tools/testing/selftests/bpf/test_tcpbpf_user.c

   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
  33 int 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
  60 int 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
  79 static 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
  92 int 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         if (setup_cgroup_environment())
 106                 goto err;
 107
 108         cg_fd = create_and_get_cgroup(cg_path);
 109         if (cg_fd < 0)
 110                 goto err;
 111
 112         if (join_cgroup(cg_path))
 113                 goto err;
 114
 115         if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
 116                 printf("FAILED: load_bpf_file failed for: %s\n", file);
 117                 goto err;
 118         }
 119
 120         rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
 121         if (rv) {
 122                 printf("FAILED: bpf_prog_attach: %d (%s)\n",
 123                        error, strerror(errno));
 124                 goto err;
 125         }
 126
 127         if (system("./tcp_server.py")) {
 128                 printf("FAILED: TCP server\n");
 129                 goto err;
 130         }
 131
 132         map_fd = bpf_find_map(__func__, obj, "global_map");
 133         if (map_fd < 0)
 134                 goto err;
 135
 136         sock_map_fd = bpf_find_map(__func__, obj, "sockopt_results");
 137         if (sock_map_fd < 0)
 138                 goto err;
 139
 140 retry_lookup:
 141         rv = bpf_map_lookup_elem(map_fd, &key, &g);
 142         if (rv != 0) {
 143                 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
 144                 goto err;
 145         }
 146
 147         if (g.num_close_events != EXPECTED_CLOSE_EVENTS && retry--) {
 148                 printf("Unexpected number of close events (%d), retrying!\n",
 149                        g.num_close_events);
 150                 usleep(100);
 151                 goto retry_lookup;
 152         }
 153
 154         if (verify_result(&g)) {
 155                 printf("FAILED: Wrong stats\n");
 156                 goto err;
 157         }
 158
 159         if (verify_sockopt_result(sock_map_fd)) {
 160                 printf("FAILED: Wrong sockopt stats\n");
 161                 goto err;
 162         }
 163
 164         printf("PASSED!\n");
 165         error = 0;
 166 err:
 167         bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
 168         close(cg_fd);
 169         cleanup_cgroup_environment();
 170         return error;
 171 }