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nat-gateway.sh
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nat-gateway.sh
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#!/usr/bin/env bash
function exec_cmd() {
cmd=${@:1:${#}}
$cmd
ret=$?
if [ $ret -ne 0 ]; then
echo "failed to exec \"$cmd\""
exit $ret
fi
}
function init() {
# run once is enough
iptables-save | grep DNAT_FILTER && exit 0
# add static chain
# this also a flag to make sure init once
iptables -t nat -N DNAT_FILTER
ip link set net1 up
ip link set dev net1 arp off
# add static chain
iptables -t nat -N SNAT_FILTER
iptables -t nat -N EXCLUSIVE_DNAT # floatingIp DNAT
iptables -t nat -N EXCLUSIVE_SNAT # floatingIp SNAT
iptables -t nat -N SHARED_DNAT
iptables -t nat -N SHARED_SNAT
iptables -t nat -A PREROUTING -j DNAT_FILTER
iptables -t nat -A DNAT_FILTER -j EXCLUSIVE_DNAT
iptables -t nat -A DNAT_FILTER -j SHARED_DNAT
iptables -t nat -A POSTROUTING -j SNAT_FILTER
iptables -t nat -A SNAT_FILTER -j EXCLUSIVE_SNAT
iptables -t nat -A SNAT_FILTER -j SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
cidr=${arr[0]}
nextHop=${arr[1]}
exec_cmd "ip route replace $cidr via $nextHop dev eth0"
done
}
function get_iptables_version() {
exec_cmd "iptables --version"
}
function add_vpc_internal_route() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
cidr=${arr[0]}
nextHop=${arr[1]}
exec_cmd "ip route replace $cidr via $nextHop dev eth0"
done
}
function del_vpc_internal_route() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
cidr=${arr[0]}
exec_cmd "ip route del $cidr dev eth0"
done
}
function add_vpc_external_route() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
cidr=${arr[0]}
nextHop=${arr[1]}
exec_cmd "ip route replace default via $nextHop dev net1"
# replace default route to dev net1 to access public network
# TODO: use multus macvlan to provider eth0 to skip this external route
sleep 1
ip route | grep "default via $nextHop dev net1"
# make sure route is added
# gw lost probably occured when you create >10 nat gw pod at the same time
# so add the same logic again in every eip add process
done
}
function del_vpc_external_route() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
# never do this, if deleted, will cause error
# for rule in $@
# do
# arr=(${rule//,/ })
# cidr=${arr[0]}
# exec_cmd "ip route del $cidr dev net1"
# sleep 1
# exec_cmd "ip route del default dev net1"
# done
}
function add_eip() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=${arr[0]}
eip_without_prefix=(${eip//\// })
eip_network=$(ipcalc -n $eip | awk -F '=' '{print $2}')
eip_prefix=$(ipcalc -p $eip | awk -F '=' '{print $2}')
gateway=${arr[1]}
exec_cmd "ip addr replace $eip dev net1"
ip link set dev net1 arp on
# gw may lost, even if add_vpc_external_route add route successfully
exec_cmd "ip route replace default via $gateway dev net1"
ip route | grep "default via $gateway dev net1"
exec_cmd "arping -I net1 -c 3 -D $eip_without_prefix"
done
}
function del_eip() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=${arr[0]}
ipCidr=`ip addr show net1 | grep $eip | awk '{print $2 }'`
if [ -n "$ipCidr" ]; then
exec_cmd "ip addr del $ipCidr dev net1"
fi
done
}
function add_floating_ip() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
internalIp=${arr[1]}
# check if already exist
iptables-save | grep "EXCLUSIVE_DNAT" | grep -w "\-d $eip/32" | grep "destination" && exit 0
exec_cmd "iptables -t nat -A EXCLUSIVE_DNAT -d $eip -j DNAT --to-destination $internalIp"
exec_cmd "iptables -t nat -A EXCLUSIVE_SNAT -s $internalIp -j SNAT --to-source $eip"
done
}
function del_floating_ip() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
internalIp=${arr[1]}
# check if already exist
iptables-save | grep "EXCLUSIVE_DNAT" | grep -w "\-d $eip/32" | grep "destination"
if [ "$?" -eq 0 ];then
exec_cmd "iptables -t nat -D EXCLUSIVE_DNAT -d $eip -j DNAT --to-destination $internalIp"
exec_cmd "iptables -t nat -D EXCLUSIVE_SNAT -s $internalIp -j SNAT --to-source $eip"
conntrack -D -d $eip 2>/dev/nul || true
fi
done
}
function add_snat() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
# iptables -t nat -F SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
internalCIDR=${arr[1]}
randomFullyOption=${arr[2]}
# check if already exist
iptables-save | grep "SHARED_SNAT" | grep "\-s $internalCIDR" | grep "source $eip" && exit 0
exec_cmd "iptables -t nat -A SHARED_SNAT -s $internalCIDR -j SNAT --to-source $eip $randomFullyOption"
done
}
function del_snat() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
# iptables -t nat -F SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
internalCIDR=${arr[1]}
# check if already exist
ruleMatch=$(iptables-save | grep "SHARED_SNAT" | grep "\-s $internalCIDR" | grep "source $eip")
if [ "$?" -eq 0 ];then
ruleMatch=$(echo $ruleMatch | sed 's/-A //')
exec_cmd "iptables -t nat -D $ruleMatch"
fi
done
}
function add_dnat() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
dport=${arr[1]}
protocol=${arr[2]}
internalIp=${arr[3]}
internalPort=${arr[4]}
# check if already exist
iptables-save | grep "SHARED_DNAT" | grep -w "\-d $eip/32" | grep "p $protocol" | grep -w "dport $dport"| grep -w "destination $internalIp:$internalPort" && exit 0
exec_cmd "iptables -t nat -A SHARED_DNAT -p $protocol -d $eip --dport $dport -j DNAT --to-destination $internalIp:$internalPort"
done
}
function del_dnat() {
# make sure inited
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
for rule in $@
do
arr=(${rule//,/ })
eip=(${arr[0]//\// })
dport=${arr[1]}
protocol=${arr[2]}
internalIp=${arr[3]}
internalPort=${arr[4]}
# check if already exist
iptables-save | grep "SHARED_DNAT" | grep -w "\-d $eip/32" | grep "p $protocol" | grep -w "dport $dport"| grep -w "destination $internalIp:$internalPort"
if [ "$?" -eq 0 ];then
exec_cmd "iptables -t nat -D SHARED_DNAT -p $protocol -d $eip --dport $dport -j DNAT --to-destination $internalIp:$internalPort"
fi
done
}
rules=${@:2:${#}}
opt=$1
case $opt in
init)
echo "init $rules"
init $rules
;;
subnet-route-add)
echo "subnet-route-add $rules"
add_vpc_internal_route $rules
;;
subnet-route-del)
echo "subnet-route-del $rules"
del_vpc_internal_route $rules
;;
ext-subnet-route-add)
echo "ext-subnet-route-add $rules"
add_vpc_external_route $rules
;;
ext-subnet-route-del)
echo "ext-subnet-route-del $rules"
del_vpc_external_route $rules
;;
eip-add)
echo "eip-add $rules"
add_eip $rules
;;
eip-del)
echo "eip-del $rules"
del_eip $rules
;;
dnat-add)
echo "dnat-add $rules"
add_dnat $rules
;;
dnat-del)
echo "dnat-del $rules"
del_dnat $rules
;;
snat-add)
echo "snat-add $rules"
add_snat $rules
;;
snat-del)
echo "snat-del $rules"
del_snat $rules
;;
floating-ip-add)
echo "floating-ip-add $rules"
add_floating_ip $rules
;;
floating-ip-del)
echo "floating-ip-del $rules"
del_floating_ip $rules
;;
get-iptables-version)
echo "get-iptables-version $rules"
get_iptables_version $rules
;;
*)
echo "Usage: $0 [init|subnet-route-add|subnet-route-del|eip-add|eip-del|floating-ip-add|floating-ip-del|dnat-add|dnat-del|snat-add|snat-del] ..."
exit 1
;;
esac