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