tests/lib/compute_ip_checksum-test.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <tests/test.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <types.h>
   7 #include <ip_checksum.h>
   8
   9 static const uint8_t test_data_simple[] = {
  10         0x64, 0x3b, 0x33, 0x17, 0x34, 0x74, 0x62, 0x30, 0x75, 0x73, 0xf3, 0x11, 0x30, 0x2c,
  11         0x34, 0x35, 0x6d, 0x39, 0x69, 0x32, 0x23, 0x24, 0x76, 0x71, 0x77, 0x30, 0x39, 0x75,
  12         0x76, 0x35, 0x71, 0x32, 0x40, 0x46, 0x34, 0x34, 0xBB, 0x03, 0x66, 0x52};
  13 static const size_t test_data_simple_sz = ARRAY_SIZE(test_data_simple);
  14 static const unsigned long test_data_simple_checksum = 0x4267;
  15
  16 static uint8_t test_data_zeros[1024];
  17 static const size_t test_data_zeros_sz = ARRAY_SIZE(test_data_zeros);
  18 static const unsigned long test_data_zeros_checksum = 0xFFFF;
  19
  20 static int setup_test_group(void **state)
  21 {
  22         memset(test_data_zeros, 0, test_data_zeros_sz);
  23
  24         return 0;
  25 }
  26
  27 static void test_compute_ip_checksum_zero_length(void **state)
  28 {
  29         unsigned long res = compute_ip_checksum(test_data_simple, 0);
  30
  31         /* Expect checksum to be in initial state as there are were no data provided. */
  32         assert_int_equal(0xFFFF, res);
  33 }
  34
  35 static void test_compute_ip_checksum_zero_buffer(void **state)
  36 {
  37         unsigned long res = compute_ip_checksum(test_data_zeros, test_data_zeros_sz);
  38         assert_int_equal(test_data_zeros_checksum, res);
  39 }
  40
  41 static void test_compute_ip_checksum_simple_data(void **state)
  42 {
  43         unsigned long res;
  44         unsigned long check_res;
  45         const size_t helper_buffer_size = sizeof(uint8_t) * (test_data_simple_sz + 2);
  46         char *helper_buffer = malloc(helper_buffer_size);
  47
  48         /* Self test */
  49         assert_non_null(helper_buffer);
  50
  51         /* Expect function to generate the same checksum as stored in */
  52         res = compute_ip_checksum(test_data_simple, test_data_simple_sz);
  53         assert_int_equal(test_data_simple_checksum, res);
  54
  55         /* Copy test data and checksum to new buffer. Expect computed checksum to be zero,
  56            as it proves the data and the checksum are correct. */
  57         memcpy(helper_buffer, test_data_simple, test_data_simple_sz);
  58         helper_buffer[helper_buffer_size - 2] = res & 0xFF;
  59         helper_buffer[helper_buffer_size - 1] = (res >> 8) & 0xFF;
  60         check_res = compute_ip_checksum(helper_buffer, helper_buffer_size);
  61         assert_int_equal(0, check_res);
  62
  63         free(helper_buffer);
  64 }
  65
  66 static void test_add_ip_checksums_empty_values(void **state)
  67 {
  68         unsigned long res;
  69
  70         res = add_ip_checksums(0, 0xFFFF, 0xFFFF);
  71         assert_int_equal(0xFFFF, res);
  72
  73         res = add_ip_checksums(1, 0xFFFF, 0xFFFF);
  74         assert_int_equal(0xFFFF, res);
  75 }
  76
  77 static void test_add_ip_checksums(void **state)
  78 {
  79         unsigned long res_1 = compute_ip_checksum(test_data_simple, test_data_simple_sz / 2);
  80         unsigned long res_2 = compute_ip_checksum(test_data_simple + test_data_simple_sz / 2,
  81                                                   test_data_simple_sz / 2);
  82         unsigned long res_sum = add_ip_checksums(test_data_simple_sz / 2, res_1, res_2);
  83
  84         assert_int_equal(test_data_simple_checksum, res_sum);
  85 }
  86
  87 int main(void)
  88 {
  89         const struct CMUnitTest tests[] = {
  90                 cmocka_unit_test(test_compute_ip_checksum_zero_length),
  91                 cmocka_unit_test(test_compute_ip_checksum_zero_buffer),
  92                 cmocka_unit_test(test_compute_ip_checksum_simple_data),
  93
  94                 cmocka_unit_test(test_add_ip_checksums_empty_values),
  95                 cmocka_unit_test(test_add_ip_checksums),
  96         };
  97
  98         return cb_run_group_tests(tests, setup_test_group, NULL);
  99 }