| /* hnb-gw specific code for RUA (Ranap User Adaption) */ |
| |
| /* (C) 2015 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 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 <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/netif/stream.h> |
| |
| #include <osmocom/sigtran/sccp_sap.h> |
| #include <osmocom/sigtran/sua.h> |
| |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "asn1helpers.h" |
| |
| #include "hnbgw.h" |
| #include "hnbgw_ranap.h" |
| #include "rua_common.h" |
| #include "rua_ies_defs.h" |
| #include "context_map.h" |
| |
| static int hnbgw_rua_tx(struct hnb_context *ctx, struct msgb *msg) |
| { |
| if (!msg) |
| return -EINVAL; |
| |
| msgb_sctp_ppid(msg) = IUH_PPI_RUA; |
| osmo_stream_srv_send(ctx->conn, msg); |
| |
| return 0; |
| } |
| |
| int rua_tx_udt(struct hnb_context *hnb, const uint8_t *data, unsigned int len) |
| { |
| RUA_ConnectionlessTransfer_t out; |
| RUA_ConnectionlessTransferIEs_t ies; |
| struct msgb *msg; |
| int rc; |
| |
| memset(&ies, 0, sizeof(ies)); |
| ies.ranaP_Message.buf = (uint8_t *) data; |
| ies.ranaP_Message.size = len; |
| |
| /* FIXME: msgb_free(msg)? ownership not yet clear */ |
| |
| memset(&out, 0, sizeof(out)); |
| rc = rua_encode_connectionlesstransferies(&out, &ies); |
| if (rc < 0) |
| return rc; |
| |
| msg = rua_generate_initiating_message(RUA_ProcedureCode_id_ConnectionlessTransfer, |
| RUA_Criticality_reject, |
| &asn_DEF_RUA_ConnectionlessTransfer, |
| &out); |
| ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_ConnectionlessTransfer, &out); |
| |
| DEBUGP(DRUA, "transmitting RUA payload of %u bytes\n", msgb_length(msg)); |
| |
| return hnbgw_rua_tx(hnb, msg); |
| } |
| |
| int rua_tx_dt(struct hnb_context *hnb, int is_ps, uint32_t context_id, |
| const uint8_t *data, unsigned int len) |
| { |
| RUA_DirectTransfer_t out; |
| RUA_DirectTransferIEs_t ies; |
| uint32_t ctxidbuf; |
| struct msgb *msg; |
| int rc; |
| |
| memset(&ies, 0, sizeof(ies)); |
| if (is_ps) |
| ies.cN_DomainIndicator = RUA_CN_DomainIndicator_ps_domain; |
| else |
| ies.cN_DomainIndicator = RUA_CN_DomainIndicator_cs_domain; |
| asn1_u24_to_bitstring(&ies.context_ID, &ctxidbuf, context_id); |
| ies.ranaP_Message.buf = (uint8_t *) data; |
| ies.ranaP_Message.size = len; |
| |
| /* FIXME: msgb_free(msg)? ownership not yet clear */ |
| |
| memset(&out, 0, sizeof(out)); |
| rc = rua_encode_directtransferies(&out, &ies); |
| if (rc < 0) |
| return rc; |
| |
| msg = rua_generate_initiating_message(RUA_ProcedureCode_id_DirectTransfer, |
| RUA_Criticality_reject, |
| &asn_DEF_RUA_DirectTransfer, |
| &out); |
| ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_DirectTransfer, &out); |
| |
| DEBUGP(DRUA, "transmitting RUA (cn=%s) payload of %u bytes\n", |
| is_ps ? "ps" : "cs", msgb_length(msg)); |
| |
| return hnbgw_rua_tx(hnb, msg); |
| } |
| |
| int rua_tx_disc(struct hnb_context *hnb, int is_ps, uint32_t context_id, |
| const RUA_Cause_t *cause, const uint8_t *data, unsigned int len) |
| { |
| RUA_Disconnect_t out; |
| RUA_DisconnectIEs_t ies; |
| struct msgb *msg; |
| uint32_t ctxidbuf; |
| int rc; |
| |
| memset(&ies, 0, sizeof(ies)); |
| if (is_ps) |
| ies.cN_DomainIndicator = RUA_CN_DomainIndicator_ps_domain; |
| else |
| ies.cN_DomainIndicator = RUA_CN_DomainIndicator_cs_domain; |
| asn1_u24_to_bitstring(&ies.context_ID, &ctxidbuf, context_id); |
| memcpy(&ies.cause, cause, sizeof(ies.cause)); |
| if (data && len) { |
| ies.presenceMask |= DISCONNECTIES_RUA_RANAP_MESSAGE_PRESENT; |
| ies.ranaP_Message.buf = (uint8_t *) data; |
| ies.ranaP_Message.size = len; |
| } |
| |
| /* FIXME: msgb_free(msg)? ownership not yet clear */ |
| |
| memset(&out, 0, sizeof(out)); |
| rc = rua_encode_disconnecties(&out, &ies); |
| if (rc < 0) |
| return rc; |
| |
| msg = rua_generate_initiating_message(RUA_ProcedureCode_id_Disconnect, |
| RUA_Criticality_reject, |
| &asn_DEF_RUA_Disconnect, |
| &out); |
| ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RUA_Disconnect, &out); |
| |
| DEBUGP(DRUA, "transmitting RUA (cn=%s) payload of %u bytes\n", |
| is_ps ? "ps" : "cs", msgb_length(msg)); |
| |
| |
| return hnbgw_rua_tx(hnb, msg); |
| } |
| |
| |
| |
| /* forward a RUA message to the SCCP User API to SCCP/SUA */ |
| static int rua_to_scu(struct hnb_context *hnb, struct hnbgw_cnlink *cn, |
| enum osmo_scu_prim_type type, |
| uint32_t context_id, uint32_t cause, |
| const uint8_t *data, unsigned int len) |
| { |
| struct msgb *msg = msgb_alloc(1500, "rua_to_sua"); |
| struct osmo_scu_prim *prim; |
| struct hnbgw_context_map *map; |
| int rc; |
| |
| if (!cn) { |
| DEBUGP(DRUA, "CN=NULL, discarding message\n"); |
| return 0; |
| } |
| |
| prim = (struct osmo_scu_prim *) msgb_put(msg, sizeof(*prim)); |
| osmo_prim_init(&prim->oph, SCCP_SAP_USER, type, PRIM_OP_REQUEST, msg); |
| |
| map = context_map_alloc_by_hnb(hnb, context_id, cn); |
| |
| /* add primitive header */ |
| switch (type) { |
| case OSMO_SCU_PRIM_N_CONNECT: |
| prim->u.connect.called_addr; |
| prim->u.connect.calling_addr; |
| prim->u.connect.sccp_class = 2; |
| prim->u.connect.conn_id = map->scu_conn_id; |
| break; |
| case OSMO_SCU_PRIM_N_DATA: |
| prim->u.data.conn_id = map->scu_conn_id; |
| break; |
| case OSMO_SCU_PRIM_N_DISCONNECT: |
| prim->u.disconnect.conn_id = map->scu_conn_id; |
| prim->u.disconnect.cause = cause; |
| break; |
| case OSMO_SCU_PRIM_N_UNITDATA: |
| prim->u.unitdata.called_addr; |
| prim->u.unitdata.calling_addr; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| /* add optional data section, if needed */ |
| if (data && len) { |
| msg->l2h = msgb_put(msg, len); |
| memcpy(msg->l2h, data, len); |
| } |
| |
| rc = osmo_sua_user_link_down(cn->sua_link, &prim->oph); |
| |
| return rc; |
| } |
| |
| static uint32_t rua_to_scu_cause(RUA_Cause_t *in) |
| { |
| /* FIXME: Implement this! */ |
| #if 0 |
| switch (in->present) { |
| case RUA_Cause_PR_NOTHING: |
| break; |
| case RUA_Cause_PR_radioNetwork: |
| switch (in->choice.radioNetwork) { |
| case RUA_CauseRadioNetwork_normal: |
| case RUA_CauseRadioNetwork_connect_failed: |
| case RUA_CauseRadioNetwork_network_release: |
| case RUA_CauseRadioNetwork_unspecified: |
| } |
| break; |
| case RUA_Cause_PR_transport: |
| switch (in->choice.transport) { |
| case RUA_CauseTransport_transport_resource_unavailable: |
| break; |
| case RUA_CauseTransport_unspecified: |
| break; |
| } |
| break; |
| case RUA_Cause_PR_protocol: |
| switch (in->choice.protocol) { |
| case RUA_CauseProtocol_transfer_syntax_error: |
| break; |
| case RUA_CauseProtocol_abstract_syntax_error_reject: |
| break; |
| case RUA_CauseProtocol_abstract_syntax_error_ignore_and_notify: |
| break; |
| case RUA_CauseProtocol_message_not_compatible_with_receiver_state: |
| break; |
| case RUA_CauseProtocol_semantic_error: |
| break; |
| case RUA_CauseProtocol_unspecified: |
| break; |
| case RUA_CauseProtocol_abstract_syntax_error_falsely_constructed_message: |
| break; |
| } |
| break; |
| case RUA_Cause_PR_misc: |
| switch (in->choice.misc) { |
| case RUA_CauseMisc_processing_overload: |
| break; |
| case RUA_CauseMisc_hardware_failure: |
| break; |
| case RUA_CauseMisc_o_and_m_intervention: |
| break; |
| case RUA_CauseMisc_unspecified: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| #else |
| return 0; |
| #endif |
| |
| } |
| |
| static int rua_rx_init_connect(struct msgb *msg, ANY_t *in) |
| { |
| RUA_ConnectIEs_t ies; |
| struct hnb_context *hnb = msg->dst; |
| struct hnbgw_cnlink *cn; |
| uint32_t context_id; |
| int rc; |
| |
| rc = rua_decode_connecties(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| context_id = asn1bitstr_to_u24(&ies.context_ID); |
| |
| /* route to CS (MSC) or PS (SGSN) domain */ |
| switch (ies.cN_DomainIndicator) { |
| case RUA_CN_DomainIndicator_cs_domain: |
| cn = hnb->gw->cnlink_cs; |
| break; |
| case RUA_CN_DomainIndicator_ps_domain: |
| cn = hnb->gw->cnlink_ps; |
| break; |
| default: |
| LOGP(DRUA, LOGL_ERROR, "Unsupported Domain %u\n", |
| ies.cN_DomainIndicator); |
| rua_free_connecties(&ies); |
| return -1; |
| } |
| |
| DEBUGP(DRUA, "RUA Connect.req(ctx=0x%x, %s)\n", context_id, |
| ies.establishment_Cause == RUA_Establishment_Cause_emergency_call |
| ? "emergency" : "normal"); |
| |
| rc = rua_to_scu(hnb, cn, OSMO_SCU_PRIM_N_CONNECT, |
| context_id, 0, ies.ranaP_Message.buf, |
| ies.ranaP_Message.size); |
| /* FIXME: what to do with the asn1c-allocated memory */ |
| rua_free_connecties(&ies); |
| |
| return rc; |
| } |
| |
| static int rua_rx_init_disconnect(struct msgb *msg, ANY_t *in) |
| { |
| RUA_DisconnectIEs_t ies; |
| struct hnb_context *hnb = msg->dst; |
| struct hnbgw_cnlink *cn; |
| uint32_t context_id; |
| uint32_t scu_cause; |
| uint8_t *ranap_data = NULL; |
| unsigned int ranap_len = 0; |
| int rc; |
| |
| rc = rua_decode_disconnecties(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| context_id = asn1bitstr_to_u24(&ies.context_ID); |
| scu_cause = rua_to_scu_cause(&ies.cause); |
| |
| DEBUGP(DRUA, "RUA Disconnect.req(ctx=0x%x,cause=%s)\n", context_id, |
| rua_cause_str(&ies.cause)); |
| |
| /* route to CS (MSC) or PS (SGSN) domain */ |
| switch (ies.cN_DomainIndicator) { |
| case RUA_CN_DomainIndicator_cs_domain: |
| cn = hnb->gw->cnlink_cs; |
| break; |
| case RUA_CN_DomainIndicator_ps_domain: |
| cn = hnb->gw->cnlink_ps; |
| break; |
| } |
| |
| if (ies.presenceMask & DISCONNECTIES_RUA_RANAP_MESSAGE_PRESENT) { |
| ranap_data = ies.ranaP_Message.buf; |
| ranap_len = ies.ranaP_Message.size; |
| } |
| |
| rc = rua_to_scu(hnb, cn, OSMO_SCU_PRIM_N_DISCONNECT, |
| context_id, scu_cause, ranap_data, ranap_len); |
| /* FIXME: what to do with the asn1c-allocated memory */ |
| rua_free_disconnecties(&ies); |
| |
| return rc; |
| } |
| |
| static int rua_rx_init_dt(struct msgb *msg, ANY_t *in) |
| { |
| RUA_DirectTransferIEs_t ies; |
| struct hnb_context *hnb = msg->dst; |
| struct hnbgw_cnlink *cn; |
| uint32_t context_id; |
| int rc; |
| |
| rc = rua_decode_directtransferies(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| context_id = asn1bitstr_to_u24(&ies.context_ID); |
| |
| DEBUGP(DRUA, "RUA Data.req(ctx=0x%x)\n", context_id); |
| |
| /* route to CS (MSC) or PS (SGSN) domain */ |
| switch (ies.cN_DomainIndicator) { |
| case RUA_CN_DomainIndicator_cs_domain: |
| cn = hnb->gw->cnlink_cs; |
| break; |
| case RUA_CN_DomainIndicator_ps_domain: |
| cn = hnb->gw->cnlink_ps; |
| break; |
| } |
| |
| rc = rua_to_scu(hnb, cn, OSMO_SCU_PRIM_N_DATA, |
| context_id, 0, ies.ranaP_Message.buf, |
| ies.ranaP_Message.size); |
| /* FIXME: what to do with the asn1c-allocated memory */ |
| rua_free_directtransferies(&ies); |
| |
| return rc; |
| |
| } |
| |
| static int rua_rx_init_udt(struct msgb *msg, ANY_t *in) |
| { |
| RUA_ConnectionlessTransferIEs_t ies; |
| RUA_CN_DomainIndicator_t domain; |
| int rc; |
| |
| rc = rua_decode_connectionlesstransferies(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| DEBUGP(DRUA, "RUA UData.req()\n"); |
| |
| /* according tot the spec, we can primarily receive Overload, |
| * Reset, Reset ACK, Error Indication, reset Resource, Reset |
| * Resurce Acknowledge as connecitonless RANAP. There are some |
| * more messages regarding Information Transfer, Direct |
| * Information Transfer and Uplink Information Trnansfer that we |
| * can ignore. In either case, it is RANAP that we need to |
| * decode... */ |
| rc = hnbgw_ranap_rx(msg, ies.ranaP_Message.buf, ies.ranaP_Message.size); |
| rua_free_connectionlesstransferies(&ies); |
| |
| return rc; |
| } |
| |
| |
| static int rua_rx_init_err_ind(struct msgb *msg, ANY_t *in) |
| { |
| RUA_ErrorIndicationIEs_t ies; |
| int rc; |
| |
| rc = rua_decode_errorindicationies(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| LOGP(DRUA, LOGL_ERROR, "RUA UData.ErrorInd(%s)\n", |
| rua_cause_str(&ies.cause)); |
| |
| rua_free_errorindicationies(&ies); |
| return rc; |
| } |
| |
| static int rua_rx_initiating_msg(struct msgb *msg, RUA_InitiatingMessage_t *imsg) |
| { |
| int rc; |
| |
| switch (imsg->procedureCode) { |
| case RUA_ProcedureCode_id_Connect: |
| rc = rua_rx_init_connect(msg, &imsg->value); |
| break; |
| case RUA_ProcedureCode_id_DirectTransfer: |
| rc = rua_rx_init_dt(msg, &imsg->value); |
| break; |
| case RUA_ProcedureCode_id_Disconnect: |
| rc = rua_rx_init_disconnect(msg, &imsg->value); |
| break; |
| case RUA_ProcedureCode_id_ConnectionlessTransfer: |
| rc = rua_rx_init_udt(msg, &imsg->value); |
| break; |
| case RUA_ProcedureCode_id_ErrorIndication: |
| rc = rua_rx_init_err_ind(msg, &imsg->value); |
| break; |
| case RUA_ProcedureCode_id_privateMessage: |
| break; |
| default: |
| LOGP(DRUA, LOGL_NOTICE, "Unknown RUA Procedure %u\n", |
| imsg->procedureCode); |
| rc = -1; |
| } |
| |
| return rc; |
| } |
| |
| static int rua_rx_successful_outcome_msg(struct msgb *msg, RUA_SuccessfulOutcome_t *in) |
| { |
| /* FIXME */ |
| LOGP(DRUA, LOGL_NOTICE, "Unexpected RUA Sucessful Outcome\n"); |
| return -1; |
| } |
| |
| static int rua_rx_unsuccessful_outcome_msg(struct msgb *msg, RUA_UnsuccessfulOutcome_t *in) |
| { |
| /* FIXME */ |
| LOGP(DRUA, LOGL_NOTICE, "Unexpected RUA Unsucessful Outcome\n"); |
| return -1; |
| } |
| |
| |
| static int _hnbgw_rua_rx(struct msgb *msg, RUA_RUA_PDU_t *pdu) |
| { |
| 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: |
| LOGP(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) { |
| LOGP(DRUA, LOGL_ERROR, "Error in ASN.1 decode\n"); |
| return rc; |
| } |
| |
| rc = _hnbgw_rua_rx(msg, pdu); |
| |
| return rc; |
| } |
| |
| |
| int hnbgw_rua_init(void) |
| { |
| return 0; |
| } |