The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/bpf_jitter.h

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    1 /*-
    2  * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
    3  * Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  * notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  * notice, this list of conditions and the following disclaimer in the
   14  * documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the Politecnico di Torino nor the names of its
   16  * contributors may be used to endorse or promote products derived from
   17  * this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $FreeBSD: releng/10.1/sys/net/bpf_jitter.h 199603 2009-11-20 18:49:20Z jkim $
   32  */
   33 
   34 #ifndef _NET_BPF_JITTER_H_
   35 #define _NET_BPF_JITTER_H_
   36 
   37 #ifdef _KERNEL
   38 MALLOC_DECLARE(M_BPFJIT);
   39 #endif
   40 
   41 extern int bpf_jitter_enable;
   42 
   43 /*
   44  * Prototype of a filtering function created by the jitter.
   45  *
   46  * The syntax and the meaning of the parameters is analogous to the one of
   47  * bpf_filter(). Notice that the filter is not among the parameters because
   48  * it is hardwired in the function.
   49  */
   50 typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
   51 
   52 /* Structure describing a native filtering program created by the jitter. */
   53 typedef struct bpf_jit_filter {
   54         /* The native filtering binary, in the form of a bpf_filter_func. */
   55         bpf_filter_func func;
   56         size_t          size;
   57 } bpf_jit_filter;
   58 
   59 /*
   60  * BPF jitter, builds a machine function from a BPF program.
   61  *
   62  * param fp     The BPF pseudo-assembly filter that will be translated
   63  *              into native code.
   64  * param nins   Number of instructions of the input filter.
   65  * return       The bpf_jit_filter structure containing the native filtering
   66  *              binary.
   67  *
   68  * bpf_jitter allocates the buffers for the new native filter and
   69  * then translates the program pointed by fp calling bpf_jit_compile().
   70  */
   71 bpf_jit_filter  *bpf_jitter(struct bpf_insn *fp, int nins);
   72 
   73 /*
   74  * Deletes a filtering function that was previously created by bpf_jitter().
   75  *
   76  * param filter The filter to destroy.
   77  *
   78  * This function frees the variuos buffers (code, memory, etc.) associated
   79  * with a filtering function.
   80  */
   81 void            bpf_destroy_jit_filter(bpf_jit_filter *filter);
   82 
   83 #endif  /* _NET_BPF_JITTER_H_ */

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