1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3
4#include <sys/types.h>
5#include <bpf/bpf.h>
6#include <bpf/libbpf.h>
7#include "test_progs.h"
8#include "network_helpers.h"
9#include "test_sk_storage_trace_itself.skel.h"
10#include "test_sk_storage_tracing.skel.h"
11
12#define LO_ADDR6 "::1"
13#define TEST_COMM "test_progs"
14
15struct sk_stg {
16	__u32 pid;
17	__u32 last_notclose_state;
18	char comm[16];
19};
20
21static struct test_sk_storage_tracing *skel;
22static __u32 duration;
23static pid_t my_pid;
24
25static int check_sk_stg(int sk_fd, __u32 expected_state)
26{
27	struct sk_stg sk_stg;
28	int err;
29
30	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.sk_stg_map), &sk_fd,
31				  &sk_stg);
32	if (!ASSERT_OK(err, "map_lookup(sk_stg_map)"))
33		return -1;
34
35	if (!ASSERT_EQ(sk_stg.last_notclose_state, expected_state,
36		       "last_notclose_state"))
37		return -1;
38
39	if (!ASSERT_EQ(sk_stg.pid, my_pid, "pid"))
40		return -1;
41
42	if (!ASSERT_STREQ(sk_stg.comm, skel->bss->task_comm, "task_comm"))
43		return -1;
44
45	return 0;
46}
47
48static void do_test(void)
49{
50	int listen_fd = -1, passive_fd = -1, active_fd = -1, value = 1, err;
51	char abyte;
52
53	listen_fd = start_server(AF_INET6, SOCK_STREAM, LO_ADDR6, 0, 0);
54	if (CHECK(listen_fd == -1, "start_server",
55		  "listen_fd:%d errno:%d\n", listen_fd, errno))
56		return;
57
58	active_fd = connect_to_fd(listen_fd, 0);
59	if (CHECK(active_fd == -1, "connect_to_fd", "active_fd:%d errno:%d\n",
60		  active_fd, errno))
61		goto out;
62
63	err = bpf_map_update_elem(bpf_map__fd(skel->maps.del_sk_stg_map),
64				  &active_fd, &value, 0);
65	if (!ASSERT_OK(err, "map_update(del_sk_stg_map)"))
66		goto out;
67
68	passive_fd = accept(listen_fd, NULL, 0);
69	if (CHECK(passive_fd == -1, "accept", "passive_fd:%d errno:%d\n",
70		  passive_fd, errno))
71		goto out;
72
73	shutdown(active_fd, SHUT_WR);
74	err = read(passive_fd, &abyte, 1);
75	if (!ASSERT_OK(err, "read(passive_fd)"))
76		goto out;
77
78	shutdown(passive_fd, SHUT_WR);
79	err = read(active_fd, &abyte, 1);
80	if (!ASSERT_OK(err, "read(active_fd)"))
81		goto out;
82
83	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.del_sk_stg_map),
84				  &active_fd, &value);
85	if (!ASSERT_ERR(err, "map_lookup(del_sk_stg_map)"))
86		goto out;
87
88	err = check_sk_stg(listen_fd, BPF_TCP_LISTEN);
89	if (!ASSERT_OK(err, "listen_fd sk_stg"))
90		goto out;
91
92	err = check_sk_stg(active_fd, BPF_TCP_FIN_WAIT2);
93	if (!ASSERT_OK(err, "active_fd sk_stg"))
94		goto out;
95
96	err = check_sk_stg(passive_fd, BPF_TCP_LAST_ACK);
97	ASSERT_OK(err, "passive_fd sk_stg");
98
99out:
100	if (active_fd != -1)
101		close(active_fd);
102	if (passive_fd != -1)
103		close(passive_fd);
104	if (listen_fd != -1)
105		close(listen_fd);
106}
107
108void serial_test_sk_storage_tracing(void)
109{
110	struct test_sk_storage_trace_itself *skel_itself;
111	int err;
112
113	my_pid = getpid();
114
115	skel_itself = test_sk_storage_trace_itself__open_and_load();
116
117	if (!ASSERT_NULL(skel_itself, "test_sk_storage_trace_itself")) {
118		test_sk_storage_trace_itself__destroy(skel_itself);
119		return;
120	}
121
122	skel = test_sk_storage_tracing__open_and_load();
123	if (!ASSERT_OK_PTR(skel, "test_sk_storage_tracing"))
124		return;
125
126	err = test_sk_storage_tracing__attach(skel);
127	if (!ASSERT_OK(err, "test_sk_storage_tracing__attach")) {
128		test_sk_storage_tracing__destroy(skel);
129		return;
130	}
131
132	do_test();
133
134	test_sk_storage_tracing__destroy(skel);
135}
136