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|
#!/bin/sh
. /lib/functions.sh
. /lib/functions/network.sh
if [ "$ACTION" = "remove" ]; then
delete_rules_by_comment() {
local table="$1"
local chain="$2"
local comment="$3"
iptables -t "$table" --line-numbers -nL "$chain" 2>/dev/null | \
sed -e '
1d;
1! {
\#^[0-9]\+ .* /\* '"$comment"' \*/.*$# {
s/ .*$//;
G; h;
}
};
$!d;
' | xargs -n1 iptables -t "$table" -D "$chain" 2>/dev/null
}
delete_rules_by_comment nat nat_reflection_in "$INTERFACE"
delete_rules_by_comment nat nat_reflection_out "$INTERFACE"
delete_rules_by_comment filter nat_reflection_fwd "$INTERFACE"
elif [ "$ACTION" = "add" ]; then
prepare_chains() {
iptables -t nat -N nat_reflection_in 2>/dev/null && {
iptables -t nat -A prerouting_rule -j nat_reflection_in
}
iptables -t nat -N nat_reflection_out 2>/dev/null && {
iptables -t nat -A postrouting_rule -j nat_reflection_out
}
iptables -t filter -N nat_reflection_fwd 2>/dev/null && {
iptables -t filter -A forwarding_rule -j nat_reflection_fwd
}
}
find_networks() {
find_networks_cb() {
local cfg="$1"
local zone="$2"
local need_masq="${3:-0}"
local name
config_get name "$cfg" name
local masq
config_get_bool masq "$cfg" masq 0
[ "$name" = "$zone" ] && [ "$masq" -ge "$need_masq" ] && {
local network
config_get network "$cfg" network
echo ${network:-$zone}
return 1
}
}
config_foreach find_networks_cb zone "$@"
}
setup_fwd() {
local cfg="$1"
local reflection
config_get_bool reflection "$cfg" reflection 1
[ "$reflection" == 1 ] || return
local src
config_get src "$cfg" src
[ "$src" == "$ZONE" ] || return
local dest
config_get dest "$cfg" dest
[ "$dest" != "*" ] || return
local target
config_get target "$cfg" target DNAT
[ "$target" = DNAT ] || return
prepare_chains
local net
for net in $(find_networks "$dest" 0); do
local intnet
network_get_subnet intnet "$net" || continue
local proto
config_get proto "$cfg" proto
local epmin epmax extport
config_get extport "$cfg" src_dport "1-65535"
[ -n "$extport" ] || return
epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
[ "${epmin#!}" != "$epmax" ] || epmax=""
local ipmin ipmax intport
config_get intport "$cfg" dest_port "$extport"
ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
[ "${ipmin#!}" != "$ipmax" ] || ipmax=""
local exthost
config_get exthost "$cfg" src_dip "$extip"
local inthost
config_get inthost "$cfg" dest_ip
[ -n "$inthost" ] || return
[ "$proto" = all ] && proto="tcp udp"
[ "$proto" = tcpudp ] && proto="tcp udp"
[ "${inthost#!}" = "$inthost" ] || return 0
[ "${exthost#!}" = "$exthost" ] || return 0
[ "${epmin#!}" != "$epmin" ] && \
extport="! --dport ${epmin#!}${epmax:+:$epmax}" || \
extport="--dport $epmin${epmax:+:$epmax}"
[ "${ipmin#!}" != "$ipmin" ] && \
intport="! --dport ${ipmin#!}${ipmax:+:$ipmax}" || \
intport="--dport $ipmin${ipmax:+:$ipmax}"
local p
for p in ${proto:-tcp udp}; do
case "$p" in
tcp|udp|6|17)
iptables -t nat -A nat_reflection_in \
-s $intnet -d $exthost \
-p $p $extport \
-m comment --comment "$INTERFACE" \
-j DNAT --to $inthost:${ipmin#!}${ipmax:+-$ipmax}
iptables -t nat -A nat_reflection_out \
-s $intnet -d $inthost \
-p $p $intport \
-m comment --comment "$INTERFACE" \
-j SNAT --to-source ${intnet%%/*}
iptables -t filter -A nat_reflection_fwd \
-s $intnet -d $inthost \
-p $p $intport \
-m comment --comment "$INTERFACE" \
-j ACCEPT
;;
esac
done
done
}
config_load firewall
local is_masq_zone="$(find_networks "$ZONE" 1)"
[ -n "$is_masq_zone" ] || exit 0
local extip
network_get_ipaddr extip "$INTERFACE" || exit 0
config_foreach setup_fwd redirect
fi
|
