jehanne/qa/kern/iphash.c

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/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <lib9.h>
#include <ip.h>
/* from the kernel. Sorry. */
enum {
Nipht = 521, /* convenient prime */
};
/* Jehanne iphash() from ip/ipaux.c */
uint32_t
iphash(uint8_t *sa, uint16_t sp, uint8_t *da, uint16_t dp)
{
return (((uint32_t)(sa[IPaddrlen-1])<<24) ^ (sp << 16) ^ (((uint32_t)da[IPaddrlen-1])<<8) ^ dp ) % Nipht;
}
/* old Nix iphash (worked with kenc) */
uint32_t oldiphash(uint8_t * sa, uint16_t sp, uint8_t * da, uint16_t dp)
{
return ((sa[IPaddrlen - 1] << 24) ^ (sp << 16) ^ (da[IPaddrlen - 1] << 8) ^
dp) % Nipht;
}
/* conventions.
* informational messages go on fd 2.
* PASS/FAIL go on fd 1 and there is only ever one of each.
* The first four characters of passing tests are PASS
* The first four characters of failing tests are FAIL
* It is an error to print both PASS and FAIL
* FAIL tests should exits() with a message
* We may consider not printing PASS/FAIL and using exits instead.
*/
void
main()
{
static uint8_t sa[IPaddrlen] = { 0x80, };
static uint8_t da[IPaddrlen];
uint16_t sp = 4;
uint16_t dp = 5;
uint32_t ohash, nhash;
sa[IPaddrlen - 1] = 0x80;
ohash = oldiphash(sa, sp, da, dp);
if (ohash > Nipht)
fprint(2, "oldiphash returns bad value: 0x%ulx, should be < 0x%ulx\n",
ohash, Nipht);
nhash = iphash(sa, sp, da, dp);
if (nhash > Nipht)
fprint(2, "iphash returns bad value: 0x%ulx, should be < 0x%ulx\n",
ohash, Nipht);
fprint(2, "ohash is 0x%ulx, nhash is 0x%ulx\n", ohash, nhash);
if (ohash == nhash) {
/* ohash and nhash should differs on gcc due to type promotion rules */
fprint(2, "FAIL: iphash equals\n");
exits("FAIL");
}
/* Always print PASS at the end. */
print("PASS\n");
exits("PASS");
}