1 files changed, 70 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/oap_messages.h b/openbsc/include/openbsc/oap_messages.h
new file mode 100644
index 000000000..a7a254c2e
--- /dev/null
+++ b/openbsc/include/openbsc/oap_messages.h
@@ -0,0 +1,70 @@
+/* Osmocom Authentication Protocol message encoder/decoder */
+
+/* (C) 2015 by Sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * 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 <stdint.h>
+#include <openbsc/gsm_04_08_gprs.h>
+#include <openbsc/gsm_data.h>
+
+/* Some numbers are out of sequence because (so far) they match gprs_gsup_iei.
+ */
+enum oap_iei {
+	OAP_CAUSE_IE			= 0x02,
+	OAP_RAND_IE			= 0x20,
+	OAP_AUTN_IE			= 0x23,
+	OAP_XRES_IE			= 0x24,
+	OAP_AUTS_IE			= 0x25,
+	OAP_CLIENT_ID_IE		= 0x30,
+};
+
+enum oap_message_type {
+	OAP_MSGT_REGISTER_REQUEST	= 0b00000100,
+	OAP_MSGT_REGISTER_ERROR		= 0b00000101,
+	OAP_MSGT_REGISTER_RESULT	= 0b00000110,
+
+	OAP_MSGT_CHALLENGE_REQUEST	= 0b00001000,
+	OAP_MSGT_CHALLENGE_ERROR	= 0b00001001,
+	OAP_MSGT_CHALLENGE_RESULT	= 0b00001010,
+
+	OAP_MSGT_SYNC_REQUEST		= 0b00001100,
+	OAP_MSGT_SYNC_ERROR		= 0b00001101,
+	OAP_MSGT_SYNC_RESULT		= 0b00001110,
+};
+
+struct oap_message {
+	enum oap_message_type	message_type;
+	enum gsm48_gmm_cause	cause;
+	uint16_t		client_id;
+	int			rand_present;
+	uint8_t			rand[16];
+	int			autn_present;
+	uint8_t			autn[16];
+	int			xres_present;
+	uint8_t			xres[8];
+	int			auts_present;
+	uint8_t			auts[16];
+};
+
+int oap_decode(const uint8_t *data, size_t data_len,
+	       struct oap_message *oap_msg);
+void oap_encode(struct msgb *msg, const struct oap_message *oap_msg);
+