Re: [PATCH v2] sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND

[David Miller <davem@davemloft.net>]

From: Laszlo Toth <laszlth@gmail.com>
Date: Mon, 23 Oct 2017 19:19:33 +0200

> Commit 9b9742022888 ("sctp: support ipv6 nonlocal bind")
> introduced support for the above options as v4 sctp did,
> so patched sctp_v6_available().
> 
> In the v4 implementation it's enough, because
> sctp_inet_bind_verify() just returns with sctp_v4_available().
> However sctp_inet6_bind_verify() has an extra check before that
> for link-local scope_id, which won't respect the above options.
> 
> Added the checks before calling ipv6_chk_addr(), but
> not before the validation of scope_id.
> 
> before (w/ both options):
>  ./v6test fe80::10 sctp
>  bind failed, errno: 99 (Cannot assign requested address)
>  ./v6test fe80::10 tcp
>  bind success, errno: 0 (Success)
> 
> after (w/ both options):
>  ./v6test fe80::10 sctp
>  bind success, errno: 0 (Success)
> 
> Signed-off-by: Laszlo Toth <laszlth@gmail.com>

Applied.