122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*-
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#ifdef _KERNEL
|
|
#include "opt_bpf.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/sysctl.h>
|
|
#else
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#include <net/bpf.h>
|
|
#include <net/bpf_jitter.h>
|
|
|
|
bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
|
|
|
|
static u_int bpf_jit_accept_all(u_char *, u_int, u_int);
|
|
|
|
#ifdef _KERNEL
|
|
MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
|
|
|
|
SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
|
|
int bpf_jitter_enable = 1;
|
|
SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
|
|
&bpf_jitter_enable, 0, "enable BPF JIT compiler");
|
|
#endif
|
|
|
|
bpf_jit_filter *
|
|
bpf_jitter(struct bpf_insn *fp, int nins)
|
|
{
|
|
bpf_jit_filter *filter;
|
|
|
|
/* Allocate the filter structure. */
|
|
#ifdef _KERNEL
|
|
filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
|
|
M_BPFJIT, M_NOWAIT);
|
|
#else
|
|
filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
|
|
#endif
|
|
if (filter == NULL)
|
|
return (NULL);
|
|
|
|
/* No filter means accept all. */
|
|
if (fp == NULL || nins == 0) {
|
|
filter->func = bpf_jit_accept_all;
|
|
return (filter);
|
|
}
|
|
|
|
/* Create the binary. */
|
|
if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) {
|
|
#ifdef _KERNEL
|
|
free(filter, M_BPFJIT);
|
|
#else
|
|
free(filter);
|
|
#endif
|
|
return (NULL);
|
|
}
|
|
|
|
return (filter);
|
|
}
|
|
|
|
void
|
|
bpf_destroy_jit_filter(bpf_jit_filter *filter)
|
|
{
|
|
|
|
#ifdef _KERNEL
|
|
if (filter->func != bpf_jit_accept_all)
|
|
free(filter->func, M_BPFJIT);
|
|
free(filter, M_BPFJIT);
|
|
#else
|
|
if (filter->func != bpf_jit_accept_all)
|
|
munmap(filter->func, filter->size);
|
|
free(filter);
|
|
#endif
|
|
}
|
|
|
|
static u_int
|
|
bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
|
|
__unused u_int buflen)
|
|
{
|
|
|
|
return ((u_int)-1);
|
|
}
|