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#!/bin/sh
# Script to set up one of the nodes as a NAT gateway for all other nodes.
# This is used to ensure that all nodes in the cluster can still originate
# traffic to the external network even if there are no public addresses
# available.
#
[ -n "$CTDB_BASE" ] || \
export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")
. $CTDB_BASE/functions
loadconfig
[ -n "$CTDB_NATGW_NODES" ] || exit 0
export CTDB_NATGW_NODES
natgw_check_config ()
{
[ -r "$CTDB_NATGW_NODES" ] || \
die "error: CTDB_NATGW_NODES=${CTDB_NATGW_NODES} unreadable"
[ -n "$CTDB_NATGW_PUBLIC_IP" ] || \
die "Invalid configuration: CTDB_NATGW_PUBLIC_IP not set"
[ -n "$CTDB_NATGW_PUBLIC_IFACE" ] || \
die "Invalid configuration: CTDB_NATGW_PUBLIC_IFACE not set"
[ -n "$CTDB_NATGW_PRIVATE_NETWORK" ] || \
die "Invalid configuration: CTDB_NATGW_PRIVATE_NETWORK not set"
# The default is to create a single default route
[ -n "$CTDB_NATGW_STATIC_ROUTES" ] || CTDB_NATGW_STATIC_ROUTES="0.0.0.0/0"
}
natgw_set_capability ()
{
# Set NATGW capability depending on configuration
if [ "$CTDB_NATGW_SLAVE_ONLY" = "yes" ] ; then
ctdb setnatgwstate off
else
ctdb setnatgwstate on
fi
}
natgw_clear ()
{
_ip="${CTDB_NATGW_PUBLIC_IP%/*}"
_maskbits="${CTDB_NATGW_PUBLIC_IP#*/}"
delete_ip_from_iface \
$CTDB_NATGW_PUBLIC_IFACE $_ip $_maskbits >/dev/null 2>&1
for _net_gw in $CTDB_NATGW_STATIC_ROUTES ; do
_net="${_net_gw%@*}"
ip route del "$_net" metric 10 >/dev/null 2>/dev/null
done
# Delete the masquerading setup from a previous iteration where we
# were the NAT-GW
iptables -D POSTROUTING -t nat \
-s $CTDB_NATGW_PRIVATE_NETWORK ! -d $CTDB_NATGW_PRIVATE_NETWORK \
-j MASQUERADE >/dev/null 2>/dev/null
iptables -D INPUT -p tcp --syn -d $_ip/32 -j REJECT 2>/dev/null
}
natgw_set_master ()
{
set_proc sys/net/ipv4/ip_forward 1
iptables -A POSTROUTING -t nat \
-s $CTDB_NATGW_PRIVATE_NETWORK ! -d $CTDB_NATGW_PRIVATE_NETWORK \
-j MASQUERADE
# block all incoming connections to the NATGW IP address
ctdb_natgw_public_ip_host="${CTDB_NATGW_PUBLIC_IP%/*}/32"
iptables -D INPUT -p tcp --syn \
-d $ctdb_natgw_public_ip_host -j REJECT 2>/dev/null
iptables -I INPUT -p tcp --syn \
-d $ctdb_natgw_public_ip_host -j REJECT 2>/dev/null
ip addr add $CTDB_NATGW_PUBLIC_IP dev $CTDB_NATGW_PUBLIC_IFACE
for _net_gw in $CTDB_NATGW_STATIC_ROUTES ; do
_net="${_net_gw%@*}"
if [ "$_net" != "$_net_gw" ] ; then
_gw="${_net_gw#*@}"
else
_gw="$CTDB_NATGW_DEFAULT_GATEWAY"
fi
[ -n "$_gw" ] || continue
ip route add "$_net" metric 10 via "$_gw"
done
}
natgw_set_slave ()
{
_natgwip="$1"
for _net_gw in $CTDB_NATGW_STATIC_ROUTES ; do
_net="${_net_gw%@*}"
ip route add "$_net" via "$_natgwip" metric 10
done
# Make sure winbindd does not stay bound to this address if we are
# no longer NATGW master
smbcontrol winbindd ip-dropped $CTDB_NATGW_PUBLIC_IP >/dev/null 2>&1
}
natgw_ensure_master ()
{
_event="$1"
set -- $(ctdb natgwlist)
natgwmaster="${1:--1}" # Default is -1 if natgwlist fails
natgwip="$2"
if [ "$natgwmaster" = "-1" ]; then
# Fail...
die "There is no NATGW master node"
fi
}
case "$1" in
setup)
natgw_check_config
natgw_set_capability
;;
startup)
natgw_check_config
# Error if CTDB_NATGW_PUBLIC_IP is listed in public addresses
ip_pat=$(echo "$CTDB_NATGW_PUBLIC_IP" | sed -e 's@\.@\\.@g')
if grep -q "^${ip_pat}[[:space:]]" \
"${CTDB_PUBLIC_ADDRESSES:-${CTDB_BASE}/public_addresses}" ; then
die "ERROR: CTDB_NATGW_PUBLIC_IP same as a public address"
fi
# do not send out arp requests from loopback addresses
set_proc sys/net/ipv4/conf/all/arp_announce 2
;;
updatenatgw|ipreallocated)
natgw_check_config
mypnn=$(ctdb pnn | cut -d: -f2)
natgw_set_capability
natgw_ensure_master "$1"
natgw_clear
if [ "$mypnn" = "$natgwmaster" ]; then
natgw_set_master
else
natgw_set_slave "$natgwip"
fi
# flush our route cache
set_proc sys/net/ipv4/route/flush 1
;;
shutdown|removenatgw)
natgw_check_config
natgw_clear
;;
monitor)
natgw_check_config
natgw_set_capability
natgw_ensure_master "$1"
;;
*)
ctdb_standard_event_handler "@"
;;
esac
exit 0
|
