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bpfjit.h revision 1.2 
      1 /*	$NetBSD: bpfjit.h,v 1.2 2013/11/15 00:12:44 rmind Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011-2012 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 and arguments of a function generated by sljit have sljit_uw
     50  * type which can have a greater width than arguments below. In such cases,
     51  * we rely on the fact that calling conventions use same registers for
     52  * smaller types.
     53  * SLJIT_MOV_UI is passed to sljit_emit_return() to make sure that the
     54  * return value is truncated to unsigned int.
     55  */
     56 typedef unsigned int (*bpfjit_func_t)(const uint8_t *,
     57     unsigned int, unsigned int);
     58 
     59 bpfjit_func_t bpfjit_generate_code(bpf_ctx_t *, struct bpf_insn *, size_t);
     60 void bpfjit_free_code(bpfjit_func_t);
     61 
     62 #ifdef _KERNEL
     63 struct bpfjit_ops {
     64 	bpfjit_func_t (*bj_generate_code)(bpf_ctx_t *, 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_ */
     72