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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
* Copyright (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Copyright (C) 2023 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#if !defined(OGS_GTP_INSIDE) && !defined(OGS_GTP_COMPILATION)
#error "This header cannot be included directly."
#endif
#ifndef OGS_GTP_XACT_H
#define OGS_GTP_XACT_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* p225-226 Chapter 7.6 in TS 29.274 V15.9.0
*
* A Sequence Number used for a Command message shall have the most significant
* bit set to 1. A Sequence Number in a message, which was triggered by
* a Command message, as well as respective Triggered Reply message
* shall have the same Sequence Number as the Command message
* (i.e. shall also have the most significant bit set to 1).
*
* This setting of the most significant bit of the Sequence Number is done
* to avoid potential clashes between the Sequence Number selected for
* a Command message, and the Sequence Number selected by a GTPv2 peer
* for a Request message, which was not triggered by a Command message.
*
* A Sequence Number used for a Request message, which was not triggered
* by a Command message shall have the most significant bit set to 0.
*/
#define OGS_GTP_MIN_XACT_ID 1
#define OGS_GTP_CMD_XACT_ID 0x800000
#define OGS_GTP1_MIN_XACT_ID 0
#define OGS_GTP1_MAX_XACT_ID 65535
/**
* Transaction context
*/
typedef struct ogs_gtp_xact_s {
ogs_lnode_t node; /**< A node of list */
ogs_pool_id_t id;
/*
* Issues #3240
*
* SMF->SGW-C->MME: First Update Bearer Request
* MME->UE: First Modify EPS bearer context request
* SMF->SGW-C->MME: Second Update Bearer Request
* MME->UE: Second Modify EPS bearer context request
* UE->MME: First Modify EPS bearer context accept
* MME->SGW-C->SMF: First Update Bearer Response
* UE->MME: Second Modify EPS bearer context accept
* MME->SGW-C->SMF: Second Update Bearer Response
*
* In the above situation, while NAS-ESM messages are exchanged
* between the MME and UE, the bearer may have multiple transactions
* that need to be managed. to_update_node is used as a node
* in the Transaction List related to Update Bearer Request/Response.
*/
ogs_lnode_t to_update_node;
ogs_pool_id_t index;
uint8_t gtp_version; /**< 1 or 2 */
#define OGS_GTP_LOCAL_ORIGINATOR 0
#define OGS_GTP_REMOTE_ORIGINATOR 1
uint8_t org; /**< Transaction' originator.
local or remote */
uint32_t xid; /**< Transaction ID */
ogs_gtp_node_t *gnode; /**< Relevant GTP node context */
void (*cb)(ogs_gtp_xact_t *, void *); /**< Local timer expiration handler */
void *data; /**< Transaction Data */
int step; /**< Current step in the sequence.
1 : Initial
2 : Triggered
3 : Triggered-Reply */
struct {
uint8_t type; /**< Message type history */
ogs_pkbuf_t *pkbuf; /**< Packet history */
} seq[3]; /**< history for the each step */
ogs_timer_t *tm_response; /**< Timer waiting for next message */
uint8_t response_rcount;
ogs_timer_t *tm_holding; /**< Timer waiting for holding message */
uint8_t holding_rcount;
ogs_timer_t *tm_peer; /**< Timer waiting for peer message */
void (*peer_cb)(ogs_gtp_xact_t *, void *); /**< timer expiration handler */
void *peer_data; /**< Peer timeout data */
uint32_t local_teid; /**< Local TEID,
expected in reply from peer */
ogs_pool_id_t assoc_xact_id; /**< Associated GTP transaction ID */
void *pfcp_xact; /**< Associated PFCP transaction */
#define OGS_GTP_MODIFY_TFT_UPDATE ((uint64_t)1<<0)
#define OGS_GTP_MODIFY_QOS_UPDATE ((uint64_t)1<<1)
uint64_t update_flags;
#define OGS_GTP_DELETE_NO_ACTION 1
#define OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST 2
#define OGS_GTP_DELETE_SEND_DETACH_ACCEPT 3
#define OGS_GTP_DELETE_SEND_DEACTIVATE_BEARER_CONTEXT_REQUEST 4
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE 5
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_S1_REMOVE_AND_UNLINK 6
#define OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST 7
#define OGS_GTP_DELETE_IN_PATH_SWITCH_REQUEST 8
int delete_action;
#define OGS_GTP_RELEASE_SEND_UE_CONTEXT_RELEASE_COMMAND 1
#define OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_LO_CONNREFUSED 2
#define OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_RESET_ALL 3
#define OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_RESET_PARTIAL 4
int release_action;
#define OGS_GTP_DELETE_INDIRECT_HANDOVER_COMPLETE 1
#define OGS_GTP_DELETE_INDIRECT_HANDOVER_CANCEL 2
int delete_indirect_action;
#define OGS_GTP_CREATE_IN_ATTACH_REQUEST 1
#define OGS_GTP_CREATE_IN_UPLINK_NAS_TRANSPORT 2
#define OGS_GTP_CREATE_IN_PATH_SWITCH_REQUEST 3
#define OGS_GTP_CREATE_IN_TRACKING_AREA_UPDATE 4 /* 3GPP TS 33.401 9.1.2 */
int create_action;
#define OGS_GTP_MODIFY_IN_PATH_SWITCH_REQUEST 1
#define OGS_GTP_MODIFY_IN_E_RAB_MODIFICATION 2
int modify_action;
} ogs_gtp_xact_t;
int ogs_gtp_xact_init(void);
void ogs_gtp_xact_final(void);
ogs_gtp_xact_t *ogs_gtp1_xact_local_create(ogs_gtp_node_t *gnode,
ogs_gtp1_header_t *hdesc, ogs_pkbuf_t *pkbuf,
void (*cb)(ogs_gtp_xact_t *xact, void *data), void *data);
ogs_gtp_xact_t *ogs_gtp_xact_local_create(ogs_gtp_node_t *gnode,
ogs_gtp2_header_t *hdesc, ogs_pkbuf_t *pkbuf,
void (*cb)(ogs_gtp_xact_t *xact, void *data), void *data);
ogs_gtp_xact_t *ogs_gtp_xact_find_by_id(ogs_pool_id_t id);
void ogs_gtp_xact_delete_all(ogs_gtp_node_t *gnode);
int ogs_gtp1_xact_update_tx(ogs_gtp_xact_t *xact,
ogs_gtp1_header_t *hdesc, ogs_pkbuf_t *pkbuf);
int ogs_gtp_xact_update_tx(ogs_gtp_xact_t *xact,
ogs_gtp2_header_t *hdesc, ogs_pkbuf_t *pkbuf);
int ogs_gtp_xact_commit(ogs_gtp_xact_t *xact);
int ogs_gtp1_xact_receive(ogs_gtp_node_t *gnode,
ogs_gtp1_header_t *h, ogs_gtp_xact_t **xact);
int ogs_gtp_xact_receive(ogs_gtp_node_t *gnode,
ogs_gtp2_header_t *h, ogs_gtp_xact_t **xact);
void ogs_gtp_xact_associate(ogs_gtp_xact_t *xact1, ogs_gtp_xact_t *xact2);
void ogs_gtp_xact_deassociate(ogs_gtp_xact_t *xact1, ogs_gtp_xact_t *xact2);
#ifdef __cplusplus
}
#endif
#endif /* OGS_GTP_XACT_H */
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