netdev - Re: [net-next v1] net/ipv6: allow any source address for sendmsg pktinfo with ip_nonlocal

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Date:   Sun, 29 Jul 2018 12:28:28 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     vincent@...nat.im
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org, tom@...bertland.com
Subject: Re: [net-next v1] net/ipv6: allow any source address for sendmsg
 pktinfo with ip_nonlocal_bind

From: Vincent Bernat <vincent@...nat.im>
Date: Wed, 25 Jul 2018 13:19:13 +0200

> When freebind feature is set of an IPv6 socket, any source address can
> be used when sending UDP datagrams using IPv6 PKTINFO ancillary
> message. Global non-local bind feature was added in commit
> 35a256fee52c ("ipv6: Nonlocal bind") for IPv6. This commit also allows
> IPv6 source address spoofing when non-local bind feature is enabled.
> 
> Signed-off-by: Vincent Bernat <vincent@...nat.im>

This definitely seems to make sense.  And is consistent with the other
tests involving freebind and transparent.

This test involving ip_nonlocal_bind, freeebind, and transparent happens
in several locations.  Perhaps we should add a helper function for this?

Thanks.