| /* 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/sua.h> |
| #include <osmocom/sigtran/sua.h> |
| #include <osmocom/sigtran/sccp_sap.h> |
| #include <osmocom/sigtran/sccp_helpers.h> |
| |
| #include "hnbgw.h" |
| #include "hnbgw_rua.h" |
| #include <osmocom/ranap/ranap_ies_defs.h> |
| #include <osmocom/ranap/ranap_msg_factory.h> |
| #include "context_map.h" |
| |
| /*********************************************************************** |
| * Outbound RANAP RESET to CN |
| ***********************************************************************/ |
| |
| int hnbgw_cnlink_change_state(struct hnbgw_cnlink *cnlink, enum hnbgw_cnlink_state state); |
| |
| static int transmit_rst(struct hnbgw_cnlink *cnlink) |
| { |
| struct msgb *msg; |
| struct msgb *msgprim; |
| RANAP_CN_DomainIndicator_t domain; |
| RANAP_Cause_t cause = { |
| .present = RANAP_Cause_PR_transmissionNetwork, |
| .choice. transmissionNetwork = RANAP_CauseTransmissionNetwork_signalling_transport_resource_failure, |
| }; |
| |
| if (cnlink->is_ps) |
| domain = RANAP_CN_DomainIndicator_ps_domain; |
| else |
| domain = RANAP_CN_DomainIndicator_cs_domain; |
| |
| msg = ranap_new_msg_reset(domain, &cause); |
| |
| return osmo_sccp_tx_unitdata_msg(cnlink->sua_link, &cnlink->local_addr, |
| &cnlink->remote_addr, msg); |
| } |
| |
| /* Timer callback once T_RafC expires */ |
| static void cnlink_trafc_cb(void *data) |
| { |
| struct hnbgw_cnlink *cnlink = data; |
| |
| transmit_rst(cnlink); |
| hnbgw_cnlink_change_state(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 */ |
| int 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); |
| 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 = 0; |
| |
| rc = ranap_decode_pagingies(&ies, &imsg->value); |
| |
| /* 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) |
| { |
| int rc; |
| |
| 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 %u from CN, ignoring\n", imsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %u from CN, ignoring\n", imsg->procedureCode); |
| break; |
| } |
| return 0; |
| } |
| |
| static int cn_ranap_rx_successful_msg(struct hnbgw_cnlink *cnlink, |
| RANAP_SuccessfulOutcome_t *omsg) |
| { |
| int rc; |
| |
| 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 %u from CN, ignoring\n", omsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %u 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 %u 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; |
| } |
| } |
| |
| 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 rc; |
| } |
| |
| rc = _cn_ranap_rx(cnlink, pdu, data, len); |
| |
| return rc; |
| } |
| |
| |
| 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; |
| } |
| |
| 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->cn_link->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->cn_link->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_link *slink = ctx; |
| struct hnbgw_cnlink *cnlink = osmo_sua_link_get_user_priv(slink); |
| struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; |
| int rc; |
| |
| LOGP(DMAIN, LOGL_DEBUG, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph)); |
| |
| 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; |
| defualt: |
| LOGP(DMAIN, LOGL_ERROR, |
| "Received unknown prim %u from SCCP USER SAP\n", |
| OSMO_PRIM_HDR(oph)); |
| break; |
| } |
| |
| msgb_free(oph->msg); |
| |
| return 0; |
| } |
| |
| |
| /* Set up a link towards the core network for the circuit switched (is_ps == 0) |
| * or packet switched (is_ps != 0) domain. */ |
| struct hnbgw_cnlink *hnbgw_cnlink_init(struct hnb_gw *gw, const char *host, uint16_t port, int is_ps) |
| { |
| struct hnbgw_cnlink *cnlink = talloc_zero(gw, struct hnbgw_cnlink); |
| int rc; |
| |
| cnlink->gw = gw; |
| INIT_LLIST_HEAD(&cnlink->map_list); |
| cnlink->T_RafC.cb = cnlink_trafc_cb; |
| cnlink->T_RafC.data = cnlink; |
| cnlink->next_conn_id = 1000; |
| cnlink->is_ps = is_ps; |
| osmo_sccp_make_addr_pc_ssn(&cnlink->local_addr, 2, |
| OSMO_SCCP_SSN_RANAP); |
| osmo_sccp_make_addr_pc_ssn(&cnlink->remote_addr, 1, |
| OSMO_SCCP_SSN_RANAP); |
| |
| LOGP(DRUA, LOGL_DEBUG, "New hnbgw_cnlink %p (gw %p): %s %d %s\n", |
| cnlink, cnlink->gw, host, port, is_ps? "PS" : "CS"); |
| |
| cnlink->sua_user = osmo_sua_user_create(cnlink, sccp_sap_up, cnlink); |
| if (!cnlink->sua_user) { |
| LOGP(DMAIN, LOGL_ERROR, "Failed to init SUA\n"); |
| goto out_free; |
| } |
| rc = osmo_sua_client_connect(cnlink->sua_user, host, port); |
| if (rc < 0) { |
| LOGP(DMAIN, LOGL_ERROR, "Failed to connect SUA\n"); |
| goto out_user; |
| } |
| cnlink->sua_link = osmo_sua_client_get_link(cnlink->sua_user); |
| if (!cnlink->sua_link) { |
| LOGP(DMAIN, LOGL_ERROR, "Failed to get SUA link\n"); |
| goto out_disconnect; |
| } |
| |
| llist_add_tail(&cnlink->list, &gw->cn_list); |
| |
| return cnlink; |
| |
| out_disconnect: |
| /* FIXME */ |
| out_user: |
| osmo_sua_user_destroy(cnlink->sua_user); |
| out_free: |
| talloc_free(cnlink); |
| } |