blob: ec12c79104ec4a3cb538a8ebeae0161c542a82ee [file] [log] [blame]
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001/* Copyright (C) 2011-2012 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);
Sven Eckelmann56303d32012-06-05 22:31:31 +020037static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
38 struct batadv_backbone_gw *backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +010039
40/* return the index of the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020041static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010042{
Simon Wunderlich07568d02012-08-30 18:22:27 +020043 struct batadv_claim *claim = (struct batadv_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010044 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010045
Simon Wunderlich07568d02012-08-30 18:22:27 +020046 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
47 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010048
49 hash += (hash << 3);
50 hash ^= (hash >> 11);
51 hash += (hash << 15);
52
53 return hash % size;
54}
55
56/* return the index of the backbone gateway */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020057static inline uint32_t batadv_choose_backbone_gw(const void *data,
58 uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010059{
Simon Wunderlich07568d02012-08-30 18:22:27 +020060 struct batadv_claim *claim = (struct batadv_claim *)data;
Simon Wunderlich23721382012-01-22 20:00:19 +010061 uint32_t hash = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +010062
Simon Wunderlich07568d02012-08-30 18:22:27 +020063 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
64 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
Simon Wunderlich23721382012-01-22 20:00:19 +010065
66 hash += (hash << 3);
67 hash ^= (hash >> 11);
68 hash += (hash << 15);
69
70 return hash % size;
71}
72
73
74/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020075static int batadv_compare_backbone_gw(const struct hlist_node *node,
76 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010077{
Sven Eckelmann56303d32012-06-05 22:31:31 +020078 const void *data1 = container_of(node, struct batadv_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010079 hash_entry);
Simon Wunderlichc76d1522012-10-15 22:38:04 +020080 const struct batadv_backbone_gw *gw1 = data1, *gw2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010081
Simon Wunderlichc76d1522012-10-15 22:38:04 +020082 if (!batadv_compare_eth(gw1->orig, gw2->orig))
83 return 0;
84
85 if (gw1->vid != gw2->vid)
86 return 0;
87
88 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +010089}
90
91/* compares address and vid of two claims */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020092static int batadv_compare_claim(const struct hlist_node *node,
93 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010094{
Sven Eckelmann56303d32012-06-05 22:31:31 +020095 const void *data1 = container_of(node, struct batadv_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +010096 hash_entry);
Simon Wunderlichc76d1522012-10-15 22:38:04 +020097 const struct batadv_claim *cl1 = data1, *cl2 = data2;
Simon Wunderlich23721382012-01-22 20:00:19 +010098
Simon Wunderlichc76d1522012-10-15 22:38:04 +020099 if (!batadv_compare_eth(cl1->addr, cl2->addr))
100 return 0;
101
102 if (cl1->vid != cl2->vid)
103 return 0;
104
105 return 1;
Simon Wunderlich23721382012-01-22 20:00:19 +0100106}
107
108/* free a backbone gw */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200109static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100110{
111 if (atomic_dec_and_test(&backbone_gw->refcount))
112 kfree_rcu(backbone_gw, rcu);
113}
114
115/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200116static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100117{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200118 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100119
Sven Eckelmann56303d32012-06-05 22:31:31 +0200120 claim = container_of(rcu, struct batadv_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100121
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200122 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100123 kfree(claim);
124}
125
126/* free a claim, call claim_free_rcu if its the last reference */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200127static void batadv_claim_free_ref(struct batadv_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100128{
129 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200130 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100131}
132
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200133/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100134 * @data: search data (may be local/static data)
135 *
136 * looks for a claim in the hash, and returns it if found
137 * or NULL otherwise.
138 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200139static struct batadv_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv,
140 struct batadv_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100141{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200142 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100143 struct hlist_head *head;
144 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200145 struct batadv_claim *claim;
146 struct batadv_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100147 int index;
148
149 if (!hash)
150 return NULL;
151
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200152 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100153 head = &hash->table[index];
154
155 rcu_read_lock();
156 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200157 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100158 continue;
159
160 if (!atomic_inc_not_zero(&claim->refcount))
161 continue;
162
163 claim_tmp = claim;
164 break;
165 }
166 rcu_read_unlock();
167
168 return claim_tmp;
169}
170
Ben Hutchings2c530402012-07-10 10:55:09 +0000171/**
172 * batadv_backbone_hash_find - looks for a claim in the hash
173 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100174 * @addr: the address of the originator
175 * @vid: the VLAN ID
176 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000177 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100178 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200179static struct batadv_backbone_gw *
180batadv_backbone_hash_find(struct batadv_priv *bat_priv,
181 uint8_t *addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100182{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200183 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100184 struct hlist_head *head;
185 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200186 struct batadv_backbone_gw search_entry, *backbone_gw;
187 struct batadv_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100188 int index;
189
190 if (!hash)
191 return NULL;
192
193 memcpy(search_entry.orig, addr, ETH_ALEN);
194 search_entry.vid = vid;
195
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200196 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100197 head = &hash->table[index];
198
199 rcu_read_lock();
200 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200201 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
202 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100203 continue;
204
205 if (!atomic_inc_not_zero(&backbone_gw->refcount))
206 continue;
207
208 backbone_gw_tmp = backbone_gw;
209 break;
210 }
211 rcu_read_unlock();
212
213 return backbone_gw_tmp;
214}
215
216/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200217static void
218batadv_bla_del_backbone_claims(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100219{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200220 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100221 struct hlist_node *node, *node_tmp;
222 struct hlist_head *head;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200223 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100224 int i;
225 spinlock_t *list_lock; /* protects write access to the hash lists */
226
Sven Eckelmann807736f2012-07-15 22:26:51 +0200227 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100228 if (!hash)
229 return;
230
231 for (i = 0; i < hash->size; i++) {
232 head = &hash->table[i];
233 list_lock = &hash->list_locks[i];
234
235 spin_lock_bh(list_lock);
236 hlist_for_each_entry_safe(claim, node, node_tmp,
237 head, hash_entry) {
238
239 if (claim->backbone_gw != backbone_gw)
240 continue;
241
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200242 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100243 hlist_del_rcu(node);
244 }
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,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200260 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,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200310 "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100311 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200312 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100313 /* unclaim frame
314 * set HW SRC to the clients mac
315 */
316 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200317 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200318 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
319 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100320 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200321 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100322 /* announcement frame
323 * set HW SRC to the special mac containg the crc
324 */
325 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200326 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200327 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
328 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100329 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200330 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100331 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200332 * set HW SRC and header destination to the receiving backbone
333 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100334 */
335 memcpy(hw_src, mac, ETH_ALEN);
336 memcpy(ethhdr->h_dest, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200337 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200338 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
339 ethhdr->h_source, ethhdr->h_dest, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100340 break;
341
342 }
343
344 if (vid != -1)
345 skb = vlan_insert_tag(skb, vid);
346
347 skb_reset_mac_header(skb);
348 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200349 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
350 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
351 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100352 soft_iface->last_rx = jiffies;
353
354 netif_rx(skb);
355out:
356 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200357 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100358}
359
Ben Hutchings2c530402012-07-10 10:55:09 +0000360/**
361 * batadv_bla_get_backbone_gw
362 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100363 * @orig: the mac address of the originator
364 * @vid: the VLAN ID
365 *
366 * searches for the backbone gw or creates a new one if it could not
367 * be found.
368 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200369static struct batadv_backbone_gw *
370batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200371 short vid, bool own_backbone)
Simon Wunderlich23721382012-01-22 20:00:19 +0100372{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200373 struct batadv_backbone_gw *entry;
374 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100375 int hash_added;
376
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200377 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100378
379 if (entry)
380 return entry;
381
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200382 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200383 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
384 orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100385
386 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
387 if (!entry)
388 return NULL;
389
390 entry->vid = vid;
391 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200392 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100393 entry->bat_priv = bat_priv;
394 atomic_set(&entry->request_sent, 0);
Simon Wunderlich28709872012-09-13 18:18:46 +0200395 atomic_set(&entry->wait_periods, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +0100396 memcpy(entry->orig, orig, ETH_ALEN);
397
398 /* one for the hash, one for returning */
399 atomic_set(&entry->refcount, 2);
400
Sven Eckelmann807736f2012-07-15 22:26:51 +0200401 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200402 batadv_compare_backbone_gw,
403 batadv_choose_backbone_gw, entry,
404 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100405
406 if (unlikely(hash_added != 0)) {
407 /* hash failed, free the structure */
408 kfree(entry);
409 return NULL;
410 }
411
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100412 /* this is a gateway now, remove any tt entries */
Sven Eckelmannda641192012-05-12 13:48:56 +0200413 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100414 if (orig_node) {
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200415 batadv_tt_global_del_orig(bat_priv, orig_node,
416 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200417 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100418 }
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200419
Simon Wunderlichd807f272012-09-09 22:27:57 +0200420 if (own_backbone) {
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200421 batadv_bla_send_announce(bat_priv, entry);
422
Simon Wunderlichd807f272012-09-09 22:27:57 +0200423 /* this will be decreased in the worker thread */
424 atomic_inc(&entry->request_sent);
Simon Wunderlich28709872012-09-13 18:18:46 +0200425 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
Simon Wunderlichd807f272012-09-09 22:27:57 +0200426 atomic_inc(&bat_priv->bla.num_requests);
427 }
428
Simon Wunderlich23721382012-01-22 20:00:19 +0100429 return entry;
430}
431
432/* update or add the own backbone gw to make sure we announce
433 * where we receive other backbone gws
434 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200435static void
436batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
437 struct batadv_hard_iface *primary_if,
438 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100439{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200440 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100441
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200442 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
443 primary_if->net_dev->dev_addr,
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200444 vid, true);
Simon Wunderlich23721382012-01-22 20:00:19 +0100445 if (unlikely(!backbone_gw))
446 return;
447
448 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200449 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100450}
451
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200452/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100453 * @vid: the vid where the request came on
454 *
455 * Repeat all of our own claims, and finally send an ANNOUNCE frame
456 * to allow the requester another check if the CRC is correct now.
457 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200458static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
459 struct batadv_hard_iface *primary_if,
460 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100461{
462 struct hlist_node *node;
463 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200464 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200465 struct batadv_claim *claim;
466 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100467 int i;
468
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200469 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200470 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100471
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200472 backbone_gw = batadv_backbone_hash_find(bat_priv,
473 primary_if->net_dev->dev_addr,
474 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100475 if (!backbone_gw)
476 return;
477
Sven Eckelmann807736f2012-07-15 22:26:51 +0200478 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100479 for (i = 0; i < hash->size; i++) {
480 head = &hash->table[i];
481
482 rcu_read_lock();
483 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
484 /* only own claims are interesting */
485 if (claim->backbone_gw != backbone_gw)
486 continue;
487
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200488 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200489 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100490 }
491 rcu_read_unlock();
492 }
493
494 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200495 batadv_bla_send_announce(bat_priv, backbone_gw);
496 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100497}
498
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200499/* @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100500 *
501 * When the crc is wrong, ask the backbone gateway for a full table update.
502 * After the request, it will repeat all of his own claims and finally
503 * send an announcement claim with which we can check again.
504 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200505static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100506{
507 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200508 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100509
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200510 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
511 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100512
513 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200514 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200515 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100516
517 /* no local broadcasts should be sent or received, for now. */
518 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200519 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100520 atomic_set(&backbone_gw->request_sent, 1);
521 }
522}
523
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200524/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100525 * @backbone_gw: our backbone gateway which should be announced
526 *
527 * This function sends an announcement. It is called from multiple
528 * places.
529 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200530static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
531 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100532{
533 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100534 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100535
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200536 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100537 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100538 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100539
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200540 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200541 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100542
543}
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,
553 const uint8_t *mac, const short vid,
554 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100555{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200556 struct batadv_claim *claim;
557 struct batadv_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",
578 mac, 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",
597 mac, 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 }
603 /* set (new) backbone gw */
604 atomic_inc(&backbone_gw->refcount);
605 claim->backbone_gw = backbone_gw;
606
607 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
608 backbone_gw->lasttime = jiffies;
609
610claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200611 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100612}
613
614/* Delete a claim from the claim hash which has the
615 * given mac address and vid.
616 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200617static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
618 const uint8_t *mac, const short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100619{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200620 struct batadv_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100621
622 memcpy(search_claim.addr, mac, ETH_ALEN);
623 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200624 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100625 if (!claim)
626 return;
627
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200628 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
629 mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100630
Sven Eckelmann807736f2012-07-15 22:26:51 +0200631 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200632 batadv_choose_claim, claim);
633 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100634
635 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
636
637 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200638 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100639}
640
641/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200642static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200643 uint8_t *an_addr, uint8_t *backbone_addr,
644 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100645{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200646 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100647 uint16_t crc;
648
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200649 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100650 return 0;
651
Simon Wunderlich52aebd62012-09-08 18:02:53 +0200652 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
653 false);
Simon Wunderlich23721382012-01-22 20:00:19 +0100654
655 if (unlikely(!backbone_gw))
656 return 1;
657
658
659 /* handle as ANNOUNCE frame */
660 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100661 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100662
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200663 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100664 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200665 vid, backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100666
667 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200668 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Antonio Quartulli39a32992012-11-19 09:01:43 +0100669 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200670 backbone_gw->orig, backbone_gw->vid,
671 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,
692 struct ethhdr *ethhdr, 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",
706 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,
716 uint8_t *claim_addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100717{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200718 struct batadv_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",
734 claim_addr, 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,
745 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100746{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200747 struct batadv_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;
Simon Wunderlich23721382012-01-22 20:00:19 +0100866 uint16_t proto;
867 int headlen;
868 short vid = -1;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100869 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100870
871 ethhdr = (struct ethhdr *)skb_mac_header(skb);
872
873 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
874 vhdr = (struct vlan_ethhdr *)ethhdr;
875 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
876 proto = ntohs(vhdr->h_vlan_encapsulated_proto);
877 headlen = sizeof(*vhdr);
878 } else {
879 proto = ntohs(ethhdr->h_proto);
Antonio Quartulli0d125072012-02-18 11:27:34 +0100880 headlen = ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100881 }
882
883 if (proto != ETH_P_ARP)
884 return 0; /* not a claim frame */
885
886 /* this must be a ARP frame. check if it is a claim. */
887
888 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
889 return 0;
890
891 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
892 ethhdr = (struct ethhdr *)skb_mac_header(skb);
893 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
894
895 /* Check whether the ARP frame carries a valid
896 * IP information
897 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100898 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
899 return 0;
900 if (arphdr->ar_pro != htons(ETH_P_IP))
901 return 0;
902 if (arphdr->ar_hln != ETH_ALEN)
903 return 0;
904 if (arphdr->ar_pln != 4)
905 return 0;
906
907 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
908 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200909 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100910
911 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200912 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
913 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100914 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200915 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200916 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
917 ethhdr->h_source, vid, hw_src, 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",
952 ethhdr->h_source, 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{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200961 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100962 struct hlist_node *node, *node_tmp;
963 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);
977 hlist_for_each_entry_safe(backbone_gw, node, node_tmp,
978 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
996 hlist_del_rcu(node);
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{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001016 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +01001017 struct hlist_node *node;
1018 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001019 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001020 int i;
1021
Sven Eckelmann807736f2012-07-15 22:26:51 +02001022 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001023 if (!hash)
1024 return;
1025
1026 for (i = 0; i < hash->size; i++) {
1027 head = &hash->table[i];
1028
1029 rcu_read_lock();
1030 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
1031 if (now)
1032 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001033 if (!batadv_compare_eth(claim->backbone_gw->orig,
1034 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001035 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001036 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001037 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001038 continue;
1039
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001040 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001041 "bla_purge_claims(): %pM, vid %d, time out\n",
1042 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001043
1044purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001045 batadv_handle_unclaim(bat_priv, primary_if,
1046 claim->backbone_gw->orig,
1047 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001048 }
1049 rcu_read_unlock();
1050 }
1051}
1052
Ben Hutchings2c530402012-07-10 10:55:09 +00001053/**
1054 * batadv_bla_update_orig_address
1055 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001056 * @primary_if: the new selected primary_if
1057 * @oldif: the old primary interface, may be NULL
1058 *
1059 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001060 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001061void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1062 struct batadv_hard_iface *primary_if,
1063 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001064{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001065 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001066 struct hlist_node *node;
1067 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 Wunderlich23721382012-01-22 20:00:19 +01001076 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001077 batadv_bla_purge_claims(bat_priv, NULL, 1);
1078 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001079 return;
1080 }
1081
Sven Eckelmann807736f2012-07-15 22:26:51 +02001082 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001083 if (!hash)
1084 return;
1085
1086 for (i = 0; i < hash->size; i++) {
1087 head = &hash->table[i];
1088
1089 rcu_read_lock();
1090 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1091 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001092 if (!batadv_compare_eth(backbone_gw->orig,
1093 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001094 continue;
1095
1096 memcpy(backbone_gw->orig,
1097 primary_if->net_dev->dev_addr, ETH_ALEN);
1098 /* send an announce frame so others will ask for our
1099 * claims and update their tables.
1100 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001101 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001102 }
1103 rcu_read_unlock();
1104 }
1105}
1106
1107
1108
1109/* (re)start the timer */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001110static void batadv_bla_start_timer(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001111{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001112 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1113 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001114 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001115}
1116
1117/* periodic work to do:
1118 * * purge structures when they are too old
1119 * * send announcements
1120 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001121static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001122{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001123 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001124 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001125 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001126 struct hlist_node *node;
1127 struct hlist_head *head;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001128 struct batadv_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001129 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001130 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001131 int i;
1132
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001133 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001134 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1135 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001136 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001137 if (!primary_if)
1138 goto out;
1139
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001140 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1141 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001142
1143 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1144 goto out;
1145
Sven Eckelmann807736f2012-07-15 22:26:51 +02001146 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001147 if (!hash)
1148 goto out;
1149
1150 for (i = 0; i < hash->size; i++) {
1151 head = &hash->table[i];
1152
1153 rcu_read_lock();
1154 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001155 if (!batadv_compare_eth(backbone_gw->orig,
1156 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001157 continue;
1158
1159 backbone_gw->lasttime = jiffies;
1160
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001161 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlichd807f272012-09-09 22:27:57 +02001162
1163 /* request_sent is only set after creation to avoid
1164 * problems when we are not yet known as backbone gw
1165 * in the backbone.
1166 *
Simon Wunderlich28709872012-09-13 18:18:46 +02001167 * We can reset this now after we waited some periods
1168 * to give bridge forward delays and bla group forming
1169 * some grace time.
Simon Wunderlichd807f272012-09-09 22:27:57 +02001170 */
1171
1172 if (atomic_read(&backbone_gw->request_sent) == 0)
1173 continue;
1174
Simon Wunderlich28709872012-09-13 18:18:46 +02001175 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1176 continue;
1177
Simon Wunderlichd807f272012-09-09 22:27:57 +02001178 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1179 atomic_set(&backbone_gw->request_sent, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001180 }
1181 rcu_read_unlock();
1182 }
1183out:
1184 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001185 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001186
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001187 batadv_bla_start_timer(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001188}
1189
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001190/* The hash for claim and backbone hash receive the same key because they
1191 * are getting initialized by hash_new with the same key. Reinitializing
1192 * them with to different keys to allow nested locking without generating
1193 * lockdep warnings
1194 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001195static struct lock_class_key batadv_claim_hash_lock_class_key;
1196static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001197
Simon Wunderlich23721382012-01-22 20:00:19 +01001198/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001199int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001200{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001201 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001202 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001203 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001204 uint16_t crc;
1205 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001206
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001207 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1208
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001209 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001210
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001211 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001212 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1213 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001214 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001215 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001216 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1217 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001218 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001219 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001220 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001221 }
1222
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001223 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001224 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001225 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001226 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1227 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001228
Sven Eckelmann807736f2012-07-15 22:26:51 +02001229 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001230 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001231
Sven Eckelmann807736f2012-07-15 22:26:51 +02001232 bat_priv->bla.claim_hash = batadv_hash_new(128);
1233 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001234
Sven Eckelmann807736f2012-07-15 22:26:51 +02001235 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001236 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001237
Sven Eckelmann807736f2012-07-15 22:26:51 +02001238 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001239 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001240 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001241 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001242
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001243 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001244
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001245 batadv_bla_start_timer(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +02001246 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001247}
1248
Ben Hutchings2c530402012-07-10 10:55:09 +00001249/**
1250 * batadv_bla_check_bcast_duplist
1251 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001252 * @skb: contains the bcast_packet to be checked
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001253 *
1254 * check if it is on our broadcast list. Another gateway might
1255 * have sent the same packet because it is connected to the same backbone,
1256 * so we have to remove this duplicate.
1257 *
1258 * This is performed by checking the CRC, which will tell us
1259 * with a good chance that it is the same packet. If it is furthermore
1260 * sent by another host, drop it. We allow equal packets from
1261 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001262 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001263int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001264 struct sk_buff *skb)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001265{
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001266 int i, curr, ret = 0;
1267 __be32 crc;
1268 struct batadv_bcast_packet *bcast_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001269 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001270
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001271 bcast_packet = (struct batadv_bcast_packet *)skb->data;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001272
1273 /* calculate the crc ... */
Simon Wunderlich004e86f2012-10-18 13:47:42 +02001274 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001275
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001276 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1277
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001278 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001279 curr = (bat_priv->bla.bcast_duplist_curr + i);
1280 curr %= BATADV_DUPLIST_SIZE;
1281 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001282
1283 /* we can stop searching if the entry is too old ;
1284 * later entries will be even older
1285 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001286 if (batadv_has_timed_out(entry->entrytime,
1287 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001288 break;
1289
1290 if (entry->crc != crc)
1291 continue;
1292
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001293 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001294 continue;
1295
1296 /* this entry seems to match: same crc, not too old,
1297 * and from another gw. therefore return 1 to forbid it.
1298 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001299 ret = 1;
1300 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001301 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001302 /* not found, add a new entry (overwrite the oldest entry)
1303 * and allow it, its the first occurence.
1304 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001305 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001306 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001307 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001308 entry->crc = crc;
1309 entry->entrytime = jiffies;
1310 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001311 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001312
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001313out:
1314 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1315
1316 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001317}
1318
1319
1320
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001321/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001322 * @orig: originator mac address
1323 *
1324 * check if the originator is a gateway for any VLAN ID.
1325 *
1326 * returns 1 if it is found, 0 otherwise
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001327 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001328int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001329{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001330 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001331 struct hlist_head *head;
1332 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001333 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001334 int i;
1335
1336 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1337 return 0;
1338
1339 if (!hash)
1340 return 0;
1341
1342 for (i = 0; i < hash->size; i++) {
1343 head = &hash->table[i];
1344
1345 rcu_read_lock();
1346 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001347 if (batadv_compare_eth(backbone_gw->orig, orig)) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001348 rcu_read_unlock();
1349 return 1;
1350 }
1351 }
1352 rcu_read_unlock();
1353 }
1354
1355 return 0;
1356}
1357
1358
Ben Hutchings2c530402012-07-10 10:55:09 +00001359/**
1360 * batadv_bla_is_backbone_gw
1361 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001362 * @orig_node: the orig_node of the frame
1363 * @hdr_size: maximum length of the frame
1364 *
1365 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1366 * if the orig_node is also a gateway on the soft interface, otherwise it
1367 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001368 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001369int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001370 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001371{
1372 struct ethhdr *ethhdr;
1373 struct vlan_ethhdr *vhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001374 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001375 short vid = -1;
1376
1377 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1378 return 0;
1379
1380 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001381 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001382 return 0;
1383
1384 ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
1385
1386 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
1387 if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
1388 return 0;
1389
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001390 vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001391 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
1392 }
1393
1394 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001395 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1396 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001397 if (!backbone_gw)
1398 return 0;
1399
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001400 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001401 return 1;
1402}
1403
1404/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001405void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001406{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001407 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001408
Sven Eckelmann807736f2012-07-15 22:26:51 +02001409 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001410 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001411
Sven Eckelmann807736f2012-07-15 22:26:51 +02001412 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001413 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001414 batadv_hash_destroy(bat_priv->bla.claim_hash);
1415 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001416 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001417 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001418 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001419 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1420 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001421 }
1422 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001423 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001424}
1425
Ben Hutchings2c530402012-07-10 10:55:09 +00001426/**
1427 * batadv_bla_rx
1428 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001429 * @skb: the frame to be checked
1430 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001431 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001432 *
1433 * bla_rx avoidance checks if:
1434 * * we have to race for a claim
1435 * * if the frame is allowed on the LAN
1436 *
1437 * in these cases, the skb is further handled by this function and
1438 * returns 1, otherwise it returns 0 and the caller shall further
1439 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001440 */
David S. Miller04c9f412012-07-10 23:56:33 -07001441int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid,
1442 bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001443{
1444 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001445 struct batadv_claim search_claim, *claim = NULL;
1446 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001447 int ret;
1448
1449 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1450
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001451 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001452 if (!primary_if)
1453 goto handled;
1454
1455 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1456 goto allow;
1457
1458
Sven Eckelmann807736f2012-07-15 22:26:51 +02001459 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001460 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001461 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001462 goto handled;
1463
1464 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1465 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001466 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001467
1468 if (!claim) {
1469 /* possible optimization: race for a claim */
1470 /* No claim exists yet, claim it for us!
1471 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001472 batadv_handle_claim(bat_priv, primary_if,
1473 primary_if->net_dev->dev_addr,
1474 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001475 goto allow;
1476 }
1477
1478 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001479 if (batadv_compare_eth(claim->backbone_gw->orig,
1480 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001481 /* ... allow it in any case */
1482 claim->lasttime = jiffies;
1483 goto allow;
1484 }
1485
1486 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001487 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1488 /* ... drop it. the responsible gateway is in charge.
1489 *
1490 * We need to check is_bcast because with the gateway
1491 * feature, broadcasts (like DHCP requests) may be sent
1492 * using a unicast packet type.
1493 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001494 goto handled;
1495 } else {
1496 /* seems the client considers us as its best gateway.
1497 * send a claim and update the claim table
1498 * immediately.
1499 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001500 batadv_handle_claim(bat_priv, primary_if,
1501 primary_if->net_dev->dev_addr,
1502 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001503 goto allow;
1504 }
1505allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001506 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001507 ret = 0;
1508 goto out;
1509
1510handled:
1511 kfree_skb(skb);
1512 ret = 1;
1513
1514out:
1515 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001516 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001517 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001518 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001519 return ret;
1520}
1521
Ben Hutchings2c530402012-07-10 10:55:09 +00001522/**
1523 * batadv_bla_tx
1524 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001525 * @skb: the frame to be checked
1526 * @vid: the VLAN ID of the frame
1527 *
1528 * bla_tx checks if:
1529 * * a claim was received which has to be processed
1530 * * the frame is allowed on the mesh
1531 *
1532 * in these cases, the skb is further handled by this function and
1533 * returns 1, otherwise it returns 0 and the caller shall further
1534 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001535 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001536int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001537{
1538 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001539 struct batadv_claim search_claim, *claim = NULL;
1540 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
1556 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1557
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;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001615 struct batadv_claim *claim;
1616 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001617 struct hlist_node *node;
1618 struct hlist_head *head;
1619 uint32_t i;
1620 bool is_own;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001621 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001622
Marek Lindner30da63a2012-08-03 17:15:46 +02001623 primary_if = batadv_seq_print_text_primary_if_get(seq);
1624 if (!primary_if)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001625 goto out;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001626
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001627 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001628 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001629 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001630 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001631 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001632 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001633 "Client", "VID", "Originator", "CRC");
1634 for (i = 0; i < hash->size; i++) {
1635 head = &hash->table[i];
1636
1637 rcu_read_lock();
1638 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001639 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1640 primary_addr);
Antonio Quartulli39a32992012-11-19 09:01:43 +01001641 seq_printf(seq, " * %pM on % 5d by %pM [%c] (%#.4x)\n",
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001642 claim->addr, claim->vid,
1643 claim->backbone_gw->orig,
1644 (is_own ? 'x' : ' '),
1645 claim->backbone_gw->crc);
1646 }
1647 rcu_read_unlock();
1648 }
1649out:
1650 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001651 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001652 return 0;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001653}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001654
1655int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1656{
1657 struct net_device *net_dev = (struct net_device *)seq->private;
1658 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001659 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001660 struct batadv_backbone_gw *backbone_gw;
1661 struct batadv_hard_iface *primary_if;
1662 struct hlist_node *node;
1663 struct hlist_head *head;
1664 int secs, msecs;
1665 uint32_t i;
1666 bool is_own;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001667 uint8_t *primary_addr;
1668
Marek Lindner30da63a2012-08-03 17:15:46 +02001669 primary_if = batadv_seq_print_text_primary_if_get(seq);
1670 if (!primary_if)
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001671 goto out;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001672
1673 primary_addr = primary_if->net_dev->dev_addr;
1674 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001675 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001676 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001677 ntohs(bat_priv->bla.claim_dest.group));
Antonio Quartulli39a32992012-11-19 09:01:43 +01001678 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001679 "Originator", "VID", "last seen", "CRC");
1680 for (i = 0; i < hash->size; i++) {
1681 head = &hash->table[i];
1682
1683 rcu_read_lock();
1684 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1685 msecs = jiffies_to_msecs(jiffies -
1686 backbone_gw->lasttime);
1687 secs = msecs / 1000;
1688 msecs = msecs % 1000;
1689
1690 is_own = batadv_compare_eth(backbone_gw->orig,
1691 primary_addr);
1692 if (is_own)
1693 continue;
1694
1695 seq_printf(seq,
Antonio Quartulli39a32992012-11-19 09:01:43 +01001696 " * %pM on % 5d % 4i.%03is (%#.4x)\n",
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001697 backbone_gw->orig, backbone_gw->vid,
1698 secs, msecs, backbone_gw->crc);
1699 }
1700 rcu_read_unlock();
1701 }
1702out:
1703 if (primary_if)
1704 batadv_hardif_free_ref(primary_if);
Marek Lindner30da63a2012-08-03 17:15:46 +02001705 return 0;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001706}