Dmitry V. Levin
4e3ded36ef
* configure.ac: Check how union bpf_attr.log_buf initialization works. * tests/bpf.c: Check for HAVE_UNION_BPF_ATTR_LOG_BUF.
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#if defined HAVE_UNION_BPF_ATTR_LOG_BUF && defined __NR_bpf
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# include <linux/bpf.h>
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static const struct bpf_insn insns[] = {
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{ .code = BPF_JMP | BPF_EXIT }
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};
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static char log_buf[4096];
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static int
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map_create(void)
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{
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union bpf_attr attr = {
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.key_size = 4,
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.value_size = 8,
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.max_entries = 256
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};
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return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
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}
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static int
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map_any(int cmd)
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{
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union bpf_attr attr = {
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.map_fd = -1,
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.key = 0xdeadbeef,
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.value = 0xbadc0ded
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};
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return syscall(__NR_bpf, cmd, &attr, sizeof(attr));
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}
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static int
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prog_load(void)
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{
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union bpf_attr attr = {
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.insn_cnt = sizeof(insns) / sizeof(insns[0]),
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.insns = (unsigned long) insns,
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.license = (unsigned long) "GPL",
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.log_level = 42,
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.log_size = sizeof(log_buf),
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.log_buf = (unsigned long) log_buf
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};
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return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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}
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int
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main(void)
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{
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if (!map_create())
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return 77;
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printf("bpf\\(BPF_MAP_CREATE, "
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"\\{map_type=BPF_MAP_TYPE_UNSPEC, key_size=4, value_size=8, max_entries=256\\}, "
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"%u\\) += -1 .*\n",
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(unsigned) sizeof(union bpf_attr));
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if (!map_any(BPF_MAP_LOOKUP_ELEM))
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return 77;
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printf("bpf\\(BPF_MAP_LOOKUP_ELEM, "
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"\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
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(unsigned) sizeof(union bpf_attr));
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if (!map_any(BPF_MAP_UPDATE_ELEM))
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return 77;
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printf("bpf\\(BPF_MAP_UPDATE_ELEM, "
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"\\{map_fd=-1, key=0xdeadbeef, value=0xbadc0ded, flags=BPF_ANY\\}, "
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"%u\\) += -1 .*\n",
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(unsigned) sizeof(union bpf_attr));
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if (!map_any(BPF_MAP_DELETE_ELEM))
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return 77;
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printf("bpf\\(BPF_MAP_DELETE_ELEM, "
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"\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
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(unsigned) sizeof(union bpf_attr));
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if (!map_any(BPF_MAP_GET_NEXT_KEY))
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return 77;
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printf("bpf\\(BPF_MAP_GET_NEXT_KEY, "
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"\\{map_fd=-1, key=0xdeadbeef\\}, %u\\) += -1 .*\n",
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(unsigned) sizeof(union bpf_attr));
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if (!prog_load())
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return 77;
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printf("bpf\\(BPF_PROG_LOAD, "
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"\\{prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=1, insns=%p, "
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"license=\"GPL\", log_level=42, log_size=4096, log_buf=%p, "
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"kern_version=0\\}, %u\\) += -1 .*\n",
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insns, log_buf, (unsigned) sizeof(union bpf_attr));
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return 0;
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}
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#else
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int
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main(void)
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{
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return 77;
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}
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#endif
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