Merge branch 'maint'

7 files changed, 378 insertions, 158 deletions

diff --git a/lib/snmp/doc/src/notes.xml b/lib/snmp/doc/src/notes.xml
index 9acc613467..9c61bae85a 100644
--- a/lib/snmp/doc/src/notes.xml
+++ b/lib/snmp/doc/src/notes.xml
@@ -34,6 +34,86 @@
 
 
   <section>
+    <title>SNMP Development Toolkit 4.24.1</title>
+    <p>Version 4.24.1 supports code replacement in runtime from/to
+    version 4.24, 4.23.1 and 4.23. </p>
+
+    <section>
+      <title>Improvements and new features</title>
+      <p>-</p>
+
+<!--
+      <list type="bulleted">
+        <item>
+          <p>[agent,manager] Updated to support the new crypto interface. </p>
+          <p>Own Id: OTP-11009</p>
+        </item>
+
+      </list>
+-->
+
+    </section>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+<!--
+      <p>-</p>
+-->
+
+      <list type="bulleted">
+        <item>
+          <p>[agent] Reading the value of the vacmViewTreeFamilyMask returns 
+	  it in the wrong (internal bitlist) format. </p>
+	  <p>The vacmViewTreeFamilyMask is defined as a bit string in the MIB
+	  (OCTET STRING). Internally a bitlist (list of 1's and 0's, 
+	  see <seealso marker="snmp_agent_config_files#vacm">vacm config file</seealso>
+	  for more info) is used. 
+	  However, the MIB implementation assumed the latter, effectively
+	  rendering all attempts to read/set masks via SNMP unsuccessful. </p>
+	  <p>Since the mask is used in hot paths (e.g. access permission checks 
+	  for each SNMP operation, the bitlist representation of the mask has 
+	  benefits (e.g. faster processing). Reading/writing the view mask 
+	  objects is less time-critical. Therefore, to fix the issue, convert 
+	  between the bitlist (internal) representation and bitstring 
+	  (external) when the vacmViewTreeFamilyMask objects are accessed. </p>
+	  <p>Also, the check of the vacm config file was invalid with 
+	  regard to the mask value. It was assumed to be a proper oid, which 
+	  is not strictly the case (see bitlist above). </p>
+          <p>Own Id: OTP-11177</p>
+	  <p>Stefan Zegenhagen</p>
+        </item>
+
+        <item>
+          <p>[agent] The counter increment function in the local-db was  
+	  incorrect. It did not handle counter wrap correctly. </p>
+          <p>Own Id: OTP-11192</p>
+        </item>
+
+      </list>
+
+    </section>
+
+    <section>
+      <title>Incompatibilities</title>
+      <p>-</p>
+
+<!--
+      <list type="bulleted">
+        <item>
+          <p>[manager] The old Addr-and-Port based API functions, previously
+	  long deprecated and marked for deletion in R16B, has now been
+	  removed. </p>
+          <p>Own Id: OTP-10027</p>
+        </item>
+
+      </list>
+-->
+    </section>
+
+  </section> <!-- 4.24.1 -->
+
+
+  <section>
     <title>SNMP Development Toolkit 4.24</title>
     <p>Version 4.24 supports code replacement in runtime from/to
     version 4.23.1 and 4.23. </p>
diff --git a/lib/snmp/doc/src/snmp_agent_config_files.xml b/lib/snmp/doc/src/snmp_agent_config_files.xml
index a24f82f005..1e8e879814 100644
--- a/lib/snmp/doc/src/snmp_agent_config_files.xml
+++ b/lib/snmp/doc/src/snmp_agent_config_files.xml
@@ -32,13 +32,15 @@
     <file>snmp_agent_config_files.xml</file>
   </header>
   <p>All configuration data must be included in configuration files
-    that are located in the configuration directory. The name of this
-    directory is given in the <c>config_dir</c> configuration
-    parameter.  These files are read at start-up, and are used to
-    initialize the SNMPv2-MIB or STANDARD-MIB, SNMP-FRAMEWORK-MIB,
-    SNMP-MPD-MIB, SNMP-VIEW-BASED-ACM-MIB, SNMP-COMMUNITY-MIB,
-    SNMP-USER-BASED-SM-MIB, SNMP-TARGET-MIB and SNMP-NOTIFICATION-MIB
-    (refer to the <seealso marker="snmp_agent_funct_descr#management">Management of the Agent</seealso> for a description of the MIBs). </p>
+  that are located in the configuration directory. The name of this
+  directory is given in the <c>config_dir</c> configuration
+  parameter.  These files are read at start-up, and are used to
+  initialize the SNMPv2-MIB or STANDARD-MIB, SNMP-FRAMEWORK-MIB,
+  SNMP-MPD-MIB, SNMP-VIEW-BASED-ACM-MIB, SNMP-COMMUNITY-MIB,
+  SNMP-USER-BASED-SM-MIB, SNMP-TARGET-MIB and SNMP-NOTIFICATION-MIB
+  (refer to the 
+  <seealso marker="snmp_agent_funct_descr#management">Management of the Agent</seealso> 
+  for a description of the MIBs). </p>
   <p>The files are: </p>
   <list type="bulleted">
     <item>
@@ -79,35 +81,35 @@
     </item>
   </list>
   <p>The directory where the configuration files are found is given as
-    a parameter to the agent. </p>
+  a parameter to the agent. </p>
   <p>The entry format in all files are Erlang terms, separated by a
-    '<em>.</em>' and a <em>newline</em>. In the following sections, the
-    formats of these terms are described. Comments may be specified as
-    ordinary Erlang comments. </p>
+  '<em>.</em>' and a <em>newline</em>. In the following sections, the
+  formats of these terms are described. Comments may be specified as
+  ordinary Erlang comments. </p>
   <p>Syntax errors in these files are discovered and reported with the
-    function <c>config_err/2</c> of the error report module at start-up. </p>
-
+  function <c>config_err/2</c> of the error report module at start-up. </p>
+  
+  <marker id="agent_information"></marker>
+  
   <section>
-    <marker id="agent_information"></marker>
     <title>Agent Information</title>
     <p>The agent information should be stored in a file called
-      <c>agent.conf</c>.
-      </p>
-    <p>Each entry is a tuple of size two:
-      </p>
+    <c>agent.conf</c>. </p>
+    <p>Each entry is a tuple of size two:</p>
     <p><c>{AgentVariable, Value}.</c></p>
     <list type="bulleted">
-      <item><c>AgentVariable</c> is one of the variables is
-       SNMP-FRAMEWORK-MIB or one of the internal variables
-      <c>intAgentUDPPort</c>, which defines which UDP port the agent
-       listens to, or <c>intAgentIpAddress</c>, which defines the IP
-       address of the agent.
+      <item>
+	<p><c>AgentVariable</c> is one of the variables is
+	SNMP-FRAMEWORK-MIB or one of the internal variables
+	<c>intAgentUDPPort</c>, which defines which UDP port the agent
+	listens to, or <c>intAgentIpAddress</c>, which defines the IP
+	address of the agent. </p>
       </item>
-      <item><c>Value</c> is the value for the variable.
+      <item>
+	<p><c>Value</c> is the value for the variable.</p>
       </item>
     </list>
-    <p>The following example shows a <c>agent.conf</c> file: 
-      </p>
+    <p>The following example shows a <c>agent.conf</c> file: </p>
     <pre>
 {intAgentUDPPort, 4000}.
 {intAgentIpAddress,[141,213,11,24]}.
@@ -115,49 +117,47 @@
 {snmpEngineMaxPacketSize, 484}.
     </pre>
     <p>The value of <c>snmpEngineID</c> is a string, which for a 
-      deployed agent should have a very specific structure. See
-      RFC 2271/2571 for details.
-      </p>
+    deployed agent should have a very specific structure. See
+    RFC 2271/2571 for details.</p>
+
+    <marker id="context"></marker>
   </section>
 
   <section>
-    <marker id="context"></marker>
     <title>Contexts</title>
     <p>The context information should be stored in a file called
-      <c>context.conf</c>.  The default context <c>""</c>
-      need not be present.
-      </p>
+    <c>context.conf</c>.  The default context <c>""</c>
+    need not be present.</p>
     <p>Each row defines a context in the agent.  This information is
-      used in the table <c>vacmContextTable</c> in the
-      SNMP-VIEW-BASED-ACM-MIB.
-      </p>
-    <p>Each entry is a term:
-      </p>
+    used in the table <c>vacmContextTable</c> in the
+    SNMP-VIEW-BASED-ACM-MIB.</p>
+    <p>Each entry is a term:</p>
     <p><c>ContextName.</c></p>
     <list type="bulleted">
-      <item><c>ContextName</c> is a string.
+      <item>
+	<p><c>ContextName</c> is a string.</p>
       </item>
     </list>
+
+    <marker id="system_information"></marker>
   </section>
 
   <section>
-    <marker id="system_information"></marker>
     <title>System Information</title>
     <p>The system information should be stored in a file called
-      <c>standard.conf</c>.
-      </p>
-    <p>Each entry is a tuple of size two:
-      </p>
+    <c>standard.conf</c>.</p>
+    <p>Each entry is a tuple of size two:</p>
     <p><c>{SystemVariable, Value}.</c></p>
     <list type="bulleted">
-      <item><c>SystemVariable</c> is one of the variables in the
-       system group, or <c>snmpEnableAuthenTraps</c>.
+      <item>
+	<p><c>SystemVariable</c> is one of the variables in the
+	system group, or <c>snmpEnableAuthenTraps</c>. </p>
       </item>
-      <item><c>Value</c> is the value for the variable.
+      <item>
+	<p><c>Value</c> is the value for the variable. </p>
       </item>
     </list>
-    <p>The following example shows a valid <c>standard.conf</c> file: 
-      </p>
+    <p>The following example shows a valid <c>standard.conf</c> file: </p>
     <pre>
 {sysDescr, "Erlang SNMP agent"}.
 {sysObjectID, [1,2,3]}.
@@ -167,59 +167,60 @@
 {snmpEnableAuthenTraps, enabled}.
     </pre>
     <p>A value must be provided for all variables, which lack default
-      values in the MIB.
-      </p>
+    values in the MIB. </p>
+
+    <marker id="community"></marker>
   </section>
 
   <section>
-    <marker id="community"></marker>
     <title>Communities</title>
     <p>The community information should be stored in a file called
-      <c>community.conf</c>.  It must be present if the agent is
-      configured for SNMPv1 or SNMPv2c.
-      </p>
+    <c>community.conf</c>. It must be present if the agent is
+    configured for SNMPv1 or SNMPv2c. </p>
     <p>An SNMP <em>community</em> is a relationship between an SNMP
     agent and a set of SNMP managers that defines authentication, access 
     control and proxy characteristics. </p>
     <p>The corresponding table is <c>snmpCommunityTable</c> in the
-      SNMP-COMMUNITY-MIB. </p>
+    SNMP-COMMUNITY-MIB. </p>
     <p>Each entry is a term: </p>
-    <p><c>{CommunityIndex, CommunityName, SecurityName, ContextName, TransportTag}.</c></p>
+    <p><c>{CommunityIndex, CommunityName, SecurityName, ContextName, TransportTag}.</c> </p>
     <list type="bulleted">
-      <item><c>CommunityIndex</c> is a non-empty string.
+      <item>
+	<p><c>CommunityIndex</c> is a non-empty string.</p>
       </item>
-      <item><c>CommunityName</c> is a string.
+      <item>
+	<p><c>CommunityName</c> is a string.</p>
       </item>
-      <item><c>SecurityName</c> is a string.
+      <item>
+	<p><c>SecurityName</c> is a string.</p>
       </item>
-      <item><c>ContextName</c> is a string.
+      <item>
+	<p><c>ContextName</c> is a string.</p>
       </item>
-      <item><c>TransportTag</c> is a string.
+      <item>
+	<p><c>TransportTag</c> is a string.</p>
       </item>
     </list>
+
+    <marker id="vacm"></marker>
   </section>
 
   <section>
-    <marker id="vacm"></marker>
     <title>MIB Views for VACM</title>
     <p>The information about MIB Views for VACM should be stored in a 
-      file called
-      <c>vacm.conf</c>.
-      </p>
+    file called <c>vacm.conf</c>.</p>
     <p>The corresponding tables are <c>vacmSecurityToGroupTable</c>,
-      <c>vacmAccessTable</c> and <c>vacmViewTreeFamilyTable</c> in the
-      SNMP-VIEW-BASED-ACM-MIB.
-      </p>
+    <c>vacmAccessTable</c> and <c>vacmViewTreeFamilyTable</c> in the
+    SNMP-VIEW-BASED-ACM-MIB.</p>
     <p>Each entry is one of the terms, one entry corresponds to one
-      row in one of the tables.
-      </p>
+    row in one of the tables.</p>
     <p><c>{vacmSecurityToGroup, SecModel, SecName, GroupName}.</c></p>
     <p><c>{vacmAccess, GroupName, Prefix, SecModel, SecLevel, Match, ReadView, WriteView, NotifyView}.</c></p>
     <p><c>{vacmViewTreeFamily, ViewIndex, ViewSubtree, ViewStatus, ViewMask}.</c></p>
     <list type="bulleted">
       <item>
         <p><c>SecModel</c> is <c>any</c>, <c>v1</c>, <c>v2c</c>, or
-          <c>usm</c>.</p>
+	<c>usm</c>.</p>
       </item>
       <item>
         <p><c>SecName</c> is a string.</p>
@@ -232,7 +233,7 @@
       </item>
       <item>
         <p><c>SecLevel</c> is <c>noAuthNoPriv</c>, <c>authNoPriv</c>,
-          or <c>authPriv</c></p>
+	or <c>authPriv</c></p>
       </item>
       <item>
         <p><c>Match</c> is <c>prefix</c> or <c>exact</c>.</p>
@@ -244,8 +245,7 @@
         <p><c>WriteView</c> is a string.</p>
       </item>
       <item>
-        <p><c>NotifyView</c> is a string.
-          </p>
+        <p><c>NotifyView</c> is a string.</p>
       </item>
       <item>
         <p><c>ViewIndex</c> is an integer.</p>
@@ -258,33 +258,29 @@
       </item>
       <item>
         <p><c>ViewMask</c> is either <c>null</c> or a list of ones and
-          zeros. Ones nominate that an exact match is used for this
-          sub-identifier. Zeros are wild-cards which match any
-          sub-identifier. If the mask is shorter than the sub-tree, the
-          tail is regarded as all ones. <c>null</c> is shorthand for a
-          mask with all ones.</p>
+	zeros. Ones nominate that an exact match is used for this
+	sub-identifier. Zeros are wild-cards which match any
+	sub-identifier. If the mask is shorter than the sub-tree, the
+	tail is regarded as all ones. <c>null</c> is shorthand for a
+	mask with all ones. </p>
       </item>
     </list>
+
+    <marker id="usm"></marker>
   </section>
 
   <section>
-    <marker id="usm"></marker>
     <title>Security data for USM</title>
     <p>The information about Security data for USM should be stored in a 
-      file called
-      <c>usm.conf</c>, which must be present if the agent is configured
-      for SNMPv3.
-      </p>
+    file called <c>usm.conf</c>, which must be present if the agent is 
+    configured for SNMPv3. </p>
     <p>The corresponding table is <c>usmUserTable</c> in the
-      SNMP-USER-BASED-SM-MIB.
-      </p>
-    <p>Each entry is a term:
-      </p>
+    SNMP-USER-BASED-SM-MIB.</p>
+    <p>Each entry is a term:</p>
     <p><c>{EngineID, UserName, SecName, Clone, AuthP, AuthKeyC, OwnAuthKeyC, PrivP, PrivKeyC, OwnPrivKeyC, Public, AuthKey, PrivKey}.</c></p>
     <list type="bulleted">
       <item>
-        <p><c>EngineID</c> is a string.
-          </p>
+        <p><c>EngineID</c> is a string.</p>
       </item>
       <item>
         <p><c>UserName</c> is a string.</p>
@@ -297,7 +293,7 @@
       </item>
       <item>
         <p><c>AuthP</c> is a <c>usmNoAuthProtocol</c>,
-          <c>usmHMACMD5AuthProtocol</c>, or <c>usmHMACSHAAuthProtocol</c>.</p>
+	<c>usmHMACMD5AuthProtocol</c>, or <c>usmHMACSHAAuthProtocol</c>.</p>
       </item>
       <item>
         <p><c>AuthKeyC</c> is a string.</p>
@@ -307,7 +303,7 @@
       </item>
       <item>
         <p><c>PrivP</c> is a <c>usmNoPrivProtocol</c>, 
-          <c>usmDESPrivProtocol</c> or <c>usmAesCfb128Protocol</c>.</p>
+	<c>usmDESPrivProtocol</c> or <c>usmAesCfb128Protocol</c>.</p>
       </item>
       <item>
         <p><c>PrivKeyC</c> is a string.</p>
@@ -319,66 +315,59 @@
         <p><c>Public</c> is a string.</p>
       </item>
       <item>
-        <p><c>AuthKey</c> is a list (of integer).  This is the User's secret
-          localized authentication key.  It is not visible in the MIB.  The length
-          of this key needs to be 16 if <c>usmHMACMD5AuthProtocol</c> is used, and 
-          20 if <c>usmHMACSHAAuthProtocol</c> is used.</p>
+        <p><c>AuthKey</c> is a list (of integer). This is the User's secret
+	localized authentication key. It is not visible in the MIB. The length
+	of this key needs to be 16 if <c>usmHMACMD5AuthProtocol</c> is used, 
+	and 20 if <c>usmHMACSHAAuthProtocol</c> is used.</p>
       </item>
       <item>
         <p><c>PrivKey</c> is a list (of integer).  This is the User's secret
-          localized encryption key.  It is not visible in the MIB.  The length
-          of this key needs to be 16 if <c>usmDESPrivProtocol</c> or 
-          <c>usmAesCfb128Protocol</c> is used.
-          </p>
+	localized encryption key.  It is not visible in the MIB.  The length
+	of this key needs to be 16 if <c>usmDESPrivProtocol</c> or 
+	<c>usmAesCfb128Protocol</c> is used. </p>
       </item>
     </list>
+
+    <marker id="notify"></marker>
   </section>
 
   <section>
-    <marker id="notify"></marker>
     <title>Notify Definitions</title>
     <p>The information about Notify Definitions should be stored in a
-      file called
-      <c>notify.conf</c>.
-      </p>
+    file called <c>notify.conf</c>. </p>
     <p>The corresponding table is <c>snmpNotifyTable</c> in the
-      SNMP-NOTIFICATION-MIB.
-      </p>
-    <p>Each entry is a term:
-      </p>
+    SNMP-NOTIFICATION-MIB.</p>
+    <p>Each entry is a term:</p>
     <p><c>{NotifyName, Tag, Type}.</c></p>
     <list type="bulleted">
       <item>
-        <p><c>NotifyName</c> is a unique non-empty string.
-          </p>
+        <p><c>NotifyName</c> is a unique non-empty string.</p>
       </item>
       <item>
-        <p><c>Tag</c> is a string.
-          </p>
+        <p><c>Tag</c> is a string.</p>
       </item>
       <item>
-        <p><c>Type</c> is <c>trap</c> or <c>inform</c>.
-          </p>
+        <p><c>Type</c> is <c>trap</c> or <c>inform</c>.</p>
       </item>
     </list>
+
+    <marker id="target_addr"></marker>
   </section>
 
   <section>
-    <marker id="target_addr"></marker>
     <title>Target Address Definitions</title>
     <p>The information about Target Address Definitions should be 
-      stored in a file called <c>target_addr.conf</c>. </p>
+    stored in a file called <c>target_addr.conf</c>. </p>
     <p>The corresponding tables are <c>snmpTargetAddrTable</c> in the
-      SNMP-TARGET-MIB and <c>snmpTargetAddrExtTable</c> in the 
-      SNMP-COMMUNITY-MIB. </p>
+    SNMP-TARGET-MIB and <c>snmpTargetAddrExtTable</c> in the 
+    SNMP-COMMUNITY-MIB. </p>
     <p>Each entry is a term: </p>
     <p><c>{TargetName, Ip, Udp, Timeout, RetryCount, TagList, ParamsName, EngineId}.</c> <br></br> or <br></br> 
 <c>{TargetName, Ip, Udp, Timeout, RetryCount, TagList, ParamsName, EngineId, TMask, MaxMessageSize}.</c> <br></br> or  <br></br>
-<c>{TargetName, Domain, Ip, Udp, Timeout, RetryCount, TagList, ParamsName, EngineId, TMask, MaxMessageSize}.</c></p>
+<c>{TargetName, Domain, Ip, Udp, Timeout, RetryCount, TagList, ParamsName, EngineId, TMask, MaxMessageSize}.</c> </p>
     <list type="bulleted">
       <item>
-        <p><c>TargetName</c> is a unique non-empty string.
-          </p>
+        <p><c>TargetName</c> is a unique non-empty string. </p>
       </item>
       <item>
         <p><c>Domain</c> is one of the atoms: 
@@ -414,40 +403,37 @@
       </item>
     </list>
     <p>Note that if <c>EngineId</c> has the value <c>discovery</c>, 
-      the agent cannot send
-      <c>inform</c> messages to that manager until it has performed the
-      <em>discovery</em> process with that manager. </p>
+    the agent cannot send
+    <c>inform</c> messages to that manager until it has performed the
+    <em>discovery</em> process with that manager. </p>
+    
+    <marker id="target_params"></marker>
   </section>
 
   <section>
-    <marker id="target_params"></marker>
     <title>Target Parameters Definitions</title>
     <p>The information about Target Parameters Definitions should be
-      stored in a file called <c>target_params.conf</c>. </p>
+    stored in a file called <c>target_params.conf</c>. </p>
     <p>The corresponding table is <c>snmpTargetParamsTable</c> in the
-      SNMP-TARGET-MIB. </p>
+    SNMP-TARGET-MIB. </p>
     <p>Each entry is a term: </p>
     <p><c>{ParamsName, MPModel, SecurityModel, SecurityName, SecurityLevel}.</c></p>
     <list type="bulleted">
       <item>
-        <p><c>ParamsName</c> is a unique non-empty string.
-          </p>
+        <p><c>ParamsName</c> is a unique non-empty string. </p>
       </item>
       <item>
         <p><c>MPModel</c> is <c>v1</c>, <c>v2c</c> or <c>v3</c></p>
       </item>
       <item>
-        <p><c>SecurityModel</c> is <c>v1</c>, <c>v2c</c>, or <c>usm</c>.
-          </p>
+        <p><c>SecurityModel</c> is <c>v1</c>, <c>v2c</c>, or <c>usm</c>.</p>
       </item>
       <item>
-        <p><c>SecurityName</c> is a string.
-          </p>
+        <p><c>SecurityName</c> is a string.</p>
       </item>
       <item>
         <p><c>SecurityLevel</c> is <c>noAuthNoPriv</c>, <c>authNoPriv</c>
-          or <c>authPriv</c>.
-          </p>
+	or <c>authPriv</c>. </p>
       </item>
     </list>
   </section>
diff --git a/lib/snmp/src/agent/snmp_view_based_acm_mib.erl b/lib/snmp/src/agent/snmp_view_based_acm_mib.erl
index ad9540e886..c0177b1cea 100644
--- a/lib/snmp/src/agent/snmp_view_based_acm_mib.erl
+++ b/lib/snmp/src/agent/snmp_view_based_acm_mib.erl
@@ -1,7 +1,7 @@
 %% 
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1999-2012. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2013. All Rights Reserved.
 %% 
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -49,6 +49,14 @@
 -endif.
 
 
+-type internal_view_mask()         :: null | [internal_view_mask_element()].
+-type internal_view_mask_element() :: 0 | 1.
+
+-type external_view_mask() :: octet_string(). % At most length of 16 octet
+-type octet_string()       :: [octet()].
+-type octet()              :: byte().
+
+
 %%-----------------------------------------------------------------
 %% Func: configure/1
 %% Args: Dir is the directory where the configuration files are found.
@@ -160,14 +168,7 @@ check_vacm({vacmViewTreeFamily, ViewName, Tree, Type, Mask}) ->
     {ok, TypeVal} =
         snmp_conf:check_atom(Type, [{included, ?view_included},
 				    {excluded, ?view_excluded}]),
-    MaskVal = 
-        case (catch snmp_conf:check_atom(Mask, [{null, []}])) of
-            {error, _}  -> 
-                snmp_conf:check_oid(Mask),
-                Mask;
-	    {ok, X} ->
-		X
-	end,
+    {ok, MaskVal} = snmp_conf:check_imask(Mask), 
     Vacm = {ViewName, Tree, MaskVal, TypeVal, 
 	    ?'StorageType_nonVolatile', ?'RowStatus_active'},
     {ok, {vacmViewTreeFamily, Vacm}};
@@ -194,8 +195,8 @@ init_tabs(Sec2Group, Access, View) ->
     ok.
     
 init_sec2group_table([Row | T]) ->
-%%      ?vtrace("init security-to-group table: "
-%%  	    "~n   Row: ~p",[Row]),    
+    %% ?vtrace("init security-to-group table: "
+    %%         "~n   Row: ~p",[Row]),    
     Key1 = element(1, Row),
     Key2 = element(2, Row),
     Key = [Key1, length(Key2) | Key2],
@@ -953,13 +954,23 @@ verify_vacmViewTreeFamilyTable_col(?vacmViewTreeFamilySubtree, Tree) ->
 	    wrongValue(?vacmViewTreeFamilySubtree)
     end;
 verify_vacmViewTreeFamilyTable_col(?vacmViewTreeFamilyMask, Mask) ->
+    %% Mask here is in the "external" format. That is, according 
+    %% to the MIB, which means that its an OCTET STRING of max 16 
+    %% octets. 
+    %% We however store the mask as a list of 1's (exact) and 
+    %% 0's (wildcard), which means we have to convert the mask. 
     case Mask of
-	null -> [];
-	[]   -> [];
+	%% The Mask can only have this value if the vacmViewTreeFamilyTable
+	%% is called locally!
+	null -> 
+	    []; 
+	[] -> 
+	    [];
 	_ ->
-	    case (catch snmp_conf:check_oid(Mask)) of
-		ok ->
-		    Mask;
+	    %% Check and convert to our internal format
+	    case check_mask(Mask) of
+		{ok, IMask} ->
+		    IMask;
 	        _ ->
 		    wrongValue(?vacmViewTreeFamilyMask)
 	    end
@@ -977,6 +988,60 @@ verify_vacmViewTreeFamilyTable_col(_, Val) ->
     Val.
 	    
 
+check_mask(Mask) when is_list(Mask) andalso (length(Mask) =< 16) ->
+    try
+	begin
+	    {ok, emask2imask(Mask)}
+	end
+    catch
+	throw:{error, _} ->
+	    {error, {bad_mask, Mask}};
+	T:E ->
+	    {error, {bad_mask, Mask, T, E}}
+    end;
+check_mask(BadMask) ->
+    {error, {bad_mask, BadMask}}.
+
+-spec emask2imask(EMask :: external_view_mask()) ->
+    IMask :: internal_view_mask().
+
+%% Convert an External Mask (OCTET STRING) to Internal Mask (list of 0 or 1)
+emask2imask(EMask) ->
+    lists:flatten([octet2bits(Octet) || Octet <- EMask]).
+
+octet2bits(Octet) 
+  when is_integer(Octet) andalso (Octet >= 16#00) andalso (16#FF >= Octet) ->
+    <<A:1, B:1, C:1, D:1, E:1, F:1, G:1, H:1>> = <<Octet>>,
+    [A, B, C, D, E, F, G, H];
+octet2bits(BadOctet) ->
+    throw({error, {bad_octet, BadOctet}}).
+
+-spec imask2emask(IMask :: internal_view_mask()) ->
+    EMask :: external_view_mask().
+
+%% Convert an Internal Mask (list of 0 or 1) to External Mask (OCTET STRING) 
+imask2emask(IMask) ->
+    imask2emask(IMask, []).
+
+imask2emask([], EMask) ->
+    lists:reverse(EMask);
+imask2emask(IMask, EMask) ->
+    %% Make sure we have atleast 8 bits
+    %% (maybe extend with 1's)
+    IMask2 = 
+	case length(IMask) of
+	    Small when Small < 8 ->
+		IMask ++ lists:duplicate(8-Small, 1);
+	    _ ->
+		IMask
+	end, 
+    %% Extract 8 bits
+    [A, B, C, D, E, F, G, H | IMaskRest] = IMask2,
+    <<Octet:8>> = <<A:1, B:1, C:1, D:1, E:1, F:1, G:1, H:1>>,
+    imask2emask(IMaskRest, [Octet | EMask]). 
+
+
+
 table_next(Name, RestOid) ->
     snmp_generic:table_next(db(Name), RestOid).
 
@@ -1014,11 +1079,41 @@ stc(vacmSecurityToGroupTable) -> ?vacmSecurityToGroupStorageType;
 stc(vacmViewTreeFamilyTable) -> ?vacmViewTreeFamilyStorageType.
  
 next(Name, RowIndex, Cols) ->
-    snmp_generic:handle_table_next(db(Name), RowIndex, Cols,
-                                   fa(Name), foi(Name), noc(Name)).
+    Result = snmp_generic:handle_table_next(db(Name), RowIndex, Cols,
+					    fa(Name), foi(Name), noc(Name)),
+    externalize_next(Name, Result).
  
 get(Name, RowIndex, Cols) ->
-    snmp_generic:handle_table_get(db(Name), RowIndex, Cols, foi(Name)).
+    Result = snmp_generic:handle_table_get(db(Name), RowIndex, Cols, 
+					   foi(Name)),
+    externalize_get(Name, Cols, Result).
+
+
+externalize_next(Name, Result) when is_list(Result) ->
+    F = fun({[Col | _] = Idx, Val}) -> {Idx, externalize(Name, Col, Val)};
+	   (Other)                  -> Other
+	end,
+    [F(R) || R <- Result];
+externalize_next(_, Result) ->
+    Result.
+
+
+externalize_get(Name, Cols, Result) when is_list(Result) ->
+    %% Patch returned values
+    F = fun({Col, {value, Val}}) -> {value, externalize(Name, Col, Val)};
+	   ({_, Other}) ->          Other
+	end,
+    %% Merge column numbers and return values. there must be as much
+    %% return values as there are columns requested. And then patch all values
+    [F(R) || R <- lists:zip(Cols, Result)];
+externalize_get(_, _, Result) ->
+    Result. 
+
+externalize(vacmViewTreeFamilyTable, ?vacmViewTreeFamilyMask, Val) ->
+    imask2emask(Val);
+externalize(_, _, Val) ->
+    Val. 
+
 
 wrongValue(V) -> throw({wrongValue, V}).
 
diff --git a/lib/snmp/src/agent/snmpa_local_db.erl b/lib/snmp/src/agent/snmpa_local_db.erl
index 2c0cad807a..5198c6ec4e 100644
--- a/lib/snmp/src/agent/snmpa_local_db.erl
+++ b/lib/snmp/src/agent/snmpa_local_db.erl
@@ -583,7 +583,7 @@ handle_cast({variable_inc, Name, Db, N}, State) ->
 	    {value, Val} -> Val;
 	    _ -> 0 
 	end,
-    insert(Db, Name, M+N rem 4294967296, State),
+    insert(Db, Name, (M+N) rem 4294967296, State),
     {noreply, State};
     
 handle_cast({verbosity,Verbosity}, State) ->
diff --git a/lib/snmp/src/app/snmp.appup.src b/lib/snmp/src/app/snmp.appup.src
index 7ffa4a725d..16b626111b 100644
--- a/lib/snmp/src/app/snmp.appup.src
+++ b/lib/snmp/src/app/snmp.appup.src
@@ -17,18 +17,44 @@
 %% %CopyrightEnd%
 %%
 
+
 {"%VSN%",
 
 %% ----- U p g r a d e -------------------------------------------------------
 
+%% Instruction examples: 
+%% {restart_application, snmp}
+%% {load_module, snmp_pdus, soft_purge, soft_purge, []}
+%% {update, snmpa_local_db, soft, soft_purge, soft_purge, []}
+%% {add_module,  snmpm_net_if_mt}
+
  [
+  {"4.24", 
+   [
+    {load_module, snmp_conf,               soft_purge, soft_purge, []}, 
+    {load_module, snmp_view_based_acm_mib, soft_purge, soft_purge, 
+     [snmp_conf]}, 
+    {update, snmpa_local_db, soft, soft_purge, soft_purge, []}
+   ]
+  }, 
   {"4.23.1", [{restart_application, snmp}]}, 
   {"4.23",   [{restart_application, snmp}]}
  ], 
 
 %% ------D o w n g r a d e ---------------------------------------------------
 
+%% Instruction examples: 
+%% {remove, {snmpm_net_if_mt, soft_purge, soft_purge}}
+
  [
+  {"4.24", 
+   [
+    {load_module, snmp_conf,               soft_purge, soft_purge, []}, 
+    {load_module, snmp_view_based_acm_mib, soft_purge, soft_purge, 
+     [snmp_conf]}, 
+    {update, snmpa_local_db, soft, soft_purge, soft_purge, []}
+   ]
+  }, 
   {"4.23.1", [{restart_application, snmp}]}, 
   {"4.23",   [{restart_application, snmp}]}
  ]
diff --git a/lib/snmp/src/misc/snmp_conf.erl b/lib/snmp/src/misc/snmp_conf.erl
index e1e7fab57b..46625989d5 100644
--- a/lib/snmp/src/misc/snmp_conf.erl
+++ b/lib/snmp/src/misc/snmp_conf.erl
@@ -1,7 +1,7 @@
 %% 
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1996-2012. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2013. All Rights Reserved.
 %% 
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -50,6 +50,7 @@
 	 check_packet_size/1, 
 
 	 check_oid/1,
+	 check_imask/1, check_emask/1, 
 	 
 	 check_mp_model/1, 
 	 check_sec_model/1, check_sec_model/2, check_sec_model/3, 
@@ -488,6 +489,7 @@ do_check_timer(WaitFor, Factor, Incr, Retry) ->
     check_integer(Retry,   {gte, 0}),
     ok.
 
+
 %% ---------
 
 all_domains() ->
@@ -618,6 +620,37 @@ check_oid(X) ->
 
 %% ---------
 
+%% Check a (view) mask in the internal form (all 0 and 1): 
+check_imask(null) ->
+    {ok, []};
+check_imask(IMask) when is_list(IMask) ->
+    do_check_imask(IMask), 
+    {ok, IMask}.
+
+do_check_imask([0|IMask]) ->
+    do_check_imask(IMask);
+do_check_imask([1|IMask]) ->
+    do_check_imask(IMask);
+do_check_imask([X|_]) ->
+    error({invalid_internal_mask_element, X}).
+
+
+%% Check a (view) mask in the external form (according to MIB, 
+%% an OCTET STRING of at most length 16). 
+check_emask(EMask) when is_list(EMask) andalso (length(EMask) =< 16) ->
+    do_check_emask(EMask).
+
+do_check_emask([]) ->
+    ok;
+do_check_emask([X|EMask]) 
+  when is_integer(X) andalso (X >= 16#00) andalso (X =< 16#FF) ->
+    do_check_emask(EMask);
+do_check_emask([X|_]) ->
+    error({invalid_external_mask_element, X}).
+
+
+%% ---------
+
 all_integer([H|T]) when is_integer(H) -> all_integer(T);
 all_integer([_H|_T]) -> false;
 all_integer([]) -> true.
diff --git a/lib/snmp/vsn.mk b/lib/snmp/vsn.mk
index 0e48e7ea56..e987649e11 100644
--- a/lib/snmp/vsn.mk
+++ b/lib/snmp/vsn.mk
@@ -18,6 +18,6 @@
 # %CopyrightEnd%
 
 APPLICATION = snmp
-SNMP_VSN    = 4.24
+SNMP_VSN    = 4.24.1
 PRE_VSN     =
 APP_VSN     = "$(APPLICATION)-$(SNMP_VSN)$(PRE_VSN)"