6to4: add netifd support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30949 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 273 insertions, 0 deletions

diff --git a/package/6to4/files.old/6to4.sh b/package/6to4/files.old/6to4.sh
new file mode 100755
index 000000000..f7f48e5ba
--- /dev/null
+++ b/package/6to4/files.old/6to4.sh
@@ -0,0 +1,273 @@
+# 6to4.sh - IPv6-in-IPv4 tunnel backend
+# Copyright (c) 2010-2011 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 $4
+}
+
+test_6to4_rfc1918()
+{
+	local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
+	[ $1 -eq  10 ] && return 0
+	[ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
+	[ $1 -eq 172 ] && [ $2 -ge  16 ] && [ $2 -le  31 ] && return 0
+	return 1
+}
+
+set_6to4_radvd_interface() {
+	local cfgid="$1"
+	local lanif="${2:-lan}"
+	local ifmtu="${3:-1280}"
+	local ifsection=""
+
+	find_ifsection() {
+		local net
+		local cfg="$1"
+		config_get net "$cfg" interface
+
+		[ "$net" = "$lanif" ] && {
+			ifsection="$cfg"
+			return 1
+		}
+	}
+
+	config_foreach find_ifsection interface
+
+	[ -z "$ifsection" ] && {
+		ifsection="iface_$sid"
+		uci_set_state radvd "$ifsection" "" interface
+		uci_set_state radvd "$ifsection" interface "$lanif"
+	}
+
+	uci_set_state radvd "$ifsection" ignore            0
+	uci_set_state radvd "$ifsection" IgnoreIfMissing   1
+	uci_set_state radvd "$ifsection" AdvSendAdvert     1
+	uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
+	uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
+}
+
+set_6to4_radvd_prefix() {
+	local cfgid="$1"
+	local lanif="${2:-lan}"
+	local wanif="${3:-wan}"
+	local prefix="${4:-0:0:0:1::/64}"
+	local vlt="${5:-300}"
+	local plt="${6:-120}"
+	local pfxsection=""
+
+	find_pfxsection() {
+		local net base
+		local cfg="$1"
+		config_get net  "$cfg" interface
+		config_get base "$cfg" Base6to4Interface
+
+		[ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
+			pfxsection="$cfg"
+			return 1
+		}
+	}
+
+	config_foreach find_pfxsection prefix
+
+	[ -z "$pfxsection" ] && {
+		pfxsection="prefix_${sid}_${lanif}"
+		uci_set_state radvd "$pfxsection" ""                   prefix
+		uci_set_state radvd "$pfxsection" ignore               0
+		uci_set_state radvd "$pfxsection" interface            "$lanif"
+		uci_set_state radvd "$pfxsection" prefix               "$prefix"
+		uci_set_state radvd "$pfxsection" AdvOnLink            1
+		uci_set_state radvd "$pfxsection" AdvAutonomous        1
+		uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
+		uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
+		uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
+	}
+}
+
+
+# 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 metric
+	config_get metric "$cfg" metric
+
+	local defaultroute
+	config_get_bool defaultroute "$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 "$wanif"
+		}
+	}
+
+	test_6to4_rfc1918 "$local4" && {
+		logger -t "$link" "Local wan ip $local4 is private - aborting"
+		return
+	}
+
+	[ -n "$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 ::/0 via ::192.88.99.1 metric ${metric:-1} dev $link
+			uci_set_state network "$cfg" defaultroute 1
+		}
+
+		[ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
+			local sid="6to4_$cfg"
+
+			uci_revert_state radvd
+			config_load radvd
+
+			# find delegation target
+			local adv_interface
+			config_get adv_interface "$cfg" adv_interface
+
+			local adv_subnet=$(uci_get network "$cfg" adv_subnet)
+			      adv_subnet=$((0x${adv_subnet:-1}))
+
+			local adv_subnets=""
+
+			for adv_interface in ${adv_interface:-lan}; do
+				local adv_ifname
+				config_get adv_ifname "${adv_interface:-lan}" ifname
+
+				grep -qs "^ *$adv_ifname:" /proc/net/dev && {
+					local adv_valid_lifetime adv_preferred_lifetime
+					config_get adv_valid_lifetime     "$cfg" adv_valid_lifetime
+					config_get adv_preferred_lifetime "$cfg" adv_preferred_lifetime
+
+					local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
+
+					logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
+					ip -6 addr add $subnet6 dev $adv_ifname
+
+					set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
+					set_6to4_radvd_prefix    "$sid" "$adv_interface" \
+						"$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
+						"$adv_valid_lifetime" "$adv_preferred_lifetime"
+
+					adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
+					adv_subnet=$(($adv_subnet + 1))
+				}
+			done
+
+			uci_set_state network "$cfg" adv_subnets "$adv_subnets"
+
+			/etc/init.d/radvd restart
+		}
+
+		logger -t "$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_subnets=$(uci_get_state network "$cfg" adv_subnets)
+
+	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_subnets" ] && {
+			uci_revert_state radvd
+			/etc/init.d/radvd enabled && /etc/init.d/radvd restart
+
+			local adv_subnet
+			for adv_subnet in $adv_subnets; do
+				local ifname="${adv_subnet%%:*}"
+				local subnet="${adv_subnet#*:}"
+
+				logger -t "$link" " * Removing IPv6 subnet $subnet from interface $ifname"
+				ip -6 addr del $subnet dev $ifname
+			done
+		}
+
+		[ "$defaultroute" = "1" ] && \
+			ip -6 route del ::/0 via ::192.88.99.1 dev $link
+
+		ip addr del $local6 dev $link
+		ip link set $link down
+		ip tunnel del $link
+
+		logger -t "$link" "... stopped"
+	}
+}