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