type subheader =
| Id_and_seq of Cstruct.uint16 * Cstruct.uint16 |
| Next_hop_mtu of Cstruct.uint16 |
| Pointer of Cstruct.uint8 |
| Address of Ipaddr.V4.t |
| Unused |
val pp : Stdlib.Format.formatter -> t -> unit
module Unmarshal : sig ... end
module Marshal : sig ... end