Commit | Line | Data |
---|---|---|
9f6446c7 | 1 | /* Copyright (C) 2011-2015 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> | |
34 | #include <linux/list.h> | |
35 | #include <linux/lockdep.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/rculist.h> | |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/seq_file.h> | |
40 | #include <linux/skbuff.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/spinlock.h> | |
43 | #include <linux/stddef.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/workqueue.h> | |
46 | #include <net/arp.h> | |
47 | ||
48 | #include "hard-interface.h" | |
49 | #include "hash.h" | |
50 | #include "originator.h" | |
51 | #include "packet.h" | |
52 | #include "translation-table.h" | |
23721387 | 53 | |
6b5e971a | 54 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 55 | |
3b300de3 | 56 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
57 | static void |
58 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
59 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 SW |
60 | |
61 | /* return the index of the claim */ | |
6b5e971a | 62 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 63 | { |
712bbfe4 | 64 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 65 | u32 hash = 0; |
23721387 | 66 | |
36fd61cb SE |
67 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
68 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
69 | |
70 | return hash % size; | |
71 | } | |
72 | ||
73 | /* return the index of the backbone gateway */ | |
6b5e971a | 74 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 75 | { |
712bbfe4 | 76 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 77 | u32 hash = 0; |
23721387 | 78 | |
36fd61cb SE |
79 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
80 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
81 | |
82 | return hash % size; | |
83 | } | |
84 | ||
23721387 | 85 | /* compares address and vid of two backbone gws */ |
3b300de3 SE |
86 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
87 | const void *data2) | |
23721387 | 88 | { |
bae98774 | 89 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 90 | hash_entry); |
4f248cff SE |
91 | const struct batadv_bla_backbone_gw *gw1 = data1; |
92 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 93 | |
c76d1525 SW |
94 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
95 | return 0; | |
96 | ||
97 | if (gw1->vid != gw2->vid) | |
98 | return 0; | |
99 | ||
100 | return 1; | |
23721387 SW |
101 | } |
102 | ||
103 | /* compares address and vid of two claims */ | |
3b300de3 SE |
104 | static int batadv_compare_claim(const struct hlist_node *node, |
105 | const void *data2) | |
23721387 | 106 | { |
712bbfe4 | 107 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 108 | hash_entry); |
4f248cff SE |
109 | const struct batadv_bla_claim *cl1 = data1; |
110 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
111 | |
112 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
113 | return 0; | |
114 | ||
115 | if (cl1->vid != cl2->vid) | |
116 | return 0; | |
23721387 | 117 | |
c76d1525 | 118 | return 1; |
23721387 SW |
119 | } |
120 | ||
121 | /* free a backbone gw */ | |
bae98774 ML |
122 | static void |
123 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) | |
23721387 SW |
124 | { |
125 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
126 | kfree_rcu(backbone_gw, rcu); | |
127 | } | |
128 | ||
129 | /* finally deinitialize the claim */ | |
3b300de3 | 130 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 131 | { |
712bbfe4 | 132 | struct batadv_bla_claim *claim; |
23721387 | 133 | |
712bbfe4 | 134 | claim = container_of(rcu, struct batadv_bla_claim, rcu); |
23721387 | 135 | |
3b300de3 | 136 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
137 | kfree(claim); |
138 | } | |
139 | ||
140 | /* free a claim, call claim_free_rcu if its the last reference */ | |
712bbfe4 | 141 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 SW |
142 | { |
143 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 144 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
145 | } |
146 | ||
1b371d13 SW |
147 | /** |
148 | * batadv_claim_hash_find | |
149 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
150 | * @data: search data (may be local/static data) |
151 | * | |
152 | * looks for a claim in the hash, and returns it if found | |
153 | * or NULL otherwise. | |
154 | */ | |
712bbfe4 ML |
155 | static struct batadv_bla_claim |
156 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
157 | struct batadv_bla_claim *data) | |
23721387 | 158 | { |
807736f6 | 159 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 160 | struct hlist_head *head; |
712bbfe4 ML |
161 | struct batadv_bla_claim *claim; |
162 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
163 | int index; |
164 | ||
165 | if (!hash) | |
166 | return NULL; | |
167 | ||
3b300de3 | 168 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
169 | head = &hash->table[index]; |
170 | ||
171 | rcu_read_lock(); | |
b67bfe0d | 172 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 173 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
174 | continue; |
175 | ||
176 | if (!atomic_inc_not_zero(&claim->refcount)) | |
177 | continue; | |
178 | ||
179 | claim_tmp = claim; | |
180 | break; | |
181 | } | |
182 | rcu_read_unlock(); | |
183 | ||
184 | return claim_tmp; | |
185 | } | |
186 | ||
2c53040f BH |
187 | /** |
188 | * batadv_backbone_hash_find - looks for a claim in the hash | |
189 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
190 | * @addr: the address of the originator |
191 | * @vid: the VLAN ID | |
192 | * | |
2c53040f | 193 | * Returns claim if found or NULL otherwise. |
23721387 | 194 | */ |
bae98774 | 195 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
196 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
197 | unsigned short vid) | |
23721387 | 198 | { |
807736f6 | 199 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 200 | struct hlist_head *head; |
bae98774 ML |
201 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
202 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
203 | int index; |
204 | ||
205 | if (!hash) | |
206 | return NULL; | |
207 | ||
8fdd0153 | 208 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
209 | search_entry.vid = vid; |
210 | ||
3b300de3 | 211 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
212 | head = &hash->table[index]; |
213 | ||
214 | rcu_read_lock(); | |
b67bfe0d | 215 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
216 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
217 | &search_entry)) | |
23721387 SW |
218 | continue; |
219 | ||
220 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
221 | continue; | |
222 | ||
223 | backbone_gw_tmp = backbone_gw; | |
224 | break; | |
225 | } | |
226 | rcu_read_unlock(); | |
227 | ||
228 | return backbone_gw_tmp; | |
229 | } | |
230 | ||
231 | /* delete all claims for a backbone */ | |
56303d34 | 232 | static void |
bae98774 | 233 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 234 | { |
5bf74e9c | 235 | struct batadv_hashtable *hash; |
b67bfe0d | 236 | struct hlist_node *node_tmp; |
23721387 | 237 | struct hlist_head *head; |
712bbfe4 | 238 | struct batadv_bla_claim *claim; |
23721387 SW |
239 | int i; |
240 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
241 | ||
807736f6 | 242 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
243 | if (!hash) |
244 | return; | |
245 | ||
246 | for (i = 0; i < hash->size; i++) { | |
247 | head = &hash->table[i]; | |
248 | list_lock = &hash->list_locks[i]; | |
249 | ||
250 | spin_lock_bh(list_lock); | |
b67bfe0d | 251 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 252 | head, hash_entry) { |
23721387 SW |
253 | if (claim->backbone_gw != backbone_gw) |
254 | continue; | |
255 | ||
3b300de3 | 256 | batadv_claim_free_ref(claim); |
b67bfe0d | 257 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
258 | } |
259 | spin_unlock_bh(list_lock); | |
260 | } | |
261 | ||
3f68785e | 262 | /* all claims gone, initialize CRC */ |
3964f728 | 263 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
264 | } |
265 | ||
2c53040f BH |
266 | /** |
267 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
268 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 269 | * @mac: the mac address to be announced within the claim |
23721387 SW |
270 | * @vid: the VLAN ID |
271 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 272 | */ |
6b5e971a | 273 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 274 | unsigned short vid, int claimtype) |
23721387 SW |
275 | { |
276 | struct sk_buff *skb; | |
277 | struct ethhdr *ethhdr; | |
56303d34 | 278 | struct batadv_hard_iface *primary_if; |
23721387 | 279 | struct net_device *soft_iface; |
6b5e971a | 280 | u8 *hw_src; |
96412690 | 281 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 282 | __be32 zeroip = 0; |
23721387 | 283 | |
e5d89254 | 284 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
285 | if (!primary_if) |
286 | return; | |
287 | ||
807736f6 | 288 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 289 | sizeof(local_claim_dest)); |
23721387 SW |
290 | local_claim_dest.type = claimtype; |
291 | ||
292 | soft_iface = primary_if->soft_iface; | |
293 | ||
294 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
295 | /* IP DST: 0.0.0.0 */ | |
296 | zeroip, | |
297 | primary_if->soft_iface, | |
298 | /* IP SRC: 0.0.0.0 */ | |
299 | zeroip, | |
300 | /* Ethernet DST: Broadcast */ | |
301 | NULL, | |
302 | /* Ethernet SRC/HW SRC: originator mac */ | |
303 | primary_if->net_dev->dev_addr, | |
99e966fc | 304 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 305 | * with XX = claim type |
38ef3d1d | 306 | * and YY:YY = group id |
23721387 | 307 | */ |
6b5e971a | 308 | (u8 *)&local_claim_dest); |
23721387 SW |
309 | |
310 | if (!skb) | |
311 | goto out; | |
312 | ||
313 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 314 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
315 | |
316 | /* now we pretend that the client would have sent this ... */ | |
317 | switch (claimtype) { | |
3eb8773e | 318 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
319 | /* normal claim frame |
320 | * set Ethernet SRC to the clients mac | |
321 | */ | |
8fdd0153 | 322 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 323 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
324 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
325 | BATADV_PRINT_VID(vid)); | |
23721387 | 326 | break; |
3eb8773e | 327 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
328 | /* unclaim frame |
329 | * set HW SRC to the clients mac | |
330 | */ | |
8fdd0153 | 331 | ether_addr_copy(hw_src, mac); |
39c75a51 | 332 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 333 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 334 | BATADV_PRINT_VID(vid)); |
23721387 | 335 | break; |
acd34afa | 336 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
337 | /* announcement frame |
338 | * set HW SRC to the special mac containg the crc | |
339 | */ | |
8fdd0153 | 340 | ether_addr_copy(hw_src, mac); |
39c75a51 | 341 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 342 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 343 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 344 | break; |
acd34afa | 345 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 346 | /* request frame |
99e966fc SW |
347 | * set HW SRC and header destination to the receiving backbone |
348 | * gws mac | |
23721387 | 349 | */ |
8fdd0153 AQ |
350 | ether_addr_copy(hw_src, mac); |
351 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 352 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 353 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
354 | ethhdr->h_source, ethhdr->h_dest, |
355 | BATADV_PRINT_VID(vid)); | |
23721387 | 356 | break; |
23721387 SW |
357 | } |
358 | ||
eb2deb6b AQ |
359 | if (vid & BATADV_VLAN_HAS_TAG) |
360 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
361 | vid & VLAN_VID_MASK); | |
23721387 SW |
362 | |
363 | skb_reset_mac_header(skb); | |
364 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
365 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
366 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
367 | skb->len + ETH_HLEN); | |
23721387 SW |
368 | soft_iface->last_rx = jiffies; |
369 | ||
370 | netif_rx(skb); | |
371 | out: | |
372 | if (primary_if) | |
e5d89254 | 373 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
374 | } |
375 | ||
2c53040f BH |
376 | /** |
377 | * batadv_bla_get_backbone_gw | |
378 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
379 | * @orig: the mac address of the originator |
380 | * @vid: the VLAN ID | |
e3357189 | 381 | * @own_backbone: set if the requested backbone is local |
23721387 SW |
382 | * |
383 | * searches for the backbone gw or creates a new one if it could not | |
384 | * be found. | |
385 | */ | |
bae98774 | 386 | static struct batadv_bla_backbone_gw * |
6b5e971a | 387 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 388 | unsigned short vid, bool own_backbone) |
23721387 | 389 | { |
bae98774 | 390 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 391 | struct batadv_orig_node *orig_node; |
23721387 SW |
392 | int hash_added; |
393 | ||
3b300de3 | 394 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
395 | |
396 | if (entry) | |
397 | return entry; | |
398 | ||
39c75a51 | 399 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 400 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 401 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
402 | |
403 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
404 | if (!entry) | |
405 | return NULL; | |
406 | ||
407 | entry->vid = vid; | |
408 | entry->lasttime = jiffies; | |
3964f728 | 409 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
410 | entry->bat_priv = bat_priv; |
411 | atomic_set(&entry->request_sent, 0); | |
28709878 | 412 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 413 | ether_addr_copy(entry->orig, orig); |
23721387 SW |
414 | |
415 | /* one for the hash, one for returning */ | |
416 | atomic_set(&entry->refcount, 2); | |
417 | ||
807736f6 | 418 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
419 | batadv_compare_backbone_gw, |
420 | batadv_choose_backbone_gw, entry, | |
421 | &entry->hash_entry); | |
23721387 SW |
422 | |
423 | if (unlikely(hash_added != 0)) { | |
424 | /* hash failed, free the structure */ | |
425 | kfree(entry); | |
426 | return NULL; | |
427 | } | |
428 | ||
95fb130d | 429 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 430 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 431 | if (orig_node) { |
95fb130d | 432 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 433 | "became a backbone gateway"); |
7d211efc | 434 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 435 | } |
52aebd6a | 436 | |
d807f272 | 437 | if (own_backbone) { |
52aebd6a SW |
438 | batadv_bla_send_announce(bat_priv, entry); |
439 | ||
d807f272 SW |
440 | /* this will be decreased in the worker thread */ |
441 | atomic_inc(&entry->request_sent); | |
28709878 | 442 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
443 | atomic_inc(&bat_priv->bla.num_requests); |
444 | } | |
445 | ||
23721387 SW |
446 | return entry; |
447 | } | |
448 | ||
449 | /* update or add the own backbone gw to make sure we announce | |
450 | * where we receive other backbone gws | |
451 | */ | |
56303d34 SE |
452 | static void |
453 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
454 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 455 | unsigned short vid) |
23721387 | 456 | { |
bae98774 | 457 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 458 | |
3b300de3 SE |
459 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
460 | primary_if->net_dev->dev_addr, | |
52aebd6a | 461 | vid, true); |
23721387 SW |
462 | if (unlikely(!backbone_gw)) |
463 | return; | |
464 | ||
465 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 466 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
467 | } |
468 | ||
1b371d13 SW |
469 | /** |
470 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
471 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 472 | * @primary_if: interface where the request came on |
23721387 SW |
473 | * @vid: the vid where the request came on |
474 | * | |
475 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
476 | * to allow the requester another check if the CRC is correct now. | |
477 | */ | |
56303d34 SE |
478 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
479 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 480 | unsigned short vid) |
23721387 | 481 | { |
23721387 | 482 | struct hlist_head *head; |
5bf74e9c | 483 | struct batadv_hashtable *hash; |
712bbfe4 | 484 | struct batadv_bla_claim *claim; |
bae98774 | 485 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
486 | int i; |
487 | ||
39c75a51 | 488 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 489 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 490 | |
3b300de3 SE |
491 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
492 | primary_if->net_dev->dev_addr, | |
493 | vid); | |
23721387 SW |
494 | if (!backbone_gw) |
495 | return; | |
496 | ||
807736f6 | 497 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
498 | for (i = 0; i < hash->size; i++) { |
499 | head = &hash->table[i]; | |
500 | ||
501 | rcu_read_lock(); | |
b67bfe0d | 502 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
503 | /* only own claims are interesting */ |
504 | if (claim->backbone_gw != backbone_gw) | |
505 | continue; | |
506 | ||
3b300de3 | 507 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 508 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
509 | } |
510 | rcu_read_unlock(); | |
511 | } | |
512 | ||
513 | /* finally, send an announcement frame */ | |
3b300de3 SE |
514 | batadv_bla_send_announce(bat_priv, backbone_gw); |
515 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
516 | } |
517 | ||
1b371d13 SW |
518 | /** |
519 | * batadv_bla_send_request - send a request to repeat claims | |
520 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
521 | * |
522 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
523 | * After the request, it will repeat all of his own claims and finally | |
524 | * send an announcement claim with which we can check again. | |
525 | */ | |
bae98774 | 526 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
527 | { |
528 | /* first, remove all old entries */ | |
3b300de3 | 529 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 530 | |
39c75a51 SE |
531 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
532 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
533 | |
534 | /* send request */ | |
3b300de3 | 535 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 536 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
537 | |
538 | /* no local broadcasts should be sent or received, for now. */ | |
539 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 540 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
541 | atomic_set(&backbone_gw->request_sent, 1); |
542 | } | |
543 | } | |
544 | ||
1b371d13 SW |
545 | /** |
546 | * batadv_bla_send_announce | |
547 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
548 | * @backbone_gw: our backbone gateway which should be announced |
549 | * | |
550 | * This function sends an announcement. It is called from multiple | |
551 | * places. | |
552 | */ | |
56303d34 | 553 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 554 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 555 | { |
6b5e971a | 556 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 557 | __be16 crc; |
23721387 | 558 | |
3b300de3 | 559 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 560 | crc = htons(backbone_gw->crc); |
1a5852d8 | 561 | memcpy(&mac[4], &crc, 2); |
23721387 | 562 | |
3b300de3 | 563 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 564 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
565 | } |
566 | ||
2c53040f BH |
567 | /** |
568 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
569 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
570 | * @mac: the mac address of the claim |
571 | * @vid: the VLAN ID of the frame | |
572 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 573 | */ |
56303d34 | 574 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 575 | const u8 *mac, const unsigned short vid, |
bae98774 | 576 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 577 | { |
712bbfe4 ML |
578 | struct batadv_bla_claim *claim; |
579 | struct batadv_bla_claim search_claim; | |
23721387 SW |
580 | int hash_added; |
581 | ||
8fdd0153 | 582 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 583 | search_claim.vid = vid; |
3b300de3 | 584 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
585 | |
586 | /* create a new claim entry if it does not exist yet. */ | |
587 | if (!claim) { | |
588 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
589 | if (!claim) | |
590 | return; | |
591 | ||
8fdd0153 | 592 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
593 | claim->vid = vid; |
594 | claim->lasttime = jiffies; | |
595 | claim->backbone_gw = backbone_gw; | |
596 | ||
597 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 598 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 599 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 600 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 601 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
602 | batadv_compare_claim, |
603 | batadv_choose_claim, claim, | |
604 | &claim->hash_entry); | |
23721387 SW |
605 | |
606 | if (unlikely(hash_added != 0)) { | |
607 | /* only local changes happened. */ | |
608 | kfree(claim); | |
609 | return; | |
610 | } | |
611 | } else { | |
612 | claim->lasttime = jiffies; | |
613 | if (claim->backbone_gw == backbone_gw) | |
614 | /* no need to register a new backbone */ | |
615 | goto claim_free_ref; | |
616 | ||
39c75a51 | 617 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 618 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 619 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 620 | |
bbb1f90e | 621 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 622 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
623 | } |
624 | /* set (new) backbone gw */ | |
625 | atomic_inc(&backbone_gw->refcount); | |
626 | claim->backbone_gw = backbone_gw; | |
627 | ||
628 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
629 | backbone_gw->lasttime = jiffies; | |
630 | ||
631 | claim_free_ref: | |
3b300de3 | 632 | batadv_claim_free_ref(claim); |
23721387 SW |
633 | } |
634 | ||
635 | /* Delete a claim from the claim hash which has the | |
636 | * given mac address and vid. | |
637 | */ | |
56303d34 | 638 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 639 | const u8 *mac, const unsigned short vid) |
23721387 | 640 | { |
712bbfe4 | 641 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 642 | |
8fdd0153 | 643 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 644 | search_claim.vid = vid; |
3b300de3 | 645 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
646 | if (!claim) |
647 | return; | |
648 | ||
39c75a51 | 649 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 650 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 651 | |
807736f6 | 652 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
653 | batadv_choose_claim, claim); |
654 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
655 | |
656 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
657 | ||
658 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 659 | batadv_claim_free_ref(claim); |
23721387 SW |
660 | } |
661 | ||
662 | /* check for ANNOUNCE frame, return 1 if handled */ | |
6b5e971a SE |
663 | static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
664 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 665 | { |
bae98774 | 666 | struct batadv_bla_backbone_gw *backbone_gw; |
6b5e971a | 667 | u16 crc; |
23721387 | 668 | |
3b300de3 | 669 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
670 | return 0; |
671 | ||
52aebd6a SW |
672 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
673 | false); | |
23721387 SW |
674 | |
675 | if (unlikely(!backbone_gw)) | |
676 | return 1; | |
677 | ||
23721387 SW |
678 | /* handle as ANNOUNCE frame */ |
679 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 680 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 681 | |
39c75a51 | 682 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 683 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 684 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 SW |
685 | |
686 | if (backbone_gw->crc != crc) { | |
39c75a51 | 687 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 688 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
689 | backbone_gw->orig, |
690 | BATADV_PRINT_VID(backbone_gw->vid), | |
1eda58bf | 691 | backbone_gw->crc, crc); |
23721387 | 692 | |
3b300de3 | 693 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
694 | } else { |
695 | /* if we have sent a request and the crc was OK, | |
696 | * we can allow traffic again. | |
697 | */ | |
698 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 699 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
700 | atomic_set(&backbone_gw->request_sent, 0); |
701 | } | |
702 | } | |
703 | ||
3b300de3 | 704 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
705 | return 1; |
706 | } | |
707 | ||
708 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
709 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
710 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
711 | u8 *backbone_addr, struct ethhdr *ethhdr, |
712 | unsigned short vid) | |
23721387 SW |
713 | { |
714 | /* check for REQUEST frame */ | |
1eda58bf | 715 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
716 | return 0; |
717 | ||
718 | /* sanity check, this should not happen on a normal switch, | |
719 | * we ignore it in this case. | |
720 | */ | |
1eda58bf | 721 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
722 | return 1; |
723 | ||
39c75a51 | 724 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 725 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 726 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 727 | |
3b300de3 | 728 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
729 | return 1; |
730 | } | |
731 | ||
732 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
733 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
734 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
735 | u8 *backbone_addr, u8 *claim_addr, |
736 | unsigned short vid) | |
23721387 | 737 | { |
bae98774 | 738 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
739 | |
740 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
741 | if (primary_if && batadv_compare_eth(backbone_addr, |
742 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 743 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 744 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 745 | |
3b300de3 | 746 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
747 | |
748 | if (!backbone_gw) | |
749 | return 1; | |
750 | ||
751 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 752 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 753 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 754 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 755 | |
3b300de3 SE |
756 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
757 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
758 | return 1; |
759 | } | |
760 | ||
761 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
762 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
763 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 764 | u8 *backbone_addr, u8 *claim_addr, |
eb2deb6b | 765 | unsigned short vid) |
23721387 | 766 | { |
bae98774 | 767 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
768 | |
769 | /* register the gateway if not yet available, and add the claim. */ | |
770 | ||
52aebd6a SW |
771 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
772 | false); | |
23721387 SW |
773 | |
774 | if (unlikely(!backbone_gw)) | |
775 | return 1; | |
776 | ||
777 | /* this must be a CLAIM frame */ | |
3b300de3 | 778 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 779 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 780 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 781 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
782 | |
783 | /* TODO: we could call something like tt_local_del() here. */ | |
784 | ||
3b300de3 | 785 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
786 | return 1; |
787 | } | |
788 | ||
2c53040f BH |
789 | /** |
790 | * batadv_check_claim_group | |
791 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 792 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
793 | * @hw_src: the Hardware source in the ARP Header |
794 | * @hw_dst: the Hardware destination in the ARP Header | |
795 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
796 | * | |
797 | * checks if it is a claim packet and if its on the same group. | |
798 | * This function also applies the group ID of the sender | |
799 | * if it is in the same mesh. | |
800 | * | |
801 | * returns: | |
802 | * 2 - if it is a claim packet and on the same group | |
803 | * 1 - if is a claim packet from another group | |
804 | * 0 - if it is not a claim packet | |
805 | */ | |
56303d34 SE |
806 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
807 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 808 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 809 | struct ethhdr *ethhdr) |
38ef3d1d | 810 | { |
6b5e971a | 811 | u8 *backbone_addr; |
56303d34 | 812 | struct batadv_orig_node *orig_node; |
96412690 | 813 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 814 | |
96412690 | 815 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 816 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 817 | |
38ef3d1d SW |
818 | /* if announcement packet, use the source, |
819 | * otherwise assume it is in the hw_src | |
820 | */ | |
821 | switch (bla_dst->type) { | |
3eb8773e | 822 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
823 | backbone_addr = hw_src; |
824 | break; | |
acd34afa SE |
825 | case BATADV_CLAIM_TYPE_REQUEST: |
826 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 827 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
828 | backbone_addr = ethhdr->h_source; |
829 | break; | |
830 | default: | |
831 | return 0; | |
832 | } | |
833 | ||
834 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 835 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
836 | return 0; |
837 | ||
838 | /* if its already the same group, it is fine. */ | |
839 | if (bla_dst->group == bla_dst_own->group) | |
840 | return 2; | |
841 | ||
842 | /* lets see if this originator is in our mesh */ | |
da641193 | 843 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
844 | |
845 | /* dont accept claims from gateways which are not in | |
846 | * the same mesh or group. | |
847 | */ | |
848 | if (!orig_node) | |
849 | return 1; | |
850 | ||
851 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
852 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 853 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 854 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 855 | ntohs(bla_dst->group)); |
38ef3d1d SW |
856 | bla_dst_own->group = bla_dst->group; |
857 | } | |
858 | ||
7d211efc | 859 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
860 | |
861 | return 2; | |
862 | } | |
863 | ||
1b371d13 SW |
864 | /** |
865 | * batadv_bla_process_claim | |
866 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 867 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
868 | * @skb: the frame to be checked |
869 | * | |
870 | * Check if this is a claim frame, and process it accordingly. | |
871 | * | |
872 | * returns 1 if it was a claim frame, otherwise return 0 to | |
873 | * tell the callee that it can use the frame on its own. | |
874 | */ | |
56303d34 SE |
875 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
876 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 877 | struct sk_buff *skb) |
23721387 | 878 | { |
d46b6bfa | 879 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 880 | u8 *hw_src, *hw_dst; |
d46b6bfa | 881 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 882 | struct ethhdr *ethhdr; |
23721387 | 883 | struct arphdr *arphdr; |
c018ad3d | 884 | unsigned short vid; |
d46b6bfa | 885 | int vlan_depth = 0; |
293e9338 | 886 | __be16 proto; |
23721387 | 887 | int headlen; |
38ef3d1d | 888 | int ret; |
23721387 | 889 | |
c018ad3d | 890 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 891 | ethhdr = eth_hdr(skb); |
23721387 | 892 | |
c018ad3d AQ |
893 | proto = ethhdr->h_proto; |
894 | headlen = ETH_HLEN; | |
895 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
896 | /* Traverse the VLAN/Ethertypes. |
897 | * | |
898 | * At this point it is known that the first protocol is a VLAN | |
899 | * header, so start checking at the encapsulated protocol. | |
900 | * | |
901 | * The depth of the VLAN headers is recorded to drop BLA claim | |
902 | * frames encapsulated into multiple VLAN headers (QinQ). | |
903 | */ | |
904 | do { | |
905 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
906 | &vhdr_buf); | |
907 | if (!vhdr) | |
908 | return 0; | |
909 | ||
910 | proto = vhdr->h_vlan_encapsulated_proto; | |
911 | headlen += VLAN_HLEN; | |
912 | vlan_depth++; | |
913 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
914 | } |
915 | ||
293e9338 | 916 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
917 | return 0; /* not a claim frame */ |
918 | ||
919 | /* this must be a ARP frame. check if it is a claim. */ | |
920 | ||
921 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
922 | return 0; | |
923 | ||
924 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 925 | ethhdr = eth_hdr(skb); |
6b5e971a | 926 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
927 | |
928 | /* Check whether the ARP frame carries a valid | |
929 | * IP information | |
930 | */ | |
23721387 SW |
931 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
932 | return 0; | |
933 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
934 | return 0; | |
935 | if (arphdr->ar_hln != ETH_ALEN) | |
936 | return 0; | |
937 | if (arphdr->ar_pln != 4) | |
938 | return 0; | |
939 | ||
6b5e971a | 940 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 941 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 942 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
943 | bla_dst_own = &bat_priv->bla.claim_dest; |
944 | ||
945 | /* check if it is a claim frame in general */ | |
946 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
947 | sizeof(bla_dst->magic)) != 0) | |
948 | return 0; | |
949 | ||
950 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
951 | * drop that, as this is not supported by BLA but should also not be | |
952 | * sent via the mesh. | |
953 | */ | |
954 | if (vlan_depth > 1) | |
955 | return 1; | |
23721387 SW |
956 | |
957 | /* check if it is a claim frame. */ | |
3b300de3 SE |
958 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
959 | ethhdr); | |
38ef3d1d | 960 | if (ret == 1) |
39c75a51 | 961 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 962 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
963 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
964 | hw_dst); | |
38ef3d1d SW |
965 | |
966 | if (ret < 2) | |
967 | return ret; | |
23721387 SW |
968 | |
969 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 970 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
971 | |
972 | /* check for the different types of claim frames ... */ | |
973 | switch (bla_dst->type) { | |
3eb8773e | 974 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
975 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
976 | ethhdr->h_source, vid)) | |
23721387 SW |
977 | return 1; |
978 | break; | |
3eb8773e | 979 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
980 | if (batadv_handle_unclaim(bat_priv, primary_if, |
981 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
982 | return 1; |
983 | break; | |
984 | ||
acd34afa | 985 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
986 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
987 | vid)) | |
23721387 SW |
988 | return 1; |
989 | break; | |
acd34afa | 990 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
991 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
992 | vid)) | |
23721387 SW |
993 | return 1; |
994 | break; | |
995 | } | |
996 | ||
39c75a51 | 997 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 998 | "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 | 999 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
1000 | return 1; |
1001 | } | |
1002 | ||
1003 | /* Check when we last heard from other nodes, and remove them in case of | |
1004 | * a time out, or clean all backbone gws if now is set. | |
1005 | */ | |
56303d34 | 1006 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1007 | { |
bae98774 | 1008 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1009 | struct hlist_node *node_tmp; |
23721387 | 1010 | struct hlist_head *head; |
5bf74e9c | 1011 | struct batadv_hashtable *hash; |
23721387 SW |
1012 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1013 | int i; | |
1014 | ||
807736f6 | 1015 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1016 | if (!hash) |
1017 | return; | |
1018 | ||
1019 | for (i = 0; i < hash->size; i++) { | |
1020 | head = &hash->table[i]; | |
1021 | list_lock = &hash->list_locks[i]; | |
1022 | ||
1023 | spin_lock_bh(list_lock); | |
b67bfe0d | 1024 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1025 | head, hash_entry) { |
1026 | if (now) | |
1027 | goto purge_now; | |
1eda58bf | 1028 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1029 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1030 | continue; |
1031 | ||
39c75a51 | 1032 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1033 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1034 | backbone_gw->orig); | |
23721387 SW |
1035 | |
1036 | purge_now: | |
1037 | /* don't wait for the pending request anymore */ | |
1038 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1039 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1040 | |
3b300de3 | 1041 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1042 | |
b67bfe0d | 1043 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1044 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1045 | } |
1046 | spin_unlock_bh(list_lock); | |
1047 | } | |
1048 | } | |
1049 | ||
2c53040f BH |
1050 | /** |
1051 | * batadv_bla_purge_claims | |
1052 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1053 | * @primary_if: the selected primary interface, may be NULL if now is set |
1054 | * @now: whether the whole hash shall be wiped now | |
1055 | * | |
1056 | * Check when we heard last time from our own claims, and remove them in case of | |
1057 | * a time out, or clean all claims if now is set | |
1058 | */ | |
56303d34 SE |
1059 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1060 | struct batadv_hard_iface *primary_if, | |
1061 | int now) | |
23721387 | 1062 | { |
712bbfe4 | 1063 | struct batadv_bla_claim *claim; |
23721387 | 1064 | struct hlist_head *head; |
5bf74e9c | 1065 | struct batadv_hashtable *hash; |
23721387 SW |
1066 | int i; |
1067 | ||
807736f6 | 1068 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1069 | if (!hash) |
1070 | return; | |
1071 | ||
1072 | for (i = 0; i < hash->size; i++) { | |
1073 | head = &hash->table[i]; | |
1074 | ||
1075 | rcu_read_lock(); | |
b67bfe0d | 1076 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1077 | if (now) |
1078 | goto purge_now; | |
1eda58bf SE |
1079 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1080 | primary_if->net_dev->dev_addr)) | |
23721387 | 1081 | continue; |
1eda58bf | 1082 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1083 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1084 | continue; |
1085 | ||
39c75a51 | 1086 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1087 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1088 | claim->addr, claim->vid); | |
23721387 SW |
1089 | |
1090 | purge_now: | |
3b300de3 SE |
1091 | batadv_handle_unclaim(bat_priv, primary_if, |
1092 | claim->backbone_gw->orig, | |
1093 | claim->addr, claim->vid); | |
23721387 SW |
1094 | } |
1095 | rcu_read_unlock(); | |
1096 | } | |
1097 | } | |
1098 | ||
2c53040f BH |
1099 | /** |
1100 | * batadv_bla_update_orig_address | |
1101 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1102 | * @primary_if: the new selected primary_if |
1103 | * @oldif: the old primary interface, may be NULL | |
1104 | * | |
1105 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1106 | */ |
56303d34 SE |
1107 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1108 | struct batadv_hard_iface *primary_if, | |
1109 | struct batadv_hard_iface *oldif) | |
23721387 | 1110 | { |
bae98774 | 1111 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1112 | struct hlist_head *head; |
5bf74e9c | 1113 | struct batadv_hashtable *hash; |
807736f6 | 1114 | __be16 group; |
23721387 SW |
1115 | int i; |
1116 | ||
38ef3d1d | 1117 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1118 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1119 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1120 | |
d5b4c93e SW |
1121 | /* purge everything when bridge loop avoidance is turned off */ |
1122 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1123 | oldif = NULL; | |
1124 | ||
23721387 | 1125 | if (!oldif) { |
3b300de3 SE |
1126 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1127 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1128 | return; |
1129 | } | |
1130 | ||
807736f6 | 1131 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1132 | if (!hash) |
1133 | return; | |
1134 | ||
1135 | for (i = 0; i < hash->size; i++) { | |
1136 | head = &hash->table[i]; | |
1137 | ||
1138 | rcu_read_lock(); | |
b67bfe0d | 1139 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1140 | /* own orig still holds the old value. */ |
1eda58bf SE |
1141 | if (!batadv_compare_eth(backbone_gw->orig, |
1142 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1143 | continue; |
1144 | ||
8fdd0153 AQ |
1145 | ether_addr_copy(backbone_gw->orig, |
1146 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1147 | /* send an announce frame so others will ask for our |
1148 | * claims and update their tables. | |
1149 | */ | |
3b300de3 | 1150 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1151 | } |
1152 | rcu_read_unlock(); | |
1153 | } | |
1154 | } | |
1155 | ||
23721387 SW |
1156 | /* periodic work to do: |
1157 | * * purge structures when they are too old | |
1158 | * * send announcements | |
1159 | */ | |
3b300de3 | 1160 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1161 | { |
bbb1f90e | 1162 | struct delayed_work *delayed_work; |
56303d34 | 1163 | struct batadv_priv *bat_priv; |
807736f6 | 1164 | struct batadv_priv_bla *priv_bla; |
23721387 | 1165 | struct hlist_head *head; |
bae98774 | 1166 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1167 | struct batadv_hashtable *hash; |
56303d34 | 1168 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1169 | int i; |
1170 | ||
bbb1f90e | 1171 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1172 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1173 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1174 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1175 | if (!primary_if) |
1176 | goto out; | |
1177 | ||
3b300de3 SE |
1178 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1179 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1180 | |
1181 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1182 | goto out; | |
1183 | ||
807736f6 | 1184 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1185 | if (!hash) |
1186 | goto out; | |
1187 | ||
1188 | for (i = 0; i < hash->size; i++) { | |
1189 | head = &hash->table[i]; | |
1190 | ||
1191 | rcu_read_lock(); | |
b67bfe0d | 1192 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1193 | if (!batadv_compare_eth(backbone_gw->orig, |
1194 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1195 | continue; |
1196 | ||
1197 | backbone_gw->lasttime = jiffies; | |
1198 | ||
3b300de3 | 1199 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1200 | |
1201 | /* request_sent is only set after creation to avoid | |
1202 | * problems when we are not yet known as backbone gw | |
1203 | * in the backbone. | |
1204 | * | |
28709878 SW |
1205 | * We can reset this now after we waited some periods |
1206 | * to give bridge forward delays and bla group forming | |
1207 | * some grace time. | |
d807f272 SW |
1208 | */ |
1209 | ||
1210 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1211 | continue; | |
1212 | ||
28709878 SW |
1213 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1214 | continue; | |
1215 | ||
d807f272 SW |
1216 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1217 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1218 | } |
1219 | rcu_read_unlock(); | |
1220 | } | |
1221 | out: | |
1222 | if (primary_if) | |
e5d89254 | 1223 | batadv_hardif_free_ref(primary_if); |
23721387 | 1224 | |
72414442 AQ |
1225 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1226 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1227 | } |
1228 | ||
5d52dad2 SE |
1229 | /* The hash for claim and backbone hash receive the same key because they |
1230 | * are getting initialized by hash_new with the same key. Reinitializing | |
1231 | * them with to different keys to allow nested locking without generating | |
1232 | * lockdep warnings | |
1233 | */ | |
3b300de3 SE |
1234 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1235 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1236 | |
23721387 | 1237 | /* initialize all bla structures */ |
56303d34 | 1238 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1239 | { |
fe2da6ff | 1240 | int i; |
6b5e971a | 1241 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1242 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1243 | u16 crc; |
807736f6 | 1244 | unsigned long entrytime; |
fe2da6ff | 1245 | |
7dac7b76 LL |
1246 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1247 | ||
39c75a51 | 1248 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1249 | |
38ef3d1d | 1250 | /* setting claim destination address */ |
807736f6 SE |
1251 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1252 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1253 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1254 | if (primary_if) { |
807736f6 SE |
1255 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1256 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1257 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1258 | } else { |
807736f6 | 1259 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1260 | } |
1261 | ||
fe2da6ff | 1262 | /* initialize the duplicate list */ |
807736f6 | 1263 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1264 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1265 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1266 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1267 | |
807736f6 | 1268 | if (bat_priv->bla.claim_hash) |
5346c35e | 1269 | return 0; |
23721387 | 1270 | |
807736f6 SE |
1271 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1272 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1273 | |
807736f6 | 1274 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1275 | return -ENOMEM; |
23721387 | 1276 | |
807736f6 | 1277 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1278 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1279 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1280 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1281 | |
39c75a51 | 1282 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1283 | |
72414442 AQ |
1284 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1285 | ||
1286 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1287 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1288 | return 0; |
23721387 SW |
1289 | } |
1290 | ||
2c53040f BH |
1291 | /** |
1292 | * batadv_bla_check_bcast_duplist | |
1293 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1294 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1295 | * |
1296 | * check if it is on our broadcast list. Another gateway might | |
1297 | * have sent the same packet because it is connected to the same backbone, | |
1298 | * so we have to remove this duplicate. | |
1299 | * | |
1300 | * This is performed by checking the CRC, which will tell us | |
1301 | * with a good chance that it is the same packet. If it is furthermore | |
1302 | * sent by another host, drop it. We allow equal packets from | |
1303 | * the same host however as this might be intended. | |
9cfc7bd6 | 1304 | */ |
56303d34 | 1305 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1306 | struct sk_buff *skb) |
fe2da6ff | 1307 | { |
004e86fc SW |
1308 | int i, curr, ret = 0; |
1309 | __be32 crc; | |
1310 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1311 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1312 | |
004e86fc | 1313 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1314 | |
1315 | /* calculate the crc ... */ | |
004e86fc | 1316 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1317 | |
7dac7b76 LL |
1318 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1319 | ||
42d0b044 | 1320 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1321 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1322 | curr %= BATADV_DUPLIST_SIZE; | |
1323 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1324 | |
1325 | /* we can stop searching if the entry is too old ; | |
1326 | * later entries will be even older | |
1327 | */ | |
42d0b044 SE |
1328 | if (batadv_has_timed_out(entry->entrytime, |
1329 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1330 | break; |
1331 | ||
1332 | if (entry->crc != crc) | |
1333 | continue; | |
1334 | ||
1eda58bf | 1335 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1336 | continue; |
1337 | ||
1338 | /* this entry seems to match: same crc, not too old, | |
1339 | * and from another gw. therefore return 1 to forbid it. | |
1340 | */ | |
7dac7b76 LL |
1341 | ret = 1; |
1342 | goto out; | |
fe2da6ff | 1343 | } |
7dac7b76 | 1344 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1345 | * and allow it, its the first occurrence. |
7dac7b76 | 1346 | */ |
807736f6 | 1347 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1348 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1349 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1350 | entry->crc = crc; |
1351 | entry->entrytime = jiffies; | |
8fdd0153 | 1352 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1353 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1354 | |
7dac7b76 LL |
1355 | out: |
1356 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1357 | ||
1358 | return ret; | |
fe2da6ff SW |
1359 | } |
1360 | ||
1b371d13 SW |
1361 | /** |
1362 | * batadv_bla_is_backbone_gw_orig | |
1363 | * @bat_priv: the bat priv with all the soft interface information | |
20ff9d59 | 1364 | * @orig: originator mac address |
cfd4f757 | 1365 | * @vid: VLAN identifier |
20ff9d59 | 1366 | * |
cfd4f757 | 1367 | * Check if the originator is a gateway for the VLAN identified by vid. |
20ff9d59 | 1368 | * |
cfd4f757 | 1369 | * Returns true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1370 | */ |
6b5e971a | 1371 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1372 | unsigned short vid) |
20ff9d59 | 1373 | { |
807736f6 | 1374 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1375 | struct hlist_head *head; |
bae98774 | 1376 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1377 | int i; |
1378 | ||
1379 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1380 | return false; |
20ff9d59 SW |
1381 | |
1382 | if (!hash) | |
cfd4f757 | 1383 | return false; |
20ff9d59 SW |
1384 | |
1385 | for (i = 0; i < hash->size; i++) { | |
1386 | head = &hash->table[i]; | |
1387 | ||
1388 | rcu_read_lock(); | |
b67bfe0d | 1389 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1390 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1391 | backbone_gw->vid == vid) { | |
20ff9d59 | 1392 | rcu_read_unlock(); |
cfd4f757 | 1393 | return true; |
20ff9d59 SW |
1394 | } |
1395 | } | |
1396 | rcu_read_unlock(); | |
1397 | } | |
1398 | ||
cfd4f757 | 1399 | return false; |
20ff9d59 SW |
1400 | } |
1401 | ||
2c53040f BH |
1402 | /** |
1403 | * batadv_bla_is_backbone_gw | |
1404 | * @skb: the frame to be checked | |
23721387 SW |
1405 | * @orig_node: the orig_node of the frame |
1406 | * @hdr_size: maximum length of the frame | |
1407 | * | |
1408 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1409 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1410 | * returns 0. | |
23721387 | 1411 | */ |
08adf151 | 1412 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1413 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1414 | { |
bae98774 | 1415 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1416 | unsigned short vid; |
23721387 SW |
1417 | |
1418 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1419 | return 0; | |
1420 | ||
1421 | /* first, find out the vid. */ | |
0d125074 | 1422 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1423 | return 0; |
1424 | ||
c018ad3d | 1425 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1426 | |
1427 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1428 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1429 | orig_node->orig, vid); | |
23721387 SW |
1430 | if (!backbone_gw) |
1431 | return 0; | |
1432 | ||
3b300de3 | 1433 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1434 | return 1; |
1435 | } | |
1436 | ||
1437 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1438 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1439 | { |
56303d34 | 1440 | struct batadv_hard_iface *primary_if; |
23721387 | 1441 | |
807736f6 | 1442 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1443 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1444 | |
807736f6 | 1445 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1446 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1447 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1448 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1449 | } |
807736f6 | 1450 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1451 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1452 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1453 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1454 | } |
1455 | if (primary_if) | |
e5d89254 | 1456 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1457 | } |
1458 | ||
2c53040f BH |
1459 | /** |
1460 | * batadv_bla_rx | |
1461 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1462 | * @skb: the frame to be checked |
1463 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1464 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1465 | * |
1466 | * bla_rx avoidance checks if: | |
1467 | * * we have to race for a claim | |
1468 | * * if the frame is allowed on the LAN | |
1469 | * | |
1470 | * in these cases, the skb is further handled by this function and | |
1471 | * returns 1, otherwise it returns 0 and the caller shall further | |
1472 | * process the skb. | |
23721387 | 1473 | */ |
eb2deb6b AQ |
1474 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1475 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1476 | { |
1477 | struct ethhdr *ethhdr; | |
712bbfe4 | 1478 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1479 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1480 | int ret; |
1481 | ||
7ed4be95 | 1482 | ethhdr = eth_hdr(skb); |
23721387 | 1483 | |
e5d89254 | 1484 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1485 | if (!primary_if) |
1486 | goto handled; | |
1487 | ||
1488 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1489 | goto allow; | |
1490 | ||
807736f6 | 1491 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1492 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1493 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1494 | goto handled; |
1495 | ||
8fdd0153 | 1496 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1497 | search_claim.vid = vid; |
3b300de3 | 1498 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1499 | |
1500 | if (!claim) { | |
1501 | /* possible optimization: race for a claim */ | |
1502 | /* No claim exists yet, claim it for us! | |
1503 | */ | |
3b300de3 SE |
1504 | batadv_handle_claim(bat_priv, primary_if, |
1505 | primary_if->net_dev->dev_addr, | |
1506 | ethhdr->h_source, vid); | |
23721387 SW |
1507 | goto allow; |
1508 | } | |
1509 | ||
1510 | /* if it is our own claim ... */ | |
1eda58bf SE |
1511 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1512 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1513 | /* ... allow it in any case */ |
1514 | claim->lasttime = jiffies; | |
1515 | goto allow; | |
1516 | } | |
1517 | ||
1518 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1519 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1520 | /* ... drop it. the responsible gateway is in charge. | |
1521 | * | |
1522 | * We need to check is_bcast because with the gateway | |
1523 | * feature, broadcasts (like DHCP requests) may be sent | |
1524 | * using a unicast packet type. | |
1525 | */ | |
23721387 SW |
1526 | goto handled; |
1527 | } else { | |
1528 | /* seems the client considers us as its best gateway. | |
1529 | * send a claim and update the claim table | |
1530 | * immediately. | |
1531 | */ | |
3b300de3 SE |
1532 | batadv_handle_claim(bat_priv, primary_if, |
1533 | primary_if->net_dev->dev_addr, | |
1534 | ethhdr->h_source, vid); | |
23721387 SW |
1535 | goto allow; |
1536 | } | |
1537 | allow: | |
3b300de3 | 1538 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1539 | ret = 0; |
1540 | goto out; | |
1541 | ||
1542 | handled: | |
1543 | kfree_skb(skb); | |
1544 | ret = 1; | |
1545 | ||
1546 | out: | |
1547 | if (primary_if) | |
e5d89254 | 1548 | batadv_hardif_free_ref(primary_if); |
23721387 | 1549 | if (claim) |
3b300de3 | 1550 | batadv_claim_free_ref(claim); |
23721387 SW |
1551 | return ret; |
1552 | } | |
1553 | ||
2c53040f BH |
1554 | /** |
1555 | * batadv_bla_tx | |
1556 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1557 | * @skb: the frame to be checked |
1558 | * @vid: the VLAN ID of the frame | |
1559 | * | |
1560 | * bla_tx checks if: | |
1561 | * * a claim was received which has to be processed | |
1562 | * * the frame is allowed on the mesh | |
1563 | * | |
1564 | * in these cases, the skb is further handled by this function and | |
1565 | * returns 1, otherwise it returns 0 and the caller shall further | |
1566 | * process the skb. | |
9d2c9488 LL |
1567 | * |
1568 | * This call might reallocate skb data. | |
23721387 | 1569 | */ |
eb2deb6b AQ |
1570 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1571 | unsigned short vid) | |
23721387 SW |
1572 | { |
1573 | struct ethhdr *ethhdr; | |
712bbfe4 | 1574 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1575 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1576 | int ret = 0; |
1577 | ||
e5d89254 | 1578 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1579 | if (!primary_if) |
1580 | goto out; | |
1581 | ||
1582 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1583 | goto allow; | |
1584 | ||
3b300de3 | 1585 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1586 | goto handled; |
1587 | ||
7ed4be95 | 1588 | ethhdr = eth_hdr(skb); |
23721387 | 1589 | |
807736f6 | 1590 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1591 | /* don't allow broadcasts while requests are in flight */ |
1592 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1593 | goto handled; | |
1594 | ||
8fdd0153 | 1595 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1596 | search_claim.vid = vid; |
1597 | ||
3b300de3 | 1598 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1599 | |
1600 | /* if no claim exists, allow it. */ | |
1601 | if (!claim) | |
1602 | goto allow; | |
1603 | ||
1604 | /* check if we are responsible. */ | |
1eda58bf SE |
1605 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1606 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1607 | /* if yes, the client has roamed and we have |
1608 | * to unclaim it. | |
1609 | */ | |
3b300de3 SE |
1610 | batadv_handle_unclaim(bat_priv, primary_if, |
1611 | primary_if->net_dev->dev_addr, | |
1612 | ethhdr->h_source, vid); | |
23721387 SW |
1613 | goto allow; |
1614 | } | |
1615 | ||
1616 | /* check if it is a multicast/broadcast frame */ | |
1617 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1618 | /* drop it. the responsible gateway has forwarded it into | |
1619 | * the backbone network. | |
1620 | */ | |
1621 | goto handled; | |
1622 | } else { | |
1623 | /* we must allow it. at least if we are | |
1624 | * responsible for the DESTINATION. | |
1625 | */ | |
1626 | goto allow; | |
1627 | } | |
1628 | allow: | |
3b300de3 | 1629 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1630 | ret = 0; |
1631 | goto out; | |
1632 | handled: | |
1633 | ret = 1; | |
1634 | out: | |
1635 | if (primary_if) | |
e5d89254 | 1636 | batadv_hardif_free_ref(primary_if); |
23721387 | 1637 | if (claim) |
3b300de3 | 1638 | batadv_claim_free_ref(claim); |
23721387 SW |
1639 | return ret; |
1640 | } | |
9bf8e4d4 | 1641 | |
08adf151 | 1642 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1643 | { |
1644 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1645 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1646 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1647 | struct batadv_bla_claim *claim; |
56303d34 | 1648 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 1649 | struct hlist_head *head; |
6b5e971a | 1650 | u32 i; |
9bf8e4d4 | 1651 | bool is_own; |
6b5e971a | 1652 | u8 *primary_addr; |
9bf8e4d4 | 1653 | |
30da63a6 ML |
1654 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1655 | if (!primary_if) | |
9bf8e4d4 | 1656 | goto out; |
9bf8e4d4 | 1657 | |
1eda58bf | 1658 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1659 | seq_printf(seq, |
39a32991 | 1660 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1661 | net_dev->name, primary_addr, |
807736f6 | 1662 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1663 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1664 | "Client", "VID", "Originator", "CRC"); |
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(claim, head, hash_entry) { |
1eda58bf SE |
1670 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1671 | primary_addr); | |
eb2deb6b | 1672 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1673 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1674 | claim->backbone_gw->orig, |
1675 | (is_own ? 'x' : ' '), | |
1676 | claim->backbone_gw->crc); | |
1677 | } | |
1678 | rcu_read_unlock(); | |
1679 | } | |
1680 | out: | |
1681 | if (primary_if) | |
e5d89254 | 1682 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1683 | return 0; |
9bf8e4d4 | 1684 | } |
536a23f1 SW |
1685 | |
1686 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1687 | { | |
1688 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1689 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1690 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1691 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1692 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1693 | struct hlist_head *head; |
1694 | int secs, msecs; | |
6b5e971a | 1695 | u32 i; |
536a23f1 | 1696 | bool is_own; |
6b5e971a | 1697 | u8 *primary_addr; |
536a23f1 | 1698 | |
30da63a6 ML |
1699 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1700 | if (!primary_if) | |
536a23f1 | 1701 | goto out; |
536a23f1 SW |
1702 | |
1703 | primary_addr = primary_if->net_dev->dev_addr; | |
1704 | seq_printf(seq, | |
39a32991 | 1705 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1706 | net_dev->name, primary_addr, |
807736f6 | 1707 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1708 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1709 | "Originator", "VID", "last seen", "CRC"); |
1710 | for (i = 0; i < hash->size; i++) { | |
1711 | head = &hash->table[i]; | |
1712 | ||
1713 | rcu_read_lock(); | |
b67bfe0d | 1714 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1715 | msecs = jiffies_to_msecs(jiffies - |
1716 | backbone_gw->lasttime); | |
1717 | secs = msecs / 1000; | |
1718 | msecs = msecs % 1000; | |
1719 | ||
1720 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1721 | primary_addr); | |
1722 | if (is_own) | |
1723 | continue; | |
1724 | ||
eb2deb6b | 1725 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1726 | backbone_gw->orig, |
1727 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
eb2deb6b | 1728 | msecs, backbone_gw->crc); |
536a23f1 SW |
1729 | } |
1730 | rcu_read_unlock(); | |
1731 | } | |
1732 | out: | |
1733 | if (primary_if) | |
1734 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1735 | return 0; |
536a23f1 | 1736 | } |