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From a48ea27debb926a30810c9f1a42f096494c727e2 Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Mon, 29 Feb 2016 14:52:16 +0100
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Subject: [PATCH] network/dhclient-script.sh: add classless-static-routes
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support
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https://bugzilla.redhat.com/show_bug.cgi?id=1260955
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---
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modules.d/40network/dhclient-script.sh | 48 ++++++++++++++++++++++++++++++++++
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modules.d/40network/dhclient.conf | 5 +++-
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2 files changed, 52 insertions(+), 1 deletion(-)
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diff --git a/modules.d/40network/dhclient-script.sh b/modules.d/40network/dhclient-script.sh
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index 6d4b9dd..9553858 100755
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--- a/modules.d/40network/dhclient-script.sh
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+++ b/modules.d/40network/dhclient-script.sh
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@@ -95,6 +95,51 @@ setup_interface6() {
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[ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
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}
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+function parse_option_121() {
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+ while [ $# -ne 0 ]; do
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+ mask="$1"
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+ shift
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+
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+ # Is the destination a multicast group?
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+ if [ $1 -ge 224 -a $1 -lt 240 ]; then
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+ multicast=1
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+ else
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+ multicast=0
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+ fi
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+
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+ # Parse the arguments into a CIDR net/mask string
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+ if [ $mask -gt 24 ]; then
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+ destination="$1.$2.$3.$4/$mask"
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+ shift; shift; shift; shift
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+ elif [ $mask -gt 16 ]; then
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+ destination="$1.$2.$3.0/$mask"
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+ shift; shift; shift
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+ elif [ $mask -gt 8 ]; then
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+ destination="$1.$2.0.0/$mask"
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+ shift; shift
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+ else
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+ destination="$1.0.0.0/$mask"
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+ shift
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+ fi
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+
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+ # Read the gateway
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+ gateway="$1.$2.$3.$4"
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+ shift; shift; shift; shift
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+
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+ # Multicast routing on Linux
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+ # - If you set a next-hop address for a multicast group, this breaks with Cisco switches
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+ # - If you simply leave it link-local and attach it to an interface, it works fine.
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+ if [ $multicast -eq 1 ]; then
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+ temp_result="$destination dev $interface"
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+ else
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+ temp_result="$destination via $gateway dev $interface"
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+ fi
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+
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+ echo "/sbin/ip route add $temp_result"
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+ done
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+}
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+
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+
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case $reason in
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PREINIT)
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echo "dhcp: PREINIT $netif up"
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@@ -129,6 +174,9 @@ case $reason in
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{
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echo '. /lib/net-lib.sh'
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echo "setup_net $netif"
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+ if [ -n "$new_classless_static_routes" ]; then
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+ modify_routes add "$(parse_option_121 $new_classless_static_routes)"
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+ fi
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echo "source_hook initqueue/online $netif"
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[ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif"
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echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
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diff --git a/modules.d/40network/dhclient.conf b/modules.d/40network/dhclient.conf
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index dbf5882..7b06763 100644
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--- a/modules.d/40network/dhclient.conf
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+++ b/modules.d/40network/dhclient.conf
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@@ -1,3 +1,6 @@
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+
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+option classless-routes code 121 = array of unsigned integer 8;
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+
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request subnet-mask, broadcast-address, time-offset, routers,
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domain-name, domain-name-servers, domain-search, host-name,
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- root-path, interface-mtu;
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+ root-path, interface-mtu classless-routes;
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