1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301, USA 18 */ 19 20 #include <linux/crc32c.h> 21 #include <linux/highmem.h> 22 #include "main.h" 23 #include "sysfs.h" 24 #include "debugfs.h" 25 #include "routing.h" 26 #include "send.h" 27 #include "originator.h" 28 #include "soft-interface.h" 29 #include "icmp_socket.h" 30 #include "translation-table.h" 31 #include "hard-interface.h" 32 #include "gateway_client.h" 33 #include "bridge_loop_avoidance.h" 34 #include "distributed-arp-table.h" 35 #include "vis.h" 36 #include "hash.h" 37 #include "bat_algo.h" 38 39 40 /* List manipulations on hardif_list have to be rtnl_lock()'ed, 41 * list traversals just rcu-locked 42 */ 43 struct list_head batadv_hardif_list; 44 static int (*batadv_rx_handler[256])(struct sk_buff *, 45 struct batadv_hard_iface *); 46 char batadv_routing_algo[20] = "BATMAN_IV"; 47 static struct hlist_head batadv_algo_list; 48 49 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 50 51 struct workqueue_struct *batadv_event_workqueue; 52 53 static void batadv_recv_handler_init(void); 54 55 static int __init batadv_init(void) 56 { 57 INIT_LIST_HEAD(&batadv_hardif_list); 58 INIT_HLIST_HEAD(&batadv_algo_list); 59 60 batadv_recv_handler_init(); 61 62 batadv_iv_init(); 63 64 batadv_event_workqueue = create_singlethread_workqueue("bat_events"); 65 66 if (!batadv_event_workqueue) 67 return -ENOMEM; 68 69 batadv_socket_init(); 70 batadv_debugfs_init(); 71 72 register_netdevice_notifier(&batadv_hard_if_notifier); 73 74 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", 75 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); 76 77 return 0; 78 } 79 80 static void __exit batadv_exit(void) 81 { 82 batadv_debugfs_destroy(); 83 unregister_netdevice_notifier(&batadv_hard_if_notifier); 84 batadv_hardif_remove_interfaces(); 85 86 flush_workqueue(batadv_event_workqueue); 87 destroy_workqueue(batadv_event_workqueue); 88 batadv_event_workqueue = NULL; 89 90 rcu_barrier(); 91 } 92 93 int batadv_mesh_init(struct net_device *soft_iface) 94 { 95 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 96 int ret; 97 98 spin_lock_init(&bat_priv->forw_bat_list_lock); 99 spin_lock_init(&bat_priv->forw_bcast_list_lock); 100 spin_lock_init(&bat_priv->tt.changes_list_lock); 101 spin_lock_init(&bat_priv->tt.req_list_lock); 102 spin_lock_init(&bat_priv->tt.roam_list_lock); 103 spin_lock_init(&bat_priv->tt.last_changeset_lock); 104 spin_lock_init(&bat_priv->gw.list_lock); 105 spin_lock_init(&bat_priv->vis.hash_lock); 106 spin_lock_init(&bat_priv->vis.list_lock); 107 108 INIT_HLIST_HEAD(&bat_priv->forw_bat_list); 109 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); 110 INIT_HLIST_HEAD(&bat_priv->gw.list); 111 INIT_LIST_HEAD(&bat_priv->tt.changes_list); 112 INIT_LIST_HEAD(&bat_priv->tt.req_list); 113 INIT_LIST_HEAD(&bat_priv->tt.roam_list); 114 115 ret = batadv_originator_init(bat_priv); 116 if (ret < 0) 117 goto err; 118 119 ret = batadv_tt_init(bat_priv); 120 if (ret < 0) 121 goto err; 122 123 batadv_tt_local_add(soft_iface, soft_iface->dev_addr, 124 BATADV_NULL_IFINDEX); 125 126 ret = batadv_vis_init(bat_priv); 127 if (ret < 0) 128 goto err; 129 130 ret = batadv_bla_init(bat_priv); 131 if (ret < 0) 132 goto err; 133 134 ret = batadv_dat_init(bat_priv); 135 if (ret < 0) 136 goto err; 137 138 atomic_set(&bat_priv->gw.reselect, 0); 139 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); 140 141 return 0; 142 143 err: 144 batadv_mesh_free(soft_iface); 145 return ret; 146 } 147 148 void batadv_mesh_free(struct net_device *soft_iface) 149 { 150 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 151 152 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 153 154 batadv_purge_outstanding_packets(bat_priv, NULL); 155 156 batadv_vis_quit(bat_priv); 157 158 batadv_gw_node_purge(bat_priv); 159 batadv_originator_free(bat_priv); 160 161 batadv_tt_free(bat_priv); 162 163 batadv_bla_free(bat_priv); 164 165 batadv_dat_free(bat_priv); 166 167 free_percpu(bat_priv->bat_counters); 168 169 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 170 } 171 172 int batadv_is_my_mac(const uint8_t *addr) 173 { 174 const struct batadv_hard_iface *hard_iface; 175 176 rcu_read_lock(); 177 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 178 if (hard_iface->if_status != BATADV_IF_ACTIVE) 179 continue; 180 181 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { 182 rcu_read_unlock(); 183 return 1; 184 } 185 } 186 rcu_read_unlock(); 187 return 0; 188 } 189 190 /** 191 * batadv_seq_print_text_primary_if_get - called from debugfs table printing 192 * function that requires the primary interface 193 * @seq: debugfs table seq_file struct 194 * 195 * Returns primary interface if found or NULL otherwise. 196 */ 197 struct batadv_hard_iface * 198 batadv_seq_print_text_primary_if_get(struct seq_file *seq) 199 { 200 struct net_device *net_dev = (struct net_device *)seq->private; 201 struct batadv_priv *bat_priv = netdev_priv(net_dev); 202 struct batadv_hard_iface *primary_if; 203 204 primary_if = batadv_primary_if_get_selected(bat_priv); 205 206 if (!primary_if) { 207 seq_printf(seq, 208 "BATMAN mesh %s disabled - please specify interfaces to enable it\n", 209 net_dev->name); 210 goto out; 211 } 212 213 if (primary_if->if_status == BATADV_IF_ACTIVE) 214 goto out; 215 216 seq_printf(seq, 217 "BATMAN mesh %s disabled - primary interface not active\n", 218 net_dev->name); 219 batadv_hardif_free_ref(primary_if); 220 primary_if = NULL; 221 222 out: 223 return primary_if; 224 } 225 226 static int batadv_recv_unhandled_packet(struct sk_buff *skb, 227 struct batadv_hard_iface *recv_if) 228 { 229 return NET_RX_DROP; 230 } 231 232 /* incoming packets with the batman ethertype received on any active hard 233 * interface 234 */ 235 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, 236 struct packet_type *ptype, 237 struct net_device *orig_dev) 238 { 239 struct batadv_priv *bat_priv; 240 struct batadv_ogm_packet *batadv_ogm_packet; 241 struct batadv_hard_iface *hard_iface; 242 uint8_t idx; 243 int ret; 244 245 hard_iface = container_of(ptype, struct batadv_hard_iface, 246 batman_adv_ptype); 247 skb = skb_share_check(skb, GFP_ATOMIC); 248 249 /* skb was released by skb_share_check() */ 250 if (!skb) 251 goto err_out; 252 253 /* packet should hold at least type and version */ 254 if (unlikely(!pskb_may_pull(skb, 2))) 255 goto err_free; 256 257 /* expect a valid ethernet header here. */ 258 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) 259 goto err_free; 260 261 if (!hard_iface->soft_iface) 262 goto err_free; 263 264 bat_priv = netdev_priv(hard_iface->soft_iface); 265 266 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 267 goto err_free; 268 269 /* discard frames on not active interfaces */ 270 if (hard_iface->if_status != BATADV_IF_ACTIVE) 271 goto err_free; 272 273 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; 274 275 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { 276 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 277 "Drop packet: incompatible batman version (%i)\n", 278 batadv_ogm_packet->header.version); 279 goto err_free; 280 } 281 282 /* all receive handlers return whether they received or reused 283 * the supplied skb. if not, we have to free the skb. 284 */ 285 idx = batadv_ogm_packet->header.packet_type; 286 ret = (*batadv_rx_handler[idx])(skb, hard_iface); 287 288 if (ret == NET_RX_DROP) 289 kfree_skb(skb); 290 291 /* return NET_RX_SUCCESS in any case as we 292 * most probably dropped the packet for 293 * routing-logical reasons. 294 */ 295 return NET_RX_SUCCESS; 296 297 err_free: 298 kfree_skb(skb); 299 err_out: 300 return NET_RX_DROP; 301 } 302 303 static void batadv_recv_handler_init(void) 304 { 305 int i; 306 307 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) 308 batadv_rx_handler[i] = batadv_recv_unhandled_packet; 309 310 /* batman icmp packet */ 311 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; 312 /* unicast with 4 addresses packet */ 313 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; 314 /* unicast packet */ 315 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; 316 /* fragmented unicast packet */ 317 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; 318 /* broadcast packet */ 319 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; 320 /* vis packet */ 321 batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; 322 /* Translation table query (request or response) */ 323 batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; 324 /* Roaming advertisement */ 325 batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; 326 } 327 328 int 329 batadv_recv_handler_register(uint8_t packet_type, 330 int (*recv_handler)(struct sk_buff *, 331 struct batadv_hard_iface *)) 332 { 333 if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) 334 return -EBUSY; 335 336 batadv_rx_handler[packet_type] = recv_handler; 337 return 0; 338 } 339 340 void batadv_recv_handler_unregister(uint8_t packet_type) 341 { 342 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; 343 } 344 345 static struct batadv_algo_ops *batadv_algo_get(char *name) 346 { 347 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; 348 struct hlist_node *node; 349 350 hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) { 351 if (strcmp(bat_algo_ops_tmp->name, name) != 0) 352 continue; 353 354 bat_algo_ops = bat_algo_ops_tmp; 355 break; 356 } 357 358 return bat_algo_ops; 359 } 360 361 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) 362 { 363 struct batadv_algo_ops *bat_algo_ops_tmp; 364 int ret; 365 366 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); 367 if (bat_algo_ops_tmp) { 368 pr_info("Trying to register already registered routing algorithm: %s\n", 369 bat_algo_ops->name); 370 ret = -EEXIST; 371 goto out; 372 } 373 374 /* all algorithms must implement all ops (for now) */ 375 if (!bat_algo_ops->bat_iface_enable || 376 !bat_algo_ops->bat_iface_disable || 377 !bat_algo_ops->bat_iface_update_mac || 378 !bat_algo_ops->bat_primary_iface_set || 379 !bat_algo_ops->bat_ogm_schedule || 380 !bat_algo_ops->bat_ogm_emit) { 381 pr_info("Routing algo '%s' does not implement required ops\n", 382 bat_algo_ops->name); 383 ret = -EINVAL; 384 goto out; 385 } 386 387 INIT_HLIST_NODE(&bat_algo_ops->list); 388 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); 389 ret = 0; 390 391 out: 392 return ret; 393 } 394 395 int batadv_algo_select(struct batadv_priv *bat_priv, char *name) 396 { 397 struct batadv_algo_ops *bat_algo_ops; 398 int ret = -EINVAL; 399 400 bat_algo_ops = batadv_algo_get(name); 401 if (!bat_algo_ops) 402 goto out; 403 404 bat_priv->bat_algo_ops = bat_algo_ops; 405 ret = 0; 406 407 out: 408 return ret; 409 } 410 411 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) 412 { 413 struct batadv_algo_ops *bat_algo_ops; 414 struct hlist_node *node; 415 416 seq_printf(seq, "Available routing algorithms:\n"); 417 418 hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) { 419 seq_printf(seq, "%s\n", bat_algo_ops->name); 420 } 421 422 return 0; 423 } 424 425 /** 426 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in 427 * the header 428 * @skb: skb pointing to fragmented socket buffers 429 * @payload_ptr: Pointer to position inside the head buffer of the skb 430 * marking the start of the data to be CRC'ed 431 * 432 * payload_ptr must always point to an address in the skb head buffer and not to 433 * a fragment. 434 */ 435 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) 436 { 437 u32 crc = 0; 438 unsigned int from; 439 unsigned int to = skb->len; 440 struct skb_seq_state st; 441 const u8 *data; 442 unsigned int len; 443 unsigned int consumed = 0; 444 445 from = (unsigned int)(payload_ptr - skb->data); 446 447 skb_prepare_seq_read(skb, from, to, &st); 448 while ((len = skb_seq_read(consumed, &data, &st)) != 0) { 449 crc = crc32c(crc, data, len); 450 consumed += len; 451 } 452 skb_abort_seq_read(&st); 453 454 return htonl(crc); 455 } 456 457 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) 458 { 459 struct batadv_algo_ops *bat_algo_ops; 460 char *algo_name = (char *)val; 461 size_t name_len = strlen(algo_name); 462 463 if (algo_name[name_len - 1] == '\n') 464 algo_name[name_len - 1] = '\0'; 465 466 bat_algo_ops = batadv_algo_get(algo_name); 467 if (!bat_algo_ops) { 468 pr_err("Routing algorithm '%s' is not supported\n", algo_name); 469 return -EINVAL; 470 } 471 472 return param_set_copystring(algo_name, kp); 473 } 474 475 static const struct kernel_param_ops batadv_param_ops_ra = { 476 .set = batadv_param_set_ra, 477 .get = param_get_string, 478 }; 479 480 static struct kparam_string batadv_param_string_ra = { 481 .maxlen = sizeof(batadv_routing_algo), 482 .string = batadv_routing_algo, 483 }; 484 485 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, 486 0644); 487 module_init(batadv_init); 488 module_exit(batadv_exit); 489 490 MODULE_LICENSE("GPL"); 491 492 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); 493 MODULE_DESCRIPTION(BATADV_DRIVER_DESC); 494 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); 495 MODULE_VERSION(BATADV_SOURCE_VERSION); 496