341 lines
11 KiB
C
341 lines
11 KiB
C
/* $OpenBSD: bpf.h,v 1.72 2024/01/26 21:14:08 jan Exp $ */
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/* $NetBSD: bpf.h,v 1.15 1996/12/13 07:57:33 mikel Exp $ */
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/*
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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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* 3. 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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*/
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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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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next even multiple of
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* BPF_ALIGNMENT (which is at least as much as what a timeval needs).
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*/
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#define BPF_ALIGNMENT sizeof(u_int32_t)
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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 (2 * 1024 * 1024)
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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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* BPF ioctls
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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 BIOCSRSIG _IOW('B',114, u_int)
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#define BIOCGRSIG _IOR('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 BIOCLOCK _IO('B',118)
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#define BIOCSETWF _IOW('B',119, struct bpf_program)
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#define BIOCGFILDROP _IOR('B',120, u_int)
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#define BIOCSFILDROP _IOW('B',121, u_int)
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#define BIOCSDLT _IOW('B',122, u_int)
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#define BIOCGDLTLIST _IOWR('B',123, struct bpf_dltlist)
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#define BIOCGDIRFILT _IOR('B',124, u_int)
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#define BIOCSDIRFILT _IOW('B',125, u_int)
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#define BIOCSWTIMEOUT _IOW('B',126, struct timeval)
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#define BIOCGWTIMEOUT _IOR('B',126, struct timeval)
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#define BIOCDWTIMEOUT _IO('B',126)
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/*
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* Direction filters for BIOCSDIRFILT/BIOCGDIRFILT
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*/
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#define BPF_DIRECTION_IN (1 << 0)
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#define BPF_DIRECTION_OUT (1 << 1)
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/*
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* Values for BIOCGFILDROP/BIOCSFILDROP
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*/
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#define BPF_FILDROP_PASS 0 /* capture, pass */
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#define BPF_FILDROP_CAPTURE 1 /* capture, drop */
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#define BPF_FILDROP_DROP 2 /* no capture, drop */
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struct bpf_timeval {
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u_int32_t tv_sec;
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u_int32_t tv_usec;
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};
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/*
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* Structure prepended to each packet.
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*/
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struct bpf_hdr {
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struct bpf_timeval bh_tstamp; /* time stamp */
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u_int32_t bh_caplen; /* length of captured portion */
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u_int32_t bh_datalen; /* original length of packet */
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u_int16_t bh_hdrlen; /* length of bpf header (this struct
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plus alignment padding) */
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u_int16_t bh_ifidx; /* receive interface index */
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u_int16_t bh_flowid;
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u_int8_t bh_flags;
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#define BPF_F_PRI_MASK 0x07
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#define BPF_F_FLOWID 0x08
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#define BPF_F_DIR_SHIFT 4
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#define BPF_F_DIR_MASK (0x3 << BPF_F_DIR_SHIFT)
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#define BPF_F_DIR_IN (BPF_DIRECTION_IN << BPF_F_DIR_SHIFT)
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#define BPF_F_DIR_OUT (BPF_DIRECTION_OUT << BPF_F_DIR_SHIFT)
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u_int8_t bh_drops;
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u_int16_t bh_csumflags; /* checksum flags */
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};
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#ifdef _KERNEL
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#define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
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#endif
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/*
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* Data-link level type codes.
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*/
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#define DLT_NULL 0 /* no link-layer encapsulation */
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#define DLT_EN10MB 1 /* Ethernet (10Mb) */
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#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
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#define DLT_AX25 3 /* Amateur Radio AX.25 */
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#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
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#define DLT_CHAOS 5 /* Chaos */
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#define DLT_IEEE802 6 /* IEEE 802 Networks */
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#define DLT_ARCNET 7 /* ARCNET */
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#define DLT_SLIP 8 /* Serial Line IP */
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#define DLT_PPP 9 /* Point-to-point Protocol */
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#define DLT_FDDI 10 /* FDDI */
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#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
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#define DLT_LOOP 12 /* loopback type (af header) */
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#define DLT_ENC 13 /* IPSEC enc type (af header, spi, flags) */
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#define DLT_RAW 14 /* raw IP */
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#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
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#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
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#define DLT_PFSYNC 18 /* Packet filter state syncing */
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#define DLT_PPP_SERIAL 50 /* PPP over Serial with HDLC */
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#define DLT_PPP_ETHER 51 /* PPP over Ethernet; session only w/o ether header */
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#define DLT_C_HDLC 104 /* Cisco HDLC */
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#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
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#define DLT_PFLOG 117 /* Packet filter logging, by pcap people */
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#define DLT_IEEE802_11_RADIO 127 /* IEEE 802.11 plus WLAN header */
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#define DLT_USER0 147 /* Reserved for private use */
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#define DLT_USER1 148 /* Reserved for private use */
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#define DLT_USER2 149 /* Reserved for private use */
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#define DLT_USER3 150 /* Reserved for private use */
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#define DLT_USER4 151 /* Reserved for private use */
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#define DLT_USER5 152 /* Reserved for private use */
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#define DLT_USER6 153 /* Reserved for private use */
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#define DLT_USER7 154 /* Reserved for private use */
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#define DLT_USER8 155 /* Reserved for private use */
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#define DLT_USER9 156 /* Reserved for private use */
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#define DLT_USER10 157 /* Reserved for private use */
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#define DLT_USER11 158 /* Reserved for private use */
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#define DLT_USER12 159 /* Reserved for private use */
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#define DLT_USER13 160 /* Reserved for private use */
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#define DLT_USER14 161 /* Reserved for private use */
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#define DLT_USER15 162 /* Reserved for private use */
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#define DLT_USBPCAP 249 /* USBPcap */
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#define DLT_MPLS 219 /* MPLS Provider Edge header */
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#define DLT_OPENFLOW 267 /* in-kernel OpenFlow, by pcap */
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/*
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* The instruction encodings.
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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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#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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#define BPF_RND 0xc0
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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_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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#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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/* misc */
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#define BPF_MISCOP(code) ((code) & 0xf8)
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#define BPF_TAX 0x00
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#define BPF_TXA 0x80
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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_int16_t code;
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u_char jt;
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u_char jf;
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u_int32_t k;
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};
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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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/*
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* Load operations for _bpf_filter to use against the packet pointer.
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*/
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struct bpf_ops {
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u_int32_t (*ldw)(const void *, u_int32_t, int *);
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u_int32_t (*ldh)(const void *, u_int32_t, int *);
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u_int32_t (*ldb)(const void *, u_int32_t, int *);
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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_int16_t)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_int16_t)(code), jt, jf, k }
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__BEGIN_DECLS
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u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int)
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__bounded((__buffer__, 2, 4));
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u_int _bpf_filter(const struct bpf_insn *, const struct bpf_ops *,
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const void *, u_int);
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__END_DECLS
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#ifdef _KERNEL
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struct ifnet;
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struct mbuf;
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int bpf_validate(struct bpf_insn *, int);
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int bpf_mtap(caddr_t, const struct mbuf *, u_int);
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int bpf_mtap_hdr(caddr_t, const void *, u_int, const struct mbuf *, u_int);
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int bpf_mtap_af(caddr_t, u_int32_t, const struct mbuf *, u_int);
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int bpf_mtap_ether(caddr_t, const struct mbuf *, u_int);
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int bpf_tap_hdr(caddr_t, const void *, u_int, const void *, u_int, u_int);
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void bpfattach(caddr_t *, struct ifnet *, u_int, u_int);
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void bpfdetach(struct ifnet *);
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void *bpfsattach(caddr_t *, const char *, u_int, u_int);
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void bpfsdetach(void *);
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void bpfilterattach(int);
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u_int bpf_mfilter(const struct bpf_insn *, const struct mbuf *, u_int);
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#endif /* _KERNEL */
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/*
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* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
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*/
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#define BPF_MEMWORDS 16
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#endif /* _NET_BPF_H_ */
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