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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.*/
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <test_progs.h>
#include "cgrp_ls_tp_btf.skel.h"
#include "cgrp_ls_recursion.skel.h"
#include "cgrp_ls_attach_cgroup.skel.h"
#include "cgrp_ls_negative.skel.h"
#include "cgrp_ls_sleepable.skel.h"
#include "network_helpers.h"
#include "cgroup_helpers.h"
struct socket_cookie {
__u64 cookie_key;
__u32 cookie_value;
};
static void test_tp_btf(int cgroup_fd)
{
struct cgrp_ls_tp_btf *skel;
long val1 = 1, val2 = 0;
int err;
skel = cgrp_ls_tp_btf__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
return;
/* populate a value in map_b */
err = bpf_map_update_elem(bpf_map__fd(skel->maps.map_b), &cgroup_fd, &val1, BPF_ANY);
if (!ASSERT_OK(err, "map_update_elem"))
goto out;
/* check value */
err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.map_b), &cgroup_fd, &val2);
if (!ASSERT_OK(err, "map_lookup_elem"))
goto out;
if (!ASSERT_EQ(val2, 1, "map_lookup_elem, invalid val"))
goto out;
/* delete value */
err = bpf_map_delete_elem(bpf_map__fd(skel->maps.map_b), &cgroup_fd);
if (!ASSERT_OK(err, "map_delete_elem"))
goto out;
skel->bss->target_pid = syscall(SYS_gettid);
err = cgrp_ls_tp_btf__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
syscall(SYS_gettid);
syscall(SYS_gettid);
skel->bss->target_pid = 0;
/* 3x syscalls: 1x attach and 2x gettid */
ASSERT_EQ(skel->bss->enter_cnt, 3, "enter_cnt");
ASSERT_EQ(skel->bss->exit_cnt, 3, "exit_cnt");
ASSERT_EQ(skel->bss->mismatch_cnt, 0, "mismatch_cnt");
out:
cgrp_ls_tp_btf__destroy(skel);
}
static void test_attach_cgroup(int cgroup_fd)
{
int server_fd = 0, client_fd = 0, err = 0;
socklen_t addr_len = sizeof(struct sockaddr_in6);
struct cgrp_ls_attach_cgroup *skel;
__u32 cookie_expected_value;
struct sockaddr_in6 addr;
struct socket_cookie val;
skel = cgrp_ls_attach_cgroup__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->links.set_cookie = bpf_program__attach_cgroup(
skel->progs.set_cookie, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.set_cookie, "prog_attach"))
goto out;
skel->links.update_cookie_sockops = bpf_program__attach_cgroup(
skel->progs.update_cookie_sockops, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.update_cookie_sockops, "prog_attach"))
goto out;
skel->links.update_cookie_tracing = bpf_program__attach(
skel->progs.update_cookie_tracing);
if (!ASSERT_OK_PTR(skel->links.update_cookie_tracing, "prog_attach"))
goto out;
server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
if (!ASSERT_GE(server_fd, 0, "start_server"))
goto out;
client_fd = connect_to_fd(server_fd, 0);
if (!ASSERT_GE(client_fd, 0, "connect_to_fd"))
goto close_server_fd;
err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.socket_cookies),
&cgroup_fd, &val);
if (!ASSERT_OK(err, "map_lookup(socket_cookies)"))
goto close_client_fd;
err = getsockname(client_fd, (struct sockaddr *)&addr, &addr_len);
if (!ASSERT_OK(err, "getsockname"))
goto close_client_fd;
cookie_expected_value = (ntohs(addr.sin6_port) << 8) | 0xFF;
ASSERT_EQ(val.cookie_value, cookie_expected_value, "cookie_value");
close_client_fd:
close(client_fd);
close_server_fd:
close(server_fd);
out:
cgrp_ls_attach_cgroup__destroy(skel);
}
static void test_recursion(int cgroup_fd)
{
struct cgrp_ls_recursion *skel;
int err;
skel = cgrp_ls_recursion__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
return;
err = cgrp_ls_recursion__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
/* trigger sys_enter, make sure it does not cause deadlock */
syscall(SYS_gettid);
out:
cgrp_ls_recursion__destroy(skel);
}
static void test_negative(void)
{
struct cgrp_ls_negative *skel;
skel = cgrp_ls_negative__open_and_load();
if (!ASSERT_ERR_PTR(skel, "skel_open_and_load")) {
cgrp_ls_negative__destroy(skel);
return;
}
}
static void test_cgroup_iter_sleepable(int cgroup_fd, __u64 cgroup_id)
{
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
union bpf_iter_link_info linfo;
struct cgrp_ls_sleepable *skel;
struct bpf_link *link;
int err, iter_fd;
char buf[16];
skel = cgrp_ls_sleepable__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
bpf_program__set_autoload(skel->progs.cgroup_iter, true);
err = cgrp_ls_sleepable__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto out;
memset(&linfo, 0, sizeof(linfo));
linfo.cgroup.cgroup_fd = cgroup_fd;
linfo.cgroup.order = BPF_CGROUP_ITER_SELF_ONLY;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.cgroup_iter, &opts);
if (!ASSERT_OK_PTR(link, "attach_iter"))
goto out;
iter_fd = bpf_iter_create(bpf_link__fd(link));
if (!ASSERT_GE(iter_fd, 0, "iter_create"))
goto out;
/* trigger the program run */
(void)read(iter_fd, buf, sizeof(buf));
ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
close(iter_fd);
out:
cgrp_ls_sleepable__destroy(skel);
}
static void test_no_rcu_lock(__u64 cgroup_id)
{
struct cgrp_ls_sleepable *skel;
int err;
skel = cgrp_ls_sleepable__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->bss->target_pid = syscall(SYS_gettid);
bpf_program__set_autoload(skel->progs.no_rcu_lock, true);
err = cgrp_ls_sleepable__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto out;
err = cgrp_ls_sleepable__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
syscall(SYS_getpgid);
ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
out:
cgrp_ls_sleepable__destroy(skel);
}
static void test_rcu_lock(void)
{
struct cgrp_ls_sleepable *skel;
int err;
skel = cgrp_ls_sleepable__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
bpf_program__set_autoload(skel->progs.yes_rcu_lock, true);
err = cgrp_ls_sleepable__load(skel);
ASSERT_ERR(err, "skel_load");
cgrp_ls_sleepable__destroy(skel);
}
void test_cgrp_local_storage(void)
{
__u64 cgroup_id;
int cgroup_fd;
cgroup_fd = test__join_cgroup("/cgrp_local_storage");
if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /cgrp_local_storage"))
return;
cgroup_id = get_cgroup_id("/cgrp_local_storage");
if (test__start_subtest("tp_btf"))
test_tp_btf(cgroup_fd);
if (test__start_subtest("attach_cgroup"))
test_attach_cgroup(cgroup_fd);
if (test__start_subtest("recursion"))
test_recursion(cgroup_fd);
if (test__start_subtest("negative"))
test_negative();
if (test__start_subtest("cgroup_iter_sleepable"))
test_cgroup_iter_sleepable(cgroup_fd, cgroup_id);
if (test__start_subtest("no_rcu_lock"))
test_no_rcu_lock(cgroup_id);
if (test__start_subtest("rcu_lock"))
test_rcu_lock();
close(cgroup_fd);
}
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