blob: 5f1ad80d5163027e7f1b0970705e491b22bf66f8 [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 Eckelmann5bf74e92012-06-05 22:31:28 +0200136 struct batadv_hashtable *hash = bat_priv->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 Eckelmann5bf74e92012-06-05 22:31:28 +0200177 struct batadv_hashtable *hash = bat_priv->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
221 hash = backbone_gw->bat_priv->claim_hash;
222 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
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100268 memcpy(&local_claim_dest, &bat_priv->claim_dest,
269 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) {
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200298 case BATADV_CLAIM_TYPE_ADD:
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;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200306 case BATADV_CLAIM_TYPE_DEL:
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);
343 bat_priv->stats.rx_packets++;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100344 bat_priv->stats.rx_bytes += skb->len + ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100345 soft_iface->last_rx = jiffies;
346
347 netif_rx(skb);
348out:
349 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200350 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100351}
352
Ben Hutchings2c530402012-07-10 10:55:09 +0000353/**
354 * batadv_bla_get_backbone_gw
355 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100356 * @orig: the mac address of the originator
357 * @vid: the VLAN ID
358 *
359 * searches for the backbone gw or creates a new one if it could not
360 * be found.
361 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200362static struct batadv_backbone_gw *
363batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
364 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100365{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200366 struct batadv_backbone_gw *entry;
367 struct batadv_orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100368 int hash_added;
369
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200370 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100371
372 if (entry)
373 return entry;
374
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200375 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200376 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
377 orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100378
379 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
380 if (!entry)
381 return NULL;
382
383 entry->vid = vid;
384 entry->lasttime = jiffies;
Sven Eckelmann3964f722012-06-03 22:19:10 +0200385 entry->crc = BATADV_BLA_CRC_INIT;
Simon Wunderlich23721382012-01-22 20:00:19 +0100386 entry->bat_priv = bat_priv;
387 atomic_set(&entry->request_sent, 0);
388 memcpy(entry->orig, orig, ETH_ALEN);
389
390 /* one for the hash, one for returning */
391 atomic_set(&entry->refcount, 2);
392
Sven Eckelmannc0a55922012-05-12 13:48:55 +0200393 hash_added = batadv_hash_add(bat_priv->backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200394 batadv_compare_backbone_gw,
395 batadv_choose_backbone_gw, entry,
396 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100397
398 if (unlikely(hash_added != 0)) {
399 /* hash failed, free the structure */
400 kfree(entry);
401 return NULL;
402 }
403
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100404 /* this is a gateway now, remove any tt entries */
Sven Eckelmannda641192012-05-12 13:48:56 +0200405 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100406 if (orig_node) {
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200407 batadv_tt_global_del_orig(bat_priv, orig_node,
408 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200409 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100410 }
Simon Wunderlich23721382012-01-22 20:00:19 +0100411 return entry;
412}
413
414/* update or add the own backbone gw to make sure we announce
415 * where we receive other backbone gws
416 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200417static void
418batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
419 struct batadv_hard_iface *primary_if,
420 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100421{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200422 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100423
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200424 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
425 primary_if->net_dev->dev_addr,
426 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100427 if (unlikely(!backbone_gw))
428 return;
429
430 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200431 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100432}
433
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200434/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100435 * @vid: the vid where the request came on
436 *
437 * Repeat all of our own claims, and finally send an ANNOUNCE frame
438 * to allow the requester another check if the CRC is correct now.
439 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200440static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
441 struct batadv_hard_iface *primary_if,
442 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100443{
444 struct hlist_node *node;
445 struct hlist_head *head;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +0200446 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200447 struct batadv_claim *claim;
448 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +0100449 int i;
450
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200451 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200452 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100453
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200454 backbone_gw = batadv_backbone_hash_find(bat_priv,
455 primary_if->net_dev->dev_addr,
456 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100457 if (!backbone_gw)
458 return;
459
460 hash = bat_priv->claim_hash;
461 for (i = 0; i < hash->size; i++) {
462 head = &hash->table[i];
463
464 rcu_read_lock();
465 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
466 /* only own claims are interesting */
467 if (claim->backbone_gw != backbone_gw)
468 continue;
469
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200470 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200471 BATADV_CLAIM_TYPE_ADD);
Simon Wunderlich23721382012-01-22 20:00:19 +0100472 }
473 rcu_read_unlock();
474 }
475
476 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200477 batadv_bla_send_announce(bat_priv, backbone_gw);
478 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100479}
480
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200481/* @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100482 *
483 * When the crc is wrong, ask the backbone gateway for a full table update.
484 * After the request, it will repeat all of his own claims and finally
485 * send an announcement claim with which we can check again.
486 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200487static void batadv_bla_send_request(struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100488{
489 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200490 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100491
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200492 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
493 "Sending REQUEST to %pM\n", backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100494
495 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200496 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200497 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100498
499 /* no local broadcasts should be sent or received, for now. */
500 if (!atomic_read(&backbone_gw->request_sent)) {
501 atomic_inc(&backbone_gw->bat_priv->bla_num_requests);
502 atomic_set(&backbone_gw->request_sent, 1);
503 }
504}
505
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200506/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100507 * @backbone_gw: our backbone gateway which should be announced
508 *
509 * This function sends an announcement. It is called from multiple
510 * places.
511 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200512static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
513 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100514{
515 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100516 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100517
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200518 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100519 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100520 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100521
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200522 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200523 BATADV_CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100524
525}
526
Ben Hutchings2c530402012-07-10 10:55:09 +0000527/**
528 * batadv_bla_add_claim - Adds a claim in the claim hash
529 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100530 * @mac: the mac address of the claim
531 * @vid: the VLAN ID of the frame
532 * @backbone_gw: the backbone gateway which claims it
Simon Wunderlich23721382012-01-22 20:00:19 +0100533 */
Sven Eckelmann56303d32012-06-05 22:31:31 +0200534static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
535 const uint8_t *mac, const short vid,
536 struct batadv_backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100537{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200538 struct batadv_claim *claim;
539 struct batadv_claim search_claim;
Simon Wunderlich23721382012-01-22 20:00:19 +0100540 int hash_added;
541
542 memcpy(search_claim.addr, mac, ETH_ALEN);
543 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200544 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100545
546 /* create a new claim entry if it does not exist yet. */
547 if (!claim) {
548 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
549 if (!claim)
550 return;
551
552 memcpy(claim->addr, mac, ETH_ALEN);
553 claim->vid = vid;
554 claim->lasttime = jiffies;
555 claim->backbone_gw = backbone_gw;
556
557 atomic_set(&claim->refcount, 2);
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200558 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200559 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
560 mac, vid);
Sven Eckelmannc0a55922012-05-12 13:48:55 +0200561 hash_added = batadv_hash_add(bat_priv->claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200562 batadv_compare_claim,
563 batadv_choose_claim, claim,
564 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100565
566 if (unlikely(hash_added != 0)) {
567 /* only local changes happened. */
568 kfree(claim);
569 return;
570 }
571 } else {
572 claim->lasttime = jiffies;
573 if (claim->backbone_gw == backbone_gw)
574 /* no need to register a new backbone */
575 goto claim_free_ref;
576
Sven Eckelmann39c75a52012-06-03 22:19:22 +0200577 batadv_dbg(BATADV_DBG_BLA, bat_priv,
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200578 "bla_add_claim(): changing ownership for %pM, vid %d\n",
579 mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100580
581 claim->backbone_gw->crc ^=
582 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 Eckelmann3b300de2012-05-12 18:33:53 +0200614 batadv_hash_remove(bat_priv->claim_hash, batadv_compare_claim,
615 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)) {
661 atomic_dec(&backbone_gw->bat_priv->bla_num_requests);
662 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,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200706 BATADV_CLAIM_TYPE_DEL);
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,
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200742 BATADV_CLAIM_TYPE_ADD);
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;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100776 bla_dst_own = &bat_priv->claim_dest;
777
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) {
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200787 case BATADV_CLAIM_TYPE_ADD:
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:
792 case BATADV_CLAIM_TYPE_DEL:
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) {
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200908 case BATADV_CLAIM_TYPE_ADD:
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;
Sven Eckelmannacd34af2012-06-03 22:19:21 +0200913 case BATADV_CLAIM_TYPE_DEL:
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
949 hash = bat_priv->backbone_hash;
950 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))
973 atomic_dec(&bat_priv->bla_num_requests);
974
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
1003 hash = bat_priv->claim_hash;
1004 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;
Simon Wunderlich23721382012-01-22 20:00:19 +01001050 int i;
1051
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001052 /* reset bridge loop avoidance group id */
1053 bat_priv->claim_dest.group =
1054 htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1055
Simon Wunderlich23721382012-01-22 20:00:19 +01001056 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001057 batadv_bla_purge_claims(bat_priv, NULL, 1);
1058 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001059 return;
1060 }
1061
1062 hash = bat_priv->backbone_hash;
1063 if (!hash)
1064 return;
1065
1066 for (i = 0; i < hash->size; i++) {
1067 head = &hash->table[i];
1068
1069 rcu_read_lock();
1070 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1071 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001072 if (!batadv_compare_eth(backbone_gw->orig,
1073 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001074 continue;
1075
1076 memcpy(backbone_gw->orig,
1077 primary_if->net_dev->dev_addr, ETH_ALEN);
1078 /* send an announce frame so others will ask for our
1079 * claims and update their tables.
1080 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001081 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001082 }
1083 rcu_read_unlock();
1084 }
1085}
1086
1087
1088
1089/* (re)start the timer */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001090static void batadv_bla_start_timer(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001091{
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001092 INIT_DELAYED_WORK(&bat_priv->bla_work, batadv_bla_periodic_work);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +02001093 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work,
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001094 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
Simon Wunderlich23721382012-01-22 20:00:19 +01001095}
1096
1097/* periodic work to do:
1098 * * purge structures when they are too old
1099 * * send announcements
1100 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001101static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001102{
1103 struct delayed_work *delayed_work =
1104 container_of(work, struct delayed_work, work);
Sven Eckelmann56303d32012-06-05 22:31:31 +02001105 struct batadv_priv *bat_priv;
Simon Wunderlich23721382012-01-22 20:00:19 +01001106 struct hlist_node *node;
1107 struct hlist_head *head;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001108 struct batadv_backbone_gw *backbone_gw;
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001109 struct batadv_hashtable *hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001110 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001111 int i;
1112
Sven Eckelmann56303d32012-06-05 22:31:31 +02001113 bat_priv = container_of(delayed_work, struct batadv_priv, bla_work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001114 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001115 if (!primary_if)
1116 goto out;
1117
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001118 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1119 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001120
1121 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1122 goto out;
1123
1124 hash = bat_priv->backbone_hash;
1125 if (!hash)
1126 goto out;
1127
1128 for (i = 0; i < hash->size; i++) {
1129 head = &hash->table[i];
1130
1131 rcu_read_lock();
1132 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001133 if (!batadv_compare_eth(backbone_gw->orig,
1134 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001135 continue;
1136
1137 backbone_gw->lasttime = jiffies;
1138
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001139 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001140 }
1141 rcu_read_unlock();
1142 }
1143out:
1144 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001145 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001146
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001147 batadv_bla_start_timer(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001148}
1149
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001150/* The hash for claim and backbone hash receive the same key because they
1151 * are getting initialized by hash_new with the same key. Reinitializing
1152 * them with to different keys to allow nested locking without generating
1153 * lockdep warnings
1154 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001155static struct lock_class_key batadv_claim_hash_lock_class_key;
1156static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001157
Simon Wunderlich23721382012-01-22 20:00:19 +01001158/* initialize all bla structures */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001159int batadv_bla_init(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001160{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001161 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001162 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
Sven Eckelmann56303d32012-06-05 22:31:31 +02001163 struct batadv_hard_iface *primary_if;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001164
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001165 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001166
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001167 /* setting claim destination address */
1168 memcpy(&bat_priv->claim_dest.magic, claim_dest, 3);
1169 bat_priv->claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001170 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001171 if (primary_if) {
1172 bat_priv->claim_dest.group =
1173 htons(crc16(0, primary_if->net_dev->dev_addr,
1174 ETH_ALEN));
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001175 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001176 } else {
1177 bat_priv->claim_dest.group = 0; /* will be set later */
1178 }
1179
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001180 /* initialize the duplicate list */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001181 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001182 bat_priv->bcast_duplist[i].entrytime =
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001183 jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001184 bat_priv->bcast_duplist_curr = 0;
1185
Simon Wunderlich23721382012-01-22 20:00:19 +01001186 if (bat_priv->claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001187 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001188
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001189 bat_priv->claim_hash = batadv_hash_new(128);
1190 bat_priv->backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001191
1192 if (!bat_priv->claim_hash || !bat_priv->backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001193 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001194
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001195 batadv_hash_set_lock_class(bat_priv->claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001196 &batadv_claim_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001197 batadv_hash_set_lock_class(bat_priv->backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001198 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001199
Sven Eckelmann39c75a52012-06-03 22:19:22 +02001200 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001201
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001202 batadv_bla_start_timer(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +02001203 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001204}
1205
Ben Hutchings2c530402012-07-10 10:55:09 +00001206/**
1207 * batadv_bla_check_bcast_duplist
1208 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001209 * @bcast_packet: originator mac address
1210 * @hdr_size: maximum length of the frame
1211 *
1212 * check if it is on our broadcast list. Another gateway might
1213 * have sent the same packet because it is connected to the same backbone,
1214 * so we have to remove this duplicate.
1215 *
1216 * This is performed by checking the CRC, which will tell us
1217 * with a good chance that it is the same packet. If it is furthermore
1218 * sent by another host, drop it. We allow equal packets from
1219 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001220 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001221int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
Sven Eckelmann96412692012-06-05 22:31:30 +02001222 struct batadv_bcast_packet *bcast_packet,
Sven Eckelmann08adf152012-05-12 13:38:47 +02001223 int hdr_size)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001224{
1225 int i, length, curr;
1226 uint8_t *content;
1227 uint16_t crc;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001228 struct batadv_bcast_duplist_entry *entry;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001229
1230 length = hdr_size - sizeof(*bcast_packet);
1231 content = (uint8_t *)bcast_packet;
1232 content += sizeof(*bcast_packet);
1233
1234 /* calculate the crc ... */
1235 crc = crc16(0, content, length);
1236
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001237 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1238 curr = (bat_priv->bcast_duplist_curr + i) % BATADV_DUPLIST_SIZE;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001239 entry = &bat_priv->bcast_duplist[curr];
1240
1241 /* we can stop searching if the entry is too old ;
1242 * later entries will be even older
1243 */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001244 if (batadv_has_timed_out(entry->entrytime,
1245 BATADV_DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001246 break;
1247
1248 if (entry->crc != crc)
1249 continue;
1250
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001251 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001252 continue;
1253
1254 /* this entry seems to match: same crc, not too old,
1255 * and from another gw. therefore return 1 to forbid it.
1256 */
1257 return 1;
1258 }
1259 /* not found, add a new entry (overwrite the oldest entry) */
Sven Eckelmann42d0b042012-06-03 22:19:17 +02001260 curr = (bat_priv->bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1261 curr %= BATADV_DUPLIST_SIZE;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001262 entry = &bat_priv->bcast_duplist[curr];
1263 entry->crc = crc;
1264 entry->entrytime = jiffies;
1265 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
1266 bat_priv->bcast_duplist_curr = curr;
1267
1268 /* allow it, its the first occurence. */
1269 return 0;
1270}
1271
1272
1273
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001274/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001275 * @orig: originator mac address
1276 *
1277 * check if the originator is a gateway for any VLAN ID.
1278 *
1279 * returns 1 if it is found, 0 otherwise
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001280 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001281int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001282{
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001283 struct batadv_hashtable *hash = bat_priv->backbone_hash;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001284 struct hlist_head *head;
1285 struct hlist_node *node;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001286 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001287 int i;
1288
1289 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1290 return 0;
1291
1292 if (!hash)
1293 return 0;
1294
1295 for (i = 0; i < hash->size; i++) {
1296 head = &hash->table[i];
1297
1298 rcu_read_lock();
1299 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001300 if (batadv_compare_eth(backbone_gw->orig, orig)) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001301 rcu_read_unlock();
1302 return 1;
1303 }
1304 }
1305 rcu_read_unlock();
1306 }
1307
1308 return 0;
1309}
1310
1311
Ben Hutchings2c530402012-07-10 10:55:09 +00001312/**
1313 * batadv_bla_is_backbone_gw
1314 * @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001315 * @orig_node: the orig_node of the frame
1316 * @hdr_size: maximum length of the frame
1317 *
1318 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1319 * if the orig_node is also a gateway on the soft interface, otherwise it
1320 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001321 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001322int batadv_bla_is_backbone_gw(struct sk_buff *skb,
Sven Eckelmann56303d32012-06-05 22:31:31 +02001323 struct batadv_orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001324{
1325 struct ethhdr *ethhdr;
1326 struct vlan_ethhdr *vhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001327 struct batadv_backbone_gw *backbone_gw;
Simon Wunderlich23721382012-01-22 20:00:19 +01001328 short vid = -1;
1329
1330 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1331 return 0;
1332
1333 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001334 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001335 return 0;
1336
1337 ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
1338
1339 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
1340 if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
1341 return 0;
1342
1343 vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) +
1344 hdr_size);
1345 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
1346 }
1347
1348 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001349 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1350 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001351 if (!backbone_gw)
1352 return 0;
1353
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001354 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001355 return 1;
1356}
1357
1358/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001359void batadv_bla_free(struct batadv_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001360{
Sven Eckelmann56303d32012-06-05 22:31:31 +02001361 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001362
1363 cancel_delayed_work_sync(&bat_priv->bla_work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001364 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001365
1366 if (bat_priv->claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001367 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001368 batadv_hash_destroy(bat_priv->claim_hash);
Simon Wunderlich23721382012-01-22 20:00:19 +01001369 bat_priv->claim_hash = NULL;
1370 }
1371 if (bat_priv->backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001372 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001373 batadv_hash_destroy(bat_priv->backbone_hash);
Simon Wunderlich23721382012-01-22 20:00:19 +01001374 bat_priv->backbone_hash = NULL;
1375 }
1376 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001377 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001378}
1379
Ben Hutchings2c530402012-07-10 10:55:09 +00001380/**
1381 * batadv_bla_rx
1382 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001383 * @skb: the frame to be checked
1384 * @vid: the VLAN ID of the frame
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001385 * @is_bcast: the packet came in a broadcast packet type.
Simon Wunderlich23721382012-01-22 20:00:19 +01001386 *
1387 * bla_rx avoidance checks if:
1388 * * we have to race for a claim
1389 * * if the frame is allowed on the LAN
1390 *
1391 * in these cases, the skb is further handled by this function and
1392 * returns 1, otherwise it returns 0 and the caller shall further
1393 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001394 */
David S. Miller04c9f412012-07-10 23:56:33 -07001395int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid,
1396 bool is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001397{
1398 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001399 struct batadv_claim search_claim, *claim = NULL;
1400 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001401 int ret;
1402
1403 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1404
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001405 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001406 if (!primary_if)
1407 goto handled;
1408
1409 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1410 goto allow;
1411
1412
1413 if (unlikely(atomic_read(&bat_priv->bla_num_requests)))
1414 /* don't allow broadcasts while requests are in flight */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001415 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
Simon Wunderlich23721382012-01-22 20:00:19 +01001416 goto handled;
1417
1418 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1419 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001420 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001421
1422 if (!claim) {
1423 /* possible optimization: race for a claim */
1424 /* No claim exists yet, claim it for us!
1425 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001426 batadv_handle_claim(bat_priv, primary_if,
1427 primary_if->net_dev->dev_addr,
1428 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001429 goto allow;
1430 }
1431
1432 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001433 if (batadv_compare_eth(claim->backbone_gw->orig,
1434 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001435 /* ... allow it in any case */
1436 claim->lasttime = jiffies;
1437 goto allow;
1438 }
1439
1440 /* if it is a broadcast ... */
Simon Wunderlich2d3f6cc2012-07-04 20:38:19 +02001441 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1442 /* ... drop it. the responsible gateway is in charge.
1443 *
1444 * We need to check is_bcast because with the gateway
1445 * feature, broadcasts (like DHCP requests) may be sent
1446 * using a unicast packet type.
1447 */
Simon Wunderlich23721382012-01-22 20:00:19 +01001448 goto handled;
1449 } else {
1450 /* seems the client considers us as its best gateway.
1451 * send a claim and update the claim table
1452 * immediately.
1453 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001454 batadv_handle_claim(bat_priv, primary_if,
1455 primary_if->net_dev->dev_addr,
1456 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001457 goto allow;
1458 }
1459allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001460 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001461 ret = 0;
1462 goto out;
1463
1464handled:
1465 kfree_skb(skb);
1466 ret = 1;
1467
1468out:
1469 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001470 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001471 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001472 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001473 return ret;
1474}
1475
Ben Hutchings2c530402012-07-10 10:55:09 +00001476/**
1477 * batadv_bla_tx
1478 * @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001479 * @skb: the frame to be checked
1480 * @vid: the VLAN ID of the frame
1481 *
1482 * bla_tx checks if:
1483 * * a claim was received which has to be processed
1484 * * the frame is allowed on the mesh
1485 *
1486 * in these cases, the skb is further handled by this function and
1487 * returns 1, otherwise it returns 0 and the caller shall further
1488 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001489 */
Sven Eckelmann56303d32012-06-05 22:31:31 +02001490int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001491{
1492 struct ethhdr *ethhdr;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001493 struct batadv_claim search_claim, *claim = NULL;
1494 struct batadv_hard_iface *primary_if;
Simon Wunderlich23721382012-01-22 20:00:19 +01001495 int ret = 0;
1496
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001497 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001498 if (!primary_if)
1499 goto out;
1500
1501 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1502 goto allow;
1503
1504 /* in VLAN case, the mac header might not be set. */
1505 skb_reset_mac_header(skb);
1506
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001507 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001508 goto handled;
1509
1510 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1511
1512 if (unlikely(atomic_read(&bat_priv->bla_num_requests)))
1513 /* don't allow broadcasts while requests are in flight */
1514 if (is_multicast_ether_addr(ethhdr->h_dest))
1515 goto handled;
1516
1517 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1518 search_claim.vid = vid;
1519
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001520 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001521
1522 /* if no claim exists, allow it. */
1523 if (!claim)
1524 goto allow;
1525
1526 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001527 if (batadv_compare_eth(claim->backbone_gw->orig,
1528 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001529 /* if yes, the client has roamed and we have
1530 * to unclaim it.
1531 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001532 batadv_handle_unclaim(bat_priv, primary_if,
1533 primary_if->net_dev->dev_addr,
1534 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001535 goto allow;
1536 }
1537
1538 /* check if it is a multicast/broadcast frame */
1539 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1540 /* drop it. the responsible gateway has forwarded it into
1541 * the backbone network.
1542 */
1543 goto handled;
1544 } else {
1545 /* we must allow it. at least if we are
1546 * responsible for the DESTINATION.
1547 */
1548 goto allow;
1549 }
1550allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001551 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001552 ret = 0;
1553 goto out;
1554handled:
1555 ret = 1;
1556out:
1557 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001558 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001559 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001560 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001561 return ret;
1562}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001563
Sven Eckelmann08adf152012-05-12 13:38:47 +02001564int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001565{
1566 struct net_device *net_dev = (struct net_device *)seq->private;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001567 struct batadv_priv *bat_priv = netdev_priv(net_dev);
Sven Eckelmann5bf74e92012-06-05 22:31:28 +02001568 struct batadv_hashtable *hash = bat_priv->claim_hash;
Sven Eckelmann56303d32012-06-05 22:31:31 +02001569 struct batadv_claim *claim;
1570 struct batadv_hard_iface *primary_if;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001571 struct hlist_node *node;
1572 struct hlist_head *head;
1573 uint32_t i;
1574 bool is_own;
1575 int ret = 0;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001576 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001577
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001578 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001579 if (!primary_if) {
1580 ret = seq_printf(seq,
1581 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1582 net_dev->name);
1583 goto out;
1584 }
1585
Sven Eckelmanne9a4f292012-06-03 22:19:19 +02001586 if (primary_if->if_status != BATADV_IF_ACTIVE) {
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001587 ret = seq_printf(seq,
1588 "BATMAN mesh %s disabled - primary interface not active\n",
1589 net_dev->name);
1590 goto out;
1591 }
1592
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001593 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001594 seq_printf(seq,
1595 "Claims announced for the mesh %s (orig %pM, group id %04x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001596 net_dev->name, primary_addr,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001597 ntohs(bat_priv->claim_dest.group));
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001598 seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n",
1599 "Client", "VID", "Originator", "CRC");
1600 for (i = 0; i < hash->size; i++) {
1601 head = &hash->table[i];
1602
1603 rcu_read_lock();
1604 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001605 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1606 primary_addr);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001607 seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n",
1608 claim->addr, claim->vid,
1609 claim->backbone_gw->orig,
1610 (is_own ? 'x' : ' '),
1611 claim->backbone_gw->crc);
1612 }
1613 rcu_read_unlock();
1614 }
1615out:
1616 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001617 batadv_hardif_free_ref(primary_if);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001618 return ret;
1619}
Simon Wunderlich536a23f2012-06-18 18:39:26 +02001620
1621int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1622{
1623 struct net_device *net_dev = (struct net_device *)seq->private;
1624 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1625 struct batadv_hashtable *hash = bat_priv->backbone_hash;
1626 struct batadv_backbone_gw *backbone_gw;
1627 struct batadv_hard_iface *primary_if;
1628 struct hlist_node *node;
1629 struct hlist_head *head;
1630 int secs, msecs;
1631 uint32_t i;
1632 bool is_own;
1633 int ret = 0;
1634 uint8_t *primary_addr;
1635
1636 primary_if = batadv_primary_if_get_selected(bat_priv);
1637 if (!primary_if) {
1638 ret = seq_printf(seq,
1639 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1640 net_dev->name);
1641 goto out;
1642 }
1643
1644 if (primary_if->if_status != BATADV_IF_ACTIVE) {
1645 ret = seq_printf(seq,
1646 "BATMAN mesh %s disabled - primary interface not active\n",
1647 net_dev->name);
1648 goto out;
1649 }
1650
1651 primary_addr = primary_if->net_dev->dev_addr;
1652 seq_printf(seq,
1653 "Backbones announced for the mesh %s (orig %pM, group id %04x)\n",
1654 net_dev->name, primary_addr,
1655 ntohs(bat_priv->claim_dest.group));
1656 seq_printf(seq, " %-17s %-5s %-9s (%-4s)\n",
1657 "Originator", "VID", "last seen", "CRC");
1658 for (i = 0; i < hash->size; i++) {
1659 head = &hash->table[i];
1660
1661 rcu_read_lock();
1662 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1663 msecs = jiffies_to_msecs(jiffies -
1664 backbone_gw->lasttime);
1665 secs = msecs / 1000;
1666 msecs = msecs % 1000;
1667
1668 is_own = batadv_compare_eth(backbone_gw->orig,
1669 primary_addr);
1670 if (is_own)
1671 continue;
1672
1673 seq_printf(seq,
1674 " * %pM on % 5d % 4i.%03is (%04x)\n",
1675 backbone_gw->orig, backbone_gw->vid,
1676 secs, msecs, backbone_gw->crc);
1677 }
1678 rcu_read_unlock();
1679 }
1680out:
1681 if (primary_if)
1682 batadv_hardif_free_ref(primary_if);
1683 return ret;
1684}