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Date:      Sat, 2 Nov 2013 09:44:33 +0000
From:      Mark R V Murray <mark@grondar.org>
To:        Mark Robert Vaughan Murray <mark@grondar.org>
Cc:        "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, Adrian Chadd <adrian@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Bruce Evans <brde@optusnet.com.au>
Subject:   Re: svn commit: r257535 - head/sys/netgraph
Message-ID:  <0FD2B8FA-7DD7-4626-95F6-BB64B648E81A@grondar.org>
In-Reply-To: <76BC3F76-ED5E-42F0-BCCE-271EA723698E@grondar.org>
References:  <201311020011.rA20BchL020170@svn.freebsd.org> <20131102151309.A1102@besplex.bde.org> <CAJ-VmokeP5Z2d7jZ-j-Thrh_VuQBKGpKC9nWG%2BQfhR0f6wzF9w@mail.gmail.com> <76BC3F76-ED5E-42F0-BCCE-271EA723698E@grondar.org>

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On 2 Nov 2013, at 09:32, Mark R V Murray <mark@grondar.org> wrote:
>> Mark - did you initially mean the address of the mbuf m_data pointer,
>> or the data payload itself?
>=20
> As Bruce says - the address of payload data itself. We don=92t have =
12-byte pointers in FreeBSD. :-)

Cancel that.

The address passed must be the address of the m_data field in the mbuf =
structure. The harvested data is 12 bytes from that address forward, so =
not the data pointed to by that m_data pointer but the pointer value =
itself and some following junk too.

M
--=20
Mark R V Murray


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