blob: 0592d2bcb9b538a5f34d7f390920bcf999a92c2c [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);
37static void batadv_bla_send_announce(struct bat_priv *bat_priv,
38 struct 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{
86 const void *data1 = container_of(node, struct backbone_gw,
87 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{
96 const void *data1 = container_of(node, struct claim,
97 hash_entry);
98
99 return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0);
100}
101
102/* free a backbone gw */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200103static void batadv_backbone_gw_free_ref(struct 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{
112 struct claim *claim;
113
114 claim = container_of(rcu, struct claim, rcu);
115
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 Eckelmann3b300de2012-05-12 18:33:53 +0200121static void batadv_claim_free_ref(struct 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 Eckelmann3b300de2012-05-12 18:33:53 +0200133static struct claim *batadv_claim_hash_find(struct bat_priv *bat_priv,
134 struct claim *data)
Simon Wunderlich23721382012-01-22 20:00:19 +0100135{
136 struct hashtable_t *hash = bat_priv->claim_hash;
137 struct hlist_head *head;
138 struct hlist_node *node;
139 struct claim *claim;
140 struct claim *claim_tmp = NULL;
141 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
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200165/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100166 * @addr: the address of the originator
167 * @vid: the VLAN ID
168 *
169 * looks for a claim in the hash, and returns it if found
170 * or NULL otherwise.
171 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200172static struct backbone_gw *batadv_backbone_hash_find(struct bat_priv *bat_priv,
173 uint8_t *addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100174{
175 struct hashtable_t *hash = bat_priv->backbone_hash;
176 struct hlist_head *head;
177 struct hlist_node *node;
178 struct backbone_gw search_entry, *backbone_gw;
179 struct backbone_gw *backbone_gw_tmp = NULL;
180 int index;
181
182 if (!hash)
183 return NULL;
184
185 memcpy(search_entry.orig, addr, ETH_ALEN);
186 search_entry.vid = vid;
187
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200188 index = batadv_choose_backbone_gw(&search_entry, hash->size);
Simon Wunderlich23721382012-01-22 20:00:19 +0100189 head = &hash->table[index];
190
191 rcu_read_lock();
192 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200193 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
194 &search_entry))
Simon Wunderlich23721382012-01-22 20:00:19 +0100195 continue;
196
197 if (!atomic_inc_not_zero(&backbone_gw->refcount))
198 continue;
199
200 backbone_gw_tmp = backbone_gw;
201 break;
202 }
203 rcu_read_unlock();
204
205 return backbone_gw_tmp;
206}
207
208/* delete all claims for a backbone */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200209static void batadv_bla_del_backbone_claims(struct backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100210{
211 struct hashtable_t *hash;
212 struct hlist_node *node, *node_tmp;
213 struct hlist_head *head;
214 struct claim *claim;
215 int i;
216 spinlock_t *list_lock; /* protects write access to the hash lists */
217
218 hash = backbone_gw->bat_priv->claim_hash;
219 if (!hash)
220 return;
221
222 for (i = 0; i < hash->size; i++) {
223 head = &hash->table[i];
224 list_lock = &hash->list_locks[i];
225
226 spin_lock_bh(list_lock);
227 hlist_for_each_entry_safe(claim, node, node_tmp,
228 head, hash_entry) {
229
230 if (claim->backbone_gw != backbone_gw)
231 continue;
232
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200233 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100234 hlist_del_rcu(node);
235 }
236 spin_unlock_bh(list_lock);
237 }
238
239 /* all claims gone, intialize CRC */
240 backbone_gw->crc = BLA_CRC_INIT;
241}
242
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200243/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100244 * @orig: the mac address to be announced within the claim
245 * @vid: the VLAN ID
246 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
247 *
248 * sends a claim frame according to the provided info.
249 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200250static void batadv_bla_send_claim(struct bat_priv *bat_priv, uint8_t *mac,
251 short vid, int claimtype)
Simon Wunderlich23721382012-01-22 20:00:19 +0100252{
253 struct sk_buff *skb;
254 struct ethhdr *ethhdr;
255 struct hard_iface *primary_if;
256 struct net_device *soft_iface;
257 uint8_t *hw_src;
258 struct bla_claim_dst local_claim_dest;
Al Viro3e2f1a12012-04-22 07:47:50 +0100259 __be32 zeroip = 0;
Simon Wunderlich23721382012-01-22 20:00:19 +0100260
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200261 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +0100262 if (!primary_if)
263 return;
264
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100265 memcpy(&local_claim_dest, &bat_priv->claim_dest,
266 sizeof(local_claim_dest));
Simon Wunderlich23721382012-01-22 20:00:19 +0100267 local_claim_dest.type = claimtype;
268
269 soft_iface = primary_if->soft_iface;
270
271 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
272 /* IP DST: 0.0.0.0 */
273 zeroip,
274 primary_if->soft_iface,
275 /* IP SRC: 0.0.0.0 */
276 zeroip,
277 /* Ethernet DST: Broadcast */
278 NULL,
279 /* Ethernet SRC/HW SRC: originator mac */
280 primary_if->net_dev->dev_addr,
281 /* HW DST: FF:43:05:XX:00:00
282 * with XX = claim type
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100283 * and YY:YY = group id
Simon Wunderlich23721382012-01-22 20:00:19 +0100284 */
285 (uint8_t *)&local_claim_dest);
286
287 if (!skb)
288 goto out;
289
290 ethhdr = (struct ethhdr *)skb->data;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100291 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
Simon Wunderlich23721382012-01-22 20:00:19 +0100292
293 /* now we pretend that the client would have sent this ... */
294 switch (claimtype) {
295 case CLAIM_TYPE_ADD:
296 /* normal claim frame
297 * set Ethernet SRC to the clients mac
298 */
299 memcpy(ethhdr->h_source, mac, ETH_ALEN);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200300 batadv_dbg(DBG_BLA, bat_priv,
301 "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100302 break;
303 case CLAIM_TYPE_DEL:
304 /* unclaim frame
305 * set HW SRC to the clients mac
306 */
307 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200308 batadv_dbg(DBG_BLA, bat_priv,
309 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
310 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100311 break;
312 case CLAIM_TYPE_ANNOUNCE:
313 /* announcement frame
314 * set HW SRC to the special mac containg the crc
315 */
316 memcpy(hw_src, mac, ETH_ALEN);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200317 batadv_dbg(DBG_BLA, bat_priv,
318 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
319 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100320 break;
321 case CLAIM_TYPE_REQUEST:
322 /* request frame
323 * set HW SRC to the special mac containg the crc
324 */
325 memcpy(hw_src, mac, ETH_ALEN);
326 memcpy(ethhdr->h_dest, mac, ETH_ALEN);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200327 batadv_dbg(DBG_BLA, bat_priv,
328 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
329 ethhdr->h_source, ethhdr->h_dest, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100330 break;
331
332 }
333
334 if (vid != -1)
335 skb = vlan_insert_tag(skb, vid);
336
337 skb_reset_mac_header(skb);
338 skb->protocol = eth_type_trans(skb, soft_iface);
339 bat_priv->stats.rx_packets++;
Antonio Quartulli0d125072012-02-18 11:27:34 +0100340 bat_priv->stats.rx_bytes += skb->len + ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100341 soft_iface->last_rx = jiffies;
342
343 netif_rx(skb);
344out:
345 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200346 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +0100347}
348
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200349/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100350 * @orig: the mac address of the originator
351 * @vid: the VLAN ID
352 *
353 * searches for the backbone gw or creates a new one if it could not
354 * be found.
355 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200356static struct backbone_gw *batadv_bla_get_backbone_gw(struct bat_priv *bat_priv,
357 uint8_t *orig, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100358{
359 struct backbone_gw *entry;
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100360 struct orig_node *orig_node;
Simon Wunderlich23721382012-01-22 20:00:19 +0100361 int hash_added;
362
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200363 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100364
365 if (entry)
366 return entry;
367
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200368 batadv_dbg(DBG_BLA, bat_priv,
369 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
370 orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100371
372 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
373 if (!entry)
374 return NULL;
375
376 entry->vid = vid;
377 entry->lasttime = jiffies;
378 entry->crc = BLA_CRC_INIT;
379 entry->bat_priv = bat_priv;
380 atomic_set(&entry->request_sent, 0);
381 memcpy(entry->orig, orig, ETH_ALEN);
382
383 /* one for the hash, one for returning */
384 atomic_set(&entry->refcount, 2);
385
Sven Eckelmannc0a55922012-05-12 13:48:55 +0200386 hash_added = batadv_hash_add(bat_priv->backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200387 batadv_compare_backbone_gw,
388 batadv_choose_backbone_gw, entry,
389 &entry->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100390
391 if (unlikely(hash_added != 0)) {
392 /* hash failed, free the structure */
393 kfree(entry);
394 return NULL;
395 }
396
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100397 /* this is a gateway now, remove any tt entries */
Sven Eckelmannda641192012-05-12 13:48:56 +0200398 orig_node = batadv_orig_hash_find(bat_priv, orig);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100399 if (orig_node) {
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200400 batadv_tt_global_del_orig(bat_priv, orig_node,
401 "became a backbone gateway");
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200402 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich20ff9d52012-01-22 20:00:23 +0100403 }
Simon Wunderlich23721382012-01-22 20:00:19 +0100404 return entry;
405}
406
407/* update or add the own backbone gw to make sure we announce
408 * where we receive other backbone gws
409 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200410static void batadv_bla_update_own_backbone_gw(struct bat_priv *bat_priv,
411 struct hard_iface *primary_if,
412 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100413{
414 struct backbone_gw *backbone_gw;
415
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200416 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
417 primary_if->net_dev->dev_addr,
418 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100419 if (unlikely(!backbone_gw))
420 return;
421
422 backbone_gw->lasttime = jiffies;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200423 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100424}
425
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200426/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100427 * @vid: the vid where the request came on
428 *
429 * Repeat all of our own claims, and finally send an ANNOUNCE frame
430 * to allow the requester another check if the CRC is correct now.
431 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200432static void batadv_bla_answer_request(struct bat_priv *bat_priv,
433 struct hard_iface *primary_if, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100434{
435 struct hlist_node *node;
436 struct hlist_head *head;
437 struct hashtable_t *hash;
438 struct claim *claim;
439 struct backbone_gw *backbone_gw;
440 int i;
441
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200442 batadv_dbg(DBG_BLA, bat_priv,
443 "bla_answer_request(): received a claim request, send all of our own claims again\n");
Simon Wunderlich23721382012-01-22 20:00:19 +0100444
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200445 backbone_gw = batadv_backbone_hash_find(bat_priv,
446 primary_if->net_dev->dev_addr,
447 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100448 if (!backbone_gw)
449 return;
450
451 hash = bat_priv->claim_hash;
452 for (i = 0; i < hash->size; i++) {
453 head = &hash->table[i];
454
455 rcu_read_lock();
456 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
457 /* only own claims are interesting */
458 if (claim->backbone_gw != backbone_gw)
459 continue;
460
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200461 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
462 CLAIM_TYPE_ADD);
Simon Wunderlich23721382012-01-22 20:00:19 +0100463 }
464 rcu_read_unlock();
465 }
466
467 /* finally, send an announcement frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200468 batadv_bla_send_announce(bat_priv, backbone_gw);
469 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100470}
471
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200472/* @backbone_gw: the backbone gateway from whom we are out of sync
Simon Wunderlich23721382012-01-22 20:00:19 +0100473 *
474 * When the crc is wrong, ask the backbone gateway for a full table update.
475 * After the request, it will repeat all of his own claims and finally
476 * send an announcement claim with which we can check again.
477 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200478static void batadv_bla_send_request(struct backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100479{
480 /* first, remove all old entries */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200481 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100482
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200483 batadv_dbg(DBG_BLA, backbone_gw->bat_priv, "Sending REQUEST to %pM\n",
484 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100485
486 /* send request */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200487 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
488 backbone_gw->vid, CLAIM_TYPE_REQUEST);
Simon Wunderlich23721382012-01-22 20:00:19 +0100489
490 /* no local broadcasts should be sent or received, for now. */
491 if (!atomic_read(&backbone_gw->request_sent)) {
492 atomic_inc(&backbone_gw->bat_priv->bla_num_requests);
493 atomic_set(&backbone_gw->request_sent, 1);
494 }
495}
496
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200497/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100498 * @backbone_gw: our backbone gateway which should be announced
499 *
500 * This function sends an announcement. It is called from multiple
501 * places.
502 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200503static void batadv_bla_send_announce(struct bat_priv *bat_priv,
504 struct backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100505{
506 uint8_t mac[ETH_ALEN];
Al Viro3e2f1a12012-04-22 07:47:50 +0100507 __be16 crc;
Simon Wunderlich23721382012-01-22 20:00:19 +0100508
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200509 memcpy(mac, batadv_announce_mac, 4);
Simon Wunderlich23721382012-01-22 20:00:19 +0100510 crc = htons(backbone_gw->crc);
Al Viro1a5852d2012-04-22 07:50:29 +0100511 memcpy(&mac[4], &crc, 2);
Simon Wunderlich23721382012-01-22 20:00:19 +0100512
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200513 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
514 CLAIM_TYPE_ANNOUNCE);
Simon Wunderlich23721382012-01-22 20:00:19 +0100515
516}
517
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200518/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100519 * @mac: the mac address of the claim
520 * @vid: the VLAN ID of the frame
521 * @backbone_gw: the backbone gateway which claims it
522 *
523 * Adds a claim in the claim hash.
524 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200525static void batadv_bla_add_claim(struct bat_priv *bat_priv, const uint8_t *mac,
526 const short vid,
527 struct backbone_gw *backbone_gw)
Simon Wunderlich23721382012-01-22 20:00:19 +0100528{
529 struct claim *claim;
530 struct claim search_claim;
531 int hash_added;
532
533 memcpy(search_claim.addr, mac, ETH_ALEN);
534 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200535 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100536
537 /* create a new claim entry if it does not exist yet. */
538 if (!claim) {
539 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
540 if (!claim)
541 return;
542
543 memcpy(claim->addr, mac, ETH_ALEN);
544 claim->vid = vid;
545 claim->lasttime = jiffies;
546 claim->backbone_gw = backbone_gw;
547
548 atomic_set(&claim->refcount, 2);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200549 batadv_dbg(DBG_BLA, bat_priv,
550 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
551 mac, vid);
Sven Eckelmannc0a55922012-05-12 13:48:55 +0200552 hash_added = batadv_hash_add(bat_priv->claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200553 batadv_compare_claim,
554 batadv_choose_claim, claim,
555 &claim->hash_entry);
Simon Wunderlich23721382012-01-22 20:00:19 +0100556
557 if (unlikely(hash_added != 0)) {
558 /* only local changes happened. */
559 kfree(claim);
560 return;
561 }
562 } else {
563 claim->lasttime = jiffies;
564 if (claim->backbone_gw == backbone_gw)
565 /* no need to register a new backbone */
566 goto claim_free_ref;
567
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200568 batadv_dbg(DBG_BLA, bat_priv,
569 "bla_add_claim(): changing ownership for %pM, vid %d\n",
570 mac, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100571
572 claim->backbone_gw->crc ^=
573 crc16(0, claim->addr, ETH_ALEN);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200574 batadv_backbone_gw_free_ref(claim->backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100575
576 }
577 /* set (new) backbone gw */
578 atomic_inc(&backbone_gw->refcount);
579 claim->backbone_gw = backbone_gw;
580
581 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
582 backbone_gw->lasttime = jiffies;
583
584claim_free_ref:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200585 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100586}
587
588/* Delete a claim from the claim hash which has the
589 * given mac address and vid.
590 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200591static void batadv_bla_del_claim(struct bat_priv *bat_priv, const uint8_t *mac,
592 const short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100593{
594 struct claim search_claim, *claim;
595
596 memcpy(search_claim.addr, mac, ETH_ALEN);
597 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200598 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100599 if (!claim)
600 return;
601
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200602 batadv_dbg(DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", mac,
603 vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100604
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200605 batadv_hash_remove(bat_priv->claim_hash, batadv_compare_claim,
606 batadv_choose_claim, claim);
607 batadv_claim_free_ref(claim); /* reference from the hash is gone */
Simon Wunderlich23721382012-01-22 20:00:19 +0100608
609 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
610
611 /* don't need the reference from hash_find() anymore */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200612 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +0100613}
614
615/* check for ANNOUNCE frame, return 1 if handled */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200616static int batadv_handle_announce(struct bat_priv *bat_priv,
617 uint8_t *an_addr, uint8_t *backbone_addr,
618 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100619{
620 struct backbone_gw *backbone_gw;
621 uint16_t crc;
622
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200623 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
Simon Wunderlich23721382012-01-22 20:00:19 +0100624 return 0;
625
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200626 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100627
628 if (unlikely(!backbone_gw))
629 return 1;
630
631
632 /* handle as ANNOUNCE frame */
633 backbone_gw->lasttime = jiffies;
Al Viro3e2f1a12012-04-22 07:47:50 +0100634 crc = ntohs(*((__be16 *)(&an_addr[4])));
Simon Wunderlich23721382012-01-22 20:00:19 +0100635
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200636 batadv_dbg(DBG_BLA, bat_priv,
637 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n",
638 vid, backbone_gw->orig, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100639
640 if (backbone_gw->crc != crc) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200641 batadv_dbg(DBG_BLA, backbone_gw->bat_priv,
642 "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n",
643 backbone_gw->orig, backbone_gw->vid,
644 backbone_gw->crc, crc);
Simon Wunderlich23721382012-01-22 20:00:19 +0100645
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200646 batadv_bla_send_request(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100647 } else {
648 /* if we have sent a request and the crc was OK,
649 * we can allow traffic again.
650 */
651 if (atomic_read(&backbone_gw->request_sent)) {
652 atomic_dec(&backbone_gw->bat_priv->bla_num_requests);
653 atomic_set(&backbone_gw->request_sent, 0);
654 }
655 }
656
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200657 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100658 return 1;
659}
660
661/* check for REQUEST frame, return 1 if handled */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200662static int batadv_handle_request(struct bat_priv *bat_priv,
663 struct hard_iface *primary_if,
664 uint8_t *backbone_addr,
665 struct ethhdr *ethhdr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100666{
667 /* check for REQUEST frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200668 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
Simon Wunderlich23721382012-01-22 20:00:19 +0100669 return 0;
670
671 /* sanity check, this should not happen on a normal switch,
672 * we ignore it in this case.
673 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200674 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +0100675 return 1;
676
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200677 batadv_dbg(DBG_BLA, bat_priv,
678 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
679 vid, ethhdr->h_source);
Simon Wunderlich23721382012-01-22 20:00:19 +0100680
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200681 batadv_bla_answer_request(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100682 return 1;
683}
684
685/* check for UNCLAIM frame, return 1 if handled */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200686static int batadv_handle_unclaim(struct bat_priv *bat_priv,
687 struct hard_iface *primary_if,
688 uint8_t *backbone_addr,
689 uint8_t *claim_addr, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100690{
691 struct backbone_gw *backbone_gw;
692
693 /* unclaim in any case if it is our own */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200694 if (primary_if && batadv_compare_eth(backbone_addr,
695 primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200696 batadv_bla_send_claim(bat_priv, claim_addr, vid,
697 CLAIM_TYPE_DEL);
Simon Wunderlich23721382012-01-22 20:00:19 +0100698
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200699 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100700
701 if (!backbone_gw)
702 return 1;
703
704 /* this must be an UNCLAIM frame */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200705 batadv_dbg(DBG_BLA, bat_priv,
706 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
707 claim_addr, vid, backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100708
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200709 batadv_bla_del_claim(bat_priv, claim_addr, vid);
710 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100711 return 1;
712}
713
714/* check for CLAIM frame, return 1 if handled */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200715static int batadv_handle_claim(struct bat_priv *bat_priv,
716 struct hard_iface *primary_if,
717 uint8_t *backbone_addr, uint8_t *claim_addr,
718 short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +0100719{
720 struct backbone_gw *backbone_gw;
721
722 /* register the gateway if not yet available, and add the claim. */
723
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200724 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100725
726 if (unlikely(!backbone_gw))
727 return 1;
728
729 /* this must be a CLAIM frame */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200730 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200731 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200732 batadv_bla_send_claim(bat_priv, claim_addr, vid,
733 CLAIM_TYPE_ADD);
Simon Wunderlich23721382012-01-22 20:00:19 +0100734
735 /* TODO: we could call something like tt_local_del() here. */
736
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200737 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100738 return 1;
739}
740
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200741/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100742 * @hw_src: the Hardware source in the ARP Header
743 * @hw_dst: the Hardware destination in the ARP Header
744 * @ethhdr: pointer to the Ethernet header of the claim frame
745 *
746 * checks if it is a claim packet and if its on the same group.
747 * This function also applies the group ID of the sender
748 * if it is in the same mesh.
749 *
750 * returns:
751 * 2 - if it is a claim packet and on the same group
752 * 1 - if is a claim packet from another group
753 * 0 - if it is not a claim packet
754 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200755static int batadv_check_claim_group(struct bat_priv *bat_priv,
756 struct hard_iface *primary_if,
757 uint8_t *hw_src, uint8_t *hw_dst,
758 struct ethhdr *ethhdr)
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100759{
760 uint8_t *backbone_addr;
761 struct orig_node *orig_node;
762 struct bla_claim_dst *bla_dst, *bla_dst_own;
763
764 bla_dst = (struct bla_claim_dst *)hw_dst;
765 bla_dst_own = &bat_priv->claim_dest;
766
767 /* check if it is a claim packet in general */
768 if (memcmp(bla_dst->magic, bla_dst_own->magic,
769 sizeof(bla_dst->magic)) != 0)
770 return 0;
771
772 /* if announcement packet, use the source,
773 * otherwise assume it is in the hw_src
774 */
775 switch (bla_dst->type) {
776 case CLAIM_TYPE_ADD:
777 backbone_addr = hw_src;
778 break;
779 case CLAIM_TYPE_REQUEST:
780 case CLAIM_TYPE_ANNOUNCE:
781 case CLAIM_TYPE_DEL:
782 backbone_addr = ethhdr->h_source;
783 break;
784 default:
785 return 0;
786 }
787
788 /* don't accept claim frames from ourselves */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200789 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100790 return 0;
791
792 /* if its already the same group, it is fine. */
793 if (bla_dst->group == bla_dst_own->group)
794 return 2;
795
796 /* lets see if this originator is in our mesh */
Sven Eckelmannda641192012-05-12 13:48:56 +0200797 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100798
799 /* dont accept claims from gateways which are not in
800 * the same mesh or group.
801 */
802 if (!orig_node)
803 return 1;
804
805 /* if our mesh friends mac is bigger, use it for ourselves. */
806 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200807 batadv_dbg(DBG_BLA, bat_priv,
808 "taking other backbones claim group: %04x\n",
809 ntohs(bla_dst->group));
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100810 bla_dst_own->group = bla_dst->group;
811 }
812
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200813 batadv_orig_node_free_ref(orig_node);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100814
815 return 2;
816}
817
818
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200819/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100820 * @skb: the frame to be checked
821 *
822 * Check if this is a claim frame, and process it accordingly.
823 *
824 * returns 1 if it was a claim frame, otherwise return 0 to
825 * tell the callee that it can use the frame on its own.
826 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200827static int batadv_bla_process_claim(struct bat_priv *bat_priv,
828 struct hard_iface *primary_if,
829 struct sk_buff *skb)
Simon Wunderlich23721382012-01-22 20:00:19 +0100830{
831 struct ethhdr *ethhdr;
832 struct vlan_ethhdr *vhdr;
833 struct arphdr *arphdr;
834 uint8_t *hw_src, *hw_dst;
835 struct bla_claim_dst *bla_dst;
836 uint16_t proto;
837 int headlen;
838 short vid = -1;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100839 int ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100840
841 ethhdr = (struct ethhdr *)skb_mac_header(skb);
842
843 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
844 vhdr = (struct vlan_ethhdr *)ethhdr;
845 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
846 proto = ntohs(vhdr->h_vlan_encapsulated_proto);
847 headlen = sizeof(*vhdr);
848 } else {
849 proto = ntohs(ethhdr->h_proto);
Antonio Quartulli0d125072012-02-18 11:27:34 +0100850 headlen = ETH_HLEN;
Simon Wunderlich23721382012-01-22 20:00:19 +0100851 }
852
853 if (proto != ETH_P_ARP)
854 return 0; /* not a claim frame */
855
856 /* this must be a ARP frame. check if it is a claim. */
857
858 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
859 return 0;
860
861 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
862 ethhdr = (struct ethhdr *)skb_mac_header(skb);
863 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
864
865 /* Check whether the ARP frame carries a valid
866 * IP information
867 */
Simon Wunderlich23721382012-01-22 20:00:19 +0100868 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
869 return 0;
870 if (arphdr->ar_pro != htons(ETH_P_IP))
871 return 0;
872 if (arphdr->ar_hln != ETH_ALEN)
873 return 0;
874 if (arphdr->ar_pln != 4)
875 return 0;
876
877 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
878 hw_dst = hw_src + ETH_ALEN + 4;
879 bla_dst = (struct bla_claim_dst *)hw_dst;
880
881 /* check if it is a claim frame. */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200882 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
883 ethhdr);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100884 if (ret == 1)
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200885 batadv_dbg(DBG_BLA, bat_priv,
886 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
887 ethhdr->h_source, vid, hw_src, hw_dst);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +0100888
889 if (ret < 2)
890 return ret;
Simon Wunderlich23721382012-01-22 20:00:19 +0100891
892 /* become a backbone gw ourselves on this vlan if not happened yet */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200893 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +0100894
895 /* check for the different types of claim frames ... */
896 switch (bla_dst->type) {
897 case CLAIM_TYPE_ADD:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200898 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
899 ethhdr->h_source, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100900 return 1;
901 break;
902 case CLAIM_TYPE_DEL:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200903 if (batadv_handle_unclaim(bat_priv, primary_if,
904 ethhdr->h_source, hw_src, vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100905 return 1;
906 break;
907
908 case CLAIM_TYPE_ANNOUNCE:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200909 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
910 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100911 return 1;
912 break;
913 case CLAIM_TYPE_REQUEST:
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200914 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
915 vid))
Simon Wunderlich23721382012-01-22 20:00:19 +0100916 return 1;
917 break;
918 }
919
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200920 batadv_dbg(DBG_BLA, bat_priv,
921 "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",
922 ethhdr->h_source, vid, hw_src, hw_dst);
Simon Wunderlich23721382012-01-22 20:00:19 +0100923 return 1;
924}
925
926/* Check when we last heard from other nodes, and remove them in case of
927 * a time out, or clean all backbone gws if now is set.
928 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200929static void batadv_bla_purge_backbone_gw(struct bat_priv *bat_priv, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100930{
931 struct backbone_gw *backbone_gw;
932 struct hlist_node *node, *node_tmp;
933 struct hlist_head *head;
934 struct hashtable_t *hash;
935 spinlock_t *list_lock; /* protects write access to the hash lists */
936 int i;
937
938 hash = bat_priv->backbone_hash;
939 if (!hash)
940 return;
941
942 for (i = 0; i < hash->size; i++) {
943 head = &hash->table[i];
944 list_lock = &hash->list_locks[i];
945
946 spin_lock_bh(list_lock);
947 hlist_for_each_entry_safe(backbone_gw, node, node_tmp,
948 head, hash_entry) {
949 if (now)
950 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200951 if (!batadv_has_timed_out(backbone_gw->lasttime,
952 BLA_BACKBONE_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +0100953 continue;
954
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200955 batadv_dbg(DBG_BLA, backbone_gw->bat_priv,
956 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
957 backbone_gw->orig);
Simon Wunderlich23721382012-01-22 20:00:19 +0100958
959purge_now:
960 /* don't wait for the pending request anymore */
961 if (atomic_read(&backbone_gw->request_sent))
962 atomic_dec(&bat_priv->bla_num_requests);
963
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200964 batadv_bla_del_backbone_claims(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100965
966 hlist_del_rcu(node);
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200967 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +0100968 }
969 spin_unlock_bh(list_lock);
970 }
971}
972
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200973/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +0100974 * @primary_if: the selected primary interface, may be NULL if now is set
975 * @now: whether the whole hash shall be wiped now
976 *
977 * Check when we heard last time from our own claims, and remove them in case of
978 * a time out, or clean all claims if now is set
979 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +0200980static void batadv_bla_purge_claims(struct bat_priv *bat_priv,
981 struct hard_iface *primary_if, int now)
Simon Wunderlich23721382012-01-22 20:00:19 +0100982{
983 struct claim *claim;
984 struct hlist_node *node;
985 struct hlist_head *head;
986 struct hashtable_t *hash;
987 int i;
988
989 hash = bat_priv->claim_hash;
990 if (!hash)
991 return;
992
993 for (i = 0; i < hash->size; i++) {
994 head = &hash->table[i];
995
996 rcu_read_lock();
997 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
998 if (now)
999 goto purge_now;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001000 if (!batadv_compare_eth(claim->backbone_gw->orig,
1001 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001002 continue;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001003 if (!batadv_has_timed_out(claim->lasttime,
1004 BLA_CLAIM_TIMEOUT))
Simon Wunderlich23721382012-01-22 20:00:19 +01001005 continue;
1006
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001007 batadv_dbg(DBG_BLA, bat_priv,
1008 "bla_purge_claims(): %pM, vid %d, time out\n",
1009 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001010
1011purge_now:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001012 batadv_handle_unclaim(bat_priv, primary_if,
1013 claim->backbone_gw->orig,
1014 claim->addr, claim->vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001015 }
1016 rcu_read_unlock();
1017 }
1018}
1019
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001020/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001021 * @primary_if: the new selected primary_if
1022 * @oldif: the old primary interface, may be NULL
1023 *
1024 * Update the backbone gateways when the own orig address changes.
Simon Wunderlich23721382012-01-22 20:00:19 +01001025 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001026void batadv_bla_update_orig_address(struct bat_priv *bat_priv,
1027 struct hard_iface *primary_if,
1028 struct hard_iface *oldif)
Simon Wunderlich23721382012-01-22 20:00:19 +01001029{
1030 struct backbone_gw *backbone_gw;
1031 struct hlist_node *node;
1032 struct hlist_head *head;
1033 struct hashtable_t *hash;
1034 int i;
1035
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001036 /* reset bridge loop avoidance group id */
1037 bat_priv->claim_dest.group =
1038 htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1039
Simon Wunderlich23721382012-01-22 20:00:19 +01001040 if (!oldif) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001041 batadv_bla_purge_claims(bat_priv, NULL, 1);
1042 batadv_bla_purge_backbone_gw(bat_priv, 1);
Simon Wunderlich23721382012-01-22 20:00:19 +01001043 return;
1044 }
1045
1046 hash = bat_priv->backbone_hash;
1047 if (!hash)
1048 return;
1049
1050 for (i = 0; i < hash->size; i++) {
1051 head = &hash->table[i];
1052
1053 rcu_read_lock();
1054 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
1055 /* own orig still holds the old value. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001056 if (!batadv_compare_eth(backbone_gw->orig,
1057 oldif->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001058 continue;
1059
1060 memcpy(backbone_gw->orig,
1061 primary_if->net_dev->dev_addr, ETH_ALEN);
1062 /* send an announce frame so others will ask for our
1063 * claims and update their tables.
1064 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001065 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001066 }
1067 rcu_read_unlock();
1068 }
1069}
1070
1071
1072
1073/* (re)start the timer */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001074static void batadv_bla_start_timer(struct bat_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001075{
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001076 INIT_DELAYED_WORK(&bat_priv->bla_work, batadv_bla_periodic_work);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +02001077 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work,
Simon Wunderlich23721382012-01-22 20:00:19 +01001078 msecs_to_jiffies(BLA_PERIOD_LENGTH));
1079}
1080
1081/* periodic work to do:
1082 * * purge structures when they are too old
1083 * * send announcements
1084 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001085static void batadv_bla_periodic_work(struct work_struct *work)
Simon Wunderlich23721382012-01-22 20:00:19 +01001086{
1087 struct delayed_work *delayed_work =
1088 container_of(work, struct delayed_work, work);
1089 struct bat_priv *bat_priv =
1090 container_of(delayed_work, struct bat_priv, bla_work);
1091 struct hlist_node *node;
1092 struct hlist_head *head;
1093 struct backbone_gw *backbone_gw;
1094 struct hashtable_t *hash;
1095 struct hard_iface *primary_if;
1096 int i;
1097
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001098 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001099 if (!primary_if)
1100 goto out;
1101
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001102 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1103 batadv_bla_purge_backbone_gw(bat_priv, 0);
Simon Wunderlich23721382012-01-22 20:00:19 +01001104
1105 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1106 goto out;
1107
1108 hash = bat_priv->backbone_hash;
1109 if (!hash)
1110 goto out;
1111
1112 for (i = 0; i < hash->size; i++) {
1113 head = &hash->table[i];
1114
1115 rcu_read_lock();
1116 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001117 if (!batadv_compare_eth(backbone_gw->orig,
1118 primary_if->net_dev->dev_addr))
Simon Wunderlich23721382012-01-22 20:00:19 +01001119 continue;
1120
1121 backbone_gw->lasttime = jiffies;
1122
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001123 batadv_bla_send_announce(bat_priv, backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001124 }
1125 rcu_read_unlock();
1126 }
1127out:
1128 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001129 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001130
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001131 batadv_bla_start_timer(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001132}
1133
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001134/* The hash for claim and backbone hash receive the same key because they
1135 * are getting initialized by hash_new with the same key. Reinitializing
1136 * them with to different keys to allow nested locking without generating
1137 * lockdep warnings
1138 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001139static struct lock_class_key batadv_claim_hash_lock_class_key;
1140static struct lock_class_key batadv_backbone_hash_lock_class_key;
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001141
Simon Wunderlich23721382012-01-22 20:00:19 +01001142/* initialize all bla structures */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001143int batadv_bla_init(struct bat_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001144{
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001145 int i;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001146 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1147 struct hard_iface *primary_if;
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001148
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001149 batadv_dbg(DBG_BLA, bat_priv, "bla hash registering\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001150
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001151 /* setting claim destination address */
1152 memcpy(&bat_priv->claim_dest.magic, claim_dest, 3);
1153 bat_priv->claim_dest.type = 0;
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001154 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001155 if (primary_if) {
1156 bat_priv->claim_dest.group =
1157 htons(crc16(0, primary_if->net_dev->dev_addr,
1158 ETH_ALEN));
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001159 batadv_hardif_free_ref(primary_if);
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001160 } else {
1161 bat_priv->claim_dest.group = 0; /* will be set later */
1162 }
1163
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001164 /* initialize the duplicate list */
1165 for (i = 0; i < DUPLIST_SIZE; i++)
1166 bat_priv->bcast_duplist[i].entrytime =
1167 jiffies - msecs_to_jiffies(DUPLIST_TIMEOUT);
1168 bat_priv->bcast_duplist_curr = 0;
1169
Simon Wunderlich23721382012-01-22 20:00:19 +01001170 if (bat_priv->claim_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001171 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001172
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001173 bat_priv->claim_hash = batadv_hash_new(128);
1174 bat_priv->backbone_hash = batadv_hash_new(32);
Simon Wunderlich23721382012-01-22 20:00:19 +01001175
1176 if (!bat_priv->claim_hash || !bat_priv->backbone_hash)
Sven Eckelmann5346c352012-05-05 13:27:28 +02001177 return -ENOMEM;
Simon Wunderlich23721382012-01-22 20:00:19 +01001178
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001179 batadv_hash_set_lock_class(bat_priv->claim_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001180 &batadv_claim_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001181 batadv_hash_set_lock_class(bat_priv->backbone_hash,
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001182 &batadv_backbone_hash_lock_class_key);
Sven Eckelmann5d52dad2012-03-29 12:38:20 +02001183
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001184 batadv_dbg(DBG_BLA, bat_priv, "bla hashes initialized\n");
Simon Wunderlich23721382012-01-22 20:00:19 +01001185
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001186 batadv_bla_start_timer(bat_priv);
Sven Eckelmann5346c352012-05-05 13:27:28 +02001187 return 0;
Simon Wunderlich23721382012-01-22 20:00:19 +01001188}
1189
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001190/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001191 * @bcast_packet: originator mac address
1192 * @hdr_size: maximum length of the frame
1193 *
1194 * check if it is on our broadcast list. Another gateway might
1195 * have sent the same packet because it is connected to the same backbone,
1196 * so we have to remove this duplicate.
1197 *
1198 * This is performed by checking the CRC, which will tell us
1199 * with a good chance that it is the same packet. If it is furthermore
1200 * sent by another host, drop it. We allow equal packets from
1201 * the same host however as this might be intended.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001202 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001203int batadv_bla_check_bcast_duplist(struct bat_priv *bat_priv,
1204 struct bcast_packet *bcast_packet,
1205 int hdr_size)
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001206{
1207 int i, length, curr;
1208 uint8_t *content;
1209 uint16_t crc;
1210 struct bcast_duplist_entry *entry;
1211
1212 length = hdr_size - sizeof(*bcast_packet);
1213 content = (uint8_t *)bcast_packet;
1214 content += sizeof(*bcast_packet);
1215
1216 /* calculate the crc ... */
1217 crc = crc16(0, content, length);
1218
1219 for (i = 0 ; i < DUPLIST_SIZE; i++) {
1220 curr = (bat_priv->bcast_duplist_curr + i) % DUPLIST_SIZE;
1221 entry = &bat_priv->bcast_duplist[curr];
1222
1223 /* we can stop searching if the entry is too old ;
1224 * later entries will be even older
1225 */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001226 if (batadv_has_timed_out(entry->entrytime, DUPLIST_TIMEOUT))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001227 break;
1228
1229 if (entry->crc != crc)
1230 continue;
1231
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001232 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
Simon Wunderlichfe2da6f2012-01-22 20:00:24 +01001233 continue;
1234
1235 /* this entry seems to match: same crc, not too old,
1236 * and from another gw. therefore return 1 to forbid it.
1237 */
1238 return 1;
1239 }
1240 /* not found, add a new entry (overwrite the oldest entry) */
1241 curr = (bat_priv->bcast_duplist_curr + DUPLIST_SIZE - 1) % DUPLIST_SIZE;
1242 entry = &bat_priv->bcast_duplist[curr];
1243 entry->crc = crc;
1244 entry->entrytime = jiffies;
1245 memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
1246 bat_priv->bcast_duplist_curr = curr;
1247
1248 /* allow it, its the first occurence. */
1249 return 0;
1250}
1251
1252
1253
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001254/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001255 * @orig: originator mac address
1256 *
1257 * check if the originator is a gateway for any VLAN ID.
1258 *
1259 * returns 1 if it is found, 0 otherwise
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001260 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001261int batadv_bla_is_backbone_gw_orig(struct bat_priv *bat_priv, uint8_t *orig)
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001262{
1263 struct hashtable_t *hash = bat_priv->backbone_hash;
1264 struct hlist_head *head;
1265 struct hlist_node *node;
1266 struct backbone_gw *backbone_gw;
1267 int i;
1268
1269 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1270 return 0;
1271
1272 if (!hash)
1273 return 0;
1274
1275 for (i = 0; i < hash->size; i++) {
1276 head = &hash->table[i];
1277
1278 rcu_read_lock();
1279 hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001280 if (batadv_compare_eth(backbone_gw->orig, orig)) {
Simon Wunderlich20ff9d52012-01-22 20:00:23 +01001281 rcu_read_unlock();
1282 return 1;
1283 }
1284 }
1285 rcu_read_unlock();
1286 }
1287
1288 return 0;
1289}
1290
1291
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001292/* @skb: the frame to be checked
Simon Wunderlich23721382012-01-22 20:00:19 +01001293 * @orig_node: the orig_node of the frame
1294 * @hdr_size: maximum length of the frame
1295 *
1296 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1297 * if the orig_node is also a gateway on the soft interface, otherwise it
1298 * returns 0.
Simon Wunderlich23721382012-01-22 20:00:19 +01001299 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001300int batadv_bla_is_backbone_gw(struct sk_buff *skb,
1301 struct orig_node *orig_node, int hdr_size)
Simon Wunderlich23721382012-01-22 20:00:19 +01001302{
1303 struct ethhdr *ethhdr;
1304 struct vlan_ethhdr *vhdr;
1305 struct backbone_gw *backbone_gw;
1306 short vid = -1;
1307
1308 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1309 return 0;
1310
1311 /* first, find out the vid. */
Antonio Quartulli0d125072012-02-18 11:27:34 +01001312 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
Simon Wunderlich23721382012-01-22 20:00:19 +01001313 return 0;
1314
1315 ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
1316
1317 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
1318 if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
1319 return 0;
1320
1321 vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) +
1322 hdr_size);
1323 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
1324 }
1325
1326 /* see if this originator is a backbone gw for this VLAN */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001327 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1328 orig_node->orig, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001329 if (!backbone_gw)
1330 return 0;
1331
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001332 batadv_backbone_gw_free_ref(backbone_gw);
Simon Wunderlich23721382012-01-22 20:00:19 +01001333 return 1;
1334}
1335
1336/* free all bla structures (for softinterface free or module unload) */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001337void batadv_bla_free(struct bat_priv *bat_priv)
Simon Wunderlich23721382012-01-22 20:00:19 +01001338{
1339 struct hard_iface *primary_if;
1340
1341 cancel_delayed_work_sync(&bat_priv->bla_work);
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001342 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001343
1344 if (bat_priv->claim_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001345 batadv_bla_purge_claims(bat_priv, primary_if, 1);
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001346 batadv_hash_destroy(bat_priv->claim_hash);
Simon Wunderlich23721382012-01-22 20:00:19 +01001347 bat_priv->claim_hash = NULL;
1348 }
1349 if (bat_priv->backbone_hash) {
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001350 batadv_bla_purge_backbone_gw(bat_priv, 1);
Sven Eckelmann1a8eaf02012-05-12 02:09:32 +02001351 batadv_hash_destroy(bat_priv->backbone_hash);
Simon Wunderlich23721382012-01-22 20:00:19 +01001352 bat_priv->backbone_hash = NULL;
1353 }
1354 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001355 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001356}
1357
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001358/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001359 * @skb: the frame to be checked
1360 * @vid: the VLAN ID of the frame
1361 *
1362 * bla_rx avoidance checks if:
1363 * * we have to race for a claim
1364 * * if the frame is allowed on the LAN
1365 *
1366 * in these cases, the skb is further handled by this function and
1367 * returns 1, otherwise it returns 0 and the caller shall further
1368 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001369 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001370int batadv_bla_rx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001371{
1372 struct ethhdr *ethhdr;
1373 struct claim search_claim, *claim = NULL;
1374 struct hard_iface *primary_if;
1375 int ret;
1376
1377 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1378
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001379 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001380 if (!primary_if)
1381 goto handled;
1382
1383 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1384 goto allow;
1385
1386
1387 if (unlikely(atomic_read(&bat_priv->bla_num_requests)))
1388 /* don't allow broadcasts while requests are in flight */
1389 if (is_multicast_ether_addr(ethhdr->h_dest))
1390 goto handled;
1391
1392 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1393 search_claim.vid = vid;
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001394 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001395
1396 if (!claim) {
1397 /* possible optimization: race for a claim */
1398 /* No claim exists yet, claim it for us!
1399 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001400 batadv_handle_claim(bat_priv, primary_if,
1401 primary_if->net_dev->dev_addr,
1402 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001403 goto allow;
1404 }
1405
1406 /* if it is our own claim ... */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001407 if (batadv_compare_eth(claim->backbone_gw->orig,
1408 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001409 /* ... allow it in any case */
1410 claim->lasttime = jiffies;
1411 goto allow;
1412 }
1413
1414 /* if it is a broadcast ... */
1415 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1416 /* ... drop it. the responsible gateway is in charge. */
1417 goto handled;
1418 } else {
1419 /* seems the client considers us as its best gateway.
1420 * send a claim and update the claim table
1421 * immediately.
1422 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001423 batadv_handle_claim(bat_priv, primary_if,
1424 primary_if->net_dev->dev_addr,
1425 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001426 goto allow;
1427 }
1428allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001429 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001430 ret = 0;
1431 goto out;
1432
1433handled:
1434 kfree_skb(skb);
1435 ret = 1;
1436
1437out:
1438 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001439 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001440 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001441 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001442 return ret;
1443}
1444
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001445/* @bat_priv: the bat priv with all the soft interface information
Simon Wunderlich23721382012-01-22 20:00:19 +01001446 * @skb: the frame to be checked
1447 * @vid: the VLAN ID of the frame
1448 *
1449 * bla_tx checks if:
1450 * * a claim was received which has to be processed
1451 * * the frame is allowed on the mesh
1452 *
1453 * in these cases, the skb is further handled by this function and
1454 * returns 1, otherwise it returns 0 and the caller shall further
1455 * process the skb.
Simon Wunderlich23721382012-01-22 20:00:19 +01001456 */
Sven Eckelmann08adf152012-05-12 13:38:47 +02001457int batadv_bla_tx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid)
Simon Wunderlich23721382012-01-22 20:00:19 +01001458{
1459 struct ethhdr *ethhdr;
1460 struct claim search_claim, *claim = NULL;
1461 struct hard_iface *primary_if;
1462 int ret = 0;
1463
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001464 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich23721382012-01-22 20:00:19 +01001465 if (!primary_if)
1466 goto out;
1467
1468 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1469 goto allow;
1470
1471 /* in VLAN case, the mac header might not be set. */
1472 skb_reset_mac_header(skb);
1473
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001474 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
Simon Wunderlich23721382012-01-22 20:00:19 +01001475 goto handled;
1476
1477 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1478
1479 if (unlikely(atomic_read(&bat_priv->bla_num_requests)))
1480 /* don't allow broadcasts while requests are in flight */
1481 if (is_multicast_ether_addr(ethhdr->h_dest))
1482 goto handled;
1483
1484 memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
1485 search_claim.vid = vid;
1486
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001487 claim = batadv_claim_hash_find(bat_priv, &search_claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001488
1489 /* if no claim exists, allow it. */
1490 if (!claim)
1491 goto allow;
1492
1493 /* check if we are responsible. */
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001494 if (batadv_compare_eth(claim->backbone_gw->orig,
1495 primary_if->net_dev->dev_addr)) {
Simon Wunderlich23721382012-01-22 20:00:19 +01001496 /* if yes, the client has roamed and we have
1497 * to unclaim it.
1498 */
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001499 batadv_handle_unclaim(bat_priv, primary_if,
1500 primary_if->net_dev->dev_addr,
1501 ethhdr->h_source, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001502 goto allow;
1503 }
1504
1505 /* check if it is a multicast/broadcast frame */
1506 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1507 /* drop it. the responsible gateway has forwarded it into
1508 * the backbone network.
1509 */
1510 goto handled;
1511 } else {
1512 /* we must allow it. at least if we are
1513 * responsible for the DESTINATION.
1514 */
1515 goto allow;
1516 }
1517allow:
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001518 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
Simon Wunderlich23721382012-01-22 20:00:19 +01001519 ret = 0;
1520 goto out;
1521handled:
1522 ret = 1;
1523out:
1524 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001525 batadv_hardif_free_ref(primary_if);
Simon Wunderlich23721382012-01-22 20:00:19 +01001526 if (claim)
Sven Eckelmann3b300de2012-05-12 18:33:53 +02001527 batadv_claim_free_ref(claim);
Simon Wunderlich23721382012-01-22 20:00:19 +01001528 return ret;
1529}
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001530
Sven Eckelmann08adf152012-05-12 13:38:47 +02001531int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001532{
1533 struct net_device *net_dev = (struct net_device *)seq->private;
1534 struct bat_priv *bat_priv = netdev_priv(net_dev);
1535 struct hashtable_t *hash = bat_priv->claim_hash;
1536 struct claim *claim;
1537 struct hard_iface *primary_if;
1538 struct hlist_node *node;
1539 struct hlist_head *head;
1540 uint32_t i;
1541 bool is_own;
1542 int ret = 0;
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001543 uint8_t *primary_addr;
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001544
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001545 primary_if = batadv_primary_if_get_selected(bat_priv);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001546 if (!primary_if) {
1547 ret = seq_printf(seq,
1548 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1549 net_dev->name);
1550 goto out;
1551 }
1552
1553 if (primary_if->if_status != IF_ACTIVE) {
1554 ret = seq_printf(seq,
1555 "BATMAN mesh %s disabled - primary interface not active\n",
1556 net_dev->name);
1557 goto out;
1558 }
1559
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001560 primary_addr = primary_if->net_dev->dev_addr;
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001561 seq_printf(seq,
1562 "Claims announced for the mesh %s (orig %pM, group id %04x)\n",
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001563 net_dev->name, primary_addr,
Simon Wunderlich38ef3d12012-01-22 20:00:26 +01001564 ntohs(bat_priv->claim_dest.group));
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001565 seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n",
1566 "Client", "VID", "Originator", "CRC");
1567 for (i = 0; i < hash->size; i++) {
1568 head = &hash->table[i];
1569
1570 rcu_read_lock();
1571 hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
Sven Eckelmann1eda58b2012-05-12 13:48:58 +02001572 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1573 primary_addr);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001574 seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n",
1575 claim->addr, claim->vid,
1576 claim->backbone_gw->orig,
1577 (is_own ? 'x' : ' '),
1578 claim->backbone_gw->crc);
1579 }
1580 rcu_read_unlock();
1581 }
1582out:
1583 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +02001584 batadv_hardif_free_ref(primary_if);
Simon Wunderlich9bf8e4d2012-01-22 20:00:21 +01001585 return ret;
1586}