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NetBSD/sys/net/bpf.h
bouyer ccc8030189 Provide netbsd32 compat for bpf. Beside the ioctls, the structure 
returned to userland by read(2) also needs to be converted.
For this, the bpf descriptor is flagged as compat32 (or not) in the
open and ioctl functions (where the user process's pid is also updated
in the descriptor). When the bpf buffer is filled in, the 32bits or native
header is used depending on the information stored in the descriptor.

This won't work if a 64bit binary does the open and ioctls, and then
exec a 32bit program which will do the read. But this is very
unlikely to happen in real life ...

Tested on i386 and loongson; with these changes my loongson can run
dhclient and tcpdump with a n32 userland.
2011-08-30 14:22:22 +00:00

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/* $NetBSD: bpf.h,v 1.58 2011/08/30 14:22:22 bouyer 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_ALIGNMENT32 sizeof(int)
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
#define BPF_WORDALIGN32(x) (((x)+(BPF_ALIGNMENT32-1))&~(BPF_ALIGNMENT32-1))
#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_timeval32 {
int32_t tv_sec;
int32_t 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) */
};
struct bpf_hdr32 {
struct bpf_timeval32 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
#define SIZEOF_BPF_HDR32 18
#else
#define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
#define SIZEOF_BPF_HDR32 sizeof(struct bpf_hdr32)
#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_ */
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