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ether_fakeaddr: Use 'b' 's' 'd' for the prefix

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This has the advantage of being obvious to sniff out the designated prefix
by eye and it has all the right bits set. Comment stolen from ffec.

I've removed bryanv@'s pending question of using the FreeBSD OUI range --
no one has followed up on this with a definitive action, and there's no
particular reason to shoot for it and the administrative overhead that comes
with deciding exactly how to use it.
This commit is contained in:
kevans 2019-03-14 19:48:43 +00:00
parent df0eda7afd
commit e7a77f591f
1 changed files with 6 additions and 5 deletions
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11
sys/net/if_ethersubr.c
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@ -1406,13 +1406,14 @@ ether_fakeaddr(struct ether_addr *hwaddr)
{
/*
* Generate a non-multicast, locally administered address.
*
* BMV: Should we use the FreeBSD OUI range instead?
* Generate a convenient locally administered address,
* 'bsd' + random 24 low-order bits. 'b' is 0x62, which has the locally
* assigned bit set, and the broadcast/multicast bit clear.
*/
arc4rand(hwaddr->octet, ETHER_ADDR_LEN, 1);
hwaddr->octet[0] &= ~1;
hwaddr->octet[0] |= 2;
hwaddr->octet[0] = 'b';
hwaddr->octet[1] = 's';
hwaddr->octet[2] = 'd';
}
DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);