esm_ebr_context.c 27.6 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

gauthier's avatar
   
gauthier committed
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
/*****************************************************************************
Source      esm_ebr_context.h

Version     0.1

Date        2013/05/28

Product     NAS stack

Subsystem   EPS Session Management

Author      Frederic Maurel

Description Defines functions used to handle EPS bearer contexts.

*****************************************************************************/
#include <stdlib.h> // malloc, free
#include <string.h> // memset

#include "commonDef.h"
#include "nas_log.h"

#include "emmData.h"
#include "esm_ebr.h"

#include "esm_ebr_context.h"

#include "emm_sap.h"

#if defined(ENABLE_ITTI)
# include "assertions.h"
#endif


#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>


/****************************************************************************/
/****************  E X T E R N A L    D E F I N I T I O N S  ****************/
/****************************************************************************/

/****************************************************************************/
/*******************  L O C A L    D E F I N I T I O N S  *******************/
/****************************************************************************/

static int _esm_ebr_context_check_identifiers(const network_tft_t *,
    const network_tft_t *);
static int _esm_ebr_context_check_precedence(const network_tft_t *,
    const network_tft_t *);

/****************************************************************************/
/******************  E X P O R T E D    F U N C T I O N S  ******************/
/****************************************************************************/

/****************************************************************************
 **                                                                        **
 ** Name:    esm_ebr_context_create()                                  **
 **                                                                        **
 ** Description: Creates a new EPS bearer context to the PDN with the spe- **
 **      cified PDN connection identifier                          **
 **                                                                        **
85
 ** Inputs: **
gauthier's avatar
   
gauthier committed
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
 **      pid:       PDN connection identifier                  **
 **      ebi:       EPS bearer identity                        **
 **      is_default:    TRUE if the new bearer is a default EPS    **
 **             bearer context                             **
 **      esm_qos:   EPS bearer level QoS parameters            **
 **      tft:       Traffic flow template parameters           **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    The EPS bearer identity of the default EPS **
 **             bearer associated to the new EPS bearer    **
 **             context if successfully created;           **
 **             UNASSIGN EPS bearer value otherwise.       **
 **                                                                        **
 ***************************************************************************/
int esm_ebr_context_create(
101
  esm_data_t *esm_data, int ueid,
gauthier's avatar
   
gauthier committed
102
103
104
105
106
107
108
109
110
  int pid, int ebi, int is_default,
  const network_qos_t *qos, const network_tft_t *tft)
{
  int                 bid     = 0;
  esm_data_context_t *esm_ctx = NULL;
  esm_pdn_t          *pdn     = NULL;

  LOG_FUNC_IN;

111
  esm_ctx = esm_data;
gauthier's avatar
   
gauthier committed
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204

  bid = ESM_DATA_EPS_BEARER_MAX;

  LOG_TRACE(INFO, "ESM-PROC  - Create new %s EPS bearer context (ebi=%d) "
            "for PDN connection (pid=%d)",
            (is_default)? "default" : "dedicated", ebi, pid);

  if (pid < ESM_DATA_PDN_MAX) {
    if (pid != esm_ctx->pdn[pid].pid) {
      LOG_TRACE(ERROR, "ESM-PROC  - PDN connection identifier %d is "
                "not valid", pid);
    } else if (esm_ctx->pdn[pid].data == NULL) {
      LOG_TRACE(ERROR, "ESM-PROC  - PDN connection %d has not been "
                "allocated", pid);
    }
    /* Check the total number of active EPS bearers */
    else if (esm_ctx->n_ebrs > ESM_DATA_EPS_BEARER_TOTAL) {
      LOG_TRACE(WARNING, "ESM-PROC  - The total number of active EPS"
                "bearers is exceeded");
    } else {
      /* Get the PDN connection entry */
      pdn = esm_ctx->pdn[pid].data;

      if (is_default) {
        /* Default EPS bearer entry is defined at index 0 */
        bid = 0;

        if (pdn->bearer[bid] != NULL) {
          LOG_TRACE(ERROR, "ESM-PROC  - A default EPS bearer context "
                    "is already allocated");
          LOG_FUNC_RETURN (ESM_EBI_UNASSIGNED);
        }
      } else {
        /* Search for an available EPS bearer context entry */
        for (bid = 1; bid < ESM_DATA_EPS_BEARER_MAX; bid++) {
          if (pdn->bearer[bid] != NULL) {
            continue;
          }

          break;
        }
      }
    }
  }

  if (bid < ESM_DATA_EPS_BEARER_MAX) {
    /* Create new EPS bearer context */
    esm_bearer_t *ebr = (esm_bearer_t *)malloc(sizeof(esm_bearer_t));

    if (ebr != NULL) {
      memset(ebr, 0 , sizeof(esm_bearer_t));
      /* Increment the total number of active EPS bearers */
      esm_ctx->n_ebrs += 1;
      /* Increment the number of EPS bearer for this PDN connection */
      pdn->n_bearers += 1;
      /* Setup the EPS bearer data */
      pdn->bearer[bid] = ebr;
      ebr->bid = bid;
      ebr->ebi = ebi;

      if (qos != NULL) {
        /* EPS bearer level QoS parameters */
        ebr->qos = *qos;
      }

      if ( (tft != NULL) && (tft->n_pkfs < NET_PACKET_FILTER_MAX) ) {
        int i;

        /* Traffic flow template parameters */
        for (i = 0; i < tft->n_pkfs; i++) {
          ebr->tft.pkf[i] =
            (network_pkf_t *)malloc(sizeof(network_pkf_t));

          if (ebr->tft.pkf[i] != NULL) {
            *(ebr->tft.pkf[i]) = *(tft->pkf[i]);
            ebr->tft.n_pkfs += 1;
          }
        }
      }

      if (is_default) {
        /* Set the PDN connection activation indicator */
        esm_ctx->pdn[pid].is_active = TRUE;

        /* Update the emergency bearer services indicator */
        if (pdn->is_emergency) {
          esm_ctx->emergency = TRUE;
        }

        // LG ADD TEMP
        {
           char          *tmp          = NULL;
           char           ipv4_addr[INET_ADDRSTRLEN];
205
           //char           ipv6_addr[INET6_ADDRSTRLEN];
gauthier's avatar
   
gauthier committed
206
207
208
           char          *netmask      = NULL;
           char           broadcast[INET_ADDRSTRLEN];
           struct in_addr in_addr;
209
           char           command_line[500];
gauthier's avatar
   
gauthier committed
210
211
212
213
           int            res;

           switch (pdn->type) {
           case NET_PDN_TYPE_IPV4V6:
214
215
             //ipv6_addr[0] = pdn->ip_addr[4];
             /* TODO? */
gauthier's avatar
   
gauthier committed
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274

             // etc
           case NET_PDN_TYPE_IPV4:
             // in_addr is in network byte order
             in_addr.s_addr  = pdn->ip_addr[0] << 24                 |
                               ((pdn->ip_addr[1] << 16) & 0x00FF0000) |
                               ((pdn->ip_addr[2] <<  8) & 0x0000FF00) |
                               ( pdn->ip_addr[3]        & 0x000000FF);

             in_addr.s_addr = htonl(in_addr.s_addr);

             tmp = inet_ntoa(in_addr);
             //AssertFatal(tmp ,
             //            "error in PDN IPv4 address %x",
             //            in_addr.s_addr);
             strcpy(ipv4_addr, tmp);

             if (IN_CLASSA(ntohl(in_addr.s_addr))) {
               netmask = "255.0.0.0";
               in_addr.s_addr = pdn->ip_addr[0] << 24 |
                                ((255  << 16) & 0x00FF0000) |
                                ((255 <<  8)  & 0x0000FF00) |
                                ( 255         & 0x000000FF);
               in_addr.s_addr = htonl(in_addr.s_addr);
               tmp = inet_ntoa(in_addr);
               //                                AssertFatal(tmp ,
               //                                        "error in PDN IPv4 address %x",
               //                                        in_addr.s_addr);
               strcpy(broadcast, tmp);
             } else if (IN_CLASSB(ntohl(in_addr.s_addr))) {
               netmask = "255.255.0.0";
               in_addr.s_addr =  pdn->ip_addr[0] << 24 |
                                 ((pdn->ip_addr[1] << 16) & 0x00FF0000) |
                                 ((255 <<  8)  & 0x0000FF00) |
                                 ( 255         & 0x000000FF);
               in_addr.s_addr = htonl(in_addr.s_addr);
               tmp = inet_ntoa(in_addr);
               //                                AssertFatal(tmp ,
               //                                        "error in PDN IPv4 address %x",
               //                                        in_addr.s_addr);
               strcpy(broadcast, tmp);
             } else if (IN_CLASSC(ntohl(in_addr.s_addr))) {
               netmask = "255.255.255.0";
               in_addr.s_addr = pdn->ip_addr[0] << 24 |
                                ((pdn->ip_addr[1] << 16) & 0x00FF0000) |
                                ((pdn->ip_addr[2] <<  8) & 0x0000FF00) |
                                ( 255         & 0x000000FF);
               in_addr.s_addr = htonl(in_addr.s_addr);
               tmp = inet_ntoa(in_addr);
               //                                AssertFatal(tmp ,
               //                                        "error in PDN IPv4 address %x",
               //                                        in_addr.s_addr);
               strcpy(broadcast, tmp);
             } else {
               netmask = "255.255.255.255";
               strcpy(broadcast, ipv4_addr);
             }

             res = sprintf(command_line,
275
276
277
278
279
280
281
282
283
284
285
                           "ifconfig oip%d %s netmask %s broadcast %s up && "
                           "ip rule add from %s/32 table %d && "
                           "ip rule add to %s/32 table %d && "
                           "ip route add default dev oip%d table %d",
                           ueid + 1, ipv4_addr, netmask, broadcast,
                           ipv4_addr, ueid + 201,
                           ipv4_addr, ueid + 201,
                           ueid + 1, ueid + 201);
             if ( res<0 ) {
                LOG_TRACE(WARNING, "ESM-PROC  - Failed to system command string");
             }
gauthier's avatar
   
gauthier committed
286
287
             LOG_TRACE(INFO, "ESM-PROC  - executing %s ",
                       command_line);
288

Bilel's avatar
Bilel committed
289
             if (system(command_line)) ; /* TODO: what to do? */
290

gauthier's avatar
   
gauthier committed
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
             break;

           case NET_PDN_TYPE_IPV6:
             break;

           default:
             break;
           }
         }
         //                AssertFatal(0, "Forced stop in NAS UE");
      }

      /* Return the EPS bearer identity of the default EPS bearer
       * associated to the new EPS bearer context */
      LOG_FUNC_RETURN (pdn->bearer[0]->ebi);
    }

    LOG_TRACE(WARNING, "ESM-PROC  - Failed to create new EPS bearer "
              "context (ebi=%d)", ebi);
  }

  LOG_FUNC_RETURN (ESM_EBI_UNASSIGNED);
}

/****************************************************************************
 **                                                                        **
 ** Name:    esm_ebr_context_release()                                 **
 **                                                                        **
 ** Description: Releases EPS bearer context entry previously allocated    **
 **      to the EPS bearer with the specified EPS bearer identity  **
 **                                                                        **
322
 ** Inputs:   **
gauthier's avatar
   
gauthier committed
323
324
325
326
327
328
329
330
331
332
333
 **      ebi:       EPS bearer identity                        **
 **                                                                        **
 ** Outputs:     pid:       Identifier of the PDN connection entry the **
 **             EPS bearer context belongs to              **
 **      bid:       Identifier of the released EPS bearer con- **
 **             text entry                                 **
 **      Return:    The EPS bearer identity associated to the  **
 **             EPS bearer context if successfully relea-  **
 **             sed; UNASSIGN EPS bearer value otherwise.  **
 **                                                                        **
 ***************************************************************************/
334
int esm_ebr_context_release(nas_user_t *user,
gauthier's avatar
   
gauthier committed
335
336
337
338
339
  int ebi, int *pid, int *bid)
{
  int found = FALSE;
  esm_pdn_t *pdn = NULL;
  esm_data_context_t *esm_ctx;
340
341
  esm_ebr_data_t *esm_ebr_data = user->esm_ebr_data;
  user_api_id_t *user_api_id = user->user_api_id;
gauthier's avatar
   
gauthier committed
342
343
344

  LOG_FUNC_IN;

345
  esm_ctx = user->esm_data;
gauthier's avatar
   
gauthier committed
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
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
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458

  if (ebi != ESM_EBI_UNASSIGNED) {
    /*
     * The identity of the EPS bearer to released is given;
     * Release the EPS bearer context entry that match the specified EPS
     * bearer identity
     */

    /* Search for active PDN connection */
    for (*pid = 0; *pid < ESM_DATA_PDN_MAX; (*pid)++) {
      if ( !esm_ctx->pdn[*pid].is_active ) {
        continue;
      }

      /* An active PDN connection is found */
      if (esm_ctx->pdn[*pid].data != NULL) {
        pdn = esm_ctx->pdn[*pid].data;

        /* Search for the specified EPS bearer context entry */
        for (*bid = 0; *bid < pdn->n_bearers; (*bid)++) {
          if (pdn->bearer[*bid] != NULL) {
            if (pdn->bearer[*bid]->ebi != ebi) {
              continue;
            }

            /* The EPS bearer context entry is found */
            found = TRUE;
            break;
          }
        }
      }

      if (found) {
        break;
      }
    }
  } else {
    /*
     * The identity of the EPS bearer to released is not given;
     * Release the EPS bearer context entry allocated with the EPS
     * bearer context identifier (bid) to establish connectivity to
     * the PDN identified by the PDN connection identifier (pid).
     * Default EPS bearer to a given PDN is always identified by the
     * first EPS bearer context entry at index bid = 0
     */
    if (*pid < ESM_DATA_PDN_MAX) {
      if (*pid != esm_ctx->pdn[*pid].pid) {
        LOG_TRACE(ERROR, "ESM-PROC  - PDN connection identifier %d "
                  "is not valid", *pid);
      } else if (!esm_ctx->pdn[*pid].is_active) {
        LOG_TRACE(WARNING,"ESM-PROC  - PDN connection %d is not active",
                  *pid);
      } else if (esm_ctx->pdn[*pid].data == NULL) {
        LOG_TRACE(ERROR, "ESM-PROC  - PDN connection %d has not been "
                  "allocated", *pid);
      } else {
        pdn = esm_ctx->pdn[*pid].data;

        if (pdn->bearer[*bid] != NULL) {
          ebi = pdn->bearer[*bid]->ebi;
          found = TRUE;
        }
      }
    }
  }

  if (found) {
    int i, j;

    /*
     * Delete the specified EPS bearer context entry
     */
    if (pdn->bearer[*bid]->bid != *bid) {
      LOG_TRACE(ERROR, "ESM-PROC  - EPS bearer identifier %d is "
                "not valid", *bid);
      LOG_FUNC_RETURN (ESM_EBI_UNASSIGNED);
    }

    LOG_TRACE(WARNING, "ESM-PROC  - Release EPS bearer context "
              "(ebi=%d)", ebi);

    /* Delete the TFT */
    for (i = 0; i < pdn->bearer[*bid]->tft.n_pkfs; i++) {
      free(pdn->bearer[*bid]->tft.pkf[i]);
    }

    /* Release the specified EPS bearer data */
    free(pdn->bearer[*bid]);
    pdn->bearer[*bid] = NULL;
    /* Decrement the number of EPS bearer context allocated
     * to the PDN connection */
    pdn->n_bearers -= 1;
    /* Decrement the total number of active EPS bearers */
    esm_ctx->n_ebrs -= 1;

    if (*bid == 0) {
      /* 3GPP TS 24.301, section 6.4.4.3, 6.4.4.6
       * If the EPS bearer identity is that of the default bearer to a
       * PDN, the UE shall delete all EPS bearer contexts associated to
       * that PDN connection.
       */
      for (i = 1; pdn->n_bearers > 0; i++) {
        if (pdn->bearer[i]) {

          LOG_TRACE(WARNING, "ESM-PROC  - Release EPS bearer context "
                    "(ebi=%d)", pdn->bearer[i]->ebi);

          /* Delete the TFT */
          for (j = 0; j < pdn->bearer[i]->tft.n_pkfs; j++) {
            free(pdn->bearer[i]->tft.pkf[j]);
          }

          /* Set the EPS bearer context state to INACTIVE */
459
          esm_ebr_set_status(user_api_id, esm_ebr_data, pdn->bearer[i]->ebi,
gauthier's avatar
   
gauthier committed
460
461
462
                                    ESM_EBR_INACTIVE, TRUE);

          /* Release EPS bearer data */
463
          esm_ebr_release(esm_ebr_data, pdn->bearer[i]->ebi);
gauthier's avatar
   
gauthier committed
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494

          // esm_ebr_release()
          /* Release dedicated EPS bearer data */
          free(pdn->bearer[i]);
          pdn->bearer[i] = NULL;
          /* Decrement the number of EPS bearer context allocated
           * to the PDN connection */
          pdn->n_bearers -= 1;
          /* Decrement the total number of active EPS bearers */
          esm_ctx->n_ebrs -= 1;
        }
      }

      /* Reset the PDN connection activation indicator */
      esm_ctx->pdn[*pid].is_active = FALSE;

      /* Update the emergency bearer services indicator */
      if (pdn->is_emergency) {
        esm_ctx->emergency = FALSE;
      }
    }


    /* 3GPP TS 24.301, section 6.4.4.6
     * If the UE locally deactivated all EPS bearer contexts, the UE
     * shall perform a local detach and enter state EMM-DEREGISTERED.
     */
    if (esm_ctx->n_ebrs == 0) {
      emm_sap_t emm_sap;
      emm_sap.primitive = EMMESM_ESTABLISH_CNF;
      emm_sap.u.emm_esm.u.establish.is_attached = FALSE;
495
      (void) emm_sap_send(user, &emm_sap);
gauthier's avatar
   
gauthier committed
496
497
498
499
500
501
502
503
504
505
506
507
    }
    /* 3GPP TS 24.301, section 6.4.4.3, 6.4.4.6
     * If due to the EPS bearer context deactivation only the PDN
     * connection for emergency bearer services remains established,
     * the UE shall consider itself attached for emergency bearer
     * services only.
     */
    else if (esm_ctx->emergency && (esm_ctx->n_ebrs == 1) ) {
      emm_sap_t emm_sap;
      emm_sap.primitive = EMMESM_ESTABLISH_CNF;
      emm_sap.u.emm_esm.u.establish.is_attached = TRUE;
      emm_sap.u.emm_esm.u.establish.is_emergency = TRUE;
508
      (void) emm_sap_send(user, &emm_sap);
gauthier's avatar
   
gauthier committed
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
    }

    LOG_FUNC_RETURN (ebi);
  }

  LOG_FUNC_RETURN (ESM_EBI_UNASSIGNED);
}

/****************************************************************************
 **                                                                        **
 ** Name:    esm_ebr_context_get_pid()                                 **
 **                                                                        **
 ** Description: Returns the identifier of the PDN connection entry the    **
 **      default EPS bearer context with the specified EPS bearer  **
 **      identity belongs to                                       **
 **                                                                        **
 ** Inputs:  ebi:       The EPS bearer identity of the default EPS **
 **             bearer context                             **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    The identifier of the PDN connection entry **
 **             associated to the specified default EPS    **
 **             bearer context if it exists; -1 otherwise. **
 **      Others:    None                                       **
 **                                                                        **
 ***************************************************************************/
535
int esm_ebr_context_get_pid(esm_data_t *esm_data, int ebi)
gauthier's avatar
   
gauthier committed
536
537
538
539
540
541
{
  LOG_FUNC_IN;

  int pid;

  for (pid = 0; pid < ESM_DATA_PDN_MAX; pid++) {
542
    if (esm_data->pdn[pid].data == NULL) {
gauthier's avatar
   
gauthier committed
543
544
545
      continue;
    }

546
    if (esm_data->pdn[pid].data->bearer[0] == NULL) {
gauthier's avatar
   
gauthier committed
547
548
549
      continue;
    }

550
    if (esm_data->pdn[pid].data->bearer[0]->ebi == ebi) {
gauthier's avatar
   
gauthier committed
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
      break;
    }
  }

  if (pid < ESM_DATA_PDN_MAX) {
    LOG_FUNC_RETURN (pid);
  }

  LOG_FUNC_RETURN (-1);
}

/****************************************************************************
 **                                                                        **
 ** Name:    esm_ebr_context_check_tft()                               **
 **                                                                        **
 ** Description: Checks syntactical errors in packet filters associated to **
 **      the EPS bearer context with the specified EPS bearer      **
 **      identity for the PDN connection entry with the given      **
 **      identifier                                                **
 **                                                                        **
 ** Inputs:  pid:       Identifier of the PDN connection entry the **
 **             EPS bearer context belongs to              **
 **      ebi:       The EPS bearer identity of the EPS bearer  **
 **             context with associated packet filter list **
 **      tft:       The traffic flow template (set of packet   **
 **             filters) to be checked                     **
 **      operation: Traffic flow template operation            **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
 **                                                                        **
 ***************************************************************************/
584
int esm_ebr_context_check_tft(esm_data_t *esm_data, int pid, int ebi,
gauthier's avatar
   
gauthier committed
585
586
587
588
589
590
591
592
593
                              const network_tft_t *tft,
                              esm_ebr_context_tft_t operation)
{
  LOG_FUNC_IN;

  int rc = RETURNerror;
  int i;

  if (pid < ESM_DATA_PDN_MAX) {
594
    if (pid != esm_data->pdn[pid].pid) {
gauthier's avatar
   
gauthier committed
595
596
      LOG_TRACE(ERROR, "ESM-PROC  - PDN connection identifier %d "
                "is not valid", pid);
597
    } else if (esm_data->pdn[pid].data == NULL) {
gauthier's avatar
   
gauthier committed
598
599
600
      LOG_TRACE(ERROR, "ESM-PROC  - PDN connection %d has not been "
                "allocated", pid);
    } else if (operation == ESM_EBR_CONTEXT_TFT_CREATE) {
601
      esm_pdn_t *pdn = esm_data->pdn[pid].data;
gauthier's avatar
   
gauthier committed
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721

      /* For each EPS bearer context associated to the PDN connection */
      for (i = 0; i < pdn->n_bearers; i++) {
        if (pdn->bearer[i]) {
          if (pdn->bearer[i]->ebi == ebi) {
            /* Check the packet filter identifiers */
            rc = _esm_ebr_context_check_identifiers(tft,
                                                    &pdn->bearer[i]->tft);

            if (rc != RETURNok) {
              break;
            }
          }

          /* Check the packet filter precedence values */
          rc = _esm_ebr_context_check_precedence(tft,
                                                 &pdn->bearer[i]->tft);

          if (rc != RETURNok) {
            break;
          }
        }
      }
    }
  }

  LOG_FUNC_RETURN (rc);
}

/****************************************************************************/
/*********************  L O C A L    F U N C T I O N S  *********************/
/****************************************************************************/

/****************************************************************************
 **                                                                        **
 ** Name:    _esm_ebr_context_check_identifiers()                      **
 **                                                                        **
 ** Description: Compares traffic flow templates to check whether two or   **
 **      more packet filters have identical packet filter identi-  **
 **      fiers                                                     **
 **                                                                        **
 ** Inputs:  tft1:      The first set of packet filters            **
 **      tft2:      The second set of packet filters           **
 **      Others:    None                                       **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    RETURNerror if at least one packet filter  **
 **             has same identifier in both traffic flow   **
 **             templates; RETURNok otherwise.             **
 **      Others:    None                                       **
 **                                                                        **
 ***************************************************************************/
static int _esm_ebr_context_check_identifiers(const network_tft_t *tft1,
    const network_tft_t *tft2)
{
  int i;
  int j;

  if ( (tft1 == NULL) || (tft2 == NULL) ) {
    return (RETURNok);
  }

  for (i = 0; i < tft1->n_pkfs; i++) {
    for (j = 0; j < tft2->n_pkfs; j++) {
      /* Packet filters should have been allocated */
      if (tft1->pkf[i]->id == tft2->pkf[i]->id) {
        /* 3GPP TS 24.301, section 6.4.2.5, abnormal cases d.1
         * Packet filters have same identifier */
        return (RETURNerror);
      }
    }
  }

  return (RETURNok);
}

/****************************************************************************
 **                                                                        **
 ** Name:    _esm_ebr_context_check_precedence()                       **
 **                                                                        **
 ** Description: Compares traffic flow templates to check whether two or   **
 **      more packet filters have identical precedence values      **
 **                                                                        **
 ** Inputs:  tft1:      The first set of packet filters            **
 **      tft2:      The second set of packet filters           **
 **      Others:    None                                       **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    RETURNerror if at least one packet filter  **
 **             has same precedence value in both traffic  **
 **             flow templates; RETURNerror otherwise.     **
 **      Others:    None                                       **
 **                                                                        **
 ***************************************************************************/
static int _esm_ebr_context_check_precedence(const network_tft_t *tft1,
    const network_tft_t *tft2)
{
  int i;
  int j;

  if ( (tft1 == NULL) || (tft2 == NULL) ) {
    return (RETURNok);
  }

  for (i = 0; i < tft1->n_pkfs; i++) {
    for (j = 0; j < tft2->n_pkfs; j++) {
      /* Packet filters should have been allocated */
      if (tft1->pkf[i]->precedence == tft2->pkf[i]->precedence) {
        /* 3GPP TS 24.301, section 6.4.2.5, abnormal cases d.2
         * Packet filters have same precedence value */
        /* TODO: Actually if the old packet filters do not belong
         * to the default EPS bearer context, the UE shall not
         * diagnose an error (see 6.4.2.5, abnormal cases d.2) */
        return (RETURNerror);
      }
    }
  }

  return (RETURNok);
}