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gsm0808: Add utils for AoIP Transport Layer Address 

The planned support for true A over IP requires the encoding and
decoding of a so called "AoIP Transport Layer Address" element.

This commt adds parsing functionality and tests for the element
mentioned above, however, it is not yet actively used.

Change-Id: I57933b0a06a3f54ec2a41e6ecb6ced9fbbc89332
This commit is contained in:
Philipp Maier 2017-03-24 17:59:26 +01:00 committed by Harald Welte
parent f7add0889c
commit 22401433aa
6 changed files with 220 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/Makefile.am
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@ -77,6 +77,7 @@ nobase_include_HEADERS = \
osmocom/coding/gsm0503_interleaving.h \
osmocom/coding/gsm0503_coding.h \
osmocom/gsm/gsm0808.h \
osmocom/gsm/gsm0808_utils.h \
osmocom/gsm/gsm23003.h \
osmocom/gsm/gsm48.h \
osmocom/gsm/gsm48_ie.h \

30
include/osmocom/gsm/gsm0808_utils.h Normal file
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@ -0,0 +1,30 @@
/* (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/>.
*
*/
#pragma once
#include <sys/socket.h>
/* Encode AoIP transport address element */
uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
const struct sockaddr_storage *ss);
/* Decode AoIP transport address element */
int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
const uint8_t *elem, uint8_t len);

2
src/gsm/Makefile.am
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@ -25,7 +25,7 @@ libgsmint_la_SOURCES = a5.c rxlev_stat.c tlv_parser.c comp128.c comp128v23.c \
auth_milenage.c milenage/aes-encblock.c gea.c \
milenage/aes-internal.c milenage/aes-internal-enc.c \
milenage/milenage.c gan.c ipa.c gsm0341.c apn.c \
gsup.c gprs_gea.c gsm0503_conv.c oap.c
gsup.c gprs_gea.c gsm0503_conv.c oap.c gsm0808_utils.c
libgsmint_la_LDFLAGS = -no-undefined
libgsmint_la_LIBADD = $(top_builddir)/src/libosmocore.la

122
src/gsm/gsm0808_utils.c Normal file
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@ -0,0 +1,122 @@
/* (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);
}

2
src/gsm/libosmogsm.map
View File

@ -137,6 +137,8 @@ gsm0808_create_layer3;
gsm0808_create_reset;
gsm0808_create_sapi_reject;
gsm0808_prepend_dtap_header;
gsm0808_enc_aoip_trasp_addr;
gsm0808_dec_aoip_trasp_addr;
gsm0858_rsl_ul_meas_enc;

64
tests/gsm0808/gsm0808_test.c
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@ -19,9 +19,14 @@
*/
#include <osmocom/gsm/gsm0808.h>
#include <osmocom/gsm/gsm0808_utils.h>
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define VERIFY(msg, data, len) \
if (msgb_l3len(msg) != len) { \
@ -247,6 +252,63 @@ static void test_prepend_dtap()
msgb_free(in_msg);
}
static void test_enc_dec_aoip_trasp_addr_v4()
{
struct sockaddr_storage enc_addr;
struct sockaddr_storage dec_addr;
struct sockaddr_in enc_addr_in;
struct msgb *msg;
uint8_t rc_enc;
int rc_dec;
memset(&enc_addr_in, 0, sizeof(enc_addr_in));
enc_addr_in.sin_family = AF_INET;
enc_addr_in.sin_port = htons(1234);
inet_aton("255.0.255.255", &enc_addr_in.sin_addr);
memset(&enc_addr, 0, sizeof(enc_addr));
memcpy(&enc_addr, &enc_addr_in, sizeof(enc_addr_in));
msg = msgb_alloc(1024, "output buffer");
rc_enc = gsm0808_enc_aoip_trasp_addr(msg, &enc_addr);
OSMO_ASSERT(rc_enc == 8);
rc_dec =
gsm0808_dec_aoip_trasp_addr(&dec_addr, msg->data + 2, msg->len - 2);
OSMO_ASSERT(rc_dec == 6);
OSMO_ASSERT(memcmp(&enc_addr, &dec_addr, sizeof(enc_addr)) == 0);
msgb_free(msg);
}
static void test_enc_dec_aoip_trasp_addr_v6()
{
struct sockaddr_storage enc_addr;
struct sockaddr_storage dec_addr;
struct sockaddr_in6 enc_addr_in;
struct msgb *msg;
uint8_t rc_enc;
int rc_dec;
memset(&enc_addr_in, 0, sizeof(enc_addr_in));
enc_addr_in.sin6_family = AF_INET6;
enc_addr_in.sin6_port = htons(4567);
inet_pton(AF_INET6, "2001:0db8:85a3:08d3:1319:8a2e:0370:7344",
&enc_addr_in.sin6_addr);
memset(&enc_addr, 0, sizeof(enc_addr));
memcpy(&enc_addr, &enc_addr_in, sizeof(enc_addr_in));
msg = msgb_alloc(1024, "output buffer");
rc_enc = gsm0808_enc_aoip_trasp_addr(msg, &enc_addr);
OSMO_ASSERT(rc_enc == 20);
rc_dec =
gsm0808_dec_aoip_trasp_addr(&dec_addr, msg->data + 2, msg->len - 2);
OSMO_ASSERT(rc_dec == 18);
OSMO_ASSERT(memcmp(&enc_addr, &dec_addr, sizeof(enc_addr)) == 0);
msgb_free(msg);
}
int main(int argc, char **argv)
{
printf("Testing generation of GSM0808 messages\n");
@ -263,6 +325,8 @@ int main(int argc, char **argv)
test_create_clear_rqst();
test_create_dtap();
test_prepend_dtap();
test_enc_dec_aoip_trasp_addr_v4();
test_enc_dec_aoip_trasp_addr_v6();
printf("Done\n");
return EXIT_SUCCESS;