netdev - Re: [PATCH bpf-next v2 1/4] net: add SO_NETNS

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Date:   Fri, 19 Feb 2021 12:23:59 +0000
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: [PATCH bpf-next v2 1/4] net: add SO_NETNS_COOKIE socket option

On Fri, 19 Feb 2021 at 11:49, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> > +     case SO_NETNS_COOKIE:
> > +             lv = sizeof(u64);
> > +             if (len < lv)
> > +                     return -EINVAL;
>
>         if (len != lv)
>                 return -EINVAL;
>
> (There is no reason to support bigger value before at least hundred years)

Sorry that was copy pasta from SO_COOKIE which uses the same check. I'll
change it to your suggestion. Want me to fix SO_COOKIE as well?

>
> > +#ifdef CONFIG_NET_NS
> > +             v.val64 = sock_net(sk)->net_cookie;
> > +#else
> > +             v.val64 = init_net.net_cookie;
> > +#endif
> > +             break;
> > +
>
> Why using this ugly #ifdef ?
>
> The following should work just fine, even if CONFIG_NET_NS is not set.
>
> v.val64 = sock_net(sk)->net_cookie;

I looked at sock_net and didn't understand how it avoids a compile error
so I didn't use it, thanks for pointing this out.

-- 
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

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