| /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
| * |
| * Marek Lindner, Simon Wunderlich |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA |
| */ |
| |
| #include <linux/crc32c.h> |
| #include <linux/highmem.h> |
| #include "main.h" |
| #include "sysfs.h" |
| #include "debugfs.h" |
| #include "routing.h" |
| #include "send.h" |
| #include "originator.h" |
| #include "soft-interface.h" |
| #include "icmp_socket.h" |
| #include "translation-table.h" |
| #include "hard-interface.h" |
| #include "gateway_client.h" |
| #include "bridge_loop_avoidance.h" |
| #include "distributed-arp-table.h" |
| #include "vis.h" |
| #include "hash.h" |
| #include "bat_algo.h" |
| #include "network-coding.h" |
| |
| |
| /* List manipulations on hardif_list have to be rtnl_lock()'ed, |
| * list traversals just rcu-locked |
| */ |
| struct list_head batadv_hardif_list; |
| static int (*batadv_rx_handler[256])(struct sk_buff *, |
| struct batadv_hard_iface *); |
| char batadv_routing_algo[20] = "BATMAN_IV"; |
| static struct hlist_head batadv_algo_list; |
| |
| unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| |
| struct workqueue_struct *batadv_event_workqueue; |
| |
| static void batadv_recv_handler_init(void); |
| |
| static int __init batadv_init(void) |
| { |
| INIT_LIST_HEAD(&batadv_hardif_list); |
| INIT_HLIST_HEAD(&batadv_algo_list); |
| |
| batadv_recv_handler_init(); |
| |
| batadv_iv_init(); |
| batadv_nc_init(); |
| |
| batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
| |
| if (!batadv_event_workqueue) |
| return -ENOMEM; |
| |
| batadv_socket_init(); |
| batadv_debugfs_init(); |
| |
| register_netdevice_notifier(&batadv_hard_if_notifier); |
| rtnl_link_register(&batadv_link_ops); |
| |
| pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
| BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
| |
| return 0; |
| } |
| |
| static void __exit batadv_exit(void) |
| { |
| batadv_debugfs_destroy(); |
| rtnl_link_unregister(&batadv_link_ops); |
| unregister_netdevice_notifier(&batadv_hard_if_notifier); |
| batadv_hardif_remove_interfaces(); |
| |
| flush_workqueue(batadv_event_workqueue); |
| destroy_workqueue(batadv_event_workqueue); |
| batadv_event_workqueue = NULL; |
| |
| rcu_barrier(); |
| } |
| |
| int batadv_mesh_init(struct net_device *soft_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
| int ret; |
| |
| spin_lock_init(&bat_priv->forw_bat_list_lock); |
| spin_lock_init(&bat_priv->forw_bcast_list_lock); |
| spin_lock_init(&bat_priv->tt.changes_list_lock); |
| spin_lock_init(&bat_priv->tt.req_list_lock); |
| spin_lock_init(&bat_priv->tt.roam_list_lock); |
| spin_lock_init(&bat_priv->tt.last_changeset_lock); |
| spin_lock_init(&bat_priv->gw.list_lock); |
| spin_lock_init(&bat_priv->vis.hash_lock); |
| spin_lock_init(&bat_priv->vis.list_lock); |
| |
| INIT_HLIST_HEAD(&bat_priv->forw_bat_list); |
| INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); |
| INIT_HLIST_HEAD(&bat_priv->gw.list); |
| INIT_LIST_HEAD(&bat_priv->tt.changes_list); |
| INIT_LIST_HEAD(&bat_priv->tt.req_list); |
| INIT_LIST_HEAD(&bat_priv->tt.roam_list); |
| |
| ret = batadv_originator_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| ret = batadv_tt_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
| BATADV_NULL_IFINDEX); |
| |
| ret = batadv_vis_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| ret = batadv_bla_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| ret = batadv_dat_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| ret = batadv_nc_mesh_init(bat_priv); |
| if (ret < 0) |
| goto err; |
| |
| atomic_set(&bat_priv->gw.reselect, 0); |
| atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
| |
| return 0; |
| |
| err: |
| batadv_mesh_free(soft_iface); |
| return ret; |
| } |
| |
| void batadv_mesh_free(struct net_device *soft_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
| |
| atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
| |
| batadv_purge_outstanding_packets(bat_priv, NULL); |
| |
| batadv_vis_quit(bat_priv); |
| |
| batadv_gw_node_purge(bat_priv); |
| batadv_nc_mesh_free(bat_priv); |
| batadv_dat_free(bat_priv); |
| batadv_bla_free(bat_priv); |
| |
| /* Free the TT and the originator tables only after having terminated |
| * all the other depending components which may use these structures for |
| * their purposes. |
| */ |
| batadv_tt_free(bat_priv); |
| |
| /* Since the originator table clean up routine is accessing the TT |
| * tables as well, it has to be invoked after the TT tables have been |
| * freed and marked as empty. This ensures that no cleanup RCU callbacks |
| * accessing the TT data are scheduled for later execution. |
| */ |
| batadv_originator_free(bat_priv); |
| |
| free_percpu(bat_priv->bat_counters); |
| bat_priv->bat_counters = NULL; |
| |
| atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
| } |
| |
| /** |
| * batadv_is_my_mac - check if the given mac address belongs to any of the real |
| * interfaces in the current mesh |
| * @bat_priv: the bat priv with all the soft interface information |
| * @addr: the address to check |
| */ |
| int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
| { |
| const struct batadv_hard_iface *hard_iface; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| continue; |
| |
| if (hard_iface->soft_iface != bat_priv->soft_iface) |
| continue; |
| |
| if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
| rcu_read_unlock(); |
| return 1; |
| } |
| } |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| /** |
| * batadv_seq_print_text_primary_if_get - called from debugfs table printing |
| * function that requires the primary interface |
| * @seq: debugfs table seq_file struct |
| * |
| * Returns primary interface if found or NULL otherwise. |
| */ |
| struct batadv_hard_iface * |
| batadv_seq_print_text_primary_if_get(struct seq_file *seq) |
| { |
| struct net_device *net_dev = (struct net_device *)seq->private; |
| struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| struct batadv_hard_iface *primary_if; |
| |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| |
| if (!primary_if) { |
| seq_printf(seq, |
| "BATMAN mesh %s disabled - please specify interfaces to enable it\n", |
| net_dev->name); |
| goto out; |
| } |
| |
| if (primary_if->if_status == BATADV_IF_ACTIVE) |
| goto out; |
| |
| seq_printf(seq, |
| "BATMAN mesh %s disabled - primary interface not active\n", |
| net_dev->name); |
| batadv_hardif_free_ref(primary_if); |
| primary_if = NULL; |
| |
| out: |
| return primary_if; |
| } |
| |
| static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
| struct batadv_hard_iface *recv_if) |
| { |
| return NET_RX_DROP; |
| } |
| |
| /* incoming packets with the batman ethertype received on any active hard |
| * interface |
| */ |
| int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *ptype, |
| struct net_device *orig_dev) |
| { |
| struct batadv_priv *bat_priv; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct batadv_hard_iface *hard_iface; |
| uint8_t idx; |
| int ret; |
| |
| hard_iface = container_of(ptype, struct batadv_hard_iface, |
| batman_adv_ptype); |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| |
| /* skb was released by skb_share_check() */ |
| if (!skb) |
| goto err_out; |
| |
| /* packet should hold at least type and version */ |
| if (unlikely(!pskb_may_pull(skb, 2))) |
| goto err_free; |
| |
| /* expect a valid ethernet header here. */ |
| if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) |
| goto err_free; |
| |
| if (!hard_iface->soft_iface) |
| goto err_free; |
| |
| bat_priv = netdev_priv(hard_iface->soft_iface); |
| |
| if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
| goto err_free; |
| |
| /* discard frames on not active interfaces */ |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| goto err_free; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
| |
| if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: incompatible batman version (%i)\n", |
| batadv_ogm_packet->header.version); |
| goto err_free; |
| } |
| |
| /* all receive handlers return whether they received or reused |
| * the supplied skb. if not, we have to free the skb. |
| */ |
| idx = batadv_ogm_packet->header.packet_type; |
| ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
| |
| if (ret == NET_RX_DROP) |
| kfree_skb(skb); |
| |
| /* return NET_RX_SUCCESS in any case as we |
| * most probably dropped the packet for |
| * routing-logical reasons. |
| */ |
| return NET_RX_SUCCESS; |
| |
| err_free: |
| kfree_skb(skb); |
| err_out: |
| return NET_RX_DROP; |
| } |
| |
| static void batadv_recv_handler_init(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
| batadv_rx_handler[i] = batadv_recv_unhandled_packet; |
| |
| /* batman icmp packet */ |
| batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
| /* unicast with 4 addresses packet */ |
| batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; |
| /* unicast packet */ |
| batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
| /* fragmented unicast packet */ |
| batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
| /* broadcast packet */ |
| batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
| /* vis packet */ |
| batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; |
| /* Translation table query (request or response) */ |
| batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; |
| /* Roaming advertisement */ |
| batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; |
| } |
| |
| int |
| batadv_recv_handler_register(uint8_t packet_type, |
| int (*recv_handler)(struct sk_buff *, |
| struct batadv_hard_iface *)) |
| { |
| if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) |
| return -EBUSY; |
| |
| batadv_rx_handler[packet_type] = recv_handler; |
| return 0; |
| } |
| |
| void batadv_recv_handler_unregister(uint8_t packet_type) |
| { |
| batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
| } |
| |
| static struct batadv_algo_ops *batadv_algo_get(char *name) |
| { |
| struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
| |
| hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
| if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
| continue; |
| |
| bat_algo_ops = bat_algo_ops_tmp; |
| break; |
| } |
| |
| return bat_algo_ops; |
| } |
| |
| int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
| { |
| struct batadv_algo_ops *bat_algo_ops_tmp; |
| int ret; |
| |
| bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
| if (bat_algo_ops_tmp) { |
| pr_info("Trying to register already registered routing algorithm: %s\n", |
| bat_algo_ops->name); |
| ret = -EEXIST; |
| goto out; |
| } |
| |
| /* all algorithms must implement all ops (for now) */ |
| if (!bat_algo_ops->bat_iface_enable || |
| !bat_algo_ops->bat_iface_disable || |
| !bat_algo_ops->bat_iface_update_mac || |
| !bat_algo_ops->bat_primary_iface_set || |
| !bat_algo_ops->bat_ogm_schedule || |
| !bat_algo_ops->bat_ogm_emit) { |
| pr_info("Routing algo '%s' does not implement required ops\n", |
| bat_algo_ops->name); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| INIT_HLIST_NODE(&bat_algo_ops->list); |
| hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
| ret = 0; |
| |
| out: |
| return ret; |
| } |
| |
| int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
| { |
| struct batadv_algo_ops *bat_algo_ops; |
| int ret = -EINVAL; |
| |
| bat_algo_ops = batadv_algo_get(name); |
| if (!bat_algo_ops) |
| goto out; |
| |
| bat_priv->bat_algo_ops = bat_algo_ops; |
| ret = 0; |
| |
| out: |
| return ret; |
| } |
| |
| int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
| { |
| struct batadv_algo_ops *bat_algo_ops; |
| |
| seq_puts(seq, "Available routing algorithms:\n"); |
| |
| hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
| seq_printf(seq, "%s\n", bat_algo_ops->name); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in |
| * the header |
| * @skb: skb pointing to fragmented socket buffers |
| * @payload_ptr: Pointer to position inside the head buffer of the skb |
| * marking the start of the data to be CRC'ed |
| * |
| * payload_ptr must always point to an address in the skb head buffer and not to |
| * a fragment. |
| */ |
| __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) |
| { |
| u32 crc = 0; |
| unsigned int from; |
| unsigned int to = skb->len; |
| struct skb_seq_state st; |
| const u8 *data; |
| unsigned int len; |
| unsigned int consumed = 0; |
| |
| from = (unsigned int)(payload_ptr - skb->data); |
| |
| skb_prepare_seq_read(skb, from, to, &st); |
| while ((len = skb_seq_read(consumed, &data, &st)) != 0) { |
| crc = crc32c(crc, data, len); |
| consumed += len; |
| } |
| skb_abort_seq_read(&st); |
| |
| return htonl(crc); |
| } |
| |
| static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
| { |
| struct batadv_algo_ops *bat_algo_ops; |
| char *algo_name = (char *)val; |
| size_t name_len = strlen(algo_name); |
| |
| if (name_len > 0 && algo_name[name_len - 1] == '\n') |
| algo_name[name_len - 1] = '\0'; |
| |
| bat_algo_ops = batadv_algo_get(algo_name); |
| if (!bat_algo_ops) { |
| pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
| return -EINVAL; |
| } |
| |
| return param_set_copystring(algo_name, kp); |
| } |
| |
| static const struct kernel_param_ops batadv_param_ops_ra = { |
| .set = batadv_param_set_ra, |
| .get = param_get_string, |
| }; |
| |
| static struct kparam_string batadv_param_string_ra = { |
| .maxlen = sizeof(batadv_routing_algo), |
| .string = batadv_routing_algo, |
| }; |
| |
| module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
| 0644); |
| module_init(batadv_init); |
| module_exit(batadv_exit); |
| |
| MODULE_LICENSE("GPL"); |
| |
| MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(BATADV_DRIVER_DESC); |
| MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); |
| MODULE_VERSION(BATADV_SOURCE_VERSION); |