diff options
Diffstat (limited to 'lib/diameter/src/base/diameter_peer_fsm.erl')
| -rw-r--r-- | lib/diameter/src/base/diameter_peer_fsm.erl | 187 |
1 files changed, 144 insertions, 43 deletions
diff --git a/lib/diameter/src/base/diameter_peer_fsm.erl b/lib/diameter/src/base/diameter_peer_fsm.erl index 3f4945f7a6..ecdb09d34a 100644 --- a/lib/diameter/src/base/diameter_peer_fsm.erl +++ b/lib/diameter/src/base/diameter_peer_fsm.erl @@ -48,15 +48,19 @@ -include("diameter_internal.hrl"). -include("diameter_gen_base_rfc3588.hrl"). +%% Values of Disconnect-Cause in DPR. -define(GOAWAY, ?'DIAMETER_BASE_DISCONNECT-CAUSE_DO_NOT_WANT_TO_TALK_TO_YOU'). -define(REBOOT, ?'DIAMETER_BASE_DISCONNECT-CAUSE_REBOOTING'). +-define(BUSY, ?'DIAMETER_BASE_DISCONNECT-CAUSE_BUSY'). -define(NO_INBAND_SECURITY, 0). -define(TLS, 1). %% Keys in process dictionary. -define(CB_KEY, cb). %% capabilities callback +-define(DPR_KEY, dpr). %% disconnect callback -define(DWA_KEY, dwa). %% outgoing DWA +-define(REF_KEY, ref). %% transport_ref() -define(Q_KEY, q). %% transport start queue -define(START_KEY, start). %% start of connected transport -define(SEQUENCE_KEY, mask). %% mask for sequence numbers @@ -68,6 +72,13 @@ %% A 2xxx series Result-Code. Not necessarily 2001. -define(IS_SUCCESS(N), 2 == (N) div 1000). +%% Guards. +-define(IS_UINT32(N), (0 =< N andalso 0 == N bsr 32)). +-define(IS_TIMEOUT(N), ?IS_UINT32(N)). +-define(IS_CAUSE(N), N == ?REBOOT; N == rebooting; + N == ?GOAWAY; N == goaway; + N == ?BUSY; N == busy). + %% RFC 3588: %% %% Timeout An application-defined timer has expired while waiting @@ -75,18 +86,16 @@ %% -define(EVENT_TIMEOUT, 10000). -%% How long to wait for a DPA in response to DPR before simply -%% aborting. Used to distinguish between shutdown and not but there's -%% not really any need. Stopping a service will require a timeout if -%% the peer doesn't answer DPR so the value should be short-ish. +%% Default timeout for DPA in response to DPR. A bit short but the +%% timeout used to be hardcoded. (So it could be worse.) -define(DPA_TIMEOUT, 1000). -record(state, {state = 'Wait-Conn-Ack' %% state of RFC 3588 Peer State Machine :: 'Wait-Conn-Ack' | recv_CER | 'Wait-CEA' | 'Open', mode :: accept | connect | {connect, reference()}, - parent :: pid(), - transport :: pid(), + parent :: pid(), %% watchdog process + transport :: pid(), %% transport process service :: #diameter_service{}, dpr = false :: false | {diameter:'Unsigned32'(), diameter:'Unsigned32'()}}). @@ -163,14 +172,16 @@ i({WPid, Type, Opts, #diameter_service{} = Svc}) -> %% from old code i({WPid, Type, Opts, {?NOMASK, [node() | nodes()], Svc}}); i({WPid, T, Opts, {Mask, Nodes, #diameter_service{applications = Apps, - capabilities = Caps} + capabilities = LCaps} = Svc}}) -> [] /= Apps orelse ?ERROR({no_apps, T, Opts}), - putr(?DWA_KEY, dwa(Caps)), + putr(?DWA_KEY, dwa(LCaps)), {M, Ref} = T, diameter_stats:reg(Ref), - {[Ts], Rest} = proplists:split(Opts, [capabilities_cb]), - putr(?CB_KEY, {Ref, [F || {_,F} <- Ts]}), + {[Cs,Ds], Rest} = proplists:split(Opts, [capabilities_cb, disconnect_cb]), + putr(?CB_KEY, {Ref, [F || {_,F} <- Cs]}), + putr(?DPR_KEY, [F || {_, F} <- Ds]), + putr(?REF_KEY, Ref), putr(?SEQUENCE_KEY, Mask), putr(?RESTRICT_KEY, Nodes), erlang:monitor(process, WPid), @@ -188,8 +199,8 @@ i({WPid, T, Opts, {Mask, Nodes, #diameter_service{applications = Apps, %% watchdog start (start/2) succeeds regardless so as not to crash the %% service. -start_transport(T, Opts, #diameter_service{capabilities = Caps} = Svc) -> - Addrs0 = Caps#diameter_caps.host_ip_address, +start_transport(T, Opts, #diameter_service{capabilities = LCaps} = Svc) -> + Addrs0 = LCaps#diameter_caps.host_ip_address, start_transport(Addrs0, {T, Opts, Svc}). start_transport(Addrs0, T) -> @@ -212,9 +223,9 @@ svc(Svc, []) -> svc(Svc, Addrs) -> readdr(Svc, Addrs). -readdr(#diameter_service{capabilities = Caps0} = Svc, Addrs) -> - Caps = Caps0#diameter_caps{host_ip_address = Addrs}, - Svc#diameter_service{capabilities = Caps}. +readdr(#diameter_service{capabilities = LCaps0} = Svc, Addrs) -> + LCaps = LCaps0#diameter_caps{host_ip_address = Addrs}, + Svc#diameter_service{capabilities = LCaps}. %% The 4-tuple Data returned from diameter_peer:start/1 identifies the %% transport module/config use to start the transport process in @@ -375,17 +386,17 @@ transition({send, Msg}, #state{transport = TPid}) -> send(TPid, Msg), ok; -%% Request for graceful shutdown. -transition({shutdown, Pid}, #state{parent = Pid, dpr = false} = S) -> - dpr(?GOAWAY, S); -transition({shutdown, Pid}, #state{parent = Pid}) -> - ok; - -%% Application shutdown. -transition(shutdown, #state{dpr = false} = S) -> - dpr(?REBOOT, S); -transition(shutdown, _) -> %% DPR already send: ensure expected timeout - dpa_timer(), +%% Messages from old (diameter_service) code. +transition(shutdown = T, #state{parent = Pid} = S) -> + transition({T, Pid, service}, S); %% Reason irrelevant: old code has no cb + +%% Request for graceful shutdown at remove_transport, stop_service of +%% application shutdown. +transition({shutdown = T, Pid}, S) -> + transition({T, Pid, transport}, S); +transition({shutdown, Pid, Reason}, #state{parent = Pid, dpr = false} = S) -> + dpr(Reason, S); +transition({shutdown, Pid, _}, #state{parent = Pid}) -> ok; %% Request to close the transport connection. @@ -441,13 +452,13 @@ start_next(#state{service = Svc0} = S) -> %% send_CER/1 send_CER(#state{mode = {connect, Remote}, - service = #diameter_service{capabilities = Caps}, + service = #diameter_service{capabilities = LCaps}, transport = TPid} = S) -> - OH = Caps#diameter_caps.origin_host, + OH = LCaps#diameter_caps.origin_host, req_send_CER(OH, Remote) orelse - close({already_connected, Remote, Caps}, S), + close({already_connected, Remote, LCaps}, S), CER = build_CER(S), ?LOG(send, 'CER'), send(TPid, encode(CER)), @@ -471,8 +482,8 @@ start_timer(#state{state = PS} = S) -> %% build_CER/1 -build_CER(#state{service = #diameter_service{capabilities = Caps}}) -> - {ok, CER} = diameter_capx:build_CER(Caps), +build_CER(#state{service = #diameter_service{capabilities = LCaps}}) -> + {ok, CER} = diameter_capx:build_CER(LCaps), CER. %% encode/1 @@ -800,8 +811,8 @@ a('CER', #diameter_caps{vendor_id = Vid, {'Product-Name', Name}, {'Origin-State-Id', OSI}]; -a('DPR', #diameter_caps{origin_host = Host, - origin_realm = Realm}) -> +a('DPR', #diameter_caps{origin_host = {Host, _}, + origin_realm = {Realm, _}}) -> ['DPA', {'Origin-Host', Host}, {'Origin-Realm', Realm}]. @@ -909,7 +920,9 @@ rejected(N) %% open/5 -open(Pkt, SupportedApps, Caps, {Type, IS}, #state{parent = Pid} = S) -> +open(Pkt, SupportedApps, Caps, {Type, IS}, #state{parent = Pid, + service = Svc} + = S) -> #diameter_caps{origin_host = {_,_} = H, inband_security_id = {LS,_}} = Caps, @@ -917,7 +930,9 @@ open(Pkt, SupportedApps, Caps, {Type, IS}, #state{parent = Pid} = S) -> tls_ack(lists:member(?TLS, LS), Caps, Type, IS, S), Pid ! {open, self(), H, {Caps, SupportedApps, Pkt}}, - S#state{state = 'Open'}. + %% Replace capabilities record with local/remote pairs. + S#state{state = 'Open', + service = Svc#diameter_service{capabilities = Caps}}. %% We've advertised TLS support: tell the transport the result %% and expect a reply when the handshake is complete. @@ -970,24 +985,110 @@ dwa(#diameter_caps{origin_host = OH, {'Origin-State-Id', OSI}]. %% dpr/2 +%% +%% The RFC isn't clear on whether DPR should be send in a non-Open +%% state. The Peer State Machine transitions it documents aren't +%% exhaustive (no Stop in Wait-I-CEA for example) so assume it's up to +%% the implementation and transition to Closed (ie. die) if we haven't +%% yet reached Open. + +%% Connection is open, DPR has not been sent. +dpr(Reason, #state{state = 'Open', + dpr = false, + service = #diameter_service{capabilities = Caps}} + = S) -> + case getr(?DPR_KEY) of + CBs when is_list(CBs) -> + Ref = getr(?REF_KEY), + Peer = {self(), Caps}, + dpr(CBs, [Reason, Ref, Peer], S); + undefined -> %% started in old code + send_dpr(Reason, [], S) + end; -dpr(Cause, #state{transport = TPid, - service = #diameter_service{capabilities = Caps}} - = S) -> - #diameter_caps{origin_host = OH, - origin_realm = OR} +%% Connection is open, DPR already sent. +dpr(_, #state{state = 'Open'}) -> + ok; + +%% Connection not open. +dpr(_Reason, _S) -> + stop. + +%% dpr/3 +%% +%% Note that an implementation that wants to do something +%% transport_module-specific can lookup the pid of the transport +%% process and contact it. (eg. diameter:service_info/2) + +dpr([CB|Rest], [Reason | _] = Args, S) -> + try diameter_lib:eval([CB | Args]) of + {dpr, Opts} when is_list(Opts) -> + send_dpr(Reason, Opts, S); + dpr -> + send_dpr(Reason, [], S); + close = T -> + {stop, {disconnect_cb, T}}; + ignore -> + dpr(Rest, Args, S); + T -> + No = {disconnect_cb, T}, + diameter_lib:error_report(invalid, No), + {stop, No} + catch + E:R -> + No = {disconnect_cb, E, R, ?STACK}, + diameter_lib:error_report(failure, No), + {stop, No} + end; + +dpr([], [Reason | _], S) -> + send_dpr(Reason, [], S). + +-record(opts, {cause, timeout = ?DPA_TIMEOUT}). + +send_dpr(Reason, Opts, #state{transport = TPid, + service = #diameter_service{capabilities = Caps}} + = S) -> + #opts{cause = Cause, timeout = Tmo} + = lists:foldl(fun opt/2, + #opts{cause = case Reason of + transport -> ?GOAWAY; + _ -> ?REBOOT + end, + timeout = ?DPA_TIMEOUT}, + Opts), + #diameter_caps{origin_host = {OH, _}, + origin_realm = {OR, _}} = Caps, Bin = encode(['DPR', {'Origin-Host', OH}, {'Origin-Realm', OR}, {'Disconnect-Cause', Cause}]), send(TPid, Bin), - dpa_timer(), + dpa_timer(Tmo), ?LOG(send, 'DPR'), S#state{dpr = diameter_codec:sequence_numbers(Bin)}. -dpa_timer() -> - erlang:send_after(?DPA_TIMEOUT, self(), dpa_timeout). +opt({timeout, Tmo}, Rec) + when ?IS_TIMEOUT(Tmo) -> + Rec#opts{timeout = Tmo}; +opt({cause, Cause}, Rec) + when ?IS_CAUSE(Cause) -> + Rec#opts{cause = cause(Cause)}; +opt(T, _) -> + ?ERROR({invalid_option, T}). + +cause(rebooting) -> ?REBOOT; +cause(goaway) -> ?GOAWAY; +cause(busy) -> ?BUSY; +cause(N) + when ?IS_CAUSE(N) -> + N; +cause(N) -> + ?ERROR({invalid_cause, N}). + +dpa_timer(Tmo) -> + erlang:send_after(Tmo, self(), dpa_timeout). %% register_everywhere/1 %% |