51369649b0
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
120 lines
3.3 KiB
C
120 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) 2005-2017 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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#ifdef _KERNEL
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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 <sys/sysctl.h>
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#else
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#endif
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#include <net/bpf.h>
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#include <net/bpf_jitter.h>
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static u_int bpf_jit_accept_all(u_char *, u_int, u_int);
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#ifdef _KERNEL
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MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
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SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
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int bpf_jitter_enable = 1;
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SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
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&bpf_jitter_enable, 0, "enable BPF JIT compiler");
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#endif
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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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#ifdef _KERNEL
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filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
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M_BPFJIT, M_NOWAIT);
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#else
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filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
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#endif
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if (filter == NULL)
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return (NULL);
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/* No filter means accept all. */
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if (fp == NULL || nins == 0) {
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filter->func = bpf_jit_accept_all;
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return (filter);
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}
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/* Create the binary. */
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if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) {
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#ifdef _KERNEL
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free(filter, M_BPFJIT);
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#else
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free(filter);
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#endif
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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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if (filter->func != bpf_jit_accept_all)
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bpf_jit_free(filter->func, filter->size);
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#ifdef _KERNEL
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free(filter, M_BPFJIT);
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#else
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free(filter);
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#endif
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}
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static u_int
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bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
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__unused u_int buflen)
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{
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return ((u_int)-1);
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}
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