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dracut-module-setup: Fix routing failure on multipath route

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Currently we still don't support multipath route, when parsing multipath
route kdumpctl will wrongly consider 'nexthop' as the destination address,
and raise errors in second kernel.

When multipath route is in use, ip route output should be like this:
$ /sbin/ip route show
default via 192.168.122.1 dev ens1 proto dhcp metric 100
192.168.122.0/24 dev ens1 proto kernel scope link src 192.168.122.161 metric 100
192.168.122.8
	nexthop via 192.168.122.1 dev ens1 weight 50
	nexthop via 192.168.122.2 dev ens1 weight 5

As we don't care about HA/performance, simply use the rule with highest
weight and ignore the rest.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
This commit is contained in:
Kairui Song 2018-11-12 20:27:18 +08:00
parent d4f04afa47
commit a0dc92f46c
1 changed files with 40 additions and 1 deletions
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41
dracut-module-setup.sh
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@ -126,7 +126,8 @@ kdump_static_ip() {
echo -n "${_srcaddr}::${_gateway}:${_netmask}::" echo -n "${_srcaddr}::${_gateway}:${_netmask}::"
fi fi
/sbin/ip $_ipv6_flag route show | grep -v default | grep ".*via.* $_netdev " |\ /sbin/ip $_ipv6_flag route show | grep -v default |\
grep ".*via.* $_netdev " | grep -v "^[[:space:]]*nexthop" |\
while read _route; do while read _route; do
_target=`echo $_route | cut -d ' ' -f1` _target=`echo $_route | cut -d ' ' -f1`
_nexthop=`echo $_route | cut -d ' ' -f3` _nexthop=`echo $_route | cut -d ' ' -f3`
@ -136,6 +137,44 @@ kdump_static_ip() {
fi fi
echo "rd.route=$_target:$_nexthop:$_netdev" echo "rd.route=$_target:$_nexthop:$_netdev"
done >> ${initdir}/etc/cmdline.d/45route-static.conf done >> ${initdir}/etc/cmdline.d/45route-static.conf
kdump_handle_mulitpath_route $_netdev $_srcaddr
}
kdump_handle_mulitpath_route() {
local _netdev="$1" _srcaddr="$2" _ipv6_flag
local _target _nexthop _route _weight _max_weight _rule
if is_ipv6_address $_srcaddr; then
_ipv6_flag="-6"
fi
while IFS="" read _route; do
if [[ "$_route" =~ [[:space:]]+nexthop ]]; then
_route=$(echo "$_route" | sed -e 's/^[[:space:]]*//')
# Parse multipath route, using previous _target
[[ "$_target" == 'default' ]] && continue
[[ "$_route" =~ .*via.*\ $_netdev ]] || continue
_weight=`echo "$_route" | cut -d ' ' -f7`
if [[ "$_weight" -gt "$_max_weight" ]]; then
_nexthop=`echo "$_route" | cut -d ' ' -f3`
_max_weight=$_weight
if [ "x" != "x"$_ipv6_flag ]; then
_rule="rd.route=[$_target]:[$_nexthop]:$_netdev"
else
_rule="rd.route=$_target:$_nexthop:$_netdev"
fi
fi
else
[[ -n "$_rule" ]] && echo "$_rule"
_target=`echo "$_route" | cut -d ' ' -f1`
_rule="" _max_weight=0 _weight=0
fi
done >> ${initdir}/etc/cmdline.d/45route-static.conf\
< <(/sbin/ip $_ipv6_flag route show)
[[ -n $_rule ]] && echo $_rule >> ${initdir}/etc/cmdline.d/45route-static.conf
} }
kdump_get_mac_addr() { kdump_get_mac_addr() {