[sccp] Implement parts of ITU SCCP for use in the A-Interface
include/sccp/sccp_types.h contain Q.713 and GSM definitions
include/sccp/sccp.h is the application interface resembling
the esentials of the UNIX socket interface.
src/sccp.c is the actual implementation of SCCP featuring
connection and UDT1 support.
tests/sccp/sccp.c is testing connection creation and formating
of the SCCP messages used by the A-interface. And
it contains a simple fuzzing test to test the
robustnes of the implementation.
diff --git a/openbsc/include/sccp/sccp_types.h b/openbsc/include/sccp/sccp_types.h
new file mode 100644
index 0000000..c6b1182
--- /dev/null
+++ b/openbsc/include/sccp/sccp_types.h
@@ -0,0 +1,383 @@
+/*
+ * ITU Q.713 defined types for SCCP
+ *
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef SCCP_TYPES_H
+#define SCCP_TYPES_H
+
+/* Table 1/Q.713 - SCCP message types */
+enum sccp_message_types {
+ SCCP_MSG_TYPE_CR = 1,
+ SCCP_MSG_TYPE_CC = 2,
+ SCCP_MSG_TYPE_CREF = 3,
+ SCCP_MSG_TYPE_RLSD = 4,
+ SCCP_MSG_TYPE_RLC = 5,
+ SCCP_MSG_TYPE_DT1 = 6,
+ SCCP_MSG_TYPE_DT2 = 7,
+ SCCP_MSG_TYPE_AK = 8,
+ SCCP_MSG_TYPE_UDT = 9,
+ SCCP_MSG_TYPE_UDTS = 10,
+ SCCP_MSG_TYPE_ED = 11,
+ SCCP_MSG_TYPE_EA = 12,
+ SCCP_MSG_TYPE_RSR = 13,
+ SCCP_MSG_TYPE_RSC = 14,
+ SCCP_MSG_TYPE_ERR = 15,
+ SCCP_MSG_TYPE_IT = 16,
+ SCCP_MSG_TYPE_XUDT = 17,
+ SCCP_MSG_TYPE_XUDTS = 18,
+ SCCP_MSG_TYPE_LUDT = 19,
+ SCCP_MSG_TYPE_LUDTS = 20
+};
+
+/* Table 2/Q.713 - SCCP parameter name codes */
+enum sccp_parameter_name_codes {
+ SCCP_PNC_END_OF_OPTIONAL = 0,
+ SCCP_PNC_DESTINATION_LOCAL_REFERENCE = 1,
+ SCCP_PNC_SOURCE_LOCAL_REFERENCE = 2,
+ SCCP_PNC_CALLED_PARTY_ADDRESS = 3,
+ SCCP_PNC_CALLING_PARTY_ADDRESS = 4,
+ SCCP_PNC_PROTOCOL_CLASS = 5,
+ SCCP_PNC_SEGMENTING = 6,
+ SCCP_PNC_RECEIVE_SEQ_NUMBER = 7,
+ SCCP_PNC_SEQUENCING = 8,
+ SCCP_PNC_CREDIT = 9,
+ SCCP_PNC_RELEASE_CAUSE = 10,
+ SCCP_PNC_RETURN_CAUSE = 11,
+ SCCP_PNC_RESET_CAUSE = 12,
+ SCCP_PNC_ERROR_CAUSE = 13,
+ SCCP_PNC_REFUSAL_CAUSE = 14,
+ SCCP_PNC_DATA = 15,
+ SCCP_PNC_SEGMENTATION = 16,
+ SCCP_PNC_HOP_COUNTER = 17,
+ SCCP_PNC_IMPORTANCE = 18,
+ SCCP_PNC_LONG_DATA = 19,
+};
+
+/* Figure 3/Q.713 Called/calling party address */
+enum {
+ SCCP_TITLE_IND_NONE = 0,
+ SCCP_TITLE_IND_NATURE_ONLY = 1,
+ SCCP_TITLE_IND_TRANSLATION_ONLY = 2,
+ SCCP_TITLE_IND_TRANS_NUM_ENC = 3,
+ SCCP_TITLE_IND_TRANS_NUM_ENC_NATURE = 4,
+};
+
+enum {
+ SCCP_CALL_ROUTE_ON_SSN = 1,
+ SCCP_CALL_ROUTE_ON_GT = 0,
+};
+
+struct sccp_called_party_address {
+ u_int8_t point_code_indicator : 1,
+ ssn_indicator : 1,
+ global_title_indicator : 4,
+ routing_indicator : 1,
+ reserved : 1;
+ u_int8_t data[0];
+} __attribute__((packed));
+
+/* indicator indicates presence in the above order */
+
+/* Figure 6/Q.713 */
+struct sccp_signalling_point_code {
+ u_int8_t lsb;
+ u_int8_t msb : 6,
+ reserved : 2;
+} __attribute__((packed));
+
+/* SSN == subsystem number */
+enum sccp_subsystem_number {
+ SCCP_SSN_NOT_KNOWN_OR_USED = 0,
+ SCCP_SSN_MANAGEMENT = 1,
+ SCCP_SSN_RESERVED_ITU = 2,
+ SCCP_SSN_ISDN_USER_PART = 3,
+ SCCP_SSN_OMAP = 4, /* operation, maint and administration part */
+ SCCP_SSN_MAP = 5, /* mobile application part */
+ SCCP_SSN_HLR = 6,
+ SCCP_SSN_VLR = 7,
+ SCCP_SSN_MSC = 8,
+ SCCP_SSN_EIC = 9, /* equipent identifier centre */
+ SCCP_SSN_AUC = 10, /* authentication centre */
+ SCCP_SSN_ISDN_SUPPL_SERVICES = 11,
+ SCCP_SSN_RESERVED_INTL = 12,
+ SCCP_SSN_ISDN_EDGE_TO_EDGE = 13,
+ SCCP_SSN_TC_TEST_RESPONDER = 14,
+
+ /* From GSM 03.03 8.2 */
+ SCCP_SSN_BSSAP = 254,
+ SCCP_SSN_BSSOM = 253,
+};
+
+/* Q.713, 3.4.2.3 */
+enum {
+ SCCP_NAI_UNKNOWN = 0,
+ SCCP_NAI_SUBSCRIBER_NUMBER = 1,
+ SCCP_NAI_RESERVED_NATIONAL = 2,
+ SCCP_NAI_NATIONAL_SIGNIFICANT = 3,
+ SCCP_NAI_INTERNATIONAL = 4,
+};
+
+struct sccp_global_title {
+ u_int8_t nature_of_addr_ind : 7,
+ odd_even : 1;
+ u_int8_t data[0];
+} __attribute__((packed));
+
+/* Q.713, 3.3 */
+struct sccp_source_reference {
+ u_int8_t octet1;
+ u_int8_t octet2;
+ u_int8_t octet3;
+} __attribute__((packed));
+
+/* Q.714, 3.6 */
+enum sccp_protocol_class {
+ SCCP_PROTOCOL_CLASS_0 = 0,
+ SCCP_PROTOCOL_CLASS_1 = 1,
+ SCCP_PROTOCOL_CLASS_2 = 2,
+ SCCP_PROTOCOL_CLASS_3 = 3,
+};
+
+/* bits 5-8 when class0, class1 is used */
+enum sccp_protocol_options {
+ SCCP_PROTOCOL_NO_SPECIAL = 0,
+ SCCP_PROTOCOL_RETURN_MESSAGE = 8,
+};
+
+enum sccp_release_cause {
+ SCCP_RELEASE_CAUSE_END_USER_ORIGINATED = 0,
+ SCCP_RELEASE_CAUSE_END_USER_CONGESTION = 1,
+ SCCP_RELEASE_CAUSE_END_USER_FAILURE = 2,
+ SCCP_RELEASE_CAUSE_SCCP_USER_ORIGINATED = 3,
+ SCCP_RELEASE_CAUSE_REMOTE_PROCEDURE_ERROR = 4,
+ SCCP_RELEASE_CAUSE_INCONSISTENT_CONN_DATA = 5,
+ SCCP_RELEASE_CAUSE_ACCESS_FAILURE = 6,
+ SCCP_RELEASE_CAUSE_ACCESS_CONGESTION = 7,
+ SCCP_RELEASE_CAUSE_SUBSYSTEM_FAILURE = 8,
+ SCCP_RELEASE_CAUSE_SUBSYSTEM_CONGESTION = 9,
+ SCCP_RELEASE_CAUSE_MTP_FAILURE = 10,
+ SCCP_RELEASE_CAUSE_NETWORK_CONGESTION = 11,
+ SCCP_RELEASE_CAUSE_EXPIRATION_RESET = 12,
+ SCCP_RELEASE_CAUSE_EXPIRATION_INACTIVE = 13,
+ SCCP_RELEASE_CAUSE_RESERVED = 14,
+ SCCP_RELEASE_CAUSE_UNQUALIFIED = 15,
+ SCCP_RELEASE_CAUSE_SCCP_FAILURE = 16,
+};
+
+enum sccp_return_cause {
+ SCCP_RETURN_CAUSE_NO_TRANSLATION_NATURE = 0,
+ SCCP_RETURN_CAUSE_NO_TRANSLATION = 1,
+ SCCP_RETURN_CAUSE_SUBSYSTEM_CONGESTION = 2,
+ SCCP_RETURN_CAUSE_SUBSYSTEM_FAILURE = 3,
+ SCCP_RETURN_CAUSE_UNEQUIPPED_USER = 4,
+ SCCP_RETURN_CAUSE_MTP_FAILURE = 5,
+ SCCP_RETURN_CAUSE_NETWORK_CONGESTION = 6,
+ SCCP_RETURN_CAUSE_UNQUALIFIED = 7,
+ SCCP_RETURN_CAUSE_ERROR_IN_MSG_TRANSPORT = 8,
+ SCCP_RETURN_CAUSE_ERROR_IN_LOCAL_PROCESSING = 9,
+ SCCP_RETURN_CAUSE_DEST_CANNOT_PERFORM_REASSEMBLY = 10,
+ SCCP_RETURN_CAUSE_SCCP_FAILURE = 11,
+ SCCP_RETURN_CAUSE_HOP_COUNTER_VIOLATION = 12,
+ SCCP_RETURN_CAUSE_SEGMENTATION_NOT_SUPPORTED= 13,
+ SCCP_RETURN_CAUSE_SEGMENTATION_FAOLURE = 14
+};
+
+enum sccp_reset_cause {
+ SCCP_RESET_CAUSE_END_USER_ORIGINATED = 0,
+ SCCP_RESET_CAUSE_SCCP_USER_ORIGINATED = 1,
+ SCCP_RESET_CAUSE_MSG_OUT_OF_ORDER_PS = 2,
+ SCCP_RESET_CAUSE_MSG_OUT_OF_ORDER_PR = 3,
+ SCCP_RESET_CAUSE_RPC_OUT_OF_WINDOW = 4,
+ SCCP_RESET_CAUSE_RPC_INCORRECT_PS = 5,
+ SCCP_RESET_CAUSE_RPC_GENERAL = 6,
+ SCCP_RESET_CAUSE_REMOTE_END_USER_OPERATIONAL= 7,
+ SCCP_RESET_CAUSE_NETWORK_OPERATIONAL = 8,
+ SCCP_RESET_CAUSE_ACCESS_OPERATIONAL = 9,
+ SCCP_RESET_CAUSE_NETWORK_CONGESTION = 10,
+ SCCP_RESET_CAUSE_RESERVED = 11,
+};
+
+enum sccp_error_cause {
+ SCCP_ERROR_LRN_MISMATCH_UNASSIGNED = 0, /* local reference number */
+ SCCP_ERROR_LRN_MISMATCH_INCONSISTENT = 1,
+ SCCP_ERROR_POINT_CODE_MISMATCH = 2,
+ SCCP_ERROR_SERVICE_CLASS_MISMATCH = 3,
+ SCCP_ERROR_UNQUALIFIED = 4,
+};
+
+enum sccp_refusal_cause {
+ SCCP_REFUSAL_END_USER_ORIGINATED = 0,
+ SCCP_REFUSAL_END_USER_CONGESTION = 1,
+ SCCP_REFUSAL_END_USER_FAILURE = 2,
+ SCCP_REFUSAL_SCCP_USER_ORIGINATED = 3,
+ SCCP_REFUSAL_DESTINATION_ADDRESS_UKNOWN = 4,
+ SCCP_REFUSAL_DESTINATION_INACCESSIBLE = 5,
+ SCCP_REFUSAL_NET_QOS_NON_TRANSIENT = 6,
+ SCCP_REFUSAL_NET_QOS_TRANSIENT = 7,
+ SCCP_REFUSAL_ACCESS_FAILURE = 8,
+ SCCP_REFUSAL_ACCESS_CONGESTION = 9,
+ SCCP_REFUSAL_SUBSYSTEM_FAILURE = 10,
+ SCCP_REFUSAL_SUBSYTEM_CONGESTION = 11,
+ SCCP_REFUSAL_EXPIRATION = 12,
+ SCCP_REFUSAL_INCOMPATIBLE_USER_DATA = 13,
+ SCCP_REFUSAL_RESERVED = 14,
+ SCCP_REFUSAL_UNQUALIFIED = 15,
+ SCCP_REFUSAL_HOP_COUNTER_VIOLATION = 16,
+ SCCP_REFUSAL_SCCP_FAILURE = 17,
+ SCCP_REFUSAL_UNEQUIPPED_USER = 18,
+};
+
+/*
+ * messages... as of Q.713 Chapter 4
+ */
+struct sccp_connection_request {
+ /* mandantory */
+ u_int8_t type;
+ struct sccp_source_reference source_local_reference;
+ u_int8_t proto_class;
+
+
+ /* variable */
+ u_int8_t variable_called;
+#if VARIABLE
+ called_party_address
+#endif
+
+ /* optional */
+ u_int8_t optional_start;
+
+#if OPTIONAL
+ credit 3
+ callingparty var 4-n
+ data 3-130
+ hop_counter 3
+ importance 3
+ end_of_optional 1
+#endif
+
+ u_int8_t data[0];
+} __attribute__((packed));
+
+struct sccp_connection_confirm {
+ /* mandantory */
+ u_int8_t type;
+ struct sccp_source_reference destination_local_reference;
+ struct sccp_source_reference source_local_reference;
+ u_int8_t proto_class;
+
+ /* optional */
+ u_int8_t optional_start;
+
+ /* optional */
+#if OPTIONAL
+ credit 3
+ called party 4
+ data 3-130
+ importance 3
+ end_of_optional 1
+#endif
+
+ u_int8_t data[0];
+} __attribute__((packed));
+
+struct sccp_connection_refused {
+ /* mandantory */
+ u_int8_t type;
+ struct sccp_source_reference destination_local_reference;
+ u_int8_t cause;
+
+ /* optional */
+ u_int8_t optional_start;
+
+ /* optional */
+#if OPTIONAL
+ called party 4
+ data 3-130
+ importance 3
+ end_of_optional 1
+#endif
+
+ u_int8_t data[0];
+} __attribute__((packed));
+
+struct sccp_connection_released {
+ /* mandantory */
+ u_int8_t type;
+ struct sccp_source_reference destination_local_reference;
+ struct sccp_source_reference source_local_reference;
+ u_int8_t release_cause;
+
+
+ /* optional */
+ u_int8_t optional_start;
+
+#if OPTIONAL
+ data 3-130
+ importance 3
+ end_of_optional 1
+#endif
+ u_int8_t data[0];
+} __attribute__((packed));
+
+struct sccp_connection_release_complete {
+ u_int8_t type;
+ struct sccp_source_reference destination_local_reference;
+ struct sccp_source_reference source_local_reference;
+} __attribute__((packed));
+
+struct sccp_data_form1 {
+ /* mandantory */
+ u_int8_t type;
+ struct sccp_source_reference destination_local_reference;
+ u_int8_t segmenting;
+
+ /* variable */
+ u_int8_t variable_start;
+
+#if VARIABLE
+ data 2-256;
+#endif
+
+ u_int8_t data[0];
+} __attribute__((packed));
+
+
+struct sccp_data_unitdata {
+ /* mandantory */
+ u_int8_t type;
+ u_int8_t proto_class;
+
+
+ /* variable */
+ u_int8_t variable_called;
+ u_int8_t variable_calling;
+ u_int8_t variable_data;
+
+#if VARIABLE
+ called party address
+ calling party address
+#endif
+
+ u_int8_t data[0];
+} __attribute__((packed));
+
+#endif