Commit | Line | Data |
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0046b040 | 1 | /* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: |
23721387 SW |
2 | * |
3 | * Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23721387 SW |
16 | */ |
17 | ||
23721387 | 18 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 19 | #include "main.h" |
23721387 | 20 | |
1e2c2a4f SE |
21 | #include <linux/atomic.h> |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
23721387 | 24 | #include <linux/crc16.h> |
1e2c2a4f SE |
25 | #include <linux/errno.h> |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
23721387 | 28 | #include <linux/if_arp.h> |
1e2c2a4f | 29 | #include <linux/if_ether.h> |
23721387 | 30 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
31 | #include <linux/jhash.h> |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/kernel.h> | |
06e56ded | 34 | #include <linux/kref.h> |
1e2c2a4f SE |
35 | #include <linux/list.h> |
36 | #include <linux/lockdep.h> | |
37 | #include <linux/netdevice.h> | |
04f3f5bf | 38 | #include <linux/netlink.h> |
1e2c2a4f SE |
39 | #include <linux/rculist.h> |
40 | #include <linux/rcupdate.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/spinlock.h> | |
45 | #include <linux/stddef.h> | |
46 | #include <linux/string.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <net/arp.h> | |
04f3f5bf AL |
49 | #include <net/genetlink.h> |
50 | #include <net/netlink.h> | |
51 | #include <net/sock.h> | |
52 | #include <uapi/linux/batman_adv.h> | |
1e2c2a4f SE |
53 | |
54 | #include "hard-interface.h" | |
55 | #include "hash.h" | |
ba412080 | 56 | #include "log.h" |
04f3f5bf | 57 | #include "netlink.h" |
1e2c2a4f SE |
58 | #include "originator.h" |
59 | #include "packet.h" | |
04f3f5bf | 60 | #include "soft-interface.h" |
cd9c7bfb | 61 | #include "sysfs.h" |
1e2c2a4f | 62 | #include "translation-table.h" |
23721387 | 63 | |
6b5e971a | 64 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 65 | |
3b300de3 | 66 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
67 | static void |
68 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
69 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 70 | |
62fe710f | 71 | /** |
04e14be6 SW |
72 | * batadv_choose_claim - choose the right bucket for a claim. |
73 | * @data: data to hash | |
74 | * @size: size of the hash table | |
62fe710f | 75 | * |
04e14be6 | 76 | * Return: the hash index of the claim |
62fe710f | 77 | */ |
6b5e971a | 78 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 79 | { |
712bbfe4 | 80 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 81 | u32 hash = 0; |
23721387 | 82 | |
36fd61cb SE |
83 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
84 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
85 | |
86 | return hash % size; | |
87 | } | |
88 | ||
62fe710f | 89 | /** |
04e14be6 SW |
90 | * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway. |
91 | * @data: data to hash | |
92 | * @size: size of the hash table | |
62fe710f | 93 | * |
04e14be6 | 94 | * Return: the hash index of the backbone gateway |
62fe710f | 95 | */ |
6b5e971a | 96 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 97 | { |
712bbfe4 | 98 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 99 | u32 hash = 0; |
23721387 | 100 | |
36fd61cb SE |
101 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
102 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
103 | |
104 | return hash % size; | |
105 | } | |
106 | ||
04e14be6 SW |
107 | /** |
108 | * batadv_compare_backbone_gw - compare address and vid of two backbone gws | |
109 | * @node: list node of the first entry to compare | |
110 | * @data2: pointer to the second backbone gateway | |
111 | * | |
4b426b10 | 112 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 113 | */ |
4b426b10 SE |
114 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
115 | const void *data2) | |
23721387 | 116 | { |
bae98774 | 117 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 118 | hash_entry); |
4f248cff SE |
119 | const struct batadv_bla_backbone_gw *gw1 = data1; |
120 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 121 | |
c76d1525 | 122 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 123 | return false; |
c76d1525 SW |
124 | |
125 | if (gw1->vid != gw2->vid) | |
4b426b10 | 126 | return false; |
c76d1525 | 127 | |
4b426b10 | 128 | return true; |
23721387 SW |
129 | } |
130 | ||
04e14be6 | 131 | /** |
98a5b1d8 | 132 | * batadv_compare_claim - compare address and vid of two claims |
04e14be6 SW |
133 | * @node: list node of the first entry to compare |
134 | * @data2: pointer to the second claims | |
135 | * | |
4b426b10 | 136 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 137 | */ |
4b426b10 SE |
138 | static bool batadv_compare_claim(const struct hlist_node *node, |
139 | const void *data2) | |
23721387 | 140 | { |
712bbfe4 | 141 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 142 | hash_entry); |
4f248cff SE |
143 | const struct batadv_bla_claim *cl1 = data1; |
144 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
145 | |
146 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 147 | return false; |
c76d1525 SW |
148 | |
149 | if (cl1->vid != cl2->vid) | |
4b426b10 | 150 | return false; |
23721387 | 151 | |
4b426b10 | 152 | return true; |
23721387 SW |
153 | } |
154 | ||
04e14be6 | 155 | /** |
06e56ded SE |
156 | * batadv_backbone_gw_release - release backbone gw from lists and queue for |
157 | * free after rcu grace period | |
158 | * @ref: kref pointer of the backbone gw | |
159 | */ | |
160 | static void batadv_backbone_gw_release(struct kref *ref) | |
161 | { | |
162 | struct batadv_bla_backbone_gw *backbone_gw; | |
163 | ||
164 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
165 | refcount); | |
166 | ||
167 | kfree_rcu(backbone_gw, rcu); | |
168 | } | |
169 | ||
170 | /** | |
c8b86c12 SE |
171 | * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly |
172 | * release it | |
04e14be6 SW |
173 | * @backbone_gw: backbone gateway to be free'd |
174 | */ | |
c8b86c12 | 175 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 176 | { |
06e56ded | 177 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
178 | } |
179 | ||
04e14be6 SW |
180 | /** |
181 | * batadv_claim_release - release claim from lists and queue for free after rcu | |
182 | * grace period | |
183 | * @ref: kref pointer of the claim | |
184 | */ | |
71b7e3d3 | 185 | static void batadv_claim_release(struct kref *ref) |
23721387 | 186 | { |
71b7e3d3 | 187 | struct batadv_bla_claim *claim; |
3db0decf | 188 | struct batadv_bla_backbone_gw *old_backbone_gw; |
71b7e3d3 SE |
189 | |
190 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
191 | ||
3db0decf SE |
192 | spin_lock_bh(&claim->backbone_lock); |
193 | old_backbone_gw = claim->backbone_gw; | |
194 | claim->backbone_gw = NULL; | |
195 | spin_unlock_bh(&claim->backbone_lock); | |
196 | ||
197 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
198 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
199 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
200 | ||
201 | batadv_backbone_gw_put(old_backbone_gw); | |
202 | ||
63b39927 | 203 | kfree_rcu(claim, rcu); |
23721387 SW |
204 | } |
205 | ||
04e14be6 | 206 | /** |
321e3e08 | 207 | * batadv_claim_put - decrement the claim refcounter and possibly |
ec9b83ca | 208 | * release it |
04e14be6 SW |
209 | * @claim: claim to be free'd |
210 | */ | |
321e3e08 | 211 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
23721387 | 212 | { |
71b7e3d3 | 213 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
214 | } |
215 | ||
1b371d13 | 216 | /** |
04e14be6 | 217 | * batadv_claim_hash_find - looks for a claim in the claim hash |
1b371d13 | 218 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
219 | * @data: search data (may be local/static data) |
220 | * | |
62fe710f | 221 | * Return: claim if found or NULL otherwise. |
23721387 | 222 | */ |
6fc77a54 SE |
223 | static struct batadv_bla_claim * |
224 | batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
225 | struct batadv_bla_claim *data) | |
23721387 | 226 | { |
807736f6 | 227 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 228 | struct hlist_head *head; |
712bbfe4 ML |
229 | struct batadv_bla_claim *claim; |
230 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
231 | int index; |
232 | ||
233 | if (!hash) | |
234 | return NULL; | |
235 | ||
3b300de3 | 236 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
237 | head = &hash->table[index]; |
238 | ||
239 | rcu_read_lock(); | |
b67bfe0d | 240 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 241 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
242 | continue; |
243 | ||
71b7e3d3 | 244 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
245 | continue; |
246 | ||
247 | claim_tmp = claim; | |
248 | break; | |
249 | } | |
250 | rcu_read_unlock(); | |
251 | ||
252 | return claim_tmp; | |
253 | } | |
254 | ||
2c53040f | 255 | /** |
04e14be6 | 256 | * batadv_backbone_hash_find - looks for a backbone gateway in the hash |
2c53040f | 257 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
258 | * @addr: the address of the originator |
259 | * @vid: the VLAN ID | |
260 | * | |
04e14be6 | 261 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 262 | */ |
bae98774 | 263 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
264 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
265 | unsigned short vid) | |
23721387 | 266 | { |
807736f6 | 267 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 268 | struct hlist_head *head; |
bae98774 ML |
269 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
270 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
271 | int index; |
272 | ||
273 | if (!hash) | |
274 | return NULL; | |
275 | ||
8fdd0153 | 276 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
277 | search_entry.vid = vid; |
278 | ||
3b300de3 | 279 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
280 | head = &hash->table[index]; |
281 | ||
282 | rcu_read_lock(); | |
b67bfe0d | 283 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
284 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
285 | &search_entry)) | |
23721387 SW |
286 | continue; |
287 | ||
06e56ded | 288 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
289 | continue; |
290 | ||
291 | backbone_gw_tmp = backbone_gw; | |
292 | break; | |
293 | } | |
294 | rcu_read_unlock(); | |
295 | ||
296 | return backbone_gw_tmp; | |
297 | } | |
298 | ||
04e14be6 SW |
299 | /** |
300 | * batadv_bla_del_backbone_claims - delete all claims for a backbone | |
301 | * @backbone_gw: backbone gateway where the claims should be removed | |
302 | */ | |
56303d34 | 303 | static void |
bae98774 | 304 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 305 | { |
5bf74e9c | 306 | struct batadv_hashtable *hash; |
b67bfe0d | 307 | struct hlist_node *node_tmp; |
23721387 | 308 | struct hlist_head *head; |
712bbfe4 | 309 | struct batadv_bla_claim *claim; |
23721387 SW |
310 | int i; |
311 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
312 | ||
807736f6 | 313 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
314 | if (!hash) |
315 | return; | |
316 | ||
317 | for (i = 0; i < hash->size; i++) { | |
318 | head = &hash->table[i]; | |
319 | list_lock = &hash->list_locks[i]; | |
320 | ||
321 | spin_lock_bh(list_lock); | |
b67bfe0d | 322 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 323 | head, hash_entry) { |
23721387 SW |
324 | if (claim->backbone_gw != backbone_gw) |
325 | continue; | |
326 | ||
321e3e08 | 327 | batadv_claim_put(claim); |
b67bfe0d | 328 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
329 | } |
330 | spin_unlock_bh(list_lock); | |
331 | } | |
332 | ||
3f68785e | 333 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 334 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 335 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 336 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
337 | } |
338 | ||
2c53040f BH |
339 | /** |
340 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
341 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 342 | * @mac: the mac address to be announced within the claim |
23721387 SW |
343 | * @vid: the VLAN ID |
344 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 345 | */ |
6b5e971a | 346 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 347 | unsigned short vid, int claimtype) |
23721387 SW |
348 | { |
349 | struct sk_buff *skb; | |
350 | struct ethhdr *ethhdr; | |
56303d34 | 351 | struct batadv_hard_iface *primary_if; |
23721387 | 352 | struct net_device *soft_iface; |
6b5e971a | 353 | u8 *hw_src; |
96412690 | 354 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 355 | __be32 zeroip = 0; |
23721387 | 356 | |
e5d89254 | 357 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
358 | if (!primary_if) |
359 | return; | |
360 | ||
807736f6 | 361 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 362 | sizeof(local_claim_dest)); |
23721387 SW |
363 | local_claim_dest.type = claimtype; |
364 | ||
365 | soft_iface = primary_if->soft_iface; | |
366 | ||
367 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
368 | /* IP DST: 0.0.0.0 */ | |
369 | zeroip, | |
370 | primary_if->soft_iface, | |
371 | /* IP SRC: 0.0.0.0 */ | |
372 | zeroip, | |
373 | /* Ethernet DST: Broadcast */ | |
374 | NULL, | |
375 | /* Ethernet SRC/HW SRC: originator mac */ | |
376 | primary_if->net_dev->dev_addr, | |
99e966fc | 377 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 378 | * with XX = claim type |
38ef3d1d | 379 | * and YY:YY = group id |
23721387 | 380 | */ |
6b5e971a | 381 | (u8 *)&local_claim_dest); |
23721387 SW |
382 | |
383 | if (!skb) | |
384 | goto out; | |
385 | ||
386 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 387 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
388 | |
389 | /* now we pretend that the client would have sent this ... */ | |
390 | switch (claimtype) { | |
3eb8773e | 391 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
392 | /* normal claim frame |
393 | * set Ethernet SRC to the clients mac | |
394 | */ | |
8fdd0153 | 395 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 396 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
397 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
398 | BATADV_PRINT_VID(vid)); | |
23721387 | 399 | break; |
3eb8773e | 400 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
401 | /* unclaim frame |
402 | * set HW SRC to the clients mac | |
403 | */ | |
8fdd0153 | 404 | ether_addr_copy(hw_src, mac); |
39c75a51 | 405 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 406 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 407 | BATADV_PRINT_VID(vid)); |
23721387 | 408 | break; |
acd34afa | 409 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
410 | /* announcement frame |
411 | * set HW SRC to the special mac containg the crc | |
412 | */ | |
8fdd0153 | 413 | ether_addr_copy(hw_src, mac); |
39c75a51 | 414 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 415 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 416 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 417 | break; |
acd34afa | 418 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 419 | /* request frame |
99e966fc SW |
420 | * set HW SRC and header destination to the receiving backbone |
421 | * gws mac | |
23721387 | 422 | */ |
8fdd0153 AQ |
423 | ether_addr_copy(hw_src, mac); |
424 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 425 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 426 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
427 | ethhdr->h_source, ethhdr->h_dest, |
428 | BATADV_PRINT_VID(vid)); | |
23721387 | 429 | break; |
cd9c7bfb SW |
430 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
431 | ether_addr_copy(ethhdr->h_source, mac); | |
432 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
433 | "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n", | |
434 | ethhdr->h_source, ethhdr->h_dest, | |
435 | BATADV_PRINT_VID(vid)); | |
436 | ||
437 | break; | |
23721387 SW |
438 | } |
439 | ||
10c78f58 | 440 | if (vid & BATADV_VLAN_HAS_TAG) { |
eb2deb6b AQ |
441 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
442 | vid & VLAN_VID_MASK); | |
10c78f58 SE |
443 | if (!skb) |
444 | goto out; | |
445 | } | |
23721387 SW |
446 | |
447 | skb_reset_mac_header(skb); | |
448 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
449 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
450 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
451 | skb->len + ETH_HLEN); | |
23721387 SW |
452 | soft_iface->last_rx = jiffies; |
453 | ||
454 | netif_rx(skb); | |
455 | out: | |
456 | if (primary_if) | |
82047ad7 | 457 | batadv_hardif_put(primary_if); |
23721387 SW |
458 | } |
459 | ||
cd9c7bfb SW |
460 | /** |
461 | * batadv_bla_loopdetect_report - worker for reporting the loop | |
462 | * @work: work queue item | |
463 | * | |
464 | * Throws an uevent, as the loopdetect check function can't do that itself | |
465 | * since the kernel may sleep while throwing uevents. | |
466 | */ | |
467 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
468 | { | |
469 | struct batadv_bla_backbone_gw *backbone_gw; | |
470 | struct batadv_priv *bat_priv; | |
471 | char vid_str[6] = { '\0' }; | |
472 | ||
473 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
474 | report_work); | |
475 | bat_priv = backbone_gw->bat_priv; | |
476 | ||
477 | batadv_info(bat_priv->soft_iface, | |
478 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
479 | BATADV_PRINT_VID(backbone_gw->vid)); | |
480 | snprintf(vid_str, sizeof(vid_str), "%d", | |
481 | BATADV_PRINT_VID(backbone_gw->vid)); | |
482 | vid_str[sizeof(vid_str) - 1] = 0; | |
483 | ||
484 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
485 | vid_str); | |
486 | ||
487 | batadv_backbone_gw_put(backbone_gw); | |
488 | } | |
489 | ||
2c53040f | 490 | /** |
04e14be6 | 491 | * batadv_bla_get_backbone_gw - finds or creates a backbone gateway |
2c53040f | 492 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
493 | * @orig: the mac address of the originator |
494 | * @vid: the VLAN ID | |
e3357189 | 495 | * @own_backbone: set if the requested backbone is local |
23721387 | 496 | * |
04e14be6 | 497 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 498 | */ |
bae98774 | 499 | static struct batadv_bla_backbone_gw * |
6b5e971a | 500 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 501 | unsigned short vid, bool own_backbone) |
23721387 | 502 | { |
bae98774 | 503 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 504 | struct batadv_orig_node *orig_node; |
23721387 SW |
505 | int hash_added; |
506 | ||
3b300de3 | 507 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
508 | |
509 | if (entry) | |
510 | return entry; | |
511 | ||
39c75a51 | 512 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 513 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 514 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
515 | |
516 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
517 | if (!entry) | |
518 | return NULL; | |
519 | ||
520 | entry->vid = vid; | |
521 | entry->lasttime = jiffies; | |
3964f728 | 522 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 523 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 524 | spin_lock_init(&entry->crc_lock); |
23721387 | 525 | atomic_set(&entry->request_sent, 0); |
28709878 | 526 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 527 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 528 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
06e56ded | 529 | kref_init(&entry->refcount); |
23721387 | 530 | |
4e8389e1 | 531 | kref_get(&entry->refcount); |
807736f6 | 532 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
533 | batadv_compare_backbone_gw, |
534 | batadv_choose_backbone_gw, entry, | |
535 | &entry->hash_entry); | |
23721387 SW |
536 | |
537 | if (unlikely(hash_added != 0)) { | |
538 | /* hash failed, free the structure */ | |
539 | kfree(entry); | |
540 | return NULL; | |
541 | } | |
542 | ||
95fb130d | 543 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 544 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 545 | if (orig_node) { |
95fb130d | 546 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 547 | "became a backbone gateway"); |
5d967310 | 548 | batadv_orig_node_put(orig_node); |
20ff9d59 | 549 | } |
52aebd6a | 550 | |
d807f272 | 551 | if (own_backbone) { |
52aebd6a SW |
552 | batadv_bla_send_announce(bat_priv, entry); |
553 | ||
d807f272 SW |
554 | /* this will be decreased in the worker thread */ |
555 | atomic_inc(&entry->request_sent); | |
28709878 | 556 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
557 | atomic_inc(&bat_priv->bla.num_requests); |
558 | } | |
559 | ||
23721387 SW |
560 | return entry; |
561 | } | |
562 | ||
04e14be6 SW |
563 | /** |
564 | * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN | |
565 | * @bat_priv: the bat priv with all the soft interface information | |
566 | * @primary_if: the selected primary interface | |
567 | * @vid: VLAN identifier | |
568 | * | |
569 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
570 | * where we receive other backbone gws |
571 | */ | |
56303d34 SE |
572 | static void |
573 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
574 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 575 | unsigned short vid) |
23721387 | 576 | { |
bae98774 | 577 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 578 | |
3b300de3 SE |
579 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
580 | primary_if->net_dev->dev_addr, | |
52aebd6a | 581 | vid, true); |
23721387 SW |
582 | if (unlikely(!backbone_gw)) |
583 | return; | |
584 | ||
585 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 586 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
587 | } |
588 | ||
1b371d13 SW |
589 | /** |
590 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
591 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 592 | * @primary_if: interface where the request came on |
23721387 SW |
593 | * @vid: the vid where the request came on |
594 | * | |
595 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
596 | * to allow the requester another check if the CRC is correct now. | |
597 | */ | |
56303d34 SE |
598 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
599 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 600 | unsigned short vid) |
23721387 | 601 | { |
23721387 | 602 | struct hlist_head *head; |
5bf74e9c | 603 | struct batadv_hashtable *hash; |
712bbfe4 | 604 | struct batadv_bla_claim *claim; |
bae98774 | 605 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
606 | int i; |
607 | ||
39c75a51 | 608 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 609 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 610 | |
3b300de3 SE |
611 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
612 | primary_if->net_dev->dev_addr, | |
613 | vid); | |
23721387 SW |
614 | if (!backbone_gw) |
615 | return; | |
616 | ||
807736f6 | 617 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
618 | for (i = 0; i < hash->size; i++) { |
619 | head = &hash->table[i]; | |
620 | ||
621 | rcu_read_lock(); | |
b67bfe0d | 622 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
623 | /* only own claims are interesting */ |
624 | if (claim->backbone_gw != backbone_gw) | |
625 | continue; | |
626 | ||
3b300de3 | 627 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 628 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
629 | } |
630 | rcu_read_unlock(); | |
631 | } | |
632 | ||
633 | /* finally, send an announcement frame */ | |
3b300de3 | 634 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 635 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
636 | } |
637 | ||
1b371d13 SW |
638 | /** |
639 | * batadv_bla_send_request - send a request to repeat claims | |
640 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
641 | * |
642 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
643 | * After the request, it will repeat all of his own claims and finally | |
644 | * send an announcement claim with which we can check again. | |
645 | */ | |
bae98774 | 646 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
647 | { |
648 | /* first, remove all old entries */ | |
3b300de3 | 649 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 650 | |
39c75a51 SE |
651 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
652 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
653 | |
654 | /* send request */ | |
3b300de3 | 655 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 656 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
657 | |
658 | /* no local broadcasts should be sent or received, for now. */ | |
659 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 660 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
661 | atomic_set(&backbone_gw->request_sent, 1); |
662 | } | |
663 | } | |
664 | ||
1b371d13 | 665 | /** |
04e14be6 | 666 | * batadv_bla_send_announce - Send an announcement frame |
1b371d13 | 667 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 668 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 669 | */ |
56303d34 | 670 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 671 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 672 | { |
6b5e971a | 673 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 674 | __be16 crc; |
23721387 | 675 | |
3b300de3 | 676 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 677 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 678 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 679 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 680 | memcpy(&mac[4], &crc, 2); |
23721387 | 681 | |
3b300de3 | 682 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 683 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
684 | } |
685 | ||
2c53040f BH |
686 | /** |
687 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
688 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
689 | * @mac: the mac address of the claim |
690 | * @vid: the VLAN ID of the frame | |
691 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 692 | */ |
56303d34 | 693 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 694 | const u8 *mac, const unsigned short vid, |
bae98774 | 695 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 696 | { |
3db0decf | 697 | struct batadv_bla_backbone_gw *old_backbone_gw; |
712bbfe4 ML |
698 | struct batadv_bla_claim *claim; |
699 | struct batadv_bla_claim search_claim; | |
3db0decf | 700 | bool remove_crc = false; |
23721387 SW |
701 | int hash_added; |
702 | ||
8fdd0153 | 703 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 704 | search_claim.vid = vid; |
3b300de3 | 705 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
706 | |
707 | /* create a new claim entry if it does not exist yet. */ | |
708 | if (!claim) { | |
709 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
710 | if (!claim) | |
711 | return; | |
712 | ||
8fdd0153 | 713 | ether_addr_copy(claim->addr, mac); |
3db0decf | 714 | spin_lock_init(&claim->backbone_lock); |
23721387 SW |
715 | claim->vid = vid; |
716 | claim->lasttime = jiffies; | |
3db0decf | 717 | kref_get(&backbone_gw->refcount); |
23721387 | 718 | claim->backbone_gw = backbone_gw; |
71b7e3d3 | 719 | kref_init(&claim->refcount); |
7282ac39 | 720 | |
39c75a51 | 721 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 722 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 723 | mac, BATADV_PRINT_VID(vid)); |
7282ac39 SE |
724 | |
725 | kref_get(&claim->refcount); | |
807736f6 | 726 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
727 | batadv_compare_claim, |
728 | batadv_choose_claim, claim, | |
729 | &claim->hash_entry); | |
23721387 SW |
730 | |
731 | if (unlikely(hash_added != 0)) { | |
732 | /* only local changes happened. */ | |
733 | kfree(claim); | |
734 | return; | |
735 | } | |
736 | } else { | |
737 | claim->lasttime = jiffies; | |
738 | if (claim->backbone_gw == backbone_gw) | |
739 | /* no need to register a new backbone */ | |
740 | goto claim_free_ref; | |
741 | ||
39c75a51 | 742 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 743 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 744 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 745 | |
3db0decf | 746 | remove_crc = true; |
23721387 | 747 | } |
3db0decf SE |
748 | |
749 | /* replace backbone_gw atomically and adjust reference counters */ | |
750 | spin_lock_bh(&claim->backbone_lock); | |
751 | old_backbone_gw = claim->backbone_gw; | |
06e56ded | 752 | kref_get(&backbone_gw->refcount); |
23721387 | 753 | claim->backbone_gw = backbone_gw; |
3db0decf | 754 | spin_unlock_bh(&claim->backbone_lock); |
23721387 | 755 | |
3db0decf SE |
756 | if (remove_crc) { |
757 | /* remove claim address from old backbone_gw */ | |
758 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
759 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
760 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
761 | } | |
23721387 | 762 | |
3db0decf SE |
763 | batadv_backbone_gw_put(old_backbone_gw); |
764 | ||
765 | /* add claim address to new backbone_gw */ | |
5a1dd8a4 | 766 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 767 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 768 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
769 | backbone_gw->lasttime = jiffies; |
770 | ||
771 | claim_free_ref: | |
321e3e08 | 772 | batadv_claim_put(claim); |
23721387 SW |
773 | } |
774 | ||
3db0decf SE |
775 | /** |
776 | * batadv_bla_claim_get_backbone_gw - Get valid reference for backbone_gw of | |
777 | * claim | |
778 | * @claim: claim whose backbone_gw should be returned | |
779 | * | |
780 | * Return: valid reference to claim::backbone_gw | |
781 | */ | |
782 | static struct batadv_bla_backbone_gw * | |
783 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) | |
784 | { | |
785 | struct batadv_bla_backbone_gw *backbone_gw; | |
786 | ||
787 | spin_lock_bh(&claim->backbone_lock); | |
788 | backbone_gw = claim->backbone_gw; | |
789 | kref_get(&backbone_gw->refcount); | |
790 | spin_unlock_bh(&claim->backbone_lock); | |
791 | ||
792 | return backbone_gw; | |
793 | } | |
794 | ||
04e14be6 SW |
795 | /** |
796 | * batadv_bla_del_claim - delete a claim from the claim hash | |
797 | * @bat_priv: the bat priv with all the soft interface information | |
798 | * @mac: mac address of the claim to be removed | |
799 | * @vid: VLAN id for the claim to be removed | |
23721387 | 800 | */ |
56303d34 | 801 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 802 | const u8 *mac, const unsigned short vid) |
23721387 | 803 | { |
712bbfe4 | 804 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 805 | |
8fdd0153 | 806 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 807 | search_claim.vid = vid; |
3b300de3 | 808 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
809 | if (!claim) |
810 | return; | |
811 | ||
39c75a51 | 812 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 813 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 814 | |
807736f6 | 815 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 | 816 | batadv_choose_claim, claim); |
321e3e08 | 817 | batadv_claim_put(claim); /* reference from the hash is gone */ |
23721387 | 818 | |
23721387 | 819 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 820 | batadv_claim_put(claim); |
23721387 SW |
821 | } |
822 | ||
62fe710f SE |
823 | /** |
824 | * batadv_handle_announce - check for ANNOUNCE frame | |
04e14be6 SW |
825 | * @bat_priv: the bat priv with all the soft interface information |
826 | * @an_addr: announcement mac address (ARP Sender HW address) | |
827 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
828 | * @vid: the VLAN ID of the frame | |
62fe710f | 829 | * |
4b426b10 | 830 | * Return: true if handled |
62fe710f | 831 | */ |
4b426b10 SE |
832 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
833 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 834 | { |
bae98774 | 835 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 836 | u16 backbone_crc, crc; |
23721387 | 837 | |
3b300de3 | 838 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 839 | return false; |
23721387 | 840 | |
52aebd6a SW |
841 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
842 | false); | |
23721387 SW |
843 | |
844 | if (unlikely(!backbone_gw)) | |
4b426b10 | 845 | return true; |
23721387 | 846 | |
23721387 SW |
847 | /* handle as ANNOUNCE frame */ |
848 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 849 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 850 | |
39c75a51 | 851 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 852 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 853 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 854 | |
5a1dd8a4 SW |
855 | spin_lock_bh(&backbone_gw->crc_lock); |
856 | backbone_crc = backbone_gw->crc; | |
857 | spin_unlock_bh(&backbone_gw->crc_lock); | |
858 | ||
859 | if (backbone_crc != crc) { | |
39c75a51 | 860 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 861 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
862 | backbone_gw->orig, |
863 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 864 | backbone_crc, crc); |
23721387 | 865 | |
3b300de3 | 866 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
867 | } else { |
868 | /* if we have sent a request and the crc was OK, | |
869 | * we can allow traffic again. | |
870 | */ | |
871 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 872 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
873 | atomic_set(&backbone_gw->request_sent, 0); |
874 | } | |
875 | } | |
876 | ||
c8b86c12 | 877 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 878 | return true; |
23721387 SW |
879 | } |
880 | ||
62fe710f SE |
881 | /** |
882 | * batadv_handle_request - check for REQUEST frame | |
04e14be6 SW |
883 | * @bat_priv: the bat priv with all the soft interface information |
884 | * @primary_if: the primary hard interface of this batman soft interface | |
885 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
886 | * @ethhdr: ethernet header of a packet | |
887 | * @vid: the VLAN ID of the frame | |
62fe710f | 888 | * |
4b426b10 | 889 | * Return: true if handled |
62fe710f | 890 | */ |
4b426b10 SE |
891 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
892 | struct batadv_hard_iface *primary_if, | |
893 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
894 | unsigned short vid) | |
23721387 SW |
895 | { |
896 | /* check for REQUEST frame */ | |
1eda58bf | 897 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 898 | return false; |
23721387 SW |
899 | |
900 | /* sanity check, this should not happen on a normal switch, | |
901 | * we ignore it in this case. | |
902 | */ | |
1eda58bf | 903 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 904 | return true; |
23721387 | 905 | |
39c75a51 | 906 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 907 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 908 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 909 | |
3b300de3 | 910 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 911 | return true; |
23721387 SW |
912 | } |
913 | ||
62fe710f SE |
914 | /** |
915 | * batadv_handle_unclaim - check for UNCLAIM frame | |
04e14be6 SW |
916 | * @bat_priv: the bat priv with all the soft interface information |
917 | * @primary_if: the primary hard interface of this batman soft interface | |
918 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
919 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
920 | * @vid: the VLAN ID of the frame | |
62fe710f | 921 | * |
4b426b10 | 922 | * Return: true if handled |
62fe710f | 923 | */ |
4b426b10 SE |
924 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
925 | struct batadv_hard_iface *primary_if, | |
926 | u8 *backbone_addr, u8 *claim_addr, | |
927 | unsigned short vid) | |
23721387 | 928 | { |
bae98774 | 929 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
930 | |
931 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
932 | if (primary_if && batadv_compare_eth(backbone_addr, |
933 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 934 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 935 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 936 | |
3b300de3 | 937 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
938 | |
939 | if (!backbone_gw) | |
4b426b10 | 940 | return true; |
23721387 SW |
941 | |
942 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 943 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 944 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 945 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 946 | |
3b300de3 | 947 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 948 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 949 | return true; |
23721387 SW |
950 | } |
951 | ||
62fe710f SE |
952 | /** |
953 | * batadv_handle_claim - check for CLAIM frame | |
04e14be6 SW |
954 | * @bat_priv: the bat priv with all the soft interface information |
955 | * @primary_if: the primary hard interface of this batman soft interface | |
956 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
957 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
958 | * @vid: the VLAN ID of the frame | |
62fe710f | 959 | * |
4b426b10 | 960 | * Return: true if handled |
62fe710f | 961 | */ |
4b426b10 SE |
962 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
963 | struct batadv_hard_iface *primary_if, | |
964 | u8 *backbone_addr, u8 *claim_addr, | |
965 | unsigned short vid) | |
23721387 | 966 | { |
bae98774 | 967 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
968 | |
969 | /* register the gateway if not yet available, and add the claim. */ | |
970 | ||
52aebd6a SW |
971 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
972 | false); | |
23721387 SW |
973 | |
974 | if (unlikely(!backbone_gw)) | |
4b426b10 | 975 | return true; |
23721387 SW |
976 | |
977 | /* this must be a CLAIM frame */ | |
3b300de3 | 978 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 979 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 980 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 981 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
982 | |
983 | /* TODO: we could call something like tt_local_del() here. */ | |
984 | ||
c8b86c12 | 985 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 986 | return true; |
23721387 SW |
987 | } |
988 | ||
2c53040f | 989 | /** |
04e14be6 | 990 | * batadv_check_claim_group - check for claim group membership |
2c53040f | 991 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 992 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
993 | * @hw_src: the Hardware source in the ARP Header |
994 | * @hw_dst: the Hardware destination in the ARP Header | |
995 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
996 | * | |
997 | * checks if it is a claim packet and if its on the same group. | |
998 | * This function also applies the group ID of the sender | |
999 | * if it is in the same mesh. | |
1000 | * | |
62fe710f | 1001 | * Return: |
38ef3d1d SW |
1002 | * 2 - if it is a claim packet and on the same group |
1003 | * 1 - if is a claim packet from another group | |
1004 | * 0 - if it is not a claim packet | |
1005 | */ | |
56303d34 SE |
1006 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1007 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1008 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1009 | struct ethhdr *ethhdr) |
38ef3d1d | 1010 | { |
6b5e971a | 1011 | u8 *backbone_addr; |
56303d34 | 1012 | struct batadv_orig_node *orig_node; |
96412690 | 1013 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1014 | |
96412690 | 1015 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1016 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1017 | |
38ef3d1d SW |
1018 | /* if announcement packet, use the source, |
1019 | * otherwise assume it is in the hw_src | |
1020 | */ | |
1021 | switch (bla_dst->type) { | |
3eb8773e | 1022 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1023 | backbone_addr = hw_src; |
1024 | break; | |
acd34afa SE |
1025 | case BATADV_CLAIM_TYPE_REQUEST: |
1026 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1027 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1028 | backbone_addr = ethhdr->h_source; |
1029 | break; | |
1030 | default: | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1035 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1036 | return 0; |
1037 | ||
1038 | /* if its already the same group, it is fine. */ | |
1039 | if (bla_dst->group == bla_dst_own->group) | |
1040 | return 2; | |
1041 | ||
1042 | /* lets see if this originator is in our mesh */ | |
da641193 | 1043 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
1044 | |
1045 | /* dont accept claims from gateways which are not in | |
1046 | * the same mesh or group. | |
1047 | */ | |
1048 | if (!orig_node) | |
1049 | return 1; | |
1050 | ||
1051 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1052 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1053 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1054 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1055 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1056 | bla_dst_own->group = bla_dst->group; |
1057 | } | |
1058 | ||
5d967310 | 1059 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1060 | |
1061 | return 2; | |
1062 | } | |
1063 | ||
1b371d13 | 1064 | /** |
04e14be6 | 1065 | * batadv_bla_process_claim - Check if this is a claim frame, and process it |
1b371d13 | 1066 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1067 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1068 | * @skb: the frame to be checked |
1069 | * | |
4b426b10 | 1070 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1071 | * tell the callee that it can use the frame on its own. |
1072 | */ | |
4b426b10 SE |
1073 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1074 | struct batadv_hard_iface *primary_if, | |
1075 | struct sk_buff *skb) | |
23721387 | 1076 | { |
d46b6bfa | 1077 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1078 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1079 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1080 | struct ethhdr *ethhdr; |
23721387 | 1081 | struct arphdr *arphdr; |
c018ad3d | 1082 | unsigned short vid; |
d46b6bfa | 1083 | int vlan_depth = 0; |
293e9338 | 1084 | __be16 proto; |
23721387 | 1085 | int headlen; |
38ef3d1d | 1086 | int ret; |
23721387 | 1087 | |
c018ad3d | 1088 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1089 | ethhdr = eth_hdr(skb); |
23721387 | 1090 | |
c018ad3d AQ |
1091 | proto = ethhdr->h_proto; |
1092 | headlen = ETH_HLEN; | |
1093 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1094 | /* Traverse the VLAN/Ethertypes. |
1095 | * | |
1096 | * At this point it is known that the first protocol is a VLAN | |
1097 | * header, so start checking at the encapsulated protocol. | |
1098 | * | |
1099 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1100 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1101 | */ | |
1102 | do { | |
1103 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1104 | &vhdr_buf); | |
1105 | if (!vhdr) | |
4b426b10 | 1106 | return false; |
d46b6bfa SW |
1107 | |
1108 | proto = vhdr->h_vlan_encapsulated_proto; | |
1109 | headlen += VLAN_HLEN; | |
1110 | vlan_depth++; | |
1111 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1112 | } |
1113 | ||
293e9338 | 1114 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1115 | return false; /* not a claim frame */ |
23721387 SW |
1116 | |
1117 | /* this must be a ARP frame. check if it is a claim. */ | |
1118 | ||
1119 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1120 | return false; |
23721387 SW |
1121 | |
1122 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1123 | ethhdr = eth_hdr(skb); |
6b5e971a | 1124 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1125 | |
1126 | /* Check whether the ARP frame carries a valid | |
1127 | * IP information | |
1128 | */ | |
23721387 | 1129 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1130 | return false; |
23721387 | 1131 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1132 | return false; |
23721387 | 1133 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1134 | return false; |
23721387 | 1135 | if (arphdr->ar_pln != 4) |
4b426b10 | 1136 | return false; |
23721387 | 1137 | |
6b5e971a | 1138 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1139 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1140 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1141 | bla_dst_own = &bat_priv->bla.claim_dest; |
1142 | ||
1143 | /* check if it is a claim frame in general */ | |
1144 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1145 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1146 | return false; |
d46b6bfa SW |
1147 | |
1148 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1149 | * drop that, as this is not supported by BLA but should also not be | |
1150 | * sent via the mesh. | |
1151 | */ | |
1152 | if (vlan_depth > 1) | |
4b426b10 | 1153 | return true; |
23721387 | 1154 | |
cd9c7bfb SW |
1155 | /* Let the loopdetect frames on the mesh in any case. */ |
1156 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1157 | return false; |
cd9c7bfb | 1158 | |
23721387 | 1159 | /* check if it is a claim frame. */ |
3b300de3 SE |
1160 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1161 | ethhdr); | |
38ef3d1d | 1162 | if (ret == 1) |
39c75a51 | 1163 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1164 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
1165 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
1166 | hw_dst); | |
38ef3d1d SW |
1167 | |
1168 | if (ret < 2) | |
4b426b10 | 1169 | return !!ret; |
23721387 SW |
1170 | |
1171 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1172 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1173 | |
1174 | /* check for the different types of claim frames ... */ | |
1175 | switch (bla_dst->type) { | |
3eb8773e | 1176 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1177 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1178 | ethhdr->h_source, vid)) | |
4b426b10 | 1179 | return true; |
23721387 | 1180 | break; |
3eb8773e | 1181 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1182 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1183 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1184 | return true; |
23721387 SW |
1185 | break; |
1186 | ||
acd34afa | 1187 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1188 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1189 | vid)) | |
4b426b10 | 1190 | return true; |
23721387 | 1191 | break; |
acd34afa | 1192 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1193 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1194 | vid)) | |
4b426b10 | 1195 | return true; |
23721387 SW |
1196 | break; |
1197 | } | |
1198 | ||
39c75a51 | 1199 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1200 | "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 | 1201 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
4b426b10 | 1202 | return true; |
23721387 SW |
1203 | } |
1204 | ||
04e14be6 SW |
1205 | /** |
1206 | * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or | |
1207 | * immediately | |
1208 | * @bat_priv: the bat priv with all the soft interface information | |
1209 | * @now: whether the whole hash shall be wiped now | |
1210 | * | |
1211 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1212 | * a time out, or clean all backbone gws if now is set. |
1213 | */ | |
56303d34 | 1214 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1215 | { |
bae98774 | 1216 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1217 | struct hlist_node *node_tmp; |
23721387 | 1218 | struct hlist_head *head; |
5bf74e9c | 1219 | struct batadv_hashtable *hash; |
23721387 SW |
1220 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1221 | int i; | |
1222 | ||
807736f6 | 1223 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1224 | if (!hash) |
1225 | return; | |
1226 | ||
1227 | for (i = 0; i < hash->size; i++) { | |
1228 | head = &hash->table[i]; | |
1229 | list_lock = &hash->list_locks[i]; | |
1230 | ||
1231 | spin_lock_bh(list_lock); | |
b67bfe0d | 1232 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1233 | head, hash_entry) { |
1234 | if (now) | |
1235 | goto purge_now; | |
1eda58bf | 1236 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1237 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1238 | continue; |
1239 | ||
39c75a51 | 1240 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1241 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1242 | backbone_gw->orig); | |
23721387 SW |
1243 | |
1244 | purge_now: | |
1245 | /* don't wait for the pending request anymore */ | |
1246 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1247 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1248 | |
3b300de3 | 1249 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1250 | |
b67bfe0d | 1251 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1252 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1253 | } |
1254 | spin_unlock_bh(list_lock); | |
1255 | } | |
1256 | } | |
1257 | ||
2c53040f | 1258 | /** |
04e14be6 | 1259 | * batadv_bla_purge_claims - Remove claims after a timeout or immediately |
2c53040f | 1260 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1261 | * @primary_if: the selected primary interface, may be NULL if now is set |
1262 | * @now: whether the whole hash shall be wiped now | |
1263 | * | |
1264 | * Check when we heard last time from our own claims, and remove them in case of | |
1265 | * a time out, or clean all claims if now is set | |
1266 | */ | |
56303d34 SE |
1267 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1268 | struct batadv_hard_iface *primary_if, | |
1269 | int now) | |
23721387 | 1270 | { |
3db0decf | 1271 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1272 | struct batadv_bla_claim *claim; |
23721387 | 1273 | struct hlist_head *head; |
5bf74e9c | 1274 | struct batadv_hashtable *hash; |
23721387 SW |
1275 | int i; |
1276 | ||
807736f6 | 1277 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1278 | if (!hash) |
1279 | return; | |
1280 | ||
1281 | for (i = 0; i < hash->size; i++) { | |
1282 | head = &hash->table[i]; | |
1283 | ||
1284 | rcu_read_lock(); | |
b67bfe0d | 1285 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1286 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1287 | if (now) |
1288 | goto purge_now; | |
3db0decf SE |
1289 | |
1290 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1291 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1292 | goto skip; |
1293 | ||
1eda58bf | 1294 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1295 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1296 | goto skip; |
23721387 | 1297 | |
39c75a51 | 1298 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1299 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1300 | claim->addr, claim->vid); | |
23721387 SW |
1301 | |
1302 | purge_now: | |
3b300de3 | 1303 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1304 | backbone_gw->orig, |
3b300de3 | 1305 | claim->addr, claim->vid); |
3db0decf SE |
1306 | skip: |
1307 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1308 | } |
1309 | rcu_read_unlock(); | |
1310 | } | |
1311 | } | |
1312 | ||
2c53040f | 1313 | /** |
04e14be6 SW |
1314 | * batadv_bla_update_orig_address - Update the backbone gateways when the own |
1315 | * originator address changes | |
2c53040f | 1316 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1317 | * @primary_if: the new selected primary_if |
1318 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1319 | */ |
56303d34 SE |
1320 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1321 | struct batadv_hard_iface *primary_if, | |
1322 | struct batadv_hard_iface *oldif) | |
23721387 | 1323 | { |
bae98774 | 1324 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1325 | struct hlist_head *head; |
5bf74e9c | 1326 | struct batadv_hashtable *hash; |
807736f6 | 1327 | __be16 group; |
23721387 SW |
1328 | int i; |
1329 | ||
38ef3d1d | 1330 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1331 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1332 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1333 | |
d5b4c93e SW |
1334 | /* purge everything when bridge loop avoidance is turned off */ |
1335 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1336 | oldif = NULL; | |
1337 | ||
23721387 | 1338 | if (!oldif) { |
3b300de3 SE |
1339 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1340 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1341 | return; |
1342 | } | |
1343 | ||
807736f6 | 1344 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1345 | if (!hash) |
1346 | return; | |
1347 | ||
1348 | for (i = 0; i < hash->size; i++) { | |
1349 | head = &hash->table[i]; | |
1350 | ||
1351 | rcu_read_lock(); | |
b67bfe0d | 1352 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1353 | /* own orig still holds the old value. */ |
1eda58bf SE |
1354 | if (!batadv_compare_eth(backbone_gw->orig, |
1355 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1356 | continue; |
1357 | ||
8fdd0153 AQ |
1358 | ether_addr_copy(backbone_gw->orig, |
1359 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1360 | /* send an announce frame so others will ask for our |
1361 | * claims and update their tables. | |
1362 | */ | |
3b300de3 | 1363 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1364 | } |
1365 | rcu_read_unlock(); | |
1366 | } | |
1367 | } | |
1368 | ||
cd9c7bfb SW |
1369 | /** |
1370 | * batadv_bla_send_loopdetect - send a loopdetect frame | |
1371 | * @bat_priv: the bat priv with all the soft interface information | |
1372 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1373 | * | |
1374 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1375 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1376 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1377 | * indicates that there is a loop. | |
1378 | */ | |
1379 | static void | |
1380 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1381 | struct batadv_bla_backbone_gw *backbone_gw) | |
1382 | { | |
1383 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1384 | backbone_gw->vid); | |
1385 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1386 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1387 | } | |
1388 | ||
d68081a2 SW |
1389 | /** |
1390 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1391 | * @net_dev: the soft interface net device | |
1392 | */ | |
1393 | void batadv_bla_status_update(struct net_device *net_dev) | |
1394 | { | |
1395 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1396 | struct batadv_hard_iface *primary_if; | |
1397 | ||
1398 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1399 | if (!primary_if) | |
1400 | return; | |
1401 | ||
1402 | /* this function already purges everything when bla is disabled, | |
1403 | * so just call that one. | |
1404 | */ | |
1405 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1406 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1407 | } |
1408 | ||
04e14be6 SW |
1409 | /** |
1410 | * batadv_bla_periodic_work - performs periodic bla work | |
1411 | * @work: kernel work struct | |
1412 | * | |
1413 | * periodic work to do: | |
23721387 SW |
1414 | * * purge structures when they are too old |
1415 | * * send announcements | |
1416 | */ | |
3b300de3 | 1417 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1418 | { |
bbb1f90e | 1419 | struct delayed_work *delayed_work; |
56303d34 | 1420 | struct batadv_priv *bat_priv; |
807736f6 | 1421 | struct batadv_priv_bla *priv_bla; |
23721387 | 1422 | struct hlist_head *head; |
bae98774 | 1423 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1424 | struct batadv_hashtable *hash; |
56303d34 | 1425 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1426 | bool send_loopdetect = false; |
23721387 SW |
1427 | int i; |
1428 | ||
4ba4bc0f | 1429 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1430 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1431 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1432 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1433 | if (!primary_if) |
1434 | goto out; | |
1435 | ||
3b300de3 SE |
1436 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1437 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1438 | |
1439 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1440 | goto out; | |
1441 | ||
cd9c7bfb SW |
1442 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1443 | /* set a new random mac address for the next bridge loop | |
1444 | * detection frames. Set the locally administered bit to avoid | |
1445 | * collisions with users mac addresses. | |
1446 | */ | |
1447 | random_ether_addr(bat_priv->bla.loopdetect_addr); | |
1448 | bat_priv->bla.loopdetect_addr[0] = 0xba; | |
1449 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1450 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1451 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1452 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1453 | ||
1454 | /* mark for sending loop detect on all VLANs */ | |
1455 | send_loopdetect = true; | |
1456 | } | |
1457 | ||
807736f6 | 1458 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1459 | if (!hash) |
1460 | goto out; | |
1461 | ||
1462 | for (i = 0; i < hash->size; i++) { | |
1463 | head = &hash->table[i]; | |
1464 | ||
1465 | rcu_read_lock(); | |
b67bfe0d | 1466 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1467 | if (!batadv_compare_eth(backbone_gw->orig, |
1468 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1469 | continue; |
1470 | ||
1471 | backbone_gw->lasttime = jiffies; | |
1472 | ||
3b300de3 | 1473 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1474 | if (send_loopdetect) |
1475 | batadv_bla_send_loopdetect(bat_priv, | |
1476 | backbone_gw); | |
d807f272 SW |
1477 | |
1478 | /* request_sent is only set after creation to avoid | |
1479 | * problems when we are not yet known as backbone gw | |
1480 | * in the backbone. | |
1481 | * | |
28709878 SW |
1482 | * We can reset this now after we waited some periods |
1483 | * to give bridge forward delays and bla group forming | |
1484 | * some grace time. | |
d807f272 SW |
1485 | */ |
1486 | ||
1487 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1488 | continue; | |
1489 | ||
28709878 SW |
1490 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1491 | continue; | |
1492 | ||
d807f272 SW |
1493 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1494 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1495 | } |
1496 | rcu_read_unlock(); | |
1497 | } | |
1498 | out: | |
1499 | if (primary_if) | |
82047ad7 | 1500 | batadv_hardif_put(primary_if); |
23721387 | 1501 | |
72414442 AQ |
1502 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1503 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1504 | } |
1505 | ||
5d52dad2 SE |
1506 | /* The hash for claim and backbone hash receive the same key because they |
1507 | * are getting initialized by hash_new with the same key. Reinitializing | |
1508 | * them with to different keys to allow nested locking without generating | |
1509 | * lockdep warnings | |
1510 | */ | |
3b300de3 SE |
1511 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1512 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1513 | |
04e14be6 SW |
1514 | /** |
1515 | * batadv_bla_init - initialize all bla structures | |
1516 | * @bat_priv: the bat priv with all the soft interface information | |
1517 | * | |
1518 | * Return: 0 on success, < 0 on error. | |
1519 | */ | |
56303d34 | 1520 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1521 | { |
fe2da6ff | 1522 | int i; |
6b5e971a | 1523 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1524 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1525 | u16 crc; |
807736f6 | 1526 | unsigned long entrytime; |
fe2da6ff | 1527 | |
7dac7b76 LL |
1528 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1529 | ||
39c75a51 | 1530 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1531 | |
38ef3d1d | 1532 | /* setting claim destination address */ |
807736f6 SE |
1533 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1534 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1535 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1536 | if (primary_if) { |
807736f6 SE |
1537 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1538 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1539 | batadv_hardif_put(primary_if); |
38ef3d1d | 1540 | } else { |
807736f6 | 1541 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1542 | } |
1543 | ||
fe2da6ff | 1544 | /* initialize the duplicate list */ |
807736f6 | 1545 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1546 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1547 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1548 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1549 | |
cd9c7bfb SW |
1550 | atomic_set(&bat_priv->bla.loopdetect_next, |
1551 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1552 | ||
807736f6 | 1553 | if (bat_priv->bla.claim_hash) |
5346c35e | 1554 | return 0; |
23721387 | 1555 | |
807736f6 SE |
1556 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1557 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1558 | |
807736f6 | 1559 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1560 | return -ENOMEM; |
23721387 | 1561 | |
807736f6 | 1562 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1563 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1564 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1565 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1566 | |
39c75a51 | 1567 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1568 | |
72414442 AQ |
1569 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1570 | ||
1571 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1572 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1573 | return 0; |
23721387 SW |
1574 | } |
1575 | ||
2c53040f | 1576 | /** |
04e14be6 | 1577 | * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. |
2c53040f | 1578 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1579 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1580 | * |
1581 | * check if it is on our broadcast list. Another gateway might | |
1582 | * have sent the same packet because it is connected to the same backbone, | |
1583 | * so we have to remove this duplicate. | |
1584 | * | |
1585 | * This is performed by checking the CRC, which will tell us | |
1586 | * with a good chance that it is the same packet. If it is furthermore | |
1587 | * sent by another host, drop it. We allow equal packets from | |
1588 | * the same host however as this might be intended. | |
04e14be6 | 1589 | * |
4b426b10 | 1590 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1591 | */ |
4b426b10 SE |
1592 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
1593 | struct sk_buff *skb) | |
fe2da6ff | 1594 | { |
4b426b10 | 1595 | int i, curr; |
004e86fc SW |
1596 | __be32 crc; |
1597 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1598 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1599 | bool ret = false; |
fe2da6ff | 1600 | |
004e86fc | 1601 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1602 | |
1603 | /* calculate the crc ... */ | |
004e86fc | 1604 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1605 | |
7dac7b76 LL |
1606 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1607 | ||
42d0b044 | 1608 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1609 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1610 | curr %= BATADV_DUPLIST_SIZE; | |
1611 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1612 | |
1613 | /* we can stop searching if the entry is too old ; | |
1614 | * later entries will be even older | |
1615 | */ | |
42d0b044 SE |
1616 | if (batadv_has_timed_out(entry->entrytime, |
1617 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1618 | break; |
1619 | ||
1620 | if (entry->crc != crc) | |
1621 | continue; | |
1622 | ||
1eda58bf | 1623 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1624 | continue; |
1625 | ||
1626 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1627 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1628 | */ |
4b426b10 | 1629 | ret = true; |
7dac7b76 | 1630 | goto out; |
fe2da6ff | 1631 | } |
7dac7b76 | 1632 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1633 | * and allow it, its the first occurrence. |
7dac7b76 | 1634 | */ |
807736f6 | 1635 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1636 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1637 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1638 | entry->crc = crc; |
1639 | entry->entrytime = jiffies; | |
8fdd0153 | 1640 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1641 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1642 | |
7dac7b76 LL |
1643 | out: |
1644 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1645 | ||
1646 | return ret; | |
fe2da6ff SW |
1647 | } |
1648 | ||
1b371d13 | 1649 | /** |
04e14be6 SW |
1650 | * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for |
1651 | * the VLAN identified by vid. | |
1b371d13 | 1652 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1653 | * @orig: originator mac address |
cfd4f757 | 1654 | * @vid: VLAN identifier |
20ff9d59 | 1655 | * |
62fe710f | 1656 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1657 | */ |
6b5e971a | 1658 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1659 | unsigned short vid) |
20ff9d59 | 1660 | { |
807736f6 | 1661 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1662 | struct hlist_head *head; |
bae98774 | 1663 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1664 | int i; |
1665 | ||
1666 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1667 | return false; |
20ff9d59 SW |
1668 | |
1669 | if (!hash) | |
cfd4f757 | 1670 | return false; |
20ff9d59 SW |
1671 | |
1672 | for (i = 0; i < hash->size; i++) { | |
1673 | head = &hash->table[i]; | |
1674 | ||
1675 | rcu_read_lock(); | |
b67bfe0d | 1676 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1677 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1678 | backbone_gw->vid == vid) { | |
20ff9d59 | 1679 | rcu_read_unlock(); |
cfd4f757 | 1680 | return true; |
20ff9d59 SW |
1681 | } |
1682 | } | |
1683 | rcu_read_unlock(); | |
1684 | } | |
1685 | ||
cfd4f757 | 1686 | return false; |
20ff9d59 SW |
1687 | } |
1688 | ||
2c53040f | 1689 | /** |
04e14be6 | 1690 | * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. |
2c53040f | 1691 | * @skb: the frame to be checked |
23721387 SW |
1692 | * @orig_node: the orig_node of the frame |
1693 | * @hdr_size: maximum length of the frame | |
1694 | * | |
4b426b10 SE |
1695 | * Return: true if the orig_node is also a gateway on the soft interface, |
1696 | * otherwise it returns false. | |
23721387 | 1697 | */ |
4b426b10 SE |
1698 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1699 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1700 | { |
bae98774 | 1701 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1702 | unsigned short vid; |
23721387 SW |
1703 | |
1704 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1705 | return false; |
23721387 SW |
1706 | |
1707 | /* first, find out the vid. */ | |
0d125074 | 1708 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1709 | return false; |
23721387 | 1710 | |
c018ad3d | 1711 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1712 | |
1713 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1714 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1715 | orig_node->orig, vid); | |
23721387 | 1716 | if (!backbone_gw) |
4b426b10 | 1717 | return false; |
23721387 | 1718 | |
c8b86c12 | 1719 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1720 | return true; |
23721387 SW |
1721 | } |
1722 | ||
04e14be6 | 1723 | /** |
6d030de8 | 1724 | * batadv_bla_free - free all bla structures |
04e14be6 SW |
1725 | * @bat_priv: the bat priv with all the soft interface information |
1726 | * | |
1727 | * for softinterface free or module unload | |
1728 | */ | |
56303d34 | 1729 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1730 | { |
56303d34 | 1731 | struct batadv_hard_iface *primary_if; |
23721387 | 1732 | |
807736f6 | 1733 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1734 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1735 | |
807736f6 | 1736 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1737 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1738 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1739 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1740 | } |
807736f6 | 1741 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1742 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1743 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1744 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1745 | } |
1746 | if (primary_if) | |
82047ad7 | 1747 | batadv_hardif_put(primary_if); |
23721387 SW |
1748 | } |
1749 | ||
cd9c7bfb SW |
1750 | /** |
1751 | * batadv_bla_loopdetect_check - check and handle a detected loop | |
1752 | * @bat_priv: the bat priv with all the soft interface information | |
1753 | * @skb: the packet to check | |
1754 | * @primary_if: interface where the request came on | |
1755 | * @vid: the VLAN ID of the frame | |
1756 | * | |
1757 | * Checks if this packet is a loop detect frame which has been sent by us, | |
1758 | * throw an uevent and log the event if that is the case. | |
1759 | * | |
1760 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1761 | * otherwise. | |
1762 | */ | |
1763 | static bool | |
1764 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1765 | struct batadv_hard_iface *primary_if, | |
1766 | unsigned short vid) | |
1767 | { | |
1768 | struct batadv_bla_backbone_gw *backbone_gw; | |
1769 | struct ethhdr *ethhdr; | |
1770 | ||
1771 | ethhdr = eth_hdr(skb); | |
1772 | ||
1773 | /* Only check for the MAC address and skip more checks here for | |
1774 | * performance reasons - this function is on the hotpath, after all. | |
1775 | */ | |
1776 | if (!batadv_compare_eth(ethhdr->h_source, | |
1777 | bat_priv->bla.loopdetect_addr)) | |
1778 | return false; | |
1779 | ||
1780 | /* If the packet came too late, don't forward it on the mesh | |
1781 | * but don't consider that as loop. It might be a coincidence. | |
1782 | */ | |
1783 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1784 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1785 | return true; | |
1786 | ||
1787 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1788 | primary_if->net_dev->dev_addr, | |
1789 | vid, true); | |
1790 | if (unlikely(!backbone_gw)) | |
1791 | return true; | |
1792 | ||
1793 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); | |
1794 | /* backbone_gw is unreferenced in the report work function function */ | |
1795 | ||
1796 | return true; | |
1797 | } | |
1798 | ||
2c53040f | 1799 | /** |
04e14be6 | 1800 | * batadv_bla_rx - check packets coming from the mesh. |
2c53040f | 1801 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1802 | * @skb: the frame to be checked |
1803 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1804 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1805 | * |
04e14be6 | 1806 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1807 | * * we have to race for a claim |
1808 | * * if the frame is allowed on the LAN | |
1809 | * | |
62fe710f SE |
1810 | * in these cases, the skb is further handled by this function |
1811 | * | |
4b426b10 SE |
1812 | * Return: true if handled, otherwise it returns false and the caller shall |
1813 | * further process the skb. | |
23721387 | 1814 | */ |
4b426b10 SE |
1815 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1816 | unsigned short vid, bool is_bcast) | |
23721387 | 1817 | { |
3db0decf | 1818 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1819 | struct ethhdr *ethhdr; |
712bbfe4 | 1820 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1821 | struct batadv_hard_iface *primary_if; |
3db0decf | 1822 | bool own_claim; |
4b426b10 | 1823 | bool ret; |
23721387 | 1824 | |
7ed4be95 | 1825 | ethhdr = eth_hdr(skb); |
23721387 | 1826 | |
e5d89254 | 1827 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1828 | if (!primary_if) |
1829 | goto handled; | |
1830 | ||
1831 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1832 | goto allow; | |
1833 | ||
cd9c7bfb SW |
1834 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1835 | goto handled; | |
1836 | ||
807736f6 | 1837 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1838 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1839 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1840 | goto handled; |
1841 | ||
8fdd0153 | 1842 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1843 | search_claim.vid = vid; |
3b300de3 | 1844 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1845 | |
1846 | if (!claim) { | |
1847 | /* possible optimization: race for a claim */ | |
1848 | /* No claim exists yet, claim it for us! | |
1849 | */ | |
3b300de3 SE |
1850 | batadv_handle_claim(bat_priv, primary_if, |
1851 | primary_if->net_dev->dev_addr, | |
1852 | ethhdr->h_source, vid); | |
23721387 SW |
1853 | goto allow; |
1854 | } | |
1855 | ||
1856 | /* if it is our own claim ... */ | |
3db0decf SE |
1857 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1858 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1859 | primary_if->net_dev->dev_addr); | |
1860 | batadv_backbone_gw_put(backbone_gw); | |
1861 | ||
1862 | if (own_claim) { | |
23721387 SW |
1863 | /* ... allow it in any case */ |
1864 | claim->lasttime = jiffies; | |
1865 | goto allow; | |
1866 | } | |
1867 | ||
1868 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1869 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1870 | /* ... drop it. the responsible gateway is in charge. | |
1871 | * | |
1872 | * We need to check is_bcast because with the gateway | |
1873 | * feature, broadcasts (like DHCP requests) may be sent | |
1874 | * using a unicast packet type. | |
1875 | */ | |
23721387 SW |
1876 | goto handled; |
1877 | } else { | |
1878 | /* seems the client considers us as its best gateway. | |
1879 | * send a claim and update the claim table | |
1880 | * immediately. | |
1881 | */ | |
3b300de3 SE |
1882 | batadv_handle_claim(bat_priv, primary_if, |
1883 | primary_if->net_dev->dev_addr, | |
1884 | ethhdr->h_source, vid); | |
23721387 SW |
1885 | goto allow; |
1886 | } | |
1887 | allow: | |
3b300de3 | 1888 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1889 | ret = false; |
23721387 SW |
1890 | goto out; |
1891 | ||
1892 | handled: | |
1893 | kfree_skb(skb); | |
4b426b10 | 1894 | ret = true; |
23721387 SW |
1895 | |
1896 | out: | |
1897 | if (primary_if) | |
82047ad7 | 1898 | batadv_hardif_put(primary_if); |
23721387 | 1899 | if (claim) |
321e3e08 | 1900 | batadv_claim_put(claim); |
23721387 SW |
1901 | return ret; |
1902 | } | |
1903 | ||
2c53040f | 1904 | /** |
04e14be6 | 1905 | * batadv_bla_tx - check packets going into the mesh |
2c53040f | 1906 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1907 | * @skb: the frame to be checked |
1908 | * @vid: the VLAN ID of the frame | |
1909 | * | |
04e14be6 | 1910 | * batadv_bla_tx checks if: |
23721387 SW |
1911 | * * a claim was received which has to be processed |
1912 | * * the frame is allowed on the mesh | |
1913 | * | |
62fe710f | 1914 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1915 | * |
1916 | * This call might reallocate skb data. | |
62fe710f | 1917 | * |
4b426b10 SE |
1918 | * Return: true if handled, otherwise it returns false and the caller shall |
1919 | * further process the skb. | |
23721387 | 1920 | */ |
4b426b10 SE |
1921 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1922 | unsigned short vid) | |
23721387 SW |
1923 | { |
1924 | struct ethhdr *ethhdr; | |
712bbfe4 | 1925 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 1926 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 1927 | struct batadv_hard_iface *primary_if; |
3db0decf | 1928 | bool client_roamed; |
4b426b10 | 1929 | bool ret = false; |
23721387 | 1930 | |
e5d89254 | 1931 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1932 | if (!primary_if) |
1933 | goto out; | |
1934 | ||
1935 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1936 | goto allow; | |
1937 | ||
3b300de3 | 1938 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1939 | goto handled; |
1940 | ||
7ed4be95 | 1941 | ethhdr = eth_hdr(skb); |
23721387 | 1942 | |
807736f6 | 1943 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1944 | /* don't allow broadcasts while requests are in flight */ |
1945 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1946 | goto handled; | |
1947 | ||
8fdd0153 | 1948 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1949 | search_claim.vid = vid; |
1950 | ||
3b300de3 | 1951 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1952 | |
1953 | /* if no claim exists, allow it. */ | |
1954 | if (!claim) | |
1955 | goto allow; | |
1956 | ||
1957 | /* check if we are responsible. */ | |
3db0decf SE |
1958 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1959 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
1960 | primary_if->net_dev->dev_addr); | |
1961 | batadv_backbone_gw_put(backbone_gw); | |
1962 | ||
1963 | if (client_roamed) { | |
23721387 SW |
1964 | /* if yes, the client has roamed and we have |
1965 | * to unclaim it. | |
1966 | */ | |
3b300de3 SE |
1967 | batadv_handle_unclaim(bat_priv, primary_if, |
1968 | primary_if->net_dev->dev_addr, | |
1969 | ethhdr->h_source, vid); | |
23721387 SW |
1970 | goto allow; |
1971 | } | |
1972 | ||
1973 | /* check if it is a multicast/broadcast frame */ | |
1974 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1975 | /* drop it. the responsible gateway has forwarded it into | |
1976 | * the backbone network. | |
1977 | */ | |
1978 | goto handled; | |
1979 | } else { | |
1980 | /* we must allow it. at least if we are | |
1981 | * responsible for the DESTINATION. | |
1982 | */ | |
1983 | goto allow; | |
1984 | } | |
1985 | allow: | |
3b300de3 | 1986 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1987 | ret = false; |
23721387 SW |
1988 | goto out; |
1989 | handled: | |
4b426b10 | 1990 | ret = true; |
23721387 SW |
1991 | out: |
1992 | if (primary_if) | |
82047ad7 | 1993 | batadv_hardif_put(primary_if); |
23721387 | 1994 | if (claim) |
321e3e08 | 1995 | batadv_claim_put(claim); |
23721387 SW |
1996 | return ret; |
1997 | } | |
9bf8e4d4 | 1998 | |
dc1cbd14 | 1999 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 SW |
2000 | /** |
2001 | * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file | |
2002 | * @seq: seq file to print on | |
2003 | * @offset: not used | |
2004 | * | |
2005 | * Return: always 0 | |
2006 | */ | |
08adf151 | 2007 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
2008 | { |
2009 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 2010 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 2011 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
3db0decf | 2012 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 2013 | struct batadv_bla_claim *claim; |
56303d34 | 2014 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 2015 | struct hlist_head *head; |
5a1dd8a4 | 2016 | u16 backbone_crc; |
6b5e971a | 2017 | u32 i; |
9bf8e4d4 | 2018 | bool is_own; |
6b5e971a | 2019 | u8 *primary_addr; |
9bf8e4d4 | 2020 | |
30da63a6 ML |
2021 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2022 | if (!primary_if) | |
9bf8e4d4 | 2023 | goto out; |
9bf8e4d4 | 2024 | |
1eda58bf | 2025 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 2026 | seq_printf(seq, |
39a32991 | 2027 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 2028 | net_dev->name, primary_addr, |
807736f6 | 2029 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 AQ |
2030 | seq_puts(seq, |
2031 | " Client VID Originator [o] (CRC )\n"); | |
9bf8e4d4 SW |
2032 | for (i = 0; i < hash->size; i++) { |
2033 | head = &hash->table[i]; | |
2034 | ||
2035 | rcu_read_lock(); | |
b67bfe0d | 2036 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf SE |
2037 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2038 | ||
2039 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 2040 | primary_addr); |
5a1dd8a4 | 2041 | |
3db0decf SE |
2042 | spin_lock_bh(&backbone_gw->crc_lock); |
2043 | backbone_crc = backbone_gw->crc; | |
2044 | spin_unlock_bh(&backbone_gw->crc_lock); | |
eb2deb6b | 2045 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 2046 | claim->addr, BATADV_PRINT_VID(claim->vid), |
3db0decf | 2047 | backbone_gw->orig, |
9bf8e4d4 | 2048 | (is_own ? 'x' : ' '), |
5a1dd8a4 | 2049 | backbone_crc); |
3db0decf SE |
2050 | |
2051 | batadv_backbone_gw_put(backbone_gw); | |
9bf8e4d4 SW |
2052 | } |
2053 | rcu_read_unlock(); | |
2054 | } | |
2055 | out: | |
2056 | if (primary_if) | |
82047ad7 | 2057 | batadv_hardif_put(primary_if); |
30da63a6 | 2058 | return 0; |
9bf8e4d4 | 2059 | } |
dc1cbd14 | 2060 | #endif |
536a23f1 | 2061 | |
04f3f5bf AL |
2062 | /** |
2063 | * batadv_bla_claim_dump_entry - dump one entry of the claim table | |
2064 | * to a netlink socket | |
2065 | * @msg: buffer for the message | |
2066 | * @portid: netlink port | |
2067 | * @seq: Sequence number of netlink message | |
2068 | * @primary_if: primary interface | |
2069 | * @claim: entry to dump | |
2070 | * | |
2071 | * Return: 0 or error code. | |
2072 | */ | |
2073 | static int | |
2074 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2075 | struct batadv_hard_iface *primary_if, | |
2076 | struct batadv_bla_claim *claim) | |
2077 | { | |
2078 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2079 | u16 backbone_crc; | |
2080 | bool is_own; | |
2081 | void *hdr; | |
2082 | int ret = -EINVAL; | |
2083 | ||
2084 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2085 | NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM); | |
2086 | if (!hdr) { | |
2087 | ret = -ENOBUFS; | |
2088 | goto out; | |
2089 | } | |
2090 | ||
2091 | is_own = batadv_compare_eth(claim->backbone_gw->orig, | |
2092 | primary_addr); | |
2093 | ||
2094 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
2095 | backbone_crc = claim->backbone_gw->crc; | |
2096 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
2097 | ||
2098 | if (is_own) | |
2099 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2100 | genlmsg_cancel(msg, hdr); | |
2101 | goto out; | |
2102 | } | |
2103 | ||
2104 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || | |
2105 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || | |
2106 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2107 | claim->backbone_gw->orig) || | |
2108 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2109 | backbone_crc)) { | |
2110 | genlmsg_cancel(msg, hdr); | |
2111 | goto out; | |
2112 | } | |
2113 | ||
2114 | genlmsg_end(msg, hdr); | |
2115 | ret = 0; | |
2116 | ||
2117 | out: | |
2118 | return ret; | |
2119 | } | |
2120 | ||
2121 | /** | |
2122 | * batadv_bla_claim_dump_bucket - dump one bucket of the claim table | |
2123 | * to a netlink socket | |
2124 | * @msg: buffer for the message | |
2125 | * @portid: netlink port | |
2126 | * @seq: Sequence number of netlink message | |
2127 | * @primary_if: primary interface | |
2128 | * @head: bucket to dump | |
2129 | * @idx_skip: How many entries to skip | |
2130 | * | |
2131 | * Return: always 0. | |
2132 | */ | |
2133 | static int | |
2134 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2135 | struct batadv_hard_iface *primary_if, | |
2136 | struct hlist_head *head, int *idx_skip) | |
2137 | { | |
2138 | struct batadv_bla_claim *claim; | |
2139 | int idx = 0; | |
2140 | ||
2141 | rcu_read_lock(); | |
2142 | hlist_for_each_entry_rcu(claim, head, hash_entry) { | |
2143 | if (idx++ < *idx_skip) | |
2144 | continue; | |
2145 | if (batadv_bla_claim_dump_entry(msg, portid, seq, | |
2146 | primary_if, claim)) { | |
2147 | *idx_skip = idx - 1; | |
2148 | goto unlock; | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | *idx_skip = idx; | |
2153 | unlock: | |
2154 | rcu_read_unlock(); | |
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | /** | |
2159 | * batadv_bla_claim_dump - dump claim table to a netlink socket | |
2160 | * @msg: buffer for the message | |
2161 | * @cb: callback structure containing arguments | |
2162 | * | |
2163 | * Return: message length. | |
2164 | */ | |
2165 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2166 | { | |
2167 | struct batadv_hard_iface *primary_if = NULL; | |
2168 | int portid = NETLINK_CB(cb->skb).portid; | |
2169 | struct net *net = sock_net(cb->skb->sk); | |
2170 | struct net_device *soft_iface; | |
2171 | struct batadv_hashtable *hash; | |
2172 | struct batadv_priv *bat_priv; | |
2173 | int bucket = cb->args[0]; | |
2174 | struct hlist_head *head; | |
2175 | int idx = cb->args[1]; | |
2176 | int ifindex; | |
2177 | int ret = 0; | |
2178 | ||
2179 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2180 | BATADV_ATTR_MESH_IFINDEX); | |
2181 | if (!ifindex) | |
2182 | return -EINVAL; | |
2183 | ||
2184 | soft_iface = dev_get_by_index(net, ifindex); | |
2185 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2186 | ret = -ENODEV; | |
2187 | goto out; | |
2188 | } | |
2189 | ||
2190 | bat_priv = netdev_priv(soft_iface); | |
2191 | hash = bat_priv->bla.claim_hash; | |
2192 | ||
2193 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2194 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2195 | ret = -ENOENT; | |
2196 | goto out; | |
2197 | } | |
2198 | ||
2199 | while (bucket < hash->size) { | |
2200 | head = &hash->table[bucket]; | |
2201 | ||
2202 | if (batadv_bla_claim_dump_bucket(msg, portid, | |
2203 | cb->nlh->nlmsg_seq, | |
2204 | primary_if, head, &idx)) | |
2205 | break; | |
2206 | bucket++; | |
2207 | } | |
2208 | ||
2209 | cb->args[0] = bucket; | |
2210 | cb->args[1] = idx; | |
2211 | ||
2212 | ret = msg->len; | |
2213 | ||
2214 | out: | |
2215 | if (primary_if) | |
2216 | batadv_hardif_put(primary_if); | |
2217 | ||
2218 | if (soft_iface) | |
2219 | dev_put(soft_iface); | |
2220 | ||
2221 | return ret; | |
2222 | } | |
2223 | ||
dc1cbd14 | 2224 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 SW |
2225 | /** |
2226 | * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq | |
2227 | * file | |
2228 | * @seq: seq file to print on | |
2229 | * @offset: not used | |
2230 | * | |
2231 | * Return: always 0 | |
2232 | */ | |
536a23f1 SW |
2233 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
2234 | { | |
2235 | struct net_device *net_dev = (struct net_device *)seq->private; | |
2236 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 2237 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 2238 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 2239 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
2240 | struct hlist_head *head; |
2241 | int secs, msecs; | |
5a1dd8a4 | 2242 | u16 backbone_crc; |
6b5e971a | 2243 | u32 i; |
536a23f1 | 2244 | bool is_own; |
6b5e971a | 2245 | u8 *primary_addr; |
536a23f1 | 2246 | |
30da63a6 ML |
2247 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2248 | if (!primary_if) | |
536a23f1 | 2249 | goto out; |
536a23f1 SW |
2250 | |
2251 | primary_addr = primary_if->net_dev->dev_addr; | |
2252 | seq_printf(seq, | |
39a32991 | 2253 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 2254 | net_dev->name, primary_addr, |
807736f6 | 2255 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 | 2256 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
536a23f1 SW |
2257 | for (i = 0; i < hash->size; i++) { |
2258 | head = &hash->table[i]; | |
2259 | ||
2260 | rcu_read_lock(); | |
b67bfe0d | 2261 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
2262 | msecs = jiffies_to_msecs(jiffies - |
2263 | backbone_gw->lasttime); | |
2264 | secs = msecs / 1000; | |
2265 | msecs = msecs % 1000; | |
2266 | ||
2267 | is_own = batadv_compare_eth(backbone_gw->orig, | |
2268 | primary_addr); | |
2269 | if (is_own) | |
2270 | continue; | |
2271 | ||
5a1dd8a4 SW |
2272 | spin_lock_bh(&backbone_gw->crc_lock); |
2273 | backbone_crc = backbone_gw->crc; | |
2274 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2275 | ||
eb2deb6b | 2276 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
2277 | backbone_gw->orig, |
2278 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 2279 | msecs, backbone_crc); |
536a23f1 SW |
2280 | } |
2281 | rcu_read_unlock(); | |
2282 | } | |
2283 | out: | |
2284 | if (primary_if) | |
82047ad7 | 2285 | batadv_hardif_put(primary_if); |
30da63a6 | 2286 | return 0; |
536a23f1 | 2287 | } |
dc1cbd14 | 2288 | #endif |
ea4152e1 SW |
2289 | |
2290 | /** | |
2291 | * batadv_bla_backbone_dump_entry - dump one entry of the backbone table | |
2292 | * to a netlink socket | |
2293 | * @msg: buffer for the message | |
2294 | * @portid: netlink port | |
2295 | * @seq: Sequence number of netlink message | |
2296 | * @primary_if: primary interface | |
2297 | * @backbone_gw: entry to dump | |
2298 | * | |
2299 | * Return: 0 or error code. | |
2300 | */ | |
2301 | static int | |
2302 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2303 | struct batadv_hard_iface *primary_if, | |
2304 | struct batadv_bla_backbone_gw *backbone_gw) | |
2305 | { | |
2306 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2307 | u16 backbone_crc; | |
2308 | bool is_own; | |
2309 | int msecs; | |
2310 | void *hdr; | |
2311 | int ret = -EINVAL; | |
2312 | ||
2313 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2314 | NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE); | |
2315 | if (!hdr) { | |
2316 | ret = -ENOBUFS; | |
2317 | goto out; | |
2318 | } | |
2319 | ||
2320 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); | |
2321 | ||
2322 | spin_lock_bh(&backbone_gw->crc_lock); | |
2323 | backbone_crc = backbone_gw->crc; | |
2324 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2325 | ||
2326 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); | |
2327 | ||
2328 | if (is_own) | |
2329 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2330 | genlmsg_cancel(msg, hdr); | |
2331 | goto out; | |
2332 | } | |
2333 | ||
2334 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2335 | backbone_gw->orig) || | |
2336 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || | |
2337 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2338 | backbone_crc) || | |
2339 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { | |
2340 | genlmsg_cancel(msg, hdr); | |
2341 | goto out; | |
2342 | } | |
2343 | ||
2344 | genlmsg_end(msg, hdr); | |
2345 | ret = 0; | |
2346 | ||
2347 | out: | |
2348 | return ret; | |
2349 | } | |
2350 | ||
2351 | /** | |
2352 | * batadv_bla_backbone_dump_bucket - dump one bucket of the backbone table | |
2353 | * to a netlink socket | |
2354 | * @msg: buffer for the message | |
2355 | * @portid: netlink port | |
2356 | * @seq: Sequence number of netlink message | |
2357 | * @primary_if: primary interface | |
2358 | * @head: bucket to dump | |
2359 | * @idx_skip: How many entries to skip | |
2360 | * | |
2361 | * Return: always 0. | |
2362 | */ | |
2363 | static int | |
2364 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2365 | struct batadv_hard_iface *primary_if, | |
2366 | struct hlist_head *head, int *idx_skip) | |
2367 | { | |
2368 | struct batadv_bla_backbone_gw *backbone_gw; | |
2369 | int idx = 0; | |
2370 | ||
2371 | rcu_read_lock(); | |
2372 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { | |
2373 | if (idx++ < *idx_skip) | |
2374 | continue; | |
2375 | if (batadv_bla_backbone_dump_entry(msg, portid, seq, | |
2376 | primary_if, backbone_gw)) { | |
2377 | *idx_skip = idx - 1; | |
2378 | goto unlock; | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | *idx_skip = idx; | |
2383 | unlock: | |
2384 | rcu_read_unlock(); | |
2385 | return 0; | |
2386 | } | |
2387 | ||
2388 | /** | |
2389 | * batadv_bla_backbone_dump - dump backbone table to a netlink socket | |
2390 | * @msg: buffer for the message | |
2391 | * @cb: callback structure containing arguments | |
2392 | * | |
2393 | * Return: message length. | |
2394 | */ | |
2395 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2396 | { | |
2397 | struct batadv_hard_iface *primary_if = NULL; | |
2398 | int portid = NETLINK_CB(cb->skb).portid; | |
2399 | struct net *net = sock_net(cb->skb->sk); | |
2400 | struct net_device *soft_iface; | |
2401 | struct batadv_hashtable *hash; | |
2402 | struct batadv_priv *bat_priv; | |
2403 | int bucket = cb->args[0]; | |
2404 | struct hlist_head *head; | |
2405 | int idx = cb->args[1]; | |
2406 | int ifindex; | |
2407 | int ret = 0; | |
2408 | ||
2409 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2410 | BATADV_ATTR_MESH_IFINDEX); | |
2411 | if (!ifindex) | |
2412 | return -EINVAL; | |
2413 | ||
2414 | soft_iface = dev_get_by_index(net, ifindex); | |
2415 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2416 | ret = -ENODEV; | |
2417 | goto out; | |
2418 | } | |
2419 | ||
2420 | bat_priv = netdev_priv(soft_iface); | |
2421 | hash = bat_priv->bla.backbone_hash; | |
2422 | ||
2423 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2424 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2425 | ret = -ENOENT; | |
2426 | goto out; | |
2427 | } | |
2428 | ||
2429 | while (bucket < hash->size) { | |
2430 | head = &hash->table[bucket]; | |
2431 | ||
2432 | if (batadv_bla_backbone_dump_bucket(msg, portid, | |
2433 | cb->nlh->nlmsg_seq, | |
2434 | primary_if, head, &idx)) | |
2435 | break; | |
2436 | bucket++; | |
2437 | } | |
2438 | ||
2439 | cb->args[0] = bucket; | |
2440 | cb->args[1] = idx; | |
2441 | ||
2442 | ret = msg->len; | |
2443 | ||
2444 | out: | |
2445 | if (primary_if) | |
2446 | batadv_hardif_put(primary_if); | |
2447 | ||
2448 | if (soft_iface) | |
2449 | dev_put(soft_iface); | |
2450 | ||
2451 | return ret; | |
2452 | } |