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       policy - Shorewall policy file




       This file defines the high-level policy for connections between zones
       defined in shorewall-zones[1](5).

           The order of entries in this file is important

           This file determines what to do with a new connection request if we
           don't get a match from the /etc/shorewall/rules file . For each
           source/destination pair, the file is processed in order until a
           match is found ("all" will match any client or server).

           Intra-zone policies are pre-defined

           For $FW and for all of the zones defined in /etc/shorewall/zones,
           the POLICY for connections from the zone to itself is ACCEPT (with
           no logging or TCP connection rate limiting) but may be overridden
           by an entry in this file. The overriding entry must be explicit
           (cannot use "all" in the SOURCE or DEST).

           Similarly, if you have IMPLICIT_CONTINUE=Yes in shorewall.conf,
           then the implicit policy to/from any sub-zone is CONTINUE. These
           implicit CONTINUE policies may also be overridden by an explicit
           entry in this file.

       The columns in the file are as follows.

       SOURCE - zone|$FW|all
           Source zone. Must be the name of a zone defined in
           shorewall-zones[1](5), $FW or "all".

       DEST - zone|$FW|all
           Destination zone. Must be the name of a zone defined in
           shorewall-zones[1](5), $FW or "all". If the DEST is a bport zone,
           then the SOURCE must be "all", another bport zone associated with
           the same bridge, or it must be an ipv4 zone that is associated with
           only the same bridge.

       POLICY -
           Policy if no match from the rules file is found.

           If the policy is neither CONTINUE nor NONE then the policy may be
           followed by ":" and one of the following:

            1. The word "None" or "none". This causes any default action
               defined in shorewall.conf[2](5) to be omitted for this policy.

            2. The name of an action (requires that USE_ACTIONS=Yes in
               shorewall.conf[2](5)). That action will be invoked before the
               policy is enforced.

            3. The name of a macro. The rules in that macro will be applied
               before the policy is enforced. This does not require

           Possible policies are:

               Accept the connection.

               Ignore the connection request.

               For TCP, send RST. For all other, send an "unreachable" ICMP.

               Queue the request for a user-space application such as

               Queue the request for a user-space application using the
               nfnetlink_queue mechanism. If a queuenumber is not given, queue
               zero (0) is assumed.

               Pass the connection request past any other rules that it might
               also match (where the source or destination zone in those rules
               is a superset of the SOURCE or DEST in this policy). See
               shorewall-nesting[3](5) for additional information.

               Assume that there will never be any packets from this SOURCE to
               this DEST. Shorewall will not create any infrastructure to
               handle such packets and you may not have any rules with this
               SOURCE and DEST in the /etc/shorewall/rules file. If such a
               packet is received, the result is undefined. NONE may not be
               used if the SOURCE or DEST columns contain the firewall zone
               ($FW) or "all".

       LOG LEVEL (Optional) - [log-level|ULOG|NFLOG]
           If supplied, each connection handled under the default POLICY is
           logged at that level. If not supplied, no log message is generated.
           See syslog.conf(5) for a description of log levels.

           You may also specify ULOG or NFLOG (must be in upper case). This
           will log to the ULOG or NFLOG target and will send to a separate
           log through use of ulogd

           If you don't want to log but need to specify the following column,
           place "-" here.

       BURST:LIMIT - [{s|d}:[[name]:]]]rate/{second|minute}[:burst]
           If passed, specifies the maximum TCP connection rate and the size
           of an acceptable burst. If not specified, TCP connections are not
           limited. If the burst parameter is omitted, a value of 5 is

           When s: or d: is specified, the rate applies per source IP address
           or per destination IP address respectively. The name may be chosen
           by the user and specifies a hash table to be used to count matching
           connections. If not give, the name shorewall is assumed. Where more
           than one POLICY specifies the same name, the connections counts for
           the policies are aggregated and the individual rates apply to the
           aggregated count.

       CONNLIMIT - limit[:mask]
           May be used to limit the number of simultaneous connections from
           each individual host to limit connections. While the limit is only
           checked on connections to which this policy could apply, the number
           of current connections is calculated over all current connections
           from the SOURCE host. By default, the limit is applied to each host
           individually but can be made to apply to networks of hosts by
           specifying a mask. The mask specifies the width of a VLSM mask to
           be applied to the source address; the number of current connections
           is then taken over all hosts in the subnet source-address/mask.


        1. All connections from the local network to the internet are allowed

        2. All connections from the internet are ignored but logged at syslog
           level KERNEL.INFO.

        3. All other connection requests are rejected and logged at level

                   #SOURCE         DEST            POLICY          LOG           BURST:LIMIT
                   #                                               LEVEL
                   loc             net             ACCEPT
                   net             all             DROP            info
                   all             all             REJECT          info




       shorewall(8), shorewall-accounting(5), shorewall-actions(5),
       shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5),
       shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5),
       shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
       shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5),
       shorewall-route_rules(5), shorewall-routestopped(5),
       shorewall-rules(5), shorewall.conf(5), shorewall-tcclasses(5),
       shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5),
       shorewall-tunnels(5), shorewall-zones(5)


        1. shorewall-zones

        2. shorewall.conf

        3. shorewall-nesting

[FIXME: source]                   06/17/2010