From ee1541d504299227f534a7f15b0c75c18a3f4271 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Mon, 25 Jan 2016 19:24:01 +0100 Subject: put Iu-common and Iu-CS stuff in proper places Add libiu to contain the parts used by both Iu-CS (in osmo-cscn) and Iu-PS (in gprs) into libiu. It's rather thin and may make sense to move to osmo-iuh altogether, eventually. iu.c is half moved to libiu/, and half to osmo-cscn/iu_cs.c. --- openbsc/src/libiu/iu.c | 463 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 463 insertions(+) create mode 100644 openbsc/src/libiu/iu.c (limited to 'openbsc/src/libiu/iu.c') diff --git a/openbsc/src/libiu/iu.c b/openbsc/src/libiu/iu.c new file mode 100644 index 000000000..c1898d0c6 --- /dev/null +++ b/openbsc/src/libiu/iu.c @@ -0,0 +1,463 @@ +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#include +#include +#include + +#include +#include +#include +#include + +#include + +int asn1_xer_print = 1; +void *talloc_asn1_ctx; + +iu_recv_cb_t global_iu_recv_cb = NULL; + +static LLIST_HEAD(ue_conn_ctx_list); + +struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sua_link *link, uint32_t conn_id) +{ + struct ue_conn_ctx *ctx = talloc_zero(NULL, struct ue_conn_ctx); + + ctx->link = link; + ctx->conn_id = conn_id; + llist_add(&ctx->list, &ue_conn_ctx_list); + + return ctx; +} + +struct ue_conn_ctx *ue_conn_ctx_find(struct osmo_sua_link *link, uint32_t conn_id) +{ + struct ue_conn_ctx *ctx; + + llist_for_each_entry(ctx, &ue_conn_ctx_list, list) { + if (ctx->link == link && ctx->conn_id == conn_id) + return ctx; + } + return NULL; +} + +/*********************************************************************** + * RANAP handling + ***********************************************************************/ + +static 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_sua_user_link_down(ue_ctx->link, &prim->oph); +} + +int iu_rab_act_cs(struct ue_conn_ctx *ue_ctx, uint32_t rtp_ip, uint16_t rtp_port) +{ + struct msgb *msg; + + msg = ranap_new_msg_rab_assign_voice(1, rtp_ip, rtp_port); + msg->l2h = msg->data; + return iu_rab_act(ue_ctx, msg); +} + +int iu_rab_act_ps(struct ue_conn_ctx *ue_ctx, uint32_t gtp_ip, uint32_t gtp_tei) +{ + struct msgb *msg; + + msg = ranap_new_msg_rab_assign_data(1, gtp_ip, gtp_tei); + msg->l2h = msg->data; + return iu_rab_act(ue_ctx, msg); +} + +int gprs_iu_rab_deact(struct sgsn_mm_ctx *mm) +{ + /* FIXME */ + return -1; +} + +int gprs_transp_upd_key(struct sgsn_mm_ctx *mm) +{ + struct gsm_auth_tuple *tp = &mm->auth_triplet; + + if (mm->ran_type == MM_CTX_T_UTRAN_Iu) { + struct ue_conn_ctx *uectx; + struct osmo_scu_prim *prim; + struct msgb *msg; + uint8_t ik[16]; + uint8_t ck[16]; + unsigned int i; + + uectx = mm->iu.ue_ctx; + + /* C4 function to dervie CK from Kc */ + memcpy(ck, tp->kc, 8); + memcpy(ck+8, tp->kc, 8); + + /* C5 function to derive IK from Kc */ + for (i = 0; i < 4; i++) + ik[i] = tp->kc[i] ^ tp->kc[i+4]; + memcpy(ik+4, tp->kc, 8); + for (i = 12; i < 16; i++) + ik[i] = ik[i-12]; + + /* crate RANAP message */ + msg = ranap_new_msg_sec_mod_cmd(ik, NULL); + 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_sua_user_link_down(uectx->link, &prim->oph); + } + + return 0; +} + + +static int ranap_handle_co_initial_ue(void *ctx, RANAP_InitialUE_MessageIEs_t *ies) +{ + struct gprs_ra_id ra_id; + uint16_t sai; + struct msgb *msg = msgb_alloc(256, "RANAP->NAS"); + + ranap_parse_lai(&ra_id, &ies->lai); + 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); + + /* Feed into the MM layer */ + msg->dst = ctx; + global_iu_recv_cb(msg, &ra_id, &sai); + + 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) { + ranap_parse_lai(&_ra_id, &ies->lai); + 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); + + 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, uint8_t sapi) +{ + struct ue_conn_ctx *uectx = msg->dst; + struct osmo_scu_prim *prim; + + LOGP(DRANAP, LOGL_INFO, "Transmitting L3 Message as RANAP DT\n"); + + msg = ranap_new_msg_dt(sapi, msg->data, msgb_length(msg)); + 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_sua_user_link_down(uectx->link, &prim->oph); + return 0; +} + +static int ranap_handle_co_iu_rel_req(struct ue_conn_ctx *ctx, RANAP_Iu_ReleaseRequestIEs_t *ies) +{ + struct msgb *msg; + struct osmo_scu_prim *prim; + + LOGP(DRANAP, LOGL_INFO, "Received Iu Release Request, Sending Release Command\n"); + msg = ranap_new_msg_iu_rel_cmd(&ies->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); + osmo_sua_user_link_down(ctx->link, &prim->oph); + return 0; +} + +static int ranap_handle_co_rab_ass_resp(void *ctx, RANAP_RAB_AssignmentResponseIEs_t *ies) +{ + int rc; + + LOGP(DRANAP, LOGL_INFO, "RAB Asignment Response:"); + if (ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_SETUPORMODIFIEDLIST_PRESENT) { + RANAP_RAB_SetupOrModifiedItemIEs_t setup_ies; + RANAP_RAB_SetupOrModifiedItem_t *item = &setup_ies.raB_SetupOrModifiedItem; + rc = ranap_decode_rab_setupormodifieditemies(&setup_ies, + (ANY_t *)&ies->raB_SetupOrModifiedList); + if (item->transportLayerAddress) { + uint8_t rab_id = item->rAB_ID.buf[0]; + LOGPC(DRANAP, LOGL_INFO, " Setup: (%u/%s)", + rab_id, + osmo_hexdump(item->transportLayerAddress->buf, + item->transportLayerAddress->size)); + } + } + + LOGPC(DRANAP, LOGL_INFO, "\n"); + + 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: + rc = -1; + break; + } + break; + case RANAP_RANAP_PDU_PR_successfulOutcome: + 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; + case RANAP_ProcedureCode_id_SecurityModeControl: + /* Security Mode Complete */ + rc = -1; + break; + case RANAP_ProcedureCode_id_Iu_Release: + /* Iu Release Complete */ + rc = -1; + break; + default: + rc = -1; + break; + } + 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_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? */ + } +} + +/*********************************************************************** + * + ***********************************************************************/ + +int tx_unitdata(struct osmo_sua_link *link); +int tx_conn_req(struct osmo_sua_link *link, 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 *link) +{ + struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; + struct osmo_prim_hdr *resp = NULL; + int rc; + struct ue_conn_ctx *ue; + + printf("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*/ + printf("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(DGPRS, LOGL_NOTICE, "Received invalid N-CONNECT.ind\n"); + return 0; + } + ue = ue_conn_ctx_alloc(link, prim->u.connect.conn_id); + /* first ensure the local SUA/SCCP socket is ACTIVE */ + resp = make_conn_resp(&prim->u.connect); + osmo_sua_user_link_down(link, 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 */ + printf("N-DISCONNECT.ind(%u)\n", prim->u.disconnect.conn_id); + ue = ue_conn_ctx_find(link, 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 */ + printf("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(link, 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-oriented data received */ + printf("N-UNITDATA.ind(%s)\n", + osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg))); + rc = ranap_cn_rx_cl(cn_ranap_handle_cl, link, msgb_l2(oph->msg), msgb_l2len(oph->msg)); + break; + default: + rc = -1; + break; + } + + msgb_free(oph->msg); + return rc; +} + +int iu_init(void *ctx, const char *listen_addr, uint16_t listen_port, + iu_recv_cb_t iu_recv_cb) +{ + struct osmo_sua_user *user; + talloc_asn1_ctx = talloc_named_const(ctx, 1, "asn1"); + global_iu_recv_cb = iu_recv_cb; + osmo_sua_set_log_area(DSUA); + user = osmo_sua_user_create(ctx, sccp_sap_up, ctx); + return osmo_sua_server_listen(user, listen_addr, listen_port); +} + -- cgit v1.2.3