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