| 1 | /* Copyright (C) 2009-2013 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 "distributed-arp-table.h" |
| 22 | #include "originator.h" |
| 23 | #include "hash.h" |
| 24 | #include "translation-table.h" |
| 25 | #include "routing.h" |
| 26 | #include "gateway_client.h" |
| 27 | #include "hard-interface.h" |
| 28 | #include "unicast.h" |
| 29 | #include "soft-interface.h" |
| 30 | #include "bridge_loop_avoidance.h" |
| 31 | |
| 32 | /* hash class keys */ |
| 33 | static struct lock_class_key batadv_orig_hash_lock_class_key; |
| 34 | |
| 35 | static void batadv_purge_orig(struct work_struct *work); |
| 36 | |
| 37 | /* returns 1 if they are the same originator */ |
| 38 | static int batadv_compare_orig(const struct hlist_node *node, const void *data2) |
| 39 | { |
| 40 | const void *data1 = container_of(node, struct batadv_orig_node, |
| 41 | hash_entry); |
| 42 | |
| 43 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); |
| 44 | } |
| 45 | |
| 46 | int batadv_originator_init(struct batadv_priv *bat_priv) |
| 47 | { |
| 48 | if (bat_priv->orig_hash) |
| 49 | return 0; |
| 50 | |
| 51 | bat_priv->orig_hash = batadv_hash_new(1024); |
| 52 | |
| 53 | if (!bat_priv->orig_hash) |
| 54 | goto err; |
| 55 | |
| 56 | batadv_hash_set_lock_class(bat_priv->orig_hash, |
| 57 | &batadv_orig_hash_lock_class_key); |
| 58 | |
| 59 | INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); |
| 60 | queue_delayed_work(batadv_event_workqueue, |
| 61 | &bat_priv->orig_work, |
| 62 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); |
| 63 | |
| 64 | return 0; |
| 65 | |
| 66 | err: |
| 67 | return -ENOMEM; |
| 68 | } |
| 69 | |
| 70 | void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node) |
| 71 | { |
| 72 | if (atomic_dec_and_test(&neigh_node->refcount)) |
| 73 | kfree_rcu(neigh_node, rcu); |
| 74 | } |
| 75 | |
| 76 | /* increases the refcounter of a found router */ |
| 77 | struct batadv_neigh_node * |
| 78 | batadv_orig_node_get_router(struct batadv_orig_node *orig_node) |
| 79 | { |
| 80 | struct batadv_neigh_node *router; |
| 81 | |
| 82 | rcu_read_lock(); |
| 83 | router = rcu_dereference(orig_node->router); |
| 84 | |
| 85 | if (router && !atomic_inc_not_zero(&router->refcount)) |
| 86 | router = NULL; |
| 87 | |
| 88 | rcu_read_unlock(); |
| 89 | return router; |
| 90 | } |
| 91 | |
| 92 | struct batadv_neigh_node * |
| 93 | batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, |
| 94 | const uint8_t *neigh_addr, uint32_t seqno) |
| 95 | { |
| 96 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| 97 | struct batadv_neigh_node *neigh_node; |
| 98 | |
| 99 | neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); |
| 100 | if (!neigh_node) |
| 101 | goto out; |
| 102 | |
| 103 | INIT_HLIST_NODE(&neigh_node->list); |
| 104 | |
| 105 | memcpy(neigh_node->addr, neigh_addr, ETH_ALEN); |
| 106 | spin_lock_init(&neigh_node->lq_update_lock); |
| 107 | |
| 108 | /* extra reference for return */ |
| 109 | atomic_set(&neigh_node->refcount, 2); |
| 110 | |
| 111 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 112 | "Creating new neighbor %pM, initial seqno %d\n", |
| 113 | neigh_addr, seqno); |
| 114 | |
| 115 | out: |
| 116 | return neigh_node; |
| 117 | } |
| 118 | |
| 119 | static void batadv_orig_node_free_rcu(struct rcu_head *rcu) |
| 120 | { |
| 121 | struct hlist_node *node_tmp; |
| 122 | struct batadv_neigh_node *neigh_node, *tmp_neigh_node; |
| 123 | struct batadv_orig_node *orig_node; |
| 124 | |
| 125 | orig_node = container_of(rcu, struct batadv_orig_node, rcu); |
| 126 | |
| 127 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 128 | |
| 129 | /* for all bonding members ... */ |
| 130 | list_for_each_entry_safe(neigh_node, tmp_neigh_node, |
| 131 | &orig_node->bond_list, bonding_list) { |
| 132 | list_del_rcu(&neigh_node->bonding_list); |
| 133 | batadv_neigh_node_free_ref(neigh_node); |
| 134 | } |
| 135 | |
| 136 | /* for all neighbors towards this originator ... */ |
| 137 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
| 138 | &orig_node->neigh_list, list) { |
| 139 | hlist_del_rcu(&neigh_node->list); |
| 140 | batadv_neigh_node_free_ref(neigh_node); |
| 141 | } |
| 142 | |
| 143 | spin_unlock_bh(&orig_node->neigh_list_lock); |
| 144 | |
| 145 | batadv_frag_list_free(&orig_node->frag_list); |
| 146 | batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, |
| 147 | "originator timed out"); |
| 148 | |
| 149 | kfree(orig_node->tt_buff); |
| 150 | kfree(orig_node->bcast_own); |
| 151 | kfree(orig_node->bcast_own_sum); |
| 152 | kfree(orig_node); |
| 153 | } |
| 154 | |
| 155 | void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node) |
| 156 | { |
| 157 | if (atomic_dec_and_test(&orig_node->refcount)) |
| 158 | call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu); |
| 159 | } |
| 160 | |
| 161 | void batadv_originator_free(struct batadv_priv *bat_priv) |
| 162 | { |
| 163 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
| 164 | struct hlist_node *node_tmp; |
| 165 | struct hlist_head *head; |
| 166 | spinlock_t *list_lock; /* spinlock to protect write access */ |
| 167 | struct batadv_orig_node *orig_node; |
| 168 | uint32_t i; |
| 169 | |
| 170 | if (!hash) |
| 171 | return; |
| 172 | |
| 173 | cancel_delayed_work_sync(&bat_priv->orig_work); |
| 174 | |
| 175 | bat_priv->orig_hash = NULL; |
| 176 | |
| 177 | for (i = 0; i < hash->size; i++) { |
| 178 | head = &hash->table[i]; |
| 179 | list_lock = &hash->list_locks[i]; |
| 180 | |
| 181 | spin_lock_bh(list_lock); |
| 182 | hlist_for_each_entry_safe(orig_node, node_tmp, |
| 183 | head, hash_entry) { |
| 184 | hlist_del_rcu(&orig_node->hash_entry); |
| 185 | batadv_orig_node_free_ref(orig_node); |
| 186 | } |
| 187 | spin_unlock_bh(list_lock); |
| 188 | } |
| 189 | |
| 190 | batadv_hash_destroy(hash); |
| 191 | } |
| 192 | |
| 193 | /* this function finds or creates an originator entry for the given |
| 194 | * address if it does not exits |
| 195 | */ |
| 196 | struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, |
| 197 | const uint8_t *addr) |
| 198 | { |
| 199 | struct batadv_orig_node *orig_node; |
| 200 | int size; |
| 201 | int hash_added; |
| 202 | unsigned long reset_time; |
| 203 | |
| 204 | orig_node = batadv_orig_hash_find(bat_priv, addr); |
| 205 | if (orig_node) |
| 206 | return orig_node; |
| 207 | |
| 208 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 209 | "Creating new originator: %pM\n", addr); |
| 210 | |
| 211 | orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC); |
| 212 | if (!orig_node) |
| 213 | return NULL; |
| 214 | |
| 215 | INIT_HLIST_HEAD(&orig_node->neigh_list); |
| 216 | INIT_LIST_HEAD(&orig_node->bond_list); |
| 217 | spin_lock_init(&orig_node->ogm_cnt_lock); |
| 218 | spin_lock_init(&orig_node->bcast_seqno_lock); |
| 219 | spin_lock_init(&orig_node->neigh_list_lock); |
| 220 | spin_lock_init(&orig_node->tt_buff_lock); |
| 221 | |
| 222 | /* extra reference for return */ |
| 223 | atomic_set(&orig_node->refcount, 2); |
| 224 | |
| 225 | orig_node->tt_initialised = false; |
| 226 | orig_node->bat_priv = bat_priv; |
| 227 | memcpy(orig_node->orig, addr, ETH_ALEN); |
| 228 | batadv_dat_init_orig_node_addr(orig_node); |
| 229 | orig_node->router = NULL; |
| 230 | orig_node->tt_crc = 0; |
| 231 | atomic_set(&orig_node->last_ttvn, 0); |
| 232 | orig_node->tt_buff = NULL; |
| 233 | orig_node->tt_buff_len = 0; |
| 234 | atomic_set(&orig_node->tt_size, 0); |
| 235 | reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); |
| 236 | orig_node->bcast_seqno_reset = reset_time; |
| 237 | orig_node->batman_seqno_reset = reset_time; |
| 238 | |
| 239 | atomic_set(&orig_node->bond_candidates, 0); |
| 240 | |
| 241 | size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; |
| 242 | |
| 243 | orig_node->bcast_own = kzalloc(size, GFP_ATOMIC); |
| 244 | if (!orig_node->bcast_own) |
| 245 | goto free_orig_node; |
| 246 | |
| 247 | size = bat_priv->num_ifaces * sizeof(uint8_t); |
| 248 | orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC); |
| 249 | |
| 250 | INIT_LIST_HEAD(&orig_node->frag_list); |
| 251 | orig_node->last_frag_packet = 0; |
| 252 | |
| 253 | if (!orig_node->bcast_own_sum) |
| 254 | goto free_bcast_own; |
| 255 | |
| 256 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
| 257 | batadv_choose_orig, orig_node, |
| 258 | &orig_node->hash_entry); |
| 259 | if (hash_added != 0) |
| 260 | goto free_bcast_own_sum; |
| 261 | |
| 262 | return orig_node; |
| 263 | free_bcast_own_sum: |
| 264 | kfree(orig_node->bcast_own_sum); |
| 265 | free_bcast_own: |
| 266 | kfree(orig_node->bcast_own); |
| 267 | free_orig_node: |
| 268 | kfree(orig_node); |
| 269 | return NULL; |
| 270 | } |
| 271 | |
| 272 | static bool |
| 273 | batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, |
| 274 | struct batadv_orig_node *orig_node, |
| 275 | struct batadv_neigh_node **best_neigh_node) |
| 276 | { |
| 277 | struct hlist_node *node_tmp; |
| 278 | struct batadv_neigh_node *neigh_node; |
| 279 | bool neigh_purged = false; |
| 280 | unsigned long last_seen; |
| 281 | struct batadv_hard_iface *if_incoming; |
| 282 | |
| 283 | *best_neigh_node = NULL; |
| 284 | |
| 285 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 286 | |
| 287 | /* for all neighbors towards this originator ... */ |
| 288 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
| 289 | &orig_node->neigh_list, list) { |
| 290 | last_seen = neigh_node->last_seen; |
| 291 | if_incoming = neigh_node->if_incoming; |
| 292 | |
| 293 | if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) || |
| 294 | (if_incoming->if_status == BATADV_IF_INACTIVE) || |
| 295 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || |
| 296 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) { |
| 297 | if ((if_incoming->if_status == BATADV_IF_INACTIVE) || |
| 298 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || |
| 299 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) |
| 300 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 301 | "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n", |
| 302 | orig_node->orig, neigh_node->addr, |
| 303 | if_incoming->net_dev->name); |
| 304 | else |
| 305 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 306 | "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n", |
| 307 | orig_node->orig, neigh_node->addr, |
| 308 | jiffies_to_msecs(last_seen)); |
| 309 | |
| 310 | neigh_purged = true; |
| 311 | |
| 312 | hlist_del_rcu(&neigh_node->list); |
| 313 | batadv_bonding_candidate_del(orig_node, neigh_node); |
| 314 | batadv_neigh_node_free_ref(neigh_node); |
| 315 | } else { |
| 316 | if ((!*best_neigh_node) || |
| 317 | (neigh_node->tq_avg > (*best_neigh_node)->tq_avg)) |
| 318 | *best_neigh_node = neigh_node; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | spin_unlock_bh(&orig_node->neigh_list_lock); |
| 323 | return neigh_purged; |
| 324 | } |
| 325 | |
| 326 | static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, |
| 327 | struct batadv_orig_node *orig_node) |
| 328 | { |
| 329 | struct batadv_neigh_node *best_neigh_node; |
| 330 | |
| 331 | if (batadv_has_timed_out(orig_node->last_seen, |
| 332 | 2 * BATADV_PURGE_TIMEOUT)) { |
| 333 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 334 | "Originator timeout: originator %pM, last_seen %u\n", |
| 335 | orig_node->orig, |
| 336 | jiffies_to_msecs(orig_node->last_seen)); |
| 337 | return true; |
| 338 | } else { |
| 339 | if (batadv_purge_orig_neighbors(bat_priv, orig_node, |
| 340 | &best_neigh_node)) |
| 341 | batadv_update_route(bat_priv, orig_node, |
| 342 | best_neigh_node); |
| 343 | } |
| 344 | |
| 345 | return false; |
| 346 | } |
| 347 | |
| 348 | static void _batadv_purge_orig(struct batadv_priv *bat_priv) |
| 349 | { |
| 350 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
| 351 | struct hlist_node *node_tmp; |
| 352 | struct hlist_head *head; |
| 353 | spinlock_t *list_lock; /* spinlock to protect write access */ |
| 354 | struct batadv_orig_node *orig_node; |
| 355 | uint32_t i; |
| 356 | |
| 357 | if (!hash) |
| 358 | return; |
| 359 | |
| 360 | /* for all origins... */ |
| 361 | for (i = 0; i < hash->size; i++) { |
| 362 | head = &hash->table[i]; |
| 363 | list_lock = &hash->list_locks[i]; |
| 364 | |
| 365 | spin_lock_bh(list_lock); |
| 366 | hlist_for_each_entry_safe(orig_node, node_tmp, |
| 367 | head, hash_entry) { |
| 368 | if (batadv_purge_orig_node(bat_priv, orig_node)) { |
| 369 | if (orig_node->gw_flags) |
| 370 | batadv_gw_node_delete(bat_priv, |
| 371 | orig_node); |
| 372 | hlist_del_rcu(&orig_node->hash_entry); |
| 373 | batadv_orig_node_free_ref(orig_node); |
| 374 | continue; |
| 375 | } |
| 376 | |
| 377 | if (batadv_has_timed_out(orig_node->last_frag_packet, |
| 378 | BATADV_FRAG_TIMEOUT)) |
| 379 | batadv_frag_list_free(&orig_node->frag_list); |
| 380 | } |
| 381 | spin_unlock_bh(list_lock); |
| 382 | } |
| 383 | |
| 384 | batadv_gw_node_purge(bat_priv); |
| 385 | batadv_gw_election(bat_priv); |
| 386 | } |
| 387 | |
| 388 | static void batadv_purge_orig(struct work_struct *work) |
| 389 | { |
| 390 | struct delayed_work *delayed_work; |
| 391 | struct batadv_priv *bat_priv; |
| 392 | |
| 393 | delayed_work = container_of(work, struct delayed_work, work); |
| 394 | bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); |
| 395 | _batadv_purge_orig(bat_priv); |
| 396 | queue_delayed_work(batadv_event_workqueue, |
| 397 | &bat_priv->orig_work, |
| 398 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); |
| 399 | } |
| 400 | |
| 401 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv) |
| 402 | { |
| 403 | _batadv_purge_orig(bat_priv); |
| 404 | } |
| 405 | |
| 406 | int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) |
| 407 | { |
| 408 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 409 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 410 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
| 411 | struct hlist_head *head; |
| 412 | struct batadv_hard_iface *primary_if; |
| 413 | struct batadv_orig_node *orig_node; |
| 414 | struct batadv_neigh_node *neigh_node, *neigh_node_tmp; |
| 415 | int batman_count = 0; |
| 416 | int last_seen_secs; |
| 417 | int last_seen_msecs; |
| 418 | unsigned long last_seen_jiffies; |
| 419 | uint32_t i; |
| 420 | |
| 421 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 422 | if (!primary_if) |
| 423 | goto out; |
| 424 | |
| 425 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
| 426 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
| 427 | primary_if->net_dev->dev_addr, net_dev->name); |
| 428 | seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", |
| 429 | "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, |
| 430 | "Nexthop", "outgoingIF", "Potential nexthops"); |
| 431 | |
| 432 | for (i = 0; i < hash->size; i++) { |
| 433 | head = &hash->table[i]; |
| 434 | |
| 435 | rcu_read_lock(); |
| 436 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
| 437 | neigh_node = batadv_orig_node_get_router(orig_node); |
| 438 | if (!neigh_node) |
| 439 | continue; |
| 440 | |
| 441 | if (neigh_node->tq_avg == 0) |
| 442 | goto next; |
| 443 | |
| 444 | last_seen_jiffies = jiffies - orig_node->last_seen; |
| 445 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); |
| 446 | last_seen_secs = last_seen_msecs / 1000; |
| 447 | last_seen_msecs = last_seen_msecs % 1000; |
| 448 | |
| 449 | seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", |
| 450 | orig_node->orig, last_seen_secs, |
| 451 | last_seen_msecs, neigh_node->tq_avg, |
| 452 | neigh_node->addr, |
| 453 | neigh_node->if_incoming->net_dev->name); |
| 454 | |
| 455 | hlist_for_each_entry_rcu(neigh_node_tmp, |
| 456 | &orig_node->neigh_list, list) { |
| 457 | seq_printf(seq, " %pM (%3i)", |
| 458 | neigh_node_tmp->addr, |
| 459 | neigh_node_tmp->tq_avg); |
| 460 | } |
| 461 | |
| 462 | seq_printf(seq, "\n"); |
| 463 | batman_count++; |
| 464 | |
| 465 | next: |
| 466 | batadv_neigh_node_free_ref(neigh_node); |
| 467 | } |
| 468 | rcu_read_unlock(); |
| 469 | } |
| 470 | |
| 471 | if (batman_count == 0) |
| 472 | seq_printf(seq, "No batman nodes in range ...\n"); |
| 473 | |
| 474 | out: |
| 475 | if (primary_if) |
| 476 | batadv_hardif_free_ref(primary_if); |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node, |
| 481 | int max_if_num) |
| 482 | { |
| 483 | void *data_ptr; |
| 484 | size_t data_size, old_size; |
| 485 | |
| 486 | data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS; |
| 487 | old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; |
| 488 | data_ptr = kmalloc(data_size, GFP_ATOMIC); |
| 489 | if (!data_ptr) |
| 490 | return -ENOMEM; |
| 491 | |
| 492 | memcpy(data_ptr, orig_node->bcast_own, old_size); |
| 493 | kfree(orig_node->bcast_own); |
| 494 | orig_node->bcast_own = data_ptr; |
| 495 | |
| 496 | data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); |
| 497 | if (!data_ptr) |
| 498 | return -ENOMEM; |
| 499 | |
| 500 | memcpy(data_ptr, orig_node->bcast_own_sum, |
| 501 | (max_if_num - 1) * sizeof(uint8_t)); |
| 502 | kfree(orig_node->bcast_own_sum); |
| 503 | orig_node->bcast_own_sum = data_ptr; |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
| 509 | int max_if_num) |
| 510 | { |
| 511 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| 512 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
| 513 | struct hlist_head *head; |
| 514 | struct batadv_orig_node *orig_node; |
| 515 | uint32_t i; |
| 516 | int ret; |
| 517 | |
| 518 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on |
| 519 | * if_num |
| 520 | */ |
| 521 | for (i = 0; i < hash->size; i++) { |
| 522 | head = &hash->table[i]; |
| 523 | |
| 524 | rcu_read_lock(); |
| 525 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
| 526 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
| 527 | ret = batadv_orig_node_add_if(orig_node, max_if_num); |
| 528 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
| 529 | |
| 530 | if (ret == -ENOMEM) |
| 531 | goto err; |
| 532 | } |
| 533 | rcu_read_unlock(); |
| 534 | } |
| 535 | |
| 536 | return 0; |
| 537 | |
| 538 | err: |
| 539 | rcu_read_unlock(); |
| 540 | return -ENOMEM; |
| 541 | } |
| 542 | |
| 543 | static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node, |
| 544 | int max_if_num, int del_if_num) |
| 545 | { |
| 546 | void *data_ptr = NULL; |
| 547 | int chunk_size; |
| 548 | |
| 549 | /* last interface was removed */ |
| 550 | if (max_if_num == 0) |
| 551 | goto free_bcast_own; |
| 552 | |
| 553 | chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; |
| 554 | data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); |
| 555 | if (!data_ptr) |
| 556 | return -ENOMEM; |
| 557 | |
| 558 | /* copy first part */ |
| 559 | memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size); |
| 560 | |
| 561 | /* copy second part */ |
| 562 | memcpy((char *)data_ptr + del_if_num * chunk_size, |
| 563 | orig_node->bcast_own + ((del_if_num + 1) * chunk_size), |
| 564 | (max_if_num - del_if_num) * chunk_size); |
| 565 | |
| 566 | free_bcast_own: |
| 567 | kfree(orig_node->bcast_own); |
| 568 | orig_node->bcast_own = data_ptr; |
| 569 | |
| 570 | if (max_if_num == 0) |
| 571 | goto free_own_sum; |
| 572 | |
| 573 | data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); |
| 574 | if (!data_ptr) |
| 575 | return -ENOMEM; |
| 576 | |
| 577 | memcpy(data_ptr, orig_node->bcast_own_sum, |
| 578 | del_if_num * sizeof(uint8_t)); |
| 579 | |
| 580 | memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), |
| 581 | orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)), |
| 582 | (max_if_num - del_if_num) * sizeof(uint8_t)); |
| 583 | |
| 584 | free_own_sum: |
| 585 | kfree(orig_node->bcast_own_sum); |
| 586 | orig_node->bcast_own_sum = data_ptr; |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, |
| 592 | int max_if_num) |
| 593 | { |
| 594 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| 595 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
| 596 | struct hlist_head *head; |
| 597 | struct batadv_hard_iface *hard_iface_tmp; |
| 598 | struct batadv_orig_node *orig_node; |
| 599 | uint32_t i; |
| 600 | int ret; |
| 601 | |
| 602 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on |
| 603 | * if_num |
| 604 | */ |
| 605 | for (i = 0; i < hash->size; i++) { |
| 606 | head = &hash->table[i]; |
| 607 | |
| 608 | rcu_read_lock(); |
| 609 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
| 610 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
| 611 | ret = batadv_orig_node_del_if(orig_node, max_if_num, |
| 612 | hard_iface->if_num); |
| 613 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
| 614 | |
| 615 | if (ret == -ENOMEM) |
| 616 | goto err; |
| 617 | } |
| 618 | rcu_read_unlock(); |
| 619 | } |
| 620 | |
| 621 | /* renumber remaining batman interfaces _inside_ of orig_hash_lock */ |
| 622 | rcu_read_lock(); |
| 623 | list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) { |
| 624 | if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE) |
| 625 | continue; |
| 626 | |
| 627 | if (hard_iface == hard_iface_tmp) |
| 628 | continue; |
| 629 | |
| 630 | if (hard_iface->soft_iface != hard_iface_tmp->soft_iface) |
| 631 | continue; |
| 632 | |
| 633 | if (hard_iface_tmp->if_num > hard_iface->if_num) |
| 634 | hard_iface_tmp->if_num--; |
| 635 | } |
| 636 | rcu_read_unlock(); |
| 637 | |
| 638 | hard_iface->if_num = -1; |
| 639 | return 0; |
| 640 | |
| 641 | err: |
| 642 | rcu_read_unlock(); |
| 643 | return -ENOMEM; |
| 644 | } |