Re: We are violating RFC1884 and RFC2373

[Hal Snyder <hal_(_at_)_vailsys_(_dot_)_com>]

Henning Brauer <lists-openbsdtech_(_at_)_bsws_(_dot_)_de> writes:

> The RFCs 1884 (standard) and its successor 2373 (proposed standard)
> are defining a method to bind to IPv4 adresses like
> ::ffff:127.0.0.1. This is not possible on OpenBSD and NetBSD:
> 
>    517 tcpserver6 CALL  bind(0x3,0xdfbfdaa0,0x1c)
>    517 tcpserver6 RET   bind -1 errno 49 Can't assign requested address
> 
> So, the IPv4-in-IPv6 adresses as defined in RFC1884 don't work on
> OpenBSD. This makes porting IPv6-applications hard, makes the
> application code more complex if a workaround is introduced and is
> simply against the RFCs. Saying "supporting IPv4-in-IPv6-addresses
> makes the code more complex" is not valid here as it simply moves
> the complexity to the application. This problem is imported from
> KAME and present in OpenBSD and NetBSD. I don't know about FreeBSD.

Maybe you've seen the Kame notes at

  http://orange.kame.net/dev/cvsweb.cgi/kame/IMPLEMENTATION

or in OpenBSD's

  /usr/src/sys/netinet6/IMPLEMENTATION

particularly the table at section 1.12 and OpenBSD section 1.12.5,
citing "security reasons". Optional in recent NetBSD and FreeBSD, not
supported in OpenBSD.