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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);
}
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