547 lines
15 KiB
C
547 lines
15 KiB
C
/* hnb-gw specific code for RUA (Ranap User Adaption) */
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/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "config.h"
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/netif/stream.h>
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#include <osmocom/sigtran/sccp_sap.h>
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "asn1helpers.h"
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#include <osmocom/hnbgw/hnbgw.h>
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#include <osmocom/hnbgw/hnbgw_ranap.h>
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#include <osmocom/rua/rua_common.h>
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#include <osmocom/rua/rua_ies_defs.h>
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#include <osmocom/hnbgw/context_map.h>
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#include <osmocom/hnbap/HNBAP_CN-DomainIndicator.h>
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static const char *cn_domain_indicator_to_str(RUA_CN_DomainIndicator_t cN_DomainIndicator)
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{
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switch (cN_DomainIndicator) {
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case RUA_CN_DomainIndicator_cs_domain:
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return "IuCS";
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case RUA_CN_DomainIndicator_ps_domain:
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return "IuPS";
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default:
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return "(unknown-domain)";
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}
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}
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static int hnbgw_rua_tx(struct hnb_context *ctx, struct msgb *msg)
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{
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if (!msg)
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return -EINVAL;
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if (!ctx || !ctx->conn) {
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LOGHNB(ctx, DRUA, LOGL_ERROR, "RUA context to this HNB is not connected, cannot transmit message\n");
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return -ENOTCONN;
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}
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msgb_sctp_ppid(msg) = IUH_PPI_RUA;
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osmo_stream_srv_send(ctx->conn, msg);
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return 0;
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}
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int rua_tx_udt(struct hnb_context *hnb, const uint8_t *data, unsigned int len)
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{
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RUA_ConnectionlessTransfer_t out;
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RUA_ConnectionlessTransferIEs_t ies;
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struct msgb *msg;
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int rc;
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memset(&ies, 0, sizeof(ies));
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ies.ranaP_Message.buf = (uint8_t *) data;
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ies.ranaP_Message.size = len;
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/* FIXME: msgb_free(msg)? ownership not yet clear */
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memset(&out, 0, sizeof(out));
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rc = rua_encode_connectionlesstransferies(&out, &ies);
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if (rc < 0)
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return rc;
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msg = rua_generate_initiating_message(RUA_ProcedureCode_id_ConnectionlessTransfer,
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RUA_Criticality_reject,
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&asn_DEF_RUA_ConnectionlessTransfer,
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&out);
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_ConnectionlessTransfer, &out);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "transmitting RUA payload of %u bytes\n", msgb_length(msg));
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return hnbgw_rua_tx(hnb, msg);
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}
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int rua_tx_dt(struct hnb_context *hnb, int is_ps, uint32_t context_id,
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const uint8_t *data, unsigned int len)
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{
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RUA_DirectTransfer_t out;
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RUA_DirectTransferIEs_t ies;
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uint32_t ctxidbuf;
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struct msgb *msg;
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int rc;
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memset(&ies, 0, sizeof(ies));
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if (is_ps)
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ies.cN_DomainIndicator = RUA_CN_DomainIndicator_ps_domain;
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else
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ies.cN_DomainIndicator = RUA_CN_DomainIndicator_cs_domain;
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asn1_u24_to_bitstring(&ies.context_ID, &ctxidbuf, context_id);
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ies.ranaP_Message.buf = (uint8_t *) data;
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ies.ranaP_Message.size = len;
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/* FIXME: msgb_free(msg)? ownership not yet clear */
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memset(&out, 0, sizeof(out));
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rc = rua_encode_directtransferies(&out, &ies);
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if (rc < 0)
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return rc;
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msg = rua_generate_initiating_message(RUA_ProcedureCode_id_DirectTransfer,
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RUA_Criticality_reject,
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&asn_DEF_RUA_DirectTransfer,
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&out);
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_DirectTransfer, &out);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "transmitting RUA DirectTransfer (cn=%s) payload of %u bytes\n",
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is_ps ? "ps" : "cs", msgb_length(msg));
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return hnbgw_rua_tx(hnb, msg);
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}
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int rua_tx_disc(struct hnb_context *hnb, int is_ps, uint32_t context_id,
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const RUA_Cause_t *cause, const uint8_t *data, unsigned int len)
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{
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RUA_Disconnect_t out;
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RUA_DisconnectIEs_t ies;
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struct msgb *msg;
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uint32_t ctxidbuf;
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int rc;
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memset(&ies, 0, sizeof(ies));
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if (is_ps)
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ies.cN_DomainIndicator = RUA_CN_DomainIndicator_ps_domain;
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else
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ies.cN_DomainIndicator = RUA_CN_DomainIndicator_cs_domain;
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asn1_u24_to_bitstring(&ies.context_ID, &ctxidbuf, context_id);
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memcpy(&ies.cause, cause, sizeof(ies.cause));
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if (data && len) {
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ies.presenceMask |= DISCONNECTIES_RUA_RANAP_MESSAGE_PRESENT;
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ies.ranaP_Message.buf = (uint8_t *) data;
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ies.ranaP_Message.size = len;
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}
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memset(&out, 0, sizeof(out));
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rc = rua_encode_disconnecties(&out, &ies);
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if (rc < 0)
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return rc;
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msg = rua_generate_initiating_message(RUA_ProcedureCode_id_Disconnect,
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RUA_Criticality_reject,
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&asn_DEF_RUA_Disconnect,
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&out);
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_Disconnect, &out);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "transmitting RUA Disconnect (cn=%s) payload of %u bytes\n",
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is_ps ? "ps" : "cs", msgb_length(msg));
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return hnbgw_rua_tx(hnb, msg);
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}
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static struct value_string rua_procedure_code_names[] = {
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{ RUA_ProcedureCode_id_Connect, "Connect" },
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{ RUA_ProcedureCode_id_DirectTransfer, "DirectTransfer" },
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{ RUA_ProcedureCode_id_Disconnect, "Disconnect" },
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{ RUA_ProcedureCode_id_ConnectionlessTransfer, "ConnectionlessTransfer" },
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{ RUA_ProcedureCode_id_ErrorIndication, "ErrorIndication" },
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{ RUA_ProcedureCode_id_privateMessage, "PrivateMessage" },
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{}
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};
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static inline const char *rua_procedure_code_name(enum RUA_ProcedureCode val)
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{
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return get_value_string(rua_procedure_code_names, val);
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}
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/* dispatch a RUA connection-oriented message received from a HNB to a context mapping's RUA FSM, so that it is
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* forwarded to the CN via SCCP connection-oriented messages.
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* Connectionless messages are handled in hnbgw_ranap_rx() instead, not here. */
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static int rua_to_scu(struct hnb_context *hnb,
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RUA_CN_DomainIndicator_t cN_DomainIndicator,
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enum RUA_ProcedureCode rua_procedure,
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uint32_t context_id, uint32_t cause,
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const uint8_t *data, unsigned int len)
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{
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struct msgb *ranap_msg = NULL;
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struct hnbgw_context_map *map = NULL;
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struct hnbgw_cnlink *cn = hnb->gw->sccp.cnlink;
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bool is_ps;
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switch (cN_DomainIndicator) {
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case RUA_CN_DomainIndicator_cs_domain:
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is_ps = false;
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break;
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case RUA_CN_DomainIndicator_ps_domain:
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is_ps = true;
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break;
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default:
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LOGHNB(hnb, DRUA, LOGL_ERROR, "Unsupported Domain %ld\n", cN_DomainIndicator);
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return -1;
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}
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if (!cn) {
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LOGHNB(hnb, DRUA, LOGL_NOTICE, "CN=NULL, discarding message\n");
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return 0;
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}
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/* If there is RANAP data, include it in the msgb. In RUA there is always data in practice, but theoretically it
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* could be an empty Connect or Disconnect. */
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if (data && len) {
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/* According to API doc of map_rua_fsm_event: allocate msgb for RANAP data from OTC_SELECT, reserve
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* headroom for an osmo_scu_prim. Point l2h at the RANAP data. */
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ranap_msg = hnbgw_ranap_msg_alloc("RANAP_from_RUA");
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ranap_msg->l2h = msgb_put(ranap_msg, len);
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memcpy(ranap_msg->l2h, data, len);
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}
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map = context_map_alloc_by_hnb(hnb, context_id, is_ps, cn);
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OSMO_ASSERT(map);
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LOG_MAP(map, DRUA, LOGL_DEBUG, "rx RUA %s with %u bytes RANAP data\n",
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rua_procedure_code_name(rua_procedure), data ? len : 0);
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switch (rua_procedure) {
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case RUA_ProcedureCode_id_Connect:
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return map_rua_dispatch(map, MAP_RUA_EV_RX_CONNECT, ranap_msg);
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case RUA_ProcedureCode_id_DirectTransfer:
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return map_rua_dispatch(map, MAP_RUA_EV_RX_DIRECT_TRANSFER, ranap_msg);
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case RUA_ProcedureCode_id_Disconnect:
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return map_rua_dispatch(map, MAP_RUA_EV_RX_DISCONNECT, ranap_msg);
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default:
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/* No caller may ever pass a different RUA procedure code */
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OSMO_ASSERT(false);
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}
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}
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static uint32_t rua_to_scu_cause(RUA_Cause_t *in)
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{
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/* FIXME: Implement this! */
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#if 0
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switch (in->present) {
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case RUA_Cause_PR_NOTHING:
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break;
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case RUA_Cause_PR_radioNetwork:
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switch (in->choice.radioNetwork) {
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case RUA_CauseRadioNetwork_normal:
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case RUA_CauseRadioNetwork_connect_failed:
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case RUA_CauseRadioNetwork_network_release:
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case RUA_CauseRadioNetwork_unspecified:
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}
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break;
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case RUA_Cause_PR_transport:
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switch (in->choice.transport) {
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case RUA_CauseTransport_transport_resource_unavailable:
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break;
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case RUA_CauseTransport_unspecified:
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break;
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}
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break;
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case RUA_Cause_PR_protocol:
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switch (in->choice.protocol) {
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case RUA_CauseProtocol_transfer_syntax_error:
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break;
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case RUA_CauseProtocol_abstract_syntax_error_reject:
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break;
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case RUA_CauseProtocol_abstract_syntax_error_ignore_and_notify:
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break;
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case RUA_CauseProtocol_message_not_compatible_with_receiver_state:
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break;
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case RUA_CauseProtocol_semantic_error:
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break;
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case RUA_CauseProtocol_unspecified:
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break;
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case RUA_CauseProtocol_abstract_syntax_error_falsely_constructed_message:
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break;
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}
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break;
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case RUA_Cause_PR_misc:
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switch (in->choice.misc) {
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case RUA_CauseMisc_processing_overload:
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break;
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case RUA_CauseMisc_hardware_failure:
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break;
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case RUA_CauseMisc_o_and_m_intervention:
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break;
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case RUA_CauseMisc_unspecified:
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break;
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}
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break;
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default:
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break;
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}
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#else
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return 0;
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#endif
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}
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static int rua_rx_init_connect(struct msgb *msg, ANY_t *in)
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{
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RUA_ConnectIEs_t ies;
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struct hnb_context *hnb = msg->dst;
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uint32_t context_id;
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int rc;
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rc = rua_decode_connecties(&ies, in);
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if (rc < 0)
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return rc;
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context_id = asn1bitstr_to_u24(&ies.context_ID);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "RUA %s Connect.req(ctx=0x%x, %s)\n",
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cn_domain_indicator_to_str(ies.cN_DomainIndicator), context_id,
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ies.establishment_Cause == RUA_Establishment_Cause_emergency_call ? "emergency" : "normal");
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rc = rua_to_scu(hnb, ies.cN_DomainIndicator, RUA_ProcedureCode_id_Connect,
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context_id, 0, ies.ranaP_Message.buf,
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ies.ranaP_Message.size);
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rua_free_connecties(&ies);
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return rc;
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}
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static int rua_rx_init_disconnect(struct msgb *msg, ANY_t *in)
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{
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RUA_DisconnectIEs_t ies;
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struct hnb_context *hnb = msg->dst;
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uint32_t context_id;
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uint32_t scu_cause;
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uint8_t *ranap_data = NULL;
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unsigned int ranap_len = 0;
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int rc;
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rc = rua_decode_disconnecties(&ies, in);
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if (rc < 0)
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return rc;
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context_id = asn1bitstr_to_u24(&ies.context_ID);
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scu_cause = rua_to_scu_cause(&ies.cause);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "RUA Disconnect.req(ctx=0x%x,cause=%s)\n", context_id,
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rua_cause_str(&ies.cause));
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if (ies.presenceMask & DISCONNECTIES_RUA_RANAP_MESSAGE_PRESENT) {
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ranap_data = ies.ranaP_Message.buf;
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ranap_len = ies.ranaP_Message.size;
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}
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rc = rua_to_scu(hnb, ies.cN_DomainIndicator,
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RUA_ProcedureCode_id_Disconnect,
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context_id, scu_cause, ranap_data, ranap_len);
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rua_free_disconnecties(&ies);
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return rc;
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}
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static int rua_rx_init_dt(struct msgb *msg, ANY_t *in)
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{
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RUA_DirectTransferIEs_t ies;
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struct hnb_context *hnb = msg->dst;
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uint32_t context_id;
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int rc;
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rc = rua_decode_directtransferies(&ies, in);
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if (rc < 0)
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return rc;
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context_id = asn1bitstr_to_u24(&ies.context_ID);
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "RUA Data.req(ctx=0x%x)\n", context_id);
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rc = rua_to_scu(hnb,
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ies.cN_DomainIndicator,
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RUA_ProcedureCode_id_DirectTransfer,
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context_id, 0, ies.ranaP_Message.buf,
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ies.ranaP_Message.size);
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rua_free_directtransferies(&ies);
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return rc;
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}
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static int rua_rx_init_udt(struct msgb *msg, ANY_t *in)
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{
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RUA_ConnectionlessTransferIEs_t ies;
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struct hnb_context *hnb = msg->dst;
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int rc;
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rc = rua_decode_connectionlesstransferies(&ies, in);
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if (rc < 0)
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return rc;
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LOGHNB(hnb, DRUA, LOGL_DEBUG, "RUA UData.req()\n");
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/* according tot the spec, we can primarily receive Overload,
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* Reset, Reset ACK, Error Indication, reset Resource, Reset
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* Resurce Acknowledge as connecitonless RANAP. There are some
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* more messages regarding Information Transfer, Direct
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* Information Transfer and Uplink Information Trnansfer that we
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* can ignore. In either case, it is RANAP that we need to
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* decode... */
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rc = hnbgw_ranap_rx(msg, ies.ranaP_Message.buf, ies.ranaP_Message.size);
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rua_free_connectionlesstransferies(&ies);
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return rc;
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}
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static int rua_rx_init_err_ind(struct msgb *msg, ANY_t *in)
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{
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RUA_ErrorIndicationIEs_t ies;
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struct hnb_context *hnb = msg->dst;
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int rc;
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rc = rua_decode_errorindicationies(&ies, in);
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if (rc < 0)
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return rc;
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LOGHNB(hnb, DRUA, LOGL_ERROR, "RUA UData.ErrorInd(%s)\n", rua_cause_str(&ies.cause));
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rua_free_errorindicationies(&ies);
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return rc;
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}
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static int rua_rx_initiating_msg(struct msgb *msg, RUA_InitiatingMessage_t *imsg)
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{
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struct hnb_context *hnb = msg->dst;
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int rc;
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switch (imsg->procedureCode) {
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case RUA_ProcedureCode_id_Connect:
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rc = rua_rx_init_connect(msg, &imsg->value);
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break;
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case RUA_ProcedureCode_id_DirectTransfer:
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rc = rua_rx_init_dt(msg, &imsg->value);
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break;
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case RUA_ProcedureCode_id_Disconnect:
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rc = rua_rx_init_disconnect(msg, &imsg->value);
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break;
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case RUA_ProcedureCode_id_ConnectionlessTransfer:
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rc = rua_rx_init_udt(msg, &imsg->value);
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break;
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case RUA_ProcedureCode_id_ErrorIndication:
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rc = rua_rx_init_err_ind(msg, &imsg->value);
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break;
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case RUA_ProcedureCode_id_privateMessage:
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LOGHNB(hnb, DRUA, LOGL_NOTICE, "Unhandled: RUA Initiating Msg: Private Msg\n");
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rc = 0;
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break;
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default:
|
|
LOGHNB(hnb, DRUA, LOGL_NOTICE, "Unknown RUA Procedure %lu\n", imsg->procedureCode);
|
|
rc = -1;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int rua_rx_successful_outcome_msg(struct msgb *msg, RUA_SuccessfulOutcome_t *in)
|
|
{
|
|
struct hnb_context *hnb = msg->dst;
|
|
/* FIXME */
|
|
LOGHNB(hnb, DRUA, LOGL_NOTICE, "Unexpected RUA Successful Outcome\n");
|
|
return -1;
|
|
}
|
|
|
|
static int rua_rx_unsuccessful_outcome_msg(struct msgb *msg, RUA_UnsuccessfulOutcome_t *in)
|
|
{
|
|
struct hnb_context *hnb = msg->dst;
|
|
/* FIXME */
|
|
LOGHNB(hnb, DRUA, LOGL_NOTICE, "Unexpected RUA Unsucessful Outcome\n");
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int _hnbgw_rua_rx(struct msgb *msg, RUA_RUA_PDU_t *pdu)
|
|
{
|
|
struct hnb_context *hnb = msg->dst;
|
|
int rc;
|
|
|
|
/* it's a bit odd that we can't dispatch on procedure code, but
|
|
* that's not possible */
|
|
switch (pdu->present) {
|
|
case RUA_RUA_PDU_PR_initiatingMessage:
|
|
rc = rua_rx_initiating_msg(msg, &pdu->choice.initiatingMessage);
|
|
break;
|
|
case RUA_RUA_PDU_PR_successfulOutcome:
|
|
rc = rua_rx_successful_outcome_msg(msg, &pdu->choice.successfulOutcome);
|
|
break;
|
|
case RUA_RUA_PDU_PR_unsuccessfulOutcome:
|
|
rc = rua_rx_unsuccessful_outcome_msg(msg, &pdu->choice.unsuccessfulOutcome);
|
|
break;
|
|
default:
|
|
LOGHNB(hnb, DRUA, LOGL_NOTICE, "Unknown RUA presence %u\n", pdu->present);
|
|
rc = -1;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int hnbgw_rua_rx(struct hnb_context *hnb, struct msgb *msg)
|
|
{
|
|
RUA_RUA_PDU_t _pdu, *pdu = &_pdu;
|
|
asn_dec_rval_t dec_ret;
|
|
int rc;
|
|
|
|
/* decode and handle to _hnbgw_hnbap_rx() */
|
|
|
|
memset(pdu, 0, sizeof(*pdu));
|
|
dec_ret = aper_decode(NULL, &asn_DEF_RUA_RUA_PDU, (void **) &pdu,
|
|
msg->data, msgb_length(msg), 0, 0);
|
|
if (dec_ret.code != RC_OK) {
|
|
LOGHNB(hnb, DRUA, LOGL_ERROR, "Error in ASN.1 decode\n");
|
|
return -1;
|
|
}
|
|
|
|
rc = _hnbgw_rua_rx(msg, pdu);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int hnbgw_rua_init(void)
|
|
{
|
|
return 0;
|
|
}
|