307 lines
8.9 KiB
C
307 lines
8.9 KiB
C
/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors:
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*
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* Linus Lüssing, Marek Lindner
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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 "bat_v_elp.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/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/fs.h>
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#include <linux/if_ether.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/random.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/skbuff.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include "bat_algo.h"
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#include "bat_v_ogm.h"
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#include "hard-interface.h"
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#include "originator.h"
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#include "packet.h"
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#include "routing.h"
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#include "send.h"
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/**
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* batadv_v_elp_start_timer - restart timer for ELP periodic work
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* @hard_iface: the interface for which the timer has to be reset
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*/
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static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface)
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{
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unsigned int msecs;
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msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER;
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msecs += prandom_u32() % (2 * BATADV_JITTER);
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queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq,
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msecs_to_jiffies(msecs));
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}
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/**
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* batadv_v_elp_periodic_work - ELP periodic task per interface
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* @work: work queue item
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*
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* Emits broadcast ELP message in regular intervals.
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*/
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static void batadv_v_elp_periodic_work(struct work_struct *work)
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{
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struct batadv_hard_iface *hard_iface;
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struct batadv_hard_iface_bat_v *bat_v;
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struct batadv_elp_packet *elp_packet;
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struct batadv_priv *bat_priv;
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struct sk_buff *skb;
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u32 elp_interval;
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bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work);
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hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v);
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bat_priv = netdev_priv(hard_iface->soft_iface);
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if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
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goto out;
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/* we are in the process of shutting this interface down */
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if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
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(hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
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goto out;
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/* the interface was enabled but may not be ready yet */
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if (hard_iface->if_status != BATADV_IF_ACTIVE)
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goto restart_timer;
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skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC);
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if (!skb)
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goto restart_timer;
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elp_packet = (struct batadv_elp_packet *)skb->data;
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elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno));
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elp_interval = atomic_read(&hard_iface->bat_v.elp_interval);
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elp_packet->elp_interval = htonl(elp_interval);
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Sending broadcast ELP packet on interface %s, seqno %u\n",
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hard_iface->net_dev->name,
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atomic_read(&hard_iface->bat_v.elp_seqno));
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batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
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atomic_inc(&hard_iface->bat_v.elp_seqno);
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restart_timer:
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batadv_v_elp_start_timer(hard_iface);
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out:
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return;
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}
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/**
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* batadv_v_elp_iface_enable - setup the ELP interface private resources
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* @hard_iface: interface for which the data has to be prepared
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*
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* Return: 0 on success or a -ENOMEM in case of failure.
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*/
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int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_elp_packet *elp_packet;
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unsigned char *elp_buff;
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u32 random_seqno;
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size_t size;
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int res = -ENOMEM;
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size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN;
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hard_iface->bat_v.elp_skb = dev_alloc_skb(size);
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if (!hard_iface->bat_v.elp_skb)
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goto out;
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skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN);
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elp_buff = skb_push(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN);
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elp_packet = (struct batadv_elp_packet *)elp_buff;
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memset(elp_packet, 0, BATADV_ELP_HLEN);
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elp_packet->packet_type = BATADV_ELP;
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elp_packet->version = BATADV_COMPAT_VERSION;
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/* randomize initial seqno to avoid collision */
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get_random_bytes(&random_seqno, sizeof(random_seqno));
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atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno);
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atomic_set(&hard_iface->bat_v.elp_interval, 500);
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INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq,
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batadv_v_elp_periodic_work);
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batadv_v_elp_start_timer(hard_iface);
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res = 0;
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out:
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return res;
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}
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/**
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* batadv_v_elp_iface_disable - release ELP interface private resources
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* @hard_iface: interface for which the resources have to be released
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*/
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void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface)
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{
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cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq);
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dev_kfree_skb(hard_iface->bat_v.elp_skb);
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hard_iface->bat_v.elp_skb = NULL;
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}
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/**
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* batadv_v_elp_primary_iface_set - change internal data to reflect the new
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* primary interface
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* @primary_iface: the new primary interface
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*/
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void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface)
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{
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struct batadv_hard_iface *hard_iface;
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struct batadv_elp_packet *elp_packet;
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struct sk_buff *skb;
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/* update orig field of every elp iface belonging to this mesh */
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (primary_iface->soft_iface != hard_iface->soft_iface)
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continue;
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if (!hard_iface->bat_v.elp_skb)
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continue;
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skb = hard_iface->bat_v.elp_skb;
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elp_packet = (struct batadv_elp_packet *)skb->data;
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ether_addr_copy(elp_packet->orig,
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primary_iface->net_dev->dev_addr);
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}
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rcu_read_unlock();
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}
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/**
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* batadv_v_elp_neigh_update - update an ELP neighbour node
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* @bat_priv: the bat priv with all the soft interface information
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* @neigh_addr: the neighbour interface address
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* @if_incoming: the interface the packet was received through
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* @elp_packet: the received ELP packet
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*
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* Updates the ELP neighbour node state with the data received within the new
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* ELP packet.
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*/
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static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv,
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u8 *neigh_addr,
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struct batadv_hard_iface *if_incoming,
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struct batadv_elp_packet *elp_packet)
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{
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struct batadv_neigh_node *neigh;
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struct batadv_orig_node *orig_neigh;
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struct batadv_hardif_neigh_node *hardif_neigh;
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s32 seqno_diff;
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s32 elp_latest_seqno;
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orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig);
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if (!orig_neigh)
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return;
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neigh = batadv_neigh_node_new(orig_neigh, if_incoming, neigh_addr);
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if (!neigh)
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goto orig_free;
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hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr);
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if (!hardif_neigh)
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goto neigh_free;
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elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno;
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seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno;
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/* known or older sequence numbers are ignored. However always adopt
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* if the router seems to have been restarted.
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*/
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if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE)
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goto hardif_free;
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neigh->last_seen = jiffies;
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hardif_neigh->last_seen = jiffies;
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hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno);
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hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval);
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hardif_free:
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if (hardif_neigh)
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batadv_hardif_neigh_put(hardif_neigh);
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neigh_free:
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if (neigh)
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batadv_neigh_node_put(neigh);
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orig_free:
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if (orig_neigh)
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batadv_orig_node_put(orig_neigh);
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}
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/**
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* batadv_v_elp_packet_recv - main ELP packet handler
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* @skb: the received packet
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* @if_incoming: the interface this packet was received through
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*
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* Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly
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* processed or NET_RX_DROP in case of failure.
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*/
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int batadv_v_elp_packet_recv(struct sk_buff *skb,
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struct batadv_hard_iface *if_incoming)
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{
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struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
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struct batadv_elp_packet *elp_packet;
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struct batadv_hard_iface *primary_if;
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struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
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bool ret;
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ret = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN);
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if (!ret)
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return NET_RX_DROP;
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if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
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return NET_RX_DROP;
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/* did we receive a B.A.T.M.A.N. V ELP packet on an interface
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* that does not have B.A.T.M.A.N. V ELP enabled ?
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*/
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if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0)
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return NET_RX_DROP;
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elp_packet = (struct batadv_elp_packet *)skb->data;
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Received ELP packet from %pM seqno %u ORIG: %pM\n",
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ethhdr->h_source, ntohl(elp_packet->seqno),
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elp_packet->orig);
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming,
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elp_packet);
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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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consume_skb(skb);
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return NET_RX_SUCCESS;
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}
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