tcpip_test.c File Reference

TCP/IP self-tests. More...

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ipxe/test.h>
#include <ipxe/profile.h>
#include <ipxe/tcpip.h>

Go to the source code of this file.

Data Structures
struct	tcpip_test
	A TCP/IP fixed-data test. More...
struct	tcpip_random_test
	A TCP/IP pseudorandom-data test. More...

Macros
#define	PROFILE_COUNT   16
	Number of sample iterations for profiling. More...
#define	DATA(...)   { __VA_ARGS__ }
	Define inline data. More...
#define	TCPIP_TEST(name, DATA)
	Define a TCP/IP fixed-data test. More...
#define	TCPIP_RANDOM_TEST(name, SEED, LEN, OFFSET)
	Define a TCP/IP pseudorandom-data test. More...
#define	tcpip_ok(test)   tcpip_okx ( test, __FILE__, __LINE__ )
#define	tcpip_random_ok(test)   tcpip_random_okx ( test, __FILE__, __LINE__ )

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	TCPIP_TEST (empty, DATA())
	Empty data. More...
	TCPIP_TEST (one_byte, DATA(0xeb))
	Single byte. More...
	TCPIP_TEST (two_bytes, DATA(0xba, 0xbe))
	Double byte. More...
	TCPIP_TEST (positive_zero, DATA(0x00, 0x00))
	Positive zero data. More...
	TCPIP_TEST (negative_zero, DATA(0xff, 0xff))
	Negative zero data. More...
	TCPIP_TEST (final_carry_big, DATA(0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01))
	Final wrap-around carry (big-endian) More...
	TCPIP_TEST (final_carry_little, DATA(0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00))
	Final wrap-around carry (little-endian) More...
	TCPIP_RANDOM_TEST (random_aligned, 0x12345678UL, 4096, 0)
	Random data (aligned) More...
	TCPIP_RANDOM_TEST (random_unaligned_1, 0x12345678UL, 4096, 1)
	Random data (unaligned, +1) More...
	TCPIP_RANDOM_TEST (random_unaligned_2, 0x12345678UL, 4096, 2)
	Random data (unaligned, +2) More...
	TCPIP_RANDOM_TEST (random_aligned_truncated, 0x12345678UL, 4095, 0)
	Random data (aligned, truncated) More...
	TCPIP_RANDOM_TEST (partial, 0xcafebabe, 121, 5)
	Random data (unaligned start and finish) More...
static uint16_t	rfc_tcpip_chksum (const void *data, size_t len)
	Calculate TCP/IP checksum. More...
static void	tcpip_okx (struct tcpip_test *test, const char *file, unsigned int line)
	Report TCP/IP fixed-data test result. More...
static void	tcpip_random_okx (struct tcpip_random_test *test, const char *file, unsigned int line)
	Report TCP/IP pseudorandom-data test result. More...
static void	tcpip_test_exec (void)
	Perform TCP/IP self-tests. More...

Variables
static uint8_t	tcpip_data [4096+7]
	Buffer for pseudorandom-data tests. More...
struct self_test tcpip_test	__self_test
	TCP/IP self-test. More...

Detailed Description

TCP/IP self-tests.

Definition in file tcpip_test.c.

Macro Definition Documentation

PROFILE_COUNT

#define PROFILE_COUNT   16

Number of sample iterations for profiling.

Definition at line 44 of file tcpip_test.c.

DATA

#define DATA

(

...

)

{ __VA_ARGS__ }

Define inline data.

Definition at line 65 of file tcpip_test.c.

TCPIP_TEST

#define TCPIP_TEST	(		name,
			DATA
	)

Value:

static const uint8_t __attribute__ (( aligned ( 16 ) ))         \
                name ## _data[] = DATA;                                 \
        static struct tcpip_test name = {                               \
                .data = name ## _data,                                  \
                .len = sizeof ( name ## _data ),                        \
        }

Define a TCP/IP fixed-data test.

Definition at line 68 of file tcpip_test.c.

TCPIP_RANDOM_TEST

#define TCPIP_RANDOM_TEST	(		name,
			SEED,
			LEN,
			OFFSET
	)

Value:

static struct tcpip_random_test name = {                        \
                .seed = SEED,                                           \
                .len = LEN,                                             \
                .offset = OFFSET,                                       \
        }

Define a TCP/IP pseudorandom-data test.

Definition at line 77 of file tcpip_test.c.

tcpip_ok

#define tcpip_ok

(

test

)

tcpip_okx ( test, __FILE__, __LINE__ )

Definition at line 186 of file tcpip_test.c.

tcpip_random_ok

#define tcpip_random_ok

(

test

)

tcpip_random_okx ( test, __FILE__, __LINE__ )

Definition at line 234 of file tcpip_test.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

TCPIP_TEST() [1/7]

TCPIP_TEST	(	empty	,
		DATA()
	)

Empty data.

TCPIP_TEST() [2/7]

TCPIP_TEST	(	one_byte	,
		DATA(0xeb)
	)

Single byte.

TCPIP_TEST() [3/7]

TCPIP_TEST	(	two_bytes	,
		DATA(0xba, 0xbe)
	)

Double byte.

TCPIP_TEST() [4/7]

TCPIP_TEST	(	positive_zero	,
		DATA(0x00, 0x00)
	)

Positive zero data.

TCPIP_TEST() [5/7]

TCPIP_TEST	(	negative_zero	,
		DATA(0xff, 0xff)
	)

Negative zero data.

TCPIP_TEST() [6/7]

TCPIP_TEST	(	final_carry_big	,
		DATA(0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01)
	)

Final wrap-around carry (big-endian)

TCPIP_TEST() [7/7]

TCPIP_TEST	(	final_carry_little	,
		DATA(0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00)
	)

Final wrap-around carry (little-endian)

TCPIP_RANDOM_TEST() [1/5]

TCPIP_RANDOM_TEST	(	random_aligned	,
		0x12345678UL	,
		4096	,
		0
	)

Random data (aligned)

TCPIP_RANDOM_TEST() [2/5]

TCPIP_RANDOM_TEST	(	random_unaligned_1	,
		0x12345678UL	,
		4096	,
		1
	)

Random data (unaligned, +1)

TCPIP_RANDOM_TEST() [3/5]

TCPIP_RANDOM_TEST	(	random_unaligned_2	,
		0x12345678UL	,
		4096	,
		2
	)

Random data (unaligned, +2)

TCPIP_RANDOM_TEST() [4/5]

TCPIP_RANDOM_TEST	(	random_aligned_truncated	,
		0x12345678UL	,
		4095	,
		0
	)

Random data (aligned, truncated)

TCPIP_RANDOM_TEST() [5/5]

TCPIP_RANDOM_TEST	(	partial	,
		0xcafebabe	,
		121	,
		5
	)

Random data (unaligned start and finish)

rfc_tcpip_chksum()

static uint16_t rfc_tcpip_chksum ( const void *  data, size_t  len  )

static

Calculate TCP/IP checksum.

Parameters

data	Data to sum
len	Length of data

Return values

cksum

Checksum

This is a reference implementation taken from RFC1071 (and modified to fix compilation without warnings under gcc).

The initial value of the one's complement sum is changed from positive zero (0x0000) to negative zero (0xffff). This ensures that the return value will always use the positive representation of zero (0x0000). Without this change, the return value would use negative zero (0xffff) if the input data is zero length (or all zeros) but positive zero (0x0000) for any other data which sums to zero.

Definition at line 144 of file tcpip_test.c.

                                                                  {
        unsigned long sum = 0xffff;

        while ( len > 1 )  {
                sum += *( ( uint16_t * ) data );
                data += 2;
                len -= 2;
        }

        if ( len > 0 )
                sum += *( ( uint8_t * ) data );

        while ( sum >> 16 )
                sum = ( ( sum & 0xffff ) + ( sum >> 16 ) );

        assert ( sum != 0x0000 );
        return ~sum;
}

References assert(), data, and len.

Referenced by tcpip_okx(), and tcpip_random_okx().

tcpip_okx()

static void tcpip_okx ( struct tcpip_test *  test, const char *  file, unsigned int  line  )

static

Report TCP/IP fixed-data test result.

Parameters

test	TCP/IP test
file	Test code file
line	Test code line

Definition at line 170 of file tcpip_test.c.

                                            {
        uint16_t expected;
        uint16_t generic_sum;
        uint16_t sum;

        /* Verify generic_tcpip_continue_chksum() result */
        expected = rfc_tcpip_chksum ( test->data, test->len );
        generic_sum = generic_tcpip_continue_chksum ( TCPIP_EMPTY_CSUM,
                                                      test->data, test->len );
        okx ( generic_sum == expected, file, line );

        /* Verify optimised tcpip_continue_chksum() result */
        sum = tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, test->data, test->len );
        okx ( sum == expected, file, line );
}

References generic_tcpip_continue_chksum(), okx, rfc_tcpip_chksum(), tcpip_continue_chksum(), TCPIP_EMPTY_CSUM, and test.

tcpip_random_okx()

static void tcpip_random_okx ( struct tcpip_random_test *  test, const char *  file, unsigned int  line  )

static

Report TCP/IP pseudorandom-data test result.

Parameters

test	TCP/IP test
file	Test code file
line	Test code line

Definition at line 195 of file tcpip_test.c.

                                                                     {
        uint8_t *data = ( tcpip_data + test->offset );
        struct profiler profiler;
        uint16_t expected;
        uint16_t generic_sum;
        uint16_t sum;
        unsigned int i;

        /* Sanity check */
        assert ( ( test->len + test->offset ) <= sizeof ( tcpip_data ) );

        /* Generate random data */
        srandom ( test->seed );
        for ( i = 0 ; i < test->len ; i++ )
                data[i] = random();

        /* Verify generic_tcpip_continue_chksum() result */
        expected = rfc_tcpip_chksum ( data, test->len );
        generic_sum = generic_tcpip_continue_chksum ( TCPIP_EMPTY_CSUM,
                                                      data, test->len );
        okx ( generic_sum == expected, file, line );

        /* Verify optimised tcpip_continue_chksum() result */
        sum = tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, data, test->len );
        okx ( sum == expected, file, line );

        /* Profile optimised calculation */
        memset ( &profiler, 0, sizeof ( profiler ) );
        for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
                profile_start ( &profiler );
                sum = tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, data,
                                              test->len );
                profile_stop ( &profiler );
        }
        DBG ( "TCPIP checksummed %zd bytes (+%zd) in %ld +/- %ld ticks\n",
              test->len, test->offset, profile_mean ( &profiler ),
              profile_stddev ( &profiler ) );
}

References assert(), data, DBG, generic_tcpip_continue_chksum(), memset(), okx, PROFILE_COUNT, profile_mean(), profile_start(), profile_stddev(), profile_stop(), random(), rfc_tcpip_chksum(), srandom(), tcpip_continue_chksum(), tcpip_data, TCPIP_EMPTY_CSUM, and test.

tcpip_test_exec()

static void tcpip_test_exec ( void  )

static

Perform TCP/IP self-tests.

Definition at line 240 of file tcpip_test.c.

                                     {

        tcpip_ok ( &empty );
        tcpip_ok ( &one_byte );
        tcpip_ok ( &two_bytes );
        tcpip_ok ( &positive_zero );
        tcpip_ok ( &negative_zero );
        tcpip_ok ( &final_carry_big );
        tcpip_ok ( &final_carry_little );
        tcpip_random_ok ( &random_aligned );
        tcpip_random_ok ( &random_unaligned_1 );
        tcpip_random_ok ( &random_unaligned_2 );
        tcpip_random_ok ( &random_aligned_truncated );
        tcpip_random_ok ( &partial );
}

References tcpip_ok, and tcpip_random_ok.

Variable Documentation

tcpip_data

uint8_t tcpip_data[4096+7]

static

Buffer for pseudorandom-data tests.

Definition at line 86 of file tcpip_test.c.

Referenced by tcpip_random_okx().

__self_test

struct self_test tcpip_test __self_test

Initial value:

= {
        .name = "tcpip",
        .exec = tcpip_test_exec,
}

TCP/IP self-test.

Definition at line 257 of file tcpip_test.c.