Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 1 | /* pcu_l1_if.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <Sockets.h> |
| 21 | #include <gsmtap.h> |
| 22 | #include <gprs_rlcmac.h> |
| 23 | #include <Threads.h> |
| 24 | #include <pcu_l1_if.h> |
| 25 | |
| 26 | #define MAX_UDP_LENGTH 1500 |
| 27 | |
| 28 | // TODO: We should take ports and IP from config. |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 29 | UDPSocket pcu_gsmtap_socket(5077, "127.0.0.1", 4729); |
| 30 | |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 31 | // Variable for storage current FN. |
| 32 | int frame_number; |
| 33 | |
| 34 | int get_current_fn() |
| 35 | { |
| 36 | return frame_number; |
| 37 | } |
| 38 | |
| 39 | void set_current_fn(int fn) |
| 40 | { |
| 41 | frame_number = fn; |
| 42 | } |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 43 | |
| 44 | struct msgb *l1p_msgb_alloc(void) |
| 45 | { |
| 46 | struct msgb *msg = msgb_alloc(sizeof(GsmL1_Prim_t), "l1_prim"); |
| 47 | |
| 48 | if (msg) |
| 49 | msg->l1h = msgb_put(msg, sizeof(GsmL1_Prim_t)); |
| 50 | |
| 51 | return msg; |
| 52 | } |
| 53 | |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 54 | struct msgb *gen_dummy_msg(void) |
| 55 | { |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 56 | struct msgb *msg = l1p_msgb_alloc(); |
| 57 | GsmL1_Prim_t *prim = msgb_l1prim(msg); |
| 58 | // RLC/MAC filler with USF=1 |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 59 | bitvec *filler = bitvec_alloc(23); |
| 60 | bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 61 | prim->id = GsmL1_PrimId_PhDataReq; |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 62 | prim->u.phDataReq.sapi = GsmL1_Sapi_Pacch; |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 63 | bitvec_pack(filler, prim->u.phDataReq.msgUnitParam.u8Buffer); |
| 64 | prim->u.phDataReq.msgUnitParam.u8Size = filler->data_len; |
| 65 | bitvec_free(filler); |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 66 | return msg; |
| 67 | } |
| 68 | |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 69 | // Send RLC/MAC block to OpenBTS. |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 70 | void pcu_l1if_tx(bitvec * block, GsmL1_Sapi_t sapi, int len) |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 71 | { |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 72 | struct msgb *msg = l1p_msgb_alloc(); |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 73 | struct osmo_wqueue * queue; |
| 74 | queue = &((l1fh->fl1h)->write_q); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 75 | GsmL1_Prim_t *prim = msgb_l1prim(msg); |
| 76 | |
| 77 | prim->id = GsmL1_PrimId_PhDataReq; |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 78 | prim->u.phDataReq.sapi = sapi; |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 79 | bitvec_pack(block, prim->u.phDataReq.msgUnitParam.u8Buffer); |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 80 | prim->u.phDataReq.msgUnitParam.u8Size = len; |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 81 | //COUT("Add Block to WRITE QUEUE: " << *block); |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 82 | osmo_wqueue_enqueue(queue, msg); |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 83 | } |
| 84 | |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 85 | int pcu_l1if_rx_pdch(GsmL1_PhDataInd_t *data_ind) |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 86 | { |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 87 | bitvec *block = bitvec_alloc(data_ind->msgUnitParam.u8Size); |
| 88 | bitvec_unpack(block, data_ind->msgUnitParam.u8Buffer); |
| 89 | //COUT("RX: " << *block); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 90 | gprs_rlcmac_rcv_block(block); |
Ivan Kluchnikov | 835f91e | 2012-04-30 18:00:36 +0400 | [diff] [blame^] | 91 | bitvec_free(block); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 92 | } |
| 93 | |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 94 | static int handle_ph_connect_ind(struct femtol1_hdl *fl1, GsmL1_PhConnectInd_t *connect_ind) |
| 95 | { |
| 96 | (l1fh->fl1h)->channel_info.arfcn = connect_ind->u16Arfcn; |
| 97 | (l1fh->fl1h)->channel_info.tn = connect_ind->u8Tn; |
| 98 | (l1fh->fl1h)->channel_info.tsc = connect_ind->u8Tsc; |
| 99 | COUT("RX: [ PCU <- BTS ] PhConnectInd: ARFCN: " << connect_ind->u16Arfcn |
| 100 | <<" TN: " << (unsigned)connect_ind->u8Tn << " TSC: " << (unsigned)connect_ind->u8Tsc); |
| 101 | } |
| 102 | |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 103 | static int handle_ph_readytosend_ind(struct femtol1_hdl *fl1, GsmL1_PhReadyToSendInd_t *readytosend_ind) |
| 104 | { |
| 105 | struct msgb *resp_msg; |
| 106 | struct osmo_wqueue * queue; |
| 107 | queue = &((l1fh->fl1h)->write_q); |
| 108 | |
| 109 | set_current_fn(readytosend_ind->u32Fn); |
| 110 | resp_msg = msgb_dequeue(&queue->msg_queue); |
| 111 | if (!resp_msg) { |
| 112 | resp_msg = gen_dummy_msg(); |
| 113 | if (!resp_msg) |
| 114 | return 0; |
| 115 | } |
| 116 | osmo_wqueue_enqueue(&l1fh->udp_wq, resp_msg); |
| 117 | return 1; |
| 118 | } |
| 119 | |
| 120 | static int handle_ph_data_ind(struct femtol1_hdl *fl1, GsmL1_PhDataInd_t *data_ind) |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 121 | { |
| 122 | int rc = 0; |
| 123 | switch (data_ind->sapi) { |
| 124 | case GsmL1_Sapi_Rach: |
| 125 | break; |
| 126 | case GsmL1_Sapi_Pdtch: |
| 127 | case GsmL1_Sapi_Pacch: |
| 128 | pcu_l1if_rx_pdch(data_ind); |
| 129 | break; |
| 130 | case GsmL1_Sapi_Pbcch: |
| 131 | case GsmL1_Sapi_Pagch: |
| 132 | case GsmL1_Sapi_Ppch: |
| 133 | case GsmL1_Sapi_Pnch: |
| 134 | case GsmL1_Sapi_Ptcch: |
| 135 | case GsmL1_Sapi_Prach: |
| 136 | break; |
| 137 | default: |
| 138 | //LOGP(DGPRS, LOGL_NOTICE, "Rx PH-DATA.ind for unknown L1 SAPI %u \n", data_ind->sapi); |
| 139 | break; |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 140 | } |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 141 | |
| 142 | return rc; |
| 143 | } |
| 144 | |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 145 | static int handle_ph_ra_ind(struct femtol1_hdl *fl1, GsmL1_PhRaInd_t *ra_ind) |
| 146 | { |
| 147 | int rc = 0; |
| 148 | (l1fh->fl1h)->channel_info.ta = ra_ind->measParam.i16BurstTiming; |
| 149 | rc = gprs_rlcmac_rcv_rach(ra_ind->msgUnitParam.u8Buffer[0], ra_ind->u32Fn, ra_ind->measParam.i16BurstTiming); |
| 150 | return rc; |
| 151 | } |
| 152 | |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 153 | /* handle any random indication from the L1 */ |
| 154 | int pcu_l1if_handle_l1prim(struct femtol1_hdl *fl1, struct msgb *msg) |
| 155 | { |
| 156 | GsmL1_Prim_t *l1p = msgb_l1prim(msg); |
| 157 | int rc = 0; |
| 158 | |
| 159 | switch (l1p->id) { |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 160 | case GsmL1_PrimId_PhConnectInd: |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 161 | rc = handle_ph_connect_ind(fl1, &l1p->u.phConnectInd); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 162 | break; |
| 163 | case GsmL1_PrimId_PhReadyToSendInd: |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 164 | rc = handle_ph_readytosend_ind(fl1, &l1p->u.phReadyToSendInd); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 165 | break; |
| 166 | case GsmL1_PrimId_PhDataInd: |
Ivan Kluchnikov | 4277f0c | 2012-04-12 14:24:35 +0400 | [diff] [blame] | 167 | rc = handle_ph_data_ind(fl1, &l1p->u.phDataInd); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 168 | break; |
| 169 | case GsmL1_PrimId_PhRaInd: |
Ivan Kluchnikov | 5310d45 | 2012-04-17 22:00:31 +0400 | [diff] [blame] | 170 | rc = handle_ph_ra_ind(fl1, &l1p->u.phRaInd); |
Ivan Kluchnikov | e3a0596 | 2012-03-18 15:48:51 +0400 | [diff] [blame] | 171 | break; |
| 172 | default: |
| 173 | break; |
| 174 | } |
| 175 | |
| 176 | /* Special return value '1' means: do not free */ |
| 177 | if (rc != 1) |
| 178 | msgb_free(msg); |
| 179 | |
| 180 | return rc; |
Ivan Kluchnikov | 8ee6051 | 2012-03-05 19:24:57 +0400 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | void gsmtap_send_llc(uint8_t * data, unsigned len) |
| 184 | { |
| 185 | char buffer[MAX_UDP_LENGTH]; |
| 186 | int ofs = 0; |
| 187 | |
| 188 | // Build header |
| 189 | struct gsmtap_hdr *header = (struct gsmtap_hdr *)buffer; |
| 190 | header->version = 2; |
| 191 | header->hdr_len = sizeof(struct gsmtap_hdr) >> 2; |
| 192 | header->type = 0x08; |
| 193 | header->timeslot = 5; |
| 194 | header->arfcn = 0; |
| 195 | header->signal_dbm = 0; |
| 196 | header->snr_db = 0; |
| 197 | header->frame_number = 0; |
| 198 | header->sub_type = 0; |
| 199 | header->antenna_nr = 0; |
| 200 | header->sub_slot = 0; |
| 201 | header->res = 0; |
| 202 | |
| 203 | ofs += sizeof(*header); |
| 204 | |
| 205 | // Add frame data |
| 206 | unsigned j = 0; |
| 207 | for (unsigned i = ofs; i < len+ofs; i++) |
| 208 | { |
| 209 | buffer[i] = (char)data[j]; |
| 210 | j++; |
| 211 | } |
| 212 | ofs += len; |
| 213 | // Write the GSMTAP packet |
| 214 | pcu_gsmtap_socket.write(buffer, ofs); |
| 215 | } |