netdev - Re: [PATCH v2] Implement IP_UNICAST

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Date:	Thu, 2 Feb 2012 15:29:44 -0700
From:	"Erich E. Hoover" <ehoover@...es.edu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] Implement IP_UNICAST_IF socket option.

On Thu, Feb 2, 2012 at 2:57 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 02 février 2012 à 14:36 -0700, Erich E. Hoover a écrit :
> > ...
> > +             if (sk->sk_bound_dev_if && ifindex != sk->sk_bound_dev_if)
> > +                     break;
>
> what happens if later sk_bound_dev_if is changed ? Should we redo the
> above tests ?

Would it be better if ip_default_ifindex performed the same comparison
and prioritized the sk->sk_bound_dev_if value?

> > ...
> > +     case IP_UNICAST_IF:
> > +     {
> > +             __be32 iface;
> > +
> > +             len = sizeof(__be32);
> > +             iface = htonl(inet->outif_index);
> > +             release_sock(sk);
> > +
> > +             if (put_user(len, optlen))
> > +                     return -EFAULT;
> > +             if (copy_to_user(optval, &iface, len))
> > +                     return -EFAULT;
> > +             return 0;
>
> wow.... thats not pretty...
>
>        what about :
>
>        case IP_UNICASE_IF:
>                val = htonl(inet->outif_index);
>                break;
>

The return value needs to be 4 bytes even if sizeof(int) != 4.

> > ...
> IPv6 not supported ?

Nope, at least according to the documentation the option is only for
IPv4 (IPPROTO_IP).

Erich Hoover
ehoover@...es.edu
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