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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "cgroup_helpers.h"
#define SOL_CUSTOM 0xdeadbeef
#define CUSTOM_INHERIT1 0
#define CUSTOM_INHERIT2 1
#define CUSTOM_LISTENER 2
static int connect_to_server(int server_fd)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
int fd;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
log_err("Failed to get server addr");
goto out;
}
if (connect(fd, (const struct sockaddr *)&addr, len) < 0) {
log_err("Fail to connect to server");
goto out;
}
return fd;
out:
close(fd);
return -1;
}
static int verify_sockopt(int fd, int optname, const char *msg, char expected)
{
socklen_t optlen = 1;
char buf = 0;
int err;
err = getsockopt(fd, SOL_CUSTOM, optname, &buf, &optlen);
if (err) {
log_err("%s: failed to call getsockopt", msg);
return 1;
}
printf("%s %d: got=0x%x ? expected=0x%x\n", msg, optname, buf, expected);
if (buf != expected) {
log_err("%s: unexpected getsockopt value %d != %d", msg,
buf, expected);
return 1;
}
return 0;
}
static pthread_mutex_t server_started_mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t server_started = PTHREAD_COND_INITIALIZER;
static void *server_thread(void *arg)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
int fd = *(int *)arg;
int client_fd;
int err = 0;
err = listen(fd, 1);
pthread_mutex_lock(&server_started_mtx);
pthread_cond_signal(&server_started);
pthread_mutex_unlock(&server_started_mtx);
if (CHECK_FAIL(err < 0)) {
perror("Failed to listed on socket");
return NULL;
}
err += verify_sockopt(fd, CUSTOM_INHERIT1, "listen", 1);
err += verify_sockopt(fd, CUSTOM_INHERIT2, "listen", 1);
err += verify_sockopt(fd, CUSTOM_LISTENER, "listen", 1);
client_fd = accept(fd, (struct sockaddr *)&addr, &len);
if (CHECK_FAIL(client_fd < 0)) {
perror("Failed to accept client");
return NULL;
}
err += verify_sockopt(client_fd, CUSTOM_INHERIT1, "accept", 1);
err += verify_sockopt(client_fd, CUSTOM_INHERIT2, "accept", 1);
err += verify_sockopt(client_fd, CUSTOM_LISTENER, "accept", 0);
close(client_fd);
return (void *)(long)err;
}
static int start_server(void)
{
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
char buf;
int err;
int fd;
int i;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
log_err("Failed to create server socket");
return -1;
}
for (i = CUSTOM_INHERIT1; i <= CUSTOM_LISTENER; i++) {
buf = 0x01;
err = setsockopt(fd, SOL_CUSTOM, i, &buf, 1);
if (err) {
log_err("Failed to call setsockopt(%d)", i);
close(fd);
return -1;
}
}
if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
log_err("Failed to bind socket");
close(fd);
return -1;
}
return fd;
}
static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title)
{
enum bpf_attach_type attach_type;
enum bpf_prog_type prog_type;
struct bpf_program *prog;
int err;
err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
if (err) {
log_err("Failed to deduct types for %s BPF program", title);
return -1;
}
prog = bpf_object__find_program_by_title(obj, title);
if (!prog) {
log_err("Failed to find %s BPF program", title);
return -1;
}
err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
attach_type, 0);
if (err) {
log_err("Failed to attach %s BPF program", title);
return -1;
}
return 0;
}
static void run_test(int cgroup_fd)
{
struct bpf_prog_load_attr attr = {
.file = "./sockopt_inherit.o",
};
int server_fd = -1, client_fd;
struct bpf_object *obj;
void *server_err;
pthread_t tid;
int ignored;
int err;
err = bpf_prog_load_xattr(&attr, &obj, &ignored);
if (CHECK_FAIL(err))
return;
err = prog_attach(obj, cgroup_fd, "cgroup/getsockopt");
if (CHECK_FAIL(err))
goto close_bpf_object;
err = prog_attach(obj, cgroup_fd, "cgroup/setsockopt");
if (CHECK_FAIL(err))
goto close_bpf_object;
server_fd = start_server();
if (CHECK_FAIL(server_fd < 0))
goto close_bpf_object;
pthread_mutex_lock(&server_started_mtx);
if (CHECK_FAIL(pthread_create(&tid, NULL, server_thread,
(void *)&server_fd)))
goto close_server_fd;
pthread_cond_wait(&server_started, &server_started_mtx);
pthread_mutex_unlock(&server_started_mtx);
client_fd = connect_to_server(server_fd);
if (CHECK_FAIL(client_fd < 0))
goto close_server_fd;
CHECK_FAIL(verify_sockopt(client_fd, CUSTOM_INHERIT1, "connect", 0));
CHECK_FAIL(verify_sockopt(client_fd, CUSTOM_INHERIT2, "connect", 0));
CHECK_FAIL(verify_sockopt(client_fd, CUSTOM_LISTENER, "connect", 0));
pthread_join(tid, &server_err);
err = (int)(long)server_err;
CHECK_FAIL(err);
close(client_fd);
close_server_fd:
close(server_fd);
close_bpf_object:
bpf_object__close(obj);
}
void test_sockopt_inherit(void)
{
int cgroup_fd;
cgroup_fd = test__join_cgroup("/sockopt_inherit");
if (CHECK_FAIL(cgroup_fd < 0))
return;
run_test(cgroup_fd);
close(cgroup_fd);
}
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