net/mptcp/token_test.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <kunit/test.h>
   3
   4 #include "protocol.h"
   5
   6 static 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
  18 static 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
  32 static 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
  42 static 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
  52 static 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
  71 static 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
  94 static 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
 113 static 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
 135 static 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
 143 static struct kunit_suite mptcp_token_suite = {
 144         .name = "mptcp-token",
 145         .test_cases = mptcp_token_test_cases,
 146 };
 147
 148 kunit_test_suite(mptcp_token_suite);
 149
 150 MODULE_LICENSE("GPL");
 151 MODULE_DESCRIPTION("KUnit tests for MPTCP Token");