| /* 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) |
| { |
| int ofs = 0; |
| struct msgb *msg = l1p_msgb_alloc(); |
| GsmL1_Prim_t *prim = msgb_l1prim(msg); |
| // RLC/MAC filler with USF=1 |
| BitVector filler("0100000110010100001010110010101100101011001010110010101100101011001010110010101100101011001010110010101100101011001010110010101100101011001010110010101100101011001010110010101100101011"); |
| prim->id = GsmL1_PrimId_PhDataReq; |
| prim->u.phDataReq.sapi = GsmL1_Sapi_Pacch; |
| filler.pack((unsigned char*)&(prim->u.phDataReq.msgUnitParam.u8Buffer[ofs])); |
| ofs += filler.size() >> 3; |
| prim->u.phDataReq.msgUnitParam.u8Size = ofs; |
| return msg; |
| } |
| |
| // Send RLC/MAC block to OpenBTS. |
| void pcu_l1if_tx(BitVector * block, GsmL1_Sapi_t sapi, int len) |
| { |
| int ofs = 0; |
| 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; |
| block->pack((unsigned char*)&(prim->u.phDataReq.msgUnitParam.u8Buffer[ofs])); |
| ofs += block->size() >> 3; |
| 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) |
| { |
| BitVector *block = new BitVector(23*8); |
| block->unpack((const unsigned char*)data_ind->msgUnitParam.u8Buffer); |
| COUT("RX: " << *block); |
| |
| gprs_rlcmac_rcv_block(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); |
| } |