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	sock_net_set((struct sock *)req, &init_net);
 15	return req;
 16}
 17
 18static void mptcp_token_test_req_basic(struct kunit *test)
 19{
 20	struct mptcp_subflow_request_sock *req = build_req_sock(test);
 21	struct mptcp_sock *null_msk = NULL;
 22
 23	KUNIT_ASSERT_EQ(test, 0,
 24			mptcp_token_new_request((struct request_sock *)req));
 25	KUNIT_EXPECT_NE(test, 0, (int)req->token);
 26	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(&init_net, req->token));
 27
 28	/* cleanup */
 29	mptcp_token_destroy_request((struct request_sock *)req);
 30}
 31
 32static struct inet_connection_sock *build_icsk(struct kunit *test)
 33{
 34	struct inet_connection_sock *icsk;
 35
 36	icsk = kunit_kzalloc(test, sizeof(struct inet_connection_sock),
 37			     GFP_USER);
 38	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, icsk);
 39	return icsk;
 40}
 41
 42static struct mptcp_subflow_context *build_ctx(struct kunit *test)
 43{
 44	struct mptcp_subflow_context *ctx;
 45
 46	ctx = kunit_kzalloc(test, sizeof(struct mptcp_subflow_context),
 47			    GFP_USER);
 48	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, ctx);
 49	return ctx;
 50}
 51
 52static struct mptcp_sock *build_msk(struct kunit *test)
 53{
 54	struct mptcp_sock *msk;
 55
 56	msk = kunit_kzalloc(test, sizeof(struct mptcp_sock), GFP_USER);
 57	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, msk);
 58	refcount_set(&((struct sock *)msk)->sk_refcnt, 1);
 59	sock_net_set((struct sock *)msk, &init_net);
 60	return msk;
 61}
 62
 63static void mptcp_token_test_msk_basic(struct kunit *test)
 64{
 65	struct inet_connection_sock *icsk = build_icsk(test);
 66	struct mptcp_subflow_context *ctx = build_ctx(test);
 67	struct mptcp_sock *msk = build_msk(test);
 68	struct mptcp_sock *null_msk = NULL;
 69	struct sock *sk;
 70
 71	rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 72	ctx->conn = (struct sock *)msk;
 73	sk = (struct sock *)msk;
 74
 75	KUNIT_ASSERT_EQ(test, 0,
 76			mptcp_token_new_connect((struct sock *)icsk));
 77	KUNIT_EXPECT_NE(test, 0, (int)ctx->token);
 78	KUNIT_EXPECT_EQ(test, ctx->token, msk->token);
 79	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, ctx->token));
 80	KUNIT_EXPECT_EQ(test, 2, (int)refcount_read(&sk->sk_refcnt));
 81
 82	mptcp_token_destroy(msk);
 83	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(&init_net, ctx->token));
 84}
 85
 86static void mptcp_token_test_accept(struct kunit *test)
 87{
 88	struct mptcp_subflow_request_sock *req = build_req_sock(test);
 89	struct mptcp_sock *msk = build_msk(test);
 90
 91	KUNIT_ASSERT_EQ(test, 0,
 92			mptcp_token_new_request((struct request_sock *)req));
 93	msk->token = req->token;
 94	mptcp_token_accept(req, msk);
 95	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, msk->token));
 96
 97	/* this is now a no-op */
 98	mptcp_token_destroy_request((struct request_sock *)req);
 99	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, msk->token));
100
101	/* cleanup */
102	mptcp_token_destroy(msk);
103}
104
105static void mptcp_token_test_destroyed(struct kunit *test)
106{
107	struct mptcp_subflow_request_sock *req = build_req_sock(test);
108	struct mptcp_sock *msk = build_msk(test);
109	struct mptcp_sock *null_msk = NULL;
110	struct sock *sk;
111
112	sk = (struct sock *)msk;
113
114	KUNIT_ASSERT_EQ(test, 0,
115			mptcp_token_new_request((struct request_sock *)req));
116	msk->token = req->token;
117	mptcp_token_accept(req, msk);
118
119	/* simulate race on removal */
120	refcount_set(&sk->sk_refcnt, 0);
121	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(&init_net, msk->token));
122
123	/* cleanup */
124	mptcp_token_destroy(msk);
125}
126
127static struct kunit_case mptcp_token_test_cases[] = {
128	KUNIT_CASE(mptcp_token_test_req_basic),
129	KUNIT_CASE(mptcp_token_test_msk_basic),
130	KUNIT_CASE(mptcp_token_test_accept),
131	KUNIT_CASE(mptcp_token_test_destroyed),
132	{}
133};
134
135static struct kunit_suite mptcp_token_suite = {
136	.name = "mptcp-token",
137	.test_cases = mptcp_token_test_cases,
138};
139
140kunit_test_suite(mptcp_token_suite);
141
142MODULE_LICENSE("GPL");