/* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */ /* (C) 2009-2012 by Harald Welte * * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #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 }, }; const char *bssgp_cause_str(enum gprs_bssgp_cause cause) { return get_value_string(bssgp_cause_strings, cause); } struct msgb *bssgp_msgb_alloc(void) { struct msgb *msg = msgb_alloc_headroom(4096, 128, "BSSGP"); msgb_bssgph(msg) = msg->data; return 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 = 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 = 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); }