| /* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */ |
| |
| /* (C) 2009-2010 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, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <errno.h> |
| #include <stdint.h> |
| |
| #include <netinet/in.h> |
| |
| #include <osmocore/msgb.h> |
| #include <osmocore/tlv.h> |
| #include <osmocore/talloc.h> |
| |
| #include <openbsc/debug.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/gprs_bssgp.h> |
| #include <openbsc/gprs_ns.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 }, |
| }; |
| |
| const char *bssgp_cause_str(enum gprs_bssgp_cause cause) |
| { |
| return get_value_string(bssgp_cause_strings, cause); |
| } |
| |
| |
| struct msgb *bssgp_msgb_alloc(void) |
| { |
| return msgb_alloc_headroom(4096, 128, "BSSGP"); |
| } |
| |
| /* 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 = 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)); |
| |
| 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 = htons(*bvci); |
| msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci); |
| } |
| if (orig_msg) |
| 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); |
| } |