Let diameter_{tcp,sctp} be configured with permissible remote addresses

Option 'accept' allows remote addresses to be configured as tuples or
regular expressions. The remote addresses for any incoming (aka
accepted) connection/association are matched against the configured
values, any non-matching address causing the connection/association to
be aborted.

2 files changed, 33 insertions, 4 deletions

diff --git a/lib/diameter/doc/src/diameter_sctp.xml b/lib/diameter/doc/src/diameter_sctp.xml
index df140b16b9..5fe14b1ef6 100644
--- a/lib/diameter/doc/src/diameter_sctp.xml
+++ b/lib/diameter/doc/src/diameter_sctp.xml
@@ -70,10 +70,15 @@ and implements the behaviour documented in
 <v>Type = connect | accept</v>
 <v>Ref = &mod_transport_ref;</v>
 <v>Svc = #diameter_service{}</v>
-<v>Opt = {raddr, &ip_address;} | {rport, integer()} | term()</v>
+<v>Opt = OwnOpt | SctpOpt</v>
 <v>Pid = pid()</v>
 <v>LAddr = &ip_address;</v>
 <v>Reason = term()</v>
+<v>OwnOpt = {raddr, &ip_address;}
+          | {rport, integer()}
+          | {accept, Match}</v>
+<v>SctpOpt = term()</v>
+<v>Match = &ip_address; | string() | [Match]</v>
 </type>
 <desc>
 
@@ -85,9 +90,20 @@ Options <c>raddr</c> and <c>rport</c> specify the remote address
 and port for a connecting transport and not valid for a listening
 transport: the former is required while latter defaults to 3868 if
 unspecified.
-More than one <c>raddr</c> option can be specified, in which case the
+Mupltiple <c>raddr</c> options can be specified, in which case the
 connecting transport in question attempts each in sequence until
-an association is established.
+an association is established.</p>
+
+<p>
+Option <c>accept</c> specifies remote addresses for a listening
+transport and is not valid for a connecting transport.
+If specified, a remote address that does not match one of the
+specified addresses causes the association to be aborted.
+Multiple <c>accept</c> options can be specified.
+A string-valued <c>Match</c> that does not parse as an address is
+interpreted as a regular expression.</p>
+
+<p>
 Remaining options are any accepted by &gen_sctp_open1;, with the exception
 of options <c>mode</c>, <c>binary</c>, <c>list</c>, <c>active</c>
 and <c>sctp_events</c>.
diff --git a/lib/diameter/doc/src/diameter_tcp.xml b/lib/diameter/doc/src/diameter_tcp.xml
index 8e509aa829..ce4d6cfd0f 100644
--- a/lib/diameter/doc/src/diameter_tcp.xml
+++ b/lib/diameter/doc/src/diameter_tcp.xml
@@ -96,10 +96,12 @@ before configuring TLS capability on diameter transports.</p>
 <v>Reason = term()</v>
 <v>OwnOpt = {raddr, &ip_address;}
           | {rport, integer()}
+          | {accept, Match}
           | {port, integer()}
           | {fragment_timer, infinity | 0..16#FFFFFFFF}</v>
 <v>SslOpt = {ssl_options, true | list()}</v>
 <v>TcpOpt = term()</v>
+<v>Match = &ip_address; | string() | [Match]</v>
 </type>
 <desc>
 
@@ -109,7 +111,18 @@ The start function required by &man_transport;.</p>
 <p>
 Options <c>raddr</c> and <c>rport</c> specify the remote address
 and port for a connecting transport and are not valid for a listening
-transport.
+transport.</p>
+
+<p>
+Option <c>accept</c> specifies remote addresses for a listening
+transport and is not valid for a connecting transport.
+If specified, a remote address that does not match one of the
+specified addresses causes the connection to be aborted.
+Multiple <c>accept</c> options can be specified.
+A string-valued <c>Match</c> that does not parse as an address is
+interpreted as a regular expression.</p>
+
+<p>
 Option <c>ssl_options</c> must be specified for a transport
 that should support TLS: a value of <c>true</c> results in a
 TLS handshake immediately upon connection establishment while