Commit | Line | Data |
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ac79cbb9 | 1 | /* Copyright (C) 2011-2017 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 | |
453 | netif_rx(skb); | |
454 | out: | |
455 | if (primary_if) | |
82047ad7 | 456 | batadv_hardif_put(primary_if); |
23721387 SW |
457 | } |
458 | ||
cd9c7bfb SW |
459 | /** |
460 | * batadv_bla_loopdetect_report - worker for reporting the loop | |
461 | * @work: work queue item | |
462 | * | |
463 | * Throws an uevent, as the loopdetect check function can't do that itself | |
464 | * since the kernel may sleep while throwing uevents. | |
465 | */ | |
466 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
467 | { | |
468 | struct batadv_bla_backbone_gw *backbone_gw; | |
469 | struct batadv_priv *bat_priv; | |
470 | char vid_str[6] = { '\0' }; | |
471 | ||
472 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
473 | report_work); | |
474 | bat_priv = backbone_gw->bat_priv; | |
475 | ||
476 | batadv_info(bat_priv->soft_iface, | |
477 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
478 | BATADV_PRINT_VID(backbone_gw->vid)); | |
479 | snprintf(vid_str, sizeof(vid_str), "%d", | |
480 | BATADV_PRINT_VID(backbone_gw->vid)); | |
481 | vid_str[sizeof(vid_str) - 1] = 0; | |
482 | ||
483 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
484 | vid_str); | |
485 | ||
486 | batadv_backbone_gw_put(backbone_gw); | |
487 | } | |
488 | ||
2c53040f | 489 | /** |
04e14be6 | 490 | * batadv_bla_get_backbone_gw - finds or creates a backbone gateway |
2c53040f | 491 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
492 | * @orig: the mac address of the originator |
493 | * @vid: the VLAN ID | |
e3357189 | 494 | * @own_backbone: set if the requested backbone is local |
23721387 | 495 | * |
04e14be6 | 496 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 497 | */ |
bae98774 | 498 | static struct batadv_bla_backbone_gw * |
6b5e971a | 499 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 500 | unsigned short vid, bool own_backbone) |
23721387 | 501 | { |
bae98774 | 502 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 503 | struct batadv_orig_node *orig_node; |
23721387 SW |
504 | int hash_added; |
505 | ||
3b300de3 | 506 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
507 | |
508 | if (entry) | |
509 | return entry; | |
510 | ||
39c75a51 | 511 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 512 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 513 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
514 | |
515 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
516 | if (!entry) | |
517 | return NULL; | |
518 | ||
519 | entry->vid = vid; | |
520 | entry->lasttime = jiffies; | |
3964f728 | 521 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 522 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 523 | spin_lock_init(&entry->crc_lock); |
23721387 | 524 | atomic_set(&entry->request_sent, 0); |
28709878 | 525 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 526 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 527 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
06e56ded | 528 | kref_init(&entry->refcount); |
23721387 | 529 | |
4e8389e1 | 530 | kref_get(&entry->refcount); |
807736f6 | 531 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
532 | batadv_compare_backbone_gw, |
533 | batadv_choose_backbone_gw, entry, | |
534 | &entry->hash_entry); | |
23721387 SW |
535 | |
536 | if (unlikely(hash_added != 0)) { | |
537 | /* hash failed, free the structure */ | |
538 | kfree(entry); | |
539 | return NULL; | |
540 | } | |
541 | ||
95fb130d | 542 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 543 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 544 | if (orig_node) { |
95fb130d | 545 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 546 | "became a backbone gateway"); |
5d967310 | 547 | batadv_orig_node_put(orig_node); |
20ff9d59 | 548 | } |
52aebd6a | 549 | |
d807f272 | 550 | if (own_backbone) { |
52aebd6a SW |
551 | batadv_bla_send_announce(bat_priv, entry); |
552 | ||
d807f272 SW |
553 | /* this will be decreased in the worker thread */ |
554 | atomic_inc(&entry->request_sent); | |
28709878 | 555 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
556 | atomic_inc(&bat_priv->bla.num_requests); |
557 | } | |
558 | ||
23721387 SW |
559 | return entry; |
560 | } | |
561 | ||
04e14be6 SW |
562 | /** |
563 | * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN | |
564 | * @bat_priv: the bat priv with all the soft interface information | |
565 | * @primary_if: the selected primary interface | |
566 | * @vid: VLAN identifier | |
567 | * | |
568 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
569 | * where we receive other backbone gws |
570 | */ | |
56303d34 SE |
571 | static void |
572 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
573 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 574 | unsigned short vid) |
23721387 | 575 | { |
bae98774 | 576 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 577 | |
3b300de3 SE |
578 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
579 | primary_if->net_dev->dev_addr, | |
52aebd6a | 580 | vid, true); |
23721387 SW |
581 | if (unlikely(!backbone_gw)) |
582 | return; | |
583 | ||
584 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 585 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
586 | } |
587 | ||
1b371d13 SW |
588 | /** |
589 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
590 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 591 | * @primary_if: interface where the request came on |
23721387 SW |
592 | * @vid: the vid where the request came on |
593 | * | |
594 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
595 | * to allow the requester another check if the CRC is correct now. | |
596 | */ | |
56303d34 SE |
597 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
598 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 599 | unsigned short vid) |
23721387 | 600 | { |
23721387 | 601 | struct hlist_head *head; |
5bf74e9c | 602 | struct batadv_hashtable *hash; |
712bbfe4 | 603 | struct batadv_bla_claim *claim; |
bae98774 | 604 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
605 | int i; |
606 | ||
39c75a51 | 607 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 608 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 609 | |
3b300de3 SE |
610 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
611 | primary_if->net_dev->dev_addr, | |
612 | vid); | |
23721387 SW |
613 | if (!backbone_gw) |
614 | return; | |
615 | ||
807736f6 | 616 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
617 | for (i = 0; i < hash->size; i++) { |
618 | head = &hash->table[i]; | |
619 | ||
620 | rcu_read_lock(); | |
b67bfe0d | 621 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
622 | /* only own claims are interesting */ |
623 | if (claim->backbone_gw != backbone_gw) | |
624 | continue; | |
625 | ||
3b300de3 | 626 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 627 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
628 | } |
629 | rcu_read_unlock(); | |
630 | } | |
631 | ||
632 | /* finally, send an announcement frame */ | |
3b300de3 | 633 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 634 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
635 | } |
636 | ||
1b371d13 SW |
637 | /** |
638 | * batadv_bla_send_request - send a request to repeat claims | |
639 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
640 | * |
641 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
642 | * After the request, it will repeat all of his own claims and finally | |
643 | * send an announcement claim with which we can check again. | |
644 | */ | |
bae98774 | 645 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
646 | { |
647 | /* first, remove all old entries */ | |
3b300de3 | 648 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 649 | |
39c75a51 SE |
650 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
651 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
652 | |
653 | /* send request */ | |
3b300de3 | 654 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 655 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
656 | |
657 | /* no local broadcasts should be sent or received, for now. */ | |
658 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 659 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
660 | atomic_set(&backbone_gw->request_sent, 1); |
661 | } | |
662 | } | |
663 | ||
1b371d13 | 664 | /** |
04e14be6 | 665 | * batadv_bla_send_announce - Send an announcement frame |
1b371d13 | 666 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 667 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 668 | */ |
56303d34 | 669 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 670 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 671 | { |
6b5e971a | 672 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 673 | __be16 crc; |
23721387 | 674 | |
3b300de3 | 675 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 676 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 677 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 678 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 679 | memcpy(&mac[4], &crc, 2); |
23721387 | 680 | |
3b300de3 | 681 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 682 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
683 | } |
684 | ||
2c53040f BH |
685 | /** |
686 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
687 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
688 | * @mac: the mac address of the claim |
689 | * @vid: the VLAN ID of the frame | |
690 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 691 | */ |
56303d34 | 692 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 693 | const u8 *mac, const unsigned short vid, |
bae98774 | 694 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 695 | { |
3db0decf | 696 | struct batadv_bla_backbone_gw *old_backbone_gw; |
712bbfe4 ML |
697 | struct batadv_bla_claim *claim; |
698 | struct batadv_bla_claim search_claim; | |
3db0decf | 699 | bool remove_crc = false; |
23721387 SW |
700 | int hash_added; |
701 | ||
8fdd0153 | 702 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 703 | search_claim.vid = vid; |
3b300de3 | 704 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
705 | |
706 | /* create a new claim entry if it does not exist yet. */ | |
707 | if (!claim) { | |
708 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
709 | if (!claim) | |
710 | return; | |
711 | ||
8fdd0153 | 712 | ether_addr_copy(claim->addr, mac); |
3db0decf | 713 | spin_lock_init(&claim->backbone_lock); |
23721387 SW |
714 | claim->vid = vid; |
715 | claim->lasttime = jiffies; | |
3db0decf | 716 | kref_get(&backbone_gw->refcount); |
23721387 | 717 | claim->backbone_gw = backbone_gw; |
71b7e3d3 | 718 | kref_init(&claim->refcount); |
7282ac39 | 719 | |
39c75a51 | 720 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 721 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 722 | mac, BATADV_PRINT_VID(vid)); |
7282ac39 SE |
723 | |
724 | kref_get(&claim->refcount); | |
807736f6 | 725 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
726 | batadv_compare_claim, |
727 | batadv_choose_claim, claim, | |
728 | &claim->hash_entry); | |
23721387 SW |
729 | |
730 | if (unlikely(hash_added != 0)) { | |
731 | /* only local changes happened. */ | |
732 | kfree(claim); | |
733 | return; | |
734 | } | |
735 | } else { | |
736 | claim->lasttime = jiffies; | |
737 | if (claim->backbone_gw == backbone_gw) | |
738 | /* no need to register a new backbone */ | |
739 | goto claim_free_ref; | |
740 | ||
39c75a51 | 741 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 742 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 743 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 744 | |
3db0decf | 745 | remove_crc = true; |
23721387 | 746 | } |
3db0decf SE |
747 | |
748 | /* replace backbone_gw atomically and adjust reference counters */ | |
749 | spin_lock_bh(&claim->backbone_lock); | |
750 | old_backbone_gw = claim->backbone_gw; | |
06e56ded | 751 | kref_get(&backbone_gw->refcount); |
23721387 | 752 | claim->backbone_gw = backbone_gw; |
3db0decf | 753 | spin_unlock_bh(&claim->backbone_lock); |
23721387 | 754 | |
3db0decf SE |
755 | if (remove_crc) { |
756 | /* remove claim address from old backbone_gw */ | |
757 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
758 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
759 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
760 | } | |
23721387 | 761 | |
3db0decf SE |
762 | batadv_backbone_gw_put(old_backbone_gw); |
763 | ||
764 | /* add claim address to new backbone_gw */ | |
5a1dd8a4 | 765 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 766 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 767 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
768 | backbone_gw->lasttime = jiffies; |
769 | ||
770 | claim_free_ref: | |
321e3e08 | 771 | batadv_claim_put(claim); |
23721387 SW |
772 | } |
773 | ||
3db0decf SE |
774 | /** |
775 | * batadv_bla_claim_get_backbone_gw - Get valid reference for backbone_gw of | |
776 | * claim | |
777 | * @claim: claim whose backbone_gw should be returned | |
778 | * | |
779 | * Return: valid reference to claim::backbone_gw | |
780 | */ | |
781 | static struct batadv_bla_backbone_gw * | |
782 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) | |
783 | { | |
784 | struct batadv_bla_backbone_gw *backbone_gw; | |
785 | ||
786 | spin_lock_bh(&claim->backbone_lock); | |
787 | backbone_gw = claim->backbone_gw; | |
788 | kref_get(&backbone_gw->refcount); | |
789 | spin_unlock_bh(&claim->backbone_lock); | |
790 | ||
791 | return backbone_gw; | |
792 | } | |
793 | ||
04e14be6 SW |
794 | /** |
795 | * batadv_bla_del_claim - delete a claim from the claim hash | |
796 | * @bat_priv: the bat priv with all the soft interface information | |
797 | * @mac: mac address of the claim to be removed | |
798 | * @vid: VLAN id for the claim to be removed | |
23721387 | 799 | */ |
56303d34 | 800 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 801 | const u8 *mac, const unsigned short vid) |
23721387 | 802 | { |
712bbfe4 | 803 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 804 | |
8fdd0153 | 805 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 806 | search_claim.vid = vid; |
3b300de3 | 807 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
808 | if (!claim) |
809 | return; | |
810 | ||
39c75a51 | 811 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 812 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 813 | |
807736f6 | 814 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 | 815 | batadv_choose_claim, claim); |
321e3e08 | 816 | batadv_claim_put(claim); /* reference from the hash is gone */ |
23721387 | 817 | |
23721387 | 818 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 819 | batadv_claim_put(claim); |
23721387 SW |
820 | } |
821 | ||
62fe710f SE |
822 | /** |
823 | * batadv_handle_announce - check for ANNOUNCE frame | |
04e14be6 SW |
824 | * @bat_priv: the bat priv with all the soft interface information |
825 | * @an_addr: announcement mac address (ARP Sender HW address) | |
826 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
827 | * @vid: the VLAN ID of the frame | |
62fe710f | 828 | * |
4b426b10 | 829 | * Return: true if handled |
62fe710f | 830 | */ |
4b426b10 SE |
831 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
832 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 833 | { |
bae98774 | 834 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 835 | u16 backbone_crc, crc; |
23721387 | 836 | |
3b300de3 | 837 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 838 | return false; |
23721387 | 839 | |
52aebd6a SW |
840 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
841 | false); | |
23721387 SW |
842 | |
843 | if (unlikely(!backbone_gw)) | |
4b426b10 | 844 | return true; |
23721387 | 845 | |
23721387 SW |
846 | /* handle as ANNOUNCE frame */ |
847 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 848 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 849 | |
39c75a51 | 850 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 851 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 852 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 853 | |
5a1dd8a4 SW |
854 | spin_lock_bh(&backbone_gw->crc_lock); |
855 | backbone_crc = backbone_gw->crc; | |
856 | spin_unlock_bh(&backbone_gw->crc_lock); | |
857 | ||
858 | if (backbone_crc != crc) { | |
39c75a51 | 859 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 860 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
861 | backbone_gw->orig, |
862 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 863 | backbone_crc, crc); |
23721387 | 864 | |
3b300de3 | 865 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
866 | } else { |
867 | /* if we have sent a request and the crc was OK, | |
868 | * we can allow traffic again. | |
869 | */ | |
870 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 871 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
872 | atomic_set(&backbone_gw->request_sent, 0); |
873 | } | |
874 | } | |
875 | ||
c8b86c12 | 876 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 877 | return true; |
23721387 SW |
878 | } |
879 | ||
62fe710f SE |
880 | /** |
881 | * batadv_handle_request - check for REQUEST frame | |
04e14be6 SW |
882 | * @bat_priv: the bat priv with all the soft interface information |
883 | * @primary_if: the primary hard interface of this batman soft interface | |
884 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
885 | * @ethhdr: ethernet header of a packet | |
886 | * @vid: the VLAN ID of the frame | |
62fe710f | 887 | * |
4b426b10 | 888 | * Return: true if handled |
62fe710f | 889 | */ |
4b426b10 SE |
890 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
891 | struct batadv_hard_iface *primary_if, | |
892 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
893 | unsigned short vid) | |
23721387 SW |
894 | { |
895 | /* check for REQUEST frame */ | |
1eda58bf | 896 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 897 | return false; |
23721387 SW |
898 | |
899 | /* sanity check, this should not happen on a normal switch, | |
900 | * we ignore it in this case. | |
901 | */ | |
1eda58bf | 902 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 903 | return true; |
23721387 | 904 | |
39c75a51 | 905 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 906 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 907 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 908 | |
3b300de3 | 909 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 910 | return true; |
23721387 SW |
911 | } |
912 | ||
62fe710f SE |
913 | /** |
914 | * batadv_handle_unclaim - check for UNCLAIM frame | |
04e14be6 SW |
915 | * @bat_priv: the bat priv with all the soft interface information |
916 | * @primary_if: the primary hard interface of this batman soft interface | |
917 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
918 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
919 | * @vid: the VLAN ID of the frame | |
62fe710f | 920 | * |
4b426b10 | 921 | * Return: true if handled |
62fe710f | 922 | */ |
4b426b10 SE |
923 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
924 | struct batadv_hard_iface *primary_if, | |
925 | u8 *backbone_addr, u8 *claim_addr, | |
926 | unsigned short vid) | |
23721387 | 927 | { |
bae98774 | 928 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
929 | |
930 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
931 | if (primary_if && batadv_compare_eth(backbone_addr, |
932 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 933 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 934 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 935 | |
3b300de3 | 936 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
937 | |
938 | if (!backbone_gw) | |
4b426b10 | 939 | return true; |
23721387 SW |
940 | |
941 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 942 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 943 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 944 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 945 | |
3b300de3 | 946 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 947 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 948 | return true; |
23721387 SW |
949 | } |
950 | ||
62fe710f SE |
951 | /** |
952 | * batadv_handle_claim - check for CLAIM frame | |
04e14be6 SW |
953 | * @bat_priv: the bat priv with all the soft interface information |
954 | * @primary_if: the primary hard interface of this batman soft interface | |
955 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
956 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
957 | * @vid: the VLAN ID of the frame | |
62fe710f | 958 | * |
4b426b10 | 959 | * Return: true if handled |
62fe710f | 960 | */ |
4b426b10 SE |
961 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
962 | struct batadv_hard_iface *primary_if, | |
963 | u8 *backbone_addr, u8 *claim_addr, | |
964 | unsigned short vid) | |
23721387 | 965 | { |
bae98774 | 966 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
967 | |
968 | /* register the gateway if not yet available, and add the claim. */ | |
969 | ||
52aebd6a SW |
970 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
971 | false); | |
23721387 SW |
972 | |
973 | if (unlikely(!backbone_gw)) | |
4b426b10 | 974 | return true; |
23721387 SW |
975 | |
976 | /* this must be a CLAIM frame */ | |
3b300de3 | 977 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 978 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 979 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 980 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
981 | |
982 | /* TODO: we could call something like tt_local_del() here. */ | |
983 | ||
c8b86c12 | 984 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 985 | return true; |
23721387 SW |
986 | } |
987 | ||
2c53040f | 988 | /** |
04e14be6 | 989 | * batadv_check_claim_group - check for claim group membership |
2c53040f | 990 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 991 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
992 | * @hw_src: the Hardware source in the ARP Header |
993 | * @hw_dst: the Hardware destination in the ARP Header | |
994 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
995 | * | |
996 | * checks if it is a claim packet and if its on the same group. | |
997 | * This function also applies the group ID of the sender | |
998 | * if it is in the same mesh. | |
999 | * | |
62fe710f | 1000 | * Return: |
38ef3d1d SW |
1001 | * 2 - if it is a claim packet and on the same group |
1002 | * 1 - if is a claim packet from another group | |
1003 | * 0 - if it is not a claim packet | |
1004 | */ | |
56303d34 SE |
1005 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1006 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1007 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1008 | struct ethhdr *ethhdr) |
38ef3d1d | 1009 | { |
6b5e971a | 1010 | u8 *backbone_addr; |
56303d34 | 1011 | struct batadv_orig_node *orig_node; |
96412690 | 1012 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1013 | |
96412690 | 1014 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1015 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1016 | |
38ef3d1d SW |
1017 | /* if announcement packet, use the source, |
1018 | * otherwise assume it is in the hw_src | |
1019 | */ | |
1020 | switch (bla_dst->type) { | |
3eb8773e | 1021 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1022 | backbone_addr = hw_src; |
1023 | break; | |
acd34afa SE |
1024 | case BATADV_CLAIM_TYPE_REQUEST: |
1025 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1026 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1027 | backbone_addr = ethhdr->h_source; |
1028 | break; | |
1029 | default: | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1034 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1035 | return 0; |
1036 | ||
1037 | /* if its already the same group, it is fine. */ | |
1038 | if (bla_dst->group == bla_dst_own->group) | |
1039 | return 2; | |
1040 | ||
1041 | /* lets see if this originator is in our mesh */ | |
da641193 | 1042 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
1043 | |
1044 | /* dont accept claims from gateways which are not in | |
1045 | * the same mesh or group. | |
1046 | */ | |
1047 | if (!orig_node) | |
1048 | return 1; | |
1049 | ||
1050 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1051 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1052 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1053 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1054 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1055 | bla_dst_own->group = bla_dst->group; |
1056 | } | |
1057 | ||
5d967310 | 1058 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1059 | |
1060 | return 2; | |
1061 | } | |
1062 | ||
1b371d13 | 1063 | /** |
04e14be6 | 1064 | * batadv_bla_process_claim - Check if this is a claim frame, and process it |
1b371d13 | 1065 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1066 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1067 | * @skb: the frame to be checked |
1068 | * | |
4b426b10 | 1069 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1070 | * tell the callee that it can use the frame on its own. |
1071 | */ | |
4b426b10 SE |
1072 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1073 | struct batadv_hard_iface *primary_if, | |
1074 | struct sk_buff *skb) | |
23721387 | 1075 | { |
d46b6bfa | 1076 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1077 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1078 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1079 | struct ethhdr *ethhdr; |
23721387 | 1080 | struct arphdr *arphdr; |
c018ad3d | 1081 | unsigned short vid; |
d46b6bfa | 1082 | int vlan_depth = 0; |
293e9338 | 1083 | __be16 proto; |
23721387 | 1084 | int headlen; |
38ef3d1d | 1085 | int ret; |
23721387 | 1086 | |
c018ad3d | 1087 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1088 | ethhdr = eth_hdr(skb); |
23721387 | 1089 | |
c018ad3d AQ |
1090 | proto = ethhdr->h_proto; |
1091 | headlen = ETH_HLEN; | |
1092 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1093 | /* Traverse the VLAN/Ethertypes. |
1094 | * | |
1095 | * At this point it is known that the first protocol is a VLAN | |
1096 | * header, so start checking at the encapsulated protocol. | |
1097 | * | |
1098 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1099 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1100 | */ | |
1101 | do { | |
1102 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1103 | &vhdr_buf); | |
1104 | if (!vhdr) | |
4b426b10 | 1105 | return false; |
d46b6bfa SW |
1106 | |
1107 | proto = vhdr->h_vlan_encapsulated_proto; | |
1108 | headlen += VLAN_HLEN; | |
1109 | vlan_depth++; | |
1110 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1111 | } |
1112 | ||
293e9338 | 1113 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1114 | return false; /* not a claim frame */ |
23721387 SW |
1115 | |
1116 | /* this must be a ARP frame. check if it is a claim. */ | |
1117 | ||
1118 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1119 | return false; |
23721387 SW |
1120 | |
1121 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1122 | ethhdr = eth_hdr(skb); |
6b5e971a | 1123 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1124 | |
1125 | /* Check whether the ARP frame carries a valid | |
1126 | * IP information | |
1127 | */ | |
23721387 | 1128 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1129 | return false; |
23721387 | 1130 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1131 | return false; |
23721387 | 1132 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1133 | return false; |
23721387 | 1134 | if (arphdr->ar_pln != 4) |
4b426b10 | 1135 | return false; |
23721387 | 1136 | |
6b5e971a | 1137 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1138 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1139 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1140 | bla_dst_own = &bat_priv->bla.claim_dest; |
1141 | ||
1142 | /* check if it is a claim frame in general */ | |
1143 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1144 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1145 | return false; |
d46b6bfa SW |
1146 | |
1147 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1148 | * drop that, as this is not supported by BLA but should also not be | |
1149 | * sent via the mesh. | |
1150 | */ | |
1151 | if (vlan_depth > 1) | |
4b426b10 | 1152 | return true; |
23721387 | 1153 | |
cd9c7bfb SW |
1154 | /* Let the loopdetect frames on the mesh in any case. */ |
1155 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1156 | return false; |
cd9c7bfb | 1157 | |
23721387 | 1158 | /* check if it is a claim frame. */ |
3b300de3 SE |
1159 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1160 | ethhdr); | |
38ef3d1d | 1161 | if (ret == 1) |
39c75a51 | 1162 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1163 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
1164 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
1165 | hw_dst); | |
38ef3d1d SW |
1166 | |
1167 | if (ret < 2) | |
4b426b10 | 1168 | return !!ret; |
23721387 SW |
1169 | |
1170 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1171 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1172 | |
1173 | /* check for the different types of claim frames ... */ | |
1174 | switch (bla_dst->type) { | |
3eb8773e | 1175 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1176 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1177 | ethhdr->h_source, vid)) | |
4b426b10 | 1178 | return true; |
23721387 | 1179 | break; |
3eb8773e | 1180 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1181 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1182 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1183 | return true; |
23721387 SW |
1184 | break; |
1185 | ||
acd34afa | 1186 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1187 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1188 | vid)) | |
4b426b10 | 1189 | return true; |
23721387 | 1190 | break; |
acd34afa | 1191 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1192 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1193 | vid)) | |
4b426b10 | 1194 | return true; |
23721387 SW |
1195 | break; |
1196 | } | |
1197 | ||
39c75a51 | 1198 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1199 | "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 | 1200 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
4b426b10 | 1201 | return true; |
23721387 SW |
1202 | } |
1203 | ||
04e14be6 SW |
1204 | /** |
1205 | * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or | |
1206 | * immediately | |
1207 | * @bat_priv: the bat priv with all the soft interface information | |
1208 | * @now: whether the whole hash shall be wiped now | |
1209 | * | |
1210 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1211 | * a time out, or clean all backbone gws if now is set. |
1212 | */ | |
56303d34 | 1213 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1214 | { |
bae98774 | 1215 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1216 | struct hlist_node *node_tmp; |
23721387 | 1217 | struct hlist_head *head; |
5bf74e9c | 1218 | struct batadv_hashtable *hash; |
23721387 SW |
1219 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1220 | int i; | |
1221 | ||
807736f6 | 1222 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1223 | if (!hash) |
1224 | return; | |
1225 | ||
1226 | for (i = 0; i < hash->size; i++) { | |
1227 | head = &hash->table[i]; | |
1228 | list_lock = &hash->list_locks[i]; | |
1229 | ||
1230 | spin_lock_bh(list_lock); | |
b67bfe0d | 1231 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1232 | head, hash_entry) { |
1233 | if (now) | |
1234 | goto purge_now; | |
1eda58bf | 1235 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1236 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1237 | continue; |
1238 | ||
39c75a51 | 1239 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1240 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1241 | backbone_gw->orig); | |
23721387 SW |
1242 | |
1243 | purge_now: | |
1244 | /* don't wait for the pending request anymore */ | |
1245 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1246 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1247 | |
3b300de3 | 1248 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1249 | |
b67bfe0d | 1250 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1251 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1252 | } |
1253 | spin_unlock_bh(list_lock); | |
1254 | } | |
1255 | } | |
1256 | ||
2c53040f | 1257 | /** |
04e14be6 | 1258 | * batadv_bla_purge_claims - Remove claims after a timeout or immediately |
2c53040f | 1259 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1260 | * @primary_if: the selected primary interface, may be NULL if now is set |
1261 | * @now: whether the whole hash shall be wiped now | |
1262 | * | |
1263 | * Check when we heard last time from our own claims, and remove them in case of | |
1264 | * a time out, or clean all claims if now is set | |
1265 | */ | |
56303d34 SE |
1266 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1267 | struct batadv_hard_iface *primary_if, | |
1268 | int now) | |
23721387 | 1269 | { |
3db0decf | 1270 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1271 | struct batadv_bla_claim *claim; |
23721387 | 1272 | struct hlist_head *head; |
5bf74e9c | 1273 | struct batadv_hashtable *hash; |
23721387 SW |
1274 | int i; |
1275 | ||
807736f6 | 1276 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1277 | if (!hash) |
1278 | return; | |
1279 | ||
1280 | for (i = 0; i < hash->size; i++) { | |
1281 | head = &hash->table[i]; | |
1282 | ||
1283 | rcu_read_lock(); | |
b67bfe0d | 1284 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1285 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1286 | if (now) |
1287 | goto purge_now; | |
3db0decf SE |
1288 | |
1289 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1290 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1291 | goto skip; |
1292 | ||
1eda58bf | 1293 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1294 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1295 | goto skip; |
23721387 | 1296 | |
39c75a51 | 1297 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1298 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1299 | claim->addr, claim->vid); | |
23721387 SW |
1300 | |
1301 | purge_now: | |
3b300de3 | 1302 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1303 | backbone_gw->orig, |
3b300de3 | 1304 | claim->addr, claim->vid); |
3db0decf SE |
1305 | skip: |
1306 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1307 | } |
1308 | rcu_read_unlock(); | |
1309 | } | |
1310 | } | |
1311 | ||
2c53040f | 1312 | /** |
04e14be6 SW |
1313 | * batadv_bla_update_orig_address - Update the backbone gateways when the own |
1314 | * originator address changes | |
2c53040f | 1315 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1316 | * @primary_if: the new selected primary_if |
1317 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1318 | */ |
56303d34 SE |
1319 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1320 | struct batadv_hard_iface *primary_if, | |
1321 | struct batadv_hard_iface *oldif) | |
23721387 | 1322 | { |
bae98774 | 1323 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1324 | struct hlist_head *head; |
5bf74e9c | 1325 | struct batadv_hashtable *hash; |
807736f6 | 1326 | __be16 group; |
23721387 SW |
1327 | int i; |
1328 | ||
38ef3d1d | 1329 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1330 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1331 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1332 | |
d5b4c93e SW |
1333 | /* purge everything when bridge loop avoidance is turned off */ |
1334 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1335 | oldif = NULL; | |
1336 | ||
23721387 | 1337 | if (!oldif) { |
3b300de3 SE |
1338 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1339 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1340 | return; |
1341 | } | |
1342 | ||
807736f6 | 1343 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1344 | if (!hash) |
1345 | return; | |
1346 | ||
1347 | for (i = 0; i < hash->size; i++) { | |
1348 | head = &hash->table[i]; | |
1349 | ||
1350 | rcu_read_lock(); | |
b67bfe0d | 1351 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1352 | /* own orig still holds the old value. */ |
1eda58bf SE |
1353 | if (!batadv_compare_eth(backbone_gw->orig, |
1354 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1355 | continue; |
1356 | ||
8fdd0153 AQ |
1357 | ether_addr_copy(backbone_gw->orig, |
1358 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1359 | /* send an announce frame so others will ask for our |
1360 | * claims and update their tables. | |
1361 | */ | |
3b300de3 | 1362 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1363 | } |
1364 | rcu_read_unlock(); | |
1365 | } | |
1366 | } | |
1367 | ||
cd9c7bfb SW |
1368 | /** |
1369 | * batadv_bla_send_loopdetect - send a loopdetect frame | |
1370 | * @bat_priv: the bat priv with all the soft interface information | |
1371 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1372 | * | |
1373 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1374 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1375 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1376 | * indicates that there is a loop. | |
1377 | */ | |
1378 | static void | |
1379 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1380 | struct batadv_bla_backbone_gw *backbone_gw) | |
1381 | { | |
1382 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1383 | backbone_gw->vid); | |
1384 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1385 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1386 | } | |
1387 | ||
d68081a2 SW |
1388 | /** |
1389 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1390 | * @net_dev: the soft interface net device | |
1391 | */ | |
1392 | void batadv_bla_status_update(struct net_device *net_dev) | |
1393 | { | |
1394 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1395 | struct batadv_hard_iface *primary_if; | |
1396 | ||
1397 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1398 | if (!primary_if) | |
1399 | return; | |
1400 | ||
1401 | /* this function already purges everything when bla is disabled, | |
1402 | * so just call that one. | |
1403 | */ | |
1404 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1405 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1406 | } |
1407 | ||
04e14be6 SW |
1408 | /** |
1409 | * batadv_bla_periodic_work - performs periodic bla work | |
1410 | * @work: kernel work struct | |
1411 | * | |
1412 | * periodic work to do: | |
23721387 SW |
1413 | * * purge structures when they are too old |
1414 | * * send announcements | |
1415 | */ | |
3b300de3 | 1416 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1417 | { |
bbb1f90e | 1418 | struct delayed_work *delayed_work; |
56303d34 | 1419 | struct batadv_priv *bat_priv; |
807736f6 | 1420 | struct batadv_priv_bla *priv_bla; |
23721387 | 1421 | struct hlist_head *head; |
bae98774 | 1422 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1423 | struct batadv_hashtable *hash; |
56303d34 | 1424 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1425 | bool send_loopdetect = false; |
23721387 SW |
1426 | int i; |
1427 | ||
4ba4bc0f | 1428 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1429 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1430 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1431 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1432 | if (!primary_if) |
1433 | goto out; | |
1434 | ||
3b300de3 SE |
1435 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1436 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1437 | |
1438 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1439 | goto out; | |
1440 | ||
cd9c7bfb SW |
1441 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1442 | /* set a new random mac address for the next bridge loop | |
1443 | * detection frames. Set the locally administered bit to avoid | |
1444 | * collisions with users mac addresses. | |
1445 | */ | |
1446 | random_ether_addr(bat_priv->bla.loopdetect_addr); | |
1447 | bat_priv->bla.loopdetect_addr[0] = 0xba; | |
1448 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1449 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1450 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1451 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1452 | ||
1453 | /* mark for sending loop detect on all VLANs */ | |
1454 | send_loopdetect = true; | |
1455 | } | |
1456 | ||
807736f6 | 1457 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1458 | if (!hash) |
1459 | goto out; | |
1460 | ||
1461 | for (i = 0; i < hash->size; i++) { | |
1462 | head = &hash->table[i]; | |
1463 | ||
1464 | rcu_read_lock(); | |
b67bfe0d | 1465 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1466 | if (!batadv_compare_eth(backbone_gw->orig, |
1467 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1468 | continue; |
1469 | ||
1470 | backbone_gw->lasttime = jiffies; | |
1471 | ||
3b300de3 | 1472 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1473 | if (send_loopdetect) |
1474 | batadv_bla_send_loopdetect(bat_priv, | |
1475 | backbone_gw); | |
d807f272 SW |
1476 | |
1477 | /* request_sent is only set after creation to avoid | |
1478 | * problems when we are not yet known as backbone gw | |
1479 | * in the backbone. | |
1480 | * | |
28709878 SW |
1481 | * We can reset this now after we waited some periods |
1482 | * to give bridge forward delays and bla group forming | |
1483 | * some grace time. | |
d807f272 SW |
1484 | */ |
1485 | ||
1486 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1487 | continue; | |
1488 | ||
28709878 SW |
1489 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1490 | continue; | |
1491 | ||
d807f272 SW |
1492 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1493 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1494 | } |
1495 | rcu_read_unlock(); | |
1496 | } | |
1497 | out: | |
1498 | if (primary_if) | |
82047ad7 | 1499 | batadv_hardif_put(primary_if); |
23721387 | 1500 | |
72414442 AQ |
1501 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1502 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1503 | } |
1504 | ||
5d52dad2 SE |
1505 | /* The hash for claim and backbone hash receive the same key because they |
1506 | * are getting initialized by hash_new with the same key. Reinitializing | |
1507 | * them with to different keys to allow nested locking without generating | |
1508 | * lockdep warnings | |
1509 | */ | |
3b300de3 SE |
1510 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1511 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1512 | |
04e14be6 SW |
1513 | /** |
1514 | * batadv_bla_init - initialize all bla structures | |
1515 | * @bat_priv: the bat priv with all the soft interface information | |
1516 | * | |
1517 | * Return: 0 on success, < 0 on error. | |
1518 | */ | |
56303d34 | 1519 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1520 | { |
fe2da6ff | 1521 | int i; |
6b5e971a | 1522 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1523 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1524 | u16 crc; |
807736f6 | 1525 | unsigned long entrytime; |
fe2da6ff | 1526 | |
7dac7b76 LL |
1527 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1528 | ||
39c75a51 | 1529 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1530 | |
38ef3d1d | 1531 | /* setting claim destination address */ |
807736f6 SE |
1532 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1533 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1534 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1535 | if (primary_if) { |
807736f6 SE |
1536 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1537 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1538 | batadv_hardif_put(primary_if); |
38ef3d1d | 1539 | } else { |
807736f6 | 1540 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1541 | } |
1542 | ||
fe2da6ff | 1543 | /* initialize the duplicate list */ |
807736f6 | 1544 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1545 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1546 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1547 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1548 | |
cd9c7bfb SW |
1549 | atomic_set(&bat_priv->bla.loopdetect_next, |
1550 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1551 | ||
807736f6 | 1552 | if (bat_priv->bla.claim_hash) |
5346c35e | 1553 | return 0; |
23721387 | 1554 | |
807736f6 SE |
1555 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1556 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1557 | |
807736f6 | 1558 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1559 | return -ENOMEM; |
23721387 | 1560 | |
807736f6 | 1561 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1562 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1563 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1564 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1565 | |
39c75a51 | 1566 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1567 | |
72414442 AQ |
1568 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1569 | ||
1570 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1571 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1572 | return 0; |
23721387 SW |
1573 | } |
1574 | ||
2c53040f | 1575 | /** |
04e14be6 | 1576 | * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. |
2c53040f | 1577 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1578 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1579 | * |
1580 | * check if it is on our broadcast list. Another gateway might | |
1581 | * have sent the same packet because it is connected to the same backbone, | |
1582 | * so we have to remove this duplicate. | |
1583 | * | |
1584 | * This is performed by checking the CRC, which will tell us | |
1585 | * with a good chance that it is the same packet. If it is furthermore | |
1586 | * sent by another host, drop it. We allow equal packets from | |
1587 | * the same host however as this might be intended. | |
04e14be6 | 1588 | * |
4b426b10 | 1589 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1590 | */ |
4b426b10 SE |
1591 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
1592 | struct sk_buff *skb) | |
fe2da6ff | 1593 | { |
4b426b10 | 1594 | int i, curr; |
004e86fc SW |
1595 | __be32 crc; |
1596 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1597 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1598 | bool ret = false; |
fe2da6ff | 1599 | |
004e86fc | 1600 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1601 | |
1602 | /* calculate the crc ... */ | |
004e86fc | 1603 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1604 | |
7dac7b76 LL |
1605 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1606 | ||
42d0b044 | 1607 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1608 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1609 | curr %= BATADV_DUPLIST_SIZE; | |
1610 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1611 | |
1612 | /* we can stop searching if the entry is too old ; | |
1613 | * later entries will be even older | |
1614 | */ | |
42d0b044 SE |
1615 | if (batadv_has_timed_out(entry->entrytime, |
1616 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1617 | break; |
1618 | ||
1619 | if (entry->crc != crc) | |
1620 | continue; | |
1621 | ||
1eda58bf | 1622 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1623 | continue; |
1624 | ||
1625 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1626 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1627 | */ |
4b426b10 | 1628 | ret = true; |
7dac7b76 | 1629 | goto out; |
fe2da6ff | 1630 | } |
7dac7b76 | 1631 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1632 | * and allow it, its the first occurrence. |
7dac7b76 | 1633 | */ |
807736f6 | 1634 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1635 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1636 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1637 | entry->crc = crc; |
1638 | entry->entrytime = jiffies; | |
8fdd0153 | 1639 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1640 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1641 | |
7dac7b76 LL |
1642 | out: |
1643 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1644 | ||
1645 | return ret; | |
fe2da6ff SW |
1646 | } |
1647 | ||
1b371d13 | 1648 | /** |
04e14be6 SW |
1649 | * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for |
1650 | * the VLAN identified by vid. | |
1b371d13 | 1651 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1652 | * @orig: originator mac address |
cfd4f757 | 1653 | * @vid: VLAN identifier |
20ff9d59 | 1654 | * |
62fe710f | 1655 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1656 | */ |
6b5e971a | 1657 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1658 | unsigned short vid) |
20ff9d59 | 1659 | { |
807736f6 | 1660 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1661 | struct hlist_head *head; |
bae98774 | 1662 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1663 | int i; |
1664 | ||
1665 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1666 | return false; |
20ff9d59 SW |
1667 | |
1668 | if (!hash) | |
cfd4f757 | 1669 | return false; |
20ff9d59 SW |
1670 | |
1671 | for (i = 0; i < hash->size; i++) { | |
1672 | head = &hash->table[i]; | |
1673 | ||
1674 | rcu_read_lock(); | |
b67bfe0d | 1675 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1676 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1677 | backbone_gw->vid == vid) { | |
20ff9d59 | 1678 | rcu_read_unlock(); |
cfd4f757 | 1679 | return true; |
20ff9d59 SW |
1680 | } |
1681 | } | |
1682 | rcu_read_unlock(); | |
1683 | } | |
1684 | ||
cfd4f757 | 1685 | return false; |
20ff9d59 SW |
1686 | } |
1687 | ||
2c53040f | 1688 | /** |
04e14be6 | 1689 | * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. |
2c53040f | 1690 | * @skb: the frame to be checked |
23721387 SW |
1691 | * @orig_node: the orig_node of the frame |
1692 | * @hdr_size: maximum length of the frame | |
1693 | * | |
4b426b10 SE |
1694 | * Return: true if the orig_node is also a gateway on the soft interface, |
1695 | * otherwise it returns false. | |
23721387 | 1696 | */ |
4b426b10 SE |
1697 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1698 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1699 | { |
bae98774 | 1700 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1701 | unsigned short vid; |
23721387 SW |
1702 | |
1703 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1704 | return false; |
23721387 SW |
1705 | |
1706 | /* first, find out the vid. */ | |
0d125074 | 1707 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1708 | return false; |
23721387 | 1709 | |
c018ad3d | 1710 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1711 | |
1712 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1713 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1714 | orig_node->orig, vid); | |
23721387 | 1715 | if (!backbone_gw) |
4b426b10 | 1716 | return false; |
23721387 | 1717 | |
c8b86c12 | 1718 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1719 | return true; |
23721387 SW |
1720 | } |
1721 | ||
04e14be6 | 1722 | /** |
6d030de8 | 1723 | * batadv_bla_free - free all bla structures |
04e14be6 SW |
1724 | * @bat_priv: the bat priv with all the soft interface information |
1725 | * | |
1726 | * for softinterface free or module unload | |
1727 | */ | |
56303d34 | 1728 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1729 | { |
56303d34 | 1730 | struct batadv_hard_iface *primary_if; |
23721387 | 1731 | |
807736f6 | 1732 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1733 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1734 | |
807736f6 | 1735 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1736 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1737 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1738 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1739 | } |
807736f6 | 1740 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1741 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1742 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1743 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1744 | } |
1745 | if (primary_if) | |
82047ad7 | 1746 | batadv_hardif_put(primary_if); |
23721387 SW |
1747 | } |
1748 | ||
cd9c7bfb SW |
1749 | /** |
1750 | * batadv_bla_loopdetect_check - check and handle a detected loop | |
1751 | * @bat_priv: the bat priv with all the soft interface information | |
1752 | * @skb: the packet to check | |
1753 | * @primary_if: interface where the request came on | |
1754 | * @vid: the VLAN ID of the frame | |
1755 | * | |
1756 | * Checks if this packet is a loop detect frame which has been sent by us, | |
1757 | * throw an uevent and log the event if that is the case. | |
1758 | * | |
1759 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1760 | * otherwise. | |
1761 | */ | |
1762 | static bool | |
1763 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1764 | struct batadv_hard_iface *primary_if, | |
1765 | unsigned short vid) | |
1766 | { | |
1767 | struct batadv_bla_backbone_gw *backbone_gw; | |
1768 | struct ethhdr *ethhdr; | |
1769 | ||
1770 | ethhdr = eth_hdr(skb); | |
1771 | ||
1772 | /* Only check for the MAC address and skip more checks here for | |
1773 | * performance reasons - this function is on the hotpath, after all. | |
1774 | */ | |
1775 | if (!batadv_compare_eth(ethhdr->h_source, | |
1776 | bat_priv->bla.loopdetect_addr)) | |
1777 | return false; | |
1778 | ||
1779 | /* If the packet came too late, don't forward it on the mesh | |
1780 | * but don't consider that as loop. It might be a coincidence. | |
1781 | */ | |
1782 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1783 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1784 | return true; | |
1785 | ||
1786 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1787 | primary_if->net_dev->dev_addr, | |
1788 | vid, true); | |
1789 | if (unlikely(!backbone_gw)) | |
1790 | return true; | |
1791 | ||
1792 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); | |
1793 | /* backbone_gw is unreferenced in the report work function function */ | |
1794 | ||
1795 | return true; | |
1796 | } | |
1797 | ||
2c53040f | 1798 | /** |
04e14be6 | 1799 | * batadv_bla_rx - check packets coming from the mesh. |
2c53040f | 1800 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1801 | * @skb: the frame to be checked |
1802 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1803 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1804 | * |
04e14be6 | 1805 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1806 | * * we have to race for a claim |
1807 | * * if the frame is allowed on the LAN | |
1808 | * | |
62fe710f SE |
1809 | * in these cases, the skb is further handled by this function |
1810 | * | |
4b426b10 SE |
1811 | * Return: true if handled, otherwise it returns false and the caller shall |
1812 | * further process the skb. | |
23721387 | 1813 | */ |
4b426b10 SE |
1814 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1815 | unsigned short vid, bool is_bcast) | |
23721387 | 1816 | { |
3db0decf | 1817 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1818 | struct ethhdr *ethhdr; |
712bbfe4 | 1819 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1820 | struct batadv_hard_iface *primary_if; |
3db0decf | 1821 | bool own_claim; |
4b426b10 | 1822 | bool ret; |
23721387 | 1823 | |
7ed4be95 | 1824 | ethhdr = eth_hdr(skb); |
23721387 | 1825 | |
e5d89254 | 1826 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1827 | if (!primary_if) |
1828 | goto handled; | |
1829 | ||
1830 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1831 | goto allow; | |
1832 | ||
cd9c7bfb SW |
1833 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1834 | goto handled; | |
1835 | ||
807736f6 | 1836 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1837 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1838 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1839 | goto handled; |
1840 | ||
8fdd0153 | 1841 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1842 | search_claim.vid = vid; |
3b300de3 | 1843 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1844 | |
1845 | if (!claim) { | |
1846 | /* possible optimization: race for a claim */ | |
1847 | /* No claim exists yet, claim it for us! | |
1848 | */ | |
3b300de3 SE |
1849 | batadv_handle_claim(bat_priv, primary_if, |
1850 | primary_if->net_dev->dev_addr, | |
1851 | ethhdr->h_source, vid); | |
23721387 SW |
1852 | goto allow; |
1853 | } | |
1854 | ||
1855 | /* if it is our own claim ... */ | |
3db0decf SE |
1856 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1857 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1858 | primary_if->net_dev->dev_addr); | |
1859 | batadv_backbone_gw_put(backbone_gw); | |
1860 | ||
1861 | if (own_claim) { | |
23721387 SW |
1862 | /* ... allow it in any case */ |
1863 | claim->lasttime = jiffies; | |
1864 | goto allow; | |
1865 | } | |
1866 | ||
1867 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1868 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1869 | /* ... drop it. the responsible gateway is in charge. | |
1870 | * | |
1871 | * We need to check is_bcast because with the gateway | |
1872 | * feature, broadcasts (like DHCP requests) may be sent | |
1873 | * using a unicast packet type. | |
1874 | */ | |
23721387 SW |
1875 | goto handled; |
1876 | } else { | |
1877 | /* seems the client considers us as its best gateway. | |
1878 | * send a claim and update the claim table | |
1879 | * immediately. | |
1880 | */ | |
3b300de3 SE |
1881 | batadv_handle_claim(bat_priv, primary_if, |
1882 | primary_if->net_dev->dev_addr, | |
1883 | ethhdr->h_source, vid); | |
23721387 SW |
1884 | goto allow; |
1885 | } | |
1886 | allow: | |
3b300de3 | 1887 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1888 | ret = false; |
23721387 SW |
1889 | goto out; |
1890 | ||
1891 | handled: | |
1892 | kfree_skb(skb); | |
4b426b10 | 1893 | ret = true; |
23721387 SW |
1894 | |
1895 | out: | |
1896 | if (primary_if) | |
82047ad7 | 1897 | batadv_hardif_put(primary_if); |
23721387 | 1898 | if (claim) |
321e3e08 | 1899 | batadv_claim_put(claim); |
23721387 SW |
1900 | return ret; |
1901 | } | |
1902 | ||
2c53040f | 1903 | /** |
04e14be6 | 1904 | * batadv_bla_tx - check packets going into the mesh |
2c53040f | 1905 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1906 | * @skb: the frame to be checked |
1907 | * @vid: the VLAN ID of the frame | |
1908 | * | |
04e14be6 | 1909 | * batadv_bla_tx checks if: |
23721387 SW |
1910 | * * a claim was received which has to be processed |
1911 | * * the frame is allowed on the mesh | |
1912 | * | |
62fe710f | 1913 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1914 | * |
1915 | * This call might reallocate skb data. | |
62fe710f | 1916 | * |
4b426b10 SE |
1917 | * Return: true if handled, otherwise it returns false and the caller shall |
1918 | * further process the skb. | |
23721387 | 1919 | */ |
4b426b10 SE |
1920 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1921 | unsigned short vid) | |
23721387 SW |
1922 | { |
1923 | struct ethhdr *ethhdr; | |
712bbfe4 | 1924 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 1925 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 1926 | struct batadv_hard_iface *primary_if; |
3db0decf | 1927 | bool client_roamed; |
4b426b10 | 1928 | bool ret = false; |
23721387 | 1929 | |
e5d89254 | 1930 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1931 | if (!primary_if) |
1932 | goto out; | |
1933 | ||
1934 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1935 | goto allow; | |
1936 | ||
3b300de3 | 1937 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1938 | goto handled; |
1939 | ||
7ed4be95 | 1940 | ethhdr = eth_hdr(skb); |
23721387 | 1941 | |
807736f6 | 1942 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1943 | /* don't allow broadcasts while requests are in flight */ |
1944 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1945 | goto handled; | |
1946 | ||
8fdd0153 | 1947 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1948 | search_claim.vid = vid; |
1949 | ||
3b300de3 | 1950 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1951 | |
1952 | /* if no claim exists, allow it. */ | |
1953 | if (!claim) | |
1954 | goto allow; | |
1955 | ||
1956 | /* check if we are responsible. */ | |
3db0decf SE |
1957 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1958 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
1959 | primary_if->net_dev->dev_addr); | |
1960 | batadv_backbone_gw_put(backbone_gw); | |
1961 | ||
1962 | if (client_roamed) { | |
23721387 SW |
1963 | /* if yes, the client has roamed and we have |
1964 | * to unclaim it. | |
1965 | */ | |
3b300de3 SE |
1966 | batadv_handle_unclaim(bat_priv, primary_if, |
1967 | primary_if->net_dev->dev_addr, | |
1968 | ethhdr->h_source, vid); | |
23721387 SW |
1969 | goto allow; |
1970 | } | |
1971 | ||
1972 | /* check if it is a multicast/broadcast frame */ | |
1973 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1974 | /* drop it. the responsible gateway has forwarded it into | |
1975 | * the backbone network. | |
1976 | */ | |
1977 | goto handled; | |
1978 | } else { | |
1979 | /* we must allow it. at least if we are | |
1980 | * responsible for the DESTINATION. | |
1981 | */ | |
1982 | goto allow; | |
1983 | } | |
1984 | allow: | |
3b300de3 | 1985 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1986 | ret = false; |
23721387 SW |
1987 | goto out; |
1988 | handled: | |
4b426b10 | 1989 | ret = true; |
23721387 SW |
1990 | out: |
1991 | if (primary_if) | |
82047ad7 | 1992 | batadv_hardif_put(primary_if); |
23721387 | 1993 | if (claim) |
321e3e08 | 1994 | batadv_claim_put(claim); |
23721387 SW |
1995 | return ret; |
1996 | } | |
9bf8e4d4 | 1997 | |
dc1cbd14 | 1998 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 SW |
1999 | /** |
2000 | * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file | |
2001 | * @seq: seq file to print on | |
2002 | * @offset: not used | |
2003 | * | |
2004 | * Return: always 0 | |
2005 | */ | |
08adf151 | 2006 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
2007 | { |
2008 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 2009 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 2010 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
3db0decf | 2011 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 2012 | struct batadv_bla_claim *claim; |
56303d34 | 2013 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 2014 | struct hlist_head *head; |
5a1dd8a4 | 2015 | u16 backbone_crc; |
6b5e971a | 2016 | u32 i; |
9bf8e4d4 | 2017 | bool is_own; |
6b5e971a | 2018 | u8 *primary_addr; |
9bf8e4d4 | 2019 | |
30da63a6 ML |
2020 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2021 | if (!primary_if) | |
9bf8e4d4 | 2022 | goto out; |
9bf8e4d4 | 2023 | |
1eda58bf | 2024 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 2025 | seq_printf(seq, |
39a32991 | 2026 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 2027 | net_dev->name, primary_addr, |
807736f6 | 2028 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 AQ |
2029 | seq_puts(seq, |
2030 | " Client VID Originator [o] (CRC )\n"); | |
9bf8e4d4 SW |
2031 | for (i = 0; i < hash->size; i++) { |
2032 | head = &hash->table[i]; | |
2033 | ||
2034 | rcu_read_lock(); | |
b67bfe0d | 2035 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf SE |
2036 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2037 | ||
2038 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 2039 | primary_addr); |
5a1dd8a4 | 2040 | |
3db0decf SE |
2041 | spin_lock_bh(&backbone_gw->crc_lock); |
2042 | backbone_crc = backbone_gw->crc; | |
2043 | spin_unlock_bh(&backbone_gw->crc_lock); | |
eb2deb6b | 2044 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 2045 | claim->addr, BATADV_PRINT_VID(claim->vid), |
3db0decf | 2046 | backbone_gw->orig, |
9bf8e4d4 | 2047 | (is_own ? 'x' : ' '), |
5a1dd8a4 | 2048 | backbone_crc); |
3db0decf SE |
2049 | |
2050 | batadv_backbone_gw_put(backbone_gw); | |
9bf8e4d4 SW |
2051 | } |
2052 | rcu_read_unlock(); | |
2053 | } | |
2054 | out: | |
2055 | if (primary_if) | |
82047ad7 | 2056 | batadv_hardif_put(primary_if); |
30da63a6 | 2057 | return 0; |
9bf8e4d4 | 2058 | } |
dc1cbd14 | 2059 | #endif |
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 | ||
dc1cbd14 | 2223 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 SW |
2224 | /** |
2225 | * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq | |
2226 | * file | |
2227 | * @seq: seq file to print on | |
2228 | * @offset: not used | |
2229 | * | |
2230 | * Return: always 0 | |
2231 | */ | |
536a23f1 SW |
2232 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
2233 | { | |
2234 | struct net_device *net_dev = (struct net_device *)seq->private; | |
2235 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 2236 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 2237 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 2238 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
2239 | struct hlist_head *head; |
2240 | int secs, msecs; | |
5a1dd8a4 | 2241 | u16 backbone_crc; |
6b5e971a | 2242 | u32 i; |
536a23f1 | 2243 | bool is_own; |
6b5e971a | 2244 | u8 *primary_addr; |
536a23f1 | 2245 | |
30da63a6 ML |
2246 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2247 | if (!primary_if) | |
536a23f1 | 2248 | goto out; |
536a23f1 SW |
2249 | |
2250 | primary_addr = primary_if->net_dev->dev_addr; | |
2251 | seq_printf(seq, | |
39a32991 | 2252 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 2253 | net_dev->name, primary_addr, |
807736f6 | 2254 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 | 2255 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
536a23f1 SW |
2256 | for (i = 0; i < hash->size; i++) { |
2257 | head = &hash->table[i]; | |
2258 | ||
2259 | rcu_read_lock(); | |
b67bfe0d | 2260 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
2261 | msecs = jiffies_to_msecs(jiffies - |
2262 | backbone_gw->lasttime); | |
2263 | secs = msecs / 1000; | |
2264 | msecs = msecs % 1000; | |
2265 | ||
2266 | is_own = batadv_compare_eth(backbone_gw->orig, | |
2267 | primary_addr); | |
2268 | if (is_own) | |
2269 | continue; | |
2270 | ||
5a1dd8a4 SW |
2271 | spin_lock_bh(&backbone_gw->crc_lock); |
2272 | backbone_crc = backbone_gw->crc; | |
2273 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2274 | ||
eb2deb6b | 2275 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
2276 | backbone_gw->orig, |
2277 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 2278 | msecs, backbone_crc); |
536a23f1 SW |
2279 | } |
2280 | rcu_read_unlock(); | |
2281 | } | |
2282 | out: | |
2283 | if (primary_if) | |
82047ad7 | 2284 | batadv_hardif_put(primary_if); |
30da63a6 | 2285 | return 0; |
536a23f1 | 2286 | } |
dc1cbd14 | 2287 | #endif |
ea4152e1 SW |
2288 | |
2289 | /** | |
2290 | * batadv_bla_backbone_dump_entry - dump one entry of the backbone table | |
2291 | * to a netlink socket | |
2292 | * @msg: buffer for the message | |
2293 | * @portid: netlink port | |
2294 | * @seq: Sequence number of netlink message | |
2295 | * @primary_if: primary interface | |
2296 | * @backbone_gw: entry to dump | |
2297 | * | |
2298 | * Return: 0 or error code. | |
2299 | */ | |
2300 | static int | |
2301 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2302 | struct batadv_hard_iface *primary_if, | |
2303 | struct batadv_bla_backbone_gw *backbone_gw) | |
2304 | { | |
2305 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2306 | u16 backbone_crc; | |
2307 | bool is_own; | |
2308 | int msecs; | |
2309 | void *hdr; | |
2310 | int ret = -EINVAL; | |
2311 | ||
2312 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2313 | NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE); | |
2314 | if (!hdr) { | |
2315 | ret = -ENOBUFS; | |
2316 | goto out; | |
2317 | } | |
2318 | ||
2319 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); | |
2320 | ||
2321 | spin_lock_bh(&backbone_gw->crc_lock); | |
2322 | backbone_crc = backbone_gw->crc; | |
2323 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2324 | ||
2325 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); | |
2326 | ||
2327 | if (is_own) | |
2328 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2329 | genlmsg_cancel(msg, hdr); | |
2330 | goto out; | |
2331 | } | |
2332 | ||
2333 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2334 | backbone_gw->orig) || | |
2335 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || | |
2336 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2337 | backbone_crc) || | |
2338 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { | |
2339 | genlmsg_cancel(msg, hdr); | |
2340 | goto out; | |
2341 | } | |
2342 | ||
2343 | genlmsg_end(msg, hdr); | |
2344 | ret = 0; | |
2345 | ||
2346 | out: | |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | /** | |
2351 | * batadv_bla_backbone_dump_bucket - dump one bucket of the backbone table | |
2352 | * to a netlink socket | |
2353 | * @msg: buffer for the message | |
2354 | * @portid: netlink port | |
2355 | * @seq: Sequence number of netlink message | |
2356 | * @primary_if: primary interface | |
2357 | * @head: bucket to dump | |
2358 | * @idx_skip: How many entries to skip | |
2359 | * | |
2360 | * Return: always 0. | |
2361 | */ | |
2362 | static int | |
2363 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2364 | struct batadv_hard_iface *primary_if, | |
2365 | struct hlist_head *head, int *idx_skip) | |
2366 | { | |
2367 | struct batadv_bla_backbone_gw *backbone_gw; | |
2368 | int idx = 0; | |
2369 | ||
2370 | rcu_read_lock(); | |
2371 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { | |
2372 | if (idx++ < *idx_skip) | |
2373 | continue; | |
2374 | if (batadv_bla_backbone_dump_entry(msg, portid, seq, | |
2375 | primary_if, backbone_gw)) { | |
2376 | *idx_skip = idx - 1; | |
2377 | goto unlock; | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | *idx_skip = idx; | |
2382 | unlock: | |
2383 | rcu_read_unlock(); | |
2384 | return 0; | |
2385 | } | |
2386 | ||
2387 | /** | |
2388 | * batadv_bla_backbone_dump - dump backbone table to a netlink socket | |
2389 | * @msg: buffer for the message | |
2390 | * @cb: callback structure containing arguments | |
2391 | * | |
2392 | * Return: message length. | |
2393 | */ | |
2394 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2395 | { | |
2396 | struct batadv_hard_iface *primary_if = NULL; | |
2397 | int portid = NETLINK_CB(cb->skb).portid; | |
2398 | struct net *net = sock_net(cb->skb->sk); | |
2399 | struct net_device *soft_iface; | |
2400 | struct batadv_hashtable *hash; | |
2401 | struct batadv_priv *bat_priv; | |
2402 | int bucket = cb->args[0]; | |
2403 | struct hlist_head *head; | |
2404 | int idx = cb->args[1]; | |
2405 | int ifindex; | |
2406 | int ret = 0; | |
2407 | ||
2408 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2409 | BATADV_ATTR_MESH_IFINDEX); | |
2410 | if (!ifindex) | |
2411 | return -EINVAL; | |
2412 | ||
2413 | soft_iface = dev_get_by_index(net, ifindex); | |
2414 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2415 | ret = -ENODEV; | |
2416 | goto out; | |
2417 | } | |
2418 | ||
2419 | bat_priv = netdev_priv(soft_iface); | |
2420 | hash = bat_priv->bla.backbone_hash; | |
2421 | ||
2422 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2423 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2424 | ret = -ENOENT; | |
2425 | goto out; | |
2426 | } | |
2427 | ||
2428 | while (bucket < hash->size) { | |
2429 | head = &hash->table[bucket]; | |
2430 | ||
2431 | if (batadv_bla_backbone_dump_bucket(msg, portid, | |
2432 | cb->nlh->nlmsg_seq, | |
2433 | primary_if, head, &idx)) | |
2434 | break; | |
2435 | bucket++; | |
2436 | } | |
2437 | ||
2438 | cb->args[0] = bucket; | |
2439 | cb->args[1] = idx; | |
2440 | ||
2441 | ret = msg->len; | |
2442 | ||
2443 | out: | |
2444 | if (primary_if) | |
2445 | batadv_hardif_put(primary_if); | |
2446 | ||
2447 | if (soft_iface) | |
2448 | dev_put(soft_iface); | |
2449 | ||
2450 | return ret; | |
2451 | } |