[Bug 633392] Re: Bridged Guests losing network connectivity
Andrew Klettke
633392 at bugs.launchpad.net
Wed Sep 8 21:23:17 BST 2010
Here is the netstart script:
#!/bin/sh -
#
# $OpenBSD: netstart,v 1.129 2010/01/12 07:43:41 henning Exp $
# Strip comments (and leading/trailing whitespace if IFS is set)
# from a file and spew to stdout
stripcom() {
local _l
[[ -f $1 ]] || return
while read _l; do
[[ -n ${_l%%#*} ]] && echo $_l
done<$1
}
# Returns true if $1 contains only alphanumerics
isalphanumeric() {
local _n
_n=$1
while [ ${#_n} != 0 ]; do
case $_n in
[A-Za-z0-9]*) ;;
*) return 1;;
esac
_n=${_n#?}
done
return 0
}
# Start the $1 interface
ifstart() {
if=$1
# Interface names must be alphanumeric only. We check to avoid
# configuring backup or temp files, and to catch the "*" case.
if ! isalphanumeric "$if"; then
return
fi
file=/etc/hostname.$if
if ! [ -f $file ]; then
echo "netstart: $file: No such file or directory"
return
fi
# Not using stat(1), we can't rely on having /usr yet
set -A stat -- `ls -nL $file`
if [ "${stat[0]#???????} ${stat[2]} ${stat[3]}" != "--- 0 0" ]; then
echo "WARNING: $file is insecure, fixing permissions"
chmod -LR o-rwx $file
chown -LR root.wheel $file
fi
ifconfig $if > /dev/null 2>&1
if [ "$?" != "0" ]; then
# Try to create interface if it does not exist
ifconfig $if create > /dev/null 2>&1
if [ "$?" != "0" ]; then
return
fi
fi
# Now parse the hostname.* file
while :; do
if [ "$cmd2" ]; then
# We are carrying over from the 'read dt dtaddr'
# last time.
set -- $cmd2
af="$1" name="$2" mask="$3" bcaddr="$4" ext1="$5" cmd2=
# Make sure and get any remaining args in ext2,
# like the read below
i=1
while [ $i -lt 6 -a -n "$1" ]; do shift; let i=i+1; done
ext2="$@"
else
# Read the next line or exit the while loop.
read af name mask bcaddr ext1 ext2 || break
fi
# $af can be "dhcp", "up", "rtsol", an address family,
# commands, or a comment.
case "$af" in
"#"*|"") # skip comments and empty lines
continue
;;
"!"*) # parse commands
cmd="${af#*!} ${name} ${mask} ${bcaddr} ${ext1} ${ext2}"
;;
"dhcp")
[ "$name" = "NONE" ] && name=
[ "$mask" = "NONE" ] && mask=
[ "$bcaddr" = "NONE" ] && bcaddr=
cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 down"
cmd="$cmd;dhclient $if"
dhcpif="$dhcpif $if"
;;
"rtsol")
rtsolif="$rtsolif $if"
cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
;;
*)
read dt dtaddr
if [ "$name" = "alias" ]; then
# perform a 'shift' of sorts
alias=$name
name=$mask
mask=$bcaddr
bcaddr=$ext1
ext1=$ext2
ext2=
else
alias=
fi
cmd="ifconfig $if $af $alias $name"
case "$dt" in
dest)
cmd="$cmd $dtaddr"
;;
[a-z!]*)
cmd2="$dt $dtaddr"
;;
esac
case $af in
inet)
if [ ! -n "$name" ]; then
echo "/etc/hostname.$if: inet alone is invalid"
return
fi
[ "$mask" ] && cmd="$cmd netmask $mask"
if [ "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then
cmd="$cmd broadcast $bcaddr"
fi
[ "$alias" ] && rtcmd=";route -qn add -host $name 127.0.0.1"
;;
inet6)
if [ ! -n "$name" ]; then
echo "/etc/hostname.$if: inet6 alone is invalid"
return
fi
[ "$mask" ] && cmd="$cmd prefixlen $mask"
cmd="$cmd $bcaddr"
;;
*)
cmd="$cmd $mask $bcaddr"
;;
esac
cmd="$cmd $ext1 $ext2$rtcmd" rtcmd=
;;
esac
eval "$cmd"
done < /etc/hostname.$if
}
# Start multiple:
# start "$1" interfaces in order or all interfaces if empty
# don't start "$2" interfaces
ifmstart() {
for sif in ${1:-ALL}; do
for hn in /etc/hostname.*; do
# Strip off /etc/hostname. prefix
if=${hn#/etc/hostname.}
test "$if" = "*" && continue
# Skip unwanted ifs
s=""
for xf in $2; do
test "$xf" = "${if%%[0-9]*}" && s="1" && break
done
test "$s" = "1" && continue
# Start wanted ifs
test "$sif" = "ALL" -o \
"$sif" = "${if%%[0-9]*}" \
&& ifstart $if
done
done
}
# Re-read /etc/rc.conf
. /etc/rc.conf
# If we were invoked with a list of interface names, just reconfigure these
# interfaces (or bridges) and return.
if [ $1x = autobootx ]; then
shift
fi
if [ $# -gt 0 ]; then
while [ $# -gt 0 ]; do
ifstart $1
shift
done
return
fi
# Otherwise, process with the complete network initialization.
# /etc/myname contains my symbolic name
if [ -f /etc/myname ]; then
hostname=`stripcom /etc/myname`
hostname $hostname
else
hostname=`hostname`
fi
if [ -f /etc/defaultdomain ]; then
domainname `stripcom /etc/defaultdomain`
fi
# Set the address for the loopback interface. Bringing the
# interface up, automatically invokes the IPv6 address ::1)
ifconfig lo0 inet 127.0.0.1/8
if ifconfig lo0 inet6 >/dev/null 2>&1; then
# IPv6 configurations.
ip6kernel=YES
# Disallow link-local unicast dest without outgoing scope identifiers.
route -qn add -inet6 fe80:: -prefixlen 10 ::1 -reject > /dev/null
# Disallow site-local unicast dest without outgoing scope identifiers.
# If you configure site-locals without scope id (it is permissible
# config for routers that are not on scope boundary), you may want
# to comment the line out.
route -qn add -inet6 fec0:: -prefixlen 10 ::1 -reject > /dev/null
# Disallow "internal" addresses to appear on the wire.
route -qn add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null
# Disallow packets to malicious IPv4 compatible prefix.
route -qn add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject > /dev/null
route -qn add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject > /dev/null
route -qn add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject > /dev/null
route -qn add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject > /dev/null
# Disallow packets to malicious 6to4 prefix.
route -qn add -inet6 2002:e000:: -prefixlen 20 ::1 -reject > /dev/null
route -qn add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject > /dev/null
route -qn add -inet6 2002:0000:: -prefixlen 24 ::1 -reject > /dev/null
route -qn add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject > /dev/null
# Disallow packets without scope identifier.
route -qn add -inet6 ff01:: -prefixlen 16 ::1 -reject > /dev/null
route -qn add -inet6 ff02:: -prefixlen 16 ::1 -reject > /dev/null
# Completely disallow packets to IPv4 compatible prefix.
# This may conflict with RFC1933 under following circumstances:
# (1) An IPv6-only KAME node tries to originate packets to IPv4
# compatible destination. The KAME node has no IPv4 compatible
# support. Under RFC1933, it should transmit native IPv6
# packets toward IPv4 compatible destination, hoping it would
# reach a router that forwards the packet toward auto-tunnel
# interface.
# (2) An IPv6-only node originates a packet to an IPv4 compatible
# destination. A KAME node is acting as an IPv6 router, and
# asked to forward it.
# Due to rare use of IPv4 compatible addresses, and security issues
# with it, we disable it by default.
route -qn add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null
rtsolif=""
else
ip6kernel=NO
fi
# Configure all the non-loopback interfaces which we know about, but
# do not start interfaces which must be delayed. Refer to hostname.if(5)
ifmstart "" "trunk vlan carp gif gre pfsync pppoe tun bridge"
# The trunk interfaces need to come up first in this list.
# The vlan interfaces need to come up after trunk.
# Configure all the carp interfaces which we know about before default route.
ifmstart "trunk vlan carp"
if [ "$ip6kernel" = "YES" -a "x$rtsolif" != "x" ]; then
fw=`sysctl -n net.inet6.ip6.forwarding`
ra=`sysctl -n net.inet6.ip6.accept_rtadv`
if [ "x$fw" = "x0" -a "x$ra" = "x1" ]; then
echo "IPv6 autoconf:$rtsolif"
rtsol $rtsolif
else
echo "WARNING: inconsistent config - check /etc/sysctl.conf for IPv6 autoconf"
fi
fi
# /etc/mygate, if it exists, contains the name of my gateway host
# that name must be in /etc/hosts.
[[ -z $dhcpif ]] && stripcom /etc/mygate | while read gw; do
[[ $gw == @(*:*) ]] && continue
route -qn delete default > /dev/null 2>&1
route -qn add -host default $gw && break
done
[[ -z $rtsolif ]] && stripcom /etc/mygate | while read gw; do
[[ $gw == !(*:*) ]] && continue
route -qn delete -inet6 default > /dev/null 2>&1
route -qn add -host -inet6 default $gw && break
done
# Multicast routing.
#
# The routing to the 224.0.0.0/4 net is setup according to these rules:
# multicast_host multicast_router route comment
# NO NO -reject no multicast
# NO YES none installed daemon will run
# YES/interface NO -interface YES=def. iface
# Any other combination -reject config error
route -qn delete 224.0.0.0/4 > /dev/null 2>&1
case "$multicast_host:$multicast_router" in
NO:NO)
route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject > /dev/null
;;
NO:YES)
;;
*:NO)
maddr=`if [ "$multicast_host" = "YES" ]; then
ed -s '!route -qn show -inet' <<EOF
/^default/p
EOF
else
ed -s "!ifconfig $multicast_host" <<EOF
/^ inet /p
EOF
fi 2> /dev/null`
if [ "X${maddr}" != "X" ]; then
set $maddr
route -qn add -net 224.0.0.0/4 -interface $2 > /dev/null
else
route -qn add -net 224.0.0.0/4 -interface \
127.0.0.1 -reject > /dev/null
fi
;;
*:*)
echo 'config error, multicasting disabled until rc.conf is fixed'
route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject > /dev/null
;;
esac
# Configure PPPoE, GIF, GRE and TUN interfaces, delayed because they require
# routes to be set. TUN might depend on PPPoE, and GIF or GRE may depend on
# either of them.
ifmstart "pppoe tun gif gre bridge"
# reject 127/8 other than 127.0.0.1
route -qn add -net 127 127.0.0.1 -reject > /dev/null
if [ "$ip6kernel" = "YES" ]; then
# this is to make sure DAD is completed before going further.
count=0
while [ $((count++)) -lt 10 -a "x"`sysctl -n net.inet6.ip6.dad_pending` != "x0" ]; do
sleep 1
done
fi
--
Bridged Guests losing network connectivity
https://bugs.launchpad.net/bugs/633392
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