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|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2021 Google LLC.
*/
#include <test_progs.h>
#include <cgroup_helpers.h>
#include <network_helpers.h>
#include "cgroup_getset_retval_setsockopt.skel.h"
#include "cgroup_getset_retval_getsockopt.skel.h"
#include "cgroup_getset_retval_hooks.skel.h"
#define SOL_CUSTOM 0xdeadbeef
static int zero;
static void test_setsockopt_set(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_set_eunatch = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that sets EUNATCH, assert that
* we actually get that error when we run setsockopt()
*/
link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eunatch);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_set_and_get(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_set_eunatch = NULL, *link_get_retval = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that sets EUNATCH, and one that gets the
* previously set errno. Assert that we get the same errno back.
*/
link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
goto close_bpf_object;
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, -EUNATCH, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eunatch);
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_default_zero(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_get_retval = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that gets the previously set errno.
* Assert that, without anything setting one, we get 0.
*/
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_OK(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_default_zero_and_set(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_get_retval = NULL, *link_set_eunatch = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that gets the previously set errno, and then
* one that sets the errno to EUNATCH. Assert that the get does not
* see EUNATCH set later, and does not prevent EUNATCH from being set.
*/
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_get_retval);
bpf_link__destroy(link_set_eunatch);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_override(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_set_eunatch = NULL, *link_set_eisconn = NULL;
struct bpf_link *link_get_retval = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that sets EUNATCH, then one that sets EISCONN,
* and then one that gets the exported errno. Assert both the syscall
* and the helper sees the last set errno.
*/
link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
goto close_bpf_object;
link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
goto close_bpf_object;
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EISCONN, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, -EISCONN, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eunatch);
bpf_link__destroy(link_set_eisconn);
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_legacy_eperm(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_legacy_eperm = NULL, *link_get_retval = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that return a reject without setting errno
* (legacy reject), and one that gets the errno. Assert that for
* backward compatibility the syscall result in EPERM, and this
* is also visible to the helper.
*/
link_legacy_eperm = bpf_program__attach_cgroup(obj->progs.legacy_eperm,
cgroup_fd);
if (!ASSERT_OK_PTR(link_legacy_eperm, "cg-attach-legacy_eperm"))
goto close_bpf_object;
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EPERM, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 2, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, -EPERM, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_legacy_eperm);
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_setsockopt_legacy_no_override(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_setsockopt *obj;
struct bpf_link *link_set_eunatch = NULL, *link_legacy_eperm = NULL;
struct bpf_link *link_get_retval = NULL;
obj = cgroup_getset_retval_setsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach setsockopt that sets EUNATCH, then one that return a reject
* without setting errno, and then one that gets the exported errno.
* Assert both the syscall and the helper's errno are unaffected by
* the second prog (i.e. legacy rejects does not override the errno
* to EPERM).
*/
link_set_eunatch = bpf_program__attach_cgroup(obj->progs.set_eunatch,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eunatch, "cg-attach-set_eunatch"))
goto close_bpf_object;
link_legacy_eperm = bpf_program__attach_cgroup(obj->progs.legacy_eperm,
cgroup_fd);
if (!ASSERT_OK_PTR(link_legacy_eperm, "cg-attach-legacy_eperm"))
goto close_bpf_object;
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_ERR(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
&zero, sizeof(int)), "setsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EUNATCH, "setsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, -EUNATCH, "retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eunatch);
bpf_link__destroy(link_legacy_eperm);
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_setsockopt__destroy(obj);
}
static void test_getsockopt_get(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_getsockopt *obj;
struct bpf_link *link_get_retval = NULL;
int buf;
socklen_t optlen = sizeof(buf);
obj = cgroup_getset_retval_getsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach getsockopt that gets previously set errno. Assert that the
* error from kernel is in both ctx_retval_value and retval_value.
*/
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_ERR(getsockopt(sock_fd, SOL_CUSTOM, 0,
&buf, &optlen), "getsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EOPNOTSUPP, "getsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, -EOPNOTSUPP, "retval_value"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->ctx_retval_value, -EOPNOTSUPP, "ctx_retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_getsockopt__destroy(obj);
}
static void test_getsockopt_override(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_getsockopt *obj;
struct bpf_link *link_set_eisconn = NULL;
int buf;
socklen_t optlen = sizeof(buf);
obj = cgroup_getset_retval_getsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach getsockopt that sets retval to -EISCONN. Assert that this
* overrides the value from kernel.
*/
link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
goto close_bpf_object;
if (!ASSERT_ERR(getsockopt(sock_fd, SOL_CUSTOM, 0,
&buf, &optlen), "getsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(errno, EISCONN, "getsockopt-errno"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 1, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eisconn);
cgroup_getset_retval_getsockopt__destroy(obj);
}
static void test_getsockopt_retval_sync(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_getsockopt *obj;
struct bpf_link *link_set_eisconn = NULL, *link_clear_retval = NULL;
struct bpf_link *link_get_retval = NULL;
int buf;
socklen_t optlen = sizeof(buf);
obj = cgroup_getset_retval_getsockopt__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
/* Attach getsockopt that sets retval to -EISCONN, and one that clears
* ctx retval. Assert that the clearing ctx retval is synced to helper
* and clears any errors both from kernel and BPF..
*/
link_set_eisconn = bpf_program__attach_cgroup(obj->progs.set_eisconn,
cgroup_fd);
if (!ASSERT_OK_PTR(link_set_eisconn, "cg-attach-set_eisconn"))
goto close_bpf_object;
link_clear_retval = bpf_program__attach_cgroup(obj->progs.clear_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_clear_retval, "cg-attach-clear_retval"))
goto close_bpf_object;
link_get_retval = bpf_program__attach_cgroup(obj->progs.get_retval,
cgroup_fd);
if (!ASSERT_OK_PTR(link_get_retval, "cg-attach-get_retval"))
goto close_bpf_object;
if (!ASSERT_OK(getsockopt(sock_fd, SOL_CUSTOM, 0,
&buf, &optlen), "getsockopt"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->invocations, 3, "invocations"))
goto close_bpf_object;
if (!ASSERT_FALSE(obj->bss->assertion_error, "assertion_error"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->retval_value, 0, "retval_value"))
goto close_bpf_object;
if (!ASSERT_EQ(obj->bss->ctx_retval_value, 0, "ctx_retval_value"))
goto close_bpf_object;
close_bpf_object:
bpf_link__destroy(link_set_eisconn);
bpf_link__destroy(link_clear_retval);
bpf_link__destroy(link_get_retval);
cgroup_getset_retval_getsockopt__destroy(obj);
}
struct exposed_hook {
const char *name;
int expected_err;
} exposed_hooks[] = {
#define BPF_RETVAL_HOOK(NAME, SECTION, CTX, EXPECTED_ERR) \
{ \
.name = #NAME, \
.expected_err = EXPECTED_ERR, \
},
#include "cgroup_getset_retval_hooks.h"
#undef BPF_RETVAL_HOOK
};
static void test_exposed_hooks(int cgroup_fd, int sock_fd)
{
struct cgroup_getset_retval_hooks *skel;
struct bpf_program *prog;
int err;
int i;
for (i = 0; i < ARRAY_SIZE(exposed_hooks); i++) {
skel = cgroup_getset_retval_hooks__open();
if (!ASSERT_OK_PTR(skel, "cgroup_getset_retval_hooks__open"))
continue;
prog = bpf_object__find_program_by_name(skel->obj, exposed_hooks[i].name);
if (!ASSERT_NEQ(prog, NULL, "bpf_object__find_program_by_name"))
goto close_skel;
err = bpf_program__set_autoload(prog, true);
if (!ASSERT_OK(err, "bpf_program__set_autoload"))
goto close_skel;
err = cgroup_getset_retval_hooks__load(skel);
ASSERT_EQ(err, exposed_hooks[i].expected_err, "expected_err");
close_skel:
cgroup_getset_retval_hooks__destroy(skel);
}
}
void test_cgroup_getset_retval(void)
{
int cgroup_fd = -1;
int sock_fd = -1;
cgroup_fd = test__join_cgroup("/cgroup_getset_retval");
if (!ASSERT_GE(cgroup_fd, 0, "cg-create"))
goto close_fd;
sock_fd = start_server(AF_INET, SOCK_DGRAM, NULL, 0, 0);
if (!ASSERT_GE(sock_fd, 0, "start-server"))
goto close_fd;
if (test__start_subtest("setsockopt-set"))
test_setsockopt_set(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-set_and_get"))
test_setsockopt_set_and_get(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-default_zero"))
test_setsockopt_default_zero(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-default_zero_and_set"))
test_setsockopt_default_zero_and_set(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-override"))
test_setsockopt_override(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-legacy_eperm"))
test_setsockopt_legacy_eperm(cgroup_fd, sock_fd);
if (test__start_subtest("setsockopt-legacy_no_override"))
test_setsockopt_legacy_no_override(cgroup_fd, sock_fd);
if (test__start_subtest("getsockopt-get"))
test_getsockopt_get(cgroup_fd, sock_fd);
if (test__start_subtest("getsockopt-override"))
test_getsockopt_override(cgroup_fd, sock_fd);
if (test__start_subtest("getsockopt-retval_sync"))
test_getsockopt_retval_sync(cgroup_fd, sock_fd);
if (test__start_subtest("exposed_hooks"))
test_exposed_hooks(cgroup_fd, sock_fd);
close_fd:
close(cgroup_fd);
}
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