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/* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */
/* (C) 2009-2017 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <errno.h>
#include <stdint.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/byteswap.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gprs/gprs_bssgp.h>
#include <osmocom/gprs/gprs_ns.h>
#include "common_vty.h"
struct gprs_ns_inst *bssgp_nsi;
/* BSSGP Protocol specific, not implementation specific */
/* FIXME: This needs to go into libosmocore after finished */
/* Chapter 11.3.9 / Table 11.10: Cause coding */
static const struct value_string bssgp_cause_strings[] = {
{ BSSGP_CAUSE_PROC_OVERLOAD, "Processor overload" },
{ BSSGP_CAUSE_EQUIP_FAIL, "Equipment Failure" },
{ BSSGP_CAUSE_TRASIT_NET_FAIL, "Transit netowkr service failure" },
{ BSSGP_CAUSE_CAPA_GREATER_0KPBS,"Transmission capacity modified" },
{ BSSGP_CAUSE_UNKNOWN_MS, "Unknown MS" },
{ BSSGP_CAUSE_UNKNOWN_BVCI, "Unknown BVCI" },
{ BSSGP_CAUSE_CELL_TRAF_CONG, "Cell traffic congestion" },
{ BSSGP_CAUSE_SGSN_CONG, "SGSN congestion" },
{ BSSGP_CAUSE_OML_INTERV, "O&M intervention" },
{ BSSGP_CAUSE_BVCI_BLOCKED, "BVCI blocked" },
{ BSSGP_CAUSE_PFC_CREATE_FAIL, "PFC create failure" },
{ BSSGP_CAUSE_SEM_INCORR_PDU, "Semantically incorrect PDU" },
{ BSSGP_CAUSE_INV_MAND_INF, "Invalid mandatory information" },
{ BSSGP_CAUSE_MISSING_MAND_IE, "Missing mandatory IE" },
{ BSSGP_CAUSE_MISSING_COND_IE, "Missing conditional IE" },
{ BSSGP_CAUSE_UNEXP_COND_IE, "Unexpected conditional IE" },
{ BSSGP_CAUSE_COND_IE_ERR, "Conditional IE error" },
{ BSSGP_CAUSE_PDU_INCOMP_STATE, "PDU incompatible with protocol state" },
{ BSSGP_CAUSE_PROTO_ERR_UNSPEC, "Protocol error - unspecified" },
{ BSSGP_CAUSE_PDU_INCOMP_FEAT, "PDU not compatible with feature set" },
{ 0, NULL },
};
static const struct value_string bssgp_pdu_strings[] = {
{ BSSGP_PDUT_DL_UNITDATA, "DL-UNITDATA" },
{ BSSGP_PDUT_UL_UNITDATA, "UL-UNITDATA" },
{ BSSGP_PDUT_RA_CAPABILITY, "RA-CAPABILITY" },
{ BSSGP_PDUT_PTM_UNITDATA, "PTM-UNITDATA" },
{ BSSGP_PDUT_PAGING_PS, "PAGING-PS" },
{ BSSGP_PDUT_PAGING_CS, "PAGING-CS" },
{ BSSGP_PDUT_RA_CAPA_UDPATE, "RA-CAPABILITY-UPDATE" },
{ BSSGP_PDUT_RA_CAPA_UPDATE_ACK, "RA-CAPABILITY-UPDATE-ACK" },
{ BSSGP_PDUT_RADIO_STATUS, "RADIO-STATUS" },
{ BSSGP_PDUT_SUSPEND, "SUSPEND" },
{ BSSGP_PDUT_SUSPEND_ACK, "SUSPEND-ACK" },
{ BSSGP_PDUT_SUSPEND_NACK, "SUSPEND-NACK" },
{ BSSGP_PDUT_RESUME, "RESUME" },
{ BSSGP_PDUT_RESUME_ACK, "RESUME-ACK" },
{ BSSGP_PDUT_RESUME_NACK, "RESUME-NACK" },
{ BSSGP_PDUT_BVC_BLOCK, "BVC-BLOCK" },
{ BSSGP_PDUT_BVC_BLOCK_ACK, "BVC-BLOCK-ACK" },
{ BSSGP_PDUT_BVC_RESET, "BVC-RESET" },
{ BSSGP_PDUT_BVC_RESET_ACK, "BVC-RESET-ACK" },
{ BSSGP_PDUT_BVC_UNBLOCK, "BVC-UNBLOCK" },
{ BSSGP_PDUT_BVC_UNBLOCK_ACK, "BVC-UNBLOCK-ACK" },
{ BSSGP_PDUT_FLOW_CONTROL_BVC, "FLOW-CONTROL-BVC" },
{ BSSGP_PDUT_FLOW_CONTROL_BVC_ACK, "FLOW-CONTROL-BVC-ACK" },
{ BSSGP_PDUT_FLOW_CONTROL_MS, "FLOW-CONTROL-MS" },
{ BSSGP_PDUT_FLOW_CONTROL_MS_ACK, "FLOW-CONTROL-MS-ACK" },
{ BSSGP_PDUT_FLUSH_LL, "FLUSH-LL" },
{ BSSGP_PDUT_FLUSH_LL_ACK, "FLUSH-LL-ACK" },
{ BSSGP_PDUT_LLC_DISCARD, "LLC DISCARDED" },
{ BSSGP_PDUT_SGSN_INVOKE_TRACE, "SGSN-INVOKE-TRACE" },
{ BSSGP_PDUT_STATUS, "STATUS" },
{ BSSGP_PDUT_DOWNLOAD_BSS_PFC, "DOWNLOAD-BSS-PFC" },
{ BSSGP_PDUT_CREATE_BSS_PFC, "CREATE-BSS-PFC" },
{ BSSGP_PDUT_CREATE_BSS_PFC_ACK, "CREATE-BSS-PFC-ACK" },
{ BSSGP_PDUT_CREATE_BSS_PFC_NACK, "CREATE-BSS-PFC-NACK" },
{ BSSGP_PDUT_MODIFY_BSS_PFC, "MODIFY-BSS-PFC" },
{ BSSGP_PDUT_MODIFY_BSS_PFC_ACK, "MODIFY-BSS-PFC-ACK" },
{ BSSGP_PDUT_DELETE_BSS_PFC, "DELETE-BSS-PFC" },
{ BSSGP_PDUT_DELETE_BSS_PFC_ACK, "DELETE-BSS-PFC-ACK" },
{ 0, NULL },
};
const char *bssgp_cause_str(enum gprs_bssgp_cause cause)
{
return get_value_string(bssgp_cause_strings, cause);
}
const char *bssgp_pdu_str(enum bssgp_pdu_type pdu)
{
return get_value_string(bssgp_pdu_strings, pdu);
}
struct msgb *bssgp_msgb_alloc(void)
{
struct msgb *msg = msgb_alloc_headroom(4096, 128, "BSSGP");
/* TODO: Add handling of msg == NULL to this function and to all callers */
OSMO_ASSERT(msg != NULL);
msgb_bssgph(msg) = msg->data;
return msg;
}
struct msgb *bssgp_msgb_copy(const struct msgb *msg, const char *name)
{
struct libgb_msgb_cb *old_cb, *new_cb;
struct msgb *new_msg;
new_msg = msgb_copy(msg, name);
if (!new_msg)
return NULL;
/* copy GB specific data */
old_cb = LIBGB_MSGB_CB(msg);
new_cb = LIBGB_MSGB_CB(new_msg);
if (old_cb->bssgph)
new_cb->bssgph = new_msg->_data + (old_cb->bssgph - msg->_data);
if (old_cb->llch)
new_cb->llch = new_msg->_data + (old_cb->llch - msg->_data);
/* bssgp_cell_id is a pointer into the old msgb, so we need to make
* it a pointer into the new msgb */
if (old_cb->bssgp_cell_id)
new_cb->bssgp_cell_id = new_msg->_data +
(old_cb->bssgp_cell_id - msg->_data);
new_cb->nsei = old_cb->nsei;
new_cb->bvci = old_cb->bvci;
new_cb->tlli = old_cb->tlli;
return new_msg;
}
/* Transmit a simple response such as BLOCK/UNBLOCK/RESET ACK/NACK */
int bssgp_tx_simple_bvci(uint8_t pdu_type, uint16_t nsei,
uint16_t bvci, uint16_t ns_bvci)
{
struct msgb *msg = bssgp_msgb_alloc();
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
uint16_t _bvci;
msgb_nsei(msg) = nsei;
msgb_bvci(msg) = ns_bvci;
bgph->pdu_type = pdu_type;
_bvci = osmo_htons(bvci);
msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci);
return gprs_ns_sendmsg(bssgp_nsi, msg);
}
/* Chapter 10.4.14: Status */
int bssgp_tx_status(uint8_t cause, uint16_t *bvci, struct msgb *orig_msg)
{
struct msgb *msg = bssgp_msgb_alloc();
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
/* GSM 08.18, 10.4.14.1: The BVCI must be included if (and only if) the
cause is either "BVCI blocked" or "BVCI unknown" */
if (cause == BSSGP_CAUSE_UNKNOWN_BVCI || cause == BSSGP_CAUSE_BVCI_BLOCKED) {
if (bvci == NULL)
LOGP(DBSSGP, LOGL_ERROR, "BSSGP Tx STATUS, cause=%s: "
"missing conditional BVCI\n",
bssgp_cause_str(cause));
} else {
if (bvci != NULL)
LOGP(DBSSGP, LOGL_ERROR, "BSSGP Tx STATUS, cause=%s: "
"unexpected conditional BVCI\n",
bssgp_cause_str(cause));
}
LOGP(DBSSGP, LOGL_NOTICE, "BSSGP BVCI=%u Tx STATUS, cause=%s\n",
bvci ? *bvci : 0, bssgp_cause_str(cause));
msgb_nsei(msg) = msgb_nsei(orig_msg);
msgb_bvci(msg) = 0;
bgph->pdu_type = BSSGP_PDUT_STATUS;
msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause);
if (bvci) {
uint16_t _bvci = osmo_htons(*bvci);
msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci);
}
msgb_tvlv_put(msg, BSSGP_IE_PDU_IN_ERROR,
msgb_bssgp_len(orig_msg), msgb_bssgph(orig_msg));
return gprs_ns_sendmsg(bssgp_nsi, msg);
}
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