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osmo-pcu/src/gprs_rlcmac_ctrl.cpp

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/* gprs_rlcmac_ctrl.cpp
*
* 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 <errno.h>
#include <arpa/inet.h>
#include "bitvector.h"
#include "gsm_rlcmac.h"
extern "C" {
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include "gprs_debug.h"
#include "gprs_rlcmac.h"
}
#include "gprs_rlcmac_ctrl.h"
extern void *tall_pcu_ctx;
// GSM 04.08 9.1.18 Immediate assignment
static uint8_t write_immediate_assignment(bitvec * dest, uint8_t downlink,
uint8_t ra, uint32_t fn, uint8_t ta, uint16_t arfcn, uint8_t ts,
uint8_t tsc, uint8_t tfi, uint8_t usf, uint32_t tlli, uint8_t polling,
uint32_t poll_fn)
{
unsigned wp = 0;
uint8_t plen;
bitvec_write_field(dest, wp,0x0,4); // Skip Indicator
bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator
bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type
// 10.5.2.25b Dedicated mode or TBF
bitvec_write_field(dest, wp,0x0,1); // spare
bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning
bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode
bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF).
bitvec_write_field(dest, wp,0x0,4); // Page Mode
// GSM 04.08 10.5.2.25a Packet Channel Description
bitvec_write_field(dest, wp,0x1,5); // Channel type
bitvec_write_field(dest, wp,ts,3); // TN
bitvec_write_field(dest, wp,tsc,3); // TSC
bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion
bitvec_write_field(dest, wp,arfcn,10); // ARFCN
//10.5.2.30 Request Reference
bitvec_write_field(dest, wp,ra,8); // RA
bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1'
bitvec_write_field(dest, wp,fn % 51,6); // T3
bitvec_write_field(dest, wp,fn % 26,5); // T2
// 10.5.2.40 Timing Advance
bitvec_write_field(dest, wp,0x0,2); // spare
bitvec_write_field(dest, wp,ta,6); // Timing Advance value
// No mobile allocation in non-hopping systems.
// A zero-length LV. Just write L=0.
bitvec_write_field(dest, wp,0,8);
if ((wp % 8)) {
LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest "
"octets is not multiple of 8 bits, PLEASE FIX!\n");
exit (0);
}
plen = wp / 8;
if (downlink)
{
// GSM 04.08 10.5.2.16 IA Rest Octets
bitvec_write_field(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment
bitvec_write_field(dest, wp,tlli,32); // TLLI
bitvec_write_field(dest, wp,0x1,1); // switch TFI : on
bitvec_write_field(dest, wp,tfi,5); // TFI
bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode
bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present
bitvec_write_field(dest, wp,0x0,5); // GAMMA power control parameter
bitvec_write_field(dest, wp,polling,1); // Polling Bit
bitvec_write_field(dest, wp,!polling,1); // TA_VALID ???
bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
bitvec_write_field(dest, wp,0x0,4); // TIMING_ADVANCE_INDEX
if (polling) {
bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present
bitvec_write_field(dest, wp,(poll_fn / (26 * 51)) % 32,5); // T1'
bitvec_write_field(dest, wp,poll_fn % 51,6); // T3
bitvec_write_field(dest, wp,poll_fn % 26,5); // T2
} else {
bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present
}
bitvec_write_field(dest, wp,0x0,1); // P0 not present
// bitvec_write_field(dest, wp,0x1,1); // P0 not present
// bitvec_write_field(dest, wp,0xb,4);
}
else
{
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
// GMS 04.08 10.5.2.37b 10.5.2.16
bitvec_write_field(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment
bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation
bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity
bitvec_write_field(dest, wp, 0, 1); // POLLING
bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic
bitvec_write_field(dest, wp, usf, 3); // USF
bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY
bitvec_write_field(dest, wp, 0 , 1); // "0" power control: Not Present
bitvec_write_field(dest, wp, bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND
bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING
bitvec_write_field(dest, wp, 1 , 1); // "1" Alpha : Present
bitvec_write_field(dest, wp, 0, 4); // Alpha
bitvec_write_field(dest, wp, 0, 5); // Gamma
bitvec_write_field(dest, wp, 0, 1); // TIMING_ADVANCE_INDEX_FLAG
bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG
}
return plen;
}
extern "C"
int write_immediate_assignment_uplink(uint8_t *data, uint8_t ra, uint32_t fn,
uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi,
uint8_t usf, uint8_t polling, uint32_t poll_fn)
{
bitvec *ass_vec;
uint8_t plen;
ass_vec = bitvec_alloc(22); /* without plen */
if (!ass_vec)
return -ENOMEM;
bitvec_unhex(ass_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
plen = write_immediate_assignment(ass_vec, 0, ra, fn, ta, arfcn,
ts, tsc, tfi, usf, 0, polling, poll_fn);
bitvec_pack(ass_vec, data + 1);
data[0] = (plen << 2) | 0x01;
bitvec_free(ass_vec);
return 0;
}
extern "C"
int write_immediate_assignment_downlink(uint8_t *data, uint8_t ra, uint32_t fn,
uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi,
uint32_t tlli, uint8_t polling, uint32_t poll_fn)
{
bitvec *ass_vec;
uint8_t plen;
ass_vec = bitvec_alloc(22); /* without plen */
if (!ass_vec)
return -ENOMEM;
bitvec_unhex(ass_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
plen = write_immediate_assignment(ass_vec, 1, ra, fn, ta, arfcn,
ts, tsc, tfi, 0, tlli, polling, poll_fn);
bitvec_pack(ass_vec, data + 1);
data[0] = (plen << 2) | 0x01;
bitvec_free(ass_vec);
return 0;
}
/* generate uplink assignment */
extern "C"
struct msgb *write_packet_uplink_assignment(uint8_t old_tfi,
uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli,
struct gprs_rlcmac_tbf *tbf, uint8_t poll)
{
// TODO We should use our implementation of encode RLC/MAC Control messages.
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
unsigned wp = 0;
uint8_t ts;
struct msgb *msg;
bitvec *ass_vec;
RlcMacDownlink_t *block;
msg = msgb_alloc(23, "rlcmac_ul_ass");
if (!msg)
return NULL;
ass_vec = bitvec_alloc(23);
if (!ass_vec) {
msgb_free(msg);
return NULL;
}
bitvec_unhex(ass_vec,
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
if (!block) {
bitvec_free(ass_vec);
msgb_free(msg);
return NULL;
}
bitvec_write_field(ass_vec, wp,0x1,2); // Payload Type
bitvec_write_field(ass_vec, wp,0x0,2); // Uplink block with TDMA framenumber (N+13)
bitvec_write_field(ass_vec, wp,poll,1); // Suppl/Polling Bit
bitvec_write_field(ass_vec, wp,0x0,3); // Uplink state flag
bitvec_write_field(ass_vec, wp,0xa,6); // MESSAGE TYPE
bitvec_write_field(ass_vec, wp,0x0,2); // Page Mode
bitvec_write_field(ass_vec, wp,0x0,1); // switch PERSIST_LEVEL: off
if (use_tlli) {
bitvec_write_field(ass_vec, wp,0x2,2); // switch TLLI : on
bitvec_write_field(ass_vec, wp,tlli,32); // TLLI
} else {
bitvec_write_field(ass_vec, wp,0x0,1); // switch TFI : on
bitvec_write_field(ass_vec, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI
bitvec_write_field(ass_vec, wp,old_tfi,5); // TFI
}
bitvec_write_field(ass_vec, wp,0x0,1); // Message escape
bitvec_write_field(ass_vec, wp,bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND
bitvec_write_field(ass_vec, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING
bitvec_write_field(ass_vec, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on
bitvec_write_field(ass_vec, wp,tbf->ta,6); // TIMING_ADVANCE_VALUE
bitvec_write_field(ass_vec, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off
#if 1
bitvec_write_field(ass_vec, wp,0x1,1); // Frequency Parameters information elements = present
bitvec_write_field(ass_vec, wp,tbf->tsc,3); // Training Sequence Code (TSC)
bitvec_write_field(ass_vec, wp,0x0,2); // ARFCN = present
bitvec_write_field(ass_vec, wp,tbf->arfcn,10); // ARFCN
#else
bitvec_write_field(ass_vec, wp,0x0,1); // Frequency Parameters = off
#endif
bitvec_write_field(ass_vec, wp,0x1,2); // Dynamic Allocation
bitvec_write_field(ass_vec, wp,0x0,1); // Extended Dynamic Allocation = off
bitvec_write_field(ass_vec, wp,0x0,1); // P0 = off
bitvec_write_field(ass_vec, wp,0x0,1); // USF_GRANULARITY
bitvec_write_field(ass_vec, wp,0x1,1); // switch TFI : on
bitvec_write_field(ass_vec, wp,tbf->tfi,5);// TFI
bitvec_write_field(ass_vec, wp,0x0,1); //
bitvec_write_field(ass_vec, wp,0x0,1); // TBF Starting Time = off
bitvec_write_field(ass_vec, wp,0x0,1); // Timeslot Allocation
for (ts = 0; ts < 8; ts++) {
if (tbf->pdch[ts]) {
bitvec_write_field(ass_vec, wp,0x1,1); // USF_TN(i): on
bitvec_write_field(ass_vec, wp,tbf->dir.ul.usf[ts],3); // USF_TN(i)
} else
bitvec_write_field(ass_vec, wp,0x0,1); // USF_TN(i): off
}
// bitvec_write_field(ass_vec, wp,0x0,1); // Measurement Mapping struct not present
bitvec_pack(ass_vec, msgb_put(msg, 23));
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_downlink(ass_vec, block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n");
bitvec_free(ass_vec);
talloc_free(block);
return msg;
}
/* generate downlink assignment */
extern "C"
struct msgb *write_packet_downlink_assignment(uint8_t old_tfi,
uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, uint8_t poll)
{
// Packet downlink assignment TS 44.060 11.2.7
uint8_t tn;
struct msgb *msg;
bitvec *ass_vec;
RlcMacDownlink_t *block;
msg = msgb_alloc(23, "rlcmac_dl_ass");
if (!msg)
return NULL;
ass_vec = bitvec_alloc(23);
if (!ass_vec) {
msgb_free(msg);
return NULL;
}
bitvec_unhex(ass_vec,
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
if (!block) {
bitvec_free(ass_vec);
msgb_free(msg);
return NULL;
}
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
block->RRBP = 0x0; // N+13
block->SP = poll; // RRBP field is valid
block->USF = 0x0; // Uplink state flag
block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment
block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging
block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off
block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on
block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI
block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI
block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation
block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode
block->u.Packet_Downlink_Assignment.CONTROL_ACK = old_downlink; // NW establishes no new DL TBF for the MS with running timer T3192
block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s)
for (tn = 0; tn < 8; tn++) {
if (tbf->pdch[tn])
block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s)
}
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta; // TIMING_ADVANCE_VALUE
block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off
block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off
block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on
block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tbf->tsc; // Training Sequence Code (TSC)
block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on
block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = tbf->arfcn; // ARFCN
block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on
block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tbf->tfi; // TFI
block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = 0x0; // ALPHA
for (tn = 0; tn < 8; tn++)
{
if (tbf->pdch[tn])
{
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = 0x0; // GAMMA_TN
}
else
{
block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off
}
}
block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off
block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off
block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
encode_gsm_rlcmac_downlink(ass_vec, block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
bitvec_pack(ass_vec, msgb_put(msg, 23));
bitvec_free(ass_vec);
talloc_free(block);
return msg;
}
/* generate uplink ack */
extern "C"
struct msgb *write_packet_uplink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final)
{
// Packet Uplink Ack/Nack TS 44.060 11.2.28
char show_v_n[65];
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
uint8_t rbb = 0;
uint16_t i, bbn;
uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
char bit;
struct msgb *msg;
bitvec *ack_vec;
RlcMacDownlink_t *block;
LOGP(DRLCMACUL, LOGL_DEBUG, "Sending Ack/Nack for TBF=%d "
"(final=%d)\n", tbf->tfi, final);
msg = msgb_alloc(23, "rlcmac_ul_ack");
if (!msg)
return NULL;
ack_vec = bitvec_alloc(23);
if (!ack_vec) {
msgb_free(msg);
return NULL;
}
bitvec_unhex(ack_vec,
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
if (!block) {
bitvec_free(ack_vec);
msgb_free(msg);
return NULL;
}
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
block->RRBP = 0x0; // N+13
block->SP = final; // RRBP field is valid, if it is final ack
block->USF = 0x0; // Uplink state flag
block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment
block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging
block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tbf->tfi; // Uplink TFI
block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = bts->initial_cs - 1; // CS1
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = final; // FINAL ACK INDICATION
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = tbf->dir.ul.v_r; // STARTING_SEQUENCE_NUMBER
// RECEIVE_BLOCK_BITMAP
for (i = 0, bbn = (tbf->dir.ul.v_r - 64) & mod_sns_half; i < 64;
i++, bbn = (bbn + 1) & mod_sns_half) {
bit = tbf->dir.ul.v_n[bbn];
if (bit == 0)
bit = ' ';
show_v_n[i] = bit;
if (bit == 'R')
rbb = (rbb << 1)|1;
else
rbb = (rbb << 1);
if((i%8) == 7)
{
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i/8] = rbb;
rbb = 0;
}
}
show_v_n[64] = '\0';
LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received "
"N=Not-Received\n", show_v_n);
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tbf->tlli;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0;
block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0;
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Ack/Nack +++++++++++++++++++++++++\n");
encode_gsm_rlcmac_downlink(ack_vec, block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Ack/Nack +++++++++++++++++++++++++\n");
bitvec_pack(ack_vec, msgb_put(msg, 23));
bitvec_free(ack_vec);
talloc_free(block);
return msg;
}
static unsigned write_packet_paging_request(bitvec * dest)
{
unsigned wp = 0;
bitvec_write_field(dest, wp,0x1,2); // Payload Type
bitvec_write_field(dest, wp,0x0,3); // No polling
bitvec_write_field(dest, wp,0x0,3); // Uplink state flag
bitvec_write_field(dest, wp,0x22,6); // MESSAGE TYPE
bitvec_write_field(dest, wp,0x0,2); // Page Mode
bitvec_write_field(dest, wp,0x0,1); // No PERSISTENCE_LEVEL
bitvec_write_field(dest, wp,0x0,1); // No NLN
return wp;
}
static unsigned write_repeated_page_info(bitvec * dest, unsigned& wp,
uint8_t len, uint8_t *identity, uint8_t chan_needed)
{
bitvec_write_field(dest, wp,0x1,1); // Repeated Page info exists
bitvec_write_field(dest, wp,0x1,1); // RR connection paging
if ((identity[0] & 0x07) == 4) {
bitvec_write_field(dest, wp,0x0,1); // TMSI
identity++;
len--;
} else {
bitvec_write_field(dest, wp,0x0,1); // MI
bitvec_write_field(dest, wp,len,4); // MI len
}
while (len) {
bitvec_write_field(dest, wp,*identity++,8); // MI data
len--;
}
bitvec_write_field(dest, wp,chan_needed,2); // CHANNEL_NEEDED
bitvec_write_field(dest, wp,0x0,1); // No eMLPP_PRIORITY
return wp;
}
extern "C"
struct msgb *gprs_rlcmac_send_packet_paging_request(
struct gprs_rlcmac_pdch *pdch)
{
struct gprs_rlcmac_paging *pag;
struct msgb *msg;
unsigned wp = 0, len;
/* no paging, no message */
pag = gprs_rlcmac_dequeue_paging(pdch);
if (!pag)
return NULL;
LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n");
/* alloc message */
msg = msgb_alloc(23, "pag ctrl block");
if (!msg)
return NULL;
bitvec *pag_vec = bitvec_alloc(23);
if (!pag_vec) {
msgb_free(msg);
return NULL;
}
wp = write_packet_paging_request(pag_vec);
/* loop until message is full */
while (pag) {
/* try to add paging */
if ((pag->identity_lv[1] & 0x07) == 4) {
/* TMSI */
LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n",
ntohl(*((uint32_t *)(pag->identity_lv + 1))));
len = 1 + 1 + 1 + 32 + 2 + 1;
if (pag->identity_lv[0] != 5) {
LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with "
"MI != 5 octets!\n");
break;
}
} else {
/* MI */
LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n",
osmo_hexdump(pag->identity_lv + 1,
pag->identity_lv[0]));
len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1;
if (pag->identity_lv[0] > 8) {
LOGP(DRLCMAC, LOGL_ERROR, "Paging with "
"MI > 8 octets!\n");
break;
}
}
if (wp + len > 184) {
LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule "
"next time\n");
/* put back paging record, because does not fit */
llist_add_tail(&pag->list, &pdch->paging_list);
break;
}
write_repeated_page_info(pag_vec, wp, pag->identity_lv[0],
pag->identity_lv + 1, pag->chan_needed);
pag = gprs_rlcmac_dequeue_paging(pdch);
}
bitvec_pack(pag_vec, msgb_put(msg, 23));
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_downlink(pag_vec, mac_control_block);
LOGPC(DCSN1, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n");
bitvec_free(pag_vec);
talloc_free(mac_control_block);
return msg;
}
/* Received Uplink RLC control block. */
extern "C"
int gprs_rlcmac_rcv_control_block(uint8_t trx, uint8_t ts, uint32_t fn,
uint8_t *data, uint8_t len)
{
uint32_t tlli = 0;
int8_t tfi = 0; /* must be signed */
struct gprs_rlcmac_tbf *tbf;
bitvec *block;
RlcMacUplink_t * ul_control_block;
block = bitvec_alloc(len);
if (!block)
return -ENOMEM;
bitvec_unpack(block, data);
ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
if (!ul_control_block) {
bitvec_free(block);
return -ENOMEM;
}
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_uplink(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;
gprs_rlcmac_rcv_control_ack(trx, ts, fn, tlli);
break;
case MT_PACKET_DOWNLINK_ACK_NACK:
tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
gprs_rlcmac_rcv_downlink_ack(trx, ts, fn, tfi,
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,
ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description);
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(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli);
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, ts, 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, ts, 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;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n");
}
talloc_free(ul_control_block);
bitvec_free(block);
return 1;
}
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