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authorIngela Anderton Andin <[email protected]>2019-05-08 11:35:55 +0200
committerIngela Anderton Andin <[email protected]>2019-05-08 12:01:55 +0200
commit736433621d9694871a7c98edd6878ed1cc235572 (patch)
tree4a059b4a35d3004e8e179f1a9ff38319d54513e9
parent5110947bcdc18036d4dc7ac666489ed936964ee4 (diff)
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ssl: Internal active n must back off when user does not read data
TLS connections should not buffer too much application data if they want to benefit from TCP flow control. Certain applications may want to customize the value of internal_active_n as there is a tradeoff between buffering memory and throughput.
-rw-r--r--lib/ssl/src/tls_connection.erl90
1 files changed, 55 insertions, 35 deletions
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl
index b848f82575..b88c7292a7 100644
--- a/lib/ssl/src/tls_connection.erl
+++ b/lib/ssl/src/tls_connection.erl
@@ -142,32 +142,60 @@ pids(#state{protocol_specific = #{sender := Sender}}) ->
%%====================================================================
%% State transition handling
%%====================================================================
-next_record(#state{handshake_env =
+next_record(_, #state{handshake_env =
#handshake_env{unprocessed_handshake_events = N} = HsEnv}
= State) when N > 0 ->
{no_record, State#state{handshake_env =
HsEnv#handshake_env{unprocessed_handshake_events = N-1}}};
-next_record(#state{protocol_buffers =
- #protocol_buffers{tls_cipher_texts = [_|_] = CipherTexts},
- connection_states = ConnectionStates,
- ssl_options = #ssl_options{padding_check = Check}} = State) ->
+next_record(_, #state{protocol_buffers =
+ #protocol_buffers{tls_cipher_texts = [_|_] = CipherTexts},
+ connection_states = ConnectionStates,
+ ssl_options = #ssl_options{padding_check = Check}} = State) ->
next_record(State, CipherTexts, ConnectionStates, Check);
-next_record(#state{protocol_buffers = #protocol_buffers{tls_cipher_texts = []},
- protocol_specific = #{active_n_toggle := true, active_n := N} = ProtocolSpec,
- static_env = #static_env{socket = Socket,
- close_tag = CloseTag,
- transport_cb = Transport}
- } = State) ->
- case tls_socket:setopts(Transport, Socket, [{active, N}]) of
- ok ->
- {no_record, State#state{protocol_specific = ProtocolSpec#{active_n_toggle => false}}};
- _ ->
- self() ! {CloseTag, Socket},
- {no_record, State}
- end;
-next_record(State) ->
+next_record(connection, #state{protocol_buffers = #protocol_buffers{tls_cipher_texts = []},
+ protocol_specific = #{active_n_toggle := true}
+ } = State) ->
+ %% If ssl application user is not reading data wait to activate socket
+ flow_ctrl(State);
+
+next_record(_, #state{protocol_buffers = #protocol_buffers{tls_cipher_texts = []},
+ protocol_specific = #{active_n_toggle := true}
+ } = State) ->
+ activate_socket(State);
+next_record(_, State) ->
{no_record, State}.
+
+flow_ctrl(#state{user_data_buffer = {_,Size,_},
+ socket_options = #socket_options{active = false},
+ bytes_to_read = undefined} = State) when Size =/= 0 ->
+ {no_record, State};
+flow_ctrl(#state{user_data_buffer = {_,Size,_},
+ socket_options = #socket_options{active = false},
+ bytes_to_read = 0} = State) when Size =/= 0 ->
+ {no_record, State};
+flow_ctrl(#state{user_data_buffer = {_,Size,_},
+ socket_options = #socket_options{active = false},
+ bytes_to_read = BytesToRead} = State) when (Size >= BytesToRead) andalso
+ (BytesToRead > 0) ->
+ {no_record, State};
+flow_ctrl(State) ->
+ activate_socket(State).
+
+
+activate_socket(#state{protocol_specific = #{active_n_toggle := true, active_n := N} = ProtocolSpec,
+ static_env = #static_env{socket = Socket,
+ close_tag = CloseTag,
+ transport_cb = Transport}
+ } = State) ->
+ case tls_socket:setopts(Transport, Socket, [{active, N}]) of
+ ok ->
+ {no_record, State#state{protocol_specific = ProtocolSpec#{active_n_toggle => false}}};
+ _ ->
+ self() ! {CloseTag, Socket},
+ {no_record, State}
+ end.
+
%% Decipher next record and concatenate consecutive ?APPLICATION_DATA records into one
%%
next_record(State, CipherTexts, ConnectionStates, Check) ->
@@ -198,28 +226,20 @@ next_record_done(#state{protocol_buffers = Buffers} = State, CipherTexts, Connec
State#state{protocol_buffers = Buffers#protocol_buffers{tls_cipher_texts = CipherTexts},
connection_states = ConnectionStates}}.
-
next_event(StateName, Record, State) ->
next_event(StateName, Record, State, []).
%%
next_event(StateName, no_record, State0, Actions) ->
- case next_record(State0) of
+ case next_record(StateName, State0) of
{no_record, State} ->
{next_state, StateName, State, Actions};
- {#ssl_tls{} = Record, State} ->
- {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]};
- #alert{} = Alert ->
- {next_state, StateName, State0, [{next_event, internal, Alert} | Actions]}
+ {Record, State} ->
+ next_event(StateName, Record, State, Actions)
end;
-next_event(StateName, Record, State, Actions) ->
- case Record of
- no_record ->
- {next_state, StateName, State, Actions};
- #ssl_tls{} = Record ->
- {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]};
- #alert{} = Alert ->
- {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
- end.
+next_event(StateName, #ssl_tls{} = Record, State, Actions) ->
+ {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]};
+next_event(StateName, #alert{} = Alert, State, Actions) ->
+ {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}.
%%% TLS record protocol level application data messages
@@ -869,7 +889,7 @@ next_tls_record(Data, StateName,
case tls_record:get_tls_records(Data, Versions, Buf0) of
{Records, Buf1} ->
CT1 = CT0 ++ Records,
- next_record(State0#state{protocol_buffers =
+ next_record(StateName, State0#state{protocol_buffers =
Buffers#protocol_buffers{tls_record_buffer = Buf1,
tls_cipher_texts = CT1}});
#alert{} = Alert ->