zebra: convert interface ipv6 nd ra-hop-limit command to NB

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

yang/frr-zebra.yang

@@ -2379,6 +2379,25 @@ module frr-zebra {
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvRetransTimer";
         }
+        leaf cur-hop-limit {
+          type uint8;
+          description
+            "The value to be placed in the Cur Hop Limit field in
+            the Router Advertisement messages sent by the router.
+            A value of zero means unspecified (by this router).
+
+            If this parameter is not configured, the device SHOULD
+            use the IANA-specified value for the default IPv4
+            Time to Live (TTL) parameter that was in effect at the
+            time of implementation.";
+          reference
+            "RFC 3232: Assigned Numbers: RFC 1700 is Replaced by
+                       an On-line Database
+             RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
+                       - AdvCurHopLimit
+             IANA: IP Parameters
+                   (https://www.iana.org/assignments/ip-parameters)";
+        }
         leaf default-lifetime {
           type uint16 {
             range "0..9000";

zebra/rtadv.c

@@ -1573,49 +1573,24 @@ DEFUN (no_ipv6_nd_ra_fast_retrans,
 	return CMD_SUCCESS;
 }
 
-DEFPY (ipv6_nd_ra_hop_limit,
+DEFPY_YANG (ipv6_nd_ra_hop_limit,
        ipv6_nd_ra_hop_limit_cmd,
-       "ipv6 nd ra-hop-limit (0-255)$hopcount",
+       "[no] ipv6 nd ra-hop-limit ![(0-255)$hopcount]",
+       NO_STR
        "Interface IPv6 config commands\n"
        "Neighbor discovery\n"
        "Advertisement Hop Limit\n"
        "Advertisement Hop Limit in hops (default:64)\n")
 {
-	VTY_DECLVAR_CONTEXT(interface, ifp);
+	if (!no)
-	struct zebra_if *zif = ifp->info;
+		nb_cli_enqueue_change(vty,
-
+				      "./frr-zebra:zebra/ipv6-router-advertisements/cur-hop-limit",
-	if (if_is_loopback(ifp)) {
+				      NB_OP_MODIFY, hopcount_str);
-		vty_out(vty,
+	else
-			"Cannot configure IPv6 Router Advertisements on this interface\n");
+		nb_cli_enqueue_change(vty,
-		return CMD_WARNING_CONFIG_FAILED;
+				      "./frr-zebra:zebra/ipv6-router-advertisements/cur-hop-limit",
-	}
+				      NB_OP_DESTROY, NULL);
-
+	return nb_cli_apply_changes(vty, NULL);
-	zif->rtadv.AdvCurHopLimit = hopcount;
-
-	return CMD_SUCCESS;
-}
-
-DEFPY (no_ipv6_nd_ra_hop_limit,
-       no_ipv6_nd_ra_hop_limit_cmd,
-       "no ipv6 nd ra-hop-limit [(0-255)]",
-       NO_STR
-       "Interface IPv6 config commands\n"
-       "Neighbor discovery\n"
-       "Advertisement Hop Limit\n"
-       "Advertisement Hop Limit in hops\n")
-{
-	VTY_DECLVAR_CONTEXT(interface, ifp);
-	struct zebra_if *zif = ifp->info;
-
-	if (if_is_loopback(ifp)) {
-		vty_out(vty,
-			"Cannot configure IPv6 Router Advertisements on this interface\n");
-		return CMD_WARNING_CONFIG_FAILED;
-	}
-
-	zif->rtadv.AdvCurHopLimit = RTADV_DEFAULT_HOPLIMIT;
-
-	return CMD_SUCCESS;
 }
 
 DEFPY_YANG (ipv6_nd_ra_retrans_interval,
@@ -2740,7 +2715,6 @@ void rtadv_cmd_init(void)
 	install_element(INTERFACE_NODE, &no_ipv6_nd_ra_fast_retrans_cmd);
 	install_element(INTERFACE_NODE, &ipv6_nd_ra_retrans_interval_cmd);
 	install_element(INTERFACE_NODE, &ipv6_nd_ra_hop_limit_cmd);
-	install_element(INTERFACE_NODE, &no_ipv6_nd_ra_hop_limit_cmd);
 	install_element(INTERFACE_NODE, &ipv6_nd_suppress_ra_cmd);
 	install_element(INTERFACE_NODE, &ipv6_nd_ra_interval_cmd);
 	install_element(INTERFACE_NODE, &ipv6_nd_ra_lifetime_cmd);

zebra/zebra_nb.c

@@ -588,6 +588,13 @@ const struct frr_yang_module_info frr_zebra_info = {
 				.modify = lib_interface_zebra_ipv6_router_advertisements_retrans_timer_modify,
 			}
 		},
+		{
+			.xpath = "/frr-interface:lib/interface/frr-zebra:zebra/ipv6-router-advertisements/cur-hop-limit",
+			.cbs = {
+				.modify = lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_modify,
+				.destroy = lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_destroy,
+			}
+		},
 		{
 			.xpath = "/frr-interface:lib/interface/frr-zebra:zebra/ipv6-router-advertisements/default-lifetime",
 			.cbs = {

zebra/zebra_nb.h

@@ -195,6 +195,10 @@ int lib_interface_zebra_ipv6_router_advertisements_reachable_time_modify(
 	struct nb_cb_modify_args *args);
 int lib_interface_zebra_ipv6_router_advertisements_retrans_timer_modify(
 	struct nb_cb_modify_args *args);
+int lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_modify(
+	struct nb_cb_modify_args *args);
+int lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_destroy(
+	struct nb_cb_destroy_args *args);
 int lib_interface_zebra_ipv6_router_advertisements_default_lifetime_modify(
 	struct nb_cb_modify_args *args);
 int lib_interface_zebra_ipv6_router_advertisements_default_lifetime_destroy(

zebra/zebra_nb_config.c

@@ -2618,6 +2618,45 @@ int lib_interface_zebra_ipv6_router_advertisements_retrans_timer_modify(
 	return NB_OK;
 }
 
+/*
+ * XPath: /frr-interface:lib/interface/frr-zebra:zebra/ipv6-router-advertisements/cur-hop-limit
+ */
+int lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct interface *ifp;
+	struct zebra_if *zif;
+	uint8_t limit;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	ifp = nb_running_get_entry(args->dnode, NULL, true);
+	zif = ifp->info;
+	limit = yang_dnode_get_uint8(args->dnode, NULL);
+
+	zif->rtadv.AdvCurHopLimit = limit;
+
+	return NB_OK;
+}
+
+int lib_interface_zebra_ipv6_router_advertisements_cur_hop_limit_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	struct interface *ifp;
+	struct zebra_if *zif;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	ifp = nb_running_get_entry(args->dnode, NULL, true);
+	zif = ifp->info;
+
+	zif->rtadv.AdvCurHopLimit = RTADV_DEFAULT_HOPLIMIT;
+
+	return NB_OK;
+}
+
 /*
  * XPath: /frr-interface:lib/interface/frr-zebra:zebra/ipv6-router-advertisements/default-lifetime
  */