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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 */ |
5a1dd8a4 | 263 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 264 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 265 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
266 | } |
267 | ||
2c53040f BH |
268 | /** |
269 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
270 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 271 | * @mac: the mac address to be announced within the claim |
23721387 SW |
272 | * @vid: the VLAN ID |
273 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 274 | */ |
6b5e971a | 275 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 276 | unsigned short vid, int claimtype) |
23721387 SW |
277 | { |
278 | struct sk_buff *skb; | |
279 | struct ethhdr *ethhdr; | |
56303d34 | 280 | struct batadv_hard_iface *primary_if; |
23721387 | 281 | struct net_device *soft_iface; |
6b5e971a | 282 | u8 *hw_src; |
96412690 | 283 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 284 | __be32 zeroip = 0; |
23721387 | 285 | |
e5d89254 | 286 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
287 | if (!primary_if) |
288 | return; | |
289 | ||
807736f6 | 290 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 291 | sizeof(local_claim_dest)); |
23721387 SW |
292 | local_claim_dest.type = claimtype; |
293 | ||
294 | soft_iface = primary_if->soft_iface; | |
295 | ||
296 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
297 | /* IP DST: 0.0.0.0 */ | |
298 | zeroip, | |
299 | primary_if->soft_iface, | |
300 | /* IP SRC: 0.0.0.0 */ | |
301 | zeroip, | |
302 | /* Ethernet DST: Broadcast */ | |
303 | NULL, | |
304 | /* Ethernet SRC/HW SRC: originator mac */ | |
305 | primary_if->net_dev->dev_addr, | |
99e966fc | 306 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 307 | * with XX = claim type |
38ef3d1d | 308 | * and YY:YY = group id |
23721387 | 309 | */ |
6b5e971a | 310 | (u8 *)&local_claim_dest); |
23721387 SW |
311 | |
312 | if (!skb) | |
313 | goto out; | |
314 | ||
315 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 316 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
317 | |
318 | /* now we pretend that the client would have sent this ... */ | |
319 | switch (claimtype) { | |
3eb8773e | 320 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
321 | /* normal claim frame |
322 | * set Ethernet SRC to the clients mac | |
323 | */ | |
8fdd0153 | 324 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 325 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
326 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
327 | BATADV_PRINT_VID(vid)); | |
23721387 | 328 | break; |
3eb8773e | 329 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
330 | /* unclaim frame |
331 | * set HW SRC to the clients mac | |
332 | */ | |
8fdd0153 | 333 | ether_addr_copy(hw_src, mac); |
39c75a51 | 334 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 335 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 336 | BATADV_PRINT_VID(vid)); |
23721387 | 337 | break; |
acd34afa | 338 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
339 | /* announcement frame |
340 | * set HW SRC to the special mac containg the crc | |
341 | */ | |
8fdd0153 | 342 | ether_addr_copy(hw_src, mac); |
39c75a51 | 343 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 344 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 345 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 346 | break; |
acd34afa | 347 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 348 | /* request frame |
99e966fc SW |
349 | * set HW SRC and header destination to the receiving backbone |
350 | * gws mac | |
23721387 | 351 | */ |
8fdd0153 AQ |
352 | ether_addr_copy(hw_src, mac); |
353 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 354 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 355 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
356 | ethhdr->h_source, ethhdr->h_dest, |
357 | BATADV_PRINT_VID(vid)); | |
23721387 | 358 | break; |
23721387 SW |
359 | } |
360 | ||
eb2deb6b AQ |
361 | if (vid & BATADV_VLAN_HAS_TAG) |
362 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
363 | vid & VLAN_VID_MASK); | |
23721387 SW |
364 | |
365 | skb_reset_mac_header(skb); | |
366 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
367 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
368 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
369 | skb->len + ETH_HLEN); | |
23721387 SW |
370 | soft_iface->last_rx = jiffies; |
371 | ||
372 | netif_rx(skb); | |
373 | out: | |
374 | if (primary_if) | |
e5d89254 | 375 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
376 | } |
377 | ||
2c53040f BH |
378 | /** |
379 | * batadv_bla_get_backbone_gw | |
380 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
381 | * @orig: the mac address of the originator |
382 | * @vid: the VLAN ID | |
e3357189 | 383 | * @own_backbone: set if the requested backbone is local |
23721387 SW |
384 | * |
385 | * searches for the backbone gw or creates a new one if it could not | |
386 | * be found. | |
387 | */ | |
bae98774 | 388 | static struct batadv_bla_backbone_gw * |
6b5e971a | 389 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 390 | unsigned short vid, bool own_backbone) |
23721387 | 391 | { |
bae98774 | 392 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 393 | struct batadv_orig_node *orig_node; |
23721387 SW |
394 | int hash_added; |
395 | ||
3b300de3 | 396 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
397 | |
398 | if (entry) | |
399 | return entry; | |
400 | ||
39c75a51 | 401 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 402 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 403 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
404 | |
405 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
406 | if (!entry) | |
407 | return NULL; | |
408 | ||
409 | entry->vid = vid; | |
410 | entry->lasttime = jiffies; | |
3964f728 | 411 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 412 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 413 | spin_lock_init(&entry->crc_lock); |
23721387 | 414 | atomic_set(&entry->request_sent, 0); |
28709878 | 415 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 416 | ether_addr_copy(entry->orig, orig); |
23721387 SW |
417 | |
418 | /* one for the hash, one for returning */ | |
419 | atomic_set(&entry->refcount, 2); | |
420 | ||
807736f6 | 421 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
422 | batadv_compare_backbone_gw, |
423 | batadv_choose_backbone_gw, entry, | |
424 | &entry->hash_entry); | |
23721387 SW |
425 | |
426 | if (unlikely(hash_added != 0)) { | |
427 | /* hash failed, free the structure */ | |
428 | kfree(entry); | |
429 | return NULL; | |
430 | } | |
431 | ||
95fb130d | 432 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 433 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 434 | if (orig_node) { |
95fb130d | 435 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 436 | "became a backbone gateway"); |
7d211efc | 437 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 438 | } |
52aebd6a | 439 | |
d807f272 | 440 | if (own_backbone) { |
52aebd6a SW |
441 | batadv_bla_send_announce(bat_priv, entry); |
442 | ||
d807f272 SW |
443 | /* this will be decreased in the worker thread */ |
444 | atomic_inc(&entry->request_sent); | |
28709878 | 445 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
446 | atomic_inc(&bat_priv->bla.num_requests); |
447 | } | |
448 | ||
23721387 SW |
449 | return entry; |
450 | } | |
451 | ||
452 | /* update or add the own backbone gw to make sure we announce | |
453 | * where we receive other backbone gws | |
454 | */ | |
56303d34 SE |
455 | static void |
456 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
457 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 458 | unsigned short vid) |
23721387 | 459 | { |
bae98774 | 460 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 461 | |
3b300de3 SE |
462 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
463 | primary_if->net_dev->dev_addr, | |
52aebd6a | 464 | vid, true); |
23721387 SW |
465 | if (unlikely(!backbone_gw)) |
466 | return; | |
467 | ||
468 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 469 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
470 | } |
471 | ||
1b371d13 SW |
472 | /** |
473 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
474 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 475 | * @primary_if: interface where the request came on |
23721387 SW |
476 | * @vid: the vid where the request came on |
477 | * | |
478 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
479 | * to allow the requester another check if the CRC is correct now. | |
480 | */ | |
56303d34 SE |
481 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
482 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 483 | unsigned short vid) |
23721387 | 484 | { |
23721387 | 485 | struct hlist_head *head; |
5bf74e9c | 486 | struct batadv_hashtable *hash; |
712bbfe4 | 487 | struct batadv_bla_claim *claim; |
bae98774 | 488 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
489 | int i; |
490 | ||
39c75a51 | 491 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 492 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 493 | |
3b300de3 SE |
494 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
495 | primary_if->net_dev->dev_addr, | |
496 | vid); | |
23721387 SW |
497 | if (!backbone_gw) |
498 | return; | |
499 | ||
807736f6 | 500 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
501 | for (i = 0; i < hash->size; i++) { |
502 | head = &hash->table[i]; | |
503 | ||
504 | rcu_read_lock(); | |
b67bfe0d | 505 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
506 | /* only own claims are interesting */ |
507 | if (claim->backbone_gw != backbone_gw) | |
508 | continue; | |
509 | ||
3b300de3 | 510 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 511 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
512 | } |
513 | rcu_read_unlock(); | |
514 | } | |
515 | ||
516 | /* finally, send an announcement frame */ | |
3b300de3 SE |
517 | batadv_bla_send_announce(bat_priv, backbone_gw); |
518 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
519 | } |
520 | ||
1b371d13 SW |
521 | /** |
522 | * batadv_bla_send_request - send a request to repeat claims | |
523 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
524 | * |
525 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
526 | * After the request, it will repeat all of his own claims and finally | |
527 | * send an announcement claim with which we can check again. | |
528 | */ | |
bae98774 | 529 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
530 | { |
531 | /* first, remove all old entries */ | |
3b300de3 | 532 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 533 | |
39c75a51 SE |
534 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
535 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
536 | |
537 | /* send request */ | |
3b300de3 | 538 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 539 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
540 | |
541 | /* no local broadcasts should be sent or received, for now. */ | |
542 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 543 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
544 | atomic_set(&backbone_gw->request_sent, 1); |
545 | } | |
546 | } | |
547 | ||
1b371d13 SW |
548 | /** |
549 | * batadv_bla_send_announce | |
550 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
551 | * @backbone_gw: our backbone gateway which should be announced |
552 | * | |
553 | * This function sends an announcement. It is called from multiple | |
554 | * places. | |
555 | */ | |
56303d34 | 556 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 557 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 558 | { |
6b5e971a | 559 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 560 | __be16 crc; |
23721387 | 561 | |
3b300de3 | 562 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 563 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 564 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 565 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 566 | memcpy(&mac[4], &crc, 2); |
23721387 | 567 | |
3b300de3 | 568 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 569 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
570 | } |
571 | ||
2c53040f BH |
572 | /** |
573 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
574 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
575 | * @mac: the mac address of the claim |
576 | * @vid: the VLAN ID of the frame | |
577 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 578 | */ |
56303d34 | 579 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 580 | const u8 *mac, const unsigned short vid, |
bae98774 | 581 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 582 | { |
712bbfe4 ML |
583 | struct batadv_bla_claim *claim; |
584 | struct batadv_bla_claim search_claim; | |
23721387 SW |
585 | int hash_added; |
586 | ||
8fdd0153 | 587 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 588 | search_claim.vid = vid; |
3b300de3 | 589 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
590 | |
591 | /* create a new claim entry if it does not exist yet. */ | |
592 | if (!claim) { | |
593 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
594 | if (!claim) | |
595 | return; | |
596 | ||
8fdd0153 | 597 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
598 | claim->vid = vid; |
599 | claim->lasttime = jiffies; | |
600 | claim->backbone_gw = backbone_gw; | |
601 | ||
602 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 603 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 604 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 605 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 606 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
607 | batadv_compare_claim, |
608 | batadv_choose_claim, claim, | |
609 | &claim->hash_entry); | |
23721387 SW |
610 | |
611 | if (unlikely(hash_added != 0)) { | |
612 | /* only local changes happened. */ | |
613 | kfree(claim); | |
614 | return; | |
615 | } | |
616 | } else { | |
617 | claim->lasttime = jiffies; | |
618 | if (claim->backbone_gw == backbone_gw) | |
619 | /* no need to register a new backbone */ | |
620 | goto claim_free_ref; | |
621 | ||
39c75a51 | 622 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 623 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 624 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 625 | |
5a1dd8a4 | 626 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
bbb1f90e | 627 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 628 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
3b300de3 | 629 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
630 | } |
631 | /* set (new) backbone gw */ | |
632 | atomic_inc(&backbone_gw->refcount); | |
633 | claim->backbone_gw = backbone_gw; | |
634 | ||
5a1dd8a4 | 635 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 636 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 637 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
638 | backbone_gw->lasttime = jiffies; |
639 | ||
640 | claim_free_ref: | |
3b300de3 | 641 | batadv_claim_free_ref(claim); |
23721387 SW |
642 | } |
643 | ||
644 | /* Delete a claim from the claim hash which has the | |
645 | * given mac address and vid. | |
646 | */ | |
56303d34 | 647 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 648 | const u8 *mac, const unsigned short vid) |
23721387 | 649 | { |
712bbfe4 | 650 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 651 | |
8fdd0153 | 652 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 653 | search_claim.vid = vid; |
3b300de3 | 654 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
655 | if (!claim) |
656 | return; | |
657 | ||
39c75a51 | 658 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 659 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 660 | |
807736f6 | 661 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
662 | batadv_choose_claim, claim); |
663 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 | 664 | |
5a1dd8a4 | 665 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
23721387 | 666 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 667 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
23721387 SW |
668 | |
669 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 670 | batadv_claim_free_ref(claim); |
23721387 SW |
671 | } |
672 | ||
673 | /* check for ANNOUNCE frame, return 1 if handled */ | |
6b5e971a SE |
674 | static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
675 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 676 | { |
bae98774 | 677 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 678 | u16 backbone_crc, crc; |
23721387 | 679 | |
3b300de3 | 680 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
681 | return 0; |
682 | ||
52aebd6a SW |
683 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
684 | false); | |
23721387 SW |
685 | |
686 | if (unlikely(!backbone_gw)) | |
687 | return 1; | |
688 | ||
23721387 SW |
689 | /* handle as ANNOUNCE frame */ |
690 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 691 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 692 | |
39c75a51 | 693 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 694 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 695 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 696 | |
5a1dd8a4 SW |
697 | spin_lock_bh(&backbone_gw->crc_lock); |
698 | backbone_crc = backbone_gw->crc; | |
699 | spin_unlock_bh(&backbone_gw->crc_lock); | |
700 | ||
701 | if (backbone_crc != crc) { | |
39c75a51 | 702 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 703 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
704 | backbone_gw->orig, |
705 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 706 | backbone_crc, crc); |
23721387 | 707 | |
3b300de3 | 708 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
709 | } else { |
710 | /* if we have sent a request and the crc was OK, | |
711 | * we can allow traffic again. | |
712 | */ | |
713 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 714 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
715 | atomic_set(&backbone_gw->request_sent, 0); |
716 | } | |
717 | } | |
718 | ||
3b300de3 | 719 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
720 | return 1; |
721 | } | |
722 | ||
723 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
724 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
725 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
726 | u8 *backbone_addr, struct ethhdr *ethhdr, |
727 | unsigned short vid) | |
23721387 SW |
728 | { |
729 | /* check for REQUEST frame */ | |
1eda58bf | 730 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
731 | return 0; |
732 | ||
733 | /* sanity check, this should not happen on a normal switch, | |
734 | * we ignore it in this case. | |
735 | */ | |
1eda58bf | 736 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
737 | return 1; |
738 | ||
39c75a51 | 739 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 740 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 741 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 742 | |
3b300de3 | 743 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
744 | return 1; |
745 | } | |
746 | ||
747 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
748 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
749 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
750 | u8 *backbone_addr, u8 *claim_addr, |
751 | unsigned short vid) | |
23721387 | 752 | { |
bae98774 | 753 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
754 | |
755 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
756 | if (primary_if && batadv_compare_eth(backbone_addr, |
757 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 758 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 759 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 760 | |
3b300de3 | 761 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
762 | |
763 | if (!backbone_gw) | |
764 | return 1; | |
765 | ||
766 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 767 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 768 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 769 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 770 | |
3b300de3 SE |
771 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
772 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
773 | return 1; |
774 | } | |
775 | ||
776 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
777 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
778 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 779 | u8 *backbone_addr, u8 *claim_addr, |
eb2deb6b | 780 | unsigned short vid) |
23721387 | 781 | { |
bae98774 | 782 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
783 | |
784 | /* register the gateway if not yet available, and add the claim. */ | |
785 | ||
52aebd6a SW |
786 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
787 | false); | |
23721387 SW |
788 | |
789 | if (unlikely(!backbone_gw)) | |
790 | return 1; | |
791 | ||
792 | /* this must be a CLAIM frame */ | |
3b300de3 | 793 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 794 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 795 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 796 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
797 | |
798 | /* TODO: we could call something like tt_local_del() here. */ | |
799 | ||
3b300de3 | 800 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
801 | return 1; |
802 | } | |
803 | ||
2c53040f BH |
804 | /** |
805 | * batadv_check_claim_group | |
806 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 807 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
808 | * @hw_src: the Hardware source in the ARP Header |
809 | * @hw_dst: the Hardware destination in the ARP Header | |
810 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
811 | * | |
812 | * checks if it is a claim packet and if its on the same group. | |
813 | * This function also applies the group ID of the sender | |
814 | * if it is in the same mesh. | |
815 | * | |
816 | * returns: | |
817 | * 2 - if it is a claim packet and on the same group | |
818 | * 1 - if is a claim packet from another group | |
819 | * 0 - if it is not a claim packet | |
820 | */ | |
56303d34 SE |
821 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
822 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 823 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 824 | struct ethhdr *ethhdr) |
38ef3d1d | 825 | { |
6b5e971a | 826 | u8 *backbone_addr; |
56303d34 | 827 | struct batadv_orig_node *orig_node; |
96412690 | 828 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 829 | |
96412690 | 830 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 831 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 832 | |
38ef3d1d SW |
833 | /* if announcement packet, use the source, |
834 | * otherwise assume it is in the hw_src | |
835 | */ | |
836 | switch (bla_dst->type) { | |
3eb8773e | 837 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
838 | backbone_addr = hw_src; |
839 | break; | |
acd34afa SE |
840 | case BATADV_CLAIM_TYPE_REQUEST: |
841 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 842 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
843 | backbone_addr = ethhdr->h_source; |
844 | break; | |
845 | default: | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 850 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
851 | return 0; |
852 | ||
853 | /* if its already the same group, it is fine. */ | |
854 | if (bla_dst->group == bla_dst_own->group) | |
855 | return 2; | |
856 | ||
857 | /* lets see if this originator is in our mesh */ | |
da641193 | 858 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
859 | |
860 | /* dont accept claims from gateways which are not in | |
861 | * the same mesh or group. | |
862 | */ | |
863 | if (!orig_node) | |
864 | return 1; | |
865 | ||
866 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
867 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 868 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 869 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 870 | ntohs(bla_dst->group)); |
38ef3d1d SW |
871 | bla_dst_own->group = bla_dst->group; |
872 | } | |
873 | ||
7d211efc | 874 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
875 | |
876 | return 2; | |
877 | } | |
878 | ||
1b371d13 SW |
879 | /** |
880 | * batadv_bla_process_claim | |
881 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 882 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
883 | * @skb: the frame to be checked |
884 | * | |
885 | * Check if this is a claim frame, and process it accordingly. | |
886 | * | |
887 | * returns 1 if it was a claim frame, otherwise return 0 to | |
888 | * tell the callee that it can use the frame on its own. | |
889 | */ | |
56303d34 SE |
890 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
891 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 892 | struct sk_buff *skb) |
23721387 | 893 | { |
d46b6bfa | 894 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 895 | u8 *hw_src, *hw_dst; |
d46b6bfa | 896 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 897 | struct ethhdr *ethhdr; |
23721387 | 898 | struct arphdr *arphdr; |
c018ad3d | 899 | unsigned short vid; |
d46b6bfa | 900 | int vlan_depth = 0; |
293e9338 | 901 | __be16 proto; |
23721387 | 902 | int headlen; |
38ef3d1d | 903 | int ret; |
23721387 | 904 | |
c018ad3d | 905 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 906 | ethhdr = eth_hdr(skb); |
23721387 | 907 | |
c018ad3d AQ |
908 | proto = ethhdr->h_proto; |
909 | headlen = ETH_HLEN; | |
910 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
911 | /* Traverse the VLAN/Ethertypes. |
912 | * | |
913 | * At this point it is known that the first protocol is a VLAN | |
914 | * header, so start checking at the encapsulated protocol. | |
915 | * | |
916 | * The depth of the VLAN headers is recorded to drop BLA claim | |
917 | * frames encapsulated into multiple VLAN headers (QinQ). | |
918 | */ | |
919 | do { | |
920 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
921 | &vhdr_buf); | |
922 | if (!vhdr) | |
923 | return 0; | |
924 | ||
925 | proto = vhdr->h_vlan_encapsulated_proto; | |
926 | headlen += VLAN_HLEN; | |
927 | vlan_depth++; | |
928 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
929 | } |
930 | ||
293e9338 | 931 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
932 | return 0; /* not a claim frame */ |
933 | ||
934 | /* this must be a ARP frame. check if it is a claim. */ | |
935 | ||
936 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
937 | return 0; | |
938 | ||
939 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 940 | ethhdr = eth_hdr(skb); |
6b5e971a | 941 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
942 | |
943 | /* Check whether the ARP frame carries a valid | |
944 | * IP information | |
945 | */ | |
23721387 SW |
946 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
947 | return 0; | |
948 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
949 | return 0; | |
950 | if (arphdr->ar_hln != ETH_ALEN) | |
951 | return 0; | |
952 | if (arphdr->ar_pln != 4) | |
953 | return 0; | |
954 | ||
6b5e971a | 955 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 956 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 957 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
958 | bla_dst_own = &bat_priv->bla.claim_dest; |
959 | ||
960 | /* check if it is a claim frame in general */ | |
961 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
962 | sizeof(bla_dst->magic)) != 0) | |
963 | return 0; | |
964 | ||
965 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
966 | * drop that, as this is not supported by BLA but should also not be | |
967 | * sent via the mesh. | |
968 | */ | |
969 | if (vlan_depth > 1) | |
970 | return 1; | |
23721387 SW |
971 | |
972 | /* check if it is a claim frame. */ | |
3b300de3 SE |
973 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
974 | ethhdr); | |
38ef3d1d | 975 | if (ret == 1) |
39c75a51 | 976 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 977 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
978 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
979 | hw_dst); | |
38ef3d1d SW |
980 | |
981 | if (ret < 2) | |
982 | return ret; | |
23721387 SW |
983 | |
984 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 985 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
986 | |
987 | /* check for the different types of claim frames ... */ | |
988 | switch (bla_dst->type) { | |
3eb8773e | 989 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
990 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
991 | ethhdr->h_source, vid)) | |
23721387 SW |
992 | return 1; |
993 | break; | |
3eb8773e | 994 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
995 | if (batadv_handle_unclaim(bat_priv, primary_if, |
996 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
997 | return 1; |
998 | break; | |
999 | ||
acd34afa | 1000 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1001 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1002 | vid)) | |
23721387 SW |
1003 | return 1; |
1004 | break; | |
acd34afa | 1005 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1006 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1007 | vid)) | |
23721387 SW |
1008 | return 1; |
1009 | break; | |
1010 | } | |
1011 | ||
39c75a51 | 1012 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1013 | "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 | 1014 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
1015 | return 1; |
1016 | } | |
1017 | ||
1018 | /* Check when we last heard from other nodes, and remove them in case of | |
1019 | * a time out, or clean all backbone gws if now is set. | |
1020 | */ | |
56303d34 | 1021 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1022 | { |
bae98774 | 1023 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1024 | struct hlist_node *node_tmp; |
23721387 | 1025 | struct hlist_head *head; |
5bf74e9c | 1026 | struct batadv_hashtable *hash; |
23721387 SW |
1027 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1028 | int i; | |
1029 | ||
807736f6 | 1030 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1031 | if (!hash) |
1032 | return; | |
1033 | ||
1034 | for (i = 0; i < hash->size; i++) { | |
1035 | head = &hash->table[i]; | |
1036 | list_lock = &hash->list_locks[i]; | |
1037 | ||
1038 | spin_lock_bh(list_lock); | |
b67bfe0d | 1039 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1040 | head, hash_entry) { |
1041 | if (now) | |
1042 | goto purge_now; | |
1eda58bf | 1043 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1044 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1045 | continue; |
1046 | ||
39c75a51 | 1047 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1048 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1049 | backbone_gw->orig); | |
23721387 SW |
1050 | |
1051 | purge_now: | |
1052 | /* don't wait for the pending request anymore */ | |
1053 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1054 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1055 | |
3b300de3 | 1056 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1057 | |
b67bfe0d | 1058 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1059 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1060 | } |
1061 | spin_unlock_bh(list_lock); | |
1062 | } | |
1063 | } | |
1064 | ||
2c53040f BH |
1065 | /** |
1066 | * batadv_bla_purge_claims | |
1067 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1068 | * @primary_if: the selected primary interface, may be NULL if now is set |
1069 | * @now: whether the whole hash shall be wiped now | |
1070 | * | |
1071 | * Check when we heard last time from our own claims, and remove them in case of | |
1072 | * a time out, or clean all claims if now is set | |
1073 | */ | |
56303d34 SE |
1074 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1075 | struct batadv_hard_iface *primary_if, | |
1076 | int now) | |
23721387 | 1077 | { |
712bbfe4 | 1078 | struct batadv_bla_claim *claim; |
23721387 | 1079 | struct hlist_head *head; |
5bf74e9c | 1080 | struct batadv_hashtable *hash; |
23721387 SW |
1081 | int i; |
1082 | ||
807736f6 | 1083 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1084 | if (!hash) |
1085 | return; | |
1086 | ||
1087 | for (i = 0; i < hash->size; i++) { | |
1088 | head = &hash->table[i]; | |
1089 | ||
1090 | rcu_read_lock(); | |
b67bfe0d | 1091 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1092 | if (now) |
1093 | goto purge_now; | |
1eda58bf SE |
1094 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1095 | primary_if->net_dev->dev_addr)) | |
23721387 | 1096 | continue; |
1eda58bf | 1097 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1098 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1099 | continue; |
1100 | ||
39c75a51 | 1101 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1102 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1103 | claim->addr, claim->vid); | |
23721387 SW |
1104 | |
1105 | purge_now: | |
3b300de3 SE |
1106 | batadv_handle_unclaim(bat_priv, primary_if, |
1107 | claim->backbone_gw->orig, | |
1108 | claim->addr, claim->vid); | |
23721387 SW |
1109 | } |
1110 | rcu_read_unlock(); | |
1111 | } | |
1112 | } | |
1113 | ||
2c53040f BH |
1114 | /** |
1115 | * batadv_bla_update_orig_address | |
1116 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1117 | * @primary_if: the new selected primary_if |
1118 | * @oldif: the old primary interface, may be NULL | |
1119 | * | |
1120 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1121 | */ |
56303d34 SE |
1122 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1123 | struct batadv_hard_iface *primary_if, | |
1124 | struct batadv_hard_iface *oldif) | |
23721387 | 1125 | { |
bae98774 | 1126 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1127 | struct hlist_head *head; |
5bf74e9c | 1128 | struct batadv_hashtable *hash; |
807736f6 | 1129 | __be16 group; |
23721387 SW |
1130 | int i; |
1131 | ||
38ef3d1d | 1132 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1133 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1134 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1135 | |
d5b4c93e SW |
1136 | /* purge everything when bridge loop avoidance is turned off */ |
1137 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1138 | oldif = NULL; | |
1139 | ||
23721387 | 1140 | if (!oldif) { |
3b300de3 SE |
1141 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1142 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1143 | return; |
1144 | } | |
1145 | ||
807736f6 | 1146 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1147 | if (!hash) |
1148 | return; | |
1149 | ||
1150 | for (i = 0; i < hash->size; i++) { | |
1151 | head = &hash->table[i]; | |
1152 | ||
1153 | rcu_read_lock(); | |
b67bfe0d | 1154 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1155 | /* own orig still holds the old value. */ |
1eda58bf SE |
1156 | if (!batadv_compare_eth(backbone_gw->orig, |
1157 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1158 | continue; |
1159 | ||
8fdd0153 AQ |
1160 | ether_addr_copy(backbone_gw->orig, |
1161 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1162 | /* send an announce frame so others will ask for our |
1163 | * claims and update their tables. | |
1164 | */ | |
3b300de3 | 1165 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1166 | } |
1167 | rcu_read_unlock(); | |
1168 | } | |
1169 | } | |
1170 | ||
d68081a2 SW |
1171 | /** |
1172 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1173 | * @net_dev: the soft interface net device | |
1174 | */ | |
1175 | void batadv_bla_status_update(struct net_device *net_dev) | |
1176 | { | |
1177 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1178 | struct batadv_hard_iface *primary_if; | |
1179 | ||
1180 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1181 | if (!primary_if) | |
1182 | return; | |
1183 | ||
1184 | /* this function already purges everything when bla is disabled, | |
1185 | * so just call that one. | |
1186 | */ | |
1187 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
1188 | batadv_hardif_free_ref(primary_if); | |
1189 | } | |
1190 | ||
23721387 SW |
1191 | /* periodic work to do: |
1192 | * * purge structures when they are too old | |
1193 | * * send announcements | |
1194 | */ | |
3b300de3 | 1195 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1196 | { |
bbb1f90e | 1197 | struct delayed_work *delayed_work; |
56303d34 | 1198 | struct batadv_priv *bat_priv; |
807736f6 | 1199 | struct batadv_priv_bla *priv_bla; |
23721387 | 1200 | struct hlist_head *head; |
bae98774 | 1201 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1202 | struct batadv_hashtable *hash; |
56303d34 | 1203 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1204 | int i; |
1205 | ||
bbb1f90e | 1206 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1207 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1208 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1209 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1210 | if (!primary_if) |
1211 | goto out; | |
1212 | ||
3b300de3 SE |
1213 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1214 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1215 | |
1216 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1217 | goto out; | |
1218 | ||
807736f6 | 1219 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1220 | if (!hash) |
1221 | goto out; | |
1222 | ||
1223 | for (i = 0; i < hash->size; i++) { | |
1224 | head = &hash->table[i]; | |
1225 | ||
1226 | rcu_read_lock(); | |
b67bfe0d | 1227 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1228 | if (!batadv_compare_eth(backbone_gw->orig, |
1229 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1230 | continue; |
1231 | ||
1232 | backbone_gw->lasttime = jiffies; | |
1233 | ||
3b300de3 | 1234 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1235 | |
1236 | /* request_sent is only set after creation to avoid | |
1237 | * problems when we are not yet known as backbone gw | |
1238 | * in the backbone. | |
1239 | * | |
28709878 SW |
1240 | * We can reset this now after we waited some periods |
1241 | * to give bridge forward delays and bla group forming | |
1242 | * some grace time. | |
d807f272 SW |
1243 | */ |
1244 | ||
1245 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1246 | continue; | |
1247 | ||
28709878 SW |
1248 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1249 | continue; | |
1250 | ||
d807f272 SW |
1251 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1252 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1253 | } |
1254 | rcu_read_unlock(); | |
1255 | } | |
1256 | out: | |
1257 | if (primary_if) | |
e5d89254 | 1258 | batadv_hardif_free_ref(primary_if); |
23721387 | 1259 | |
72414442 AQ |
1260 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1261 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1262 | } |
1263 | ||
5d52dad2 SE |
1264 | /* The hash for claim and backbone hash receive the same key because they |
1265 | * are getting initialized by hash_new with the same key. Reinitializing | |
1266 | * them with to different keys to allow nested locking without generating | |
1267 | * lockdep warnings | |
1268 | */ | |
3b300de3 SE |
1269 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1270 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1271 | |
23721387 | 1272 | /* initialize all bla structures */ |
56303d34 | 1273 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1274 | { |
fe2da6ff | 1275 | int i; |
6b5e971a | 1276 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1277 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1278 | u16 crc; |
807736f6 | 1279 | unsigned long entrytime; |
fe2da6ff | 1280 | |
7dac7b76 LL |
1281 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1282 | ||
39c75a51 | 1283 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1284 | |
38ef3d1d | 1285 | /* setting claim destination address */ |
807736f6 SE |
1286 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1287 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1288 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1289 | if (primary_if) { |
807736f6 SE |
1290 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1291 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1292 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1293 | } else { |
807736f6 | 1294 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1295 | } |
1296 | ||
fe2da6ff | 1297 | /* initialize the duplicate list */ |
807736f6 | 1298 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1299 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1300 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1301 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1302 | |
807736f6 | 1303 | if (bat_priv->bla.claim_hash) |
5346c35e | 1304 | return 0; |
23721387 | 1305 | |
807736f6 SE |
1306 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1307 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1308 | |
807736f6 | 1309 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1310 | return -ENOMEM; |
23721387 | 1311 | |
807736f6 | 1312 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1313 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1314 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1315 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1316 | |
39c75a51 | 1317 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1318 | |
72414442 AQ |
1319 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1320 | ||
1321 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1322 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1323 | return 0; |
23721387 SW |
1324 | } |
1325 | ||
2c53040f BH |
1326 | /** |
1327 | * batadv_bla_check_bcast_duplist | |
1328 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1329 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1330 | * |
1331 | * check if it is on our broadcast list. Another gateway might | |
1332 | * have sent the same packet because it is connected to the same backbone, | |
1333 | * so we have to remove this duplicate. | |
1334 | * | |
1335 | * This is performed by checking the CRC, which will tell us | |
1336 | * with a good chance that it is the same packet. If it is furthermore | |
1337 | * sent by another host, drop it. We allow equal packets from | |
1338 | * the same host however as this might be intended. | |
9cfc7bd6 | 1339 | */ |
56303d34 | 1340 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1341 | struct sk_buff *skb) |
fe2da6ff | 1342 | { |
004e86fc SW |
1343 | int i, curr, ret = 0; |
1344 | __be32 crc; | |
1345 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1346 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1347 | |
004e86fc | 1348 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1349 | |
1350 | /* calculate the crc ... */ | |
004e86fc | 1351 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1352 | |
7dac7b76 LL |
1353 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1354 | ||
42d0b044 | 1355 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1356 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1357 | curr %= BATADV_DUPLIST_SIZE; | |
1358 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1359 | |
1360 | /* we can stop searching if the entry is too old ; | |
1361 | * later entries will be even older | |
1362 | */ | |
42d0b044 SE |
1363 | if (batadv_has_timed_out(entry->entrytime, |
1364 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1365 | break; |
1366 | ||
1367 | if (entry->crc != crc) | |
1368 | continue; | |
1369 | ||
1eda58bf | 1370 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1371 | continue; |
1372 | ||
1373 | /* this entry seems to match: same crc, not too old, | |
1374 | * and from another gw. therefore return 1 to forbid it. | |
1375 | */ | |
7dac7b76 LL |
1376 | ret = 1; |
1377 | goto out; | |
fe2da6ff | 1378 | } |
7dac7b76 | 1379 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1380 | * and allow it, its the first occurrence. |
7dac7b76 | 1381 | */ |
807736f6 | 1382 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1383 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1384 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1385 | entry->crc = crc; |
1386 | entry->entrytime = jiffies; | |
8fdd0153 | 1387 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1388 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1389 | |
7dac7b76 LL |
1390 | out: |
1391 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1392 | ||
1393 | return ret; | |
fe2da6ff SW |
1394 | } |
1395 | ||
1b371d13 SW |
1396 | /** |
1397 | * batadv_bla_is_backbone_gw_orig | |
1398 | * @bat_priv: the bat priv with all the soft interface information | |
20ff9d59 | 1399 | * @orig: originator mac address |
cfd4f757 | 1400 | * @vid: VLAN identifier |
20ff9d59 | 1401 | * |
cfd4f757 | 1402 | * Check if the originator is a gateway for the VLAN identified by vid. |
20ff9d59 | 1403 | * |
cfd4f757 | 1404 | * Returns true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1405 | */ |
6b5e971a | 1406 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1407 | unsigned short vid) |
20ff9d59 | 1408 | { |
807736f6 | 1409 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1410 | struct hlist_head *head; |
bae98774 | 1411 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1412 | int i; |
1413 | ||
1414 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1415 | return false; |
20ff9d59 SW |
1416 | |
1417 | if (!hash) | |
cfd4f757 | 1418 | return false; |
20ff9d59 SW |
1419 | |
1420 | for (i = 0; i < hash->size; i++) { | |
1421 | head = &hash->table[i]; | |
1422 | ||
1423 | rcu_read_lock(); | |
b67bfe0d | 1424 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1425 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1426 | backbone_gw->vid == vid) { | |
20ff9d59 | 1427 | rcu_read_unlock(); |
cfd4f757 | 1428 | return true; |
20ff9d59 SW |
1429 | } |
1430 | } | |
1431 | rcu_read_unlock(); | |
1432 | } | |
1433 | ||
cfd4f757 | 1434 | return false; |
20ff9d59 SW |
1435 | } |
1436 | ||
2c53040f BH |
1437 | /** |
1438 | * batadv_bla_is_backbone_gw | |
1439 | * @skb: the frame to be checked | |
23721387 SW |
1440 | * @orig_node: the orig_node of the frame |
1441 | * @hdr_size: maximum length of the frame | |
1442 | * | |
1443 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1444 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1445 | * returns 0. | |
23721387 | 1446 | */ |
08adf151 | 1447 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1448 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1449 | { |
bae98774 | 1450 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1451 | unsigned short vid; |
23721387 SW |
1452 | |
1453 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1454 | return 0; | |
1455 | ||
1456 | /* first, find out the vid. */ | |
0d125074 | 1457 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1458 | return 0; |
1459 | ||
c018ad3d | 1460 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1461 | |
1462 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1463 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1464 | orig_node->orig, vid); | |
23721387 SW |
1465 | if (!backbone_gw) |
1466 | return 0; | |
1467 | ||
3b300de3 | 1468 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1469 | return 1; |
1470 | } | |
1471 | ||
1472 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1473 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1474 | { |
56303d34 | 1475 | struct batadv_hard_iface *primary_if; |
23721387 | 1476 | |
807736f6 | 1477 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1478 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1479 | |
807736f6 | 1480 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1481 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1482 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1483 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1484 | } |
807736f6 | 1485 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1486 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1487 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1488 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1489 | } |
1490 | if (primary_if) | |
e5d89254 | 1491 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1492 | } |
1493 | ||
2c53040f BH |
1494 | /** |
1495 | * batadv_bla_rx | |
1496 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1497 | * @skb: the frame to be checked |
1498 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1499 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1500 | * |
1501 | * bla_rx avoidance checks if: | |
1502 | * * we have to race for a claim | |
1503 | * * if the frame is allowed on the LAN | |
1504 | * | |
1505 | * in these cases, the skb is further handled by this function and | |
1506 | * returns 1, otherwise it returns 0 and the caller shall further | |
1507 | * process the skb. | |
23721387 | 1508 | */ |
eb2deb6b AQ |
1509 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1510 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1511 | { |
1512 | struct ethhdr *ethhdr; | |
712bbfe4 | 1513 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1514 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1515 | int ret; |
1516 | ||
7ed4be95 | 1517 | ethhdr = eth_hdr(skb); |
23721387 | 1518 | |
e5d89254 | 1519 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1520 | if (!primary_if) |
1521 | goto handled; | |
1522 | ||
1523 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1524 | goto allow; | |
1525 | ||
807736f6 | 1526 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1527 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1528 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1529 | goto handled; |
1530 | ||
8fdd0153 | 1531 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1532 | search_claim.vid = vid; |
3b300de3 | 1533 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1534 | |
1535 | if (!claim) { | |
1536 | /* possible optimization: race for a claim */ | |
1537 | /* No claim exists yet, claim it for us! | |
1538 | */ | |
3b300de3 SE |
1539 | batadv_handle_claim(bat_priv, primary_if, |
1540 | primary_if->net_dev->dev_addr, | |
1541 | ethhdr->h_source, vid); | |
23721387 SW |
1542 | goto allow; |
1543 | } | |
1544 | ||
1545 | /* if it is our own claim ... */ | |
1eda58bf SE |
1546 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1547 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1548 | /* ... allow it in any case */ |
1549 | claim->lasttime = jiffies; | |
1550 | goto allow; | |
1551 | } | |
1552 | ||
1553 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1554 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1555 | /* ... drop it. the responsible gateway is in charge. | |
1556 | * | |
1557 | * We need to check is_bcast because with the gateway | |
1558 | * feature, broadcasts (like DHCP requests) may be sent | |
1559 | * using a unicast packet type. | |
1560 | */ | |
23721387 SW |
1561 | goto handled; |
1562 | } else { | |
1563 | /* seems the client considers us as its best gateway. | |
1564 | * send a claim and update the claim table | |
1565 | * immediately. | |
1566 | */ | |
3b300de3 SE |
1567 | batadv_handle_claim(bat_priv, primary_if, |
1568 | primary_if->net_dev->dev_addr, | |
1569 | ethhdr->h_source, vid); | |
23721387 SW |
1570 | goto allow; |
1571 | } | |
1572 | allow: | |
3b300de3 | 1573 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1574 | ret = 0; |
1575 | goto out; | |
1576 | ||
1577 | handled: | |
1578 | kfree_skb(skb); | |
1579 | ret = 1; | |
1580 | ||
1581 | out: | |
1582 | if (primary_if) | |
e5d89254 | 1583 | batadv_hardif_free_ref(primary_if); |
23721387 | 1584 | if (claim) |
3b300de3 | 1585 | batadv_claim_free_ref(claim); |
23721387 SW |
1586 | return ret; |
1587 | } | |
1588 | ||
2c53040f BH |
1589 | /** |
1590 | * batadv_bla_tx | |
1591 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1592 | * @skb: the frame to be checked |
1593 | * @vid: the VLAN ID of the frame | |
1594 | * | |
1595 | * bla_tx checks if: | |
1596 | * * a claim was received which has to be processed | |
1597 | * * the frame is allowed on the mesh | |
1598 | * | |
1599 | * in these cases, the skb is further handled by this function and | |
1600 | * returns 1, otherwise it returns 0 and the caller shall further | |
1601 | * process the skb. | |
9d2c9488 LL |
1602 | * |
1603 | * This call might reallocate skb data. | |
23721387 | 1604 | */ |
eb2deb6b AQ |
1605 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1606 | unsigned short vid) | |
23721387 SW |
1607 | { |
1608 | struct ethhdr *ethhdr; | |
712bbfe4 | 1609 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1610 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1611 | int ret = 0; |
1612 | ||
e5d89254 | 1613 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1614 | if (!primary_if) |
1615 | goto out; | |
1616 | ||
1617 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1618 | goto allow; | |
1619 | ||
3b300de3 | 1620 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1621 | goto handled; |
1622 | ||
7ed4be95 | 1623 | ethhdr = eth_hdr(skb); |
23721387 | 1624 | |
807736f6 | 1625 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1626 | /* don't allow broadcasts while requests are in flight */ |
1627 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1628 | goto handled; | |
1629 | ||
8fdd0153 | 1630 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1631 | search_claim.vid = vid; |
1632 | ||
3b300de3 | 1633 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1634 | |
1635 | /* if no claim exists, allow it. */ | |
1636 | if (!claim) | |
1637 | goto allow; | |
1638 | ||
1639 | /* check if we are responsible. */ | |
1eda58bf SE |
1640 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1641 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1642 | /* if yes, the client has roamed and we have |
1643 | * to unclaim it. | |
1644 | */ | |
3b300de3 SE |
1645 | batadv_handle_unclaim(bat_priv, primary_if, |
1646 | primary_if->net_dev->dev_addr, | |
1647 | ethhdr->h_source, vid); | |
23721387 SW |
1648 | goto allow; |
1649 | } | |
1650 | ||
1651 | /* check if it is a multicast/broadcast frame */ | |
1652 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1653 | /* drop it. the responsible gateway has forwarded it into | |
1654 | * the backbone network. | |
1655 | */ | |
1656 | goto handled; | |
1657 | } else { | |
1658 | /* we must allow it. at least if we are | |
1659 | * responsible for the DESTINATION. | |
1660 | */ | |
1661 | goto allow; | |
1662 | } | |
1663 | allow: | |
3b300de3 | 1664 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1665 | ret = 0; |
1666 | goto out; | |
1667 | handled: | |
1668 | ret = 1; | |
1669 | out: | |
1670 | if (primary_if) | |
e5d89254 | 1671 | batadv_hardif_free_ref(primary_if); |
23721387 | 1672 | if (claim) |
3b300de3 | 1673 | batadv_claim_free_ref(claim); |
23721387 SW |
1674 | return ret; |
1675 | } | |
9bf8e4d4 | 1676 | |
08adf151 | 1677 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1678 | { |
1679 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1680 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1681 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1682 | struct batadv_bla_claim *claim; |
56303d34 | 1683 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 1684 | struct hlist_head *head; |
5a1dd8a4 | 1685 | u16 backbone_crc; |
6b5e971a | 1686 | u32 i; |
9bf8e4d4 | 1687 | bool is_own; |
6b5e971a | 1688 | u8 *primary_addr; |
9bf8e4d4 | 1689 | |
30da63a6 ML |
1690 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1691 | if (!primary_if) | |
9bf8e4d4 | 1692 | goto out; |
9bf8e4d4 | 1693 | |
1eda58bf | 1694 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1695 | seq_printf(seq, |
39a32991 | 1696 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1697 | net_dev->name, primary_addr, |
807736f6 | 1698 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1699 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1700 | "Client", "VID", "Originator", "CRC"); |
1701 | for (i = 0; i < hash->size; i++) { | |
1702 | head = &hash->table[i]; | |
1703 | ||
1704 | rcu_read_lock(); | |
b67bfe0d | 1705 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1706 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1707 | primary_addr); | |
5a1dd8a4 SW |
1708 | |
1709 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
1710 | backbone_crc = claim->backbone_gw->crc; | |
1711 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
eb2deb6b | 1712 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1713 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1714 | claim->backbone_gw->orig, |
1715 | (is_own ? 'x' : ' '), | |
5a1dd8a4 | 1716 | backbone_crc); |
9bf8e4d4 SW |
1717 | } |
1718 | rcu_read_unlock(); | |
1719 | } | |
1720 | out: | |
1721 | if (primary_if) | |
e5d89254 | 1722 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1723 | return 0; |
9bf8e4d4 | 1724 | } |
536a23f1 SW |
1725 | |
1726 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1727 | { | |
1728 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1729 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1730 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1731 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1732 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1733 | struct hlist_head *head; |
1734 | int secs, msecs; | |
5a1dd8a4 | 1735 | u16 backbone_crc; |
6b5e971a | 1736 | u32 i; |
536a23f1 | 1737 | bool is_own; |
6b5e971a | 1738 | u8 *primary_addr; |
536a23f1 | 1739 | |
30da63a6 ML |
1740 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1741 | if (!primary_if) | |
536a23f1 | 1742 | goto out; |
536a23f1 SW |
1743 | |
1744 | primary_addr = primary_if->net_dev->dev_addr; | |
1745 | seq_printf(seq, | |
39a32991 | 1746 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1747 | net_dev->name, primary_addr, |
807736f6 | 1748 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1749 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1750 | "Originator", "VID", "last seen", "CRC"); |
1751 | for (i = 0; i < hash->size; i++) { | |
1752 | head = &hash->table[i]; | |
1753 | ||
1754 | rcu_read_lock(); | |
b67bfe0d | 1755 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1756 | msecs = jiffies_to_msecs(jiffies - |
1757 | backbone_gw->lasttime); | |
1758 | secs = msecs / 1000; | |
1759 | msecs = msecs % 1000; | |
1760 | ||
1761 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1762 | primary_addr); | |
1763 | if (is_own) | |
1764 | continue; | |
1765 | ||
5a1dd8a4 SW |
1766 | spin_lock_bh(&backbone_gw->crc_lock); |
1767 | backbone_crc = backbone_gw->crc; | |
1768 | spin_unlock_bh(&backbone_gw->crc_lock); | |
1769 | ||
eb2deb6b | 1770 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1771 | backbone_gw->orig, |
1772 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 1773 | msecs, backbone_crc); |
536a23f1 SW |
1774 | } |
1775 | rcu_read_unlock(); | |
1776 | } | |
1777 | out: | |
1778 | if (primary_if) | |
1779 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1780 | return 0; |
536a23f1 | 1781 | } |