mirror of https://gerrit.osmocom.org/libosmocore
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
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/* (C) 2016 by Sysmocom s.f.m.c. GmbH
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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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#include <osmocom/core/utils.h>
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#include <osmocom/core/msgb.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.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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/* Encode AoIP transport address element */
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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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port = ntohs(sin->sin_port);
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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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port = ntohs(sin6->sin6_port);
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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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/* Decode AoIP transport address element */
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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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if (len <= 0)
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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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