From 6d1e2a62bdb4f6353e3a9006f2d603031f4648e6 Mon Sep 17 00:00:00 2001
From: Hangbin Liu <liuhangbin@gmail.com>
Date: Mon, 9 Oct 2017 22:31:43 +0800
Subject: [PATCH] rtnl: add function rtnl_get_ts_label to get interface
 ts_label info

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 rtnl.c | 31 +++++++++++++++++++++++++++++++
 rtnl.h |  9 +++++++++
 2 files changed, 40 insertions(+)

diff --git a/rtnl.c b/rtnl.c
index 3419873..cea936b 100644
--- a/rtnl.c
+++ b/rtnl.c
@@ -43,6 +43,37 @@ int rtnl_close(int fd)
 	return close(fd);
 }
 
+static void rtnl_get_ts_label_callback(void *ctx, int linkup, int ts_index)
+{
+	int *dst = ctx;
+	*dst = ts_index;
+}
+
+int rtnl_get_ts_label(struct interface *iface)
+{
+	int err, fd;
+	int ts_index = -1;
+
+	fd = rtnl_open();
+	if (fd < 0)
+		return fd;
+
+	err = rtnl_link_query(fd, iface->name);
+	if (err) {
+		goto no_info;
+	}
+
+	rtnl_link_status(fd, iface->name, rtnl_get_ts_label_callback, &ts_index);
+	if (ts_index > 0 && if_indextoname(ts_index, iface->ts_label))
+		err = 0;
+	else
+		err = -1;
+
+no_info:
+	rtnl_close(fd);
+	return err;
+}
+
 int rtnl_link_query(int fd, char *device)
 {
 	struct sockaddr_nl sa;
diff --git a/rtnl.h b/rtnl.h
index 6eced2d..2906d74 100644
--- a/rtnl.h
+++ b/rtnl.h
@@ -20,6 +20,8 @@
 #ifndef HAVE_RTNL_H
 #define HAVE_RTNL_H
 
+#include "config.h"
+
 typedef void (*rtnl_callback)(void *ctx, int linkup, int ts_index);
 
 /**
@@ -29,6 +31,13 @@ typedef void (*rtnl_callback)(void *ctx, int linkup, int ts_index);
  */
 int rtnl_close(int fd);
 
+/**
+ * Get interface ts_label information
+ * @param iface  struct interface.
+ * @return       Zero on success, or -1 on error.
+ */
+int rtnl_get_ts_label(struct interface *iface);
+
 /**
  * Request the link status from the kernel.
  * @param fd     A socket obtained via rtnl_open().