From 7ac0561ab349bb33a1b6bb6c31fb73bbe5ca3dbd Mon Sep 17 00:00:00 2001
From: Darren 'Tadgy' Austin <darren@afterdark.org.uk>
Date: Wed, 13 Nov 2019 03:15:40 +0000
Subject: Create and document a new VLANOPTS variable.

This variable can be used to set custom options to configure the VLAN
interface.  It does not need to be used in 'normal' operation with a VLAN.
---
 rc.inet1      | 6 ++++++
 rc.inet1.conf | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/rc.inet1 b/rc.inet1
index c19571f..66e90a8 100644
--- a/rc.inet1
+++ b/rc.inet1
@@ -271,6 +271,12 @@ if_up() {
           ((IF_UP == 1)) && /sbin/ip link set dev ${iface} down
           return
         fi
+        while read -r -d \| VLANOPT; do
+          if [ -n "$VLANOPT" ]; then
+            debug_log "/sbin/ip link set dev ${1} type vlan $VLANOPT"
+            /sbin/ip link set dev ${1} type vlan $VLANOPT
+          fi
+        done <<<"${VLANOPTS[$i]}|"	# The | on the end is required.
       fi
       # Set hardware address:
       if [ -n "${HWADDR[$i]}" ]; then
diff --git a/rc.inet1.conf b/rc.inet1.conf
index e48f5c1..f4d54b1 100644
--- a/rc.inet1.conf
+++ b/rc.inet1.conf
@@ -98,7 +98,13 @@ DEBUG_ETH_UP="no"
 # Example of how to configure a VLAN interface.
 # The VLAN ID is taken from the full interface name, which is comprised of the
 # underlying interface name, a period (.) and then the VLAN ID.
+# VLANOPTS is a pipe (|) delimited list of VLAN module specific settings to be
+# applied to the interface.  See the ip-link(8) man page (search for "VLAN Type
+# Support") for details of the options available.  This option is not required
+# for a standard VLAN to be configured.
+#
 # IFNAME[0]="eth0.10"
+# VLANOPTS[0]=""
 # IPADDR[0]="192.168.10.1"
 # NETMASK[0]="24"
 # IPALIASES[0]=""
-- 
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