blob: fd8d5afec0ddb372d514367df3a6a81996eeac49 [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{
43 const unsigned char *key = data;
44 uint32_t hash = 0;
45 size_t i;
46
47 for (i = 0; i < ETH_ALEN + sizeof(short); i++) {
48 hash += key[i];
49 hash += (hash << 10);
50 hash ^= (hash >> 6);
51 }
52
53 hash += (hash << 3);
54 hash ^= (hash >> 11);
55 hash += (hash << 15);
56
57 return hash % size;
58}
59
60/* return the index of the backbone gateway */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020061static inline uint32_t batadv_choose_backbone_gw(const void *data,
62 uint32_t size)
Simon Wunderlich23721382012-01-22 20:00:19 +010063{
64 const unsigned char *key = data;
65 uint32_t hash = 0;
66 size_t i;
67
68 for (i = 0; i < ETH_ALEN + sizeof(short); i++) {
69 hash += key[i];
70 hash += (hash << 10);
71 hash ^= (hash >> 6);
72 }
73
74 hash += (hash << 3);
75 hash ^= (hash >> 11);
76 hash += (hash << 15);
77
78 return hash % size;
79}
80
81
82/* compares address and vid of two backbone gws */
Sven Eckelmann3b300de2012-05-12 18:33:53 +020083static int batadv_compare_backbone_gw(const struct hlist_node *node,
84 const void *data2)
Simon Wunderlich23721382012-01-22 20:00:19 +010085{
Sven Eckelmann56303d32012-06-05 22:31:31 +020086 const void *data1 = container_of(node, struct batadv_backbone_gw,
Simon Wunderlich23721382012-01-22 20:00:19 +010087 hash_entry);
88
89 return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0);
90}
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{
Sven Eckelmann56303d32012-06-05 22:31:31 +020096 const void *data1 = container_of(node, struct batadv_claim,
Simon Wunderlich23721382012-01-22 20:00:19 +010097 hash_entry);
98
99 return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0);
100}
101
102/* free a backbone gw */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200103static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100104{
105 if (atomic_dec_and_test(&backbone_gw->refcount))
106 kfree_rcu(backbone_gw, rcu);
107}
108
109/* finally deinitialize the claim */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200110static void batadv_claim_free_rcu(struct rcu_head *rcu)
Simon Wunderlich23721382012-01-22 20:00:19 +0100111{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200112 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100113
Sven Eckelmann56303d32012-06-05 22:31:31 +0200114 claim = container_of(rcu, struct batadv_claim, rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100115
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200116 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100117 kfree(claim);
118}
119
120/* free a claim, call claim_free_rcu if its the last reference */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200121static void batadv_claim_free_ref(struct batadv_claim *claim)
Simon Wunderlich23721382012-01-22 20:00:19 +0100122{
123 if (atomic_dec_and_test(&claim->refcount))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200124 call_rcu(&claim->rcu, batadv_claim_free_rcu);
Simon Wunderlich23721382012-01-22 20:00:19 +0100125}
126
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200127/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100128 * @data: search data (may be local/static data)
129 *
130 * looks for a claim in the hash, and returns it if found
131 * or NULL otherwise.
132 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200133static struct batadv_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv,
134 struct batadv_claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100135{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200136 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100137 struct hlist_head *head;
138 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200139 struct batadv_claim *claim;
140 struct batadv_claim *claim_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100141 int index;
142
143 if (!hash)
144 return NULL;
145
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200146 index = batadv_choose_claim(data, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100147 head = &hash->table[index];
148
149 rcu_read_lock();
150 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200151 if (!batadv_compare_claim(&claim->hash_entry, data))
Simon Wunderlich23721382012-01-22 20:00:19 +0100152 continue;
153
154 if (!atomic_inc_not_zero(&claim->refcount))
155 continue;
156
157 claim_tmp = claim;
158 break;
159 }
160 rcu_read_unlock();
161
162 return claim_tmp;
163}
164
Ben Hutchings2c530402012-07-10 10:55:09 +0000165/**
166 * batadv_backbone_hash_find - looks for a claim in the hash
167 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100168 * @addr: the address of the originator
169 * @vid: the VLAN ID
170 *
Ben Hutchings2c530402012-07-10 10:55:09 +0000171 * Returns claim if found or NULL otherwise.
Simon Wunderlich23721382012-01-22 20:00:19 +0100172 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200173static struct batadv_backbone_gw *
174batadv_backbone_hash_find(struct batadv_priv *bat_priv,
175 uint8_t *addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100176{
Sven Eckelmann807736f2012-07-15 22:26:51 +0200177 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100178 struct hlist_head *head;
179 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200180 struct batadv_backbone_gw search_entry, *backbone_gw;
181 struct batadv_backbone_gw *backbone_gw_tmp = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +0100182 int index;
183
184 if (!hash)
185 return NULL;
186
187 memcpy(search_entry.orig, addr, ETH_ALEN);
188 search_entry.vid = vid;
189
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200190 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100191 head = &hash->table[index];
192
193 rcu_read_lock();
194 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200195 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
196 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100197 continue;
198
199 if (!atomic_inc_not_zero(&backbone_gw->refcount))
200 continue;
201
202 backbone_gw_tmp = backbone_gw;
203 break;
204 }
205 rcu_read_unlock();
206
207 return backbone_gw_tmp;
208}
209
210/* delete all claims for a backbone */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200211static void
212batadv_bla_del_backbone_claims(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100213{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200214 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100215 struct hlist_node *node, *node_tmp;
216 struct hlist_head *head;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200217 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100218 int i;
219 spinlock_t *list_lock; /* protects write access to the hash lists */
220
Sven Eckelmann807736f2012-07-15 22:26:51 +0200221 hash = backbone_gw->bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100222 if (!hash)
223 return;
224
225 for (i = 0; i < hash->size; i++) {
226 head = &hash->table[i];
227 list_lock = &hash->list_locks[i];
228
229 spin_lock_bh(list_lock);
230 hlist_for_each_entry_safe(claim, node, node_tmp,
231 head, hash_entry) {
232
233 if (claim->backbone_gw != backbone_gw)
234 continue;
235
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200236 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100237 hlist_del_rcu(node);
238 }
239 spin_unlock_bh(list_lock);
240 }
241
242 /* all claims gone, intialize CRC */
Sven Eckelmann3964f722012-06-03 22:19:10 +0200243 backbone_gw->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100244}
245
Ben Hutchings2c530402012-07-10 10:55:09 +0000246/**
247 * batadv_bla_send_claim - sends a claim frame according to the provided info
248 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100249 * @orig: the mac address to be announced within the claim
250 * @vid: the VLAN ID
251 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
Simon Wunderlich23721382012-01-22 20:00:19 +0100252 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200253static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200254 short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100255{
256 struct sk_buff *skb;
257 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200258 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +0100259 struct net_device *soft_iface;
260 uint8_t *hw_src;
Sven Eckelmann96412692012-06-05 22:31:30 +0200261 struct batadv_bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100262 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100263
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200264 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100265 if (!primary_if)
266 return;
267
Sven Eckelmann807736f2012-07-15 22:26:51 +0200268 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100269 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100270 local_claim_dest.type = claimtype;
271
272 soft_iface = primary_if->soft_iface;
273
274 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
275 /* IP DST: 0.0.0.0 */
276 zeroip,
277 primary_if->soft_iface,
278 /* IP SRC: 0.0.0.0 */
279 zeroip,
280 /* Ethernet DST: Broadcast */
281 NULL,
282 /* Ethernet SRC/HW SRC: originator mac */
283 primary_if->net_dev->dev_addr,
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200284 /* HW DST: FF:43:05:XX:YY:YY
Simon Wunderlich23721382012-01-22 20:00:19 +0100285 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100286 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100287 */
288 (uint8_t *)&local_claim_dest);
289
290 if (!skb)
291 goto out;
292
293 ethhdr = (struct ethhdr *)skb->data;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100294 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100295
296 /* now we pretend that the client would have sent this ... */
297 switch (claimtype) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200298 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100299 /* normal claim frame
300 * set Ethernet SRC to the clients mac
301 */
302 memcpy(ethhdr->h_source, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200303 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200304 "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100305 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200306 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich23721382012-01-22 20:00:19 +0100307 /* unclaim frame
308 * set HW SRC to the clients mac
309 */
310 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200311 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200312 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
313 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100314 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200315 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich23721382012-01-22 20:00:19 +0100316 /* announcement frame
317 * set HW SRC to the special mac containg the crc
318 */
319 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200320 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200321 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
322 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100323 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200324 case BATADV_CLAIM_TYPE_REQUEST:
Simon Wunderlich23721382012-01-22 20:00:19 +0100325 /* request frame
Simon Wunderlich99e966f2012-06-23 12:34:17 +0200326 * set HW SRC and header destination to the receiving backbone
327 * gws mac
Simon Wunderlich23721382012-01-22 20:00:19 +0100328 */
329 memcpy(hw_src, mac, ETH_ALEN);
330 memcpy(ethhdr->h_dest, mac, ETH_ALEN);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200331 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200332 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
333 ethhdr->h_source, ethhdr->h_dest, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100334 break;
335
336 }
337
338 if (vid != -1)
339 skb = vlan_insert_tag(skb, vid);
340
341 skb_reset_mac_header(skb);
342 skb->protocol = eth_type_trans(skb, soft_iface);
Marek Lindner1c9b0552012-06-23 11:47:53 +0200343 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
344 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
345 skb->len + ETH_HLEN);
Simon Wunderlich23721382012-01-22 20:00:19 +0100346 soft_iface->last_rx = jiffies;
347
348 netif_rx(skb);
349out:
350 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200351 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100352}
353
Ben Hutchings2c530402012-07-10 10:55:09 +0000354/**
355 * batadv_bla_get_backbone_gw
356 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100357 * @orig: the mac address of the originator
358 * @vid: the VLAN ID
359 *
360 * searches for the backbone gw or creates a new one if it could not
361 * be found.
362 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200363static struct batadv_backbone_gw *
364batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
365 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100366{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200367 struct batadv_backbone_gw *entry;
368 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100369 int hash_added;
370
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200371 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100372
373 if (entry)
374 return entry;
375
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200376 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200377 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
378 orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100379
380 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
381 if (!entry)
382 return NULL;
383
384 entry->vid = vid;
385 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200386 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100387 entry->bat_priv = bat_priv;
388 atomic_set(&entry->request_sent, 0);
389 memcpy(entry->orig, orig, ETH_ALEN);
390
391 /* one for the hash, one for returning */
392 atomic_set(&entry->refcount, 2);
393
Sven Eckelmann807736f2012-07-15 22:26:51 +0200394 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200395 batadv_compare_backbone_gw,
396 batadv_choose_backbone_gw, entry,
397 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100398
399 if (unlikely(hash_added != 0)) {
400 /* hash failed, free the structure */
401 kfree(entry);
402 return NULL;
403 }
404
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100405 /* this is a gateway now, remove any tt entries */
Sven Eckelmannda641192012-05-12 13:48:56 +0200406 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100407 if (orig_node) {
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200408 batadv_tt_global_del_orig(bat_priv, orig_node,
409 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200410 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100411 }
Simon Wunderlich23721382012-01-22 20:00:19 +0100412 return entry;
413}
414
415/* update or add the own backbone gw to make sure we announce
416 * where we receive other backbone gws
417 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200418static void
419batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
420 struct batadv_hard_iface *primary_if,
421 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100422{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200423 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100424
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200425 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
426 primary_if->net_dev->dev_addr,
427 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100428 if (unlikely(!backbone_gw))
429 return;
430
431 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200432 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100433}
434
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200435/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100436 * @vid: the vid where the request came on
437 *
438 * Repeat all of our own claims, and finally send an ANNOUNCE frame
439 * to allow the requester another check if the CRC is correct now.
440 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200441static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
442 struct batadv_hard_iface *primary_if,
443 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100444{
445 struct hlist_node *node;
446 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200447 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200448 struct batadv_claim *claim;
449 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100450 int i;
451
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200452 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200453 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100454
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200455 backbone_gw = batadv_backbone_hash_find(bat_priv,
456 primary_if->net_dev->dev_addr,
457 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100458 if (!backbone_gw)
459 return;
460
Sven Eckelmann807736f2012-07-15 22:26:51 +0200461 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100462 for (i = 0; i < hash->size; i++) {
463 head = &hash->table[i];
464
465 rcu_read_lock();
466 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
467 /* only own claims are interesting */
468 if (claim->backbone_gw != backbone_gw)
469 continue;
470
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200471 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200472 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100473 }
474 rcu_read_unlock();
475 }
476
477 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200478 batadv_bla_send_announce(bat_priv, backbone_gw);
479 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100480}
481
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200482/* @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100483 *
484 * When the crc is wrong, ask the backbone gateway for a full table update.
485 * After the request, it will repeat all of his own claims and finally
486 * send an announcement claim with which we can check again.
487 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200488static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100489{
490 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200491 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100492
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200493 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
494 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100495
496 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200497 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200498 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100499
500 /* no local broadcasts should be sent or received, for now. */
501 if (!atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200502 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100503 atomic_set(&backbone_gw->request_sent, 1);
504 }
505}
506
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200507/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100508 * @backbone_gw: our backbone gateway which should be announced
509 *
510 * This function sends an announcement. It is called from multiple
511 * places.
512 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200513static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
514 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100515{
516 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100517 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100518
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200519 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100520 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100521 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100522
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200523 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200524 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100525
526}
527
Ben Hutchings2c530402012-07-10 10:55:09 +0000528/**
529 * batadv_bla_add_claim - Adds a claim in the claim hash
530 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100531 * @mac: the mac address of the claim
532 * @vid: the VLAN ID of the frame
533 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100534 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200535static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
536 const uint8_t *mac, const short vid,
537 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100538{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200539 struct batadv_claim *claim;
540 struct batadv_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100541 int hash_added;
542
543 memcpy(search_claim.addr, mac, ETH_ALEN);
544 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200545 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100546
547 /* create a new claim entry if it does not exist yet. */
548 if (!claim) {
549 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
550 if (!claim)
551 return;
552
553 memcpy(claim->addr, mac, ETH_ALEN);
554 claim->vid = vid;
555 claim->lasttime = jiffies;
556 claim->backbone_gw = backbone_gw;
557
558 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200559 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200560 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
561 mac, vid);
Sven Eckelmann807736f2012-07-15 22:26:51 +0200562 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200563 batadv_compare_claim,
564 batadv_choose_claim, claim,
565 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100566
567 if (unlikely(hash_added != 0)) {
568 /* only local changes happened. */
569 kfree(claim);
570 return;
571 }
572 } else {
573 claim->lasttime = jiffies;
574 if (claim->backbone_gw == backbone_gw)
575 /* no need to register a new backbone */
576 goto claim_free_ref;
577
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200578 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200579 "bla_add_claim(): changing ownership for %pM, vid %d\n",
580 mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100581
Sven Eckelmannbbb1f902012-07-08 17:13:15 +0200582 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200583 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100584
585 }
586 /* set (new) backbone gw */
587 atomic_inc(&backbone_gw->refcount);
588 claim->backbone_gw = backbone_gw;
589
590 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
591 backbone_gw->lasttime = jiffies;
592
593claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200594 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100595}
596
597/* Delete a claim from the claim hash which has the
598 * given mac address and vid.
599 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200600static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
601 const uint8_t *mac, const short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100602{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200603 struct batadv_claim search_claim, *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100604
605 memcpy(search_claim.addr, mac, ETH_ALEN);
606 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200607 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100608 if (!claim)
609 return;
610
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200611 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
612 mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100613
Sven Eckelmann807736f2012-07-15 22:26:51 +0200614 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200615 batadv_choose_claim, claim);
616 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100617
618 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
619
620 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200621 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100622}
623
624/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200625static int batadv_handle_announce(struct batadv_priv *bat_priv,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200626 uint8_t *an_addr, uint8_t *backbone_addr,
627 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100628{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200629 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100630 uint16_t crc;
631
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200632 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100633 return 0;
634
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200635 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100636
637 if (unlikely(!backbone_gw))
638 return 1;
639
640
641 /* handle as ANNOUNCE frame */
642 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100643 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100644
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200645 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200646 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n",
647 vid, backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100648
649 if (backbone_gw->crc != crc) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200650 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200651 "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n",
652 backbone_gw->orig, backbone_gw->vid,
653 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100654
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200655 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100656 } else {
657 /* if we have sent a request and the crc was OK,
658 * we can allow traffic again.
659 */
660 if (atomic_read(&backbone_gw->request_sent)) {
Sven Eckelmann807736f2012-07-15 22:26:51 +0200661 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100662 atomic_set(&backbone_gw->request_sent, 0);
663 }
664 }
665
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200666 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100667 return 1;
668}
669
670/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200671static int batadv_handle_request(struct batadv_priv *bat_priv,
672 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200673 uint8_t *backbone_addr,
674 struct ethhdr *ethhdr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100675{
676 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200677 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100678 return 0;
679
680 /* sanity check, this should not happen on a normal switch,
681 * we ignore it in this case.
682 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200683 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100684 return 1;
685
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200686 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200687 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
688 vid, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100689
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200690 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100691 return 1;
692}
693
694/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200695static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
696 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200697 uint8_t *backbone_addr,
698 uint8_t *claim_addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100699{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200700 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100701
702 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200703 if (primary_if && batadv_compare_eth(backbone_addr,
704 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200705 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200706 BATADV_CLAIM_TYPE_UNCLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100707
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200708 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100709
710 if (!backbone_gw)
711 return 1;
712
713 /* this must be an UNCLAIM frame */
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200714 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200715 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
716 claim_addr, vid, backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100717
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200718 batadv_bla_del_claim(bat_priv, claim_addr, vid);
719 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100720 return 1;
721}
722
723/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200724static int batadv_handle_claim(struct batadv_priv *bat_priv,
725 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200726 uint8_t *backbone_addr, uint8_t *claim_addr,
727 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100728{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200729 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100730
731 /* register the gateway if not yet available, and add the claim. */
732
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200733 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100734
735 if (unlikely(!backbone_gw))
736 return 1;
737
738 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200739 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200740 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200741 batadv_bla_send_claim(bat_priv, claim_addr, vid,
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200742 BATADV_CLAIM_TYPE_CLAIM);
Simon Wunderlich23721382012-01-22 20:00:19 +0100743
744 /* TODO: we could call something like tt_local_del() here. */
745
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200746 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100747 return 1;
748}
749
Ben Hutchings2c530402012-07-10 10:55:09 +0000750/**
751 * batadv_check_claim_group
752 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100753 * @hw_src: the Hardware source in the ARP Header
754 * @hw_dst: the Hardware destination in the ARP Header
755 * @ethhdr: pointer to the Ethernet header of the claim frame
756 *
757 * checks if it is a claim packet and if its on the same group.
758 * This function also applies the group ID of the sender
759 * if it is in the same mesh.
760 *
761 * returns:
762 * 2 - if it is a claim packet and on the same group
763 * 1 - if is a claim packet from another group
764 * 0 - if it is not a claim packet
765 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200766static int batadv_check_claim_group(struct batadv_priv *bat_priv,
767 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200768 uint8_t *hw_src, uint8_t *hw_dst,
769 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100770{
771 uint8_t *backbone_addr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200772 struct batadv_orig_node *orig_node;
Sven Eckelmann96412692012-06-05 22:31:30 +0200773 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100774
Sven Eckelmann96412692012-06-05 22:31:30 +0200775 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200776 bla_dst_own = &bat_priv->bla.claim_dest;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100777
778 /* check if it is a claim packet in general */
779 if (memcmp(bla_dst->magic, bla_dst_own->magic,
780 sizeof(bla_dst->magic)) != 0)
781 return 0;
782
783 /* if announcement packet, use the source,
784 * otherwise assume it is in the hw_src
785 */
786 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200787 case BATADV_CLAIM_TYPE_CLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100788 backbone_addr = hw_src;
789 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200790 case BATADV_CLAIM_TYPE_REQUEST:
791 case BATADV_CLAIM_TYPE_ANNOUNCE:
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200792 case BATADV_CLAIM_TYPE_UNCLAIM:
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100793 backbone_addr = ethhdr->h_source;
794 break;
795 default:
796 return 0;
797 }
798
799 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200800 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100801 return 0;
802
803 /* if its already the same group, it is fine. */
804 if (bla_dst->group == bla_dst_own->group)
805 return 2;
806
807 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200808 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100809
810 /* dont accept claims from gateways which are not in
811 * the same mesh or group.
812 */
813 if (!orig_node)
814 return 1;
815
816 /* if our mesh friends mac is bigger, use it for ourselves. */
817 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200818 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200819 "taking other backbones claim group: %04x\n",
820 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100821 bla_dst_own->group = bla_dst->group;
822 }
823
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200824 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100825
826 return 2;
827}
828
829
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200830/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100831 * @skb: the frame to be checked
832 *
833 * Check if this is a claim frame, and process it accordingly.
834 *
835 * returns 1 if it was a claim frame, otherwise return 0 to
836 * tell the callee that it can use the frame on its own.
837 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200838static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
839 struct batadv_hard_iface *primary_if,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200840 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100841{
842 struct ethhdr *ethhdr;
843 struct vlan_ethhdr *vhdr;
844 struct arphdr *arphdr;
845 uint8_t *hw_src, *hw_dst;
Sven Eckelmann96412692012-06-05 22:31:30 +0200846 struct batadv_bla_claim_dst *bla_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100847 uint16_t proto;
848 int headlen;
849 short vid = -1;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100850 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100851
852 ethhdr = (struct ethhdr *)skb_mac_header(skb);
853
854 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
855 vhdr = (struct vlan_ethhdr *)ethhdr;
856 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
857 proto = ntohs(vhdr->h_vlan_encapsulated_proto);
858 headlen = sizeof(*vhdr);
859 } else {
860 proto = ntohs(ethhdr->h_proto);
Antonio Quartulli0d125072012-02-18 11:27:34 +0100861 headlen = ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100862 }
863
864 if (proto != ETH_P_ARP)
865 return 0; /* not a claim frame */
866
867 /* this must be a ARP frame. check if it is a claim. */
868
869 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
870 return 0;
871
872 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
873 ethhdr = (struct ethhdr *)skb_mac_header(skb);
874 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
875
876 /* Check whether the ARP frame carries a valid
877 * IP information
878 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100879 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
880 return 0;
881 if (arphdr->ar_pro != htons(ETH_P_IP))
882 return 0;
883 if (arphdr->ar_hln != ETH_ALEN)
884 return 0;
885 if (arphdr->ar_pln != 4)
886 return 0;
887
888 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
889 hw_dst = hw_src + ETH_ALEN + 4;
Sven Eckelmann96412692012-06-05 22:31:30 +0200890 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
Simon Wunderlich23721382012-01-22 20:00:19 +0100891
892 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200893 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
894 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100895 if (ret == 1)
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200896 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200897 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
898 ethhdr->h_source, vid, hw_src, hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100899
900 if (ret < 2)
901 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100902
903 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200904 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100905
906 /* check for the different types of claim frames ... */
907 switch (bla_dst->type) {
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200908 case BATADV_CLAIM_TYPE_CLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200909 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
910 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100911 return 1;
912 break;
Simon Wunderlich3eb87732012-06-23 12:34:18 +0200913 case BATADV_CLAIM_TYPE_UNCLAIM:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200914 if (batadv_handle_unclaim(bat_priv, primary_if,
915 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100916 return 1;
917 break;
918
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200919 case BATADV_CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200920 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
921 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100922 return 1;
923 break;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200924 case BATADV_CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200925 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
926 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100927 return 1;
928 break;
929 }
930
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200931 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200932 "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",
933 ethhdr->h_source, vid, hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100934 return 1;
935}
936
937/* Check when we last heard from other nodes, and remove them in case of
938 * a time out, or clean all backbone gws if now is set.
939 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200940static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100941{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200942 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100943 struct hlist_node *node, *node_tmp;
944 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200945 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100946 spinlock_t *list_lock; /* protects write access to the hash lists */
947 int i;
948
Sven Eckelmann807736f2012-07-15 22:26:51 +0200949 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +0100950 if (!hash)
951 return;
952
953 for (i = 0; i < hash->size; i++) {
954 head = &hash->table[i];
955 list_lock = &hash->list_locks[i];
956
957 spin_lock_bh(list_lock);
958 hlist_for_each_entry_safe(backbone_gw, node, node_tmp,
959 head, hash_entry) {
960 if (now)
961 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200962 if (!batadv_has_timed_out(backbone_gw->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200963 BATADV_BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +0100964 continue;
965
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200966 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200967 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
968 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100969
970purge_now:
971 /* don't wait for the pending request anymore */
972 if (atomic_read(&backbone_gw->request_sent))
Sven Eckelmann807736f2012-07-15 22:26:51 +0200973 atomic_dec(&bat_priv->bla.num_requests);
Simon Wunderlich23721382012-01-22 20:00:19 +0100974
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200975 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100976
977 hlist_del_rcu(node);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200978 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100979 }
980 spin_unlock_bh(list_lock);
981 }
982}
983
Ben Hutchings2c530402012-07-10 10:55:09 +0000984/**
985 * batadv_bla_purge_claims
986 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100987 * @primary_if: the selected primary interface, may be NULL if now is set
988 * @now: whether the whole hash shall be wiped now
989 *
990 * Check when we heard last time from our own claims, and remove them in case of
991 * a time out, or clean all claims if now is set
992 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200993static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
994 struct batadv_hard_iface *primary_if,
995 int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100996{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200997 struct batadv_claim *claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100998 struct hlist_node *node;
999 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001000 struct batadv_hashtable *hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001001 int i;
1002
Sven Eckelmann807736f2012-07-15 22:26:51 +02001003 hash = bat_priv->bla.claim_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001004 if (!hash)
1005 return;
1006
1007 for (i = 0; i < hash->size; i++) {
1008 head = &hash->table[i];
1009
1010 rcu_read_lock();
1011 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
1012 if (now)
1013 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001014 if (!batadv_compare_eth(claim->backbone_gw->orig,
1015 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001016 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001017 if (!batadv_has_timed_out(claim->lasttime,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001018 BATADV_BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001019 continue;
1020
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001021 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001022 "bla_purge_claims(): %pM, vid %d, time out\n",
1023 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001024
1025purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001026 batadv_handle_unclaim(bat_priv, primary_if,
1027 claim->backbone_gw->orig,
1028 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001029 }
1030 rcu_read_unlock();
1031 }
1032}
1033
Ben Hutchings2c530402012-07-10 10:55:09 +00001034/**
1035 * batadv_bla_update_orig_address
1036 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001037 * @primary_if: the new selected primary_if
1038 * @oldif: the old primary interface, may be NULL
1039 *
1040 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001041 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001042void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1043 struct batadv_hard_iface *primary_if,
1044 struct batadv_hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001045{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001046 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001047 struct hlist_node *node;
1048 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001049 struct batadv_hashtable *hash;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001050 __be16 group;
Simon Wunderlich23721382012-01-22 20:00:19 +01001051 int i;
1052
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001053 /* reset bridge loop avoidance group id */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001054 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1055 bat_priv->bla.claim_dest.group = group;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001056
Simon Wunderlich23721382012-01-22 20:00:19 +01001057 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001058 batadv_bla_purge_claims(bat_priv, NULL, 1);
1059 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001060 return;
1061 }
1062
Sven Eckelmann807736f2012-07-15 22:26:51 +02001063 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001064 if (!hash)
1065 return;
1066
1067 for (i = 0; i < hash->size; i++) {
1068 head = &hash->table[i];
1069
1070 rcu_read_lock();
1071 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1072 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001073 if (!batadv_compare_eth(backbone_gw->orig,
1074 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001075 continue;
1076
1077 memcpy(backbone_gw->orig,
1078 primary_if->net_dev->dev_addr, ETH_ALEN);
1079 /* send an announce frame so others will ask for our
1080 * claims and update their tables.
1081 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001082 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001083 }
1084 rcu_read_unlock();
1085 }
1086}
1087
1088
1089
1090/* (re)start the timer */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001091static void batadv_bla_start_timer(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001092{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001093 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1094 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001095 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001096}
1097
1098/* periodic work to do:
1099 * * purge structures when they are too old
1100 * * send announcements
1101 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001102static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001103{
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001104 struct delayed_work *delayed_work;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001105 struct batadv_priv *bat_priv;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001106 struct batadv_priv_bla *priv_bla;
Simon Wunderlich23721382012-01-22 20:00:19 +01001107 struct hlist_node *node;
1108 struct hlist_head *head;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001109 struct batadv_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001110 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001111 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001112 int i;
1113
Sven Eckelmannbbb1f902012-07-08 17:13:15 +02001114 delayed_work = container_of(work, struct delayed_work, work);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001115 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1116 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001117 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001118 if (!primary_if)
1119 goto out;
1120
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001121 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1122 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001123
1124 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1125 goto out;
1126
Sven Eckelmann807736f2012-07-15 22:26:51 +02001127 hash = bat_priv->bla.backbone_hash;
Simon Wunderlich23721382012-01-22 20:00:19 +01001128 if (!hash)
1129 goto out;
1130
1131 for (i = 0; i < hash->size; i++) {
1132 head = &hash->table[i];
1133
1134 rcu_read_lock();
1135 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001136 if (!batadv_compare_eth(backbone_gw->orig,
1137 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001138 continue;
1139
1140 backbone_gw->lasttime = jiffies;
1141
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001142 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001143 }
1144 rcu_read_unlock();
1145 }
1146out:
1147 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001148 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001149
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001150 batadv_bla_start_timer(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001151}
1152
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001153/* The hash for claim and backbone hash receive the same key because they
1154 * are getting initialized by hash_new with the same key. Reinitializing
1155 * them with to different keys to allow nested locking without generating
1156 * lockdep warnings
1157 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001158static struct lock_class_key batadv_claim_hash_lock_class_key;
1159static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001160
Simon Wunderlich23721382012-01-22 20:00:19 +01001161/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001162int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001163{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001164 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001165 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001166 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001167 uint16_t crc;
1168 unsigned long entrytime;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001169
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001170 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1171
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001172 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001173
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001174 /* setting claim destination address */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001175 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1176 bat_priv->bla.claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001177 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001178 if (primary_if) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001179 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1180 bat_priv->bla.claim_dest.group = htons(crc);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001181 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001182 } else {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001183 bat_priv->bla.claim_dest.group = 0; /* will be set later */
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001184 }
1185
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001186 /* initialize the duplicate list */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001187 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001188 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Sven Eckelmann807736f2012-07-15 22:26:51 +02001189 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1190 bat_priv->bla.bcast_duplist_curr = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001191
Sven Eckelmann807736f2012-07-15 22:26:51 +02001192 if (bat_priv->bla.claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001193 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001194
Sven Eckelmann807736f2012-07-15 22:26:51 +02001195 bat_priv->bla.claim_hash = batadv_hash_new(128);
1196 bat_priv->bla.backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001197
Sven Eckelmann807736f2012-07-15 22:26:51 +02001198 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001199 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001200
Sven Eckelmann807736f2012-07-15 22:26:51 +02001201 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001202 &batadv_claim_hash_lock_class_key);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001203 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001204 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001205
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001206 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001207
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001208 batadv_bla_start_timer(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +02001209 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001210}
1211
Ben Hutchings2c530402012-07-10 10:55:09 +00001212/**
1213 * batadv_bla_check_bcast_duplist
1214 * @bat_priv: the bat priv with all the soft interface information
Linus Lüssing7f112af2012-10-17 14:53:04 +02001215 * @bcast_packet: encapsulated broadcast frame plus batman header
1216 * @bcast_packet_len: length of encapsulated broadcast frame plus batman header
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001217 *
1218 * check if it is on our broadcast list. Another gateway might
1219 * have sent the same packet because it is connected to the same backbone,
1220 * so we have to remove this duplicate.
1221 *
1222 * This is performed by checking the CRC, which will tell us
1223 * with a good chance that it is the same packet. If it is furthermore
1224 * sent by another host, drop it. We allow equal packets from
1225 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001226 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001227int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Sven Eckelmann96412692012-06-05 22:31:30 +02001228 struct batadv_bcast_packet *bcast_packet,
Linus Lüssing7f112af2012-10-17 14:53:04 +02001229 int bcast_packet_len)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001230{
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001231 int i, length, curr, ret = 0;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001232 uint8_t *content;
1233 uint16_t crc;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001234 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001235
Linus Lüssing7f112af2012-10-17 14:53:04 +02001236 length = bcast_packet_len - sizeof(*bcast_packet);
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001237 content = (uint8_t *)bcast_packet;
1238 content += sizeof(*bcast_packet);
1239
1240 /* calculate the crc ... */
1241 crc = crc16(0, content, length);
1242
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001243 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1244
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001245 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
Sven Eckelmann807736f2012-07-15 22:26:51 +02001246 curr = (bat_priv->bla.bcast_duplist_curr + i);
1247 curr %= BATADV_DUPLIST_SIZE;
1248 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001249
1250 /* we can stop searching if the entry is too old ;
1251 * later entries will be even older
1252 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001253 if (batadv_has_timed_out(entry->entrytime,
1254 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001255 break;
1256
1257 if (entry->crc != crc)
1258 continue;
1259
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001260 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001261 continue;
1262
1263 /* this entry seems to match: same crc, not too old,
1264 * and from another gw. therefore return 1 to forbid it.
1265 */
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001266 ret = 1;
1267 goto out;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001268 }
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001269 /* not found, add a new entry (overwrite the oldest entry)
1270 * and allow it, its the first occurence.
1271 */
Sven Eckelmann807736f2012-07-15 22:26:51 +02001272 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001273 curr %= BATADV_DUPLIST_SIZE;
Sven Eckelmann807736f2012-07-15 22:26:51 +02001274 entry = &bat_priv->bla.bcast_duplist[curr];
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001275 entry->crc = crc;
1276 entry->entrytime = jiffies;
1277 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001278 bat_priv->bla.bcast_duplist_curr = curr;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001279
Linus Lüssing7dac7b72012-10-17 14:53:05 +02001280out:
1281 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1282
1283 return ret;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001284}
1285
1286
1287
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001288/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001289 * @orig: originator mac address
1290 *
1291 * check if the originator is a gateway for any VLAN ID.
1292 *
1293 * returns 1 if it is found, 0 otherwise
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001294 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001295int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001296{
Sven Eckelmann807736f2012-07-15 22:26:51 +02001297 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001298 struct hlist_head *head;
1299 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001300 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001301 int i;
1302
1303 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1304 return 0;
1305
1306 if (!hash)
1307 return 0;
1308
1309 for (i = 0; i < hash->size; i++) {
1310 head = &hash->table[i];
1311
1312 rcu_read_lock();
1313 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001314 if (batadv_compare_eth(backbone_gw->orig, orig)) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001315 rcu_read_unlock();
1316 return 1;
1317 }
1318 }
1319 rcu_read_unlock();
1320 }
1321
1322 return 0;
1323}
1324
1325
Ben Hutchings2c530402012-07-10 10:55:09 +00001326/**
1327 * batadv_bla_is_backbone_gw
1328 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001329 * @orig_node: the orig_node of the frame
1330 * @hdr_size: maximum length of the frame
1331 *
1332 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1333 * if the orig_node is also a gateway on the soft interface, otherwise it
1334 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001335 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001336int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001337 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001338{
1339 struct ethhdr *ethhdr;
1340 struct vlan_ethhdr *vhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001341 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001342 short vid = -1;
1343
1344 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1345 return 0;
1346
1347 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001348 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001349 return 0;
1350
1351 ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
1352
1353 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
1354 if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
1355 return 0;
1356
Sven Eckelmannc67893d2012-07-08 18:33:51 +02001357 vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
Simon Wunderlich23721382012-01-22 20:00:19 +01001358 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
1359 }
1360
1361 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001362 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1363 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001364 if (!backbone_gw)
1365 return 0;
1366
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001367 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001368 return 1;
1369}
1370
1371/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001372void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001373{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001374 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001375
Sven Eckelmann807736f2012-07-15 22:26:51 +02001376 cancel_delayed_work_sync(&bat_priv->bla.work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001377 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001378
Sven Eckelmann807736f2012-07-15 22:26:51 +02001379 if (bat_priv->bla.claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001380 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001381 batadv_hash_destroy(bat_priv->bla.claim_hash);
1382 bat_priv->bla.claim_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001383 }
Sven Eckelmann807736f2012-07-15 22:26:51 +02001384 if (bat_priv->bla.backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001385 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001386 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1387 bat_priv->bla.backbone_hash = NULL;
Simon Wunderlich23721382012-01-22 20:00:19 +01001388 }
1389 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001390 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001391}
1392
Ben Hutchings2c530402012-07-10 10:55:09 +00001393/**
1394 * batadv_bla_rx
1395 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001396 * @skb: the frame to be checked
1397 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001398 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001399 *
1400 * bla_rx avoidance checks if:
1401 * * we have to race for a claim
1402 * * if the frame is allowed on the LAN
1403 *
1404 * in these cases, the skb is further handled by this function and
1405 * returns 1, otherwise it returns 0 and the caller shall further
1406 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001407 */
David S. Miller04c9f412012-07-10 23:56:33 -07001408int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid,
1409 bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001410{
1411 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001412 struct batadv_claim search_claim, *claim = NULL;
1413 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001414 int ret;
1415
1416 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1417
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001418 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001419 if (!primary_if)
1420 goto handled;
1421
1422 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1423 goto allow;
1424
1425
Sven Eckelmann807736f2012-07-15 22:26:51 +02001426 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001427 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001428 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001429 goto handled;
1430
1431 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1432 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001433 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001434
1435 if (!claim) {
1436 /* possible optimization: race for a claim */
1437 /* No claim exists yet, claim it for us!
1438 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001439 batadv_handle_claim(bat_priv, primary_if,
1440 primary_if->net_dev->dev_addr,
1441 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001442 goto allow;
1443 }
1444
1445 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001446 if (batadv_compare_eth(claim->backbone_gw->orig,
1447 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001448 /* ... allow it in any case */
1449 claim->lasttime = jiffies;
1450 goto allow;
1451 }
1452
1453 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001454 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1455 /* ... drop it. the responsible gateway is in charge.
1456 *
1457 * We need to check is_bcast because with the gateway
1458 * feature, broadcasts (like DHCP requests) may be sent
1459 * using a unicast packet type.
1460 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001461 goto handled;
1462 } else {
1463 /* seems the client considers us as its best gateway.
1464 * send a claim and update the claim table
1465 * immediately.
1466 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001467 batadv_handle_claim(bat_priv, primary_if,
1468 primary_if->net_dev->dev_addr,
1469 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001470 goto allow;
1471 }
1472allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001473 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001474 ret = 0;
1475 goto out;
1476
1477handled:
1478 kfree_skb(skb);
1479 ret = 1;
1480
1481out:
1482 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001483 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001484 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001485 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001486 return ret;
1487}
1488
Ben Hutchings2c530402012-07-10 10:55:09 +00001489/**
1490 * batadv_bla_tx
1491 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001492 * @skb: the frame to be checked
1493 * @vid: the VLAN ID of the frame
1494 *
1495 * bla_tx checks if:
1496 * * a claim was received which has to be processed
1497 * * the frame is allowed on the mesh
1498 *
1499 * in these cases, the skb is further handled by this function and
1500 * returns 1, otherwise it returns 0 and the caller shall further
1501 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001502 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001503int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001504{
1505 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001506 struct batadv_claim search_claim, *claim = NULL;
1507 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001508 int ret = 0;
1509
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001510 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001511 if (!primary_if)
1512 goto out;
1513
1514 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1515 goto allow;
1516
1517 /* in VLAN case, the mac header might not be set. */
1518 skb_reset_mac_header(skb);
1519
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001520 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001521 goto handled;
1522
1523 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1524
Sven Eckelmann807736f2012-07-15 22:26:51 +02001525 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
Simon Wunderlich23721382012-01-22 20:00:19 +01001526 /* don't allow broadcasts while requests are in flight */
1527 if (is_multicast_ether_addr(ethhdr->h_dest))
1528 goto handled;
1529
1530 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1531 search_claim.vid = vid;
1532
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001533 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001534
1535 /* if no claim exists, allow it. */
1536 if (!claim)
1537 goto allow;
1538
1539 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001540 if (batadv_compare_eth(claim->backbone_gw->orig,
1541 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001542 /* if yes, the client has roamed and we have
1543 * to unclaim it.
1544 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001545 batadv_handle_unclaim(bat_priv, primary_if,
1546 primary_if->net_dev->dev_addr,
1547 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001548 goto allow;
1549 }
1550
1551 /* check if it is a multicast/broadcast frame */
1552 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1553 /* drop it. the responsible gateway has forwarded it into
1554 * the backbone network.
1555 */
1556 goto handled;
1557 } else {
1558 /* we must allow it. at least if we are
1559 * responsible for the DESTINATION.
1560 */
1561 goto allow;
1562 }
1563allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001564 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001565 ret = 0;
1566 goto out;
1567handled:
1568 ret = 1;
1569out:
1570 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001571 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001572 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001573 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001574 return ret;
1575}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001576
Sven Eckelmann08adf152012-05-12 13:38:47 +02001577int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001578{
1579 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001580 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001581 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001582 struct batadv_claim *claim;
1583 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001584 struct hlist_node *node;
1585 struct hlist_head *head;
1586 uint32_t i;
1587 bool is_own;
1588 int ret = 0;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001589 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001590
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001591 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001592 if (!primary_if) {
1593 ret = seq_printf(seq,
1594 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1595 net_dev->name);
1596 goto out;
1597 }
1598
Sven Eckelmanne9a4f292012-06-03 22:19:19 +02001599 if (primary_if->if_status != BATADV_IF_ACTIVE) {
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001600 ret = seq_printf(seq,
1601 "BATMAN mesh %s disabled - primary interface not active\n",
1602 net_dev->name);
1603 goto out;
1604 }
1605
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001606 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001607 seq_printf(seq,
1608 "Claims announced for the mesh %s (orig %pM, group id %04x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001609 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001610 ntohs(bat_priv->bla.claim_dest.group));
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001611 seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n",
1612 "Client", "VID", "Originator", "CRC");
1613 for (i = 0; i < hash->size; i++) {
1614 head = &hash->table[i];
1615
1616 rcu_read_lock();
1617 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001618 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1619 primary_addr);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001620 seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n",
1621 claim->addr, claim->vid,
1622 claim->backbone_gw->orig,
1623 (is_own ? 'x' : ' '),
1624 claim->backbone_gw->crc);
1625 }
1626 rcu_read_unlock();
1627 }
1628out:
1629 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001630 batadv_hardif_free_ref(primary_if);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001631 return ret;
1632}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001633
1634int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1635{
1636 struct net_device *net_dev = (struct net_device *)seq->private;
1637 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann807736f2012-07-15 22:26:51 +02001638 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001639 struct batadv_backbone_gw *backbone_gw;
1640 struct batadv_hard_iface *primary_if;
1641 struct hlist_node *node;
1642 struct hlist_head *head;
1643 int secs, msecs;
1644 uint32_t i;
1645 bool is_own;
1646 int ret = 0;
1647 uint8_t *primary_addr;
1648
1649 primary_if = batadv_primary_if_get_selected(bat_priv);
1650 if (!primary_if) {
1651 ret = seq_printf(seq,
1652 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1653 net_dev->name);
1654 goto out;
1655 }
1656
1657 if (primary_if->if_status != BATADV_IF_ACTIVE) {
1658 ret = seq_printf(seq,
1659 "BATMAN mesh %s disabled - primary interface not active\n",
1660 net_dev->name);
1661 goto out;
1662 }
1663
1664 primary_addr = primary_if->net_dev->dev_addr;
1665 seq_printf(seq,
1666 "Backbones announced for the mesh %s (orig %pM, group id %04x)\n",
1667 net_dev->name, primary_addr,
Sven Eckelmann807736f2012-07-15 22:26:51 +02001668 ntohs(bat_priv->bla.claim_dest.group));
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001669 seq_printf(seq, " %-17s %-5s %-9s (%-4s)\n",
1670 "Originator", "VID", "last seen", "CRC");
1671 for (i = 0; i < hash->size; i++) {
1672 head = &hash->table[i];
1673
1674 rcu_read_lock();
1675 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1676 msecs = jiffies_to_msecs(jiffies -
1677 backbone_gw->lasttime);
1678 secs = msecs / 1000;
1679 msecs = msecs % 1000;
1680
1681 is_own = batadv_compare_eth(backbone_gw->orig,
1682 primary_addr);
1683 if (is_own)
1684 continue;
1685
1686 seq_printf(seq,
1687 " * %pM on % 5d % 4i.%03is (%04x)\n",
1688 backbone_gw->orig, backbone_gw->vid,
1689 secs, msecs, backbone_gw->crc);
1690 }
1691 rcu_read_unlock();
1692 }
1693out:
1694 if (primary_if)
1695 batadv_hardif_free_ref(primary_if);
1696 return ret;
1697}