netdev - IPv6 extension header privileges

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Message-ID: <CALx6S36x2+HBLSYVBi0+rQAgejbVvvFF7fr0P13cTspxpJQCLg@mail.gmail.com>
Date:	Fri, 20 May 2016 15:37:32 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: IPv6 extension header privileges

Hi,

In ipv6_sockglue.c I noticed:

/* hop-by-hop / destination options are privileged option */
retv = -EPERM;
if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
           break;

Can anyone provide that rationale as to why these are privileged ops?

Thanks,
Tom