sys/net/bpfjit.h

   1 /*      $NetBSD: bpfjit.h,v 1.4 2014/06/25 19:32:37 alnsn Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2011-2014 Alexander Nasonov.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef _NET_BPFJIT_H_
  33 #define _NET_BPFJIT_H_
  34
  35 #ifndef _KERNEL
  36 #include <stddef.h>
  37 #include <stdint.h>
  38 #endif
  39
  40 #include <sys/types.h>
  41
  42 #ifdef __linux
  43 #include <pcap-bpf.h>
  44 #else
  45 #include <net/bpf.h>
  46 #endif
  47
  48 /*
  49  * Return value of a function generated by sljit have sljit_uw type
  50  * which can have a greater width. In such cases, we rely on the fact
  51  * that calling conventions use same registers for smaller types.
  52  * SLJIT_MOV_UI is passed to sljit_emit_return() to make sure that the
  53  * return value is truncated to unsigned int.
  54  */
  55 typedef unsigned int (*bpfjit_func_t)(const bpf_ctx_t *, bpf_args_t *);
  56
  57 bpfjit_func_t bpfjit_generate_code(const bpf_ctx_t *,
  58     const struct bpf_insn *, size_t);
  59 void bpfjit_free_code(bpfjit_func_t);
  60
  61 #ifdef _KERNEL
  62 struct bpfjit_ops {
  63         bpfjit_func_t (*bj_generate_code)(const bpf_ctx_t *,
  64             const struct bpf_insn *, size_t);
  65         void (*bj_free_code)(bpfjit_func_t);
  66 };
  67
  68 extern struct bpfjit_ops bpfjit_module_ops;
  69 #endif
  70
  71 #endif /* !_NET_BPFJIT_H_ */