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authorPhilipp Maier <pmaier@sysmocom.de>2017-03-24 17:59:26 +0100
committerHarald Welte <laforge@gnumonks.org>2017-04-08 07:44:45 +0000
commit22401433aad9f19074229f00d4f3b091de4804ce (patch)
tree4155e659ad957a9b475762a2d78a8ba8b409e3f6
parentf7add0889c80f9f94af9985a752375e13f713cd9 (diff)
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
-rw-r--r--include/Makefile.am1
-rw-r--r--include/osmocom/gsm/gsm0808_utils.h30
-rw-r--r--src/gsm/Makefile.am2
-rw-r--r--src/gsm/gsm0808_utils.c122
-rw-r--r--src/gsm/libosmogsm.map2
-rw-r--r--tests/gsm0808/gsm0808_test.c64
6 files changed, 220 insertions, 1 deletions
diff --git a/include/Makefile.am b/include/Makefile.am
index e2a1b127..0383d7ad 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -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 \
diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
new file mode 100644
index 00000000..5fc1c880
--- /dev/null
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -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);
diff --git a/src/gsm/Makefile.am b/src/gsm/Makefile.am
index 3a4a0cd3..e64c9e79 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/Makefile.am
@@ -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
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c
new file mode 100644
index 00000000..df24e2b8
--- /dev/null
+++ b/src/gsm/gsm0808_utils.c
@@ -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);
+}
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 5649e715..3ad847de 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -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;
diff --git a/tests/gsm0808/gsm0808_test.c b/tests/gsm0808/gsm0808_test.c
index 98502b75..26bd1d60 100644
--- a/tests/gsm0808/gsm0808_test.c
+++ b/tests/gsm0808/gsm0808_test.c
@@ -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;