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libosmo-gprs/src/rlcmac/rlcmac_prim.c

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/* GPRS Radio Resource SAP as per:
* 3GPP TS 44.060 4.3
* 3GPP TS 24.007 9.3
* 3GPP TS 44.064 7.2.3
*/
/*
* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <errno.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/crypt/gprs_cipher.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gprs/rlcmac/rlcmac.h>
#include <osmocom/gprs/rlcmac/rlcmac_prim.h>
#include <osmocom/gprs/rlcmac/rlcmac_private.h>
#include <osmocom/gprs/rlcmac/gre.h>
#include <osmocom/gprs/rlcmac/tbf_dl.h>
#include <osmocom/gprs/rlcmac/tbf_ul.h>
#include <osmocom/gprs/rlcmac/tbf_ul_ass_fsm.h>
#define RLCMAC_MSGB_HEADROOM 0
const struct value_string osmo_gprs_rlcmac_prim_sap_names[] = {
{ OSMO_GPRS_RLCMAC_SAP_GRR, "GRR" },
{ OSMO_GPRS_RLCMAC_SAP_GMMRR, "GMMRR" },
{ OSMO_GPRS_RLCMAC_SAP_L1CTL, "L1CTL" },
{ 0, NULL }
};
const struct value_string osmo_gprs_rlcmac_grr_prim_type_names[] = {
{ OSMO_GPRS_RLCMAC_GRR_DATA, "DATA" },
{ OSMO_GPRS_RLCMAC_GRR_UNITDATA, "UNITDATA" },
{ 0, NULL }
};
const struct value_string osmo_gprs_rlcmac_gmmrr_prim_type_names[] = {
{ OSMO_GPRS_RLCMAC_GMMRR_ASSIGN, "ASSIGN" },
{ OSMO_GPRS_RLCMAC_GMMRR_PAGE, "PAGE" },
{ 0, NULL }
};
const struct value_string osmo_gprs_rlcmac_l1ctl_prim_type_names[] = {
{ OSMO_GPRS_RLCMAC_L1CTL_RACH, "RACH" },
{ OSMO_GPRS_RLCMAC_L1CTL_CCCH_DATA, "CCCH_DATA" },
{ OSMO_GPRS_RLCMAC_L1CTL_PDCH_DATA, "PDCH_DATA" },
{ OSMO_GPRS_RLCMAC_L1CTL_PDCH_RTS, "PDCH_RTS" },
{ OSMO_GPRS_RLCMAC_L1CTL_CFG_UL_TBF, "CFG_UL_TBF" },
{ OSMO_GPRS_RLCMAC_L1CTL_CFG_DL_TBF, "CFG_DL_TBF" },
{ 0, NULL }
};
const char *osmo_gprs_rlcmac_prim_name(const struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
static char name_buf[256];
const char *sap = osmo_gprs_rlcmac_prim_sap_name(rlcmac_prim->oph.sap);
const char *op = get_value_string(osmo_prim_op_names, rlcmac_prim->oph.operation);
const char *type;
switch (rlcmac_prim->oph.sap) {
case OSMO_GPRS_RLCMAC_SAP_GRR:
type = osmo_gprs_rlcmac_grr_prim_type_name(rlcmac_prim->oph.primitive);
break;
case OSMO_GPRS_RLCMAC_SAP_GMMRR:
type = osmo_gprs_rlcmac_gmmrr_prim_type_name(rlcmac_prim->oph.primitive);
break;
case OSMO_GPRS_RLCMAC_SAP_L1CTL:
type = osmo_gprs_rlcmac_l1ctl_prim_type_name(rlcmac_prim->oph.primitive);
break;
default:
type = "unsupported-rlcmac-sap";
}
snprintf(name_buf, sizeof(name_buf), "%s-%s.%s", sap, type, op);
return name_buf;
}
static int rlcmac_up_cb_dummy(struct osmo_gprs_rlcmac_prim *rlcmac_prim, void *user_data)
{
LOGRLCMAC(LOGL_INFO, "rlcmac_up_cb_dummy(%s)\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
return 0;
}
static int rlcmac_down_cb_dummy(struct osmo_gprs_rlcmac_prim *rlcmac_prim, void *user_data)
{
LOGRLCMAC(LOGL_INFO, "rlcmac_down_cb_dummy(%s)\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
return 0;
}
/* Set callback used by LLC layer to push primitives to higher layers in protocol stack */
void osmo_gprs_rlcmac_prim_set_up_cb(osmo_gprs_rlcmac_prim_up_cb up_cb, void *up_user_data)
{
g_ctx->rlcmac_up_cb = up_cb;
g_ctx->rlcmac_up_cb_user_data = up_user_data;
}
/* Set callback used by LLC layer to push primitives to lower layers in protocol stack */
void osmo_gprs_rlcmac_prim_set_down_cb(osmo_gprs_rlcmac_prim_down_cb down_cb, void *down_user_data)
{
g_ctx->rlcmac_down_cb = down_cb;
g_ctx->rlcmac_down_cb_user_data = down_user_data;
}
/********************************
* Primitive allocation:
********************************/
/* allocate a msgb containing a struct osmo_gprs_rlcmac_prim + optional l3 data */
static struct msgb *gprs_rlcmac_prim_msgb_alloc(unsigned int l3_len)
{
const int headroom = RLCMAC_MSGB_HEADROOM;
const int size = headroom + sizeof(struct osmo_gprs_rlcmac_prim) + l3_len;
struct msgb *msg = msgb_alloc_headroom(size, headroom, "rlcmac_prim");
if (!msg)
return NULL;
msg->l1h = msgb_put(msg, sizeof(struct osmo_gprs_rlcmac_prim));
return msg;
}
static struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc(enum osmo_gprs_rlcmac_prim_sap sap,
unsigned int type,
enum osmo_prim_operation operation,
unsigned int l3_len)
{
struct msgb *msg = gprs_rlcmac_prim_msgb_alloc(l3_len);
struct osmo_gprs_rlcmac_prim *rlcmac_prim = msgb_rlcmac_prim(msg);
osmo_prim_init(&rlcmac_prim->oph, sap, type, operation, msg);
return rlcmac_prim;
}
static inline
struct osmo_gprs_rlcmac_prim *rlcmac_prim_grr_alloc(enum osmo_gprs_rlcmac_grr_prim_type type,
enum osmo_prim_operation operation,
unsigned int l3_len)
{
return gprs_rlcmac_prim_alloc(OSMO_GPRS_RLCMAC_SAP_GRR, type, operation, l3_len);
}
static inline
struct osmo_gprs_rlcmac_prim *rlcmac_prim_gmmrr_alloc(enum osmo_gprs_rlcmac_gmmrr_prim_type type,
enum osmo_prim_operation operation,
unsigned int l3_len)
{
return gprs_rlcmac_prim_alloc(OSMO_GPRS_RLCMAC_SAP_GMMRR, type, operation, l3_len);
}
static inline
struct osmo_gprs_rlcmac_prim *rlcmac_prim_l1ctl_alloc(enum osmo_gprs_rlcmac_l1ctl_prim_type type,
enum osmo_prim_operation operation,
unsigned int l3_len)
{
return gprs_rlcmac_prim_alloc(OSMO_GPRS_RLCMAC_SAP_L1CTL, type, operation, l3_len);
}
/* 3GPP TS 44.064 7.2.3.2 GRR-UNITDATA.ind (MS):*/
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_grr_unitdata_ind(
uint32_t tlli, uint8_t *ll_pdu,
size_t ll_pdu_len)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_grr_alloc(OSMO_GPRS_RLCMAC_GRR_UNITDATA, PRIM_OP_INDICATION, ll_pdu_len);
rlcmac_prim->grr.tlli = tlli;
rlcmac_prim->grr.ll_pdu = ll_pdu;
rlcmac_prim->grr.ll_pdu_len = ll_pdu_len;
return rlcmac_prim;
}
/* 3GPP TS 44.064 7.2.3.2 GRR-UL-UNITDATA.req (MS):*/
struct osmo_gprs_rlcmac_prim *osmo_gprs_rlcmac_prim_alloc_grr_unitdata_req(
uint32_t tlli, uint8_t *ll_pdu, size_t ll_pdu_len)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_grr_alloc(OSMO_GPRS_RLCMAC_GRR_UNITDATA, PRIM_OP_REQUEST, ll_pdu_len);
rlcmac_prim->grr.tlli = tlli;
rlcmac_prim->grr.ll_pdu = ll_pdu;
rlcmac_prim->grr.ll_pdu_len = ll_pdu_len;
return rlcmac_prim;
}
/* 3GPP TS 24.007 9.3.2.1 GMMRR-ASSIGN-REQ:*/
struct osmo_gprs_rlcmac_prim *osmo_gprs_rlcmac_prim_alloc_gmmrr_assign_req(uint32_t new_tlli)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_gmmrr_alloc(OSMO_GPRS_RLCMAC_GMMRR_ASSIGN, PRIM_OP_REQUEST, 0);
rlcmac_prim->gmmrr.assign_req.new_tlli = new_tlli;
return rlcmac_prim;
}
/* 3GPP TS 24.007 9.3.2.2 GMMRR-PAGE-IND:*/
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_gmmrr_page_ind(uint32_t tlli)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_gmmrr_alloc(OSMO_GPRS_RLCMAC_GMMRR_PAGE, PRIM_OP_INDICATION, 0);
rlcmac_prim->gmmrr.page_ind.tlli = tlli;
return rlcmac_prim;
}
/* L1CTL-RACH.req (8bit) */
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_l1ctl_rach8_req(uint8_t ra)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_RACH, PRIM_OP_REQUEST, 0);
rlcmac_prim->l1ctl.rach_req.is_11bit = false;
rlcmac_prim->l1ctl.rach_req.ra = ra;
return rlcmac_prim;
}
/* L1CTL-RACH.req (11bit) */
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_l1ctl_rach11_req(uint16_t ra11, uint8_t synch_seq)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_RACH, PRIM_OP_REQUEST, 0);
rlcmac_prim->l1ctl.rach_req.is_11bit = true;
rlcmac_prim->l1ctl.rach_req.ra11 = ra11;
rlcmac_prim->l1ctl.rach_req.synch_seq = synch_seq;
return rlcmac_prim;
}
/* L1CTL-CCCH_DATA.ind */
struct osmo_gprs_rlcmac_prim *osmo_gprs_rlcmac_prim_alloc_l1ctl_ccch_data_ind(uint32_t fn, uint8_t *data)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_CCCH_DATA, PRIM_OP_INDICATION, 0);
rlcmac_prim->l1ctl.ccch_data_ind.fn = fn;
rlcmac_prim->l1ctl.ccch_data_ind.data = data;
return rlcmac_prim;
}
/* L1CTL-PDCH_DATA.req */
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_l1ctl_pdch_data_req(uint8_t ts_nr, uint32_t fn,
uint8_t *data, uint8_t data_len)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_PDCH_DATA, PRIM_OP_REQUEST, data_len);
rlcmac_prim->l1ctl.pdch_data_req.fn = fn;
rlcmac_prim->l1ctl.pdch_data_req.ts_nr = ts_nr;
rlcmac_prim->l1ctl.pdch_data_req.data_len = data_len;
rlcmac_prim->l1ctl.pdch_data_req.data = data;
return rlcmac_prim;
}
/* L1CTL-PDCH_DATA.ind */
struct osmo_gprs_rlcmac_prim *osmo_gprs_rlcmac_prim_alloc_l1ctl_pdch_data_ind(uint8_t ts_nr, uint32_t fn,
uint8_t rx_lev, uint16_t ber10k, int16_t ci_cb, uint8_t *data, uint8_t data_len)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_PDCH_DATA, PRIM_OP_INDICATION, data_len);
rlcmac_prim->l1ctl.pdch_data_ind.fn = fn;
rlcmac_prim->l1ctl.pdch_data_ind.ts_nr = ts_nr;
rlcmac_prim->l1ctl.pdch_data_ind.rx_lev = rx_lev;
rlcmac_prim->l1ctl.pdch_data_ind.ber10k = ber10k;
rlcmac_prim->l1ctl.pdch_data_ind.ci_cb = ci_cb;
rlcmac_prim->l1ctl.pdch_data_ind.data_len = data_len;
rlcmac_prim->l1ctl.pdch_data_ind.data = data;
return rlcmac_prim;
}
/* L1CTL-PDCH_RTS.ind */
struct osmo_gprs_rlcmac_prim *osmo_gprs_rlcmac_prim_alloc_l1ctl_pdch_rts_ind(uint8_t ts_nr, uint32_t fn, uint8_t usf)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_PDCH_RTS, PRIM_OP_INDICATION, 0);
rlcmac_prim->l1ctl.pdch_rts_ind.fn = fn;
rlcmac_prim->l1ctl.pdch_rts_ind.ts_nr = ts_nr;
rlcmac_prim->l1ctl.pdch_rts_ind.usf = usf;
return rlcmac_prim;
}
/* L1CTL-CFG_DL_TBF.req */
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_l1ctl_cfg_dl_tbf_req(uint8_t tbf_nr, uint8_t slotmask, uint8_t dl_tfi)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_CFG_DL_TBF, PRIM_OP_REQUEST, 0);
rlcmac_prim->l1ctl.cfg_dl_tbf_req.dl_tbf_nr = tbf_nr;
rlcmac_prim->l1ctl.cfg_dl_tbf_req.dl_slotmask = slotmask;
rlcmac_prim->l1ctl.cfg_dl_tbf_req.dl_tfi = dl_tfi;
return rlcmac_prim;
}
/* L1CTL-CFG_UL_TBF.req */
struct osmo_gprs_rlcmac_prim *gprs_rlcmac_prim_alloc_l1ctl_cfg_ul_tbf_req(uint8_t ul_tbf_nr, uint8_t ul_slotmask)
{
struct osmo_gprs_rlcmac_prim *rlcmac_prim;
rlcmac_prim = rlcmac_prim_l1ctl_alloc(OSMO_GPRS_RLCMAC_L1CTL_CFG_UL_TBF, PRIM_OP_REQUEST, 0);
rlcmac_prim->l1ctl.cfg_ul_tbf_req.ul_tbf_nr = ul_tbf_nr;
rlcmac_prim->l1ctl.cfg_ul_tbf_req.ul_slotmask = ul_slotmask;
return rlcmac_prim;
}
int gprs_rlcmac_prim_handle_unsupported(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
LOGRLCMAC(LOGL_ERROR, "Unsupported rlcmac_prim! %s\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
msgb_free(rlcmac_prim->oph.msg);
return -ENOTSUP;
}
/********************************
* Handling from/to upper layers:
********************************/
static int rlcmac_prim_handle_grr_data_req(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc = gprs_rlcmac_prim_handle_unsupported(rlcmac_prim);
return rc;
}
static int rlcmac_prim_handle_grr_unitdata_req(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
struct gprs_rlcmac_entity *gre;
int rc;
gre = gprs_rlcmac_find_entity_by_tlli(rlcmac_prim->grr.tlli);
if (!gre) {
LOGRLCMAC(LOGL_INFO, "TLLI=0x%08x not found, creating entity on the fly\n",
rlcmac_prim->grr.tlli);
gre = gprs_rlcmac_entity_alloc(rlcmac_prim->grr.tlli);
}
OSMO_ASSERT(gre);
rc = gprs_rlcmac_entity_llc_enqueue(gre,
rlcmac_prim->grr.ll_pdu,
rlcmac_prim->grr.ll_pdu_len,
rlcmac_prim->grr.unitdata_req.sapi,
rlcmac_prim->grr.unitdata_req.radio_prio);
msgb_free(rlcmac_prim->oph.msg);
return rc;
}
int gprs_rlcmac_prim_call_up_cb(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
if (g_ctx->rlcmac_up_cb)
rc = g_ctx->rlcmac_up_cb(rlcmac_prim, g_ctx->rlcmac_up_cb_user_data);
else
rc = rlcmac_up_cb_dummy(rlcmac_prim, g_ctx->rlcmac_up_cb_user_data);
/* Special return value '1' means: do not free */
if (rc != 1)
msgb_free(rlcmac_prim->oph.msg);
else
rc = 0;
return rc;
}
static int gprs_rlcmac_prim_grr_upper_down(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
switch (OSMO_PRIM_HDR(&rlcmac_prim->oph)) {
case OSMO_PRIM(OSMO_GPRS_RLCMAC_GRR_DATA, PRIM_OP_REQUEST):
rc = rlcmac_prim_handle_grr_data_req(rlcmac_prim);
break;
case OSMO_PRIM(OSMO_GPRS_RLCMAC_GRR_UNITDATA, PRIM_OP_REQUEST):
rc = rlcmac_prim_handle_grr_unitdata_req(rlcmac_prim);
break;
default:
rc = -ENOTSUP;
}
return rc;
}
static int rlcmac_prim_handle_gmmrr_assign_req(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
struct gprs_rlcmac_entity *gre;
gre = gprs_rlcmac_find_entity_by_tlli(rlcmac_prim->gmmrr.assign_req.new_tlli);
if (!gre) {
LOGRLCMAC(LOGL_INFO, "GMMRR-ASSIGN.req: creating new entity TLLI=0x%08x\n",
rlcmac_prim->gmmrr.assign_req.new_tlli);
gre = gprs_rlcmac_entity_alloc(rlcmac_prim->gmmrr.assign_req.new_tlli);
OSMO_ASSERT(gre);
} else {
LOGRLCMAC(LOGL_INFO, "GMMRR-ASSIGN.req: TLLI=0x%08x already exists\n",
rlcmac_prim->gmmrr.assign_req.new_tlli);
}
msgb_free(rlcmac_prim->oph.msg);
return 0;
}
static int gprs_rlcmac_prim_gmmrr_upper_down(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
switch (OSMO_PRIM_HDR(&rlcmac_prim->oph)) {
case OSMO_PRIM(OSMO_GPRS_RLCMAC_GMMRR_ASSIGN, PRIM_OP_REQUEST):
rc = rlcmac_prim_handle_gmmrr_assign_req(rlcmac_prim);
break;
default:
rc = -ENOTSUP;
}
return rc;
}
/* RLC/MAC higher layers (RLCMAC) push GRR/GMMRR primitive down to RLC/MAC layer: */
int osmo_gprs_rlcmac_prim_upper_down(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
LOGRLCMAC(LOGL_INFO, "Rx from upper layers: %s\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
switch (rlcmac_prim->oph.sap) {
case OSMO_GPRS_RLCMAC_SAP_GRR:
rc = gprs_rlcmac_prim_grr_upper_down(rlcmac_prim);
break;
case OSMO_GPRS_RLCMAC_SAP_GMMRR:
rc = gprs_rlcmac_prim_gmmrr_upper_down(rlcmac_prim);
break;
default:
rc = gprs_rlcmac_prim_handle_unsupported(rlcmac_prim);
}
return rc;
}
/********************************
* Handling from/to lower layers:
********************************/
int gprs_rlcmac_prim_call_down_cb(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
LOGRLCMAC(LOGL_DEBUG, "Tx to lower layers: %s\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
if (g_ctx->rlcmac_down_cb)
rc = g_ctx->rlcmac_down_cb(rlcmac_prim, g_ctx->rlcmac_down_cb_user_data);
else
rc = rlcmac_down_cb_dummy(rlcmac_prim, g_ctx->rlcmac_down_cb_user_data);
/* Special return value '1' means: do not free */
if (rc != 1)
msgb_free(rlcmac_prim->oph.msg);
else
rc = 0;
return rc;
}
static int rlcmac_prim_handle_l1ctl_pdch_rts_ind(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
struct gprs_rlcmac_rts_block_ind bi = {
.ts = rlcmac_prim->l1ctl.pdch_rts_ind.ts_nr,
.fn = rlcmac_prim->l1ctl.pdch_rts_ind.fn,
.usf = rlcmac_prim->l1ctl.pdch_rts_ind.usf,
};
rc = gprs_rlcmac_rcv_rts_block(&bi);
return rc;
}
static int rlcmac_prim_handle_l1ctl_pdch_data_ind(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
enum gprs_rlcmac_coding_scheme cs;
/* ignore empty DATA.ind */
if (OSMO_UNLIKELY(rlcmac_prim->l1ctl.pdch_data_ind.data_len == 0)) {
LOGRLCMAC(LOGL_DEBUG, "Dropping DL data block with length 0\n");
return 0;
}
cs = gprs_rlcmac_mcs_get_by_size_dl(rlcmac_prim->l1ctl.pdch_data_ind.data_len);
if (cs == GPRS_RLCMAC_CS_UNKNOWN) {
LOGRLCMAC(LOGL_ERROR, "Dropping DL data block with invalid length %u: %s\n",
rlcmac_prim->l1ctl.pdch_data_ind.data_len,
osmo_hexdump(rlcmac_prim->l1ctl.pdch_data_ind.data,
rlcmac_prim->l1ctl.pdch_data_ind.data_len));
return -EINVAL;
}
/* TODO: handle PTCCH/D (Packet Timing Control CHannel) blocks */
if ((rlcmac_prim->l1ctl.pdch_data_ind.fn % 104) == 12) {
LOGRLCMAC(LOGL_DEBUG, "Dropping PTCCH/D block (not implemented)\n");
return 0;
}
if (gprs_rlcmac_mcs_is_gprs(cs))
return gprs_rlcmac_handle_gprs_dl_block(rlcmac_prim, cs);
if (gprs_rlcmac_mcs_is_edge(cs)) {
LOGRLCMAC(LOGL_NOTICE, "RX EGPRS DL data block NOT SUPPORTED\n");
return -ENOTSUP;
}
/* Should never be reached. */
OSMO_ASSERT(0);
return -EINVAL;
}
static int rlcmac_prim_handle_l1ctl_ccch_data_ind(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
/* TODO: check if it's IMM_ASS: */
int rc;
switch (rlcmac_prim->l1ctl.ccch_data_ind.data[2]) {
case GSM48_MT_RR_IMM_ASS:
rc = gprs_rlcmac_handle_ccch_imm_ass((struct gsm48_imm_ass *)rlcmac_prim->l1ctl.ccch_data_ind.data,
rlcmac_prim->l1ctl.ccch_data_ind.fn);
break;
case GSM48_MT_RR_SYSINFO_13:
rc = gprs_rlcmac_handle_bcch_si13((struct gsm48_system_information_type_13 *)rlcmac_prim->l1ctl.ccch_data_ind.data);
break;
default:
rc = -ENOTSUP;
}
return rc;
}
static int gprs_rlcmac_prim_l1ctl_lower_up(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
switch (OSMO_PRIM_HDR(&rlcmac_prim->oph)) {
case OSMO_PRIM(OSMO_GPRS_RLCMAC_L1CTL_PDCH_RTS, PRIM_OP_INDICATION):
rc = rlcmac_prim_handle_l1ctl_pdch_rts_ind(rlcmac_prim);
break;
case OSMO_PRIM(OSMO_GPRS_RLCMAC_L1CTL_PDCH_DATA, PRIM_OP_INDICATION):
rc = rlcmac_prim_handle_l1ctl_pdch_data_ind(rlcmac_prim);
break;
case OSMO_PRIM(OSMO_GPRS_RLCMAC_L1CTL_CCCH_DATA, PRIM_OP_INDICATION):
rc = rlcmac_prim_handle_l1ctl_ccch_data_ind(rlcmac_prim);
break;
default:
rc = -ENOTSUP;
}
return rc;
}
int osmo_gprs_rlcmac_prim_lower_up(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
OSMO_ASSERT(g_ctx);
OSMO_ASSERT(rlcmac_prim);
struct msgb *msg = rlcmac_prim->oph.msg;
int rc;
LOGRLCMAC(LOGL_DEBUG, "Rx from lower layers: %s\n", osmo_gprs_rlcmac_prim_name(rlcmac_prim));
switch (rlcmac_prim->oph.sap) {
case OSMO_GPRS_RLCMAC_SAP_L1CTL:
rc = gprs_rlcmac_prim_l1ctl_lower_up(rlcmac_prim);
break;
default:
rc = -EINVAL;
}
/* Special return value '1' means: do not free */
if (rc != 1)
msgb_free(msg);
else
rc = 0;
return rc;
}
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