odhcp6c: add route-workaround for broken IPv6-ISPs

Some ISP seem to only do stateful DHCPv6 and not sending RAs.
This is technically broken because plain DHCPv6 doesn't carry routes.

We work around here by faking a default route to the DHCPv6 server
if we do not receive a useful RA from the ISP.

This workaround can be turned off with: option fakeroutes 0

Signed-off-by: Steven Barth <steven@midlink.org>

SVN-Revision: 42803

package/network/ipv6/odhcp6c/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2012 OpenWrt.org
+# Copyright (C) 2012-2014 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=odhcp6c
-PKG_VERSION:=2014-09-27
+PKG_VERSION:=2014-10-06
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE_URL:=git://github.com/sbyx/odhcp6c.git
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_VERSION:=3e52a1448eee0fbf7ff67c123265bedcbc9c26d0
+PKG_SOURCE_VERSION:=d6fe99f6d03873e7a670c9b6f26fa03b219422f5
 PKG_MAINTAINER:=Steven Barth <steven@midlink.org>
 
 include $(INCLUDE_DIR)/package.mk

package/network/ipv6/odhcp6c/files/dhcpv6.script

@@ -26,6 +26,15 @@ setup_interface () {
 
 	for prefix in $PREFIXES; do
 		proto_add_ipv6_prefix "$prefix"
+                local entry="${prefix#*/}"
+                entry="${entry#*,}"
+                entry="${entry#*,}"
+                local valid="${entry%%,*}"
+
+		if [ -z "$RA_ADDRESSES" -a -z "$RA_ROUTES" -a \
+				-z "$RA_DNS" -a "$FAKE_ROUTES" = 1 ]; then
+			RA_ROUTES="::/0,$SERVER,$valid,4096"
+		fi
 	done
 
 	[ -n "$USERPREFIX" ] && proto_add_ipv6_prefix "$USERPREFIX"
@@ -51,6 +60,11 @@ setup_interface () {
 		local valid="${entry%%,*}"
 
 		proto_add_ipv6_address "$addr" "$mask" "$preferred" "$valid" 1
+
+                if [ -z "$RA_ADDRESSES" -a -z "$RA_ROUTES" -a \
+                                -z "$RA_DNS" -a "$FAKE_ROUTES" = 1 ]; then
+                        RA_ROUTES="::/0,$SERVER,$valid,4096"
+                fi
 	done
 
 	for entry in $RA_ROUTES; do

package/network/ipv6/odhcp6c/files/dhcpv6.sh

@@ -26,14 +26,15 @@ proto_dhcpv6_init_config() {
 	proto_config_add_string "vendorclass"
 	proto_config_add_boolean delegate
 	proto_config_add_int "soltimeout"
+	proto_config_add_boolean fakeroutes
 }
 
 proto_dhcpv6_setup() {
 	local config="$1"
 	local iface="$2"
 
-	local reqaddress reqprefix clientid reqopts noslaaconly forceprefix norelease ip6prefix iface_dslite iface_map ifaceid sourcerouting userclass vendorclass delegate zone_dslite zone_map zone soltimeout
-	json_get_vars reqaddress reqprefix clientid reqopts noslaaconly forceprefix norelease ip6prefix iface_dslite iface_map ifaceid sourcerouting userclass vendorclass delegate zone_dslite zone_map zone soltimeout
+	local reqaddress reqprefix clientid reqopts noslaaconly forceprefix norelease ip6prefix iface_dslite iface_map ifaceid sourcerouting userclass vendorclass delegate zone_dslite zone_map zone soltimeout fakeroutes
+	json_get_vars reqaddress reqprefix clientid reqopts noslaaconly forceprefix norelease ip6prefix iface_dslite iface_map ifaceid sourcerouting userclass vendorclass delegate zone_dslite zone_map zone soltimeout fakeroutes
 
 
 	# Configure
@@ -72,6 +73,7 @@ proto_dhcpv6_setup() {
 	[ -n "$zone_dslite" ] && proto_export "ZONE_DSLITE=$zone_dslite"
 	[ -n "$zone_map" ] && proto_export "ZONE_MAP=$zone_map"
 	[ -n "$zone" ] && proto_export "ZONE=$zone"
+	[ "$fakeroutes" != "0" ] && proto_export "FAKE_ROUTES=1"
 
 	proto_export "INTERFACE=$config"
 	proto_run_command "$config" odhcp6c \