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0046b040 | 1 | /* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: |
23721387 SW |
2 | * |
3 | * Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23721387 SW |
16 | */ |
17 | ||
23721387 | 18 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 19 | #include "main.h" |
23721387 | 20 | |
1e2c2a4f SE |
21 | #include <linux/atomic.h> |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
23721387 | 24 | #include <linux/crc16.h> |
1e2c2a4f SE |
25 | #include <linux/errno.h> |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
23721387 | 28 | #include <linux/if_arp.h> |
1e2c2a4f | 29 | #include <linux/if_ether.h> |
23721387 | 30 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
31 | #include <linux/jhash.h> |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/kernel.h> | |
06e56ded | 34 | #include <linux/kref.h> |
1e2c2a4f SE |
35 | #include <linux/list.h> |
36 | #include <linux/lockdep.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/rculist.h> | |
39 | #include <linux/rcupdate.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/skbuff.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/spinlock.h> | |
44 | #include <linux/stddef.h> | |
45 | #include <linux/string.h> | |
46 | #include <linux/workqueue.h> | |
47 | #include <net/arp.h> | |
48 | ||
49 | #include "hard-interface.h" | |
50 | #include "hash.h" | |
ba412080 | 51 | #include "log.h" |
1e2c2a4f SE |
52 | #include "originator.h" |
53 | #include "packet.h" | |
cd9c7bfb | 54 | #include "sysfs.h" |
1e2c2a4f | 55 | #include "translation-table.h" |
23721387 | 56 | |
6b5e971a | 57 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 58 | |
3b300de3 | 59 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
60 | static void |
61 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
62 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 63 | |
62fe710f | 64 | /** |
04e14be6 SW |
65 | * batadv_choose_claim - choose the right bucket for a claim. |
66 | * @data: data to hash | |
67 | * @size: size of the hash table | |
62fe710f | 68 | * |
04e14be6 | 69 | * Return: the hash index of the claim |
62fe710f | 70 | */ |
6b5e971a | 71 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 72 | { |
712bbfe4 | 73 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 74 | u32 hash = 0; |
23721387 | 75 | |
36fd61cb SE |
76 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
77 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
78 | |
79 | return hash % size; | |
80 | } | |
81 | ||
62fe710f | 82 | /** |
04e14be6 SW |
83 | * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway. |
84 | * @data: data to hash | |
85 | * @size: size of the hash table | |
62fe710f | 86 | * |
04e14be6 | 87 | * Return: the hash index of the backbone gateway |
62fe710f | 88 | */ |
6b5e971a | 89 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 90 | { |
712bbfe4 | 91 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 92 | u32 hash = 0; |
23721387 | 93 | |
36fd61cb SE |
94 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
95 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
96 | |
97 | return hash % size; | |
98 | } | |
99 | ||
04e14be6 SW |
100 | /** |
101 | * batadv_compare_backbone_gw - compare address and vid of two backbone gws | |
102 | * @node: list node of the first entry to compare | |
103 | * @data2: pointer to the second backbone gateway | |
104 | * | |
4b426b10 | 105 | * Return: true if the backbones have the same data, false otherwise |
04e14be6 | 106 | */ |
4b426b10 SE |
107 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
108 | const void *data2) | |
23721387 | 109 | { |
bae98774 | 110 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 111 | hash_entry); |
4f248cff SE |
112 | const struct batadv_bla_backbone_gw *gw1 = data1; |
113 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 114 | |
c76d1525 | 115 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
4b426b10 | 116 | return false; |
c76d1525 SW |
117 | |
118 | if (gw1->vid != gw2->vid) | |
4b426b10 | 119 | return false; |
c76d1525 | 120 | |
4b426b10 | 121 | return true; |
23721387 SW |
122 | } |
123 | ||
04e14be6 | 124 | /** |
98a5b1d8 | 125 | * batadv_compare_claim - compare address and vid of two claims |
04e14be6 SW |
126 | * @node: list node of the first entry to compare |
127 | * @data2: pointer to the second claims | |
128 | * | |
4b426b10 | 129 | * Return: true if the claim have the same data, 0 otherwise |
04e14be6 | 130 | */ |
4b426b10 SE |
131 | static bool batadv_compare_claim(const struct hlist_node *node, |
132 | const void *data2) | |
23721387 | 133 | { |
712bbfe4 | 134 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 135 | hash_entry); |
4f248cff SE |
136 | const struct batadv_bla_claim *cl1 = data1; |
137 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
138 | |
139 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
4b426b10 | 140 | return false; |
c76d1525 SW |
141 | |
142 | if (cl1->vid != cl2->vid) | |
4b426b10 | 143 | return false; |
23721387 | 144 | |
4b426b10 | 145 | return true; |
23721387 SW |
146 | } |
147 | ||
04e14be6 | 148 | /** |
06e56ded SE |
149 | * batadv_backbone_gw_release - release backbone gw from lists and queue for |
150 | * free after rcu grace period | |
151 | * @ref: kref pointer of the backbone gw | |
152 | */ | |
153 | static void batadv_backbone_gw_release(struct kref *ref) | |
154 | { | |
155 | struct batadv_bla_backbone_gw *backbone_gw; | |
156 | ||
157 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
158 | refcount); | |
159 | ||
160 | kfree_rcu(backbone_gw, rcu); | |
161 | } | |
162 | ||
163 | /** | |
c8b86c12 SE |
164 | * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly |
165 | * release it | |
04e14be6 SW |
166 | * @backbone_gw: backbone gateway to be free'd |
167 | */ | |
c8b86c12 | 168 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 169 | { |
06e56ded | 170 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
171 | } |
172 | ||
04e14be6 SW |
173 | /** |
174 | * batadv_claim_release - release claim from lists and queue for free after rcu | |
175 | * grace period | |
176 | * @ref: kref pointer of the claim | |
177 | */ | |
71b7e3d3 | 178 | static void batadv_claim_release(struct kref *ref) |
23721387 | 179 | { |
71b7e3d3 SE |
180 | struct batadv_bla_claim *claim; |
181 | ||
182 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
183 | ||
c8b86c12 | 184 | batadv_backbone_gw_put(claim->backbone_gw); |
63b39927 | 185 | kfree_rcu(claim, rcu); |
23721387 SW |
186 | } |
187 | ||
04e14be6 | 188 | /** |
321e3e08 | 189 | * batadv_claim_put - decrement the claim refcounter and possibly |
ec9b83ca | 190 | * release it |
04e14be6 SW |
191 | * @claim: claim to be free'd |
192 | */ | |
321e3e08 | 193 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
23721387 | 194 | { |
71b7e3d3 | 195 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
196 | } |
197 | ||
1b371d13 | 198 | /** |
04e14be6 | 199 | * batadv_claim_hash_find - looks for a claim in the claim hash |
1b371d13 | 200 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
201 | * @data: search data (may be local/static data) |
202 | * | |
62fe710f | 203 | * Return: claim if found or NULL otherwise. |
23721387 | 204 | */ |
6fc77a54 SE |
205 | static struct batadv_bla_claim * |
206 | batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
207 | struct batadv_bla_claim *data) | |
23721387 | 208 | { |
807736f6 | 209 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 210 | struct hlist_head *head; |
712bbfe4 ML |
211 | struct batadv_bla_claim *claim; |
212 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
213 | int index; |
214 | ||
215 | if (!hash) | |
216 | return NULL; | |
217 | ||
3b300de3 | 218 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
219 | head = &hash->table[index]; |
220 | ||
221 | rcu_read_lock(); | |
b67bfe0d | 222 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 223 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
224 | continue; |
225 | ||
71b7e3d3 | 226 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
227 | continue; |
228 | ||
229 | claim_tmp = claim; | |
230 | break; | |
231 | } | |
232 | rcu_read_unlock(); | |
233 | ||
234 | return claim_tmp; | |
235 | } | |
236 | ||
2c53040f | 237 | /** |
04e14be6 | 238 | * batadv_backbone_hash_find - looks for a backbone gateway in the hash |
2c53040f | 239 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
240 | * @addr: the address of the originator |
241 | * @vid: the VLAN ID | |
242 | * | |
04e14be6 | 243 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 244 | */ |
bae98774 | 245 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
246 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
247 | unsigned short vid) | |
23721387 | 248 | { |
807736f6 | 249 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 250 | struct hlist_head *head; |
bae98774 ML |
251 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
252 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
253 | int index; |
254 | ||
255 | if (!hash) | |
256 | return NULL; | |
257 | ||
8fdd0153 | 258 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
259 | search_entry.vid = vid; |
260 | ||
3b300de3 | 261 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
262 | head = &hash->table[index]; |
263 | ||
264 | rcu_read_lock(); | |
b67bfe0d | 265 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
266 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
267 | &search_entry)) | |
23721387 SW |
268 | continue; |
269 | ||
06e56ded | 270 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
271 | continue; |
272 | ||
273 | backbone_gw_tmp = backbone_gw; | |
274 | break; | |
275 | } | |
276 | rcu_read_unlock(); | |
277 | ||
278 | return backbone_gw_tmp; | |
279 | } | |
280 | ||
04e14be6 SW |
281 | /** |
282 | * batadv_bla_del_backbone_claims - delete all claims for a backbone | |
283 | * @backbone_gw: backbone gateway where the claims should be removed | |
284 | */ | |
56303d34 | 285 | static void |
bae98774 | 286 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 287 | { |
5bf74e9c | 288 | struct batadv_hashtable *hash; |
b67bfe0d | 289 | struct hlist_node *node_tmp; |
23721387 | 290 | struct hlist_head *head; |
712bbfe4 | 291 | struct batadv_bla_claim *claim; |
23721387 SW |
292 | int i; |
293 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
294 | ||
807736f6 | 295 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
296 | if (!hash) |
297 | return; | |
298 | ||
299 | for (i = 0; i < hash->size; i++) { | |
300 | head = &hash->table[i]; | |
301 | list_lock = &hash->list_locks[i]; | |
302 | ||
303 | spin_lock_bh(list_lock); | |
b67bfe0d | 304 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 305 | head, hash_entry) { |
23721387 SW |
306 | if (claim->backbone_gw != backbone_gw) |
307 | continue; | |
308 | ||
321e3e08 | 309 | batadv_claim_put(claim); |
b67bfe0d | 310 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
311 | } |
312 | spin_unlock_bh(list_lock); | |
313 | } | |
314 | ||
3f68785e | 315 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 316 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 317 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 318 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
319 | } |
320 | ||
2c53040f BH |
321 | /** |
322 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
323 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 324 | * @mac: the mac address to be announced within the claim |
23721387 SW |
325 | * @vid: the VLAN ID |
326 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 327 | */ |
6b5e971a | 328 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 329 | unsigned short vid, int claimtype) |
23721387 SW |
330 | { |
331 | struct sk_buff *skb; | |
332 | struct ethhdr *ethhdr; | |
56303d34 | 333 | struct batadv_hard_iface *primary_if; |
23721387 | 334 | struct net_device *soft_iface; |
6b5e971a | 335 | u8 *hw_src; |
96412690 | 336 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 337 | __be32 zeroip = 0; |
23721387 | 338 | |
e5d89254 | 339 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
340 | if (!primary_if) |
341 | return; | |
342 | ||
807736f6 | 343 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 344 | sizeof(local_claim_dest)); |
23721387 SW |
345 | local_claim_dest.type = claimtype; |
346 | ||
347 | soft_iface = primary_if->soft_iface; | |
348 | ||
349 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
350 | /* IP DST: 0.0.0.0 */ | |
351 | zeroip, | |
352 | primary_if->soft_iface, | |
353 | /* IP SRC: 0.0.0.0 */ | |
354 | zeroip, | |
355 | /* Ethernet DST: Broadcast */ | |
356 | NULL, | |
357 | /* Ethernet SRC/HW SRC: originator mac */ | |
358 | primary_if->net_dev->dev_addr, | |
99e966fc | 359 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 360 | * with XX = claim type |
38ef3d1d | 361 | * and YY:YY = group id |
23721387 | 362 | */ |
6b5e971a | 363 | (u8 *)&local_claim_dest); |
23721387 SW |
364 | |
365 | if (!skb) | |
366 | goto out; | |
367 | ||
368 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 369 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
370 | |
371 | /* now we pretend that the client would have sent this ... */ | |
372 | switch (claimtype) { | |
3eb8773e | 373 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
374 | /* normal claim frame |
375 | * set Ethernet SRC to the clients mac | |
376 | */ | |
8fdd0153 | 377 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 378 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
379 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
380 | BATADV_PRINT_VID(vid)); | |
23721387 | 381 | break; |
3eb8773e | 382 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
383 | /* unclaim frame |
384 | * set HW SRC to the clients mac | |
385 | */ | |
8fdd0153 | 386 | ether_addr_copy(hw_src, mac); |
39c75a51 | 387 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 388 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 389 | BATADV_PRINT_VID(vid)); |
23721387 | 390 | break; |
acd34afa | 391 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
392 | /* announcement frame |
393 | * set HW SRC to the special mac containg the crc | |
394 | */ | |
8fdd0153 | 395 | ether_addr_copy(hw_src, mac); |
39c75a51 | 396 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 397 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 398 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 399 | break; |
acd34afa | 400 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 401 | /* request frame |
99e966fc SW |
402 | * set HW SRC and header destination to the receiving backbone |
403 | * gws mac | |
23721387 | 404 | */ |
8fdd0153 AQ |
405 | ether_addr_copy(hw_src, mac); |
406 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 407 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 408 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
409 | ethhdr->h_source, ethhdr->h_dest, |
410 | BATADV_PRINT_VID(vid)); | |
23721387 | 411 | break; |
cd9c7bfb SW |
412 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
413 | ether_addr_copy(ethhdr->h_source, mac); | |
414 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
415 | "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n", | |
416 | ethhdr->h_source, ethhdr->h_dest, | |
417 | BATADV_PRINT_VID(vid)); | |
418 | ||
419 | break; | |
23721387 SW |
420 | } |
421 | ||
eb2deb6b AQ |
422 | if (vid & BATADV_VLAN_HAS_TAG) |
423 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
424 | vid & VLAN_VID_MASK); | |
23721387 SW |
425 | |
426 | skb_reset_mac_header(skb); | |
427 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
428 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
429 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
430 | skb->len + ETH_HLEN); | |
23721387 SW |
431 | soft_iface->last_rx = jiffies; |
432 | ||
433 | netif_rx(skb); | |
434 | out: | |
435 | if (primary_if) | |
82047ad7 | 436 | batadv_hardif_put(primary_if); |
23721387 SW |
437 | } |
438 | ||
cd9c7bfb SW |
439 | /** |
440 | * batadv_bla_loopdetect_report - worker for reporting the loop | |
441 | * @work: work queue item | |
442 | * | |
443 | * Throws an uevent, as the loopdetect check function can't do that itself | |
444 | * since the kernel may sleep while throwing uevents. | |
445 | */ | |
446 | static void batadv_bla_loopdetect_report(struct work_struct *work) | |
447 | { | |
448 | struct batadv_bla_backbone_gw *backbone_gw; | |
449 | struct batadv_priv *bat_priv; | |
450 | char vid_str[6] = { '\0' }; | |
451 | ||
452 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, | |
453 | report_work); | |
454 | bat_priv = backbone_gw->bat_priv; | |
455 | ||
456 | batadv_info(bat_priv->soft_iface, | |
457 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", | |
458 | BATADV_PRINT_VID(backbone_gw->vid)); | |
459 | snprintf(vid_str, sizeof(vid_str), "%d", | |
460 | BATADV_PRINT_VID(backbone_gw->vid)); | |
461 | vid_str[sizeof(vid_str) - 1] = 0; | |
462 | ||
463 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, | |
464 | vid_str); | |
465 | ||
466 | batadv_backbone_gw_put(backbone_gw); | |
467 | } | |
468 | ||
2c53040f | 469 | /** |
04e14be6 | 470 | * batadv_bla_get_backbone_gw - finds or creates a backbone gateway |
2c53040f | 471 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
472 | * @orig: the mac address of the originator |
473 | * @vid: the VLAN ID | |
e3357189 | 474 | * @own_backbone: set if the requested backbone is local |
23721387 | 475 | * |
04e14be6 | 476 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 477 | */ |
bae98774 | 478 | static struct batadv_bla_backbone_gw * |
6b5e971a | 479 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 480 | unsigned short vid, bool own_backbone) |
23721387 | 481 | { |
bae98774 | 482 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 483 | struct batadv_orig_node *orig_node; |
23721387 SW |
484 | int hash_added; |
485 | ||
3b300de3 | 486 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
487 | |
488 | if (entry) | |
489 | return entry; | |
490 | ||
39c75a51 | 491 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 492 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 493 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
494 | |
495 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
496 | if (!entry) | |
497 | return NULL; | |
498 | ||
499 | entry->vid = vid; | |
500 | entry->lasttime = jiffies; | |
3964f728 | 501 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 502 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 503 | spin_lock_init(&entry->crc_lock); |
23721387 | 504 | atomic_set(&entry->request_sent, 0); |
28709878 | 505 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 506 | ether_addr_copy(entry->orig, orig); |
cd9c7bfb | 507 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
23721387 SW |
508 | |
509 | /* one for the hash, one for returning */ | |
06e56ded SE |
510 | kref_init(&entry->refcount); |
511 | kref_get(&entry->refcount); | |
23721387 | 512 | |
807736f6 | 513 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
514 | batadv_compare_backbone_gw, |
515 | batadv_choose_backbone_gw, entry, | |
516 | &entry->hash_entry); | |
23721387 SW |
517 | |
518 | if (unlikely(hash_added != 0)) { | |
519 | /* hash failed, free the structure */ | |
520 | kfree(entry); | |
521 | return NULL; | |
522 | } | |
523 | ||
95fb130d | 524 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 525 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 526 | if (orig_node) { |
95fb130d | 527 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 528 | "became a backbone gateway"); |
5d967310 | 529 | batadv_orig_node_put(orig_node); |
20ff9d59 | 530 | } |
52aebd6a | 531 | |
d807f272 | 532 | if (own_backbone) { |
52aebd6a SW |
533 | batadv_bla_send_announce(bat_priv, entry); |
534 | ||
d807f272 SW |
535 | /* this will be decreased in the worker thread */ |
536 | atomic_inc(&entry->request_sent); | |
28709878 | 537 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
538 | atomic_inc(&bat_priv->bla.num_requests); |
539 | } | |
540 | ||
23721387 SW |
541 | return entry; |
542 | } | |
543 | ||
04e14be6 SW |
544 | /** |
545 | * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN | |
546 | * @bat_priv: the bat priv with all the soft interface information | |
547 | * @primary_if: the selected primary interface | |
548 | * @vid: VLAN identifier | |
549 | * | |
550 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
551 | * where we receive other backbone gws |
552 | */ | |
56303d34 SE |
553 | static void |
554 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
555 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 556 | unsigned short vid) |
23721387 | 557 | { |
bae98774 | 558 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 559 | |
3b300de3 SE |
560 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
561 | primary_if->net_dev->dev_addr, | |
52aebd6a | 562 | vid, true); |
23721387 SW |
563 | if (unlikely(!backbone_gw)) |
564 | return; | |
565 | ||
566 | backbone_gw->lasttime = jiffies; | |
c8b86c12 | 567 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
568 | } |
569 | ||
1b371d13 SW |
570 | /** |
571 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
572 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 573 | * @primary_if: interface where the request came on |
23721387 SW |
574 | * @vid: the vid where the request came on |
575 | * | |
576 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
577 | * to allow the requester another check if the CRC is correct now. | |
578 | */ | |
56303d34 SE |
579 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
580 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 581 | unsigned short vid) |
23721387 | 582 | { |
23721387 | 583 | struct hlist_head *head; |
5bf74e9c | 584 | struct batadv_hashtable *hash; |
712bbfe4 | 585 | struct batadv_bla_claim *claim; |
bae98774 | 586 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
587 | int i; |
588 | ||
39c75a51 | 589 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 590 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 591 | |
3b300de3 SE |
592 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
593 | primary_if->net_dev->dev_addr, | |
594 | vid); | |
23721387 SW |
595 | if (!backbone_gw) |
596 | return; | |
597 | ||
807736f6 | 598 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
599 | for (i = 0; i < hash->size; i++) { |
600 | head = &hash->table[i]; | |
601 | ||
602 | rcu_read_lock(); | |
b67bfe0d | 603 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
604 | /* only own claims are interesting */ |
605 | if (claim->backbone_gw != backbone_gw) | |
606 | continue; | |
607 | ||
3b300de3 | 608 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 609 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
610 | } |
611 | rcu_read_unlock(); | |
612 | } | |
613 | ||
614 | /* finally, send an announcement frame */ | |
3b300de3 | 615 | batadv_bla_send_announce(bat_priv, backbone_gw); |
c8b86c12 | 616 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
617 | } |
618 | ||
1b371d13 SW |
619 | /** |
620 | * batadv_bla_send_request - send a request to repeat claims | |
621 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
622 | * |
623 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
624 | * After the request, it will repeat all of his own claims and finally | |
625 | * send an announcement claim with which we can check again. | |
626 | */ | |
bae98774 | 627 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
628 | { |
629 | /* first, remove all old entries */ | |
3b300de3 | 630 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 631 | |
39c75a51 SE |
632 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
633 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
634 | |
635 | /* send request */ | |
3b300de3 | 636 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 637 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
638 | |
639 | /* no local broadcasts should be sent or received, for now. */ | |
640 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 641 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
642 | atomic_set(&backbone_gw->request_sent, 1); |
643 | } | |
644 | } | |
645 | ||
1b371d13 | 646 | /** |
04e14be6 | 647 | * batadv_bla_send_announce - Send an announcement frame |
1b371d13 | 648 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 649 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 650 | */ |
56303d34 | 651 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 652 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 653 | { |
6b5e971a | 654 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 655 | __be16 crc; |
23721387 | 656 | |
3b300de3 | 657 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 658 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 659 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 660 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 661 | memcpy(&mac[4], &crc, 2); |
23721387 | 662 | |
3b300de3 | 663 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 664 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
665 | } |
666 | ||
2c53040f BH |
667 | /** |
668 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
669 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
670 | * @mac: the mac address of the claim |
671 | * @vid: the VLAN ID of the frame | |
672 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 673 | */ |
56303d34 | 674 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 675 | const u8 *mac, const unsigned short vid, |
bae98774 | 676 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 677 | { |
712bbfe4 ML |
678 | struct batadv_bla_claim *claim; |
679 | struct batadv_bla_claim search_claim; | |
23721387 SW |
680 | int hash_added; |
681 | ||
8fdd0153 | 682 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 683 | search_claim.vid = vid; |
3b300de3 | 684 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
685 | |
686 | /* create a new claim entry if it does not exist yet. */ | |
687 | if (!claim) { | |
688 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
689 | if (!claim) | |
690 | return; | |
691 | ||
8fdd0153 | 692 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
693 | claim->vid = vid; |
694 | claim->lasttime = jiffies; | |
695 | claim->backbone_gw = backbone_gw; | |
696 | ||
71b7e3d3 SE |
697 | kref_init(&claim->refcount); |
698 | kref_get(&claim->refcount); | |
39c75a51 | 699 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 700 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 701 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 702 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
703 | batadv_compare_claim, |
704 | batadv_choose_claim, claim, | |
705 | &claim->hash_entry); | |
23721387 SW |
706 | |
707 | if (unlikely(hash_added != 0)) { | |
708 | /* only local changes happened. */ | |
709 | kfree(claim); | |
710 | return; | |
711 | } | |
712 | } else { | |
713 | claim->lasttime = jiffies; | |
714 | if (claim->backbone_gw == backbone_gw) | |
715 | /* no need to register a new backbone */ | |
716 | goto claim_free_ref; | |
717 | ||
39c75a51 | 718 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 719 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 720 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 721 | |
5a1dd8a4 | 722 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
bbb1f90e | 723 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 724 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
c8b86c12 | 725 | batadv_backbone_gw_put(claim->backbone_gw); |
23721387 SW |
726 | } |
727 | /* set (new) backbone gw */ | |
06e56ded | 728 | kref_get(&backbone_gw->refcount); |
23721387 SW |
729 | claim->backbone_gw = backbone_gw; |
730 | ||
5a1dd8a4 | 731 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 732 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 733 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
734 | backbone_gw->lasttime = jiffies; |
735 | ||
736 | claim_free_ref: | |
321e3e08 | 737 | batadv_claim_put(claim); |
23721387 SW |
738 | } |
739 | ||
04e14be6 SW |
740 | /** |
741 | * batadv_bla_del_claim - delete a claim from the claim hash | |
742 | * @bat_priv: the bat priv with all the soft interface information | |
743 | * @mac: mac address of the claim to be removed | |
744 | * @vid: VLAN id for the claim to be removed | |
23721387 | 745 | */ |
56303d34 | 746 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 747 | const u8 *mac, const unsigned short vid) |
23721387 | 748 | { |
712bbfe4 | 749 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 750 | |
8fdd0153 | 751 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 752 | search_claim.vid = vid; |
3b300de3 | 753 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
754 | if (!claim) |
755 | return; | |
756 | ||
39c75a51 | 757 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 758 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 759 | |
807736f6 | 760 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 | 761 | batadv_choose_claim, claim); |
321e3e08 | 762 | batadv_claim_put(claim); /* reference from the hash is gone */ |
23721387 | 763 | |
5a1dd8a4 | 764 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
23721387 | 765 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 766 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
23721387 SW |
767 | |
768 | /* don't need the reference from hash_find() anymore */ | |
321e3e08 | 769 | batadv_claim_put(claim); |
23721387 SW |
770 | } |
771 | ||
62fe710f SE |
772 | /** |
773 | * batadv_handle_announce - check for ANNOUNCE frame | |
04e14be6 SW |
774 | * @bat_priv: the bat priv with all the soft interface information |
775 | * @an_addr: announcement mac address (ARP Sender HW address) | |
776 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
777 | * @vid: the VLAN ID of the frame | |
62fe710f | 778 | * |
4b426b10 | 779 | * Return: true if handled |
62fe710f | 780 | */ |
4b426b10 SE |
781 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
782 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 783 | { |
bae98774 | 784 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 785 | u16 backbone_crc, crc; |
23721387 | 786 | |
3b300de3 | 787 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
4b426b10 | 788 | return false; |
23721387 | 789 | |
52aebd6a SW |
790 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
791 | false); | |
23721387 SW |
792 | |
793 | if (unlikely(!backbone_gw)) | |
4b426b10 | 794 | return true; |
23721387 | 795 | |
23721387 SW |
796 | /* handle as ANNOUNCE frame */ |
797 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 798 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 799 | |
39c75a51 | 800 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 801 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 802 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 803 | |
5a1dd8a4 SW |
804 | spin_lock_bh(&backbone_gw->crc_lock); |
805 | backbone_crc = backbone_gw->crc; | |
806 | spin_unlock_bh(&backbone_gw->crc_lock); | |
807 | ||
808 | if (backbone_crc != crc) { | |
39c75a51 | 809 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 810 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
811 | backbone_gw->orig, |
812 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 813 | backbone_crc, crc); |
23721387 | 814 | |
3b300de3 | 815 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
816 | } else { |
817 | /* if we have sent a request and the crc was OK, | |
818 | * we can allow traffic again. | |
819 | */ | |
820 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 821 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
822 | atomic_set(&backbone_gw->request_sent, 0); |
823 | } | |
824 | } | |
825 | ||
c8b86c12 | 826 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 827 | return true; |
23721387 SW |
828 | } |
829 | ||
62fe710f SE |
830 | /** |
831 | * batadv_handle_request - check for REQUEST frame | |
04e14be6 SW |
832 | * @bat_priv: the bat priv with all the soft interface information |
833 | * @primary_if: the primary hard interface of this batman soft interface | |
834 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
835 | * @ethhdr: ethernet header of a packet | |
836 | * @vid: the VLAN ID of the frame | |
62fe710f | 837 | * |
4b426b10 | 838 | * Return: true if handled |
62fe710f | 839 | */ |
4b426b10 SE |
840 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
841 | struct batadv_hard_iface *primary_if, | |
842 | u8 *backbone_addr, struct ethhdr *ethhdr, | |
843 | unsigned short vid) | |
23721387 SW |
844 | { |
845 | /* check for REQUEST frame */ | |
1eda58bf | 846 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
4b426b10 | 847 | return false; |
23721387 SW |
848 | |
849 | /* sanity check, this should not happen on a normal switch, | |
850 | * we ignore it in this case. | |
851 | */ | |
1eda58bf | 852 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
4b426b10 | 853 | return true; |
23721387 | 854 | |
39c75a51 | 855 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 856 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 857 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 858 | |
3b300de3 | 859 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
4b426b10 | 860 | return true; |
23721387 SW |
861 | } |
862 | ||
62fe710f SE |
863 | /** |
864 | * batadv_handle_unclaim - check for UNCLAIM frame | |
04e14be6 SW |
865 | * @bat_priv: the bat priv with all the soft interface information |
866 | * @primary_if: the primary hard interface of this batman soft interface | |
867 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
868 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
869 | * @vid: the VLAN ID of the frame | |
62fe710f | 870 | * |
4b426b10 | 871 | * Return: true if handled |
62fe710f | 872 | */ |
4b426b10 SE |
873 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
874 | struct batadv_hard_iface *primary_if, | |
875 | u8 *backbone_addr, u8 *claim_addr, | |
876 | unsigned short vid) | |
23721387 | 877 | { |
bae98774 | 878 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
879 | |
880 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
881 | if (primary_if && batadv_compare_eth(backbone_addr, |
882 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 883 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 884 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 885 | |
3b300de3 | 886 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
887 | |
888 | if (!backbone_gw) | |
4b426b10 | 889 | return true; |
23721387 SW |
890 | |
891 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 892 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 893 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 894 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 895 | |
3b300de3 | 896 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
c8b86c12 | 897 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 898 | return true; |
23721387 SW |
899 | } |
900 | ||
62fe710f SE |
901 | /** |
902 | * batadv_handle_claim - check for CLAIM frame | |
04e14be6 SW |
903 | * @bat_priv: the bat priv with all the soft interface information |
904 | * @primary_if: the primary hard interface of this batman soft interface | |
905 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
906 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
907 | * @vid: the VLAN ID of the frame | |
62fe710f | 908 | * |
4b426b10 | 909 | * Return: true if handled |
62fe710f | 910 | */ |
4b426b10 SE |
911 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
912 | struct batadv_hard_iface *primary_if, | |
913 | u8 *backbone_addr, u8 *claim_addr, | |
914 | unsigned short vid) | |
23721387 | 915 | { |
bae98774 | 916 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
917 | |
918 | /* register the gateway if not yet available, and add the claim. */ | |
919 | ||
52aebd6a SW |
920 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
921 | false); | |
23721387 SW |
922 | |
923 | if (unlikely(!backbone_gw)) | |
4b426b10 | 924 | return true; |
23721387 SW |
925 | |
926 | /* this must be a CLAIM frame */ | |
3b300de3 | 927 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 928 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 929 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 930 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
931 | |
932 | /* TODO: we could call something like tt_local_del() here. */ | |
933 | ||
c8b86c12 | 934 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 935 | return true; |
23721387 SW |
936 | } |
937 | ||
2c53040f | 938 | /** |
04e14be6 | 939 | * batadv_check_claim_group - check for claim group membership |
2c53040f | 940 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 941 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
942 | * @hw_src: the Hardware source in the ARP Header |
943 | * @hw_dst: the Hardware destination in the ARP Header | |
944 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
945 | * | |
946 | * checks if it is a claim packet and if its on the same group. | |
947 | * This function also applies the group ID of the sender | |
948 | * if it is in the same mesh. | |
949 | * | |
62fe710f | 950 | * Return: |
38ef3d1d SW |
951 | * 2 - if it is a claim packet and on the same group |
952 | * 1 - if is a claim packet from another group | |
953 | * 0 - if it is not a claim packet | |
954 | */ | |
56303d34 SE |
955 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
956 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 957 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 958 | struct ethhdr *ethhdr) |
38ef3d1d | 959 | { |
6b5e971a | 960 | u8 *backbone_addr; |
56303d34 | 961 | struct batadv_orig_node *orig_node; |
96412690 | 962 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 963 | |
96412690 | 964 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 965 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 966 | |
38ef3d1d SW |
967 | /* if announcement packet, use the source, |
968 | * otherwise assume it is in the hw_src | |
969 | */ | |
970 | switch (bla_dst->type) { | |
3eb8773e | 971 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
972 | backbone_addr = hw_src; |
973 | break; | |
acd34afa SE |
974 | case BATADV_CLAIM_TYPE_REQUEST: |
975 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 976 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
977 | backbone_addr = ethhdr->h_source; |
978 | break; | |
979 | default: | |
980 | return 0; | |
981 | } | |
982 | ||
983 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 984 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
985 | return 0; |
986 | ||
987 | /* if its already the same group, it is fine. */ | |
988 | if (bla_dst->group == bla_dst_own->group) | |
989 | return 2; | |
990 | ||
991 | /* lets see if this originator is in our mesh */ | |
da641193 | 992 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
993 | |
994 | /* dont accept claims from gateways which are not in | |
995 | * the same mesh or group. | |
996 | */ | |
997 | if (!orig_node) | |
998 | return 1; | |
999 | ||
1000 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
1001 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 1002 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 1003 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 1004 | ntohs(bla_dst->group)); |
38ef3d1d SW |
1005 | bla_dst_own->group = bla_dst->group; |
1006 | } | |
1007 | ||
5d967310 | 1008 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
1009 | |
1010 | return 2; | |
1011 | } | |
1012 | ||
1b371d13 | 1013 | /** |
04e14be6 | 1014 | * batadv_bla_process_claim - Check if this is a claim frame, and process it |
1b371d13 | 1015 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 1016 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
1017 | * @skb: the frame to be checked |
1018 | * | |
4b426b10 | 1019 | * Return: true if it was a claim frame, otherwise return false to |
23721387 SW |
1020 | * tell the callee that it can use the frame on its own. |
1021 | */ | |
4b426b10 SE |
1022 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
1023 | struct batadv_hard_iface *primary_if, | |
1024 | struct sk_buff *skb) | |
23721387 | 1025 | { |
d46b6bfa | 1026 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 1027 | u8 *hw_src, *hw_dst; |
d46b6bfa | 1028 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 1029 | struct ethhdr *ethhdr; |
23721387 | 1030 | struct arphdr *arphdr; |
c018ad3d | 1031 | unsigned short vid; |
d46b6bfa | 1032 | int vlan_depth = 0; |
293e9338 | 1033 | __be16 proto; |
23721387 | 1034 | int headlen; |
38ef3d1d | 1035 | int ret; |
23721387 | 1036 | |
c018ad3d | 1037 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 1038 | ethhdr = eth_hdr(skb); |
23721387 | 1039 | |
c018ad3d AQ |
1040 | proto = ethhdr->h_proto; |
1041 | headlen = ETH_HLEN; | |
1042 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1043 | /* Traverse the VLAN/Ethertypes. |
1044 | * | |
1045 | * At this point it is known that the first protocol is a VLAN | |
1046 | * header, so start checking at the encapsulated protocol. | |
1047 | * | |
1048 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1049 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1050 | */ | |
1051 | do { | |
1052 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1053 | &vhdr_buf); | |
1054 | if (!vhdr) | |
4b426b10 | 1055 | return false; |
d46b6bfa SW |
1056 | |
1057 | proto = vhdr->h_vlan_encapsulated_proto; | |
1058 | headlen += VLAN_HLEN; | |
1059 | vlan_depth++; | |
1060 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1061 | } |
1062 | ||
293e9338 | 1063 | if (proto != htons(ETH_P_ARP)) |
4b426b10 | 1064 | return false; /* not a claim frame */ |
23721387 SW |
1065 | |
1066 | /* this must be a ARP frame. check if it is a claim. */ | |
1067 | ||
1068 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
4b426b10 | 1069 | return false; |
23721387 SW |
1070 | |
1071 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1072 | ethhdr = eth_hdr(skb); |
6b5e971a | 1073 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1074 | |
1075 | /* Check whether the ARP frame carries a valid | |
1076 | * IP information | |
1077 | */ | |
23721387 | 1078 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
4b426b10 | 1079 | return false; |
23721387 | 1080 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
4b426b10 | 1081 | return false; |
23721387 | 1082 | if (arphdr->ar_hln != ETH_ALEN) |
4b426b10 | 1083 | return false; |
23721387 | 1084 | if (arphdr->ar_pln != 4) |
4b426b10 | 1085 | return false; |
23721387 | 1086 | |
6b5e971a | 1087 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1088 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1089 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1090 | bla_dst_own = &bat_priv->bla.claim_dest; |
1091 | ||
1092 | /* check if it is a claim frame in general */ | |
1093 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1094 | sizeof(bla_dst->magic)) != 0) | |
4b426b10 | 1095 | return false; |
d46b6bfa SW |
1096 | |
1097 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1098 | * drop that, as this is not supported by BLA but should also not be | |
1099 | * sent via the mesh. | |
1100 | */ | |
1101 | if (vlan_depth > 1) | |
4b426b10 | 1102 | return true; |
23721387 | 1103 | |
cd9c7bfb SW |
1104 | /* Let the loopdetect frames on the mesh in any case. */ |
1105 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) | |
1106 | return 0; | |
1107 | ||
23721387 | 1108 | /* check if it is a claim frame. */ |
3b300de3 SE |
1109 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1110 | ethhdr); | |
38ef3d1d | 1111 | if (ret == 1) |
39c75a51 | 1112 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1113 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
1114 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
1115 | hw_dst); | |
38ef3d1d SW |
1116 | |
1117 | if (ret < 2) | |
4b426b10 | 1118 | return !!ret; |
23721387 SW |
1119 | |
1120 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1121 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1122 | |
1123 | /* check for the different types of claim frames ... */ | |
1124 | switch (bla_dst->type) { | |
3eb8773e | 1125 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1126 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1127 | ethhdr->h_source, vid)) | |
4b426b10 | 1128 | return true; |
23721387 | 1129 | break; |
3eb8773e | 1130 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1131 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1132 | ethhdr->h_source, hw_src, vid)) | |
4b426b10 | 1133 | return true; |
23721387 SW |
1134 | break; |
1135 | ||
acd34afa | 1136 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1137 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1138 | vid)) | |
4b426b10 | 1139 | return true; |
23721387 | 1140 | break; |
acd34afa | 1141 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1142 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1143 | vid)) | |
4b426b10 | 1144 | return true; |
23721387 SW |
1145 | break; |
1146 | } | |
1147 | ||
39c75a51 | 1148 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1149 | "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 | 1150 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
4b426b10 | 1151 | return true; |
23721387 SW |
1152 | } |
1153 | ||
04e14be6 SW |
1154 | /** |
1155 | * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or | |
1156 | * immediately | |
1157 | * @bat_priv: the bat priv with all the soft interface information | |
1158 | * @now: whether the whole hash shall be wiped now | |
1159 | * | |
1160 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1161 | * a time out, or clean all backbone gws if now is set. |
1162 | */ | |
56303d34 | 1163 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1164 | { |
bae98774 | 1165 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1166 | struct hlist_node *node_tmp; |
23721387 | 1167 | struct hlist_head *head; |
5bf74e9c | 1168 | struct batadv_hashtable *hash; |
23721387 SW |
1169 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1170 | int i; | |
1171 | ||
807736f6 | 1172 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1173 | if (!hash) |
1174 | return; | |
1175 | ||
1176 | for (i = 0; i < hash->size; i++) { | |
1177 | head = &hash->table[i]; | |
1178 | list_lock = &hash->list_locks[i]; | |
1179 | ||
1180 | spin_lock_bh(list_lock); | |
b67bfe0d | 1181 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1182 | head, hash_entry) { |
1183 | if (now) | |
1184 | goto purge_now; | |
1eda58bf | 1185 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1186 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1187 | continue; |
1188 | ||
39c75a51 | 1189 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1190 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1191 | backbone_gw->orig); | |
23721387 SW |
1192 | |
1193 | purge_now: | |
1194 | /* don't wait for the pending request anymore */ | |
1195 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1196 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1197 | |
3b300de3 | 1198 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1199 | |
b67bfe0d | 1200 | hlist_del_rcu(&backbone_gw->hash_entry); |
c8b86c12 | 1201 | batadv_backbone_gw_put(backbone_gw); |
23721387 SW |
1202 | } |
1203 | spin_unlock_bh(list_lock); | |
1204 | } | |
1205 | } | |
1206 | ||
2c53040f | 1207 | /** |
04e14be6 | 1208 | * batadv_bla_purge_claims - Remove claims after a timeout or immediately |
2c53040f | 1209 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1210 | * @primary_if: the selected primary interface, may be NULL if now is set |
1211 | * @now: whether the whole hash shall be wiped now | |
1212 | * | |
1213 | * Check when we heard last time from our own claims, and remove them in case of | |
1214 | * a time out, or clean all claims if now is set | |
1215 | */ | |
56303d34 SE |
1216 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1217 | struct batadv_hard_iface *primary_if, | |
1218 | int now) | |
23721387 | 1219 | { |
712bbfe4 | 1220 | struct batadv_bla_claim *claim; |
23721387 | 1221 | struct hlist_head *head; |
5bf74e9c | 1222 | struct batadv_hashtable *hash; |
23721387 SW |
1223 | int i; |
1224 | ||
807736f6 | 1225 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1226 | if (!hash) |
1227 | return; | |
1228 | ||
1229 | for (i = 0; i < hash->size; i++) { | |
1230 | head = &hash->table[i]; | |
1231 | ||
1232 | rcu_read_lock(); | |
b67bfe0d | 1233 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1234 | if (now) |
1235 | goto purge_now; | |
1eda58bf SE |
1236 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1237 | primary_if->net_dev->dev_addr)) | |
23721387 | 1238 | continue; |
1eda58bf | 1239 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1240 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1241 | continue; |
1242 | ||
39c75a51 | 1243 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1244 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1245 | claim->addr, claim->vid); | |
23721387 SW |
1246 | |
1247 | purge_now: | |
3b300de3 SE |
1248 | batadv_handle_unclaim(bat_priv, primary_if, |
1249 | claim->backbone_gw->orig, | |
1250 | claim->addr, claim->vid); | |
23721387 SW |
1251 | } |
1252 | rcu_read_unlock(); | |
1253 | } | |
1254 | } | |
1255 | ||
2c53040f | 1256 | /** |
04e14be6 SW |
1257 | * batadv_bla_update_orig_address - Update the backbone gateways when the own |
1258 | * originator address changes | |
2c53040f | 1259 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1260 | * @primary_if: the new selected primary_if |
1261 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1262 | */ |
56303d34 SE |
1263 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1264 | struct batadv_hard_iface *primary_if, | |
1265 | struct batadv_hard_iface *oldif) | |
23721387 | 1266 | { |
bae98774 | 1267 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1268 | struct hlist_head *head; |
5bf74e9c | 1269 | struct batadv_hashtable *hash; |
807736f6 | 1270 | __be16 group; |
23721387 SW |
1271 | int i; |
1272 | ||
38ef3d1d | 1273 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1274 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1275 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1276 | |
d5b4c93e SW |
1277 | /* purge everything when bridge loop avoidance is turned off */ |
1278 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1279 | oldif = NULL; | |
1280 | ||
23721387 | 1281 | if (!oldif) { |
3b300de3 SE |
1282 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1283 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1284 | return; |
1285 | } | |
1286 | ||
807736f6 | 1287 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1288 | if (!hash) |
1289 | return; | |
1290 | ||
1291 | for (i = 0; i < hash->size; i++) { | |
1292 | head = &hash->table[i]; | |
1293 | ||
1294 | rcu_read_lock(); | |
b67bfe0d | 1295 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1296 | /* own orig still holds the old value. */ |
1eda58bf SE |
1297 | if (!batadv_compare_eth(backbone_gw->orig, |
1298 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1299 | continue; |
1300 | ||
8fdd0153 AQ |
1301 | ether_addr_copy(backbone_gw->orig, |
1302 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1303 | /* send an announce frame so others will ask for our |
1304 | * claims and update their tables. | |
1305 | */ | |
3b300de3 | 1306 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1307 | } |
1308 | rcu_read_unlock(); | |
1309 | } | |
1310 | } | |
1311 | ||
cd9c7bfb SW |
1312 | /** |
1313 | * batadv_bla_send_loopdetect - send a loopdetect frame | |
1314 | * @bat_priv: the bat priv with all the soft interface information | |
1315 | * @backbone_gw: the backbone gateway for which a loop should be detected | |
1316 | * | |
1317 | * To detect loops that the bridge loop avoidance can't handle, send a loop | |
1318 | * detection packet on the backbone. Unlike other BLA frames, this frame will | |
1319 | * be allowed on the mesh by other nodes. If it is received on the mesh, this | |
1320 | * indicates that there is a loop. | |
1321 | */ | |
1322 | static void | |
1323 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, | |
1324 | struct batadv_bla_backbone_gw *backbone_gw) | |
1325 | { | |
1326 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", | |
1327 | backbone_gw->vid); | |
1328 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, | |
1329 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); | |
1330 | } | |
1331 | ||
d68081a2 SW |
1332 | /** |
1333 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1334 | * @net_dev: the soft interface net device | |
1335 | */ | |
1336 | void batadv_bla_status_update(struct net_device *net_dev) | |
1337 | { | |
1338 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1339 | struct batadv_hard_iface *primary_if; | |
1340 | ||
1341 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1342 | if (!primary_if) | |
1343 | return; | |
1344 | ||
1345 | /* this function already purges everything when bla is disabled, | |
1346 | * so just call that one. | |
1347 | */ | |
1348 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
82047ad7 | 1349 | batadv_hardif_put(primary_if); |
d68081a2 SW |
1350 | } |
1351 | ||
04e14be6 SW |
1352 | /** |
1353 | * batadv_bla_periodic_work - performs periodic bla work | |
1354 | * @work: kernel work struct | |
1355 | * | |
1356 | * periodic work to do: | |
23721387 SW |
1357 | * * purge structures when they are too old |
1358 | * * send announcements | |
1359 | */ | |
3b300de3 | 1360 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1361 | { |
bbb1f90e | 1362 | struct delayed_work *delayed_work; |
56303d34 | 1363 | struct batadv_priv *bat_priv; |
807736f6 | 1364 | struct batadv_priv_bla *priv_bla; |
23721387 | 1365 | struct hlist_head *head; |
bae98774 | 1366 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1367 | struct batadv_hashtable *hash; |
56303d34 | 1368 | struct batadv_hard_iface *primary_if; |
cd9c7bfb | 1369 | bool send_loopdetect = false; |
23721387 SW |
1370 | int i; |
1371 | ||
4ba4bc0f | 1372 | delayed_work = to_delayed_work(work); |
807736f6 SE |
1373 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1374 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1375 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1376 | if (!primary_if) |
1377 | goto out; | |
1378 | ||
3b300de3 SE |
1379 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1380 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1381 | |
1382 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1383 | goto out; | |
1384 | ||
cd9c7bfb SW |
1385 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
1386 | /* set a new random mac address for the next bridge loop | |
1387 | * detection frames. Set the locally administered bit to avoid | |
1388 | * collisions with users mac addresses. | |
1389 | */ | |
1390 | random_ether_addr(bat_priv->bla.loopdetect_addr); | |
1391 | bat_priv->bla.loopdetect_addr[0] = 0xba; | |
1392 | bat_priv->bla.loopdetect_addr[1] = 0xbe; | |
1393 | bat_priv->bla.loopdetect_lasttime = jiffies; | |
1394 | atomic_set(&bat_priv->bla.loopdetect_next, | |
1395 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1396 | ||
1397 | /* mark for sending loop detect on all VLANs */ | |
1398 | send_loopdetect = true; | |
1399 | } | |
1400 | ||
807736f6 | 1401 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1402 | if (!hash) |
1403 | goto out; | |
1404 | ||
1405 | for (i = 0; i < hash->size; i++) { | |
1406 | head = &hash->table[i]; | |
1407 | ||
1408 | rcu_read_lock(); | |
b67bfe0d | 1409 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1410 | if (!batadv_compare_eth(backbone_gw->orig, |
1411 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1412 | continue; |
1413 | ||
1414 | backbone_gw->lasttime = jiffies; | |
1415 | ||
3b300de3 | 1416 | batadv_bla_send_announce(bat_priv, backbone_gw); |
cd9c7bfb SW |
1417 | if (send_loopdetect) |
1418 | batadv_bla_send_loopdetect(bat_priv, | |
1419 | backbone_gw); | |
d807f272 SW |
1420 | |
1421 | /* request_sent is only set after creation to avoid | |
1422 | * problems when we are not yet known as backbone gw | |
1423 | * in the backbone. | |
1424 | * | |
28709878 SW |
1425 | * We can reset this now after we waited some periods |
1426 | * to give bridge forward delays and bla group forming | |
1427 | * some grace time. | |
d807f272 SW |
1428 | */ |
1429 | ||
1430 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1431 | continue; | |
1432 | ||
28709878 SW |
1433 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1434 | continue; | |
1435 | ||
d807f272 SW |
1436 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1437 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1438 | } |
1439 | rcu_read_unlock(); | |
1440 | } | |
1441 | out: | |
1442 | if (primary_if) | |
82047ad7 | 1443 | batadv_hardif_put(primary_if); |
23721387 | 1444 | |
72414442 AQ |
1445 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1446 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1447 | } |
1448 | ||
5d52dad2 SE |
1449 | /* The hash for claim and backbone hash receive the same key because they |
1450 | * are getting initialized by hash_new with the same key. Reinitializing | |
1451 | * them with to different keys to allow nested locking without generating | |
1452 | * lockdep warnings | |
1453 | */ | |
3b300de3 SE |
1454 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1455 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1456 | |
04e14be6 SW |
1457 | /** |
1458 | * batadv_bla_init - initialize all bla structures | |
1459 | * @bat_priv: the bat priv with all the soft interface information | |
1460 | * | |
1461 | * Return: 0 on success, < 0 on error. | |
1462 | */ | |
56303d34 | 1463 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1464 | { |
fe2da6ff | 1465 | int i; |
6b5e971a | 1466 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1467 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1468 | u16 crc; |
807736f6 | 1469 | unsigned long entrytime; |
fe2da6ff | 1470 | |
7dac7b76 LL |
1471 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1472 | ||
39c75a51 | 1473 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1474 | |
38ef3d1d | 1475 | /* setting claim destination address */ |
807736f6 SE |
1476 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1477 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1478 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1479 | if (primary_if) { |
807736f6 SE |
1480 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1481 | bat_priv->bla.claim_dest.group = htons(crc); | |
82047ad7 | 1482 | batadv_hardif_put(primary_if); |
38ef3d1d | 1483 | } else { |
807736f6 | 1484 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1485 | } |
1486 | ||
fe2da6ff | 1487 | /* initialize the duplicate list */ |
807736f6 | 1488 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1489 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1490 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1491 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1492 | |
cd9c7bfb SW |
1493 | atomic_set(&bat_priv->bla.loopdetect_next, |
1494 | BATADV_BLA_LOOPDETECT_PERIODS); | |
1495 | ||
807736f6 | 1496 | if (bat_priv->bla.claim_hash) |
5346c35e | 1497 | return 0; |
23721387 | 1498 | |
807736f6 SE |
1499 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1500 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1501 | |
807736f6 | 1502 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1503 | return -ENOMEM; |
23721387 | 1504 | |
807736f6 | 1505 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1506 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1507 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1508 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1509 | |
39c75a51 | 1510 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1511 | |
72414442 AQ |
1512 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1513 | ||
1514 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1515 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1516 | return 0; |
23721387 SW |
1517 | } |
1518 | ||
2c53040f | 1519 | /** |
04e14be6 | 1520 | * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. |
2c53040f | 1521 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1522 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1523 | * |
1524 | * check if it is on our broadcast list. Another gateway might | |
1525 | * have sent the same packet because it is connected to the same backbone, | |
1526 | * so we have to remove this duplicate. | |
1527 | * | |
1528 | * This is performed by checking the CRC, which will tell us | |
1529 | * with a good chance that it is the same packet. If it is furthermore | |
1530 | * sent by another host, drop it. We allow equal packets from | |
1531 | * the same host however as this might be intended. | |
04e14be6 | 1532 | * |
4b426b10 | 1533 | * Return: true if a packet is in the duplicate list, false otherwise. |
9cfc7bd6 | 1534 | */ |
4b426b10 SE |
1535 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
1536 | struct sk_buff *skb) | |
fe2da6ff | 1537 | { |
4b426b10 | 1538 | int i, curr; |
004e86fc SW |
1539 | __be32 crc; |
1540 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1541 | struct batadv_bcast_duplist_entry *entry; |
4b426b10 | 1542 | bool ret = false; |
fe2da6ff | 1543 | |
004e86fc | 1544 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1545 | |
1546 | /* calculate the crc ... */ | |
004e86fc | 1547 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1548 | |
7dac7b76 LL |
1549 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1550 | ||
42d0b044 | 1551 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1552 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1553 | curr %= BATADV_DUPLIST_SIZE; | |
1554 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1555 | |
1556 | /* we can stop searching if the entry is too old ; | |
1557 | * later entries will be even older | |
1558 | */ | |
42d0b044 SE |
1559 | if (batadv_has_timed_out(entry->entrytime, |
1560 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1561 | break; |
1562 | ||
1563 | if (entry->crc != crc) | |
1564 | continue; | |
1565 | ||
1eda58bf | 1566 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1567 | continue; |
1568 | ||
1569 | /* this entry seems to match: same crc, not too old, | |
4b426b10 | 1570 | * and from another gw. therefore return true to forbid it. |
fe2da6ff | 1571 | */ |
4b426b10 | 1572 | ret = true; |
7dac7b76 | 1573 | goto out; |
fe2da6ff | 1574 | } |
7dac7b76 | 1575 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1576 | * and allow it, its the first occurrence. |
7dac7b76 | 1577 | */ |
807736f6 | 1578 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1579 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1580 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1581 | entry->crc = crc; |
1582 | entry->entrytime = jiffies; | |
8fdd0153 | 1583 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1584 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1585 | |
7dac7b76 LL |
1586 | out: |
1587 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1588 | ||
1589 | return ret; | |
fe2da6ff SW |
1590 | } |
1591 | ||
1b371d13 | 1592 | /** |
04e14be6 SW |
1593 | * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for |
1594 | * the VLAN identified by vid. | |
1b371d13 | 1595 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1596 | * @orig: originator mac address |
cfd4f757 | 1597 | * @vid: VLAN identifier |
20ff9d59 | 1598 | * |
62fe710f | 1599 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1600 | */ |
6b5e971a | 1601 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1602 | unsigned short vid) |
20ff9d59 | 1603 | { |
807736f6 | 1604 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1605 | struct hlist_head *head; |
bae98774 | 1606 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1607 | int i; |
1608 | ||
1609 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1610 | return false; |
20ff9d59 SW |
1611 | |
1612 | if (!hash) | |
cfd4f757 | 1613 | return false; |
20ff9d59 SW |
1614 | |
1615 | for (i = 0; i < hash->size; i++) { | |
1616 | head = &hash->table[i]; | |
1617 | ||
1618 | rcu_read_lock(); | |
b67bfe0d | 1619 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1620 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1621 | backbone_gw->vid == vid) { | |
20ff9d59 | 1622 | rcu_read_unlock(); |
cfd4f757 | 1623 | return true; |
20ff9d59 SW |
1624 | } |
1625 | } | |
1626 | rcu_read_unlock(); | |
1627 | } | |
1628 | ||
cfd4f757 | 1629 | return false; |
20ff9d59 SW |
1630 | } |
1631 | ||
2c53040f | 1632 | /** |
04e14be6 | 1633 | * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. |
2c53040f | 1634 | * @skb: the frame to be checked |
23721387 SW |
1635 | * @orig_node: the orig_node of the frame |
1636 | * @hdr_size: maximum length of the frame | |
1637 | * | |
4b426b10 SE |
1638 | * Return: true if the orig_node is also a gateway on the soft interface, |
1639 | * otherwise it returns false. | |
23721387 | 1640 | */ |
4b426b10 SE |
1641 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1642 | struct batadv_orig_node *orig_node, int hdr_size) | |
23721387 | 1643 | { |
bae98774 | 1644 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1645 | unsigned short vid; |
23721387 SW |
1646 | |
1647 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
4b426b10 | 1648 | return false; |
23721387 SW |
1649 | |
1650 | /* first, find out the vid. */ | |
0d125074 | 1651 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
4b426b10 | 1652 | return false; |
23721387 | 1653 | |
c018ad3d | 1654 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1655 | |
1656 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1657 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1658 | orig_node->orig, vid); | |
23721387 | 1659 | if (!backbone_gw) |
4b426b10 | 1660 | return false; |
23721387 | 1661 | |
c8b86c12 | 1662 | batadv_backbone_gw_put(backbone_gw); |
4b426b10 | 1663 | return true; |
23721387 SW |
1664 | } |
1665 | ||
04e14be6 | 1666 | /** |
6d030de8 | 1667 | * batadv_bla_free - free all bla structures |
04e14be6 SW |
1668 | * @bat_priv: the bat priv with all the soft interface information |
1669 | * | |
1670 | * for softinterface free or module unload | |
1671 | */ | |
56303d34 | 1672 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1673 | { |
56303d34 | 1674 | struct batadv_hard_iface *primary_if; |
23721387 | 1675 | |
807736f6 | 1676 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1677 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1678 | |
807736f6 | 1679 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1680 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1681 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1682 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1683 | } |
807736f6 | 1684 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1685 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1686 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1687 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1688 | } |
1689 | if (primary_if) | |
82047ad7 | 1690 | batadv_hardif_put(primary_if); |
23721387 SW |
1691 | } |
1692 | ||
cd9c7bfb SW |
1693 | /** |
1694 | * batadv_bla_loopdetect_check - check and handle a detected loop | |
1695 | * @bat_priv: the bat priv with all the soft interface information | |
1696 | * @skb: the packet to check | |
1697 | * @primary_if: interface where the request came on | |
1698 | * @vid: the VLAN ID of the frame | |
1699 | * | |
1700 | * Checks if this packet is a loop detect frame which has been sent by us, | |
1701 | * throw an uevent and log the event if that is the case. | |
1702 | * | |
1703 | * Return: true if it is a loop detect frame which is to be dropped, false | |
1704 | * otherwise. | |
1705 | */ | |
1706 | static bool | |
1707 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, | |
1708 | struct batadv_hard_iface *primary_if, | |
1709 | unsigned short vid) | |
1710 | { | |
1711 | struct batadv_bla_backbone_gw *backbone_gw; | |
1712 | struct ethhdr *ethhdr; | |
1713 | ||
1714 | ethhdr = eth_hdr(skb); | |
1715 | ||
1716 | /* Only check for the MAC address and skip more checks here for | |
1717 | * performance reasons - this function is on the hotpath, after all. | |
1718 | */ | |
1719 | if (!batadv_compare_eth(ethhdr->h_source, | |
1720 | bat_priv->bla.loopdetect_addr)) | |
1721 | return false; | |
1722 | ||
1723 | /* If the packet came too late, don't forward it on the mesh | |
1724 | * but don't consider that as loop. It might be a coincidence. | |
1725 | */ | |
1726 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, | |
1727 | BATADV_BLA_LOOPDETECT_TIMEOUT)) | |
1728 | return true; | |
1729 | ||
1730 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, | |
1731 | primary_if->net_dev->dev_addr, | |
1732 | vid, true); | |
1733 | if (unlikely(!backbone_gw)) | |
1734 | return true; | |
1735 | ||
1736 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); | |
1737 | /* backbone_gw is unreferenced in the report work function function */ | |
1738 | ||
1739 | return true; | |
1740 | } | |
1741 | ||
2c53040f | 1742 | /** |
04e14be6 | 1743 | * batadv_bla_rx - check packets coming from the mesh. |
2c53040f | 1744 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1745 | * @skb: the frame to be checked |
1746 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1747 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1748 | * |
04e14be6 | 1749 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1750 | * * we have to race for a claim |
1751 | * * if the frame is allowed on the LAN | |
1752 | * | |
62fe710f SE |
1753 | * in these cases, the skb is further handled by this function |
1754 | * | |
4b426b10 SE |
1755 | * Return: true if handled, otherwise it returns false and the caller shall |
1756 | * further process the skb. | |
23721387 | 1757 | */ |
4b426b10 SE |
1758 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1759 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1760 | { |
1761 | struct ethhdr *ethhdr; | |
712bbfe4 | 1762 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1763 | struct batadv_hard_iface *primary_if; |
4b426b10 | 1764 | bool ret; |
23721387 | 1765 | |
7ed4be95 | 1766 | ethhdr = eth_hdr(skb); |
23721387 | 1767 | |
e5d89254 | 1768 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1769 | if (!primary_if) |
1770 | goto handled; | |
1771 | ||
1772 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1773 | goto allow; | |
1774 | ||
cd9c7bfb SW |
1775 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
1776 | goto handled; | |
1777 | ||
807736f6 | 1778 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1779 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1780 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1781 | goto handled; |
1782 | ||
8fdd0153 | 1783 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1784 | search_claim.vid = vid; |
3b300de3 | 1785 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1786 | |
1787 | if (!claim) { | |
1788 | /* possible optimization: race for a claim */ | |
1789 | /* No claim exists yet, claim it for us! | |
1790 | */ | |
3b300de3 SE |
1791 | batadv_handle_claim(bat_priv, primary_if, |
1792 | primary_if->net_dev->dev_addr, | |
1793 | ethhdr->h_source, vid); | |
23721387 SW |
1794 | goto allow; |
1795 | } | |
1796 | ||
1797 | /* if it is our own claim ... */ | |
1eda58bf SE |
1798 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1799 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1800 | /* ... allow it in any case */ |
1801 | claim->lasttime = jiffies; | |
1802 | goto allow; | |
1803 | } | |
1804 | ||
1805 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1806 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1807 | /* ... drop it. the responsible gateway is in charge. | |
1808 | * | |
1809 | * We need to check is_bcast because with the gateway | |
1810 | * feature, broadcasts (like DHCP requests) may be sent | |
1811 | * using a unicast packet type. | |
1812 | */ | |
23721387 SW |
1813 | goto handled; |
1814 | } else { | |
1815 | /* seems the client considers us as its best gateway. | |
1816 | * send a claim and update the claim table | |
1817 | * immediately. | |
1818 | */ | |
3b300de3 SE |
1819 | batadv_handle_claim(bat_priv, primary_if, |
1820 | primary_if->net_dev->dev_addr, | |
1821 | ethhdr->h_source, vid); | |
23721387 SW |
1822 | goto allow; |
1823 | } | |
1824 | allow: | |
3b300de3 | 1825 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1826 | ret = false; |
23721387 SW |
1827 | goto out; |
1828 | ||
1829 | handled: | |
1830 | kfree_skb(skb); | |
4b426b10 | 1831 | ret = true; |
23721387 SW |
1832 | |
1833 | out: | |
1834 | if (primary_if) | |
82047ad7 | 1835 | batadv_hardif_put(primary_if); |
23721387 | 1836 | if (claim) |
321e3e08 | 1837 | batadv_claim_put(claim); |
23721387 SW |
1838 | return ret; |
1839 | } | |
1840 | ||
2c53040f | 1841 | /** |
04e14be6 | 1842 | * batadv_bla_tx - check packets going into the mesh |
2c53040f | 1843 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1844 | * @skb: the frame to be checked |
1845 | * @vid: the VLAN ID of the frame | |
1846 | * | |
04e14be6 | 1847 | * batadv_bla_tx checks if: |
23721387 SW |
1848 | * * a claim was received which has to be processed |
1849 | * * the frame is allowed on the mesh | |
1850 | * | |
62fe710f | 1851 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1852 | * |
1853 | * This call might reallocate skb data. | |
62fe710f | 1854 | * |
4b426b10 SE |
1855 | * Return: true if handled, otherwise it returns false and the caller shall |
1856 | * further process the skb. | |
23721387 | 1857 | */ |
4b426b10 SE |
1858 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1859 | unsigned short vid) | |
23721387 SW |
1860 | { |
1861 | struct ethhdr *ethhdr; | |
712bbfe4 | 1862 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1863 | struct batadv_hard_iface *primary_if; |
4b426b10 | 1864 | bool ret = false; |
23721387 | 1865 | |
e5d89254 | 1866 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1867 | if (!primary_if) |
1868 | goto out; | |
1869 | ||
1870 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1871 | goto allow; | |
1872 | ||
3b300de3 | 1873 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1874 | goto handled; |
1875 | ||
7ed4be95 | 1876 | ethhdr = eth_hdr(skb); |
23721387 | 1877 | |
807736f6 | 1878 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1879 | /* don't allow broadcasts while requests are in flight */ |
1880 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1881 | goto handled; | |
1882 | ||
8fdd0153 | 1883 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1884 | search_claim.vid = vid; |
1885 | ||
3b300de3 | 1886 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1887 | |
1888 | /* if no claim exists, allow it. */ | |
1889 | if (!claim) | |
1890 | goto allow; | |
1891 | ||
1892 | /* check if we are responsible. */ | |
1eda58bf SE |
1893 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1894 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1895 | /* if yes, the client has roamed and we have |
1896 | * to unclaim it. | |
1897 | */ | |
3b300de3 SE |
1898 | batadv_handle_unclaim(bat_priv, primary_if, |
1899 | primary_if->net_dev->dev_addr, | |
1900 | ethhdr->h_source, vid); | |
23721387 SW |
1901 | goto allow; |
1902 | } | |
1903 | ||
1904 | /* check if it is a multicast/broadcast frame */ | |
1905 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1906 | /* drop it. the responsible gateway has forwarded it into | |
1907 | * the backbone network. | |
1908 | */ | |
1909 | goto handled; | |
1910 | } else { | |
1911 | /* we must allow it. at least if we are | |
1912 | * responsible for the DESTINATION. | |
1913 | */ | |
1914 | goto allow; | |
1915 | } | |
1916 | allow: | |
3b300de3 | 1917 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
4b426b10 | 1918 | ret = false; |
23721387 SW |
1919 | goto out; |
1920 | handled: | |
4b426b10 | 1921 | ret = true; |
23721387 SW |
1922 | out: |
1923 | if (primary_if) | |
82047ad7 | 1924 | batadv_hardif_put(primary_if); |
23721387 | 1925 | if (claim) |
321e3e08 | 1926 | batadv_claim_put(claim); |
23721387 SW |
1927 | return ret; |
1928 | } | |
9bf8e4d4 | 1929 | |
04e14be6 SW |
1930 | /** |
1931 | * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file | |
1932 | * @seq: seq file to print on | |
1933 | * @offset: not used | |
1934 | * | |
1935 | * Return: always 0 | |
1936 | */ | |
08adf151 | 1937 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1938 | { |
1939 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1940 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1941 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1942 | struct batadv_bla_claim *claim; |
56303d34 | 1943 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 1944 | struct hlist_head *head; |
5a1dd8a4 | 1945 | u16 backbone_crc; |
6b5e971a | 1946 | u32 i; |
9bf8e4d4 | 1947 | bool is_own; |
6b5e971a | 1948 | u8 *primary_addr; |
9bf8e4d4 | 1949 | |
30da63a6 ML |
1950 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1951 | if (!primary_if) | |
9bf8e4d4 | 1952 | goto out; |
9bf8e4d4 | 1953 | |
1eda58bf | 1954 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1955 | seq_printf(seq, |
39a32991 | 1956 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1957 | net_dev->name, primary_addr, |
807736f6 | 1958 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 AQ |
1959 | seq_puts(seq, |
1960 | " Client VID Originator [o] (CRC )\n"); | |
9bf8e4d4 SW |
1961 | for (i = 0; i < hash->size; i++) { |
1962 | head = &hash->table[i]; | |
1963 | ||
1964 | rcu_read_lock(); | |
b67bfe0d | 1965 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1966 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1967 | primary_addr); | |
5a1dd8a4 SW |
1968 | |
1969 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
1970 | backbone_crc = claim->backbone_gw->crc; | |
1971 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
eb2deb6b | 1972 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1973 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1974 | claim->backbone_gw->orig, |
1975 | (is_own ? 'x' : ' '), | |
5a1dd8a4 | 1976 | backbone_crc); |
9bf8e4d4 SW |
1977 | } |
1978 | rcu_read_unlock(); | |
1979 | } | |
1980 | out: | |
1981 | if (primary_if) | |
82047ad7 | 1982 | batadv_hardif_put(primary_if); |
30da63a6 | 1983 | return 0; |
9bf8e4d4 | 1984 | } |
536a23f1 | 1985 | |
04e14be6 SW |
1986 | /** |
1987 | * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq | |
1988 | * file | |
1989 | * @seq: seq file to print on | |
1990 | * @offset: not used | |
1991 | * | |
1992 | * Return: always 0 | |
1993 | */ | |
536a23f1 SW |
1994 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
1995 | { | |
1996 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1997 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1998 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1999 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 2000 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
2001 | struct hlist_head *head; |
2002 | int secs, msecs; | |
5a1dd8a4 | 2003 | u16 backbone_crc; |
6b5e971a | 2004 | u32 i; |
536a23f1 | 2005 | bool is_own; |
6b5e971a | 2006 | u8 *primary_addr; |
536a23f1 | 2007 | |
30da63a6 ML |
2008 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
2009 | if (!primary_if) | |
536a23f1 | 2010 | goto out; |
536a23f1 SW |
2011 | |
2012 | primary_addr = primary_if->net_dev->dev_addr; | |
2013 | seq_printf(seq, | |
39a32991 | 2014 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 2015 | net_dev->name, primary_addr, |
807736f6 | 2016 | ntohs(bat_priv->bla.claim_dest.group)); |
925a6f37 | 2017 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
536a23f1 SW |
2018 | for (i = 0; i < hash->size; i++) { |
2019 | head = &hash->table[i]; | |
2020 | ||
2021 | rcu_read_lock(); | |
b67bfe0d | 2022 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
2023 | msecs = jiffies_to_msecs(jiffies - |
2024 | backbone_gw->lasttime); | |
2025 | secs = msecs / 1000; | |
2026 | msecs = msecs % 1000; | |
2027 | ||
2028 | is_own = batadv_compare_eth(backbone_gw->orig, | |
2029 | primary_addr); | |
2030 | if (is_own) | |
2031 | continue; | |
2032 | ||
5a1dd8a4 SW |
2033 | spin_lock_bh(&backbone_gw->crc_lock); |
2034 | backbone_crc = backbone_gw->crc; | |
2035 | spin_unlock_bh(&backbone_gw->crc_lock); | |
2036 | ||
eb2deb6b | 2037 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
2038 | backbone_gw->orig, |
2039 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 2040 | msecs, backbone_crc); |
536a23f1 SW |
2041 | } |
2042 | rcu_read_unlock(); | |
2043 | } | |
2044 | out: | |
2045 | if (primary_if) | |
82047ad7 | 2046 | batadv_hardif_put(primary_if); |
30da63a6 | 2047 | return 0; |
536a23f1 | 2048 | } |