114 lines
3.5 KiB
Bash
114 lines
3.5 KiB
Bash
# Copyright (C) 2009-2010 OpenWrt.org
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fw_config_get_redirect() {
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[ "${redirect_NAME}" != "$1" ] || return
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fw_config_get_section "$1" redirect { \
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string _name "$1" \
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string name "" \
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string src "" \
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ipaddr src_ip "" \
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ipaddr src_dip "" \
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string src_mac "" \
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string src_port "" \
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string src_dport "" \
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string dest "" \
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ipaddr dest_ip "" \
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string dest_mac "" \
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string dest_port "" \
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string proto "tcpudp" \
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string family "" \
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string target "DNAT" \
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} || return
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[ -n "$redirect_name" ] || redirect_name=$redirect__name
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}
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fw_load_redirect() {
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fw_config_get_redirect "$1"
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fw_callback pre redirect
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local fwdchain natchain natopt nataddr natports srcdaddr srcdports
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if [ "$redirect_target" == "DNAT" ]; then
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[ -n "$redirect_src" -a -n "$redirect_dest_ip$redirect_dest_port" ] || {
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fw_log error "DNAT redirect ${redirect_name}: needs src and dest_ip or dest_port, skipping"
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return 0
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}
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fwdchain="zone_${redirect_src}${redirect_dest_ip:+_forward}"
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natopt="--to-destination"
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natchain="zone_${redirect_src}_prerouting"
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nataddr="$redirect_dest_ip"
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fw_get_port_range natports "$redirect_dest_port" "-"
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fw_get_negation srcdaddr '-d' "${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
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fw_get_port_range srcdports "$redirect_src_dport" ":"
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list_contains FW_CONNTRACK_ZONES $redirect_src || \
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append FW_CONNTRACK_ZONES $redirect_src
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elif [ "$redirect_target" == "SNAT" ]; then
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[ -n "$redirect_dest" -a -n "$redirect_src_dip" ] || {
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fw_log error "SNAT redirect ${redirect_name}: needs dest and src_dip, skipping"
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return 0
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}
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fwdchain="${redirect_src:+zone_${redirect_src}_forward}"
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natopt="--to-source"
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natchain="zone_${redirect_dest}_nat"
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nataddr="$redirect_src_dip"
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fw_get_port_range natports "$redirect_src_dport" "-"
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fw_get_negation srcdaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
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fw_get_port_range srcdports "$redirect_dest_port" ":"
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list_contains FW_CONNTRACK_ZONES $redirect_dest || \
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append FW_CONNTRACK_ZONES $redirect_dest
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else
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fw_log error "redirect ${redirect_name}: target must be either DNAT or SNAT, skipping"
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return 0
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fi
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local mode
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fw_get_family_mode mode ${redirect_family:-x} ${redirect_src:-$redirect_dest} I
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local srcaddr
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fw_get_negation srcaddr '-s' "${redirect_src_ip:+$redirect_src_ip/$redirect_src_ip_prefixlen}"
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local srcports
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fw_get_port_range srcports "$redirect_src_port" ":"
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local destaddr
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fw_get_negation destaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
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local destports
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fw_get_port_range destports "${redirect_dest_port:-$redirect_src_dport}" ":"
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[ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
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for redirect_proto in $redirect_proto; do
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local pos
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eval 'pos=$((++FW__REDIR_COUNT_'${mode#G}'_'$natchain'))'
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fw add $mode n $natchain $redirect_target $pos { $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr $srcdaddr \
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${redirect_proto:+-p $redirect_proto} \
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${srcports:+--sport $srcports} \
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${srcdports:+--dport $srcdports} \
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${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
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$natopt $nataddr${natports:+:$natports} \
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}
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fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr ${destaddr:--m conntrack --ctstate DNAT} \
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${redirect_proto:+-p $redirect_proto} \
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${srcports:+--sport $srcports} \
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${destports:+--dport $destports} \
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${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
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}
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done
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fw_callback post redirect
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}
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