diff options
Diffstat (limited to 'src/libiu/iu.c')
-rw-r--r-- | src/libiu/iu.c | 771 |
1 files changed, 0 insertions, 771 deletions
diff --git a/src/libiu/iu.c b/src/libiu/iu.c deleted file mode 100644 index 779497745..000000000 --- a/src/libiu/iu.c +++ /dev/null @@ -1,771 +0,0 @@ -/* Common parts of IuCS and IuPS interfaces implementation */ - -/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> - * 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 <stdint.h> -#include <unistd.h> -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <stdbool.h> - -#include <osmocom/core/select.h> -#include <osmocom/core/prim.h> -#include <osmocom/core/talloc.h> -#include <osmocom/core/logging.h> -#include <osmocom/core/application.h> -#include <osmocom/core/utils.h> -#include <osmocom/vty/logging.h> - -#include <osmocom/gsm/gsm48.h> -#include <osmocom/gprs/gprs_msgb.h> - -#include <osmocom/sigtran/osmo_ss7.h> -#include <osmocom/sigtran/sccp_sap.h> -#include <osmocom/sigtran/sccp_helpers.h> -#include <osmocom/sigtran/protocol/m3ua.h> - -#include <openbsc/gprs_sgsn.h> -#include <openbsc/iu.h> -#include <openbsc/debug.h> - -#include <pdp.h> - -#include <osmocom/ranap/ranap_ies_defs.h> -#include <osmocom/ranap/ranap_common.h> -#include <osmocom/ranap/ranap_common_cn.h> -#include <osmocom/ranap/ranap_msg_factory.h> - -#include <asn1c/asn1helpers.h> - -/* Parsed global RNC id. See also struct RANAP_GlobalRNC_ID, and note that the - * PLMN identity is a BCD representation of the MCC and MNC. - * See iu_grnc_id_parse(). */ -struct iu_grnc_id { - uint16_t mcc; - uint16_t mnc; - uint16_t rnc_id; -}; - -/* A remote RNC (Radio Network Controller, like BSC but for UMTS) that has - * called us and is currently reachable at the given osmo_sccp_addr. So, when we - * know a LAC for a subscriber, we can page it at the RNC matching that LAC or - * RAC. An HNB-GW typically presents itself as if it were a single RNC, even - * though it may have several RNCs in hNodeBs connected to it. Those will then - * share the same RNC id, which they actually receive and adopt from the HNB-GW - * in the HNBAP HNB REGISTER ACCEPT message. */ -struct iu_rnc { - struct llist_head entry; - - uint16_t rnc_id; - uint16_t lac; /* Location Area Code (used for CS and PS) */ - uint8_t rac; /* Routing Area Code (used for PS only) */ - struct osmo_sccp_addr sccp_addr; -}; - -void *talloc_iu_ctx; - -/* Implement the extern asn_debug from libasn1c to indicate whether to print - * asn.1 debug messages (see libasn1c). */ -int asn_debug = 0; - -/* Implement the extern asn1_xer_print to indicate whether the ASN.1 binary - * code decoded and encoded during Iu communication should be logged to stderr - * (see asn.1 generated code in osmo-iuh). */ -int asn1_xer_print = 0; - -void *talloc_asn1_ctx; - -iu_recv_cb_t global_iu_recv_cb = NULL; -iu_event_cb_t global_iu_event_cb = NULL; - -static LLIST_HEAD(ue_conn_ctx_list); -static LLIST_HEAD(rnc_list); - -static struct osmo_sccp_instance *g_sccp; -static struct osmo_sccp_user *g_scu; - -const struct value_string iu_event_type_names[] = { - OSMO_VALUE_STRING(IU_EVENT_RAB_ASSIGN), - OSMO_VALUE_STRING(IU_EVENT_SECURITY_MODE_COMPLETE), - OSMO_VALUE_STRING(IU_EVENT_IU_RELEASE), - OSMO_VALUE_STRING(IU_EVENT_LINK_INVALIDATED), - { 0, NULL } -}; - -struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_addr *addr, uint32_t conn_id) -{ - struct ue_conn_ctx *ctx = talloc_zero(talloc_iu_ctx, struct ue_conn_ctx); - - ctx->sccp_addr = *addr; - ctx->conn_id = conn_id; - llist_add(&ctx->list, &ue_conn_ctx_list); - - return ctx; -} - -struct ue_conn_ctx *ue_conn_ctx_find(uint32_t conn_id) -{ - struct ue_conn_ctx *ctx; - - llist_for_each_entry(ctx, &ue_conn_ctx_list, list) { - if (ctx->conn_id == conn_id) - return ctx; - } - return NULL; -} - -static struct iu_rnc *iu_rnc_alloc(uint16_t rnc_id, uint16_t lac, uint8_t rac, - struct osmo_sccp_addr *addr) -{ - struct iu_rnc *rnc = talloc_zero(talloc_iu_ctx, struct iu_rnc); - - rnc->rnc_id = rnc_id; - rnc->lac = lac; - rnc->rac = rac; - rnc->sccp_addr = *addr; - llist_add(&rnc->entry, &rnc_list); - - LOGP(DRANAP, LOGL_NOTICE, "New RNC %d (LAC=%d RAC=%d)\n", - rnc->rnc_id, rnc->lac, rnc->rac); - - return rnc; -} - -static struct iu_rnc *iu_rnc_register(uint16_t rnc_id, uint16_t lac, - uint8_t rac, struct osmo_sccp_addr *addr) -{ - struct iu_rnc *rnc; - llist_for_each_entry(rnc, &rnc_list, entry) { - if (rnc->rnc_id != rnc_id) - continue; - - /* We have this RNC Id registered already. Make sure that the - * details match. */ - - /* TODO should a mismatch be an error? */ - if (rnc->lac != lac || rnc->rac != rac) - LOGP(DRANAP, LOGL_NOTICE, "RNC %d changes its details:" - " LAC=%d RAC=%d --> LAC=%d RAC=%d\n", - rnc->rnc_id, rnc->lac, rnc->rac, - lac, rac); - rnc->lac = lac; - rnc->rac = rac; - - if (addr && memcmp(&rnc->sccp_addr, addr, sizeof(*addr))) - LOGP(DRANAP, LOGL_NOTICE, "RNC %d on New SCCP Addr %s" - " (LAC=%d RAC=%d)\n", - rnc->rnc_id, osmo_sccp_addr_dump(addr), rnc->lac, rnc->rac); - rnc->sccp_addr = *addr; - return rnc; - } - - /* Not found, make a new one. */ - return iu_rnc_alloc(rnc_id, lac, rac, addr); -} - -/*********************************************************************** - * RANAP handling - ***********************************************************************/ - -int iu_rab_act(struct ue_conn_ctx *ue_ctx, struct msgb *msg) -{ - struct osmo_scu_prim *prim; - - /* wrap RANAP message in SCCP N-DATA.req */ - prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim)); - prim->u.data.conn_id = ue_ctx->conn_id; - osmo_prim_init(&prim->oph, - SCCP_SAP_USER, - OSMO_SCU_PRIM_N_DATA, - PRIM_OP_REQUEST, - msg); - return osmo_sccp_user_sap_down(g_scu, &prim->oph); -} - -int iu_rab_deact(struct ue_conn_ctx *ue_ctx, uint8_t rab_id) -{ - /* FIXME */ - return -1; -} - -int iu_tx_sec_mode_cmd(struct ue_conn_ctx *uectx, struct gsm_auth_tuple *tp, - int send_ck, int new_key) -{ - struct osmo_scu_prim *prim; - struct msgb *msg; - - /* create RANAP message */ - msg = ranap_new_msg_sec_mod_cmd(tp->vec.ik, send_ck? tp->vec.ck : NULL, - new_key ? RANAP_KeyStatus_new : RANAP_KeyStatus_old); - msg->l2h = msg->data; - /* wrap RANAP message in SCCP N-DATA.req */ - prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim)); - prim->u.data.conn_id = uectx->conn_id; - osmo_prim_init(&prim->oph, SCCP_SAP_USER, - OSMO_SCU_PRIM_N_DATA, - PRIM_OP_REQUEST, msg); - osmo_sccp_user_sap_down(g_scu, &prim->oph); - - return 0; -} - -int iu_tx_common_id(struct ue_conn_ctx *uectx, const char *imsi) -{ - struct msgb *msg; - struct osmo_scu_prim *prim; - - LOGP(DRANAP, LOGL_INFO, "Transmitting RANAP CommonID (SCCP conn_id %u)\n", - uectx->conn_id); - - msg = ranap_new_msg_common_id(imsi); - msg->l2h = msg->data; - prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim)); - prim->u.data.conn_id = uectx->conn_id; - osmo_prim_init(&prim->oph, SCCP_SAP_USER, - OSMO_SCU_PRIM_N_DATA, - PRIM_OP_REQUEST, msg); - osmo_sccp_user_sap_down(g_scu, &prim->oph); - return 0; -} - -static int iu_grnc_id_parse(struct iu_grnc_id *dst, - struct RANAP_GlobalRNC_ID *src) -{ - /* The size is coming from arbitrary sender, check it gracefully */ - if (src->pLMNidentity.size != 3) { - LOGP(DRANAP, LOGL_ERROR, "Invalid PLMN Identity size:" - " should be 3, is %d\n", src->pLMNidentity.size); - return -1; - } - gsm48_mcc_mnc_from_bcd(&src->pLMNidentity.buf[0], - &dst->mcc, &dst->mnc); - dst->rnc_id = (uint16_t)src->rNC_ID; - return 0; -} - -#if 0 - -- not used at present -- -static int iu_grnc_id_compose(struct iu_grnc_id *src, - struct RANAP_GlobalRNC_ID *dst) -{ - /* The caller must ensure proper size */ - OSMO_ASSERT(dst->pLMNidentity.size == 3); - gsm48_mcc_mnc_to_bcd(&dst->pLMNidentity.buf[0], - src->mcc, src->mnc); - dst->rNC_ID = src->rnc_id; - return 0; -} -#endif - -static int ranap_handle_co_initial_ue(void *ctx, RANAP_InitialUE_MessageIEs_t *ies) -{ - struct ue_conn_ctx *ue_conn = ctx; - struct gprs_ra_id ra_id; - struct iu_grnc_id grnc_id; - uint16_t sai; - struct msgb *msg = msgb_alloc(256, "RANAP->NAS"); - - if (ranap_parse_lai(&ra_id, &ies->lai) != 0) { - LOGP(DRANAP, LOGL_ERROR, "Failed to parse RANAP LAI IE\n"); - return -1; - } - - if (ies->presenceMask & INITIALUE_MESSAGEIES_RANAP_RAC_PRESENT) { - ra_id.rac = asn1str_to_u8(&ies->rac); - } - - if (iu_grnc_id_parse(&grnc_id, &ies->globalRNC_ID) != 0) { - LOGP(DRANAP, LOGL_ERROR, - "Failed to parse RANAP Global-RNC-ID IE\n"); - return -1; - } - - sai = asn1str_to_u16(&ies->sai.sAC); - msgb_gmmh(msg) = msgb_put(msg, ies->nas_pdu.size); - memcpy(msgb_gmmh(msg), ies->nas_pdu.buf, ies->nas_pdu.size); - - /* Make sure we know the RNC Id and LAC+RAC coming in on this connection. */ - iu_rnc_register(grnc_id.rnc_id, ra_id.lac, ra_id.rac, &ue_conn->sccp_addr); - ue_conn->ra_id = ra_id; - - /* Feed into the MM layer */ - msg->dst = ctx; - global_iu_recv_cb(msg, &ra_id, &sai); - - msgb_free(msg); - - return 0; -} - -static int ranap_handle_co_dt(void *ctx, RANAP_DirectTransferIEs_t *ies) -{ - struct gprs_ra_id _ra_id, *ra_id = NULL; - uint16_t _sai, *sai = NULL; - struct msgb *msg = msgb_alloc(256, "RANAP->NAS"); - - if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_LAI_PRESENT) { - if (ranap_parse_lai(&_ra_id, &ies->lai) != 0) { - LOGP(DRANAP, LOGL_ERROR, "Failed to parse RANAP LAI IE\n"); - return -1; - } - ra_id = &_ra_id; - if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_RAC_PRESENT) { - _ra_id.rac = asn1str_to_u8(&ies->rac); - } - if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_SAI_PRESENT) { - _sai = asn1str_to_u16(&ies->sai.sAC); - sai = &_sai; - } - } - - msgb_gmmh(msg) = msgb_put(msg, ies->nas_pdu.size); - memcpy(msgb_gmmh(msg), ies->nas_pdu.buf, ies->nas_pdu.size); - - /* Feed into the MM/CC/SMS-CP layer */ - msg->dst = ctx; - global_iu_recv_cb(msg, ra_id, sai); - - msgb_free(msg); - - return 0; -} - -static int ranap_handle_co_err_ind(void *ctx, RANAP_ErrorIndicationIEs_t *ies) -{ - if (ies->presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT) - LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication (%s)\n", - ranap_cause_str(&ies->cause)); - else - LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication\n"); - - return 0; -} - -int iu_tx(struct msgb *msg_nas, uint8_t sapi) -{ - struct ue_conn_ctx *uectx = msg_nas->dst; - struct msgb *msg; - struct osmo_scu_prim *prim; - - LOGP(DRANAP, LOGL_INFO, "Transmitting L3 Message as RANAP DT (SCCP conn_id %u)\n", - uectx->conn_id); - - msg = ranap_new_msg_dt(sapi, msg_nas->data, msgb_length(msg_nas)); - msgb_free(msg_nas); - msg->l2h = msg->data; - prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim)); - prim->u.data.conn_id = uectx->conn_id; - osmo_prim_init(&prim->oph, SCCP_SAP_USER, - OSMO_SCU_PRIM_N_DATA, - PRIM_OP_REQUEST, msg); - osmo_sccp_user_sap_down(g_scu, &prim->oph); - return 0; -} - -/* Send Iu Release for the given UE connection. - * If cause is NULL, the standard "No remaining RAB" cause is sent, otherwise - * the provided cause. */ -int iu_tx_release(struct ue_conn_ctx *ctx, const struct RANAP_Cause *cause) -{ - struct msgb *msg; - struct osmo_scu_prim *prim; - static const struct RANAP_Cause default_cause = { - .present = RANAP_Cause_PR_radioNetwork, - .choice.radioNetwork = RANAP_CauseRadioNetwork_no_remaining_rab, - }; - - if (!cause) - cause = &default_cause; - - LOGP(DRANAP, LOGL_INFO, "Transmitting Iu Release (SCCP conn_id %u)\n", - ctx->conn_id); - - msg = ranap_new_msg_iu_rel_cmd(cause); - msg->l2h = msg->data; - prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim)); - prim->u.data.conn_id = ctx->conn_id; - osmo_prim_init(&prim->oph, SCCP_SAP_USER, - OSMO_SCU_PRIM_N_DATA, - PRIM_OP_REQUEST, msg); - return osmo_sccp_user_sap_down(g_scu, &prim->oph); -} - -static int ranap_handle_co_iu_rel_req(struct ue_conn_ctx *ctx, RANAP_Iu_ReleaseRequestIEs_t *ies) -{ - LOGP(DRANAP, LOGL_INFO, "Received Iu Release Request, Sending Release Command\n"); - iu_tx_release(ctx, &ies->cause); - return 0; -} - -static int ranap_handle_co_rab_ass_resp(struct ue_conn_ctx *ctx, RANAP_RAB_AssignmentResponseIEs_t *ies) -{ - int rc = -1; - - LOGP(DRANAP, LOGL_INFO, - "Rx RAB Assignment Response for UE conn_id %u\n", ctx->conn_id); - if (ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_SETUPORMODIFIEDLIST_PRESENT) { - /* TODO: Iterate over list of SetupOrModifiedList IEs and handle each one */ - RANAP_IE_t *ranap_ie = ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.array[0]; - RANAP_RAB_SetupOrModifiedItemIEs_t setup_ies; - - rc = ranap_decode_rab_setupormodifieditemies_fromlist(&setup_ies, &ranap_ie->value); - if (rc) { - LOGP(DRANAP, LOGL_ERROR, "Error in ranap_decode_rab_setupormodifieditemies()\n"); - return rc; - } - - rc = global_iu_event_cb(ctx, IU_EVENT_RAB_ASSIGN, &setup_ies); - - ranap_free_rab_setupormodifieditemies(&setup_ies); - } - /* FIXME: handle RAB Ass failure? */ - - return rc; -} - -/* Entry point for connection-oriented RANAP message */ -static void cn_ranap_handle_co(void *ctx, ranap_message *message) -{ - int rc; - - LOGP(DRANAP, LOGL_NOTICE, "handle_co(dir=%u, proc=%u)\n", message->direction, message->procedureCode); - - switch (message->direction) { - case RANAP_RANAP_PDU_PR_initiatingMessage: - switch (message->procedureCode) { - case RANAP_ProcedureCode_id_InitialUE_Message: - rc = ranap_handle_co_initial_ue(ctx, &message->msg.initialUE_MessageIEs); - break; - case RANAP_ProcedureCode_id_DirectTransfer: - rc = ranap_handle_co_dt(ctx, &message->msg.directTransferIEs); - break; - case RANAP_ProcedureCode_id_ErrorIndication: - rc = ranap_handle_co_err_ind(ctx, &message->msg.errorIndicationIEs); - break; - case RANAP_ProcedureCode_id_Iu_ReleaseRequest: - /* Iu Release Request */ - rc = ranap_handle_co_iu_rel_req(ctx, &message->msg.iu_ReleaseRequestIEs); - break; - default: - LOGP(DRANAP, LOGL_ERROR, "Received Initiating Message: unknown Procedure Code %d\n", - message->procedureCode); - rc = -1; - break; - } - break; - case RANAP_RANAP_PDU_PR_successfulOutcome: - switch (message->procedureCode) { - case RANAP_ProcedureCode_id_SecurityModeControl: - /* Security Mode Complete */ - rc = global_iu_event_cb(ctx, IU_EVENT_SECURITY_MODE_COMPLETE, NULL); - break; - case RANAP_ProcedureCode_id_Iu_Release: - /* Iu Release Complete */ - rc = global_iu_event_cb(ctx, IU_EVENT_IU_RELEASE, NULL); - if (rc) { - LOGP(DRANAP, LOGL_ERROR, "Iu Release event: Iu Event callback returned %d\n", - rc); - } - break; - default: - LOGP(DRANAP, LOGL_ERROR, "Received Successful Outcome: unknown Procedure Code %d\n", - message->procedureCode); - rc = -1; - break; - } - break; - case RANAP_RANAP_PDU_PR_outcome: - switch (message->procedureCode) { - case RANAP_ProcedureCode_id_RAB_Assignment: - /* RAB Assignment Response */ - rc = ranap_handle_co_rab_ass_resp(ctx, &message->msg.raB_AssignmentResponseIEs); - break; - default: - LOGP(DRANAP, LOGL_ERROR, "Received Outcome: unknown Procedure Code %d\n", - message->procedureCode); - rc = -1; - break; - } - break; - case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: - default: - LOGP(DRANAP, LOGL_ERROR, "Received Unsuccessful Outcome: Procedure Code %d\n", - message->procedureCode); - rc = -1; - break; - } - - if (rc) { - LOGP(DRANAP, LOGL_ERROR, "Error in cn_ranap_handle_co (%d)\n", - rc); - /* TODO handling of the error? */ - } -} - -static int ranap_handle_cl_reset_req(void *ctx, RANAP_ResetIEs_t *ies) -{ - /* FIXME: send reset response */ - return -1; -} - -static int ranap_handle_cl_err_ind(void *ctx, RANAP_ErrorIndicationIEs_t *ies) -{ - if (ies->presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT) - LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication (%s)\n", - ranap_cause_str(&ies->cause)); - else - LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication\n"); - - return 0; -} - -/* Entry point for connection-less RANAP message */ -static void cn_ranap_handle_cl(void *ctx, ranap_message *message) -{ - int rc; - - switch (message->direction) { - case RANAP_RANAP_PDU_PR_initiatingMessage: - switch (message->procedureCode) { - case RANAP_ProcedureCode_id_Reset: - /* received reset.req, send reset.resp */ - rc = ranap_handle_cl_reset_req(ctx, &message->msg.resetIEs); - break; - case RANAP_ProcedureCode_id_ErrorIndication: - rc = ranap_handle_cl_err_ind(ctx, &message->msg.errorIndicationIEs); - break; - default: - rc = -1; - break; - } - break; - case RANAP_RANAP_PDU_PR_successfulOutcome: - case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: - case RANAP_RANAP_PDU_PR_outcome: - default: - rc = -1; - break; - } - - if (rc) { - LOGP(DRANAP, LOGL_ERROR, "Error in cn_ranap_handle_cl (%d)\n", - rc); - /* TODO handling of the error? */ - } -} - -/*********************************************************************** - * Paging - ***********************************************************************/ - -struct osmo_sccp_addr local_sccp_addr = { - .presence = OSMO_SCCP_ADDR_T_SSN | OSMO_SCCP_ADDR_T_PC, - .ri = OSMO_SCCP_RI_SSN_PC, - .ssn = OSMO_SCCP_SSN_RANAP, - .pc = 1, -}; - -/* Send a paging command down a given SCCP User. tmsi and paging_cause are - * optional and may be passed NULL and 0, respectively, to disable their use. - * See enum RANAP_PagingCause. - * - * If TMSI is given, the IMSI is not sent over the air interface. Nevertheless, - * the IMSI is still required for resolution in the HNB-GW and/or(?) RNC. */ -static int iu_tx_paging_cmd(struct osmo_sccp_addr *called_addr, - const char *imsi, const uint32_t *tmsi, - bool is_ps, uint32_t paging_cause) -{ - struct msgb *msg; - msg = ranap_new_msg_paging_cmd(imsi, tmsi, is_ps? 1 : 0, paging_cause); - msg->l2h = msg->data; - osmo_sccp_tx_unitdata_msg(g_scu, &local_sccp_addr, called_addr, msg); - return 0; -} - -static int iu_page(const char *imsi, const uint32_t *tmsi_or_ptimsi, - uint16_t lac, uint8_t rac, bool is_ps) -{ - struct iu_rnc *rnc; - int pagings_sent = 0; - - if (tmsi_or_ptimsi) { - LOGP(DRANAP, LOGL_DEBUG, "%s: Looking for RNCs to page for IMSI %s" - " (paging will use %s %x)\n", - is_ps? "IuPS" : "IuCS", - imsi, - is_ps? "PTMSI" : "TMSI", - *tmsi_or_ptimsi); - } else { - LOGP(DRANAP, LOGL_DEBUG, "%s: Looking for RNCs to page for IMSI %s" - " (paging will use IMSI)\n", - is_ps? "IuPS" : "IuCS", - imsi - ); - } - - llist_for_each_entry(rnc, &rnc_list, entry) { - if (rnc->lac != lac) - continue; - if (is_ps && rnc->rac != rac) - continue; - - /* Found a match! */ - if (iu_tx_paging_cmd(&rnc->sccp_addr, imsi, tmsi_or_ptimsi, is_ps, 0) - == 0) { - LOGP(DRANAP, LOGL_DEBUG, - "%s: Paged for IMSI %s on RNC %d, on SCCP addr %s\n", - is_ps? "IuPS" : "IuCS", - imsi, rnc->rnc_id, osmo_sccp_addr_dump(&rnc->sccp_addr)); - pagings_sent ++; - } - } - - /* Some logging... */ - if (pagings_sent > 0) { - LOGP(DRANAP, LOGL_DEBUG, - "%s: %d RNCs were paged for IMSI %s.\n", - is_ps? "IuPS" : "IuCS", - pagings_sent, imsi); - } - else { - if (is_ps) { - LOGP(DRANAP, LOGL_ERROR, "IuPS: Found no RNC to page for" - " LAC %d RAC %d (would have paged IMSI %s)\n", - lac, rac, imsi); - } - else { - LOGP(DRANAP, LOGL_ERROR, "IuCS: Found no RNC to page for" - " LAC %d (would have paged IMSI %s)\n", - lac, imsi); - } - } - - return pagings_sent; -} - -int iu_page_cs(const char *imsi, const uint32_t *tmsi, uint16_t lac) -{ - return iu_page(imsi, tmsi, lac, 0, false); -} - -int iu_page_ps(const char *imsi, const uint32_t *ptmsi, uint16_t lac, uint8_t rac) -{ - return iu_page(imsi, ptmsi, lac, rac, true); -} - - -/*********************************************************************** - * - ***********************************************************************/ - -int tx_unitdata(struct osmo_sccp_user *scu); -int tx_conn_req(struct osmo_sccp_user *scu, uint32_t conn_id); - -struct osmo_prim_hdr *make_conn_req(uint32_t conn_id); -struct osmo_prim_hdr *make_dt1_req(uint32_t conn_id, const uint8_t *data, unsigned int len); - -struct osmo_prim_hdr *make_conn_resp(struct osmo_scu_connect_param *param) -{ - struct msgb *msg = msgb_alloc(1024, "conn_resp"); - struct osmo_scu_prim *prim; - - prim = (struct osmo_scu_prim *) msgb_put(msg, sizeof(*prim)); - osmo_prim_init(&prim->oph, SCCP_SAP_USER, - OSMO_SCU_PRIM_N_CONNECT, - PRIM_OP_RESPONSE, msg); - memcpy(&prim->u.connect, param, sizeof(prim->u.connect)); - return &prim->oph; -} - -static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu) -{ - struct osmo_sccp_user *scu = _scu; - struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; - struct osmo_prim_hdr *resp = NULL; - int rc; - struct ue_conn_ctx *ue; - - DEBUGP(DRANAP, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph)); - - switch (OSMO_PRIM_HDR(oph)) { - case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_CONFIRM): - /* confirmation of outbound connection */ - rc = -1; - break; - case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION): - /* indication of new inbound connection request*/ - DEBUGP(DRANAP, "N-CONNECT.ind(X->%u)\n", prim->u.connect.conn_id); - if (/* prim->u.connect.called_addr.ssn != OSMO_SCCP_SSN_RANAP || */ - !msgb_l2(oph->msg) || msgb_l2len(oph->msg) == 0) { - LOGP(DRANAP, LOGL_NOTICE, - "Received invalid N-CONNECT.ind\n"); - return 0; - } - ue = ue_conn_ctx_alloc(&prim->u.connect.calling_addr, prim->u.connect.conn_id); - /* first ensure the local SCCP socket is ACTIVE */ - resp = make_conn_resp(&prim->u.connect); - osmo_sccp_user_sap_down(scu, resp); - /* then handle the RANAP payload */ - rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg)); - break; - case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION): - /* indication of disconnect */ - DEBUGP(DRANAP, "N-DISCONNECT.ind(%u)\n", - prim->u.disconnect.conn_id); - ue = ue_conn_ctx_find(prim->u.disconnect.conn_id); - rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg)); - break; - case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION): - /* connection-oriented data received */ - DEBUGP(DRANAP, "N-DATA.ind(%u, %s)\n", prim->u.data.conn_id, - osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg))); - /* resolve UE context */ - ue = ue_conn_ctx_find(prim->u.data.conn_id); - rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg)); - break; - case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION): - /* connection-less data received */ - DEBUGP(DRANAP, "N-UNITDATA.ind(%s)\n", - osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg))); - rc = ranap_cn_rx_cl(cn_ranap_handle_cl, scu, msgb_l2(oph->msg), msgb_l2len(oph->msg)); - break; - default: - rc = -1; - break; - } - - msgb_free(oph->msg); - return rc; -} - -int iu_init(void *ctx, struct osmo_sccp_instance *sccp, - iu_recv_cb_t iu_recv_cb, iu_event_cb_t iu_event_cb) -{ - talloc_iu_ctx = talloc_named_const(ctx, 1, "iu"); - talloc_asn1_ctx = talloc_named_const(talloc_iu_ctx, 1, "asn1"); - - global_iu_recv_cb = iu_recv_cb; - global_iu_event_cb = iu_event_cb; - g_sccp = sccp; - g_scu = osmo_sccp_user_bind(g_sccp, "OsmoMSC-Iu", sccp_sap_up, OSMO_SCCP_SSN_RANAP); - - return 0; -} - |