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[sccp] Ansi support #29

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merged 4 commits into from
Aug 9, 2024
Merged

[sccp] Ansi support #29

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7e93632
[sccp] ansi addressing
sebastiw Aug 6, 2024
c4ca56d
[sccp] ansi parameters
sebastiw Aug 7, 2024
1ca6eda
[sccp] ansi management messages
sebastiw Aug 7, 2024
811493e
[sccp] ansi return causes
sebastiw Aug 7, 2024
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19 changes: 19 additions & 0 deletions include/sccp.hrl
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,11 @@
-define(SCCP_IEI_HOP_COUNTER, 2#00010001).
-define(SCCP_IEI_IMPORTANCE, 2#00010010).
-define(SCCP_IEI_LONG_DATA, 2#00010011).
%% ANSI T1.112.3
-define(SCCP_IEI_ANSI_MESSAGE_TYPE_INTERWORKING, 2#11111000).
-define(SCCP_IEI_ANSI_INTERMEDIATE_NETWORK_SELECTION, 2#11111001).
-define(SCCP_IEI_ANSI_INTERMEDIATE_SIGNALING_NETWORK_IDENTIFICATION, 2#11111010).


%% 3.4.2.2 Subsystem number
-define(SCCP_SSN_UNKNOWN, 2#00000000).
Expand Down Expand Up @@ -117,6 +122,16 @@
-define(SCCP_IEI_RETURN_CAUSE_HOP_COUNTER_VIOLATION, 2#0000_1100).
-define(SCCP_IEI_RETURN_CAUSE_SEGMENTATION_NOT_SUPPORTED, 2#0000_1101).
-define(SCCP_IEI_RETURN_CAUSE_SEGMENTATION_FAILURE, 2#0000_1110).
%% T1.112.3
-define(SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_CHANGE_FAILURE, 2#1111_0111).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_INS_ROUTING_REQUEST, 2#1111_1000).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_ISNI_ROUTING_REQUEST, 2#1111_1001).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_UNAUTHORIZED_MESSAGE, 2#1111_1010).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_INCOMPATIBILITY, 2#1111_1011).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_CONSTRAINED_ROUTING, 2#1111_1100).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_REDUNDANT_ISNI_CONSTRAINED_ROUTING_INFORMATION, 2#1111_1101).
-define(SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_IDENTIFICATION, 2#1111_1110).


%% 3.13 Reset cause
-define(SCCP_IEI_RESET_CAUSE_END_USER_ORIGINATED, 2#0000_0000).
Expand Down Expand Up @@ -169,3 +184,7 @@
-define(SCCP_SCMG_SUBSYSTEM_OUT_OF_SERVICE_REQUEST, 2#0000_0100).
-define(SCCP_SCMG_SUBSYSTEM_OUT_OF_SERVICE_GRANT, 2#0000_0101).
-define(SCCP_SCMG_SUBSYSTEM_CONGESTED, 2#0000_0110).
%% T1.112.2
-define(SCCP_SCMG_ANSI_SUBSYSTEM_BACKUP_ROUTING, 2#11111101).
-define(SCCP_SCMG_ANSI_SUBSYSTEM_NORMAL_ROUTING, 2#11111110).
-define(SCCP_SCMG_ANSI_SUBSYSTEM_ROUTING_STATUS_TEST, 2#11111111).
1 change: 0 additions & 1 deletion src/otc_m3ua.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -838,7 +838,6 @@ compose_network_indicator(national) -> ?MTP3_NETIND_NATIONAL;
compose_network_indicator(national_spare) -> ?MTP3_NETIND_NATIONAL_SPARE;
compose_network_indicator({reserved, R}) -> R.


-spec decode_point_code({binary(), binary()}) -> [itu_point_code() | ansi_point_code()].
decode_point_code({<<Mask:8/big>>, <<PCbin:24/big>>}) ->
MaskBits = trunc(math:pow(2, Mask) - 1),
Expand Down
218 changes: 197 additions & 21 deletions src/otc_sccp.erl
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -324,8 +324,8 @@ decode_msg(xudt, Bin, Opts) ->
<<PC:1/binary, HC:1/binary, Bin1/binary>> = Bin,
[CdPA, CgPA, D, OptBin] = separate_fields(absolute_pointers(Bin1, NumPointers, true)),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(Opts)],
CalledPartyAddress = decode_parameter(called_party_address, CdPA, Opts),
CallingPartyAddress = decode_parameter(calling_party_address, CgPA, Opts),
Optionals = decode_parameters(OptBin, AllowedParameters, Opts),
Expand All @@ -339,8 +339,8 @@ decode_msg(xudts, Bin, Opts) ->
<<RC:1/binary, HC:1/binary, Bin1/binary>> = Bin,
[CdPA, CgPA, D, OptBin] = separate_fields(absolute_pointers(Bin1, NumPointers, true)),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(Opts)],
CalledPartyAddress = decode_parameter(called_party_address, CdPA, Opts),
CallingPartyAddress = decode_parameter(calling_party_address, CgPA, Opts),
Optionals = decode_parameters(OptBin, AllowedParameters, Opts),
Expand All @@ -361,8 +361,8 @@ decode_msg(ludt, Bin, Opts) ->
LD = binary:part(Bin1, LDP+1, LDL-1),
OptBin = binary:part(Bin1, byte_size(Bin1), -OptBinP),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(Opts)],
CalledPartyAddress = decode_parameter(called_party_address, CdPA, Opts),
CallingPartyAddress = decode_parameter(calling_party_address, CgPA, Opts),
Optionals = decode_parameters(OptBin, AllowedParameters, Opts),
Expand All @@ -383,8 +383,8 @@ decode_msg(ludts, Bin, Opts) ->
LD = binary:part(Bin1, LDP+1, LDL-1),
OptBin = binary:part(Bin1, byte_size(Bin1), -OptBinP),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(Opts)],
CalledPartyAddress = decode_parameter(called_party_address, CdPA, Opts),
CallingPartyAddress = decode_parameter(calling_party_address, CgPA, Opts),
Optionals = decode_parameters(OptBin, AllowedParameters, Opts),
Expand All @@ -394,7 +394,6 @@ decode_msg(ludts, Bin, Opts) ->
calling_party_address => CallingPartyAddress,
long_data => LD}.


absolute_pointers(Bin, NumPointers) ->
absolute_pointers(Bin, NumPointers, false).

Expand Down Expand Up @@ -786,8 +785,8 @@ encode_msg(xudt,
CgPALen = byte_size(CgPA),
DLen = byte_size(D),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(#{address_type => ansi})],
OptBin = encode_parameters(Msg, AllowedParameters),
OptPointer = case byte_size(OptBin) > 0 of
true ->
Expand All @@ -813,8 +812,8 @@ encode_msg(xudts,
CgPALen = byte_size(CgPA),
DLen = byte_size(D),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(#{address_type => ansi})],
OptBin = encode_parameters(Msg, AllowedParameters),
OptPointer = case byte_size(OptBin) > 0 of
true ->
Expand All @@ -840,8 +839,8 @@ encode_msg(ludt,
CgPALen = byte_size(CgPA),
LDLen = byte_size(LD),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(#{address_type => ansi})],
OptBin = encode_parameters(Msg, AllowedParameters),
OptPointer = case byte_size(OptBin) > 0 of
true ->
Expand All @@ -867,8 +866,8 @@ encode_msg(ludts,
CgPALen = byte_size(CgPA),
LDLen = byte_size(LD),
AllowedParameters = [{segmentation, 6},
{importance, 3},
{end_of_optional_parameters, 1}],
{importance, 3}
|ansi_parameters(#{address_type => ansi})],
OptBin = encode_parameters(Msg, AllowedParameters),
OptPointer = case byte_size(OptBin) > 0 of
true ->
Expand All @@ -881,6 +880,15 @@ encode_msg(ludts,
CdPALen:8/big, CdPA/binary, CgPALen:8/big, CgPA/binary, LDLen:16/big, LD/binary,
OptBin/binary>>.

ansi_parameters(#{address_type := ansi}) ->
[{intermediate_signaling_network_identification, {3, 18}},
{intermediate_network_selection, {5, 7}},
{message_type_interworking, 2},
{end_of_optional_parameters, 1}
];
ansi_parameters(_) ->
[{end_of_optional_parameters, 1}].

decode_parameters(Bin, Parameters, Opts) ->
decode_parameters(Bin, Parameters, #{}, Opts).

Expand Down Expand Up @@ -938,7 +946,10 @@ parse_iei(?SCCP_IEI_CREDIT) -> credit;
parse_iei(?SCCP_IEI_DATA) -> data;
parse_iei(?SCCP_IEI_SEGMENTATION) -> segmentation;
parse_iei(?SCCP_IEI_HOP_COUNTER) -> hop_counter;
parse_iei(?SCCP_IEI_IMPORTANCE) -> importance.
parse_iei(?SCCP_IEI_IMPORTANCE) -> importance;
parse_iei(?SCCP_IEI_ANSI_INTERMEDIATE_SIGNALING_NETWORK_IDENTIFICATION) -> intermediate_signaling_network_identification;
parse_iei(?SCCP_IEI_ANSI_INTERMEDIATE_NETWORK_SELECTION) -> intermediate_network_selection;
parse_iei(?SCCP_IEI_ANSI_MESSAGE_TYPE_INTERWORKING) -> message_type_interworking.

%% compose_iei(destination_local_reference) -> ?SCCP_IEI_DESTINATION_LOCAL_REFERENCE;
%% compose_iei(source_local_reference) -> ?SCCP_IEI_SOURCE_LOCAL_REFERENCE;
Expand All @@ -958,7 +969,10 @@ compose_iei(credit) -> ?SCCP_IEI_CREDIT;
compose_iei(data) -> ?SCCP_IEI_DATA;
compose_iei(segmentation) -> ?SCCP_IEI_SEGMENTATION;
compose_iei(hop_counter) -> ?SCCP_IEI_HOP_COUNTER;
compose_iei(importance) -> ?SCCP_IEI_IMPORTANCE.
compose_iei(importance) -> ?SCCP_IEI_IMPORTANCE;
compose_iei(intermediate_signaling_network_identification) -> ?SCCP_IEI_ANSI_INTERMEDIATE_SIGNALING_NETWORK_IDENTIFICATION;
compose_iei(intermediate_network_selection) -> ?SCCP_IEI_ANSI_INTERMEDIATE_NETWORK_SELECTION;
compose_iei(message_type_interworking) -> ?SCCP_IEI_ANSI_MESSAGE_TYPE_INTERWORKING.

decode_parameter(destination_local_reference, Bin, _Opts) ->
Bin;
Expand Down Expand Up @@ -1029,6 +1043,58 @@ decode_parameter(importance, Bin, _Opts) ->
Importance;
decode_parameter(long_data, Bin, _Opts) ->
Bin;
decode_parameter(intermediate_signaling_network_identification, Bin, _Opts) ->
<<Counter:3, TI:1, _Res:1, IRI:2, MI:1, RCE:TI/binary, NIDs/binary>> = Bin,
NS = case RCE of
<<>> ->
#{};
<<_:6, NetSpec:2>> ->
#{network_specific => NetSpec}
end,
NetworkIDs = [NI || <<NI:2/binary>> <= NIDs],
NS#{counter => Counter,
network_identifiers => NetworkIDs,
isni_routing_identificator => case IRI of
2#00 -> neither_constrained_nor_suggested;
2#01 -> constrained;
2#10 -> reserved;
2#11 -> spare
end,
identify_networks => 1 =:= MI};
decode_parameter(intermediate_network_selection, Bin, _Opts) ->
<<Counter:2, _Res:2, ToR:2, IT:2, NIDs/binary>> = Bin,
NetworkIDs = case byte_size(NIDs) of
4 ->
<<NI1:2/binary, NI2:2/binary>> = NIDs,
[NI1, NI2];
2 ->
[NIDs]
end,
#{counter => Counter,
network_identifiers => NetworkIDs,
type_of_routing => case ToR of
2#00 -> neither_constrained_nor_suggested;
2#01 -> constrained;
2#10 -> suggested;
2#11 -> reserved
end,
information_type => case IT of
2#00 -> ss7;
2#01 -> reserved;
_ -> {network_specific, IT}
end
};
decode_parameter(message_type_interworking, Bin, _Opts) ->
<<_Res:1, Drop:1, _Spare:3, OMT:3>> = Bin,
#{parameter_can_be_dropped => 1 =:= Drop,
original_message_type => case OMT of
2#000 -> unqualified;
2#001 -> udt;
2#010 -> xudt;
2#011 -> ludt;
_ -> spare
end
};
decode_parameter(_, _, _Opts) ->
undefined.

Expand Down Expand Up @@ -1103,6 +1169,14 @@ parse_return_cause(?SCCP_IEI_RETURN_CAUSE_SCCP_FAILURE) -> sccp_failure;
parse_return_cause(?SCCP_IEI_RETURN_CAUSE_HOP_COUNTER_VIOLATION) -> hop_counter_violation;
parse_return_cause(?SCCP_IEI_RETURN_CAUSE_SEGMENTATION_NOT_SUPPORTED) -> segmentation_not_supported;
parse_return_cause(?SCCP_IEI_RETURN_CAUSE_SEGMENTATION_FAILURE) -> segmentation_failure;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_CHANGE_FAILURE) -> message_change_failure;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_INS_ROUTING_REQUEST) -> invalid_ins_routing_request;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_ISNI_ROUTING_REQUEST) -> invalid_isni_routing_request;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_UNAUTHORIZED_MESSAGE) -> unauthorized_message;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_INCOMPATIBILITY) -> message_incompatibility;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_CONSTRAINED_ROUTING) -> insi_constrained_routing;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_REDUNDANT_ISNI_CONSTRAINED_ROUTING_INFORMATION) -> redundant_isni_constrained_routing_information;
parse_return_cause(?SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_IDENTIFICATION) -> isni_identification;
parse_return_cause(V) when V >= 2#0000_1111; V =< 2#1110_0100 -> {reserved_international, V};
parse_return_cause(V) when V >= 2#1110_0101; V =< 2#1111_1110 -> {reserved_national, V};
parse_return_cause(V) -> {reserved, V}.
Expand All @@ -1122,6 +1196,14 @@ compose_return_cause(sccp_failure) -> ?SCCP_IEI_RETURN_CAUSE_SCCP_FAILURE;
compose_return_cause(hop_counter_violation) -> ?SCCP_IEI_RETURN_CAUSE_HOP_COUNTER_VIOLATION;
compose_return_cause(segmentation_not_supported) -> ?SCCP_IEI_RETURN_CAUSE_SEGMENTATION_NOT_SUPPORTED;
compose_return_cause(segmentation_failure) -> ?SCCP_IEI_RETURN_CAUSE_SEGMENTATION_FAILURE;
compose_return_cause(message_change_failure) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_CHANGE_FAILURE;
compose_return_cause(invalid_ins_routing_request) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_INS_ROUTING_REQUEST;
compose_return_cause(invalid_isni_routing_request) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_INVALID_ISNI_ROUTING_REQUEST;
compose_return_cause(unauthorized_message) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_UNAUTHORIZED_MESSAGE;
compose_return_cause(message_incompatibility) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_MESSAGE_INCOMPATIBILITY;
compose_return_cause(insi_constrained_routing) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_CONSTRAINED_ROUTING;
compose_return_cause(redundant_isni_constrained_routing_information) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_REDUNDANT_ISNI_CONSTRAINED_ROUTING_INFORMATION;
compose_return_cause(isni_identification) -> ?SCCP_IEI_ANSI_RETURN_CAUSE_ISNI_IDENTIFICATION;
compose_return_cause({reserved_international, V}) -> V;
compose_return_cause({reserved_national, V}) -> V;
compose_return_cause({reserved, V}) -> V.
Expand Down Expand Up @@ -1273,7 +1355,7 @@ encode_parameter(refusal_cause, RC) ->
encode_parameter(data, Bin) ->
Bin;
encode_parameter(segmentation, V) ->
F = case maps:get(first_segment_indication, V, true) of
F = case maps:get(first_segment_indication, V, true) of
true ->
0;
_ ->
Expand All @@ -1289,11 +1371,105 @@ encode_parameter(hop_counter, HC) ->
encode_parameter(importance, Importance) ->
<<0:5, Importance:3>>;
encode_parameter(long_data, Bin) ->
Bin.
Bin;
encode_parameter(intermediate_signaling_network_identification, V) ->
#{counter := Counter,
network_identifiers := NetworkIDs,
isni_routing_identificator := RoutingID,
identify_networks := IN} = V,
IRI = case RoutingID of
neither_constrained_nor_suggested -> 2#00;
constrained -> 2#01;
reserved -> 2#10;
spare -> 2#11
end,

RCE = case maps:get(network_specific, V, undefined) of
undefined ->
<<>>;
NetSpec ->
<<0:6, NetSpec:2>>
end,
TI = byte_size(RCE),
NIDs = binary:list_to_bin(NetworkIDs),
MI = otc_util:true_to_one(IN),
<<Counter:3, TI:1, 0:1, IRI:2, MI:1, RCE:TI/binary, NIDs/binary>>;
encode_parameter(intermediate_network_selection, V) ->
#{counter := Counter,
network_identifiers := NetworkIDs,
type_of_routing := TypeOfRouting,
information_type := InformationType
} = V,
ToR = case TypeOfRouting of
neither_constrained_nor_suggested -> 2#00;
constrained -> 2#01;
suggested -> 2#10;
reserved -> 2#11
end,
IT = case InformationType of
ss7 -> 2#00;
reserved -> 2#01;
{network_specific, I} -> I
end,
NIDs = binary:list_to_bin(NetworkIDs),
<<Counter:2, 0:2, ToR:2, IT:2, NIDs/binary>>;
encode_parameter(message_type_interworking, V) ->
#{parameter_can_be_dropped := D,
original_message_type := OriginalMessageType
} = V,
Drop = otc_util:true_to_one(D),
OMT = case OriginalMessageType of
unqualified -> 2#000;
udt -> 2#001;
xudt -> 2#010;
ludt -> 2#011;
spare -> 2#111
end,
<<0:1, Drop:1, 0:3, OMT:3>>.

decode_address(Bin, #{address_type := ansi}) ->
decode_ansi_address(Bin);
decode_address(Bin, _Opts) ->
decode_itu_address(Bin).

%% T1.112.3
decode_ansi_address(<<NR:1, RI:1, GTI:4, PCI:1, SSNI:1, Bin0/binary>>) ->
{SSN, Bin1} = case SSNI of
0 -> {undefined, Bin0};
1 -> <<SSN0:8/big, Rest0/binary>> = Bin0,
{parse_ssn(SSN0), Rest0}
end,
{PC, Bin2} = case PCI of
0 -> {undefined, Bin1};
1 -> <<NCM:8, NC:8, NI:8, Rest1/binary>> = Bin1,
{<<NI:8, NC:8, NCM:8>>, Rest1}
end,
GT = case GTI of
2#0001 ->
%% global title includes translation type,
%% numbering plan and encoding scheme
<<TT:8/big, NP:4, ES:4, GT0/binary>> = Bin2,
GT1 = decode_gt_part(ES, GT0),
GT1#{translation_type => TT,
numbering_plan => NP};
2#0010 ->
%% global title includes translation type
%% only
<<TT:8/big, GT0/binary>> = Bin2,
#{translation_type => TT,
address => GT0}
end,
RoutingInd = case RI of
1 -> subsystem_number;
0 -> global_title
end,
#{national_use_indicator => 1 =:= NR,
routing_indicator => RoutingInd,
global_title => GT,
subsystem_number => SSN,
point_code => PC
}.

decode_itu_address(<<NR:1, RI:1, GTI:4, SSNI:1, PCI:1, Bin0/binary>>) ->
{PC, Bin1} = case PCI of
0 -> {undefined, Bin0};
Expand Down
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