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 #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
  30 int 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;
  53 err:
  54         return -1;
  55 }
  56
  57 int 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;
  73 err:
  74         return -1;
  75 }
  76
  77 static 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
  90 int 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;
 155 err:
 156         bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
 157         close(cg_fd);
 158         cleanup_cgroup_environment();
 159         return error;
 160 }