We provide the user with a set of primitives, as we will see in this
section soon. Our user space part will do most of the data manipulation defined
by the protocol, and finally will map these primitives to existing socket system
calls, which in turn will be calling the functions that we have provided in the
The Protocol Control Block for SCTP is kept in the user space, whereas
the one for Internet PCB will reside in the kernel itself. All the buffers
(retransmission queues, receive buffers) will also be a part of the user space.
The design will be analogous to the design of the TCP used in the kernel.