netdev - Get the credentials from the socket peer file struct

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Message-ID: <AANLkTikP3uqAhULgHp-K871wZq5RQoZVLOCiySj35ZkC@mail.gmail.com>
Date:	Tue, 30 Nov 2010 12:13:14 +0200
From:	Laszlo Papp <djszapi@...hlinux.us>
To:	netdev@...r.kernel.org
Subject: Get the credentials from the socket peer file struct

Hi,

How can I get the socket peer file struct ?
I would like to implement a new ioctl in my kernelspace code (similar
to SO_PEERCRED), but to get all the credentials.

The file struct of the socket struct has a cred struct members, but
that is for the local file struct, not from the peer file struct.

I tried to grok the documentation, but I do not entirely understand
the 'struct sock' internals.
(http://lxr.free-electrons.com/source/include/net/sock.h?v=2.6.32;a=arm#L144)
SO_PEERCRED just picks 'sk_peercred' struct ucred structure up from
there, but I need a more fine-tuned const struct cred structure in
this special case.

I am not subscrobed for the list, so please add me into the 'CC'
field. Thank you in advance!

Best Regards,
Laszlo Papp
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