X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/0cd29d29174b83e6e700efbe77624eb1dabb8094..10bdeb0c44eb4a997645ebdc15376fb36f9d3ae2:/util.c

diff --git a/util.c b/util.c
index 784b09b7..a2ef36d7 100644
--- a/util.c
+++ b/util.c
@@ -415,7 +415,7 @@ tok2strary_internal(register const char **lp, int n, register const char *fmt,
  */
 
 int
-mask2plen (u_int32_t mask)
+mask2plen(u_int32_t mask)
 {
 	u_int32_t bitmasks[33] = {
 		0x00000000,
@@ -439,6 +439,35 @@ mask2plen (u_int32_t mask)
 	return (prefix_len);
 }
 
+#ifdef INET6
+int
+mask62plen(const u_char *mask)
+{
+	u_char bitmasks[9] = {
+		0x00,
+		0x80, 0xc0, 0xe0, 0xf0,
+		0xf8, 0xfc, 0xfe, 0xff
+	};
+	int byte;
+	int cidr_len = 0;
+
+	for (byte = 0; byte < 16; byte++) {
+		u_int bits;
+
+		for (bits = 0; bits < (sizeof (bitmasks) / sizeof (bitmasks[0])); bits++) {
+			if (mask[byte] == bitmasks[bits]) {
+				cidr_len += bits;
+				break;
+			}
+		}
+
+		if (mask[byte] != 0xff)
+			break;
+	}
+	return (cidr_len);
+}
+#endif /* INET6 */
+
 /* VARARGS */
 void
 error(const char *fmt, ...)