samples/bpf/test_map_in_map_user.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2017 Facebook
   4  */
   5 #include <sys/resource.h>
   6 #include <sys/socket.h>
   7 #include <arpa/inet.h>
   8 #include <stdint.h>
   9 #include <assert.h>
  10 #include <errno.h>
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <bpf/bpf.h>
  14 #include "bpf_load.h"
  15
  16 #define PORT_A          (map_fd[0])
  17 #define PORT_H          (map_fd[1])
  18 #define REG_RESULT_H    (map_fd[2])
  19 #define INLINE_RESULT_H (map_fd[3])
  20 #define A_OF_PORT_A     (map_fd[4]) /* Test case #0 */
  21 #define H_OF_PORT_A     (map_fd[5]) /* Test case #1 */
  22 #define H_OF_PORT_H     (map_fd[6]) /* Test case #2 */
  23
  24 static const char * const test_names[] = {
  25         "Array of Array",
  26         "Hash of Array",
  27         "Hash of Hash",
  28 };
  29
  30 #define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
  31
  32 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
  33 {
  34         struct bpf_map_info info = {};
  35         uint32_t info_len = sizeof(info);
  36         int ret, id;
  37
  38         ret = bpf_obj_get_info_by_fd(inner_map_fd, &info, &info_len);
  39         assert(!ret);
  40
  41         ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
  42         assert(!ret);
  43         assert(id == info.id);
  44 }
  45
  46 static void populate_map(uint32_t port_key, int magic_result)
  47 {
  48         int ret;
  49
  50         ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
  51         assert(!ret);
  52
  53         ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
  54                                   BPF_NOEXIST);
  55         assert(!ret);
  56
  57         ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
  58         assert(!ret);
  59         check_map_id(PORT_A, A_OF_PORT_A, port_key);
  60
  61         ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
  62         assert(!ret);
  63         check_map_id(PORT_A, H_OF_PORT_A, port_key);
  64
  65         ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
  66         assert(!ret);
  67         check_map_id(PORT_H, H_OF_PORT_H, port_key);
  68 }
  69
  70 static void test_map_in_map(void)
  71 {
  72         struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
  73         uint32_t result_key = 0, port_key;
  74         int result, inline_result;
  75         int magic_result = 0xfaceb00c;
  76         int ret;
  77         int i;
  78
  79         port_key = rand() & 0x00FF;
  80         populate_map(port_key, magic_result);
  81
  82         in6.sin6_addr.s6_addr16[0] = 0xdead;
  83         in6.sin6_addr.s6_addr16[1] = 0xbeef;
  84         in6.sin6_port = port_key;
  85
  86         for (i = 0; i < NR_TESTS; i++) {
  87                 printf("%s: ", test_names[i]);
  88
  89                 in6.sin6_addr.s6_addr16[7] = i;
  90                 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
  91                 assert(ret == -1 && errno == EBADF);
  92
  93                 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
  94                 assert(!ret);
  95
  96                 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
  97                                           &inline_result);
  98                 assert(!ret);
  99
 100                 if (result != magic_result || inline_result != magic_result) {
 101                         printf("Error. result:%d inline_result:%d\n",
 102                                result, inline_result);
 103                         exit(1);
 104                 }
 105
 106                 bpf_map_delete_elem(REG_RESULT_H, &result_key);
 107                 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
 108
 109                 printf("Pass\n");
 110         }
 111 }
 112
 113 int main(int argc, char **argv)
 114 {
 115         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 116         char filename[256];
 117
 118         assert(!setrlimit(RLIMIT_MEMLOCK, &r));
 119
 120         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 121
 122         if (load_bpf_file(filename)) {
 123                 printf("%s", bpf_log_buf);
 124                 return 1;
 125         }
 126
 127         test_map_in_map();
 128
 129         return 0;
 130 }