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