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Diffstat (limited to 'package/6to4/files/6to4.sh')
| -rwxr-xr-x | package/6to4/files/6to4.sh | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/package/6to4/files/6to4.sh b/package/6to4/files/6to4.sh new file mode 100755 index 000000000..4db924d4e --- /dev/null +++ b/package/6to4/files/6to4.sh @@ -0,0 +1,190 @@ +# 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 remote4 + config_get remote4 "$cfg" peeraddr + + local mtu + config_get mtu "$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 + delete radvd.iface_$sid + delete radvd.prefix_$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_$cfg" + + uci -q batch <<-EOF + delete radvd.iface_$sid + delete 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" + } +} |