summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/bpf/test_socket_cookie.c
blob: e51d63786ff832ed9bb4b1647a98c2c80b9edf63 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook

#include <string.h>
#include <unistd.h>

#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <bpf/bpf.h>
#include <bpf/libbpf.h>

#include "bpf_rlimit.h"
#include "cgroup_helpers.h"

#define CG_PATH			"/foo"
#define SOCKET_COOKIE_PROG	"./socket_cookie_prog.o"

static int start_server(void)
{
	struct sockaddr_in6 addr;
	int fd;

	fd = socket(AF_INET6, SOCK_STREAM, 0);
	if (fd == -1) {
		log_err("Failed to create server socket");
		goto out;
	}

	memset(&addr, 0, sizeof(addr));
	addr.sin6_family = AF_INET6;
	addr.sin6_addr = in6addr_loopback;
	addr.sin6_port = 0;

	if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) == -1) {
		log_err("Failed to bind server socket");
		goto close_out;
	}

	if (listen(fd, 128) == -1) {
		log_err("Failed to listen on server socket");
		goto close_out;
	}

	goto out;

close_out:
	close(fd);
	fd = -1;
out:
	return fd;
}

static int connect_to_server(int server_fd)
{
	struct sockaddr_storage addr;
	socklen_t len = sizeof(addr);
	int fd;

	fd = socket(AF_INET6, SOCK_STREAM, 0);
	if (fd == -1) {
		log_err("Failed to create client socket");
		goto out;
	}

	if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
		log_err("Failed to get server addr");
		goto close_out;
	}

	if (connect(fd, (const struct sockaddr *)&addr, len) == -1) {
		log_err("Fail to connect to server");
		goto close_out;
	}

	goto out;

close_out:
	close(fd);
	fd = -1;
out:
	return fd;
}

static int validate_map(struct bpf_map *map, int client_fd)
{
	__u32 cookie_expected_value;
	struct sockaddr_in6 addr;
	socklen_t len = sizeof(addr);
	__u32 cookie_value;
	__u64 cookie_key;
	int err = 0;
	int map_fd;

	if (!map) {
		log_err("Map not found in BPF object");
		goto err;
	}

	map_fd = bpf_map__fd(map);

	err = bpf_map_get_next_key(map_fd, NULL, &cookie_key);
	if (err) {
		log_err("Can't get cookie key from map");
		goto out;
	}

	err = bpf_map_lookup_elem(map_fd, &cookie_key, &cookie_value);
	if (err) {
		log_err("Can't get cookie value from map");
		goto out;
	}

	err = getsockname(client_fd, (struct sockaddr *)&addr, &len);
	if (err) {
		log_err("Can't get client local addr");
		goto out;
	}

	cookie_expected_value = (ntohs(addr.sin6_port) << 8) | 0xFF;
	if (cookie_value != cookie_expected_value) {
		log_err("Unexpected value in map: %x != %x", cookie_value,
			cookie_expected_value);
		goto err;
	}

	goto out;
err:
	err = -1;
out:
	return err;
}

static int run_test(int cgfd)
{
	enum bpf_attach_type attach_type;
	struct bpf_prog_load_attr attr;
	struct bpf_program *prog;
	struct bpf_object *pobj;
	const char *prog_name;
	int server_fd = -1;
	int client_fd = -1;
	int prog_fd = -1;
	int err = 0;

	memset(&attr, 0, sizeof(attr));
	attr.file = SOCKET_COOKIE_PROG;
	attr.prog_type = BPF_PROG_TYPE_UNSPEC;

	err = bpf_prog_load_xattr(&attr, &pobj, &prog_fd);
	if (err) {
		log_err("Failed to load %s", attr.file);
		goto out;
	}

	bpf_object__for_each_program(prog, pobj) {
		prog_name = bpf_program__title(prog, /*needs_copy*/ false);

		if (libbpf_attach_type_by_name(prog_name, &attach_type))
			goto err;

		err = bpf_prog_attach(bpf_program__fd(prog), cgfd, attach_type,
				      BPF_F_ALLOW_OVERRIDE);
		if (err) {
			log_err("Failed to attach prog %s", prog_name);
			goto out;
		}
	}

	server_fd = start_server();
	if (server_fd == -1)
		goto err;

	client_fd = connect_to_server(server_fd);
	if (client_fd == -1)
		goto err;

	if (validate_map(bpf_map__next(NULL, pobj), client_fd))
		goto err;

	goto out;
err:
	err = -1;
out:
	close(client_fd);
	close(server_fd);
	bpf_object__close(pobj);
	printf("%s\n", err ? "FAILED" : "PASSED");
	return err;
}

int main(int argc, char **argv)
{
	int cgfd = -1;
	int err = 0;

	if (setup_cgroup_environment())
		goto err;

	cgfd = create_and_get_cgroup(CG_PATH);
	if (cgfd < 0)
		goto err;

	if (join_cgroup(CG_PATH))
		goto err;

	if (run_test(cgfd))
		goto err;

	goto out;
err:
	err = -1;
out:
	close(cgfd);
	cleanup_cgroup_environment();
	return err;
}