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mptcp: introduce token KUNIT self-tests 

Unit tests for the internal MPTCP token APIs, using KUNIT

v1 -> v2:
 - use the correct RCU annotation when initializing icsk ulp
 - fix a few checkpatch issues

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-06-26 19:30:02 +02:00 committed by David S. Miller
parent a00a582203
commit a8ee9c9b58
4 changed files with 152 additions and 2 deletions
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2
net/mptcp/Kconfig
View File

@ -26,7 +26,7 @@ config MPTCP_KUNIT_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Currently covers the MPTCP crypto helpers.
Currently covers the MPTCP crypto and token helpers.
Only useful for kernel devs running KUnit test harness and are not
for inclusion into a production build.

3
net/mptcp/Makefile
View File

@ -5,4 +5,5 @@ mptcp-y := protocol.o subflow.o options.o token.o crypto.o ctrl.o pm.o diag.o \
mib.o pm_netlink.o
mptcp_crypto_test-objs := crypto_test.o
obj-$(CONFIG_MPTCP_KUNIT_TESTS) += mptcp_crypto_test.o
mptcp_token_test-objs := token_test.o
obj-$(CONFIG_MPTCP_KUNIT_TESTS) += mptcp_crypto_test.o mptcp_token_test.o

9
net/mptcp/token.c
View File

@ -307,3 +307,12 @@ void __init mptcp_token_init(void)
spin_lock_init(&token_hash[i].lock);
}
}
#if IS_MODULE(CONFIG_MPTCP_KUNIT_TESTS)
EXPORT_SYMBOL_GPL(mptcp_token_new_request);
EXPORT_SYMBOL_GPL(mptcp_token_new_connect);
EXPORT_SYMBOL_GPL(mptcp_token_accept);
EXPORT_SYMBOL_GPL(mptcp_token_get_sock);
EXPORT_SYMBOL_GPL(mptcp_token_destroy_request);
EXPORT_SYMBOL_GPL(mptcp_token_destroy);
#endif

140
net/mptcp/token_test.c Normal file
View File

@ -0,0 +1,140 @@
// SPDX-License-Identifier: GPL-2.0
#include <kunit/test.h>
#include "protocol.h"
static struct mptcp_subflow_request_sock *build_req_sock(struct kunit *test)
{
struct mptcp_subflow_request_sock *req;
req = kunit_kzalloc(test, sizeof(struct mptcp_subflow_request_sock),
GFP_USER);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, req);
mptcp_token_init_request((struct request_sock *)req);
return req;
}
static void mptcp_token_test_req_basic(struct kunit *test)
{
struct mptcp_subflow_request_sock *req = build_req_sock(test);
struct mptcp_sock *null_msk = NULL;
KUNIT_ASSERT_EQ(test, 0,
mptcp_token_new_request((struct request_sock *)req));
KUNIT_EXPECT_NE(test, 0, (int)req->token);
KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(req->token));
/* cleanup */
mptcp_token_destroy_request((struct request_sock *)req);
}
static struct inet_connection_sock *build_icsk(struct kunit *test)
{
struct inet_connection_sock *icsk;
icsk = kunit_kzalloc(test, sizeof(struct inet_connection_sock),
GFP_USER);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, icsk);
return icsk;
}
static struct mptcp_subflow_context *build_ctx(struct kunit *test)
{
struct mptcp_subflow_context *ctx;
ctx = kunit_kzalloc(test, sizeof(struct mptcp_subflow_context),
GFP_USER);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, ctx);
return ctx;
}
static struct mptcp_sock *build_msk(struct kunit *test)
{
struct mptcp_sock *msk;
msk = kunit_kzalloc(test, sizeof(struct mptcp_sock), GFP_USER);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, msk);
refcount_set(&((struct sock *)msk)->sk_refcnt, 1);
return msk;
}
static void mptcp_token_test_msk_basic(struct kunit *test)
{
struct inet_connection_sock *icsk = build_icsk(test);
struct mptcp_subflow_context *ctx = build_ctx(test);
struct mptcp_sock *msk = build_msk(test);
struct mptcp_sock *null_msk = NULL;
struct sock *sk;
rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
ctx->conn = (struct sock *)msk;
sk = (struct sock *)msk;
KUNIT_ASSERT_EQ(test, 0,
mptcp_token_new_connect((struct sock *)icsk));
KUNIT_EXPECT_NE(test, 0, (int)ctx->token);
KUNIT_EXPECT_EQ(test, ctx->token, msk->token);
KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(ctx->token));
KUNIT_EXPECT_EQ(test, 2, (int)refcount_read(&sk->sk_refcnt));
mptcp_token_destroy(msk);
KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(ctx->token));
}
static void mptcp_token_test_accept(struct kunit *test)
{
struct mptcp_subflow_request_sock *req = build_req_sock(test);
struct mptcp_sock *msk = build_msk(test);
KUNIT_ASSERT_EQ(test, 0,
mptcp_token_new_request((struct request_sock *)req));
msk->token = req->token;
mptcp_token_accept(req, msk);
KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(msk->token));
/* this is now a no-op */
mptcp_token_destroy_request((struct request_sock *)req);
KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(msk->token));
/* cleanup */
mptcp_token_destroy(msk);
}
static void mptcp_token_test_destroyed(struct kunit *test)
{
struct mptcp_subflow_request_sock *req = build_req_sock(test);
struct mptcp_sock *msk = build_msk(test);
struct mptcp_sock *null_msk = NULL;
struct sock *sk;
sk = (struct sock *)msk;
KUNIT_ASSERT_EQ(test, 0,
mptcp_token_new_request((struct request_sock *)req));
msk->token = req->token;
mptcp_token_accept(req, msk);
/* simulate race on removal */
refcount_set(&sk->sk_refcnt, 0);
KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(msk->token));
/* cleanup */
mptcp_token_destroy(msk);
}
static struct kunit_case mptcp_token_test_cases[] = {
KUNIT_CASE(mptcp_token_test_req_basic),
KUNIT_CASE(mptcp_token_test_msk_basic),
KUNIT_CASE(mptcp_token_test_accept),
KUNIT_CASE(mptcp_token_test_destroyed),
{}
};
static struct kunit_suite mptcp_token_suite = {
.name = "mptcp-token",
.test_cases = mptcp_token_test_cases,
};
kunit_test_suite(mptcp_token_suite);
MODULE_LICENSE("GPL");