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diff --git a/c/src/lib/libnetworking/sys/protosw.h b/c/src/lib/libnetworking/sys/protosw.h
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+++ b/c/src/lib/libnetworking/sys/protosw.h
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+/*-
+ * Copyright (c) 1982, 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.
+ *
+ *	@(#)protosw.h	8.1 (Berkeley) 6/2/93
+ * $Id$
+ */
+
+#ifndef _SYS_PROTOSW_H_
+#define _SYS_PROTOSW_H_
+
+struct ifnet;
+struct mbuf;
+struct sockaddr;
+struct socket;
+struct sockproto;
+struct stat;
+
+/*
+ * Protocol switch table.
+ *
+ * Each protocol has a handle initializing one of these structures,
+ * which is used for protocol-protocol and system-protocol communication.
+ *
+ * A protocol is called through the pr_init entry before any other.
+ * Thereafter it is called every 200ms through the pr_fasttimo entry and
+ * every 500ms through the pr_slowtimo for timer based actions.
+ * The system will call the pr_drain entry if it is low on space and
+ * this should throw away any non-critical data.
+ *
+ * Protocols pass data between themselves as chains of mbufs using
+ * the pr_input and pr_output hooks.  Pr_input passes data up (towards
+ * UNIX) and pr_output passes it down (towards the imps); control
+ * information passes up and down on pr_ctlinput and pr_ctloutput.
+ * The protocol is responsible for the space occupied by any the
+ * arguments to these entries and must dispose it.
+ *
+ * The userreq routine interfaces protocols to the system and is
+ * described below.
+ */
+struct protosw {
+	short	pr_type;		/* socket type used for */
+	struct	domain *pr_domain;	/* domain protocol a member of */
+	short	pr_protocol;		/* protocol number */
+	short	pr_flags;		/* see below */
+/* protocol-protocol hooks */
+	void	(*pr_input) __P((struct mbuf *, int len));
+					/* input to protocol (from below) */
+	int	(*pr_output)	__P((struct mbuf *m, struct socket *so));
+					/* output to protocol (from above) */
+	void	(*pr_ctlinput)__P((int, struct sockaddr *, void *));
+					/* control input (from below) */
+	int	(*pr_ctloutput)__P((int, struct socket *, int, int,
+				    struct mbuf **));
+					/* control output (from above) */
+/* user-protocol hook */
+	int	(*pr_ousrreq) __P((struct socket *, int, struct mbuf *,
+				   struct mbuf *, struct mbuf *));
+					/* user request: see list below */
+/* utility hooks */
+	void	(*pr_init) __P((void));	/* initialization hook */
+	void	(*pr_fasttimo) __P((void));
+					/* fast timeout (200ms) */
+	void	(*pr_slowtimo) __P((void));
+					/* slow timeout (500ms) */
+	void	(*pr_drain) __P((void));
+					/* flush any excess space possible */
+	struct	pr_usrreqs *pr_usrreqs;	/* supersedes pr_usrreq() */
+};
+
+#define	PR_SLOWHZ	2		/* 2 slow timeouts per second */
+#define	PR_FASTHZ	5		/* 5 fast timeouts per second */
+
+/*
+ * Values for pr_flags.
+ * PR_ADDR requires PR_ATOMIC;
+ * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
+ * PR_IMPLOPCL means that the protocol allows sendto without prior connect,
+ *	and the protocol understands the MSG_EOF flag.  The first property is
+ *	is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed
+ *	anyhow).
+ */
+#define	PR_ATOMIC	0x01		/* exchange atomic messages only */
+#define	PR_ADDR		0x02		/* addresses given with messages */
+#define	PR_CONNREQUIRED	0x04		/* connection required by protocol */
+#define	PR_WANTRCVD	0x08		/* want PRU_RCVD calls */
+#define	PR_RIGHTS	0x10		/* passes capabilities */
+#define PR_IMPLOPCL	0x20		/* implied open/close */
+
+/*
+ * The arguments to usrreq are:
+ *	(*protosw[].pr_usrreq)(up, req, m, nam, opt);
+ * where up is a (struct socket *), req is one of these requests,
+ * m is a optional mbuf chain containing a message,
+ * nam is an optional mbuf chain containing an address,
+ * and opt is a pointer to a socketopt structure or nil.
+ * The protocol is responsible for disposal of the mbuf chain m,
+ * the caller is responsible for any space held by nam and opt.
+ * A non-zero return from usrreq gives an
+ * UNIX error number which should be passed to higher level software.
+ */
+#define	PRU_ATTACH		0	/* attach protocol to up */
+#define	PRU_DETACH		1	/* detach protocol from up */
+#define	PRU_BIND		2	/* bind socket to address */
+#define	PRU_LISTEN		3	/* listen for connection */
+#define	PRU_CONNECT		4	/* establish connection to peer */
+#define	PRU_ACCEPT		5	/* accept connection from peer */
+#define	PRU_DISCONNECT		6	/* disconnect from peer */
+#define	PRU_SHUTDOWN		7	/* won't send any more data */
+#define	PRU_RCVD		8	/* have taken data; more room now */
+#define	PRU_SEND		9	/* send this data */
+#define	PRU_ABORT		10	/* abort (fast DISCONNECT, DETATCH) */
+#define	PRU_CONTROL		11	/* control operations on protocol */
+#define	PRU_SENSE		12	/* return status into m */
+#define	PRU_RCVOOB		13	/* retrieve out of band data */
+#define	PRU_SENDOOB		14	/* send out of band data */
+#define	PRU_SOCKADDR		15	/* fetch socket's address */
+#define	PRU_PEERADDR		16	/* fetch peer's address */
+#define	PRU_CONNECT2		17	/* connect two sockets */
+/* begin for protocols internal use */
+#define	PRU_FASTTIMO		18	/* 200ms timeout */
+#define	PRU_SLOWTIMO		19	/* 500ms timeout */
+#define	PRU_PROTORCV		20	/* receive from below */
+#define	PRU_PROTOSEND		21	/* send to below */
+/* end for protocol's internal use */
+#define PRU_SEND_EOF		22	/* send and close */
+#define PRU_NREQ		22
+
+#ifdef PRUREQUESTS
+char *prurequests[] = {
+	"ATTACH",	"DETACH",	"BIND",		"LISTEN",
+	"CONNECT",	"ACCEPT",	"DISCONNECT",	"SHUTDOWN",
+	"RCVD",		"SEND",		"ABORT",	"CONTROL",
+	"SENSE",	"RCVOOB",	"SENDOOB",	"SOCKADDR",
+	"PEERADDR",	"CONNECT2",	"FASTTIMO",	"SLOWTIMO",
+	"PROTORCV",	"PROTOSEND",
+	"SEND_EOF",
+};
+#endif
+
+#ifdef	KERNEL			/* users shouldn't see this decl */
+struct stat;
+struct ifnet;
+
+/*
+ * If the ordering here looks odd, that's because it's alphabetical.
+ */
+struct pr_usrreqs {
+	int	(*pru_abort) __P((struct socket *so));
+	int	(*pru_accept) __P((struct socket *so, struct mbuf *nam));
+	int	(*pru_attach) __P((struct socket *so, int proto));
+	int	(*pru_bind) __P((struct socket *so, struct mbuf *nam));
+	int	(*pru_connect) __P((struct socket *so, struct mbuf *nam));
+	int	(*pru_connect2) __P((struct socket *so1, struct socket *so2));
+	int	(*pru_control) __P((struct socket *so, int cmd, caddr_t data,
+				    struct ifnet *ifp));
+	int	(*pru_detach) __P((struct socket *so));
+	int	(*pru_disconnect) __P((struct socket *so));
+	int	(*pru_listen) __P((struct socket *so));
+	int	(*pru_peeraddr) __P((struct socket *so, struct mbuf *nam));
+	int	(*pru_rcvd) __P((struct socket *so, int flags));
+	int	(*pru_rcvoob) __P((struct socket *so, struct mbuf *m,
+				   int flags));
+	/*
+	 * The `m' parameter here is almost certainly going to become a
+	 * `struct uio' at some point in the future.  Similar changes
+	 * will probably happen for the receive entry points.
+	 */
+	int	(*pru_send) __P((struct socket *so, int flags, struct mbuf *m, 
+			      struct mbuf *addr, struct mbuf *control));
+#define	PRUS_OOB	0x1
+#define	PRUS_EOF	0x2
+	int	(*pru_sense) __P((struct socket *so, struct stat *sb));
+	int	(*pru_shutdown) __P((struct socket *so));
+	int	(*pru_sockaddr) __P((struct socket *so, struct mbuf *nam));
+};
+
+int	pru_accept_notsupp __P((struct socket *so, struct mbuf *nam));
+int	pru_connect2_notsupp __P((struct socket *so1, struct socket *so2));
+int	pru_control_notsupp __P((struct socket *so, int cmd, caddr_t data,
+				 struct ifnet *ifp));
+int	pru_listen_notsupp __P((struct socket *so));
+int	pru_rcvd_notsupp __P((struct socket *so, int flags));
+int	pru_rcvoob_notsupp __P((struct socket *so, struct mbuf *m, int flags));
+int	pru_sense_null __P((struct socket *so, struct stat *sb));
+
+#define	PRU_OLDSTYLE
+
+#ifdef PRU_OLDSTYLE
+/*
+ * Protocols which don't yet implement pr_usrreqs can point it to this
+ * structure, which will call the old pr_usrreq() entry point with the
+ * appropriate arguments.
+ */
+extern	struct pr_usrreqs pru_oldstyle;
+#endif /* PRU_OLDSTYLE */
+
+#endif /* KERNEL */
+
+/*
+ * The arguments to the ctlinput routine are
+ *	(*protosw[].pr_ctlinput)(cmd, sa, arg);
+ * where cmd is one of the commands below, sa is a pointer to a sockaddr,
+ * and arg is a `void *' argument used within a protocol family.
+ */
+#define	PRC_IFDOWN		0	/* interface transition */
+#define	PRC_ROUTEDEAD		1	/* select new route if possible ??? */
+#define	PRC_QUENCH2		3	/* DEC congestion bit says slow down */
+#define	PRC_QUENCH		4	/* some one said to slow down */
+#define	PRC_MSGSIZE		5	/* message size forced drop */
+#define	PRC_HOSTDEAD		6	/* host appears to be down */
+#define	PRC_HOSTUNREACH		7	/* deprecated (use PRC_UNREACH_HOST) */
+#define	PRC_UNREACH_NET		8	/* no route to network */
+#define	PRC_UNREACH_HOST	9	/* no route to host */
+#define	PRC_UNREACH_PROTOCOL	10	/* dst says bad protocol */
+#define	PRC_UNREACH_PORT	11	/* bad port # */
+/* was	PRC_UNREACH_NEEDFRAG	12	   (use PRC_MSGSIZE) */
+#define	PRC_UNREACH_SRCFAIL	13	/* source route failed */
+#define	PRC_REDIRECT_NET	14	/* net routing redirect */
+#define	PRC_REDIRECT_HOST	15	/* host routing redirect */
+#define	PRC_REDIRECT_TOSNET	16	/* redirect for type of service & net */
+#define	PRC_REDIRECT_TOSHOST	17	/* redirect for tos & host */
+#define	PRC_TIMXCEED_INTRANS	18	/* packet lifetime expired in transit */
+#define	PRC_TIMXCEED_REASS	19	/* lifetime expired on reass q */
+#define	PRC_PARAMPROB		20	/* header incorrect */
+
+#define	PRC_NCMDS		21
+
+#define	PRC_IS_REDIRECT(cmd)	\
+	((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
+
+#ifdef PRCREQUESTS
+char	*prcrequests[] = {
+	"IFDOWN", "ROUTEDEAD", "#2", "DEC-BIT-QUENCH2",
+	"QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
+	"NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
+	"#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
+	"TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
+	"PARAMPROB"
+};
+#endif
+
+/*
+ * The arguments to ctloutput are:
+ *	(*protosw[].pr_ctloutput)(req, so, level, optname, optval);
+ * req is one of the actions listed below, so is a (struct socket *),
+ * level is an indication of which protocol layer the option is intended.
+ * optname is a protocol dependent socket option request,
+ * optval is a pointer to a mbuf-chain pointer, for value-return results.
+ * The protocol is responsible for disposal of the mbuf chain *optval
+ * if supplied,
+ * the caller is responsible for any space held by *optval, when returned.
+ * A non-zero return from usrreq gives an
+ * UNIX error number which should be passed to higher level software.
+ */
+#define	PRCO_GETOPT	0
+#define	PRCO_SETOPT	1
+
+#define	PRCO_NCMDS	2
+
+#ifdef PRCOREQUESTS
+char	*prcorequests[] = {
+	"GETOPT", "SETOPT",
+};
+#endif
+
+#ifdef KERNEL
+struct protosw *pffindproto __P((int family, int protocol, int type));
+struct protosw *pffindtype __P((int family, int type));
+#endif
+
+#endif