From 995193ccdb2adb2bfe226965589b5f3db71bdd80 Mon Sep 17 00:00:00 2001
From: Hans Dedecker <dedeckeh@gmail.com>
Date: Tue, 5 Sep 2017 14:33:01 +0200
Subject: [PATCH] odhcp6c: add workaround for broken extendprefix scenario

Extendprefix is typically used to extend an IPv6 RA prefix from a mobile
wan link to the LAN; such scenario requires correct RA prefix settings
like the on link flag not being set.
However some mobile manufacter set the RA prefix on link flag which breaks
basic IPv6 routing.
Work around this issue by filtering out the route being equal to the
extended prefix.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---
 package/network/ipv6/odhcp6c/Makefile           |  6 +++---
 .../network/ipv6/odhcp6c/files/dhcpv6.script    | 17 +++++++++++++++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/package/network/ipv6/odhcp6c/Makefile b/package/network/ipv6/odhcp6c/Makefile
index a95a380e0d..457a871efb 100644
--- a/package/network/ipv6/odhcp6c/Makefile
+++ b/package/network/ipv6/odhcp6c/Makefile
@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=odhcp6c
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/odhcp6c.git
-PKG_SOURCE_DATE:=2017-09-02
+PKG_SOURCE_DATE:=2017-09-05
 PKG_SOURCE_VERSION:=51733a6d3bfe0fb9e8c53aea22231e5b8a1f64c3
-PKG_MIRROR_HASH:=7ab8d3755c588b493792110d871c682cdd8e944ae21db64177321c464c104fb3
+PKG_MIRROR_HASH:=fdccfb9a6cb00d6dbf1a3160bd36622ee8e188a9d58bcd282c71a9368972e184
 PKG_MAINTAINER:=Hans Dedecker <dedeckeh@gmail.com>
 PKG_LICENSE:=GPL-2.0
 
diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.script b/package/network/ipv6/odhcp6c/files/dhcpv6.script
index ab0b556755..03efaf7211 100755
--- a/package/network/ipv6/odhcp6c/files/dhcpv6.script
+++ b/package/network/ipv6/odhcp6c/files/dhcpv6.script
@@ -81,6 +81,23 @@ setup_interface () {
 		# RFC 7278
 		if [ "$mask" -eq 64 -a -z "$PREFIXES" -a -n "$EXTENDPREFIX" ]; then
 			proto_add_ipv6_prefix "$addr/$mask,$preferred,$valid"
+
+			local raroutes=""
+			for route in $RA_ROUTES; do
+				local prefix="${route%%/*}"
+				local entry="${route#*/}"
+				local pmask="${entry%%,*}"
+				entry="${entry#*,}"
+				local gw="${entry%%,*}"
+
+				[ -z "$gw" -a "$mask" = "$pmask" ] && {
+					case "$addr" in
+						"${prefix%*::}"*) continue;;
+					esac
+				}
+				raroutes="$raroutes $route"
+			done
+			RA_ROUTES="$raroutes"
 		fi
 	done