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Re: [v6ops] IPv6 link-local and URLs @ IETF119

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 19 March 2024 18:54 UTC

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Date: Wed, 20 Mar 2024 07:53:56 +1300
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To: Lorenzo Colitti <lorenzo@google.com>
Cc: George Michaelson <ggm@algebras.org>, "v6ops@ietf.org WG" <v6ops@ietf.org>, Toerless Eckert <tte@cs.fau.de>, "Murray S. Kucherawy" <superuser@gmail.com>
References: <ZfjN-XGXZ599sxK3@faui48e.informatik.uni-erlangen.de> <CAL0qLwZfRt1o4o3Z0zC+XfO1U_=uGznpmqSaDrKjf06HXAYm5w@mail.gmail.com> <CAL0qLwZ2WELSG868Hcc=dYH_zcm+ecEbavt8Oq7GSTT8st0hWg@mail.gmail.com> <e9387f40-408a-15fb-3f2c-afaa05c5a7ce@gmail.com> <CAKD1Yr09GvBdHFqPAujGaJ-j4cLYX2yMLhMDB4b_GfEM-1SNYw@mail.gmail.com> <CAKr6gn3ektAdcMz2g230S3UZKoyMohc_3_t9Xi1QtAcDem3P1Q@mail.gmail.com> <bc63fd8e-4a04-535d-977d-cd102ae0fbae@gmail.com> <CAKD1Yr3hQOKYZ0JwOXf6z8d9r4cwggmUXApLWwdgCyNG9XYWVw@mail.gmail.com> <dd8b103c-33ad-962e-f26f-40bc89175a96@gmail.com> <CAKD1Yr0GLA0ufT8F10iDQNx0NsdDjMz17X3Q1HR9VuBJU_EvcA@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [v6ops] IPv6 link-local and URLs @ IETF119
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(Resending with Reply All)

On 19-Mar-24 21:57, Lorenzo Colitti wrote:
> On Tue, Mar 19, 2024 at 6:11 PM Brian E Carpenter <brian.e.carpenter@gmail.com <mailto:brian.e.carpenter@gmail.com>> wrote:
> 
>      > How can there be no such thing? If an app connects to a global address, the stack must pick an interface. So such a concept must exist.
> 
>     RFC4007 says that an implementation MAY have a default interface for link locals when the user doesn't supply one via fe80::1%name. Linux doesn't do that. Since link-locals aren't routeable, you just get 'invalid argument' from sendmsg()  if you don't supply a valid interface number.
> 
> 
> It's pretty trivial for a browser to do this though: whenever it converts a link-local address from a URL to its internal data structures, determine the system default network and use that to populate the scope ID.

Except that
(a) No browser does that (it works on Windows because the network stack does it).
(b) afaik there is no such thing as a system default interface on Linux, there's only routing which doesn't apply here.
(c) the use cases we list want a specific interface not a default

Brian

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