3 files changed, 28 insertions, 3 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 98048c6bc..003ae6db8 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -1,4 +1,4 @@
-. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.78 2010/06/05 21:42:53 pdp Exp $
+. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.79 2010/06/05 23:50:18 pdp Exp $
 .
 . /////////////////////////////////////////////////////////////////////////////
 . This is the primary source of the Exim Manual. It is an xfpt document that is
@@ -9615,6 +9615,21 @@ srandomdev() or srandom(), or a custom implementation even weaker than
 random().
 
 
+.vitem &*${reverse_ip:*&<&'ipaddr'&>&*}*&
+.cindex "expansion" "IP address"
+This operator reverses an IP address; for IPv4 addresses, the result is in
+dotted-quad decimal form, while for IPv6 addreses the result is in
+dotted-nibble hexadecimal form.  In both cases, this is the "natural" form
+for DNS.  For example,
+.code
+${reverse_ip:192.0.2.4} and ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
+.endd
+returns
+.code
+4.2.0.192 and 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
+.endd
+
+
 .vitem &*${rfc2047:*&<&'string'&>&*}*&
 .cindex "expansion" "RFC 2047"
 .cindex "RFC 2047" "expansion operator"
diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 421997b01..0591e4115 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.621 2010/06/05 11:13:29 pdp Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.622 2010/06/05 23:50:18 pdp Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
@@ -31,6 +31,8 @@ PP/08 Bugzilla 926: switch ClamAV to use the new zINSTREAM API for content
       filtering; old API available if built with WITH_OLD_CLAMAV_STREAM=yes
       NB: ClamAV planning to remove STREAM in "middle of 2010".
 
+PP/09 Implemented reverse_ip expansion operator.
+
 
 Exim version 4.72
 -----------------
diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index c4d38fd4f..35ed9a399 100644
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/NewStuff,v 1.168 2010/06/05 11:13:29 pdp Exp $
+$Cambridge: exim/doc/doc-txt/NewStuff,v 1.169 2010/06/05 23:50:18 pdp Exp $
 
 New Features in Exim
 --------------------
@@ -43,6 +43,14 @@ Version 4.73
     malware-scanning framework.  This is intended purely as a debugging aid
     to ensure that Exim's scanning is working, not to replace other tools.
 
+ 5. There is a new expansion operator, "reverse_ip", which will reverse IP
+    addresses; IPv4 into dotted quad, IPv6 into dotted nibble.  Examples:
+
+      ${reverse_ip:192.0.2.4}
+       -> 4.2.0.192
+      ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
+       -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
+
 
 Version 4.72
 ------------