[iproute2] Bareudp device support

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index d36919f..a3a876d 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -578,6 +578,18 @@  enum ifla_geneve_df {
 	GENEVE_DF_MAX = __GENEVE_DF_END - 1,
 };
 
+/* Bareudp section  */
+enum {
+	IFLA_BAREUDP_UNSPEC,
+	IFLA_BAREUDP_PORT,
+	IFLA_BAREUDP_ETHERTYPE,
+	IFLA_BAREUDP_SRCPORT_MIN,
+	IFLA_BAREUDP_EXTMODE,
+	__IFLA_BAREUDP_MAX
+};
+
+#define IFLA_BAREUDP_MAX (__IFLA_BAREUDP_MAX - 1)
+
 /* PPP section */
 enum {
 	IFLA_PPP_UNSPEC,
diff --git a/ip/Makefile b/ip/Makefile
index 5ab78d7..784d852 100644
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -11,7 +11,7 @@  IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
     iplink_bridge.o iplink_bridge_slave.o ipfou.o iplink_ipvlan.o \
     iplink_geneve.o iplink_vrf.o iproute_lwtunnel.o ipmacsec.o ipila.o \
     ipvrf.o iplink_xstats.o ipseg6.o iplink_netdevsim.o iplink_rmnet.o \
-    ipnexthop.o
+    ipnexthop.o iplink_bareudp.o
 
 RTMONOBJ=rtmon.o
 
diff --git a/ip/iplink_bareudp.c b/ip/iplink_bareudp.c
new file mode 100644
index 0000000..479ad1c
--- /dev/null
+++ b/ip/iplink_bareudp.c
@@ -0,0 +1,154 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <stdio.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+#define BAREUDP_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
+
+static void print_explain(FILE *f)
+{
+	fprintf(f,
+			"Usage: ........ bareudp dstport PORT\n"
+			"                ethertype ETHERTYPE|PROTOCOL\n"
+			"                [ext_mode]\n"
+			"                [srcportmin SRCPORTMIN]\n"
+			"\n"
+			"Where: PORT   := 0-65535\n"
+			"     : ETHERTYPE|PROTOCOL := ip|mpls|0-65535\n"
+			"     : SRCPORTMIN : = 0-65535\n"
+	       );
+}
+
+static void explain(void)
+{
+	print_explain(stderr);
+}
+
+static void check_duparg(__u64 *attrs, int type, const char *key,
+		const char *argv)
+{
+	if (!BAREUDP_ATTRSET(*attrs, type)) {
+		*attrs |= (1L << type);
+		return;
+	}
+	duparg2(key, argv);
+}
+
+static int bareudp_parse_opt(struct link_util *lu, int argc, char **argv,
+		struct nlmsghdr *n)
+{
+	__u16 dstport = 0;
+	__u16 ethertype = 0;
+	__u16 srcportmin = 0;
+	bool extmode = 0;
+	__u64 attrs = 0;
+
+	while (argc > 0) {
+		if (!matches(*argv, "dstport")) {
+			NEXT_ARG();
+			check_duparg(&attrs, IFLA_BAREUDP_PORT, "dstport",
+					*argv);
+			if (get_u16(&dstport, *argv, 0))
+				invarg("dstport", *argv);
+		} else if (!matches(*argv, "extmode")) {
+			check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+					*argv, *argv);
+			extmode = true;
+		} else if (!matches(*argv, "ethertype"))  {
+			NEXT_ARG();
+			check_duparg(&attrs, IFLA_BAREUDP_ETHERTYPE,
+					*argv, *argv);
+			if (!matches(*argv, "mpls")) {
+				ethertype = 0x8847;
+				check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+						*argv, *argv);
+				extmode = true;
+			} else if (!matches(*argv, "ip")) {
+				ethertype = 0x0800;
+				check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+						*argv, *argv);
+				extmode = true;
+			} else {
+				if (get_u16(&ethertype, *argv, 0))
+					invarg("ethertype", *argv);
+			}
+		} else if (!matches(*argv, "srcportmin")) {
+			NEXT_ARG();
+			check_duparg(&attrs, IFLA_BAREUDP_SRCPORT_MIN,
+					*argv, *argv);
+			if (get_u16(&srcportmin, *argv, 0))
+				invarg("srcportmin", *argv);
+
+		} else if (matches(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "bareudp: unknown command \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+	argc--, argv++;
+	}
+
+	if (!dstport || !ethertype)  {
+		fprintf(stderr, "bareudp : Missing mandatory params\n");
+		return -1;
+	}
+
+	if (dstport)
+		addattr16(n, 1024, IFLA_BAREUDP_PORT, htons(dstport));
+	if (ethertype)
+		addattr16(n, 1024, IFLA_BAREUDP_ETHERTYPE, htons(ethertype));
+	if (extmode)
+		addattr(n, 1024, IFLA_BAREUDP_EXTMODE);
+	if (srcportmin)
+		addattr16(n, 1024, IFLA_BAREUDP_PORT, srcportmin);
+
+	return 0;
+}
+
+static void bareudp_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+
+	if (!tb)
+		return;
+
+	if (tb[IFLA_BAREUDP_PORT])
+		print_uint(PRINT_ANY,
+				"port",
+				"dstport %u ",
+				rta_getattr_be16(tb[IFLA_BAREUDP_PORT]));
+
+	if (tb[IFLA_BAREUDP_ETHERTYPE])
+		print_uint(PRINT_ANY,
+				"port",
+				"dstport %u ",
+				rta_getattr_be16(tb[IFLA_BAREUDP_ETHERTYPE]));
+	if (tb[IFLA_BAREUDP_SRCPORT_MIN])
+		print_uint(PRINT_ANY,
+				"port",
+				"dstport %u ",
+				rta_getattr_u16(tb[IFLA_BAREUDP_SRCPORT_MIN]));
+
+	if (tb[IFLA_BAREUDP_EXTMODE]) {
+		print_bool(PRINT_ANY, "extmode", "extmode ", true);
+		return;
+	}
+}
+
+static void bareudp_print_help(struct link_util *lu, int argc, char **argv,
+		FILE *f)
+{
+	print_explain(f);
+}
+
+struct link_util bareudp_link_util = {
+	.id		= "bareudp",
+	.maxattr	= IFLA_BAREUDP_MAX,
+	.parse_opt	= bareudp_parse_opt,
+	.print_opt	= bareudp_print_opt,
+	.print_help	= bareudp_print_help,
+};