177 lines
4.1 KiB
C++
177 lines
4.1 KiB
C++
/* Frame number calculation test */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "bts.h"
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#include <string.h>
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#include <stdio.h>
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extern "C" {
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#include <osmocom/core/application.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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}
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#define RFN_MODULUS 42432
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/* globals used by the code */ void *tall_pcu_ctx;
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int16_t spoof_mnc = 0, spoof_mcc = 0;
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bool spoof_mnc_3_digits = false;
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static uint32_t calc_fn(BTS * bts, uint32_t rfn)
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{
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uint32_t fn;
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fn = bts->rfn_to_fn(rfn);
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printf("rfn=%i ==> fn=%i\n", rfn, fn);
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return fn;
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}
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static void set_fn(BTS * bts, uint32_t fn)
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{
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printf("\n");
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bts->set_current_frame_number(fn);
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printf("bts: fn=%i\n", fn);
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}
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static void run_test()
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{
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BTS bts;
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uint32_t fn;
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printf("RFN_MODULUS=%i\n",RFN_MODULUS);
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printf("GSM_MAX_FN=%i\n",GSM_MAX_FN);
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/* Test with a collection of real world examples,
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* all all of them are not critical and do not
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* assume the occurence of any race contions */
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set_fn(&bts, 1320462);
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fn = calc_fn(&bts, 5066);
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OSMO_ASSERT(fn == 1320458);
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set_fn(&bts, 8246);
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fn = calc_fn(&bts, 8244);
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OSMO_ASSERT(fn == 8244);
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set_fn(&bts, 10270);
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fn = calc_fn(&bts, 10269);
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OSMO_ASSERT(fn == 10269);
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set_fn(&bts, 311276);
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fn = calc_fn(&bts, 14250);
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OSMO_ASSERT(fn == 311274);
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/* Now lets assume a case where the frame number
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* just wrapped over a little bit above the
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* modulo 42432 raster, but the rach request
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* occurred before the wrapping */
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set_fn(&bts, RFN_MODULUS + 30);
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fn = calc_fn(&bts, RFN_MODULUS - 10);
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OSMO_ASSERT(fn == 42422);
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set_fn(&bts, RFN_MODULUS + 1);
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fn = calc_fn(&bts, RFN_MODULUS - 1);
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OSMO_ASSERT(fn == 42431);
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set_fn(&bts, RFN_MODULUS * 123 + 16);
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fn = calc_fn(&bts, RFN_MODULUS - 4);
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OSMO_ASSERT(fn == 5219132);
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set_fn(&bts, RFN_MODULUS * 123 + 451);
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fn = calc_fn(&bts, RFN_MODULUS - 175);
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OSMO_ASSERT(fn == 5218961);
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/* Lets check a special cornercase. We assume that
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* the BTS just wrapped its internal frame number
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* but we still get rach requests with high relative
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* frame numbers. */
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set_fn(&bts, 0);
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fn = calc_fn(&bts, RFN_MODULUS - 13);
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OSMO_ASSERT(fn == 2715635);
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set_fn(&bts, 453);
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fn = calc_fn(&bts, RFN_MODULUS - 102);
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OSMO_ASSERT(fn == 2715546);
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set_fn(&bts, 10);
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fn = calc_fn(&bts, RFN_MODULUS - 10);
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OSMO_ASSERT(fn == 2715638);
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set_fn(&bts, 23);
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fn = calc_fn(&bts, RFN_MODULUS - 42);
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OSMO_ASSERT(fn == 2715606);
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/* Also check with some corner case
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* values where Fn and RFn reach its
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* maximum/minimum valid range */
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set_fn(&bts, GSM_MAX_FN);
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fn = calc_fn(&bts, RFN_MODULUS-1);
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OSMO_ASSERT(fn == GSM_MAX_FN-1);
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set_fn(&bts, 0);
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fn = calc_fn(&bts, RFN_MODULUS-1);
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OSMO_ASSERT(fn == GSM_MAX_FN-1);
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set_fn(&bts, GSM_MAX_FN);
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fn = calc_fn(&bts, 0);
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OSMO_ASSERT(fn == GSM_MAX_FN);
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set_fn(&bts, 0);
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fn = calc_fn(&bts, 0);
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OSMO_ASSERT(fn == 0);
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}
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int main(int argc, char **argv)
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{
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tall_pcu_ctx = talloc_named_const(NULL, 1, "fn test context");
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if (!tall_pcu_ctx)
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abort();
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msgb_talloc_ctx_init(tall_pcu_ctx, 0);
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osmo_init_logging2(tall_pcu_ctx, &gprs_log_info);
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log_set_use_color(osmo_stderr_target, 0);
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log_set_print_filename(osmo_stderr_target, 0);
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log_set_log_level(osmo_stderr_target, LOGL_DEBUG);
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run_test();
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return EXIT_SUCCESS;
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}
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/*
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* stubs that should not be reached
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*/
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extern "C" {
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void l1if_pdch_req() {
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abort();
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} void l1if_connect_pdch() {
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abort();
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}
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void l1if_close_pdch() {
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abort();
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}
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void l1if_open_pdch() {
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abort();
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}
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}
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