From: Jouni Malinen <j@w1.fi>
Date: Mon, 29 Sep 2014 20:23:11 +0000 (+0300)
Subject: Add helper function for generating random MAC addresses with same OUI
X-Git-Tag: hostap_2_3~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1cbdb9d13754e1476620f5a3938b726270821adb;p=thirdparty%2Fhostap.git

Add helper function for generating random MAC addresses with same OUI

random_mac_addr_keep_oui() is similar to random_mac_addr(), but it
maintains the OUI part of the source address.

Signed-off-by: Jouni Malinen <j@w1.fi>
---

diff --git a/src/utils/common.c b/src/utils/common.c
index 78d196e9c..990200491 100644
--- a/src/utils/common.c
+++ b/src/utils/common.c
@@ -856,3 +856,13 @@ int random_mac_addr(u8 *addr)
 	addr[0] |= 0x02; /* locally administered */
 	return 0;
 }
+
+
+int random_mac_addr_keep_oui(u8 *addr)
+{
+	if (os_get_random(addr + 3, 3) < 0)
+		return -1;
+	addr[0] &= 0xfe; /* unicast */
+	addr[0] |= 0x02; /* locally administered */
+	return 0;
+}
diff --git a/src/utils/common.h b/src/utils/common.h
index 1a191d206..14d9ad1e9 100644
--- a/src/utils/common.h
+++ b/src/utils/common.h
@@ -539,6 +539,7 @@ void str_clear_free(char *str);
 void bin_clear_free(void *bin, size_t len);
 
 int random_mac_addr(u8 *addr);
+int random_mac_addr_keep_oui(u8 *addr);
 
 
 /*