1// SPDX-License-Identifier: GPL-2.0
2#include <inttypes.h>
3#include <stdio.h>
4#include <stdlib.h>
5#include <unistd.h>
6#include <errno.h>
7#include <string.h>
8#include <linux/bpf.h>
9#include <sys/types.h>
10#include <bpf/bpf.h>
11#include <bpf/libbpf.h>
12
13#include "bpf_rlimit.h"
14#include "bpf_util.h"
15#include "cgroup_helpers.h"
16
17#include "test_tcpbpf.h"
18
19/* 3 comes from one listening socket + both ends of the connection */
20#define EXPECTED_CLOSE_EVENTS		3
21
22#define EXPECT_EQ(expected, actual, fmt)			\
23	do {							\
24		if ((expected) != (actual)) {			\
25			printf("  Value of: " #actual "\n"	\
26			       "    Actual: %" fmt "\n"		\
27			       "  Expected: %" fmt "\n",	\
28			       (actual), (expected));		\
29			ret--;					\
30		}						\
31	} while (0)
32
33int verify_result(const struct tcpbpf_globals *result)
34{
35	__u32 expected_events;
36	int ret = 0;
37
38	expected_events = ((1 << BPF_SOCK_OPS_TIMEOUT_INIT) |
39			   (1 << BPF_SOCK_OPS_RWND_INIT) |
40			   (1 << BPF_SOCK_OPS_TCP_CONNECT_CB) |
41			   (1 << BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB) |
42			   (1 << BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB) |
43			   (1 << BPF_SOCK_OPS_NEEDS_ECN) |
44			   (1 << BPF_SOCK_OPS_STATE_CB) |
45			   (1 << BPF_SOCK_OPS_TCP_LISTEN_CB));
46
47	EXPECT_EQ(expected_events, result->event_map, "#" PRIx32);
48	EXPECT_EQ(501ULL, result->bytes_received, "llu");
49	EXPECT_EQ(1002ULL, result->bytes_acked, "llu");
50	EXPECT_EQ(1, result->data_segs_in, PRIu32);
51	EXPECT_EQ(1, result->data_segs_out, PRIu32);
52	EXPECT_EQ(0x80, result->bad_cb_test_rv, PRIu32);
53	EXPECT_EQ(0, result->good_cb_test_rv, PRIu32);
54	EXPECT_EQ(1, result->num_listen, PRIu32);
55	EXPECT_EQ(EXPECTED_CLOSE_EVENTS, result->num_close_events, PRIu32);
56
57	return ret;
58}
59
60int verify_sockopt_result(int sock_map_fd)
61{
62	__u32 key = 0;
63	int ret = 0;
64	int res;
65	int rv;
66
67	/* check setsockopt for SAVE_SYN */
68	rv = bpf_map_lookup_elem(sock_map_fd, &key, &res);
69	EXPECT_EQ(0, rv, "d");
70	EXPECT_EQ(0, res, "d");
71	key = 1;
72	/* check getsockopt for SAVED_SYN */
73	rv = bpf_map_lookup_elem(sock_map_fd, &key, &res);
74	EXPECT_EQ(0, rv, "d");
75	EXPECT_EQ(1, res, "d");
76	return ret;
77}
78
79static int bpf_find_map(const char *test, struct bpf_object *obj,
80			const char *name)
81{
82	struct bpf_map *map;
83
84	map = bpf_object__find_map_by_name(obj, name);
85	if (!map) {
86		printf("%s:FAIL:map '%s' not found\n", test, name);
87		return -1;
88	}
89	return bpf_map__fd(map);
90}
91
92int main(int argc, char **argv)
93{
94	const char *file = "test_tcpbpf_kern.o";
95	int prog_fd, map_fd, sock_map_fd;
96	struct tcpbpf_globals g = {0};
97	const char *cg_path = "/foo";
98	int error = EXIT_FAILURE;
99	struct bpf_object *obj;
100	int cg_fd = -1;
101	int retry = 10;
102	__u32 key = 0;
103	int rv;
104
105	cg_fd = cgroup_setup_and_join(cg_path);
106	if (cg_fd < 0)
107		goto err;
108
109	if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
110		printf("FAILED: load_bpf_file failed for: %s\n", file);
111		goto err;
112	}
113
114	rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
115	if (rv) {
116		printf("FAILED: bpf_prog_attach: %d (%s)\n",
117		       error, strerror(errno));
118		goto err;
119	}
120
121	if (system("./tcp_server.py")) {
122		printf("FAILED: TCP server\n");
123		goto err;
124	}
125
126	map_fd = bpf_find_map(__func__, obj, "global_map");
127	if (map_fd < 0)
128		goto err;
129
130	sock_map_fd = bpf_find_map(__func__, obj, "sockopt_results");
131	if (sock_map_fd < 0)
132		goto err;
133
134retry_lookup:
135	rv = bpf_map_lookup_elem(map_fd, &key, &g);
136	if (rv != 0) {
137		printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
138		goto err;
139	}
140
141	if (g.num_close_events != EXPECTED_CLOSE_EVENTS && retry--) {
142		printf("Unexpected number of close events (%d), retrying!\n",
143		       g.num_close_events);
144		usleep(100);
145		goto retry_lookup;
146	}
147
148	if (verify_result(&g)) {
149		printf("FAILED: Wrong stats\n");
150		goto err;
151	}
152
153	if (verify_sockopt_result(sock_map_fd)) {
154		printf("FAILED: Wrong sockopt stats\n");
155		goto err;
156	}
157
158	printf("PASSED!\n");
159	error = 0;
160err:
161	bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
162	close(cg_fd);
163	cleanup_cgroup_environment();
164	return error;
165}
166