112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/* Copyright (c) 2017 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <linux/bpf.h>
|
|
#include <string.h>
|
|
#include <linux/perf_event.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <stdbool.h>
|
|
#include <sys/resource.h>
|
|
#include "libbpf.h"
|
|
#include "bpf_load.h"
|
|
|
|
/* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*.
|
|
* This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
|
|
*/
|
|
|
|
static void usage(const char *cmd)
|
|
{
|
|
printf("USAGE: %s [-i num_progs] [-h]\n", cmd);
|
|
printf(" -i num_progs # number of progs of the test\n");
|
|
printf(" -h # help\n");
|
|
}
|
|
|
|
static void verify_map(int map_id)
|
|
{
|
|
__u32 key = 0;
|
|
__u32 val;
|
|
|
|
if (bpf_map_lookup_elem(map_id, &key, &val) != 0) {
|
|
fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
if (val == 0) {
|
|
fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
|
|
return;
|
|
}
|
|
val = 0;
|
|
if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) {
|
|
fprintf(stderr, "map_update failed: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int test(char *filename, int num_progs)
|
|
{
|
|
int i, fd, map0_fds[num_progs], map1_fds[num_progs];
|
|
|
|
for (i = 0; i < num_progs; i++) {
|
|
if (load_bpf_file(filename)) {
|
|
fprintf(stderr, "%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
printf("prog #%d: map ids %d %d\n", i, map_fd[0], map_fd[1]);
|
|
map0_fds[i] = map_fd[0];
|
|
map1_fds[i] = map_fd[1];
|
|
}
|
|
|
|
/* current load_bpf_file has perf_event_open default pid = -1
|
|
* and cpu = 0, which permits attached bpf execution on
|
|
* all cpus for all pid's. bpf program execution ignores
|
|
* cpu affinity.
|
|
*/
|
|
/* trigger some "open" operations */
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "open failed: %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
close(fd);
|
|
|
|
/* verify the map */
|
|
for (i = 0; i < num_progs; i++) {
|
|
verify_map(map0_fds[i]);
|
|
verify_map(map1_fds[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
|
int opt, num_progs = 1;
|
|
char filename[256];
|
|
|
|
while ((opt = getopt(argc, argv, "i:h")) != -1) {
|
|
switch (opt) {
|
|
case 'i':
|
|
num_progs = atoi(optarg);
|
|
break;
|
|
case 'h':
|
|
default:
|
|
usage(argv[0]);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
setrlimit(RLIMIT_MEMLOCK, &r);
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
|
|
return test(filename, num_progs);
|
|
}
|