92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
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/* pcu_l1_if.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <Sockets.h>
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#include <gsmtap.h>
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#include <gprs_rlcmac.h>
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#include <Threads.h>
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#include <pcu_l1_if.h>
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#define MAX_UDP_LENGTH 1500
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// TODO: We should take ports and IP from config.
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UDPSocket pcu_l1if_socket(5070, "127.0.0.1", 5934);
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UDPSocket pcu_gsmtap_socket(5077, "127.0.0.1", 4729);
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// Send RLC/MAC block to OpenBTS.
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void pcu_l1if_tx(BitVector * block)
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{
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char buffer[MAX_UDP_LENGTH];
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int ofs = 0;
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block->pack((unsigned char*)&buffer[ofs]);
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ofs += block->size() >> 3;
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COUT("Send to OpenBTS: " << *block);
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pcu_l1if_socket.write(buffer, ofs);
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}
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// Recieve RLC/MAC block from OpenBTS.
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void *pcu_l1if_rx(void *)
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{
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BitVector *block = new BitVector(23*8);
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pcu_l1if_socket.nonblocking();
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while (1) {
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char buf[MAX_UDP_LENGTH];
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int count = pcu_l1if_socket.read(buf, 3000);
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if (count>0) {
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block->unpack((const unsigned char*)buf);
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COUT("Recieve from OpenBTS (MS): " << *block);
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gprs_rlcmac_rcv_block(block);
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}
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}
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}
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void gsmtap_send_llc(uint8_t * data, unsigned len)
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{
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char buffer[MAX_UDP_LENGTH];
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int ofs = 0;
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// Build header
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struct gsmtap_hdr *header = (struct gsmtap_hdr *)buffer;
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header->version = 2;
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header->hdr_len = sizeof(struct gsmtap_hdr) >> 2;
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header->type = 0x08;
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header->timeslot = 5;
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header->arfcn = 0;
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header->signal_dbm = 0;
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header->snr_db = 0;
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header->frame_number = 0;
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header->sub_type = 0;
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header->antenna_nr = 0;
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header->sub_slot = 0;
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header->res = 0;
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ofs += sizeof(*header);
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// Add frame data
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unsigned j = 0;
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for (unsigned i = ofs; i < len+ofs; i++)
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{
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buffer[i] = (char)data[j];
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j++;
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}
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ofs += len;
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// Write the GSMTAP packet
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pcu_gsmtap_socket.write(buffer, ofs);
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}
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