Re: [PATCH iproute2-next v2 1/3] Add, show, link, remove IOAM namespaces and schemas

+static void print_schema(struct rtattr *attrs[])
+{
+	__u8 data[IOAM6_MAX_SCHEMA_DATA_LEN + 1];
+	int len;
+
+	print_uint(PRINT_ANY, "schema", "schema %u",
+		   rta_getattr_u32(attrs[IOAM6_ATTR_SC_ID]));
+
+	if (attrs[IOAM6_ATTR_NS_ID])
+		print_uint(PRINT_ANY, "namespace", " [namespace %u]",
+			   rta_getattr_u16(attrs[IOAM6_ATTR_NS_ID]));
+
+	len = RTA_PAYLOAD(attrs[IOAM6_ATTR_SC_DATA]);
+	memcpy(data, RTA_DATA(attrs[IOAM6_ATTR_SC_DATA]), len);
+	data[len] = '\0';
+
+	print_string(PRINT_ANY, "data", ", data \"%s\"", (const char *)data);

+	print_null(PRINT_ANY, "", "\n", NULL);
+}
+
+static int process_msg(struct nlmsghdr *n, void *arg)
+{
+	struct rtattr *attrs[IOAM6_ATTR_MAX + 1];
+	struct genlmsghdr *ghdr;
+	int len = n->nlmsg_len;
+
+	if (n->nlmsg_type != genl_family)
+		return -1;
+
+	len -= NLMSG_LENGTH(GENL_HDRLEN);
+	if (len < 0)
+		return -1;
+
+	ghdr = NLMSG_DATA(n);
+	parse_rtattr(attrs, IOAM6_ATTR_MAX, (void *)ghdr + GENL_HDRLEN, len);
+
+	open_json_object(NULL);
+	switch (ghdr->cmd) {
+	case IOAM6_CMD_DUMP_NAMESPACES:
+		print_namespace(attrs);
+		break;
+	case IOAM6_CMD_DUMP_SCHEMAS:
+		print_schema(attrs);
+		break;
+	}
+	close_json_object();
+
+	return 0;
+}
+
+static int ioam6_do_cmd(void)
+{
+	IOAM6_REQUEST(req, 1036, opts.cmd, NLM_F_REQUEST);
+	int dump = 0;
+
+	if (genl_family < 0) {
+		if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) {
+			fprintf(stderr, "Cannot open generic netlink socket\n");
+			exit(1);
+		}
+		genl_family = genl_resolve_family(&grth, IOAM6_GENL_NAME);

+		if (genl_family < 0)
+			exit(1);
+		req.n.nlmsg_type = genl_family;
+	}
+

+int do_ioam6(int argc, char **argv)
+{
+	bool maybe_wide = false;
+
+	if (argc < 1 || matches(*argv, "help") == 0)
+		usage();
+
+	memset(&opts, 0, sizeof(opts));
+
+	if (matches(*argv, "namespace") == 0) {