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/* (C) 2016 by Sysmocom s.f.m.c. GmbH
* All Rights Reserved
*
* Author: Philipp Maier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/core/utils.h>
#include <osmocom/core/msgb.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <osmocom/gsm/protocol/gsm_08_08.h>
#define IP_V4_ADDR_LEN 4
#define IP_V6_ADDR_LEN 16
#define IP_PORT_LEN 2
/* Encode AoIP transport address element */
uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
const struct sockaddr_storage *ss)
{
/* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
uint16_t port = 0;
uint8_t *ptr;
uint8_t *old_tail;
uint8_t *tlv_len;
OSMO_ASSERT(msg);
OSMO_ASSERT(ss);
OSMO_ASSERT(ss->ss_family == AF_INET || ss->ss_family == AF_INET6);
msgb_put_u8(msg, GSM0808_IE_AOIP_TRASP_ADDR);
tlv_len = msgb_put(msg,1);
old_tail = msg->tail;
switch (ss->ss_family) {
case AF_INET:
sin = (struct sockaddr_in *)ss;
port = ntohs(sin->sin_port);
ptr = msgb_put(msg, IP_V4_ADDR_LEN);
memcpy(ptr, &sin->sin_addr.s_addr, IP_V4_ADDR_LEN);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)ss;
port = ntohs(sin6->sin6_port);
ptr = msgb_put(msg, IP_V6_ADDR_LEN);
memcpy(ptr, sin6->sin6_addr.s6_addr, IP_V6_ADDR_LEN);
break;
}
msgb_put_u16(msg, port);
*tlv_len = (uint8_t) (msg->tail - old_tail);
return *tlv_len + 2;
}
/* Decode AoIP transport address element */
int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
const uint8_t *elem, uint8_t len)
{
/* See also 3GPP TS 48.008 3.2.2.102 AoIP Transport Layer Address */
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
const uint8_t *old_elem = elem;
OSMO_ASSERT(ss);
if (!elem)
return -EINVAL;
if (len <= 0)
return -EINVAL;
memset(ss, 0, sizeof(*ss));
switch (len) {
case IP_V4_ADDR_LEN + IP_PORT_LEN:
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr.s_addr, elem, IP_V4_ADDR_LEN);
elem += IP_V4_ADDR_LEN;
sin.sin_port = osmo_load16le(elem);
elem += IP_PORT_LEN;
memcpy(ss, &sin, sizeof(sin));
break;
case IP_V6_ADDR_LEN + IP_PORT_LEN:
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
memcpy(sin6.sin6_addr.s6_addr, elem, IP_V6_ADDR_LEN);
elem += IP_V6_ADDR_LEN;
sin6.sin6_port = osmo_load16le(elem);
elem += IP_PORT_LEN;
memcpy(ss, &sin6, sizeof(sin6));
break;
default:
/* Malformed element! */
return -EINVAL;
break;
}
return (int)(elem - old_elem);
}
/* Helper function for gsm0808_enc_speech_codec()
* and gsm0808_enc_speech_codec_list() */
static uint8_t enc_speech_codec(struct msgb *msg,
const struct gsm0808_speech_codec *sc)
{
/* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
uint8_t header = 0;
uint8_t *old_tail;
old_tail = msg->tail;
if (sc->fi)
header |= (1 << 7);
if (sc->pi)
header |= (1 << 6);
if (sc->pt)
header |= (1 << 5);
if (sc->tf)
header |= (1 << 4);
if (sc->type_extended) {
header |= 0x0f;
msgb_put_u8(msg, header);
} else {
OSMO_ASSERT(sc->type < 0x0f);
header |= sc->type;
msgb_put_u8(msg, header);
return (uint8_t) (msg->tail - old_tail);
}
msgb_put_u8(msg, sc->type);
if (sc->cfg_present)
msgb_put_u16(msg, sc->cfg);
return (uint8_t) (msg->tail - old_tail);
}
/* Encode Speech Codec element */
uint8_t gsm0808_enc_speech_codec(struct msgb *msg,
const struct gsm0808_speech_codec *sc)
{
uint8_t *old_tail;
uint8_t *tlv_len;
OSMO_ASSERT(msg);
OSMO_ASSERT(sc);
msgb_put_u8(msg, GSM0808_IE_SPEECH_CODEC);
tlv_len = msgb_put(msg, 1);
old_tail = msg->tail;
enc_speech_codec(msg, sc);
*tlv_len = (uint8_t) (msg->tail - old_tail);
return *tlv_len + 2;
}
/* Decode Speech Codec element */
int gsm0808_dec_speech_codec(struct gsm0808_speech_codec *sc,
const uint8_t *elem, uint8_t len)
{
/* See also 3GPP TS 48.008 3.2.2.103 Speech Codec List */
uint8_t header;
const uint8_t *old_elem = elem;
OSMO_ASSERT(sc);
if (!elem)
return -EINVAL;
if (len <= 0)
return -EINVAL;
memset(sc, 0, sizeof(*sc));
header = *elem;
/* Malformed elements */
if ((header & 0x0F) == 0x0F && len < 2)
return -EINVAL;
else if ((header & 0x0F) != 0x0F && len < 1)
return -EINVAL;
elem++;
len--;
if (header & (1 << 7))
sc->fi = true;
if (header & (1 << 6))
sc->pi = true;
if (header & (1 << 5))
sc->pt = true;
if (header & (1 << 4))
sc->tf = true;
if ((header & 0x0F) != 0x0F) {
sc->type = (header & 0x0F);
return (int)(elem - old_elem);
}
sc->type = *elem;
elem++;
len--;
sc->type_extended = true;
if (len < 2)
return (int)(elem - old_elem);
sc->cfg = osmo_load16be(elem);
elem += 2;
sc->cfg_present = true;
return (int)(elem - old_elem);
}
/* Encode Speech Codec list */
uint8_t gsm0808_enc_speech_codec_list(struct msgb *msg,
const struct gsm0808_speech_codec_list *scl)
{
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;
}
/* Decode Speech Codec list */
int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl,
const uint8_t *elem, uint8_t len)
{
const uint8_t *old_elem = elem;
unsigned int i;
int rc;
uint8_t decoded = 0;
OSMO_ASSERT(scl);
if (!elem)
return -EINVAL;
if (len <= 0)
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);
}
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