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odhcp6c: add workaround for broken extendprefix scenario

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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>
This commit is contained in:
Hans Dedecker 2017-09-05 14:33:01 +02:00
parent 6b06c2fb8e
commit 995193ccdb
2 changed files with 20 additions and 3 deletions
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6
package/network/ipv6/odhcp6c/Makefile
View file

@ -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

17
package/network/ipv6/odhcp6c/files/dhcpv6.script
View file

@ -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