2 * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the Politecnico di Torino nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
42 #include <sys/sysctl.h>
46 #include <sys/param.h>
47 #include <sys/types.h>
51 #include <net/bpf_jitter.h>
53 bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
55 static u_int bpf_jit_accept_all(u_char *, u_int, u_int);
58 MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
60 SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
61 int bpf_jitter_enable = 1;
62 SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
63 &bpf_jitter_enable, 0, "enable BPF JIT compiler");
67 bpf_jitter(struct bpf_insn *fp, int nins)
69 bpf_jit_filter *filter;
71 /* Allocate the filter structure. */
73 filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
76 filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
81 /* No filter means accept all. */
82 if (fp == NULL || nins == 0) {
83 filter->func = bpf_jit_accept_all;
87 /* Create the binary. */
88 if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) {
90 free(filter, M_BPFJIT);
101 bpf_destroy_jit_filter(bpf_jit_filter *filter)
105 if (filter->func != bpf_jit_accept_all)
106 free(filter->func, M_BPFJIT);
107 free(filter, M_BPFJIT);
109 if (filter->func != bpf_jit_accept_all)
110 munmap(filter->func, filter->size);
116 bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
117 __unused u_int buflen)