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102 lines
2.5 KiB
Bash
Executable File
102 lines
2.5 KiB
Bash
Executable File
# 6in4.sh - IPv6-in-IPv4 tunnel backend
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# Copyright (c) 2010 OpenWrt.org
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find_6in4_wanif() {
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local if=$(ip -4 r l e 0/0); if="${if#default* dev }"; if="${if%% *}"
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[ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
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}
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find_6in4_wanip() {
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local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
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echo "${ip%%[^0-9.]*}"
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}
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# Hook into scan_interfaces() to synthesize a .device option
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# This is needed for /sbin/ifup to properly dispatch control
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# to setup_interface_6in4() even if no .ifname is set in
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# the configuration.
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scan_6in4() {
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config_set "$1" device "6in4-$1"
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}
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coldplug_interface_6in4() {
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setup_interface_6in4 "6in4-$1" "$1"
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}
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setup_interface_6in4() {
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local iface="$1"
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local cfg="$2"
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local link="6in4-$cfg"
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local local4=$(uci_get network "$cfg" ipaddr)
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local remote4
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config_get remote4 "$cfg" peeraddr
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local local6
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config_get local6 "$cfg" ip6addr
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local mtu
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config_get mtu "$cfg" mtu
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local ttl
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config_get ttl "$cfg" ttl
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local defaultroute
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config_get_bool defaultroute "$cfg" defaultroute 1
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# If local4 is unset, guess local IPv4 address from the
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# interface used by the default route.
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[ -z "$local4" ] && {
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local wanif=$(find_6in4_wanif)
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[ -n "$wanif" ] && {
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local4=$(find_6in4_wanip "$wanif")
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uci_set_state network "$cfg" wan_device "$wanif"
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}
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}
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[ -n "$local4" ] && {
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# creating the tunnel below will trigger a net subsystem event
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# prevent it from touching or iface by disabling .auto here
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uci_set_state network "$cfg" ifname $link
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uci_set_state network "$cfg" auto 0
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ip tunnel add $link mode sit remote $remote4 local $local4 ttl ${ttl:-64}
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ip link set $link up
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ip link set mtu ${mtu:-1280} dev $link
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ip addr add $local6 dev $link
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uci_set_state network "$cfg" ipaddr $local4
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uci_set_state network "$cfg" ip6addr $local6
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[ "$defaultroute" = 1 ] && {
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ip -6 route add ::/0 dev $link
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uci_set_state network "$cfg" defaultroute 1
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}
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env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
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} || {
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echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
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}
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}
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stop_interface_6in4() {
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local cfg="$1"
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local link="6in4-$cfg"
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local local6=$(uci_get_state network "$cfg" ip6addr)
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local defaultroute=$(uci_get_state network "$cfg" defaultroute)
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grep -qs "^ *$link:" /proc/net/dev && {
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env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
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[ "$defaultroute" = "1" ] && {
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ip -6 route del ::/0 dev $link
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}
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ip addr del $local6 dev $link
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ip link set $link down
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ip tunnel del $link
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}
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}
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