Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/gprs_rlcmac.cpp

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2.6 KiB

/* gprs_rlcmac.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* Copyright (C) 2013 by Holger Hans Peter Freyther
*
* 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.
*/
extern "C" {
#include <osmocom/gsm/gsm48.h>
}
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
#include <bts.h>
#include <encoding.h>
#include <tbf.h>
#include <gprs_debug.h>
extern void *tall_pcu_ctx;
int gprs_rlcmac_paging_request(struct gprs_rlcmac_bts *bts, const struct osmo_mobile_identity *mi,
uint16_t pgroup)
{
if (log_check_level(DRLCMAC, LOGL_NOTICE)) {
char str[64];
osmo_mobile_identity_to_str_buf(str, sizeof(str), mi);
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Paging Request (CCCH) MI=%s\n", str);
}
bitvec *paging_request = bitvec_alloc(22, tall_pcu_ctx);
bitvec_unhex(paging_request, DUMMY_VEC);
int plen = Encoding::write_paging_request(paging_request, mi);
if (plen <= 0) {
LOGP(DRLCMAC, LOGL_ERROR, "TX: [PCU -> BTS] Failed to encode Paging Request\n");
return -1;
}
bts_do_rate_ctr_inc(bts, CTR_PCH_REQUESTS);
pcu_l1if_tx_pch(bts, paging_request, plen, pgroup);
bitvec_free(paging_request);
return 0;
}
/* Encode Application Information Request to Packet Application Information (3GPP TS 44.060 11.2.47) */
struct msgb *gprs_rlcmac_app_info_msg(const struct gsm_pcu_if_app_info_req *req) {
struct msgb *msg;
uint16_t msgb_len = req->len + 1;
struct bitvec bv = {0, msgb_len, NULL};
const enum bit_value page_mode[] = {ZERO, ZERO}; /* Normal Paging (3GPP TS 44.060 12.20) */
if (!req->len) {
LOGP(DRLCMAC, LOGL_ERROR, "Application Information Request with zero length received!\n");
return NULL;
}
msg = msgb_alloc(msgb_len, "app_info_msg");
if (!msg)
return NULL;
bv.data = msgb_put(msg, msgb_len);
bitvec_set_bits(&bv, page_mode, 2);
bitvec_set_uint(&bv, req->application_type, 4);
bitvec_set_bytes(&bv, req->data, req->len);
return msg;
}