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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 <libc.h>
- #include <ip.h>
- /* from the kernel. Sorry. */
- enum {
- Nipht = 521, /* convenient prime */
- };
- uint32_t newiphash(uint8_t * sa, uint16_t sp, uint8_t * da, uint16_t dp)
- {
- uint32_t kludge;
- kludge =
- ((sa[IPaddrlen - 1] << 24) ^ (sp << 16) ^ (da[IPaddrlen - 1] << 8) ^
- dp);
- return kludge % Nipht;
- }
- 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.
- */
- int 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%lx, should be < 0x%lx\n",
- ohash, Nipht);
- nhash = newiphash(sa, sp, da, dp);
- if (nhash > Nipht)
- fprint(2, "newiphash returns bad value: 0x%lx, should be < 0x%lx\n",
- ohash, Nipht);
- fprint(2, "ohash is 0x%lx, nhash is 0x%lx\n", ohash, nhash);
- if (ohash == nhash) {
- exits("FAIL:iphash failed. ohash and nhash should differ\n");
- }
- /* Always print PASS at the end. */
- print("PASS\n");
- return 0;
- }
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