dhclient: T3392: Changed dhclient-script hooks for VRF

There were two problems with VRF support inside dhclient-script:
- VRF check inside the `01-vyos-cleanup` hook was needless because it will be done inside the `03-vyos-ipwrapper` anyway;
- VRF was ignored for in-kernel routes in `03-vyos-ipwrapper`. Theoretically, there must be no situation now when this can leads to a real problem, but better will be to keep both kernel and FRR backends in sync.

Also, the way to get and use a VRF name was changed to an easier one.

2 files changed, 11 insertions, 20 deletions

diff --git a/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper b/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper
index fc035766b..74a7e83bf 100644
--- a/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper
+++ b/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper
@@ -3,6 +3,9 @@
 # default route distance
 IF_METRIC=${IF_METRIC:-210}
 
+# Check if interface is inside a VRF
+VRF_OPTION=$(/usr/sbin/ip -j -d link show ${interface} | awk '{if(match($0, /.*"master":"(\w+)".*"info_slave_kind":"vrf"/, IFACE_DETAILS)) printf("vrf %s", IFACE_DETAILS[1])}')
+
 # get status of FRR
 function frr_alive () {
     /usr/lib/frr/watchfrr.sh all_status
@@ -51,12 +54,7 @@ function iptovtysh () {
         shift 2
     fi
 
-    # Add route to VRF routing table
-    local VTYSH_VRF_NAME=$(/usr/sbin/ip link show dev $VTYSH_DEV | sed -nre '1s/.* master ([^ ]*) .*/\1/p')
-    if /usr/sbin/ip -d link show dev $VTYSH_DEV | grep -q "vrf_slave"; then
-        VTYSH_VRF="vrf $VTYSH_VRF_NAME"
-    fi
-    VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE $VTYSH_VRF"
+    VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE $VRF_OPTION"
 
     # delete route if the command is "del"
     if [ "$VTYSH_ACTION" == "del" ] ; then
@@ -67,10 +65,10 @@ function iptovtysh () {
 
 # delete the same route from kernel before adding new one
 function delroute () {
-    logmsg info "Checking if the route presented in kernel: $@"
-    if /usr/sbin/ip route show $@ | grep -qx "$1 " ; then
-        logmsg info "Deleting IP route: \"/usr/sbin/ip route del $@\""
-        /usr/sbin/ip route del $@
+    logmsg info "Checking if the route presented in kernel: $@ $VRF_OPTION"
+    if /usr/sbin/ip route show $@ $VRF_OPTION | grep -qx "$1 " ; then
+        logmsg info "Deleting IP route: \"/usr/sbin/ip route del $@ $VRF_OPTION\""
+        /usr/sbin/ip route del $@ $VRF_OPTION
     fi
 }
 
@@ -90,8 +88,7 @@ function ip () {
         else
             # add ip route to kernel
             logmsg info "Modifying routes in kernel: \"/usr/sbin/ip $@\""
-            /usr/sbin/ip $@
+            /usr/sbin/ip $@ $VRF_OPTION
         fi
     fi
 }
-
diff --git a/src/etc/dhcp/dhclient-exit-hooks.d/01-vyos-cleanup b/src/etc/dhcp/dhclient-exit-hooks.d/01-vyos-cleanup
index edb7c7b27..694d53b6b 100644
--- a/src/etc/dhcp/dhclient-exit-hooks.d/01-vyos-cleanup
+++ b/src/etc/dhcp/dhclient-exit-hooks.d/01-vyos-cleanup
@@ -17,14 +17,8 @@ if [[ $reason =~ (EXPIRE|FAIL|RELEASE|STOP) ]]; then
 
     # try to delete default ip route 
     for router in $old_routers; do
-        # check if we are bound to a VRF
-        local vrf_name=$(basename /sys/class/net/${interface}/upper_* | sed -e 's/upper_//')
-        if [ -n $vrf_name ]; then
-            vrf="vrf $vrf_name"
-        fi
-
-        logmsg info "Deleting default route: via $router dev ${interface} ${if_metric:+metric $if_metric} ${vrf}"
-        ip -4 route del default via $router dev ${interface} ${if_metric:+metric $if_metric} ${vrf}
+        logmsg info "Deleting default route: via $router dev ${interface} ${if_metric:+metric $if_metric}"
+        ip -4 route del default via $router dev ${interface} ${if_metric:+metric $if_metric}
 
         if_metric=$((if_metric+1))
     done