/* packet-mac-nr.h
 *
 * Martin Mathieson
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

/* radioType */
#define FDD_RADIO 1
#define TDD_RADIO 2

/* Direction */
#define DIRECTION_UPLINK   0
#define DIRECTION_DOWNLINK 1

/* rntiType */
#define NO_RNTI     0
#define P_RNTI      1
#define RA_RNTI     2
#define C_RNTI      3
#define SI_RNTI     4
#define CS_RNTI     5
#define MSGB_RNTI   6

/* Context info attached to each NR MAC frame */
typedef struct mac_nr_info
{
    /* Needed for decode */
    uint8_t         radioType;
    uint8_t         direction;
    uint8_t         rntiType;

    /* Extra info to display */
    uint16_t        rnti;
    uint16_t        ueid;
    uint8_t         harqid;

    /* Will these be included in the ME PHR report? */
    uint8_t         phr_type2_othercell;

    /* Timing info */
    bool            sfnSlotInfoPresent;
    uint16_t        sysframeNumber;
    uint16_t        slotNumber;

    /* Length of DL PDU or UL grant size in bytes */
    uint16_t        length;

} mac_nr_info;


/* Functions to be called from outside this module (e.g. in a plugin, where mac_nr_info
   isn't available) to get/set per-packet data */
WS_DLL_PUBLIC
mac_nr_info *get_mac_nr_proto_data(packet_info *pinfo);
WS_DLL_PUBLIC
void set_mac_nr_proto_data(packet_info *pinfo, mac_nr_info *p_mac_nr_info);

/*****************************************************************/
/* UDP framing format                                            */
/* -----------------------                                       */
/* Several people have asked about dissecting MAC by framing     */
/* PDUs over IP.  A suggested format over UDP has been created   */
/* and implemented by this dissector, using the definitions      */
/* below.                                                        */
/*                                                               */
/* A heuristic dissector (enabled by a preference) will          */
/* recognise a signature at the beginning of these frames.       */
/*****************************************************************/


/* Signature.  Rather than try to define a port for this, or make the
   port number a preference, frames will start with this string (with no
   terminating NULL */
#define MAC_NR_START_STRING "mac-nr"

/* Fixed fields.  This is followed by the following 3 mandatory fields:
   - radioType (1 byte)
   - direction (1 byte)
   - rntiType (1 byte)
   (where the allowed values are defined above */

/* Optional fields. Attaching this info to frames will allow you
   to show you display/filter/plot/add-custom-columns on these fields, so should
   be added if available.
   The format is to have the tag, followed by the value (there is no length field,
   it's implicit from the tag) */

#define MAC_NR_RNTI_TAG                0x02
/* 2 bytes, network order */

#define MAC_NR_UEID_TAG                0x03
/* 2 bytes, network order */

#define MAC_NR_FRAME_SUBFRAME_TAG      0x04
/* 2 bytes, deprecated, do not use it */

#define MAC_NR_PHR_TYPE2_OTHERCELL_TAG 0x05
/* 1 byte, true/false */

#define MAC_NR_HARQID                  0x06
/* 1 byte */

#define MAC_NR_FRAME_SLOT_TAG          0x07
/* 4 bytes, network order, SFN is stored in the 2 first bytes and slot number in the 2 last bytes */

/* MAC PDU. Following this tag comes the actual MAC PDU (there is no length, the PDU
   continues until the end of the frame) */
#define MAC_NR_PAYLOAD_TAG             0x01


/* Type to store parameters for configuring LCID->RLC channel settings for DRB */
/* Some are optional, and may not be seen (e.g. on reestablishment) */
typedef struct nr_drb_mac_rlc_mapping_t
{
    bool       active;              /* Is set while inside RLC-BearerConfig or DRB-ToAddMod */
    uint16_t   ueid;                /* Mandatory */
    bool       is_drb;              /* Mandatory */
    uint8_t    rbid;                /* Mandatory */

    bool       lcid_present;
    uint8_t    lcid;                /* Part of LogicalChannelConfig - optional */
    bool       rlcMode_present;
    uint8_t    rlcMode;             /* Part of RLC config - optional */

    uint8_t    tempDirection;       /* So know direction of next SN length... */

    bool       rlcUlSnLength_present;
    uint8_t    rlcUlSnLength;        /* Part of RLC config - optional */
    bool       rlcDlSnLength_present;
    uint8_t    rlcDlSnLength;        /* Part of RLC config - optional */
} nr_drb_mac_rlc_mapping_t;


/* Set details of an LCID -> drb channel mapping.  To be called from
   configuration protocol (i.e. RRC) */
void set_mac_nr_bearer_mapping(nr_drb_mac_rlc_mapping_t *drb_mapping);

void set_mac_nr_srb3_in_use(uint16_t ueid);
void set_mac_nr_srb4_in_use(uint16_t ueid);


/* Function to attempt to populate p_mac_lte_info using framing definition above */
bool dissect_mac_nr_context_fields(struct mac_nr_info  *p_mac_nr_info, tvbuff_t *tvb,
                                       packet_info *pinfo, proto_tree *tree, int *p_offset);

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */