blob: 05f0712be5e7fe3b1fe357d454e6eb9e6c779fc5 [file] [log] [blame]
Simon Wunderliche19f9752014-01-04 18:04:25 +01001/* Copyright (C) 2011-2014 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
18#include "main.h"
19#include "hash.h"
20#include "hard-interface.h"
21#include "originator.h"
22#include "bridge_loop_avoidance.h"
Simon Wunderlich20ff9d52012-01-22 20:00:23 +010023#include "translation-table.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010024#include "send.h"
25
26#include <linux/etherdevice.h>
27#include <linux/crc16.h>
28#include <linux/if_arp.h>
29#include <net/arp.h>
30#include <linux/if_vlan.h>
31
Sven Eckelmann3b300de2012-05-12 18:33:53 +020032static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
Simon Wunderlich23721382012-01-22 20:00:19 +010033
Sven Eckelmann3b300de2012-05-12 18:33:53 +020034static void batadv_bla_periodic_work(struct work_struct *work);
Marek Lindnerbae98772012-12-25 17:03:24 +080035static void
36batadv_bla_send_announce(struct batadv_priv *bat_priv,
37 struct batadv_bla_backbone_gw *backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +010038
39/* return the index of the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020040static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010041{
Marek Lindner712bbfe42012-12-25 17:03:25 +080042 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010043 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010044
Simon Wunderlich07568d02012-08-30 18:22:27 +020045 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
46 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010047
48 hash += (hash << 3);
49 hash ^= (hash >> 11);
50 hash += (hash << 15);
51
52 return hash % size;
53}
54
55/* return the index of the backbone gateway */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020056static inline uint32_t batadv_choose_backbone_gw(const void *data,
57 uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010058{
Marek Lindner712bbfe42012-12-25 17:03:25 +080059 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010060 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010061
Simon Wunderlich07568d02012-08-30 18:22:27 +020062 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
63 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010064
65 hash += (hash << 3);
66 hash ^= (hash >> 11);
67 hash += (hash << 15);
68
69 return hash % size;
70}
71
72
73/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020074static int batadv_compare_backbone_gw(const struct hlist_node *node,
75 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010076{
Marek Lindnerbae98772012-12-25 17:03:24 +080077 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010078 hash_entry);
Marek Lindnerbae98772012-12-25 17:03:24 +080079 const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010080
Simon Wunderlichc76d1522012-10-15 22:38:04 +020081 if (!batadv_compare_eth(gw1->orig, gw2->orig))
82 return 0;
83
84 if (gw1->vid != gw2->vid)
85 return 0;
86
87 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +010088}
89
90/* compares address and vid of two claims */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020091static int batadv_compare_claim(const struct hlist_node *node,
92 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010093{
Marek Lindner712bbfe42012-12-25 17:03:25 +080094 const void *data1 = container_of(node, struct batadv_bla_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +010095 hash_entry);
Marek Lindner712bbfe42012-12-25 17:03:25 +080096 const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010097
Simon Wunderlichc76d1522012-10-15 22:38:04 +020098 if (!batadv_compare_eth(cl1->addr, cl2->addr))
99 return 0;
100
101 if (cl1->vid != cl2->vid)
102 return 0;
103
104 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100105}
106
107/* free a backbone gw */
Marek Lindnerbae98772012-12-25 17:03:24 +0800108static void
109batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100110{
111 if (atomic_dec_and_test(&backbone_gw->refcount))
112 kfree_rcu(backbone_gw, rcu);
113}
114
115/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200116static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100117{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800118 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100119
Marek Lindner712bbfe42012-12-25 17:03:25 +0800120 claim = container_of(rcu, struct batadv_bla_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100121
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200122 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100123 kfree(claim);
124}
125
126/* free a claim, call claim_free_rcu if its the last reference */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800127static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100128{
129 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200130 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100131}
132
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100133/**
134 * batadv_claim_hash_find
135 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100136 * @data: search data (may be local/static data)
137 *
138 * looks for a claim in the hash, and returns it if found
139 * or NULL otherwise.
140 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800141static struct batadv_bla_claim
142*batadv_claim_hash_find(struct batadv_priv *bat_priv,
143 struct batadv_bla_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100144{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200145 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100146 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800147 struct batadv_bla_claim *claim;
148 struct batadv_bla_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100149 int index;
150
151 if (!hash)
152 return NULL;
153
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200154 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100155 head = &hash->table[index];
156
157 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800158 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200159 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100160 continue;
161
162 if (!atomic_inc_not_zero(&claim->refcount))
163 continue;
164
165 claim_tmp = claim;
166 break;
167 }
168 rcu_read_unlock();
169
170 return claim_tmp;
171}
172
Ben Hutchings2c530402012-07-10 10:55:09 +0000173/**
174 * batadv_backbone_hash_find - looks for a claim in the hash
175 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100176 * @addr: the address of the originator
177 * @vid: the VLAN ID
178 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000179 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100180 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800181static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200182batadv_backbone_hash_find(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200183 uint8_t *addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100184{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200185 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100186 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +0800187 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
188 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100189 int index;
190
191 if (!hash)
192 return NULL;
193
194 memcpy(search_entry.orig, addr, ETH_ALEN);
195 search_entry.vid = vid;
196
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200197 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100198 head = &hash->table[index];
199
200 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800201 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200202 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
203 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100204 continue;
205
206 if (!atomic_inc_not_zero(&backbone_gw->refcount))
207 continue;
208
209 backbone_gw_tmp = backbone_gw;
210 break;
211 }
212 rcu_read_unlock();
213
214 return backbone_gw_tmp;
215}
216
217/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200218static void
Marek Lindnerbae98772012-12-25 17:03:24 +0800219batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100220{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200221 struct batadv_hashtable *hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800222 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100223 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800224 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100225 int i;
226 spinlock_t *list_lock; /* protects write access to the hash lists */
227
Sven Eckelmann807736f2012-07-15 22:26:51 +0200228 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100229 if (!hash)
230 return;
231
232 for (i = 0; i < hash->size; i++) {
233 head = &hash->table[i];
234 list_lock = &hash->list_locks[i];
235
236 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800237 hlist_for_each_entry_safe(claim, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100238 head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100239 if (claim->backbone_gw != backbone_gw)
240 continue;
241
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200242 batadv_claim_free_ref(claim);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800243 hlist_del_rcu(&claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100244 }
245 spin_unlock_bh(list_lock);
246 }
247
248 /* all claims gone, intialize CRC */
Sven Eckelmann3964f722012-06-03 22:19:10 +0200249 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100250}
251
Ben Hutchings2c530402012-07-10 10:55:09 +0000252/**
253 * batadv_bla_send_claim - sends a claim frame according to the provided info
254 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100255 * @orig: the mac address to be announced within the claim
256 * @vid: the VLAN ID
257 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100258 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200259static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200260 unsigned short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100261{
262 struct sk_buff *skb;
263 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200264 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100265 struct net_device *soft_iface;
266 uint8_t *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200267 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100268 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100269
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200270 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100271 if (!primary_if)
272 return;
273
Sven Eckelmann807736f2012-07-15 22:26:51 +0200274 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100275 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100276 local_claim_dest.type = claimtype;
277
278 soft_iface = primary_if->soft_iface;
279
280 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
281 /* IP DST: 0.0.0.0 */
282 zeroip,
283 primary_if->soft_iface,
284 /* IP SRC: 0.0.0.0 */
285 zeroip,
286 /* Ethernet DST: Broadcast */
287 NULL,
288 /* Ethernet SRC/HW SRC: originator mac */
289 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200290 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100291 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100292 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100293 */
294 (uint8_t *)&local_claim_dest);
295
296 if (!skb)
297 goto out;
298
299 ethhdr = (struct ethhdr *)skb->data;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100300 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100301
302 /* now we pretend that the client would have sent this ... */
303 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200304 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100305 /* normal claim frame
306 * set Ethernet SRC to the clients mac
307 */
308 memcpy(ethhdr->h_source, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200309 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200310 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
311 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100312 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200313 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100314 /* unclaim frame
315 * set HW SRC to the clients mac
316 */
317 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200318 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200319 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200320 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100321 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200322 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100323 /* announcement frame
324 * set HW SRC to the special mac containg the crc
325 */
326 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200327 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200328 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200329 ethhdr->h_source, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100330 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200331 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100332 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200333 * set HW SRC and header destination to the receiving backbone
334 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100335 */
336 memcpy(hw_src, mac, ETH_ALEN);
337 memcpy(ethhdr->h_dest, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200338 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200339 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200340 ethhdr->h_source, ethhdr->h_dest,
341 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100342 break;
Simon Wunderlich23721382012-01-22 20:00:19 +0100343 }
344
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200345 if (vid & BATADV_VLAN_HAS_TAG)
346 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
347 vid & VLAN_VID_MASK);
Simon Wunderlich23721382012-01-22 20:00:19 +0100348
349 skb_reset_mac_header(skb);
350 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200351 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
352 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
353 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100354 soft_iface->last_rx = jiffies;
355
356 netif_rx(skb);
357out:
358 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200359 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100360}
361
Ben Hutchings2c530402012-07-10 10:55:09 +0000362/**
363 * batadv_bla_get_backbone_gw
364 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100365 * @orig: the mac address of the originator
366 * @vid: the VLAN ID
367 *
368 * searches for the backbone gw or creates a new one if it could not
369 * be found.
370 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800371static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200372batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200373 unsigned short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100374{
Marek Lindnerbae98772012-12-25 17:03:24 +0800375 struct batadv_bla_backbone_gw *entry;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200376 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100377 int hash_added;
378
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200379 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100380
381 if (entry)
382 return entry;
383
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200384 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200385 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200386 orig, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100387
388 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
389 if (!entry)
390 return NULL;
391
392 entry->vid = vid;
393 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200394 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100395 entry->bat_priv = bat_priv;
396 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200397 atomic_set(&entry->wait_periods, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +0100398 memcpy(entry->orig, orig, ETH_ALEN);
399
400 /* one for the hash, one for returning */
401 atomic_set(&entry->refcount, 2);
402
Sven Eckelmann807736f2012-07-15 22:26:51 +0200403 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200404 batadv_compare_backbone_gw,
405 batadv_choose_backbone_gw, entry,
406 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100407
408 if (unlikely(hash_added != 0)) {
409 /* hash failed, free the structure */
410 kfree(entry);
411 return NULL;
412 }
413
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200414 /* this is a gateway now, remove any TT entry on this VLAN */
Sven Eckelmannda641192012-05-12 13:48:56 +0200415 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100416 if (orig_node) {
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200417 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200418 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200419 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100420 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200421
Simon Wunderlichd807f272012-09-09 22:27:57 +0200422 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200423 batadv_bla_send_announce(bat_priv, entry);
424
Simon Wunderlichd807f272012-09-09 22:27:57 +0200425 /* this will be decreased in the worker thread */
426 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200427 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200428 atomic_inc(&bat_priv->bla.num_requests);
429 }
430
Simon Wunderlich23721382012-01-22 20:00:19 +0100431 return entry;
432}
433
434/* update or add the own backbone gw to make sure we announce
435 * where we receive other backbone gws
436 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200437static void
438batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
439 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200440 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100441{
Marek Lindnerbae98772012-12-25 17:03:24 +0800442 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100443
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200444 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
445 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200446 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100447 if (unlikely(!backbone_gw))
448 return;
449
450 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200451 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100452}
453
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100454/**
455 * batadv_bla_answer_request - answer a bla request by sending own claims
456 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100457 * @vid: the vid where the request came on
458 *
459 * Repeat all of our own claims, and finally send an ANNOUNCE frame
460 * to allow the requester another check if the CRC is correct now.
461 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200462static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
463 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200464 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100465{
Simon Wunderlich23721382012-01-22 20:00:19 +0100466 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200467 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800468 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800469 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100470 int i;
471
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200472 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200473 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100474
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200475 backbone_gw = batadv_backbone_hash_find(bat_priv,
476 primary_if->net_dev->dev_addr,
477 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100478 if (!backbone_gw)
479 return;
480
Sven Eckelmann807736f2012-07-15 22:26:51 +0200481 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100482 for (i = 0; i < hash->size; i++) {
483 head = &hash->table[i];
484
485 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800486 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100487 /* only own claims are interesting */
488 if (claim->backbone_gw != backbone_gw)
489 continue;
490
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200491 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200492 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100493 }
494 rcu_read_unlock();
495 }
496
497 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200498 batadv_bla_send_announce(bat_priv, backbone_gw);
499 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100500}
501
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100502/**
503 * batadv_bla_send_request - send a request to repeat claims
504 * @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100505 *
506 * When the crc is wrong, ask the backbone gateway for a full table update.
507 * After the request, it will repeat all of his own claims and finally
508 * send an announcement claim with which we can check again.
509 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800510static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100511{
512 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200513 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100514
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200515 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
516 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100517
518 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200519 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200520 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100521
522 /* no local broadcasts should be sent or received, for now. */
523 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200524 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100525 atomic_set(&backbone_gw->request_sent, 1);
526 }
527}
528
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100529/**
530 * batadv_bla_send_announce
531 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100532 * @backbone_gw: our backbone gateway which should be announced
533 *
534 * This function sends an announcement. It is called from multiple
535 * places.
536 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200537static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800538 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100539{
540 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100541 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100542
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200543 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100544 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100545 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100546
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200547 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200548 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100549}
550
Ben Hutchings2c530402012-07-10 10:55:09 +0000551/**
552 * batadv_bla_add_claim - Adds a claim in the claim hash
553 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100554 * @mac: the mac address of the claim
555 * @vid: the VLAN ID of the frame
556 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100557 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200558static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200559 const uint8_t *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800560 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100561{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800562 struct batadv_bla_claim *claim;
563 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100564 int hash_added;
565
566 memcpy(search_claim.addr, mac, ETH_ALEN);
567 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200568 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100569
570 /* create a new claim entry if it does not exist yet. */
571 if (!claim) {
572 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
573 if (!claim)
574 return;
575
576 memcpy(claim->addr, mac, ETH_ALEN);
577 claim->vid = vid;
578 claim->lasttime = jiffies;
579 claim->backbone_gw = backbone_gw;
580
581 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200582 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200583 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200584 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200585 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200586 batadv_compare_claim,
587 batadv_choose_claim, claim,
588 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100589
590 if (unlikely(hash_added != 0)) {
591 /* only local changes happened. */
592 kfree(claim);
593 return;
594 }
595 } else {
596 claim->lasttime = jiffies;
597 if (claim->backbone_gw == backbone_gw)
598 /* no need to register a new backbone */
599 goto claim_free_ref;
600
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200601 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200602 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200603 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100604
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200605 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200606 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100607 }
608 /* set (new) backbone gw */
609 atomic_inc(&backbone_gw->refcount);
610 claim->backbone_gw = backbone_gw;
611
612 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
613 backbone_gw->lasttime = jiffies;
614
615claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200616 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100617}
618
619/* Delete a claim from the claim hash which has the
620 * given mac address and vid.
621 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200622static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200623 const uint8_t *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100624{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800625 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100626
627 memcpy(search_claim.addr, mac, ETH_ALEN);
628 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200629 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100630 if (!claim)
631 return;
632
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200633 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200634 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100635
Sven Eckelmann807736f2012-07-15 22:26:51 +0200636 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200637 batadv_choose_claim, claim);
638 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100639
640 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
641
642 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200643 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100644}
645
646/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200647static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200648 uint8_t *an_addr, uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200649 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100650{
Marek Lindnerbae98772012-12-25 17:03:24 +0800651 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100652 uint16_t crc;
653
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200654 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100655 return 0;
656
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200657 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
658 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100659
660 if (unlikely(!backbone_gw))
661 return 1;
662
663
664 /* handle as ANNOUNCE frame */
665 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100666 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100667
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200668 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100669 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200670 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100671
672 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200673 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100674 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200675 backbone_gw->orig,
676 BATADV_PRINT_VID(backbone_gw->vid),
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200677 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100678
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200679 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100680 } else {
681 /* if we have sent a request and the crc was OK,
682 * we can allow traffic again.
683 */
684 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200685 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100686 atomic_set(&backbone_gw->request_sent, 0);
687 }
688 }
689
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200690 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100691 return 1;
692}
693
694/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200695static int batadv_handle_request(struct batadv_priv *bat_priv,
696 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200697 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200698 struct ethhdr *ethhdr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100699{
700 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200701 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100702 return 0;
703
704 /* sanity check, this should not happen on a normal switch,
705 * we ignore it in this case.
706 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200707 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100708 return 1;
709
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200710 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200711 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200712 BATADV_PRINT_VID(vid), ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100713
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200714 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100715 return 1;
716}
717
718/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200719static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
720 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200721 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200722 uint8_t *claim_addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100723{
Marek Lindnerbae98772012-12-25 17:03:24 +0800724 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100725
726 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200727 if (primary_if && batadv_compare_eth(backbone_addr,
728 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200729 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200730 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100731
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200732 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100733
734 if (!backbone_gw)
735 return 1;
736
737 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200738 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200739 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200740 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100741
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200742 batadv_bla_del_claim(bat_priv, claim_addr, vid);
743 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100744 return 1;
745}
746
747/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200748static int batadv_handle_claim(struct batadv_priv *bat_priv,
749 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200750 uint8_t *backbone_addr, uint8_t *claim_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200751 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100752{
Marek Lindnerbae98772012-12-25 17:03:24 +0800753 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100754
755 /* register the gateway if not yet available, and add the claim. */
756
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200757 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
758 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100759
760 if (unlikely(!backbone_gw))
761 return 1;
762
763 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200764 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200765 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200766 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200767 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100768
769 /* TODO: we could call something like tt_local_del() here. */
770
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200771 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100772 return 1;
773}
774
Ben Hutchings2c530402012-07-10 10:55:09 +0000775/**
776 * batadv_check_claim_group
777 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100778 * @hw_src: the Hardware source in the ARP Header
779 * @hw_dst: the Hardware destination in the ARP Header
780 * @ethhdr: pointer to the Ethernet header of the claim frame
781 *
782 * checks if it is a claim packet and if its on the same group.
783 * This function also applies the group ID of the sender
784 * if it is in the same mesh.
785 *
786 * returns:
787 * 2 - if it is a claim packet and on the same group
788 * 1 - if is a claim packet from another group
789 * 0 - if it is not a claim packet
790 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200791static int batadv_check_claim_group(struct batadv_priv *bat_priv,
792 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200793 uint8_t *hw_src, uint8_t *hw_dst,
794 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100795{
796 uint8_t *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200797 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200798 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100799
Sven Eckelmann96412692012-06-05 22:31:30 +0200800 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200801 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100802
803 /* check if it is a claim packet in general */
804 if (memcmp(bla_dst->magic, bla_dst_own->magic,
805 sizeof(bla_dst->magic)) != 0)
806 return 0;
807
808 /* if announcement packet, use the source,
809 * otherwise assume it is in the hw_src
810 */
811 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200812 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100813 backbone_addr = hw_src;
814 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200815 case BATADV_CLAIM_TYPE_REQUEST:
816 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200817 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100818 backbone_addr = ethhdr->h_source;
819 break;
820 default:
821 return 0;
822 }
823
824 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200825 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100826 return 0;
827
828 /* if its already the same group, it is fine. */
829 if (bla_dst->group == bla_dst_own->group)
830 return 2;
831
832 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200833 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100834
835 /* dont accept claims from gateways which are not in
836 * the same mesh or group.
837 */
838 if (!orig_node)
839 return 1;
840
841 /* if our mesh friends mac is bigger, use it for ourselves. */
842 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200843 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100844 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200845 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100846 bla_dst_own->group = bla_dst->group;
847 }
848
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200849 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100850
851 return 2;
852}
853
854
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100855/**
856 * batadv_bla_process_claim
857 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100858 * @skb: the frame to be checked
859 *
860 * Check if this is a claim frame, and process it accordingly.
861 *
862 * returns 1 if it was a claim frame, otherwise return 0 to
863 * tell the callee that it can use the frame on its own.
864 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200865static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
866 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200867 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100868{
Sven Eckelmann96412692012-06-05 22:31:30 +0200869 struct batadv_bla_claim_dst *bla_dst;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200870 uint8_t *hw_src, *hw_dst;
871 struct vlan_ethhdr *vhdr;
872 struct ethhdr *ethhdr;
873 struct arphdr *arphdr;
874 unsigned short vid;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200875 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100876 int headlen;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100877 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100878
Antonio Quartullic018ad32013-06-04 12:11:39 +0200879 vid = batadv_get_vid(skb, 0);
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200880 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100881
Antonio Quartullic018ad32013-06-04 12:11:39 +0200882 proto = ethhdr->h_proto;
883 headlen = ETH_HLEN;
884 if (vid & BATADV_VLAN_HAS_TAG) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100885 vhdr = (struct vlan_ethhdr *)ethhdr;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200886 proto = vhdr->h_vlan_encapsulated_proto;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200887 headlen += VLAN_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100888 }
889
Antonio Quartulli293e9332013-05-19 12:55:16 +0200890 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100891 return 0; /* not a claim frame */
892
893 /* this must be a ARP frame. check if it is a claim. */
894
895 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
896 return 0;
897
898 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200899 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100900 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
901
902 /* Check whether the ARP frame carries a valid
903 * IP information
904 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100905 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
906 return 0;
907 if (arphdr->ar_pro != htons(ETH_P_IP))
908 return 0;
909 if (arphdr->ar_hln != ETH_ALEN)
910 return 0;
911 if (arphdr->ar_pln != 4)
912 return 0;
913
914 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
915 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200916 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100917
918 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200919 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
920 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100921 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200922 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200923 "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 +0200924 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
925 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100926
927 if (ret < 2)
928 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100929
930 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200931 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100932
933 /* check for the different types of claim frames ... */
934 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200935 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200936 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
937 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100938 return 1;
939 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200940 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200941 if (batadv_handle_unclaim(bat_priv, primary_if,
942 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100943 return 1;
944 break;
945
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200946 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200947 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
948 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100949 return 1;
950 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200951 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200952 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
953 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100954 return 1;
955 break;
956 }
957
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200958 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200959 "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 +0200960 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100961 return 1;
962}
963
964/* Check when we last heard from other nodes, and remove them in case of
965 * a time out, or clean all backbone gws if now is set.
966 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200967static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100968{
Marek Lindnerbae98772012-12-25 17:03:24 +0800969 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800970 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100971 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200972 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100973 spinlock_t *list_lock; /* protects write access to the hash lists */
974 int i;
975
Sven Eckelmann807736f2012-07-15 22:26:51 +0200976 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100977 if (!hash)
978 return;
979
980 for (i = 0; i < hash->size; i++) {
981 head = &hash->table[i];
982 list_lock = &hash->list_locks[i];
983
984 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800985 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100986 head, hash_entry) {
987 if (now)
988 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200989 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200990 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +0100991 continue;
992
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200993 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200994 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
995 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100996
997purge_now:
998 /* don't wait for the pending request anymore */
999 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +02001000 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +01001001
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001002 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001003
Sasha Levinb67bfe02013-02-27 17:06:00 -08001004 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001005 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001006 }
1007 spin_unlock_bh(list_lock);
1008 }
1009}
1010
Ben Hutchings2c530402012-07-10 10:55:09 +00001011/**
1012 * batadv_bla_purge_claims
1013 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001014 * @primary_if: the selected primary interface, may be NULL if now is set
1015 * @now: whether the whole hash shall be wiped now
1016 *
1017 * Check when we heard last time from our own claims, and remove them in case of
1018 * a time out, or clean all claims if now is set
1019 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001020static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1021 struct batadv_hard_iface *primary_if,
1022 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001023{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001024 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001025 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001026 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001027 int i;
1028
Sven Eckelmann807736f2012-07-15 22:26:51 +02001029 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001030 if (!hash)
1031 return;
1032
1033 for (i = 0; i < hash->size; i++) {
1034 head = &hash->table[i];
1035
1036 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001037 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001038 if (now)
1039 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001040 if (!batadv_compare_eth(claim->backbone_gw->orig,
1041 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001042 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001043 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001044 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001045 continue;
1046
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001047 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001048 "bla_purge_claims(): %pM, vid %d, time out\n",
1049 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001050
1051purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001052 batadv_handle_unclaim(bat_priv, primary_if,
1053 claim->backbone_gw->orig,
1054 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001055 }
1056 rcu_read_unlock();
1057 }
1058}
1059
Ben Hutchings2c530402012-07-10 10:55:09 +00001060/**
1061 * batadv_bla_update_orig_address
1062 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001063 * @primary_if: the new selected primary_if
1064 * @oldif: the old primary interface, may be NULL
1065 *
1066 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001067 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001068void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1069 struct batadv_hard_iface *primary_if,
1070 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001071{
Marek Lindnerbae98772012-12-25 17:03:24 +08001072 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001073 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001074 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001075 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001076 int i;
1077
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001078 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001079 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1080 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001081
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001082 /* purge everything when bridge loop avoidance is turned off */
1083 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1084 oldif = NULL;
1085
Simon Wunderlich23721382012-01-22 20:00:19 +01001086 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001087 batadv_bla_purge_claims(bat_priv, NULL, 1);
1088 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001089 return;
1090 }
1091
Sven Eckelmann807736f2012-07-15 22:26:51 +02001092 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001093 if (!hash)
1094 return;
1095
1096 for (i = 0; i < hash->size; i++) {
1097 head = &hash->table[i];
1098
1099 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001100 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001101 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001102 if (!batadv_compare_eth(backbone_gw->orig,
1103 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001104 continue;
1105
1106 memcpy(backbone_gw->orig,
1107 primary_if->net_dev->dev_addr, ETH_ALEN);
1108 /* send an announce frame so others will ask for our
1109 * claims and update their tables.
1110 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001111 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001112 }
1113 rcu_read_unlock();
1114 }
1115}
1116
Simon Wunderlich23721382012-01-22 20:00:19 +01001117/* periodic work to do:
1118 * * purge structures when they are too old
1119 * * send announcements
1120 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001121static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001122{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001123 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001124 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001125 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001126 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001127 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001128 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001129 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001130 int i;
1131
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001132 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001133 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1134 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001135 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001136 if (!primary_if)
1137 goto out;
1138
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001139 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1140 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001141
1142 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1143 goto out;
1144
Sven Eckelmann807736f2012-07-15 22:26:51 +02001145 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001146 if (!hash)
1147 goto out;
1148
1149 for (i = 0; i < hash->size; i++) {
1150 head = &hash->table[i];
1151
1152 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001153 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001154 if (!batadv_compare_eth(backbone_gw->orig,
1155 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001156 continue;
1157
1158 backbone_gw->lasttime = jiffies;
1159
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001160 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001161
1162 /* request_sent is only set after creation to avoid
1163 * problems when we are not yet known as backbone gw
1164 * in the backbone.
1165 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001166 * We can reset this now after we waited some periods
1167 * to give bridge forward delays and bla group forming
1168 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001169 */
1170
1171 if (atomic_read(&backbone_gw->request_sent) == 0)
1172 continue;
1173
Simon Wunderlich28709872012-09-13 18:18:46 +02001174 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1175 continue;
1176
Simon Wunderlichd807f272012-09-09 22:27:57 +02001177 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1178 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001179 }
1180 rcu_read_unlock();
1181 }
1182out:
1183 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001184 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001185
Antonio Quartulli72414442012-12-25 13:14:37 +01001186 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1187 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001188}
1189
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001190/* The hash for claim and backbone hash receive the same key because they
1191 * are getting initialized by hash_new with the same key. Reinitializing
1192 * them with to different keys to allow nested locking without generating
1193 * lockdep warnings
1194 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001195static struct lock_class_key batadv_claim_hash_lock_class_key;
1196static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001197
Simon Wunderlich23721382012-01-22 20:00:19 +01001198/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001199int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001200{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001201 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001202 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001203 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001204 uint16_t crc;
1205 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001206
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001207 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1208
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001209 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001210
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001211 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001212 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1213 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001214 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001215 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001216 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1217 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001218 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001219 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001220 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001221 }
1222
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001223 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001224 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001225 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001226 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1227 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001228
Sven Eckelmann807736f2012-07-15 22:26:51 +02001229 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001230 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001231
Sven Eckelmann807736f2012-07-15 22:26:51 +02001232 bat_priv->bla.claim_hash = batadv_hash_new(128);
1233 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001234
Sven Eckelmann807736f2012-07-15 22:26:51 +02001235 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001236 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001237
Sven Eckelmann807736f2012-07-15 22:26:51 +02001238 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001239 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001240 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001241 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001242
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001243 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001244
Antonio Quartulli72414442012-12-25 13:14:37 +01001245 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1246
1247 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1248 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001249 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001250}
1251
Ben Hutchings2c530402012-07-10 10:55:09 +00001252/**
1253 * batadv_bla_check_bcast_duplist
1254 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001255 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001256 *
1257 * check if it is on our broadcast list. Another gateway might
1258 * have sent the same packet because it is connected to the same backbone,
1259 * so we have to remove this duplicate.
1260 *
1261 * This is performed by checking the CRC, which will tell us
1262 * with a good chance that it is the same packet. If it is furthermore
1263 * sent by another host, drop it. We allow equal packets from
1264 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001265 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001266int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001267 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001268{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001269 int i, curr, ret = 0;
1270 __be32 crc;
1271 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001272 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001273
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001274 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001275
1276 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001277 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001278
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001279 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1280
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001281 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001282 curr = (bat_priv->bla.bcast_duplist_curr + i);
1283 curr %= BATADV_DUPLIST_SIZE;
1284 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001285
1286 /* we can stop searching if the entry is too old ;
1287 * later entries will be even older
1288 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001289 if (batadv_has_timed_out(entry->entrytime,
1290 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001291 break;
1292
1293 if (entry->crc != crc)
1294 continue;
1295
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001296 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001297 continue;
1298
1299 /* this entry seems to match: same crc, not too old,
1300 * and from another gw. therefore return 1 to forbid it.
1301 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001302 ret = 1;
1303 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001304 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001305 /* not found, add a new entry (overwrite the oldest entry)
1306 * and allow it, its the first occurence.
1307 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001308 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001309 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001310 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001311 entry->crc = crc;
1312 entry->entrytime = jiffies;
1313 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001314 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001315
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001316out:
1317 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1318
1319 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001320}
1321
1322
1323
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001324/**
1325 * batadv_bla_is_backbone_gw_orig
1326 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001327 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001328 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001329 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001330 * Check if the originator is a gateway for the VLAN identified by vid.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001331 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001332 * Returns true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001333 */
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001334bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
1335 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001336{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001337 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001338 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001339 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001340 int i;
1341
1342 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001343 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001344
1345 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001346 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001347
1348 for (i = 0; i < hash->size; i++) {
1349 head = &hash->table[i];
1350
1351 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001352 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001353 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1354 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001355 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001356 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001357 }
1358 }
1359 rcu_read_unlock();
1360 }
1361
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001362 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001363}
1364
1365
Ben Hutchings2c530402012-07-10 10:55:09 +00001366/**
1367 * batadv_bla_is_backbone_gw
1368 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001369 * @orig_node: the orig_node of the frame
1370 * @hdr_size: maximum length of the frame
1371 *
1372 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1373 * if the orig_node is also a gateway on the soft interface, otherwise it
1374 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001375 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001376int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001377 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001378{
Marek Lindnerbae98772012-12-25 17:03:24 +08001379 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001380 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001381
1382 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1383 return 0;
1384
1385 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001386 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001387 return 0;
1388
Antonio Quartullic018ad32013-06-04 12:11:39 +02001389 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001390
1391 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001392 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1393 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001394 if (!backbone_gw)
1395 return 0;
1396
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001397 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001398 return 1;
1399}
1400
1401/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001402void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001403{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001404 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001405
Sven Eckelmann807736f2012-07-15 22:26:51 +02001406 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001407 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001408
Sven Eckelmann807736f2012-07-15 22:26:51 +02001409 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001410 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001411 batadv_hash_destroy(bat_priv->bla.claim_hash);
1412 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001413 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001414 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001415 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001416 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1417 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001418 }
1419 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001420 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001421}
1422
Ben Hutchings2c530402012-07-10 10:55:09 +00001423/**
1424 * batadv_bla_rx
1425 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001426 * @skb: the frame to be checked
1427 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001428 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001429 *
1430 * bla_rx avoidance checks if:
1431 * * we have to race for a claim
1432 * * if the frame is allowed on the LAN
1433 *
1434 * in these cases, the skb is further handled by this function and
1435 * returns 1, otherwise it returns 0 and the caller shall further
1436 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001437 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001438int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1439 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001440{
1441 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001442 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001443 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001444 int ret;
1445
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001446 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001447
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001448 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001449 if (!primary_if)
1450 goto handled;
1451
1452 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1453 goto allow;
1454
1455
Sven Eckelmann807736f2012-07-15 22:26:51 +02001456 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001457 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001458 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001459 goto handled;
1460
1461 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1462 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001463 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001464
1465 if (!claim) {
1466 /* possible optimization: race for a claim */
1467 /* No claim exists yet, claim it for us!
1468 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001469 batadv_handle_claim(bat_priv, primary_if,
1470 primary_if->net_dev->dev_addr,
1471 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001472 goto allow;
1473 }
1474
1475 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001476 if (batadv_compare_eth(claim->backbone_gw->orig,
1477 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001478 /* ... allow it in any case */
1479 claim->lasttime = jiffies;
1480 goto allow;
1481 }
1482
1483 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001484 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1485 /* ... drop it. the responsible gateway is in charge.
1486 *
1487 * We need to check is_bcast because with the gateway
1488 * feature, broadcasts (like DHCP requests) may be sent
1489 * using a unicast packet type.
1490 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001491 goto handled;
1492 } else {
1493 /* seems the client considers us as its best gateway.
1494 * send a claim and update the claim table
1495 * immediately.
1496 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001497 batadv_handle_claim(bat_priv, primary_if,
1498 primary_if->net_dev->dev_addr,
1499 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001500 goto allow;
1501 }
1502allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001503 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001504 ret = 0;
1505 goto out;
1506
1507handled:
1508 kfree_skb(skb);
1509 ret = 1;
1510
1511out:
1512 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001513 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001514 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001515 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001516 return ret;
1517}
1518
Ben Hutchings2c530402012-07-10 10:55:09 +00001519/**
1520 * batadv_bla_tx
1521 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001522 * @skb: the frame to be checked
1523 * @vid: the VLAN ID of the frame
1524 *
1525 * bla_tx checks if:
1526 * * a claim was received which has to be processed
1527 * * the frame is allowed on the mesh
1528 *
1529 * in these cases, the skb is further handled by this function and
1530 * returns 1, otherwise it returns 0 and the caller shall further
1531 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001532 *
1533 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001534 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001535int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1536 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001537{
1538 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001539 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001540 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001541 int ret = 0;
1542
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001543 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001544 if (!primary_if)
1545 goto out;
1546
1547 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1548 goto allow;
1549
1550 /* in VLAN case, the mac header might not be set. */
1551 skb_reset_mac_header(skb);
1552
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001553 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001554 goto handled;
1555
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001556 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001557
Sven Eckelmann807736f2012-07-15 22:26:51 +02001558 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001559 /* don't allow broadcasts while requests are in flight */
1560 if (is_multicast_ether_addr(ethhdr->h_dest))
1561 goto handled;
1562
1563 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1564 search_claim.vid = vid;
1565
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001566 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001567
1568 /* if no claim exists, allow it. */
1569 if (!claim)
1570 goto allow;
1571
1572 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001573 if (batadv_compare_eth(claim->backbone_gw->orig,
1574 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001575 /* if yes, the client has roamed and we have
1576 * to unclaim it.
1577 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001578 batadv_handle_unclaim(bat_priv, primary_if,
1579 primary_if->net_dev->dev_addr,
1580 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001581 goto allow;
1582 }
1583
1584 /* check if it is a multicast/broadcast frame */
1585 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1586 /* drop it. the responsible gateway has forwarded it into
1587 * the backbone network.
1588 */
1589 goto handled;
1590 } else {
1591 /* we must allow it. at least if we are
1592 * responsible for the DESTINATION.
1593 */
1594 goto allow;
1595 }
1596allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001597 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001598 ret = 0;
1599 goto out;
1600handled:
1601 ret = 1;
1602out:
1603 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001604 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001605 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001606 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001607 return ret;
1608}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001609
Sven Eckelmann08adf152012-05-12 13:38:47 +02001610int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001611{
1612 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001613 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001614 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001615 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001616 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001617 struct hlist_head *head;
1618 uint32_t i;
1619 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001620 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001621
Marek Lindner30da63a2012-08-03 17:15:46 +02001622 primary_if = batadv_seq_print_text_primary_if_get(seq);
1623 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001624 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001625
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001626 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001627 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001628 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001629 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001630 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001631 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001632 "Client", "VID", "Originator", "CRC");
1633 for (i = 0; i < hash->size; i++) {
1634 head = &hash->table[i];
1635
1636 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001637 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001638 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1639 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001640 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001641 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642 claim->backbone_gw->orig,
1643 (is_own ? 'x' : ' '),
1644 claim->backbone_gw->crc);
1645 }
1646 rcu_read_unlock();
1647 }
1648out:
1649 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001650 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001651 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001652}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001653
1654int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1655{
1656 struct net_device *net_dev = (struct net_device *)seq->private;
1657 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001658 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001659 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001660 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001661 struct hlist_head *head;
1662 int secs, msecs;
1663 uint32_t i;
1664 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001665 uint8_t *primary_addr;
1666
Marek Lindner30da63a2012-08-03 17:15:46 +02001667 primary_if = batadv_seq_print_text_primary_if_get(seq);
1668 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001669 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001670
1671 primary_addr = primary_if->net_dev->dev_addr;
1672 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001673 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001674 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001675 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001676 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001677 "Originator", "VID", "last seen", "CRC");
1678 for (i = 0; i < hash->size; i++) {
1679 head = &hash->table[i];
1680
1681 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001682 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001683 msecs = jiffies_to_msecs(jiffies -
1684 backbone_gw->lasttime);
1685 secs = msecs / 1000;
1686 msecs = msecs % 1000;
1687
1688 is_own = batadv_compare_eth(backbone_gw->orig,
1689 primary_addr);
1690 if (is_own)
1691 continue;
1692
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001693 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001694 backbone_gw->orig,
1695 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001696 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001697 }
1698 rcu_read_unlock();
1699 }
1700out:
1701 if (primary_if)
1702 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001703 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001704}