |
1236 | goto purge_now; | |
1eda58bf | 1237 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1238 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1239 | continue; |
1240 | ||
39c75a51 | 1241 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1242 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1243 | backbone_gw->orig); | |
23721387 SW |
1244 | |
1245 | purge_now: | |
1246 | /* don't wait for the pending request anymore */ | |
1247 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1248 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1249 | |
3b300de3 | 1250 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1251 | |
b67bfe0d | 1252 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1253 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1254 | } |
1255 | spin_unlock_bh(list_lock); | |
1256 | } | |
1257 | } | |
1258 | ||
2c53040f | 1259 | /** |
04e14be6 | 1260 | * batadv_bla_purge_claims - Remove claims after a timeout or immediately |
2c53040f | 1261 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1262 | * @primary_if: the selected primary interface, may be NULL if now is set |
1263 | * @now: whether the whole hash shall be wiped now | |
1264 | * | |
1265 | * Check when we heard last time from our own claims, and remove them in case of | |
1266 | * a time out, or clean all claims if now is set | |
1267 | */ | |
56303d34 SE |
1268 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1269 | struct batadv_hard_iface *primary_if, | |
1270 | int now) | |
23721387 | 1271 | { |
3db0decf | 1272 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1273 | struct batadv_bla_claim *claim; |
23721387 | 1274 | struct hlist_head *head; |
5bf74e9c | 1275 | struct batadv_hashtable *hash; |
23721387 SW |
1276 | int i; |
1277 | ||
807736f6 | 1278 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1279 | if (!hash) |
1280 | return; | |
1281 | ||
1282 | for (i = 0; i < hash->size; i++) { | |
1283 | head = &hash->table[i]; | |
1284 | ||
1285 | rcu_read_lock(); | |
b67bfe0d | 1286 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1287 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1288 | if (now) |
1289 | goto purge_now; | |
3db0decf SE |
1290 | |
1291 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1292 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1293 | goto skip; |
1294 | ||
1eda58bf | 1295 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1296 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1297 | goto skip; |
23721387 | 1298 | |
39c75a51 | 1299 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1300 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1301 | claim->addr, claim->vid); | |
23721387 SW |
1302 | |
1303 | purge_now: | |
3b300de3 | 1304 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1305 | backbone_gw->orig, |
3b300de3 | 1306 | claim->addr, claim->vid); |
3db0decf SE |
1307 | skip: |
1308 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1309 | } |
1310 | rcu_read_unlock(); | |
1311 | } | |
1312 | } | |
1313 | ||
2c53040f | 1314 | /** |
04e14be6 SW |
1315 | * batadv_bla_update_orig_address - Update the backbone gateways when the own |
1316 | * originator address changes | |
2c53040f | 1317 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1318 | * @primary_if: the new selected primary_if |
1319 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1320 | */ |
56303d34 SE |
1321 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1322 | struct batadv_hard_iface *primary_if, | |
1323 | struct batadv_hard_iface *oldif) | |
23721387 | 1324 | { |
bae98774 | 1325 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1326 | struct hlist_head *head; |
5bf74e9c | 1327 | struct batadv_hashtable *hash; |
807736f6 | 1328 | __be16 group; |
23721387 SW |
1329 | int i; |
1330 | ||
38ef3d1d | 1331 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1332 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1333 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1334 | |
d5b4c93e SW |
1335 | /* purge everything when bridge loop avoidance is turned off */ |
1336 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1337 | oldif = NULL; | |
1338 | ||
23721387 | 1339 | if (!oldif) { |
3b300de3 SE |
1340 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1341 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1342 | return; |
1343 | } | |
1344 | ||
807736f6 | 1345 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1346 | if (!hash) |
1347 | return; | |
1348 | ||
1349 | for (i = 0; i < hash->size; i++) { | |
1350 | head = &hash->table[i]; | |
1351 | ||
1352 | rcu_read_lock(); | |
b67bfe0d | 1353 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1354 | /* own orig still holds the old value. */ |
1eda58bf SE |
1355 | if (!batadv_compare_eth(backbone_gw->orig, |
1356 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1357 | continue; |
1358 | ||
8fdd0153 AQ |
1359 | ether_addr_copy(backbone_gw->orig, |
1360 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1361 | /* send an announce frame so others will ask for our |
1362 | * claims and update their tables. | |
1363 | */ | |
3b300de3 | 1364 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1365 | } |
1366 | rcu_read_unlock(); | |
1367 | } | |
1368 | } | |
1369 | ||
cd9c7bfb SW |
1370 | /** |
1371 | * batadv_bla_send_loopdetect - send a loopdetect frame | |
1372 | * @bat_priv: the bat priv with all the soft interface information | |
1373 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1374 | * | |
1375 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1376 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1377 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1378 | * indicates that there is a loop. | |
1379 | */ | |
1380 | static void | |
1381 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1382 | struct batadv_bla_backbone_gw *backbone_gw) | |
1383 | { | |
1384 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1385 | backbone_gw->vid); | |
1386 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1387 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1388 | } | |
1389 | ||
d68081a2 SW |
1390 | /** |
1391 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1392 | * @net_dev: the soft interface net device | |
1393 | */ | |
1394 | void batadv_bla_status_update(struct net_device *net_dev) | |
1395 | { | |
1396 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1397 | struct batadv_hard_iface *primary_if; | |
1398 | ||
1399 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1400 | if (!primary_if) | |
1401 | return; | |
1402 | ||
1403 | /* this function already purges everything when bla is disabled, | |
1404 | * so just call that one. | |
1405 | */ | |
1406 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1407 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1408 | } |
1409 | ||
04e14be6 SW |
1410 | /** |
1411 | * batadv_bla_periodic_work - performs periodic bla work | |
1412 | * @work: kernel work struct | |
1413 | * | |
1414 | * periodic work to do: | |
23721387 SW |
1415 | * * purge structures when they are too old |
1416 | * * send announcements | |
1417 | */ | |
3b300de3 | 1418 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1419 | { |
bbb1f90e | 1420 | struct delayed_work *delayed_work; |
56303d34 | 1421 | struct batadv_priv *bat_priv; |
807736f6 | 1422 | struct batadv_priv_bla *priv_bla; |
23721387 | 1423 | struct hlist_head *head; |
bae98774 | 1424 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1425 | struct batadv_hashtable *hash; |
56303d34 | 1426 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1427 | bool send_loopdetect = false; |
23721387 SW |
1428 | int i; |
1429 | ||
4ba4bc0f | 1430 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1431 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1432 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1433 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1434 | if (!primary_if) |
1435 | goto out; | |
1436 | ||
3b300de3 SE |
1437 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1438 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1439 | |
1440 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1441 | goto out; | |
1442 | ||
cd9c7bfb SW |
1443 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1444 | /* set a new random mac address for the next bridge loop | |
1445 | * detection frames. Set the locally administered bit to avoid | |
1446 | * collisions with users mac addresses. | |
1447 | */ | |
1448 | random_ether_addr(bat_priv->bla.loopdetect_addr); | |
1449 | bat_priv->bla.loopdetect_addr[0] = 0xba; | |
1450 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1451 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1452 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1453 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1454 | ||
1455 | /* mark for sending loop detect on all VLANs */ | |
1456 | send_loopdetect = true; | |
1457 | } | |
1458 | ||
807736f6 | 1459 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1460 | if (!hash) |
1461 | goto out; | |
1462 | ||
1463 | for (i = 0; i < hash->size; i++) { | |
1464 | head = &hash->table[i]; | |
1465 | ||
1466 | rcu_read_lock(); | |
b67bfe0d | 1467 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1468 | if (!batadv_compare_eth(backbone_gw->orig, |
1469 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1470 | continue; |
1471 | ||
1472 | backbone_gw->lasttime = jiffies; | |
1473 | ||
3b300de3 | 1474 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1475 | if (send_loopdetect) |
1476 | batadv_bla_send_loopdetect(bat_priv, | |
1477 | backbone_gw); | |
d807f272 SW |
1478 | |
1479 | /* request_sent is only set after creation to avoid | |
1480 | * problems when we are not yet known as backbone gw | |
1481 | * in the backbone. | |
1482 | * | |
28709878 SW |
1483 | * We can reset this now after we waited some periods |
1484 | * to give bridge forward delays and bla group forming | |
1485 | * some grace time. | |
d807f272 SW |
1486 | */ |
1487 | ||
1488 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1489 | continue; | |
1490 | ||
28709878 SW |
1491 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1492 | continue; | |
1493 | ||
d807f272 SW |
1494 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1495 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1496 | } |
1497 | rcu_read_unlock(); | |
1498 | } | |
1499 | out: | |
1500 | if (primary_if) | |
82047ad7 | 1501 | batadv_hardif_put(primary_if); |
23721387 | 1502 | |
72414442 AQ |
1503 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1504 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1505 | } |
1506 | ||
5d52dad2 SE |
1507 | /* The hash for claim and backbone hash receive the same key because they |
1508 | * are getting initialized by hash_new with the same key. Reinitializing | |
1509 | * them with to different keys to allow nested locking without generating | |
1510 | * lockdep warnings | |
1511 | */ | |
3b300de3 SE |
1512 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1513 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1514 | |
04e14be6 SW |
1515 | /** |
1516 | * batadv_bla_init - initialize all bla structures | |
1517 | * @bat_priv: the bat priv with all the soft interface information | |
1518 | * | |
1519 | * Return: 0 on success, < 0 on error. | |
1520 | */ | |
56303d34 | 1521 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1522 | { |
fe2da6ff | 1523 | int i; |
6b5e971a | 1524 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1525 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1526 | u16 crc; |
807736f6 | 1527 | unsigned long entrytime; |
fe2da6ff | 1528 | |
7dac7b76 LL |
1529 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1530 | ||
39c75a51 | 1531 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1532 | |
38ef3d1d | 1533 | /* setting claim destination address */ |
807736f6 SE |
1534 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1535 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1536 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1537 | if (primary_if) { |
807736f6 SE |
1538 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1539 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1540 | batadv_hardif_put(primary_if); |
38ef3d1d | 1541 | } else { |
807736f6 | 1542 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1543 | } |
1544 | ||
fe2da6ff | 1545 | /* initialize the duplicate list */ |
807736f6 | 1546 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1547 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1548 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1549 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1550 | |
cd9c7bfb SW |
1551 | atomic_set(&bat_priv->bla.loopdetect_next, |
1552 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1553 | ||
807736f6 | 1554 | if (bat_priv->bla.claim_hash) |
5346c35e | 1555 | return 0; |
23721387 | 1556 | |
807736f6 SE |
1557 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1558 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1559 | |
807736f6 | 1560 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1561 | return -ENOMEM; |
23721387 | 1562 | |
807736f6 | 1563 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1564 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1565 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1566 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1567 | |
39c75a51 | 1568 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1569 | |
72414442 AQ |
1570 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1571 | ||
1572 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1573 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1574 | return 0; |
23721387 SW |
1575 | } |
1576 | ||
2c53040f | 1577 | /** |
04e14be6 | 1578 | * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. |
2c53040f | 1579 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1580 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1581 | * |
1582 | * check if it is on our broadcast list. Another gateway might | |
1583 | * have sent the same packet because it is connected to the same backbone, | |
1584 | * so we have to remove this duplicate. | |
1585 | * | |
1586 | * This is performed by checking the CRC, which will tell us | |
1587 | * with a good chance that it is the same packet. If it is furthermore | |
1588 | * sent by another host, drop it. We allow equal packets from | |
1589 | * the same host however as this might be intended. | |
04e14be6 | 1590 | * |
4b426b10 | 1591 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1592 | */ |
4b426b10 SE |
1593 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
1594 | struct sk_buff *skb) | |
fe2da6ff | 1595 | { |
4b426b10 | 1596 | int i, curr; |
004e86fc SW |
1597 | __be32 crc; |
1598 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1599 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1600 | bool ret = false; |
fe2da6ff | 1601 | |
004e86fc | 1602 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1603 | |
1604 | /* calculate the crc ... */ | |
004e86fc | 1605 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1606 | |
7dac7b76 LL |
1607 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1608 | ||
42d0b044 | 1609 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1610 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1611 | curr %= BATADV_DUPLIST_SIZE; | |
1612 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1613 | |
1614 | /* we can stop searching if the entry is too old ; | |
1615 | * later entries will be even older | |
1616 | */ | |
42d0b044 SE |
1617 | if (batadv_has_timed_out(entry->entrytime, |
1618 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1619 | break; |
1620 | ||
1621 | if (entry->crc != crc) | |
1622 | continue; | |
1623 | ||
1eda58bf | 1624 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1625 | continue; |
1626 | ||
1627 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1628 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1629 | */ |
4b426b10 | 1630 | ret = true; |
7dac7b76 | 1631 | goto out; |
fe2da6ff | 1632 | } |
7dac7b76 | 1633 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1634 | * and allow it, its the first occurrence. |
7dac7b76 | 1635 | */ |
807736f6 | 1636 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1637 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1638 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1639 | entry->crc = crc; |
1640 | entry->entrytime = jiffies; | |
8fdd0153 | 1641 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1642 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1643 | |
7dac7b76 LL |
1644 | out: |
1645 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1646 | ||
1647 | return ret; | |
fe2da6ff SW |
1648 | } |
1649 | ||
1b371d13 | 1650 | /** |
04e14be6 SW |
1651 | * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for |
1652 | * the VLAN identified by vid. | |
1b371d13 | 1653 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1654 | * @orig: originator mac address |
cfd4f757 | 1655 | * @vid: VLAN identifier |
20ff9d59 | 1656 | * |
62fe710f | 1657 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1658 | */ |
6b5e971a | 1659 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1660 | unsigned short vid) |
20ff9d59 | 1661 | { |
807736f6 | 1662 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1663 | struct hlist_head *head; |
bae98774 | 1664 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1665 | int i; |
1666 | ||
1667 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1668 | return false; |
20ff9d59 SW |
1669 | |
1670 | if (!hash) | |
cfd4f757 | 1671 | return false; |
20ff9d59 SW |
1672 | |
1673 | for (i = 0; i < hash->size; i++) { | |
1674 | head = &hash->table[i]; | |
1675 | ||
1676 | rcu_read_lock(); | |
b67bfe0d | 1677 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1678 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1679 | backbone_gw->vid == vid) { | |
20ff9d59 | 1680 | rcu_read_unlock(); |
cfd4f757 | 1681 | return true; |
20ff9d59 SW |
1682 | } |
1683 | } | |
1684 | rcu_read_unlock(); | |
1685 | } | |
1686 | ||
cfd4f757 | 1687 | return false; |
20ff9d59 SW |
1688 | } |
1689 | ||
2c53040f | 1690 | /** |
04e14be6 | 1691 | * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. |
2c53040f | 1692 | * @skb: the frame to be checked |
23721387 SW |
1693 | * @orig_node: the orig_node of the frame |
1694 | * @hdr_size: maximum length of the frame | |
1695 | * | |
4b426b10 SE |
1696 | * Return: true if the orig_node is also a gateway on the soft interface, |
1697 | * otherwise it returns false. | |
23721387 | 1698 | */ |
4b426b10 SE |
1699 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1700 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1701 | { |
bae98774 | 1702 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1703 | unsigned short vid; |
23721387 SW |
1704 | |
1705 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1706 | return false; |
23721387 SW |
1707 | |
1708 | /* first, find out the vid. */ | |
0d125074 | 1709 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1710 | return false; |
23721387 | 1711 | |
c018ad3d | 1712 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1713 | |
1714 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1715 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1716 | orig_node->orig, vid); | |
23721387 | 1717 | if (!backbone_gw) |
4b426b10 | 1718 | return false; |
23721387 | 1719 | |
c8b86c12 | 1720 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1721 | return true; |
23721387 SW |
1722 | } |
1723 | ||
04e14be6 | 1724 | /** |
6d030de8 | 1725 | * batadv_bla_free - free all bla structures |
04e14be6 SW |
1726 | * @bat_priv: the bat priv with all the soft interface information |
1727 | * | |
1728 | * for softinterface free or module unload | |
1729 | */ | |
56303d34 | 1730 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1731 | { |
56303d34 | 1732 | struct batadv_hard_iface *primary_if; |
23721387 | 1733 | |
807736f6 | 1734 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1735 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1736 | |
807736f6 | 1737 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1738 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1739 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1740 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1741 | } |
807736f6 | 1742 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1743 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1744 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1745 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1746 | } |
1747 | if (primary_if) | |
82047ad7 | 1748 | batadv_hardif_put(primary_if); |
23721387 SW |
1749 | } |
1750 | ||
cd9c7bfb SW |
1751 | /** |
1752 | * batadv_bla_loopdetect_check - check and handle a detected loop | |
1753 | * @bat_priv: the bat priv with all the soft interface information | |
1754 | * @skb: the packet to check | |
1755 | * @primary_if: interface where the request came on | |
1756 | * @vid: the VLAN ID of the frame | |
1757 | * | |
1758 | * Checks if this packet is a loop detect frame which has been sent by us, | |
1759 | * throw an uevent and log the event if that is the case. | |
1760 | * | |
1761 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1762 | * otherwise. | |
1763 | */ | |
1764 | static bool | |
1765 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1766 | struct batadv_hard_iface *primary_if, | |
1767 | unsigned short vid) | |
1768 | { | |
1769 | struct batadv_bla_backbone_gw *backbone_gw; | |
1770 | struct ethhdr *ethhdr; | |
1771 | ||
1772 | ethhdr = eth_hdr(skb); | |
1773 | ||
1774 | /* Only check for the MAC address and skip more checks here for | |
1775 | * performance reasons - this function is on the hotpath, after all. | |
1776 | */ | |
1777 | if (!batadv_compare_eth(ethhdr->h_source, | |
1778 | bat_priv->bla.loopdetect_addr)) | |
1779 | return false; | |
1780 | ||
1781 | /* If the packet came too late, don't forward it on the mesh | |
1782 | * but don't consider that as loop. It might be a coincidence. | |
1783 | */ | |
1784 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1785 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1786 | return true; | |
1787 | ||
1788 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1789 | primary_if->net_dev->dev_addr, | |
1790 | vid, true); | |
1791 | if (unlikely(!backbone_gw)) | |
1792 | return true; | |
1793 | ||
1794 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); | |
1795 | /* backbone_gw is unreferenced in the report work function function */ | |
1796 | ||
1797 | return true; | |
1798 | } | |
1799 | ||
2c53040f | 1800 | /** |
04e14be6 | 1801 | * batadv_bla_rx - check packets coming from the mesh. |
2c53040f | 1802 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1803 | * @skb: the frame to be checked |
1804 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1805 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1806 | * |
04e14be6 | 1807 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1808 | * * we have to race for a claim |
1809 | * * if the frame is allowed on the LAN | |
1810 | * | |
62fe710f SE |
1811 | * in these cases, the skb is further handled by this function |
1812 | * | |
4b426b10 SE |
1813 | * Return: true if handled, otherwise it returns false and the caller shall |
1814 | * further process the skb. | |
23721387 | 1815 | */ |
4b426b10 SE |
1816 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1817 | unsigned short vid, bool is_bcast) | |
23721387 | 1818 | { |
3db0decf | 1819 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1820 | struct ethhdr *ethhdr; |
712bbfe4 | 1821 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1822 | struct batadv_hard_iface *primary_if; |
3db0decf | 1823 | bool own_claim; |
4b426b10 | 1824 | bool ret; |
23721387 | 1825 | |
7ed4be95 | 1826 | ethhdr = eth_hdr(skb); |
23721387 | 1827 | |
e5d89254 | 1828 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1829 | if (!primary_if) |
1830 | goto handled; | |
1831 | ||
1832 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1833 | goto allow; | |
1834 | ||
cd9c7bfb SW |
1835 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1836 | goto handled; | |
1837 | ||
807736f6 | 1838 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1839 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1840 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1841 | goto handled; |
1842 | ||
8fdd0153 | 1843 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1844 | search_claim.vid = vid; |
3b300de3 | 1845 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1846 | |
1847 | if (!claim) { | |
1848 | /* possible optimization: race for a claim */ | |
1849 | /* No claim exists yet, claim it for us! | |
1850 | */ | |
3b300de3 SE |
1851 | batadv_handle_claim(bat_priv, primary_if, |
1852 | primary_if->net_dev->dev_addr, | |
1853 | ethhdr->h_source, vid); | |
23721387 SW |
1854 | goto allow; |
1855 | } | |
1856 | ||
1857 | /* if it is our own claim ... */ | |
3db0decf SE |
1858 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1859 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1860 | primary_if->net_dev->dev_addr); | |
1861 | batadv_backbone_gw_put(backbone_gw); | |
1862 | ||
1863 | if (own_claim) { | |
23721387 SW |
1864 | /* ... allow it in any case */ |
1865 | claim->lasttime = jiffies; | |
1866 | goto allow; | |
1867 | } | |
1868 | ||
1869 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1870 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1871 | /* ... drop it. the responsible gateway is in charge. | |
1872 | * | |
1873 | * We need to check is_bcast because with the gateway | |
1874 | * feature, broadcasts (like DHCP requests) may be sent | |
1875 | * using a unicast packet type. | |
1876 | */ | |
23721387 SW |
1877 | goto handled; |
1878 | } else { | |
1879 | /* seems the client considers us as its best gateway. | |
1880 | * send a claim and update the claim table | |
1881 | * immediately. | |
1882 | */ | |
3b300de3 SE |
1883 | batadv_handle_claim(bat_priv, primary_if, |
1884 | primary_if->net_dev->dev_addr, | |
1885 | ethhdr->h_source, vid); | |
23721387 SW |
1886 | goto allow; |
1887 | } | |
1888 | allow: | |
3b300de3 | 1889 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1890 | ret = false; |
23721387 SW |
1891 | goto out; |
1892 | ||
1893 | handled: | |
1894 | kfree_skb(skb); | |
4b426b10 | 1895 | ret = true; |
23721387 SW |
1896 | |
1897 | out: | |
1898 | if (primary_if) | |
82047ad7 | 1899 | batadv_hardif_put(primary_if); |
23721387 | 1900 | if (claim) |
321e3e08 | 1901 | batadv_claim_put(claim); |
23721387 SW |
1902 | return ret; |
1903 | } | |
1904 | ||
2c53040f | 1905 | /** |
04e14be6 | 1906 | * batadv_bla_tx - check packets going into the mesh |
2c53040f | 1907 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1908 | * @skb: the frame to be checked |
1909 | * @vid: the VLAN ID of the frame | |
1910 | * | |
04e14be6 | 1911 | * batadv_bla_tx checks if: |
23721387 SW |
1912 | * * a claim was received which has to be processed |
1913 | * * the frame is allowed on the mesh | |
1914 | * | |
62fe710f | 1915 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1916 | * |
1917 | * This call might reallocate skb data. | |
62fe710f | 1918 | * |
4b426b10 SE |
1919 | * Return: true if handled, otherwise it returns false and the caller shall |
1920 | * further process the skb. | |
23721387 | 1921 | */ |
4b426b10 SE |
1922 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1923 | unsigned short vid) | |
23721387 SW |
1924 | { |
1925 | struct ethhdr *ethhdr; | |
712bbfe4 | 1926 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 1927 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 1928 | struct batadv_hard_iface *primary_if; |
3db0decf | 1929 | bool client_roamed; |
4b426b10 | 1930 | bool ret = false; |
23721387 | 1931 | |
e5d89254 | 1932 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1933 | if (!primary_if) |
1934 | goto out; | |
1935 | ||
1936 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1937 | goto allow; | |
1938 | ||
3b300de3 | 1939 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1940 | goto handled; |
1941 | ||
7ed4be95 | 1942 | ethhdr = eth_hdr(skb); |
23721387 | 1943 | |
807736f6 | 1944 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1945 | /* don't allow broadcasts while requests are in flight */ |
1946 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1947 | goto handled; | |
1948 | ||
8fdd0153 | 1949 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1950 | search_claim.vid = vid; |
1951 | ||
3b300de3 | 1952 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1953 | |
1954 | /* if no claim exists, allow it. */ | |
1955 | if (!claim) | |
1956 | goto allow; | |
1957 | ||
1958 | /* check if we are responsible. */ | |
3db0decf SE |
1959 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1960 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
1961 | primary_if->net_dev->dev_addr); | |
1962 | batadv_backbone_gw_put(backbone_gw); | |
1963 | ||
1964 | if (client_roamed) { | |
23721387 SW |
1965 | /* if yes, the client has roamed and we have |
1966 | * to unclaim it. | |
1967 | */ | |
3b300de3 SE |
1968 | batadv_handle_unclaim(bat_priv, primary_if, |
1969 | primary_if->net_dev->dev_addr, | |
1970 | ethhdr->h_source, vid); | |
23721387 SW |
1971 | goto allow; |
1972 | } | |
1973 | ||
1974 | /* check if it is a multicast/broadcast frame */ | |
1975 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1976 | /* drop it. the responsible gateway has forwarded it into | |
1977 | * the backbone network. | |
1978 | */ | |
1979 | goto handled; | |
1980 | } else { | |
1981 | /* we must allow it. at least if we are | |
1982 | * responsible for the DESTINATION. | |
1983 | */ | |
1984 | goto allow; | |
1985 | } | |
1986 | allow: | |
3b300de3 | 1987 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1988 | ret = false; |
23721387 SW |
1989 | goto out; |
1990 | handled: | |
4b426b10 | 1991 | ret = true; |
23721387 SW |
1992 | out: |
1993 | if (primary_if) | |
82047ad7 | 1994 | batadv_hardif_put(primary_if); |
23721387 | 1995 | if (claim) |
321e3e08 | 1996 | batadv_claim_put(claim); |
23721387 SW |
1997 | return ret; |
1998 | } | |
9bf8e4d4 | 1999 | |
04e14be6 SW |
2000 | /** |
2001 | * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file | |
2002 | * @seq: seq file to print on | |
2003 | * @offset: not used | |
2004 | * | |
2005 | * Return: always 0 | |
2006 | */ | |
08adf151 | 2007 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
2008 | { |
2009 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 2010 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 2011 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
3db0decf | 2012 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 2013 | struct batadv_bla_claim *claim; |
56303d34 | 2014 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 2015 | struct hlist_head *head; |
5a1dd8a4 | 2016 | u16 backbone_crc; |
6b5e971a | 2017 | u32 i; |
9bf8e4d4 | 2018 | bool is_own; |
6b5e971a | 2019 | u8 *primary_addr; |
9bf8e4d4 | 2020 | |
30da63a6 ML |
2021 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2022 | if (!primary_if) | |
9bf8e4d4 | 2023 | goto out; |
9bf8e4d4 | 2024 | |
1eda58bf | 2025 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 2026 | seq_printf(seq, |
39a32991 | 2027 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 2028 | net_dev->name, primary_addr, |
807736f6 | 2029 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 AQ |
2030 | seq_puts(seq, |
2031 | " Client VID Originator [o] (CRC )\n"); | |
9bf8e4d4 SW |
2032 | for (i = 0; i < hash->size; i++) { |
2033 | head = &hash->table[i]; | |
2034 | ||
2035 | rcu_read_lock(); | |
b67bfe0d | 2036 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf SE |
2037 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2038 | ||
2039 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 2040 | primary_addr); |
5a1dd8a4 | 2041 | |
3db0decf SE |
2042 | spin_lock_bh(&backbone_gw->crc_lock); |
2043 | backbone_crc = backbone_gw->crc; | |
2044 | spin_unlock_bh(&backbone_gw->crc_lock); | |
eb2deb6b | 2045 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 2046 | claim->addr, BATADV_PRINT_VID(claim->vid), |
3db0decf | 2047 | backbone_gw->orig, |
9bf8e4d4 | 2048 | (is_own ? 'x' : ' '), |
5a1dd8a4 | 2049 | backbone_crc); |
3db0decf SE |
2050 | |
2051 | batadv_backbone_gw_put(backbone_gw); | |
9bf8e4d4 SW |
2052 | } |
2053 | rcu_read_unlock(); | |
2054 | } | |
2055 | out: | |
2056 | if (primary_if) | |
82047ad7 | 2057 | batadv_hardif_put(primary_if); |
30da63a6 | 2058 | return 0; |
9bf8e4d4 | 2059 | } |
536a23f1 | 2060 | |
04f3f5bf AL |
2061 | /** |
2062 | * batadv_bla_claim_dump_entry - dump one entry of the claim table | |
2063 | * to a netlink socket | |
2064 | * @msg: buffer for the message | |
2065 | * @portid: netlink port | |
2066 | * @seq: Sequence number of netlink message | |
2067 | * @primary_if: primary interface | |
2068 | * @claim: entry to dump | |
2069 | * | |
2070 | * Return: 0 or error code. | |
2071 | */ | |
2072 | static int | |
2073 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2074 | struct batadv_hard_iface *primary_if, | |
2075 | struct batadv_bla_claim *claim) | |
2076 | { | |
2077 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2078 | u16 backbone_crc; | |
2079 | bool is_own; | |
2080 | void *hdr; | |
2081 | int ret = -EINVAL; | |
2082 | ||
2083 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2084 | NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM); | |
2085 | if (!hdr) { | |
2086 | ret = -ENOBUFS; | |
2087 | goto out; | |
2088 | } | |
2089 | ||
2090 | is_own = batadv_compare_eth(claim->backbone_gw->orig, | |
2091 | primary_addr); | |
2092 | ||
2093 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
2094 | backbone_crc = claim->backbone_gw->crc; | |
2095 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
2096 | ||
2097 | if (is_own) | |
2098 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2099 | genlmsg_cancel(msg, hdr); | |
2100 | goto out; | |
2101 | } | |
2102 | ||
2103 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || | |
2104 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || | |
2105 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2106 | claim->backbone_gw->orig) || | |
2107 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2108 | backbone_crc)) { | |
2109 | genlmsg_cancel(msg, hdr); | |
2110 | goto out; | |
2111 | } | |
2112 | ||
2113 | genlmsg_end(msg, hdr); | |
2114 | ret = 0; | |
2115 | ||
2116 | out: | |
2117 | return ret; | |
2118 | } | |
2119 | ||
2120 | /** | |
2121 | * batadv_bla_claim_dump_bucket - dump one bucket of the claim table | |
2122 | * to a netlink socket | |
2123 | * @msg: buffer for the message | |
2124 | * @portid: netlink port | |
2125 | * @seq: Sequence number of netlink message | |
2126 | * @primary_if: primary interface | |
2127 | * @head: bucket to dump | |
2128 | * @idx_skip: How many entries to skip | |
2129 | * | |
2130 | * Return: always 0. | |
2131 | */ | |
2132 | static int | |
2133 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2134 | struct batadv_hard_iface *primary_if, | |
2135 | struct hlist_head *head, int *idx_skip) | |
2136 | { | |
2137 | struct batadv_bla_claim *claim; | |
2138 | int idx = 0; | |
2139 | ||
2140 | rcu_read_lock(); | |
2141 | hlist_for_each_entry_rcu(claim, head, hash_entry) { | |
2142 | if (idx++ < *idx_skip) | |
2143 | continue; | |
2144 | if (batadv_bla_claim_dump_entry(msg, portid, seq, | |
2145 | primary_if, claim)) { | |
2146 | *idx_skip = idx - 1; | |
2147 | goto unlock; | |
2148 | } | |
2149 | } | |
2150 | ||
2151 | *idx_skip = idx; | |
2152 | unlock: | |
2153 | rcu_read_unlock(); | |
2154 | return 0; | |
2155 | } | |
2156 | ||
2157 | /** | |
2158 | * batadv_bla_claim_dump - dump claim table to a netlink socket | |
2159 | * @msg: buffer for the message | |
2160 | * @cb: callback structure containing arguments | |
2161 | * | |
2162 | * Return: message length. | |
2163 | */ | |
2164 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2165 | { | |
2166 | struct batadv_hard_iface *primary_if = NULL; | |
2167 | int portid = NETLINK_CB(cb->skb).portid; | |
2168 | struct net *net = sock_net(cb->skb->sk); | |
2169 | struct net_device *soft_iface; | |
2170 | struct batadv_hashtable *hash; | |
2171 | struct batadv_priv *bat_priv; | |
2172 | int bucket = cb->args[0]; | |
2173 | struct hlist_head *head; | |
2174 | int idx = cb->args[1]; | |
2175 | int ifindex; | |
2176 | int ret = 0; | |
2177 | ||
2178 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2179 | BATADV_ATTR_MESH_IFINDEX); | |
2180 | if (!ifindex) | |
2181 | return -EINVAL; | |
2182 | ||
2183 | soft_iface = dev_get_by_index(net, ifindex); | |
2184 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2185 | ret = -ENODEV; | |
2186 | goto out; | |
2187 | } | |
2188 | ||
2189 | bat_priv = netdev_priv(soft_iface); | |
2190 | hash = bat_priv->bla.claim_hash; | |
2191 | ||
2192 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2193 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2194 | ret = -ENOENT; | |
2195 | goto out; | |
2196 | } | |
2197 | ||
2198 | while (bucket < hash->size) { | |
2199 | head = &hash->table[bucket]; | |
2200 | ||
2201 | if (batadv_bla_claim_dump_bucket(msg, portid, | |
2202 | cb->nlh->nlmsg_seq, | |
2203 | primary_if, head, &idx)) | |
2204 | break; | |
2205 | bucket++; | |
2206 | } | |
2207 | ||
2208 | cb->args[0] = bucket; | |
2209 | cb->args[1] = idx; | |
2210 | ||
2211 | ret = msg->len; | |
2212 | ||
2213 | out: | |
2214 | if (primary_if) | |
2215 | batadv_hardif_put(primary_if); | |
2216 | ||
2217 | if (soft_iface) | |
2218 | dev_put(soft_iface); | |
2219 | ||
2220 | return ret; | |
2221 | } | |
2222 | ||
04e14be6 SW |
2223 | /** |
2224 | * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq | |
2225 | * file | |
2226 | * @seq: seq file to print on | |
2227 | * @offset: not used | |
2228 | * | |
2229 | * Return: always 0 | |
2230 | */ | |
536a23f1 SW |
2231 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
2232 | { | |
2233 | struct net_device *net_dev = (struct net_device *)seq->private; | |
2234 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 2235 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 2236 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 2237 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
2238 | struct hlist_head *head; |
2239 | int secs, msecs; | |
5a1dd8a4 | 2240 | u16 backbone_crc; |
6b5e971a | 2241 | u32 i; |
536a23f1 | 2242 | bool is_own; |
6b5e971a | 2243 | u8 *primary_addr; |
536a23f1 | 2244 | |
30da63a6 ML |
2245 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2246 | if (!primary_if) | |
536a23f1 | 2247 | goto out; |
536a23f1 SW |
2248 | |
2249 | primary_addr = primary_if->net_dev->dev_addr; | |
2250 | seq_printf(seq, | |
39a32991 | 2251 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 2252 | net_dev->name, primary_addr, |
807736f6 | 2253 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 | 2254 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
536a23f1 SW |
2255 | for (i = 0; i < hash->size; i++) { |
2256 | head = &hash->table[i]; | |
2257 | ||
2258 | rcu_read_lock(); | |
b67bfe0d | 2259 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
2260 | msecs = jiffies_to_msecs(jiffies - |
2261 | backbone_gw->lasttime); | |
2262 | secs = msecs / 1000; | |
2263 | msecs = msecs % 1000; | |
2264 | ||
2265 | is_own = batadv_compare_eth(backbone_gw->orig, | |
2266 | primary_addr); | |
2267 | if (is_own) | |
2268 | continue; | |
2269 | ||
5a1dd8a4 SW |
2270 | spin_lock_bh(&backbone_gw->crc_lock); |
2271 | backbone_crc = backbone_gw->crc; | |
2272 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2273 | ||
eb2deb6b | 2274 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
2275 | backbone_gw->orig, |
2276 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 2277 | msecs, backbone_crc); |
536a23f1 SW |
2278 | } |
2279 | rcu_read_unlock(); | |
2280 | } | |
2281 | out: | |
2282 | if (primary_if) | |
82047ad7 | 2283 | batadv_hardif_put(primary_if); |
30da63a6 | 2284 | return 0; |
536a23f1 | 2285 | } |