/*! \file gprs_bssgp_util.c * GPRS BSSGP protocol implementation as per 3GPP TS 08.18. */ /* * (C) 2009-2017 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 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 . * */ #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 }, }; 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); }