76 lines
2.9 KiB
Groff
76 lines
2.9 KiB
Groff
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.\" $NetBSD: bpf.9,v 1.1 2010/01/20 12:09:39 pooka Exp $
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.\"
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.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 20, 2010
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.Dt BPF 9
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.Os
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.Sh NAME
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.Nm bpf
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.Nd Berkeley Packet Filter kernel interface
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.Sh SYNOPSIS
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.In sys/mbuf.h
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.In net/bpf.h
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.Sh DESCRIPTION
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.Nm
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is called via an operations vector described by the following struct:
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.Pp
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.Bd -literal
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struct bpf_ops {
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void (*bpf_attach)(struct ifnet *, u_int, u_int, struct bpf_if **);
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void (*bpf_detach)(struct ifnet *);
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void (*bpf_change_type)(struct ifnet *, u_int, u_int);
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void (*bpf_tap)(struct bpf_if *, u_char *, u_int);
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void (*bpf_mtap)(struct bpf_if *, struct mbuf *);
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void (*bpf_mtap2)(struct bpf_if *, void *, u_int, struct mbuf *);
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void (*bpf_mtap_af)(struct bpf_if *, uint32_t, struct mbuf *);
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void (*bpf_mtap_et)(struct bpf_if *, uint16_t, struct mbuf *);
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void (*bpf_mtap_sl_in)(struct bpf_if *, u_char *, struct mbuf **);
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void (*bpf_mtap_sl_out)(struct bpf_if *, u_char *, struct mbuf *);
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};
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.Ed
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.Pp
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This vector is found from
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.Vt struct bpf_ops *
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.Va bpf_ops ,
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and is either a stub implementation or a real implementation depending
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on if bpf is absent or present in the kernel, respectively.
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.Sh CODE REFERENCES
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This section describes places within the
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.Nx
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source tree where the implementation can be found.
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All pathnames are relative to
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.Pa /usr/src .
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.Pp
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The
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.Nm
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implementation is located in
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.Pa sys/net/bpf.c ,
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the stub implementation is in
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.Pa sys/net/bpf_stub.c
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and the interface is defined in
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.Pa sys/net/bpf.h .
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