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#!/bin/sh
# Copyright (C) 2000-2009, Parallels, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# Common stuff for vzctl helper scripts
# get the name of the script
SELFNAME="${0##*/}"
# Set the sane umask
umask 022
# Error codes
VZ_INVALID_PARAMETER_SYNTAX=20
VZ_FS_NO_DISK_SPACE=46
VZ_FS_BAD_TMPL=47
VZ_FS_NEW_VE_PRVT=48
VZ_CHANGEPASS=74
VZ_CANT_ADDIP=34
VZ_IP_INUSE=78
# iptables parameters
VE_STATE_DIR="/var/lib/vzctl/veip/"
CONF_DIR="@PKGCONFDIR@/conf/"
ARPSEND_CMD="arpsend -c 1 -w 1"
IP_CMD="ip"
# For 'ip' and 'arpsend' to work,
# make sure these dirs are in $PATH
for d in /sbin /usr/sbin @SBINDIR@; do
case ":${PATH}:" in
*:"${d}":*)
;;
*)
PATH=${d}:$PATH
;;
esac
done
# Prints error message and exits
# Parameters:
# $1 - error message
# $2 - exit code
# Example of usage:
# vzerror "Fatal error" 1
vzerror()
{
# print errors to stderr too
ERR=$?
echo "$SELFNAME ERROR: $1" 1>&2
exit $2
}
# Prints warning message
# Parameters:
# $1 - a message
# Example of usage:
# vzwarning 'Invalid user'
vzwarning()
{
echo "$SELFNAME WARNING: $1" 1>&2
}
# Prints debug message
# Parameters:
# $* - debug message
# Example of usage:
# vzdebug Trying to start ls
vzdebug()
{
echo "$SELFNAME: $*" 1>&2
}
# Checks if environment variable exists,
# and exits with exit code 1 if not
# Parameters:
# $* - option names
# Example:
# vzcheckvar VEID IP_ADDR
vzcheckvar()
{
local var
for var; do
eval test -n "\"\$$var\"" ||
vzerror "Missing parameter: $var" $VZ_INVALID_PARAMETER_SYNTAX
done
}
# Creates a pair of veth devices, being one of them in the host, and the other
# inside the container The function should be called with the following env
# variables set:
#
# HNAME: The intended name of the device in the host side
# VNAME: The indented name of the device inside the container
# VEID: The numerical container id.
#
# HNAME and VNAME must be different, since they will at some point cohexist at
# the host side, and our name convention forced by vzctl tool guarantees that
# this shouldn't be a problem for sane setups.
#
# This function leaves the host device in the "link up" state, but with no
# further configuration. The container device setup is left entirely to the
# container.
#
# If the device given by HNAME in the host already exists, this function exits
# with no visible action.
vzcreatepair()
{
${IP_CMD} link show | grep -w -F $HNAME >/dev/null 2>&1 && return
${IP_CMD} netns exec $VEID ${IP_CMD} link add name $HNAME type veth peer name $VNAME
${IP_CMD} netns exec $VEID ${IP_CMD} link set $HNAME netns $$
${IP_CMD} link set $HNAME up
}
# Move an already existing interface to the network namespace given by VEID
vzmoveif()
{
${IP_CMD} link show | grep -w -F $HNAME >/dev/null 2>&1
if [ $? -ne 0 ]; then
vzerror "Can't move non-existent interface"
return;
fi
${IP_CMD} link set $HNAME netns $VEID
}
# Removes the interface referred to by VNAME from the container.
vzdestroylink()
{
${IP_CMD} netns exec $VEID ${IP_CMD} link delete $VNAME type veth
}
# Adjusts host-side and container's interface configuration so they have the
# desired mac addresses. The host mac address is given by HMAC, and the
# container's by VMAC. They are both optional parameters. If no mac is
# specified, this function does nothing.
vzadjustmacs()
{
if [ "x$HMAC" != "x" ]; then
${IP_CMD} link set dev $HNAME address $HMAC
fi
if [ "x$VMAC" != "x" ]; then
${IP_CMD} netns exec $VEID ${IP_CMD} link set dev $VNAME address $VMAC
fi
}
# Bridge configuration function.
#
# It allows us to automatically insert a given host-side interface (HNAME) into
# a bridge. Calling the bridge "venet0" has a special meaning, since this is a
# bridge expected to always exist in our setup. In this case, we'll make sure
# the bridge exists by creating it in case we are the first caller. For all
# other setups, the bridge is expected to already exist and be valid.
vzconfbridge()
{
if [ "x$BRIDGE" != "x" ]; then
brctl addif $BRIDGE $HNAME >/dev/null 2>&1
fi
}
# Move back an interface to the host namespace.
#
# When we move a physical host-side network device to the container, this is
# what we should call to undo the operation.
vzregainif()
{
${IP_CMD} netns exec $VEID ${IP_CMD} link set $VNAME netns $$
}
# This function fills $NETDEVICES with all network interfaces
# You should always call it before calling vzarp
vzgetnetdev()
{
# Get a list of interfaces, excluding ones with LOOPBACK,
# NOARP, or SLAVE flags
NETDEVICES=`${IP_CMD} addr list | awk '
/^[0-9]+: / {
dev="";
}
/^[0-9]+: / && /[^A-Z_]UP[^A-Z_]/ && !/[^A-Z_]LOOPBACK[^A-Z_]/ \
&& !/[^A-Z_]SLAVE[^A-Z_]/ && !/[^A-Z_]NOARP[^A-Z_]/ {
if ($2 !~ /^veth[0-9]+/)
dev=$2;
}
/^[\ \t]+inet6? / && !/ scope link/ {
if (dev != "") print (dev);
dev="";
}' | sed -e 's/:$//' -e 's/@.*$//'`
}
# Find neighbour interfaces for a given CT IP.
# Make sure to source @PKGCONFDIR@/vz.conf before calling this,
# in order to get the value of $NEIGHBOUR_DEVS from it.
vz_get_neighbour_devs()
{
[ -n "$NETDEVICES" ] || vzwarning 'Device list is empty'
[ -n "$1" -a -n "$NETDEVICES" ] || return 1
if [ "$NEIGHBOUR_DEVS" != 'detect' ]; then
echo $NETDEVICES
return 0
fi
local route devs dev netdev
route="$(${IP_CMD} route get "$1" |grep ' dev .* src ')"
# match: $1 ... dev $dev ...
devs="$(echo "$route" |sed -ne '/ via /! s/^.* dev \+\([^ ]\+\) .*$/\1/p;Q')"
[ -n "$devs" ] ||
# match: $1 ... via $1 ... dev $dev ...
devs="$(echo "$route" |sed -ne 's/^\([^ ]\+\) \(.* \)\?via \+\1 \(.* \)\?dev \+\([^ ]\+\) .*$/\4/p;Q')"
[ -n "$devs" ] || return 0
for netdev in $NETDEVICES; do
for dev in $devs; do
if [ "$dev" = "$netdev" ]; then
echo "$dev"
fi
done
done
}
# Adds/deletes public ARP records for given IP for all interfaces
# Parameters:
# $1 - should be either "add" or "del"
# $2 - IP address
# $NETDEVICES - Network devices used to take MAC addresses from
vzarp()
{
local dev
for dev in $(vz_get_neighbour_devs "$2"); do
${IP_CMD} neigh "$1" proxy "$2" dev "$dev" >/dev/null 2>&1
# Send ARP request to update neighbour ARP caches
if [ "$1" = "add" ]; then
${ARPSEND_CMD} -U -i "$2" -e "$2" "$dev" ||
vzwarning "$ARPSEND_CMD -U -i $2 -e $2 $dev FAILED"
fi
done
}
# Send ARP request to detect that somebody already have this IP
vzarpipdetect()
{
[ -n "$1" ] || return
[ "$SKIP_ARPDETECT" = 'yes' ] && return
local errwarn
[ "$ERROR_ON_ARPFAIL" = 'yes' ] && errwarn=vzerror || errwarn=vzwarning
local dev ipm ip
for ipm in $1; do
ip=${ipm%%/*}
for dev in $(vz_get_neighbour_devs "$ip"); do
${ARPSEND_CMD} -D -e "$ip" "$dev" ||
$errwarn "$ARPSEND_CMD -D -e $ip $dev FAILED" 1
done
done
}
vzaddrouting4()
{
local src_addr=
if [ -n "$VE_ROUTE_SRC_DEV" ]; then
src_addr=`${IP_CMD} route list table local dev "$VE_ROUTE_SRC_DEV" |
grep '^local' | cut -d' ' -f2 | grep -v '^127\.' | head -n 1`
[ -n "$src_addr" ] ||
vzerror "Unable to get source ip [${VE_ROUTE_SRC_DEV}]" $VZ_CANT_ADDIP
src_addr="src $src_addr"
fi
${IP_CMD} route add "$1" dev venet0 $src_addr ||
vzerror "Unable to add route ${IP_CMD} route add $1 dev venet0 $src_addr" $VZ_CANT_ADDIP
}
vzaddrouting6()
{
${IP_CMD} route add "$1" dev venet0 ||
vzerror "Unable to add route ${IP_CMD} route add $1 dev venet0" $VZ_CANT_ADDIP
}
# Sets VE0 source routing for given IP
# Parameters:
# $1 - IP address
vzaddrouting()
{
${IP_CMD} route list table all "$1" | fgrep -qs "$1 dev venet0" &&
return 0
if [ "${1#*:}" = "$1" ]; then
vzaddrouting4 "$1"
else
vzaddrouting6 "$1"
fi
}
# Deletes VE0 source routing for given IP
# Parameters:
# $1 - IP address
vzdelrouting()
{
${IP_CMD} route list table all "$1" | fgrep -qs "$1 dev venet0" ||
return 0
local arg
if [ "${1%%:*}" = "$1" ]; then
arg="route del $1 dev venet0"
else
arg="-6 route flush $1 dev venet0"
fi
${IP_CMD} $arg ||
vzwarning "vzdelrouting: ${IP_CMD} $arg failed"
}