diff --git a/Makefile b/Makefile index c7113be..cc48953 100644 --- a/Makefile +++ b/Makefile @@ -108,6 +108,7 @@ EXECUTOR_SCRIPTS_OPT ?= \ bridge \ ethtool \ gre \ + mpls \ tunnel \ vrf \ vxlan \ diff --git a/doc/interfaces-mpls.scd b/doc/interfaces-mpls.scd new file mode 100644 index 0000000..5f54e02 --- /dev/null +++ b/doc/interfaces-mpls.scd @@ -0,0 +1,40 @@ +interfaces-mpls(5) + +# NAME + +*interfaces-mpls* - MPLS vocabulary for the interfaces(5) file format + +# DESCRIPTION + +Linux allows has support for MultiProtocol Label Switching (MPLS) for a while +now. The following options allow for this configuration. + +# MPLS-RELATED OPTIONS + +The MPLS executor will only modify the sysctl configuration if these options +are provided, otherwise other mechanisms such as /etc/sysctl.conf may be used. +If MPLS is enabled on (at least) one interface the executor will load the +_mpls_iptunnel_ kernel module. + +Be aware that you have to set the _platform_labels_ sysctl to make MPLS work. +See https://www.kernel.org/doc/Documentation/networking/mpls-sysctl.rst for +more details on the MPLS related knobs in the Linux kernel. + + +*mpls-enable* _yes|no_ + Control whether packets can be input on this interface. If disabled, + packets carrying an MPLS label will be discarded without further + processing. + +# EXAMPLES + +``` +iface eth0 + address 2001:db8:08:15::42/64 + # + mpls-enable yes +``` + +# AUTHORS + +Maximilian Wilhelm diff --git a/doc/interfaces.scd b/doc/interfaces.scd index 1aa15d6..24c3365 100644 --- a/doc/interfaces.scd +++ b/doc/interfaces.scd @@ -239,9 +239,12 @@ iface eth0 *interfaces-batman*(5) *interfaces-bond*(5) *interfaces-bridge*(5) +*interfaces-forward*(5) +*interfaces-mpls*(5) *interfaces-ppp*(5) *interfaces-vrf*(5) *interfaces-vxlan*(5) +*interfaces-wifi*(5) *interfaces-wireguard*(5) # AUTHORS diff --git a/executor-scripts/linux/mpls b/executor-scripts/linux/mpls new file mode 100755 index 0000000..97d42c9 --- /dev/null +++ b/executor-scripts/linux/mpls @@ -0,0 +1,36 @@ +#!/bin/sh +# +# Maximilian Wilhelm +# -- Thu, 17 Dec 2020 03:02:10 +0100 +# +# This executor is responsible for setting up MPLS decapsulation on a given interface. +# +# See interfaces-mpls(5) for a list of supported options. +# + +yesno() { + case "$1" in + yes|1) echo 1 ;; + *) echo 0 ;; + esac +} + +[ -z "$VERBOSE" ] || set -x + +# We only operate in pre-up phase +[ "$PHASE" != "pre-up" ] && exit 0 + + +if [ "$IF_MPLS_ENABLE" ]; then + value=$(yesno $IF_MPLS_ENABLE) + + # Load mpls module if we should enable MPLS decap on (at least) one interface + if [ "${value}" = 1 ]; then + ${MOCK} modprobe mpls_iptunnel + fi + + # If MPLS support isn't loaded and we are not MOCKing, carry on + if [ -f "/proc/sys/net/mpls/conf/$IFACE/input" -o "${MOCK}" ]; then + ${MOCK} /bin/sh -c "echo ${value} > /proc/sys/net/mpls/conf/$IFACE/input" + fi +fi diff --git a/tests/linux/Kyuafile b/tests/linux/Kyuafile index ef000f7..2e668b8 100644 --- a/tests/linux/Kyuafile +++ b/tests/linux/Kyuafile @@ -9,6 +9,7 @@ atf_test_program{name='forward_test'} atf_test_program{name='gre_test'} atf_test_program{name='ipv6-ra_test'} atf_test_program{name='link_test'} +atf_test_program{name='mpls_test'} atf_test_program{name='ppp_test'} atf_test_program{name='static_test'} atf_test_program{name='tunnel_test'} diff --git a/tests/linux/mpls_test b/tests/linux/mpls_test new file mode 100755 index 0000000..1755c5c --- /dev/null +++ b/tests/linux/mpls_test @@ -0,0 +1,23 @@ +#!/usr/bin/env atf-sh + +. $(atf_get_srcdir)/../test_env.sh +EXECUTOR="$(atf_get_srcdir)/../../executor-scripts/linux/mpls" + +tests_init \ + mpls_enable \ + mpls_disable + +mpls_enable_body() { + export MOCK=echo IFACE=vlan2342 PHASE=pre-up IF_MPLS_ENABLE=yes + atf_check -s exit:0 \ + -o match:"modprobe mpls_iptunnel" \ + -o match:"echo 1 > /proc/sys/net/mpls/conf/vlan2342/input" \ + ${EXECUTOR} +} + +mpls_disable_body() { + export MOCK=echo IFACE=vlan2342 PHASE=pre-up IF_MPLS_ENABLE=no + atf_check -s exit:0 \ + -o match:"echo 0 > /proc/sys/net/mpls/conf/vlan2342/input" \ + ${EXECUTOR} +}