ae275efcae
Use the following kernel configuration option to enable: options BPF_JITTER If you want to use bpf_filter() instead (e. g., debugging), do: sysctl net.bpf.jitter.enable=0 to turn it off. Currently BIOCSETWF and bpf_mtap2() are unsupported, and bpf_mtap() is partially supported because 1) no need, 2) avoid expensive m_copydata(9). Obtained from: WinPcap 3.1 (for i386)
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*-
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* Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy)
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* Copyright (c) 2005 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_bpf.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <net/bpf.h>
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#include <net/bpf_jitter.h>
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MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
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bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, int *);
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bpf_jit_filter *
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bpf_jitter(struct bpf_insn *fp, int nins)
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{
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bpf_jit_filter *filter;
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/* Allocate the filter structure */
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filter = (struct bpf_jit_filter *)malloc(sizeof(struct bpf_jit_filter),
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M_BPFJIT, M_WAITOK);
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if (filter == NULL)
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return NULL;
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/* Allocate the filter's memory */
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filter->mem = (int *)malloc(BPF_MEMWORDS * sizeof(int),
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M_BPFJIT, M_WAITOK);
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if (filter->mem == NULL) {
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free(filter, M_BPFJIT);
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return NULL;
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}
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/* Create the binary */
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if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
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free(filter->mem, M_BPFJIT);
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free(filter, M_BPFJIT);
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return NULL;
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}
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return filter;
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}
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void
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bpf_destroy_jit_filter(bpf_jit_filter *filter)
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{
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free(filter->mem, M_BPFJIT);
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free(filter->func, M_BPFJIT);
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free(filter, M_BPFJIT);
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}
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