# 6in4.sh - IPv6-in-IPv4 tunnel backend # Copyright (c) 2010 OpenWrt.org find_6in4_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_6in4_wanip() { local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }" echo "${ip%%[^0-9.]*}" } # Hook into scan_interfaces() to synthesize a .device option # This is needed for /sbin/ifup to properly dispatch control # to setup_interface_6in4() even if no .ifname is set in # the configuration. scan_6in4() { config_set "$1" device "6in4-$1" } coldplug_interface_6in4() { setup_interface_6in4 "6in4-$1" "$1" } setup_interface_6in4() { local iface="$1" local cfg="$2" local link="6in4-$cfg" local local4=$(uci_get network "$cfg" ipaddr) local remote4 config_get remote4 "$cfg" peeraddr local local6 config_get local6 "$cfg" ip6addr local mtu config_get mtu "$cfg" mtu local ttl config_get ttl "$cfg" ttl local metric config_get metric "$cfg" metric local defaultroute config_get_bool defaultroute "$cfg" defaultroute 1 # If local4 is unset, guess local IPv4 address from the # interface used by the default route. [ -z "$local4" ] && { local wanif=$(find_6in4_wanif) [ -n "$wanif" ] && { local4=$(find_6in4_wanip "$wanif") uci_set_state network "$cfg" wan_device "$wanif" } } [ -n "$local4" ] && { # 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 ip tunnel add $link mode sit remote $remote4 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 ] && { ip -6 route add ::/0 ${metric:+metric $metric} dev $link uci_set_state network "$cfg" defaultroute 1 } env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" & } || { echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping" } } stop_interface_6in4() { local cfg="$1" local link="6in4-$cfg" local local6=$(uci_get_state network "$cfg" ip6addr) local defaultroute=$(uci_get_state network "$cfg" defaultroute) grep -qs "^ *$link:" /proc/net/dev && { env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" & [ "$defaultroute" = "1" ] && { ip -6 route del ::/0 dev $link } ip addr del $local6 dev $link ip link set $link down ip tunnel del $link } }