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openwrtv3/package/network/ipv6/map/files/map.sh
Hans Dedecker e4577d2e68 map: make tunnel encapsulation limit support configurable (FS#1501) 
Be compatible with ISPs which don't support the destination option header containing
the tunnel encapsulation limit as reported in FS#1501.
Setting the uci parameter encaplimit to ignore; allows to disable the insertion
of the destination option header in the map-e packets.
Otherwise the tunnel encapsulation limit value can be set to a value from 0 till 255
by setting the encaplimit uci parameter accordingly.
If no encaplimit value is specified the default value is 4 as before.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
2018-06-04 17:07:29 +02:00

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#!/bin/sh
# map.sh - IPv4-in-IPv6 tunnel backend
#
# Author: Steven Barth <cyrus@openwrt.org>
# Copyright (c) 2014 cisco Systems, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
[ -n "$INCLUDE_ONLY" ] || {
. /lib/functions.sh
. /lib/functions/network.sh
. ../netifd-proto.sh
init_proto "$@"
}
proto_map_setup() {
local cfg="$1"
local iface="$2"
local link="map-$cfg"
# uncomment for legacy MAP0 mode
#export LEGACY=1
local type mtu ttl tunlink zone encaplimit
local rule ipaddr ip4prefixlen ip6prefix ip6prefixlen peeraddr ealen psidlen psid offset
json_get_vars type mtu ttl tunlink zone encaplimit
json_get_vars rule ipaddr ip4prefixlen ip6prefix ip6prefixlen peeraddr ealen psidlen psid offset
[ -z "$zone" ] && zone="wan"
[ -z "$type" ] && type="map-e"
[ -z "$ip4prefixlen" ] && ip4prefixlen=32
( proto_add_host_dependency "$cfg" "::" "$tunlink" )
# fixme: handle RA/DHCPv6 address race for LW
[ "$type" = lw4o6 ] && sleep 5
if [ -z "$rule" ]; then
rule="type=$type,ipv6prefix=$ip6prefix,prefix6len=$ip6prefixlen,ipv4prefix=$ipaddr,prefix4len=$ip4prefixlen"
[ -n "$psid" ] && rule="$rule,psid=$psid"
[ -n "$psidlen" ] && rule="$rule,psidlen=$psidlen"
[ -n "$offset" ] && rule="$rule,offset=$offset"
[ -n "$ealen" ] && rule="$rule,ealen=$ealen"
if [ "$type" = "map-t" ]; then
rule="$rule,dmr=$peeraddr"
else
rule="$rule,br=$peeraddr"
fi
fi
echo "rule=$rule" > /tmp/map-$cfg.rules
RULE_DATA=$(mapcalc ${tunlink:-\*} $rule)
if [ "$?" != 0 ]; then
proto_notify_error "$cfg" "INVALID_MAP_RULE"
proto_block_restart "$cfg"
return
fi
echo "$RULE_DATA" >> /tmp/map-$cfg.rules
eval $RULE_DATA
if [ -z "$RULE_BMR" ]; then
proto_notify_error "$cfg" "NO_MATCHING_PD"
proto_block_restart "$cfg"
return
fi
k=$RULE_BMR
if [ "$type" = "lw4o6" -o "$type" = "map-e" ]; then
proto_init_update "$link" 1
proto_add_ipv4_address $(eval "echo \$RULE_${k}_IPV4ADDR") "" "" ""
proto_add_tunnel
json_add_string mode ipip6
json_add_int mtu "${mtu:-1280}"
json_add_int ttl "${ttl:-64}"
json_add_string local $(eval "echo \$RULE_${k}_IPV6ADDR")
json_add_string remote $(eval "echo \$RULE_${k}_BR")
json_add_string link $(eval "echo \$RULE_${k}_PD6IFACE")
json_add_object "data"
json_add_string encaplimit "${encaplimit:-4}"
if [ "$type" = "map-e" ]; then
json_add_array "fmrs"
for i in $(seq $RULE_COUNT); do
[ "$(eval "echo \$RULE_${i}_FMR")" != 1 ] && continue
json_add_object ""
json_add_string prefix6 "$(eval "echo \$RULE_${i}_IPV6PREFIX")/$(eval "echo \$RULE_${i}_PREFIX6LEN")"
json_add_string prefix4 "$(eval "echo \$RULE_${i}_IPV4PREFIX")/$(eval "echo \$RULE_${i}_PREFIX4LEN")"
json_add_int ealen $(eval "echo \$RULE_${i}_EALEN")
json_add_int offset $(eval "echo \$RULE_${i}_OFFSET")
json_close_object
done
json_close_array
fi
json_close_object
proto_close_tunnel
elif [ "$type" = "map-t" -a -f "/proc/net/nat46/control" ]; then
proto_init_update "$link" 1
local style="MAP"
[ "$LEGACY" = 1 ] && style="MAP0"
echo add $link > /proc/net/nat46/control
local cfgstr="local.style $style local.v4 $(eval "echo \$RULE_${k}_IPV4PREFIX")/$(eval "echo \$RULE_${k}_PREFIX4LEN")"
cfgstr="$cfgstr local.v6 $(eval "echo \$RULE_${k}_IPV6PREFIX")/$(eval "echo \$RULE_${k}_PREFIX6LEN")"
cfgstr="$cfgstr local.ea-len $(eval "echo \$RULE_${k}_EALEN") local.psid-offset $(eval "echo \$RULE_${k}_OFFSET")"
cfgstr="$cfgstr remote.v4 0.0.0.0/0 remote.v6 $(eval "echo \$RULE_${k}_DMR") remote.style RFC6052 remote.ea-len 0 remote.psid-offset 0"
echo config $link $cfgstr > /proc/net/nat46/control
for i in $(seq $RULE_COUNT); do
[ "$(eval "echo \$RULE_${i}_FMR")" != 1 ] && continue
local cfgstr="remote.style $style remote.v4 $(eval "echo \$RULE_${i}_IPV4PREFIX")/$(eval "echo \$RULE_${i}_PREFIX4LEN")"
cfgstr="$cfgstr remote.v6 $(eval "echo \$RULE_${i}_IPV6PREFIX")/$(eval "echo \$RULE_${i}_PREFIX6LEN")"
cfgstr="$cfgstr remote.ea-len $(eval "echo \$RULE_${i}_EALEN") remote.psid-offset $(eval "echo \$RULE_${i}_OFFSET")"
echo insert $link $cfgstr > /proc/net/nat46/control
done
else
proto_notify_error "$cfg" "UNSUPPORTED_TYPE"
proto_block_restart "$cfg"
fi
proto_add_ipv4_route "0.0.0.0" 0
proto_add_data
[ "$zone" != "-" ] && json_add_string zone "$zone"
json_add_array firewall
if [ -z "$(eval "echo \$RULE_${k}_PORTSETS")" ]; then
json_add_object ""
json_add_string type nat
json_add_string target SNAT
json_add_string family inet
json_add_string snat_ip $(eval "echo \$RULE_${k}_IPV4ADDR")
json_close_object
else
for portset in $(eval "echo \$RULE_${k}_PORTSETS"); do
for proto in icmp tcp udp; do
json_add_object ""
json_add_string type nat
json_add_string target SNAT
json_add_string family inet
json_add_string proto "$proto"
json_add_boolean connlimit_ports 1
json_add_string snat_ip $(eval "echo \$RULE_${k}_IPV4ADDR")
json_add_string snat_port "$portset"
json_close_object
done
done
fi
if [ "$type" = "map-t" ]; then
json_add_object ""
json_add_string type rule
json_add_string family inet6
json_add_string proto all
json_add_string direction in
json_add_string dest "$zone"
json_add_string src "$zone"
json_add_string src_ip $(eval "echo \$RULE_${k}_IPV6ADDR")
json_add_string target ACCEPT
json_close_object
json_add_object ""
json_add_string type rule
json_add_string family inet6
json_add_string proto all
json_add_string direction out
json_add_string dest "$zone"
json_add_string src "$zone"
json_add_string dest_ip $(eval "echo \$RULE_${k}_IPV6ADDR")
json_add_string target ACCEPT
json_close_object
proto_add_ipv6_route $(eval "echo \$RULE_${k}_IPV6ADDR") 128
fi
json_close_array
proto_close_data
proto_send_update "$cfg"
if [ "$type" = "lw4o6" -o "$type" = "map-e" ]; then
json_init
json_add_string name "${cfg}_"
json_add_string ifname "@$(eval "echo \$RULE_${k}_PD6IFACE")"
json_add_string proto "static"
json_add_array ip6addr
json_add_string "" "$(eval "echo \$RULE_${k}_IPV6ADDR")"
json_close_array
json_close_object
ubus call network add_dynamic "$(json_dump)"
fi
}
proto_map_teardown() {
local cfg="$1"
local link="map-$cfg"
json_get_var type type
[ -z "$type" ] && type="map-e"
case "$type" in
"map-e"|"lw4o6") ifdown "${cfg}_" ;;
"map-t") [ -f "/proc/net/nat46/control" ] && echo del $link > /proc/net/nat46/control ;;
esac
rm -f /tmp/map-$cfg.rules
}
proto_map_init_config() {
no_device=1
available=1
proto_config_add_string "rule"
proto_config_add_string "ipaddr"
proto_config_add_int "ip4prefixlen"
proto_config_add_string "ip6prefix"
proto_config_add_int "ip6prefixlen"
proto_config_add_string "peeraddr"
proto_config_add_int "ealen"
proto_config_add_int "psidlen"
proto_config_add_int "psid"
proto_config_add_int "offset"
proto_config_add_string "tunlink"
proto_config_add_int "mtu"
proto_config_add_int "ttl"
proto_config_add_string "zone"
proto_config_add_string "encaplimit"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol map
}
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