Data.IP.RouteTable

IP routing table is a tree of IPRange to search one of them on the longest match base. It is a kind of TRIE with one way branching removed. Both IPv4 and IPv6 are supported.

For more information, see: http://www.mew.org/~kazu/proj/iproute/

Documentation

Routable class

class Addr a => Routable a where

A class to contain IPv4 and IPv6.

Methods

intToTBit :: Int -> a

The intToTBit function takes Int and returns an Routable address whose only n-th bit is set.

isZero :: a -> a -> Bool

The isZero function takes an Routable address and an test bit Routable address and returns True is the bit is unset, otherwise returns False.

Instances

Routable IPv6

Routable IPv4

Type for IP routing table

data IPRTable k a

The Tree structure for IP routing table based on TRIE with one way branching removed. This is an abstract data type, so you cannot touch its inside. Please use insert or lookup, instead.

Instances

Functor (IPRTable k)

(Eq k, Eq a) => Eq (IPRTable k a)

(Show k, Show a) => Show (IPRTable k a)

Functions to manipulate an IP routing table

empty :: Routable k => IPRTable k a

The empty function returns an empty IP routing table.

>>> (empty :: IPRTable IPv4 ()) == fromList []
True

insert :: Routable k => AddrRange k -> a -> IPRTable k a -> IPRTable k a

The insert function inserts a value with a key of AddrRange to IPRTable and returns a new IPRTable.

>>> (insert ("127.0.0.1" :: AddrRange IPv4) () empty) == fromList [("127.0.0.1",())]
True

delete :: Routable k => AddrRange k -> IPRTable k a -> IPRTable k a

The delete function deletes a value by a key of AddrRange from IPRTable and returns a new IPRTable.

>>> delete "127.0.0.1" (insert "127.0.0.1" () empty) == (empty :: IPRTable IPv4 ())
True

lookup :: Routable k => AddrRange k -> IPRTable k a -> Maybe a

The lookup function looks up IPRTable with a key of AddrRange. If a routing information in IPRTable matches the key, its value is returned.

>>> let v4 = ["133.4.0.0/16","133.5.0.0/16","133.5.16.0/24","133.5.23.0/24"] :: [AddrRange IPv4]
>>> let rt = fromList $ zip v4 v4
>>> lookup "127.0.0.1" rt
Nothing
>>> lookup "133.3.0.1" rt
Nothing
>>> lookup "133.4.0.0" rt
Just 133.4.0.0/16
>>> lookup "133.4.0.1" rt
Just 133.4.0.0/16
>>> lookup "133.5.16.0" rt
Just 133.5.16.0/24
>>> lookup "133.5.16.1" rt
Just 133.5.16.0/24

findMatch :: MonadPlus m => Routable k => AddrRange k -> IPRTable k a -> m (AddrRange k, a)

The findMatch function looks up IPRTable with a key of AddrRange. If the key matches routing informations in IPRTable, they are returned.

>>> let v4 = ["133.4.0.0/16","133.5.0.0/16","133.5.16.0/24","133.5.23.0/24"] :: [AddrRange IPv4]
>>> let rt = fromList $ zip v4 $ repeat ()
>>> findMatch "133.4.0.0/15" rt :: [(AddrRange IPv4,())]
[(133.4.0.0/16,()),(133.5.0.0/16,()),(133.5.16.0/24,()),(133.5.23.0/24,())]

fromList :: Routable k => [(AddrRange k, a)] -> IPRTable k a

The fromList function creates a new IP routing table from a list of a pair of IPrange and value.

toList :: Routable k => IPRTable k a -> [(AddrRange k, a)]

The toList function creates a list of a pair of AddrRange and value from an IP routing table.