ovs-router: Add "ovs/route/lookup" command

This command is useful at least for testing. Example output: % ovs-appctl ovs/route/lookup '10.0.0.1' gateway 172.17.0.254 dev wm0 % Signed-off-by: YAMAMOTO Takashi <[email protected]> Acked-by: Pravin B Shelar <[email protected]>
russellb · Dec 12, 2014 · bc78679 · bc78679
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diff --git a/README-native-tunneling.md b/README-native-tunneling.md
@@ -57,6 +57,8 @@ Tunnel routing table:
        ovs-appctl ovs/route/show
     To del route:
        ovs-appctl ovs/route/del <IP address>/<prefix length>
+    To look up and display the route for a destination:
+       ovs-appctl ovs/route/lookup <IP address>
 
 ARP:
     To see arp cache content:

diff --git a/lib/ovs-router.c b/lib/ovs-router.c
@@ -260,6 +260,31 @@ ovs_router_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
     ds_destroy(&ds);
 }
 
+static void
+ovs_router_lookup_cmd(struct unixctl_conn *conn, int argc OVS_UNUSED,
+                      const char *argv[], void *aux OVS_UNUSED)
+{
+    ovs_be32 ip;
+    unsigned int plen;
+
+    if (scan_ipv4_route(argv[1], &ip, &plen) && plen == 32) {
+        char iface[IFNAMSIZ];
+        ovs_be32 gw;
+
+        if (ovs_router_lookup(ip, iface, &gw)) {
+            struct ds ds = DS_EMPTY_INITIALIZER;
+
+            ds_put_format(&ds, "gateway " IP_FMT "\n", IP_ARGS(gw));
+            ds_put_format(&ds, "dev %s\n", iface);
+            unixctl_command_reply(conn, ds_cstr(&ds));
+        } else {
+            unixctl_command_reply(conn, "Not found");
+        }
+    } else {
+        unixctl_command_reply(conn, "Invalid parameters");
+    }
+}
+
 void
 ovs_router_flush(void)
 {
@@ -289,4 +314,6 @@ ovs_router_init(void)
     unixctl_command_register("ovs/route/show", "", 0, 0, ovs_router_show, NULL);
     unixctl_command_register("ovs/route/del", "ipv4_addr/prefix_len", 1, 1, ovs_router_del,
                              NULL);
+    unixctl_command_register("ovs/route/lookup", "ipv4_addr", 1, 1,
+                             ovs_router_lookup_cmd, NULL);
 }