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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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/12.0/sys/net/bpf_jitter.h 335068 2018-06-13 17:04:41Z jtl $
     */
    
    #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);
    
    /*
     * Declarations for machine-dependent functions.
     */
    struct bpf_insn;
    
    bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
    
    #endif  /* _NET_BPF_JITTER_H_ */

Cache object: 8f1d90adf82e5ceb96a6c38b4a2d5cf6