text: /*-
   * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
   * Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
   * 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.
   * 3. Neither the name of the Politecnico di Torino 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 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
   * OWNER 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.
   *
   * $FreeBSD: releng/9.3/sys/net/bpf_jitter.h 199603 2009-11-20 18:49:20Z jkim $
   */
  
  #ifndef _NET_BPF_JITTER_H_
  #define _NET_BPF_JITTER_H_
  
  #ifdef _KERNEL
  MALLOC_DECLARE(M_BPFJIT);
  #endif
  
  extern int bpf_jitter_enable;
  
  /*
   * Prototype of a filtering function created by the jitter.
   *
   * The syntax and the meaning of the parameters is analogous to the one of
   * bpf_filter(). Notice that the filter is not among the parameters because
   * it is hardwired in the function.
   */
  typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
  
  /* Structure describing a native filtering program created by the jitter. */
  typedef struct bpf_jit_filter {
  	/* The native filtering binary, in the form of a bpf_filter_func. */
  	bpf_filter_func	func;
  	size_t		size;
  } bpf_jit_filter;
  
  /*
   * BPF jitter, builds a machine function from a BPF program.
   *
   * param fp	The BPF pseudo-assembly filter that will be translated
   *		into native code.
   * param nins	Number of instructions of the input filter.
   * return	The bpf_jit_filter structure containing the native filtering
   *		binary.
   *
   * bpf_jitter allocates the buffers for the new native filter and
   * then translates the program pointed by fp calling bpf_jit_compile().
   */
  bpf_jit_filter	*bpf_jitter(struct bpf_insn *fp, int nins);
  
  /*
   * Deletes a filtering function that was previously created by bpf_jitter().
   *
   * param filter	The filter to destroy.
   *
   * This function frees the variuos buffers (code, memory, etc.) associated
   * with a filtering function.
   */
  void		bpf_destroy_jit_filter(bpf_jit_filter *filter);
  
  #endif	/* _NET_BPF_JITTER_H_ */
  