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	struct sock *sk;
 56
 57	msk = kunit_kzalloc(test, sizeof(struct mptcp_sock), GFP_USER);
 58	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, msk);
 59	refcount_set(&((struct sock *)msk)->sk_refcnt, 1);
 60	sock_net_set((struct sock *)msk, &init_net);
 61
 62	sk = (struct sock *)msk;
 63
 64	/* be sure the token helpers can dereference sk->sk_prot */
 65	sk->sk_prot = &tcp_prot;
 66	sk->sk_protocol = IPPROTO_MPTCP;
 67
 68	return msk;
 69}
 70
 71static void mptcp_token_test_msk_basic(struct kunit *test)
 72{
 73	struct inet_connection_sock *icsk = build_icsk(test);
 74	struct mptcp_subflow_context *ctx = build_ctx(test);
 75	struct mptcp_sock *msk = build_msk(test);
 76	struct mptcp_sock *null_msk = NULL;
 77	struct sock *sk;
 78
 79	rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 80	ctx->conn = (struct sock *)msk;
 81	sk = (struct sock *)msk;
 82
 83	KUNIT_ASSERT_EQ(test, 0,
 84			mptcp_token_new_connect((struct sock *)icsk));
 85	KUNIT_EXPECT_NE(test, 0, (int)ctx->token);
 86	KUNIT_EXPECT_EQ(test, ctx->token, msk->token);
 87	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, ctx->token));
 88	KUNIT_EXPECT_EQ(test, 2, (int)refcount_read(&sk->sk_refcnt));
 89
 90	mptcp_token_destroy(msk);
 91	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(&init_net, ctx->token));
 92}
 93
 94static void mptcp_token_test_accept(struct kunit *test)
 95{
 96	struct mptcp_subflow_request_sock *req = build_req_sock(test);
 97	struct mptcp_sock *msk = build_msk(test);
 98
 99	KUNIT_ASSERT_EQ(test, 0,
100			mptcp_token_new_request((struct request_sock *)req));
101	msk->token = req->token;
102	mptcp_token_accept(req, msk);
103	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, msk->token));
104
105	/* this is now a no-op */
106	mptcp_token_destroy_request((struct request_sock *)req);
107	KUNIT_EXPECT_PTR_EQ(test, msk, mptcp_token_get_sock(&init_net, msk->token));
108
109	/* cleanup */
110	mptcp_token_destroy(msk);
111}
112
113static void mptcp_token_test_destroyed(struct kunit *test)
114{
115	struct mptcp_subflow_request_sock *req = build_req_sock(test);
116	struct mptcp_sock *msk = build_msk(test);
117	struct mptcp_sock *null_msk = NULL;
118	struct sock *sk;
119
120	sk = (struct sock *)msk;
121
122	KUNIT_ASSERT_EQ(test, 0,
123			mptcp_token_new_request((struct request_sock *)req));
124	msk->token = req->token;
125	mptcp_token_accept(req, msk);
126
127	/* simulate race on removal */
128	refcount_set(&sk->sk_refcnt, 0);
129	KUNIT_EXPECT_PTR_EQ(test, null_msk, mptcp_token_get_sock(&init_net, msk->token));
130
131	/* cleanup */
132	mptcp_token_destroy(msk);
133}
134
135static struct kunit_case mptcp_token_test_cases[] = {
136	KUNIT_CASE(mptcp_token_test_req_basic),
137	KUNIT_CASE(mptcp_token_test_msk_basic),
138	KUNIT_CASE(mptcp_token_test_accept),
139	KUNIT_CASE(mptcp_token_test_destroyed),
140	{}
141};
142
143static struct kunit_suite mptcp_token_suite = {
144	.name = "mptcp-token",
145	.test_cases = mptcp_token_test_cases,
146};
147
148kunit_test_suite(mptcp_token_suite);
149
150MODULE_LICENSE("GPL");
151MODULE_DESCRIPTION("KUnit tests for MPTCP Token");