mirror of https://gerrit.osmocom.org/osmo-tetra
564 lines
16 KiB
C
564 lines
16 KiB
C
/* TETRA upper MAC layer main routine, above TMV-SAP */
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/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include "tetra_common.h"
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#include "tetra_prim.h"
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#include "tetra_upper_mac.h"
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#include "tetra_mac_pdu.h"
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#include "tetra_llc_pdu.h"
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#include "tetra_mm_pdu.h"
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#include "tetra_cmce_pdu.h"
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#include "tetra_sndcp_pdu.h"
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#include "tetra_mle_pdu.h"
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#include "tetra_gsmtap.h"
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static int rx_tm_sdu(struct tetra_mac_state *tms, struct msgb *msg, unsigned int len);
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/* FIXME move global fragslots to context variable */
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struct fragslot fragslots[FRAGSLOT_NR_SLOTS];
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void init_fragslot(struct fragslot *fragslot)
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{
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if (fragslot->msgb) {
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/* Should never be the case, but just to be sure */
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talloc_free(fragslot->msgb);
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memset(fragslot, 0, sizeof(struct fragslot));
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}
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fragslot->msgb = msgb_alloc(FRAGSLOT_MSGB_SIZE, "fragslot");
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}
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void cleanup_fragslot(struct fragslot *fragslot)
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{
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if (fragslot->msgb) {
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talloc_free(fragslot->msgb);
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}
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memset(fragslot, 0, sizeof(struct fragslot));
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}
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void age_fragslots()
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{
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int i;
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for (i = 0; i < FRAGSLOT_NR_SLOTS; i++) {
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if (fragslots[i].active) {
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fragslots[i].age++;
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if (fragslots[i].age > N203) {
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printf("\nFRAG: aged out old fragments for slot=%d fragments=%d length=%d timer=%d\n", i, fragslots[i].num_frags, fragslots[i].length, fragslots[i].age);
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cleanup_fragslot(&fragslots[i]);
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}
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}
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}
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}
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static int get_num_fill_bits(const unsigned char *l1h, int len_with_fillbits)
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{
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for (int i = 1; i < len_with_fillbits; i++) {
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if (l1h[len_with_fillbits - i] == 1) {
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return i;
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}
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}
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printf("WARNING get_fill_bits_len: no 1 bit within %d bytes from end\n", len_with_fillbits);
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return 0;
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}
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static int rx_bcast(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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struct msgb *msg = tmvp->oph.msg;
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struct tetra_si_decoded sid;
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uint32_t dl_freq, ul_freq;
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int i;
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memset(&sid, 0, sizeof(sid));
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macpdu_decode_sysinfo(&sid, msg->l1h);
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tmvp->u.unitdata.tdma_time.hn = sid.hyperframe_number;
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dl_freq = tetra_dl_carrier_hz(sid.freq_band,
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sid.main_carrier,
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sid.freq_offset);
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ul_freq = tetra_ul_carrier_hz(sid.freq_band,
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sid.main_carrier,
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sid.freq_offset,
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sid.duplex_spacing,
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sid.reverse_operation);
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printf("BNCH SYSINFO (DL %u Hz, UL %u Hz), service_details 0x%04x ",
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dl_freq, ul_freq, sid.mle_si.bs_service_details);
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if (sid.cck_valid_no_hf)
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printf("CCK ID %u", sid.cck_id);
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else
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printf("Hyperframe %u", sid.hyperframe_number);
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printf("\n");
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for (i = 0; i < 12; i++)
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printf("\t%s: %u\n", tetra_get_bs_serv_det_name(1 << i),
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sid.mle_si.bs_service_details & (1 << i) ? 1 : 0);
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memcpy(&tms->last_sid, &sid, sizeof(sid));
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return -1; /* FIXME check this indeed fills slot */
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}
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const char *tetra_alloc_dump(const struct tetra_chan_alloc_decoded *cad, struct tetra_mac_state *tms)
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{
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static char buf[64];
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char *cur = buf;
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unsigned int freq_band, freq_offset;
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if (cad->ext_carr_pres) {
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freq_band = cad->ext_carr.freq_band;
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freq_offset = cad->ext_carr.freq_offset;
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} else {
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freq_band = tms->last_sid.freq_band;
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freq_offset = tms->last_sid.freq_offset;
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}
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cur += sprintf(cur, "%s (TN%u/%s/%uHz)",
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tetra_get_alloc_t_name(cad->type), cad->timeslot,
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tetra_get_ul_dl_name(cad->ul_dl),
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tetra_dl_carrier_hz(freq_band, cad->carrier_nr, freq_offset));
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return buf;
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}
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/* Receive TL-SDU (LLC SDU == MLE PDU) */
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static int rx_tl_sdu(struct tetra_mac_state *tms, struct msgb *msg, unsigned int len)
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{
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uint8_t *bits = msg->l3h;
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uint8_t mle_pdisc = bits_to_uint(bits, 3);
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printf("TL-SDU(%s): %s", tetra_get_mle_pdisc_name(mle_pdisc),
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osmo_ubit_dump(bits, len));
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switch (mle_pdisc) {
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case TMLE_PDISC_MM:
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printf(" %s", tetra_get_mm_pdut_name(bits_to_uint(bits+3, 4), 0));
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break;
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case TMLE_PDISC_CMCE:
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printf(" %s", tetra_get_cmce_pdut_name(bits_to_uint(bits+3, 5), 0));
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break;
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case TMLE_PDISC_SNDCP:
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printf(" %s", tetra_get_sndcp_pdut_name(bits_to_uint(bits+3, 4), 0));
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printf(" NSAPI=%u PCOMP=%u, DCOMP=%u",
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bits_to_uint(bits+3+4, 4),
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bits_to_uint(bits+3+4+4, 4),
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bits_to_uint(bits+3+4+4+4, 4));
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printf(" V%u, IHL=%u",
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bits_to_uint(bits+3+4+4+4+4, 4),
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4*bits_to_uint(bits+3+4+4+4+4+4, 4));
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printf(" Proto=%u",
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bits_to_uint(bits+3+4+4+4+4+4+4+64, 8));
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break;
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case TMLE_PDISC_MLE:
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printf(" %s", tetra_get_mle_pdut_name(bits_to_uint(bits+3, 3), 0));
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break;
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default:
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break;
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}
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return len;
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}
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static int rx_tm_sdu(struct tetra_mac_state *tms, struct msgb *msg, unsigned int len)
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{
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struct tetra_llc_pdu lpp;
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uint8_t *bits = msg->l2h;
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memset(&lpp, 0, sizeof(lpp));
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tetra_llc_pdu_parse(&lpp, bits, len);
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printf("TM-SDU(%s,%u,%u)",
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tetra_get_llc_pdut_dec_name(lpp.pdu_type), lpp.ns, lpp.ss);
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if (lpp.have_fcs) {
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printf("(FCS: %s)", lpp.fcs_invalid ? "BAD" : "OK");
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}
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printf(": ");
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if (lpp.tl_sdu && lpp.ss == 0) {
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msg->l3h = lpp.tl_sdu;
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rx_tl_sdu(tms, msg, lpp.tl_sdu_len);
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}
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return len;
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}
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static int rx_resrc(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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struct msgb *msg = tmvp->oph.msg;
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struct tetra_resrc_decoded rsd;
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struct msgb *fragmsgb;
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int tmpdu_offset, slot;
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int pdu_bits; /* Full length of pdu, including fill bits */
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memset(&rsd, 0, sizeof(rsd));
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tmpdu_offset = macpdu_decode_resource(&rsd, msg->l1h, 0);
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if (rsd.macpdu_length == MACPDU_LEN_2ND_STOLEN) {
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pdu_bits = -1; /* Fills slot */
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printf("WARNING pdu with MACPDU_LEN_2ND_STOLEN, not implemented\n");
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} else if (rsd.macpdu_length == MACPDU_LEN_START_FRAG) {
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pdu_bits = -1; /* Fills slot */
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} else {
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pdu_bits = rsd.macpdu_length * 8; /* Length given */
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msg->tail = msg->head + pdu_bits;
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}
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/* Strip fill bits */
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if (rsd.fill_bits) {
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int num_fill_bits = get_num_fill_bits(msg->l1h, msgb_l1len(msg));
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msg->tail -= num_fill_bits;
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}
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/* We now have accurate length and start of TM-SDU, set LLC start in msg->l2h */
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msg->l2h = msg->l1h + tmpdu_offset;
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printf("RESOURCE Encr=%u, len=%d l1_len=%d l2_len %d Addr=%s ",
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rsd.encryption_mode, rsd.macpdu_length, msgb_l1len(msg), msgb_l2len(msg),
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tetra_addr_dump(&rsd.addr));
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if (rsd.addr.type == ADDR_TYPE_NULL) {
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pdu_bits = -1; /* No more PDUs in slot */
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goto out;
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}
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if (rsd.chan_alloc_pres)
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printf("ChanAlloc=%s ", tetra_alloc_dump(&rsd.cad, tms));
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if (rsd.slot_granting.pres)
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printf("SlotGrant=%u/%u ", rsd.slot_granting.nr_slots,
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rsd.slot_granting.delay);
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if (rsd.macpdu_length != MACPDU_LEN_START_FRAG || !REASSEMBLE_FRAGMENTS) {
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/* Non-fragmented resource (or no reassembly desired) */
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if (!rsd.is_encrypted) {
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rx_tm_sdu(tms, msg, msgb_l2len(msg));
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}
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} else {
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/* Fragmented resource */
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slot = tmvp->u.unitdata.tdma_time.tn;
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if (fragslots[slot].active) {
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printf("\nWARNING: fragment slot still active\n");
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cleanup_fragslot(&fragslots[slot]);
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}
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init_fragslot(&fragslots[slot]);
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fragmsgb = fragslots[slot].msgb;
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/* Copy l2 part to fragmsgb. l3h is constructed once all fragments are merged */
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fragmsgb->l1h = msgb_put(fragmsgb, msgb_l1len(msg));
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fragmsgb->l2h = fragmsgb->l1h + tmpdu_offset;
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fragmsgb->l3h = 0;
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memcpy(fragmsgb->l2h, msg->l2h, msgb_l2len(msg));
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printf("\nFRAG-START slot=%d len=%d msgb=%s\n", slot, msgb_l2len(fragmsgb), osmo_ubit_dump(fragmsgb->l2h, msgb_l2len(msg)));
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fragslots[slot].active = 1;
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fragslots[slot].num_frags = 1;
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fragslots[slot].length = msgb_l2len(msg);
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fragslots[slot].encryption = rsd.encryption_mode > 0;
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}
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tms->ssi = rsd.addr.ssi;
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out:
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printf("\n");
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return pdu_bits;
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}
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void append_frag_bits(int slot, uint8_t *bits, int bitlen)
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{
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struct msgb *fragmsgb;
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fragmsgb = fragslots[slot].msgb;
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if (fragmsgb->len + bitlen > fragmsgb->data_len) {
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printf(" WARNING: FRAG LENGTH ERROR!\n");
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return;
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}
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unsigned char *append_ptr = msgb_put(fragmsgb, bitlen);
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memcpy(append_ptr, bits, bitlen);
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fragslots[slot].length = fragslots[slot].length + bitlen;
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fragslots[slot].num_frags++;
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fragslots[slot].age = 0;
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}
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static int rx_macfrag(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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struct msgb *msg = tmvp->oph.msg;
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int slot = tmvp->u.unitdata.tdma_time.tn;
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uint8_t *bits = msg->l1h;
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uint8_t fillbits_present;
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int n = 0;
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int m = 0;
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if (fragslots[slot].active) {
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m = 2; n = n + m; /* MAC-FRAG/END (01) */
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m = 1; n = n + m; /* MAC-FRAG (0) */
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m = 1; fillbits_present = bits_to_uint(bits + n, m); n = n + m;
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msg->l2h = msg->l1h + n;
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/* MAC-FRAG will always fill remainder of the slot, but fill bits may be present */
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if (fillbits_present) {
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int num_fill_bits = get_num_fill_bits(msg->l1h, msgb_l1len(msg));
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msgb_get(msg, num_fill_bits);
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}
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/* Add frag to fragslot buffer */
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struct msgb *fragmsgb = fragslots[slot].msgb;
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append_frag_bits(slot, msg->l2h, msgb_l2len(msg));
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printf("FRAG-CONT slot=%d added=%d msgb=%s\n", slot, msgb_l2len(msg), osmo_ubit_dump(fragmsgb->l2h, msgb_l2len(fragmsgb)));
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} else {
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printf("WARNING got fragment without start packet for slot=%d\n", slot);
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}
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return -1; /* Always fills slot */
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}
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static int rx_macend(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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struct msgb *msg = tmvp->oph.msg;
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int slot = tmvp->u.unitdata.tdma_time.tn;
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struct tetra_resrc_decoded rsd;
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uint8_t *bits = msg->l1h;
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uint8_t fillbits_present, chanalloc_present, length_indicator, slot_granting;
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int num_fill_bits;
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struct msgb *fragmsgb;
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int n = 0;
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int m = 0;
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memset(&rsd, 0, sizeof(rsd));
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m = 2; n = n + m; /* MAC-FRAG/END (01) */
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m = 1; n = n + m; /* MAC-END (1) */
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m = 1; fillbits_present = bits_to_uint(bits + n, m); n = n + m;
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m = 1; n = n + m; /* position_of_grant */
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m = 6; length_indicator = bits_to_uint(bits + n, m); n = n + m;
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fragmsgb = fragslots[slot].msgb;
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if (fragslots[slot].active) {
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/* FIXME: handle napping bit in d8psk and qam */
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m = 1; slot_granting = bits_to_uint(bits + n, m); n = n + m;
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if (slot_granting) {
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/* FIXME: multiple slot granting in qam */
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m = 8; /* basic slot granting */ n = n + m;
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}
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m = 1; chanalloc_present = bits_to_uint(bits + n, m); n = n + m;
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/* Determine msg len, strip fill bits if any */
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msg->tail = msg->head + length_indicator * 8;
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if (fillbits_present) {
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num_fill_bits = get_num_fill_bits(msg->l1h, msgb_l1len(msg));
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msg->tail -= num_fill_bits;
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}
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/* Parse chanalloc element (if present) and update l2 offsets */
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if (chanalloc_present) {
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m = macpdu_decode_chan_alloc(&rsd.cad, bits + n); n = n + m;
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}
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msg->l2h = msg->l1h + n;
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append_frag_bits(slot, msg->l2h, msgb_l2len(msg));
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printf("FRAG-END slot=%d added=%d msgb=%s\n", slot, msgb_l2len(msg), osmo_ubit_dump(fragmsgb->l2h, msgb_l2len(fragmsgb)));
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/* Message is completed inside fragmsgb now */
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if (!fragslots[slot].encryption) {
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rx_tm_sdu(tms, fragmsgb, fragslots[slot].length);
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}
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} else {
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printf("FRAG: got end frag with len %d without start packet for slot=%d\n", length_indicator * 8, slot);
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}
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cleanup_fragslot(&fragslots[slot]);
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return length_indicator * 8;
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}
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static int rx_suppl(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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//struct tmv_unitdata_param *tup = &tmvp->u.unitdata;
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struct msgb *msg = tmvp->oph.msg;
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//struct tetra_suppl_decoded sud;
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int tmpdu_offset;
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#if 0
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memset(&sud, 0, sizeof(sud));
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tmpdu_offset = macpdu_decode_suppl(&sud, msg->l1h, tup->lchan);
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#else
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{
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uint8_t slot_granting = *(msg->l1h + 17);
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if (slot_granting)
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tmpdu_offset = 17+1+8;
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else
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tmpdu_offset = 17+1;
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}
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#endif
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printf("SUPPLEMENTARY MAC-D-BLOCK ");
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//if (sud.encryption_mode == 0)
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msg->l2h = msg->l1h + tmpdu_offset;
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rx_tm_sdu(tms, msg, 100);
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printf("\n");
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return -1; /* TODO FIXME check length */
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}
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static void dump_access(struct tetra_access_field *acc, unsigned int num)
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{
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printf("ACCESS%u: %c/%u ", num, 'A'+acc->access_code, acc->base_frame_len);
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}
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static void rx_aach(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
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{
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struct tmv_unitdata_param *tup = &tmvp->u.unitdata;
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struct tetra_acc_ass_decoded aad;
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printf("ACCESS-ASSIGN PDU: ");
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memset(&aad, 0, sizeof(aad));
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macpdu_decode_access_assign(&aad, tmvp->oph.msg->l1h,
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tup->tdma_time.fn == 18 ? 1 : 0);
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if (aad.pres & TETRA_ACC_ASS_PRES_ACCESS1)
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dump_access(&aad.access[0], 1);
|
|
if (aad.pres & TETRA_ACC_ASS_PRES_ACCESS2)
|
|
dump_access(&aad.access[1], 2);
|
|
if (aad.pres & TETRA_ACC_ASS_PRES_DL_USAGE)
|
|
printf("DL_USAGE: %s ", tetra_get_dl_usage_name(aad.dl_usage));
|
|
if (aad.pres & TETRA_ACC_ASS_PRES_UL_USAGE)
|
|
printf("UL_USAGE: %s ", tetra_get_ul_usage_name(aad.ul_usage));
|
|
|
|
/* save the state whether the current burst is traffic or not */
|
|
if (aad.dl_usage > 3)
|
|
tms->cur_burst.is_traffic = aad.dl_usage;
|
|
else
|
|
tms->cur_burst.is_traffic = 0;
|
|
|
|
printf("\n");
|
|
}
|
|
|
|
static int rx_tmv_unitdata_ind(struct tetra_tmvsap_prim *tmvp, struct tetra_mac_state *tms)
|
|
{
|
|
struct tmv_unitdata_param *tup = &tmvp->u.unitdata;
|
|
struct msgb *msg = tmvp->oph.msg;
|
|
uint8_t pdu_type = bits_to_uint(msg->l1h, 2);
|
|
const char *pdu_name;
|
|
struct msgb *gsmtap_msg;
|
|
int len_parsed;
|
|
|
|
if (tup->lchan == TETRA_LC_BSCH)
|
|
pdu_name = "SYNC";
|
|
else if (tup->lchan == TETRA_LC_AACH)
|
|
pdu_name = "ACCESS-ASSIGN";
|
|
else {
|
|
pdu_type = bits_to_uint(msg->l1h, 2);
|
|
pdu_name = tetra_get_macpdu_name(pdu_type);
|
|
}
|
|
|
|
printf("TMV-UNITDATA.ind %s %s CRC=%u %s\n",
|
|
tetra_tdma_time_dump(&tup->tdma_time),
|
|
tetra_get_lchan_name(tup->lchan),
|
|
tup->crc_ok, pdu_name);
|
|
|
|
if (!tup->crc_ok)
|
|
return -1;
|
|
|
|
gsmtap_msg = tetra_gsmtap_makemsg(&tup->tdma_time, tup->lchan,
|
|
tup->tdma_time.tn-1, /* expects timeslot in 0-3 range */
|
|
/* FIXME: */ 0, 0, 0,
|
|
msg->l1h, msgb_l1len(msg), tms);
|
|
if (gsmtap_msg)
|
|
tetra_gsmtap_sendmsg(gsmtap_msg);
|
|
|
|
/* age out old fragments */
|
|
if (REASSEMBLE_FRAGMENTS && tup->tdma_time.fn == 18) {
|
|
age_fragslots();
|
|
}
|
|
|
|
len_parsed = -1; /* Default for cases where slot is filled or otherwise irrelevant */
|
|
switch (tup->lchan) {
|
|
case TETRA_LC_AACH:
|
|
rx_aach(tmvp, tms);
|
|
break;
|
|
case TETRA_LC_BNCH:
|
|
case TETRA_LC_UNKNOWN:
|
|
case TETRA_LC_SCH_F:
|
|
switch (pdu_type) {
|
|
case TETRA_PDU_T_BROADCAST:
|
|
len_parsed = rx_bcast(tmvp, tms);
|
|
break;
|
|
case TETRA_PDU_T_MAC_RESOURCE:
|
|
len_parsed = rx_resrc(tmvp, tms);
|
|
break;
|
|
case TETRA_PDU_T_MAC_SUPPL:
|
|
len_parsed = rx_suppl(tmvp, tms);
|
|
break;
|
|
case TETRA_PDU_T_MAC_FRAG_END:
|
|
if (REASSEMBLE_FRAGMENTS) {
|
|
if (msg->l1h[2] == TETRA_MAC_FRAGE_FRAG) {
|
|
len_parsed = rx_macfrag(tmvp, tms);
|
|
} else {
|
|
len_parsed = rx_macend(tmvp, tms);
|
|
}
|
|
} else {
|
|
len_parsed = -1; /* Can't determine len */
|
|
if (msg->l1h[3] == TETRA_MAC_FRAGE_FRAG) {
|
|
printf("FRAG/END FRAG: ");
|
|
msg->l2h = msg->l1h+4;
|
|
rx_tm_sdu(tms, msg, 100 /*FIXME*/);
|
|
printf("\n");
|
|
} else {
|
|
printf("FRAG/END END\n");
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
len_parsed = -1; /* Can't determine len */
|
|
printf("STRANGE pdu=%u\n", pdu_type);
|
|
break;
|
|
}
|
|
break;
|
|
case TETRA_LC_BSCH:
|
|
break;
|
|
default:
|
|
printf("STRANGE lchan=%u\n", tup->lchan);
|
|
break;
|
|
}
|
|
|
|
return len_parsed;
|
|
}
|
|
|
|
int upper_mac_prim_recv(struct osmo_prim_hdr *op, void *priv)
|
|
{
|
|
struct tetra_tmvsap_prim *tmvp;
|
|
struct tetra_mac_state *tms = priv;
|
|
int pdu_bits = -1;
|
|
|
|
switch (op->sap) {
|
|
case TETRA_SAP_TMV:
|
|
tmvp = (struct tetra_tmvsap_prim *) op;
|
|
pdu_bits = rx_tmv_unitdata_ind(tmvp, tms);
|
|
break;
|
|
default:
|
|
printf("primitive on unknown sap\n");
|
|
break;
|
|
}
|
|
|
|
return pdu_bits;
|
|
}
|