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Add helper function for generating random MAC addresses with same OUI

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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>
This commit is contained in:
Jouni Malinen 2014-09-29 23:23:11 +03:00
parent c1d1b6998d
commit 1cbdb9d137
2 changed files with 11 additions and 0 deletions
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10
src/utils/common.c
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@ -856,3 +856,13 @@ int random_mac_addr(u8 *addr)
addr[0] |= 0x02; /* locally administered */ addr[0] |= 0x02; /* locally administered */
return 0; 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;
}

1
src/utils/common.h
View file

@ -539,6 +539,7 @@ void str_clear_free(char *str);
void bin_clear_free(void *bin, size_t len); void bin_clear_free(void *bin, size_t len);
int random_mac_addr(u8 *addr); int random_mac_addr(u8 *addr);
int random_mac_addr_keep_oui(u8 *addr);
/* /*