forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
2.4 KiB
113 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* Copyright (c) 2016 Sargun Dhillon <[email protected]> |
|
*/ |
|
|
|
#define _GNU_SOURCE |
|
#include <stdio.h> |
|
#include <unistd.h> |
|
#include <bpf/bpf.h> |
|
#include <bpf/libbpf.h> |
|
#include "cgroup_helpers.h" |
|
|
|
#define CGROUP_PATH "/my-cgroup" |
|
|
|
int main(int argc, char **argv) |
|
{ |
|
pid_t remote_pid, local_pid = getpid(); |
|
struct bpf_link *link = NULL; |
|
struct bpf_program *prog; |
|
int cg2, idx = 0, rc = 1; |
|
struct bpf_object *obj; |
|
char filename[256]; |
|
int map_fd[2]; |
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
|
obj = bpf_object__open_file(filename, NULL); |
|
if (libbpf_get_error(obj)) { |
|
fprintf(stderr, "ERROR: opening BPF object file failed\n"); |
|
return 0; |
|
} |
|
|
|
prog = bpf_object__find_program_by_name(obj, "bpf_prog1"); |
|
if (!prog) { |
|
printf("finding a prog in obj file failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
/* load BPF program */ |
|
if (bpf_object__load(obj)) { |
|
fprintf(stderr, "ERROR: loading BPF object file failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
map_fd[0] = bpf_object__find_map_fd_by_name(obj, "cgroup_map"); |
|
map_fd[1] = bpf_object__find_map_fd_by_name(obj, "perf_map"); |
|
if (map_fd[0] < 0 || map_fd[1] < 0) { |
|
fprintf(stderr, "ERROR: finding a map in obj file failed\n"); |
|
goto cleanup; |
|
} |
|
|
|
link = bpf_program__attach(prog); |
|
if (libbpf_get_error(link)) { |
|
fprintf(stderr, "ERROR: bpf_program__attach failed\n"); |
|
link = NULL; |
|
goto cleanup; |
|
} |
|
|
|
if (setup_cgroup_environment()) |
|
goto err; |
|
|
|
cg2 = create_and_get_cgroup(CGROUP_PATH); |
|
|
|
if (cg2 < 0) |
|
goto err; |
|
|
|
if (bpf_map_update_elem(map_fd[0], &idx, &cg2, BPF_ANY)) { |
|
log_err("Adding target cgroup to map"); |
|
goto err; |
|
} |
|
|
|
if (join_cgroup(CGROUP_PATH)) |
|
goto err; |
|
|
|
/* |
|
* The installed helper program catched the sync call, and should |
|
* write it to the map. |
|
*/ |
|
|
|
sync(); |
|
bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid); |
|
|
|
if (local_pid != remote_pid) { |
|
fprintf(stderr, |
|
"BPF Helper didn't write correct PID to map, but: %d\n", |
|
remote_pid); |
|
goto err; |
|
} |
|
|
|
/* Verify the negative scenario; leave the cgroup */ |
|
if (join_cgroup("/")) |
|
goto err; |
|
|
|
remote_pid = 0; |
|
bpf_map_update_elem(map_fd[1], &idx, &remote_pid, BPF_ANY); |
|
|
|
sync(); |
|
bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid); |
|
|
|
if (local_pid == remote_pid) { |
|
fprintf(stderr, "BPF cgroup negative test did not work\n"); |
|
goto err; |
|
} |
|
|
|
rc = 0; |
|
|
|
err: |
|
close(cg2); |
|
cleanup_cgroup_environment(); |
|
|
|
cleanup: |
|
bpf_link__destroy(link); |
|
bpf_object__close(obj); |
|
return rc; |
|
}
|
|
|