1 files changed, 29 insertions, 0 deletions
diff --git a/lib/net_utils.c b/lib/net_utils.c
new file mode 100644
index 0000000000..42bb0473fb
--- /dev/null
+++ b/lib/net_utils.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/string.h>
+#include <linux/if_ether.h>
+#include <linux/ctype.h>
+#include <linux/export.h>
+#include <linux/hex.h>
+
+bool mac_pton(const char *s, u8 *mac)
+{
+	size_t maxlen = 3 * ETH_ALEN - 1;
+	int i;
+
+	/* XX:XX:XX:XX:XX:XX */
+	if (strnlen(s, maxlen) < maxlen)
+		return false;
+
+	/* Don't dirty result unless string is valid MAC. */
+	for (i = 0; i < ETH_ALEN; i++) {
+		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
+			return false;
+		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
+			return false;
+	}
+	for (i = 0; i < ETH_ALEN; i++) {
+		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
+	}
+	return true;
+}
+EXPORT_SYMBOL(mac_pton);