1/*-
2 * Copyright (C) 2008 Jung-uk Kim <jkim@FreeBSD.org>. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/tools/regression/bpf/bpf_filter/bpf_test.c 182185 2008-08-26 00:35:04Z jkim $");
28
29#include <signal.h>
30#include <stdio.h>
31#include <stdlib.h>
32
33#include <sys/types.h>
34
35#include <net/bpf.h>
36
37#include BPF_TEST_H
38
39#define PASSED 0
40#define FAILED 1
41#define FATAL -1
42
43#ifndef LOG_LEVEL
44#define LOG_LEVEL 1
45#endif
46
47#ifdef BPF_BENCHMARK
48#define BPF_NRUNS 10000000
49#else
50#define BPF_NRUNS 1
51#endif
52
53static void sig_handler(int);
54
55#if defined(BPF_JIT_COMPILER) || defined(BPF_VALIDATE)
56static int nins = sizeof(pc) / sizeof(pc[0]);
57#endif
58
59static int verbose = LOG_LEVEL;
60
61#ifdef BPF_JIT_COMPILER
62
63#include <net/bpf_jitter.h>
64
65static u_int
66bpf_compile_and_filter(void)
67{
68 bpf_jit_filter *filter;
69 u_int i, ret;
70
71 /* Do not use BPF JIT compiler for an empty program */
72 if (nins == 0)
73 return (0);
74
75 /* Compile the BPF filter program and generate native code. */
76 if ((filter = bpf_jitter(pc, nins)) == NULL) {
77 if (verbose > 1)
78 printf("Failed to allocate memory:\t");
79 if (verbose > 0)
80 printf("FATAL\n");
81 exit(FATAL);
82 }
83
84 for (i = 0; i < BPF_NRUNS; i++)
85 ret = (*(filter->func))(pkt, wirelen, buflen);
86
87 bpf_destroy_jit_filter(filter);
88
89 return (ret);
90}
91
92#endif
93
94#ifdef BPF_VALIDATE
95/*
96 * XXX Copied from sys/net/bpf_filter.c and modified.
97 *
98 * Return true if the 'fcode' is a valid filter program.
99 * The constraints are that each jump be forward and to a valid
100 * code. The code must terminate with either an accept or reject.
101 *
102 * The kernel needs to be able to verify an application's filter code.
103 * Otherwise, a bogus program could easily crash the system.
104 */
105static int
106bpf_validate(const struct bpf_insn *f, int len)
107{
108 register int i;
109 register const struct bpf_insn *p;
110
111 /* Do not accept negative length filter. */
112 if (len < 0)
113 return (0);
114
115 /* An empty filter means accept all. */
116 if (len == 0)
117 return (1);
118
119 for (i = 0; i < len; ++i) {
120 /*
121 * Check that that jumps are forward, and within
122 * the code block.
123 */
124 p = &f[i];
125 if (BPF_CLASS(p->code) == BPF_JMP) {
126 register int from = i + 1;
127
128 if (BPF_OP(p->code) == BPF_JA) {
129 if (from >= len || p->k >= (u_int)len - from)
130 return (0);
131 }
132 else if (from >= len || p->jt >= len - from ||
133 p->jf >= len - from)
134 return (0);
135 }
136 /*
137 * Check that memory operations use valid addresses.
138 */
139 if ((BPF_CLASS(p->code) == BPF_ST ||
140 (BPF_CLASS(p->code) == BPF_LD &&
141 (p->code & 0xe0) == BPF_MEM)) &&
142 p->k >= BPF_MEMWORDS)
143 return (0);
144 /*
145 * Check for constant division by 0.
146 */
147 if (p->code == (BPF_ALU|BPF_DIV|BPF_K) && p->k == 0)
148 return (0);
149 }
150 return (BPF_CLASS(f[len - 1].code) == BPF_RET);
151}
152#endif
153
154int
155main(void)
156{
157#ifndef BPF_JIT_COMPILER
158 u_int i;
159#endif
160 u_int ret;
161 int sig;
162#ifdef BPF_VALIDATE
163 int valid;
164#endif
165
166 /* Try to catch all signals */
167 for (sig = SIGHUP; sig <= SIGUSR2; sig++)
168 signal(sig, sig_handler);
169
170#ifdef BPF_VALIDATE
171 valid = bpf_validate(pc, nins);
172 if (valid != 0 && invalid != 0) {
173 if (verbose > 1)
174 printf("Validated invalid instructions:\t");
175 if (verbose > 0)
176 printf("FAILED\n");
177 return (FAILED);
178 } else if (valid == 0 && invalid == 0) {
179 if (verbose > 1)
180 printf("Invalidated valid instructions:\t");
181 if (verbose > 0)
182 printf("FAILED\n");
183 return (FAILED);
184 }
185#endif
186
187#ifdef BPF_JIT_COMPILER
188 ret = bpf_compile_and_filter();
189#else
190 for (i = 0; i < BPF_NRUNS; i++)
191 ret = bpf_filter(pc, pkt, wirelen, buflen);
192#endif
193 if (ret != expect) {
194 if (verbose > 1)
195 printf("Expected 0x%x but got 0x%x:\t", expect, ret);
196 if (verbose > 0)
197 printf("FAILED\n");
198 return (FAILED);
199 }
200 if (verbose > 1)
201 printf("Expected and got 0x%x:\t", ret);
202 if (verbose > 0)
203 printf("PASSED\n");
204
205 return (PASSED);
206}
207
208static void
209sig_handler(int sig)
210{
211
212 if (expect_signal == 0) {
213 if (verbose > 1)
214 printf("Received unexpected signal %d:\t", sig);
215 if (verbose > 0)
216 printf("FATAL\n");
217 exit(FATAL);
218 }
219 if (expect_signal != sig) {
220 if (verbose > 1)
221 printf("Expected signal %d but got %d:\t",
222 expect_signal, sig);
223 if (verbose > 0)
224 printf("FAILED\n");
225 exit(FAILED);
226 }
227
228 if (verbose > 1)
229 printf("Expected and got signal %d:\t", sig);
230 if (verbose > 0)
231 printf("PASSED\n");
232
233 exit(PASSED);
234}