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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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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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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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+
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+/* Forcibly enable assertions */
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+#undef NDEBUG
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+
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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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+
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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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+
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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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+
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+/** Define inline data */
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+#define DATA(...) { __VA_ARGS__ }
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+
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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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+
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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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+
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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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+
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+/** Empty data */
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+TCPIP_TEST ( empty, DATA() );
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+
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+/** Single byte */
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+TCPIP_TEST ( one_byte, DATA ( 0xeb ) );
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+
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+/** Double byte */
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+TCPIP_TEST ( two_bytes, DATA ( 0xba, 0xbe ) );
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+
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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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+
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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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+
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+/** Random data (aligned) */
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+TCPIP_RANDOM_TEST ( random_aligned, 0x12345678UL, 4096, 0 );
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+
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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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+
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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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+
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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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+
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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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+/**
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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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+
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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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+
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+ if ( len > 0 )
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+ sum += *( ( uint8_t * ) data );
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+
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+ while ( sum >> 16 )
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+ sum = ( ( sum & 0xffff ) + ( sum >> 16 ) );
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+
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+ return ~sum;
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+}
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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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+/**
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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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+/**
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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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+
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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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+
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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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