s1ap_eNB_nas_procedures.c 18.5 KB
Newer Older
Cedric Roux's avatar
 
Cedric Roux committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2013 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fr/openairinterface
  Address      : EURECOM, Campus SophiaTech, 450 Route des Chappes
                 06410 Biot FRANCE

*******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

35 36 37 38
#include "assertions.h"
#include "conversions.h"

#include "intertask_interface.h"
Cedric Roux's avatar
 
Cedric Roux committed
39 40 41 42

#include "s1ap_common.h"
#include "s1ap_eNB_defs.h"

Cedric Roux's avatar
Cedric Roux committed
43 44
#include "s1ap_eNB_itti_messaging.h"

45
#include "s1ap_ies_defs.h"
Cedric Roux's avatar
 
Cedric Roux committed
46
#include "s1ap_eNB_encoder.h"
Cedric Roux's avatar
Cedric Roux committed
47
#include "s1ap_eNB_nnsf.h"
48
#include "s1ap_eNB_ue_context.h"
Cedric Roux's avatar
 
Cedric Roux committed
49
#include "s1ap_eNB_nas_procedures.h"
Cedric Roux's avatar
Cedric Roux committed
50 51
#include "s1ap_eNB_management_procedures.h"

52 53
int s1ap_eNB_handle_nas_first_req(
    instance_t instance, s1ap_nas_first_req_t *s1ap_nas_first_req_p)
Cedric Roux's avatar
Cedric Roux committed
54 55
{
    s1ap_eNB_instance_t          *instance_p;
Cedric Roux's avatar
Cedric Roux committed
56
    struct s1ap_eNB_mme_data_s   *mme_desc_p = NULL;
Cedric Roux's avatar
Cedric Roux committed
57 58
    struct s1ap_eNB_ue_context_s *ue_desc_p;

59 60 61
    s1ap_message message;

    S1ap_InitialUEMessageIEs_t *initial_ue_message_p;
Cedric Roux's avatar
Cedric Roux committed
62 63 64 65 66 67 68

    uint8_t  *buffer;
    uint32_t  length;

    DevAssert(s1ap_nas_first_req_p != NULL);

    /* Retrieve the S1AP eNB instance associated with Mod_id */
69
    instance_p = s1ap_eNB_get_instance(instance);
Cedric Roux's avatar
Cedric Roux committed
70 71 72
    DevAssert(instance_p != NULL);

    memset(&message, 0, sizeof(s1ap_message));
Cedric Roux's avatar
 
Cedric Roux committed
73

74 75
    message.direction     = S1AP_PDU_PR_initiatingMessage;
    message.procedureCode = S1ap_ProcedureCode_id_initialUEMessage;
Cedric Roux's avatar
Cedric Roux committed
76

77
    initial_ue_message_p = &message.msg.s1ap_InitialUEMessageIEs;
Cedric Roux's avatar
Cedric Roux committed
78

winckel's avatar
RRC:  
winckel committed
79 80
    /* Select the MME corresponding to the provided GUMMEI. */
    if (s1ap_nas_first_req_p->ue_identity.presenceMask & UE_IDENTITIES_gummei) {
Cedric Roux's avatar
Cedric Roux committed
81 82 83
        mme_desc_p = s1ap_eNB_nnsf_select_mme_by_gummei(
            instance_p,
            s1ap_nas_first_req_p->establishment_cause,
winckel's avatar
RRC:  
winckel committed
84
            s1ap_nas_first_req_p->ue_identity.gummei);
Cedric Roux's avatar
Cedric Roux committed
85
    }
winckel's avatar
RRC:  
winckel committed
86

Cedric Roux's avatar
Cedric Roux committed
87
    if (mme_desc_p == NULL) {
winckel's avatar
RRC:  
winckel committed
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
        /* Select the MME corresponding to the provided s-TMSI. */
        if (s1ap_nas_first_req_p->ue_identity.presenceMask & UE_IDENTITIES_s_tmsi) {
            mme_desc_p = s1ap_eNB_nnsf_select_mme_by_mme_code(
                instance_p,
                s1ap_nas_first_req_p->establishment_cause,
                s1ap_nas_first_req_p->ue_identity.s_tmsi.mme_code);
        }
    }

    if (mme_desc_p == NULL) {
        /*
         * If no MME corresponds to the GUMMEI or the s-TMSI, selects the MME with the
         * highest capacity.
         */
        mme_desc_p = s1ap_eNB_nnsf_select_mme(
                        instance_p,
                        s1ap_nas_first_req_p->establishment_cause);
    }

    if (mme_desc_p == NULL) {
        /*
         * In case eNB has no MME associated, the eNB should inform RRC and discard
         * this request.
         */

Cedric Roux's avatar
Cedric Roux committed
113 114 115 116 117 118 119 120 121 122 123 124
        S1AP_WARN("No MME is associated to the eNB\n");
        // TODO: Inform RRC
        return -1;
    }

    /* The eNB should allocate a unique eNB UE S1AP ID for this UE. The value
     * will be used for the duration of the connectivity.
     */
    ue_desc_p = s1ap_eNB_allocate_new_UE_context();
    DevAssert(ue_desc_p != NULL);

    /* Keep a reference to the selected MME */
125 126 127
    ue_desc_p->mme_ref       = mme_desc_p;
    ue_desc_p->ue_initial_id = s1ap_nas_first_req_p->ue_initial_id;
    ue_desc_p->eNB_instance  = instance_p;
Cedric Roux's avatar
Cedric Roux committed
128 129 130 131 132 133 134

    do {
        struct s1ap_eNB_ue_context_s *collision_p;

        /* Peek a random value for the eNB_ue_s1ap_id */
        ue_desc_p->eNB_ue_s1ap_id = (random() + random()) & 0x00ffffff;
        if ((collision_p = RB_INSERT(s1ap_ue_map, &instance_p->s1ap_ue_head, ue_desc_p))
135 136 137
                == NULL)
        {
            S1AP_DEBUG("Found usable eNB_ue_s1ap_id: 0x%06x\n", ue_desc_p->eNB_ue_s1ap_id);
Cedric Roux's avatar
Cedric Roux committed
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
            /* Break the loop as the id is not already used by another UE */
            break;
        }
    } while(1);

    initial_ue_message_p->eNB_UE_S1AP_ID = ue_desc_p->eNB_ue_s1ap_id;
    /* Prepare the NAS PDU */
    initial_ue_message_p->nas_pdu.buf  = s1ap_nas_first_req_p->nas_pdu.buffer;
    initial_ue_message_p->nas_pdu.size = s1ap_nas_first_req_p->nas_pdu.length;

    /* Set the establishment cause according to those provided by RRC */
    DevCheck(s1ap_nas_first_req_p->establishment_cause < RRC_CAUSE_LAST,
             s1ap_nas_first_req_p->establishment_cause, RRC_CAUSE_LAST, 0);
    initial_ue_message_p->rrC_Establishment_Cause = s1ap_nas_first_req_p->establishment_cause;

winckel's avatar
RRC:  
winckel committed
153
    if (s1ap_nas_first_req_p->ue_identity.presenceMask & UE_IDENTITIES_s_tmsi) {
154
        initial_ue_message_p->presenceMask |= S1AP_INITIALUEMESSAGEIES_S_TMSI_PRESENT;
Cedric Roux's avatar
Cedric Roux committed
155

winckel's avatar
RRC:  
winckel committed
156
        MME_CODE_TO_OCTET_STRING(s1ap_nas_first_req_p->ue_identity.s_tmsi.mme_code,
Cedric Roux's avatar
Cedric Roux committed
157
                                 &initial_ue_message_p->s_tmsi.mMEC);
winckel's avatar
RRC:  
winckel committed
158
        M_TMSI_TO_OCTET_STRING(s1ap_nas_first_req_p->ue_identity.s_tmsi.m_tmsi,
Cedric Roux's avatar
Cedric Roux committed
159
                               &initial_ue_message_p->s_tmsi.m_TMSI);
winckel's avatar
RRC:  
winckel committed
160 161
    }
    if (s1ap_nas_first_req_p->ue_identity.presenceMask & UE_IDENTITIES_gummei) {
162
        initial_ue_message_p->presenceMask |= S1AP_INITIALUEMESSAGEIES_GUMMEI_ID_PRESENT;
Cedric Roux's avatar
Cedric Roux committed
163

winckel's avatar
RRC:  
winckel committed
164 165
        MCC_MNC_TO_PLMNID(s1ap_nas_first_req_p->ue_identity.gummei.mcc,
                          s1ap_nas_first_req_p->ue_identity.gummei.mnc,
Cedric Roux's avatar
Cedric Roux committed
166
                          &initial_ue_message_p->gummei_id.pLMN_Identity);
winckel's avatar
RRC:  
winckel committed
167
        MME_GID_TO_OCTET_STRING(s1ap_nas_first_req_p->ue_identity.gummei.mme_group_id,
Cedric Roux's avatar
Cedric Roux committed
168
                                &initial_ue_message_p->gummei_id.mME_Group_ID);
winckel's avatar
RRC:  
winckel committed
169
        MME_CODE_TO_OCTET_STRING(s1ap_nas_first_req_p->ue_identity.gummei.mme_code,
Cedric Roux's avatar
Cedric Roux committed
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188
                                 &initial_ue_message_p->gummei_id.mME_Code);
    }

    /* Assuming TAI is the TAI from the cell */
    INT16_TO_OCTET_STRING(instance_p->tac, &initial_ue_message_p->tai.tAC);
    MCC_MNC_TO_PLMNID(instance_p->mcc, instance_p->mnc,
                      &initial_ue_message_p->tai.pLMNidentity);

    /* Set the EUTRAN CGI
     * The cell identity is defined on 28 bits but as we use macro enb id,
     * we have to pad.
     */
    MACRO_ENB_ID_TO_CELL_IDENTITY(instance_p->eNB_id,
                                  &initial_ue_message_p->eutran_cgi.cell_ID);
    MCC_MNC_TO_TBCD(instance_p->mcc, instance_p->mnc,
                    &initial_ue_message_p->eutran_cgi.pLMNidentity);

    if (s1ap_eNB_encode_pdu(&message, &buffer, &length) < 0) {
        /* Failed to encode message */
189
        DevMessage("Failed to encode initial UE message\n");
Cedric Roux's avatar
Cedric Roux committed
190 191 192 193 194
    }

    /* Update the current S1AP UE state */
    ue_desc_p->ue_state = S1AP_UE_WAITING_CSR;

195 196 197 198
    /* Assign a stream for this UE */
    mme_desc_p->nextstream %= mme_desc_p->out_streams;
    ue_desc_p->stream = ++mme_desc_p->nextstream;

Cedric Roux's avatar
Cedric Roux committed
199
    /* Send encoded message over sctp */
200 201
    s1ap_eNB_itti_send_sctp_data_req(instance_p->instance, mme_desc_p->assoc_id,
                                     buffer, length, ue_desc_p->stream);
Cedric Roux's avatar
Cedric Roux committed
202 203 204

    return 0;
}
Cedric Roux's avatar
 
Cedric Roux committed
205

206 207
int s1ap_eNB_handle_nas_downlink(uint32_t               assoc_id,
                                 uint32_t               stream,
Cedric Roux's avatar
 
Cedric Roux committed
208 209
                                 struct s1ap_message_s *message_p)
{
210 211 212 213 214
    S1ap_DownlinkNASTransportIEs_t *downlink_NAS_transport_p;

    s1ap_eNB_mme_data_t   *mme_desc_p;
    s1ap_eNB_ue_context_t *ue_desc_p;
    s1ap_eNB_instance_t   *s1ap_eNB_instance;
Cedric Roux's avatar
 
Cedric Roux committed
215 216 217

    DevAssert(message_p != NULL);

218
    downlink_NAS_transport_p = &message_p->msg.s1ap_DownlinkNASTransportIEs;
Cedric Roux's avatar
 
Cedric Roux committed
219 220

    /* UE-related procedure -> stream != 0 */
221 222 223
    if (stream == 0) {
        S1AP_ERROR("[SCTP %d] Received UE-related procedure on stream == 0\n",
                   assoc_id);
Cedric Roux's avatar
 
Cedric Roux committed
224 225 226
        return -1;
    }

Cedric Roux's avatar
Cedric Roux committed
227
    if ((mme_desc_p = s1ap_eNB_get_MME(NULL, assoc_id, 0)) == NULL) {
228
        S1AP_ERROR("[SCTP %d] Received NAS downlink message for non "
Cedric Roux's avatar
Cedric Roux committed
229 230 231 232 233 234 235 236 237
                   "existing MME context\n", assoc_id);
        return -1;
    }

    s1ap_eNB_instance = mme_desc_p->s1ap_eNB_instance;

    if ((ue_desc_p = s1ap_eNB_get_ue_context(s1ap_eNB_instance,
         downlink_NAS_transport_p->eNB_UE_S1AP_ID)) == NULL)
    {
238 239 240
        S1AP_ERROR("[SCTP %d] Received NAS downlink message for non "
        "existing UE context: %06x\n", assoc_id,
        downlink_NAS_transport_p->eNB_UE_S1AP_ID);
Cedric Roux's avatar
Cedric Roux committed
241 242
        return -1;
    }
Cedric Roux's avatar
 
Cedric Roux committed
243 244 245 246

    /* Is it the first outcome of the MME for this UE ? If so store the mme
     * UE s1ap id.
     */
Cedric Roux's avatar
Cedric Roux committed
247 248 249 250 251
    if (ue_desc_p->mme_ue_s1ap_id == 0) {
        ue_desc_p->mme_ue_s1ap_id = downlink_NAS_transport_p->mme_ue_s1ap_id;
    } else {
        /* We already have a mme ue s1ap id check the received is the same */
        if (ue_desc_p->mme_ue_s1ap_id != downlink_NAS_transport_p->mme_ue_s1ap_id) {
252
            S1AP_ERROR("[SCTP %d] Mismatch in MME UE S1AP ID (0x%08x != 0x%08x)\n",
Cedric Roux's avatar
Cedric Roux committed
253 254 255 256 257
                       downlink_NAS_transport_p->mme_ue_s1ap_id,
                       ue_desc_p->mme_ue_s1ap_id,
                       assoc_id);
        }
    }
Cedric Roux's avatar
 
Cedric Roux committed
258

Cedric Roux's avatar
Cedric Roux committed
259
    /* Forward the NAS PDU to RRC */
260
    s1ap_eNB_itti_send_nas_downlink_ind(s1ap_eNB_instance->instance,
Cedric Roux's avatar
Cedric Roux committed
261 262
                                        downlink_NAS_transport_p->nas_pdu.buf,
                                        downlink_NAS_transport_p->nas_pdu.size);
Cedric Roux's avatar
 
Cedric Roux committed
263 264 265 266

    return 0;
}

267
int s1ap_eNB_nas_uplink(instance_t instance, s1ap_uplink_nas_t *s1ap_uplink_nas_p)
Cedric Roux's avatar
Cedric Roux committed
268 269 270
{
    struct s1ap_eNB_ue_context_s *ue_context_p;
    s1ap_eNB_instance_t          *s1ap_eNB_instance_p;
271
    S1ap_UplinkNASTransportIEs_t *uplink_NAS_transport_p;
Cedric Roux's avatar
Cedric Roux committed
272 273 274 275 276 277 278 279 280

    s1ap_message  message;

    uint8_t  *buffer;
    uint32_t length;

    DevAssert(s1ap_uplink_nas_p != NULL);

    /* Retrieve the S1AP eNB instance associated with Mod_id */
281
    s1ap_eNB_instance_p = s1ap_eNB_get_instance(instance);
Cedric Roux's avatar
Cedric Roux committed
282 283 284 285 286
    DevAssert(s1ap_eNB_instance_p != NULL);

    if ((ue_context_p = s1ap_eNB_get_ue_context(s1ap_eNB_instance_p, s1ap_uplink_nas_p->eNB_ue_s1ap_id)) == NULL)
    {
        /* The context for this eNB ue s1ap id doesn't exist in the map of eNB UEs */
287
        S1AP_WARN("Failed to find ue context associated with eNB ue s1ap id: %06x\n",
Cedric Roux's avatar
Cedric Roux committed
288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
                  s1ap_uplink_nas_p->eNB_ue_s1ap_id);
        return -1;
    }

    /* Uplink NAS transport can occur either during an s1ap connected state
     * or during initial attach (for example: NAS authentication).
     */
    if (!(ue_context_p->ue_state == S1AP_UE_CONNECTED ||
        ue_context_p->ue_state == S1AP_UE_WAITING_CSR))
    {
        S1AP_WARN("You are attempting to send NAS data over non-connected "
                  "eNB ue s1ap id: %u, current state: %d\n",
                  s1ap_uplink_nas_p->eNB_ue_s1ap_id, ue_context_p->ue_state);
        return -1;
    }

    /* Prepare the S1AP message to encode */
    memset(&message, 0, sizeof(s1ap_message));

307 308
    message.direction     = S1AP_PDU_PR_initiatingMessage;
    message.procedureCode = S1ap_ProcedureCode_id_uplinkNASTransport;
Cedric Roux's avatar
Cedric Roux committed
309

310
    uplink_NAS_transport_p = &message.msg.s1ap_UplinkNASTransportIEs;
Cedric Roux's avatar
Cedric Roux committed
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334

    uplink_NAS_transport_p->mme_ue_s1ap_id = ue_context_p->mme_ue_s1ap_id;
    uplink_NAS_transport_p->eNB_UE_S1AP_ID = ue_context_p->eNB_ue_s1ap_id;

    uplink_NAS_transport_p->nas_pdu.buf  = s1ap_uplink_nas_p->nas_pdu.buffer;
    uplink_NAS_transport_p->nas_pdu.size = s1ap_uplink_nas_p->nas_pdu.length;

    MCC_MNC_TO_PLMNID(s1ap_eNB_instance_p->mcc, s1ap_eNB_instance_p->mnc,
                      &uplink_NAS_transport_p->eutran_cgi.pLMNidentity);
    MACRO_ENB_ID_TO_CELL_IDENTITY(s1ap_eNB_instance_p->eNB_id,
                                  &uplink_NAS_transport_p->eutran_cgi.cell_ID);

    /* MCC/MNC should be repeated in TAI and EUTRAN CGI */
    MCC_MNC_TO_PLMNID(s1ap_eNB_instance_p->mcc, s1ap_eNB_instance_p->mnc,
                      &uplink_NAS_transport_p->tai.pLMNidentity);
    TAC_TO_ASN1(s1ap_eNB_instance_p->tac, &uplink_NAS_transport_p->tai.tAC);

    if (s1ap_eNB_encode_pdu(&message, &buffer, &length) < 0) {
        S1AP_ERROR("Failed to encode uplink NAS transport\n");
        /* Encode procedure has failed... */
        return -1;
    }

    /* UE associated signalling -> use the allocated stream */
335 336
    s1ap_eNB_itti_send_sctp_data_req(s1ap_eNB_instance_p->instance,
                                     ue_context_p->mme_ref->assoc_id, buffer,
Cedric Roux's avatar
Cedric Roux committed
337 338 339 340
                                     length, ue_context_p->stream);

    return 0;
}
341

342 343 344 345 346 347 348 349 350 351 352 353 354 355 356
int s1ap_eNB_initial_ctxt_resp(
    instance_t instance, s1ap_initial_context_setup_resp_t *initial_ctxt_resp_p)
{
    s1ap_eNB_instance_t          *s1ap_eNB_instance_p;
    struct s1ap_eNB_ue_context_s *ue_context_p;

    S1ap_InitialContextSetupResponseIEs_t *initial_ies_p;

    s1ap_message  message;

    uint8_t  *buffer;
    uint32_t length;
    int      ret = -1;
    int      i;

winckel's avatar
RRC:  
winckel committed
357 358 359
    /* Retrieve the S1AP eNB instance associated with Mod_id */
    s1ap_eNB_instance_p = s1ap_eNB_get_instance(instance);

360 361 362 363 364 365 366
    DevAssert(initial_ctxt_resp_p != NULL);
    DevAssert(s1ap_eNB_instance_p != NULL);

    if ((ue_context_p = s1ap_eNB_get_ue_context(s1ap_eNB_instance_p,
        initial_ctxt_resp_p->eNB_ue_s1ap_id)) == NULL)
    {
        /* The context for this eNB ue s1ap id doesn't exist in the map of eNB UEs */
367
        S1AP_WARN("Failed to find ue context associated with eNB ue s1ap id: 0x%06x\n",
368 369 370 371 372 373 374 375 376 377 378
                  initial_ctxt_resp_p->eNB_ue_s1ap_id);
        return -1;
    }

    /* Uplink NAS transport can occur either during an s1ap connected state
     * or during initial attach (for example: NAS authentication).
     */
    if (!(ue_context_p->ue_state == S1AP_UE_CONNECTED ||
        ue_context_p->ue_state == S1AP_UE_WAITING_CSR))
    {
        S1AP_WARN("You are attempting to send NAS data over non-connected "
379
                  "eNB ue s1ap id: %06x, current state: %d\n",
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
                  initial_ctxt_resp_p->eNB_ue_s1ap_id, ue_context_p->ue_state);
        return -1;
    }

    /* Prepare the S1AP message to encode */
    memset(&message, 0, sizeof(s1ap_message));

    message.direction     = S1AP_PDU_PR_successfulOutcome;
    message.procedureCode = S1ap_ProcedureCode_id_InitialContextSetup;

    initial_ies_p = &message.msg.s1ap_InitialContextSetupResponseIEs;

    initial_ies_p->eNB_UE_S1AP_ID = initial_ctxt_resp_p->eNB_ue_s1ap_id;
    initial_ies_p->mme_ue_s1ap_id = ue_context_p->mme_ue_s1ap_id;

    for (i = 0; i < initial_ctxt_resp_p->nb_of_e_rabs; i++)
    {
        S1ap_E_RABSetupItemCtxtSURes_t *new_item;

        new_item = calloc(1, sizeof(S1ap_E_RABSetupItemCtxtSURes_t));

        new_item->e_RAB_ID = initial_ctxt_resp_p->e_rabs[i].e_rab_id;
        GTP_TEID_TO_ASN1(initial_ctxt_resp_p->e_rabs[i].gtp_teid, &new_item->gTP_TEID);
        new_item->transportLayerAddress.buf = initial_ctxt_resp_p->e_rabs[i].eNB_addr.buffer;
        new_item->transportLayerAddress.size = initial_ctxt_resp_p->e_rabs[i].eNB_addr.length;
        new_item->transportLayerAddress.bits_unused = 0;

        ASN_SEQUENCE_ADD(&initial_ies_p->e_RABSetupListCtxtSURes.s1ap_E_RABSetupItemCtxtSURes,
                         new_item);
    }

411 412
    if (s1ap_eNB_encode_pdu(&message, &buffer, &length) < 0)
    {
413 414 415 416 417 418
        S1AP_ERROR("Failed to encode uplink NAS transport\n");
        /* Encode procedure has failed... */
        return -1;
    }

    /* UE associated signalling -> use the allocated stream */
419 420
    s1ap_eNB_itti_send_sctp_data_req(s1ap_eNB_instance_p->instance,
                                     ue_context_p->mme_ref->assoc_id, buffer,
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
                                     length, ue_context_p->stream);

    return ret;
}

int s1ap_eNB_ue_capabilities(instance_t instance,
                             s1ap_ue_cap_info_ind_t *ue_cap_info_ind_p)
{
    s1ap_eNB_instance_t          *s1ap_eNB_instance_p;
    struct s1ap_eNB_ue_context_s *ue_context_p;

    S1ap_UECapabilityInfoIndicationIEs_t *ue_cap_info_ind_ies_p;

    s1ap_message  message;

    uint8_t  *buffer;
    uint32_t length;
    int      ret = -1;

winckel's avatar
RRC:  
winckel committed
440 441 442
    /* Retrieve the S1AP eNB instance associated with Mod_id */
    s1ap_eNB_instance_p = s1ap_eNB_get_instance(instance);

443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487
    DevAssert(ue_cap_info_ind_p != NULL);
    DevAssert(s1ap_eNB_instance_p != NULL);

    if ((ue_context_p = s1ap_eNB_get_ue_context(s1ap_eNB_instance_p,
        ue_cap_info_ind_p->eNB_ue_s1ap_id)) == NULL)
    {
        /* The context for this eNB ue s1ap id doesn't exist in the map of eNB UEs */
        S1AP_WARN("Failed to find ue context associated with eNB ue s1ap id: %u\n",
                  ue_cap_info_ind_p->eNB_ue_s1ap_id);
        return -1;
    }

    /* UE capabilities message can occur either during an s1ap connected state
     * or during initial attach (for example: NAS authentication).
     */
    if (!(ue_context_p->ue_state == S1AP_UE_CONNECTED ||
        ue_context_p->ue_state == S1AP_UE_WAITING_CSR))
    {
        S1AP_WARN("You are attempting to send NAS data over non-connected "
        "eNB ue s1ap id: %u, current state: %d\n",
        ue_cap_info_ind_p->eNB_ue_s1ap_id, ue_context_p->ue_state);
        return -1;
    }

    /* Prepare the S1AP message to encode */
    memset(&message, 0, sizeof(s1ap_message));

    message.direction     = S1AP_PDU_PR_initiatingMessage;
    message.procedureCode = S1ap_ProcedureCode_id_UECapabilityInfoIndication;

    ue_cap_info_ind_ies_p = &message.msg.s1ap_UECapabilityInfoIndicationIEs;

    ue_cap_info_ind_ies_p->ueRadioCapability.buf = ue_cap_info_ind_p->ue_radio_cap.buffer;
    ue_cap_info_ind_ies_p->ueRadioCapability.size = ue_cap_info_ind_p->ue_radio_cap.length;

    ue_cap_info_ind_ies_p->eNB_UE_S1AP_ID = ue_cap_info_ind_p->eNB_ue_s1ap_id;
    ue_cap_info_ind_ies_p->mme_ue_s1ap_id = ue_context_p->mme_ue_s1ap_id;

    if (s1ap_eNB_encode_pdu(&message, &buffer, &length) < 0) {
        /* Encode procedure has failed... */
        S1AP_ERROR("Failed to encode UE capabilities indication\n");
        return -1;
    }

    /* UE associated signalling -> use the allocated stream */
488 489
    s1ap_eNB_itti_send_sctp_data_req(s1ap_eNB_instance_p->instance,
                                     ue_context_p->mme_ref->assoc_id, buffer,
490 491 492 493
                                     length, ue_context_p->stream);

    return ret;
}