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osmocom-bb/src/host/layer23/src/mobile/gsm48_rr.c

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/*
* (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
*
* 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.
*
*/
/* Very short description of some of the procedures:
*
* A radio ressource request causes sendig a channel request on RACH.
* After receiving of an immediate assignment the link will be establised.
* After the link is established, the dedicated mode is entered and confirmed.
*
* A Paging request also triggers the channel request as above...
* After the link is established, the dedicated mode is entered and indicated.
*
* During dedicated mode, messages are transferred.
*
* When an assignment command or a handover command is received, the current
* link is released. After release, the new channel is activated and the
* link is established again. After link is establised, pending messages from
* radio ressource are sent.
*
* When the assignment or handover fails, the old channel is activate and the
* link is established again. Also pending messages are sent.
*
*/
/* Testing delayed (immediate) assignment / handover
*
* When enabled, the starting time will be set by given frames in the future.
* If a starting time is given by the network, this time is ignored.
*/
//#define TEST_STARTING_TIMER 140
/* Testing if frequency modification works correctly "after time".
*
* When enabled, the starting time will be set in the future.
* A wrong channel is defined "before time", so noise is received until
* starting time elapses.
* If a starting time is given by the network, this time is ignored.
* Also channel definitions "before time" are ignored.
*
* NOTE: TEST_STARTING_TIMER MUST be defined also.
*/
//#define TEST_FREQUENCY_MOD
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/rsl.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/codec/codec.h>
#include <osmocom/bb/common/osmocom_data.h>
#include <osmocom/bb/common/l1l2_interface.h>
#include <osmocom/bb/common/l23_app.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/common/networks.h>
#include <osmocom/bb/common/l1ctl.h>
#include <osmocom/bb/mobile/vty.h>
#include <osmocom/bb/common/utils.h>
#include <l1ctl_proto.h>
static void start_rr_t_meas(struct gsm48_rrlayer *rr, int sec, int micro);
static void stop_rr_t_starting(struct gsm48_rrlayer *rr);
static void stop_rr_t3124(struct gsm48_rrlayer *rr);
static int gsm48_rcv_rsl(struct osmocom_ms *ms, struct msgb *msg);
static int gsm48_rr_dl_est(struct osmocom_ms *ms);
static int gsm48_rr_tx_meas_rep(struct osmocom_ms *ms);
static int gsm48_rr_set_mode(struct osmocom_ms *ms, uint8_t chan_nr,
uint8_t mode);
static int gsm48_rr_rel_cnf(struct osmocom_ms *ms, struct msgb *msg);
int gsm414_rcv_test(struct osmocom_ms *ms, const struct msgb *msg);
/*
* support
*/
#define MIN(a, b) ((a < b) ? a : b)
/* decode "Power Command" (10.5.2.28) and (10.5.2.28a) */
static int gsm48_decode_power_cmd_acc(struct gsm48_power_cmd *pc,
uint8_t *power_level, uint8_t *atc)
{
*power_level = pc->power_level;
if (atc) /* only in case of 10.5.2.28a */
*atc = pc->atc;
return 0;
}
/* 10.5.2.38 decode Starting time IE */
static int gsm48_decode_start_time(struct gsm48_rr_cd *cd,
struct gsm48_start_time *st)
{
cd->start = 1;
cd->start_tm.t1 = st->t1;
cd->start_tm.t2 = st->t2;
cd->start_tm.t3 = (st->t3_high << 3) | st->t3_low;
cd->start_tm.fn = gsm_gsmtime2fn(&cd->start_tm);
return 0;
}
/* decode "BA Range" (10.5.2.1a) */
static int gsm48_decode_ba_range(const uint8_t *ba, uint8_t ba_len,
uint32_t *range, uint8_t *ranges, int max_ranges)
{
/* ba = pointer to IE without IE type and length octets
* ba_len = number of octets
* range = pointer to store decoded range
* ranges = number of ranges decoded
* max_ranges = maximum number of decoded ranges that can be stored
*/
uint16_t lower, higher;
int i, n, required_octets;
/* find out how much ba ranges will be decoded */
n = *ba++;
ba_len --;
required_octets = 5 * (n >> 1) + 3 * (n & 1);
if (required_octets > ba_len) {
LOGP(DRR, LOGL_NOTICE, "BA range IE too short: %d ranges "
"require %d octets, but only %d octets remain.\n",
n, required_octets, ba_len);
*ranges = 0;
return -EINVAL;
}
if (n > max_ranges) {
LOGP(DRR, LOGL_NOTICE, "BA range %d exceed the maximum number "
"of ranges supported by this mobile (%d).\n",
n, max_ranges);
n = max_ranges;
}
/* decode ranges */
for (i = 0; i < n; i++) {
if (!(i & 1)) {
/* decode even range number */
lower = *ba++ << 2;
lower |= (*ba >> 6);
higher = (*ba++ & 0x3f) << 4;
higher |= *ba >> 4;
} else {
lower = (*ba++ & 0x0f) << 6;
lower |= *ba >> 2;
higher = (*ba++ & 0x03) << 8;
higher |= *ba++;
/* decode odd range number */
}
*range++ = (higher << 16) | lower;
}
*ranges = n;
return 0;
}
/* decode "Cell Description" (10.5.2.2) */
static int gsm48_decode_cell_desc(struct gsm48_cell_desc *cd, uint16_t *arfcn,
uint8_t *ncc, uint8_t *bcc)
{
*arfcn = (cd->arfcn_hi << 8) + cd->arfcn_lo;
*ncc = cd->ncc;
*bcc = cd->bcc;
return 0;
}
/* decode "Synchronization Indication" (10.5.2.39) */
static int gsm48_decode_sync_ind(struct gsm48_rrlayer *rr,
struct gsm48_sync_ind *si)
{
rr->hando_sync_ind = si->si;
rr->hando_rot = si->rot;
rr->hando_nci = si->nci;
return 0;
}
/* 3.1.4.3 set sequence number and increment */
static int gsm48_apply_v_sd(struct gsm48_rrlayer *rr, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t pdisc = gh->proto_discr & 0x0f;
uint8_t v_sd;
switch (pdisc) {
case GSM48_PDISC_MM:
case GSM48_PDISC_CC:
case GSM48_PDISC_NC_SS:
/* all three pdiscs share the same V(SD) */
pdisc = GSM48_PDISC_MM;
// fall through
case GSM48_PDISC_GROUP_CC:
case GSM48_PDISC_BCAST_CC:
case GSM48_PDISC_PDSS1:
case GSM48_PDISC_PDSS2:
/* extract v_sd(pdisc) */
v_sd = (rr->v_sd >> pdisc) & 1;
/* replace bit 7 vy v_sd */
gh->msg_type &= 0xbf;
gh->msg_type |= (v_sd << 6);
/* increment V(SD) */
rr->v_sd ^= (1 << pdisc);
LOGP(DRR, LOGL_INFO, "Using and incrementing V(SD) = %d "
"(pdisc %x)\n", v_sd, pdisc);
break;
case GSM48_PDISC_RR:
case GSM48_PDISC_SMS:
/* no V(VSD) is required */
break;
default:
LOGP(DRR, LOGL_ERROR, "Error, V(SD) of pdisc %x not handled\n",
pdisc);
return -ENOTSUP;
}
return 0;
}
/* set channel mode if supported, or return error cause */
static uint8_t gsm48_rr_check_mode(struct osmocom_ms *ms, uint8_t chan_nr,
uint8_t mode)
{
struct gsm_settings *set = &ms->settings;
uint8_t ch_type, ch_subch, ch_ts;
/* only complain if we use TCH/F or TCH/H */
rsl_dec_chan_nr(chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ch_type != RSL_CHAN_Bm_ACCHs
&& ch_type != RSL_CHAN_Lm_ACCHs)
return 0;
switch (mode) {
case GSM48_CMODE_SIGN:
LOGP(DRR, LOGL_INFO, "Mode: signalling\n");
break;
case GSM48_CMODE_SPEECH_V1:
if (ch_type == RSL_CHAN_Bm_ACCHs) {
if (!set->full_v1) {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"full-rate speech V1\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
LOGP(DRR, LOGL_INFO, "Mode: full-rate speech V1\n");
} else {
if (!set->half_v1) {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"half-rate speech V1\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
LOGP(DRR, LOGL_INFO, "Mode: half-rate speech V1\n");
}
break;
case GSM48_CMODE_SPEECH_EFR:
if (ch_type == RSL_CHAN_Bm_ACCHs) {
if (!set->full_v2) {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"full-rate speech V2\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
LOGP(DRR, LOGL_INFO, "Mode: full-rate speech V2\n");
} else {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"half-rate speech V2\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
break;
case GSM48_CMODE_SPEECH_AMR:
if (ch_type == RSL_CHAN_Bm_ACCHs) {
if (!set->full_v3) {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"full-rate speech V3\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
LOGP(DRR, LOGL_INFO, "Mode: full-rate speech V3\n");
} else {
if (!set->half_v3) {
LOGP(DRR, LOGL_NOTICE, "Not supporting "
"half-rate speech V3\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
LOGP(DRR, LOGL_INFO, "Mode: half-rate speech V3\n");
}
break;
default:
LOGP(DRR, LOGL_ERROR, "Mode 0x%02x not supported!\n", mode);
return GSM48_RR_CAUSE_CHAN_MODE_UNACCT;
}
return 0;
}
/* apply new "alter_delay" in dedicated mode */
int gsm48_rr_alter_delay(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm_settings *set = &ms->settings;
if (rr->state != GSM48_RR_ST_DEDICATED)
return -EINVAL;
l1ctl_tx_param_req(ms, rr->cd_now.ind_ta - set->alter_delay,
(set->alter_tx_power) ? set->alter_tx_power_value
: rr->cd_now.ind_tx_power);
return 0;
}
/*
* state transition
*/
const char *gsm48_rr_state_names[] = {
"idle",
"connection pending",
"dedicated",
"release pending",
};
static void new_rr_state(struct gsm48_rrlayer *rr, int state)
{
if (state < 0 || state >=
(sizeof(gsm48_rr_state_names) / sizeof(char *)))
return;
/* must check against equal state */
if (rr->state == state) {
LOGP(DRR, LOGL_INFO, "equal state ? %s\n",
gsm48_rr_state_names[rr->state]);
return;
}
LOGP(DRR, LOGL_INFO, "new state %s -> %s\n",
gsm48_rr_state_names[rr->state], gsm48_rr_state_names[state]);
/* abort handover, in case of release of dedicated mode */
if (rr->state == GSM48_RR_ST_DEDICATED) {
/* disable handover / assign state */
rr->modify_state = GSM48_RR_MOD_NONE;
/* stop start_time_timer */
stop_rr_t_starting(rr);
/* stop handover timer */
stop_rr_t3124(rr);
}
rr->state = state;
if (state == GSM48_RR_ST_IDLE) {
struct msgb *msg, *nmsg;
struct gsm322_msg *em;
/* release dedicated mode, if any */
l1ctl_tx_dm_rel_req(rr->ms);
rr->ms->meas.rl_fail = 0;
rr->dm_est = 0;
l1ctl_tx_reset_req(rr->ms, L1CTL_RES_T_FULL);
/* free establish message, if any */
rr->rr_est_req = 0;
if (rr->rr_est_msg) {
msgb_free(rr->rr_est_msg);
rr->rr_est_msg = NULL;
}
/* free all pending messages */
while((msg = msgb_dequeue(&rr->downqueue)))
msgb_free(msg);
/* clear all descriptions of last channel */
memset(&rr->cd_now, 0, sizeof(rr->cd_now));
/* reset ciphering */
rr->cipher_on = 0;
/* reset audio mode */
/* tell cell selection process to return to idle mode
* NOTE: this must be sent unbuffered, because it will
* leave camping state, so it locks against subsequent
* establishment of dedicated channel, before the
* cell selection process returned to camping state
* again. (after cell reselection)
*/
nmsg = gsm322_msgb_alloc(GSM322_EVENT_RET_IDLE);
if (!nmsg)
return;
/* return to same cell after LOC.UPD. */
if (rr->est_cause == RR_EST_CAUSE_LOC_UPD) {
em = (struct gsm322_msg *) nmsg->data;
em->same_cell = 1;
}
gsm322_c_event(rr->ms, nmsg);
msgb_free(nmsg);
/* reset any BA range */
rr->ba_ranges = 0;
}
}
const char *gsm48_sapi3_state_names[] = {
"idle",
"wait establishment",
"established",
"wait release",
};
static void new_sapi3_state(struct gsm48_rrlayer *rr, int state)
{
if (state < 0 || state >=
(sizeof(gsm48_sapi3_state_names) / sizeof(char *)))
return;
LOGP(DRR, LOGL_INFO, "new SAPI 3 link state %s -> %s\n",
gsm48_sapi3_state_names[rr->sapi3_state],
gsm48_sapi3_state_names[state]);
rr->sapi3_state = state;
}
/*
* messages
*/
/* names of RR-SAP */
static const struct value_string gsm48_rr_msg_names[] = {
{ GSM48_RR_EST_REQ, "RR_EST_REQ" },
{ GSM48_RR_EST_IND, "RR_EST_IND" },
{ GSM48_RR_EST_CNF, "RR_EST_CNF" },
{ GSM48_RR_REL_IND, "RR_REL_IND" },
{ GSM48_RR_SYNC_IND, "RR_SYNC_IND" },
{ GSM48_RR_DATA_REQ, "RR_DATA_REQ" },
{ GSM48_RR_DATA_IND, "RR_DATA_IND" },
{ GSM48_RR_UNIT_DATA_IND, "RR_UNIT_DATA_IND" },
{ GSM48_RR_ABORT_REQ, "RR_ABORT_REQ" },
{ GSM48_RR_ABORT_IND, "RR_ABORT_IND" },
{ GSM48_RR_ACT_REQ, "RR_ACT_REQ" },
{ 0, NULL }
};
const char *get_rr_name(int value)
{
return get_value_string(gsm48_rr_msg_names, value);
}
/* allocate GSM 04.08 layer 3 message */
struct msgb *gsm48_l3_msgb_alloc(void)
{
struct msgb *msg;
msg = msgb_alloc_headroom(L3_ALLOC_SIZE+L3_ALLOC_HEADROOM,
L3_ALLOC_HEADROOM, "GSM 04.08 L3");
if (!msg)
return NULL;
msg->l3h = msg->data;
return msg;
}
/* allocate GSM 04.06 layer 2 RSL message */
struct msgb *gsm48_rsl_msgb_alloc(void)
{
struct msgb *msg;
msg = msgb_alloc_headroom(RSL_ALLOC_SIZE+RSL_ALLOC_HEADROOM,
RSL_ALLOC_HEADROOM, "GSM 04.06 RSL");
if (!msg)
return NULL;
msg->l2h = msg->data;
return msg;
}
/* allocate GSM 04.08 message (RR-SAP) */
struct msgb *gsm48_rr_msgb_alloc(int msg_type)
{
struct msgb *msg;
struct gsm48_rr_hdr *rrh;
msg = msgb_alloc_headroom(RR_ALLOC_SIZE+RR_ALLOC_HEADROOM,
RR_ALLOC_HEADROOM, "GSM 04.08 RR");
if (!msg)
return NULL;
rrh = (struct gsm48_rr_hdr *) msgb_put(msg, sizeof(*rrh));
rrh->msg_type = msg_type;
return msg;
}
/* queue message (RR-SAP) */
int gsm48_rr_upmsg(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_mmlayer *mm = &ms->mmlayer;
msgb_enqueue(&mm->rr_upqueue, msg);
return 0;
}
/* push rsl header and send (RSL-SAP) */
int gsm48_send_rsl(struct osmocom_ms *ms, uint8_t msg_type,
struct msgb *msg, uint8_t link_id)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
if (!msg->l3h) {
LOGP(DRR, LOGL_ERROR, "FIX l3h\n");
return -EINVAL;
}
rsl_rll_push_l3(msg, msg_type, rr->cd_now.chan_nr, link_id, 1);
return lapdm_rslms_recvmsg(msg, &ms->lapdm_channel);
}
/* push rsl header without L3 info and send (RSL-SAP) */
static int gsm48_send_rsl_nol3(struct osmocom_ms *ms, uint8_t msg_type,
struct msgb *msg, uint8_t link_id)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
rsl_rll_push_hdr(msg, msg_type, rr->cd_now.chan_nr,
link_id, 1);
return lapdm_rslms_recvmsg(msg, &ms->lapdm_channel);
}
/* enqueue messages (RSL-SAP) */
static int rcv_rsl(struct msgb *msg, struct lapdm_entity *le, void *l3ctx)
{
struct osmocom_ms *ms = l3ctx;
struct gsm48_rrlayer *rr = &ms->rrlayer;
msgb_enqueue(&rr->rsl_upqueue, msg);
return 0;
}
/* dequeue messages (RSL-SAP) */
int gsm48_rsl_dequeue(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *msg;
int work = 0;
while ((msg = msgb_dequeue(&rr->rsl_upqueue))) {
/* msg is freed there */
gsm48_rcv_rsl(ms, msg);
work = 1; /* work done */
}
return work;
}
int gsm48_rr_start_monitor(struct osmocom_ms *ms)
{
ms->rrlayer.monitor = 1;
return 0;
}
int gsm48_rr_stop_monitor(struct osmocom_ms *ms)
{
ms->rrlayer.monitor = 0;
return 0;
}
/* release L3 link in both directions in case of main link release */
static int gsm48_release_sapi3_link(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_rr_hdr *nrrh;
struct msgb *nmsg;
uint8_t *mode;
if (rr->sapi3_state == GSM48_RR_SAPI3ST_IDLE)
return 0;
LOGP(DRR, LOGL_INFO, "Main signallin link is down, so release SAPI 3 "
"link locally.\n");
new_sapi3_state(rr, GSM48_RR_SAPI3ST_IDLE);
/* disconnect the SAPI 3 signalling link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 1; /* local release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, rr->sapi3_link_id);
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_NORMAL;
nrrh->sapi = rr->sapi3_link_id & 7;
gsm48_rr_upmsg(ms, nmsg);
return 0;
}
/*
* timers handling
*/
/* special timer to monitor measurements */
static void timeout_rr_meas(void *arg)
{
struct gsm48_rrlayer *rr = arg;
struct gsm322_cellsel *cs = &rr->ms->cellsel;
struct rx_meas_stat *meas = &rr->ms->meas;
struct gsm_settings *set = &rr->ms->settings;
int rxlev, berr, snr;
uint8_t ch_type, ch_subch, ch_ts;
char text[256];
/* don't monitor if no cell is selected or if we scan neighbour cells */
if (!cs->selected || cs->neighbour) {
sprintf(text, "MON: not camping on serving cell");
goto restart;
} else if (!meas->frames) {
sprintf(text, "MON: no cell info");
} else {
rxlev = (meas->rxlev + meas->frames / 2) / meas->frames;
berr = (meas->berr + meas->frames / 2) / meas->frames;
snr = (meas->snr + meas->frames / 2) / meas->frames;
sprintf(text, "MON: f=%d lev=%s snr=%2d ber=%3d "
"LAI=%s %s %04x ID=%04x", cs->sel_arfcn,
gsm_print_rxlev(rxlev), snr, berr,
gsm_print_mcc(cs->sel_mcc),
gsm_print_mnc(cs->sel_mnc), cs->sel_lac, cs->sel_id);
if (rr->state == GSM48_RR_ST_DEDICATED) {
rsl_dec_chan_nr(rr->cd_now.chan_nr, &ch_type,
&ch_subch, &ch_ts);
sprintf(text + strlen(text), " TA=%d pwr=%d TS=%d",
rr->cd_now.ind_ta - set->alter_delay,
(set->alter_tx_power) ? set->alter_tx_power_value
: rr->cd_now.ind_tx_power, ch_ts);
if (ch_type == RSL_CHAN_SDCCH8_ACCH
|| ch_type == RSL_CHAN_SDCCH4_ACCH)
sprintf(text + strlen(text), "/%d", ch_subch);
} else
gsm322_meas(rr->ms, rxlev);
}
LOGP(DRR, LOGL_INFO, "%s\n", text);
if (rr->monitor)
vty_notify(rr->ms, "%s\n", text);
if (rr->dm_est)
gsm48_rr_tx_meas_rep(rr->ms);
restart:
meas->frames = meas->snr = meas->berr = meas->rxlev = 0;
start_rr_t_meas(rr, 1, 0);
}
/* special timer to assign / handover when starting time is reached */
static void timeout_rr_t_starting(void *arg)
{
struct gsm48_rrlayer *rr = arg;
struct msgb *nmsg;
LOGP(DRR, LOGL_INFO, "starting timer has fired\n");
/* open channel when starting timer of IMM.ASS has fired */
if (rr->modify_state == GSM48_RR_MOD_IMM_ASS) {
rr->modify_state = GSM48_RR_MOD_NONE;
gsm48_rr_dl_est(rr->ms);
return;
}
/* start suspension of current link */
LOGP(DRR, LOGL_INFO, "request suspension of data link\n");
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return;
gsm48_send_rsl(rr->ms, RSL_MT_SUSP_REQ, nmsg, 0);
/* release SAPI 3 link, if exits
* FIXME: suspend and resume afterward */
gsm48_release_sapi3_link(rr->ms);
}
/* special timer to ensure that UA is sent before disconnecting channel */
static void timeout_rr_t_rel_wait(void *arg)
{
struct gsm48_rrlayer *rr = arg;
LOGP(DRR, LOGL_INFO, "L2 release timer has fired, done waiting\n");
/* return to idle now */
new_rr_state(rr, GSM48_RR_ST_IDLE);
}
/* 3.4.13.1.1: Timeout of T3110 */
static void timeout_rr_t3110(void *arg)
{
struct gsm48_rrlayer *rr = arg;
struct osmocom_ms *ms = rr->ms;
struct msgb *nmsg;
uint8_t *mode;
LOGP(DRR, LOGL_INFO, "timer T3110 has fired, release locally\n");
new_rr_state(rr, GSM48_RR_ST_REL_PEND);
/* disconnect the main signalling link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 1; /* local release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, 0);
/* release SAPI 3 link, if exits */
gsm48_release_sapi3_link(ms);
return;
}
static void timeout_rr_t3122(void *arg)
{
LOGP(DRR, LOGL_INFO, "timer T3122 has fired\n");
}
static void timeout_rr_t3126(void *arg)
{
struct gsm48_rrlayer *rr = arg;
struct osmocom_ms *ms = rr->ms;
LOGP(DRR, LOGL_INFO, "timer T3126 has fired\n");
if (rr->rr_est_req) {
struct msgb *msg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
struct gsm48_rr_hdr *rrh;
LOGP(DSUM, LOGL_INFO, "Requesting channel failed\n");
if (!msg)
return;
rrh = (struct gsm48_rr_hdr *)msg->data;
rrh->cause = RR_REL_CAUSE_RA_FAILURE;
gsm48_rr_upmsg(ms, msg);
}
new_rr_state(rr, GSM48_RR_ST_IDLE);
}
static void start_rr_t_meas(struct gsm48_rrlayer *rr, int sec, int micro)
{
rr->t_meas.cb = timeout_rr_meas;
rr->t_meas.data = rr;
osmo_timer_schedule(&rr->t_meas, sec, micro);
}
static void start_rr_t_rel_wait(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T_rel_wait with %d.%03d seconds\n", sec,
micro / 1000);
rr->t_rel_wait.cb = timeout_rr_t_rel_wait;
rr->t_rel_wait.data = rr;
osmo_timer_schedule(&rr->t_rel_wait, sec, micro);
}
static void start_rr_t_starting(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T_starting with %d.%03d seconds\n", sec,
micro / 1000);
rr->t_starting.cb = timeout_rr_t_starting;
rr->t_starting.data = rr;
osmo_timer_schedule(&rr->t_starting, sec, micro);
}
static void start_rr_t3110(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T3110 with %d.%03d seconds\n", sec,
micro / 1000);
rr->t3110.cb = timeout_rr_t3110;
rr->t3110.data = rr;
osmo_timer_schedule(&rr->t3110, sec, micro);
}
static void start_rr_t3122(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T3122 with %d.%03d seconds\n", sec,
micro / 1000);
rr->t3122.cb = timeout_rr_t3122;
rr->t3122.data = rr;
osmo_timer_schedule(&rr->t3122, sec, micro);
}
static void start_rr_t3126(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T3126 with %d.%03d seconds\n", sec,
micro / 1000);
rr->t3126.cb = timeout_rr_t3126;
rr->t3126.data = rr;
osmo_timer_schedule(&rr->t3126, sec, micro);
}
static void stop_rr_t_meas(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t_meas)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T_meas\n");
osmo_timer_del(&rr->t_meas);
}
}
static void stop_rr_t_starting(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t_starting)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T_starting\n");
osmo_timer_del(&rr->t_starting);
}
}
static void stop_rr_t_rel_wait(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t_rel_wait)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T_rel_wait\n");
osmo_timer_del(&rr->t_rel_wait);
}
}
static void stop_rr_t3110(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t3110)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T3110\n");
osmo_timer_del(&rr->t3110);
}
}
static void stop_rr_t3122(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t3122)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T3122\n");
osmo_timer_del(&rr->t3122);
}
}
static void stop_rr_t3124(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t3124)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T3124\n");
osmo_timer_del(&rr->t3124);
}
}
static void stop_rr_t3126(struct gsm48_rrlayer *rr)
{
if (osmo_timer_pending(&rr->t3126)) {
LOGP(DRR, LOGL_INFO, "stopping pending timer T3126\n");
osmo_timer_del(&rr->t3126);
}
}
/*
* status
*/
/* send rr status request */
int gsm48_rr_tx_rr_status(struct osmocom_ms *ms, uint8_t cause)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_rr_status *st;
LOGP(DRR, LOGL_INFO, "RR STATUS (cause #%d)\n", cause);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
st = (struct gsm48_rr_status *) msgb_put(nmsg, sizeof(*st));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_STATUS;
/* rr cause */
st->rr_cause = cause;
return gsm48_send_rsl(ms, RSL_MT_DATA_REQ, nmsg, 0);
}
/*
* ciphering
*/
/* send chiperhing mode complete */
static int gsm48_rr_tx_cip_mode_cpl(struct osmocom_ms *ms, uint8_t cr)
{
struct gsm_settings *set = &ms->settings;
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_rr_hdr *nrrh;
uint8_t buf[11], *tlv;
LOGP(DRR, LOGL_INFO, "CIPHERING MODE COMPLETE (cr %d)\n", cr);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_CIPH_M_COMPL;
/* MI */
if (cr) {
gsm48_generate_mid_from_imsi(buf, set->imeisv);
/* alter MI type */
buf[2] = (buf[2] & ~GSM_MI_TYPE_MASK) | GSM_MI_TYPE_IMEISV;
tlv = msgb_put(nmsg, 2 + buf[1]);
memcpy(tlv, buf, 2 + buf[1]);
}
gsm48_send_rsl(ms, RSL_MT_DATA_REQ, nmsg, 0);
/* send RR_SYNC_IND(ciphering) */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_SYNC_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_SYNC_CAUSE_CIPHERING;
return gsm48_rr_upmsg(ms, nmsg);
}
/* receive ciphering mode command */
static int gsm48_rr_rx_cip_mode_cmd(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm_subscriber *subscr = &ms->subscr;
struct gsm_settings *set = &ms->settings;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_cip_mode_cmd *cm = (struct gsm48_cip_mode_cmd *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*cm);
uint8_t sc, alg_id, cr;
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of CIPHERING MODE COMMAND "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* cipher mode setting */
sc = cm->sc;
alg_id = cm->alg_id;
/* cipher mode response */
cr = cm->cr;
if (!sc)
LOGP(DRR, LOGL_INFO, "CIPHERING MODE COMMAND (sc=%u, cr=%u)\n",
sc, cr);
else
LOGP(DRR, LOGL_INFO, "CIPHERING MODE COMMAND (sc=%u, "
"algo=A5/%d cr=%u)\n", sc, alg_id + 1, cr);
/* 3.4.7.2 */
if (rr->cipher_on && sc) {
LOGP(DRR, LOGL_NOTICE, "chiphering already applied\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* check if we actually support this cipher */
if (sc && ((alg_id == GSM_CIPHER_A5_1 && !set->a5_1)
|| (alg_id == GSM_CIPHER_A5_2 && !set->a5_2)
|| (alg_id == GSM_CIPHER_A5_3 && !set->a5_3)
|| (alg_id == GSM_CIPHER_A5_4 && !set->a5_4)
|| (alg_id == GSM_CIPHER_A5_5 && !set->a5_5)
|| (alg_id == GSM_CIPHER_A5_6 && !set->a5_6)
|| (alg_id == GSM_CIPHER_A5_7 && !set->a5_7))) {
LOGP(DRR, LOGL_NOTICE, "algo not supported\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* check if we have no key */
if (sc && subscr->key_seq == 7) {
LOGP(DRR, LOGL_NOTICE, "no key available\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* change to ciphering */
rr->cipher_on = sc;
rr->cipher_type = alg_id;
if (rr->cipher_on)
l1ctl_tx_crypto_req(ms, rr->cd_now.chan_nr,
rr->cipher_type + 1, subscr->key, 8);
else
l1ctl_tx_crypto_req(ms, rr->cd_now.chan_nr,
0, NULL, 0);
/* response (using the new mode) */
return gsm48_rr_tx_cip_mode_cpl(ms, cr);
}
/*
* classmark
*/
/* Encode "Classmark 3" (10.5.1.7) */
static int gsm48_rr_enc_cm3(struct osmocom_ms *ms, uint8_t *buf, uint8_t *len)
{
struct gsm_support *sup = &ms->support;
struct gsm_settings *set = &ms->settings;
struct bitvec bv;
memset(&bv, 0, sizeof(bv));
bv.data = buf;
bv.data_len = 12;
/* spare bit */
bitvec_set_bit(&bv, 0);
/* band 3 supported */
if (set->dcs)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
/* band 2 supported */
if (set->e_gsm || set->r_gsm)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
/* band 1 supported */
if (set->p_gsm && !(set->e_gsm || set->r_gsm))
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
/* a5 bits */
if (set->a5_7)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
if (set->a5_6)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
if (set->a5_5)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
if (set->a5_4)
bitvec_set_bit(&bv, ONE);
else
bitvec_set_bit(&bv, ZERO);
/* radio capability */
if (!set->dcs && !set->p_gsm && !(set->e_gsm || set->r_gsm)) {
/* Fig. 10.5.7 / TS 24.0008: none of dcs, p, e, r */
} else
if (set->dcs && !set->p_gsm && !(set->e_gsm || set->r_gsm)) {
/* dcs only */
bitvec_set_uint(&bv, 0, 4);
bitvec_set_uint(&bv, set->class_dcs, 4);
} else
if (set->dcs && (set->p_gsm || (set->e_gsm || set->r_gsm))) {
/* dcs */
bitvec_set_uint(&bv, set->class_dcs, 4);
/* low band */
bitvec_set_uint(&bv, set->class_900, 4);
} else {
/* low band only */
bitvec_set_uint(&bv, 0, 4);
bitvec_set_uint(&bv, set->class_900, 4);
}
/* r support */
if (set->r_gsm) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_900, 3);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* multi slot support */
if (sup->ms_sup) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, sup->ms_sup, 5);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* ucs2 treatment */
if (sup->ucs2_treat) {
bitvec_set_bit(&bv, ONE);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* support extended measurements */
if (sup->ext_meas) {
bitvec_set_bit(&bv, ONE);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* support measurement capability */
if (sup->meas_cap) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, sup->sms_val, 4);
bitvec_set_uint(&bv, sup->sm_val, 4);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* positioning method capability */
if (sup->loc_serv) {
bitvec_set_bit(&bv, ONE);
bitvec_set_bit(&bv, sup->e_otd_ass == 1);
bitvec_set_bit(&bv, sup->e_otd_based == 1);
bitvec_set_bit(&bv, sup->gps_ass == 1);
bitvec_set_bit(&bv, sup->gps_based == 1);
bitvec_set_bit(&bv, sup->gps_conv == 1);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* The following bits are described in TS 24.008 */
/* EDGE multi slot support */
if (set->edge_ms_sup) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->edge_ms_sup, 5);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* EDGE support */
if (set->edge_psk_sup) {
bitvec_set_bit(&bv, ONE);
bitvec_set_bit(&bv, set->edge_psk_uplink == 1);
if (set->p_gsm || (set->e_gsm || set->r_gsm)) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_900_edge, 2);
} else {
bitvec_set_bit(&bv, ZERO);
}
if (set->dcs || set->pcs) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_dcs_pcs_edge, 2);
} else {
bitvec_set_bit(&bv, ZERO);
}
} else {
bitvec_set_bit(&bv, ZERO);
}
/* GSM 400 Bands */
if (set->gsm_480 || set->gsm_450) {
bitvec_set_bit(&bv, ONE);
bitvec_set_bit(&bv, set->gsm_480 == 1);
bitvec_set_bit(&bv, set->gsm_450 == 1);
bitvec_set_uint(&bv, set->class_400, 4);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* GSM 850 Band */
if (set->gsm_850) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_850, 4);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* PCS Band */
if (set->pcs) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_pcs, 4);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* RAT Capability */
bitvec_set_bit(&bv, set->umts_fdd == 1);
bitvec_set_bit(&bv, set->umts_tdd == 1);
bitvec_set_bit(&bv, set->cdma_2000 == 1);
/* DTM */
if (set->dtm) {
bitvec_set_bit(&bv, ONE);
bitvec_set_uint(&bv, set->class_dtm, 2);
bitvec_set_bit(&bv, set->dtm_mac == 1);
bitvec_set_bit(&bv, set->dtm_egprs == 1);
} else {
bitvec_set_bit(&bv, ZERO);
}
/* info: The max number of bits are about 80. */
/* partial bytes will be padded with zero */
*len = (bv.cur_bit + 7) >> 3;
bitvec_fill(&bv, (*len*8) - bv.cur_bit, ZERO);
return 0;
}
/* encode classmark 2 */
int gsm48_rr_enc_cm2(struct osmocom_ms *ms, struct gsm48_classmark2 *cm,
uint16_t arfcn)
{
struct gsm_support *sup = &ms->support;
struct gsm_settings *set = &ms->settings;
cm->pwr_lev = gsm48_current_pwr_lev(set, arfcn);
cm->a5_1 = !set->a5_1;
cm->es_ind = sup->es_ind;
cm->rev_lev = sup->rev_lev;
cm->fc = (set->r_gsm || set->e_gsm);
cm->vgcs = sup->vgcs;
cm->vbs = sup->vbs;
cm->sm_cap = set->sms_ptp;
cm->ss_scr = sup->ss_ind;
cm->ps_cap = sup->ps_cap;
cm->a5_2 = set->a5_2;
cm->a5_3 = set->a5_3;
cm->cmsp = sup->cmsp;
cm->solsa = sup->solsa;
cm->lcsva_cap = sup->lcsva;
return 0;
}
/* send classmark change */
static int gsm48_rr_tx_cm_change(struct osmocom_ms *ms)
{
struct gsm_support *sup = &ms->support;
struct gsm_settings *set = &ms->settings;
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_cm_change *cc;
uint8_t cm3[14], *tlv;
LOGP(DRR, LOGL_INFO, "CLASSMARK CHANGE\n");
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
cc = (struct gsm48_cm_change *) msgb_put(nmsg, sizeof(*cc));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_CLSM_CHG;
/* classmark 2 */
cc->cm2_len = sizeof(cc->cm2);
gsm48_rr_enc_cm2(ms, &cc->cm2, rr->cd_now.arfcn);
/* classmark 3 */
if (set->dcs || set->pcs || set->e_gsm || set->r_gsm || set->gsm_850
|| set->a5_7 || set->a5_6 || set->a5_5 || set->a5_4
|| sup->ms_sup
|| sup->ucs2_treat
|| sup->ext_meas || sup->meas_cap
|| sup->loc_serv) {
cc->cm2.cm3 = 1;
cm3[0] = GSM48_IE_CLASSMARK3;
gsm48_rr_enc_cm3(ms, cm3 + 2, &cm3[1]);
tlv = msgb_put(nmsg, 2 + cm3[1]);
memcpy(tlv, cm3, 2 + cm3[1]);
}
return gsm48_send_rsl(ms, RSL_MT_DATA_REQ, nmsg, 0);
}
/* receiving classmark enquiry */
static int gsm48_rr_rx_cm_enq(struct osmocom_ms *ms, struct msgb *msg)
{
/* send classmark */
return gsm48_rr_tx_cm_change(ms);
}
/*
* random access
*/
/* start random access */
static int gsm48_rr_chan_req(struct osmocom_ms *ms, int cause, int paging,
int paging_mi_type)
{
struct gsm_settings *set = &ms->settings;
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
uint8_t chan_req_val, chan_req_mask;
int rc;
LOGP(DSUM, LOGL_INFO, "Establish radio link due to %s request\n",
(paging) ? "paging" : "mobility management");
/* ignore paging, if not camping */
if (paging
&& (!cs->selected || (cs->state != GSM322_C3_CAMPED_NORMALLY
&& cs->state != GSM322_C7_CAMPED_ANY_CELL))) {
LOGP(DRR, LOGL_INFO, "Paging, but not camping, ignore.\n");
return -EINVAL;
}
/* ignore channel request while not camping on a cell */
if (!cs->selected) {
LOGP(DRR, LOGL_INFO, "Channel request rejected, we did not "
"properly select the serving cell.\n");
goto rel_ind;
}
/* tell cell selection process to leave idle mode
* NOTE: this must be sent unbuffered, because the state may not
* change until idle mode is left
*/
nmsg = gsm322_msgb_alloc(GSM322_EVENT_LEAVE_IDLE);
if (!nmsg)
return -ENOMEM;
rc = gsm322_c_event(ms, nmsg);
msgb_free(nmsg);
if (rc) {
if (paging)
return rc;
LOGP(DRR, LOGL_INFO, "Failed to leave IDLE mode.\n");
goto undefined;
}
/* 3.3.1.1.2 */
new_rr_state(rr, GSM48_RR_ST_CONN_PEND);
/* set assignment state */
rr->wait_assign = 0;
/* number of retransmissions (with first transmission) */
rr->n_chan_req = s->max_retrans + 1;
/* generate CHAN REQ (9.1.8) */
switch (cause) {
case RR_EST_CAUSE_EMERGENCY:
/* 101xxxxx */
chan_req_mask = 0x1f;
chan_req_val = 0xa0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (Emergency call)\n",
chan_req_val);
break;
case RR_EST_CAUSE_REESTAB_TCH_F:
chan_req_mask = 0x1f;
chan_req_val = 0xc0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (re-establish "
"TCH/F)\n", chan_req_val);
break;
case RR_EST_CAUSE_REESTAB_TCH_H:
if (s->neci) {
chan_req_mask = 0x03;
chan_req_val = 0x68;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x "
"(re-establish TCH/H with NECI)\n",
chan_req_val);
} else {
chan_req_mask = 0x1f;
chan_req_val = 0xc0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x "
"(re-establish TCH/H no NECI)\n", chan_req_val);
}
break;
case RR_EST_CAUSE_REESTAB_2_TCH_H:
if (s->neci) {
chan_req_mask = 0x03;
chan_req_val = 0x6c;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x "
"(re-establish TCH/H+TCH/H with NECI)\n",
chan_req_val);
} else {
chan_req_mask = 0x1f;
chan_req_val = 0xc0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x "
"(re-establish TCH/H+TCH/H no NECI)\n",
chan_req_val);
}
break;
case RR_EST_CAUSE_ANS_PAG_ANY:
chan_req_mask = 0x1f;
chan_req_val = 0x80;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING "
"Any channel)\n", chan_req_val);
break;
case RR_EST_CAUSE_ANS_PAG_SDCCH:
chan_req_mask = 0x0f;
chan_req_val = 0x10;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING SDCCH)\n",
chan_req_val);
break;
case RR_EST_CAUSE_ANS_PAG_TCH_F:
switch (set->ch_cap) {
case GSM_CAP_SDCCH:
chan_req_mask = 0x0f;
chan_req_val = 0x10;
break;
case GSM_CAP_SDCCH_TCHF:
chan_req_mask = 0x1f;
chan_req_val = 0x80;
break;
default:
chan_req_mask = 0x0f;
chan_req_val = 0x20;
break;
}
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING TCH/F)\n",
chan_req_val);
break;
case RR_EST_CAUSE_ANS_PAG_TCH_ANY:
switch (set->ch_cap) {
case GSM_CAP_SDCCH:
chan_req_mask = 0x0f;
chan_req_val = 0x10;
break;
case GSM_CAP_SDCCH_TCHF:
chan_req_mask = 0x1f;
chan_req_val = 0x80;
break;
default:
chan_req_mask = 0x0f;
chan_req_val = 0x30;
break;
}
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING TCH/H or "
"TCH/F)\n", chan_req_val);
break;
case RR_EST_CAUSE_ORIG_TCHF:
/* ms supports no dual rate */
chan_req_mask = 0x1f;
chan_req_val = 0xe0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (Orig TCH/F)\n",
chan_req_val);
break;
case RR_EST_CAUSE_LOC_UPD:
if (s->neci) {
chan_req_mask = 0x0f;
chan_req_val = 0x00;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (Location "
"Update with NECI)\n", chan_req_val);
} else {
chan_req_mask = 0x1f;
chan_req_val = 0x00;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (Location "
"Update no NECI)\n", chan_req_val);
}
break;
case RR_EST_CAUSE_OTHER_SDCCH:
if (s->neci) {
chan_req_mask = 0x0f;
chan_req_val = 0x10;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (OTHER "
"with NECI)\n", chan_req_val);
} else {
chan_req_mask = 0x1f;
chan_req_val = 0xe0;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (OTHER "
"no NECI)\n", chan_req_val);
}
break;
default:
if (!rr->rr_est_req) /* no request from MM */
return -EINVAL;
LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: with unknown "
"establishment cause: %d\n", cause);
undefined:
LOGP(DSUM, LOGL_INFO, "Requesting channel failed\n");
rel_ind:
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_UNDEFINED;
gsm48_rr_upmsg(ms, nmsg);
new_rr_state(rr, GSM48_RR_ST_IDLE);
return -EINVAL;
}
/* store value, mask and history */
rr->chan_req_val = chan_req_val;
rr->chan_req_mask = chan_req_mask;
rr->cr_hist[2].valid = 0;
rr->cr_hist[1].valid = 0;
rr->cr_hist[0].valid = 0;
/* store establishment cause, so 'choose cell' selects the last cell
* after location updating */
rr->est_cause = cause;
/* store paging mobile identity type, if we respond to paging */
rr->paging_mi_type = paging_mi_type;
/* if channel is already active somehow */
if (cs->ccch_state == GSM322_CCCH_ST_DATA)
return gsm48_rr_tx_rand_acc(ms, NULL);
return 0;
}
/* send first/next channel request in conn pend state */
int gsm48_rr_tx_rand_acc(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = &ms->cellsel.sel_si;
struct gsm_settings *set = &ms->settings;
struct msgb *nmsg;
struct abis_rsl_cchan_hdr *ncch;
int slots;
uint8_t chan_req;
uint8_t tx_power;
enum gsm_band band;
gsm_arfcn2band_rc(cs->arfcn, &band);
/* already assigned */
if (rr->wait_assign == 2)
return 0;
/* store frame number */
if (msg) {
struct abis_rsl_cchan_hdr *ch = msgb_l2(msg);
struct gsm48_req_ref *ref =
(struct gsm48_req_ref *) (ch->data + 1);
if (msgb_l2len(msg) < sizeof(*ch) + sizeof(*ref)) {
LOGP(DRR, LOGL_ERROR, "CHAN_CNF too slort\n");
return -EINVAL;
}
/* shift history and store */
memcpy(&(rr->cr_hist[2]), &(rr->cr_hist[1]),
sizeof(struct gsm48_cr_hist));
memcpy(&(rr->cr_hist[1]), &(rr->cr_hist[0]),
sizeof(struct gsm48_cr_hist));
rr->cr_hist[0].valid = 1;
rr->cr_hist[0].ref.ra = rr->cr_ra;
rr->cr_hist[0].ref.t1 = ref->t1;
rr->cr_hist[0].ref.t2 = ref->t2;
rr->cr_hist[0].ref.t3_low = ref->t3_low;
rr->cr_hist[0].ref.t3_high = ref->t3_high;
}
if (cs->ccch_state != GSM322_CCCH_ST_DATA) {
LOGP(DRR, LOGL_INFO, "CCCH channel activation failed.\n");
fail:
if (rr->rr_est_req) {
struct msgb *msg =
gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
struct gsm48_rr_hdr *rrh;
LOGP(DSUM, LOGL_INFO, "Requesting channel failed\n");
if (!msg)
return -ENOMEM;
rrh = (struct gsm48_rr_hdr *)msg->data;
rrh->cause = RR_REL_CAUSE_RA_FAILURE;
gsm48_rr_upmsg(ms, msg);
}
new_rr_state(rr, GSM48_RR_ST_IDLE);
return 0;
}
if (!s || !s->si3 || !s->tx_integer) {
LOGP(DRR, LOGL_NOTICE, "Not enough SYSINFO\n");
goto fail;
}
if (rr->state == GSM48_RR_ST_IDLE) {
LOGP(DRR, LOGL_INFO, "MM already released RR.\n");
return 0;
}
LOGP(DRR, LOGL_INFO, "RANDOM ACCESS (requests left %d)\n",
rr->n_chan_req);
if (!rr->n_chan_req) {
LOGP(DRR, LOGL_INFO, "Done with sending RANDOM ACCESS "
"bursts\n");
if (!osmo_timer_pending(&rr->t3126))
start_rr_t3126(rr, 5, 0); /* TODO improve! */
return 0;
}
rr->n_chan_req--;
if (rr->wait_assign == 0) {
/* first random access, without delay of slots */
slots = 0;
rr->wait_assign = 1;
} else {
/* subsequent random access, with slots from table 3.1 */
switch(s->tx_integer) {
case 3: case 8: case 14: case 50:
if (s->ccch_conf != 1) /* not combined CCCH */
slots = 55;
else
slots = 41;
break;
case 4: case 9: case 16:
if (s->ccch_conf != 1)
slots = 76;
else
slots = 52;
break;
case 5: case 10: case 20:
if (s->ccch_conf != 1)
slots = 109;
else
slots = 58;
break;
case 6: case 11: case 25:
if (s->ccch_conf != 1)
slots = 163;
else
slots = 86;
break;
default:
if (s->ccch_conf != 1)
slots = 217;
else
slots = 115;
break;
}
}
chan_req = layer23_random();
chan_req &= rr->chan_req_mask;
chan_req |= rr->chan_req_val;
LOGP(DRR, LOGL_INFO, "RANDOM ACCESS (Tx-integer %d combined %s "
"S(lots) %d ra 0x%02x)\n", s->tx_integer,
(s->ccch_conf == 1) ? "yes": "no", slots, chan_req);
slots = (random() % s->tx_integer) + slots;
/* (re)send CHANNEL RQD with new randiom */
nmsg = gsm48_rsl_msgb_alloc();
if (!nmsg)
return -ENOMEM;
ncch = (struct abis_rsl_cchan_hdr *) msgb_put(nmsg, sizeof(*ncch)
+ 4 + 2 + 2);
rsl_init_cchan_hdr(ncch, RSL_MT_CHAN_RQD);
ncch->chan_nr = RSL_CHAN_RACH;
ncch->data[0] = RSL_IE_REQ_REFERENCE;
ncch->data[1] = chan_req;
ncch->data[2] = (slots >> 8) | ((s->ccch_conf == 1) << 7);
ncch->data[3] = slots;
ncch->data[4] = RSL_IE_ACCESS_DELAY;
ncch->data[5] = set->alter_delay; /* (-)=earlier (+)=later */
ncch->data[6] = RSL_IE_MS_POWER;
if (set->alter_tx_power) {
tx_power = set->alter_tx_power_value;
LOGP(DRR, LOGL_INFO, "Use alternative tx-power %d (%d dBm)\n",
tx_power, ms_pwr_dbm(band, tx_power));
} else {
tx_power = s->ms_txpwr_max_cch;
/* power offset in case of DCS1800 */
if (s->po && (cs->arfcn & 1023) >= 512
&& (cs->arfcn & 1023) <= 885) {
LOGP(DRR, LOGL_INFO, "Use MS-TXPWR-MAX-CCH power value "
"%d (%d dBm) with offset %d dBm\n", tx_power,
ms_pwr_dbm(band, tx_power), s->po_value * 2);
/* use reserved bits 7,8 for offset (+ X * 2dB) */
tx_power |= s->po_value << 6;
} else
LOGP(DRR, LOGL_INFO, "Use MS-TXPWR-MAX-CCH power value "
"%d (%d dBm)\n", tx_power, ms_pwr_dbm(band, tx_power));
}
ncch->data[7] = tx_power;
/* set initial indications */
rr->cd_now.ind_tx_power = s->ms_txpwr_max_cch;
rr->cd_now.ind_ta = set->alter_delay;
/* store ra until confirmed, then copy it with time into cr_hist */
rr->cr_ra = chan_req;
return lapdm_rslms_recvmsg(nmsg, &ms->lapdm_channel);
}
/*
* system information
*/
/* send sysinfo event to other layers */
static int gsm48_new_sysinfo(struct osmocom_ms *ms, uint8_t type)
{
struct gsm48_sysinfo *s = ms->cellsel.si;
struct gsm322_cellsel *cs = &ms->cellsel;
struct msgb *nmsg;
struct gsm322_msg *em;
/* update list of measurements, if BA(SACCH) is complete and new */
if (s
&& (type == GSM48_MT_RR_SYSINFO_5
|| type == GSM48_MT_RR_SYSINFO_5bis
|| type == GSM48_MT_RR_SYSINFO_5ter)
&& s->si5
&& (!s->nb_ext_ind_si5 || s->si5bis)) {
struct gsm48_rr_meas *rrmeas = &ms->rrlayer.meas;
int n = 0, i, refer_pcs;
LOGP(DRR, LOGL_NOTICE, "Complete set of SI5* for BA(%d)\n",
s->nb_ba_ind_si5);
rrmeas->nc_num = 0;
refer_pcs = gsm_refer_pcs(cs->arfcn, s);
/* collect channels from freq list (1..1023,0) */
for (i = 1; i <= 1024; i++) {
if ((s->freq[i & 1023].mask & FREQ_TYPE_REP)) {
if (n == 32) {
LOGP(DRR, LOGL_NOTICE, "SI5* report "
"exceeds 32 BCCHs\n");
break;
}
if (refer_pcs && i >= 512 && i <= 810)
rrmeas->nc_arfcn[n] = i | ARFCN_PCS;
else
rrmeas->nc_arfcn[n] = i & 1023;
rrmeas->nc_rxlev_dbm[n] = -128;
LOGP(DRR, LOGL_NOTICE, "SI5* report arfcn %s\n",
gsm_print_arfcn(rrmeas->nc_arfcn[n]));
n++;
}
}
rrmeas->nc_num = n;
}
/* send sysinfo event to other layers */
nmsg = gsm322_msgb_alloc(GSM322_EVENT_SYSINFO);
if (!nmsg)
return -ENOMEM;
em = (struct gsm322_msg *) nmsg->data;
em->sysinfo = type;
gsm322_cs_sendmsg(ms, nmsg);
/* if not camping, we don't care about SI */
if (ms->cellsel.neighbour
|| (ms->cellsel.state != GSM322_C3_CAMPED_NORMALLY
&& ms->cellsel.state != GSM322_C7_CAMPED_ANY_CELL))
return 0;
/* send timer info to location update process */
nmsg = gsm48_mmevent_msgb_alloc(GSM48_MM_EVENT_SYSINFO);
if (!nmsg)
return -ENOMEM;
gsm48_mmevent_msg(ms, nmsg);
return 0;
}
/* receive "SYSTEM INFORMATION 1" message (9.1.31) */
static int gsm48_rr_rx_sysinfo1(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_1 *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 1 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 1 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si1_msg, MIN(msgb_l3len(msg), sizeof(s->si1_msg))))
return 0;
gsm48_decode_sysinfo1(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 1\n");
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 2" message (9.1.32) */
static int gsm48_rr_rx_sysinfo2(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_2 *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 2 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 2 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si2_msg, MIN(msgb_l3len(msg), sizeof(s->si2_msg))))
return 0;
gsm48_decode_sysinfo2(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2\n");
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 2bis" message (9.1.33) */
static int gsm48_rr_rx_sysinfo2bis(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_2bis *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 2bis"
" ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 2bis "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si2b_msg, MIN(msgb_l3len(msg), sizeof(s->si2b_msg))))
return 0;
gsm48_decode_sysinfo2bis(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2bis\n");
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 2ter" message (9.1.34) */
static int gsm48_rr_rx_sysinfo2ter(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_2ter *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 2ter"
" ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 2ter "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si2t_msg, MIN(msgb_l3len(msg), sizeof(s->si2t_msg))))
return 0;
gsm48_decode_sysinfo2ter(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2ter\n");
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 3" message (9.1.35) */
static int gsm48_rr_rx_sysinfo3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_3 *si = msgb_l3(msg);
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 3 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 3 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si3_msg, MIN(msgb_l3len(msg), sizeof(s->si3_msg))))
return 0;
gsm48_decode_sysinfo3(s, si, msgb_l3len(msg));
if (cs->ccch_mode == CCCH_MODE_NONE) {
cs->ccch_mode = (s->ccch_conf == 1) ? CCCH_MODE_COMBINED :
CCCH_MODE_NON_COMBINED;
LOGP(DRR, LOGL_NOTICE, "Changing CCCH_MODE to %d\n",
cs->ccch_mode);
l1ctl_tx_ccch_mode_req(ms, cs->ccch_mode);
}
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 4" message (9.1.36) */
static int gsm48_rr_rx_sysinfo4(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_4 *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 4 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 4 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si4_msg, MIN(msgb_l3len(msg), sizeof(s->si4_msg))))
return 0;
gsm48_decode_sysinfo4(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 4 (mcc %s mnc %s "
"lac 0x%04x)\n", gsm_print_mcc(s->mcc),
gsm_print_mnc(s->mnc), s->lac);
return gsm48_new_sysinfo(ms, si->header.system_information);
}
/* receive "SYSTEM INFORMATION 5" message (9.1.37) */
static int gsm48_rr_rx_sysinfo5(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_5 *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 5 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 5 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si5_msg, MIN(msgb_l3len(msg), sizeof(s->si5_msg))))
return 0;
gsm48_decode_sysinfo5(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 5\n");
return gsm48_new_sysinfo(ms, si->system_information);
}
/* receive "SYSTEM INFORMATION 5bis" message (9.1.38) */
static int gsm48_rr_rx_sysinfo5bis(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_5bis *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 5bis"
" ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 5bis "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si5b_msg, MIN(msgb_l3len(msg),
sizeof(s->si5b_msg))))
return 0;
gsm48_decode_sysinfo5bis(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 5bis\n");
return gsm48_new_sysinfo(ms, si->system_information);
}
/* receive "SYSTEM INFORMATION 5ter" message (9.1.39) */
static int gsm48_rr_rx_sysinfo5ter(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_5ter *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 5ter"
" ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 5ter "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si5t_msg, MIN(msgb_l3len(msg),
sizeof(s->si5t_msg))))
return 0;
gsm48_decode_sysinfo5ter(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 5ter\n");
return gsm48_new_sysinfo(ms, si->system_information);
}
/* receive "SYSTEM INFORMATION 6" message (9.1.39) */
static int gsm48_rr_rx_sysinfo6(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_6 *si = msgb_l3(msg);
struct gsm48_sysinfo *s = ms->cellsel.si;
struct rx_meas_stat *meas = &ms->meas;
int payload_len = msgb_l3len(msg) - sizeof(*si);
if (!s) {
LOGP(DRR, LOGL_INFO, "No cell selected, SYSTEM INFORMATION 6 "
"ignored\n");
return -EINVAL;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of SYSTEM INFORMATION 6 "
"message.\n");
return -EINVAL;
}
if (!memcmp(si, s->si6_msg, MIN(msgb_l3len(msg), sizeof(s->si6_msg))))
return 0;
gsm48_decode_sysinfo6(s, si, msgb_l3len(msg));
LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 6 (mcc %s mnc %s "
"lac 0x%04x SACCH-timeout %d)\n", gsm_print_mcc(s->mcc),
gsm_print_mnc(s->mnc), s->lac, s->sacch_radio_link_timeout);
meas->rl_fail = meas->s = s->sacch_radio_link_timeout;
LOGP(DRR, LOGL_INFO, "using (new) SACCH timeout %d\n", meas->rl_fail);
return gsm48_new_sysinfo(ms, si->system_information);
}
/*
* paging
*/
/* paging channel request */
static int gsm48_rr_chan2cause[4] = {
RR_EST_CAUSE_ANS_PAG_ANY,
RR_EST_CAUSE_ANS_PAG_SDCCH,
RR_EST_CAUSE_ANS_PAG_TCH_F,
RR_EST_CAUSE_ANS_PAG_TCH_ANY
};
/* given LV of mobile identity is checked against ms */
static uint8_t gsm_match_mi(struct osmocom_ms *ms, uint8_t *mi)
{
struct gsm322_cellsel *cs = &ms->cellsel;
char imsi[16];
uint32_t tmsi;
uint8_t mi_type;
if (mi[0] < 1)
return 0;
mi_type = mi[1] & GSM_MI_TYPE_MASK;
switch (mi_type) {
case GSM_MI_TYPE_TMSI:
if (mi[0] < 5)
return 0;
memcpy(&tmsi, mi+2, 4);
if (ms->subscr.tmsi == ntohl(tmsi)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n",
ntohl(tmsi));
return mi_type;
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(tmsi));
break;
case GSM_MI_TYPE_IMSI:
gsm48_mi_to_string(imsi, sizeof(imsi), mi + 1, mi[0]);
if (!strcmp(imsi, ms->subscr.imsi)) {
LOGP(DPAG, LOGL_INFO, " IMSI %s matches\n", imsi);
return mi_type;
} else
LOGP(DPAG, LOGL_INFO, " IMSI %s (not for us)\n", imsi);
break;
default:
LOGP(DPAG, LOGL_NOTICE, "Paging with unsupported MI type %d.\n",
mi_type);
}
return 0;
}
/* 9.1.22 PAGING REQUEST 1 message received */
static int gsm48_rr_rx_pag_req_1(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_paging1 *pa = msgb_l3(msg);
int payload_len = msgb_l3len(msg) - sizeof(*pa);
int chan_1, chan_2;
uint8_t *mi, mi_type;
/* empty paging request */
if (payload_len >= 2 && (pa->data[1] & GSM_MI_TYPE_MASK) == 0)
return 0;
/* 3.3.1.1.2: ignore paging while not camping on a cell */
if (rr->state != GSM48_RR_ST_IDLE || !cs->selected
|| (cs->state != GSM322_C3_CAMPED_NORMALLY
&& cs->state != GSM322_C7_CAMPED_ANY_CELL)
|| cs->neighbour) {
LOGP(DRR, LOGL_INFO, "PAGING ignored, we are not camping.\n");
return 0;
}
LOGP(DPAG, LOGL_INFO, "PAGING REQUEST 1\n");
if (payload_len < 2) {
short_read:
LOGP(DRR, LOGL_NOTICE, "Short read of PAGING REQUEST 1 "
"message.\n");
return -EINVAL;
}
/* channel needed */
chan_1 = pa->cneed1;
chan_2 = pa->cneed2;
/* first MI */
mi = pa->data;
if (payload_len < mi[0] + 1)
goto short_read;
if ((mi_type = gsm_match_mi(ms, mi)) > 0)
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_1], 1,
mi_type);
/* second MI */
payload_len -= mi[0] + 1;
mi = pa->data + mi[0] + 1;
if (payload_len < 2)
return 0;
if (mi[0] != GSM48_IE_MOBILE_ID)
return 0;
if (payload_len < mi[1] + 2)
goto short_read;
if ((mi_type = gsm_match_mi(ms, mi + 1)) > 0)
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_2], 1,
mi_type);
return 0;
}
/* 9.1.23 PAGING REQUEST 2 message received */
static int gsm48_rr_rx_pag_req_2(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_paging2 *pa = msgb_l3(msg);
int payload_len = msgb_l3len(msg) - sizeof(*pa);
uint8_t *mi, mi_type;
int chan_1, chan_2, chan_3;
/* 3.3.1.1.2: ignore paging while not camping on a cell */
if (rr->state != GSM48_RR_ST_IDLE || !cs->selected
|| (cs->state != GSM322_C3_CAMPED_NORMALLY
&& cs->state != GSM322_C7_CAMPED_ANY_CELL)
|| cs->neighbour) {
LOGP(DRR, LOGL_INFO, "PAGING ignored, we are not camping.\n");
return 0;
}
LOGP(DPAG, LOGL_INFO, "PAGING REQUEST 2\n");
if (payload_len < 0) {
short_read:
LOGP(DRR, LOGL_NOTICE, "Short read of PAGING REQUEST 2 "
"message .\n");
return -EINVAL;
}
/* channel needed */
chan_1 = pa->cneed1;
chan_2 = pa->cneed2;
/* first MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi1)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi1));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_1], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi1));
/* second MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi2)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi2));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_2], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi2));
/* third MI */
mi = pa->data;
if (payload_len < 2)
return 0;
if (mi[0] != GSM48_IE_MOBILE_ID)
return 0;
if (payload_len < mi[1] + 2 + 1) /* must include "channel needed" */
goto short_read;
chan_3 = mi[mi[1] + 2] & 0x03; /* channel needed */
if ((mi_type = gsm_match_mi(ms, mi + 1)) > 0)
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_3], 1,
mi_type);
return 0;
}
/* 9.1.24 PAGING REQUEST 3 message received */
static int gsm48_rr_rx_pag_req_3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_paging3 *pa = msgb_l3(msg);
int payload_len = msgb_l3len(msg) - sizeof(*pa);
int chan_1, chan_2, chan_3, chan_4;
/* 3.3.1.1.2: ignore paging while not camping on a cell */
if (rr->state != GSM48_RR_ST_IDLE || !cs->selected
|| (cs->state != GSM322_C3_CAMPED_NORMALLY
&& cs->state != GSM322_C7_CAMPED_ANY_CELL)
|| cs->neighbour) {
LOGP(DRR, LOGL_INFO, "PAGING ignored, we are not camping.\n");
return 0;
}
LOGP(DPAG, LOGL_INFO, "PAGING REQUEST 3\n");
if (payload_len < 0) { /* must include "channel needed", part of *pa */
LOGP(DRR, LOGL_NOTICE, "Short read of PAGING REQUEST 3 "
"message .\n");
return -EINVAL;
}
/* channel needed */
chan_1 = pa->cneed1;
chan_2 = pa->cneed2;
chan_3 = pa->cneed3;
chan_4 = pa->cneed4;
/* first MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi1)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi1));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_1], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi1));
/* second MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi2)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi2));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_2], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi2));
/* third MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi3)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi3));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_3], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi3));
/* fourth MI */
if (ms->subscr.tmsi == ntohl(pa->tmsi4)
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac) {
LOGP(DPAG, LOGL_INFO, " TMSI %08x matches\n", ntohl(pa->tmsi4));
return gsm48_rr_chan_req(ms, gsm48_rr_chan2cause[chan_4], 1,
GSM_MI_TYPE_TMSI);
} else
LOGP(DPAG, LOGL_INFO, " TMSI %08x (not for us)\n",
ntohl(pa->tmsi4));
return 0;
}
/*
* (immediate) assignment
*/
/* match request reference against request history */
static int gsm48_match_ra(struct osmocom_ms *ms, struct gsm48_req_ref *ref)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
int i;
uint8_t ia_t1, ia_t2, ia_t3;
uint8_t cr_t1, cr_t2, cr_t3;
for (i = 0; i < 3; i++) {
/* filter confirmed RACH requests only */
if (rr->cr_hist[i].valid && ref->ra == rr->cr_hist[i].ref.ra) {
ia_t1 = ref->t1;
ia_t2 = ref->t2;
ia_t3 = (ref->t3_high << 3) | ref->t3_low;
ref = &rr->cr_hist[i].ref;
cr_t1 = ref->t1;
cr_t2 = ref->t2;
cr_t3 = (ref->t3_high << 3) | ref->t3_low;
if (ia_t1 == cr_t1 && ia_t2 == cr_t2
&& ia_t3 == cr_t3) {
LOGP(DRR, LOGL_INFO, "request %02x matches "
"(fn=%d,%d,%d)\n", ref->ra, ia_t1,
ia_t2, ia_t3);
return 1;
} else
LOGP(DRR, LOGL_INFO, "request %02x matches "
"but not frame number (IMM.ASS "
"fn=%d,%d,%d != RACH fn=%d,%d,%d)\n",
ref->ra, ia_t1, ia_t2, ia_t3,
cr_t1, cr_t2, cr_t3);
}
}
return 0;
}
/* 9.1.18 IMMEDIATE ASSIGNMENT is received */
static int gsm48_rr_rx_imm_ass(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_imm_ass *ia = msgb_l3(msg);
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
int ma_len = msgb_l3len(msg) - sizeof(*ia);
uint8_t ch_type, ch_subch, ch_ts;
struct gsm48_rr_cd cd;
#ifndef TEST_STARTING_TIMER
uint8_t *st, st_len;
#endif
/* ignore imm.ass. while not camping on a cell */
if (!cs->selected || cs->neighbour || !s) {
LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT ignored, we are "
"have not proper selected the serving cell.\n");
return 0;
}
memset(&cd, 0, sizeof(cd));
cd.ind_tx_power = rr->cd_now.ind_tx_power;
if (ma_len < 0 /* mobile allocation IE must be included */
|| ia->mob_alloc_len > ma_len) { /* short read of IE */
LOGP(DRR, LOGL_NOTICE, "Short read of IMMEDIATE ASSIGNMENT "
"message.\n");
return -EINVAL;
}
if (ia->mob_alloc_len > 8) {
LOGP(DRR, LOGL_NOTICE, "Moble allocation in IMMEDIATE "
"ASSIGNMENT too large.\n");
return -EINVAL;
}
/* starting time */
#ifdef TEST_STARTING_TIMER
cd.start = 1;
cd.start_tm.fn = (ms->meas.last_fn + TEST_STARTING_TIMER) % 42432;
LOGP(DRR, LOGL_INFO, " TESTING: starting time ahead\n");
#else
st_len = ma_len - ia->mob_alloc_len;
st = ia->mob_alloc + ia->mob_alloc_len;
if (st_len >= 3 && st[0] == GSM48_IE_START_TIME)
gsm48_decode_start_time(&cd, (struct gsm48_start_time *)(st+1));
#endif
/* decode channel description */
LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT:\n");
cd.chan_nr = ia->chan_desc.chan_nr;
rsl_dec_chan_nr(cd.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ia->chan_desc.h0.h) {
cd.h = 1;
gsm48_decode_chan_h1(&ia->chan_desc, &cd.tsc, &cd.maio,
&cd.hsn);
LOGP(DRR, LOGL_INFO, " (ta %d/%dm ra 0x%02x chan_nr 0x%02x "
"MAIO %u HSN %u TS %u SS %u TSC %u)\n",
ia->timing_advance,
ia->timing_advance * GSM_TA_CM / 100,
ia->req_ref.ra, ia->chan_desc.chan_nr, cd.maio,
cd.hsn, ch_ts, ch_subch, cd.tsc);
} else {
cd.h = 0;
gsm48_decode_chan_h0(&ia->chan_desc, &cd.tsc, &cd.arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cd.arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " (ta %d/%dm ra 0x%02x chan_nr 0x%02x "
"ARFCN %s TS %u SS %u TSC %u)\n",
ia->timing_advance,
ia->timing_advance * GSM_TA_CM / 100,
ia->req_ref.ra, ia->chan_desc.chan_nr,
gsm_print_arfcn(cd.arfcn), ch_ts, ch_subch, cd.tsc);
}
/* 3.3.1.1.2: ignore assignment while idle */
if (rr->state != GSM48_RR_ST_CONN_PEND || rr->wait_assign == 0) {
LOGP(DRR, LOGL_INFO, "Not for us, no request.\n");
return 0;
}
if (rr->wait_assign == 2) {
LOGP(DRR, LOGL_INFO, "Ignoring, channel already assigned.\n");
return 0;
}
/* request ref */
if (gsm48_match_ra(ms, &ia->req_ref)) {
/* channel description */
memcpy(&rr->cd_now, &cd, sizeof(rr->cd_now));
/* timing advance */
rr->cd_now.ind_ta = ia->timing_advance;
/* mobile allocation */
memcpy(&rr->cd_now.mob_alloc_lv, &ia->mob_alloc_len,
ia->mob_alloc_len + 1);
rr->wait_assign = 2;
/* reset scheduler */
LOGP(DRR, LOGL_INFO, "resetting scheduler\n");
l1ctl_tx_reset_req(ms, L1CTL_RES_T_SCHED);
return gsm48_rr_dl_est(ms);
}
LOGP(DRR, LOGL_INFO, "Request, but not for us.\n");
return 0;
}
/* 9.1.19 IMMEDIATE ASSIGNMENT EXTENDED is received */
static int gsm48_rr_rx_imm_ass_ext(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm48_imm_ass_ext *ia = msgb_l3(msg);
int ma_len = msgb_l3len(msg) - sizeof(*ia);
uint8_t ch_type, ch_subch, ch_ts;
struct gsm48_rr_cd cd1, cd2;
#ifndef TEST_STARTING_TIMER
uint8_t *st, st_len;
#endif
/* ignore imm.ass.ext while not camping on a cell */
if (!cs->selected || cs->neighbour || !s) {
LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT ignored, we are "
"have not proper selected the serving cell.\n");
return 0;
}
memset(&cd1, 0, sizeof(cd1));
cd1.ind_tx_power = rr->cd_now.ind_tx_power;
memset(&cd2, 0, sizeof(cd2));
cd2.ind_tx_power = rr->cd_now.ind_tx_power;
if (ma_len < 0 /* mobile allocation IE must be included */
|| ia->mob_alloc_len > ma_len) { /* short read of IE */
LOGP(DRR, LOGL_NOTICE, "Short read of IMMEDIATE ASSIGNMENT "
"EXTENDED message.\n");
return -EINVAL;
}
if (ia->mob_alloc_len > 4) {
LOGP(DRR, LOGL_NOTICE, "Moble allocation in IMMEDIATE "
"ASSIGNMENT EXTENDED too large.\n");
return -EINVAL;
}
#ifdef TEST_STARTING_TIMER
cd1.start = 1;
cd2.start_tm.fn = (ms->meas.last_fn + TEST_STARTING_TIMER) % 42432;
memcpy(&cd2, &cd1, sizeof(cd2));
LOGP(DRR, LOGL_INFO, " TESTING: starting time ahead\n");
#else
/* starting time */
st_len = ma_len - ia->mob_alloc_len;
st = ia->mob_alloc + ia->mob_alloc_len;
if (st_len >= 3 && st[0] == GSM48_IE_START_TIME) {
gsm48_decode_start_time(&cd1,
(struct gsm48_start_time *)(st+1));
memcpy(&cd2, &cd1, sizeof(cd2));
}
#endif
/* decode channel description */
LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT EXTENDED:\n");
cd1.chan_nr = ia->chan_desc1.chan_nr;
rsl_dec_chan_nr(cd1.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ia->chan_desc1.h0.h) {
cd1.h = 1;
gsm48_decode_chan_h1(&ia->chan_desc1, &cd1.tsc, &cd1.maio,
&cd1.hsn);
LOGP(DRR, LOGL_INFO, " assignment 1 (ta %d/%dm ra 0x%02x "
"chan_nr 0x%02x MAIO %u HSN %u TS %u SS %u TSC %u)\n",
ia->timing_advance1,
ia->timing_advance1 * GSM_TA_CM / 100,
ia->req_ref1.ra, ia->chan_desc1.chan_nr, cd1.maio,
cd1.hsn, ch_ts, ch_subch, cd1.tsc);
} else {
cd1.h = 0;
gsm48_decode_chan_h0(&ia->chan_desc1, &cd1.tsc, &cd1.arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cd1.arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " assignment 1 (ta %d/%dm ra 0x%02x "
"chan_nr 0x%02x ARFCN %s TS %u SS %u TSC %u)\n",
ia->timing_advance1,
ia->timing_advance1 * GSM_TA_CM / 100,
ia->req_ref1.ra, ia->chan_desc1.chan_nr,
gsm_print_arfcn(cd1.arfcn), ch_ts, ch_subch, cd1.tsc);
}
cd2.chan_nr = ia->chan_desc2.chan_nr;
rsl_dec_chan_nr(cd2.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ia->chan_desc2.h0.h) {
cd2.h = 1;
gsm48_decode_chan_h1(&ia->chan_desc2, &cd2.tsc, &cd2.maio,
&cd2.hsn);
LOGP(DRR, LOGL_INFO, " assignment 2 (ta %d/%dm ra 0x%02x "
"chan_nr 0x%02x MAIO %u HSN %u TS %u SS %u TSC %u)\n",
ia->timing_advance2,
ia->timing_advance2 * GSM_TA_CM / 100,
ia->req_ref2.ra, ia->chan_desc2.chan_nr, cd2.maio,
cd2.hsn, ch_ts, ch_subch, cd2.tsc);
} else {
cd2.h = 0;
gsm48_decode_chan_h0(&ia->chan_desc2, &cd2.tsc, &cd2.arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cd2.arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " assignment 2 (ta %d/%dm ra 0x%02x "
"chan_nr 0x%02x ARFCN %s TS %u SS %u TSC %u)\n",
ia->timing_advance2,
ia->timing_advance2 * GSM_TA_CM / 100,
ia->req_ref2.ra, ia->chan_desc2.chan_nr,
gsm_print_arfcn(cd2.arfcn), ch_ts, ch_subch, cd2.tsc);
}
/* 3.3.1.1.2: ignore assignment while idle */
if (rr->state != GSM48_RR_ST_CONN_PEND || rr->wait_assign == 0) {
LOGP(DRR, LOGL_INFO, "Not for us, no request.\n");
return 0;
}
if (rr->wait_assign == 2) {
LOGP(DRR, LOGL_INFO, "Ignoring, channel already assigned.\n");
return 0;
}
/* request ref 1 */
if (gsm48_match_ra(ms, &ia->req_ref1)) {
/* channel description */
memcpy(&rr->cd_now, &cd1, sizeof(rr->cd_now));
/* timing advance */
rr->cd_now.ind_ta = ia->timing_advance1;
/* mobile allocation */
memcpy(&rr->cd_now.mob_alloc_lv, &ia->mob_alloc_len,
ia->mob_alloc_len + 1);
rr->wait_assign = 2;
/* reset scheduler */
LOGP(DRR, LOGL_INFO, "resetting scheduler\n");
l1ctl_tx_reset_req(ms, L1CTL_RES_T_SCHED);
return gsm48_rr_dl_est(ms);
}
/* request ref 2 */
if (gsm48_match_ra(ms, &ia->req_ref2)) {
/* channel description */
memcpy(&rr->cd_now, &cd2, sizeof(rr->cd_now));
/* timing advance */
rr->cd_now.ind_ta = ia->timing_advance2;
/* mobile allocation */
memcpy(&rr->cd_now.mob_alloc_lv, &ia->mob_alloc_len,
ia->mob_alloc_len + 1);
rr->wait_assign = 2;
/* reset scheduler */
LOGP(DRR, LOGL_INFO, "resetting scheduler\n");
l1ctl_tx_reset_req(ms, L1CTL_RES_T_SCHED);
return gsm48_rr_dl_est(ms);
}
LOGP(DRR, LOGL_INFO, "Request, but not for us.\n");
return 0;
}
/* 9.1.20 IMMEDIATE ASSIGNMENT REJECT is received */
static int gsm48_rr_rx_imm_ass_rej(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_imm_ass_rej *ia = msgb_l3(msg);
int payload_len = msgb_l3len(msg) - sizeof(*ia);
int i;
struct gsm48_req_ref *req_ref;
uint8_t t3122_value;
/* 3.3.1.1.2: ignore assignment while idle */
if (rr->state != GSM48_RR_ST_CONN_PEND || rr->wait_assign == 0)
return 0;
if (rr->wait_assign == 2) {
return 0;
}
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of IMMEDIATE ASSIGNMENT "
"REJECT message.\n");
return -EINVAL;
}
for (i = 0; i < 4; i++) {
/* request reference */
req_ref = (struct gsm48_req_ref *)
(((uint8_t *)&ia->req_ref1) + i * 4);
LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT REJECT "
"(ref 0x%02x)\n", req_ref->ra);
if (gsm48_match_ra(ms, req_ref)) {
/* wait indication */
t3122_value = *(((uint8_t *)&ia->wait_ind1) + i * 4);
if (t3122_value)
start_rr_t3122(rr, t3122_value, 0);
/* start timer 3126 if not already */
if (!osmo_timer_pending(&rr->t3126))
start_rr_t3126(rr, 5, 0); /* TODO improve! */
/* stop assignment requests */
rr->n_chan_req = 0;
/* wait until timer 3126 expires, then release
* or wait for channel assignment */
return 0;
}
}
return 0;
}
/* 9.1.1 ADDITIONAL ASSIGNMENT is received */
static int gsm48_rr_rx_add_ass(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_add_ass *aa = (struct gsm48_add_ass *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*aa);
struct tlv_parsed tp;
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of ADDITIONAL ASSIGNMENT "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
tlv_parse(&tp, &gsm48_rr_att_tlvdef, aa->data, payload_len, 0, 0);
return gsm48_rr_tx_rr_status(ms, GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/*
* measturement reports
*/
static int gsm48_rr_tx_meas_rep(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_sysinfo *s = ms->cellsel.si;
struct rx_meas_stat *meas = &rr->ms->meas;
struct gsm48_rr_meas *rrmeas = &rr->meas;
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_meas_res *mr;
uint8_t serv_rxlev_full = 0, serv_rxlev_sub = 0, serv_rxqual_full = 0,
serv_rxqual_sub = 0;
uint8_t ta, tx_power;
uint8_t rep_ba = 0, rep_valid = 0, meas_valid = 0;
uint8_t n = 0, rxlev_nc[6], bsic_nc[6], bcch_f_nc[6];
/* just in case! */
if (!s)
return -EINVAL;
/* check if SI5* is completely received, check BA-IND */
if (s->si5
&& (!s->nb_ext_ind_si5 || s->si5bis)) {
rep_ba = s->nb_ba_ind_si5;
if ((s->si5bis && s->nb_ext_ind_si5
&& s->nb_ba_ind_si5bis != rep_ba)
|| (s->si5ter && s->nb_ba_ind_si5ter != rep_ba)) {
LOGP(DRR, LOGL_NOTICE, "BA-IND mismatch on SI5*");
} else
rep_valid = 1;
}
/* check for valid measurements, any frame must exist */
if (meas->frames) {
meas_valid = 1;
serv_rxlev_full = serv_rxlev_sub =
(meas->rxlev + (meas->frames / 2)) / meas->frames;
serv_rxqual_full = serv_rxqual_sub = 0; // FIXME
}
memset(&rxlev_nc, 0, sizeof(rxlev_nc));
memset(&bsic_nc, 0, sizeof(bsic_nc));
memset(&bcch_f_nc, 0, sizeof(bcch_f_nc));
if (rep_valid) {
int8_t strongest, current;
uint8_t ncc;
int i, index;
#if 0
/* FIXME: multi-band reporting, if not: 0 = normal reporting */
uint8_t multi_rep = s->si5ter ?
s->nb_multi_rep_si5ter : 0;
#endif
/* get 6 strongest measurements */
strongest = 127; /* infinite */
for (n = 0; n < 6; n++) {
current = -128; /* -infinite */
index = 0;
for (i = 0; i < rrmeas->nc_num; i++) {
/* only check if NCC is permitted */
ncc = rrmeas->nc_bsic[i] >> 3;
if ((s->nb_ncc_permitted_si6 & (1 << ncc))
&& rrmeas->nc_rxlev_dbm[i] > current
&& rrmeas->nc_rxlev_dbm[i] < strongest) {
current = rrmeas->nc_rxlev_dbm[i];
index = i;
}
}
if (current == -128) /* no more found */
break;
rxlev_nc[n] = rrmeas->nc_rxlev_dbm[index] + 110;
bsic_nc[n] = rrmeas->nc_bsic[index];
bcch_f_nc[n] = index;
}
}
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
/* use indicated tx-power and TA (not the altered ones) */
tx_power = rr->cd_now.ind_tx_power;
// FIXME: degrade power to the max supported level
ta = rr->cd_now.ind_ta;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
mr = (struct gsm48_meas_res *) msgb_put(nmsg, sizeof(*mr));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_MEAS_REP;
/* measurement results */
mr->rxlev_full = serv_rxlev_full;
mr->rxlev_sub = serv_rxlev_sub;
mr->rxqual_full = serv_rxqual_full;
mr->rxqual_sub = serv_rxqual_sub;
mr->dtx_used = 0; // FIXME: no DTX yet
mr->ba_used = rep_ba;
mr->meas_valid = !meas_valid; /* 0 = valid */
if (rep_valid) {
mr->no_nc_n_hi = n >> 2;
mr->no_nc_n_lo = n & 3;
} else {
/* no results for serving cells */
mr->no_nc_n_hi = 1;
mr->no_nc_n_lo = 3;
}
mr->rxlev_nc1 = rxlev_nc[0];
mr->rxlev_nc2_hi = rxlev_nc[1] >> 1;
mr->rxlev_nc2_lo = rxlev_nc[1] & 1;
mr->rxlev_nc3_hi = rxlev_nc[2] >> 2;
mr->rxlev_nc3_lo = rxlev_nc[2] & 3;
mr->rxlev_nc4_hi = rxlev_nc[3] >> 3;
mr->rxlev_nc4_lo = rxlev_nc[3] & 7;
mr->rxlev_nc5_hi = rxlev_nc[4] >> 4;
mr->rxlev_nc5_lo = rxlev_nc[4] & 15;
mr->rxlev_nc6_hi = rxlev_nc[5] >> 5;
mr->rxlev_nc6_lo = rxlev_nc[5] & 31;
mr->bsic_nc1_hi = bsic_nc[0] >> 3;
mr->bsic_nc1_lo = bsic_nc[0] & 7;
mr->bsic_nc2_hi = bsic_nc[1] >> 4;
mr->bsic_nc2_lo = bsic_nc[1] & 15;
mr->bsic_nc3_hi = bsic_nc[2] >> 5;
mr->bsic_nc3_lo = bsic_nc[2] & 31;
mr->bsic_nc4 = bsic_nc[3];
mr->bsic_nc5 = bsic_nc[4];
mr->bsic_nc6 = bsic_nc[5];
mr->bcch_f_nc1 = bcch_f_nc[0];
mr->bcch_f_nc2 = bcch_f_nc[1];
mr->bcch_f_nc3 = bcch_f_nc[2];
mr->bcch_f_nc4 = bcch_f_nc[3];
mr->bcch_f_nc5_hi = bcch_f_nc[4] >> 1;
mr->bcch_f_nc5_lo = bcch_f_nc[4] & 1;
mr->bcch_f_nc6_hi = bcch_f_nc[5] >> 2;
mr->bcch_f_nc6_lo = bcch_f_nc[5] & 3;
LOGP(DRR, LOGL_INFO, "MEAS REP: pwr=%d TA=%d meas-invalid=%d "
"rxlev-full=%d rxlev-sub=%d rxqual-full=%d rxqual-sub=%d "
"dtx %d ba %d no-ncell-n %d\n", tx_power, ta, mr->meas_valid,
mr->rxlev_full - 110, mr->rxlev_sub - 110,
mr->rxqual_full, mr->rxqual_sub, mr->dtx_used, mr->ba_used,
(mr->no_nc_n_hi << 2) | mr->no_nc_n_lo);
msgb_tv16_push(nmsg, RSL_IE_L3_INFO,
nmsg->tail - (uint8_t *)msgb_l3(nmsg));
msgb_push(nmsg, 2 + 2);
nmsg->data[0] = RSL_IE_TIMING_ADVANCE;
nmsg->data[1] = ta;
nmsg->data[2] = RSL_IE_MS_POWER;
nmsg->data[3] = tx_power;
rsl_rll_push_hdr(nmsg, RSL_MT_UNIT_DATA_REQ, rr->cd_now.chan_nr,
0x40, 1);
return lapdm_rslms_recvmsg(nmsg, &ms->lapdm_channel);
}
/*
* link establishment and release
*/
/* process "Loss Of Signal" */
int gsm48_rr_los(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t *mode;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
LOGP(DSUM, LOGL_INFO, "Radio link lost signal\n");
/* stop T3211 if running */
stop_rr_t3110(rr);
switch(rr->state) {
case GSM48_RR_ST_CONN_PEND:
LOGP(DRR, LOGL_INFO, "LOS during RACH request\n");
/* stop pending RACH timer */
stop_rr_t3126(rr);
break;
case GSM48_RR_ST_DEDICATED:
LOGP(DRR, LOGL_INFO, "LOS during dedicated mode, release "
"locally\n");
new_rr_state(rr, GSM48_RR_ST_REL_PEND);
/* release message */
rel_local:
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 1; /* local release */
/* start release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, 0);
/* release SAPI 3 link, if exits */
gsm48_release_sapi3_link(ms);
return 0;
case GSM48_RR_ST_REL_PEND:
LOGP(DRR, LOGL_INFO, "LOS during RR release procedure, release "
"locally\n");
/* stop pending RACH timer */
stop_rr_t3110(rr);
/* release locally */
goto rel_local;
default:
/* this should not happen */
LOGP(DRR, LOGL_ERROR, "LOS in IDLE state, ignoring\n");
return -EINVAL;
}
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_LOST_SIGNAL;
gsm48_rr_upmsg(ms, nmsg);
/* return idle */
new_rr_state(rr, GSM48_RR_ST_IDLE);
return 0;
}
/* activation of channel in dedicated mode */
static int gsm48_rr_activate_channel(struct osmocom_ms *ms,
struct gsm48_rr_cd *cd, uint16_t *ma, uint8_t ma_len)
{
struct gsm_subscriber *subscr = &ms->subscr;
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm_settings *set = &ms->settings;
struct gsm48_sysinfo *s = ms->cellsel.si;
struct rx_meas_stat *meas = &ms->meas;
uint8_t ch_type, ch_subch, ch_ts;
uint8_t timeout = 64;
/* setting (new) timing advance */
LOGP(DRR, LOGL_INFO, "setting indicated TA %d (actual TA %d)\n",
cd->ind_ta, cd->ind_ta - set->alter_delay);
l1ctl_tx_param_req(ms, cd->ind_ta - set->alter_delay,
(set->alter_tx_power) ? set->alter_tx_power_value
: cd->ind_tx_power);
/* reset measurement and link timeout */
meas->ds_fail = 0;
if (s) {
if (s->sacch_radio_link_timeout) {
timeout = s->sacch_radio_link_timeout;
LOGP(DRR, LOGL_INFO, "using last SACCH timeout %d\n",
timeout);
} else if (s->bcch_radio_link_timeout) {
timeout = s->bcch_radio_link_timeout;
LOGP(DRR, LOGL_INFO, "using last BCCH timeout %d\n",
timeout);
}
}
meas->rl_fail = meas->s = timeout;
/* setting initial (invalid) measurement report, resetting SI5* */
if (s) {
memset(s->si5_msg, 0, sizeof(s->si5_msg));
memset(s->si5b_msg, 0, sizeof(s->si5b_msg));
memset(s->si5t_msg, 0, sizeof(s->si5t_msg));
}
meas->frames = meas->snr = meas->berr = meas->rxlev = 0;
rr->meas.nc_num = 0;
stop_rr_t_meas(rr);
start_rr_t_meas(rr, 1, 0);
gsm48_rr_tx_meas_rep(ms);
/* establish */
LOGP(DRR, LOGL_INFO, "establishing channel in dedicated mode\n");
rsl_dec_chan_nr(cd->chan_nr, &ch_type, &ch_subch, &ch_ts);
LOGP(DRR, LOGL_INFO, " Channel type %d, subch %d, ts %d, mode %d, "
"audio-mode %d, cipher %d\n", ch_type, ch_subch, ch_ts,
cd->mode, rr->audio_mode, rr->cipher_type + 1);
if (cd->h)
l1ctl_tx_dm_est_req_h1(ms, cd->maio, cd->hsn,
ma, ma_len, cd->chan_nr, cd->tsc, cd->mode,
rr->audio_mode);
else
l1ctl_tx_dm_est_req_h0(ms, cd->arfcn, cd->chan_nr, cd->tsc,
cd->mode, rr->audio_mode);
rr->dm_est = 1;
/* old SI 5/6 are not valid on a new dedicated channel */
s->si5 = s->si5bis = s->si5ter = s->si6 = 0;
if (rr->cipher_on)
l1ctl_tx_crypto_req(ms, rr->cd_now.chan_nr,
rr->cipher_type + 1, subscr->key, 8);
return 0;
}
/* frequency change of channel "after time" */
static int gsm48_rr_channel_after_time(struct osmocom_ms *ms,
struct gsm48_rr_cd *cd, uint16_t *ma, uint8_t ma_len, uint16_t fn)
{
struct gsm_subscriber *subscr = &ms->subscr;
struct gsm48_rrlayer *rr = &ms->rrlayer;
if (cd->h)
l1ctl_tx_dm_freq_req_h1(ms, cd->maio, cd->hsn,
ma, ma_len, cd->tsc, fn);
else
l1ctl_tx_dm_freq_req_h0(ms, cd->arfcn, cd->tsc, fn);
if (rr->cipher_on)
l1ctl_tx_crypto_req(ms, rr->cd_now.chan_nr,
rr->cipher_type + 1, subscr->key, 8);
gsm48_rr_set_mode(ms, cd->chan_nr, cd->mode);
return 0;
}
/* render list of hopping channels from channel description elements */
static int gsm48_rr_render_ma(struct osmocom_ms *ms, struct gsm48_rr_cd *cd,
uint16_t *ma, uint8_t *ma_len)
{
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm_settings *set = &ms->settings;
int i, pcs, index;
uint16_t arfcn;
pcs = gsm_refer_pcs(cs->arfcn, s) ? ARFCN_PCS : 0;
/* no hopping (no MA), channel description is valid */
if (!cd->h) {
*ma_len = 0;
return 0;
}
/* decode mobile allocation */
if (cd->mob_alloc_lv[0]) {
struct gsm_sysinfo_freq *freq = s->freq;
LOGP(DRR, LOGL_INFO, "decoding mobile allocation\n");
if (cd->cell_desc_lv[0]) {
LOGP(DRR, LOGL_INFO, "using cell channel descr.\n");
if (cd->cell_desc_lv[0] != 16) {
LOGP(DRR, LOGL_ERROR, "cell channel descr. "
"has invalid length\n");
return GSM48_RR_CAUSE_ABNORMAL_UNSPEC;
}
gsm48_decode_freq_list(freq, cd->cell_desc_lv + 1, 16,
0xce, FREQ_TYPE_SERV);
}
gsm48_decode_mobile_alloc(freq, cd->mob_alloc_lv + 1,
cd->mob_alloc_lv[0], ma, ma_len, 0);
if (*ma_len < 1) {
LOGP(DRR, LOGL_NOTICE, "mobile allocation with no "
"frequency available\n");
return GSM48_RR_CAUSE_NO_CELL_ALLOC_A;
}
} else
/* decode frequency list */
if (cd->freq_list_lv[0]) {
struct gsm_sysinfo_freq f[1024];
int j = 0;
LOGP(DRR, LOGL_INFO, "decoding frequency list\n");
/* get bitmap */
if (gsm48_decode_freq_list(f, cd->freq_list_lv + 1,
cd->freq_list_lv[0], 0xce, FREQ_TYPE_SERV)) {
LOGP(DRR, LOGL_NOTICE, "frequency list invalid\n");
return GSM48_RR_CAUSE_ABNORMAL_UNSPEC;
}
/* collect channels from bitmap (1..1023,0) */
for (i = 1; i <= 1024; i++) {
if ((f[i & 1023].mask & FREQ_TYPE_SERV)) {
LOGP(DRR, LOGL_INFO, "Listed ARFCN #%d: %s\n",
j, gsm_print_arfcn((i & 1023) | pcs));
if (j == 64) {
LOGP(DRR, LOGL_NOTICE, "frequency list "
"exceeds 64 entries!\n");
return GSM48_RR_CAUSE_ABNORMAL_UNSPEC;
}
ma[j++] = i & 1023;
}
}
*ma_len = j;
} else
/* decode frequency channel sequence */
if (cd->freq_seq_lv[0]) {
int j = 0, inc;
LOGP(DRR, LOGL_INFO, "decoding frequency channel sequence\n");
if (cd->freq_seq_lv[0] != 9) {
LOGP(DRR, LOGL_NOTICE, "invalid frequency channel "
"sequence\n");
return GSM48_RR_CAUSE_ABNORMAL_UNSPEC;
}
arfcn = cd->freq_seq_lv[1] & 0x7f;
LOGP(DRR, LOGL_INFO, "Listed Sequence ARFCN #%d: %s\n", j,
gsm_print_arfcn(arfcn | pcs));
ma[j++] = arfcn;
for (i = 0; i < 16; i++) {
if ((i & 1))
inc = cd->freq_seq_lv[2 + (i >> 1)] & 0x0f;
else
inc = cd->freq_seq_lv[2 + (i >> 1)] >> 4;
if (inc) {
arfcn += inc;
LOGP(DRR, LOGL_INFO, "Listed Sequence ARFCN "
"#%d: %s\n", j,
gsm_print_arfcn(i | pcs));
ma[j++] = arfcn;
} else
arfcn += 15;
}
*ma_len = j;
} else {
LOGP(DRR, LOGL_NOTICE, "hopping, but nothing that tells us "
"a sequence\n");
return GSM48_RR_CAUSE_ABNORMAL_UNSPEC;
}
/* convert to band_arfcn and check for unsported frequency */
for (i = 0; i < *ma_len; i++) {
arfcn = ma[i] | pcs;
ma[i] = arfcn;
index = arfcn2index(arfcn);
if (!(set->freq_map[index >> 3] & (1 << (index & 7)))) {
LOGP(DRR, LOGL_NOTICE, "Hopping ARFCN %s not "
"supported\n", gsm_print_arfcn(arfcn));
return GSM48_RR_CAUSE_FREQ_NOT_IMPL;
}
}
return 0;
}
/* activate link and send establish request */
static int gsm48_rr_dl_est(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm_subscriber *subscr = &ms->subscr;
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_pag_rsp *pr;
uint8_t mi[11];
uint16_t ma[64];
uint8_t ma_len;
/* 3.3.1.1.3.1 */
stop_rr_t3126(rr);
/* check if we have to change channel at starting time (we delay) */
if (rr->cd_now.start) {
int32_t now, start, diff;
uint32_t start_mili = 0;
/* how much time do we have left? */
now = ms->meas.last_fn % 42432;
start = rr->cd_now.start_tm.fn % 42432;
diff = start - now;
if (diff < 0)
diff += 42432;
LOGP(DRR, LOGL_INFO, " (Tnow %d Tstart %d diff %d)\n",
now, start, diff);
start_mili = (uint32_t)diff * 19580 / 42432 * 10;
if (diff >= 32024 || !start_mili) {
LOGP(DRR, LOGL_INFO, " -> Start time already "
"elapsed\n");
rr->cd_now.start = 0;
} else {
LOGP(DRR, LOGL_INFO, " -> Start time is %d ms in the "
"future\n", start_mili);
}
#ifndef TEST_FREQUENCY_MOD
/* schedule start of IMM.ASS */
rr->modify_state = GSM48_RR_MOD_IMM_ASS;
start_rr_t_starting(rr, start_mili / 1000,
(start_mili % 1000) * 1000);
/* when timer fires, start time is already elapsed */
rr->cd_now.start = 0;
return 0;
#endif
}
/* get hopping sequence, if required */
if (gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len))
return -EINVAL;
/* clear all sequence numbers for all possible PDs */
rr->v_sd = 0;
/* send DL_EST_REQ */
if (rr->rr_est_msg) {
LOGP(DRR, LOGL_INFO, "sending establish message\n");
/* use queued message */
nmsg = rr->rr_est_msg;
rr->rr_est_msg = 0;
/* set sequence number and increment */
gsm48_apply_v_sd(rr, nmsg);
} else {
/* create paging response */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_PAG_RESP;
pr = (struct gsm48_pag_rsp *) msgb_put(nmsg, sizeof(*pr));
/* key sequence */
pr->key_seq = gsm_subscr_get_key_seq(ms, subscr);
/* classmark 2 */
pr->cm2_len = sizeof(pr->cm2);
gsm48_rr_enc_cm2(ms, &pr->cm2, rr->cd_now.arfcn);
/* mobile identity */
if (ms->subscr.tmsi != 0xffffffff
&& ms->subscr.mcc == cs->sel_mcc
&& ms->subscr.mnc == cs->sel_mnc
&& ms->subscr.lac == cs->sel_lac
&& rr->paging_mi_type == GSM_MI_TYPE_TMSI) {
gsm48_generate_mid_from_tmsi(mi, subscr->tmsi);
LOGP(DRR, LOGL_INFO, "sending paging response with "
"TMSI\n");
} else if (subscr->imsi[0]) {
gsm48_generate_mid_from_imsi(mi, subscr->imsi);
LOGP(DRR, LOGL_INFO, "sending paging response with "
"IMSI\n");
} else {
mi[1] = 1;
mi[2] = 0xf0 | GSM_MI_TYPE_NONE;
LOGP(DRR, LOGL_INFO, "sending paging response without "
"TMSI/IMSI\n");
}
msgb_put(nmsg, 1 + mi[1]);
memcpy(pr->data, mi + 1, 1 + mi[1]);
}
#ifdef TEST_FREQUENCY_MOD
LOGP(DRR, LOGL_INFO, " TESTING: frequency modify IMM.ASS\n");
memcpy(&rr->cd_before, &rr->cd_now, sizeof(rr->cd_before));
rr->cd_before.h = 0;
rr->cd_before.arfcn = 0;
/* activate channel */
gsm48_rr_activate_channel(ms, &rr->cd_before, ma, ma_len);
/* render channel "after time" */
gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len);
/* schedule change of channel */
gsm48_rr_channel_after_time(ms, &rr->cd_now, ma, ma_len,
rr->cd_now.start_tm.fn);
#else
/* activate channel */
gsm48_rr_activate_channel(ms, &rr->cd_now, ma, ma_len);
#endif
/* set T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec = 0;
/* start establishmnet */
return gsm48_send_rsl(ms, RSL_MT_EST_REQ, nmsg, 0);
}
/* the link is established */
static int gsm48_rr_estab_cnf(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm_support *sup = &ms->support;
struct gsm322_cellsel *cs = &ms->cellsel;
uint8_t *mode;
struct msgb *nmsg;
/* if MM has releases before confirm, we start release */
if (rr->state == GSM48_RR_ST_REL_PEND) {
LOGP(DRR, LOGL_INFO, "MM already released RR.\n");
/* release message */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 0; /* normal release */
/* start release */
return gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, 0);
}
/* 3.3.1.1.4 */
new_rr_state(rr, GSM48_RR_ST_DEDICATED);
/* early classmark sending */
if (cs->si->ecsm && sup->es_ind)
gsm48_rr_tx_cm_change(ms);
/* send confirm to upper layer */
nmsg = gsm48_rr_msgb_alloc(
(rr->rr_est_req) ? GSM48_RR_EST_CNF : GSM48_RR_EST_IND);
if (!nmsg)
return -ENOMEM;
return gsm48_rr_upmsg(ms, nmsg);
}
/* the link is released in pending state (by l2) */
static int gsm48_rr_rel_ind(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
/* switch back to old channel, if modify/ho failed */
switch (rr->modify_state) {
case GSM48_RR_MOD_ASSIGN:
case GSM48_RR_MOD_HANDO:
/* channel is deactivate there */
return gsm48_rr_rel_cnf(ms, msg);
case GSM48_RR_MOD_ASSIGN_RESUME:
case GSM48_RR_MOD_HANDO_RESUME:
rr->modify_state = GSM48_RR_MOD_NONE;
break;
}
LOGP(DSUM, LOGL_INFO, "Radio link is released\n");
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_NORMAL;
gsm48_rr_upmsg(ms, nmsg);
/* start release timer, so UA will be transmitted */
start_rr_t_rel_wait(rr, 1, 500000);
/* pending release */
new_rr_state(rr, GSM48_RR_ST_REL_PEND);
/* also release SAPI 3 link, if exists */
gsm48_release_sapi3_link(ms);
return 0;
}
/* 9.1.7 CHANNEL RELEASE is received */
static int gsm48_rr_rx_chan_rel(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_chan_rel *cr = (struct gsm48_chan_rel *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*cr);
struct tlv_parsed tp;
struct msgb *nmsg;
uint8_t *mode;
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of CHANNEL RELEASE "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
tlv_parse(&tp, &gsm48_rr_att_tlvdef, cr->data, payload_len, 0, 0);
LOGP(DRR, LOGL_INFO, "channel release request with cause 0x%02x\n",
cr->rr_cause);
/* BA range */
if (TLVP_PRESENT(&tp, GSM48_IE_BA_RANGE)) {
gsm48_decode_ba_range(TLVP_VAL(&tp, GSM48_IE_BA_RANGE),
*(TLVP_VAL(&tp, GSM48_IE_BA_RANGE) - 1), rr->ba_range,
&rr->ba_ranges,
sizeof(rr->ba_range) / sizeof(rr->ba_range[0]));
/* NOTE: the ranges are kept until IDLE state is returned
* (see new_rr_state)
*/
}
new_rr_state(rr, GSM48_RR_ST_REL_PEND);
/* start T3110, so that two DISCs can be sent due to T200 timeout */
start_rr_t3110(rr, 1, 500000);
/* disconnect the main signalling link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 0; /* normal release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, 0);
/* release SAPI 3 link, if exits */
gsm48_release_sapi3_link(ms);
return 0;
}
/*
* frequency redefition, channel mode modify, assignment, and handover
*/
/* set channel mode in case of TCH */
static int gsm48_rr_set_mode(struct osmocom_ms *ms, uint8_t chan_nr,
uint8_t mode)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t ch_type, ch_subch, ch_ts;
/* only apply mode to TCH/F or TCH/H */
rsl_dec_chan_nr(chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ch_type != RSL_CHAN_Bm_ACCHs
&& ch_type != RSL_CHAN_Lm_ACCHs)
return -ENOTSUP;
/* setting (new) timing advance */
LOGP(DRR, LOGL_INFO, "setting TCH mode to %d, audio mode to %d\n",
mode, rr->audio_mode);
l1ctl_tx_tch_mode_req(ms, mode, rr->audio_mode, rr->tch_loop_mode);
return 0;
}
/* 9.1.13 FREQUENCY REDEFINITION is received */
static int gsm48_rr_rx_frq_redef(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm48_frq_redef *fr = msgb_l3(msg);
int mob_al_len = msgb_l3len(msg) - sizeof(*fr);
uint8_t ch_type, ch_subch, ch_ts;
struct gsm48_rr_cd cd;
uint8_t cause;
uint8_t *st;
uint16_t ma[64];
uint8_t ma_len;
memcpy(&cd, &rr->cd_now, sizeof(cd));
if (mob_al_len < 0 /* mobile allocation IE must be included */
|| fr->mob_alloc_len + 2 > mob_al_len) { /* short read of IE */
LOGP(DRR, LOGL_NOTICE, "Short read of FREQUENCY REDEFINITION "
"message.\n");
return -EINVAL;
}
if (fr->mob_alloc_len > 8) {
LOGP(DRR, LOGL_NOTICE, "Moble allocation in FREQUENCY "
"REDEFINITION too large.\n");
return -EINVAL;
}
/* decode channel description */
LOGP(DRR, LOGL_INFO, "FREQUENCY REDEFINITION:\n");
cd.chan_nr = fr->chan_desc.chan_nr;
rsl_dec_chan_nr(cd.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (fr->chan_desc.h0.h) {
cd.h = 1;
gsm48_decode_chan_h1(&fr->chan_desc, &cd.tsc, &cd.maio,
&cd.hsn);
LOGP(DRR, LOGL_INFO, " (MAIO %u HSN %u TS %u SS %u TSC %u)\n",
cd.maio, cd.hsn, ch_ts, ch_subch, cd.tsc);
} else {
cd.h = 0;
gsm48_decode_chan_h0(&fr->chan_desc, &cd.tsc, &cd.arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cd.arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " (ARFCN %s TS %u SS %u TSC %u)\n",
gsm_print_arfcn(cd.arfcn), ch_ts, ch_subch, cd.tsc);
}
/* mobile allocation */
memcpy(rr->cd_now.mob_alloc_lv, &fr->mob_alloc_len,
fr->mob_alloc_len + 1);
/* starting time */
st = fr->mob_alloc + fr->mob_alloc_len;
gsm48_decode_start_time(&cd, (struct gsm48_start_time *)(st+1));
/* cell channel description */
if (mob_al_len >= fr->mob_alloc_len + 2 + 17
&& fr->mob_alloc[fr->mob_alloc_len + 2] == GSM48_IE_CELL_CH_DESC) {
const uint8_t *v = fr->mob_alloc + fr->mob_alloc_len + 2 + 1;
LOGP(DRR, LOGL_INFO, " using cell channel description)\n");
cd.cell_desc_lv[0] = 16;
memcpy(cd.cell_desc_lv + 1, v, 17);
}
/* render channel "after time" */
cause = gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len);
if (cause)
return gsm48_rr_tx_rr_status(ms, cause);
/* update to new channel data */
memcpy(&rr->cd_now, &cd, sizeof(rr->cd_now));
/* schedule change of channel */
gsm48_rr_channel_after_time(ms, &rr->cd_now, ma, ma_len,
rr->cd_now.start_tm.fn);
rr->cd_now.start = 0;
return 0;
}
/* 9.1.6 sending CHANNEL MODE MODIFY ACKNOWLEDGE */
static int gsm48_rr_tx_chan_modify_ack(struct osmocom_ms *ms,
struct gsm48_chan_desc *cd, uint8_t mode)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_chan_mode_modify *cm;
LOGP(DRR, LOGL_INFO, "CHAN.MODE.MOD ACKNOWLEDGE\n");
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
cm = (struct gsm48_chan_mode_modify *) msgb_put(nmsg, sizeof(*cm));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_CHAN_MODE_MODIF_ACK;
/* CD */
memcpy(&cm->chan_desc, cd, sizeof(struct gsm48_chan_desc));
/* mode */
cm->mode = mode;
return gsm48_send_rsl(ms, RSL_MT_DATA_REQ, nmsg, 0);
}
/* 9.1.5 CHANNEL MODE MODIFY is received */
static int gsm48_rr_rx_chan_modify(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_chan_mode_modify *cm =
(struct gsm48_chan_mode_modify *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*cm);
struct gsm48_rr_cd *cd = &rr->cd_now;
uint8_t ch_type, ch_subch, ch_ts;
uint8_t cause;
LOGP(DRR, LOGL_INFO, "CHANNEL MODE MODIFY\n");
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of CHANNEL MODE MODIFY "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* decode channel description */
cd->chan_nr = cm->chan_desc.chan_nr;
rsl_dec_chan_nr(cd->chan_nr, &ch_type, &ch_subch, &ch_ts);
if (cm->chan_desc.h0.h) {
cd->h = 1;
gsm48_decode_chan_h1(&cm->chan_desc, &cd->tsc, &cd->maio,
&cd->hsn);
LOGP(DRR, LOGL_INFO, " (chan_nr 0x%02x MAIO %u HSN %u TS %u "
"SS %u TSC %u mode %u)\n", cm->chan_desc.chan_nr,
cd->maio, cd->hsn, ch_ts, ch_subch, cd->tsc, cm->mode);
} else {
cd->h = 0;
gsm48_decode_chan_h0(&cm->chan_desc, &cd->tsc, &cd->arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cd->arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " (chan_nr 0x%02x ARFCN %s TS %u SS %u "
"TSC %u mode %u)\n", cm->chan_desc.chan_nr,
gsm_print_arfcn(cd->arfcn), ch_ts, ch_subch, cd->tsc,
cm->mode);
}
/* mode */
cause = gsm48_rr_check_mode(ms, cd->chan_nr, cm->mode);
if (cause)
return gsm48_rr_tx_rr_status(ms, cause);
cd->mode = cm->mode;
gsm48_rr_set_mode(ms, cd->chan_nr, cd->mode);
return gsm48_rr_tx_chan_modify_ack(ms, &cm->chan_desc, cm->mode);
}
/* 9.1.3 sending ASSIGNMENT COMPLETE */
static int gsm48_rr_tx_ass_cpl(struct osmocom_ms *ms, uint8_t cause)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_ass_cpl *ac;
LOGP(DRR, LOGL_INFO, "ASSIGNMENT COMPLETE (cause #%d)\n", cause);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
ac = (struct gsm48_ass_cpl *) msgb_put(nmsg, sizeof(*ac));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_ASS_COMPL;
/* RR_CAUSE */
ac->rr_cause = cause;
/* set T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec = 0;
return gsm48_send_rsl(ms, RSL_MT_RES_REQ, nmsg, 0);
}
/* 9.1.4 sending ASSIGNMENT FAILURE */
static int gsm48_rr_tx_ass_fail(struct osmocom_ms *ms, uint8_t cause,
uint8_t rsl_prim)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_ass_fail *af;
LOGP(DRR, LOGL_INFO, "ASSIGNMENT FAILURE (cause #%d)\n", cause);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
af = (struct gsm48_ass_fail *) msgb_put(nmsg, sizeof(*af));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_ASS_COMPL;
/* RR_CAUSE */
af->rr_cause = cause;
return gsm48_send_rsl(ms, rsl_prim, nmsg, 0);
}
/* 9.1.2 ASSIGNMENT COMMAND is received */
static int gsm48_rr_rx_ass_cmd(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_ass_cmd *ac = (struct gsm48_ass_cmd *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*ac);
struct tlv_parsed tp;
struct gsm48_rr_cd *cda = &rr->cd_after;
struct gsm48_rr_cd *cdb = &rr->cd_before;
uint8_t ch_type, ch_subch, ch_ts;
uint8_t before_time = 0;
uint16_t ma[64];
uint8_t ma_len;
uint32_t start_mili = 0;
uint8_t cause;
struct msgb *nmsg;
LOGP(DRR, LOGL_INFO, "ASSIGNMENT COMMAND\n");
memset(cda, 0, sizeof(*cda));
cda->ind_tx_power = rr->cd_now.ind_tx_power;
memset(cdb, 0, sizeof(*cdb));
cdb->ind_tx_power = rr->cd_now.ind_tx_power;
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of ASSIGNMENT COMMAND "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
tlv_parse(&tp, &gsm48_rr_att_tlvdef, ac->data, payload_len, 0, 0);
/* decode channel description (before time) */
if (TLVP_PRESENT(&tp, GSM48_IE_CH_DESC_1_BEFORE)) {
struct gsm48_chan_desc *ccd = (struct gsm48_chan_desc *)
TLVP_VAL(&tp, GSM48_IE_CH_DESC_1_BEFORE);
cdb->chan_nr = ccd->chan_nr;
rsl_dec_chan_nr(cdb->chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ccd->h0.h) {
cdb->h = 1;
gsm48_decode_chan_h1(ccd, &cdb->tsc, &cdb->maio,
&cdb->hsn);
LOGP(DRR, LOGL_INFO, " before: (chan_nr 0x%02x MAIO %u "
"HSN %u TS %u SS %u TSC %u)\n", ccd->chan_nr,
cdb->maio, cdb->hsn, ch_ts, ch_subch, cdb->tsc);
} else {
cdb->h = 0;
gsm48_decode_chan_h0(ccd, &cdb->tsc, &cdb->arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cdb->arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " before: (chan_nr 0x%02x "
"ARFCN %s TS %u SS %u TSC %u)\n", ccd->chan_nr,
gsm_print_arfcn(cdb->arfcn),
ch_ts, ch_subch, cdb->tsc);
}
before_time = 1;
}
/* decode channel description (after time) */
cda->chan_nr = ac->chan_desc.chan_nr;
rsl_dec_chan_nr(cda->chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ac->chan_desc.h0.h) {
cda->h = 1;
gsm48_decode_chan_h1(&ac->chan_desc, &cda->tsc, &cda->maio,
&cda->hsn);
LOGP(DRR, LOGL_INFO, " after: (chan_nr 0x%02x MAIO %u HSN %u "
"TS %u SS %u TSC %u)\n", ac->chan_desc.chan_nr,
cda->maio, cda->hsn, ch_ts, ch_subch, cda->tsc);
} else {
cda->h = 0;
gsm48_decode_chan_h0(&ac->chan_desc, &cda->tsc, &cda->arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cda->arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " after: (chan_nr 0x%02x ARFCN %s TS %u "
"SS %u TSC %u)\n", ac->chan_desc.chan_nr,
gsm_print_arfcn(cda->arfcn), ch_ts, ch_subch, cda->tsc);
}
/* starting time */
#ifdef TEST_STARTING_TIMER
cda->start = 1;
cda->start_tm.fn = (ms->meas.last_fn + TEST_STARTING_TIMER) % 42432;
LOGP(DRR, LOGL_INFO, " TESTING: starting time ahead\n");
#else
if (TLVP_PRESENT(&tp, GSM48_IE_START_TIME)) {
gsm48_decode_start_time(cda, (struct gsm48_start_time *)
TLVP_VAL(&tp, GSM48_IE_START_TIME));
/* 9.1.2.5 "... before time IE is not present..." */
if (!before_time) {
LOGP(DRR, LOGL_INFO, " -> channel description after "
"time only, but starting time\n");
} else
LOGP(DRR, LOGL_INFO, " -> channel description before "
"and after time\n");
} else {
/* 9.1.2.5 "... IEs unnecessary in this message." */
if (before_time) {
before_time = 0;
LOGP(DRR, LOGL_INFO, " -> channel description before "
"time, but no starting time, ignoring!\n");
}
}
#endif
/* mobile allocation / frequency list after time */
if (cda->h) {
if (TLVP_PRESENT(&tp, GSM48_IE_MA_AFTER)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_MA_AFTER) - 1;
LOGP(DRR, LOGL_INFO, " after: hopping required and "
"mobile allocation available\n");
if (*lv + 1 > sizeof(cda->mob_alloc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cda->mob_alloc_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_FREQ_L_AFTER)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_FREQ_L_AFTER) - 1;
LOGP(DRR, LOGL_INFO, " after: hopping required and "
"frequency list available\n");
if (*lv + 1 > sizeof(cda->freq_list_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cda->freq_list_lv, lv, *lv + 1);
} else {
LOGP(DRR, LOGL_NOTICE, " after: hopping required, but "
"no mobile allocation / frequency list\n");
}
}
/* mobile allocation / frequency list before time */
if (cdb->h) {
if (TLVP_PRESENT(&tp, GSM48_IE_MA_BEFORE)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_MA_BEFORE) - 1;
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"mobile allocation available\n");
if (*lv + 1 > sizeof(cdb->mob_alloc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cdb->mob_alloc_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_FREQ_L_BEFORE)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_FREQ_L_BEFORE) - 1;
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency list available\n");
if (*lv + 1 > sizeof(cdb->freq_list_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cdb->freq_list_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_F_CH_SEQ_BEFORE)) {
const uint8_t *v =
TLVP_VAL(&tp, GSM48_IE_F_CH_SEQ_BEFORE);
uint8_t len = TLVP_LEN(&tp, GSM48_IE_F_CH_SEQ_BEFORE);
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency channel sequence available\n");
if (len + 1 > sizeof(cdb->freq_seq_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
cdb->freq_seq_lv[0] = len;
memcpy(cdb->freq_seq_lv + 1, v, len);
} else
if (cda->mob_alloc_lv[0]) {
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"mobile allocation not available, using "
"mobile allocation after time\n");
memcpy(cdb->mob_alloc_lv, cda->mob_alloc_lv,
sizeof(cdb->mob_alloc_lv));
} else
if (cda->freq_list_lv[0]) {
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency list not available, using "
"frequency list after time\n");
memcpy(cdb->freq_list_lv, cda->freq_list_lv,
sizeof(cdb->freq_list_lv));
} else {
LOGP(DRR, LOGL_NOTICE, " before: hopping required, but "
"no mobile allocation / frequency list\n");
}
}
/* cell channel description */
if (TLVP_PRESENT(&tp, GSM48_IE_CELL_CH_DESC)) {
const uint8_t *v = TLVP_VAL(&tp, GSM48_IE_CELL_CH_DESC);
uint8_t len = TLVP_LEN(&tp, GSM48_IE_CELL_CH_DESC);
LOGP(DRR, LOGL_INFO, " both: using cell channel description "
"in case of mobile allocation\n");
if (len + 1 > sizeof(cdb->cell_desc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
cdb->cell_desc_lv[0] = len;
memcpy(cdb->cell_desc_lv + 1, v, len);
cda->cell_desc_lv[0] = len;
memcpy(cda->cell_desc_lv + 1, v, len);
} else {
/* keep old */
memcpy(cdb->cell_desc_lv, rr->cd_now.cell_desc_lv,
sizeof(cdb->cell_desc_lv));
memcpy(cda->cell_desc_lv, rr->cd_now.cell_desc_lv,
sizeof(cda->cell_desc_lv));
}
/* channel mode */
if (TLVP_PRESENT(&tp, GSM48_IE_CHANMODE_1)) {
cda->mode = cdb->mode = *TLVP_VAL(&tp, GSM48_IE_CHANMODE_1);
LOGP(DRR, LOGL_INFO, " both: changing channel mode 0x%02x\n",
cda->mode);
} else
cda->mode = cdb->mode = rr->cd_now.mode;
/* cipher mode setting */
if (TLVP_PRESENT(&tp, GSM48_IE_CIP_MODE_SET)) {
cda->cipher = cdb->cipher =
*TLVP_VAL(&tp, GSM48_IE_CIP_MODE_SET);
LOGP(DRR, LOGL_INFO, " both: changing cipher mode 0x%02x\n",
cda->cipher);
} else
cda->cipher = cdb->cipher = rr->cd_now.cipher;
/* power command and TA (before and after time) */
gsm48_decode_power_cmd_acc(
(struct gsm48_power_cmd *) &ac->power_command,
&cda->ind_tx_power, NULL);
cdb->ind_tx_power = cda->ind_tx_power;
cda->ind_ta = cdb->ind_ta = rr->cd_now.ind_ta; /* same cell */
LOGP(DRR, LOGL_INFO, " both: (tx_power %d TA %d)\n", cda->ind_tx_power,
cda->ind_ta);
/* check if we have to change channel at starting time */
if (cda->start) {
int32_t now, start, diff;
/* how much time do we have left? */
now = ms->meas.last_fn % 42432;
start = cda->start_tm.fn % 42432;
diff = start - now;
if (diff < 0)
diff += 42432;
LOGP(DRR, LOGL_INFO, " after: (Tnow %d Tstart %d diff %d)\n",
now, start, diff);
start_mili = (uint32_t)diff * 19580 / 42432 * 10;
if (diff >= 32024 || !start_mili) {
LOGP(DRR, LOGL_INFO, " -> Start time already "
"elapsed\n");
before_time = 0;
cda->start = 0;
} else {
LOGP(DRR, LOGL_INFO, " -> Start time is %d ms in the "
"future\n", start_mili);
}
}
/* check if channels are valid */
cause = gsm48_rr_check_mode(ms, cda->chan_nr, cda->mode);
if (cause)
return gsm48_rr_tx_ass_fail(ms, cause, RSL_MT_DATA_REQ);
if (before_time) {
cause = gsm48_rr_render_ma(ms, cdb, ma, &ma_len);
if (cause)
return gsm48_rr_tx_ass_fail(ms, cause, RSL_MT_DATA_REQ);
}
cause = gsm48_rr_render_ma(ms, cda, ma, &ma_len);
if (cause)
return gsm48_rr_tx_ass_fail(ms, cause, RSL_MT_DATA_REQ);
#ifdef TEST_FREQUENCY_MOD
LOGP(DRR, LOGL_INFO, " TESTING: frequency modify ASS.CMD\n");
before_time = 1;
memcpy(cdb, cda, sizeof(*cdb));
cdb->h = 0;
cdb->arfcn = 0;
#endif
/* schedule start of assignment */
rr->modify_state = GSM48_RR_MOD_ASSIGN;
if (!before_time && cda->start) {
start_rr_t_starting(rr, start_mili / 1000, start_mili % 1000);
/* when timer fires, start time is already elapsed */
cda->start = 0;
return 0;
}
/* if no starting time, start suspension of current link directly */
LOGP(DRR, LOGL_INFO, "request suspension of data link\n");
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gsm48_send_rsl(ms, RSL_MT_SUSP_REQ, nmsg, 0);
/* release SAPI 3 link, if exits
* FIXME: suspend and resume afterward */
gsm48_release_sapi3_link(ms);
return 0;
}
/* 9.1.16 sending HANDOVER COMPLETE */
static int gsm48_rr_tx_hando_cpl(struct osmocom_ms *ms, uint8_t cause)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_ho_cpl *hc;
LOGP(DRR, LOGL_INFO, "HANDOVER COMPLETE (cause #%d)\n", cause);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
hc = (struct gsm48_ho_cpl *) msgb_put(nmsg, sizeof(*hc));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_HANDO_COMPL;
/* RR_CAUSE */
hc->rr_cause = cause;
// FIXME: mobile observed time
/* set T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec = 0;
return gsm48_send_rsl(ms, RSL_MT_RES_REQ, nmsg, 0);
}
/* 9.1.4 sending HANDOVER FAILURE */
static int gsm48_rr_tx_hando_fail(struct osmocom_ms *ms, uint8_t cause,
uint8_t rsl_prim)
{
struct msgb *nmsg;
struct gsm48_hdr *gh;
struct gsm48_ho_fail *hf;
LOGP(DRR, LOGL_INFO, "HANDOVER FAILURE (cause #%d)\n", cause);
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gh = (struct gsm48_hdr *) msgb_put(nmsg, sizeof(*gh));
hf = (struct gsm48_ho_fail *) msgb_put(nmsg, sizeof(*hf));
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_ASS_COMPL;
/* RR_CAUSE */
hf->rr_cause = cause;
return gsm48_send_rsl(ms, rsl_prim, nmsg, 0);
}
/* receiving HANDOVER COMMAND message (9.1.15) */
static int gsm48_rr_rx_hando_cmd(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = cs->si;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_ho_cmd *ho = (struct gsm48_ho_cmd *)gh->data;
int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*ho);
struct tlv_parsed tp;
struct gsm48_rr_cd *cda = &rr->cd_after;
struct gsm48_rr_cd *cdb = &rr->cd_before;
uint16_t arfcn;
uint8_t bcc, ncc;
uint8_t ch_type, ch_subch, ch_ts;
uint8_t before_time = 0;
uint16_t ma[64];
uint8_t ma_len;
uint32_t start_mili = 0;
uint8_t cause;
struct msgb *nmsg;
LOGP(DRR, LOGL_INFO, "HANDOVER COMMAND\n");
memset(cda, 0, sizeof(*cda));
cda->ind_tx_power = rr->cd_now.ind_tx_power;
memset(cdb, 0, sizeof(*cdb));
cdb->ind_tx_power = rr->cd_now.ind_tx_power;
if (payload_len < 0) {
LOGP(DRR, LOGL_NOTICE, "Short read of HANDOVER COMMAND "
"message.\n");
return gsm48_rr_tx_rr_status(ms,
GSM48_RR_CAUSE_PROT_ERROR_UNSPC);
}
/* cell description */
gsm48_decode_cell_desc(&ho->cell_desc, &arfcn, &ncc, &bcc);
/* handover reference */
rr->chan_req_val = ho->ho_ref;
rr->chan_req_mask = 0x00;
tlv_parse(&tp, &gsm48_rr_att_tlvdef, ho->data, payload_len, 0, 0);
/* sync ind */
if (TLVP_PRESENT(&tp, GSM48_IE_SYNC_IND)) {
gsm48_decode_sync_ind(rr, (struct gsm48_sync_ind *)
TLVP_VAL(&tp, GSM48_IE_SYNC_IND));
LOGP(DRR, LOGL_INFO, " (sync_ind=%d rot=%d nci=%d)\n",
rr->hando_sync_ind, rr->hando_rot, rr->hando_nci);
}
/* decode channel description (before time) */
if (TLVP_PRESENT(&tp, GSM48_IE_CH_DESC_1_BEFORE)) {
struct gsm48_chan_desc *ccd = (struct gsm48_chan_desc *)
TLVP_VAL(&tp, GSM48_IE_CH_DESC_1_BEFORE);
cdb->chan_nr = ccd->chan_nr;
rsl_dec_chan_nr(cdb->chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ccd->h0.h) {
cdb->h = 1;
gsm48_decode_chan_h1(ccd, &cdb->tsc, &cdb->maio,
&cdb->hsn);
LOGP(DRR, LOGL_INFO, " before: (chan_nr 0x%02x MAIO %u "
"HSN %u TS %u SS %u TSC %u)\n", ccd->chan_nr,
cdb->maio, cdb->hsn, ch_ts, ch_subch, cdb->tsc);
} else {
cdb->h = 0;
gsm48_decode_chan_h0(ccd, &cdb->tsc, &cdb->arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cdb->arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " before: (chan_nr 0x%02x "
"ARFCN %s TS %u SS %u TSC %u)\n", ccd->chan_nr,
gsm_print_arfcn(cdb->arfcn),
ch_ts, ch_subch, cdb->tsc);
}
before_time = 1;
}
/* decode channel description (after time) */
cda->chan_nr = ho->chan_desc.chan_nr;
rsl_dec_chan_nr(cda->chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ho->chan_desc.h0.h) {
cda->h = 1;
gsm48_decode_chan_h1(&ho->chan_desc, &cda->tsc, &cda->maio,
&cda->hsn);
LOGP(DRR, LOGL_INFO, " after: (chan_nr 0x%02x MAIO %u HSN %u "
"TS %u SS %u TSC %u)\n", ho->chan_desc.chan_nr,
cda->maio, cda->hsn, ch_ts, ch_subch, cda->tsc);
} else {
cda->h = 0;
gsm48_decode_chan_h0(&ho->chan_desc, &cda->tsc, &cda->arfcn);
if (gsm_refer_pcs(cs->arfcn, s))
cda->arfcn |= ARFCN_PCS;
LOGP(DRR, LOGL_INFO, " after: (chan_nr 0x%02x ARFCN %s TS %u "
"SS %u TSC %u)\n", ho->chan_desc.chan_nr,
gsm_print_arfcn(cda->arfcn), ch_ts, ch_subch, cda->tsc);
}
/* starting time */
#ifdef TEST_STARTING_TIMER
cda->start = 1;
cda->start_tm.fn = (ms->meas.last_fn + TEST_STARTING_TIMER) % 42432;
LOGP(DRR, LOGL_INFO, " TESTING: starting time ahead\n");
#else
if (TLVP_PRESENT(&tp, GSM48_IE_START_TIME)) {
gsm48_decode_start_time(cda, (struct gsm48_start_time *)
TLVP_VAL(&tp, GSM48_IE_START_TIME));
/* 9.1.2.5 "... before time IE is not present..." */
if (!before_time) {
LOGP(DRR, LOGL_INFO, " -> channel description after "
"time only, but starting time\n");
} else
LOGP(DRR, LOGL_INFO, " -> channel description before "
"and after time\n");
} else {
/* 9.1.2.5 "... IEs unnecessary in this message." */
if (before_time) {
before_time = 0;
LOGP(DRR, LOGL_INFO, " -> channel description before "
"time, but no starting time, ignoring!\n");
}
}
#endif
/* mobile allocation / frequency list after time */
if (cda->h) {
if (TLVP_PRESENT(&tp, GSM48_IE_MA_AFTER)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_MA_AFTER) - 1;
LOGP(DRR, LOGL_INFO, " after: hopping required and "
"mobile allocation available\n");
if (*lv + 1 > sizeof(cda->mob_alloc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cda->mob_alloc_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_FREQ_L_AFTER)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_FREQ_L_AFTER) - 1;
LOGP(DRR, LOGL_INFO, " after: hopping required and "
"frequency list available\n");
if (*lv + 1 > sizeof(cda->freq_list_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cda->freq_list_lv, lv, *lv + 1);
} else {
LOGP(DRR, LOGL_NOTICE, " after: hopping required, but "
"no mobile allocation / frequency list\n");
}
}
/* mobile allocation / frequency list before time */
if (cdb->h) {
if (TLVP_PRESENT(&tp, GSM48_IE_MA_BEFORE)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_MA_BEFORE) - 1;
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"mobile allocation available\n");
if (*lv + 1 > sizeof(cdb->mob_alloc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cdb->mob_alloc_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_FREQ_L_BEFORE)) {
const uint8_t *lv =
TLVP_VAL(&tp, GSM48_IE_FREQ_L_BEFORE) - 1;
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency list available\n");
if (*lv + 1 > sizeof(cdb->freq_list_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
memcpy(cdb->freq_list_lv, lv, *lv + 1);
} else
if (TLVP_PRESENT(&tp, GSM48_IE_F_CH_SEQ_BEFORE)) {
const uint8_t *v =
TLVP_VAL(&tp, GSM48_IE_F_CH_SEQ_BEFORE);
uint8_t len = TLVP_LEN(&tp, GSM48_IE_F_CH_SEQ_BEFORE);
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency channel sequence available\n");
if (len + 1 > sizeof(cdb->freq_seq_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
cdb->freq_seq_lv[0] = len;
memcpy(cdb->freq_seq_lv, v + 1, *v);
} else
if (cda->mob_alloc_lv[0]) {
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"mobile allocation not available, using "
"mobile allocation after time\n");
memcpy(cdb->mob_alloc_lv, cda->mob_alloc_lv,
sizeof(cdb->mob_alloc_lv));
} else
if (cda->freq_list_lv[0]) {
LOGP(DRR, LOGL_INFO, " before: hopping required and "
"frequency list not available, using "
"frequency list after time\n");
memcpy(cdb->freq_list_lv, cda->freq_list_lv,
sizeof(cdb->freq_list_lv));
} else {
LOGP(DRR, LOGL_NOTICE, " before: hopping required, but "
"no mobile allocation / frequency list\n");
}
}
/* cell channel description */
if (TLVP_PRESENT(&tp, GSM48_IE_CELL_CH_DESC)) {
const uint8_t *v = TLVP_VAL(&tp, GSM48_IE_CELL_CH_DESC);
uint8_t len = TLVP_LEN(&tp, GSM48_IE_CELL_CH_DESC);
LOGP(DRR, LOGL_INFO, " both: using cell channel description "
"in case of mobile allocation\n");
if (len + 1 > sizeof(cdb->cell_desc_lv)) {
LOGP(DRR, LOGL_ERROR, "Error: no LV space!\n");
return -ENOMEM;
}
cdb->cell_desc_lv[0] = len;
memcpy(cdb->cell_desc_lv + 1, v, len);
cda->cell_desc_lv[0] = len;
memcpy(cda->cell_desc_lv + 1, v, len);
} else {
/* keep old */
memcpy(cdb->cell_desc_lv, rr->cd_now.cell_desc_lv,
sizeof(cdb->cell_desc_lv));
memcpy(cda->cell_desc_lv, rr->cd_now.cell_desc_lv,
sizeof(cda->cell_desc_lv));
}
/* channel mode */
if (TLVP_PRESENT(&tp, GSM48_IE_CHANMODE_1)) {
cda->mode = cdb->mode = *TLVP_VAL(&tp, GSM48_IE_CHANMODE_1);
LOGP(DRR, LOGL_INFO, " both: changing channel mode 0x%02x\n",
cda->mode);
} else
cda->mode = cdb->mode = rr->cd_now.mode;
/* cipher mode setting */
if (TLVP_PRESENT(&tp, GSM48_IE_CIP_MODE_SET)) {
cda->cipher = cdb->cipher =
*TLVP_VAL(&tp, GSM48_IE_CIP_MODE_SET);
LOGP(DRR, LOGL_INFO, " both: changing cipher mode 0x%02x\n",
cda->cipher);
} else
cda->cipher = cdb->cipher = rr->cd_now.cipher;
/* power command and TA (before and after time) */
gsm48_decode_power_cmd_acc(
(struct gsm48_power_cmd *) &ho->power_command,
&cda->ind_tx_power, &rr->hando_act);
cdb->ind_tx_power = cda->ind_tx_power;
cda->ind_ta = cdb->ind_ta = rr->cd_now.ind_ta; /* same cell */
LOGP(DRR, LOGL_INFO, " both: (tx_power %d TA %d access=%s)\n",
cda->ind_tx_power, cda->ind_ta,
(rr->hando_act) ? "optional" : "mandatory");
/* check if we have to change channel at starting time */
if (cda->start) {
int32_t now, start, diff;
/* how much time do we have left? */
now = ms->meas.last_fn % 42432;
start = cda->start_tm.fn % 42432;
diff = start - now;
if (diff < 0)
diff += 42432;
LOGP(DRR, LOGL_INFO, " after: (Tnow %d Tstart %d diff %d)\n",
now, start, diff);
start_mili = (uint32_t)diff * 19580 / 42432 * 10;
if (diff >= 32024 || !start_mili) {
LOGP(DRR, LOGL_INFO, " -> Start time already "
"elapsed\n");
before_time = 0;
cda->start = 0;
} else {
LOGP(DRR, LOGL_INFO, " -> Start time is %d ms in the "
"future\n", start_mili);
}
}
/* check if channels are valid */
if (before_time) {
cause = gsm48_rr_render_ma(ms, cdb, ma, &ma_len);
if (cause)
return gsm48_rr_tx_hando_fail(ms, cause, RSL_MT_DATA_REQ);
}
cause = gsm48_rr_render_ma(ms, cda, ma, &ma_len);
if (cause)
return gsm48_rr_tx_hando_fail(ms, cause, RSL_MT_DATA_REQ);
#if 0
if (not supported) {
LOGP(DRR, LOGL_NOTICE, "New channel is not supported.\n");
return GSM48_RR_CAUSE_CHAN_MODE_UNACCEPT;
}
#endif
#ifdef TEST_FREQUENCY_MOD
LOGP(DRR, LOGL_INFO, " TESTING: frequency modify HANDO.CMD\n");
before_time = 1;
memcpy(cdb, cda, sizeof(*cdb));
cdb->h = 0;
cdb->arfcn = 0;
#endif
/* schedule start of handover */
rr->modify_state = GSM48_RR_MOD_HANDO;
if (!before_time && cda->start) {
start_rr_t_starting(rr, start_mili / 1000, start_mili % 1000);
/* when timer fires, start time is already elapsed */
cda->start = 0;
return 0;
}
/* if no starting time, start suspension of current link directly */
LOGP(DRR, LOGL_INFO, "request suspension of data link\n");
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
gsm48_send_rsl(ms, RSL_MT_SUSP_REQ, nmsg, 0);
/* release SAPI 3 link, if exits
* FIXME: suspend and resume afterward */
gsm48_release_sapi3_link(ms);
return 0;
}
/* send all queued messages down to layer 2 */
static int gsm48_rr_dequeue_down(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *msg;
while((msg = msgb_dequeue(&rr->downqueue))) {
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
uint8_t sapi = rrh->sapi;
LOGP(DRR, LOGL_INFO, "Sending queued message.\n");
if (sapi && rr->sapi3_state != GSM48_RR_SAPI3ST_ESTAB) {
LOGP(DRR, LOGL_INFO, "Dropping SAPI 3 msg, no link!\n");
msgb_free(msg);
return 0;
}
gsm48_send_rsl(ms, RSL_MT_DATA_REQ, msg, 0);
}
return 0;
}
/* channel is resumed in dedicated mode */
static int gsm48_rr_estab_cnf_dedicated(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
LOGP(DRR, LOGL_INFO, "data link is resumed\n");
/* transmit queued frames during ho / ass transition */
gsm48_rr_dequeue_down(ms);
rr->modify_state = GSM48_RR_MOD_NONE;
return 0;
}
/* suspend confirm in dedicated mode */
static int gsm48_rr_susp_cnf_dedicated(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
if (rr->modify_state) {
uint16_t ma[64];
uint8_t ma_len;
/* deactivating dedicated mode */
LOGP(DRR, LOGL_INFO, "suspension coplete, leaving dedicated "
"mode\n");
l1ctl_tx_dm_rel_req(ms);
ms->meas.rl_fail = 0;
rr->dm_est = 0;
l1ctl_tx_reset_req(ms, L1CTL_RES_T_SCHED);
/* store current channel descriptions */
memcpy(&rr->cd_last, &rr->cd_now, sizeof(rr->cd_last));
/* copy channel description "after time" */
memcpy(&rr->cd_now, &rr->cd_after, sizeof(rr->cd_now));
if (rr->cd_after.start) {
/* render channel "before time" */
gsm48_rr_render_ma(ms, &rr->cd_before, ma, &ma_len);
/* activate channel */
gsm48_rr_activate_channel(ms, &rr->cd_before, ma,
ma_len);
/* render channel "after time" */
gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len);
/* schedule change of channel */
gsm48_rr_channel_after_time(ms, &rr->cd_now, ma, ma_len,
rr->cd_now.start_tm.fn);
} else {
/* render channel "after time" */
gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len);
/* activate channel */
gsm48_rr_activate_channel(ms, &rr->cd_now, ma, ma_len);
}
/* send DL-RESUME REQUEST */
LOGP(DRR, LOGL_INFO, "request resume of data link\n");
switch (rr->modify_state) {
case GSM48_RR_MOD_ASSIGN:
gsm48_rr_tx_ass_cpl(ms, GSM48_RR_CAUSE_NORMAL);
break;
case GSM48_RR_MOD_HANDO:
gsm48_rr_tx_hando_cpl(ms, GSM48_RR_CAUSE_NORMAL);
break;
}
#ifdef TODO
/* trigger RACH */
if (rr->modify_state == GSM48_RR_MOD_HANDO) {
gsm48_rr_tx_hando_access(ms);
rr->hando_acc_left = 3;
}
#endif
}
return 0;
}
/*
* radio ressource requests
*/
/* establish request for dedicated mode */
static int gsm48_rr_est_req(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm322_cellsel *cs = &ms->cellsel;
struct gsm48_sysinfo *s = &cs->sel_si;
struct gsm_subscriber *subscr = &ms->subscr;
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
struct gsm48_hdr *gh = msgb_l3(msg);
uint8_t cause;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
uint16_t acc_class;
/* 3.3.1.1.3.2 */
if (osmo_timer_pending(&rr->t3122)) {
if (rrh->cause != RR_EST_CAUSE_EMERGENCY) {
LOGP(DRR, LOGL_INFO, "T3122 running, rejecting!\n");
cause = RR_REL_CAUSE_T3122;
reject:
LOGP(DSUM, LOGL_INFO, "Establishing radio link not "
"possible\n");
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = cause;
return gsm48_rr_upmsg(ms, nmsg);
}
LOGP(DRR, LOGL_INFO, "T3122 running, but emergency call\n");
stop_rr_t3122(rr);
}
/* if state is not idle */
if (rr->state != GSM48_RR_ST_IDLE) {
LOGP(DRR, LOGL_INFO, "We are not IDLE yet, rejecting!\n");
cause = RR_REL_CAUSE_TRY_LATER;
goto reject;
}
/* cell selected */
if (!cs->selected) {
LOGP(DRR, LOGL_INFO, "No cell selected, rejecting!\n");
cause = RR_REL_CAUSE_TRY_LATER;
goto reject;
}
/* check if camping */
if (cs->state != GSM322_C3_CAMPED_NORMALLY
&& rrh->cause != RR_EST_CAUSE_EMERGENCY) {
LOGP(DRR, LOGL_INFO, "Not camping normally, rejecting! "
"(cs->state = %d)\n", cs->state);
cause = RR_REL_CAUSE_EMERGENCY_ONLY;
goto reject;
}
if (cs->state != GSM322_C3_CAMPED_NORMALLY
&& cs->state != GSM322_C7_CAMPED_ANY_CELL) {
LOGP(DRR, LOGL_INFO, "Not camping, rejecting! "
"(cs->state = %d)\n", cs->state);
cause = RR_REL_CAUSE_TRY_LATER;
goto reject;
}
/* check for relevant information */
if (!s->si3) {
LOGP(DRR, LOGL_INFO, "Not enough SI, rejecting!\n");
cause = RR_REL_CAUSE_TRY_LATER;
goto reject;
}
/* 3.3.1.1.1 */
if (!subscr->acc_barr && s->cell_barr) {
LOGP(DRR, LOGL_INFO, "Cell barred, rejecting!\n");
cause = RR_REL_CAUSE_NOT_AUTHORIZED;
goto reject;
}
if (rrh->cause == RR_EST_CAUSE_EMERGENCY)
acc_class = subscr->acc_class | 0x0400;
else
acc_class = subscr->acc_class & 0xfbff;
if (!subscr->acc_barr && !(acc_class & (s->class_barr ^ 0xffff))) {
LOGP(DRR, LOGL_INFO, "Cell barred for our access class (access "
"%04x barred %04x)!\n", acc_class, s->class_barr);
cause = RR_REL_CAUSE_NOT_AUTHORIZED;
goto reject;
}
/* requested by RR */
rr->rr_est_req = 1;
/* clone and store REQUEST message */
if (!gh) {
LOGP(DRR, LOGL_ERROR, "Error, missing l3 message\n");
return -EINVAL;
}
rr->rr_est_msg = gsm48_l3_msgb_alloc();
if (!rr->rr_est_msg)
return -ENOMEM;
memcpy(msgb_put(rr->rr_est_msg, msgb_l3len(msg)),
msgb_l3(msg), msgb_l3len(msg));
/* request channel */
return gsm48_rr_chan_req(ms, rrh->cause, 0, 0);
}
/* 3.4.2 transfer data in dedicated mode */
static int gsm48_rr_data_req(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
uint8_t sapi = rrh->sapi;
if (rr->state != GSM48_RR_ST_DEDICATED) {
msgb_free(msg);
return -EINVAL;
}
/* pull RR header */
msgb_pull(msg, sizeof(struct gsm48_rr_hdr));
/* set sequence number and increment */
gsm48_apply_v_sd(rr, msg);
/* queue message, during handover or assignment procedure */
if (rr->modify_state == GSM48_RR_MOD_ASSIGN
|| rr->modify_state == GSM48_RR_MOD_HANDO) {
LOGP(DRR, LOGL_INFO, "Queueing message during suspend.\n");
msgb_enqueue(&rr->downqueue, msg);
return 0;
}
if (sapi && rr->sapi3_state != GSM48_RR_SAPI3ST_ESTAB) {
LOGP(DRR, LOGL_INFO, "Dropping SAPI 3 msg, no link!\n");
msgb_free(msg);
return 0;
}
/* forward message */
return gsm48_send_rsl(ms, RSL_MT_DATA_REQ, msg,
sapi ? rr->sapi3_link_id : 0);
}
/*
* data indications from data link
*/
/* 3.4.2 data from layer 2 to RR and upper layer*/
static int gsm48_rr_data_ind(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_rr_hdr *rrh;
uint8_t pdisc = gh->proto_discr & 0x0f;
int rc = -EINVAL;
if (pdisc == GSM48_PDISC_RR) {
uint8_t skip_ind = (gh->proto_discr & 0xf0) >> 4;
/* ignore if skip indicator is not B'0000' */
if (skip_ind) {
msgb_free(msg);
return 0;
}
switch(gh->msg_type) {
case GSM48_MT_RR_ADD_ASS:
rc = gsm48_rr_rx_add_ass(ms, msg);
break;
case GSM48_MT_RR_ASS_CMD:
rc = gsm48_rr_rx_ass_cmd(ms, msg);
break;
case GSM48_MT_RR_CIPH_M_CMD:
rc = gsm48_rr_rx_cip_mode_cmd(ms, msg);
break;
case GSM48_MT_RR_CLSM_ENQ:
rc = gsm48_rr_rx_cm_enq(ms, msg);
break;
case GSM48_MT_RR_CHAN_MODE_MODIF:
rc = gsm48_rr_rx_chan_modify(ms, msg);
break;
case GSM48_MT_RR_HANDO_CMD:
rc = gsm48_rr_rx_hando_cmd(ms, msg);
break;
case GSM48_MT_RR_FREQ_REDEF:
rc = gsm48_rr_rx_frq_redef(ms, msg);
break;
case GSM48_MT_RR_CHAN_REL:
rc = gsm48_rr_rx_chan_rel(ms, msg);
break;
case GSM48_MT_RR_APP_INFO:
LOGP(DRR, LOGL_NOTICE, "APP INFO not supported!\n");
break;
default:
LOGP(DRR, LOGL_NOTICE, "Message type 0x%02x unknown.\n",
gh->msg_type);
/* status message */
gsm48_rr_tx_rr_status(ms, GSM48_RR_CAUSE_MSG_TYPE_N);
}
msgb_free(msg);
return rc;
} else if (pdisc == GSM48_PDISC_TEST) {
rc = gsm414_rcv_test(ms, msg);
msgb_free(msg);
return rc;
}
/* pull off RSL header up to L3 message */
msgb_pull(msg, (long)msgb_l3(msg) - (long)msg->data);
/* push RR header */
msgb_push(msg, sizeof(struct gsm48_rr_hdr));
rrh = (struct gsm48_rr_hdr *)msg->data;
rrh->msg_type = GSM48_RR_DATA_IND;
return gsm48_rr_upmsg(ms, msg);
}
/* receive BCCH at RR layer */
static int gsm48_rr_rx_bcch(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_header *sih = msgb_l3(msg);
switch (sih->system_information) {
case GSM48_MT_RR_SYSINFO_1:
return gsm48_rr_rx_sysinfo1(ms, msg);
case GSM48_MT_RR_SYSINFO_2:
return gsm48_rr_rx_sysinfo2(ms, msg);
case GSM48_MT_RR_SYSINFO_2bis:
return gsm48_rr_rx_sysinfo2bis(ms, msg);
case GSM48_MT_RR_SYSINFO_2ter:
return gsm48_rr_rx_sysinfo2ter(ms, msg);
case GSM48_MT_RR_SYSINFO_3:
return gsm48_rr_rx_sysinfo3(ms, msg);
case GSM48_MT_RR_SYSINFO_4:
return gsm48_rr_rx_sysinfo4(ms, msg);
default:
#if 0
LOGP(DRR, LOGL_NOTICE, "BCCH message type 0x%02x not sup.\n",
sih->system_information);
#endif
return -EINVAL;
}
}
/* receive CCCH at RR layer */
static int gsm48_rr_rx_pch_agch(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_system_information_type_header *sih = msgb_l3(msg);
switch (sih->system_information) {
case GSM48_MT_RR_PAG_REQ_1:
return gsm48_rr_rx_pag_req_1(ms, msg);
case GSM48_MT_RR_PAG_REQ_2:
return gsm48_rr_rx_pag_req_2(ms, msg);
case GSM48_MT_RR_PAG_REQ_3:
return gsm48_rr_rx_pag_req_3(ms, msg);
case GSM48_MT_RR_IMM_ASS:
return gsm48_rr_rx_imm_ass(ms, msg);
case GSM48_MT_RR_IMM_ASS_EXT:
return gsm48_rr_rx_imm_ass_ext(ms, msg);
case GSM48_MT_RR_IMM_ASS_REJ:
return gsm48_rr_rx_imm_ass_rej(ms, msg);
default:
#if 0
LOGP(DRR, LOGL_NOTICE, "CCCH message type 0x%02x unknown.\n",
sih->system_information);
#endif
return -EINVAL;
}
}
/* receive ACCH at RR layer */
static int gsm48_rr_rx_acch(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm_settings *set = &ms->settings;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
struct gsm48_hdr *sih = msgb_l3(msg);
uint8_t ind_ta, ind_tx_power;
if (msgb_l2len(msg) < sizeof(*rllh) + 2 + 2) {
LOGP(DRR, LOGL_ERROR, "Missing TA and TX_POWER IEs\n");
return -EINVAL;
}
ind_ta = rllh->data[1];
ind_tx_power = rllh->data[3];
LOGP(DRR, LOGL_INFO, "Indicated ta %d (actual ta %d)\n",
ind_ta, ind_ta - set->alter_delay);
LOGP(DRR, LOGL_INFO, "Indicated tx_power %d\n",
ind_tx_power);
if (ind_ta != rr->cd_now.ind_ta
|| ind_tx_power != rr->cd_now.ind_tx_power) {
LOGP(DRR, LOGL_INFO, "setting new ta and tx_power\n");
l1ctl_tx_param_req(ms, ind_ta - set->alter_delay,
(set->alter_tx_power) ? set->alter_tx_power_value
: ind_tx_power);
rr->cd_now.ind_ta = ind_ta;
rr->cd_now.ind_tx_power = ind_tx_power;
}
switch (sih->msg_type) {
case GSM48_MT_RR_SYSINFO_5:
return gsm48_rr_rx_sysinfo5(ms, msg);
case GSM48_MT_RR_SYSINFO_5bis:
return gsm48_rr_rx_sysinfo5bis(ms, msg);
case GSM48_MT_RR_SYSINFO_5ter:
return gsm48_rr_rx_sysinfo5ter(ms, msg);
case GSM48_MT_RR_SYSINFO_6:
return gsm48_rr_rx_sysinfo6(ms, msg);
default:
LOGP(DRR, LOGL_NOTICE, "ACCH message type 0x%02x unknown.\n",
sih->msg_type);
return -EINVAL;
}
}
/* unit data from layer 2 to RR layer */
static int gsm48_rr_unit_data_ind(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm322_cellsel *cs = &ms->cellsel;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
struct tlv_parsed tv;
uint8_t ch_type, ch_subch, ch_ts;
DEBUGP(DRSL, "RSLms UNIT DATA IND chan_nr=0x%02x link_id=0x%02x\n",
rllh->chan_nr, rllh->link_id);
rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh));
if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) {
DEBUGP(DRSL, "UNIT_DATA_IND without L3 INFO ?!?\n");
return -EIO;
}
msg->l3h = (uint8_t *) TLVP_VAL(&tv, RSL_IE_L3_INFO);
if (cs->ccch_state != GSM322_CCCH_ST_SYNC
&& cs->ccch_state != GSM322_CCCH_ST_DATA)
return -EINVAL;
/* temporary moved here until confirm is fixed */
if (cs->ccch_state != GSM322_CCCH_ST_DATA) {
LOGP(DCS, LOGL_INFO, "Channel provides data.\n");
cs->ccch_state = GSM322_CCCH_ST_DATA;
/* in dedicated mode */
if (ms->rrlayer.state == GSM48_RR_ST_CONN_PEND)
return gsm48_rr_tx_rand_acc(ms, NULL);
/* set timer for reading BCCH */
if (cs->state == GSM322_C2_STORED_CELL_SEL
|| cs->state == GSM322_C1_NORMAL_CELL_SEL
|| cs->state == GSM322_C6_ANY_CELL_SEL
|| cs->state == GSM322_C4_NORMAL_CELL_RESEL
|| cs->state == GSM322_C8_ANY_CELL_RESEL
|| cs->state == GSM322_C5_CHOOSE_CELL
|| cs->state == GSM322_C9_CHOOSE_ANY_CELL
|| cs->state == GSM322_PLMN_SEARCH
|| cs->state == GSM322_HPLMN_SEARCH)
start_cs_timer(cs, ms->support.scan_to, 0);
// TODO: timer depends on BCCH config
}
rsl_dec_chan_nr(rllh->chan_nr, &ch_type, &ch_subch, &ch_ts);
switch (ch_type) {
case RSL_CHAN_PCH_AGCH:
return gsm48_rr_rx_pch_agch(ms, msg);
case RSL_CHAN_BCCH:
return gsm48_rr_rx_bcch(ms, msg);
case RSL_CHAN_Bm_ACCHs:
case RSL_CHAN_Lm_ACCHs:
case RSL_CHAN_SDCCH4_ACCH:
case RSL_CHAN_SDCCH8_ACCH:
return gsm48_rr_rx_acch(ms, msg);
default:
LOGP(DRSL, LOGL_NOTICE, "RSL with chan_nr 0x%02x unknown.\n",
rllh->chan_nr);
return -EINVAL;
}
}
/* 3.4.13.3 RR abort in dedicated mode (also in conn. pending mode) */
static int gsm48_rr_abort_req(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t *mode;
/* stop pending RACH timer */
stop_rr_t3126(rr);
/* release "normally" if we are in dedicated mode */
if (rr->state == GSM48_RR_ST_DEDICATED) {
struct msgb *nmsg;
LOGP(DRR, LOGL_INFO, "Abort in dedicated state, send release "
"to layer 2.\n");
new_rr_state(rr, GSM48_RR_ST_REL_PEND);
/* release message */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 0; /* normal release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, 0);
/* release SAPI 3 link, if exits */
gsm48_release_sapi3_link(ms);
return 0;
}
LOGP(DRR, LOGL_INFO, "Abort in connection pending state, return to "
"idle state.\n");
/* return idle */
new_rr_state(rr, GSM48_RR_ST_IDLE);
return 0;
}
/* release confirm */
static int gsm48_rr_rel_cnf(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
uint8_t cause = RR_REL_CAUSE_NORMAL;
uint16_t ma[64];
uint8_t ma_len;
/* switch back to old channel, if modify/ho failed */
switch (rr->modify_state) {
case GSM48_RR_MOD_ASSIGN:
case GSM48_RR_MOD_HANDO:
/* deactivate channel */
l1ctl_tx_dm_rel_req(ms);
ms->meas.rl_fail = 0;
rr->dm_est = 0;
l1ctl_tx_reset_req(ms, L1CTL_RES_T_SCHED);
/* get old channel description */
memcpy(&rr->cd_now, &rr->cd_last, sizeof(rr->cd_now));
/* render and change radio to old channel */
gsm48_rr_render_ma(ms, &rr->cd_now, ma, &ma_len);
gsm48_rr_activate_channel(ms, &rr->cd_now, ma, ma_len);
/* re-establish old link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
if (rr->modify_state == GSM48_RR_MOD_ASSIGN) {
rr->modify_state = GSM48_RR_MOD_ASSIGN_RESUME;
return gsm48_rr_tx_ass_fail(ms,
GSM48_RR_CAUSE_ABNORMAL_UNSPEC,
RSL_MT_RECON_REQ);
} else {
rr->modify_state = GSM48_RR_MOD_HANDO_RESUME;
return gsm48_rr_tx_hando_fail(ms,
GSM48_RR_CAUSE_ABNORMAL_UNSPEC,
RSL_MT_RECON_REQ);
}
/* returns above */
case GSM48_RR_MOD_ASSIGN_RESUME:
case GSM48_RR_MOD_HANDO_RESUME:
rr->modify_state = GSM48_RR_MOD_NONE;
cause = RR_REL_CAUSE_LINK_FAILURE;
break;
}
LOGP(DSUM, LOGL_INFO, "Requested channel aborted\n");
/* stop T3211 if running */
stop_rr_t3110(rr);
/* send release indication */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = cause;
gsm48_rr_upmsg(ms, nmsg);
/* return idle */
new_rr_state(rr, GSM48_RR_ST_IDLE);
return 0;
}
/* MDL-ERROR */
static int gsm48_rr_mdl_error_ind(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
uint8_t *mode;
uint8_t cause = rllh->data[2];
uint8_t link_id = rllh->link_id;
switch (cause) {
case RLL_CAUSE_SEQ_ERR:
case RLL_CAUSE_UNSOL_DM_RESP_MF:
break;
default:
LOGP(DRR, LOGL_NOTICE, "MDL-Error (cause %d) ignoring\n",
cause);
return 0;
}
LOGP(DRR, LOGL_NOTICE, "MDL-Error (cause %d) aborting\n", cause);
/* disconnect the (main) signalling link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
mode = msgb_put(nmsg, 2);
mode[0] = RSL_IE_RELEASE_MODE;
mode[1] = 1; /* local release */
gsm48_send_rsl_nol3(ms, RSL_MT_REL_REQ, nmsg, link_id);
/* in case of modify/hando: wait for confirm */
if (rr->modify_state)
return 0;
/* send abort ind to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_ABORT_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_LINK_FAILURE;
nrrh->sapi = link_id & 7;
gsm48_rr_upmsg(ms, nmsg);
/* only for main signalling link */
if ((link_id & 7) == 0) {
/* return idle */
new_rr_state(rr, GSM48_RR_ST_IDLE);
/* release SAPI 3 link, if exits */
gsm48_release_sapi3_link(ms);
} else {
new_sapi3_state(rr, GSM48_RR_SAPI3ST_IDLE);
LOGP(DSUM, LOGL_INFO, "Radio link SAPI3 failed\n");
}
return 0;
}
static int gsm48_rr_estab_ind_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
uint8_t link_id = rllh->link_id;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
if (rr->state != GSM48_RR_ST_DEDICATED) {
/* disconnect sapi 3 link */
gsm48_release_sapi3_link(ms);
return -EINVAL;
}
new_sapi3_state(rr, GSM48_RR_SAPI3ST_ESTAB);
rr->sapi3_link_id = link_id; /* set link ID */
LOGP(DSUM, LOGL_INFO, "Radio link SAPI3 is established\n");
if ((link_id & 0xf8) == 0x00) {
/* raise T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH_SHARED;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec= 0;
}
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_EST_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->sapi = link_id & 7;
return gsm48_rr_upmsg(ms, nmsg);
}
static int gsm48_rr_estab_cnf_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
uint8_t link_id = rllh->link_id;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
if (rr->state != GSM48_RR_ST_DEDICATED) {
gsm48_release_sapi3_link(ms);
return -EINVAL;
}
new_sapi3_state(rr, GSM48_RR_SAPI3ST_ESTAB);
rr->sapi3_link_id = link_id; /* set link ID, just to be sure */
LOGP(DSUM, LOGL_INFO, "Radio link SAPI3 is established\n");
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_EST_CNF);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->sapi = link_id & 7;
return gsm48_rr_upmsg(ms, nmsg);
}
/* 3.4.2 data from layer 2 to RR and upper layer (sapi 3)*/
static int gsm48_rr_data_ind_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
uint8_t sapi = rllh->link_id & 7;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_rr_hdr *rrh;
uint8_t pdisc = gh->proto_discr & 0x0f;
if (pdisc == GSM48_PDISC_RR) {
msgb_free(msg);
return -EINVAL;
}
/* pull off RSL header up to L3 message */
msgb_pull(msg, (long)msgb_l3(msg) - (long)msg->data);
/* push RR header */
msgb_push(msg, sizeof(struct gsm48_rr_hdr));
rrh = (struct gsm48_rr_hdr *)msg->data;
rrh->msg_type = GSM48_RR_DATA_IND;
rrh->sapi = sapi;
return gsm48_rr_upmsg(ms, msg);
}
static int gsm48_rr_rel_ind_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
uint8_t link_id = rllh->link_id;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
new_sapi3_state(rr, GSM48_RR_SAPI3ST_IDLE);
LOGP(DSUM, LOGL_INFO, "Radio link SAPI3 is released\n");
/* lower T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec = 0;
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_NORMAL;
nrrh->sapi = link_id & 7;
return gsm48_rr_upmsg(ms, nmsg);
}
/* request SAPI 3 establishment */
static int gsm48_rr_est_req_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t ch_type, ch_subch, ch_ts;
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
uint8_t sapi = rrh->sapi;
struct msgb *nmsg;
if (rr->state != GSM48_RR_ST_DEDICATED) {
struct gsm48_rr_hdr *nrrh;
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_REL_IND);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->cause = RR_REL_CAUSE_NORMAL;
nrrh->sapi = sapi;
return gsm48_rr_upmsg(ms, nmsg);
}
rsl_dec_chan_nr(rr->cd_now.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ch_type != RSL_CHAN_Bm_ACCHs
&& ch_type != RSL_CHAN_Lm_ACCHs) {
LOGP(DRR, LOGL_INFO, "Requesting DCCH link, because no TCH "
"(sapi %d)\n", sapi);
rr->sapi3_link_id = 0x00 | sapi; /* SAPI 3, DCCH */
/* raise T200 of SAPI 0 */
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_sec =
T200_DCCH_SHARED;
ms->lapdm_channel.lapdm_dcch.datalink[DL_SAPI0].dl.t200_usec= 0;
} else {
LOGP(DRR, LOGL_INFO, "Requesting ACCH link, because TCH "
"(sapi %d)\n", sapi);
rr->sapi3_link_id = 0x40 | sapi; /* SAPI 3, ACCH */
}
/* already established */
new_sapi3_state(rr, GSM48_RR_SAPI3ST_WAIT_EST);
/* send message */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
return gsm48_send_rsl_nol3(ms, RSL_MT_EST_REQ, nmsg, rr->sapi3_link_id);
}
static int gsm48_rr_est_req_estab_sapi3(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
uint8_t sapi = rrh->sapi;
struct msgb *nmsg;
struct gsm48_rr_hdr *nrrh;
LOGP(DRR, LOGL_INFO, "Radio link SAPI3 already established\n");
/* send inication to upper layer */
nmsg = gsm48_rr_msgb_alloc(GSM48_RR_EST_CNF);
if (!nmsg)
return -ENOMEM;
nrrh = (struct gsm48_rr_hdr *)nmsg->data;
nrrh->sapi = sapi;
return gsm48_rr_upmsg(ms, nmsg);
}
/*
* state machines
*/
/* state trasitions for link layer messages (lower layer) */
static struct dldatastate {
uint32_t states;
int type;
int (*rout) (struct osmocom_ms *ms, struct msgb *msg);
} dldatastatelist[] = {
/* SAPI 0 on DCCH */
/* data transfer */
{SBIT(GSM48_RR_ST_IDLE) |
SBIT(GSM48_RR_ST_CONN_PEND) |
SBIT(GSM48_RR_ST_DEDICATED) |
SBIT(GSM48_RR_ST_REL_PEND),
RSL_MT_UNIT_DATA_IND, gsm48_rr_unit_data_ind},
{SBIT(GSM48_RR_ST_DEDICATED), /* 3.4.2 */
RSL_MT_DATA_IND, gsm48_rr_data_ind},
/* esablish */
{SBIT(GSM48_RR_ST_IDLE) |
SBIT(GSM48_RR_ST_CONN_PEND) |
SBIT(GSM48_RR_ST_REL_PEND),
RSL_MT_EST_CONF, gsm48_rr_estab_cnf},
/* resume */
{SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_EST_CONF, gsm48_rr_estab_cnf_dedicated},
/* release */
{SBIT(GSM48_RR_ST_CONN_PEND) |
SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_REL_IND, gsm48_rr_rel_ind},
{SBIT(GSM48_RR_ST_REL_PEND),
RSL_MT_REL_CONF, gsm48_rr_rel_cnf},
/* reconnect */
{SBIT(GSM48_RR_ST_CONN_PEND) |
SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_REL_CONF, gsm48_rr_rel_cnf},
/* suspenion */
{SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_SUSP_CONF, gsm48_rr_susp_cnf_dedicated},
#if 0
{SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_CHAN_CNF, gsm48_rr_rand_acc_cnf_dedicated},
#endif
{SBIT(GSM48_RR_ST_DEDICATED),
RSL_MT_ERROR_IND, gsm48_rr_mdl_error_ind},
};
#define DLDATASLLEN \
(sizeof(dldatastatelist) / sizeof(struct dldatastate))
static struct dldatastate dldatastatelists3[] = {
/* SAPI 3 on DCCH */
/* establish */
{SBIT(GSM48_RR_SAPI3ST_IDLE),
RSL_MT_EST_IND, gsm48_rr_estab_ind_sapi3},
/* establish */
{SBIT(GSM48_RR_SAPI3ST_IDLE) | SBIT(GSM48_RR_SAPI3ST_WAIT_EST),
RSL_MT_EST_CONF, gsm48_rr_estab_cnf_sapi3},
/* data transfer */
{SBIT(GSM48_RR_SAPI3ST_ESTAB),
RSL_MT_DATA_IND, gsm48_rr_data_ind_sapi3},
/* release */
{SBIT(GSM48_RR_SAPI3ST_WAIT_EST) | SBIT(GSM48_RR_SAPI3ST_ESTAB),
RSL_MT_REL_IND, gsm48_rr_rel_ind_sapi3},
{ALL_STATES,
RSL_MT_ERROR_IND, gsm48_rr_mdl_error_ind},
};
#define DLDATASLLENS3 \
(sizeof(dldatastatelists3) / sizeof(struct dldatastate))
static int gsm48_rcv_rll(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
int msg_type = rllh->c.msg_type;
int link_id = rllh->link_id;
int i;
int rc;
LOGP(DRSL, LOGL_INFO, "(ms %s) Received '%s' from L2 in state "
"%s (link_id 0x%x)\n", ms->name, rsl_msg_name(msg_type),
gsm48_rr_state_names[rr->state], link_id);
/* find function for current state and message */
if (!(link_id & 7)) {
/* SAPI 0 */
for (i = 0; i < DLDATASLLEN; i++)
if ((msg_type == dldatastatelist[i].type)
&& ((1 << rr->state) & dldatastatelist[i].states))
break;
if (i == DLDATASLLEN) {
LOGP(DRSL, LOGL_NOTICE, "RSLms message '%s' "
"unhandled\n", rsl_msg_name(msg_type));
msgb_free(msg);
return 0;
}
rc = dldatastatelist[i].rout(ms, msg);
} else {
/* SAPI 3 */
for (i = 0; i < DLDATASLLENS3; i++)
if ((msg_type == dldatastatelists3[i].type)
&& ((1 << rr->sapi3_state) &
dldatastatelists3[i].states))
break;
if (i == DLDATASLLENS3) {
LOGP(DRSL, LOGL_NOTICE, "RSLms message '%s' "
"unhandled\n", rsl_msg_name(msg_type));
msgb_free(msg);
return 0;
}
rc = dldatastatelists3[i].rout(ms, msg);
}
/* free msgb unless it is forwarded */
if (msg_type != RSL_MT_DATA_IND)
msgb_free(msg);
return rc;
}
static int gsm48_rcv_cch(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct abis_rsl_cchan_hdr *ch = msgb_l2(msg);
int msg_type = ch->c.msg_type;
int rc;
LOGP(DRSL, LOGL_INFO, "(ms %s) Received '%s' from L2 in state "
"%s\n", ms->name, rsl_msg_name(msg_type),
gsm48_rr_state_names[rr->state]);
if (rr->state == GSM48_RR_ST_CONN_PEND
&& msg_type == RSL_MT_CHAN_CONF) {
rc = gsm48_rr_tx_rand_acc(ms, msg);
msgb_free(msg);
return rc;
}
LOGP(DRSL, LOGL_NOTICE, "RSLms message unhandled\n");
msgb_free(msg);
return 0;
}
/* input function for L2 messages up to L3 */
static int gsm48_rcv_rsl(struct osmocom_ms *ms, struct msgb *msg)
{
struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
int rc = 0;
switch (rslh->msg_discr & 0xfe) {
case ABIS_RSL_MDISC_RLL:
rc = gsm48_rcv_rll(ms, msg);
break;
case ABIS_RSL_MDISC_COM_CHAN:
rc = gsm48_rcv_cch(ms, msg);
break;
default:
/* FIXME: implement this */
LOGP(DRSL, LOGL_NOTICE, "unknown RSLms msg_discr 0x%02x\n",
rslh->msg_discr);
msgb_free(msg);
rc = -EINVAL;
break;
}
return rc;
}
/* state trasitions for RR-SAP messages from up (main link) */
static struct rrdownstate {
uint32_t states;
int type;
int (*rout) (struct osmocom_ms *ms, struct msgb *msg);
} rrdownstatelist[] = {
/* SAPI 0 */
/* NOTE: If not IDLE, it is rejected there. */
{ALL_STATES, /* 3.3.1.1 */
GSM48_RR_EST_REQ, gsm48_rr_est_req},
{SBIT(GSM48_RR_ST_DEDICATED), /* 3.4.2 */
GSM48_RR_DATA_REQ, gsm48_rr_data_req},
{SBIT(GSM48_RR_ST_CONN_PEND) |
SBIT(GSM48_RR_ST_DEDICATED), /* 3.4.13.3 */
GSM48_RR_ABORT_REQ, gsm48_rr_abort_req},
};
#define RRDOWNSLLEN \
(sizeof(rrdownstatelist) / sizeof(struct rrdownstate))
/* state trasitions for RR-SAP messages from up with (SAPI 3) */
static struct rrdownstate rrdownstatelists3[] = {
/* SAPI 3 */
{SBIT(GSM48_RR_SAPI3ST_IDLE),
GSM48_RR_EST_REQ, gsm48_rr_est_req_sapi3},
{SBIT(GSM48_RR_SAPI3ST_ESTAB),
GSM48_RR_EST_REQ, gsm48_rr_est_req_estab_sapi3},
{SBIT(GSM48_RR_SAPI3ST_ESTAB),
GSM48_RR_DATA_REQ, gsm48_rr_data_req}, /* handles SAPI 3 too */
};
#define RRDOWNSLLENS3 \
(sizeof(rrdownstatelists3) / sizeof(struct rrdownstate))
int gsm48_rr_downmsg(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct gsm48_rr_hdr *rrh = (struct gsm48_rr_hdr *) msg->data;
int msg_type = rrh->msg_type;
int sapi = rrh->sapi;
int i;
int rc;
LOGP(DRR, LOGL_INFO, "(ms %s) Message '%s' received in state %s "
"(sapi %d)\n", ms->name, get_rr_name(msg_type),
gsm48_rr_state_names[rr->state], sapi);
if (!sapi) {
/* SAPI 0: find function for current state and message */
for (i = 0; i < RRDOWNSLLEN; i++)
if ((msg_type == rrdownstatelist[i].type)
&& ((1 << rr->state) & rrdownstatelist[i].states))
break;
if (i == RRDOWNSLLEN) {
LOGP(DRR, LOGL_NOTICE, "Message unhandled at this "
"state.\n");
msgb_free(msg);
return 0;
}
rc = rrdownstatelist[i].rout(ms, msg);
} else {
/* SAPI 3: find function for current state and message */
for (i = 0; i < RRDOWNSLLENS3; i++)
if ((msg_type == rrdownstatelists3[i].type)
&& ((1 << rr->sapi3_state)
& rrdownstatelists3[i].states))
break;
if (i == RRDOWNSLLENS3) {
LOGP(DRR, LOGL_NOTICE, "Message unhandled at this "
"state.\n");
msgb_free(msg);
return 0;
}
rc = rrdownstatelists3[i].rout(ms, msg);
}
/* free msgb unless it is forwarded */
if (msg_type != GSM48_RR_DATA_REQ)
msgb_free(msg);
return rc;
}
/*
* init/exit
*/
int gsm48_rr_init(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
memset(rr, 0, sizeof(*rr));
rr->ms = ms;
LOGP(DRR, LOGL_INFO, "init Radio Ressource process\n");
INIT_LLIST_HEAD(&rr->rsl_upqueue);
INIT_LLIST_HEAD(&rr->downqueue);
/* downqueue is handled here, so don't add_work */
lapdm_channel_set_l3(&ms->lapdm_channel, &rcv_rsl, ms);
start_rr_t_meas(rr, 1, 0);
rr->audio_mode = AUDIO_TX_MICROPHONE | AUDIO_RX_SPEAKER;
rr->tch_loop_mode = L1CTL_TCH_LOOP_OPEN;
return 0;
}
int gsm48_rr_exit(struct osmocom_ms *ms)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *msg;
LOGP(DRR, LOGL_INFO, "exit Radio Ressource process\n");
/* flush queues */
while ((msg = msgb_dequeue(&rr->rsl_upqueue)))
msgb_free(msg);
while ((msg = msgb_dequeue(&rr->downqueue)))
msgb_free(msg);
if (rr->rr_est_msg) {
msgb_free(rr->rr_est_msg);
rr->rr_est_msg = NULL;
}
stop_rr_t_meas(rr);
stop_rr_t_starting(rr);
stop_rr_t_rel_wait(rr);
stop_rr_t3110(rr);
stop_rr_t3122(rr);
stop_rr_t3124(rr);
stop_rr_t3126(rr);
return 0;
}
#if 0
todo rr_sync_ind when receiving ciph, re ass, channel mode modify
static void timeout_rr_t3124(void *arg)
{
struct gsm48_rrlayer *rr = arg;
struct msgb *nmsg;
/* stop sending more access bursts when timer expired */
hando_acc_left = 0;
/* get old channel description */
memcpy(&rr->chan_desc, &rr->chan_last, sizeof(rr->chan_desc));
/* change radio to old channel */
tx_ph_dm_est_req(ms, rr->cd_now.arfcn, rr->cd_now.chan_nr,
rr->cd_now.tsc);
rr->dm_est = 1;
/* re-establish old link */
nmsg = gsm48_l3_msgb_alloc();
if (!nmsg)
return -ENOMEM;
return gsm48_send_rsl(ms, RSL_MT_REEST_REQ, nmsg, 0);
todo
}
static void start_rr_t3124(struct gsm48_rrlayer *rr, int sec, int micro)
{
LOGP(DRR, LOGL_INFO, "starting T3124 with %d.%03d seconds\n", sec,
micro / 1000);
rr->t3124.cb = timeout_rr_t3124;
rr->t3124.data = rr;
osmo_timer_schedule(&rr->t3124, sec, micro);
}
/* send HANDOVER ACCESS burst (9.1.14) */
static int gsm48_rr_tx_hando_access(struct osmocom_ms *ms)
{
nmsg = msgb_alloc_headroom(20, 16, "HAND_ACCESS");
if (!nmsg)
return -ENOMEM;
*msgb_put(nmsg, 1) = rr->hando_ref;
todo burst
return gsm48_send_rsl(ms, RSL_MT_RAND_ACC_REQ, nmsg, 0);
}
/* send next channel request in dedicated state */
static int gsm48_rr_rand_acc_cnf_dedicated(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
struct msgb *nmsg;
int s;
if (rr->modify_state != GSM48_RR_MOD_HANDO) {
LOGP(DRR, LOGL_NOTICE, "Random access confirm, but not in handover state.\n");
return 0;
}
/* send up to four handover access bursts */
if (rr->hando_acc_left) {
rr->hando_acc_left--;
gsm48_rr_tx_hando_access(ms);
return;
}
/* start timer for sending next HANDOVER ACCESS bursts afterwards */
if (!osmo_timer_pending(&rr->t3124)) {
if (allocated channel is SDCCH)
start_rr_t3124(rr, GSM_T3124_675);
else
start_rr_t3124(rr, GSM_T3124_320);
}
if (!rr->n_chan_req) {
start_rr_t3126(rr, 5, 0); /* TODO improve! */
return 0;
}
rr->n_chan_req--;
/* wait for PHYSICAL INFORMATION message or T3124 timeout */
return 0;
}
#endif
#define LOG_FRAME_VERIFY(mode, level, fmt, args...) \
LOGP(DRR, level, "Voice frame, mode=%s: " fmt, get_value_string(gsm48_chan_mode_names, mode), ## args)
int voice_frame_verify(enum gsm48_chan_mode mode, uint8_t *frame, size_t frame_len)
{
switch (mode) {
case GSM48_CMODE_SPEECH_V1:
/* FIXME: this is FR only, check for TCH/F (FR) and TCH/H (HR) */
/* RFC 3551, section 4.5.8 GSM */
if (frame_len != GSM_FR_BYTES) {
LOG_FRAME_VERIFY(mode, LOGL_ERROR, "incorrect length (%zu != %u)\n", frame_len, GSM_FR_BYTES);
return -2;
}
if ((frame[0] >> 4) != 0xd) {
LOG_FRAME_VERIFY(mode, LOGL_ERROR, "incorrect magic (%u != 0xd)\n", frame[0] >> 4);
return -3;
}
break;
case GSM48_CMODE_SPEECH_EFR:
/* RFC 3551, section 4.5.9 GSM-EFR */
if (frame_len != GSM_EFR_BYTES) {
LOG_FRAME_VERIFY(mode, LOGL_ERROR, "incorrect length (%zu != %u)\n", frame_len, GSM_EFR_BYTES);
return -4;
}
if ((frame[0] >> 4) != 0xc) {
LOG_FRAME_VERIFY(mode, LOGL_ERROR, "incorrect magic (%u != 0xc)\n", frame[0] >> 4);
return -5;
}
break;
default:
LOG_FRAME_VERIFY(mode, LOGL_ERROR, "not implemented\n");
return -1;
}
return 0;
}
int gsm48_rr_tx_voice(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t ch_type, ch_subch, ch_ts;
struct l1ctl_traffic_req *tr;
if (!rr->dm_est) {
LOGP(DRR, LOGL_INFO, "Current channel is not active\n");
goto error;
}
rsl_dec_chan_nr(rr->cd_now.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ch_type != RSL_CHAN_Bm_ACCHs) {
LOGP(DRR, LOGL_INFO, "Current channel is not (yet) TCH/F\n");
goto error;
}
tr = (struct l1ctl_traffic_req *)msg->l2h;
if (voice_frame_verify(rr->cd_now.mode, tr->data, msgb_l2len(msg)) < 0)
goto error;
return l1ctl_tx_traffic_req(ms, msg, rr->cd_now.chan_nr, 0);
error:
msgb_free(msg);
return -ENOTSUP;
}
int gsm48_rr_audio_mode(struct osmocom_ms *ms, uint8_t mode)
{
struct gsm48_rrlayer *rr = &ms->rrlayer;
uint8_t ch_type, ch_subch, ch_ts;
LOGP(DRR, LOGL_INFO, "setting audio mode to %d\n", mode);
rr->audio_mode = mode;
if (!rr->dm_est)
return 0;
rsl_dec_chan_nr(rr->cd_now.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (ch_type != RSL_CHAN_Bm_ACCHs
&& ch_type != RSL_CHAN_Lm_ACCHs)
return 0;
return l1ctl_tx_tch_mode_req(ms, rr->cd_now.mode, mode, rr->tch_loop_mode);
}
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