Commit | Line | Data |
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e19f9759 | 1 | /* Copyright (C) 2011-2014 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 | ||
18 | #include "main.h" | |
19 | #include "hash.h" | |
20 | #include "hard-interface.h" | |
21 | #include "originator.h" | |
22 | #include "bridge_loop_avoidance.h" | |
20ff9d59 | 23 | #include "translation-table.h" |
23721387 SW |
24 | #include "send.h" |
25 | ||
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/crc16.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <net/arp.h> | |
30 | #include <linux/if_vlan.h> | |
31 | ||
3b300de3 | 32 | static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 33 | |
3b300de3 | 34 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
35 | static void |
36 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
37 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 SW |
38 | |
39 | /* return the index of the claim */ | |
3b300de3 | 40 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
23721387 | 41 | { |
712bbfe4 | 42 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 43 | uint32_t hash = 0; |
23721387 | 44 | |
07568d03 SW |
45 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
46 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
47 | |
48 | hash += (hash << 3); | |
49 | hash ^= (hash >> 11); | |
50 | hash += (hash << 15); | |
51 | ||
52 | return hash % size; | |
53 | } | |
54 | ||
55 | /* return the index of the backbone gateway */ | |
3b300de3 SE |
56 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
57 | uint32_t size) | |
23721387 | 58 | { |
712bbfe4 | 59 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
23721387 | 60 | uint32_t hash = 0; |
23721387 | 61 | |
07568d03 SW |
62 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
63 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); | |
23721387 SW |
64 | |
65 | hash += (hash << 3); | |
66 | hash ^= (hash >> 11); | |
67 | hash += (hash << 15); | |
68 | ||
69 | return hash % size; | |
70 | } | |
71 | ||
72 | ||
73 | /* compares address and vid of two backbone gws */ | |
3b300de3 SE |
74 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
75 | const void *data2) | |
23721387 | 76 | { |
bae98774 | 77 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 78 | hash_entry); |
bae98774 | 79 | const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2; |
23721387 | 80 | |
c76d1525 SW |
81 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
82 | return 0; | |
83 | ||
84 | if (gw1->vid != gw2->vid) | |
85 | return 0; | |
86 | ||
87 | return 1; | |
23721387 SW |
88 | } |
89 | ||
90 | /* compares address and vid of two claims */ | |
3b300de3 SE |
91 | static int batadv_compare_claim(const struct hlist_node *node, |
92 | const void *data2) | |
23721387 | 93 | { |
712bbfe4 | 94 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 95 | hash_entry); |
712bbfe4 | 96 | const struct batadv_bla_claim *cl1 = data1, *cl2 = data2; |
c76d1525 SW |
97 | |
98 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
99 | return 0; | |
100 | ||
101 | if (cl1->vid != cl2->vid) | |
102 | return 0; | |
23721387 | 103 | |
c76d1525 | 104 | return 1; |
23721387 SW |
105 | } |
106 | ||
107 | /* free a backbone gw */ | |
bae98774 ML |
108 | static void |
109 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) | |
23721387 SW |
110 | { |
111 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
112 | kfree_rcu(backbone_gw, rcu); | |
113 | } | |
114 | ||
115 | /* finally deinitialize the claim */ | |
3b300de3 | 116 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
23721387 | 117 | { |
712bbfe4 | 118 | struct batadv_bla_claim *claim; |
23721387 | 119 | |
712bbfe4 | 120 | claim = container_of(rcu, struct batadv_bla_claim, rcu); |
23721387 | 121 | |
3b300de3 | 122 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
123 | kfree(claim); |
124 | } | |
125 | ||
126 | /* free a claim, call claim_free_rcu if its the last reference */ | |
712bbfe4 | 127 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 SW |
128 | { |
129 | if (atomic_dec_and_test(&claim->refcount)) | |
3b300de3 | 130 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
23721387 SW |
131 | } |
132 | ||
1b371d13 SW |
133 | /** |
134 | * batadv_claim_hash_find | |
135 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
136 | * @data: search data (may be local/static data) |
137 | * | |
138 | * looks for a claim in the hash, and returns it if found | |
139 | * or NULL otherwise. | |
140 | */ | |
712bbfe4 ML |
141 | static struct batadv_bla_claim |
142 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
143 | struct batadv_bla_claim *data) | |
23721387 | 144 | { |
807736f6 | 145 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 146 | struct hlist_head *head; |
712bbfe4 ML |
147 | struct batadv_bla_claim *claim; |
148 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
149 | int index; |
150 | ||
151 | if (!hash) | |
152 | return NULL; | |
153 | ||
3b300de3 | 154 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
155 | head = &hash->table[index]; |
156 | ||
157 | rcu_read_lock(); | |
b67bfe0d | 158 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 159 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
160 | continue; |
161 | ||
162 | if (!atomic_inc_not_zero(&claim->refcount)) | |
163 | continue; | |
164 | ||
165 | claim_tmp = claim; | |
166 | break; | |
167 | } | |
168 | rcu_read_unlock(); | |
169 | ||
170 | return claim_tmp; | |
171 | } | |
172 | ||
2c53040f BH |
173 | /** |
174 | * batadv_backbone_hash_find - looks for a claim in the hash | |
175 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
176 | * @addr: the address of the originator |
177 | * @vid: the VLAN ID | |
178 | * | |
2c53040f | 179 | * Returns claim if found or NULL otherwise. |
23721387 | 180 | */ |
bae98774 | 181 | static struct batadv_bla_backbone_gw * |
56303d34 | 182 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, |
eb2deb6b | 183 | uint8_t *addr, unsigned short vid) |
23721387 | 184 | { |
807736f6 | 185 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 186 | struct hlist_head *head; |
bae98774 ML |
187 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
188 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
189 | int index; |
190 | ||
191 | if (!hash) | |
192 | return NULL; | |
193 | ||
194 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
195 | search_entry.vid = vid; | |
196 | ||
3b300de3 | 197 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
198 | head = &hash->table[index]; |
199 | ||
200 | rcu_read_lock(); | |
b67bfe0d | 201 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
202 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
203 | &search_entry)) | |
23721387 SW |
204 | continue; |
205 | ||
206 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
207 | continue; | |
208 | ||
209 | backbone_gw_tmp = backbone_gw; | |
210 | break; | |
211 | } | |
212 | rcu_read_unlock(); | |
213 | ||
214 | return backbone_gw_tmp; | |
215 | } | |
216 | ||
217 | /* delete all claims for a backbone */ | |
56303d34 | 218 | static void |
bae98774 | 219 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 220 | { |
5bf74e9c | 221 | struct batadv_hashtable *hash; |
b67bfe0d | 222 | struct hlist_node *node_tmp; |
23721387 | 223 | struct hlist_head *head; |
712bbfe4 | 224 | struct batadv_bla_claim *claim; |
23721387 SW |
225 | int i; |
226 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
227 | ||
807736f6 | 228 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
229 | if (!hash) |
230 | return; | |
231 | ||
232 | for (i = 0; i < hash->size; i++) { | |
233 | head = &hash->table[i]; | |
234 | list_lock = &hash->list_locks[i]; | |
235 | ||
236 | spin_lock_bh(list_lock); | |
b67bfe0d | 237 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 238 | head, hash_entry) { |
23721387 SW |
239 | if (claim->backbone_gw != backbone_gw) |
240 | continue; | |
241 | ||
3b300de3 | 242 | batadv_claim_free_ref(claim); |
b67bfe0d | 243 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
244 | } |
245 | spin_unlock_bh(list_lock); | |
246 | } | |
247 | ||
248 | /* all claims gone, intialize CRC */ | |
3964f728 | 249 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
250 | } |
251 | ||
2c53040f BH |
252 | /** |
253 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
254 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
255 | * @orig: the mac address to be announced within the claim |
256 | * @vid: the VLAN ID | |
257 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 258 | */ |
56303d34 | 259 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
eb2deb6b | 260 | unsigned short vid, int claimtype) |
23721387 SW |
261 | { |
262 | struct sk_buff *skb; | |
263 | struct ethhdr *ethhdr; | |
56303d34 | 264 | struct batadv_hard_iface *primary_if; |
23721387 SW |
265 | struct net_device *soft_iface; |
266 | uint8_t *hw_src; | |
96412690 | 267 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 268 | __be32 zeroip = 0; |
23721387 | 269 | |
e5d89254 | 270 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
271 | if (!primary_if) |
272 | return; | |
273 | ||
807736f6 | 274 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 275 | sizeof(local_claim_dest)); |
23721387 SW |
276 | local_claim_dest.type = claimtype; |
277 | ||
278 | soft_iface = primary_if->soft_iface; | |
279 | ||
280 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
281 | /* IP DST: 0.0.0.0 */ | |
282 | zeroip, | |
283 | primary_if->soft_iface, | |
284 | /* IP SRC: 0.0.0.0 */ | |
285 | zeroip, | |
286 | /* Ethernet DST: Broadcast */ | |
287 | NULL, | |
288 | /* Ethernet SRC/HW SRC: originator mac */ | |
289 | primary_if->net_dev->dev_addr, | |
99e966fc | 290 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 291 | * with XX = claim type |
38ef3d1d | 292 | * and YY:YY = group id |
23721387 SW |
293 | */ |
294 | (uint8_t *)&local_claim_dest); | |
295 | ||
296 | if (!skb) | |
297 | goto out; | |
298 | ||
299 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 300 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
301 | |
302 | /* now we pretend that the client would have sent this ... */ | |
303 | switch (claimtype) { | |
3eb8773e | 304 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
305 | /* normal claim frame |
306 | * set Ethernet SRC to the clients mac | |
307 | */ | |
308 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
39c75a51 | 309 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
310 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
311 | BATADV_PRINT_VID(vid)); | |
23721387 | 312 | break; |
3eb8773e | 313 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
314 | /* unclaim frame |
315 | * set HW SRC to the clients mac | |
316 | */ | |
317 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 318 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 319 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 320 | BATADV_PRINT_VID(vid)); |
23721387 | 321 | break; |
acd34afa | 322 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
323 | /* announcement frame |
324 | * set HW SRC to the special mac containg the crc | |
325 | */ | |
326 | memcpy(hw_src, mac, ETH_ALEN); | |
39c75a51 | 327 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 328 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 329 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 330 | break; |
acd34afa | 331 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 332 | /* request frame |
99e966fc SW |
333 | * set HW SRC and header destination to the receiving backbone |
334 | * gws mac | |
23721387 SW |
335 | */ |
336 | memcpy(hw_src, mac, ETH_ALEN); | |
337 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
39c75a51 | 338 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 339 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
340 | ethhdr->h_source, ethhdr->h_dest, |
341 | BATADV_PRINT_VID(vid)); | |
23721387 | 342 | break; |
23721387 SW |
343 | } |
344 | ||
eb2deb6b AQ |
345 | if (vid & BATADV_VLAN_HAS_TAG) |
346 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
347 | vid & VLAN_VID_MASK); | |
23721387 SW |
348 | |
349 | skb_reset_mac_header(skb); | |
350 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
351 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
352 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
353 | skb->len + ETH_HLEN); | |
23721387 SW |
354 | soft_iface->last_rx = jiffies; |
355 | ||
356 | netif_rx(skb); | |
357 | out: | |
358 | if (primary_if) | |
e5d89254 | 359 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
360 | } |
361 | ||
2c53040f BH |
362 | /** |
363 | * batadv_bla_get_backbone_gw | |
364 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
365 | * @orig: the mac address of the originator |
366 | * @vid: the VLAN ID | |
367 | * | |
368 | * searches for the backbone gw or creates a new one if it could not | |
369 | * be found. | |
370 | */ | |
bae98774 | 371 | static struct batadv_bla_backbone_gw * |
56303d34 | 372 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, |
eb2deb6b | 373 | unsigned short vid, bool own_backbone) |
23721387 | 374 | { |
bae98774 | 375 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 376 | struct batadv_orig_node *orig_node; |
23721387 SW |
377 | int hash_added; |
378 | ||
3b300de3 | 379 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
380 | |
381 | if (entry) | |
382 | return entry; | |
383 | ||
39c75a51 | 384 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 385 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 386 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
387 | |
388 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
389 | if (!entry) | |
390 | return NULL; | |
391 | ||
392 | entry->vid = vid; | |
393 | entry->lasttime = jiffies; | |
3964f728 | 394 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 SW |
395 | entry->bat_priv = bat_priv; |
396 | atomic_set(&entry->request_sent, 0); | |
28709878 | 397 | atomic_set(&entry->wait_periods, 0); |
23721387 SW |
398 | memcpy(entry->orig, orig, ETH_ALEN); |
399 | ||
400 | /* one for the hash, one for returning */ | |
401 | atomic_set(&entry->refcount, 2); | |
402 | ||
807736f6 | 403 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
404 | batadv_compare_backbone_gw, |
405 | batadv_choose_backbone_gw, entry, | |
406 | &entry->hash_entry); | |
23721387 SW |
407 | |
408 | if (unlikely(hash_added != 0)) { | |
409 | /* hash failed, free the structure */ | |
410 | kfree(entry); | |
411 | return NULL; | |
412 | } | |
413 | ||
95fb130d | 414 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 415 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 416 | if (orig_node) { |
95fb130d | 417 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 418 | "became a backbone gateway"); |
7d211efc | 419 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 420 | } |
52aebd6a | 421 | |
d807f272 | 422 | if (own_backbone) { |
52aebd6a SW |
423 | batadv_bla_send_announce(bat_priv, entry); |
424 | ||
d807f272 SW |
425 | /* this will be decreased in the worker thread */ |
426 | atomic_inc(&entry->request_sent); | |
28709878 | 427 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
428 | atomic_inc(&bat_priv->bla.num_requests); |
429 | } | |
430 | ||
23721387 SW |
431 | return entry; |
432 | } | |
433 | ||
434 | /* update or add the own backbone gw to make sure we announce | |
435 | * where we receive other backbone gws | |
436 | */ | |
56303d34 SE |
437 | static void |
438 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
439 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 440 | unsigned short vid) |
23721387 | 441 | { |
bae98774 | 442 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 443 | |
3b300de3 SE |
444 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
445 | primary_if->net_dev->dev_addr, | |
52aebd6a | 446 | vid, true); |
23721387 SW |
447 | if (unlikely(!backbone_gw)) |
448 | return; | |
449 | ||
450 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 451 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
452 | } |
453 | ||
1b371d13 SW |
454 | /** |
455 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
456 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
457 | * @vid: the vid where the request came on |
458 | * | |
459 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
460 | * to allow the requester another check if the CRC is correct now. | |
461 | */ | |
56303d34 SE |
462 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
463 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 464 | unsigned short vid) |
23721387 | 465 | { |
23721387 | 466 | struct hlist_head *head; |
5bf74e9c | 467 | struct batadv_hashtable *hash; |
712bbfe4 | 468 | struct batadv_bla_claim *claim; |
bae98774 | 469 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
470 | int i; |
471 | ||
39c75a51 | 472 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 473 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 474 | |
3b300de3 SE |
475 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
476 | primary_if->net_dev->dev_addr, | |
477 | vid); | |
23721387 SW |
478 | if (!backbone_gw) |
479 | return; | |
480 | ||
807736f6 | 481 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
482 | for (i = 0; i < hash->size; i++) { |
483 | head = &hash->table[i]; | |
484 | ||
485 | rcu_read_lock(); | |
b67bfe0d | 486 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
487 | /* only own claims are interesting */ |
488 | if (claim->backbone_gw != backbone_gw) | |
489 | continue; | |
490 | ||
3b300de3 | 491 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 492 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
493 | } |
494 | rcu_read_unlock(); | |
495 | } | |
496 | ||
497 | /* finally, send an announcement frame */ | |
3b300de3 SE |
498 | batadv_bla_send_announce(bat_priv, backbone_gw); |
499 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
500 | } |
501 | ||
1b371d13 SW |
502 | /** |
503 | * batadv_bla_send_request - send a request to repeat claims | |
504 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
505 | * |
506 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
507 | * After the request, it will repeat all of his own claims and finally | |
508 | * send an announcement claim with which we can check again. | |
509 | */ | |
bae98774 | 510 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
511 | { |
512 | /* first, remove all old entries */ | |
3b300de3 | 513 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 514 | |
39c75a51 SE |
515 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
516 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
517 | |
518 | /* send request */ | |
3b300de3 | 519 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 520 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
521 | |
522 | /* no local broadcasts should be sent or received, for now. */ | |
523 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 524 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
525 | atomic_set(&backbone_gw->request_sent, 1); |
526 | } | |
527 | } | |
528 | ||
1b371d13 SW |
529 | /** |
530 | * batadv_bla_send_announce | |
531 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
532 | * @backbone_gw: our backbone gateway which should be announced |
533 | * | |
534 | * This function sends an announcement. It is called from multiple | |
535 | * places. | |
536 | */ | |
56303d34 | 537 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 538 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
539 | { |
540 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 541 | __be16 crc; |
23721387 | 542 | |
3b300de3 | 543 | memcpy(mac, batadv_announce_mac, 4); |
23721387 | 544 | crc = htons(backbone_gw->crc); |
1a5852d8 | 545 | memcpy(&mac[4], &crc, 2); |
23721387 | 546 | |
3b300de3 | 547 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 548 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
549 | } |
550 | ||
2c53040f BH |
551 | /** |
552 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
553 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
554 | * @mac: the mac address of the claim |
555 | * @vid: the VLAN ID of the frame | |
556 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 557 | */ |
56303d34 | 558 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
eb2deb6b | 559 | const uint8_t *mac, const unsigned short vid, |
bae98774 | 560 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 561 | { |
712bbfe4 ML |
562 | struct batadv_bla_claim *claim; |
563 | struct batadv_bla_claim search_claim; | |
23721387 SW |
564 | int hash_added; |
565 | ||
566 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
567 | search_claim.vid = vid; | |
3b300de3 | 568 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
569 | |
570 | /* create a new claim entry if it does not exist yet. */ | |
571 | if (!claim) { | |
572 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
573 | if (!claim) | |
574 | return; | |
575 | ||
576 | memcpy(claim->addr, mac, ETH_ALEN); | |
577 | claim->vid = vid; | |
578 | claim->lasttime = jiffies; | |
579 | claim->backbone_gw = backbone_gw; | |
580 | ||
581 | atomic_set(&claim->refcount, 2); | |
39c75a51 | 582 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 583 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 584 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 585 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
586 | batadv_compare_claim, |
587 | batadv_choose_claim, claim, | |
588 | &claim->hash_entry); | |
23721387 SW |
589 | |
590 | if (unlikely(hash_added != 0)) { | |
591 | /* only local changes happened. */ | |
592 | kfree(claim); | |
593 | return; | |
594 | } | |
595 | } else { | |
596 | claim->lasttime = jiffies; | |
597 | if (claim->backbone_gw == backbone_gw) | |
598 | /* no need to register a new backbone */ | |
599 | goto claim_free_ref; | |
600 | ||
39c75a51 | 601 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 602 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 603 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 604 | |
bbb1f90e | 605 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
3b300de3 | 606 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
607 | } |
608 | /* set (new) backbone gw */ | |
609 | atomic_inc(&backbone_gw->refcount); | |
610 | claim->backbone_gw = backbone_gw; | |
611 | ||
612 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
613 | backbone_gw->lasttime = jiffies; | |
614 | ||
615 | claim_free_ref: | |
3b300de3 | 616 | batadv_claim_free_ref(claim); |
23721387 SW |
617 | } |
618 | ||
619 | /* Delete a claim from the claim hash which has the | |
620 | * given mac address and vid. | |
621 | */ | |
56303d34 | 622 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
eb2deb6b | 623 | const uint8_t *mac, const unsigned short vid) |
23721387 | 624 | { |
712bbfe4 | 625 | struct batadv_bla_claim search_claim, *claim; |
23721387 SW |
626 | |
627 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
628 | search_claim.vid = vid; | |
3b300de3 | 629 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
630 | if (!claim) |
631 | return; | |
632 | ||
39c75a51 | 633 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 634 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 635 | |
807736f6 | 636 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
637 | batadv_choose_claim, claim); |
638 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 SW |
639 | |
640 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
641 | ||
642 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 643 | batadv_claim_free_ref(claim); |
23721387 SW |
644 | } |
645 | ||
646 | /* check for ANNOUNCE frame, return 1 if handled */ | |
56303d34 | 647 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
3b300de3 | 648 | uint8_t *an_addr, uint8_t *backbone_addr, |
eb2deb6b | 649 | unsigned short vid) |
23721387 | 650 | { |
bae98774 | 651 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
652 | uint16_t crc; |
653 | ||
3b300de3 | 654 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
655 | return 0; |
656 | ||
52aebd6a SW |
657 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
658 | false); | |
23721387 SW |
659 | |
660 | if (unlikely(!backbone_gw)) | |
661 | return 1; | |
662 | ||
663 | ||
664 | /* handle as ANNOUNCE frame */ | |
665 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 666 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 667 | |
39c75a51 | 668 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 669 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 670 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 SW |
671 | |
672 | if (backbone_gw->crc != crc) { | |
39c75a51 | 673 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 674 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
675 | backbone_gw->orig, |
676 | BATADV_PRINT_VID(backbone_gw->vid), | |
1eda58bf | 677 | backbone_gw->crc, crc); |
23721387 | 678 | |
3b300de3 | 679 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
680 | } else { |
681 | /* if we have sent a request and the crc was OK, | |
682 | * we can allow traffic again. | |
683 | */ | |
684 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 685 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
686 | atomic_set(&backbone_gw->request_sent, 0); |
687 | } | |
688 | } | |
689 | ||
3b300de3 | 690 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
691 | return 1; |
692 | } | |
693 | ||
694 | /* check for REQUEST frame, return 1 if handled */ | |
56303d34 SE |
695 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
696 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 697 | uint8_t *backbone_addr, |
eb2deb6b | 698 | struct ethhdr *ethhdr, unsigned short vid) |
23721387 SW |
699 | { |
700 | /* check for REQUEST frame */ | |
1eda58bf | 701 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
702 | return 0; |
703 | ||
704 | /* sanity check, this should not happen on a normal switch, | |
705 | * we ignore it in this case. | |
706 | */ | |
1eda58bf | 707 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
708 | return 1; |
709 | ||
39c75a51 | 710 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 711 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 712 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 713 | |
3b300de3 | 714 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
715 | return 1; |
716 | } | |
717 | ||
718 | /* check for UNCLAIM frame, return 1 if handled */ | |
56303d34 SE |
719 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
720 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 721 | uint8_t *backbone_addr, |
eb2deb6b | 722 | uint8_t *claim_addr, unsigned short vid) |
23721387 | 723 | { |
bae98774 | 724 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
725 | |
726 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
727 | if (primary_if && batadv_compare_eth(backbone_addr, |
728 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 729 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 730 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 731 | |
3b300de3 | 732 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
733 | |
734 | if (!backbone_gw) | |
735 | return 1; | |
736 | ||
737 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 738 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 739 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 740 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 741 | |
3b300de3 SE |
742 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
743 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
744 | return 1; |
745 | } | |
746 | ||
747 | /* check for CLAIM frame, return 1 if handled */ | |
56303d34 SE |
748 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
749 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 750 | uint8_t *backbone_addr, uint8_t *claim_addr, |
eb2deb6b | 751 | unsigned short vid) |
23721387 | 752 | { |
bae98774 | 753 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
754 | |
755 | /* register the gateway if not yet available, and add the claim. */ | |
756 | ||
52aebd6a SW |
757 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
758 | false); | |
23721387 SW |
759 | |
760 | if (unlikely(!backbone_gw)) | |
761 | return 1; | |
762 | ||
763 | /* this must be a CLAIM frame */ | |
3b300de3 | 764 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 765 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 766 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 767 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
768 | |
769 | /* TODO: we could call something like tt_local_del() here. */ | |
770 | ||
3b300de3 | 771 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
772 | return 1; |
773 | } | |
774 | ||
2c53040f BH |
775 | /** |
776 | * batadv_check_claim_group | |
777 | * @bat_priv: the bat priv with all the soft interface information | |
38ef3d1d SW |
778 | * @hw_src: the Hardware source in the ARP Header |
779 | * @hw_dst: the Hardware destination in the ARP Header | |
780 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
781 | * | |
782 | * checks if it is a claim packet and if its on the same group. | |
783 | * This function also applies the group ID of the sender | |
784 | * if it is in the same mesh. | |
785 | * | |
786 | * returns: | |
787 | * 2 - if it is a claim packet and on the same group | |
788 | * 1 - if is a claim packet from another group | |
789 | * 0 - if it is not a claim packet | |
790 | */ | |
56303d34 SE |
791 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
792 | struct batadv_hard_iface *primary_if, | |
3b300de3 SE |
793 | uint8_t *hw_src, uint8_t *hw_dst, |
794 | struct ethhdr *ethhdr) | |
38ef3d1d SW |
795 | { |
796 | uint8_t *backbone_addr; | |
56303d34 | 797 | struct batadv_orig_node *orig_node; |
96412690 | 798 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 799 | |
96412690 | 800 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 801 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d SW |
802 | |
803 | /* check if it is a claim packet in general */ | |
804 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
805 | sizeof(bla_dst->magic)) != 0) | |
806 | return 0; | |
807 | ||
808 | /* if announcement packet, use the source, | |
809 | * otherwise assume it is in the hw_src | |
810 | */ | |
811 | switch (bla_dst->type) { | |
3eb8773e | 812 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
813 | backbone_addr = hw_src; |
814 | break; | |
acd34afa SE |
815 | case BATADV_CLAIM_TYPE_REQUEST: |
816 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 817 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
818 | backbone_addr = ethhdr->h_source; |
819 | break; | |
820 | default: | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 825 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
826 | return 0; |
827 | ||
828 | /* if its already the same group, it is fine. */ | |
829 | if (bla_dst->group == bla_dst_own->group) | |
830 | return 2; | |
831 | ||
832 | /* lets see if this originator is in our mesh */ | |
da641193 | 833 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
834 | |
835 | /* dont accept claims from gateways which are not in | |
836 | * the same mesh or group. | |
837 | */ | |
838 | if (!orig_node) | |
839 | return 1; | |
840 | ||
841 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
842 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 843 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 844 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 845 | ntohs(bla_dst->group)); |
38ef3d1d SW |
846 | bla_dst_own->group = bla_dst->group; |
847 | } | |
848 | ||
7d211efc | 849 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
850 | |
851 | return 2; | |
852 | } | |
853 | ||
854 | ||
1b371d13 SW |
855 | /** |
856 | * batadv_bla_process_claim | |
857 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
858 | * @skb: the frame to be checked |
859 | * | |
860 | * Check if this is a claim frame, and process it accordingly. | |
861 | * | |
862 | * returns 1 if it was a claim frame, otherwise return 0 to | |
863 | * tell the callee that it can use the frame on its own. | |
864 | */ | |
56303d34 SE |
865 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
866 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 867 | struct sk_buff *skb) |
23721387 | 868 | { |
c018ad3d AQ |
869 | struct batadv_bla_claim_dst *bla_dst; |
870 | uint8_t *hw_src, *hw_dst; | |
23721387 | 871 | struct vlan_ethhdr *vhdr; |
c018ad3d | 872 | struct ethhdr *ethhdr; |
23721387 | 873 | struct arphdr *arphdr; |
c018ad3d | 874 | unsigned short vid; |
293e9338 | 875 | __be16 proto; |
23721387 | 876 | int headlen; |
38ef3d1d | 877 | int ret; |
23721387 | 878 | |
c018ad3d | 879 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 880 | ethhdr = eth_hdr(skb); |
23721387 | 881 | |
c018ad3d AQ |
882 | proto = ethhdr->h_proto; |
883 | headlen = ETH_HLEN; | |
884 | if (vid & BATADV_VLAN_HAS_TAG) { | |
23721387 | 885 | vhdr = (struct vlan_ethhdr *)ethhdr; |
293e9338 | 886 | proto = vhdr->h_vlan_encapsulated_proto; |
c018ad3d | 887 | headlen += VLAN_HLEN; |
23721387 SW |
888 | } |
889 | ||
293e9338 | 890 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
891 | return 0; /* not a claim frame */ |
892 | ||
893 | /* this must be a ARP frame. check if it is a claim. */ | |
894 | ||
895 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
896 | return 0; | |
897 | ||
898 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 899 | ethhdr = eth_hdr(skb); |
23721387 SW |
900 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); |
901 | ||
902 | /* Check whether the ARP frame carries a valid | |
903 | * IP information | |
904 | */ | |
23721387 SW |
905 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
906 | return 0; | |
907 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
908 | return 0; | |
909 | if (arphdr->ar_hln != ETH_ALEN) | |
910 | return 0; | |
911 | if (arphdr->ar_pln != 4) | |
912 | return 0; | |
913 | ||
914 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
915 | hw_dst = hw_src + ETH_ALEN + 4; | |
96412690 | 916 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
23721387 SW |
917 | |
918 | /* check if it is a claim frame. */ | |
3b300de3 SE |
919 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
920 | ethhdr); | |
38ef3d1d | 921 | if (ret == 1) |
39c75a51 | 922 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 923 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
924 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
925 | hw_dst); | |
38ef3d1d SW |
926 | |
927 | if (ret < 2) | |
928 | return ret; | |
23721387 SW |
929 | |
930 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 931 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
932 | |
933 | /* check for the different types of claim frames ... */ | |
934 | switch (bla_dst->type) { | |
3eb8773e | 935 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
936 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
937 | ethhdr->h_source, vid)) | |
23721387 SW |
938 | return 1; |
939 | break; | |
3eb8773e | 940 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
941 | if (batadv_handle_unclaim(bat_priv, primary_if, |
942 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
943 | return 1; |
944 | break; | |
945 | ||
acd34afa | 946 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
947 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
948 | vid)) | |
23721387 SW |
949 | return 1; |
950 | break; | |
acd34afa | 951 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
952 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
953 | vid)) | |
23721387 SW |
954 | return 1; |
955 | break; | |
956 | } | |
957 | ||
39c75a51 | 958 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 959 | "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 | 960 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
961 | return 1; |
962 | } | |
963 | ||
964 | /* Check when we last heard from other nodes, and remove them in case of | |
965 | * a time out, or clean all backbone gws if now is set. | |
966 | */ | |
56303d34 | 967 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 968 | { |
bae98774 | 969 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 970 | struct hlist_node *node_tmp; |
23721387 | 971 | struct hlist_head *head; |
5bf74e9c | 972 | struct batadv_hashtable *hash; |
23721387 SW |
973 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
974 | int i; | |
975 | ||
807736f6 | 976 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
977 | if (!hash) |
978 | return; | |
979 | ||
980 | for (i = 0; i < hash->size; i++) { | |
981 | head = &hash->table[i]; | |
982 | list_lock = &hash->list_locks[i]; | |
983 | ||
984 | spin_lock_bh(list_lock); | |
b67bfe0d | 985 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
986 | head, hash_entry) { |
987 | if (now) | |
988 | goto purge_now; | |
1eda58bf | 989 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 990 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
991 | continue; |
992 | ||
39c75a51 | 993 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
994 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
995 | backbone_gw->orig); | |
23721387 SW |
996 | |
997 | purge_now: | |
998 | /* don't wait for the pending request anymore */ | |
999 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1000 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1001 | |
3b300de3 | 1002 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1003 | |
b67bfe0d | 1004 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1005 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1006 | } |
1007 | spin_unlock_bh(list_lock); | |
1008 | } | |
1009 | } | |
1010 | ||
2c53040f BH |
1011 | /** |
1012 | * batadv_bla_purge_claims | |
1013 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1014 | * @primary_if: the selected primary interface, may be NULL if now is set |
1015 | * @now: whether the whole hash shall be wiped now | |
1016 | * | |
1017 | * Check when we heard last time from our own claims, and remove them in case of | |
1018 | * a time out, or clean all claims if now is set | |
1019 | */ | |
56303d34 SE |
1020 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1021 | struct batadv_hard_iface *primary_if, | |
1022 | int now) | |
23721387 | 1023 | { |
712bbfe4 | 1024 | struct batadv_bla_claim *claim; |
23721387 | 1025 | struct hlist_head *head; |
5bf74e9c | 1026 | struct batadv_hashtable *hash; |
23721387 SW |
1027 | int i; |
1028 | ||
807736f6 | 1029 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1030 | if (!hash) |
1031 | return; | |
1032 | ||
1033 | for (i = 0; i < hash->size; i++) { | |
1034 | head = &hash->table[i]; | |
1035 | ||
1036 | rcu_read_lock(); | |
b67bfe0d | 1037 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1038 | if (now) |
1039 | goto purge_now; | |
1eda58bf SE |
1040 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1041 | primary_if->net_dev->dev_addr)) | |
23721387 | 1042 | continue; |
1eda58bf | 1043 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1044 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1045 | continue; |
1046 | ||
39c75a51 | 1047 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1048 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1049 | claim->addr, claim->vid); | |
23721387 SW |
1050 | |
1051 | purge_now: | |
3b300de3 SE |
1052 | batadv_handle_unclaim(bat_priv, primary_if, |
1053 | claim->backbone_gw->orig, | |
1054 | claim->addr, claim->vid); | |
23721387 SW |
1055 | } |
1056 | rcu_read_unlock(); | |
1057 | } | |
1058 | } | |
1059 | ||
2c53040f BH |
1060 | /** |
1061 | * batadv_bla_update_orig_address | |
1062 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1063 | * @primary_if: the new selected primary_if |
1064 | * @oldif: the old primary interface, may be NULL | |
1065 | * | |
1066 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1067 | */ |
56303d34 SE |
1068 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1069 | struct batadv_hard_iface *primary_if, | |
1070 | struct batadv_hard_iface *oldif) | |
23721387 | 1071 | { |
bae98774 | 1072 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1073 | struct hlist_head *head; |
5bf74e9c | 1074 | struct batadv_hashtable *hash; |
807736f6 | 1075 | __be16 group; |
23721387 SW |
1076 | int i; |
1077 | ||
38ef3d1d | 1078 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1079 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1080 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1081 | |
d5b4c93e SW |
1082 | /* purge everything when bridge loop avoidance is turned off */ |
1083 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1084 | oldif = NULL; | |
1085 | ||
23721387 | 1086 | if (!oldif) { |
3b300de3 SE |
1087 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1088 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1089 | return; |
1090 | } | |
1091 | ||
807736f6 | 1092 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1093 | if (!hash) |
1094 | return; | |
1095 | ||
1096 | for (i = 0; i < hash->size; i++) { | |
1097 | head = &hash->table[i]; | |
1098 | ||
1099 | rcu_read_lock(); | |
b67bfe0d | 1100 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1101 | /* own orig still holds the old value. */ |
1eda58bf SE |
1102 | if (!batadv_compare_eth(backbone_gw->orig, |
1103 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1104 | continue; |
1105 | ||
1106 | memcpy(backbone_gw->orig, | |
1107 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1108 | /* send an announce frame so others will ask for our | |
1109 | * claims and update their tables. | |
1110 | */ | |
3b300de3 | 1111 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1112 | } |
1113 | rcu_read_unlock(); | |
1114 | } | |
1115 | } | |
1116 | ||
23721387 SW |
1117 | /* periodic work to do: |
1118 | * * purge structures when they are too old | |
1119 | * * send announcements | |
1120 | */ | |
3b300de3 | 1121 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1122 | { |
bbb1f90e | 1123 | struct delayed_work *delayed_work; |
56303d34 | 1124 | struct batadv_priv *bat_priv; |
807736f6 | 1125 | struct batadv_priv_bla *priv_bla; |
23721387 | 1126 | struct hlist_head *head; |
bae98774 | 1127 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1128 | struct batadv_hashtable *hash; |
56303d34 | 1129 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1130 | int i; |
1131 | ||
bbb1f90e | 1132 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1133 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1134 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1135 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1136 | if (!primary_if) |
1137 | goto out; | |
1138 | ||
3b300de3 SE |
1139 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1140 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1141 | |
1142 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1143 | goto out; | |
1144 | ||
807736f6 | 1145 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1146 | if (!hash) |
1147 | goto out; | |
1148 | ||
1149 | for (i = 0; i < hash->size; i++) { | |
1150 | head = &hash->table[i]; | |
1151 | ||
1152 | rcu_read_lock(); | |
b67bfe0d | 1153 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1154 | if (!batadv_compare_eth(backbone_gw->orig, |
1155 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1156 | continue; |
1157 | ||
1158 | backbone_gw->lasttime = jiffies; | |
1159 | ||
3b300de3 | 1160 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1161 | |
1162 | /* request_sent is only set after creation to avoid | |
1163 | * problems when we are not yet known as backbone gw | |
1164 | * in the backbone. | |
1165 | * | |
28709878 SW |
1166 | * We can reset this now after we waited some periods |
1167 | * to give bridge forward delays and bla group forming | |
1168 | * some grace time. | |
d807f272 SW |
1169 | */ |
1170 | ||
1171 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1172 | continue; | |
1173 | ||
28709878 SW |
1174 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1175 | continue; | |
1176 | ||
d807f272 SW |
1177 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1178 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1179 | } |
1180 | rcu_read_unlock(); | |
1181 | } | |
1182 | out: | |
1183 | if (primary_if) | |
e5d89254 | 1184 | batadv_hardif_free_ref(primary_if); |
23721387 | 1185 | |
72414442 AQ |
1186 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1187 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1188 | } |
1189 | ||
5d52dad2 SE |
1190 | /* The hash for claim and backbone hash receive the same key because they |
1191 | * are getting initialized by hash_new with the same key. Reinitializing | |
1192 | * them with to different keys to allow nested locking without generating | |
1193 | * lockdep warnings | |
1194 | */ | |
3b300de3 SE |
1195 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1196 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1197 | |
23721387 | 1198 | /* initialize all bla structures */ |
56303d34 | 1199 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1200 | { |
fe2da6ff | 1201 | int i; |
38ef3d1d | 1202 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1203 | struct batadv_hard_iface *primary_if; |
807736f6 SE |
1204 | uint16_t crc; |
1205 | unsigned long entrytime; | |
fe2da6ff | 1206 | |
7dac7b76 LL |
1207 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1208 | ||
39c75a51 | 1209 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1210 | |
38ef3d1d | 1211 | /* setting claim destination address */ |
807736f6 SE |
1212 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1213 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1214 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1215 | if (primary_if) { |
807736f6 SE |
1216 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1217 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1218 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1219 | } else { |
807736f6 | 1220 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1221 | } |
1222 | ||
fe2da6ff | 1223 | /* initialize the duplicate list */ |
807736f6 | 1224 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1225 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1226 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1227 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1228 | |
807736f6 | 1229 | if (bat_priv->bla.claim_hash) |
5346c35e | 1230 | return 0; |
23721387 | 1231 | |
807736f6 SE |
1232 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1233 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1234 | |
807736f6 | 1235 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1236 | return -ENOMEM; |
23721387 | 1237 | |
807736f6 | 1238 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1239 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1240 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1241 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1242 | |
39c75a51 | 1243 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1244 | |
72414442 AQ |
1245 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1246 | ||
1247 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1248 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1249 | return 0; |
23721387 SW |
1250 | } |
1251 | ||
2c53040f BH |
1252 | /** |
1253 | * batadv_bla_check_bcast_duplist | |
1254 | * @bat_priv: the bat priv with all the soft interface information | |
004e86fc | 1255 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1256 | * |
1257 | * check if it is on our broadcast list. Another gateway might | |
1258 | * have sent the same packet because it is connected to the same backbone, | |
1259 | * so we have to remove this duplicate. | |
1260 | * | |
1261 | * This is performed by checking the CRC, which will tell us | |
1262 | * with a good chance that it is the same packet. If it is furthermore | |
1263 | * sent by another host, drop it. We allow equal packets from | |
1264 | * the same host however as this might be intended. | |
9cfc7bd6 | 1265 | */ |
56303d34 | 1266 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1267 | struct sk_buff *skb) |
fe2da6ff | 1268 | { |
004e86fc SW |
1269 | int i, curr, ret = 0; |
1270 | __be32 crc; | |
1271 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1272 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1273 | |
004e86fc | 1274 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1275 | |
1276 | /* calculate the crc ... */ | |
004e86fc | 1277 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1278 | |
7dac7b76 LL |
1279 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1280 | ||
42d0b044 | 1281 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1282 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1283 | curr %= BATADV_DUPLIST_SIZE; | |
1284 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1285 | |
1286 | /* we can stop searching if the entry is too old ; | |
1287 | * later entries will be even older | |
1288 | */ | |
42d0b044 SE |
1289 | if (batadv_has_timed_out(entry->entrytime, |
1290 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1291 | break; |
1292 | ||
1293 | if (entry->crc != crc) | |
1294 | continue; | |
1295 | ||
1eda58bf | 1296 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1297 | continue; |
1298 | ||
1299 | /* this entry seems to match: same crc, not too old, | |
1300 | * and from another gw. therefore return 1 to forbid it. | |
1301 | */ | |
7dac7b76 LL |
1302 | ret = 1; |
1303 | goto out; | |
fe2da6ff | 1304 | } |
7dac7b76 LL |
1305 | /* not found, add a new entry (overwrite the oldest entry) |
1306 | * and allow it, its the first occurence. | |
1307 | */ | |
807736f6 | 1308 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1309 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1310 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1311 | entry->crc = crc; |
1312 | entry->entrytime = jiffies; | |
1313 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
807736f6 | 1314 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1315 | |
7dac7b76 LL |
1316 | out: |
1317 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1318 | ||
1319 | return ret; | |
fe2da6ff SW |
1320 | } |
1321 | ||
1322 | ||
1323 | ||
1b371d13 SW |
1324 | /** |
1325 | * batadv_bla_is_backbone_gw_orig | |
1326 | * @bat_priv: the bat priv with all the soft interface information | |
20ff9d59 | 1327 | * @orig: originator mac address |
cfd4f757 | 1328 | * @vid: VLAN identifier |
20ff9d59 | 1329 | * |
cfd4f757 | 1330 | * Check if the originator is a gateway for the VLAN identified by vid. |
20ff9d59 | 1331 | * |
cfd4f757 | 1332 | * Returns true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1333 | */ |
cfd4f757 AQ |
1334 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig, |
1335 | unsigned short vid) | |
20ff9d59 | 1336 | { |
807736f6 | 1337 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1338 | struct hlist_head *head; |
bae98774 | 1339 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1340 | int i; |
1341 | ||
1342 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1343 | return false; |
20ff9d59 SW |
1344 | |
1345 | if (!hash) | |
cfd4f757 | 1346 | return false; |
20ff9d59 SW |
1347 | |
1348 | for (i = 0; i < hash->size; i++) { | |
1349 | head = &hash->table[i]; | |
1350 | ||
1351 | rcu_read_lock(); | |
b67bfe0d | 1352 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1353 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1354 | backbone_gw->vid == vid) { | |
20ff9d59 | 1355 | rcu_read_unlock(); |
cfd4f757 | 1356 | return true; |
20ff9d59 SW |
1357 | } |
1358 | } | |
1359 | rcu_read_unlock(); | |
1360 | } | |
1361 | ||
cfd4f757 | 1362 | return false; |
20ff9d59 SW |
1363 | } |
1364 | ||
1365 | ||
2c53040f BH |
1366 | /** |
1367 | * batadv_bla_is_backbone_gw | |
1368 | * @skb: the frame to be checked | |
23721387 SW |
1369 | * @orig_node: the orig_node of the frame |
1370 | * @hdr_size: maximum length of the frame | |
1371 | * | |
1372 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1373 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1374 | * returns 0. | |
23721387 | 1375 | */ |
08adf151 | 1376 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1377 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1378 | { |
bae98774 | 1379 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1380 | unsigned short vid; |
23721387 SW |
1381 | |
1382 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1383 | return 0; | |
1384 | ||
1385 | /* first, find out the vid. */ | |
0d125074 | 1386 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1387 | return 0; |
1388 | ||
c018ad3d | 1389 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1390 | |
1391 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1392 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1393 | orig_node->orig, vid); | |
23721387 SW |
1394 | if (!backbone_gw) |
1395 | return 0; | |
1396 | ||
3b300de3 | 1397 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1398 | return 1; |
1399 | } | |
1400 | ||
1401 | /* free all bla structures (for softinterface free or module unload) */ | |
56303d34 | 1402 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1403 | { |
56303d34 | 1404 | struct batadv_hard_iface *primary_if; |
23721387 | 1405 | |
807736f6 | 1406 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1407 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1408 | |
807736f6 | 1409 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1410 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1411 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1412 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1413 | } |
807736f6 | 1414 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1415 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1416 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1417 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1418 | } |
1419 | if (primary_if) | |
e5d89254 | 1420 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1421 | } |
1422 | ||
2c53040f BH |
1423 | /** |
1424 | * batadv_bla_rx | |
1425 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1426 | * @skb: the frame to be checked |
1427 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1428 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 SW |
1429 | * |
1430 | * bla_rx avoidance checks if: | |
1431 | * * we have to race for a claim | |
1432 | * * if the frame is allowed on the LAN | |
1433 | * | |
1434 | * in these cases, the skb is further handled by this function and | |
1435 | * returns 1, otherwise it returns 0 and the caller shall further | |
1436 | * process the skb. | |
23721387 | 1437 | */ |
eb2deb6b AQ |
1438 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1439 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1440 | { |
1441 | struct ethhdr *ethhdr; | |
712bbfe4 | 1442 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1443 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1444 | int ret; |
1445 | ||
7ed4be95 | 1446 | ethhdr = eth_hdr(skb); |
23721387 | 1447 | |
e5d89254 | 1448 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1449 | if (!primary_if) |
1450 | goto handled; | |
1451 | ||
1452 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1453 | goto allow; | |
1454 | ||
1455 | ||
807736f6 | 1456 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1457 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1458 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1459 | goto handled; |
1460 | ||
1461 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1462 | search_claim.vid = vid; | |
3b300de3 | 1463 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1464 | |
1465 | if (!claim) { | |
1466 | /* possible optimization: race for a claim */ | |
1467 | /* No claim exists yet, claim it for us! | |
1468 | */ | |
3b300de3 SE |
1469 | batadv_handle_claim(bat_priv, primary_if, |
1470 | primary_if->net_dev->dev_addr, | |
1471 | ethhdr->h_source, vid); | |
23721387 SW |
1472 | goto allow; |
1473 | } | |
1474 | ||
1475 | /* if it is our own claim ... */ | |
1eda58bf SE |
1476 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1477 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1478 | /* ... allow it in any case */ |
1479 | claim->lasttime = jiffies; | |
1480 | goto allow; | |
1481 | } | |
1482 | ||
1483 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1484 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1485 | /* ... drop it. the responsible gateway is in charge. | |
1486 | * | |
1487 | * We need to check is_bcast because with the gateway | |
1488 | * feature, broadcasts (like DHCP requests) may be sent | |
1489 | * using a unicast packet type. | |
1490 | */ | |
23721387 SW |
1491 | goto handled; |
1492 | } else { | |
1493 | /* seems the client considers us as its best gateway. | |
1494 | * send a claim and update the claim table | |
1495 | * immediately. | |
1496 | */ | |
3b300de3 SE |
1497 | batadv_handle_claim(bat_priv, primary_if, |
1498 | primary_if->net_dev->dev_addr, | |
1499 | ethhdr->h_source, vid); | |
23721387 SW |
1500 | goto allow; |
1501 | } | |
1502 | allow: | |
3b300de3 | 1503 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1504 | ret = 0; |
1505 | goto out; | |
1506 | ||
1507 | handled: | |
1508 | kfree_skb(skb); | |
1509 | ret = 1; | |
1510 | ||
1511 | out: | |
1512 | if (primary_if) | |
e5d89254 | 1513 | batadv_hardif_free_ref(primary_if); |
23721387 | 1514 | if (claim) |
3b300de3 | 1515 | batadv_claim_free_ref(claim); |
23721387 SW |
1516 | return ret; |
1517 | } | |
1518 | ||
2c53040f BH |
1519 | /** |
1520 | * batadv_bla_tx | |
1521 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
1522 | * @skb: the frame to be checked |
1523 | * @vid: the VLAN ID of the frame | |
1524 | * | |
1525 | * bla_tx checks if: | |
1526 | * * a claim was received which has to be processed | |
1527 | * * the frame is allowed on the mesh | |
1528 | * | |
1529 | * in these cases, the skb is further handled by this function and | |
1530 | * returns 1, otherwise it returns 0 and the caller shall further | |
1531 | * process the skb. | |
9d2c9488 LL |
1532 | * |
1533 | * This call might reallocate skb data. | |
23721387 | 1534 | */ |
eb2deb6b AQ |
1535 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1536 | unsigned short vid) | |
23721387 SW |
1537 | { |
1538 | struct ethhdr *ethhdr; | |
712bbfe4 | 1539 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1540 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1541 | int ret = 0; |
1542 | ||
e5d89254 | 1543 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1544 | if (!primary_if) |
1545 | goto out; | |
1546 | ||
1547 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1548 | goto allow; | |
1549 | ||
1550 | /* in VLAN case, the mac header might not be set. */ | |
1551 | skb_reset_mac_header(skb); | |
1552 | ||
3b300de3 | 1553 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1554 | goto handled; |
1555 | ||
7ed4be95 | 1556 | ethhdr = eth_hdr(skb); |
23721387 | 1557 | |
807736f6 | 1558 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1559 | /* don't allow broadcasts while requests are in flight */ |
1560 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1561 | goto handled; | |
1562 | ||
1563 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1564 | search_claim.vid = vid; | |
1565 | ||
3b300de3 | 1566 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1567 | |
1568 | /* if no claim exists, allow it. */ | |
1569 | if (!claim) | |
1570 | goto allow; | |
1571 | ||
1572 | /* check if we are responsible. */ | |
1eda58bf SE |
1573 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1574 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1575 | /* if yes, the client has roamed and we have |
1576 | * to unclaim it. | |
1577 | */ | |
3b300de3 SE |
1578 | batadv_handle_unclaim(bat_priv, primary_if, |
1579 | primary_if->net_dev->dev_addr, | |
1580 | ethhdr->h_source, vid); | |
23721387 SW |
1581 | goto allow; |
1582 | } | |
1583 | ||
1584 | /* check if it is a multicast/broadcast frame */ | |
1585 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1586 | /* drop it. the responsible gateway has forwarded it into | |
1587 | * the backbone network. | |
1588 | */ | |
1589 | goto handled; | |
1590 | } else { | |
1591 | /* we must allow it. at least if we are | |
1592 | * responsible for the DESTINATION. | |
1593 | */ | |
1594 | goto allow; | |
1595 | } | |
1596 | allow: | |
3b300de3 | 1597 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1598 | ret = 0; |
1599 | goto out; | |
1600 | handled: | |
1601 | ret = 1; | |
1602 | out: | |
1603 | if (primary_if) | |
e5d89254 | 1604 | batadv_hardif_free_ref(primary_if); |
23721387 | 1605 | if (claim) |
3b300de3 | 1606 | batadv_claim_free_ref(claim); |
23721387 SW |
1607 | return ret; |
1608 | } | |
9bf8e4d4 | 1609 | |
08adf151 | 1610 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1611 | { |
1612 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1613 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1614 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1615 | struct batadv_bla_claim *claim; |
56303d34 | 1616 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 SW |
1617 | struct hlist_head *head; |
1618 | uint32_t i; | |
1619 | bool is_own; | |
1eda58bf | 1620 | uint8_t *primary_addr; |
9bf8e4d4 | 1621 | |
30da63a6 ML |
1622 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1623 | if (!primary_if) | |
9bf8e4d4 | 1624 | goto out; |
9bf8e4d4 | 1625 | |
1eda58bf | 1626 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1627 | seq_printf(seq, |
39a32991 | 1628 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1629 | net_dev->name, primary_addr, |
807736f6 | 1630 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1631 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1632 | "Client", "VID", "Originator", "CRC"); |
1633 | for (i = 0; i < hash->size; i++) { | |
1634 | head = &hash->table[i]; | |
1635 | ||
1636 | rcu_read_lock(); | |
b67bfe0d | 1637 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1638 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1639 | primary_addr); | |
eb2deb6b | 1640 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1641 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1642 | claim->backbone_gw->orig, |
1643 | (is_own ? 'x' : ' '), | |
1644 | claim->backbone_gw->crc); | |
1645 | } | |
1646 | rcu_read_unlock(); | |
1647 | } | |
1648 | out: | |
1649 | if (primary_if) | |
e5d89254 | 1650 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1651 | return 0; |
9bf8e4d4 | 1652 | } |
536a23f1 SW |
1653 | |
1654 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) | |
1655 | { | |
1656 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1657 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1658 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1659 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1660 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1661 | struct hlist_head *head; |
1662 | int secs, msecs; | |
1663 | uint32_t i; | |
1664 | bool is_own; | |
536a23f1 SW |
1665 | uint8_t *primary_addr; |
1666 | ||
30da63a6 ML |
1667 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1668 | if (!primary_if) | |
536a23f1 | 1669 | goto out; |
536a23f1 SW |
1670 | |
1671 | primary_addr = primary_if->net_dev->dev_addr; | |
1672 | seq_printf(seq, | |
39a32991 | 1673 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1674 | net_dev->name, primary_addr, |
807736f6 | 1675 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1676 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1677 | "Originator", "VID", "last seen", "CRC"); |
1678 | for (i = 0; i < hash->size; i++) { | |
1679 | head = &hash->table[i]; | |
1680 | ||
1681 | rcu_read_lock(); | |
b67bfe0d | 1682 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1683 | msecs = jiffies_to_msecs(jiffies - |
1684 | backbone_gw->lasttime); | |
1685 | secs = msecs / 1000; | |
1686 | msecs = msecs % 1000; | |
1687 | ||
1688 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1689 | primary_addr); | |
1690 | if (is_own) | |
1691 | continue; | |
1692 | ||
eb2deb6b | 1693 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1694 | backbone_gw->orig, |
1695 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
eb2deb6b | 1696 | msecs, backbone_gw->crc); |
536a23f1 SW |
1697 | } |
1698 | rcu_read_unlock(); | |
1699 | } | |
1700 | out: | |
1701 | if (primary_if) | |
1702 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1703 | return 0; |
536a23f1 | 1704 | } |