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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/bpf_insn.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include "bpf-foreign.h"
#include "load-fragment.h"
#include "manager.h"
#include "process-util.h"
#include "rlimit-util.h"
#include "rm-rf.h"
#include "service.h"
#include "tests.h"
#include "unit.h"
#include "virt.h"
struct Test {
const char *option_name;
enum bpf_prog_type prog_type;
enum bpf_attach_type attach_type;
const char *bpffs_path;
};
typedef struct Test Test;
#define BPFFS_PATH(prog_suffix) ("/sys/fs/bpf/test-bpf-foreing-" # prog_suffix)
static const Test single_prog[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_INGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
},
};
static const Test path_split_test[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_INGRESS,
.bpffs_path = BPFFS_PATH("path:split:test"),
},
};
static const Test same_prog_same_hook[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
.bpffs_path = BPFFS_PATH("trivial-sock"),
},
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
.bpffs_path = BPFFS_PATH("trivial-sock"),
}
};
static const Test multi_prog_same_hook[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
.bpffs_path = BPFFS_PATH("trivial-sock-0"),
},
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
.bpffs_path = BPFFS_PATH("trivial-sock-1"),
}
};
static const Test same_prog_multi_hook[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_INGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
},
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_EGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
}
};
static const Test same_prog_multi_option_0[] = {
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_INGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
},
{
.option_name = "IPIngressFilterPath",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_INGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
}
};
static const Test same_prog_multi_option_1[] = {
{
.option_name = "IPEgressFilterPath",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_EGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
},
{
.option_name = "BPFProgram",
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.attach_type = BPF_CGROUP_INET_EGRESS,
.bpffs_path = BPFFS_PATH("trivial-skb"),
}
};
#undef BPFFS_PATH
static int bpf_foreign_test_to_string(enum bpf_attach_type attach_type, const char *bpffs_path, char **ret_str) {
const char *s = NULL;
assert_se(bpffs_path);
assert_se(ret_str);
assert_se(s = bpf_cgroup_attach_type_to_string(attach_type));
assert_se(*ret_str = strjoin(s, ":", bpffs_path));
return 0;
}
static char **unlink_paths_and_free(char **paths) {
char **i;
STRV_FOREACH(i, paths)
(void) unlink(*i);
return strv_free(paths);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char **, unlink_paths_and_free);
static int pin_programs(Unit *u, CGroupContext *cc, const Test *test_suite, size_t test_suite_size, char ***paths_ret) {
_cleanup_(unlink_paths_and_freep) char **bpffs_paths = NULL;
static const struct bpf_insn trivial[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN()
};
char log_buf[0xffff];
int r;
assert_se(paths_ret);
for (size_t i = 0; i < test_suite_size; i++) {
_cleanup_(bpf_program_freep) BPFProgram *prog = NULL;
_cleanup_free_ char *str = NULL;
r = bpf_foreign_test_to_string(test_suite[i].attach_type, test_suite[i].bpffs_path, &str);
if (r < 0)
return log_error_errno(r, "Failed to convert program to string");
r = bpf_program_new(test_suite[i].prog_type, &prog);
if (r < 0)
return log_error_errno(r, "Failed to create program '%s'", str);
r = bpf_program_add_instructions(prog, trivial, ELEMENTSOF(trivial));
if (r < 0)
return log_error_errno(r, "Failed to add trivial instructions for '%s'", str);
r = bpf_program_load_kernel(prog, log_buf, ELEMENTSOF(log_buf));
if (r < 0)
return log_error_errno(r, "Failed to load BPF program '%s'", str);
if (strv_contains(bpffs_paths, test_suite[i].bpffs_path))
continue;
r = strv_extend(&bpffs_paths, test_suite[i].bpffs_path);
if (r < 0)
return log_error_errno(r, "Failed to put path into a vector: %m");
r = bpf_program_pin(prog->kernel_fd, test_suite[i].bpffs_path);
if (r < 0)
return log_error_errno(r, "Failed to pin BPF program '%s'", str);
}
*paths_ret = TAKE_PTR(bpffs_paths);
return 0;
}
static int test_bpf_cgroup_programs(Manager *m, const char *unit_name, const Test *test_suite, size_t test_suite_size) {
_cleanup_(unlink_paths_and_freep) char **bpffs_paths = NULL;
_cleanup_(unit_freep) Unit *u = NULL;
CGroupContext *cc = NULL;
int cld_code, r;
assert_se(u = unit_new(m, sizeof(Service)));
assert_se(unit_add_name(u, unit_name) == 0);
assert_se(cc = unit_get_cgroup_context(u));
r = pin_programs(u, cc, test_suite, test_suite_size, &bpffs_paths);
if (r < 0)
return log_error_errno(r, "Failed to pin programs: %m");
for (size_t i = 0; i < test_suite_size; i++) {
if (streq(test_suite[i].option_name, "BPFProgram")) {
_cleanup_free_ char *option = NULL;
r = bpf_foreign_test_to_string(test_suite[i].attach_type, test_suite[i].bpffs_path, &option);
if (r < 0)
return log_error_errno(r, "Failed to compose option string: %m");
r = config_parse_bpf_foreign_program(
u->id, "filename", 1, "Service", 1, test_suite[i].option_name, 0, option, cc, u);
if (r < 0)
return log_error_errno(r, "Failed to parse option string '%s': %m", option);
} else if (STR_IN_SET(test_suite[i].option_name, "IPIngressFilterPath", "IPEgressFilterPath")) {
const char *option = test_suite[i].bpffs_path;
void *paths = NULL;
if (streq(test_suite[i].option_name, "IPIngressFilterPath"))
paths = &cc->ip_filters_ingress;
else
paths = &cc->ip_filters_egress;
r = config_parse_ip_filter_bpf_progs(
u->id, "filename", 1, "Service", 1, test_suite[i].option_name, 0, option, paths, u);
if (r < 0)
return log_error_errno(r, "Failed to parse option string '%s': %m", option);
}
}
r = config_parse_exec(
u->id,
"filename",
1,
"Service",
1,
"ExecStart",
SERVICE_EXEC_START,
"-/bin/ping -c 5 127.0.0.1 -W 1",
SERVICE(u)->exec_command,
u);
if (r < 0)
return log_error_errno(r, "Failed to parse ExecStart");
SERVICE(u)->type = SERVICE_ONESHOT;
u->load_state = UNIT_LOADED;
r = unit_start(u);
if (r < 0)
return log_error_errno(r, "Unit start failed %m");
while (!IN_SET(SERVICE(u)->state, SERVICE_DEAD, SERVICE_FAILED)) {
r = sd_event_run(m->event, UINT64_MAX);
if (r < 0)
return log_error_errno(errno, "Event run failed %m");
}
cld_code = SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.code;
if (cld_code != CLD_EXITED)
return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
"Child didn't exit normally, code='%s'", sigchld_code_to_string(cld_code));
if (SERVICE(u)->state != SERVICE_DEAD)
return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Service is not dead");
return r;
}
int main(int argc, char *argv[]) {
_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
_cleanup_free_ char *unit_dir = NULL;
struct rlimit rl;
int r;
test_setup_logging(LOG_DEBUG);
if (detect_container() > 0)
return log_tests_skipped("test-bpf fails inside LXC and Docker containers: https://github.com/systemd/systemd/issues/9666");
if (getuid() != 0)
return log_tests_skipped("not running as root");
assert_se(getrlimit(RLIMIT_MEMLOCK, &rl) >= 0);
rl.rlim_cur = rl.rlim_max = MAX(rl.rlim_max, CAN_MEMLOCK_SIZE);
(void) setrlimit_closest(RLIMIT_MEMLOCK, &rl);
if (!can_memlock())
return log_tests_skipped("Can't use mlock()");
r = cg_all_unified();
if (r <= 0)
return log_tests_skipped("Unified hierarchy is required");
r = enter_cgroup_subroot(NULL);
if (r == -ENOMEDIUM)
return log_tests_skipped("cgroupfs not available");
assert_se(get_testdata_dir("units", &unit_dir) >= 0);
assert_se(set_unit_path(unit_dir) >= 0);
assert_se(runtime_dir = setup_fake_runtime_dir());
assert_se(manager_new(UNIT_FILE_USER, MANAGER_TEST_RUN_BASIC, &m) >= 0);
assert_se(manager_startup(m, NULL, NULL, NULL) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"single_prog.service", single_prog, ELEMENTSOF(single_prog)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"multi_prog_same_hook.service",
multi_prog_same_hook, ELEMENTSOF(multi_prog_same_hook)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"same_prog_multi_hook.service",
same_prog_multi_hook, ELEMENTSOF(same_prog_multi_hook)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"same_prog_multi_option_0.service",
same_prog_multi_option_0, ELEMENTSOF(same_prog_multi_option_0)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"same_prog_multi_option_1.service",
same_prog_multi_option_1, ELEMENTSOF(same_prog_multi_option_1)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"same_prog_same_hook.service",
same_prog_same_hook,
ELEMENTSOF(same_prog_same_hook)) >= 0);
assert_se(test_bpf_cgroup_programs(m,
"path_split_test.service",
path_split_test,
ELEMENTSOF(path_split_test)) >= 0);
return 0;
}
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