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-.TH IPPOOL 5
-.SH NAME
-ippool, ippool.conf \- IP Pool file format
-.SH DESCRIPTION
-The format for files accepted by ippool is described by the following grammar:
-.LP
-.nf
-line ::= table | groupmap .
-table ::= "table" role tabletype .
-groupmap ::= "group-map" inout role number ipfgroup
-tabletype ::= ipftree | ipfhash .
-
-role ::= "role" "=" "ipf" .
-inout ::= "in" | "out" .
-
-ipftree ::= "type" "=" "tree" number "{" addrlist "}" .
-ipfhash ::= "type" "=" "hash" number hashopts "{" hashlist "}" .
-
-ipfgroup ::= setgroup hashopts "{" grouplist "}" |
-             hashopts "{" setgrouplist "}" .
-setgroup ::= "group" "=" groupname .
-
-hashopts ::= size [ seed ] | seed .
-
-size ::= "size" number .
-seed ::= "seed" number .
-
-addrlist ::= [ "!" ] addrmask ";" [ addrlist ] .
-grouplist ::= groupentry ";" [ grouplist ] | addrmask ";" [ grouplist ] .
-
-setgrouplist ::= groupentry ";" [ setgrouplist ] .
-
-groupentry ::= addrmask "," setgroup .
-
-hashlist ::= hashentry ";" [ hashlist ] .
-hashentry ::= addrmask .
-
-addrmask ::= ipaddr | ipaddr "/" mask .
-
-mask ::= number | ipaddr .
-
-groupname ::= number | name .
-
-number ::= digit { digit } .
-
-ipaddr  = host-num "." host-num "." host-num "." host-num .
-host-num = digit [ digit [ digit ] ] .
-
-digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" .
-name ::= letter { letter | digit } .
-.fi
-.PP
-The IP pool configuration file is used for defining a single object that
-contains a reference to multiple IP address/netmask pairs.  A pool may consist
-of a mixture of netmask sizes, from 0 to 32.
-.PP
-At this point in time, only IPv4 addressing is supported.
-.TP
-.SH OVERVIEW
-.PP
-The IP pool configuration file provides for defining two different mechanisms
-for improving speed in matching IP addresses with rules.
-The first,
-.B table
-, defines a lookup
-.I table
-to provide a single reference in a
-filter rule to multiple targets and the second,
-.B group-map
-, provides a mechanism to target multiple groups from a single filter line.
-.PP
-The
-.B group-map
-command can only be used with filter rules that use the
-.B call
-command to invoke either
-.B fr_srcgrpmap
-or
-.B fr_dstgrpmap
-, to use the source or destination address,
-respectively, for determining which filter group to jump to next for
-continuation of filter packet processing.
-.SH POOL TYPES
-.PP
-Two storage formats are provided: hash tables and tree structure.  The hash
-table is intended for use with objects all containing the same netmask or a
-few different sized netmasks of non-overlapping address space and the tree
-is designed for being able to support exceptions to a covering mask, in
-addition to normal searching as you would do with a table.  It is not possible
-to use the tree data storage type with
-.B group-map
-configuration entries.
-.SH POOL ROLES
-.PP
-When a pool is defined in the configuration file, it must have an associated
-role.  At present the only supported role is
-.B ipf.
-Future development will see futher expansion of their use by other sections
-of IPFilter code.
-.SH EXAMPLES
-The following examples show how the pool configuration file is used with
-the ipf configuration file to enhance the ability for the ipf configuration
-file to be succinct in meaning.
-.TP
-1
-The first example shows how a filter rule makes reference to a specific
-pool for matching of the source address.
-.nf
-pass in from pool/100 to any
-.fi
-.PP
-The pool configuration, which matches IP addresses 1.1.1.1 and any
-in 2.2.0.0/16, except for those in 2.2.2.0/24.
-.PP
-.nf
-table role = ipf type = tree number = 100
-        { 1.1.1.1/32; 2.2.0.0/16; !2.2.2.0/24 };
-.fi
-.TP
-2
-The following ipf.conf extract uses the
-fr_srcgrpmap/fr_dstgrpmap lookups to use the
-.B group-map
-facility to lookup the next group to use for filter processing, providing
-the
-.B call
-filter rule is matched.
-.nf
-call now fr_srcgrpmap/1010 in all
-call now fr_dstgrpmap/2010 out all
-pass in all group 1020
-block in all group 1030
-pass out all group 2020
-block out all group 2040
-.fi
-.PP
-A ippool configuration to work with the above ipf.conf file might
-look like this:
-.PP
-.nf
-group-map in role = ipf number = 1010
-	{ 1.1.1.1/32, group = 1020; 3.3.0.0/16, group = 1030; };
-group-map out role = ipf number = 2010 group = 2020
-	{ 2.2.2.2/32; 4.4.0.0/16; 5.0.0.0/8, group = 2040; };
-.fi
-.SH FILES
-/dev/iplookup
-.br
-/etc/ippool.conf
-.br
-/etc/hosts
-.SH SEE ALSO
-ippool(8), hosts(5), ipf(5), ipf(8), ipnat(8)