// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "cgroup_helpers.h"
#include "sockopt_multi.skel.h"
static int run_getsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
struct bpf_link *link_parent = NULL;
struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
/* Set IP_TOS to the expected value (0x80). */
buf = 0x80;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0x80) {
log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf);
err = -1;
goto detach;
}
/* Attach child program and make sure it returns new value:
* - kernel: -> 0x80
* - child: 0x80 -> 0x90
*/
link_child = bpf_program__attach_cgroup(obj->progs._getsockopt_child,
cg_child);
if (!ASSERT_OK_PTR(link_child, "cg-attach-getsockopt_child"))
goto detach;
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0x90) {
log_err("Unexpected getsockopt 0x%x != 0x90", buf);
err = -1;
goto detach;
}
/* Attach parent program and make sure it returns new value:
* - kernel: -> 0x80
* - child: 0x80 -> 0x90
* - parent: 0x90 -> 0xA0
*/
link_parent = bpf_program__attach_cgroup(obj->progs._getsockopt_parent,
cg_parent);
if (!ASSERT_OK_PTR(link_parent, "cg-attach-getsockopt_parent"))
goto detach;
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0xA0) {
log_err("Unexpected getsockopt 0x%x != 0xA0", buf);
err = -1;
goto detach;
}
/* Setting unexpected initial sockopt should return EPERM:
* - kernel: -> 0x40
* - child: unexpected 0x40, EPERM
* - parent: unexpected 0x40, EPERM
*/
buf = 0x40;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (!err) {
log_err("Unexpected success from getsockopt(IP_TOS)");
goto detach;
}
/* Detach child program and make sure we still get EPERM:
* - kernel: -> 0x40
* - parent: unexpected 0x40, EPERM
*/
bpf_link__destroy(link_child);
link_child = NULL;
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (!err) {
log_err("Unexpected success from getsockopt(IP_TOS)");
goto detach;
}
/* Set initial value to the one the parent program expects:
* - kernel: -> 0x90
* - parent: 0x90 -> 0xA0
*/
buf = 0x90;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0xA0) {
log_err("Unexpected getsockopt 0x%x != 0xA0", buf);
err = -1;
goto detach;
}
detach:
bpf_link__destroy(link_child);
bpf_link__destroy(link_parent);
return err;
}
static int run_setsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
struct bpf_link *link_parent = NULL;
struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
/* Set IP_TOS to the expected value (0x80). */
buf = 0x80;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0x80) {
log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf);
err = -1;
goto detach;
}
/* Attach child program and make sure it adds 0x10. */
link_child = bpf_program__attach_cgroup(obj->progs._setsockopt,
cg_child);
if (!ASSERT_OK_PTR(link_child, "cg-attach-setsockopt_child"))
goto detach;
buf = 0x80;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0x80 + 0x10) {
log_err("Unexpected getsockopt 0x%x != 0x80 + 0x10", buf);
err = -1;
goto detach;
}
/* Attach parent program and make sure it adds another 0x10. */
link_parent = bpf_program__attach_cgroup(obj->progs._setsockopt,
cg_parent);
if (!ASSERT_OK_PTR(link_parent, "cg-attach-setsockopt_parent"))
goto detach;
buf = 0x80;
err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);
if (err < 0) {
log_err("Failed to call setsockopt(IP_TOS)");
goto detach;
}
buf = 0x00;
optlen = 1;
err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
if (err) {
log_err("Failed to call getsockopt(IP_TOS)");
goto detach;
}
if (buf != 0x80 + 2 * 0x10) {
log_err("Unexpected getsockopt 0x%x != 0x80 + 2 * 0x10", buf);
err = -1;
goto detach;
}
detach:
bpf_link__destroy(link_child);
bpf_link__destroy(link_parent);
return err;
}
void test_sockopt_multi(void)
{
int cg_parent = -1, cg_child = -1;
struct sockopt_multi *obj = NULL;
int sock_fd = -1;
cg_parent = test__join_cgroup("/parent");
if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent"))
goto out;
cg_child = test__join_cgroup("/parent/child");
if (!ASSERT_GE(cg_child, 0, "join_cgroup /parent/child"))
goto out;
obj = sockopt_multi__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
goto out;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if (!ASSERT_GE(sock_fd, 0, "socket"))
goto out;
ASSERT_OK(run_getsockopt_test(obj, cg_parent, cg_child, sock_fd), "getsockopt_test");
ASSERT_OK(run_setsockopt_test(obj, cg_parent, cg_child, sock_fd), "setsockopt_test");
out:
close(sock_fd);
sockopt_multi__destroy(obj);
close(cg_child);
close(cg_parent);
}
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