![Sven Eckelmann](/assets/img/avatar_default.png)
batadv_tvlv_container_get requires that tvlv.container_list_lock is held by the caller. It is therefore not possible that an item in tvlv.container_list has an reference counter of 0 and is still in the list The kref_get function instead WARNs (with debug information) when the reference counter would still be 0. This makes a bug in batman-adv better visible because kref_get_unless_zero would have ignored this problem. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <a@unstable.cc>
1326 lines
38 KiB
C
1326 lines
38 KiB
C
/* Copyright (C) 2007-2016 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bug.h>
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#include <linux/byteorder/generic.h>
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#include <linux/crc32c.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <linux/pkt_sched.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/seq_file.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/workqueue.h>
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#include <net/dsfield.h>
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#include <net/rtnetlink.h>
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#include "bat_algo.h"
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#include "bridge_loop_avoidance.h"
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#include "debugfs.h"
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#include "distributed-arp-table.h"
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#include "gateway_client.h"
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#include "gateway_common.h"
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#include "hard-interface.h"
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#include "icmp_socket.h"
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#include "multicast.h"
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#include "network-coding.h"
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#include "originator.h"
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#include "packet.h"
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#include "routing.h"
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#include "send.h"
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#include "soft-interface.h"
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#include "translation-table.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_v_init();
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batadv_iv_init();
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batadv_nc_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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rtnl_link_register(&batadv_link_ops);
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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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rtnl_link_unregister(&batadv_link_ops);
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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->tt.commit_lock);
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spin_lock_init(&bat_priv->gw.list_lock);
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#ifdef CONFIG_BATMAN_ADV_MCAST
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spin_lock_init(&bat_priv->mcast.want_lists_lock);
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#endif
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spin_lock_init(&bat_priv->tvlv.container_list_lock);
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spin_lock_init(&bat_priv->tvlv.handler_list_lock);
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spin_lock_init(&bat_priv->softif_vlan_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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#ifdef CONFIG_BATMAN_ADV_MCAST
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INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
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INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
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INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
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#endif
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INIT_LIST_HEAD(&bat_priv->tt.changes_list);
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INIT_HLIST_HEAD(&bat_priv->tt.req_list);
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INIT_LIST_HEAD(&bat_priv->tt.roam_list);
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#ifdef CONFIG_BATMAN_ADV_MCAST
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INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
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#endif
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INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
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INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
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INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
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ret = batadv_v_mesh_init(bat_priv);
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if (ret < 0)
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goto err;
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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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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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ret = batadv_nc_mesh_init(bat_priv);
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if (ret < 0)
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goto err;
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batadv_gw_init(bat_priv);
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batadv_mcast_init(bat_priv);
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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_gw_node_free(bat_priv);
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batadv_v_mesh_free(bat_priv);
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batadv_nc_mesh_free(bat_priv);
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batadv_dat_free(bat_priv);
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batadv_bla_free(bat_priv);
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batadv_mcast_free(bat_priv);
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/* Free the TT and the originator tables only after having terminated
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* all the other depending components which may use these structures for
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* their purposes.
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*/
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batadv_tt_free(bat_priv);
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/* Since the originator table clean up routine is accessing the TT
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* tables as well, it has to be invoked after the TT tables have been
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* freed and marked as empty. This ensures that no cleanup RCU callbacks
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* accessing the TT data are scheduled for later execution.
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*/
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batadv_originator_free(bat_priv);
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batadv_gw_free(bat_priv);
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free_percpu(bat_priv->bat_counters);
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bat_priv->bat_counters = NULL;
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atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
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}
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/**
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* batadv_is_my_mac - check if the given mac address belongs to any of the real
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* interfaces in the current mesh
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the address to check
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*
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* Return: 'true' if the mac address was found, false otherwise.
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*/
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bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
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{
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const struct batadv_hard_iface *hard_iface;
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bool is_my_mac = false;
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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 (hard_iface->soft_iface != bat_priv->soft_iface)
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continue;
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if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
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is_my_mac = true;
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break;
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}
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}
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rcu_read_unlock();
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return is_my_mac;
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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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* Return: 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_put(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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/**
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* batadv_max_header_len - calculate maximum encapsulation overhead for a
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* payload packet
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*
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* Return: the maximum encapsulation overhead in bytes.
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*/
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int batadv_max_header_len(void)
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{
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int header_len = 0;
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header_len = max_t(int, header_len,
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sizeof(struct batadv_unicast_packet));
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header_len = max_t(int, header_len,
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sizeof(struct batadv_unicast_4addr_packet));
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header_len = max_t(int, header_len,
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sizeof(struct batadv_bcast_packet));
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#ifdef CONFIG_BATMAN_ADV_NC
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header_len = max_t(int, header_len,
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sizeof(struct batadv_coded_packet));
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#endif
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return header_len + ETH_HLEN;
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}
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/**
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* batadv_skb_set_priority - sets skb priority according to packet content
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* @skb: the packet to be sent
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* @offset: offset to the packet content
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*
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* This function sets a value between 256 and 263 (802.1d priority), which
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* can be interpreted by the cfg80211 or other drivers.
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*/
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void batadv_skb_set_priority(struct sk_buff *skb, int offset)
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{
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struct iphdr ip_hdr_tmp, *ip_hdr;
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struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
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struct ethhdr ethhdr_tmp, *ethhdr;
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struct vlan_ethhdr *vhdr, vhdr_tmp;
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u32 prio;
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/* already set, do nothing */
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if (skb->priority >= 256 && skb->priority <= 263)
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return;
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ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp);
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if (!ethhdr)
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return;
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switch (ethhdr->h_proto) {
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case htons(ETH_P_8021Q):
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vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
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sizeof(*vhdr), &vhdr_tmp);
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if (!vhdr)
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return;
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prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
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prio = prio >> VLAN_PRIO_SHIFT;
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break;
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case htons(ETH_P_IP):
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ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
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sizeof(*ip_hdr), &ip_hdr_tmp);
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if (!ip_hdr)
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return;
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prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
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break;
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case htons(ETH_P_IPV6):
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ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
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sizeof(*ip6_hdr), &ip6_hdr_tmp);
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if (!ip6_hdr)
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return;
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prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
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break;
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default:
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return;
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}
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skb->priority = prio + 256;
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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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u8 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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/* Prevent processing a packet received on an interface which is getting
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* shut down otherwise the packet may trigger de-reference errors
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* further down in the receive path.
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*/
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if (!kref_get_unless_zero(&hard_iface->refcount))
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goto err_out;
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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_put;
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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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|
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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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|
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if (batadv_ogm_packet->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->version);
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goto err_free;
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}
|
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|
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/* reset control block to avoid left overs from previous users */
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memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
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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->packet_type;
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ret = (*batadv_rx_handler[idx])(skb, hard_iface);
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|
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if (ret == NET_RX_DROP)
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kfree_skb(skb);
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|
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batadv_hardif_put(hard_iface);
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|
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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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|
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err_free:
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kfree_skb(skb);
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err_put:
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batadv_hardif_put(hard_iface);
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err_out:
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return NET_RX_DROP;
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}
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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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|
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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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|
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for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
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batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
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|
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/* compile time checks for sizes */
|
|
BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
|
|
BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
|
|
BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
|
|
BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
|
|
BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
|
|
BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
|
|
BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
|
|
BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
|
|
BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
|
|
BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
|
|
BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
|
|
BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
|
|
BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
|
|
BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
|
|
BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
|
|
BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
|
|
|
|
/* broadcast packet */
|
|
batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
|
|
|
|
/* unicast packets ... */
|
|
/* 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;
|
|
/* unicast tvlv packet */
|
|
batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
|
|
/* batman icmp packet */
|
|
batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
|
|
/* Fragmented packets */
|
|
batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
|
|
}
|
|
|
|
int
|
|
batadv_recv_handler_register(u8 packet_type,
|
|
int (*recv_handler)(struct sk_buff *,
|
|
struct batadv_hard_iface *))
|
|
{
|
|
int (*curr)(struct sk_buff *,
|
|
struct batadv_hard_iface *);
|
|
curr = batadv_rx_handler[packet_type];
|
|
|
|
if ((curr != batadv_recv_unhandled_packet) &&
|
|
(curr != batadv_recv_unhandled_unicast_packet))
|
|
return -EBUSY;
|
|
|
|
batadv_rx_handler[packet_type] = recv_handler;
|
|
return 0;
|
|
}
|
|
|
|
void batadv_recv_handler_unregister(u8 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;
|
|
|
|
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);
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* 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 ||
|
|
!bat_algo_ops->bat_neigh_cmp ||
|
|
!bat_algo_ops->bat_neigh_is_similar_or_better) {
|
|
pr_info("Routing algo '%s' does not implement required ops\n",
|
|
bat_algo_ops->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
INIT_HLIST_NODE(&bat_algo_ops->list);
|
|
hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
|
|
{
|
|
struct batadv_algo_ops *bat_algo_ops;
|
|
|
|
bat_algo_ops = batadv_algo_get(name);
|
|
if (!bat_algo_ops)
|
|
return -EINVAL;
|
|
|
|
bat_priv->bat_algo_ops = bat_algo_ops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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.
|
|
*
|
|
* Return: big endian crc32c of the checksummed data
|
|
*/
|
|
__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;
|
|
}
|
|
|
|
return htonl(crc);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_handler_release - release tvlv handler from lists and queue for
|
|
* free after rcu grace period
|
|
* @ref: kref pointer of the tvlv
|
|
*/
|
|
static void batadv_tvlv_handler_release(struct kref *ref)
|
|
{
|
|
struct batadv_tvlv_handler *tvlv_handler;
|
|
|
|
tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
|
|
kfree_rcu(tvlv_handler, rcu);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_handler_put - decrement the tvlv container refcounter and
|
|
* possibly release it
|
|
* @tvlv_handler: the tvlv handler to free
|
|
*/
|
|
static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
|
|
{
|
|
kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
|
|
* based on the provided type and version (both need to match)
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @type: tvlv handler type to look for
|
|
* @version: tvlv handler version to look for
|
|
*
|
|
* Return: tvlv handler if found or NULL otherwise.
|
|
*/
|
|
static struct batadv_tvlv_handler *
|
|
batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
|
|
{
|
|
struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tvlv_handler_tmp,
|
|
&bat_priv->tvlv.handler_list, list) {
|
|
if (tvlv_handler_tmp->type != type)
|
|
continue;
|
|
|
|
if (tvlv_handler_tmp->version != version)
|
|
continue;
|
|
|
|
if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
|
|
continue;
|
|
|
|
tvlv_handler = tvlv_handler_tmp;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return tvlv_handler;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_release - release tvlv from lists and free
|
|
* @ref: kref pointer of the tvlv
|
|
*/
|
|
static void batadv_tvlv_container_release(struct kref *ref)
|
|
{
|
|
struct batadv_tvlv_container *tvlv;
|
|
|
|
tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
|
|
kfree(tvlv);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_put - decrement the tvlv container refcounter and
|
|
* possibly release it
|
|
* @tvlv: the tvlv container to free
|
|
*/
|
|
static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
|
|
{
|
|
kref_put(&tvlv->refcount, batadv_tvlv_container_release);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
|
|
* list based on the provided type and version (both need to match)
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @type: tvlv container type to look for
|
|
* @version: tvlv container version to look for
|
|
*
|
|
* Has to be called with the appropriate locks being acquired
|
|
* (tvlv.container_list_lock).
|
|
*
|
|
* Return: tvlv container if found or NULL otherwise.
|
|
*/
|
|
static struct batadv_tvlv_container *
|
|
batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
|
|
{
|
|
struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
|
|
|
|
lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
|
|
|
|
hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
|
|
if (tvlv_tmp->tvlv_hdr.type != type)
|
|
continue;
|
|
|
|
if (tvlv_tmp->tvlv_hdr.version != version)
|
|
continue;
|
|
|
|
kref_get(&tvlv_tmp->refcount);
|
|
tvlv = tvlv_tmp;
|
|
break;
|
|
}
|
|
|
|
return tvlv;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_list_size - calculate the size of the tvlv container
|
|
* list entries
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Has to be called with the appropriate locks being acquired
|
|
* (tvlv.container_list_lock).
|
|
*
|
|
* Return: size of all currently registered tvlv containers in bytes.
|
|
*/
|
|
static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_tvlv_container *tvlv;
|
|
u16 tvlv_len = 0;
|
|
|
|
lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
|
|
|
|
hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
|
|
tvlv_len += sizeof(struct batadv_tvlv_hdr);
|
|
tvlv_len += ntohs(tvlv->tvlv_hdr.len);
|
|
}
|
|
|
|
return tvlv_len;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_remove - remove tvlv container from the tvlv container
|
|
* list
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tvlv: the to be removed tvlv container
|
|
*
|
|
* Has to be called with the appropriate locks being acquired
|
|
* (tvlv.container_list_lock).
|
|
*/
|
|
static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_container *tvlv)
|
|
{
|
|
lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
|
|
|
|
if (!tvlv)
|
|
return;
|
|
|
|
hlist_del(&tvlv->list);
|
|
|
|
/* first call to decrement the counter, second call to free */
|
|
batadv_tvlv_container_put(tvlv);
|
|
batadv_tvlv_container_put(tvlv);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_unregister - unregister tvlv container based on the
|
|
* provided type and version (both need to match)
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @type: tvlv container type to unregister
|
|
* @version: tvlv container type to unregister
|
|
*/
|
|
void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
|
|
u8 type, u8 version)
|
|
{
|
|
struct batadv_tvlv_container *tvlv;
|
|
|
|
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
|
|
tvlv = batadv_tvlv_container_get(bat_priv, type, version);
|
|
batadv_tvlv_container_remove(bat_priv, tvlv);
|
|
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_register - register tvlv type, version and content
|
|
* to be propagated with each (primary interface) OGM
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @type: tvlv container type
|
|
* @version: tvlv container version
|
|
* @tvlv_value: tvlv container content
|
|
* @tvlv_value_len: tvlv container content length
|
|
*
|
|
* If a container of the same type and version was already registered the new
|
|
* content is going to replace the old one.
|
|
*/
|
|
void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
|
|
u8 type, u8 version,
|
|
void *tvlv_value, u16 tvlv_value_len)
|
|
{
|
|
struct batadv_tvlv_container *tvlv_old, *tvlv_new;
|
|
|
|
if (!tvlv_value)
|
|
tvlv_value_len = 0;
|
|
|
|
tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
|
|
if (!tvlv_new)
|
|
return;
|
|
|
|
tvlv_new->tvlv_hdr.version = version;
|
|
tvlv_new->tvlv_hdr.type = type;
|
|
tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
|
|
|
|
memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
|
|
INIT_HLIST_NODE(&tvlv_new->list);
|
|
kref_init(&tvlv_new->refcount);
|
|
|
|
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
|
|
tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
|
|
batadv_tvlv_container_remove(bat_priv, tvlv_old);
|
|
hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
|
|
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
|
|
* requested packet size
|
|
* @packet_buff: packet buffer
|
|
* @packet_buff_len: packet buffer size
|
|
* @min_packet_len: requested packet minimum size
|
|
* @additional_packet_len: requested additional packet size on top of minimum
|
|
* size
|
|
*
|
|
* Return: true of the packet buffer could be changed to the requested size,
|
|
* false otherwise.
|
|
*/
|
|
static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
|
|
int *packet_buff_len,
|
|
int min_packet_len,
|
|
int additional_packet_len)
|
|
{
|
|
unsigned char *new_buff;
|
|
|
|
new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
|
|
|
|
/* keep old buffer if kmalloc should fail */
|
|
if (!new_buff)
|
|
return false;
|
|
|
|
memcpy(new_buff, *packet_buff, min_packet_len);
|
|
kfree(*packet_buff);
|
|
*packet_buff = new_buff;
|
|
*packet_buff_len = min_packet_len + additional_packet_len;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_container_ogm_append - append tvlv container content to given
|
|
* OGM packet buffer
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @packet_buff: ogm packet buffer
|
|
* @packet_buff_len: ogm packet buffer size including ogm header and tvlv
|
|
* content
|
|
* @packet_min_len: ogm header size to be preserved for the OGM itself
|
|
*
|
|
* The ogm packet might be enlarged or shrunk depending on the current size
|
|
* and the size of the to-be-appended tvlv containers.
|
|
*
|
|
* Return: size of all appended tvlv containers in bytes.
|
|
*/
|
|
u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
|
|
unsigned char **packet_buff,
|
|
int *packet_buff_len, int packet_min_len)
|
|
{
|
|
struct batadv_tvlv_container *tvlv;
|
|
struct batadv_tvlv_hdr *tvlv_hdr;
|
|
u16 tvlv_value_len;
|
|
void *tvlv_value;
|
|
bool ret;
|
|
|
|
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
|
|
tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
|
|
|
|
ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
|
|
packet_min_len, tvlv_value_len);
|
|
|
|
if (!ret)
|
|
goto end;
|
|
|
|
if (!tvlv_value_len)
|
|
goto end;
|
|
|
|
tvlv_value = (*packet_buff) + packet_min_len;
|
|
|
|
hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
|
|
tvlv_hdr = tvlv_value;
|
|
tvlv_hdr->type = tvlv->tvlv_hdr.type;
|
|
tvlv_hdr->version = tvlv->tvlv_hdr.version;
|
|
tvlv_hdr->len = tvlv->tvlv_hdr.len;
|
|
tvlv_value = tvlv_hdr + 1;
|
|
memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
|
|
tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
|
|
}
|
|
|
|
end:
|
|
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
|
|
return tvlv_value_len;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_call_handler - parse the given tvlv buffer to call the
|
|
* appropriate handlers
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tvlv_handler: tvlv callback function handling the tvlv content
|
|
* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
|
|
* @orig_node: orig node emitting the ogm packet
|
|
* @src: source mac address of the unicast packet
|
|
* @dst: destination mac address of the unicast packet
|
|
* @tvlv_value: tvlv content
|
|
* @tvlv_value_len: tvlv content length
|
|
*
|
|
* Return: success if handler was not found or the return value of the handler
|
|
* callback.
|
|
*/
|
|
static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_handler *tvlv_handler,
|
|
bool ogm_source,
|
|
struct batadv_orig_node *orig_node,
|
|
u8 *src, u8 *dst,
|
|
void *tvlv_value, u16 tvlv_value_len)
|
|
{
|
|
if (!tvlv_handler)
|
|
return NET_RX_SUCCESS;
|
|
|
|
if (ogm_source) {
|
|
if (!tvlv_handler->ogm_handler)
|
|
return NET_RX_SUCCESS;
|
|
|
|
if (!orig_node)
|
|
return NET_RX_SUCCESS;
|
|
|
|
tvlv_handler->ogm_handler(bat_priv, orig_node,
|
|
BATADV_NO_FLAGS,
|
|
tvlv_value, tvlv_value_len);
|
|
tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
|
|
} else {
|
|
if (!src)
|
|
return NET_RX_SUCCESS;
|
|
|
|
if (!dst)
|
|
return NET_RX_SUCCESS;
|
|
|
|
if (!tvlv_handler->unicast_handler)
|
|
return NET_RX_SUCCESS;
|
|
|
|
return tvlv_handler->unicast_handler(bat_priv, src,
|
|
dst, tvlv_value,
|
|
tvlv_value_len);
|
|
}
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_containers_process - parse the given tvlv buffer to call the
|
|
* appropriate handlers
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
|
|
* @orig_node: orig node emitting the ogm packet
|
|
* @src: source mac address of the unicast packet
|
|
* @dst: destination mac address of the unicast packet
|
|
* @tvlv_value: tvlv content
|
|
* @tvlv_value_len: tvlv content length
|
|
*
|
|
* Return: success when processing an OGM or the return value of all called
|
|
* handler callbacks.
|
|
*/
|
|
int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
|
|
bool ogm_source,
|
|
struct batadv_orig_node *orig_node,
|
|
u8 *src, u8 *dst,
|
|
void *tvlv_value, u16 tvlv_value_len)
|
|
{
|
|
struct batadv_tvlv_handler *tvlv_handler;
|
|
struct batadv_tvlv_hdr *tvlv_hdr;
|
|
u16 tvlv_value_cont_len;
|
|
u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
|
|
int ret = NET_RX_SUCCESS;
|
|
|
|
while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
|
|
tvlv_hdr = tvlv_value;
|
|
tvlv_value_cont_len = ntohs(tvlv_hdr->len);
|
|
tvlv_value = tvlv_hdr + 1;
|
|
tvlv_value_len -= sizeof(*tvlv_hdr);
|
|
|
|
if (tvlv_value_cont_len > tvlv_value_len)
|
|
break;
|
|
|
|
tvlv_handler = batadv_tvlv_handler_get(bat_priv,
|
|
tvlv_hdr->type,
|
|
tvlv_hdr->version);
|
|
|
|
ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
|
|
ogm_source, orig_node,
|
|
src, dst, tvlv_value,
|
|
tvlv_value_cont_len);
|
|
if (tvlv_handler)
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
|
|
tvlv_value_len -= tvlv_value_cont_len;
|
|
}
|
|
|
|
if (!ogm_source)
|
|
return ret;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tvlv_handler,
|
|
&bat_priv->tvlv.handler_list, list) {
|
|
if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
|
|
!(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
|
|
tvlv_handler->ogm_handler(bat_priv, orig_node,
|
|
cifnotfound, NULL, 0);
|
|
|
|
tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
|
|
* handlers
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @batadv_ogm_packet: ogm packet containing the tvlv containers
|
|
* @orig_node: orig node emitting the ogm packet
|
|
*/
|
|
void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
struct batadv_orig_node *orig_node)
|
|
{
|
|
void *tvlv_value;
|
|
u16 tvlv_value_len;
|
|
|
|
if (!batadv_ogm_packet)
|
|
return;
|
|
|
|
tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
|
|
if (!tvlv_value_len)
|
|
return;
|
|
|
|
tvlv_value = batadv_ogm_packet + 1;
|
|
|
|
batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
|
|
tvlv_value, tvlv_value_len);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_handler_register - register tvlv handler based on the provided
|
|
* type and version (both need to match) for ogm tvlv payload and/or unicast
|
|
* payload
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @optr: ogm tvlv handler callback function. This function receives the orig
|
|
* node, flags and the tvlv content as argument to process.
|
|
* @uptr: unicast tvlv handler callback function. This function receives the
|
|
* source & destination of the unicast packet as well as the tvlv content
|
|
* to process.
|
|
* @type: tvlv handler type to be registered
|
|
* @version: tvlv handler version to be registered
|
|
* @flags: flags to enable or disable TVLV API behavior
|
|
*/
|
|
void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
|
|
void (*optr)(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 flags,
|
|
void *tvlv_value,
|
|
u16 tvlv_value_len),
|
|
int (*uptr)(struct batadv_priv *bat_priv,
|
|
u8 *src, u8 *dst,
|
|
void *tvlv_value,
|
|
u16 tvlv_value_len),
|
|
u8 type, u8 version, u8 flags)
|
|
{
|
|
struct batadv_tvlv_handler *tvlv_handler;
|
|
|
|
tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
|
|
if (tvlv_handler) {
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
return;
|
|
}
|
|
|
|
tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
|
|
if (!tvlv_handler)
|
|
return;
|
|
|
|
tvlv_handler->ogm_handler = optr;
|
|
tvlv_handler->unicast_handler = uptr;
|
|
tvlv_handler->type = type;
|
|
tvlv_handler->version = version;
|
|
tvlv_handler->flags = flags;
|
|
kref_init(&tvlv_handler->refcount);
|
|
INIT_HLIST_NODE(&tvlv_handler->list);
|
|
|
|
spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
|
|
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_handler_unregister - unregister tvlv handler based on the
|
|
* provided type and version (both need to match)
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @type: tvlv handler type to be unregistered
|
|
* @version: tvlv handler version to be unregistered
|
|
*/
|
|
void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
|
|
u8 type, u8 version)
|
|
{
|
|
struct batadv_tvlv_handler *tvlv_handler;
|
|
|
|
tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
|
|
if (!tvlv_handler)
|
|
return;
|
|
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
hlist_del_rcu(&tvlv_handler->list);
|
|
spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
|
|
batadv_tvlv_handler_put(tvlv_handler);
|
|
}
|
|
|
|
/**
|
|
* batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
|
|
* specified host
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @src: source mac address of the unicast packet
|
|
* @dst: destination mac address of the unicast packet
|
|
* @type: tvlv type
|
|
* @version: tvlv version
|
|
* @tvlv_value: tvlv content
|
|
* @tvlv_value_len: tvlv content length
|
|
*/
|
|
void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
|
|
u8 *dst, u8 type, u8 version,
|
|
void *tvlv_value, u16 tvlv_value_len)
|
|
{
|
|
struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
|
|
struct batadv_tvlv_hdr *tvlv_hdr;
|
|
struct batadv_orig_node *orig_node;
|
|
struct sk_buff *skb;
|
|
unsigned char *tvlv_buff;
|
|
unsigned int tvlv_len;
|
|
ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, dst);
|
|
if (!orig_node)
|
|
return;
|
|
|
|
tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
|
|
|
|
skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
skb_reserve(skb, ETH_HLEN);
|
|
tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
|
|
unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
|
|
unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
|
|
unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
|
|
unicast_tvlv_packet->ttl = BATADV_TTL;
|
|
unicast_tvlv_packet->reserved = 0;
|
|
unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
|
|
unicast_tvlv_packet->align = 0;
|
|
ether_addr_copy(unicast_tvlv_packet->src, src);
|
|
ether_addr_copy(unicast_tvlv_packet->dst, dst);
|
|
|
|
tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
|
|
tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
|
|
tvlv_hdr->version = version;
|
|
tvlv_hdr->type = type;
|
|
tvlv_hdr->len = htons(tvlv_value_len);
|
|
tvlv_buff += sizeof(*tvlv_hdr);
|
|
memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
|
|
|
|
if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP)
|
|
kfree_skb(skb);
|
|
out:
|
|
batadv_orig_node_put(orig_node);
|
|
}
|
|
|
|
/**
|
|
* batadv_get_vid - extract the VLAN identifier from skb if any
|
|
* @skb: the buffer containing the packet
|
|
* @header_len: length of the batman header preceding the ethernet header
|
|
*
|
|
* Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
|
|
* skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
|
|
*/
|
|
unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
|
|
{
|
|
struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
|
|
struct vlan_ethhdr *vhdr;
|
|
unsigned short vid;
|
|
|
|
if (ethhdr->h_proto != htons(ETH_P_8021Q))
|
|
return BATADV_NO_FLAGS;
|
|
|
|
if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
|
|
return BATADV_NO_FLAGS;
|
|
|
|
vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
|
|
vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
|
|
vid |= BATADV_VLAN_HAS_TAG;
|
|
|
|
return vid;
|
|
}
|
|
|
|
/**
|
|
* batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @vid: the VLAN identifier for which the AP isolation attributed as to be
|
|
* looked up
|
|
*
|
|
* Return: true if AP isolation is on for the VLAN idenfied by vid, false
|
|
* otherwise
|
|
*/
|
|
bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
|
|
{
|
|
bool ap_isolation_enabled = false;
|
|
struct batadv_softif_vlan *vlan;
|
|
|
|
/* if the AP isolation is requested on a VLAN, then check for its
|
|
* setting in the proper VLAN private data structure
|
|
*/
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid);
|
|
if (vlan) {
|
|
ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
|
|
batadv_softif_vlan_put(vlan);
|
|
}
|
|
|
|
return ap_isolation_enabled;
|
|
}
|
|
|
|
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);
|