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/* pcu_l1_if.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
*
* 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 <Sockets.h>
#include <gsmtap.h>
#include <gprs_rlcmac.h>
#include <Threads.h>
#include <pcu_l1_if.h>
#define MAX_UDP_LENGTH 1500
// TODO: We should take ports and IP from config.
UDPSocket pcu_gsmtap_socket(5077, "127.0.0.1", 4729);
// Variable for storage current FN.
int frame_number;
int get_current_fn()
{
return frame_number;
}
void set_current_fn(int fn)
{
frame_number = fn;
}
struct msgb *l1p_msgb_alloc(void)
{
struct msgb *msg = msgb_alloc(sizeof(GsmL1_Prim_t), "l1_prim");
if (msg)
msg->l1h = msgb_put(msg, sizeof(GsmL1_Prim_t));
return msg;
}
struct msgb *gen_dummy_msg(void)
{
struct msgb *msg = l1p_msgb_alloc();
GsmL1_Prim_t *prim = msgb_l1prim(msg);
// RLC/MAC filler with USF=1
bitvec *filler = bitvec_alloc(23);
bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
prim->id = GsmL1_PrimId_PhDataReq;
prim->u.phDataReq.sapi = GsmL1_Sapi_Pacch;
bitvec_pack(filler, prim->u.phDataReq.msgUnitParam.u8Buffer);
prim->u.phDataReq.msgUnitParam.u8Size = filler->data_len;
bitvec_free(filler);
return msg;
}
// Send RLC/MAC block to OpenBTS.
void pcu_l1if_tx(bitvec * block, GsmL1_Sapi_t sapi, int len)
{
struct msgb *msg = l1p_msgb_alloc();
struct osmo_wqueue * queue;
queue = &((l1fh->fl1h)->write_q);
GsmL1_Prim_t *prim = msgb_l1prim(msg);
prim->id = GsmL1_PrimId_PhDataReq;
prim->u.phDataReq.sapi = sapi;
bitvec_pack(block, prim->u.phDataReq.msgUnitParam.u8Buffer);
prim->u.phDataReq.msgUnitParam.u8Size = len;
//COUT("Add Block to WRITE QUEUE: " << *block);
osmo_wqueue_enqueue(queue, msg);
}
int pcu_l1if_rx_pdch(GsmL1_PhDataInd_t *data_ind)
{
bitvec *block = bitvec_alloc(data_ind->msgUnitParam.u8Size);
bitvec_unpack(block, data_ind->msgUnitParam.u8Buffer);
//COUT("RX: " << *block);
gprs_rlcmac_rcv_block(block);
bitvec_free(block);
}
static int handle_ph_connect_ind(struct femtol1_hdl *fl1, GsmL1_PhConnectInd_t *connect_ind)
{
(l1fh->fl1h)->channel_info.arfcn = connect_ind->u16Arfcn;
(l1fh->fl1h)->channel_info.tn = connect_ind->u8Tn;
(l1fh->fl1h)->channel_info.tsc = connect_ind->u8Tsc;
COUT("RX: [ PCU <- BTS ] PhConnectInd: ARFCN: " << connect_ind->u16Arfcn
<<" TN: " << (unsigned)connect_ind->u8Tn << " TSC: " << (unsigned)connect_ind->u8Tsc);
}
static int handle_ph_readytosend_ind(struct femtol1_hdl *fl1, GsmL1_PhReadyToSendInd_t *readytosend_ind)
{
struct msgb *resp_msg;
struct osmo_wqueue * queue;
queue = &((l1fh->fl1h)->write_q);
set_current_fn(readytosend_ind->u32Fn);
resp_msg = msgb_dequeue(&queue->msg_queue);
if (!resp_msg) {
resp_msg = gen_dummy_msg();
if (!resp_msg)
return 0;
}
osmo_wqueue_enqueue(&l1fh->udp_wq, resp_msg);
return 1;
}
static int handle_ph_data_ind(struct femtol1_hdl *fl1, GsmL1_PhDataInd_t *data_ind)
{
int rc = 0;
switch (data_ind->sapi) {
case GsmL1_Sapi_Rach:
break;
case GsmL1_Sapi_Pdtch:
case GsmL1_Sapi_Pacch:
pcu_l1if_rx_pdch(data_ind);
break;
case GsmL1_Sapi_Pbcch:
case GsmL1_Sapi_Pagch:
case GsmL1_Sapi_Ppch:
case GsmL1_Sapi_Pnch:
case GsmL1_Sapi_Ptcch:
case GsmL1_Sapi_Prach:
break;
default:
//LOGP(DGPRS, LOGL_NOTICE, "Rx PH-DATA.ind for unknown L1 SAPI %u \n", data_ind->sapi);
break;
}
return rc;
}
static int handle_ph_ra_ind(struct femtol1_hdl *fl1, GsmL1_PhRaInd_t *ra_ind)
{
int rc = 0;
(l1fh->fl1h)->channel_info.ta = ra_ind->measParam.i16BurstTiming;
rc = gprs_rlcmac_rcv_rach(ra_ind->msgUnitParam.u8Buffer[0], ra_ind->u32Fn, ra_ind->measParam.i16BurstTiming);
return rc;
}
/* handle any random indication from the L1 */
int pcu_l1if_handle_l1prim(struct femtol1_hdl *fl1, struct msgb *msg)
{
GsmL1_Prim_t *l1p = msgb_l1prim(msg);
int rc = 0;
switch (l1p->id) {
case GsmL1_PrimId_PhConnectInd:
rc = handle_ph_connect_ind(fl1, &l1p->u.phConnectInd);
break;
case GsmL1_PrimId_PhReadyToSendInd:
rc = handle_ph_readytosend_ind(fl1, &l1p->u.phReadyToSendInd);
break;
case GsmL1_PrimId_PhDataInd:
rc = handle_ph_data_ind(fl1, &l1p->u.phDataInd);
break;
case GsmL1_PrimId_PhRaInd:
rc = handle_ph_ra_ind(fl1, &l1p->u.phRaInd);
break;
default:
break;
}
/* Special return value '1' means: do not free */
if (rc != 1)
msgb_free(msg);
return rc;
}
void gsmtap_send_llc(uint8_t * data, unsigned len)
{
char buffer[MAX_UDP_LENGTH];
int ofs = 0;
// Build header
struct gsmtap_hdr *header = (struct gsmtap_hdr *)buffer;
header->version = 2;
header->hdr_len = sizeof(struct gsmtap_hdr) >> 2;
header->type = 0x08;
header->timeslot = 5;
header->arfcn = 0;
header->signal_dbm = 0;
header->snr_db = 0;
header->frame_number = 0;
header->sub_type = 0;
header->antenna_nr = 0;
header->sub_slot = 0;
header->res = 0;
ofs += sizeof(*header);
// Add frame data
unsigned j = 0;
for (unsigned i = ofs; i < len+ofs; i++)
{
buffer[i] = (char)data[j];
j++;
}
ofs += len;
// Write the GSMTAP packet
pcu_gsmtap_socket.write(buffer, ofs);
}
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