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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| // Copyright 2024 Louis Royer and the NextMN contributors. All rights reserved. | ||
| // Use of this source code is governed by a MIT-style license that can be | ||
| // found in the LICENSE file. | ||
| // SPDX-License-Identifier: MIT | ||
|
|
||
| package amf | ||
|
|
||
| import ( | ||
| "net/http" | ||
|
|
||
| "github.com/nextmn/json-api/jsonapi" | ||
| "github.com/nextmn/json-api/jsonapi/n1n2" | ||
|
|
||
| "github.com/gin-gonic/gin" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| func (amf *Amf) HandoverNotify(c *gin.Context) { | ||
| var m n1n2.HandoverNotify | ||
| if err := c.BindJSON(&m); err != nil { | ||
| logrus.WithError(err).Error("could not deserialize") | ||
| c.JSON(http.StatusBadRequest, jsonapi.MessageWithError{Message: "could not deserialize", Error: err}) | ||
| return | ||
| } | ||
| logrus.WithFields(logrus.Fields{ | ||
| "ue": m.UeCtrl.String(), | ||
| "gnb-target": m.TargetGnb.String(), | ||
| }).Info("New Handover Confirm") | ||
| go amf.HandleHandoverNotify(m) | ||
| c.JSON(http.StatusAccepted, jsonapi.Message{Message: "please refer to logs for more information"}) | ||
| } | ||
|
|
||
| func (amf *Amf) HandleHandoverNotify(m n1n2.HandoverNotify) { | ||
| // TODO: | ||
| // 1. update upf-i with pdu-session-n3.NextDownlinkFteid | ||
| // 2. update pdu-session-n3 with Downlink NextDownlinkFteid, and remove the NextDownlinkFteid field | ||
|
|
||
| logrus.Error("Handover Notify: Not implemented") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // Copyright 2024 Louis Royer and the NextMN contributors. All rights reserved. | ||
| // Use of this source code is governed by a MIT-style license that can be | ||
| // found in the LICENSE file. | ||
| // SPDX-License-Identifier: MIT | ||
|
|
||
| package amf | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "net/http" | ||
|
|
||
| "github.com/nextmn/json-api/jsonapi" | ||
| "github.com/nextmn/json-api/jsonapi/n1n2" | ||
|
|
||
| "github.com/gin-gonic/gin" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| func (amf *Amf) HandoverRequestAck(c *gin.Context) { | ||
| var m n1n2.HandoverRequestAck | ||
| if err := c.BindJSON(&m); err != nil { | ||
| logrus.WithError(err).Error("could not deserialize") | ||
| c.JSON(http.StatusBadRequest, jsonapi.MessageWithError{Message: "could not deserialize", Error: err}) | ||
| return | ||
| } | ||
| logrus.WithFields(logrus.Fields{ | ||
| "ue": m.UeCtrl.String(), | ||
| "gnb-source": m.SourcegNB.String(), | ||
| "gnb-target": m.TargetgNB.String(), | ||
| }).Info("New Handover Request Ack") | ||
| go amf.HandleHandoverRequestAck(m) | ||
| c.JSON(http.StatusAccepted, jsonapi.Message{Message: "please refer to logs for more information"}) | ||
| } | ||
|
|
||
| func (amf *Amf) HandleHandoverRequestAck(m n1n2.HandoverRequestAck) { | ||
| // TODO: if UPF-i change, push new DL rules | ||
|
|
||
| // send handover command to source with forwarding rule to targetGNB | ||
| sessions := make([]n1n2.Session, len(m.Sessions)) | ||
| for i, s := range m.Sessions { | ||
| dl, err := amf.smf.GetSessionDownlinkFteid(m.UeCtrl, s.Addr, s.Dnn) | ||
| if err != nil { | ||
| // TODO: notify of failure | ||
| continue | ||
| } | ||
| sessions[i] = n1n2.Session{ | ||
| Addr: s.Addr, | ||
| Dnn: s.Dnn, | ||
| UplinkFteid: s.UplinkFteid, | ||
| DownlinkFteid: dl, | ||
| ForwardDownlinkFteid: s.DownlinkFteid, | ||
| } | ||
| if err := amf.smf.StoreNextDownlinkFteid(m.UeCtrl, s.Addr, s.Dnn, s.DownlinkFteid); err != nil { | ||
| // TODO: notify of failure | ||
| continue | ||
| } | ||
| } | ||
|
|
||
| resp := n1n2.HandoverCommand{ | ||
| Cp: m.Cp, | ||
| TargetGnb: m.TargetgNB, | ||
| SourceGnb: m.SourcegNB, | ||
| UeCtrl: m.UeCtrl, | ||
| Sessions: sessions, | ||
| } | ||
| ctx := amf.Context() | ||
| reqBody, err := json.Marshal(resp) | ||
| if err != nil { | ||
| logrus.WithError(err).Error("Could not marshal n1n2.HandoverRequest") | ||
| return | ||
| } | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodPost, m.SourcegNB.JoinPath("ps/handover-command").String(), bytes.NewBuffer(reqBody)) | ||
| if err != nil { | ||
| logrus.WithError(err).Error("Could not create request for ps/handover-command") | ||
| return | ||
| } | ||
| req.Header.Set("User-Agent", amf.userAgent) | ||
| req.Header.Set("Content-Type", "application/json; charset=UTF-8") | ||
| if _, err := amf.client.Do(req); err != nil { | ||
| logrus.WithError(err).Error("Could not send ps/handover-command") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // Copyright 2024 Louis Royer and the NextMN contributors. All rights reserved. | ||
| // Use of this source code is governed by a MIT-style license that can be | ||
| // found in the LICENSE file. | ||
| // SPDX-License-Identifier: MIT | ||
|
|
||
| package amf | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "net/http" | ||
|
|
||
| "github.com/nextmn/json-api/jsonapi" | ||
| "github.com/nextmn/json-api/jsonapi/n1n2" | ||
|
|
||
| "github.com/gin-gonic/gin" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| func (amf *Amf) HandoverRequired(c *gin.Context) { | ||
| var m n1n2.HandoverRequired | ||
| if err := c.BindJSON(&m); err != nil { | ||
| logrus.WithError(err).Error("could not deserialize") | ||
| c.JSON(http.StatusBadRequest, jsonapi.MessageWithError{Message: "could not deserialize", Error: err}) | ||
| return | ||
| } | ||
| logrus.WithFields(logrus.Fields{ | ||
| "ue": m.Ue.String(), | ||
| "gnb-source": m.SourcegNB.String(), | ||
| "gnb-target": m.TargetgNB.String(), | ||
| }).Info("New Handover Required") | ||
| go amf.HandleHandoverRequired(m) | ||
| c.JSON(http.StatusAccepted, jsonapi.Message{Message: "please refer to logs for more information"}) | ||
| } | ||
|
|
||
| func (amf *Amf) HandleHandoverRequired(m n1n2.HandoverRequired) { | ||
| // TODO: if UPF-i change, push new UL rules | ||
|
|
||
| // send handover-request to target with UPF-i FTEID | ||
| ctx := amf.Context() | ||
|
|
||
| sessions := make([]n1n2.Session, len(m.Sessions)) | ||
| for i, s := range m.Sessions { | ||
| uplinkfteid, err := amf.smf.GetSessionUplinkFteid(m.Ue, s.Addr, s.Dnn) | ||
| if err != nil { | ||
| // TODO: notify gnb of failure | ||
| logrus.WithError(err).WithFields(logrus.Fields{ | ||
| "ue": s.Addr, | ||
| "dnn": s.Dnn, | ||
| }).Error("Could not find Uplink FTEID for handover") | ||
| continue | ||
| } | ||
| sessions[i] = n1n2.Session{ | ||
| Addr: s.Addr, | ||
| Dnn: s.Dnn, | ||
| UplinkFteid: uplinkfteid, | ||
| } | ||
|
|
||
| } | ||
| // send PseAccept to UE | ||
| resp := n1n2.HandoverRequest{ | ||
| // Header | ||
| UeCtrl: m.Ue, | ||
| Cp: m.Cp, | ||
| TargetgNB: m.TargetgNB, | ||
|
|
||
| // Handover Request | ||
| Sessions: sessions, | ||
| } | ||
| reqBody, err := json.Marshal(resp) | ||
| if err != nil { | ||
| logrus.WithError(err).Error("Could not marshal n1n2.HandoverRequest") | ||
| return | ||
| } | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodPost, m.TargetgNB.JoinPath("ps/handover-request").String(), bytes.NewBuffer(reqBody)) | ||
| if err != nil { | ||
| logrus.WithError(err).Error("Could not create request for ps/handover-request") | ||
| return | ||
| } | ||
| req.Header.Set("User-Agent", amf.userAgent) | ||
| req.Header.Set("Content-Type", "application/json; charset=UTF-8") | ||
| if _, err := amf.client.Do(req); err != nil { | ||
| logrus.WithError(err).Error("Could not send ps/handover-request") | ||
| } | ||
| } |
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