Merge pull request #3794 from donaldsharp/sharp_import_check

Sharp import check

doc/user/sharp.rst

@@ -71,10 +71,15 @@ keyword. At present, no sharp commands will be preserved in the config.
    be used for pop and forward operations when the specified label is seen.
 
 .. index:: sharp watch
-.. clicmd:: sharp watch nexthop <A.B.C.D|X:X::X:X>
+.. clicmd:: [no] sharp watch <nexthop|import> <A.B.C.D|X:X::X:X> [connected]
 
    Instruct zebra to monitor and notify sharp when the specified nexthop is
    changed. The notification from zebra is written into the debug log.
+   The nexthop or import choice chooses the type of nexthop we are asking
+   zebra to watch for us.  This choice affects zebra's decision on what
+   matches.  Connected tells zebra whether or not that we want the route
+   matched against to be a static or connected route.  The no form of
+   the command obviously turns this watching off.
 
 .. index:: sharp data nexthop
 .. clicmd:: sharp data nexthop

sharpd/sharp_vty.c

@@ -39,14 +39,22 @@
 #endif
 
 DEFPY(watch_nexthop_v6, watch_nexthop_v6_cmd,
-      "sharp watch nexthop X:X::X:X$nhop [connected$connected]",
+      "sharp watch <nexthop$n|import$import> X:X::X:X$nhop [connected$connected]",
       "Sharp routing Protocol\n"
       "Watch for changes\n"
       "Watch for nexthop changes\n"
+      "Watch for import check changes\n"
       "The v6 nexthop to signal for watching\n"
       "Should the route be connected\n")
 {
 	struct prefix p;
+	bool type_import;
+
+
+	if (n)
+		type_import = false;
+	else
+		type_import = true;
 
 	memset(&p, 0, sizeof(p));
 
@@ -55,29 +63,36 @@ DEFPY(watch_nexthop_v6, watch_nexthop_v6_cmd,
 	p.family = AF_INET6;
 
 	sharp_nh_tracker_get(&p);
-	sharp_zebra_nexthop_watch(&p, true, !!connected);
+	sharp_zebra_nexthop_watch(&p, type_import, true, !!connected);
 
 	return CMD_SUCCESS;
 }
 
 DEFPY(watch_nexthop_v4, watch_nexthop_v4_cmd,
-      "sharp watch nexthop A.B.C.D$nhop [connected$connected]",
+      "sharp watch <nexthop$n|import$import> A.B.C.D$nhop [connected$connected]",
       "Sharp routing Protocol\n"
       "Watch for changes\n"
       "Watch for nexthop changes\n"
+      "Watch for import check changes\n"
       "The v4 nexthop to signal for watching\n"
       "Should the route be connected\n")
 {
 	struct prefix p;
+	bool type_import;
 
 	memset(&p, 0, sizeof(p));
 
+	if (n)
+		type_import = false;
+	else
+		type_import = true;
+
 	p.prefixlen = 32;
 	p.u.prefix4 = nhop;
 	p.family = AF_INET;
 
 	sharp_nh_tracker_get(&p);
-	sharp_zebra_nexthop_watch(&p, true, !!connected);
+	sharp_zebra_nexthop_watch(&p, type_import, true, !!connected);
 
 	return CMD_SUCCESS;
 }

sharpd/sharp_zebra.c

@@ -320,12 +320,22 @@ void route_delete(struct prefix *p, uint8_t instance)
 	return;
 }
 
-void sharp_zebra_nexthop_watch(struct prefix *p, bool watch, bool connected)
+void sharp_zebra_nexthop_watch(struct prefix *p, bool import,
+			       bool watch, bool connected)
 {
-	int command = ZEBRA_NEXTHOP_REGISTER;
+	int command;
 
-	if (!watch)
-		command = ZEBRA_NEXTHOP_UNREGISTER;
+	if (!import) {
+		command = ZEBRA_NEXTHOP_REGISTER;
+
+		if (!watch)
+			command = ZEBRA_NEXTHOP_UNREGISTER;
+	} else {
+		command = ZEBRA_IMPORT_ROUTE_REGISTER;
+
+		if (!watch)
+			command = ZEBRA_IMPORT_ROUTE_UNREGISTER;
+	}
 
 	if (zclient_send_rnh(zclient, command, p, connected, VRF_DEFAULT) < 0)
 		zlog_warn("%s: Failure to send nexthop to zebra",
@@ -405,4 +415,5 @@ void sharp_zebra_init(void)
 	zclient->interface_address_delete = interface_address_delete;
 	zclient->route_notify_owner = route_notify_owner;
 	zclient->nexthop_update = sharp_nexthop_update;
+	zclient->import_check_update = sharp_nexthop_update;
 }

sharpd/sharp_zebra.h

@@ -28,8 +28,8 @@ extern void vrf_label_add(vrf_id_t vrf_id, afi_t afi, mpls_label_t label);
 extern void route_add(struct prefix *p, uint8_t instance,
 		      struct nexthop_group *nhg);
 extern void route_delete(struct prefix *p, uint8_t instance);
-extern void sharp_zebra_nexthop_watch(struct prefix *p, bool watch,
-				      bool connected);
+extern void sharp_zebra_nexthop_watch(struct prefix *p, bool import,
+				      bool watch, bool connected);
 
 extern void sharp_install_routes_helper(struct prefix *p, uint8_t instance,
 					 struct nexthop_group *nhg,