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}