Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cfa55c6d | 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
23721387 SW |
3 | * |
4 | * Simon Wunderlich | |
23721387 SW |
5 | */ |
6 | ||
23721387 | 7 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 8 | #include "main.h" |
23721387 | 9 | |
1e2c2a4f SE |
10 | #include <linux/atomic.h> |
11 | #include <linux/byteorder/generic.h> | |
12 | #include <linux/compiler.h> | |
eb7da4f1 | 13 | #include <linux/container_of.h> |
23721387 | 14 | #include <linux/crc16.h> |
1e2c2a4f SE |
15 | #include <linux/errno.h> |
16 | #include <linux/etherdevice.h> | |
b92b94ac | 17 | #include <linux/gfp.h> |
23721387 | 18 | #include <linux/if_arp.h> |
1e2c2a4f | 19 | #include <linux/if_ether.h> |
23721387 | 20 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
21 | #include <linux/jhash.h> |
22 | #include <linux/jiffies.h> | |
23 | #include <linux/kernel.h> | |
06e56ded | 24 | #include <linux/kref.h> |
1e2c2a4f SE |
25 | #include <linux/list.h> |
26 | #include <linux/lockdep.h> | |
27 | #include <linux/netdevice.h> | |
04f3f5bf | 28 | #include <linux/netlink.h> |
1e2c2a4f SE |
29 | #include <linux/rculist.h> |
30 | #include <linux/rcupdate.h> | |
1e2c2a4f SE |
31 | #include <linux/skbuff.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/workqueue.h> | |
37 | #include <net/arp.h> | |
04f3f5bf AL |
38 | #include <net/genetlink.h> |
39 | #include <net/netlink.h> | |
40 | #include <net/sock.h> | |
fec149f5 | 41 | #include <uapi/linux/batadv_packet.h> |
04f3f5bf | 42 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f SE |
43 | |
44 | #include "hard-interface.h" | |
45 | #include "hash.h" | |
ba412080 | 46 | #include "log.h" |
04f3f5bf | 47 | #include "netlink.h" |
1e2c2a4f | 48 | #include "originator.h" |
04f3f5bf | 49 | #include "soft-interface.h" |
1e2c2a4f | 50 | #include "translation-table.h" |
23721387 | 51 | |
6b5e971a | 52 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 53 | |
3b300de3 | 54 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
55 | static void |
56 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
57 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 58 | |
62fe710f | 59 | /** |
7e9a8c2c | 60 | * batadv_choose_claim() - choose the right bucket for a claim. |
04e14be6 SW |
61 | * @data: data to hash |
62 | * @size: size of the hash table | |
62fe710f | 63 | * |
04e14be6 | 64 | * Return: the hash index of the claim |
62fe710f | 65 | */ |
6b5e971a | 66 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 67 | { |
712bbfe4 | 68 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 69 | u32 hash = 0; |
23721387 | 70 | |
36fd61cb SE |
71 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
72 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
73 | |
74 | return hash % size; | |
75 | } | |
76 | ||
62fe710f | 77 | /** |
7e9a8c2c | 78 | * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
04e14be6 SW |
79 | * @data: data to hash |
80 | * @size: size of the hash table | |
62fe710f | 81 | * |
04e14be6 | 82 | * Return: the hash index of the backbone gateway |
62fe710f | 83 | */ |
6b5e971a | 84 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 85 | { |
097930e8 | 86 | const struct batadv_bla_backbone_gw *gw; |
6b5e971a | 87 | u32 hash = 0; |
23721387 | 88 | |
097930e8 LL |
89 | gw = (struct batadv_bla_backbone_gw *)data; |
90 | hash = jhash(&gw->orig, sizeof(gw->orig), hash); | |
91 | hash = jhash(&gw->vid, sizeof(gw->vid), hash); | |
23721387 SW |
92 | |
93 | return hash % size; | |
94 | } | |
95 | ||
04e14be6 | 96 | /** |
7e9a8c2c | 97 | * batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
04e14be6 SW |
98 | * @node: list node of the first entry to compare |
99 | * @data2: pointer to the second backbone gateway | |
100 | * | |
4b426b10 | 101 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 102 | */ |
4b426b10 SE |
103 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
104 | const void *data2) | |
23721387 | 105 | { |
bae98774 | 106 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 107 | hash_entry); |
4f248cff SE |
108 | const struct batadv_bla_backbone_gw *gw1 = data1; |
109 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 110 | |
c76d1525 | 111 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 112 | return false; |
c76d1525 SW |
113 | |
114 | if (gw1->vid != gw2->vid) | |
4b426b10 | 115 | return false; |
c76d1525 | 116 | |
4b426b10 | 117 | return true; |
23721387 SW |
118 | } |
119 | ||
04e14be6 | 120 | /** |
7e9a8c2c | 121 | * batadv_compare_claim() - compare address and vid of two claims |
04e14be6 SW |
122 | * @node: list node of the first entry to compare |
123 | * @data2: pointer to the second claims | |
124 | * | |
4b426b10 | 125 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 126 | */ |
4b426b10 SE |
127 | static bool batadv_compare_claim(const struct hlist_node *node, |
128 | const void *data2) | |
23721387 | 129 | { |
712bbfe4 | 130 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 131 | hash_entry); |
4f248cff SE |
132 | const struct batadv_bla_claim *cl1 = data1; |
133 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
134 | |
135 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 136 | return false; |
c76d1525 SW |
137 | |
138 | if (cl1->vid != cl2->vid) | |
4b426b10 | 139 | return false; |
23721387 | 140 | |
4b426b10 | 141 | return true; |
23721387 SW |
142 | } |
143 | ||
04e14be6 | 144 | /** |
7e9a8c2c | 145 | * batadv_backbone_gw_release() - release backbone gw from lists and queue for |
06e56ded SE |
146 | * free after rcu grace period |
147 | * @ref: kref pointer of the backbone gw | |
148 | */ | |
149 | static void batadv_backbone_gw_release(struct kref *ref) | |
150 | { | |
151 | struct batadv_bla_backbone_gw *backbone_gw; | |
152 | ||
153 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
154 | refcount); | |
155 | ||
156 | kfree_rcu(backbone_gw, rcu); | |
157 | } | |
158 | ||
159 | /** | |
7e9a8c2c | 160 | * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
c8b86c12 | 161 | * release it |
04e14be6 SW |
162 | * @backbone_gw: backbone gateway to be free'd |
163 | */ | |
c8b86c12 | 164 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 165 | { |
6340dcbd SE |
166 | if (!backbone_gw) |
167 | return; | |
168 | ||
06e56ded | 169 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
170 | } |
171 | ||
04e14be6 | 172 | /** |
7e9a8c2c SE |
173 | * batadv_claim_release() - release claim from lists and queue for free after |
174 | * rcu grace period | |
04e14be6 SW |
175 | * @ref: kref pointer of the claim |
176 | */ | |
71b7e3d3 | 177 | static void batadv_claim_release(struct kref *ref) |
23721387 | 178 | { |
71b7e3d3 | 179 | struct batadv_bla_claim *claim; |
3db0decf | 180 | struct batadv_bla_backbone_gw *old_backbone_gw; |
71b7e3d3 SE |
181 | |
182 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
183 | ||
3db0decf SE |
184 | spin_lock_bh(&claim->backbone_lock); |
185 | old_backbone_gw = claim->backbone_gw; | |
186 | claim->backbone_gw = NULL; | |
187 | spin_unlock_bh(&claim->backbone_lock); | |
188 | ||
189 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
190 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
191 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
192 | ||
193 | batadv_backbone_gw_put(old_backbone_gw); | |
194 | ||
63b39927 | 195 | kfree_rcu(claim, rcu); |
23721387 SW |
196 | } |
197 | ||
04e14be6 | 198 | /** |
7e9a8c2c | 199 | * batadv_claim_put() - decrement the claim refcounter and possibly release it |
04e14be6 SW |
200 | * @claim: claim to be free'd |
201 | */ | |
321e3e08 | 202 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
23721387 | 203 | { |
6340dcbd SE |
204 | if (!claim) |
205 | return; | |
206 | ||
71b7e3d3 | 207 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
208 | } |
209 | ||
1b371d13 | 210 | /** |
7e9a8c2c | 211 | * batadv_claim_hash_find() - looks for a claim in the claim hash |
1b371d13 | 212 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
213 | * @data: search data (may be local/static data) |
214 | * | |
62fe710f | 215 | * Return: claim if found or NULL otherwise. |
23721387 | 216 | */ |
6fc77a54 SE |
217 | static struct batadv_bla_claim * |
218 | batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
219 | struct batadv_bla_claim *data) | |
23721387 | 220 | { |
807736f6 | 221 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 222 | struct hlist_head *head; |
712bbfe4 ML |
223 | struct batadv_bla_claim *claim; |
224 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
225 | int index; |
226 | ||
227 | if (!hash) | |
228 | return NULL; | |
229 | ||
3b300de3 | 230 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
231 | head = &hash->table[index]; |
232 | ||
233 | rcu_read_lock(); | |
b67bfe0d | 234 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 235 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
236 | continue; |
237 | ||
71b7e3d3 | 238 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
239 | continue; |
240 | ||
241 | claim_tmp = claim; | |
242 | break; | |
243 | } | |
244 | rcu_read_unlock(); | |
245 | ||
246 | return claim_tmp; | |
247 | } | |
248 | ||
2c53040f | 249 | /** |
7e9a8c2c | 250 | * batadv_backbone_hash_find() - looks for a backbone gateway in the hash |
2c53040f | 251 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
252 | * @addr: the address of the originator |
253 | * @vid: the VLAN ID | |
254 | * | |
04e14be6 | 255 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 256 | */ |
bae98774 | 257 | static struct batadv_bla_backbone_gw * |
47ce5f1e | 258 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, const u8 *addr, |
6b5e971a | 259 | unsigned short vid) |
23721387 | 260 | { |
807736f6 | 261 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 262 | struct hlist_head *head; |
bae98774 ML |
263 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
264 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
265 | int index; |
266 | ||
267 | if (!hash) | |
268 | return NULL; | |
269 | ||
8fdd0153 | 270 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
271 | search_entry.vid = vid; |
272 | ||
3b300de3 | 273 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
274 | head = &hash->table[index]; |
275 | ||
276 | rcu_read_lock(); | |
b67bfe0d | 277 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
278 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
279 | &search_entry)) | |
23721387 SW |
280 | continue; |
281 | ||
06e56ded | 282 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
283 | continue; |
284 | ||
285 | backbone_gw_tmp = backbone_gw; | |
286 | break; | |
287 | } | |
288 | rcu_read_unlock(); | |
289 | ||
290 | return backbone_gw_tmp; | |
291 | } | |
292 | ||
04e14be6 | 293 | /** |
7e9a8c2c | 294 | * batadv_bla_del_backbone_claims() - delete all claims for a backbone |
04e14be6 SW |
295 | * @backbone_gw: backbone gateway where the claims should be removed |
296 | */ | |
56303d34 | 297 | static void |
bae98774 | 298 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 299 | { |
5bf74e9c | 300 | struct batadv_hashtable *hash; |
b67bfe0d | 301 | struct hlist_node *node_tmp; |
23721387 | 302 | struct hlist_head *head; |
712bbfe4 | 303 | struct batadv_bla_claim *claim; |
23721387 SW |
304 | int i; |
305 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
306 | ||
807736f6 | 307 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
308 | if (!hash) |
309 | return; | |
310 | ||
311 | for (i = 0; i < hash->size; i++) { | |
312 | head = &hash->table[i]; | |
313 | list_lock = &hash->list_locks[i]; | |
314 | ||
315 | spin_lock_bh(list_lock); | |
b67bfe0d | 316 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 317 | head, hash_entry) { |
23721387 SW |
318 | if (claim->backbone_gw != backbone_gw) |
319 | continue; | |
320 | ||
321e3e08 | 321 | batadv_claim_put(claim); |
b67bfe0d | 322 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
323 | } |
324 | spin_unlock_bh(list_lock); | |
325 | } | |
326 | ||
3f68785e | 327 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 328 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 329 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 330 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
331 | } |
332 | ||
2c53040f | 333 | /** |
7e9a8c2c | 334 | * batadv_bla_send_claim() - sends a claim frame according to the provided info |
2c53040f | 335 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 336 | * @mac: the mac address to be announced within the claim |
23721387 SW |
337 | * @vid: the VLAN ID |
338 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 339 | */ |
47ce5f1e | 340 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, const u8 *mac, |
eb2deb6b | 341 | unsigned short vid, int claimtype) |
23721387 SW |
342 | { |
343 | struct sk_buff *skb; | |
344 | struct ethhdr *ethhdr; | |
56303d34 | 345 | struct batadv_hard_iface *primary_if; |
23721387 | 346 | struct net_device *soft_iface; |
6b5e971a | 347 | u8 *hw_src; |
96412690 | 348 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 349 | __be32 zeroip = 0; |
23721387 | 350 | |
e5d89254 | 351 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
352 | if (!primary_if) |
353 | return; | |
354 | ||
807736f6 | 355 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 356 | sizeof(local_claim_dest)); |
23721387 SW |
357 | local_claim_dest.type = claimtype; |
358 | ||
359 | soft_iface = primary_if->soft_iface; | |
360 | ||
361 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
362 | /* IP DST: 0.0.0.0 */ | |
363 | zeroip, | |
364 | primary_if->soft_iface, | |
365 | /* IP SRC: 0.0.0.0 */ | |
366 | zeroip, | |
367 | /* Ethernet DST: Broadcast */ | |
368 | NULL, | |
369 | /* Ethernet SRC/HW SRC: originator mac */ | |
370 | primary_if->net_dev->dev_addr, | |
99e966fc | 371 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 372 | * with XX = claim type |
38ef3d1d | 373 | * and YY:YY = group id |
23721387 | 374 | */ |
6b5e971a | 375 | (u8 *)&local_claim_dest); |
23721387 SW |
376 | |
377 | if (!skb) | |
378 | goto out; | |
379 | ||
380 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 381 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
382 | |
383 | /* now we pretend that the client would have sent this ... */ | |
384 | switch (claimtype) { | |
3eb8773e | 385 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
386 | /* normal claim frame |
387 | * set Ethernet SRC to the clients mac | |
388 | */ | |
8fdd0153 | 389 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 390 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 391 | "%s(): CLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 392 | batadv_print_vid(vid)); |
23721387 | 393 | break; |
3eb8773e | 394 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
395 | /* unclaim frame |
396 | * set HW SRC to the clients mac | |
397 | */ | |
8fdd0153 | 398 | ether_addr_copy(hw_src, mac); |
39c75a51 | 399 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 400 | "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 401 | batadv_print_vid(vid)); |
23721387 | 402 | break; |
acd34afa | 403 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 | 404 | /* announcement frame |
791ad7f5 | 405 | * set HW SRC to the special mac containing the crc |
23721387 | 406 | */ |
8fdd0153 | 407 | ether_addr_copy(hw_src, mac); |
39c75a51 | 408 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 409 | "%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
f7a2bd65 | 410 | ethhdr->h_source, batadv_print_vid(vid)); |
23721387 | 411 | break; |
acd34afa | 412 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 413 | /* request frame |
99e966fc SW |
414 | * set HW SRC and header destination to the receiving backbone |
415 | * gws mac | |
23721387 | 416 | */ |
8fdd0153 AQ |
417 | ether_addr_copy(hw_src, mac); |
418 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 419 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 420 | "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
5f80df67 | 421 | ethhdr->h_source, ethhdr->h_dest, |
f7a2bd65 | 422 | batadv_print_vid(vid)); |
23721387 | 423 | break; |
cd9c7bfb SW |
424 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
425 | ether_addr_copy(ethhdr->h_source, mac); | |
426 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
427 | "%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
428 | __func__, ethhdr->h_source, ethhdr->h_dest, | |
f7a2bd65 | 429 | batadv_print_vid(vid)); |
cd9c7bfb SW |
430 | |
431 | break; | |
23721387 SW |
432 | } |
433 | ||
10c78f58 | 434 | if (vid & BATADV_VLAN_HAS_TAG) { |
eb2deb6b AQ |
435 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
436 | vid & VLAN_VID_MASK); | |
10c78f58 SE |
437 | if (!skb) |
438 | goto out; | |
439 | } | |
23721387 SW |
440 | |
441 | skb_reset_mac_header(skb); | |
442 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
443 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
444 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
445 | skb->len + ETH_HLEN); | |
23721387 | 446 | |
94da81e2 | 447 | netif_rx(skb); |
23721387 | 448 | out: |
79a0bffb | 449 | batadv_hardif_put(primary_if); |
23721387 SW |
450 | } |
451 | ||
cd9c7bfb | 452 | /** |
7e9a8c2c | 453 | * batadv_bla_loopdetect_report() - worker for reporting the loop |
cd9c7bfb SW |
454 | * @work: work queue item |
455 | * | |
456 | * Throws an uevent, as the loopdetect check function can't do that itself | |
457 | * since the kernel may sleep while throwing uevents. | |
458 | */ | |
459 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
460 | { | |
461 | struct batadv_bla_backbone_gw *backbone_gw; | |
462 | struct batadv_priv *bat_priv; | |
463 | char vid_str[6] = { '\0' }; | |
464 | ||
465 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
466 | report_work); | |
467 | bat_priv = backbone_gw->bat_priv; | |
468 | ||
469 | batadv_info(bat_priv->soft_iface, | |
470 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
f7a2bd65 | 471 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb | 472 | snprintf(vid_str, sizeof(vid_str), "%d", |
f7a2bd65 | 473 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb SW |
474 | vid_str[sizeof(vid_str) - 1] = 0; |
475 | ||
476 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
477 | vid_str); | |
478 | ||
479 | batadv_backbone_gw_put(backbone_gw); | |
480 | } | |
481 | ||
2c53040f | 482 | /** |
7e9a8c2c | 483 | * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
2c53040f | 484 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
485 | * @orig: the mac address of the originator |
486 | * @vid: the VLAN ID | |
e3357189 | 487 | * @own_backbone: set if the requested backbone is local |
23721387 | 488 | * |
04e14be6 | 489 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 490 | */ |
bae98774 | 491 | static struct batadv_bla_backbone_gw * |
47ce5f1e | 492 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, const u8 *orig, |
eb2deb6b | 493 | unsigned short vid, bool own_backbone) |
23721387 | 494 | { |
bae98774 | 495 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 496 | struct batadv_orig_node *orig_node; |
23721387 SW |
497 | int hash_added; |
498 | ||
3b300de3 | 499 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
500 | |
501 | if (entry) | |
502 | return entry; | |
503 | ||
39c75a51 | 504 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 505 | "%s(): not found (%pM, %d), creating new entry\n", __func__, |
f7a2bd65 | 506 | orig, batadv_print_vid(vid)); |
23721387 SW |
507 | |
508 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
509 | if (!entry) | |
510 | return NULL; | |
511 | ||
512 | entry->vid = vid; | |
513 | entry->lasttime = jiffies; | |
3964f728 | 514 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 515 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 516 | spin_lock_init(&entry->crc_lock); |
23721387 | 517 | atomic_set(&entry->request_sent, 0); |
28709878 | 518 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 519 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 520 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
06e56ded | 521 | kref_init(&entry->refcount); |
23721387 | 522 | |
4e8389e1 | 523 | kref_get(&entry->refcount); |
807736f6 | 524 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
525 | batadv_compare_backbone_gw, |
526 | batadv_choose_backbone_gw, entry, | |
527 | &entry->hash_entry); | |
23721387 SW |
528 | |
529 | if (unlikely(hash_added != 0)) { | |
530 | /* hash failed, free the structure */ | |
531 | kfree(entry); | |
532 | return NULL; | |
533 | } | |
534 | ||
95fb130d | 535 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 536 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 537 | if (orig_node) { |
95fb130d | 538 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 539 | "became a backbone gateway"); |
5d967310 | 540 | batadv_orig_node_put(orig_node); |
20ff9d59 | 541 | } |
52aebd6a | 542 | |
d807f272 | 543 | if (own_backbone) { |
52aebd6a SW |
544 | batadv_bla_send_announce(bat_priv, entry); |
545 | ||
d807f272 SW |
546 | /* this will be decreased in the worker thread */ |
547 | atomic_inc(&entry->request_sent); | |
28709878 | 548 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
549 | atomic_inc(&bat_priv->bla.num_requests); |
550 | } | |
551 | ||
23721387 SW |
552 | return entry; |
553 | } | |
554 | ||
04e14be6 | 555 | /** |
7e9a8c2c | 556 | * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN |
04e14be6 SW |
557 | * @bat_priv: the bat priv with all the soft interface information |
558 | * @primary_if: the selected primary interface | |
559 | * @vid: VLAN identifier | |
560 | * | |
561 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
562 | * where we receive other backbone gws |
563 | */ | |
56303d34 SE |
564 | static void |
565 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
566 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 567 | unsigned short vid) |
23721387 | 568 | { |
bae98774 | 569 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 570 | |
3b300de3 SE |
571 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
572 | primary_if->net_dev->dev_addr, | |
52aebd6a | 573 | vid, true); |
23721387 SW |
574 | if (unlikely(!backbone_gw)) |
575 | return; | |
576 | ||
577 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 578 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
579 | } |
580 | ||
1b371d13 | 581 | /** |
7e9a8c2c | 582 | * batadv_bla_answer_request() - answer a bla request by sending own claims |
1b371d13 | 583 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 584 | * @primary_if: interface where the request came on |
23721387 SW |
585 | * @vid: the vid where the request came on |
586 | * | |
587 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
588 | * to allow the requester another check if the CRC is correct now. | |
589 | */ | |
56303d34 SE |
590 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
591 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 592 | unsigned short vid) |
23721387 | 593 | { |
23721387 | 594 | struct hlist_head *head; |
5bf74e9c | 595 | struct batadv_hashtable *hash; |
712bbfe4 | 596 | struct batadv_bla_claim *claim; |
bae98774 | 597 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
598 | int i; |
599 | ||
39c75a51 | 600 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
601 | "%s(): received a claim request, send all of our own claims again\n", |
602 | __func__); | |
23721387 | 603 | |
3b300de3 SE |
604 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
605 | primary_if->net_dev->dev_addr, | |
606 | vid); | |
23721387 SW |
607 | if (!backbone_gw) |
608 | return; | |
609 | ||
807736f6 | 610 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
611 | for (i = 0; i < hash->size; i++) { |
612 | head = &hash->table[i]; | |
613 | ||
614 | rcu_read_lock(); | |
b67bfe0d | 615 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
616 | /* only own claims are interesting */ |
617 | if (claim->backbone_gw != backbone_gw) | |
618 | continue; | |
619 | ||
3b300de3 | 620 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 621 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
622 | } |
623 | rcu_read_unlock(); | |
624 | } | |
625 | ||
626 | /* finally, send an announcement frame */ | |
3b300de3 | 627 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 628 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
629 | } |
630 | ||
1b371d13 | 631 | /** |
7e9a8c2c | 632 | * batadv_bla_send_request() - send a request to repeat claims |
1b371d13 | 633 | * @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
634 | * |
635 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
636 | * After the request, it will repeat all of his own claims and finally | |
637 | * send an announcement claim with which we can check again. | |
638 | */ | |
bae98774 | 639 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
640 | { |
641 | /* first, remove all old entries */ | |
3b300de3 | 642 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 643 | |
39c75a51 SE |
644 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
645 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
646 | |
647 | /* send request */ | |
3b300de3 | 648 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 649 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
650 | |
651 | /* no local broadcasts should be sent or received, for now. */ | |
652 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 653 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
654 | atomic_set(&backbone_gw->request_sent, 1); |
655 | } | |
656 | } | |
657 | ||
1b371d13 | 658 | /** |
7e9a8c2c | 659 | * batadv_bla_send_announce() - Send an announcement frame |
1b371d13 | 660 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 661 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 662 | */ |
56303d34 | 663 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 664 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 665 | { |
6b5e971a | 666 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 667 | __be16 crc; |
23721387 | 668 | |
3b300de3 | 669 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 670 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 671 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 672 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 673 | memcpy(&mac[4], &crc, 2); |
23721387 | 674 | |
3b300de3 | 675 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 676 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
677 | } |
678 | ||
2c53040f | 679 | /** |
7e9a8c2c | 680 | * batadv_bla_add_claim() - Adds a claim in the claim hash |
2c53040f | 681 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
682 | * @mac: the mac address of the claim |
683 | * @vid: the VLAN ID of the frame | |
684 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 685 | */ |
56303d34 | 686 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 687 | const u8 *mac, const unsigned short vid, |
bae98774 | 688 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 689 | { |
3db0decf | 690 | struct batadv_bla_backbone_gw *old_backbone_gw; |
712bbfe4 ML |
691 | struct batadv_bla_claim *claim; |
692 | struct batadv_bla_claim search_claim; | |
3db0decf | 693 | bool remove_crc = false; |
23721387 SW |
694 | int hash_added; |
695 | ||
8fdd0153 | 696 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 697 | search_claim.vid = vid; |
3b300de3 | 698 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
699 | |
700 | /* create a new claim entry if it does not exist yet. */ | |
701 | if (!claim) { | |
702 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
703 | if (!claim) | |
704 | return; | |
705 | ||
8fdd0153 | 706 | ether_addr_copy(claim->addr, mac); |
3db0decf | 707 | spin_lock_init(&claim->backbone_lock); |
23721387 SW |
708 | claim->vid = vid; |
709 | claim->lasttime = jiffies; | |
3db0decf | 710 | kref_get(&backbone_gw->refcount); |
23721387 | 711 | claim->backbone_gw = backbone_gw; |
71b7e3d3 | 712 | kref_init(&claim->refcount); |
7282ac39 | 713 | |
39c75a51 | 714 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
715 | "%s(): adding new entry %pM, vid %d to hash ...\n", |
716 | __func__, mac, batadv_print_vid(vid)); | |
7282ac39 SE |
717 | |
718 | kref_get(&claim->refcount); | |
807736f6 | 719 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
720 | batadv_compare_claim, |
721 | batadv_choose_claim, claim, | |
722 | &claim->hash_entry); | |
23721387 SW |
723 | |
724 | if (unlikely(hash_added != 0)) { | |
725 | /* only local changes happened. */ | |
726 | kfree(claim); | |
727 | return; | |
728 | } | |
729 | } else { | |
730 | claim->lasttime = jiffies; | |
731 | if (claim->backbone_gw == backbone_gw) | |
732 | /* no need to register a new backbone */ | |
733 | goto claim_free_ref; | |
734 | ||
39c75a51 | 735 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
736 | "%s(): changing ownership for %pM, vid %d to gw %pM\n", |
737 | __func__, mac, batadv_print_vid(vid), | |
738 | backbone_gw->orig); | |
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 | 769 | /** |
7e9a8c2c | 770 | * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of |
3db0decf SE |
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 | 789 | /** |
7e9a8c2c | 790 | * batadv_bla_del_claim() - delete a claim from the claim hash |
04e14be6 SW |
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; |
4ba104f4 SE |
799 | struct batadv_bla_claim *claim_removed_entry; |
800 | struct hlist_node *claim_removed_node; | |
23721387 | 801 | |
8fdd0153 | 802 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 803 | search_claim.vid = vid; |
3b300de3 | 804 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
805 | if (!claim) |
806 | return; | |
807 | ||
22f0502e | 808 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, |
f7a2bd65 | 809 | mac, batadv_print_vid(vid)); |
23721387 | 810 | |
4ba104f4 SE |
811 | claim_removed_node = batadv_hash_remove(bat_priv->bla.claim_hash, |
812 | batadv_compare_claim, | |
813 | batadv_choose_claim, claim); | |
814 | if (!claim_removed_node) | |
815 | goto free_claim; | |
23721387 | 816 | |
4ba104f4 SE |
817 | /* reference from the hash is gone */ |
818 | claim_removed_entry = hlist_entry(claim_removed_node, | |
819 | struct batadv_bla_claim, hash_entry); | |
820 | batadv_claim_put(claim_removed_entry); | |
821 | ||
822 | free_claim: | |
23721387 | 823 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 824 | batadv_claim_put(claim); |
23721387 SW |
825 | } |
826 | ||
62fe710f | 827 | /** |
7e9a8c2c | 828 | * batadv_handle_announce() - check for ANNOUNCE frame |
04e14be6 SW |
829 | * @bat_priv: the bat priv with all the soft interface information |
830 | * @an_addr: announcement mac address (ARP Sender HW address) | |
831 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
832 | * @vid: the VLAN ID of the frame | |
62fe710f | 833 | * |
4b426b10 | 834 | * Return: true if handled |
62fe710f | 835 | */ |
4b426b10 SE |
836 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
837 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 838 | { |
bae98774 | 839 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 840 | u16 backbone_crc, crc; |
23721387 | 841 | |
3b300de3 | 842 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 843 | return false; |
23721387 | 844 | |
52aebd6a SW |
845 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
846 | false); | |
23721387 SW |
847 | |
848 | if (unlikely(!backbone_gw)) | |
4b426b10 | 849 | return true; |
23721387 | 850 | |
23721387 SW |
851 | /* handle as ANNOUNCE frame */ |
852 | backbone_gw->lasttime = jiffies; | |
61a29286 | 853 | crc = ntohs(*((__force __be16 *)(&an_addr[4]))); |
23721387 | 854 | |
39c75a51 | 855 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
856 | "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
857 | __func__, batadv_print_vid(vid), backbone_gw->orig, crc); | |
23721387 | 858 | |
5a1dd8a4 SW |
859 | spin_lock_bh(&backbone_gw->crc_lock); |
860 | backbone_crc = backbone_gw->crc; | |
861 | spin_unlock_bh(&backbone_gw->crc_lock); | |
862 | ||
863 | if (backbone_crc != crc) { | |
39c75a51 | 864 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
865 | "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
866 | __func__, backbone_gw->orig, | |
f7a2bd65 | 867 | batadv_print_vid(backbone_gw->vid), |
5a1dd8a4 | 868 | backbone_crc, crc); |
23721387 | 869 | |
3b300de3 | 870 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
871 | } else { |
872 | /* if we have sent a request and the crc was OK, | |
873 | * we can allow traffic again. | |
874 | */ | |
875 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 876 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
877 | atomic_set(&backbone_gw->request_sent, 0); |
878 | } | |
879 | } | |
880 | ||
c8b86c12 | 881 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 882 | return true; |
23721387 SW |
883 | } |
884 | ||
62fe710f | 885 | /** |
7e9a8c2c | 886 | * batadv_handle_request() - check for REQUEST frame |
04e14be6 SW |
887 | * @bat_priv: the bat priv with all the soft interface information |
888 | * @primary_if: the primary hard interface of this batman soft interface | |
889 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
890 | * @ethhdr: ethernet header of a packet | |
891 | * @vid: the VLAN ID of the frame | |
62fe710f | 892 | * |
4b426b10 | 893 | * Return: true if handled |
62fe710f | 894 | */ |
4b426b10 SE |
895 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
896 | struct batadv_hard_iface *primary_if, | |
897 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
898 | unsigned short vid) | |
23721387 SW |
899 | { |
900 | /* check for REQUEST frame */ | |
1eda58bf | 901 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 902 | return false; |
23721387 SW |
903 | |
904 | /* sanity check, this should not happen on a normal switch, | |
905 | * we ignore it in this case. | |
906 | */ | |
1eda58bf | 907 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 908 | return true; |
23721387 | 909 | |
39c75a51 | 910 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
911 | "%s(): REQUEST vid %d (sent by %pM)...\n", |
912 | __func__, batadv_print_vid(vid), ethhdr->h_source); | |
23721387 | 913 | |
3b300de3 | 914 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 915 | return true; |
23721387 SW |
916 | } |
917 | ||
62fe710f | 918 | /** |
7e9a8c2c | 919 | * batadv_handle_unclaim() - check for UNCLAIM frame |
04e14be6 SW |
920 | * @bat_priv: the bat priv with all the soft interface information |
921 | * @primary_if: the primary hard interface of this batman soft interface | |
922 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
923 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
924 | * @vid: the VLAN ID of the frame | |
62fe710f | 925 | * |
4b426b10 | 926 | * Return: true if handled |
62fe710f | 927 | */ |
4b426b10 SE |
928 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
929 | struct batadv_hard_iface *primary_if, | |
47ce5f1e | 930 | const u8 *backbone_addr, const u8 *claim_addr, |
4b426b10 | 931 | unsigned short vid) |
23721387 | 932 | { |
bae98774 | 933 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
934 | |
935 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
936 | if (primary_if && batadv_compare_eth(backbone_addr, |
937 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 938 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 939 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 940 | |
3b300de3 | 941 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
942 | |
943 | if (!backbone_gw) | |
4b426b10 | 944 | return true; |
23721387 SW |
945 | |
946 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 947 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 948 | "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, |
f7a2bd65 | 949 | claim_addr, batadv_print_vid(vid), backbone_gw->orig); |
23721387 | 950 | |
3b300de3 | 951 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 952 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 953 | return true; |
23721387 SW |
954 | } |
955 | ||
62fe710f | 956 | /** |
7e9a8c2c | 957 | * batadv_handle_claim() - check for CLAIM frame |
04e14be6 SW |
958 | * @bat_priv: the bat priv with all the soft interface information |
959 | * @primary_if: the primary hard interface of this batman soft interface | |
960 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
961 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
962 | * @vid: the VLAN ID of the frame | |
62fe710f | 963 | * |
4b426b10 | 964 | * Return: true if handled |
62fe710f | 965 | */ |
4b426b10 SE |
966 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
967 | struct batadv_hard_iface *primary_if, | |
47ce5f1e | 968 | const u8 *backbone_addr, const u8 *claim_addr, |
4b426b10 | 969 | unsigned short vid) |
23721387 | 970 | { |
bae98774 | 971 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
972 | |
973 | /* register the gateway if not yet available, and add the claim. */ | |
974 | ||
52aebd6a SW |
975 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
976 | false); | |
23721387 SW |
977 | |
978 | if (unlikely(!backbone_gw)) | |
4b426b10 | 979 | return true; |
23721387 SW |
980 | |
981 | /* this must be a CLAIM frame */ | |
3b300de3 | 982 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 983 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 984 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 985 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
986 | |
987 | /* TODO: we could call something like tt_local_del() here. */ | |
988 | ||
c8b86c12 | 989 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 990 | return true; |
23721387 SW |
991 | } |
992 | ||
2c53040f | 993 | /** |
7e9a8c2c | 994 | * batadv_check_claim_group() - check for claim group membership |
2c53040f | 995 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 996 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
997 | * @hw_src: the Hardware source in the ARP Header |
998 | * @hw_dst: the Hardware destination in the ARP Header | |
999 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
1000 | * | |
bccb48c8 | 1001 | * checks if it is a claim packet and if it's on the same group. |
38ef3d1d SW |
1002 | * This function also applies the group ID of the sender |
1003 | * if it is in the same mesh. | |
1004 | * | |
62fe710f | 1005 | * Return: |
38ef3d1d SW |
1006 | * 2 - if it is a claim packet and on the same group |
1007 | * 1 - if is a claim packet from another group | |
1008 | * 0 - if it is not a claim packet | |
1009 | */ | |
56303d34 SE |
1010 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1011 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1012 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1013 | struct ethhdr *ethhdr) |
38ef3d1d | 1014 | { |
6b5e971a | 1015 | u8 *backbone_addr; |
56303d34 | 1016 | struct batadv_orig_node *orig_node; |
96412690 | 1017 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1018 | |
96412690 | 1019 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1020 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1021 | |
38ef3d1d SW |
1022 | /* if announcement packet, use the source, |
1023 | * otherwise assume it is in the hw_src | |
1024 | */ | |
1025 | switch (bla_dst->type) { | |
3eb8773e | 1026 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1027 | backbone_addr = hw_src; |
1028 | break; | |
acd34afa SE |
1029 | case BATADV_CLAIM_TYPE_REQUEST: |
1030 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1031 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1032 | backbone_addr = ethhdr->h_source; |
1033 | break; | |
1034 | default: | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1039 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1040 | return 0; |
1041 | ||
1042 | /* if its already the same group, it is fine. */ | |
1043 | if (bla_dst->group == bla_dst_own->group) | |
1044 | return 2; | |
1045 | ||
1046 | /* lets see if this originator is in our mesh */ | |
da641193 | 1047 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d | 1048 | |
791ad7f5 | 1049 | /* don't accept claims from gateways which are not in |
38ef3d1d SW |
1050 | * the same mesh or group. |
1051 | */ | |
1052 | if (!orig_node) | |
1053 | return 1; | |
1054 | ||
1055 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1056 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1057 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1058 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1059 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1060 | bla_dst_own->group = bla_dst->group; |
1061 | } | |
1062 | ||
5d967310 | 1063 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1064 | |
1065 | return 2; | |
1066 | } | |
1067 | ||
1b371d13 | 1068 | /** |
7e9a8c2c | 1069 | * batadv_bla_process_claim() - Check if this is a claim frame, and process it |
1b371d13 | 1070 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1071 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1072 | * @skb: the frame to be checked |
1073 | * | |
4b426b10 | 1074 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1075 | * tell the callee that it can use the frame on its own. |
1076 | */ | |
4b426b10 SE |
1077 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1078 | struct batadv_hard_iface *primary_if, | |
1079 | struct sk_buff *skb) | |
23721387 | 1080 | { |
d46b6bfa | 1081 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1082 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1083 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1084 | struct ethhdr *ethhdr; |
23721387 | 1085 | struct arphdr *arphdr; |
c018ad3d | 1086 | unsigned short vid; |
d46b6bfa | 1087 | int vlan_depth = 0; |
293e9338 | 1088 | __be16 proto; |
23721387 | 1089 | int headlen; |
38ef3d1d | 1090 | int ret; |
23721387 | 1091 | |
c018ad3d | 1092 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1093 | ethhdr = eth_hdr(skb); |
23721387 | 1094 | |
c018ad3d AQ |
1095 | proto = ethhdr->h_proto; |
1096 | headlen = ETH_HLEN; | |
1097 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1098 | /* Traverse the VLAN/Ethertypes. |
1099 | * | |
1100 | * At this point it is known that the first protocol is a VLAN | |
1101 | * header, so start checking at the encapsulated protocol. | |
1102 | * | |
1103 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1104 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1105 | */ | |
1106 | do { | |
1107 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1108 | &vhdr_buf); | |
1109 | if (!vhdr) | |
4b426b10 | 1110 | return false; |
d46b6bfa SW |
1111 | |
1112 | proto = vhdr->h_vlan_encapsulated_proto; | |
1113 | headlen += VLAN_HLEN; | |
1114 | vlan_depth++; | |
1115 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1116 | } |
1117 | ||
293e9338 | 1118 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1119 | return false; /* not a claim frame */ |
23721387 SW |
1120 | |
1121 | /* this must be a ARP frame. check if it is a claim. */ | |
1122 | ||
1123 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1124 | return false; |
23721387 SW |
1125 | |
1126 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1127 | ethhdr = eth_hdr(skb); |
6b5e971a | 1128 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1129 | |
1130 | /* Check whether the ARP frame carries a valid | |
1131 | * IP information | |
1132 | */ | |
23721387 | 1133 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1134 | return false; |
23721387 | 1135 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1136 | return false; |
23721387 | 1137 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1138 | return false; |
23721387 | 1139 | if (arphdr->ar_pln != 4) |
4b426b10 | 1140 | return false; |
23721387 | 1141 | |
6b5e971a | 1142 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1143 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1144 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1145 | bla_dst_own = &bat_priv->bla.claim_dest; |
1146 | ||
1147 | /* check if it is a claim frame in general */ | |
1148 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1149 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1150 | return false; |
d46b6bfa SW |
1151 | |
1152 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1153 | * drop that, as this is not supported by BLA but should also not be | |
1154 | * sent via the mesh. | |
1155 | */ | |
1156 | if (vlan_depth > 1) | |
4b426b10 | 1157 | return true; |
23721387 | 1158 | |
cd9c7bfb SW |
1159 | /* Let the loopdetect frames on the mesh in any case. */ |
1160 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1161 | return false; |
cd9c7bfb | 1162 | |
23721387 | 1163 | /* check if it is a claim frame. */ |
3b300de3 SE |
1164 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1165 | ethhdr); | |
38ef3d1d | 1166 | if (ret == 1) |
39c75a51 | 1167 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1168 | "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1169 | __func__, ethhdr->h_source, batadv_print_vid(vid), | |
1170 | hw_src, hw_dst); | |
38ef3d1d SW |
1171 | |
1172 | if (ret < 2) | |
4b426b10 | 1173 | return !!ret; |
23721387 SW |
1174 | |
1175 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1176 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1177 | |
1178 | /* check for the different types of claim frames ... */ | |
1179 | switch (bla_dst->type) { | |
3eb8773e | 1180 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1181 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1182 | ethhdr->h_source, vid)) | |
4b426b10 | 1183 | return true; |
23721387 | 1184 | break; |
3eb8773e | 1185 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1186 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1187 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1188 | return true; |
23721387 SW |
1189 | break; |
1190 | ||
acd34afa | 1191 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1192 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1193 | vid)) | |
4b426b10 | 1194 | return true; |
23721387 | 1195 | break; |
acd34afa | 1196 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1197 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1198 | vid)) | |
4b426b10 | 1199 | return true; |
23721387 SW |
1200 | break; |
1201 | } | |
1202 | ||
39c75a51 | 1203 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1204 | "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1205 | __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, | |
1206 | hw_dst); | |
4b426b10 | 1207 | return true; |
23721387 SW |
1208 | } |
1209 | ||
04e14be6 | 1210 | /** |
7e9a8c2c | 1211 | * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or |
04e14be6 SW |
1212 | * immediately |
1213 | * @bat_priv: the bat priv with all the soft interface information | |
1214 | * @now: whether the whole hash shall be wiped now | |
1215 | * | |
1216 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1217 | * a time out, or clean all backbone gws if now is set. |
1218 | */ | |
56303d34 | 1219 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1220 | { |
bae98774 | 1221 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1222 | struct hlist_node *node_tmp; |
23721387 | 1223 | struct hlist_head *head; |
5bf74e9c | 1224 | struct batadv_hashtable *hash; |
23721387 SW |
1225 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1226 | int i; | |
1227 | ||
807736f6 | 1228 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1229 | if (!hash) |
1230 | return; | |
1231 | ||
1232 | for (i = 0; i < hash->size; i++) { | |
1233 | head = &hash->table[i]; | |
1234 | list_lock = &hash->list_locks[i]; | |
1235 | ||
1236 | spin_lock_bh(list_lock); | |
b67bfe0d | 1237 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1238 | head, hash_entry) { |
1239 | if (now) | |
1240 | goto purge_now; | |
1eda58bf | 1241 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1242 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1243 | continue; |
1244 | ||
39c75a51 | 1245 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
1246 | "%s(): backbone gw %pM timed out\n", |
1247 | __func__, backbone_gw->orig); | |
23721387 SW |
1248 | |
1249 | purge_now: | |
1250 | /* don't wait for the pending request anymore */ | |
1251 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1252 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1253 | |
3b300de3 | 1254 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1255 | |
b67bfe0d | 1256 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1257 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1258 | } |
1259 | spin_unlock_bh(list_lock); | |
1260 | } | |
1261 | } | |
1262 | ||
2c53040f | 1263 | /** |
7e9a8c2c | 1264 | * batadv_bla_purge_claims() - Remove claims after a timeout or immediately |
2c53040f | 1265 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1266 | * @primary_if: the selected primary interface, may be NULL if now is set |
1267 | * @now: whether the whole hash shall be wiped now | |
1268 | * | |
1269 | * Check when we heard last time from our own claims, and remove them in case of | |
1270 | * a time out, or clean all claims if now is set | |
1271 | */ | |
56303d34 SE |
1272 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1273 | struct batadv_hard_iface *primary_if, | |
1274 | int now) | |
23721387 | 1275 | { |
3db0decf | 1276 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1277 | struct batadv_bla_claim *claim; |
23721387 | 1278 | struct hlist_head *head; |
5bf74e9c | 1279 | struct batadv_hashtable *hash; |
23721387 SW |
1280 | int i; |
1281 | ||
807736f6 | 1282 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1283 | if (!hash) |
1284 | return; | |
1285 | ||
1286 | for (i = 0; i < hash->size; i++) { | |
1287 | head = &hash->table[i]; | |
1288 | ||
1289 | rcu_read_lock(); | |
b67bfe0d | 1290 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1291 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1292 | if (now) |
1293 | goto purge_now; | |
3db0decf SE |
1294 | |
1295 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1296 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1297 | goto skip; |
1298 | ||
1eda58bf | 1299 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1300 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1301 | goto skip; |
23721387 | 1302 | |
39c75a51 | 1303 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1304 | "%s(): timed out.\n", __func__); |
23721387 SW |
1305 | |
1306 | purge_now: | |
4dd72f73 | 1307 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1308 | "%s(): %pM, vid %d\n", __func__, |
4dd72f73 AP |
1309 | claim->addr, claim->vid); |
1310 | ||
3b300de3 | 1311 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1312 | backbone_gw->orig, |
3b300de3 | 1313 | claim->addr, claim->vid); |
3db0decf SE |
1314 | skip: |
1315 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1316 | } |
1317 | rcu_read_unlock(); | |
1318 | } | |
1319 | } | |
1320 | ||
2c53040f | 1321 | /** |
7e9a8c2c | 1322 | * batadv_bla_update_orig_address() - Update the backbone gateways when the own |
04e14be6 | 1323 | * originator address changes |
2c53040f | 1324 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1325 | * @primary_if: the new selected primary_if |
1326 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1327 | */ |
56303d34 SE |
1328 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1329 | struct batadv_hard_iface *primary_if, | |
1330 | struct batadv_hard_iface *oldif) | |
23721387 | 1331 | { |
bae98774 | 1332 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1333 | struct hlist_head *head; |
5bf74e9c | 1334 | struct batadv_hashtable *hash; |
807736f6 | 1335 | __be16 group; |
23721387 SW |
1336 | int i; |
1337 | ||
38ef3d1d | 1338 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1339 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1340 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1341 | |
d5b4c93e SW |
1342 | /* purge everything when bridge loop avoidance is turned off */ |
1343 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1344 | oldif = NULL; | |
1345 | ||
23721387 | 1346 | if (!oldif) { |
3b300de3 SE |
1347 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1348 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1349 | return; |
1350 | } | |
1351 | ||
807736f6 | 1352 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1353 | if (!hash) |
1354 | return; | |
1355 | ||
1356 | for (i = 0; i < hash->size; i++) { | |
1357 | head = &hash->table[i]; | |
1358 | ||
1359 | rcu_read_lock(); | |
b67bfe0d | 1360 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1361 | /* own orig still holds the old value. */ |
1eda58bf SE |
1362 | if (!batadv_compare_eth(backbone_gw->orig, |
1363 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1364 | continue; |
1365 | ||
8fdd0153 AQ |
1366 | ether_addr_copy(backbone_gw->orig, |
1367 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1368 | /* send an announce frame so others will ask for our |
1369 | * claims and update their tables. | |
1370 | */ | |
3b300de3 | 1371 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1372 | } |
1373 | rcu_read_unlock(); | |
1374 | } | |
1375 | } | |
1376 | ||
cd9c7bfb | 1377 | /** |
7e9a8c2c | 1378 | * batadv_bla_send_loopdetect() - send a loopdetect frame |
cd9c7bfb SW |
1379 | * @bat_priv: the bat priv with all the soft interface information |
1380 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1381 | * | |
1382 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1383 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1384 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1385 | * indicates that there is a loop. | |
1386 | */ | |
1387 | static void | |
1388 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1389 | struct batadv_bla_backbone_gw *backbone_gw) | |
1390 | { | |
1391 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1392 | backbone_gw->vid); | |
1393 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1394 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1395 | } | |
1396 | ||
d68081a2 | 1397 | /** |
7e9a8c2c | 1398 | * batadv_bla_status_update() - purge bla interfaces if necessary |
d68081a2 SW |
1399 | * @net_dev: the soft interface net device |
1400 | */ | |
1401 | void batadv_bla_status_update(struct net_device *net_dev) | |
1402 | { | |
1403 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1404 | struct batadv_hard_iface *primary_if; | |
1405 | ||
1406 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1407 | if (!primary_if) | |
1408 | return; | |
1409 | ||
1410 | /* this function already purges everything when bla is disabled, | |
1411 | * so just call that one. | |
1412 | */ | |
1413 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1414 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1415 | } |
1416 | ||
04e14be6 | 1417 | /** |
7e9a8c2c | 1418 | * batadv_bla_periodic_work() - performs periodic bla work |
04e14be6 SW |
1419 | * @work: kernel work struct |
1420 | * | |
1421 | * periodic work to do: | |
23721387 SW |
1422 | * * purge structures when they are too old |
1423 | * * send announcements | |
1424 | */ | |
3b300de3 | 1425 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1426 | { |
bbb1f90e | 1427 | struct delayed_work *delayed_work; |
56303d34 | 1428 | struct batadv_priv *bat_priv; |
807736f6 | 1429 | struct batadv_priv_bla *priv_bla; |
23721387 | 1430 | struct hlist_head *head; |
bae98774 | 1431 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1432 | struct batadv_hashtable *hash; |
56303d34 | 1433 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1434 | bool send_loopdetect = false; |
23721387 SW |
1435 | int i; |
1436 | ||
4ba4bc0f | 1437 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1438 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1439 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1440 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1441 | if (!primary_if) |
1442 | goto out; | |
1443 | ||
3b300de3 SE |
1444 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1445 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1446 | |
1447 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1448 | goto out; | |
1449 | ||
cd9c7bfb SW |
1450 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1451 | /* set a new random mac address for the next bridge loop | |
1452 | * detection frames. Set the locally administered bit to avoid | |
1453 | * collisions with users mac addresses. | |
1454 | */ | |
6c1f0a1f | 1455 | eth_random_addr(bat_priv->bla.loopdetect_addr); |
cd9c7bfb SW |
1456 | bat_priv->bla.loopdetect_addr[0] = 0xba; |
1457 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1458 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1459 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1460 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1461 | ||
1462 | /* mark for sending loop detect on all VLANs */ | |
1463 | send_loopdetect = true; | |
1464 | } | |
1465 | ||
807736f6 | 1466 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1467 | if (!hash) |
1468 | goto out; | |
1469 | ||
1470 | for (i = 0; i < hash->size; i++) { | |
1471 | head = &hash->table[i]; | |
1472 | ||
1473 | rcu_read_lock(); | |
b67bfe0d | 1474 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1475 | if (!batadv_compare_eth(backbone_gw->orig, |
1476 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1477 | continue; |
1478 | ||
1479 | backbone_gw->lasttime = jiffies; | |
1480 | ||
3b300de3 | 1481 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1482 | if (send_loopdetect) |
1483 | batadv_bla_send_loopdetect(bat_priv, | |
1484 | backbone_gw); | |
d807f272 SW |
1485 | |
1486 | /* request_sent is only set after creation to avoid | |
1487 | * problems when we are not yet known as backbone gw | |
1488 | * in the backbone. | |
1489 | * | |
28709878 SW |
1490 | * We can reset this now after we waited some periods |
1491 | * to give bridge forward delays and bla group forming | |
1492 | * some grace time. | |
d807f272 SW |
1493 | */ |
1494 | ||
1495 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1496 | continue; | |
1497 | ||
28709878 SW |
1498 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1499 | continue; | |
1500 | ||
d807f272 SW |
1501 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1502 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1503 | } |
1504 | rcu_read_unlock(); | |
1505 | } | |
1506 | out: | |
79a0bffb | 1507 | batadv_hardif_put(primary_if); |
23721387 | 1508 | |
72414442 AQ |
1509 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1510 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1511 | } |
1512 | ||
5d52dad2 SE |
1513 | /* The hash for claim and backbone hash receive the same key because they |
1514 | * are getting initialized by hash_new with the same key. Reinitializing | |
1515 | * them with to different keys to allow nested locking without generating | |
1516 | * lockdep warnings | |
1517 | */ | |
3b300de3 SE |
1518 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1519 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1520 | |
04e14be6 | 1521 | /** |
7e9a8c2c | 1522 | * batadv_bla_init() - initialize all bla structures |
04e14be6 SW |
1523 | * @bat_priv: the bat priv with all the soft interface information |
1524 | * | |
1525 | * Return: 0 on success, < 0 on error. | |
1526 | */ | |
56303d34 | 1527 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1528 | { |
fe2da6ff | 1529 | int i; |
6b5e971a | 1530 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1531 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1532 | u16 crc; |
807736f6 | 1533 | unsigned long entrytime; |
fe2da6ff | 1534 | |
7dac7b76 LL |
1535 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1536 | ||
39c75a51 | 1537 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1538 | |
38ef3d1d | 1539 | /* setting claim destination address */ |
807736f6 SE |
1540 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1541 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1542 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1543 | if (primary_if) { |
807736f6 SE |
1544 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1545 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1546 | batadv_hardif_put(primary_if); |
38ef3d1d | 1547 | } else { |
807736f6 | 1548 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1549 | } |
1550 | ||
fe2da6ff | 1551 | /* initialize the duplicate list */ |
807736f6 | 1552 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1553 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1554 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1555 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1556 | |
cd9c7bfb SW |
1557 | atomic_set(&bat_priv->bla.loopdetect_next, |
1558 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1559 | ||
807736f6 | 1560 | if (bat_priv->bla.claim_hash) |
5346c35e | 1561 | return 0; |
23721387 | 1562 | |
807736f6 | 1563 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
6f68cd63 PS |
1564 | if (!bat_priv->bla.claim_hash) |
1565 | return -ENOMEM; | |
23721387 | 1566 | |
6f68cd63 PS |
1567 | bat_priv->bla.backbone_hash = batadv_hash_new(32); |
1568 | if (!bat_priv->bla.backbone_hash) { | |
1569 | batadv_hash_destroy(bat_priv->bla.claim_hash); | |
5346c35e | 1570 | return -ENOMEM; |
6f68cd63 | 1571 | } |
23721387 | 1572 | |
807736f6 | 1573 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1574 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1575 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1576 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1577 | |
39c75a51 | 1578 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1579 | |
72414442 AQ |
1580 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1581 | ||
1582 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1583 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1584 | return 0; |
23721387 SW |
1585 | } |
1586 | ||
2c53040f | 1587 | /** |
2369e827 | 1588 | * batadv_bla_check_duplist() - Check if a frame is in the broadcast dup. |
2c53040f | 1589 | * @bat_priv: the bat priv with all the soft interface information |
2369e827 LL |
1590 | * @skb: contains the multicast packet to be checked |
1591 | * @payload_ptr: pointer to position inside the head buffer of the skb | |
1592 | * marking the start of the data to be CRC'ed | |
1593 | * @orig: originator mac address, NULL if unknown | |
fe2da6ff | 1594 | * |
2369e827 LL |
1595 | * Check if it is on our broadcast list. Another gateway might have sent the |
1596 | * same packet because it is connected to the same backbone, so we have to | |
1597 | * remove this duplicate. | |
fe2da6ff SW |
1598 | * |
1599 | * This is performed by checking the CRC, which will tell us | |
1600 | * with a good chance that it is the same packet. If it is furthermore | |
1601 | * sent by another host, drop it. We allow equal packets from | |
1602 | * the same host however as this might be intended. | |
04e14be6 | 1603 | * |
4b426b10 | 1604 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1605 | */ |
2369e827 LL |
1606 | static bool batadv_bla_check_duplist(struct batadv_priv *bat_priv, |
1607 | struct sk_buff *skb, u8 *payload_ptr, | |
1608 | const u8 *orig) | |
fe2da6ff | 1609 | { |
56303d34 | 1610 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1611 | bool ret = false; |
2369e827 LL |
1612 | int i, curr; |
1613 | __be32 crc; | |
fe2da6ff SW |
1614 | |
1615 | /* calculate the crc ... */ | |
2369e827 | 1616 | crc = batadv_skb_crc32(skb, payload_ptr); |
fe2da6ff | 1617 | |
7dac7b76 LL |
1618 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1619 | ||
42d0b044 | 1620 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1621 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1622 | curr %= BATADV_DUPLIST_SIZE; | |
1623 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1624 | |
1625 | /* we can stop searching if the entry is too old ; | |
1626 | * later entries will be even older | |
1627 | */ | |
42d0b044 SE |
1628 | if (batadv_has_timed_out(entry->entrytime, |
1629 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1630 | break; |
1631 | ||
1632 | if (entry->crc != crc) | |
1633 | continue; | |
1634 | ||
2369e827 LL |
1635 | /* are the originators both known and not anonymous? */ |
1636 | if (orig && !is_zero_ether_addr(orig) && | |
1637 | !is_zero_ether_addr(entry->orig)) { | |
1638 | /* If known, check if the new frame came from | |
1639 | * the same originator: | |
1640 | * We are safe to take identical frames from the | |
1641 | * same orig, if known, as multiplications in | |
1642 | * the mesh are detected via the (orig, seqno) pair. | |
1643 | * So we can be a bit more liberal here and allow | |
1644 | * identical frames from the same orig which the source | |
1645 | * host might have sent multiple times on purpose. | |
1646 | */ | |
1647 | if (batadv_compare_eth(entry->orig, orig)) | |
1648 | continue; | |
1649 | } | |
fe2da6ff SW |
1650 | |
1651 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1652 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1653 | */ |
4b426b10 | 1654 | ret = true; |
7dac7b76 | 1655 | goto out; |
fe2da6ff | 1656 | } |
7dac7b76 | 1657 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1658 | * and allow it, its the first occurrence. |
7dac7b76 | 1659 | */ |
807736f6 | 1660 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1661 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1662 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1663 | entry->crc = crc; |
1664 | entry->entrytime = jiffies; | |
2369e827 LL |
1665 | |
1666 | /* known originator */ | |
1667 | if (orig) | |
1668 | ether_addr_copy(entry->orig, orig); | |
1669 | /* anonymous originator */ | |
1670 | else | |
1671 | eth_zero_addr(entry->orig); | |
1672 | ||
807736f6 | 1673 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1674 | |
7dac7b76 LL |
1675 | out: |
1676 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1677 | ||
1678 | return ret; | |
fe2da6ff SW |
1679 | } |
1680 | ||
2369e827 LL |
1681 | /** |
1682 | * batadv_bla_check_ucast_duplist() - Check if a frame is in the broadcast dup. | |
1683 | * @bat_priv: the bat priv with all the soft interface information | |
1684 | * @skb: contains the multicast packet to be checked, decapsulated from a | |
1685 | * unicast_packet | |
1686 | * | |
1687 | * Check if it is on our broadcast list. Another gateway might have sent the | |
1688 | * same packet because it is connected to the same backbone, so we have to | |
1689 | * remove this duplicate. | |
1690 | * | |
1691 | * Return: true if a packet is in the duplicate list, false otherwise. | |
1692 | */ | |
1693 | static bool batadv_bla_check_ucast_duplist(struct batadv_priv *bat_priv, | |
1694 | struct sk_buff *skb) | |
1695 | { | |
1696 | return batadv_bla_check_duplist(bat_priv, skb, (u8 *)skb->data, NULL); | |
1697 | } | |
1698 | ||
1699 | /** | |
1700 | * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. | |
1701 | * @bat_priv: the bat priv with all the soft interface information | |
1702 | * @skb: contains the bcast_packet to be checked | |
1703 | * | |
1704 | * Check if it is on our broadcast list. Another gateway might have sent the | |
1705 | * same packet because it is connected to the same backbone, so we have to | |
1706 | * remove this duplicate. | |
1707 | * | |
1708 | * Return: true if a packet is in the duplicate list, false otherwise. | |
1709 | */ | |
1710 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, | |
1711 | struct sk_buff *skb) | |
1712 | { | |
1713 | struct batadv_bcast_packet *bcast_packet; | |
1714 | u8 *payload_ptr; | |
1715 | ||
1716 | bcast_packet = (struct batadv_bcast_packet *)skb->data; | |
1717 | payload_ptr = (u8 *)(bcast_packet + 1); | |
1718 | ||
1719 | return batadv_bla_check_duplist(bat_priv, skb, payload_ptr, | |
1720 | bcast_packet->orig); | |
1721 | } | |
1722 | ||
1b371d13 | 1723 | /** |
7e9a8c2c | 1724 | * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for |
04e14be6 | 1725 | * the VLAN identified by vid. |
1b371d13 | 1726 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1727 | * @orig: originator mac address |
cfd4f757 | 1728 | * @vid: VLAN identifier |
20ff9d59 | 1729 | * |
62fe710f | 1730 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1731 | */ |
6b5e971a | 1732 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1733 | unsigned short vid) |
20ff9d59 | 1734 | { |
807736f6 | 1735 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1736 | struct hlist_head *head; |
bae98774 | 1737 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1738 | int i; |
1739 | ||
1740 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1741 | return false; |
20ff9d59 SW |
1742 | |
1743 | if (!hash) | |
cfd4f757 | 1744 | return false; |
20ff9d59 SW |
1745 | |
1746 | for (i = 0; i < hash->size; i++) { | |
1747 | head = &hash->table[i]; | |
1748 | ||
1749 | rcu_read_lock(); | |
b67bfe0d | 1750 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1751 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1752 | backbone_gw->vid == vid) { | |
20ff9d59 | 1753 | rcu_read_unlock(); |
cfd4f757 | 1754 | return true; |
20ff9d59 SW |
1755 | } |
1756 | } | |
1757 | rcu_read_unlock(); | |
1758 | } | |
1759 | ||
cfd4f757 | 1760 | return false; |
20ff9d59 SW |
1761 | } |
1762 | ||
2c53040f | 1763 | /** |
7e9a8c2c | 1764 | * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN |
2c53040f | 1765 | * @skb: the frame to be checked |
23721387 SW |
1766 | * @orig_node: the orig_node of the frame |
1767 | * @hdr_size: maximum length of the frame | |
1768 | * | |
4b426b10 SE |
1769 | * Return: true if the orig_node is also a gateway on the soft interface, |
1770 | * otherwise it returns false. | |
23721387 | 1771 | */ |
4b426b10 SE |
1772 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1773 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1774 | { |
bae98774 | 1775 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1776 | unsigned short vid; |
23721387 SW |
1777 | |
1778 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1779 | return false; |
23721387 SW |
1780 | |
1781 | /* first, find out the vid. */ | |
0d125074 | 1782 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1783 | return false; |
23721387 | 1784 | |
c018ad3d | 1785 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1786 | |
1787 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1788 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1789 | orig_node->orig, vid); | |
23721387 | 1790 | if (!backbone_gw) |
4b426b10 | 1791 | return false; |
23721387 | 1792 | |
c8b86c12 | 1793 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1794 | return true; |
23721387 SW |
1795 | } |
1796 | ||
04e14be6 | 1797 | /** |
7e9a8c2c | 1798 | * batadv_bla_free() - free all bla structures |
04e14be6 SW |
1799 | * @bat_priv: the bat priv with all the soft interface information |
1800 | * | |
1801 | * for softinterface free or module unload | |
1802 | */ | |
56303d34 | 1803 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1804 | { |
56303d34 | 1805 | struct batadv_hard_iface *primary_if; |
23721387 | 1806 | |
807736f6 | 1807 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1808 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1809 | |
807736f6 | 1810 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1811 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1812 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1813 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1814 | } |
807736f6 | 1815 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1816 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1817 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1818 | bat_priv->bla.backbone_hash = NULL; | |
23721387 | 1819 | } |
79a0bffb | 1820 | batadv_hardif_put(primary_if); |
23721387 SW |
1821 | } |
1822 | ||
cd9c7bfb | 1823 | /** |
7e9a8c2c | 1824 | * batadv_bla_loopdetect_check() - check and handle a detected loop |
cd9c7bfb SW |
1825 | * @bat_priv: the bat priv with all the soft interface information |
1826 | * @skb: the packet to check | |
1827 | * @primary_if: interface where the request came on | |
1828 | * @vid: the VLAN ID of the frame | |
1829 | * | |
1830 | * Checks if this packet is a loop detect frame which has been sent by us, | |
bccb48c8 | 1831 | * throws an uevent and logs the event if that is the case. |
cd9c7bfb SW |
1832 | * |
1833 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1834 | * otherwise. | |
1835 | */ | |
1836 | static bool | |
1837 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1838 | struct batadv_hard_iface *primary_if, | |
1839 | unsigned short vid) | |
1840 | { | |
1841 | struct batadv_bla_backbone_gw *backbone_gw; | |
1842 | struct ethhdr *ethhdr; | |
5af96b9c | 1843 | bool ret; |
cd9c7bfb SW |
1844 | |
1845 | ethhdr = eth_hdr(skb); | |
1846 | ||
1847 | /* Only check for the MAC address and skip more checks here for | |
1848 | * performance reasons - this function is on the hotpath, after all. | |
1849 | */ | |
1850 | if (!batadv_compare_eth(ethhdr->h_source, | |
1851 | bat_priv->bla.loopdetect_addr)) | |
1852 | return false; | |
1853 | ||
1854 | /* If the packet came too late, don't forward it on the mesh | |
1855 | * but don't consider that as loop. It might be a coincidence. | |
1856 | */ | |
1857 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1858 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1859 | return true; | |
1860 | ||
1861 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1862 | primary_if->net_dev->dev_addr, | |
1863 | vid, true); | |
1864 | if (unlikely(!backbone_gw)) | |
1865 | return true; | |
1866 | ||
5af96b9c ML |
1867 | ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work); |
1868 | ||
21ba5ab2 | 1869 | /* backbone_gw is unreferenced in the report work function |
5af96b9c ML |
1870 | * if queue_work() call was successful |
1871 | */ | |
1872 | if (!ret) | |
1873 | batadv_backbone_gw_put(backbone_gw); | |
cd9c7bfb SW |
1874 | |
1875 | return true; | |
1876 | } | |
1877 | ||
2c53040f | 1878 | /** |
7e9a8c2c | 1879 | * batadv_bla_rx() - check packets coming from the mesh. |
2c53040f | 1880 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1881 | * @skb: the frame to be checked |
1882 | * @vid: the VLAN ID of the frame | |
74c09b72 | 1883 | * @packet_type: the batman packet type this frame came in |
23721387 | 1884 | * |
04e14be6 | 1885 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1886 | * * we have to race for a claim |
1887 | * * if the frame is allowed on the LAN | |
1888 | * | |
bccb48c8 | 1889 | * In these cases, the skb is further handled by this function |
62fe710f | 1890 | * |
4b426b10 SE |
1891 | * Return: true if handled, otherwise it returns false and the caller shall |
1892 | * further process the skb. | |
23721387 | 1893 | */ |
4b426b10 | 1894 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
74c09b72 | 1895 | unsigned short vid, int packet_type) |
23721387 | 1896 | { |
3db0decf | 1897 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1898 | struct ethhdr *ethhdr; |
712bbfe4 | 1899 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1900 | struct batadv_hard_iface *primary_if; |
3db0decf | 1901 | bool own_claim; |
4b426b10 | 1902 | bool ret; |
23721387 | 1903 | |
7ed4be95 | 1904 | ethhdr = eth_hdr(skb); |
23721387 | 1905 | |
e5d89254 | 1906 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1907 | if (!primary_if) |
1908 | goto handled; | |
1909 | ||
1910 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1911 | goto allow; | |
1912 | ||
cd9c7bfb SW |
1913 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1914 | goto handled; | |
1915 | ||
807736f6 | 1916 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
74c09b72 LL |
1917 | /* don't allow multicast packets while requests are in flight */ |
1918 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1919 | /* Both broadcast flooding or multicast-via-unicasts | |
1920 | * delivery might send to multiple backbone gateways | |
1921 | * sharing the same LAN and therefore need to coordinate | |
1922 | * which backbone gateway forwards into the LAN, | |
1923 | * by claiming the payload source address. | |
1924 | * | |
1925 | * Broadcast flooding and multicast-via-unicasts | |
1926 | * delivery use the following two batman packet types. | |
1927 | * Note: explicitly exclude BATADV_UNICAST_4ADDR, | |
1928 | * as the DHCP gateway feature will send explicitly | |
1929 | * to only one BLA gateway, so the claiming process | |
1930 | * should be avoided there. | |
1931 | */ | |
1932 | if (packet_type == BATADV_BCAST || | |
1933 | packet_type == BATADV_UNICAST) | |
1934 | goto handled; | |
23721387 | 1935 | |
2369e827 LL |
1936 | /* potential duplicates from foreign BLA backbone gateways via |
1937 | * multicast-in-unicast packets | |
1938 | */ | |
1939 | if (is_multicast_ether_addr(ethhdr->h_dest) && | |
1940 | packet_type == BATADV_UNICAST && | |
1941 | batadv_bla_check_ucast_duplist(bat_priv, skb)) | |
1942 | goto handled; | |
23721387 | 1943 | |
8fdd0153 | 1944 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1945 | search_claim.vid = vid; |
3b300de3 | 1946 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1947 | |
1948 | if (!claim) { | |
1949 | /* possible optimization: race for a claim */ | |
1950 | /* No claim exists yet, claim it for us! | |
1951 | */ | |
4dd72f73 AP |
1952 | |
1953 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
1954 | "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", |
1955 | __func__, ethhdr->h_source, | |
4dd72f73 AP |
1956 | batadv_is_my_client(bat_priv, |
1957 | ethhdr->h_source, vid) ? | |
1958 | "yes" : "no"); | |
3b300de3 SE |
1959 | batadv_handle_claim(bat_priv, primary_if, |
1960 | primary_if->net_dev->dev_addr, | |
1961 | ethhdr->h_source, vid); | |
23721387 SW |
1962 | goto allow; |
1963 | } | |
1964 | ||
1965 | /* if it is our own claim ... */ | |
3db0decf SE |
1966 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1967 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1968 | primary_if->net_dev->dev_addr); | |
1969 | batadv_backbone_gw_put(backbone_gw); | |
1970 | ||
1971 | if (own_claim) { | |
23721387 SW |
1972 | /* ... allow it in any case */ |
1973 | claim->lasttime = jiffies; | |
1974 | goto allow; | |
1975 | } | |
1976 | ||
74c09b72 LL |
1977 | /* if it is a multicast ... */ |
1978 | if (is_multicast_ether_addr(ethhdr->h_dest) && | |
1979 | (packet_type == BATADV_BCAST || packet_type == BATADV_UNICAST)) { | |
2d3f6ccc SW |
1980 | /* ... drop it. the responsible gateway is in charge. |
1981 | * | |
74c09b72 | 1982 | * We need to check packet type because with the gateway |
2d3f6ccc | 1983 | * feature, broadcasts (like DHCP requests) may be sent |
74c09b72 | 1984 | * using a unicast 4 address packet type. See comment above. |
2d3f6ccc | 1985 | */ |
23721387 SW |
1986 | goto handled; |
1987 | } else { | |
1988 | /* seems the client considers us as its best gateway. | |
1989 | * send a claim and update the claim table | |
1990 | * immediately. | |
1991 | */ | |
3b300de3 SE |
1992 | batadv_handle_claim(bat_priv, primary_if, |
1993 | primary_if->net_dev->dev_addr, | |
1994 | ethhdr->h_source, vid); | |
23721387 SW |
1995 | goto allow; |
1996 | } | |
1997 | allow: | |
3b300de3 | 1998 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1999 | ret = false; |
23721387 SW |
2000 | goto out; |
2001 | ||
2002 | handled: | |
2003 | kfree_skb(skb); | |
4b426b10 | 2004 | ret = true; |
23721387 SW |
2005 | |
2006 | out: | |
79a0bffb SE |
2007 | batadv_hardif_put(primary_if); |
2008 | batadv_claim_put(claim); | |
23721387 SW |
2009 | return ret; |
2010 | } | |
2011 | ||
2c53040f | 2012 | /** |
7e9a8c2c | 2013 | * batadv_bla_tx() - check packets going into the mesh |
2c53040f | 2014 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
2015 | * @skb: the frame to be checked |
2016 | * @vid: the VLAN ID of the frame | |
2017 | * | |
04e14be6 | 2018 | * batadv_bla_tx checks if: |
23721387 SW |
2019 | * * a claim was received which has to be processed |
2020 | * * the frame is allowed on the mesh | |
2021 | * | |
62fe710f | 2022 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
2023 | * |
2024 | * This call might reallocate skb data. | |
62fe710f | 2025 | * |
4b426b10 SE |
2026 | * Return: true if handled, otherwise it returns false and the caller shall |
2027 | * further process the skb. | |
23721387 | 2028 | */ |
4b426b10 SE |
2029 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2030 | unsigned short vid) | |
23721387 SW |
2031 | { |
2032 | struct ethhdr *ethhdr; | |
712bbfe4 | 2033 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 2034 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 2035 | struct batadv_hard_iface *primary_if; |
3db0decf | 2036 | bool client_roamed; |
4b426b10 | 2037 | bool ret = false; |
23721387 | 2038 | |
e5d89254 | 2039 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
2040 | if (!primary_if) |
2041 | goto out; | |
2042 | ||
2043 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
2044 | goto allow; | |
2045 | ||
3b300de3 | 2046 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
2047 | goto handled; |
2048 | ||
7ed4be95 | 2049 | ethhdr = eth_hdr(skb); |
23721387 | 2050 | |
807736f6 | 2051 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
2052 | /* don't allow broadcasts while requests are in flight */ |
2053 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
2054 | goto handled; | |
2055 | ||
8fdd0153 | 2056 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
2057 | search_claim.vid = vid; |
2058 | ||
3b300de3 | 2059 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
2060 | |
2061 | /* if no claim exists, allow it. */ | |
2062 | if (!claim) | |
2063 | goto allow; | |
2064 | ||
2065 | /* check if we are responsible. */ | |
3db0decf SE |
2066 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2067 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
2068 | primary_if->net_dev->dev_addr); | |
2069 | batadv_backbone_gw_put(backbone_gw); | |
2070 | ||
2071 | if (client_roamed) { | |
23721387 SW |
2072 | /* if yes, the client has roamed and we have |
2073 | * to unclaim it. | |
2074 | */ | |
a3a5129e AP |
2075 | if (batadv_has_timed_out(claim->lasttime, 100)) { |
2076 | /* only unclaim if the last claim entry is | |
2077 | * older than 100 ms to make sure we really | |
2078 | * have a roaming client here. | |
2079 | */ | |
22f0502e SE |
2080 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", |
2081 | __func__, ethhdr->h_source); | |
a3a5129e AP |
2082 | batadv_handle_unclaim(bat_priv, primary_if, |
2083 | primary_if->net_dev->dev_addr, | |
2084 | ethhdr->h_source, vid); | |
2085 | goto allow; | |
2086 | } else { | |
22f0502e SE |
2087 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", |
2088 | __func__, ethhdr->h_source); | |
a3a5129e AP |
2089 | goto handled; |
2090 | } | |
23721387 SW |
2091 | } |
2092 | ||
2093 | /* check if it is a multicast/broadcast frame */ | |
2094 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
2095 | /* drop it. the responsible gateway has forwarded it into | |
2096 | * the backbone network. | |
2097 | */ | |
2098 | goto handled; | |
2099 | } else { | |
2100 | /* we must allow it. at least if we are | |
2101 | * responsible for the DESTINATION. | |
2102 | */ | |
2103 | goto allow; | |
2104 | } | |
2105 | allow: | |
3b300de3 | 2106 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 2107 | ret = false; |
23721387 SW |
2108 | goto out; |
2109 | handled: | |
4b426b10 | 2110 | ret = true; |
23721387 | 2111 | out: |
79a0bffb SE |
2112 | batadv_hardif_put(primary_if); |
2113 | batadv_claim_put(claim); | |
23721387 SW |
2114 | return ret; |
2115 | } | |
9bf8e4d4 | 2116 | |
04f3f5bf | 2117 | /** |
7e9a8c2c | 2118 | * batadv_bla_claim_dump_entry() - dump one entry of the claim table |
04f3f5bf AL |
2119 | * to a netlink socket |
2120 | * @msg: buffer for the message | |
2121 | * @portid: netlink port | |
24d71b92 | 2122 | * @cb: Control block containing additional options |
04f3f5bf AL |
2123 | * @primary_if: primary interface |
2124 | * @claim: entry to dump | |
2125 | * | |
2126 | * Return: 0 or error code. | |
2127 | */ | |
2128 | static int | |
24d71b92 SE |
2129 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, |
2130 | struct netlink_callback *cb, | |
04f3f5bf AL |
2131 | struct batadv_hard_iface *primary_if, |
2132 | struct batadv_bla_claim *claim) | |
2133 | { | |
47ce5f1e | 2134 | const u8 *primary_addr = primary_if->net_dev->dev_addr; |
04f3f5bf AL |
2135 | u16 backbone_crc; |
2136 | bool is_own; | |
2137 | void *hdr; | |
2138 | int ret = -EINVAL; | |
2139 | ||
24d71b92 SE |
2140 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
2141 | &batadv_netlink_family, NLM_F_MULTI, | |
2142 | BATADV_CMD_GET_BLA_CLAIM); | |
04f3f5bf AL |
2143 | if (!hdr) { |
2144 | ret = -ENOBUFS; | |
2145 | goto out; | |
2146 | } | |
2147 | ||
24d71b92 SE |
2148 | genl_dump_check_consistent(cb, hdr); |
2149 | ||
04f3f5bf AL |
2150 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
2151 | primary_addr); | |
2152 | ||
2153 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
2154 | backbone_crc = claim->backbone_gw->crc; | |
2155 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
2156 | ||
2157 | if (is_own) | |
2158 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2159 | genlmsg_cancel(msg, hdr); | |
2160 | goto out; | |
2161 | } | |
2162 | ||
2163 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || | |
2164 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || | |
2165 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2166 | claim->backbone_gw->orig) || | |
2167 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2168 | backbone_crc)) { | |
2169 | genlmsg_cancel(msg, hdr); | |
2170 | goto out; | |
2171 | } | |
2172 | ||
2173 | genlmsg_end(msg, hdr); | |
2174 | ret = 0; | |
2175 | ||
2176 | out: | |
2177 | return ret; | |
2178 | } | |
2179 | ||
2180 | /** | |
7e9a8c2c | 2181 | * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table |
04f3f5bf AL |
2182 | * to a netlink socket |
2183 | * @msg: buffer for the message | |
2184 | * @portid: netlink port | |
24d71b92 | 2185 | * @cb: Control block containing additional options |
04f3f5bf | 2186 | * @primary_if: primary interface |
24d71b92 SE |
2187 | * @hash: hash to dump |
2188 | * @bucket: bucket index to dump | |
04f3f5bf AL |
2189 | * @idx_skip: How many entries to skip |
2190 | * | |
2191 | * Return: always 0. | |
2192 | */ | |
2193 | static int | |
24d71b92 SE |
2194 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, |
2195 | struct netlink_callback *cb, | |
04f3f5bf | 2196 | struct batadv_hard_iface *primary_if, |
24d71b92 SE |
2197 | struct batadv_hashtable *hash, unsigned int bucket, |
2198 | int *idx_skip) | |
04f3f5bf AL |
2199 | { |
2200 | struct batadv_bla_claim *claim; | |
2201 | int idx = 0; | |
b0264ecd | 2202 | int ret = 0; |
04f3f5bf | 2203 | |
24d71b92 SE |
2204 | spin_lock_bh(&hash->list_locks[bucket]); |
2205 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
2206 | ||
2207 | hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) { | |
04f3f5bf AL |
2208 | if (idx++ < *idx_skip) |
2209 | continue; | |
b0264ecd | 2210 | |
24d71b92 | 2211 | ret = batadv_bla_claim_dump_entry(msg, portid, cb, |
b0264ecd SE |
2212 | primary_if, claim); |
2213 | if (ret) { | |
04f3f5bf AL |
2214 | *idx_skip = idx - 1; |
2215 | goto unlock; | |
2216 | } | |
2217 | } | |
2218 | ||
b0264ecd | 2219 | *idx_skip = 0; |
04f3f5bf | 2220 | unlock: |
24d71b92 | 2221 | spin_unlock_bh(&hash->list_locks[bucket]); |
b0264ecd | 2222 | return ret; |
04f3f5bf AL |
2223 | } |
2224 | ||
2225 | /** | |
7e9a8c2c | 2226 | * batadv_bla_claim_dump() - dump claim table to a netlink socket |
04f3f5bf AL |
2227 | * @msg: buffer for the message |
2228 | * @cb: callback structure containing arguments | |
2229 | * | |
2230 | * Return: message length. | |
2231 | */ | |
2232 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2233 | { | |
2234 | struct batadv_hard_iface *primary_if = NULL; | |
2235 | int portid = NETLINK_CB(cb->skb).portid; | |
2236 | struct net *net = sock_net(cb->skb->sk); | |
2237 | struct net_device *soft_iface; | |
2238 | struct batadv_hashtable *hash; | |
2239 | struct batadv_priv *bat_priv; | |
2240 | int bucket = cb->args[0]; | |
04f3f5bf AL |
2241 | int idx = cb->args[1]; |
2242 | int ifindex; | |
2243 | int ret = 0; | |
2244 | ||
2245 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2246 | BATADV_ATTR_MESH_IFINDEX); | |
2247 | if (!ifindex) | |
2248 | return -EINVAL; | |
2249 | ||
2250 | soft_iface = dev_get_by_index(net, ifindex); | |
2251 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2252 | ret = -ENODEV; | |
2253 | goto out; | |
2254 | } | |
2255 | ||
2256 | bat_priv = netdev_priv(soft_iface); | |
2257 | hash = bat_priv->bla.claim_hash; | |
2258 | ||
2259 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2260 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2261 | ret = -ENOENT; | |
2262 | goto out; | |
2263 | } | |
2264 | ||
2265 | while (bucket < hash->size) { | |
24d71b92 SE |
2266 | if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if, |
2267 | hash, bucket, &idx)) | |
04f3f5bf AL |
2268 | break; |
2269 | bucket++; | |
2270 | } | |
2271 | ||
2272 | cb->args[0] = bucket; | |
2273 | cb->args[1] = idx; | |
2274 | ||
2275 | ret = msg->len; | |
2276 | ||
2277 | out: | |
79a0bffb | 2278 | batadv_hardif_put(primary_if); |
04f3f5bf | 2279 | |
1160dfa1 | 2280 | dev_put(soft_iface); |
04f3f5bf AL |
2281 | |
2282 | return ret; | |
2283 | } | |
2284 | ||
ea4152e1 | 2285 | /** |
7e9a8c2c SE |
2286 | * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a |
2287 | * netlink socket | |
ea4152e1 SW |
2288 | * @msg: buffer for the message |
2289 | * @portid: netlink port | |
b00d0e6a | 2290 | * @cb: Control block containing additional options |
ea4152e1 SW |
2291 | * @primary_if: primary interface |
2292 | * @backbone_gw: entry to dump | |
2293 | * | |
2294 | * Return: 0 or error code. | |
2295 | */ | |
2296 | static int | |
b00d0e6a SE |
2297 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, |
2298 | struct netlink_callback *cb, | |
ea4152e1 SW |
2299 | struct batadv_hard_iface *primary_if, |
2300 | struct batadv_bla_backbone_gw *backbone_gw) | |
2301 | { | |
47ce5f1e | 2302 | const u8 *primary_addr = primary_if->net_dev->dev_addr; |
ea4152e1 SW |
2303 | u16 backbone_crc; |
2304 | bool is_own; | |
2305 | int msecs; | |
2306 | void *hdr; | |
2307 | int ret = -EINVAL; | |
2308 | ||
b00d0e6a SE |
2309 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
2310 | &batadv_netlink_family, NLM_F_MULTI, | |
2311 | BATADV_CMD_GET_BLA_BACKBONE); | |
ea4152e1 SW |
2312 | if (!hdr) { |
2313 | ret = -ENOBUFS; | |
2314 | goto out; | |
2315 | } | |
2316 | ||
b00d0e6a SE |
2317 | genl_dump_check_consistent(cb, hdr); |
2318 | ||
ea4152e1 SW |
2319 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); |
2320 | ||
2321 | spin_lock_bh(&backbone_gw->crc_lock); | |
2322 | backbone_crc = backbone_gw->crc; | |
2323 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2324 | ||
2325 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); | |
2326 | ||
2327 | if (is_own) | |
2328 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2329 | genlmsg_cancel(msg, hdr); | |
2330 | goto out; | |
2331 | } | |
2332 | ||
2333 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2334 | backbone_gw->orig) || | |
2335 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || | |
2336 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2337 | backbone_crc) || | |
2338 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { | |
2339 | genlmsg_cancel(msg, hdr); | |
2340 | goto out; | |
2341 | } | |
2342 | ||
2343 | genlmsg_end(msg, hdr); | |
2344 | ret = 0; | |
2345 | ||
2346 | out: | |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | /** | |
7e9a8c2c SE |
2351 | * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to |
2352 | * a netlink socket | |
ea4152e1 SW |
2353 | * @msg: buffer for the message |
2354 | * @portid: netlink port | |
b00d0e6a | 2355 | * @cb: Control block containing additional options |
ea4152e1 | 2356 | * @primary_if: primary interface |
b00d0e6a SE |
2357 | * @hash: hash to dump |
2358 | * @bucket: bucket index to dump | |
ea4152e1 SW |
2359 | * @idx_skip: How many entries to skip |
2360 | * | |
2361 | * Return: always 0. | |
2362 | */ | |
2363 | static int | |
b00d0e6a SE |
2364 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, |
2365 | struct netlink_callback *cb, | |
ea4152e1 | 2366 | struct batadv_hard_iface *primary_if, |
b00d0e6a SE |
2367 | struct batadv_hashtable *hash, |
2368 | unsigned int bucket, int *idx_skip) | |
ea4152e1 SW |
2369 | { |
2370 | struct batadv_bla_backbone_gw *backbone_gw; | |
2371 | int idx = 0; | |
fce672db | 2372 | int ret = 0; |
ea4152e1 | 2373 | |
b00d0e6a SE |
2374 | spin_lock_bh(&hash->list_locks[bucket]); |
2375 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
2376 | ||
2377 | hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) { | |
ea4152e1 SW |
2378 | if (idx++ < *idx_skip) |
2379 | continue; | |
fce672db | 2380 | |
b00d0e6a | 2381 | ret = batadv_bla_backbone_dump_entry(msg, portid, cb, |
fce672db SE |
2382 | primary_if, backbone_gw); |
2383 | if (ret) { | |
ea4152e1 SW |
2384 | *idx_skip = idx - 1; |
2385 | goto unlock; | |
2386 | } | |
2387 | } | |
2388 | ||
fce672db | 2389 | *idx_skip = 0; |
ea4152e1 | 2390 | unlock: |
b00d0e6a | 2391 | spin_unlock_bh(&hash->list_locks[bucket]); |
fce672db | 2392 | return ret; |
ea4152e1 SW |
2393 | } |
2394 | ||
2395 | /** | |
7e9a8c2c | 2396 | * batadv_bla_backbone_dump() - dump backbone table to a netlink socket |
ea4152e1 SW |
2397 | * @msg: buffer for the message |
2398 | * @cb: callback structure containing arguments | |
2399 | * | |
2400 | * Return: message length. | |
2401 | */ | |
2402 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2403 | { | |
2404 | struct batadv_hard_iface *primary_if = NULL; | |
2405 | int portid = NETLINK_CB(cb->skb).portid; | |
2406 | struct net *net = sock_net(cb->skb->sk); | |
2407 | struct net_device *soft_iface; | |
2408 | struct batadv_hashtable *hash; | |
2409 | struct batadv_priv *bat_priv; | |
2410 | int bucket = cb->args[0]; | |
ea4152e1 SW |
2411 | int idx = cb->args[1]; |
2412 | int ifindex; | |
2413 | int ret = 0; | |
2414 | ||
2415 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2416 | BATADV_ATTR_MESH_IFINDEX); | |
2417 | if (!ifindex) | |
2418 | return -EINVAL; | |
2419 | ||
2420 | soft_iface = dev_get_by_index(net, ifindex); | |
2421 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2422 | ret = -ENODEV; | |
2423 | goto out; | |
2424 | } | |
2425 | ||
2426 | bat_priv = netdev_priv(soft_iface); | |
2427 | hash = bat_priv->bla.backbone_hash; | |
2428 | ||
2429 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2430 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2431 | ret = -ENOENT; | |
2432 | goto out; | |
2433 | } | |
2434 | ||
2435 | while (bucket < hash->size) { | |
b00d0e6a SE |
2436 | if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if, |
2437 | hash, bucket, &idx)) | |
ea4152e1 SW |
2438 | break; |
2439 | bucket++; | |
2440 | } | |
2441 | ||
2442 | cb->args[0] = bucket; | |
2443 | cb->args[1] = idx; | |
2444 | ||
2445 | ret = msg->len; | |
2446 | ||
2447 | out: | |
79a0bffb | 2448 | batadv_hardif_put(primary_if); |
ea4152e1 | 2449 | |
1160dfa1 | 2450 | dev_put(soft_iface); |
ea4152e1 SW |
2451 | |
2452 | return ret; | |
2453 | } | |
00311de5 AP |
2454 | |
2455 | #ifdef CONFIG_BATMAN_ADV_DAT | |
2456 | /** | |
7e9a8c2c | 2457 | * batadv_bla_check_claim() - check if address is claimed |
00311de5 AP |
2458 | * |
2459 | * @bat_priv: the bat priv with all the soft interface information | |
2460 | * @addr: mac address of which the claim status is checked | |
2461 | * @vid: the VLAN ID | |
2462 | * | |
2463 | * addr is checked if this address is claimed by the local device itself. | |
2464 | * | |
2465 | * Return: true if bla is disabled or the mac is claimed by the device, | |
2466 | * false if the device addr is already claimed by another gateway | |
2467 | */ | |
2468 | bool batadv_bla_check_claim(struct batadv_priv *bat_priv, | |
2469 | u8 *addr, unsigned short vid) | |
2470 | { | |
2471 | struct batadv_bla_claim search_claim; | |
2472 | struct batadv_bla_claim *claim = NULL; | |
2473 | struct batadv_hard_iface *primary_if = NULL; | |
2474 | bool ret = true; | |
2475 | ||
2476 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
2477 | return ret; | |
2478 | ||
2479 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2480 | if (!primary_if) | |
2481 | return ret; | |
2482 | ||
2483 | /* First look if the mac address is claimed */ | |
2484 | ether_addr_copy(search_claim.addr, addr); | |
2485 | search_claim.vid = vid; | |
2486 | ||
2487 | claim = batadv_claim_hash_find(bat_priv, &search_claim); | |
2488 | ||
2489 | /* If there is a claim and we are not owner of the claim, | |
2490 | * return false. | |
2491 | */ | |
2492 | if (claim) { | |
2493 | if (!batadv_compare_eth(claim->backbone_gw->orig, | |
2494 | primary_if->net_dev->dev_addr)) | |
2495 | ret = false; | |
2496 | batadv_claim_put(claim); | |
2497 | } | |
2498 | ||
2499 | batadv_hardif_put(primary_if); | |
2500 | return ret; | |
2501 | } | |
2502 | #endif |