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gprs_rlcmac_data.cpp
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/* Data block transfer
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gprs_bssgp_pcu.h>
#include <gprs_rlcmac.h>
#include <pcu_l1_if.h>
extern void *tall_pcu_ctx;
extern "C" {
int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli,
uint8_t num_frames, uint32_t num_octets);
}
/* After receiving these frames, we send ack/nack. */
#define SEND_ACK_AFTER_FRAMES 20
/* After sending these frames, we poll for ack/nack. */
#define POLL_ACK_AFTER_FRAMES 20
/* If acknowledgement to uplink/downlink assignmentshould be polled */
#define POLLING_ASSIGNMENT_DL 1
#define POLLING_ASSIGNMENT_UL 1
extern "C" {
/* TS 04.60 10.2.2 */
struct rlc_ul_header {
uint8_t r:1,
si:1,
cv:4,
pt:2;
uint8_t ti:1,
tfi:5,
pi:1,
spare:1;
uint8_t e:1,
bsn:7;
} __attribute__ ((packed));
struct rlc_dl_header {
uint8_t usf:3,
s_p:1,
rrbp:2,
pt:2;
uint8_t fbi:1,
tfi:5,
pr:2;
uint8_t e:1,
bsn:7;
} __attribute__ ((packed));
struct rlc_li_field {
uint8_t e:1,
m:1,
li:6;
} __attribute__ ((packed));
}
static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll,
char *imsi);
static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf)
{
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n");
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n");
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n");
else if (tbf->direction == GPRS_RLCMAC_UL_TBF)
LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n");
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK)))
LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n");
else if (tbf->direction == GPRS_RLCMAC_DL_TBF)
LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n");
return 0;
}
int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf)
{
LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi);
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
"PACKET CONTROL ACK for PACKET UPLINK ACK\n");
gprs_rlcmac_diag(tbf);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
}
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
debug_diagram(tbf->diag, "timeout UL-ACK");
if (tbf->state == GPRS_RLCMAC_FINISHED) {
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
tbf->dir.ul.n3103++;
if (tbf->dir.ul.n3103 == bts->n3103) {
LOGP(DRLCMAC, LOGL_NOTICE,
"- N3103 exceeded\n");
debug_diagram(tbf->diag, "N3103 exceeded");
tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
tbf_timer_start(tbf, 3169, bts->t3169, 0);
return 0;
}
/* reschedule UL ack */
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK;
}
} else
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
"PACKET CONTROL ACK for PACKET UPLINK "
"ASSIGNMENT.\n");
gprs_rlcmac_diag(tbf);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
}
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
debug_diagram(tbf->diag, "timeout UL-ASS");
tbf->n3105++;
if (tbf->n3105 == bts->n3105) {
LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
debug_diagram(tbf->diag, "N3105 exceeded");
tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
tbf_timer_start(tbf, 3195, bts->t3195, 0);
return 0;
}
/* reschedule UL assignment */
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
} else
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
"PACKET CONTROL ACK for PACKET DOWNLINK "
"ASSIGNMENT.\n");
gprs_rlcmac_diag(tbf);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
}
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
debug_diagram(tbf->diag, "timeout DL-ASS");
tbf->n3105++;
if (tbf->n3105 == bts->n3105) {
LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
debug_diagram(tbf->diag, "N3105 exceeded");
tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
tbf_timer_start(tbf, 3195, bts->t3195, 0);
return 0;
}
/* reschedule DL assignment */
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
} else
if (tbf->direction == GPRS_RLCMAC_DL_TBF) {
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
"PACKET DOWNLINK ACK.\n");
gprs_rlcmac_diag(tbf);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
}
debug_diagram(tbf->diag, "timeout DL-ACK");
tbf->n3105++;
if (tbf->n3105 == bts->n3105) {
LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
debug_diagram(tbf->diag, "N3105 exceeded");
tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
tbf_timer_start(tbf, 3195, bts->t3195, 0);
return 0;
}
/* resend IMM.ASS on CCCH on timeout */
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))
&& !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) {
LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment "
"for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi,
tbf->dir.dl.imsi);
/* send immediate assignment */
gprs_rlcmac_downlink_assignment(tbf, 0, tbf->dir.dl.imsi);
tbf->dir.dl.wait_confirm = 1;
}
} else
LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n");
return 0;
}
static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap)
{
int i;
for (i = 0; i < cap->Count_MS_RA_capability_value; i++) {
if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability)
continue;
if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class)
continue;
return cap->MS_RA_capability_value[i].u.Content.Multislot_capability.GPRS_multislot_class;
}
return 0;
}
static struct gprs_rlcmac_tbf *alloc_ul_tbf(int8_t use_trx, uint8_t ms_class,
uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf)
{
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
uint8_t trx;
struct gprs_rlcmac_tbf *tbf;
uint8_t tfi;
/* create new TBF, use sme TRX as DL TBF */
tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, use_trx);
if (tfi < 0) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
/* use multislot class of downlink TBF */
tbf = tbf_alloc(dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return NULL;
}
tbf->tlli = tlli;
tbf->tlli_valid = 1; /* no contention resolution */
tbf->dir.ul.contention_resolution_done = 1;
tbf->ta = ta; /* use current TA */
tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
tbf_timer_start(tbf, 3169, bts->t3169, 0);
return tbf;
}
/* Received Uplink RLC control block. */
int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts,
uint32_t fn)
{
int8_t tfi = 0; /* must be signed */
uint32_t tlli = 0;
struct gprs_rlcmac_tbf *tbf;
int rc;
RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
switch (ul_control_block->u.MESSAGE_TYPE) {
case MT_PACKET_CONTROL_ACK:
tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI;
tbf = tbf_by_poll_fn(fn, trx, ts);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
"unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n",
fn, tlli, trx, ts);
break;
}
tfi = tbf->tfi;
if (tlli != tbf->tlli) {
LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to "
"0x%08x\n", tlli);
tbf->tlli = tlli;
}
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
/* check if this control ack belongs to packet uplink ack */
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
debug_diagram(tbf->diag, "got CTL-ACK (fin)");
if ((tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
"ack for UL TBF=%d\n", tbf->tfi);
}
tbf_free(tbf);
break;
}
if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
/* reset N3105 */
tbf->n3105 = 0;
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
debug_diagram(tbf->diag, "got CTL-ACK DL-ASS");
if (tbf->direction == GPRS_RLCMAC_UL_TBF)
tbf = tbf_by_tlli(tbf->tlli,
GPRS_RLCMAC_DL_TBF);
if (!tbf) {
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL "
"TBF is gone\n");
break;
}
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
/* stop pending assignment timer */
tbf_timer_stop(tbf);
if ((tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink "
"assignment for DL TBF=%d\n", tbf->tfi);
}
tbf_assign_control_ts(tbf);
break;
}
if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
/* reset N3105 */
tbf->n3105 = 0;
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
debug_diagram(tbf->diag, "got CTL-AC UL-ASS");
if (tbf->direction == GPRS_RLCMAC_DL_TBF)
tbf = tbf_by_tlli(tbf->tlli,
GPRS_RLCMAC_UL_TBF);
if (!tbf) {
LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL "
"TBF is gone\n");
break;
}
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
if ((tbf->state_flags &
(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
tbf->state_flags &=
~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
"assignment for UL TBF=%d\n", tbf->tfi);
}
tbf_assign_control_ts(tbf);
break;
}
LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
"at no request\n");
break;
case MT_PACKET_DOWNLINK_ACK_NACK:
tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
tbf = tbf_by_poll_fn(fn, trx, ts);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
fn, tfi, trx, ts);
break;
}
if (tbf->tfi != tfi) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
"wrong TFI=%d, ignoring!\n", tfi);
break;
}
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack "
"for DL TBF=%d\n", tbf->tfi);
}
/* reset N3105 */
tbf->n3105 = 0;
/* stop timer T3191 */
tbf_timer_stop(tbf);
tlli = tbf->tlli;
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
debug_diagram(tbf->diag, "got DL-ACK");
rc = gprs_rlcmac_downlink_ack(tbf,
ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION,
ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP);
if (rc == 1) {
tbf_free(tbf);
break;
}
/* check for channel request */
if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) {
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
"message, so we provide one:\n");
alloc_ul_tbf(tbf->trx, tbf->ms_class, tbf->tlli, tbf->ta, tbf);
/* schedule uplink assignment */
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
}
break;
case MT_PACKET_RESOURCE_REQUEST:
if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) {
tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI;
tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
if (tbf) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while UL TBF=%d still "
"exists. Killing pending DL TBF\n",
tlli, tbf->tfi);
tbf_free(tbf);
tbf = NULL;
}
if (!tbf) {
uint8_t ms_class = 0;
struct gprs_rlcmac_tbf *dl_tbf;
if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while DL TBF=%d still exists. "
"Killing pending DL TBF\n", tlli,
dl_tbf->tfi);
tbf_free(dl_tbf);
}
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF "
"in packet ressource request of single "
"block, so we provide one:\n");
if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability)
ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability);
if (!ms_class)
LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n");
tbf = alloc_ul_tbf(trx, ms_class, tlli, 0, NULL);
#warning FIXME TA!!!
if (!tbf)
break;
/* set control ts to current MS's TS, until assignment complete */
LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts);
tbf->control_ts = ts;
/* schedule uplink assignment */
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
debug_diagram(tbf->diag, "Res. REQ");
break;
}
tfi = tbf->tfi;
} else {
if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) {
tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI;
tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_DL_TBF);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli);
break;
}
} else {
tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI;
tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_UL_TBF);
if (!tbf) {
LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli);
break;
}
}
tlli = tbf->tlli;
}
LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli);
break;
case MT_PACKET_MEASUREMENT_REPORT:
gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report);
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n");
}
talloc_free(ul_control_block);
return 1;
}
#ifdef DEBUG_DL_ASS_IDLE
char debug_imsi[16];
#endif
void tbf_timer_cb(void *_tbf)
{
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n",
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi,
tbf->T);
tbf->num_T_exp++;
switch (tbf->T) {
#ifdef DEBUG_DL_ASS_IDLE
case 1234:
gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi);
break;
#endif
case 0: /* assignment */
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) {
if (tbf->state == GPRS_RLCMAC_ASSIGN) {
LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to "
"PACCH assignment timeout.\n");
tbf_free(tbf);
} else
LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not "
"in assign state\n");
}
if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) {
/* change state to FLOW, so scheduler will start transmission */
tbf->dir.dl.wait_confirm = 0;
if (tbf->state == GPRS_RLCMAC_ASSIGN) {
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
tbf_assign_control_ts(tbf);
} else
LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after "
"IMM.ASS confirm\n");
}
break;
case 3169:
case 3191:
case 3195:
LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during "
"transsmission\n", tbf->T);
gprs_rlcmac_diag(tbf);
/* fall through */
case 3193:
if (tbf->T == 3193)
debug_diagram(tbf->diag, "T3193 timeout");
LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n");
/* free TBF */
tbf_free(tbf);
break;
default:
LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n",
tbf->T);
}
}
/*
* UL data block flow
*/
/* get TLLI from received UL data block */
static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli)
{
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
struct rlc_li_field *li;
uint8_t e;
uint32_t _tlli;
if (!rh->ti)
return -EINVAL;
data += 3;
len -= 3;
e = rh->e;
/* if E is not set (LI follows) */
while (!e) {
if (!len) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, "
"but no more data\n");
return -EINVAL;
}
/* get new E */
li = (struct rlc_li_field *)data;
if (li->e == 0) /* if LI==0, E is interpreted as '1' */
e = 1;
else
e = li->e;
data++;
len--;
}
if (len < 4) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame "
"border\n");
return -EINVAL;
}
memcpy(&_tlli, data, 4);
*tlli = ntohl(_tlli);
return 0;
}
/* Store received block data in LLC message(s) and forward to SGSN if complete.
*/
static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data,
uint8_t len)
{
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
uint8_t e, m;
struct rlc_li_field *li;
uint8_t frame_offset[16], offset = 0, chunk;
int i, frames = 0;
LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len);
data += 3;
len -= 3;
e = rh->e; /* if extended */
m = 1; /* more frames, that means: the first frame */
/* Parse frame offsets from length indicator(s), if any. */
while (1) {
if (frames == (int)sizeof(frame_offset)) {
LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in "
"block\n");
return -EINVAL;
}
frame_offset[frames++] = offset;
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset "
"%d\n", frames, offset);
if (!len)
break;
/* M == 0 and E == 0 is not allowed in this version. */
if (!m && !e) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d "
"ignored, because M='0' and E='0'.\n",
tbf->tfi);
return 0;
}
/* no more frames in this segment */
if (e) {
break;
}
/* There is a new frame and an LI that delimits it. */
if (m) {
li = (struct rlc_li_field *)data;
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n",
li->li);
/* Special case: LI == 0
* If the last segment would fit precisely into the
* rest of the RLC MAC block, there would be no way
* to delimit that this segment ends and is not
* continued in the next block.
* The special LI (0) is used to force the segment to
* extend into the next block, so it is delimited there.
* This LI must be skipped. Also it is the last LI.
*/
if (li->li == 0) {
data++;
len--;
m = 1; /* M is ignored, we know there is more */
break; /* handle E as '1', so we break! */
}
e = li->e;
m = li->m;
offset += li->li;
data++;
len--;
continue;
}
}
if (!m) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare "
"data\n");
}
LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n",
len);
/* TLLI */
if (rh->ti) {
if (len < 4) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of "
"frame border\n");
return -EINVAL;
}
data += 4;
len -= 4;
LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: "
"%d\n", len);
}
/* PFI */
if (rh->pi) {
LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, "
"please disable in SYSTEM INFORMATION\n");
if (len < 1) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of "
"frame border\n");
return -EINVAL;
}
data++;
len--;
LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: "
"%d\n", len);
}
/* Now we have:
* - a list of frames offsets: frame_offset[]
* - number of frames: i
* - m == 0: Last frame carries spare data (end of TBF).
*/
/* Check if last offset would exceed frame. */
if (offset > len) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, "
"because LI delimits data that exceeds block size.\n",
tbf->tfi);
return -EINVAL;
}
/* create LLC frames */
for (i = 0; i < frames; i++) {
/* last frame ? */
if (i == frames - 1) {
/* no more data in last frame */
if (!m)
break;
/* data until end of frame */
chunk = len - frame_offset[i];
} else {
/* data until next frame */
chunk = frame_offset[i + 1] - frame_offset[i];
}
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to "
"frame at %d.\n", chunk, tbf->llc_index);
if (tbf->llc_index + chunk > LLC_MAX_LEN) {
LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds "
"maximum size.\n");
chunk = LLC_MAX_LEN - tbf->llc_index;
}
memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i],
chunk);
tbf->llc_index += chunk;
/* not last frame. */
if (i != frames - 1) {
/* send frame to SGSN */
LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
"TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index);
gprs_rlcmac_tx_ul_ud(tbf);
tbf->llc_index = 0; /* reset frame space */
/* also check if CV==0, because the frame may fill up the
* block precisely, then it is also complete. normally the
* frame would be extended into the next block with a 0-length
* delimiter added to this block. */
} else if (rh->cv == 0) {
/* send frame to SGSN */
LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
"TBF=%d that fits precisely in last block: "
"len=%d\n", tbf->tfi, tbf->llc_index);
gprs_rlcmac_tx_ul_ud(tbf);
tbf->llc_index = 0; /* reset frame space */
}
}
return 0;
}
struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf,
uint32_t fn)
{
int final = (tbf->state == GPRS_RLCMAC_FINISHED);
struct msgb *msg;
if (final) {
if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
"sheduled for TBF=%d, so we must wait for "
"final uplink ack...\n", tbf->tfi);
return NULL;
}
if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) {
LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
"scheduled for single block allocation...\n");
return NULL;
}
}
msg = msgb_alloc(23, "rlcmac_ul_ack");
if (!msg)
return NULL;
bitvec *ack_vec = bitvec_alloc(23);
if (!ack_vec) {
msgb_free(msg);
return NULL;
}
bitvec_unhex(ack_vec,
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
write_packet_uplink_ack(mac_control_block, tbf, final);
encode_gsm_rlcmac_downlink(ack_vec, mac_control_block);
bitvec_pack(ack_vec, msgb_put(msg, 23));
bitvec_free(ack_vec);
talloc_free(mac_control_block);
/* now we must set this flag, so we are allowed to assign downlink
* TBF on PACCH. it is only allowed when TLLI is aknowledged. */
tbf->dir.ul.contention_resolution_done = 1;
if (final) {
tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
tbf->poll_fn = (fn + 13) % 2715648;
/* waiting for final acknowledge */
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK;
tbf->dir.ul.final_ack_sent = 1;
} else
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
debug_diagram(tbf->diag, "send UL-ACK");
return msg;
}
/* receive UL data block
*
* The blocks are defragmented and forwarded as LLC frames, if complete.
*/
int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts,
uint8_t *data, uint8_t len, int8_t rssi)
{
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
struct gprs_rlcmac_tbf *tbf;
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index;
int rc;
switch (len) {
case 54:
/* omitting spare bits */
len = 53;
break;
case 40:
/* omitting spare bits */
len = 39;
break;
case 34:
/* omitting spare bits */
len = 33;
break;
case 23:
break;
default:
LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
"length: %d)\n", len);
return -EINVAL;
}
/* find TBF inst from given TFI */
tbf = tbf_by_tfi(rh->tfi, trx, GPRS_RLCMAC_UL_TBF);
if (!tbf) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n",
rh->tfi);
return 0;
}
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA);
LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. "
"V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r);
/* process RSSI */
gprs_rlcmac_rssi(tbf, rssi);
/* get TLLI */
if (!tbf->tlli_valid) {
struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf;
/* no TLLI yet */
if (!rh->ti) {
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without "
"TLLI, but no TLLI received yet\n", rh->tfi);
return 0;
}
rc = tlli_from_ul_data(data, len, &tbf->tlli);
if (rc) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
"of UL DATA TBF=%d.\n", rh->tfi);
return 0;
}
LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of "
"UL DATA TBF=%d.\n", tbf->tlli, rh->tfi);
if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while DL TBF=%d still exists. "
"Killing pending DL TBF\n", tbf->tlli,
dl_tbf->tfi);
tbf_free(dl_tbf);
}
/* tbf_by_tlli will not find your TLLI, because it is not
* yet marked valid */
if ((ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
"TLLI=0x%08x while UL TBF=%d still exists. "
"Killing pending UL TBF\n", tbf->tlli,
ul_tbf->tfi);
tbf_free(ul_tbf);
}
/* mark TLLI valid now */
tbf->tlli_valid = 1;
/* already have TLLI, but we stille get another one */
} else if (rh->ti) {
uint32_t tlli;
rc = tlli_from_ul_data(data, len, &tlli);
if (rc) {
LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
"of UL DATA TBF=%d.\n", rh->tfi);
return 0;
}
if (tlli != tbf->tlli) {
LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL "
"DATA TBF=%d. (Ignoring due to contention "
"resolution)\n", rh->tfi);
return 0;
}
}
mod_sns = tbf->sns - 1;
mod_sns_half = (tbf->sns >> 1) - 1;
/* restart T3169 */
tbf_timer_start(tbf, 3169, bts->t3169, 0);
/* Increment RX-counter */
tbf->dir.ul.rx_counter++;
/* current block relative to lowest unreceived block */
offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns;
/* If out of window (may happen if blocks below V(Q) are received
* again. */
if (offset_v_q >= tbf->ws) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window "
"%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q,
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
return 0;
}
/* Write block to buffer and set receive state array. */
index = rh->bsn & mod_sns_half; /* memory index of block */
memcpy(tbf->rlc_block[index], data, len); /* Copy block. */
tbf->rlc_block_len[index] = len;
tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */
LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n",
rh->bsn, tbf->dir.ul.v_q,
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
/* Raise V(R) to highest received sequence number not received. */
offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns;
if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */
while (offset_v_r--) {
if (offset_v_r) /* all except the received block */
tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half]
= 'N'; /* Mark block as not received */
tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns;
/* Inc V(R). */
}
LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n",
tbf->dir.ul.v_r);
}
/* Raise V(Q) if possible, and retrieve LLC frames from blocks.
* This is looped until there is a gap (non received block) or
* the window is empty.*/
while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[
(index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising "
"V(Q) to %d\n", tbf->dir.ul.v_q,
(tbf->dir.ul.v_q + 1) & mod_sns);
/* get LLC data from block */
gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index],
tbf->rlc_block_len[index]);
/* raise V(Q), because block already received */
tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns;
}
/* Check CV of last frame in buffer */
if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */
&& tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */
struct rlc_ul_header *last_rh = (struct rlc_ul_header *)
tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half];
LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, "
"last block: BSN=%d CV=%d\n", last_rh->bsn,
last_rh->cv);
if (last_rh->cv == 0) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL "
"TBF\n");
tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
/* Reset N3103 counter. */
tbf->dir.ul.n3103 = 0;
}
}
/* If TLLI is included or if we received half of the window, we send
* an ack/nack */
if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED
|| (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) {
if (rh->si) {
LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, "
"because MS is stalled.\n");
}
if (rh->ti) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
"because TLLI is included.\n");
}
if (tbf->state == GPRS_RLCMAC_FINISHED) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
"because last block has CV==0.\n");
}
if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) {
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
"because %d frames received.\n",
SEND_ACK_AFTER_FRAMES);