Give the sockbuf structure its own header file and supporting source file.
Move all sockbuf-specific functions from kern/uipc_socket2.c into the new
kern/uipc_sockbuf.c and move all the sockbuf-speci

Give the sockbuf structure its own header file and supporting source file.
Move all sockbuf-specific functions from kern/uipc_socket2.c into the new
kern/uipc_sockbuf.c and move all the sockbuf-specific structures from
sys/socketvar.h to sys/sockbuf.h.

Change the sockbuf structure to only contain those fields required to
properly management a chain of mbufs. Create a signalsockbuf structure
to hold the remaining fields (e.g. selinfo, mbmax, etc).

Change the so_rcv and so_snd structures in the struct socket from
a sockbuf to a signalsockbuf.

Remove the recently added sorecv_direct structure which was being used
to provide a direct mbuf path to consumers for socket I/O. Use the newly
revamped sockbuf base structure instead. This gives mbuf consumers
direct access to the sockbuf API functions for use outside of a struct
socket. This will also allow new API functions to be added to the sockbuf
interface to ease the job of parsing data out of chained mbufs.

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Remove weird license clause which has expired.

Rename printf -> kprintf in sys/ and add some defines where necessary
(files which are used in userland, too).

* Remove (void) casts for discarded return values.

* Put function types on separate lines.

* Ansify function definitions.

* Remove __P.

In-collaboration-with: Alexey Slynko <slynko@tronet.ru>

Take into account the number of SACKed bytes skipped when slow-starting
in order to send out a full congestion window's worth of packets.

Reported by and tested by: Noritoshi Demizu <demizu@dd.iij4u

Take into account the number of SACKed bytes skipped when slow-starting
in order to send out a full congestion window's worth of packets.

Reported by and tested by: Noritoshi Demizu <demizu@dd.iij4u.or.jp>

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Implement SACK.