From fade5d5461b0379b27ca96faf560d855d7a0ea8b Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Fri, 29 Sep 2006 01:58:53 -0700 Subject: [PATCH] [PATCH] uml: don't roll my own random MAC generator Use the existing random_ether_addr() instead of cooking up my own version. Pointed out by Dave Hollis and Jason Lunz. Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/drivers/net_kern.c | 4 +--- arch/um/drivers/net_user.c | 29 ----------------------------- arch/um/include/net_user.h | 2 -- 3 files changed, 1 insertion(+), 34 deletions(-) diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index c067abbbfd..16aa572325 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -310,9 +310,7 @@ static void setup_etheraddr(char *str, unsigned char *addr) return; random: - addr[0] = 0xfe; - addr[1] = 0xfd; - random_mac(addr); + random_ether_addr(addr) } static DEFINE_SPINLOCK(devices_lock); diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c index 142bcb2c7c..f3a3f8a29c 100644 --- a/arch/um/drivers/net_user.c +++ b/arch/um/drivers/net_user.c @@ -259,32 +259,3 @@ char *split_if_spec(char *str, ...) va_end(ap); return str; } - -void random_mac(unsigned char *addr) -{ - struct timeval tv; - long n; - unsigned int seed; - - gettimeofday(&tv, NULL); - - /* Assume that 20 bits of microseconds and 12 bits of the pid are - * reasonably unpredictable. - */ - seed = tv.tv_usec | (os_getpid() << 20); - srandom(seed); - - /* Don't care about endianness here - switching endianness - * just rearranges what are hopefully random numbers. - * - * Assume that RAND_MAX > 65536, so random is called twice and - * we use 16 bits of the result. - */ - n = random(); - addr[2] = (n >> 8) & 255; - addr[3] = n % 255; - - n = random(); - addr[4] = (n >> 8) & 255; - addr[5] = n % 255; -} diff --git a/arch/um/include/net_user.h b/arch/um/include/net_user.h index 99b3cea2dc..19f207cd70 100644 --- a/arch/um/include/net_user.h +++ b/arch/um/include/net_user.h @@ -50,6 +50,4 @@ extern char *split_if_spec(char *str, ...); extern int dev_netmask(void *d, void *m); -extern void random_mac(unsigned char *addr); - #endif -- 2.39.5