linux/net/batman-adv/main.c
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   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 */
  40struct list_head batadv_hardif_list;
  41static int (*batadv_rx_handler[256])(struct sk_buff *,
  42                                     struct batadv_hard_iface *);
  43char batadv_routing_algo[20] = "BATMAN_IV";
  44static struct hlist_head batadv_algo_list;
  45
  46unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  47
  48struct workqueue_struct *batadv_event_workqueue;
  49
  50static void batadv_recv_handler_init(void);
  51
  52static 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        /* the name should not be longer than 10 chars - see
  62         * http://lwn.net/Articles/23634/
  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
  80static 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
  93int 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_buff_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        atomic_set(&bat_priv->gw_reselect, 0);
 135        atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
 136
 137        return 0;
 138
 139err:
 140        batadv_mesh_free(soft_iface);
 141        return ret;
 142}
 143
 144void batadv_mesh_free(struct net_device *soft_iface)
 145{
 146        struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 147
 148        atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
 149
 150        batadv_purge_outstanding_packets(bat_priv, NULL);
 151
 152        batadv_vis_quit(bat_priv);
 153
 154        batadv_gw_node_purge(bat_priv);
 155        batadv_originator_free(bat_priv);
 156
 157        batadv_tt_free(bat_priv);
 158
 159        batadv_bla_free(bat_priv);
 160
 161        free_percpu(bat_priv->bat_counters);
 162
 163        atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 164}
 165
 166void batadv_inc_module_count(void)
 167{
 168        try_module_get(THIS_MODULE);
 169}
 170
 171void batadv_dec_module_count(void)
 172{
 173        module_put(THIS_MODULE);
 174}
 175
 176int batadv_is_my_mac(const uint8_t *addr)
 177{
 178        const struct batadv_hard_iface *hard_iface;
 179
 180        rcu_read_lock();
 181        list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 182                if (hard_iface->if_status != BATADV_IF_ACTIVE)
 183                        continue;
 184
 185                if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
 186                        rcu_read_unlock();
 187                        return 1;
 188                }
 189        }
 190        rcu_read_unlock();
 191        return 0;
 192}
 193
 194static int batadv_recv_unhandled_packet(struct sk_buff *skb,
 195                                        struct batadv_hard_iface *recv_if)
 196{
 197        return NET_RX_DROP;
 198}
 199
 200/* incoming packets with the batman ethertype received on any active hard
 201 * interface
 202 */
 203int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 204                           struct packet_type *ptype,
 205                           struct net_device *orig_dev)
 206{
 207        struct batadv_priv *bat_priv;
 208        struct batadv_ogm_packet *batadv_ogm_packet;
 209        struct batadv_hard_iface *hard_iface;
 210        uint8_t idx;
 211        int ret;
 212
 213        hard_iface = container_of(ptype, struct batadv_hard_iface,
 214                                  batman_adv_ptype);
 215        skb = skb_share_check(skb, GFP_ATOMIC);
 216
 217        /* skb was released by skb_share_check() */
 218        if (!skb)
 219                goto err_out;
 220
 221        /* packet should hold at least type and version */
 222        if (unlikely(!pskb_may_pull(skb, 2)))
 223                goto err_free;
 224
 225        /* expect a valid ethernet header here. */
 226        if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
 227                goto err_free;
 228
 229        if (!hard_iface->soft_iface)
 230                goto err_free;
 231
 232        bat_priv = netdev_priv(hard_iface->soft_iface);
 233
 234        if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 235                goto err_free;
 236
 237        /* discard frames on not active interfaces */
 238        if (hard_iface->if_status != BATADV_IF_ACTIVE)
 239                goto err_free;
 240
 241        batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
 242
 243        if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
 244                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 245                           "Drop packet: incompatible batman version (%i)\n",
 246                           batadv_ogm_packet->header.version);
 247                goto err_free;
 248        }
 249
 250        /* all receive handlers return whether they received or reused
 251         * the supplied skb. if not, we have to free the skb.
 252         */
 253        idx = batadv_ogm_packet->header.packet_type;
 254        ret = (*batadv_rx_handler[idx])(skb, hard_iface);
 255
 256        if (ret == NET_RX_DROP)
 257                kfree_skb(skb);
 258
 259        /* return NET_RX_SUCCESS in any case as we
 260         * most probably dropped the packet for
 261         * routing-logical reasons.
 262         */
 263        return NET_RX_SUCCESS;
 264
 265err_free:
 266        kfree_skb(skb);
 267err_out:
 268        return NET_RX_DROP;
 269}
 270
 271static void batadv_recv_handler_init(void)
 272{
 273        int i;
 274
 275        for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
 276                batadv_rx_handler[i] = batadv_recv_unhandled_packet;
 277
 278        /* batman icmp packet */
 279        batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
 280        /* unicast packet */
 281        batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
 282        /* fragmented unicast packet */
 283        batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
 284        /* broadcast packet */
 285        batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
 286        /* vis packet */
 287        batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
 288        /* Translation table query (request or response) */
 289        batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
 290        /* Roaming advertisement */
 291        batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
 292}
 293
 294int
 295batadv_recv_handler_register(uint8_t packet_type,
 296                             int (*recv_handler)(struct sk_buff *,
 297                                                 struct batadv_hard_iface *))
 298{
 299        if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
 300                return -EBUSY;
 301
 302        batadv_rx_handler[packet_type] = recv_handler;
 303        return 0;
 304}
 305
 306void batadv_recv_handler_unregister(uint8_t packet_type)
 307{
 308        batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
 309}
 310
 311static struct batadv_algo_ops *batadv_algo_get(char *name)
 312{
 313        struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
 314        struct hlist_node *node;
 315
 316        hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) {
 317                if (strcmp(bat_algo_ops_tmp->name, name) != 0)
 318                        continue;
 319
 320                bat_algo_ops = bat_algo_ops_tmp;
 321                break;
 322        }
 323
 324        return bat_algo_ops;
 325}
 326
 327int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
 328{
 329        struct batadv_algo_ops *bat_algo_ops_tmp;
 330        int ret;
 331
 332        bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
 333        if (bat_algo_ops_tmp) {
 334                pr_info("Trying to register already registered routing algorithm: %s\n",
 335                        bat_algo_ops->name);
 336                ret = -EEXIST;
 337                goto out;
 338        }
 339
 340        /* all algorithms must implement all ops (for now) */
 341        if (!bat_algo_ops->bat_iface_enable ||
 342            !bat_algo_ops->bat_iface_disable ||
 343            !bat_algo_ops->bat_iface_update_mac ||
 344            !bat_algo_ops->bat_primary_iface_set ||
 345            !bat_algo_ops->bat_ogm_schedule ||
 346            !bat_algo_ops->bat_ogm_emit) {
 347                pr_info("Routing algo '%s' does not implement required ops\n",
 348                        bat_algo_ops->name);
 349                ret = -EINVAL;
 350                goto out;
 351        }
 352
 353        INIT_HLIST_NODE(&bat_algo_ops->list);
 354        hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
 355        ret = 0;
 356
 357out:
 358        return ret;
 359}
 360
 361int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
 362{
 363        struct batadv_algo_ops *bat_algo_ops;
 364        int ret = -EINVAL;
 365
 366        bat_algo_ops = batadv_algo_get(name);
 367        if (!bat_algo_ops)
 368                goto out;
 369
 370        bat_priv->bat_algo_ops = bat_algo_ops;
 371        ret = 0;
 372
 373out:
 374        return ret;
 375}
 376
 377int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
 378{
 379        struct batadv_algo_ops *bat_algo_ops;
 380        struct hlist_node *node;
 381
 382        seq_printf(seq, "Available routing algorithms:\n");
 383
 384        hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) {
 385                seq_printf(seq, "%s\n", bat_algo_ops->name);
 386        }
 387
 388        return 0;
 389}
 390
 391static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
 392{
 393        struct batadv_algo_ops *bat_algo_ops;
 394        char *algo_name = (char *)val;
 395        size_t name_len = strlen(algo_name);
 396
 397        if (algo_name[name_len - 1] == '\n')
 398                algo_name[name_len - 1] = '\0';
 399
 400        bat_algo_ops = batadv_algo_get(algo_name);
 401        if (!bat_algo_ops) {
 402                pr_err("Routing algorithm '%s' is not supported\n", algo_name);
 403                return -EINVAL;
 404        }
 405
 406        return param_set_copystring(algo_name, kp);
 407}
 408
 409static const struct kernel_param_ops batadv_param_ops_ra = {
 410        .set = batadv_param_set_ra,
 411        .get = param_get_string,
 412};
 413
 414static struct kparam_string batadv_param_string_ra = {
 415        .maxlen = sizeof(batadv_routing_algo),
 416        .string = batadv_routing_algo,
 417};
 418
 419module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
 420                0644);
 421module_init(batadv_init);
 422module_exit(batadv_exit);
 423
 424MODULE_LICENSE("GPL");
 425
 426MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
 427MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
 428MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
 429MODULE_VERSION(BATADV_SOURCE_VERSION);
 430
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