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-rw-r--r--lib/diameter/doc/src/diameter.xml255
1 files changed, 189 insertions, 66 deletions
diff --git a/lib/diameter/doc/src/diameter.xml b/lib/diameter/doc/src/diameter.xml
index 2cbe48ecce..6b84b22eb5 100644
--- a/lib/diameter/doc/src/diameter.xml
+++ b/lib/diameter/doc/src/diameter.xml
@@ -397,10 +397,10 @@ from the peer offers it.</p>
Note that each tuple communicates one or more AVP values.
It is an error to specify duplicate tuples.</p>
-<marker id="evaluable"/>
+<marker id="eval"/>
</item>
-<tag><c>evaluable() = {M,F,A} | fun() | [evaluable() | A]</c></tag>
+<tag><c>eval() = {M,F,A} | fun() | [eval() | A]</c></tag>
<item>
<p>
An expression that can be evaluated as a function in the following
@@ -418,7 +418,7 @@ eval(F) ->
</pre>
<p>
-Applying an <c>&evaluable;</c>
+Applying an <c>&eval;</c>
<c>E</c> to an argument list <c>A</c>
is meant in the sense of <c>eval([E|A])</c>.</p>
@@ -484,11 +484,11 @@ Matches only those peers whose Origin-Realm has the
specified value, or all peers if the atom <c>any</c>.</p>
</item>
-<tag><c>{eval, &evaluable;}</c></tag>
+<tag><c>{eval, &eval;}</c></tag>
<item>
<p>
Matches only those peers for which the specified
-<c>&evaluable;</c> returns
+<c>&eval;</c> returns
<c>true</c> when applied to the connection's <c>diameter_caps</c>
record.
Any other return value or exception is equivalent to <c>false</c>.</p>
@@ -650,7 +650,7 @@ Result = ResultCode | {capabilities_cb, CB, ResultCode|discard}
Caps = #diameter_caps{}
Pkt = #diameter_packet{}
ResultCode = integer()
-CB = &evaluable;
+CB = &eval;
</pre>
<p>
@@ -798,15 +798,31 @@ be matched by corresponding &capability; configuration, of
</item>
<tag>
-<marker id="incoming_maxlen"/><c>{incoming_maxlen, 0..16777215}</c></tag>
+<marker id="decode_format"/>
+<c>{decode_format, record | list | map | none}</c></tag>
<item>
<p>
-Bound on the expected size of incoming Diameter messages.
-Messages larger than the specified number of bytes are discarded.</p>
+The format of decoded messages and grouped AVPs in the <c>msg</c> field
+of diameter_packet records and <c>value</c> field of diameter_avp
+records respectively.
+If <c>record</c> then a record whose definition is generated from the
+dictionary file in question.
+If <c>list</c> or <c>map</c> then a <c>[Name | Avps]</c> pair where
+<c>Avps</c> is a list of AVP name/values pairs or a map keyed on
+AVP names respectively.
+If <c>none</c> then the atom-value message name, or <c>undefined</c>
+for a Grouped AVP.
+See also &codec_message;.</p>
<p>
-Defaults to <c>16777215</c>, the maximum value of the 24-bit Message
-Length field in a Diameter Header.</p>
+Defaults to <c>record</c>.</p>
+
+<note>
+<p>
+AVPs are decoded into a list of diameter_avp records in <c>avps</c>
+field of diameter_packet records independently of
+<c>decode_format</c>.</p>
+</note>
</item>
@@ -814,7 +830,7 @@ Length field in a Diameter Header.</p>
| node
| nodes
| [node()]
- | evaluable()}</c></tag>
+ | eval()}</c></tag>
<item>
<p>
The degree to which the service allows multiple transport
@@ -825,7 +841,7 @@ at capabilities exchange.</p>
If <c>[node()]</c> then a connection is rejected if another already
exists on any of the specified nodes.
Types <c>false</c>, <c>node</c>, <c>nodes</c> and
-&evaluable; are equivalent to
+&eval; are equivalent to
<c>[]</c>, <c>[node()]</c>, <c>[node()|nodes()]</c> and the
evaluated value respectively, evaluation of each expression taking
place whenever a new connection is to be established.
@@ -840,7 +856,7 @@ by their own peer and watchdog state machines.</p>
Defaults to <c>nodes</c>.</p>
</item>
-<tag><c>{sequence, {H,N} | &evaluable;}</c></tag>
+<tag><c>{sequence, {H,N} | &eval;}</c></tag>
<item>
<p>
A constant value <c>H</c> for the topmost <c>32-N</c> bits of
@@ -875,7 +891,7 @@ outgoing requests.</p>
</warning>
</item>
-<tag><c>{share_peers, boolean() | [node()] | evaluable()}</c></tag>
+<tag><c>{share_peers, boolean() | [node()] | eval()}</c></tag>
<item>
<p>
Nodes to which peer connections established on the local
@@ -888,7 +904,7 @@ configured to use them: see <c>use_shared_peers</c> below.</p>
If <c>false</c> then peers are not shared.
If <c>[node()]</c> then peers are shared with the specified list of
nodes.
-If <c>evaluable()</c> then peers are shared with the nodes returned
+If <c>eval()</c> then peers are shared with the nodes returned
by the specified function, evaluated whenever a peer connection
becomes available or a remote service requests information about local
connections.
@@ -914,59 +930,36 @@ of a single Diameter node across multiple Erlang nodes.</p>
</note>
</item>
-<tag><c>{spawn_opt, [term()]}</c></tag>
-<item>
-<p>
-Options list passed to &spawn_opt; when spawning a process for an
-incoming Diameter request, unless the transport in question
-specifies another value.
-Options <c>monitor</c> and <c>link</c> are ignored.</p>
-
-<p>
-Defaults to the empty list.</p>
-</item>
-
<tag>
-<marker id="strict_mbit"/><c>{strict_mbit, boolean()}</c></tag>
+<marker id="strict_arities"/><c>{strict_arities, boolean()
+ | encode
+ | decode}</c></tag>
<item>
<p>
-Whether or not to regard an AVP setting the M-bit as erroneous when
-the command grammar in question does not explicitly allow the AVP.
-If <c>true</c> then such AVPs are regarded as 5001 errors,
-DIAMETER_AVP_UNSUPPORTED.
-If <c>false</c> then the M-bit is ignored and policing
-it becomes the receiver's responsibility.</p>
+Whether or not to require that the number of AVPs in a message or
+grouped AVP agree with those specified in the dictionary in question
+when passing messages to &man_app; callbacks.
+If <c>true</c> then mismatches in an outgoing messages cause message
+encoding to fail, while mismatches in an incoming message are reported
+as 5005/5009 errors in the errors field of the diameter_packet record
+passed to &app_handle_request; or &app_handle_answer; callbacks.
+If <c>false</c> then neither error is enforced/detected.
+If <c>encode</c> or <c>decode</c> then errors are only
+enforced/detected on outgoing or incoming messages respectively.</p>
<p>
Defaults to <c>true</c>.</p>
-<warning>
-<p>
-RFC 6733 is unclear about the semantics of the M-bit.
-One the one hand, the CCF specification in section 3.2 documents AVP
-in a command grammar as meaning <em>any</em> arbitrary AVP; on the
-other hand, 1.3.4 states that AVPs setting the M-bit cannot be added
-to an existing command: the modified command must instead be
-placed in a new Diameter application.</p>
-<p>
-The reason for the latter is presumably interoperability:
-allowing arbitrary AVPs setting the M-bit in a command makes its
-interpretation implementation-dependent, since there's no
-guarantee that all implementations will understand the same set of
-arbitrary AVPs in the context of a given command.
-However, interpreting <c>AVP</c> in a command grammar as any
-AVP, regardless of M-bit, renders 1.3.4 meaningless, since the receiver
-can simply ignore any AVP it thinks isn't relevant, regardless of the
-sender's intent.</p>
+<note>
<p>
-Beware of confusing mandatory in the sense of the M-bit with mandatory
-in the sense of the command grammar.
-The former is a semantic requirement: that the receiver understand the
-semantics of the AVP in the context in question.
-The latter is a syntactic requirement: whether or not the AVP must
-occur in the message in question.</p>
-</warning>
-
+Disabling arity checks affects the form of messages at encode/decode.
+In particular, decoded AVPs are represented as lists of values,
+regardless of the AVP's arity (ie. expected number in the message/AVP
+grammar in question), and values are expected to be supplied as lists
+at encode.
+This differs from the historic decode behaviour of representing AVPs
+of arity 1 as bare values, not wrapped in a list.</p>
+</note>
</item>
<tag>
@@ -993,7 +986,27 @@ The default value is for backwards compatibility.</p>
</item>
-<tag><c>{use_shared_peers, boolean() | [node()] | evaluable()}</c></tag>
+<tag>
+<marker id="traffic_counters"/><c>{traffic_counters, boolean()}</c></tag>
+<item>
+<p>
+Whether or not to count application-specific messages; those for which
+&man_app; callbacks take place.
+If false then only messages handled by diameter itself are counted:
+CER/CEA, DWR/DWA, DPR/DPA.</p>
+
+<p>
+Defaults to <c>true</c>.</p>
+
+<note>
+<p>
+Disabling counters is a performance improvement, but means that the
+omitted counters are not returned by &service_info;.</p>
+</note>
+
+</item>
+
+<tag><c>{use_shared_peers, boolean() | [node()] | eval()}</c></tag>
<item>
<p>
Nodes from which communicated peers are made available in
@@ -1003,7 +1016,7 @@ the remote candidates list of &app_pick_peer; callbacks.</p>
If <c>false</c> then remote peers are not used.
If <c>[node()]</c> then only peers from the specified list of nodes
are used.
-If <c>evaluable()</c> then only peers returned by the specified
+If <c>eval()</c> then only peers returned by the specified
function are used, evaluated whenever a remote service communicates
information about an available peer connection.
The value <c>true</c> is equivalent to <c>fun &nodes;</c>.
@@ -1028,6 +1041,15 @@ each node from which requests are sent.</p>
</warning>
</item>
+<tag><c>&transport_opt;</c></tag>
+<item>
+<p>
+Any transport option except <c>applications</c> or
+<c>capabilities</c>.
+Used as defaults for transport configuration, values passed to
+&add_transport; overriding values configured on the service.</p>
+</item>
+
</taglist>
<marker id="transport_opt"/>
@@ -1061,6 +1083,37 @@ implies having to set matching *-Application-Id AVPs in a
</item>
<tag>
+<marker id="avp_dictionaries"/><c>{avp_dictionaries, [module()]}</c></tag>
+<item>
+<p>
+A list of alternate dictionary modules with which to encode/decode
+AVPs that are not defined by the dictionary of the application in
+question.
+At decode, such AVPs are represented as diameter_avp records in the
+<c>'AVP'</c> field of a decoded message or Grouped AVP, the first
+alternate that succeeds in decoding the AVP setting the record's value
+field.
+At encode, values in an <c>'AVP'</c> list can be passed as AVP
+name/value 2-tuples, and it is an encode error for no alternate to
+define the AVP of such a tuple.</p>
+
+<p>
+Defaults to the empty list.</p>
+
+<note>
+<p>
+The motivation for alternate dictionaries is RFC 7683, Diameter
+Overload Indication Conveyance (DOIC), which defines AVPs to
+be piggybacked onto existing application messages rather than defining
+an application of its own.
+The DOIC dictionary is provided by the diameter application, as module
+<c>diameter_gen_doic_rfc7683</c>, but alternate dictionaries can be
+used to encode/decode any set of AVPs not known to an application
+dictionary.</p>
+</note>
+</item>
+
+<tag>
<marker id="capabilities"/><c>{capabilities, [&capability;]}</c></tag>
<item>
<p>
@@ -1075,7 +1128,7 @@ TLS is desired over TCP as implemented by &man_tcp;.</p>
</item>
<tag>
-<marker id="capabilities_cb"/><c>{capabilities_cb, &evaluable;}</c></tag>
+<marker id="capabilities_cb"/><c>{capabilities_cb, &eval;}</c></tag>
<item>
<p>
Callback invoked upon reception of CER/CEA during capabilities
@@ -1169,7 +1222,7 @@ transport.</p>
</item>
<tag>
-<marker id="disconnect_cb"/><c>{disconnect_cb, &evaluable;}</c></tag>
+<marker id="disconnect_cb"/><c>{disconnect_cb, &eval;}</c></tag>
<item>
<p>
Callback invoked prior to terminating the transport process of a
@@ -1269,6 +1322,19 @@ Defaults to 5000.</p>
</item>
<tag>
+<marker id="incoming_maxlen"/><c>{incoming_maxlen, 0..16777215}</c></tag>
+<item>
+<p>
+Bound on the expected size of incoming Diameter messages.
+Messages larger than the specified number of bytes are discarded.</p>
+
+<p>
+Defaults to <c>16777215</c>, the maximum value of the 24-bit Message
+Length field in a Diameter Header.</p>
+
+</item>
+
+<tag>
<marker id="length_errors"/><c>{length_errors, exit|handle|discard}</c></tag>
<item>
<p>
@@ -1326,7 +1392,64 @@ incoming Diameter request.
Options <c>monitor</c> and <c>link</c> are ignored.</p>
<p>
-Defaults to the list configured on the service if not specified.</p>
+Defaults to the empty list.</p>
+</item>
+
+<tag>
+<marker id="strict_capx"/><c>{strict_capx, boolean()]}</c></tag>
+<item>
+<p>
+Whether or not to enforce the RFC 6733 requirement that any message
+before capabilities exchange should close the peer connection.
+If false then unexpected messages are discarded.</p>
+
+<p>
+Defaults to true.
+Changing this results in non-standard behaviour, but can be useful in
+case peers are known to be behave badly.</p>
+</item>
+
+<tag>
+<marker id="strict_mbit"/><c>{strict_mbit, boolean()}</c></tag>
+<item>
+<p>
+Whether or not to regard an AVP setting the M-bit as erroneous when
+the command grammar in question does not explicitly allow the AVP.
+If <c>true</c> then such AVPs are regarded as 5001 errors,
+DIAMETER_AVP_UNSUPPORTED.
+If <c>false</c> then the M-bit is ignored and policing
+it becomes the receiver's responsibility.</p>
+
+<p>
+Defaults to <c>true</c>.</p>
+
+<warning>
+<p>
+RFC 6733 is unclear about the semantics of the M-bit.
+One the one hand, the CCF specification in section 3.2 documents AVP
+in a command grammar as meaning <em>any</em> arbitrary AVP; on the
+other hand, 1.3.4 states that AVPs setting the M-bit cannot be added
+to an existing command: the modified command must instead be
+placed in a new Diameter application.</p>
+<p>
+The reason for the latter is presumably interoperability:
+allowing arbitrary AVPs setting the M-bit in a command makes its
+interpretation implementation-dependent, since there's no
+guarantee that all implementations will understand the same set of
+arbitrary AVPs in the context of a given command.
+However, interpreting <c>AVP</c> in a command grammar as any
+AVP, regardless of M-bit, renders 1.3.4 meaningless, since the receiver
+can simply ignore any AVP it thinks isn't relevant, regardless of the
+sender's intent.</p>
+<p>
+Beware of confusing mandatory in the sense of the M-bit with mandatory
+in the sense of the command grammar.
+The former is a semantic requirement: that the receiver understand the
+semantics of the AVP in the context in question.
+The latter is a syntactic requirement: whether or not the AVP must
+occur in the message in question.</p>
+</warning>
+
</item>
<tag>