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-rw-r--r--lib/diameter/src/base/diameter_codec.erl40
-rw-r--r--lib/diameter/src/base/diameter_traffic.erl2
2 files changed, 33 insertions, 9 deletions
diff --git a/lib/diameter/src/base/diameter_codec.erl b/lib/diameter/src/base/diameter_codec.erl
index b4ecb63961..3a0a030fc9 100644
--- a/lib/diameter/src/base/diameter_codec.erl
+++ b/lib/diameter/src/base/diameter_codec.erl
@@ -90,7 +90,7 @@ encode(Mod, Msg) ->
msg = Msg}).
e(_, #diameter_packet{msg = [#diameter_header{} = Hdr | As]} = Pkt) ->
- try encode_avps(As) of
+ try encode_avps(reorder(As)) of
Avps ->
Length = size(Avps) + 20,
@@ -183,26 +183,50 @@ values(Avps) ->
%% Message as a list of #diameter_avp{} ...
encode_avps(_, _, [#diameter_avp{} | _] = Avps) ->
- encode_avps(reorder(Avps, [], Avps));
+ encode_avps(reorder(Avps));
%% ... or as a tuple list or record.
encode_avps(Mod, MsgName, Values) ->
Mod:encode_avps(MsgName, Values).
%% reorder/1
+%%
+%% Reorder AVPs for the relay case using the index field of
+%% diameter_avp records. Decode populates this field in collect_avps
+%% and presents AVPs in reverse order. A relay then sends the reversed
+%% list with a Route-Record AVP prepended. The goal here is just to do
+%% lists:reverse/1 in Grouped AVPs and the outer list, but only in the
+%% case there are indexed AVPs at all, so as not to reverse lists that
+%% have been explicilty sent (unindexed, in the desired order) as a
+%% diameter_avp list. The effect is the same as lists:keysort/2, but
+%% only on the cases we expect, not a general sort.
+
+reorder(Avps) ->
+ case reorder(Avps, []) of
+ false ->
+ Avps;
+ Sorted ->
+ Sorted
+ end.
-reorder([#diameter_avp{index = 0} | _] = Avps, Acc, _) ->
+%% reorder/3
+
+%% In case someone has reversed the list already. (Not likely.)
+reorder([#diameter_avp{index = 0} | _] = Avps, Acc) ->
Avps ++ Acc;
-reorder([#diameter_avp{index = N} = A | Avps], Acc, _)
+%% Assume indexed AVPs are in reverse order.
+reorder([#diameter_avp{index = N} = A | Avps], Acc)
when is_integer(N) ->
lists:reverse(Avps, [A | Acc]);
-reorder([H | T], Acc, Avps) ->
- reorder(T, [H | Acc], Avps);
+%% An unindexed AVP.
+reorder([H | T], Acc) ->
+ reorder(T, [H | Acc]);
-reorder([], Acc, _) ->
- Acc.
+%% No indexed members.
+reorder([], _) ->
+ false.
%% encode_avps/1
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl
index 0b503338a6..0c62ccea49 100644
--- a/lib/diameter/src/base/diameter_traffic.erl
+++ b/lib/diameter/src/base/diameter_traffic.erl
@@ -596,7 +596,7 @@ resend(false,
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],
+ Msg = [Hdr, Route | Avps], %% reordered at encode
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,