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UE paging can recreate the AS-side SDAP entity while NAS still keeps the PDU session established. Per TS 38.304 clause 7.1 and TS 24.501 clauses 5.6.2.2.1,5.6.1.2 paging/service request restores user-plane resources for an established PDU session, it does not imply deleting the UE IP/TUN interface. Deleting the UE TUN with SDAP entity teardown breaks user-plane continuity after re-attach. We need SDAP entity lifetime and UE TUN lifetime to be decoupled. This commit keeps a UE/PDU-session TUN registry outside the SDAP entity lifetime. When a UE SDAP entity is recreated, reattach it to the preserved TUN socket and restart the reader thread. On first PDU session setup, NAS registers the TUN before attaching the reader. The sequence is the following: (1) NAS register the iface (2) sdap entity attaches to the iface (3) UE goes IDLE, SDAP entity is destroyed, iface is deatched and brought down (4) UE Service Request, SDAP entity is created (5) iface reattaches to the SDAP entity and is brought up UE reattach assumes the PDU session TUN interface was registered before the SDAP entity is recreated. DL/UL data is intentionally dropped when SDAP is not yet attached or QFI is unavailable, rather than queued in this layer. Changes: - `nr_sdap.c`: keep a UE/PDU-session TUN registry, duplicate the stored socket into each SDAP entity, and add attach/detach/destroy helpers. - `nr_sdap_entity.c`: detach SDAP entities from their TUN reader on deletion, preserve UE TUN interfaces across idle cleanup, and destroy gNB TUN interfaces when the gNB entity is removed. Drop downlink SDUs if the UE SDAP entity is not attached to a TUN socket yet. - `openair3/NAS/NR_UE/nr_nas_msg.c`: set QFI before UE TUN creation so first attach can pick up cached QFI. - `common/utils/tuntap_if.c`: add `tuntap_set_up`/`tuntap_set_down` helpers for UE interface state reflection and initialize `flags` in `tuntap_destroy` to avoid maybe-uninitialized build failures. Signed-off-by: Guido Casati <guido.casati@openairinterface.org>
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: LicenseRef-CSSL-1.0
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*/
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#ifndef TUN_IF_H_
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#define TUN_IF_H_
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#include <stdbool.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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/*!
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* \brief This function generates the name of the interface based on the prefix and
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* the instance id.
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*
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* \param[in,out] ifname name of the interface
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* \param[in] ifprefix prefix of the interface
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* \param[in] instance_id unique instance number
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*/
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int tun_generate_ifname(char *ifname, const char *ifprefix, int instance_id);
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/*!
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* \brief This function generates the name of the interface based on the prefix and
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* the instance id for a UE.
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*
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* \param[in,out] ifname name of the interface
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* \param[in] flag IFF_TUN (for TUN device) or IFF_TAP (for TAP device)
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* \param[in] ifprefix prefix of the interface
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* \param[in] instance_id unique instance number
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*/
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int tuntap_generate_ue_ifname(char *ifname, int flag, int instance_id, int pdu_session_id);
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/*!
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* \brief This function initializes the TUN interface
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* \param[in] ifname name of the interface
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* \param[in] instance_id unique instance number, used to save socket file descriptor
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*/
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int tun_init(const char *ifname, int instance_id);
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/*!
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* \brief This function initializes the TUN interface for MBMS
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* \param[in] ifname name of the interface
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*/
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int tun_init_mbms(char *ifname);
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/*!
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* \brief Initializes the TUN interface with an IPv4 or IPv6 address and
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* activates the interface.
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* \param[in] ifname name of the interface
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* \param[in] ipv4 IPv4 address of this interface as a string
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* \param[in] ipv6 IPv6 address of this interface as a string
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* \return true on success, otherwise false
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* \note
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* @ingroup _nas
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*/
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bool tun_config(const char* ifname, const char *ipv4, const char *ipv6);
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/*!
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* \brief Initializes and activates the TAP interface.
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* \param[in] ifname name of the interface
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* \return true on success, otherwise false
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* \note
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* @ingroup _nas
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*/
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bool tap_config(const char* ifname);
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/*!
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* \brief Setup a IPv4 rule in table (interface_id - 1 + 10000) and route to
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* force packets coming into interface back through it, and workaround
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* net.ipv4.conf.all.rp_filter=2 (strict source filtering would filter out
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* responses of packets going out through interface to another IP address not
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* in same subnet).
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* \param[in] ifname name of the interface
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* \param[in] instance_id unique instance number, used to create the table
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* \param[in] ipv4 IPv4 address of the UE
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*/
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void setup_ue_ipv4_route(const char* ifname, int instance_id, const char *ipv4);
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/*!
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* \brief This function allocates a TUN or TAP interface
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* \param[in] flag IFF_TUN (for TUN device) or IFF_TAP (for TAP device)
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* \param[in] dev name of the interface
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* \return file descriptor of the allocated interface
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*/
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int tuntap_alloc(int flag, const char *dev);
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/*!
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* \brief This function destroys the TUN or TAP interface
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* \param[in] dev name of the interface
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*/
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void tuntap_destroy(const char *dev);
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/*!
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* \brief Bring a TUN/TAP interface administratively up (IOCTL SIOCSIFFLAGS, set IFF_UP).
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* \param[in] ifname name of the interface
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* \param[in] sock_fd IPv4 SOCK_DGRAM fd for ioctl (opened by the caller)
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* \return interface flags with IFF_UP set, or -1 on failure
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*/
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short tuntap_set_up(const char *ifname, int sock_fd);
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#endif /*TUN_IF_H_*/
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