mirror of
https://github.com/open5gs/open5gs.git
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3d693da73e
In an Inter-RAT setup a UE could perform a RAU coming from a 4G network. In that case the UE/MS is unknown to the SGSN and it should request the SGSN context (MM, PDP) from the MME. This is done through the following GTPv1C message exchange on the Gn interface of SGSN and MME: SGSN -> MME: SGSN Context Request SGSN <- MME: SGSN Context Response SGSN -> MME: SGSN Context Acknowledge This commit doesn't aim to be a complete implementation of the mentioned procedure, since it's quite a complex one, with lots of fields and logic required. This so far only implements in general the minimally successful case by filling as much as possible the required set of fields. This will allow for a base onto which do incremental improvements and fixes while testing against UEs and SGSNs (such as osmo-sgsn, which doesn't yet support this procedure but will potentially earn it soon). This commit doesn't implement the reverse direction, aka UE issuing cell reselection 2G->4G. Initial support for this scenario will hopefully be added soon as a follow-up patch, similar to this one. Related: https://osmocom.org/issues/6294
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
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* Copyright (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#if !defined(OGS_GTP_INSIDE) && !defined(OGS_GTP_COMPILATION)
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#error "This header cannot be included directly."
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#endif
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#ifndef OGS_GTP1_CONV_H
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#define OGS_GTP1_CONV_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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int ogs_gtp1_gsn_addr_to_sockaddr(const ogs_gtp1_gsn_addr_t *gsnaddr,
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uint16_t gsnaddr_len, uint16_t port, ogs_sockaddr_t **list);
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int ogs_gtp1_sockaddr_to_gsn_addr(const ogs_sockaddr_t *addr,
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const ogs_sockaddr_t *addr6, ogs_gtp1_gsn_addr_t *gsnaddr, int *len);
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int ogs_gtp1_gsn_addr_to_ip(const ogs_gtp1_gsn_addr_t *gsnaddr, uint16_t gsnaddr_len,
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ogs_ip_t *ip);
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int ogs_gtp1_pdu_session_type_to_eua_ietf_type(uint8_t session_type);
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int ogs_gtp1_eua_ietf_type_to_pdu_session_type(uint8_t eua_ietf_type);
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int ogs_gtp1_eua_to_ip(const ogs_eua_t *eua, uint16_t eua_len, ogs_ip_t *ip,
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uint8_t *pdu_session_type);
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int ogs_gtp1_ip_to_eua(uint8_t pdu_session_type, const ogs_ip_t *ip,
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ogs_eua_t *eua, uint8_t *eua_len);
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int ogs_gtp1_qos_profile_to_qci(const ogs_gtp1_qos_profile_decoded_t *decoded,
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uint8_t *qci);
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#ifdef __cplusplus
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}
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#endif
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#endif
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