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net: make net_random_ethaddr() more random

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The net_random_ethaddr() tries to get some entropy from different
startup times of a board. The seed is initialized with get_timer() which
has only a granularity of milliseconds. We can do better if we use
get_ticks() which returns the raw timer ticks. Using this we have a
higher chance of getting different values at startup.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Michael Walle 2019-08-27 10:13:52 +02:00 committed by Joe Hershberger
parent 5ccd657b6d
commit 12c2a310e8
1 changed files with 1 additions and 1 deletions
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2
include/net.h
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@ -816,7 +816,7 @@ static inline int is_valid_ethaddr(const u8 *addr)
static inline void net_random_ethaddr(uchar *addr)
{
int i;
unsigned int seed = get_timer(0);
unsigned int seed = get_ticks();
for (i = 0; i < 6; i++)
addr[i] = rand_r(&seed);