372 lines
11 KiB
C
372 lines
11 KiB
C
/* $NetBSD: bpf.h,v 1.57 2010/12/05 02:40:40 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1990, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from the Stanford/CMU enet packet filter,
|
|
* (net/enet.c) distributed as part of 4.3BSD, and code contributed
|
|
* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
|
|
* Berkeley Laboratory.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)bpf.h 8.2 (Berkeley) 1/9/95
|
|
* @(#) Header: bpf.h,v 1.36 97/06/12 14:29:53 leres Exp (LBL)
|
|
*/
|
|
|
|
#ifndef _NET_BPF_H_
|
|
#define _NET_BPF_H_
|
|
|
|
#include <sys/time.h>
|
|
|
|
/* BSD style release date */
|
|
#define BPF_RELEASE 199606
|
|
|
|
typedef int bpf_int32;
|
|
typedef u_int bpf_u_int32;
|
|
|
|
/*
|
|
* Alignment macros. BPF_WORDALIGN rounds up to the next
|
|
* even multiple of BPF_ALIGNMENT.
|
|
*/
|
|
#define BPF_ALIGNMENT sizeof(long)
|
|
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
|
|
|
|
#define BPF_MAXINSNS 512
|
|
#define BPF_DFLTBUFSIZE (1024*1024) /* default static upper limit */
|
|
#define BPF_MAXBUFSIZE (1024*1024*16) /* hard limit on sysctl'able value */
|
|
#define BPF_MINBUFSIZE 32
|
|
|
|
/*
|
|
* Structure for BIOCSETF.
|
|
*/
|
|
struct bpf_program {
|
|
u_int bf_len;
|
|
struct bpf_insn *bf_insns;
|
|
};
|
|
|
|
/*
|
|
* Struct returned by BIOCGSTATS and net.bpf.stats sysctl.
|
|
*/
|
|
struct bpf_stat {
|
|
uint64_t bs_recv; /* number of packets received */
|
|
uint64_t bs_drop; /* number of packets dropped */
|
|
uint64_t bs_capt; /* number of packets captured */
|
|
uint64_t bs_padding[13];
|
|
};
|
|
|
|
/*
|
|
* Struct returned by BIOCGSTATSOLD.
|
|
*/
|
|
struct bpf_stat_old {
|
|
u_int bs_recv; /* number of packets received */
|
|
u_int bs_drop; /* number of packets dropped */
|
|
};
|
|
|
|
/*
|
|
* Struct return by BIOCVERSION. This represents the version number of
|
|
* the filter language described by the instruction encodings below.
|
|
* bpf understands a program iff kernel_major == filter_major &&
|
|
* kernel_minor >= filter_minor, that is, if the value returned by the
|
|
* running kernel has the same major number and a minor number equal
|
|
* equal to or less than the filter being downloaded. Otherwise, the
|
|
* results are undefined, meaning an error may be returned or packets
|
|
* may be accepted haphazardly.
|
|
* It has nothing to do with the source code version.
|
|
*/
|
|
struct bpf_version {
|
|
u_short bv_major;
|
|
u_short bv_minor;
|
|
};
|
|
/* Current version number of filter architecture. */
|
|
#define BPF_MAJOR_VERSION 1
|
|
#define BPF_MINOR_VERSION 1
|
|
|
|
/*
|
|
* BPF ioctls
|
|
*
|
|
* The first set is for compatibility with Sun's pcc style
|
|
* header files. If your using gcc, we assume that you
|
|
* have run fixincludes so the latter set should work.
|
|
*/
|
|
#define BIOCGBLEN _IOR('B',102, u_int)
|
|
#define BIOCSBLEN _IOWR('B',102, u_int)
|
|
#define BIOCSETF _IOW('B',103, struct bpf_program)
|
|
#define BIOCFLUSH _IO('B',104)
|
|
#define BIOCPROMISC _IO('B',105)
|
|
#define BIOCGDLT _IOR('B',106, u_int)
|
|
#define BIOCGETIF _IOR('B',107, struct ifreq)
|
|
#define BIOCSETIF _IOW('B',108, struct ifreq)
|
|
#ifdef COMPAT_50
|
|
#include <compat/sys/time.h>
|
|
#define BIOCSORTIMEOUT _IOW('B',109, struct timeval50)
|
|
#define BIOCGORTIMEOUT _IOR('B',110, struct timeval50)
|
|
#endif
|
|
#define BIOCGSTATS _IOR('B',111, struct bpf_stat)
|
|
#define BIOCGSTATSOLD _IOR('B',111, struct bpf_stat_old)
|
|
#define BIOCIMMEDIATE _IOW('B',112, u_int)
|
|
#define BIOCVERSION _IOR('B',113, struct bpf_version)
|
|
#define BIOCSTCPF _IOW('B',114, struct bpf_program)
|
|
#define BIOCSUDPF _IOW('B',115, struct bpf_program)
|
|
#define BIOCGHDRCMPLT _IOR('B',116, u_int)
|
|
#define BIOCSHDRCMPLT _IOW('B',117, u_int)
|
|
#define BIOCSDLT _IOW('B',118, u_int)
|
|
#define BIOCGDLTLIST _IOWR('B',119, struct bpf_dltlist)
|
|
#define BIOCGSEESENT _IOR('B',120, u_int)
|
|
#define BIOCSSEESENT _IOW('B',121, u_int)
|
|
#define BIOCSRTIMEOUT _IOW('B',122, struct timeval)
|
|
#define BIOCGRTIMEOUT _IOR('B',123, struct timeval)
|
|
#define BIOCGFEEDBACK _IOR('B',124, u_int)
|
|
#define BIOCSFEEDBACK _IOW('B',125, u_int)
|
|
#define BIOCFEEDBACK BIOCSFEEDBACK /* FreeBSD name */
|
|
|
|
/*
|
|
* Structure prepended to each packet. This is "wire" format, so we
|
|
* cannot change it unfortunately to 64 bit times on 32 bit systems [yet].
|
|
*/
|
|
struct bpf_timeval {
|
|
long tv_sec;
|
|
long tv_usec;
|
|
};
|
|
|
|
struct bpf_hdr {
|
|
struct bpf_timeval bh_tstamp; /* time stamp */
|
|
uint32_t bh_caplen; /* length of captured portion */
|
|
uint32_t bh_datalen; /* original length of packet */
|
|
uint16_t bh_hdrlen; /* length of bpf header (this struct
|
|
plus alignment padding) */
|
|
};
|
|
/*
|
|
* Because the structure above is not a multiple of 4 bytes, some compilers
|
|
* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
|
|
* Only the kernel needs to know about it; applications use bh_hdrlen.
|
|
* XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
|
|
* XXX padding by using the size of the header data elements. This is
|
|
* XXX fail-safe: on new machines, we just use the 'safe' sizeof.
|
|
*/
|
|
#ifdef _KERNEL
|
|
#if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
|
|
defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \
|
|
defined(__sh__) || (defined(__sparc__) && !defined(__sparc64__))
|
|
#define SIZEOF_BPF_HDR 18
|
|
#else
|
|
#define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
|
|
#endif
|
|
#endif
|
|
|
|
/* Pull in data-link level type codes. */
|
|
#include <net/dlt.h>
|
|
|
|
/*
|
|
* The instruction encodings.
|
|
*/
|
|
/* instruction classes */
|
|
#define BPF_CLASS(code) ((code) & 0x07)
|
|
#define BPF_LD 0x00
|
|
#define BPF_LDX 0x01
|
|
#define BPF_ST 0x02
|
|
#define BPF_STX 0x03
|
|
#define BPF_ALU 0x04
|
|
#define BPF_JMP 0x05
|
|
#define BPF_RET 0x06
|
|
#define BPF_MISC 0x07
|
|
|
|
/* ld/ldx fields */
|
|
#define BPF_SIZE(code) ((code) & 0x18)
|
|
#define BPF_W 0x00
|
|
#define BPF_H 0x08
|
|
#define BPF_B 0x10
|
|
#define BPF_MODE(code) ((code) & 0xe0)
|
|
#define BPF_IMM 0x00
|
|
#define BPF_ABS 0x20
|
|
#define BPF_IND 0x40
|
|
#define BPF_MEM 0x60
|
|
#define BPF_LEN 0x80
|
|
#define BPF_MSH 0xa0
|
|
|
|
/* alu/jmp fields */
|
|
#define BPF_OP(code) ((code) & 0xf0)
|
|
#define BPF_ADD 0x00
|
|
#define BPF_SUB 0x10
|
|
#define BPF_MUL 0x20
|
|
#define BPF_DIV 0x30
|
|
#define BPF_OR 0x40
|
|
#define BPF_AND 0x50
|
|
#define BPF_LSH 0x60
|
|
#define BPF_RSH 0x70
|
|
#define BPF_NEG 0x80
|
|
#define BPF_JA 0x00
|
|
#define BPF_JEQ 0x10
|
|
#define BPF_JGT 0x20
|
|
#define BPF_JGE 0x30
|
|
#define BPF_JSET 0x40
|
|
#define BPF_SRC(code) ((code) & 0x08)
|
|
#define BPF_K 0x00
|
|
#define BPF_X 0x08
|
|
|
|
/* ret - BPF_K and BPF_X also apply */
|
|
#define BPF_RVAL(code) ((code) & 0x18)
|
|
#define BPF_A 0x10
|
|
|
|
/* misc */
|
|
#define BPF_MISCOP(code) ((code) & 0xf8)
|
|
#define BPF_TAX 0x00
|
|
#define BPF_TXA 0x80
|
|
|
|
/*
|
|
* The instruction data structure.
|
|
*/
|
|
struct bpf_insn {
|
|
uint16_t code;
|
|
u_char jt;
|
|
u_char jf;
|
|
uint32_t k;
|
|
};
|
|
|
|
/*
|
|
* Macros for insn array initializers.
|
|
*/
|
|
#define BPF_STMT(code, k) { (uint16_t)(code), 0, 0, k }
|
|
#define BPF_JUMP(code, k, jt, jf) { (uint16_t)(code), jt, jf, k }
|
|
|
|
/*
|
|
* Structure to retrieve available DLTs for the interface.
|
|
*/
|
|
struct bpf_dltlist {
|
|
u_int bfl_len; /* number of bfd_list array */
|
|
u_int *bfl_list; /* array of DLTs */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
#include <net/if.h>
|
|
struct bpf_if;
|
|
|
|
struct bpf_ops {
|
|
void (*bpf_attach)(struct ifnet *, u_int, u_int, struct bpf_if **);
|
|
void (*bpf_detach)(struct ifnet *);
|
|
void (*bpf_change_type)(struct ifnet *, u_int, u_int);
|
|
|
|
void (*bpf_tap)(struct bpf_if *, u_char *, u_int);
|
|
void (*bpf_mtap)(struct bpf_if *, struct mbuf *);
|
|
void (*bpf_mtap2)(struct bpf_if *, void *, u_int, struct mbuf *);
|
|
void (*bpf_mtap_af)(struct bpf_if *, uint32_t, struct mbuf *);
|
|
void (*bpf_mtap_sl_in)(struct bpf_if *, u_char *, struct mbuf **);
|
|
void (*bpf_mtap_sl_out)(struct bpf_if *, u_char *, struct mbuf *);
|
|
};
|
|
|
|
extern struct bpf_ops *bpf_ops;
|
|
|
|
static inline void
|
|
bpf_attach(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen)
|
|
{
|
|
bpf_ops->bpf_attach(_ifp, _dlt, _hdrlen, &_ifp->if_bpf);
|
|
}
|
|
|
|
static inline void
|
|
bpf_attach2(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen, struct bpf_if **_dp)
|
|
{
|
|
bpf_ops->bpf_attach(_ifp, _dlt, _hdrlen, _dp);
|
|
}
|
|
|
|
static inline void
|
|
bpf_tap(struct ifnet *_ifp, u_char *_pkt, u_int _len)
|
|
{
|
|
if (_ifp->if_bpf)
|
|
bpf_ops->bpf_tap(_ifp->if_bpf, _pkt, _len);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap(struct ifnet *_ifp, struct mbuf *_m)
|
|
{
|
|
if (_ifp->if_bpf)
|
|
bpf_ops->bpf_mtap(_ifp->if_bpf, _m);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap2(struct bpf_if *_bpf, void *_data, u_int _dlen, struct mbuf *_m)
|
|
{
|
|
bpf_ops->bpf_mtap2(_bpf, _data, _dlen, _m);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap3(struct bpf_if *_bpf, struct mbuf *_m)
|
|
{
|
|
if (_bpf)
|
|
bpf_ops->bpf_mtap(_bpf, _m);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap_af(struct ifnet *_ifp, uint32_t _af, struct mbuf *_m)
|
|
{
|
|
if (_ifp->if_bpf)
|
|
bpf_ops->bpf_mtap_af(_ifp->if_bpf, _af, _m);
|
|
}
|
|
|
|
static inline void
|
|
bpf_change_type(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen)
|
|
{
|
|
bpf_ops->bpf_change_type(_ifp, _dlt, _hdrlen);
|
|
}
|
|
|
|
static inline void
|
|
bpf_detach(struct ifnet *_ifp)
|
|
{
|
|
bpf_ops->bpf_detach(_ifp);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap_sl_in(struct ifnet *_ifp, u_char *_hdr, struct mbuf **_m)
|
|
{
|
|
bpf_ops->bpf_mtap_sl_in(_ifp->if_bpf, _hdr, _m);
|
|
}
|
|
|
|
static inline void
|
|
bpf_mtap_sl_out(struct ifnet *_ifp, u_char *_hdr, struct mbuf *_m)
|
|
{
|
|
if (_ifp->if_bpf)
|
|
bpf_ops->bpf_mtap_sl_out(_ifp->if_bpf, _hdr, _m);
|
|
}
|
|
|
|
|
|
void bpf_setops(void);
|
|
|
|
void bpf_ops_handover_enter(struct bpf_ops *);
|
|
void bpf_ops_handover_exit(void);
|
|
|
|
void bpfilterattach(int);
|
|
|
|
#endif
|
|
|
|
int bpf_validate(const struct bpf_insn *, int);
|
|
u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
|
|
|
|
/*
|
|
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
|
|
*/
|
|
#define BPF_MEMWORDS 16
|
|
|
|
#endif /* !_NET_BPF_H_ */
|