diff options
author | Harald Welte <laforge@gnumonks.org> | 2015-12-29 17:52:51 +0100 |
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committer | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2016-03-03 16:19:07 +0100 |
commit | 648b9db47f191c905f3fa52ea67c564e322e7436 (patch) | |
tree | 99e54038ecdce3da6cff301397a33b07f627c3fb /openbsc | |
parent | 8291623054abeb224f34584c2ecebf2b6c04ceae (diff) |
add sgsn_iu.c that was missed in large WIP commit
Diffstat (limited to 'openbsc')
-rw-r--r-- | openbsc/src/gprs/sgsn_iu.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/openbsc/src/gprs/sgsn_iu.c b/openbsc/src/gprs/sgsn_iu.c new file mode 100644 index 000000000..1cb95f587 --- /dev/null +++ b/openbsc/src/gprs/sgsn_iu.c @@ -0,0 +1,425 @@ +#include <stdint.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.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/vty/logging.h> + +#include <osmocom/gsm/gsm48.h> +#include <osmocom/gprs/gprs_msgb.h> + +#include <osmocom/sigtran/sua.h> +#include <osmocom/sigtran/sccp_sap.h> + +#include <openbsc/gprs_sgsn.h> + +#include "ranap_ies_defs.h" +#include "ranap_common_cn.h" +#include "hnbgw.h" + +int asn1_xer_print = 1; +void *talloc_asn1_ctx; + +struct ue_conn_ctx { + struct llist_head list; + struct osmo_sua_link *link; + uint32_t conn_id; +}; + +static LLIST_HEAD(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, &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, &conn_ctx_list, list) { + if (ctx->link == link && ctx->conn_id == conn_id) + return ctx; + } + return NULL; +} + +/*********************************************************************** + * RANAP handling + ***********************************************************************/ + +int gprs_iu_rab_act(struct sgsn_mm_ctx *mm, uint32_t gtp_ip, uint32_t gtp_tei) +{ + struct ue_conn_ctx *uectx; + struct osmo_scu_prim *prim; + struct msgb *msg; + + uectx = mm->iu.ue_ctx; + + msg = ranap_new_msg_rab_assign_data(1, gtp_ip, gtp_tei); + 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); +} + +int gprs_iu_rab_deact(struct sgsn_mm_ctx *mm) +{ + +} + +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; + gsm0408_gprs_rcvmsg_iu(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; + gsm0408_gprs_rcvmsg_iu(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 gprs_iu_tx(struct msgb *msg, uint8_t sapi, struct mm_context *mm) +{ + 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 i, 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, &ies->raB_SetupOrModifiedList); + if (item->transportLayerAddress) { + uint8_t rab_id = item->rAB_ID.buf[0]; + LOGPC(DRANAP, LOGL_INFO, " Setup: (%u/%s)", osmo_hexdump(item->transportLayerAddress->buf, + item->transportLayerAddress->size)); + } + } + + LOGPC(DRANAP, LOGL_INFO, "\n"); + + return rc; +} + +/* Entry point for connection-oriented ANAP message */ +int cn_ranap_handle_co(void *ctx, ranap_message *message) +{ + int rc = 0; + + 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; + } + 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 */ + break; + case RANAP_ProcedureCode_id_Iu_Release: + /* Iu Release Complete */ + break; + } + case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: + case RANAP_RANAP_PDU_PR_outcome: + default: + rc = -1; + break; + } + + return rc; +} + +static int ranap_handle_cl_reset_req(void *ctx, RANAP_ResetIEs_t *ies) +{ + /* FIXME: send reset response */ +} + +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 */ +int 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: + rc = -1; + break; + } +} + +/*********************************************************************** + * + ***********************************************************************/ + +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; + 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 = cn_ranap_rx_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 = cn_ranap_rx_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 = cn_ranap_rx_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 = cn_ranap_rx_cl(link, msgb_l2(oph->msg), msgb_l2len(oph->msg)); + break; + } + + msgb_free(oph->msg); + return 0; +} + +int sgsn_iu_init(void *ctx) +{ + struct osmo_sua_user *user; + int rc; + + talloc_asn1_ctx = talloc_named_const(ctx, 1, "asn1"); + + osmo_sua_set_log_area(DSUA); + + user = osmo_sua_user_create(ctx, sccp_sap_up, ctx); + + rc = osmo_sua_server_listen(user, "127.0.0.2", 14001); + if (rc < 0) { + exit(1); + } +} |