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module Network.Ip (
IpPrefix(..),
textIpNetwork,
IpAddress(..),
textIpAddress,
textIpAddressCidr,
allowsSubnets,
ipSubnet,
lanSubnet,
MonadPIO(..),
NetworkNamespace,
HasNetns(..),
addNetworkNamespace,
textNetnsName,
callOn,
Link(..),
Loopback, loopback,
VEth, addVEth,
Bridge, addBridge,
addAddress,
setMaster,
linkUp, linkDown,
) where
import Control.Monad.Writer
import Data.Text (Text)
import Data.Text qualified as T
import Data.Word
import System.Process
newtype IpPrefix = IpPrefix [Word8]
deriving (Eq, Ord)
textIpNetwork :: IpPrefix -> Text
textIpNetwork (IpPrefix prefix) =
T.intercalate "." (map (T.pack . show) $ prefix ++ replicate (4 - length prefix) 0)
<> "/" <> T.pack (show (8 * length prefix))
data IpAddress = IpAddress IpPrefix Word8
deriving (Eq, Ord)
textIpAddress :: IpAddress -> Text
textIpAddress (IpAddress (IpPrefix prefix) num) =
T.intercalate "." $ map (T.pack . show) $ prefix ++ replicate (3 - length prefix) 0 ++ [num]
textIpAddressCidr :: IpAddress -> Text
textIpAddressCidr ip@(IpAddress (IpPrefix prefix) _) =
textIpAddress ip <> "/" <> T.pack (show (8 * length prefix))
allowsSubnets :: IpPrefix -> Bool
allowsSubnets (IpPrefix prefix) = length prefix < 3
ipSubnet :: Word8 -> IpPrefix -> IpPrefix
ipSubnet num (IpPrefix prefix) = IpPrefix (prefix ++ [num])
lanSubnet :: IpPrefix -> IpPrefix
lanSubnet (IpPrefix prefix) = IpPrefix (take 3 $ prefix ++ repeat 0)
class Monad m => MonadPIO m where
postpone :: IO () -> m ()
instance MonadPIO IO where
postpone = id
instance Monad m => MonadPIO (WriterT [IO ()] m) where
postpone = tell . (:[])
newtype NetworkNamespace = NetworkNamespace
{ netnsName :: Text
}
deriving (Eq, Ord)
class HasNetns a where getNetns :: a -> NetworkNamespace
instance HasNetns NetworkNamespace where getNetns = id
addNetworkNamespace :: MonadPIO m => Text -> m NetworkNamespace
addNetworkNamespace name = do
postpone $ callCommand $ T.unpack $ "ip netns add \"" <> name <> "\""
return $ NetworkNamespace
{ netnsName = name
}
textNetnsName :: NetworkNamespace -> Text
textNetnsName = netnsName
callOn :: HasNetns a => a -> Text -> IO ()
callOn n cmd = callCommand $ T.unpack $ "ip netns exec \"" <> ns <> "\" " <> cmd
where NetworkNamespace ns = getNetns n
data Link a = Link
{ linkName :: Text
, linkNetns :: NetworkNamespace
}
instance HasNetns (Link a) where getNetns = linkNetns
data Loopback
loopback :: HasNetns n => n -> Link Loopback
loopback = Link "lo" . getNetns
data VEth
addVEth :: (HasNetns n, HasNetns n', MonadPIO m) => (n, Text) -> (n', Text) -> m (Link VEth, Link VEth)
addVEth (netns, name) (netns', name') = do
postpone $ callOn netns $ "ip link add \"" <> name <> "\" type veth peer name \"" <> name' <> "\" netns \"" <> textNetnsName (getNetns netns') <> "\""
return $ (,)
(Link name $ getNetns netns )
(Link name' $ getNetns netns')
data Bridge
addBridge :: (HasNetns n, MonadPIO m) => n -> Text -> m (Link Bridge)
addBridge netns name = do
postpone $ callOn netns $ "ip link add name \"" <> name <> "\" type bridge"
return $ Link name $ getNetns netns
addAddress :: MonadPIO m => Link a -> IpAddress -> m ()
addAddress link addr@(IpAddress prefix _) = do
let bcast = IpAddress prefix 255
postpone $ callOn link $ "ip addr add " <> textIpAddressCidr addr <> " broadcast " <> textIpAddress bcast <> " dev \"" <> linkName link <> "\""
setMaster :: (MonadPIO m, MonadFail m) => Link a -> Link Bridge -> m ()
setMaster link bridge = do
when (getNetns link /= getNetns bridge) $ fail "link and bridge in different network namespaces"
postpone $ callOn link $ "ip link set dev \"" <> linkName link <> "\" master \"" <> linkName bridge <> "\""
linkUp :: MonadPIO m => Link a -> m ()
linkUp link = do
postpone $ callOn link $ "ip link set dev \"" <> linkName link <> "\" up"
linkDown :: MonadPIO m => Link a -> m ()
linkDown link = do
postpone $ callOn link $ "ip link set dev \"" <> linkName link <> "\" down"
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