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Commit 40ec5e3f by Stéphane Graber
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lxc-net: Rework/cleanup

This updates lxc-net with the following changes: - Better recover from crashes/partial runs - Better error detection and reporting - Less code duplication (use the stop code on crash) - Better state tracking - Allow for restart of all of lxc-net except for the bridge itself - Only support iproute from this point on (ifconfig's been deprecated for years) V2: Use template variables everywhere Signed-off-by: 's avatarStéphane Graber <stgraber@ubuntu.com> Acked-by: 's avatarSerge E. Hallyn <serge.hallyn@ubuntu.com>
parent c775aec9
Showing with 34 additions and 63 deletions
config/init/common/lxc-net.in
#!/bin/sh -
distrosysconfdir="@LXC_DISTRO_SYSCONF@"
localstatedir="@LOCALSTATEDIR@"
varrun="@RUNTIME_PATH@/lxc"
# These can be overridden in @LXC_DISTRO_SYSCONF@/lxc
......@@ -24,11 +23,8 @@ LXC_IPV6_NAT="false"
[ ! -f $distrosysconfdir/lxc ] || . $distrosysconfdir/lxc
if [ -d "$localstatedir"/lock/subsys ]; then
lockdir="$localstatedir"/lock/subsys
else
lockdir="$localstatedir"/lock
fi
use_iptables_lock="-w"
iptables -w -L -n > /dev/null 2>&1 || use_iptables_lock=""
_netmask2cidr ()
{
......@@ -40,67 +36,43 @@ _netmask2cidr ()
}
ifdown() {
which ip >/dev/null 2>&1
if [ $? = 0 ]; then
ip link set dev $1 down
return
fi
which ifconfig >/dev/null 2>&1
if [ $? = 0 ]; then
ifconfig $1 down
return
fi
ip addr flush dev $1
ip link set dev $1 down
}
ifup() {
which ip >/dev/null 2>&1
if [ $? = 0 ]; then
MASK=`_netmask2cidr ${LXC_NETMASK}`
CIDR_ADDR="${LXC_ADDR}/${MASK}"
ip addr add ${CIDR_ADDR} dev $1
ip link set dev $1 up
return
fi
which ifconfig >/dev/null 2>&1
if [ $? = 0 ]; then
ifconfig $1 $2 netmask $3 up
return
fi
MASK=`_netmask2cidr ${LXC_NETMASK}`
CIDR_ADDR="${LXC_ADDR}/${MASK}"
ip addr add ${CIDR_ADDR} dev $1
ip link set dev $1 up
}
start() {
[ ! -f "${lockdir}"/lxc-net ] || { exit 0; }
[ "x$USE_LXC_BRIDGE" = "xtrue" ] || { exit 0; }
use_iptables_lock="-w"
iptables -w -L -n > /dev/null 2>&1 || use_iptables_lock=""
cleanup() {
# dnsmasq failed to start, clean up the bridge
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p udp --dport 67 -j ACCEPT
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p tcp --dport 67 -j ACCEPT
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p udp --dport 53 -j ACCEPT
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p tcp --dport 53 -j ACCEPT
iptables $use_iptables_lock -D FORWARD -i ${LXC_BRIDGE} -j ACCEPT
iptables $use_iptables_lock -D FORWARD -o ${LXC_BRIDGE} -j ACCEPT
iptables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE || true
iptables $use_iptables_lock -t mangle -D POSTROUTING -o ${LXC_BRIDGE} -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
[ ! -f "${varrun}/network_up" ] || { echo "lxc-net is already running"; exit 1; }
if [ "$LXC_IPV6_NAT" = "true" ]; then
ip6tables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_IPV6_NETWORK} ! -d ${LXC_IPV6_NETWORK} -j MASQUERADE || true
fi
if [ -d /sys/class/net/${LXC_BRIDGE} ]; then
stop force || true
fi
ifdown ${LXC_BRIDGE}
brctl delbr ${LXC_BRIDGE} || true
FAILED=1
cleanup() {
set +e
if [ "$FAILED" = "1" ]; then
echo "Failed to setup lxc-net." >&2
stop force
fi
}
if [ -d /sys/class/net/${LXC_BRIDGE} ]; then
exit 0;
fi
trap cleanup EXIT HUP INT TERM
set -e
# set up the lxc network
brctl addbr ${LXC_BRIDGE} || { echo "Missing bridge support in kernel"; stop; exit 0; }
[ ! -d /sys/class/net/${LXC_BRIDGE} ] && brctl addbr ${LXC_BRIDGE}
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv6/conf/${LXC_BRIDGE}/accept_dad || true
# if we are run from systemd on a system with selinux enabled,
# the mkdir will create /run/lxc as init_var_run_t which dnsmasq
......@@ -146,21 +118,19 @@ start() {
break
fi
done
dnsmasq $LXC_DOMAIN_ARG -u ${DNSMASQ_USER} --strict-order --bind-interfaces --pid-file="${varrun}"/dnsmasq.pid --conf-file=${LXC_DHCP_CONFILE} --listen-address ${LXC_ADDR} --dhcp-range ${LXC_DHCP_RANGE} --dhcp-lease-max=${LXC_DHCP_MAX} --dhcp-no-override --except-interface=lo --interface=${LXC_BRIDGE} --dhcp-leasefile=/var/lib/misc/dnsmasq.${LXC_BRIDGE}.leases --dhcp-authoritative $LXC_IPV6_ARG || cleanup
touch "${varrun}"/network_up
touch "${lockdir}"/lxc-net
FAILED=0
}
stop() {
[ "x$USE_LXC_BRIDGE" = "xtrue" ] || { exit 0; }
[ -f "${varrun}/network_up" ] || { exit 0; }
# if $LXC_BRIDGE has attached interfaces, don't shut it down
ls /sys/class/net/${LXC_BRIDGE}/brif/* > /dev/null 2>&1 && exit 0;
[ -f "${varrun}/network_up" ] || [ "$1" = "force" ] || { echo "lxc-net isn't running"; exit 1; }
if [ -d /sys/class/net/${LXC_BRIDGE} ]; then
use_iptables_lock="-w"
iptables -w -L -n > /dev/null 2>&1 || use_iptables_lock=""
ifdown ${LXC_BRIDGE}
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p udp --dport 67 -j ACCEPT
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p tcp --dport 67 -j ACCEPT
......@@ -168,19 +138,20 @@ stop() {
iptables $use_iptables_lock -D INPUT -i ${LXC_BRIDGE} -p tcp --dport 53 -j ACCEPT
iptables $use_iptables_lock -D FORWARD -i ${LXC_BRIDGE} -j ACCEPT
iptables $use_iptables_lock -D FORWARD -o ${LXC_BRIDGE} -j ACCEPT
iptables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE || true
iptables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_NETWORK} ! -d ${LXC_NETWORK} -j MASQUERADE
iptables $use_iptables_lock -t mangle -D POSTROUTING -o ${LXC_BRIDGE} -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
if [ "$LXC_IPV6_NAT" = "true" ]; then
ip6tables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_IPV6_NETWORK} ! -d ${LXC_IPV6_NETWORK} -j MASQUERADE || true
ip6tables $use_iptables_lock -t nat -D POSTROUTING -s ${LXC_IPV6_NETWORK} ! -d ${LXC_IPV6_NETWORK} -j MASQUERADE
fi
pid=`cat "${varrun}"/dnsmasq.pid 2>/dev/null` && kill -9 $pid || true
pid=`cat "${varrun}"/dnsmasq.pid 2>/dev/null` && kill -9 $pid
rm -f "${varrun}"/dnsmasq.pid
brctl delbr ${LXC_BRIDGE}
# if $LXC_BRIDGE has attached interfaces, don't destroy the bridge
ls /sys/class/net/${LXC_BRIDGE}/brif/* > /dev/null 2>&1 || brctl delbr ${LXC_BRIDGE}
fi
rm -f "${varrun}"/network_up
rm -f "${lockdir}"/lxc-net
}
# See how we were called.
......
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