blob: 0f0ca433ce3c15a1947e43731ca9718d1dfde25e [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
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100194 ether_addr_copy(search_entry.orig, addr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100195 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
Martin Hundebølle3357182014-07-15 09:41:06 +0200255 * @mac: the mac address to be announced within the claim
Simon Wunderlich23721382012-01-22 20:00:19 +0100256 * @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 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100308 ether_addr_copy(ethhdr->h_source, mac);
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 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100317 ether_addr_copy(hw_src, mac);
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 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100326 ether_addr_copy(hw_src, mac);
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 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100336 ether_addr_copy(hw_src, mac);
337 ether_addr_copy(ethhdr->h_dest, mac);
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
Martin Hundebølle3357182014-07-15 09:41:06 +0200367 * @own_backbone: set if the requested backbone is local
Simon Wunderlich23721382012-01-22 20:00:19 +0100368 *
369 * searches for the backbone gw or creates a new one if it could not
370 * be found.
371 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800372static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200373batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200374 unsigned short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100375{
Marek Lindnerbae98772012-12-25 17:03:24 +0800376 struct batadv_bla_backbone_gw *entry;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200377 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100378 int hash_added;
379
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200380 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100381
382 if (entry)
383 return entry;
384
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200385 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200386 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200387 orig, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100388
389 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
390 if (!entry)
391 return NULL;
392
393 entry->vid = vid;
394 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200395 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100396 entry->bat_priv = bat_priv;
397 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200398 atomic_set(&entry->wait_periods, 0);
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100399 ether_addr_copy(entry->orig, orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100400
401 /* one for the hash, one for returning */
402 atomic_set(&entry->refcount, 2);
403
Sven Eckelmann807736f2012-07-15 22:26:51 +0200404 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200405 batadv_compare_backbone_gw,
406 batadv_choose_backbone_gw, entry,
407 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100408
409 if (unlikely(hash_added != 0)) {
410 /* hash failed, free the structure */
411 kfree(entry);
412 return NULL;
413 }
414
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200415 /* this is a gateway now, remove any TT entry on this VLAN */
Sven Eckelmannda641192012-05-12 13:48:56 +0200416 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100417 if (orig_node) {
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200418 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200419 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200420 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100421 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200422
Simon Wunderlichd807f272012-09-09 22:27:57 +0200423 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200424 batadv_bla_send_announce(bat_priv, entry);
425
Simon Wunderlichd807f272012-09-09 22:27:57 +0200426 /* this will be decreased in the worker thread */
427 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200428 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200429 atomic_inc(&bat_priv->bla.num_requests);
430 }
431
Simon Wunderlich23721382012-01-22 20:00:19 +0100432 return entry;
433}
434
435/* update or add the own backbone gw to make sure we announce
436 * where we receive other backbone gws
437 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200438static void
439batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
440 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200441 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100442{
Marek Lindnerbae98772012-12-25 17:03:24 +0800443 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100444
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200445 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
446 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200447 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100448 if (unlikely(!backbone_gw))
449 return;
450
451 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200452 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100453}
454
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100455/**
456 * batadv_bla_answer_request - answer a bla request by sending own claims
457 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200458 * @primary_if: interface where the request came on
Simon Wunderlich23721382012-01-22 20:00:19 +0100459 * @vid: the vid where the request came on
460 *
461 * Repeat all of our own claims, and finally send an ANNOUNCE frame
462 * to allow the requester another check if the CRC is correct now.
463 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200464static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
465 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200466 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100467{
Simon Wunderlich23721382012-01-22 20:00:19 +0100468 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200469 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800470 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800471 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100472 int i;
473
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200474 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200475 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100476
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200477 backbone_gw = batadv_backbone_hash_find(bat_priv,
478 primary_if->net_dev->dev_addr,
479 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100480 if (!backbone_gw)
481 return;
482
Sven Eckelmann807736f2012-07-15 22:26:51 +0200483 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100484 for (i = 0; i < hash->size; i++) {
485 head = &hash->table[i];
486
487 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800488 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100489 /* only own claims are interesting */
490 if (claim->backbone_gw != backbone_gw)
491 continue;
492
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200493 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200494 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100495 }
496 rcu_read_unlock();
497 }
498
499 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200500 batadv_bla_send_announce(bat_priv, backbone_gw);
501 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100502}
503
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100504/**
505 * batadv_bla_send_request - send a request to repeat claims
506 * @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100507 *
508 * When the crc is wrong, ask the backbone gateway for a full table update.
509 * After the request, it will repeat all of his own claims and finally
510 * send an announcement claim with which we can check again.
511 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800512static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100513{
514 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200515 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100516
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200517 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
518 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100519
520 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200521 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200522 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100523
524 /* no local broadcasts should be sent or received, for now. */
525 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200526 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100527 atomic_set(&backbone_gw->request_sent, 1);
528 }
529}
530
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100531/**
532 * batadv_bla_send_announce
533 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100534 * @backbone_gw: our backbone gateway which should be announced
535 *
536 * This function sends an announcement. It is called from multiple
537 * places.
538 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200539static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800540 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100541{
542 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100543 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100544
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200545 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100546 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100547 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100548
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200549 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200550 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100551}
552
Ben Hutchings2c530402012-07-10 10:55:09 +0000553/**
554 * batadv_bla_add_claim - Adds a claim in the claim hash
555 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100556 * @mac: the mac address of the claim
557 * @vid: the VLAN ID of the frame
558 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100559 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200560static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200561 const uint8_t *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800562 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100563{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800564 struct batadv_bla_claim *claim;
565 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100566 int hash_added;
567
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100568 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100569 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200570 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100571
572 /* create a new claim entry if it does not exist yet. */
573 if (!claim) {
574 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
575 if (!claim)
576 return;
577
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100578 ether_addr_copy(claim->addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100579 claim->vid = vid;
580 claim->lasttime = jiffies;
581 claim->backbone_gw = backbone_gw;
582
583 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200584 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200585 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200586 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200587 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200588 batadv_compare_claim,
589 batadv_choose_claim, claim,
590 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100591
592 if (unlikely(hash_added != 0)) {
593 /* only local changes happened. */
594 kfree(claim);
595 return;
596 }
597 } else {
598 claim->lasttime = jiffies;
599 if (claim->backbone_gw == backbone_gw)
600 /* no need to register a new backbone */
601 goto claim_free_ref;
602
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200603 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200604 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200605 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100606
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200607 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200608 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100609 }
610 /* set (new) backbone gw */
611 atomic_inc(&backbone_gw->refcount);
612 claim->backbone_gw = backbone_gw;
613
614 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
615 backbone_gw->lasttime = jiffies;
616
617claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200618 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100619}
620
621/* Delete a claim from the claim hash which has the
622 * given mac address and vid.
623 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200624static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200625 const uint8_t *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100626{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800627 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100628
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100629 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100630 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200631 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100632 if (!claim)
633 return;
634
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200635 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200636 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100637
Sven Eckelmann807736f2012-07-15 22:26:51 +0200638 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200639 batadv_choose_claim, claim);
640 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100641
642 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
643
644 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200645 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100646}
647
648/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200649static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200650 uint8_t *an_addr, uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200651 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100652{
Marek Lindnerbae98772012-12-25 17:03:24 +0800653 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100654 uint16_t crc;
655
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200656 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100657 return 0;
658
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200659 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
660 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100661
662 if (unlikely(!backbone_gw))
663 return 1;
664
665
666 /* handle as ANNOUNCE frame */
667 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100668 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100669
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200670 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100671 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200672 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100673
674 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200675 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100676 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200677 backbone_gw->orig,
678 BATADV_PRINT_VID(backbone_gw->vid),
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200679 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100680
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200681 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100682 } else {
683 /* if we have sent a request and the crc was OK,
684 * we can allow traffic again.
685 */
686 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200687 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100688 atomic_set(&backbone_gw->request_sent, 0);
689 }
690 }
691
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200692 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100693 return 1;
694}
695
696/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200697static int batadv_handle_request(struct batadv_priv *bat_priv,
698 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200699 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200700 struct ethhdr *ethhdr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100701{
702 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200703 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100704 return 0;
705
706 /* sanity check, this should not happen on a normal switch,
707 * we ignore it in this case.
708 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200709 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100710 return 1;
711
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200712 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200713 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200714 BATADV_PRINT_VID(vid), ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100715
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200716 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100717 return 1;
718}
719
720/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200721static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
722 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200723 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200724 uint8_t *claim_addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100725{
Marek Lindnerbae98772012-12-25 17:03:24 +0800726 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100727
728 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200729 if (primary_if && batadv_compare_eth(backbone_addr,
730 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200731 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200732 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100733
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200734 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100735
736 if (!backbone_gw)
737 return 1;
738
739 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200740 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200741 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200742 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100743
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200744 batadv_bla_del_claim(bat_priv, claim_addr, vid);
745 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100746 return 1;
747}
748
749/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200750static int batadv_handle_claim(struct batadv_priv *bat_priv,
751 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200752 uint8_t *backbone_addr, uint8_t *claim_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200753 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100754{
Marek Lindnerbae98772012-12-25 17:03:24 +0800755 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100756
757 /* register the gateway if not yet available, and add the claim. */
758
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200759 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
760 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100761
762 if (unlikely(!backbone_gw))
763 return 1;
764
765 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200766 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200767 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200768 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200769 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100770
771 /* TODO: we could call something like tt_local_del() here. */
772
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200773 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100774 return 1;
775}
776
Ben Hutchings2c530402012-07-10 10:55:09 +0000777/**
778 * batadv_check_claim_group
779 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200780 * @primary_if: the primary interface of this batman interface
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100781 * @hw_src: the Hardware source in the ARP Header
782 * @hw_dst: the Hardware destination in the ARP Header
783 * @ethhdr: pointer to the Ethernet header of the claim frame
784 *
785 * checks if it is a claim packet and if its on the same group.
786 * This function also applies the group ID of the sender
787 * if it is in the same mesh.
788 *
789 * returns:
790 * 2 - if it is a claim packet and on the same group
791 * 1 - if is a claim packet from another group
792 * 0 - if it is not a claim packet
793 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200794static int batadv_check_claim_group(struct batadv_priv *bat_priv,
795 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200796 uint8_t *hw_src, uint8_t *hw_dst,
797 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100798{
799 uint8_t *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200800 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200801 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100802
Sven Eckelmann96412692012-06-05 22:31:30 +0200803 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200804 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100805
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100806 /* if announcement packet, use the source,
807 * otherwise assume it is in the hw_src
808 */
809 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200810 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100811 backbone_addr = hw_src;
812 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200813 case BATADV_CLAIM_TYPE_REQUEST:
814 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200815 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100816 backbone_addr = ethhdr->h_source;
817 break;
818 default:
819 return 0;
820 }
821
822 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200823 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100824 return 0;
825
826 /* if its already the same group, it is fine. */
827 if (bla_dst->group == bla_dst_own->group)
828 return 2;
829
830 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200831 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100832
833 /* dont accept claims from gateways which are not in
834 * the same mesh or group.
835 */
836 if (!orig_node)
837 return 1;
838
839 /* if our mesh friends mac is bigger, use it for ourselves. */
840 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200841 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100842 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200843 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100844 bla_dst_own->group = bla_dst->group;
845 }
846
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200847 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100848
849 return 2;
850}
851
852
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100853/**
854 * batadv_bla_process_claim
855 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200856 * @primary_if: the primary hard interface of this batman soft interface
Simon Wunderlich23721382012-01-22 20:00:19 +0100857 * @skb: the frame to be checked
858 *
859 * Check if this is a claim frame, and process it accordingly.
860 *
861 * returns 1 if it was a claim frame, otherwise return 0 to
862 * tell the callee that it can use the frame on its own.
863 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200864static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
865 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200866 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100867{
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200868 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200869 uint8_t *hw_src, *hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200870 struct vlan_hdr *vhdr, vhdr_buf;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200871 struct ethhdr *ethhdr;
872 struct arphdr *arphdr;
873 unsigned short vid;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200874 int vlan_depth = 0;
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 Wunderlichd46b6bf2014-06-23 15:55:36 +0200885 /* Traverse the VLAN/Ethertypes.
886 *
887 * At this point it is known that the first protocol is a VLAN
888 * header, so start checking at the encapsulated protocol.
889 *
890 * The depth of the VLAN headers is recorded to drop BLA claim
891 * frames encapsulated into multiple VLAN headers (QinQ).
892 */
893 do {
894 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
895 &vhdr_buf);
896 if (!vhdr)
897 return 0;
898
899 proto = vhdr->h_vlan_encapsulated_proto;
900 headlen += VLAN_HLEN;
901 vlan_depth++;
902 } while (proto == htons(ETH_P_8021Q));
Simon Wunderlich23721382012-01-22 20:00:19 +0100903 }
904
Antonio Quartulli293e9332013-05-19 12:55:16 +0200905 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100906 return 0; /* not a claim frame */
907
908 /* this must be a ARP frame. check if it is a claim. */
909
910 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
911 return 0;
912
913 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200914 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100915 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
916
917 /* Check whether the ARP frame carries a valid
918 * IP information
919 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100920 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
921 return 0;
922 if (arphdr->ar_pro != htons(ETH_P_IP))
923 return 0;
924 if (arphdr->ar_hln != ETH_ALEN)
925 return 0;
926 if (arphdr->ar_pln != 4)
927 return 0;
928
929 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
930 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200931 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200932 bla_dst_own = &bat_priv->bla.claim_dest;
933
934 /* check if it is a claim frame in general */
935 if (memcmp(bla_dst->magic, bla_dst_own->magic,
936 sizeof(bla_dst->magic)) != 0)
937 return 0;
938
939 /* check if there is a claim frame encapsulated deeper in (QinQ) and
940 * drop that, as this is not supported by BLA but should also not be
941 * sent via the mesh.
942 */
943 if (vlan_depth > 1)
944 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100945
946 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200947 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
948 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100949 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200950 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200951 "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 +0200952 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
953 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100954
955 if (ret < 2)
956 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100957
958 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200959 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100960
961 /* check for the different types of claim frames ... */
962 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200963 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200964 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
965 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100966 return 1;
967 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200968 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200969 if (batadv_handle_unclaim(bat_priv, primary_if,
970 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100971 return 1;
972 break;
973
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200974 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200975 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
976 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100977 return 1;
978 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200979 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200980 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
981 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100982 return 1;
983 break;
984 }
985
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200986 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200987 "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 +0200988 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100989 return 1;
990}
991
992/* Check when we last heard from other nodes, and remove them in case of
993 * a time out, or clean all backbone gws if now is set.
994 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200995static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100996{
Marek Lindnerbae98772012-12-25 17:03:24 +0800997 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800998 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100999 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001000 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001001 spinlock_t *list_lock; /* protects write access to the hash lists */
1002 int i;
1003
Sven Eckelmann807736f2012-07-15 22:26:51 +02001004 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001005 if (!hash)
1006 return;
1007
1008 for (i = 0; i < hash->size; i++) {
1009 head = &hash->table[i];
1010 list_lock = &hash->list_locks[i];
1011
1012 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08001013 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +01001014 head, hash_entry) {
1015 if (now)
1016 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001017 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001018 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001019 continue;
1020
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001021 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001022 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1023 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +01001024
1025purge_now:
1026 /* don't wait for the pending request anymore */
1027 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +02001028 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +01001029
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001030 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001031
Sasha Levinb67bfe02013-02-27 17:06:00 -08001032 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001033 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001034 }
1035 spin_unlock_bh(list_lock);
1036 }
1037}
1038
Ben Hutchings2c530402012-07-10 10:55:09 +00001039/**
1040 * batadv_bla_purge_claims
1041 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001042 * @primary_if: the selected primary interface, may be NULL if now is set
1043 * @now: whether the whole hash shall be wiped now
1044 *
1045 * Check when we heard last time from our own claims, and remove them in case of
1046 * a time out, or clean all claims if now is set
1047 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001048static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1049 struct batadv_hard_iface *primary_if,
1050 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001051{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001052 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001053 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001054 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001055 int i;
1056
Sven Eckelmann807736f2012-07-15 22:26:51 +02001057 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001058 if (!hash)
1059 return;
1060
1061 for (i = 0; i < hash->size; i++) {
1062 head = &hash->table[i];
1063
1064 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001065 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001066 if (now)
1067 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001068 if (!batadv_compare_eth(claim->backbone_gw->orig,
1069 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001070 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001071 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001072 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001073 continue;
1074
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001075 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001076 "bla_purge_claims(): %pM, vid %d, time out\n",
1077 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001078
1079purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001080 batadv_handle_unclaim(bat_priv, primary_if,
1081 claim->backbone_gw->orig,
1082 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001083 }
1084 rcu_read_unlock();
1085 }
1086}
1087
Ben Hutchings2c530402012-07-10 10:55:09 +00001088/**
1089 * batadv_bla_update_orig_address
1090 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001091 * @primary_if: the new selected primary_if
1092 * @oldif: the old primary interface, may be NULL
1093 *
1094 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001095 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001096void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1097 struct batadv_hard_iface *primary_if,
1098 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001099{
Marek Lindnerbae98772012-12-25 17:03:24 +08001100 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001101 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001102 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001103 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001104 int i;
1105
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001106 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001107 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1108 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001109
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001110 /* purge everything when bridge loop avoidance is turned off */
1111 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1112 oldif = NULL;
1113
Simon Wunderlich23721382012-01-22 20:00:19 +01001114 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001115 batadv_bla_purge_claims(bat_priv, NULL, 1);
1116 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001117 return;
1118 }
1119
Sven Eckelmann807736f2012-07-15 22:26:51 +02001120 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001121 if (!hash)
1122 return;
1123
1124 for (i = 0; i < hash->size; i++) {
1125 head = &hash->table[i];
1126
1127 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001128 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001129 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001130 if (!batadv_compare_eth(backbone_gw->orig,
1131 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001132 continue;
1133
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001134 ether_addr_copy(backbone_gw->orig,
1135 primary_if->net_dev->dev_addr);
Simon Wunderlich23721382012-01-22 20:00:19 +01001136 /* send an announce frame so others will ask for our
1137 * claims and update their tables.
1138 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001139 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001140 }
1141 rcu_read_unlock();
1142 }
1143}
1144
Simon Wunderlich23721382012-01-22 20:00:19 +01001145/* periodic work to do:
1146 * * purge structures when they are too old
1147 * * send announcements
1148 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001149static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001150{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001151 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001152 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001153 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001154 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001155 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001156 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001157 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001158 int i;
1159
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001160 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001161 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1162 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001163 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001164 if (!primary_if)
1165 goto out;
1166
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001167 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1168 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001169
1170 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1171 goto out;
1172
Sven Eckelmann807736f2012-07-15 22:26:51 +02001173 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001174 if (!hash)
1175 goto out;
1176
1177 for (i = 0; i < hash->size; i++) {
1178 head = &hash->table[i];
1179
1180 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001181 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001182 if (!batadv_compare_eth(backbone_gw->orig,
1183 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001184 continue;
1185
1186 backbone_gw->lasttime = jiffies;
1187
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001188 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001189
1190 /* request_sent is only set after creation to avoid
1191 * problems when we are not yet known as backbone gw
1192 * in the backbone.
1193 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001194 * We can reset this now after we waited some periods
1195 * to give bridge forward delays and bla group forming
1196 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001197 */
1198
1199 if (atomic_read(&backbone_gw->request_sent) == 0)
1200 continue;
1201
Simon Wunderlich28709872012-09-13 18:18:46 +02001202 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1203 continue;
1204
Simon Wunderlichd807f272012-09-09 22:27:57 +02001205 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1206 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001207 }
1208 rcu_read_unlock();
1209 }
1210out:
1211 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001212 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001213
Antonio Quartulli72414442012-12-25 13:14:37 +01001214 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1215 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001216}
1217
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001218/* The hash for claim and backbone hash receive the same key because they
1219 * are getting initialized by hash_new with the same key. Reinitializing
1220 * them with to different keys to allow nested locking without generating
1221 * lockdep warnings
1222 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001223static struct lock_class_key batadv_claim_hash_lock_class_key;
1224static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001225
Simon Wunderlich23721382012-01-22 20:00:19 +01001226/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001227int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001228{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001229 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001230 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001231 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001232 uint16_t crc;
1233 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001234
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001235 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1236
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001237 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001238
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001239 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001240 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1241 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001242 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001243 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001244 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1245 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001246 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001247 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001248 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001249 }
1250
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001251 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001252 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001253 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001254 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1255 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001256
Sven Eckelmann807736f2012-07-15 22:26:51 +02001257 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001258 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001259
Sven Eckelmann807736f2012-07-15 22:26:51 +02001260 bat_priv->bla.claim_hash = batadv_hash_new(128);
1261 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001262
Sven Eckelmann807736f2012-07-15 22:26:51 +02001263 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001264 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001265
Sven Eckelmann807736f2012-07-15 22:26:51 +02001266 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001267 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001268 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001269 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001270
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001271 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001272
Antonio Quartulli72414442012-12-25 13:14:37 +01001273 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1274
1275 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1276 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001277 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001278}
1279
Ben Hutchings2c530402012-07-10 10:55:09 +00001280/**
1281 * batadv_bla_check_bcast_duplist
1282 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001283 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001284 *
1285 * check if it is on our broadcast list. Another gateway might
1286 * have sent the same packet because it is connected to the same backbone,
1287 * so we have to remove this duplicate.
1288 *
1289 * This is performed by checking the CRC, which will tell us
1290 * with a good chance that it is the same packet. If it is furthermore
1291 * sent by another host, drop it. We allow equal packets from
1292 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001293 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001294int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001295 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001296{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001297 int i, curr, ret = 0;
1298 __be32 crc;
1299 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001300 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001301
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001302 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001303
1304 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001305 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001306
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001307 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1308
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001309 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001310 curr = (bat_priv->bla.bcast_duplist_curr + i);
1311 curr %= BATADV_DUPLIST_SIZE;
1312 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001313
1314 /* we can stop searching if the entry is too old ;
1315 * later entries will be even older
1316 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001317 if (batadv_has_timed_out(entry->entrytime,
1318 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001319 break;
1320
1321 if (entry->crc != crc)
1322 continue;
1323
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001324 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001325 continue;
1326
1327 /* this entry seems to match: same crc, not too old,
1328 * and from another gw. therefore return 1 to forbid it.
1329 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001330 ret = 1;
1331 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001332 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001333 /* not found, add a new entry (overwrite the oldest entry)
1334 * and allow it, its the first occurence.
1335 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001336 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001337 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001338 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001339 entry->crc = crc;
1340 entry->entrytime = jiffies;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001341 ether_addr_copy(entry->orig, bcast_packet->orig);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001342 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001343
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001344out:
1345 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1346
1347 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001348}
1349
1350
1351
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001352/**
1353 * batadv_bla_is_backbone_gw_orig
1354 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001355 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001356 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001357 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001358 * Check if the originator is a gateway for the VLAN identified by vid.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001359 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001360 * Returns true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001361 */
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001362bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
1363 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001364{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001365 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001366 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001367 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001368 int i;
1369
1370 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001371 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001372
1373 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001374 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001375
1376 for (i = 0; i < hash->size; i++) {
1377 head = &hash->table[i];
1378
1379 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001380 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001381 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1382 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001383 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001384 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001385 }
1386 }
1387 rcu_read_unlock();
1388 }
1389
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001390 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001391}
1392
1393
Ben Hutchings2c530402012-07-10 10:55:09 +00001394/**
1395 * batadv_bla_is_backbone_gw
1396 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001397 * @orig_node: the orig_node of the frame
1398 * @hdr_size: maximum length of the frame
1399 *
1400 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1401 * if the orig_node is also a gateway on the soft interface, otherwise it
1402 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001403 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001404int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001405 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001406{
Marek Lindnerbae98772012-12-25 17:03:24 +08001407 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001408 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001409
1410 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1411 return 0;
1412
1413 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001414 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001415 return 0;
1416
Antonio Quartullic018ad32013-06-04 12:11:39 +02001417 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001418
1419 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001420 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1421 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001422 if (!backbone_gw)
1423 return 0;
1424
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001425 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001426 return 1;
1427}
1428
1429/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001430void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001431{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001432 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001433
Sven Eckelmann807736f2012-07-15 22:26:51 +02001434 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001435 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001436
Sven Eckelmann807736f2012-07-15 22:26:51 +02001437 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001438 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001439 batadv_hash_destroy(bat_priv->bla.claim_hash);
1440 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001441 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001442 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001443 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001444 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1445 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001446 }
1447 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001448 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001449}
1450
Ben Hutchings2c530402012-07-10 10:55:09 +00001451/**
1452 * batadv_bla_rx
1453 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001454 * @skb: the frame to be checked
1455 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001456 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001457 *
1458 * bla_rx avoidance checks if:
1459 * * we have to race for a claim
1460 * * if the frame is allowed on the LAN
1461 *
1462 * in these cases, the skb is further handled by this function and
1463 * returns 1, otherwise it returns 0 and the caller shall further
1464 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001465 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001466int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1467 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001468{
1469 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001470 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001471 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001472 int ret;
1473
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001474 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001475
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001476 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001477 if (!primary_if)
1478 goto handled;
1479
1480 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1481 goto allow;
1482
1483
Sven Eckelmann807736f2012-07-15 22:26:51 +02001484 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001485 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001486 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001487 goto handled;
1488
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001489 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001490 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001491 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001492
1493 if (!claim) {
1494 /* possible optimization: race for a claim */
1495 /* No claim exists yet, claim it for us!
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 }
1502
1503 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001504 if (batadv_compare_eth(claim->backbone_gw->orig,
1505 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001506 /* ... allow it in any case */
1507 claim->lasttime = jiffies;
1508 goto allow;
1509 }
1510
1511 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001512 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1513 /* ... drop it. the responsible gateway is in charge.
1514 *
1515 * We need to check is_bcast because with the gateway
1516 * feature, broadcasts (like DHCP requests) may be sent
1517 * using a unicast packet type.
1518 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001519 goto handled;
1520 } else {
1521 /* seems the client considers us as its best gateway.
1522 * send a claim and update the claim table
1523 * immediately.
1524 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001525 batadv_handle_claim(bat_priv, primary_if,
1526 primary_if->net_dev->dev_addr,
1527 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001528 goto allow;
1529 }
1530allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001531 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001532 ret = 0;
1533 goto out;
1534
1535handled:
1536 kfree_skb(skb);
1537 ret = 1;
1538
1539out:
1540 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001541 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001542 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001543 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001544 return ret;
1545}
1546
Ben Hutchings2c530402012-07-10 10:55:09 +00001547/**
1548 * batadv_bla_tx
1549 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001550 * @skb: the frame to be checked
1551 * @vid: the VLAN ID of the frame
1552 *
1553 * bla_tx checks if:
1554 * * a claim was received which has to be processed
1555 * * the frame is allowed on the mesh
1556 *
1557 * in these cases, the skb is further handled by this function and
1558 * returns 1, otherwise it returns 0 and the caller shall further
1559 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001560 *
1561 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001562 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001563int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1564 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001565{
1566 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001567 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001568 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001569 int ret = 0;
1570
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001571 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001572 if (!primary_if)
1573 goto out;
1574
1575 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1576 goto allow;
1577
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001578 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001579 goto handled;
1580
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001581 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001582
Sven Eckelmann807736f2012-07-15 22:26:51 +02001583 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001584 /* don't allow broadcasts while requests are in flight */
1585 if (is_multicast_ether_addr(ethhdr->h_dest))
1586 goto handled;
1587
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001588 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001589 search_claim.vid = vid;
1590
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001591 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001592
1593 /* if no claim exists, allow it. */
1594 if (!claim)
1595 goto allow;
1596
1597 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001598 if (batadv_compare_eth(claim->backbone_gw->orig,
1599 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001600 /* if yes, the client has roamed and we have
1601 * to unclaim it.
1602 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001603 batadv_handle_unclaim(bat_priv, primary_if,
1604 primary_if->net_dev->dev_addr,
1605 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001606 goto allow;
1607 }
1608
1609 /* check if it is a multicast/broadcast frame */
1610 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1611 /* drop it. the responsible gateway has forwarded it into
1612 * the backbone network.
1613 */
1614 goto handled;
1615 } else {
1616 /* we must allow it. at least if we are
1617 * responsible for the DESTINATION.
1618 */
1619 goto allow;
1620 }
1621allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001622 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001623 ret = 0;
1624 goto out;
1625handled:
1626 ret = 1;
1627out:
1628 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001629 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001630 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001631 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001632 return ret;
1633}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001634
Sven Eckelmann08adf152012-05-12 13:38:47 +02001635int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001636{
1637 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001638 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001639 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001640 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001641 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642 struct hlist_head *head;
1643 uint32_t i;
1644 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001645 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001646
Marek Lindner30da63a2012-08-03 17:15:46 +02001647 primary_if = batadv_seq_print_text_primary_if_get(seq);
1648 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001649 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001650
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001651 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001652 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001653 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001654 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001655 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001656 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001657 "Client", "VID", "Originator", "CRC");
1658 for (i = 0; i < hash->size; i++) {
1659 head = &hash->table[i];
1660
1661 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001662 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001663 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1664 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001665 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001666 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001667 claim->backbone_gw->orig,
1668 (is_own ? 'x' : ' '),
1669 claim->backbone_gw->crc);
1670 }
1671 rcu_read_unlock();
1672 }
1673out:
1674 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001675 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001676 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001677}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001678
1679int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1680{
1681 struct net_device *net_dev = (struct net_device *)seq->private;
1682 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001683 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001684 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001685 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001686 struct hlist_head *head;
1687 int secs, msecs;
1688 uint32_t i;
1689 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001690 uint8_t *primary_addr;
1691
Marek Lindner30da63a2012-08-03 17:15:46 +02001692 primary_if = batadv_seq_print_text_primary_if_get(seq);
1693 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001694 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001695
1696 primary_addr = primary_if->net_dev->dev_addr;
1697 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001698 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001699 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001700 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001701 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001702 "Originator", "VID", "last seen", "CRC");
1703 for (i = 0; i < hash->size; i++) {
1704 head = &hash->table[i];
1705
1706 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001707 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001708 msecs = jiffies_to_msecs(jiffies -
1709 backbone_gw->lasttime);
1710 secs = msecs / 1000;
1711 msecs = msecs % 1000;
1712
1713 is_own = batadv_compare_eth(backbone_gw->orig,
1714 primary_addr);
1715 if (is_own)
1716 continue;
1717
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001718 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001719 backbone_gw->orig,
1720 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001721 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001722 }
1723 rcu_read_unlock();
1724 }
1725out:
1726 if (primary_if)
1727 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001728 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001729}