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