a3c7cd0cdf
Syzbot has reported some issues with the locking assumptions made for
the multicast tt/tvlv worker: It was able to trigger the WARN_ON() in
batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add().
While hard/not reproduceable for us so far it seems that the
delayed_work_pending() we use might not be quite safe from reordering.
Therefore this patch adds an explicit, new spinlock to protect the
update of the mla_list and flags in bat_priv and then removes the
WARN_ON(delayed_work_pending()).
Reported-by: syzbot+83f2d54ec6b7e417e13f@syzkaller.appspotmail.com
Reported-by: syzbot+050927a651272b145a5d@syzkaller.appspotmail.com
Reported-by: syzbot+979ffc89b87309b1b94b@syzkaller.appspotmail.com
Reported-by: syzbot+f9f3f388440283da2965@syzkaller.appspotmail.com
Fixes: cbebd363b2
("batman-adv: Use own timer for multicast TT and TVLV updates")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
693 lines
19 KiB
C
693 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2007-2019 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/build_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/genetlink.h>
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#include <linux/gfp.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/module.h>
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#include <linux/netdevice.h>
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#include <linux/printk.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/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 <uapi/linux/batadv_packet.h>
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#include <uapi/linux/batman_adv.h>
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#include "bat_algo.h"
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#include "bat_iv_ogm.h"
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#include "bat_v.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 "log.h"
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#include "multicast.h"
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#include "netlink.h"
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#include "network-coding.h"
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#include "originator.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 "tp_meter.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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unsigned int batadv_hardif_generation;
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static int (*batadv_rx_handler[256])(struct sk_buff *skb,
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struct batadv_hard_iface *recv_if);
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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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int ret;
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ret = batadv_tt_cache_init();
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if (ret < 0)
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return ret;
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INIT_LIST_HEAD(&batadv_hardif_list);
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batadv_algo_init();
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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_tp_meter_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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goto err_create_wq;
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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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batadv_netlink_register();
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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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err_create_wq:
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batadv_tt_cache_destroy();
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return -ENOMEM;
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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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batadv_netlink_unregister();
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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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batadv_tt_cache_destroy();
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}
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/**
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* batadv_mesh_init() - Initialize soft interface
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* @soft_iface: netdev struct of the soft interface
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*
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* Return: 0 on success or negative error number in case of failure
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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.mla_lock);
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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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spin_lock_init(&bat_priv->tp_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.gateway_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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INIT_HLIST_HEAD(&bat_priv->tp_list);
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bat_priv->gw.generation = 0;
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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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/**
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* batadv_mesh_free() - Deinitialize soft interface
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* @soft_iface: netdev struct of the soft interface
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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
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* real 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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#ifdef CONFIG_BATMAN_ADV_DEBUGFS
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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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#endif
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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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kfree_skb(skb);
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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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/**
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* batadv_batman_skb_recv() - Handle incoming message from an hard interface
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* @skb: the received packet
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* @dev: the net device that the packet was received on
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* @ptype: packet type of incoming packet (ETH_P_BATMAN)
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* @orig_dev: the original receive net device (e.g. bonded device)
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*
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* Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
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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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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)
|
|
goto err_free;
|
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
|
|
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
|
|
goto err_free;
|
|
|
|
/* discard frames on not active interfaces */
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE)
|
|
goto err_free;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
|
|
|
|
if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: incompatible batman version (%i)\n",
|
|
batadv_ogm_packet->version);
|
|
goto err_free;
|
|
}
|
|
|
|
/* reset control block to avoid left overs from previous users */
|
|
memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
|
|
|
|
idx = batadv_ogm_packet->packet_type;
|
|
(*batadv_rx_handler[idx])(skb, hard_iface);
|
|
|
|
batadv_hardif_put(hard_iface);
|
|
|
|
/* return NET_RX_SUCCESS in any case as we
|
|
* most probably dropped the packet for
|
|
* routing-logical reasons.
|
|
*/
|
|
return NET_RX_SUCCESS;
|
|
|
|
err_free:
|
|
kfree_skb(skb);
|
|
err_put:
|
|
batadv_hardif_put(hard_iface);
|
|
err_out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static void batadv_recv_handler_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
|
|
batadv_rx_handler[i] = batadv_recv_unhandled_packet;
|
|
|
|
for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
|
|
batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
|
|
|
|
/* 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);
|
|
|
|
i = FIELD_SIZEOF(struct sk_buff, cb);
|
|
BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/**
|
|
* batadv_recv_handler_register() - Register handler for batman-adv packet type
|
|
* @packet_type: batadv_packettype which should be handled
|
|
* @recv_handler: receive handler for the packet type
|
|
*
|
|
* Return: 0 on success or negative error number in case of failure
|
|
*/
|
|
int
|
|
batadv_recv_handler_register(u8 packet_type,
|
|
int (*recv_handler)(struct sk_buff *,
|
|
struct batadv_hard_iface *))
|
|
{
|
|
int (*curr)(struct sk_buff *skb,
|
|
struct batadv_hard_iface *recv_if);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* batadv_recv_handler_unregister() - Unregister handler for packet type
|
|
* @packet_type: batadv_packettype which should no longer be handled
|
|
*/
|
|
void batadv_recv_handler_unregister(u8 packet_type)
|
|
{
|
|
batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
|
|
}
|
|
|
|
/**
|
|
* 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_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 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;
|
|
}
|
|
|
|
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);
|
|
MODULE_ALIAS_RTNL_LINK("batadv");
|
|
MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);
|