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91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
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* Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _NET_BPF_JITTER_H_
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#define _NET_BPF_JITTER_H_
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#ifdef _KERNEL
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MALLOC_DECLARE(M_BPFJIT);
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#endif
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extern int bpf_jitter_enable;
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/*
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* Prototype of a filtering function created by the jitter.
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*
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* The syntax and the meaning of the parameters is analogous to the one of
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* bpf_filter(). Notice that the filter is not among the parameters because
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* it is hardwired in the function.
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*/
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typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
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/* Structure describing a native filtering program created by the jitter. */
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typedef struct bpf_jit_filter {
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/* The native filtering binary, in the form of a bpf_filter_func. */
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bpf_filter_func func;
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size_t size;
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} bpf_jit_filter;
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/*
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* BPF jitter, builds a machine function from a BPF program.
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*
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* param fp The BPF pseudo-assembly filter that will be translated
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* into native code.
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* param nins Number of instructions of the input filter.
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* return The bpf_jit_filter structure containing the native filtering
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* binary.
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*
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* bpf_jitter allocates the buffers for the new native filter and
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* then translates the program pointed by fp calling bpf_jit_compile().
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*/
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bpf_jit_filter *bpf_jitter(struct bpf_insn *fp, int nins);
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/*
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* Deletes a filtering function that was previously created by bpf_jitter().
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*
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* param filter The filter to destroy.
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*
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* This function frees the variuos buffers (code, memory, etc.) associated
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* with a filtering function.
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*/
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void bpf_destroy_jit_filter(bpf_jit_filter *filter);
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/*
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* Declarations for machine-dependent functions.
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*/
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struct bpf_insn;
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bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
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#endif /* _NET_BPF_JITTER_H_ */
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