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![Marek Lindner](/assets/img/avatar_default.png)
The backbone_gw refcounter is to be decreased by the queued work and currently is never decreased if the queue_work() call fails. Fix by checking the queue_work() return value and decrease refcount if necessary. Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2537 lines
70 KiB
C
2537 lines
70 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors:
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*
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* 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 "bridge_loop_avoidance.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/byteorder/generic.h>
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#include <linux/compiler.h>
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#include <linux/crc16.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/gfp.h>
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#include <linux/if_arp.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/jhash.h>
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#include <linux/jiffies.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/netdevice.h>
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#include <linux/netlink.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/arp.h>
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#include <net/genetlink.h>
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#include <net/netlink.h>
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#include <net/sock.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 "hard-interface.h"
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#include "hash.h"
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#include "log.h"
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#include "netlink.h"
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#include "originator.h"
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#include "soft-interface.h"
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#include "sysfs.h"
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#include "translation-table.h"
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static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
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static void batadv_bla_periodic_work(struct work_struct *work);
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static void
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batadv_bla_send_announce(struct batadv_priv *bat_priv,
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struct batadv_bla_backbone_gw *backbone_gw);
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/**
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* batadv_choose_claim() - choose the right bucket for a claim.
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* @data: data to hash
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* @size: size of the hash table
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*
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* Return: the hash index of the claim
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*/
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static inline u32 batadv_choose_claim(const void *data, u32 size)
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{
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struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
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u32 hash = 0;
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hash = jhash(&claim->addr, sizeof(claim->addr), hash);
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hash = jhash(&claim->vid, sizeof(claim->vid), hash);
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return hash % size;
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}
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/**
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* batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway.
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* @data: data to hash
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* @size: size of the hash table
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*
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* Return: the hash index of the backbone gateway
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*/
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static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
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{
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const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
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u32 hash = 0;
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hash = jhash(&claim->addr, sizeof(claim->addr), hash);
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hash = jhash(&claim->vid, sizeof(claim->vid), hash);
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return hash % size;
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}
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/**
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* batadv_compare_backbone_gw() - compare address and vid of two backbone gws
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* @node: list node of the first entry to compare
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* @data2: pointer to the second backbone gateway
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*
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* Return: true if the backbones have the same data, false otherwise
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*/
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static bool batadv_compare_backbone_gw(const struct hlist_node *node,
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const void *data2)
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{
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const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
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hash_entry);
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const struct batadv_bla_backbone_gw *gw1 = data1;
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const struct batadv_bla_backbone_gw *gw2 = data2;
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if (!batadv_compare_eth(gw1->orig, gw2->orig))
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return false;
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if (gw1->vid != gw2->vid)
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return false;
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return true;
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}
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/**
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* batadv_compare_claim() - compare address and vid of two claims
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* @node: list node of the first entry to compare
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* @data2: pointer to the second claims
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*
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* Return: true if the claim have the same data, 0 otherwise
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*/
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static bool batadv_compare_claim(const struct hlist_node *node,
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const void *data2)
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{
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const void *data1 = container_of(node, struct batadv_bla_claim,
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hash_entry);
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const struct batadv_bla_claim *cl1 = data1;
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const struct batadv_bla_claim *cl2 = data2;
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if (!batadv_compare_eth(cl1->addr, cl2->addr))
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return false;
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if (cl1->vid != cl2->vid)
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return false;
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return true;
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}
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/**
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* batadv_backbone_gw_release() - release backbone gw from lists and queue for
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* free after rcu grace period
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* @ref: kref pointer of the backbone gw
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*/
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static void batadv_backbone_gw_release(struct kref *ref)
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{
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struct batadv_bla_backbone_gw *backbone_gw;
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backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
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refcount);
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kfree_rcu(backbone_gw, rcu);
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}
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/**
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* batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly
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* release it
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* @backbone_gw: backbone gateway to be free'd
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*/
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static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
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{
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kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
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}
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/**
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* batadv_claim_release() - release claim from lists and queue for free after
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* rcu grace period
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* @ref: kref pointer of the claim
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*/
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static void batadv_claim_release(struct kref *ref)
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{
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struct batadv_bla_claim *claim;
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struct batadv_bla_backbone_gw *old_backbone_gw;
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claim = container_of(ref, struct batadv_bla_claim, refcount);
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spin_lock_bh(&claim->backbone_lock);
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old_backbone_gw = claim->backbone_gw;
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claim->backbone_gw = NULL;
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spin_unlock_bh(&claim->backbone_lock);
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spin_lock_bh(&old_backbone_gw->crc_lock);
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old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
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spin_unlock_bh(&old_backbone_gw->crc_lock);
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batadv_backbone_gw_put(old_backbone_gw);
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kfree_rcu(claim, rcu);
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}
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/**
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* batadv_claim_put() - decrement the claim refcounter and possibly release it
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* @claim: claim to be free'd
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*/
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static void batadv_claim_put(struct batadv_bla_claim *claim)
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{
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kref_put(&claim->refcount, batadv_claim_release);
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}
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/**
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* batadv_claim_hash_find() - looks for a claim in the claim hash
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* @bat_priv: the bat priv with all the soft interface information
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* @data: search data (may be local/static data)
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*
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* Return: claim if found or NULL otherwise.
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*/
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static struct batadv_bla_claim *
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batadv_claim_hash_find(struct batadv_priv *bat_priv,
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struct batadv_bla_claim *data)
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{
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struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
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struct hlist_head *head;
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struct batadv_bla_claim *claim;
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struct batadv_bla_claim *claim_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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index = batadv_choose_claim(data, hash->size);
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head = &hash->table[index];
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rcu_read_lock();
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hlist_for_each_entry_rcu(claim, head, hash_entry) {
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if (!batadv_compare_claim(&claim->hash_entry, data))
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continue;
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if (!kref_get_unless_zero(&claim->refcount))
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continue;
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claim_tmp = claim;
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break;
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}
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rcu_read_unlock();
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return claim_tmp;
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}
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/**
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* batadv_backbone_hash_find() - looks for a backbone gateway in the hash
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the address of the originator
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* @vid: the VLAN ID
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*
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* Return: backbone gateway if found or NULL otherwise
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*/
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static struct batadv_bla_backbone_gw *
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batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
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unsigned short vid)
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{
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struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
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struct hlist_head *head;
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struct batadv_bla_backbone_gw search_entry, *backbone_gw;
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struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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ether_addr_copy(search_entry.orig, addr);
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search_entry.vid = vid;
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index = batadv_choose_backbone_gw(&search_entry, hash->size);
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head = &hash->table[index];
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rcu_read_lock();
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hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
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if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
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&search_entry))
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continue;
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if (!kref_get_unless_zero(&backbone_gw->refcount))
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continue;
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backbone_gw_tmp = backbone_gw;
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break;
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}
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rcu_read_unlock();
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return backbone_gw_tmp;
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}
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/**
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* batadv_bla_del_backbone_claims() - delete all claims for a backbone
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* @backbone_gw: backbone gateway where the claims should be removed
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*/
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static void
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batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
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{
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struct batadv_hashtable *hash;
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struct hlist_node *node_tmp;
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struct hlist_head *head;
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struct batadv_bla_claim *claim;
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int i;
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spinlock_t *list_lock; /* protects write access to the hash lists */
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hash = backbone_gw->bat_priv->bla.claim_hash;
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if (!hash)
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return;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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list_lock = &hash->list_locks[i];
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spin_lock_bh(list_lock);
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hlist_for_each_entry_safe(claim, node_tmp,
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head, hash_entry) {
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if (claim->backbone_gw != backbone_gw)
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continue;
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batadv_claim_put(claim);
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hlist_del_rcu(&claim->hash_entry);
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}
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spin_unlock_bh(list_lock);
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}
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/* all claims gone, initialize CRC */
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spin_lock_bh(&backbone_gw->crc_lock);
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backbone_gw->crc = BATADV_BLA_CRC_INIT;
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spin_unlock_bh(&backbone_gw->crc_lock);
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}
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/**
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* batadv_bla_send_claim() - sends a claim frame according to the provided info
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* @bat_priv: the bat priv with all the soft interface information
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* @mac: the mac address to be announced within the claim
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* @vid: the VLAN ID
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* @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
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*/
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static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
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unsigned short vid, int claimtype)
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{
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struct sk_buff *skb;
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struct ethhdr *ethhdr;
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struct batadv_hard_iface *primary_if;
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struct net_device *soft_iface;
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u8 *hw_src;
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struct batadv_bla_claim_dst local_claim_dest;
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__be32 zeroip = 0;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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return;
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memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
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sizeof(local_claim_dest));
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local_claim_dest.type = claimtype;
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soft_iface = primary_if->soft_iface;
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skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
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/* IP DST: 0.0.0.0 */
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zeroip,
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primary_if->soft_iface,
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/* IP SRC: 0.0.0.0 */
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zeroip,
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/* Ethernet DST: Broadcast */
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NULL,
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/* Ethernet SRC/HW SRC: originator mac */
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primary_if->net_dev->dev_addr,
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/* HW DST: FF:43:05:XX:YY:YY
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* with XX = claim type
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* and YY:YY = group id
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*/
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(u8 *)&local_claim_dest);
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if (!skb)
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goto out;
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ethhdr = (struct ethhdr *)skb->data;
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hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
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/* now we pretend that the client would have sent this ... */
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switch (claimtype) {
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case BATADV_CLAIM_TYPE_CLAIM:
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/* normal claim frame
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* set Ethernet SRC to the clients mac
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*/
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ether_addr_copy(ethhdr->h_source, mac);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"%s(): CLAIM %pM on vid %d\n", __func__, mac,
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batadv_print_vid(vid));
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break;
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case BATADV_CLAIM_TYPE_UNCLAIM:
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/* unclaim frame
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* set HW SRC to the clients mac
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*/
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ether_addr_copy(hw_src, mac);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"%s(): UNCLAIM %pM on vid %d\n", __func__, mac,
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batadv_print_vid(vid));
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break;
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case BATADV_CLAIM_TYPE_ANNOUNCE:
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/* announcement frame
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* set HW SRC to the special mac containg the crc
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*/
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ether_addr_copy(hw_src, mac);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"%s(): ANNOUNCE of %pM on vid %d\n", __func__,
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ethhdr->h_source, batadv_print_vid(vid));
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break;
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case BATADV_CLAIM_TYPE_REQUEST:
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/* request frame
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* set HW SRC and header destination to the receiving backbone
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* gws mac
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*/
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ether_addr_copy(hw_src, mac);
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ether_addr_copy(ethhdr->h_dest, mac);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"%s(): REQUEST of %pM to %pM on vid %d\n", __func__,
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ethhdr->h_source, ethhdr->h_dest,
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batadv_print_vid(vid));
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break;
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case BATADV_CLAIM_TYPE_LOOPDETECT:
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ether_addr_copy(ethhdr->h_source, mac);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"%s(): LOOPDETECT of %pM to %pM on vid %d\n",
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__func__, ethhdr->h_source, ethhdr->h_dest,
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batadv_print_vid(vid));
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break;
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}
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if (vid & BATADV_VLAN_HAS_TAG) {
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skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
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vid & VLAN_VID_MASK);
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if (!skb)
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goto out;
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}
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skb_reset_mac_header(skb);
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skb->protocol = eth_type_trans(skb, soft_iface);
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batadv_inc_counter(bat_priv, BATADV_CNT_RX);
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batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
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skb->len + ETH_HLEN);
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netif_rx(skb);
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out:
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if (primary_if)
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batadv_hardif_put(primary_if);
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}
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/**
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* batadv_bla_loopdetect_report() - worker for reporting the loop
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* @work: work queue item
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*
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* Throws an uevent, as the loopdetect check function can't do that itself
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* since the kernel may sleep while throwing uevents.
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*/
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static void batadv_bla_loopdetect_report(struct work_struct *work)
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{
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struct batadv_bla_backbone_gw *backbone_gw;
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struct batadv_priv *bat_priv;
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char vid_str[6] = { '\0' };
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backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
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report_work);
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bat_priv = backbone_gw->bat_priv;
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batadv_info(bat_priv->soft_iface,
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"Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
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batadv_print_vid(backbone_gw->vid));
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snprintf(vid_str, sizeof(vid_str), "%d",
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batadv_print_vid(backbone_gw->vid));
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vid_str[sizeof(vid_str) - 1] = 0;
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|
|
batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
|
|
vid_str);
|
|
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_get_backbone_gw() - finds or creates a backbone gateway
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the mac address of the originator
|
|
* @vid: the VLAN ID
|
|
* @own_backbone: set if the requested backbone is local
|
|
*
|
|
* Return: the (possibly created) backbone gateway or NULL on error
|
|
*/
|
|
static struct batadv_bla_backbone_gw *
|
|
batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
|
|
unsigned short vid, bool own_backbone)
|
|
{
|
|
struct batadv_bla_backbone_gw *entry;
|
|
struct batadv_orig_node *orig_node;
|
|
int hash_added;
|
|
|
|
entry = batadv_backbone_hash_find(bat_priv, orig, vid);
|
|
|
|
if (entry)
|
|
return entry;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): not found (%pM, %d), creating new entry\n", __func__,
|
|
orig, batadv_print_vid(vid));
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
return NULL;
|
|
|
|
entry->vid = vid;
|
|
entry->lasttime = jiffies;
|
|
entry->crc = BATADV_BLA_CRC_INIT;
|
|
entry->bat_priv = bat_priv;
|
|
spin_lock_init(&entry->crc_lock);
|
|
atomic_set(&entry->request_sent, 0);
|
|
atomic_set(&entry->wait_periods, 0);
|
|
ether_addr_copy(entry->orig, orig);
|
|
INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
|
|
kref_init(&entry->refcount);
|
|
|
|
kref_get(&entry->refcount);
|
|
hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
|
|
batadv_compare_backbone_gw,
|
|
batadv_choose_backbone_gw, entry,
|
|
&entry->hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* hash failed, free the structure */
|
|
kfree(entry);
|
|
return NULL;
|
|
}
|
|
|
|
/* this is a gateway now, remove any TT entry on this VLAN */
|
|
orig_node = batadv_orig_hash_find(bat_priv, orig);
|
|
if (orig_node) {
|
|
batadv_tt_global_del_orig(bat_priv, orig_node, vid,
|
|
"became a backbone gateway");
|
|
batadv_orig_node_put(orig_node);
|
|
}
|
|
|
|
if (own_backbone) {
|
|
batadv_bla_send_announce(bat_priv, entry);
|
|
|
|
/* this will be decreased in the worker thread */
|
|
atomic_inc(&entry->request_sent);
|
|
atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
|
|
atomic_inc(&bat_priv->bla.num_requests);
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the selected primary interface
|
|
* @vid: VLAN identifier
|
|
*
|
|
* update or add the own backbone gw to make sure we announce
|
|
* where we receive other backbone gws
|
|
*/
|
|
static void
|
|
batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
|
|
primary_if->net_dev->dev_addr,
|
|
vid, true);
|
|
if (unlikely(!backbone_gw))
|
|
return;
|
|
|
|
backbone_gw->lasttime = jiffies;
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_answer_request() - answer a bla request by sending own claims
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: interface where the request came on
|
|
* @vid: the vid where the request came on
|
|
*
|
|
* Repeat all of our own claims, and finally send an ANNOUNCE frame
|
|
* to allow the requester another check if the CRC is correct now.
|
|
*/
|
|
static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
unsigned short vid)
|
|
{
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
struct batadv_bla_claim *claim;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
int i;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): received a claim request, send all of our own claims again\n",
|
|
__func__);
|
|
|
|
backbone_gw = batadv_backbone_hash_find(bat_priv,
|
|
primary_if->net_dev->dev_addr,
|
|
vid);
|
|
if (!backbone_gw)
|
|
return;
|
|
|
|
hash = bat_priv->bla.claim_hash;
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, head, hash_entry) {
|
|
/* only own claims are interesting */
|
|
if (claim->backbone_gw != backbone_gw)
|
|
continue;
|
|
|
|
batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
|
|
BATADV_CLAIM_TYPE_CLAIM);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* finally, send an announcement frame */
|
|
batadv_bla_send_announce(bat_priv, backbone_gw);
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_send_request() - send a request to repeat claims
|
|
* @backbone_gw: the backbone gateway from whom we are out of sync
|
|
*
|
|
* When the crc is wrong, ask the backbone gateway for a full table update.
|
|
* After the request, it will repeat all of his own claims and finally
|
|
* send an announcement claim with which we can check again.
|
|
*/
|
|
static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
/* first, remove all old entries */
|
|
batadv_bla_del_backbone_claims(backbone_gw);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"Sending REQUEST to %pM\n", backbone_gw->orig);
|
|
|
|
/* send request */
|
|
batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
|
|
backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
|
|
|
|
/* no local broadcasts should be sent or received, for now. */
|
|
if (!atomic_read(&backbone_gw->request_sent)) {
|
|
atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_send_announce() - Send an announcement frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @backbone_gw: our backbone gateway which should be announced
|
|
*/
|
|
static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
u8 mac[ETH_ALEN];
|
|
__be16 crc;
|
|
|
|
memcpy(mac, batadv_announce_mac, 4);
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
crc = htons(backbone_gw->crc);
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
memcpy(&mac[4], &crc, 2);
|
|
|
|
batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
|
|
BATADV_CLAIM_TYPE_ANNOUNCE);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_add_claim() - Adds a claim in the claim hash
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @mac: the mac address of the claim
|
|
* @vid: the VLAN ID of the frame
|
|
* @backbone_gw: the backbone gateway which claims it
|
|
*/
|
|
static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
|
|
const u8 *mac, const unsigned short vid,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
struct batadv_bla_backbone_gw *old_backbone_gw;
|
|
struct batadv_bla_claim *claim;
|
|
struct batadv_bla_claim search_claim;
|
|
bool remove_crc = false;
|
|
int hash_added;
|
|
|
|
ether_addr_copy(search_claim.addr, mac);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
/* create a new claim entry if it does not exist yet. */
|
|
if (!claim) {
|
|
claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
|
|
if (!claim)
|
|
return;
|
|
|
|
ether_addr_copy(claim->addr, mac);
|
|
spin_lock_init(&claim->backbone_lock);
|
|
claim->vid = vid;
|
|
claim->lasttime = jiffies;
|
|
kref_get(&backbone_gw->refcount);
|
|
claim->backbone_gw = backbone_gw;
|
|
kref_init(&claim->refcount);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): adding new entry %pM, vid %d to hash ...\n",
|
|
__func__, mac, batadv_print_vid(vid));
|
|
|
|
kref_get(&claim->refcount);
|
|
hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
|
|
batadv_compare_claim,
|
|
batadv_choose_claim, claim,
|
|
&claim->hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* only local changes happened. */
|
|
kfree(claim);
|
|
return;
|
|
}
|
|
} else {
|
|
claim->lasttime = jiffies;
|
|
if (claim->backbone_gw == backbone_gw)
|
|
/* no need to register a new backbone */
|
|
goto claim_free_ref;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): changing ownership for %pM, vid %d to gw %pM\n",
|
|
__func__, mac, batadv_print_vid(vid),
|
|
backbone_gw->orig);
|
|
|
|
remove_crc = true;
|
|
}
|
|
|
|
/* replace backbone_gw atomically and adjust reference counters */
|
|
spin_lock_bh(&claim->backbone_lock);
|
|
old_backbone_gw = claim->backbone_gw;
|
|
kref_get(&backbone_gw->refcount);
|
|
claim->backbone_gw = backbone_gw;
|
|
spin_unlock_bh(&claim->backbone_lock);
|
|
|
|
if (remove_crc) {
|
|
/* remove claim address from old backbone_gw */
|
|
spin_lock_bh(&old_backbone_gw->crc_lock);
|
|
old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
|
|
spin_unlock_bh(&old_backbone_gw->crc_lock);
|
|
}
|
|
|
|
batadv_backbone_gw_put(old_backbone_gw);
|
|
|
|
/* add claim address to new backbone_gw */
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
backbone_gw->lasttime = jiffies;
|
|
|
|
claim_free_ref:
|
|
batadv_claim_put(claim);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of
|
|
* claim
|
|
* @claim: claim whose backbone_gw should be returned
|
|
*
|
|
* Return: valid reference to claim::backbone_gw
|
|
*/
|
|
static struct batadv_bla_backbone_gw *
|
|
batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
spin_lock_bh(&claim->backbone_lock);
|
|
backbone_gw = claim->backbone_gw;
|
|
kref_get(&backbone_gw->refcount);
|
|
spin_unlock_bh(&claim->backbone_lock);
|
|
|
|
return backbone_gw;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_del_claim() - delete a claim from the claim hash
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @mac: mac address of the claim to be removed
|
|
* @vid: VLAN id for the claim to be removed
|
|
*/
|
|
static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
|
|
const u8 *mac, const unsigned short vid)
|
|
{
|
|
struct batadv_bla_claim search_claim, *claim;
|
|
|
|
ether_addr_copy(search_claim.addr, mac);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
if (!claim)
|
|
return;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__,
|
|
mac, batadv_print_vid(vid));
|
|
|
|
batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
|
|
batadv_choose_claim, claim);
|
|
batadv_claim_put(claim); /* reference from the hash is gone */
|
|
|
|
/* don't need the reference from hash_find() anymore */
|
|
batadv_claim_put(claim);
|
|
}
|
|
|
|
/**
|
|
* batadv_handle_announce() - check for ANNOUNCE frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @an_addr: announcement mac address (ARP Sender HW address)
|
|
* @backbone_addr: originator address of the sender (Ethernet source MAC)
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* Return: true if handled
|
|
*/
|
|
static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
|
|
u8 *backbone_addr, unsigned short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
u16 backbone_crc, crc;
|
|
|
|
if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
|
|
return false;
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
|
|
false);
|
|
|
|
if (unlikely(!backbone_gw))
|
|
return true;
|
|
|
|
/* handle as ANNOUNCE frame */
|
|
backbone_gw->lasttime = jiffies;
|
|
crc = ntohs(*((__be16 *)(&an_addr[4])));
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
|
|
__func__, batadv_print_vid(vid), backbone_gw->orig, crc);
|
|
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
backbone_crc = backbone_gw->crc;
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
|
|
if (backbone_crc != crc) {
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
|
|
__func__, backbone_gw->orig,
|
|
batadv_print_vid(backbone_gw->vid),
|
|
backbone_crc, crc);
|
|
|
|
batadv_bla_send_request(backbone_gw);
|
|
} else {
|
|
/* if we have sent a request and the crc was OK,
|
|
* we can allow traffic again.
|
|
*/
|
|
if (atomic_read(&backbone_gw->request_sent)) {
|
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 0);
|
|
}
|
|
}
|
|
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_handle_request() - check for REQUEST frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the primary hard interface of this batman soft interface
|
|
* @backbone_addr: backbone address to be requested (ARP sender HW MAC)
|
|
* @ethhdr: ethernet header of a packet
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* Return: true if handled
|
|
*/
|
|
static bool batadv_handle_request(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
u8 *backbone_addr, struct ethhdr *ethhdr,
|
|
unsigned short vid)
|
|
{
|
|
/* check for REQUEST frame */
|
|
if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
|
|
return false;
|
|
|
|
/* sanity check, this should not happen on a normal switch,
|
|
* we ignore it in this case.
|
|
*/
|
|
if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
|
|
return true;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): REQUEST vid %d (sent by %pM)...\n",
|
|
__func__, batadv_print_vid(vid), ethhdr->h_source);
|
|
|
|
batadv_bla_answer_request(bat_priv, primary_if, vid);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_handle_unclaim() - check for UNCLAIM frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the primary hard interface of this batman soft interface
|
|
* @backbone_addr: originator address of the backbone (Ethernet source)
|
|
* @claim_addr: Client to be unclaimed (ARP sender HW MAC)
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* Return: true if handled
|
|
*/
|
|
static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
u8 *backbone_addr, u8 *claim_addr,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
/* unclaim in any case if it is our own */
|
|
if (primary_if && batadv_compare_eth(backbone_addr,
|
|
primary_if->net_dev->dev_addr))
|
|
batadv_bla_send_claim(bat_priv, claim_addr, vid,
|
|
BATADV_CLAIM_TYPE_UNCLAIM);
|
|
|
|
backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
|
|
|
|
if (!backbone_gw)
|
|
return true;
|
|
|
|
/* this must be an UNCLAIM frame */
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__,
|
|
claim_addr, batadv_print_vid(vid), backbone_gw->orig);
|
|
|
|
batadv_bla_del_claim(bat_priv, claim_addr, vid);
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_handle_claim() - check for CLAIM frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the primary hard interface of this batman soft interface
|
|
* @backbone_addr: originator address of the backbone (Ethernet Source)
|
|
* @claim_addr: client mac address to be claimed (ARP sender HW MAC)
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* Return: true if handled
|
|
*/
|
|
static bool batadv_handle_claim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
u8 *backbone_addr, u8 *claim_addr,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
/* register the gateway if not yet available, and add the claim. */
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
|
|
false);
|
|
|
|
if (unlikely(!backbone_gw))
|
|
return true;
|
|
|
|
/* this must be a CLAIM frame */
|
|
batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
|
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
|
|
batadv_bla_send_claim(bat_priv, claim_addr, vid,
|
|
BATADV_CLAIM_TYPE_CLAIM);
|
|
|
|
/* TODO: we could call something like tt_local_del() here. */
|
|
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_check_claim_group() - check for claim group membership
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the primary interface of this batman interface
|
|
* @hw_src: the Hardware source in the ARP Header
|
|
* @hw_dst: the Hardware destination in the ARP Header
|
|
* @ethhdr: pointer to the Ethernet header of the claim frame
|
|
*
|
|
* checks if it is a claim packet and if its on the same group.
|
|
* This function also applies the group ID of the sender
|
|
* if it is in the same mesh.
|
|
*
|
|
* Return:
|
|
* 2 - if it is a claim packet and on the same group
|
|
* 1 - if is a claim packet from another group
|
|
* 0 - if it is not a claim packet
|
|
*/
|
|
static int batadv_check_claim_group(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
u8 *hw_src, u8 *hw_dst,
|
|
struct ethhdr *ethhdr)
|
|
{
|
|
u8 *backbone_addr;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
|
|
|
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
|
|
bla_dst_own = &bat_priv->bla.claim_dest;
|
|
|
|
/* if announcement packet, use the source,
|
|
* otherwise assume it is in the hw_src
|
|
*/
|
|
switch (bla_dst->type) {
|
|
case BATADV_CLAIM_TYPE_CLAIM:
|
|
backbone_addr = hw_src;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_REQUEST:
|
|
case BATADV_CLAIM_TYPE_ANNOUNCE:
|
|
case BATADV_CLAIM_TYPE_UNCLAIM:
|
|
backbone_addr = ethhdr->h_source;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* don't accept claim frames from ourselves */
|
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
|
|
return 0;
|
|
|
|
/* if its already the same group, it is fine. */
|
|
if (bla_dst->group == bla_dst_own->group)
|
|
return 2;
|
|
|
|
/* lets see if this originator is in our mesh */
|
|
orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
|
|
|
|
/* dont accept claims from gateways which are not in
|
|
* the same mesh or group.
|
|
*/
|
|
if (!orig_node)
|
|
return 1;
|
|
|
|
/* if our mesh friends mac is bigger, use it for ourselves. */
|
|
if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"taking other backbones claim group: %#.4x\n",
|
|
ntohs(bla_dst->group));
|
|
bla_dst_own->group = bla_dst->group;
|
|
}
|
|
|
|
batadv_orig_node_put(orig_node);
|
|
|
|
return 2;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_process_claim() - Check if this is a claim frame, and process it
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the primary hard interface of this batman soft interface
|
|
* @skb: the frame to be checked
|
|
*
|
|
* Return: true if it was a claim frame, otherwise return false to
|
|
* tell the callee that it can use the frame on its own.
|
|
*/
|
|
static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
|
|
u8 *hw_src, *hw_dst;
|
|
struct vlan_hdr *vhdr, vhdr_buf;
|
|
struct ethhdr *ethhdr;
|
|
struct arphdr *arphdr;
|
|
unsigned short vid;
|
|
int vlan_depth = 0;
|
|
__be16 proto;
|
|
int headlen;
|
|
int ret;
|
|
|
|
vid = batadv_get_vid(skb, 0);
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
proto = ethhdr->h_proto;
|
|
headlen = ETH_HLEN;
|
|
if (vid & BATADV_VLAN_HAS_TAG) {
|
|
/* Traverse the VLAN/Ethertypes.
|
|
*
|
|
* At this point it is known that the first protocol is a VLAN
|
|
* header, so start checking at the encapsulated protocol.
|
|
*
|
|
* The depth of the VLAN headers is recorded to drop BLA claim
|
|
* frames encapsulated into multiple VLAN headers (QinQ).
|
|
*/
|
|
do {
|
|
vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
|
|
&vhdr_buf);
|
|
if (!vhdr)
|
|
return false;
|
|
|
|
proto = vhdr->h_vlan_encapsulated_proto;
|
|
headlen += VLAN_HLEN;
|
|
vlan_depth++;
|
|
} while (proto == htons(ETH_P_8021Q));
|
|
}
|
|
|
|
if (proto != htons(ETH_P_ARP))
|
|
return false; /* not a claim frame */
|
|
|
|
/* this must be a ARP frame. check if it is a claim. */
|
|
|
|
if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
|
|
return false;
|
|
|
|
/* pskb_may_pull() may have modified the pointers, get ethhdr again */
|
|
ethhdr = eth_hdr(skb);
|
|
arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
|
|
|
|
/* Check whether the ARP frame carries a valid
|
|
* IP information
|
|
*/
|
|
if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
|
|
return false;
|
|
if (arphdr->ar_pro != htons(ETH_P_IP))
|
|
return false;
|
|
if (arphdr->ar_hln != ETH_ALEN)
|
|
return false;
|
|
if (arphdr->ar_pln != 4)
|
|
return false;
|
|
|
|
hw_src = (u8 *)arphdr + sizeof(struct arphdr);
|
|
hw_dst = hw_src + ETH_ALEN + 4;
|
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
|
|
bla_dst_own = &bat_priv->bla.claim_dest;
|
|
|
|
/* check if it is a claim frame in general */
|
|
if (memcmp(bla_dst->magic, bla_dst_own->magic,
|
|
sizeof(bla_dst->magic)) != 0)
|
|
return false;
|
|
|
|
/* check if there is a claim frame encapsulated deeper in (QinQ) and
|
|
* drop that, as this is not supported by BLA but should also not be
|
|
* sent via the mesh.
|
|
*/
|
|
if (vlan_depth > 1)
|
|
return true;
|
|
|
|
/* Let the loopdetect frames on the mesh in any case. */
|
|
if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
|
|
return false;
|
|
|
|
/* check if it is a claim frame. */
|
|
ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
|
|
ethhdr);
|
|
if (ret == 1)
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
|
|
__func__, ethhdr->h_source, batadv_print_vid(vid),
|
|
hw_src, hw_dst);
|
|
|
|
if (ret < 2)
|
|
return !!ret;
|
|
|
|
/* become a backbone gw ourselves on this vlan if not happened yet */
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
|
|
/* check for the different types of claim frames ... */
|
|
switch (bla_dst->type) {
|
|
case BATADV_CLAIM_TYPE_CLAIM:
|
|
if (batadv_handle_claim(bat_priv, primary_if, hw_src,
|
|
ethhdr->h_source, vid))
|
|
return true;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_UNCLAIM:
|
|
if (batadv_handle_unclaim(bat_priv, primary_if,
|
|
ethhdr->h_source, hw_src, vid))
|
|
return true;
|
|
break;
|
|
|
|
case BATADV_CLAIM_TYPE_ANNOUNCE:
|
|
if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
|
|
vid))
|
|
return true;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_REQUEST:
|
|
if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
|
|
vid))
|
|
return true;
|
|
break;
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
|
|
__func__, ethhdr->h_source, batadv_print_vid(vid), hw_src,
|
|
hw_dst);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or
|
|
* immediately
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @now: whether the whole hash shall be wiped now
|
|
*
|
|
* Check when we last heard from other nodes, and remove them in case of
|
|
* a time out, or clean all backbone gws if now is set.
|
|
*/
|
|
static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct hlist_node *node_tmp;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
int i;
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(backbone_gw, node_tmp,
|
|
head, hash_entry) {
|
|
if (now)
|
|
goto purge_now;
|
|
if (!batadv_has_timed_out(backbone_gw->lasttime,
|
|
BATADV_BLA_BACKBONE_TIMEOUT))
|
|
continue;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"%s(): backbone gw %pM timed out\n",
|
|
__func__, backbone_gw->orig);
|
|
|
|
purge_now:
|
|
/* don't wait for the pending request anymore */
|
|
if (atomic_read(&backbone_gw->request_sent))
|
|
atomic_dec(&bat_priv->bla.num_requests);
|
|
|
|
batadv_bla_del_backbone_claims(backbone_gw);
|
|
|
|
hlist_del_rcu(&backbone_gw->hash_entry);
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_purge_claims() - Remove claims after a timeout or immediately
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the selected primary interface, may be NULL if now is set
|
|
* @now: whether the whole hash shall be wiped now
|
|
*
|
|
* Check when we heard last time from our own claims, and remove them in case of
|
|
* a time out, or clean all claims if now is set
|
|
*/
|
|
static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
int now)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_bla_claim *claim;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
int i;
|
|
|
|
hash = bat_priv->bla.claim_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, head, hash_entry) {
|
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
|
|
if (now)
|
|
goto purge_now;
|
|
|
|
if (!batadv_compare_eth(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr))
|
|
goto skip;
|
|
|
|
if (!batadv_has_timed_out(claim->lasttime,
|
|
BATADV_BLA_CLAIM_TIMEOUT))
|
|
goto skip;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): timed out.\n", __func__);
|
|
|
|
purge_now:
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): %pM, vid %d\n", __func__,
|
|
claim->addr, claim->vid);
|
|
|
|
batadv_handle_unclaim(bat_priv, primary_if,
|
|
backbone_gw->orig,
|
|
claim->addr, claim->vid);
|
|
skip:
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_update_orig_address() - Update the backbone gateways when the own
|
|
* originator address changes
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the new selected primary_if
|
|
* @oldif: the old primary interface, may be NULL
|
|
*/
|
|
void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct batadv_hard_iface *oldif)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
__be16 group;
|
|
int i;
|
|
|
|
/* reset bridge loop avoidance group id */
|
|
group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
|
|
bat_priv->bla.claim_dest.group = group;
|
|
|
|
/* purge everything when bridge loop avoidance is turned off */
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
oldif = NULL;
|
|
|
|
if (!oldif) {
|
|
batadv_bla_purge_claims(bat_priv, NULL, 1);
|
|
batadv_bla_purge_backbone_gw(bat_priv, 1);
|
|
return;
|
|
}
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
|
|
/* own orig still holds the old value. */
|
|
if (!batadv_compare_eth(backbone_gw->orig,
|
|
oldif->net_dev->dev_addr))
|
|
continue;
|
|
|
|
ether_addr_copy(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr);
|
|
/* send an announce frame so others will ask for our
|
|
* claims and update their tables.
|
|
*/
|
|
batadv_bla_send_announce(bat_priv, backbone_gw);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_send_loopdetect() - send a loopdetect frame
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @backbone_gw: the backbone gateway for which a loop should be detected
|
|
*
|
|
* To detect loops that the bridge loop avoidance can't handle, send a loop
|
|
* detection packet on the backbone. Unlike other BLA frames, this frame will
|
|
* be allowed on the mesh by other nodes. If it is received on the mesh, this
|
|
* indicates that there is a loop.
|
|
*/
|
|
static void
|
|
batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
|
|
backbone_gw->vid);
|
|
batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
|
|
backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_status_update() - purge bla interfaces if necessary
|
|
* @net_dev: the soft interface net device
|
|
*/
|
|
void batadv_bla_status_update(struct net_device *net_dev)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hard_iface *primary_if;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
return;
|
|
|
|
/* this function already purges everything when bla is disabled,
|
|
* so just call that one.
|
|
*/
|
|
batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
|
|
batadv_hardif_put(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_periodic_work() - performs periodic bla work
|
|
* @work: kernel work struct
|
|
*
|
|
* periodic work to do:
|
|
* * purge structures when they are too old
|
|
* * send announcements
|
|
*/
|
|
static void batadv_bla_periodic_work(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_priv_bla *priv_bla;
|
|
struct hlist_head *head;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_hashtable *hash;
|
|
struct batadv_hard_iface *primary_if;
|
|
bool send_loopdetect = false;
|
|
int i;
|
|
|
|
delayed_work = to_delayed_work(work);
|
|
priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
|
|
bat_priv = container_of(priv_bla, struct batadv_priv, bla);
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
batadv_bla_purge_claims(bat_priv, primary_if, 0);
|
|
batadv_bla_purge_backbone_gw(bat_priv, 0);
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto out;
|
|
|
|
if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
|
|
/* set a new random mac address for the next bridge loop
|
|
* detection frames. Set the locally administered bit to avoid
|
|
* collisions with users mac addresses.
|
|
*/
|
|
eth_random_addr(bat_priv->bla.loopdetect_addr);
|
|
bat_priv->bla.loopdetect_addr[0] = 0xba;
|
|
bat_priv->bla.loopdetect_addr[1] = 0xbe;
|
|
bat_priv->bla.loopdetect_lasttime = jiffies;
|
|
atomic_set(&bat_priv->bla.loopdetect_next,
|
|
BATADV_BLA_LOOPDETECT_PERIODS);
|
|
|
|
/* mark for sending loop detect on all VLANs */
|
|
send_loopdetect = true;
|
|
}
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
goto out;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
|
|
if (!batadv_compare_eth(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr))
|
|
continue;
|
|
|
|
backbone_gw->lasttime = jiffies;
|
|
|
|
batadv_bla_send_announce(bat_priv, backbone_gw);
|
|
if (send_loopdetect)
|
|
batadv_bla_send_loopdetect(bat_priv,
|
|
backbone_gw);
|
|
|
|
/* request_sent is only set after creation to avoid
|
|
* problems when we are not yet known as backbone gw
|
|
* in the backbone.
|
|
*
|
|
* We can reset this now after we waited some periods
|
|
* to give bridge forward delays and bla group forming
|
|
* some grace time.
|
|
*/
|
|
|
|
if (atomic_read(&backbone_gw->request_sent) == 0)
|
|
continue;
|
|
|
|
if (!atomic_dec_and_test(&backbone_gw->wait_periods))
|
|
continue;
|
|
|
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 0);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
|
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
|
|
}
|
|
|
|
/* The hash for claim and backbone hash receive the same key because they
|
|
* are getting initialized by hash_new with the same key. Reinitializing
|
|
* them with to different keys to allow nested locking without generating
|
|
* lockdep warnings
|
|
*/
|
|
static struct lock_class_key batadv_claim_hash_lock_class_key;
|
|
static struct lock_class_key batadv_backbone_hash_lock_class_key;
|
|
|
|
/**
|
|
* batadv_bla_init() - initialize all bla structures
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Return: 0 on success, < 0 on error.
|
|
*/
|
|
int batadv_bla_init(struct batadv_priv *bat_priv)
|
|
{
|
|
int i;
|
|
u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
|
|
struct batadv_hard_iface *primary_if;
|
|
u16 crc;
|
|
unsigned long entrytime;
|
|
|
|
spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
|
|
|
|
/* setting claim destination address */
|
|
memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
|
|
bat_priv->bla.claim_dest.type = 0;
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (primary_if) {
|
|
crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
bat_priv->bla.claim_dest.group = htons(crc);
|
|
batadv_hardif_put(primary_if);
|
|
} else {
|
|
bat_priv->bla.claim_dest.group = 0; /* will be set later */
|
|
}
|
|
|
|
/* initialize the duplicate list */
|
|
entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
|
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
|
|
bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
|
|
bat_priv->bla.bcast_duplist_curr = 0;
|
|
|
|
atomic_set(&bat_priv->bla.loopdetect_next,
|
|
BATADV_BLA_LOOPDETECT_PERIODS);
|
|
|
|
if (bat_priv->bla.claim_hash)
|
|
return 0;
|
|
|
|
bat_priv->bla.claim_hash = batadv_hash_new(128);
|
|
bat_priv->bla.backbone_hash = batadv_hash_new(32);
|
|
|
|
if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
|
|
return -ENOMEM;
|
|
|
|
batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
|
|
&batadv_claim_hash_lock_class_key);
|
|
batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
|
|
&batadv_backbone_hash_lock_class_key);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
|
|
|
|
INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
|
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
|
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup.
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: contains the bcast_packet to be checked
|
|
*
|
|
* check if it is on our broadcast list. Another gateway might
|
|
* have sent the same packet because it is connected to the same backbone,
|
|
* so we have to remove this duplicate.
|
|
*
|
|
* This is performed by checking the CRC, which will tell us
|
|
* with a good chance that it is the same packet. If it is furthermore
|
|
* sent by another host, drop it. We allow equal packets from
|
|
* the same host however as this might be intended.
|
|
*
|
|
* Return: true if a packet is in the duplicate list, false otherwise.
|
|
*/
|
|
bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb)
|
|
{
|
|
int i, curr;
|
|
__be32 crc;
|
|
struct batadv_bcast_packet *bcast_packet;
|
|
struct batadv_bcast_duplist_entry *entry;
|
|
bool ret = false;
|
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data;
|
|
|
|
/* calculate the crc ... */
|
|
crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
|
|
|
|
spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
|
|
curr = (bat_priv->bla.bcast_duplist_curr + i);
|
|
curr %= BATADV_DUPLIST_SIZE;
|
|
entry = &bat_priv->bla.bcast_duplist[curr];
|
|
|
|
/* we can stop searching if the entry is too old ;
|
|
* later entries will be even older
|
|
*/
|
|
if (batadv_has_timed_out(entry->entrytime,
|
|
BATADV_DUPLIST_TIMEOUT))
|
|
break;
|
|
|
|
if (entry->crc != crc)
|
|
continue;
|
|
|
|
if (batadv_compare_eth(entry->orig, bcast_packet->orig))
|
|
continue;
|
|
|
|
/* this entry seems to match: same crc, not too old,
|
|
* and from another gw. therefore return true to forbid it.
|
|
*/
|
|
ret = true;
|
|
goto out;
|
|
}
|
|
/* not found, add a new entry (overwrite the oldest entry)
|
|
* and allow it, its the first occurrence.
|
|
*/
|
|
curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
|
|
curr %= BATADV_DUPLIST_SIZE;
|
|
entry = &bat_priv->bla.bcast_duplist[curr];
|
|
entry->crc = crc;
|
|
entry->entrytime = jiffies;
|
|
ether_addr_copy(entry->orig, bcast_packet->orig);
|
|
bat_priv->bla.bcast_duplist_curr = curr;
|
|
|
|
out:
|
|
spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for
|
|
* the VLAN identified by vid.
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: originator mac address
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Return: true if orig is a backbone for this vid, false otherwise.
|
|
*/
|
|
bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
|
|
struct hlist_head *head;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
int i;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
return false;
|
|
|
|
if (!hash)
|
|
return false;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
|
|
if (batadv_compare_eth(backbone_gw->orig, orig) &&
|
|
backbone_gw->vid == vid) {
|
|
rcu_read_unlock();
|
|
return true;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN
|
|
* @skb: the frame to be checked
|
|
* @orig_node: the orig_node of the frame
|
|
* @hdr_size: maximum length of the frame
|
|
*
|
|
* Return: true if the orig_node is also a gateway on the soft interface,
|
|
* otherwise it returns false.
|
|
*/
|
|
bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
|
|
struct batadv_orig_node *orig_node, int hdr_size)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
unsigned short vid;
|
|
|
|
if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
|
|
return false;
|
|
|
|
/* first, find out the vid. */
|
|
if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
|
|
return false;
|
|
|
|
vid = batadv_get_vid(skb, hdr_size);
|
|
|
|
/* see if this originator is a backbone gw for this VLAN */
|
|
backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
|
|
orig_node->orig, vid);
|
|
if (!backbone_gw)
|
|
return false;
|
|
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_free() - free all bla structures
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* for softinterface free or module unload
|
|
*/
|
|
void batadv_bla_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hard_iface *primary_if;
|
|
|
|
cancel_delayed_work_sync(&bat_priv->bla.work);
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
|
|
if (bat_priv->bla.claim_hash) {
|
|
batadv_bla_purge_claims(bat_priv, primary_if, 1);
|
|
batadv_hash_destroy(bat_priv->bla.claim_hash);
|
|
bat_priv->bla.claim_hash = NULL;
|
|
}
|
|
if (bat_priv->bla.backbone_hash) {
|
|
batadv_bla_purge_backbone_gw(bat_priv, 1);
|
|
batadv_hash_destroy(bat_priv->bla.backbone_hash);
|
|
bat_priv->bla.backbone_hash = NULL;
|
|
}
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_loopdetect_check() - check and handle a detected loop
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the packet to check
|
|
* @primary_if: interface where the request came on
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* Checks if this packet is a loop detect frame which has been sent by us,
|
|
* throw an uevent and log the event if that is the case.
|
|
*
|
|
* Return: true if it is a loop detect frame which is to be dropped, false
|
|
* otherwise.
|
|
*/
|
|
static bool
|
|
batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
|
|
struct batadv_hard_iface *primary_if,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct ethhdr *ethhdr;
|
|
bool ret;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
/* Only check for the MAC address and skip more checks here for
|
|
* performance reasons - this function is on the hotpath, after all.
|
|
*/
|
|
if (!batadv_compare_eth(ethhdr->h_source,
|
|
bat_priv->bla.loopdetect_addr))
|
|
return false;
|
|
|
|
/* If the packet came too late, don't forward it on the mesh
|
|
* but don't consider that as loop. It might be a coincidence.
|
|
*/
|
|
if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
|
|
BATADV_BLA_LOOPDETECT_TIMEOUT))
|
|
return true;
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
|
|
primary_if->net_dev->dev_addr,
|
|
vid, true);
|
|
if (unlikely(!backbone_gw))
|
|
return true;
|
|
|
|
ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
|
|
|
|
/* backbone_gw is unreferenced in the report work function function
|
|
* if queue_work() call was successful
|
|
*/
|
|
if (!ret)
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_rx() - check packets coming from the mesh.
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the frame to be checked
|
|
* @vid: the VLAN ID of the frame
|
|
* @is_bcast: the packet came in a broadcast packet type.
|
|
*
|
|
* batadv_bla_rx avoidance checks if:
|
|
* * we have to race for a claim
|
|
* * if the frame is allowed on the LAN
|
|
*
|
|
* in these cases, the skb is further handled by this function
|
|
*
|
|
* Return: true if handled, otherwise it returns false and the caller shall
|
|
* further process the skb.
|
|
*/
|
|
bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
|
|
unsigned short vid, bool is_bcast)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_bla_claim search_claim, *claim = NULL;
|
|
struct batadv_hard_iface *primary_if;
|
|
bool own_claim;
|
|
bool ret;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto handled;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto allow;
|
|
|
|
if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
|
|
goto handled;
|
|
|
|
if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
|
|
/* don't allow broadcasts while requests are in flight */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
|
|
goto handled;
|
|
|
|
ether_addr_copy(search_claim.addr, ethhdr->h_source);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
if (!claim) {
|
|
/* possible optimization: race for a claim */
|
|
/* No claim exists yet, claim it for us!
|
|
*/
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n",
|
|
__func__, ethhdr->h_source,
|
|
batadv_is_my_client(bat_priv,
|
|
ethhdr->h_source, vid) ?
|
|
"yes" : "no");
|
|
batadv_handle_claim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
}
|
|
|
|
/* if it is our own claim ... */
|
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
|
|
own_claim = batadv_compare_eth(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr);
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
|
|
if (own_claim) {
|
|
/* ... allow it in any case */
|
|
claim->lasttime = jiffies;
|
|
goto allow;
|
|
}
|
|
|
|
/* if it is a broadcast ... */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
|
|
/* ... drop it. the responsible gateway is in charge.
|
|
*
|
|
* We need to check is_bcast because with the gateway
|
|
* feature, broadcasts (like DHCP requests) may be sent
|
|
* using a unicast packet type.
|
|
*/
|
|
goto handled;
|
|
} else {
|
|
/* seems the client considers us as its best gateway.
|
|
* send a claim and update the claim table
|
|
* immediately.
|
|
*/
|
|
batadv_handle_claim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
}
|
|
allow:
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
ret = false;
|
|
goto out;
|
|
|
|
handled:
|
|
kfree_skb(skb);
|
|
ret = true;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
if (claim)
|
|
batadv_claim_put(claim);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_tx() - check packets going into the mesh
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the frame to be checked
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* batadv_bla_tx checks if:
|
|
* * a claim was received which has to be processed
|
|
* * the frame is allowed on the mesh
|
|
*
|
|
* in these cases, the skb is further handled by this function.
|
|
*
|
|
* This call might reallocate skb data.
|
|
*
|
|
* Return: true if handled, otherwise it returns false and the caller shall
|
|
* further process the skb.
|
|
*/
|
|
bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
|
|
unsigned short vid)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_bla_claim search_claim, *claim = NULL;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_hard_iface *primary_if;
|
|
bool client_roamed;
|
|
bool ret = false;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto allow;
|
|
|
|
if (batadv_bla_process_claim(bat_priv, primary_if, skb))
|
|
goto handled;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
|
|
/* don't allow broadcasts while requests are in flight */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest))
|
|
goto handled;
|
|
|
|
ether_addr_copy(search_claim.addr, ethhdr->h_source);
|
|
search_claim.vid = vid;
|
|
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
/* if no claim exists, allow it. */
|
|
if (!claim)
|
|
goto allow;
|
|
|
|
/* check if we are responsible. */
|
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
|
|
client_roamed = batadv_compare_eth(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr);
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
|
|
if (client_roamed) {
|
|
/* if yes, the client has roamed and we have
|
|
* to unclaim it.
|
|
*/
|
|
if (batadv_has_timed_out(claim->lasttime, 100)) {
|
|
/* only unclaim if the last claim entry is
|
|
* older than 100 ms to make sure we really
|
|
* have a roaming client here.
|
|
*/
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n",
|
|
__func__, ethhdr->h_source);
|
|
batadv_handle_unclaim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
} else {
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n",
|
|
__func__, ethhdr->h_source);
|
|
goto handled;
|
|
}
|
|
}
|
|
|
|
/* check if it is a multicast/broadcast frame */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest)) {
|
|
/* drop it. the responsible gateway has forwarded it into
|
|
* the backbone network.
|
|
*/
|
|
goto handled;
|
|
} else {
|
|
/* we must allow it. at least if we are
|
|
* responsible for the DESTINATION.
|
|
*/
|
|
goto allow;
|
|
}
|
|
allow:
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
ret = false;
|
|
goto out;
|
|
handled:
|
|
ret = true;
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
if (claim)
|
|
batadv_claim_put(claim);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
|
|
/**
|
|
* batadv_bla_claim_table_seq_print_text() - print the claim table in a seq file
|
|
* @seq: seq file to print on
|
|
* @offset: not used
|
|
*
|
|
* Return: always 0
|
|
*/
|
|
int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_bla_claim *claim;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct hlist_head *head;
|
|
u16 backbone_crc;
|
|
u32 i;
|
|
bool is_own;
|
|
u8 *primary_addr;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
primary_addr = primary_if->net_dev->dev_addr;
|
|
seq_printf(seq,
|
|
"Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
|
|
net_dev->name, primary_addr,
|
|
ntohs(bat_priv->bla.claim_dest.group));
|
|
seq_puts(seq,
|
|
" Client VID Originator [o] (CRC )\n");
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, head, hash_entry) {
|
|
backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
|
|
|
|
is_own = batadv_compare_eth(backbone_gw->orig,
|
|
primary_addr);
|
|
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
backbone_crc = backbone_gw->crc;
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
|
|
claim->addr, batadv_print_vid(claim->vid),
|
|
backbone_gw->orig,
|
|
(is_own ? 'x' : ' '),
|
|
backbone_crc);
|
|
|
|
batadv_backbone_gw_put(backbone_gw);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* batadv_bla_claim_dump_entry() - dump one entry of the claim table
|
|
* to a netlink socket
|
|
* @msg: buffer for the message
|
|
* @portid: netlink port
|
|
* @seq: Sequence number of netlink message
|
|
* @primary_if: primary interface
|
|
* @claim: entry to dump
|
|
*
|
|
* Return: 0 or error code.
|
|
*/
|
|
static int
|
|
batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct batadv_bla_claim *claim)
|
|
{
|
|
u8 *primary_addr = primary_if->net_dev->dev_addr;
|
|
u16 backbone_crc;
|
|
bool is_own;
|
|
void *hdr;
|
|
int ret = -EINVAL;
|
|
|
|
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
|
|
NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
|
|
if (!hdr) {
|
|
ret = -ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
is_own = batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_addr);
|
|
|
|
spin_lock_bh(&claim->backbone_gw->crc_lock);
|
|
backbone_crc = claim->backbone_gw->crc;
|
|
spin_unlock_bh(&claim->backbone_gw->crc_lock);
|
|
|
|
if (is_own)
|
|
if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
|
|
genlmsg_cancel(msg, hdr);
|
|
goto out;
|
|
}
|
|
|
|
if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
|
|
nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
|
|
nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
|
|
claim->backbone_gw->orig) ||
|
|
nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
|
|
backbone_crc)) {
|
|
genlmsg_cancel(msg, hdr);
|
|
goto out;
|
|
}
|
|
|
|
genlmsg_end(msg, hdr);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_claim_dump_bucket() - dump one bucket of the claim table
|
|
* to a netlink socket
|
|
* @msg: buffer for the message
|
|
* @portid: netlink port
|
|
* @seq: Sequence number of netlink message
|
|
* @primary_if: primary interface
|
|
* @head: bucket to dump
|
|
* @idx_skip: How many entries to skip
|
|
*
|
|
* Return: always 0.
|
|
*/
|
|
static int
|
|
batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct hlist_head *head, int *idx_skip)
|
|
{
|
|
struct batadv_bla_claim *claim;
|
|
int idx = 0;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, head, hash_entry) {
|
|
if (idx++ < *idx_skip)
|
|
continue;
|
|
|
|
ret = batadv_bla_claim_dump_entry(msg, portid, seq,
|
|
primary_if, claim);
|
|
if (ret) {
|
|
*idx_skip = idx - 1;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
*idx_skip = 0;
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_claim_dump() - dump claim table to a netlink socket
|
|
* @msg: buffer for the message
|
|
* @cb: callback structure containing arguments
|
|
*
|
|
* Return: message length.
|
|
*/
|
|
int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
|
|
{
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
int portid = NETLINK_CB(cb->skb).portid;
|
|
struct net *net = sock_net(cb->skb->sk);
|
|
struct net_device *soft_iface;
|
|
struct batadv_hashtable *hash;
|
|
struct batadv_priv *bat_priv;
|
|
int bucket = cb->args[0];
|
|
struct hlist_head *head;
|
|
int idx = cb->args[1];
|
|
int ifindex;
|
|
int ret = 0;
|
|
|
|
ifindex = batadv_netlink_get_ifindex(cb->nlh,
|
|
BATADV_ATTR_MESH_IFINDEX);
|
|
if (!ifindex)
|
|
return -EINVAL;
|
|
|
|
soft_iface = dev_get_by_index(net, ifindex);
|
|
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
bat_priv = netdev_priv(soft_iface);
|
|
hash = bat_priv->bla.claim_hash;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
while (bucket < hash->size) {
|
|
head = &hash->table[bucket];
|
|
|
|
if (batadv_bla_claim_dump_bucket(msg, portid,
|
|
cb->nlh->nlmsg_seq,
|
|
primary_if, head, &idx))
|
|
break;
|
|
bucket++;
|
|
}
|
|
|
|
cb->args[0] = bucket;
|
|
cb->args[1] = idx;
|
|
|
|
ret = msg->len;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
|
|
if (soft_iface)
|
|
dev_put(soft_iface);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
|
|
/**
|
|
* batadv_bla_backbone_table_seq_print_text() - print the backbone table in a
|
|
* seq file
|
|
* @seq: seq file to print on
|
|
* @offset: not used
|
|
*
|
|
* Return: always 0
|
|
*/
|
|
int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct hlist_head *head;
|
|
int secs, msecs;
|
|
u16 backbone_crc;
|
|
u32 i;
|
|
bool is_own;
|
|
u8 *primary_addr;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
primary_addr = primary_if->net_dev->dev_addr;
|
|
seq_printf(seq,
|
|
"Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
|
|
net_dev->name, primary_addr,
|
|
ntohs(bat_priv->bla.claim_dest.group));
|
|
seq_puts(seq, " Originator VID last seen (CRC )\n");
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
|
|
msecs = jiffies_to_msecs(jiffies -
|
|
backbone_gw->lasttime);
|
|
secs = msecs / 1000;
|
|
msecs = msecs % 1000;
|
|
|
|
is_own = batadv_compare_eth(backbone_gw->orig,
|
|
primary_addr);
|
|
if (is_own)
|
|
continue;
|
|
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
backbone_crc = backbone_gw->crc;
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
|
|
seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
|
|
backbone_gw->orig,
|
|
batadv_print_vid(backbone_gw->vid), secs,
|
|
msecs, backbone_crc);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a
|
|
* netlink socket
|
|
* @msg: buffer for the message
|
|
* @portid: netlink port
|
|
* @seq: Sequence number of netlink message
|
|
* @primary_if: primary interface
|
|
* @backbone_gw: entry to dump
|
|
*
|
|
* Return: 0 or error code.
|
|
*/
|
|
static int
|
|
batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
u8 *primary_addr = primary_if->net_dev->dev_addr;
|
|
u16 backbone_crc;
|
|
bool is_own;
|
|
int msecs;
|
|
void *hdr;
|
|
int ret = -EINVAL;
|
|
|
|
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
|
|
NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
|
|
if (!hdr) {
|
|
ret = -ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
|
|
|
|
spin_lock_bh(&backbone_gw->crc_lock);
|
|
backbone_crc = backbone_gw->crc;
|
|
spin_unlock_bh(&backbone_gw->crc_lock);
|
|
|
|
msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
|
|
|
|
if (is_own)
|
|
if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
|
|
genlmsg_cancel(msg, hdr);
|
|
goto out;
|
|
}
|
|
|
|
if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
|
|
backbone_gw->orig) ||
|
|
nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
|
|
nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
|
|
backbone_crc) ||
|
|
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
|
|
genlmsg_cancel(msg, hdr);
|
|
goto out;
|
|
}
|
|
|
|
genlmsg_end(msg, hdr);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to
|
|
* a netlink socket
|
|
* @msg: buffer for the message
|
|
* @portid: netlink port
|
|
* @seq: Sequence number of netlink message
|
|
* @primary_if: primary interface
|
|
* @head: bucket to dump
|
|
* @idx_skip: How many entries to skip
|
|
*
|
|
* Return: always 0.
|
|
*/
|
|
static int
|
|
batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct hlist_head *head, int *idx_skip)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
int idx = 0;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
|
|
if (idx++ < *idx_skip)
|
|
continue;
|
|
|
|
ret = batadv_bla_backbone_dump_entry(msg, portid, seq,
|
|
primary_if, backbone_gw);
|
|
if (ret) {
|
|
*idx_skip = idx - 1;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
*idx_skip = 0;
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_backbone_dump() - dump backbone table to a netlink socket
|
|
* @msg: buffer for the message
|
|
* @cb: callback structure containing arguments
|
|
*
|
|
* Return: message length.
|
|
*/
|
|
int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
|
|
{
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
int portid = NETLINK_CB(cb->skb).portid;
|
|
struct net *net = sock_net(cb->skb->sk);
|
|
struct net_device *soft_iface;
|
|
struct batadv_hashtable *hash;
|
|
struct batadv_priv *bat_priv;
|
|
int bucket = cb->args[0];
|
|
struct hlist_head *head;
|
|
int idx = cb->args[1];
|
|
int ifindex;
|
|
int ret = 0;
|
|
|
|
ifindex = batadv_netlink_get_ifindex(cb->nlh,
|
|
BATADV_ATTR_MESH_IFINDEX);
|
|
if (!ifindex)
|
|
return -EINVAL;
|
|
|
|
soft_iface = dev_get_by_index(net, ifindex);
|
|
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
bat_priv = netdev_priv(soft_iface);
|
|
hash = bat_priv->bla.backbone_hash;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
while (bucket < hash->size) {
|
|
head = &hash->table[bucket];
|
|
|
|
if (batadv_bla_backbone_dump_bucket(msg, portid,
|
|
cb->nlh->nlmsg_seq,
|
|
primary_if, head, &idx))
|
|
break;
|
|
bucket++;
|
|
}
|
|
|
|
cb->args[0] = bucket;
|
|
cb->args[1] = idx;
|
|
|
|
ret = msg->len;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_put(primary_if);
|
|
|
|
if (soft_iface)
|
|
dev_put(soft_iface);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_BATMAN_ADV_DAT
|
|
/**
|
|
* batadv_bla_check_claim() - check if address is claimed
|
|
*
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: mac address of which the claim status is checked
|
|
* @vid: the VLAN ID
|
|
*
|
|
* addr is checked if this address is claimed by the local device itself.
|
|
*
|
|
* Return: true if bla is disabled or the mac is claimed by the device,
|
|
* false if the device addr is already claimed by another gateway
|
|
*/
|
|
bool batadv_bla_check_claim(struct batadv_priv *bat_priv,
|
|
u8 *addr, unsigned short vid)
|
|
{
|
|
struct batadv_bla_claim search_claim;
|
|
struct batadv_bla_claim *claim = NULL;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
bool ret = true;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
return ret;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
return ret;
|
|
|
|
/* First look if the mac address is claimed */
|
|
ether_addr_copy(search_claim.addr, addr);
|
|
search_claim.vid = vid;
|
|
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
/* If there is a claim and we are not owner of the claim,
|
|
* return false.
|
|
*/
|
|
if (claim) {
|
|
if (!batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr))
|
|
ret = false;
|
|
batadv_claim_put(claim);
|
|
}
|
|
|
|
batadv_hardif_put(primary_if);
|
|
return ret;
|
|
}
|
|
#endif
|