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Set -w flag on all iptables calls during master startup #55945

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Nov 18, 2017
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Set -w flag on all iptables calls during master startup #55945

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26 changes: 13 additions & 13 deletions cluster/gce/gci/configure-helper.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -41,38 +41,38 @@ function config-ip-firewall {

# The GCI image has host firewall which drop most inbound/forwarded packets.
# We need to add rules to accept all TCP/UDP/ICMP packets.
if iptables -L INPUT | grep "Chain INPUT (policy DROP)" > /dev/null; then
if iptables -w -L INPUT | grep "Chain INPUT (policy DROP)" > /dev/null; then
echo "Add rules to accept all inbound TCP/UDP/ICMP packets"
iptables -A INPUT -w -p TCP -j ACCEPT
iptables -A INPUT -w -p UDP -j ACCEPT
iptables -A INPUT -w -p ICMP -j ACCEPT
fi
if iptables -L FORWARD | grep "Chain FORWARD (policy DROP)" > /dev/null; then
if iptables -w -L FORWARD | grep "Chain FORWARD (policy DROP)" > /dev/null; then
echo "Add rules to accept all forwarded TCP/UDP/ICMP packets"
iptables -A FORWARD -w -p TCP -j ACCEPT
iptables -A FORWARD -w -p UDP -j ACCEPT
iptables -A FORWARD -w -p ICMP -j ACCEPT
fi

iptables -N KUBE-METADATA-SERVER
iptables -I FORWARD -p tcp -d 169.254.169.254 --dport 80 -j KUBE-METADATA-SERVER
iptables -w -N KUBE-METADATA-SERVER
iptables -w -I FORWARD -p tcp -d 169.254.169.254 --dport 80 -j KUBE-METADATA-SERVER

if [[ "${ENABLE_METADATA_CONCEALMENT:-}" == "true" ]]; then
iptables -A KUBE-METADATA-SERVER -j DROP
iptables -w -A KUBE-METADATA-SERVER -j DROP
fi

# Flush iptables nat table
iptables -t nat -F || true
iptables -w -t nat -F || true

echo "Add rules for ip masquerade"
if [[ "${NON_MASQUERADE_CIDR:-}" == "0.0.0.0/0" ]]; then
iptables -t nat -N IP-MASQ
iptables -t nat -A POSTROUTING -m comment --comment "ip-masq: ensure nat POSTROUTING directs all non-LOCAL destination traffic to our custom IP-MASQ chain" -m addrtype ! --dst-type LOCAL -j IP-MASQ
iptables -t nat -A IP-MASQ -d 169.254.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -t nat -A IP-MASQ -d 10.0.0.0/8 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -t nat -A IP-MASQ -d 172.16.0.0/12 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -t nat -A IP-MASQ -d 192.168.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -t nat -A IP-MASQ -m comment --comment "ip-masq: outbound traffic is subject to MASQUERADE (must be last in chain)" -j MASQUERADE
iptables -w -t nat -N IP-MASQ
iptables -w -t nat -A POSTROUTING -m comment --comment "ip-masq: ensure nat POSTROUTING directs all non-LOCAL destination traffic to our custom IP-MASQ chain" -m addrtype ! --dst-type LOCAL -j IP-MASQ
iptables -w -t nat -A IP-MASQ -d 169.254.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -w -t nat -A IP-MASQ -d 10.0.0.0/8 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -w -t nat -A IP-MASQ -d 172.16.0.0/12 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -w -t nat -A IP-MASQ -d 192.168.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN
iptables -w -t nat -A IP-MASQ -m comment --comment "ip-masq: outbound traffic is subject to MASQUERADE (must be last in chain)" -j MASQUERADE
fi
}

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