blob: 49008d98a8aad418ad25a9e09c50799a4bb4b302 [file] [log] [blame]
Sven Eckelmann0046b042016-01-01 00:01:03 +01001/* Copyright (C) 2011-2016 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>
Sven Eckelmann06e56de2016-01-16 10:29:43 +010034#include <linux/kref.h>
Sven Eckelmann1e2c2a42015-04-17 19:40:28 +020035#include <linux/list.h>
36#include <linux/lockdep.h>
37#include <linux/netdevice.h>
38#include <linux/rculist.h>
39#include <linux/rcupdate.h>
40#include <linux/seq_file.h>
41#include <linux/skbuff.h>
42#include <linux/slab.h>
43#include <linux/spinlock.h>
44#include <linux/stddef.h>
45#include <linux/string.h>
46#include <linux/workqueue.h>
47#include <net/arp.h>
48
49#include "hard-interface.h"
50#include "hash.h"
51#include "originator.h"
52#include "packet.h"
53#include "translation-table.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010054
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020055static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
Simon Wunderlich23721382012-01-22 20:00:19 +010056
Sven Eckelmann3b300de2012-05-12 18:33:53 +020057static void batadv_bla_periodic_work(struct work_struct *work);
Marek Lindnerbae98772012-12-25 17:03:24 +080058static void
59batadv_bla_send_announce(struct batadv_priv *bat_priv,
60 struct batadv_bla_backbone_gw *backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +010061
Sven Eckelmann62fe7102015-09-15 19:00:48 +020062/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +010063 * batadv_choose_claim - choose the right bucket for a claim.
64 * @data: data to hash
65 * @size: size of the hash table
Sven Eckelmann62fe7102015-09-15 19:00:48 +020066 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +010067 * Return: the hash index of the claim
Sven Eckelmann62fe7102015-09-15 19:00:48 +020068 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020069static inline u32 batadv_choose_claim(const void *data, u32 size)
Simon Wunderlich23721382012-01-22 20:00:19 +010070{
Marek Lindner712bbfe42012-12-25 17:03:25 +080071 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020072 u32 hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010073
Sven Eckelmann36fd61c2015-03-01 09:46:18 +010074 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
75 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
Simon Wunderlich23721382012-01-22 20:00:19 +010076
77 return hash % size;
78}
79
Sven Eckelmann62fe7102015-09-15 19:00:48 +020080/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +010081 * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway.
82 * @data: data to hash
83 * @size: size of the hash table
Sven Eckelmann62fe7102015-09-15 19:00:48 +020084 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +010085 * Return: the hash index of the backbone gateway
Sven Eckelmann62fe7102015-09-15 19:00:48 +020086 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020087static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
Simon Wunderlich23721382012-01-22 20:00:19 +010088{
Marek Lindner712bbfe42012-12-25 17:03:25 +080089 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +020090 u32 hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010091
Sven Eckelmann36fd61c2015-03-01 09:46:18 +010092 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
93 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
Simon Wunderlich23721382012-01-22 20:00:19 +010094
95 return hash % size;
96}
97
Simon Wunderlich04e14be2015-11-06 10:45:19 +010098/**
99 * batadv_compare_backbone_gw - compare address and vid of two backbone gws
100 * @node: list node of the first entry to compare
101 * @data2: pointer to the second backbone gateway
102 *
103 * Return: 1 if the backbones have the same data, 0 otherwise
104 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200105static int batadv_compare_backbone_gw(const struct hlist_node *node,
106 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +0100107{
Marek Lindnerbae98772012-12-25 17:03:24 +0800108 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +0100109 hash_entry);
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200110 const struct batadv_bla_backbone_gw *gw1 = data1;
111 const struct batadv_bla_backbone_gw *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +0100112
Simon Wunderlichc76d1522012-10-15 22:38:04 +0200113 if (!batadv_compare_eth(gw1->orig, gw2->orig))
114 return 0;
115
116 if (gw1->vid != gw2->vid)
117 return 0;
118
119 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100120}
121
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100122/**
123 * batadv_compare_backbone_gw - compare address and vid of two claims
124 * @node: list node of the first entry to compare
125 * @data2: pointer to the second claims
126 *
127 * Return: 1 if the claim have the same data, 0 otherwise
128 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200129static int batadv_compare_claim(const struct hlist_node *node,
130 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +0100131{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800132 const void *data1 = container_of(node, struct batadv_bla_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +0100133 hash_entry);
Sven Eckelmann4f248cf2015-06-09 20:50:49 +0200134 const struct batadv_bla_claim *cl1 = data1;
135 const struct batadv_bla_claim *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +0100136
Simon Wunderlichc76d1522012-10-15 22:38:04 +0200137 if (!batadv_compare_eth(cl1->addr, cl2->addr))
138 return 0;
139
140 if (cl1->vid != cl2->vid)
141 return 0;
142
143 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100144}
145
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100146/**
Sven Eckelmann06e56de2016-01-16 10:29:43 +0100147 * batadv_backbone_gw_release - release backbone gw from lists and queue for
148 * free after rcu grace period
149 * @ref: kref pointer of the backbone gw
150 */
151static void batadv_backbone_gw_release(struct kref *ref)
152{
153 struct batadv_bla_backbone_gw *backbone_gw;
154
155 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
156 refcount);
157
158 kfree_rcu(backbone_gw, rcu);
159}
160
161/**
162 * batadv_backbone_gw_free_ref - decrement the backbone gw refcounter and
163 * possibly release it
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100164 * @backbone_gw: backbone gateway to be free'd
165 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800166static void
167batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100168{
Sven Eckelmann06e56de2016-01-16 10:29:43 +0100169 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
Simon Wunderlich23721382012-01-22 20:00:19 +0100170}
171
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100172/**
173 * batadv_claim_release - release claim from lists and queue for free after rcu
174 * grace period
175 * @ref: kref pointer of the claim
176 */
Sven Eckelmann71b7e3d2016-01-16 10:29:44 +0100177static void batadv_claim_release(struct kref *ref)
Simon Wunderlich23721382012-01-22 20:00:19 +0100178{
Sven Eckelmann71b7e3d2016-01-16 10:29:44 +0100179 struct batadv_bla_claim *claim;
180
181 claim = container_of(ref, struct batadv_bla_claim, refcount);
182
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200183 batadv_backbone_gw_free_ref(claim->backbone_gw);
Sven Eckelmann63b39922016-01-14 15:28:19 +0100184 kfree_rcu(claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100185}
186
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100187/**
Sven Eckelmannec9b83c2016-01-05 12:06:16 +0100188 * batadv_claim_free_ref - decrement the claim refcounter and possibly
189 * release it
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100190 * @claim: claim to be free'd
191 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800192static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100193{
Sven Eckelmann71b7e3d2016-01-16 10:29:44 +0100194 kref_put(&claim->refcount, batadv_claim_release);
Simon Wunderlich23721382012-01-22 20:00:19 +0100195}
196
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100197/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100198 * batadv_claim_hash_find - looks for a claim in the claim hash
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100199 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100200 * @data: search data (may be local/static data)
201 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200202 * Return: claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100203 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800204static struct batadv_bla_claim
205*batadv_claim_hash_find(struct batadv_priv *bat_priv,
206 struct batadv_bla_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100207{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200208 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100209 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800210 struct batadv_bla_claim *claim;
211 struct batadv_bla_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100212 int index;
213
214 if (!hash)
215 return NULL;
216
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200217 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100218 head = &hash->table[index];
219
220 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800221 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200222 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100223 continue;
224
Sven Eckelmann71b7e3d2016-01-16 10:29:44 +0100225 if (!kref_get_unless_zero(&claim->refcount))
Simon Wunderlich23721382012-01-22 20:00:19 +0100226 continue;
227
228 claim_tmp = claim;
229 break;
230 }
231 rcu_read_unlock();
232
233 return claim_tmp;
234}
235
Ben Hutchings2c530402012-07-10 10:55:09 +0000236/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100237 * batadv_backbone_hash_find - looks for a backbone gateway in the hash
Ben Hutchings2c530402012-07-10 10:55:09 +0000238 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100239 * @addr: the address of the originator
240 * @vid: the VLAN ID
241 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100242 * Return: backbone gateway if found or NULL otherwise
Simon Wunderlich23721382012-01-22 20:00:19 +0100243 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800244static struct batadv_bla_backbone_gw *
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200245batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
246 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100247{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200248 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100249 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +0800250 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
251 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100252 int index;
253
254 if (!hash)
255 return NULL;
256
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100257 ether_addr_copy(search_entry.orig, addr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100258 search_entry.vid = vid;
259
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200260 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100261 head = &hash->table[index];
262
263 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800264 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200265 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
266 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100267 continue;
268
Sven Eckelmann06e56de2016-01-16 10:29:43 +0100269 if (!kref_get_unless_zero(&backbone_gw->refcount))
Simon Wunderlich23721382012-01-22 20:00:19 +0100270 continue;
271
272 backbone_gw_tmp = backbone_gw;
273 break;
274 }
275 rcu_read_unlock();
276
277 return backbone_gw_tmp;
278}
279
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100280/**
281 * batadv_bla_del_backbone_claims - delete all claims for a backbone
282 * @backbone_gw: backbone gateway where the claims should be removed
283 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200284static void
Marek Lindnerbae98772012-12-25 17:03:24 +0800285batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100286{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200287 struct batadv_hashtable *hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800288 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100289 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800290 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100291 int i;
292 spinlock_t *list_lock; /* protects write access to the hash lists */
293
Sven Eckelmann807736f2012-07-15 22:26:51 +0200294 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100295 if (!hash)
296 return;
297
298 for (i = 0; i < hash->size; i++) {
299 head = &hash->table[i];
300 list_lock = &hash->list_locks[i];
301
302 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800303 hlist_for_each_entry_safe(claim, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100304 head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100305 if (claim->backbone_gw != backbone_gw)
306 continue;
307
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200308 batadv_claim_free_ref(claim);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800309 hlist_del_rcu(&claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100310 }
311 spin_unlock_bh(list_lock);
312 }
313
Antonio Quartulli3f687852014-11-02 11:29:56 +0100314 /* all claims gone, initialize CRC */
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200315 spin_lock_bh(&backbone_gw->crc_lock);
Sven Eckelmann3964f722012-06-03 22:19:10 +0200316 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200317 spin_unlock_bh(&backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100318}
319
Ben Hutchings2c530402012-07-10 10:55:09 +0000320/**
321 * batadv_bla_send_claim - sends a claim frame according to the provided info
322 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200323 * @mac: the mac address to be announced within the claim
Simon Wunderlich23721382012-01-22 20:00:19 +0100324 * @vid: the VLAN ID
325 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100326 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200327static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200328 unsigned short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100329{
330 struct sk_buff *skb;
331 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200332 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100333 struct net_device *soft_iface;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200334 u8 *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200335 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100336 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100337
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200338 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100339 if (!primary_if)
340 return;
341
Sven Eckelmann807736f2012-07-15 22:26:51 +0200342 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100343 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100344 local_claim_dest.type = claimtype;
345
346 soft_iface = primary_if->soft_iface;
347
348 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
349 /* IP DST: 0.0.0.0 */
350 zeroip,
351 primary_if->soft_iface,
352 /* IP SRC: 0.0.0.0 */
353 zeroip,
354 /* Ethernet DST: Broadcast */
355 NULL,
356 /* Ethernet SRC/HW SRC: originator mac */
357 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200358 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100359 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100360 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100361 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200362 (u8 *)&local_claim_dest);
Simon Wunderlich23721382012-01-22 20:00:19 +0100363
364 if (!skb)
365 goto out;
366
367 ethhdr = (struct ethhdr *)skb->data;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200368 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100369
370 /* now we pretend that the client would have sent this ... */
371 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200372 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100373 /* normal claim frame
374 * set Ethernet SRC to the clients mac
375 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100376 ether_addr_copy(ethhdr->h_source, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200377 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200378 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
379 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100380 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200381 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100382 /* unclaim frame
383 * set HW SRC to the clients mac
384 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100385 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200386 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200387 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200388 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100389 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200390 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100391 /* announcement frame
392 * set HW SRC to the special mac containg the crc
393 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100394 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200395 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200396 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200397 ethhdr->h_source, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100398 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200399 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100400 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200401 * set HW SRC and header destination to the receiving backbone
402 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100403 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100404 ether_addr_copy(hw_src, mac);
405 ether_addr_copy(ethhdr->h_dest, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200406 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200407 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200408 ethhdr->h_source, ethhdr->h_dest,
409 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100410 break;
Simon Wunderlich23721382012-01-22 20:00:19 +0100411 }
412
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200413 if (vid & BATADV_VLAN_HAS_TAG)
414 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
415 vid & VLAN_VID_MASK);
Simon Wunderlich23721382012-01-22 20:00:19 +0100416
417 skb_reset_mac_header(skb);
418 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200419 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
420 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
421 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100422 soft_iface->last_rx = jiffies;
423
424 netif_rx(skb);
425out:
426 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200427 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100428}
429
Ben Hutchings2c530402012-07-10 10:55:09 +0000430/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100431 * batadv_bla_get_backbone_gw - finds or creates a backbone gateway
Ben Hutchings2c530402012-07-10 10:55:09 +0000432 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100433 * @orig: the mac address of the originator
434 * @vid: the VLAN ID
Martin Hundebølle3357182014-07-15 09:41:06 +0200435 * @own_backbone: set if the requested backbone is local
Simon Wunderlich23721382012-01-22 20:00:19 +0100436 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100437 * Return: the (possibly created) backbone gateway or NULL on error
Simon Wunderlich23721382012-01-22 20:00:19 +0100438 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800439static struct batadv_bla_backbone_gw *
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200440batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200441 unsigned short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100442{
Marek Lindnerbae98772012-12-25 17:03:24 +0800443 struct batadv_bla_backbone_gw *entry;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200444 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100445 int hash_added;
446
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200447 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100448
449 if (entry)
450 return entry;
451
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200452 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200453 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200454 orig, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100455
456 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
457 if (!entry)
458 return NULL;
459
460 entry->vid = vid;
461 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200462 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100463 entry->bat_priv = bat_priv;
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200464 spin_lock_init(&entry->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100465 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200466 atomic_set(&entry->wait_periods, 0);
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100467 ether_addr_copy(entry->orig, orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100468
469 /* one for the hash, one for returning */
Sven Eckelmann06e56de2016-01-16 10:29:43 +0100470 kref_init(&entry->refcount);
471 kref_get(&entry->refcount);
Simon Wunderlich23721382012-01-22 20:00:19 +0100472
Sven Eckelmann807736f2012-07-15 22:26:51 +0200473 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200474 batadv_compare_backbone_gw,
475 batadv_choose_backbone_gw, entry,
476 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100477
478 if (unlikely(hash_added != 0)) {
479 /* hash failed, free the structure */
480 kfree(entry);
481 return NULL;
482 }
483
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200484 /* this is a gateway now, remove any TT entry on this VLAN */
Sven Eckelmannda641192012-05-12 13:48:56 +0200485 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100486 if (orig_node) {
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200487 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200488 "became a backbone gateway");
Sven Eckelmann5d967312016-01-17 11:01:09 +0100489 batadv_orig_node_put(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100490 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200491
Simon Wunderlichd807f272012-09-09 22:27:57 +0200492 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200493 batadv_bla_send_announce(bat_priv, entry);
494
Simon Wunderlichd807f272012-09-09 22:27:57 +0200495 /* this will be decreased in the worker thread */
496 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200497 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200498 atomic_inc(&bat_priv->bla.num_requests);
499 }
500
Simon Wunderlich23721382012-01-22 20:00:19 +0100501 return entry;
502}
503
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100504/**
505 * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN
506 * @bat_priv: the bat priv with all the soft interface information
507 * @primary_if: the selected primary interface
508 * @vid: VLAN identifier
509 *
510 * update or add the own backbone gw to make sure we announce
Simon Wunderlich23721382012-01-22 20:00:19 +0100511 * where we receive other backbone gws
512 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200513static void
514batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
515 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200516 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100517{
Marek Lindnerbae98772012-12-25 17:03:24 +0800518 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100519
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200520 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
521 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200522 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100523 if (unlikely(!backbone_gw))
524 return;
525
526 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200527 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100528}
529
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100530/**
531 * batadv_bla_answer_request - answer a bla request by sending own claims
532 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200533 * @primary_if: interface where the request came on
Simon Wunderlich23721382012-01-22 20:00:19 +0100534 * @vid: the vid where the request came on
535 *
536 * Repeat all of our own claims, and finally send an ANNOUNCE frame
537 * to allow the requester another check if the CRC is correct now.
538 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200539static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
540 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200541 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100542{
Simon Wunderlich23721382012-01-22 20:00:19 +0100543 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200544 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800545 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800546 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100547 int i;
548
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200549 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200550 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100551
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200552 backbone_gw = batadv_backbone_hash_find(bat_priv,
553 primary_if->net_dev->dev_addr,
554 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100555 if (!backbone_gw)
556 return;
557
Sven Eckelmann807736f2012-07-15 22:26:51 +0200558 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100559 for (i = 0; i < hash->size; i++) {
560 head = &hash->table[i];
561
562 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800563 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100564 /* only own claims are interesting */
565 if (claim->backbone_gw != backbone_gw)
566 continue;
567
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200568 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200569 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100570 }
571 rcu_read_unlock();
572 }
573
574 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200575 batadv_bla_send_announce(bat_priv, backbone_gw);
576 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100577}
578
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100579/**
580 * batadv_bla_send_request - send a request to repeat claims
581 * @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100582 *
583 * When the crc is wrong, ask the backbone gateway for a full table update.
584 * After the request, it will repeat all of his own claims and finally
585 * send an announcement claim with which we can check again.
586 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800587static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100588{
589 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200590 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100591
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200592 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
593 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100594
595 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200596 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200597 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100598
599 /* no local broadcasts should be sent or received, for now. */
600 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200601 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100602 atomic_set(&backbone_gw->request_sent, 1);
603 }
604}
605
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100606/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100607 * batadv_bla_send_announce - Send an announcement frame
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100608 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100609 * @backbone_gw: our backbone gateway which should be announced
Simon Wunderlich23721382012-01-22 20:00:19 +0100610 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200611static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800612 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100613{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200614 u8 mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100615 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100616
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200617 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200618 spin_lock_bh(&backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100619 crc = htons(backbone_gw->crc);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200620 spin_unlock_bh(&backbone_gw->crc_lock);
Al Viro1a5852d2012-04-22 07:50:29 +0100621 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100622
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200623 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200624 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100625}
626
Ben Hutchings2c530402012-07-10 10:55:09 +0000627/**
628 * batadv_bla_add_claim - Adds a claim in the claim hash
629 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100630 * @mac: the mac address of the claim
631 * @vid: the VLAN ID of the frame
632 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100633 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200634static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200635 const u8 *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800636 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100637{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800638 struct batadv_bla_claim *claim;
639 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100640 int hash_added;
641
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100642 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100643 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200644 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100645
646 /* create a new claim entry if it does not exist yet. */
647 if (!claim) {
648 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
649 if (!claim)
650 return;
651
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100652 ether_addr_copy(claim->addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100653 claim->vid = vid;
654 claim->lasttime = jiffies;
655 claim->backbone_gw = backbone_gw;
656
Sven Eckelmann71b7e3d2016-01-16 10:29:44 +0100657 kref_init(&claim->refcount);
658 kref_get(&claim->refcount);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200659 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200660 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200661 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200662 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200663 batadv_compare_claim,
664 batadv_choose_claim, claim,
665 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100666
667 if (unlikely(hash_added != 0)) {
668 /* only local changes happened. */
669 kfree(claim);
670 return;
671 }
672 } else {
673 claim->lasttime = jiffies;
674 if (claim->backbone_gw == backbone_gw)
675 /* no need to register a new backbone */
676 goto claim_free_ref;
677
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200678 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200679 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200680 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100681
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200682 spin_lock_bh(&claim->backbone_gw->crc_lock);
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200683 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200684 spin_unlock_bh(&claim->backbone_gw->crc_lock);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200685 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100686 }
687 /* set (new) backbone gw */
Sven Eckelmann06e56de2016-01-16 10:29:43 +0100688 kref_get(&backbone_gw->refcount);
Simon Wunderlich23721382012-01-22 20:00:19 +0100689 claim->backbone_gw = backbone_gw;
690
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200691 spin_lock_bh(&backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100692 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200693 spin_unlock_bh(&backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100694 backbone_gw->lasttime = jiffies;
695
696claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200697 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100698}
699
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100700/**
701 * batadv_bla_del_claim - delete a claim from the claim hash
702 * @bat_priv: the bat priv with all the soft interface information
703 * @mac: mac address of the claim to be removed
704 * @vid: VLAN id for the claim to be removed
Simon Wunderlich23721382012-01-22 20:00:19 +0100705 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200706static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200707 const u8 *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100708{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800709 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100710
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100711 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100712 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200713 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100714 if (!claim)
715 return;
716
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200717 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200718 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100719
Sven Eckelmann807736f2012-07-15 22:26:51 +0200720 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200721 batadv_choose_claim, claim);
722 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100723
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200724 spin_lock_bh(&claim->backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100725 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200726 spin_unlock_bh(&claim->backbone_gw->crc_lock);
Simon Wunderlich23721382012-01-22 20:00:19 +0100727
728 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200729 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100730}
731
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200732/**
733 * batadv_handle_announce - check for ANNOUNCE frame
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100734 * @bat_priv: the bat priv with all the soft interface information
735 * @an_addr: announcement mac address (ARP Sender HW address)
736 * @backbone_addr: originator address of the sender (Ethernet source MAC)
737 * @vid: the VLAN ID of the frame
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200738 *
739 * Return: 1 if handled
740 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200741static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
742 u8 *backbone_addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100743{
Marek Lindnerbae98772012-12-25 17:03:24 +0800744 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200745 u16 backbone_crc, crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100746
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200747 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100748 return 0;
749
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200750 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
751 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100752
753 if (unlikely(!backbone_gw))
754 return 1;
755
Simon Wunderlich23721382012-01-22 20:00:19 +0100756 /* handle as ANNOUNCE frame */
757 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100758 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100759
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200760 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100761 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200762 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100763
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200764 spin_lock_bh(&backbone_gw->crc_lock);
765 backbone_crc = backbone_gw->crc;
766 spin_unlock_bh(&backbone_gw->crc_lock);
767
768 if (backbone_crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200769 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100770 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200771 backbone_gw->orig,
772 BATADV_PRINT_VID(backbone_gw->vid),
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +0200773 backbone_crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100774
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200775 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100776 } else {
777 /* if we have sent a request and the crc was OK,
778 * we can allow traffic again.
779 */
780 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200781 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100782 atomic_set(&backbone_gw->request_sent, 0);
783 }
784 }
785
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200786 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100787 return 1;
788}
789
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200790/**
791 * batadv_handle_request - check for REQUEST frame
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100792 * @bat_priv: the bat priv with all the soft interface information
793 * @primary_if: the primary hard interface of this batman soft interface
794 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
795 * @ethhdr: ethernet header of a packet
796 * @vid: the VLAN ID of the frame
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200797 *
798 * Return: 1 if handled
799 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200800static int batadv_handle_request(struct batadv_priv *bat_priv,
801 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200802 u8 *backbone_addr, struct ethhdr *ethhdr,
803 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100804{
805 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200806 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100807 return 0;
808
809 /* sanity check, this should not happen on a normal switch,
810 * we ignore it in this case.
811 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200812 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100813 return 1;
814
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200815 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200816 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200817 BATADV_PRINT_VID(vid), ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100818
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200819 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100820 return 1;
821}
822
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200823/**
824 * batadv_handle_unclaim - check for UNCLAIM frame
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100825 * @bat_priv: the bat priv with all the soft interface information
826 * @primary_if: the primary hard interface of this batman soft interface
827 * @backbone_addr: originator address of the backbone (Ethernet source)
828 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
829 * @vid: the VLAN ID of the frame
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200830 *
831 * Return: 1 if handled
832 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200833static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
834 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200835 u8 *backbone_addr, u8 *claim_addr,
836 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100837{
Marek Lindnerbae98772012-12-25 17:03:24 +0800838 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100839
840 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200841 if (primary_if && batadv_compare_eth(backbone_addr,
842 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200843 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200844 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100845
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200846 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100847
848 if (!backbone_gw)
849 return 1;
850
851 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200852 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200853 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200854 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100855
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200856 batadv_bla_del_claim(bat_priv, claim_addr, vid);
857 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100858 return 1;
859}
860
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200861/**
862 * batadv_handle_claim - check for CLAIM frame
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100863 * @bat_priv: the bat priv with all the soft interface information
864 * @primary_if: the primary hard interface of this batman soft interface
865 * @backbone_addr: originator address of the backbone (Ethernet Source)
866 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
867 * @vid: the VLAN ID of the frame
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200868 *
869 * Return: 1 if handled
870 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200871static int batadv_handle_claim(struct batadv_priv *bat_priv,
872 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200873 u8 *backbone_addr, u8 *claim_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200874 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100875{
Marek Lindnerbae98772012-12-25 17:03:24 +0800876 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100877
878 /* register the gateway if not yet available, and add the claim. */
879
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200880 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
881 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100882
883 if (unlikely(!backbone_gw))
884 return 1;
885
886 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200887 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200888 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200889 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200890 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100891
892 /* TODO: we could call something like tt_local_del() here. */
893
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200894 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100895 return 1;
896}
897
Ben Hutchings2c530402012-07-10 10:55:09 +0000898/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100899 * batadv_check_claim_group - check for claim group membership
Ben Hutchings2c530402012-07-10 10:55:09 +0000900 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200901 * @primary_if: the primary interface of this batman interface
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100902 * @hw_src: the Hardware source in the ARP Header
903 * @hw_dst: the Hardware destination in the ARP Header
904 * @ethhdr: pointer to the Ethernet header of the claim frame
905 *
906 * checks if it is a claim packet and if its on the same group.
907 * This function also applies the group ID of the sender
908 * if it is in the same mesh.
909 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200910 * Return:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100911 * 2 - if it is a claim packet and on the same group
912 * 1 - if is a claim packet from another group
913 * 0 - if it is not a claim packet
914 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200915static int batadv_check_claim_group(struct batadv_priv *bat_priv,
916 struct batadv_hard_iface *primary_if,
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200917 u8 *hw_src, u8 *hw_dst,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200918 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100919{
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200920 u8 *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200921 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200922 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100923
Sven Eckelmann96412692012-06-05 22:31:30 +0200924 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200925 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100926
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100927 /* if announcement packet, use the source,
928 * otherwise assume it is in the hw_src
929 */
930 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200931 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100932 backbone_addr = hw_src;
933 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200934 case BATADV_CLAIM_TYPE_REQUEST:
935 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200936 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100937 backbone_addr = ethhdr->h_source;
938 break;
939 default:
940 return 0;
941 }
942
943 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200944 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100945 return 0;
946
947 /* if its already the same group, it is fine. */
948 if (bla_dst->group == bla_dst_own->group)
949 return 2;
950
951 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200952 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100953
954 /* dont accept claims from gateways which are not in
955 * the same mesh or group.
956 */
957 if (!orig_node)
958 return 1;
959
960 /* if our mesh friends mac is bigger, use it for ourselves. */
961 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200962 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100963 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200964 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100965 bla_dst_own->group = bla_dst->group;
966 }
967
Sven Eckelmann5d967312016-01-17 11:01:09 +0100968 batadv_orig_node_put(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100969
970 return 2;
971}
972
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100973/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +0100974 * batadv_bla_process_claim - Check if this is a claim frame, and process it
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100975 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200976 * @primary_if: the primary hard interface of this batman soft interface
Simon Wunderlich23721382012-01-22 20:00:19 +0100977 * @skb: the frame to be checked
978 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +0200979 * Return: 1 if it was a claim frame, otherwise return 0 to
Simon Wunderlich23721382012-01-22 20:00:19 +0100980 * tell the callee that it can use the frame on its own.
981 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200982static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
983 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200984 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100985{
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200986 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +0200987 u8 *hw_src, *hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200988 struct vlan_hdr *vhdr, vhdr_buf;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200989 struct ethhdr *ethhdr;
990 struct arphdr *arphdr;
991 unsigned short vid;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200992 int vlan_depth = 0;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200993 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100994 int headlen;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100995 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100996
Antonio Quartullic018ad32013-06-04 12:11:39 +0200997 vid = batadv_get_vid(skb, 0);
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200998 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100999
Antonio Quartullic018ad32013-06-04 12:11:39 +02001000 proto = ethhdr->h_proto;
1001 headlen = ETH_HLEN;
1002 if (vid & BATADV_VLAN_HAS_TAG) {
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +02001003 /* Traverse the VLAN/Ethertypes.
1004 *
1005 * At this point it is known that the first protocol is a VLAN
1006 * header, so start checking at the encapsulated protocol.
1007 *
1008 * The depth of the VLAN headers is recorded to drop BLA claim
1009 * frames encapsulated into multiple VLAN headers (QinQ).
1010 */
1011 do {
1012 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1013 &vhdr_buf);
1014 if (!vhdr)
1015 return 0;
1016
1017 proto = vhdr->h_vlan_encapsulated_proto;
1018 headlen += VLAN_HLEN;
1019 vlan_depth++;
1020 } while (proto == htons(ETH_P_8021Q));
Simon Wunderlich23721382012-01-22 20:00:19 +01001021 }
1022
Antonio Quartulli293e9332013-05-19 12:55:16 +02001023 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +01001024 return 0; /* not a claim frame */
1025
1026 /* this must be a ARP frame. check if it is a claim. */
1027
1028 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1029 return 0;
1030
1031 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001032 ethhdr = eth_hdr(skb);
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001033 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
Simon Wunderlich23721382012-01-22 20:00:19 +01001034
1035 /* Check whether the ARP frame carries a valid
1036 * IP information
1037 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001038 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1039 return 0;
1040 if (arphdr->ar_pro != htons(ETH_P_IP))
1041 return 0;
1042 if (arphdr->ar_hln != ETH_ALEN)
1043 return 0;
1044 if (arphdr->ar_pln != 4)
1045 return 0;
1046
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001047 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +01001048 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +02001049 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +02001050 bla_dst_own = &bat_priv->bla.claim_dest;
1051
1052 /* check if it is a claim frame in general */
1053 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1054 sizeof(bla_dst->magic)) != 0)
1055 return 0;
1056
1057 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1058 * drop that, as this is not supported by BLA but should also not be
1059 * sent via the mesh.
1060 */
1061 if (vlan_depth > 1)
1062 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +01001063
1064 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001065 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1066 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001067 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001068 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001069 "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 +02001070 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
1071 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001072
1073 if (ret < 2)
1074 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +01001075
1076 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001077 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001078
1079 /* check for the different types of claim frames ... */
1080 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +02001081 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001082 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1083 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +01001084 return 1;
1085 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +02001086 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001087 if (batadv_handle_unclaim(bat_priv, primary_if,
1088 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +01001089 return 1;
1090 break;
1091
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001092 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001093 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1094 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +01001095 return 1;
1096 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +02001097 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001098 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1099 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +01001100 return 1;
1101 break;
1102 }
1103
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001104 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001105 "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 +02001106 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +01001107 return 1;
1108}
1109
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001110/**
1111 * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or
1112 * immediately
1113 * @bat_priv: the bat priv with all the soft interface information
1114 * @now: whether the whole hash shall be wiped now
1115 *
1116 * Check when we last heard from other nodes, and remove them in case of
Simon Wunderlich23721382012-01-22 20:00:19 +01001117 * a time out, or clean all backbone gws if now is set.
1118 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001119static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001120{
Marek Lindnerbae98772012-12-25 17:03:24 +08001121 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001122 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +01001123 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001124 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001125 spinlock_t *list_lock; /* protects write access to the hash lists */
1126 int i;
1127
Sven Eckelmann807736f2012-07-15 22:26:51 +02001128 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001129 if (!hash)
1130 return;
1131
1132 for (i = 0; i < hash->size; i++) {
1133 head = &hash->table[i];
1134 list_lock = &hash->list_locks[i];
1135
1136 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08001137 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +01001138 head, hash_entry) {
1139 if (now)
1140 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001141 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001142 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001143 continue;
1144
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001145 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001146 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1147 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +01001148
1149purge_now:
1150 /* don't wait for the pending request anymore */
1151 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +02001152 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +01001153
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001154 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001155
Sasha Levinb67bfe02013-02-27 17:06:00 -08001156 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001157 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001158 }
1159 spin_unlock_bh(list_lock);
1160 }
1161}
1162
Ben Hutchings2c530402012-07-10 10:55:09 +00001163/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001164 * batadv_bla_purge_claims - Remove claims after a timeout or immediately
Ben Hutchings2c530402012-07-10 10:55:09 +00001165 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001166 * @primary_if: the selected primary interface, may be NULL if now is set
1167 * @now: whether the whole hash shall be wiped now
1168 *
1169 * Check when we heard last time from our own claims, and remove them in case of
1170 * a time out, or clean all claims if now is set
1171 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001172static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1173 struct batadv_hard_iface *primary_if,
1174 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001175{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001176 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001177 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001178 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001179 int i;
1180
Sven Eckelmann807736f2012-07-15 22:26:51 +02001181 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001182 if (!hash)
1183 return;
1184
1185 for (i = 0; i < hash->size; i++) {
1186 head = &hash->table[i];
1187
1188 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001189 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001190 if (now)
1191 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001192 if (!batadv_compare_eth(claim->backbone_gw->orig,
1193 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001194 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001195 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001196 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001197 continue;
1198
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001199 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001200 "bla_purge_claims(): %pM, vid %d, time out\n",
1201 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001202
1203purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001204 batadv_handle_unclaim(bat_priv, primary_if,
1205 claim->backbone_gw->orig,
1206 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001207 }
1208 rcu_read_unlock();
1209 }
1210}
1211
Ben Hutchings2c530402012-07-10 10:55:09 +00001212/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001213 * batadv_bla_update_orig_address - Update the backbone gateways when the own
1214 * originator address changes
Ben Hutchings2c530402012-07-10 10:55:09 +00001215 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001216 * @primary_if: the new selected primary_if
1217 * @oldif: the old primary interface, may be NULL
Simon Wunderlich23721382012-01-22 20:00:19 +01001218 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001219void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1220 struct batadv_hard_iface *primary_if,
1221 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001222{
Marek Lindnerbae98772012-12-25 17:03:24 +08001223 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001224 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001225 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001226 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001227 int i;
1228
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001229 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001230 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1231 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001232
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001233 /* purge everything when bridge loop avoidance is turned off */
1234 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1235 oldif = NULL;
1236
Simon Wunderlich23721382012-01-22 20:00:19 +01001237 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001238 batadv_bla_purge_claims(bat_priv, NULL, 1);
1239 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001240 return;
1241 }
1242
Sven Eckelmann807736f2012-07-15 22:26:51 +02001243 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001244 if (!hash)
1245 return;
1246
1247 for (i = 0; i < hash->size; i++) {
1248 head = &hash->table[i];
1249
1250 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001251 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001252 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001253 if (!batadv_compare_eth(backbone_gw->orig,
1254 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001255 continue;
1256
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001257 ether_addr_copy(backbone_gw->orig,
1258 primary_if->net_dev->dev_addr);
Simon Wunderlich23721382012-01-22 20:00:19 +01001259 /* send an announce frame so others will ask for our
1260 * claims and update their tables.
1261 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001262 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001263 }
1264 rcu_read_unlock();
1265 }
1266}
1267
Simon Wunderlichd68081a2015-11-09 16:20:52 +01001268/**
1269 * batadv_bla_status_update - purge bla interfaces if necessary
1270 * @net_dev: the soft interface net device
1271 */
1272void batadv_bla_status_update(struct net_device *net_dev)
1273{
1274 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1275 struct batadv_hard_iface *primary_if;
1276
1277 primary_if = batadv_primary_if_get_selected(bat_priv);
1278 if (!primary_if)
1279 return;
1280
1281 /* this function already purges everything when bla is disabled,
1282 * so just call that one.
1283 */
1284 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1285 batadv_hardif_free_ref(primary_if);
1286}
1287
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001288/**
1289 * batadv_bla_periodic_work - performs periodic bla work
1290 * @work: kernel work struct
1291 *
1292 * periodic work to do:
Simon Wunderlich23721382012-01-22 20:00:19 +01001293 * * purge structures when they are too old
1294 * * send announcements
1295 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001296static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001297{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001298 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001299 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001300 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001301 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001302 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001303 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001304 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001305 int i;
1306
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001307 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001308 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1309 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001310 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001311 if (!primary_if)
1312 goto out;
1313
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001314 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1315 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001316
1317 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1318 goto out;
1319
Sven Eckelmann807736f2012-07-15 22:26:51 +02001320 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001321 if (!hash)
1322 goto out;
1323
1324 for (i = 0; i < hash->size; i++) {
1325 head = &hash->table[i];
1326
1327 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001328 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001329 if (!batadv_compare_eth(backbone_gw->orig,
1330 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001331 continue;
1332
1333 backbone_gw->lasttime = jiffies;
1334
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001335 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001336
1337 /* request_sent is only set after creation to avoid
1338 * problems when we are not yet known as backbone gw
1339 * in the backbone.
1340 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001341 * We can reset this now after we waited some periods
1342 * to give bridge forward delays and bla group forming
1343 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001344 */
1345
1346 if (atomic_read(&backbone_gw->request_sent) == 0)
1347 continue;
1348
Simon Wunderlich28709872012-09-13 18:18:46 +02001349 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1350 continue;
1351
Simon Wunderlichd807f272012-09-09 22:27:57 +02001352 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1353 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001354 }
1355 rcu_read_unlock();
1356 }
1357out:
1358 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001359 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001360
Antonio Quartulli72414442012-12-25 13:14:37 +01001361 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1362 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001363}
1364
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001365/* The hash for claim and backbone hash receive the same key because they
1366 * are getting initialized by hash_new with the same key. Reinitializing
1367 * them with to different keys to allow nested locking without generating
1368 * lockdep warnings
1369 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001370static struct lock_class_key batadv_claim_hash_lock_class_key;
1371static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001372
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001373/**
1374 * batadv_bla_init - initialize all bla structures
1375 * @bat_priv: the bat priv with all the soft interface information
1376 *
1377 * Return: 0 on success, < 0 on error.
1378 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001379int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001380{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001381 int i;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001382 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001383 struct batadv_hard_iface *primary_if;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001384 u16 crc;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001385 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001386
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001387 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1388
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001389 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001390
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001391 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001392 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1393 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001394 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001395 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001396 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1397 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001398 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001399 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001400 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001401 }
1402
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001403 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001404 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001405 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001406 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1407 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001408
Sven Eckelmann807736f2012-07-15 22:26:51 +02001409 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001410 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001411
Sven Eckelmann807736f2012-07-15 22:26:51 +02001412 bat_priv->bla.claim_hash = batadv_hash_new(128);
1413 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001414
Sven Eckelmann807736f2012-07-15 22:26:51 +02001415 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001416 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001417
Sven Eckelmann807736f2012-07-15 22:26:51 +02001418 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001419 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001420 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001421 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001422
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001423 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001424
Antonio Quartulli72414442012-12-25 13:14:37 +01001425 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1426
1427 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1428 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001429 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001430}
1431
Ben Hutchings2c530402012-07-10 10:55:09 +00001432/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001433 * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup.
Ben Hutchings2c530402012-07-10 10:55:09 +00001434 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001435 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001436 *
1437 * check if it is on our broadcast list. Another gateway might
1438 * have sent the same packet because it is connected to the same backbone,
1439 * so we have to remove this duplicate.
1440 *
1441 * This is performed by checking the CRC, which will tell us
1442 * with a good chance that it is the same packet. If it is furthermore
1443 * sent by another host, drop it. We allow equal packets from
1444 * the same host however as this might be intended.
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001445 *
1446 * Return: 1 if a packet is in the duplicate list, 0 otherwise.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001447 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001448int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001449 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001450{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001451 int i, curr, ret = 0;
1452 __be32 crc;
1453 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001454 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001455
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001456 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001457
1458 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001459 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001460
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001461 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1462
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001463 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001464 curr = (bat_priv->bla.bcast_duplist_curr + i);
1465 curr %= BATADV_DUPLIST_SIZE;
1466 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001467
1468 /* we can stop searching if the entry is too old ;
1469 * later entries will be even older
1470 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001471 if (batadv_has_timed_out(entry->entrytime,
1472 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001473 break;
1474
1475 if (entry->crc != crc)
1476 continue;
1477
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001478 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001479 continue;
1480
1481 /* this entry seems to match: same crc, not too old,
1482 * and from another gw. therefore return 1 to forbid it.
1483 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001484 ret = 1;
1485 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001486 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001487 /* not found, add a new entry (overwrite the oldest entry)
Antonio Quartulli3f687852014-11-02 11:29:56 +01001488 * and allow it, its the first occurrence.
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001489 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001490 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001491 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001492 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001493 entry->crc = crc;
1494 entry->entrytime = jiffies;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001495 ether_addr_copy(entry->orig, bcast_packet->orig);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001496 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001497
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001498out:
1499 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1500
1501 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001502}
1503
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001504/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001505 * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for
1506 * the VLAN identified by vid.
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001507 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001508 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001509 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001510 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001511 * Return: true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001512 */
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001513bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001514 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001515{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001516 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001517 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001518 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001519 int i;
1520
1521 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001522 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001523
1524 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001525 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001526
1527 for (i = 0; i < hash->size; i++) {
1528 head = &hash->table[i];
1529
1530 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001531 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001532 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1533 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001534 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001535 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001536 }
1537 }
1538 rcu_read_unlock();
1539 }
1540
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001541 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001542}
1543
Ben Hutchings2c530402012-07-10 10:55:09 +00001544/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001545 * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN.
Ben Hutchings2c530402012-07-10 10:55:09 +00001546 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001547 * @orig_node: the orig_node of the frame
1548 * @hdr_size: maximum length of the frame
1549 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001550 * Return: 1 if the orig_node is also a gateway on the soft interface, otherwise
1551 * it returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001552 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001553int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001554 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001555{
Marek Lindnerbae98772012-12-25 17:03:24 +08001556 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001557 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001558
1559 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1560 return 0;
1561
1562 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001563 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001564 return 0;
1565
Antonio Quartullic018ad32013-06-04 12:11:39 +02001566 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001567
1568 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001569 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1570 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001571 if (!backbone_gw)
1572 return 0;
1573
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001574 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001575 return 1;
1576}
1577
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001578/**
1579 * batadv_bla_init - free all bla structures
1580 * @bat_priv: the bat priv with all the soft interface information
1581 *
1582 * for softinterface free or module unload
1583 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001584void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001585{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001586 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001587
Sven Eckelmann807736f2012-07-15 22:26:51 +02001588 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001589 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001590
Sven Eckelmann807736f2012-07-15 22:26:51 +02001591 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001592 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001593 batadv_hash_destroy(bat_priv->bla.claim_hash);
1594 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001595 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001596 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001597 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001598 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1599 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001600 }
1601 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001602 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001603}
1604
Ben Hutchings2c530402012-07-10 10:55:09 +00001605/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001606 * batadv_bla_rx - check packets coming from the mesh.
Ben Hutchings2c530402012-07-10 10:55:09 +00001607 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001608 * @skb: the frame to be checked
1609 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001610 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001611 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001612 * batadv_bla_rx avoidance checks if:
Simon Wunderlich23721382012-01-22 20:00:19 +01001613 * * we have to race for a claim
1614 * * if the frame is allowed on the LAN
1615 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001616 * in these cases, the skb is further handled by this function
1617 *
1618 * Return: 1 if handled, otherwise it returns 0 and the caller shall further
Simon Wunderlich23721382012-01-22 20:00:19 +01001619 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001620 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001621int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1622 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001623{
1624 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001625 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001626 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001627 int ret;
1628
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001629 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001630
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001631 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001632 if (!primary_if)
1633 goto handled;
1634
1635 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1636 goto allow;
1637
Sven Eckelmann807736f2012-07-15 22:26:51 +02001638 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001639 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001640 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001641 goto handled;
1642
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001643 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001644 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001645 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001646
1647 if (!claim) {
1648 /* possible optimization: race for a claim */
1649 /* No claim exists yet, claim it for us!
1650 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001651 batadv_handle_claim(bat_priv, primary_if,
1652 primary_if->net_dev->dev_addr,
1653 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001654 goto allow;
1655 }
1656
1657 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001658 if (batadv_compare_eth(claim->backbone_gw->orig,
1659 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001660 /* ... allow it in any case */
1661 claim->lasttime = jiffies;
1662 goto allow;
1663 }
1664
1665 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001666 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1667 /* ... drop it. the responsible gateway is in charge.
1668 *
1669 * We need to check is_bcast because with the gateway
1670 * feature, broadcasts (like DHCP requests) may be sent
1671 * using a unicast packet type.
1672 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001673 goto handled;
1674 } else {
1675 /* seems the client considers us as its best gateway.
1676 * send a claim and update the claim table
1677 * immediately.
1678 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001679 batadv_handle_claim(bat_priv, primary_if,
1680 primary_if->net_dev->dev_addr,
1681 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001682 goto allow;
1683 }
1684allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001685 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001686 ret = 0;
1687 goto out;
1688
1689handled:
1690 kfree_skb(skb);
1691 ret = 1;
1692
1693out:
1694 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001695 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001696 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001697 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001698 return ret;
1699}
1700
Ben Hutchings2c530402012-07-10 10:55:09 +00001701/**
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001702 * batadv_bla_tx - check packets going into the mesh
Ben Hutchings2c530402012-07-10 10:55:09 +00001703 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001704 * @skb: the frame to be checked
1705 * @vid: the VLAN ID of the frame
1706 *
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001707 * batadv_bla_tx checks if:
Simon Wunderlich23721382012-01-22 20:00:19 +01001708 * * a claim was received which has to be processed
1709 * * the frame is allowed on the mesh
1710 *
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001711 * in these cases, the skb is further handled by this function.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001712 *
1713 * This call might reallocate skb data.
Sven Eckelmann62fe7102015-09-15 19:00:48 +02001714 *
1715 * Return: 1 if handled, otherwise it returns 0 and the caller shall further
1716 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001717 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001718int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1719 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001720{
1721 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001722 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001723 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001724 int ret = 0;
1725
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001726 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001727 if (!primary_if)
1728 goto out;
1729
1730 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1731 goto allow;
1732
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001733 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001734 goto handled;
1735
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001736 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001737
Sven Eckelmann807736f2012-07-15 22:26:51 +02001738 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001739 /* don't allow broadcasts while requests are in flight */
1740 if (is_multicast_ether_addr(ethhdr->h_dest))
1741 goto handled;
1742
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001743 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001744 search_claim.vid = vid;
1745
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001746 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001747
1748 /* if no claim exists, allow it. */
1749 if (!claim)
1750 goto allow;
1751
1752 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001753 if (batadv_compare_eth(claim->backbone_gw->orig,
1754 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001755 /* if yes, the client has roamed and we have
1756 * to unclaim it.
1757 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001758 batadv_handle_unclaim(bat_priv, primary_if,
1759 primary_if->net_dev->dev_addr,
1760 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001761 goto allow;
1762 }
1763
1764 /* check if it is a multicast/broadcast frame */
1765 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1766 /* drop it. the responsible gateway has forwarded it into
1767 * the backbone network.
1768 */
1769 goto handled;
1770 } else {
1771 /* we must allow it. at least if we are
1772 * responsible for the DESTINATION.
1773 */
1774 goto allow;
1775 }
1776allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001777 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001778 ret = 0;
1779 goto out;
1780handled:
1781 ret = 1;
1782out:
1783 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001784 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001785 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001786 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001787 return ret;
1788}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001789
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001790/**
1791 * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file
1792 * @seq: seq file to print on
1793 * @offset: not used
1794 *
1795 * Return: always 0
1796 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001797int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001798{
1799 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001800 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001801 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001802 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001803 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001804 struct hlist_head *head;
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001805 u16 backbone_crc;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001806 u32 i;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001807 bool is_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001808 u8 *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001809
Marek Lindner30da63a2012-08-03 17:15:46 +02001810 primary_if = batadv_seq_print_text_primary_if_get(seq);
1811 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001812 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001813
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001814 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001815 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001816 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001817 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001818 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001819 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001820 "Client", "VID", "Originator", "CRC");
1821 for (i = 0; i < hash->size; i++) {
1822 head = &hash->table[i];
1823
1824 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001825 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001826 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1827 primary_addr);
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001828
1829 spin_lock_bh(&claim->backbone_gw->crc_lock);
1830 backbone_crc = claim->backbone_gw->crc;
1831 spin_unlock_bh(&claim->backbone_gw->crc_lock);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001832 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001833 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001834 claim->backbone_gw->orig,
1835 (is_own ? 'x' : ' '),
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001836 backbone_crc);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001837 }
1838 rcu_read_unlock();
1839 }
1840out:
1841 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001842 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001843 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001844}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001845
Simon Wunderlich04e14be2015-11-06 10:45:19 +01001846/**
1847 * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq
1848 * file
1849 * @seq: seq file to print on
1850 * @offset: not used
1851 *
1852 * Return: always 0
1853 */
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001854int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1855{
1856 struct net_device *net_dev = (struct net_device *)seq->private;
1857 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001858 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001859 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001860 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001861 struct hlist_head *head;
1862 int secs, msecs;
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001863 u16 backbone_crc;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001864 u32 i;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001865 bool is_own;
Sven Eckelmann6b5e9712015-05-26 18:34:26 +02001866 u8 *primary_addr;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001867
Marek Lindner30da63a2012-08-03 17:15:46 +02001868 primary_if = batadv_seq_print_text_primary_if_get(seq);
1869 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001870 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001871
1872 primary_addr = primary_if->net_dev->dev_addr;
1873 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001874 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001875 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001876 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001877 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001878 "Originator", "VID", "last seen", "CRC");
1879 for (i = 0; i < hash->size; i++) {
1880 head = &hash->table[i];
1881
1882 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001883 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001884 msecs = jiffies_to_msecs(jiffies -
1885 backbone_gw->lasttime);
1886 secs = msecs / 1000;
1887 msecs = msecs % 1000;
1888
1889 is_own = batadv_compare_eth(backbone_gw->orig,
1890 primary_addr);
1891 if (is_own)
1892 continue;
1893
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001894 spin_lock_bh(&backbone_gw->crc_lock);
1895 backbone_crc = backbone_gw->crc;
1896 spin_unlock_bh(&backbone_gw->crc_lock);
1897
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001898 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001899 backbone_gw->orig,
1900 BATADV_PRINT_VID(backbone_gw->vid), secs,
Simon Wunderlich5a1dd8a2015-09-11 18:04:13 +02001901 msecs, backbone_crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001902 }
1903 rcu_read_unlock();
1904 }
1905out:
1906 if (primary_if)
1907 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001908 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001909}