| /* IuCS/IuPS Core Network interface of HNB-GW */ |
| |
| /* (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 <arpa/inet.h> |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/timer.h> |
| |
| #include <osmocom/sigtran/protocol/m3ua.h> |
| #include <osmocom/sigtran/sccp_sap.h> |
| #include <osmocom/sigtran/sccp_helpers.h> |
| |
| #include <osmocom/iuh/hnbgw.h> |
| #include <osmocom/iuh/hnbgw_rua.h> |
| #include <osmocom/ranap/ranap_ies_defs.h> |
| #include <osmocom/ranap/ranap_msg_factory.h> |
| #include <osmocom/iuh/context_map.h> |
| |
| /*********************************************************************** |
| * Outbound RANAP RESET to CN |
| ***********************************************************************/ |
| |
| void hnbgw_cnlink_change_state(struct hnbgw_cnlink *cnlink, enum hnbgw_cnlink_state state); |
| |
| static int transmit_rst(struct hnb_gw *gw, RANAP_CN_DomainIndicator_t domain, |
| struct osmo_sccp_addr *remote_addr) |
| { |
| struct msgb *msg; |
| RANAP_Cause_t cause = { |
| .present = RANAP_Cause_PR_transmissionNetwork, |
| .choice. transmissionNetwork = RANAP_CauseTransmissionNetwork_signalling_transport_resource_failure, |
| }; |
| |
| msg = ranap_new_msg_reset(domain, &cause); |
| |
| return osmo_sccp_tx_unitdata_msg(gw->sccp.cnlink->sccp_user, |
| &gw->sccp.local_addr, |
| remote_addr, |
| msg); |
| } |
| |
| /* Timer callback once T_RafC expires */ |
| static void cnlink_trafc_cb(void *data) |
| { |
| struct hnb_gw *gw = data; |
| |
| transmit_rst(gw, RANAP_CN_DomainIndicator_cs_domain, &gw->sccp.iucs_remote_addr); |
| transmit_rst(gw, RANAP_CN_DomainIndicator_ps_domain, &gw->sccp.iups_remote_addr); |
| hnbgw_cnlink_change_state(gw->sccp.cnlink, CNLINK_S_EST_RST_TX_WAIT_ACK); |
| /* The spec states that we should abandon after a configurable |
| * number of times. We decide to simply continue trying */ |
| } |
| |
| /* change the state of a CN Link */ |
| void hnbgw_cnlink_change_state(struct hnbgw_cnlink *cnlink, enum hnbgw_cnlink_state state) |
| { |
| switch (state) { |
| case CNLINK_S_NULL: |
| case CNLINK_S_EST_PEND: |
| break; |
| case CNLINK_S_EST_CONF: |
| cnlink_trafc_cb(cnlink->gw); |
| break; |
| case CNLINK_S_EST_RST_TX_WAIT_ACK: |
| osmo_timer_schedule(&cnlink->T_RafC, 5, 0); |
| break; |
| case CNLINK_S_EST_ACTIVE: |
| osmo_timer_del(&cnlink->T_RafC); |
| break; |
| } |
| } |
| |
| /*********************************************************************** |
| * Incoming primitives from SCCP User SAP |
| ***********************************************************************/ |
| |
| static int cn_ranap_rx_reset_cmd(struct hnbgw_cnlink *cnlink, |
| RANAP_InitiatingMessage_t *imsg) |
| { |
| RANAP_ResetIEs_t ies; |
| int rc; |
| |
| rc = ranap_decode_reseties(&ies, &imsg->value); |
| /* FIXME: reset resources and return reset ack */ |
| |
| ranap_free_reseties(&ies); |
| return rc; |
| } |
| |
| static int cn_ranap_rx_reset_ack(struct hnbgw_cnlink *cnlink, |
| RANAP_SuccessfulOutcome_t *omsg) |
| { |
| RANAP_ResetAcknowledgeIEs_t ies; |
| int rc; |
| |
| rc = ranap_decode_resetacknowledgeies(&ies, &omsg->value); |
| |
| hnbgw_cnlink_change_state(cnlink, CNLINK_S_EST_ACTIVE); |
| |
| ranap_free_resetacknowledgeies(&ies); |
| return rc; |
| } |
| |
| static int cn_ranap_rx_paging_cmd(struct hnbgw_cnlink *cnlink, |
| RANAP_InitiatingMessage_t *imsg, |
| const uint8_t *data, unsigned int len) |
| { |
| struct hnb_gw *gw = cnlink->gw; |
| struct hnb_context *hnb; |
| RANAP_PagingIEs_t ies; |
| int rc; |
| |
| rc = ranap_decode_pagingies(&ies, &imsg->value); |
| if (rc < 0) |
| return rc; |
| |
| /* FIXME: determine which HNBs to send this Paging command, |
| * rather than broadcasting to all HNBs */ |
| llist_for_each_entry(hnb, &gw->hnb_list, list) { |
| rc = rua_tx_udt(hnb, data, len); |
| } |
| |
| ranap_free_pagingies(&ies); |
| return 0; |
| } |
| |
| static int cn_ranap_rx_initiating_msg(struct hnbgw_cnlink *cnlink, |
| RANAP_InitiatingMessage_t *imsg, |
| const uint8_t *data, unsigned int len) |
| { |
| switch (imsg->procedureCode) { |
| case RANAP_ProcedureCode_id_Reset: |
| return cn_ranap_rx_reset_cmd(cnlink, imsg); |
| case RANAP_ProcedureCode_id_Paging: |
| return cn_ranap_rx_paging_cmd(cnlink, imsg, data, len); |
| case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */ |
| break; |
| case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */ |
| break; |
| case RANAP_ProcedureCode_id_ResetResource: /* request */ |
| case RANAP_ProcedureCode_id_InformationTransfer: |
| case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "Procedure %ld from CN, ignoring\n", imsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %ld from CN, ignoring\n", imsg->procedureCode); |
| break; |
| } |
| return 0; |
| } |
| |
| static int cn_ranap_rx_successful_msg(struct hnbgw_cnlink *cnlink, |
| RANAP_SuccessfulOutcome_t *omsg) |
| { |
| switch (omsg->procedureCode) { |
| case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */ |
| return cn_ranap_rx_reset_ack(cnlink, omsg); |
| case RANAP_ProcedureCode_id_ResetResource: /* response */ |
| case RANAP_ProcedureCode_id_InformationTransfer: |
| case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "Procedure %ld from CN, ignoring\n", omsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %ld from CN, ignoring\n", omsg->procedureCode); |
| break; |
| } |
| return 0; |
| } |
| |
| |
| static int _cn_ranap_rx(struct hnbgw_cnlink *cnlink, RANAP_RANAP_PDU_t *pdu, |
| const uint8_t *data, unsigned int len) |
| { |
| int rc; |
| |
| switch (pdu->present) { |
| case RANAP_RANAP_PDU_PR_initiatingMessage: |
| rc = cn_ranap_rx_initiating_msg(cnlink, &pdu->choice.initiatingMessage, |
| data, len); |
| break; |
| case RANAP_RANAP_PDU_PR_successfulOutcome: |
| rc = cn_ranap_rx_successful_msg(cnlink, &pdu->choice.successfulOutcome); |
| break; |
| case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "unsuccessful outcome procedure %ld from CN, ignoring\n", |
| pdu->choice.unsuccessfulOutcome.procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "presence %u from CN, ignoring\n", pdu->present); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| static int handle_cn_ranap(struct hnbgw_cnlink *cnlink, const uint8_t *data, |
| unsigned int len) |
| { |
| RANAP_RANAP_PDU_t _pdu, *pdu = &_pdu; |
| asn_dec_rval_t dec_ret; |
| int rc; |
| |
| memset(pdu, 0, sizeof(*pdu)); |
| dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu, |
| data, len, 0, 0); |
| if (dec_ret.code != RC_OK) { |
| LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n"); |
| return -1; |
| } |
| |
| rc = _cn_ranap_rx(cnlink, pdu, data, len); |
| |
| return rc; |
| } |
| |
| static bool pc_and_ssn_match(const struct osmo_sccp_addr *a, const struct osmo_sccp_addr *b) |
| { |
| return (a == b) |
| || ((a->pc == b->pc) |
| && (a->ssn == b->ssn)); |
| } |
| |
| static int classify_cn_remote_addr(const struct hnb_gw *gw, |
| const struct osmo_sccp_addr *cn_remote_addr, |
| bool *is_ps) |
| { |
| if (pc_and_ssn_match(cn_remote_addr, &gw->sccp.iucs_remote_addr)) { |
| if (is_ps) |
| *is_ps = false; |
| return 0; |
| } |
| if (pc_and_ssn_match(cn_remote_addr, &gw->sccp.iups_remote_addr)) { |
| if (is_ps) |
| *is_ps = true; |
| return 0; |
| } |
| LOGP(DMAIN, LOGL_ERROR, "Unexpected remote address, matches neither CS nor PS address: %s\n", |
| osmo_sccp_addr_dump(cn_remote_addr)); |
| return -1; |
| } |
| |
| static int handle_cn_unitdata(struct hnbgw_cnlink *cnlink, |
| const struct osmo_scu_unitdata_param *param, |
| struct osmo_prim_hdr *oph) |
| { |
| if (param->called_addr.ssn != OSMO_SCCP_SSN_RANAP) { |
| LOGP(DMAIN, LOGL_NOTICE, "N-UNITDATA.ind for unknown SSN %u\n", |
| param->called_addr.ssn); |
| return -1; |
| } |
| |
| if (classify_cn_remote_addr(cnlink->gw, ¶m->calling_addr, NULL) < 0) |
| return -1; |
| |
| return handle_cn_ranap(cnlink, msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| } |
| |
| static int handle_cn_conn_conf(struct hnbgw_cnlink *cnlink, |
| const struct osmo_scu_connect_param *param, |
| struct osmo_prim_hdr *oph) |
| { |
| /* we don't actually need to do anything, as RUA towards the HNB |
| * doesn't seem to know any confirmations to its CONNECT |
| * operation */ |
| |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_conn_conf() conn_id=%d\n", |
| param->conn_id); |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_conn_conf() called_addr=%s\n", |
| inet_ntoa(param->called_addr.ip.v4)); |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_conn_conf() calling_addr=%s\n", |
| inet_ntoa(param->calling_addr.ip.v4)); |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_conn_conf() responding_addr=%s\n", |
| inet_ntoa(param->responding_addr.ip.v4)); |
| |
| return 0; |
| } |
| |
| static int handle_cn_data_ind(struct hnbgw_cnlink *cnlink, |
| const struct osmo_scu_data_param *param, |
| struct osmo_prim_hdr *oph) |
| { |
| struct hnbgw_context_map *map; |
| |
| /* connection-oriented data is always passed transparently |
| * towards the specific HNB, via a RUA connection identified by |
| * conn_id */ |
| |
| map = context_map_by_cn(cnlink, param->conn_id); |
| if (!map) { |
| /* FIXME: Return an error / released primitive */ |
| return 0; |
| } |
| |
| return rua_tx_dt(map->hnb_ctx, map->is_ps, map->rua_ctx_id, |
| msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| } |
| |
| static int handle_cn_disc_ind(struct hnbgw_cnlink *cnlink, |
| const struct osmo_scu_disconn_param *param, |
| struct osmo_prim_hdr *oph) |
| { |
| struct hnbgw_context_map *map; |
| |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_disc_ind() conn_id=%d originator=%d\n", |
| param->conn_id, param->originator); |
| LOGP(DMAIN, LOGL_DEBUG, "handle_cn_disc_ind() responding_addr=%s\n", |
| inet_ntoa(param->responding_addr.ip.v4)); |
| |
| RUA_Cause_t rua_cause = { |
| .present = RUA_Cause_PR_NOTHING, |
| /* FIXME: Convert incoming SCCP cause to RUA cause */ |
| }; |
| |
| /* we need to notify the HNB associated with this connection via |
| * a RUA DISCONNECT */ |
| |
| map = context_map_by_cn(cnlink, param->conn_id); |
| if (!map) { |
| /* FIXME: Return an error / released primitive */ |
| return 0; |
| } |
| |
| return rua_tx_disc(map->hnb_ctx, map->is_ps, map->rua_ctx_id, |
| &rua_cause, msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| } |
| |
| /* Entry point for primitives coming up from SCCP User SAP */ |
| static int sccp_sap_up(struct osmo_prim_hdr *oph, void *ctx) |
| { |
| struct osmo_sccp_user *scu = ctx; |
| struct hnbgw_cnlink *cnlink; |
| struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; |
| int rc = 0; |
| |
| LOGP(DMAIN, LOGL_DEBUG, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph)); |
| |
| if (!scu) { |
| LOGP(DMAIN, LOGL_ERROR, |
| "sccp_sap_up(): NULL osmo_sccp_user, cannot send prim (sap %u prim %u op %d)\n", |
| oph->sap, oph->primitive, oph->operation); |
| return -1; |
| } |
| |
| cnlink = osmo_sccp_user_get_priv(scu); |
| if (!cnlink) { |
| LOGP(DMAIN, LOGL_ERROR, |
| "sccp_sap_up(): NULL hnbgw_cnlink, cannot send prim (sap %u prim %u op %d)\n", |
| oph->sap, oph->primitive, oph->operation); |
| return -1; |
| } |
| |
| switch (OSMO_PRIM_HDR(oph)) { |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION): |
| rc = handle_cn_unitdata(cnlink, &prim->u.unitdata, oph); |
| break; |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_CONFIRM): |
| rc = handle_cn_conn_conf(cnlink, &prim->u.connect, oph); |
| break; |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION): |
| rc = handle_cn_data_ind(cnlink, &prim->u.data, oph); |
| break; |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION): |
| rc = handle_cn_disc_ind(cnlink, &prim->u.disconnect, oph); |
| break; |
| default: |
| LOGP(DMAIN, LOGL_ERROR, |
| "Received unknown prim %u from SCCP USER SAP\n", |
| OSMO_PRIM_HDR(oph)); |
| break; |
| } |
| |
| msgb_free(oph->msg); |
| |
| return rc; |
| } |
| |
| static bool addr_has_pc_and_ssn(const struct osmo_sccp_addr *addr) |
| { |
| if (!(addr->presence & OSMO_SCCP_ADDR_T_SSN)) |
| return false; |
| if (!(addr->presence & OSMO_SCCP_ADDR_T_PC)) |
| return false; |
| return true; |
| } |
| |
| static int resolve_addr_name(struct osmo_sccp_addr *dest, struct osmo_ss7_instance **ss7, |
| const char *addr_name, const char *label) |
| { |
| struct osmo_ss7_instance *ss7_tmp; |
| |
| if (!addr_name) { |
| LOGP(DMAIN, LOGL_ERROR, "Missing config: %s remote-addr\n", label); |
| return -1; |
| } |
| |
| ss7_tmp = osmo_sccp_addr_by_name(dest, addr_name); |
| if (!ss7_tmp) { |
| LOGP(DMAIN, LOGL_ERROR, "%s remote addr: no such SCCP address book entry: '%s'\n", |
| label, addr_name); |
| return -1; |
| } |
| |
| if (*ss7 && (*ss7 != ss7_tmp)) { |
| LOGP(DMAIN, LOGL_ERROR, "IuCS and IuPS cannot be served from separate CS7 instances," |
| " cs7 instance %d != %d\n", (*ss7)->cfg.id, ss7_tmp->cfg.id); |
| return -1; |
| } |
| |
| *ss7 = ss7_tmp; |
| |
| osmo_sccp_addr_set_ssn(dest, OSMO_SCCP_SSN_RANAP); |
| |
| if (!addr_has_pc_and_ssn(dest)) { |
| LOGP(DMAIN, LOGL_ERROR, "Invalid/incomplete %s remote-addr: %s\n", |
| label, osmo_sccp_addr_name(*ss7, dest)); |
| return -1; |
| } |
| |
| LOGP(DRANAP, LOGL_NOTICE, "Remote %s SCCP addr: %s\n", |
| label, osmo_sccp_addr_name(*ss7, dest)); |
| return 0; |
| } |
| |
| int hnbgw_cnlink_init(struct hnb_gw *gw, const char *stp_host, uint16_t stp_port, const char *local_ip) |
| { |
| struct hnbgw_cnlink *cnlink; |
| struct osmo_ss7_instance *ss7; |
| uint32_t local_pc; |
| |
| OSMO_ASSERT(!gw->sccp.client); |
| OSMO_ASSERT(!gw->sccp.cnlink); |
| |
| ss7 = NULL; |
| if (resolve_addr_name(&gw->sccp.iucs_remote_addr, &ss7, |
| gw->config.iucs_remote_addr_name, "IuCS")) |
| return -1; |
| if (resolve_addr_name(&gw->sccp.iups_remote_addr, &ss7, |
| gw->config.iups_remote_addr_name, "IuPS")) |
| return -1; |
| |
| if (!osmo_ss7_pc_is_valid(ss7->cfg.primary_pc)) { |
| LOGP(DMAIN, LOGL_ERROR, "IuCS/IuPS uplink cannot be setup: CS7 instance %d has no point-code set\n", |
| ss7->cfg.id); |
| return -1; |
| } |
| local_pc = ss7->cfg.primary_pc; |
| |
| osmo_sccp_make_addr_pc_ssn(&gw->sccp.local_addr, local_pc, OSMO_SCCP_SSN_RANAP); |
| LOGP(DRANAP, LOGL_NOTICE, "Local SCCP addr: %s\n", osmo_sccp_addr_name(ss7, &gw->sccp.local_addr)); |
| |
| gw->sccp.client = osmo_sccp_simple_client_on_ss7_id(gw, ss7->cfg.id, "OsmoHNBGW", |
| local_pc, OSMO_SS7_ASP_PROT_M3UA, |
| 0, local_ip, stp_port, stp_host); |
| if (!gw->sccp.client) { |
| LOGP(DMAIN, LOGL_ERROR, "Failed to init SCCP Client\n"); |
| return -1; |
| } |
| |
| cnlink = talloc_zero(gw, struct hnbgw_cnlink); |
| cnlink->gw = gw; |
| INIT_LLIST_HEAD(&cnlink->map_list); |
| cnlink->T_RafC.cb = cnlink_trafc_cb; |
| cnlink->T_RafC.data = gw; |
| cnlink->next_conn_id = 1000; |
| |
| cnlink->sccp_user = osmo_sccp_user_bind_pc(gw->sccp.client, "OsmoHNBGW", sccp_sap_up, |
| OSMO_SCCP_SSN_RANAP, gw->sccp.local_addr.pc); |
| if (!cnlink->sccp_user) { |
| LOGP(DMAIN, LOGL_ERROR, "Failed to init SCCP User\n"); |
| return -1; |
| } |
| |
| /* In sccp_sap_up() we expect the cnlink in the user's priv. */ |
| osmo_sccp_user_set_priv(cnlink->sccp_user, cnlink); |
| |
| gw->sccp.cnlink = cnlink; |
| |
| return 0; |
| } |