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0046b040 | 1 | /* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: |
23721387 SW |
2 | * |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
23721387 SW |
16 | */ |
17 | ||
23721387 | 18 | #include "bridge_loop_avoidance.h" |
1e2c2a4f | 19 | #include "main.h" |
23721387 | 20 | |
1e2c2a4f SE |
21 | #include <linux/atomic.h> |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
23721387 | 24 | #include <linux/crc16.h> |
1e2c2a4f SE |
25 | #include <linux/errno.h> |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/fs.h> | |
23721387 | 28 | #include <linux/if_arp.h> |
1e2c2a4f | 29 | #include <linux/if_ether.h> |
23721387 | 30 | #include <linux/if_vlan.h> |
1e2c2a4f SE |
31 | #include <linux/jhash.h> |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/kernel.h> | |
06e56ded | 34 | #include <linux/kref.h> |
1e2c2a4f SE |
35 | #include <linux/list.h> |
36 | #include <linux/lockdep.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/rculist.h> | |
39 | #include <linux/rcupdate.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/skbuff.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/spinlock.h> | |
44 | #include <linux/stddef.h> | |
45 | #include <linux/string.h> | |
46 | #include <linux/workqueue.h> | |
47 | #include <net/arp.h> | |
48 | ||
49 | #include "hard-interface.h" | |
50 | #include "hash.h" | |
51 | #include "originator.h" | |
52 | #include "packet.h" | |
53 | #include "translation-table.h" | |
23721387 | 54 | |
6b5e971a | 55 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
23721387 | 56 | |
3b300de3 | 57 | static void batadv_bla_periodic_work(struct work_struct *work); |
bae98774 ML |
58 | static void |
59 | batadv_bla_send_announce(struct batadv_priv *bat_priv, | |
60 | struct batadv_bla_backbone_gw *backbone_gw); | |
23721387 | 61 | |
62fe710f | 62 | /** |
04e14be6 SW |
63 | * batadv_choose_claim - choose the right bucket for a claim. |
64 | * @data: data to hash | |
65 | * @size: size of the hash table | |
62fe710f | 66 | * |
04e14be6 | 67 | * Return: the hash index of the claim |
62fe710f | 68 | */ |
6b5e971a | 69 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
23721387 | 70 | { |
712bbfe4 | 71 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 72 | u32 hash = 0; |
23721387 | 73 | |
36fd61cb SE |
74 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
75 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
76 | |
77 | return hash % size; | |
78 | } | |
79 | ||
62fe710f | 80 | /** |
04e14be6 SW |
81 | * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway. |
82 | * @data: data to hash | |
83 | * @size: size of the hash table | |
62fe710f | 84 | * |
04e14be6 | 85 | * Return: the hash index of the backbone gateway |
62fe710f | 86 | */ |
6b5e971a | 87 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
23721387 | 88 | { |
712bbfe4 | 89 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
6b5e971a | 90 | u32 hash = 0; |
23721387 | 91 | |
36fd61cb SE |
92 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
93 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); | |
23721387 SW |
94 | |
95 | return hash % size; | |
96 | } | |
97 | ||
04e14be6 SW |
98 | /** |
99 | * batadv_compare_backbone_gw - compare address and vid of two backbone gws | |
100 | * @node: list node of the first entry to compare | |
101 | * @data2: pointer to the second backbone gateway | |
102 | * | |
103 | * Return: 1 if the backbones have the same data, 0 otherwise | |
104 | */ | |
3b300de3 SE |
105 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
106 | const void *data2) | |
23721387 | 107 | { |
bae98774 | 108 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
23721387 | 109 | hash_entry); |
4f248cff SE |
110 | const struct batadv_bla_backbone_gw *gw1 = data1; |
111 | const struct batadv_bla_backbone_gw *gw2 = data2; | |
23721387 | 112 | |
c76d1525 SW |
113 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
114 | return 0; | |
115 | ||
116 | if (gw1->vid != gw2->vid) | |
117 | return 0; | |
118 | ||
119 | return 1; | |
23721387 SW |
120 | } |
121 | ||
04e14be6 SW |
122 | /** |
123 | * batadv_compare_backbone_gw - compare address and vid of two claims | |
124 | * @node: list node of the first entry to compare | |
125 | * @data2: pointer to the second claims | |
126 | * | |
127 | * Return: 1 if the claim have the same data, 0 otherwise | |
128 | */ | |
3b300de3 SE |
129 | static int batadv_compare_claim(const struct hlist_node *node, |
130 | const void *data2) | |
23721387 | 131 | { |
712bbfe4 | 132 | const void *data1 = container_of(node, struct batadv_bla_claim, |
23721387 | 133 | hash_entry); |
4f248cff SE |
134 | const struct batadv_bla_claim *cl1 = data1; |
135 | const struct batadv_bla_claim *cl2 = data2; | |
c76d1525 SW |
136 | |
137 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) | |
138 | return 0; | |
139 | ||
140 | if (cl1->vid != cl2->vid) | |
141 | return 0; | |
23721387 | 142 | |
c76d1525 | 143 | return 1; |
23721387 SW |
144 | } |
145 | ||
04e14be6 | 146 | /** |
06e56ded SE |
147 | * batadv_backbone_gw_release - release backbone gw from lists and queue for |
148 | * free after rcu grace period | |
149 | * @ref: kref pointer of the backbone gw | |
150 | */ | |
151 | static void batadv_backbone_gw_release(struct kref *ref) | |
152 | { | |
153 | struct batadv_bla_backbone_gw *backbone_gw; | |
154 | ||
155 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, | |
156 | refcount); | |
157 | ||
158 | kfree_rcu(backbone_gw, rcu); | |
159 | } | |
160 | ||
161 | /** | |
162 | * batadv_backbone_gw_free_ref - decrement the backbone gw refcounter and | |
163 | * possibly release it | |
04e14be6 SW |
164 | * @backbone_gw: backbone gateway to be free'd |
165 | */ | |
bae98774 ML |
166 | static void |
167 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) | |
23721387 | 168 | { |
06e56ded | 169 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
23721387 SW |
170 | } |
171 | ||
04e14be6 SW |
172 | /** |
173 | * batadv_claim_release - release claim from lists and queue for free after rcu | |
174 | * grace period | |
175 | * @ref: kref pointer of the claim | |
176 | */ | |
71b7e3d3 | 177 | static void batadv_claim_release(struct kref *ref) |
23721387 | 178 | { |
71b7e3d3 SE |
179 | struct batadv_bla_claim *claim; |
180 | ||
181 | claim = container_of(ref, struct batadv_bla_claim, refcount); | |
182 | ||
3b300de3 | 183 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
63b39927 | 184 | kfree_rcu(claim, rcu); |
23721387 SW |
185 | } |
186 | ||
04e14be6 | 187 | /** |
ec9b83ca SE |
188 | * batadv_claim_free_ref - decrement the claim refcounter and possibly |
189 | * release it | |
04e14be6 SW |
190 | * @claim: claim to be free'd |
191 | */ | |
712bbfe4 | 192 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
23721387 | 193 | { |
71b7e3d3 | 194 | kref_put(&claim->refcount, batadv_claim_release); |
23721387 SW |
195 | } |
196 | ||
1b371d13 | 197 | /** |
04e14be6 | 198 | * batadv_claim_hash_find - looks for a claim in the claim hash |
1b371d13 | 199 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
200 | * @data: search data (may be local/static data) |
201 | * | |
62fe710f | 202 | * Return: claim if found or NULL otherwise. |
23721387 | 203 | */ |
712bbfe4 ML |
204 | static struct batadv_bla_claim |
205 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, | |
206 | struct batadv_bla_claim *data) | |
23721387 | 207 | { |
807736f6 | 208 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
23721387 | 209 | struct hlist_head *head; |
712bbfe4 ML |
210 | struct batadv_bla_claim *claim; |
211 | struct batadv_bla_claim *claim_tmp = NULL; | |
23721387 SW |
212 | int index; |
213 | ||
214 | if (!hash) | |
215 | return NULL; | |
216 | ||
3b300de3 | 217 | index = batadv_choose_claim(data, hash->size); |
23721387 SW |
218 | head = &hash->table[index]; |
219 | ||
220 | rcu_read_lock(); | |
b67bfe0d | 221 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
3b300de3 | 222 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
23721387 SW |
223 | continue; |
224 | ||
71b7e3d3 | 225 | if (!kref_get_unless_zero(&claim->refcount)) |
23721387 SW |
226 | continue; |
227 | ||
228 | claim_tmp = claim; | |
229 | break; | |
230 | } | |
231 | rcu_read_unlock(); | |
232 | ||
233 | return claim_tmp; | |
234 | } | |
235 | ||
2c53040f | 236 | /** |
04e14be6 | 237 | * batadv_backbone_hash_find - looks for a backbone gateway in the hash |
2c53040f | 238 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
239 | * @addr: the address of the originator |
240 | * @vid: the VLAN ID | |
241 | * | |
04e14be6 | 242 | * Return: backbone gateway if found or NULL otherwise |
23721387 | 243 | */ |
bae98774 | 244 | static struct batadv_bla_backbone_gw * |
6b5e971a SE |
245 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
246 | unsigned short vid) | |
23721387 | 247 | { |
807736f6 | 248 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
23721387 | 249 | struct hlist_head *head; |
bae98774 ML |
250 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
251 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; | |
23721387 SW |
252 | int index; |
253 | ||
254 | if (!hash) | |
255 | return NULL; | |
256 | ||
8fdd0153 | 257 | ether_addr_copy(search_entry.orig, addr); |
23721387 SW |
258 | search_entry.vid = vid; |
259 | ||
3b300de3 | 260 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
23721387 SW |
261 | head = &hash->table[index]; |
262 | ||
263 | rcu_read_lock(); | |
b67bfe0d | 264 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
3b300de3 SE |
265 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
266 | &search_entry)) | |
23721387 SW |
267 | continue; |
268 | ||
06e56ded | 269 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
23721387 SW |
270 | continue; |
271 | ||
272 | backbone_gw_tmp = backbone_gw; | |
273 | break; | |
274 | } | |
275 | rcu_read_unlock(); | |
276 | ||
277 | return backbone_gw_tmp; | |
278 | } | |
279 | ||
04e14be6 SW |
280 | /** |
281 | * batadv_bla_del_backbone_claims - delete all claims for a backbone | |
282 | * @backbone_gw: backbone gateway where the claims should be removed | |
283 | */ | |
56303d34 | 284 | static void |
bae98774 | 285 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 286 | { |
5bf74e9c | 287 | struct batadv_hashtable *hash; |
b67bfe0d | 288 | struct hlist_node *node_tmp; |
23721387 | 289 | struct hlist_head *head; |
712bbfe4 | 290 | struct batadv_bla_claim *claim; |
23721387 SW |
291 | int i; |
292 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
293 | ||
807736f6 | 294 | hash = backbone_gw->bat_priv->bla.claim_hash; |
23721387 SW |
295 | if (!hash) |
296 | return; | |
297 | ||
298 | for (i = 0; i < hash->size; i++) { | |
299 | head = &hash->table[i]; | |
300 | list_lock = &hash->list_locks[i]; | |
301 | ||
302 | spin_lock_bh(list_lock); | |
b67bfe0d | 303 | hlist_for_each_entry_safe(claim, node_tmp, |
23721387 | 304 | head, hash_entry) { |
23721387 SW |
305 | if (claim->backbone_gw != backbone_gw) |
306 | continue; | |
307 | ||
3b300de3 | 308 | batadv_claim_free_ref(claim); |
b67bfe0d | 309 | hlist_del_rcu(&claim->hash_entry); |
23721387 SW |
310 | } |
311 | spin_unlock_bh(list_lock); | |
312 | } | |
313 | ||
3f68785e | 314 | /* all claims gone, initialize CRC */ |
5a1dd8a4 | 315 | spin_lock_bh(&backbone_gw->crc_lock); |
3964f728 | 316 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
5a1dd8a4 | 317 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
318 | } |
319 | ||
2c53040f BH |
320 | /** |
321 | * batadv_bla_send_claim - sends a claim frame according to the provided info | |
322 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 323 | * @mac: the mac address to be announced within the claim |
23721387 SW |
324 | * @vid: the VLAN ID |
325 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
23721387 | 326 | */ |
6b5e971a | 327 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
eb2deb6b | 328 | unsigned short vid, int claimtype) |
23721387 SW |
329 | { |
330 | struct sk_buff *skb; | |
331 | struct ethhdr *ethhdr; | |
56303d34 | 332 | struct batadv_hard_iface *primary_if; |
23721387 | 333 | struct net_device *soft_iface; |
6b5e971a | 334 | u8 *hw_src; |
96412690 | 335 | struct batadv_bla_claim_dst local_claim_dest; |
3e2f1a1b | 336 | __be32 zeroip = 0; |
23721387 | 337 | |
e5d89254 | 338 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
339 | if (!primary_if) |
340 | return; | |
341 | ||
807736f6 | 342 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
38ef3d1d | 343 | sizeof(local_claim_dest)); |
23721387 SW |
344 | local_claim_dest.type = claimtype; |
345 | ||
346 | soft_iface = primary_if->soft_iface; | |
347 | ||
348 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
349 | /* IP DST: 0.0.0.0 */ | |
350 | zeroip, | |
351 | primary_if->soft_iface, | |
352 | /* IP SRC: 0.0.0.0 */ | |
353 | zeroip, | |
354 | /* Ethernet DST: Broadcast */ | |
355 | NULL, | |
356 | /* Ethernet SRC/HW SRC: originator mac */ | |
357 | primary_if->net_dev->dev_addr, | |
99e966fc | 358 | /* HW DST: FF:43:05:XX:YY:YY |
23721387 | 359 | * with XX = claim type |
38ef3d1d | 360 | * and YY:YY = group id |
23721387 | 361 | */ |
6b5e971a | 362 | (u8 *)&local_claim_dest); |
23721387 SW |
363 | |
364 | if (!skb) | |
365 | goto out; | |
366 | ||
367 | ethhdr = (struct ethhdr *)skb->data; | |
6b5e971a | 368 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
369 | |
370 | /* now we pretend that the client would have sent this ... */ | |
371 | switch (claimtype) { | |
3eb8773e | 372 | case BATADV_CLAIM_TYPE_CLAIM: |
23721387 SW |
373 | /* normal claim frame |
374 | * set Ethernet SRC to the clients mac | |
375 | */ | |
8fdd0153 | 376 | ether_addr_copy(ethhdr->h_source, mac); |
39c75a51 | 377 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
5f80df67 AQ |
378 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
379 | BATADV_PRINT_VID(vid)); | |
23721387 | 380 | break; |
3eb8773e | 381 | case BATADV_CLAIM_TYPE_UNCLAIM: |
23721387 SW |
382 | /* unclaim frame |
383 | * set HW SRC to the clients mac | |
384 | */ | |
8fdd0153 | 385 | ether_addr_copy(hw_src, mac); |
39c75a51 | 386 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 387 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
5f80df67 | 388 | BATADV_PRINT_VID(vid)); |
23721387 | 389 | break; |
acd34afa | 390 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
23721387 SW |
391 | /* announcement frame |
392 | * set HW SRC to the special mac containg the crc | |
393 | */ | |
8fdd0153 | 394 | ether_addr_copy(hw_src, mac); |
39c75a51 | 395 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 396 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
5f80df67 | 397 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
23721387 | 398 | break; |
acd34afa | 399 | case BATADV_CLAIM_TYPE_REQUEST: |
23721387 | 400 | /* request frame |
99e966fc SW |
401 | * set HW SRC and header destination to the receiving backbone |
402 | * gws mac | |
23721387 | 403 | */ |
8fdd0153 AQ |
404 | ether_addr_copy(hw_src, mac); |
405 | ether_addr_copy(ethhdr->h_dest, mac); | |
39c75a51 | 406 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
eb2deb6b | 407 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
5f80df67 AQ |
408 | ethhdr->h_source, ethhdr->h_dest, |
409 | BATADV_PRINT_VID(vid)); | |
23721387 | 410 | break; |
23721387 SW |
411 | } |
412 | ||
eb2deb6b AQ |
413 | if (vid & BATADV_VLAN_HAS_TAG) |
414 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), | |
415 | vid & VLAN_VID_MASK); | |
23721387 SW |
416 | |
417 | skb_reset_mac_header(skb); | |
418 | skb->protocol = eth_type_trans(skb, soft_iface); | |
1c9b0550 ML |
419 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
420 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, | |
421 | skb->len + ETH_HLEN); | |
23721387 SW |
422 | soft_iface->last_rx = jiffies; |
423 | ||
424 | netif_rx(skb); | |
425 | out: | |
426 | if (primary_if) | |
e5d89254 | 427 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
428 | } |
429 | ||
2c53040f | 430 | /** |
04e14be6 | 431 | * batadv_bla_get_backbone_gw - finds or creates a backbone gateway |
2c53040f | 432 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
433 | * @orig: the mac address of the originator |
434 | * @vid: the VLAN ID | |
e3357189 | 435 | * @own_backbone: set if the requested backbone is local |
23721387 | 436 | * |
04e14be6 | 437 | * Return: the (possibly created) backbone gateway or NULL on error |
23721387 | 438 | */ |
bae98774 | 439 | static struct batadv_bla_backbone_gw * |
6b5e971a | 440 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
eb2deb6b | 441 | unsigned short vid, bool own_backbone) |
23721387 | 442 | { |
bae98774 | 443 | struct batadv_bla_backbone_gw *entry; |
56303d34 | 444 | struct batadv_orig_node *orig_node; |
23721387 SW |
445 | int hash_added; |
446 | ||
3b300de3 | 447 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
23721387 SW |
448 | |
449 | if (entry) | |
450 | return entry; | |
451 | ||
39c75a51 | 452 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 453 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
5f80df67 | 454 | orig, BATADV_PRINT_VID(vid)); |
23721387 SW |
455 | |
456 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
457 | if (!entry) | |
458 | return NULL; | |
459 | ||
460 | entry->vid = vid; | |
461 | entry->lasttime = jiffies; | |
3964f728 | 462 | entry->crc = BATADV_BLA_CRC_INIT; |
23721387 | 463 | entry->bat_priv = bat_priv; |
5a1dd8a4 | 464 | spin_lock_init(&entry->crc_lock); |
23721387 | 465 | atomic_set(&entry->request_sent, 0); |
28709878 | 466 | atomic_set(&entry->wait_periods, 0); |
8fdd0153 | 467 | ether_addr_copy(entry->orig, orig); |
23721387 SW |
468 | |
469 | /* one for the hash, one for returning */ | |
06e56ded SE |
470 | kref_init(&entry->refcount); |
471 | kref_get(&entry->refcount); | |
23721387 | 472 | |
807736f6 | 473 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
3b300de3 SE |
474 | batadv_compare_backbone_gw, |
475 | batadv_choose_backbone_gw, entry, | |
476 | &entry->hash_entry); | |
23721387 SW |
477 | |
478 | if (unlikely(hash_added != 0)) { | |
479 | /* hash failed, free the structure */ | |
480 | kfree(entry); | |
481 | return NULL; | |
482 | } | |
483 | ||
95fb130d | 484 | /* this is a gateway now, remove any TT entry on this VLAN */ |
da641193 | 485 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
20ff9d59 | 486 | if (orig_node) { |
95fb130d | 487 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
08c36d3e | 488 | "became a backbone gateway"); |
5d967310 | 489 | batadv_orig_node_put(orig_node); |
20ff9d59 | 490 | } |
52aebd6a | 491 | |
d807f272 | 492 | if (own_backbone) { |
52aebd6a SW |
493 | batadv_bla_send_announce(bat_priv, entry); |
494 | ||
d807f272 SW |
495 | /* this will be decreased in the worker thread */ |
496 | atomic_inc(&entry->request_sent); | |
28709878 | 497 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
d807f272 SW |
498 | atomic_inc(&bat_priv->bla.num_requests); |
499 | } | |
500 | ||
23721387 SW |
501 | return entry; |
502 | } | |
503 | ||
04e14be6 SW |
504 | /** |
505 | * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN | |
506 | * @bat_priv: the bat priv with all the soft interface information | |
507 | * @primary_if: the selected primary interface | |
508 | * @vid: VLAN identifier | |
509 | * | |
510 | * update or add the own backbone gw to make sure we announce | |
23721387 SW |
511 | * where we receive other backbone gws |
512 | */ | |
56303d34 SE |
513 | static void |
514 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, | |
515 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 516 | unsigned short vid) |
23721387 | 517 | { |
bae98774 | 518 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 519 | |
3b300de3 SE |
520 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
521 | primary_if->net_dev->dev_addr, | |
52aebd6a | 522 | vid, true); |
23721387 SW |
523 | if (unlikely(!backbone_gw)) |
524 | return; | |
525 | ||
526 | backbone_gw->lasttime = jiffies; | |
3b300de3 | 527 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
528 | } |
529 | ||
1b371d13 SW |
530 | /** |
531 | * batadv_bla_answer_request - answer a bla request by sending own claims | |
532 | * @bat_priv: the bat priv with all the soft interface information | |
e3357189 | 533 | * @primary_if: interface where the request came on |
23721387 SW |
534 | * @vid: the vid where the request came on |
535 | * | |
536 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
537 | * to allow the requester another check if the CRC is correct now. | |
538 | */ | |
56303d34 SE |
539 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
540 | struct batadv_hard_iface *primary_if, | |
eb2deb6b | 541 | unsigned short vid) |
23721387 | 542 | { |
23721387 | 543 | struct hlist_head *head; |
5bf74e9c | 544 | struct batadv_hashtable *hash; |
712bbfe4 | 545 | struct batadv_bla_claim *claim; |
bae98774 | 546 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
547 | int i; |
548 | ||
39c75a51 | 549 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 550 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
23721387 | 551 | |
3b300de3 SE |
552 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
553 | primary_if->net_dev->dev_addr, | |
554 | vid); | |
23721387 SW |
555 | if (!backbone_gw) |
556 | return; | |
557 | ||
807736f6 | 558 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
559 | for (i = 0; i < hash->size; i++) { |
560 | head = &hash->table[i]; | |
561 | ||
562 | rcu_read_lock(); | |
b67bfe0d | 563 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
564 | /* only own claims are interesting */ |
565 | if (claim->backbone_gw != backbone_gw) | |
566 | continue; | |
567 | ||
3b300de3 | 568 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
3eb8773e | 569 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
570 | } |
571 | rcu_read_unlock(); | |
572 | } | |
573 | ||
574 | /* finally, send an announcement frame */ | |
3b300de3 SE |
575 | batadv_bla_send_announce(bat_priv, backbone_gw); |
576 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
577 | } |
578 | ||
1b371d13 SW |
579 | /** |
580 | * batadv_bla_send_request - send a request to repeat claims | |
581 | * @backbone_gw: the backbone gateway from whom we are out of sync | |
23721387 SW |
582 | * |
583 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
584 | * After the request, it will repeat all of his own claims and finally | |
585 | * send an announcement claim with which we can check again. | |
586 | */ | |
bae98774 | 587 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
23721387 SW |
588 | { |
589 | /* first, remove all old entries */ | |
3b300de3 | 590 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 591 | |
39c75a51 SE |
592 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
593 | "Sending REQUEST to %pM\n", backbone_gw->orig); | |
23721387 SW |
594 | |
595 | /* send request */ | |
3b300de3 | 596 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
acd34afa | 597 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
23721387 SW |
598 | |
599 | /* no local broadcasts should be sent or received, for now. */ | |
600 | if (!atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 601 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
602 | atomic_set(&backbone_gw->request_sent, 1); |
603 | } | |
604 | } | |
605 | ||
1b371d13 | 606 | /** |
04e14be6 | 607 | * batadv_bla_send_announce - Send an announcement frame |
1b371d13 | 608 | * @bat_priv: the bat priv with all the soft interface information |
23721387 | 609 | * @backbone_gw: our backbone gateway which should be announced |
23721387 | 610 | */ |
56303d34 | 611 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
bae98774 | 612 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 613 | { |
6b5e971a | 614 | u8 mac[ETH_ALEN]; |
3e2f1a1b | 615 | __be16 crc; |
23721387 | 616 | |
3b300de3 | 617 | memcpy(mac, batadv_announce_mac, 4); |
5a1dd8a4 | 618 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 619 | crc = htons(backbone_gw->crc); |
5a1dd8a4 | 620 | spin_unlock_bh(&backbone_gw->crc_lock); |
1a5852d8 | 621 | memcpy(&mac[4], &crc, 2); |
23721387 | 622 | |
3b300de3 | 623 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
acd34afa | 624 | BATADV_CLAIM_TYPE_ANNOUNCE); |
23721387 SW |
625 | } |
626 | ||
2c53040f BH |
627 | /** |
628 | * batadv_bla_add_claim - Adds a claim in the claim hash | |
629 | * @bat_priv: the bat priv with all the soft interface information | |
23721387 SW |
630 | * @mac: the mac address of the claim |
631 | * @vid: the VLAN ID of the frame | |
632 | * @backbone_gw: the backbone gateway which claims it | |
23721387 | 633 | */ |
56303d34 | 634 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
6b5e971a | 635 | const u8 *mac, const unsigned short vid, |
bae98774 | 636 | struct batadv_bla_backbone_gw *backbone_gw) |
23721387 | 637 | { |
712bbfe4 ML |
638 | struct batadv_bla_claim *claim; |
639 | struct batadv_bla_claim search_claim; | |
23721387 SW |
640 | int hash_added; |
641 | ||
8fdd0153 | 642 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 643 | search_claim.vid = vid; |
3b300de3 | 644 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
645 | |
646 | /* create a new claim entry if it does not exist yet. */ | |
647 | if (!claim) { | |
648 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
649 | if (!claim) | |
650 | return; | |
651 | ||
8fdd0153 | 652 | ether_addr_copy(claim->addr, mac); |
23721387 SW |
653 | claim->vid = vid; |
654 | claim->lasttime = jiffies; | |
655 | claim->backbone_gw = backbone_gw; | |
656 | ||
71b7e3d3 SE |
657 | kref_init(&claim->refcount); |
658 | kref_get(&claim->refcount); | |
39c75a51 | 659 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 660 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
5f80df67 | 661 | mac, BATADV_PRINT_VID(vid)); |
807736f6 | 662 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
3b300de3 SE |
663 | batadv_compare_claim, |
664 | batadv_choose_claim, claim, | |
665 | &claim->hash_entry); | |
23721387 SW |
666 | |
667 | if (unlikely(hash_added != 0)) { | |
668 | /* only local changes happened. */ | |
669 | kfree(claim); | |
670 | return; | |
671 | } | |
672 | } else { | |
673 | claim->lasttime = jiffies; | |
674 | if (claim->backbone_gw == backbone_gw) | |
675 | /* no need to register a new backbone */ | |
676 | goto claim_free_ref; | |
677 | ||
39c75a51 | 678 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 679 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
5f80df67 | 680 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 681 | |
5a1dd8a4 | 682 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
bbb1f90e | 683 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 684 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
3b300de3 | 685 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
23721387 SW |
686 | } |
687 | /* set (new) backbone gw */ | |
06e56ded | 688 | kref_get(&backbone_gw->refcount); |
23721387 SW |
689 | claim->backbone_gw = backbone_gw; |
690 | ||
5a1dd8a4 | 691 | spin_lock_bh(&backbone_gw->crc_lock); |
23721387 | 692 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 693 | spin_unlock_bh(&backbone_gw->crc_lock); |
23721387 SW |
694 | backbone_gw->lasttime = jiffies; |
695 | ||
696 | claim_free_ref: | |
3b300de3 | 697 | batadv_claim_free_ref(claim); |
23721387 SW |
698 | } |
699 | ||
04e14be6 SW |
700 | /** |
701 | * batadv_bla_del_claim - delete a claim from the claim hash | |
702 | * @bat_priv: the bat priv with all the soft interface information | |
703 | * @mac: mac address of the claim to be removed | |
704 | * @vid: VLAN id for the claim to be removed | |
23721387 | 705 | */ |
56303d34 | 706 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
6b5e971a | 707 | const u8 *mac, const unsigned short vid) |
23721387 | 708 | { |
712bbfe4 | 709 | struct batadv_bla_claim search_claim, *claim; |
23721387 | 710 | |
8fdd0153 | 711 | ether_addr_copy(search_claim.addr, mac); |
23721387 | 712 | search_claim.vid = vid; |
3b300de3 | 713 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
714 | if (!claim) |
715 | return; | |
716 | ||
39c75a51 | 717 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
5f80df67 | 718 | mac, BATADV_PRINT_VID(vid)); |
23721387 | 719 | |
807736f6 | 720 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
3b300de3 SE |
721 | batadv_choose_claim, claim); |
722 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ | |
23721387 | 723 | |
5a1dd8a4 | 724 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
23721387 | 725 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
5a1dd8a4 | 726 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
23721387 SW |
727 | |
728 | /* don't need the reference from hash_find() anymore */ | |
3b300de3 | 729 | batadv_claim_free_ref(claim); |
23721387 SW |
730 | } |
731 | ||
62fe710f SE |
732 | /** |
733 | * batadv_handle_announce - check for ANNOUNCE frame | |
04e14be6 SW |
734 | * @bat_priv: the bat priv with all the soft interface information |
735 | * @an_addr: announcement mac address (ARP Sender HW address) | |
736 | * @backbone_addr: originator address of the sender (Ethernet source MAC) | |
737 | * @vid: the VLAN ID of the frame | |
62fe710f SE |
738 | * |
739 | * Return: 1 if handled | |
740 | */ | |
6b5e971a SE |
741 | static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
742 | u8 *backbone_addr, unsigned short vid) | |
23721387 | 743 | { |
bae98774 | 744 | struct batadv_bla_backbone_gw *backbone_gw; |
5a1dd8a4 | 745 | u16 backbone_crc, crc; |
23721387 | 746 | |
3b300de3 | 747 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
23721387 SW |
748 | return 0; |
749 | ||
52aebd6a SW |
750 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
751 | false); | |
23721387 SW |
752 | |
753 | if (unlikely(!backbone_gw)) | |
754 | return 1; | |
755 | ||
23721387 SW |
756 | /* handle as ANNOUNCE frame */ |
757 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 758 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 | 759 | |
39c75a51 | 760 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 761 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
5f80df67 | 762 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
23721387 | 763 | |
5a1dd8a4 SW |
764 | spin_lock_bh(&backbone_gw->crc_lock); |
765 | backbone_crc = backbone_gw->crc; | |
766 | spin_unlock_bh(&backbone_gw->crc_lock); | |
767 | ||
768 | if (backbone_crc != crc) { | |
39c75a51 | 769 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
39a32991 | 770 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
5f80df67 AQ |
771 | backbone_gw->orig, |
772 | BATADV_PRINT_VID(backbone_gw->vid), | |
5a1dd8a4 | 773 | backbone_crc, crc); |
23721387 | 774 | |
3b300de3 | 775 | batadv_bla_send_request(backbone_gw); |
23721387 SW |
776 | } else { |
777 | /* if we have sent a request and the crc was OK, | |
778 | * we can allow traffic again. | |
779 | */ | |
780 | if (atomic_read(&backbone_gw->request_sent)) { | |
807736f6 | 781 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
23721387 SW |
782 | atomic_set(&backbone_gw->request_sent, 0); |
783 | } | |
784 | } | |
785 | ||
3b300de3 | 786 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
787 | return 1; |
788 | } | |
789 | ||
62fe710f SE |
790 | /** |
791 | * batadv_handle_request - check for REQUEST frame | |
04e14be6 SW |
792 | * @bat_priv: the bat priv with all the soft interface information |
793 | * @primary_if: the primary hard interface of this batman soft interface | |
794 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) | |
795 | * @ethhdr: ethernet header of a packet | |
796 | * @vid: the VLAN ID of the frame | |
62fe710f SE |
797 | * |
798 | * Return: 1 if handled | |
799 | */ | |
56303d34 SE |
800 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
801 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
802 | u8 *backbone_addr, struct ethhdr *ethhdr, |
803 | unsigned short vid) | |
23721387 SW |
804 | { |
805 | /* check for REQUEST frame */ | |
1eda58bf | 806 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
23721387 SW |
807 | return 0; |
808 | ||
809 | /* sanity check, this should not happen on a normal switch, | |
810 | * we ignore it in this case. | |
811 | */ | |
1eda58bf | 812 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
23721387 SW |
813 | return 1; |
814 | ||
39c75a51 | 815 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 816 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
5f80df67 | 817 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
23721387 | 818 | |
3b300de3 | 819 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
23721387 SW |
820 | return 1; |
821 | } | |
822 | ||
62fe710f SE |
823 | /** |
824 | * batadv_handle_unclaim - check for UNCLAIM frame | |
04e14be6 SW |
825 | * @bat_priv: the bat priv with all the soft interface information |
826 | * @primary_if: the primary hard interface of this batman soft interface | |
827 | * @backbone_addr: originator address of the backbone (Ethernet source) | |
828 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) | |
829 | * @vid: the VLAN ID of the frame | |
62fe710f SE |
830 | * |
831 | * Return: 1 if handled | |
832 | */ | |
56303d34 SE |
833 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
834 | struct batadv_hard_iface *primary_if, | |
6b5e971a SE |
835 | u8 *backbone_addr, u8 *claim_addr, |
836 | unsigned short vid) | |
23721387 | 837 | { |
bae98774 | 838 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
839 | |
840 | /* unclaim in any case if it is our own */ | |
1eda58bf SE |
841 | if (primary_if && batadv_compare_eth(backbone_addr, |
842 | primary_if->net_dev->dev_addr)) | |
3b300de3 | 843 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 844 | BATADV_CLAIM_TYPE_UNCLAIM); |
23721387 | 845 | |
3b300de3 | 846 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
23721387 SW |
847 | |
848 | if (!backbone_gw) | |
849 | return 1; | |
850 | ||
851 | /* this must be an UNCLAIM frame */ | |
39c75a51 | 852 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 853 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
5f80df67 | 854 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
23721387 | 855 | |
3b300de3 SE |
856 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
857 | batadv_backbone_gw_free_ref(backbone_gw); | |
23721387 SW |
858 | return 1; |
859 | } | |
860 | ||
62fe710f SE |
861 | /** |
862 | * batadv_handle_claim - check for CLAIM frame | |
04e14be6 SW |
863 | * @bat_priv: the bat priv with all the soft interface information |
864 | * @primary_if: the primary hard interface of this batman soft interface | |
865 | * @backbone_addr: originator address of the backbone (Ethernet Source) | |
866 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) | |
867 | * @vid: the VLAN ID of the frame | |
62fe710f SE |
868 | * |
869 | * Return: 1 if handled | |
870 | */ | |
56303d34 SE |
871 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
872 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 873 | u8 *backbone_addr, u8 *claim_addr, |
eb2deb6b | 874 | unsigned short vid) |
23721387 | 875 | { |
bae98774 | 876 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 SW |
877 | |
878 | /* register the gateway if not yet available, and add the claim. */ | |
879 | ||
52aebd6a SW |
880 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
881 | false); | |
23721387 SW |
882 | |
883 | if (unlikely(!backbone_gw)) | |
884 | return 1; | |
885 | ||
886 | /* this must be a CLAIM frame */ | |
3b300de3 | 887 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
1eda58bf | 888 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
3b300de3 | 889 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
3eb8773e | 890 | BATADV_CLAIM_TYPE_CLAIM); |
23721387 SW |
891 | |
892 | /* TODO: we could call something like tt_local_del() here. */ | |
893 | ||
3b300de3 | 894 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
895 | return 1; |
896 | } | |
897 | ||
2c53040f | 898 | /** |
04e14be6 | 899 | * batadv_check_claim_group - check for claim group membership |
2c53040f | 900 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 901 | * @primary_if: the primary interface of this batman interface |
38ef3d1d SW |
902 | * @hw_src: the Hardware source in the ARP Header |
903 | * @hw_dst: the Hardware destination in the ARP Header | |
904 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
905 | * | |
906 | * checks if it is a claim packet and if its on the same group. | |
907 | * This function also applies the group ID of the sender | |
908 | * if it is in the same mesh. | |
909 | * | |
62fe710f | 910 | * Return: |
38ef3d1d SW |
911 | * 2 - if it is a claim packet and on the same group |
912 | * 1 - if is a claim packet from another group | |
913 | * 0 - if it is not a claim packet | |
914 | */ | |
56303d34 SE |
915 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
916 | struct batadv_hard_iface *primary_if, | |
6b5e971a | 917 | u8 *hw_src, u8 *hw_dst, |
3b300de3 | 918 | struct ethhdr *ethhdr) |
38ef3d1d | 919 | { |
6b5e971a | 920 | u8 *backbone_addr; |
56303d34 | 921 | struct batadv_orig_node *orig_node; |
96412690 | 922 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
38ef3d1d | 923 | |
96412690 | 924 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
807736f6 | 925 | bla_dst_own = &bat_priv->bla.claim_dest; |
38ef3d1d | 926 | |
38ef3d1d SW |
927 | /* if announcement packet, use the source, |
928 | * otherwise assume it is in the hw_src | |
929 | */ | |
930 | switch (bla_dst->type) { | |
3eb8773e | 931 | case BATADV_CLAIM_TYPE_CLAIM: |
38ef3d1d SW |
932 | backbone_addr = hw_src; |
933 | break; | |
acd34afa SE |
934 | case BATADV_CLAIM_TYPE_REQUEST: |
935 | case BATADV_CLAIM_TYPE_ANNOUNCE: | |
3eb8773e | 936 | case BATADV_CLAIM_TYPE_UNCLAIM: |
38ef3d1d SW |
937 | backbone_addr = ethhdr->h_source; |
938 | break; | |
939 | default: | |
940 | return 0; | |
941 | } | |
942 | ||
943 | /* don't accept claim frames from ourselves */ | |
1eda58bf | 944 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
38ef3d1d SW |
945 | return 0; |
946 | ||
947 | /* if its already the same group, it is fine. */ | |
948 | if (bla_dst->group == bla_dst_own->group) | |
949 | return 2; | |
950 | ||
951 | /* lets see if this originator is in our mesh */ | |
da641193 | 952 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
38ef3d1d SW |
953 | |
954 | /* dont accept claims from gateways which are not in | |
955 | * the same mesh or group. | |
956 | */ | |
957 | if (!orig_node) | |
958 | return 1; | |
959 | ||
960 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
961 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
39c75a51 | 962 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
39a32991 | 963 | "taking other backbones claim group: %#.4x\n", |
1eda58bf | 964 | ntohs(bla_dst->group)); |
38ef3d1d SW |
965 | bla_dst_own->group = bla_dst->group; |
966 | } | |
967 | ||
5d967310 | 968 | batadv_orig_node_put(orig_node); |
38ef3d1d SW |
969 | |
970 | return 2; | |
971 | } | |
972 | ||
1b371d13 | 973 | /** |
04e14be6 | 974 | * batadv_bla_process_claim - Check if this is a claim frame, and process it |
1b371d13 | 975 | * @bat_priv: the bat priv with all the soft interface information |
e3357189 | 976 | * @primary_if: the primary hard interface of this batman soft interface |
23721387 SW |
977 | * @skb: the frame to be checked |
978 | * | |
62fe710f | 979 | * Return: 1 if it was a claim frame, otherwise return 0 to |
23721387 SW |
980 | * tell the callee that it can use the frame on its own. |
981 | */ | |
56303d34 SE |
982 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
983 | struct batadv_hard_iface *primary_if, | |
3b300de3 | 984 | struct sk_buff *skb) |
23721387 | 985 | { |
d46b6bfa | 986 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
6b5e971a | 987 | u8 *hw_src, *hw_dst; |
d46b6bfa | 988 | struct vlan_hdr *vhdr, vhdr_buf; |
c018ad3d | 989 | struct ethhdr *ethhdr; |
23721387 | 990 | struct arphdr *arphdr; |
c018ad3d | 991 | unsigned short vid; |
d46b6bfa | 992 | int vlan_depth = 0; |
293e9338 | 993 | __be16 proto; |
23721387 | 994 | int headlen; |
38ef3d1d | 995 | int ret; |
23721387 | 996 | |
c018ad3d | 997 | vid = batadv_get_vid(skb, 0); |
7ed4be95 | 998 | ethhdr = eth_hdr(skb); |
23721387 | 999 | |
c018ad3d AQ |
1000 | proto = ethhdr->h_proto; |
1001 | headlen = ETH_HLEN; | |
1002 | if (vid & BATADV_VLAN_HAS_TAG) { | |
d46b6bfa SW |
1003 | /* Traverse the VLAN/Ethertypes. |
1004 | * | |
1005 | * At this point it is known that the first protocol is a VLAN | |
1006 | * header, so start checking at the encapsulated protocol. | |
1007 | * | |
1008 | * The depth of the VLAN headers is recorded to drop BLA claim | |
1009 | * frames encapsulated into multiple VLAN headers (QinQ). | |
1010 | */ | |
1011 | do { | |
1012 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, | |
1013 | &vhdr_buf); | |
1014 | if (!vhdr) | |
1015 | return 0; | |
1016 | ||
1017 | proto = vhdr->h_vlan_encapsulated_proto; | |
1018 | headlen += VLAN_HLEN; | |
1019 | vlan_depth++; | |
1020 | } while (proto == htons(ETH_P_8021Q)); | |
23721387 SW |
1021 | } |
1022 | ||
293e9338 | 1023 | if (proto != htons(ETH_P_ARP)) |
23721387 SW |
1024 | return 0; /* not a claim frame */ |
1025 | ||
1026 | /* this must be a ARP frame. check if it is a claim. */ | |
1027 | ||
1028 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
1029 | return 0; | |
1030 | ||
1031 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
7ed4be95 | 1032 | ethhdr = eth_hdr(skb); |
6b5e971a | 1033 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
23721387 SW |
1034 | |
1035 | /* Check whether the ARP frame carries a valid | |
1036 | * IP information | |
1037 | */ | |
23721387 SW |
1038 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
1039 | return 0; | |
1040 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
1041 | return 0; | |
1042 | if (arphdr->ar_hln != ETH_ALEN) | |
1043 | return 0; | |
1044 | if (arphdr->ar_pln != 4) | |
1045 | return 0; | |
1046 | ||
6b5e971a | 1047 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
23721387 | 1048 | hw_dst = hw_src + ETH_ALEN + 4; |
96412690 | 1049 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
d46b6bfa SW |
1050 | bla_dst_own = &bat_priv->bla.claim_dest; |
1051 | ||
1052 | /* check if it is a claim frame in general */ | |
1053 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
1054 | sizeof(bla_dst->magic)) != 0) | |
1055 | return 0; | |
1056 | ||
1057 | /* check if there is a claim frame encapsulated deeper in (QinQ) and | |
1058 | * drop that, as this is not supported by BLA but should also not be | |
1059 | * sent via the mesh. | |
1060 | */ | |
1061 | if (vlan_depth > 1) | |
1062 | return 1; | |
23721387 SW |
1063 | |
1064 | /* check if it is a claim frame. */ | |
3b300de3 SE |
1065 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
1066 | ethhdr); | |
38ef3d1d | 1067 | if (ret == 1) |
39c75a51 | 1068 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1069 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
5f80df67 AQ |
1070 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
1071 | hw_dst); | |
38ef3d1d SW |
1072 | |
1073 | if (ret < 2) | |
1074 | return ret; | |
23721387 SW |
1075 | |
1076 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
3b300de3 | 1077 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1078 | |
1079 | /* check for the different types of claim frames ... */ | |
1080 | switch (bla_dst->type) { | |
3eb8773e | 1081 | case BATADV_CLAIM_TYPE_CLAIM: |
3b300de3 SE |
1082 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
1083 | ethhdr->h_source, vid)) | |
23721387 SW |
1084 | return 1; |
1085 | break; | |
3eb8773e | 1086 | case BATADV_CLAIM_TYPE_UNCLAIM: |
3b300de3 SE |
1087 | if (batadv_handle_unclaim(bat_priv, primary_if, |
1088 | ethhdr->h_source, hw_src, vid)) | |
23721387 SW |
1089 | return 1; |
1090 | break; | |
1091 | ||
acd34afa | 1092 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
3b300de3 SE |
1093 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
1094 | vid)) | |
23721387 SW |
1095 | return 1; |
1096 | break; | |
acd34afa | 1097 | case BATADV_CLAIM_TYPE_REQUEST: |
3b300de3 SE |
1098 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
1099 | vid)) | |
23721387 SW |
1100 | return 1; |
1101 | break; | |
1102 | } | |
1103 | ||
39c75a51 | 1104 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf | 1105 | "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", |
5f80df67 | 1106 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
23721387 SW |
1107 | return 1; |
1108 | } | |
1109 | ||
04e14be6 SW |
1110 | /** |
1111 | * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or | |
1112 | * immediately | |
1113 | * @bat_priv: the bat priv with all the soft interface information | |
1114 | * @now: whether the whole hash shall be wiped now | |
1115 | * | |
1116 | * Check when we last heard from other nodes, and remove them in case of | |
23721387 SW |
1117 | * a time out, or clean all backbone gws if now is set. |
1118 | */ | |
56303d34 | 1119 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
23721387 | 1120 | { |
bae98774 | 1121 | struct batadv_bla_backbone_gw *backbone_gw; |
b67bfe0d | 1122 | struct hlist_node *node_tmp; |
23721387 | 1123 | struct hlist_head *head; |
5bf74e9c | 1124 | struct batadv_hashtable *hash; |
23721387 SW |
1125 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
1126 | int i; | |
1127 | ||
807736f6 | 1128 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1129 | if (!hash) |
1130 | return; | |
1131 | ||
1132 | for (i = 0; i < hash->size; i++) { | |
1133 | head = &hash->table[i]; | |
1134 | list_lock = &hash->list_locks[i]; | |
1135 | ||
1136 | spin_lock_bh(list_lock); | |
b67bfe0d | 1137 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
23721387 SW |
1138 | head, hash_entry) { |
1139 | if (now) | |
1140 | goto purge_now; | |
1eda58bf | 1141 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
42d0b044 | 1142 | BATADV_BLA_BACKBONE_TIMEOUT)) |
23721387 SW |
1143 | continue; |
1144 | ||
39c75a51 | 1145 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
1eda58bf SE |
1146 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
1147 | backbone_gw->orig); | |
23721387 SW |
1148 | |
1149 | purge_now: | |
1150 | /* don't wait for the pending request anymore */ | |
1151 | if (atomic_read(&backbone_gw->request_sent)) | |
807736f6 | 1152 | atomic_dec(&bat_priv->bla.num_requests); |
23721387 | 1153 | |
3b300de3 | 1154 | batadv_bla_del_backbone_claims(backbone_gw); |
23721387 | 1155 | |
b67bfe0d | 1156 | hlist_del_rcu(&backbone_gw->hash_entry); |
3b300de3 | 1157 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1158 | } |
1159 | spin_unlock_bh(list_lock); | |
1160 | } | |
1161 | } | |
1162 | ||
2c53040f | 1163 | /** |
04e14be6 | 1164 | * batadv_bla_purge_claims - Remove claims after a timeout or immediately |
2c53040f | 1165 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1166 | * @primary_if: the selected primary interface, may be NULL if now is set |
1167 | * @now: whether the whole hash shall be wiped now | |
1168 | * | |
1169 | * Check when we heard last time from our own claims, and remove them in case of | |
1170 | * a time out, or clean all claims if now is set | |
1171 | */ | |
56303d34 SE |
1172 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
1173 | struct batadv_hard_iface *primary_if, | |
1174 | int now) | |
23721387 | 1175 | { |
712bbfe4 | 1176 | struct batadv_bla_claim *claim; |
23721387 | 1177 | struct hlist_head *head; |
5bf74e9c | 1178 | struct batadv_hashtable *hash; |
23721387 SW |
1179 | int i; |
1180 | ||
807736f6 | 1181 | hash = bat_priv->bla.claim_hash; |
23721387 SW |
1182 | if (!hash) |
1183 | return; | |
1184 | ||
1185 | for (i = 0; i < hash->size; i++) { | |
1186 | head = &hash->table[i]; | |
1187 | ||
1188 | rcu_read_lock(); | |
b67bfe0d | 1189 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
23721387 SW |
1190 | if (now) |
1191 | goto purge_now; | |
1eda58bf SE |
1192 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
1193 | primary_if->net_dev->dev_addr)) | |
23721387 | 1194 | continue; |
1eda58bf | 1195 | if (!batadv_has_timed_out(claim->lasttime, |
42d0b044 | 1196 | BATADV_BLA_CLAIM_TIMEOUT)) |
23721387 SW |
1197 | continue; |
1198 | ||
39c75a51 | 1199 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
1eda58bf SE |
1200 | "bla_purge_claims(): %pM, vid %d, time out\n", |
1201 | claim->addr, claim->vid); | |
23721387 SW |
1202 | |
1203 | purge_now: | |
3b300de3 SE |
1204 | batadv_handle_unclaim(bat_priv, primary_if, |
1205 | claim->backbone_gw->orig, | |
1206 | claim->addr, claim->vid); | |
23721387 SW |
1207 | } |
1208 | rcu_read_unlock(); | |
1209 | } | |
1210 | } | |
1211 | ||
2c53040f | 1212 | /** |
04e14be6 SW |
1213 | * batadv_bla_update_orig_address - Update the backbone gateways when the own |
1214 | * originator address changes | |
2c53040f | 1215 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1216 | * @primary_if: the new selected primary_if |
1217 | * @oldif: the old primary interface, may be NULL | |
23721387 | 1218 | */ |
56303d34 SE |
1219 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
1220 | struct batadv_hard_iface *primary_if, | |
1221 | struct batadv_hard_iface *oldif) | |
23721387 | 1222 | { |
bae98774 | 1223 | struct batadv_bla_backbone_gw *backbone_gw; |
23721387 | 1224 | struct hlist_head *head; |
5bf74e9c | 1225 | struct batadv_hashtable *hash; |
807736f6 | 1226 | __be16 group; |
23721387 SW |
1227 | int i; |
1228 | ||
38ef3d1d | 1229 | /* reset bridge loop avoidance group id */ |
807736f6 SE |
1230 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
1231 | bat_priv->bla.claim_dest.group = group; | |
38ef3d1d | 1232 | |
d5b4c93e SW |
1233 | /* purge everything when bridge loop avoidance is turned off */ |
1234 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1235 | oldif = NULL; | |
1236 | ||
23721387 | 1237 | if (!oldif) { |
3b300de3 SE |
1238 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
1239 | batadv_bla_purge_backbone_gw(bat_priv, 1); | |
23721387 SW |
1240 | return; |
1241 | } | |
1242 | ||
807736f6 | 1243 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1244 | if (!hash) |
1245 | return; | |
1246 | ||
1247 | for (i = 0; i < hash->size; i++) { | |
1248 | head = &hash->table[i]; | |
1249 | ||
1250 | rcu_read_lock(); | |
b67bfe0d | 1251 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
23721387 | 1252 | /* own orig still holds the old value. */ |
1eda58bf SE |
1253 | if (!batadv_compare_eth(backbone_gw->orig, |
1254 | oldif->net_dev->dev_addr)) | |
23721387 SW |
1255 | continue; |
1256 | ||
8fdd0153 AQ |
1257 | ether_addr_copy(backbone_gw->orig, |
1258 | primary_if->net_dev->dev_addr); | |
23721387 SW |
1259 | /* send an announce frame so others will ask for our |
1260 | * claims and update their tables. | |
1261 | */ | |
3b300de3 | 1262 | batadv_bla_send_announce(bat_priv, backbone_gw); |
23721387 SW |
1263 | } |
1264 | rcu_read_unlock(); | |
1265 | } | |
1266 | } | |
1267 | ||
d68081a2 SW |
1268 | /** |
1269 | * batadv_bla_status_update - purge bla interfaces if necessary | |
1270 | * @net_dev: the soft interface net device | |
1271 | */ | |
1272 | void batadv_bla_status_update(struct net_device *net_dev) | |
1273 | { | |
1274 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1275 | struct batadv_hard_iface *primary_if; | |
1276 | ||
1277 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1278 | if (!primary_if) | |
1279 | return; | |
1280 | ||
1281 | /* this function already purges everything when bla is disabled, | |
1282 | * so just call that one. | |
1283 | */ | |
1284 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); | |
1285 | batadv_hardif_free_ref(primary_if); | |
1286 | } | |
1287 | ||
04e14be6 SW |
1288 | /** |
1289 | * batadv_bla_periodic_work - performs periodic bla work | |
1290 | * @work: kernel work struct | |
1291 | * | |
1292 | * periodic work to do: | |
23721387 SW |
1293 | * * purge structures when they are too old |
1294 | * * send announcements | |
1295 | */ | |
3b300de3 | 1296 | static void batadv_bla_periodic_work(struct work_struct *work) |
23721387 | 1297 | { |
bbb1f90e | 1298 | struct delayed_work *delayed_work; |
56303d34 | 1299 | struct batadv_priv *bat_priv; |
807736f6 | 1300 | struct batadv_priv_bla *priv_bla; |
23721387 | 1301 | struct hlist_head *head; |
bae98774 | 1302 | struct batadv_bla_backbone_gw *backbone_gw; |
5bf74e9c | 1303 | struct batadv_hashtable *hash; |
56303d34 | 1304 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1305 | int i; |
1306 | ||
bbb1f90e | 1307 | delayed_work = container_of(work, struct delayed_work, work); |
807736f6 SE |
1308 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
1309 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); | |
e5d89254 | 1310 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1311 | if (!primary_if) |
1312 | goto out; | |
1313 | ||
3b300de3 SE |
1314 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
1315 | batadv_bla_purge_backbone_gw(bat_priv, 0); | |
23721387 SW |
1316 | |
1317 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1318 | goto out; | |
1319 | ||
807736f6 | 1320 | hash = bat_priv->bla.backbone_hash; |
23721387 SW |
1321 | if (!hash) |
1322 | goto out; | |
1323 | ||
1324 | for (i = 0; i < hash->size; i++) { | |
1325 | head = &hash->table[i]; | |
1326 | ||
1327 | rcu_read_lock(); | |
b67bfe0d | 1328 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
1eda58bf SE |
1329 | if (!batadv_compare_eth(backbone_gw->orig, |
1330 | primary_if->net_dev->dev_addr)) | |
23721387 SW |
1331 | continue; |
1332 | ||
1333 | backbone_gw->lasttime = jiffies; | |
1334 | ||
3b300de3 | 1335 | batadv_bla_send_announce(bat_priv, backbone_gw); |
d807f272 SW |
1336 | |
1337 | /* request_sent is only set after creation to avoid | |
1338 | * problems when we are not yet known as backbone gw | |
1339 | * in the backbone. | |
1340 | * | |
28709878 SW |
1341 | * We can reset this now after we waited some periods |
1342 | * to give bridge forward delays and bla group forming | |
1343 | * some grace time. | |
d807f272 SW |
1344 | */ |
1345 | ||
1346 | if (atomic_read(&backbone_gw->request_sent) == 0) | |
1347 | continue; | |
1348 | ||
28709878 SW |
1349 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
1350 | continue; | |
1351 | ||
d807f272 SW |
1352 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
1353 | atomic_set(&backbone_gw->request_sent, 0); | |
23721387 SW |
1354 | } |
1355 | rcu_read_unlock(); | |
1356 | } | |
1357 | out: | |
1358 | if (primary_if) | |
e5d89254 | 1359 | batadv_hardif_free_ref(primary_if); |
23721387 | 1360 | |
72414442 AQ |
1361 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
1362 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
23721387 SW |
1363 | } |
1364 | ||
5d52dad2 SE |
1365 | /* The hash for claim and backbone hash receive the same key because they |
1366 | * are getting initialized by hash_new with the same key. Reinitializing | |
1367 | * them with to different keys to allow nested locking without generating | |
1368 | * lockdep warnings | |
1369 | */ | |
3b300de3 SE |
1370 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
1371 | static struct lock_class_key batadv_backbone_hash_lock_class_key; | |
5d52dad2 | 1372 | |
04e14be6 SW |
1373 | /** |
1374 | * batadv_bla_init - initialize all bla structures | |
1375 | * @bat_priv: the bat priv with all the soft interface information | |
1376 | * | |
1377 | * Return: 0 on success, < 0 on error. | |
1378 | */ | |
56303d34 | 1379 | int batadv_bla_init(struct batadv_priv *bat_priv) |
23721387 | 1380 | { |
fe2da6ff | 1381 | int i; |
6b5e971a | 1382 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
56303d34 | 1383 | struct batadv_hard_iface *primary_if; |
6b5e971a | 1384 | u16 crc; |
807736f6 | 1385 | unsigned long entrytime; |
fe2da6ff | 1386 | |
7dac7b76 LL |
1387 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
1388 | ||
39c75a51 | 1389 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
23721387 | 1390 | |
38ef3d1d | 1391 | /* setting claim destination address */ |
807736f6 SE |
1392 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
1393 | bat_priv->bla.claim_dest.type = 0; | |
e5d89254 | 1394 | primary_if = batadv_primary_if_get_selected(bat_priv); |
38ef3d1d | 1395 | if (primary_if) { |
807736f6 SE |
1396 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
1397 | bat_priv->bla.claim_dest.group = htons(crc); | |
e5d89254 | 1398 | batadv_hardif_free_ref(primary_if); |
38ef3d1d | 1399 | } else { |
807736f6 | 1400 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
38ef3d1d SW |
1401 | } |
1402 | ||
fe2da6ff | 1403 | /* initialize the duplicate list */ |
807736f6 | 1404 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
42d0b044 | 1405 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
807736f6 SE |
1406 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
1407 | bat_priv->bla.bcast_duplist_curr = 0; | |
fe2da6ff | 1408 | |
807736f6 | 1409 | if (bat_priv->bla.claim_hash) |
5346c35e | 1410 | return 0; |
23721387 | 1411 | |
807736f6 SE |
1412 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
1413 | bat_priv->bla.backbone_hash = batadv_hash_new(32); | |
23721387 | 1414 | |
807736f6 | 1415 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
5346c35e | 1416 | return -ENOMEM; |
23721387 | 1417 | |
807736f6 | 1418 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
3b300de3 | 1419 | &batadv_claim_hash_lock_class_key); |
807736f6 | 1420 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
3b300de3 | 1421 | &batadv_backbone_hash_lock_class_key); |
5d52dad2 | 1422 | |
39c75a51 | 1423 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
23721387 | 1424 | |
72414442 AQ |
1425 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
1426 | ||
1427 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, | |
1428 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); | |
5346c35e | 1429 | return 0; |
23721387 SW |
1430 | } |
1431 | ||
2c53040f | 1432 | /** |
04e14be6 | 1433 | * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. |
2c53040f | 1434 | * @bat_priv: the bat priv with all the soft interface information |
004e86fc | 1435 | * @skb: contains the bcast_packet to be checked |
fe2da6ff SW |
1436 | * |
1437 | * check if it is on our broadcast list. Another gateway might | |
1438 | * have sent the same packet because it is connected to the same backbone, | |
1439 | * so we have to remove this duplicate. | |
1440 | * | |
1441 | * This is performed by checking the CRC, which will tell us | |
1442 | * with a good chance that it is the same packet. If it is furthermore | |
1443 | * sent by another host, drop it. We allow equal packets from | |
1444 | * the same host however as this might be intended. | |
04e14be6 SW |
1445 | * |
1446 | * Return: 1 if a packet is in the duplicate list, 0 otherwise. | |
9cfc7bd6 | 1447 | */ |
56303d34 | 1448 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
004e86fc | 1449 | struct sk_buff *skb) |
fe2da6ff | 1450 | { |
004e86fc SW |
1451 | int i, curr, ret = 0; |
1452 | __be32 crc; | |
1453 | struct batadv_bcast_packet *bcast_packet; | |
56303d34 | 1454 | struct batadv_bcast_duplist_entry *entry; |
fe2da6ff | 1455 | |
004e86fc | 1456 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
fe2da6ff SW |
1457 | |
1458 | /* calculate the crc ... */ | |
004e86fc | 1459 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
fe2da6ff | 1460 | |
7dac7b76 LL |
1461 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
1462 | ||
42d0b044 | 1463 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
807736f6 SE |
1464 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
1465 | curr %= BATADV_DUPLIST_SIZE; | |
1466 | entry = &bat_priv->bla.bcast_duplist[curr]; | |
fe2da6ff SW |
1467 | |
1468 | /* we can stop searching if the entry is too old ; | |
1469 | * later entries will be even older | |
1470 | */ | |
42d0b044 SE |
1471 | if (batadv_has_timed_out(entry->entrytime, |
1472 | BATADV_DUPLIST_TIMEOUT)) | |
fe2da6ff SW |
1473 | break; |
1474 | ||
1475 | if (entry->crc != crc) | |
1476 | continue; | |
1477 | ||
1eda58bf | 1478 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
fe2da6ff SW |
1479 | continue; |
1480 | ||
1481 | /* this entry seems to match: same crc, not too old, | |
1482 | * and from another gw. therefore return 1 to forbid it. | |
1483 | */ | |
7dac7b76 LL |
1484 | ret = 1; |
1485 | goto out; | |
fe2da6ff | 1486 | } |
7dac7b76 | 1487 | /* not found, add a new entry (overwrite the oldest entry) |
3f68785e | 1488 | * and allow it, its the first occurrence. |
7dac7b76 | 1489 | */ |
807736f6 | 1490 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
42d0b044 | 1491 | curr %= BATADV_DUPLIST_SIZE; |
807736f6 | 1492 | entry = &bat_priv->bla.bcast_duplist[curr]; |
fe2da6ff SW |
1493 | entry->crc = crc; |
1494 | entry->entrytime = jiffies; | |
8fdd0153 | 1495 | ether_addr_copy(entry->orig, bcast_packet->orig); |
807736f6 | 1496 | bat_priv->bla.bcast_duplist_curr = curr; |
fe2da6ff | 1497 | |
7dac7b76 LL |
1498 | out: |
1499 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); | |
1500 | ||
1501 | return ret; | |
fe2da6ff SW |
1502 | } |
1503 | ||
1b371d13 | 1504 | /** |
04e14be6 SW |
1505 | * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for |
1506 | * the VLAN identified by vid. | |
1b371d13 | 1507 | * @bat_priv: the bat priv with all the soft interface information |
20ff9d59 | 1508 | * @orig: originator mac address |
cfd4f757 | 1509 | * @vid: VLAN identifier |
20ff9d59 | 1510 | * |
62fe710f | 1511 | * Return: true if orig is a backbone for this vid, false otherwise. |
20ff9d59 | 1512 | */ |
6b5e971a | 1513 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
cfd4f757 | 1514 | unsigned short vid) |
20ff9d59 | 1515 | { |
807736f6 | 1516 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
20ff9d59 | 1517 | struct hlist_head *head; |
bae98774 | 1518 | struct batadv_bla_backbone_gw *backbone_gw; |
20ff9d59 SW |
1519 | int i; |
1520 | ||
1521 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
cfd4f757 | 1522 | return false; |
20ff9d59 SW |
1523 | |
1524 | if (!hash) | |
cfd4f757 | 1525 | return false; |
20ff9d59 SW |
1526 | |
1527 | for (i = 0; i < hash->size; i++) { | |
1528 | head = &hash->table[i]; | |
1529 | ||
1530 | rcu_read_lock(); | |
b67bfe0d | 1531 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
cfd4f757 AQ |
1532 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
1533 | backbone_gw->vid == vid) { | |
20ff9d59 | 1534 | rcu_read_unlock(); |
cfd4f757 | 1535 | return true; |
20ff9d59 SW |
1536 | } |
1537 | } | |
1538 | rcu_read_unlock(); | |
1539 | } | |
1540 | ||
cfd4f757 | 1541 | return false; |
20ff9d59 SW |
1542 | } |
1543 | ||
2c53040f | 1544 | /** |
04e14be6 | 1545 | * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. |
2c53040f | 1546 | * @skb: the frame to be checked |
23721387 SW |
1547 | * @orig_node: the orig_node of the frame |
1548 | * @hdr_size: maximum length of the frame | |
1549 | * | |
62fe710f SE |
1550 | * Return: 1 if the orig_node is also a gateway on the soft interface, otherwise |
1551 | * it returns 0. | |
23721387 | 1552 | */ |
08adf151 | 1553 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
56303d34 | 1554 | struct batadv_orig_node *orig_node, int hdr_size) |
23721387 | 1555 | { |
bae98774 | 1556 | struct batadv_bla_backbone_gw *backbone_gw; |
c018ad3d | 1557 | unsigned short vid; |
23721387 SW |
1558 | |
1559 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1560 | return 0; | |
1561 | ||
1562 | /* first, find out the vid. */ | |
0d125074 | 1563 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1564 | return 0; |
1565 | ||
c018ad3d | 1566 | vid = batadv_get_vid(skb, hdr_size); |
23721387 SW |
1567 | |
1568 | /* see if this originator is a backbone gw for this VLAN */ | |
3b300de3 SE |
1569 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
1570 | orig_node->orig, vid); | |
23721387 SW |
1571 | if (!backbone_gw) |
1572 | return 0; | |
1573 | ||
3b300de3 | 1574 | batadv_backbone_gw_free_ref(backbone_gw); |
23721387 SW |
1575 | return 1; |
1576 | } | |
1577 | ||
04e14be6 SW |
1578 | /** |
1579 | * batadv_bla_init - free all bla structures | |
1580 | * @bat_priv: the bat priv with all the soft interface information | |
1581 | * | |
1582 | * for softinterface free or module unload | |
1583 | */ | |
56303d34 | 1584 | void batadv_bla_free(struct batadv_priv *bat_priv) |
23721387 | 1585 | { |
56303d34 | 1586 | struct batadv_hard_iface *primary_if; |
23721387 | 1587 | |
807736f6 | 1588 | cancel_delayed_work_sync(&bat_priv->bla.work); |
e5d89254 | 1589 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 | 1590 | |
807736f6 | 1591 | if (bat_priv->bla.claim_hash) { |
3b300de3 | 1592 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
807736f6 SE |
1593 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
1594 | bat_priv->bla.claim_hash = NULL; | |
23721387 | 1595 | } |
807736f6 | 1596 | if (bat_priv->bla.backbone_hash) { |
3b300de3 | 1597 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
807736f6 SE |
1598 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
1599 | bat_priv->bla.backbone_hash = NULL; | |
23721387 SW |
1600 | } |
1601 | if (primary_if) | |
e5d89254 | 1602 | batadv_hardif_free_ref(primary_if); |
23721387 SW |
1603 | } |
1604 | ||
2c53040f | 1605 | /** |
04e14be6 | 1606 | * batadv_bla_rx - check packets coming from the mesh. |
2c53040f | 1607 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1608 | * @skb: the frame to be checked |
1609 | * @vid: the VLAN ID of the frame | |
2d3f6ccc | 1610 | * @is_bcast: the packet came in a broadcast packet type. |
23721387 | 1611 | * |
04e14be6 | 1612 | * batadv_bla_rx avoidance checks if: |
23721387 SW |
1613 | * * we have to race for a claim |
1614 | * * if the frame is allowed on the LAN | |
1615 | * | |
62fe710f SE |
1616 | * in these cases, the skb is further handled by this function |
1617 | * | |
1618 | * Return: 1 if handled, otherwise it returns 0 and the caller shall further | |
23721387 | 1619 | * process the skb. |
23721387 | 1620 | */ |
eb2deb6b AQ |
1621 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1622 | unsigned short vid, bool is_bcast) | |
23721387 SW |
1623 | { |
1624 | struct ethhdr *ethhdr; | |
712bbfe4 | 1625 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1626 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1627 | int ret; |
1628 | ||
7ed4be95 | 1629 | ethhdr = eth_hdr(skb); |
23721387 | 1630 | |
e5d89254 | 1631 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1632 | if (!primary_if) |
1633 | goto handled; | |
1634 | ||
1635 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1636 | goto allow; | |
1637 | ||
807736f6 | 1638 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 | 1639 | /* don't allow broadcasts while requests are in flight */ |
2d3f6ccc | 1640 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
23721387 SW |
1641 | goto handled; |
1642 | ||
8fdd0153 | 1643 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 | 1644 | search_claim.vid = vid; |
3b300de3 | 1645 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1646 | |
1647 | if (!claim) { | |
1648 | /* possible optimization: race for a claim */ | |
1649 | /* No claim exists yet, claim it for us! | |
1650 | */ | |
3b300de3 SE |
1651 | batadv_handle_claim(bat_priv, primary_if, |
1652 | primary_if->net_dev->dev_addr, | |
1653 | ethhdr->h_source, vid); | |
23721387 SW |
1654 | goto allow; |
1655 | } | |
1656 | ||
1657 | /* if it is our own claim ... */ | |
1eda58bf SE |
1658 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1659 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1660 | /* ... allow it in any case */ |
1661 | claim->lasttime = jiffies; | |
1662 | goto allow; | |
1663 | } | |
1664 | ||
1665 | /* if it is a broadcast ... */ | |
2d3f6ccc SW |
1666 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
1667 | /* ... drop it. the responsible gateway is in charge. | |
1668 | * | |
1669 | * We need to check is_bcast because with the gateway | |
1670 | * feature, broadcasts (like DHCP requests) may be sent | |
1671 | * using a unicast packet type. | |
1672 | */ | |
23721387 SW |
1673 | goto handled; |
1674 | } else { | |
1675 | /* seems the client considers us as its best gateway. | |
1676 | * send a claim and update the claim table | |
1677 | * immediately. | |
1678 | */ | |
3b300de3 SE |
1679 | batadv_handle_claim(bat_priv, primary_if, |
1680 | primary_if->net_dev->dev_addr, | |
1681 | ethhdr->h_source, vid); | |
23721387 SW |
1682 | goto allow; |
1683 | } | |
1684 | allow: | |
3b300de3 | 1685 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1686 | ret = 0; |
1687 | goto out; | |
1688 | ||
1689 | handled: | |
1690 | kfree_skb(skb); | |
1691 | ret = 1; | |
1692 | ||
1693 | out: | |
1694 | if (primary_if) | |
e5d89254 | 1695 | batadv_hardif_free_ref(primary_if); |
23721387 | 1696 | if (claim) |
3b300de3 | 1697 | batadv_claim_free_ref(claim); |
23721387 SW |
1698 | return ret; |
1699 | } | |
1700 | ||
2c53040f | 1701 | /** |
04e14be6 | 1702 | * batadv_bla_tx - check packets going into the mesh |
2c53040f | 1703 | * @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1704 | * @skb: the frame to be checked |
1705 | * @vid: the VLAN ID of the frame | |
1706 | * | |
04e14be6 | 1707 | * batadv_bla_tx checks if: |
23721387 SW |
1708 | * * a claim was received which has to be processed |
1709 | * * the frame is allowed on the mesh | |
1710 | * | |
62fe710f | 1711 | * in these cases, the skb is further handled by this function. |
9d2c9488 LL |
1712 | * |
1713 | * This call might reallocate skb data. | |
62fe710f SE |
1714 | * |
1715 | * Return: 1 if handled, otherwise it returns 0 and the caller shall further | |
1716 | * process the skb. | |
23721387 | 1717 | */ |
eb2deb6b AQ |
1718 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
1719 | unsigned short vid) | |
23721387 SW |
1720 | { |
1721 | struct ethhdr *ethhdr; | |
712bbfe4 | 1722 | struct batadv_bla_claim search_claim, *claim = NULL; |
56303d34 | 1723 | struct batadv_hard_iface *primary_if; |
23721387 SW |
1724 | int ret = 0; |
1725 | ||
e5d89254 | 1726 | primary_if = batadv_primary_if_get_selected(bat_priv); |
23721387 SW |
1727 | if (!primary_if) |
1728 | goto out; | |
1729 | ||
1730 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1731 | goto allow; | |
1732 | ||
3b300de3 | 1733 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
23721387 SW |
1734 | goto handled; |
1735 | ||
7ed4be95 | 1736 | ethhdr = eth_hdr(skb); |
23721387 | 1737 | |
807736f6 | 1738 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
23721387 SW |
1739 | /* don't allow broadcasts while requests are in flight */ |
1740 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1741 | goto handled; | |
1742 | ||
8fdd0153 | 1743 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
23721387 SW |
1744 | search_claim.vid = vid; |
1745 | ||
3b300de3 | 1746 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
23721387 SW |
1747 | |
1748 | /* if no claim exists, allow it. */ | |
1749 | if (!claim) | |
1750 | goto allow; | |
1751 | ||
1752 | /* check if we are responsible. */ | |
1eda58bf SE |
1753 | if (batadv_compare_eth(claim->backbone_gw->orig, |
1754 | primary_if->net_dev->dev_addr)) { | |
23721387 SW |
1755 | /* if yes, the client has roamed and we have |
1756 | * to unclaim it. | |
1757 | */ | |
3b300de3 SE |
1758 | batadv_handle_unclaim(bat_priv, primary_if, |
1759 | primary_if->net_dev->dev_addr, | |
1760 | ethhdr->h_source, vid); | |
23721387 SW |
1761 | goto allow; |
1762 | } | |
1763 | ||
1764 | /* check if it is a multicast/broadcast frame */ | |
1765 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1766 | /* drop it. the responsible gateway has forwarded it into | |
1767 | * the backbone network. | |
1768 | */ | |
1769 | goto handled; | |
1770 | } else { | |
1771 | /* we must allow it. at least if we are | |
1772 | * responsible for the DESTINATION. | |
1773 | */ | |
1774 | goto allow; | |
1775 | } | |
1776 | allow: | |
3b300de3 | 1777 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
23721387 SW |
1778 | ret = 0; |
1779 | goto out; | |
1780 | handled: | |
1781 | ret = 1; | |
1782 | out: | |
1783 | if (primary_if) | |
e5d89254 | 1784 | batadv_hardif_free_ref(primary_if); |
23721387 | 1785 | if (claim) |
3b300de3 | 1786 | batadv_claim_free_ref(claim); |
23721387 SW |
1787 | return ret; |
1788 | } | |
9bf8e4d4 | 1789 | |
04e14be6 SW |
1790 | /** |
1791 | * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file | |
1792 | * @seq: seq file to print on | |
1793 | * @offset: not used | |
1794 | * | |
1795 | * Return: always 0 | |
1796 | */ | |
08adf151 | 1797 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1798 | { |
1799 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1800 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
807736f6 | 1801 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
712bbfe4 | 1802 | struct batadv_bla_claim *claim; |
56303d34 | 1803 | struct batadv_hard_iface *primary_if; |
9bf8e4d4 | 1804 | struct hlist_head *head; |
5a1dd8a4 | 1805 | u16 backbone_crc; |
6b5e971a | 1806 | u32 i; |
9bf8e4d4 | 1807 | bool is_own; |
6b5e971a | 1808 | u8 *primary_addr; |
9bf8e4d4 | 1809 | |
30da63a6 ML |
1810 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1811 | if (!primary_if) | |
9bf8e4d4 | 1812 | goto out; |
9bf8e4d4 | 1813 | |
1eda58bf | 1814 | primary_addr = primary_if->net_dev->dev_addr; |
38ef3d1d | 1815 | seq_printf(seq, |
39a32991 | 1816 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
1eda58bf | 1817 | net_dev->name, primary_addr, |
807736f6 | 1818 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1819 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
9bf8e4d4 SW |
1820 | "Client", "VID", "Originator", "CRC"); |
1821 | for (i = 0; i < hash->size; i++) { | |
1822 | head = &hash->table[i]; | |
1823 | ||
1824 | rcu_read_lock(); | |
b67bfe0d | 1825 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
1eda58bf SE |
1826 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
1827 | primary_addr); | |
5a1dd8a4 SW |
1828 | |
1829 | spin_lock_bh(&claim->backbone_gw->crc_lock); | |
1830 | backbone_crc = claim->backbone_gw->crc; | |
1831 | spin_unlock_bh(&claim->backbone_gw->crc_lock); | |
eb2deb6b | 1832 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
5f80df67 | 1833 | claim->addr, BATADV_PRINT_VID(claim->vid), |
9bf8e4d4 SW |
1834 | claim->backbone_gw->orig, |
1835 | (is_own ? 'x' : ' '), | |
5a1dd8a4 | 1836 | backbone_crc); |
9bf8e4d4 SW |
1837 | } |
1838 | rcu_read_unlock(); | |
1839 | } | |
1840 | out: | |
1841 | if (primary_if) | |
e5d89254 | 1842 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 1843 | return 0; |
9bf8e4d4 | 1844 | } |
536a23f1 | 1845 | |
04e14be6 SW |
1846 | /** |
1847 | * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq | |
1848 | * file | |
1849 | * @seq: seq file to print on | |
1850 | * @offset: not used | |
1851 | * | |
1852 | * Return: always 0 | |
1853 | */ | |
536a23f1 SW |
1854 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
1855 | { | |
1856 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1857 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
807736f6 | 1858 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
bae98774 | 1859 | struct batadv_bla_backbone_gw *backbone_gw; |
536a23f1 | 1860 | struct batadv_hard_iface *primary_if; |
536a23f1 SW |
1861 | struct hlist_head *head; |
1862 | int secs, msecs; | |
5a1dd8a4 | 1863 | u16 backbone_crc; |
6b5e971a | 1864 | u32 i; |
536a23f1 | 1865 | bool is_own; |
6b5e971a | 1866 | u8 *primary_addr; |
536a23f1 | 1867 | |
30da63a6 ML |
1868 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1869 | if (!primary_if) | |
536a23f1 | 1870 | goto out; |
536a23f1 SW |
1871 | |
1872 | primary_addr = primary_if->net_dev->dev_addr; | |
1873 | seq_printf(seq, | |
39a32991 | 1874 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
536a23f1 | 1875 | net_dev->name, primary_addr, |
807736f6 | 1876 | ntohs(bat_priv->bla.claim_dest.group)); |
39a32991 | 1877 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
536a23f1 SW |
1878 | "Originator", "VID", "last seen", "CRC"); |
1879 | for (i = 0; i < hash->size; i++) { | |
1880 | head = &hash->table[i]; | |
1881 | ||
1882 | rcu_read_lock(); | |
b67bfe0d | 1883 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
536a23f1 SW |
1884 | msecs = jiffies_to_msecs(jiffies - |
1885 | backbone_gw->lasttime); | |
1886 | secs = msecs / 1000; | |
1887 | msecs = msecs % 1000; | |
1888 | ||
1889 | is_own = batadv_compare_eth(backbone_gw->orig, | |
1890 | primary_addr); | |
1891 | if (is_own) | |
1892 | continue; | |
1893 | ||
5a1dd8a4 SW |
1894 | spin_lock_bh(&backbone_gw->crc_lock); |
1895 | backbone_crc = backbone_gw->crc; | |
1896 | spin_unlock_bh(&backbone_gw->crc_lock); | |
1897 | ||
eb2deb6b | 1898 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
5f80df67 AQ |
1899 | backbone_gw->orig, |
1900 | BATADV_PRINT_VID(backbone_gw->vid), secs, | |
5a1dd8a4 | 1901 | msecs, backbone_crc); |
536a23f1 SW |
1902 | } |
1903 | rcu_read_unlock(); | |
1904 | } | |
1905 | out: | |
1906 | if (primary_if) | |
1907 | batadv_hardif_free_ref(primary_if); | |
30da63a6 | 1908 | return 0; |
536a23f1 | 1909 | } |