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