1/*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifdef HAVE_CONFIG_H
29# include "config.h"
30#endif
31
32#include <stdio.h>
33#include <stdint.h>
34#include <unistd.h>
35#include <sys/syscall.h>
36
37#if defined HAVE_UNION_BPF_ATTR_LOG_BUF && defined __NR_bpf
38# include <linux/bpf.h>
39
40static const struct bpf_insn insns[] = {
41	{ .code = BPF_JMP | BPF_EXIT }
42};
43
44static char log_buf[4096];
45
46static int
47map_create(void)
48{
49	union bpf_attr attr = {
50		.key_size = 4,
51		.value_size = 8,
52		.max_entries = 256
53	};
54	return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
55}
56
57static int
58map_any(int cmd)
59{
60	union bpf_attr attr = {
61		.map_fd = -1,
62		.key = 0xdeadbeef,
63		.value = 0xbadc0ded
64	};
65	return syscall(__NR_bpf, cmd, &attr, sizeof(attr));
66}
67
68static int
69prog_load(void)
70{
71	union bpf_attr attr = {
72		.insn_cnt = sizeof(insns) / sizeof(insns[0]),
73		.insns = (unsigned long) insns,
74		.license = (unsigned long) "GPL",
75		.log_level = 42,
76		.log_size = sizeof(log_buf),
77		.log_buf = (unsigned long) log_buf
78	};
79	return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
80}
81
82int
83main(void)
84{
85	if (!map_create())
86		return 77;
87	printf("bpf\\(BPF_MAP_CREATE, "
88	       "\\{map_type=BPF_MAP_TYPE_UNSPEC, key_size=4, value_size=8, max_entries=256\\}, "
89	       "%u\\) += -1 .*\n",
90		(unsigned) sizeof(union bpf_attr));
91
92	if (!map_any(BPF_MAP_LOOKUP_ELEM))
93		return 77;
94	printf("bpf\\(BPF_MAP_LOOKUP_ELEM, "
95	       "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
96		(unsigned) sizeof(union bpf_attr));
97
98	if (!map_any(BPF_MAP_UPDATE_ELEM))
99		return 77;
100	printf("bpf\\(BPF_MAP_UPDATE_ELEM, "
101	       "\\{map_fd=-1, key=0xdeadbeef, value=0xbadc0ded, flags=BPF_ANY\\}, "
102	       "%u\\) += -1 .*\n",
103		(unsigned) sizeof(union bpf_attr));
104
105	if (!map_any(BPF_MAP_DELETE_ELEM))
106		return 77;
107	printf("bpf\\(BPF_MAP_DELETE_ELEM, "
108	       "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
109		(unsigned) sizeof(union bpf_attr));
110
111	if (!map_any(BPF_MAP_GET_NEXT_KEY))
112		return 77;
113	printf("bpf\\(BPF_MAP_GET_NEXT_KEY, "
114	       "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
115		(unsigned) sizeof(union bpf_attr));
116
117	if (!prog_load())
118		return 77;
119	printf("bpf\\(BPF_PROG_LOAD, "
120	       "\\{prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=1, insns=%p, "
121	       "license=\"GPL\", log_level=42, log_size=4096, log_buf=%p, "
122	       "kern_version=0\\}, %u\\) += -1 .*\n",
123		insns, log_buf, (unsigned) sizeof(union bpf_attr));
124
125	return 0;
126}
127
128#else
129
130int
131main(void)
132{
133	return 77;
134}
135
136#endif
137