staticd: add support for SR Policies

Configuration example:

    ip route 9.9.9.9/32 6.6.6.6 color 123

The SR Policy to be chosen is uniquely identified by the policy
endpoint (6.6.6.6) and the SR-TE color (123). Traffic will be
augmented with an MPLS label stack according to the active
candidate path of that particular policy.

Co-authored-by: GalaxyGorilla <sascha@netdef.org>
Signed-off-by: Sebastien Merle <sebastien@netdef.org>

doc/user/static.rst

@@ -128,3 +128,15 @@ but this time, the route command will apply to the VRF.
     ip route 10.0.0.0/24 10.0.0.2
    exit-vrf
 
+
+SR-TE Route Commands
+====================
+
+It is possible to specify a route using a SR-TE policy configured in Zebra.
+
+e.g. to use the SR-TE policy with endpoint 6.6.6.6 and color 123 to reach the
+network 9.9.9.9/24:
+
+.. code-block:: frr
+
+  ip route 9.9.9.9/24 6.6.6.6 color 123

staticd/static_nb.c

@@ -75,6 +75,13 @@ const struct frr_yang_module_info frr_staticd_info = {
 				.destroy = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_onlink_destroy,
 			}
 		},
+		{
+			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/path-list/frr-nexthops/nexthop/srte-color",
+			.cbs = {
+				.modify = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_modify,
+				.destroy = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_destroy,
+			}
+		},
 		{
 			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/path-list/frr-nexthops/nexthop/mpls-label-stack/entry",
 			.cbs = {
@@ -153,6 +160,13 @@ const struct frr_yang_module_info frr_staticd_info = {
 				.destroy = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_onlink_destroy,
 			}
 		},
+		{
+			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/src-list/path-list/frr-nexthops/nexthop/srte-color",
+			.cbs = {
+				.modify = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_modify,
+				.destroy = routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_destroy,
+			}
+		},
 		{
 			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/src-list/path-list/frr-nexthops/nexthop/mpls-label-stack/entry",
 			.cbs = {

staticd/static_nb.h

@@ -45,6 +45,10 @@ int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_pa
 	struct nb_cb_modify_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_onlink_destroy(
 	struct nb_cb_destroy_args *args);
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_modify(
+	struct nb_cb_modify_args *args);
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_destroy(
+	struct nb_cb_destroy_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_mpls_label_stack_entry_create(
 	struct nb_cb_create_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_mpls_label_stack_entry_destroy(
@@ -85,6 +89,10 @@ int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_sr
 	struct nb_cb_modify_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_onlink_destroy(
 	struct nb_cb_destroy_args *args);
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_modify(
+	struct nb_cb_modify_args *args);
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_destroy(
+	struct nb_cb_destroy_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_mpls_label_stack_entry_create(
 	struct nb_cb_create_args *args);
 int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_mpls_label_stack_entry_destroy(
@@ -140,6 +148,8 @@ int routing_control_plane_protocols_name_validate(
 
 #define FRR_STATIC_ROUTE_NH_ONLINK_XPATH "/onlink"
 
+#define FRR_STATIC_ROUTE_NH_COLOR_XPATH "/srte-color"
+
 #define FRR_STATIC_ROUTE_NH_BH_XPATH "/bh-type"
 
 #define FRR_STATIC_ROUTE_NH_LABEL_XPATH "/mpls-label-stack"

staticd/static_nb_config.c

@@ -162,7 +162,7 @@ static bool static_nexthop_create(struct nb_cb_create_args *args,
 				yang_dnode_get_string(args->dnode,
 						      "./gateway"));
 		nh = static_add_nexthop(rn, pn, info->safi, info->svrf, nh_type,
-					&ipaddr, ifname, nh_vrf);
+					&ipaddr, ifname, nh_vrf, 0);
 		if (!nh) {
 			char buf[SRCDEST2STR_BUFFER];
 
@@ -302,6 +302,26 @@ static int static_nexthop_onlink_modify(struct nb_cb_modify_args *args)
 	return NB_OK;
 }
 
+static int static_nexthop_color_modify(struct nb_cb_modify_args *args)
+{
+	struct static_nexthop *nh;
+
+	nh = nb_running_get_entry(args->dnode, NULL, true);
+	nh->color = yang_dnode_get_uint32(args->dnode, NULL);
+
+	return NB_OK;
+}
+
+static int static_nexthop_color_destroy(struct nb_cb_destroy_args *args)
+{
+	struct static_nexthop *nh;
+
+	nh = nb_running_unset_entry(args->dnode);
+	nh->color = 0;
+
+	return NB_OK;
+}
+
 static int static_nexthop_bh_type_modify(struct nb_cb_modify_args *args)
 {
 	struct static_nexthop *nh;
@@ -705,6 +725,44 @@ int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_pa
 	}
 	return NB_OK;
 }
+
+/*
+ * XPath:
+ * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/path-list/frr-nexthops/nexthop/srte-color
+ */
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_modify(
+	struct nb_cb_modify_args *args)
+{
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		if (static_nexthop_color_modify(args) != NB_OK)
+			return NB_ERR;
+
+		break;
+	}
+	return NB_OK;
+}
+
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_path_list_frr_nexthops_nexthop_color_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		if (static_nexthop_color_destroy(args) != NB_OK)
+			return NB_ERR;
+		break;
+	}
+	return NB_OK;
+}
+
 /*
  * XPath:
  * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/path-list/frr-nexthops/nexthop/mpls-label-stack/entry
@@ -1122,6 +1180,44 @@ int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_sr
 	return NB_OK;
 }
 
+/*
+ * XPath:
+ * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/src-list/path-list/frr-nexthops/nexthop/srte-color
+ */
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_modify(
+	struct nb_cb_modify_args *args)
+{
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		if (static_nexthop_color_modify(args) != NB_OK)
+			return NB_ERR;
+
+		break;
+	}
+	return NB_OK;
+}
+
+
+int routing_control_plane_protocols_control_plane_protocol_staticd_route_list_src_list_path_list_frr_nexthops_nexthop_color_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		if (static_nexthop_color_destroy(args) != NB_OK)
+			return NB_ERR;
+		break;
+	}
+	return NB_OK;
+}
+
 /*
  * XPath:
  * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-staticd:staticd/route-list/src-list/path-list/frr-nexthops/nexthop/mpls-label-stack/entry

staticd/static_routes.c

@@ -200,7 +200,7 @@ struct static_nexthop *
 static_add_nexthop(struct route_node *rn, struct static_path *pn, safi_t safi,
 		   struct static_vrf *svrf, static_types type,
 		   struct ipaddr *ipaddr, const char *ifname,
-		   const char *nh_vrf)
+		   const char *nh_vrf, uint32_t color)
 {
 	struct static_nexthop *nh;
 	struct static_vrf *nh_svrf;
@@ -218,6 +218,7 @@ static_add_nexthop(struct route_node *rn, struct static_path *pn, safi_t safi,
 	nh = XCALLOC(MTYPE_STATIC_NEXTHOP, sizeof(struct static_nexthop));
 
 	nh->type = type;
+	nh->color = color;
 
 	nh->nh_vrf_id = nh_svrf->vrf->vrf_id;
 	strlcpy(nh->nh_vrfname, nh_svrf->vrf->name, sizeof(nh->nh_vrfname));

staticd/static_routes.h

@@ -132,6 +132,9 @@ struct static_nexthop {
 	 * are specified.
 	 */
 	bool onlink;
+
+	/* SR-TE color */
+	uint32_t color;
 };
 
 DECLARE_DLIST(static_nexthop_list, struct static_nexthop, list);
@@ -156,7 +159,7 @@ extern struct static_nexthop *
 static_add_nexthop(struct route_node *rn, struct static_path *pn, safi_t safi,
 		   struct static_vrf *svrf, static_types type,
 		   struct ipaddr *ipaddr, const char *ifname,
-		   const char *nh_vrf);
+		   const char *nh_vrf, uint32_t color);
 extern void static_install_nexthop(struct route_node *rn,
 				   struct static_path *pn,
 				   struct static_nexthop *nh, safi_t safi,

staticd/static_vty.c

@@ -51,7 +51,8 @@ static int static_route_leak(struct vty *vty, const char *svrf,
 			     const char *gate_str, const char *ifname,
 			     const char *flag_str, const char *tag_str,
 			     const char *distance_str, const char *label_str,
-			     const char *table_str, bool onlink)
+			     const char *table_str, bool onlink,
+			     const char *color_str)
 {
 	int ret;
 	struct prefix p, src;
@@ -249,6 +250,16 @@ static int static_route_leak(struct vty *vty, const char *svrf,
 				nb_cli_enqueue_change(vty, ab_xpath,
 						      NB_OP_MODIFY, "false");
 		}
+		if (type == STATIC_IPV4_GATEWAY
+		    || type == STATIC_IPV6_GATEWAY
+		    || type == STATIC_IPV4_GATEWAY_IFNAME
+		    || type == STATIC_IPV6_GATEWAY_IFNAME) {
+			strlcpy(ab_xpath, xpath_nexthop, sizeof(ab_xpath));
+			strlcat(ab_xpath, FRR_STATIC_ROUTE_NH_COLOR_XPATH,
+				sizeof(ab_xpath));
+			nb_cli_enqueue_change(vty, ab_xpath, NB_OP_MODIFY,
+					      color_str);
+		}
 		if (label_str) {
 			/* copy of label string (start) */
 			char *ostr;
@@ -330,7 +341,7 @@ static int static_route(struct vty *vty, afi_t afi, safi_t safi,
 	return static_route_leak(vty, vrf_name, vrf_name, afi, safi, negate,
 				 dest_str, mask_str, src_str, gate_str, ifname,
 				 flag_str, tag_str, distance_str, label_str,
-				 table_str, false);
+				 table_str, false, NULL);
 }
 
 /* Write static route configuration. */
@@ -441,6 +452,12 @@ int static_config(struct vty *vty, struct static_vrf *svrf, afi_t afi,
 				if (nh->onlink)
 					vty_out(vty, " onlink");
 
+				/*
+				 * SR-TE color
+				 */
+				if (nh->color != 0)
+					vty_out(vty, " color %u", nh->color);
+
 				vty_out(vty, "\n");
 
 				write = 1;
@@ -550,7 +567,7 @@ DEFPY_YANG(ip_route_blackhole_vrf,
 	return static_route_leak(vty, vrfname, vrfname, AFI_IP, SAFI_UNICAST,
 				 no, prefix, mask_str, NULL, NULL, NULL, flag,
 				 tag_str, distance_str, label, table_str,
-				 false);
+				 false, NULL);
 }
 
 DEFPY_YANG(ip_route_address_interface,
@@ -567,6 +584,7 @@ DEFPY_YANG(ip_route_address_interface,
 	  |table (1-4294967295)                        \
 	  |nexthop-vrf NAME                            \
 	  |onlink$onlink                               \
+	  |color (1-4294967295)                        \
           }]",
       NO_STR IP_STR
       "Establish static routes\n"
@@ -584,7 +602,9 @@ DEFPY_YANG(ip_route_address_interface,
       "Table to configure\n"
       "The table number to configure\n"
       VRF_CMD_HELP_STR
-      "Treat the nexthop as directly attached to the interface\n")
+      "Treat the nexthop as directly attached to the interface\n"
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -604,7 +624,7 @@ DEFPY_YANG(ip_route_address_interface,
 	return static_route_leak(vty, vrf, nh_vrf, AFI_IP, SAFI_UNICAST, no,
 				 prefix, mask_str, NULL, gate_str, ifname, flag,
 				 tag_str, distance_str, label, table_str,
-				 !!onlink);
+				 !!onlink, color_str);
 }
 
 DEFPY_YANG(ip_route_address_interface_vrf,
@@ -620,7 +640,8 @@ DEFPY_YANG(ip_route_address_interface_vrf,
 	  |table (1-4294967295)                        \
 	  |nexthop-vrf NAME                            \
 	  |onlink$onlink                               \
-          }]",
+	  |color (1-4294967295)                        \
+	  }]",
       NO_STR IP_STR
       "Establish static routes\n"
       "IP destination prefix (e.g. 10.0.0.0/8)\n"
@@ -636,7 +657,9 @@ DEFPY_YANG(ip_route_address_interface_vrf,
       "Table to configure\n"
       "The table number to configure\n"
       VRF_CMD_HELP_STR
-      "Treat the nexthop as directly attached to the interface\n")
+      "Treat the nexthop as directly attached to the interface\n"
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -663,7 +686,7 @@ DEFPY_YANG(ip_route_address_interface_vrf,
 	return static_route_leak(vty, vrfname, nh_vrf, AFI_IP, SAFI_UNICAST, no,
 				 prefix, mask_str, NULL, gate_str, ifname, flag,
 				 tag_str, distance_str, label, table_str,
-				 !!onlink);
+				 !!onlink, color_str);
 }
 
 DEFPY_YANG(ip_route,
@@ -678,6 +701,7 @@ DEFPY_YANG(ip_route,
 	  |label WORD                                  \
 	  |table (1-4294967295)                        \
 	  |nexthop-vrf NAME                            \
+	  |color (1-4294967295)                        \
           }]",
       NO_STR IP_STR
       "Establish static routes\n"
@@ -694,7 +718,9 @@ DEFPY_YANG(ip_route,
       MPLS_LABEL_HELPSTR
       "Table to configure\n"
       "The table number to configure\n"
-      VRF_CMD_HELP_STR)
+      VRF_CMD_HELP_STR
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -715,7 +741,7 @@ DEFPY_YANG(ip_route,
 	return static_route_leak(vty, vrf, nh_vrf, AFI_IP, SAFI_UNICAST, no,
 				 prefix, mask_str, NULL, gate_str, ifname, flag,
 				 tag_str, distance_str, label, table_str,
-				 false);
+				 false, color_str);
 }
 
 DEFPY_YANG(ip_route_vrf,
@@ -729,6 +755,7 @@ DEFPY_YANG(ip_route_vrf,
 	  |label WORD                                  \
 	  |table (1-4294967295)                        \
 	  |nexthop-vrf NAME                            \
+	  |color (1-4294967295)                        \
           }]",
       NO_STR IP_STR
       "Establish static routes\n"
@@ -744,7 +771,9 @@ DEFPY_YANG(ip_route_vrf,
       MPLS_LABEL_HELPSTR
       "Table to configure\n"
       "The table number to configure\n"
-      VRF_CMD_HELP_STR)
+      VRF_CMD_HELP_STR
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -772,7 +801,7 @@ DEFPY_YANG(ip_route_vrf,
 	return static_route_leak(vty, vrfname, nh_vrf, AFI_IP, SAFI_UNICAST, no,
 				 prefix, mask_str, NULL, gate_str, ifname, flag,
 				 tag_str, distance_str, label, table_str,
-				 false);
+				 false, color_str);
 }
 
 DEFPY_YANG(ipv6_route_blackhole,
@@ -859,7 +888,7 @@ DEFPY_YANG(ipv6_route_blackhole_vrf,
 	return static_route_leak(vty, vrfname, vrfname, AFI_IP6, SAFI_UNICAST,
 				 no, prefix_str, NULL, from_str, NULL, NULL,
 				 flag, tag_str, distance_str, label, table_str,
-				 false);
+				 false, NULL);
 }
 
 DEFPY_YANG(ipv6_route_address_interface,
@@ -875,6 +904,7 @@ DEFPY_YANG(ipv6_route_address_interface,
 	    |table (1-4294967295)                          \
             |nexthop-vrf NAME                              \
 	    |onlink$onlink                                 \
+	    |color (1-4294967295)                          \
           }]",
       NO_STR
       IPV6_STR
@@ -893,7 +923,9 @@ DEFPY_YANG(ipv6_route_address_interface,
       "Table to configure\n"
       "The table number to configure\n"
       VRF_CMD_HELP_STR
-      "Treat the nexthop as directly attached to the interface\n")
+      "Treat the nexthop as directly attached to the interface\n"
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -914,7 +946,7 @@ DEFPY_YANG(ipv6_route_address_interface,
 	return static_route_leak(vty, vrf, nh_vrf, AFI_IP6, SAFI_UNICAST, no,
 				 prefix_str, NULL, from_str, gate_str, ifname,
 				 flag, tag_str, distance_str, label, table_str,
-				 !!onlink);
+				 !!onlink, color_str);
 }
 
 DEFPY_YANG(ipv6_route_address_interface_vrf,
@@ -929,6 +961,7 @@ DEFPY_YANG(ipv6_route_address_interface_vrf,
 	    |table (1-4294967295)                          \
             |nexthop-vrf NAME                              \
 	    |onlink$onlink                                 \
+	    |color (1-4294967295)                          \
           }]",
       NO_STR
       IPV6_STR
@@ -946,7 +979,9 @@ DEFPY_YANG(ipv6_route_address_interface_vrf,
       "Table to configure\n"
       "The table number to configure\n"
       VRF_CMD_HELP_STR
-      "Treat the nexthop as directly attached to the interface\n")
+      "Treat the nexthop as directly attached to the interface\n"
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -973,7 +1008,7 @@ DEFPY_YANG(ipv6_route_address_interface_vrf,
 	return static_route_leak(vty, vrfname, nh_vrf, AFI_IP6, SAFI_UNICAST,
 				 no, prefix_str, NULL, from_str, gate_str,
 				 ifname, flag, tag_str, distance_str, label,
-				 table_str, !!onlink);
+				 table_str, !!onlink, color_str);
 }
 
 DEFPY_YANG(ipv6_route,
@@ -987,6 +1022,7 @@ DEFPY_YANG(ipv6_route,
             |label WORD                                    \
 	    |table (1-4294967295)                          \
             |nexthop-vrf NAME                              \
+            |color (1-4294967295)                          \
           }]",
       NO_STR
       IPV6_STR
@@ -1004,7 +1040,9 @@ DEFPY_YANG(ipv6_route,
       MPLS_LABEL_HELPSTR
       "Table to configure\n"
       "The table number to configure\n"
-      VRF_CMD_HELP_STR)
+      VRF_CMD_HELP_STR
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -1024,7 +1062,7 @@ DEFPY_YANG(ipv6_route,
 	return static_route_leak(vty, vrf, nh_vrf, AFI_IP6, SAFI_UNICAST, no,
 				 prefix_str, NULL, from_str, gate_str, ifname,
 				 flag, tag_str, distance_str, label, table_str,
-				 false);
+				 false, color_str);
 }
 
 DEFPY_YANG(ipv6_route_vrf,
@@ -1037,6 +1075,7 @@ DEFPY_YANG(ipv6_route_vrf,
             |label WORD                                    \
 	    |table (1-4294967295)                          \
             |nexthop-vrf NAME                              \
+	    |color (1-4294967295)                          \
           }]",
       NO_STR
       IPV6_STR
@@ -1053,7 +1092,9 @@ DEFPY_YANG(ipv6_route_vrf,
       MPLS_LABEL_HELPSTR
       "Table to configure\n"
       "The table number to configure\n"
-      VRF_CMD_HELP_STR)
+      VRF_CMD_HELP_STR
+      "SR-TE color\n"
+      "The SR-TE color to configure\n")
 {
 	const char *nh_vrf;
 	const char *flag = NULL;
@@ -1080,7 +1121,7 @@ DEFPY_YANG(ipv6_route_vrf,
 	return static_route_leak(vty, vrfname, nh_vrf, AFI_IP6, SAFI_UNICAST,
 				 no, prefix_str, NULL, from_str, gate_str,
 				 ifname, flag, tag_str, distance_str, label,
-				 table_str, false);
+				 table_str, false, color_str);
 }
 DEFPY_YANG(debug_staticd,
       debug_staticd_cmd,

staticd/static_zebra.c

@@ -431,6 +431,10 @@ extern void static_zebra_route_add(struct route_node *rn,
 		api_nh->vrf_id = nh->nh_vrf_id;
 		if (nh->onlink)
 			SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
+		if (nh->color != 0) {
+			SET_FLAG(api.message, ZAPI_MESSAGE_SRTE);
+			api_nh->srte_color = nh->color;
+		}
 
 		nh->state = STATIC_SENT_TO_ZEBRA;
 

yang/frr-nexthop.yang

@@ -188,6 +188,16 @@ module frr-nexthop {
         "Nexthop is directly connected.";
     }
 
+    leaf srte-color {
+      when "../nh-type = 'ip4' or
+            ../nh-type = 'ip6' or
+            ../nh-type = 'ip4-ifindex' or
+            ../nh-type = 'ip6-ifindex'";
+      type uint32;
+      description
+        "The nexthop SR-TE color";
+    }
+
     uses rt-types:mpls-label-stack {
       description
         "Nexthop's MPLS label stack.";

zebra/zebra_nb.c

@@ -552,6 +552,12 @@ const struct frr_yang_module_info frr_zebra_info = {
 				.get_elem = lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_onlink_get_elem,
 			}
 		},
+		{
+			.xpath = "/frr-vrf:lib/vrf/frr-zebra:zebra/ribs/rib/route/route-entry/nexthop-group/nexthop/srte-color",
+			.cbs = {
+				.get_elem = lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_color_get_elem,
+			}
+		},
 		{
 			.xpath = "/frr-vrf:lib/vrf/frr-zebra:zebra/ribs/rib/route/route-entry/nexthop-group/nexthop/mpls-label-stack/entry",
 			.cbs = {

zebra/zebra_nb.h

@@ -275,6 +275,9 @@ lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_bh_type_get_elem(
 struct yang_data *
 lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_onlink_get_elem(
 	struct nb_cb_get_elem_args *args);
+struct yang_data *
+lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_color_get_elem(
+	struct nb_cb_get_elem_args *args);
 const void *
 lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_mpls_label_stack_entry_get_next(
 	struct nb_cb_get_next_args *args);

zebra/zebra_nb_state.c

@@ -806,6 +806,22 @@ lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_onlink_get_elem(
 	return NULL;
 }
 
+/*
+ * XPath:
+ * /frr-vrf:lib/vrf/frr-zebra:zebra/ribs/rib/route/route-entry/nexthop-group/nexthop/srte-color
+ */
+struct yang_data *
+lib_vrf_zebra_ribs_rib_route_route_entry_nexthop_group_nexthop_color_get_elem(
+	struct nb_cb_get_elem_args *args)
+{
+	struct nexthop *nexthop = (struct nexthop *)args->list_entry;
+
+	if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_SRTE))
+		return yang_data_new_uint32(args->xpath, nexthop->srte_color);
+
+	return NULL;
+}
+
 /*
  * XPath:
  * /frr-vrf:lib/vrf/frr-zebra:zebra/ribs/rib/route/route-entry/nexthop-group/nexthop/mpls-label-stack/entry