Commit | Line | Data |
---|---|---|
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> | |
23721387 | 13 | #include <linux/crc16.h> |
1e2c2a4f SE |
14 | #include <linux/errno.h> |
15 | #include <linux/etherdevice.h> | |
b92b94ac | 16 | #include <linux/gfp.h> |
23721387 | 17 | #include <linux/if_arp.h> |
1e2c2a4f | 18 | #include <linux/if_ether.h> |
23721387 | 19 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
20 | #include <linux/jhash.h> |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/kernel.h> | |
06e56ded | 23 | #include <linux/kref.h> |
1e2c2a4f SE |
24 | #include <linux/list.h> |
25 | #include <linux/lockdep.h> | |
26 | #include <linux/netdevice.h> | |
04f3f5bf | 27 | #include <linux/netlink.h> |
1e2c2a4f SE |
28 | #include <linux/rculist.h> |
29 | #include <linux/rcupdate.h> | |
1e2c2a4f SE |
30 | #include <linux/skbuff.h> |
31 | #include <linux/slab.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/stddef.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <net/arp.h> | |
04f3f5bf AL |
37 | #include <net/genetlink.h> |
38 | #include <net/netlink.h> | |
39 | #include <net/sock.h> | |
fec149f5 | 40 | #include <uapi/linux/batadv_packet.h> |
04f3f5bf | 41 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f SE |
42 | |
43 | #include "hard-interface.h" | |
44 | #include "hash.h" | |
ba412080 | 45 | #include "log.h" |
04f3f5bf | 46 | #include "netlink.h" |
1e2c2a4f | 47 | #include "originator.h" |
04f3f5bf | 48 | #include "soft-interface.h" |
1e2c2a4f | 49 | #include "translation-table.h" |
23721387 | 50 | |
6b5e971a | 51 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 52 | |
3b300de3 | 53 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
54 | static void |
55 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
56 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 57 | |
62fe710f | 58 | /** |
7e9a8c2c | 59 | * batadv_choose_claim() - choose the right bucket for a claim. |
04e14be6 SW |
60 | * @data: data to hash |
61 | * @size: size of the hash table | |
62fe710f | 62 | * |
04e14be6 | 63 | * Return: the hash index of the claim |
62fe710f | 64 | */ |
6b5e971a | 65 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 66 | { |
712bbfe4 | 67 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 68 | u32 hash = 0; |
23721387 | 69 | |
36fd61cb SE |
70 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
71 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
72 | |
73 | return hash % size; | |
74 | } | |
75 | ||
62fe710f | 76 | /** |
7e9a8c2c | 77 | * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
04e14be6 SW |
78 | * @data: data to hash |
79 | * @size: size of the hash table | |
62fe710f | 80 | * |
04e14be6 | 81 | * Return: the hash index of the backbone gateway |
62fe710f | 82 | */ |
6b5e971a | 83 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 84 | { |
097930e8 | 85 | const struct batadv_bla_backbone_gw *gw; |
6b5e971a | 86 | u32 hash = 0; |
23721387 | 87 | |
097930e8 LL |
88 | gw = (struct batadv_bla_backbone_gw *)data; |
89 | hash = jhash(&gw->orig, sizeof(gw->orig), hash); | |
90 | hash = jhash(&gw->vid, sizeof(gw->vid), hash); | |
23721387 SW |
91 | |
92 | return hash % size; | |
93 | } | |
94 | ||
04e14be6 | 95 | /** |
7e9a8c2c | 96 | * batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
04e14be6 SW |
97 | * @node: list node of the first entry to compare |
98 | * @data2: pointer to the second backbone gateway | |
99 | * | |
4b426b10 | 100 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 101 | */ |
4b426b10 SE |
102 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
103 | const void *data2) | |
23721387 | 104 | { |
bae98774 | 105 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 106 | hash_entry); |
4f248cff SE |
107 | const struct batadv_bla_backbone_gw *gw1 = data1; |
108 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 109 | |
c76d1525 | 110 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 111 | return false; |
c76d1525 SW |
112 | |
113 | if (gw1->vid != gw2->vid) | |
4b426b10 | 114 | return false; |
c76d1525 | 115 | |
4b426b10 | 116 | return true; |
23721387 SW |
117 | } |
118 | ||
04e14be6 | 119 | /** |
7e9a8c2c | 120 | * batadv_compare_claim() - compare address and vid of two claims |
04e14be6 SW |
121 | * @node: list node of the first entry to compare |
122 | * @data2: pointer to the second claims | |
123 | * | |
4b426b10 | 124 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 125 | */ |
4b426b10 SE |
126 | static bool batadv_compare_claim(const struct hlist_node *node, |
127 | const void *data2) | |
23721387 | 128 | { |
712bbfe4 | 129 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 130 | hash_entry); |
4f248cff SE |
131 | const struct batadv_bla_claim *cl1 = data1; |
132 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
133 | |
134 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 135 | return false; |
c76d1525 SW |
136 | |
137 | if (cl1->vid != cl2->vid) | |
4b426b10 | 138 | return false; |
23721387 | 139 | |
4b426b10 | 140 | return true; |
23721387 SW |
141 | } |
142 | ||
04e14be6 | 143 | /** |
7e9a8c2c | 144 | * batadv_backbone_gw_release() - release backbone gw from lists and queue for |
06e56ded SE |
145 | * free after rcu grace period |
146 | * @ref: kref pointer of the backbone gw | |
147 | */ | |
148 | static void batadv_backbone_gw_release(struct kref *ref) | |
149 | { | |
150 | struct batadv_bla_backbone_gw *backbone_gw; | |
151 | ||
152 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
153 | refcount); | |
154 | ||
155 | kfree_rcu(backbone_gw, rcu); | |
156 | } | |
157 | ||
158 | /** | |
7e9a8c2c | 159 | * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
c8b86c12 | 160 | * release it |
04e14be6 SW |
161 | * @backbone_gw: backbone gateway to be free'd |
162 | */ | |
c8b86c12 | 163 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 164 | { |
06e56ded | 165 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
166 | } |
167 | ||
04e14be6 | 168 | /** |
7e9a8c2c SE |
169 | * batadv_claim_release() - release claim from lists and queue for free after |
170 | * rcu grace period | |
04e14be6 SW |
171 | * @ref: kref pointer of the claim |
172 | */ | |
71b7e3d3 | 173 | static void batadv_claim_release(struct kref *ref) |
23721387 | 174 | { |
71b7e3d3 | 175 | struct batadv_bla_claim *claim; |
3db0decf | 176 | struct batadv_bla_backbone_gw *old_backbone_gw; |
71b7e3d3 SE |
177 | |
178 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
179 | ||
3db0decf SE |
180 | spin_lock_bh(&claim->backbone_lock); |
181 | old_backbone_gw = claim->backbone_gw; | |
182 | claim->backbone_gw = NULL; | |
183 | spin_unlock_bh(&claim->backbone_lock); | |
184 | ||
185 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
186 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
187 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
188 | ||
189 | batadv_backbone_gw_put(old_backbone_gw); | |
190 | ||
63b39927 | 191 | kfree_rcu(claim, rcu); |
23721387 SW |
192 | } |
193 | ||
04e14be6 | 194 | /** |
7e9a8c2c | 195 | * batadv_claim_put() - decrement the claim refcounter and possibly release it |
04e14be6 SW |
196 | * @claim: claim to be free'd |
197 | */ | |
321e3e08 | 198 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
23721387 | 199 | { |
71b7e3d3 | 200 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
201 | } |
202 | ||
1b371d13 | 203 | /** |
7e9a8c2c | 204 | * batadv_claim_hash_find() - looks for a claim in the claim hash |
1b371d13 | 205 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
206 | * @data: search data (may be local/static data) |
207 | * | |
62fe710f | 208 | * Return: claim if found or NULL otherwise. |
23721387 | 209 | */ |
6fc77a54 SE |
210 | static struct batadv_bla_claim * |
211 | batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
212 | struct batadv_bla_claim *data) | |
23721387 | 213 | { |
807736f6 | 214 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 215 | struct hlist_head *head; |
712bbfe4 ML |
216 | struct batadv_bla_claim *claim; |
217 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
218 | int index; |
219 | ||
220 | if (!hash) | |
221 | return NULL; | |
222 | ||
3b300de3 | 223 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
224 | head = &hash->table[index]; |
225 | ||
226 | rcu_read_lock(); | |
b67bfe0d | 227 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 228 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
229 | continue; |
230 | ||
71b7e3d3 | 231 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
232 | continue; |
233 | ||
234 | claim_tmp = claim; | |
235 | break; | |
236 | } | |
237 | rcu_read_unlock(); | |
238 | ||
239 | return claim_tmp; | |
240 | } | |
241 | ||
2c53040f | 242 | /** |
7e9a8c2c | 243 | * batadv_backbone_hash_find() - looks for a backbone gateway in the hash |
2c53040f | 244 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
245 | * @addr: the address of the originator |
246 | * @vid: the VLAN ID | |
247 | * | |
04e14be6 | 248 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 249 | */ |
bae98774 | 250 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
251 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
252 | unsigned short vid) | |
23721387 | 253 | { |
807736f6 | 254 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 255 | struct hlist_head *head; |
bae98774 ML |
256 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
257 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
258 | int index; |
259 | ||
260 | if (!hash) | |
261 | return NULL; | |
262 | ||
8fdd0153 | 263 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
264 | search_entry.vid = vid; |
265 | ||
3b300de3 | 266 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
267 | head = &hash->table[index]; |
268 | ||
269 | rcu_read_lock(); | |
b67bfe0d | 270 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
271 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
272 | &search_entry)) | |
23721387 SW |
273 | continue; |
274 | ||
06e56ded | 275 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
276 | continue; |
277 | ||
278 | backbone_gw_tmp = backbone_gw; | |
279 | break; | |
280 | } | |
281 | rcu_read_unlock(); | |
282 | ||
283 | return backbone_gw_tmp; | |
284 | } | |
285 | ||
04e14be6 | 286 | /** |
7e9a8c2c | 287 | * batadv_bla_del_backbone_claims() - delete all claims for a backbone |
04e14be6 SW |
288 | * @backbone_gw: backbone gateway where the claims should be removed |
289 | */ | |
56303d34 | 290 | static void |
bae98774 | 291 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 292 | { |
5bf74e9c | 293 | struct batadv_hashtable *hash; |
b67bfe0d | 294 | struct hlist_node *node_tmp; |
23721387 | 295 | struct hlist_head *head; |
712bbfe4 | 296 | struct batadv_bla_claim *claim; |
23721387 SW |
297 | int i; |
298 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
299 | ||
807736f6 | 300 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
301 | if (!hash) |
302 | return; | |
303 | ||
304 | for (i = 0; i < hash->size; i++) { | |
305 | head = &hash->table[i]; | |
306 | list_lock = &hash->list_locks[i]; | |
307 | ||
308 | spin_lock_bh(list_lock); | |
b67bfe0d | 309 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 310 | head, hash_entry) { |
23721387 SW |
311 | if (claim->backbone_gw != backbone_gw) |
312 | continue; | |
313 | ||
321e3e08 | 314 | batadv_claim_put(claim); |
b67bfe0d | 315 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
316 | } |
317 | spin_unlock_bh(list_lock); | |
318 | } | |
319 | ||
3f68785e | 320 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 321 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 322 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 323 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
324 | } |
325 | ||
2c53040f | 326 | /** |
7e9a8c2c | 327 | * batadv_bla_send_claim() - sends a claim frame according to the provided info |
2c53040f | 328 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 329 | * @mac: the mac address to be announced within the claim |
23721387 SW |
330 | * @vid: the VLAN ID |
331 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 332 | */ |
6b5e971a | 333 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 334 | unsigned short vid, int claimtype) |
23721387 SW |
335 | { |
336 | struct sk_buff *skb; | |
337 | struct ethhdr *ethhdr; | |
56303d34 | 338 | struct batadv_hard_iface *primary_if; |
23721387 | 339 | struct net_device *soft_iface; |
6b5e971a | 340 | u8 *hw_src; |
96412690 | 341 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 342 | __be32 zeroip = 0; |
23721387 | 343 | |
e5d89254 | 344 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
345 | if (!primary_if) |
346 | return; | |
347 | ||
807736f6 | 348 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 349 | sizeof(local_claim_dest)); |
23721387 SW |
350 | local_claim_dest.type = claimtype; |
351 | ||
352 | soft_iface = primary_if->soft_iface; | |
353 | ||
354 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
355 | /* IP DST: 0.0.0.0 */ | |
356 | zeroip, | |
357 | primary_if->soft_iface, | |
358 | /* IP SRC: 0.0.0.0 */ | |
359 | zeroip, | |
360 | /* Ethernet DST: Broadcast */ | |
361 | NULL, | |
362 | /* Ethernet SRC/HW SRC: originator mac */ | |
363 | primary_if->net_dev->dev_addr, | |
99e966fc | 364 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 365 | * with XX = claim type |
38ef3d1d | 366 | * and YY:YY = group id |
23721387 | 367 | */ |
6b5e971a | 368 | (u8 *)&local_claim_dest); |
23721387 SW |
369 | |
370 | if (!skb) | |
371 | goto out; | |
372 | ||
373 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 374 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
375 | |
376 | /* now we pretend that the client would have sent this ... */ | |
377 | switch (claimtype) { | |
3eb8773e | 378 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
379 | /* normal claim frame |
380 | * set Ethernet SRC to the clients mac | |
381 | */ | |
8fdd0153 | 382 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 383 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 384 | "%s(): CLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 385 | batadv_print_vid(vid)); |
23721387 | 386 | break; |
3eb8773e | 387 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
388 | /* unclaim frame |
389 | * set HW SRC to the clients mac | |
390 | */ | |
8fdd0153 | 391 | ether_addr_copy(hw_src, mac); |
39c75a51 | 392 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 393 | "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
f7a2bd65 | 394 | batadv_print_vid(vid)); |
23721387 | 395 | break; |
acd34afa | 396 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 | 397 | /* announcement frame |
791ad7f5 | 398 | * set HW SRC to the special mac containing the crc |
23721387 | 399 | */ |
8fdd0153 | 400 | ether_addr_copy(hw_src, mac); |
39c75a51 | 401 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 402 | "%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
f7a2bd65 | 403 | ethhdr->h_source, batadv_print_vid(vid)); |
23721387 | 404 | break; |
acd34afa | 405 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 406 | /* request frame |
99e966fc SW |
407 | * set HW SRC and header destination to the receiving backbone |
408 | * gws mac | |
23721387 | 409 | */ |
8fdd0153 AQ |
410 | ether_addr_copy(hw_src, mac); |
411 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 412 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 413 | "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
5f80df67 | 414 | ethhdr->h_source, ethhdr->h_dest, |
f7a2bd65 | 415 | batadv_print_vid(vid)); |
23721387 | 416 | break; |
cd9c7bfb SW |
417 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
418 | ether_addr_copy(ethhdr->h_source, mac); | |
419 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
420 | "%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
421 | __func__, ethhdr->h_source, ethhdr->h_dest, | |
f7a2bd65 | 422 | batadv_print_vid(vid)); |
cd9c7bfb SW |
423 | |
424 | break; | |
23721387 SW |
425 | } |
426 | ||
10c78f58 | 427 | if (vid & BATADV_VLAN_HAS_TAG) { |
eb2deb6b AQ |
428 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
429 | vid & VLAN_VID_MASK); | |
10c78f58 SE |
430 | if (!skb) |
431 | goto out; | |
432 | } | |
23721387 SW |
433 | |
434 | skb_reset_mac_header(skb); | |
435 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
436 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
437 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
438 | skb->len + ETH_HLEN); | |
23721387 | 439 | |
b1de0f01 | 440 | netif_rx_any_context(skb); |
23721387 SW |
441 | out: |
442 | if (primary_if) | |
82047ad7 | 443 | batadv_hardif_put(primary_if); |
23721387 SW |
444 | } |
445 | ||
cd9c7bfb | 446 | /** |
7e9a8c2c | 447 | * batadv_bla_loopdetect_report() - worker for reporting the loop |
cd9c7bfb SW |
448 | * @work: work queue item |
449 | * | |
450 | * Throws an uevent, as the loopdetect check function can't do that itself | |
451 | * since the kernel may sleep while throwing uevents. | |
452 | */ | |
453 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
454 | { | |
455 | struct batadv_bla_backbone_gw *backbone_gw; | |
456 | struct batadv_priv *bat_priv; | |
457 | char vid_str[6] = { '\0' }; | |
458 | ||
459 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
460 | report_work); | |
461 | bat_priv = backbone_gw->bat_priv; | |
462 | ||
463 | batadv_info(bat_priv->soft_iface, | |
464 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
f7a2bd65 | 465 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb | 466 | snprintf(vid_str, sizeof(vid_str), "%d", |
f7a2bd65 | 467 | batadv_print_vid(backbone_gw->vid)); |
cd9c7bfb SW |
468 | vid_str[sizeof(vid_str) - 1] = 0; |
469 | ||
470 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
471 | vid_str); | |
472 | ||
473 | batadv_backbone_gw_put(backbone_gw); | |
474 | } | |
475 | ||
2c53040f | 476 | /** |
7e9a8c2c | 477 | * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
2c53040f | 478 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
479 | * @orig: the mac address of the originator |
480 | * @vid: the VLAN ID | |
e3357189 | 481 | * @own_backbone: set if the requested backbone is local |
23721387 | 482 | * |
04e14be6 | 483 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 484 | */ |
bae98774 | 485 | static struct batadv_bla_backbone_gw * |
6b5e971a | 486 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 487 | unsigned short vid, bool own_backbone) |
23721387 | 488 | { |
bae98774 | 489 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 490 | struct batadv_orig_node *orig_node; |
23721387 SW |
491 | int hash_added; |
492 | ||
3b300de3 | 493 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
494 | |
495 | if (entry) | |
496 | return entry; | |
497 | ||
39c75a51 | 498 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 499 | "%s(): not found (%pM, %d), creating new entry\n", __func__, |
f7a2bd65 | 500 | orig, batadv_print_vid(vid)); |
23721387 SW |
501 | |
502 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
503 | if (!entry) | |
504 | return NULL; | |
505 | ||
506 | entry->vid = vid; | |
507 | entry->lasttime = jiffies; | |
3964f728 | 508 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 509 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 510 | spin_lock_init(&entry->crc_lock); |
23721387 | 511 | atomic_set(&entry->request_sent, 0); |
28709878 | 512 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 513 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 514 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
06e56ded | 515 | kref_init(&entry->refcount); |
23721387 | 516 | |
4e8389e1 | 517 | kref_get(&entry->refcount); |
807736f6 | 518 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
519 | batadv_compare_backbone_gw, |
520 | batadv_choose_backbone_gw, entry, | |
521 | &entry->hash_entry); | |
23721387 SW |
522 | |
523 | if (unlikely(hash_added != 0)) { | |
524 | /* hash failed, free the structure */ | |
525 | kfree(entry); | |
526 | return NULL; | |
527 | } | |
528 | ||
95fb130d | 529 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 530 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 531 | if (orig_node) { |
95fb130d | 532 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 533 | "became a backbone gateway"); |
5d967310 | 534 | batadv_orig_node_put(orig_node); |
20ff9d59 | 535 | } |
52aebd6a | 536 | |
d807f272 | 537 | if (own_backbone) { |
52aebd6a SW |
538 | batadv_bla_send_announce(bat_priv, entry); |
539 | ||
d807f272 SW |
540 | /* this will be decreased in the worker thread */ |
541 | atomic_inc(&entry->request_sent); | |
28709878 | 542 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
543 | atomic_inc(&bat_priv->bla.num_requests); |
544 | } | |
545 | ||
23721387 SW |
546 | return entry; |
547 | } | |
548 | ||
04e14be6 | 549 | /** |
7e9a8c2c | 550 | * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN |
04e14be6 SW |
551 | * @bat_priv: the bat priv with all the soft interface information |
552 | * @primary_if: the selected primary interface | |
553 | * @vid: VLAN identifier | |
554 | * | |
555 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
556 | * where we receive other backbone gws |
557 | */ | |
56303d34 SE |
558 | static void |
559 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
560 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 561 | unsigned short vid) |
23721387 | 562 | { |
bae98774 | 563 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 564 | |
3b300de3 SE |
565 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
566 | primary_if->net_dev->dev_addr, | |
52aebd6a | 567 | vid, true); |
23721387 SW |
568 | if (unlikely(!backbone_gw)) |
569 | return; | |
570 | ||
571 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 572 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
573 | } |
574 | ||
1b371d13 | 575 | /** |
7e9a8c2c | 576 | * batadv_bla_answer_request() - answer a bla request by sending own claims |
1b371d13 | 577 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 578 | * @primary_if: interface where the request came on |
23721387 SW |
579 | * @vid: the vid where the request came on |
580 | * | |
581 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
582 | * to allow the requester another check if the CRC is correct now. | |
583 | */ | |
56303d34 SE |
584 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
585 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 586 | unsigned short vid) |
23721387 | 587 | { |
23721387 | 588 | struct hlist_head *head; |
5bf74e9c | 589 | struct batadv_hashtable *hash; |
712bbfe4 | 590 | struct batadv_bla_claim *claim; |
bae98774 | 591 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
592 | int i; |
593 | ||
39c75a51 | 594 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
595 | "%s(): received a claim request, send all of our own claims again\n", |
596 | __func__); | |
23721387 | 597 | |
3b300de3 SE |
598 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
599 | primary_if->net_dev->dev_addr, | |
600 | vid); | |
23721387 SW |
601 | if (!backbone_gw) |
602 | return; | |
603 | ||
807736f6 | 604 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
605 | for (i = 0; i < hash->size; i++) { |
606 | head = &hash->table[i]; | |
607 | ||
608 | rcu_read_lock(); | |
b67bfe0d | 609 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
610 | /* only own claims are interesting */ |
611 | if (claim->backbone_gw != backbone_gw) | |
612 | continue; | |
613 | ||
3b300de3 | 614 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 615 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
616 | } |
617 | rcu_read_unlock(); | |
618 | } | |
619 | ||
620 | /* finally, send an announcement frame */ | |
3b300de3 | 621 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 622 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
623 | } |
624 | ||
1b371d13 | 625 | /** |
7e9a8c2c | 626 | * batadv_bla_send_request() - send a request to repeat claims |
1b371d13 | 627 | * @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
628 | * |
629 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
630 | * After the request, it will repeat all of his own claims and finally | |
631 | * send an announcement claim with which we can check again. | |
632 | */ | |
bae98774 | 633 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
634 | { |
635 | /* first, remove all old entries */ | |
3b300de3 | 636 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 637 | |
39c75a51 SE |
638 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
639 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
640 | |
641 | /* send request */ | |
3b300de3 | 642 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 643 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
644 | |
645 | /* no local broadcasts should be sent or received, for now. */ | |
646 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 647 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
648 | atomic_set(&backbone_gw->request_sent, 1); |
649 | } | |
650 | } | |
651 | ||
1b371d13 | 652 | /** |
7e9a8c2c | 653 | * batadv_bla_send_announce() - Send an announcement frame |
1b371d13 | 654 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 655 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 656 | */ |
56303d34 | 657 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 658 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 659 | { |
6b5e971a | 660 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 661 | __be16 crc; |
23721387 | 662 | |
3b300de3 | 663 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 664 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 665 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 666 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 667 | memcpy(&mac[4], &crc, 2); |
23721387 | 668 | |
3b300de3 | 669 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 670 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
671 | } |
672 | ||
2c53040f | 673 | /** |
7e9a8c2c | 674 | * batadv_bla_add_claim() - Adds a claim in the claim hash |
2c53040f | 675 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
676 | * @mac: the mac address of the claim |
677 | * @vid: the VLAN ID of the frame | |
678 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 679 | */ |
56303d34 | 680 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 681 | const u8 *mac, const unsigned short vid, |
bae98774 | 682 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 683 | { |
3db0decf | 684 | struct batadv_bla_backbone_gw *old_backbone_gw; |
712bbfe4 ML |
685 | struct batadv_bla_claim *claim; |
686 | struct batadv_bla_claim search_claim; | |
3db0decf | 687 | bool remove_crc = false; |
23721387 SW |
688 | int hash_added; |
689 | ||
8fdd0153 | 690 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 691 | search_claim.vid = vid; |
3b300de3 | 692 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
693 | |
694 | /* create a new claim entry if it does not exist yet. */ | |
695 | if (!claim) { | |
696 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
697 | if (!claim) | |
698 | return; | |
699 | ||
8fdd0153 | 700 | ether_addr_copy(claim->addr, mac); |
3db0decf | 701 | spin_lock_init(&claim->backbone_lock); |
23721387 SW |
702 | claim->vid = vid; |
703 | claim->lasttime = jiffies; | |
3db0decf | 704 | kref_get(&backbone_gw->refcount); |
23721387 | 705 | claim->backbone_gw = backbone_gw; |
71b7e3d3 | 706 | kref_init(&claim->refcount); |
7282ac39 | 707 | |
39c75a51 | 708 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
709 | "%s(): adding new entry %pM, vid %d to hash ...\n", |
710 | __func__, mac, batadv_print_vid(vid)); | |
7282ac39 SE |
711 | |
712 | kref_get(&claim->refcount); | |
807736f6 | 713 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
714 | batadv_compare_claim, |
715 | batadv_choose_claim, claim, | |
716 | &claim->hash_entry); | |
23721387 SW |
717 | |
718 | if (unlikely(hash_added != 0)) { | |
719 | /* only local changes happened. */ | |
720 | kfree(claim); | |
721 | return; | |
722 | } | |
723 | } else { | |
724 | claim->lasttime = jiffies; | |
725 | if (claim->backbone_gw == backbone_gw) | |
726 | /* no need to register a new backbone */ | |
727 | goto claim_free_ref; | |
728 | ||
39c75a51 | 729 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
730 | "%s(): changing ownership for %pM, vid %d to gw %pM\n", |
731 | __func__, mac, batadv_print_vid(vid), | |
732 | backbone_gw->orig); | |
23721387 | 733 | |
3db0decf | 734 | remove_crc = true; |
23721387 | 735 | } |
3db0decf SE |
736 | |
737 | /* replace backbone_gw atomically and adjust reference counters */ | |
738 | spin_lock_bh(&claim->backbone_lock); | |
739 | old_backbone_gw = claim->backbone_gw; | |
06e56ded | 740 | kref_get(&backbone_gw->refcount); |
23721387 | 741 | claim->backbone_gw = backbone_gw; |
3db0decf | 742 | spin_unlock_bh(&claim->backbone_lock); |
23721387 | 743 | |
3db0decf SE |
744 | if (remove_crc) { |
745 | /* remove claim address from old backbone_gw */ | |
746 | spin_lock_bh(&old_backbone_gw->crc_lock); | |
747 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
748 | spin_unlock_bh(&old_backbone_gw->crc_lock); | |
749 | } | |
23721387 | 750 | |
3db0decf SE |
751 | batadv_backbone_gw_put(old_backbone_gw); |
752 | ||
753 | /* add claim address to new backbone_gw */ | |
5a1dd8a4 | 754 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 755 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 756 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
757 | backbone_gw->lasttime = jiffies; |
758 | ||
759 | claim_free_ref: | |
321e3e08 | 760 | batadv_claim_put(claim); |
23721387 SW |
761 | } |
762 | ||
3db0decf | 763 | /** |
7e9a8c2c | 764 | * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of |
3db0decf SE |
765 | * claim |
766 | * @claim: claim whose backbone_gw should be returned | |
767 | * | |
768 | * Return: valid reference to claim::backbone_gw | |
769 | */ | |
770 | static struct batadv_bla_backbone_gw * | |
771 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) | |
772 | { | |
773 | struct batadv_bla_backbone_gw *backbone_gw; | |
774 | ||
775 | spin_lock_bh(&claim->backbone_lock); | |
776 | backbone_gw = claim->backbone_gw; | |
777 | kref_get(&backbone_gw->refcount); | |
778 | spin_unlock_bh(&claim->backbone_lock); | |
779 | ||
780 | return backbone_gw; | |
781 | } | |
782 | ||
04e14be6 | 783 | /** |
7e9a8c2c | 784 | * batadv_bla_del_claim() - delete a claim from the claim hash |
04e14be6 SW |
785 | * @bat_priv: the bat priv with all the soft interface information |
786 | * @mac: mac address of the claim to be removed | |
787 | * @vid: VLAN id for the claim to be removed | |
23721387 | 788 | */ |
56303d34 | 789 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 790 | const u8 *mac, const unsigned short vid) |
23721387 | 791 | { |
712bbfe4 | 792 | struct batadv_bla_claim search_claim, *claim; |
4ba104f4 SE |
793 | struct batadv_bla_claim *claim_removed_entry; |
794 | struct hlist_node *claim_removed_node; | |
23721387 | 795 | |
8fdd0153 | 796 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 797 | search_claim.vid = vid; |
3b300de3 | 798 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
799 | if (!claim) |
800 | return; | |
801 | ||
22f0502e | 802 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, |
f7a2bd65 | 803 | mac, batadv_print_vid(vid)); |
23721387 | 804 | |
4ba104f4 SE |
805 | claim_removed_node = batadv_hash_remove(bat_priv->bla.claim_hash, |
806 | batadv_compare_claim, | |
807 | batadv_choose_claim, claim); | |
808 | if (!claim_removed_node) | |
809 | goto free_claim; | |
23721387 | 810 | |
4ba104f4 SE |
811 | /* reference from the hash is gone */ |
812 | claim_removed_entry = hlist_entry(claim_removed_node, | |
813 | struct batadv_bla_claim, hash_entry); | |
814 | batadv_claim_put(claim_removed_entry); | |
815 | ||
816 | free_claim: | |
23721387 | 817 | /* don't need the reference from hash_find() anymore */ |
321e3e08 | 818 | batadv_claim_put(claim); |
23721387 SW |
819 | } |
820 | ||
62fe710f | 821 | /** |
7e9a8c2c | 822 | * batadv_handle_announce() - check for ANNOUNCE frame |
04e14be6 SW |
823 | * @bat_priv: the bat priv with all the soft interface information |
824 | * @an_addr: announcement mac address (ARP Sender HW address) | |
825 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
826 | * @vid: the VLAN ID of the frame | |
62fe710f | 827 | * |
4b426b10 | 828 | * Return: true if handled |
62fe710f | 829 | */ |
4b426b10 SE |
830 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
831 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 832 | { |
bae98774 | 833 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 834 | u16 backbone_crc, crc; |
23721387 | 835 | |
3b300de3 | 836 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 837 | return false; |
23721387 | 838 | |
52aebd6a SW |
839 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
840 | false); | |
23721387 SW |
841 | |
842 | if (unlikely(!backbone_gw)) | |
4b426b10 | 843 | return true; |
23721387 | 844 | |
23721387 SW |
845 | /* handle as ANNOUNCE frame */ |
846 | backbone_gw->lasttime = jiffies; | |
61a29286 | 847 | crc = ntohs(*((__force __be16 *)(&an_addr[4]))); |
23721387 | 848 | |
39c75a51 | 849 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
850 | "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
851 | __func__, batadv_print_vid(vid), backbone_gw->orig, crc); | |
23721387 | 852 | |
5a1dd8a4 SW |
853 | spin_lock_bh(&backbone_gw->crc_lock); |
854 | backbone_crc = backbone_gw->crc; | |
855 | spin_unlock_bh(&backbone_gw->crc_lock); | |
856 | ||
857 | if (backbone_crc != crc) { | |
39c75a51 | 858 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
859 | "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
860 | __func__, backbone_gw->orig, | |
f7a2bd65 | 861 | batadv_print_vid(backbone_gw->vid), |
5a1dd8a4 | 862 | backbone_crc, crc); |
23721387 | 863 | |
3b300de3 | 864 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
865 | } else { |
866 | /* if we have sent a request and the crc was OK, | |
867 | * we can allow traffic again. | |
868 | */ | |
869 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 870 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
871 | atomic_set(&backbone_gw->request_sent, 0); |
872 | } | |
873 | } | |
874 | ||
c8b86c12 | 875 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 876 | return true; |
23721387 SW |
877 | } |
878 | ||
62fe710f | 879 | /** |
7e9a8c2c | 880 | * batadv_handle_request() - check for REQUEST frame |
04e14be6 SW |
881 | * @bat_priv: the bat priv with all the soft interface information |
882 | * @primary_if: the primary hard interface of this batman soft interface | |
883 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
884 | * @ethhdr: ethernet header of a packet | |
885 | * @vid: the VLAN ID of the frame | |
62fe710f | 886 | * |
4b426b10 | 887 | * Return: true if handled |
62fe710f | 888 | */ |
4b426b10 SE |
889 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
890 | struct batadv_hard_iface *primary_if, | |
891 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
892 | unsigned short vid) | |
23721387 SW |
893 | { |
894 | /* check for REQUEST frame */ | |
1eda58bf | 895 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 896 | return false; |
23721387 SW |
897 | |
898 | /* sanity check, this should not happen on a normal switch, | |
899 | * we ignore it in this case. | |
900 | */ | |
1eda58bf | 901 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 902 | return true; |
23721387 | 903 | |
39c75a51 | 904 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
905 | "%s(): REQUEST vid %d (sent by %pM)...\n", |
906 | __func__, batadv_print_vid(vid), ethhdr->h_source); | |
23721387 | 907 | |
3b300de3 | 908 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 909 | return true; |
23721387 SW |
910 | } |
911 | ||
62fe710f | 912 | /** |
7e9a8c2c | 913 | * batadv_handle_unclaim() - check for UNCLAIM frame |
04e14be6 SW |
914 | * @bat_priv: the bat priv with all the soft interface information |
915 | * @primary_if: the primary hard interface of this batman soft interface | |
916 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
917 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
918 | * @vid: the VLAN ID of the frame | |
62fe710f | 919 | * |
4b426b10 | 920 | * Return: true if handled |
62fe710f | 921 | */ |
4b426b10 SE |
922 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
923 | struct batadv_hard_iface *primary_if, | |
924 | u8 *backbone_addr, u8 *claim_addr, | |
925 | unsigned short vid) | |
23721387 | 926 | { |
bae98774 | 927 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
928 | |
929 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
930 | if (primary_if && batadv_compare_eth(backbone_addr, |
931 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 932 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 933 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 934 | |
3b300de3 | 935 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
936 | |
937 | if (!backbone_gw) | |
4b426b10 | 938 | return true; |
23721387 SW |
939 | |
940 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 941 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 942 | "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, |
f7a2bd65 | 943 | claim_addr, batadv_print_vid(vid), backbone_gw->orig); |
23721387 | 944 | |
3b300de3 | 945 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 946 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 947 | return true; |
23721387 SW |
948 | } |
949 | ||
62fe710f | 950 | /** |
7e9a8c2c | 951 | * batadv_handle_claim() - check for CLAIM frame |
04e14be6 SW |
952 | * @bat_priv: the bat priv with all the soft interface information |
953 | * @primary_if: the primary hard interface of this batman soft interface | |
954 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
955 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
956 | * @vid: the VLAN ID of the frame | |
62fe710f | 957 | * |
4b426b10 | 958 | * Return: true if handled |
62fe710f | 959 | */ |
4b426b10 SE |
960 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
961 | struct batadv_hard_iface *primary_if, | |
962 | u8 *backbone_addr, u8 *claim_addr, | |
963 | unsigned short vid) | |
23721387 | 964 | { |
bae98774 | 965 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
966 | |
967 | /* register the gateway if not yet available, and add the claim. */ | |
968 | ||
52aebd6a SW |
969 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
970 | false); | |
23721387 SW |
971 | |
972 | if (unlikely(!backbone_gw)) | |
4b426b10 | 973 | return true; |
23721387 SW |
974 | |
975 | /* this must be a CLAIM frame */ | |
3b300de3 | 976 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 977 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 978 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 979 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
980 | |
981 | /* TODO: we could call something like tt_local_del() here. */ | |
982 | ||
c8b86c12 | 983 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 984 | return true; |
23721387 SW |
985 | } |
986 | ||
2c53040f | 987 | /** |
7e9a8c2c | 988 | * batadv_check_claim_group() - check for claim group membership |
2c53040f | 989 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 990 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
991 | * @hw_src: the Hardware source in the ARP Header |
992 | * @hw_dst: the Hardware destination in the ARP Header | |
993 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
994 | * | |
bccb48c8 | 995 | * checks if it is a claim packet and if it's on the same group. |
38ef3d1d SW |
996 | * This function also applies the group ID of the sender |
997 | * if it is in the same mesh. | |
998 | * | |
62fe710f | 999 | * Return: |
38ef3d1d SW |
1000 | * 2 - if it is a claim packet and on the same group |
1001 | * 1 - if is a claim packet from another group | |
1002 | * 0 - if it is not a claim packet | |
1003 | */ | |
56303d34 SE |
1004 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
1005 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 1006 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 1007 | struct ethhdr *ethhdr) |
38ef3d1d | 1008 | { |
6b5e971a | 1009 | u8 *backbone_addr; |
56303d34 | 1010 | struct batadv_orig_node *orig_node; |
96412690 | 1011 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 1012 | |
96412690 | 1013 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 1014 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 1015 | |
38ef3d1d SW |
1016 | /* if announcement packet, use the source, |
1017 | * otherwise assume it is in the hw_src | |
1018 | */ | |
1019 | switch (bla_dst->type) { | |
3eb8773e | 1020 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
1021 | backbone_addr = hw_src; |
1022 | break; | |
acd34afa SE |
1023 | case BATADV_CLAIM_TYPE_REQUEST: |
1024 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 1025 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
1026 | backbone_addr = ethhdr->h_source; |
1027 | break; | |
1028 | default: | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 1033 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
1034 | return 0; |
1035 | ||
1036 | /* if its already the same group, it is fine. */ | |
1037 | if (bla_dst->group == bla_dst_own->group) | |
1038 | return 2; | |
1039 | ||
1040 | /* lets see if this originator is in our mesh */ | |
da641193 | 1041 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d | 1042 | |
791ad7f5 | 1043 | /* don't accept claims from gateways which are not in |
38ef3d1d SW |
1044 | * the same mesh or group. |
1045 | */ | |
1046 | if (!orig_node) | |
1047 | return 1; | |
1048 | ||
1049 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1050 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1051 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1052 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1053 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1054 | bla_dst_own->group = bla_dst->group; |
1055 | } | |
1056 | ||
5d967310 | 1057 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1058 | |
1059 | return 2; | |
1060 | } | |
1061 | ||
1b371d13 | 1062 | /** |
7e9a8c2c | 1063 | * batadv_bla_process_claim() - Check if this is a claim frame, and process it |
1b371d13 | 1064 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1065 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1066 | * @skb: the frame to be checked |
1067 | * | |
4b426b10 | 1068 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1069 | * tell the callee that it can use the frame on its own. |
1070 | */ | |
4b426b10 SE |
1071 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1072 | struct batadv_hard_iface *primary_if, | |
1073 | struct sk_buff *skb) | |
23721387 | 1074 | { |
d46b6bfa | 1075 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1076 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1077 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1078 | struct ethhdr *ethhdr; |
23721387 | 1079 | struct arphdr *arphdr; |
c018ad3d | 1080 | unsigned short vid; |
d46b6bfa | 1081 | int vlan_depth = 0; |
293e9338 | 1082 | __be16 proto; |
23721387 | 1083 | int headlen; |
38ef3d1d | 1084 | int ret; |
23721387 | 1085 | |
c018ad3d | 1086 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1087 | ethhdr = eth_hdr(skb); |
23721387 | 1088 | |
c018ad3d AQ |
1089 | proto = ethhdr->h_proto; |
1090 | headlen = ETH_HLEN; | |
1091 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1092 | /* Traverse the VLAN/Ethertypes. |
1093 | * | |
1094 | * At this point it is known that the first protocol is a VLAN | |
1095 | * header, so start checking at the encapsulated protocol. | |
1096 | * | |
1097 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1098 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1099 | */ | |
1100 | do { | |
1101 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1102 | &vhdr_buf); | |
1103 | if (!vhdr) | |
4b426b10 | 1104 | return false; |
d46b6bfa SW |
1105 | |
1106 | proto = vhdr->h_vlan_encapsulated_proto; | |
1107 | headlen += VLAN_HLEN; | |
1108 | vlan_depth++; | |
1109 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1110 | } |
1111 | ||
293e9338 | 1112 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1113 | return false; /* not a claim frame */ |
23721387 SW |
1114 | |
1115 | /* this must be a ARP frame. check if it is a claim. */ | |
1116 | ||
1117 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1118 | return false; |
23721387 SW |
1119 | |
1120 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1121 | ethhdr = eth_hdr(skb); |
6b5e971a | 1122 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1123 | |
1124 | /* Check whether the ARP frame carries a valid | |
1125 | * IP information | |
1126 | */ | |
23721387 | 1127 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1128 | return false; |
23721387 | 1129 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1130 | return false; |
23721387 | 1131 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1132 | return false; |
23721387 | 1133 | if (arphdr->ar_pln != 4) |
4b426b10 | 1134 | return false; |
23721387 | 1135 | |
6b5e971a | 1136 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1137 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1138 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1139 | bla_dst_own = &bat_priv->bla.claim_dest; |
1140 | ||
1141 | /* check if it is a claim frame in general */ | |
1142 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1143 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1144 | return false; |
d46b6bfa SW |
1145 | |
1146 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1147 | * drop that, as this is not supported by BLA but should also not be | |
1148 | * sent via the mesh. | |
1149 | */ | |
1150 | if (vlan_depth > 1) | |
4b426b10 | 1151 | return true; |
23721387 | 1152 | |
cd9c7bfb SW |
1153 | /* Let the loopdetect frames on the mesh in any case. */ |
1154 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
4fd261bf | 1155 | return false; |
cd9c7bfb | 1156 | |
23721387 | 1157 | /* check if it is a claim frame. */ |
3b300de3 SE |
1158 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1159 | ethhdr); | |
38ef3d1d | 1160 | if (ret == 1) |
39c75a51 | 1161 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1162 | "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1163 | __func__, ethhdr->h_source, batadv_print_vid(vid), | |
1164 | hw_src, hw_dst); | |
38ef3d1d SW |
1165 | |
1166 | if (ret < 2) | |
4b426b10 | 1167 | return !!ret; |
23721387 SW |
1168 | |
1169 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1170 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1171 | |
1172 | /* check for the different types of claim frames ... */ | |
1173 | switch (bla_dst->type) { | |
3eb8773e | 1174 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1175 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1176 | ethhdr->h_source, vid)) | |
4b426b10 | 1177 | return true; |
23721387 | 1178 | break; |
3eb8773e | 1179 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1180 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1181 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1182 | return true; |
23721387 SW |
1183 | break; |
1184 | ||
acd34afa | 1185 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1186 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1187 | vid)) | |
4b426b10 | 1188 | return true; |
23721387 | 1189 | break; |
acd34afa | 1190 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1191 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1192 | vid)) | |
4b426b10 | 1193 | return true; |
23721387 SW |
1194 | break; |
1195 | } | |
1196 | ||
39c75a51 | 1197 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e SE |
1198 | "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
1199 | __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, | |
1200 | hw_dst); | |
4b426b10 | 1201 | return true; |
23721387 SW |
1202 | } |
1203 | ||
04e14be6 | 1204 | /** |
7e9a8c2c | 1205 | * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or |
04e14be6 SW |
1206 | * immediately |
1207 | * @bat_priv: the bat priv with all the soft interface information | |
1208 | * @now: whether the whole hash shall be wiped now | |
1209 | * | |
1210 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1211 | * a time out, or clean all backbone gws if now is set. |
1212 | */ | |
56303d34 | 1213 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1214 | { |
bae98774 | 1215 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1216 | struct hlist_node *node_tmp; |
23721387 | 1217 | struct hlist_head *head; |
5bf74e9c | 1218 | struct batadv_hashtable *hash; |
23721387 SW |
1219 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1220 | int i; | |
1221 | ||
807736f6 | 1222 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1223 | if (!hash) |
1224 | return; | |
1225 | ||
1226 | for (i = 0; i < hash->size; i++) { | |
1227 | head = &hash->table[i]; | |
1228 | list_lock = &hash->list_locks[i]; | |
1229 | ||
1230 | spin_lock_bh(list_lock); | |
b67bfe0d | 1231 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1232 | head, hash_entry) { |
1233 | if (now) | |
1234 | goto purge_now; | |
1eda58bf | 1235 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1236 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1237 | continue; |
1238 | ||
39c75a51 | 1239 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
22f0502e SE |
1240 | "%s(): backbone gw %pM timed out\n", |
1241 | __func__, backbone_gw->orig); | |
23721387 SW |
1242 | |
1243 | purge_now: | |
1244 | /* don't wait for the pending request anymore */ | |
1245 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1246 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1247 | |
3b300de3 | 1248 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1249 | |
b67bfe0d | 1250 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1251 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1252 | } |
1253 | spin_unlock_bh(list_lock); | |
1254 | } | |
1255 | } | |
1256 | ||
2c53040f | 1257 | /** |
7e9a8c2c | 1258 | * batadv_bla_purge_claims() - Remove claims after a timeout or immediately |
2c53040f | 1259 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1260 | * @primary_if: the selected primary interface, may be NULL if now is set |
1261 | * @now: whether the whole hash shall be wiped now | |
1262 | * | |
1263 | * Check when we heard last time from our own claims, and remove them in case of | |
1264 | * a time out, or clean all claims if now is set | |
1265 | */ | |
56303d34 SE |
1266 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1267 | struct batadv_hard_iface *primary_if, | |
1268 | int now) | |
23721387 | 1269 | { |
3db0decf | 1270 | struct batadv_bla_backbone_gw *backbone_gw; |
712bbfe4 | 1271 | struct batadv_bla_claim *claim; |
23721387 | 1272 | struct hlist_head *head; |
5bf74e9c | 1273 | struct batadv_hashtable *hash; |
23721387 SW |
1274 | int i; |
1275 | ||
807736f6 | 1276 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1277 | if (!hash) |
1278 | return; | |
1279 | ||
1280 | for (i = 0; i < hash->size; i++) { | |
1281 | head = &hash->table[i]; | |
1282 | ||
1283 | rcu_read_lock(); | |
b67bfe0d | 1284 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3db0decf | 1285 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
23721387 SW |
1286 | if (now) |
1287 | goto purge_now; | |
3db0decf SE |
1288 | |
1289 | if (!batadv_compare_eth(backbone_gw->orig, | |
1eda58bf | 1290 | primary_if->net_dev->dev_addr)) |
3db0decf SE |
1291 | goto skip; |
1292 | ||
1eda58bf | 1293 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1294 | BATADV_BLA_CLAIM_TIMEOUT)) |
3db0decf | 1295 | goto skip; |
23721387 | 1296 | |
39c75a51 | 1297 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1298 | "%s(): timed out.\n", __func__); |
23721387 SW |
1299 | |
1300 | purge_now: | |
4dd72f73 | 1301 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
22f0502e | 1302 | "%s(): %pM, vid %d\n", __func__, |
4dd72f73 AP |
1303 | claim->addr, claim->vid); |
1304 | ||
3b300de3 | 1305 | batadv_handle_unclaim(bat_priv, primary_if, |
3db0decf | 1306 | backbone_gw->orig, |
3b300de3 | 1307 | claim->addr, claim->vid); |
3db0decf SE |
1308 | skip: |
1309 | batadv_backbone_gw_put(backbone_gw); | |
23721387 SW |
1310 | } |
1311 | rcu_read_unlock(); | |
1312 | } | |
1313 | } | |
1314 | ||
2c53040f | 1315 | /** |
7e9a8c2c | 1316 | * batadv_bla_update_orig_address() - Update the backbone gateways when the own |
04e14be6 | 1317 | * originator address changes |
2c53040f | 1318 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1319 | * @primary_if: the new selected primary_if |
1320 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1321 | */ |
56303d34 SE |
1322 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1323 | struct batadv_hard_iface *primary_if, | |
1324 | struct batadv_hard_iface *oldif) | |
23721387 | 1325 | { |
bae98774 | 1326 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1327 | struct hlist_head *head; |
5bf74e9c | 1328 | struct batadv_hashtable *hash; |
807736f6 | 1329 | __be16 group; |
23721387 SW |
1330 | int i; |
1331 | ||
38ef3d1d | 1332 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1333 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1334 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1335 | |
d5b4c93e SW |
1336 | /* purge everything when bridge loop avoidance is turned off */ |
1337 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1338 | oldif = NULL; | |
1339 | ||
23721387 | 1340 | if (!oldif) { |
3b300de3 SE |
1341 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1342 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1343 | return; |
1344 | } | |
1345 | ||
807736f6 | 1346 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1347 | if (!hash) |
1348 | return; | |
1349 | ||
1350 | for (i = 0; i < hash->size; i++) { | |
1351 | head = &hash->table[i]; | |
1352 | ||
1353 | rcu_read_lock(); | |
b67bfe0d | 1354 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1355 | /* own orig still holds the old value. */ |
1eda58bf SE |
1356 | if (!batadv_compare_eth(backbone_gw->orig, |
1357 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1358 | continue; |
1359 | ||
8fdd0153 AQ |
1360 | ether_addr_copy(backbone_gw->orig, |
1361 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1362 | /* send an announce frame so others will ask for our |
1363 | * claims and update their tables. | |
1364 | */ | |
3b300de3 | 1365 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1366 | } |
1367 | rcu_read_unlock(); | |
1368 | } | |
1369 | } | |
1370 | ||
cd9c7bfb | 1371 | /** |
7e9a8c2c | 1372 | * batadv_bla_send_loopdetect() - send a loopdetect frame |
cd9c7bfb SW |
1373 | * @bat_priv: the bat priv with all the soft interface information |
1374 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1375 | * | |
1376 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1377 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1378 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1379 | * indicates that there is a loop. | |
1380 | */ | |
1381 | static void | |
1382 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1383 | struct batadv_bla_backbone_gw *backbone_gw) | |
1384 | { | |
1385 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1386 | backbone_gw->vid); | |
1387 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1388 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1389 | } | |
1390 | ||
d68081a2 | 1391 | /** |
7e9a8c2c | 1392 | * batadv_bla_status_update() - purge bla interfaces if necessary |
d68081a2 SW |
1393 | * @net_dev: the soft interface net device |
1394 | */ | |
1395 | void batadv_bla_status_update(struct net_device *net_dev) | |
1396 | { | |
1397 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1398 | struct batadv_hard_iface *primary_if; | |
1399 | ||
1400 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1401 | if (!primary_if) | |
1402 | return; | |
1403 | ||
1404 | /* this function already purges everything when bla is disabled, | |
1405 | * so just call that one. | |
1406 | */ | |
1407 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1408 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1409 | } |
1410 | ||
04e14be6 | 1411 | /** |
7e9a8c2c | 1412 | * batadv_bla_periodic_work() - performs periodic bla work |
04e14be6 SW |
1413 | * @work: kernel work struct |
1414 | * | |
1415 | * periodic work to do: | |
23721387 SW |
1416 | * * purge structures when they are too old |
1417 | * * send announcements | |
1418 | */ | |
3b300de3 | 1419 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1420 | { |
bbb1f90e | 1421 | struct delayed_work *delayed_work; |
56303d34 | 1422 | struct batadv_priv *bat_priv; |
807736f6 | 1423 | struct batadv_priv_bla *priv_bla; |
23721387 | 1424 | struct hlist_head *head; |
bae98774 | 1425 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1426 | struct batadv_hashtable *hash; |
56303d34 | 1427 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1428 | bool send_loopdetect = false; |
23721387 SW |
1429 | int i; |
1430 | ||
4ba4bc0f | 1431 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1432 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1433 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1434 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1435 | if (!primary_if) |
1436 | goto out; | |
1437 | ||
3b300de3 SE |
1438 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1439 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1440 | |
1441 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1442 | goto out; | |
1443 | ||
cd9c7bfb SW |
1444 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1445 | /* set a new random mac address for the next bridge loop | |
1446 | * detection frames. Set the locally administered bit to avoid | |
1447 | * collisions with users mac addresses. | |
1448 | */ | |
6c1f0a1f | 1449 | eth_random_addr(bat_priv->bla.loopdetect_addr); |
cd9c7bfb SW |
1450 | bat_priv->bla.loopdetect_addr[0] = 0xba; |
1451 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1452 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1453 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1454 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1455 | ||
1456 | /* mark for sending loop detect on all VLANs */ | |
1457 | send_loopdetect = true; | |
1458 | } | |
1459 | ||
807736f6 | 1460 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1461 | if (!hash) |
1462 | goto out; | |
1463 | ||
1464 | for (i = 0; i < hash->size; i++) { | |
1465 | head = &hash->table[i]; | |
1466 | ||
1467 | rcu_read_lock(); | |
b67bfe0d | 1468 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1469 | if (!batadv_compare_eth(backbone_gw->orig, |
1470 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1471 | continue; |
1472 | ||
1473 | backbone_gw->lasttime = jiffies; | |
1474 | ||
3b300de3 | 1475 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1476 | if (send_loopdetect) |
1477 | batadv_bla_send_loopdetect(bat_priv, | |
1478 | backbone_gw); | |
d807f272 SW |
1479 | |
1480 | /* request_sent is only set after creation to avoid | |
1481 | * problems when we are not yet known as backbone gw | |
1482 | * in the backbone. | |
1483 | * | |
28709878 SW |
1484 | * We can reset this now after we waited some periods |
1485 | * to give bridge forward delays and bla group forming | |
1486 | * some grace time. | |
d807f272 SW |
1487 | */ |
1488 | ||
1489 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1490 | continue; | |
1491 | ||
28709878 SW |
1492 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1493 | continue; | |
1494 | ||
d807f272 SW |
1495 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1496 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1497 | } |
1498 | rcu_read_unlock(); | |
1499 | } | |
1500 | out: | |
1501 | if (primary_if) | |
82047ad7 | 1502 | batadv_hardif_put(primary_if); |
23721387 | 1503 | |
72414442 AQ |
1504 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1505 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1506 | } |
1507 | ||
5d52dad2 SE |
1508 | /* The hash for claim and backbone hash receive the same key because they |
1509 | * are getting initialized by hash_new with the same key. Reinitializing | |
1510 | * them with to different keys to allow nested locking without generating | |
1511 | * lockdep warnings | |
1512 | */ | |
3b300de3 SE |
1513 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1514 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1515 | |
04e14be6 | 1516 | /** |
7e9a8c2c | 1517 | * batadv_bla_init() - initialize all bla structures |
04e14be6 SW |
1518 | * @bat_priv: the bat priv with all the soft interface information |
1519 | * | |
1520 | * Return: 0 on success, < 0 on error. | |
1521 | */ | |
56303d34 | 1522 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1523 | { |
fe2da6ff | 1524 | int i; |
6b5e971a | 1525 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1526 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1527 | u16 crc; |
807736f6 | 1528 | unsigned long entrytime; |
fe2da6ff | 1529 | |
7dac7b76 LL |
1530 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1531 | ||
39c75a51 | 1532 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1533 | |
38ef3d1d | 1534 | /* setting claim destination address */ |
807736f6 SE |
1535 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1536 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1537 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1538 | if (primary_if) { |
807736f6 SE |
1539 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1540 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1541 | batadv_hardif_put(primary_if); |
38ef3d1d | 1542 | } else { |
807736f6 | 1543 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1544 | } |
1545 | ||
fe2da6ff | 1546 | /* initialize the duplicate list */ |
807736f6 | 1547 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1548 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1549 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1550 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1551 | |
cd9c7bfb SW |
1552 | atomic_set(&bat_priv->bla.loopdetect_next, |
1553 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1554 | ||
807736f6 | 1555 | if (bat_priv->bla.claim_hash) |
5346c35e | 1556 | return 0; |
23721387 | 1557 | |
807736f6 SE |
1558 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1559 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1560 | |
807736f6 | 1561 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1562 | return -ENOMEM; |
23721387 | 1563 | |
807736f6 | 1564 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1565 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1566 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1567 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1568 | |
39c75a51 | 1569 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1570 | |
72414442 AQ |
1571 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1572 | ||
1573 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1574 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1575 | return 0; |
23721387 SW |
1576 | } |
1577 | ||
2c53040f | 1578 | /** |
2369e827 | 1579 | * batadv_bla_check_duplist() - Check if a frame is in the broadcast dup. |
2c53040f | 1580 | * @bat_priv: the bat priv with all the soft interface information |
2369e827 LL |
1581 | * @skb: contains the multicast packet to be checked |
1582 | * @payload_ptr: pointer to position inside the head buffer of the skb | |
1583 | * marking the start of the data to be CRC'ed | |
1584 | * @orig: originator mac address, NULL if unknown | |
fe2da6ff | 1585 | * |
2369e827 LL |
1586 | * Check if it is on our broadcast list. Another gateway might have sent the |
1587 | * same packet because it is connected to the same backbone, so we have to | |
1588 | * remove this duplicate. | |
fe2da6ff SW |
1589 | * |
1590 | * This is performed by checking the CRC, which will tell us | |
1591 | * with a good chance that it is the same packet. If it is furthermore | |
1592 | * sent by another host, drop it. We allow equal packets from | |
1593 | * the same host however as this might be intended. | |
04e14be6 | 1594 | * |
4b426b10 | 1595 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1596 | */ |
2369e827 LL |
1597 | static bool batadv_bla_check_duplist(struct batadv_priv *bat_priv, |
1598 | struct sk_buff *skb, u8 *payload_ptr, | |
1599 | const u8 *orig) | |
fe2da6ff | 1600 | { |
56303d34 | 1601 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1602 | bool ret = false; |
2369e827 LL |
1603 | int i, curr; |
1604 | __be32 crc; | |
fe2da6ff SW |
1605 | |
1606 | /* calculate the crc ... */ | |
2369e827 | 1607 | crc = batadv_skb_crc32(skb, payload_ptr); |
fe2da6ff | 1608 | |
7dac7b76 LL |
1609 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1610 | ||
42d0b044 | 1611 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1612 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1613 | curr %= BATADV_DUPLIST_SIZE; | |
1614 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1615 | |
1616 | /* we can stop searching if the entry is too old ; | |
1617 | * later entries will be even older | |
1618 | */ | |
42d0b044 SE |
1619 | if (batadv_has_timed_out(entry->entrytime, |
1620 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1621 | break; |
1622 | ||
1623 | if (entry->crc != crc) | |
1624 | continue; | |
1625 | ||
2369e827 LL |
1626 | /* are the originators both known and not anonymous? */ |
1627 | if (orig && !is_zero_ether_addr(orig) && | |
1628 | !is_zero_ether_addr(entry->orig)) { | |
1629 | /* If known, check if the new frame came from | |
1630 | * the same originator: | |
1631 | * We are safe to take identical frames from the | |
1632 | * same orig, if known, as multiplications in | |
1633 | * the mesh are detected via the (orig, seqno) pair. | |
1634 | * So we can be a bit more liberal here and allow | |
1635 | * identical frames from the same orig which the source | |
1636 | * host might have sent multiple times on purpose. | |
1637 | */ | |
1638 | if (batadv_compare_eth(entry->orig, orig)) | |
1639 | continue; | |
1640 | } | |
fe2da6ff SW |
1641 | |
1642 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1643 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1644 | */ |
4b426b10 | 1645 | ret = true; |
7dac7b76 | 1646 | goto out; |
fe2da6ff | 1647 | } |
7dac7b76 | 1648 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1649 | * and allow it, its the first occurrence. |
7dac7b76 | 1650 | */ |
807736f6 | 1651 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1652 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1653 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1654 | entry->crc = crc; |
1655 | entry->entrytime = jiffies; | |
2369e827 LL |
1656 | |
1657 | /* known originator */ | |
1658 | if (orig) | |
1659 | ether_addr_copy(entry->orig, orig); | |
1660 | /* anonymous originator */ | |
1661 | else | |
1662 | eth_zero_addr(entry->orig); | |
1663 | ||
807736f6 | 1664 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1665 | |
7dac7b76 LL |
1666 | out: |
1667 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1668 | ||
1669 | return ret; | |
fe2da6ff SW |
1670 | } |
1671 | ||
2369e827 LL |
1672 | /** |
1673 | * batadv_bla_check_ucast_duplist() - Check if a frame is in the broadcast dup. | |
1674 | * @bat_priv: the bat priv with all the soft interface information | |
1675 | * @skb: contains the multicast packet to be checked, decapsulated from a | |
1676 | * unicast_packet | |
1677 | * | |
1678 | * Check if it is on our broadcast list. Another gateway might have sent the | |
1679 | * same packet because it is connected to the same backbone, so we have to | |
1680 | * remove this duplicate. | |
1681 | * | |
1682 | * Return: true if a packet is in the duplicate list, false otherwise. | |
1683 | */ | |
1684 | static bool batadv_bla_check_ucast_duplist(struct batadv_priv *bat_priv, | |
1685 | struct sk_buff *skb) | |
1686 | { | |
1687 | return batadv_bla_check_duplist(bat_priv, skb, (u8 *)skb->data, NULL); | |
1688 | } | |
1689 | ||
1690 | /** | |
1691 | * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. | |
1692 | * @bat_priv: the bat priv with all the soft interface information | |
1693 | * @skb: contains the bcast_packet to be checked | |
1694 | * | |
1695 | * Check if it is on our broadcast list. Another gateway might have sent the | |
1696 | * same packet because it is connected to the same backbone, so we have to | |
1697 | * remove this duplicate. | |
1698 | * | |
1699 | * Return: true if a packet is in the duplicate list, false otherwise. | |
1700 | */ | |
1701 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, | |
1702 | struct sk_buff *skb) | |
1703 | { | |
1704 | struct batadv_bcast_packet *bcast_packet; | |
1705 | u8 *payload_ptr; | |
1706 | ||
1707 | bcast_packet = (struct batadv_bcast_packet *)skb->data; | |
1708 | payload_ptr = (u8 *)(bcast_packet + 1); | |
1709 | ||
1710 | return batadv_bla_check_duplist(bat_priv, skb, payload_ptr, | |
1711 | bcast_packet->orig); | |
1712 | } | |
1713 | ||
1b371d13 | 1714 | /** |
7e9a8c2c | 1715 | * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for |
04e14be6 | 1716 | * the VLAN identified by vid. |
1b371d13 | 1717 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1718 | * @orig: originator mac address |
cfd4f757 | 1719 | * @vid: VLAN identifier |
20ff9d59 | 1720 | * |
62fe710f | 1721 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1722 | */ |
6b5e971a | 1723 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1724 | unsigned short vid) |
20ff9d59 | 1725 | { |
807736f6 | 1726 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1727 | struct hlist_head *head; |
bae98774 | 1728 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1729 | int i; |
1730 | ||
1731 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1732 | return false; |
20ff9d59 SW |
1733 | |
1734 | if (!hash) | |
cfd4f757 | 1735 | return false; |
20ff9d59 SW |
1736 | |
1737 | for (i = 0; i < hash->size; i++) { | |
1738 | head = &hash->table[i]; | |
1739 | ||
1740 | rcu_read_lock(); | |
b67bfe0d | 1741 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1742 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1743 | backbone_gw->vid == vid) { | |
20ff9d59 | 1744 | rcu_read_unlock(); |
cfd4f757 | 1745 | return true; |
20ff9d59 SW |
1746 | } |
1747 | } | |
1748 | rcu_read_unlock(); | |
1749 | } | |
1750 | ||
cfd4f757 | 1751 | return false; |
20ff9d59 SW |
1752 | } |
1753 | ||
2c53040f | 1754 | /** |
7e9a8c2c | 1755 | * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN |
2c53040f | 1756 | * @skb: the frame to be checked |
23721387 SW |
1757 | * @orig_node: the orig_node of the frame |
1758 | * @hdr_size: maximum length of the frame | |
1759 | * | |
4b426b10 SE |
1760 | * Return: true if the orig_node is also a gateway on the soft interface, |
1761 | * otherwise it returns false. | |
23721387 | 1762 | */ |
4b426b10 SE |
1763 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1764 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1765 | { |
bae98774 | 1766 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1767 | unsigned short vid; |
23721387 SW |
1768 | |
1769 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1770 | return false; |
23721387 SW |
1771 | |
1772 | /* first, find out the vid. */ | |
0d125074 | 1773 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1774 | return false; |
23721387 | 1775 | |
c018ad3d | 1776 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1777 | |
1778 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1779 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1780 | orig_node->orig, vid); | |
23721387 | 1781 | if (!backbone_gw) |
4b426b10 | 1782 | return false; |
23721387 | 1783 | |
c8b86c12 | 1784 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1785 | return true; |
23721387 SW |
1786 | } |
1787 | ||
04e14be6 | 1788 | /** |
7e9a8c2c | 1789 | * batadv_bla_free() - free all bla structures |
04e14be6 SW |
1790 | * @bat_priv: the bat priv with all the soft interface information |
1791 | * | |
1792 | * for softinterface free or module unload | |
1793 | */ | |
56303d34 | 1794 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1795 | { |
56303d34 | 1796 | struct batadv_hard_iface *primary_if; |
23721387 | 1797 | |
807736f6 | 1798 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1799 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1800 | |
807736f6 | 1801 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1802 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1803 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1804 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1805 | } |
807736f6 | 1806 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1807 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1808 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1809 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1810 | } |
1811 | if (primary_if) | |
82047ad7 | 1812 | batadv_hardif_put(primary_if); |
23721387 SW |
1813 | } |
1814 | ||
cd9c7bfb | 1815 | /** |
7e9a8c2c | 1816 | * batadv_bla_loopdetect_check() - check and handle a detected loop |
cd9c7bfb SW |
1817 | * @bat_priv: the bat priv with all the soft interface information |
1818 | * @skb: the packet to check | |
1819 | * @primary_if: interface where the request came on | |
1820 | * @vid: the VLAN ID of the frame | |
1821 | * | |
1822 | * Checks if this packet is a loop detect frame which has been sent by us, | |
bccb48c8 | 1823 | * throws an uevent and logs the event if that is the case. |
cd9c7bfb SW |
1824 | * |
1825 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1826 | * otherwise. | |
1827 | */ | |
1828 | static bool | |
1829 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1830 | struct batadv_hard_iface *primary_if, | |
1831 | unsigned short vid) | |
1832 | { | |
1833 | struct batadv_bla_backbone_gw *backbone_gw; | |
1834 | struct ethhdr *ethhdr; | |
5af96b9c | 1835 | bool ret; |
cd9c7bfb SW |
1836 | |
1837 | ethhdr = eth_hdr(skb); | |
1838 | ||
1839 | /* Only check for the MAC address and skip more checks here for | |
1840 | * performance reasons - this function is on the hotpath, after all. | |
1841 | */ | |
1842 | if (!batadv_compare_eth(ethhdr->h_source, | |
1843 | bat_priv->bla.loopdetect_addr)) | |
1844 | return false; | |
1845 | ||
1846 | /* If the packet came too late, don't forward it on the mesh | |
1847 | * but don't consider that as loop. It might be a coincidence. | |
1848 | */ | |
1849 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1850 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1851 | return true; | |
1852 | ||
1853 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1854 | primary_if->net_dev->dev_addr, | |
1855 | vid, true); | |
1856 | if (unlikely(!backbone_gw)) | |
1857 | return true; | |
1858 | ||
5af96b9c ML |
1859 | ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work); |
1860 | ||
21ba5ab2 | 1861 | /* backbone_gw is unreferenced in the report work function |
5af96b9c ML |
1862 | * if queue_work() call was successful |
1863 | */ | |
1864 | if (!ret) | |
1865 | batadv_backbone_gw_put(backbone_gw); | |
cd9c7bfb SW |
1866 | |
1867 | return true; | |
1868 | } | |
1869 | ||
2c53040f | 1870 | /** |
7e9a8c2c | 1871 | * batadv_bla_rx() - check packets coming from the mesh. |
2c53040f | 1872 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1873 | * @skb: the frame to be checked |
1874 | * @vid: the VLAN ID of the frame | |
74c09b72 | 1875 | * @packet_type: the batman packet type this frame came in |
23721387 | 1876 | * |
04e14be6 | 1877 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1878 | * * we have to race for a claim |
1879 | * * if the frame is allowed on the LAN | |
1880 | * | |
bccb48c8 | 1881 | * In these cases, the skb is further handled by this function |
62fe710f | 1882 | * |
4b426b10 SE |
1883 | * Return: true if handled, otherwise it returns false and the caller shall |
1884 | * further process the skb. | |
23721387 | 1885 | */ |
4b426b10 | 1886 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
74c09b72 | 1887 | unsigned short vid, int packet_type) |
23721387 | 1888 | { |
3db0decf | 1889 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1890 | struct ethhdr *ethhdr; |
712bbfe4 | 1891 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1892 | struct batadv_hard_iface *primary_if; |
3db0decf | 1893 | bool own_claim; |
4b426b10 | 1894 | bool ret; |
23721387 | 1895 | |
7ed4be95 | 1896 | ethhdr = eth_hdr(skb); |
23721387 | 1897 | |
e5d89254 | 1898 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1899 | if (!primary_if) |
1900 | goto handled; | |
1901 | ||
1902 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1903 | goto allow; | |
1904 | ||
cd9c7bfb SW |
1905 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1906 | goto handled; | |
1907 | ||
807736f6 | 1908 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
74c09b72 LL |
1909 | /* don't allow multicast packets while requests are in flight */ |
1910 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1911 | /* Both broadcast flooding or multicast-via-unicasts | |
1912 | * delivery might send to multiple backbone gateways | |
1913 | * sharing the same LAN and therefore need to coordinate | |
1914 | * which backbone gateway forwards into the LAN, | |
1915 | * by claiming the payload source address. | |
1916 | * | |
1917 | * Broadcast flooding and multicast-via-unicasts | |
1918 | * delivery use the following two batman packet types. | |
1919 | * Note: explicitly exclude BATADV_UNICAST_4ADDR, | |
1920 | * as the DHCP gateway feature will send explicitly | |
1921 | * to only one BLA gateway, so the claiming process | |
1922 | * should be avoided there. | |
1923 | */ | |
1924 | if (packet_type == BATADV_BCAST || | |
1925 | packet_type == BATADV_UNICAST) | |
1926 | goto handled; | |
23721387 | 1927 | |
2369e827 LL |
1928 | /* potential duplicates from foreign BLA backbone gateways via |
1929 | * multicast-in-unicast packets | |
1930 | */ | |
1931 | if (is_multicast_ether_addr(ethhdr->h_dest) && | |
1932 | packet_type == BATADV_UNICAST && | |
1933 | batadv_bla_check_ucast_duplist(bat_priv, skb)) | |
1934 | goto handled; | |
23721387 | 1935 | |
8fdd0153 | 1936 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1937 | search_claim.vid = vid; |
3b300de3 | 1938 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1939 | |
1940 | if (!claim) { | |
1941 | /* possible optimization: race for a claim */ | |
1942 | /* No claim exists yet, claim it for us! | |
1943 | */ | |
4dd72f73 AP |
1944 | |
1945 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
1946 | "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", |
1947 | __func__, ethhdr->h_source, | |
4dd72f73 AP |
1948 | batadv_is_my_client(bat_priv, |
1949 | ethhdr->h_source, vid) ? | |
1950 | "yes" : "no"); | |
3b300de3 SE |
1951 | batadv_handle_claim(bat_priv, primary_if, |
1952 | primary_if->net_dev->dev_addr, | |
1953 | ethhdr->h_source, vid); | |
23721387 SW |
1954 | goto allow; |
1955 | } | |
1956 | ||
1957 | /* if it is our own claim ... */ | |
3db0decf SE |
1958 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
1959 | own_claim = batadv_compare_eth(backbone_gw->orig, | |
1960 | primary_if->net_dev->dev_addr); | |
1961 | batadv_backbone_gw_put(backbone_gw); | |
1962 | ||
1963 | if (own_claim) { | |
23721387 SW |
1964 | /* ... allow it in any case */ |
1965 | claim->lasttime = jiffies; | |
1966 | goto allow; | |
1967 | } | |
1968 | ||
74c09b72 LL |
1969 | /* if it is a multicast ... */ |
1970 | if (is_multicast_ether_addr(ethhdr->h_dest) && | |
1971 | (packet_type == BATADV_BCAST || packet_type == BATADV_UNICAST)) { | |
2d3f6ccc SW |
1972 | /* ... drop it. the responsible gateway is in charge. |
1973 | * | |
74c09b72 | 1974 | * We need to check packet type because with the gateway |
2d3f6ccc | 1975 | * feature, broadcasts (like DHCP requests) may be sent |
74c09b72 | 1976 | * using a unicast 4 address packet type. See comment above. |
2d3f6ccc | 1977 | */ |
23721387 SW |
1978 | goto handled; |
1979 | } else { | |
1980 | /* seems the client considers us as its best gateway. | |
1981 | * send a claim and update the claim table | |
1982 | * immediately. | |
1983 | */ | |
3b300de3 SE |
1984 | batadv_handle_claim(bat_priv, primary_if, |
1985 | primary_if->net_dev->dev_addr, | |
1986 | ethhdr->h_source, vid); | |
23721387 SW |
1987 | goto allow; |
1988 | } | |
1989 | allow: | |
3b300de3 | 1990 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1991 | ret = false; |
23721387 SW |
1992 | goto out; |
1993 | ||
1994 | handled: | |
1995 | kfree_skb(skb); | |
4b426b10 | 1996 | ret = true; |
23721387 SW |
1997 | |
1998 | out: | |
1999 | if (primary_if) | |
82047ad7 | 2000 | batadv_hardif_put(primary_if); |
23721387 | 2001 | if (claim) |
321e3e08 | 2002 | batadv_claim_put(claim); |
23721387 SW |
2003 | return ret; |
2004 | } | |
2005 | ||
2c53040f | 2006 | /** |
7e9a8c2c | 2007 | * batadv_bla_tx() - check packets going into the mesh |
2c53040f | 2008 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
2009 | * @skb: the frame to be checked |
2010 | * @vid: the VLAN ID of the frame | |
2011 | * | |
04e14be6 | 2012 | * batadv_bla_tx checks if: |
23721387 SW |
2013 | * * a claim was received which has to be processed |
2014 | * * the frame is allowed on the mesh | |
2015 | * | |
62fe710f | 2016 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
2017 | * |
2018 | * This call might reallocate skb data. | |
62fe710f | 2019 | * |
4b426b10 SE |
2020 | * Return: true if handled, otherwise it returns false and the caller shall |
2021 | * further process the skb. | |
23721387 | 2022 | */ |
4b426b10 SE |
2023 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2024 | unsigned short vid) | |
23721387 SW |
2025 | { |
2026 | struct ethhdr *ethhdr; | |
712bbfe4 | 2027 | struct batadv_bla_claim search_claim, *claim = NULL; |
3db0decf | 2028 | struct batadv_bla_backbone_gw *backbone_gw; |
56303d34 | 2029 | struct batadv_hard_iface *primary_if; |
3db0decf | 2030 | bool client_roamed; |
4b426b10 | 2031 | bool ret = false; |
23721387 | 2032 | |
e5d89254 | 2033 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
2034 | if (!primary_if) |
2035 | goto out; | |
2036 | ||
2037 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
2038 | goto allow; | |
2039 | ||
3b300de3 | 2040 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
2041 | goto handled; |
2042 | ||
7ed4be95 | 2043 | ethhdr = eth_hdr(skb); |
23721387 | 2044 | |
807736f6 | 2045 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
2046 | /* don't allow broadcasts while requests are in flight */ |
2047 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
2048 | goto handled; | |
2049 | ||
8fdd0153 | 2050 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
2051 | search_claim.vid = vid; |
2052 | ||
3b300de3 | 2053 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
2054 | |
2055 | /* if no claim exists, allow it. */ | |
2056 | if (!claim) | |
2057 | goto allow; | |
2058 | ||
2059 | /* check if we are responsible. */ | |
3db0decf SE |
2060 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
2061 | client_roamed = batadv_compare_eth(backbone_gw->orig, | |
2062 | primary_if->net_dev->dev_addr); | |
2063 | batadv_backbone_gw_put(backbone_gw); | |
2064 | ||
2065 | if (client_roamed) { | |
23721387 SW |
2066 | /* if yes, the client has roamed and we have |
2067 | * to unclaim it. | |
2068 | */ | |
a3a5129e AP |
2069 | if (batadv_has_timed_out(claim->lasttime, 100)) { |
2070 | /* only unclaim if the last claim entry is | |
2071 | * older than 100 ms to make sure we really | |
2072 | * have a roaming client here. | |
2073 | */ | |
22f0502e SE |
2074 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", |
2075 | __func__, ethhdr->h_source); | |
a3a5129e AP |
2076 | batadv_handle_unclaim(bat_priv, primary_if, |
2077 | primary_if->net_dev->dev_addr, | |
2078 | ethhdr->h_source, vid); | |
2079 | goto allow; | |
2080 | } else { | |
22f0502e SE |
2081 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", |
2082 | __func__, ethhdr->h_source); | |
a3a5129e AP |
2083 | goto handled; |
2084 | } | |
23721387 SW |
2085 | } |
2086 | ||
2087 | /* check if it is a multicast/broadcast frame */ | |
2088 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
2089 | /* drop it. the responsible gateway has forwarded it into | |
2090 | * the backbone network. | |
2091 | */ | |
2092 | goto handled; | |
2093 | } else { | |
2094 | /* we must allow it. at least if we are | |
2095 | * responsible for the DESTINATION. | |
2096 | */ | |
2097 | goto allow; | |
2098 | } | |
2099 | allow: | |
3b300de3 | 2100 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 2101 | ret = false; |
23721387 SW |
2102 | goto out; |
2103 | handled: | |
4b426b10 | 2104 | ret = true; |
23721387 SW |
2105 | out: |
2106 | if (primary_if) | |
82047ad7 | 2107 | batadv_hardif_put(primary_if); |
23721387 | 2108 | if (claim) |
321e3e08 | 2109 | batadv_claim_put(claim); |
23721387 SW |
2110 | return ret; |
2111 | } | |
9bf8e4d4 | 2112 | |
04f3f5bf | 2113 | /** |
7e9a8c2c | 2114 | * batadv_bla_claim_dump_entry() - dump one entry of the claim table |
04f3f5bf AL |
2115 | * to a netlink socket |
2116 | * @msg: buffer for the message | |
2117 | * @portid: netlink port | |
24d71b92 | 2118 | * @cb: Control block containing additional options |
04f3f5bf AL |
2119 | * @primary_if: primary interface |
2120 | * @claim: entry to dump | |
2121 | * | |
2122 | * Return: 0 or error code. | |
2123 | */ | |
2124 | static int | |
24d71b92 SE |
2125 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, |
2126 | struct netlink_callback *cb, | |
04f3f5bf AL |
2127 | struct batadv_hard_iface *primary_if, |
2128 | struct batadv_bla_claim *claim) | |
2129 | { | |
2130 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2131 | u16 backbone_crc; | |
2132 | bool is_own; | |
2133 | void *hdr; | |
2134 | int ret = -EINVAL; | |
2135 | ||
24d71b92 SE |
2136 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
2137 | &batadv_netlink_family, NLM_F_MULTI, | |
2138 | BATADV_CMD_GET_BLA_CLAIM); | |
04f3f5bf AL |
2139 | if (!hdr) { |
2140 | ret = -ENOBUFS; | |
2141 | goto out; | |
2142 | } | |
2143 | ||
24d71b92 SE |
2144 | genl_dump_check_consistent(cb, hdr); |
2145 | ||
04f3f5bf AL |
2146 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
2147 | primary_addr); | |
2148 | ||
2149 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
2150 | backbone_crc = claim->backbone_gw->crc; | |
2151 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
2152 | ||
2153 | if (is_own) | |
2154 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2155 | genlmsg_cancel(msg, hdr); | |
2156 | goto out; | |
2157 | } | |
2158 | ||
2159 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || | |
2160 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || | |
2161 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2162 | claim->backbone_gw->orig) || | |
2163 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2164 | backbone_crc)) { | |
2165 | genlmsg_cancel(msg, hdr); | |
2166 | goto out; | |
2167 | } | |
2168 | ||
2169 | genlmsg_end(msg, hdr); | |
2170 | ret = 0; | |
2171 | ||
2172 | out: | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | /** | |
7e9a8c2c | 2177 | * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table |
04f3f5bf AL |
2178 | * to a netlink socket |
2179 | * @msg: buffer for the message | |
2180 | * @portid: netlink port | |
24d71b92 | 2181 | * @cb: Control block containing additional options |
04f3f5bf | 2182 | * @primary_if: primary interface |
24d71b92 SE |
2183 | * @hash: hash to dump |
2184 | * @bucket: bucket index to dump | |
04f3f5bf AL |
2185 | * @idx_skip: How many entries to skip |
2186 | * | |
2187 | * Return: always 0. | |
2188 | */ | |
2189 | static int | |
24d71b92 SE |
2190 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, |
2191 | struct netlink_callback *cb, | |
04f3f5bf | 2192 | struct batadv_hard_iface *primary_if, |
24d71b92 SE |
2193 | struct batadv_hashtable *hash, unsigned int bucket, |
2194 | int *idx_skip) | |
04f3f5bf AL |
2195 | { |
2196 | struct batadv_bla_claim *claim; | |
2197 | int idx = 0; | |
b0264ecd | 2198 | int ret = 0; |
04f3f5bf | 2199 | |
24d71b92 SE |
2200 | spin_lock_bh(&hash->list_locks[bucket]); |
2201 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
2202 | ||
2203 | hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) { | |
04f3f5bf AL |
2204 | if (idx++ < *idx_skip) |
2205 | continue; | |
b0264ecd | 2206 | |
24d71b92 | 2207 | ret = batadv_bla_claim_dump_entry(msg, portid, cb, |
b0264ecd SE |
2208 | primary_if, claim); |
2209 | if (ret) { | |
04f3f5bf AL |
2210 | *idx_skip = idx - 1; |
2211 | goto unlock; | |
2212 | } | |
2213 | } | |
2214 | ||
b0264ecd | 2215 | *idx_skip = 0; |
04f3f5bf | 2216 | unlock: |
24d71b92 | 2217 | spin_unlock_bh(&hash->list_locks[bucket]); |
b0264ecd | 2218 | return ret; |
04f3f5bf AL |
2219 | } |
2220 | ||
2221 | /** | |
7e9a8c2c | 2222 | * batadv_bla_claim_dump() - dump claim table to a netlink socket |
04f3f5bf AL |
2223 | * @msg: buffer for the message |
2224 | * @cb: callback structure containing arguments | |
2225 | * | |
2226 | * Return: message length. | |
2227 | */ | |
2228 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2229 | { | |
2230 | struct batadv_hard_iface *primary_if = NULL; | |
2231 | int portid = NETLINK_CB(cb->skb).portid; | |
2232 | struct net *net = sock_net(cb->skb->sk); | |
2233 | struct net_device *soft_iface; | |
2234 | struct batadv_hashtable *hash; | |
2235 | struct batadv_priv *bat_priv; | |
2236 | int bucket = cb->args[0]; | |
04f3f5bf AL |
2237 | int idx = cb->args[1]; |
2238 | int ifindex; | |
2239 | int ret = 0; | |
2240 | ||
2241 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2242 | BATADV_ATTR_MESH_IFINDEX); | |
2243 | if (!ifindex) | |
2244 | return -EINVAL; | |
2245 | ||
2246 | soft_iface = dev_get_by_index(net, ifindex); | |
2247 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2248 | ret = -ENODEV; | |
2249 | goto out; | |
2250 | } | |
2251 | ||
2252 | bat_priv = netdev_priv(soft_iface); | |
2253 | hash = bat_priv->bla.claim_hash; | |
2254 | ||
2255 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2256 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2257 | ret = -ENOENT; | |
2258 | goto out; | |
2259 | } | |
2260 | ||
2261 | while (bucket < hash->size) { | |
24d71b92 SE |
2262 | if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if, |
2263 | hash, bucket, &idx)) | |
04f3f5bf AL |
2264 | break; |
2265 | bucket++; | |
2266 | } | |
2267 | ||
2268 | cb->args[0] = bucket; | |
2269 | cb->args[1] = idx; | |
2270 | ||
2271 | ret = msg->len; | |
2272 | ||
2273 | out: | |
2274 | if (primary_if) | |
2275 | batadv_hardif_put(primary_if); | |
2276 | ||
1160dfa1 | 2277 | dev_put(soft_iface); |
04f3f5bf AL |
2278 | |
2279 | return ret; | |
2280 | } | |
2281 | ||
ea4152e1 | 2282 | /** |
7e9a8c2c SE |
2283 | * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a |
2284 | * netlink socket | |
ea4152e1 SW |
2285 | * @msg: buffer for the message |
2286 | * @portid: netlink port | |
b00d0e6a | 2287 | * @cb: Control block containing additional options |
ea4152e1 SW |
2288 | * @primary_if: primary interface |
2289 | * @backbone_gw: entry to dump | |
2290 | * | |
2291 | * Return: 0 or error code. | |
2292 | */ | |
2293 | static int | |
b00d0e6a SE |
2294 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, |
2295 | struct netlink_callback *cb, | |
ea4152e1 SW |
2296 | struct batadv_hard_iface *primary_if, |
2297 | struct batadv_bla_backbone_gw *backbone_gw) | |
2298 | { | |
2299 | u8 *primary_addr = primary_if->net_dev->dev_addr; | |
2300 | u16 backbone_crc; | |
2301 | bool is_own; | |
2302 | int msecs; | |
2303 | void *hdr; | |
2304 | int ret = -EINVAL; | |
2305 | ||
b00d0e6a SE |
2306 | hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, |
2307 | &batadv_netlink_family, NLM_F_MULTI, | |
2308 | BATADV_CMD_GET_BLA_BACKBONE); | |
ea4152e1 SW |
2309 | if (!hdr) { |
2310 | ret = -ENOBUFS; | |
2311 | goto out; | |
2312 | } | |
2313 | ||
b00d0e6a SE |
2314 | genl_dump_check_consistent(cb, hdr); |
2315 | ||
ea4152e1 SW |
2316 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); |
2317 | ||
2318 | spin_lock_bh(&backbone_gw->crc_lock); | |
2319 | backbone_crc = backbone_gw->crc; | |
2320 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2321 | ||
2322 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); | |
2323 | ||
2324 | if (is_own) | |
2325 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { | |
2326 | genlmsg_cancel(msg, hdr); | |
2327 | goto out; | |
2328 | } | |
2329 | ||
2330 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, | |
2331 | backbone_gw->orig) || | |
2332 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || | |
2333 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, | |
2334 | backbone_crc) || | |
2335 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { | |
2336 | genlmsg_cancel(msg, hdr); | |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | genlmsg_end(msg, hdr); | |
2341 | ret = 0; | |
2342 | ||
2343 | out: | |
2344 | return ret; | |
2345 | } | |
2346 | ||
2347 | /** | |
7e9a8c2c SE |
2348 | * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to |
2349 | * a netlink socket | |
ea4152e1 SW |
2350 | * @msg: buffer for the message |
2351 | * @portid: netlink port | |
b00d0e6a | 2352 | * @cb: Control block containing additional options |
ea4152e1 | 2353 | * @primary_if: primary interface |
b00d0e6a SE |
2354 | * @hash: hash to dump |
2355 | * @bucket: bucket index to dump | |
ea4152e1 SW |
2356 | * @idx_skip: How many entries to skip |
2357 | * | |
2358 | * Return: always 0. | |
2359 | */ | |
2360 | static int | |
b00d0e6a SE |
2361 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, |
2362 | struct netlink_callback *cb, | |
ea4152e1 | 2363 | struct batadv_hard_iface *primary_if, |
b00d0e6a SE |
2364 | struct batadv_hashtable *hash, |
2365 | unsigned int bucket, int *idx_skip) | |
ea4152e1 SW |
2366 | { |
2367 | struct batadv_bla_backbone_gw *backbone_gw; | |
2368 | int idx = 0; | |
fce672db | 2369 | int ret = 0; |
ea4152e1 | 2370 | |
b00d0e6a SE |
2371 | spin_lock_bh(&hash->list_locks[bucket]); |
2372 | cb->seq = atomic_read(&hash->generation) << 1 | 1; | |
2373 | ||
2374 | hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) { | |
ea4152e1 SW |
2375 | if (idx++ < *idx_skip) |
2376 | continue; | |
fce672db | 2377 | |
b00d0e6a | 2378 | ret = batadv_bla_backbone_dump_entry(msg, portid, cb, |
fce672db SE |
2379 | primary_if, backbone_gw); |
2380 | if (ret) { | |
ea4152e1 SW |
2381 | *idx_skip = idx - 1; |
2382 | goto unlock; | |
2383 | } | |
2384 | } | |
2385 | ||
fce672db | 2386 | *idx_skip = 0; |
ea4152e1 | 2387 | unlock: |
b00d0e6a | 2388 | spin_unlock_bh(&hash->list_locks[bucket]); |
fce672db | 2389 | return ret; |
ea4152e1 SW |
2390 | } |
2391 | ||
2392 | /** | |
7e9a8c2c | 2393 | * batadv_bla_backbone_dump() - dump backbone table to a netlink socket |
ea4152e1 SW |
2394 | * @msg: buffer for the message |
2395 | * @cb: callback structure containing arguments | |
2396 | * | |
2397 | * Return: message length. | |
2398 | */ | |
2399 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
2400 | { | |
2401 | struct batadv_hard_iface *primary_if = NULL; | |
2402 | int portid = NETLINK_CB(cb->skb).portid; | |
2403 | struct net *net = sock_net(cb->skb->sk); | |
2404 | struct net_device *soft_iface; | |
2405 | struct batadv_hashtable *hash; | |
2406 | struct batadv_priv *bat_priv; | |
2407 | int bucket = cb->args[0]; | |
ea4152e1 SW |
2408 | int idx = cb->args[1]; |
2409 | int ifindex; | |
2410 | int ret = 0; | |
2411 | ||
2412 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
2413 | BATADV_ATTR_MESH_IFINDEX); | |
2414 | if (!ifindex) | |
2415 | return -EINVAL; | |
2416 | ||
2417 | soft_iface = dev_get_by_index(net, ifindex); | |
2418 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
2419 | ret = -ENODEV; | |
2420 | goto out; | |
2421 | } | |
2422 | ||
2423 | bat_priv = netdev_priv(soft_iface); | |
2424 | hash = bat_priv->bla.backbone_hash; | |
2425 | ||
2426 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2427 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
2428 | ret = -ENOENT; | |
2429 | goto out; | |
2430 | } | |
2431 | ||
2432 | while (bucket < hash->size) { | |
b00d0e6a SE |
2433 | if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if, |
2434 | hash, bucket, &idx)) | |
ea4152e1 SW |
2435 | break; |
2436 | bucket++; | |
2437 | } | |
2438 | ||
2439 | cb->args[0] = bucket; | |
2440 | cb->args[1] = idx; | |
2441 | ||
2442 | ret = msg->len; | |
2443 | ||
2444 | out: | |
2445 | if (primary_if) | |
2446 | batadv_hardif_put(primary_if); | |
2447 | ||
1160dfa1 | 2448 | dev_put(soft_iface); |
ea4152e1 SW |
2449 | |
2450 | return ret; | |
2451 | } | |
00311de5 AP |
2452 | |
2453 | #ifdef CONFIG_BATMAN_ADV_DAT | |
2454 | /** | |
7e9a8c2c | 2455 | * batadv_bla_check_claim() - check if address is claimed |
00311de5 AP |
2456 | * |
2457 | * @bat_priv: the bat priv with all the soft interface information | |
2458 | * @addr: mac address of which the claim status is checked | |
2459 | * @vid: the VLAN ID | |
2460 | * | |
2461 | * addr is checked if this address is claimed by the local device itself. | |
2462 | * | |
2463 | * Return: true if bla is disabled or the mac is claimed by the device, | |
2464 | * false if the device addr is already claimed by another gateway | |
2465 | */ | |
2466 | bool batadv_bla_check_claim(struct batadv_priv *bat_priv, | |
2467 | u8 *addr, unsigned short vid) | |
2468 | { | |
2469 | struct batadv_bla_claim search_claim; | |
2470 | struct batadv_bla_claim *claim = NULL; | |
2471 | struct batadv_hard_iface *primary_if = NULL; | |
2472 | bool ret = true; | |
2473 | ||
2474 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
2475 | return ret; | |
2476 | ||
2477 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
2478 | if (!primary_if) | |
2479 | return ret; | |
2480 | ||
2481 | /* First look if the mac address is claimed */ | |
2482 | ether_addr_copy(search_claim.addr, addr); | |
2483 | search_claim.vid = vid; | |
2484 | ||
2485 | claim = batadv_claim_hash_find(bat_priv, &search_claim); | |
2486 | ||
2487 | /* If there is a claim and we are not owner of the claim, | |
2488 | * return false. | |
2489 | */ | |
2490 | if (claim) { | |
2491 | if (!batadv_compare_eth(claim->backbone_gw->orig, | |
2492 | primary_if->net_dev->dev_addr)) | |
2493 | ret = false; | |
2494 | batadv_claim_put(claim); | |
2495 | } | |
2496 | ||
2497 | batadv_hardif_put(primary_if); | |
2498 | return ret; | |
2499 | } | |
2500 | #endif |