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