| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors: |
| 3 | * |
| 4 | * Simon Wunderlich |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of version 2 of the GNU General Public |
| 8 | * License as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include "bridge_loop_avoidance.h" |
| 20 | #include "main.h" |
| 21 | |
| 22 | #include <linux/atomic.h> |
| 23 | #include <linux/byteorder/generic.h> |
| 24 | #include <linux/compiler.h> |
| 25 | #include <linux/crc16.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/etherdevice.h> |
| 28 | #include <linux/gfp.h> |
| 29 | #include <linux/if_arp.h> |
| 30 | #include <linux/if_ether.h> |
| 31 | #include <linux/if_vlan.h> |
| 32 | #include <linux/jhash.h> |
| 33 | #include <linux/jiffies.h> |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/kref.h> |
| 36 | #include <linux/list.h> |
| 37 | #include <linux/lockdep.h> |
| 38 | #include <linux/netdevice.h> |
| 39 | #include <linux/netlink.h> |
| 40 | #include <linux/rculist.h> |
| 41 | #include <linux/rcupdate.h> |
| 42 | #include <linux/seq_file.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | #include <linux/slab.h> |
| 45 | #include <linux/spinlock.h> |
| 46 | #include <linux/stddef.h> |
| 47 | #include <linux/string.h> |
| 48 | #include <linux/workqueue.h> |
| 49 | #include <net/arp.h> |
| 50 | #include <net/genetlink.h> |
| 51 | #include <net/netlink.h> |
| 52 | #include <net/sock.h> |
| 53 | #include <uapi/linux/batadv_packet.h> |
| 54 | #include <uapi/linux/batman_adv.h> |
| 55 | |
| 56 | #include "hard-interface.h" |
| 57 | #include "hash.h" |
| 58 | #include "log.h" |
| 59 | #include "netlink.h" |
| 60 | #include "originator.h" |
| 61 | #include "soft-interface.h" |
| 62 | #include "sysfs.h" |
| 63 | #include "translation-table.h" |
| 64 | |
| 65 | static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
| 66 | |
| 67 | static void batadv_bla_periodic_work(struct work_struct *work); |
| 68 | static void |
| 69 | batadv_bla_send_announce(struct batadv_priv *bat_priv, |
| 70 | struct batadv_bla_backbone_gw *backbone_gw); |
| 71 | |
| 72 | /** |
| 73 | * batadv_choose_claim() - choose the right bucket for a claim. |
| 74 | * @data: data to hash |
| 75 | * @size: size of the hash table |
| 76 | * |
| 77 | * Return: the hash index of the claim |
| 78 | */ |
| 79 | static inline u32 batadv_choose_claim(const void *data, u32 size) |
| 80 | { |
| 81 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
| 82 | u32 hash = 0; |
| 83 | |
| 84 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
| 85 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); |
| 86 | |
| 87 | return hash % size; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. |
| 92 | * @data: data to hash |
| 93 | * @size: size of the hash table |
| 94 | * |
| 95 | * Return: the hash index of the backbone gateway |
| 96 | */ |
| 97 | static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) |
| 98 | { |
| 99 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
| 100 | u32 hash = 0; |
| 101 | |
| 102 | hash = jhash(&claim->addr, sizeof(claim->addr), hash); |
| 103 | hash = jhash(&claim->vid, sizeof(claim->vid), hash); |
| 104 | |
| 105 | return hash % size; |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * batadv_compare_backbone_gw() - compare address and vid of two backbone gws |
| 110 | * @node: list node of the first entry to compare |
| 111 | * @data2: pointer to the second backbone gateway |
| 112 | * |
| 113 | * Return: true if the backbones have the same data, false otherwise |
| 114 | */ |
| 115 | static bool batadv_compare_backbone_gw(const struct hlist_node *node, |
| 116 | const void *data2) |
| 117 | { |
| 118 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
| 119 | hash_entry); |
| 120 | const struct batadv_bla_backbone_gw *gw1 = data1; |
| 121 | const struct batadv_bla_backbone_gw *gw2 = data2; |
| 122 | |
| 123 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
| 124 | return false; |
| 125 | |
| 126 | if (gw1->vid != gw2->vid) |
| 127 | return false; |
| 128 | |
| 129 | return true; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * batadv_compare_claim() - compare address and vid of two claims |
| 134 | * @node: list node of the first entry to compare |
| 135 | * @data2: pointer to the second claims |
| 136 | * |
| 137 | * Return: true if the claim have the same data, 0 otherwise |
| 138 | */ |
| 139 | static bool batadv_compare_claim(const struct hlist_node *node, |
| 140 | const void *data2) |
| 141 | { |
| 142 | const void *data1 = container_of(node, struct batadv_bla_claim, |
| 143 | hash_entry); |
| 144 | const struct batadv_bla_claim *cl1 = data1; |
| 145 | const struct batadv_bla_claim *cl2 = data2; |
| 146 | |
| 147 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) |
| 148 | return false; |
| 149 | |
| 150 | if (cl1->vid != cl2->vid) |
| 151 | return false; |
| 152 | |
| 153 | return true; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * batadv_backbone_gw_release() - release backbone gw from lists and queue for |
| 158 | * free after rcu grace period |
| 159 | * @ref: kref pointer of the backbone gw |
| 160 | */ |
| 161 | static void batadv_backbone_gw_release(struct kref *ref) |
| 162 | { |
| 163 | struct batadv_bla_backbone_gw *backbone_gw; |
| 164 | |
| 165 | backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, |
| 166 | refcount); |
| 167 | |
| 168 | kfree_rcu(backbone_gw, rcu); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly |
| 173 | * release it |
| 174 | * @backbone_gw: backbone gateway to be free'd |
| 175 | */ |
| 176 | static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) |
| 177 | { |
| 178 | kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * batadv_claim_release() - release claim from lists and queue for free after |
| 183 | * rcu grace period |
| 184 | * @ref: kref pointer of the claim |
| 185 | */ |
| 186 | static void batadv_claim_release(struct kref *ref) |
| 187 | { |
| 188 | struct batadv_bla_claim *claim; |
| 189 | struct batadv_bla_backbone_gw *old_backbone_gw; |
| 190 | |
| 191 | claim = container_of(ref, struct batadv_bla_claim, refcount); |
| 192 | |
| 193 | spin_lock_bh(&claim->backbone_lock); |
| 194 | old_backbone_gw = claim->backbone_gw; |
| 195 | claim->backbone_gw = NULL; |
| 196 | spin_unlock_bh(&claim->backbone_lock); |
| 197 | |
| 198 | spin_lock_bh(&old_backbone_gw->crc_lock); |
| 199 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
| 200 | spin_unlock_bh(&old_backbone_gw->crc_lock); |
| 201 | |
| 202 | batadv_backbone_gw_put(old_backbone_gw); |
| 203 | |
| 204 | kfree_rcu(claim, rcu); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * batadv_claim_put() - decrement the claim refcounter and possibly release it |
| 209 | * @claim: claim to be free'd |
| 210 | */ |
| 211 | static void batadv_claim_put(struct batadv_bla_claim *claim) |
| 212 | { |
| 213 | kref_put(&claim->refcount, batadv_claim_release); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * batadv_claim_hash_find() - looks for a claim in the claim hash |
| 218 | * @bat_priv: the bat priv with all the soft interface information |
| 219 | * @data: search data (may be local/static data) |
| 220 | * |
| 221 | * Return: claim if found or NULL otherwise. |
| 222 | */ |
| 223 | static struct batadv_bla_claim * |
| 224 | batadv_claim_hash_find(struct batadv_priv *bat_priv, |
| 225 | struct batadv_bla_claim *data) |
| 226 | { |
| 227 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
| 228 | struct hlist_head *head; |
| 229 | struct batadv_bla_claim *claim; |
| 230 | struct batadv_bla_claim *claim_tmp = NULL; |
| 231 | int index; |
| 232 | |
| 233 | if (!hash) |
| 234 | return NULL; |
| 235 | |
| 236 | index = batadv_choose_claim(data, hash->size); |
| 237 | head = &hash->table[index]; |
| 238 | |
| 239 | rcu_read_lock(); |
| 240 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| 241 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
| 242 | continue; |
| 243 | |
| 244 | if (!kref_get_unless_zero(&claim->refcount)) |
| 245 | continue; |
| 246 | |
| 247 | claim_tmp = claim; |
| 248 | break; |
| 249 | } |
| 250 | rcu_read_unlock(); |
| 251 | |
| 252 | return claim_tmp; |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * batadv_backbone_hash_find() - looks for a backbone gateway in the hash |
| 257 | * @bat_priv: the bat priv with all the soft interface information |
| 258 | * @addr: the address of the originator |
| 259 | * @vid: the VLAN ID |
| 260 | * |
| 261 | * Return: backbone gateway if found or NULL otherwise |
| 262 | */ |
| 263 | static struct batadv_bla_backbone_gw * |
| 264 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, |
| 265 | unsigned short vid) |
| 266 | { |
| 267 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
| 268 | struct hlist_head *head; |
| 269 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
| 270 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; |
| 271 | int index; |
| 272 | |
| 273 | if (!hash) |
| 274 | return NULL; |
| 275 | |
| 276 | ether_addr_copy(search_entry.orig, addr); |
| 277 | search_entry.vid = vid; |
| 278 | |
| 279 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
| 280 | head = &hash->table[index]; |
| 281 | |
| 282 | rcu_read_lock(); |
| 283 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 284 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
| 285 | &search_entry)) |
| 286 | continue; |
| 287 | |
| 288 | if (!kref_get_unless_zero(&backbone_gw->refcount)) |
| 289 | continue; |
| 290 | |
| 291 | backbone_gw_tmp = backbone_gw; |
| 292 | break; |
| 293 | } |
| 294 | rcu_read_unlock(); |
| 295 | |
| 296 | return backbone_gw_tmp; |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * batadv_bla_del_backbone_claims() - delete all claims for a backbone |
| 301 | * @backbone_gw: backbone gateway where the claims should be removed |
| 302 | */ |
| 303 | static void |
| 304 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
| 305 | { |
| 306 | struct batadv_hashtable *hash; |
| 307 | struct hlist_node *node_tmp; |
| 308 | struct hlist_head *head; |
| 309 | struct batadv_bla_claim *claim; |
| 310 | int i; |
| 311 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 312 | |
| 313 | hash = backbone_gw->bat_priv->bla.claim_hash; |
| 314 | if (!hash) |
| 315 | return; |
| 316 | |
| 317 | for (i = 0; i < hash->size; i++) { |
| 318 | head = &hash->table[i]; |
| 319 | list_lock = &hash->list_locks[i]; |
| 320 | |
| 321 | spin_lock_bh(list_lock); |
| 322 | hlist_for_each_entry_safe(claim, node_tmp, |
| 323 | head, hash_entry) { |
| 324 | if (claim->backbone_gw != backbone_gw) |
| 325 | continue; |
| 326 | |
| 327 | batadv_claim_put(claim); |
| 328 | hlist_del_rcu(&claim->hash_entry); |
| 329 | } |
| 330 | spin_unlock_bh(list_lock); |
| 331 | } |
| 332 | |
| 333 | /* all claims gone, initialize CRC */ |
| 334 | spin_lock_bh(&backbone_gw->crc_lock); |
| 335 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
| 336 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * batadv_bla_send_claim() - sends a claim frame according to the provided info |
| 341 | * @bat_priv: the bat priv with all the soft interface information |
| 342 | * @mac: the mac address to be announced within the claim |
| 343 | * @vid: the VLAN ID |
| 344 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) |
| 345 | */ |
| 346 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, |
| 347 | unsigned short vid, int claimtype) |
| 348 | { |
| 349 | struct sk_buff *skb; |
| 350 | struct ethhdr *ethhdr; |
| 351 | struct batadv_hard_iface *primary_if; |
| 352 | struct net_device *soft_iface; |
| 353 | u8 *hw_src; |
| 354 | struct batadv_bla_claim_dst local_claim_dest; |
| 355 | __be32 zeroip = 0; |
| 356 | |
| 357 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 358 | if (!primary_if) |
| 359 | return; |
| 360 | |
| 361 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
| 362 | sizeof(local_claim_dest)); |
| 363 | local_claim_dest.type = claimtype; |
| 364 | |
| 365 | soft_iface = primary_if->soft_iface; |
| 366 | |
| 367 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
| 368 | /* IP DST: 0.0.0.0 */ |
| 369 | zeroip, |
| 370 | primary_if->soft_iface, |
| 371 | /* IP SRC: 0.0.0.0 */ |
| 372 | zeroip, |
| 373 | /* Ethernet DST: Broadcast */ |
| 374 | NULL, |
| 375 | /* Ethernet SRC/HW SRC: originator mac */ |
| 376 | primary_if->net_dev->dev_addr, |
| 377 | /* HW DST: FF:43:05:XX:YY:YY |
| 378 | * with XX = claim type |
| 379 | * and YY:YY = group id |
| 380 | */ |
| 381 | (u8 *)&local_claim_dest); |
| 382 | |
| 383 | if (!skb) |
| 384 | goto out; |
| 385 | |
| 386 | ethhdr = (struct ethhdr *)skb->data; |
| 387 | hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
| 388 | |
| 389 | /* now we pretend that the client would have sent this ... */ |
| 390 | switch (claimtype) { |
| 391 | case BATADV_CLAIM_TYPE_CLAIM: |
| 392 | /* normal claim frame |
| 393 | * set Ethernet SRC to the clients mac |
| 394 | */ |
| 395 | ether_addr_copy(ethhdr->h_source, mac); |
| 396 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 397 | "%s(): CLAIM %pM on vid %d\n", __func__, mac, |
| 398 | batadv_print_vid(vid)); |
| 399 | break; |
| 400 | case BATADV_CLAIM_TYPE_UNCLAIM: |
| 401 | /* unclaim frame |
| 402 | * set HW SRC to the clients mac |
| 403 | */ |
| 404 | ether_addr_copy(hw_src, mac); |
| 405 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 406 | "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, |
| 407 | batadv_print_vid(vid)); |
| 408 | break; |
| 409 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
| 410 | /* announcement frame |
| 411 | * set HW SRC to the special mac containg the crc |
| 412 | */ |
| 413 | ether_addr_copy(hw_src, mac); |
| 414 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 415 | "%s(): ANNOUNCE of %pM on vid %d\n", __func__, |
| 416 | ethhdr->h_source, batadv_print_vid(vid)); |
| 417 | break; |
| 418 | case BATADV_CLAIM_TYPE_REQUEST: |
| 419 | /* request frame |
| 420 | * set HW SRC and header destination to the receiving backbone |
| 421 | * gws mac |
| 422 | */ |
| 423 | ether_addr_copy(hw_src, mac); |
| 424 | ether_addr_copy(ethhdr->h_dest, mac); |
| 425 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 426 | "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, |
| 427 | ethhdr->h_source, ethhdr->h_dest, |
| 428 | batadv_print_vid(vid)); |
| 429 | break; |
| 430 | case BATADV_CLAIM_TYPE_LOOPDETECT: |
| 431 | ether_addr_copy(ethhdr->h_source, mac); |
| 432 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 433 | "%s(): LOOPDETECT of %pM to %pM on vid %d\n", |
| 434 | __func__, ethhdr->h_source, ethhdr->h_dest, |
| 435 | batadv_print_vid(vid)); |
| 436 | |
| 437 | break; |
| 438 | } |
| 439 | |
| 440 | if (vid & BATADV_VLAN_HAS_TAG) { |
| 441 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
| 442 | vid & VLAN_VID_MASK); |
| 443 | if (!skb) |
| 444 | goto out; |
| 445 | } |
| 446 | |
| 447 | skb_reset_mac_header(skb); |
| 448 | skb->protocol = eth_type_trans(skb, soft_iface); |
| 449 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
| 450 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
| 451 | skb->len + ETH_HLEN); |
| 452 | |
| 453 | netif_rx(skb); |
| 454 | out: |
| 455 | if (primary_if) |
| 456 | batadv_hardif_put(primary_if); |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * batadv_bla_loopdetect_report() - worker for reporting the loop |
| 461 | * @work: work queue item |
| 462 | * |
| 463 | * Throws an uevent, as the loopdetect check function can't do that itself |
| 464 | * since the kernel may sleep while throwing uevents. |
| 465 | */ |
| 466 | static void batadv_bla_loopdetect_report(struct work_struct *work) |
| 467 | { |
| 468 | struct batadv_bla_backbone_gw *backbone_gw; |
| 469 | struct batadv_priv *bat_priv; |
| 470 | char vid_str[6] = { '\0' }; |
| 471 | |
| 472 | backbone_gw = container_of(work, struct batadv_bla_backbone_gw, |
| 473 | report_work); |
| 474 | bat_priv = backbone_gw->bat_priv; |
| 475 | |
| 476 | batadv_info(bat_priv->soft_iface, |
| 477 | "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", |
| 478 | batadv_print_vid(backbone_gw->vid)); |
| 479 | snprintf(vid_str, sizeof(vid_str), "%d", |
| 480 | batadv_print_vid(backbone_gw->vid)); |
| 481 | vid_str[sizeof(vid_str) - 1] = 0; |
| 482 | |
| 483 | batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, |
| 484 | vid_str); |
| 485 | |
| 486 | batadv_backbone_gw_put(backbone_gw); |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway |
| 491 | * @bat_priv: the bat priv with all the soft interface information |
| 492 | * @orig: the mac address of the originator |
| 493 | * @vid: the VLAN ID |
| 494 | * @own_backbone: set if the requested backbone is local |
| 495 | * |
| 496 | * Return: the (possibly created) backbone gateway or NULL on error |
| 497 | */ |
| 498 | static struct batadv_bla_backbone_gw * |
| 499 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, |
| 500 | unsigned short vid, bool own_backbone) |
| 501 | { |
| 502 | struct batadv_bla_backbone_gw *entry; |
| 503 | struct batadv_orig_node *orig_node; |
| 504 | int hash_added; |
| 505 | |
| 506 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
| 507 | |
| 508 | if (entry) |
| 509 | return entry; |
| 510 | |
| 511 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 512 | "%s(): not found (%pM, %d), creating new entry\n", __func__, |
| 513 | orig, batadv_print_vid(vid)); |
| 514 | |
| 515 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 516 | if (!entry) |
| 517 | return NULL; |
| 518 | |
| 519 | entry->vid = vid; |
| 520 | entry->lasttime = jiffies; |
| 521 | entry->crc = BATADV_BLA_CRC_INIT; |
| 522 | entry->bat_priv = bat_priv; |
| 523 | spin_lock_init(&entry->crc_lock); |
| 524 | atomic_set(&entry->request_sent, 0); |
| 525 | atomic_set(&entry->wait_periods, 0); |
| 526 | ether_addr_copy(entry->orig, orig); |
| 527 | INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); |
| 528 | kref_init(&entry->refcount); |
| 529 | |
| 530 | kref_get(&entry->refcount); |
| 531 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
| 532 | batadv_compare_backbone_gw, |
| 533 | batadv_choose_backbone_gw, entry, |
| 534 | &entry->hash_entry); |
| 535 | |
| 536 | if (unlikely(hash_added != 0)) { |
| 537 | /* hash failed, free the structure */ |
| 538 | kfree(entry); |
| 539 | return NULL; |
| 540 | } |
| 541 | |
| 542 | /* this is a gateway now, remove any TT entry on this VLAN */ |
| 543 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
| 544 | if (orig_node) { |
| 545 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
| 546 | "became a backbone gateway"); |
| 547 | batadv_orig_node_put(orig_node); |
| 548 | } |
| 549 | |
| 550 | if (own_backbone) { |
| 551 | batadv_bla_send_announce(bat_priv, entry); |
| 552 | |
| 553 | /* this will be decreased in the worker thread */ |
| 554 | atomic_inc(&entry->request_sent); |
| 555 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
| 556 | atomic_inc(&bat_priv->bla.num_requests); |
| 557 | } |
| 558 | |
| 559 | return entry; |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN |
| 564 | * @bat_priv: the bat priv with all the soft interface information |
| 565 | * @primary_if: the selected primary interface |
| 566 | * @vid: VLAN identifier |
| 567 | * |
| 568 | * update or add the own backbone gw to make sure we announce |
| 569 | * where we receive other backbone gws |
| 570 | */ |
| 571 | static void |
| 572 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, |
| 573 | struct batadv_hard_iface *primary_if, |
| 574 | unsigned short vid) |
| 575 | { |
| 576 | struct batadv_bla_backbone_gw *backbone_gw; |
| 577 | |
| 578 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
| 579 | primary_if->net_dev->dev_addr, |
| 580 | vid, true); |
| 581 | if (unlikely(!backbone_gw)) |
| 582 | return; |
| 583 | |
| 584 | backbone_gw->lasttime = jiffies; |
| 585 | batadv_backbone_gw_put(backbone_gw); |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * batadv_bla_answer_request() - answer a bla request by sending own claims |
| 590 | * @bat_priv: the bat priv with all the soft interface information |
| 591 | * @primary_if: interface where the request came on |
| 592 | * @vid: the vid where the request came on |
| 593 | * |
| 594 | * Repeat all of our own claims, and finally send an ANNOUNCE frame |
| 595 | * to allow the requester another check if the CRC is correct now. |
| 596 | */ |
| 597 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
| 598 | struct batadv_hard_iface *primary_if, |
| 599 | unsigned short vid) |
| 600 | { |
| 601 | struct hlist_head *head; |
| 602 | struct batadv_hashtable *hash; |
| 603 | struct batadv_bla_claim *claim; |
| 604 | struct batadv_bla_backbone_gw *backbone_gw; |
| 605 | int i; |
| 606 | |
| 607 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 608 | "%s(): received a claim request, send all of our own claims again\n", |
| 609 | __func__); |
| 610 | |
| 611 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
| 612 | primary_if->net_dev->dev_addr, |
| 613 | vid); |
| 614 | if (!backbone_gw) |
| 615 | return; |
| 616 | |
| 617 | hash = bat_priv->bla.claim_hash; |
| 618 | for (i = 0; i < hash->size; i++) { |
| 619 | head = &hash->table[i]; |
| 620 | |
| 621 | rcu_read_lock(); |
| 622 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| 623 | /* only own claims are interesting */ |
| 624 | if (claim->backbone_gw != backbone_gw) |
| 625 | continue; |
| 626 | |
| 627 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
| 628 | BATADV_CLAIM_TYPE_CLAIM); |
| 629 | } |
| 630 | rcu_read_unlock(); |
| 631 | } |
| 632 | |
| 633 | /* finally, send an announcement frame */ |
| 634 | batadv_bla_send_announce(bat_priv, backbone_gw); |
| 635 | batadv_backbone_gw_put(backbone_gw); |
| 636 | } |
| 637 | |
| 638 | /** |
| 639 | * batadv_bla_send_request() - send a request to repeat claims |
| 640 | * @backbone_gw: the backbone gateway from whom we are out of sync |
| 641 | * |
| 642 | * When the crc is wrong, ask the backbone gateway for a full table update. |
| 643 | * After the request, it will repeat all of his own claims and finally |
| 644 | * send an announcement claim with which we can check again. |
| 645 | */ |
| 646 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
| 647 | { |
| 648 | /* first, remove all old entries */ |
| 649 | batadv_bla_del_backbone_claims(backbone_gw); |
| 650 | |
| 651 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
| 652 | "Sending REQUEST to %pM\n", backbone_gw->orig); |
| 653 | |
| 654 | /* send request */ |
| 655 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
| 656 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
| 657 | |
| 658 | /* no local broadcasts should be sent or received, for now. */ |
| 659 | if (!atomic_read(&backbone_gw->request_sent)) { |
| 660 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
| 661 | atomic_set(&backbone_gw->request_sent, 1); |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * batadv_bla_send_announce() - Send an announcement frame |
| 667 | * @bat_priv: the bat priv with all the soft interface information |
| 668 | * @backbone_gw: our backbone gateway which should be announced |
| 669 | */ |
| 670 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
| 671 | struct batadv_bla_backbone_gw *backbone_gw) |
| 672 | { |
| 673 | u8 mac[ETH_ALEN]; |
| 674 | __be16 crc; |
| 675 | |
| 676 | memcpy(mac, batadv_announce_mac, 4); |
| 677 | spin_lock_bh(&backbone_gw->crc_lock); |
| 678 | crc = htons(backbone_gw->crc); |
| 679 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 680 | memcpy(&mac[4], &crc, 2); |
| 681 | |
| 682 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
| 683 | BATADV_CLAIM_TYPE_ANNOUNCE); |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * batadv_bla_add_claim() - Adds a claim in the claim hash |
| 688 | * @bat_priv: the bat priv with all the soft interface information |
| 689 | * @mac: the mac address of the claim |
| 690 | * @vid: the VLAN ID of the frame |
| 691 | * @backbone_gw: the backbone gateway which claims it |
| 692 | */ |
| 693 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
| 694 | const u8 *mac, const unsigned short vid, |
| 695 | struct batadv_bla_backbone_gw *backbone_gw) |
| 696 | { |
| 697 | struct batadv_bla_backbone_gw *old_backbone_gw; |
| 698 | struct batadv_bla_claim *claim; |
| 699 | struct batadv_bla_claim search_claim; |
| 700 | bool remove_crc = false; |
| 701 | int hash_added; |
| 702 | |
| 703 | ether_addr_copy(search_claim.addr, mac); |
| 704 | search_claim.vid = vid; |
| 705 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
| 706 | |
| 707 | /* create a new claim entry if it does not exist yet. */ |
| 708 | if (!claim) { |
| 709 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); |
| 710 | if (!claim) |
| 711 | return; |
| 712 | |
| 713 | ether_addr_copy(claim->addr, mac); |
| 714 | spin_lock_init(&claim->backbone_lock); |
| 715 | claim->vid = vid; |
| 716 | claim->lasttime = jiffies; |
| 717 | kref_get(&backbone_gw->refcount); |
| 718 | claim->backbone_gw = backbone_gw; |
| 719 | kref_init(&claim->refcount); |
| 720 | |
| 721 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 722 | "%s(): adding new entry %pM, vid %d to hash ...\n", |
| 723 | __func__, mac, batadv_print_vid(vid)); |
| 724 | |
| 725 | kref_get(&claim->refcount); |
| 726 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
| 727 | batadv_compare_claim, |
| 728 | batadv_choose_claim, claim, |
| 729 | &claim->hash_entry); |
| 730 | |
| 731 | if (unlikely(hash_added != 0)) { |
| 732 | /* only local changes happened. */ |
| 733 | kfree(claim); |
| 734 | return; |
| 735 | } |
| 736 | } else { |
| 737 | claim->lasttime = jiffies; |
| 738 | if (claim->backbone_gw == backbone_gw) |
| 739 | /* no need to register a new backbone */ |
| 740 | goto claim_free_ref; |
| 741 | |
| 742 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 743 | "%s(): changing ownership for %pM, vid %d to gw %pM\n", |
| 744 | __func__, mac, batadv_print_vid(vid), |
| 745 | backbone_gw->orig); |
| 746 | |
| 747 | remove_crc = true; |
| 748 | } |
| 749 | |
| 750 | /* replace backbone_gw atomically and adjust reference counters */ |
| 751 | spin_lock_bh(&claim->backbone_lock); |
| 752 | old_backbone_gw = claim->backbone_gw; |
| 753 | kref_get(&backbone_gw->refcount); |
| 754 | claim->backbone_gw = backbone_gw; |
| 755 | spin_unlock_bh(&claim->backbone_lock); |
| 756 | |
| 757 | if (remove_crc) { |
| 758 | /* remove claim address from old backbone_gw */ |
| 759 | spin_lock_bh(&old_backbone_gw->crc_lock); |
| 760 | old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
| 761 | spin_unlock_bh(&old_backbone_gw->crc_lock); |
| 762 | } |
| 763 | |
| 764 | batadv_backbone_gw_put(old_backbone_gw); |
| 765 | |
| 766 | /* add claim address to new backbone_gw */ |
| 767 | spin_lock_bh(&backbone_gw->crc_lock); |
| 768 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
| 769 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 770 | backbone_gw->lasttime = jiffies; |
| 771 | |
| 772 | claim_free_ref: |
| 773 | batadv_claim_put(claim); |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of |
| 778 | * claim |
| 779 | * @claim: claim whose backbone_gw should be returned |
| 780 | * |
| 781 | * Return: valid reference to claim::backbone_gw |
| 782 | */ |
| 783 | static struct batadv_bla_backbone_gw * |
| 784 | batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) |
| 785 | { |
| 786 | struct batadv_bla_backbone_gw *backbone_gw; |
| 787 | |
| 788 | spin_lock_bh(&claim->backbone_lock); |
| 789 | backbone_gw = claim->backbone_gw; |
| 790 | kref_get(&backbone_gw->refcount); |
| 791 | spin_unlock_bh(&claim->backbone_lock); |
| 792 | |
| 793 | return backbone_gw; |
| 794 | } |
| 795 | |
| 796 | /** |
| 797 | * batadv_bla_del_claim() - delete a claim from the claim hash |
| 798 | * @bat_priv: the bat priv with all the soft interface information |
| 799 | * @mac: mac address of the claim to be removed |
| 800 | * @vid: VLAN id for the claim to be removed |
| 801 | */ |
| 802 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
| 803 | const u8 *mac, const unsigned short vid) |
| 804 | { |
| 805 | struct batadv_bla_claim search_claim, *claim; |
| 806 | |
| 807 | ether_addr_copy(search_claim.addr, mac); |
| 808 | search_claim.vid = vid; |
| 809 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
| 810 | if (!claim) |
| 811 | return; |
| 812 | |
| 813 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, |
| 814 | mac, batadv_print_vid(vid)); |
| 815 | |
| 816 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
| 817 | batadv_choose_claim, claim); |
| 818 | batadv_claim_put(claim); /* reference from the hash is gone */ |
| 819 | |
| 820 | /* don't need the reference from hash_find() anymore */ |
| 821 | batadv_claim_put(claim); |
| 822 | } |
| 823 | |
| 824 | /** |
| 825 | * batadv_handle_announce() - check for ANNOUNCE frame |
| 826 | * @bat_priv: the bat priv with all the soft interface information |
| 827 | * @an_addr: announcement mac address (ARP Sender HW address) |
| 828 | * @backbone_addr: originator address of the sender (Ethernet source MAC) |
| 829 | * @vid: the VLAN ID of the frame |
| 830 | * |
| 831 | * Return: true if handled |
| 832 | */ |
| 833 | static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, |
| 834 | u8 *backbone_addr, unsigned short vid) |
| 835 | { |
| 836 | struct batadv_bla_backbone_gw *backbone_gw; |
| 837 | u16 backbone_crc, crc; |
| 838 | |
| 839 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
| 840 | return false; |
| 841 | |
| 842 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
| 843 | false); |
| 844 | |
| 845 | if (unlikely(!backbone_gw)) |
| 846 | return true; |
| 847 | |
| 848 | /* handle as ANNOUNCE frame */ |
| 849 | backbone_gw->lasttime = jiffies; |
| 850 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
| 851 | |
| 852 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 853 | "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
| 854 | __func__, batadv_print_vid(vid), backbone_gw->orig, crc); |
| 855 | |
| 856 | spin_lock_bh(&backbone_gw->crc_lock); |
| 857 | backbone_crc = backbone_gw->crc; |
| 858 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 859 | |
| 860 | if (backbone_crc != crc) { |
| 861 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
| 862 | "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
| 863 | __func__, backbone_gw->orig, |
| 864 | batadv_print_vid(backbone_gw->vid), |
| 865 | backbone_crc, crc); |
| 866 | |
| 867 | batadv_bla_send_request(backbone_gw); |
| 868 | } else { |
| 869 | /* if we have sent a request and the crc was OK, |
| 870 | * we can allow traffic again. |
| 871 | */ |
| 872 | if (atomic_read(&backbone_gw->request_sent)) { |
| 873 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
| 874 | atomic_set(&backbone_gw->request_sent, 0); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | batadv_backbone_gw_put(backbone_gw); |
| 879 | return true; |
| 880 | } |
| 881 | |
| 882 | /** |
| 883 | * batadv_handle_request() - check for REQUEST frame |
| 884 | * @bat_priv: the bat priv with all the soft interface information |
| 885 | * @primary_if: the primary hard interface of this batman soft interface |
| 886 | * @backbone_addr: backbone address to be requested (ARP sender HW MAC) |
| 887 | * @ethhdr: ethernet header of a packet |
| 888 | * @vid: the VLAN ID of the frame |
| 889 | * |
| 890 | * Return: true if handled |
| 891 | */ |
| 892 | static bool batadv_handle_request(struct batadv_priv *bat_priv, |
| 893 | struct batadv_hard_iface *primary_if, |
| 894 | u8 *backbone_addr, struct ethhdr *ethhdr, |
| 895 | unsigned short vid) |
| 896 | { |
| 897 | /* check for REQUEST frame */ |
| 898 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
| 899 | return false; |
| 900 | |
| 901 | /* sanity check, this should not happen on a normal switch, |
| 902 | * we ignore it in this case. |
| 903 | */ |
| 904 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
| 905 | return true; |
| 906 | |
| 907 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 908 | "%s(): REQUEST vid %d (sent by %pM)...\n", |
| 909 | __func__, batadv_print_vid(vid), ethhdr->h_source); |
| 910 | |
| 911 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
| 912 | return true; |
| 913 | } |
| 914 | |
| 915 | /** |
| 916 | * batadv_handle_unclaim() - check for UNCLAIM frame |
| 917 | * @bat_priv: the bat priv with all the soft interface information |
| 918 | * @primary_if: the primary hard interface of this batman soft interface |
| 919 | * @backbone_addr: originator address of the backbone (Ethernet source) |
| 920 | * @claim_addr: Client to be unclaimed (ARP sender HW MAC) |
| 921 | * @vid: the VLAN ID of the frame |
| 922 | * |
| 923 | * Return: true if handled |
| 924 | */ |
| 925 | static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, |
| 926 | struct batadv_hard_iface *primary_if, |
| 927 | u8 *backbone_addr, u8 *claim_addr, |
| 928 | unsigned short vid) |
| 929 | { |
| 930 | struct batadv_bla_backbone_gw *backbone_gw; |
| 931 | |
| 932 | /* unclaim in any case if it is our own */ |
| 933 | if (primary_if && batadv_compare_eth(backbone_addr, |
| 934 | primary_if->net_dev->dev_addr)) |
| 935 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
| 936 | BATADV_CLAIM_TYPE_UNCLAIM); |
| 937 | |
| 938 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
| 939 | |
| 940 | if (!backbone_gw) |
| 941 | return true; |
| 942 | |
| 943 | /* this must be an UNCLAIM frame */ |
| 944 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 945 | "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, |
| 946 | claim_addr, batadv_print_vid(vid), backbone_gw->orig); |
| 947 | |
| 948 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
| 949 | batadv_backbone_gw_put(backbone_gw); |
| 950 | return true; |
| 951 | } |
| 952 | |
| 953 | /** |
| 954 | * batadv_handle_claim() - check for CLAIM frame |
| 955 | * @bat_priv: the bat priv with all the soft interface information |
| 956 | * @primary_if: the primary hard interface of this batman soft interface |
| 957 | * @backbone_addr: originator address of the backbone (Ethernet Source) |
| 958 | * @claim_addr: client mac address to be claimed (ARP sender HW MAC) |
| 959 | * @vid: the VLAN ID of the frame |
| 960 | * |
| 961 | * Return: true if handled |
| 962 | */ |
| 963 | static bool batadv_handle_claim(struct batadv_priv *bat_priv, |
| 964 | struct batadv_hard_iface *primary_if, |
| 965 | u8 *backbone_addr, u8 *claim_addr, |
| 966 | unsigned short vid) |
| 967 | { |
| 968 | struct batadv_bla_backbone_gw *backbone_gw; |
| 969 | |
| 970 | /* register the gateway if not yet available, and add the claim. */ |
| 971 | |
| 972 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
| 973 | false); |
| 974 | |
| 975 | if (unlikely(!backbone_gw)) |
| 976 | return true; |
| 977 | |
| 978 | /* this must be a CLAIM frame */ |
| 979 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
| 980 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
| 981 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
| 982 | BATADV_CLAIM_TYPE_CLAIM); |
| 983 | |
| 984 | /* TODO: we could call something like tt_local_del() here. */ |
| 985 | |
| 986 | batadv_backbone_gw_put(backbone_gw); |
| 987 | return true; |
| 988 | } |
| 989 | |
| 990 | /** |
| 991 | * batadv_check_claim_group() - check for claim group membership |
| 992 | * @bat_priv: the bat priv with all the soft interface information |
| 993 | * @primary_if: the primary interface of this batman interface |
| 994 | * @hw_src: the Hardware source in the ARP Header |
| 995 | * @hw_dst: the Hardware destination in the ARP Header |
| 996 | * @ethhdr: pointer to the Ethernet header of the claim frame |
| 997 | * |
| 998 | * checks if it is a claim packet and if its on the same group. |
| 999 | * This function also applies the group ID of the sender |
| 1000 | * if it is in the same mesh. |
| 1001 | * |
| 1002 | * Return: |
| 1003 | * 2 - if it is a claim packet and on the same group |
| 1004 | * 1 - if is a claim packet from another group |
| 1005 | * 0 - if it is not a claim packet |
| 1006 | */ |
| 1007 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
| 1008 | struct batadv_hard_iface *primary_if, |
| 1009 | u8 *hw_src, u8 *hw_dst, |
| 1010 | struct ethhdr *ethhdr) |
| 1011 | { |
| 1012 | u8 *backbone_addr; |
| 1013 | struct batadv_orig_node *orig_node; |
| 1014 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
| 1015 | |
| 1016 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
| 1017 | bla_dst_own = &bat_priv->bla.claim_dest; |
| 1018 | |
| 1019 | /* if announcement packet, use the source, |
| 1020 | * otherwise assume it is in the hw_src |
| 1021 | */ |
| 1022 | switch (bla_dst->type) { |
| 1023 | case BATADV_CLAIM_TYPE_CLAIM: |
| 1024 | backbone_addr = hw_src; |
| 1025 | break; |
| 1026 | case BATADV_CLAIM_TYPE_REQUEST: |
| 1027 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
| 1028 | case BATADV_CLAIM_TYPE_UNCLAIM: |
| 1029 | backbone_addr = ethhdr->h_source; |
| 1030 | break; |
| 1031 | default: |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
| 1035 | /* don't accept claim frames from ourselves */ |
| 1036 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
| 1037 | return 0; |
| 1038 | |
| 1039 | /* if its already the same group, it is fine. */ |
| 1040 | if (bla_dst->group == bla_dst_own->group) |
| 1041 | return 2; |
| 1042 | |
| 1043 | /* lets see if this originator is in our mesh */ |
| 1044 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
| 1045 | |
| 1046 | /* dont accept claims from gateways which are not in |
| 1047 | * the same mesh or group. |
| 1048 | */ |
| 1049 | if (!orig_node) |
| 1050 | return 1; |
| 1051 | |
| 1052 | /* if our mesh friends mac is bigger, use it for ourselves. */ |
| 1053 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { |
| 1054 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1055 | "taking other backbones claim group: %#.4x\n", |
| 1056 | ntohs(bla_dst->group)); |
| 1057 | bla_dst_own->group = bla_dst->group; |
| 1058 | } |
| 1059 | |
| 1060 | batadv_orig_node_put(orig_node); |
| 1061 | |
| 1062 | return 2; |
| 1063 | } |
| 1064 | |
| 1065 | /** |
| 1066 | * batadv_bla_process_claim() - Check if this is a claim frame, and process it |
| 1067 | * @bat_priv: the bat priv with all the soft interface information |
| 1068 | * @primary_if: the primary hard interface of this batman soft interface |
| 1069 | * @skb: the frame to be checked |
| 1070 | * |
| 1071 | * Return: true if it was a claim frame, otherwise return false to |
| 1072 | * tell the callee that it can use the frame on its own. |
| 1073 | */ |
| 1074 | static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, |
| 1075 | struct batadv_hard_iface *primary_if, |
| 1076 | struct sk_buff *skb) |
| 1077 | { |
| 1078 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
| 1079 | u8 *hw_src, *hw_dst; |
| 1080 | struct vlan_hdr *vhdr, vhdr_buf; |
| 1081 | struct ethhdr *ethhdr; |
| 1082 | struct arphdr *arphdr; |
| 1083 | unsigned short vid; |
| 1084 | int vlan_depth = 0; |
| 1085 | __be16 proto; |
| 1086 | int headlen; |
| 1087 | int ret; |
| 1088 | |
| 1089 | vid = batadv_get_vid(skb, 0); |
| 1090 | ethhdr = eth_hdr(skb); |
| 1091 | |
| 1092 | proto = ethhdr->h_proto; |
| 1093 | headlen = ETH_HLEN; |
| 1094 | if (vid & BATADV_VLAN_HAS_TAG) { |
| 1095 | /* Traverse the VLAN/Ethertypes. |
| 1096 | * |
| 1097 | * At this point it is known that the first protocol is a VLAN |
| 1098 | * header, so start checking at the encapsulated protocol. |
| 1099 | * |
| 1100 | * The depth of the VLAN headers is recorded to drop BLA claim |
| 1101 | * frames encapsulated into multiple VLAN headers (QinQ). |
| 1102 | */ |
| 1103 | do { |
| 1104 | vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, |
| 1105 | &vhdr_buf); |
| 1106 | if (!vhdr) |
| 1107 | return false; |
| 1108 | |
| 1109 | proto = vhdr->h_vlan_encapsulated_proto; |
| 1110 | headlen += VLAN_HLEN; |
| 1111 | vlan_depth++; |
| 1112 | } while (proto == htons(ETH_P_8021Q)); |
| 1113 | } |
| 1114 | |
| 1115 | if (proto != htons(ETH_P_ARP)) |
| 1116 | return false; /* not a claim frame */ |
| 1117 | |
| 1118 | /* this must be a ARP frame. check if it is a claim. */ |
| 1119 | |
| 1120 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) |
| 1121 | return false; |
| 1122 | |
| 1123 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ |
| 1124 | ethhdr = eth_hdr(skb); |
| 1125 | arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); |
| 1126 | |
| 1127 | /* Check whether the ARP frame carries a valid |
| 1128 | * IP information |
| 1129 | */ |
| 1130 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
| 1131 | return false; |
| 1132 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
| 1133 | return false; |
| 1134 | if (arphdr->ar_hln != ETH_ALEN) |
| 1135 | return false; |
| 1136 | if (arphdr->ar_pln != 4) |
| 1137 | return false; |
| 1138 | |
| 1139 | hw_src = (u8 *)arphdr + sizeof(struct arphdr); |
| 1140 | hw_dst = hw_src + ETH_ALEN + 4; |
| 1141 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
| 1142 | bla_dst_own = &bat_priv->bla.claim_dest; |
| 1143 | |
| 1144 | /* check if it is a claim frame in general */ |
| 1145 | if (memcmp(bla_dst->magic, bla_dst_own->magic, |
| 1146 | sizeof(bla_dst->magic)) != 0) |
| 1147 | return false; |
| 1148 | |
| 1149 | /* check if there is a claim frame encapsulated deeper in (QinQ) and |
| 1150 | * drop that, as this is not supported by BLA but should also not be |
| 1151 | * sent via the mesh. |
| 1152 | */ |
| 1153 | if (vlan_depth > 1) |
| 1154 | return true; |
| 1155 | |
| 1156 | /* Let the loopdetect frames on the mesh in any case. */ |
| 1157 | if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) |
| 1158 | return false; |
| 1159 | |
| 1160 | /* check if it is a claim frame. */ |
| 1161 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
| 1162 | ethhdr); |
| 1163 | if (ret == 1) |
| 1164 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1165 | "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
| 1166 | __func__, ethhdr->h_source, batadv_print_vid(vid), |
| 1167 | hw_src, hw_dst); |
| 1168 | |
| 1169 | if (ret < 2) |
| 1170 | return !!ret; |
| 1171 | |
| 1172 | /* become a backbone gw ourselves on this vlan if not happened yet */ |
| 1173 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
| 1174 | |
| 1175 | /* check for the different types of claim frames ... */ |
| 1176 | switch (bla_dst->type) { |
| 1177 | case BATADV_CLAIM_TYPE_CLAIM: |
| 1178 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
| 1179 | ethhdr->h_source, vid)) |
| 1180 | return true; |
| 1181 | break; |
| 1182 | case BATADV_CLAIM_TYPE_UNCLAIM: |
| 1183 | if (batadv_handle_unclaim(bat_priv, primary_if, |
| 1184 | ethhdr->h_source, hw_src, vid)) |
| 1185 | return true; |
| 1186 | break; |
| 1187 | |
| 1188 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
| 1189 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
| 1190 | vid)) |
| 1191 | return true; |
| 1192 | break; |
| 1193 | case BATADV_CLAIM_TYPE_REQUEST: |
| 1194 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
| 1195 | vid)) |
| 1196 | return true; |
| 1197 | break; |
| 1198 | } |
| 1199 | |
| 1200 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1201 | "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
| 1202 | __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, |
| 1203 | hw_dst); |
| 1204 | return true; |
| 1205 | } |
| 1206 | |
| 1207 | /** |
| 1208 | * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or |
| 1209 | * immediately |
| 1210 | * @bat_priv: the bat priv with all the soft interface information |
| 1211 | * @now: whether the whole hash shall be wiped now |
| 1212 | * |
| 1213 | * Check when we last heard from other nodes, and remove them in case of |
| 1214 | * a time out, or clean all backbone gws if now is set. |
| 1215 | */ |
| 1216 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
| 1217 | { |
| 1218 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1219 | struct hlist_node *node_tmp; |
| 1220 | struct hlist_head *head; |
| 1221 | struct batadv_hashtable *hash; |
| 1222 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 1223 | int i; |
| 1224 | |
| 1225 | hash = bat_priv->bla.backbone_hash; |
| 1226 | if (!hash) |
| 1227 | return; |
| 1228 | |
| 1229 | for (i = 0; i < hash->size; i++) { |
| 1230 | head = &hash->table[i]; |
| 1231 | list_lock = &hash->list_locks[i]; |
| 1232 | |
| 1233 | spin_lock_bh(list_lock); |
| 1234 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
| 1235 | head, hash_entry) { |
| 1236 | if (now) |
| 1237 | goto purge_now; |
| 1238 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
| 1239 | BATADV_BLA_BACKBONE_TIMEOUT)) |
| 1240 | continue; |
| 1241 | |
| 1242 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
| 1243 | "%s(): backbone gw %pM timed out\n", |
| 1244 | __func__, backbone_gw->orig); |
| 1245 | |
| 1246 | purge_now: |
| 1247 | /* don't wait for the pending request anymore */ |
| 1248 | if (atomic_read(&backbone_gw->request_sent)) |
| 1249 | atomic_dec(&bat_priv->bla.num_requests); |
| 1250 | |
| 1251 | batadv_bla_del_backbone_claims(backbone_gw); |
| 1252 | |
| 1253 | hlist_del_rcu(&backbone_gw->hash_entry); |
| 1254 | batadv_backbone_gw_put(backbone_gw); |
| 1255 | } |
| 1256 | spin_unlock_bh(list_lock); |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | /** |
| 1261 | * batadv_bla_purge_claims() - Remove claims after a timeout or immediately |
| 1262 | * @bat_priv: the bat priv with all the soft interface information |
| 1263 | * @primary_if: the selected primary interface, may be NULL if now is set |
| 1264 | * @now: whether the whole hash shall be wiped now |
| 1265 | * |
| 1266 | * Check when we heard last time from our own claims, and remove them in case of |
| 1267 | * a time out, or clean all claims if now is set |
| 1268 | */ |
| 1269 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
| 1270 | struct batadv_hard_iface *primary_if, |
| 1271 | int now) |
| 1272 | { |
| 1273 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1274 | struct batadv_bla_claim *claim; |
| 1275 | struct hlist_head *head; |
| 1276 | struct batadv_hashtable *hash; |
| 1277 | int i; |
| 1278 | |
| 1279 | hash = bat_priv->bla.claim_hash; |
| 1280 | if (!hash) |
| 1281 | return; |
| 1282 | |
| 1283 | for (i = 0; i < hash->size; i++) { |
| 1284 | head = &hash->table[i]; |
| 1285 | |
| 1286 | rcu_read_lock(); |
| 1287 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| 1288 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
| 1289 | if (now) |
| 1290 | goto purge_now; |
| 1291 | |
| 1292 | if (!batadv_compare_eth(backbone_gw->orig, |
| 1293 | primary_if->net_dev->dev_addr)) |
| 1294 | goto skip; |
| 1295 | |
| 1296 | if (!batadv_has_timed_out(claim->lasttime, |
| 1297 | BATADV_BLA_CLAIM_TIMEOUT)) |
| 1298 | goto skip; |
| 1299 | |
| 1300 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1301 | "%s(): timed out.\n", __func__); |
| 1302 | |
| 1303 | purge_now: |
| 1304 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1305 | "%s(): %pM, vid %d\n", __func__, |
| 1306 | claim->addr, claim->vid); |
| 1307 | |
| 1308 | batadv_handle_unclaim(bat_priv, primary_if, |
| 1309 | backbone_gw->orig, |
| 1310 | claim->addr, claim->vid); |
| 1311 | skip: |
| 1312 | batadv_backbone_gw_put(backbone_gw); |
| 1313 | } |
| 1314 | rcu_read_unlock(); |
| 1315 | } |
| 1316 | } |
| 1317 | |
| 1318 | /** |
| 1319 | * batadv_bla_update_orig_address() - Update the backbone gateways when the own |
| 1320 | * originator address changes |
| 1321 | * @bat_priv: the bat priv with all the soft interface information |
| 1322 | * @primary_if: the new selected primary_if |
| 1323 | * @oldif: the old primary interface, may be NULL |
| 1324 | */ |
| 1325 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
| 1326 | struct batadv_hard_iface *primary_if, |
| 1327 | struct batadv_hard_iface *oldif) |
| 1328 | { |
| 1329 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1330 | struct hlist_head *head; |
| 1331 | struct batadv_hashtable *hash; |
| 1332 | __be16 group; |
| 1333 | int i; |
| 1334 | |
| 1335 | /* reset bridge loop avoidance group id */ |
| 1336 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
| 1337 | bat_priv->bla.claim_dest.group = group; |
| 1338 | |
| 1339 | /* purge everything when bridge loop avoidance is turned off */ |
| 1340 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1341 | oldif = NULL; |
| 1342 | |
| 1343 | if (!oldif) { |
| 1344 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
| 1345 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
| 1346 | return; |
| 1347 | } |
| 1348 | |
| 1349 | hash = bat_priv->bla.backbone_hash; |
| 1350 | if (!hash) |
| 1351 | return; |
| 1352 | |
| 1353 | for (i = 0; i < hash->size; i++) { |
| 1354 | head = &hash->table[i]; |
| 1355 | |
| 1356 | rcu_read_lock(); |
| 1357 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 1358 | /* own orig still holds the old value. */ |
| 1359 | if (!batadv_compare_eth(backbone_gw->orig, |
| 1360 | oldif->net_dev->dev_addr)) |
| 1361 | continue; |
| 1362 | |
| 1363 | ether_addr_copy(backbone_gw->orig, |
| 1364 | primary_if->net_dev->dev_addr); |
| 1365 | /* send an announce frame so others will ask for our |
| 1366 | * claims and update their tables. |
| 1367 | */ |
| 1368 | batadv_bla_send_announce(bat_priv, backbone_gw); |
| 1369 | } |
| 1370 | rcu_read_unlock(); |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | /** |
| 1375 | * batadv_bla_send_loopdetect() - send a loopdetect frame |
| 1376 | * @bat_priv: the bat priv with all the soft interface information |
| 1377 | * @backbone_gw: the backbone gateway for which a loop should be detected |
| 1378 | * |
| 1379 | * To detect loops that the bridge loop avoidance can't handle, send a loop |
| 1380 | * detection packet on the backbone. Unlike other BLA frames, this frame will |
| 1381 | * be allowed on the mesh by other nodes. If it is received on the mesh, this |
| 1382 | * indicates that there is a loop. |
| 1383 | */ |
| 1384 | static void |
| 1385 | batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, |
| 1386 | struct batadv_bla_backbone_gw *backbone_gw) |
| 1387 | { |
| 1388 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", |
| 1389 | backbone_gw->vid); |
| 1390 | batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, |
| 1391 | backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); |
| 1392 | } |
| 1393 | |
| 1394 | /** |
| 1395 | * batadv_bla_status_update() - purge bla interfaces if necessary |
| 1396 | * @net_dev: the soft interface net device |
| 1397 | */ |
| 1398 | void batadv_bla_status_update(struct net_device *net_dev) |
| 1399 | { |
| 1400 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 1401 | struct batadv_hard_iface *primary_if; |
| 1402 | |
| 1403 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1404 | if (!primary_if) |
| 1405 | return; |
| 1406 | |
| 1407 | /* this function already purges everything when bla is disabled, |
| 1408 | * so just call that one. |
| 1409 | */ |
| 1410 | batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); |
| 1411 | batadv_hardif_put(primary_if); |
| 1412 | } |
| 1413 | |
| 1414 | /** |
| 1415 | * batadv_bla_periodic_work() - performs periodic bla work |
| 1416 | * @work: kernel work struct |
| 1417 | * |
| 1418 | * periodic work to do: |
| 1419 | * * purge structures when they are too old |
| 1420 | * * send announcements |
| 1421 | */ |
| 1422 | static void batadv_bla_periodic_work(struct work_struct *work) |
| 1423 | { |
| 1424 | struct delayed_work *delayed_work; |
| 1425 | struct batadv_priv *bat_priv; |
| 1426 | struct batadv_priv_bla *priv_bla; |
| 1427 | struct hlist_head *head; |
| 1428 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1429 | struct batadv_hashtable *hash; |
| 1430 | struct batadv_hard_iface *primary_if; |
| 1431 | bool send_loopdetect = false; |
| 1432 | int i; |
| 1433 | |
| 1434 | delayed_work = to_delayed_work(work); |
| 1435 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
| 1436 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); |
| 1437 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1438 | if (!primary_if) |
| 1439 | goto out; |
| 1440 | |
| 1441 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
| 1442 | batadv_bla_purge_backbone_gw(bat_priv, 0); |
| 1443 | |
| 1444 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1445 | goto out; |
| 1446 | |
| 1447 | if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { |
| 1448 | /* set a new random mac address for the next bridge loop |
| 1449 | * detection frames. Set the locally administered bit to avoid |
| 1450 | * collisions with users mac addresses. |
| 1451 | */ |
| 1452 | eth_random_addr(bat_priv->bla.loopdetect_addr); |
| 1453 | bat_priv->bla.loopdetect_addr[0] = 0xba; |
| 1454 | bat_priv->bla.loopdetect_addr[1] = 0xbe; |
| 1455 | bat_priv->bla.loopdetect_lasttime = jiffies; |
| 1456 | atomic_set(&bat_priv->bla.loopdetect_next, |
| 1457 | BATADV_BLA_LOOPDETECT_PERIODS); |
| 1458 | |
| 1459 | /* mark for sending loop detect on all VLANs */ |
| 1460 | send_loopdetect = true; |
| 1461 | } |
| 1462 | |
| 1463 | hash = bat_priv->bla.backbone_hash; |
| 1464 | if (!hash) |
| 1465 | goto out; |
| 1466 | |
| 1467 | for (i = 0; i < hash->size; i++) { |
| 1468 | head = &hash->table[i]; |
| 1469 | |
| 1470 | rcu_read_lock(); |
| 1471 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 1472 | if (!batadv_compare_eth(backbone_gw->orig, |
| 1473 | primary_if->net_dev->dev_addr)) |
| 1474 | continue; |
| 1475 | |
| 1476 | backbone_gw->lasttime = jiffies; |
| 1477 | |
| 1478 | batadv_bla_send_announce(bat_priv, backbone_gw); |
| 1479 | if (send_loopdetect) |
| 1480 | batadv_bla_send_loopdetect(bat_priv, |
| 1481 | backbone_gw); |
| 1482 | |
| 1483 | /* request_sent is only set after creation to avoid |
| 1484 | * problems when we are not yet known as backbone gw |
| 1485 | * in the backbone. |
| 1486 | * |
| 1487 | * We can reset this now after we waited some periods |
| 1488 | * to give bridge forward delays and bla group forming |
| 1489 | * some grace time. |
| 1490 | */ |
| 1491 | |
| 1492 | if (atomic_read(&backbone_gw->request_sent) == 0) |
| 1493 | continue; |
| 1494 | |
| 1495 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
| 1496 | continue; |
| 1497 | |
| 1498 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
| 1499 | atomic_set(&backbone_gw->request_sent, 0); |
| 1500 | } |
| 1501 | rcu_read_unlock(); |
| 1502 | } |
| 1503 | out: |
| 1504 | if (primary_if) |
| 1505 | batadv_hardif_put(primary_if); |
| 1506 | |
| 1507 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
| 1508 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
| 1509 | } |
| 1510 | |
| 1511 | /* The hash for claim and backbone hash receive the same key because they |
| 1512 | * are getting initialized by hash_new with the same key. Reinitializing |
| 1513 | * them with to different keys to allow nested locking without generating |
| 1514 | * lockdep warnings |
| 1515 | */ |
| 1516 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
| 1517 | static struct lock_class_key batadv_backbone_hash_lock_class_key; |
| 1518 | |
| 1519 | /** |
| 1520 | * batadv_bla_init() - initialize all bla structures |
| 1521 | * @bat_priv: the bat priv with all the soft interface information |
| 1522 | * |
| 1523 | * Return: 0 on success, < 0 on error. |
| 1524 | */ |
| 1525 | int batadv_bla_init(struct batadv_priv *bat_priv) |
| 1526 | { |
| 1527 | int i; |
| 1528 | u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
| 1529 | struct batadv_hard_iface *primary_if; |
| 1530 | u16 crc; |
| 1531 | unsigned long entrytime; |
| 1532 | |
| 1533 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
| 1534 | |
| 1535 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
| 1536 | |
| 1537 | /* setting claim destination address */ |
| 1538 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
| 1539 | bat_priv->bla.claim_dest.type = 0; |
| 1540 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1541 | if (primary_if) { |
| 1542 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
| 1543 | bat_priv->bla.claim_dest.group = htons(crc); |
| 1544 | batadv_hardif_put(primary_if); |
| 1545 | } else { |
| 1546 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
| 1547 | } |
| 1548 | |
| 1549 | /* initialize the duplicate list */ |
| 1550 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
| 1551 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
| 1552 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
| 1553 | bat_priv->bla.bcast_duplist_curr = 0; |
| 1554 | |
| 1555 | atomic_set(&bat_priv->bla.loopdetect_next, |
| 1556 | BATADV_BLA_LOOPDETECT_PERIODS); |
| 1557 | |
| 1558 | if (bat_priv->bla.claim_hash) |
| 1559 | return 0; |
| 1560 | |
| 1561 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
| 1562 | bat_priv->bla.backbone_hash = batadv_hash_new(32); |
| 1563 | |
| 1564 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
| 1565 | return -ENOMEM; |
| 1566 | |
| 1567 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
| 1568 | &batadv_claim_hash_lock_class_key); |
| 1569 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
| 1570 | &batadv_backbone_hash_lock_class_key); |
| 1571 | |
| 1572 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
| 1573 | |
| 1574 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
| 1575 | |
| 1576 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
| 1577 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
| 1578 | return 0; |
| 1579 | } |
| 1580 | |
| 1581 | /** |
| 1582 | * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. |
| 1583 | * @bat_priv: the bat priv with all the soft interface information |
| 1584 | * @skb: contains the bcast_packet to be checked |
| 1585 | * |
| 1586 | * check if it is on our broadcast list. Another gateway might |
| 1587 | * have sent the same packet because it is connected to the same backbone, |
| 1588 | * so we have to remove this duplicate. |
| 1589 | * |
| 1590 | * This is performed by checking the CRC, which will tell us |
| 1591 | * with a good chance that it is the same packet. If it is furthermore |
| 1592 | * sent by another host, drop it. We allow equal packets from |
| 1593 | * the same host however as this might be intended. |
| 1594 | * |
| 1595 | * Return: true if a packet is in the duplicate list, false otherwise. |
| 1596 | */ |
| 1597 | bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
| 1598 | struct sk_buff *skb) |
| 1599 | { |
| 1600 | int i, curr; |
| 1601 | __be32 crc; |
| 1602 | struct batadv_bcast_packet *bcast_packet; |
| 1603 | struct batadv_bcast_duplist_entry *entry; |
| 1604 | bool ret = false; |
| 1605 | |
| 1606 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
| 1607 | |
| 1608 | /* calculate the crc ... */ |
| 1609 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
| 1610 | |
| 1611 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
| 1612 | |
| 1613 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
| 1614 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
| 1615 | curr %= BATADV_DUPLIST_SIZE; |
| 1616 | entry = &bat_priv->bla.bcast_duplist[curr]; |
| 1617 | |
| 1618 | /* we can stop searching if the entry is too old ; |
| 1619 | * later entries will be even older |
| 1620 | */ |
| 1621 | if (batadv_has_timed_out(entry->entrytime, |
| 1622 | BATADV_DUPLIST_TIMEOUT)) |
| 1623 | break; |
| 1624 | |
| 1625 | if (entry->crc != crc) |
| 1626 | continue; |
| 1627 | |
| 1628 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
| 1629 | continue; |
| 1630 | |
| 1631 | /* this entry seems to match: same crc, not too old, |
| 1632 | * and from another gw. therefore return true to forbid it. |
| 1633 | */ |
| 1634 | ret = true; |
| 1635 | goto out; |
| 1636 | } |
| 1637 | /* not found, add a new entry (overwrite the oldest entry) |
| 1638 | * and allow it, its the first occurrence. |
| 1639 | */ |
| 1640 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
| 1641 | curr %= BATADV_DUPLIST_SIZE; |
| 1642 | entry = &bat_priv->bla.bcast_duplist[curr]; |
| 1643 | entry->crc = crc; |
| 1644 | entry->entrytime = jiffies; |
| 1645 | ether_addr_copy(entry->orig, bcast_packet->orig); |
| 1646 | bat_priv->bla.bcast_duplist_curr = curr; |
| 1647 | |
| 1648 | out: |
| 1649 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); |
| 1650 | |
| 1651 | return ret; |
| 1652 | } |
| 1653 | |
| 1654 | /** |
| 1655 | * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for |
| 1656 | * the VLAN identified by vid. |
| 1657 | * @bat_priv: the bat priv with all the soft interface information |
| 1658 | * @orig: originator mac address |
| 1659 | * @vid: VLAN identifier |
| 1660 | * |
| 1661 | * Return: true if orig is a backbone for this vid, false otherwise. |
| 1662 | */ |
| 1663 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, |
| 1664 | unsigned short vid) |
| 1665 | { |
| 1666 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
| 1667 | struct hlist_head *head; |
| 1668 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1669 | int i; |
| 1670 | |
| 1671 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1672 | return false; |
| 1673 | |
| 1674 | if (!hash) |
| 1675 | return false; |
| 1676 | |
| 1677 | for (i = 0; i < hash->size; i++) { |
| 1678 | head = &hash->table[i]; |
| 1679 | |
| 1680 | rcu_read_lock(); |
| 1681 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 1682 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
| 1683 | backbone_gw->vid == vid) { |
| 1684 | rcu_read_unlock(); |
| 1685 | return true; |
| 1686 | } |
| 1687 | } |
| 1688 | rcu_read_unlock(); |
| 1689 | } |
| 1690 | |
| 1691 | return false; |
| 1692 | } |
| 1693 | |
| 1694 | /** |
| 1695 | * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN |
| 1696 | * @skb: the frame to be checked |
| 1697 | * @orig_node: the orig_node of the frame |
| 1698 | * @hdr_size: maximum length of the frame |
| 1699 | * |
| 1700 | * Return: true if the orig_node is also a gateway on the soft interface, |
| 1701 | * otherwise it returns false. |
| 1702 | */ |
| 1703 | bool batadv_bla_is_backbone_gw(struct sk_buff *skb, |
| 1704 | struct batadv_orig_node *orig_node, int hdr_size) |
| 1705 | { |
| 1706 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1707 | unsigned short vid; |
| 1708 | |
| 1709 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) |
| 1710 | return false; |
| 1711 | |
| 1712 | /* first, find out the vid. */ |
| 1713 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
| 1714 | return false; |
| 1715 | |
| 1716 | vid = batadv_get_vid(skb, hdr_size); |
| 1717 | |
| 1718 | /* see if this originator is a backbone gw for this VLAN */ |
| 1719 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
| 1720 | orig_node->orig, vid); |
| 1721 | if (!backbone_gw) |
| 1722 | return false; |
| 1723 | |
| 1724 | batadv_backbone_gw_put(backbone_gw); |
| 1725 | return true; |
| 1726 | } |
| 1727 | |
| 1728 | /** |
| 1729 | * batadv_bla_free() - free all bla structures |
| 1730 | * @bat_priv: the bat priv with all the soft interface information |
| 1731 | * |
| 1732 | * for softinterface free or module unload |
| 1733 | */ |
| 1734 | void batadv_bla_free(struct batadv_priv *bat_priv) |
| 1735 | { |
| 1736 | struct batadv_hard_iface *primary_if; |
| 1737 | |
| 1738 | cancel_delayed_work_sync(&bat_priv->bla.work); |
| 1739 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1740 | |
| 1741 | if (bat_priv->bla.claim_hash) { |
| 1742 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
| 1743 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
| 1744 | bat_priv->bla.claim_hash = NULL; |
| 1745 | } |
| 1746 | if (bat_priv->bla.backbone_hash) { |
| 1747 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
| 1748 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
| 1749 | bat_priv->bla.backbone_hash = NULL; |
| 1750 | } |
| 1751 | if (primary_if) |
| 1752 | batadv_hardif_put(primary_if); |
| 1753 | } |
| 1754 | |
| 1755 | /** |
| 1756 | * batadv_bla_loopdetect_check() - check and handle a detected loop |
| 1757 | * @bat_priv: the bat priv with all the soft interface information |
| 1758 | * @skb: the packet to check |
| 1759 | * @primary_if: interface where the request came on |
| 1760 | * @vid: the VLAN ID of the frame |
| 1761 | * |
| 1762 | * Checks if this packet is a loop detect frame which has been sent by us, |
| 1763 | * throw an uevent and log the event if that is the case. |
| 1764 | * |
| 1765 | * Return: true if it is a loop detect frame which is to be dropped, false |
| 1766 | * otherwise. |
| 1767 | */ |
| 1768 | static bool |
| 1769 | batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 1770 | struct batadv_hard_iface *primary_if, |
| 1771 | unsigned short vid) |
| 1772 | { |
| 1773 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1774 | struct ethhdr *ethhdr; |
| 1775 | |
| 1776 | ethhdr = eth_hdr(skb); |
| 1777 | |
| 1778 | /* Only check for the MAC address and skip more checks here for |
| 1779 | * performance reasons - this function is on the hotpath, after all. |
| 1780 | */ |
| 1781 | if (!batadv_compare_eth(ethhdr->h_source, |
| 1782 | bat_priv->bla.loopdetect_addr)) |
| 1783 | return false; |
| 1784 | |
| 1785 | /* If the packet came too late, don't forward it on the mesh |
| 1786 | * but don't consider that as loop. It might be a coincidence. |
| 1787 | */ |
| 1788 | if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, |
| 1789 | BATADV_BLA_LOOPDETECT_TIMEOUT)) |
| 1790 | return true; |
| 1791 | |
| 1792 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
| 1793 | primary_if->net_dev->dev_addr, |
| 1794 | vid, true); |
| 1795 | if (unlikely(!backbone_gw)) |
| 1796 | return true; |
| 1797 | |
| 1798 | queue_work(batadv_event_workqueue, &backbone_gw->report_work); |
| 1799 | /* backbone_gw is unreferenced in the report work function function */ |
| 1800 | |
| 1801 | return true; |
| 1802 | } |
| 1803 | |
| 1804 | /** |
| 1805 | * batadv_bla_rx() - check packets coming from the mesh. |
| 1806 | * @bat_priv: the bat priv with all the soft interface information |
| 1807 | * @skb: the frame to be checked |
| 1808 | * @vid: the VLAN ID of the frame |
| 1809 | * @is_bcast: the packet came in a broadcast packet type. |
| 1810 | * |
| 1811 | * batadv_bla_rx avoidance checks if: |
| 1812 | * * we have to race for a claim |
| 1813 | * * if the frame is allowed on the LAN |
| 1814 | * |
| 1815 | * in these cases, the skb is further handled by this function |
| 1816 | * |
| 1817 | * Return: true if handled, otherwise it returns false and the caller shall |
| 1818 | * further process the skb. |
| 1819 | */ |
| 1820 | bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 1821 | unsigned short vid, bool is_bcast) |
| 1822 | { |
| 1823 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1824 | struct ethhdr *ethhdr; |
| 1825 | struct batadv_bla_claim search_claim, *claim = NULL; |
| 1826 | struct batadv_hard_iface *primary_if; |
| 1827 | bool own_claim; |
| 1828 | bool ret; |
| 1829 | |
| 1830 | ethhdr = eth_hdr(skb); |
| 1831 | |
| 1832 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1833 | if (!primary_if) |
| 1834 | goto handled; |
| 1835 | |
| 1836 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1837 | goto allow; |
| 1838 | |
| 1839 | if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) |
| 1840 | goto handled; |
| 1841 | |
| 1842 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
| 1843 | /* don't allow broadcasts while requests are in flight */ |
| 1844 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
| 1845 | goto handled; |
| 1846 | |
| 1847 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
| 1848 | search_claim.vid = vid; |
| 1849 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
| 1850 | |
| 1851 | if (!claim) { |
| 1852 | /* possible optimization: race for a claim */ |
| 1853 | /* No claim exists yet, claim it for us! |
| 1854 | */ |
| 1855 | |
| 1856 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
| 1857 | "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", |
| 1858 | __func__, ethhdr->h_source, |
| 1859 | batadv_is_my_client(bat_priv, |
| 1860 | ethhdr->h_source, vid) ? |
| 1861 | "yes" : "no"); |
| 1862 | batadv_handle_claim(bat_priv, primary_if, |
| 1863 | primary_if->net_dev->dev_addr, |
| 1864 | ethhdr->h_source, vid); |
| 1865 | goto allow; |
| 1866 | } |
| 1867 | |
| 1868 | /* if it is our own claim ... */ |
| 1869 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
| 1870 | own_claim = batadv_compare_eth(backbone_gw->orig, |
| 1871 | primary_if->net_dev->dev_addr); |
| 1872 | batadv_backbone_gw_put(backbone_gw); |
| 1873 | |
| 1874 | if (own_claim) { |
| 1875 | /* ... allow it in any case */ |
| 1876 | claim->lasttime = jiffies; |
| 1877 | goto allow; |
| 1878 | } |
| 1879 | |
| 1880 | /* if it is a broadcast ... */ |
| 1881 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
| 1882 | /* ... drop it. the responsible gateway is in charge. |
| 1883 | * |
| 1884 | * We need to check is_bcast because with the gateway |
| 1885 | * feature, broadcasts (like DHCP requests) may be sent |
| 1886 | * using a unicast packet type. |
| 1887 | */ |
| 1888 | goto handled; |
| 1889 | } else { |
| 1890 | /* seems the client considers us as its best gateway. |
| 1891 | * send a claim and update the claim table |
| 1892 | * immediately. |
| 1893 | */ |
| 1894 | batadv_handle_claim(bat_priv, primary_if, |
| 1895 | primary_if->net_dev->dev_addr, |
| 1896 | ethhdr->h_source, vid); |
| 1897 | goto allow; |
| 1898 | } |
| 1899 | allow: |
| 1900 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
| 1901 | ret = false; |
| 1902 | goto out; |
| 1903 | |
| 1904 | handled: |
| 1905 | kfree_skb(skb); |
| 1906 | ret = true; |
| 1907 | |
| 1908 | out: |
| 1909 | if (primary_if) |
| 1910 | batadv_hardif_put(primary_if); |
| 1911 | if (claim) |
| 1912 | batadv_claim_put(claim); |
| 1913 | return ret; |
| 1914 | } |
| 1915 | |
| 1916 | /** |
| 1917 | * batadv_bla_tx() - check packets going into the mesh |
| 1918 | * @bat_priv: the bat priv with all the soft interface information |
| 1919 | * @skb: the frame to be checked |
| 1920 | * @vid: the VLAN ID of the frame |
| 1921 | * |
| 1922 | * batadv_bla_tx checks if: |
| 1923 | * * a claim was received which has to be processed |
| 1924 | * * the frame is allowed on the mesh |
| 1925 | * |
| 1926 | * in these cases, the skb is further handled by this function. |
| 1927 | * |
| 1928 | * This call might reallocate skb data. |
| 1929 | * |
| 1930 | * Return: true if handled, otherwise it returns false and the caller shall |
| 1931 | * further process the skb. |
| 1932 | */ |
| 1933 | bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 1934 | unsigned short vid) |
| 1935 | { |
| 1936 | struct ethhdr *ethhdr; |
| 1937 | struct batadv_bla_claim search_claim, *claim = NULL; |
| 1938 | struct batadv_bla_backbone_gw *backbone_gw; |
| 1939 | struct batadv_hard_iface *primary_if; |
| 1940 | bool client_roamed; |
| 1941 | bool ret = false; |
| 1942 | |
| 1943 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 1944 | if (!primary_if) |
| 1945 | goto out; |
| 1946 | |
| 1947 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1948 | goto allow; |
| 1949 | |
| 1950 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
| 1951 | goto handled; |
| 1952 | |
| 1953 | ethhdr = eth_hdr(skb); |
| 1954 | |
| 1955 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
| 1956 | /* don't allow broadcasts while requests are in flight */ |
| 1957 | if (is_multicast_ether_addr(ethhdr->h_dest)) |
| 1958 | goto handled; |
| 1959 | |
| 1960 | ether_addr_copy(search_claim.addr, ethhdr->h_source); |
| 1961 | search_claim.vid = vid; |
| 1962 | |
| 1963 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
| 1964 | |
| 1965 | /* if no claim exists, allow it. */ |
| 1966 | if (!claim) |
| 1967 | goto allow; |
| 1968 | |
| 1969 | /* check if we are responsible. */ |
| 1970 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
| 1971 | client_roamed = batadv_compare_eth(backbone_gw->orig, |
| 1972 | primary_if->net_dev->dev_addr); |
| 1973 | batadv_backbone_gw_put(backbone_gw); |
| 1974 | |
| 1975 | if (client_roamed) { |
| 1976 | /* if yes, the client has roamed and we have |
| 1977 | * to unclaim it. |
| 1978 | */ |
| 1979 | if (batadv_has_timed_out(claim->lasttime, 100)) { |
| 1980 | /* only unclaim if the last claim entry is |
| 1981 | * older than 100 ms to make sure we really |
| 1982 | * have a roaming client here. |
| 1983 | */ |
| 1984 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", |
| 1985 | __func__, ethhdr->h_source); |
| 1986 | batadv_handle_unclaim(bat_priv, primary_if, |
| 1987 | primary_if->net_dev->dev_addr, |
| 1988 | ethhdr->h_source, vid); |
| 1989 | goto allow; |
| 1990 | } else { |
| 1991 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", |
| 1992 | __func__, ethhdr->h_source); |
| 1993 | goto handled; |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | /* check if it is a multicast/broadcast frame */ |
| 1998 | if (is_multicast_ether_addr(ethhdr->h_dest)) { |
| 1999 | /* drop it. the responsible gateway has forwarded it into |
| 2000 | * the backbone network. |
| 2001 | */ |
| 2002 | goto handled; |
| 2003 | } else { |
| 2004 | /* we must allow it. at least if we are |
| 2005 | * responsible for the DESTINATION. |
| 2006 | */ |
| 2007 | goto allow; |
| 2008 | } |
| 2009 | allow: |
| 2010 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
| 2011 | ret = false; |
| 2012 | goto out; |
| 2013 | handled: |
| 2014 | ret = true; |
| 2015 | out: |
| 2016 | if (primary_if) |
| 2017 | batadv_hardif_put(primary_if); |
| 2018 | if (claim) |
| 2019 | batadv_claim_put(claim); |
| 2020 | return ret; |
| 2021 | } |
| 2022 | |
| 2023 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| 2024 | /** |
| 2025 | * batadv_bla_claim_table_seq_print_text() - print the claim table in a seq file |
| 2026 | * @seq: seq file to print on |
| 2027 | * @offset: not used |
| 2028 | * |
| 2029 | * Return: always 0 |
| 2030 | */ |
| 2031 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
| 2032 | { |
| 2033 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 2034 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 2035 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
| 2036 | struct batadv_bla_backbone_gw *backbone_gw; |
| 2037 | struct batadv_bla_claim *claim; |
| 2038 | struct batadv_hard_iface *primary_if; |
| 2039 | struct hlist_head *head; |
| 2040 | u16 backbone_crc; |
| 2041 | u32 i; |
| 2042 | bool is_own; |
| 2043 | u8 *primary_addr; |
| 2044 | |
| 2045 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 2046 | if (!primary_if) |
| 2047 | goto out; |
| 2048 | |
| 2049 | primary_addr = primary_if->net_dev->dev_addr; |
| 2050 | seq_printf(seq, |
| 2051 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
| 2052 | net_dev->name, primary_addr, |
| 2053 | ntohs(bat_priv->bla.claim_dest.group)); |
| 2054 | seq_puts(seq, |
| 2055 | " Client VID Originator [o] (CRC )\n"); |
| 2056 | for (i = 0; i < hash->size; i++) { |
| 2057 | head = &hash->table[i]; |
| 2058 | |
| 2059 | rcu_read_lock(); |
| 2060 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| 2061 | backbone_gw = batadv_bla_claim_get_backbone_gw(claim); |
| 2062 | |
| 2063 | is_own = batadv_compare_eth(backbone_gw->orig, |
| 2064 | primary_addr); |
| 2065 | |
| 2066 | spin_lock_bh(&backbone_gw->crc_lock); |
| 2067 | backbone_crc = backbone_gw->crc; |
| 2068 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 2069 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
| 2070 | claim->addr, batadv_print_vid(claim->vid), |
| 2071 | backbone_gw->orig, |
| 2072 | (is_own ? 'x' : ' '), |
| 2073 | backbone_crc); |
| 2074 | |
| 2075 | batadv_backbone_gw_put(backbone_gw); |
| 2076 | } |
| 2077 | rcu_read_unlock(); |
| 2078 | } |
| 2079 | out: |
| 2080 | if (primary_if) |
| 2081 | batadv_hardif_put(primary_if); |
| 2082 | return 0; |
| 2083 | } |
| 2084 | #endif |
| 2085 | |
| 2086 | /** |
| 2087 | * batadv_bla_claim_dump_entry() - dump one entry of the claim table |
| 2088 | * to a netlink socket |
| 2089 | * @msg: buffer for the message |
| 2090 | * @portid: netlink port |
| 2091 | * @seq: Sequence number of netlink message |
| 2092 | * @primary_if: primary interface |
| 2093 | * @claim: entry to dump |
| 2094 | * |
| 2095 | * Return: 0 or error code. |
| 2096 | */ |
| 2097 | static int |
| 2098 | batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| 2099 | struct batadv_hard_iface *primary_if, |
| 2100 | struct batadv_bla_claim *claim) |
| 2101 | { |
| 2102 | u8 *primary_addr = primary_if->net_dev->dev_addr; |
| 2103 | u16 backbone_crc; |
| 2104 | bool is_own; |
| 2105 | void *hdr; |
| 2106 | int ret = -EINVAL; |
| 2107 | |
| 2108 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| 2109 | NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM); |
| 2110 | if (!hdr) { |
| 2111 | ret = -ENOBUFS; |
| 2112 | goto out; |
| 2113 | } |
| 2114 | |
| 2115 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
| 2116 | primary_addr); |
| 2117 | |
| 2118 | spin_lock_bh(&claim->backbone_gw->crc_lock); |
| 2119 | backbone_crc = claim->backbone_gw->crc; |
| 2120 | spin_unlock_bh(&claim->backbone_gw->crc_lock); |
| 2121 | |
| 2122 | if (is_own) |
| 2123 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { |
| 2124 | genlmsg_cancel(msg, hdr); |
| 2125 | goto out; |
| 2126 | } |
| 2127 | |
| 2128 | if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || |
| 2129 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || |
| 2130 | nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, |
| 2131 | claim->backbone_gw->orig) || |
| 2132 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, |
| 2133 | backbone_crc)) { |
| 2134 | genlmsg_cancel(msg, hdr); |
| 2135 | goto out; |
| 2136 | } |
| 2137 | |
| 2138 | genlmsg_end(msg, hdr); |
| 2139 | ret = 0; |
| 2140 | |
| 2141 | out: |
| 2142 | return ret; |
| 2143 | } |
| 2144 | |
| 2145 | /** |
| 2146 | * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table |
| 2147 | * to a netlink socket |
| 2148 | * @msg: buffer for the message |
| 2149 | * @portid: netlink port |
| 2150 | * @seq: Sequence number of netlink message |
| 2151 | * @primary_if: primary interface |
| 2152 | * @head: bucket to dump |
| 2153 | * @idx_skip: How many entries to skip |
| 2154 | * |
| 2155 | * Return: always 0. |
| 2156 | */ |
| 2157 | static int |
| 2158 | batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, |
| 2159 | struct batadv_hard_iface *primary_if, |
| 2160 | struct hlist_head *head, int *idx_skip) |
| 2161 | { |
| 2162 | struct batadv_bla_claim *claim; |
| 2163 | int idx = 0; |
| 2164 | int ret = 0; |
| 2165 | |
| 2166 | rcu_read_lock(); |
| 2167 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
| 2168 | if (idx++ < *idx_skip) |
| 2169 | continue; |
| 2170 | |
| 2171 | ret = batadv_bla_claim_dump_entry(msg, portid, seq, |
| 2172 | primary_if, claim); |
| 2173 | if (ret) { |
| 2174 | *idx_skip = idx - 1; |
| 2175 | goto unlock; |
| 2176 | } |
| 2177 | } |
| 2178 | |
| 2179 | *idx_skip = 0; |
| 2180 | unlock: |
| 2181 | rcu_read_unlock(); |
| 2182 | return ret; |
| 2183 | } |
| 2184 | |
| 2185 | /** |
| 2186 | * batadv_bla_claim_dump() - dump claim table to a netlink socket |
| 2187 | * @msg: buffer for the message |
| 2188 | * @cb: callback structure containing arguments |
| 2189 | * |
| 2190 | * Return: message length. |
| 2191 | */ |
| 2192 | int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) |
| 2193 | { |
| 2194 | struct batadv_hard_iface *primary_if = NULL; |
| 2195 | int portid = NETLINK_CB(cb->skb).portid; |
| 2196 | struct net *net = sock_net(cb->skb->sk); |
| 2197 | struct net_device *soft_iface; |
| 2198 | struct batadv_hashtable *hash; |
| 2199 | struct batadv_priv *bat_priv; |
| 2200 | int bucket = cb->args[0]; |
| 2201 | struct hlist_head *head; |
| 2202 | int idx = cb->args[1]; |
| 2203 | int ifindex; |
| 2204 | int ret = 0; |
| 2205 | |
| 2206 | ifindex = batadv_netlink_get_ifindex(cb->nlh, |
| 2207 | BATADV_ATTR_MESH_IFINDEX); |
| 2208 | if (!ifindex) |
| 2209 | return -EINVAL; |
| 2210 | |
| 2211 | soft_iface = dev_get_by_index(net, ifindex); |
| 2212 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { |
| 2213 | ret = -ENODEV; |
| 2214 | goto out; |
| 2215 | } |
| 2216 | |
| 2217 | bat_priv = netdev_priv(soft_iface); |
| 2218 | hash = bat_priv->bla.claim_hash; |
| 2219 | |
| 2220 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 2221 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
| 2222 | ret = -ENOENT; |
| 2223 | goto out; |
| 2224 | } |
| 2225 | |
| 2226 | while (bucket < hash->size) { |
| 2227 | head = &hash->table[bucket]; |
| 2228 | |
| 2229 | if (batadv_bla_claim_dump_bucket(msg, portid, |
| 2230 | cb->nlh->nlmsg_seq, |
| 2231 | primary_if, head, &idx)) |
| 2232 | break; |
| 2233 | bucket++; |
| 2234 | } |
| 2235 | |
| 2236 | cb->args[0] = bucket; |
| 2237 | cb->args[1] = idx; |
| 2238 | |
| 2239 | ret = msg->len; |
| 2240 | |
| 2241 | out: |
| 2242 | if (primary_if) |
| 2243 | batadv_hardif_put(primary_if); |
| 2244 | |
| 2245 | if (soft_iface) |
| 2246 | dev_put(soft_iface); |
| 2247 | |
| 2248 | return ret; |
| 2249 | } |
| 2250 | |
| 2251 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
| 2252 | /** |
| 2253 | * batadv_bla_backbone_table_seq_print_text() - print the backbone table in a |
| 2254 | * seq file |
| 2255 | * @seq: seq file to print on |
| 2256 | * @offset: not used |
| 2257 | * |
| 2258 | * Return: always 0 |
| 2259 | */ |
| 2260 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
| 2261 | { |
| 2262 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 2263 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 2264 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
| 2265 | struct batadv_bla_backbone_gw *backbone_gw; |
| 2266 | struct batadv_hard_iface *primary_if; |
| 2267 | struct hlist_head *head; |
| 2268 | int secs, msecs; |
| 2269 | u16 backbone_crc; |
| 2270 | u32 i; |
| 2271 | bool is_own; |
| 2272 | u8 *primary_addr; |
| 2273 | |
| 2274 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 2275 | if (!primary_if) |
| 2276 | goto out; |
| 2277 | |
| 2278 | primary_addr = primary_if->net_dev->dev_addr; |
| 2279 | seq_printf(seq, |
| 2280 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
| 2281 | net_dev->name, primary_addr, |
| 2282 | ntohs(bat_priv->bla.claim_dest.group)); |
| 2283 | seq_puts(seq, " Originator VID last seen (CRC )\n"); |
| 2284 | for (i = 0; i < hash->size; i++) { |
| 2285 | head = &hash->table[i]; |
| 2286 | |
| 2287 | rcu_read_lock(); |
| 2288 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 2289 | msecs = jiffies_to_msecs(jiffies - |
| 2290 | backbone_gw->lasttime); |
| 2291 | secs = msecs / 1000; |
| 2292 | msecs = msecs % 1000; |
| 2293 | |
| 2294 | is_own = batadv_compare_eth(backbone_gw->orig, |
| 2295 | primary_addr); |
| 2296 | if (is_own) |
| 2297 | continue; |
| 2298 | |
| 2299 | spin_lock_bh(&backbone_gw->crc_lock); |
| 2300 | backbone_crc = backbone_gw->crc; |
| 2301 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 2302 | |
| 2303 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
| 2304 | backbone_gw->orig, |
| 2305 | batadv_print_vid(backbone_gw->vid), secs, |
| 2306 | msecs, backbone_crc); |
| 2307 | } |
| 2308 | rcu_read_unlock(); |
| 2309 | } |
| 2310 | out: |
| 2311 | if (primary_if) |
| 2312 | batadv_hardif_put(primary_if); |
| 2313 | return 0; |
| 2314 | } |
| 2315 | #endif |
| 2316 | |
| 2317 | /** |
| 2318 | * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a |
| 2319 | * netlink socket |
| 2320 | * @msg: buffer for the message |
| 2321 | * @portid: netlink port |
| 2322 | * @seq: Sequence number of netlink message |
| 2323 | * @primary_if: primary interface |
| 2324 | * @backbone_gw: entry to dump |
| 2325 | * |
| 2326 | * Return: 0 or error code. |
| 2327 | */ |
| 2328 | static int |
| 2329 | batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| 2330 | struct batadv_hard_iface *primary_if, |
| 2331 | struct batadv_bla_backbone_gw *backbone_gw) |
| 2332 | { |
| 2333 | u8 *primary_addr = primary_if->net_dev->dev_addr; |
| 2334 | u16 backbone_crc; |
| 2335 | bool is_own; |
| 2336 | int msecs; |
| 2337 | void *hdr; |
| 2338 | int ret = -EINVAL; |
| 2339 | |
| 2340 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| 2341 | NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE); |
| 2342 | if (!hdr) { |
| 2343 | ret = -ENOBUFS; |
| 2344 | goto out; |
| 2345 | } |
| 2346 | |
| 2347 | is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); |
| 2348 | |
| 2349 | spin_lock_bh(&backbone_gw->crc_lock); |
| 2350 | backbone_crc = backbone_gw->crc; |
| 2351 | spin_unlock_bh(&backbone_gw->crc_lock); |
| 2352 | |
| 2353 | msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); |
| 2354 | |
| 2355 | if (is_own) |
| 2356 | if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { |
| 2357 | genlmsg_cancel(msg, hdr); |
| 2358 | goto out; |
| 2359 | } |
| 2360 | |
| 2361 | if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, |
| 2362 | backbone_gw->orig) || |
| 2363 | nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || |
| 2364 | nla_put_u16(msg, BATADV_ATTR_BLA_CRC, |
| 2365 | backbone_crc) || |
| 2366 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { |
| 2367 | genlmsg_cancel(msg, hdr); |
| 2368 | goto out; |
| 2369 | } |
| 2370 | |
| 2371 | genlmsg_end(msg, hdr); |
| 2372 | ret = 0; |
| 2373 | |
| 2374 | out: |
| 2375 | return ret; |
| 2376 | } |
| 2377 | |
| 2378 | /** |
| 2379 | * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to |
| 2380 | * a netlink socket |
| 2381 | * @msg: buffer for the message |
| 2382 | * @portid: netlink port |
| 2383 | * @seq: Sequence number of netlink message |
| 2384 | * @primary_if: primary interface |
| 2385 | * @head: bucket to dump |
| 2386 | * @idx_skip: How many entries to skip |
| 2387 | * |
| 2388 | * Return: always 0. |
| 2389 | */ |
| 2390 | static int |
| 2391 | batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, |
| 2392 | struct batadv_hard_iface *primary_if, |
| 2393 | struct hlist_head *head, int *idx_skip) |
| 2394 | { |
| 2395 | struct batadv_bla_backbone_gw *backbone_gw; |
| 2396 | int idx = 0; |
| 2397 | int ret = 0; |
| 2398 | |
| 2399 | rcu_read_lock(); |
| 2400 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
| 2401 | if (idx++ < *idx_skip) |
| 2402 | continue; |
| 2403 | |
| 2404 | ret = batadv_bla_backbone_dump_entry(msg, portid, seq, |
| 2405 | primary_if, backbone_gw); |
| 2406 | if (ret) { |
| 2407 | *idx_skip = idx - 1; |
| 2408 | goto unlock; |
| 2409 | } |
| 2410 | } |
| 2411 | |
| 2412 | *idx_skip = 0; |
| 2413 | unlock: |
| 2414 | rcu_read_unlock(); |
| 2415 | return ret; |
| 2416 | } |
| 2417 | |
| 2418 | /** |
| 2419 | * batadv_bla_backbone_dump() - dump backbone table to a netlink socket |
| 2420 | * @msg: buffer for the message |
| 2421 | * @cb: callback structure containing arguments |
| 2422 | * |
| 2423 | * Return: message length. |
| 2424 | */ |
| 2425 | int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) |
| 2426 | { |
| 2427 | struct batadv_hard_iface *primary_if = NULL; |
| 2428 | int portid = NETLINK_CB(cb->skb).portid; |
| 2429 | struct net *net = sock_net(cb->skb->sk); |
| 2430 | struct net_device *soft_iface; |
| 2431 | struct batadv_hashtable *hash; |
| 2432 | struct batadv_priv *bat_priv; |
| 2433 | int bucket = cb->args[0]; |
| 2434 | struct hlist_head *head; |
| 2435 | int idx = cb->args[1]; |
| 2436 | int ifindex; |
| 2437 | int ret = 0; |
| 2438 | |
| 2439 | ifindex = batadv_netlink_get_ifindex(cb->nlh, |
| 2440 | BATADV_ATTR_MESH_IFINDEX); |
| 2441 | if (!ifindex) |
| 2442 | return -EINVAL; |
| 2443 | |
| 2444 | soft_iface = dev_get_by_index(net, ifindex); |
| 2445 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { |
| 2446 | ret = -ENODEV; |
| 2447 | goto out; |
| 2448 | } |
| 2449 | |
| 2450 | bat_priv = netdev_priv(soft_iface); |
| 2451 | hash = bat_priv->bla.backbone_hash; |
| 2452 | |
| 2453 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 2454 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
| 2455 | ret = -ENOENT; |
| 2456 | goto out; |
| 2457 | } |
| 2458 | |
| 2459 | while (bucket < hash->size) { |
| 2460 | head = &hash->table[bucket]; |
| 2461 | |
| 2462 | if (batadv_bla_backbone_dump_bucket(msg, portid, |
| 2463 | cb->nlh->nlmsg_seq, |
| 2464 | primary_if, head, &idx)) |
| 2465 | break; |
| 2466 | bucket++; |
| 2467 | } |
| 2468 | |
| 2469 | cb->args[0] = bucket; |
| 2470 | cb->args[1] = idx; |
| 2471 | |
| 2472 | ret = msg->len; |
| 2473 | |
| 2474 | out: |
| 2475 | if (primary_if) |
| 2476 | batadv_hardif_put(primary_if); |
| 2477 | |
| 2478 | if (soft_iface) |
| 2479 | dev_put(soft_iface); |
| 2480 | |
| 2481 | return ret; |
| 2482 | } |
| 2483 | |
| 2484 | #ifdef CONFIG_BATMAN_ADV_DAT |
| 2485 | /** |
| 2486 | * batadv_bla_check_claim() - check if address is claimed |
| 2487 | * |
| 2488 | * @bat_priv: the bat priv with all the soft interface information |
| 2489 | * @addr: mac address of which the claim status is checked |
| 2490 | * @vid: the VLAN ID |
| 2491 | * |
| 2492 | * addr is checked if this address is claimed by the local device itself. |
| 2493 | * |
| 2494 | * Return: true if bla is disabled or the mac is claimed by the device, |
| 2495 | * false if the device addr is already claimed by another gateway |
| 2496 | */ |
| 2497 | bool batadv_bla_check_claim(struct batadv_priv *bat_priv, |
| 2498 | u8 *addr, unsigned short vid) |
| 2499 | { |
| 2500 | struct batadv_bla_claim search_claim; |
| 2501 | struct batadv_bla_claim *claim = NULL; |
| 2502 | struct batadv_hard_iface *primary_if = NULL; |
| 2503 | bool ret = true; |
| 2504 | |
| 2505 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 2506 | return ret; |
| 2507 | |
| 2508 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 2509 | if (!primary_if) |
| 2510 | return ret; |
| 2511 | |
| 2512 | /* First look if the mac address is claimed */ |
| 2513 | ether_addr_copy(search_claim.addr, addr); |
| 2514 | search_claim.vid = vid; |
| 2515 | |
| 2516 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
| 2517 | |
| 2518 | /* If there is a claim and we are not owner of the claim, |
| 2519 | * return false. |
| 2520 | */ |
| 2521 | if (claim) { |
| 2522 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
| 2523 | primary_if->net_dev->dev_addr)) |
| 2524 | ret = false; |
| 2525 | batadv_claim_put(claim); |
| 2526 | } |
| 2527 | |
| 2528 | batadv_hardif_put(primary_if); |
| 2529 | return ret; |
| 2530 | } |
| 2531 | #endif |