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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 */ | |
63b39927 | 130 | static void batadv_claim_release(struct batadv_bla_claim *claim) |
23721387 | 131 | { |
3b300de3 | 132 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
63b39927 | 133 | kfree_rcu(claim, rcu); |
23721387 SW |
134 | } |
135 | ||
136 | /* free a claim, call claim_free_rcu if its the last reference */ | |
712bbfe4 | 137 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 SW |
138 | { |
139 | if (atomic_dec_and_test(&claim->refcount)) | |
63b39927 | 140 | batadv_claim_release(claim); |
23721387 SW |
141 | } |
142 | ||
1b371d13 SW |
143 | /** |
144 | * batadv_claim_hash_find | |
145 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
146 | * @data: search data (may be local/static data) |
147 | * | |
148 | * looks for a claim in the hash, and returns it if found | |
149 | * or NULL otherwise. | |
150 | */ | |
712bbfe4 ML |
151 | static struct batadv_bla_claim |
152 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
153 | struct batadv_bla_claim *data) | |
23721387 | 154 | { |
807736f6 | 155 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 156 | struct hlist_head *head; |
712bbfe4 ML |
157 | struct batadv_bla_claim *claim; |
158 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
159 | int index; |
160 | ||
161 | if (!hash) | |
162 | return NULL; | |
163 | ||
3b300de3 | 164 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
165 | head = &hash->table[index]; |
166 | ||
167 | rcu_read_lock(); | |
b67bfe0d | 168 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 169 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
170 | continue; |
171 | ||
172 | if (!atomic_inc_not_zero(&claim->refcount)) | |
173 | continue; | |
174 | ||
175 | claim_tmp = claim; | |
176 | break; | |
177 | } | |
178 | rcu_read_unlock(); | |
179 | ||
180 | return claim_tmp; | |
181 | } | |
182 | ||
2c53040f BH |
183 | /** |
184 | * batadv_backbone_hash_find - looks for a claim in the hash | |
185 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
186 | * @addr: the address of the originator |
187 | * @vid: the VLAN ID | |
188 | * | |
2c53040f | 189 | * Returns claim if found or NULL otherwise. |
23721387 | 190 | */ |
bae98774 | 191 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
192 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
193 | unsigned short vid) | |
23721387 | 194 | { |
807736f6 | 195 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 196 | struct hlist_head *head; |
bae98774 ML |
197 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
198 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
199 | int index; |
200 | ||
201 | if (!hash) | |
202 | return NULL; | |
203 | ||
8fdd0153 | 204 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
205 | search_entry.vid = vid; |
206 | ||
3b300de3 | 207 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
208 | head = &hash->table[index]; |
209 | ||
210 | rcu_read_lock(); | |
b67bfe0d | 211 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
212 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
213 | &search_entry)) | |
23721387 SW |
214 | continue; |
215 | ||
216 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
217 | continue; | |
218 | ||
219 | backbone_gw_tmp = backbone_gw; | |
220 | break; | |
221 | } | |
222 | rcu_read_unlock(); | |
223 | ||
224 | return backbone_gw_tmp; | |
225 | } | |
226 | ||
227 | /* delete all claims for a backbone */ | |
56303d34 | 228 | static void |
bae98774 | 229 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 230 | { |
5bf74e9c | 231 | struct batadv_hashtable *hash; |
b67bfe0d | 232 | struct hlist_node *node_tmp; |
23721387 | 233 | struct hlist_head *head; |
712bbfe4 | 234 | struct batadv_bla_claim *claim; |
23721387 SW |
235 | int i; |
236 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
237 | ||
807736f6 | 238 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
239 | if (!hash) |
240 | return; | |
241 | ||
242 | for (i = 0; i < hash->size; i++) { | |
243 | head = &hash->table[i]; | |
244 | list_lock = &hash->list_locks[i]; | |
245 | ||
246 | spin_lock_bh(list_lock); | |
b67bfe0d | 247 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 248 | head, hash_entry) { |
23721387 SW |
249 | if (claim->backbone_gw != backbone_gw) |
250 | continue; | |
251 | ||
3b300de3 | 252 | batadv_claim_free_ref(claim); |
b67bfe0d | 253 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
254 | } |
255 | spin_unlock_bh(list_lock); | |
256 | } | |
257 | ||
3f68785e | 258 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 259 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 260 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 261 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
262 | } |
263 | ||
2c53040f BH |
264 | /** |
265 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
266 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 267 | * @mac: the mac address to be announced within the claim |
23721387 SW |
268 | * @vid: the VLAN ID |
269 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 270 | */ |
6b5e971a | 271 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 272 | unsigned short vid, int claimtype) |
23721387 SW |
273 | { |
274 | struct sk_buff *skb; | |
275 | struct ethhdr *ethhdr; | |
56303d34 | 276 | struct batadv_hard_iface *primary_if; |
23721387 | 277 | struct net_device *soft_iface; |
6b5e971a | 278 | u8 *hw_src; |
96412690 | 279 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 280 | __be32 zeroip = 0; |
23721387 | 281 | |
e5d89254 | 282 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
283 | if (!primary_if) |
284 | return; | |
285 | ||
807736f6 | 286 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 287 | sizeof(local_claim_dest)); |
23721387 SW |
288 | local_claim_dest.type = claimtype; |
289 | ||
290 | soft_iface = primary_if->soft_iface; | |
291 | ||
292 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
293 | /* IP DST: 0.0.0.0 */ | |
294 | zeroip, | |
295 | primary_if->soft_iface, | |
296 | /* IP SRC: 0.0.0.0 */ | |
297 | zeroip, | |
298 | /* Ethernet DST: Broadcast */ | |
299 | NULL, | |
300 | /* Ethernet SRC/HW SRC: originator mac */ | |
301 | primary_if->net_dev->dev_addr, | |
99e966fc | 302 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 303 | * with XX = claim type |
38ef3d1d | 304 | * and YY:YY = group id |
23721387 | 305 | */ |
6b5e971a | 306 | (u8 *)&local_claim_dest); |
23721387 SW |
307 | |
308 | if (!skb) | |
309 | goto out; | |
310 | ||
311 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 312 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
313 | |
314 | /* now we pretend that the client would have sent this ... */ | |
315 | switch (claimtype) { | |
3eb8773e | 316 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
317 | /* normal claim frame |
318 | * set Ethernet SRC to the clients mac | |
319 | */ | |
8fdd0153 | 320 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 321 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
322 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
323 | BATADV_PRINT_VID(vid)); | |
23721387 | 324 | break; |
3eb8773e | 325 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
326 | /* unclaim frame |
327 | * set HW SRC to the clients mac | |
328 | */ | |
8fdd0153 | 329 | ether_addr_copy(hw_src, mac); |
39c75a51 | 330 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 331 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 332 | BATADV_PRINT_VID(vid)); |
23721387 | 333 | break; |
acd34afa | 334 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
335 | /* announcement frame |
336 | * set HW SRC to the special mac containg the crc | |
337 | */ | |
8fdd0153 | 338 | ether_addr_copy(hw_src, mac); |
39c75a51 | 339 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 340 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 341 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 342 | break; |
acd34afa | 343 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 344 | /* request frame |
99e966fc SW |
345 | * set HW SRC and header destination to the receiving backbone |
346 | * gws mac | |
23721387 | 347 | */ |
8fdd0153 AQ |
348 | ether_addr_copy(hw_src, mac); |
349 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 350 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 351 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
352 | ethhdr->h_source, ethhdr->h_dest, |
353 | BATADV_PRINT_VID(vid)); | |
23721387 | 354 | break; |
23721387 SW |
355 | } |
356 | ||
eb2deb6b AQ |
357 | if (vid & BATADV_VLAN_HAS_TAG) |
358 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
359 | vid & VLAN_VID_MASK); | |
23721387 SW |
360 | |
361 | skb_reset_mac_header(skb); | |
362 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
363 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
364 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
365 | skb->len + ETH_HLEN); | |
23721387 SW |
366 | soft_iface->last_rx = jiffies; |
367 | ||
368 | netif_rx(skb); | |
369 | out: | |
370 | if (primary_if) | |
e5d89254 | 371 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
372 | } |
373 | ||
2c53040f BH |
374 | /** |
375 | * batadv_bla_get_backbone_gw | |
376 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
377 | * @orig: the mac address of the originator |
378 | * @vid: the VLAN ID | |
e3357189 | 379 | * @own_backbone: set if the requested backbone is local |
23721387 SW |
380 | * |
381 | * searches for the backbone gw or creates a new one if it could not | |
382 | * be found. | |
383 | */ | |
bae98774 | 384 | static struct batadv_bla_backbone_gw * |
6b5e971a | 385 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 386 | unsigned short vid, bool own_backbone) |
23721387 | 387 | { |
bae98774 | 388 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 389 | struct batadv_orig_node *orig_node; |
23721387 SW |
390 | int hash_added; |
391 | ||
3b300de3 | 392 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
393 | |
394 | if (entry) | |
395 | return entry; | |
396 | ||
39c75a51 | 397 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 398 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 399 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
400 | |
401 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
402 | if (!entry) | |
403 | return NULL; | |
404 | ||
405 | entry->vid = vid; | |
406 | entry->lasttime = jiffies; | |
3964f728 | 407 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 408 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 409 | spin_lock_init(&entry->crc_lock); |
23721387 | 410 | atomic_set(&entry->request_sent, 0); |
28709878 | 411 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 412 | ether_addr_copy(entry->orig, orig); |
23721387 SW |
413 | |
414 | /* one for the hash, one for returning */ | |
415 | atomic_set(&entry->refcount, 2); | |
416 | ||
807736f6 | 417 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
418 | batadv_compare_backbone_gw, |
419 | batadv_choose_backbone_gw, entry, | |
420 | &entry->hash_entry); | |
23721387 SW |
421 | |
422 | if (unlikely(hash_added != 0)) { | |
423 | /* hash failed, free the structure */ | |
424 | kfree(entry); | |
425 | return NULL; | |
426 | } | |
427 | ||
95fb130d | 428 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 429 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 430 | if (orig_node) { |
95fb130d | 431 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 432 | "became a backbone gateway"); |
7d211efc | 433 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 434 | } |
52aebd6a | 435 | |
d807f272 | 436 | if (own_backbone) { |
52aebd6a SW |
437 | batadv_bla_send_announce(bat_priv, entry); |
438 | ||
d807f272 SW |
439 | /* this will be decreased in the worker thread */ |
440 | atomic_inc(&entry->request_sent); | |
28709878 | 441 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
442 | atomic_inc(&bat_priv->bla.num_requests); |
443 | } | |
444 | ||
23721387 SW |
445 | return entry; |
446 | } | |
447 | ||
448 | /* update or add the own backbone gw to make sure we announce | |
449 | * where we receive other backbone gws | |
450 | */ | |
56303d34 SE |
451 | static void |
452 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
453 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 454 | unsigned short vid) |
23721387 | 455 | { |
bae98774 | 456 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 457 | |
3b300de3 SE |
458 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
459 | primary_if->net_dev->dev_addr, | |
52aebd6a | 460 | vid, true); |
23721387 SW |
461 | if (unlikely(!backbone_gw)) |
462 | return; | |
463 | ||
464 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 465 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
466 | } |
467 | ||
1b371d13 SW |
468 | /** |
469 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
470 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 471 | * @primary_if: interface where the request came on |
23721387 SW |
472 | * @vid: the vid where the request came on |
473 | * | |
474 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
475 | * to allow the requester another check if the CRC is correct now. | |
476 | */ | |
56303d34 SE |
477 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
478 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 479 | unsigned short vid) |
23721387 | 480 | { |
23721387 | 481 | struct hlist_head *head; |
5bf74e9c | 482 | struct batadv_hashtable *hash; |
712bbfe4 | 483 | struct batadv_bla_claim *claim; |
bae98774 | 484 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
485 | int i; |
486 | ||
39c75a51 | 487 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 488 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 489 | |
3b300de3 SE |
490 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
491 | primary_if->net_dev->dev_addr, | |
492 | vid); | |
23721387 SW |
493 | if (!backbone_gw) |
494 | return; | |
495 | ||
807736f6 | 496 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
497 | for (i = 0; i < hash->size; i++) { |
498 | head = &hash->table[i]; | |
499 | ||
500 | rcu_read_lock(); | |
b67bfe0d | 501 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
502 | /* only own claims are interesting */ |
503 | if (claim->backbone_gw != backbone_gw) | |
504 | continue; | |
505 | ||
3b300de3 | 506 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 507 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
508 | } |
509 | rcu_read_unlock(); | |
510 | } | |
511 | ||
512 | /* finally, send an announcement frame */ | |
3b300de3 SE |
513 | batadv_bla_send_announce(bat_priv, backbone_gw); |
514 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
515 | } |
516 | ||
1b371d13 SW |
517 | /** |
518 | * batadv_bla_send_request - send a request to repeat claims | |
519 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
520 | * |
521 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
522 | * After the request, it will repeat all of his own claims and finally | |
523 | * send an announcement claim with which we can check again. | |
524 | */ | |
bae98774 | 525 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
526 | { |
527 | /* first, remove all old entries */ | |
3b300de3 | 528 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 529 | |
39c75a51 SE |
530 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
531 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
532 | |
533 | /* send request */ | |
3b300de3 | 534 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 535 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
536 | |
537 | /* no local broadcasts should be sent or received, for now. */ | |
538 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 539 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
540 | atomic_set(&backbone_gw->request_sent, 1); |
541 | } | |
542 | } | |
543 | ||
1b371d13 SW |
544 | /** |
545 | * batadv_bla_send_announce | |
546 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
547 | * @backbone_gw: our backbone gateway which should be announced |
548 | * | |
549 | * This function sends an announcement. It is called from multiple | |
550 | * places. | |
551 | */ | |
56303d34 | 552 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 553 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 554 | { |
6b5e971a | 555 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 556 | __be16 crc; |
23721387 | 557 | |
3b300de3 | 558 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 559 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 560 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 561 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 562 | memcpy(&mac[4], &crc, 2); |
23721387 | 563 | |
3b300de3 | 564 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 565 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
566 | } |
567 | ||
2c53040f BH |
568 | /** |
569 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
570 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
571 | * @mac: the mac address of the claim |
572 | * @vid: the VLAN ID of the frame | |
573 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 574 | */ |
56303d34 | 575 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 576 | const u8 *mac, const unsigned short vid, |
bae98774 | 577 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 578 | { |
712bbfe4 ML |
579 | struct batadv_bla_claim *claim; |
580 | struct batadv_bla_claim search_claim; | |
23721387 SW |
581 | int hash_added; |
582 | ||
8fdd0153 | 583 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 584 | search_claim.vid = vid; |
3b300de3 | 585 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
586 | |
587 | /* create a new claim entry if it does not exist yet. */ | |
588 | if (!claim) { | |
589 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
590 | if (!claim) | |
591 | return; | |
592 | ||
8fdd0153 | 593 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
594 | claim->vid = vid; |
595 | claim->lasttime = jiffies; | |
596 | claim->backbone_gw = backbone_gw; | |
597 | ||
598 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 599 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 600 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 601 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 602 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
603 | batadv_compare_claim, |
604 | batadv_choose_claim, claim, | |
605 | &claim->hash_entry); | |
23721387 SW |
606 | |
607 | if (unlikely(hash_added != 0)) { | |
608 | /* only local changes happened. */ | |
609 | kfree(claim); | |
610 | return; | |
611 | } | |
612 | } else { | |
613 | claim->lasttime = jiffies; | |
614 | if (claim->backbone_gw == backbone_gw) | |
615 | /* no need to register a new backbone */ | |
616 | goto claim_free_ref; | |
617 | ||
39c75a51 | 618 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 619 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 620 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 621 | |
5a1dd8a4 | 622 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
bbb1f90e | 623 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 624 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
3b300de3 | 625 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
626 | } |
627 | /* set (new) backbone gw */ | |
628 | atomic_inc(&backbone_gw->refcount); | |
629 | claim->backbone_gw = backbone_gw; | |
630 | ||
5a1dd8a4 | 631 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 632 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 633 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
634 | backbone_gw->lasttime = jiffies; |
635 | ||
636 | claim_free_ref: | |
3b300de3 | 637 | batadv_claim_free_ref(claim); |
23721387 SW |
638 | } |
639 | ||
640 | /* Delete a claim from the claim hash which has the | |
641 | * given mac address and vid. | |
642 | */ | |
56303d34 | 643 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 644 | const u8 *mac, const unsigned short vid) |
23721387 | 645 | { |
712bbfe4 | 646 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 647 | |
8fdd0153 | 648 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 649 | search_claim.vid = vid; |
3b300de3 | 650 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
651 | if (!claim) |
652 | return; | |
653 | ||
39c75a51 | 654 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 655 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 656 | |
807736f6 | 657 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
658 | batadv_choose_claim, claim); |
659 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 | 660 | |
5a1dd8a4 | 661 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
23721387 | 662 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 663 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
23721387 SW |
664 | |
665 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 666 | batadv_claim_free_ref(claim); |
23721387 SW |
667 | } |
668 | ||
669 | /* check for ANNOUNCE frame, return 1 if handled */ | |
6b5e971a SE |
670 | static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
671 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 672 | { |
bae98774 | 673 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 674 | u16 backbone_crc, crc; |
23721387 | 675 | |
3b300de3 | 676 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
677 | return 0; |
678 | ||
52aebd6a SW |
679 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
680 | false); | |
23721387 SW |
681 | |
682 | if (unlikely(!backbone_gw)) | |
683 | return 1; | |
684 | ||
23721387 SW |
685 | /* handle as ANNOUNCE frame */ |
686 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 687 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 688 | |
39c75a51 | 689 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 690 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 691 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 692 | |
5a1dd8a4 SW |
693 | spin_lock_bh(&backbone_gw->crc_lock); |
694 | backbone_crc = backbone_gw->crc; | |
695 | spin_unlock_bh(&backbone_gw->crc_lock); | |
696 | ||
697 | if (backbone_crc != crc) { | |
39c75a51 | 698 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 699 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
700 | backbone_gw->orig, |
701 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 702 | backbone_crc, crc); |
23721387 | 703 | |
3b300de3 | 704 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
705 | } else { |
706 | /* if we have sent a request and the crc was OK, | |
707 | * we can allow traffic again. | |
708 | */ | |
709 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 710 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
711 | atomic_set(&backbone_gw->request_sent, 0); |
712 | } | |
713 | } | |
714 | ||
3b300de3 | 715 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
716 | return 1; |
717 | } | |
718 | ||
719 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
720 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
721 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
722 | u8 *backbone_addr, struct ethhdr *ethhdr, |
723 | unsigned short vid) | |
23721387 SW |
724 | { |
725 | /* check for REQUEST frame */ | |
1eda58bf | 726 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
727 | return 0; |
728 | ||
729 | /* sanity check, this should not happen on a normal switch, | |
730 | * we ignore it in this case. | |
731 | */ | |
1eda58bf | 732 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
733 | return 1; |
734 | ||
39c75a51 | 735 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 736 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 737 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 738 | |
3b300de3 | 739 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
740 | return 1; |
741 | } | |
742 | ||
743 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
744 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
745 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
746 | u8 *backbone_addr, u8 *claim_addr, |
747 | unsigned short vid) | |
23721387 | 748 | { |
bae98774 | 749 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
750 | |
751 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
752 | if (primary_if && batadv_compare_eth(backbone_addr, |
753 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 754 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 755 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 756 | |
3b300de3 | 757 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
758 | |
759 | if (!backbone_gw) | |
760 | return 1; | |
761 | ||
762 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 763 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 764 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 765 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 766 | |
3b300de3 SE |
767 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
768 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
769 | return 1; |
770 | } | |
771 | ||
772 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
773 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
774 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 775 | u8 *backbone_addr, u8 *claim_addr, |
eb2deb6b | 776 | unsigned short vid) |
23721387 | 777 | { |
bae98774 | 778 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
779 | |
780 | /* register the gateway if not yet available, and add the claim. */ | |
781 | ||
52aebd6a SW |
782 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
783 | false); | |
23721387 SW |
784 | |
785 | if (unlikely(!backbone_gw)) | |
786 | return 1; | |
787 | ||
788 | /* this must be a CLAIM frame */ | |
3b300de3 | 789 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 790 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 791 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 792 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
793 | |
794 | /* TODO: we could call something like tt_local_del() here. */ | |
795 | ||
3b300de3 | 796 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
797 | return 1; |
798 | } | |
799 | ||
2c53040f BH |
800 | /** |
801 | * batadv_check_claim_group | |
802 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 803 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
804 | * @hw_src: the Hardware source in the ARP Header |
805 | * @hw_dst: the Hardware destination in the ARP Header | |
806 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
807 | * | |
808 | * checks if it is a claim packet and if its on the same group. | |
809 | * This function also applies the group ID of the sender | |
810 | * if it is in the same mesh. | |
811 | * | |
812 | * returns: | |
813 | * 2 - if it is a claim packet and on the same group | |
814 | * 1 - if is a claim packet from another group | |
815 | * 0 - if it is not a claim packet | |
816 | */ | |
56303d34 SE |
817 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
818 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 819 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 820 | struct ethhdr *ethhdr) |
38ef3d1d | 821 | { |
6b5e971a | 822 | u8 *backbone_addr; |
56303d34 | 823 | struct batadv_orig_node *orig_node; |
96412690 | 824 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 825 | |
96412690 | 826 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 827 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 828 | |
38ef3d1d SW |
829 | /* if announcement packet, use the source, |
830 | * otherwise assume it is in the hw_src | |
831 | */ | |
832 | switch (bla_dst->type) { | |
3eb8773e | 833 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
834 | backbone_addr = hw_src; |
835 | break; | |
acd34afa SE |
836 | case BATADV_CLAIM_TYPE_REQUEST: |
837 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 838 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
839 | backbone_addr = ethhdr->h_source; |
840 | break; | |
841 | default: | |
842 | return 0; | |
843 | } | |
844 | ||
845 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 846 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
847 | return 0; |
848 | ||
849 | /* if its already the same group, it is fine. */ | |
850 | if (bla_dst->group == bla_dst_own->group) | |
851 | return 2; | |
852 | ||
853 | /* lets see if this originator is in our mesh */ | |
da641193 | 854 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
855 | |
856 | /* dont accept claims from gateways which are not in | |
857 | * the same mesh or group. | |
858 | */ | |
859 | if (!orig_node) | |
860 | return 1; | |
861 | ||
862 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
863 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 864 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 865 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 866 | ntohs(bla_dst->group)); |
38ef3d1d SW |
867 | bla_dst_own->group = bla_dst->group; |
868 | } | |
869 | ||
7d211efc | 870 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
871 | |
872 | return 2; | |
873 | } | |
874 | ||
1b371d13 SW |
875 | /** |
876 | * batadv_bla_process_claim | |
877 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 878 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
879 | * @skb: the frame to be checked |
880 | * | |
881 | * Check if this is a claim frame, and process it accordingly. | |
882 | * | |
883 | * returns 1 if it was a claim frame, otherwise return 0 to | |
884 | * tell the callee that it can use the frame on its own. | |
885 | */ | |
56303d34 SE |
886 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
887 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 888 | struct sk_buff *skb) |
23721387 | 889 | { |
d46b6bfa | 890 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 891 | u8 *hw_src, *hw_dst; |
d46b6bfa | 892 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 893 | struct ethhdr *ethhdr; |
23721387 | 894 | struct arphdr *arphdr; |
c018ad3d | 895 | unsigned short vid; |
d46b6bfa | 896 | int vlan_depth = 0; |
293e9338 | 897 | __be16 proto; |
23721387 | 898 | int headlen; |
38ef3d1d | 899 | int ret; |
23721387 | 900 | |
c018ad3d | 901 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 902 | ethhdr = eth_hdr(skb); |
23721387 | 903 | |
c018ad3d AQ |
904 | proto = ethhdr->h_proto; |
905 | headlen = ETH_HLEN; | |
906 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
907 | /* Traverse the VLAN/Ethertypes. |
908 | * | |
909 | * At this point it is known that the first protocol is a VLAN | |
910 | * header, so start checking at the encapsulated protocol. | |
911 | * | |
912 | * The depth of the VLAN headers is recorded to drop BLA claim | |
913 | * frames encapsulated into multiple VLAN headers (QinQ). | |
914 | */ | |
915 | do { | |
916 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
917 | &vhdr_buf); | |
918 | if (!vhdr) | |
919 | return 0; | |
920 | ||
921 | proto = vhdr->h_vlan_encapsulated_proto; | |
922 | headlen += VLAN_HLEN; | |
923 | vlan_depth++; | |
924 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
925 | } |
926 | ||
293e9338 | 927 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
928 | return 0; /* not a claim frame */ |
929 | ||
930 | /* this must be a ARP frame. check if it is a claim. */ | |
931 | ||
932 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
933 | return 0; | |
934 | ||
935 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 936 | ethhdr = eth_hdr(skb); |
6b5e971a | 937 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
938 | |
939 | /* Check whether the ARP frame carries a valid | |
940 | * IP information | |
941 | */ | |
23721387 SW |
942 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
943 | return 0; | |
944 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
945 | return 0; | |
946 | if (arphdr->ar_hln != ETH_ALEN) | |
947 | return 0; | |
948 | if (arphdr->ar_pln != 4) | |
949 | return 0; | |
950 | ||
6b5e971a | 951 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 952 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 953 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
954 | bla_dst_own = &bat_priv->bla.claim_dest; |
955 | ||
956 | /* check if it is a claim frame in general */ | |
957 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
958 | sizeof(bla_dst->magic)) != 0) | |
959 | return 0; | |
960 | ||
961 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
962 | * drop that, as this is not supported by BLA but should also not be | |
963 | * sent via the mesh. | |
964 | */ | |
965 | if (vlan_depth > 1) | |
966 | return 1; | |
23721387 SW |
967 | |
968 | /* check if it is a claim frame. */ | |
3b300de3 SE |
969 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
970 | ethhdr); | |
38ef3d1d | 971 | if (ret == 1) |
39c75a51 | 972 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 973 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
974 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
975 | hw_dst); | |
38ef3d1d SW |
976 | |
977 | if (ret < 2) | |
978 | return ret; | |
23721387 SW |
979 | |
980 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 981 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
982 | |
983 | /* check for the different types of claim frames ... */ | |
984 | switch (bla_dst->type) { | |
3eb8773e | 985 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
986 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
987 | ethhdr->h_source, vid)) | |
23721387 SW |
988 | return 1; |
989 | break; | |
3eb8773e | 990 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
991 | if (batadv_handle_unclaim(bat_priv, primary_if, |
992 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
993 | return 1; |
994 | break; | |
995 | ||
acd34afa | 996 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
997 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
998 | vid)) | |
23721387 SW |
999 | return 1; |
1000 | break; | |
acd34afa | 1001 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1002 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1003 | vid)) | |
23721387 SW |
1004 | return 1; |
1005 | break; | |
1006 | } | |
1007 | ||
39c75a51 | 1008 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1009 | "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 | 1010 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
1011 | return 1; |
1012 | } | |
1013 | ||
1014 | /* Check when we last heard from other nodes, and remove them in case of | |
1015 | * a time out, or clean all backbone gws if now is set. | |
1016 | */ | |
56303d34 | 1017 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1018 | { |
bae98774 | 1019 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1020 | struct hlist_node *node_tmp; |
23721387 | 1021 | struct hlist_head *head; |
5bf74e9c | 1022 | struct batadv_hashtable *hash; |
23721387 SW |
1023 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1024 | int i; | |
1025 | ||
807736f6 | 1026 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1027 | if (!hash) |
1028 | return; | |
1029 | ||
1030 | for (i = 0; i < hash->size; i++) { | |
1031 | head = &hash->table[i]; | |
1032 | list_lock = &hash->list_locks[i]; | |
1033 | ||
1034 | spin_lock_bh(list_lock); | |
b67bfe0d | 1035 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1036 | head, hash_entry) { |
1037 | if (now) | |
1038 | goto purge_now; | |
1eda58bf | 1039 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1040 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1041 | continue; |
1042 | ||
39c75a51 | 1043 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1044 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1045 | backbone_gw->orig); | |
23721387 SW |
1046 | |
1047 | purge_now: | |
1048 | /* don't wait for the pending request anymore */ | |
1049 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1050 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1051 | |
3b300de3 | 1052 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1053 | |
b67bfe0d | 1054 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1055 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1056 | } |
1057 | spin_unlock_bh(list_lock); | |
1058 | } | |
1059 | } | |
1060 | ||
2c53040f BH |
1061 | /** |
1062 | * batadv_bla_purge_claims | |
1063 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1064 | * @primary_if: the selected primary interface, may be NULL if now is set |
1065 | * @now: whether the whole hash shall be wiped now | |
1066 | * | |
1067 | * Check when we heard last time from our own claims, and remove them in case of | |
1068 | * a time out, or clean all claims if now is set | |
1069 | */ | |
56303d34 SE |
1070 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1071 | struct batadv_hard_iface *primary_if, | |
1072 | int now) | |
23721387 | 1073 | { |
712bbfe4 | 1074 | struct batadv_bla_claim *claim; |
23721387 | 1075 | struct hlist_head *head; |
5bf74e9c | 1076 | struct batadv_hashtable *hash; |
23721387 SW |
1077 | int i; |
1078 | ||
807736f6 | 1079 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1080 | if (!hash) |
1081 | return; | |
1082 | ||
1083 | for (i = 0; i < hash->size; i++) { | |
1084 | head = &hash->table[i]; | |
1085 | ||
1086 | rcu_read_lock(); | |
b67bfe0d | 1087 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1088 | if (now) |
1089 | goto purge_now; | |
1eda58bf SE |
1090 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1091 | primary_if->net_dev->dev_addr)) | |
23721387 | 1092 | continue; |
1eda58bf | 1093 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1094 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1095 | continue; |
1096 | ||
39c75a51 | 1097 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1098 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1099 | claim->addr, claim->vid); | |
23721387 SW |
1100 | |
1101 | purge_now: | |
3b300de3 SE |
1102 | batadv_handle_unclaim(bat_priv, primary_if, |
1103 | claim->backbone_gw->orig, | |
1104 | claim->addr, claim->vid); | |
23721387 SW |
1105 | } |
1106 | rcu_read_unlock(); | |
1107 | } | |
1108 | } | |
1109 | ||
2c53040f BH |
1110 | /** |
1111 | * batadv_bla_update_orig_address | |
1112 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1113 | * @primary_if: the new selected primary_if |
1114 | * @oldif: the old primary interface, may be NULL | |
1115 | * | |
1116 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1117 | */ |
56303d34 SE |
1118 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1119 | struct batadv_hard_iface *primary_if, | |
1120 | struct batadv_hard_iface *oldif) | |
23721387 | 1121 | { |
bae98774 | 1122 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1123 | struct hlist_head *head; |
5bf74e9c | 1124 | struct batadv_hashtable *hash; |
807736f6 | 1125 | __be16 group; |
23721387 SW |
1126 | int i; |
1127 | ||
38ef3d1d | 1128 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1129 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1130 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1131 | |
d5b4c93e SW |
1132 | /* purge everything when bridge loop avoidance is turned off */ |
1133 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1134 | oldif = NULL; | |
1135 | ||
23721387 | 1136 | if (!oldif) { |
3b300de3 SE |
1137 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1138 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1139 | return; |
1140 | } | |
1141 | ||
807736f6 | 1142 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1143 | if (!hash) |
1144 | return; | |
1145 | ||
1146 | for (i = 0; i < hash->size; i++) { | |
1147 | head = &hash->table[i]; | |
1148 | ||
1149 | rcu_read_lock(); | |
b67bfe0d | 1150 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1151 | /* own orig still holds the old value. */ |
1eda58bf SE |
1152 | if (!batadv_compare_eth(backbone_gw->orig, |
1153 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1154 | continue; |
1155 | ||
8fdd0153 AQ |
1156 | ether_addr_copy(backbone_gw->orig, |
1157 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1158 | /* send an announce frame so others will ask for our |
1159 | * claims and update their tables. | |
1160 | */ | |
3b300de3 | 1161 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1162 | } |
1163 | rcu_read_unlock(); | |
1164 | } | |
1165 | } | |
1166 | ||
d68081a2 SW |
1167 | /** |
1168 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1169 | * @net_dev: the soft interface net device | |
1170 | */ | |
1171 | void batadv_bla_status_update(struct net_device *net_dev) | |
1172 | { | |
1173 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1174 | struct batadv_hard_iface *primary_if; | |
1175 | ||
1176 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1177 | if (!primary_if) | |
1178 | return; | |
1179 | ||
1180 | /* this function already purges everything when bla is disabled, | |
1181 | * so just call that one. | |
1182 | */ | |
1183 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
1184 | batadv_hardif_free_ref(primary_if); | |
1185 | } | |
1186 | ||
23721387 SW |
1187 | /* periodic work to do: |
1188 | * * purge structures when they are too old | |
1189 | * * send announcements | |
1190 | */ | |
3b300de3 | 1191 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1192 | { |
bbb1f90e | 1193 | struct delayed_work *delayed_work; |
56303d34 | 1194 | struct batadv_priv *bat_priv; |
807736f6 | 1195 | struct batadv_priv_bla *priv_bla; |
23721387 | 1196 | struct hlist_head *head; |
bae98774 | 1197 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1198 | struct batadv_hashtable *hash; |
56303d34 | 1199 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1200 | int i; |
1201 | ||
bbb1f90e | 1202 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1203 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1204 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1205 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1206 | if (!primary_if) |
1207 | goto out; | |
1208 | ||
3b300de3 SE |
1209 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1210 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1211 | |
1212 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1213 | goto out; | |
1214 | ||
807736f6 | 1215 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1216 | if (!hash) |
1217 | goto out; | |
1218 | ||
1219 | for (i = 0; i < hash->size; i++) { | |
1220 | head = &hash->table[i]; | |
1221 | ||
1222 | rcu_read_lock(); | |
b67bfe0d | 1223 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1224 | if (!batadv_compare_eth(backbone_gw->orig, |
1225 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1226 | continue; |
1227 | ||
1228 | backbone_gw->lasttime = jiffies; | |
1229 | ||
3b300de3 | 1230 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1231 | |
1232 | /* request_sent is only set after creation to avoid | |
1233 | * problems when we are not yet known as backbone gw | |
1234 | * in the backbone. | |
1235 | * | |
28709878 SW |
1236 | * We can reset this now after we waited some periods |
1237 | * to give bridge forward delays and bla group forming | |
1238 | * some grace time. | |
d807f272 SW |
1239 | */ |
1240 | ||
1241 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1242 | continue; | |
1243 | ||
28709878 SW |
1244 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1245 | continue; | |
1246 | ||
d807f272 SW |
1247 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1248 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1249 | } |
1250 | rcu_read_unlock(); | |
1251 | } | |
1252 | out: | |
1253 | if (primary_if) | |
e5d89254 | 1254 | batadv_hardif_free_ref(primary_if); |
23721387 | 1255 | |
72414442 AQ |
1256 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1257 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1258 | } |
1259 | ||
5d52dad2 SE |
1260 | /* The hash for claim and backbone hash receive the same key because they |
1261 | * are getting initialized by hash_new with the same key. Reinitializing | |
1262 | * them with to different keys to allow nested locking without generating | |
1263 | * lockdep warnings | |
1264 | */ | |
3b300de3 SE |
1265 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1266 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1267 | |
23721387 | 1268 | /* initialize all bla structures */ |
56303d34 | 1269 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1270 | { |
fe2da6ff | 1271 | int i; |
6b5e971a | 1272 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1273 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1274 | u16 crc; |
807736f6 | 1275 | unsigned long entrytime; |
fe2da6ff | 1276 | |
7dac7b76 LL |
1277 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1278 | ||
39c75a51 | 1279 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1280 | |
38ef3d1d | 1281 | /* setting claim destination address */ |
807736f6 SE |
1282 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1283 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1284 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1285 | if (primary_if) { |
807736f6 SE |
1286 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1287 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1288 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1289 | } else { |
807736f6 | 1290 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1291 | } |
1292 | ||
fe2da6ff | 1293 | /* initialize the duplicate list */ |
807736f6 | 1294 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1295 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1296 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1297 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1298 | |
807736f6 | 1299 | if (bat_priv->bla.claim_hash) |
5346c35e | 1300 | return 0; |
23721387 | 1301 | |
807736f6 SE |
1302 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1303 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1304 | |
807736f6 | 1305 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1306 | return -ENOMEM; |
23721387 | 1307 | |
807736f6 | 1308 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1309 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1310 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1311 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1312 | |
39c75a51 | 1313 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1314 | |
72414442 AQ |
1315 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1316 | ||
1317 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1318 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1319 | return 0; |
23721387 SW |
1320 | } |
1321 | ||
2c53040f BH |
1322 | /** |
1323 | * batadv_bla_check_bcast_duplist | |
1324 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1325 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1326 | * |
1327 | * check if it is on our broadcast list. Another gateway might | |
1328 | * have sent the same packet because it is connected to the same backbone, | |
1329 | * so we have to remove this duplicate. | |
1330 | * | |
1331 | * This is performed by checking the CRC, which will tell us | |
1332 | * with a good chance that it is the same packet. If it is furthermore | |
1333 | * sent by another host, drop it. We allow equal packets from | |
1334 | * the same host however as this might be intended. | |
9cfc7bd6 | 1335 | */ |
56303d34 | 1336 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1337 | struct sk_buff *skb) |
fe2da6ff | 1338 | { |
004e86fc SW |
1339 | int i, curr, ret = 0; |
1340 | __be32 crc; | |
1341 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1342 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1343 | |
004e86fc | 1344 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1345 | |
1346 | /* calculate the crc ... */ | |
004e86fc | 1347 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1348 | |
7dac7b76 LL |
1349 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1350 | ||
42d0b044 | 1351 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1352 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1353 | curr %= BATADV_DUPLIST_SIZE; | |
1354 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1355 | |
1356 | /* we can stop searching if the entry is too old ; | |
1357 | * later entries will be even older | |
1358 | */ | |
42d0b044 SE |
1359 | if (batadv_has_timed_out(entry->entrytime, |
1360 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1361 | break; |
1362 | ||
1363 | if (entry->crc != crc) | |
1364 | continue; | |
1365 | ||
1eda58bf | 1366 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1367 | continue; |
1368 | ||
1369 | /* this entry seems to match: same crc, not too old, | |
1370 | * and from another gw. therefore return 1 to forbid it. | |
1371 | */ | |
7dac7b76 LL |
1372 | ret = 1; |
1373 | goto out; | |
fe2da6ff | 1374 | } |
7dac7b76 | 1375 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1376 | * and allow it, its the first occurrence. |
7dac7b76 | 1377 | */ |
807736f6 | 1378 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1379 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1380 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1381 | entry->crc = crc; |
1382 | entry->entrytime = jiffies; | |
8fdd0153 | 1383 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1384 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1385 | |
7dac7b76 LL |
1386 | out: |
1387 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1388 | ||
1389 | return ret; | |
fe2da6ff SW |
1390 | } |
1391 | ||
1b371d13 SW |
1392 | /** |
1393 | * batadv_bla_is_backbone_gw_orig | |
1394 | * @bat_priv: the bat priv with all the soft interface information | |
20ff9d59 | 1395 | * @orig: originator mac address |
cfd4f757 | 1396 | * @vid: VLAN identifier |
20ff9d59 | 1397 | * |
cfd4f757 | 1398 | * Check if the originator is a gateway for the VLAN identified by vid. |
20ff9d59 | 1399 | * |
cfd4f757 | 1400 | * Returns true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1401 | */ |
6b5e971a | 1402 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1403 | unsigned short vid) |
20ff9d59 | 1404 | { |
807736f6 | 1405 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1406 | struct hlist_head *head; |
bae98774 | 1407 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1408 | int i; |
1409 | ||
1410 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1411 | return false; |
20ff9d59 SW |
1412 | |
1413 | if (!hash) | |
cfd4f757 | 1414 | return false; |
20ff9d59 SW |
1415 | |
1416 | for (i = 0; i < hash->size; i++) { | |
1417 | head = &hash->table[i]; | |
1418 | ||
1419 | rcu_read_lock(); | |
b67bfe0d | 1420 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1421 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1422 | backbone_gw->vid == vid) { | |
20ff9d59 | 1423 | rcu_read_unlock(); |
cfd4f757 | 1424 | return true; |
20ff9d59 SW |
1425 | } |
1426 | } | |
1427 | rcu_read_unlock(); | |
1428 | } | |
1429 | ||
cfd4f757 | 1430 | return false; |
20ff9d59 SW |
1431 | } |
1432 | ||
2c53040f BH |
1433 | /** |
1434 | * batadv_bla_is_backbone_gw | |
1435 | * @skb: the frame to be checked | |
23721387 SW |
1436 | * @orig_node: the orig_node of the frame |
1437 | * @hdr_size: maximum length of the frame | |
1438 | * | |
1439 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1440 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1441 | * returns 0. | |
23721387 | 1442 | */ |
08adf151 | 1443 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1444 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1445 | { |
bae98774 | 1446 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1447 | unsigned short vid; |
23721387 SW |
1448 | |
1449 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1450 | return 0; | |
1451 | ||
1452 | /* first, find out the vid. */ | |
0d125074 | 1453 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1454 | return 0; |
1455 | ||
c018ad3d | 1456 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1457 | |
1458 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1459 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1460 | orig_node->orig, vid); | |
23721387 SW |
1461 | if (!backbone_gw) |
1462 | return 0; | |
1463 | ||
3b300de3 | 1464 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1465 | return 1; |
1466 | } | |
1467 | ||
1468 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1469 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1470 | { |
56303d34 | 1471 | struct batadv_hard_iface *primary_if; |
23721387 | 1472 | |
807736f6 | 1473 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1474 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1475 | |
807736f6 | 1476 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1477 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1478 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1479 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1480 | } |
807736f6 | 1481 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1482 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1483 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1484 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1485 | } |
1486 | if (primary_if) | |
e5d89254 | 1487 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1488 | } |
1489 | ||
2c53040f BH |
1490 | /** |
1491 | * batadv_bla_rx | |
1492 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1493 | * @skb: the frame to be checked |
1494 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1495 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1496 | * |
1497 | * bla_rx avoidance checks if: | |
1498 | * * we have to race for a claim | |
1499 | * * if the frame is allowed on the LAN | |
1500 | * | |
1501 | * in these cases, the skb is further handled by this function and | |
1502 | * returns 1, otherwise it returns 0 and the caller shall further | |
1503 | * process the skb. | |
23721387 | 1504 | */ |
eb2deb6b AQ |
1505 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1506 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1507 | { |
1508 | struct ethhdr *ethhdr; | |
712bbfe4 | 1509 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1510 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1511 | int ret; |
1512 | ||
7ed4be95 | 1513 | ethhdr = eth_hdr(skb); |
23721387 | 1514 | |
e5d89254 | 1515 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1516 | if (!primary_if) |
1517 | goto handled; | |
1518 | ||
1519 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1520 | goto allow; | |
1521 | ||
807736f6 | 1522 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1523 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1524 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1525 | goto handled; |
1526 | ||
8fdd0153 | 1527 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1528 | search_claim.vid = vid; |
3b300de3 | 1529 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1530 | |
1531 | if (!claim) { | |
1532 | /* possible optimization: race for a claim */ | |
1533 | /* No claim exists yet, claim it for us! | |
1534 | */ | |
3b300de3 SE |
1535 | batadv_handle_claim(bat_priv, primary_if, |
1536 | primary_if->net_dev->dev_addr, | |
1537 | ethhdr->h_source, vid); | |
23721387 SW |
1538 | goto allow; |
1539 | } | |
1540 | ||
1541 | /* if it is our own claim ... */ | |
1eda58bf SE |
1542 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1543 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1544 | /* ... allow it in any case */ |
1545 | claim->lasttime = jiffies; | |
1546 | goto allow; | |
1547 | } | |
1548 | ||
1549 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1550 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1551 | /* ... drop it. the responsible gateway is in charge. | |
1552 | * | |
1553 | * We need to check is_bcast because with the gateway | |
1554 | * feature, broadcasts (like DHCP requests) may be sent | |
1555 | * using a unicast packet type. | |
1556 | */ | |
23721387 SW |
1557 | goto handled; |
1558 | } else { | |
1559 | /* seems the client considers us as its best gateway. | |
1560 | * send a claim and update the claim table | |
1561 | * immediately. | |
1562 | */ | |
3b300de3 SE |
1563 | batadv_handle_claim(bat_priv, primary_if, |
1564 | primary_if->net_dev->dev_addr, | |
1565 | ethhdr->h_source, vid); | |
23721387 SW |
1566 | goto allow; |
1567 | } | |
1568 | allow: | |
3b300de3 | 1569 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1570 | ret = 0; |
1571 | goto out; | |
1572 | ||
1573 | handled: | |
1574 | kfree_skb(skb); | |
1575 | ret = 1; | |
1576 | ||
1577 | out: | |
1578 | if (primary_if) | |
e5d89254 | 1579 | batadv_hardif_free_ref(primary_if); |
23721387 | 1580 | if (claim) |
3b300de3 | 1581 | batadv_claim_free_ref(claim); |
23721387 SW |
1582 | return ret; |
1583 | } | |
1584 | ||
2c53040f BH |
1585 | /** |
1586 | * batadv_bla_tx | |
1587 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1588 | * @skb: the frame to be checked |
1589 | * @vid: the VLAN ID of the frame | |
1590 | * | |
1591 | * bla_tx checks if: | |
1592 | * * a claim was received which has to be processed | |
1593 | * * the frame is allowed on the mesh | |
1594 | * | |
1595 | * in these cases, the skb is further handled by this function and | |
1596 | * returns 1, otherwise it returns 0 and the caller shall further | |
1597 | * process the skb. | |
9d2c9488 LL |
1598 | * |
1599 | * This call might reallocate skb data. | |
23721387 | 1600 | */ |
eb2deb6b AQ |
1601 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1602 | unsigned short vid) | |
23721387 SW |
1603 | { |
1604 | struct ethhdr *ethhdr; | |
712bbfe4 | 1605 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1606 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1607 | int ret = 0; |
1608 | ||
e5d89254 | 1609 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1610 | if (!primary_if) |
1611 | goto out; | |
1612 | ||
1613 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1614 | goto allow; | |
1615 | ||
3b300de3 | 1616 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1617 | goto handled; |
1618 | ||
7ed4be95 | 1619 | ethhdr = eth_hdr(skb); |
23721387 | 1620 | |
807736f6 | 1621 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1622 | /* don't allow broadcasts while requests are in flight */ |
1623 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1624 | goto handled; | |
1625 | ||
8fdd0153 | 1626 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1627 | search_claim.vid = vid; |
1628 | ||
3b300de3 | 1629 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1630 | |
1631 | /* if no claim exists, allow it. */ | |
1632 | if (!claim) | |
1633 | goto allow; | |
1634 | ||
1635 | /* check if we are responsible. */ | |
1eda58bf SE |
1636 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1637 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1638 | /* if yes, the client has roamed and we have |
1639 | * to unclaim it. | |
1640 | */ | |
3b300de3 SE |
1641 | batadv_handle_unclaim(bat_priv, primary_if, |
1642 | primary_if->net_dev->dev_addr, | |
1643 | ethhdr->h_source, vid); | |
23721387 SW |
1644 | goto allow; |
1645 | } | |
1646 | ||
1647 | /* check if it is a multicast/broadcast frame */ | |
1648 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1649 | /* drop it. the responsible gateway has forwarded it into | |
1650 | * the backbone network. | |
1651 | */ | |
1652 | goto handled; | |
1653 | } else { | |
1654 | /* we must allow it. at least if we are | |
1655 | * responsible for the DESTINATION. | |
1656 | */ | |
1657 | goto allow; | |
1658 | } | |
1659 | allow: | |
3b300de3 | 1660 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1661 | ret = 0; |
1662 | goto out; | |
1663 | handled: | |
1664 | ret = 1; | |
1665 | out: | |
1666 | if (primary_if) | |
e5d89254 | 1667 | batadv_hardif_free_ref(primary_if); |
23721387 | 1668 | if (claim) |
3b300de3 | 1669 | batadv_claim_free_ref(claim); |
23721387 SW |
1670 | return ret; |
1671 | } | |
9bf8e4d4 | 1672 | |
08adf151 | 1673 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1674 | { |
1675 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1676 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1677 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1678 | struct batadv_bla_claim *claim; |
56303d34 | 1679 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 1680 | struct hlist_head *head; |
5a1dd8a4 | 1681 | u16 backbone_crc; |
6b5e971a | 1682 | u32 i; |
9bf8e4d4 | 1683 | bool is_own; |
6b5e971a | 1684 | u8 *primary_addr; |
9bf8e4d4 | 1685 | |
30da63a6 ML |
1686 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1687 | if (!primary_if) | |
9bf8e4d4 | 1688 | goto out; |
9bf8e4d4 | 1689 | |
1eda58bf | 1690 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1691 | seq_printf(seq, |
39a32991 | 1692 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1693 | net_dev->name, primary_addr, |
807736f6 | 1694 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1695 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1696 | "Client", "VID", "Originator", "CRC"); |
1697 | for (i = 0; i < hash->size; i++) { | |
1698 | head = &hash->table[i]; | |
1699 | ||
1700 | rcu_read_lock(); | |
b67bfe0d | 1701 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1702 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1703 | primary_addr); | |
5a1dd8a4 SW |
1704 | |
1705 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
1706 | backbone_crc = claim->backbone_gw->crc; | |
1707 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
eb2deb6b | 1708 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1709 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1710 | claim->backbone_gw->orig, |
1711 | (is_own ? 'x' : ' '), | |
5a1dd8a4 | 1712 | backbone_crc); |
9bf8e4d4 SW |
1713 | } |
1714 | rcu_read_unlock(); | |
1715 | } | |
1716 | out: | |
1717 | if (primary_if) | |
e5d89254 | 1718 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1719 | return 0; |
9bf8e4d4 | 1720 | } |
536a23f1 SW |
1721 | |
1722 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1723 | { | |
1724 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1725 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1726 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1727 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1728 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1729 | struct hlist_head *head; |
1730 | int secs, msecs; | |
5a1dd8a4 | 1731 | u16 backbone_crc; |
6b5e971a | 1732 | u32 i; |
536a23f1 | 1733 | bool is_own; |
6b5e971a | 1734 | u8 *primary_addr; |
536a23f1 | 1735 | |
30da63a6 ML |
1736 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1737 | if (!primary_if) | |
536a23f1 | 1738 | goto out; |
536a23f1 SW |
1739 | |
1740 | primary_addr = primary_if->net_dev->dev_addr; | |
1741 | seq_printf(seq, | |
39a32991 | 1742 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1743 | net_dev->name, primary_addr, |
807736f6 | 1744 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1745 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1746 | "Originator", "VID", "last seen", "CRC"); |
1747 | for (i = 0; i < hash->size; i++) { | |
1748 | head = &hash->table[i]; | |
1749 | ||
1750 | rcu_read_lock(); | |
b67bfe0d | 1751 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1752 | msecs = jiffies_to_msecs(jiffies - |
1753 | backbone_gw->lasttime); | |
1754 | secs = msecs / 1000; | |
1755 | msecs = msecs % 1000; | |
1756 | ||
1757 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1758 | primary_addr); | |
1759 | if (is_own) | |
1760 | continue; | |
1761 | ||
5a1dd8a4 SW |
1762 | spin_lock_bh(&backbone_gw->crc_lock); |
1763 | backbone_crc = backbone_gw->crc; | |
1764 | spin_unlock_bh(&backbone_gw->crc_lock); | |
1765 | ||
eb2deb6b | 1766 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1767 | backbone_gw->orig, |
1768 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 1769 | msecs, backbone_crc); |
536a23f1 SW |
1770 | } |
1771 | rcu_read_unlock(); | |
1772 | } | |
1773 | out: | |
1774 | if (primary_if) | |
1775 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1776 | return 0; |
536a23f1 | 1777 | } |