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UE Register with TMSI: reply with a Register Reject 

When receiving a UE Register Request with TMSI and no IMSI, compose a
Register Reject with the same UE Identity and send.

The accepting function expects a ue_context argument and composes the
message from the IMSI found there. This new rejection message cannot rely
on a ue_context struct and hence uses the asn1 uE_Identity directly.

Change-Id: Ia47e398e50e316842cd260dc0d9a4e2d8a1c627c
This commit is contained in:
Neels Hofmeyr 2016-04-25 14:55:35 +02:00 committed by Harald Welte
parent f6673b7257
commit 1a0bb5108c
1 changed files with 65 additions and 1 deletions
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66
src/hnbgw_hnbap.c
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@ -114,6 +114,69 @@ static int hnbgw_tx_ue_register_acc(struct ue_context *ue)
return hnbgw_hnbap_tx(ue->hnb, msg);
}
static int hnbgw_tx_ue_register_rej_tmsi(struct hnb_context *hnb, UE_Identity_t *ue_id)
{
UERegisterReject_t reject_out;
UERegisterRejectIEs_t reject;
struct msgb *msg;
int rc;
memset(&reject, 0, sizeof(reject));
reject.uE_Identity.present = ue_id->present;
if (ue_id->present != UE_Identity_PR_tMSILAI) {
LOGP(DHNBAP, LOGL_ERROR, "Trying to reject UE Register without IMSI: only rejects of UE_Identity_PR_tMSILAI supported so far.\n");
return -1;
}
LOGP(DHNBAP, LOGL_DEBUG, "REJ UE_Id tMSI %d %s\n",
ue_id->choice.tMSILAI.tMSI.size,
osmo_hexdump(ue_id->choice.tMSILAI.tMSI.buf,
ue_id->choice.tMSILAI.tMSI.size));
LOGP(DHNBAP, LOGL_DEBUG, "REJ UE_Id pLMNID %d %s\n",
ue_id->choice.tMSILAI.lAI.pLMNID.size,
osmo_hexdump(ue_id->choice.tMSILAI.lAI.pLMNID.buf,
ue_id->choice.tMSILAI.lAI.pLMNID.size));
LOGP(DHNBAP, LOGL_DEBUG, "REJ UE_Id lAC %d %s\n",
ue_id->choice.tMSILAI.lAI.lAC.size,
osmo_hexdump(ue_id->choice.tMSILAI.lAI.lAC.buf,
ue_id->choice.tMSILAI.lAI.lAC.size));
BIT_STRING_fromBuf(&reject.uE_Identity.choice.tMSILAI.tMSI,
ue_id->choice.tMSILAI.tMSI.buf,
ue_id->choice.tMSILAI.tMSI.size * 8
- ue_id->choice.tMSILAI.tMSI.bits_unused);
OCTET_STRING_fromBuf(&reject.uE_Identity.choice.tMSILAI.lAI.pLMNID,
ue_id->choice.tMSILAI.lAI.pLMNID.buf,
ue_id->choice.tMSILAI.lAI.pLMNID.size);
OCTET_STRING_fromBuf(&reject.uE_Identity.choice.tMSILAI.lAI.lAC,
ue_id->choice.tMSILAI.lAI.lAC.buf,
ue_id->choice.tMSILAI.lAI.lAC.size);
reject.cause.present = Cause_PR_radioNetwork;
reject.cause.choice.radioNetwork = CauseRadioNetwork_invalid_UE_identity;
memset(&reject_out, 0, sizeof(reject_out));
rc = hnbap_encode_ueregisterrejecties(&reject_out, &reject);
if (rc < 0) {
return rc;
}
msg = hnbap_generate_unsuccessful_outcome(ProcedureCode_id_UERegister,
Criticality_reject,
&asn_DEF_UERegisterReject,
&reject_out);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_BIT_STRING, &reject.uE_Identity.choice.tMSILAI.tMSI);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_OCTET_STRING, &reject.uE_Identity.choice.tMSILAI.lAI.pLMNID);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_OCTET_STRING, &reject.uE_Identity.choice.tMSILAI.lAI.lAC);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_UERegisterReject, &reject_out);
return hnbgw_hnbap_tx(hnb, msg);
}
static int hnbgw_rx_hnb_deregister(struct hnb_context *ctx, ANY_t *in)
{
HNBDe_RegisterIEs_t ies;
@ -187,8 +250,9 @@ static int hnbgw_rx_ue_register_req(struct hnb_context *ctx, ANY_t *in)
LOGP(DHNBAP, LOGL_NOTICE, "UE-REGISTER-REQ without IMSI\n");
/* TODO: this is probably a TMSI registration. Store TMSIs
* and look them up to accept UE Registration. */
rc = hnbgw_tx_ue_register_rej_tmsi(ctx, &ies.uE_Identity);
hnbap_free_ueregisterrequesties(&ies);
return -1;
return rc;
}
DEBUGP(DHNBAP, "UE-REGISTER-REQ ID_type=%d imsi=%s cause=%ld\n",