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bpfjit.h
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bpfjit.h
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/*-
* Copyright (c) 2011-2013 Alexander Nasonov.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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.
*/
#ifndef _NET_BPFJIT_H_
#define _NET_BPFJIT_H_
#ifndef _KERNEL
#include <stddef.h>
#include <stdint.h>
#endif
#include <sys/types.h>
#ifdef __linux
#include <pcap-bpf.h>
#else
#include <net/bpf.h>
#endif
/* Compat definitions. */
#ifndef BPF_COP
#define BPF_COP 0x20
#define BPF_COPX 0x40
#endif
struct bpf_ctx;
typedef struct bpf_ctx bpf_ctx_t;
struct bpf_state;
typedef struct bpf_state bpf_state_t;
struct bpf_args;
typedef struct bpf_args bpf_args_t;
typedef uint32_t (*bpf_copfunc_t)(bpf_ctx_t *, bpf_args_t *, bpf_state_t *);
struct bpf_args {
const uint8_t * pkt;
size_t wirelen;
size_t buflen;
void * arg;
};
struct bpf_ctx {
const bpf_copfunc_t * copfuncs;
size_t nfuncs;
};
struct bpf_state {
uint32_t mem[BPF_MEMWORDS];
uint32_t regA;
};
typedef size_t (*bpfjit_function_t)(bpf_ctx_t *, bpf_args_t *);
bpfjit_function_t
bpfjit_generate_code(bpf_ctx_t *, struct bpf_insn *, size_t);
void
bpfjit_free_code(bpfjit_function_t code);
static inline size_t
bpfjit_call(bpfjit_function_t f, const uint8_t *p,
unsigned int wirelen, unsigned int buflen)
{
bpf_args_t args;
args.pkt = p;
args.wirelen = wirelen;
args.buflen = buflen;
return f(NULL, &args);
}
#endif /* !_NET_BPFJIT_H_ */