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Subject: [Bug 207087] kernel: r295285 in 10.2-STABLE breaks OpenVPN
 functionality
Date: Tue, 16 Feb 2016 14:42:50 +0000
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X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.2-STABLE
X-Bugzilla-Keywords: regression
X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: g_amanakis@yahoo.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207087

--- Comment #38 from g_amanakis@yahoo.com ---
I think the problem lies here:
=3D=3D=3D=3D=3D=3D=3D8<=3D=3D=3D=3D=3D=3D=3D=3D
ip_fastfwd.c

if (ip_off & IP_DF) {=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
   IPSTAT_INC(ips_cantfrag);
   icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
            0, mtu);=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20
   goto consumed;
} else {=20=20=20=20=20=20
=3D=3D=3D=3D=3D=3D=3D8<=3D=3D=3D=3D=3D=3D=3D=3D

By the time the icmp_error() happens, m has gone through the firewall (see
"Step 5:" in ip_fastfwd.c, meaning that outgoing NAT has already happened a=
nd
that the source address of has already been changed to reflect the one of t=
he
gateway. Thus when the icmp_error() takes place the ICMP is not sent to the
client.

Is this correct?

--=20
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