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add missing layer3.c file

This commit is contained in:
Harald Welte 2010-03-02 23:37:12 +01:00
parent 911e0ff962
commit 177ffa3c5f
1 changed files with 96 additions and 0 deletions
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96
src/host/layer2/src/layer3.c Normal file
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#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <osmocore/msgb.h>
#include <osmocore/rsl.h>
#include <osmocore/tlv.h>
#include <osmocore/protocol/gsm_04_08.h>
#include <osmocom/lapdm.h>
#include <osmocom/rslms.h>
#include <osmocom/layer3.h>
#include <osmocom/osmocom_data.h>
#include <osmocom/layer2.h>
/* send location updating request * (as part of RSLms EST IND /
LAPDm SABME) */
static int gsm48_tx_loc_upd_req(struct osmocom_ms *ms, uint8_t chan_nr)
{
struct msgb *msg = msgb_alloc_headroom(256, 16, "loc_upd_req");
struct gsm48_hdr *gh;
struct gsm48_loc_upd_req *lu_r;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_LOC_UPD_REQUEST;
lu_r = (struct gsm48_loc_upd_req *) msgb_put(msg, sizeof(*lu_r));
lu_r->type = GSM48_LUPD_IMSI_ATT;
lu_r->key_seq = 0;
/* FIXME: set LAI and CM1 */
/* FIXME: set MI */
lu_r->mi_len = 0;
return rslms_tx_rll_req_l3(ms, RSL_MT_EST_REQ, chan_nr, 0, msg);
}
static int gsm48_rx_imm_ass(struct msgb *msg, struct osmocom_ms *ms)
{
struct gsm48_imm_ass *ia = msgb_l3(msg);
uint8_t ch_type, ch_subch, ch_ts;
uint16_t arfcn;
rsl_dec_chan_nr(ia->chan_desc.chan_nr, &ch_type, &ch_subch, &ch_ts);
arfcn = ia->chan_desc.h0.arfcn_low | (ia->chan_desc.h0.arfcn_high << 8);
printf("GSM48 IMM ASS (ra=0x%02x, chan_nr=0x%02x, ARFCN=%u, TS=%u, SS=%u, TSC=%u) ",
ia->req_ref.ra, ia->chan_desc.chan_nr, arfcn, ch_ts, ch_subch,
ia->chan_desc.h0.tsc);
/* FIXME: compare RA and GSM time with when we sent RACH req */
/* check if we can support this type of channel at the moment */
if (ch_type != RSL_CHAN_SDCCH4_ACCH || ch_ts != 0 ||
ia->chan_desc.h0.h == 1) {
printf("UNSUPPORTED!\n");
return 0;
}
/* request L1 to go to dedicated mode on assigned channel */
tx_ph_dm_est_req(ms, arfcn, ia->chan_desc.chan_nr);
/* request L2 to establish the SAPI0 connection */
gsm48_tx_loc_upd_req(ms, ia->chan_desc.chan_nr);
return 0;
}
int gsm48_rx_ccch(struct msgb *msg, struct osmocom_ms *ms)
{
struct gsm48_system_information_type_header *sih = msgb_l3(msg);
int rc = 0;
if (sih->rr_protocol_discriminator != GSM48_PDISC_RR)
printf("PCH pdisc != RR\n");
switch (sih->system_information) {
case GSM48_MT_RR_PAG_REQ_1:
case GSM48_MT_RR_PAG_REQ_2:
case GSM48_MT_RR_PAG_REQ_3:
/* FIXME: implement decoding of paging request */
break;
case GSM48_MT_RR_IMM_ASS:
rc = gsm48_rx_imm_ass(msg, ms);
break;
default:
printf("unknown PCH/AGCH type 0x%02x\n", sih->system_information);
rc = -EINVAL;
}
return rc;
}
int gsm48_rx_dcch(struct msgb *msg, struct osmocom_ms *ms)
{
return -EINVAL;
}