blob: 28eb5e6d0a02510a0a7b4e268f7dc34a26bc182a [file] [log] [blame]
Antonio Quartulli0b873932013-01-04 03:05:31 +01001/* Copyright (C) 2011-2013 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
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
Simon Wunderlich23721382012-01-22 20:00:19 +010018 */
19
20#include "main.h"
21#include "hash.h"
22#include "hard-interface.h"
23#include "originator.h"
24#include "bridge_loop_avoidance.h"
Simon Wunderlich20ff9d52012-01-22 20:00:23 +010025#include "translation-table.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010026#include "send.h"
27
28#include <linux/etherdevice.h>
29#include <linux/crc16.h>
30#include <linux/if_arp.h>
31#include <net/arp.h>
32#include <linux/if_vlan.h>
33
Sven Eckelmann3b300de2012-05-12 18:33:53 +020034static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
Simon Wunderlich23721382012-01-22 20:00:19 +010035
Sven Eckelmann3b300de2012-05-12 18:33:53 +020036static void batadv_bla_periodic_work(struct work_struct *work);
Marek Lindnerbae98772012-12-25 17:03:24 +080037static void
38batadv_bla_send_announce(struct batadv_priv *bat_priv,
39 struct batadv_bla_backbone_gw *backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +010040
41/* return the index of the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020042static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010043{
Marek Lindner712bbfe42012-12-25 17:03:25 +080044 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010045 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010046
Simon Wunderlich07568d02012-08-30 18:22:27 +020047 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
48 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010049
50 hash += (hash << 3);
51 hash ^= (hash >> 11);
52 hash += (hash << 15);
53
54 return hash % size;
55}
56
57/* return the index of the backbone gateway */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020058static inline uint32_t batadv_choose_backbone_gw(const void *data,
59 uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010060{
Marek Lindner712bbfe42012-12-25 17:03:25 +080061 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010062 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010063
Simon Wunderlich07568d02012-08-30 18:22:27 +020064 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
65 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010066
67 hash += (hash << 3);
68 hash ^= (hash >> 11);
69 hash += (hash << 15);
70
71 return hash % size;
72}
73
74
75/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020076static int batadv_compare_backbone_gw(const struct hlist_node *node,
77 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010078{
Marek Lindnerbae98772012-12-25 17:03:24 +080079 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010080 hash_entry);
Marek Lindnerbae98772012-12-25 17:03:24 +080081 const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010082
Simon Wunderlichc76d1522012-10-15 22:38:04 +020083 if (!batadv_compare_eth(gw1->orig, gw2->orig))
84 return 0;
85
86 if (gw1->vid != gw2->vid)
87 return 0;
88
89 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +010090}
91
92/* compares address and vid of two claims */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020093static int batadv_compare_claim(const struct hlist_node *node,
94 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010095{
Marek Lindner712bbfe42012-12-25 17:03:25 +080096 const void *data1 = container_of(node, struct batadv_bla_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +010097 hash_entry);
Marek Lindner712bbfe42012-12-25 17:03:25 +080098 const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010099
Simon Wunderlichc76d1522012-10-15 22:38:04 +0200100 if (!batadv_compare_eth(cl1->addr, cl2->addr))
101 return 0;
102
103 if (cl1->vid != cl2->vid)
104 return 0;
105
106 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100107}
108
109/* free a backbone gw */
Marek Lindnerbae98772012-12-25 17:03:24 +0800110static void
111batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100112{
113 if (atomic_dec_and_test(&backbone_gw->refcount))
114 kfree_rcu(backbone_gw, rcu);
115}
116
117/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200118static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100119{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800120 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100121
Marek Lindner712bbfe42012-12-25 17:03:25 +0800122 claim = container_of(rcu, struct batadv_bla_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100123
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200124 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100125 kfree(claim);
126}
127
128/* free a claim, call claim_free_rcu if its the last reference */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800129static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100130{
131 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200132 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100133}
134
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200135/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100136 * @data: search data (may be local/static data)
137 *
138 * looks for a claim in the hash, and returns it if found
139 * or NULL otherwise.
140 */
Marek Lindner712bbfe42012-12-25 17:03:25 +0800141static struct batadv_bla_claim
142*batadv_claim_hash_find(struct batadv_priv *bat_priv,
143 struct batadv_bla_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100144{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200145 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100146 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800147 struct batadv_bla_claim *claim;
148 struct batadv_bla_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100149 int index;
150
151 if (!hash)
152 return NULL;
153
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200154 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100155 head = &hash->table[index];
156
157 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800158 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200159 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100160 continue;
161
162 if (!atomic_inc_not_zero(&claim->refcount))
163 continue;
164
165 claim_tmp = claim;
166 break;
167 }
168 rcu_read_unlock();
169
170 return claim_tmp;
171}
172
Ben Hutchings2c530402012-07-10 10:55:09 +0000173/**
174 * batadv_backbone_hash_find - looks for a claim in the hash
175 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100176 * @addr: the address of the originator
177 * @vid: the VLAN ID
178 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000179 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100180 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800181static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200182batadv_backbone_hash_find(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200183 uint8_t *addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100184{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200185 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100186 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +0800187 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
188 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100189 int index;
190
191 if (!hash)
192 return NULL;
193
194 memcpy(search_entry.orig, addr, ETH_ALEN);
195 search_entry.vid = vid;
196
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200197 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100198 head = &hash->table[index];
199
200 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800201 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200202 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
203 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100204 continue;
205
206 if (!atomic_inc_not_zero(&backbone_gw->refcount))
207 continue;
208
209 backbone_gw_tmp = backbone_gw;
210 break;
211 }
212 rcu_read_unlock();
213
214 return backbone_gw_tmp;
215}
216
217/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200218static void
Marek Lindnerbae98772012-12-25 17:03:24 +0800219batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100220{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200221 struct batadv_hashtable *hash;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800222 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100223 struct hlist_head *head;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800224 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100225 int i;
226 spinlock_t *list_lock; /* protects write access to the hash lists */
227
Sven Eckelmann807736f2012-07-15 22:26:51 +0200228 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100229 if (!hash)
230 return;
231
232 for (i = 0; i < hash->size; i++) {
233 head = &hash->table[i];
234 list_lock = &hash->list_locks[i];
235
236 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800237 hlist_for_each_entry_safe(claim, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100238 head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100239 if (claim->backbone_gw != backbone_gw)
240 continue;
241
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200242 batadv_claim_free_ref(claim);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800243 hlist_del_rcu(&claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100244 }
245 spin_unlock_bh(list_lock);
246 }
247
248 /* all claims gone, intialize CRC */
Sven Eckelmann3964f722012-06-03 22:19:10 +0200249 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100250}
251
Ben Hutchings2c530402012-07-10 10:55:09 +0000252/**
253 * batadv_bla_send_claim - sends a claim frame according to the provided info
254 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100255 * @orig: the mac address to be announced within the claim
256 * @vid: the VLAN ID
257 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100258 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200259static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200260 unsigned short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100261{
262 struct sk_buff *skb;
263 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200264 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100265 struct net_device *soft_iface;
266 uint8_t *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200267 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100268 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100269
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200270 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100271 if (!primary_if)
272 return;
273
Sven Eckelmann807736f2012-07-15 22:26:51 +0200274 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100275 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100276 local_claim_dest.type = claimtype;
277
278 soft_iface = primary_if->soft_iface;
279
280 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
281 /* IP DST: 0.0.0.0 */
282 zeroip,
283 primary_if->soft_iface,
284 /* IP SRC: 0.0.0.0 */
285 zeroip,
286 /* Ethernet DST: Broadcast */
287 NULL,
288 /* Ethernet SRC/HW SRC: originator mac */
289 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200290 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100291 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100292 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100293 */
294 (uint8_t *)&local_claim_dest);
295
296 if (!skb)
297 goto out;
298
299 ethhdr = (struct ethhdr *)skb->data;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100300 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100301
302 /* now we pretend that the client would have sent this ... */
303 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200304 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100305 /* normal claim frame
306 * set Ethernet SRC to the clients mac
307 */
308 memcpy(ethhdr->h_source, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200309 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200310 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
311 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100312 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200313 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100314 /* unclaim frame
315 * set HW SRC to the clients mac
316 */
317 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200318 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200319 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200320 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100321 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200322 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100323 /* announcement frame
324 * set HW SRC to the special mac containg the crc
325 */
326 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200327 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200328 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200329 ethhdr->h_source, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100330 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200331 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100332 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200333 * set HW SRC and header destination to the receiving backbone
334 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100335 */
336 memcpy(hw_src, mac, ETH_ALEN);
337 memcpy(ethhdr->h_dest, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200338 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200339 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200340 ethhdr->h_source, ethhdr->h_dest,
341 BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100342 break;
Simon Wunderlich23721382012-01-22 20:00:19 +0100343 }
344
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200345 if (vid & BATADV_VLAN_HAS_TAG)
346 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
347 vid & VLAN_VID_MASK);
Simon Wunderlich23721382012-01-22 20:00:19 +0100348
349 skb_reset_mac_header(skb);
350 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200351 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
352 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
353 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100354 soft_iface->last_rx = jiffies;
355
356 netif_rx(skb);
357out:
358 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200359 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100360}
361
Ben Hutchings2c530402012-07-10 10:55:09 +0000362/**
363 * batadv_bla_get_backbone_gw
364 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100365 * @orig: the mac address of the originator
366 * @vid: the VLAN ID
367 *
368 * searches for the backbone gw or creates a new one if it could not
369 * be found.
370 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800371static struct batadv_bla_backbone_gw *
Sven Eckelmann56303d32012-06-05 22:31:31 +0200372batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200373 unsigned short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100374{
Marek Lindnerbae98772012-12-25 17:03:24 +0800375 struct batadv_bla_backbone_gw *entry;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200376 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100377 int hash_added;
378
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200379 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100380
381 if (entry)
382 return entry;
383
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200384 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200385 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200386 orig, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100387
388 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
389 if (!entry)
390 return NULL;
391
392 entry->vid = vid;
393 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200394 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100395 entry->bat_priv = bat_priv;
396 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200397 atomic_set(&entry->wait_periods, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +0100398 memcpy(entry->orig, orig, ETH_ALEN);
399
400 /* one for the hash, one for returning */
401 atomic_set(&entry->refcount, 2);
402
Sven Eckelmann807736f2012-07-15 22:26:51 +0200403 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200404 batadv_compare_backbone_gw,
405 batadv_choose_backbone_gw, entry,
406 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100407
408 if (unlikely(hash_added != 0)) {
409 /* hash failed, free the structure */
410 kfree(entry);
411 return NULL;
412 }
413
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200414 /* this is a gateway now, remove any TT entry on this VLAN */
Sven Eckelmannda641192012-05-12 13:48:56 +0200415 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100416 if (orig_node) {
Antonio Quartulli95fb1302013-08-07 18:28:55 +0200417 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200418 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200419 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100420 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200421
Simon Wunderlichd807f272012-09-09 22:27:57 +0200422 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200423 batadv_bla_send_announce(bat_priv, entry);
424
Simon Wunderlichd807f272012-09-09 22:27:57 +0200425 /* this will be decreased in the worker thread */
426 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200427 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200428 atomic_inc(&bat_priv->bla.num_requests);
429 }
430
Simon Wunderlich23721382012-01-22 20:00:19 +0100431 return entry;
432}
433
434/* update or add the own backbone gw to make sure we announce
435 * where we receive other backbone gws
436 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200437static void
438batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
439 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200440 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100441{
Marek Lindnerbae98772012-12-25 17:03:24 +0800442 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100443
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200444 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
445 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200446 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100447 if (unlikely(!backbone_gw))
448 return;
449
450 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200451 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100452}
453
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200454/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100455 * @vid: the vid where the request came on
456 *
457 * Repeat all of our own claims, and finally send an ANNOUNCE frame
458 * to allow the requester another check if the CRC is correct now.
459 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200460static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
461 struct batadv_hard_iface *primary_if,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200462 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100463{
Simon Wunderlich23721382012-01-22 20:00:19 +0100464 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200465 struct batadv_hashtable *hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +0800466 struct batadv_bla_claim *claim;
Marek Lindnerbae98772012-12-25 17:03:24 +0800467 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100468 int i;
469
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200470 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200471 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100472
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200473 backbone_gw = batadv_backbone_hash_find(bat_priv,
474 primary_if->net_dev->dev_addr,
475 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100476 if (!backbone_gw)
477 return;
478
Sven Eckelmann807736f2012-07-15 22:26:51 +0200479 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100480 for (i = 0; i < hash->size; i++) {
481 head = &hash->table[i];
482
483 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800484 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100485 /* only own claims are interesting */
486 if (claim->backbone_gw != backbone_gw)
487 continue;
488
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200489 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200490 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100491 }
492 rcu_read_unlock();
493 }
494
495 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200496 batadv_bla_send_announce(bat_priv, backbone_gw);
497 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100498}
499
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200500/* @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100501 *
502 * When the crc is wrong, ask the backbone gateway for a full table update.
503 * After the request, it will repeat all of his own claims and finally
504 * send an announcement claim with which we can check again.
505 */
Marek Lindnerbae98772012-12-25 17:03:24 +0800506static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100507{
508 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200509 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100510
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200511 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
512 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100513
514 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200515 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200516 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100517
518 /* no local broadcasts should be sent or received, for now. */
519 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200520 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100521 atomic_set(&backbone_gw->request_sent, 1);
522 }
523}
524
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200525/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100526 * @backbone_gw: our backbone gateway which should be announced
527 *
528 * This function sends an announcement. It is called from multiple
529 * places.
530 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200531static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
Marek Lindnerbae98772012-12-25 17:03:24 +0800532 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100533{
534 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100535 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100536
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200537 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100538 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100539 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100540
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200541 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200542 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100543}
544
Ben Hutchings2c530402012-07-10 10:55:09 +0000545/**
546 * batadv_bla_add_claim - Adds a claim in the claim hash
547 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100548 * @mac: the mac address of the claim
549 * @vid: the VLAN ID of the frame
550 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100551 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200552static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200553 const uint8_t *mac, const unsigned short vid,
Marek Lindnerbae98772012-12-25 17:03:24 +0800554 struct batadv_bla_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100555{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800556 struct batadv_bla_claim *claim;
557 struct batadv_bla_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100558 int hash_added;
559
560 memcpy(search_claim.addr, mac, ETH_ALEN);
561 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200562 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100563
564 /* create a new claim entry if it does not exist yet. */
565 if (!claim) {
566 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
567 if (!claim)
568 return;
569
570 memcpy(claim->addr, mac, ETH_ALEN);
571 claim->vid = vid;
572 claim->lasttime = jiffies;
573 claim->backbone_gw = backbone_gw;
574
575 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200576 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200577 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200578 mac, BATADV_PRINT_VID(vid));
Sven Eckelmann807736f2012-07-15 22:26:51 +0200579 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200580 batadv_compare_claim,
581 batadv_choose_claim, claim,
582 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100583
584 if (unlikely(hash_added != 0)) {
585 /* only local changes happened. */
586 kfree(claim);
587 return;
588 }
589 } else {
590 claim->lasttime = jiffies;
591 if (claim->backbone_gw == backbone_gw)
592 /* no need to register a new backbone */
593 goto claim_free_ref;
594
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200595 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200596 "bla_add_claim(): changing ownership for %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200597 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100598
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200599 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200600 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100601 }
602 /* set (new) backbone gw */
603 atomic_inc(&backbone_gw->refcount);
604 claim->backbone_gw = backbone_gw;
605
606 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
607 backbone_gw->lasttime = jiffies;
608
609claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200610 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100611}
612
613/* Delete a claim from the claim hash which has the
614 * given mac address and vid.
615 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200616static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200617 const uint8_t *mac, const unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100618{
Marek Lindner712bbfe42012-12-25 17:03:25 +0800619 struct batadv_bla_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100620
621 memcpy(search_claim.addr, mac, ETH_ALEN);
622 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200623 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100624 if (!claim)
625 return;
626
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200627 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200628 mac, BATADV_PRINT_VID(vid));
Simon Wunderlich23721382012-01-22 20:00:19 +0100629
Sven Eckelmann807736f2012-07-15 22:26:51 +0200630 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200631 batadv_choose_claim, claim);
632 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100633
634 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
635
636 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200637 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100638}
639
640/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200641static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200642 uint8_t *an_addr, uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200643 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100644{
Marek Lindnerbae98772012-12-25 17:03:24 +0800645 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100646 uint16_t crc;
647
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200648 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100649 return 0;
650
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200651 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
652 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100653
654 if (unlikely(!backbone_gw))
655 return 1;
656
657
658 /* handle as ANNOUNCE frame */
659 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100660 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100661
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200662 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100663 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200664 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100665
666 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200667 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100668 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200669 backbone_gw->orig,
670 BATADV_PRINT_VID(backbone_gw->vid),
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200671 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100672
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200673 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100674 } else {
675 /* if we have sent a request and the crc was OK,
676 * we can allow traffic again.
677 */
678 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200679 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100680 atomic_set(&backbone_gw->request_sent, 0);
681 }
682 }
683
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200684 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100685 return 1;
686}
687
688/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200689static int batadv_handle_request(struct batadv_priv *bat_priv,
690 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200691 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200692 struct ethhdr *ethhdr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100693{
694 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200695 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100696 return 0;
697
698 /* sanity check, this should not happen on a normal switch,
699 * we ignore it in this case.
700 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200701 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100702 return 1;
703
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200704 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200705 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200706 BATADV_PRINT_VID(vid), ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100707
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200708 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100709 return 1;
710}
711
712/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200713static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
714 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200715 uint8_t *backbone_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200716 uint8_t *claim_addr, unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100717{
Marek Lindnerbae98772012-12-25 17:03:24 +0800718 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100719
720 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200721 if (primary_if && batadv_compare_eth(backbone_addr,
722 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200723 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200724 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100725
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200726 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100727
728 if (!backbone_gw)
729 return 1;
730
731 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200732 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200733 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +0200734 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100735
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200736 batadv_bla_del_claim(bat_priv, claim_addr, vid);
737 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100738 return 1;
739}
740
741/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200742static int batadv_handle_claim(struct batadv_priv *bat_priv,
743 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200744 uint8_t *backbone_addr, uint8_t *claim_addr,
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200745 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100746{
Marek Lindnerbae98772012-12-25 17:03:24 +0800747 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100748
749 /* register the gateway if not yet available, and add the claim. */
750
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200751 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
752 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100753
754 if (unlikely(!backbone_gw))
755 return 1;
756
757 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200758 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200759 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200760 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200761 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100762
763 /* TODO: we could call something like tt_local_del() here. */
764
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200765 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100766 return 1;
767}
768
Ben Hutchings2c530402012-07-10 10:55:09 +0000769/**
770 * batadv_check_claim_group
771 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100772 * @hw_src: the Hardware source in the ARP Header
773 * @hw_dst: the Hardware destination in the ARP Header
774 * @ethhdr: pointer to the Ethernet header of the claim frame
775 *
776 * checks if it is a claim packet and if its on the same group.
777 * This function also applies the group ID of the sender
778 * if it is in the same mesh.
779 *
780 * returns:
781 * 2 - if it is a claim packet and on the same group
782 * 1 - if is a claim packet from another group
783 * 0 - if it is not a claim packet
784 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200785static int batadv_check_claim_group(struct batadv_priv *bat_priv,
786 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200787 uint8_t *hw_src, uint8_t *hw_dst,
788 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100789{
790 uint8_t *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200791 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200792 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100793
Sven Eckelmann96412692012-06-05 22:31:30 +0200794 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200795 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100796
797 /* check if it is a claim packet in general */
798 if (memcmp(bla_dst->magic, bla_dst_own->magic,
799 sizeof(bla_dst->magic)) != 0)
800 return 0;
801
802 /* if announcement packet, use the source,
803 * otherwise assume it is in the hw_src
804 */
805 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200806 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100807 backbone_addr = hw_src;
808 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200809 case BATADV_CLAIM_TYPE_REQUEST:
810 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200811 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100812 backbone_addr = ethhdr->h_source;
813 break;
814 default:
815 return 0;
816 }
817
818 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200819 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100820 return 0;
821
822 /* if its already the same group, it is fine. */
823 if (bla_dst->group == bla_dst_own->group)
824 return 2;
825
826 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200827 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100828
829 /* dont accept claims from gateways which are not in
830 * the same mesh or group.
831 */
832 if (!orig_node)
833 return 1;
834
835 /* if our mesh friends mac is bigger, use it for ourselves. */
836 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200837 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100838 "taking other backbones claim group: %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200839 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100840 bla_dst_own->group = bla_dst->group;
841 }
842
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200843 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100844
845 return 2;
846}
847
848
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200849/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100850 * @skb: the frame to be checked
851 *
852 * Check if this is a claim frame, and process it accordingly.
853 *
854 * returns 1 if it was a claim frame, otherwise return 0 to
855 * tell the callee that it can use the frame on its own.
856 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200857static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
858 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200859 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100860{
Sven Eckelmann96412692012-06-05 22:31:30 +0200861 struct batadv_bla_claim_dst *bla_dst;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200862 uint8_t *hw_src, *hw_dst;
863 struct vlan_ethhdr *vhdr;
864 struct ethhdr *ethhdr;
865 struct arphdr *arphdr;
866 unsigned short vid;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200867 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100868 int headlen;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100869 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100870
Antonio Quartullic018ad32013-06-04 12:11:39 +0200871 vid = batadv_get_vid(skb, 0);
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200872 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100873
Antonio Quartullic018ad32013-06-04 12:11:39 +0200874 proto = ethhdr->h_proto;
875 headlen = ETH_HLEN;
876 if (vid & BATADV_VLAN_HAS_TAG) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100877 vhdr = (struct vlan_ethhdr *)ethhdr;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200878 proto = vhdr->h_vlan_encapsulated_proto;
Antonio Quartullic018ad32013-06-04 12:11:39 +0200879 headlen += VLAN_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100880 }
881
Antonio Quartulli293e9332013-05-19 12:55:16 +0200882 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100883 return 0; /* not a claim frame */
884
885 /* this must be a ARP frame. check if it is a claim. */
886
887 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
888 return 0;
889
890 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200891 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100892 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
893
894 /* Check whether the ARP frame carries a valid
895 * IP information
896 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100897 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
898 return 0;
899 if (arphdr->ar_pro != htons(ETH_P_IP))
900 return 0;
901 if (arphdr->ar_hln != ETH_ALEN)
902 return 0;
903 if (arphdr->ar_pln != 4)
904 return 0;
905
906 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
907 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200908 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100909
910 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200911 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
912 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100913 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200914 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200915 "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 +0200916 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
917 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100918
919 if (ret < 2)
920 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100921
922 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200923 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100924
925 /* check for the different types of claim frames ... */
926 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200927 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200928 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
929 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100930 return 1;
931 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200932 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200933 if (batadv_handle_unclaim(bat_priv, primary_if,
934 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100935 return 1;
936 break;
937
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200938 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200939 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
940 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100941 return 1;
942 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200943 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200944 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
945 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100946 return 1;
947 break;
948 }
949
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200950 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200951 "bla_process_claim(): 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 +0200952 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100953 return 1;
954}
955
956/* Check when we last heard from other nodes, and remove them in case of
957 * a time out, or clean all backbone gws if now is set.
958 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200959static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100960{
Marek Lindnerbae98772012-12-25 17:03:24 +0800961 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800962 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100963 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200964 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100965 spinlock_t *list_lock; /* protects write access to the hash lists */
966 int i;
967
Sven Eckelmann807736f2012-07-15 22:26:51 +0200968 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100969 if (!hash)
970 return;
971
972 for (i = 0; i < hash->size; i++) {
973 head = &hash->table[i];
974 list_lock = &hash->list_locks[i];
975
976 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800977 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100978 head, hash_entry) {
979 if (now)
980 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200981 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200982 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +0100983 continue;
984
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200985 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200986 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
987 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100988
989purge_now:
990 /* don't wait for the pending request anymore */
991 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +0200992 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100993
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200994 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100995
Sasha Levinb67bfe02013-02-27 17:06:00 -0800996 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200997 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100998 }
999 spin_unlock_bh(list_lock);
1000 }
1001}
1002
Ben Hutchings2c530402012-07-10 10:55:09 +00001003/**
1004 * batadv_bla_purge_claims
1005 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001006 * @primary_if: the selected primary interface, may be NULL if now is set
1007 * @now: whether the whole hash shall be wiped now
1008 *
1009 * Check when we heard last time from our own claims, and remove them in case of
1010 * a time out, or clean all claims if now is set
1011 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001012static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1013 struct batadv_hard_iface *primary_if,
1014 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001015{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001016 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001017 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001018 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001019 int i;
1020
Sven Eckelmann807736f2012-07-15 22:26:51 +02001021 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001022 if (!hash)
1023 return;
1024
1025 for (i = 0; i < hash->size; i++) {
1026 head = &hash->table[i];
1027
1028 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001029 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001030 if (now)
1031 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001032 if (!batadv_compare_eth(claim->backbone_gw->orig,
1033 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001034 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001035 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001036 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001037 continue;
1038
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001039 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001040 "bla_purge_claims(): %pM, vid %d, time out\n",
1041 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001042
1043purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001044 batadv_handle_unclaim(bat_priv, primary_if,
1045 claim->backbone_gw->orig,
1046 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001047 }
1048 rcu_read_unlock();
1049 }
1050}
1051
Ben Hutchings2c530402012-07-10 10:55:09 +00001052/**
1053 * batadv_bla_update_orig_address
1054 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001055 * @primary_if: the new selected primary_if
1056 * @oldif: the old primary interface, may be NULL
1057 *
1058 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001059 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001060void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1061 struct batadv_hard_iface *primary_if,
1062 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001063{
Marek Lindnerbae98772012-12-25 17:03:24 +08001064 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001065 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001066 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001067 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001068 int i;
1069
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001070 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001071 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1072 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001073
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001074 /* purge everything when bridge loop avoidance is turned off */
1075 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1076 oldif = NULL;
1077
Simon Wunderlich23721382012-01-22 20:00:19 +01001078 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001079 batadv_bla_purge_claims(bat_priv, NULL, 1);
1080 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001081 return;
1082 }
1083
Sven Eckelmann807736f2012-07-15 22:26:51 +02001084 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001085 if (!hash)
1086 return;
1087
1088 for (i = 0; i < hash->size; i++) {
1089 head = &hash->table[i];
1090
1091 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001092 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001093 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001094 if (!batadv_compare_eth(backbone_gw->orig,
1095 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001096 continue;
1097
1098 memcpy(backbone_gw->orig,
1099 primary_if->net_dev->dev_addr, ETH_ALEN);
1100 /* send an announce frame so others will ask for our
1101 * claims and update their tables.
1102 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001103 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001104 }
1105 rcu_read_unlock();
1106 }
1107}
1108
Simon Wunderlich23721382012-01-22 20:00:19 +01001109/* periodic work to do:
1110 * * purge structures when they are too old
1111 * * send announcements
1112 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001113static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001114{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001115 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001116 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001117 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001118 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001119 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001120 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001121 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001122 int i;
1123
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001124 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001125 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1126 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001127 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001128 if (!primary_if)
1129 goto out;
1130
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001131 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1132 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001133
1134 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1135 goto out;
1136
Sven Eckelmann807736f2012-07-15 22:26:51 +02001137 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001138 if (!hash)
1139 goto out;
1140
1141 for (i = 0; i < hash->size; i++) {
1142 head = &hash->table[i];
1143
1144 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001145 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001146 if (!batadv_compare_eth(backbone_gw->orig,
1147 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001148 continue;
1149
1150 backbone_gw->lasttime = jiffies;
1151
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001152 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001153
1154 /* request_sent is only set after creation to avoid
1155 * problems when we are not yet known as backbone gw
1156 * in the backbone.
1157 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001158 * We can reset this now after we waited some periods
1159 * to give bridge forward delays and bla group forming
1160 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001161 */
1162
1163 if (atomic_read(&backbone_gw->request_sent) == 0)
1164 continue;
1165
Simon Wunderlich28709872012-09-13 18:18:46 +02001166 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1167 continue;
1168
Simon Wunderlichd807f272012-09-09 22:27:57 +02001169 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1170 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001171 }
1172 rcu_read_unlock();
1173 }
1174out:
1175 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001176 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001177
Antonio Quartulli72414442012-12-25 13:14:37 +01001178 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1179 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001180}
1181
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001182/* The hash for claim and backbone hash receive the same key because they
1183 * are getting initialized by hash_new with the same key. Reinitializing
1184 * them with to different keys to allow nested locking without generating
1185 * lockdep warnings
1186 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001187static struct lock_class_key batadv_claim_hash_lock_class_key;
1188static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001189
Simon Wunderlich23721382012-01-22 20:00:19 +01001190/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001191int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001192{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001193 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001194 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001195 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001196 uint16_t crc;
1197 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001198
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001199 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1200
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001201 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001202
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001203 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001204 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1205 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001206 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001207 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001208 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1209 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001210 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001211 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001212 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001213 }
1214
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001215 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001216 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001217 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001218 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1219 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001220
Sven Eckelmann807736f2012-07-15 22:26:51 +02001221 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001222 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001223
Sven Eckelmann807736f2012-07-15 22:26:51 +02001224 bat_priv->bla.claim_hash = batadv_hash_new(128);
1225 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001226
Sven Eckelmann807736f2012-07-15 22:26:51 +02001227 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001228 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001229
Sven Eckelmann807736f2012-07-15 22:26:51 +02001230 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001231 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001232 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001233 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001234
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001235 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001236
Antonio Quartulli72414442012-12-25 13:14:37 +01001237 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1238
1239 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1240 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001241 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001242}
1243
Ben Hutchings2c530402012-07-10 10:55:09 +00001244/**
1245 * batadv_bla_check_bcast_duplist
1246 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001247 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001248 *
1249 * check if it is on our broadcast list. Another gateway might
1250 * have sent the same packet because it is connected to the same backbone,
1251 * so we have to remove this duplicate.
1252 *
1253 * This is performed by checking the CRC, which will tell us
1254 * with a good chance that it is the same packet. If it is furthermore
1255 * sent by another host, drop it. We allow equal packets from
1256 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001257 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001258int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001259 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001260{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001261 int i, curr, ret = 0;
1262 __be32 crc;
1263 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001264 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001265
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001266 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001267
1268 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001269 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001270
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001271 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1272
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001273 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001274 curr = (bat_priv->bla.bcast_duplist_curr + i);
1275 curr %= BATADV_DUPLIST_SIZE;
1276 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001277
1278 /* we can stop searching if the entry is too old ;
1279 * later entries will be even older
1280 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001281 if (batadv_has_timed_out(entry->entrytime,
1282 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001283 break;
1284
1285 if (entry->crc != crc)
1286 continue;
1287
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001288 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001289 continue;
1290
1291 /* this entry seems to match: same crc, not too old,
1292 * and from another gw. therefore return 1 to forbid it.
1293 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001294 ret = 1;
1295 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001296 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001297 /* not found, add a new entry (overwrite the oldest entry)
1298 * and allow it, its the first occurence.
1299 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001300 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001301 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001302 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001303 entry->crc = crc;
1304 entry->entrytime = jiffies;
1305 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001306 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001307
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001308out:
1309 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1310
1311 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001312}
1313
1314
1315
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001316/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001317 * @orig: originator mac address
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001318 * @vid: VLAN identifier
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001319 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001320 * Check if the originator is a gateway for the VLAN identified by vid.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001321 *
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001322 * Returns true if orig is a backbone for this vid, false otherwise.
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001323 */
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001324bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
1325 unsigned short vid)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001326{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001327 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001328 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001329 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001330 int i;
1331
1332 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001333 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001334
1335 if (!hash)
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001336 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001337
1338 for (i = 0; i < hash->size; i++) {
1339 head = &hash->table[i];
1340
1341 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001342 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001343 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1344 backbone_gw->vid == vid) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001345 rcu_read_unlock();
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001346 return true;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001347 }
1348 }
1349 rcu_read_unlock();
1350 }
1351
Antonio Quartullicfd4f752013-08-07 18:28:56 +02001352 return false;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001353}
1354
1355
Ben Hutchings2c530402012-07-10 10:55:09 +00001356/**
1357 * batadv_bla_is_backbone_gw
1358 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001359 * @orig_node: the orig_node of the frame
1360 * @hdr_size: maximum length of the frame
1361 *
1362 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1363 * if the orig_node is also a gateway on the soft interface, otherwise it
1364 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001365 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001366int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001367 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001368{
Marek Lindnerbae98772012-12-25 17:03:24 +08001369 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullic018ad32013-06-04 12:11:39 +02001370 unsigned short vid;
Simon Wunderlich23721382012-01-22 20:00:19 +01001371
1372 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1373 return 0;
1374
1375 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001376 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001377 return 0;
1378
Antonio Quartullic018ad32013-06-04 12:11:39 +02001379 vid = batadv_get_vid(skb, hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001380
1381 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001382 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1383 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001384 if (!backbone_gw)
1385 return 0;
1386
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001387 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001388 return 1;
1389}
1390
1391/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001392void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001393{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001394 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001395
Sven Eckelmann807736f2012-07-15 22:26:51 +02001396 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001397 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001398
Sven Eckelmann807736f2012-07-15 22:26:51 +02001399 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001400 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001401 batadv_hash_destroy(bat_priv->bla.claim_hash);
1402 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001403 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001404 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001405 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001406 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1407 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001408 }
1409 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001410 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001411}
1412
Ben Hutchings2c530402012-07-10 10:55:09 +00001413/**
1414 * batadv_bla_rx
1415 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001416 * @skb: the frame to be checked
1417 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001418 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001419 *
1420 * bla_rx avoidance checks if:
1421 * * we have to race for a claim
1422 * * if the frame is allowed on the LAN
1423 *
1424 * in these cases, the skb is further handled by this function and
1425 * returns 1, otherwise it returns 0 and the caller shall further
1426 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001427 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001428int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1429 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001430{
1431 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001432 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001433 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001434 int ret;
1435
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001436 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001437
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001438 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001439 if (!primary_if)
1440 goto handled;
1441
1442 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1443 goto allow;
1444
1445
Sven Eckelmann807736f2012-07-15 22:26:51 +02001446 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001447 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001448 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001449 goto handled;
1450
1451 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1452 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001453 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001454
1455 if (!claim) {
1456 /* possible optimization: race for a claim */
1457 /* No claim exists yet, claim it for us!
1458 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001459 batadv_handle_claim(bat_priv, primary_if,
1460 primary_if->net_dev->dev_addr,
1461 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001462 goto allow;
1463 }
1464
1465 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001466 if (batadv_compare_eth(claim->backbone_gw->orig,
1467 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001468 /* ... allow it in any case */
1469 claim->lasttime = jiffies;
1470 goto allow;
1471 }
1472
1473 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001474 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1475 /* ... drop it. the responsible gateway is in charge.
1476 *
1477 * We need to check is_bcast because with the gateway
1478 * feature, broadcasts (like DHCP requests) may be sent
1479 * using a unicast packet type.
1480 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001481 goto handled;
1482 } else {
1483 /* seems the client considers us as its best gateway.
1484 * send a claim and update the claim table
1485 * immediately.
1486 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001487 batadv_handle_claim(bat_priv, primary_if,
1488 primary_if->net_dev->dev_addr,
1489 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001490 goto allow;
1491 }
1492allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001493 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001494 ret = 0;
1495 goto out;
1496
1497handled:
1498 kfree_skb(skb);
1499 ret = 1;
1500
1501out:
1502 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001503 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001504 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001505 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001506 return ret;
1507}
1508
Ben Hutchings2c530402012-07-10 10:55:09 +00001509/**
1510 * batadv_bla_tx
1511 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001512 * @skb: the frame to be checked
1513 * @vid: the VLAN ID of the frame
1514 *
1515 * bla_tx checks if:
1516 * * a claim was received which has to be processed
1517 * * the frame is allowed on the mesh
1518 *
1519 * in these cases, the skb is further handled by this function and
1520 * returns 1, otherwise it returns 0 and the caller shall further
1521 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001522 *
1523 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001524 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001525int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1526 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001527{
1528 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001529 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001530 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001531 int ret = 0;
1532
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001533 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001534 if (!primary_if)
1535 goto out;
1536
1537 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1538 goto allow;
1539
1540 /* in VLAN case, the mac header might not be set. */
1541 skb_reset_mac_header(skb);
1542
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001543 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001544 goto handled;
1545
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001546 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001547
Sven Eckelmann807736f2012-07-15 22:26:51 +02001548 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001549 /* don't allow broadcasts while requests are in flight */
1550 if (is_multicast_ether_addr(ethhdr->h_dest))
1551 goto handled;
1552
1553 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1554 search_claim.vid = vid;
1555
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001556 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001557
1558 /* if no claim exists, allow it. */
1559 if (!claim)
1560 goto allow;
1561
1562 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001563 if (batadv_compare_eth(claim->backbone_gw->orig,
1564 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001565 /* if yes, the client has roamed and we have
1566 * to unclaim it.
1567 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001568 batadv_handle_unclaim(bat_priv, primary_if,
1569 primary_if->net_dev->dev_addr,
1570 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001571 goto allow;
1572 }
1573
1574 /* check if it is a multicast/broadcast frame */
1575 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1576 /* drop it. the responsible gateway has forwarded it into
1577 * the backbone network.
1578 */
1579 goto handled;
1580 } else {
1581 /* we must allow it. at least if we are
1582 * responsible for the DESTINATION.
1583 */
1584 goto allow;
1585 }
1586allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001587 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001588 ret = 0;
1589 goto out;
1590handled:
1591 ret = 1;
1592out:
1593 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001594 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001595 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001596 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001597 return ret;
1598}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001599
Sven Eckelmann08adf152012-05-12 13:38:47 +02001600int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001601{
1602 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001603 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001604 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001605 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001606 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001607 struct hlist_head *head;
1608 uint32_t i;
1609 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001610 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001611
Marek Lindner30da63a2012-08-03 17:15:46 +02001612 primary_if = batadv_seq_print_text_primary_if_get(seq);
1613 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001614 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001615
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001616 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001617 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001618 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001619 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001620 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001621 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001622 "Client", "VID", "Originator", "CRC");
1623 for (i = 0; i < hash->size; i++) {
1624 head = &hash->table[i];
1625
1626 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001627 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001628 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1629 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001630 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001631 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001632 claim->backbone_gw->orig,
1633 (is_own ? 'x' : ' '),
1634 claim->backbone_gw->crc);
1635 }
1636 rcu_read_unlock();
1637 }
1638out:
1639 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001640 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001641 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001643
1644int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1645{
1646 struct net_device *net_dev = (struct net_device *)seq->private;
1647 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001648 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001649 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001650 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001651 struct hlist_head *head;
1652 int secs, msecs;
1653 uint32_t i;
1654 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001655 uint8_t *primary_addr;
1656
Marek Lindner30da63a2012-08-03 17:15:46 +02001657 primary_if = batadv_seq_print_text_primary_if_get(seq);
1658 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001659 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001660
1661 primary_addr = primary_if->net_dev->dev_addr;
1662 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001663 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001664 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001665 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001666 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001667 "Originator", "VID", "last seen", "CRC");
1668 for (i = 0; i < hash->size; i++) {
1669 head = &hash->table[i];
1670
1671 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001672 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001673 msecs = jiffies_to_msecs(jiffies -
1674 backbone_gw->lasttime);
1675 secs = msecs / 1000;
1676 msecs = msecs % 1000;
1677
1678 is_own = batadv_compare_eth(backbone_gw->orig,
1679 primary_addr);
1680 if (is_own)
1681 continue;
1682
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001683 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001684 backbone_gw->orig,
1685 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001686 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001687 }
1688 rcu_read_unlock();
1689 }
1690out:
1691 if (primary_if)
1692 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001693 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001694}