netdev - RE: [PATCH 07/10] netfilter: Force fake conntrack entry to be at least 8 bytes aligned

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Date:   Thu, 16 Mar 2017 09:55:29 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Pablo Neira Ayuso' <pablo@...filter.org>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 07/10] netfilter: Force fake conntrack entry to be at
 least 8 bytes aligned

From: Pablo Neira Ayuso
> Sent: 15 March 2017 17:01
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> Since the nfct and nfctinfo have been combined, the nf_conn structure
> must be at least 8 bytes aligned, as the 3 LSB bits are used for the
> nfctinfo. But there's a fake nf_conn structure to denote untracked
> connections, which is created by a PER_CPU construct. This does not
> guarantee that it will be 8 bytes aligned and can break the logic in
> determining the correct nfctinfo.

Can't you just add an __aligned(8) onto the structure definition?

	David