ioctl: SIOCADDMULTI (howto?)

[Bruce M. Simpson]

Jouke Witteveen wrote:
>
> I hope someone can find a spare minute to look at if_findmulti. It
> would help me quite much.
I verified with mtest that FreeBSD cannot delete an AF_LINK multicast 
membership, reproduced with both 7-CURRENT and 6.2-RELEASE.

if_findmulti() appears to be doing a possibly incorrect comparison.
sa_equal() is not valid for use with AF_LINK in some cases, as 
sockaddr_dl has deeper structure than a simple array of bytes.

Thanks for finding this bug -- it would have affected XORP's IS-IS 
implementation further on in time.

Further testing would be appreciated. If the fix is good I will merge, 
though it should perhaps be a more general fix for sa_equal().

BMS
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