1// SPDX-License-Identifier: GPL-2.0
  2#include <kunit/test.h>
  3
  4#include "protocol.h"
  5
  6static struct mptcp_subflow_request_sock *build_req_sock(struct kunit *test)
  7{
  8	struct mptcp_subflow_request_sock *req;
  9
 10	req = kunit_kzalloc(test, sizeof(struct mptcp_subflow_request_sock),
 11			    GFP_USER);
 12	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, req);
 13	mptcp_token_init_request((struct request_sock *)req);
 14	return req;
 15}
 16
 17static void mptcp_token_test_req_basic(struct kunit *test)
 18{
 19	struct mptcp_subflow_request_sock *req = build_req_sock(test);
 20	struct mptcp_sock *null_msk = NULL;
 21
 22	KUNIT_ASSERT_EQ(test, 0,
 23			mptcp_token_new_request((struct request_sock *)req));
 24	KUNIT_EXPECT_NE(test, 0, (int)req->token);
 25	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(req->token));
 26
 27	/* cleanup */
 28	mptcp_token_destroy_request((struct request_sock *)req);
 29}
 30
 31static struct inet_connection_sock *build_icsk(struct kunit *test)
 32{
 33	struct inet_connection_sock *icsk;
 34
 35	icsk = kunit_kzalloc(test, sizeof(struct inet_connection_sock),
 36			     GFP_USER);
 37	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, icsk);
 38	return icsk;
 39}
 40
 41static struct mptcp_subflow_context *build_ctx(struct kunit *test)
 42{
 43	struct mptcp_subflow_context *ctx;
 44
 45	ctx = kunit_kzalloc(test, sizeof(struct mptcp_subflow_context),
 46			    GFP_USER);
 47	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, ctx);
 48	return ctx;
 49}
 50
 51static struct mptcp_sock *build_msk(struct kunit *test)
 52{
 53	struct mptcp_sock *msk;
 54
 55	msk = kunit_kzalloc(test, sizeof(struct mptcp_sock), GFP_USER);
 56	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, msk);
 57	refcount_set(&((struct sock *)msk)->sk_refcnt, 1);
 58	return msk;
 59}
 60
 61static void mptcp_token_test_msk_basic(struct kunit *test)
 62{
 63	struct inet_connection_sock *icsk = build_icsk(test);
 64	struct mptcp_subflow_context *ctx = build_ctx(test);
 65	struct mptcp_sock *msk = build_msk(test);
 66	struct mptcp_sock *null_msk = NULL;
 67	struct sock *sk;
 68
 69	rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 70	ctx->conn = (struct sock *)msk;
 71	sk = (struct sock *)msk;
 72
 73	KUNIT_ASSERT_EQ(test, 0,
 74			mptcp_token_new_connect((struct sock *)icsk));
 75	KUNIT_EXPECT_NE(test, 0, (int)ctx->token);
 76	KUNIT_EXPECT_EQ(test, ctx->token, msk->token);
 77	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(ctx->token));
 78	KUNIT_EXPECT_EQ(test, 2, (int)refcount_read(&sk->sk_refcnt));
 79
 80	mptcp_token_destroy(msk);
 81	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(ctx->token));
 82}
 83
 84static void mptcp_token_test_accept(struct kunit *test)
 85{
 86	struct mptcp_subflow_request_sock *req = build_req_sock(test);
 87	struct mptcp_sock *msk = build_msk(test);
 88
 89	KUNIT_ASSERT_EQ(test, 0,
 90			mptcp_token_new_request((struct request_sock *)req));
 91	msk->token = req->token;
 92	mptcp_token_accept(req, msk);
 93	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(msk->token));
 94
 95	/* this is now a no-op */
 96	mptcp_token_destroy_request((struct request_sock *)req);
 97	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(msk->token));
 98
 99	/* cleanup */
100	mptcp_token_destroy(msk);
101}
102
103static void mptcp_token_test_destroyed(struct kunit *test)
104{
105	struct mptcp_subflow_request_sock *req = build_req_sock(test);
106	struct mptcp_sock *msk = build_msk(test);
107	struct mptcp_sock *null_msk = NULL;
108	struct sock *sk;
109
110	sk = (struct sock *)msk;
111
112	KUNIT_ASSERT_EQ(test, 0,
113			mptcp_token_new_request((struct request_sock *)req));
114	msk->token = req->token;
115	mptcp_token_accept(req, msk);
116
117	/* simulate race on removal */
118	refcount_set(&sk->sk_refcnt, 0);
119	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(msk->token));
120
121	/* cleanup */
122	mptcp_token_destroy(msk);
123}
124
125static struct kunit_case mptcp_token_test_cases[] = {
126	KUNIT_CASE(mptcp_token_test_req_basic),
127	KUNIT_CASE(mptcp_token_test_msk_basic),
128	KUNIT_CASE(mptcp_token_test_accept),
129	KUNIT_CASE(mptcp_token_test_destroyed),
130	{}
131};
132
133static struct kunit_suite mptcp_token_suite = {
134	.name = "mptcp-token",
135	.test_cases = mptcp_token_test_cases,
136};
137
138kunit_test_suite(mptcp_token_suite);
139
140MODULE_LICENSE("GPL");