2017-06-20 02:35:06 +00:00
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/*! \file gsm0808_utils.c */
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/*
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* (C) 2016 by Sysmocom s.f.m.c. GmbH
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2017-03-24 16:59:26 +00:00
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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2017-05-15 10:50:04 +00:00
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#include "config.h"
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2017-03-24 16:59:26 +00:00
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#include <osmocom/core/utils.h>
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#include <osmocom/core/msgb.h>
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2017-05-15 10:11:36 +00:00
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#include <osmocom/core/byteswap.h>
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2017-03-24 16:59:26 +00:00
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#include <string.h>
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#include <errno.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#define IP_V4_ADDR_LEN 4
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#define IP_V6_ADDR_LEN 16
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#define IP_PORT_LEN 2
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2017-03-28 15:05:40 +00:00
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#define CHANNEL_TYPE_ELEMENT_MAXLEN 11
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#define CHANNEL_TYPE_ELEMENT_MINLEN 3
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2017-03-28 16:36:52 +00:00
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#define ENCRYPT_INFO_ELEMENT_MINLEN 1
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2017-03-24 17:03:17 +00:00
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2017-05-15 10:50:04 +00:00
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#include <netinet/in.h>
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2017-06-12 19:44:18 +00:00
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/*! \addtogroup gsm0808
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* @{
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*/
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2017-06-19 22:17:59 +00:00
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/*! Encode TS 08.08 AoIP transport address IE
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2017-06-12 19:44:18 +00:00
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* \param[out] msg Message Buffer to which to append IE
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* \param[in] ss Socket Address to be used in IE
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* \returns number of bytes added to \a msg */
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2017-03-24 16:59:26 +00:00
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uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
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const struct sockaddr_storage *ss)
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{
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/* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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uint16_t port = 0;
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uint8_t *ptr;
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uint8_t *old_tail;
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uint8_t *tlv_len;
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OSMO_ASSERT(msg);
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OSMO_ASSERT(ss);
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OSMO_ASSERT(ss->ss_family == AF_INET || ss->ss_family == AF_INET6);
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msgb_put_u8(msg, GSM0808_IE_AOIP_TRASP_ADDR);
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tlv_len = msgb_put(msg,1);
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old_tail = msg->tail;
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switch (ss->ss_family) {
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case AF_INET:
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sin = (struct sockaddr_in *)ss;
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2017-05-15 10:11:36 +00:00
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port = osmo_ntohs(sin->sin_port);
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2017-03-24 16:59:26 +00:00
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ptr = msgb_put(msg, IP_V4_ADDR_LEN);
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memcpy(ptr, &sin->sin_addr.s_addr, IP_V4_ADDR_LEN);
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break;
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)ss;
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2017-05-15 10:11:36 +00:00
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port = osmo_ntohs(sin6->sin6_port);
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2017-03-24 16:59:26 +00:00
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ptr = msgb_put(msg, IP_V6_ADDR_LEN);
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memcpy(ptr, sin6->sin6_addr.s6_addr, IP_V6_ADDR_LEN);
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break;
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}
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msgb_put_u16(msg, port);
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*tlv_len = (uint8_t) (msg->tail - old_tail);
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return *tlv_len + 2;
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}
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2017-06-19 22:17:59 +00:00
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/*! Decode TS 08.08 AoIP transport address IE
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2017-06-12 19:44:18 +00:00
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* \param[out] ss Caller-provided memory where decoded socket addr is stored
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* \param[in] elem pointer to IE value
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* \param[in] len length of \a elem in bytes
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* \returns number of bytes parsed */
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2017-03-24 16:59:26 +00:00
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int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
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const uint8_t *elem, uint8_t len)
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{
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/* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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const uint8_t *old_elem = elem;
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OSMO_ASSERT(ss);
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if (!elem)
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return -EINVAL;
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2017-04-28 09:05:44 +00:00
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if (len == 0)
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2017-03-24 16:59:26 +00:00
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return -EINVAL;
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memset(ss, 0, sizeof(*ss));
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switch (len) {
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case IP_V4_ADDR_LEN + IP_PORT_LEN:
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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memcpy(&sin.sin_addr.s_addr, elem, IP_V4_ADDR_LEN);
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elem += IP_V4_ADDR_LEN;
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sin.sin_port = osmo_load16le(elem);
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elem += IP_PORT_LEN;
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memcpy(ss, &sin, sizeof(sin));
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break;
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case IP_V6_ADDR_LEN + IP_PORT_LEN:
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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memcpy(sin6.sin6_addr.s6_addr, elem, IP_V6_ADDR_LEN);
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elem += IP_V6_ADDR_LEN;
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sin6.sin6_port = osmo_load16le(elem);
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elem += IP_PORT_LEN;
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memcpy(ss, &sin6, sizeof(sin6));
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break;
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default:
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/* Malformed element! */
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return -EINVAL;
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break;
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}
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return (int)(elem - old_elem);
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}
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2017-03-24 17:03:17 +00:00
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2017-05-15 10:50:04 +00:00
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#endif /* HAVE_SYS_SOCKET_H */
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2017-03-24 17:03:17 +00:00
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/* Helper function for gsm0808_enc_speech_codec()
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* and gsm0808_enc_speech_codec_list() */
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static uint8_t enc_speech_codec(struct msgb *msg,
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const struct gsm0808_speech_codec *sc)
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{
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/* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
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uint8_t header = 0;
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uint8_t *old_tail;
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2017-06-01 15:11:19 +00:00
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bool type_extended;
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/* Note: Extended codec types are codec types that require 8 instead
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* of 4 bit to fully specify the selected codec. In the following,
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* we check if we work with an extended type or not. We also check
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* if the codec type is valid at all. */
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switch(sc->type) {
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case GSM0808_SCT_FR1:
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case GSM0808_SCT_FR2:
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case GSM0808_SCT_FR3:
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case GSM0808_SCT_FR4:
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case GSM0808_SCT_FR5:
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case GSM0808_SCT_HR1:
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case GSM0808_SCT_HR3:
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case GSM0808_SCT_HR4:
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case GSM0808_SCT_HR6:
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type_extended = false;
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break;
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case GSM0808_SCT_CSD:
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type_extended = true;
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break;
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default:
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/* Invalid codec type specified */
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OSMO_ASSERT(false);
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break;
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}
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2017-03-24 17:03:17 +00:00
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old_tail = msg->tail;
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if (sc->fi)
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header |= (1 << 7);
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if (sc->pi)
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header |= (1 << 6);
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if (sc->pt)
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header |= (1 << 5);
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if (sc->tf)
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header |= (1 << 4);
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2017-06-01 15:11:19 +00:00
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if (type_extended) {
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2017-03-24 17:03:17 +00:00
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header |= 0x0f;
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msgb_put_u8(msg, header);
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2017-06-01 15:11:19 +00:00
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msgb_put_u8(msg, sc->type);
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2017-03-24 17:03:17 +00:00
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} else {
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OSMO_ASSERT(sc->type < 0x0f);
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header |= sc->type;
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msgb_put_u8(msg, header);
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}
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2017-06-01 15:11:19 +00:00
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/* Note: Whether a configuration is present or not depends on the
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* selected codec type. If present, it can either consist of one
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* or two octets, depending on the codec type */
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switch (sc->type) {
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case GSM0808_SCT_FR3:
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case GSM0808_SCT_HR3:
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case GSM0808_SCT_HR6:
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2017-03-24 17:03:17 +00:00
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msgb_put_u16(msg, sc->cfg);
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2017-06-01 15:11:19 +00:00
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break;
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case GSM0808_SCT_FR4:
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case GSM0808_SCT_FR5:
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case GSM0808_SCT_HR4:
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case GSM0808_SCT_CSD:
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OSMO_ASSERT((sc->cfg & 0xff00) == 0)
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msgb_put_u8(msg, (uint8_t) sc->cfg & 0xff);
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break;
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default:
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OSMO_ASSERT(sc->cfg == 0);
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break;
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}
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2017-03-24 17:03:17 +00:00
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return (uint8_t) (msg->tail - old_tail);
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}
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2017-06-19 22:17:59 +00:00
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/*! Encode TS 08.08 Speech Codec IE
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2017-06-12 19:44:18 +00:00
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* \param[out] msg Message Buffer to which IE will be appended
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* \param[in] sc Speech Codec to be encoded into IE
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* \returns number of bytes appended to \a msg */
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2017-03-24 17:03:17 +00:00
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uint8_t gsm0808_enc_speech_codec(struct msgb *msg,
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const struct gsm0808_speech_codec *sc)
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{
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2017-06-22 22:29:34 +00:00
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/*! See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
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2017-03-24 17:03:17 +00:00
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uint8_t *old_tail;
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uint8_t *tlv_len;
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OSMO_ASSERT(msg);
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OSMO_ASSERT(sc);
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msgb_put_u8(msg, GSM0808_IE_SPEECH_CODEC);
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tlv_len = msgb_put(msg, 1);
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old_tail = msg->tail;
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enc_speech_codec(msg, sc);
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*tlv_len = (uint8_t) (msg->tail - old_tail);
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return *tlv_len + 2;
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}
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2017-06-19 22:17:59 +00:00
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/*! Decode TS 08.08 Speech Codec IE
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2017-06-12 19:44:18 +00:00
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* \param[out] sc Caller-allocated memory for Speech Codec
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* \param[in] elem IE value to be decoded
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* \param[in] len Length of \a elem in bytes
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* \returns number of bytes parsed; negative on error */
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2017-03-24 17:03:17 +00:00
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int gsm0808_dec_speech_codec(struct gsm0808_speech_codec *sc,
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const uint8_t *elem, uint8_t len)
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{
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/* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
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uint8_t header;
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const uint8_t *old_elem = elem;
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OSMO_ASSERT(sc);
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if (!elem)
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return -EINVAL;
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2017-04-28 09:05:44 +00:00
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if (len == 0)
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2017-03-24 17:03:17 +00:00
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return -EINVAL;
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memset(sc, 0, sizeof(*sc));
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header = *elem;
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2017-04-28 08:55:05 +00:00
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/* An extended codec type needs at least two fields,
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* bail if the input data length is not sufficient. */
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2017-03-24 17:03:17 +00:00
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if ((header & 0x0F) == 0x0F && len < 2)
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return -EINVAL;
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elem++;
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len--;
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if (header & (1 << 7))
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sc->fi = true;
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if (header & (1 << 6))
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sc->pi = true;
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if (header & (1 << 5))
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sc->pt = true;
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if (header & (1 << 4))
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sc->tf = true;
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if ((header & 0x0F) != 0x0F) {
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sc->type = (header & 0x0F);
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2017-06-01 15:11:19 +00:00
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} else {
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sc->type = *elem;
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elem++;
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len--;
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2017-03-24 17:03:17 +00:00
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}
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2017-06-01 15:11:19 +00:00
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/* Note: Whether a configuration is present or not depends on the
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* selected codec type. If present, it can either consist of one or
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* two octets depending on the codec type */
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switch (sc->type) {
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case GSM0808_SCT_FR1:
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case GSM0808_SCT_FR2:
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case GSM0808_SCT_HR1:
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break;
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case GSM0808_SCT_HR4:
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case GSM0808_SCT_CSD:
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case GSM0808_SCT_FR4:
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case GSM0808_SCT_FR5:
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if (len < 1)
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return -EINVAL;
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sc->cfg = *elem;
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elem++;
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break;
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case GSM0808_SCT_FR3:
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case GSM0808_SCT_HR3:
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case GSM0808_SCT_HR6:
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if (len < 2)
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return -EINVAL;
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sc->cfg = osmo_load16be(elem);
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elem += 2;
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break;
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default:
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/* Invalid codec type => malformed speech codec element! */
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return -EINVAL;
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break;
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}
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2017-03-24 17:03:17 +00:00
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return (int)(elem - old_elem);
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}
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|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Encode TS 08.08 Speech Codec list
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] msg Message Buffer to which IE is to be appended
|
|
|
|
* \param[in] scl Speech Codec List to be encoded into IE
|
|
|
|
* \returns number of bytes added to \a msg */
|
2017-03-24 17:03:17 +00:00
|
|
|
uint8_t gsm0808_enc_speech_codec_list(struct msgb *msg,
|
|
|
|
const struct gsm0808_speech_codec_list *scl)
|
|
|
|
{
|
2017-06-22 22:29:34 +00:00
|
|
|
/*! See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
|
2017-03-24 17:03:17 +00:00
|
|
|
uint8_t *old_tail;
|
|
|
|
uint8_t *tlv_len;
|
|
|
|
unsigned int i;
|
|
|
|
uint8_t rc;
|
|
|
|
unsigned int bytes_used = 0;
|
|
|
|
|
|
|
|
OSMO_ASSERT(msg);
|
|
|
|
OSMO_ASSERT(scl);
|
|
|
|
|
|
|
|
/* Empty list */
|
|
|
|
OSMO_ASSERT(scl->len >= 1);
|
|
|
|
|
|
|
|
msgb_put_u8(msg, GSM0808_IE_SPEECH_CODEC_LIST);
|
|
|
|
tlv_len = msgb_put(msg, 1);
|
|
|
|
old_tail = msg->tail;
|
|
|
|
|
|
|
|
for (i = 0; i < scl->len; i++) {
|
|
|
|
rc = enc_speech_codec(msg, &scl->codec[i]);
|
|
|
|
OSMO_ASSERT(rc >= 1);
|
|
|
|
bytes_used += rc;
|
|
|
|
OSMO_ASSERT(bytes_used <= 255);
|
|
|
|
}
|
|
|
|
|
|
|
|
*tlv_len = (uint8_t) (msg->tail - old_tail);
|
|
|
|
return *tlv_len + 2;
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Decode TS 08.08 Speech Codec list IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] scl Caller-provided memory to store codec list
|
|
|
|
* \param[in] elem IE value to be decoded
|
|
|
|
* \param[in] len Length of \a elem in bytes
|
|
|
|
* \returns number of bytes parsed; negative on error */
|
2017-03-24 17:03:17 +00:00
|
|
|
int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl,
|
|
|
|
const uint8_t *elem, uint8_t len)
|
|
|
|
{
|
2017-06-22 22:29:34 +00:00
|
|
|
/*! See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
|
2017-03-24 17:03:17 +00:00
|
|
|
const uint8_t *old_elem = elem;
|
|
|
|
unsigned int i;
|
|
|
|
int rc;
|
|
|
|
uint8_t decoded = 0;
|
|
|
|
|
|
|
|
OSMO_ASSERT(scl);
|
|
|
|
if (!elem)
|
|
|
|
return -EINVAL;
|
2017-04-28 09:05:44 +00:00
|
|
|
if (len == 0)
|
2017-03-24 17:03:17 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(scl, 0, sizeof(*scl));
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(scl->codec); i++) {
|
|
|
|
if (len <= 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
rc = gsm0808_dec_speech_codec(&scl->codec[i], elem, len);
|
|
|
|
if (rc < 1)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
elem+=rc;
|
|
|
|
len -= rc;
|
|
|
|
decoded++;
|
|
|
|
}
|
|
|
|
|
|
|
|
scl->len = decoded;
|
|
|
|
|
|
|
|
/* Empty list */
|
|
|
|
if (decoded < 1) {
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (int)(elem - old_elem);
|
|
|
|
}
|
2017-03-28 15:05:40 +00:00
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Encode TS 08.08 Channel Type IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] msg Message Buffer to which IE is to be appended
|
|
|
|
* \param[in] ct Channel Type to be encoded
|
|
|
|
* \returns number of bytes added to \a msg */
|
2017-03-28 15:05:40 +00:00
|
|
|
uint8_t gsm0808_enc_channel_type(struct msgb *msg,
|
|
|
|
const struct gsm0808_channel_type *ct)
|
|
|
|
{
|
2017-06-22 22:29:34 +00:00
|
|
|
/*! See also 3GPP TS 48.008 3.2.2.11 Channel Type */
|
2017-03-28 15:05:40 +00:00
|
|
|
unsigned int i;
|
|
|
|
uint8_t byte;
|
|
|
|
uint8_t *old_tail;
|
|
|
|
uint8_t *tlv_len;
|
|
|
|
|
|
|
|
OSMO_ASSERT(msg);
|
|
|
|
OSMO_ASSERT(ct);
|
|
|
|
OSMO_ASSERT(ct->perm_spch_len <= CHANNEL_TYPE_ELEMENT_MAXLEN - 2);
|
|
|
|
|
|
|
|
/* FIXME: Implement encoding support for Data
|
|
|
|
* and Speech + CTM Text Telephony */
|
|
|
|
if ((ct->ch_indctr & 0x0f) != GSM0808_CHAN_SPEECH
|
|
|
|
&& (ct->ch_indctr & 0x0f) != GSM0808_CHAN_SIGN)
|
|
|
|
OSMO_ASSERT(false);
|
|
|
|
|
|
|
|
msgb_put_u8(msg, GSM0808_IE_CHANNEL_TYPE);
|
|
|
|
tlv_len = msgb_put(msg, 1);
|
|
|
|
old_tail = msg->tail;
|
|
|
|
|
|
|
|
msgb_put_u8(msg, ct->ch_indctr & 0x0f);
|
|
|
|
msgb_put_u8(msg, ct->ch_rate_type);
|
|
|
|
|
|
|
|
for (i = 0; i < ct->perm_spch_len; i++) {
|
|
|
|
byte = ct->perm_spch[i];
|
|
|
|
|
|
|
|
if (i < ct->perm_spch_len - 1)
|
|
|
|
byte |= 0x80;
|
|
|
|
msgb_put_u8(msg, byte);
|
|
|
|
}
|
|
|
|
|
|
|
|
*tlv_len = (uint8_t) (msg->tail - old_tail);
|
|
|
|
return *tlv_len + 2;
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Decode TS 08.08 Channel Type IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] ct Caller-provided memory to store channel type
|
|
|
|
* \param[in] elem IE Value to be decoded
|
|
|
|
* \param[in] len Length of \a elem in bytes
|
|
|
|
* \returns number of bytes parsed; negative on error */
|
2017-03-28 15:05:40 +00:00
|
|
|
int gsm0808_dec_channel_type(struct gsm0808_channel_type *ct,
|
|
|
|
const uint8_t *elem, uint8_t len)
|
|
|
|
{
|
2017-06-22 22:29:34 +00:00
|
|
|
/*! See also 3GPP TS 48.008 3.2.2.11 Channel Type */
|
2017-03-28 15:05:40 +00:00
|
|
|
unsigned int i;
|
|
|
|
uint8_t byte;
|
|
|
|
const uint8_t *old_elem = elem;
|
|
|
|
|
|
|
|
OSMO_ASSERT(ct);
|
|
|
|
if (!elem)
|
|
|
|
return -EINVAL;
|
2017-04-28 09:05:44 +00:00
|
|
|
if (len < 3 || len > 11)
|
2017-03-28 15:05:40 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(ct, 0, sizeof(*ct));
|
|
|
|
|
|
|
|
ct->ch_indctr = (*elem) & 0x0f;
|
|
|
|
elem++;
|
|
|
|
ct->ch_rate_type = (*elem) & 0x0f;
|
|
|
|
elem++;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ct->perm_spch); i++) {
|
|
|
|
byte = *elem;
|
|
|
|
elem++;
|
|
|
|
ct->perm_spch[i] = byte & 0x7f;
|
|
|
|
if ((byte & 0x80) == 0x00)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
ct->perm_spch_len = i + 1;
|
|
|
|
|
|
|
|
return (int)(elem - old_elem);
|
|
|
|
}
|
2017-03-28 16:36:52 +00:00
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Encode TS 08.08 Encryption Information IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] msg Message Buffer to which IE is to be appended
|
|
|
|
* \param[in] ei Encryption Information to be encoded
|
|
|
|
* \returns number of bytes appended to \a msg */
|
2017-03-28 16:36:52 +00:00
|
|
|
uint8_t gsm0808_enc_encrypt_info(struct msgb *msg,
|
|
|
|
const struct gsm0808_encrypt_info *ei)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
uint8_t perm_algo = 0;
|
|
|
|
uint8_t *ptr;
|
|
|
|
uint8_t *old_tail;
|
|
|
|
uint8_t *tlv_len;
|
|
|
|
|
|
|
|
OSMO_ASSERT(msg);
|
|
|
|
OSMO_ASSERT(ei);
|
|
|
|
OSMO_ASSERT(ei->key_len <= ARRAY_SIZE(ei->key));
|
|
|
|
OSMO_ASSERT(ei->perm_algo_len <= ENCRY_INFO_PERM_ALGO_MAXLEN);
|
|
|
|
|
|
|
|
msgb_put_u8(msg, GSM0808_IE_ENCRYPTION_INFORMATION);
|
|
|
|
tlv_len = msgb_put(msg, 1);
|
|
|
|
old_tail = msg->tail;
|
|
|
|
|
|
|
|
for (i = 0; i < ei->perm_algo_len; i++) {
|
|
|
|
/* Note: gsm_08_08.h defines the permitted algorithms
|
|
|
|
* as an enum which ranges from 0x01 to 0x08 */
|
|
|
|
OSMO_ASSERT(ei->perm_algo[i] != 0);
|
|
|
|
OSMO_ASSERT(ei->perm_algo[i] <= ENCRY_INFO_PERM_ALGO_MAXLEN);
|
|
|
|
perm_algo |= (1 << (ei->perm_algo[i] - 1));
|
|
|
|
}
|
|
|
|
|
|
|
|
msgb_put_u8(msg, perm_algo);
|
|
|
|
ptr = msgb_put(msg, ei->key_len);
|
|
|
|
memcpy(ptr, ei->key, ei->key_len);
|
|
|
|
|
|
|
|
*tlv_len = (uint8_t) (msg->tail - old_tail);
|
|
|
|
return *tlv_len + 2;
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Decode TS 08.08 Encryption Information IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] ei Caller-provided memory to store encryption information
|
|
|
|
* \param[in] elem IE value to be decoded
|
|
|
|
* \param[in] len Length of \a elem in bytes
|
|
|
|
* \returns number of bytes parsed; negative on error */
|
2017-03-28 16:36:52 +00:00
|
|
|
int gsm0808_dec_encrypt_info(struct gsm0808_encrypt_info *ei,
|
|
|
|
const uint8_t *elem, uint8_t len)
|
|
|
|
{
|
|
|
|
uint8_t perm_algo;
|
|
|
|
unsigned int i;
|
|
|
|
unsigned int perm_algo_len = 0;
|
|
|
|
const uint8_t *old_elem = elem;
|
|
|
|
|
|
|
|
OSMO_ASSERT(ei);
|
|
|
|
if (!elem)
|
|
|
|
return -EINVAL;
|
2017-04-28 09:05:44 +00:00
|
|
|
if (len == 0)
|
2017-03-28 16:36:52 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(ei, 0, sizeof(*ei));
|
|
|
|
|
|
|
|
perm_algo = *elem;
|
|
|
|
elem++;
|
|
|
|
|
|
|
|
for (i = 0; i < ENCRY_INFO_PERM_ALGO_MAXLEN; i++) {
|
|
|
|
if (perm_algo & (1 << i)) {
|
|
|
|
ei->perm_algo[perm_algo_len] = i + 1;
|
|
|
|
perm_algo_len++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
ei->perm_algo_len = perm_algo_len;
|
|
|
|
|
|
|
|
ei->key_len = len - 1;
|
|
|
|
memcpy(ei->key, elem, ei->key_len);
|
|
|
|
elem+=ei->key_len;
|
|
|
|
|
|
|
|
return (int)(elem - old_elem);
|
|
|
|
}
|
2017-03-29 09:35:50 +00:00
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Encode TS 08.08 Cell Identifier List IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] msg Message Buffer to which IE is to be appended
|
|
|
|
* \param[in] cil Cell ID List to be encoded
|
|
|
|
* \returns number of bytes appended to \a msg */
|
2017-03-29 09:35:50 +00:00
|
|
|
uint8_t gsm0808_enc_cell_id_list(struct msgb *msg,
|
|
|
|
const struct gsm0808_cell_id_list *cil)
|
|
|
|
{
|
|
|
|
uint8_t *old_tail;
|
|
|
|
uint8_t *tlv_len;
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
OSMO_ASSERT(msg);
|
|
|
|
OSMO_ASSERT(cil);
|
|
|
|
|
|
|
|
msgb_put_u8(msg, GSM0808_IE_CELL_IDENTIFIER_LIST);
|
|
|
|
tlv_len = msgb_put(msg, 1);
|
|
|
|
old_tail = msg->tail;
|
|
|
|
|
|
|
|
msgb_put_u8(msg, cil->id_discr & 0x0f);
|
|
|
|
|
|
|
|
switch (cil->id_discr) {
|
|
|
|
case CELL_IDENT_LAC:
|
|
|
|
OSMO_ASSERT(cil->id_list_len <= CELL_ID_LIST_LAC_MAXLEN)
|
|
|
|
for (i=0;i<cil->id_list_len;i++) {
|
|
|
|
msgb_put_u16(msg, cil->id_list_lac[i]);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case CELL_IDENT_BSS:
|
|
|
|
/* Does not have any list items */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* FIXME: Implement support for all identifier list elements */
|
|
|
|
OSMO_ASSERT(false);
|
|
|
|
}
|
|
|
|
|
|
|
|
*tlv_len = (uint8_t) (msg->tail - old_tail);
|
|
|
|
return *tlv_len + 2;
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Decode Cell Identifier List IE
|
2017-06-12 19:44:18 +00:00
|
|
|
* \param[out] cil Caller-provided memory to store Cell ID list
|
|
|
|
* \param[in] elem IE value to be decoded
|
|
|
|
* \param[in] len Length of \a elem in bytes
|
|
|
|
* \returns number of bytes parsed; negative on error */
|
2017-03-29 09:35:50 +00:00
|
|
|
int gsm0808_dec_cell_id_list(struct gsm0808_cell_id_list *cil,
|
|
|
|
const uint8_t *elem, uint8_t len)
|
|
|
|
{
|
|
|
|
uint8_t id_discr;
|
|
|
|
const uint8_t *old_elem = elem;
|
|
|
|
unsigned int item_count = 0;
|
|
|
|
|
|
|
|
OSMO_ASSERT(cil);
|
|
|
|
if (!elem)
|
|
|
|
return -EINVAL;
|
2017-04-28 09:05:44 +00:00
|
|
|
if (len == 0)
|
2017-03-29 09:35:50 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(cil, 0, sizeof(*cil));
|
|
|
|
|
|
|
|
id_discr = *elem & 0x0f;
|
|
|
|
elem++;
|
|
|
|
len--;
|
|
|
|
|
|
|
|
cil->id_discr = id_discr;
|
|
|
|
|
|
|
|
switch (id_discr) {
|
|
|
|
case CELL_IDENT_LAC:
|
|
|
|
while (len >= 2) {
|
|
|
|
cil->id_list_lac[item_count] = osmo_load16be(elem);
|
|
|
|
elem += 2;
|
|
|
|
item_count++;
|
|
|
|
len -= 2;
|
|
|
|
}
|
|
|
|
case CELL_IDENT_BSS:
|
|
|
|
/* Does not have any list items */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* FIXME: Implement support for all identifier list elements */
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
cil->id_list_len = item_count;
|
|
|
|
return (int)(elem - old_elem);
|
|
|
|
}
|
2017-06-12 19:44:18 +00:00
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Convert the representation of the permitted speech codec identifier
|
2017-06-02 11:22:34 +00:00
|
|
|
* that is used in struct gsm0808_channel_type to the speech codec
|
|
|
|
* representation we use in struct gsm0808_speech_codec.
|
|
|
|
* \param[in] perm_spch to be converted (see also gsm0808_permitted_speech)
|
|
|
|
* \returns GSM speech codec type; negative on error */
|
|
|
|
int gsm0808_chan_type_to_speech_codec(uint8_t perm_spch)
|
|
|
|
{
|
|
|
|
/*! The speech codec type, which is used in the channel type field to
|
|
|
|
* signal the permitted speech versions (codecs) has a different
|
|
|
|
* encoding than the type field in the speech codec type element
|
|
|
|
* (See also 3GPP TS 48.008, 3.2.2.11 and 3.2.2.103) */
|
|
|
|
|
|
|
|
switch (perm_spch) {
|
|
|
|
case GSM0808_PERM_FR1:
|
|
|
|
return GSM0808_SCT_FR1;
|
|
|
|
case GSM0808_PERM_FR2:
|
|
|
|
return GSM0808_SCT_FR2;
|
|
|
|
case GSM0808_PERM_FR3:
|
|
|
|
return GSM0808_SCT_FR3;
|
|
|
|
case GSM0808_PERM_FR4:
|
|
|
|
return GSM0808_SCT_FR4;
|
|
|
|
case GSM0808_PERM_FR5:
|
|
|
|
return GSM0808_SCT_FR5;
|
|
|
|
case GSM0808_PERM_HR1:
|
|
|
|
return GSM0808_SCT_HR1;
|
|
|
|
case GSM0808_PERM_HR3:
|
|
|
|
return GSM0808_SCT_HR3;
|
|
|
|
case GSM0808_PERM_HR4:
|
|
|
|
return GSM0808_SCT_HR4;
|
|
|
|
case GSM0808_PERM_HR6:
|
|
|
|
return GSM0808_SCT_HR6;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Invalid input */
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! Extrapolate a speech codec field from a given permitted speech
|
2017-06-02 11:49:16 +00:00
|
|
|
* parameter (channel type).
|
|
|
|
* \param[out] sc Caller provided memory to store the resulting speech codec
|
|
|
|
* \param[in] perm_spch value that is used to derive the speech codec info
|
|
|
|
* (see also: enum gsm0808_speech_codec_type in gsm0808_utils.h)
|
|
|
|
* \returns zero when successful; negative on error */
|
|
|
|
int gsm0808_speech_codec_from_chan_type(struct gsm0808_speech_codec *sc,
|
|
|
|
uint8_t perm_spch)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
memset(sc, 0, sizeof(*sc));
|
|
|
|
|
|
|
|
/* Determine codec type */
|
|
|
|
rc = gsm0808_chan_type_to_speech_codec(perm_spch);
|
|
|
|
if (rc < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
sc->type = (uint8_t) rc;
|
|
|
|
|
|
|
|
/* Depending on the speech codec type, pick a default codec
|
|
|
|
* configuration that exactly matches the configuration on the
|
|
|
|
* air interface. */
|
|
|
|
switch (sc->type) {
|
|
|
|
case GSM0808_SCT_FR3:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_FR_AMR;
|
|
|
|
break;
|
|
|
|
case GSM0808_SCT_FR4:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_OFR_AMR_WB;
|
|
|
|
break;
|
|
|
|
case GSM0808_SCT_FR5:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_FR_AMR_WB;
|
|
|
|
break;
|
|
|
|
case GSM0808_SCT_HR3:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_HR_AMR;
|
|
|
|
break;
|
|
|
|
case GSM0808_SCT_HR4:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_OHR_AMR_WB;
|
|
|
|
break;
|
|
|
|
case GSM0808_SCT_HR6:
|
|
|
|
sc->cfg = GSM0808_SC_CFG_DEFAULT_OHR_AMR;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Note: Not all codec types specify a default setting,
|
|
|
|
* in this case, we just set the field to zero. */
|
|
|
|
sc->cfg = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Tag all codecs as "Full IP"
|
|
|
|
* (see als 3GPP TS 48.008 3.2.2.103) */
|
|
|
|
sc->fi = true;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-06-12 19:44:18 +00:00
|
|
|
/*! @} */
|