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// SPDX-License-Identifier: GPL-2.0
/* Check what features does the kernel support (where the selftest is running).
* Somewhat inspired by CRIU kerndat/kdat kernel features detector.
*/
#include <pthread.h>
#include "aolib.h"
struct kconfig_t {
int _errno; /* the returned error if not supported */
int (*check_kconfig)(int *error);
};
static int has_net_ns(int *err)
{
if (access("/proc/self/ns/net", F_OK) < 0) {
*err = errno;
if (errno == ENOENT)
return 0;
test_print("Unable to access /proc/self/ns/net: %m");
return -errno;
}
return *err = errno = 0;
}
static int has_veth(int *err)
{
int orig_netns, ns_a, ns_b;
orig_netns = open_netns();
ns_a = unshare_open_netns();
ns_b = unshare_open_netns();
*err = add_veth("check_veth", ns_a, ns_b);
switch_ns(orig_netns);
close(orig_netns);
close(ns_a);
close(ns_b);
return 0;
}
static int has_tcp_ao(int *err)
{
struct sockaddr_in addr = {
.sin_family = test_family,
};
struct tcp_ao_add tmp = {};
const char *password = DEFAULT_TEST_PASSWORD;
int sk, ret = 0;
sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
if (sk < 0) {
test_print("socket(): %m");
return -errno;
}
tmp.sndid = 100;
tmp.rcvid = 100;
tmp.keylen = strlen(password);
memcpy(tmp.key, password, strlen(password));
strcpy(tmp.alg_name, "hmac(sha1)");
memcpy(&tmp.addr, &addr, sizeof(addr));
*err = 0;
if (setsockopt(sk, IPPROTO_TCP, TCP_AO_ADD_KEY, &tmp, sizeof(tmp)) < 0) {
*err = errno;
if (errno != ENOPROTOOPT)
ret = -errno;
}
close(sk);
return ret;
}
static int has_tcp_md5(int *err)
{
union tcp_addr addr_any = {};
int sk, ret = 0;
sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sk < 0) {
test_print("socket(): %m");
return -errno;
}
/*
* Under CONFIG_CRYPTO_FIPS=y it fails with ENOMEM, rather with
* anything more descriptive. Oh well.
*/
*err = 0;
if (test_set_md5(sk, addr_any, 0, -1, DEFAULT_TEST_PASSWORD)) {
*err = errno;
if (errno != ENOPROTOOPT && errno == ENOMEM) {
test_print("setsockopt(TCP_MD5SIG_EXT): %m");
ret = -errno;
}
}
close(sk);
return ret;
}
static int has_vrfs(int *err)
{
int orig_netns, ns_test, ret = 0;
orig_netns = open_netns();
ns_test = unshare_open_netns();
*err = add_vrf("ksft-check", 55, 101, ns_test);
if (*err && *err != -EOPNOTSUPP) {
test_print("Failed to add a VRF: %d", *err);
ret = *err;
}
switch_ns(orig_netns);
close(orig_netns);
close(ns_test);
return ret;
}
static pthread_mutex_t kconfig_lock = PTHREAD_MUTEX_INITIALIZER;
static struct kconfig_t kconfig[__KCONFIG_LAST__] = {
{ -1, has_net_ns },
{ -1, has_veth },
{ -1, has_tcp_ao },
{ -1, has_tcp_md5 },
{ -1, has_vrfs },
};
const char *tests_skip_reason[__KCONFIG_LAST__] = {
"Tests require network namespaces support (CONFIG_NET_NS)",
"Tests require veth support (CONFIG_VETH)",
"Tests require TCP-AO support (CONFIG_TCP_AO)",
"setsockopt(TCP_MD5SIG_EXT) is not supported (CONFIG_TCP_MD5)",
"VRFs are not supported (CONFIG_NET_VRF)",
};
bool kernel_config_has(enum test_needs_kconfig k)
{
bool ret;
pthread_mutex_lock(&kconfig_lock);
if (kconfig[k]._errno == -1) {
if (kconfig[k].check_kconfig(&kconfig[k]._errno))
test_error("Failed to initialize kconfig %u", k);
}
ret = kconfig[k]._errno == 0;
pthread_mutex_unlock(&kconfig_lock);
return ret;
}
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