sgsnemu failing to create PDP context with Cisco GGSN

BJovke . bjovan at gmail.com
Tue Sep 13 08:00:37 UTC 2016


Hello.

sgsnemu cannot establish PDP context with latest Cisco GGSN.
There is additional information element "Bearer control mode" sent by GGSN
in create PDP context response message (attachment).
This information element is not recognized by sgsnemu.

Here are the changes in libgtp to support this information element:

9  gtp/gtpie.c
 @@ -243,7 +243,8 @@ int gtpie_decaps(union gtpie_member *ie[], int
version, void *pack,
  case GTPIE_RP_SMS:
  case GTPIE_RP:
  case GTPIE_MS_NOT_REACH:
 - if (j < GTPIE_SIZE) {
 + case GTPIE_BCM:
 +      if (j < GTPIE_SIZE) {
  ie[j] = (union gtpie_member *)p;
  if (GTPIE_DEBUG)
  printf
 @@ -457,7 +458,8 @@ int gtpie_encaps(union gtpie_member *ie[], void *pack,
unsigned *len)
  case GTPIE_RP_SMS:
  case GTPIE_RP:
  case GTPIE_MS_NOT_REACH:
 - iesize = 2;
 + case GTPIE_BCM:
 +        iesize = 2;
  break;
  case GTPIE_FL_DI: /* TV GTPIE types with value length 2 */
  case GTPIE_FL_C:
 @@ -558,7 +560,8 @@ int gtpie_encaps2(union gtpie_member ie[], unsigned
int size,
  case GTPIE_RP_SMS:
  case GTPIE_RP:
  case GTPIE_MS_NOT_REACH:
 - iesize = 2;
 + case GTPIE_BCM:
 +          iesize = 2;
  break;
  case GTPIE_PFI: /* TV GTPIE types with value length 2 */
  case GTPIE_CHARGING_C:

1  gtp/gtpie.h
 @@ -106,6 +106,7 @@ static __inline uint64_t hton64(uint64_t q)
  #define GTPIE_USER_LOC      152 /* User Location Information  */
  #define GTPIE_MS_TZ         153 /* MS Time Zone */
  #define GTPIE_IMEI_SV       154 /* IMEI Software Version */
 +#define GTPIE_BCM           184 /* Bearer control mode */
  /* 239-250 Reserved for the GPRS charging protocol (see GTP' in GSM
12.15) */
  #define GTPIE_CHARGING_ADDR 251 /* Charging Gateway Address */
  /* 252-254 Reserved for the GPRS charging protocol (see GTP' in GSM
12.15) */



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