oap.h

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/*
 * (C) 2015-2016 by sysmocom s.f.m.c. GmbH
 * All Rights Reserved
 *
 * Author: Neels Hofmeyr
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#pragma once

#include <stdint.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>

enum osmo_oap_iei {
        OAP_CAUSE_IE                    = 0x02,
        OAP_RAND_IE                     = 0x20,
        OAP_AUTN_IE                     = 0x23,
        OAP_XRES_IE                     = 0x24,
        OAP_AUTS_IE                     = 0x25,
        OAP_CLIENT_ID_IE                = 0x30,
};

enum osmo_oap_message_type {
        OAP_MSGT_REGISTER_REQUEST       = 0b00000100,
        OAP_MSGT_REGISTER_ERROR         = 0b00000101,
        OAP_MSGT_REGISTER_RESULT        = 0b00000110,

        OAP_MSGT_CHALLENGE_REQUEST      = 0b00001000,
        OAP_MSGT_CHALLENGE_ERROR        = 0b00001001,
        OAP_MSGT_CHALLENGE_RESULT       = 0b00001010,

        OAP_MSGT_SYNC_REQUEST           = 0b00001100,
        OAP_MSGT_SYNC_ERROR             = 0b00001101,
        OAP_MSGT_SYNC_RESULT            = 0b00001110,
};

struct osmo_oap_message {
        enum osmo_oap_message_type message_type;
        enum gsm48_gmm_cause cause;
        uint16_t client_id;
        int rand_present;
        uint8_t rand[16];
        int autn_present;
        uint8_t autn[16];
        int xres_present;
        uint8_t xres[8];
        int auts_present;
        uint8_t auts[14];
};

int osmo_oap_decode(struct osmo_oap_message *oap_msg, const uint8_t *data,
                    size_t data_len);
void osmo_oap_encode(struct msgb *msg, const struct osmo_oap_message *oap_msg);