From 8eb81d482ce055d600e8a576c09073ce38b25dd7 Mon Sep 17 00:00:00 2001
From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Tue, 29 May 2012 17:00:28 +0800
Subject: [PATCH] Add vlan support in network module

This patch adds basic vlan support in network module.

The cmdline syntax for vlan is:

	vlan=<vlanname>:<phydevice>

for an example:

	vlan=eth0.2:eth0

or
	vlan=vlan2:eth0

See also patch 2/8.

Cc: Harald Hoyer <harald@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
---
 modules.d/40network/ifup.sh         | 29 ++++++++++++++++++++++++
 modules.d/40network/module-setup.sh |  3 +++
 modules.d/40network/net-genrules.sh |  5 +++++
 modules.d/40network/parse-vlan.sh   | 45 +++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 modules.d/40network/parse-vlan.sh

diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
index 71b869d..c03838f 100755
--- a/modules.d/40network/ifup.sh
+++ b/modules.d/40network/ifup.sh
@@ -40,6 +40,17 @@ if [ -e /tmp/bridge.info ]; then
     fi
 fi
 
+if [ -e /tmp/vlan.info ]; then
+    . /tmp/vlan.info
+    if [ "$netif" = "$phydevice" ]; then
+        if [ "$netif" = "$bondname" ] && [ -n "$DO_BOND_SETUP" ] ; then
+            : # We need to really setup bond (recursive call)
+        else
+            netif="$vlanname"
+        fi
+    fi
+fi
+
 # disable manual ifup while netroot is set for simplifying our logic
 # in netroot case we prefer netroot to bringup $netif automaticlly
 [ -n "$2" -a "$2" = "-m" ] && [ -z "$netroot" ] && manualup="$2"
@@ -178,6 +189,24 @@ if [ "$netif" = "$bridgename" ] && [ ! -e /tmp/net.$bridgename.up ]; then
     brctl addif $bridgename $ethname
 fi
 
+get_vid() {
+    case "$1" in
+    vlan*)
+        return ${1#vlan}
+        ;;
+    *.*)
+        return ${1##*.}
+        ;;
+    esac
+}
+
+if [ "$netif" = "$vlanname" ] && [ ! -e /tmp/net.$vlanname.up ]; then
+    modprobe 8021q
+    ip link set "$phydevice" up
+    wait_for_if_up "$phydevice"
+    ip link add dev "$vlanname" link "$phydevice" type vlan id "$(get_vid $vlanname; echo $?)"
+fi
+
 # No ip lines default to dhcp
 ip=$(getarg ip)
 
diff --git a/modules.d/40network/module-setup.sh b/modules.d/40network/module-setup.sh
index d49b594..f28286c 100755
--- a/modules.d/40network/module-setup.sh
+++ b/modules.d/40network/module-setup.sh
@@ -68,6 +68,8 @@ installkernel() {
     instmods ipv6
     # bonding
     instmods bonding
+    # vlan
+    instmods 8021q
 }
 
 install() {
@@ -82,6 +84,7 @@ install() {
     inst_hook pre-udev 50 "$moddir/ifname-genrules.sh"
     inst_hook pre-udev 60 "$moddir/net-genrules.sh"
     inst_hook cmdline 91 "$moddir/dhcp-root.sh"
+    inst_hook cmdline 95 "$moddir/parse-vlan.sh"
     inst_hook cmdline 96 "$moddir/parse-bond.sh"
     inst_hook cmdline 97 "$moddir/parse-bridge.sh"
     inst_hook cmdline 98 "$moddir/parse-ip-opts.sh"
diff --git a/modules.d/40network/net-genrules.sh b/modules.d/40network/net-genrules.sh
index 7176681..142634e 100755
--- a/modules.d/40network/net-genrules.sh
+++ b/modules.d/40network/net-genrules.sh
@@ -31,6 +31,11 @@ fix_bootif() {
         IFACES=${bondslaves%% *}
     fi
 
+    if [ -e /tmp/vlan.info ]; then
+        . /tmp/vlan.info
+        IFACES=$phydevice
+    fi
+
     ifup='/sbin/ifup $env{INTERFACE}'
     [ -z "$netroot" ] && ifup="$ifup -m"
 
diff --git a/modules.d/40network/parse-vlan.sh b/modules.d/40network/parse-vlan.sh
new file mode 100644
index 0000000..60b09d8
--- /dev/null
+++ b/modules.d/40network/parse-vlan.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+#
+# Format:
+#	vlan=<vlanname>:<phydevice>
+#
+
+# return if vlan already parsed
+[ -n "$vlanname" ] && return
+
+# Check if vlan parameter is valid
+if getarg vlan= >/dev/null ; then
+    if [ -z "$netroot" ] ; then
+        die "No netboot configured, vlan is invalid"
+    fi
+    :
+fi
+
+parsevlan() {
+    local v=${1}:
+    set --
+    while [ -n "$v" ]; do
+        set -- "$@" "${v%%:*}"
+        v=${v#*:}
+    done
+
+    unset vlanname phydevice
+    case $# in
+    2)  vlanname=$1; phydevice=$2 ;;
+    *)  die "vlan= requires two parameters" ;;
+    esac
+}
+
+unset vlanname phydevice
+
+if getarg vlan >/dev/null; then
+    # Read vlan= parameters if they exist
+    vlan="$(getarg vlan=)"
+    if [ ! "$vlan" = "vlan" ]; then
+        parsevlan "$(getarg vlan=)"
+    fi
+
+    echo "vlanname=\"$vlanname\"" > /tmp/vlan.info
+    echo "phydevice=\"$phydevice\"" >> /tmp/vlan.info
+    return
+fi
-- 
2.7.4