2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
32 #include <sys/syscall.h>
34 #if defined HAVE_UNION_BPF_ATTR_LOG_BUF && defined __NR_bpf
35 # include <linux/bpf.h>
37 static const struct bpf_insn insns[] = {
38 { .code = BPF_JMP | BPF_EXIT }
41 static char log_buf[4096];
46 union bpf_attr attr = {
51 return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
57 union bpf_attr attr = {
62 return syscall(__NR_bpf, cmd, &attr, sizeof(attr));
68 union bpf_attr attr = {
69 .insn_cnt = sizeof(insns) / sizeof(insns[0]),
70 .insns = (unsigned long) insns,
71 .license = (unsigned long) "GPL",
73 .log_size = sizeof(log_buf),
74 .log_buf = (unsigned long) log_buf
76 return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
84 printf("bpf\\(BPF_MAP_CREATE, "
85 "\\{map_type=BPF_MAP_TYPE_UNSPEC, key_size=4, value_size=8, max_entries=256\\}, "
87 (unsigned) sizeof(union bpf_attr));
89 if (!map_any(BPF_MAP_LOOKUP_ELEM))
91 printf("bpf\\(BPF_MAP_LOOKUP_ELEM, "
92 "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
93 (unsigned) sizeof(union bpf_attr));
95 if (!map_any(BPF_MAP_UPDATE_ELEM))
97 printf("bpf\\(BPF_MAP_UPDATE_ELEM, "
98 "\\{map_fd=-1, key=0xdeadbeef, value=0xbadc0ded, flags=BPF_ANY\\}, "
100 (unsigned) sizeof(union bpf_attr));
102 if (!map_any(BPF_MAP_DELETE_ELEM))
104 printf("bpf\\(BPF_MAP_DELETE_ELEM, "
105 "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
106 (unsigned) sizeof(union bpf_attr));
108 if (!map_any(BPF_MAP_GET_NEXT_KEY))
110 printf("bpf\\(BPF_MAP_GET_NEXT_KEY, "
111 "\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
112 (unsigned) sizeof(union bpf_attr));
116 printf("bpf\\(BPF_PROG_LOAD, "
117 "\\{prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=1, insns=%p, "
118 "license=\"GPL\", log_level=42, log_size=4096, log_buf=%p, "
119 "kern_version=0\\}, %u\\) += -1 .*\n",
120 insns, log_buf, (unsigned) sizeof(union bpf_attr));