selftests: fib_tests: add fib6 from ra to static test

The new test checks that a route that has been promoted from RA-learned
to static does not switch back when a new RA message arrives. In
addition, it checks that the route is owned by RA again when the static
address is removed.

Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>
Link: https://patch.msgid.link/20251115095939.6967-2-fmancera@suse.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index a94b73a53f72e5ff89ca17ed73297591e5d4ba17..a88f797c549a7858cd22dd801e81c7a9798cb190 100755 (executable)
--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -11,7 +11,8 @@ TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify \
        ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics \
        ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr \
        ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test \
-       ipv4_mpath_list ipv6_mpath_list ipv4_mpath_balance ipv6_mpath_balance"
+       ipv4_mpath_list ipv6_mpath_list ipv4_mpath_balance ipv6_mpath_balance \
+       fib6_ra_to_static"
 
 VERBOSE=0
 PAUSE_ON_FAIL=no
@@ -1476,6 +1477,68 @@ ipv6_route_metrics_test()
        route_cleanup
 }
 
+fib6_ra_to_static()
+{
+       setup
+
+       echo
+       echo "Fib6 route promotion from RA-learned to static test"
+       set -e
+
+       # ra6 is required for the test. (ipv6toolkit)
+       if [ ! -x "$(command -v ra6)" ]; then
+           echo "SKIP: ra6 not found."
+           set +e
+           cleanup &> /dev/null
+           return
+       fi
+
+       # Create a pair of veth devices to send a RA message from one
+       # device to another.
+       $IP link add veth1 type veth peer name veth2
+       $IP link set dev veth1 up
+       $IP link set dev veth2 up
+       $IP -6 address add 2001:10::1/64 dev veth1 nodad
+       $IP -6 address add 2001:10::2/64 dev veth2 nodad
+
+       # Make veth1 ready to receive RA messages.
+       $NS_EXEC sysctl -wq net.ipv6.conf.veth1.accept_ra=2
+
+       # Send a RA message with a prefix from veth2.
+       $NS_EXEC ra6 -i veth2 -d 2001:10::1 -P 2001:12::/64\#LA\#120\#60
+
+       # Wait for the RA message.
+       sleep 1
+
+       # systemd may mess up the test. Make sure that
+       # systemd-networkd.service and systemd-networkd.socket are stopped.
+       check_rt_num_clean 2 $($IP -6 route list|grep expires|wc -l) || return
+
+       # Configure static address on the same prefix
+       $IP -6 address add 2001:12::dead/64 dev veth1 nodad
+
+       # On-link route won't expire anymore, default route still owned by RA
+       check_rt_num 1 $($IP -6 route list |grep expires|wc -l)
+
+       # Send a second RA message with a prefix from veth2.
+       $NS_EXEC ra6 -i veth2 -d 2001:10::1 -P 2001:12::/64\#LA\#120\#60
+       sleep 1
+
+       # Expire is not back, on-link route is still static
+       check_rt_num 1 $($IP -6 route list |grep expires|wc -l)
+
+       $IP -6 address del 2001:12::dead/64 dev veth1 nodad
+
+       # Expire is back, on-link route is now owned by RA again
+       check_rt_num 2 $($IP -6 route list |grep expires|wc -l)
+
+       log_test $ret 0 "ipv6 promote RA route to static"
+
+       set +e
+
+       cleanup &> /dev/null
+}
+
 # add route for a prefix, flushing any existing routes first
 # expected to be the first step of a test
 add_route()
@@ -2798,6 +2861,7 @@ do
        ipv6_mpath_list)                ipv6_mpath_list_test;;
        ipv4_mpath_balance)             ipv4_mpath_balance_test;;
        ipv6_mpath_balance)             ipv6_mpath_balance_test;;
+       fib6_ra_to_static)              fib6_ra_to_static;;
 
        help) echo "Test names: $TESTS"; exit 0;;
        esac