# 6to4.sh - IPv6-in-IPv4 tunnel backend # Copyright (c) 2010 OpenWrt.org find_6to4_wanif() { local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}" [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if" } find_6to4_wanip() { local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }" echo "${ip%%[^0-9.]*}" } find_6to4_prefix() { local ip4="$1" local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS" printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4 } # Hook into scan_interfaces() to synthesize a .device option # This is needed for /sbin/ifup to properly dispatch control # to setup_interface_6to4() even if no .ifname is set in # the configuration. scan_6to4() { config_set "$1" device "6to4-$1" } coldplug_interface_6to4() { setup_interface_6to4 "6to4-$1" "$1" } setup_interface_6to4() { local iface="$1" local cfg="$2" local link="6to4-$cfg" local local4=$(uci_get network "$cfg" ipaddr) local mtu config_get mtu "$cfg" mtu local ttl config_get ttl "$cfg" ttl local defaultroute config_get_bool defaultroute "$cfg" defaultroute 1 local wanif=$(find_6to4_wanif) [ -z "$wanif" ] && { logger -t "$link" "Cannot find wan interface - aborting" return } local wancfg=$(find_config "$wanif") [ -z "$wancfg" ] && { logger -t "$link" "Cannot find wan network - aborting" return } # If local4 is unset, guess local IPv4 address from the # interface used by the default route. [ -z "$local4" ] && { [ -n "$wanif" ] && { local4=$(find_6to4_wanip "$wanif") uci_set_state network "$cfg" wan_device "$wanif" } } [ -n "$local4" ] && { logger -t "$link" "Starting ..." # creating the tunnel below will trigger a net subsystem event # prevent it from touching or iface by disabling .auto here uci_set_state network "$cfg" ifname $link uci_set_state network "$cfg" auto 0 # find our local prefix local prefix6=$(find_6to4_prefix "$local4") local local6="$prefix6::1/16" logger -t "$link" " * IPv4 address is $local4" logger -t "$link" " * IPv6 address is $local6" ip tunnel add $link mode sit remote any local $local4 ttl ${ttl:-64} ip link set $link up ip link set mtu ${mtu:-1280} dev $link ip addr add $local6 dev $link uci_set_state network "$cfg" ipaddr $local4 uci_set_state network "$cfg" ip6addr $local6 [ "$defaultroute" = 1 ] && { logger -t "$link" " * Adding default route" ip -6 route add 2000::/3 via ::192.88.99.1 dev $link metric 1 uci_set_state network "$cfg" defaultroute 1 } # find delegation target local adv_interface config_get adv_interface "$cfg" adv_interface local adv_ifname config_get adv_ifname "${adv_interface:-lan}" ifname local adv_subnet=$(uci_get network "$cfg" adv_subnet) grep -qs "^ *$adv_ifname:" /proc/net/dev && { local subnet6="$prefix6:${adv_subnet:-1}::1/64" logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)" ip -6 addr add $subnet6 dev $adv_ifname uci_set_state network "$cfg" adv_subnet "$subnet6" uci_set_state network "$cfg" adv_ifname "$adv_ifname" [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && { local sid="6to4_$cfg" uci -q batch <<-EOF revert radvd.iface_$sid revert radvd.prefix_$sid set radvd.iface_$sid=interface set radvd.iface_$sid.ignore=0 set radvd.iface_$sid.interface=${adv_interface:-lan} set radvd.iface_$sid.IgnoreIfMissing=1 set radvd.iface_$sid.AdvSendAdvert=1 set radvd.iface_$sid.MaxRtrAdvInterval=30 set radvd.prefix_$sid=prefix set radvd.prefix_$sid.ignore=0 set radvd.prefix_$sid.interface=${adv_interface:-lan} set radvd.prefix_$sid.prefix=0:0:0:${adv_subnet:-1}::/64 set radvd.prefix_$sid.AdvOnLink=1 set radvd.prefix_$sid.AdvAutonomous=1 set radvd.prefix_$sid.AdvValidLifetime=300 set radvd.prefix_$sid.AdvPreferredLifetime=120 set radvd.prefix_$sid.Base6to4Interface=$wancfg EOF /etc/init.d/radvd restart } } logger -t "$link" "... started" env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" & } || { echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping" } } stop_interface_6to4() { local cfg="$1" local link="6to4-$cfg" local local6=$(uci_get_state network "$cfg" ip6addr) local defaultroute=$(uci_get_state network "$cfg" defaultroute) local adv_subnet=$(uci_get_state network "$cfg" adv_subnet) local adv_ifname=$(uci_get_state network "$cfg" adv_ifname) grep -qs "^ *$link:" /proc/net/dev && { logger -t "$link" "Shutting down ..." env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" & [ -n "$adv_subnet" ] && [ -n "$adv_ifname" ] && { local sid="6to4_$cfg" uci -q batch <<-EOF revert radvd.iface_$sid revert radvd.prefix_$sid EOF /etc/init.d/radvd enabled && /etc/init.d/radvd restart ip -6 addr del $adv_subnet dev $adv_ifname } [ "$defaultroute" = "1" ] && { ip -6 route del 2000::/3 via ::192.88.99.1 dev $link metric 1 } ip addr del $local6 dev $link ip link set $link down ip tunnel del $link logger -t "$link" "... stopped" } }