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[test] Add self-tests for TCP/IP checksum calculation
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Michael Brown
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src/tests/tcpip_test.c
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213
src/tests/tcpip_test.c
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* TCP/IP self-tests
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*
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*/
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/* Forcibly enable assertions */
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#undef NDEBUG
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <ipxe/test.h>
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#include <ipxe/profile.h>
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#include <ipxe/tcpip.h>
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/** A TCP/IP fixed-data test */
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struct tcpip_test {
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/** Data */
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const void *data;
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/** Length of data */
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size_t len;
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};
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/** A TCP/IP pseudorandom-data test */
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struct tcpip_random_test {
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/** Seed */
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unsigned int seed;
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/** Length of data */
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size_t len;
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/** Alignment offset */
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size_t offset;
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};
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/** Define inline data */
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#define DATA(...) { __VA_ARGS__ }
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/** Define a TCP/IP fixed-data test */
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#define TCPIP_TEST( name, DATA ) \
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static const uint8_t __attribute__ (( aligned ( 16 ) )) \
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name ## _data[] = DATA; \
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static struct tcpip_test name = { \
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.data = name ## _data, \
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.len = sizeof ( name ## _data ), \
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}
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/** Define a TCP/IP pseudorandom-data test */
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#define TCPIP_RANDOM_TEST( name, SEED, LEN, OFFSET ) \
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static struct tcpip_random_test name = { \
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.seed = SEED, \
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.len = LEN, \
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.offset = OFFSET, \
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}
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/** Buffer for pseudorandom-data tests */
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static uint8_t __attribute__ (( aligned ( 16 ) ))
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tcpip_data[ 4096 + 7 /* offset */ ];
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/** Empty data */
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TCPIP_TEST ( empty, DATA() );
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/** Single byte */
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TCPIP_TEST ( one_byte, DATA ( 0xeb ) );
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/** Double byte */
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TCPIP_TEST ( two_bytes, DATA ( 0xba, 0xbe ) );
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/** Final wrap-around carry (big-endian) */
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TCPIP_TEST ( final_carry_big,
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DATA ( 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 ) );
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/** Final wrap-around carry (little-endian) */
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TCPIP_TEST ( final_carry_little,
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DATA ( 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00 ) );
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/** Random data (aligned) */
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TCPIP_RANDOM_TEST ( random_aligned, 0x12345678UL, 4096, 0 );
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/** Random data (unaligned, +1) */
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TCPIP_RANDOM_TEST ( random_unaligned_1, 0x12345678UL, 4096, 1 );
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/** Random data (unaligned, +2) */
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TCPIP_RANDOM_TEST ( random_unaligned_2, 0x12345678UL, 4096, 2 );
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/** Random data (aligned, truncated) */
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TCPIP_RANDOM_TEST ( random_aligned_truncated, 0x12345678UL, 4095, 0 );
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/** Random data (unaligned start and finish) */
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TCPIP_RANDOM_TEST ( partial, 0xcafebabe, 121, 5 );
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/**
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* Calculate TCP/IP checksum
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*
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* @v data Data to sum
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* @v len Length of data
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* @ret cksum Checksum
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*
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* This is a reference implementation taken from RFC1071 (and modified
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* to fix compilation without warnings under gcc).
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*/
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static uint16_t rfc_tcpip_chksum ( const void *data, size_t len ) {
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unsigned long sum = 0;
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while ( len > 1 ) {
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sum += *( ( uint16_t * ) data );
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data += 2;
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len -= 2;
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}
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if ( len > 0 )
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sum += *( ( uint8_t * ) data );
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while ( sum >> 16 )
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sum = ( ( sum & 0xffff ) + ( sum >> 16 ) );
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return ~sum;
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}
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/**
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* Report TCP/IP fixed-data test result
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*
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* @v test TCP/IP test
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*/
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#define tcpip_ok( test ) do { \
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uint16_t expected; \
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uint16_t generic_sum; \
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uint16_t sum; \
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expected = rfc_tcpip_chksum ( (test)->data, (test)->len ); \
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generic_sum = generic_tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, \
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(test)->data, \
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(test)->len ); \
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ok ( generic_sum == expected ); \
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sum = tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, (test)->data, \
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(test)->len ); \
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ok ( sum == expected ); \
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} while ( 0 )
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/**
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* Report TCP/IP pseudorandom-data test result
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*
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* @v test TCP/IP test
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*/
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#define tcpip_random_ok( test ) do { \
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uint8_t *data = ( tcpip_data + (test)->offset ); \
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uint16_t expected; \
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uint16_t generic_sum; \
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uint16_t sum; \
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unsigned long elapsed; \
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unsigned int i; \
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assert ( ( (test)->len + (test)->offset ) <= \
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sizeof ( tcpip_data ) ); \
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srandom ( (test)->seed ); \
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for ( i = 0 ; i < (test)->len ; i++ ) \
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data[i] = random(); \
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expected = rfc_tcpip_chksum ( data, (test)->len ); \
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generic_sum = generic_tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, \
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data, \
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(test)->len ); \
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ok ( generic_sum == expected ); \
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simple_profile(); \
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sum = tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, data, \
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(test)->len ); \
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elapsed = simple_profile(); \
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ok ( sum == expected ); \
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DBG ( "TCPIP checksummed %zd bytes (+%zd) in %ld ticks\n", \
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(test)->len, (test)->offset, elapsed ); \
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} while ( 0 )
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/**
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* Perform TCP/IP self-tests
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*
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*/
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static void tcpip_test_exec ( void ) {
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tcpip_ok ( &empty );
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tcpip_ok ( &one_byte );
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tcpip_ok ( &two_bytes );
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tcpip_ok ( &final_carry_big );
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tcpip_ok ( &final_carry_little );
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tcpip_random_ok ( &random_aligned );
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tcpip_random_ok ( &random_unaligned_1 );
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tcpip_random_ok ( &random_unaligned_2 );
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tcpip_random_ok ( &random_aligned_truncated );
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tcpip_random_ok ( &partial );
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}
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/** TCP/IP self-test */
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struct self_test tcpip_test __self_test = {
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.name = "tcpip",
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.exec = tcpip_test_exec,
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};
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@ -31,6 +31,7 @@ REQUIRE_OBJECT ( byteswap_test );
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REQUIRE_OBJECT ( base64_test );
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REQUIRE_OBJECT ( settings_test );
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REQUIRE_OBJECT ( time_test );
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REQUIRE_OBJECT ( tcpip_test );
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REQUIRE_OBJECT ( crc32_test );
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REQUIRE_OBJECT ( md5_test );
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REQUIRE_OBJECT ( sha1_test );
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