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There is more to do.
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* ingela/ssl/session-cache-max/OTP-14556:
ssl: Mend Max session handling
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The commit 256e01ce80b3aadd63f303b9bda5722ad313220f was a misunderstanding
that actually broke the implementation.
It is not so important to keep specific max, rather max is a threshold
when the table should be shrinked as to not grow indefinitely.
New sessions are created when the id is created and may be short lived
it they are not registered for reuse due to handshake failure.
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* ingela/ssl/error-msg-enhancment:
ssl: Add the role (server or client) to the alert message
Addition to 972f9121311efcfb50db727ab3e930ebc95ab314 solved in OTP-14236
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* anders/diameter/decode_format/OTP-14511:
Map less in traffic suite
Fix decode_format doc oversights
Rename decode_format false to none
Tweak {decode_format, false} semantics
Fix dialyzer spec
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* anders/diameter/config_consistency/OTP-14555:
Fix strict_arities blunder
Fix minor error-handling blunder
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* anders/diameter/Proxy-Info/OTP-9869:
Fix handling of Proxy-Info in answers formulated by diameter
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* anders/diameter/Experimental-Result/OTP-14511:
Fix extraction of Experimental-Result for counter keys
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* anders/diameter/performance/OTP-14521:
Rename variable
Fix decode of too many generic AVPs
Enumerate AVPs in diameter_avp.index (again)
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* anders/diameter/sctp/OTP-10889:
Send unordered on all outbound diameter_sctp streams
Delay rotation of diameter_sctp outbound streams
Exercise unordered delivery in traffic suite
Use unordered delivery on a lone outbound stream in diameter_sctp
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By just decoding to map in the client, instead of to record first. The
record decode is exercised enough in the server and in other suites.
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diameter_codec(3) referred only to the record format in places. The
configurable format was added in commits 722fa415 and then 55e65b26.
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Which reads better and makes it easier to distinguish this false from
others.
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Represent the decoded message by its atom-valued name in
diameter_packet.msg, which makes trace much more readable. A
diameter_avp.value is untouched (ie. undefined): the AVP name is already
in the name field.
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Which dialyzer hasn't noticed.
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anders/diameter/decode_format/OTP-14511
* anders/diameter/config_consistency/OTP-14555:
Fix strict_arities blunder
Fix minor error-handling blunder
Let strict_mbit and incoming_maxlen be configured per transport
Let a service configure default transport options
Rename type evaluable -> eval
Document transport_opt() strict_capx
Rename transport_opt() capx_strictness to strict_capx
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Remove value from the merged map, not from the maps being merged.
Bundled in commit 5f3becad.
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It is desirable to be as specific as possible in the info message, so
there can be no mistake if the alert is form the peer or generated by
us. This use to be an error message, but it is better to make it an
info message as sending an ALERT ending the connection is an expected
behaviour.
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Leading to this admonition from dialyzer:
diameter_config.erl:670: The variable No can never match since previous
clauses completely covered the type 'ok'
The throw was caught, but resulted in an error return without the
intended information.
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Changes confusing example of a bad guard in ets:fun2ms
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OTP-14574
* rickard/pcre-8.41:
Upgrade to PCRE 8.41 from PCRE 8.40
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RFC 6733 says this:
6.2. Diameter Answer Processing
When a request is locally processed, the following procedures MUST be
applied to create the associated answer, in addition to any
additional procedures that MAY be discussed in the Diameter
application defining the command:
...
o Any Proxy-Info AVPs in the request MUST be added to the answer
message, in the same order they were present in the request.
This wasn't done when a handle_request callback returned a Result-Code
in an 'answer-message' or protocol_error tuple, causing diameter itself
to construct the answer message. This form of answer is just a
convenience, since the callback can always return an answer that it
constructs itself.
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The introduction of decode_format in commit 722fa415 (and then 55e65b26)
meant the value was not necessarily the intended tuple.
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It's no longer the AVP name as of the parent commit, but the name of
the field/member the value will be stored in. Typically the AVP name,
but possibly 'AVP'.
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That is, when the arity of an 'AVP' field has an upper bound. This
shouldn't happen in practice, but if an AVP is known but its name not
explicit in the message grammar then its count was confused with that
of AVPs packed into the 'AVP' field.
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Commit 96cd627a changed the way the index field was used, but the
enumeration is used in at least one known application (as a pointer from
elements of diameter_packet.errors to elements of diameter_packet.avps)
and the motivation for the change is questionable: the lookup that was
avoided was unnecessary given that it was already performed in
incrementing a counter. Revert to enumerating as before in the non-relay
case, but not in the relay case since there's no corresponding usecase.
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Make handling of match contexts stricter
OTP-14591
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* dgud/kernel/fix-hanging-io/OTP-14571:
Always reply to sync requests
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beam_validator could fail issue a diagnostic when a register
that was supposed to be a match context was not guaranteed to
be a match context.
The bug was in merging of types. Merging of a match context with
another term would result in a match context. That is wrong. Merging
should produce a more general type, not a narrower type. Also, the
valid slots in two match contexts should be combined with 'band', not
'bor'.
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There's no reason for sending ordered since request handling is
concurrent: different processes handling incoming requests can't know in
which order they were received on the transport, and different processes
sending requests can't know the order in which they're sent.
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For the same reason as unordered delivery is delayed in the grandparent
commit. Delivery is ordered only within a stream, so until a second
message is received from the peer, there's no guarantee that a second
outgoing request won't be received before the initial capablities
exchange message. Rotation begins upon reception of a second message
from the peer, messages being sent on stream 0 until then.
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* anders/diameter/config_consistency/OTP-14555:
Let strict_mbit and incoming_maxlen be configured per transport
Let a service configure default transport options
Rename type evaluable -> eval
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* anders/diameter/upgrade/OTP-14552:
Fix compatibility of remote send
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* anders/diameter/strict_capx/OTP-14546:
Document transport_opt() strict_capx
Rename transport_opt() capx_strictness to strict_capx
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* anders/diameter/performance/OTP-14521:
Fix influence of decode_format on service events
Work around more common_test woe
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* anders/diameter/loopback_any/OTP-14544:
Use loopback/any config in examples suite
Handle loopback/any as local address in diameter_tcp/sctp
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* anders/diameter/codec/OTP-14511:
Use map decoding in example client
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* anders/diameter/caseless/OTP-14535:
Replace calls to inet_parse(3)
Fix regexp match of accept tuple in diameter_tcp/sctp
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By randomly setting the number of outbound streams on associations.
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RFC 6733 say the below about head-of-line blocking and SCTP, the
suggestion of unordered sending being new compared to the RFC 3588.
Until now, all delivery in diameter_sctp has been ordered, and
roundrobin over available streams unless the user passes a stream
identifier in an outgoing diameter_packet record. This commit changes
this to use unordered delivery when there's only a single outbound
stream to choose from.
The special case at capabilities exchange is handled by only starting to
send unordered after the second message from the peer has been received.
(First message after capabilities exchange, as the RFC probably means.)
The special case at DPR isn't handled, since there's no knowing the
order in which a peer will answer: a node that sends DPR while it has
other requests outstanding can't expect that the latter will be answered
before DPR, even if delivery is ordered since incoming requests are
handled concurrently. If it wants a guarantee then it simply has to wait
for answers before sending DPR.
A user can force all delivery to be unordered by specifying
{sctp_default_send_params, #sctp_sndrcvinfo{flags = [unordered]}}
as a config option to diameter_sctp, but in this case there's no
handling of a request being sent directly after CEA since there's no
ordered flag to override the default.
RFC 6733:
2.1.1. SCTP Guidelines
Diameter messages SHOULD be mapped into SCTP streams in a way that
avoids head-of-the-line (HOL) blocking. Among different ways of
performing the mapping that fulfill this requirement it is
RECOMMENDED that a Diameter node send every Diameter message (request
or response) over stream zero with the unordered flag set. However,
Diameter nodes MAY select and implement other design alternatives for
avoiding HOL blocking such as using multiple streams with the
unordered flag cleared (as originally instructed in RFC 3588). On
the receiving side, a Diameter entity MUST be ready to receive
Diameter messages over any stream, and it is free to return responses
over a different stream. This way, both sides manage the available
streams in the sending direction, independently of the streams chosen
by the other side to send a particular Diameter message. These
messages can be out-of-order and belong to different Diameter
sessions.
Out-of-order delivery has special concerns during a connection
establishment and termination. When a connection is established, the
responder side sends a CEA message and moves to R-Open state as
specified in Section 5.6. If an application message is sent shortly
after the CEA and delivered out-of-order, the initiator side, still
in Wait-I-CEA state, will discard the application message and close
the connection. In order to avoid this race condition, the receiver
side SHOULD NOT use out-of-order delivery methods until the first
message has been received from the initiator, proving that it has
moved to I-Open state. To trigger such a message, the receiver side
could send a DWR immediately after sending a CEA. Upon reception of
the corresponding DWA, the receiver side should start using out-of-
order delivery methods to counter the HOL blocking.
Another race condition may occur when DPR and DPA messages are used.
Both DPR and DPA are small in size; thus, they may be delivered to
the peer faster than application messages when an out-of-order
delivery mechanism is used. Therefore, it is possible that a DPR/DPA
exchange completes while application messages are still in transit,
resulting in a loss of these messages. An implementation could
mitigate this race condition, for example, using timers, and wait for
a short period of time for pending application level messages to
arrive before proceeding to disconnect the transport connection.
Eventually, lost messages are handled by the retransmission mechanism
described in Section 5.5.4.
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Otherwise processes doing io could get stuck.
See ERL-472.
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Decoded CER/CEA messages are passed in events messages that can be
subscribed to using diameter:subscribe/1. A configured decode_format was
not reflected in these, messages always being passed as records.
Clarify that strict_arities only applies to message callbacks.
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