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AMF sends in-valid GUTI in registration accept #645

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Merged
gab-arrobo merged 2 commits into from
Mar 31, 2026
+10 −4
Merged

AMF sends in-valid GUTI in registration accept #645

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fe36338
invalid guti fix
ashithacdac Mar 19, 2026
d6ed3b6
modified guami check
ashithacdac Mar 24, 2026
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14 changes: 10 additions & 4 deletions gmm/handler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -572,13 +572,19 @@ func HandleRegistrationRequest(ctx ctxt.Context, ue *context.AmfUe, anType model
case nasMessage.MobileIdentity5GSType5gGuti:
guamiFromUeGutiTmp, guti := nasConvert.GutiToString(mobileIdentity5GSContents)
guamiFromUeGuti = guamiFromUeGutiTmp
ue.Guti = guti
ue.GmmLog.Debugf("GUTI: %s", guti)

servedGuami := amfSelf.ServedGuamiList[0]
if reflect.DeepEqual(guamiFromUeGuti, servedGuami) {
guamiMatched := false
for _, servedGuami := range amfSelf.ServedGuamiList {
if reflect.DeepEqual(guamiFromUeGuti, servedGuami) {
guamiMatched = true
break
}
}
if guamiMatched {
ue.Guti = guti
ue.ServingAmfChanged = false
} else {
ue.GmmLog.Warnf("GUAMI mismatch/not-served GUAMI from UE")
ue.GmmLog.Debugf("Serving AMF has changed but 5G-Core is not supporting for now")
ue.ServingAmfChanged = false
}
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