#include #include #include #include #include #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include "test_common.h" #include #include #include const char *cmdline_bind_addr = "127.0.0.1"; struct ue_conn_ctx { struct llist_head list; struct osmo_sccp_link *link; uint32_t conn_id; }; static LLIST_HEAD(conn_ctx_list); struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_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, &conn_ctx_list); return ctx; } struct ue_conn_ctx *ue_conn_ctx_find(struct osmo_sccp_link *link, uint32_t conn_id) { struct ue_conn_ctx *ctx; llist_for_each_entry(ctx, &conn_ctx_list, list) { if (ctx->link == link && ctx->conn_id == conn_id) return ctx; } return NULL; } /*********************************************************************** * RANAP handling ***********************************************************************/ static int ranap_handle_co_initial_ue(struct ue_conn_ctx *ctx, RANAP_InitialUE_MessageIEs_t *ies) { struct gprs_ra_id ra_id; uint16_t sai; struct msgb *msg = msgb_alloc(256, "RANAP->NAS"); uint8_t *cur; struct osmo_scu_prim *prim; ranap_parse_lai(&ra_id, &ies->lai); sai = asn1str_to_u16(&ies->sai.sAC); cur = msgb_put(msg, ies->nas_pdu.size); memcpy(msg, ies->nas_pdu.buf, ies->nas_pdu.size); msgb_free(msg); /* FIXME: set msgb_gmmh() */ /* FIXME: Feed into the MM layer */ //rc = gsm0408_gprs_rcvmsg_iu(msg, ra_id, sai, conn_id); msg = ranap_new_msg_dt(0, NULL, 0); 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_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"); uint8_t *cur; 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; } } cur = msgb_put(msg, ies->nas_pdu.size); memcpy(msg, ies->nas_pdu.buf, ies->nas_pdu.size); /* FIXME: set msgb_gmmh() */ /* FIXME: Feed into the MM/CC/SMS-CP layer */ //rc = gsm0408_gprs_rcvmsg_iu(msg, ra_id, sai, conn_id); 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; } 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; } /* Entry point for connection-oriented ANAP message */ static void cn_ranap_handle_co(void *ctx, ranap_message *message) { int rc = 0; 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; } break; case RANAP_RANAP_PDU_PR_successfulOutcome: switch (message->procedureCode) { case RANAP_ProcedureCode_id_RAB_Assignment: /* RAB Assignment Response */ break; case RANAP_ProcedureCode_id_SecurityModeControl: /* Security Mode Complete */ break; case RANAP_ProcedureCode_id_Iu_Release: /* Iu Release Complete */ break; } case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: case RANAP_RANAP_PDU_PR_outcome: default: break; } } static int ranap_handle_cl_reset_req(void *ctx, RANAP_ResetIEs_t *ies) { /* FIXME: send reset response */ LOGP(DRANAP, LOGL_ERROR, "Rx Reset Request\n"); } 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 = 0; 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; } break; case RANAP_RANAP_PDU_PR_successfulOutcome: case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: case RANAP_RANAP_PDU_PR_outcome: default: break; } } /*********************************************************************** * ***********************************************************************/ int tx_unitdata(struct osmo_sccp_link *link); int tx_conn_req(struct osmo_sccp_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; const uint8_t payload[] = { 0xb1, 0xb2, 0xb3 }; 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 */ 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(DMAIN, LOGL_NOTICE, "Received invalid N-CONNECT.ind\n"); return 0; } /* FIXME: allocate UE context */ 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; } msgb_free(oph->msg); return 0; } static void print_usage() { printf("Usage: dummy-cn\n"); } static void print_help() { printf(" -h --help This text.\n"); printf(" -b --bind addr Bind to local IP address (default 127.0.0.1)\n"); } static void handle_options(int argc, char **argv) { while (1) { int option_index = 0, c; static struct option long_options[] = { {"help", 0, 0, 'h'}, {"bind", 1, 0, 'b'}, {0, 0, 0, 0} }; c = getopt_long(argc, argv, "hb:V", long_options, &option_index); if (c == -1) break; switch (c) { case 'h': print_usage(); print_help(); exit(0); case 'b': cmdline_bind_addr = optarg; break; default: printf("Unknown cmdline argument (-h shows help)\n"); exit(1); break; } } } int main(int argc, char **argv) { struct osmo_sccp_user *user; void *ctx = talloc_named_const(NULL, 1, "root"); int rc; int port = 14001; asn1_xer_print = 1; osmo_sua_set_log_area(DSUA); ranap_set_log_area(DRANAP); test_common_init(); handle_options(argc, argv); user = osmo_sua_user_create(ctx, sccp_sap_up, ctx); rc = osmo_sua_server_listen(user, cmdline_bind_addr, port); if (rc < 0) { exit(1); } printf("dummy-cn listening on %s %d\n", cmdline_bind_addr, port); while (1) { osmo_select_main(0); } }