tests: Add basic test for route notifier.

Add basic test for route notifier in very similar fashion to what
we already have for neighbor notifications.

Assisted-by: Claude, with model: claude-opus-4-6
Acked-by: Dumitru Ceara <dceara@redhat.com>
Signed-off-by: Ales Musil <amusil@redhat.com>

Author: almusil

tests/system-common-macros.at

@@ -400,6 +400,9 @@ m4_define([VRF_RESERVE],
     ]
 )
 
+# RTPROT_OVN - the routing protocol number used by OVN.
+m4_define([RTPROT_OVN], [84])
+
 # OVN_ROUTE_EQUAL([vrf], [string to compare])
 #
 # Will dump all v4 routes in the mentioned vrf. Trailing spaces will be removed

tests/system-ovn-netlink.at

@@ -495,3 +495,45 @@ blackhole fd20:100::/64 dev lo proto ovn metric 1024 pref medium
 fe80::/64 dev lo-test proto kernel metric 256 pref medium])
 
 AT_CLEANUP
+
+AT_SETUP([sync netlink routes - table notify])
+AT_KEYWORDS([netlink-routes])
+CHECK_VRF()
+
+table_id=100
+
+check ip link add vrf-$table_id type vrf table $table_id
+on_exit 'ip link del vrf-$table_id'
+check ip link set dev vrf-$table_id up
+
+check ip link add lo-test type dummy
+on_exit 'ip link del lo-test'
+check ip link set lo-test master vrf-$table_id
+check ip link set lo-test address 00:00:00:00:00:10
+check ip addr add 20.0.0.10/24 dev lo-test
+check ip addr add fd20::10/64 dev lo-test
+check ip link set up lo-test
+
+dnl Should notify if an IPv4 route is added to a table monitored by OVN.
+AT_CHECK_UNQUOTED([ovstest test-ovn-netlink route-table-notify \
+    "ip route add 10.10.10.0/24 via 20.0.0.1 vrf vrf-$table_id"], [0], [dnl
+Notification v4 table_id=$table_id
+])
+
+dnl Should notify if an IPv6 route is added to a table monitored by OVN.
+AT_CHECK_UNQUOTED([ovstest test-ovn-netlink route-table-notify \
+    "ip -6 route add fd10::/64 via fd20::1 vrf vrf-$table_id"], [0], [dnl
+Notification v6 table_id=$table_id
+])
+
+dnl Should NOT notify if a route with proto ovn is added.
+AT_CHECK_UNQUOTED([ovstest test-ovn-netlink route-table-notify \
+    "ip route add 10.10.20.0/24 via 20.0.0.1 vrf vrf-$table_id proto RTPROT_OVN"], [0], [dnl
+])
+
+dnl Should NOT notify if an IPv6 route with proto ovn is added.
+AT_CHECK_UNQUOTED([ovstest test-ovn-netlink route-table-notify \
+    "ip -6 route add fd20:200::/64 via fd20::1 vrf vrf-$table_id proto RTPROT_OVN"], [0], [dnl
+])
+
+AT_CLEANUP

tests/test-ovn-netlink.c

@@ -250,6 +250,35 @@ test_route_sync(struct ovs_cmdl_context *ctx)
     ds_destroy(&msg);
 }
 
+static void
+test_route_table_notify(struct ovs_cmdl_context *ctx)
+{
+    unsigned int shift = 1;
+
+    const char *cmd = test_read_value(ctx, shift++, "shell_command");
+    if (!cmd) {
+        return;
+    }
+
+    ovn_netlink_update_notifier(OVN_NL_NOTIFIER_ROUTE_V4, true);
+    ovn_netlink_update_notifier(OVN_NL_NOTIFIER_ROUTE_V6, true);
+    run_command_under_notifier(cmd);
+
+    uint32_t table_id;
+
+    struct vector *msgs = ovn_netlink_get_msgs(OVN_NL_NOTIFIER_ROUTE_V4);
+    VECTOR_FOR_EACH (msgs, table_id) {
+        printf("Notification v4 table_id=%"PRIu32"\n", table_id);
+    }
+
+    msgs = ovn_netlink_get_msgs(OVN_NL_NOTIFIER_ROUTE_V6);
+    VECTOR_FOR_EACH (msgs, table_id) {
+        printf("Notification v6 table_id=%"PRIu32"\n", table_id);
+    }
+
+    ovn_netlink_notifiers_destroy();
+}
+
 static void
 test_ovn_netlink(int argc, char *argv[])
 {
@@ -260,6 +289,8 @@ test_ovn_netlink(int argc, char *argv[])
          test_neighbor_table_notify, OVS_RO},
         {"host-if-monitor", NULL, 2, 3, test_host_if_monitor, OVS_RO},
         {"route-sync", NULL, 1, INT_MAX, test_route_sync, OVS_RO},
+        {"route-table-notify", NULL, 1, 1,
+         test_route_table_notify, OVS_RO},
         {NULL, NULL, 0, 0, NULL, OVS_RO},
     };
     struct ovs_cmdl_context ctx;