Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac79cbb9 | 2 | /* Copyright (C) 2011-2017 B.A.T.M.A.N. contributors: |
23721387 SW |
3 | * |
4 | * Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23721387 SW |
17 | */ |
18 | ||
23721387 | 19 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 20 | #include "main.h" |
23721387 | 21 | |
1e2c2a4f SE |
22 | #include <linux/atomic.h> |
23 | #include <linux/byteorder/generic.h> | |
24 | #include <linux/compiler.h> | |
23721387 | 25 | #include <linux/crc16.h> |
1e2c2a4f SE |
26 | #include <linux/errno.h> |
27 | #include <linux/etherdevice.h> | |
b92b94ac | 28 | #include <linux/gfp.h> |
23721387 | 29 | #include <linux/if_arp.h> |
1e2c2a4f | 30 | #include <linux/if_ether.h> |
23721387 | 31 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
32 | #include <linux/jhash.h> |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/kernel.h> | |
06e56ded | 35 | #include <linux/kref.h> |
1e2c2a4f SE |
36 | #include <linux/list.h> |
37 | #include <linux/lockdep.h> | |
38 | #include <linux/netdevice.h> | |
04f3f5bf | 39 | #include <linux/netlink.h> |
1e2c2a4f SE |
40 | #include <linux/rculist.h> |
41 | #include <linux/rcupdate.h> | |
42 | #include <linux/seq_file.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/stddef.h> | |
47 | #include <linux/string.h> | |
48 | #include <linux/workqueue.h> | |
49 | #include <net/arp.h> | |
04f3f5bf AL |
50 | #include <net/genetlink.h> |
51 | #include <net/netlink.h> | |
52 | #include <net/sock.h> | |
fec149f5 | 53 | #include <uapi/linux/batadv_packet.h> |
04f3f5bf | 54 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f SE |
55 | |
56 | #include "hard-interface.h" | |
57 | #include "hash.h" | |
ba412080 | 58 | #include "log.h" |
04f3f5bf | 59 | #include "netlink.h" |
1e2c2a4f | 60 | #include "originator.h" |
04f3f5bf | 61 | #include "soft-interface.h" |
cd9c7bfb | 62 | #include "sysfs.h" |
1e2c2a4f | 63 | #include "translation-table.h" |
23721387 | 64 | |
6b5e971a | 65 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 66 | |
3b300de3 | 67 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
68 | static void |
69 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
70 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 71 | |
62fe710f | 72 | /** |
7e9a8c2c | 73 | * batadv_choose_claim() - choose the right bucket for a claim. |
04e14be6 SW |
74 | * @data: data to hash |
75 | * @size: size of the hash table | |
62fe710f | 76 | * |
04e14be6 | 77 | * Return: the hash index of the claim |
62fe710f | 78 | */ |
6b5e971a | 79 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 80 | { |
712bbfe4 | 81 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 82 | u32 hash = 0; |
23721387 | 83 | |
36fd61cb SE |
84 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
85 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
86 | |
87 | return hash % size; | |
88 | } | |
89 | ||
62fe710f | 90 | /** |
7e9a8c2c | 91 | * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
04e14be6 SW |
92 | * @data: data to hash |
93 | * @size: size of the hash table | |
62fe710f | 94 | * |
04e14be6 | 95 | * Return: the hash index of the backbone gateway |
62fe710f | 96 | */ |
6b5e971a | 97 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 98 | { |
712bbfe4 | 99 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 100 | u32 hash = 0; |
23721387 | 101 | |
36fd61cb SE |
102 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
103 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
104 | |
105 | return hash % size; | |
106 | } | |
107 | ||
04e14be6 | 108 | /** |
7e9a8c2c | 109 | * batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
04e14be6 SW |
110 | * @node: list node of the first entry to compare |
111 | * @data2: pointer to the second backbone gateway | |
112 | * | |
4b426b10 | 113 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 114 | */ |
4b426b10 SE |
115 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
116 | const void *data2) | |
23721387 | 117 | { |
bae98774 | 118 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 119 | hash_entry); |
4f248cff SE |
120 | const struct batadv_bla_backbone_gw *gw1 = data1; |
121 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 122 | |
c76d1525 | 123 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 124 | return false; |
c76d1525 SW |
125 | |
126 | if (gw1->vid != gw2->vid) | |
4b426b10 | 127 | return false; |
c76d1525 | 128 | |
4b426b10 | 129 | return true; |
23721387 SW |
130 | } |
131 | ||
04e14be6 | 132 | /** |
7e9a8c2c | 133 | * batadv_compare_claim() - compare address and vid of two claims |
04e14be6 SW |
134 | * @node: list node of the first entry to compare |
135 | * @data2: pointer to the second claims | |
136 | * | |
4b426b10 | 137 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 138 | */ |
4b426b10 SE |
139 | static bool batadv_compare_claim(const struct hlist_node *node, |
140 | const void *data2) | |
23721387 | 141 | { |
712bbfe4 | 142 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 143 | hash_entry); |
4f248cff SE |
144 | const struct batadv_bla_claim *cl1 = data1; |
145 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
146 | |
147 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 148 | return false; |
c76d1525 SW |
149 | |
150 | if (cl1->vid != cl2->vid) | |
4b426b10 | 151 | return false; |
23721387 | 152 | |
4b426b10 | 153 | return true; |
23721387 SW |
154 | } |
155 | ||
04e14be6 | 156 | /** |
7e9a8c2c | 157 | * batadv_backbone_gw_release() - release backbone gw from lists and queue for |
06e56ded SE |
158 | * free after rcu grace period |
159 | * @ref: kref pointer of the backbone gw | |
160 | */ | |
161 | static void batadv_backbone_gw_release(struct kref *ref) | |
162 | { | |
163 | struct batadv_bla_backbone_gw *backbone_gw; | |
164 | ||
165 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
166 | refcount); | |
167 | ||
168 | kfree_rcu(backbone_gw, rcu); | |
169 | } | |
170 | ||
171 | /** | |
7e9a8c2c | 172 | * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
c8b86c12 | 173 | * release it |
04e14be6 SW |
174 | * @backbone_gw: backbone gateway to be free'd |
175 | */ | |
c8b86c12 | 176 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 177 | { |
06e56ded | 178 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
179 | } |
180 | ||
04e14be6 | 181 | /** |
7e9a8c2c SE |
182 | * batadv_claim_release() - release claim from lists and queue for free after |
183 | * rcu grace period | |
04e14be6 SW |
184 | * @ref: kref pointer of the claim |
185 | */ | |
71b7e3d3 | 186 | static void batadv_claim_release(struct kref *ref) |
23721387 | 187 | { |
71b7e3d3 | 188 | struct batadv_bla_claim *claim; |
3db0decf | 189 | struct batadv_bla_backbone_gw *old_backbone_gw; |
71b7e3d3 SE |
190 | |
191 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
192 | ||
3db0decf SE |
193 | spin_lock_bh(&claim->backbone_lock); |
194 | old_backbone_gw = claim->backbone_gw; | |
195 | claim->backbone_gw = NULL; | |
196 | spin_unlock_bh(&claim->backbone_lock); | |
197 | ||
198 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
199 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
200 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
201 | ||
202 | batadv_backbone_gw_put(old_backbone_gw); | |
203 | ||
63b39927 | 204 | kfree_rcu(claim, rcu); |
23721387 SW |
205 | } |
206 | ||
04e14be6 | 207 | /** |
7e9a8c2c | 208 | * batadv_claim_put() - decrement the claim refcounter and possibly 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 | /** |
7e9a8c2c | 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 | /** |
7e9a8c2c | 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 | 299 | /** |
7e9a8c2c | 300 | * batadv_bla_del_backbone_claims() - delete all claims for a backbone |
04e14be6 SW |
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 | 339 | /** |
7e9a8c2c | 340 | * batadv_bla_send_claim() - sends a claim frame according to the provided info |
2c53040f | 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, |
22f0502e | 397 | "%s(): CLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 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, |
22f0502e | 406 | "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 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, |
22f0502e | 415 | "%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
f7a2bd65 | 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, |
22f0502e | 426 | "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
5f80df67 | 427 | ethhdr->h_source, ethhdr->h_dest, |
f7a2bd65 | 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, | |
22f0502e SE |
433 | "%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
434 | __func__, ethhdr->h_source, ethhdr->h_dest, | |
f7a2bd65 | 435 | batadv_print_vid(vid)); |
cd9c7bfb SW |
436 | |
437 | break; | |
23721387 SW |
438 | } |
439 | ||
10c78f58 | 440 | if (vid & BATADV_VLAN_HAS_TAG) { |
eb2deb6b AQ |
441 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
442 | vid & VLAN_VID_MASK); | |
10c78f58 SE |
443 | if (!skb) |
444 | goto out; | |
445 | } | |
23721387 SW |
446 | |
447 | skb_reset_mac_header(skb); | |
448 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
449 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
450 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
451 | skb->len + ETH_HLEN); | |
23721387 SW |
452 | |
453 | netif_rx(skb); | |
454 | out: | |
455 | if (primary_if) | |
82047ad7 | 456 | batadv_hardif_put(primary_if); |
23721387 SW |
457 | } |
458 | ||
cd9c7bfb | 459 | /** |
7e9a8c2c | 460 | * batadv_bla_loopdetect_report() - worker for reporting the loop |
cd9c7bfb SW |
461 | * @work: work queue item |
462 | * | |
463 | * Throws an uevent, as the loopdetect check function can't do that itself | |
464 | * since the kernel may sleep while throwing uevents. | |
465 | */ | |
466 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
467 | { | |
468 | struct batadv_bla_backbone_gw *backbone_gw; | |
469 | struct batadv_priv *bat_priv; | |
470 | char vid_str[6] = { '\0' }; | |
471 | ||
472 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
473 | report_work); | |
474 | bat_priv = backbone_gw->bat_priv; | |
475 | ||
476 | batadv_info(bat_priv->soft_iface, | |
477 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
f7a2bd65 | 478 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb | 479 | snprintf(vid_str, sizeof(vid_str), "%d", |
f7a2bd65 | 480 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb SW |
481 | vid_str[sizeof(vid_str) - 1] = 0; |
482 | ||
483 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
484 | vid_str); | |
485 | ||
486 | batadv_backbone_gw_put(backbone_gw); | |
487 | } | |
488 | ||
2c53040f | 489 | /** |
7e9a8c2c | 490 | * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
2c53040f | 491 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
492 | * @orig: the mac address of the originator |
493 | * @vid: the VLAN ID | |
e3357189 | 494 | * @own_backbone: set if the requested backbone is local |
23721387 | 495 | * |
04e14be6 | 496 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 497 | */ |
bae98774 | 498 | static struct batadv_bla_backbone_gw * |
6b5e971a | 499 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 500 | unsigned short vid, bool own_backbone) |
23721387 | 501 | { |
bae98774 | 502 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 503 | struct batadv_orig_node *orig_node; |
23721387 SW |
504 | int hash_added; |
505 | ||
3b300de3 | 506 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
507 | |
508 | if (entry) | |
509 | return entry; | |
510 | ||
39c75a51 | 511 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 512 | "%s(): not found (%pM, %d), creating new entry\n", __func__, |
f7a2bd65 | 513 | orig, batadv_print_vid(vid)); |
23721387 SW |
514 | |
515 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
516 | if (!entry) | |
517 | return NULL; | |
518 | ||
519 | entry->vid = vid; | |
520 | entry->lasttime = jiffies; | |
3964f728 | 521 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 522 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 523 | spin_lock_init(&entry->crc_lock); |
23721387 | 524 | atomic_set(&entry->request_sent, 0); |
28709878 | 525 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 526 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 527 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
06e56ded | 528 | kref_init(&entry->refcount); |
23721387 | 529 | |
4e8389e1 | 530 | kref_get(&entry->refcount); |
807736f6 | 531 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
532 | batadv_compare_backbone_gw, |
533 | batadv_choose_backbone_gw, entry, | |
534 | &entry->hash_entry); | |
23721387 SW |
535 | |
536 | if (unlikely(hash_added != 0)) { | |
537 | /* hash failed, free the structure */ | |
538 | kfree(entry); | |
539 | return NULL; | |
540 | } | |
541 | ||
95fb130d | 542 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 543 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 544 | if (orig_node) { |
95fb130d | 545 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 546 | "became a backbone gateway"); |
5d967310 | 547 | batadv_orig_node_put(orig_node); |
20ff9d59 | 548 | } |
52aebd6a | 549 | |
d807f272 | 550 | if (own_backbone) { |
52aebd6a SW |
551 | batadv_bla_send_announce(bat_priv, entry); |
552 | ||
d807f272 SW |
553 | /* this will be decreased in the worker thread */ |
554 | atomic_inc(&entry->request_sent); | |
28709878 | 555 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
556 | atomic_inc(&bat_priv->bla.num_requests); |
557 | } | |
558 | ||
23721387 SW |
559 | return entry; |
560 | } | |
561 | ||
04e14be6 | 562 | /** |
7e9a8c2c | 563 | * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN |
04e14be6 SW |
564 | * @bat_priv: the bat priv with all the soft interface information |
565 | * @primary_if: the selected primary interface | |
566 | * @vid: VLAN identifier | |
567 | * | |
568 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
569 | * where we receive other backbone gws |
570 | */ | |
56303d34 SE |
571 | static void |
572 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
573 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 574 | unsigned short vid) |
23721387 | 575 | { |
bae98774 | 576 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 577 | |
3b300de3 SE |
578 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
579 | primary_if->net_dev->dev_addr, | |
52aebd6a | 580 | vid, true); |
23721387 SW |
581 | if (unlikely(!backbone_gw)) |
582 | return; | |
583 | ||
584 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 585 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
586 | } |
587 | ||
1b371d13 | 588 | /** |
7e9a8c2c | 589 | * batadv_bla_answer_request() - answer a bla request by sending own claims |
1b371d13 | 590 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 591 | * @primary_if: interface where the request came on |
23721387 SW |
592 | * @vid: the vid where the request came on |
593 | * | |
594 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
595 | * to allow the requester another check if the CRC is correct now. | |
596 | */ | |
56303d34 SE |
597 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
598 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 599 | unsigned short vid) |
23721387 | 600 | { |
23721387 | 601 | struct hlist_head *head; |
5bf74e9c | 602 | struct batadv_hashtable *hash; |
712bbfe4 | 603 | struct batadv_bla_claim *claim; |
bae98774 | 604 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
605 | int i; |
606 | ||
39c75a51 | 607 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
608 | "%s(): received a claim request, send all of our own claims again\n", |
609 | __func__); | |
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 | 638 | /** |
7e9a8c2c | 639 | * batadv_bla_send_request() - send a request to repeat claims |
1b371d13 | 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 | /** |
7e9a8c2c | 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 | 686 | /** |
7e9a8c2c | 687 | * batadv_bla_add_claim() - Adds a claim in the claim hash |
2c53040f | 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, |
22f0502e SE |
722 | "%s(): adding new entry %pM, vid %d to hash ...\n", |
723 | __func__, 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, |
22f0502e SE |
743 | "%s(): changing ownership for %pM, vid %d to gw %pM\n", |
744 | __func__, mac, batadv_print_vid(vid), | |
745 | backbone_gw->orig); | |
23721387 | 746 | |
3db0decf | 747 | remove_crc = true; |
23721387 | 748 | } |
3db0decf SE |
749 | |
750 | /* replace backbone_gw atomically and adjust reference counters */ | |
751 | spin_lock_bh(&claim->backbone_lock); | |
752 | old_backbone_gw = claim->backbone_gw; | |
06e56ded | 753 | kref_get(&backbone_gw->refcount); |
23721387 | 754 | claim->backbone_gw = backbone_gw; |
3db0decf | 755 | spin_unlock_bh(&claim->backbone_lock); |
23721387 | 756 | |
3db0decf SE |
757 | if (remove_crc) { |
758 | /* remove claim address from old backbone_gw */ | |
759 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
760 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
761 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
762 | } | |
23721387 | 763 | |
3db0decf SE |
764 | batadv_backbone_gw_put(old_backbone_gw); |
765 | ||
766 | /* add claim address to new backbone_gw */ | |
5a1dd8a4 | 767 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 768 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 769 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
770 | backbone_gw->lasttime = jiffies; |
771 | ||
772 | claim_free_ref: | |
321e3e08 | 773 | batadv_claim_put(claim); |
23721387 SW |
774 | } |
775 | ||
3db0decf | 776 | /** |
7e9a8c2c | 777 | * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of |
3db0decf SE |
778 | * claim |
779 | * @claim: claim whose backbone_gw should be returned | |
780 | * | |
781 | * Return: valid reference to claim::backbone_gw | |
782 | */ | |
783 | static struct batadv_bla_backbone_gw * | |
784 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) | |
785 | { | |
786 | struct batadv_bla_backbone_gw *backbone_gw; | |
787 | ||
788 | spin_lock_bh(&claim->backbone_lock); | |
789 | backbone_gw = claim->backbone_gw; | |
790 | kref_get(&backbone_gw->refcount); | |
791 | spin_unlock_bh(&claim->backbone_lock); | |
792 | ||
793 | return backbone_gw; | |
794 | } | |
795 | ||
04e14be6 | 796 | /** |
7e9a8c2c | 797 | * batadv_bla_del_claim() - delete a claim from the claim hash |
04e14be6 SW |
798 | * @bat_priv: the bat priv with all the soft interface information |
799 | * @mac: mac address of the claim to be removed | |
800 | * @vid: VLAN id for the claim to be removed | |
23721387 | 801 | */ |
56303d34 | 802 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 803 | const u8 *mac, const unsigned short vid) |
23721387 | 804 | { |
712bbfe4 | 805 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 806 | |
8fdd0153 | 807 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 808 | search_claim.vid = vid; |
3b300de3 | 809 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
810 | if (!claim) |
811 | return; | |
812 | ||
22f0502e | 813 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, |
f7a2bd65 | 814 | mac, batadv_print_vid(vid)); |
23721387 | 815 | |
807736f6 | 816 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 | 817 | batadv_choose_claim, claim); |
321e3e08 | 818 | batadv_claim_put(claim); /* reference from the hash is gone */ |
23721387 | 819 | |
23721387 | 820 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 821 | batadv_claim_put(claim); |
23721387 SW |
822 | } |
823 | ||
62fe710f | 824 | /** |
7e9a8c2c | 825 | * batadv_handle_announce() - check for ANNOUNCE frame |
04e14be6 SW |
826 | * @bat_priv: the bat priv with all the soft interface information |
827 | * @an_addr: announcement mac address (ARP Sender HW address) | |
828 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
829 | * @vid: the VLAN ID of the frame | |
62fe710f | 830 | * |
4b426b10 | 831 | * Return: true if handled |
62fe710f | 832 | */ |
4b426b10 SE |
833 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
834 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 835 | { |
bae98774 | 836 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 837 | u16 backbone_crc, crc; |
23721387 | 838 | |
3b300de3 | 839 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 840 | return false; |
23721387 | 841 | |
52aebd6a SW |
842 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
843 | false); | |
23721387 SW |
844 | |
845 | if (unlikely(!backbone_gw)) | |
4b426b10 | 846 | return true; |
23721387 | 847 | |
23721387 SW |
848 | /* handle as ANNOUNCE frame */ |
849 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 850 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 851 | |
39c75a51 | 852 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
853 | "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
854 | __func__, batadv_print_vid(vid), backbone_gw->orig, crc); | |
23721387 | 855 | |
5a1dd8a4 SW |
856 | spin_lock_bh(&backbone_gw->crc_lock); |
857 | backbone_crc = backbone_gw->crc; | |
858 | spin_unlock_bh(&backbone_gw->crc_lock); | |
859 | ||
860 | if (backbone_crc != crc) { | |
39c75a51 | 861 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
862 | "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
863 | __func__, backbone_gw->orig, | |
f7a2bd65 | 864 | batadv_print_vid(backbone_gw->vid), |
5a1dd8a4 | 865 | backbone_crc, crc); |
23721387 | 866 | |
3b300de3 | 867 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
868 | } else { |
869 | /* if we have sent a request and the crc was OK, | |
870 | * we can allow traffic again. | |
871 | */ | |
872 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 873 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
874 | atomic_set(&backbone_gw->request_sent, 0); |
875 | } | |
876 | } | |
877 | ||
c8b86c12 | 878 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 879 | return true; |
23721387 SW |
880 | } |
881 | ||
62fe710f | 882 | /** |
7e9a8c2c | 883 | * batadv_handle_request() - check for REQUEST frame |
04e14be6 SW |
884 | * @bat_priv: the bat priv with all the soft interface information |
885 | * @primary_if: the primary hard interface of this batman soft interface | |
886 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
887 | * @ethhdr: ethernet header of a packet | |
888 | * @vid: the VLAN ID of the frame | |
62fe710f | 889 | * |
4b426b10 | 890 | * Return: true if handled |
62fe710f | 891 | */ |
4b426b10 SE |
892 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
893 | struct batadv_hard_iface *primary_if, | |
894 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
895 | unsigned short vid) | |
23721387 SW |
896 | { |
897 | /* check for REQUEST frame */ | |
1eda58bf | 898 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 899 | return false; |
23721387 SW |
900 | |
901 | /* sanity check, this should not happen on a normal switch, | |
902 | * we ignore it in this case. | |
903 | */ | |
1eda58bf | 904 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 905 | return true; |
23721387 | 906 | |
39c75a51 | 907 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
908 | "%s(): REQUEST vid %d (sent by %pM)...\n", |
909 | __func__, batadv_print_vid(vid), ethhdr->h_source); | |
23721387 | 910 | |
3b300de3 | 911 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 912 | return true; |
23721387 SW |
913 | } |
914 | ||
62fe710f | 915 | /** |
7e9a8c2c | 916 | * batadv_handle_unclaim() - check for UNCLAIM frame |
04e14be6 SW |
917 | * @bat_priv: the bat priv with all the soft interface information |
918 | * @primary_if: the primary hard interface of this batman soft interface | |
919 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
920 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
921 | * @vid: the VLAN ID of the frame | |
62fe710f | 922 | * |
4b426b10 | 923 | * Return: true if handled |
62fe710f | 924 | */ |
4b426b10 SE |
925 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
926 | struct batadv_hard_iface *primary_if, | |
927 | u8 *backbone_addr, u8 *claim_addr, | |
928 | unsigned short vid) | |
23721387 | 929 | { |
bae98774 | 930 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
931 | |
932 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
933 | if (primary_if && batadv_compare_eth(backbone_addr, |
934 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 935 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 936 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 937 | |
3b300de3 | 938 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
939 | |
940 | if (!backbone_gw) | |
4b426b10 | 941 | return true; |
23721387 SW |
942 | |
943 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 944 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 945 | "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, |
f7a2bd65 | 946 | claim_addr, batadv_print_vid(vid), backbone_gw->orig); |
23721387 | 947 | |
3b300de3 | 948 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 949 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 950 | return true; |
23721387 SW |
951 | } |
952 | ||
62fe710f | 953 | /** |
7e9a8c2c | 954 | * batadv_handle_claim() - check for CLAIM frame |
04e14be6 SW |
955 | * @bat_priv: the bat priv with all the soft interface information |
956 | * @primary_if: the primary hard interface of this batman soft interface | |
957 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
958 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
959 | * @vid: the VLAN ID of the frame | |
62fe710f | 960 | * |
4b426b10 | 961 | * Return: true if handled |
62fe710f | 962 | */ |
4b426b10 SE |
963 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
964 | struct batadv_hard_iface *primary_if, | |
965 | u8 *backbone_addr, u8 *claim_addr, | |
966 | unsigned short vid) | |
23721387 | 967 | { |
bae98774 | 968 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
969 | |
970 | /* register the gateway if not yet available, and add the claim. */ | |
971 | ||
52aebd6a SW |
972 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
973 | false); | |
23721387 SW |
974 | |
975 | if (unlikely(!backbone_gw)) | |
4b426b10 | 976 | return true; |
23721387 SW |
977 | |
978 | /* this must be a CLAIM frame */ | |
3b300de3 | 979 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 980 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 981 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 982 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
983 | |
984 | /* TODO: we could call something like tt_local_del() here. */ | |
985 | ||
c8b86c12 | 986 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 987 | return true; |
23721387 SW |
988 | } |
989 | ||
2c53040f | 990 | /** |
7e9a8c2c | 991 | * batadv_check_claim_group() - check for claim group membership |
2c53040f | 992 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 993 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
994 | * @hw_src: the Hardware source in the ARP Header |
995 | * @hw_dst: the Hardware destination in the ARP Header | |
996 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
997 | * | |
998 | * checks if it is a claim packet and if its on the same group. | |
999 | * This function also applies the group ID of the sender | |
1000 | * if it is in the same mesh. | |
1001 | * | |
62fe710f | 1002 | * Return: |
38ef3d1d SW |
1003 | * 2 - if it is a claim packet and on the same group |
1004 | * 1 - if is a claim packet from another group | |
1005 | * 0 - if it is not a claim packet | |
1006 | */ | |
56303d34 SE |
1007 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1008 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1009 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1010 | struct ethhdr *ethhdr) |
38ef3d1d | 1011 | { |
6b5e971a | 1012 | u8 *backbone_addr; |
56303d34 | 1013 | struct batadv_orig_node *orig_node; |
96412690 | 1014 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1015 | |
96412690 | 1016 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1017 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1018 | |
38ef3d1d SW |
1019 | /* if announcement packet, use the source, |
1020 | * otherwise assume it is in the hw_src | |
1021 | */ | |
1022 | switch (bla_dst->type) { | |
3eb8773e | 1023 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1024 | backbone_addr = hw_src; |
1025 | break; | |
acd34afa SE |
1026 | case BATADV_CLAIM_TYPE_REQUEST: |
1027 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1028 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1029 | backbone_addr = ethhdr->h_source; |
1030 | break; | |
1031 | default: | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1036 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1037 | return 0; |
1038 | ||
1039 | /* if its already the same group, it is fine. */ | |
1040 | if (bla_dst->group == bla_dst_own->group) | |
1041 | return 2; | |
1042 | ||
1043 | /* lets see if this originator is in our mesh */ | |
da641193 | 1044 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
1045 | |
1046 | /* dont accept claims from gateways which are not in | |
1047 | * the same mesh or group. | |
1048 | */ | |
1049 | if (!orig_node) | |
1050 | return 1; | |
1051 | ||
1052 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1053 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1054 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1055 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1056 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1057 | bla_dst_own->group = bla_dst->group; |
1058 | } | |
1059 | ||
5d967310 | 1060 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1061 | |
1062 | return 2; | |
1063 | } | |
1064 | ||
1b371d13 | 1065 | /** |
7e9a8c2c | 1066 | * batadv_bla_process_claim() - Check if this is a claim frame, and process it |
1b371d13 | 1067 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1068 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1069 | * @skb: the frame to be checked |
1070 | * | |
4b426b10 | 1071 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1072 | * tell the callee that it can use the frame on its own. |
1073 | */ | |
4b426b10 SE |
1074 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1075 | struct batadv_hard_iface *primary_if, | |
1076 | struct sk_buff *skb) | |
23721387 | 1077 | { |
d46b6bfa | 1078 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1079 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1080 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1081 | struct ethhdr *ethhdr; |
23721387 | 1082 | struct arphdr *arphdr; |
c018ad3d | 1083 | unsigned short vid; |
d46b6bfa | 1084 | int vlan_depth = 0; |
293e9338 | 1085 | __be16 proto; |
23721387 | 1086 | int headlen; |
38ef3d1d | 1087 | int ret; |
23721387 | 1088 | |
c018ad3d | 1089 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1090 | ethhdr = eth_hdr(skb); |
23721387 | 1091 | |
c018ad3d AQ |
1092 | proto = ethhdr->h_proto; |
1093 | headlen = ETH_HLEN; | |
1094 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1095 | /* Traverse the VLAN/Ethertypes. |
1096 | * | |
1097 | * At this point it is known that the first protocol is a VLAN | |
1098 | * header, so start checking at the encapsulated protocol. | |
1099 | * | |
1100 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1101 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1102 | */ | |
1103 | do { | |
1104 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1105 | &vhdr_buf); | |
1106 | if (!vhdr) | |
4b426b10 | 1107 | return false; |
d46b6bfa SW |
1108 | |
1109 | proto = vhdr->h_vlan_encapsulated_proto; | |
1110 | headlen += VLAN_HLEN; | |
1111 | vlan_depth++; | |
1112 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1113 | } |
1114 | ||
293e9338 | 1115 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1116 | return false; /* not a claim frame */ |
23721387 SW |
1117 | |
1118 | /* this must be a ARP frame. check if it is a claim. */ | |
1119 | ||
1120 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1121 | return false; |
23721387 SW |
1122 | |
1123 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1124 | ethhdr = eth_hdr(skb); |
6b5e971a | 1125 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1126 | |
1127 | /* Check whether the ARP frame carries a valid | |
1128 | * IP information | |
1129 | */ | |
23721387 | 1130 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1131 | return false; |
23721387 | 1132 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1133 | return false; |
23721387 | 1134 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1135 | return false; |
23721387 | 1136 | if (arphdr->ar_pln != 4) |
4b426b10 | 1137 | return false; |
23721387 | 1138 | |
6b5e971a | 1139 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1140 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1141 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1142 | bla_dst_own = &bat_priv->bla.claim_dest; |
1143 | ||
1144 | /* check if it is a claim frame in general */ | |
1145 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1146 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1147 | return false; |
d46b6bfa SW |
1148 | |
1149 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1150 | * drop that, as this is not supported by BLA but should also not be | |
1151 | * sent via the mesh. | |
1152 | */ | |
1153 | if (vlan_depth > 1) | |
4b426b10 | 1154 | return true; |
23721387 | 1155 | |
cd9c7bfb SW |
1156 | /* Let the loopdetect frames on the mesh in any case. */ |
1157 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1158 | return false; |
cd9c7bfb | 1159 | |
23721387 | 1160 | /* check if it is a claim frame. */ |
3b300de3 SE |
1161 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1162 | ethhdr); | |
38ef3d1d | 1163 | if (ret == 1) |
39c75a51 | 1164 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1165 | "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1166 | __func__, ethhdr->h_source, batadv_print_vid(vid), | |
1167 | hw_src, hw_dst); | |
38ef3d1d SW |
1168 | |
1169 | if (ret < 2) | |
4b426b10 | 1170 | return !!ret; |
23721387 SW |
1171 | |
1172 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1173 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1174 | |
1175 | /* check for the different types of claim frames ... */ | |
1176 | switch (bla_dst->type) { | |
3eb8773e | 1177 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1178 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1179 | ethhdr->h_source, vid)) | |
4b426b10 | 1180 | return true; |
23721387 | 1181 | break; |
3eb8773e | 1182 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1183 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1184 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1185 | return true; |
23721387 SW |
1186 | break; |
1187 | ||
acd34afa | 1188 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1189 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1190 | vid)) | |
4b426b10 | 1191 | return true; |
23721387 | 1192 | break; |
acd34afa | 1193 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1194 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1195 | vid)) | |
4b426b10 | 1196 | return true; |
23721387 SW |
1197 | break; |
1198 | } | |
1199 | ||
39c75a51 | 1200 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1201 | "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1202 | __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, | |
1203 | hw_dst); | |
4b426b10 | 1204 | return true; |
23721387 SW |
1205 | } |
1206 | ||
04e14be6 | 1207 | /** |
7e9a8c2c | 1208 | * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or |
04e14be6 SW |
1209 | * immediately |
1210 | * @bat_priv: the bat priv with all the soft interface information | |
1211 | * @now: whether the whole hash shall be wiped now | |
1212 | * | |
1213 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1214 | * a time out, or clean all backbone gws if now is set. |
1215 | */ | |
56303d34 | 1216 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1217 | { |
bae98774 | 1218 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1219 | struct hlist_node *node_tmp; |
23721387 | 1220 | struct hlist_head *head; |
5bf74e9c | 1221 | struct batadv_hashtable *hash; |
23721387 SW |
1222 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1223 | int i; | |
1224 | ||
807736f6 | 1225 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1226 | if (!hash) |
1227 | return; | |
1228 | ||
1229 | for (i = 0; i < hash->size; i++) { | |
1230 | head = &hash->table[i]; | |
1231 | list_lock = &hash->list_locks[i]; | |
1232 | ||
1233 | spin_lock_bh(list_lock); | |
b67bfe0d | 1234 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1235 | head, hash_entry) { |
1236 | if (now) | |
1237 | goto purge_now; | |
1eda58bf | 1238 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1239 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1240 | continue; |
1241 | ||
39c75a51 | 1242 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
1243 | "%s(): backbone gw %pM timed out\n", |
1244 | __func__, backbone_gw->orig); | |
23721387 SW |
1245 | |
1246 | purge_now: | |
1247 | /* don't wait for the pending request anymore */ | |
1248 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1249 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1250 | |
3b300de3 | 1251 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1252 | |
b67bfe0d | 1253 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1254 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1255 | } |
1256 | spin_unlock_bh(list_lock); | |
1257 | } | |
1258 | } | |
1259 | ||
2c53040f | 1260 | /** |
7e9a8c2c | 1261 | * batadv_bla_purge_claims() - Remove claims after a timeout or immediately |
2c53040f | 1262 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1263 | * @primary_if: the selected primary interface, may be NULL if now is set |
1264 | * @now: whether the whole hash shall be wiped now | |
1265 | * | |
1266 | * Check when we heard last time from our own claims, and remove them in case of | |
1267 | * a time out, or clean all claims if now is set | |
1268 | */ | |
56303d34 SE |
1269 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1270 | struct batadv_hard_iface *primary_if, | |
1271 | int now) | |
23721387 | 1272 | { |
3db0decf | 1273 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1274 | struct batadv_bla_claim *claim; |
23721387 | 1275 | struct hlist_head *head; |
5bf74e9c | 1276 | struct batadv_hashtable *hash; |
23721387 SW |
1277 | int i; |
1278 | ||
807736f6 | 1279 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1280 | if (!hash) |
1281 | return; | |
1282 | ||
1283 | for (i = 0; i < hash->size; i++) { | |
1284 | head = &hash->table[i]; | |
1285 | ||
1286 | rcu_read_lock(); | |
b67bfe0d | 1287 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1288 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1289 | if (now) |
1290 | goto purge_now; | |
3db0decf SE |
1291 | |
1292 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1293 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1294 | goto skip; |
1295 | ||
1eda58bf | 1296 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1297 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1298 | goto skip; |
23721387 | 1299 | |
39c75a51 | 1300 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1301 | "%s(): timed out.\n", __func__); |
23721387 SW |
1302 | |
1303 | purge_now: | |
4dd72f73 | 1304 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1305 | "%s(): %pM, vid %d\n", __func__, |
4dd72f73 AP |
1306 | claim->addr, claim->vid); |
1307 | ||
3b300de3 | 1308 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1309 | backbone_gw->orig, |
3b300de3 | 1310 | claim->addr, claim->vid); |
3db0decf SE |
1311 | skip: |
1312 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1313 | } |
1314 | rcu_read_unlock(); | |
1315 | } | |
1316 | } | |
1317 | ||
2c53040f | 1318 | /** |
7e9a8c2c | 1319 | * batadv_bla_update_orig_address() - Update the backbone gateways when the own |
04e14be6 | 1320 | * originator address changes |
2c53040f | 1321 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1322 | * @primary_if: the new selected primary_if |
1323 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1324 | */ |
56303d34 SE |
1325 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1326 | struct batadv_hard_iface *primary_if, | |
1327 | struct batadv_hard_iface *oldif) | |
23721387 | 1328 | { |
bae98774 | 1329 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1330 | struct hlist_head *head; |
5bf74e9c | 1331 | struct batadv_hashtable *hash; |
807736f6 | 1332 | __be16 group; |
23721387 SW |
1333 | int i; |
1334 | ||
38ef3d1d | 1335 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1336 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1337 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1338 | |
d5b4c93e SW |
1339 | /* purge everything when bridge loop avoidance is turned off */ |
1340 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1341 | oldif = NULL; | |
1342 | ||
23721387 | 1343 | if (!oldif) { |
3b300de3 SE |
1344 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1345 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1346 | return; |
1347 | } | |
1348 | ||
807736f6 | 1349 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1350 | if (!hash) |
1351 | return; | |
1352 | ||
1353 | for (i = 0; i < hash->size; i++) { | |
1354 | head = &hash->table[i]; | |
1355 | ||
1356 | rcu_read_lock(); | |
b67bfe0d | 1357 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1358 | /* own orig still holds the old value. */ |
1eda58bf SE |
1359 | if (!batadv_compare_eth(backbone_gw->orig, |
1360 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1361 | continue; |
1362 | ||
8fdd0153 AQ |
1363 | ether_addr_copy(backbone_gw->orig, |
1364 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1365 | /* send an announce frame so others will ask for our |
1366 | * claims and update their tables. | |
1367 | */ | |
3b300de3 | 1368 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1369 | } |
1370 | rcu_read_unlock(); | |
1371 | } | |
1372 | } | |
1373 | ||
cd9c7bfb | 1374 | /** |
7e9a8c2c | 1375 | * batadv_bla_send_loopdetect() - send a loopdetect frame |
cd9c7bfb SW |
1376 | * @bat_priv: the bat priv with all the soft interface information |
1377 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1378 | * | |
1379 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1380 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1381 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1382 | * indicates that there is a loop. | |
1383 | */ | |
1384 | static void | |
1385 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1386 | struct batadv_bla_backbone_gw *backbone_gw) | |
1387 | { | |
1388 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1389 | backbone_gw->vid); | |
1390 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1391 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1392 | } | |
1393 | ||
d68081a2 | 1394 | /** |
7e9a8c2c | 1395 | * batadv_bla_status_update() - purge bla interfaces if necessary |
d68081a2 SW |
1396 | * @net_dev: the soft interface net device |
1397 | */ | |
1398 | void batadv_bla_status_update(struct net_device *net_dev) | |
1399 | { | |
1400 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1401 | struct batadv_hard_iface *primary_if; | |
1402 | ||
1403 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1404 | if (!primary_if) | |
1405 | return; | |
1406 | ||
1407 | /* this function already purges everything when bla is disabled, | |
1408 | * so just call that one. | |
1409 | */ | |
1410 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1411 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1412 | } |
1413 | ||
04e14be6 | 1414 | /** |
7e9a8c2c | 1415 | * batadv_bla_periodic_work() - performs periodic bla work |
04e14be6 SW |
1416 | * @work: kernel work struct |
1417 | * | |
1418 | * periodic work to do: | |
23721387 SW |
1419 | * * purge structures when they are too old |
1420 | * * send announcements | |
1421 | */ | |
3b300de3 | 1422 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1423 | { |
bbb1f90e | 1424 | struct delayed_work *delayed_work; |
56303d34 | 1425 | struct batadv_priv *bat_priv; |
807736f6 | 1426 | struct batadv_priv_bla *priv_bla; |
23721387 | 1427 | struct hlist_head *head; |
bae98774 | 1428 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1429 | struct batadv_hashtable *hash; |
56303d34 | 1430 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1431 | bool send_loopdetect = false; |
23721387 SW |
1432 | int i; |
1433 | ||
4ba4bc0f | 1434 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1435 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1436 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1437 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1438 | if (!primary_if) |
1439 | goto out; | |
1440 | ||
3b300de3 SE |
1441 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1442 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1443 | |
1444 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1445 | goto out; | |
1446 | ||
cd9c7bfb SW |
1447 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1448 | /* set a new random mac address for the next bridge loop | |
1449 | * detection frames. Set the locally administered bit to avoid | |
1450 | * collisions with users mac addresses. | |
1451 | */ | |
1452 | random_ether_addr(bat_priv->bla.loopdetect_addr); | |
1453 | bat_priv->bla.loopdetect_addr[0] = 0xba; | |
1454 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1455 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1456 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1457 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1458 | ||
1459 | /* mark for sending loop detect on all VLANs */ | |
1460 | send_loopdetect = true; | |
1461 | } | |
1462 | ||
807736f6 | 1463 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1464 | if (!hash) |
1465 | goto out; | |
1466 | ||
1467 | for (i = 0; i < hash->size; i++) { | |
1468 | head = &hash->table[i]; | |
1469 | ||
1470 | rcu_read_lock(); | |
b67bfe0d | 1471 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1472 | if (!batadv_compare_eth(backbone_gw->orig, |
1473 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1474 | continue; |
1475 | ||
1476 | backbone_gw->lasttime = jiffies; | |
1477 | ||
3b300de3 | 1478 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1479 | if (send_loopdetect) |
1480 | batadv_bla_send_loopdetect(bat_priv, | |
1481 | backbone_gw); | |
d807f272 SW |
1482 | |
1483 | /* request_sent is only set after creation to avoid | |
1484 | * problems when we are not yet known as backbone gw | |
1485 | * in the backbone. | |
1486 | * | |
28709878 SW |
1487 | * We can reset this now after we waited some periods |
1488 | * to give bridge forward delays and bla group forming | |
1489 | * some grace time. | |
d807f272 SW |
1490 | */ |
1491 | ||
1492 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1493 | continue; | |
1494 | ||
28709878 SW |
1495 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1496 | continue; | |
1497 | ||
d807f272 SW |
1498 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1499 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1500 | } |
1501 | rcu_read_unlock(); | |
1502 | } | |
1503 | out: | |
1504 | if (primary_if) | |
82047ad7 | 1505 | batadv_hardif_put(primary_if); |
23721387 | 1506 | |
72414442 AQ |
1507 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1508 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1509 | } |
1510 | ||
5d52dad2 SE |
1511 | /* The hash for claim and backbone hash receive the same key because they |
1512 | * are getting initialized by hash_new with the same key. Reinitializing | |
1513 | * them with to different keys to allow nested locking without generating | |
1514 | * lockdep warnings | |
1515 | */ | |
3b300de3 SE |
1516 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1517 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1518 | |
04e14be6 | 1519 | /** |
7e9a8c2c | 1520 | * batadv_bla_init() - initialize all bla structures |
04e14be6 SW |
1521 | * @bat_priv: the bat priv with all the soft interface information |
1522 | * | |
1523 | * Return: 0 on success, < 0 on error. | |
1524 | */ | |
56303d34 | 1525 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1526 | { |
fe2da6ff | 1527 | int i; |
6b5e971a | 1528 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1529 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1530 | u16 crc; |
807736f6 | 1531 | unsigned long entrytime; |
fe2da6ff | 1532 | |
7dac7b76 LL |
1533 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1534 | ||
39c75a51 | 1535 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1536 | |
38ef3d1d | 1537 | /* setting claim destination address */ |
807736f6 SE |
1538 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1539 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1540 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1541 | if (primary_if) { |
807736f6 SE |
1542 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1543 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1544 | batadv_hardif_put(primary_if); |
38ef3d1d | 1545 | } else { |
807736f6 | 1546 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1547 | } |
1548 | ||
fe2da6ff | 1549 | /* initialize the duplicate list */ |
807736f6 | 1550 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1551 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1552 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1553 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1554 | |
cd9c7bfb SW |
1555 | atomic_set(&bat_priv->bla.loopdetect_next, |
1556 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1557 | ||
807736f6 | 1558 | if (bat_priv->bla.claim_hash) |
5346c35e | 1559 | return 0; |
23721387 | 1560 | |
807736f6 SE |
1561 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1562 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1563 | |
807736f6 | 1564 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1565 | return -ENOMEM; |
23721387 | 1566 | |
807736f6 | 1567 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1568 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1569 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1570 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1571 | |
39c75a51 | 1572 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1573 | |
72414442 AQ |
1574 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1575 | ||
1576 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1577 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1578 | return 0; |
23721387 SW |
1579 | } |
1580 | ||
2c53040f | 1581 | /** |
7e9a8c2c | 1582 | * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. |
2c53040f | 1583 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1584 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1585 | * |
1586 | * check if it is on our broadcast list. Another gateway might | |
1587 | * have sent the same packet because it is connected to the same backbone, | |
1588 | * so we have to remove this duplicate. | |
1589 | * | |
1590 | * This is performed by checking the CRC, which will tell us | |
1591 | * with a good chance that it is the same packet. If it is furthermore | |
1592 | * sent by another host, drop it. We allow equal packets from | |
1593 | * the same host however as this might be intended. | |
04e14be6 | 1594 | * |
4b426b10 | 1595 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1596 | */ |
4b426b10 SE |
1597 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
1598 | struct sk_buff *skb) | |
fe2da6ff | 1599 | { |
4b426b10 | 1600 | int i, curr; |
004e86fc SW |
1601 | __be32 crc; |
1602 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1603 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1604 | bool ret = false; |
fe2da6ff | 1605 | |
004e86fc | 1606 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1607 | |
1608 | /* calculate the crc ... */ | |
004e86fc | 1609 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1610 | |
7dac7b76 LL |
1611 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1612 | ||
42d0b044 | 1613 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1614 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1615 | curr %= BATADV_DUPLIST_SIZE; | |
1616 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1617 | |
1618 | /* we can stop searching if the entry is too old ; | |
1619 | * later entries will be even older | |
1620 | */ | |
42d0b044 SE |
1621 | if (batadv_has_timed_out(entry->entrytime, |
1622 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1623 | break; |
1624 | ||
1625 | if (entry->crc != crc) | |
1626 | continue; | |
1627 | ||
1eda58bf | 1628 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1629 | continue; |
1630 | ||
1631 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1632 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1633 | */ |
4b426b10 | 1634 | ret = true; |
7dac7b76 | 1635 | goto out; |
fe2da6ff | 1636 | } |
7dac7b76 | 1637 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1638 | * and allow it, its the first occurrence. |
7dac7b76 | 1639 | */ |
807736f6 | 1640 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1641 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1642 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1643 | entry->crc = crc; |
1644 | entry->entrytime = jiffies; | |
8fdd0153 | 1645 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1646 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1647 | |
7dac7b76 LL |
1648 | out: |
1649 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1650 | ||
1651 | return ret; | |
fe2da6ff SW |
1652 | } |
1653 | ||
1b371d13 | 1654 | /** |
7e9a8c2c | 1655 | * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for |
04e14be6 | 1656 | * the VLAN identified by vid. |
1b371d13 | 1657 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1658 | * @orig: originator mac address |
cfd4f757 | 1659 | * @vid: VLAN identifier |
20ff9d59 | 1660 | * |
62fe710f | 1661 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1662 | */ |
6b5e971a | 1663 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1664 | unsigned short vid) |
20ff9d59 | 1665 | { |
807736f6 | 1666 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1667 | struct hlist_head *head; |
bae98774 | 1668 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1669 | int i; |
1670 | ||
1671 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1672 | return false; |
20ff9d59 SW |
1673 | |
1674 | if (!hash) | |
cfd4f757 | 1675 | return false; |
20ff9d59 SW |
1676 | |
1677 | for (i = 0; i < hash->size; i++) { | |
1678 | head = &hash->table[i]; | |
1679 | ||
1680 | rcu_read_lock(); | |
b67bfe0d | 1681 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1682 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1683 | backbone_gw->vid == vid) { | |
20ff9d59 | 1684 | rcu_read_unlock(); |
cfd4f757 | 1685 | return true; |
20ff9d59 SW |
1686 | } |
1687 | } | |
1688 | rcu_read_unlock(); | |
1689 | } | |
1690 | ||
cfd4f757 | 1691 | return false; |
20ff9d59 SW |
1692 | } |
1693 | ||
2c53040f | 1694 | /** |
7e9a8c2c | 1695 | * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN |
2c53040f | 1696 | * @skb: the frame to be checked |
23721387 SW |
1697 | * @orig_node: the orig_node of the frame |
1698 | * @hdr_size: maximum length of the frame | |
1699 | * | |
4b426b10 SE |
1700 | * Return: true if the orig_node is also a gateway on the soft interface, |
1701 | * otherwise it returns false. | |
23721387 | 1702 | */ |
4b426b10 SE |
1703 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1704 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1705 | { |
bae98774 | 1706 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1707 | unsigned short vid; |
23721387 SW |
1708 | |
1709 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1710 | return false; |
23721387 SW |
1711 | |
1712 | /* first, find out the vid. */ | |
0d125074 | 1713 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1714 | return false; |
23721387 | 1715 | |
c018ad3d | 1716 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1717 | |
1718 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1719 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1720 | orig_node->orig, vid); | |
23721387 | 1721 | if (!backbone_gw) |
4b426b10 | 1722 | return false; |
23721387 | 1723 | |
c8b86c12 | 1724 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1725 | return true; |
23721387 SW |
1726 | } |
1727 | ||
04e14be6 | 1728 | /** |
7e9a8c2c | 1729 | * batadv_bla_free() - free all bla structures |
04e14be6 SW |
1730 | * @bat_priv: the bat priv with all the soft interface information |
1731 | * | |
1732 | * for softinterface free or module unload | |
1733 | */ | |
56303d34 | 1734 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1735 | { |
56303d34 | 1736 | struct batadv_hard_iface *primary_if; |
23721387 | 1737 | |
807736f6 | 1738 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1739 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1740 | |
807736f6 | 1741 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1742 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1743 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1744 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1745 | } |
807736f6 | 1746 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1747 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1748 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1749 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1750 | } |
1751 | if (primary_if) | |
82047ad7 | 1752 | batadv_hardif_put(primary_if); |
23721387 SW |
1753 | } |
1754 | ||
cd9c7bfb | 1755 | /** |
7e9a8c2c | 1756 | * batadv_bla_loopdetect_check() - check and handle a detected loop |
cd9c7bfb SW |
1757 | * @bat_priv: the bat priv with all the soft interface information |
1758 | * @skb: the packet to check | |
1759 | * @primary_if: interface where the request came on | |
1760 | * @vid: the VLAN ID of the frame | |
1761 | * | |
1762 | * Checks if this packet is a loop detect frame which has been sent by us, | |
1763 | * throw an uevent and log the event if that is the case. | |
1764 | * | |
1765 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1766 | * otherwise. | |
1767 | */ | |
1768 | static bool | |
1769 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1770 | struct batadv_hard_iface *primary_if, | |
1771 | unsigned short vid) | |
1772 | { | |
1773 | struct batadv_bla_backbone_gw *backbone_gw; | |
1774 | struct ethhdr *ethhdr; | |
1775 | ||
1776 | ethhdr = eth_hdr(skb); | |
1777 | ||
1778 | /* Only check for the MAC address and skip more checks here for | |
1779 | * performance reasons - this function is on the hotpath, after all. | |
1780 | */ | |
1781 | if (!batadv_compare_eth(ethhdr->h_source, | |
1782 | bat_priv->bla.loopdetect_addr)) | |
1783 | return false; | |
1784 | ||
1785 | /* If the packet came too late, don't forward it on the mesh | |
1786 | * but don't consider that as loop. It might be a coincidence. | |
1787 | */ | |
1788 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1789 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1790 | return true; | |
1791 | ||
1792 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1793 | primary_if->net_dev->dev_addr, | |
1794 | vid, true); | |
1795 | if (unlikely(!backbone_gw)) | |
1796 | return true; | |
1797 | ||
1798 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); | |
1799 | /* backbone_gw is unreferenced in the report work function function */ | |
1800 | ||
1801 | return true; | |
1802 | } | |
1803 | ||
2c53040f | 1804 | /** |
7e9a8c2c | 1805 | * batadv_bla_rx() - check packets coming from the mesh. |
2c53040f | 1806 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1807 | * @skb: the frame to be checked |
1808 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1809 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1810 | * |
04e14be6 | 1811 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1812 | * * we have to race for a claim |
1813 | * * if the frame is allowed on the LAN | |
1814 | * | |
62fe710f SE |
1815 | * in these cases, the skb is further handled by this function |
1816 | * | |
4b426b10 SE |
1817 | * Return: true if handled, otherwise it returns false and the caller shall |
1818 | * further process the skb. | |
23721387 | 1819 | */ |
4b426b10 SE |
1820 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1821 | unsigned short vid, bool is_bcast) | |
23721387 | 1822 | { |
3db0decf | 1823 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1824 | struct ethhdr *ethhdr; |
712bbfe4 | 1825 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1826 | struct batadv_hard_iface *primary_if; |
3db0decf | 1827 | bool own_claim; |
4b426b10 | 1828 | bool ret; |
23721387 | 1829 | |
7ed4be95 | 1830 | ethhdr = eth_hdr(skb); |
23721387 | 1831 | |
e5d89254 | 1832 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1833 | if (!primary_if) |
1834 | goto handled; | |
1835 | ||
1836 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1837 | goto allow; | |
1838 | ||
cd9c7bfb SW |
1839 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1840 | goto handled; | |
1841 | ||
807736f6 | 1842 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1843 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1844 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1845 | goto handled; |
1846 | ||
8fdd0153 | 1847 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1848 | search_claim.vid = vid; |
3b300de3 | 1849 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1850 | |
1851 | if (!claim) { | |
1852 | /* possible optimization: race for a claim */ | |
1853 | /* No claim exists yet, claim it for us! | |
1854 | */ | |
4dd72f73 AP |
1855 | |
1856 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
1857 | "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", |
1858 | __func__, ethhdr->h_source, | |
4dd72f73 AP |
1859 | batadv_is_my_client(bat_priv, |
1860 | ethhdr->h_source, vid) ? | |
1861 | "yes" : "no"); | |
3b300de3 SE |
1862 | batadv_handle_claim(bat_priv, primary_if, |
1863 | primary_if->net_dev->dev_addr, | |
1864 | ethhdr->h_source, vid); | |
23721387 SW |
1865 | goto allow; |
1866 | } | |
1867 | ||
1868 | /* if it is our own claim ... */ | |
3db0decf SE |
1869 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1870 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1871 | primary_if->net_dev->dev_addr); | |
1872 | batadv_backbone_gw_put(backbone_gw); | |
1873 | ||
1874 | if (own_claim) { | |
23721387 SW |
1875 | /* ... allow it in any case */ |
1876 | claim->lasttime = jiffies; | |
1877 | goto allow; | |
1878 | } | |
1879 | ||
1880 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1881 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1882 | /* ... drop it. the responsible gateway is in charge. | |
1883 | * | |
1884 | * We need to check is_bcast because with the gateway | |
1885 | * feature, broadcasts (like DHCP requests) may be sent | |
1886 | * using a unicast packet type. | |
1887 | */ | |
23721387 SW |
1888 | goto handled; |
1889 | } else { | |
1890 | /* seems the client considers us as its best gateway. | |
1891 | * send a claim and update the claim table | |
1892 | * immediately. | |
1893 | */ | |
3b300de3 SE |
1894 | batadv_handle_claim(bat_priv, primary_if, |
1895 | primary_if->net_dev->dev_addr, | |
1896 | ethhdr->h_source, vid); | |
23721387 SW |
1897 | goto allow; |
1898 | } | |
1899 | allow: | |
3b300de3 | 1900 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1901 | ret = false; |
23721387 SW |
1902 | goto out; |
1903 | ||
1904 | handled: | |
1905 | kfree_skb(skb); | |
4b426b10 | 1906 | ret = true; |
23721387 SW |
1907 | |
1908 | out: | |
1909 | if (primary_if) | |
82047ad7 | 1910 | batadv_hardif_put(primary_if); |
23721387 | 1911 | if (claim) |
321e3e08 | 1912 | batadv_claim_put(claim); |
23721387 SW |
1913 | return ret; |
1914 | } | |
1915 | ||
2c53040f | 1916 | /** |
7e9a8c2c | 1917 | * batadv_bla_tx() - check packets going into the mesh |
2c53040f | 1918 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1919 | * @skb: the frame to be checked |
1920 | * @vid: the VLAN ID of the frame | |
1921 | * | |
04e14be6 | 1922 | * batadv_bla_tx checks if: |
23721387 SW |
1923 | * * a claim was received which has to be processed |
1924 | * * the frame is allowed on the mesh | |
1925 | * | |
62fe710f | 1926 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1927 | * |
1928 | * This call might reallocate skb data. | |
62fe710f | 1929 | * |
4b426b10 SE |
1930 | * Return: true if handled, otherwise it returns false and the caller shall |
1931 | * further process the skb. | |
23721387 | 1932 | */ |
4b426b10 SE |
1933 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1934 | unsigned short vid) | |
23721387 SW |
1935 | { |
1936 | struct ethhdr *ethhdr; | |
712bbfe4 | 1937 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 1938 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 1939 | struct batadv_hard_iface *primary_if; |
3db0decf | 1940 | bool client_roamed; |
4b426b10 | 1941 | bool ret = false; |
23721387 | 1942 | |
e5d89254 | 1943 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1944 | if (!primary_if) |
1945 | goto out; | |
1946 | ||
1947 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1948 | goto allow; | |
1949 | ||
3b300de3 | 1950 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1951 | goto handled; |
1952 | ||
7ed4be95 | 1953 | ethhdr = eth_hdr(skb); |
23721387 | 1954 | |
807736f6 | 1955 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1956 | /* don't allow broadcasts while requests are in flight */ |
1957 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1958 | goto handled; | |
1959 | ||
8fdd0153 | 1960 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1961 | search_claim.vid = vid; |
1962 | ||
3b300de3 | 1963 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1964 | |
1965 | /* if no claim exists, allow it. */ | |
1966 | if (!claim) | |
1967 | goto allow; | |
1968 | ||
1969 | /* check if we are responsible. */ | |
3db0decf SE |
1970 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1971 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
1972 | primary_if->net_dev->dev_addr); | |
1973 | batadv_backbone_gw_put(backbone_gw); | |
1974 | ||
1975 | if (client_roamed) { | |
23721387 SW |
1976 | /* if yes, the client has roamed and we have |
1977 | * to unclaim it. | |
1978 | */ | |
a3a5129e AP |
1979 | if (batadv_has_timed_out(claim->lasttime, 100)) { |
1980 | /* only unclaim if the last claim entry is | |
1981 | * older than 100 ms to make sure we really | |
1982 | * have a roaming client here. | |
1983 | */ | |
22f0502e SE |
1984 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", |
1985 | __func__, ethhdr->h_source); | |
a3a5129e AP |
1986 | batadv_handle_unclaim(bat_priv, primary_if, |
1987 | primary_if->net_dev->dev_addr, | |
1988 | ethhdr->h_source, vid); | |
1989 | goto allow; | |
1990 | } else { | |
22f0502e SE |
1991 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", |
1992 | __func__, ethhdr->h_source); | |
a3a5129e AP |
1993 | goto handled; |
1994 | } | |
23721387 SW |
1995 | } |
1996 | ||
1997 | /* check if it is a multicast/broadcast frame */ | |
1998 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1999 | /* drop it. the responsible gateway has forwarded it into | |
2000 | * the backbone network. | |
2001 | */ | |
2002 | goto handled; | |
2003 | } else { | |
2004 | /* we must allow it. at least if we are | |
2005 | * responsible for the DESTINATION. | |
2006 | */ | |
2007 | goto allow; | |
2008 | } | |
2009 | allow: | |
3b300de3 | 2010 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 2011 | ret = false; |
23721387 SW |
2012 | goto out; |
2013 | handled: | |
4b426b10 | 2014 | ret = true; |
23721387 SW |
2015 | out: |
2016 | if (primary_if) | |
82047ad7 | 2017 | batadv_hardif_put(primary_if); |
23721387 | 2018 | if (claim) |
321e3e08 | 2019 | batadv_claim_put(claim); |
23721387 SW |
2020 | return ret; |
2021 | } | |
9bf8e4d4 | 2022 | |
dc1cbd14 | 2023 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 | 2024 | /** |
7e9a8c2c | 2025 | * batadv_bla_claim_table_seq_print_text() - print the claim table in a seq file |
04e14be6 SW |
2026 | * @seq: seq file to print on |
2027 | * @offset: not used | |
2028 | * | |
2029 | * Return: always 0 | |
2030 | */ | |
08adf151 | 2031 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
2032 | { |
2033 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 2034 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 2035 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
3db0decf | 2036 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 2037 | struct batadv_bla_claim *claim; |
56303d34 | 2038 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 2039 | struct hlist_head *head; |
5a1dd8a4 | 2040 | u16 backbone_crc; |
6b5e971a | 2041 | u32 i; |
9bf8e4d4 | 2042 | bool is_own; |
6b5e971a | 2043 | u8 *primary_addr; |
9bf8e4d4 | 2044 | |
30da63a6 ML |
2045 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2046 | if (!primary_if) | |
9bf8e4d4 | 2047 | goto out; |
9bf8e4d4 | 2048 | |
1eda58bf | 2049 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 2050 | seq_printf(seq, |
39a32991 | 2051 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 2052 | net_dev->name, primary_addr, |
807736f6 | 2053 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 AQ |
2054 | seq_puts(seq, |
2055 | " Client VID Originator [o] (CRC )\n"); | |
9bf8e4d4 SW |
2056 | for (i = 0; i < hash->size; i++) { |
2057 | head = &hash->table[i]; | |
2058 | ||
2059 | rcu_read_lock(); | |
b67bfe0d | 2060 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf SE |
2061 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2062 | ||
2063 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 2064 | primary_addr); |
5a1dd8a4 | 2065 | |
3db0decf SE |
2066 | spin_lock_bh(&backbone_gw->crc_lock); |
2067 | backbone_crc = backbone_gw->crc; | |
2068 | spin_unlock_bh(&backbone_gw->crc_lock); | |
eb2deb6b | 2069 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
f7a2bd65 | 2070 | claim->addr, batadv_print_vid(claim->vid), |
3db0decf | 2071 | backbone_gw->orig, |
9bf8e4d4 | 2072 | (is_own ? 'x' : ' '), |
5a1dd8a4 | 2073 | backbone_crc); |
3db0decf SE |
2074 | |
2075 | batadv_backbone_gw_put(backbone_gw); | |
9bf8e4d4 SW |
2076 | } |
2077 | rcu_read_unlock(); | |
2078 | } | |
2079 | out: | |
2080 | if (primary_if) | |
82047ad7 | 2081 | batadv_hardif_put(primary_if); |
30da63a6 | 2082 | return 0; |
9bf8e4d4 | 2083 | } |
dc1cbd14 | 2084 | #endif |
536a23f1 | 2085 | |
04f3f5bf | 2086 | /** |
7e9a8c2c | 2087 | * batadv_bla_claim_dump_entry() - dump one entry of the claim table |
04f3f5bf AL |
2088 | * to a netlink socket |
2089 | * @msg: buffer for the message | |
2090 | * @portid: netlink port | |
2091 | * @seq: Sequence number of netlink message | |
2092 | * @primary_if: primary interface | |
2093 | * @claim: entry to dump | |
2094 | * | |
2095 | * Return: 0 or error code. | |
2096 | */ | |
2097 | static int | |
2098 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2099 | struct batadv_hard_iface *primary_if, | |
2100 | struct batadv_bla_claim *claim) | |
2101 | { | |
2102 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2103 | u16 backbone_crc; | |
2104 | bool is_own; | |
2105 | void *hdr; | |
2106 | int ret = -EINVAL; | |
2107 | ||
2108 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2109 | NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM); | |
2110 | if (!hdr) { | |
2111 | ret = -ENOBUFS; | |
2112 | goto out; | |
2113 | } | |
2114 | ||
2115 | is_own = batadv_compare_eth(claim->backbone_gw->orig, | |
2116 | primary_addr); | |
2117 | ||
2118 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
2119 | backbone_crc = claim->backbone_gw->crc; | |
2120 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
2121 | ||
2122 | if (is_own) | |
2123 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2124 | genlmsg_cancel(msg, hdr); | |
2125 | goto out; | |
2126 | } | |
2127 | ||
2128 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || | |
2129 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || | |
2130 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2131 | claim->backbone_gw->orig) || | |
2132 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2133 | backbone_crc)) { | |
2134 | genlmsg_cancel(msg, hdr); | |
2135 | goto out; | |
2136 | } | |
2137 | ||
2138 | genlmsg_end(msg, hdr); | |
2139 | ret = 0; | |
2140 | ||
2141 | out: | |
2142 | return ret; | |
2143 | } | |
2144 | ||
2145 | /** | |
7e9a8c2c | 2146 | * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table |
04f3f5bf AL |
2147 | * to a netlink socket |
2148 | * @msg: buffer for the message | |
2149 | * @portid: netlink port | |
2150 | * @seq: Sequence number of netlink message | |
2151 | * @primary_if: primary interface | |
2152 | * @head: bucket to dump | |
2153 | * @idx_skip: How many entries to skip | |
2154 | * | |
2155 | * Return: always 0. | |
2156 | */ | |
2157 | static int | |
2158 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2159 | struct batadv_hard_iface *primary_if, | |
2160 | struct hlist_head *head, int *idx_skip) | |
2161 | { | |
2162 | struct batadv_bla_claim *claim; | |
2163 | int idx = 0; | |
2164 | ||
2165 | rcu_read_lock(); | |
2166 | hlist_for_each_entry_rcu(claim, head, hash_entry) { | |
2167 | if (idx++ < *idx_skip) | |
2168 | continue; | |
2169 | if (batadv_bla_claim_dump_entry(msg, portid, seq, | |
2170 | primary_if, claim)) { | |
2171 | *idx_skip = idx - 1; | |
2172 | goto unlock; | |
2173 | } | |
2174 | } | |
2175 | ||
2176 | *idx_skip = idx; | |
2177 | unlock: | |
2178 | rcu_read_unlock(); | |
2179 | return 0; | |
2180 | } | |
2181 | ||
2182 | /** | |
7e9a8c2c | 2183 | * batadv_bla_claim_dump() - dump claim table to a netlink socket |
04f3f5bf AL |
2184 | * @msg: buffer for the message |
2185 | * @cb: callback structure containing arguments | |
2186 | * | |
2187 | * Return: message length. | |
2188 | */ | |
2189 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2190 | { | |
2191 | struct batadv_hard_iface *primary_if = NULL; | |
2192 | int portid = NETLINK_CB(cb->skb).portid; | |
2193 | struct net *net = sock_net(cb->skb->sk); | |
2194 | struct net_device *soft_iface; | |
2195 | struct batadv_hashtable *hash; | |
2196 | struct batadv_priv *bat_priv; | |
2197 | int bucket = cb->args[0]; | |
2198 | struct hlist_head *head; | |
2199 | int idx = cb->args[1]; | |
2200 | int ifindex; | |
2201 | int ret = 0; | |
2202 | ||
2203 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2204 | BATADV_ATTR_MESH_IFINDEX); | |
2205 | if (!ifindex) | |
2206 | return -EINVAL; | |
2207 | ||
2208 | soft_iface = dev_get_by_index(net, ifindex); | |
2209 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2210 | ret = -ENODEV; | |
2211 | goto out; | |
2212 | } | |
2213 | ||
2214 | bat_priv = netdev_priv(soft_iface); | |
2215 | hash = bat_priv->bla.claim_hash; | |
2216 | ||
2217 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2218 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2219 | ret = -ENOENT; | |
2220 | goto out; | |
2221 | } | |
2222 | ||
2223 | while (bucket < hash->size) { | |
2224 | head = &hash->table[bucket]; | |
2225 | ||
2226 | if (batadv_bla_claim_dump_bucket(msg, portid, | |
2227 | cb->nlh->nlmsg_seq, | |
2228 | primary_if, head, &idx)) | |
2229 | break; | |
2230 | bucket++; | |
2231 | } | |
2232 | ||
2233 | cb->args[0] = bucket; | |
2234 | cb->args[1] = idx; | |
2235 | ||
2236 | ret = msg->len; | |
2237 | ||
2238 | out: | |
2239 | if (primary_if) | |
2240 | batadv_hardif_put(primary_if); | |
2241 | ||
2242 | if (soft_iface) | |
2243 | dev_put(soft_iface); | |
2244 | ||
2245 | return ret; | |
2246 | } | |
2247 | ||
dc1cbd14 | 2248 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
04e14be6 | 2249 | /** |
7e9a8c2c SE |
2250 | * batadv_bla_backbone_table_seq_print_text() - print the backbone table in a |
2251 | * seq file | |
04e14be6 SW |
2252 | * @seq: seq file to print on |
2253 | * @offset: not used | |
2254 | * | |
2255 | * Return: always 0 | |
2256 | */ | |
536a23f1 SW |
2257 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
2258 | { | |
2259 | struct net_device *net_dev = (struct net_device *)seq->private; | |
2260 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 2261 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 2262 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 2263 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
2264 | struct hlist_head *head; |
2265 | int secs, msecs; | |
5a1dd8a4 | 2266 | u16 backbone_crc; |
6b5e971a | 2267 | u32 i; |
536a23f1 | 2268 | bool is_own; |
6b5e971a | 2269 | u8 *primary_addr; |
536a23f1 | 2270 | |
30da63a6 ML |
2271 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2272 | if (!primary_if) | |
536a23f1 | 2273 | goto out; |
536a23f1 SW |
2274 | |
2275 | primary_addr = primary_if->net_dev->dev_addr; | |
2276 | seq_printf(seq, | |
39a32991 | 2277 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 2278 | net_dev->name, primary_addr, |
807736f6 | 2279 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 | 2280 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
536a23f1 SW |
2281 | for (i = 0; i < hash->size; i++) { |
2282 | head = &hash->table[i]; | |
2283 | ||
2284 | rcu_read_lock(); | |
b67bfe0d | 2285 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
2286 | msecs = jiffies_to_msecs(jiffies - |
2287 | backbone_gw->lasttime); | |
2288 | secs = msecs / 1000; | |
2289 | msecs = msecs % 1000; | |
2290 | ||
2291 | is_own = batadv_compare_eth(backbone_gw->orig, | |
2292 | primary_addr); | |
2293 | if (is_own) | |
2294 | continue; | |
2295 | ||
5a1dd8a4 SW |
2296 | spin_lock_bh(&backbone_gw->crc_lock); |
2297 | backbone_crc = backbone_gw->crc; | |
2298 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2299 | ||
eb2deb6b | 2300 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 | 2301 | backbone_gw->orig, |
f7a2bd65 | 2302 | batadv_print_vid(backbone_gw->vid), secs, |
5a1dd8a4 | 2303 | msecs, backbone_crc); |
536a23f1 SW |
2304 | } |
2305 | rcu_read_unlock(); | |
2306 | } | |
2307 | out: | |
2308 | if (primary_if) | |
82047ad7 | 2309 | batadv_hardif_put(primary_if); |
30da63a6 | 2310 | return 0; |
536a23f1 | 2311 | } |
dc1cbd14 | 2312 | #endif |
ea4152e1 SW |
2313 | |
2314 | /** | |
7e9a8c2c SE |
2315 | * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a |
2316 | * netlink socket | |
ea4152e1 SW |
2317 | * @msg: buffer for the message |
2318 | * @portid: netlink port | |
2319 | * @seq: Sequence number of netlink message | |
2320 | * @primary_if: primary interface | |
2321 | * @backbone_gw: entry to dump | |
2322 | * | |
2323 | * Return: 0 or error code. | |
2324 | */ | |
2325 | static int | |
2326 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, | |
2327 | struct batadv_hard_iface *primary_if, | |
2328 | struct batadv_bla_backbone_gw *backbone_gw) | |
2329 | { | |
2330 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2331 | u16 backbone_crc; | |
2332 | bool is_own; | |
2333 | int msecs; | |
2334 | void *hdr; | |
2335 | int ret = -EINVAL; | |
2336 | ||
2337 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, | |
2338 | NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE); | |
2339 | if (!hdr) { | |
2340 | ret = -ENOBUFS; | |
2341 | goto out; | |
2342 | } | |
2343 | ||
2344 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); | |
2345 | ||
2346 | spin_lock_bh(&backbone_gw->crc_lock); | |
2347 | backbone_crc = backbone_gw->crc; | |
2348 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2349 | ||
2350 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); | |
2351 | ||
2352 | if (is_own) | |
2353 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2354 | genlmsg_cancel(msg, hdr); | |
2355 | goto out; | |
2356 | } | |
2357 | ||
2358 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2359 | backbone_gw->orig) || | |
2360 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || | |
2361 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2362 | backbone_crc) || | |
2363 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { | |
2364 | genlmsg_cancel(msg, hdr); | |
2365 | goto out; | |
2366 | } | |
2367 | ||
2368 | genlmsg_end(msg, hdr); | |
2369 | ret = 0; | |
2370 | ||
2371 | out: | |
2372 | return ret; | |
2373 | } | |
2374 | ||
2375 | /** | |
7e9a8c2c SE |
2376 | * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to |
2377 | * a netlink socket | |
ea4152e1 SW |
2378 | * @msg: buffer for the message |
2379 | * @portid: netlink port | |
2380 | * @seq: Sequence number of netlink message | |
2381 | * @primary_if: primary interface | |
2382 | * @head: bucket to dump | |
2383 | * @idx_skip: How many entries to skip | |
2384 | * | |
2385 | * Return: always 0. | |
2386 | */ | |
2387 | static int | |
2388 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, | |
2389 | struct batadv_hard_iface *primary_if, | |
2390 | struct hlist_head *head, int *idx_skip) | |
2391 | { | |
2392 | struct batadv_bla_backbone_gw *backbone_gw; | |
2393 | int idx = 0; | |
2394 | ||
2395 | rcu_read_lock(); | |
2396 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { | |
2397 | if (idx++ < *idx_skip) | |
2398 | continue; | |
2399 | if (batadv_bla_backbone_dump_entry(msg, portid, seq, | |
2400 | primary_if, backbone_gw)) { | |
2401 | *idx_skip = idx - 1; | |
2402 | goto unlock; | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | *idx_skip = idx; | |
2407 | unlock: | |
2408 | rcu_read_unlock(); | |
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | /** | |
7e9a8c2c | 2413 | * batadv_bla_backbone_dump() - dump backbone table to a netlink socket |
ea4152e1 SW |
2414 | * @msg: buffer for the message |
2415 | * @cb: callback structure containing arguments | |
2416 | * | |
2417 | * Return: message length. | |
2418 | */ | |
2419 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2420 | { | |
2421 | struct batadv_hard_iface *primary_if = NULL; | |
2422 | int portid = NETLINK_CB(cb->skb).portid; | |
2423 | struct net *net = sock_net(cb->skb->sk); | |
2424 | struct net_device *soft_iface; | |
2425 | struct batadv_hashtable *hash; | |
2426 | struct batadv_priv *bat_priv; | |
2427 | int bucket = cb->args[0]; | |
2428 | struct hlist_head *head; | |
2429 | int idx = cb->args[1]; | |
2430 | int ifindex; | |
2431 | int ret = 0; | |
2432 | ||
2433 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2434 | BATADV_ATTR_MESH_IFINDEX); | |
2435 | if (!ifindex) | |
2436 | return -EINVAL; | |
2437 | ||
2438 | soft_iface = dev_get_by_index(net, ifindex); | |
2439 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2440 | ret = -ENODEV; | |
2441 | goto out; | |
2442 | } | |
2443 | ||
2444 | bat_priv = netdev_priv(soft_iface); | |
2445 | hash = bat_priv->bla.backbone_hash; | |
2446 | ||
2447 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2448 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2449 | ret = -ENOENT; | |
2450 | goto out; | |
2451 | } | |
2452 | ||
2453 | while (bucket < hash->size) { | |
2454 | head = &hash->table[bucket]; | |
2455 | ||
2456 | if (batadv_bla_backbone_dump_bucket(msg, portid, | |
2457 | cb->nlh->nlmsg_seq, | |
2458 | primary_if, head, &idx)) | |
2459 | break; | |
2460 | bucket++; | |
2461 | } | |
2462 | ||
2463 | cb->args[0] = bucket; | |
2464 | cb->args[1] = idx; | |
2465 | ||
2466 | ret = msg->len; | |
2467 | ||
2468 | out: | |
2469 | if (primary_if) | |
2470 | batadv_hardif_put(primary_if); | |
2471 | ||
2472 | if (soft_iface) | |
2473 | dev_put(soft_iface); | |
2474 | ||
2475 | return ret; | |
2476 | } | |
00311de5 AP |
2477 | |
2478 | #ifdef CONFIG_BATMAN_ADV_DAT | |
2479 | /** | |
7e9a8c2c | 2480 | * batadv_bla_check_claim() - check if address is claimed |
00311de5 AP |
2481 | * |
2482 | * @bat_priv: the bat priv with all the soft interface information | |
2483 | * @addr: mac address of which the claim status is checked | |
2484 | * @vid: the VLAN ID | |
2485 | * | |
2486 | * addr is checked if this address is claimed by the local device itself. | |
2487 | * | |
2488 | * Return: true if bla is disabled or the mac is claimed by the device, | |
2489 | * false if the device addr is already claimed by another gateway | |
2490 | */ | |
2491 | bool batadv_bla_check_claim(struct batadv_priv *bat_priv, | |
2492 | u8 *addr, unsigned short vid) | |
2493 | { | |
2494 | struct batadv_bla_claim search_claim; | |
2495 | struct batadv_bla_claim *claim = NULL; | |
2496 | struct batadv_hard_iface *primary_if = NULL; | |
2497 | bool ret = true; | |
2498 | ||
2499 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
2500 | return ret; | |
2501 | ||
2502 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2503 | if (!primary_if) | |
2504 | return ret; | |
2505 | ||
2506 | /* First look if the mac address is claimed */ | |
2507 | ether_addr_copy(search_claim.addr, addr); | |
2508 | search_claim.vid = vid; | |
2509 | ||
2510 | claim = batadv_claim_hash_find(bat_priv, &search_claim); | |
2511 | ||
2512 | /* If there is a claim and we are not owner of the claim, | |
2513 | * return false. | |
2514 | */ | |
2515 | if (claim) { | |
2516 | if (!batadv_compare_eth(claim->backbone_gw->orig, | |
2517 | primary_if->net_dev->dev_addr)) | |
2518 | ret = false; | |
2519 | batadv_claim_put(claim); | |
2520 | } | |
2521 | ||
2522 | batadv_hardif_put(primary_if); | |
2523 | return ret; | |
2524 | } | |
2525 | #endif |