1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner, Simon Wunderlich 5 */ 6 7 #include "main.h" 8 9 #include <linux/array_size.h> 10 #include <linux/atomic.h> 11 #include <linux/build_bug.h> 12 #include <linux/byteorder/generic.h> 13 #include <linux/container_of.h> 14 #include <linux/crc32.h> 15 #include <linux/device.h> 16 #include <linux/errno.h> 17 #include <linux/gfp.h> 18 #include <linux/if_ether.h> 19 #include <linux/if_vlan.h> 20 #include <linux/init.h> 21 #include <linux/ip.h> 22 #include <linux/ipv6.h> 23 #include <linux/kobject.h> 24 #include <linux/kref.h> 25 #include <linux/list.h> 26 #include <linux/minmax.h> 27 #include <linux/module.h> 28 #include <linux/netdevice.h> 29 #include <linux/printk.h> 30 #include <linux/rcupdate.h> 31 #include <linux/skbuff.h> 32 #include <linux/slab.h> 33 #include <linux/spinlock.h> 34 #include <linux/sprintf.h> 35 #include <linux/stddef.h> 36 #include <linux/string.h> 37 #include <linux/workqueue.h> 38 #include <net/dsfield.h> 39 #include <net/genetlink.h> 40 #include <net/rtnetlink.h> 41 #include <uapi/linux/batadv_packet.h> 42 #include <uapi/linux/batman_adv.h> 43 44 #include "bat_algo.h" 45 #include "bat_iv_ogm.h" 46 #include "bat_v.h" 47 #include "bridge_loop_avoidance.h" 48 #include "distributed-arp-table.h" 49 #include "gateway_client.h" 50 #include "gateway_common.h" 51 #include "hard-interface.h" 52 #include "log.h" 53 #include "mesh-interface.h" 54 #include "multicast.h" 55 #include "netlink.h" 56 #include "network-coding.h" 57 #include "originator.h" 58 #include "routing.h" 59 #include "send.h" 60 #include "tp_meter.h" 61 #include "translation-table.h" 62 63 /* List manipulations on hardif_list have to be rtnl_lock()'ed, 64 * list traversals just rcu-locked 65 */ 66 struct list_head batadv_hardif_list; 67 unsigned int batadv_hardif_generation; 68 static int (*batadv_rx_handler[256])(struct sk_buff *skb, 69 struct batadv_hard_iface *recv_if); 70 71 struct workqueue_struct *batadv_event_workqueue; 72 73 static void batadv_recv_handler_init(void); 74 75 #define BATADV_UEV_TYPE_VAR "BATTYPE=" 76 #define BATADV_UEV_ACTION_VAR "BATACTION=" 77 #define BATADV_UEV_DATA_VAR "BATDATA=" 78 79 static char *batadv_uev_action_str[] = { 80 "add", 81 "del", 82 "change", 83 "loopdetect", 84 }; 85 86 static char *batadv_uev_type_str[] = { 87 "gw", 88 "bla", 89 }; 90 91 static int __init batadv_init(void) 92 { 93 int ret; 94 95 ret = batadv_tt_cache_init(); 96 if (ret < 0) 97 return ret; 98 99 INIT_LIST_HEAD(&batadv_hardif_list); 100 batadv_algo_init(); 101 102 batadv_recv_handler_init(); 103 104 batadv_v_init(); 105 batadv_iv_init(); 106 batadv_nc_init(); 107 batadv_tp_meter_init(); 108 109 batadv_event_workqueue = create_singlethread_workqueue("bat_events"); 110 if (!batadv_event_workqueue) 111 goto err_create_wq; 112 113 register_netdevice_notifier(&batadv_hard_if_notifier); 114 rtnl_link_register(&batadv_link_ops); 115 batadv_netlink_register(); 116 117 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", 118 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); 119 120 return 0; 121 122 err_create_wq: 123 batadv_tt_cache_destroy(); 124 125 return -ENOMEM; 126 } 127 128 static void __exit batadv_exit(void) 129 { 130 batadv_netlink_unregister(); 131 rtnl_link_unregister(&batadv_link_ops); 132 unregister_netdevice_notifier(&batadv_hard_if_notifier); 133 134 destroy_workqueue(batadv_event_workqueue); 135 batadv_event_workqueue = NULL; 136 137 rcu_barrier(); 138 139 batadv_tt_cache_destroy(); 140 } 141 142 /** 143 * batadv_mesh_init() - Initialize mesh interface 144 * @mesh_iface: netdev struct of the mesh interface 145 * 146 * Return: 0 on success or negative error number in case of failure 147 */ 148 int batadv_mesh_init(struct net_device *mesh_iface) 149 { 150 struct batadv_priv *bat_priv = netdev_priv(mesh_iface); 151 int ret; 152 153 spin_lock_init(&bat_priv->forw_bat_list_lock); 154 spin_lock_init(&bat_priv->forw_bcast_list_lock); 155 spin_lock_init(&bat_priv->tt.changes_list_lock); 156 spin_lock_init(&bat_priv->tt.req_list_lock); 157 spin_lock_init(&bat_priv->tt.roam_list_lock); 158 spin_lock_init(&bat_priv->tt.last_changeset_lock); 159 spin_lock_init(&bat_priv->tt.commit_lock); 160 spin_lock_init(&bat_priv->gw.list_lock); 161 #ifdef CONFIG_BATMAN_ADV_MCAST 162 spin_lock_init(&bat_priv->mcast.mla_lock); 163 spin_lock_init(&bat_priv->mcast.want_lists_lock); 164 #endif 165 spin_lock_init(&bat_priv->tvlv.container_list_lock); 166 spin_lock_init(&bat_priv->tvlv.handler_list_lock); 167 spin_lock_init(&bat_priv->meshif_vlan_list_lock); 168 spin_lock_init(&bat_priv->tp_list_lock); 169 170 INIT_HLIST_HEAD(&bat_priv->forw_bat_list); 171 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); 172 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); 173 #ifdef CONFIG_BATMAN_ADV_MCAST 174 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); 175 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); 176 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); 177 #endif 178 INIT_LIST_HEAD(&bat_priv->tt.changes_list); 179 INIT_HLIST_HEAD(&bat_priv->tt.req_list); 180 INIT_LIST_HEAD(&bat_priv->tt.roam_list); 181 #ifdef CONFIG_BATMAN_ADV_MCAST 182 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); 183 #endif 184 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); 185 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); 186 INIT_HLIST_HEAD(&bat_priv->meshif_vlan_list); 187 INIT_HLIST_HEAD(&bat_priv->tp_list); 188 189 bat_priv->gw.generation = 0; 190 191 ret = batadv_originator_init(bat_priv); 192 if (ret < 0) { 193 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 194 goto err_orig; 195 } 196 197 ret = batadv_tt_init(bat_priv); 198 if (ret < 0) { 199 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 200 goto err_tt; 201 } 202 203 ret = batadv_v_mesh_init(bat_priv); 204 if (ret < 0) { 205 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 206 goto err_v; 207 } 208 209 ret = batadv_bla_init(bat_priv); 210 if (ret < 0) { 211 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 212 goto err_bla; 213 } 214 215 ret = batadv_dat_init(bat_priv); 216 if (ret < 0) { 217 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 218 goto err_dat; 219 } 220 221 ret = batadv_nc_mesh_init(bat_priv); 222 if (ret < 0) { 223 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 224 goto err_nc; 225 } 226 227 batadv_gw_init(bat_priv); 228 batadv_mcast_init(bat_priv); 229 230 atomic_set(&bat_priv->gw.reselect, 0); 231 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); 232 233 return 0; 234 235 err_nc: 236 batadv_dat_free(bat_priv); 237 err_dat: 238 batadv_bla_free(bat_priv); 239 err_bla: 240 batadv_v_mesh_free(bat_priv); 241 err_v: 242 batadv_tt_free(bat_priv); 243 err_tt: 244 batadv_originator_free(bat_priv); 245 err_orig: 246 batadv_purge_outstanding_packets(bat_priv, NULL); 247 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 248 249 return ret; 250 } 251 252 /** 253 * batadv_mesh_free() - Deinitialize mesh interface 254 * @mesh_iface: netdev struct of the mesh interface 255 */ 256 void batadv_mesh_free(struct net_device *mesh_iface) 257 { 258 struct batadv_priv *bat_priv = netdev_priv(mesh_iface); 259 260 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 261 262 batadv_purge_outstanding_packets(bat_priv, NULL); 263 264 batadv_gw_node_free(bat_priv); 265 266 batadv_v_mesh_free(bat_priv); 267 batadv_nc_mesh_free(bat_priv); 268 batadv_dat_free(bat_priv); 269 batadv_bla_free(bat_priv); 270 271 batadv_mcast_free(bat_priv); 272 273 /* Free the TT and the originator tables only after having terminated 274 * all the other depending components which may use these structures for 275 * their purposes. 276 */ 277 batadv_tt_free(bat_priv); 278 279 /* Since the originator table clean up routine is accessing the TT 280 * tables as well, it has to be invoked after the TT tables have been 281 * freed and marked as empty. This ensures that no cleanup RCU callbacks 282 * accessing the TT data are scheduled for later execution. 283 */ 284 batadv_originator_free(bat_priv); 285 286 batadv_gw_free(bat_priv); 287 288 free_percpu(bat_priv->bat_counters); 289 bat_priv->bat_counters = NULL; 290 291 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 292 } 293 294 /** 295 * batadv_is_my_mac() - check if the given mac address belongs to any of the 296 * real interfaces in the current mesh 297 * @bat_priv: the bat priv with all the mesh interface information 298 * @addr: the address to check 299 * 300 * Return: 'true' if the mac address was found, false otherwise. 301 */ 302 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) 303 { 304 const struct batadv_hard_iface *hard_iface; 305 struct list_head *iter; 306 bool is_my_mac = false; 307 308 rcu_read_lock(); 309 netdev_for_each_lower_private_rcu(bat_priv->mesh_iface, hard_iface, iter) { 310 if (hard_iface->if_status != BATADV_IF_ACTIVE) 311 continue; 312 313 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { 314 is_my_mac = true; 315 break; 316 } 317 } 318 rcu_read_unlock(); 319 return is_my_mac; 320 } 321 322 /** 323 * batadv_max_header_len() - calculate maximum encapsulation overhead for a 324 * payload packet 325 * 326 * Return: the maximum encapsulation overhead in bytes. 327 */ 328 int batadv_max_header_len(void) 329 { 330 int header_len = 0; 331 332 header_len = max_t(int, header_len, 333 sizeof(struct batadv_unicast_packet)); 334 header_len = max_t(int, header_len, 335 sizeof(struct batadv_unicast_4addr_packet)); 336 header_len = max_t(int, header_len, 337 sizeof(struct batadv_bcast_packet)); 338 339 #ifdef CONFIG_BATMAN_ADV_NC 340 header_len = max_t(int, header_len, 341 sizeof(struct batadv_coded_packet)); 342 #endif 343 344 return header_len + ETH_HLEN; 345 } 346 347 /** 348 * batadv_skb_set_priority() - sets skb priority according to packet content 349 * @skb: the packet to be sent 350 * @offset: offset to the packet content 351 * 352 * This function sets a value between 256 and 263 (802.1d priority), which 353 * can be interpreted by the cfg80211 or other drivers. 354 */ 355 void batadv_skb_set_priority(struct sk_buff *skb, int offset) 356 { 357 struct iphdr ip_hdr_tmp, *ip_hdr; 358 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; 359 struct ethhdr ethhdr_tmp, *ethhdr; 360 struct vlan_ethhdr *vhdr, vhdr_tmp; 361 u32 prio; 362 363 /* already set, do nothing */ 364 if (skb->priority >= 256 && skb->priority <= 263) 365 return; 366 367 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); 368 if (!ethhdr) 369 return; 370 371 switch (ethhdr->h_proto) { 372 case htons(ETH_P_8021Q): 373 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), 374 sizeof(*vhdr), &vhdr_tmp); 375 if (!vhdr) 376 return; 377 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; 378 prio = prio >> VLAN_PRIO_SHIFT; 379 break; 380 case htons(ETH_P_IP): 381 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), 382 sizeof(*ip_hdr), &ip_hdr_tmp); 383 if (!ip_hdr) 384 return; 385 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; 386 break; 387 case htons(ETH_P_IPV6): 388 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), 389 sizeof(*ip6_hdr), &ip6_hdr_tmp); 390 if (!ip6_hdr) 391 return; 392 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; 393 break; 394 default: 395 return; 396 } 397 398 skb->priority = prio + 256; 399 } 400 401 static int batadv_recv_unhandled_packet(struct sk_buff *skb, 402 struct batadv_hard_iface *recv_if) 403 { 404 kfree_skb(skb); 405 406 return NET_RX_DROP; 407 } 408 409 /* incoming packets with the batman ethertype received on any active hard 410 * interface 411 */ 412 413 /** 414 * batadv_batman_skb_recv() - Handle incoming message from an hard interface 415 * @skb: the received packet 416 * @dev: the net device that the packet was received on 417 * @ptype: packet type of incoming packet (ETH_P_BATMAN) 418 * @orig_dev: the original receive net device (e.g. bonded device) 419 * 420 * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure 421 */ 422 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, 423 struct packet_type *ptype, 424 struct net_device *orig_dev) 425 { 426 struct batadv_priv *bat_priv; 427 struct batadv_ogm_packet *batadv_ogm_packet; 428 struct batadv_hard_iface *hard_iface; 429 u8 idx; 430 431 hard_iface = container_of(ptype, struct batadv_hard_iface, 432 batman_adv_ptype); 433 434 /* Prevent processing a packet received on an interface which is getting 435 * shut down otherwise the packet may trigger de-reference errors 436 * further down in the receive path. 437 */ 438 if (!kref_get_unless_zero(&hard_iface->refcount)) 439 goto err_out; 440 441 skb = skb_share_check(skb, GFP_ATOMIC); 442 443 /* skb was released by skb_share_check() */ 444 if (!skb) 445 goto err_put; 446 447 /* packet should hold at least type and version */ 448 if (unlikely(!pskb_may_pull(skb, 2))) 449 goto err_free; 450 451 /* expect a valid ethernet header here. */ 452 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) 453 goto err_free; 454 455 if (!hard_iface->mesh_iface) 456 goto err_free; 457 458 bat_priv = netdev_priv(hard_iface->mesh_iface); 459 460 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 461 goto err_free; 462 463 /* discard frames on not active interfaces */ 464 if (hard_iface->if_status != BATADV_IF_ACTIVE) 465 goto err_free; 466 467 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; 468 469 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { 470 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 471 "Drop packet: incompatible batman version (%i)\n", 472 batadv_ogm_packet->version); 473 goto err_free; 474 } 475 476 /* reset control block to avoid left overs from previous users */ 477 memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); 478 479 idx = batadv_ogm_packet->packet_type; 480 (*batadv_rx_handler[idx])(skb, hard_iface); 481 482 batadv_hardif_put(hard_iface); 483 484 /* return NET_RX_SUCCESS in any case as we 485 * most probably dropped the packet for 486 * routing-logical reasons. 487 */ 488 return NET_RX_SUCCESS; 489 490 err_free: 491 kfree_skb(skb); 492 err_put: 493 batadv_hardif_put(hard_iface); 494 err_out: 495 return NET_RX_DROP; 496 } 497 498 static void batadv_recv_handler_init(void) 499 { 500 int i; 501 502 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) 503 batadv_rx_handler[i] = batadv_recv_unhandled_packet; 504 505 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) 506 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; 507 508 /* compile time checks for sizes */ 509 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); 510 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); 511 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); 512 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); 513 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); 514 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); 515 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); 516 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); 517 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); 518 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); 519 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); 520 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); 521 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); 522 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); 523 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); 524 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); 525 526 i = sizeof_field(struct sk_buff, cb); 527 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); 528 529 /* broadcast packet */ 530 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; 531 /* multicast packet */ 532 batadv_rx_handler[BATADV_MCAST] = batadv_recv_mcast_packet; 533 534 /* unicast packets ... */ 535 /* unicast with 4 addresses packet */ 536 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; 537 /* unicast packet */ 538 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; 539 /* unicast tvlv packet */ 540 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; 541 /* batman icmp packet */ 542 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; 543 /* Fragmented packets */ 544 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; 545 } 546 547 /** 548 * batadv_recv_handler_register() - Register handler for batman-adv packet type 549 * @packet_type: batadv_packettype which should be handled 550 * @recv_handler: receive handler for the packet type 551 * 552 * Return: 0 on success or negative error number in case of failure 553 */ 554 int 555 batadv_recv_handler_register(u8 packet_type, 556 int (*recv_handler)(struct sk_buff *, 557 struct batadv_hard_iface *)) 558 { 559 int (*curr)(struct sk_buff *skb, 560 struct batadv_hard_iface *recv_if); 561 curr = batadv_rx_handler[packet_type]; 562 563 if (curr != batadv_recv_unhandled_packet && 564 curr != batadv_recv_unhandled_unicast_packet) 565 return -EBUSY; 566 567 batadv_rx_handler[packet_type] = recv_handler; 568 return 0; 569 } 570 571 /** 572 * batadv_recv_handler_unregister() - Unregister handler for packet type 573 * @packet_type: batadv_packettype which should no longer be handled 574 */ 575 void batadv_recv_handler_unregister(u8 packet_type) 576 { 577 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; 578 } 579 580 /** 581 * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in 582 * the header 583 * @skb: skb pointing to fragmented socket buffers 584 * @payload_ptr: Pointer to position inside the head buffer of the skb 585 * marking the start of the data to be CRC'ed 586 * 587 * payload_ptr must always point to an address in the skb head buffer and not to 588 * a fragment. 589 * 590 * Return: big endian crc32c of the checksummed data 591 */ 592 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) 593 { 594 u32 crc = 0; 595 unsigned int from; 596 unsigned int to = skb->len; 597 struct skb_seq_state st; 598 const u8 *data; 599 unsigned int len; 600 unsigned int consumed = 0; 601 602 from = (unsigned int)(payload_ptr - skb->data); 603 604 skb_prepare_seq_read(skb, from, to, &st); 605 while ((len = skb_seq_read(consumed, &data, &st)) != 0) { 606 crc = crc32c(crc, data, len); 607 consumed += len; 608 } 609 610 return htonl(crc); 611 } 612 613 /** 614 * batadv_get_vid() - extract the VLAN identifier from skb if any 615 * @skb: the buffer containing the packet 616 * @header_len: length of the batman header preceding the ethernet header 617 * 618 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the 619 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. 620 */ 621 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) 622 { 623 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); 624 struct vlan_ethhdr *vhdr; 625 unsigned short vid; 626 627 if (ethhdr->h_proto != htons(ETH_P_8021Q)) 628 return BATADV_NO_FLAGS; 629 630 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) 631 return BATADV_NO_FLAGS; 632 633 vhdr = (struct vlan_ethhdr *)(skb->data + header_len); 634 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; 635 636 /* VID 0 is only used to indicate "priority tag" frames which only 637 * contain priority information and no VID. 638 */ 639 if (vid == 0) 640 return BATADV_NO_FLAGS; 641 642 vid |= BATADV_VLAN_HAS_TAG; 643 644 return vid; 645 } 646 647 /** 648 * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan 649 * @bat_priv: the bat priv with all the mesh interface information 650 * @vid: the VLAN identifier for which the AP isolation attributed as to be 651 * looked up 652 * 653 * Return: true if AP isolation is on for the VLAN identified by vid, false 654 * otherwise 655 */ 656 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) 657 { 658 bool ap_isolation_enabled = false; 659 struct batadv_meshif_vlan *vlan; 660 661 /* if the AP isolation is requested on a VLAN, then check for its 662 * setting in the proper VLAN private data structure 663 */ 664 vlan = batadv_meshif_vlan_get(bat_priv, vid); 665 if (vlan) { 666 ap_isolation_enabled = atomic_read(&vlan->ap_isolation); 667 batadv_meshif_vlan_put(vlan); 668 } 669 670 return ap_isolation_enabled; 671 } 672 673 /** 674 * batadv_throw_uevent() - Send an uevent with batman-adv specific env data 675 * @bat_priv: the bat priv with all the mesh interface information 676 * @type: subsystem type of event. Stored in uevent's BATTYPE 677 * @action: action type of event. Stored in uevent's BATACTION 678 * @data: string with additional information to the event (ignored for 679 * BATADV_UEV_DEL). Stored in uevent's BATDATA 680 * 681 * Return: 0 on success or negative error number in case of failure 682 */ 683 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, 684 enum batadv_uev_action action, const char *data) 685 { 686 int ret = -ENOMEM; 687 struct kobject *bat_kobj; 688 char *uevent_env[4] = { NULL, NULL, NULL, NULL }; 689 690 bat_kobj = &bat_priv->mesh_iface->dev.kobj; 691 692 uevent_env[0] = kasprintf(GFP_ATOMIC, 693 "%s%s", BATADV_UEV_TYPE_VAR, 694 batadv_uev_type_str[type]); 695 if (!uevent_env[0]) 696 goto report_error; 697 698 uevent_env[1] = kasprintf(GFP_ATOMIC, 699 "%s%s", BATADV_UEV_ACTION_VAR, 700 batadv_uev_action_str[action]); 701 if (!uevent_env[1]) 702 goto free_first_env; 703 704 /* If the event is DEL, ignore the data field */ 705 if (action != BATADV_UEV_DEL) { 706 uevent_env[2] = kasprintf(GFP_ATOMIC, 707 "%s%s", BATADV_UEV_DATA_VAR, data); 708 if (!uevent_env[2]) 709 goto free_second_env; 710 } 711 712 ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); 713 kfree(uevent_env[2]); 714 free_second_env: 715 kfree(uevent_env[1]); 716 free_first_env: 717 kfree(uevent_env[0]); 718 719 if (ret) 720 report_error: 721 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 722 "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", 723 batadv_uev_type_str[type], 724 batadv_uev_action_str[action], 725 (action == BATADV_UEV_DEL ? "NULL" : data), ret); 726 return ret; 727 } 728 729 module_init(batadv_init); 730 module_exit(batadv_exit); 731 732 MODULE_LICENSE("GPL"); 733 734 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); 735 MODULE_DESCRIPTION(BATADV_DRIVER_DESC); 736 MODULE_VERSION(BATADV_SOURCE_VERSION); 737 MODULE_ALIAS_RTNL_LINK("batadv"); 738 MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); 739