Synnefo » snf-network

#!/bin/bash

function try {

  $1 &>/dev/null || true 

}

function clear_routed_setup_ipv4 {

 arptables -D OUTPUT -o $INTERFACE --opcode request -j mangle

 while ip rule del dev $INTERFACE; do :; done

 iptables -D FORWARD -i $INTERFACE -p udp --dport 67 -j DROP

}

function clear_routed_setup_ipv6 {

 while ip -6 rule del dev $INTERFACE; do :; done

}

function clear_routed_setup_firewall {

  for oldchain in protected unprotected limited; do

    iptables  -D FORWARD -o $INTERFACE -j $oldchain

    ip6tables -D FORWARD -o $INTERFACE -j $oldchain

  done

}

function clear_ebtables {

  runlocked $RUNLOCKED_OPTS ebtables -D FORWARD -i $INTERFACE -j $FROM

  runlocked $RUNLOCKED_OPTS ebtables -D INPUT -i $INTERFACE -j $FROM

  runlocked $RUNLOCKED_OPTS ebtables -D FORWARD -o $INTERFACE -j $TO

  runlocked $RUNLOCKED_OPTS ebtables -D OUTPUT -o $INTERFACE -j $TO

  runlocked $RUNLOCKED_OPTS ebtables -X $FROM

  runlocked $RUNLOCKED_OPTS ebtables -X $TO

}

function clear_nfdhcpd {

  rm $NFDHCPD_STATE_DIR/$INTERFACE

}

function routed_setup_ipv4 {

  if [ -z "$INTERFACE" -o -z "$NETWORK_GATEWAY" -o -z "$IP" -o -z "$TABLE" ]

  then

    return

  fi

	# mangle ARPs to come from the gw's IP

	arptables -A OUTPUT -o $INTERFACE --opcode request -j mangle --mangle-ip-s    "$NETWORK_GATEWAY"

	# route interface to the proper routing table

	ip rule add dev $INTERFACE table $TABLE

	# static route mapping IP -> INTERFACE

	ip route replace $IP proto static dev $INTERFACE table $TABLE

	# Enable proxy ARP

	echo 1 > /proc/sys/net/ipv4/conf/$INTERFACE/proxy_arp

  # Send GARP from host to upstream router

  get_uplink $TABLE

  echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind

  hooks-log $0 "arping  -c3 -I $UPLINK -U $IP"

  arping  -c3 -I $UPLINK -U $IP

  echo 0 > /proc/sys/net/ipv4/ip_nonlocal_bind

}

function routed_setup_ipv6 {

	# Add a routing entry for the eui-64

  get_uplink $TABLE "-6"

  get_eui64 $MAC $NETWORK_SUBNET6

  if [ -z "$EUI64" -o -z "$TABLE" -o -z "$INTERFACE" -o -z "$UPLINK" ]

  then

    return

  fi

	ip -6 rule add dev $INTERFACE table $TABLE

	ip -6 ro replace $EUI64/128 dev $INTERFACE table $TABLE

	ip -6 neigh add proxy $EUI64 dev $UPLINK

	# disable proxy NDP since we're handling this on userspace

	# this should be the default, but better safe than sorry

	echo 0 > /proc/sys/net/ipv6/conf/$INTERFACE/proxy_ndp

  # Send Unsolicited Neighbor Advertisement

  hooks-log $0 "ndsend $EUI64 $UPLINK"

  ndsend $EUI64 $UPLINK

}

# pick a firewall profile per NIC, based on tags (and apply it)

function routed_setup_firewall {

	# for latest ganeti there is no need to check other but uuid

	ifprefixindex="synnefo:network:$INTERFACE_INDEX:"

	ifprefixname="synnefo:network:$INTERFACE_NAME:"

	ifprefixuuid="synnefo:network:$INTERFACE_UUID:"

	for tag in $TAGS; do

		tag=${tag#$ifprefixindex}

		tag=${tag#$ifprefixname}

		tag=${tag#$ifprefixuuid}

		case $tag in

		protected)

			chain=protected

		;;

		unprotected)

			chain=unprotected

		;;

		limited)

			chain=limited

		;;

		esac

	done

	if [ "x$chain" != "x" ]; then

		iptables  -A FORWARD -o $INTERFACE -j $chain

		ip6tables -A FORWARD -o $INTERFACE -j $chain

	fi

}

function init_ebtables {

  runlocked $RUNLOCKED_OPTS ebtables -N $FROM -P RETURN

  runlocked $RUNLOCKED_OPTS ebtables -A FORWARD -i $INTERFACE -j $FROM

  # This is needed for multicast packets

  runlocked $RUNLOCKED_OPTS ebtables -A INPUT -i $INTERFACE -j $FROM

  runlocked $RUNLOCKED_OPTS ebtables -N $TO -P RETURN

  runlocked $RUNLOCKED_OPTS ebtables -A FORWARD -o $INTERFACE -j $TO

  # This is needed for multicast packets

  runlocked $RUNLOCKED_OPTS ebtables -A OUTPUT -o $INTERFACE -j $TO

}

function setup_ebtables {

  # do not allow changes in ip-mac pair

  if [ -n "$IP" ]; then

    :; # runlocked $RUNLOCKED_OPTS ebtables -A $FROM --ip-source \! $IP -p ipv4 -j DROP

  fi

  runlocked $RUNLOCKED_OPTS ebtables -A $FROM -s \! $MAC -j DROP

  # accept dhcp responses from host (nfdhcpd)

  # this is actually not needed because nfdhcpd opens a socket and binds is with

  # tap interface so dhcp response does not go through bridge

  # runlocked $RUNLOCKED_OPTS ebtables -A $TO -s $INDEV_MAC -p ipv4 --ip-protocol=udp  --ip-destination-port=68 -j ACCEPT

  # allow only packets from the same mac prefix

  runlocked $RUNLOCKED_OPTS ebtables -A $TO -s \! $MAC/$MAC_MASK -j DROP

}

function setup_masq {

  # allow packets from/to router (for masquerading)

  # runlocked $RUNLOCKED_OPTS ebtables -A $TO -s $NODE_MAC -j ACCEPT

  # runlocked $RUNLOCKED_OPTS ebtables -A INPUT -i $INTERFACE -j $FROM

  # runlocked $RUNLOCKED_OPTS ebtables -A OUTPUT -o $INTERFACE -j $TO

  return

}

function setup_nfdhcpd {

	umask 022

  FILE=$NFDHCPD_STATE_DIR/$INTERFACE

  #IFACE is the interface from which the packet seems to arrive

  #needed in bridged mode where the packets seems to arrive from the

  #bridge and not from the tap

	cat >$FILE <<EOF

INDEV=$INDEV

IP=$IP

MAC=$MAC

HOSTNAME=$INSTANCE

TAGS="$TAGS"

GATEWAY=$NETWORK_GATEWAY

SUBNET=$NETWORK_SUBNET

GATEWAY6=$NETWORK_GATEWAY6

SUBNET6=$NETWORK_SUBNET6

EUI64=$($MAC2EUI64 $MAC $NETWORK_SUBNET6 2>/dev/null)

EOF

}

function get_uplink {

  local table=$1

  local version=$2

  UPLINK=$(ip "$version" route list table "$table" | grep "default via" | awk '{print $5}')

}

# Because we do not have IPv6 value in our environment

# we caclulate it based on the NIC's MAC and the IPv6 subnet (if any)

# first argument MAC second IPv6 subnet

# Changes global value EUI64

get_eui64 () {

  local mac=$1

  local prefix=$2

  if [ -z "$prefix" ]; then

    EUI64=

  else

    EUI64=$($MAC2EUI64 $mac $prefix)

  fi

}