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 "main.h" 21 #include "sysfs.h" 22 #include "debugfs.h" 23 #include "routing.h" 24 #include "send.h" 25 #include "originator.h" 26 #include "soft-interface.h" 27 #include "icmp_socket.h" 28 #include "translation-table.h" 29 #include "hard-interface.h" 30 #include "gateway_client.h" 31 #include "bridge_loop_avoidance.h" 32 #include "vis.h" 33 #include "hash.h" 34 #include "bat_algo.h" 35 36 37 /* List manipulations on hardif_list have to be rtnl_lock()'ed, 38 * list traversals just rcu-locked 39 */ 40 struct list_head batadv_hardif_list; 41 static int (*batadv_rx_handler[256])(struct sk_buff *, 42 struct batadv_hard_iface *); 43 char batadv_routing_algo[20] = "BATMAN_IV"; 44 static struct hlist_head batadv_algo_list; 45 46 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 47 48 struct workqueue_struct *batadv_event_workqueue; 49 50 static void batadv_recv_handler_init(void); 51 52 static int __init batadv_init(void) 53 { 54 INIT_LIST_HEAD(&batadv_hardif_list); 55 INIT_HLIST_HEAD(&batadv_algo_list); 56 57 batadv_recv_handler_init(); 58 59 batadv_iv_init(); 60 61 batadv_event_workqueue = create_singlethread_workqueue("bat_events"); 62 63 if (!batadv_event_workqueue) 64 return -ENOMEM; 65 66 batadv_socket_init(); 67 batadv_debugfs_init(); 68 69 register_netdevice_notifier(&batadv_hard_if_notifier); 70 71 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", 72 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); 73 74 return 0; 75 } 76 77 static void __exit batadv_exit(void) 78 { 79 batadv_debugfs_destroy(); 80 unregister_netdevice_notifier(&batadv_hard_if_notifier); 81 batadv_hardif_remove_interfaces(); 82 83 flush_workqueue(batadv_event_workqueue); 84 destroy_workqueue(batadv_event_workqueue); 85 batadv_event_workqueue = NULL; 86 87 rcu_barrier(); 88 } 89 90 int batadv_mesh_init(struct net_device *soft_iface) 91 { 92 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 93 int ret; 94 95 spin_lock_init(&bat_priv->forw_bat_list_lock); 96 spin_lock_init(&bat_priv->forw_bcast_list_lock); 97 spin_lock_init(&bat_priv->tt.changes_list_lock); 98 spin_lock_init(&bat_priv->tt.req_list_lock); 99 spin_lock_init(&bat_priv->tt.roam_list_lock); 100 spin_lock_init(&bat_priv->tt.last_changeset_lock); 101 spin_lock_init(&bat_priv->gw.list_lock); 102 spin_lock_init(&bat_priv->vis.hash_lock); 103 spin_lock_init(&bat_priv->vis.list_lock); 104 105 INIT_HLIST_HEAD(&bat_priv->forw_bat_list); 106 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); 107 INIT_HLIST_HEAD(&bat_priv->gw.list); 108 INIT_LIST_HEAD(&bat_priv->tt.changes_list); 109 INIT_LIST_HEAD(&bat_priv->tt.req_list); 110 INIT_LIST_HEAD(&bat_priv->tt.roam_list); 111 112 ret = batadv_originator_init(bat_priv); 113 if (ret < 0) 114 goto err; 115 116 ret = batadv_tt_init(bat_priv); 117 if (ret < 0) 118 goto err; 119 120 batadv_tt_local_add(soft_iface, soft_iface->dev_addr, 121 BATADV_NULL_IFINDEX); 122 123 ret = batadv_vis_init(bat_priv); 124 if (ret < 0) 125 goto err; 126 127 ret = batadv_bla_init(bat_priv); 128 if (ret < 0) 129 goto err; 130 131 atomic_set(&bat_priv->gw.reselect, 0); 132 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); 133 134 return 0; 135 136 err: 137 batadv_mesh_free(soft_iface); 138 return ret; 139 } 140 141 void batadv_mesh_free(struct net_device *soft_iface) 142 { 143 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 144 145 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); 146 147 batadv_purge_outstanding_packets(bat_priv, NULL); 148 149 batadv_vis_quit(bat_priv); 150 151 batadv_gw_node_purge(bat_priv); 152 batadv_originator_free(bat_priv); 153 154 batadv_tt_free(bat_priv); 155 156 batadv_bla_free(bat_priv); 157 158 free_percpu(bat_priv->bat_counters); 159 160 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 161 } 162 163 void batadv_inc_module_count(void) 164 { 165 try_module_get(THIS_MODULE); 166 } 167 168 void batadv_dec_module_count(void) 169 { 170 module_put(THIS_MODULE); 171 } 172 173 int batadv_is_my_mac(const uint8_t *addr) 174 { 175 const struct batadv_hard_iface *hard_iface; 176 177 rcu_read_lock(); 178 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 179 if (hard_iface->if_status != BATADV_IF_ACTIVE) 180 continue; 181 182 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { 183 rcu_read_unlock(); 184 return 1; 185 } 186 } 187 rcu_read_unlock(); 188 return 0; 189 } 190 191 static int batadv_recv_unhandled_packet(struct sk_buff *skb, 192 struct batadv_hard_iface *recv_if) 193 { 194 return NET_RX_DROP; 195 } 196 197 /* incoming packets with the batman ethertype received on any active hard 198 * interface 199 */ 200 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, 201 struct packet_type *ptype, 202 struct net_device *orig_dev) 203 { 204 struct batadv_priv *bat_priv; 205 struct batadv_ogm_packet *batadv_ogm_packet; 206 struct batadv_hard_iface *hard_iface; 207 uint8_t idx; 208 int ret; 209 210 hard_iface = container_of(ptype, struct batadv_hard_iface, 211 batman_adv_ptype); 212 skb = skb_share_check(skb, GFP_ATOMIC); 213 214 /* skb was released by skb_share_check() */ 215 if (!skb) 216 goto err_out; 217 218 /* packet should hold at least type and version */ 219 if (unlikely(!pskb_may_pull(skb, 2))) 220 goto err_free; 221 222 /* expect a valid ethernet header here. */ 223 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) 224 goto err_free; 225 226 if (!hard_iface->soft_iface) 227 goto err_free; 228 229 bat_priv = netdev_priv(hard_iface->soft_iface); 230 231 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 232 goto err_free; 233 234 /* discard frames on not active interfaces */ 235 if (hard_iface->if_status != BATADV_IF_ACTIVE) 236 goto err_free; 237 238 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; 239 240 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { 241 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 242 "Drop packet: incompatible batman version (%i)\n", 243 batadv_ogm_packet->header.version); 244 goto err_free; 245 } 246 247 /* all receive handlers return whether they received or reused 248 * the supplied skb. if not, we have to free the skb. 249 */ 250 idx = batadv_ogm_packet->header.packet_type; 251 ret = (*batadv_rx_handler[idx])(skb, hard_iface); 252 253 if (ret == NET_RX_DROP) 254 kfree_skb(skb); 255 256 /* return NET_RX_SUCCESS in any case as we 257 * most probably dropped the packet for 258 * routing-logical reasons. 259 */ 260 return NET_RX_SUCCESS; 261 262 err_free: 263 kfree_skb(skb); 264 err_out: 265 return NET_RX_DROP; 266 } 267 268 static void batadv_recv_handler_init(void) 269 { 270 int i; 271 272 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) 273 batadv_rx_handler[i] = batadv_recv_unhandled_packet; 274 275 /* batman icmp packet */ 276 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; 277 /* unicast packet */ 278 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; 279 /* fragmented unicast packet */ 280 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; 281 /* broadcast packet */ 282 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; 283 /* vis packet */ 284 batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; 285 /* Translation table query (request or response) */ 286 batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; 287 /* Roaming advertisement */ 288 batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; 289 } 290 291 int 292 batadv_recv_handler_register(uint8_t packet_type, 293 int (*recv_handler)(struct sk_buff *, 294 struct batadv_hard_iface *)) 295 { 296 if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) 297 return -EBUSY; 298 299 batadv_rx_handler[packet_type] = recv_handler; 300 return 0; 301 } 302 303 void batadv_recv_handler_unregister(uint8_t packet_type) 304 { 305 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; 306 } 307 308 static struct batadv_algo_ops *batadv_algo_get(char *name) 309 { 310 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; 311 struct hlist_node *node; 312 313 hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) { 314 if (strcmp(bat_algo_ops_tmp->name, name) != 0) 315 continue; 316 317 bat_algo_ops = bat_algo_ops_tmp; 318 break; 319 } 320 321 return bat_algo_ops; 322 } 323 324 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) 325 { 326 struct batadv_algo_ops *bat_algo_ops_tmp; 327 int ret; 328 329 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); 330 if (bat_algo_ops_tmp) { 331 pr_info("Trying to register already registered routing algorithm: %s\n", 332 bat_algo_ops->name); 333 ret = -EEXIST; 334 goto out; 335 } 336 337 /* all algorithms must implement all ops (for now) */ 338 if (!bat_algo_ops->bat_iface_enable || 339 !bat_algo_ops->bat_iface_disable || 340 !bat_algo_ops->bat_iface_update_mac || 341 !bat_algo_ops->bat_primary_iface_set || 342 !bat_algo_ops->bat_ogm_schedule || 343 !bat_algo_ops->bat_ogm_emit) { 344 pr_info("Routing algo '%s' does not implement required ops\n", 345 bat_algo_ops->name); 346 ret = -EINVAL; 347 goto out; 348 } 349 350 INIT_HLIST_NODE(&bat_algo_ops->list); 351 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); 352 ret = 0; 353 354 out: 355 return ret; 356 } 357 358 int batadv_algo_select(struct batadv_priv *bat_priv, char *name) 359 { 360 struct batadv_algo_ops *bat_algo_ops; 361 int ret = -EINVAL; 362 363 bat_algo_ops = batadv_algo_get(name); 364 if (!bat_algo_ops) 365 goto out; 366 367 bat_priv->bat_algo_ops = bat_algo_ops; 368 ret = 0; 369 370 out: 371 return ret; 372 } 373 374 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) 375 { 376 struct batadv_algo_ops *bat_algo_ops; 377 struct hlist_node *node; 378 379 seq_printf(seq, "Available routing algorithms:\n"); 380 381 hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) { 382 seq_printf(seq, "%s\n", bat_algo_ops->name); 383 } 384 385 return 0; 386 } 387 388 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) 389 { 390 struct batadv_algo_ops *bat_algo_ops; 391 char *algo_name = (char *)val; 392 size_t name_len = strlen(algo_name); 393 394 if (algo_name[name_len - 1] == '\n') 395 algo_name[name_len - 1] = '\0'; 396 397 bat_algo_ops = batadv_algo_get(algo_name); 398 if (!bat_algo_ops) { 399 pr_err("Routing algorithm '%s' is not supported\n", algo_name); 400 return -EINVAL; 401 } 402 403 return param_set_copystring(algo_name, kp); 404 } 405 406 static const struct kernel_param_ops batadv_param_ops_ra = { 407 .set = batadv_param_set_ra, 408 .get = param_get_string, 409 }; 410 411 static struct kparam_string batadv_param_string_ra = { 412 .maxlen = sizeof(batadv_routing_algo), 413 .string = batadv_routing_algo, 414 }; 415 416 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, 417 0644); 418 module_init(batadv_init); 419 module_exit(batadv_exit); 420 421 MODULE_LICENSE("GPL"); 422 423 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); 424 MODULE_DESCRIPTION(BATADV_DRIVER_DESC); 425 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); 426 MODULE_VERSION(BATADV_SOURCE_VERSION); 427