[PATCH 3/3] rd.route should use the name from kdump_setup_ifname

[Coiby Xu]

This fix bz1854037 which happens because kexec-tools generates rd.route for
eth0 instead of for kdump-eth0,
 1. "rd.route=168.63.129.16:10.0.0.1:eth0
rd.route=169.254.169.254:10.0.0.1:eth0" is passed to the dracut cmdline by
kexec-tools
 2. In the 2rd kernel,
    - dracut/modules.d/40network/net-lib.sh will write /tmp/net.route.eth0 based on
rd.route
    - dracut/modules.d/45ifcfg/write-ifcfg.sh will copy /tmp/net.route.eth0 to /tmp/icfg
and then copytree /tmp/ifcfg to /run/initramfs/state/etc/sysconfig/network-scripts
 3. NetworkManager will try to get an IP for eth0 regardless of the fact it's a slave
NIC and time out
    ```
    $ ip link show
    2: kdump-eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode
DEFAULT group default qlen 1000
       link/ether 00:0d:3a:11:86:8b brd ff:ff:ff:ff:ff:ff
    3: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master
kdump-eth0 state UP mode DEFAULT group default qlen 1000
    ```

Reported-by: Huijing Hei <hhei(a)redhat.com&gt;
Signed-off-by: Coiby Xu <coxu(a)redhat.com&gt;
---
 dracut-module-setup.sh | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index d1c2c8d..5b67f86 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -235,7 +235,7 @@ cal_netmask_by_prefix() {
 #$2: srcaddr
 #if it use static ip echo it, or echo null
 kdump_static_ip() {
-    local _netdev="$1" _srcaddr="$2" _ipv6_flag
+    local _netdev="$1" _srcaddr="$2" kdumpnic="$3"
_ipv6_flag
     local _netmask _gateway _ipaddr _target _nexthop _prefix
 
     _ipaddr=$(ip addr show dev $_netdev permanent | awk "/ $_srcaddr\/.* /{print
\$2}")
@@ -273,10 +273,10 @@ kdump_static_ip() {
             _target="[$_target]"
             _nexthop="[$_nexthop]"
         fi
-        echo "rd.route=$_target:$_nexthop:$_netdev"
+        echo "rd.route=$_target:$_nexthop:$kdumpnic"
     done >> ${initdir}/etc/cmdline.d/45route-static.conf
 
-    kdump_handle_mulitpath_route $_netdev $_srcaddr
+    kdump_handle_mulitpath_route $_netdev $_srcaddr $kdumpnic
 }
 
 kdump_handle_mulitpath_route() {
@@ -299,9 +299,9 @@ kdump_handle_mulitpath_route() {
                 _nexthop=`echo "$_route" | cut -d ' ' -f3`
                 _max_weight=$_weight
                 if [ "x" !=  "x"$_ipv6_flag ]; then
-                    _rule="rd.route=[$_target]:[$_nexthop]:$_netdev"
+                    _rule="rd.route=[$_target]:[$_nexthop]:$kdumpnic"
                 else
-                    _rule="rd.route=$_target:$_nexthop:$_netdev"
+                    _rule="rd.route=$_target:$_nexthop:$kdumpnic"
                 fi
             fi
         else
@@ -491,7 +491,7 @@ kdump_install_net() {
         kdump_setup_znet $_netdev
     fi
 
-    _static=$(kdump_static_ip $_netdev $_srcaddr)
+    _static=$(kdump_static_ip $_netdev $_srcaddr $kdumpnic)
     if [ -n "$_static" ]; then
         _proto=none
     elif is_ipv6_address $_srcaddr; then
-- 
2.31.1