diff options
Diffstat (limited to 'src/iu_client.c')
-rw-r--r-- | src/iu_client.c | 786 |
1 files changed, 786 insertions, 0 deletions
diff --git a/src/iu_client.c b/src/iu_client.c new file mode 100644 index 0000000..4a32c6a --- /dev/null +++ b/src/iu_client.c @@ -0,0 +1,786 @@ +/* Common parts of IuCS and IuPS interfaces implementation */ + +/* (C) 2016-2017 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/ranap/iu_client.h> + +#include <osmocom/core/logging.h> +#include <osmocom/crypt/auth.h> +#include <osmocom/gprs/gprs_msgb.h> +#include <osmocom/sigtran/sccp_sap.h> +#include <osmocom/ranap/ranap_ies_defs.h> +#include <osmocom/ranap/ranap_msg_factory.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 ranap_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; +void *talloc_asn1_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; + +ranap_iu_recv_cb_t global_iu_recv_cb = NULL; +ranap_iu_event_cb_t global_iu_event_cb = NULL; +int iu_log_subsystem = 0; + +#define LOGPIU(level, fmt, args...) \ + LOGP(iu_log_subsystem, level, fmt, ## args) + +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 ranap_iu_event_type_names[] = { + OSMO_VALUE_STRING(RANAP_IU_EVENT_RAB_ASSIGN), + OSMO_VALUE_STRING(RANAP_IU_EVENT_SECURITY_MODE_COMPLETE), + OSMO_VALUE_STRING(RANAP_IU_EVENT_IU_RELEASE), + OSMO_VALUE_STRING(RANAP_IU_EVENT_LINK_INVALIDATED), + { 0, NULL } +}; + +static struct ranap_ue_conn_ctx *ue_conn_ctx_alloc(struct ranap_iu_rnc *rnc, uint32_t conn_id) +{ + struct ranap_ue_conn_ctx *ctx = talloc_zero(talloc_iu_ctx, struct ranap_ue_conn_ctx); + + ctx->rnc = rnc; + ctx->conn_id = conn_id; + llist_add(&ctx->list, &ue_conn_ctx_list); + + return ctx; +} + +static struct ranap_ue_conn_ctx *ue_conn_ctx_find(uint32_t conn_id) +{ + struct ranap_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 ranap_iu_rnc *iu_rnc_alloc(uint16_t rnc_id, uint16_t lac, uint8_t rac, + struct osmo_sccp_addr *addr) +{ + struct ranap_iu_rnc *rnc = talloc_zero(talloc_iu_ctx, struct ranap_iu_rnc); + + rnc->rnc_id = rnc_id; + rnc->lac = lac; + rnc->rac = rac; + rnc->sccp_addr = *addr; + llist_add(&rnc->entry, &rnc_list); + + LOGPIU(LOGL_NOTICE, "New RNC %d (LAC=%d RAC=%d)\n", + rnc->rnc_id, rnc->lac, rnc->rac); + + return rnc; +} + +static struct ranap_iu_rnc *iu_rnc_register(uint16_t rnc_id, uint16_t lac, + uint8_t rac, struct osmo_sccp_addr *addr) +{ + struct ranap_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) + LOGPIU(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))) + LOGPIU(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 ranap_iu_rab_act(struct ranap_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 ranap_iu_rab_deact(struct ranap_ue_conn_ctx *ue_ctx, uint8_t rab_id) +{ + /* FIXME */ + return -1; +} + +int ranap_iu_tx_sec_mode_cmd(struct ranap_ue_conn_ctx *uectx, struct osmo_auth_vector *vec, + int send_ck, int new_key) +{ + struct osmo_scu_prim *prim; + struct msgb *msg; + + /* create RANAP message */ + msg = ranap_new_msg_sec_mod_cmd(vec->ik, send_ck? 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 ranap_iu_tx_common_id(struct ranap_ue_conn_ctx *uectx, const char *imsi) +{ + struct msgb *msg; + struct osmo_scu_prim *prim; + + LOGPIU(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) { + LOGPIU(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 + +struct new_ue_conn_ctx { + struct osmo_sccp_addr sccp_addr; + uint32_t conn_id; +}; + +static int ranap_handle_co_initial_ue(void *ctx, RANAP_InitialUE_MessageIEs_t *ies) +{ + struct new_ue_conn_ctx *new_ctx = ctx; + struct gprs_ra_id ra_id; + struct iu_grnc_id grnc_id; + uint16_t sai; + struct ranap_ue_conn_ctx *ue; + struct msgb *msg = msgb_alloc(256, "RANAP->NAS"); + struct ranap_iu_rnc *rnc; + + if (ranap_parse_lai(&ra_id, &ies->lai) != 0) { + LOGPIU(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) { + LOGPIU(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. */ + rnc = iu_rnc_register(grnc_id.rnc_id, ra_id.lac, ra_id.rac, &new_ctx->sccp_addr); + + ue = ue_conn_ctx_alloc(rnc, new_ctx->conn_id); + OSMO_ASSERT(ue); + ue->ra_id = ra_id; + + /* Feed into the MM layer */ + msg->dst = ue; + 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) { + LOGPIU(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) + LOGPIU(LOGL_ERROR, "Rx Error Indication (%s)\n", + ranap_cause_str(&ies->cause)); + else + LOGPIU(LOGL_ERROR, "Rx Error Indication\n"); + + return 0; +} + +int ranap_iu_tx(struct msgb *msg_nas, uint8_t sapi) +{ + struct ranap_ue_conn_ctx *uectx = msg_nas->dst; + struct msgb *msg; + struct osmo_scu_prim *prim; + + LOGPIU(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 ranap_iu_tx_release(struct ranap_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 ranap_ue_conn_ctx *ctx, RANAP_Iu_ReleaseRequestIEs_t *ies) +{ + LOGPIU(LOGL_INFO, "Received Iu Release Request, Sending Release Command\n"); + ranap_iu_tx_release(ctx, &ies->cause); + return 0; +} + +static int ranap_handle_co_rab_ass_resp(struct ranap_ue_conn_ctx *ctx, RANAP_RAB_AssignmentResponseIEs_t *ies) +{ + int rc = -1; + + LOGPIU(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) { + LOGPIU(LOGL_ERROR, "Error in ranap_decode_rab_setupormodifieditemies()\n"); + return rc; + } + + rc = global_iu_event_cb(ctx, RANAP_IU_EVENT_RAB_ASSIGN, &setup_ies); + + ranap_free_rab_setupormodifieditemies(&setup_ies); + } + /* FIXME: handle RAB Ass failure? */ + + return rc; +} + +static void cn_ranap_handle_co_initial(void *ctx, ranap_message *message) +{ + int rc; + + LOGPIU(LOGL_NOTICE, "handle_co_initial(dir=%u, proc=%u)\n", message->direction, message->procedureCode); + + if (message->direction != RANAP_RANAP_PDU_PR_initiatingMessage + || message->procedureCode != RANAP_ProcedureCode_id_InitialUE_Message) { + LOGPIU(LOGL_ERROR, "Expected direction 'InitiatingMessage'," + " procedureCode 'InitialUE_Message', instead got %u and %u\n", + message->direction, message->procedureCode); + rc = -1; + } + else + rc = ranap_handle_co_initial_ue(ctx, &message->msg.initialUE_MessageIEs); + + if (rc) { + LOGPIU(LOGL_ERROR, "Error in %s (%d)\n", __func__, rc); + /* TODO handling of the error? */ + } +} + +/* Entry point for connection-oriented RANAP message */ +static void cn_ranap_handle_co(void *ctx, ranap_message *message) +{ + int rc; + + LOGPIU(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: + LOGPIU(LOGL_ERROR, "Got InitialUE_Message but this is not a new conn\n"); + rc = -1; + 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: + LOGPIU(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, RANAP_IU_EVENT_SECURITY_MODE_COMPLETE, NULL); + break; + case RANAP_ProcedureCode_id_Iu_Release: + /* Iu Release Complete */ + rc = global_iu_event_cb(ctx, RANAP_IU_EVENT_IU_RELEASE, NULL); + if (rc) { + LOGPIU(LOGL_ERROR, "Iu Release event: Iu Event callback returned %d\n", + rc); + } + break; + default: + LOGPIU(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: + LOGPIU(LOGL_ERROR, "Received Outcome: unknown Procedure Code %d\n", + message->procedureCode); + rc = -1; + break; + } + break; + case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: + default: + LOGPIU(LOGL_ERROR, "Received Unsuccessful Outcome: Procedure Code %d\n", + message->procedureCode); + rc = -1; + break; + } + + if (rc) { + LOGPIU(LOGL_ERROR, "Error in %s (%d)\n", __func__, 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) + LOGPIU(LOGL_ERROR, "Rx Error Indication (%s)\n", + ranap_cause_str(&ies->cause)); + else + LOGPIU(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) { + LOGPIU(LOGL_ERROR, "Error in %s (%d)\n", __func__, 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 ranap_iu_rnc *rnc; + int pagings_sent = 0; + + if (tmsi_or_ptimsi) { + LOGPIU(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 { + LOGPIU(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) { + LOGPIU(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) { + LOGPIU(LOGL_DEBUG, + "%s: %d RNCs were paged for IMSI %s.\n", + is_ps? "IuPS" : "IuCS", + pagings_sent, imsi); + } + else { + if (is_ps) { + LOGPIU(LOGL_ERROR, "IuPS: Found no RNC to page for" + " LAC %d RAC %d (would have paged IMSI %s)\n", + lac, rac, imsi); + } + else { + LOGPIU(LOGL_ERROR, "IuCS: Found no RNC to page for" + " LAC %d (would have paged IMSI %s)\n", + lac, imsi); + } + } + + return pagings_sent; +} + +int ranap_iu_page_cs(const char *imsi, const uint32_t *tmsi, uint16_t lac) +{ + return iu_page(imsi, tmsi, lac, 0, false); +} + +int ranap_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); + +static 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 ranap_ue_conn_ctx *ue; + struct new_ue_conn_ctx new_ctx = {}; + + LOGPIU(LOGL_DEBUG, "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*/ + LOGPIU(LOGL_DEBUG, "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) { + LOGPIU(LOGL_NOTICE, + "Received invalid N-CONNECT.ind\n"); + return 0; + } + new_ctx.sccp_addr = prim->u.connect.calling_addr; + new_ctx.conn_id = 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_initial, &new_ctx, msgb_l2(oph->msg), msgb_l2len(oph->msg)); + break; + case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION): + /* indication of disconnect */ + LOGPIU(LOGL_DEBUG, "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 */ + LOGPIU(LOGL_DEBUG, "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 */ + LOGPIU(LOGL_DEBUG, "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 ranap_iu_init(void *ctx, int log_subsystem, const char *sccp_user_name, struct osmo_sccp_instance *sccp, + ranap_iu_recv_cb_t iu_recv_cb, ranap_iu_event_cb_t iu_event_cb) +{ + iu_log_subsystem = log_subsystem; + 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, sccp_user_name, sccp_sap_up, OSMO_SCCP_SSN_RANAP); + + return 0; +} + |