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        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
  77static 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
  90int 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
 136err:
 137        batadv_mesh_free(soft_iface);
 138        return ret;
 139}
 140
 141void 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
 163void batadv_inc_module_count(void)
 164{
 165        try_module_get(THIS_MODULE);
 166}
 167
 168void batadv_dec_module_count(void)
 169{
 170        module_put(THIS_MODULE);
 171}
 172
 173int 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
 191static 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 */
 200int 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
 262err_free:
 263        kfree_skb(skb);
 264err_out:
 265        return NET_RX_DROP;
 266}
 267
 268static 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
 291int
 292batadv_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
 303void batadv_recv_handler_unregister(uint8_t packet_type)
 304{
 305        batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
 306}
 307
 308static 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
 324int 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
 354out:
 355        return ret;
 356}
 357
 358int 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
 370out:
 371        return ret;
 372}
 373
 374int 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
 388static 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
 406static const struct kernel_param_ops batadv_param_ops_ra = {
 407        .set = batadv_param_set_ra,
 408        .get = param_get_string,
 409};
 410
 411static struct kparam_string batadv_param_string_ra = {
 412        .maxlen = sizeof(batadv_routing_algo),
 413        .string = batadv_routing_algo,
 414};
 415
 416module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
 417                0644);
 418module_init(batadv_init);
 419module_exit(batadv_exit);
 420
 421MODULE_LICENSE("GPL");
 422
 423MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
 424MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
 425MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
 426MODULE_VERSION(BATADV_SOURCE_VERSION);
 427
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