blob: 191a70290dca2ae15af2ec31845c3b4ed8dad37c [file] [log] [blame]
Sven Eckelmann9f6446c2015-04-23 13:16:35 +02001/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors:
Simon Wunderlich23721382012-01-22 20:00:19 +01002 *
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
Antonio Quartulliebf38fb2013-11-03 20:40:48 +010015 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Simon Wunderlich23721382012-01-22 20:00:19 +010016 */
17
Simon Wunderlich23721382012-01-22 20:00:19 +010018#include "bridge_loop_avoidance.h"
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020019#include "main.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010020
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020021#include <linux/atomic.h>
22#include <linux/byteorder/generic.h>
23#include <linux/compiler.h>
Simon Wunderlich23721382012-01-22 20:00:19 +010024#include <linux/crc16.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020025#include <linux/errno.h>
26#include <linux/etherdevice.h>
27#include <linux/fs.h>
Simon Wunderlich23721382012-01-22 20:00:19 +010028#include <linux/if_arp.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020029#include <linux/if_ether.h>
Simon Wunderlich23721382012-01-22 20:00:19 +010030#include <linux/if_vlan.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020031#include <linux/jhash.h>
32#include <linux/jiffies.h>
33#include <linux/kernel.h>
34#include <linux/list.h>
35#include <linux/lockdep.h>
36#include <linux/netdevice.h>
37#include <linux/rculist.h>
38#include <linux/rcupdate.h>
39#include <linux/seq_file.h>
40#include <linux/skbuff.h>
41#include <linux/slab.h>
42#include <linux/spinlock.h>
43#include <linux/stddef.h>
44#include <linux/string.h>
45#include <linux/workqueue.h>
46#include <net/arp.h>
47
48#include "hard-interface.h"
49#include "hash.h"
50#include "originator.h"
51#include "packet.h"
52#include "translation-table.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010053
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020054static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
Simon Wunderlich23721382012-01-22 20:00:19 +010055
Sven Eckelmann3b300de2012-05-12 18:33:53 +020056static void batadv_bla_periodic_work(struct work_struct *work);
Marek Lindnerbae98772012-12-25 17:03:24 +080057static void
58batadv_bla_send_announce(struct batadv_priv *bat_priv,
59 struct batadv_bla_backbone_gw *backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +010060
61/* return the index of the claim */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020062static inline u32 batadv_choose_claim(const void *data, u32 size)
Simon Wunderlich23721382012-01-22 20:00:19 +010063{
Marek Lindner712bbfe42012-12-25 17:03:25 +080064 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020065 u32 hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010066
Sven Eckelmann36fd61c2015-03-01 09:46:18 +010067 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
68 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
Simon Wunderlich23721382012-01-22 20:00:19 +010069
70 return hash % size;
71}
72
73/* return the index of the backbone gateway */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020074static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
Simon Wunderlich23721382012-01-22 20:00:19 +010075{
Marek Lindner712bbfe42012-12-25 17:03:25 +080076 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020077 u32 hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010078
Sven Eckelmann36fd61c2015-03-01 09:46:18 +010079 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
80 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
Simon Wunderlich23721382012-01-22 20:00:19 +010081
82 return hash % size;
83}
84
Simon Wunderlich23721382012-01-22 20:00:19 +010085/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020086static int batadv_compare_backbone_gw(const struct hlist_node *node,
87 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010088{
Marek Lindnerbae98772012-12-25 17:03:24 +080089 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010090 hash_entry);
Sven Eckelmann4f248cf2015-06-09 20:50:49 +020091 const struct batadv_bla_backbone_gw *gw1 = data1;
92 const struct batadv_bla_backbone_gw *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010093
Simon Wunderlichc76d1522012-10-15 22:38:04 +020094 if (!batadv_compare_eth(gw1->orig, gw2->orig))
95 return 0;
96
97 if (gw1->vid != gw2->vid)
98 return 0;
99
100 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100101}
102
103/* compares address and vid of two claims */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200104static int batadv_compare_claim(const struct hlist_node *node,
105 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +0100106{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800107 const void *data1 = container_of(node, struct batadv_bla_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +0100108 hash_entry);
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200109 const struct batadv_bla_claim *cl1 = data1;
110 const struct batadv_bla_claim *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +0100111
Simon Wunderlichc76d1522012-10-15 22:38:04 +0200112 if (!batadv_compare_eth(cl1->addr, cl2->addr))
113 return 0;
114
115 if (cl1->vid != cl2->vid)
116 return 0;
117
118 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100119}
120
121/* free a backbone gw */
Marek Lindnerbae98772012-12-25 17:03:24 +0800122static void
123batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100124{
125 if (atomic_dec_and_test(&backbone_gw->refcount))
126 kfree_rcu(backbone_gw, rcu);
127}
128
129/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200130static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100131{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800132 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100133
Marek Lindner712bbfe42012-12-25 17:03:25 +0800134 claim = container_of(rcu, struct batadv_bla_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100135
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200136 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100137 kfree(claim);
138}
139
140/* free a claim, call claim_free_rcu if its the last reference */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800141static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100142{
143 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200144 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100145}
146
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100147/**
148 * batadv_claim_hash_find
149 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100150 * @data: search data (may be local/static data)
151 *
152 * looks for a claim in the hash, and returns it if found
153 * or NULL otherwise.
154 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800155static struct batadv_bla_claim
156*batadv_claim_hash_find(struct batadv_priv *bat_priv,
157 struct batadv_bla_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100158{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200159 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100160 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800161 struct batadv_bla_claim *claim;
162 struct batadv_bla_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100163 int index;
164
165 if (!hash)
166 return NULL;
167
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200168 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100169 head = &hash->table[index];
170
171 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800172 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200173 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100174 continue;
175
176 if (!atomic_inc_not_zero(&claim->refcount))
177 continue;
178
179 claim_tmp = claim;
180 break;
181 }
182 rcu_read_unlock();
183
184 return claim_tmp;
185}
186
Ben Hutchings2c530402012-07-10 10:55:09 +0000187/**
188 * batadv_backbone_hash_find - looks for a claim in the hash
189 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100190 * @addr: the address of the originator
191 * @vid: the VLAN ID
192 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000193 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100194 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800195static struct batadv_bla_backbone_gw *
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200196batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
197 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100198{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200199 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100200 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +0800201 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
202 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100203 int index;
204
205 if (!hash)
206 return NULL;
207
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100208 ether_addr_copy(search_entry.orig, addr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100209 search_entry.vid = vid;
210
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200211 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100212 head = &hash->table[index];
213
214 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800215 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200216 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
217 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100218 continue;
219
220 if (!atomic_inc_not_zero(&backbone_gw->refcount))
221 continue;
222
223 backbone_gw_tmp = backbone_gw;
224 break;
225 }
226 rcu_read_unlock();
227
228 return backbone_gw_tmp;
229}
230
231/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200232static void
Marek Lindnerbae98772012-12-25 17:03:24 +0800233batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100234{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200235 struct batadv_hashtable *hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800236 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100237 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800238 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100239 int i;
240 spinlock_t *list_lock; /* protects write access to the hash lists */
241
Sven Eckelmann807736f2012-07-15 22:26:51 +0200242 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100243 if (!hash)
244 return;
245
246 for (i = 0; i < hash->size; i++) {
247 head = &hash->table[i];
248 list_lock = &hash->list_locks[i];
249
250 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800251 hlist_for_each_entry_safe(claim, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100252 head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100253 if (claim->backbone_gw != backbone_gw)
254 continue;
255
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200256 batadv_claim_free_ref(claim);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800257 hlist_del_rcu(&claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100258 }
259 spin_unlock_bh(list_lock);
260 }
261
Antonio Quartulli3f687852014-11-02 11:29:56 +0100262 /* all claims gone, initialize CRC */
Sven Eckelmann3964f722012-06-03 22:19:10 +0200263 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100264}
265
Ben Hutchings2c530402012-07-10 10:55:09 +0000266/**
267 * batadv_bla_send_claim - sends a claim frame according to the provided info
268 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200269 * @mac: the mac address to be announced within the claim
Simon Wunderlich23721382012-01-22 20:00:19 +0100270 * @vid: the VLAN ID
271 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100272 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200273static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200274 unsigned short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100275{
276 struct sk_buff *skb;
277 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200278 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100279 struct net_device *soft_iface;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200280 u8 *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200281 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100282 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100283
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200284 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100285 if (!primary_if)
286 return;
287
Sven Eckelmann807736f2012-07-15 22:26:51 +0200288 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100289 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100290 local_claim_dest.type = claimtype;
291
292 soft_iface = primary_if->soft_iface;
293
294 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
295 /* IP DST: 0.0.0.0 */
296 zeroip,
297 primary_if->soft_iface,
298 /* IP SRC: 0.0.0.0 */
299 zeroip,
300 /* Ethernet DST: Broadcast */
301 NULL,
302 /* Ethernet SRC/HW SRC: originator mac */
303 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200304 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100305 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100306 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100307 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200308 (u8 *)&local_claim_dest);
Simon Wunderlich23721382012-01-22 20:00:19 +0100309
310 if (!skb)
311 goto out;
312
313 ethhdr = (struct ethhdr *)skb->data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200314 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100315
316 /* now we pretend that the client would have sent this ... */
317 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200318 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100319 /* normal claim frame
320 * set Ethernet SRC to the clients mac
321 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100322 ether_addr_copy(ethhdr->h_source, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200323 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200324 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
325 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100326 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200327 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100328 /* unclaim frame
329 * set HW SRC to the clients mac
330 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100331 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200332 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200333 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200334 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100335 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200336 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100337 /* announcement frame
338 * set HW SRC to the special mac containg the crc
339 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100340 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200341 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200342 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200343 ethhdr->h_source, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100344 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200345 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100346 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200347 * set HW SRC and header destination to the receiving backbone
348 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100349 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100350 ether_addr_copy(hw_src, mac);
351 ether_addr_copy(ethhdr->h_dest, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200352 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200353 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200354 ethhdr->h_source, ethhdr->h_dest,
355 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100356 break;
Simon Wunderlich23721382012-01-22 20:00:19 +0100357 }
358
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200359 if (vid & BATADV_VLAN_HAS_TAG)
360 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
361 vid & VLAN_VID_MASK);
Simon Wunderlich23721382012-01-22 20:00:19 +0100362
363 skb_reset_mac_header(skb);
364 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200365 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
366 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
367 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100368 soft_iface->last_rx = jiffies;
369
370 netif_rx(skb);
371out:
372 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200373 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100374}
375
Ben Hutchings2c530402012-07-10 10:55:09 +0000376/**
377 * batadv_bla_get_backbone_gw
378 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100379 * @orig: the mac address of the originator
380 * @vid: the VLAN ID
Martin Hundebølle3357182014-07-15 09:41:06 +0200381 * @own_backbone: set if the requested backbone is local
Simon Wunderlich23721382012-01-22 20:00:19 +0100382 *
383 * searches for the backbone gw or creates a new one if it could not
384 * be found.
385 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800386static struct batadv_bla_backbone_gw *
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200387batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200388 unsigned short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100389{
Marek Lindnerbae98772012-12-25 17:03:24 +0800390 struct batadv_bla_backbone_gw *entry;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200391 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100392 int hash_added;
393
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200394 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100395
396 if (entry)
397 return entry;
398
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200399 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200400 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200401 orig, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100402
403 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
404 if (!entry)
405 return NULL;
406
407 entry->vid = vid;
408 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200409 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100410 entry->bat_priv = bat_priv;
411 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200412 atomic_set(&entry->wait_periods, 0);
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100413 ether_addr_copy(entry->orig, orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100414
415 /* one for the hash, one for returning */
416 atomic_set(&entry->refcount, 2);
417
Sven Eckelmann807736f2012-07-15 22:26:51 +0200418 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200419 batadv_compare_backbone_gw,
420 batadv_choose_backbone_gw, entry,
421 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100422
423 if (unlikely(hash_added != 0)) {
424 /* hash failed, free the structure */
425 kfree(entry);
426 return NULL;
427 }
428
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200429 /* this is a gateway now, remove any TT entry on this VLAN */
Sven Eckelmannda641192012-05-12 13:48:56 +0200430 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100431 if (orig_node) {
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200432 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200433 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200434 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100435 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200436
Simon Wunderlichd807f272012-09-09 22:27:57 +0200437 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200438 batadv_bla_send_announce(bat_priv, entry);
439
Simon Wunderlichd807f272012-09-09 22:27:57 +0200440 /* this will be decreased in the worker thread */
441 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200442 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200443 atomic_inc(&bat_priv->bla.num_requests);
444 }
445
Simon Wunderlich23721382012-01-22 20:00:19 +0100446 return entry;
447}
448
449/* update or add the own backbone gw to make sure we announce
450 * where we receive other backbone gws
451 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200452static void
453batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
454 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200455 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100456{
Marek Lindnerbae98772012-12-25 17:03:24 +0800457 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100458
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200459 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
460 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200461 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100462 if (unlikely(!backbone_gw))
463 return;
464
465 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200466 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100467}
468
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100469/**
470 * batadv_bla_answer_request - answer a bla request by sending own claims
471 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200472 * @primary_if: interface where the request came on
Simon Wunderlich23721382012-01-22 20:00:19 +0100473 * @vid: the vid where the request came on
474 *
475 * Repeat all of our own claims, and finally send an ANNOUNCE frame
476 * to allow the requester another check if the CRC is correct now.
477 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200478static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
479 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200480 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100481{
Simon Wunderlich23721382012-01-22 20:00:19 +0100482 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200483 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800484 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800485 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100486 int i;
487
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200488 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200489 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100490
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200491 backbone_gw = batadv_backbone_hash_find(bat_priv,
492 primary_if->net_dev->dev_addr,
493 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100494 if (!backbone_gw)
495 return;
496
Sven Eckelmann807736f2012-07-15 22:26:51 +0200497 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100498 for (i = 0; i < hash->size; i++) {
499 head = &hash->table[i];
500
501 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800502 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100503 /* only own claims are interesting */
504 if (claim->backbone_gw != backbone_gw)
505 continue;
506
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200507 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200508 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100509 }
510 rcu_read_unlock();
511 }
512
513 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200514 batadv_bla_send_announce(bat_priv, backbone_gw);
515 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100516}
517
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100518/**
519 * batadv_bla_send_request - send a request to repeat claims
520 * @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100521 *
522 * When the crc is wrong, ask the backbone gateway for a full table update.
523 * After the request, it will repeat all of his own claims and finally
524 * send an announcement claim with which we can check again.
525 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800526static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100527{
528 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200529 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100530
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200531 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
532 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100533
534 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200535 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200536 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100537
538 /* no local broadcasts should be sent or received, for now. */
539 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200540 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100541 atomic_set(&backbone_gw->request_sent, 1);
542 }
543}
544
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100545/**
546 * batadv_bla_send_announce
547 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100548 * @backbone_gw: our backbone gateway which should be announced
549 *
550 * This function sends an announcement. It is called from multiple
551 * places.
552 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200553static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800554 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100555{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200556 u8 mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100557 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100558
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200559 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100560 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100561 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100562
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200563 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200564 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100565}
566
Ben Hutchings2c530402012-07-10 10:55:09 +0000567/**
568 * batadv_bla_add_claim - Adds a claim in the claim hash
569 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100570 * @mac: the mac address of the claim
571 * @vid: the VLAN ID of the frame
572 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100573 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200574static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200575 const u8 *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800576 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100577{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800578 struct batadv_bla_claim *claim;
579 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100580 int hash_added;
581
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100582 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100583 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200584 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100585
586 /* create a new claim entry if it does not exist yet. */
587 if (!claim) {
588 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
589 if (!claim)
590 return;
591
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100592 ether_addr_copy(claim->addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100593 claim->vid = vid;
594 claim->lasttime = jiffies;
595 claim->backbone_gw = backbone_gw;
596
597 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200598 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200599 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200600 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200601 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200602 batadv_compare_claim,
603 batadv_choose_claim, claim,
604 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100605
606 if (unlikely(hash_added != 0)) {
607 /* only local changes happened. */
608 kfree(claim);
609 return;
610 }
611 } else {
612 claim->lasttime = jiffies;
613 if (claim->backbone_gw == backbone_gw)
614 /* no need to register a new backbone */
615 goto claim_free_ref;
616
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200617 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200618 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200619 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100620
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200621 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200622 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100623 }
624 /* set (new) backbone gw */
625 atomic_inc(&backbone_gw->refcount);
626 claim->backbone_gw = backbone_gw;
627
628 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
629 backbone_gw->lasttime = jiffies;
630
631claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200632 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100633}
634
635/* Delete a claim from the claim hash which has the
636 * given mac address and vid.
637 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200638static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200639 const u8 *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100640{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800641 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100642
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100643 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100644 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200645 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100646 if (!claim)
647 return;
648
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200649 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200650 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100651
Sven Eckelmann807736f2012-07-15 22:26:51 +0200652 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200653 batadv_choose_claim, claim);
654 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100655
656 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
657
658 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200659 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100660}
661
662/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200663static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
664 u8 *backbone_addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100665{
Marek Lindnerbae98772012-12-25 17:03:24 +0800666 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200667 u16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100668
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200669 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100670 return 0;
671
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200672 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
673 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100674
675 if (unlikely(!backbone_gw))
676 return 1;
677
Simon Wunderlich23721382012-01-22 20:00:19 +0100678 /* handle as ANNOUNCE frame */
679 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100680 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100681
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200682 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100683 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200684 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100685
686 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200687 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100688 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200689 backbone_gw->orig,
690 BATADV_PRINT_VID(backbone_gw->vid),
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200691 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100692
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200693 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100694 } else {
695 /* if we have sent a request and the crc was OK,
696 * we can allow traffic again.
697 */
698 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200699 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100700 atomic_set(&backbone_gw->request_sent, 0);
701 }
702 }
703
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200704 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100705 return 1;
706}
707
708/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200709static int batadv_handle_request(struct batadv_priv *bat_priv,
710 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200711 u8 *backbone_addr, struct ethhdr *ethhdr,
712 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100713{
714 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200715 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100716 return 0;
717
718 /* sanity check, this should not happen on a normal switch,
719 * we ignore it in this case.
720 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200721 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100722 return 1;
723
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200724 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200725 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200726 BATADV_PRINT_VID(vid), ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100727
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200728 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100729 return 1;
730}
731
732/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200733static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
734 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200735 u8 *backbone_addr, u8 *claim_addr,
736 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100737{
Marek Lindnerbae98772012-12-25 17:03:24 +0800738 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100739
740 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200741 if (primary_if && batadv_compare_eth(backbone_addr,
742 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200743 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200744 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100745
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200746 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100747
748 if (!backbone_gw)
749 return 1;
750
751 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200752 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200753 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200754 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100755
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200756 batadv_bla_del_claim(bat_priv, claim_addr, vid);
757 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100758 return 1;
759}
760
761/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200762static int batadv_handle_claim(struct batadv_priv *bat_priv,
763 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200764 u8 *backbone_addr, u8 *claim_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200765 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100766{
Marek Lindnerbae98772012-12-25 17:03:24 +0800767 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100768
769 /* register the gateway if not yet available, and add the claim. */
770
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200771 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
772 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100773
774 if (unlikely(!backbone_gw))
775 return 1;
776
777 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200778 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200779 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200780 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200781 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100782
783 /* TODO: we could call something like tt_local_del() here. */
784
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200785 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100786 return 1;
787}
788
Ben Hutchings2c530402012-07-10 10:55:09 +0000789/**
790 * batadv_check_claim_group
791 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200792 * @primary_if: the primary interface of this batman interface
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100793 * @hw_src: the Hardware source in the ARP Header
794 * @hw_dst: the Hardware destination in the ARP Header
795 * @ethhdr: pointer to the Ethernet header of the claim frame
796 *
797 * checks if it is a claim packet and if its on the same group.
798 * This function also applies the group ID of the sender
799 * if it is in the same mesh.
800 *
801 * returns:
802 * 2 - if it is a claim packet and on the same group
803 * 1 - if is a claim packet from another group
804 * 0 - if it is not a claim packet
805 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200806static int batadv_check_claim_group(struct batadv_priv *bat_priv,
807 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200808 u8 *hw_src, u8 *hw_dst,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200809 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100810{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200811 u8 *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200812 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200813 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100814
Sven Eckelmann96412692012-06-05 22:31:30 +0200815 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200816 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100817
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100818 /* if announcement packet, use the source,
819 * otherwise assume it is in the hw_src
820 */
821 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200822 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100823 backbone_addr = hw_src;
824 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200825 case BATADV_CLAIM_TYPE_REQUEST:
826 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200827 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100828 backbone_addr = ethhdr->h_source;
829 break;
830 default:
831 return 0;
832 }
833
834 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200835 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100836 return 0;
837
838 /* if its already the same group, it is fine. */
839 if (bla_dst->group == bla_dst_own->group)
840 return 2;
841
842 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200843 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100844
845 /* dont accept claims from gateways which are not in
846 * the same mesh or group.
847 */
848 if (!orig_node)
849 return 1;
850
851 /* if our mesh friends mac is bigger, use it for ourselves. */
852 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200853 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100854 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200855 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100856 bla_dst_own->group = bla_dst->group;
857 }
858
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200859 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100860
861 return 2;
862}
863
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100864/**
865 * batadv_bla_process_claim
866 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200867 * @primary_if: the primary hard interface of this batman soft interface
Simon Wunderlich23721382012-01-22 20:00:19 +0100868 * @skb: the frame to be checked
869 *
870 * Check if this is a claim frame, and process it accordingly.
871 *
872 * returns 1 if it was a claim frame, otherwise return 0 to
873 * tell the callee that it can use the frame on its own.
874 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200875static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
876 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200877 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100878{
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200879 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200880 u8 *hw_src, *hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200881 struct vlan_hdr *vhdr, vhdr_buf;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200882 struct ethhdr *ethhdr;
883 struct arphdr *arphdr;
884 unsigned short vid;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200885 int vlan_depth = 0;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200886 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100887 int headlen;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100888 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100889
Antonio Quartullic018ad32013-06-04 12:11:39 +0200890 vid = batadv_get_vid(skb, 0);
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200891 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100892
Antonio Quartullic018ad32013-06-04 12:11:39 +0200893 proto = ethhdr->h_proto;
894 headlen = ETH_HLEN;
895 if (vid & BATADV_VLAN_HAS_TAG) {
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200896 /* Traverse the VLAN/Ethertypes.
897 *
898 * At this point it is known that the first protocol is a VLAN
899 * header, so start checking at the encapsulated protocol.
900 *
901 * The depth of the VLAN headers is recorded to drop BLA claim
902 * frames encapsulated into multiple VLAN headers (QinQ).
903 */
904 do {
905 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
906 &vhdr_buf);
907 if (!vhdr)
908 return 0;
909
910 proto = vhdr->h_vlan_encapsulated_proto;
911 headlen += VLAN_HLEN;
912 vlan_depth++;
913 } while (proto == htons(ETH_P_8021Q));
Simon Wunderlich23721382012-01-22 20:00:19 +0100914 }
915
Antonio Quartulli293e9332013-05-19 12:55:16 +0200916 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100917 return 0; /* not a claim frame */
918
919 /* this must be a ARP frame. check if it is a claim. */
920
921 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
922 return 0;
923
924 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200925 ethhdr = eth_hdr(skb);
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200926 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
Simon Wunderlich23721382012-01-22 20:00:19 +0100927
928 /* Check whether the ARP frame carries a valid
929 * IP information
930 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100931 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
932 return 0;
933 if (arphdr->ar_pro != htons(ETH_P_IP))
934 return 0;
935 if (arphdr->ar_hln != ETH_ALEN)
936 return 0;
937 if (arphdr->ar_pln != 4)
938 return 0;
939
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200940 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100941 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200942 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200943 bla_dst_own = &bat_priv->bla.claim_dest;
944
945 /* check if it is a claim frame in general */
946 if (memcmp(bla_dst->magic, bla_dst_own->magic,
947 sizeof(bla_dst->magic)) != 0)
948 return 0;
949
950 /* check if there is a claim frame encapsulated deeper in (QinQ) and
951 * drop that, as this is not supported by BLA but should also not be
952 * sent via the mesh.
953 */
954 if (vlan_depth > 1)
955 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100956
957 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200958 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
959 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100960 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200961 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200962 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200963 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
964 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100965
966 if (ret < 2)
967 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100968
969 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200970 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100971
972 /* check for the different types of claim frames ... */
973 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200974 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200975 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
976 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100977 return 1;
978 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200979 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200980 if (batadv_handle_unclaim(bat_priv, primary_if,
981 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100982 return 1;
983 break;
984
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200985 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200986 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
987 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100988 return 1;
989 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200990 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200991 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
992 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100993 return 1;
994 break;
995 }
996
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200997 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200998 "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",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200999 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +01001000 return 1;
1001}
1002
1003/* Check when we last heard from other nodes, and remove them in case of
1004 * a time out, or clean all backbone gws if now is set.
1005 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001006static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001007{
Marek Lindnerbae98772012-12-25 17:03:24 +08001008 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001009 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +01001010 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001011 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001012 spinlock_t *list_lock; /* protects write access to the hash lists */
1013 int i;
1014
Sven Eckelmann807736f2012-07-15 22:26:51 +02001015 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001016 if (!hash)
1017 return;
1018
1019 for (i = 0; i < hash->size; i++) {
1020 head = &hash->table[i];
1021 list_lock = &hash->list_locks[i];
1022
1023 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08001024 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +01001025 head, hash_entry) {
1026 if (now)
1027 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001028 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001029 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001030 continue;
1031
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001032 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001033 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1034 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +01001035
1036purge_now:
1037 /* don't wait for the pending request anymore */
1038 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +02001039 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +01001040
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001041 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001042
Sasha Levinb67bfe02013-02-27 17:06:00 -08001043 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001044 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001045 }
1046 spin_unlock_bh(list_lock);
1047 }
1048}
1049
Ben Hutchings2c530402012-07-10 10:55:09 +00001050/**
1051 * batadv_bla_purge_claims
1052 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001053 * @primary_if: the selected primary interface, may be NULL if now is set
1054 * @now: whether the whole hash shall be wiped now
1055 *
1056 * Check when we heard last time from our own claims, and remove them in case of
1057 * a time out, or clean all claims if now is set
1058 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001059static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1060 struct batadv_hard_iface *primary_if,
1061 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001062{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001063 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001064 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001065 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001066 int i;
1067
Sven Eckelmann807736f2012-07-15 22:26:51 +02001068 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001069 if (!hash)
1070 return;
1071
1072 for (i = 0; i < hash->size; i++) {
1073 head = &hash->table[i];
1074
1075 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001076 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001077 if (now)
1078 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001079 if (!batadv_compare_eth(claim->backbone_gw->orig,
1080 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001081 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001082 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001083 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001084 continue;
1085
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001086 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001087 "bla_purge_claims(): %pM, vid %d, time out\n",
1088 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001089
1090purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001091 batadv_handle_unclaim(bat_priv, primary_if,
1092 claim->backbone_gw->orig,
1093 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001094 }
1095 rcu_read_unlock();
1096 }
1097}
1098
Ben Hutchings2c530402012-07-10 10:55:09 +00001099/**
1100 * batadv_bla_update_orig_address
1101 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001102 * @primary_if: the new selected primary_if
1103 * @oldif: the old primary interface, may be NULL
1104 *
1105 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001106 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001107void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1108 struct batadv_hard_iface *primary_if,
1109 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001110{
Marek Lindnerbae98772012-12-25 17:03:24 +08001111 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001112 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001113 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001114 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001115 int i;
1116
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001117 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001118 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1119 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001120
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001121 /* purge everything when bridge loop avoidance is turned off */
1122 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1123 oldif = NULL;
1124
Simon Wunderlich23721382012-01-22 20:00:19 +01001125 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001126 batadv_bla_purge_claims(bat_priv, NULL, 1);
1127 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001128 return;
1129 }
1130
Sven Eckelmann807736f2012-07-15 22:26:51 +02001131 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001132 if (!hash)
1133 return;
1134
1135 for (i = 0; i < hash->size; i++) {
1136 head = &hash->table[i];
1137
1138 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001139 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001140 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001141 if (!batadv_compare_eth(backbone_gw->orig,
1142 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001143 continue;
1144
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001145 ether_addr_copy(backbone_gw->orig,
1146 primary_if->net_dev->dev_addr);
Simon Wunderlich23721382012-01-22 20:00:19 +01001147 /* send an announce frame so others will ask for our
1148 * claims and update their tables.
1149 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001150 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001151 }
1152 rcu_read_unlock();
1153 }
1154}
1155
Simon Wunderlich23721382012-01-22 20:00:19 +01001156/* periodic work to do:
1157 * * purge structures when they are too old
1158 * * send announcements
1159 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001160static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001161{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001162 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001163 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001164 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001165 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001166 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001167 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001168 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001169 int i;
1170
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001171 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001172 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1173 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001174 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001175 if (!primary_if)
1176 goto out;
1177
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001178 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1179 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001180
1181 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1182 goto out;
1183
Sven Eckelmann807736f2012-07-15 22:26:51 +02001184 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001185 if (!hash)
1186 goto out;
1187
1188 for (i = 0; i < hash->size; i++) {
1189 head = &hash->table[i];
1190
1191 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001192 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001193 if (!batadv_compare_eth(backbone_gw->orig,
1194 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001195 continue;
1196
1197 backbone_gw->lasttime = jiffies;
1198
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001199 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001200
1201 /* request_sent is only set after creation to avoid
1202 * problems when we are not yet known as backbone gw
1203 * in the backbone.
1204 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001205 * We can reset this now after we waited some periods
1206 * to give bridge forward delays and bla group forming
1207 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001208 */
1209
1210 if (atomic_read(&backbone_gw->request_sent) == 0)
1211 continue;
1212
Simon Wunderlich28709872012-09-13 18:18:46 +02001213 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1214 continue;
1215
Simon Wunderlichd807f272012-09-09 22:27:57 +02001216 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1217 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001218 }
1219 rcu_read_unlock();
1220 }
1221out:
1222 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001223 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001224
Antonio Quartulli72414442012-12-25 13:14:37 +01001225 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1226 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001227}
1228
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001229/* The hash for claim and backbone hash receive the same key because they
1230 * are getting initialized by hash_new with the same key. Reinitializing
1231 * them with to different keys to allow nested locking without generating
1232 * lockdep warnings
1233 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001234static struct lock_class_key batadv_claim_hash_lock_class_key;
1235static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001236
Simon Wunderlich23721382012-01-22 20:00:19 +01001237/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001238int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001239{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001240 int i;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001241 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001242 struct batadv_hard_iface *primary_if;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001243 u16 crc;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001244 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001245
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001246 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1247
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001248 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001249
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001250 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001251 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1252 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001253 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001254 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001255 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1256 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001257 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001258 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001259 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001260 }
1261
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001262 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001263 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001264 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001265 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1266 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001267
Sven Eckelmann807736f2012-07-15 22:26:51 +02001268 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001269 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001270
Sven Eckelmann807736f2012-07-15 22:26:51 +02001271 bat_priv->bla.claim_hash = batadv_hash_new(128);
1272 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001273
Sven Eckelmann807736f2012-07-15 22:26:51 +02001274 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001275 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001276
Sven Eckelmann807736f2012-07-15 22:26:51 +02001277 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001278 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001279 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001280 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001281
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001282 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001283
Antonio Quartulli72414442012-12-25 13:14:37 +01001284 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1285
1286 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1287 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001288 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001289}
1290
Ben Hutchings2c530402012-07-10 10:55:09 +00001291/**
1292 * batadv_bla_check_bcast_duplist
1293 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001294 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001295 *
1296 * check if it is on our broadcast list. Another gateway might
1297 * have sent the same packet because it is connected to the same backbone,
1298 * so we have to remove this duplicate.
1299 *
1300 * This is performed by checking the CRC, which will tell us
1301 * with a good chance that it is the same packet. If it is furthermore
1302 * sent by another host, drop it. We allow equal packets from
1303 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001304 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001305int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001306 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001307{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001308 int i, curr, ret = 0;
1309 __be32 crc;
1310 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001311 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001312
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001313 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001314
1315 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001316 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001317
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001318 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1319
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001320 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001321 curr = (bat_priv->bla.bcast_duplist_curr + i);
1322 curr %= BATADV_DUPLIST_SIZE;
1323 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001324
1325 /* we can stop searching if the entry is too old ;
1326 * later entries will be even older
1327 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001328 if (batadv_has_timed_out(entry->entrytime,
1329 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001330 break;
1331
1332 if (entry->crc != crc)
1333 continue;
1334
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001335 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001336 continue;
1337
1338 /* this entry seems to match: same crc, not too old,
1339 * and from another gw. therefore return 1 to forbid it.
1340 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001341 ret = 1;
1342 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001343 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001344 /* not found, add a new entry (overwrite the oldest entry)
Antonio Quartulli3f687852014-11-02 11:29:56 +01001345 * and allow it, its the first occurrence.
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001346 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001347 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001348 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001349 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001350 entry->crc = crc;
1351 entry->entrytime = jiffies;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001352 ether_addr_copy(entry->orig, bcast_packet->orig);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001353 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001354
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001355out:
1356 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1357
1358 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001359}
1360
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001361/**
1362 * batadv_bla_is_backbone_gw_orig
1363 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001364 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001365 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001366 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001367 * Check if the originator is a gateway for the VLAN identified by vid.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001368 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001369 * Returns true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001370 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001371bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001372 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001373{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001374 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001375 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001376 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001377 int i;
1378
1379 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001380 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001381
1382 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001383 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001384
1385 for (i = 0; i < hash->size; i++) {
1386 head = &hash->table[i];
1387
1388 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001389 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001390 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1391 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001392 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001393 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001394 }
1395 }
1396 rcu_read_unlock();
1397 }
1398
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001399 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001400}
1401
Ben Hutchings2c530402012-07-10 10:55:09 +00001402/**
1403 * batadv_bla_is_backbone_gw
1404 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001405 * @orig_node: the orig_node of the frame
1406 * @hdr_size: maximum length of the frame
1407 *
1408 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1409 * if the orig_node is also a gateway on the soft interface, otherwise it
1410 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001411 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001412int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001413 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001414{
Marek Lindnerbae98772012-12-25 17:03:24 +08001415 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001416 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001417
1418 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1419 return 0;
1420
1421 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001422 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001423 return 0;
1424
Antonio Quartullic018ad32013-06-04 12:11:39 +02001425 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001426
1427 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001428 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1429 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001430 if (!backbone_gw)
1431 return 0;
1432
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001433 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001434 return 1;
1435}
1436
1437/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001438void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001439{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001440 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001441
Sven Eckelmann807736f2012-07-15 22:26:51 +02001442 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001443 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001444
Sven Eckelmann807736f2012-07-15 22:26:51 +02001445 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001446 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001447 batadv_hash_destroy(bat_priv->bla.claim_hash);
1448 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001449 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001450 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001451 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001452 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1453 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001454 }
1455 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001456 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001457}
1458
Ben Hutchings2c530402012-07-10 10:55:09 +00001459/**
1460 * batadv_bla_rx
1461 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001462 * @skb: the frame to be checked
1463 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001464 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001465 *
1466 * bla_rx avoidance checks if:
1467 * * we have to race for a claim
1468 * * if the frame is allowed on the LAN
1469 *
1470 * in these cases, the skb is further handled by this function and
1471 * returns 1, otherwise it returns 0 and the caller shall further
1472 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001473 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001474int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1475 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001476{
1477 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001478 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001479 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001480 int ret;
1481
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001482 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001483
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001484 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001485 if (!primary_if)
1486 goto handled;
1487
1488 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1489 goto allow;
1490
Sven Eckelmann807736f2012-07-15 22:26:51 +02001491 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001492 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001493 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001494 goto handled;
1495
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001496 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001497 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001498 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001499
1500 if (!claim) {
1501 /* possible optimization: race for a claim */
1502 /* No claim exists yet, claim it for us!
1503 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001504 batadv_handle_claim(bat_priv, primary_if,
1505 primary_if->net_dev->dev_addr,
1506 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001507 goto allow;
1508 }
1509
1510 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001511 if (batadv_compare_eth(claim->backbone_gw->orig,
1512 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001513 /* ... allow it in any case */
1514 claim->lasttime = jiffies;
1515 goto allow;
1516 }
1517
1518 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001519 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1520 /* ... drop it. the responsible gateway is in charge.
1521 *
1522 * We need to check is_bcast because with the gateway
1523 * feature, broadcasts (like DHCP requests) may be sent
1524 * using a unicast packet type.
1525 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001526 goto handled;
1527 } else {
1528 /* seems the client considers us as its best gateway.
1529 * send a claim and update the claim table
1530 * immediately.
1531 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001532 batadv_handle_claim(bat_priv, primary_if,
1533 primary_if->net_dev->dev_addr,
1534 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001535 goto allow;
1536 }
1537allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001538 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001539 ret = 0;
1540 goto out;
1541
1542handled:
1543 kfree_skb(skb);
1544 ret = 1;
1545
1546out:
1547 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001548 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001549 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001550 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001551 return ret;
1552}
1553
Ben Hutchings2c530402012-07-10 10:55:09 +00001554/**
1555 * batadv_bla_tx
1556 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001557 * @skb: the frame to be checked
1558 * @vid: the VLAN ID of the frame
1559 *
1560 * bla_tx checks if:
1561 * * a claim was received which has to be processed
1562 * * the frame is allowed on the mesh
1563 *
1564 * in these cases, the skb is further handled by this function and
1565 * returns 1, otherwise it returns 0 and the caller shall further
1566 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001567 *
1568 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001569 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001570int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1571 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001572{
1573 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001574 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001575 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001576 int ret = 0;
1577
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001578 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001579 if (!primary_if)
1580 goto out;
1581
1582 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1583 goto allow;
1584
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001585 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001586 goto handled;
1587
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001588 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001589
Sven Eckelmann807736f2012-07-15 22:26:51 +02001590 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001591 /* don't allow broadcasts while requests are in flight */
1592 if (is_multicast_ether_addr(ethhdr->h_dest))
1593 goto handled;
1594
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001595 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001596 search_claim.vid = vid;
1597
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001598 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001599
1600 /* if no claim exists, allow it. */
1601 if (!claim)
1602 goto allow;
1603
1604 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001605 if (batadv_compare_eth(claim->backbone_gw->orig,
1606 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001607 /* if yes, the client has roamed and we have
1608 * to unclaim it.
1609 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001610 batadv_handle_unclaim(bat_priv, primary_if,
1611 primary_if->net_dev->dev_addr,
1612 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001613 goto allow;
1614 }
1615
1616 /* check if it is a multicast/broadcast frame */
1617 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1618 /* drop it. the responsible gateway has forwarded it into
1619 * the backbone network.
1620 */
1621 goto handled;
1622 } else {
1623 /* we must allow it. at least if we are
1624 * responsible for the DESTINATION.
1625 */
1626 goto allow;
1627 }
1628allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001629 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001630 ret = 0;
1631 goto out;
1632handled:
1633 ret = 1;
1634out:
1635 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001636 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001637 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001638 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001639 return ret;
1640}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001641
Sven Eckelmann08adf152012-05-12 13:38:47 +02001642int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001643{
1644 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001645 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001646 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001647 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001648 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001649 struct hlist_head *head;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001650 u32 i;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001651 bool is_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001652 u8 *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001653
Marek Lindner30da63a2012-08-03 17:15:46 +02001654 primary_if = batadv_seq_print_text_primary_if_get(seq);
1655 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001656 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001657
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001658 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001659 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001660 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001661 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001662 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001663 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001664 "Client", "VID", "Originator", "CRC");
1665 for (i = 0; i < hash->size; i++) {
1666 head = &hash->table[i];
1667
1668 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001669 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001670 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1671 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001672 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001673 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001674 claim->backbone_gw->orig,
1675 (is_own ? 'x' : ' '),
1676 claim->backbone_gw->crc);
1677 }
1678 rcu_read_unlock();
1679 }
1680out:
1681 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001682 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001683 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001684}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001685
1686int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1687{
1688 struct net_device *net_dev = (struct net_device *)seq->private;
1689 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001690 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001691 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001692 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001693 struct hlist_head *head;
1694 int secs, msecs;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001695 u32 i;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001696 bool is_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001697 u8 *primary_addr;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001698
Marek Lindner30da63a2012-08-03 17:15:46 +02001699 primary_if = batadv_seq_print_text_primary_if_get(seq);
1700 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001701 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001702
1703 primary_addr = primary_if->net_dev->dev_addr;
1704 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001705 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001706 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001707 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001708 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001709 "Originator", "VID", "last seen", "CRC");
1710 for (i = 0; i < hash->size; i++) {
1711 head = &hash->table[i];
1712
1713 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001714 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001715 msecs = jiffies_to_msecs(jiffies -
1716 backbone_gw->lasttime);
1717 secs = msecs / 1000;
1718 msecs = msecs % 1000;
1719
1720 is_own = batadv_compare_eth(backbone_gw->orig,
1721 primary_addr);
1722 if (is_own)
1723 continue;
1724
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001725 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001726 backbone_gw->orig,
1727 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001728 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001729 }
1730 rcu_read_unlock();
1731 }
1732out:
1733 if (primary_if)
1734 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001735 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001736}