| /* |
| * GSM RLP (Radio Link Protocol) as used in CSD (3GPP TS 44.022) |
| * |
| * Copyright (C) 2022-2023 Harald Welte <laforge@osmocom.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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. |
| */ |
| |
| |
| |
| #pragma once |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include <osmocom/core/utils.h> |
| |
| /*! \defgroup rlp GSM RLP (Radio Link Protocol) as used in CSD (3GPP TS 24.022) |
| * @{ |
| * \file rlp.h */ |
| |
| /*! RLP frame type as per 3GPP TS 24.022 Section 5.2.1 */ |
| enum osmo_rlp_ftype { |
| OSMO_RLP_FT_U, |
| OSMO_RLP_FT_S, |
| OSMO_RLP_FT_IS, |
| }; |
| extern const struct value_string osmo_rlp_ftype_vals[]; |
| |
| /*! RLP U-Frame Type as per 3GPP TS 24.022 Section 5.2.1 */ |
| enum osmo_rlp_u_ftype { |
| OSMO_RLP_U_FT_SABM = 0x07, |
| OSMO_RLP_U_FT_UA = 0x0c, |
| OSMO_RLP_U_FT_DISC = 0x08, |
| OSMO_RLP_U_FT_DM = 0x03, |
| OSMO_RLP_U_FT_NULL = 0x0f, |
| OSMO_RLP_U_FT_UI = 0x00, |
| OSMO_RLP_U_FT_XID = 0x17, |
| OSMO_RLP_U_FT_TEST = 0x1c, |
| OSMO_RLP_U_FT_REMAP = 0x11, |
| }; |
| extern const struct value_string osmo_rlp_ftype_u_vals[]; |
| |
| /*! RLP S-Frame type as per 3GPP TS 24.022 Section 5.2.1 */ |
| enum osmo_rlp_s_ftype { |
| OSMO_RLP_S_FT_RR = 0, |
| OSMO_RLP_S_FT_REJ = 2, |
| OSMO_RLP_S_FT_RNR = 1, |
| OSMO_RLP_S_FT_SREJ = 3, |
| }; |
| extern const struct value_string osmo_rlp_ftype_s_vals[]; |
| |
| /*! Data structure representing one decoded RLP frame */ |
| struct osmo_rlp_frame_decoded { |
| uint8_t version; |
| enum osmo_rlp_ftype ftype; |
| enum osmo_rlp_u_ftype u_ftype; |
| enum osmo_rlp_s_ftype s_ftype; |
| bool c_r; |
| bool p_f; |
| uint8_t s_bits; |
| uint16_t n_s; |
| uint16_t n_r; |
| uint32_t fcs; |
| uint8_t info[536/8]; |
| uint16_t info_len; |
| }; |
| |
| int osmo_rlp_decode(struct osmo_rlp_frame_decoded *out, uint8_t version, const uint8_t *data, size_t data_len); |
| int osmo_rlp_encode(uint8_t *out, size_t out_size, const struct osmo_rlp_frame_decoded *in); |
| uint32_t osmo_rlp_fcs_compute(const uint8_t *in, size_t in_len); |
| |
| /*! @} */ |