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