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+.\" Copyright (c) 1983, 1986, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)3.t	8.1 (Berkeley) 6/8/93
+.\"
+.nr H2 1
+.\".ds RH Goals
+.br
+.ne 2i
+.NH
+\s+2Goals\s0
+.PP
+The networking system was designed with the goal of supporting
+multiple \fIprotocol families\fP and addressing styles.  This required
+information to be ``hidden'' in common data structures which
+could be manipulated by all the pieces of the system, but which
+required interpretation only by the protocols which ``controlled''
+it.  The system described here attempts to minimize
+the use of shared data structures to those kept by a suite of
+protocols (a \fIprotocol family\fP), and those used for rendezvous
+between ``synchronous'' and ``asynchronous'' portions of the
+system (e.g. queues of data packets are filled at interrupt
+time and emptied based on user requests).
+.PP
+A major goal of the system was to provide a framework within
+which new protocols and hardware could be easily be supported.
+To this end, a great deal of effort has been extended to
+create utility routines which hide many of the more
+complex and/or hardware dependent chores of networking.
+Later sections describe the utility routines and the underlying
+data structures they manipulate.