Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 1 | /* pcu_sock.c: Connect from PCU via unix domain socket */ |
| 2 | |
| 3 | /* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org> |
| 4 | * (C) 2009-2012 by Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * (C) 2012 by Holger Hans Peter Freyther |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <unistd.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <errno.h> |
| 29 | #include <assert.h> |
| 30 | #include <sys/socket.h> |
| 31 | #include <sys/un.h> |
| 32 | |
| 33 | #include <osmocom/core/talloc.h> |
| 34 | #include <osmocom/core/select.h> |
| 35 | #include <osmocom/core/socket.h> |
| 36 | #include <osmocom/core/logging.h> |
| 37 | #include <osmocom/gsm/l1sap.h> |
| 38 | #include <osmocom/gsm/gsm0502.h> |
| 39 | |
| 40 | #include <openbsc/gsm_data.h> |
| 41 | #include <openbsc/pcu_if.h> |
| 42 | #include <openbsc/pcuif_proto.h> |
| 43 | #include <openbsc/signal.h> |
| 44 | #include <openbsc/debug.h> |
| 45 | #include <openbsc/abis_rsl.h> |
| 46 | |
| 47 | static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg); |
| 48 | uint32_t trx_get_hlayer1(struct gsm_bts_trx *trx); |
Alexander Couzens | 531a9e3 | 2016-11-29 00:18:26 +0100 | [diff] [blame] | 49 | int pcu_direct = 1; |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 50 | |
| 51 | static const char *sapi_string[] = { |
| 52 | [PCU_IF_SAPI_RACH] = "RACH", |
| 53 | [PCU_IF_SAPI_AGCH] = "AGCH", |
| 54 | [PCU_IF_SAPI_PCH] = "PCH", |
| 55 | [PCU_IF_SAPI_BCCH] = "BCCH", |
| 56 | [PCU_IF_SAPI_PDTCH] = "PDTCH", |
| 57 | [PCU_IF_SAPI_PRACH] = "PRACH", |
| 58 | [PCU_IF_SAPI_PTCCH] = "PTCCH", |
| 59 | }; |
| 60 | |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 61 | /* Check if BTS has a PCU connection */ |
| 62 | static bool pcu_connected(struct gsm_bts *bts) |
| 63 | { |
| 64 | struct pcu_sock_state *state = bts->pcu_state; |
| 65 | |
| 66 | if (!state) |
| 67 | return false; |
| 68 | if (state->conn_bfd.fd <= 0) |
| 69 | return false; |
| 70 | return true; |
| 71 | } |
| 72 | |
| 73 | /* |
| 74 | * PCU messages |
| 75 | */ |
| 76 | |
| 77 | /* Set up an message buffer to package an pcu interface message */ |
| 78 | struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr) |
| 79 | { |
| 80 | struct msgb *msg; |
| 81 | struct gsm_pcu_if *pcu_prim; |
| 82 | |
| 83 | msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx"); |
| 84 | if (!msg) |
| 85 | return NULL; |
| 86 | |
| 87 | msgb_put(msg, sizeof(struct gsm_pcu_if)); |
| 88 | pcu_prim = (struct gsm_pcu_if *) msg->data; |
| 89 | pcu_prim->msg_type = msg_type; |
| 90 | pcu_prim->bts_nr = bts_nr; |
| 91 | |
| 92 | return msg; |
| 93 | } |
| 94 | |
| 95 | /* Helper function exclusivly used by pcu_if_signal_cb() */ |
| 96 | static bool ts_should_be_pdch(struct gsm_bts_trx_ts *ts) { |
| 97 | if (ts->pchan == GSM_PCHAN_PDCH) |
| 98 | return true; |
| 99 | if (ts->pchan == GSM_PCHAN_TCH_F_PDCH) { |
| 100 | /* When we're busy deactivating the PDCH, we first set |
| 101 | * DEACT_PENDING, tell the PCU about it and wait for a |
| 102 | * response. So DEACT_PENDING means "no PDCH" to the PCU. |
| 103 | * Similarly, when we're activating PDCH, we set the |
| 104 | * ACT_PENDING and wait for an activation response from the |
| 105 | * PCU, so ACT_PENDING means "is PDCH". */ |
| 106 | if (ts->flags & TS_F_PDCH_ACTIVE) |
| 107 | return !(ts->flags & TS_F_PDCH_DEACT_PENDING); |
| 108 | else |
| 109 | return (ts->flags & TS_F_PDCH_ACT_PENDING); |
| 110 | } |
| 111 | if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) { |
| 112 | /* |
| 113 | * When we're busy de-/activating the PDCH, we first set |
| 114 | * ts->dyn.pchan_want, tell the PCU about it and wait for a |
| 115 | * response. So only care about dyn.pchan_want here. |
| 116 | */ |
| 117 | return ts->dyn.pchan_want == GSM_PCHAN_PDCH; |
| 118 | } |
| 119 | return false; |
| 120 | } |
| 121 | |
| 122 | /* Send BTS properties to the PCU */ |
| 123 | static int pcu_tx_info_ind(struct gsm_bts *bts) |
| 124 | { |
| 125 | struct msgb *msg; |
| 126 | struct gsm_pcu_if *pcu_prim; |
| 127 | struct gsm_pcu_if_info_ind *info_ind; |
| 128 | struct gprs_rlc_cfg *rlcc; |
| 129 | struct gsm_bts_gprs_nsvc *nsvc; |
| 130 | struct gsm_bts_trx *trx; |
| 131 | struct gsm_bts_trx_ts *ts; |
| 132 | int i, j; |
| 133 | |
| 134 | OSMO_ASSERT(bts); |
| 135 | OSMO_ASSERT(bts->network); |
| 136 | |
| 137 | LOGP(DPCU, LOGL_INFO, "Sending info for BTS %d\n",bts->nr); |
| 138 | |
| 139 | rlcc = &bts->gprs.cell.rlc_cfg; |
| 140 | |
| 141 | msg = pcu_msgb_alloc(PCU_IF_MSG_INFO_IND, bts->nr); |
| 142 | if (!msg) |
| 143 | return -ENOMEM; |
| 144 | |
| 145 | pcu_prim = (struct gsm_pcu_if *) msg->data; |
| 146 | info_ind = &pcu_prim->u.info_ind; |
| 147 | info_ind->version = PCU_IF_VERSION; |
| 148 | info_ind->flags |= PCU_IF_FLAG_ACTIVE; |
| 149 | |
| 150 | if (pcu_direct) |
| 151 | info_ind->flags |= PCU_IF_FLAG_SYSMO; |
| 152 | |
| 153 | /* RAI */ |
| 154 | info_ind->mcc = bts->network->country_code; |
| 155 | info_ind->mnc = bts->network->network_code; |
| 156 | info_ind->lac = bts->location_area_code; |
| 157 | info_ind->rac = bts->gprs.rac; |
| 158 | |
| 159 | /* NSE */ |
| 160 | info_ind->nsei = bts->gprs.nse.nsei; |
| 161 | memcpy(info_ind->nse_timer, bts->gprs.nse.timer, 7); |
| 162 | memcpy(info_ind->cell_timer, bts->gprs.cell.timer, 11); |
| 163 | |
| 164 | /* cell attributes */ |
| 165 | info_ind->cell_id = bts->cell_identity; |
| 166 | info_ind->repeat_time = rlcc->paging.repeat_time; |
| 167 | info_ind->repeat_count = rlcc->paging.repeat_count; |
| 168 | info_ind->bvci = bts->gprs.cell.bvci; |
| 169 | info_ind->t3142 = rlcc->parameter[RLC_T3142]; |
| 170 | info_ind->t3169 = rlcc->parameter[RLC_T3169]; |
| 171 | info_ind->t3191 = rlcc->parameter[RLC_T3191]; |
| 172 | info_ind->t3193_10ms = rlcc->parameter[RLC_T3193]; |
| 173 | info_ind->t3195 = rlcc->parameter[RLC_T3195]; |
| 174 | info_ind->n3101 = rlcc->parameter[RLC_N3101]; |
| 175 | info_ind->n3103 = rlcc->parameter[RLC_N3103]; |
| 176 | info_ind->n3105 = rlcc->parameter[RLC_N3105]; |
| 177 | info_ind->cv_countdown = rlcc->parameter[CV_COUNTDOWN]; |
| 178 | if (rlcc->cs_mask & (1 << GPRS_CS1)) |
| 179 | info_ind->flags |= PCU_IF_FLAG_CS1; |
| 180 | if (rlcc->cs_mask & (1 << GPRS_CS2)) |
| 181 | info_ind->flags |= PCU_IF_FLAG_CS2; |
| 182 | if (rlcc->cs_mask & (1 << GPRS_CS3)) |
| 183 | info_ind->flags |= PCU_IF_FLAG_CS3; |
| 184 | if (rlcc->cs_mask & (1 << GPRS_CS4)) |
| 185 | info_ind->flags |= PCU_IF_FLAG_CS4; |
| 186 | if (bts->gprs.mode == BTS_GPRS_EGPRS) { |
| 187 | if (rlcc->cs_mask & (1 << GPRS_MCS1)) |
| 188 | info_ind->flags |= PCU_IF_FLAG_MCS1; |
| 189 | if (rlcc->cs_mask & (1 << GPRS_MCS2)) |
| 190 | info_ind->flags |= PCU_IF_FLAG_MCS2; |
| 191 | if (rlcc->cs_mask & (1 << GPRS_MCS3)) |
| 192 | info_ind->flags |= PCU_IF_FLAG_MCS3; |
| 193 | if (rlcc->cs_mask & (1 << GPRS_MCS4)) |
| 194 | info_ind->flags |= PCU_IF_FLAG_MCS4; |
| 195 | if (rlcc->cs_mask & (1 << GPRS_MCS5)) |
| 196 | info_ind->flags |= PCU_IF_FLAG_MCS5; |
| 197 | if (rlcc->cs_mask & (1 << GPRS_MCS6)) |
| 198 | info_ind->flags |= PCU_IF_FLAG_MCS6; |
| 199 | if (rlcc->cs_mask & (1 << GPRS_MCS7)) |
| 200 | info_ind->flags |= PCU_IF_FLAG_MCS7; |
| 201 | if (rlcc->cs_mask & (1 << GPRS_MCS8)) |
| 202 | info_ind->flags |= PCU_IF_FLAG_MCS8; |
| 203 | if (rlcc->cs_mask & (1 << GPRS_MCS9)) |
| 204 | info_ind->flags |= PCU_IF_FLAG_MCS9; |
| 205 | } |
| 206 | #warning "isn't dl_tbf_ext wrong?: * 10 and no ntohs" |
| 207 | info_ind->dl_tbf_ext = rlcc->parameter[T_DL_TBF_EXT]; |
| 208 | #warning "isn't ul_tbf_ext wrong?: * 10 and no ntohs" |
| 209 | info_ind->ul_tbf_ext = rlcc->parameter[T_UL_TBF_EXT]; |
| 210 | info_ind->initial_cs = rlcc->initial_cs; |
| 211 | info_ind->initial_mcs = rlcc->initial_mcs; |
| 212 | |
| 213 | /* NSVC */ |
Harald Welte | 9bf76c8 | 2016-11-17 18:39:36 +0100 | [diff] [blame] | 214 | for (i = 0; i < ARRAY_SIZE(info_ind->nsvci); i++) { |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 215 | nsvc = &bts->gprs.nsvc[i]; |
| 216 | info_ind->nsvci[i] = nsvc->nsvci; |
| 217 | info_ind->local_port[i] = nsvc->local_port; |
| 218 | info_ind->remote_port[i] = nsvc->remote_port; |
| 219 | info_ind->remote_ip[i] = nsvc->remote_ip; |
| 220 | } |
| 221 | |
Harald Welte | 9bf76c8 | 2016-11-17 18:39:36 +0100 | [diff] [blame] | 222 | for (i = 0; i < ARRAY_SIZE(info_ind->trx); i++) { |
Harald Welte | e623ccb | 2016-11-17 18:10:10 +0100 | [diff] [blame] | 223 | trx = gsm_bts_trx_num(bts, i); |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 224 | if (!trx) |
Alexander Couzens | 6fb6783 | 2016-11-29 00:21:18 +0100 | [diff] [blame^] | 225 | continue; |
Harald Welte | 4d20529 | 2016-11-21 01:33:22 +0100 | [diff] [blame] | 226 | info_ind->trx[i].hlayer1 = 0x2342; |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 227 | info_ind->trx[i].pdch_mask = 0; |
| 228 | info_ind->trx[i].arfcn = trx->arfcn; |
Harald Welte | 9bf76c8 | 2016-11-17 18:39:36 +0100 | [diff] [blame] | 229 | for (j = 0; j < ARRAY_SIZE(trx->ts); j++) { |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 230 | ts = &trx->ts[j]; |
| 231 | if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED |
| 232 | && ts_should_be_pdch(ts)) { |
| 233 | info_ind->trx[i].pdch_mask |= (1 << j); |
| 234 | info_ind->trx[i].tsc[j] = |
| 235 | (ts->tsc >= 0) ? ts->tsc : bts->bsic & 7; |
| 236 | LOGP(DPCU, LOGL_INFO, "trx=%d ts=%d: " |
| 237 | "available (tsc=%d arfcn=%d)\n", |
| 238 | trx->nr, ts->nr, |
| 239 | info_ind->trx[i].tsc[j], |
| 240 | info_ind->trx[i].arfcn); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | return pcu_sock_send(bts, msg); |
| 246 | } |
| 247 | |
| 248 | void pcu_info_update(struct gsm_bts *bts) |
| 249 | { |
| 250 | if (pcu_connected(bts)) |
| 251 | pcu_tx_info_ind(bts); |
| 252 | } |
| 253 | |
| 254 | /* Forward rach indication to PCU */ |
| 255 | int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn, |
| 256 | uint8_t is_11bit, enum ph_burst_type burst_type) |
| 257 | { |
| 258 | struct msgb *msg; |
| 259 | struct gsm_pcu_if *pcu_prim; |
| 260 | struct gsm_pcu_if_rach_ind *rach_ind; |
| 261 | |
| 262 | /* Bail if no PCU is connected */ |
| 263 | if (!pcu_connected(bts)) { |
| 264 | LOGP(DRSL, LOGL_ERROR, "BTS %d CHAN RQD(GPRS) but PCU not " |
| 265 | "connected!\n", bts->nr); |
| 266 | return -ENODEV; |
| 267 | } |
| 268 | |
| 269 | LOGP(DPCU, LOGL_INFO, "Sending RACH indication: qta=%d, ra=%d, " |
| 270 | "fn=%d\n", qta, ra, fn); |
| 271 | |
| 272 | msg = pcu_msgb_alloc(PCU_IF_MSG_RACH_IND, bts->nr); |
| 273 | if (!msg) |
| 274 | return -ENOMEM; |
| 275 | pcu_prim = (struct gsm_pcu_if *) msg->data; |
| 276 | rach_ind = &pcu_prim->u.rach_ind; |
| 277 | |
| 278 | rach_ind->sapi = PCU_IF_SAPI_RACH; |
| 279 | rach_ind->ra = ra; |
| 280 | rach_ind->qta = qta; |
| 281 | rach_ind->fn = fn; |
| 282 | rach_ind->is_11bit = is_11bit; |
| 283 | rach_ind->burst_type = burst_type; |
| 284 | |
| 285 | return pcu_sock_send(bts, msg); |
| 286 | } |
| 287 | |
Harald Welte | ea1056f | 2016-11-17 20:54:47 +0100 | [diff] [blame] | 288 | /* we need to decode the raw RR paging messsage (see PCU code |
| 289 | * Encoding::write_paging_request) and extract the mobile identity |
| 290 | * (P-TMSI) from it */ |
| 291 | static int pcu_rx_rr_paging(struct gsm_bts *bts, uint8_t paging_group, |
| 292 | const uint8_t *raw_rr_msg) |
| 293 | { |
| 294 | struct gsm48_hdr *gsmh = (struct gsm48_hdr *) raw_rr_msg; |
| 295 | struct gsm48_paging1 *p1 = (struct gsm48_paging1 *) gsmh; |
| 296 | uint8_t chan_needed; |
| 297 | unsigned int mi_len; |
| 298 | uint8_t *mi; |
| 299 | int rc; |
| 300 | |
| 301 | switch (gsmh->msg_type) { |
| 302 | case GSM48_MT_RR_PAG_REQ_1: |
| 303 | chan_needed = (p1->cneed2 << 2) | p1->cneed1; |
| 304 | mi_len = p1->data[0]; |
| 305 | mi = p1->data+1; |
| 306 | /* FIXME: why does rsl_paging_cmd add 2 to mi? */ |
| 307 | rc = rsl_paging_cmd(bts, paging_group, mi_len, mi, |
| 308 | chan_needed, true); |
| 309 | break; |
| 310 | case GSM48_MT_RR_PAG_REQ_2: |
| 311 | case GSM48_MT_RR_PAG_REQ_3: |
| 312 | LOGP(DPCU, LOGL_ERROR, "PCU Sends unsupported paging " |
| 313 | "request type\n"); |
| 314 | rc = -EINVAL; |
| 315 | break; |
| 316 | } |
| 317 | |
| 318 | return rc; |
| 319 | } |
| 320 | |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 321 | static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type, |
| 322 | struct gsm_pcu_if_data *data_req) |
| 323 | { |
| 324 | uint8_t is_ptcch; |
| 325 | struct gsm_bts_trx *trx; |
| 326 | struct gsm_bts_trx_ts *ts; |
| 327 | struct msgb *msg; |
Harald Welte | ea1056f | 2016-11-17 20:54:47 +0100 | [diff] [blame] | 328 | char imsi_digit_buf[4]; |
| 329 | uint8_t pag_grp; |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 330 | int rc = 0; |
| 331 | |
| 332 | LOGP(DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d " |
| 333 | "block=%d data=%s\n", sapi_string[data_req->sapi], |
| 334 | data_req->arfcn, data_req->block_nr, |
| 335 | osmo_hexdump(data_req->data, data_req->len)); |
| 336 | |
| 337 | switch (data_req->sapi) { |
| 338 | case PCU_IF_SAPI_PCH: |
Harald Welte | ea1056f | 2016-11-17 20:54:47 +0100 | [diff] [blame] | 339 | /* the first three bytes are the last three digits of |
| 340 | * the IMSI, which we need to compute the paging group */ |
| 341 | imsi_digit_buf[0] = data_req->data[0]; |
| 342 | imsi_digit_buf[1] = data_req->data[1]; |
| 343 | imsi_digit_buf[2] = data_req->data[2]; |
| 344 | imsi_digit_buf[3] = '\0'; |
| 345 | pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc, |
| 346 | str_to_imsi(imsi_digit_buf)); |
| 347 | pcu_rx_rr_paging(bts, pag_grp, data_req->data+3); |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 348 | break; |
| 349 | case PCU_IF_SAPI_AGCH: |
| 350 | msg = msgb_alloc(data_req->len, "pcu_agch"); |
| 351 | if (!msg) { |
| 352 | rc = -ENOMEM; |
| 353 | break; |
| 354 | } |
| 355 | msg->l3h = msgb_put(msg, data_req->len); |
| 356 | memcpy(msg->l3h, data_req->data, data_req->len); |
| 357 | |
| 358 | if (rsl_imm_assign_cmd(bts, msg->len, msg->data)) { |
| 359 | msgb_free(msg); |
| 360 | rc = -EIO; |
| 361 | } |
| 362 | break; |
| 363 | default: |
| 364 | LOGP(DPCU, LOGL_ERROR, "Received PCU data request with " |
| 365 | "unsupported sapi %d\n", data_req->sapi); |
| 366 | rc = -EINVAL; |
| 367 | } |
| 368 | |
| 369 | return rc; |
| 370 | } |
| 371 | |
| 372 | static int pcu_rx(struct gsm_network *net, uint8_t msg_type, |
| 373 | struct gsm_pcu_if *pcu_prim) |
| 374 | { |
| 375 | int rc = 0; |
| 376 | struct gsm_bts *bts; |
| 377 | |
| 378 | /* FIXME: allow multiple BTS */ |
| 379 | bts = llist_entry(net->bts_list.next, struct gsm_bts, list); |
| 380 | |
| 381 | switch (msg_type) { |
| 382 | case PCU_IF_MSG_DATA_REQ: |
| 383 | case PCU_IF_MSG_PAG_REQ: |
| 384 | rc = pcu_rx_data_req(bts, msg_type, &pcu_prim->u.data_req); |
| 385 | break; |
| 386 | default: |
| 387 | LOGP(DPCU, LOGL_ERROR, "Received unknwon PCU msg type %d\n", |
| 388 | msg_type); |
| 389 | rc = -EINVAL; |
| 390 | } |
| 391 | |
| 392 | return rc; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * PCU socket interface |
| 397 | */ |
| 398 | |
| 399 | static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg) |
| 400 | { |
| 401 | struct pcu_sock_state *state = bts->pcu_state; |
| 402 | struct osmo_fd *conn_bfd; |
| 403 | struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msg->data; |
| 404 | |
| 405 | if (!state) { |
| 406 | if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND) |
| 407 | LOGP(DPCU, LOGL_INFO, "PCU socket not created, " |
| 408 | "dropping message\n"); |
| 409 | msgb_free(msg); |
| 410 | return -EINVAL; |
| 411 | } |
| 412 | conn_bfd = &state->conn_bfd; |
| 413 | if (conn_bfd->fd <= 0) { |
| 414 | if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND) |
| 415 | LOGP(DPCU, LOGL_NOTICE, "PCU socket not connected, " |
| 416 | "dropping message\n"); |
| 417 | msgb_free(msg); |
| 418 | return -EIO; |
| 419 | } |
| 420 | msgb_enqueue(&state->upqueue, msg); |
| 421 | conn_bfd->when |= BSC_FD_WRITE; |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | static void pcu_sock_close(struct pcu_sock_state *state) |
| 427 | { |
| 428 | struct osmo_fd *bfd = &state->conn_bfd; |
| 429 | struct gsm_bts *bts; |
| 430 | struct gsm_bts_trx *trx; |
| 431 | struct gsm_bts_trx_ts *ts; |
| 432 | int i, j; |
| 433 | |
| 434 | /* FIXME: allow multiple BTS */ |
| 435 | bts = llist_entry(state->net->bts_list.next, struct gsm_bts, list); |
| 436 | |
| 437 | LOGP(DPCU, LOGL_NOTICE, "PCU socket has LOST connection\n"); |
| 438 | |
| 439 | close(bfd->fd); |
| 440 | bfd->fd = -1; |
| 441 | osmo_fd_unregister(bfd); |
| 442 | |
| 443 | /* re-enable the generation of ACCEPT for new connections */ |
| 444 | state->listen_bfd.when |= BSC_FD_READ; |
| 445 | |
| 446 | #if 0 |
| 447 | /* remove si13, ... */ |
| 448 | bts->si_valid &= ~(1 << SYSINFO_TYPE_13); |
| 449 | osmo_signal_dispatch(SS_GLOBAL, S_NEW_SYSINFO, bts); |
| 450 | #endif |
| 451 | |
| 452 | /* release PDCH */ |
| 453 | for (i = 0; i < 8; i++) { |
Harald Welte | e623ccb | 2016-11-17 18:10:10 +0100 | [diff] [blame] | 454 | trx = gsm_bts_trx_num(bts, i); |
Philipp Maier | e1fb066 | 2016-10-26 15:19:41 +0200 | [diff] [blame] | 455 | if (!trx) |
| 456 | break; |
| 457 | for (j = 0; j < 8; j++) { |
| 458 | ts = &trx->ts[j]; |
| 459 | if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED |
| 460 | && ts->pchan == GSM_PCHAN_PDCH) { |
| 461 | printf("l1sap_chan_rel(trx,gsm_lchan2chan_nr(ts->lchan));\n"); |
| 462 | } |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* flush the queue */ |
| 467 | while (!llist_empty(&state->upqueue)) { |
| 468 | struct msgb *msg = msgb_dequeue(&state->upqueue); |
| 469 | msgb_free(msg); |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | static int pcu_sock_read(struct osmo_fd *bfd) |
| 474 | { |
| 475 | struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; |
| 476 | struct gsm_pcu_if *pcu_prim; |
| 477 | struct msgb *msg; |
| 478 | int rc; |
| 479 | |
| 480 | msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx"); |
| 481 | if (!msg) |
| 482 | return -ENOMEM; |
| 483 | |
| 484 | pcu_prim = (struct gsm_pcu_if *) msg->tail; |
| 485 | |
| 486 | rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); |
| 487 | if (rc == 0) |
| 488 | goto close; |
| 489 | |
| 490 | if (rc < 0) { |
| 491 | if (errno == EAGAIN) |
| 492 | return 0; |
| 493 | goto close; |
| 494 | } |
| 495 | |
| 496 | rc = pcu_rx(state->net, pcu_prim->msg_type, pcu_prim); |
| 497 | |
| 498 | /* as we always synchronously process the message in pcu_rx() and |
| 499 | * its callbacks, we can free the message here. */ |
| 500 | msgb_free(msg); |
| 501 | |
| 502 | return rc; |
| 503 | |
| 504 | close: |
| 505 | msgb_free(msg); |
| 506 | pcu_sock_close(state); |
| 507 | return -1; |
| 508 | } |
| 509 | |
| 510 | static int pcu_sock_write(struct osmo_fd *bfd) |
| 511 | { |
| 512 | struct pcu_sock_state *state = bfd->data; |
| 513 | int rc; |
| 514 | |
| 515 | while (!llist_empty(&state->upqueue)) { |
| 516 | struct msgb *msg, *msg2; |
| 517 | struct gsm_pcu_if *pcu_prim; |
| 518 | |
| 519 | /* peek at the beginning of the queue */ |
| 520 | msg = llist_entry(state->upqueue.next, struct msgb, list); |
| 521 | pcu_prim = (struct gsm_pcu_if *)msg->data; |
| 522 | |
| 523 | bfd->when &= ~BSC_FD_WRITE; |
| 524 | |
| 525 | /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ |
| 526 | if (!msgb_length(msg)) { |
| 527 | LOGP(DPCU, LOGL_ERROR, "message type (%d) with ZERO " |
| 528 | "bytes!\n", pcu_prim->msg_type); |
| 529 | goto dontsend; |
| 530 | } |
| 531 | |
| 532 | /* try to send it over the socket */ |
| 533 | rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); |
| 534 | if (rc == 0) |
| 535 | goto close; |
| 536 | if (rc < 0) { |
| 537 | if (errno == EAGAIN) { |
| 538 | bfd->when |= BSC_FD_WRITE; |
| 539 | break; |
| 540 | } |
| 541 | goto close; |
| 542 | } |
| 543 | |
| 544 | dontsend: |
| 545 | /* _after_ we send it, we can deueue */ |
| 546 | msg2 = msgb_dequeue(&state->upqueue); |
| 547 | assert(msg == msg2); |
| 548 | msgb_free(msg); |
| 549 | } |
| 550 | return 0; |
| 551 | |
| 552 | close: |
| 553 | pcu_sock_close(state); |
| 554 | |
| 555 | return -1; |
| 556 | } |
| 557 | |
| 558 | static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags) |
| 559 | { |
| 560 | int rc = 0; |
| 561 | |
| 562 | if (flags & BSC_FD_READ) |
| 563 | rc = pcu_sock_read(bfd); |
| 564 | if (rc < 0) |
| 565 | return rc; |
| 566 | |
| 567 | if (flags & BSC_FD_WRITE) |
| 568 | rc = pcu_sock_write(bfd); |
| 569 | |
| 570 | return rc; |
| 571 | } |
| 572 | |
| 573 | /* accept connection comming from PCU */ |
| 574 | static int pcu_sock_accept(struct osmo_fd *bfd, unsigned int flags) |
| 575 | { |
| 576 | struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; |
| 577 | struct osmo_fd *conn_bfd = &state->conn_bfd; |
| 578 | struct sockaddr_un un_addr; |
| 579 | socklen_t len; |
| 580 | int rc; |
| 581 | |
| 582 | len = sizeof(un_addr); |
| 583 | rc = accept(bfd->fd, (struct sockaddr *) &un_addr, &len); |
| 584 | if (rc < 0) { |
| 585 | LOGP(DPCU, LOGL_ERROR, "Failed to accept a new connection\n"); |
| 586 | return -1; |
| 587 | } |
| 588 | |
| 589 | if (conn_bfd->fd >= 0) { |
| 590 | LOGP(DPCU, LOGL_NOTICE, "PCU connects but we already have " |
| 591 | "another active connection ?!?\n"); |
| 592 | /* We already have one PCU connected, this is all we support */ |
| 593 | state->listen_bfd.when &= ~BSC_FD_READ; |
| 594 | close(rc); |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | conn_bfd->fd = rc; |
| 599 | conn_bfd->when = BSC_FD_READ; |
| 600 | conn_bfd->cb = pcu_sock_cb; |
| 601 | conn_bfd->data = state; |
| 602 | |
| 603 | if (osmo_fd_register(conn_bfd) != 0) { |
| 604 | LOGP(DPCU, LOGL_ERROR, "Failed to register new connection " |
| 605 | "fd\n"); |
| 606 | close(conn_bfd->fd); |
| 607 | conn_bfd->fd = -1; |
| 608 | return -1; |
| 609 | } |
| 610 | |
| 611 | LOGP(DPCU, LOGL_NOTICE, "PCU socket connected to external PCU\n"); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | /* Open connection to PCU */ |
| 617 | int pcu_sock_init(const char *path, struct gsm_bts *bts) |
| 618 | { |
| 619 | struct pcu_sock_state *state; |
| 620 | struct osmo_fd *bfd; |
| 621 | int rc; |
| 622 | |
| 623 | state = talloc_zero(NULL, struct pcu_sock_state); |
| 624 | if (!state) |
| 625 | return -ENOMEM; |
| 626 | |
| 627 | INIT_LLIST_HEAD(&state->upqueue); |
| 628 | state->net = bts->network; |
| 629 | state->conn_bfd.fd = -1; |
| 630 | |
| 631 | bfd = &state->listen_bfd; |
| 632 | |
| 633 | bfd->fd = osmo_sock_unix_init(SOCK_SEQPACKET, 0, path, |
| 634 | OSMO_SOCK_F_BIND); |
| 635 | if (bfd->fd < 0) { |
| 636 | LOGP(DPCU, LOGL_ERROR, "Could not create unix socket: %s\n", |
| 637 | strerror(errno)); |
| 638 | talloc_free(state); |
| 639 | return -1; |
| 640 | } |
| 641 | |
| 642 | bfd->when = BSC_FD_READ; |
| 643 | bfd->cb = pcu_sock_accept; |
| 644 | bfd->data = state; |
| 645 | |
| 646 | rc = osmo_fd_register(bfd); |
| 647 | if (rc < 0) { |
| 648 | LOGP(DPCU, LOGL_ERROR, "Could not register listen fd: %d\n", |
| 649 | rc); |
| 650 | close(bfd->fd); |
| 651 | talloc_free(state); |
| 652 | return rc; |
| 653 | } |
| 654 | |
| 655 | bts->pcu_state = state; |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | /* Close connection to PCU */ |
| 660 | void pcu_sock_exit(struct gsm_bts *bts) |
| 661 | { |
| 662 | struct pcu_sock_state *state = bts->pcu_state; |
| 663 | struct osmo_fd *bfd, *conn_bfd; |
| 664 | |
| 665 | if (!state) |
| 666 | return; |
| 667 | |
| 668 | conn_bfd = &state->conn_bfd; |
| 669 | if (conn_bfd->fd > 0) |
| 670 | pcu_sock_close(state); |
| 671 | bfd = &state->listen_bfd; |
| 672 | close(bfd->fd); |
| 673 | osmo_fd_unregister(bfd); |
| 674 | talloc_free(state); |
| 675 | bts->pcu_state = NULL; |
| 676 | } |
| 677 | |