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 static int bpf_find_map(const char *test, struct bpf_object *obj,
  58                         const char *name)
  59 {
  60         struct bpf_map *map;
  61
  62         map = bpf_object__find_map_by_name(obj, name);
  63         if (!map) {
  64                 printf("%s:FAIL:map '%s' not found\n", test, name);
  65                 return -1;
  66         }
  67         return bpf_map__fd(map);
  68 }
  69
  70 int main(int argc, char **argv)
  71 {
  72         const char *file = "test_tcpbpf_kern.o";
  73         struct tcpbpf_globals g = {0};
  74         const char *cg_path = "/foo";
  75         int error = EXIT_FAILURE;
  76         struct bpf_object *obj;
  77         int prog_fd, map_fd;
  78         int cg_fd = -1;
  79         __u32 key = 0;
  80         int rv;
  81
  82         if (setup_cgroup_environment())
  83                 goto err;
  84
  85         cg_fd = create_and_get_cgroup(cg_path);
  86         if (!cg_fd)
  87                 goto err;
  88
  89         if (join_cgroup(cg_path))
  90                 goto err;
  91
  92         if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
  93                 printf("FAILED: load_bpf_file failed for: %s\n", file);
  94                 goto err;
  95         }
  96
  97         rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
  98         if (rv) {
  99                 printf("FAILED: bpf_prog_attach: %d (%s)\n",
 100                        error, strerror(errno));
 101                 goto err;
 102         }
 103
 104         if (system("./tcp_server.py")) {
 105                 printf("FAILED: TCP server\n");
 106                 goto err;
 107         }
 108
 109         map_fd = bpf_find_map(__func__, obj, "global_map");
 110         if (map_fd < 0)
 111                 goto err;
 112
 113         rv = bpf_map_lookup_elem(map_fd, &key, &g);
 114         if (rv != 0) {
 115                 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
 116                 goto err;
 117         }
 118
 119         if (verify_result(&g)) {
 120                 printf("FAILED: Wrong stats\n");
 121                 goto err;
 122         }
 123
 124         printf("PASSED!\n");
 125         error = 0;
 126 err:
 127         bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
 128         close(cg_fd);
 129         cleanup_cgroup_environment();
 130         return error;
 131 }