blob: ac4b96eccadeb2b055de46fcf48a7aa8b6da1350 [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
Simon Wunderlich23721382012-01-22 20:00:19 +010072/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020073static int batadv_compare_backbone_gw(const struct hlist_node *node,
74 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010075{
Marek Lindnerbae98772012-12-25 17:03:24 +080076 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010077 hash_entry);
Marek Lindnerbae98772012-12-25 17:03:24 +080078 const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010079
Simon Wunderlichc76d1522012-10-15 22:38:04 +020080 if (!batadv_compare_eth(gw1->orig, gw2->orig))
81 return 0;
82
83 if (gw1->vid != gw2->vid)
84 return 0;
85
86 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +010087}
88
89/* compares address and vid of two claims */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020090static int batadv_compare_claim(const struct hlist_node *node,
91 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010092{
Marek Lindner712bbfe42012-12-25 17:03:25 +080093 const void *data1 = container_of(node, struct batadv_bla_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +010094 hash_entry);
Marek Lindner712bbfe42012-12-25 17:03:25 +080095 const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010096
Simon Wunderlichc76d1522012-10-15 22:38:04 +020097 if (!batadv_compare_eth(cl1->addr, cl2->addr))
98 return 0;
99
100 if (cl1->vid != cl2->vid)
101 return 0;
102
103 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100104}
105
106/* free a backbone gw */
Marek Lindnerbae98772012-12-25 17:03:24 +0800107static void
108batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100109{
110 if (atomic_dec_and_test(&backbone_gw->refcount))
111 kfree_rcu(backbone_gw, rcu);
112}
113
114/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200115static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100116{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800117 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100118
Marek Lindner712bbfe42012-12-25 17:03:25 +0800119 claim = container_of(rcu, struct batadv_bla_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100120
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200121 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100122 kfree(claim);
123}
124
125/* free a claim, call claim_free_rcu if its the last reference */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800126static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100127{
128 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200129 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100130}
131
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100132/**
133 * batadv_claim_hash_find
134 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100135 * @data: search data (may be local/static data)
136 *
137 * looks for a claim in the hash, and returns it if found
138 * or NULL otherwise.
139 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800140static struct batadv_bla_claim
141*batadv_claim_hash_find(struct batadv_priv *bat_priv,
142 struct batadv_bla_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100143{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200144 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100145 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800146 struct batadv_bla_claim *claim;
147 struct batadv_bla_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100148 int index;
149
150 if (!hash)
151 return NULL;
152
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200153 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100154 head = &hash->table[index];
155
156 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800157 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200158 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100159 continue;
160
161 if (!atomic_inc_not_zero(&claim->refcount))
162 continue;
163
164 claim_tmp = claim;
165 break;
166 }
167 rcu_read_unlock();
168
169 return claim_tmp;
170}
171
Ben Hutchings2c530402012-07-10 10:55:09 +0000172/**
173 * batadv_backbone_hash_find - looks for a claim in the hash
174 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100175 * @addr: the address of the originator
176 * @vid: the VLAN ID
177 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000178 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100179 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800180static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200181batadv_backbone_hash_find(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200182 uint8_t *addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100183{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200184 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100185 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +0800186 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
187 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100188 int index;
189
190 if (!hash)
191 return NULL;
192
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100193 ether_addr_copy(search_entry.orig, addr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100194 search_entry.vid = vid;
195
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200196 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100197 head = &hash->table[index];
198
199 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800200 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200201 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
202 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100203 continue;
204
205 if (!atomic_inc_not_zero(&backbone_gw->refcount))
206 continue;
207
208 backbone_gw_tmp = backbone_gw;
209 break;
210 }
211 rcu_read_unlock();
212
213 return backbone_gw_tmp;
214}
215
216/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200217static void
Marek Lindnerbae98772012-12-25 17:03:24 +0800218batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100219{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200220 struct batadv_hashtable *hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800221 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100222 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800223 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100224 int i;
225 spinlock_t *list_lock; /* protects write access to the hash lists */
226
Sven Eckelmann807736f2012-07-15 22:26:51 +0200227 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100228 if (!hash)
229 return;
230
231 for (i = 0; i < hash->size; i++) {
232 head = &hash->table[i];
233 list_lock = &hash->list_locks[i];
234
235 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800236 hlist_for_each_entry_safe(claim, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100237 head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100238 if (claim->backbone_gw != backbone_gw)
239 continue;
240
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200241 batadv_claim_free_ref(claim);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800242 hlist_del_rcu(&claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100243 }
244 spin_unlock_bh(list_lock);
245 }
246
Antonio Quartulli3f687852014-11-02 11:29:56 +0100247 /* all claims gone, initialize CRC */
Sven Eckelmann3964f722012-06-03 22:19:10 +0200248 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100249}
250
Ben Hutchings2c530402012-07-10 10:55:09 +0000251/**
252 * batadv_bla_send_claim - sends a claim frame according to the provided info
253 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200254 * @mac: the mac address to be announced within the claim
Simon Wunderlich23721382012-01-22 20:00:19 +0100255 * @vid: the VLAN ID
256 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100257 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200258static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200259 unsigned short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100260{
261 struct sk_buff *skb;
262 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200263 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100264 struct net_device *soft_iface;
265 uint8_t *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200266 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100267 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100268
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200269 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100270 if (!primary_if)
271 return;
272
Sven Eckelmann807736f2012-07-15 22:26:51 +0200273 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100274 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100275 local_claim_dest.type = claimtype;
276
277 soft_iface = primary_if->soft_iface;
278
279 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
280 /* IP DST: 0.0.0.0 */
281 zeroip,
282 primary_if->soft_iface,
283 /* IP SRC: 0.0.0.0 */
284 zeroip,
285 /* Ethernet DST: Broadcast */
286 NULL,
287 /* Ethernet SRC/HW SRC: originator mac */
288 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200289 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100290 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100291 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100292 */
293 (uint8_t *)&local_claim_dest);
294
295 if (!skb)
296 goto out;
297
298 ethhdr = (struct ethhdr *)skb->data;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100299 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100300
301 /* now we pretend that the client would have sent this ... */
302 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200303 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100304 /* normal claim frame
305 * set Ethernet SRC to the clients mac
306 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100307 ether_addr_copy(ethhdr->h_source, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200308 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200309 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
310 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100311 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200312 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100313 /* unclaim frame
314 * set HW SRC to the clients mac
315 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100316 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200317 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200318 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200319 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100320 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200321 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100322 /* announcement frame
323 * set HW SRC to the special mac containg the crc
324 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100325 ether_addr_copy(hw_src, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200326 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200327 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200328 ethhdr->h_source, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100329 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200330 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100331 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200332 * set HW SRC and header destination to the receiving backbone
333 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100334 */
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100335 ether_addr_copy(hw_src, mac);
336 ether_addr_copy(ethhdr->h_dest, mac);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200337 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200338 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200339 ethhdr->h_source, ethhdr->h_dest,
340 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100341 break;
Simon Wunderlich23721382012-01-22 20:00:19 +0100342 }
343
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200344 if (vid & BATADV_VLAN_HAS_TAG)
345 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
346 vid & VLAN_VID_MASK);
Simon Wunderlich23721382012-01-22 20:00:19 +0100347
348 skb_reset_mac_header(skb);
349 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200350 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
351 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
352 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100353 soft_iface->last_rx = jiffies;
354
355 netif_rx(skb);
356out:
357 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200358 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100359}
360
Ben Hutchings2c530402012-07-10 10:55:09 +0000361/**
362 * batadv_bla_get_backbone_gw
363 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100364 * @orig: the mac address of the originator
365 * @vid: the VLAN ID
Martin Hundebølle3357182014-07-15 09:41:06 +0200366 * @own_backbone: set if the requested backbone is local
Simon Wunderlich23721382012-01-22 20:00:19 +0100367 *
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);
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100398 ether_addr_copy(entry->orig, orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100399
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
Martin Hundebølle3357182014-07-15 09:41:06 +0200457 * @primary_if: interface where the request came on
Simon Wunderlich23721382012-01-22 20:00:19 +0100458 * @vid: the vid where the request came on
459 *
460 * Repeat all of our own claims, and finally send an ANNOUNCE frame
461 * to allow the requester another check if the CRC is correct now.
462 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200463static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
464 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200465 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100466{
Simon Wunderlich23721382012-01-22 20:00:19 +0100467 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200468 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800469 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800470 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100471 int i;
472
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200473 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200474 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100475
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200476 backbone_gw = batadv_backbone_hash_find(bat_priv,
477 primary_if->net_dev->dev_addr,
478 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100479 if (!backbone_gw)
480 return;
481
Sven Eckelmann807736f2012-07-15 22:26:51 +0200482 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100483 for (i = 0; i < hash->size; i++) {
484 head = &hash->table[i];
485
486 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800487 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100488 /* only own claims are interesting */
489 if (claim->backbone_gw != backbone_gw)
490 continue;
491
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200492 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200493 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100494 }
495 rcu_read_unlock();
496 }
497
498 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200499 batadv_bla_send_announce(bat_priv, backbone_gw);
500 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100501}
502
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100503/**
504 * batadv_bla_send_request - send a request to repeat claims
505 * @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100506 *
507 * When the crc is wrong, ask the backbone gateway for a full table update.
508 * After the request, it will repeat all of his own claims and finally
509 * send an announcement claim with which we can check again.
510 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800511static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100512{
513 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200514 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100515
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200516 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
517 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100518
519 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200520 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200521 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100522
523 /* no local broadcasts should be sent or received, for now. */
524 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200525 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100526 atomic_set(&backbone_gw->request_sent, 1);
527 }
528}
529
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100530/**
531 * batadv_bla_send_announce
532 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100533 * @backbone_gw: our backbone gateway which should be announced
534 *
535 * This function sends an announcement. It is called from multiple
536 * places.
537 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200538static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800539 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100540{
541 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100542 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100543
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200544 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100545 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100546 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100547
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200548 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200549 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100550}
551
Ben Hutchings2c530402012-07-10 10:55:09 +0000552/**
553 * batadv_bla_add_claim - Adds a claim in the claim hash
554 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100555 * @mac: the mac address of the claim
556 * @vid: the VLAN ID of the frame
557 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100558 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200559static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200560 const uint8_t *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800561 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100562{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800563 struct batadv_bla_claim *claim;
564 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100565 int hash_added;
566
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100567 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100568 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200569 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100570
571 /* create a new claim entry if it does not exist yet. */
572 if (!claim) {
573 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
574 if (!claim)
575 return;
576
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100577 ether_addr_copy(claim->addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100578 claim->vid = vid;
579 claim->lasttime = jiffies;
580 claim->backbone_gw = backbone_gw;
581
582 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200583 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200584 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200585 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200586 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200587 batadv_compare_claim,
588 batadv_choose_claim, claim,
589 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100590
591 if (unlikely(hash_added != 0)) {
592 /* only local changes happened. */
593 kfree(claim);
594 return;
595 }
596 } else {
597 claim->lasttime = jiffies;
598 if (claim->backbone_gw == backbone_gw)
599 /* no need to register a new backbone */
600 goto claim_free_ref;
601
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200602 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200603 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200604 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100605
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200606 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200607 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100608 }
609 /* set (new) backbone gw */
610 atomic_inc(&backbone_gw->refcount);
611 claim->backbone_gw = backbone_gw;
612
613 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
614 backbone_gw->lasttime = jiffies;
615
616claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200617 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100618}
619
620/* Delete a claim from the claim hash which has the
621 * given mac address and vid.
622 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200623static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200624 const uint8_t *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100625{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800626 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100627
Antonio Quartulli8fdd0152014-01-22 00:42:11 +0100628 ether_addr_copy(search_claim.addr, mac);
Simon Wunderlich23721382012-01-22 20:00:19 +0100629 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200630 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100631 if (!claim)
632 return;
633
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200634 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200635 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100636
Sven Eckelmann807736f2012-07-15 22:26:51 +0200637 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200638 batadv_choose_claim, claim);
639 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100640
641 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
642
643 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200644 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100645}
646
647/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200648static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200649 uint8_t *an_addr, uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200650 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100651{
Marek Lindnerbae98772012-12-25 17:03:24 +0800652 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100653 uint16_t crc;
654
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200655 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100656 return 0;
657
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200658 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
659 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100660
661 if (unlikely(!backbone_gw))
662 return 1;
663
Simon Wunderlich23721382012-01-22 20:00:19 +0100664 /* 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
Martin Hundebølle3357182014-07-15 09:41:06 +0200778 * @primary_if: the primary interface of this batman interface
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100779 * @hw_src: the Hardware source in the ARP Header
780 * @hw_dst: the Hardware destination in the ARP Header
781 * @ethhdr: pointer to the Ethernet header of the claim frame
782 *
783 * checks if it is a claim packet and if its on the same group.
784 * This function also applies the group ID of the sender
785 * if it is in the same mesh.
786 *
787 * returns:
788 * 2 - if it is a claim packet and on the same group
789 * 1 - if is a claim packet from another group
790 * 0 - if it is not a claim packet
791 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200792static int batadv_check_claim_group(struct batadv_priv *bat_priv,
793 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200794 uint8_t *hw_src, uint8_t *hw_dst,
795 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100796{
797 uint8_t *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200798 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200799 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100800
Sven Eckelmann96412692012-06-05 22:31:30 +0200801 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200802 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100803
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100804 /* if announcement packet, use the source,
805 * otherwise assume it is in the hw_src
806 */
807 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200808 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100809 backbone_addr = hw_src;
810 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200811 case BATADV_CLAIM_TYPE_REQUEST:
812 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200813 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100814 backbone_addr = ethhdr->h_source;
815 break;
816 default:
817 return 0;
818 }
819
820 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200821 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100822 return 0;
823
824 /* if its already the same group, it is fine. */
825 if (bla_dst->group == bla_dst_own->group)
826 return 2;
827
828 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200829 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100830
831 /* dont accept claims from gateways which are not in
832 * the same mesh or group.
833 */
834 if (!orig_node)
835 return 1;
836
837 /* if our mesh friends mac is bigger, use it for ourselves. */
838 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200839 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100840 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200841 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100842 bla_dst_own->group = bla_dst->group;
843 }
844
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200845 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100846
847 return 2;
848}
849
Simon Wunderlich1b371d12014-01-15 21:17:54 +0100850/**
851 * batadv_bla_process_claim
852 * @bat_priv: the bat priv with all the soft interface information
Martin Hundebølle3357182014-07-15 09:41:06 +0200853 * @primary_if: the primary hard interface of this batman soft interface
Simon Wunderlich23721382012-01-22 20:00:19 +0100854 * @skb: the frame to be checked
855 *
856 * Check if this is a claim frame, and process it accordingly.
857 *
858 * returns 1 if it was a claim frame, otherwise return 0 to
859 * tell the callee that it can use the frame on its own.
860 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200861static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
862 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200863 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100864{
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200865 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200866 uint8_t *hw_src, *hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200867 struct vlan_hdr *vhdr, vhdr_buf;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200868 struct ethhdr *ethhdr;
869 struct arphdr *arphdr;
870 unsigned short vid;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200871 int vlan_depth = 0;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200872 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100873 int headlen;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100874 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100875
Antonio Quartullic018ad32013-06-04 12:11:39 +0200876 vid = batadv_get_vid(skb, 0);
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200877 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100878
Antonio Quartullic018ad32013-06-04 12:11:39 +0200879 proto = ethhdr->h_proto;
880 headlen = ETH_HLEN;
881 if (vid & BATADV_VLAN_HAS_TAG) {
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200882 /* Traverse the VLAN/Ethertypes.
883 *
884 * At this point it is known that the first protocol is a VLAN
885 * header, so start checking at the encapsulated protocol.
886 *
887 * The depth of the VLAN headers is recorded to drop BLA claim
888 * frames encapsulated into multiple VLAN headers (QinQ).
889 */
890 do {
891 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
892 &vhdr_buf);
893 if (!vhdr)
894 return 0;
895
896 proto = vhdr->h_vlan_encapsulated_proto;
897 headlen += VLAN_HLEN;
898 vlan_depth++;
899 } while (proto == htons(ETH_P_8021Q));
Simon Wunderlich23721382012-01-22 20:00:19 +0100900 }
901
Antonio Quartulli293e9332013-05-19 12:55:16 +0200902 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100903 return 0; /* not a claim frame */
904
905 /* this must be a ARP frame. check if it is a claim. */
906
907 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
908 return 0;
909
910 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200911 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100912 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
913
914 /* Check whether the ARP frame carries a valid
915 * IP information
916 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100917 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
918 return 0;
919 if (arphdr->ar_pro != htons(ETH_P_IP))
920 return 0;
921 if (arphdr->ar_hln != ETH_ALEN)
922 return 0;
923 if (arphdr->ar_pln != 4)
924 return 0;
925
926 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
927 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200928 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlichd46b6bf2014-06-23 15:55:36 +0200929 bla_dst_own = &bat_priv->bla.claim_dest;
930
931 /* check if it is a claim frame in general */
932 if (memcmp(bla_dst->magic, bla_dst_own->magic,
933 sizeof(bla_dst->magic)) != 0)
934 return 0;
935
936 /* check if there is a claim frame encapsulated deeper in (QinQ) and
937 * drop that, as this is not supported by BLA but should also not be
938 * sent via the mesh.
939 */
940 if (vlan_depth > 1)
941 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100942
943 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200944 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
945 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100946 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200947 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200948 "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 +0200949 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
950 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100951
952 if (ret < 2)
953 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100954
955 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200956 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100957
958 /* check for the different types of claim frames ... */
959 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200960 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200961 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
962 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100963 return 1;
964 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200965 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200966 if (batadv_handle_unclaim(bat_priv, primary_if,
967 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100968 return 1;
969 break;
970
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200971 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200972 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
973 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100974 return 1;
975 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200976 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200977 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
978 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100979 return 1;
980 break;
981 }
982
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200983 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200984 "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 +0200985 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100986 return 1;
987}
988
989/* Check when we last heard from other nodes, and remove them in case of
990 * a time out, or clean all backbone gws if now is set.
991 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200992static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100993{
Marek Lindnerbae98772012-12-25 17:03:24 +0800994 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800995 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100996 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200997 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100998 spinlock_t *list_lock; /* protects write access to the hash lists */
999 int i;
1000
Sven Eckelmann807736f2012-07-15 22:26:51 +02001001 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001002 if (!hash)
1003 return;
1004
1005 for (i = 0; i < hash->size; i++) {
1006 head = &hash->table[i];
1007 list_lock = &hash->list_locks[i];
1008
1009 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08001010 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +01001011 head, hash_entry) {
1012 if (now)
1013 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001014 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001015 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001016 continue;
1017
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001018 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001019 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1020 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +01001021
1022purge_now:
1023 /* don't wait for the pending request anymore */
1024 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +02001025 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +01001026
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001027 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001028
Sasha Levinb67bfe02013-02-27 17:06:00 -08001029 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001030 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001031 }
1032 spin_unlock_bh(list_lock);
1033 }
1034}
1035
Ben Hutchings2c530402012-07-10 10:55:09 +00001036/**
1037 * batadv_bla_purge_claims
1038 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001039 * @primary_if: the selected primary interface, may be NULL if now is set
1040 * @now: whether the whole hash shall be wiped now
1041 *
1042 * Check when we heard last time from our own claims, and remove them in case of
1043 * a time out, or clean all claims if now is set
1044 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001045static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1046 struct batadv_hard_iface *primary_if,
1047 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001048{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001049 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001050 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001051 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001052 int i;
1053
Sven Eckelmann807736f2012-07-15 22:26:51 +02001054 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001055 if (!hash)
1056 return;
1057
1058 for (i = 0; i < hash->size; i++) {
1059 head = &hash->table[i];
1060
1061 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001062 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001063 if (now)
1064 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001065 if (!batadv_compare_eth(claim->backbone_gw->orig,
1066 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001067 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001068 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001069 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001070 continue;
1071
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001072 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001073 "bla_purge_claims(): %pM, vid %d, time out\n",
1074 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001075
1076purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001077 batadv_handle_unclaim(bat_priv, primary_if,
1078 claim->backbone_gw->orig,
1079 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001080 }
1081 rcu_read_unlock();
1082 }
1083}
1084
Ben Hutchings2c530402012-07-10 10:55:09 +00001085/**
1086 * batadv_bla_update_orig_address
1087 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001088 * @primary_if: the new selected primary_if
1089 * @oldif: the old primary interface, may be NULL
1090 *
1091 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001092 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001093void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1094 struct batadv_hard_iface *primary_if,
1095 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001096{
Marek Lindnerbae98772012-12-25 17:03:24 +08001097 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001098 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001099 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001100 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001101 int i;
1102
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001103 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001104 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1105 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001106
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001107 /* purge everything when bridge loop avoidance is turned off */
1108 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1109 oldif = NULL;
1110
Simon Wunderlich23721382012-01-22 20:00:19 +01001111 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001112 batadv_bla_purge_claims(bat_priv, NULL, 1);
1113 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001114 return;
1115 }
1116
Sven Eckelmann807736f2012-07-15 22:26:51 +02001117 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001118 if (!hash)
1119 return;
1120
1121 for (i = 0; i < hash->size; i++) {
1122 head = &hash->table[i];
1123
1124 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001125 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001126 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001127 if (!batadv_compare_eth(backbone_gw->orig,
1128 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001129 continue;
1130
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001131 ether_addr_copy(backbone_gw->orig,
1132 primary_if->net_dev->dev_addr);
Simon Wunderlich23721382012-01-22 20:00:19 +01001133 /* send an announce frame so others will ask for our
1134 * claims and update their tables.
1135 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001136 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001137 }
1138 rcu_read_unlock();
1139 }
1140}
1141
Simon Wunderlich23721382012-01-22 20:00:19 +01001142/* periodic work to do:
1143 * * purge structures when they are too old
1144 * * send announcements
1145 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001146static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001147{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001148 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001149 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001150 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001151 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001152 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001153 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001154 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001155 int i;
1156
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001157 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001158 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1159 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001160 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001161 if (!primary_if)
1162 goto out;
1163
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001164 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1165 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001166
1167 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1168 goto out;
1169
Sven Eckelmann807736f2012-07-15 22:26:51 +02001170 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001171 if (!hash)
1172 goto out;
1173
1174 for (i = 0; i < hash->size; i++) {
1175 head = &hash->table[i];
1176
1177 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001178 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001179 if (!batadv_compare_eth(backbone_gw->orig,
1180 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001181 continue;
1182
1183 backbone_gw->lasttime = jiffies;
1184
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001185 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001186
1187 /* request_sent is only set after creation to avoid
1188 * problems when we are not yet known as backbone gw
1189 * in the backbone.
1190 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001191 * We can reset this now after we waited some periods
1192 * to give bridge forward delays and bla group forming
1193 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001194 */
1195
1196 if (atomic_read(&backbone_gw->request_sent) == 0)
1197 continue;
1198
Simon Wunderlich28709872012-09-13 18:18:46 +02001199 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1200 continue;
1201
Simon Wunderlichd807f272012-09-09 22:27:57 +02001202 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1203 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001204 }
1205 rcu_read_unlock();
1206 }
1207out:
1208 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001209 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001210
Antonio Quartulli72414442012-12-25 13:14:37 +01001211 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1212 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001213}
1214
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001215/* The hash for claim and backbone hash receive the same key because they
1216 * are getting initialized by hash_new with the same key. Reinitializing
1217 * them with to different keys to allow nested locking without generating
1218 * lockdep warnings
1219 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001220static struct lock_class_key batadv_claim_hash_lock_class_key;
1221static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001222
Simon Wunderlich23721382012-01-22 20:00:19 +01001223/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001224int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001225{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001226 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001227 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001228 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001229 uint16_t crc;
1230 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001231
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001232 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1233
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001234 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001235
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001236 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001237 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1238 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001239 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001240 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001241 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1242 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001243 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001244 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001245 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001246 }
1247
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001248 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001249 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001250 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001251 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1252 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001253
Sven Eckelmann807736f2012-07-15 22:26:51 +02001254 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001255 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001256
Sven Eckelmann807736f2012-07-15 22:26:51 +02001257 bat_priv->bla.claim_hash = batadv_hash_new(128);
1258 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001259
Sven Eckelmann807736f2012-07-15 22:26:51 +02001260 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001261 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001262
Sven Eckelmann807736f2012-07-15 22:26:51 +02001263 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001264 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001265 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001266 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001267
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001268 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001269
Antonio Quartulli72414442012-12-25 13:14:37 +01001270 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1271
1272 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1273 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001274 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001275}
1276
Ben Hutchings2c530402012-07-10 10:55:09 +00001277/**
1278 * batadv_bla_check_bcast_duplist
1279 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001280 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001281 *
1282 * check if it is on our broadcast list. Another gateway might
1283 * have sent the same packet because it is connected to the same backbone,
1284 * so we have to remove this duplicate.
1285 *
1286 * This is performed by checking the CRC, which will tell us
1287 * with a good chance that it is the same packet. If it is furthermore
1288 * sent by another host, drop it. We allow equal packets from
1289 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001290 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001291int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001292 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001293{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001294 int i, curr, ret = 0;
1295 __be32 crc;
1296 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001297 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001298
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001299 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001300
1301 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001302 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001303
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001304 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1305
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001306 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001307 curr = (bat_priv->bla.bcast_duplist_curr + i);
1308 curr %= BATADV_DUPLIST_SIZE;
1309 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001310
1311 /* we can stop searching if the entry is too old ;
1312 * later entries will be even older
1313 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001314 if (batadv_has_timed_out(entry->entrytime,
1315 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001316 break;
1317
1318 if (entry->crc != crc)
1319 continue;
1320
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001321 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001322 continue;
1323
1324 /* this entry seems to match: same crc, not too old,
1325 * and from another gw. therefore return 1 to forbid it.
1326 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001327 ret = 1;
1328 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001329 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001330 /* not found, add a new entry (overwrite the oldest entry)
Antonio Quartulli3f687852014-11-02 11:29:56 +01001331 * and allow it, its the first occurrence.
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001332 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001333 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001334 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001335 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001336 entry->crc = crc;
1337 entry->entrytime = jiffies;
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001338 ether_addr_copy(entry->orig, bcast_packet->orig);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001339 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001340
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001341out:
1342 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1343
1344 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001345}
1346
Simon Wunderlich1b371d12014-01-15 21:17:54 +01001347/**
1348 * batadv_bla_is_backbone_gw_orig
1349 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001350 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001351 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001352 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001353 * Check if the originator is a gateway for the VLAN identified by vid.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001354 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001355 * Returns true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001356 */
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001357bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
1358 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001359{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001360 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001361 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001362 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001363 int i;
1364
1365 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001366 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001367
1368 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001369 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001370
1371 for (i = 0; i < hash->size; i++) {
1372 head = &hash->table[i];
1373
1374 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001375 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001376 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1377 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001378 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001379 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001380 }
1381 }
1382 rcu_read_unlock();
1383 }
1384
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001385 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001386}
1387
Ben Hutchings2c530402012-07-10 10:55:09 +00001388/**
1389 * batadv_bla_is_backbone_gw
1390 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001391 * @orig_node: the orig_node of the frame
1392 * @hdr_size: maximum length of the frame
1393 *
1394 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1395 * if the orig_node is also a gateway on the soft interface, otherwise it
1396 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001397 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001398int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001399 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001400{
Marek Lindnerbae98772012-12-25 17:03:24 +08001401 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001402 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001403
1404 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1405 return 0;
1406
1407 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001408 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001409 return 0;
1410
Antonio Quartullic018ad32013-06-04 12:11:39 +02001411 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001412
1413 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001414 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1415 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001416 if (!backbone_gw)
1417 return 0;
1418
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001419 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001420 return 1;
1421}
1422
1423/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001424void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001425{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001426 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001427
Sven Eckelmann807736f2012-07-15 22:26:51 +02001428 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001429 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001430
Sven Eckelmann807736f2012-07-15 22:26:51 +02001431 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001432 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001433 batadv_hash_destroy(bat_priv->bla.claim_hash);
1434 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001435 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001436 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001437 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001438 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1439 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001440 }
1441 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001442 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001443}
1444
Ben Hutchings2c530402012-07-10 10:55:09 +00001445/**
1446 * batadv_bla_rx
1447 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001448 * @skb: the frame to be checked
1449 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001450 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001451 *
1452 * bla_rx avoidance checks if:
1453 * * we have to race for a claim
1454 * * if the frame is allowed on the LAN
1455 *
1456 * in these cases, the skb is further handled by this function and
1457 * returns 1, otherwise it returns 0 and the caller shall further
1458 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001459 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001460int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1461 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001462{
1463 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001464 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001465 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001466 int ret;
1467
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001468 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001469
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001470 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001471 if (!primary_if)
1472 goto handled;
1473
1474 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1475 goto allow;
1476
Sven Eckelmann807736f2012-07-15 22:26:51 +02001477 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001478 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001479 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001480 goto handled;
1481
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001482 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001483 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001484 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001485
1486 if (!claim) {
1487 /* possible optimization: race for a claim */
1488 /* No claim exists yet, claim it for us!
1489 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001490 batadv_handle_claim(bat_priv, primary_if,
1491 primary_if->net_dev->dev_addr,
1492 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001493 goto allow;
1494 }
1495
1496 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001497 if (batadv_compare_eth(claim->backbone_gw->orig,
1498 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001499 /* ... allow it in any case */
1500 claim->lasttime = jiffies;
1501 goto allow;
1502 }
1503
1504 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001505 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1506 /* ... drop it. the responsible gateway is in charge.
1507 *
1508 * We need to check is_bcast because with the gateway
1509 * feature, broadcasts (like DHCP requests) may be sent
1510 * using a unicast packet type.
1511 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001512 goto handled;
1513 } else {
1514 /* seems the client considers us as its best gateway.
1515 * send a claim and update the claim table
1516 * immediately.
1517 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001518 batadv_handle_claim(bat_priv, primary_if,
1519 primary_if->net_dev->dev_addr,
1520 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001521 goto allow;
1522 }
1523allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001524 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001525 ret = 0;
1526 goto out;
1527
1528handled:
1529 kfree_skb(skb);
1530 ret = 1;
1531
1532out:
1533 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001534 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001535 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001536 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001537 return ret;
1538}
1539
Ben Hutchings2c530402012-07-10 10:55:09 +00001540/**
1541 * batadv_bla_tx
1542 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001543 * @skb: the frame to be checked
1544 * @vid: the VLAN ID of the frame
1545 *
1546 * bla_tx checks if:
1547 * * a claim was received which has to be processed
1548 * * the frame is allowed on the mesh
1549 *
1550 * in these cases, the skb is further handled by this function and
1551 * returns 1, otherwise it returns 0 and the caller shall further
1552 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001553 *
1554 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001555 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001556int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1557 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001558{
1559 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001560 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001561 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001562 int ret = 0;
1563
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001564 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001565 if (!primary_if)
1566 goto out;
1567
1568 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1569 goto allow;
1570
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001571 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001572 goto handled;
1573
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001574 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001575
Sven Eckelmann807736f2012-07-15 22:26:51 +02001576 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001577 /* don't allow broadcasts while requests are in flight */
1578 if (is_multicast_ether_addr(ethhdr->h_dest))
1579 goto handled;
1580
Antonio Quartulli8fdd0152014-01-22 00:42:11 +01001581 ether_addr_copy(search_claim.addr, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +01001582 search_claim.vid = vid;
1583
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001584 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001585
1586 /* if no claim exists, allow it. */
1587 if (!claim)
1588 goto allow;
1589
1590 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001591 if (batadv_compare_eth(claim->backbone_gw->orig,
1592 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001593 /* if yes, the client has roamed and we have
1594 * to unclaim it.
1595 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001596 batadv_handle_unclaim(bat_priv, primary_if,
1597 primary_if->net_dev->dev_addr,
1598 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001599 goto allow;
1600 }
1601
1602 /* check if it is a multicast/broadcast frame */
1603 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1604 /* drop it. the responsible gateway has forwarded it into
1605 * the backbone network.
1606 */
1607 goto handled;
1608 } else {
1609 /* we must allow it. at least if we are
1610 * responsible for the DESTINATION.
1611 */
1612 goto allow;
1613 }
1614allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001615 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001616 ret = 0;
1617 goto out;
1618handled:
1619 ret = 1;
1620out:
1621 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001622 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001623 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001624 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001625 return ret;
1626}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001627
Sven Eckelmann08adf152012-05-12 13:38:47 +02001628int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001629{
1630 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001631 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001632 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001633 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001634 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001635 struct hlist_head *head;
1636 uint32_t i;
1637 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001638 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001639
Marek Lindner30da63a2012-08-03 17:15:46 +02001640 primary_if = batadv_seq_print_text_primary_if_get(seq);
1641 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001643
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001644 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001645 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001646 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001647 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001648 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001649 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001650 "Client", "VID", "Originator", "CRC");
1651 for (i = 0; i < hash->size; i++) {
1652 head = &hash->table[i];
1653
1654 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001655 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001656 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1657 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001658 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001659 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001660 claim->backbone_gw->orig,
1661 (is_own ? 'x' : ' '),
1662 claim->backbone_gw->crc);
1663 }
1664 rcu_read_unlock();
1665 }
1666out:
1667 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001668 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001669 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001670}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001671
1672int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1673{
1674 struct net_device *net_dev = (struct net_device *)seq->private;
1675 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001676 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001677 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001678 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001679 struct hlist_head *head;
1680 int secs, msecs;
1681 uint32_t i;
1682 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001683 uint8_t *primary_addr;
1684
Marek Lindner30da63a2012-08-03 17:15:46 +02001685 primary_if = batadv_seq_print_text_primary_if_get(seq);
1686 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001687 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001688
1689 primary_addr = primary_if->net_dev->dev_addr;
1690 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001691 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001692 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001693 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001694 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001695 "Originator", "VID", "last seen", "CRC");
1696 for (i = 0; i < hash->size; i++) {
1697 head = &hash->table[i];
1698
1699 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001700 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001701 msecs = jiffies_to_msecs(jiffies -
1702 backbone_gw->lasttime);
1703 secs = msecs / 1000;
1704 msecs = msecs % 1000;
1705
1706 is_own = batadv_compare_eth(backbone_gw->orig,
1707 primary_addr);
1708 if (is_own)
1709 continue;
1710
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001711 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001712 backbone_gw->orig,
1713 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001714 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001715 }
1716 rcu_read_unlock();
1717 }
1718out:
1719 if (primary_if)
1720 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001721 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001722}