474 lines
15 KiB
C
474 lines
15 KiB
C
/*-
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* Copyright (c) 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)bpf.h 8.1 (Berkeley) 6/10/93
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* @(#)bpf.h 1.34 (LBL) 6/16/96
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*
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* $FreeBSD$
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*/
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#ifndef _NET_BPF_H_
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#define _NET_BPF_H_
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/* BSD style release date */
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#define BPF_RELEASE 199606
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typedef int32_t bpf_int32;
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typedef u_int32_t bpf_u_int32;
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typedef int64_t bpf_int64;
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typedef u_int64_t bpf_u_int64;
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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next
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* even multiple of BPF_ALIGNMENT.
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*/
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#define BPF_ALIGNMENT sizeof(long)
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#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
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#define BPF_MAXINSNS 512
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#define BPF_MAXBUFSIZE 0x80000
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#define BPF_MINBUFSIZE 32
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/*
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* Structure for BIOCSETF.
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*/
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struct bpf_program {
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u_int bf_len;
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struct bpf_insn *bf_insns;
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};
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/*
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* Struct returned by BIOCGSTATS.
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*/
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struct bpf_stat {
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u_int bs_recv; /* number of packets received */
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u_int bs_drop; /* number of packets dropped */
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};
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/*
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* Struct return by BIOCVERSION. This represents the version number of
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* the filter language described by the instruction encodings below.
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* bpf understands a program iff kernel_major == filter_major &&
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* kernel_minor >= filter_minor, that is, if the value returned by the
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* running kernel has the same major number and a minor number equal
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* equal to or less than the filter being downloaded. Otherwise, the
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* results are undefined, meaning an error may be returned or packets
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* may be accepted haphazardly.
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* It has nothing to do with the source code version.
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*/
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struct bpf_version {
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u_short bv_major;
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u_short bv_minor;
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};
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/* Current version number of filter architecture. */
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#define BPF_MAJOR_VERSION 1
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#define BPF_MINOR_VERSION 1
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/*
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* Historically, BPF has supported a single buffering model, first using mbuf
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* clusters in kernel, and later using malloc(9) buffers in kernel. We now
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* support multiple buffering modes, which may be queried and set using
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* BIOCGETBUFMODE and BIOCSETBUFMODE. So as to avoid handling the complexity
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* of changing modes while sniffing packets, the mode becomes fixed once an
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* interface has been attached to the BPF descriptor.
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*/
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#define BPF_BUFMODE_BUFFER 1 /* Kernel buffers with read(). */
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#define BPF_BUFMODE_ZBUF 2 /* Zero-copy buffers. */
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/*-
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* Struct used by BIOCSETZBUF, BIOCROTZBUF: describes up to two zero-copy
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* buffer as used by BPF.
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*/
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struct bpf_zbuf {
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void *bz_bufa; /* Location of 'a' zero-copy buffer. */
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void *bz_bufb; /* Location of 'b' zero-copy buffer. */
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size_t bz_buflen; /* Size of zero-copy buffers. */
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};
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#define BIOCGBLEN _IOR('B', 102, u_int)
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#define BIOCSBLEN _IOWR('B', 102, u_int)
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#define BIOCSETF _IOW('B', 103, struct bpf_program)
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#define BIOCFLUSH _IO('B', 104)
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#define BIOCPROMISC _IO('B', 105)
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#define BIOCGDLT _IOR('B', 106, u_int)
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#define BIOCGETIF _IOR('B', 107, struct ifreq)
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#define BIOCSETIF _IOW('B', 108, struct ifreq)
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#define BIOCSRTIMEOUT _IOW('B', 109, struct timeval)
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#define BIOCGRTIMEOUT _IOR('B', 110, struct timeval)
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#define BIOCGSTATS _IOR('B', 111, struct bpf_stat)
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#define BIOCIMMEDIATE _IOW('B', 112, u_int)
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#define BIOCVERSION _IOR('B', 113, struct bpf_version)
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#define BIOCGRSIG _IOR('B', 114, u_int)
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#define BIOCSRSIG _IOW('B', 115, u_int)
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#define BIOCGHDRCMPLT _IOR('B', 116, u_int)
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#define BIOCSHDRCMPLT _IOW('B', 117, u_int)
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#define BIOCGDIRECTION _IOR('B', 118, u_int)
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#define BIOCSDIRECTION _IOW('B', 119, u_int)
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#define BIOCSDLT _IOW('B', 120, u_int)
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#define BIOCGDLTLIST _IOWR('B', 121, struct bpf_dltlist)
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#define BIOCLOCK _IO('B', 122)
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#define BIOCSETWF _IOW('B', 123, struct bpf_program)
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#define BIOCFEEDBACK _IOW('B', 124, u_int)
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#define BIOCGETBUFMODE _IOR('B', 125, u_int)
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#define BIOCSETBUFMODE _IOW('B', 126, u_int)
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#define BIOCGETZMAX _IOR('B', 127, size_t)
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#define BIOCROTZBUF _IOR('B', 128, struct bpf_zbuf)
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#define BIOCSETZBUF _IOW('B', 129, struct bpf_zbuf)
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#define BIOCSETFNR _IOW('B', 130, struct bpf_program)
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#define BIOCGTSTAMP _IOR('B', 131, u_int)
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#define BIOCSTSTAMP _IOW('B', 132, u_int)
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/* Obsolete */
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#define BIOCGSEESENT BIOCGDIRECTION
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#define BIOCSSEESENT BIOCSDIRECTION
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/* Packet directions */
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enum bpf_direction {
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BPF_D_IN, /* See incoming packets */
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BPF_D_INOUT, /* See incoming and outgoing packets */
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BPF_D_OUT /* See outgoing packets */
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};
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/* Time stamping functions */
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#define BPF_T_MICROTIME 0x0000
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#define BPF_T_NANOTIME 0x0001
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#define BPF_T_BINTIME 0x0002
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#define BPF_T_NONE 0x0003
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#define BPF_T_FORMAT_MASK 0x0003
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#define BPF_T_NORMAL 0x0000
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#define BPF_T_FAST 0x0100
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#define BPF_T_MONOTONIC 0x0200
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#define BPF_T_MONOTONIC_FAST (BPF_T_FAST | BPF_T_MONOTONIC)
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#define BPF_T_FLAG_MASK 0x0300
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#define BPF_T_FORMAT(t) ((t) & BPF_T_FORMAT_MASK)
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#define BPF_T_FLAG(t) ((t) & BPF_T_FLAG_MASK)
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#define BPF_T_VALID(t) \
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((t) == BPF_T_NONE || (BPF_T_FORMAT(t) != BPF_T_NONE && \
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((t) & ~(BPF_T_FORMAT_MASK | BPF_T_FLAG_MASK)) == 0))
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#define BPF_T_MICROTIME_FAST (BPF_T_MICROTIME | BPF_T_FAST)
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#define BPF_T_NANOTIME_FAST (BPF_T_NANOTIME | BPF_T_FAST)
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#define BPF_T_BINTIME_FAST (BPF_T_BINTIME | BPF_T_FAST)
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#define BPF_T_MICROTIME_MONOTONIC (BPF_T_MICROTIME | BPF_T_MONOTONIC)
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#define BPF_T_NANOTIME_MONOTONIC (BPF_T_NANOTIME | BPF_T_MONOTONIC)
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#define BPF_T_BINTIME_MONOTONIC (BPF_T_BINTIME | BPF_T_MONOTONIC)
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#define BPF_T_MICROTIME_MONOTONIC_FAST (BPF_T_MICROTIME | BPF_T_MONOTONIC_FAST)
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#define BPF_T_NANOTIME_MONOTONIC_FAST (BPF_T_NANOTIME | BPF_T_MONOTONIC_FAST)
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#define BPF_T_BINTIME_MONOTONIC_FAST (BPF_T_BINTIME | BPF_T_MONOTONIC_FAST)
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/*
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* Structure prepended to each packet.
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*/
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struct bpf_ts {
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bpf_int64 bt_sec; /* seconds */
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bpf_u_int64 bt_frac; /* fraction */
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};
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struct bpf_xhdr {
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struct bpf_ts bh_tstamp; /* time stamp */
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bpf_u_int32 bh_caplen; /* length of captured portion */
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bpf_u_int32 bh_datalen; /* original length of packet */
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u_short bh_hdrlen; /* length of bpf header (this struct
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plus alignment padding) */
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};
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/* Obsolete */
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struct bpf_hdr {
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struct timeval bh_tstamp; /* time stamp */
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bpf_u_int32 bh_caplen; /* length of captured portion */
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bpf_u_int32 bh_datalen; /* original length of packet */
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u_short bh_hdrlen; /* length of bpf header (this struct
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plus alignment padding) */
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};
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#ifdef _KERNEL
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#define MTAG_BPF 0x627066
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#define MTAG_BPF_TIMESTAMP 0
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#endif
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/*
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* When using zero-copy BPF buffers, a shared memory header is present
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* allowing the kernel BPF implementation and user process to synchronize
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* without using system calls. This structure defines that header. When
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* accessing these fields, appropriate atomic operation and memory barriers
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* are required in order not to see stale or out-of-order data; see bpf(4)
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* for reference code to access these fields from userspace.
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*
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* The layout of this structure is critical, and must not be changed; if must
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* fit in a single page on all architectures.
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*/
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struct bpf_zbuf_header {
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volatile u_int bzh_kernel_gen; /* Kernel generation number. */
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volatile u_int bzh_kernel_len; /* Length of data in the buffer. */
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volatile u_int bzh_user_gen; /* User generation number. */
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u_int _bzh_pad[5];
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};
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/* Pull in data-link level type codes. */
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#include <net/dlt.h>
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/*
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* The instruction encodings.
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*
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* Please inform tcpdump-workers@lists.tcpdump.org if you use any
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* of the reserved values, so that we can note that they're used
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* (and perhaps implement it in the reference BPF implementation
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* and encourage its implementation elsewhere).
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*/
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/*
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* The upper 8 bits of the opcode aren't used. BSD/OS used 0x8000.
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*/
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/* instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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/* 0x18 reserved; used by BSD/OS */
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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/* 0xc0 reserved; used by BSD/OS */
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/* 0xe0 reserved; used by BSD/OS */
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_MOD 0x90
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#define BPF_XOR 0xa0
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/* 0xb0 reserved */
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/* 0xc0 reserved */
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/* 0xd0 reserved */
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/* 0xe0 reserved */
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/* 0xf0 reserved */
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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/* 0x50 reserved; used on BSD/OS */
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/* 0x60 reserved */
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/* 0x70 reserved */
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/* 0x80 reserved */
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/* 0x90 reserved */
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/* 0xa0 reserved */
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/* 0xb0 reserved */
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/* 0xc0 reserved */
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/* 0xd0 reserved */
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/* 0xe0 reserved */
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/* 0xf0 reserved */
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* ret - BPF_K and BPF_X also apply */
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#define BPF_RVAL(code) ((code) & 0x18)
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#define BPF_A 0x10
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/* 0x18 reserved */
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/* misc */
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#define BPF_MISCOP(code) ((code) & 0xf8)
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#define BPF_TAX 0x00
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/* 0x08 reserved */
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/* 0x10 reserved */
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/* 0x18 reserved */
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/* #define BPF_COP 0x20 NetBSD "coprocessor" extensions */
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/* 0x28 reserved */
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/* 0x30 reserved */
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/* 0x38 reserved */
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/* #define BPF_COPX 0x40 NetBSD "coprocessor" extensions */
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/* also used on BSD/OS */
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/* 0x48 reserved */
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/* 0x50 reserved */
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/* 0x58 reserved */
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/* 0x60 reserved */
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/* 0x68 reserved */
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/* 0x70 reserved */
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/* 0x78 reserved */
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#define BPF_TXA 0x80
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/* 0x88 reserved */
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/* 0x90 reserved */
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/* 0x98 reserved */
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/* 0xa0 reserved */
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/* 0xa8 reserved */
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/* 0xb0 reserved */
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/* 0xb8 reserved */
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/* 0xc0 reserved; used on BSD/OS */
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/* 0xc8 reserved */
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/* 0xd0 reserved */
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/* 0xd8 reserved */
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/* 0xe0 reserved */
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/* 0xe8 reserved */
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/* 0xf0 reserved */
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/* 0xf8 reserved */
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/*
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* The instruction data structure.
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*/
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struct bpf_insn {
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u_short code;
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u_char jt;
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u_char jf;
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bpf_u_int32 k;
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};
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/*
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* Macros for insn array initializers.
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*/
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#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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/*
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* Structure to retrieve available DLTs for the interface.
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*/
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struct bpf_dltlist {
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u_int bfl_len; /* number of bfd_list array */
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u_int *bfl_list; /* array of DLTs */
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};
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#ifdef _KERNEL
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_BPF);
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#endif
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#ifdef SYSCTL_DECL
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SYSCTL_DECL(_net_bpf);
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#endif
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/*
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* Rotate the packet buffers in descriptor d. Move the store buffer into the
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* hold slot, and the free buffer into the store slot. Zero the length of the
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* new store buffer. Descriptor lock should be held. One must be careful to
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* not rotate the buffers twice, i.e. if fbuf != NULL.
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*/
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#define ROTATE_BUFFERS(d) do { \
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(d)->bd_hbuf = (d)->bd_sbuf; \
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(d)->bd_hlen = (d)->bd_slen; \
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(d)->bd_sbuf = (d)->bd_fbuf; \
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(d)->bd_slen = 0; \
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(d)->bd_fbuf = NULL; \
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bpf_bufheld(d); \
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} while (0)
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/*
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* Descriptor associated with each attached hardware interface.
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* Part of this structure is exposed to external callers to speed up
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* bpf_peers_present() calls.
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*/
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struct bpf_if;
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struct bpf_if_ext {
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LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */
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LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */
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};
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void bpf_bufheld(struct bpf_d *d);
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int bpf_validate(const struct bpf_insn *, 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 bpfattach(struct ifnet *, u_int, u_int);
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void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
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void bpfdetach(struct ifnet *);
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#ifdef VIMAGE
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int bpf_get_bp_params(struct bpf_if *, u_int *, u_int *);
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#endif
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void bpfilterattach(int);
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u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
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static __inline int
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bpf_peers_present(struct bpf_if *bpf)
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{
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struct bpf_if_ext *ext;
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ext = (struct bpf_if_ext *)bpf;
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if (!LIST_EMPTY(&ext->bif_dlist))
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return (1);
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return (0);
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}
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#define BPF_TAP(_ifp,_pkt,_pktlen) do { \
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if (bpf_peers_present((_ifp)->if_bpf)) \
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bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \
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} while (0)
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#define BPF_MTAP(_ifp,_m) do { \
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if (bpf_peers_present((_ifp)->if_bpf)) { \
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M_ASSERTVALID(_m); \
|
|
bpf_mtap((_ifp)->if_bpf, (_m)); \
|
|
} \
|
|
} while (0)
|
|
#define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \
|
|
if (bpf_peers_present((_ifp)->if_bpf)) { \
|
|
M_ASSERTVALID(_m); \
|
|
bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \
|
|
} \
|
|
} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
|
|
*/
|
|
#define BPF_MEMWORDS 16
|
|
|
|
#ifdef _SYS_EVENTHANDLER_H_
|
|
/* BPF attach/detach events */
|
|
struct ifnet;
|
|
typedef void (*bpf_track_fn)(void *, struct ifnet *, int /* dlt */,
|
|
int /* 1 =>'s attach */);
|
|
EVENTHANDLER_DECLARE(bpf_track, bpf_track_fn);
|
|
#endif /* _SYS_EVENTHANDLER_H_ */
|
|
|
|
#endif /* _NET_BPF_H_ */
|