IPPOOL(5)IPPOOL(5)NAME
ippool, ippool.conf - IP Pool file format
DESCRIPTION
The format for files accepted by ippool is described by the following
grammar:
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 } .
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.
At this point in time, only IPv4 addressing is supported.
OVERVIEW
The IP pool configuration file provides for defining two different
mechanisms for improving speed in matching IP addresses with rules.
The first, table , defines a lookup table to provide a single reference
in a filter rule to multiple targets and the second, group-map , pro‐
vides a mechanism to target multiple groups from a single filter line.
The group-map command can only be used with filter rules that use the
call command to invoke either fr_srcgrpmap or fr_dstgrpmap , to use the
source or destination address, respectively, for determining which fil‐
ter group to jump to next for continuation of filter packet processing.
POOL TYPES
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
group-map configuration entries.
POOL ROLES
When a pool is defined in the configuration file, it must have an asso‐
ciated role. At present the only supported role is ipf. Future devel‐
opment will see futher expansion of their use by other sections of
IPFilter code.
EXAMPLES
The following examples show how the pool configuration file is used
with the ipf configuration file to enhance the ability for the ipf con‐
figuration file to be succinct in meaning.
1 The first example shows how a filter rule makes reference to a
specific pool for matching of the source address.
pass in from pool/100 to any
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.
table role = ipf type = tree number = 100
{ 1.1.1.1/32; 2.2.0.0/16; !2.2.2.0/24 };
2 The following ipf.conf extract uses the fr_srcgrpmap/fr_dst‐
grpmap lookups to use the group-map facility to lookup the next
group to use for filter processing, providing the call filter
rule is matched.
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
A ippool configuration to work with the above ipf.conf file might look
like this:
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; };
FILES
/dev/iplookup
/etc/ippool.conf
/etc/hosts
SEE ALSOippool(8), hosts(5), ipf(5), ipf(8), ipnat(8)IPPOOL(5)
