From 1e091a1493fc3f54396bfc4d4cbfd559dee95264 Mon Sep 17 00:00:00 2001
From: Darren 'Tadgy' Austin <darren@afterdark.org.uk>
Date: Thu, 7 Nov 2019 03:32:06 +0000
Subject: Initial commit of VLAN support.

---
 rc.inet1      | 35 +++++++++++++++++++++++++++++++----
 rc.inet1.conf | 14 ++++++++++++++
 2 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/rc.inet1 b/rc.inet1
index ebbd243..baeeddb 100644
--- a/rc.inet1
+++ b/rc.inet1
@@ -177,10 +177,33 @@ if_up() {
     debug_log "skipping ${1} early, interface is not configured in /etc/rc.d/rc.inet1.conf"
     return
   fi
-  if [ -e /sys/class/net/${1%%:*} ]; then # interface exists
+  if [ -e /sys/class/net/${1%%:*} ] || [ -e /sys/class/net/${1%%.*} ]; then # interface exists
     if ! /sbin/ip address show scope global dev ${1} 2>/dev/null | grep -Ewq '(inet|inet6)' || \
         ! /sbin/ip link show dev ${1} | grep -wq "state UP"; then # interface not up or not configured
-      # Set hardware address _before_ the interface goes up:
+      local IF_UP=0
+      # Handle VLAN interfaces before trying to configure IP addresses.
+      if echo "${IFNAME[$i]}" | grep -Fq .; then
+        iface="${IFNAME[$i]%.*}"
+        vlan="${IFNAME[$i]#*.}"
+        # Check if the underlying interface is already up.
+        if ! /sbin/ip link show dev ${iface} 2>/dev/null| grep -wq "state UP"; then
+          # Bring up the underlying interface.
+          echo "/etc/rc.d/rc.inet1:  /sbin/ip link set dev ${iface} up" | $LOGGER
+          if ! /sbin/ip link set dev ${iface} up; then
+            echo "/etc/rc.d/rc.inet1:  failed to bring up ${iface} for ${1}" | $LOGGER
+            return
+          fi
+          IF_UP=1
+        fi
+        # Configure the VLAN interface.
+        echo "/etc/rc.d/rc.inet1:  /sbin/ip link add link ${iface} name ${1} type vlan id ${vlan}" | $LOGGER
+        if ! /sbin/ip link add link ${iface} name ${1} type vlan id ${vlan}; then
+          echo "/etc/rc.d/rc.inet1:  failed to bring up VLAN interface ${1}" | $LOGGER
+          ((IF_UP == 1)) && /sbin/ip link set dev ${iface} down
+          return
+        fi
+      fi
+      # Set hardware address:
       if [ -n "${HWADDR[$i]}" ]; then
         echo "/etc/rc.d/rc.inet1:  /sbin/ip link set dev ${1} address ${HWADDR[$i]}" | $LOGGER
         /sbin/ip link set dev ${1} address ${HWADDR[$i]}
@@ -200,7 +223,7 @@ if_up() {
           echo "0" >/proc/sys/net/ipv6/conf/$1/accept_ra
         fi
       fi
-      local IF_UP=0
+      IF_UP=0
       # Slackware historically favours dynamic configuration over fixed IP to configure interfaces, so keep that tradition:
       if [ "${USE_DHCP[$i]}" = "yes" ] || { [ -e /proc/sys/net/ipv6 ] && [ "${USE_DHCP6[$i]}" = "yes" ]; }; then # use dhcpcd
         # Declare DHCP_OPTIONS array before adding new options to it:
@@ -379,7 +402,7 @@ if_down() {
       echo "0" >/proc/sys/net/ipv6/conf/$1/autoconf
       echo "0" >/proc/sys/net/ipv6/conf/$1/accept_ra
     fi
-    sleep 0.5 # allow time for dhcp/ra to unconfigure the interface
+    sleep 0.5 # allow time for DHCP/RA to unconfigure the interface
     # Flush any remaining IPs:
     echo "/etc/rc.d/rc.inet1:  /sbin/ip address flush dev ${1}" | $LOGGER
     /sbin/ip address flush dev ${1}
@@ -391,6 +414,10 @@ if_down() {
       cat /proc/sys/net/ipv6/conf/default/autoconf >/proc/sys/net/ipv6/conf/$1/autoconf
       cat /proc/sys/net/ipv6/conf/default/accept_ra >/proc/sys/net/ipv6/conf/$1/accept_ra
     fi
+    # Take down VLAN interface, if configured.
+    if echo "${1}" | grep -Fq .; then
+      /sbin/ip link delete ${1}
+    fi
     # Kill wireless daemons if any:
     if [ -x /etc/rc.d/rc.wireless ]; then
       . /etc/rc.d/rc.wireless ${1} stop
diff --git a/rc.inet1.conf b/rc.inet1.conf
index a39e5a1..c47497f 100644
--- a/rc.inet1.conf
+++ b/rc.inet1.conf
@@ -73,6 +73,20 @@ DEBUG_ETH_UP="no"
 
 # =============================================================================
 
+# Example of how to configure a VLAN interface.
+# The VLAN ID is taken from the full interface name.
+# IFNAME[0]="eth0.10"
+# IPADDR[0]="192.168.10.1"
+# NETMASK[0]="24"
+# IPALIASES[0]=""
+# USE_DHCP[0]=""
+# DHCP_HOSTNAME[0]=""
+# IP6ADDRS[0]=""
+# USE_SLAAC[0]=""
+# USE_DHCP6[0]=""
+
+# =============================================================================
+
 # Example of how to configure a bridge:
 # Note the added "BRNICS" variable which contains a space-separated list
 # of the physical or virtual network interfaces you want to add to the bridge.
-- 
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