diff options
Diffstat (limited to 'lib/diameter/src/base/diameter_traffic.erl')
| -rw-r--r-- | lib/diameter/src/base/diameter_traffic.erl | 622 |
1 files changed, 340 insertions, 282 deletions
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl index 0de3825943..f527f7c754 100644 --- a/lib/diameter/src/base/diameter_traffic.erl +++ b/lib/diameter/src/base/diameter_traffic.erl @@ -20,7 +20,7 @@ %% %% Implements the handling of incoming and outgoing Diameter messages %% except CER/CEA, DWR/DWA and DPR/DPA. That is, the messages that a -%% diameter client sends of receives. +%% diameter client sends and receives. %% -module(diameter_traffic). @@ -38,7 +38,7 @@ failover/1, pending/1]). -%% Other callbacks. +%% towards ?MODULE -export([send/1]). %% send from remote node -include_lib("diameter/include/diameter.hrl"). @@ -187,37 +187,42 @@ recv_request(TPid, Dict0, #recvdata{peerT = PeerT, apps = Apps} = RecvData) -> - recv_request(diameter_service:find_incoming_app(PeerT, TPid, Id, Apps), - TPid, - Pkt, - Dict0, - RecvData). - -%% recv_request/5 - -recv_request({#diameter_app{id = Id, dictionary = Dict} = App, Caps}, - TPid, - Pkt, - Dict0, - RecvData) -> - recv_R(App, + send_A(recv_R(diameter_service:find_incoming_app(PeerT, TPid, Id, Apps), + TPid, + Pkt, + Dict0, + RecvData), TPid, - Caps, Dict0, - RecvData, - diameter_codec:decode(Id, Dict, Pkt)); + RecvData). + +%% recv_R/5 + +recv_R({#diameter_app{id = Id, dictionary = Dict} = App, Caps}, + TPid, + Pkt0, + Dict0, + RecvData) -> + Pkt = errors(Id, diameter_codec:decode(Id, Dict, Pkt0)), + {Caps, Pkt, App, recv_R(App, TPid, Dict0, Caps, RecvData, Pkt)}; %% Note that the decode is different depending on whether or not Id is %% ?APP_ID_RELAY. %% DIAMETER_APPLICATION_UNSUPPORTED 3007 %% A request was sent for an application that is not supported. -recv_request(#diameter_caps{} = Caps, TPid, Pkt, Dict0, _) -> - As = collect_avps(Pkt), - protocol_error(3007, TPid, Caps, Dict0, Pkt#diameter_packet{avps = As}); +recv_R(#diameter_caps{} + = Caps, + _TPid, + #diameter_packet{errors = Es} + = Pkt, + _Dict0, + _RecvData) -> + {Caps, Pkt#diameter_packet{avps = collect_avps(Pkt), + errors = [3007 | Es]}}; -recv_request(false, _, _, _, _) -> %% transport has gone down - ok. +recv_R(false = No, _, _, _, _) -> %% transport has gone down + No. collect_avps(Pkt) -> case diameter_codec:collect_avps(Pkt) of @@ -229,98 +234,51 @@ collect_avps(Pkt) -> %% recv_R/6 -%% Wrong number of bits somewhere in the message: reply. -%% -%% DIAMETER_INVALID_AVP_BITS 3009 -%% A request was received that included an AVP whose flag bits are -%% set to an unrecognized value, or that is inconsistent with the -%% AVP's definition. -%% -recv_R(_App, - TPid, - Caps, - Dict0, - _RecvData, - #diameter_packet{errors = [Bs | _]} = Pkt) - when is_bitstring(Bs) -> - protocol_error(3009, TPid, Caps, Dict0, Pkt); - -%% Either we support this application but don't recognize the command -%% or we're a relay and the command isn't proxiable. -%% -%% DIAMETER_COMMAND_UNSUPPORTED 3001 -%% The Request contained a Command-Code that the receiver did not -%% recognize or support. This MUST be used when a Diameter node -%% receives an experimental command that it does not understand. -%% -recv_R(#diameter_app{id = Id}, - TPid, - Caps, +%% Answer errors ourselves ... +recv_R(#diameter_app{options = [_, {request_errors, E} | _]}, + _TPid, Dict0, + _Caps, _RecvData, - #diameter_packet{header = #diameter_header{is_proxiable = P}, - msg = M} - = Pkt) - when ?APP_ID_RELAY /= Id, undefined == M; - ?APP_ID_RELAY == Id, not P -> - protocol_error(3001, TPid, Caps, Dict0, Pkt); - -%% Error bit was set on a request. -%% -%% DIAMETER_INVALID_HDR_BITS 3008 -%% A request was received whose bits in the Diameter header were -%% either set to an invalid combination, or to a value that is -%% inconsistent with the command code's definition. -%% -recv_R(_App, + #diameter_packet{errors = [RC|_]}) %% a detected 3xxx is hd + when E == answer, (Dict0 /= ?BASE orelse 3 == RC div 1000); + E == answer_3xxx, 3 == RC div 1000 -> + {{answer_message, rc(RC)}, [], []}; + +%% ... or make a handle_request callback. Note that +%% Pkt#diameter_packet.msg = undefined in the 3001 case. +recv_R(App, TPid, + _Dict0, Caps, - Dict0, - _RecvData, - #diameter_packet{header = #diameter_header{is_error = true}} - = Pkt) -> - protocol_error(3008, TPid, Caps, Dict0, Pkt); - -%% A message in a locally supported application or a proxiable message -%% in the relay application. Don't distinguish between the two since -%% each application has its own callback config. That is, the user can -%% easily distinguish between the two cases. -recv_R(App, TPid, Caps, Dict0, RecvData, Pkt) -> - request_cb(App, TPid, Caps, Dict0, RecvData, examine(Pkt)). - -%% Note that there may still be errors but these aren't protocol -%% (3xxx) errors that lead to an answer-message. - -request_cb(App, - TPid, - Caps, - Dict0, - #recvdata{service_name = SvcName} - = RecvData, - Pkt) -> + #recvdata{service_name = SvcName}, + Pkt) -> request_cb(cb(App, handle_request, [Pkt, SvcName, {TPid, Caps}]), App, - TPid, - Caps, - Dict0, - RecvData, [], - Pkt). + []). + +rc({N,_}) -> + N; +rc(N) -> + N. -%% examine/1 +%% errors/1 %% -%% Look for errors in a decoded message. It's odd/unfortunate that -%% 501[15] aren't protocol errors. +%% Look for additional errors in a decoded message, prepending the +%% errors field with the first detected error. It's odd/unfortunate +%% that 501[15] aren't protocol errors. With RFC 3588 this means that +%% a handle_request callback has to formulate the answer. With RFC +%% 6733 it's acceptable for 5xxx to be sent in an answer-message. %% DIAMETER_INVALID_MESSAGE_LENGTH 5015 -%% %% This error is returned when a request is received with an invalid %% message length. -examine(#diameter_packet{header = #diameter_header{length = Len}, - bin = Bin, - errors = Es} - = Pkt) +errors(_, #diameter_packet{header = #diameter_header{length = Len}, + bin = Bin, + errors = Es} + = Pkt) when Len < 20; 0 /= Len rem 4; 8*Len /= bit_size(Bin) -> @@ -330,57 +288,75 @@ examine(#diameter_packet{header = #diameter_header{length = Len}, %% This error is returned when a request was received, whose version %% number is unsupported. -examine(#diameter_packet{header = #diameter_header{version = V}, - errors = Es} - = Pkt) +errors(_, #diameter_packet{header = #diameter_header{version = V}, + errors = Es} + = Pkt) when V /= ?DIAMETER_VERSION -> Pkt#diameter_packet{errors = [5011 | Es]}; -examine(Pkt) -> +%% DIAMETER_INVALID_AVP_BITS 3009 +%% A request was received that included an AVP whose flag bits are +%% set to an unrecognized value, or that is inconsistent with the +%% AVP's definition. + +errors(_, #diameter_packet{errors = [Bs | Es]} = Pkt) + when is_bitstring(Bs) -> + Pkt#diameter_packet{errors = [3009 | Es]}; + +%% DIAMETER_COMMAND_UNSUPPORTED 3001 +%% The Request contained a Command-Code that the receiver did not +%% recognize or support. This MUST be used when a Diameter node +%% receives an experimental command that it does not understand. + +errors(Id, #diameter_packet{header = #diameter_header{is_proxiable = P}, + msg = M, + errors = Es} + = Pkt) + when ?APP_ID_RELAY /= Id, undefined == M; %% don't know the command + ?APP_ID_RELAY == Id, not P -> %% command isn't proxiable + Pkt#diameter_packet{errors = [3001 | Es]}; + +%% DIAMETER_INVALID_HDR_BITS 3008 +%% A request was received whose bits in the Diameter header were +%% either set to an invalid combination, or to a value that is +%% inconsistent with the command code's definition. + +errors(_, #diameter_packet{header = #diameter_header{is_request = true, + is_error = true}, + errors = Es} + = Pkt) -> + Pkt#diameter_packet{errors = [3008 | Es]}; + +%% Green. +errors(_, Pkt) -> Pkt. -%% request_cb/8 +%% request_cb/4 %% A reply may be an answer-message, constructed either here or by %% the handle_request callback. The header from the incoming request %% is passed into the encode so that it can retrieve the relevant %% command code in this case. It will also then ignore Dict and use %% the base encoder. -request_cb({reply, Ans}, - #diameter_app{dictionary = Dict}, - TPid, - _Caps, - Dict0, - _RecvData, - Fs, - Pkt) -> - reply(Ans, dict(Dict, Dict0, Ans), TPid, Fs, Pkt); +request_cb({reply, _Ans} = T, _App, EvalPktFs, EvalFs) -> + {T, EvalPktFs, EvalFs}; %% An 3xxx result code, for which the E-bit is set in the header. -request_cb({protocol_error, RC}, - _App, - TPid, - Caps, - Dict0, - _RecvData, - Fs, - Pkt) - when 3000 =< RC, RC < 4000 -> - protocol_error(RC, TPid, Caps, Dict0, Fs, Pkt); +request_cb({protocol_error, RC}, _App, EvalPktFs, EvalFs) + when 3 == RC div 1000 -> + {{answer_message, RC}, EvalPktFs, EvalFs}; + +request_cb({answer_message, RC} = T, _App, EvalPktFs, EvalFs) + when 3 == RC div 1000; + 5 == RC div 1000 -> + {T, EvalPktFs, EvalFs}; %% RFC 3588 says we must reply 3001 to anything unrecognized or %% unsupported. 'noreply' is undocumented (and inappropriately named) %% backwards compatibility for this, protocol_error the documented %% alternative. -request_cb(noreply, - _App, - TPid, - Caps, - Dict0, - _RecvData, - Fs, - Pkt) -> - protocol_error(3001, TPid, Caps, Dict0, Fs, Pkt); +request_cb(noreply, _App, EvalPktFs, EvalFs) -> + {{answer_message, 3001}, EvalPktFs, EvalFs}; %% Relay a request to another peer. This is equivalent to doing an %% explicit call/4 with the message in question except that (1) a loop @@ -397,29 +373,77 @@ request_cb(noreply, %% want to distinguish between the cases in the callback return value %% then 'resend' is a neutral alternative. %% -request_cb({A, Opts}, - #diameter_app{id = Id} - = App, - TPid, - Caps, - Dict0, - RecvData, - Fs, - Pkt) +request_cb({A, Opts}, #diameter_app{id = Id}, EvalPktFs, EvalFs) when A == relay, Id == ?APP_ID_RELAY; A == proxy, Id /= ?APP_ID_RELAY; A == resend -> - resend(Opts, App, TPid, Caps, Dict0, RecvData, Fs, Pkt); + {{call, Opts}, EvalPktFs, EvalFs}; -request_cb(discard, _, _, _, _, _, _, _) -> - ok; +request_cb(discard = No, _, _, _) -> + No; + +request_cb({eval_packet, RC, F}, App, Fs, EvalFs) -> + request_cb(RC, App, [F|Fs], EvalFs); + +request_cb({eval, RC, F}, App, EvalPktFs, Fs) -> + request_cb(RC, App, EvalPktFs, [F|Fs]); + +request_cb(T, App, _, _) -> + ?ERROR({invalid_return, T, handle_request, App}). + +%% send_A/4 -request_cb({eval_packet, RC, F}, App, TPid, Caps, Dict0, RecvData, Fs, Pkt) -> - request_cb(RC, App, TPid, Caps, Dict0, RecvData, [F|Fs], Pkt); +send_A({Caps, Pkt}, TPid, Dict0, _RecvData) -> %% unsupported application + #diameter_packet{errors = [RC|_]} = Pkt, + send_A(answer_message(RC, Caps, Dict0, Pkt), + TPid, + Dict0, + Pkt, + [], + []); + +send_A({Caps, Pkt, App, {T, EvalPktFs, EvalFs}}, TPid, Dict0, RecvData) -> + send_A(answer(T, Caps, Pkt, App, Dict0, RecvData), + TPid, + Dict0, + Pkt, + EvalPktFs, + EvalFs); + +send_A(_, _, _, _) -> + ok. + +%% send_A/6 + +send_A(T, TPid, Dict0, ReqPkt, EvalPktFs, EvalFs) -> + reply(T, TPid, Dict0, EvalPktFs, ReqPkt), + lists:foreach(fun diameter_lib:eval/1, EvalFs). + +%% answer/6 + +answer({reply, Ans}, _Caps, _Pkt, App, Dict0, _RecvData) -> + {dict(App#diameter_app.dictionary, Dict0, Ans), Ans}; + +answer({call, Opts}, Caps, Pkt, App, Dict0, RecvData) -> + #diameter_caps{origin_host = {OH,_}} + = Caps, + #diameter_packet{avps = Avps} + = Pkt, + {Code, _Flags, Vid} = Dict0:avp_header('Route-Record'), + resend(is_loop(Code, Vid, OH, Dict0, Avps), + Opts, + Caps, + Pkt, + App, + Dict0, + RecvData); -request_cb({eval, RC, F}, App, TPid, Caps, Dict0, RecvData, Fs, Pkt) -> - request_cb(RC, App, TPid, Caps, Dict0, RecvData, Fs, Pkt), - diameter_lib:eval(F). +%% RFC 3588 only allows 3xxx errors in an answer-message. RFC 6733 +%% added the possibility of setting 5xxx. +answer({answer_message, RC} = T, Caps, Pkt, App, Dict0, _RecvData) -> + Dict0 /= ?BASE orelse 3 == RC div 1000 + orelse ?ERROR({invalid_return, T, handle_request, App}), + answer_message(RC, Caps, Dict0, Pkt). %% dict/3 @@ -436,65 +460,31 @@ dict(Dict, Dict0, [Msg]) -> dict(Dict, Dict0, #diameter_packet{msg = Msg}) -> dict(Dict, Dict0, Msg); -dict(_Dict, Dict0, ['answer-message' | _]) -> - Dict0; +dict(Dict, Dict0, Msg) -> + choose(is_answer_message(Msg, Dict0), Dict0, Dict). -dict(Dict, Dict0, Rec) -> +is_answer_message([Name | _], _) -> + Name == 'answer-message'; + +is_answer_message(Rec, Dict) -> try - 'answer-message' = Dict0:rec2msg(element(1,Rec)), - Dict0 + 'answer-message' == Dict:rec2msg(element(1,Rec)) catch - error:_ -> Dict + error:_ -> false end. -%% protocol_error/6 - -protocol_error(RC, TPid, Caps, Dict0, Fs, Pkt) -> - #diameter_caps{origin_host = {OH,_}, - origin_realm = {OR,_}} - = Caps, - #diameter_packet{avps = Avps, errors = Es} - = Pkt, +%% answer_message/4 +answer_message(RC, + #diameter_caps{origin_host = {OH,_}, + origin_realm = {OR,_}}, + Dict0, + #diameter_packet{avps = Avps} + = Pkt) -> ?LOG({error, RC}, Pkt), - reply(answer_message({OH, OR, RC}, Dict0, Avps), - Dict0, - TPid, - Fs, - Pkt#diameter_packet{errors = [RC | Es]}). -%% Note that reply/5 may set the result code once more. It's set in -%% answer_message/3 in case reply/5 doesn't. - -%% protocol_error/5 - -protocol_error(RC, TPid, Caps, Dict0, Pkt) -> - protocol_error(RC, TPid, Caps, Dict0, [], Pkt). + {Dict0, answer_message(OH, OR, RC, Dict0, Avps)}. %% resend/7 -%% -%% Resend a message as a relay or proxy agent. - -resend(Opts, - #diameter_app{} - = App, - TPid, - #diameter_caps{origin_host = {OH,_}} - = Caps, - Dict0, - RecvData, - Fs, - #diameter_packet{avps = Avps} - = Pkt) -> - {Code, _Flags, Vid} = Dict0:avp_header('Route-Record'), - resend(is_loop(Code, Vid, OH, Dict0, Avps), - Opts, - App, - TPid, - Caps, - Dict0, - RecvData, - Fs, - Pkt). %% DIAMETER_LOOP_DETECTED 3005 %% An agent detected a loop while trying to get the message to the @@ -502,8 +492,8 @@ resend(Opts, %% if one is available, but the peer reporting the error has %% identified a configuration problem. -resend(true, _Opts, _App, TPid, Caps, Dict0, _RecvData, Fs, Pkt) -> - protocol_error(3005, TPid, Caps, Dict0, Fs, Pkt); +resend(true, _Opts, Caps, Pkt, _App, Dict0, _RecvData) -> + answer_message(3005, Caps, Dict0, Pkt); %% 6.1.8. Relaying and Proxying Requests %% @@ -513,22 +503,20 @@ resend(true, _Opts, _App, TPid, Caps, Dict0, _RecvData, Fs, Pkt) -> resend(false, Opts, - App, - TPid, #diameter_caps{origin_host = {_,OH}} = Caps, - Dict0, - #recvdata{service_name = SvcName, - sequence = Mask}, - Fs, #diameter_packet{header = Hdr0, avps = Avps} - = Pkt) -> + = Pkt, + App, + Dict0, + #recvdata{service_name = SvcName, + sequence = Mask}) -> Route = #diameter_avp{data = {Dict0, 'Route-Record', OH}}, Seq = diameter_session:sequence(Mask), Hdr = Hdr0#diameter_header{hop_by_hop_id = Seq}, Msg = [Hdr, Route | Avps], - resend(send_request(SvcName, App, Msg, Opts), TPid, Caps, Dict0, Fs, Pkt). + resend(send_request(SvcName, App, Msg, Opts), Caps, Dict0, Pkt). %% The incoming request is relayed with the addition of a %% Route-Record. Note the requirement on the return from call/4 below, %% which places a requirement on the value returned by the @@ -545,28 +533,24 @@ resend(false, %% RFC 6.3 says that a relay agent does not modify Origin-Host but %% says nothing about a proxy. Assume it should behave the same way. -%% resend/6 +%% resend/4 %% %% Relay a reply to a relayed request. %% Answer from the peer: reset the hop by hop identifier and send. resend(#diameter_packet{bin = B} = Pkt, - TPid, _Caps, _Dict0, - Fs, #diameter_packet{header = #diameter_header{hop_by_hop_id = Id}, transport_data = TD}) -> - P = Pkt#diameter_packet{bin = diameter_codec:hop_by_hop_id(Id, B), - transport_data = TD}, - eval_packet(P, Fs), - send(TPid, P); + Pkt#diameter_packet{bin = diameter_codec:hop_by_hop_id(Id, B), + transport_data = TD}; %% TODO: counters %% Or not: DIAMETER_UNABLE_TO_DELIVER. -resend(_, TPid, Caps, Dict0, Fs, Pkt) -> - protocol_error(3002, TPid, Caps, Dict0, Fs, Pkt). +resend(_, Caps, Dict0, Pkt) -> + answer_message(3002, Caps, Dict0, Pkt). %% is_loop/5 %% @@ -590,37 +574,110 @@ is_loop(Code, Vid, OH, Dict0, Avps) -> is_loop(Code, Vid, Dict0:avp(encode, OH, 'Route-Record'), Dict0, Avps). %% reply/5 + +%% Local answer ... +reply({Dict, Ans}, TPid, Dict0, Fs, ReqPkt) -> + reply(Ans, Dict, TPid, Dict0, Fs, ReqPkt); + +%% ... or relayed. +reply(#diameter_packet{} = Pkt, TPid, _Dict0, Fs, _ReqPkt) -> + eval_packet(Pkt, Fs), + send(TPid, Pkt). + +%% reply/6 %% %% Send a locally originating reply. %% Skip the setting of Result-Code and Failed-AVP's below. This is -%% currently undocumented. -reply([Msg], Dict, TPid, Fs, Pkt) +%% undocumented and shouldn't be relied on. +reply([Msg], Dict, TPid, Dict0, Fs, ReqPkt) when is_list(Msg); is_tuple(Msg) -> - reply(Msg, Dict, TPid, Fs, Pkt#diameter_packet{errors = []}); + reply(Msg, Dict, TPid, Dict0, Fs, ReqPkt#diameter_packet{errors = []}); %% No errors or a diameter_header/avp list. -reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = Es} = ReqPkt) - when [] == Es; - is_record(hd(Msg), diameter_header) -> - Pkt = encode(Dict, make_answer_packet(Msg, ReqPkt), Fs), - incr(send, Pkt, Dict, TPid), %% count result codes in sent answers - send(TPid, Pkt); - -%% Or not: set Result-Code and Failed-AVP AVP's. -reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = [H|_] = Es} = Pkt) -> - reply(rc(Msg, rc(H), [A || {_,A} <- Es], Dict), +reply(Msg, Dict, TPid, Dict0, Fs, ReqPkt) -> + Pkt = encode(Dict, reset(make_answer_packet(Msg, ReqPkt), Dict), Fs), + incr(send, Pkt, Dict, TPid, Dict0), %% count outgoing result codes + send(TPid, Pkt). + +%% reset/2 + +%% Header/avps list: send as is. +reset(#diameter_packet{msg = [#diameter_header{} | _]} = Pkt, _) -> + Pkt; + +%% No errors to set or errors explicitly ignored. +reset(#diameter_packet{errors = Es} = Pkt, _) + when Es == []; + Es == false -> + Pkt; + +%% Otherwise possibly set Result-Code and/or Failed-AVP. +reset(#diameter_packet{msg = Msg, errors = Es} = Pkt, Dict) -> + Pkt#diameter_packet{msg = reset(Msg, Dict, Es)}. + +%% reset/3 + +reset(Msg, Dict, Es) + when is_list(Es) -> + {E3, E5, Fs} = partition(Es), + FailedAVP = failed_avp(Msg, lists:reverse(Fs), Dict), + reset(set(Msg, FailedAVP, Dict), Dict, - TPid, - Fs, - Pkt#diameter_packet{errors = []}). + choose(is_answer_message(Msg, Dict), E3, E5)); + +reset(Msg, Dict, N) + when is_integer(N) -> + ResultCode = rc(Msg, {'Result-Code', N}, Dict), + set(Msg, ResultCode, Dict); + +reset(Msg, _, _) -> + Msg. + +partition(Es) -> + lists:foldl(fun pacc/2, {false, false, []}, Es). + +%% Note that the errors list can contain not only integer() and +%% {integer(), #diameter_avp{}} but also #diameter_avp{}. The latter +%% isn't something that's returned by decode but can be set in a reply +%% for encode. + +pacc({RC, #diameter_avp{} = A}, {E3, E5, Acc}) + when is_integer(RC) -> + pacc(RC, {E3, E5, [A|Acc]}); + +pacc(#diameter_avp{} = A, {E3, E5, Acc}) -> + {E3, E5, [A|Acc]}; + +pacc(RC, {false, E5, Acc}) + when 3 == RC div 1000 -> + {RC, E5, Acc}; + +pacc(RC, {E3, false, Acc}) + when 5 == RC div 1000 -> + {E3, RC, Acc}; + +pacc(_, Acc) -> + Acc. eval_packet(Pkt, Fs) -> lists:foreach(fun(F) -> diameter_lib:eval([F,Pkt]) end, Fs). %% make_answer_packet/2 +%% Use decode errors to set Result-Code and/or Failed-AVP unless the +%% the errors field has been explicitly set. Unfortunately, the +%% default value is the empty list rather than 'undefined' so use the +%% atom 'false' for "set nothing". (This is historical and changing +%% the default value would require modules including diameter.hrl to +%% be recompiled.) +make_answer_packet(#diameter_packet{errors = []} + = Pkt, + #diameter_packet{errors = [_|_] = Es} + = ReqPkt) -> + make_answer_packet(Pkt#diameter_packet{errors = Es}, ReqPkt); + %% A reply message clears the R and T flags and retains the P flag. %% The E flag will be set at encode. 6.2 of 3588 requires the same P %% flag on an answer as on the request. A #diameter_packet{} returned @@ -628,6 +685,7 @@ eval_packet(Pkt, Fs) -> %% own header values. make_answer_packet(#diameter_packet{header = Hdr, msg = Msg, + errors = Es, transport_data = TD}, #diameter_packet{header = ReqHdr}) -> Hdr0 = ReqHdr#diameter_header{version = ?DIAMETER_VERSION, @@ -636,6 +694,7 @@ make_answer_packet(#diameter_packet{header = Hdr, is_retransmitted = false}, #diameter_packet{header = fold_record(Hdr0, Hdr), msg = Msg, + errors = Es, transport_data = TD}; %% Binaries and header/avp lists are sent as-is. @@ -652,25 +711,6 @@ make_answer_packet([#diameter_header{} | _] = Msg, make_answer_packet(Msg, #diameter_packet{transport_data = TD} = Pkt) -> make_answer_packet(#diameter_packet{msg = Msg, transport_data = TD}, Pkt). -%% rc/1 - -rc({RC, _}) -> - RC; -rc(RC) -> - RC. - -%% rc/4 - -rc(#diameter_packet{msg = Rec} = Pkt, RC, Failed, DictT) -> - Pkt#diameter_packet{msg = rc(Rec, RC, Failed, DictT)}; - -rc(Rec, RC, Failed, DictT) - when is_integer(RC) -> - set(Rec, - lists:append([rc(Rec, {'Result-Code', RC}, DictT), - failed_avp(Rec, Failed, DictT)]), - DictT). - %% Reply as name and tuple list ... set([_|_] = Ans, Avps, _) -> Ans ++ Avps; %% Values nearer tail take precedence. @@ -796,9 +836,9 @@ fa(Rec, FailedAvp, Dict) -> %% Error-Message AVP is not intended to be useful in real-time, and %% SHOULD NOT be expected to be parsed by network entities. -%% answer_message/3 +%% answer_message/5 -answer_message({OH, OR, RC}, Dict0, Avps) -> +answer_message(OH, OR, RC, Dict0, Avps) -> {Code, _, Vid} = Dict0:avp_header('Session-Id'), ['answer-message', {'Origin-Host', OH}, {'Origin-Realm', OR}, @@ -892,32 +932,48 @@ find(Pred, [H|T]) -> %% incr/4 %% -%% Increment a stats counter for an incoming or outgoing message. +%% Increment a stats counter for result codes in incoming and outgoing +%% answers. %% Outgoing message as binary: don't count. (Sending binaries is only %% partially supported.) -incr(_, #diameter_packet{msg = undefined}, _, _) -> +incr(_, #diameter_packet{msg = undefined}, _, _, _) -> ok; -incr(recv = D, #diameter_packet{header = H, errors = [_|_]}, _, TPid) -> +%% Incoming with decode errors. +incr(recv = D, #diameter_packet{header = H, errors = [_|_]}, _, TPid, _) -> incr(TPid, {diameter_codec:msg_id(H), D, error}); -incr(Dir, Pkt, Dict, TPid) -> +%% Incoming without errors or outgoing. Outgoing with encode errors +%% never gets here since encode fails. +incr(Dir, Pkt, Dict, TPid, Dict0) -> #diameter_packet{header = #diameter_header{is_error = E} = Hdr, msg = Rec} = Pkt, RC = int(get_avp_value(Dict, 'Result-Code', Rec)), - PE = is_protocol_error(RC), - %% Check that the E bit is set only for 3xxx result codes. - (not (E orelse PE)) - orelse (E andalso PE) + %% Exit on an improper Result-Code. + is_result(RC, E, Dict0) orelse x({invalid_error_bit, RC}, answer, [Dir, Pkt]), irc(TPid, Hdr, Dir, rc_counter(Dict, Rec, RC)). +%% No E-bit: can't be 3xxx. +is_result(RC, false, _Dict0) -> + RC < 3000 orelse 4000 =< RC; + +%% E-bit in RFC 3588: only 3xxx. +is_result(RC, true, ?BASE) -> + 3000 =< RC andalso RC < 4000; + +%% E-bit in RFC 6733: 3xxx or 5xxx. +is_result(RC, true, _) -> + 3000 =< RC andalso RC < 4000 + orelse + 5000 =< RC andalso RC < 6000. + irc(_, _, _, undefined) -> false; @@ -929,7 +985,7 @@ irc(TPid, Hdr, Dir, Ctr) -> incr(TPid, Counter) -> diameter_stats:incr(Counter, TPid, 1). -%% error_counter/2 +%% rc_counter/2 %% RFC 3588, 7.6: %% @@ -969,9 +1025,6 @@ int(N) int(_) -> undefined. -is_protocol_error(RC) -> - 3000 =< RC andalso RC < 4000. - -spec x(any(), atom(), list()) -> no_return(). %% Warn and exit request process on errors in an incoming answer. @@ -1121,7 +1174,7 @@ send_R({eval_packet, RC, F}, Pkt, T, Opts, Caller, SvcName, Fs) -> send_R(RC, Pkt, T, Opts, Caller, SvcName, [F|Fs]); send_R(E, _, {_, _, App}, _, _, _, _) -> - ?ERROR({invalid_return, prepare_request, App, E}). + ?ERROR({invalid_return, E, prepare_request, App}). %% make_prepare_packet/2 %% @@ -1268,28 +1321,33 @@ handle_answer(SvcName, App, {error, Req, Reason}) -> handle_error(App, Req, Reason, SvcName); handle_answer(SvcName, - #diameter_app{dictionary = Dict} + #diameter_app{dictionary = Dict, + id = Id} = App, {answer, Req, Dict0, Pkt}) -> Mod = dict(Dict, Dict0, Pkt), - answer(examine(diameter_codec:decode(Mod, Pkt)), - SvcName, - Mod, - App, - Req). + handle_A(errors(Id, diameter_codec:decode(Mod, Pkt)), + SvcName, + Mod, + Dict0, + App, + Req). %% We don't really need to do a full decode if we're a relay and will %% just resend with a new hop by hop identifier, but might a proxy %% want to examine the answer? -answer(Pkt, SvcName, Dict, App, #request{transport = TPid} = Req) -> +handle_A(Pkt, SvcName, Dict, Dict0, App, #request{transport = TPid} = Req) -> try - incr(recv, Pkt, Dict, TPid) + incr(recv, Pkt, Dict, TPid, Dict0) %% count incoming result codes of _ -> answer(Pkt, SvcName, App, Req) catch - exit: {invalid_error_bit, _} = E -> - answer(Pkt#diameter_packet{errors = [E]}, SvcName, App, Req) + exit: {invalid_error_bit, RC} -> + #diameter_packet{errors = Es} + = Pkt, + E = {5004, #diameter_avp{name = 'Result-Code', value = RC}}, + answer(Pkt#diameter_packet{errors = [E|Es]}, SvcName, App, Req) end. answer(Pkt, @@ -1479,7 +1537,7 @@ retransmit({eval_packet, RC, F}, Transport, Req, SvcName, Timeout, Fs) -> retransmit(RC, Transport, Req, SvcName, Timeout, [F|Fs]); retransmit(T, {_, _, App}, _, _, _, _) -> - ?ERROR({invalid_return, prepare_retransmit, App, T}). + ?ERROR({invalid_return, T, prepare_retransmit, App}). resend_request(Pkt0, {TPid, Caps, #diameter_app{dictionary = Dict}}, |