1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*-
* Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
* Copyright (C) 2005-2008 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 <string.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, int *);
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");
bpf_jit_filter *
bpf_jitter(struct bpf_insn *fp, int nins)
{
bpf_jit_filter *filter;
/* Allocate the filter structure */
filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
M_BPFJIT, M_NOWAIT | M_ZERO);
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->mem)) == NULL) {
free(filter, M_BPFJIT);
return (NULL);
}
return (filter);
}
void
bpf_destroy_jit_filter(bpf_jit_filter *filter)
{
if (filter->func != bpf_jit_accept_all)
free(filter->func, M_BPFJIT);
free(filter, M_BPFJIT);
}
#else
bpf_jit_filter *
bpf_jitter(struct bpf_insn *fp, int nins)
{
bpf_jit_filter *filter;
/* Allocate the filter structure */
filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
if (filter == NULL)
return (NULL);
memset(filter, 0, sizeof(*filter));
/* 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->mem)) == NULL) {
free(filter);
return (NULL);
}
return (filter);
}
void
bpf_destroy_jit_filter(bpf_jit_filter *filter)
{
if (filter->func != bpf_jit_accept_all)
free(filter->func);
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);
}
|
