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File: [cvs.NetBSD.org] / src / sys / netinet6 / raw_ip6.c (download)

Revision 1.23, Mon May 29 00:03:18 2000 UTC (20 years, 5 months ago) by itojun
Branch: MAIN
CVS Tags: netbsd-1-5-base, netbsd-1-5-RELEASE, netbsd-1-5-BETA2, netbsd-1-5-BETA, netbsd-1-5-ALPHA2
Branch point for: netbsd-1-5
Changes since 1.22: +12 -2 lines

disallow bind(2) with IPv4 mapped address for now.  port number check is
insufficient at this moment and we can bind(2) two sockets listen on same
port number.

for real fix, we need to check inpcb table with in6pcb.  we can't
find inpcb chain from particular in6pcb chain (like finding tcbtable from tcb6)
luckily RFC2553 does not talk about bind(2) behavior for IPv4 mapped.
IPv4 mapped brings in too much complexities...

/*	$NetBSD: raw_ip6.c,v 1.23 2000/05/29 00:03:18 itojun Exp $	*/
/*	$KAME: raw_ip6.c,v 1.28 2000/05/28 23:25:07 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */

/*
 * Copyright (c) 1982, 1986, 1988, 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.
 *
 *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
 */

#include "opt_ipsec.h"

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/proc.h>

#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#include <netinet6/ip6protosw.h>

#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/

#include <machine/stdarg.h>

#include "faith.h"

struct	in6pcb rawin6pcb;
#define ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))

/*
 * Raw interface to IP6 protocol.
 */

/*
 * Initialize raw connection block queue.
 */
void
rip6_init()
{
	rawin6pcb.in6p_next = rawin6pcb.in6p_prev = &rawin6pcb;
}

/*
 * Setup generic address and protocol structures
 * for raw_input routine, then pass them along with
 * mbuf chain.
 */
int
rip6_input(mp, offp, proto)
	struct	mbuf **mp;
	int	*offp, proto;
{
	struct mbuf *m = *mp;
	register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
	register struct in6pcb *in6p;
	struct in6pcb *last = NULL;
	struct sockaddr_in6 rip6src;
	struct mbuf *opts = NULL;

#if defined(NFAITH) && 0 < NFAITH
	if (m->m_pkthdr.rcvif) {
		if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
			/* send icmp6 host unreach? */
			m_freem(m);
			return IPPROTO_DONE;
		}
	}
#endif

	/* Be proactive about malicious use of IPv4 mapped address */
	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
		/* XXX stat */
		m_freem(m);
		return IPPROTO_DONE;
	}

	bzero(&rip6src, sizeof(rip6src));
	rip6src.sin6_len = sizeof(struct sockaddr_in6);
	rip6src.sin6_family = AF_INET6;
	rip6src.sin6_addr = ip6->ip6_src;
	if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
		rip6src.sin6_addr.s6_addr16[1] = 0;
	if (m->m_pkthdr.rcvif) {
		if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
			rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
		else
			rip6src.sin6_scope_id = 0;
	} else
		rip6src.sin6_scope_id = 0;

	for (in6p = rawin6pcb.in6p_next;
	     in6p != &rawin6pcb; in6p = in6p->in6p_next) {
		if (in6p->in6p_ip6.ip6_nxt &&
		    in6p->in6p_ip6.ip6_nxt != proto)
			continue;
		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
			continue;
		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
			continue;
		if (in6p->in6p_cksum != -1
		 && in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp))
		{
			/* XXX bark something */
			continue;
		}
		if (last) {
			struct	mbuf *n;
			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
				if (last->in6p_flags & IN6P_CONTROLOPTS)
					ip6_savecontrol(last, &opts, ip6, n);
				/* strip intermediate headers */
				m_adj(n, *offp);
				if (sbappendaddr(&last->in6p_socket->so_rcv,
						(struct sockaddr *)&rip6src,
						 n, opts) == 0) {
					/* should notify about lost packet */
					m_freem(n);
					if (opts)
						m_freem(opts);
				} else
					sorwakeup(last->in6p_socket);
				opts = NULL;
			}
		}
		last = in6p;
	}
	if (last) {
		if (last->in6p_flags & IN6P_CONTROLOPTS)
			ip6_savecontrol(last, &opts, ip6, m);
		/* strip intermediate headers */
		m_adj(m, *offp);
		if (sbappendaddr(&last->in6p_socket->so_rcv,
				(struct sockaddr *)&rip6src, m, opts) == 0) {
			m_freem(m);
			if (opts)
				m_freem(opts);
		} else
			sorwakeup(last->in6p_socket);
	} else {
		if (proto == IPPROTO_NONE)
			m_freem(m);
		else {
			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
			icmp6_error(m, ICMP6_PARAM_PROB,
				    ICMP6_PARAMPROB_NEXTHEADER,
				    prvnxtp - mtod(m, char *));
		}
		ip6stat.ip6s_delivered--;
	}
	return IPPROTO_DONE;
}

void
rip6_ctlinput(cmd, sa, d)
	int cmd;
	struct sockaddr *sa;
	void *d;
{
	struct sockaddr_in6 sa6;
	register struct ip6_hdr *ip6;
	struct mbuf *m;
	int off;
	void (*notify) __P((struct in6pcb *, int)) = in6_rtchange;

	if (sa->sa_family != AF_INET6 ||
	    sa->sa_len != sizeof(struct sockaddr_in6))
		return;

	if ((unsigned)cmd >= PRC_NCMDS)
		return;
	if (PRC_IS_REDIRECT(cmd))
		notify = in6_rtchange, d = NULL;
	else if (cmd == PRC_HOSTDEAD)
		d = NULL;
	else if (inet6ctlerrmap[cmd] == 0)
		return;

	/* if the parameter is from icmp6, decode it. */
	if (d != NULL) {
		struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
		m = ip6cp->ip6c_m;
		ip6 = ip6cp->ip6c_ip6;
		off = ip6cp->ip6c_off;
	} else {
		m = NULL;
		ip6 = NULL;
	}

	/* translate addresses into internal form */
	sa6 = *(struct sockaddr_in6 *)sa;
	if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) && m && m->m_pkthdr.rcvif)
		sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);

	if (ip6) {
		/*
		 * XXX: We assume that when IPV6 is non NULL,
		 * M and OFF are valid.
		 */
		struct in6_addr s;

		/* translate addresses into internal form */
		memcpy(&s, &ip6->ip6_src, sizeof(s));
		if (IN6_IS_ADDR_LINKLOCAL(&s))
			s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);

		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6,
					0, &s, 0, cmd, notify);
	} else {
		(void) in6_pcbnotify(&rawin6pcb, (struct sockaddr *)&sa6, 0,
					&zeroin6_addr, 0, cmd, notify);
	}
}

/*
 * Generate IPv6 header and pass packet to ip6_output.
 * Tack on options user may have setup with control call.
 */
int
#if __STDC__
rip6_output(struct mbuf *m, ...)
#else
rip6_output(m, va_alist)
	struct mbuf *m;
	va_dcl
#endif
{
	struct socket *so;
	struct sockaddr_in6 *dstsock;
	struct mbuf *control;
	struct in6_addr *dst;
	struct ip6_hdr *ip6;
	struct in6pcb *in6p;
	u_int	plen = m->m_pkthdr.len;
	int error = 0;
	struct ip6_pktopts opt, *optp = NULL;
	struct ifnet *oifp = NULL;
	int type, code;		/* for ICMPv6 output statistics only */
	int priv = 0;
	va_list ap;

	va_start(ap, m);
	so = va_arg(ap, struct socket *);
	dstsock = va_arg(ap, struct sockaddr_in6 *);
	control = va_arg(ap, struct mbuf *);
	va_end(ap);

	in6p = sotoin6pcb(so);

	priv = 0;
    {
	struct proc *p = curproc;	/* XXX */

	if (p && !suser(p->p_ucred, &p->p_acflag))
		priv = 1;
    }
	dst = &dstsock->sin6_addr;
	if (control) {
		if ((error = ip6_setpktoptions(control, &opt, priv)) != 0)
			goto bad;
		optp = &opt;
	} else
		optp = in6p->in6p_outputopts;

	/*
	 * For an ICMPv6 packet, we should know its type and code
	 * to update statistics.
	 */
	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
		struct icmp6_hdr *icmp6;
		if (m->m_len < sizeof(struct icmp6_hdr) &&
		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
			error = ENOBUFS;
			goto bad;
		}
		icmp6 = mtod(m, struct icmp6_hdr *);
		type = icmp6->icmp6_type;
		code = icmp6->icmp6_code;
	}

	M_PREPEND(m, sizeof(*ip6), M_WAIT);
	ip6 = mtod(m, struct ip6_hdr *);

	/*
	 * Next header might not be ICMP6 but use its pseudo header anyway.
	 */
	ip6->ip6_dst = *dst;

	/*
	 * If the scope of the destination is link-local, embed the interface
	 * index in the address.
	 *
	 * XXX advanced-api value overrides sin6_scope_id 
	 */
	if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
	    IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) {
		struct in6_pktinfo *pi;

		/*
		 * XXX Boundary check is assumed to be already done in
		 * ip6_setpktoptions().
		 */
		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
			oifp = ifindex2ifnet[pi->ipi6_ifindex];
		}
		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
			 in6p->in6p_moptions &&
			 in6p->in6p_moptions->im6o_multicast_ifp) {
			oifp = in6p->in6p_moptions->im6o_multicast_ifp;
			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
		} else if (dstsock->sin6_scope_id) {
			/* boundary check */
			if (dstsock->sin6_scope_id < 0 
			 || if_index < dstsock->sin6_scope_id) {
				error = ENXIO;  /* XXX EINVAL? */
				goto bad;
			}
			ip6->ip6_dst.s6_addr16[1]
				= htons(dstsock->sin6_scope_id & 0xffff);/*XXX*/
		}
	}

	/*
	 * Source address selection.
	 */
	{
		struct in6_addr *in6a;

		if ((in6a = in6_selectsrc(dstsock, optp,
					  in6p->in6p_moptions,
					  &in6p->in6p_route,
					  &in6p->in6p_laddr,
					  &error)) == 0) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			goto bad;
		}
		ip6->ip6_src = *in6a;
		if (in6p->in6p_route.ro_rt)
			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
	}

	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
	ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
	ip6->ip6_vfc  |= IPV6_VERSION;
#if 0				/* ip6_plen will be filled in ip6_output. */
	ip6->ip6_plen  = htons((u_short)plen);
#endif
	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);

	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
	    in6p->in6p_cksum != -1) {
		struct mbuf *n;
		int off;
		u_int16_t *p;

#define	offsetof(type, member)	((size_t)(&((type *)0)->member)) /* XXX */

		/* compute checksum */
		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
			off = offsetof(struct icmp6_hdr, icmp6_cksum);
		else
			off = in6p->in6p_cksum;
		if (plen < off + 1) {
			error = EINVAL;
			goto bad;
		}
		off += sizeof(struct ip6_hdr);

		n = m;
		while (n && n->m_len <= off) {
			off -= n->m_len;
			n = n->m_next;
		}
		if (!n)
			goto bad;
		p = (u_int16_t *)(mtod(n, caddr_t) + off);
		*p = 0;
		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
	}

	error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions,
			   &oifp);
	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
		if (oifp)
			icmp6_ifoutstat_inc(oifp, type, code);
		icmp6stat.icp6s_outhist[type]++;
	}

	goto freectl;

 bad:
	if (m)
		m_freem(m);

 freectl:
	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
		RTFREE(optp->ip6po_route.ro_rt);
	if (control)
		m_freem(control);
	return(error);
}

/*
 * Raw IPv6 socket option processing.
 */
int
rip6_ctloutput(op, so, level, optname, m)
	int op;
	struct socket *so;
	int level, optname;
	struct mbuf **m;
{
	int error = 0;

	switch(level) {
	 case IPPROTO_IPV6:
		 switch(optname) {
		  case MRT6_INIT:
		  case MRT6_DONE:
		  case MRT6_ADD_MIF:
		  case MRT6_DEL_MIF:
		  case MRT6_ADD_MFC:
		  case MRT6_DEL_MFC:
		  case MRT6_PIM:
			  if (op == PRCO_SETOPT) {
				  error = ip6_mrouter_set(optname, so, *m);
				  if (*m)
					  (void)m_free(*m);
			  } else if (op == PRCO_GETOPT) {
				  error = ip6_mrouter_get(optname, so, m);
			  } else
				  error = EINVAL;
			  return (error);
		 }
		 return (ip6_ctloutput(op, so, level, optname, m));
		 /* NOTREACHED */

	 case IPPROTO_ICMPV6:
		 /*
		  * XXX: is it better to call icmp6_ctloutput() directly
		  * from protosw?
		  */
		 return(icmp6_ctloutput(op, so, level, optname, m));

	 default:
		 if (op == PRCO_SETOPT && *m)
			 (void)m_free(*m);
		 return(EINVAL);
	}
}

extern	u_long rip6_sendspace;
extern	u_long rip6_recvspace;

int
rip6_usrreq(so, req, m, nam, control, p)
	register struct socket *so;
	int req;
	struct mbuf *m, *nam, *control;
	struct proc *p;
{
	register struct in6pcb *in6p = sotoin6pcb(so);
	int s;
	int error = 0;
/*	extern	struct socket *ip6_mrouter; */ /* xxx */
	int priv;

	priv = 0;
	if (p && !suser(p->p_ucred, &p->p_acflag))
		priv++;

	if (req == PRU_CONTROL)
		return (in6_control(so, (u_long)m, (caddr_t)nam,
				    (struct ifnet *)control, p));

	if (req == PRU_PURGEIF) {
		in6_purgeif((struct ifnet *)control);
		in6_pcbpurgeif(&rawin6pcb, (struct ifnet *)control);
		return (0);
	}

	switch (req) {
	case PRU_ATTACH:
		if (in6p)
			panic("rip6_attach");
		if (!priv) {
			error = EACCES;
			break;
		}
		s = splsoftnet();
		if ((error = soreserve(so, rip6_sendspace, rip6_recvspace)) ||
		    (error = in6_pcballoc(so, &rawin6pcb))) {
			splx(s);
			break;
		}
		splx(s);
		in6p = sotoin6pcb(so);
		in6p->in6p_ip6.ip6_nxt = (long)nam;
		in6p->in6p_cksum = -1;
#ifdef IPSEC
		error = ipsec_init_policy(so, &in6p->in6p_sp);
		if (error != 0) {
			in6_pcbdetach(in6p);
			break;
		}
#endif /*IPSEC*/
		
		MALLOC(in6p->in6p_icmp6filt, struct icmp6_filter *,
			sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
		if (in6p->in6p_icmp6filt == NULL) {
			in6_pcbdetach(in6p);
			error = ENOMEM;
			break;
		}
		ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
		break;

	case PRU_DISCONNECT:
		if ((so->so_state & SS_ISCONNECTED) == 0) {
			error = ENOTCONN;
			break;
		}
		in6p->in6p_faddr = in6addr_any;
		so->so_state &= ~SS_ISCONNECTED;	/* XXX */
		break;

	case PRU_ABORT:
		soisdisconnected(so);
		/* Fallthrough */
	case PRU_DETACH:
		if (in6p == 0)
			panic("rip6_detach");
		if (so == ip6_mrouter)
			ip6_mrouter_done();
		/* xxx: RSVP */
		if (in6p->in6p_icmp6filt) {
			FREE(in6p->in6p_icmp6filt, M_PCB);
			in6p->in6p_icmp6filt = NULL;
		}
		in6_pcbdetach(in6p);
		break;

	case PRU_BIND:
	    {
		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
		struct ifaddr *ia = NULL;

		if (nam->m_len != sizeof(*addr)) {
			error = EINVAL;
			break;
		}

		/*
		 * we don't support mapped address here, it would confuse
		 * users so reject it
		 */
		if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
			error = EADDRNOTAVAIL;
			break;
		}

		if ((ifnet.tqh_first == 0) ||
		   (addr->sin6_family != AF_INET6) ||
		   (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
		    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)) {
			error = EADDRNOTAVAIL;
			break;
		}
		if (ia &&
		    ((struct in6_ifaddr *)ia)->ia6_flags &
		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
		     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
			error = EADDRNOTAVAIL;
			break;
		}
		in6p->in6p_laddr = addr->sin6_addr;
		break;
	    }
		
	case PRU_CONNECT:
	    {
		struct sockaddr_in6 *addr = mtod(nam, struct sockaddr_in6 *);
		struct in6_addr *in6a = NULL;

		if (nam->m_len != sizeof(*addr)) {
			error = EINVAL;
			break;
		}
		if (ifnet.tqh_first == 0) {
			error = EADDRNOTAVAIL;
			break;
		}
		if (addr->sin6_family != AF_INET6) {
			error = EAFNOSUPPORT;
			break;
		}

		/* Source address selection. XXX: need pcblookup? */
		in6a = in6_selectsrc(addr, in6p->in6p_outputopts,
				     in6p->in6p_moptions,
				     &in6p->in6p_route,
				     &in6p->in6p_laddr,
				     &error);
		if (in6a == NULL) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			break;
		}
		in6p->in6p_laddr = *in6a;
		in6p->in6p_faddr = addr->sin6_addr;
		soisconnected(so);
		break;
	    }

	case PRU_CONNECT2:
		error = EOPNOTSUPP;
		break;

	/*
	 * Mark the connection as being incapable of futther input.
	 */
	case PRU_SHUTDOWN:
		socantsendmore(so);
		break;
	/*
	 * Ship a packet out. The appropriate raw output
	 * routine handles any messaging necessary.
	 */
	case PRU_SEND:
	    {
		struct sockaddr_in6 tmp;
		struct sockaddr_in6 *dst;

		if (so->so_state & SS_ISCONNECTED) {
			if (nam) {
				error = EISCONN;
				break;
			}
			/* XXX */
			bzero(&tmp, sizeof(tmp));
			tmp.sin6_family = AF_INET6;
			tmp.sin6_len = sizeof(struct sockaddr_in6);
			bcopy(&in6p->in6p_faddr, &tmp.sin6_addr,
				sizeof(struct in6_addr));
			dst = &tmp;
		} else {
			if (nam == NULL) {
				error = ENOTCONN;
				break;
			}
			dst = mtod(nam, struct sockaddr_in6 *);
		}
		error = rip6_output(m, so, dst, control);
		m = NULL;
		break;
	    }

	case PRU_SENSE:
		/*
		 * stat: don't bother with a blocksize
		 */
		return(0);
	/*
	 * Not supported.
	 */
	case PRU_RCVOOB:
	case PRU_RCVD:
	case PRU_LISTEN:
	case PRU_ACCEPT:
	case PRU_SENDOOB:
		error = EOPNOTSUPP;
		break;

	case PRU_SOCKADDR:
		in6_setsockaddr(in6p, nam);
		break;

	case PRU_PEERADDR:
		in6_setpeeraddr(in6p, nam);
		break;

	default:
		panic("rip6_usrreq");
	}
	if (m != NULL)
		m_freem(m);
	return(error);
}