2 files changed, 103 insertions, 0 deletions
diff --git a/tests/commonlib/bsd/Makefile.mk b/tests/commonlib/bsd/Makefile.mk
index bf17b6d56dbb..3de223e70738 100644
--- a/tests/commonlib/bsd/Makefile.mk
+++ b/tests/commonlib/bsd/Makefile.mk
@@ -2,8 +2,12 @@
 
 tests-y += helpers-test
 tests-y += gcd-test
+tests-y += ipchksum-test
 
 helpers-test-srcs += tests/commonlib/bsd/helpers-test.c
 
 gcd-test-srcs += tests/commonlib/bsd/gcd-test.c
 gcd-test-srcs += src/commonlib/bsd/gcd.c
+
+ipchksum-test-srcs += tests/commonlib/bsd/ipchksum-test.c
+ipchksum-test-srcs += src/commonlib/bsd/ipchksum.c
diff --git a/tests/commonlib/bsd/ipchksum-test.c b/tests/commonlib/bsd/ipchksum-test.c
new file mode 100644
index 000000000000..2aed94c0cf2d
--- /dev/null
+++ b/tests/commonlib/bsd/ipchksum-test.c
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <commonlib/bsd/ipchksum.h>
+#include <tests/test.h>
+#include <string.h>
+#include <stdlib.h>
+#include <types.h>
+
+static const uint8_t test_data_simple[] = {
+	0x64, 0x3b, 0x33, 0x17, 0x34, 0x74, 0x62, 0x30, 0x75, 0x73, 0xf3, 0x11, 0x30, 0x2c,
+	0x34, 0x35, 0x6d, 0x39, 0x69, 0x32, 0x23, 0x24, 0x76, 0x71, 0x77, 0x30, 0x39, 0x75,
+	0x76, 0x35, 0x71, 0x32, 0x40, 0x46, 0x34, 0x34, 0xBB, 0x03, 0x66, 0x52};
+static const size_t test_data_simple_sz = ARRAY_SIZE(test_data_simple);
+static const uint16_t test_data_simple_checksum = 0x4267;
+
+static uint8_t test_data_zeros[1024];
+static const size_t test_data_zeros_sz = ARRAY_SIZE(test_data_zeros);
+static const uint16_t test_data_zeros_checksum = 0xFFFF;
+
+static int setup_test_group(void **state)
+{
+	memset(test_data_zeros, 0, test_data_zeros_sz);
+
+	return 0;
+}
+
+static void test_ipchksum_zero_length(void **state)
+{
+	uint16_t res = ipchksum(test_data_simple, 0);
+
+	/* Expect checksum to be in initial state as there are were no data provided. */
+	assert_int_equal(0xFFFF, res);
+}
+
+static void test_ipchksum_zero_buffer(void **state)
+{
+	uint16_t res = ipchksum(test_data_zeros, test_data_zeros_sz);
+	assert_int_equal(test_data_zeros_checksum, res);
+}
+
+static void test_ipchksum_simple_data(void **state)
+{
+	uint16_t res;
+	uint16_t check_res;
+	const size_t helper_buffer_size = sizeof(uint8_t) * (test_data_simple_sz + 2);
+	char *helper_buffer = malloc(helper_buffer_size);
+
+	/* Self test */
+	assert_non_null(helper_buffer);
+
+	/* Expect function to generate the same checksum as stored in */
+	res = ipchksum(test_data_simple, test_data_simple_sz);
+	assert_int_equal(test_data_simple_checksum, res);
+
+	/* Copy test data and checksum to new buffer. Expect computed checksum to be zero,
+	   as it proves the data and the checksum are correct. */
+	memcpy(helper_buffer, test_data_simple, test_data_simple_sz);
+	helper_buffer[helper_buffer_size - 2] = res & 0xFF;
+	helper_buffer[helper_buffer_size - 1] = (res >> 8) & 0xFF;
+	check_res = ipchksum(helper_buffer, helper_buffer_size);
+	assert_int_equal(0, check_res);
+
+	free(helper_buffer);
+}
+
+static void test_ipchksum_add_empty_values(void **state)
+{
+	uint16_t res;
+
+	res = ipchksum_add(0, 0xFFFF, 0xFFFF);
+	assert_int_equal(0xFFFF, res);
+
+	res = ipchksum_add(1, 0xFFFF, 0xFFFF);
+	assert_int_equal(0xFFFF, res);
+}
+
+static void test_ipchksum_add(void **state)
+{
+	uint16_t res_1 = ipchksum(test_data_simple, test_data_simple_sz / 2);
+	uint16_t res_2 = ipchksum(test_data_simple + test_data_simple_sz / 2,
+						  test_data_simple_sz / 2);
+	uint16_t res_sum = ipchksum_add(test_data_simple_sz / 2, res_1, res_2);
+
+	assert_int_equal(test_data_simple_checksum, res_sum);
+}
+
+int main(void)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_ipchksum_zero_length),
+		cmocka_unit_test(test_ipchksum_zero_buffer),
+		cmocka_unit_test(test_ipchksum_simple_data),
+
+		cmocka_unit_test(test_ipchksum_add_empty_values),
+		cmocka_unit_test(test_ipchksum_add),
+	};
+
+	return cb_run_group_tests(tests, setup_test_group, NULL);
+}