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vpc-nat-gateway: use iptables-legacy for centos 7 #4428

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Aug 22, 2024
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vpc-nat-gateway: use iptables-legacy for centos 7 #4428

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2 changes: 1 addition & 1 deletion dist/images/vpcnatgateway/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ RUN set -ex \
&& apk add --no-cache \
bash \
iproute2 \
iptables \
iptables iptables-legacy \
iputils \
tcpdump \
conntrack-tools
Expand Down
70 changes: 39 additions & 31 deletions dist/images/vpcnatgateway/nat-gateway.sh
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Original file line number Diff line number Diff line change
@@ -1,5 +1,13 @@
#!/usr/bin/env bash

iptables_cmd=$(which iptables)
iptables_save_cmd=$(which iptables-save)
if iptables-legacy -t nat -S INPUT 1 2>/dev/null; then
# use iptables-legacy for centos 7
iptables_cmd=$(which iptables-legacy)
iptables_save_cmd=$(which iptables-legacy-save)
fi

function exec_cmd() {
cmd=${@:1:${#}}
$cmd
Expand All @@ -11,7 +19,7 @@ function exec_cmd() {
}

function check_inited() {
iptables-save -t nat | grep SNAT_FILTER | grep SHARED_SNAT
$iptables_save_cmd -t nat | grep SNAT_FILTER | grep SHARED_SNAT
if [ $? -ne 0 ]; then
>&2 echo "nat gateway not initialized"
exit 1
Expand All @@ -20,30 +28,30 @@ function check_inited() {

function init() {
# run once is enough
iptables-save | grep DNAT_FILTER && exit 0
$iptables_save_cmd | grep DNAT_FILTER && exit 0
# add static chain
# this also a flag to make sure init once
iptables -t nat -N DNAT_FILTER
$iptables_cmd -t nat -N DNAT_FILTER

# 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
$iptables_cmd -t nat -N SNAT_FILTER
$iptables_cmd -t nat -N EXCLUSIVE_DNAT # floatingIp DNAT
$iptables_cmd -t nat -N EXCLUSIVE_SNAT # floatingIp SNAT
$iptables_cmd -t nat -N SHARED_DNAT
$iptables_cmd -t nat -N SHARED_SNAT

$iptables_cmd -t nat -A PREROUTING -j DNAT_FILTER
$iptables_cmd -t nat -A DNAT_FILTER -j EXCLUSIVE_DNAT
$iptables_cmd -t nat -A DNAT_FILTER -j SHARED_DNAT

$iptables_cmd -t nat -A POSTROUTING -j SNAT_FILTER
$iptables_cmd -t nat -A SNAT_FILTER -j EXCLUSIVE_SNAT
$iptables_cmd -t nat -A SNAT_FILTER -j SHARED_SNAT
}


function get_iptables_version() {
exec_cmd "iptables --version"
exec_cmd "$iptables_cmd --version"
}

function add_vpc_internal_route() {
Expand Down Expand Up @@ -121,9 +129,9 @@ function add_floating_ip() {
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"
$iptables_save_cmd | grep EXCLUSIVE_DNAT | grep -w "\-d $eip/32" | grep destination && exit 0
exec_cmd "$iptables_cmd -t nat -A EXCLUSIVE_DNAT -d $eip -j DNAT --to-destination $internalIp"
exec_cmd "$iptables_cmd -t nat -A EXCLUSIVE_SNAT -s $internalIp -j SNAT --to-source $eip"
done
}

Expand All @@ -136,10 +144,10 @@ function del_floating_ip() {
eip=(${arr[0]//\// })
internalIp=${arr[1]}
# check if already exist
iptables-save | grep "EXCLUSIVE_DNAT" | grep -w "\-d $eip/32" | grep "destination"
$iptables_save_cmd | 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 $eip"
exec_cmd "$iptables_cmd -t nat -D EXCLUSIVE_DNAT -d $eip -j DNAT --to-destination $internalIp"
exec_cmd "$iptables_cmd -t nat -D EXCLUSIVE_SNAT -s $internalIp -j SNAT --to-source $eip"
conntrack -D -d $eip 2>/dev/nul || true
fi
done
Expand All @@ -156,8 +164,8 @@ function add_snat() {
internalCIDR=${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 -o net1 -s $internalCIDR -j SNAT --to-source $eip $randomFullyOption"
$iptables_save_cmd | grep SHARED_SNAT | grep "\-s $internalCIDR" | grep "source $eip" && exit 0
exec_cmd "$iptables_cmd -t nat -A SHARED_SNAT -o net1 -s $internalCIDR -j SNAT --to-source $eip $randomFullyOption"
done
}
function del_snat() {
Expand All @@ -170,10 +178,10 @@ function del_snat() {
eip=(${arr[0]//\// })
internalCIDR=${arr[1]}
# check if already exist
ruleMatch=$(iptables-save | grep "SHARED_SNAT" | grep "\-s $internalCIDR" | grep "source $eip")
ruleMatch=$($iptables_save_cmd | 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 $ruleMatch"
exec_cmd "$iptables_cmd -t nat -D $ruleMatch"
fi
done
}
Expand All @@ -191,8 +199,8 @@ function add_dnat() {
internalIp=${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"
$iptables_save_cmd | 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_cmd -t nat -A SHARED_DNAT -p $protocol -d $eip --dport $dport -j DNAT --to-destination $internalIp:$internalPort"
done
}

Expand All @@ -209,9 +217,9 @@ function del_dnat() {
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"
$iptables_save_cmd | 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"
exec_cmd "$iptables_cmd -t nat -D SHARED_DNAT -p $protocol -d $eip --dport $dport -j DNAT --to-destination $internalIp:$internalPort"
fi
done
}
Expand Down
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