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osmo-bts/src/common/pcu_sock.c

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/* pcu_sock.c: Connect from PCU via unix domain socket */
/* (C) 2008-2019 by Harald Welte <laforge@gnumonks.org>
* (C) 2009-2012 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2012 by Holger Hans Peter Freyther
* All Rights Reserved
*
* 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.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <inttypes.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/gsm23003.h>
#include <osmocom/gsm/abis_nm.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/gsm_data.h>
#include <osmo-bts/pcu_if.h>
#include <osmo-bts/pcuif_proto.h>
#include <osmo-bts/bts.h>
#include <osmo-bts/rsl.h>
#include <osmo-bts/signal.h>
#include <osmo-bts/l1sap.h>
#include <osmo-bts/oml.h>
#include <osmo-bts/abis_osmo.h>
uint32_t trx_get_hlayer1(const struct gsm_bts_trx *trx);
extern struct gsm_network bts_gsmnet;
int pcu_direct = 0;
static int avail_lai = 0, avail_nse = 0, avail_cell = 0, avail_nsvc[2] = {0, 0};
static const char *sapi_string[] = {
[PCU_IF_SAPI_RACH] = "RACH",
[PCU_IF_SAPI_AGCH] = "AGCH",
[PCU_IF_SAPI_PCH] = "PCH",
[PCU_IF_SAPI_BCCH] = "BCCH",
[PCU_IF_SAPI_PDTCH] = "PDTCH",
[PCU_IF_SAPI_PRACH] = "PRACH",
[PCU_IF_SAPI_PTCCH] = "PTCCH",
};
/*
* PCU messages
*/
struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx");
if (!msg)
return NULL;
msgb_put(msg, sizeof(struct gsm_pcu_if));
pcu_prim = (struct gsm_pcu_if *) msg->data;
pcu_prim->msg_type = msg_type;
pcu_prim->bts_nr = bts_nr;
return msg;
}
static bool ts_should_be_pdch(const struct gsm_bts_trx_ts *ts)
{
switch (ts->pchan) {
case GSM_PCHAN_PDCH:
return true;
case GSM_PCHAN_TCH_F_PDCH:
/* When we're busy deactivating the PDCH, we first set
* DEACT_PENDING, tell the PCU about it and wait for a
* response. So DEACT_PENDING means "no PDCH" to the PCU.
* Similarly, when we're activating PDCH, we set the
* ACT_PENDING and wait for an activation response from the
* PCU, so ACT_PENDING means "is PDCH". */
if (ts->flags & TS_F_PDCH_ACTIVE)
return !(ts->flags & TS_F_PDCH_DEACT_PENDING);
else
return (ts->flags & TS_F_PDCH_ACT_PENDING);
case GSM_PCHAN_OSMO_DYN:
/*
* When we're busy de-/activating the PDCH, we first set
* ts->dyn.pchan_want, tell the PCU about it and wait for a
* response. To make it available to PCU, we want to make sure
* it's already configured by phy (pchan_is==PDCH) and that we
* are not in progress of removing it (pchan_want=None).
*/
return ts->dyn.pchan_is == GSM_PCHAN_PDCH && ts->dyn.pchan_want == GSM_PCHAN_PDCH;
default:
return false;
}
}
/* As a BTS, we do not (and neither need to) know the Mobile Allocation, because
* in CS domain it's responsibility of the BSC to encode RR messages containing
* this IE. However, a BTS co-located PCU needs to know all hopping parameters,
* including the Mobile Allocation, because it's responsible for encoding of the
* packet resource assignment messages.
*
* This function, similar to generate_ma_for_ts() in osmo-bsc, computes the
* Mobile Allocation bit-mask and populates the given part of INFO.ind with
* the hopping parameters for the given timeslot. */
static void info_ind_fill_fhp(struct gsm_pcu_if_info_trx_ts *ts_info,
const struct gsm_bts_trx_ts *ts)
{
const struct gsm_bts *bts = ts->trx->bts;
const struct gsm_bts_trx *trx;
uint8_t ca_buf[1024 / 8] = { 0 };
uint8_t sa_buf[1024 / 8] = { 0 };
struct bitvec ca, sa, ma;
unsigned int i;
ts_info->maio = ts->hopping.maio;
ts_info->hsn = ts->hopping.hsn;
ts_info->hopping = 0x01;
/* Cell Allocation bit-mask */
ca = (struct bitvec) {
.data_len = sizeof(ca_buf),
.data = &ca_buf[0],
};
llist_for_each_entry(trx, &bts->trx_list, list) {
/* Skip non-provisioned transceivers */
if (trx->mo.nm_attr == NULL) {
LOGPTRX(trx, DPCU, LOGL_NOTICE, "not (yet) provisioned\n");
continue;
}
bitvec_set_bit_pos(&ca, trx->arfcn, ONE);
ts_info->ma_bit_len++;
}
/* Slot Allocation bit-mask */
sa = (struct bitvec) {
.data_len = sizeof(sa_buf),
.data = &sa_buf[0],
};
for (i = 0; i < ts->hopping.arfcn_num; i++) {
bitvec_set_bit_pos(&sa, ts->hopping.arfcn_list[i], ONE);
if (bitvec_get_bit_pos(&ca, ts->hopping.arfcn_list[i]) != ONE) {
LOGP(DPCU, LOGL_NOTICE, "A transceiver with ARFCN %u "
"is not (yet) provisioned\n", ts->hopping.arfcn_list[i]);
bitvec_set_bit_pos(&ca, ts->hopping.arfcn_list[i], ONE);
ts_info->ma_bit_len++;
}
}
/* Mobile Allocation bit-mask */
ma = (struct bitvec) {
.cur_bit = sizeof(ts_info->ma) * 8 - 1,
.data_len = sizeof(ts_info->ma),
.data = &ts_info->ma[0],
};
/* Skip ARFCN 0, it goes to the end of MA bit-mask */
for (i = 1; i < sizeof(ca_buf) * 8; i++) {
if (bitvec_get_bit_pos(&ca, i) != ONE)
continue;
if (bitvec_get_bit_pos(&sa, i) == ONE)
bitvec_set_bit_pos(&ma, ma.cur_bit, ONE);
ma.cur_bit--;
}
if (bitvec_get_bit_pos(&sa, 0) == ONE)
bitvec_set_bit_pos(&ma, ma.cur_bit, ONE);
}
static void info_ind_fill_trx(struct gsm_pcu_if_info_trx *trx_info,
const struct gsm_bts_trx *trx)
{
unsigned int tn;
trx_info->pdch_mask = 0;
trx_info->arfcn = trx->arfcn;
trx_info->hlayer1 = trx_get_hlayer1(trx);
if (trx->mo.nm_state.operational != NM_OPSTATE_ENABLED ||
trx->mo.nm_state.administrative != NM_STATE_UNLOCKED) {
LOGPTRX(trx, DPCU, LOGL_INFO, "unavailable for PCU (op=%s adm=%s)\n",
abis_nm_opstate_name(trx->mo.nm_state.operational),
abis_nm_admin_name(trx->mo.nm_state.administrative));
return;
}
for (tn = 0; tn < ARRAY_SIZE(trx->ts); tn++) {
const struct gsm_bts_trx_ts *ts = &trx->ts[tn];
if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED)
continue;
if (!ts_should_be_pdch(ts))
continue;
trx_info->pdch_mask |= (1 << tn);
trx_info->ts[tn].tsc = ts->tsc;
if (ts->hopping.enabled)
info_ind_fill_fhp(&trx_info->ts[tn], ts);
LOGPTRX(trx, DPCU, LOGL_INFO, "PDCH on ts=%u is available "
"(tsc=%u ", ts->nr, trx_info->ts[tn].tsc);
if (ts->hopping.enabled) {
LOGPC(DPCU, LOGL_INFO, "hopping=yes hsn=%u maio=%u ma_bit_len=%u)\n",
ts->hopping.hsn, ts->hopping.maio, trx_info->ts[tn].ma_bit_len);
} else {
LOGPC(DPCU, LOGL_INFO, "hopping=no arfcn=%u)\n", trx->arfcn);
}
}
}
int pcu_tx_info_ind(void)
{
struct gsm_network *net = &bts_gsmnet;
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_info_ind *info_ind;
struct gsm_bts *bts;
struct gprs_rlc_cfg *rlcc;
struct gsm_bts_trx *trx;
int i;
LOGP(DPCU, LOGL_INFO, "Sending info\n");
/* FIXME: allow multiple BTS */
bts = llist_entry(net->bts_list.next, struct gsm_bts, list);
rlcc = &bts->gprs.cell.rlc_cfg;
msg = pcu_msgb_alloc(PCU_IF_MSG_INFO_IND, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
info_ind = &pcu_prim->u.info_ind;
info_ind->version = PCU_IF_VERSION;
if (avail_lai && avail_nse && avail_cell && avail_nsvc[0]) {
info_ind->flags |= PCU_IF_FLAG_ACTIVE;
LOGP(DPCU, LOGL_INFO, "BTS is up\n");
} else
LOGP(DPCU, LOGL_INFO, "BTS is down\n");
if (pcu_direct)
info_ind->flags |= PCU_IF_FLAG_SYSMO;
info_ind->bsic = bts->bsic;
/* RAI */
info_ind->mcc = net->plmn.mcc;
info_ind->mnc = net->plmn.mnc;
info_ind->mnc_3_digits = net->plmn.mnc_3_digits;
info_ind->lac = bts->location_area_code;
info_ind->rac = bts->gprs.rac;
/* NSE */
info_ind->nsei = bts->gprs.nse.nsei;
memcpy(info_ind->nse_timer, bts->gprs.nse.timer, 7);
memcpy(info_ind->cell_timer, bts->gprs.cell.timer, 11);
/* cell attributes */
info_ind->cell_id = bts->cell_identity;
info_ind->repeat_time = rlcc->paging.repeat_time;
info_ind->repeat_count = rlcc->paging.repeat_count;
info_ind->bvci = bts->gprs.cell.bvci;
info_ind->t3142 = rlcc->parameter[RLC_T3142];
info_ind->t3169 = rlcc->parameter[RLC_T3169];
info_ind->t3191 = rlcc->parameter[RLC_T3191];
info_ind->t3193_10ms = rlcc->parameter[RLC_T3193];
info_ind->t3195 = rlcc->parameter[RLC_T3195];
info_ind->n3101 = rlcc->parameter[RLC_N3101];
info_ind->n3103 = rlcc->parameter[RLC_N3103];
info_ind->n3105 = rlcc->parameter[RLC_N3105];
info_ind->cv_countdown = rlcc->parameter[CV_COUNTDOWN];
if (rlcc->cs_mask & (1 << GPRS_CS1))
info_ind->flags |= PCU_IF_FLAG_CS1;
if (rlcc->cs_mask & (1 << GPRS_CS2))
info_ind->flags |= PCU_IF_FLAG_CS2;
if (rlcc->cs_mask & (1 << GPRS_CS3))
info_ind->flags |= PCU_IF_FLAG_CS3;
if (rlcc->cs_mask & (1 << GPRS_CS4))
info_ind->flags |= PCU_IF_FLAG_CS4;
if (rlcc->cs_mask & (1 << GPRS_MCS1))
info_ind->flags |= PCU_IF_FLAG_MCS1;
if (rlcc->cs_mask & (1 << GPRS_MCS2))
info_ind->flags |= PCU_IF_FLAG_MCS2;
if (rlcc->cs_mask & (1 << GPRS_MCS3))
info_ind->flags |= PCU_IF_FLAG_MCS3;
if (rlcc->cs_mask & (1 << GPRS_MCS4))
info_ind->flags |= PCU_IF_FLAG_MCS4;
if (rlcc->cs_mask & (1 << GPRS_MCS5))
info_ind->flags |= PCU_IF_FLAG_MCS5;
if (rlcc->cs_mask & (1 << GPRS_MCS6))
info_ind->flags |= PCU_IF_FLAG_MCS6;
if (rlcc->cs_mask & (1 << GPRS_MCS7))
info_ind->flags |= PCU_IF_FLAG_MCS7;
if (rlcc->cs_mask & (1 << GPRS_MCS8))
info_ind->flags |= PCU_IF_FLAG_MCS8;
if (rlcc->cs_mask & (1 << GPRS_MCS9))
info_ind->flags |= PCU_IF_FLAG_MCS9;
/* FIXME: isn't dl_tbf_ext wrong?: * 10 and no ntohs */
info_ind->dl_tbf_ext = rlcc->parameter[T_DL_TBF_EXT];
/* FIXME: isn't ul_tbf_ext wrong?: * 10 and no ntohs */
info_ind->ul_tbf_ext = rlcc->parameter[T_UL_TBF_EXT];
info_ind->initial_cs = rlcc->initial_cs;
info_ind->initial_mcs = rlcc->initial_mcs;
/* NSVC */
for (i = 0; i < ARRAY_SIZE(bts->gprs.nsvc); i++) {
const struct gsm_bts_gprs_nsvc *nsvc = &bts->gprs.nsvc[i];
info_ind->nsvci[i] = nsvc->nsvci;
/* PCUIF beauty: the NSVC addresses are sent in the network byte order,
* while the port numbers need to be send in the host order. Sigh. */
info_ind->local_port[i] = ntohs(nsvc->local.u.sin.sin_port);
info_ind->remote_port[i] = ntohs(nsvc->remote.u.sin.sin_port);
switch (nsvc->remote.u.sas.ss_family) {
case AF_INET:
info_ind->address_type[i] = PCU_IF_ADDR_TYPE_IPV4;
info_ind->remote_ip[i].v4 = nsvc->remote.u.sin.sin_addr;
break;
case AF_INET6:
info_ind->address_type[i] = PCU_IF_ADDR_TYPE_IPV6;
info_ind->remote_ip[i].v6 = nsvc->remote.u.sin6.sin6_addr;
break;
default:
info_ind->address_type[i] = PCU_IF_ADDR_TYPE_UNSPEC;
break;
}
}
llist_for_each_entry(trx, &bts->trx_list, list) {
if (trx->nr >= ARRAY_SIZE(info_ind->trx)) {
LOGPTRX(trx, DPCU, LOGL_NOTICE, "PCU interface (version %u) "
"cannot handle more than %zu transceivers => skipped\n",
PCU_IF_VERSION, ARRAY_SIZE(info_ind->trx));
continue;
}
info_ind_fill_trx(&info_ind->trx[trx->nr], trx);
}
return pcu_sock_send(net, msg);
}
static int pcu_if_signal_cb(unsigned int subsys, unsigned int signal,
void *hdlr_data, void *signal_data)
{
struct gsm_network *net = &bts_gsmnet;
struct gsm_bts_gprs_nsvc *nsvc;
struct gsm_bts *bts;
struct gsm48_system_information_type_3 *si3;
int id;
if (subsys != SS_GLOBAL)
return -EINVAL;
switch(signal) {
case S_NEW_SYSINFO:
bts = signal_data;
if (!(bts->si_valid & (1 << SYSINFO_TYPE_3)))
break;
si3 = (struct gsm48_system_information_type_3 *)
bts->si_buf[SYSINFO_TYPE_3];
osmo_plmn_from_bcd(si3->lai.digits, &net->plmn);
bts->location_area_code = ntohs(si3->lai.lac);
bts->cell_identity = ntohs(si3->cell_identity);
avail_lai = 1;
break;
case S_NEW_NSE_ATTR:
bts = signal_data;
avail_nse = 1;
break;
case S_NEW_CELL_ATTR:
bts = signal_data;
avail_cell = 1;
break;
case S_NEW_NSVC_ATTR:
nsvc = signal_data;
id = nsvc->id;
if (id < 0 || id > 1)
return -EINVAL;
avail_nsvc[id] = 1;
break;
case S_NEW_OP_STATE:
break;
default:
return -EINVAL;
}
/* Do not send INFO.ind if PCU is not connected */
if (!pcu_connected())
return 0;
/* If all infos have been received, of if one info is updated after
* all infos have been received, transmit info update. */
if (avail_lai && avail_nse && avail_cell && avail_nsvc[0])
pcu_tx_info_ind();
return 0;
}
int pcu_tx_app_info_req(struct gsm_bts *bts, uint8_t app_type, uint8_t len, const uint8_t *app_data)
{
struct gsm_pcu_if_app_info_req *ai_req;
struct gsm_pcu_if *pcu_prim;
struct msgb *msg;
if (app_type & 0xF0 || len > sizeof(ai_req->data))
return -EINVAL;
msg = pcu_msgb_alloc(PCU_IF_MSG_APP_INFO_REQ, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
ai_req = &pcu_prim->u.app_info_req;
ai_req->application_type = app_type;
ai_req->len = len;
memcpy(ai_req->data, app_data, ai_req->len);
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_rts_req(struct gsm_bts_trx_ts *ts, uint8_t is_ptcch, uint32_t fn,
uint16_t arfcn, uint8_t block_nr)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_rts_req *rts_req;
struct gsm_bts *bts = ts->trx->bts;
LOGP(DPCU, LOGL_DEBUG, "Sending rts request: is_ptcch=%d arfcn=%d "
"block=%d\n", is_ptcch, arfcn, block_nr);
msg = pcu_msgb_alloc(PCU_IF_MSG_RTS_REQ, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
rts_req = &pcu_prim->u.rts_req;
rts_req->sapi = (is_ptcch) ? PCU_IF_SAPI_PTCCH : PCU_IF_SAPI_PDTCH;
rts_req->fn = fn;
rts_req->arfcn = arfcn;
rts_req->trx_nr = ts->trx->nr;
rts_req->ts_nr = ts->nr;
rts_req->block_nr = block_nr;
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_data_ind(struct gsm_bts_trx_ts *ts, uint8_t sapi, uint32_t fn,
uint16_t arfcn, uint8_t block_nr, uint8_t *data, uint8_t len,
int8_t rssi, uint16_t ber10k, int16_t bto, int16_t lqual)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_data *data_ind;
struct gsm_bts *bts = ts->trx->bts;
LOGP(DPCU, LOGL_DEBUG, "Sending data indication: sapi=%s arfcn=%d block=%d data=%s\n",
sapi_string[sapi], arfcn, block_nr, osmo_hexdump(data, len));
msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_IND, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
data_ind = &pcu_prim->u.data_ind;
data_ind->sapi = sapi;
data_ind->rssi = rssi;
data_ind->fn = fn;
data_ind->arfcn = arfcn;
data_ind->trx_nr = ts->trx->nr;
data_ind->ts_nr = ts->nr;
data_ind->block_nr = block_nr;
data_ind->ber10k = ber10k;
data_ind->ta_offs_qbits = bto;
data_ind->lqual_cb = lqual;
if (len)
memcpy(data_ind->data, data, len);
data_ind->len = len;
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_rach_ind(uint8_t bts_nr, uint8_t trx_nr, uint8_t ts_nr,
int16_t qta, uint16_t ra, uint32_t fn, uint8_t is_11bit,
enum ph_burst_type burst_type, uint8_t sapi)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_rach_ind *rach_ind;
LOGP(DPCU, LOGL_INFO, "Sending RACH indication: qta=%d, ra=%d, "
"fn=%d\n", qta, ra, fn);
msg = pcu_msgb_alloc(PCU_IF_MSG_RACH_IND, bts_nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
rach_ind = &pcu_prim->u.rach_ind;
rach_ind->sapi = sapi;
rach_ind->ra = ra;
rach_ind->qta = qta;
rach_ind->fn = fn;
rach_ind->is_11bit = is_11bit;
rach_ind->burst_type = burst_type;
rach_ind->trx_nr = trx_nr;
rach_ind->ts_nr = ts_nr;
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_time_ind(uint32_t fn)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_time_ind *time_ind;
uint8_t fn13 = fn % 13;
/* omit frame numbers not starting at a MAC block */
if (fn13 != 0 && fn13 != 4 && fn13 != 8)
return 0;
msg = pcu_msgb_alloc(PCU_IF_MSG_TIME_IND, 0);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
time_ind = &pcu_prim->u.time_ind;
time_ind->fn = fn;
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_interf_ind(const struct gsm_bts_trx *trx, uint32_t fn)
{
struct gsm_pcu_if_interf_ind *interf_ind;
struct gsm_pcu_if *pcu_prim;
struct msgb *msg;
unsigned int tn;
msg = pcu_msgb_alloc(PCU_IF_MSG_INTERF_IND, trx->bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
interf_ind = &pcu_prim->u.interf_ind;
interf_ind->trx_nr = trx->nr;
interf_ind->fn = fn;
for (tn = 0; tn < ARRAY_SIZE(trx->ts); tn++) {
const struct gsm_bts_trx_ts *ts = &trx->ts[tn];
const struct gsm_lchan *lchan = &ts->lchan[0];
if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED)
continue;
if (ts->mo.nm_state.availability != NM_AVSTATE_OK)
continue;
if (ts_pchan(ts) != GSM_PCHAN_PDCH)
continue;
interf_ind->interf[tn] = -1 * lchan->meas.interf_meas_avg_dbm;
}
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_pag_req(const uint8_t *identity_lv, uint8_t chan_needed)
{
struct pcu_sock_state *state = bts_gsmnet.pcu_state;
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_pag_req *pag_req;
/* check if identity does not fit: length > sizeof(lv) - 1 */
if (identity_lv[0] >= sizeof(pag_req->identity_lv)) {
LOGP(DPCU, LOGL_ERROR, "Paging identity too large (%d)\n",
identity_lv[0]);
return -EINVAL;
}
/* socket not created */
if (!state) {
LOGP(DPCU, LOGL_DEBUG, "PCU socket not created, ignoring "
"paging message\n");
return 0;
}
msg = pcu_msgb_alloc(PCU_IF_MSG_PAG_REQ, 0);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
pag_req = &pcu_prim->u.pag_req;
pag_req->chan_needed = chan_needed;
memcpy(pag_req->identity_lv, identity_lv, identity_lv[0] + 1);
return pcu_sock_send(&bts_gsmnet, msg);
}
int pcu_tx_pch_data_cnf(uint32_t fn, uint8_t *data, uint8_t len)
{
struct gsm_network *net = &bts_gsmnet;
struct gsm_bts *bts;
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_data *data_cnf;
/* FIXME: allow multiple BTS */
bts = llist_entry(net->bts_list.next, struct gsm_bts, list);
LOGP(DPCU, LOGL_DEBUG, "Sending PCH confirm\n");
msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_CNF, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
data_cnf = &pcu_prim->u.data_cnf;
data_cnf->sapi = PCU_IF_SAPI_PCH;
data_cnf->fn = fn;
memcpy(data_cnf->data, data, len);
data_cnf->len = len;
return pcu_sock_send(&bts_gsmnet, msg);
}
/* forward data from a RR GPRS SUSPEND REQ towards PCU */
int pcu_tx_susp_req(struct gsm_lchan *lchan, uint32_t tlli, const uint8_t *ra_id, uint8_t cause)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
msg = pcu_msgb_alloc(PCU_IF_MSG_SUSP_REQ, lchan->ts->trx->bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
pcu_prim->u.susp_req.tlli = tlli;
memcpy(pcu_prim->u.susp_req.ra_id, ra_id, sizeof(pcu_prim->u.susp_req.ra_id));
pcu_prim->u.susp_req.cause = cause;
return pcu_sock_send(&bts_gsmnet, msg);
}
static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
const struct gsm_pcu_if_data *data_req)
{
uint8_t is_ptcch;
struct gsm_bts_trx *trx;
struct gsm_bts_trx_ts *ts;
struct msgb *msg;
int rc = 0;
LOGP(DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d "
"block=%d data=%s\n", sapi_string[data_req->sapi],
data_req->arfcn, data_req->block_nr,
osmo_hexdump(data_req->data, data_req->len));
switch (data_req->sapi) {
case PCU_IF_SAPI_PCH:
paging_add_imm_ass(bts->paging_state, data_req->data, data_req->len);
break;
case PCU_IF_SAPI_AGCH:
msg = msgb_alloc(data_req->len, "pcu_agch");
if (!msg) {
rc = -ENOMEM;
break;
}
msg->l3h = msgb_put(msg, data_req->len);
memcpy(msg->l3h, data_req->data, data_req->len);
if (bts_agch_enqueue(bts, msg) < 0) {
msgb_free(msg);
rc = -EIO;
}
break;
case PCU_IF_SAPI_PDTCH:
case PCU_IF_SAPI_PTCCH:
trx = gsm_bts_trx_num(bts, data_req->trx_nr);
if (!trx) {
LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
"not existing TRX %d\n", data_req->trx_nr);
rc = -EINVAL;
break;
}
if (data_req->ts_nr >= ARRAY_SIZE(trx->ts)) {
LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
"not existing TS %u\n", data_req->ts_nr);
rc = -EINVAL;
break;
}
ts = &trx->ts[data_req->ts_nr];
if (!ts_should_be_pdch(ts)) {
LOGP(DPCU, LOGL_ERROR, "%s: Received PCU DATA request for non-PDCH TS\n",
gsm_ts_name(ts));
rc = -EINVAL;
break;
}
if (ts->lchan[0].state != LCHAN_S_ACTIVE) {
LOGP(DPCU, LOGL_ERROR, "%s: Received PCU DATA request for inactive lchan\n",
gsm_ts_name(ts));
rc = -EINVAL;
break;
}
is_ptcch = (data_req->sapi == PCU_IF_SAPI_PTCCH);
rc = l1sap_pdch_req(ts, is_ptcch, data_req->fn, data_req->arfcn,
data_req->block_nr, data_req->data, data_req->len);
break;
default:
LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
"unsupported sapi %d\n", data_req->sapi);
rc = -EINVAL;
}
return rc;
}
static int pcu_rx_pag_req(struct gsm_bts *bts, uint8_t msg_type,
const struct gsm_pcu_if_pag_req *pag_req)
{
int rc = 0;
OSMO_ASSERT(msg_type == PCU_IF_MSG_PAG_REQ);
/* FIXME: Add function to schedule paging request.
* At present, osmo-pcu sends paging requests in PCU_IF_MSG_DATA_REQ
* messages which are processed by pcu_rx_data_req().
* This code path is not triggered in practice. */
LOGP(DPCU, LOGL_NOTICE, "Paging request received: chan_needed=%d length=%d "
"(dropping message because support for PCU_IF_MSG_PAG_REQ is not yet implemented)\n",
pag_req->chan_needed, pag_req->identity_lv[0]);
return rc;
}
int pcu_tx_si(const struct gsm_bts *bts, enum osmo_sysinfo_type si_type,
bool enable)
{
/* the SI is per-BTS so it doesn't matter which TRX we use */
struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, 0);
uint8_t si_buf[GSM_MACBLOCK_LEN];
uint8_t len;
int rc;
if (enable) {
memcpy(si_buf, GSM_BTS_SI(bts, si_type), GSM_MACBLOCK_LEN);
len = GSM_MACBLOCK_LEN;
LOGP(DPCU, LOGL_DEBUG, "Updating SI%s to PCU: %s\n",
get_value_string(osmo_sitype_strs, si_type),
osmo_hexdump_nospc(si_buf, GSM_MACBLOCK_LEN));
} else {
si_buf[0] = si_type;
len = 1;
/* Note: SI13 is the only system information type that is revked
* by just sending a completely empty message. This is due to
* historical reasons */
if (si_type != SYSINFO_TYPE_13)
len = 0;
LOGP(DPCU, LOGL_DEBUG, "Revoking SI%s from PCU\n",
get_value_string(osmo_sitype_strs, si_buf[0]));
}
/* The low-level data like FN, ARFCN etc will be ignored but we have to
* set lqual high enough to bypass the check at lower levels */
rc = pcu_tx_data_ind(&trx->ts[0], PCU_IF_SAPI_BCCH, 0, 0, 0, si_buf, len,
0, 0, 0, INT16_MAX);
if (rc < 0)
LOGP(DPCU, LOGL_NOTICE, "Failed to send SI%s to PCU: rc=%d\n",
get_value_string(osmo_sitype_strs, si_type), rc);
return rc;
}
static int pcu_tx_si_all(struct gsm_bts *bts)
{
const enum osmo_sysinfo_type si_types[] =
{ SYSINFO_TYPE_1, SYSINFO_TYPE_2, SYSINFO_TYPE_3, SYSINFO_TYPE_13 };
unsigned int i;
int rc = 0;
for (i = 0; i < ARRAY_SIZE(si_types); i++) {
if (GSM_BTS_HAS_SI(bts, si_types[i])) {
rc = pcu_tx_si(bts, si_types[i], true);
if (rc < 0)
return rc;
} else {
LOGP(DPCU, LOGL_INFO,
"SI%s is not available on PCU connection\n",
get_value_string(osmo_sitype_strs, si_types[i]));
}
}
return 0;
}
static int pcu_rx_txt_ind(struct gsm_bts *bts,
struct gsm_pcu_if_txt_ind *txt)
{
int rc;
switch (txt->type) {
case PCU_VERSION:
LOGP(DPCU, LOGL_INFO, "OsmoPCU version %s connected\n",
txt->text);
oml_tx_failure_event_rep(&bts->gprs.cell.mo, NM_SEVER_CEASED, OSMO_EVT_PCU_VERS, txt->text);
osmo_strlcpy(bts->pcu_version, txt->text, MAX_VERSION_LENGTH);
/* patch SI to advertise GPRS, *if* the SI sent by BSC said so */
regenerate_si3_restoctets(bts);
regenerate_si4_restoctets(bts);
rc = pcu_tx_si_all(bts);
if (rc < 0)
return -EINVAL;
break;
case PCU_OML_ALERT:
oml_tx_failure_event_rep(&bts->gprs.cell.mo, NM_SEVER_INDETERMINATE, OSMO_EVT_EXT_ALARM,
txt->text);
break;
default:
LOGP(DPCU, LOGL_ERROR, "Unknown TXT_IND type %u received\n",
txt->type);
return -EINVAL;
}
return 0;
}
static int pcu_rx_act_req(struct gsm_bts *bts,
const struct gsm_pcu_if_act_req *act_req)
{
struct gsm_bts_trx *trx;
struct gsm_lchan *lchan;
LOGP(DPCU, LOGL_INFO, "%s request received: TRX=%d TS=%d\n",
(act_req->activate) ? "Activate" : "Deactivate",
act_req->trx_nr, act_req->ts_nr);
trx = gsm_bts_trx_num(bts, act_req->trx_nr);
if (!trx || act_req->ts_nr >= 8)
return -EINVAL;
lchan = trx->ts[act_req->ts_nr].lchan;
lchan->rel_act_kind = LCHAN_REL_ACT_PCU;
if (lchan->type != GSM_LCHAN_PDTCH) {
LOGP(DPCU, LOGL_ERROR,
"%s request, but lchan is not of type PDTCH (is %s)\n",
(act_req->activate) ? "Activate" : "Deactivate",
gsm_lchant_name(lchan->type));
return -EINVAL;
}
if (lchan->ts->pchan == GSM_PCHAN_OSMO_DYN &&
lchan->ts->dyn.pchan_is != GSM_PCHAN_PDCH) {
LOGP(DPCU, LOGL_ERROR,
"%s request, but lchan in dyn TS is not configured as PDCH in lower layers (is %s)\n",
(act_req->activate) ? "Activate" : "Deactivate",
gsm_pchan_name(lchan->ts->dyn.pchan_is));
return -EINVAL;
}
if (act_req->activate)
l1sap_chan_act(trx, gsm_lchan2chan_nr(lchan));
else
l1sap_chan_rel(trx, gsm_lchan2chan_nr(lchan));
return 0;
}
#define CHECK_IF_MSG_SIZE(prim_len, prim_msg) \
do { \
size_t _len = PCUIF_HDR_SIZE + sizeof(prim_msg); \
if (prim_len < _len) { \
LOGP(DPCU, LOGL_ERROR, "Received %zu bytes on PCU Socket, but primitive %s " \
"size is %zu, discarding\n", prim_len, #prim_msg, _len); \
return -EINVAL; \
} \
} while (0)
static int pcu_rx(struct gsm_network *net, uint8_t msg_type,
struct gsm_pcu_if *pcu_prim, size_t prim_len)
{
int rc = 0;
struct gsm_bts *bts;
size_t exp_len;
if ((bts = gsm_bts_num(net, pcu_prim->bts_nr)) == NULL) {
LOGP(DPCU, LOGL_ERROR, "Received PCU Prim for non-existent BTS %u\n", pcu_prim->bts_nr);
return -EINVAL;
}
switch (msg_type) {
case PCU_IF_MSG_DATA_REQ:
CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.data_req);
rc = pcu_rx_data_req(bts, msg_type, &pcu_prim->u.data_req);
break;
case PCU_IF_MSG_PAG_REQ:
CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.pag_req);
rc = pcu_rx_pag_req(bts, msg_type, &pcu_prim->u.pag_req);
break;
case PCU_IF_MSG_ACT_REQ:
CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.act_req);
rc = pcu_rx_act_req(bts, &pcu_prim->u.act_req);
break;
case PCU_IF_MSG_TXT_IND:
CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.txt_ind);
rc = pcu_rx_txt_ind(bts, &pcu_prim->u.txt_ind);
break;
case PCU_IF_MSG_CONTAINER:
CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.container);
/* ^ check if we can access container fields, v check with container data length */
exp_len = PCUIF_HDR_SIZE + sizeof(pcu_prim->u.container) + osmo_load16be(&pcu_prim->u.container.length);
if (prim_len < exp_len) {
LOGP(DPCU, LOGL_ERROR, "Received %zu bytes on PCU Socket, but primitive "
"container size is %zu, discarding\n", prim_len, exp_len);
return -EINVAL;
}
rc = abis_osmo_pcu_tx_container(bts, &pcu_prim->u.container);
break;
default:
LOGP(DPCU, LOGL_ERROR, "Received unknown PCU msg type %d\n",
msg_type);
rc = -EINVAL;
}
return rc;
}
/*
* PCU socket interface
*/
struct pcu_sock_state {
struct gsm_network *net;
struct osmo_fd listen_bfd; /* fd for listen socket */
struct osmo_fd conn_bfd; /* fd for connection to lcr */
struct llist_head upqueue; /* queue for sending messages */
};
int pcu_sock_send(struct gsm_network *net, struct msgb *msg)
{
struct pcu_sock_state *state = net->pcu_state;
struct osmo_fd *conn_bfd;
struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msg->data;
if (!state) {
if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND &&
pcu_prim->msg_type != PCU_IF_MSG_INTERF_IND)
LOGP(DPCU, LOGL_INFO, "PCU socket not created, "
"dropping message\n");
msgb_free(msg);
return -EINVAL;
}
conn_bfd = &state->conn_bfd;
if (conn_bfd->fd <= 0) {
if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND &&
pcu_prim->msg_type != PCU_IF_MSG_INTERF_IND)
LOGP(DPCU, LOGL_NOTICE, "PCU socket not connected, "
"dropping message\n");
msgb_free(msg);
return -EIO;
}
msgb_enqueue(&state->upqueue, msg);
osmo_fd_write_enable(conn_bfd);
return 0;
}
static void pcu_sock_close(struct pcu_sock_state *state)
{
struct osmo_fd *bfd = &state->conn_bfd;
struct gsm_bts *bts;
struct gsm_bts_trx *trx;
unsigned int tn;
/* FIXME: allow multiple BTS */
bts = llist_entry(state->net->bts_list.next, struct gsm_bts, list);
LOGP(DPCU, LOGL_NOTICE, "PCU socket has LOST connection\n");
oml_tx_failure_event_rep(&bts->gprs.cell.mo, NM_SEVER_MAJOR, OSMO_EVT_PCU_VERS,
"PCU socket has LOST connection");
bts->pcu_version[0] = '\0';
osmo_fd_unregister(bfd);
close(bfd->fd);
bfd->fd = -1;
/* patch SI3 to remove GPRS indicator */
regenerate_si3_restoctets(bts);
regenerate_si4_restoctets(bts);
/* re-enable the generation of ACCEPT for new connections */
osmo_fd_read_enable(&state->listen_bfd);
#if 0
/* remove si13, ... */
bts->si_valid &= ~(1 << SYSINFO_TYPE_13);
osmo_signal_dispatch(SS_GLOBAL, S_NEW_SYSINFO, bts);
#endif
/* Deactivate all active PDCH timeslots */
llist_for_each_entry(trx, &bts->trx_list, list) {
for (tn = 0; tn < 8; tn++) {
struct gsm_bts_trx_ts *ts = &trx->ts[tn];
if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED)
continue;
if (!ts_should_be_pdch(ts))
continue;
ts->lchan[0].rel_act_kind = LCHAN_REL_ACT_PCU;
l1sap_chan_rel(trx, gsm_lchan2chan_nr(&ts->lchan[0]));
}
}
/* flush the queue */
while (!llist_empty(&state->upqueue)) {
struct msgb *msg = msgb_dequeue(&state->upqueue);
msgb_free(msg);
}
}
static int pcu_sock_read(struct osmo_fd *bfd)
{
struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
struct gsm_pcu_if *pcu_prim;
struct msgb *msg;
int rc;
msg = msgb_alloc(sizeof(*pcu_prim) + 1000, "pcu_sock_rx");
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->tail;
rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0);
if (rc == 0)
goto close;
if (rc < 0) {
if (errno == EAGAIN) {
msgb_free(msg);
return 0;
}
goto close;
}
if (rc < PCUIF_HDR_SIZE) {
LOGP(DPCU, LOGL_ERROR, "Received %d bytes on PCU Socket, but primitive hdr size "
"is %zu, discarding\n", rc, PCUIF_HDR_SIZE);
msgb_free(msg);
return 0;
}
rc = pcu_rx(state->net, pcu_prim->msg_type, pcu_prim, rc);
/* as we always synchronously process the message in pcu_rx() and
* its callbacks, we can free the message here. */
msgb_free(msg);
return rc;
close:
msgb_free(msg);
pcu_sock_close(state);
return -1;
}
static int pcu_sock_write(struct osmo_fd *bfd)
{
struct pcu_sock_state *state = bfd->data;
int rc;
while (!llist_empty(&state->upqueue)) {
struct msgb *msg, *msg2;
struct gsm_pcu_if *pcu_prim;
/* peek at the beginning of the queue */
msg = llist_entry(state->upqueue.next, struct msgb, list);
pcu_prim = (struct gsm_pcu_if *)msg->data;
osmo_fd_write_disable(bfd);
/* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
if (!msgb_length(msg)) {
LOGP(DPCU, LOGL_ERROR, "message type (%d) with ZERO "
"bytes!\n", pcu_prim->msg_type);
goto dontsend;
}
/* try to send it over the socket */
rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
if (rc == 0)
goto close;
if (rc < 0) {
if (errno == EAGAIN) {
osmo_fd_write_enable(bfd);
break;
}
goto close;
}
dontsend:
/* _after_ we send it, we can deueue */
msg2 = msgb_dequeue(&state->upqueue);
assert(msg == msg2);
msgb_free(msg);
}
return 0;
close:
pcu_sock_close(state);
return -1;
}
static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
{
int rc = 0;
if (flags & OSMO_FD_READ)
rc = pcu_sock_read(bfd);
if (rc < 0)
return rc;
if (flags & OSMO_FD_WRITE)
rc = pcu_sock_write(bfd);
return rc;
}
/* accept connection coming from PCU */
static int pcu_sock_accept(struct osmo_fd *bfd, unsigned int flags)
{
struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
struct osmo_fd *conn_bfd = &state->conn_bfd;
struct sockaddr_un un_addr;
socklen_t len;
int fd;
len = sizeof(un_addr);
fd = accept(bfd->fd, (struct sockaddr *)&un_addr, &len);
if (fd < 0) {
LOGP(DPCU, LOGL_ERROR, "Failed to accept a new connection\n");
return -1;
}
if (conn_bfd->fd >= 0) {
LOGP(DPCU, LOGL_NOTICE, "PCU connects but we already have another active connection ?!?\n");
/* We already have one PCU connected, this is all we support */
osmo_fd_read_disable(&state->listen_bfd);
close(fd);
return 0;
}
osmo_fd_setup(conn_bfd, fd, OSMO_FD_READ, pcu_sock_cb, state, 0);
if (osmo_fd_register(conn_bfd) != 0) {
LOGP(DPCU, LOGL_ERROR, "Failed to register new connection fd\n");
close(conn_bfd->fd);
conn_bfd->fd = -1;
return -1;
}
LOGP(DPCU, LOGL_NOTICE, "PCU socket connected to external PCU\n");
/* send current info */
pcu_tx_info_ind();
return 0;
}
int pcu_sock_init(const char *path)
{
struct pcu_sock_state *state;
struct osmo_fd *bfd;
int rc;
state = talloc_zero(NULL, struct pcu_sock_state);
if (!state)
return -ENOMEM;
INIT_LLIST_HEAD(&state->upqueue);
state->net = &bts_gsmnet;
state->conn_bfd.fd = -1;
bfd = &state->listen_bfd;
rc = osmo_sock_unix_init(SOCK_SEQPACKET, 0, path, OSMO_SOCK_F_BIND);
if (rc < 0) {
LOGP(DPCU, LOGL_ERROR, "Could not create %s unix socket: %s\n",
path, strerror(errno));
talloc_free(state);
return -1;
}
osmo_fd_setup(bfd, rc, OSMO_FD_READ, pcu_sock_accept, state, 0);
rc = osmo_fd_register(bfd);
if (rc < 0) {
LOGP(DPCU, LOGL_ERROR, "Could not register listen fd: %d\n",
rc);
close(bfd->fd);
talloc_free(state);
return rc;
}
osmo_signal_register_handler(SS_GLOBAL, pcu_if_signal_cb, NULL);
bts_gsmnet.pcu_state = state;
LOGP(DPCU, LOGL_INFO, "Started listening on PCU socket: %s\n", path);
return 0;
}
void pcu_sock_exit(void)
{
struct pcu_sock_state *state = bts_gsmnet.pcu_state;
struct osmo_fd *bfd, *conn_bfd;
if (!state)
return;
osmo_signal_unregister_handler(SS_GLOBAL, pcu_if_signal_cb, NULL);
conn_bfd = &state->conn_bfd;
if (conn_bfd->fd > 0)
pcu_sock_close(state);
bfd = &state->listen_bfd;
close(bfd->fd);
osmo_fd_unregister(bfd);
talloc_free(state);
bts_gsmnet.pcu_state = NULL;
}
bool pcu_connected(void) {
struct gsm_network *net = &bts_gsmnet;
struct pcu_sock_state *state = net->pcu_state;
if (!state)
return false;
if (state->conn_bfd.fd <= 0)
return false;
return true;
}
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