BGP: Add support for peering with link-local IPv6 addresses

[Ondrej Zajicek]

On Sun, Dec 19, 2010 at 09:55:24AM +0100, Matthias Schiffer wrote:
> Hi,
> the attached patch adds support for using link-local v6 addresses for
> BGP peerings by adding an interface attribute to the BGP protocol.
> It has been succesfully tested in a Bird<->Quagga configuration on
> Linux, and with Bird<->Bird using Linux<->Linux and Linux<->FreeBSD.
> 
> I know the BGP RFCs (especially 2545) are a bit unclear if this should
> be allowed, but RFC 4659 suggests it should, and also describes how to
> set the NEXT_HOP attribute when no global addresses are used.
> 
> Anyways, I'd love to see this patch included in Bird. It shouldn't make
> any difference when you don't use the interface attribute, so it won't have
> bad influence on people not using this feature, and it makes Bird an
> alternative to Quagga when you need link-local peering support. :-)

Thanks, i will merge that.

> diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c
> index 53b30ca..fc73be8 100644
> --- a/sysdep/bsd/krt-sock.c
> +++ b/sysdep/bsd/krt-sock.c
> @@ -541,7 +541,7 @@ krt_read_addr(struct ks_msg *msg)
>      _I0(ifa.ip) = 0xfe800000;
>  #endif
>  
> -  if (iface->flags & IF_MULTIACCESS)
> +  if ((iface->flags & IF_MULTIACCESS) || ipa_has_link_scope(ifa.ip))
>    {
>      ifa.prefix = ipa_and(ifa.ip, ipa_mkmask(masklen));
>  

What is exactly that? Link-local addresses are broken (in BIRD)
on non-multiaccess devices on *BSD?

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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