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-rw-r--r--configure.ac2
-rw-r--r--src/.gitignore6
-rw-r--r--src/Makefile.am18
-rw-r--r--src/gprs_bssgp_pcu.cpp291
-rw-r--r--src/gprs_bssgp_pcu.h19
-rw-r--r--src/gprs_debug.cpp15
-rw-r--r--src/gprs_debug.h3
-rw-r--r--src/gprs_rlcmac.cpp1328
-rw-r--r--src/gprs_rlcmac.h248
-rw-r--r--src/gprs_rlcmac_data.cpp1409
-rw-r--r--src/gprs_rlcmac_sched.cpp184
-rw-r--r--src/gsmL1prim.h415
-rw-r--r--src/openbts_sock.cpp183
-rw-r--r--src/pcu_l1_if.cpp568
-rw-r--r--src/pcu_l1_if.h22
-rw-r--r--src/pcu_main.cpp131
-rw-r--r--src/pcuif_proto.h137
-rw-r--r--src/sysmo_l1_if.cpp562
-rw-r--r--src/sysmo_sock.cpp303
-rw-r--r--src/tbf.txt111
20 files changed, 3586 insertions, 2369 deletions
diff --git a/configure.ac b/configure.ac
index 9fe9fdd..c572c88 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@ dnl checks for libraries
PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.3.9)
PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty)
PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 0.3.3)
-PKG_CHECK_MODULES(LIBOSMOGB, libosmogb >= 0.5.2)
+PKG_CHECK_MODULES(LIBOSMOGB, libosmogb >= 0.5.1.4)
AC_MSG_CHECKING([whether to enable sysmocom-bts hardware support])
AC_ARG_ENABLE(sysmocom-bts,
diff --git a/src/.gitignore b/src/.gitignore
new file mode 100644
index 0000000..9cf9852
--- /dev/null
+++ b/src/.gitignore
@@ -0,0 +1,6 @@
+.gitignore
+.libs/
+RLCMACTest
+libgprs.la
+pcu
+
diff --git a/src/Makefile.am b/src/Makefile.am
index b7b9885..ca586fd 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -18,12 +18,8 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
-# FIXME: This has to go!!
-OPENBSC_DIR = $(top_srcdir)/../openbsc/openbsc
-OPENGGSN_DIR = $(top_srcdir)/../openggsn
-
-AM_CPPFLAGS = $(STD_DEFINES_AND_INCLUDES) -I$(OPENBSC_DIR)/include
-AM_CXXFLAGS = -Wall -ldl -pthread -lgtp
+AM_CPPFLAGS = $(STD_DEFINES_AND_INCLUDES)
+AM_CXXFLAGS = -Wall -ldl -pthread
noinst_LTLIBRARIES = libgprs.la
@@ -33,15 +29,18 @@ libgprs_la_SOURCES = \
gsm_rlcmac.cpp \
gprs_bssgp_pcu.cpp \
gprs_rlcmac.cpp \
+ gprs_rlcmac_data.cpp \
+ gprs_rlcmac_sched.cpp \
gsm_timer.cpp \
- bitvector.cpp
+ bitvector.cpp \
+ pcu_l1_if.cpp
if ENABLE_SYSMOBTS
libgprs_la_SOURCES += \
- sysmo_l1_if.cpp
+ sysmo_sock.cpp
else
libgprs_la_SOURCES += \
- pcu_l1_if.cpp
+ openbts_sock.cpp
endif
noinst_PROGRAMS = \
@@ -54,6 +53,7 @@ noinst_HEADERS = \
gsm_rlcmac.h \
gprs_bssgp_pcu.h \
gprs_rlcmac.h \
+ pcuif_proto.h \
pcu_l1_if.h \
gsm_timer.h \
bitvector.h
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp
index 2dfaba3..f9a421a 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -23,19 +23,24 @@
struct sgsn_instance *sgsn;
void *tall_bsc_ctx;
-struct bssgp_bvc_ctx *bctx = btsctx_alloc(BVCI, NSEI);
+struct bssgp_bvc_ctx *bctx = NULL;
+struct gprs_nsvc *nsvc = NULL;
+extern uint16_t spoof_mcc, spoof_mnc;
int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
{
struct bssgp_ud_hdr *budh;
- int i = 0;
- uint8_t trx, ts;
- budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
-
+ int tfi;
+ uint32_t tlli;
+ int i, j;
+ uint8_t trx, ts;
+ uint8_t *data;
+ uint16_t len;
struct gprs_rlcmac_tbf *tbf;
- tbf = tbf_alloc(GPRS_RLCMAC_DL_TBF, ntohl(budh->tlli));
+ budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
+ tlli = ntohl(budh->tlli);
if (!tbf)
{
@@ -44,31 +49,88 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
/* LLC_PDU is mandatory IE */
if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU))
{
- LOGP(DBSSGP, LOGL_ERROR, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tbf->tlli);
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tlli);
return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
}
- tbf_dl_establish(tbf);
+ data = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
+ len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
+ if (len > sizeof(tbf->llc_frame))
+ {
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD IE_LLC_PDU too large\n", tlli);
+ return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
+ }
- uint8_t *llc_pdu = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
- uint16_t llc_pdu_len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
-
- tbf_dl_data_transfer(tbf, llc_pdu, llc_pdu_len);
-}
+ /* read IMSI. if no IMSI exists, use first paging block (any paging),
+ * because during attachment the IMSI might not be known, so the MS
+ * will listen to all paging blocks. */
+ char imsi[16] = "000";
+ if (TLVP_PRESENT(tp, BSSGP_IE_IMSI))
+ {
+ uint8_t imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
+ uint8_t *bcd_imsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_IMSI);
+ if ((bcd_imsi[0] & 0x08))
+ imsi_len = imsi_len * 2 - 1;
+ else
+ imsi_len = (imsi_len - 1) * 2;
+ for (i = 0, j = 0; j < imsi_len && j < 16; j++)
+ {
+ if (!(j & 1)) {
+ imsi[j] = (bcd_imsi[i] >> 4) + '0';
+ i++;
+ } else
+ imsi[j] = (bcd_imsi[i] & 0xf) + '0';
+ }
+ imsi[j] = '\0';
+ }
+ LOGP(DBSSGP, LOGL_INFO, "LLC [SGSN -> PCU] = TLLI: 0x%08x IMSI: %s len: %d\n", tlli, imsi, len);
-int gprs_bssgp_pcu_rx_paging_ps(struct msgb *msg, struct tlv_parsed *tp)
-{
- uint8_t *ptmsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_TMSI);
- uint16_t ptmsi_len = TLVP_LEN(tp, BSSGP_IE_TMSI);
+ /* check for existing TBF */
+ if ((tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) {
+ LOGP(DRLCMAC, LOGL_INFO, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli);
+ if (tbf->state == GPRS_RLCMAC_WAIT_RELEASE) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state "
+ "(T3193), so reuse TBF\n");
+ memcpy(tbf->llc_frame, data, len);
+ tbf->llc_length = len;
+ memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset
+ rlc states */
+ gprs_rlcmac_trigger_downlink_assignment(tbf, 1, NULL);
+ } else {
+ /* the TBF exists, so we must write it in the queue */
+ struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue");
+ if (!llc_msg)
+ return -ENOMEM;
+ memcpy(msgb_put(llc_msg, len), data, len);
+ msgb_enqueue(&tbf->llc_queue, llc_msg);
+ }
+ } else {
+ // Create new TBF
+ tfi = tfi_alloc(&trx, &ts);
+ if (tfi < 0) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
+ /* FIXME: send reject */
+ return -EBUSY;
+ }
+ tbf = tbf_alloc(tfi, trx, ts);
+ tbf->direction = GPRS_RLCMAC_DL_TBF;
+ tbf->tlli = tlli;
+ tbf->tlli_valid = 1;
- LOGP(DBSSGP, LOGL_NOTICE, " P-TMSI = ");
- for (int i = 0; i < ptmsi_len; i++)
- {
- LOGPC(DBSSGP, LOGL_NOTICE, "%02x", ptmsi[i]);
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] START TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
+
+ /* new TBF, so put first frame */
+ memcpy(tbf->llc_frame, data, len);
+ tbf->llc_length = len;
+
+ /* trigger downlink assignment and set state to ASSIGN.
+ * we don't use old_downlink, so the possible uplink is used
+ * to trigger downlink assignment. if there is no uplink,
+ * AGCH is used. */
+ gprs_rlcmac_trigger_downlink_assignment(tbf, 0, imsi);
}
- LOGPC(DBSSGP, LOGL_NOTICE, "\n");
- gprs_rlcmac_paging_request(ptmsi, ptmsi_len);
+ return 0;
}
/* Receive a BSSGP PDU from a BSS on a PTP BVCI */
@@ -90,26 +152,26 @@ int gprs_bssgp_pcu_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_
switch (pdu_type) {
case BSSGP_PDUT_DL_UNITDATA:
- LOGP(DBSSGP, LOGL_NOTICE, "RX: [SGSN->PCU] BSSGP_PDUT_DL_UNITDATA\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "RX: [SGSN->PCU] BSSGP_PDUT_DL_UNITDATA\n");
gprs_bssgp_pcu_rx_dl_ud(msg, tp);
break;
case BSSGP_PDUT_PAGING_PS:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_PAGING_PS\n");
break;
case BSSGP_PDUT_PAGING_CS:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_PAGING_CS\n");
break;
case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RA_CAPA_UPDATE_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_RA_CAPA_UPDATE_ACK\n");
break;
case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_BVC_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_FLOW_CONTROL_BVC_ACK\n");
break;
case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_MS_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_FLOW_CONTROL_MS_ACK\n");
break;
default:
- DEBUGP(DBSSGP, "BSSGP BVCI=%u PDU type 0x%02x unknown\n", bctx->bvci, pdu_type);
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP BVCI=%u PDU type 0x%02x unknown\n", bctx->bvci, pdu_type);
rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
break;
}
@@ -128,41 +190,40 @@ int gprs_bssgp_pcu_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp
/* FIXME: send NM_STATUS.ind to NM */
break;
case BSSGP_PDUT_SUSPEND_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_SUSPEND_ACK\n");
break;
case BSSGP_PDUT_SUSPEND_NACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_NACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_SUSPEND_NACK\n");
break;
case BSSGP_PDUT_BVC_RESET_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_RESET_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_BVC_RESET_ACK\n");
break;
case BSSGP_PDUT_PAGING_PS:
- LOGP(DBSSGP, LOGL_NOTICE, "RX: [SGSN->PCU] BSSGP_PDUT_PAGING_PS\n");
- gprs_bssgp_pcu_rx_paging_ps(msg, tp);
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_PAGING_PS\n");
break;
case BSSGP_PDUT_PAGING_CS:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_PAGING_CS\n");
break;
case BSSGP_PDUT_RESUME_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_RESUME_ACK\n");
break;
case BSSGP_PDUT_RESUME_NACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_NACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_RESUME_NACK\n");
break;
case BSSGP_PDUT_FLUSH_LL:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLUSH_LL\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_FLUSH_LL\n");
break;
case BSSGP_PDUT_BVC_BLOCK_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_SUSPEND_ACK\n");
break;
case BSSGP_PDUT_BVC_UNBLOCK_ACK:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_UNBLOCK_ACK\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_BVC_UNBLOCK_ACK\n");
break;
case BSSGP_PDUT_SGSN_INVOKE_TRACE:
- LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SGSN_INVOKE_TRACE\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BSSGP_PDUT_SGSN_INVOKE_TRACE\n");
break;
default:
- DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n", bctx->bvci, bgph->pdu_type);
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n", bctx->bvci, bgph->pdu_type);
rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
break;
}
@@ -178,6 +239,13 @@ int gprs_bssgp_pcu_rcvmsg(struct msgb *msg)
uint16_t ns_bvci = msgb_bvci(msg);
int data_len;
int rc = 0;
+ struct bssgp_bvc_ctx *bctx;
+
+ if (pdu_type == BSSGP_PDUT_STATUS) {
+ LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u received STATUS\n",
+ msgb_nsei(msg), ns_bvci);
+ return 0;
+ }
/* Identifiers from DOWN: NSEI, BVCI (both in msg->cb) */
@@ -196,12 +264,6 @@ int gprs_bssgp_pcu_rcvmsg(struct msgb *msg)
/* look-up or create the BTS context for this BVC */
bctx = btsctx_by_bvci_nsei(ns_bvci, msgb_nsei(msg));
- /* Only a RESET PDU can create a new BVC context */
- if (!bctx)
- {
- bctx = btsctx_alloc(ns_bvci, msgb_nsei(msg));
- }
-
if (!bctx && pdu_type != BSSGP_PDUT_BVC_RESET_ACK)
{
LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU "
@@ -219,17 +281,17 @@ int gprs_bssgp_pcu_rcvmsg(struct msgb *msg)
if (ns_bvci == BVCI_SIGNALLING)
{
- LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_SIGNALLING gprs_bssgp_rx_sign\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BVCI_SIGNALLING gprs_bssgp_rx_sign\n");
rc = gprs_bssgp_pcu_rx_sign(msg, &tp, bctx);
}
else if (ns_bvci == BVCI_PTM)
{
- LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTM bssgp_tx_status\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BVCI_PTM bssgp_tx_status\n");
rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg);
}
else
{
- LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTP gprs_bssgp_rx_ptp\n");
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BVCI_PTP gprs_bssgp_rx_ptp\n");
rc = gprs_bssgp_pcu_rx_ptp(msg, &tp, bctx);
}
return rc;
@@ -239,3 +301,128 @@ int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
{
return 0;
}
+
+static int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci)
+{
+ int rc = 0;
+ switch (event) {
+ case GPRS_NS_EVT_UNIT_DATA:
+ /* hand the message into the BSSGP implementation */
+ rc = gprs_bssgp_pcu_rcvmsg(msg);
+ break;
+ default:
+ LOGP(DPCU, LOGL_NOTICE, "RLCMAC: Unknown event %u from NS\n", event);
+ if (msg)
+ talloc_free(msg);
+ rc = -EIO;
+ break;
+ }
+ return rc;
+}
+
+static int nsvc_unblocked = 0;
+
+static int nsvc_signal_cb(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data)
+{
+ struct ns_signal_data *nssd;
+
+ if (subsys != SS_L_NS)
+ return -EINVAL;
+
+ nssd = (struct ns_signal_data *)signal_data;
+ if (nssd->nsvc != nsvc) {
+ LOGP(DPCU, LOGL_ERROR, "Signal received of unknown NSVC\n");
+ return -EINVAL;
+ }
+
+ switch (signal) {
+ case S_NS_UNBLOCK:
+ if (!nsvc_unblocked) {
+ nsvc_unblocked = 1;
+ LOGP(DPCU, LOGL_NOTICE, "NS-VC is unblocked.\n");
+ bssgp_tx_bvc_reset(bctx, bctx->bvci,
+ BSSGP_CAUSE_PROTO_ERR_UNSPEC);
+ }
+ break;
+ case S_NS_BLOCK:
+ if (nsvc_unblocked) {
+ nsvc_unblocked = 0;
+ LOGP(DPCU, LOGL_NOTICE, "NS-VC is blocked.\n");
+ }
+ break;
+ }
+
+ return 0;
+}
+
+/* create BSSGP/NS layer instances */
+int gprs_bssgp_create(uint32_t sgsn_ip, uint16_t sgsn_port, uint16_t nsei,
+ uint16_t nsvci, uint16_t bvci, uint16_t mcc, uint16_t mnc, uint16_t lac,
+ uint16_t rac, uint16_t cell_id)
+{
+ struct sockaddr_in dest;
+
+ if (bctx)
+ return 0; /* if already created, must return 0: no error */
+
+ bssgp_nsi = gprs_ns_instantiate(&sgsn_ns_cb, NULL);
+ if (!bssgp_nsi) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
+ return -EINVAL;
+ }
+ gprs_ns_nsip_listen(bssgp_nsi);
+
+ dest.sin_family = AF_INET;
+ dest.sin_port = htons(sgsn_port);
+ dest.sin_addr.s_addr = htonl(sgsn_ip);
+
+ nsvc = gprs_ns_nsip_connect(bssgp_nsi, &dest, nsei, nsvci);
+ if (!nsvc) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to create NSVCt\n");
+ gprs_ns_destroy(bssgp_nsi);
+ bssgp_nsi = NULL;
+ return -EINVAL;
+ }
+
+ bctx = btsctx_alloc(bvci, nsei);
+ if (!bctx) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to create BSSGP context\n");
+ nsvc = NULL;
+ gprs_ns_destroy(bssgp_nsi);
+ bssgp_nsi = NULL;
+ return -EINVAL;
+ }
+ bctx->ra_id.mcc = spoof_mcc ? : mcc;
+ bctx->ra_id.mnc = spoof_mnc ? : mnc;
+ bctx->ra_id.lac = lac;
+ bctx->ra_id.rac = rac;
+ bctx->cell_id = cell_id;
+
+ osmo_signal_register_handler(SS_L_NS, nsvc_signal_cb, NULL);
+
+// bssgp_tx_bvc_reset(bctx, bctx->bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC);
+
+ return 0;
+}
+
+void gprs_bssgp_destroy(void)
+{
+ if (!bssgp_nsi)
+ return;
+
+ osmo_signal_unregister_handler(SS_L_NS, nsvc_signal_cb, NULL);
+
+ nsvc = NULL;
+
+ /* FIXME: move this to libgb: btsctx_free() */
+ llist_del(&bctx->list);
+ talloc_free(bctx);
+ bctx = NULL;
+
+ /* FIXME: blocking... */
+
+ gprs_ns_destroy(bssgp_nsi);
+ bssgp_nsi = NULL;
+}
+
diff --git a/src/gprs_bssgp_pcu.h b/src/gprs_bssgp_pcu.h
index bf1e312..7d5f376 100644
--- a/src/gprs_bssgp_pcu.h
+++ b/src/gprs_bssgp_pcu.h
@@ -39,23 +39,10 @@ struct bssgp_bvc_ctx *btsctx_alloc(uint16_t bvci, uint16_t nsei);
}
#include <gprs_debug.h>
-#define BVCI 7
-#define NSEI 3
-
#define QOS_PROFILE 0
#define BSSGP_HDR_LEN 53
#define NS_HDR_LEN 4
-#define MAX_LEN_PDU 60
#define IE_LLC_PDU 14
-#define BLOCK_DATA_LEN 20
-#define BLOCK_LEN 23
-
-#define CELL_ID 0
-#define MNC 1
-#define MCC 001
-#define PCU_LAC 1
-#define PCU_RAC 0
-
extern struct bssgp_bvc_ctx *bctx;
@@ -67,4 +54,10 @@ int gprs_bssgp_pcu_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp
int gprs_bssgp_pcu_rcvmsg(struct msgb *msg);
+int gprs_bssgp_create(uint32_t sgsn_ip, uint16_t sgsn_port, uint16_t nsei,
+ uint16_t nsvci, uint16_t bvci, uint16_t mcc, uint16_t mnc, uint16_t lac,
+ uint16_t rac, uint16_t cell_id);
+
+void gprs_bssgp_destroy(void);
+
#endif // GPRS_BSSGP_PCU_H
diff --git a/src/gprs_debug.cpp b/src/gprs_debug.cpp
index 4b79cd6..bc19b77 100644
--- a/src/gprs_debug.cpp
+++ b/src/gprs_debug.cpp
@@ -33,12 +33,15 @@
/* default categories */
static const struct log_info_cat default_categories[] = {
- {"DCSN1", "\033[1;31m", "Concrete Syntax Notation One (CSN1)", LOGL_NOTICE, 1},
- {"DL1IF", "\033[1;32m", "GPRS PCU L1 interface (L1IF)", LOGL_NOTICE, 1},
- {"DRLCMAC", "\033[1;33m", "GPRS RLC/MAC layer (RLCMAC)", LOGL_NOTICE, 1},
- {"DRLCMACDATA", "\033[1;36m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_NOTICE, 1},
- {"DBSSGP", "\033[1;34m", "GPRS BSS Gateway Protocol (BSSGP)", LOGL_NOTICE , 1},
- {"DPCU", "\033[1;35m", "GPRS Packet Control Unit (PCU)", LOGL_NOTICE, 1}
+ {"DCSN1", "\033[1;31m", "Concrete Syntax Notation One (CSN1)", LOGL_INFO, 0},
+ {"DL1IF", "\033[1;32m", "GPRS PCU L1 interface (L1IF)", LOGL_INFO, 1},
+ {"DRLCMAC", "\033[0;33m", "GPRS RLC/MAC layer (RLCMAC)", LOGL_INFO, 1},
+ {"DRLCMACDATA", "\033[0;33m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_INFO, 1},
+ {"DRLCMACDL", "\033[1;33m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_INFO, 1},
+ {"DRLCMACUL", "\033[1;36m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_INFO, 1},
+ {"DRLCMACSCHED", "\033[0;36m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_INFO, 1},
+ {"DBSSGP", "\033[1;34m", "GPRS BSS Gateway Protocol (BSSGP)", LOGL_INFO , 1},
+ {"DPCU", "\033[1;35m", "GPRS Packet Control Unit (PCU)", LOGL_NOTICE, 1},
};
enum {
diff --git a/src/gprs_debug.h b/src/gprs_debug.h
index ee95e19..b5b4276 100644
--- a/src/gprs_debug.h
+++ b/src/gprs_debug.h
@@ -31,6 +31,9 @@ enum {
DL1IF,
DRLCMAC,
DRLCMACDATA,
+ DRLCMACDL,
+ DRLCMACUL,
+ DRLCMACSCHED,
DBSSGP,
DPCU,
aDebug_LastEntry
diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp
index 711fb61..9d2601c 100644
--- a/src/gprs_rlcmac.cpp
+++ b/src/gprs_rlcmac.cpp
@@ -1,6 +1,7 @@
/* gprs_rlcmac.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -20,506 +21,223 @@
#include <gprs_bssgp_pcu.h>
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
-#include <gsmL1prim.h>
LLIST_HEAD(gprs_rlcmac_tbfs);
void *rlcmac_tall_ctx;
-LLIST_HEAD(block_queue);
-int tfi_alloc()
+/* FIXME: spread ressources on multiple TRX */
+int tfi_alloc(uint8_t *_trx, uint8_t *_ts)
{
- struct gprs_rlcmac_tbf *tbf;
- uint32_t tfi_map = 0;
- uint32_t tfi_ind = 0;
- uint32_t mask = 1;
- uint8_t i;
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_pdch *pdch;
+ uint8_t trx, ts, tfi;
- llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
- tfi_ind = 1 << tbf->tfi;
- tfi_map = tfi_map|tfi_ind;
+ for (trx = 0; trx < 8; trx++) {
+ for (ts = 0; ts < 8; ts++) {
+ pdch = &bts->trx[trx].pdch[ts];
+ if (!pdch->enable)
+ continue;
+ break;
+ }
+ if (ts < 8)
+ break;
+ }
+ if (trx == 8) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
+ return -EINVAL;
+ }
+
+
+ LOGP(DRLCMAC, LOGL_DEBUG, "Searching for first unallocated TFI: "
+ "TRX=%d TS=%d\n", trx, ts);
+ for (tfi = 0; tfi < 32; tfi++) {
+ if (!pdch->tbf[tfi])
+ break;
}
- for (i = 0; i < 32; i++) {
- if(((tfi_map >> i) & mask) == 0) {
- return i;
+ if (tfi < 32) {
+ LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi);
+ *_trx = trx;
+ *_ts = ts;
+ return tfi;
+ }
+ LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
+
+ return -1;
+}
+
+int find_free_usf(uint8_t trx, uint8_t ts)
+{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_pdch *pdch;
+ struct gprs_rlcmac_tbf *tbf;
+ uint8_t usf_map = 0;
+ uint8_t tfi, usf;
+
+ if (trx >= 8 || ts >= 8)
+ return -EINVAL;
+ pdch = &bts->trx[trx].pdch[ts];
+
+ /* make map of used USF */
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = pdch->tbf[tfi];
+ if (!tbf)
+ continue;
+ if (tbf->direction != GPRS_RLCMAC_UL_TBF)
+ continue;
+ usf_map |= (1 << tbf->dir.ul.usf);
+ }
+
+ /* look for USF, don't use USF=7 */
+ for (usf = 0; usf < 7; usf++) {
+ if (!(usf_map & (1 << usf))) {
+ LOGP(DRLCMAC, LOGL_DEBUG, " Found USF=%d.\n", usf);
+ return usf;
}
}
+ LOGP(DRLCMAC, LOGL_NOTICE, "No USF available.\n");
+
return -1;
}
/* lookup TBF Entity (by TFI) */
-static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, gprs_rlcmac_tbf_direction dir)
+#warning FIXME: use pdch instance by trx and ts, because tfi is local
+struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, int direction)
{
struct gprs_rlcmac_tbf *tbf;
llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
- if ((tbf->tfi == tfi)&&(tbf->direction == dir))
+ if (tbf->state != GPRS_RLCMAC_RELEASING
+ && tbf->tfi == tfi
+ && tbf->direction == direction)
return tbf;
}
return NULL;
}
-static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, gprs_rlcmac_tbf_direction dir)
+/* search for active downlink or uplink tbf */
+struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, int direction)
{
struct gprs_rlcmac_tbf *tbf;
llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
- if ((tbf->tlli == tlli)&&(tbf->direction == dir))
+ if (tbf->state != GPRS_RLCMAC_RELEASING
+ && tbf->tlli == tlli
+ && tbf->direction == direction)
return tbf;
}
return NULL;
}
-static void tbf_free(struct gprs_rlcmac_tbf *tbf)
+#warning FIXME: use pdch instance by trx and ts, because polling is local
+struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn)
{
- llist_del(&tbf->list);
- talloc_free(tbf);
-}
-
-/* Lookup LLC PDU in TBF list of LLC PDUs by number. */
-static struct tbf_llc_pdu *tbf_llc_pdu_by_num(struct llist_head llc_pdus, uint8_t num)
-{
- struct tbf_llc_pdu *llc_pdu;
-
- llist_for_each_entry(llc_pdu, &llc_pdus, list) {
- if (llc_pdu->num == num)
- return llc_pdu;
- }
- return NULL;
-}
-
-/* Add new LLC PDU to the TBF list of LLC PDUs. */
-int tbf_add_llc_pdu(struct gprs_rlcmac_tbf *tbf, uint8_t *data, uint16_t llc_pdu_len)
-{
- struct tbf_llc_pdu *llc_pdu;
-
- llc_pdu = talloc_zero(rlcmac_tall_ctx, struct tbf_llc_pdu);
- if (!llc_pdu)
- return 0;
-
- llc_pdu->num = tbf->llc_pdu_list_len;
- llc_pdu->len = llc_pdu_len;
-
- LOGP(DBSSGP, LOGL_NOTICE, "LLC PDU = ");
- for (unsigned i = 0; i < llc_pdu_len; i++)
- {
- llc_pdu->data[i] = data[i];
- LOGPC(DBSSGP, LOGL_NOTICE, "%02x", llc_pdu->data[i]);
- }
- LOGPC(DBSSGP, LOGL_NOTICE, "\n");
-
- llist_add(&llc_pdu->list, &tbf->llc_pdus);
- tbf->llc_pdu_list_len++;
- return 1;
-}
-
-struct gprs_rlcmac_tbf *tbf_alloc(gprs_rlcmac_tbf_direction dir, uint32_t tlli)
-{
- struct gprs_rlcmac_tbf *exist_tbf;
struct gprs_rlcmac_tbf *tbf;
- uint8_t tfi;
- uint8_t trx, ts;
-
- // Downlink TDF allocation
- if (dir == GPRS_RLCMAC_DL_TBF)
- {
- // Try to find already exist DL TBF
- exist_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF);
- if (exist_tbf)
- {
- // if DL TBF is in establish or data transfer state,
- // send additional LLC PDU during current DL TBF.
- if (exist_tbf->stage != TBF_RELEASE)
- {
- if (exist_tbf->state != FINISH_DATA_TRANSFER)
- {
- return exist_tbf;
- }
- }
- }
-
- //Try to find already exist UL TBF
- exist_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
- if (exist_tbf)
- {
- // if UL TBF is in data transfer state,
- // establish new DL TBF during current UL TBF.
- if (exist_tbf->stage == TBF_DATA_TRANSFER && !(exist_tbf->next_tbf))
- {
- tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
- if (tbf)
- {
- // Create new TBF
- tfi = tfi_alloc();
- if (tfi < 0) {
- return NULL;
- }
-
- /* FIXME: select right TRX/TS */
- if (select_pdch(&trx, &ts)) {
- LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
- /* FIXME: send reject */
- return NULL;
- }
-
- tbf->tfi = tfi;
- tbf->trx = trx;
- tbf->ts = ts;
- tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
- tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
- tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
- tbf->llc_pdu_list_len = 0;
- tbf->direction = GPRS_RLCMAC_DL_TBF;
- tbf->stage = TBF_ESTABLISH;
- tbf->state = WAIT_ESTABLISH;
- tbf->tlli = tlli;
- llist_add(&tbf->list, &gprs_rlcmac_tbfs);
- exist_tbf->next_tbf = tbf;
- return tbf;
- }
- else
- {
- return NULL;
- }
- }
- }
-
- // No UL and DL TBFs for current TLLI are found.
- if (!exist_tbf)
- {
- tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
- if (tbf)
- {
- // Create new TBF
- tfi = tfi_alloc();
- if (tfi < 0) {
- return NULL;
- }
-
- /* FIXME: select right TRX/TS */
- if (select_pdch(&trx, &ts)) {
- LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
- /* FIXME: send reject */
- return NULL;
- }
-
- tbf->tfi = tfi;
- tbf->trx = trx;
- tbf->ts = ts;
- tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
- tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
- tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
- tbf->llc_pdu_list_len = 0;
- tbf->direction = GPRS_RLCMAC_DL_TBF;
- tbf->stage = TBF_ESTABLISH;
- tbf->state = CCCH_ESTABLISH;
- tbf->tlli = tlli;
- llist_add(&tbf->list, &gprs_rlcmac_tbfs);
- return tbf;
- }
- else
- {
- return NULL;
- }
- }
- }
- else
- {
- // Uplink TBF allocation
- tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
- if (tbf)
- {
- // Create new TBF
- tfi = tfi_alloc();
- if (tfi < 0) {
- return NULL;
- }
- if (select_pdch(&trx, &ts)) {
- LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
- /* FIXME: send reject */
- return NULL;
- }
- tbf->tfi = tfi;
- tbf->trx = trx;
- tbf->ts = ts;
- tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn;
- tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc;
- tbf->llc_pdus = LLIST_HEAD_INIT(tbf->llc_pdus);
- tbf->llc_pdu_list_len = 0;
- tbf->direction = GPRS_RLCMAC_UL_TBF;
- tbf->stage = TBF_ESTABLISH;
- tbf->state = WAIT_ESTABLISH;
- tbf->next_tbf = NULL;
- llist_add(&tbf->list, &gprs_rlcmac_tbfs);
+ llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) {
+ if (tbf->state != GPRS_RLCMAC_RELEASING
+ && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
+ && tbf->poll_fn == fn)
return tbf;
- }
- else
- {
- return NULL;
- }
- }
-}
-
-/* Management of uplink TBF establishment. */
-int tbf_ul_establish(struct gprs_rlcmac_tbf *tbf, uint8_t ra, uint32_t Fn, uint16_t qta)
-{
- if (tbf->direction != GPRS_RLCMAC_UL_TBF)
- {
- return -1;
- }
-
- if (tbf->stage == TBF_ESTABLISH)
- {
- switch (tbf->state) {
- case WAIT_ESTABLISH:
- {
- if (qta < 0)
- qta = 0;
- if (qta > 252)
- qta = 252;
- tbf->ta = qta >> 2;
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi);
- LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n",
- tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u Packet Immidiate Assignment\n", tbf->tfi);
- bitvec *immediate_assignment = bitvec_alloc(23);
- bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi);
- pcu_l1if_tx_agch(immediate_assignment, len);
- bitvec_free(immediate_assignment);
- tbf->state = FINISH_ESTABLISH;
- }
- break;
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
- tbf->tfi, tbf->state, tbf->stage);
- break;
- }
}
- else
- {
- return -1;
- }
- return 1;
-}
-
-/* Management of downlink TBF establishment. */
-int tbf_dl_establish(struct gprs_rlcmac_tbf *tbf)
-{
- if (tbf->direction != GPRS_RLCMAC_DL_TBF)
- {
- return -1;
- }
-
- if (tbf->stage == TBF_ESTABLISH)
- {
- switch (tbf->state) {
- case WAIT_ESTABLISH:
- // Wait while UL TBF establishes DL TBF.
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: Wait DL TBF establishment by UL TBF\n", tbf->tfi);
- break;
- case CCCH_ESTABLISH:
- // Downlink TBF Establishment on CCCH ( Immediate Assignment )
- tbf_gsm_timer_start(tbf, 1, 0);
- break;
- case PACCH_ESTABLISH:
- // Downlink TBF Establishment on PACCH ( Packet Immediate Assignment )
- gprs_rlcmac_packet_downlink_assignment(tbf);
- tbf->state = FINISH_ESTABLISH;
- break;
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
- tbf->tfi, tbf->state, tbf->stage);
- break;
- }
- }
- return 1;
+ return NULL;
}
-/* Management of uplink TBF data transfer. */
-int tbf_ul_data_transfer(struct gprs_rlcmac_tbf *tbf, RlcMacUplinkDataBlock_t * ul_data_block)
+struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi, uint8_t trx, uint8_t ts)
{
- if ((tbf->stage == TBF_RELEASE)||(tbf->direction != GPRS_RLCMAC_UL_TBF))
- {
- return -1;
- }
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_pdch *pdch;
+ struct gprs_rlcmac_tbf *tbf;
- if (tbf->stage == TBF_ESTABLISH)
- {
- tbf->stage = TBF_DATA_TRANSFER;
- tbf->state = WAIT_DATA_TRANSFER;
- }
+ LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n");
+ LOGP(DRLCMAC, LOGL_INFO, "Allocating TBF with TFI=%d.\n", tfi);
- if (ul_data_block->TI == 1)
- {
- tbf->tlli = ul_data_block->TLLI;
- // TODO: Kill all other UL TBFs with this TLLI.
- }
+ if (trx >= 8 || ts >= 8 || tfi >= 32)
+ return NULL;
+ pdch = &bts->trx[trx].pdch[ts];
- switch (tbf->state) {
- case WAIT_DATA_TRANSFER:
- if (ul_data_block->BSN == 0)
- {
- tbf->data_index = 0;
- gprs_rlcmac_data_block_parse(tbf, ul_data_block);
- gprs_rlcmac_tx_ul_ack(tbf->tfi, tbf->tlli, ul_data_block->CV ? 0: 1, ul_data_block->BSN);
- if (ul_data_block->CV == 0)
- {
- // Recieved last Data Block in this sequence.
- tbf->state = FINISH_DATA_TRANSFER;
- gprs_rlcmac_tx_ul_ud(tbf);
- }
- else
- {
- tbf->bsn = ul_data_block->BSN;
- tbf->state = DATA_TRANSFER;
- }
- }
- break;
- case DATA_TRANSFER:
- if (tbf->bsn == (ul_data_block->BSN - 1))
- {
- gprs_rlcmac_data_block_parse(tbf, ul_data_block);
-
- if (ul_data_block->CV == 0)
- {
- gprs_rlcmac_tx_ul_ack(tbf->tfi, tbf->tlli, 1, ul_data_block->BSN);
- // Recieved last Data Block in this sequence.
- tbf->state = FINISH_DATA_TRANSFER;
- gprs_rlcmac_tx_ul_ud(tbf);
- }
- else
- {
- tbf->bsn = ul_data_block->BSN;
- }
- }
- break;
- case FINISH_DATA_TRANSFER:
- // Now we just ignore all Data Blocks and wait release of TBF.
- break;
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
- tbf->tfi, tbf->state, tbf->stage);
- break;
- }
+ tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf);
+ if (!tbf)
+ return NULL;
- if ((tbf->state == FINISH_DATA_TRANSFER) && (tbf->next_tbf))
- {
- // Establish DL TBF, if it is required.
- if ((tbf->next_tbf)->state == WAIT_ESTABLISH)
- {
- (tbf->next_tbf)->state = PACCH_ESTABLISH;
- tbf_dl_establish(tbf->next_tbf);
- }
- }
+ tbf->tfi = tfi;
+ tbf->trx = trx;
+ tbf->ts = ts;
+ tbf->arfcn = bts->trx[trx].arfcn;
+ tbf->tsc = bts->trx[trx].pdch[ts].tsc;
+ tbf->pdch = pdch;
+ tbf->ws = 64;
+ tbf->sns = 128;
+ INIT_LLIST_HEAD(&tbf->llc_queue);
+ llist_add(&tbf->list, &gprs_rlcmac_tbfs);
+ pdch->tbf[tfi] = tbf;
- return 1;
+ return tbf;
}
-/* Management of downlink TBF data transfer. */
-int tbf_dl_data_transfer(struct gprs_rlcmac_tbf *tbf, uint8_t *llc_pdu, uint16_t llc_pdu_len)
+void tbf_free(struct gprs_rlcmac_tbf *tbf)
{
- if ((tbf->stage == TBF_RELEASE) || (tbf->direction != GPRS_RLCMAC_DL_TBF))
- {
- return -1;
- }
-
- if (llc_pdu_len > 0)
- {
- tbf_add_llc_pdu(tbf, llc_pdu, llc_pdu_len);
- }
-
- if (tbf->stage == TBF_ESTABLISH)
- {
- if (tbf->state == FINISH_ESTABLISH)
- {
- tbf->stage = TBF_DATA_TRANSFER;
- tbf->state = DATA_TRANSFER;
- }
- }
-
- if (tbf->stage == TBF_DATA_TRANSFER)
- {
- switch (tbf->state) {
- case DATA_TRANSFER:
- gprs_rlcmac_tx_llc_pdus(tbf);
- tbf->state = FINISH_DATA_TRANSFER;
- break;
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] TFI: %u Unexpected TBF state = %u for stage = %u \n",
- tbf->tfi, tbf->state, tbf->stage);
- break;
- }
- }
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_pdch *pdch;
+ struct msgb *msg;
- return 1;
+ LOGP(DRLCMAC, LOGL_INFO, "Free TBF=%d with TLLI=0x%08x.\n", tbf->tfi,
+ tbf->tlli);
+ tbf_timer_stop(tbf);
+ while ((msg = msgb_dequeue(&tbf->llc_queue)))
+ msgb_free(msg);
+ pdch = &bts->trx[tbf->trx].pdch[tbf->ts];
+ pdch->tbf[tbf->tfi] = NULL;
+ llist_del(&tbf->list);
+ LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n");
+ talloc_free(tbf);
}
-/* Management of uplink TBF release. */
-int tbf_ul_release(struct gprs_rlcmac_tbf *tbf)
-{
- if (tbf->direction != GPRS_RLCMAC_UL_TBF)
- {
- return -1;
- }
+const char *tbf_state_name[] = {
+ "NULL",
+ "ASSIGN",
+ "FLOW",
+ "FINISHED",
+ "WAIT RELEASE",
+ "RELEASING",
+};
- if (tbf->next_tbf)
- {
- // UL TBF data transfer is finished, start DL TBF data transfer.
- tbf_dl_data_transfer(tbf->next_tbf);
- }
- tbf->stage = TBF_RELEASE;
- tbf->state = RELEASE;
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
- tbf_free(tbf);
- return 1;
-}
-
-/* Management of downlink TBF release. */
-int tbf_dl_release(struct gprs_rlcmac_tbf *tbf)
+void tbf_new_state(struct gprs_rlcmac_tbf *tbf,
+ enum gprs_rlcmac_tbf_state state)
{
- if (tbf->direction != GPRS_RLCMAC_DL_TBF)
- {
- return -1;
- }
-
- tbf->stage = TBF_RELEASE;
- tbf->state = RELEASE;
- LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
- tbf_free(tbf);
- return 1;
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF=%d changes state from %s to %s\n",
+ tbf->tfi, tbf_state_name[tbf->state], tbf_state_name[state]);
+ tbf->state = state;
}
-static void tbf_timer_cb(void *_tbf)
+void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
+ unsigned int seconds, unsigned int microseconds)
{
- struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
-
- tbf->num_T_exp++;
-
- switch (tbf->T) {
- case 1111:
- // TODO: We should add timers for TBF.
- break;
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "Timer expired in unknown mode: %u \n", tbf->T);
- }
-}
+ if (!osmo_timer_pending(&tbf->timer))
+ LOGP(DRLCMAC, LOGL_DEBUG, "Starting TBF=%d timer %u.\n",
+ tbf->tfi, T);
+ else
+ LOGP(DRLCMAC, LOGL_DEBUG, "Restarting TBF=%d timer %u while "
+ "old timer %u pending \n", tbf->tfi, T, tbf->T);
-static void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
- unsigned int seconds)
-{
- if (osmo_timer_pending(&tbf->timer))
- LOGP(DRLCMAC, LOGL_NOTICE, "Starting TBF timer %u while old timer %u pending \n", T, tbf->T);
tbf->T = T;
tbf->num_T_exp = 0;
- /* FIXME: we should do this only once ? */
+ /* Tunning timers can be safely re-scheduled. */
tbf->timer.data = tbf;
tbf->timer.cb = &tbf_timer_cb;
- osmo_timer_schedule(&tbf->timer, seconds, 0);
+ osmo_timer_schedule(&tbf->timer, seconds, microseconds);
}
+void tbf_timer_stop(struct gprs_rlcmac_tbf *tbf)
+{
+ if (osmo_timer_pending(&tbf->timer)) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "Stopping TBF=%d timer %u.\n",
+ tbf->tfi, tbf->T);
+ osmo_timer_del(&tbf->timer);
+ }
+}
+#if 0
static void tbf_gsm_timer_cb(void *_tbf)
{
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
@@ -527,23 +245,12 @@ static void tbf_gsm_timer_cb(void *_tbf)
tbf->num_fT_exp++;
switch (tbf->fT) {
- case 1:
- if (tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))
- {
- // Wait release of UL TBF
- tbf_gsm_timer_start(tbf, 1, 10);
- }
- else
- {
- gprs_rlcmac_downlink_assignment(tbf);
- // FIXME: Remove magic delay!
- int delay = 50;
- tbf_gsm_timer_start(tbf, 2, delay);
- }
- break;
- case 2:
- tbf->state = FINISH_ESTABLISH;
- tbf_dl_data_transfer(tbf);
+ case 0:
+hier alles berdenken
+ // This is timer for delay RLC/MAC data sending after Downlink Immediate Assignment on CCCH.
+ gprs_rlcmac_segment_llc_pdu(tbf);
+ LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
+ tbf_free(tbf);
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "Timer expired in unknown mode: %u \n", tbf->fT);
@@ -565,78 +272,56 @@ static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT,
osmo_gsm_timer_schedule(&tbf->gsm_timer, frames);
}
-static void gprs_rlcmac_enqueue_block(bitvec *block, int len)
+eine stop-funktion, auch im tbf_free aufrufen
+
+#endif
+
+#if 0
+void gprs_rlcmac_enqueue_block(bitvec *block, int len)
{
struct msgb *msg = msgb_alloc(len, "rlcmac_dl");
bitvec_pack(block, msgb_put(msg, len));
msgb_enqueue(&block_queue, msg);
}
+#endif
-void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t tfi, uint16_t arfcn, uint8_t tn, uint8_t ta, uint8_t tsc)
+/* received RLC/MAC block from L1 */
+int gprs_rlcmac_rcv_block(uint8_t *data, uint8_t len, uint32_t fn)
{
- // Packet downlink assignment TS 44.060 11.2.7
-
- int i;
-
- block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
- block->RRBP = 0x0; // N+13
- block->SP = 0x1; // RRBP field is valid
- block->USF = 0x1; // Uplink state flag
-
- block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment
- block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging
-
- block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off
-
- block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on
- block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = 0x0; // UPLINK TFI = on
- block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = tfi-1; // TFI
-
- block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation
- block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode
- block->u.Packet_Downlink_Assignment.CONTROL_ACK = 0x0; // NW establishes no new DL TBF for the MS with running timer T3192
- block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0x80 >> tn; // timeslot(s)
-
- block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on
- block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = ta; // TIMING_ADVANCE_VALUE
- block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off
-
- block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off
-
- block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on
- block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tsc; // Training Sequence Code (TSC)
- block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on
- block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = arfcn; // ARFCN
-
- block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on
- block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tfi; // TFI
-
- block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on
- block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = 0x0; // ALPHA
+ unsigned payload = data[0] >> 6;
+ bitvec *block;
+ int rc = 0;
- for (i = 0; i < 8; i++)
- {
- if (tn == i)
- {
- block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x1; // Slot[i] = on
- block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].GAMMA_TN = 0x0; // GAMMA_TN
- }
- else
- {
- block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x0; // Slot[i] = off
- }
+ switch (payload) {
+ case GPRS_RLCMAC_DATA_BLOCK:
+ rc = gprs_rlcmac_rcv_data_block_acknowledged(data, len);
+ break;
+ case GPRS_RLCMAC_CONTROL_BLOCK:
+ block = bitvec_alloc(len);
+ if (!block)
+ return -ENOMEM;
+ bitvec_unpack(block, data);
+ rc = gprs_rlcmac_rcv_control_block(block, fn);
+ bitvec_free(block);
+ break;
+ case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
+ LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
+ default:
+ LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload.\n");
+ rc = -EINVAL;
}
- block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off
- block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off
- block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
+ return rc;
}
// GSM 04.08 9.1.18 Immediate assignment
-int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint32_t fn,
- uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi, uint32_t tlli)
+int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra,
+ uint32_t fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc,
+ uint8_t tfi, uint8_t usf, uint32_t tlli,
+ uint8_t polling, uint32_t poll_fn)
{
unsigned wp = 0;
+ uint8_t plen;
bitvec_write_field(dest, wp,0x0,4); // Skip Indicator
bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator
@@ -671,6 +356,13 @@ int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint
// A zero-length LV. Just write L=0.
bitvec_write_field(dest, wp,0,8);
+ if ((wp % 8)) {
+ LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest "
+ "octets is not multiple of 8 bits, PLEASE FIX!\n");
+ exit (0);
+ }
+ plen = wp / 8;
+
if (downlink)
{
// GSM 04.08 10.5.2.16 IA Rest Octets
@@ -680,19 +372,27 @@ int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint
bitvec_write_field(dest, wp,0x1,1); // switch TFI : on
bitvec_write_field(dest, wp,tfi,5); // TFI
bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode
- bitvec_write_field(dest, wp,0x0,1); // ALPHA = present
+ bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present
bitvec_write_field(dest, wp,0x0,5); // GAMMA power control parameter
- bitvec_write_field(dest, wp,0x0,1); // Polling Bit
- bitvec_write_field(dest, wp,0x1,1); // TA_VALID ???
+ bitvec_write_field(dest, wp,polling,1); // Polling Bit
+ bitvec_write_field(dest, wp,!polling,1); // TA_VALID ???
bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
bitvec_write_field(dest, wp,0x0,4); // TIMING_ADVANCE_INDEX
- bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present
+ if (polling) {
+ bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present
+ bitvec_write_field(dest, wp,(poll_fn / (26 * 51)) % 32,5); // T1'
+ bitvec_write_field(dest, wp,poll_fn % 51,6); // T3
+ bitvec_write_field(dest, wp,poll_fn % 26,5); // T2
+ } else {
+ bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present
+ }
bitvec_write_field(dest, wp,0x0,1); // P0 not present
- bitvec_write_field(dest, wp,0x1,1); // P0 not present
- bitvec_write_field(dest, wp,0xb,4);
+// bitvec_write_field(dest, wp,0x1,1); // P0 not present
+// bitvec_write_field(dest, wp,0xb,4);
}
else
{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
// GMS 04.08 10.5.2.37b 10.5.2.16
bitvec_write_field(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment
@@ -700,11 +400,11 @@ int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint
bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity
bitvec_write_field(dest, wp, 0, 1); // POLLING
bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic
- bitvec_write_field(dest, wp, 1, 3); // USF
+ bitvec_write_field(dest, wp, usf, 3); // USF
bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY
bitvec_write_field(dest, wp, 0 , 1); // "0" power control: Not Present
- bitvec_write_field(dest, wp, 0, 2); // CHANNEL_CODING_COMMAND
- bitvec_write_field(dest, wp, 0, 1); // TLLI_BLOCK_CHANNEL_CODING
+ bitvec_write_field(dest, wp, bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND
+ bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING
bitvec_write_field(dest, wp, 1 , 1); // "1" Alpha : Present
bitvec_write_field(dest, wp, 0, 4); // Alpha
bitvec_write_field(dest, wp, 0, 5); // Gamma
@@ -712,487 +412,219 @@ int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint
bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG
}
- if (wp%8)
- return wp/8+1;
- else
- return wp/8;
+ return plen;
}
-int write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len)
+/* generate uplink assignment */
+void write_packet_uplink_assignment(bitvec * dest, uint8_t old_tfi,
+ uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, uint8_t new_tfi,
+ uint8_t usf, uint16_t arfcn, uint8_t tn, uint8_t ta, uint8_t tsc,
+ uint8_t poll)
{
+ // TODO We should use our implementation of encode RLC/MAC Control messages.
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
unsigned wp = 0;
-
- bitvec_write_field(dest, wp,0x0,4); // Skip Indicator
- bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator
- bitvec_write_field(dest, wp,0x21,8); // Paging Request Message Type
-
- bitvec_write_field(dest, wp,0x0,4); // Page Mode
- bitvec_write_field(dest, wp,0x0,4); // Channel Needed
-
- // Mobile Identity
- bitvec_write_field(dest, wp,ptmsi_len+1,8); // Mobile Identity length
- bitvec_write_field(dest, wp,0xf,4); // unused
- bitvec_write_field(dest, wp,0x4,4); // PTMSI type
- for (int i = 0; i < ptmsi_len; i++)
- {
- bitvec_write_field(dest, wp,ptmsi[i],8); // PTMSI
- }
- bitvec_write_field(dest, wp,0x0,1); // "L" NLN(PCH) = off
- bitvec_write_field(dest, wp,0x0,1); // "L" Priority1 = off
- bitvec_write_field(dest, wp,0x1,1); // "L" Priority2 = off
- bitvec_write_field(dest, wp,0x0,1); // "L" Group Call information = off
- bitvec_write_field(dest, wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure
- bitvec_write_field(dest, wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure
- bitvec_write_field(dest, wp,0x3,2); // spare padding
- return wp/8;
-}
-
-void write_packet_uplink_ack(RlcMacDownlink_t * block, uint8_t tfi, uint32_t tlli, uint8_t fi, uint8_t bsn)
-{
- // Packet Uplink Ack/Nack TS 44.060 11.2.28
-
int i;
- block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
- block->RRBP = 0x0; // N+13
- block->SP = fi; // RRBP field is valid, if it is final ack
- block->USF = 0x1; // Uplink state flag
+ bitvec_write_field(dest, wp,0x1,2); // Payload Type
+ bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13)
+ bitvec_write_field(dest, wp,poll,1); // Suppl/Polling Bit
+ bitvec_write_field(dest, wp,0x0,3); // Uplink state flag
+ bitvec_write_field(dest, wp,0xa,6); // MESSAGE TYPE
- block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment
- block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging
- block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tfi; // Uplink TFI
+ bitvec_write_field(dest, wp,0x0,2); // Page Mode
- block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = 0x0; // CS1
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = fi; // FINAL ACK INDICATION
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = bsn + 1; // STARTING SEQUENCE NUMBER
- for (i = 0; i < 8; i++)
- {
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i] = 0xff; // RECEIVED BLOCK BITMAP
+ bitvec_write_field(dest, wp,0x0,1); // switch PERSIST_LEVEL: off
+ if (use_tlli) {
+ bitvec_write_field(dest, wp,0x2,2); // switch TLLI : on
+ bitvec_write_field(dest, wp,tlli,32); // TLLI
+ } else {
+ bitvec_write_field(dest, wp,0x0,1); // switch TFI : on
+ bitvec_write_field(dest, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI
+ bitvec_write_field(dest, wp,old_tfi,5); // TFI
}
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
-
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1;
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tlli;
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0;
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0;
- block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0;
-}
+ bitvec_write_field(dest, wp,0x0,1); // Message escape
+ bitvec_write_field(dest, wp, bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND
+ bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING
-void gprs_rlcmac_tx_ul_ack(uint8_t tfi, uint32_t tlli, uint8_t fi, uint8_t bsn)
-{
- bitvec *packet_uplink_ack_vec = bitvec_alloc(23);
- bitvec_unhex(packet_uplink_ack_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- RlcMacDownlink_t * packet_uplink_ack = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
- write_packet_uplink_ack(packet_uplink_ack, tfi, tlli, fi, bsn);
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet Uplink Ack\n", tfi, tlli);
- LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Uplink Ack +++++++++++++++++++++++++\n");
- encode_gsm_rlcmac_downlink(packet_uplink_ack_vec, packet_uplink_ack);
- LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
- LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Uplink Ack -------------------------\n");
- free(packet_uplink_ack);
- gprs_rlcmac_enqueue_block(packet_uplink_ack_vec, 23);
- bitvec_free(packet_uplink_ack_vec);
-}
+ bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on
+ bitvec_write_field(dest, wp,ta,6); // TIMING_ADVANCE_VALUE
+ bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off
-void gprs_rlcmac_data_block_parse(gprs_rlcmac_tbf* tbf, RlcMacUplinkDataBlock_t * ul_data_block)
-{
- // 1. Count the number of octets in header and number of LLC PDU in uplink data block.
- unsigned data_block_hdr_len = 3; // uplink data block header length: 3 mandatory octets
- unsigned llc_pdu_num = 0; // number of LLC PDU in data block
+#if 1
+ bitvec_write_field(dest, wp,0x1,1); // Frequency Parameters information elements = present
+ bitvec_write_field(dest, wp,tsc,3); // Training Sequence Code (TSC)
+ bitvec_write_field(dest, wp,0x0,2); // ARFCN = present
+ bitvec_write_field(dest, wp,arfcn,10); // ARFCN
+#else
+ bitvec_write_field(dest, wp,0x0,1); // Frequency Parameters = off
+#endif
+ bitvec_write_field(dest, wp,0x1,2); // Dynamic Allocation
- if (ul_data_block->E_1 == 0) // Extension octet follows immediately
- {
- unsigned i = -1;
- do
- {
- i++;
- data_block_hdr_len += 1;
- llc_pdu_num++;
-
- // Singular case, TS 44.060 10.4.14
- if (ul_data_block->LENGTH_INDICATOR[i] == 0)
- {
- break;
- }
-
- // New LLC PDU starts after the current LLC PDU and continues until
- // the end of the RLC information field, no more extension octets.
- if ((ul_data_block->M[i] == 1)&&(ul_data_block->E[i] == 1))
- {
- llc_pdu_num++;
- }
- } while(ul_data_block->E[i] == 0); // there is another extension octet, which delimits the new LLC PDU
- }
- else
- {
- llc_pdu_num++;
- }
- if(ul_data_block->TI == 1) // TLLI field is present
- {
- tbf->tlli = ul_data_block->TLLI;
- data_block_hdr_len += 4; // TLLI length : 4 octets
- if (ul_data_block->PI == 1) // PFI is present if TI field indicates presence of TLLI
- {
- data_block_hdr_len += 1; // PFI length : 1 octet
- }
- }
+ bitvec_write_field(dest, wp,0x0,1); // Extended Dynamic Allocation = off
+ bitvec_write_field(dest, wp,0x0,1); // P0 = off
- // 2. Extract all LLC PDU from uplink data block and send them to SGSN.
- unsigned llc_pdu_len = 0;
- unsigned data_octet_num = 0;
+ bitvec_write_field(dest, wp,0x0,1); // USF_GRANULARITY
+ bitvec_write_field(dest, wp,0x1,1); // switch TFI : on
+ bitvec_write_field(dest, wp,new_tfi,5);// TFI
- for (unsigned num = 0; num < llc_pdu_num; num ++)
- {
- if (ul_data_block->E_1 == 0) // Extension octet follows immediately
- {
- // Singular case, TS 44.060 10.4.14
- if (ul_data_block->LENGTH_INDICATOR[num] == 0)
- {
- llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len;
- }
- else
- {
- llc_pdu_len = ul_data_block->LENGTH_INDICATOR[num];
- }
- }
- else
- {
- llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len;
- }
-
- for (unsigned i = tbf->data_index; i < tbf->data_index + llc_pdu_len; i++)
- {
- tbf->rlc_data[i] = ul_data_block->RLC_DATA[data_octet_num];
- data_octet_num++;
- }
- tbf->data_index += llc_pdu_len;
-
- if (ul_data_block->E_1 == 0) // Extension octet follows immediately
- {
- // New LLC PDU starts after the current LLC PDU
- if (ul_data_block->M[num] == 1)
- {
- gprs_rlcmac_tx_ul_ud(tbf);
- tbf->data_index = 0;
- // New LLC PDU continues until the end of the RLC information field, no more extension octets.
- if ((ul_data_block->E[num] == 1))
- {
- llc_pdu_len = UL_RLC_DATA_BLOCK_LEN - data_block_hdr_len - data_octet_num;
- for (unsigned i = tbf->data_index; i < tbf->data_index + llc_pdu_len; i++)
- {
- tbf->rlc_data[i] = ul_data_block->RLC_DATA[data_octet_num];
- data_octet_num++;
- }
- tbf->data_index += llc_pdu_len;
- num++;
- }
- }
- }
- }
-}
-
-/* Received Uplink RLC data block. */
-int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
-{
- struct gprs_rlcmac_tbf *tbf;
- int rc = 0;
-
- LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] Uplink Data Block\n");
- RlcMacUplinkDataBlock_t * ul_data_block = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t));
- LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Data Block +++++++++++++++++++++++++\n");
- decode_gsm_rlcmac_uplink_data(rlc_block, ul_data_block);
- LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Data Block -------------------------\n");
-
- tbf = tbf_by_tfi(ul_data_block->TFI, GPRS_RLCMAC_UL_TBF);
- if (!tbf) {
- return -1;
- }
+ bitvec_write_field(dest, wp,0x0,1); //
+ bitvec_write_field(dest, wp,0x0,1); // TBF Starting Time = off
+ bitvec_write_field(dest, wp,0x0,1); // Timeslot Allocation
- rc = tbf_ul_data_transfer(tbf, ul_data_block);
- free(ul_data_block);
- return rc;
-}
-
-/* Received Uplink RLC control block. */
-int gprs_rlcmac_rcv_control_block(bitvec *rlc_block)
-{
- uint8_t tfi = 0;
- uint32_t tlli = 0;
- struct gprs_rlcmac_tbf *tbf;
- RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
- LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
- decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
- LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
- LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Control Block -------------------------\n");
- switch (ul_control_block->u.MESSAGE_TYPE) {
- case MT_PACKET_CONTROL_ACK:
- tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI;
- tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
- if (!tbf) {
- return 0;
- }
- LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
- tbf_ul_release(tbf);
- break;
- case MT_PACKET_DOWNLINK_ACK_NACK:
- tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
- tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF);
- if (!tbf) {
- return 0;
- }
- LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
- tbf_dl_release(tbf);
- break;
+ for (i = 0; i < 8; i++) {
+ if (tn == i) {
+ bitvec_write_field(dest, wp,0x1,1); // USF_TN(i): on
+ bitvec_write_field(dest, wp,usf,3); // USF_TN(i)
+ } else
+ bitvec_write_field(dest, wp,0x0,1); // USF_TN(i): off
}
- free(ul_control_block);
- return 1;
+// bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present
}
-void gprs_rlcmac_rcv_block(bitvec *rlc_block)
-{
- unsigned readIndex = 0;
- unsigned payload = bitvec_read_field(rlc_block, readIndex, 2);
- switch (payload) {
- case GPRS_RLCMAC_DATA_BLOCK:
- gprs_rlcmac_rcv_data_block(rlc_block);
- break;
- case GPRS_RLCMAC_CONTROL_BLOCK:
- gprs_rlcmac_rcv_control_block(rlc_block);
- break;
- case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
- LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
- default:
- LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload.\n");
- }
-}
-
-struct msgb *gen_dummy_msg(uint8_t usf)
+/* generate downlink assignment */
+void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi,
+ uint8_t old_downlink, uint8_t new_tfi, uint16_t arfcn,
+ uint8_t tn, uint8_t ta, uint8_t tsc, uint8_t poll)
{
- struct msgb *msg = msgb_alloc(23, "rlcmac_dl_idle");
- // RLC/MAC filler with USF=1
- bitvec *filler = bitvec_alloc(23);
-#warning HACK
- if (usf == 1)
- bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- else
- bitvec_unhex(filler, "42942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- bitvec_pack(filler, msgb_put(msg, 23));
- bitvec_free(filler);
- return msg;
-}
+ // Packet downlink assignment TS 44.060 11.2.7
-void gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
- uint32_t fn, uint8_t block_nr)
-{
- struct msgb *msg;
-
- set_current_fn(fn);
- msg = msgb_dequeue(&block_queue);
- if (!msg)
- msg = gen_dummy_msg(block_nr ? 2 : 1);
- pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
-}
+ int i;
-int select_pdch(uint8_t *_trx, uint8_t *_ts)
-{
- uint8_t trx, ts;
+ block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
+ block->RRBP = 0x0; // N+13
+ block->SP = poll; // RRBP field is valid
+ block->USF = 0x0; // Uplink state flag
- for (trx = 0; trx < 8; trx++) {
- for (ts = 0; ts < 8; ts++) {
- if (pcu_l1if_bts.trx[trx].ts[ts].enable) {
- *_trx = trx;
- *_ts = ts;
- return 0;
- }
- }
- }
+ block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment
+ block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging
- return -EBUSY;
-}
+ block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off
-int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta)
-{
- struct gprs_rlcmac_tbf *tbf;
- uint8_t trx, ts;
+ block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on
+ block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI
+ block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI
- static uint8_t prev_ra = 0;
+ block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation
+ block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode
+ block->u.Packet_Downlink_Assignment.CONTROL_ACK = old_downlink; // NW establishes no new DL TBF for the MS with running timer T3192
+ block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0x80 >> tn; // timeslot(s)
- if (prev_ra == ra)
- {
- return -1;
- }
+ block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on
+ block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = ta; // TIMING_ADVANCE_VALUE
+ block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off
- tbf = tbf_alloc(GPRS_RLCMAC_UL_TBF);
+ block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off
- return tbf_ul_establish(tbf, ra, Fn, qta);
-}
+ block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on
+ block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tsc; // Training Sequence Code (TSC)
+ block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on
+ block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = arfcn; // ARFCN
-int gprs_rlcmac_tx_llc_pdus(struct gprs_rlcmac_tbf *tbf)
-{
- int fbi = 0;
- int bsn = 0;
+ block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on
+ block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = new_tfi; // TFI
+ block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on
+ block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = 0x0; // ALPHA
- if (tbf->llc_pdu_list_len == 0)
- {
- return -1;
- }
-
- bitvec *data_block_vector = bitvec_alloc(BLOCK_LEN);
- bitvec_unhex(data_block_vector, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- RlcMacDownlinkDataBlock_t * data_block = (RlcMacDownlinkDataBlock_t *)malloc(sizeof(RlcMacDownlinkDataBlock_t));
-
- struct tbf_llc_pdu *llc_pdu;
-
- int data_block_ready = 0;
- unsigned data_oct_num = 0;
- int llc_pdu_index;
- for (unsigned i = 0; i < tbf->llc_pdu_list_len; i++)
+ for (i = 0; i < 8; i++)
{
- llc_pdu = tbf_llc_pdu_by_num(tbf->llc_pdus, i);
- if (!llc_pdu)
+ if (tn == i)
{
- return -1;
+ block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x1; // Slot[i] = on
+ block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].GAMMA_TN = 0x0; // GAMMA_TN
+ }
+ else
+ {
+ block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[i].Exist = 0x0; // Slot[i] = off
}
+ }
+
+ block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off
+ block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off
+ block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
+}
- llc_pdu_index = 0;
+/* generate uplink ack */
+void write_packet_uplink_ack(RlcMacDownlink_t * block, struct gprs_rlcmac_tbf *tbf,
+ uint8_t final)
+{
+ // Packet Uplink Ack/Nack TS 44.060 11.2.28
- do
+ char show_v_n[65];
+
+ uint8_t rbb = 0;
+ uint16_t i, bbn;
+ uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
+ char bit;
+
+ LOGP(DRLCMACUL, LOGL_DEBUG, "Sending Ack/Nack for TBF=%d "
+ "(final=%d)\n", tbf->tfi, final);
+
+ block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
+ block->RRBP = 0x0; // N+13
+ block->SP = final; // RRBP field is valid, if it is final ack
+ block->USF = 0x0; // Uplink state flag
+
+ block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment
+ block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging
+ block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tbf->tfi; // Uplink TFI
+
+ block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = 0x0; // CS1
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = final; // FINAL ACK INDICATION
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = tbf->dir.ul.v_r; // STARTING_SEQUENCE_NUMBER
+ // RECEIVE_BLOCK_BITMAP
+ for (i = 0, bbn = (tbf->dir.ul.v_r - 64) & mod_sns_half; i < 64;
+ i++, bbn = (bbn + 1) & mod_sns_half) {
+ bit = tbf->dir.ul.v_n[bbn];
+ if (bit == 0)
+ bit = ' ';
+ show_v_n[i] = bit;
+ if (bit == 'R')
+ rbb = (rbb << 1)|1;
+ else
+ rbb = (rbb << 1);
+ if((i%8) == 7)
{
- data_block->PAYLOAD_TYPE = 0;
- data_block->RRBP = 0;
- data_block->SP = 1;
- data_block->USF = 1;
- data_block->PR = 0;
- data_block->TFI = tbf->tfi;
- data_block->BSN = bsn;
-
- // Write LLC PDU to Data Block
- int j;
- for(j = llc_pdu_index; j < llc_pdu->len; j++)
- {
- data_block->RLC_DATA[data_oct_num] = llc_pdu->data[j];
- data_oct_num++;
- llc_pdu_index++;
- // RLC data field is completely filled.
- if (data_oct_num == BLOCK_LEN - 3)
- {
- fbi = 0;
- data_block->E_1 = 1;
- data_block_ready = 1;
- break;
- }
- }
- if(!data_block_ready)
- {
- data_block->E_1 = 0;
- data_block->LENGTH_INDICATOR[0] = data_oct_num;
- if ((i+1) == tbf->llc_pdu_list_len)
- {
- // Current LLC PDU is last in TBF.
- data_block->M[0] = 0;
- data_block->E[0] = 1;
- fbi = 1;
- for(unsigned k = data_oct_num; k < BLOCK_LEN - 4; k++)
- {
- data_block->RLC_DATA[k] = 0x2b;
- }
- data_block_ready = 1;
- }
- else
- {
- // More LLC PDUs should be transmited in this TBF.
- data_block->M[0] = 1;
- data_block->E[0] = 1;
- data_block_ready = 1;
- break;
- }
- }
-
- data_block->FBI = fbi;
-
- if(data_block_ready)
- {
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Downlink Data Block\n");
- LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Downlink Data Block +++++++++++++++++++++++++\n");
- encode_gsm_rlcmac_downlink_data(data_block_vector, data_block);
- LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Downlink Data Block -------------------------\n");
- gprs_rlcmac_enqueue_block(data_block_vector, BLOCK_LEN);
- bitvec_unhex(data_block_vector, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- bsn++;
- data_block_ready = 0;
- data_oct_num = 0;
- }
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i/8] = rbb;
+ rbb = 0;
}
- while(llc_pdu->len != llc_pdu_index);
}
+ show_v_n[64] = '\0';
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received "
+ "N=Not-Received\n", show_v_n);
- return 0;
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
+
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1;
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tbf->tlli;
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0;
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0;
+ block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0;
}
/* Send Uplink unit-data to SGSN. */
-void gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf)
+int gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf)
{
const uint8_t qos_profile = QOS_PROFILE;
struct msgb *llc_pdu;
- unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->data_index;
+ unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->llc_index;
- LOGP(DBSSGP, LOGL_NOTICE, "TX: [PCU -> SGSN ] TFI: %u TLLI: 0x%08x DataLen: %u", tbf->tfi, tbf->tlli, tbf->data_index);
- //LOGP(DBSSGP, LOGL_NOTICE, " Data = ");
- //for (unsigned i = 0; i < tbf->data_index; i++)
- // LOGPC(DBSSGP, LOGL_NOTICE, "%02x ", tbf->rlc_data[i]);
+ LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] TFI: %u TLLI: 0x%08x %s\n", tbf->tfi, tbf->tlli, osmo_hexdump(tbf->llc_frame, tbf->llc_index));
+ if (!bctx) {
+ LOGP(DBSSGP, LOGL_ERROR, "No bctx\n");
+ return -EIO;
+ }
- bctx->cell_id = CELL_ID;
- bctx->nsei = NSEI;
- bctx->ra_id.mnc = MNC;
- bctx->ra_id.mcc = MCC;
- bctx->ra_id.lac = PCU_LAC;
- bctx->ra_id.rac = PCU_RAC;
- bctx->bvci = BVCI;
-
llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu");
- msgb_tvlv_push(llc_pdu, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->data_index, tbf->rlc_data);
+ msgb_tvlv_push(llc_pdu, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->llc_index, tbf->llc_frame);
bssgp_tx_ul_ud(bctx, tbf->tlli, &qos_profile, llc_pdu);
-}
-
-void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf)
-{
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Immidiate Assignment (CCCH)\n", tbf->tfi, tbf->tlli);
- bitvec *immediate_assignment = bitvec_alloc(23);
- bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- int len = write_immediate_assignment(immediate_assignment, 1, 125, get_current_fn(), tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, tbf->tlli);
- pcu_l1if_tx_agch(immediate_assignment, len);
- bitvec_free(immediate_assignment);
-}
-void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf)
-{
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet DL Assignment\n", tbf->tfi, tbf->tlli);
- bitvec *packet_downlink_assignment_vec = bitvec_alloc(23);
- bitvec_unhex(packet_downlink_assignment_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- RlcMacDownlink_t * packet_downlink_assignment = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
- write_packet_downlink_assignment(packet_downlink_assignment, tbf->tfi, tbf->arfcn, tbf->ts, tbf->ta, tbf->tsc);
- LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
- encode_gsm_rlcmac_downlink(packet_downlink_assignment_vec, packet_downlink_assignment);
- LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
- LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
- free(packet_downlink_assignment);
- gprs_rlcmac_enqueue_block(packet_downlink_assignment_vec, 23);
- bitvec_free(packet_downlink_assignment_vec);
-}
-
-void gprs_rlcmac_paging_request(uint8_t *ptmsi, uint16_t ptmsi_len)
-{
- LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Paging Request (CCCH)\n");
- bitvec *paging_request = bitvec_alloc(23);
- bitvec_unhex(paging_request, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
- int len = write_paging_request(paging_request, ptmsi, ptmsi_len);
- pcu_l1if_tx_pch(paging_request, len);
- bitvec_free(paging_request);
+ return 0;
}
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index ed0850b..635a6b1 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -29,24 +29,93 @@ extern "C" {
#include <osmocom/core/timer.h>
}
-#define LLC_MAX_LEN 1543
-#define UL_RLC_DATA_BLOCK_LEN 23
+/* This special feature will delay assignment of downlink TBF by one second,
+ * in case there is already a TBF.
+ * This is usefull to debug downlink establishment during packet idle mode.
+ */
+//#define DEBUG_DL_ASS_IDLE
+
+/*
+ * PDCH instanc
+ */
+
+struct gprs_rlcmac_tbf;
+
+struct gprs_rlcmac_pdch {
+ uint8_t enable; /* TS is enabled */
+ uint8_t tsc; /* TSC of this slot */
+ uint8_t next_ul_tfi; /* next uplink TBF/TFI to schedule (0..31) */
+ uint8_t next_dl_tfi; /* next downlink TBF/TFI to schedule (0..31) */
+ struct gprs_rlcmac_tbf *tbf[32]; /* array of TBF pointers, by TFI */
+ uint32_t last_rts_fn; /* store last frame number of RTS */
+};
+
+struct gprs_rlcmac_trx {
+ uint16_t arfcn;
+ struct gprs_rlcmac_pdch pdch[8];
+};
-enum gprs_rlcmac_tbf_stage {
- TBF_ESTABLISH,
- TBF_DATA_TRANSFER,
- TBF_RELEASE
+struct gprs_rlcmac_bts {
+ uint8_t cs1;
+ uint8_t cs2;
+ uint8_t cs3;
+ uint8_t cs4;
+ uint8_t initial_cs;
+ uint8_t t3142;
+ uint8_t t3169;
+ uint8_t t3191;
+ uint16_t t3193_msec;
+ uint8_t t3195;
+ uint8_t n3101;
+ uint8_t n3103;
+ uint8_t n3105;
+ struct gprs_rlcmac_trx trx[8];
};
+extern struct gprs_rlcmac_bts *gprs_rlcmac_bts;
+
+/*
+ * TBF instance
+ */
+
+#define LLC_MAX_LEN 1543
+#define RLC_MAX_SNS 128 /* GPRS, must be power of 2 */
+#define RLC_MAX_WS 64 /* max window size */
+#define RLC_MAX_LEN 54 /* CS-4 including spare bits */
+
+#define Tassign_agch 0,500000/* wait for assignment, before transmitting DL */
+#define Tassign_pacch 0,100000/* wait for assignment, before transmitting DL */
+
enum gprs_rlcmac_tbf_state {
- WAIT_ESTABLISH,
- CCCH_ESTABLISH,
- PACCH_ESTABLISH,
- FINISH_ESTABLISH,
- WAIT_DATA_TRANSFER,
- DATA_TRANSFER,
- FINISH_DATA_TRANSFER,
- RELEASE
+ GPRS_RLCMAC_NULL = 0, /* new created TBF */
+ GPRS_RLCMAC_ASSIGN, /* wait for downlink assignment */
+ GPRS_RLCMAC_FLOW, /* RLC/MAC flow, ressource needed */
+ GPRS_RLCMAC_FINISHED, /* flow finished, wait for release */
+ GPRS_RLCMAC_WAIT_RELEASE,/* wait for release or restart of DL TBF */
+ GPRS_RLCMAC_RELEASING, /* releasing, wait to free TBI/USF */
+};
+
+enum gprs_rlcmac_tbf_poll_state {
+ GPRS_RLCMAC_POLL_NONE = 0,
+ GPRS_RLCMAC_POLL_SCHED, /* a polling was scheduled */
+};
+
+enum gprs_rlcmac_tbf_dl_ass_state {
+ GPRS_RLCMAC_DL_ASS_NONE = 0,
+ GPRS_RLCMAC_DL_ASS_SEND_ASS, /* send downlink assignment on next RTS */
+ GPRS_RLCMAC_DL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
+};
+
+enum gprs_rlcmac_tbf_ul_ass_state {
+ GPRS_RLCMAC_UL_ASS_NONE = 0,
+ GPRS_RLCMAC_UL_ASS_SEND_ASS, /* send uplink assignment on next RTS */
+ GPRS_RLCMAC_UL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
+};
+
+enum gprs_rlcmac_tbf_ul_ack_state {
+ GPRS_RLCMAC_UL_ACK_NONE = 0,
+ GPRS_RLCMAC_UL_ACK_SEND_ACK, /* send acknowledge on next RTS */
+ GPRS_RLCMAC_UL_ACK_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};
enum gprs_rlcmac_tbf_direction {
@@ -54,30 +123,57 @@ enum gprs_rlcmac_tbf_direction {
GPRS_RLCMAC_UL_TBF
};
-struct tbf_llc_pdu {
- struct llist_head list;
- uint8_t num;
- uint8_t data[LLC_MAX_LEN];
- uint16_t len;
-};
-
struct gprs_rlcmac_tbf {
struct llist_head list;
enum gprs_rlcmac_tbf_state state;
- enum gprs_rlcmac_tbf_stage stage;
enum gprs_rlcmac_tbf_direction direction;
- struct gprs_rlcmac_tbf *next_tbf;
uint8_t tfi;
uint32_t tlli;
-
- struct llist_head llc_pdus;
- struct tbf_llc_pdu llc_pdu;
- uint8_t llc_pdu_list_len;
- uint8_t rlc_data[LLC_MAX_LEN];
- uint16_t data_index;
- uint8_t bsn;
+ uint8_t tlli_valid;
uint8_t trx, ts, tsc;
+ struct gprs_rlcmac_pdch *pdch;
uint16_t arfcn, ta;
+ uint8_t llc_frame[LLC_MAX_LEN]; /* current DL or UL frame */
+ uint16_t llc_index; /* current write/read position of frame */
+ uint16_t llc_length; /* len of current DL LLC_frame, 0 == no frame */
+ llist_head llc_queue; /* queued LLC DL data */
+
+ enum gprs_rlcmac_tbf_dl_ass_state dl_ass_state;
+ enum gprs_rlcmac_tbf_ul_ass_state ul_ass_state;
+ enum gprs_rlcmac_tbf_ul_ack_state ul_ack_state;
+
+ enum gprs_rlcmac_tbf_poll_state poll_state;
+ uint32_t poll_fn;
+
+ uint16_t ws; /* window size */
+ uint16_t sns; /* sequence number space */
+
+ /* Please note that all variables here will be reset when changing
+ * from WAIT RELEASE back to FLOW state (re-use of TBF).
+ * All states that need reset must be in this struct, so this is why
+ * variables are in both (dl and ul) structs and not outside union.
+ */
+ union {
+ struct {
+ uint16_t bsn; /* block sequence number */
+ uint16_t v_s; /* send state */
+ uint16_t v_a; /* ack state */
+ char v_b[RLC_MAX_SNS/2]; /* acknowledge state array */
+ int32_t tx_counter; /* count all transmitted blocks */
+ uint8_t n3105; /* N3105 counter */
+ } dl;
+ struct {
+ uint16_t bsn; /* block sequence number */
+ uint16_t v_r; /* receive state */
+ uint16_t v_q; /* receive window state */
+ char v_n[RLC_MAX_SNS/2]; /* receive state array */
+ int32_t rx_counter; /* count all received blocks */
+ uint8_t n3103; /* N3103 counter */
+ uint8_t usf; /* USF */
+ } ul;
+ } dir;
+ uint8_t rlc_block[RLC_MAX_SNS/2][RLC_MAX_LEN]; /* block history */
+ uint8_t rlc_block_len[RLC_MAX_SNS/2]; /* block len of history */
struct osmo_timer_list timer;
unsigned int T; /* Txxxx number */
@@ -88,72 +184,88 @@ struct gprs_rlcmac_tbf {
unsigned int num_fT_exp; /* number of consecutive fT expirations */
};
-/* TS 44.060 Section 10.4.7 Table 10.4.7.1: Payload Type field */
-enum gprs_rlcmac_block_type {
- GPRS_RLCMAC_DATA_BLOCK = 0x0,
- GPRS_RLCMAC_CONTROL_BLOCK = 0x1,
- GPRS_RLCMAC_CONTROL_BLOCK_OPT = 0x2,
- GPRS_RLCMAC_RESERVED = 0x3
-};
-
extern struct llist_head gprs_rlcmac_tbfs;
-int select_pdch(uint8_t *_trx, uint8_t *_ts);
+int tfi_alloc(uint8_t *_trx, uint8_t *_ts);
-int tfi_alloc();
+struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi, uint8_t trx, uint8_t ts);
-static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, gprs_rlcmac_tbf_direction dir);
+struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, int direction);
-static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, gprs_rlcmac_tbf_direction dir);
+struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, int direction);
-static void tbf_free(struct gprs_rlcmac_tbf *tbf);
+struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn);
-static struct tbf_llc_pdu *tbf_llc_pdu_by_num(struct llist_head llc_pdus, uint8_t num);
+int find_free_usf(uint8_t trx, uint8_t ts);
-int tbf_add_llc_pdu(struct gprs_rlcmac_tbf *tbf, uint8_t *data, uint16_t llc_pdu_len);
+void tbf_free(struct gprs_rlcmac_tbf *tbf);
-struct gprs_rlcmac_tbf *tbf_alloc(gprs_rlcmac_tbf_direction dir, uint32_t tlli = 0);
+void tbf_new_state(struct gprs_rlcmac_tbf *tbf,
+ enum gprs_rlcmac_tbf_state state);
-int tbf_ul_establish(struct gprs_rlcmac_tbf *tbf, uint8_t ra, uint32_t Fn, uint16_t qta);
+void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
+ unsigned int seconds, unsigned int microseconds);
-int tbf_dl_establish(struct gprs_rlcmac_tbf *tbf);
+void tbf_timer_stop(struct gprs_rlcmac_tbf *tbf);
-int tbf_ul_data_transfer(struct gprs_rlcmac_tbf *tbf, RlcMacUplinkDataBlock_t * ul_data_block);
+/* TS 44.060 Section 10.4.7 Table 10.4.7.1: Payload Type field */
+enum gprs_rlcmac_block_type {
+ GPRS_RLCMAC_DATA_BLOCK = 0x0,
+ GPRS_RLCMAC_CONTROL_BLOCK = 0x1,
+ GPRS_RLCMAC_CONTROL_BLOCK_OPT = 0x2,
+ GPRS_RLCMAC_RESERVED = 0x3
+};
-int tbf_dl_data_transfer(struct gprs_rlcmac_tbf *tbf, uint8_t *llc_pdu = NULL, uint16_t llc_pdu_len = 0);
+int gprs_rlcmac_rcv_block(uint8_t *data, uint8_t len, uint32_t fn);
-int tbf_ul_release(struct gprs_rlcmac_tbf *tbf);
+int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra,
+ uint32_t fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc,
+ uint8_t tfi, uint8_t usf, uint32_t tlli, uint8_t polling,
+ uint32_t poll_fn);
-int tbf_dl_release(struct gprs_rlcmac_tbf *tbf);
+void write_packet_uplink_assignment(bitvec * dest, uint8_t old_tfi,
+ uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, uint8_t new_tfi,
+ uint8_t usf, uint16_t arfcn, uint8_t tn, uint8_t ta, uint8_t tsc,
+ uint8_t poll);
-static void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, unsigned int seconds);
+void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi,
+ uint8_t old_downlink, uint8_t new_tfi, uint16_t arfcn,
+ uint8_t tn, uint8_t ta, uint8_t tsc, uint8_t poll);
-static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT, int frames);
+void write_packet_uplink_ack(RlcMacDownlink_t * block, struct gprs_rlcmac_tbf *tbf,
+ uint8_t final);
-int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint32_t fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi, uint32_t tlli = 0);
+int gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf);
-void gprs_rlcmac_tx_ul_ack(uint8_t tfi, uint32_t tlli, uint8_t ti, uint8_t bsn);
+void tbf_timer_cb(void *_tbf);
-void gprs_rlcmac_data_block_parse(gprs_rlcmac_tbf* tbf, RlcMacUplinkDataBlock_t * ul_data_block);
+int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf);
-int gprs_rlcmac_rcv_data_block(bitvec *rlc_block);
+int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta);
-int gprs_rlcmac_rcv_control_block(bitvec *rlc_block);
+int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn);
-void gprs_rlcmac_rcv_block(bitvec *rlc_block);
+struct msgb *gprs_rlcmac_send_packet_uplink_assignment(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn);
-void gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
- uint32_t fn, uint8_t block_nr);
+struct msgb *gprs_rlcmac_send_packet_downlink_assignment(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn);
-int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta);
+void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf,
+ uint8_t old_downlink, char *imsi);
-int gprs_rlcmac_tx_llc_pdus(struct gprs_rlcmac_tbf *tbf);
+int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final,
+ uint8_t ssn, uint8_t *rbb);
-void gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf);
+int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len);
-void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf);
+struct msgb *gprs_rlcmac_send_data_block_acknowledged(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn);
-void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf);
+struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf,
+ uint32_t fn);
+
+int gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
+ uint32_t fn, uint8_t block_nr);
-void gprs_rlcmac_paging_request(uint8_t *ptmsi, uint16_t ptmsi_len);
#endif // GPRS_RLCMAC_H
diff --git a/src/gprs_rlcmac_data.cpp b/src/gprs_rlcmac_data.cpp
new file mode 100644
index 0000000..7beca38
--- /dev/null
+++ b/src/gprs_rlcmac_data.cpp
@@ -0,0 +1,1409 @@
+/* Data block transfer
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <gprs_bssgp_pcu.h>
+#include <gprs_rlcmac.h>
+#include <pcu_l1_if.h>
+
+/* After receiving these framess, we send ack/nack. */
+#define ACK_AFTER_FRAMES 20
+
+/* If acknowledgement to uplink/downlin assignmentshould be polled */
+#define POLLING_ASSIGNMENT 0
+
+extern "C" {
+/* TS 04.60 10.2.2 */
+struct rlc_ul_header {
+ uint8_t r:1,
+ si:1,
+ cv:4,
+ pt:2;
+ uint8_t ti:1,
+ tfi:5,
+ pi:1,
+ spare:1;
+ uint8_t e:1,
+ bsn:7;
+} __attribute__ ((packed));
+
+struct rlc_dl_header {
+ uint8_t usf:3,
+ s_p:1,
+ rrbp:2,
+ pt:2;
+ uint8_t fbi:1,
+ tfi:5,
+ pr:2;
+ uint8_t e:1,
+ bsn:7;
+} __attribute__ ((packed));
+
+struct rlc_li_field {
+ uint8_t e:1,
+ m:1,
+ li:6;
+} __attribute__ ((packed));
+}
+
+int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf)
+{
+ LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for TBF=%d\n", tbf->tfi);
+
+ tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
+
+ if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET "
+ "CONTROL ACK for PACKET UPLINK ACK\n");
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
+ if (tbf->state == GPRS_RLCMAC_FINISHED) {
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+ tbf->dir.ul.n3103++;
+ if (tbf->dir.ul.n3103 == bts->n3103) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- N3103 exceeded\n");
+ tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
+ tbf_timer_start(tbf, 3169, bts->t3169, 0);
+ return 0;
+ }
+ /* reschedule UL ack */
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK;
+ }
+ } else
+ if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET "
+ "CONTROL ACK for PACKET UPLINK ASSIGNMENT.\n");
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
+ } else
+ if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET "
+ "CONTROL ACK for PACKET DOWNLINK ASSIGNMENT.\n");
+ tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
+ /* in case out downlink assigment failed: */
+ if (tbf->state == GPRS_RLCMAC_ASSIGN) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- Assignment failed\n");
+ tbf_free(tbf);
+ }
+ } else
+ if (tbf->direction == GPRS_RLCMAC_DL_TBF)
+ {
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+ LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET "
+ " DOWNLINK ACK.\n");
+ tbf->dir.dl.n3105++;
+ if (tbf->dir.dl.n3105 == bts->n3105) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "- N3105 exceeded\n");
+ tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
+ tbf_timer_start(tbf, 3195, bts->t3195, 0);
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+/* Received Uplink RLC control block. */
+int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn)
+{
+ uint8_t tfi = 0;
+ uint32_t tlli = 0;
+ struct gprs_rlcmac_tbf *tbf;
+
+ RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
+ LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
+ decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
+ LOGPC(DCSN1, LOGL_NOTICE, "\n");
+ LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
+ switch (ul_control_block->u.MESSAGE_TYPE) {
+ case MT_PACKET_CONTROL_ACK:
+ tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI;
+ tbf = tbf_by_poll_fn(fn);
+ if (!tbf) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
+ "unknown FN=%u TLL=0x%08x\n", fn, tlli);
+ break;
+ }
+ tfi = tbf->tfi;
+ if (tlli != tbf->tlli) {
+ LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to "
+ "0x%08x\n", tlli);
+ tbf->tlli = tlli;
+ }
+ LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
+ tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
+
+ /* check if this control ack belongs to packet uplink ack */
+ if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
+ tbf_free(tbf);
+ break;
+ }
+ if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
+ tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
+ break;
+ }
+ if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
+ break;
+ }
+ LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
+ "at no request\n");
+ break;
+ case MT_PACKET_DOWNLINK_ACK_NACK:
+ tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
+ tbf = tbf_by_poll_fn(fn);
+ if (!tbf) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
+ "unknown FN=%u TBF=%d\n", fn, tfi);
+ break;
+ }
+ /* reset N3105 */
+ tbf->dir.dl.n3105 = 0;
+ /* stop timer T3191 */
+ tbf_timer_stop(tbf);
+ tlli = tbf->tlli;
+ LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
+ tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
+
+ gprs_rlcmac_downlink_ack(tbf,
+ ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION,
+ ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
+ ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP);
+ /* check for channel request */
+ if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) {
+ uint8_t trx, ts, usf;
+ struct gprs_rlcmac_tbf *ul_tbf;
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+ LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
+ "message, so we provide one:\n");
+uplink_request:
+ /* create new tbf */
+ tfi = tfi_alloc(&trx, &ts);
+ if (tfi < 0) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
+ /* FIXME: send reject */
+ break;
+ }
+ usf = find_free_usf(trx, ts);
+ if (usf < 0) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n");
+ /* FIXME: send reject */
+ break;
+ }
+ ul_tbf = tbf_alloc(tfi, trx, ts);
+ ul_tbf->tlli = tbf->tlli;
+ ul_tbf->tlli_valid = 1; /* no content resolution */
+ ul_tbf->ta = tbf->ta; /* use current TA */
+ ul_tbf->direction = GPRS_RLCMAC_UL_TBF;
+ ul_tbf->dir.ul.usf = usf;
+ tbf_new_state(ul_tbf, GPRS_RLCMAC_FLOW);
+ tbf_timer_start(ul_tbf, 3169, bts->t3169, 0);
+ /* schedule uplink assignment */
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
+ }
+ break;
+ case MT_PACKET_RESOURCE_REQUEST:
+ if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) {
+ tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI;
+ tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
+ if (!tbf) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli);
+ break;
+ }
+ tfi = tbf->tfi;
+ } else {
+ if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) {
+ tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI;
+ tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF);
+ if (!tbf) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli);
+ break;
+ }
+ } else {
+ tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI;
+ tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF);
+ if (!tbf) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli);
+ break;
+ }
+ }
+ tlli = tbf->tlli;
+ }
+ LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet ressource request\n", tbf->tfi, tbf->tlli);
+#warning FIXME
+puts("FIXME: UL request during UL request"); exit(0);
+
+
+ break;
+ default:
+ LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n");
+ }
+ free(ul_control_block);
+ return 1;
+}
+
+#ifdef DEBUG_DL_ASS_IDLE
+ char debug_imsi[16];
+#endif
+
+void tbf_timer_cb(void *_tbf)
+{
+ struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
+
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF=%d timer %u expired.\n", tbf->tfi,
+ tbf->T);
+
+ tbf->num_T_exp++;
+
+ switch (tbf->T) {
+#ifdef DEBUG_DL_ASS_IDLE
+ case 1234:
+ gprs_rlcmac_trigger_downlink_assignment(tbf, 0, debug_imsi);
+ break;
+#endif
+ case 0: /* assignment */
+ /* change state to FLOW, so scheduler will start transmission */
+ if (tbf->state == GPRS_RLCMAC_ASSIGN)
+ tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
+ else
+ LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign "
+ "state\n");
+ break;
+ case 3169:
+ case 3191:
+ case 3195:
+ LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during "
+ "transsmission\n", tbf->T);
+ /* fall through */
+ case 3193:
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n");
+ /* free TBF */
+ tbf_free(tbf);
+ break;
+ default:
+ LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n",
+ tbf->T);
+ }
+}
+
+/*
+ * UL data block flow
+ */
+
+/* get TLLI from received UL data block */
+static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli)
+{
+ struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
+ struct rlc_li_field *li;
+ uint8_t e;
+
+ if (!rh->ti)
+ return -EINVAL;
+
+ data += 3;
+ len -= 3;
+ e = rh->e;
+ /* if E is not set (LI follows) */
+ while (!e) {
+ if (!len) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, "
+ "but no more data\n");
+ return -EINVAL;
+ }
+ /* get new E */
+ li = (struct rlc_li_field *)data;
+ if (li->e == 0) /* if LI==0, E is interpreted as '1' */
+ e = 1;
+ else
+ e = li->e;
+ data++;
+ len--;
+ }
+ if (len < 4) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame "
+ "border\n");
+ return -EINVAL;
+ }
+ *tlli = ntohl(*((uint32_t *)data));
+
+ return 0;
+}
+
+/* Store received block data in LLC message(s) and forward to SGSN if complete.
+ */
+static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data,
+ uint8_t len)
+{
+ struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
+ uint8_t e, m;
+ struct rlc_li_field *li;
+ uint8_t frame_offset[16], offset = 0, chunk;
+ int i, frames = 0;
+
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len);
+
+ data += 3;
+ len -= 3;
+ e = rh->e; /* if extended */
+ m = 1; /* more frames, that means: the first frame */
+
+ /* Parse frame offsets from length indicator(s), if any. */
+ while (1) {
+ if (frames == (int)sizeof(frame_offset)) {
+ LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in "
+ "block\n");
+ return -EINVAL;
+ }
+ frame_offset[frames++] = offset;
+ LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset "
+ "%d\n", frames, offset);
+ if (!len)
+ break;
+ /* M == 0 and E == 0 is not allowed in this version. */
+ if (!m && !e) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d "
+ "ignored, because M='0' and E='0'.\n",
+ tbf->tfi);
+ return 0;
+ }
+ /* no more frames in this segment */
+ if (e) {
+ break;
+ }
+ /* There is a new frame and an LI that delimits it. */
+ if (m) {
+ li = (struct rlc_li_field *)data;
+ LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n",
+ li->li);
+ /* Special case: LI == 0
+ * If the last segment would fit precisely into the
+ * rest of the RLC MAC block, there would be no way
+ * to delimit that this segment ends and is not
+ * continued in the next block.
+ * The special LI (0) is used to force the segment to
+ * extend into the next block, so it is delimited there.
+ * This LI must be skipped. Also it is the last LI.
+ */
+ if (li->li == 0) {
+ data++;
+ len--;
+ m = 1; /* M is ignored, we know there is more */
+ break; /* handle E as '1', so we break! */
+ }
+ e = li->e;
+ m = li->m;
+ offset += li->li;
+ data++;
+ len--;
+ continue;
+ }
+ }
+ if (!m) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare "
+ "data\n");
+ }
+
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n",
+ len);
+ /* TLLI */
+ if (rh->ti) {
+ if (len < 4) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of "
+ "frame border\n");
+ return -EINVAL;
+ }
+ data += 4;
+ len -= 4;
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: "
+ "%d\n", len);
+ }
+
+ /* PFI */
+ if (rh->pi) {
+ LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, "
+ "please disable in SYSTEM INFORMATION\n");
+ if (len < 1) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of "
+ "frame border\n");
+ return -EINVAL;
+ }
+ data++;
+ len--;
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: "
+ "%d\n", len);
+ }
+
+ /* Now we have:
+ * - a list of frames offsets: frame_offset[]
+ * - number of frames: i
+ * - m == 0: Last frame carries spare data (end of TBF).
+ */
+
+ /* Check if last offset would exceed frame. */
+ if (offset > len) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, "
+ "because LI delimits data that exceeds block size.\n",
+ tbf->tfi);
+ return -EINVAL;
+ }
+
+ /* create LLC frames */
+ for (i = 0; i < frames; i++) {
+ /* last frame ? */
+ if (i == frames - 1) {
+ /* no more data in last frame */
+ if (!m)
+ break;
+ /* data until end of frame */
+ chunk = len - frame_offset[i];
+ } else {
+ /* data until next frame */
+ chunk = frame_offset[i + 1] - frame_offset[i];
+ }
+ LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to "
+ "frame at %d.\n", chunk, tbf->llc_index);
+ if (tbf->llc_index + chunk > LLC_MAX_LEN) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds "
+ "maximum size.\n");
+ chunk = LLC_MAX_LEN - tbf->llc_index;
+ }
+ memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i],
+ chunk);
+ tbf->llc_index += chunk;
+ /* not last frame. */
+ if (i != frames - 1) {
+ /* send frame to SGSN */
+ LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
+ "TBF=%d: %s\n", tbf->tfi,
+ osmo_hexdump(tbf->llc_frame, tbf->llc_index));
+ gprs_rlcmac_tx_ul_ud(tbf);
+ tbf->llc_index = 0; /* reset frame space */
+ /* also check if CV==0, because the frame may fill up the
+ * block precisely, then it is also complete. normally the
+ * frame would be extended into the next block with a 0-length
+ * delimiter added to this block. */
+ } else if (rh->cv == 0) {
+ /* send frame to SGSN */
+ LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
+ "TBF=%d that fits precisely in last block: "
+ "%s\n", tbf->tfi,
+ osmo_hexdump(tbf->llc_frame, tbf->llc_index));
+ gprs_rlcmac_tx_ul_ud(tbf);
+ tbf->llc_index = 0; /* reset frame space */
+ }
+ }
+
+ return 0;
+}
+
+struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf,
+ uint32_t fn)
+{
+ int final = (tbf->state == GPRS_RLCMAC_FINISHED);
+ struct msgb *msg;
+
+ if (final && tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
+ "sheduled for TBF=%d, so we must wait for final uplink "
+ "ack...\n", tbf->tfi);
+ return NULL;
+ }
+
+ msg = msgb_alloc(23, "rlcmac_ul_ack");
+ if (!msg)
+ return NULL;
+ bitvec *ack_vec = bitvec_alloc(23);
+ if (!ack_vec) {
+ msgb_free(msg);
+ return NULL;
+ }
+ bitvec_unhex(ack_vec,
+ "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
+ RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
+ write_packet_uplink_ack(mac_control_block, tbf, final);
+ encode_gsm_rlcmac_downlink(ack_vec, mac_control_block);
+ bitvec_pack(ack_vec, msgb_put(msg, 23));
+ bitvec_free(ack_vec);
+ free(mac_control_block);
+
+ if (final) {
+ tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
+ tbf->poll_fn = (fn + 13) % 2715648;
+ /* waiting for final acknowledge */
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK;
+ } else
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
+
+ return msg;
+}
+
+/* receive UL data block
+ *
+ * The blocks are defragmented and forwarded as LLC frames, if complete.
+ */
+int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len)
+{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_tbf *tbf;
+ struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
+ uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index;
+ int rc;
+
+ switch (len) {
+ case 54:
+ /* omitting spare bits */
+ len = 53;
+ break;
+ case 40:
+ /* omitting spare bits */
+ len = 39;
+ break;
+ case 34:
+ /* omitting spare bits */
+ len = 33;
+ break;
+ case 23:
+ break;
+ default:
+ LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
+ "length: %d)\n", len);
+ return -EINVAL;
+ }
+
+ /* find TBF inst from given TFI */
+ tbf = tbf_by_tfi(rh->tfi, GPRS_RLCMAC_UL_TBF);
+ if (!tbf) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n",
+ rh->tfi);
+ return 0;
+ }
+
+ if (tbf->direction != GPRS_RLCMAC_UL_TBF) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d not Uplink "
+ "tbf\n", rh->tfi);
+ return 0;
+ }
+
+ LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. "
+ "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r);
+
+ /* get TLLI */
+ if (!tbf->tlli_valid) {
+ /* no TLLI yet */
+ if (!rh->ti) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without "
+ "TLLI, but no TLLI received yet\n", rh->tfi);
+ return 0;
+ }
+ rc = tlli_from_ul_data(data, len, &tbf->tlli);
+ if (rc) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
+ "of UL DATA TBF=%d.\n", rh->tfi);
+ return 0;
+ }
+ tbf->tlli_valid = 1;
+ LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of "
+ "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi);
+ /* already have TLLI, but we stille get another one */
+ } else if (rh->ti) {
+ uint32_t tlli;
+ rc = tlli_from_ul_data(data, len, &tlli);
+ if (rc) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
+ "of UL DATA TBF=%d.\n", rh->tfi);
+ return 0;
+ }
+ if (tlli != tbf->tlli) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL "
+ "DATA TBF=%d. (Ignoring due to contention "
+ "resolution)\n", rh->tfi);
+ return 0;
+ }
+ }
+
+ mod_sns = tbf->sns - 1;
+ mod_sns_half = (tbf->sns >> 1) - 1;
+
+ /* restart T3169 */
+ tbf_timer_start(tbf, 3169, bts->t3169, 0);
+
+ /* Increment RX-counter */
+ tbf->dir.ul.rx_counter++;
+
+ /* current block relative to lowest unreceived block */
+ offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns;
+ /* If out of window (may happen if blocks below V(Q) are received
+ * again. */
+ if (offset_v_q >= tbf->ws) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window "
+ "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q,
+ (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
+ return 0;
+ }
+ /* Write block to buffer and set receive state array. */
+ index = rh->bsn & mod_sns_half; /* memory index of block */
+ memcpy(tbf->rlc_block[index], data, len); /* Copy block. */
+ tbf->rlc_block_len[index] = len;
+ tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n",
+ rh->bsn, tbf->dir.ul.v_q,
+ (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
+ /* Raise V(R) to highest received sequence number not received. */
+ offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns;
+ if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */
+ while (offset_v_r--) {
+ if (offset_v_r) /* all except the received block */
+ tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half]
+ = 'N'; /* Mark block as not received */
+ tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns;
+ /* Inc V(R). */
+ }
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n",
+ tbf->dir.ul.v_r);
+ }
+
+ /* Raise V(Q) if possible, and retrieve LLC frames from blocks.
+ * This is looped until there is a gap (non received block) or
+ * the window is empty.*/
+ while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[
+ (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising "
+ "V(Q) to %d\n", tbf->dir.ul.v_q,
+ (tbf->dir.ul.v_q + 1) & mod_sns);
+ /* get LLC data from block */
+ gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index],
+ tbf->rlc_block_len[index]);
+ /* raise V(Q), because block already received */
+ tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns;
+ }
+
+ /* Check CV of last frame in buffer */
+ if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */
+ && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */
+ struct rlc_ul_header *last_rh = (struct rlc_ul_header *)
+ tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half];
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, "
+ "last block: BSN=%d CV=%d\n", last_rh->bsn,
+ last_rh->cv);
+ if (last_rh->cv == 0) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL "
+ "TBF\n");
+ tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
+ /* Reset N3103 counter. */
+ tbf->dir.ul.n3103 = 0;
+ }
+ }
+
+ /* If TLLI is included or if we received half of the window, we send
+ * an ack/nack */
+ if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED
+ || (tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) {
+ if (rh->si) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
+ "because MS is stalled.\n");
+ }
+ if (rh->ti) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
+ "because TLLI is included.\n");
+ }
+ if (tbf->state == GPRS_RLCMAC_FINISHED) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
+ "because last block has CV==0.\n");
+ }
+ if ((tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
+ "because %d frames received.\n",
+ ACK_AFTER_FRAMES);
+ }
+ if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) {
+ /* trigger sending at next RTS */
+ tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK;
+ } else {
+ /* already triggered */
+ LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is "
+ "already triggered, don't schedule!\n");
+ }
+ }
+
+ return 0;
+}
+
+struct msgb *gprs_rlcmac_send_packet_uplink_assignment(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn)
+{
+ struct msgb *msg;
+ struct gprs_rlcmac_tbf *new_tbf;
+
+ if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
+ LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
+ "sheduled for TBF=%d, so we must wait for uplink "
+ "assignment...\n", tbf->tfi);
+ return NULL;
+ }
+
+ /* on down TBF we get the uplink TBF to be assigned. */
+ if (tbf->direction == GPRS_RLCMAC_DL_TBF)
+ new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF);
+ else
+ new_tbf = tbf;
+
+ if (!new_tbf) {
+ LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink "
+ "assignment at downlink TBF=%d, but there is no uplink "
+ "TBF\n", tbf->tfi);
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
+ return NULL;
+ }
+
+ msg = msgb_alloc(23, "rlcmac_ul_ass");
+ if (!msg)
+ return NULL;
+ LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Uplink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli);
+ bitvec *ass_vec = bitvec_alloc(23);
+ if (!ass_vec) {
+ msgb_free(msg);
+ return NULL;
+ }
+ bitvec_unhex(ass_vec,
+ "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
+ write_packet_uplink_assignment(ass_vec, tbf->tfi,
+ (tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf->tfi,
+ new_tbf->dir.ul.usf, new_tbf->arfcn, new_tbf->ts, new_tbf->ta,
+ new_tbf->tsc, POLLING_ASSIGNMENT);
+ bitvec_pack(ass_vec, msgb_put(msg, 23));
+ RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
+ LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n");
+ decode_gsm_rlcmac_downlink(ass_vec, mac_control_block);
+ LOGPC(DCSN1, LOGL_NOTICE, "\n");
+ LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n");
+ bitvec_free(ass_vec);
+
+#if POLLING_ASSIGNMENT == 1
+ FIXME process does not work, also the acknowledgement is not checked.
+ tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
+ tbf->poll_fn = (fn + 13) % 2715648;
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK;
+#else
+ tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
+#endif
+
+ return msg;
+}
+
+int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta)
+{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_tbf *tbf;
+ uint8_t trx, ts;
+ int tfi, usf; /* must be signed */
+
+ LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide "
+ "one:\n");
+ // Create new TBF
+ tfi = tfi_alloc(&trx, &ts);
+ if (tfi < 0) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
+ /* FIXME: send reject */
+ return -EBUSY;
+ }
+ usf = find_free_usf(trx, ts);
+ if (usf < 0) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n");
+ /* FIXME: send reject */
+ return -EBUSY;
+ }
+ tbf = tbf_alloc(tfi, trx, ts);
+ if (qta < 0)
+ qta = 0;
+ if (qta > 252)
+ qta = 252;
+ tbf->ta = qta >> 2;
+ tbf->direction = GPRS_RLCMAC_UL_TBF;
+ tbf->dir.ul.usf = usf;
+ tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
+ tbf_timer_start(tbf, 3169, bts->t3169, 0);
+ LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi);
+ LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n", tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
+ LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate Assignment Uplink (AGCH)\n", tbf->tfi);
+ bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */;
+ bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
+ int plen = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, usf, 0, 0, 0);
+ pcu_l1if_tx_agch(immediate_assignment, plen);
+ bitvec_free(immediate_assignment);
+
+ return 0;
+}
+
+
+/*
+ * DL data block flow
+ */
+
+/* send DL data block
+ *
+ * The messages are fragmented and forwarded as data blocks.
+ */
+struct msgb *gprs_rlcmac_send_data_block_acknowledged(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn)
+{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct rlc_dl_header *rh;
+ struct rlc_li_field *li;
+ uint8_t block_length; /* total length of block, including spare bits */
+ uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */
+ struct msgb *msg, *dl_msg;
+ uint8_t bsn;
+ uint16_t mod_sns = tbf->sns - 1;
+ uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
+ uint16_t index;
+ uint8_t *delimiter, *data, *e_pointer;
+ uint8_t len;
+ uint16_t space, chunk;
+
+ LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. "
+ "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s);
+
+do_resend:
+ /* check if there is a block with negative acknowledgement */
+ for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
+ bsn = (bsn + 1) & mod_sns) {
+ index = (bsn & mod_sns_half);
+ if (tbf->dir.dl.v_b[index] == 'N'
+ || tbf->dir.dl.v_b[index] == 'X') {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n",
+ bsn);
+ /* re-send block with negative aknowlegement */
+ tbf->dir.dl.v_b[index] = 'U'; /* unacked */
+ goto tx_block;
+ }
+ }
+
+ /* if the window has stalled, or transfer is complete,
+ * send an unacknowledged block */
+ if (tbf->state == GPRS_RLCMAC_FINISHED
+ || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) {
+ int resend = 0;
+
+ if (tbf->state == GPRS_RLCMAC_FINISHED)
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, "
+ "because all blocks have been transmitted.\n",
+ tbf->dir.dl.v_a);
+ else
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, "
+ "because all window is stalled.\n",
+ tbf->dir.dl.v_a);
+ /* If V(S) == V(A) and finished state, we would have received
+ * acknowledgement of all transmitted block. In this case we
+ * would have transmitted the final block, and received ack
+ * from MS. But in this case we did not receive the final ack
+ * indication from MS. This should never happen if MS works
+ * correctly. */
+ if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) {
+ LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block "
+ "(including final block), but did not include "
+ "FINAL_ACK_INDICATION!\n");
+ /* we just send final block again */
+ index = ((tbf->dir.dl.v_s - 1) & mod_sns_half);
+ goto tx_block;
+ }
+
+ /* cycle through all unacked blocks */
+ for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
+ bsn = (bsn + 1) & mod_sns) {
+ index = (bsn & mod_sns_half);
+ if (tbf->dir.dl.v_b[index] == 'U') {
+ /* mark to be re-send */
+ tbf->dir.dl.v_b[index] = 'X';
+ resend++;
+ }
+ }
+ /* At this point there should be at leasst one unacked block
+ * to be resent. If not, this is an software error. */
+ if (resend == 0) {
+ LOGP(DRLCMACDL, LOGL_ERROR, "Software error: "
+ "There are no unacknowledged blocks, but V(A) "
+ " != V(S). PLEASE FIX!\n");
+ /* we just send final block again */
+ index = ((tbf->dir.dl.v_s - 1) & mod_sns_half);
+ goto tx_block;
+ }
+ goto do_resend;
+ }
+
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n",
+ tbf->dir.dl.v_s);
+
+ /* now we still have untransmitted LLC data, so we fill mac block */
+ index = tbf->dir.dl.v_s & mod_sns_half;
+ data = tbf->rlc_block[index];
+ switch (bts->initial_cs) {
+ case 2: /* CS-2 */
+ block_length = 34;
+ block_data = 33;
+ break;
+ case 3: /* CS-3 */
+ block_length = 40;
+ block_data = 39;
+ break;
+ case 4: /* CS-4 */
+ block_length = 54;
+ block_data = 53;
+ break;
+ default: /* CS-1 */
+ block_length = 23;
+ block_data = 23;
+ }
+ memset(data, 0x2b, block_data); /* spare bits will be left 0 */
+ rh = (struct rlc_dl_header *)data;
+ rh->pt = 0; /* Data Block */
+ rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */
+ rh->usf = 7; /* will be set at scheduler */
+ rh->pr = 0; /* FIXME: power reduction */
+ rh->tfi = tbf->tfi; /* TFI */
+ rh->fbi = 0; /* Final Block Indicator, set late, if true */
+ rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */
+ rh->e = 0; /* Extension bit, maybe set later */
+ e_pointer = data + 2; /* points to E of current chunk */
+ data += 3;
+ delimiter = data; /* where next length header would be stored */
+ space = block_data - 3;
+ while (1) {
+ chunk = tbf->llc_length - tbf->llc_index;
+ /* if chunk will exceed block limit */
+ if (chunk > space) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
+ "larger than space (%d) left in block: copy "
+ "only remaining space, and we are done\n",
+ chunk, space);
+ /* block is filled, so there is no extension */
+ *e_pointer |= 0x01;
+ /* fill only space */
+ memcpy(data, tbf->llc_frame + tbf->llc_index, space);
+ /* incement index */
+ tbf->llc_index += space;
+ /* return data block as message */
+ break;
+ }
+ /* if FINAL chunk would fit precisely in space left */
+ if (chunk == space && llist_empty(&tbf->llc_queue)) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
+ "would exactly fit into space (%d): because "
+ "this is a final block, we don't add length "
+ "header, and we are done\n", chunk, space);
+ LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for "
+ "TBF=%d that fits precisely in last block: "
+ "%s\n", tbf->tfi,
+ osmo_hexdump(tbf->llc_frame, tbf->llc_length));
+ /* block is filled, so there is no extension */
+ *e_pointer |= 0x01;
+ /* fill space */
+ memcpy(data, tbf->llc_frame + tbf->llc_index, space);
+ /* reset LLC frame */
+ tbf->llc_index = tbf->llc_length = 0;
+ /* final block */
+ rh->fbi = 1; /* we indicate final block */
+ tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
+ /* return data block as message */
+ break;
+ }
+ /* if chunk would fit exactly in space left */
+ if (chunk == space) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
+ "would exactly fit into space (%d): add length "
+ "header with LI=0, to make frame extend to "
+ "next block, and we are done\n", chunk, space);
+ /* make space for delimiter */
+ if (delimiter != data)
+ memcpy(delimiter + 1, delimiter,
+ data - delimiter);
+ data++;
+ space--;
+ /* add LI with 0 length */
+ li = (struct rlc_li_field *)delimiter;
+ li->e = 1; /* not more extension */
+ li->m = 0; /* shall be set to 0, in case of li = 0 */
+ li->li = 0; /* chunk fills the complete space */
+ // no need to set e_pointer nor increase delimiter
+ /* fill only space, which is 1 octet less than chunk */
+ memcpy(data, tbf->llc_frame + tbf->llc_index, space);
+ /* incement index */
+ tbf->llc_index += space;
+ /* return data block as message */
+ break;
+ }
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less "
+ "than remaining space (%d): add length header to "
+ "to delimit LLC frame\n", chunk, space);
+ /* the LLC frame chunk ends in this block */
+ /* make space for delimiter */
+ if (delimiter != data)
+ memcpy(delimiter + 1, delimiter, data - delimiter);
+ data++;
+ space--;
+ /* add LI to delimit frame */
+ li = (struct rlc_li_field *)delimiter;
+ li->e = 0; /* Extension bit, maybe set later */
+ li->m = 0; /* will be set later, if there is more LLC data */
+ li->li = chunk; /* length of chunk */
+ e_pointer = delimiter; /* points to E of current delimiter */
+ delimiter++;
+ /* copy (rest of) LLC frame to space */
+ memcpy(data, tbf->llc_frame + tbf->llc_index, chunk);
+ data += chunk;
+ space -= chunk;
+ LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: %s\n",
+ tbf->tfi,
+ osmo_hexdump(tbf->llc_frame, tbf->llc_length));
+ /* reset LLC frame */
+ tbf->llc_index = tbf->llc_length = 0;
+ /* dequeue next LLC frame, if any */
+ msg = msgb_dequeue(&tbf->llc_queue);
+ if (msg) {
+ LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for "
+ "TBF=%d (len=%d)\n", tbf->tfi, msg->len);
+ memcpy(tbf->llc_frame, msg->data, msg->len);
+ tbf->llc_length = msg->len;
+ msgb_free(msg);
+ }
+ /* if we have more data and we have space left */
+ if (space > 0 && tbf->llc_length) {
+ li->m = 1; /* we indicate more frames to follow */
+ continue;
+ }
+ /* if we don't have more LLC frames */
+ if (!tbf->llc_length) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we "
+ "done.\n");
+ li->e = 1; /* we cannot extend */
+ rh->fbi = 1; /* we indicate final block */
+ tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
+ break;
+ }
+ /* we have no space left */
+ LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are "
+ "done.\n");
+ li->e = 1; /* we cannot extend */
+ break;
+ }
+ LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n",
+ osmo_hexdump(tbf->rlc_block[index], block_length));
+ tbf->rlc_block_len[index] = block_length;
+ /* raise send state and set ack state array */
+ tbf->dir.dl.v_b[index] = 'U'; /* unacked */
+ tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */
+
+tx_block:
+ /* from this point on, new block is sent or old block is resent */
+
+ /* get data and header from current block */
+ data = tbf->rlc_block[index];
+ len = tbf->rlc_block_len[index];
+ rh = (struct rlc_dl_header *)data;
+
+ /* Increment TX-counter */
+ tbf->dir.dl.tx_counter++;
+
+ /* Clear Polling, if still set in history buffer */
+ rh->s_p = 0;
+
+ /* poll after ACK_AFTER_FRAMES frames, or when final block is tx. */
+ if (rh->fbi == 1 || (tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) {
+ if (rh->fbi == 1) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
+ "polling, because final block sent.\n");
+ }
+ if ((tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
+ "polling, because %d blocks sent.\n",
+ ACK_AFTER_FRAMES);
+ }
+ if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE)
+ LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already "
+ "sheduled for TBF=%d, so we must wait for "
+ "requesting downlink ack\n", tbf->tfi);
+ else {
+ /* start timer whenever we send the final block */
+ if (rh->fbi == 1)
+ tbf_timer_start(tbf, 3191, bts->t3191, 0);
+
+ /* schedule polling */
+ tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
+ tbf->poll_fn = (fn + 13) % 2715648;
+
+ /* set polling in header */
+ rh->rrbp = 0; /* N+13 */
+ rh->s_p = 1; /* Polling */
+ }
+ }
+
+ /* return data block as message */
+ dl_msg = msgb_alloc(len, "rlcmac_dl_data");
+ if (!dl_msg)
+ return NULL;
+ memcpy(msgb_put(dl_msg, len), data, len);
+
+ return dl_msg;
+}
+
+int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final,
+ uint8_t ssn, uint8_t *rbb)
+{
+ char show_rbb[65], show_v_b[RLC_MAX_SNS + 1];
+ uint16_t mod_sns = tbf->sns - 1;
+ uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
+ int i; /* must be signed */
+ int16_t dist; /* must be signed */
+ uint8_t bit;
+ uint16_t bsn;
+ struct msgb *msg;
+
+ LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n",
+ tbf->tfi);
+
+ if (!final) {
+ /* show received array in debug (bit 64..1) */
+ for (i = 63; i >= 0; i--) {
+ bit = (rbb[i >> 3] >> (7 - (i&7))) & 1;
+ show_rbb[i] = (bit) ? '1' : 'o';
+ }
+ show_rbb[64] = '\0';
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\""
+ "(BSN=%d) 1=ACK o=NACK\n", ssn - 64, show_rbb,
+ ssn - 1);
+
+ /* apply received array to receive state (SSN-64..SSN-1) */
+ /* calculate distance of ssn from V(S) */
+ dist = (tbf->dir.dl.v_s - ssn) & mod_sns;
+ /* check if distance is less than distance V(A)..V(S) */
+ if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) {
+ /* SSN - 1 is in range V(A)..V(S)-1 */
+ for (i = 63, bsn = (ssn - 1) & mod_sns;
+ i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns);
+ i--, bsn = (bsn - 1) & mod_sns) {
+ bit = (rbb[i >> 3] >> (7 - (i&7))) & 1;
+ if (bit) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- got "
+ "ack for BSN=%d\n", bsn);
+ tbf->dir.dl.v_b[bsn & mod_sns_half]
+ = 'A';
+ } else {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- got "
+ "NACK for BSN=%d\n", bsn);
+ tbf->dir.dl.v_b[bsn & mod_sns_half]
+ = 'N';
+ }
+ }
+ } else {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- ack range is out of "
+ "V(A)..V(S) range\n");
+ }
+
+ /* raise V(A), if possible */
+ for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
+ i++, bsn = (bsn + 1) & mod_sns) {
+ if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') {
+ tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I';
+ /* mark invalid */
+ tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1)
+ & mod_sns;
+ } else
+ break;
+ }
+
+ /* show receive state array in debug (V(A)..V(S)-1) */
+ for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
+ i++, bsn = (bsn + 1) & mod_sns) {
+ show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half];
+ if (show_v_b[i] == 0)
+ show_v_b[i] = ' ';
+ }
+ show_v_b[i] = '\0';
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\""
+ "(V(S)-1=%d) A=Acked N=Nacked U=Unacked "
+ "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b,
+ (tbf->dir.dl.v_s - 1) & mod_sns);
+
+ return 0;
+ }
+
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n");
+
+ /* check for LLC PDU in the LLC Queue */
+ msg = msgb_dequeue(&tbf->llc_queue);
+ if (!msg) {
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+ /* no message, start T3193, change state to RELEASE */
+ LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we "
+ "release.\n");
+ /* start T3193 */
+ tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000,
+ bts->t3193_msec & 1000);
+ tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE);
+
+ return 0;
+ }
+ memcpy(tbf->llc_frame, msg->data, msg->len);
+ tbf->llc_length = msg->len;
+ msgb_free(msg);
+
+ /* we have a message, so we trigger downlink assignment, and there
+ * set the state to ASSIGN. also we set old_downlink, because we
+ * re-use this tbf. */
+ LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, "
+ "because another LLC PDU has arrived in between\n");
+ memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */
+ gprs_rlcmac_trigger_downlink_assignment(tbf, 1, NULL);
+
+ return 0;
+}
+
+
+struct msgb *gprs_rlcmac_send_packet_downlink_assignment(
+ struct gprs_rlcmac_tbf *tbf, uint32_t fn)
+{
+ struct msgb *msg;
+ struct gprs_rlcmac_tbf *new_tbf;
+
+ if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
+ LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already "
+ "sheduled for TBF=%d, so we must wait for downlink "
+ "assignment...\n", tbf->tfi);
+ return NULL;
+ }
+
+ /* on uplink TBF we get the downlink TBF to be assigned. */
+ if (tbf->direction == GPRS_RLCMAC_UL_TBF)
+ new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF);
+ else
+ new_tbf = tbf;
+ if (!new_tbf) {
+ LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink "
+ "assignment at uplink TBF=%d, but there is no downlink "
+ "TBF\n", tbf->tfi);
+ tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
+ return NULL;
+ }
+
+ msg = msgb_alloc(23, "rlcmac_dl_ass");
+ if (!msg)
+ return NULL;
+ bitvec *ass_vec = bitvec_alloc(23);
+ if (!ass_vec) {
+ msgb_free(msg);
+ return NULL;
+ }
+ bitvec_unhex(ass_vec,
+ "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
+ LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli);
+ RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
+ write_packet_downlink_assignment(mac_control_block, tbf->tfi,
+ (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf->tfi,
+ new_tbf->arfcn, new_tbf->ts, new_tbf->ta, new_tbf->tsc,
+ POLLING_ASSIGNMENT);
+ LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
+ encode_gsm_rlcmac_downlink(ass_vec, mac_control_block);
+ LOGPC(DCSN1, LOGL_NOTICE, "\n");
+ LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
+ bitvec_pack(ass_vec, msgb_put(msg, 23));
+ bitvec_free(ass_vec);
+ free(mac_control_block);
+
+#if POLLING_ASSIGNMENT == 1
+ tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
+ tbf->poll_fn = (fn + 13) % 2715648;
+ tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK;
+#else
+ tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
+#endif
+
+ return msg;
+}
+
+static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll,
+ char *imsi)
+{
+ LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u TLLI: 0x%08x Immediate Assignment Downlink (PCH)\n", tbf->tfi, tbf->tlli);
+ bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */
+ bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
+ /* use request reference that has maximum distance to current time,
+ * so the assignment will not conflict with possible RACH requests. */
+ int plen = write_immediate_assignment(immediate_assignment, 1, 125, (tbf->pdch->last_rts_fn + 21216) % 2715648, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, tbf->poll_fn);
+ pcu_l1if_tx_pch(immediate_assignment, plen, imsi);
+ bitvec_free(immediate_assignment);
+}
+
+/* depending on the current TBF, we assign on PACCH or AGCH */
+void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf,
+ uint8_t old_downlink, char *imsi)
+{
+ gprs_rlcmac_tbf *old_tbf;
+
+#ifdef DEBUG_DL_ASS_IDLE
+ strncpy(debug_imsi, imsi);
+ LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n");
+#endif
+
+ /* stop pending timer */
+ tbf_timer_stop(tbf);
+
+ /* check for downlink tbf: */
+ if (old_downlink)
+ old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF);
+ else
+ old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF);
+ if (old_tbf) {
+#ifdef DEBUG_DL_ASS_IDLE
+ LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be "
+ "released.\n");
+ /* wait one second until assignment */
+ tbf_timer_start(tbf, 1234, 1,0);
+#else
+ LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on "
+ "PACCH, because %slink TBF=%d exists for TLLI=0x%08x\n",
+ (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "down" : "up",
+ old_tbf->tfi, old_tbf->tlli);
+ old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
+ /* use TA from old TBF */
+ tbf->ta = old_tbf->ta;
+ /* change state */
+ tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
+ /* start timer */
+ tbf_timer_start(tbf, 0, Tassign_pacch);
+#endif
+ } else {
+ LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi);
+ if (!imsi || strlen(imsi) < 3) {
+ LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n");
+ return;
+ }
+ /* send immediate assignment */
+ gprs_rlcmac_downlink_assignment(tbf, 0, imsi);
+ /* change state */
+ tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
+ /* start timer */
+ tbf_timer_start(tbf, 0, Tassign_agch);
+ }
+ }
+
diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp
new file mode 100644
index 0000000..4a4b85c
--- /dev/null
+++ b/src/gprs_rlcmac_sched.cpp
@@ -0,0 +1,184 @@
+/* PDCH scheduler
+ *
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <gprs_bssgp_pcu.h>
+#include <gprs_rlcmac.h>
+#include <pcu_l1_if.h>
+
+extern struct llist_head block_queue;
+
+static uint8_t rlcmac_dl_idle[23] = {
+ 0x47, /* control without optional header octets, no polling, USF=111 */
+ 0x94, /* dummy downlink control message, paging mode 00 */
+ 0x2b, /* no persistance level, 7 bits spare pattern */
+ 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
+ 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
+};
+
+int gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn,
+ uint32_t fn, uint8_t block_nr)
+{
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_pdch *pdch;
+ struct gprs_rlcmac_tbf *tbf;
+ uint8_t usf = 0x7;
+ struct msgb *msg = NULL;
+ uint32_t poll_fn;
+ uint8_t i, tfi;
+
+ if (trx >= 8 || ts >= 8)
+ return -EINVAL;
+ pdch = &bts->trx[trx].pdch[ts];
+
+ if (!pdch->enable) {
+ LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: "
+ "TRX=%d TS=%d\n", trx, ts);
+ return -EIO;
+ }
+
+ /* store last frame number of RTS */
+ pdch->last_rts_fn = fn;
+
+ /* check uplink ressource for polling */
+ poll_fn = fn + 4;
+ if ((block_nr % 3) == 2)
+ poll_fn ++;
+ poll_fn = poll_fn % 2715648;
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = pdch->tbf[tfi];
+ /* no TBF for this tfi, go next */
+ if (!tbf)
+ continue;
+ /* no polling */
+ if (tbf->poll_state != GPRS_RLCMAC_POLL_SCHED)
+ continue;
+ /* polling for next uplink block */
+ if (tbf->poll_fn == poll_fn)
+ break;
+ }
+ /* found uplink where a block is polled */
+ if (tfi < 32) {
+ LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d "
+ "TS=%d FN=%d block_nr=%d scheduling free USF for "
+ "polling at FN=%d of TFI=%d\n", trx, ts, fn, block_nr,
+ poll_fn, tfi);
+ /* use free USF */
+ /* else, we search for uplink ressource */
+ } else {
+ /* select uplink ressource */
+ for (i = 0, tfi = pdch->next_ul_tfi; i < 32;
+ i++, tfi = (tfi + 1) & 31) {
+ tbf = pdch->tbf[tfi];
+ /* no TBF for this tfi, go next */
+ if (!tbf)
+ continue;
+ /* no UL TBF, go next */
+ if (tbf->direction != GPRS_RLCMAC_UL_TBF)
+ continue;
+ /* no UL ressources needed, go next */
+ /* we don't need to give ressources in FINISHED state,
+ * because we have received all blocks and only poll
+ * for packet control ack. */
+ if (tbf->state != GPRS_RLCMAC_FLOW)
+ continue;
+
+ /* use this USF */
+ usf = tbf->dir.ul.usf;
+ LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: "
+ "TRX=%d TS=%d FN=%d block_nr=%d scheduling "
+ "USF=%d for required uplink ressource of "
+ "TBF=%d\n", trx, ts, fn, block_nr, usf, tfi);
+ /* next TBF to handle ressource is the next one */
+ pdch->next_ul_tfi = (tfi + 1) & 31;
+ break;
+ }
+ }
+
+ /* Prio 1: select control message */
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = pdch->tbf[tfi];
+ /* no TBF for this tfi, go next */
+ if (!tbf)
+ continue;
+ /* schedule PACKET DOWNLINK ASSIGNMENT */
+ if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS)
+ msg = gprs_rlcmac_send_packet_downlink_assignment(tbf,
+ fn);
+ else
+ /* schedule PACKET UPLINK ASSIGNMENT */
+ if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS)
+ msg = gprs_rlcmac_send_packet_uplink_assignment(tbf,
+ fn);
+ else
+ /* schedule PACKET UPLINK ACK */
+ if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK)
+ msg = gprs_rlcmac_send_uplink_ack(tbf, fn);
+ if (msg) {
+ LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
+ "message at RTS for TBF=%d\n", tfi);
+ break;
+ }
+ }
+
+ /* Prio 2: select data message for downlink */
+ if (!msg) {
+ /* select downlink ressource */
+ for (i = 0, tfi = pdch->next_dl_tfi; i < 32;
+ i++, tfi = (tfi + 1) & 31) {
+ tbf = pdch->tbf[tfi];
+ /* no TBF for this tfi, go next */
+ if (!tbf)
+ continue;
+ /* no DL TBF, go next */
+ if (tbf->direction != GPRS_RLCMAC_DL_TBF)
+ continue;
+ /* no DL ressources needed, go next */
+ if (tbf->state != GPRS_RLCMAC_FLOW
+ && tbf->state != GPRS_RLCMAC_FINISHED)
+ continue;
+
+ LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data "
+ "message at RTS for TBF=%d\n", tfi);
+ /* next TBF to handle ressource is the next one */
+ pdch->next_dl_tfi = (tfi + 1) & 31;
+ /* generate DL data block */
+ msg = gprs_rlcmac_send_data_block_acknowledged(tbf, fn);
+ break;
+ }
+ }
+
+ /* Prio 3: send dummy contol message */
+ if (!msg) {
+ msg = msgb_alloc(23, "rlcmac_dl_idle");
+ if (!msg)
+ return -ENOMEM;
+ memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23);
+ }
+ /* msg is now available */
+
+ /* set USF */
+ msg->data[0] = (msg->data[0] & 0xf8) | usf;
+
+// printf("len=%d, date=%s\n", msg->len, osmo_hexdump(msg->data, msg->len));
+
+ /* send PDTCH/PACCH to L1 */
+ pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr);
+
+ return 0;
+}
diff --git a/src/gsmL1prim.h b/src/gsmL1prim.h
deleted file mode 100644
index b348a1a..0000000
--- a/src/gsmL1prim.h
+++ /dev/null
@@ -1,415 +0,0 @@
-/*
-* Copyright 2012 Thomas Cooper <tacooper@vt.edu>
-*
-* This software is distributed under the terms of the GNU Affero Public License.
-* See the COPYING file in the main directory for details.
-*
-* This use of this software may be subject to additional restrictions.
-* See the LEGAL file in the main directory for details.
-
-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/>.
-
-*/
-
-#ifndef GSML1PRIM_H
-#define GSML1PRIM_H
-
-#include <stdint.h>
-
-typedef enum GsmL1_SubCh_t {
-GsmL1_SubCh_NA,
-} GsmL1_SubCh_t;
-
-typedef enum GsmL1_Sapi_t {
-GsmL1_Sapi_Fcch,
-GsmL1_Sapi_Sch,
-GsmL1_Sapi_Sacch,
-GsmL1_Sapi_Sdcch,
-GsmL1_Sapi_Bcch,
-GsmL1_Sapi_Pch,
-GsmL1_Sapi_Agch,
-GsmL1_Sapi_Cbch,
-GsmL1_Sapi_Rach,
-GsmL1_Sapi_TchF,
-GsmL1_Sapi_FacchF,
-GsmL1_Sapi_TchH,
-GsmL1_Sapi_FacchH,
-GsmL1_Sapi_Nch,
-GsmL1_Sapi_Pdtch,
-GsmL1_Sapi_Pacch,
-GsmL1_Sapi_Pbcch,
-GsmL1_Sapi_Pagch,
-GsmL1_Sapi_Ppch,
-GsmL1_Sapi_Pnch,
-GsmL1_Sapi_Ptcch,
-GsmL1_Sapi_Prach,
-GsmL1_Sapi_Idle,
-GsmL1_Sapi_NUM,
-} GsmL1_Sapi_t;
-
-typedef enum GsmL1_Status_t {
-GsmL1_Status_Success,
-GsmL1_Status_Generic,
-GsmL1_Status_NoMemory,
-GsmL1_Status_Timeout,
-GsmL1_Status_InvalidParam,
-GsmL1_Status_Busy,
-GsmL1_Status_NoRessource,
-GsmL1_Status_Uninitialized,
-GsmL1_Status_NullInterface,
-GsmL1_Status_NullFctnPtr,
-GsmL1_Status_BadCrc,
-GsmL1_Status_BadUsf,
-GsmL1_Status_InvalidCPS,
-GsmL1_Status_UnexpectedBurst,
-GsmL1_Status_UnavailCodec,
-GsmL1_Status_CriticalError,
-GsmL1_Status_OverheatError,
-GsmL1_Status_DeviceError,
-GsmL1_Status_FacchError,
-GsmL1_Status_AlreadyDeactivated,
-GsmL1_Status_TxBurstFifoOvrn,
-GsmL1_Status_TxBurstFifoUndr,
-GsmL1_Status_NotSynchronized,
-GsmL1_Status_Unsupported,
-GSML1_STATUS_NUM,
-} GsmL1_Status_t;
-
-typedef enum GsmL1_PrimId_t {
-GsmL1_PrimId_MphInitReq,
-GsmL1_PrimId_MphCloseReq,
-GsmL1_PrimId_MphConnectReq,
-GsmL1_PrimId_MphDisconnectReq,
-GsmL1_PrimId_MphActivateReq,
-GsmL1_PrimId_MphDeactivateReq,
-GsmL1_PrimId_MphConfigReq,
-GsmL1_PrimId_MphMeasureReq,
-GsmL1_PrimId_MphInitCnf,
-GsmL1_PrimId_MphCloseCnf,
-GsmL1_PrimId_MphConnectCnf,
-GsmL1_PrimId_MphDisconnectCnf,
-GsmL1_PrimId_MphActivateCnf,
-GsmL1_PrimId_MphDeactivateCnf,
-GsmL1_PrimId_MphConfigCnf,
-GsmL1_PrimId_MphMeasureCnf,
-GsmL1_PrimId_MphTimeInd,
-GsmL1_PrimId_MphSyncInd,
-GsmL1_PrimId_PhEmptyFrameReq,
-GsmL1_PrimId_PhDataReq,
-GsmL1_PrimId_PhConnectInd,
-GsmL1_PrimId_PhReadyToSendInd,
-GsmL1_PrimId_PhDataInd,
-GsmL1_PrimId_PhRaInd,
-GsmL1_PrimId_NUM,
-} GsmL1_PrimId_t;
-
-typedef enum GsmL1_Dir_t {
-GsmL1_Dir_TxDownlink,
-GsmL1_Dir_RxUplink,
-} GsmL1_Dir_t;
-
-typedef enum GsmL1_DevType_t {
-GsmL1_DevType_TxdRxu,
-} GsmL1_DevType_t;
-
-typedef enum GsmL1_TchPlType_t {
-GsmL1_TchPlType_NA,
-GsmL1_TchPlType_Efr,
-GsmL1_TchPlType_Fr,
-GsmL1_TchPlType_Hr,
-GsmL1_TchPlType_Amr,
-GsmL1_TchPlType_Amr_SidBad,
-GsmL1_TchPlType_Amr_Onset,
-GsmL1_TchPlType_Amr_Ratscch,
-GsmL1_TchPlType_Amr_SidUpdateInH,
-GsmL1_TchPlType_Amr_SidFirstP1,
-GsmL1_TchPlType_Amr_SidFirstP2,
-GsmL1_TchPlType_Amr_SidFirstInH,
-GsmL1_TchPlType_Amr_RatscchMarker,
-GsmL1_TchPlType_Amr_RatscchData,
-} GsmL1_TchPlType_t;
-
-typedef enum GsmL1_ConfigParamId_t {
-GsmL1_ConfigParamId_SetNbTsc,
-GsmL1_ConfigParamId_SetTxPowerLevel,
-GsmL1_ConfigParamId_SetLogChParams,
-GsmL1_ConfigParamId_SetCipheringParams,
-} GsmL1_ConfigParamId_t;
-
-typedef struct GsmL1_DeviceParam_t {
-enum GsmL1_DevType_t devType;
-int freqBand;
-uint16_t u16Arfcn;
-uint16_t u16BcchArfcn;
-uint8_t u8NbTsc;
-uint8_t u8Ncc;
-float fRxPowerLevel;
-float fTxPowerLevel;
-} GsmL1_DeviceParam_t;
-
-typedef struct GsmL1_MsgUnitParam_t {
-uint8_t u8Buffer[256];
-uint8_t u8Size;
-} GsmL1_MsgUnitParam_t;
-
-typedef struct GsmL1_MeasParam_t {
-float fRssi;
-float fLinkQuality;
-float fBer;
-int16_t i16BurstTiming;
-} GsmL1_MeasParam_t;
-
-typedef struct GsmL1_LogChParam_t {
-union {
-struct {
-enum GsmL1_TchPlType_t tchPlType;
-
-enum {
-GsmL1_AmrCmiPhase_NA,
-GsmL1_AmrCmiPhase_Odd,
-} amrCmiPhase;
-
-enum {
-GsmL1_AmrCodecMode_Unset,
-} amrInitCodecMode;
-
-enum {
-GsmL1_AmrCodec_Unset,
-GsmL1_AmrCodec_4_75,
-GsmL1_AmrCodec_5_15,
-GsmL1_AmrCodec_5_9,
-GsmL1_AmrCodec_6_7,
-GsmL1_AmrCodec_7_4,
-GsmL1_AmrCodec_7_95,
-GsmL1_AmrCodec_10_2,
-GsmL1_AmrCodec_12_2,
-} amrActiveCodecSet[8];
-} tch;
-
-struct {
-uint8_t u8Bsic;
-uint8_t u8NbrOfAgch;
-} rach;
-
-struct {
-uint8_t u8MsPowerLevel;
-} sacch;
-
-struct {
-uint8_t u8NbrOfAgch;
-} agch;
-};
-} GsmL1_LogChParam_t;
-
-typedef enum GsmL1_LogChComb_t {
-GsmL1_LogChComb_0,
-GsmL1_LogChComb_I,
-GsmL1_LogChComb_II,
-GsmL1_LogChComb_IV,
-GsmL1_LogChComb_V,
-GsmL1_LogChComb_VII,
-GsmL1_LogChComb_XIII,
-} GsmL1_LogChComb_t;
-
-enum {
-GsmL1_FreqBand_850,
-GsmL1_FreqBand_900,
-GsmL1_FreqBand_1800,
-GsmL1_FreqBand_1900,
-};
-
-typedef struct GsmL1_MphInitReq_t {
-struct GsmL1_DeviceParam_t deviceParam;
-} GsmL1_MphInitReq_t;
-
-typedef struct GsmL1_MphCloseReq_t {
-uint32_t hLayer1;
-} GsmL1_MphCloseReq_t;
-
-typedef struct GsmL1_MphConnectReq_t {
-uint32_t hLayer1;
-uint8_t u8Tn;
-enum GsmL1_LogChComb_t logChComb;
-} GsmL1_MphConnectReq_t;
-
-typedef struct GsmL1_MphDisconnectReq_t {
-uint32_t hLayer1;
-} GsmL1_MphDisconnectReq_t;
-
-typedef struct GsmL1_MphActivateReq_t {
-uint32_t hLayer1;
-struct GsmL1_LogChParam_t logChPrm;
-uint8_t u8Tn;
-enum GsmL1_SubCh_t subCh;
-enum GsmL1_Dir_t dir;
-enum GsmL1_Sapi_t sapi;
-uint32_t hLayer2;
-float fBFILevel;
-} GsmL1_MphActivateReq_t;
-
-typedef struct GsmL1_MphDeactivateReq_t {
-uint32_t hLayer1;
-uint8_t u8Tn;
-enum GsmL1_SubCh_t subCh;
-enum GsmL1_Dir_t dir;
-enum GsmL1_Sapi_t sapi;
-} GsmL1_MphDeactivateReq_t;
-
-typedef struct GsmL1_ConfigParam_t {
-struct {
-enum GsmL1_Sapi_t sapi;
-uint8_t u8Tn;
-enum GsmL1_SubCh_t subCh;
-enum GsmL1_Dir_t dir;
-struct GsmL1_LogChParam_t logChParams;
-} setLogChParams;
-} GsmL1_ConfigParam_t;
-
-typedef struct GsmL1_MphConfigReq_t {
-uint32_t hLayer1;
-enum GsmL1_ConfigParamId_t cfgParamId;
-struct GsmL1_ConfigParam_t cfgParams;
-} GsmL1_MphConfigReq_t;
-
-typedef struct GsmL1_MphConfigCnf_t {
-enum GsmL1_Status_t status;
-enum GsmL1_ConfigParamId_t cfgParamId;
-struct GsmL1_ConfigParam_t cfgParams;
-} GsmL1_MphConfigCnf_t;
-
-typedef struct GsmL1_MphMeasureReq_t {
-uint32_t hLayer1;
-} GsmL1_MphMeasureReq_t;
-
-typedef struct GsmL1_MphInitCnf_t {
-uint32_t hLayer1;
-enum GsmL1_Status_t status;
-} GsmL1_MphInitCnf_t;
-
-typedef struct GsmL1_MphCloseCnf_t {
-enum GsmL1_Status_t status;
-} GsmL1_MphCloseCnf_t;
-
-typedef struct GsmL1_MphConnectCnf_t {
-enum GsmL1_Status_t status;
-} GsmL1_MphConnectCnf_t;
-
-typedef struct GsmL1_MphDisconnectCnf_t {
-enum GsmL1_Status_t status;
-} GsmL1_MphDisconnectCnf_t;
-
-typedef struct GsmL1_MphActivateCnf_t {
-enum GsmL1_Status_t status;
-uint8_t u8Tn;
-int sapi;
-} GsmL1_MphActivateCnf_t;
-
-typedef struct GsmL1_MphDeactivateCnf_t {
-enum GsmL1_Status_t status;
-uint8_t u8Tn;
-enum GsmL1_Sapi_t sapi;
-} GsmL1_MphDeactivateCnf_t;
-
-typedef struct GsmL1_MphMeasureCnf_t {
-enum GsmL1_Status_t status;
-} GsmL1_MphMeasureCnf_t;
-
-typedef struct GsmL1_MphTimeInd_t {
-uint32_t u32Fn;
-} GsmL1_MphTimeInd_t;
-
-typedef struct GsmL1_MphSyncInd_t {
-} GsmL1_MphSyncInd_t;
-
-typedef struct GsmL1_PhEmptyFrameReq_t {
-uint32_t hLayer1;
-uint8_t u8Tn;
-uint32_t u32Fn;
-enum GsmL1_Sapi_t sapi;
-enum GsmL1_SubCh_t subCh;
-uint8_t u8BlockNbr;
-} GsmL1_PhEmptyFrameReq_t;
-
-typedef struct GsmL1_PhDataReq_t {
-uint32_t hLayer1;
-uint8_t u8Tn;
-uint32_t u32Fn;
-enum GsmL1_Sapi_t sapi;
-enum GsmL1_SubCh_t subCh;
-uint8_t u8BlockNbr;
-struct GsmL1_MsgUnitParam_t msgUnitParam;
-} GsmL1_PhDataReq_t;
-
-typedef struct GsmL1_PhConnectInd_t {
-uint8_t u8Tn;
-uint8_t u8Tsc;
-uint16_t u16Arfcn;
-} GsmL1_PhConnectInd_t;
-
-typedef struct GsmL1_PhReadyToSendInd_t {
-uint32_t hLayer1;
-uint8_t u8Tn;
-uint32_t u32Fn;
-enum GsmL1_Sapi_t sapi;
-enum GsmL1_SubCh_t subCh;
-uint8_t u8BlockNbr;
-uint32_t hLayer2;
-} GsmL1_PhReadyToSendInd_t;
-
-typedef struct GsmL1_PhDataInd_t {
-struct GsmL1_MeasParam_t measParam;
-struct GsmL1_MsgUnitParam_t msgUnitParam;
-enum GsmL1_Sapi_t sapi;
-uint32_t hLayer2;
-} GsmL1_PhDataInd_t;
-
-typedef struct GsmL1_PhRaInd_t {
-struct GsmL1_MeasParam_t measParam;
-struct GsmL1_MsgUnitParam_t msgUnitParam;
-uint32_t u32Fn;
-uint32_t hLayer2;
-} GsmL1_PhRaInd_t;
-
-typedef struct GsmL1_Prim_t {
-union {
-struct GsmL1_MphInitReq_t mphInitReq;
-struct GsmL1_MphCloseReq_t mphCloseReq;
-struct GsmL1_MphConnectReq_t mphConnectReq;
-struct GsmL1_MphDisconnectReq_t mphDisconnectReq;
-struct GsmL1_MphActivateReq_t mphActivateReq;
-struct GsmL1_MphDeactivateReq_t mphDeactivateReq;
-struct GsmL1_MphConfigReq_t mphConfigReq;
-struct GsmL1_MphMeasureReq_t mphMeasureReq;
-struct GsmL1_MphInitCnf_t mphInitCnf;
-struct GsmL1_MphCloseCnf_t mphCloseCnf;
-struct GsmL1_MphConnectCnf_t mphConnectCnf;
-struct GsmL1_MphDisconnectCnf_t mphDisconnectCnf;
-struct GsmL1_MphActivateCnf_t mphActivateCnf;
-struct GsmL1_MphDeactivateCnf_t mphDeactivateCnf;
-struct GsmL1_MphConfigCnf_t mphConfigCnf;
-struct GsmL1_MphMeasureCnf_t mphMeasureCnf;
-struct GsmL1_MphTimeInd_t mphTimeInd;
-struct GsmL1_MphSyncInd_t mphSyncInd;
-struct GsmL1_PhEmptyFrameReq_t phEmptyFrameReq;
-struct GsmL1_PhDataReq_t phDataReq;
-struct GsmL1_PhConnectInd_t phConnectInd;
-struct GsmL1_PhReadyToSendInd_t phReadyToSendInd;
-struct GsmL1_PhDataInd_t phDataInd;
-struct GsmL1_PhRaInd_t phRaInd;
-} u;
-
-enum GsmL1_PrimId_t id;
-} GsmL1_Prim_t;
-
-#endif
diff --git a/src/openbts_sock.cpp b/src/openbts_sock.cpp
new file mode 100644
index 0000000..cbf7adc
--- /dev/null
+++ b/src/openbts_sock.cpp
@@ -0,0 +1,183 @@
+/* openbts_sock.cpp
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <gprs_rlcmac.h>
+#include <gprs_bssgp_pcu.h>
+#include <pcu_l1_if.h>
+#include <gprs_debug.h>
+#include <bitvector.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+extern "C" {
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/write_queue.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <pcuif_proto.h>
+}
+
+struct femtol1_hdl {
+ struct gsm_time gsm_time;
+ uint32_t hLayer1; /* handle to the L1 instance in the DSP */
+ uint32_t dsp_trace_f;
+ uint16_t clk_cal;
+ struct llist_head wlc_list;
+
+ void *priv; /* user reference */
+
+ struct osmo_timer_list alive_timer;
+ unsigned int alive_prim_cnt;
+
+ struct osmo_fd read_ofd; /* osmo file descriptors */
+ struct osmo_wqueue write_q;
+
+ struct {
+ uint16_t arfcn;
+ uint8_t tn;
+ uint8_t tsc;
+ uint16_t ta;
+ } channel_info;
+
+};
+
+struct l1fwd_hdl {
+ struct sockaddr_storage remote_sa;
+ socklen_t remote_sa_len;
+
+ struct osmo_wqueue udp_wq;
+
+ struct femtol1_hdl *fl1h;
+};
+
+struct l1fwd_hdl *l1fh = talloc_zero(NULL, struct l1fwd_hdl);
+
+// TODO: We should move this parameters to config file.
+#define PCU_L1_IF_PORT 5944
+
+/* OpenBTS socket functions */
+
+int pcu_sock_send(struct msgb *msg)
+{
+ osmo_wqueue_enqueue(&l1fh->udp_wq, msg);
+ return 0;
+}
+
+/* data has arrived on the udp socket */
+static int udp_read_cb(struct osmo_fd *ofd)
+{
+ struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx");
+ struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
+ struct femtol1_hdl *fl1h = l1fh->fl1h;
+ int rc;
+
+ if (!msg)
+ return -ENOMEM;
+
+ msg->l1h = msg->data;
+
+ l1fh->remote_sa_len = sizeof(l1fh->remote_sa);
+ rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0,
+ (struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len);
+ if (rc < 0) {
+ perror("read from udp");
+ msgb_free(msg);
+ return rc;
+ } else if (rc == 0) {
+ perror("len=0 read from udp");
+ msgb_free(msg);
+ return rc;
+ }
+ msgb_put(msg, rc);
+
+ struct gsm_pcu_if *pcu_prim = (gsm_pcu_if *)(msg->l1h);
+ rc = pcu_rx(pcu_prim->msg_type, pcu_prim);
+ return rc;
+}
+
+/* callback when we can write to the UDP socket */
+static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+{
+ int rc;
+ struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
+
+ //LOGP(DPCU, LOGL_ERROR, "UDP: Writing %u bytes for MQ_L1_WRITE queue\n", msgb_length(msg));
+
+ rc = sendto(ofd->fd, msgb_data(msg), msgb_length(msg), 0,
+ (const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len);
+ if (rc < 0) {
+ LOGP(DPCU, LOGL_ERROR, "error writing to L1 msg_queue: %s\n",
+ strerror(errno));
+ return rc;
+ } else if (rc < (int)msgb_length(msg)) {
+ LOGP(DPCU, LOGL_ERROR, "short write to L1 msg_queue: "
+ "%u < %u\n", rc, msgb_length(msg));
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int pcu_l1if_open()
+{
+ struct femtol1_hdl *fl1h;
+ int rc;
+
+ /* allocate new femtol1_handle */
+ fl1h = talloc_zero(NULL, struct femtol1_hdl);
+ INIT_LLIST_HEAD(&fl1h->wlc_list);
+
+ l1fh->fl1h = fl1h;
+ fl1h->priv = l1fh;
+
+ struct osmo_wqueue * queue = &((l1fh->fl1h)->write_q);
+ osmo_wqueue_init(queue, 10);
+ queue->bfd.when |= BSC_FD_READ;
+ queue->bfd.data = l1fh;
+ queue->bfd.priv_nr = 0;
+
+ /* Open UDP */
+ struct osmo_wqueue *wq = &l1fh->udp_wq;
+
+ osmo_wqueue_init(wq, 10);
+ wq->write_cb = udp_write_cb;
+ wq->read_cb = udp_read_cb;
+ wq->bfd.when |= BSC_FD_READ;
+ wq->bfd.data = l1fh;
+ wq->bfd.priv_nr = 0;
+ rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM,
+ IPPROTO_UDP, NULL, PCU_L1_IF_PORT,
+ OSMO_SOCK_F_BIND);
+ if (rc < 0) {
+ perror("sock_init");
+ exit(1);
+ }
+
+ return 0;
+}
+
+void pcu_l1if_close(void)
+{
+ gprs_bssgp_destroy();
+
+ /* FIXME: cleanup l1if */
+ talloc_free(l1fh->fl1h);
+}
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 4186e29..fd8b3c3 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -1,6 +1,6 @@
/* pcu_l1_if.cpp
*
- * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -17,63 +17,25 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
#include <string.h>
-#include <gprs_rlcmac.h>
-#include <pcu_l1_if.h>
-#include <gprs_debug.h>
-#include <bitvector.h>
-#include <gsmL1prim.h>
+#include <errno.h>
+#include <assert.h>
#include <sys/socket.h>
-#include <linux/in.h>
+#include <sys/un.h>
extern "C" {
#include <osmocom/core/talloc.h>
-#include <osmocom/core/write_queue.h>
-#include <osmocom/core/socket.h>
-#include <osmocom/core/timer.h>
-#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/msgb.h>
}
-#define MAX_UDP_LENGTH 1500
-
-#define msgb_l1prim(msg) ((GsmL1_Prim_t *)(msg)->l1h)
-
-struct femtol1_hdl {
- struct gsm_time gsm_time;
- uint32_t hLayer1; /* handle to the L1 instance in the DSP */
- uint32_t dsp_trace_f;
- uint16_t clk_cal;
- struct llist_head wlc_list;
-
- void *priv; /* user reference */
-
- struct osmo_timer_list alive_timer;
- unsigned int alive_prim_cnt;
-
- struct osmo_fd read_ofd; /* osmo file descriptors */
- struct osmo_wqueue write_q;
-
- struct {
- uint16_t arfcn;
- uint8_t tn;
- uint8_t tsc;
- uint16_t ta;
- } channel_info;
-
-};
-
-struct l1fwd_hdl {
- struct sockaddr_storage remote_sa;
- socklen_t remote_sa_len;
-
- struct osmo_wqueue udp_wq;
-
- struct femtol1_hdl *fl1h;
-};
-
-struct l1fwd_hdl *l1fh = talloc_zero(NULL, struct l1fwd_hdl);
-
-struct pcu_l1if_bts pcu_l1if_bts;
+#include <gprs_rlcmac.h>
+#include <pcu_l1_if.h>
+#include <gprs_debug.h>
+#include <gprs_bssgp_pcu.h>
+#include <pcuif_proto.h>
// Variable for storage current FN.
int frame_number;
@@ -88,244 +50,398 @@ void set_current_fn(int fn)
frame_number = fn;
}
-struct msgb *l1p_msgb_alloc(void)
+/*
+ * PCU messages
+ */
+
+struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr)
{
- struct msgb *msg = msgb_alloc(sizeof(GsmL1_Prim_t), "l1_prim");
+ struct msgb *msg;
+ struct gsm_pcu_if *pcu_prim;
- if (msg)
- msg->l1h = msgb_put(msg, sizeof(GsmL1_Prim_t));
+ msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx");
+ if (!msg)
+ return NULL;
+ msgb_put(msg, sizeof(struct gsm_pcu_if));
+ pcu_prim = (struct gsm_pcu_if *) msg->data;
+ pcu_prim->msg_type = msg_type;
+ pcu_prim->bts_nr = bts_nr;
return msg;
}
-// Send RLC/MAC block to OpenBTS.
-void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
- uint32_t fn, uint8_t block_nr)
+static int pcu_tx_act_req(uint8_t trx, uint8_t ts, uint8_t activate)
{
- struct msgb *nmsg = l1p_msgb_alloc();
- GsmL1_Prim_t *prim = msgb_l1prim(nmsg);
-
- prim->id = GsmL1_PrimId_PhDataReq;
- prim->u.phDataReq.sapi = GsmL1_Sapi_Pdtch;
- memcpy(prim->u.phDataReq.msgUnitParam.u8Buffer, msg->data, msg->len);
- prim->u.phDataReq.msgUnitParam.u8Size = msg->len;
- osmo_wqueue_enqueue(&l1fh->udp_wq, nmsg);
- msgb_free(msg);
+ struct msgb *msg;
+ struct gsm_pcu_if *pcu_prim;
+ struct gsm_pcu_if_act_req *act_req;
+
+ LOGP(DL1IF, LOGL_INFO, "Sending %s request: trx=%d ts=%d\n",
+ (activate) ? "activate" : "deactivate", trx, ts);
+
+ msg = pcu_msgb_alloc(PCU_IF_MSG_ACT_REQ, 0);
+ if (!msg)
+ return -ENOMEM;
+ pcu_prim = (struct gsm_pcu_if *) msg->data;
+ act_req = &pcu_prim->u.act_req;
+ act_req->activate = activate;
+ act_req->trx_nr = trx;
+ act_req->ts_nr = ts;
+
+ return pcu_sock_send(msg);
}
-void pcu_l1if_tx_agch(bitvec * block, int len)
+static int pcu_tx_data_req(uint8_t trx, uint8_t ts, uint8_t sapi,
+ uint16_t arfcn, uint32_t fn, uint8_t block_nr, uint8_t *data,
+ uint8_t len)
{
- struct msgb *msg = l1p_msgb_alloc();
- GsmL1_Prim_t *prim = msgb_l1prim(msg);
-
- prim->id = GsmL1_PrimId_PhDataReq;
- prim->u.phDataReq.sapi = GsmL1_Sapi_Agch;
- bitvec_pack(block, prim->u.phDataReq.msgUnitParam.u8Buffer);
- prim->u.phDataReq.msgUnitParam.u8Size = len;
- osmo_wqueue_enqueue(&l1fh->udp_wq, msg);
+ struct msgb *msg;
+ struct gsm_pcu_if *pcu_prim;
+ struct gsm_pcu_if_data *data_req;
+
+ LOGP(DL1IF, LOGL_DEBUG, "Sending data request: trx=%d ts=%d sapi=%d "
+ "arfcn=%d fn=%d block=%d data=%s\n", trx, ts, sapi, arfcn, fn,
+ block_nr, osmo_hexdump(data, len));
+
+ msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_REQ, 0);
+ if (!msg)
+ return -ENOMEM;
+ pcu_prim = (struct gsm_pcu_if *) msg->data;
+ data_req = &pcu_prim->u.data_req;
+
+ data_req->sapi = sapi;
+ data_req->fn = fn;
+ data_req->arfcn = arfcn;
+ data_req->trx_nr = trx;
+ data_req->ts_nr = ts;
+ data_req->block_nr = block_nr;
+ memcpy(data_req->data, data, len);
+ data_req->len = len;
+
+ return pcu_sock_send(msg);
}
-void pcu_l1if_tx_pch(bitvec * block, int len)
+void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
+ uint32_t fn, uint8_t block_nr)
{
- struct msgb *msg = l1p_msgb_alloc();
- GsmL1_Prim_t *prim = msgb_l1prim(msg);
- prim->id = GsmL1_PrimId_PhDataReq;
- prim->u.phDataReq.sapi = GsmL1_Sapi_Pch;
- bitvec_pack(block, prim->u.phDataReq.msgUnitParam.u8Buffer);
- prim->u.phDataReq.msgUnitParam.u8Size = len;
- osmo_wqueue_enqueue(&l1fh->udp_wq, msg);
+ pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PDTCH, arfcn, fn, block_nr,
+ msg->data, msg->len);
+ msgb_free(msg);
}
-int pcu_l1if_rx_pdch(GsmL1_PhDataInd_t *data_ind)
+void pcu_l1if_tx_ptcch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
+ uint32_t fn, uint8_t block_nr)
{
- bitvec *block = bitvec_alloc(data_ind->msgUnitParam.u8Size);
- bitvec_unpack(block, data_ind->msgUnitParam.u8Buffer);
- gprs_rlcmac_rcv_block(block);
- bitvec_free(block);
-
- return 0;
+ pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PTCCH, arfcn, fn, block_nr,
+ msg->data, msg->len);
+ msgb_free(msg);
}
-static int handle_ph_connect_ind(struct femtol1_hdl *fl1, GsmL1_PhConnectInd_t *connect_ind)
+void pcu_l1if_tx_agch(bitvec * block, int plen)
{
- pcu_l1if_bts.trx[0].arfcn = connect_ind->u16Arfcn;
- pcu_l1if_bts.trx[0].ts[connect_ind->u8Tn].enable = 1;
- pcu_l1if_bts.trx[0].ts[connect_ind->u8Tn].tsc = connect_ind->u8Tsc;
- (l1fh->fl1h)->channel_info.arfcn = connect_ind->u16Arfcn;
- (l1fh->fl1h)->channel_info.tn = connect_ind->u8Tn;
- (l1fh->fl1h)->channel_info.tsc = connect_ind->u8Tsc;
- LOGP(DL1IF, LOGL_NOTICE, "RX: [ PCU <- BTS ] PhConnectInd: ARFCN: %u TN: %u TSC: %u \n",
- connect_ind->u16Arfcn, (unsigned)connect_ind->u8Tn, (unsigned)connect_ind->u8Tsc);
+ uint8_t data[23]; /* prefix PLEN */
+
+ /* FIXME: why does OpenBTS has no PLEN and no fill in message? */
+ bitvec_pack(block, data + 1);
+ data[0] = (plen << 2) | 0x01;
+ pcu_tx_data_req(0, 0, PCU_IF_SAPI_AGCH, 0, 0, 0, data, 23);
+}
- return 0;
+void pcu_l1if_tx_pch(bitvec * block, int plen, char *imsi)
+{
+ uint8_t data[23+3]; /* prefix PLEN */
+
+ /* paging group */
+ if (!imsi || strlen(imsi) < 3)
+ return;
+ imsi += strlen(imsi) - 3;
+ data[0] = imsi[0];
+ data[1] = imsi[1];
+ data[2] = imsi[2];
+
+ bitvec_pack(block, data + 3+1);
+ data[3] = (plen << 2) | 0x01;
+ pcu_tx_data_req(0, 0, PCU_IF_SAPI_PCH, 0, 0, 0, data, 23+3);
}
-static int handle_ph_readytosend_ind(struct femtol1_hdl *fl1, GsmL1_PhReadyToSendInd_t *readytosend_ind)
+static void pcu_l1if_tx_bcch(uint8_t *data, int len)
{
- gprs_rlcmac_rcv_rts_block(0,0, (l1fh->fl1h)->channel_info.arfcn, readytosend_ind->u32Fn, 0);
- return 1;
+ pcu_tx_data_req(0, 0, PCU_IF_SAPI_BCCH, 0, 0, 0, data, len);
}
-static int handle_ph_data_ind(struct femtol1_hdl *fl1, GsmL1_PhDataInd_t *data_ind)
+static int pcu_rx_data_ind(struct gsm_pcu_if_data *data_ind)
{
int rc = 0;
+
+ LOGP(DL1IF, LOGL_DEBUG, "Data indication received: sapi=%d arfcn=%d "
+ "block=%d data=%s\n", data_ind->sapi,
+ data_ind->arfcn, data_ind->block_nr,
+ osmo_hexdump(data_ind->data, data_ind->len));
+
switch (data_ind->sapi) {
- case GsmL1_Sapi_Rach:
- break;
- case GsmL1_Sapi_Pdtch:
- case GsmL1_Sapi_Pacch:
- pcu_l1if_rx_pdch(data_ind);
- break;
- case GsmL1_Sapi_Pbcch:
- case GsmL1_Sapi_Pagch:
- case GsmL1_Sapi_Ppch:
- case GsmL1_Sapi_Pnch:
- case GsmL1_Sapi_Ptcch:
- case GsmL1_Sapi_Prach:
+ case PCU_IF_SAPI_PDTCH:
+ rc = gprs_rlcmac_rcv_block(data_ind->data, data_ind->len,
+ data_ind->fn);
break;
default:
- LOGP(DL1IF, LOGL_NOTICE, "Rx PH-DATA.ind for unknown L1 SAPI %u \n", data_ind->sapi);
- break;
+ LOGP(DL1IF, LOGL_ERROR, "Received PCU data indication with "
+ "unsupported sapi %d\n", data_ind->sapi);
+ rc = -EINVAL;
}
return rc;
}
-static int handle_ph_ra_ind(struct femtol1_hdl *fl1, GsmL1_PhRaInd_t *ra_ind)
+static int pcu_rx_rts_req(struct gsm_pcu_if_rts_req *rts_req)
{
int rc = 0;
- (l1fh->fl1h)->channel_info.ta = ra_ind->measParam.i16BurstTiming;
- rc = gprs_rlcmac_rcv_rach(ra_ind->msgUnitParam.u8Buffer[0], ra_ind->u32Fn, ra_ind->measParam.i16BurstTiming);
- return rc;
-}
-/* handle any random indication from the L1 */
-int pcu_l1if_handle_l1prim(struct femtol1_hdl *fl1, struct msgb *msg)
-{
- GsmL1_Prim_t *l1p = msgb_l1prim(msg);
- int rc = 0;
+ LOGP(DL1IF, LOGL_DEBUG, "RTS request received: trx=%d ts=%d sapi=%d "
+ "arfcn=%d fn=%d block=%d\n", rts_req->trx_nr, rts_req->ts_nr,
+ rts_req->sapi, rts_req->arfcn, rts_req->fn, rts_req->block_nr);
- switch (l1p->id) {
- case GsmL1_PrimId_PhConnectInd:
- rc = handle_ph_connect_ind(fl1, &l1p->u.phConnectInd);
- break;
- case GsmL1_PrimId_PhReadyToSendInd:
- rc = handle_ph_readytosend_ind(fl1, &l1p->u.phReadyToSendInd);
+ switch (rts_req->sapi) {
+ case PCU_IF_SAPI_PDTCH:
+ gprs_rlcmac_rcv_rts_block(rts_req->trx_nr, rts_req->ts_nr,
+ rts_req->arfcn, rts_req->fn, rts_req->block_nr);
break;
- case GsmL1_PrimId_PhDataInd:
- rc = handle_ph_data_ind(fl1, &l1p->u.phDataInd);
- break;
- case GsmL1_PrimId_PhRaInd:
- rc = handle_ph_ra_ind(fl1, &l1p->u.phRaInd);
+ case PCU_IF_SAPI_PTCCH:
+ /* FIXME */
+ {
+ struct msgb *msg = msgb_alloc(23, "l1_prim");
+ memset(msgb_put(msg, 23), 0x2b, 23);
+ pcu_l1if_tx_ptcch(msg, rts_req->trx_nr, rts_req->ts_nr,
+ rts_req->arfcn, rts_req->fn, rts_req->block_nr);
+ }
break;
default:
- break;
+ LOGP(DL1IF, LOGL_ERROR, "Received PCU RTS request with "
+ "unsupported sapi %d\n", rts_req->sapi);
+ rc = -EINVAL;
}
- /* Special return value '1' means: do not free */
- if (rc != 1)
- msgb_free(msg);
-
return rc;
}
-/* OpenBTS socket functions */
-
-// TODO: We should move this parameters to config file.
-#define PCU_L1_IF_PORT 5944
-
-/* data has arrived on the udp socket */
-static int udp_read_cb(struct osmo_fd *ofd)
+static int pcu_rx_rach_ind(struct gsm_pcu_if_rach_ind *rach_ind)
{
- struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx");
- struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
- struct femtol1_hdl *fl1h = l1fh->fl1h;
- int rc;
-
- if (!msg)
- return -ENOMEM;
+ int rc = 0;
- msg->l1h = msg->data;
+ LOGP(DL1IF, LOGL_INFO, "RACH request received: sapi=%d "
+ "qta=%d, ra=%d, fn=%d\n", rach_ind->sapi, rach_ind->qta,
+ rach_ind->ra, rach_ind->fn);
- l1fh->remote_sa_len = sizeof(l1fh->remote_sa);
- rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0,
- (struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len);
- if (rc < 0) {
- perror("read from udp");
- msgb_free(msg);
- return rc;
- } else if (rc == 0) {
- perror("len=0 read from udp");
- msgb_free(msg);
- return rc;
+ switch (rach_ind->sapi) {
+ case PCU_IF_SAPI_RACH:
+ rc = gprs_rlcmac_rcv_rach(rach_ind->ra, rach_ind->fn,
+ rach_ind->qta);
+ break;
+ default:
+ LOGP(DL1IF, LOGL_ERROR, "Received PCU rach request with "
+ "unsupported sapi %d\n", rach_ind->sapi);
+ rc = -EINVAL;
}
- msgb_put(msg, rc);
- rc = pcu_l1if_handle_l1prim(fl1h, msg);
return rc;
}
-/* callback when we can write to the UDP socket */
-static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+static int pcu_rx_info_ind(struct gsm_pcu_if_info_ind *info_ind)
{
- int rc;
- struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
-
- //DEBUGP(DGPRS, "UDP: Writing %u bytes for MQ_L1_WRITE queue\n", msgb_l1len(msg));
-
- rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0,
- (const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len);
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ int rc = 0;
+ int trx, ts, tfi;
+ struct gprs_rlcmac_tbf *tbf;
+ int i;
+
+ LOGP(DL1IF, LOGL_DEBUG, "Info indication received:\n");
+
+ if (!(info_ind->flags & PCU_IF_FLAG_ACTIVE)) {
+ LOGP(DL1IF, LOGL_NOTICE, "BTS not available\n");
+bssgp_failed:
+ /* free all TBF */
+ for (trx = 0; trx < 8; trx++) {
+ bts->trx[trx].arfcn = info_ind->trx[trx].arfcn;
+ for (ts = 0; ts < 8; ts++) {
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = bts->trx[trx].pdch[ts].tbf[tfi];
+ if (tbf)
+ tbf_free(tbf);
+ }
+ }
+ }
+ gprs_bssgp_destroy();
+ return 0;
+ }
+ LOGP(DL1IF, LOGL_INFO, "BTS available\n");
+ LOGP(DL1IF, LOGL_DEBUG, " mcc=%d\n", info_ind->mcc);
+ LOGP(DL1IF, LOGL_DEBUG, " mnc=%d\n", info_ind->mnc);
+ LOGP(DL1IF, LOGL_DEBUG, " lac=%d\n", info_ind->lac);
+ LOGP(DL1IF, LOGL_DEBUG, " rac=%d\n", info_ind->rac);
+ LOGP(DL1IF, LOGL_DEBUG, " cell_id=%d\n", info_ind->cell_id);
+ LOGP(DL1IF, LOGL_DEBUG, " nsei=%d\n", info_ind->nsei);
+ LOGP(DL1IF, LOGL_DEBUG, " nse_timer=%d %d %d %d %d %d %d\n",
+ info_ind->nse_timer[0], info_ind->nse_timer[1],
+ info_ind->nse_timer[2], info_ind->nse_timer[3],
+ info_ind->nse_timer[4], info_ind->nse_timer[5],
+ info_ind->nse_timer[6]);
+ LOGP(DL1IF, LOGL_DEBUG, " cell_timer=%d %d %d %d %d %d %d %d %d %d "
+ "%d\n",
+ info_ind->cell_timer[0], info_ind->cell_timer[1],
+ info_ind->cell_timer[2], info_ind->cell_timer[3],
+ info_ind->cell_timer[4], info_ind->cell_timer[5],
+ info_ind->cell_timer[6], info_ind->cell_timer[7],
+ info_ind->cell_timer[8], info_ind->cell_timer[9],
+ info_ind->cell_timer[10]);
+ LOGP(DL1IF, LOGL_DEBUG, " repeat_time=%d\n", info_ind->repeat_time);
+ LOGP(DL1IF, LOGL_DEBUG, " repeat_count=%d\n", info_ind->repeat_count);
+ LOGP(DL1IF, LOGL_DEBUG, " bvci=%d\n", info_ind->bvci);
+ LOGP(DL1IF, LOGL_DEBUG, " t3142=%d\n", info_ind->t3142);
+ LOGP(DL1IF, LOGL_DEBUG, " t3169=%d\n", info_ind->t3169);
+ LOGP(DL1IF, LOGL_DEBUG, " t3191=%d\n", info_ind->t3191);
+ LOGP(DL1IF, LOGL_DEBUG, " t3193=%d (ms)\n", info_ind->t3193_10ms * 10);
+ LOGP(DL1IF, LOGL_DEBUG, " t3195=%d\n", info_ind->t3195);
+ LOGP(DL1IF, LOGL_DEBUG, " n3101=%d\n", info_ind->n3101);
+ LOGP(DL1IF, LOGL_DEBUG, " n3103=%d\n", info_ind->n3103);
+ LOGP(DL1IF, LOGL_DEBUG, " n3105=%d\n", info_ind->n3105);
+ LOGP(DL1IF, LOGL_DEBUG, " cv_countdown=%d\n", info_ind->cv_countdown);
+ LOGP(DL1IF, LOGL_DEBUG, " dl_tbf_ext=%d\n", info_ind->dl_tbf_ext);
+ LOGP(DL1IF, LOGL_DEBUG, " ul_tbf_ext=%d\n", info_ind->ul_tbf_ext);
+ for (i = 0; i < 4; i++) {
+ if ((info_ind->flags & (PCU_IF_FLAG_CS1 << i)))
+ LOGP(DL1IF, LOGL_DEBUG, " Use CS%d\n", i+1);
+ }
+ for (i = 0; i < 9; i++) {
+ if ((info_ind->flags & (PCU_IF_FLAG_MCS1 << i)))
+ LOGP(DL1IF, LOGL_DEBUG, " Use MCS%d\n", i+1);
+ }
+ LOGP(DL1IF, LOGL_DEBUG, " initial_cs=%d\n", info_ind->initial_cs);
+ LOGP(DL1IF, LOGL_DEBUG, " initial_mcs=%d\n", info_ind->initial_mcs);
+ LOGP(DL1IF, LOGL_DEBUG, " nsvci=%d\n", info_ind->nsvci[0]);
+ LOGP(DL1IF, LOGL_DEBUG, " local_port=%d\n", info_ind->local_port[0]);
+ LOGP(DL1IF, LOGL_DEBUG, " remote_port=%d\n", info_ind->remote_port[0]);
+ LOGP(DL1IF, LOGL_DEBUG, " remote_ip=%d\n", info_ind->remote_ip[0]);
+
+ rc = gprs_bssgp_create(info_ind->remote_ip[0], info_ind->remote_port[0],
+ info_ind->nsei, info_ind->nsvci[0], info_ind->bvci,
+ info_ind->mcc, info_ind->mnc, info_ind->lac, info_ind->rac,
+ info_ind->cell_id);
if (rc < 0) {
- LOGP(DPCU, LOGL_ERROR, "error writing to L1 msg_queue: %s\n",
- strerror(errno));
- return rc;
- } else if (rc < (int)msgb_l1len(msg)) {
- LOGP(DPCU, LOGL_ERROR, "short write to L1 msg_queue: "
- "%u < %u\n", rc, msgb_l1len(msg));
- return -EIO;
+ LOGP(DL1IF, LOGL_NOTICE, "SGSN not available\n");
+ goto bssgp_failed;
}
- return 0;
+ bts->cs1 = !!(info_ind->flags & PCU_IF_FLAG_CS1);
+ bts->cs2 = !!(info_ind->flags & PCU_IF_FLAG_CS2);
+ bts->cs3 = !!(info_ind->flags & PCU_IF_FLAG_CS3);
+ bts->cs4 = !!(info_ind->flags & PCU_IF_FLAG_CS4);
+ if (!bts->cs1 && !bts->cs2 && !bts->cs3 && !bts->cs4)
+ bts->cs1 = 1;
+ if (info_ind->t3142) { /* if timer values are set */
+ bts->t3142 = info_ind->t3142;
+ bts->t3169 = info_ind->t3169;
+ bts->t3191 = info_ind->t3191;
+ bts->t3193_msec = info_ind->t3193_10ms * 10;
+ bts->t3195 = info_ind->t3195;
+ bts->n3101 = info_ind->n3101;
+ bts->n3103 = info_ind->n3103;
+ bts->n3105 = info_ind->n3105;
+ }
+ if (info_ind->initial_cs < 1 || info_ind->initial_cs > 4)
+ bts->initial_cs = 1;
+ else
+ bts->initial_cs = info_ind->initial_cs;
+
+ for (trx = 0; trx < 8; trx++) {
+ bts->trx[trx].arfcn = info_ind->trx[trx].arfcn;
+ for (ts = 0; ts < 8; ts++) {
+ if ((info_ind->trx[trx].pdch_mask & (1 << ts))) {
+ /* FIXME: activate dynamically at RLCMAC */
+ if (!bts->trx[trx].pdch[ts].enable)
+ pcu_tx_act_req(trx, ts, 1);
+ bts->trx[trx].pdch[ts].enable = 1;
+ bts->trx[trx].pdch[ts].tsc =
+ info_ind->trx[trx].tsc[ts];
+ LOGP(DL1IF, LOGL_INFO, "PDCH: trx=%d ts=%d\n",
+ trx, ts);
+ } else {
+ if (bts->trx[trx].pdch[ts].enable)
+ pcu_tx_act_req(trx, ts, 0);
+ bts->trx[trx].pdch[ts].enable = 0;
+ /* kick all tbf FIXME: multislot */
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = bts->trx[trx].pdch[ts].tbf[tfi];
+ if (tbf)
+ tbf_free(tbf);
+ }
+ }
+ }
+ }
+
+ return rc;
}
-int pcu_l1if_open()
+static int pcu_rx_time_ind(struct gsm_pcu_if_time_ind *time_ind)
{
- //struct l1fwd_hdl *l1fh;
- struct femtol1_hdl *fl1h;
- int rc;
-
- memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts));
-
- /* allocate new femtol1_handle */
- fl1h = talloc_zero(NULL, struct femtol1_hdl);
- INIT_LLIST_HEAD(&fl1h->wlc_list);
-
- l1fh->fl1h = fl1h;
- fl1h->priv = l1fh;
-
- struct osmo_wqueue * queue = &((l1fh->fl1h)->write_q);
- osmo_wqueue_init(queue, 10);
- queue->bfd.when |= BSC_FD_READ;
- queue->bfd.data = l1fh;
- queue->bfd.priv_nr = 0;
-
- /* Open UDP */
- struct osmo_wqueue *wq = &l1fh->udp_wq;
-
- osmo_wqueue_init(wq, 10);
- wq->write_cb = udp_write_cb;
- wq->read_cb = udp_read_cb;
- wq->bfd.when |= BSC_FD_READ;
- wq->bfd.data = l1fh;
- wq->bfd.priv_nr = 0;
- rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM,
- IPPROTO_UDP, NULL, PCU_L1_IF_PORT,
- OSMO_SOCK_F_BIND);
- if (rc < 0) {
- perror("sock_init");
- exit(1);
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ int trx, ts, tfi;
+ struct gprs_rlcmac_tbf *tbf;
+ uint32_t elapsed;
+ uint8_t fn13 = time_ind->fn % 13;
+
+ /* omit frame numbers not starting at a MAC block */
+ if (fn13 != 0 && fn13 != 4 && fn13 != 8)
+ return 0;
+
+ LOGP(DL1IF, LOGL_DEBUG, "Time indication received: %d\n",
+ time_ind->fn % 52);
+
+ set_current_fn(time_ind->fn);
+
+ /* check for poll timeout */
+ for (trx = 0; trx < 8; trx++) {
+ for (ts = 0; ts < 8; ts++) {
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = bts->trx[trx].pdch[ts].tbf[tfi];
+ if (!tbf)
+ continue;
+ if (tbf->poll_state != GPRS_RLCMAC_POLL_SCHED)
+ continue;
+ elapsed = (frame_number - tbf->poll_fn)
+ % 2715648;
+ if (elapsed >= 20 && elapsed < 200)
+ gprs_rlcmac_poll_timeout(tbf);
+ }
+ }
}
return 0;
}
+int pcu_rx(uint8_t msg_type, struct gsm_pcu_if *pcu_prim)
+{
+ int rc = 0;
+
+ switch (msg_type) {
+ case PCU_IF_MSG_DATA_IND:
+ rc = pcu_rx_data_ind(&pcu_prim->u.data_ind);
+ break;
+ case PCU_IF_MSG_RTS_REQ:
+ rc = pcu_rx_rts_req(&pcu_prim->u.rts_req);
+ break;
+ case PCU_IF_MSG_RACH_IND:
+ rc = pcu_rx_rach_ind(&pcu_prim->u.rach_ind);
+ break;
+ case PCU_IF_MSG_INFO_IND:
+ rc = pcu_rx_info_ind(&pcu_prim->u.info_ind);
+ break;
+ case PCU_IF_MSG_TIME_IND:
+ rc = pcu_rx_time_ind(&pcu_prim->u.time_ind);
+ break;
+ default:
+ LOGP(DL1IF, LOGL_ERROR, "Received unknwon PCU msg type %d\n",
+ msg_type);
+ rc = -EINVAL;
+ }
+
+ return rc;
+}
diff --git a/src/pcu_l1_if.h b/src/pcu_l1_if.h
index 82fa884..f3ac597 100644
--- a/src/pcu_l1_if.h
+++ b/src/pcu_l1_if.h
@@ -29,33 +29,19 @@ extern "C" {
#include <osmocom/gsm/gsm_utils.h>
}
-struct pcu_l1if_ts {
- uint8_t enable;
- uint8_t tsc;
-};
-
-struct pcu_l1if_trx {
- uint16_t arfcn;
- struct pcu_l1if_ts ts[8];
-};
-
-struct pcu_l1if_bts {
- struct pcu_l1if_trx trx[8];
-};
-
-extern struct pcu_l1if_bts pcu_l1if_bts;
-
int get_current_fn();
-void set_current_fn(int fn);
void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
uint32_t fn, uint8_t block_nr);
void pcu_l1if_tx_ptcch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
uint32_t fn, uint8_t block_nr);
void pcu_l1if_tx_agch(bitvec * block, int len);
-void pcu_l1if_tx_pch(bitvec * block, int len);
+
+void pcu_l1if_tx_pch(bitvec * block, int plen, char *imsi);
int pcu_l1if_open(void);
void pcu_l1if_close(void);
+int pcu_rx(uint8_t msg_type, struct gsm_pcu_if *pcu_prim);
+int pcu_sock_send(struct msgb *msg);
#endif // PCU_L1_IF_H
diff --git a/src/pcu_main.cpp b/src/pcu_main.cpp
index fa1ffb1..6c30c1e 100644
--- a/src/pcu_main.cpp
+++ b/src/pcu_main.cpp
@@ -20,66 +20,96 @@
#include <gprs_bssgp_pcu.h>
#include <arpa/inet.h>
#include <pcu_l1_if.h>
+#include <gprs_rlcmac.h>
#include <gsm_timer.h>
#include <gprs_debug.h>
+#include <unistd.h>
+#include <getopt.h>
-// TODO: We should move this parameters to config file.
-#define SGSN_IP "127.0.0.1"
-#define SGSN_PORT 23000
-#define NSVCI 4
+struct gprs_rlcmac_bts *gprs_rlcmac_bts;
+extern struct gprs_nsvc *nsvc;
+uint16_t spoof_mcc = 0, spoof_mnc = 0;
-int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci)
+static void print_help()
{
- int rc = 0;
- switch (event) {
- case GPRS_NS_EVT_UNIT_DATA:
- /* hand the message into the BSSGP implementation */
- rc = gprs_bssgp_pcu_rcvmsg(msg);
- break;
- default:
- LOGP(DPCU, LOGL_ERROR, "RLCMAC: Unknown event %u from NS\n", event);
- if (msg)
- talloc_free(msg);
- rc = -EIO;
- break;
+ printf( "Some useful options:\n"
+ " -h --help this text\n"
+ " -m --mcc MCC use given MCC instead of value "
+ "provided by BTS\n"
+ " -n --mnc MNC use given MNC instead of value "
+ "provided by BTS\n"
+ );
+}
+
+/* FIXME: finally get some option parsing code into libosmocore */
+static void handle_options(int argc, char **argv)
+{
+ while (1) {
+ int option_idx = 0, c;
+ static const struct option long_options[] = {
+ { "help", 0, 0, 'h' },
+ { "mcc", 1, 0, 'm' },
+ { "mnc", 1, 0, 'n' },
+ { 0, 0, 0, 0 }
+ };
+
+ c = getopt_long(argc, argv, "hm:n:",
+ long_options, &option_idx);
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'h':
+ print_help();
+ exit(0);
+ break;
+ case 'm':
+ spoof_mcc = atoi(optarg);
+ break;
+ case 'n':
+ spoof_mnc = atoi(optarg);
+ break;
+ default:
+ fprintf(stderr, "Unknown option '%c'\n", c);
+ exit(0);
+ break;
+ }
}
- return rc;
}
int main(int argc, char *argv[])
{
- uint16_t nsvci = NSVCI;
- struct gprs_ns_inst *sgsn_nsi;
- struct gprs_nsvc *nsvc;
- osmo_init_logging(&gprs_log_info);
- pcu_l1if_open();
+ struct gprs_rlcmac_bts *bts;
+ int rc;
- sgsn_nsi = gprs_ns_instantiate(&sgsn_ns_cb, NULL);
- bssgp_nsi = sgsn_nsi;
+ bts = gprs_rlcmac_bts = talloc_zero(NULL, struct gprs_rlcmac_bts);
+ if (!gprs_rlcmac_bts)
+ return -ENOMEM;
+ gprs_rlcmac_bts->initial_cs = 1;
+ bts->initial_cs = 1;
+ bts->cs1 = 1;
+ bts->t3142 = 20;
+ bts->t3169 = 5;
+ bts->t3191 = 5;
+ bts->t3193_msec = 100;
+ bts->t3195 = 5;
+ bts->n3101 = 10;
+ bts->n3103 = 4;
+ bts->n3105 = 8;
- if (!bssgp_nsi)
- {
- LOGP(DPCU, LOGL_ERROR, "Unable to instantiate NS\n");
- exit(1);
+ osmo_init_logging(&gprs_log_info);
+
+ handle_options(argc, argv);
+ if ((!!spoof_mcc) + (!!spoof_mnc) == 1) {
+ fprintf(stderr, "--mcc and --mnc must be specified "
+ "together.\n");
+ exit(0);
}
- bctx = btsctx_alloc(BVCI, NSEI);
- bctx->cell_id = CELL_ID;
- bctx->nsei = NSEI;
- bctx->ra_id.mnc = MNC;
- bctx->ra_id.mcc = MCC;
- bctx->ra_id.lac = PCU_LAC;
- bctx->ra_id.rac = PCU_RAC;
- bctx->bvci = BVCI;
- uint8_t cause = 39;
- gprs_ns_nsip_listen(sgsn_nsi);
+ rc = pcu_l1if_open();
- struct sockaddr_in dest;
- dest.sin_family = AF_INET;
- dest.sin_port = htons(SGSN_PORT);
- inet_aton(SGSN_IP, &dest.sin_addr);
+ if (rc < 0)
+ return rc;
- nsvc = gprs_ns_nsip_connect(sgsn_nsi, &dest, NSEI, nsvci);
- unsigned i = 0;
while (1)
{
osmo_gsm_timers_check();
@@ -87,11 +117,10 @@ int main(int argc, char *argv[])
osmo_gsm_timers_update();
osmo_select_main(0);
- if (i == 7)
- {
- bssgp_tx_bvc_reset(bctx, BVCI, cause);
- }
- i++;
}
-}
+ pcu_l1if_close();
+ talloc_free(gprs_rlcmac_bts);
+
+ return 0;
+}
diff --git a/src/pcuif_proto.h b/src/pcuif_proto.h
new file mode 100644
index 0000000..3609f79
--- /dev/null
+++ b/src/pcuif_proto.h
@@ -0,0 +1,137 @@
+#ifndef _PCUIF_PROTO_H
+#define _PCUIF_PROTO_H
+
+/* msg_type */
+#define PCU_IF_MSG_DATA_REQ 0x00 /* send data to given channel */
+#define PCU_IF_MSG_DATA_IND 0x02 /* receive data from given channel */
+#define PCU_IF_MSG_RTS_REQ 0x10 /* ready to send data to given chan. */
+#define PCU_IF_MSG_RACH_IND 0x22 /* receive rach */
+#define PCU_IF_MSG_INFO_IND 0x32 /* retrieve BTS info */
+#define PCU_IF_MSG_ACT_REQ 0x40 /* activate/deactivate PDCH */
+#define PCU_IF_MSG_TIME_IND 0x52 /* gsm time indication */
+
+/* sapi */
+#define PCU_IF_SAPI_RACH 0x01 /* channel request on CCCH */
+#define PCU_IF_SAPI_AGCH 0x02 /* assignment on CCCH */
+#define PCU_IF_SAPI_PCH 0x03 /* paging request on CCCH */
+#define PCU_IF_SAPI_BCCH 0x04 /* SI on BCCH */
+#define PCU_IF_SAPI_PDTCH 0x05 /* packet data/control/ccch block */
+#define PCU_IF_SAPI_PRACH 0x06 /* packet random access channel */
+#define PCU_IF_SAPI_PTCCH 0x07 /* packet TA control channel */
+
+/* flags */
+#define PCU_IF_FLAG_ACTIVE (1 << 0)/* BTS is active */
+#define PCU_IF_FLAG_SYSMO (1 << 1)/* access PDCH of sysmoBTS directly */
+#define PCU_IF_FLAG_CS1 (1 << 16)
+#define PCU_IF_FLAG_CS2 (1 << 17)
+#define PCU_IF_FLAG_CS3 (1 << 18)
+#define PCU_IF_FLAG_CS4 (1 << 19)
+#define PCU_IF_FLAG_MCS1 (1 << 20)
+#define PCU_IF_FLAG_MCS2 (1 << 21)
+#define PCU_IF_FLAG_MCS3 (1 << 22)
+#define PCU_IF_FLAG_MCS4 (1 << 23)
+#define PCU_IF_FLAG_MCS5 (1 << 24)
+#define PCU_IF_FLAG_MCS6 (1 << 25)
+#define PCU_IF_FLAG_MCS7 (1 << 26)
+#define PCU_IF_FLAG_MCS8 (1 << 27)
+#define PCU_IF_FLAG_MCS9 (1 << 28)
+
+struct gsm_pcu_if_data {
+ uint8_t sapi;
+ uint8_t len;
+ uint8_t data[162];
+ uint32_t fn;
+ uint16_t arfcn;
+ uint8_t trx_nr;
+ uint8_t ts_nr;
+ uint8_t block_nr;
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_rts_req {
+ uint8_t sapi;
+ uint8_t spare[3];
+ uint32_t fn;
+ uint16_t arfcn;
+ uint8_t trx_nr;
+ uint8_t ts_nr;
+ uint8_t block_nr;
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_rach_ind {
+ uint8_t sapi;
+ uint8_t ra;
+ int16_t qta;
+ uint32_t fn;
+ uint16_t arfcn;
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_info_trx {
+ uint16_t arfcn;
+ uint8_t pdch_mask; /* PDCH channels per TS */
+ uint8_t spare;
+ uint8_t tsc[8]; /* TSC per channel */
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_info_ind {
+ uint32_t flags;
+ struct gsm_pcu_if_info_trx trx[8]; /* TRX infos per BTS */
+ /* RAI */
+ uint16_t mcc, mnc, lac, rac;
+ /* NSE */
+ uint16_t nsei;
+ uint8_t nse_timer[7];
+ uint8_t cell_timer[11];
+ /* cell */
+ uint16_t cell_id;
+ uint16_t repeat_time;
+ uint8_t repeat_count;
+ uint16_t bvci;
+ uint8_t t3142;
+ uint8_t t3169;
+ uint8_t t3191;
+ uint8_t t3193_10ms;
+ uint8_t t3195;
+ uint8_t n3101;
+ uint8_t n3103;
+ uint8_t n3105;
+ uint8_t cv_countdown;
+ uint16_t dl_tbf_ext;
+ uint16_t ul_tbf_ext;
+ uint8_t initial_cs;
+ uint8_t initial_mcs;
+ /* NSVC */
+ uint16_t nsvci[2];
+ uint16_t local_port[2];
+ uint16_t remote_port[2];
+ uint32_t remote_ip[2];
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_act_req {
+ uint8_t activate;
+ uint8_t trx_nr;
+ uint8_t ts_nr;
+ uint8_t spare;
+} __attribute__ ((packed));
+
+struct gsm_pcu_if_time_ind {
+ uint32_t fn;
+} __attribute__ ((packed));
+
+struct gsm_pcu_if {
+ /* context based information */
+ uint8_t msg_type; /* message type */
+ uint8_t bts_nr; /* bts number */
+ uint8_t spare[2];
+
+ union {
+ struct gsm_pcu_if_data data_req;
+ struct gsm_pcu_if_data data_ind;
+ struct gsm_pcu_if_rts_req rts_req;
+ struct gsm_pcu_if_rach_ind rach_ind;
+ struct gsm_pcu_if_info_ind info_ind;
+ struct gsm_pcu_if_act_req act_req;
+ struct gsm_pcu_if_time_ind time_ind;
+ } u;
+} __attribute__ ((packed));
+
+#endif /* _PCUIF_PROTO_H */
diff --git a/src/sysmo_l1_if.cpp b/src/sysmo_l1_if.cpp
deleted file mode 100644
index 09a3149..0000000
--- a/src/sysmo_l1_if.cpp
+++ /dev/null
@@ -1,562 +0,0 @@
-/* sysmo_l1_if.cpp
- *
- * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <assert.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-extern "C" {
-#include <osmocom/core/talloc.h>
-#include <osmocom/core/select.h>
-#include <osmocom/core/msgb.h>
-}
-
-#include <gprs_rlcmac.h>
-#include <pcu_l1_if.h>
-#include <gprs_debug.h>
-#include "../../osmo-bts/include/osmo-bts/pcuif_proto.h"
-
-static int pcu_sock_send(struct msgb *msg);
-static void pcu_sock_timeout(void *_priv);
-
-struct pcu_l1if_bts pcu_l1if_bts;
-
-// Variable for storage current FN.
-int frame_number;
-
-int get_current_fn()
-{
- return frame_number;
-}
-
-void set_current_fn(int fn)
-{
- frame_number = fn;
-}
-
-/*
- * PCU messages
- */
-
-struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr)
-{
- struct msgb *msg;
- struct gsm_pcu_if *pcu_prim;
-
- msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx");
- if (!msg)
- return NULL;
- msgb_put(msg, sizeof(struct gsm_pcu_if));
- pcu_prim = (struct gsm_pcu_if *) msg->data;
- pcu_prim->msg_type = msg_type;
- pcu_prim->bts_nr = bts_nr;
-
- return msg;
-}
-
-static int pcu_tx_act_req(uint8_t trx, uint8_t ts, uint8_t activate)
-{
- struct msgb *msg;
- struct gsm_pcu_if *pcu_prim;
- struct gsm_pcu_if_act_req *act_req;
-
- LOGP(DL1IF, LOGL_INFO, "Sending %s request: trx=%d ts=%d\n",
- (activate) ? "activate" : "deactivate", trx, ts);
-
- msg = pcu_msgb_alloc(PCU_IF_MSG_ACT_REQ, 0);
- if (!msg)
- return -ENOMEM;
- pcu_prim = (struct gsm_pcu_if *) msg->data;
- act_req = &pcu_prim->u.act_req;
- act_req->activate = activate;
- act_req->trx_nr = trx;
- act_req->ts_nr = ts;
-
- return pcu_sock_send(msg);
-}
-
-static int pcu_tx_data_req(uint8_t trx, uint8_t ts, uint8_t sapi,
- uint16_t arfcn, uint32_t fn, uint8_t block_nr, uint8_t *data,
- uint8_t len)
-{
- struct msgb *msg;
- struct gsm_pcu_if *pcu_prim;
- struct gsm_pcu_if_data *data_req;
-
- LOGP(DL1IF, LOGL_DEBUG, "Sending data request: trx=%d ts=%d sapi=%d "
- "arfcn=%d fn=%d block=%d data=%s\n", trx, ts, sapi, arfcn, fn,
- block_nr, osmo_hexdump(data, len));
-
- msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_REQ, 0);
- if (!msg)
- return -ENOMEM;
- pcu_prim = (struct gsm_pcu_if *) msg->data;
- data_req = &pcu_prim->u.data_req;
-
- data_req->sapi = sapi;
- data_req->fn = fn;
- data_req->arfcn = arfcn;
- data_req->trx_nr = trx;
- data_req->ts_nr = ts;
- data_req->block_nr = block_nr;
- memcpy(data_req->data, data, len);
- data_req->len = len;
-
- return pcu_sock_send(msg);
-}
-
-void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
- uint32_t fn, uint8_t block_nr)
-{
- pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PDTCH, arfcn, fn, block_nr,
- msg->data, msg->len);
- msgb_free(msg);
-}
-
-void pcu_l1if_tx_ptcch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn,
- uint32_t fn, uint8_t block_nr)
-{
- pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PTCCH, arfcn, fn, block_nr,
- msg->data, msg->len);
- msgb_free(msg);
-}
-
-void pcu_l1if_tx_agch(bitvec * block, int len)
-{
- uint8_t data[24]; /* prefix PLEN */
-
- /* FIXME: why does OpenBTS has no PLEN and no fill in message? */
- bitvec_pack(block, data + 1);
- data[0] = (len << 2) | 0x01;
- pcu_tx_data_req(0, 0, PCU_IF_SAPI_AGCH, 0, 0, 0, data, 23);
-}
-
-static void pcu_l1if_tx_bcch(uint8_t *data, int len)
-{
- pcu_tx_data_req(0, 0, PCU_IF_SAPI_BCCH, 0, 0, 0, data, len);
-}
-
-static int pcu_rx_data_ind(struct gsm_pcu_if_data *data_ind)
-{
- int rc = 0;
- bitvec *block;
-
- LOGP(DL1IF, LOGL_DEBUG, "Data indication received: sapi=%d arfcn=%d "
- "block=%d data=%s\n", data_ind->sapi,
- data_ind->arfcn, data_ind->block_nr,
- osmo_hexdump(data_ind->data, data_ind->len));
-
- switch (data_ind->sapi) {
- case PCU_IF_SAPI_PDTCH:
- block = bitvec_alloc(data_ind->len);
- if (!block) {
- rc = -ENOMEM;
- break;
- }
- bitvec_unpack(block, data_ind->data);
- gprs_rlcmac_rcv_block(block);
- bitvec_free(block);
- break;
- default:
- LOGP(DL1IF, LOGL_ERROR, "Received PCU data indication with "
- "unsupported sapi %d\n", data_ind->sapi);
- rc = -EINVAL;
- }
-
- return rc;
-}
-
-static int pcu_rx_rts_req(struct gsm_pcu_if_rts_req *rts_req)
-{
- int rc = 0;
-
- LOGP(DL1IF, LOGL_DEBUG, "RTS request received: trx=%d ts=%d sapi=%d "
- "arfcn=%d fn=%d block=%d\n", rts_req->trx_nr, rts_req->ts_nr,
- rts_req->sapi, rts_req->arfcn, rts_req->fn, rts_req->block_nr);
-
- switch (rts_req->sapi) {
- case PCU_IF_SAPI_PDTCH:
- gprs_rlcmac_rcv_rts_block(rts_req->trx_nr, rts_req->ts_nr,
- rts_req->arfcn, rts_req->fn, rts_req->block_nr);
- break;
- case PCU_IF_SAPI_PTCCH:
- /* FIXME */
- {
- struct msgb *msg = msgb_alloc(23, "l1_prim");
- memset(msgb_put(msg, 23), 0x2b, 23);
- pcu_l1if_tx_ptcch(msg, rts_req->trx_nr, rts_req->ts_nr,
- rts_req->arfcn, rts_req->fn, rts_req->block_nr);
- }
- break;
- default:
- LOGP(DL1IF, LOGL_ERROR, "Received PCU RTS request with "
- "unsupported sapi %d\n", rts_req->sapi);
- rc = -EINVAL;
- }
-
- return rc;
-}
-
-static int pcu_rx_rach_ind(struct gsm_pcu_if_rach_ind *rach_ind)
-{
- int rc = 0;
-
- LOGP(DL1IF, LOGL_INFO, "RACH request received: sapi=%d "
- "qta=%d, ra=%d, fn=%d\n", rach_ind->sapi, rach_ind->qta,
- rach_ind->ra, rach_ind->fn);
-
- switch (rach_ind->sapi) {
- case PCU_IF_SAPI_RACH:
- rc = gprs_rlcmac_rcv_rach(rach_ind->ra, rach_ind->fn,
- rach_ind->qta);
- break;
- default:
- LOGP(DL1IF, LOGL_ERROR, "Received PCU rach request with "
- "unsupported sapi %d\n", rach_ind->sapi);
- rc = -EINVAL;
- }
-
- return rc;
-}
-
-static int pcu_rx_info_ind(struct gsm_pcu_if_info_ind *info_ind)
-{
- int rc = 0;
- int trx, ts;
-// uint8_t si13[23];
-
- LOGP(DL1IF, LOGL_INFO, "Info indication received:\n");
-
- if (!(info_ind->flags & PCU_IF_FLAG_ACTIVE)) {
- LOGP(DL1IF, LOGL_NOTICE, "BTS not available\n");
- return 0;
- }
- LOGP(DL1IF, LOGL_INFO, "BTS available\n");
-
- for (trx = 0; trx < 8; trx++) {
- pcu_l1if_bts.trx[trx].arfcn = info_ind->trx[trx].arfcn;
- for (ts = 0; ts < 8; ts++) {
- if ((info_ind->trx[trx].pdch_mask & (1 << ts))) {
- /* FIXME: activate dynamically at RLCMAC */
- if (!pcu_l1if_bts.trx[trx].ts[ts].enable)
- pcu_tx_act_req(trx, ts, 1);
- pcu_l1if_bts.trx[trx].ts[ts].enable = 1;
- pcu_l1if_bts.trx[trx].ts[ts].tsc =
- info_ind->trx[trx].tsc[ts];
- LOGP(DL1IF, LOGL_INFO, "PDCH: trx=%d ts=%d\n",
- trx, ts);
- } else {
- if (pcu_l1if_bts.trx[trx].ts[ts].enable)
- pcu_tx_act_req(trx, ts, 0);
- pcu_l1if_bts.trx[trx].ts[ts].enable = 0;
- }
- }
- }
-
-#warning FIXME: RAC
-// rc = generate_si13(si13, 0 /* rac */);
-// printf("rc=%d\n", rc);
-// pcu_l1if_tx_bcch(si13, 23);
-
- return rc;
-}
-
-static int pcu_rx(uint8_t msg_type, struct gsm_pcu_if *pcu_prim)
-{
- int rc = 0;
-
- switch (msg_type) {
- case PCU_IF_MSG_DATA_IND:
- rc = pcu_rx_data_ind(&pcu_prim->u.data_ind);
- break;
- case PCU_IF_MSG_RTS_REQ:
- rc = pcu_rx_rts_req(&pcu_prim->u.rts_req);
- break;
- case PCU_IF_MSG_RACH_IND:
- rc = pcu_rx_rach_ind(&pcu_prim->u.rach_ind);
- break;
- case PCU_IF_MSG_INFO_IND:
- rc = pcu_rx_info_ind(&pcu_prim->u.info_ind);
- break;
- default:
- LOGP(DL1IF, LOGL_ERROR, "Received unknwon PCU msg type %d\n",
- msg_type);
- rc = -EINVAL;
- }
-
- return rc;
-}
-
-/*
- * SYSMO-PCU socket functions
- */
-
-struct pcu_sock_state {
- struct osmo_fd conn_bfd; /* fd for connection to lcr */
- struct osmo_timer_list timer; /* socket connect retry timer */
- struct llist_head upqueue; /* queue for sending messages */
-} *pcu_sock_state = NULL;
-
-static int pcu_sock_send(struct msgb *msg)
-{
- struct pcu_sock_state *state = pcu_sock_state;
- struct osmo_fd *conn_bfd;
-
- if (!state) {
- LOGP(DL1IF, LOGL_NOTICE, "PCU socket not created, dropping "
- "message\n");
- return -EINVAL;
- }
- conn_bfd = &state->conn_bfd;
- if (conn_bfd->fd <= 0) {
- LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping "
- "message\n");
- return -EIO;
- }
- msgb_enqueue(&state->upqueue, msg);
- conn_bfd->when |= BSC_FD_WRITE;
-
- return 0;
-}
-
-static void pcu_sock_close(struct pcu_sock_state *state)
-{
- struct osmo_fd *bfd = &state->conn_bfd;
-
- LOGP(DL1IF, LOGL_NOTICE, "PCU socket has LOST connection\n");
-
- close(bfd->fd);
- bfd->fd = -1;
- osmo_fd_unregister(bfd);
-
- /* flush the queue */
- while (!llist_empty(&state->upqueue)) {
- struct msgb *msg = msgb_dequeue(&state->upqueue);
- msgb_free(msg);
- }
-
- /* disable all slots */
- memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts));
-
- state->timer.cb = pcu_sock_timeout;
- osmo_timer_schedule(&state->timer, 5, 0);
-}
-
-static int pcu_sock_read(struct osmo_fd *bfd)
-{
- struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
- struct gsm_pcu_if *pcu_prim;
- struct msgb *msg;
- int rc;
-
- msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx");
- if (!msg)
- return -ENOMEM;
-
- pcu_prim = (struct gsm_pcu_if *) msg->tail;
-
- rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0);
- if (rc == 0)
- goto close;
-
- if (rc < 0) {
- if (errno == EAGAIN)
- return 0;
- goto close;
- }
-
- rc = pcu_rx(pcu_prim->msg_type, pcu_prim);
-
- /* as we always synchronously process the message in pcu_rx() and
- * its callbacks, we can free the message here. */
- msgb_free(msg);
-
- return rc;
-
-close:
- msgb_free(msg);
- pcu_sock_close(state);
- return -1;
-}
-
-static int pcu_sock_write(struct osmo_fd *bfd)
-{
- struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
- int rc;
-
- while (!llist_empty(&state->upqueue)) {
- struct msgb *msg, *msg2;
- struct gsm_pcu_if *pcu_prim;
-
- /* peek at the beginning of the queue */
- msg = llist_entry(state->upqueue.next, struct msgb, list);
- pcu_prim = (struct gsm_pcu_if *)msg->data;
-
- bfd->when &= ~BSC_FD_WRITE;
-
- /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
- if (!msgb_length(msg)) {
- LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO "
- "bytes!\n", pcu_prim->msg_type);
- goto dontsend;
- }
-
- /* try to send it over the socket */
- rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
- if (rc == 0)
- goto close;
- if (rc < 0) {
- if (errno == EAGAIN) {
- bfd->when |= BSC_FD_WRITE;
- break;
- }
- goto close;
- }
-
-dontsend:
- /* _after_ we send it, we can deueue */
- msg2 = msgb_dequeue(&state->upqueue);
- assert(msg == msg2);
- msgb_free(msg);
- }
- return 0;
-
-close:
- pcu_sock_close(state);
-
- return -1;
-}
-
-static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
-{
- int rc = 0;
-
- if (flags & BSC_FD_READ)
- rc = pcu_sock_read(bfd);
- if (rc < 0)
- return rc;
-
- if (flags & BSC_FD_WRITE)
- rc = pcu_sock_write(bfd);
-
- return rc;
-}
-
-int pcu_l1if_open(void)
-{
- struct pcu_sock_state *state;
- struct osmo_fd *bfd;
- struct sockaddr_un local;
- unsigned int namelen;
- int rc;
-
- memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts));
-
- state = pcu_sock_state;
- if (!state) {
- state = talloc_zero(NULL, struct pcu_sock_state);
- if (!state)
- return -ENOMEM;
- INIT_LLIST_HEAD(&state->upqueue);
- }
-
- bfd = &state->conn_bfd;
-
- bfd->fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
- if (bfd->fd < 0) {
- LOGP(DL1IF, LOGL_ERROR, "Failed to create PCU-SYSMO socket.\n");
- talloc_free(state);
- return -1;
- }
-
- local.sun_family = AF_UNIX;
- strncpy(local.sun_path, "/tmp/pcu_bts", sizeof(local.sun_path));
- local.sun_path[sizeof(local.sun_path) - 1] = '\0';
-
- /* we use the same magic that X11 uses in Xtranssock.c for
- * calculating the proper length of the sockaddr */
-#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
- local.sun_len = strlen(local.sun_path);
-#endif
-#if defined(BSD44SOCKETS) || defined(SUN_LEN)
- namelen = SUN_LEN(&local);
-#else
- namelen = strlen(local.sun_path) +
- offsetof(struct sockaddr_un, sun_path);
-#endif
- rc = connect(bfd->fd, (struct sockaddr *) &local, namelen);
- if (rc != 0) {
- LOGP(DL1IF, LOGL_ERROR, "Failed to Connect the PCU-SYSMO "
- "socket, delaying... '%s'\n", local.sun_path);
- close(bfd->fd);
- bfd->fd = -1;
- state->timer.cb = pcu_sock_timeout;
- osmo_timer_schedule(&state->timer, 5, 0);
- return -1;
- }
-
- bfd->when = BSC_FD_READ;
- bfd->cb = pcu_sock_cb;
- bfd->data = state;
-
- rc = osmo_fd_register(bfd);
- if (rc < 0) {
- LOGP(DL1IF, LOGL_ERROR, "Could not register PCU fd: %d\n", rc);
- close(bfd->fd);
- talloc_free(state);
- return rc;
- }
-
- LOGP(DL1IF, LOGL_NOTICE, "PCU-SYSMO socket has been connected\n");
-
- pcu_sock_state = state;
-
- return 0;
-}
-
-void pcu_l1if_close(void)
-{
- struct pcu_sock_state *state = pcu_sock_state;
- struct osmo_fd *bfd;
-
- if (!state)
- return;
-
- if (osmo_timer_pending(&state->timer))
- osmo_timer_del(&state->timer);
-
- bfd = &state->conn_bfd;
- if (bfd->fd > 0)
- pcu_sock_close(state);
- talloc_free(state);
- pcu_sock_state = NULL;
-}
-
-static void pcu_sock_timeout(void *_priv)
-{
- pcu_l1if_open();
-}
-
-
-
-
diff --git a/src/sysmo_sock.cpp b/src/sysmo_sock.cpp
new file mode 100644
index 0000000..8d83ca2
--- /dev/null
+++ b/src/sysmo_sock.cpp
@@ -0,0 +1,303 @@
+/* sysmo_sock.cpp
+ *
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+extern "C" {
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/msgb.h>
+}
+
+#include <gprs_rlcmac.h>
+#include <pcu_l1_if.h>
+#include <gprs_debug.h>
+#include <gprs_bssgp_pcu.h>
+#include <pcuif_proto.h>
+
+
+/*
+ * SYSMO-PCU socket functions
+ */
+
+struct pcu_sock_state {
+ struct osmo_fd conn_bfd; /* fd for connection to lcr */
+ struct osmo_timer_list timer; /* socket connect retry timer */
+ struct llist_head upqueue; /* queue for sending messages */
+} *pcu_sock_state = NULL;
+
+static void pcu_sock_timeout(void *_priv);
+
+int pcu_sock_send(struct msgb *msg)
+{
+ struct pcu_sock_state *state = pcu_sock_state;
+ struct osmo_fd *conn_bfd;
+
+ if (!state) {
+ LOGP(DL1IF, LOGL_NOTICE, "PCU socket not created, dropping "
+ "message\n");
+ return -EINVAL;
+ }
+ conn_bfd = &state->conn_bfd;
+ if (conn_bfd->fd <= 0) {
+ LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping "
+ "message\n");
+ return -EIO;
+ }
+ msgb_enqueue(&state->upqueue, msg);
+ conn_bfd->when |= BSC_FD_WRITE;
+
+ return 0;
+}
+
+static void pcu_sock_close(struct pcu_sock_state *state)
+{
+ struct osmo_fd *bfd = &state->conn_bfd;
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct gprs_rlcmac_tbf *tbf;
+ uint8_t trx, ts, tfi;
+
+ LOGP(DL1IF, LOGL_NOTICE, "PCU socket has LOST connection\n");
+
+ close(bfd->fd);
+ bfd->fd = -1;
+ osmo_fd_unregister(bfd);
+
+ /* flush the queue */
+ while (!llist_empty(&state->upqueue)) {
+ struct msgb *msg = msgb_dequeue(&state->upqueue);
+ msgb_free(msg);
+ }
+
+ /* disable all slots, kick all TBFs */
+ for (trx = 0; trx < 8; trx++) {
+ for (ts = 0; ts < 8; ts++) {
+ bts->trx[trx].pdch[ts].enable = 0;
+ for (tfi = 0; tfi < 32; tfi++) {
+ tbf = bts->trx[trx].pdch[ts].tbf[tfi];
+ if (tbf)
+ tbf_free(tbf);
+ }
+ }
+ }
+
+ gprs_bssgp_destroy();
+
+ state->timer.cb = pcu_sock_timeout;
+ osmo_timer_schedule(&state->timer, 5, 0);
+}
+
+static int pcu_sock_read(struct osmo_fd *bfd)
+{
+ struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
+ struct gsm_pcu_if *pcu_prim;
+ struct msgb *msg;
+ int rc;
+
+ msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx");
+ if (!msg)
+ return -ENOMEM;
+
+ pcu_prim = (struct gsm_pcu_if *) msg->tail;
+
+ rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0);
+ if (rc == 0)
+ goto close;
+
+ if (rc < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ goto close;
+ }
+
+ rc = pcu_rx(pcu_prim->msg_type, pcu_prim);
+
+ /* as we always synchronously process the message in pcu_rx() and
+ * its callbacks, we can free the message here. */
+ msgb_free(msg);
+
+ return rc;
+
+close:
+ msgb_free(msg);
+ pcu_sock_close(state);
+ return -1;
+}
+
+static int pcu_sock_write(struct osmo_fd *bfd)
+{
+ struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
+ int rc;
+
+ while (!llist_empty(&state->upqueue)) {
+ struct msgb *msg, *msg2;
+ struct gsm_pcu_if *pcu_prim;
+
+ /* peek at the beginning of the queue */
+ msg = llist_entry(state->upqueue.next, struct msgb, list);
+ pcu_prim = (struct gsm_pcu_if *)msg->data;
+
+ bfd->when &= ~BSC_FD_WRITE;
+
+ /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
+ if (!msgb_length(msg)) {
+ LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO "
+ "bytes!\n", pcu_prim->msg_type);
+ goto dontsend;
+ }
+
+ /* try to send it over the socket */
+ rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
+ if (rc == 0)
+ goto close;
+ if (rc < 0) {
+ if (errno == EAGAIN) {
+ bfd->when |= BSC_FD_WRITE;
+ break;
+ }
+ goto close;
+ }
+
+dontsend:
+ /* _after_ we send it, we can deueue */
+ msg2 = msgb_dequeue(&state->upqueue);
+ assert(msg == msg2);
+ msgb_free(msg);
+ }
+ return 0;
+
+close:
+ pcu_sock_close(state);
+
+ return -1;
+}
+
+static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
+{
+ int rc = 0;
+
+ if (flags & BSC_FD_READ)
+ rc = pcu_sock_read(bfd);
+ if (rc < 0)
+ return rc;
+
+ if (flags & BSC_FD_WRITE)
+ rc = pcu_sock_write(bfd);
+
+ return rc;
+}
+
+int pcu_l1if_open(void)
+{
+ struct pcu_sock_state *state;
+ struct osmo_fd *bfd;
+ struct sockaddr_un local;
+ unsigned int namelen;
+ int rc;
+
+ state = pcu_sock_state;
+ if (!state) {
+ state = talloc_zero(NULL, struct pcu_sock_state);
+ if (!state)
+ return -ENOMEM;
+ INIT_LLIST_HEAD(&state->upqueue);
+ }
+
+ bfd = &state->conn_bfd;
+
+ bfd->fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+ if (bfd->fd < 0) {
+ LOGP(DL1IF, LOGL_ERROR, "Failed to create PCU-SYSMO socket.\n");
+ talloc_free(state);
+ return -1;
+ }
+
+ local.sun_family = AF_UNIX;
+ strncpy(local.sun_path, "/tmp/pcu_bts", sizeof(local.sun_path));
+ local.sun_path[sizeof(local.sun_path) - 1] = '\0';
+
+ /* we use the same magic that X11 uses in Xtranssock.c for
+ * calculating the proper length of the sockaddr */
+#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
+ local.sun_len = strlen(local.sun_path);
+#endif
+#if defined(BSD44SOCKETS) || defined(SUN_LEN)
+ namelen = SUN_LEN(&local);
+#else
+ namelen = strlen(local.sun_path) +
+ offsetof(struct sockaddr_un, sun_path);
+#endif
+ rc = connect(bfd->fd, (struct sockaddr *) &local, namelen);
+ if (rc != 0) {
+ LOGP(DL1IF, LOGL_ERROR, "Failed to Connect the PCU-SYSMO "
+ "socket, delaying... '%s'\n", local.sun_path);
+ close(bfd->fd);
+ bfd->fd = -1;
+ state->timer.cb = pcu_sock_timeout;
+ osmo_timer_schedule(&state->timer, 5, 0);
+ return 0;
+ }
+
+ bfd->when = BSC_FD_READ;
+ bfd->cb = pcu_sock_cb;
+ bfd->data = state;
+
+ rc = osmo_fd_register(bfd);
+ if (rc < 0) {
+ LOGP(DL1IF, LOGL_ERROR, "Could not register PCU fd: %d\n", rc);
+ close(bfd->fd);
+ talloc_free(state);
+ return rc;
+ }
+
+ LOGP(DL1IF, LOGL_NOTICE, "PCU-SYSMO socket has been connected\n");
+
+ pcu_sock_state = state;
+
+ return 0;
+}
+
+void pcu_l1if_close(void)
+{
+ struct pcu_sock_state *state = pcu_sock_state;
+ struct osmo_fd *bfd;
+
+ if (!state)
+ return;
+
+ if (osmo_timer_pending(&state->timer))
+ osmo_timer_del(&state->timer);
+
+ bfd = &state->conn_bfd;
+ if (bfd->fd > 0)
+ pcu_sock_close(state);
+ talloc_free(state);
+ pcu_sock_state = NULL;
+}
+
+static void pcu_sock_timeout(void *_priv)
+{
+ pcu_l1if_open();
+}
diff --git a/src/tbf.txt b/src/tbf.txt
new file mode 100644
index 0000000..3c06b39
--- /dev/null
+++ b/src/tbf.txt
@@ -0,0 +1,111 @@
+This document describes the handling of TBFs
+--------------------------------------------
+
+Notes:
+ TBF
+ Instance for one temporary block flow.
+
+ LLC Frame
+ Current frame to be transmitted or received. If tbf->llc_length is not 0,
+ the frame exists, if 0, the frame does not exist. If tbf->llc_index is not
+ 0, parts of the frame have been transmitted or received so far.
+
+ LLC Queue
+ Queue of next frames to be transmitted.
+
+States:
+ GPRS_RLCMAC_ASSIGN
+ After a downlink TBF is created, it resides in this state until the
+ block flow can start. This is required to give the mobile time to listen
+ to connect to downlink PDCH.
+
+ GPRS_RLCMAC_FLOW,
+ During packet flow, this state indicates downlink and uplink TBF block
+ flow.
+
+ GPRS_RLCMAC_FINISHED,
+ Uplink TBF:
+ After final block is received AND all other blocks are completely
+ received, the state is entered. The PACKET CONTROL ACK is still not
+ received. (Counter N3103 is counted on each poll request.)
+ Downlink TBF:
+ All blocks including the final block has been transmitted. Not all
+ downlink blocks are acknowledged yet. (Counter N3015 is counted on each
+ poll request.)
+
+ GPRS_RLCMAC_WAIT_RELEASE,
+ The all blocks on downlink TBF have been acked by mobile. The penalty
+ timer T3192 is running on mobile.
+
+ GPRS_RLCMAC_RELEASING,
+ Wait for TFI/USF to be re-used. This state is entered when a counter
+ reaches it's maximum and T3169 is running.
+
+
+When downlink LLC PDU is received:
+
+ If downlink TBF exists for given TLLI, but not in RELEASING state:
+ If downlink TBF is in FLOW or FINISHED state:
+ Enqueue PDU to LLC Queue of TBF.
+ Done.
+ If downlink TBF is in WAIT RELEASE state:
+ Attach PDU to LLC Frame of TBF.
+ Put TBF back into FLOW state.
+ Done.
+ If dowlink TBF does not exists for given TLLI, or in RELEASING state:
+ Create new downlink TBF.
+ Attach PDU to LLC Frame of TBF.
+ If uplink TBF exists for given TLLI, but not in RELEASING state:
+ Assign packet channel PACCH.
+ Done.
+ If uplink TBF does not exists for given TLLI, or in RELEASING state:
+ Assign packet channel AGCH.
+ Done.
+
+When channel request for uplink TBF is received:
+
+ Create new uplink TBF.
+ If channel request was received on RACH
+ Assign packet channel AGCH.
+ Done
+ If channel request was received on PACCH
+ Assign packet channel PACCH.
+ Done
+
+Handling of LLC Frame of downlink TBF and LLC Queue of downlink TBF:
+
+ If a downlink TBF is created, the LLC PDU is attached to LLC Frame of TBF
+ (downlink flow is assigned to MS).
+
+ If a downlink TBF exists, the LLC PDU is enqueued to LLC Queue of TBF.
+
+ During transfer of downlink blocks, the LLC Queue is dequeued whenever all
+ segments of LLC Frame were used for generation of downlink blocks. (If a
+ block is partly filled with LLC Frame segment, its remaining space is filled
+ with the next LLC Frame from the Queue.)
+
+ If the transfer is finished, no more LLC Frames are dequeued from the LLC
+ Queue, in case a new frame has arrived during lifetime of TBF.
+
+ If the all downlink blocks have been acknowledged, the LLC Queue is
+ dequeued and an existing frame is attached to LLC Frame. If so, the new
+ state is FLOW (downlink flow is assigned to MS), otherwise WAIT RELEASE.
+
+ If a new LLC PDU is attached to LLC Frame during WAIT RELEASE state, the
+ state is changed to FLOW (downlink flow is assigned to MS).
+
+Handling of LLC Frame on uplink TBF:
+
+ Received uplink blocks are appended to LLC Frame of TBF. If the PDU is
+ complete, it is forwarded to the upper layer.
+
+Polling:
+ In order to poll uplink control block from MS, a special poll state and
+ frame number is stored at TBF. The scheduler reads that value and will not
+ assign uplink ressource for other TBFs at that frame number.
+
+ When there is no uplink transmission received on the block, a timeout is
+ indicated by layer 1 interface. There are two ways of checking timeout:
+ - The received frame is bad (BFI).
+ - The GSM indicates that the block should have been already received.
+