Merge tag 'intel_th-stm-for-greg-20190221' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-block.git] / net / batman-adv / bridge_loop_avoidance.c
CommitLineData
7db7d9f3 1// SPDX-License-Identifier: GPL-2.0
6b1aea8c 2/* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors:
23721387
SW
3 *
4 * Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
ebf38fb7 16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
23721387
SW
17 */
18
23721387 19#include "bridge_loop_avoidance.h"
1e2c2a4f 20#include "main.h"
23721387 21
1e2c2a4f
SE
22#include <linux/atomic.h>
23#include <linux/byteorder/generic.h>
24#include <linux/compiler.h>
23721387 25#include <linux/crc16.h>
1e2c2a4f
SE
26#include <linux/errno.h>
27#include <linux/etherdevice.h>
b92b94ac 28#include <linux/gfp.h>
23721387 29#include <linux/if_arp.h>
1e2c2a4f 30#include <linux/if_ether.h>
23721387 31#include <linux/if_vlan.h>
1e2c2a4f
SE
32#include <linux/jhash.h>
33#include <linux/jiffies.h>
34#include <linux/kernel.h>
06e56ded 35#include <linux/kref.h>
1e2c2a4f
SE
36#include <linux/list.h>
37#include <linux/lockdep.h>
38#include <linux/netdevice.h>
04f3f5bf 39#include <linux/netlink.h>
1e2c2a4f
SE
40#include <linux/rculist.h>
41#include <linux/rcupdate.h>
42#include <linux/seq_file.h>
43#include <linux/skbuff.h>
44#include <linux/slab.h>
45#include <linux/spinlock.h>
46#include <linux/stddef.h>
47#include <linux/string.h>
48#include <linux/workqueue.h>
49#include <net/arp.h>
04f3f5bf
AL
50#include <net/genetlink.h>
51#include <net/netlink.h>
52#include <net/sock.h>
fec149f5 53#include <uapi/linux/batadv_packet.h>
04f3f5bf 54#include <uapi/linux/batman_adv.h>
1e2c2a4f
SE
55
56#include "hard-interface.h"
57#include "hash.h"
ba412080 58#include "log.h"
04f3f5bf 59#include "netlink.h"
1e2c2a4f 60#include "originator.h"
04f3f5bf 61#include "soft-interface.h"
cd9c7bfb 62#include "sysfs.h"
1e2c2a4f 63#include "translation-table.h"
23721387 64
6b5e971a 65static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
23721387 66
3b300de3 67static void batadv_bla_periodic_work(struct work_struct *work);
bae98774
ML
68static void
69batadv_bla_send_announce(struct batadv_priv *bat_priv,
70 struct batadv_bla_backbone_gw *backbone_gw);
23721387 71
62fe710f 72/**
7e9a8c2c 73 * batadv_choose_claim() - choose the right bucket for a claim.
04e14be6
SW
74 * @data: data to hash
75 * @size: size of the hash table
62fe710f 76 *
04e14be6 77 * Return: the hash index of the claim
62fe710f 78 */
6b5e971a 79static inline u32 batadv_choose_claim(const void *data, u32 size)
23721387 80{
712bbfe4 81 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
6b5e971a 82 u32 hash = 0;
23721387 83
36fd61cb
SE
84 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
85 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
23721387
SW
86
87 return hash % size;
88}
89
62fe710f 90/**
7e9a8c2c 91 * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway.
04e14be6
SW
92 * @data: data to hash
93 * @size: size of the hash table
62fe710f 94 *
04e14be6 95 * Return: the hash index of the backbone gateway
62fe710f 96 */
6b5e971a 97static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
23721387 98{
712bbfe4 99 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
6b5e971a 100 u32 hash = 0;
23721387 101
36fd61cb
SE
102 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
103 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
23721387
SW
104
105 return hash % size;
106}
107
04e14be6 108/**
7e9a8c2c 109 * batadv_compare_backbone_gw() - compare address and vid of two backbone gws
04e14be6
SW
110 * @node: list node of the first entry to compare
111 * @data2: pointer to the second backbone gateway
112 *
4b426b10 113 * Return: true if the backbones have the same data, false otherwise
04e14be6 114 */
4b426b10
SE
115static bool batadv_compare_backbone_gw(const struct hlist_node *node,
116 const void *data2)
23721387 117{
bae98774 118 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
23721387 119 hash_entry);
4f248cff
SE
120 const struct batadv_bla_backbone_gw *gw1 = data1;
121 const struct batadv_bla_backbone_gw *gw2 = data2;
23721387 122
c76d1525 123 if (!batadv_compare_eth(gw1->orig, gw2->orig))
4b426b10 124 return false;
c76d1525
SW
125
126 if (gw1->vid != gw2->vid)
4b426b10 127 return false;
c76d1525 128
4b426b10 129 return true;
23721387
SW
130}
131
04e14be6 132/**
7e9a8c2c 133 * batadv_compare_claim() - compare address and vid of two claims
04e14be6
SW
134 * @node: list node of the first entry to compare
135 * @data2: pointer to the second claims
136 *
4b426b10 137 * Return: true if the claim have the same data, 0 otherwise
04e14be6 138 */
4b426b10
SE
139static bool batadv_compare_claim(const struct hlist_node *node,
140 const void *data2)
23721387 141{
712bbfe4 142 const void *data1 = container_of(node, struct batadv_bla_claim,
23721387 143 hash_entry);
4f248cff
SE
144 const struct batadv_bla_claim *cl1 = data1;
145 const struct batadv_bla_claim *cl2 = data2;
c76d1525
SW
146
147 if (!batadv_compare_eth(cl1->addr, cl2->addr))
4b426b10 148 return false;
c76d1525
SW
149
150 if (cl1->vid != cl2->vid)
4b426b10 151 return false;
23721387 152
4b426b10 153 return true;
23721387
SW
154}
155
04e14be6 156/**
7e9a8c2c 157 * batadv_backbone_gw_release() - release backbone gw from lists and queue for
06e56ded
SE
158 * free after rcu grace period
159 * @ref: kref pointer of the backbone gw
160 */
161static void batadv_backbone_gw_release(struct kref *ref)
162{
163 struct batadv_bla_backbone_gw *backbone_gw;
164
165 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
166 refcount);
167
168 kfree_rcu(backbone_gw, rcu);
169}
170
171/**
7e9a8c2c 172 * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly
c8b86c12 173 * release it
04e14be6
SW
174 * @backbone_gw: backbone gateway to be free'd
175 */
c8b86c12 176static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
23721387 177{
06e56ded 178 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
23721387
SW
179}
180
04e14be6 181/**
7e9a8c2c
SE
182 * batadv_claim_release() - release claim from lists and queue for free after
183 * rcu grace period
04e14be6
SW
184 * @ref: kref pointer of the claim
185 */
71b7e3d3 186static void batadv_claim_release(struct kref *ref)
23721387 187{
71b7e3d3 188 struct batadv_bla_claim *claim;
3db0decf 189 struct batadv_bla_backbone_gw *old_backbone_gw;
71b7e3d3
SE
190
191 claim = container_of(ref, struct batadv_bla_claim, refcount);
192
3db0decf
SE
193 spin_lock_bh(&claim->backbone_lock);
194 old_backbone_gw = claim->backbone_gw;
195 claim->backbone_gw = NULL;
196 spin_unlock_bh(&claim->backbone_lock);
197
198 spin_lock_bh(&old_backbone_gw->crc_lock);
199 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
200 spin_unlock_bh(&old_backbone_gw->crc_lock);
201
202 batadv_backbone_gw_put(old_backbone_gw);
203
63b39927 204 kfree_rcu(claim, rcu);
23721387
SW
205}
206
04e14be6 207/**
7e9a8c2c 208 * batadv_claim_put() - decrement the claim refcounter and possibly release it
04e14be6
SW
209 * @claim: claim to be free'd
210 */
321e3e08 211static void batadv_claim_put(struct batadv_bla_claim *claim)
23721387 212{
71b7e3d3 213 kref_put(&claim->refcount, batadv_claim_release);
23721387
SW
214}
215
1b371d13 216/**
7e9a8c2c 217 * batadv_claim_hash_find() - looks for a claim in the claim hash
1b371d13 218 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
219 * @data: search data (may be local/static data)
220 *
62fe710f 221 * Return: claim if found or NULL otherwise.
23721387 222 */
6fc77a54
SE
223static struct batadv_bla_claim *
224batadv_claim_hash_find(struct batadv_priv *bat_priv,
225 struct batadv_bla_claim *data)
23721387 226{
807736f6 227 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
23721387 228 struct hlist_head *head;
712bbfe4
ML
229 struct batadv_bla_claim *claim;
230 struct batadv_bla_claim *claim_tmp = NULL;
23721387
SW
231 int index;
232
233 if (!hash)
234 return NULL;
235
3b300de3 236 index = batadv_choose_claim(data, hash->size);
23721387
SW
237 head = &hash->table[index];
238
239 rcu_read_lock();
b67bfe0d 240 hlist_for_each_entry_rcu(claim, head, hash_entry) {
3b300de3 241 if (!batadv_compare_claim(&claim->hash_entry, data))
23721387
SW
242 continue;
243
71b7e3d3 244 if (!kref_get_unless_zero(&claim->refcount))
23721387
SW
245 continue;
246
247 claim_tmp = claim;
248 break;
249 }
250 rcu_read_unlock();
251
252 return claim_tmp;
253}
254
2c53040f 255/**
7e9a8c2c 256 * batadv_backbone_hash_find() - looks for a backbone gateway in the hash
2c53040f 257 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
258 * @addr: the address of the originator
259 * @vid: the VLAN ID
260 *
04e14be6 261 * Return: backbone gateway if found or NULL otherwise
23721387 262 */
bae98774 263static struct batadv_bla_backbone_gw *
6b5e971a
SE
264batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
265 unsigned short vid)
23721387 266{
807736f6 267 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
23721387 268 struct hlist_head *head;
bae98774
ML
269 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
270 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
23721387
SW
271 int index;
272
273 if (!hash)
274 return NULL;
275
8fdd0153 276 ether_addr_copy(search_entry.orig, addr);
23721387
SW
277 search_entry.vid = vid;
278
3b300de3 279 index = batadv_choose_backbone_gw(&search_entry, hash->size);
23721387
SW
280 head = &hash->table[index];
281
282 rcu_read_lock();
b67bfe0d 283 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
3b300de3
SE
284 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
285 &search_entry))
23721387
SW
286 continue;
287
06e56ded 288 if (!kref_get_unless_zero(&backbone_gw->refcount))
23721387
SW
289 continue;
290
291 backbone_gw_tmp = backbone_gw;
292 break;
293 }
294 rcu_read_unlock();
295
296 return backbone_gw_tmp;
297}
298
04e14be6 299/**
7e9a8c2c 300 * batadv_bla_del_backbone_claims() - delete all claims for a backbone
04e14be6
SW
301 * @backbone_gw: backbone gateway where the claims should be removed
302 */
56303d34 303static void
bae98774 304batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
23721387 305{
5bf74e9c 306 struct batadv_hashtable *hash;
b67bfe0d 307 struct hlist_node *node_tmp;
23721387 308 struct hlist_head *head;
712bbfe4 309 struct batadv_bla_claim *claim;
23721387
SW
310 int i;
311 spinlock_t *list_lock; /* protects write access to the hash lists */
312
807736f6 313 hash = backbone_gw->bat_priv->bla.claim_hash;
23721387
SW
314 if (!hash)
315 return;
316
317 for (i = 0; i < hash->size; i++) {
318 head = &hash->table[i];
319 list_lock = &hash->list_locks[i];
320
321 spin_lock_bh(list_lock);
b67bfe0d 322 hlist_for_each_entry_safe(claim, node_tmp,
23721387 323 head, hash_entry) {
23721387
SW
324 if (claim->backbone_gw != backbone_gw)
325 continue;
326
321e3e08 327 batadv_claim_put(claim);
b67bfe0d 328 hlist_del_rcu(&claim->hash_entry);
23721387
SW
329 }
330 spin_unlock_bh(list_lock);
331 }
332
3f68785e 333 /* all claims gone, initialize CRC */
5a1dd8a4 334 spin_lock_bh(&backbone_gw->crc_lock);
3964f728 335 backbone_gw->crc = BATADV_BLA_CRC_INIT;
5a1dd8a4 336 spin_unlock_bh(&backbone_gw->crc_lock);
23721387
SW
337}
338
2c53040f 339/**
7e9a8c2c 340 * batadv_bla_send_claim() - sends a claim frame according to the provided info
2c53040f 341 * @bat_priv: the bat priv with all the soft interface information
e3357189 342 * @mac: the mac address to be announced within the claim
23721387
SW
343 * @vid: the VLAN ID
344 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
23721387 345 */
6b5e971a 346static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
eb2deb6b 347 unsigned short vid, int claimtype)
23721387
SW
348{
349 struct sk_buff *skb;
350 struct ethhdr *ethhdr;
56303d34 351 struct batadv_hard_iface *primary_if;
23721387 352 struct net_device *soft_iface;
6b5e971a 353 u8 *hw_src;
96412690 354 struct batadv_bla_claim_dst local_claim_dest;
3e2f1a1b 355 __be32 zeroip = 0;
23721387 356
e5d89254 357 primary_if = batadv_primary_if_get_selected(bat_priv);
23721387
SW
358 if (!primary_if)
359 return;
360
807736f6 361 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
38ef3d1d 362 sizeof(local_claim_dest));
23721387
SW
363 local_claim_dest.type = claimtype;
364
365 soft_iface = primary_if->soft_iface;
366
367 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
368 /* IP DST: 0.0.0.0 */
369 zeroip,
370 primary_if->soft_iface,
371 /* IP SRC: 0.0.0.0 */
372 zeroip,
373 /* Ethernet DST: Broadcast */
374 NULL,
375 /* Ethernet SRC/HW SRC: originator mac */
376 primary_if->net_dev->dev_addr,
99e966fc 377 /* HW DST: FF:43:05:XX:YY:YY
23721387 378 * with XX = claim type
38ef3d1d 379 * and YY:YY = group id
23721387 380 */
6b5e971a 381 (u8 *)&local_claim_dest);
23721387
SW
382
383 if (!skb)
384 goto out;
385
386 ethhdr = (struct ethhdr *)skb->data;
6b5e971a 387 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
23721387
SW
388
389 /* now we pretend that the client would have sent this ... */
390 switch (claimtype) {
3eb8773e 391 case BATADV_CLAIM_TYPE_CLAIM:
23721387
SW
392 /* normal claim frame
393 * set Ethernet SRC to the clients mac
394 */
8fdd0153 395 ether_addr_copy(ethhdr->h_source, mac);
39c75a51 396 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 397 "%s(): CLAIM %pM on vid %d\n", __func__, mac,
f7a2bd65 398 batadv_print_vid(vid));
23721387 399 break;
3eb8773e 400 case BATADV_CLAIM_TYPE_UNCLAIM:
23721387
SW
401 /* unclaim frame
402 * set HW SRC to the clients mac
403 */
8fdd0153 404 ether_addr_copy(hw_src, mac);
39c75a51 405 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 406 "%s(): UNCLAIM %pM on vid %d\n", __func__, mac,
f7a2bd65 407 batadv_print_vid(vid));
23721387 408 break;
acd34afa 409 case BATADV_CLAIM_TYPE_ANNOUNCE:
23721387
SW
410 /* announcement frame
411 * set HW SRC to the special mac containg the crc
412 */
8fdd0153 413 ether_addr_copy(hw_src, mac);
39c75a51 414 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 415 "%s(): ANNOUNCE of %pM on vid %d\n", __func__,
f7a2bd65 416 ethhdr->h_source, batadv_print_vid(vid));
23721387 417 break;
acd34afa 418 case BATADV_CLAIM_TYPE_REQUEST:
23721387 419 /* request frame
99e966fc
SW
420 * set HW SRC and header destination to the receiving backbone
421 * gws mac
23721387 422 */
8fdd0153
AQ
423 ether_addr_copy(hw_src, mac);
424 ether_addr_copy(ethhdr->h_dest, mac);
39c75a51 425 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 426 "%s(): REQUEST of %pM to %pM on vid %d\n", __func__,
5f80df67 427 ethhdr->h_source, ethhdr->h_dest,
f7a2bd65 428 batadv_print_vid(vid));
23721387 429 break;
cd9c7bfb
SW
430 case BATADV_CLAIM_TYPE_LOOPDETECT:
431 ether_addr_copy(ethhdr->h_source, mac);
432 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
433 "%s(): LOOPDETECT of %pM to %pM on vid %d\n",
434 __func__, ethhdr->h_source, ethhdr->h_dest,
f7a2bd65 435 batadv_print_vid(vid));
cd9c7bfb
SW
436
437 break;
23721387
SW
438 }
439
10c78f58 440 if (vid & BATADV_VLAN_HAS_TAG) {
eb2deb6b
AQ
441 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
442 vid & VLAN_VID_MASK);
10c78f58
SE
443 if (!skb)
444 goto out;
445 }
23721387
SW
446
447 skb_reset_mac_header(skb);
448 skb->protocol = eth_type_trans(skb, soft_iface);
1c9b0550
ML
449 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
450 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
451 skb->len + ETH_HLEN);
23721387
SW
452
453 netif_rx(skb);
454out:
455 if (primary_if)
82047ad7 456 batadv_hardif_put(primary_if);
23721387
SW
457}
458
cd9c7bfb 459/**
7e9a8c2c 460 * batadv_bla_loopdetect_report() - worker for reporting the loop
cd9c7bfb
SW
461 * @work: work queue item
462 *
463 * Throws an uevent, as the loopdetect check function can't do that itself
464 * since the kernel may sleep while throwing uevents.
465 */
466static void batadv_bla_loopdetect_report(struct work_struct *work)
467{
468 struct batadv_bla_backbone_gw *backbone_gw;
469 struct batadv_priv *bat_priv;
470 char vid_str[6] = { '\0' };
471
472 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
473 report_work);
474 bat_priv = backbone_gw->bat_priv;
475
476 batadv_info(bat_priv->soft_iface,
477 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
f7a2bd65 478 batadv_print_vid(backbone_gw->vid));
cd9c7bfb 479 snprintf(vid_str, sizeof(vid_str), "%d",
f7a2bd65 480 batadv_print_vid(backbone_gw->vid));
cd9c7bfb
SW
481 vid_str[sizeof(vid_str) - 1] = 0;
482
483 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
484 vid_str);
485
486 batadv_backbone_gw_put(backbone_gw);
487}
488
2c53040f 489/**
7e9a8c2c 490 * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway
2c53040f 491 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
492 * @orig: the mac address of the originator
493 * @vid: the VLAN ID
e3357189 494 * @own_backbone: set if the requested backbone is local
23721387 495 *
04e14be6 496 * Return: the (possibly created) backbone gateway or NULL on error
23721387 497 */
bae98774 498static struct batadv_bla_backbone_gw *
6b5e971a 499batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
eb2deb6b 500 unsigned short vid, bool own_backbone)
23721387 501{
bae98774 502 struct batadv_bla_backbone_gw *entry;
56303d34 503 struct batadv_orig_node *orig_node;
23721387
SW
504 int hash_added;
505
3b300de3 506 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
23721387
SW
507
508 if (entry)
509 return entry;
510
39c75a51 511 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 512 "%s(): not found (%pM, %d), creating new entry\n", __func__,
f7a2bd65 513 orig, batadv_print_vid(vid));
23721387
SW
514
515 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
516 if (!entry)
517 return NULL;
518
519 entry->vid = vid;
520 entry->lasttime = jiffies;
3964f728 521 entry->crc = BATADV_BLA_CRC_INIT;
23721387 522 entry->bat_priv = bat_priv;
5a1dd8a4 523 spin_lock_init(&entry->crc_lock);
23721387 524 atomic_set(&entry->request_sent, 0);
28709878 525 atomic_set(&entry->wait_periods, 0);
8fdd0153 526 ether_addr_copy(entry->orig, orig);
cd9c7bfb 527 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
06e56ded 528 kref_init(&entry->refcount);
23721387 529
4e8389e1 530 kref_get(&entry->refcount);
807736f6 531 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
3b300de3
SE
532 batadv_compare_backbone_gw,
533 batadv_choose_backbone_gw, entry,
534 &entry->hash_entry);
23721387
SW
535
536 if (unlikely(hash_added != 0)) {
537 /* hash failed, free the structure */
538 kfree(entry);
539 return NULL;
540 }
541
95fb130d 542 /* this is a gateway now, remove any TT entry on this VLAN */
da641193 543 orig_node = batadv_orig_hash_find(bat_priv, orig);
20ff9d59 544 if (orig_node) {
95fb130d 545 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
08c36d3e 546 "became a backbone gateway");
5d967310 547 batadv_orig_node_put(orig_node);
20ff9d59 548 }
52aebd6a 549
d807f272 550 if (own_backbone) {
52aebd6a
SW
551 batadv_bla_send_announce(bat_priv, entry);
552
d807f272
SW
553 /* this will be decreased in the worker thread */
554 atomic_inc(&entry->request_sent);
28709878 555 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
d807f272
SW
556 atomic_inc(&bat_priv->bla.num_requests);
557 }
558
23721387
SW
559 return entry;
560}
561
04e14be6 562/**
7e9a8c2c 563 * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN
04e14be6
SW
564 * @bat_priv: the bat priv with all the soft interface information
565 * @primary_if: the selected primary interface
566 * @vid: VLAN identifier
567 *
568 * update or add the own backbone gw to make sure we announce
23721387
SW
569 * where we receive other backbone gws
570 */
56303d34
SE
571static void
572batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
573 struct batadv_hard_iface *primary_if,
eb2deb6b 574 unsigned short vid)
23721387 575{
bae98774 576 struct batadv_bla_backbone_gw *backbone_gw;
23721387 577
3b300de3
SE
578 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
579 primary_if->net_dev->dev_addr,
52aebd6a 580 vid, true);
23721387
SW
581 if (unlikely(!backbone_gw))
582 return;
583
584 backbone_gw->lasttime = jiffies;
c8b86c12 585 batadv_backbone_gw_put(backbone_gw);
23721387
SW
586}
587
1b371d13 588/**
7e9a8c2c 589 * batadv_bla_answer_request() - answer a bla request by sending own claims
1b371d13 590 * @bat_priv: the bat priv with all the soft interface information
e3357189 591 * @primary_if: interface where the request came on
23721387
SW
592 * @vid: the vid where the request came on
593 *
594 * Repeat all of our own claims, and finally send an ANNOUNCE frame
595 * to allow the requester another check if the CRC is correct now.
596 */
56303d34
SE
597static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
598 struct batadv_hard_iface *primary_if,
eb2deb6b 599 unsigned short vid)
23721387 600{
23721387 601 struct hlist_head *head;
5bf74e9c 602 struct batadv_hashtable *hash;
712bbfe4 603 struct batadv_bla_claim *claim;
bae98774 604 struct batadv_bla_backbone_gw *backbone_gw;
23721387
SW
605 int i;
606
39c75a51 607 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
608 "%s(): received a claim request, send all of our own claims again\n",
609 __func__);
23721387 610
3b300de3
SE
611 backbone_gw = batadv_backbone_hash_find(bat_priv,
612 primary_if->net_dev->dev_addr,
613 vid);
23721387
SW
614 if (!backbone_gw)
615 return;
616
807736f6 617 hash = bat_priv->bla.claim_hash;
23721387
SW
618 for (i = 0; i < hash->size; i++) {
619 head = &hash->table[i];
620
621 rcu_read_lock();
b67bfe0d 622 hlist_for_each_entry_rcu(claim, head, hash_entry) {
23721387
SW
623 /* only own claims are interesting */
624 if (claim->backbone_gw != backbone_gw)
625 continue;
626
3b300de3 627 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
3eb8773e 628 BATADV_CLAIM_TYPE_CLAIM);
23721387
SW
629 }
630 rcu_read_unlock();
631 }
632
633 /* finally, send an announcement frame */
3b300de3 634 batadv_bla_send_announce(bat_priv, backbone_gw);
c8b86c12 635 batadv_backbone_gw_put(backbone_gw);
23721387
SW
636}
637
1b371d13 638/**
7e9a8c2c 639 * batadv_bla_send_request() - send a request to repeat claims
1b371d13 640 * @backbone_gw: the backbone gateway from whom we are out of sync
23721387
SW
641 *
642 * When the crc is wrong, ask the backbone gateway for a full table update.
643 * After the request, it will repeat all of his own claims and finally
644 * send an announcement claim with which we can check again.
645 */
bae98774 646static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
23721387
SW
647{
648 /* first, remove all old entries */
3b300de3 649 batadv_bla_del_backbone_claims(backbone_gw);
23721387 650
39c75a51
SE
651 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
652 "Sending REQUEST to %pM\n", backbone_gw->orig);
23721387
SW
653
654 /* send request */
3b300de3 655 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
acd34afa 656 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
23721387
SW
657
658 /* no local broadcasts should be sent or received, for now. */
659 if (!atomic_read(&backbone_gw->request_sent)) {
807736f6 660 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
23721387
SW
661 atomic_set(&backbone_gw->request_sent, 1);
662 }
663}
664
1b371d13 665/**
7e9a8c2c 666 * batadv_bla_send_announce() - Send an announcement frame
1b371d13 667 * @bat_priv: the bat priv with all the soft interface information
23721387 668 * @backbone_gw: our backbone gateway which should be announced
23721387 669 */
56303d34 670static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
bae98774 671 struct batadv_bla_backbone_gw *backbone_gw)
23721387 672{
6b5e971a 673 u8 mac[ETH_ALEN];
3e2f1a1b 674 __be16 crc;
23721387 675
3b300de3 676 memcpy(mac, batadv_announce_mac, 4);
5a1dd8a4 677 spin_lock_bh(&backbone_gw->crc_lock);
23721387 678 crc = htons(backbone_gw->crc);
5a1dd8a4 679 spin_unlock_bh(&backbone_gw->crc_lock);
1a5852d8 680 memcpy(&mac[4], &crc, 2);
23721387 681
3b300de3 682 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
acd34afa 683 BATADV_CLAIM_TYPE_ANNOUNCE);
23721387
SW
684}
685
2c53040f 686/**
7e9a8c2c 687 * batadv_bla_add_claim() - Adds a claim in the claim hash
2c53040f 688 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
689 * @mac: the mac address of the claim
690 * @vid: the VLAN ID of the frame
691 * @backbone_gw: the backbone gateway which claims it
23721387 692 */
56303d34 693static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
6b5e971a 694 const u8 *mac, const unsigned short vid,
bae98774 695 struct batadv_bla_backbone_gw *backbone_gw)
23721387 696{
3db0decf 697 struct batadv_bla_backbone_gw *old_backbone_gw;
712bbfe4
ML
698 struct batadv_bla_claim *claim;
699 struct batadv_bla_claim search_claim;
3db0decf 700 bool remove_crc = false;
23721387
SW
701 int hash_added;
702
8fdd0153 703 ether_addr_copy(search_claim.addr, mac);
23721387 704 search_claim.vid = vid;
3b300de3 705 claim = batadv_claim_hash_find(bat_priv, &search_claim);
23721387
SW
706
707 /* create a new claim entry if it does not exist yet. */
708 if (!claim) {
709 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
710 if (!claim)
711 return;
712
8fdd0153 713 ether_addr_copy(claim->addr, mac);
3db0decf 714 spin_lock_init(&claim->backbone_lock);
23721387
SW
715 claim->vid = vid;
716 claim->lasttime = jiffies;
3db0decf 717 kref_get(&backbone_gw->refcount);
23721387 718 claim->backbone_gw = backbone_gw;
71b7e3d3 719 kref_init(&claim->refcount);
7282ac39 720
39c75a51 721 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
722 "%s(): adding new entry %pM, vid %d to hash ...\n",
723 __func__, mac, batadv_print_vid(vid));
7282ac39
SE
724
725 kref_get(&claim->refcount);
807736f6 726 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
3b300de3
SE
727 batadv_compare_claim,
728 batadv_choose_claim, claim,
729 &claim->hash_entry);
23721387
SW
730
731 if (unlikely(hash_added != 0)) {
732 /* only local changes happened. */
733 kfree(claim);
734 return;
735 }
736 } else {
737 claim->lasttime = jiffies;
738 if (claim->backbone_gw == backbone_gw)
739 /* no need to register a new backbone */
740 goto claim_free_ref;
741
39c75a51 742 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
743 "%s(): changing ownership for %pM, vid %d to gw %pM\n",
744 __func__, mac, batadv_print_vid(vid),
745 backbone_gw->orig);
23721387 746
3db0decf 747 remove_crc = true;
23721387 748 }
3db0decf
SE
749
750 /* replace backbone_gw atomically and adjust reference counters */
751 spin_lock_bh(&claim->backbone_lock);
752 old_backbone_gw = claim->backbone_gw;
06e56ded 753 kref_get(&backbone_gw->refcount);
23721387 754 claim->backbone_gw = backbone_gw;
3db0decf 755 spin_unlock_bh(&claim->backbone_lock);
23721387 756
3db0decf
SE
757 if (remove_crc) {
758 /* remove claim address from old backbone_gw */
759 spin_lock_bh(&old_backbone_gw->crc_lock);
760 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
761 spin_unlock_bh(&old_backbone_gw->crc_lock);
762 }
23721387 763
3db0decf
SE
764 batadv_backbone_gw_put(old_backbone_gw);
765
766 /* add claim address to new backbone_gw */
5a1dd8a4 767 spin_lock_bh(&backbone_gw->crc_lock);
23721387 768 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
5a1dd8a4 769 spin_unlock_bh(&backbone_gw->crc_lock);
23721387
SW
770 backbone_gw->lasttime = jiffies;
771
772claim_free_ref:
321e3e08 773 batadv_claim_put(claim);
23721387
SW
774}
775
3db0decf 776/**
7e9a8c2c 777 * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of
3db0decf
SE
778 * claim
779 * @claim: claim whose backbone_gw should be returned
780 *
781 * Return: valid reference to claim::backbone_gw
782 */
783static struct batadv_bla_backbone_gw *
784batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
785{
786 struct batadv_bla_backbone_gw *backbone_gw;
787
788 spin_lock_bh(&claim->backbone_lock);
789 backbone_gw = claim->backbone_gw;
790 kref_get(&backbone_gw->refcount);
791 spin_unlock_bh(&claim->backbone_lock);
792
793 return backbone_gw;
794}
795
04e14be6 796/**
7e9a8c2c 797 * batadv_bla_del_claim() - delete a claim from the claim hash
04e14be6
SW
798 * @bat_priv: the bat priv with all the soft interface information
799 * @mac: mac address of the claim to be removed
800 * @vid: VLAN id for the claim to be removed
23721387 801 */
56303d34 802static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
6b5e971a 803 const u8 *mac, const unsigned short vid)
23721387 804{
712bbfe4 805 struct batadv_bla_claim search_claim, *claim;
23721387 806
8fdd0153 807 ether_addr_copy(search_claim.addr, mac);
23721387 808 search_claim.vid = vid;
3b300de3 809 claim = batadv_claim_hash_find(bat_priv, &search_claim);
23721387
SW
810 if (!claim)
811 return;
812
22f0502e 813 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__,
f7a2bd65 814 mac, batadv_print_vid(vid));
23721387 815
807736f6 816 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
3b300de3 817 batadv_choose_claim, claim);
321e3e08 818 batadv_claim_put(claim); /* reference from the hash is gone */
23721387 819
23721387 820 /* don't need the reference from hash_find() anymore */
321e3e08 821 batadv_claim_put(claim);
23721387
SW
822}
823
62fe710f 824/**
7e9a8c2c 825 * batadv_handle_announce() - check for ANNOUNCE frame
04e14be6
SW
826 * @bat_priv: the bat priv with all the soft interface information
827 * @an_addr: announcement mac address (ARP Sender HW address)
828 * @backbone_addr: originator address of the sender (Ethernet source MAC)
829 * @vid: the VLAN ID of the frame
62fe710f 830 *
4b426b10 831 * Return: true if handled
62fe710f 832 */
4b426b10
SE
833static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
834 u8 *backbone_addr, unsigned short vid)
23721387 835{
bae98774 836 struct batadv_bla_backbone_gw *backbone_gw;
5a1dd8a4 837 u16 backbone_crc, crc;
23721387 838
3b300de3 839 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
4b426b10 840 return false;
23721387 841
52aebd6a
SW
842 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
843 false);
23721387
SW
844
845 if (unlikely(!backbone_gw))
4b426b10 846 return true;
23721387 847
23721387
SW
848 /* handle as ANNOUNCE frame */
849 backbone_gw->lasttime = jiffies;
3e2f1a1b 850 crc = ntohs(*((__be16 *)(&an_addr[4])));
23721387 851
39c75a51 852 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
853 "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
854 __func__, batadv_print_vid(vid), backbone_gw->orig, crc);
23721387 855
5a1dd8a4
SW
856 spin_lock_bh(&backbone_gw->crc_lock);
857 backbone_crc = backbone_gw->crc;
858 spin_unlock_bh(&backbone_gw->crc_lock);
859
860 if (backbone_crc != crc) {
39c75a51 861 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
22f0502e
SE
862 "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
863 __func__, backbone_gw->orig,
f7a2bd65 864 batadv_print_vid(backbone_gw->vid),
5a1dd8a4 865 backbone_crc, crc);
23721387 866
3b300de3 867 batadv_bla_send_request(backbone_gw);
23721387
SW
868 } else {
869 /* if we have sent a request and the crc was OK,
870 * we can allow traffic again.
871 */
872 if (atomic_read(&backbone_gw->request_sent)) {
807736f6 873 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
23721387
SW
874 atomic_set(&backbone_gw->request_sent, 0);
875 }
876 }
877
c8b86c12 878 batadv_backbone_gw_put(backbone_gw);
4b426b10 879 return true;
23721387
SW
880}
881
62fe710f 882/**
7e9a8c2c 883 * batadv_handle_request() - check for REQUEST frame
04e14be6
SW
884 * @bat_priv: the bat priv with all the soft interface information
885 * @primary_if: the primary hard interface of this batman soft interface
886 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
887 * @ethhdr: ethernet header of a packet
888 * @vid: the VLAN ID of the frame
62fe710f 889 *
4b426b10 890 * Return: true if handled
62fe710f 891 */
4b426b10
SE
892static bool batadv_handle_request(struct batadv_priv *bat_priv,
893 struct batadv_hard_iface *primary_if,
894 u8 *backbone_addr, struct ethhdr *ethhdr,
895 unsigned short vid)
23721387
SW
896{
897 /* check for REQUEST frame */
1eda58bf 898 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
4b426b10 899 return false;
23721387
SW
900
901 /* sanity check, this should not happen on a normal switch,
902 * we ignore it in this case.
903 */
1eda58bf 904 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
4b426b10 905 return true;
23721387 906
39c75a51 907 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
908 "%s(): REQUEST vid %d (sent by %pM)...\n",
909 __func__, batadv_print_vid(vid), ethhdr->h_source);
23721387 910
3b300de3 911 batadv_bla_answer_request(bat_priv, primary_if, vid);
4b426b10 912 return true;
23721387
SW
913}
914
62fe710f 915/**
7e9a8c2c 916 * batadv_handle_unclaim() - check for UNCLAIM frame
04e14be6
SW
917 * @bat_priv: the bat priv with all the soft interface information
918 * @primary_if: the primary hard interface of this batman soft interface
919 * @backbone_addr: originator address of the backbone (Ethernet source)
920 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
921 * @vid: the VLAN ID of the frame
62fe710f 922 *
4b426b10 923 * Return: true if handled
62fe710f 924 */
4b426b10
SE
925static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
926 struct batadv_hard_iface *primary_if,
927 u8 *backbone_addr, u8 *claim_addr,
928 unsigned short vid)
23721387 929{
bae98774 930 struct batadv_bla_backbone_gw *backbone_gw;
23721387
SW
931
932 /* unclaim in any case if it is our own */
1eda58bf
SE
933 if (primary_if && batadv_compare_eth(backbone_addr,
934 primary_if->net_dev->dev_addr))
3b300de3 935 batadv_bla_send_claim(bat_priv, claim_addr, vid,
3eb8773e 936 BATADV_CLAIM_TYPE_UNCLAIM);
23721387 937
3b300de3 938 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
23721387
SW
939
940 if (!backbone_gw)
4b426b10 941 return true;
23721387
SW
942
943 /* this must be an UNCLAIM frame */
39c75a51 944 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 945 "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__,
f7a2bd65 946 claim_addr, batadv_print_vid(vid), backbone_gw->orig);
23721387 947
3b300de3 948 batadv_bla_del_claim(bat_priv, claim_addr, vid);
c8b86c12 949 batadv_backbone_gw_put(backbone_gw);
4b426b10 950 return true;
23721387
SW
951}
952
62fe710f 953/**
7e9a8c2c 954 * batadv_handle_claim() - check for CLAIM frame
04e14be6
SW
955 * @bat_priv: the bat priv with all the soft interface information
956 * @primary_if: the primary hard interface of this batman soft interface
957 * @backbone_addr: originator address of the backbone (Ethernet Source)
958 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
959 * @vid: the VLAN ID of the frame
62fe710f 960 *
4b426b10 961 * Return: true if handled
62fe710f 962 */
4b426b10
SE
963static bool batadv_handle_claim(struct batadv_priv *bat_priv,
964 struct batadv_hard_iface *primary_if,
965 u8 *backbone_addr, u8 *claim_addr,
966 unsigned short vid)
23721387 967{
bae98774 968 struct batadv_bla_backbone_gw *backbone_gw;
23721387
SW
969
970 /* register the gateway if not yet available, and add the claim. */
971
52aebd6a
SW
972 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
973 false);
23721387
SW
974
975 if (unlikely(!backbone_gw))
4b426b10 976 return true;
23721387
SW
977
978 /* this must be a CLAIM frame */
3b300de3 979 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
1eda58bf 980 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
3b300de3 981 batadv_bla_send_claim(bat_priv, claim_addr, vid,
3eb8773e 982 BATADV_CLAIM_TYPE_CLAIM);
23721387
SW
983
984 /* TODO: we could call something like tt_local_del() here. */
985
c8b86c12 986 batadv_backbone_gw_put(backbone_gw);
4b426b10 987 return true;
23721387
SW
988}
989
2c53040f 990/**
7e9a8c2c 991 * batadv_check_claim_group() - check for claim group membership
2c53040f 992 * @bat_priv: the bat priv with all the soft interface information
e3357189 993 * @primary_if: the primary interface of this batman interface
38ef3d1d
SW
994 * @hw_src: the Hardware source in the ARP Header
995 * @hw_dst: the Hardware destination in the ARP Header
996 * @ethhdr: pointer to the Ethernet header of the claim frame
997 *
998 * checks if it is a claim packet and if its on the same group.
999 * This function also applies the group ID of the sender
1000 * if it is in the same mesh.
1001 *
62fe710f 1002 * Return:
38ef3d1d
SW
1003 * 2 - if it is a claim packet and on the same group
1004 * 1 - if is a claim packet from another group
1005 * 0 - if it is not a claim packet
1006 */
56303d34
SE
1007static int batadv_check_claim_group(struct batadv_priv *bat_priv,
1008 struct batadv_hard_iface *primary_if,
6b5e971a 1009 u8 *hw_src, u8 *hw_dst,
3b300de3 1010 struct ethhdr *ethhdr)
38ef3d1d 1011{
6b5e971a 1012 u8 *backbone_addr;
56303d34 1013 struct batadv_orig_node *orig_node;
96412690 1014 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
38ef3d1d 1015
96412690 1016 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
807736f6 1017 bla_dst_own = &bat_priv->bla.claim_dest;
38ef3d1d 1018
38ef3d1d
SW
1019 /* if announcement packet, use the source,
1020 * otherwise assume it is in the hw_src
1021 */
1022 switch (bla_dst->type) {
3eb8773e 1023 case BATADV_CLAIM_TYPE_CLAIM:
38ef3d1d
SW
1024 backbone_addr = hw_src;
1025 break;
acd34afa
SE
1026 case BATADV_CLAIM_TYPE_REQUEST:
1027 case BATADV_CLAIM_TYPE_ANNOUNCE:
3eb8773e 1028 case BATADV_CLAIM_TYPE_UNCLAIM:
38ef3d1d
SW
1029 backbone_addr = ethhdr->h_source;
1030 break;
1031 default:
1032 return 0;
1033 }
1034
1035 /* don't accept claim frames from ourselves */
1eda58bf 1036 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
38ef3d1d
SW
1037 return 0;
1038
1039 /* if its already the same group, it is fine. */
1040 if (bla_dst->group == bla_dst_own->group)
1041 return 2;
1042
1043 /* lets see if this originator is in our mesh */
da641193 1044 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
38ef3d1d
SW
1045
1046 /* dont accept claims from gateways which are not in
1047 * the same mesh or group.
1048 */
1049 if (!orig_node)
1050 return 1;
1051
1052 /* if our mesh friends mac is bigger, use it for ourselves. */
1053 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
39c75a51 1054 batadv_dbg(BATADV_DBG_BLA, bat_priv,
39a32991 1055 "taking other backbones claim group: %#.4x\n",
1eda58bf 1056 ntohs(bla_dst->group));
38ef3d1d
SW
1057 bla_dst_own->group = bla_dst->group;
1058 }
1059
5d967310 1060 batadv_orig_node_put(orig_node);
38ef3d1d
SW
1061
1062 return 2;
1063}
1064
1b371d13 1065/**
7e9a8c2c 1066 * batadv_bla_process_claim() - Check if this is a claim frame, and process it
1b371d13 1067 * @bat_priv: the bat priv with all the soft interface information
e3357189 1068 * @primary_if: the primary hard interface of this batman soft interface
23721387
SW
1069 * @skb: the frame to be checked
1070 *
4b426b10 1071 * Return: true if it was a claim frame, otherwise return false to
23721387
SW
1072 * tell the callee that it can use the frame on its own.
1073 */
4b426b10
SE
1074static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1075 struct batadv_hard_iface *primary_if,
1076 struct sk_buff *skb)
23721387 1077{
d46b6bfa 1078 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
6b5e971a 1079 u8 *hw_src, *hw_dst;
d46b6bfa 1080 struct vlan_hdr *vhdr, vhdr_buf;
c018ad3d 1081 struct ethhdr *ethhdr;
23721387 1082 struct arphdr *arphdr;
c018ad3d 1083 unsigned short vid;
d46b6bfa 1084 int vlan_depth = 0;
293e9338 1085 __be16 proto;
23721387 1086 int headlen;
38ef3d1d 1087 int ret;
23721387 1088
c018ad3d 1089 vid = batadv_get_vid(skb, 0);
7ed4be95 1090 ethhdr = eth_hdr(skb);
23721387 1091
c018ad3d
AQ
1092 proto = ethhdr->h_proto;
1093 headlen = ETH_HLEN;
1094 if (vid & BATADV_VLAN_HAS_TAG) {
d46b6bfa
SW
1095 /* Traverse the VLAN/Ethertypes.
1096 *
1097 * At this point it is known that the first protocol is a VLAN
1098 * header, so start checking at the encapsulated protocol.
1099 *
1100 * The depth of the VLAN headers is recorded to drop BLA claim
1101 * frames encapsulated into multiple VLAN headers (QinQ).
1102 */
1103 do {
1104 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1105 &vhdr_buf);
1106 if (!vhdr)
4b426b10 1107 return false;
d46b6bfa
SW
1108
1109 proto = vhdr->h_vlan_encapsulated_proto;
1110 headlen += VLAN_HLEN;
1111 vlan_depth++;
1112 } while (proto == htons(ETH_P_8021Q));
23721387
SW
1113 }
1114
293e9338 1115 if (proto != htons(ETH_P_ARP))
4b426b10 1116 return false; /* not a claim frame */
23721387
SW
1117
1118 /* this must be a ARP frame. check if it is a claim. */
1119
1120 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
4b426b10 1121 return false;
23721387
SW
1122
1123 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
7ed4be95 1124 ethhdr = eth_hdr(skb);
6b5e971a 1125 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
23721387
SW
1126
1127 /* Check whether the ARP frame carries a valid
1128 * IP information
1129 */
23721387 1130 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
4b426b10 1131 return false;
23721387 1132 if (arphdr->ar_pro != htons(ETH_P_IP))
4b426b10 1133 return false;
23721387 1134 if (arphdr->ar_hln != ETH_ALEN)
4b426b10 1135 return false;
23721387 1136 if (arphdr->ar_pln != 4)
4b426b10 1137 return false;
23721387 1138
6b5e971a 1139 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
23721387 1140 hw_dst = hw_src + ETH_ALEN + 4;
96412690 1141 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
d46b6bfa
SW
1142 bla_dst_own = &bat_priv->bla.claim_dest;
1143
1144 /* check if it is a claim frame in general */
1145 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1146 sizeof(bla_dst->magic)) != 0)
4b426b10 1147 return false;
d46b6bfa
SW
1148
1149 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1150 * drop that, as this is not supported by BLA but should also not be
1151 * sent via the mesh.
1152 */
1153 if (vlan_depth > 1)
4b426b10 1154 return true;
23721387 1155
cd9c7bfb
SW
1156 /* Let the loopdetect frames on the mesh in any case. */
1157 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
4fd261bf 1158 return false;
cd9c7bfb 1159
23721387 1160 /* check if it is a claim frame. */
3b300de3
SE
1161 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1162 ethhdr);
38ef3d1d 1163 if (ret == 1)
39c75a51 1164 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
1165 "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1166 __func__, ethhdr->h_source, batadv_print_vid(vid),
1167 hw_src, hw_dst);
38ef3d1d
SW
1168
1169 if (ret < 2)
4b426b10 1170 return !!ret;
23721387
SW
1171
1172 /* become a backbone gw ourselves on this vlan if not happened yet */
3b300de3 1173 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
23721387
SW
1174
1175 /* check for the different types of claim frames ... */
1176 switch (bla_dst->type) {
3eb8773e 1177 case BATADV_CLAIM_TYPE_CLAIM:
3b300de3
SE
1178 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1179 ethhdr->h_source, vid))
4b426b10 1180 return true;
23721387 1181 break;
3eb8773e 1182 case BATADV_CLAIM_TYPE_UNCLAIM:
3b300de3
SE
1183 if (batadv_handle_unclaim(bat_priv, primary_if,
1184 ethhdr->h_source, hw_src, vid))
4b426b10 1185 return true;
23721387
SW
1186 break;
1187
acd34afa 1188 case BATADV_CLAIM_TYPE_ANNOUNCE:
3b300de3
SE
1189 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1190 vid))
4b426b10 1191 return true;
23721387 1192 break;
acd34afa 1193 case BATADV_CLAIM_TYPE_REQUEST:
3b300de3
SE
1194 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1195 vid))
4b426b10 1196 return true;
23721387
SW
1197 break;
1198 }
1199
39c75a51 1200 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
1201 "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1202 __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src,
1203 hw_dst);
4b426b10 1204 return true;
23721387
SW
1205}
1206
04e14be6 1207/**
7e9a8c2c 1208 * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or
04e14be6
SW
1209 * immediately
1210 * @bat_priv: the bat priv with all the soft interface information
1211 * @now: whether the whole hash shall be wiped now
1212 *
1213 * Check when we last heard from other nodes, and remove them in case of
23721387
SW
1214 * a time out, or clean all backbone gws if now is set.
1215 */
56303d34 1216static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
23721387 1217{
bae98774 1218 struct batadv_bla_backbone_gw *backbone_gw;
b67bfe0d 1219 struct hlist_node *node_tmp;
23721387 1220 struct hlist_head *head;
5bf74e9c 1221 struct batadv_hashtable *hash;
23721387
SW
1222 spinlock_t *list_lock; /* protects write access to the hash lists */
1223 int i;
1224
807736f6 1225 hash = bat_priv->bla.backbone_hash;
23721387
SW
1226 if (!hash)
1227 return;
1228
1229 for (i = 0; i < hash->size; i++) {
1230 head = &hash->table[i];
1231 list_lock = &hash->list_locks[i];
1232
1233 spin_lock_bh(list_lock);
b67bfe0d 1234 hlist_for_each_entry_safe(backbone_gw, node_tmp,
23721387
SW
1235 head, hash_entry) {
1236 if (now)
1237 goto purge_now;
1eda58bf 1238 if (!batadv_has_timed_out(backbone_gw->lasttime,
42d0b044 1239 BATADV_BLA_BACKBONE_TIMEOUT))
23721387
SW
1240 continue;
1241
39c75a51 1242 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
22f0502e
SE
1243 "%s(): backbone gw %pM timed out\n",
1244 __func__, backbone_gw->orig);
23721387
SW
1245
1246purge_now:
1247 /* don't wait for the pending request anymore */
1248 if (atomic_read(&backbone_gw->request_sent))
807736f6 1249 atomic_dec(&bat_priv->bla.num_requests);
23721387 1250
3b300de3 1251 batadv_bla_del_backbone_claims(backbone_gw);
23721387 1252
b67bfe0d 1253 hlist_del_rcu(&backbone_gw->hash_entry);
c8b86c12 1254 batadv_backbone_gw_put(backbone_gw);
23721387
SW
1255 }
1256 spin_unlock_bh(list_lock);
1257 }
1258}
1259
2c53040f 1260/**
7e9a8c2c 1261 * batadv_bla_purge_claims() - Remove claims after a timeout or immediately
2c53040f 1262 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
1263 * @primary_if: the selected primary interface, may be NULL if now is set
1264 * @now: whether the whole hash shall be wiped now
1265 *
1266 * Check when we heard last time from our own claims, and remove them in case of
1267 * a time out, or clean all claims if now is set
1268 */
56303d34
SE
1269static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1270 struct batadv_hard_iface *primary_if,
1271 int now)
23721387 1272{
3db0decf 1273 struct batadv_bla_backbone_gw *backbone_gw;
712bbfe4 1274 struct batadv_bla_claim *claim;
23721387 1275 struct hlist_head *head;
5bf74e9c 1276 struct batadv_hashtable *hash;
23721387
SW
1277 int i;
1278
807736f6 1279 hash = bat_priv->bla.claim_hash;
23721387
SW
1280 if (!hash)
1281 return;
1282
1283 for (i = 0; i < hash->size; i++) {
1284 head = &hash->table[i];
1285
1286 rcu_read_lock();
b67bfe0d 1287 hlist_for_each_entry_rcu(claim, head, hash_entry) {
3db0decf 1288 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
23721387
SW
1289 if (now)
1290 goto purge_now;
3db0decf
SE
1291
1292 if (!batadv_compare_eth(backbone_gw->orig,
1eda58bf 1293 primary_if->net_dev->dev_addr))
3db0decf
SE
1294 goto skip;
1295
1eda58bf 1296 if (!batadv_has_timed_out(claim->lasttime,
42d0b044 1297 BATADV_BLA_CLAIM_TIMEOUT))
3db0decf 1298 goto skip;
23721387 1299
39c75a51 1300 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 1301 "%s(): timed out.\n", __func__);
23721387
SW
1302
1303purge_now:
4dd72f73 1304 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e 1305 "%s(): %pM, vid %d\n", __func__,
4dd72f73
AP
1306 claim->addr, claim->vid);
1307
3b300de3 1308 batadv_handle_unclaim(bat_priv, primary_if,
3db0decf 1309 backbone_gw->orig,
3b300de3 1310 claim->addr, claim->vid);
3db0decf
SE
1311skip:
1312 batadv_backbone_gw_put(backbone_gw);
23721387
SW
1313 }
1314 rcu_read_unlock();
1315 }
1316}
1317
2c53040f 1318/**
7e9a8c2c 1319 * batadv_bla_update_orig_address() - Update the backbone gateways when the own
04e14be6 1320 * originator address changes
2c53040f 1321 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
1322 * @primary_if: the new selected primary_if
1323 * @oldif: the old primary interface, may be NULL
23721387 1324 */
56303d34
SE
1325void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1326 struct batadv_hard_iface *primary_if,
1327 struct batadv_hard_iface *oldif)
23721387 1328{
bae98774 1329 struct batadv_bla_backbone_gw *backbone_gw;
23721387 1330 struct hlist_head *head;
5bf74e9c 1331 struct batadv_hashtable *hash;
807736f6 1332 __be16 group;
23721387
SW
1333 int i;
1334
38ef3d1d 1335 /* reset bridge loop avoidance group id */
807736f6
SE
1336 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1337 bat_priv->bla.claim_dest.group = group;
38ef3d1d 1338
d5b4c93e
SW
1339 /* purge everything when bridge loop avoidance is turned off */
1340 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1341 oldif = NULL;
1342
23721387 1343 if (!oldif) {
3b300de3
SE
1344 batadv_bla_purge_claims(bat_priv, NULL, 1);
1345 batadv_bla_purge_backbone_gw(bat_priv, 1);
23721387
SW
1346 return;
1347 }
1348
807736f6 1349 hash = bat_priv->bla.backbone_hash;
23721387
SW
1350 if (!hash)
1351 return;
1352
1353 for (i = 0; i < hash->size; i++) {
1354 head = &hash->table[i];
1355
1356 rcu_read_lock();
b67bfe0d 1357 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
23721387 1358 /* own orig still holds the old value. */
1eda58bf
SE
1359 if (!batadv_compare_eth(backbone_gw->orig,
1360 oldif->net_dev->dev_addr))
23721387
SW
1361 continue;
1362
8fdd0153
AQ
1363 ether_addr_copy(backbone_gw->orig,
1364 primary_if->net_dev->dev_addr);
23721387
SW
1365 /* send an announce frame so others will ask for our
1366 * claims and update their tables.
1367 */
3b300de3 1368 batadv_bla_send_announce(bat_priv, backbone_gw);
23721387
SW
1369 }
1370 rcu_read_unlock();
1371 }
1372}
1373
cd9c7bfb 1374/**
7e9a8c2c 1375 * batadv_bla_send_loopdetect() - send a loopdetect frame
cd9c7bfb
SW
1376 * @bat_priv: the bat priv with all the soft interface information
1377 * @backbone_gw: the backbone gateway for which a loop should be detected
1378 *
1379 * To detect loops that the bridge loop avoidance can't handle, send a loop
1380 * detection packet on the backbone. Unlike other BLA frames, this frame will
1381 * be allowed on the mesh by other nodes. If it is received on the mesh, this
1382 * indicates that there is a loop.
1383 */
1384static void
1385batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1386 struct batadv_bla_backbone_gw *backbone_gw)
1387{
1388 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1389 backbone_gw->vid);
1390 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1391 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1392}
1393
d68081a2 1394/**
7e9a8c2c 1395 * batadv_bla_status_update() - purge bla interfaces if necessary
d68081a2
SW
1396 * @net_dev: the soft interface net device
1397 */
1398void batadv_bla_status_update(struct net_device *net_dev)
1399{
1400 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1401 struct batadv_hard_iface *primary_if;
1402
1403 primary_if = batadv_primary_if_get_selected(bat_priv);
1404 if (!primary_if)
1405 return;
1406
1407 /* this function already purges everything when bla is disabled,
1408 * so just call that one.
1409 */
1410 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
82047ad7 1411 batadv_hardif_put(primary_if);
d68081a2
SW
1412}
1413
04e14be6 1414/**
7e9a8c2c 1415 * batadv_bla_periodic_work() - performs periodic bla work
04e14be6
SW
1416 * @work: kernel work struct
1417 *
1418 * periodic work to do:
23721387
SW
1419 * * purge structures when they are too old
1420 * * send announcements
1421 */
3b300de3 1422static void batadv_bla_periodic_work(struct work_struct *work)
23721387 1423{
bbb1f90e 1424 struct delayed_work *delayed_work;
56303d34 1425 struct batadv_priv *bat_priv;
807736f6 1426 struct batadv_priv_bla *priv_bla;
23721387 1427 struct hlist_head *head;
bae98774 1428 struct batadv_bla_backbone_gw *backbone_gw;
5bf74e9c 1429 struct batadv_hashtable *hash;
56303d34 1430 struct batadv_hard_iface *primary_if;
cd9c7bfb 1431 bool send_loopdetect = false;
23721387
SW
1432 int i;
1433
4ba4bc0f 1434 delayed_work = to_delayed_work(work);
807736f6
SE
1435 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1436 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
e5d89254 1437 primary_if = batadv_primary_if_get_selected(bat_priv);
23721387
SW
1438 if (!primary_if)
1439 goto out;
1440
3b300de3
SE
1441 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1442 batadv_bla_purge_backbone_gw(bat_priv, 0);
23721387
SW
1443
1444 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1445 goto out;
1446
cd9c7bfb
SW
1447 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1448 /* set a new random mac address for the next bridge loop
1449 * detection frames. Set the locally administered bit to avoid
1450 * collisions with users mac addresses.
1451 */
6c1f0a1f 1452 eth_random_addr(bat_priv->bla.loopdetect_addr);
cd9c7bfb
SW
1453 bat_priv->bla.loopdetect_addr[0] = 0xba;
1454 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1455 bat_priv->bla.loopdetect_lasttime = jiffies;
1456 atomic_set(&bat_priv->bla.loopdetect_next,
1457 BATADV_BLA_LOOPDETECT_PERIODS);
1458
1459 /* mark for sending loop detect on all VLANs */
1460 send_loopdetect = true;
1461 }
1462
807736f6 1463 hash = bat_priv->bla.backbone_hash;
23721387
SW
1464 if (!hash)
1465 goto out;
1466
1467 for (i = 0; i < hash->size; i++) {
1468 head = &hash->table[i];
1469
1470 rcu_read_lock();
b67bfe0d 1471 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1eda58bf
SE
1472 if (!batadv_compare_eth(backbone_gw->orig,
1473 primary_if->net_dev->dev_addr))
23721387
SW
1474 continue;
1475
1476 backbone_gw->lasttime = jiffies;
1477
3b300de3 1478 batadv_bla_send_announce(bat_priv, backbone_gw);
cd9c7bfb
SW
1479 if (send_loopdetect)
1480 batadv_bla_send_loopdetect(bat_priv,
1481 backbone_gw);
d807f272
SW
1482
1483 /* request_sent is only set after creation to avoid
1484 * problems when we are not yet known as backbone gw
1485 * in the backbone.
1486 *
28709878
SW
1487 * We can reset this now after we waited some periods
1488 * to give bridge forward delays and bla group forming
1489 * some grace time.
d807f272
SW
1490 */
1491
1492 if (atomic_read(&backbone_gw->request_sent) == 0)
1493 continue;
1494
28709878
SW
1495 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1496 continue;
1497
d807f272
SW
1498 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1499 atomic_set(&backbone_gw->request_sent, 0);
23721387
SW
1500 }
1501 rcu_read_unlock();
1502 }
1503out:
1504 if (primary_if)
82047ad7 1505 batadv_hardif_put(primary_if);
23721387 1506
72414442
AQ
1507 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1508 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
23721387
SW
1509}
1510
5d52dad2
SE
1511/* The hash for claim and backbone hash receive the same key because they
1512 * are getting initialized by hash_new with the same key. Reinitializing
1513 * them with to different keys to allow nested locking without generating
1514 * lockdep warnings
1515 */
3b300de3
SE
1516static struct lock_class_key batadv_claim_hash_lock_class_key;
1517static struct lock_class_key batadv_backbone_hash_lock_class_key;
5d52dad2 1518
04e14be6 1519/**
7e9a8c2c 1520 * batadv_bla_init() - initialize all bla structures
04e14be6
SW
1521 * @bat_priv: the bat priv with all the soft interface information
1522 *
1523 * Return: 0 on success, < 0 on error.
1524 */
56303d34 1525int batadv_bla_init(struct batadv_priv *bat_priv)
23721387 1526{
fe2da6ff 1527 int i;
6b5e971a 1528 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
56303d34 1529 struct batadv_hard_iface *primary_if;
6b5e971a 1530 u16 crc;
807736f6 1531 unsigned long entrytime;
fe2da6ff 1532
7dac7b76
LL
1533 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1534
39c75a51 1535 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
23721387 1536
38ef3d1d 1537 /* setting claim destination address */
807736f6
SE
1538 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1539 bat_priv->bla.claim_dest.type = 0;
e5d89254 1540 primary_if = batadv_primary_if_get_selected(bat_priv);
38ef3d1d 1541 if (primary_if) {
807736f6
SE
1542 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1543 bat_priv->bla.claim_dest.group = htons(crc);
82047ad7 1544 batadv_hardif_put(primary_if);
38ef3d1d 1545 } else {
807736f6 1546 bat_priv->bla.claim_dest.group = 0; /* will be set later */
38ef3d1d
SW
1547 }
1548
fe2da6ff 1549 /* initialize the duplicate list */
807736f6 1550 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
42d0b044 1551 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
807736f6
SE
1552 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1553 bat_priv->bla.bcast_duplist_curr = 0;
fe2da6ff 1554
cd9c7bfb
SW
1555 atomic_set(&bat_priv->bla.loopdetect_next,
1556 BATADV_BLA_LOOPDETECT_PERIODS);
1557
807736f6 1558 if (bat_priv->bla.claim_hash)
5346c35e 1559 return 0;
23721387 1560
807736f6
SE
1561 bat_priv->bla.claim_hash = batadv_hash_new(128);
1562 bat_priv->bla.backbone_hash = batadv_hash_new(32);
23721387 1563
807736f6 1564 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
5346c35e 1565 return -ENOMEM;
23721387 1566
807736f6 1567 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
3b300de3 1568 &batadv_claim_hash_lock_class_key);
807736f6 1569 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
3b300de3 1570 &batadv_backbone_hash_lock_class_key);
5d52dad2 1571
39c75a51 1572 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
23721387 1573
72414442
AQ
1574 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1575
1576 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1577 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
5346c35e 1578 return 0;
23721387
SW
1579}
1580
2c53040f 1581/**
7e9a8c2c 1582 * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup.
2c53040f 1583 * @bat_priv: the bat priv with all the soft interface information
004e86fc 1584 * @skb: contains the bcast_packet to be checked
fe2da6ff
SW
1585 *
1586 * check if it is on our broadcast list. Another gateway might
1587 * have sent the same packet because it is connected to the same backbone,
1588 * so we have to remove this duplicate.
1589 *
1590 * This is performed by checking the CRC, which will tell us
1591 * with a good chance that it is the same packet. If it is furthermore
1592 * sent by another host, drop it. We allow equal packets from
1593 * the same host however as this might be intended.
04e14be6 1594 *
4b426b10 1595 * Return: true if a packet is in the duplicate list, false otherwise.
9cfc7bd6 1596 */
4b426b10
SE
1597bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1598 struct sk_buff *skb)
fe2da6ff 1599{
4b426b10 1600 int i, curr;
004e86fc
SW
1601 __be32 crc;
1602 struct batadv_bcast_packet *bcast_packet;
56303d34 1603 struct batadv_bcast_duplist_entry *entry;
4b426b10 1604 bool ret = false;
fe2da6ff 1605
004e86fc 1606 bcast_packet = (struct batadv_bcast_packet *)skb->data;
fe2da6ff
SW
1607
1608 /* calculate the crc ... */
004e86fc 1609 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
fe2da6ff 1610
7dac7b76
LL
1611 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1612
42d0b044 1613 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
807736f6
SE
1614 curr = (bat_priv->bla.bcast_duplist_curr + i);
1615 curr %= BATADV_DUPLIST_SIZE;
1616 entry = &bat_priv->bla.bcast_duplist[curr];
fe2da6ff
SW
1617
1618 /* we can stop searching if the entry is too old ;
1619 * later entries will be even older
1620 */
42d0b044
SE
1621 if (batadv_has_timed_out(entry->entrytime,
1622 BATADV_DUPLIST_TIMEOUT))
fe2da6ff
SW
1623 break;
1624
1625 if (entry->crc != crc)
1626 continue;
1627
1eda58bf 1628 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
fe2da6ff
SW
1629 continue;
1630
1631 /* this entry seems to match: same crc, not too old,
4b426b10 1632 * and from another gw. therefore return true to forbid it.
fe2da6ff 1633 */
4b426b10 1634 ret = true;
7dac7b76 1635 goto out;
fe2da6ff 1636 }
7dac7b76 1637 /* not found, add a new entry (overwrite the oldest entry)
3f68785e 1638 * and allow it, its the first occurrence.
7dac7b76 1639 */
807736f6 1640 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
42d0b044 1641 curr %= BATADV_DUPLIST_SIZE;
807736f6 1642 entry = &bat_priv->bla.bcast_duplist[curr];
fe2da6ff
SW
1643 entry->crc = crc;
1644 entry->entrytime = jiffies;
8fdd0153 1645 ether_addr_copy(entry->orig, bcast_packet->orig);
807736f6 1646 bat_priv->bla.bcast_duplist_curr = curr;
fe2da6ff 1647
7dac7b76
LL
1648out:
1649 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1650
1651 return ret;
fe2da6ff
SW
1652}
1653
1b371d13 1654/**
7e9a8c2c 1655 * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for
04e14be6 1656 * the VLAN identified by vid.
1b371d13 1657 * @bat_priv: the bat priv with all the soft interface information
20ff9d59 1658 * @orig: originator mac address
cfd4f757 1659 * @vid: VLAN identifier
20ff9d59 1660 *
62fe710f 1661 * Return: true if orig is a backbone for this vid, false otherwise.
20ff9d59 1662 */
6b5e971a 1663bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
cfd4f757 1664 unsigned short vid)
20ff9d59 1665{
807736f6 1666 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
20ff9d59 1667 struct hlist_head *head;
bae98774 1668 struct batadv_bla_backbone_gw *backbone_gw;
20ff9d59
SW
1669 int i;
1670
1671 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
cfd4f757 1672 return false;
20ff9d59
SW
1673
1674 if (!hash)
cfd4f757 1675 return false;
20ff9d59
SW
1676
1677 for (i = 0; i < hash->size; i++) {
1678 head = &hash->table[i];
1679
1680 rcu_read_lock();
b67bfe0d 1681 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
cfd4f757
AQ
1682 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1683 backbone_gw->vid == vid) {
20ff9d59 1684 rcu_read_unlock();
cfd4f757 1685 return true;
20ff9d59
SW
1686 }
1687 }
1688 rcu_read_unlock();
1689 }
1690
cfd4f757 1691 return false;
20ff9d59
SW
1692}
1693
2c53040f 1694/**
7e9a8c2c 1695 * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN
2c53040f 1696 * @skb: the frame to be checked
23721387
SW
1697 * @orig_node: the orig_node of the frame
1698 * @hdr_size: maximum length of the frame
1699 *
4b426b10
SE
1700 * Return: true if the orig_node is also a gateway on the soft interface,
1701 * otherwise it returns false.
23721387 1702 */
4b426b10
SE
1703bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1704 struct batadv_orig_node *orig_node, int hdr_size)
23721387 1705{
bae98774 1706 struct batadv_bla_backbone_gw *backbone_gw;
c018ad3d 1707 unsigned short vid;
23721387
SW
1708
1709 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
4b426b10 1710 return false;
23721387
SW
1711
1712 /* first, find out the vid. */
0d125074 1713 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
4b426b10 1714 return false;
23721387 1715
c018ad3d 1716 vid = batadv_get_vid(skb, hdr_size);
23721387
SW
1717
1718 /* see if this originator is a backbone gw for this VLAN */
3b300de3
SE
1719 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1720 orig_node->orig, vid);
23721387 1721 if (!backbone_gw)
4b426b10 1722 return false;
23721387 1723
c8b86c12 1724 batadv_backbone_gw_put(backbone_gw);
4b426b10 1725 return true;
23721387
SW
1726}
1727
04e14be6 1728/**
7e9a8c2c 1729 * batadv_bla_free() - free all bla structures
04e14be6
SW
1730 * @bat_priv: the bat priv with all the soft interface information
1731 *
1732 * for softinterface free or module unload
1733 */
56303d34 1734void batadv_bla_free(struct batadv_priv *bat_priv)
23721387 1735{
56303d34 1736 struct batadv_hard_iface *primary_if;
23721387 1737
807736f6 1738 cancel_delayed_work_sync(&bat_priv->bla.work);
e5d89254 1739 primary_if = batadv_primary_if_get_selected(bat_priv);
23721387 1740
807736f6 1741 if (bat_priv->bla.claim_hash) {
3b300de3 1742 batadv_bla_purge_claims(bat_priv, primary_if, 1);
807736f6
SE
1743 batadv_hash_destroy(bat_priv->bla.claim_hash);
1744 bat_priv->bla.claim_hash = NULL;
23721387 1745 }
807736f6 1746 if (bat_priv->bla.backbone_hash) {
3b300de3 1747 batadv_bla_purge_backbone_gw(bat_priv, 1);
807736f6
SE
1748 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1749 bat_priv->bla.backbone_hash = NULL;
23721387
SW
1750 }
1751 if (primary_if)
82047ad7 1752 batadv_hardif_put(primary_if);
23721387
SW
1753}
1754
cd9c7bfb 1755/**
7e9a8c2c 1756 * batadv_bla_loopdetect_check() - check and handle a detected loop
cd9c7bfb
SW
1757 * @bat_priv: the bat priv with all the soft interface information
1758 * @skb: the packet to check
1759 * @primary_if: interface where the request came on
1760 * @vid: the VLAN ID of the frame
1761 *
1762 * Checks if this packet is a loop detect frame which has been sent by us,
1763 * throw an uevent and log the event if that is the case.
1764 *
1765 * Return: true if it is a loop detect frame which is to be dropped, false
1766 * otherwise.
1767 */
1768static bool
1769batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1770 struct batadv_hard_iface *primary_if,
1771 unsigned short vid)
1772{
1773 struct batadv_bla_backbone_gw *backbone_gw;
1774 struct ethhdr *ethhdr;
5af96b9c 1775 bool ret;
cd9c7bfb
SW
1776
1777 ethhdr = eth_hdr(skb);
1778
1779 /* Only check for the MAC address and skip more checks here for
1780 * performance reasons - this function is on the hotpath, after all.
1781 */
1782 if (!batadv_compare_eth(ethhdr->h_source,
1783 bat_priv->bla.loopdetect_addr))
1784 return false;
1785
1786 /* If the packet came too late, don't forward it on the mesh
1787 * but don't consider that as loop. It might be a coincidence.
1788 */
1789 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1790 BATADV_BLA_LOOPDETECT_TIMEOUT))
1791 return true;
1792
1793 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1794 primary_if->net_dev->dev_addr,
1795 vid, true);
1796 if (unlikely(!backbone_gw))
1797 return true;
1798
5af96b9c
ML
1799 ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1800
1801 /* backbone_gw is unreferenced in the report work function function
1802 * if queue_work() call was successful
1803 */
1804 if (!ret)
1805 batadv_backbone_gw_put(backbone_gw);
cd9c7bfb
SW
1806
1807 return true;
1808}
1809
2c53040f 1810/**
7e9a8c2c 1811 * batadv_bla_rx() - check packets coming from the mesh.
2c53040f 1812 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
1813 * @skb: the frame to be checked
1814 * @vid: the VLAN ID of the frame
2d3f6ccc 1815 * @is_bcast: the packet came in a broadcast packet type.
23721387 1816 *
04e14be6 1817 * batadv_bla_rx avoidance checks if:
23721387
SW
1818 * * we have to race for a claim
1819 * * if the frame is allowed on the LAN
1820 *
62fe710f
SE
1821 * in these cases, the skb is further handled by this function
1822 *
4b426b10
SE
1823 * Return: true if handled, otherwise it returns false and the caller shall
1824 * further process the skb.
23721387 1825 */
4b426b10
SE
1826bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1827 unsigned short vid, bool is_bcast)
23721387 1828{
3db0decf 1829 struct batadv_bla_backbone_gw *backbone_gw;
23721387 1830 struct ethhdr *ethhdr;
712bbfe4 1831 struct batadv_bla_claim search_claim, *claim = NULL;
56303d34 1832 struct batadv_hard_iface *primary_if;
3db0decf 1833 bool own_claim;
4b426b10 1834 bool ret;
23721387 1835
7ed4be95 1836 ethhdr = eth_hdr(skb);
23721387 1837
e5d89254 1838 primary_if = batadv_primary_if_get_selected(bat_priv);
23721387
SW
1839 if (!primary_if)
1840 goto handled;
1841
1842 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1843 goto allow;
1844
cd9c7bfb
SW
1845 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1846 goto handled;
1847
807736f6 1848 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
23721387 1849 /* don't allow broadcasts while requests are in flight */
2d3f6ccc 1850 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
23721387
SW
1851 goto handled;
1852
8fdd0153 1853 ether_addr_copy(search_claim.addr, ethhdr->h_source);
23721387 1854 search_claim.vid = vid;
3b300de3 1855 claim = batadv_claim_hash_find(bat_priv, &search_claim);
23721387
SW
1856
1857 if (!claim) {
1858 /* possible optimization: race for a claim */
1859 /* No claim exists yet, claim it for us!
1860 */
4dd72f73
AP
1861
1862 batadv_dbg(BATADV_DBG_BLA, bat_priv,
22f0502e
SE
1863 "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n",
1864 __func__, ethhdr->h_source,
4dd72f73
AP
1865 batadv_is_my_client(bat_priv,
1866 ethhdr->h_source, vid) ?
1867 "yes" : "no");
3b300de3
SE
1868 batadv_handle_claim(bat_priv, primary_if,
1869 primary_if->net_dev->dev_addr,
1870 ethhdr->h_source, vid);
23721387
SW
1871 goto allow;
1872 }
1873
1874 /* if it is our own claim ... */
3db0decf
SE
1875 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1876 own_claim = batadv_compare_eth(backbone_gw->orig,
1877 primary_if->net_dev->dev_addr);
1878 batadv_backbone_gw_put(backbone_gw);
1879
1880 if (own_claim) {
23721387
SW
1881 /* ... allow it in any case */
1882 claim->lasttime = jiffies;
1883 goto allow;
1884 }
1885
1886 /* if it is a broadcast ... */
2d3f6ccc
SW
1887 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1888 /* ... drop it. the responsible gateway is in charge.
1889 *
1890 * We need to check is_bcast because with the gateway
1891 * feature, broadcasts (like DHCP requests) may be sent
1892 * using a unicast packet type.
1893 */
23721387
SW
1894 goto handled;
1895 } else {
1896 /* seems the client considers us as its best gateway.
1897 * send a claim and update the claim table
1898 * immediately.
1899 */
3b300de3
SE
1900 batadv_handle_claim(bat_priv, primary_if,
1901 primary_if->net_dev->dev_addr,
1902 ethhdr->h_source, vid);
23721387
SW
1903 goto allow;
1904 }
1905allow:
3b300de3 1906 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
4b426b10 1907 ret = false;
23721387
SW
1908 goto out;
1909
1910handled:
1911 kfree_skb(skb);
4b426b10 1912 ret = true;
23721387
SW
1913
1914out:
1915 if (primary_if)
82047ad7 1916 batadv_hardif_put(primary_if);
23721387 1917 if (claim)
321e3e08 1918 batadv_claim_put(claim);
23721387
SW
1919 return ret;
1920}
1921
2c53040f 1922/**
7e9a8c2c 1923 * batadv_bla_tx() - check packets going into the mesh
2c53040f 1924 * @bat_priv: the bat priv with all the soft interface information
23721387
SW
1925 * @skb: the frame to be checked
1926 * @vid: the VLAN ID of the frame
1927 *
04e14be6 1928 * batadv_bla_tx checks if:
23721387
SW
1929 * * a claim was received which has to be processed
1930 * * the frame is allowed on the mesh
1931 *
62fe710f 1932 * in these cases, the skb is further handled by this function.
9d2c9488
LL
1933 *
1934 * This call might reallocate skb data.
62fe710f 1935 *
4b426b10
SE
1936 * Return: true if handled, otherwise it returns false and the caller shall
1937 * further process the skb.
23721387 1938 */
4b426b10
SE
1939bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1940 unsigned short vid)
23721387
SW
1941{
1942 struct ethhdr *ethhdr;
712bbfe4 1943 struct batadv_bla_claim search_claim, *claim = NULL;
3db0decf 1944 struct batadv_bla_backbone_gw *backbone_gw;
56303d34 1945 struct batadv_hard_iface *primary_if;
3db0decf 1946 bool client_roamed;
4b426b10 1947 bool ret = false;
23721387 1948
e5d89254 1949 primary_if = batadv_primary_if_get_selected(bat_priv);
23721387
SW
1950 if (!primary_if)
1951 goto out;
1952
1953 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1954 goto allow;
1955
3b300de3 1956 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
23721387
SW
1957 goto handled;
1958
7ed4be95 1959 ethhdr = eth_hdr(skb);
23721387 1960
807736f6 1961 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
23721387
SW
1962 /* don't allow broadcasts while requests are in flight */
1963 if (is_multicast_ether_addr(ethhdr->h_dest))
1964 goto handled;
1965
8fdd0153 1966 ether_addr_copy(search_claim.addr, ethhdr->h_source);
23721387
SW
1967 search_claim.vid = vid;
1968
3b300de3 1969 claim = batadv_claim_hash_find(bat_priv, &search_claim);
23721387
SW
1970
1971 /* if no claim exists, allow it. */
1972 if (!claim)
1973 goto allow;
1974
1975 /* check if we are responsible. */
3db0decf
SE
1976 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1977 client_roamed = batadv_compare_eth(backbone_gw->orig,
1978 primary_if->net_dev->dev_addr);
1979 batadv_backbone_gw_put(backbone_gw);
1980
1981 if (client_roamed) {
23721387
SW
1982 /* if yes, the client has roamed and we have
1983 * to unclaim it.
1984 */
a3a5129e
AP
1985 if (batadv_has_timed_out(claim->lasttime, 100)) {
1986 /* only unclaim if the last claim entry is
1987 * older than 100 ms to make sure we really
1988 * have a roaming client here.
1989 */
22f0502e
SE
1990 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n",
1991 __func__, ethhdr->h_source);
a3a5129e
AP
1992 batadv_handle_unclaim(bat_priv, primary_if,
1993 primary_if->net_dev->dev_addr,
1994 ethhdr->h_source, vid);
1995 goto allow;
1996 } else {
22f0502e
SE
1997 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n",
1998 __func__, ethhdr->h_source);
a3a5129e
AP
1999 goto handled;
2000 }
23721387
SW
2001 }
2002
2003 /* check if it is a multicast/broadcast frame */
2004 if (is_multicast_ether_addr(ethhdr->h_dest)) {
2005 /* drop it. the responsible gateway has forwarded it into
2006 * the backbone network.
2007 */
2008 goto handled;
2009 } else {
2010 /* we must allow it. at least if we are
2011 * responsible for the DESTINATION.
2012 */
2013 goto allow;
2014 }
2015allow:
3b300de3 2016 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
4b426b10 2017 ret = false;
23721387
SW
2018 goto out;
2019handled:
4b426b10 2020 ret = true;
23721387
SW
2021out:
2022 if (primary_if)
82047ad7 2023 batadv_hardif_put(primary_if);
23721387 2024 if (claim)
321e3e08 2025 batadv_claim_put(claim);
23721387
SW
2026 return ret;
2027}
9bf8e4d4 2028
dc1cbd14 2029#ifdef CONFIG_BATMAN_ADV_DEBUGFS
04e14be6 2030/**
7e9a8c2c 2031 * batadv_bla_claim_table_seq_print_text() - print the claim table in a seq file
04e14be6
SW
2032 * @seq: seq file to print on
2033 * @offset: not used
2034 *
2035 * Return: always 0
2036 */
08adf151 2037int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
9bf8e4d4
SW
2038{
2039 struct net_device *net_dev = (struct net_device *)seq->private;
56303d34 2040 struct batadv_priv *bat_priv = netdev_priv(net_dev);
807736f6 2041 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
3db0decf 2042 struct batadv_bla_backbone_gw *backbone_gw;
712bbfe4 2043 struct batadv_bla_claim *claim;
56303d34 2044 struct batadv_hard_iface *primary_if;
9bf8e4d4 2045 struct hlist_head *head;
5a1dd8a4 2046 u16 backbone_crc;
6b5e971a 2047 u32 i;
9bf8e4d4 2048 bool is_own;
6b5e971a 2049 u8 *primary_addr;
9bf8e4d4 2050
30da63a6
ML
2051 primary_if = batadv_seq_print_text_primary_if_get(seq);
2052 if (!primary_if)
9bf8e4d4 2053 goto out;
9bf8e4d4 2054
1eda58bf 2055 primary_addr = primary_if->net_dev->dev_addr;
38ef3d1d 2056 seq_printf(seq,
39a32991 2057 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1eda58bf 2058 net_dev->name, primary_addr,
807736f6 2059 ntohs(bat_priv->bla.claim_dest.group));
925a6f37
AQ
2060 seq_puts(seq,
2061 " Client VID Originator [o] (CRC )\n");
9bf8e4d4
SW
2062 for (i = 0; i < hash->size; i++) {
2063 head = &hash->table[i];
2064
2065 rcu_read_lock();
b67bfe0d 2066 hlist_for_each_entry_rcu(claim, head, hash_entry) {
3db0decf
SE
2067 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
2068
2069 is_own = batadv_compare_eth(backbone_gw->orig,
1eda58bf 2070 primary_addr);
5a1dd8a4 2071
3db0decf
SE
2072 spin_lock_bh(&backbone_gw->crc_lock);
2073 backbone_crc = backbone_gw->crc;
2074 spin_unlock_bh(&backbone_gw->crc_lock);
eb2deb6b 2075 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
f7a2bd65 2076 claim->addr, batadv_print_vid(claim->vid),
3db0decf 2077 backbone_gw->orig,
9bf8e4d4 2078 (is_own ? 'x' : ' '),
5a1dd8a4 2079 backbone_crc);
3db0decf
SE
2080
2081 batadv_backbone_gw_put(backbone_gw);
9bf8e4d4
SW
2082 }
2083 rcu_read_unlock();
2084 }
2085out:
2086 if (primary_if)
82047ad7 2087 batadv_hardif_put(primary_if);
30da63a6 2088 return 0;
9bf8e4d4 2089}
dc1cbd14 2090#endif
536a23f1 2091
04f3f5bf 2092/**
7e9a8c2c 2093 * batadv_bla_claim_dump_entry() - dump one entry of the claim table
04f3f5bf
AL
2094 * to a netlink socket
2095 * @msg: buffer for the message
2096 * @portid: netlink port
24d71b92 2097 * @cb: Control block containing additional options
04f3f5bf
AL
2098 * @primary_if: primary interface
2099 * @claim: entry to dump
2100 *
2101 * Return: 0 or error code.
2102 */
2103static int
24d71b92
SE
2104batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid,
2105 struct netlink_callback *cb,
04f3f5bf
AL
2106 struct batadv_hard_iface *primary_if,
2107 struct batadv_bla_claim *claim)
2108{
2109 u8 *primary_addr = primary_if->net_dev->dev_addr;
2110 u16 backbone_crc;
2111 bool is_own;
2112 void *hdr;
2113 int ret = -EINVAL;
2114
24d71b92
SE
2115 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2116 &batadv_netlink_family, NLM_F_MULTI,
2117 BATADV_CMD_GET_BLA_CLAIM);
04f3f5bf
AL
2118 if (!hdr) {
2119 ret = -ENOBUFS;
2120 goto out;
2121 }
2122
24d71b92
SE
2123 genl_dump_check_consistent(cb, hdr);
2124
04f3f5bf
AL
2125 is_own = batadv_compare_eth(claim->backbone_gw->orig,
2126 primary_addr);
2127
2128 spin_lock_bh(&claim->backbone_gw->crc_lock);
2129 backbone_crc = claim->backbone_gw->crc;
2130 spin_unlock_bh(&claim->backbone_gw->crc_lock);
2131
2132 if (is_own)
2133 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2134 genlmsg_cancel(msg, hdr);
2135 goto out;
2136 }
2137
2138 if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
2139 nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
2140 nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2141 claim->backbone_gw->orig) ||
2142 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2143 backbone_crc)) {
2144 genlmsg_cancel(msg, hdr);
2145 goto out;
2146 }
2147
2148 genlmsg_end(msg, hdr);
2149 ret = 0;
2150
2151out:
2152 return ret;
2153}
2154
2155/**
7e9a8c2c 2156 * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table
04f3f5bf
AL
2157 * to a netlink socket
2158 * @msg: buffer for the message
2159 * @portid: netlink port
24d71b92 2160 * @cb: Control block containing additional options
04f3f5bf 2161 * @primary_if: primary interface
24d71b92
SE
2162 * @hash: hash to dump
2163 * @bucket: bucket index to dump
04f3f5bf
AL
2164 * @idx_skip: How many entries to skip
2165 *
2166 * Return: always 0.
2167 */
2168static int
24d71b92
SE
2169batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid,
2170 struct netlink_callback *cb,
04f3f5bf 2171 struct batadv_hard_iface *primary_if,
24d71b92
SE
2172 struct batadv_hashtable *hash, unsigned int bucket,
2173 int *idx_skip)
04f3f5bf
AL
2174{
2175 struct batadv_bla_claim *claim;
2176 int idx = 0;
b0264ecd 2177 int ret = 0;
04f3f5bf 2178
24d71b92
SE
2179 spin_lock_bh(&hash->list_locks[bucket]);
2180 cb->seq = atomic_read(&hash->generation) << 1 | 1;
2181
2182 hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) {
04f3f5bf
AL
2183 if (idx++ < *idx_skip)
2184 continue;
b0264ecd 2185
24d71b92 2186 ret = batadv_bla_claim_dump_entry(msg, portid, cb,
b0264ecd
SE
2187 primary_if, claim);
2188 if (ret) {
04f3f5bf
AL
2189 *idx_skip = idx - 1;
2190 goto unlock;
2191 }
2192 }
2193
b0264ecd 2194 *idx_skip = 0;
04f3f5bf 2195unlock:
24d71b92 2196 spin_unlock_bh(&hash->list_locks[bucket]);
b0264ecd 2197 return ret;
04f3f5bf
AL
2198}
2199
2200/**
7e9a8c2c 2201 * batadv_bla_claim_dump() - dump claim table to a netlink socket
04f3f5bf
AL
2202 * @msg: buffer for the message
2203 * @cb: callback structure containing arguments
2204 *
2205 * Return: message length.
2206 */
2207int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
2208{
2209 struct batadv_hard_iface *primary_if = NULL;
2210 int portid = NETLINK_CB(cb->skb).portid;
2211 struct net *net = sock_net(cb->skb->sk);
2212 struct net_device *soft_iface;
2213 struct batadv_hashtable *hash;
2214 struct batadv_priv *bat_priv;
2215 int bucket = cb->args[0];
04f3f5bf
AL
2216 int idx = cb->args[1];
2217 int ifindex;
2218 int ret = 0;
2219
2220 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2221 BATADV_ATTR_MESH_IFINDEX);
2222 if (!ifindex)
2223 return -EINVAL;
2224
2225 soft_iface = dev_get_by_index(net, ifindex);
2226 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2227 ret = -ENODEV;
2228 goto out;
2229 }
2230
2231 bat_priv = netdev_priv(soft_iface);
2232 hash = bat_priv->bla.claim_hash;
2233
2234 primary_if = batadv_primary_if_get_selected(bat_priv);
2235 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2236 ret = -ENOENT;
2237 goto out;
2238 }
2239
2240 while (bucket < hash->size) {
24d71b92
SE
2241 if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if,
2242 hash, bucket, &idx))
04f3f5bf
AL
2243 break;
2244 bucket++;
2245 }
2246
2247 cb->args[0] = bucket;
2248 cb->args[1] = idx;
2249
2250 ret = msg->len;
2251
2252out:
2253 if (primary_if)
2254 batadv_hardif_put(primary_if);
2255
2256 if (soft_iface)
2257 dev_put(soft_iface);
2258
2259 return ret;
2260}
2261
dc1cbd14 2262#ifdef CONFIG_BATMAN_ADV_DEBUGFS
04e14be6 2263/**
7e9a8c2c
SE
2264 * batadv_bla_backbone_table_seq_print_text() - print the backbone table in a
2265 * seq file
04e14be6
SW
2266 * @seq: seq file to print on
2267 * @offset: not used
2268 *
2269 * Return: always 0
2270 */
536a23f1
SW
2271int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
2272{
2273 struct net_device *net_dev = (struct net_device *)seq->private;
2274 struct batadv_priv *bat_priv = netdev_priv(net_dev);
807736f6 2275 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
bae98774 2276 struct batadv_bla_backbone_gw *backbone_gw;
536a23f1 2277 struct batadv_hard_iface *primary_if;
536a23f1
SW
2278 struct hlist_head *head;
2279 int secs, msecs;
5a1dd8a4 2280 u16 backbone_crc;
6b5e971a 2281 u32 i;
536a23f1 2282 bool is_own;
6b5e971a 2283 u8 *primary_addr;
536a23f1 2284
30da63a6
ML
2285 primary_if = batadv_seq_print_text_primary_if_get(seq);
2286 if (!primary_if)
536a23f1 2287 goto out;
536a23f1
SW
2288
2289 primary_addr = primary_if->net_dev->dev_addr;
2290 seq_printf(seq,
39a32991 2291 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
536a23f1 2292 net_dev->name, primary_addr,
807736f6 2293 ntohs(bat_priv->bla.claim_dest.group));
925a6f37 2294 seq_puts(seq, " Originator VID last seen (CRC )\n");
536a23f1
SW
2295 for (i = 0; i < hash->size; i++) {
2296 head = &hash->table[i];
2297
2298 rcu_read_lock();
b67bfe0d 2299 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
536a23f1
SW
2300 msecs = jiffies_to_msecs(jiffies -
2301 backbone_gw->lasttime);
2302 secs = msecs / 1000;
2303 msecs = msecs % 1000;
2304
2305 is_own = batadv_compare_eth(backbone_gw->orig,
2306 primary_addr);
2307 if (is_own)
2308 continue;
2309
5a1dd8a4
SW
2310 spin_lock_bh(&backbone_gw->crc_lock);
2311 backbone_crc = backbone_gw->crc;
2312 spin_unlock_bh(&backbone_gw->crc_lock);
2313
eb2deb6b 2314 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
5f80df67 2315 backbone_gw->orig,
f7a2bd65 2316 batadv_print_vid(backbone_gw->vid), secs,
5a1dd8a4 2317 msecs, backbone_crc);
536a23f1
SW
2318 }
2319 rcu_read_unlock();
2320 }
2321out:
2322 if (primary_if)
82047ad7 2323 batadv_hardif_put(primary_if);
30da63a6 2324 return 0;
536a23f1 2325}
dc1cbd14 2326#endif
ea4152e1
SW
2327
2328/**
7e9a8c2c
SE
2329 * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a
2330 * netlink socket
ea4152e1
SW
2331 * @msg: buffer for the message
2332 * @portid: netlink port
b00d0e6a 2333 * @cb: Control block containing additional options
ea4152e1
SW
2334 * @primary_if: primary interface
2335 * @backbone_gw: entry to dump
2336 *
2337 * Return: 0 or error code.
2338 */
2339static int
b00d0e6a
SE
2340batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid,
2341 struct netlink_callback *cb,
ea4152e1
SW
2342 struct batadv_hard_iface *primary_if,
2343 struct batadv_bla_backbone_gw *backbone_gw)
2344{
2345 u8 *primary_addr = primary_if->net_dev->dev_addr;
2346 u16 backbone_crc;
2347 bool is_own;
2348 int msecs;
2349 void *hdr;
2350 int ret = -EINVAL;
2351
b00d0e6a
SE
2352 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2353 &batadv_netlink_family, NLM_F_MULTI,
2354 BATADV_CMD_GET_BLA_BACKBONE);
ea4152e1
SW
2355 if (!hdr) {
2356 ret = -ENOBUFS;
2357 goto out;
2358 }
2359
b00d0e6a
SE
2360 genl_dump_check_consistent(cb, hdr);
2361
ea4152e1
SW
2362 is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
2363
2364 spin_lock_bh(&backbone_gw->crc_lock);
2365 backbone_crc = backbone_gw->crc;
2366 spin_unlock_bh(&backbone_gw->crc_lock);
2367
2368 msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
2369
2370 if (is_own)
2371 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2372 genlmsg_cancel(msg, hdr);
2373 goto out;
2374 }
2375
2376 if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2377 backbone_gw->orig) ||
2378 nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
2379 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2380 backbone_crc) ||
2381 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
2382 genlmsg_cancel(msg, hdr);
2383 goto out;
2384 }
2385
2386 genlmsg_end(msg, hdr);
2387 ret = 0;
2388
2389out:
2390 return ret;
2391}
2392
2393/**
7e9a8c2c
SE
2394 * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to
2395 * a netlink socket
ea4152e1
SW
2396 * @msg: buffer for the message
2397 * @portid: netlink port
b00d0e6a 2398 * @cb: Control block containing additional options
ea4152e1 2399 * @primary_if: primary interface
b00d0e6a
SE
2400 * @hash: hash to dump
2401 * @bucket: bucket index to dump
ea4152e1
SW
2402 * @idx_skip: How many entries to skip
2403 *
2404 * Return: always 0.
2405 */
2406static int
b00d0e6a
SE
2407batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid,
2408 struct netlink_callback *cb,
ea4152e1 2409 struct batadv_hard_iface *primary_if,
b00d0e6a
SE
2410 struct batadv_hashtable *hash,
2411 unsigned int bucket, int *idx_skip)
ea4152e1
SW
2412{
2413 struct batadv_bla_backbone_gw *backbone_gw;
2414 int idx = 0;
fce672db 2415 int ret = 0;
ea4152e1 2416
b00d0e6a
SE
2417 spin_lock_bh(&hash->list_locks[bucket]);
2418 cb->seq = atomic_read(&hash->generation) << 1 | 1;
2419
2420 hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) {
ea4152e1
SW
2421 if (idx++ < *idx_skip)
2422 continue;
fce672db 2423
b00d0e6a 2424 ret = batadv_bla_backbone_dump_entry(msg, portid, cb,
fce672db
SE
2425 primary_if, backbone_gw);
2426 if (ret) {
ea4152e1
SW
2427 *idx_skip = idx - 1;
2428 goto unlock;
2429 }
2430 }
2431
fce672db 2432 *idx_skip = 0;
ea4152e1 2433unlock:
b00d0e6a 2434 spin_unlock_bh(&hash->list_locks[bucket]);
fce672db 2435 return ret;
ea4152e1
SW
2436}
2437
2438/**
7e9a8c2c 2439 * batadv_bla_backbone_dump() - dump backbone table to a netlink socket
ea4152e1
SW
2440 * @msg: buffer for the message
2441 * @cb: callback structure containing arguments
2442 *
2443 * Return: message length.
2444 */
2445int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
2446{
2447 struct batadv_hard_iface *primary_if = NULL;
2448 int portid = NETLINK_CB(cb->skb).portid;
2449 struct net *net = sock_net(cb->skb->sk);
2450 struct net_device *soft_iface;
2451 struct batadv_hashtable *hash;
2452 struct batadv_priv *bat_priv;
2453 int bucket = cb->args[0];
ea4152e1
SW
2454 int idx = cb->args[1];
2455 int ifindex;
2456 int ret = 0;
2457
2458 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2459 BATADV_ATTR_MESH_IFINDEX);
2460 if (!ifindex)
2461 return -EINVAL;
2462
2463 soft_iface = dev_get_by_index(net, ifindex);
2464 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2465 ret = -ENODEV;
2466 goto out;
2467 }
2468
2469 bat_priv = netdev_priv(soft_iface);
2470 hash = bat_priv->bla.backbone_hash;
2471
2472 primary_if = batadv_primary_if_get_selected(bat_priv);
2473 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2474 ret = -ENOENT;
2475 goto out;
2476 }
2477
2478 while (bucket < hash->size) {
b00d0e6a
SE
2479 if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if,
2480 hash, bucket, &idx))
ea4152e1
SW
2481 break;
2482 bucket++;
2483 }
2484
2485 cb->args[0] = bucket;
2486 cb->args[1] = idx;
2487
2488 ret = msg->len;
2489
2490out:
2491 if (primary_if)
2492 batadv_hardif_put(primary_if);
2493
2494 if (soft_iface)
2495 dev_put(soft_iface);
2496
2497 return ret;
2498}
00311de5
AP
2499
2500#ifdef CONFIG_BATMAN_ADV_DAT
2501/**
7e9a8c2c 2502 * batadv_bla_check_claim() - check if address is claimed
00311de5
AP
2503 *
2504 * @bat_priv: the bat priv with all the soft interface information
2505 * @addr: mac address of which the claim status is checked
2506 * @vid: the VLAN ID
2507 *
2508 * addr is checked if this address is claimed by the local device itself.
2509 *
2510 * Return: true if bla is disabled or the mac is claimed by the device,
2511 * false if the device addr is already claimed by another gateway
2512 */
2513bool batadv_bla_check_claim(struct batadv_priv *bat_priv,
2514 u8 *addr, unsigned short vid)
2515{
2516 struct batadv_bla_claim search_claim;
2517 struct batadv_bla_claim *claim = NULL;
2518 struct batadv_hard_iface *primary_if = NULL;
2519 bool ret = true;
2520
2521 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
2522 return ret;
2523
2524 primary_if = batadv_primary_if_get_selected(bat_priv);
2525 if (!primary_if)
2526 return ret;
2527
2528 /* First look if the mac address is claimed */
2529 ether_addr_copy(search_claim.addr, addr);
2530 search_claim.vid = vid;
2531
2532 claim = batadv_claim_hash_find(bat_priv, &search_claim);
2533
2534 /* If there is a claim and we are not owner of the claim,
2535 * return false.
2536 */
2537 if (claim) {
2538 if (!batadv_compare_eth(claim->backbone_gw->orig,
2539 primary_if->net_dev->dev_addr))
2540 ret = false;
2541 batadv_claim_put(claim);
2542 }
2543
2544 batadv_hardif_put(primary_if);
2545 return ret;
2546}
2547#endif