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[MME] emm-handler: Interpret unused Attach Type as EPS Attach

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3GPP TS 24.301:
"All other values are unused and shall be interpreted as "EPS attach", if received by the
network".
This commit is contained in:
Pau Espin Pedrol
2025-09-08 12:25:47 +02:00
committed by Sukchan Lee
parent 5d7d3e755f
commit 62f961bfbf
2 changed files with 13 additions and 2 deletions
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1
lib/nas/eps/types.h
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@@ -294,6 +294,7 @@ ED2(uint8_t spare:5;,
* M V 1/2 */
#define OGS_NAS_ATTACH_TYPE_EPS_ATTACH 1
#define OGS_NAS_ATTACH_TYPE_COMBINED_EPS_IMSI_ATTACH 2
#define OGS_NAS_ATTACH_TYPE_EPS_RLOS_ATTACH 3
#define OGS_NAS_ATTACH_TYPE_EPS_EMERGENCY_ATTACH 6
#define OGS_NAS_ATTACH_TYPE_RESERVED 7

12
src/mme/emm-handler.c
View File

@@ -108,9 +108,19 @@ int emm_handle_attach_request(enb_ue_t *enb_ue, mme_ue_t *mme_ue,
case OGS_NAS_ATTACH_TYPE_EPS_EMERGENCY_ATTACH:
ogs_debug(" Requested EPS_ATTACH_TYPE[3, EPS_EMERGENCY_ATTACH]");
break;
default:
case OGS_NAS_ATTACH_TYPE_RESERVED:
ogs_error(" Invalid Requested EPS_ATTACH_TYPE[%d]",
mme_ue->nas_eps.attach.value);
break;
case OGS_NAS_ATTACH_TYPE_EPS_RLOS_ATTACH:
/* fall-through: '"EPS RLOS attach" shall be interpreted as "EPS attach"
* by a network not supporting attach for access to RLOS."'*/
default:
/* 'All other values are unused and shall be interpreted as "EPS attach",
* if received by the network' */
ogs_warn(" Requested EPS_ATTACH_TYPE[%d], assuming EPS_ATTACH",
mme_ue->nas_eps.attach.value);
mme_ue->nas_eps.attach.value = OGS_NAS_ATTACH_TYPE_EPS_ATTACH;
}
/*