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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
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100414 /* this is a gateway now, remove any tt entries */
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) {
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200417 batadv_tt_global_del_orig(bat_priv, orig_node,
418 "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{
861 struct ethhdr *ethhdr;
862 struct vlan_ethhdr *vhdr;
863 struct arphdr *arphdr;
864 uint8_t *hw_src, *hw_dst;
Sven Eckelmann96412692012-06-05 22:31:30 +0200865 struct batadv_bla_claim_dst *bla_dst;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200866 __be16 proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100867 int headlen;
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200868 unsigned short vid = BATADV_NO_FLAGS;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100869 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100870
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200871 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100872
Antonio Quartulli293e9332013-05-19 12:55:16 +0200873 if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
Simon Wunderlich23721382012-01-22 20:00:19 +0100874 vhdr = (struct vlan_ethhdr *)ethhdr;
875 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
Antonio Quartullieb2deb62013-04-19 18:07:00 +0200876 vid |= BATADV_VLAN_HAS_TAG;
Antonio Quartulli293e9332013-05-19 12:55:16 +0200877 proto = vhdr->h_vlan_encapsulated_proto;
Simon Wunderlich23721382012-01-22 20:00:19 +0100878 headlen = sizeof(*vhdr);
879 } else {
Antonio Quartulli293e9332013-05-19 12:55:16 +0200880 proto = ethhdr->h_proto;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100881 headlen = ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100882 }
883
Antonio Quartulli293e9332013-05-19 12:55:16 +0200884 if (proto != htons(ETH_P_ARP))
Simon Wunderlich23721382012-01-22 20:00:19 +0100885 return 0; /* not a claim frame */
886
887 /* this must be a ARP frame. check if it is a claim. */
888
889 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
890 return 0;
891
892 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
Antonio Quartulli7ed4be92013-04-08 15:08:18 +0200893 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +0100894 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
895
896 /* Check whether the ARP frame carries a valid
897 * IP information
898 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100899 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
900 return 0;
901 if (arphdr->ar_pro != htons(ETH_P_IP))
902 return 0;
903 if (arphdr->ar_hln != ETH_ALEN)
904 return 0;
905 if (arphdr->ar_pln != 4)
906 return 0;
907
908 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
909 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200910 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100911
912 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200913 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
914 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100915 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200916 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200917 "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 +0200918 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
919 hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100920
921 if (ret < 2)
922 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100923
924 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200925 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100926
927 /* check for the different types of claim frames ... */
928 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200929 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200930 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
931 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100932 return 1;
933 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200934 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200935 if (batadv_handle_unclaim(bat_priv, primary_if,
936 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100937 return 1;
938 break;
939
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200940 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200941 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
942 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100943 return 1;
944 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200945 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200946 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
947 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100948 return 1;
949 break;
950 }
951
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200952 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200953 "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 +0200954 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100955 return 1;
956}
957
958/* Check when we last heard from other nodes, and remove them in case of
959 * a time out, or clean all backbone gws if now is set.
960 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200961static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100962{
Marek Lindnerbae98772012-12-25 17:03:24 +0800963 struct batadv_bla_backbone_gw *backbone_gw;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800964 struct hlist_node *node_tmp;
Simon Wunderlich23721382012-01-22 20:00:19 +0100965 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200966 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100967 spinlock_t *list_lock; /* protects write access to the hash lists */
968 int i;
969
Sven Eckelmann807736f2012-07-15 22:26:51 +0200970 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100971 if (!hash)
972 return;
973
974 for (i = 0; i < hash->size; i++) {
975 head = &hash->table[i];
976 list_lock = &hash->list_locks[i];
977
978 spin_lock_bh(list_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800979 hlist_for_each_entry_safe(backbone_gw, node_tmp,
Simon Wunderlich23721382012-01-22 20:00:19 +0100980 head, hash_entry) {
981 if (now)
982 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200983 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200984 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +0100985 continue;
986
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200987 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200988 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
989 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100990
991purge_now:
992 /* don't wait for the pending request anymore */
993 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +0200994 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100995
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200996 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100997
Sasha Levinb67bfe02013-02-27 17:06:00 -0800998 hlist_del_rcu(&backbone_gw->hash_entry);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200999 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001000 }
1001 spin_unlock_bh(list_lock);
1002 }
1003}
1004
Ben Hutchings2c530402012-07-10 10:55:09 +00001005/**
1006 * batadv_bla_purge_claims
1007 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001008 * @primary_if: the selected primary interface, may be NULL if now is set
1009 * @now: whether the whole hash shall be wiped now
1010 *
1011 * Check when we heard last time from our own claims, and remove them in case of
1012 * a time out, or clean all claims if now is set
1013 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001014static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1015 struct batadv_hard_iface *primary_if,
1016 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +01001017{
Marek Lindner712bbfe42012-12-25 17:03:25 +08001018 struct batadv_bla_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001019 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001020 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001021 int i;
1022
Sven Eckelmann807736f2012-07-15 22:26:51 +02001023 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001024 if (!hash)
1025 return;
1026
1027 for (i = 0; i < hash->size; i++) {
1028 head = &hash->table[i];
1029
1030 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001031 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001032 if (now)
1033 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001034 if (!batadv_compare_eth(claim->backbone_gw->orig,
1035 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001036 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001037 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001038 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001039 continue;
1040
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001041 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001042 "bla_purge_claims(): %pM, vid %d, time out\n",
1043 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001044
1045purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001046 batadv_handle_unclaim(bat_priv, primary_if,
1047 claim->backbone_gw->orig,
1048 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001049 }
1050 rcu_read_unlock();
1051 }
1052}
1053
Ben Hutchings2c530402012-07-10 10:55:09 +00001054/**
1055 * batadv_bla_update_orig_address
1056 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001057 * @primary_if: the new selected primary_if
1058 * @oldif: the old primary interface, may be NULL
1059 *
1060 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001061 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001062void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1063 struct batadv_hard_iface *primary_if,
1064 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001065{
Marek Lindnerbae98772012-12-25 17:03:24 +08001066 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001067 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001068 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001069 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001070 int i;
1071
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001072 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001073 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1074 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001075
Simon Wunderlichd5b4c932013-06-07 16:52:05 +02001076 /* purge everything when bridge loop avoidance is turned off */
1077 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1078 oldif = NULL;
1079
Simon Wunderlich23721382012-01-22 20:00:19 +01001080 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001081 batadv_bla_purge_claims(bat_priv, NULL, 1);
1082 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001083 return;
1084 }
1085
Sven Eckelmann807736f2012-07-15 22:26:51 +02001086 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001087 if (!hash)
1088 return;
1089
1090 for (i = 0; i < hash->size; i++) {
1091 head = &hash->table[i];
1092
1093 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001094 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001095 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001096 if (!batadv_compare_eth(backbone_gw->orig,
1097 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001098 continue;
1099
1100 memcpy(backbone_gw->orig,
1101 primary_if->net_dev->dev_addr, ETH_ALEN);
1102 /* send an announce frame so others will ask for our
1103 * claims and update their tables.
1104 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001105 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001106 }
1107 rcu_read_unlock();
1108 }
1109}
1110
Simon Wunderlich23721382012-01-22 20:00:19 +01001111/* periodic work to do:
1112 * * purge structures when they are too old
1113 * * send announcements
1114 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001115static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001116{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001117 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001118 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001119 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001120 struct hlist_head *head;
Marek Lindnerbae98772012-12-25 17:03:24 +08001121 struct batadv_bla_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001122 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001123 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001124 int i;
1125
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001126 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001127 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1128 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001129 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001130 if (!primary_if)
1131 goto out;
1132
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001133 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1134 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001135
1136 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1137 goto out;
1138
Sven Eckelmann807736f2012-07-15 22:26:51 +02001139 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001140 if (!hash)
1141 goto out;
1142
1143 for (i = 0; i < hash->size; i++) {
1144 head = &hash->table[i];
1145
1146 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001147 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001148 if (!batadv_compare_eth(backbone_gw->orig,
1149 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001150 continue;
1151
1152 backbone_gw->lasttime = jiffies;
1153
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001154 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001155
1156 /* request_sent is only set after creation to avoid
1157 * problems when we are not yet known as backbone gw
1158 * in the backbone.
1159 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001160 * We can reset this now after we waited some periods
1161 * to give bridge forward delays and bla group forming
1162 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001163 */
1164
1165 if (atomic_read(&backbone_gw->request_sent) == 0)
1166 continue;
1167
Simon Wunderlich28709872012-09-13 18:18:46 +02001168 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1169 continue;
1170
Simon Wunderlichd807f272012-09-09 22:27:57 +02001171 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1172 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001173 }
1174 rcu_read_unlock();
1175 }
1176out:
1177 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001178 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001179
Antonio Quartulli72414442012-12-25 13:14:37 +01001180 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1181 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001182}
1183
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001184/* The hash for claim and backbone hash receive the same key because they
1185 * are getting initialized by hash_new with the same key. Reinitializing
1186 * them with to different keys to allow nested locking without generating
1187 * lockdep warnings
1188 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001189static struct lock_class_key batadv_claim_hash_lock_class_key;
1190static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001191
Simon Wunderlich23721382012-01-22 20:00:19 +01001192/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001193int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001194{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001195 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001196 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001197 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001198 uint16_t crc;
1199 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001200
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001201 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1202
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001203 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001204
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001205 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001206 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1207 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001208 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001209 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001210 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1211 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001212 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001213 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001214 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001215 }
1216
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001217 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001218 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001219 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001220 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1221 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001222
Sven Eckelmann807736f2012-07-15 22:26:51 +02001223 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001224 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001225
Sven Eckelmann807736f2012-07-15 22:26:51 +02001226 bat_priv->bla.claim_hash = batadv_hash_new(128);
1227 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001228
Sven Eckelmann807736f2012-07-15 22:26:51 +02001229 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001230 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001231
Sven Eckelmann807736f2012-07-15 22:26:51 +02001232 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001233 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001234 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001235 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001236
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001237 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001238
Antonio Quartulli72414442012-12-25 13:14:37 +01001239 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1240
1241 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1242 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Sven Eckelmann5346c352012-05-05 13:27:28 +02001243 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001244}
1245
Ben Hutchings2c530402012-07-10 10:55:09 +00001246/**
1247 * batadv_bla_check_bcast_duplist
1248 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001249 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001250 *
1251 * check if it is on our broadcast list. Another gateway might
1252 * have sent the same packet because it is connected to the same backbone,
1253 * so we have to remove this duplicate.
1254 *
1255 * This is performed by checking the CRC, which will tell us
1256 * with a good chance that it is the same packet. If it is furthermore
1257 * sent by another host, drop it. We allow equal packets from
1258 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001259 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001260int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001261 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001262{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001263 int i, curr, ret = 0;
1264 __be32 crc;
1265 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001266 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001267
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001268 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001269
1270 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001271 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001272
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001273 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1274
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001275 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001276 curr = (bat_priv->bla.bcast_duplist_curr + i);
1277 curr %= BATADV_DUPLIST_SIZE;
1278 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001279
1280 /* we can stop searching if the entry is too old ;
1281 * later entries will be even older
1282 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001283 if (batadv_has_timed_out(entry->entrytime,
1284 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001285 break;
1286
1287 if (entry->crc != crc)
1288 continue;
1289
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001290 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001291 continue;
1292
1293 /* this entry seems to match: same crc, not too old,
1294 * and from another gw. therefore return 1 to forbid it.
1295 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001296 ret = 1;
1297 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001298 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001299 /* not found, add a new entry (overwrite the oldest entry)
1300 * and allow it, its the first occurence.
1301 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001302 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001303 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001304 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001305 entry->crc = crc;
1306 entry->entrytime = jiffies;
1307 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001308 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001309
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001310out:
1311 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1312
1313 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001314}
1315
1316
1317
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001318/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001319 * @orig: originator mac address
1320 *
1321 * check if the originator is a gateway for any VLAN ID.
1322 *
1323 * returns 1 if it is found, 0 otherwise
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001324 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001325int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
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))
1333 return 0;
1334
1335 if (!hash)
1336 return 0;
1337
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) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001343 if (batadv_compare_eth(backbone_gw->orig, orig)) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001344 rcu_read_unlock();
1345 return 1;
1346 }
1347 }
1348 rcu_read_unlock();
1349 }
1350
1351 return 0;
1352}
1353
1354
Ben Hutchings2c530402012-07-10 10:55:09 +00001355/**
1356 * batadv_bla_is_backbone_gw
1357 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001358 * @orig_node: the orig_node of the frame
1359 * @hdr_size: maximum length of the frame
1360 *
1361 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1362 * if the orig_node is also a gateway on the soft interface, otherwise it
1363 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001364 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001365int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001366 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001367{
1368 struct ethhdr *ethhdr;
1369 struct vlan_ethhdr *vhdr;
Marek Lindnerbae98772012-12-25 17:03:24 +08001370 struct batadv_bla_backbone_gw *backbone_gw;
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001371 unsigned short vid = BATADV_NO_FLAGS;
Simon Wunderlich23721382012-01-22 20:00:19 +01001372
1373 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1374 return 0;
1375
1376 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001377 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001378 return 0;
1379
1380 ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
1381
Antonio Quartulli293e9332013-05-19 12:55:16 +02001382 if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
Antonio Quartulli2c598662013-05-12 21:57:09 +02001383 if (!pskb_may_pull(skb, hdr_size + VLAN_ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001384 return 0;
1385
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001386 vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001387 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001388 vid |= BATADV_VLAN_HAS_TAG;
Simon Wunderlich23721382012-01-22 20:00:19 +01001389 }
1390
1391 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001392 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1393 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001394 if (!backbone_gw)
1395 return 0;
1396
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001397 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001398 return 1;
1399}
1400
1401/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001402void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001403{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001404 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001405
Sven Eckelmann807736f2012-07-15 22:26:51 +02001406 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001407 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001408
Sven Eckelmann807736f2012-07-15 22:26:51 +02001409 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001410 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001411 batadv_hash_destroy(bat_priv->bla.claim_hash);
1412 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001413 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001414 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001415 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001416 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1417 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001418 }
1419 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001420 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001421}
1422
Ben Hutchings2c530402012-07-10 10:55:09 +00001423/**
1424 * batadv_bla_rx
1425 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001426 * @skb: the frame to be checked
1427 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001428 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001429 *
1430 * bla_rx avoidance checks if:
1431 * * we have to race for a claim
1432 * * if the frame is allowed on the LAN
1433 *
1434 * in these cases, the skb is further handled by this function and
1435 * returns 1, otherwise it returns 0 and the caller shall further
1436 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001437 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001438int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1439 unsigned short vid, bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001440{
1441 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001442 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001443 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001444 int ret;
1445
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001446 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001447
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001448 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001449 if (!primary_if)
1450 goto handled;
1451
1452 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1453 goto allow;
1454
1455
Sven Eckelmann807736f2012-07-15 22:26:51 +02001456 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001457 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001458 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001459 goto handled;
1460
1461 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1462 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001463 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001464
1465 if (!claim) {
1466 /* possible optimization: race for a claim */
1467 /* No claim exists yet, claim it for us!
1468 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001469 batadv_handle_claim(bat_priv, primary_if,
1470 primary_if->net_dev->dev_addr,
1471 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001472 goto allow;
1473 }
1474
1475 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001476 if (batadv_compare_eth(claim->backbone_gw->orig,
1477 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001478 /* ... allow it in any case */
1479 claim->lasttime = jiffies;
1480 goto allow;
1481 }
1482
1483 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001484 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1485 /* ... drop it. the responsible gateway is in charge.
1486 *
1487 * We need to check is_bcast because with the gateway
1488 * feature, broadcasts (like DHCP requests) may be sent
1489 * using a unicast packet type.
1490 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001491 goto handled;
1492 } else {
1493 /* seems the client considers us as its best gateway.
1494 * send a claim and update the claim table
1495 * immediately.
1496 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001497 batadv_handle_claim(bat_priv, primary_if,
1498 primary_if->net_dev->dev_addr,
1499 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001500 goto allow;
1501 }
1502allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001503 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001504 ret = 0;
1505 goto out;
1506
1507handled:
1508 kfree_skb(skb);
1509 ret = 1;
1510
1511out:
1512 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001513 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001514 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001515 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001516 return ret;
1517}
1518
Ben Hutchings2c530402012-07-10 10:55:09 +00001519/**
1520 * batadv_bla_tx
1521 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001522 * @skb: the frame to be checked
1523 * @vid: the VLAN ID of the frame
1524 *
1525 * bla_tx checks if:
1526 * * a claim was received which has to be processed
1527 * * the frame is allowed on the mesh
1528 *
1529 * in these cases, the skb is further handled by this function and
1530 * returns 1, otherwise it returns 0 and the caller shall further
1531 * process the skb.
Linus Lüssing9d2c9482013-08-06 20:21:15 +02001532 *
1533 * This call might reallocate skb data.
Simon Wunderlich23721382012-01-22 20:00:19 +01001534 */
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001535int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1536 unsigned short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001537{
1538 struct ethhdr *ethhdr;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001539 struct batadv_bla_claim search_claim, *claim = NULL;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001540 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001541 int ret = 0;
1542
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001543 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001544 if (!primary_if)
1545 goto out;
1546
1547 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1548 goto allow;
1549
1550 /* in VLAN case, the mac header might not be set. */
1551 skb_reset_mac_header(skb);
1552
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001553 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001554 goto handled;
1555
Antonio Quartulli7ed4be92013-04-08 15:08:18 +02001556 ethhdr = eth_hdr(skb);
Simon Wunderlich23721382012-01-22 20:00:19 +01001557
Sven Eckelmann807736f2012-07-15 22:26:51 +02001558 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001559 /* don't allow broadcasts while requests are in flight */
1560 if (is_multicast_ether_addr(ethhdr->h_dest))
1561 goto handled;
1562
1563 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1564 search_claim.vid = vid;
1565
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001566 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001567
1568 /* if no claim exists, allow it. */
1569 if (!claim)
1570 goto allow;
1571
1572 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001573 if (batadv_compare_eth(claim->backbone_gw->orig,
1574 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001575 /* if yes, the client has roamed and we have
1576 * to unclaim it.
1577 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001578 batadv_handle_unclaim(bat_priv, primary_if,
1579 primary_if->net_dev->dev_addr,
1580 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001581 goto allow;
1582 }
1583
1584 /* check if it is a multicast/broadcast frame */
1585 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1586 /* drop it. the responsible gateway has forwarded it into
1587 * the backbone network.
1588 */
1589 goto handled;
1590 } else {
1591 /* we must allow it. at least if we are
1592 * responsible for the DESTINATION.
1593 */
1594 goto allow;
1595 }
1596allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001597 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001598 ret = 0;
1599 goto out;
1600handled:
1601 ret = 1;
1602out:
1603 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001604 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001605 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001606 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001607 return ret;
1608}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001609
Sven Eckelmann08adf152012-05-12 13:38:47 +02001610int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001611{
1612 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001613 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001614 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Marek Lindner712bbfe42012-12-25 17:03:25 +08001615 struct batadv_bla_claim *claim;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001616 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001617 struct hlist_head *head;
1618 uint32_t i;
1619 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001620 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001621
Marek Lindner30da63a2012-08-03 17:15:46 +02001622 primary_if = batadv_seq_print_text_primary_if_get(seq);
1623 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001624 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001625
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001626 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001627 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001628 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001629 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001630 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001631 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001632 "Client", "VID", "Originator", "CRC");
1633 for (i = 0; i < hash->size; i++) {
1634 head = &hash->table[i];
1635
1636 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001637 hlist_for_each_entry_rcu(claim, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001638 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1639 primary_addr);
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001640 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001641 claim->addr, BATADV_PRINT_VID(claim->vid),
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642 claim->backbone_gw->orig,
1643 (is_own ? 'x' : ' '),
1644 claim->backbone_gw->crc);
1645 }
1646 rcu_read_unlock();
1647 }
1648out:
1649 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001650 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001651 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001652}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001653
1654int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1655{
1656 struct net_device *net_dev = (struct net_device *)seq->private;
1657 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001658 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Marek Lindnerbae98772012-12-25 17:03:24 +08001659 struct batadv_bla_backbone_gw *backbone_gw;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001660 struct batadv_hard_iface *primary_if;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001661 struct hlist_head *head;
1662 int secs, msecs;
1663 uint32_t i;
1664 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001665 uint8_t *primary_addr;
1666
Marek Lindner30da63a2012-08-03 17:15:46 +02001667 primary_if = batadv_seq_print_text_primary_if_get(seq);
1668 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001669 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001670
1671 primary_addr = primary_if->net_dev->dev_addr;
1672 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001673 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001674 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001675 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001676 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001677 "Originator", "VID", "last seen", "CRC");
1678 for (i = 0; i < hash->size; i++) {
1679 head = &hash->table[i];
1680
1681 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001682 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001683 msecs = jiffies_to_msecs(jiffies -
1684 backbone_gw->lasttime);
1685 secs = msecs / 1000;
1686 msecs = msecs % 1000;
1687
1688 is_own = batadv_compare_eth(backbone_gw->orig,
1689 primary_addr);
1690 if (is_own)
1691 continue;
1692
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001693 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
Antonio Quartulli5f80df62013-04-19 18:07:01 +02001694 backbone_gw->orig,
1695 BATADV_PRINT_VID(backbone_gw->vid), secs,
Antonio Quartullieb2deb62013-04-19 18:07:00 +02001696 msecs, backbone_gw->crc);
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001697 }
1698 rcu_read_unlock();
1699 }
1700out:
1701 if (primary_if)
1702 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001703 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001704}