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pull in new pcb notification code from kame.  better handling of scope address.

/*	$OpenBSD: in6_pcb.c,v 1.25 2001/02/16 16:00:56 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-nrl-95
This software is Copyright 1995-1998 by Randall Atkinson, Ronald Lee,
Daniel McDonald, Bao Phan, and Chris Winters. All Rights Reserved. All
rights under this copyright have been assigned to the US Naval Research
Laboratory (NRL). The NRL Copyright Notice and License Agreement Version
1.1 (January 17, 1995) applies to this software.
You should have received a copy of the license with this software. If you
didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.

*/
/*
 * Copyright (c) 1982, 1986, 1990, 1993, 1995
 *	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.
 *
 */

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

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

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>

#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>

/*
 * External globals
 */

#include <dev/rndvar.h>

extern struct in6_ifaddr *in6_ifaddr;
extern struct in_ifaddr *in_ifaddr;

/*
 * Globals
 */

struct in6_addr zeroin6_addr;

extern int ipport_firstauto;
extern int ipport_lastauto;
extern int ipport_hifirstauto;
extern int ipport_hilastauto;

/*
 * Keep separate inet6ctlerrmap, because I may remap some of these.
 * I also put it here, because, quite frankly, it belongs here, not in
 * ip{v6,}_input().
 */
#if 0
u_char inet6ctlerrmap[PRC_NCMDS] = {
	0,		0,		0,		0,
	0,		EMSGSIZE,	EHOSTDOWN,	EHOSTUNREACH,
	EHOSTUNREACH,	EHOSTUNREACH,	ECONNREFUSED,	ECONNREFUSED,
	EMSGSIZE,	EHOSTUNREACH,	0,		0,
	0,		0,		0,		0,
	ENOPROTOOPT
};
#endif

/*
 * Bind an address (or at least a port) to an PF_INET6 socket.
 */
int
in6_pcbbind(inp, nam)
	struct inpcb *inp;
	struct mbuf *nam;
{
	struct socket *so = inp->inp_socket;

	struct inpcbtable *head = inp->inp_table;
	struct sockaddr_in6 *sin6;
	struct proc *p = curproc;		/* XXX */
	u_short lport = 0;
	int wild = INPLOOKUP_IPV6, reuseport = (so->so_options & SO_REUSEPORT);
	int error;

	/*
	 * REMINDER:  Once up to speed, flow label processing should go here,
	 * too.  (Same with in6_pcbconnect.)
	 */
	if (in6_ifaddr == 0 || in_ifaddr == 0)
		return EADDRNOTAVAIL;

	if (inp->inp_lport != 0 || !IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6))
		return EINVAL;	/* If already bound, EINVAL! */

	if ((so->so_options & (SO_REUSEADDR | SO_REUSEPORT)) == 0 &&
	    ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
	     (so->so_options & SO_ACCEPTCONN) == 0))
		wild |= INPLOOKUP_WILDCARD;

	/*
	 * If I did get a sockaddr passed in...
	 */
	if (nam) {
		sin6 = mtod(nam, struct sockaddr_in6 *);
		if (nam->m_len != sizeof (*sin6))
			return EINVAL;

		/*
		 * Unlike v4, I have no qualms about EAFNOSUPPORT if the
		 * wretched family is not filled in!
		 */
		if (sin6->sin6_family != AF_INET6)
			return EAFNOSUPPORT;

		/* KAME hack: embed scopeid */
		if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
			return EINVAL;
		/* this must be cleared for ifa_ifwithaddr() */
		sin6->sin6_scope_id = 0;

		lport = sin6->sin6_port;

		/* reject IPv4 mapped address, we have no support for it */
		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
			return EADDRNOTAVAIL;

		if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
			/*
			 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
			 * allow complete duplication of binding if
			 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
			 * and a multicast address is bound on both
			 * new and duplicated sockets.
			 */
			if (so->so_options & SO_REUSEADDR)
				reuseport = SO_REUSEADDR | SO_REUSEPORT;
		} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
			struct ifaddr *ia = NULL;

			sin6->sin6_port = 0;  /*
					       * Yechhhh, because of upcoming
					       * call to ifa_ifwithaddr(), which
					       * does bcmp's over the PORTS as
					       * well.  (What about flow?)
					       */
			sin6->sin6_flowinfo = 0;
			if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6))
			    == NULL)
				return EADDRNOTAVAIL;

			/*
			 * XXX: bind to an anycast address might accidentally
			 * cause sending a packet with anycast source address.
			 * We should allow to bind to a deprecated address, since
			 * the application dare to use it.
			 */
			if (ia &&
			    ((struct in6_ifaddr *)ia)->ia6_flags &
			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED))
				return(EADDRNOTAVAIL);
		}
#if 0 /* we don't support it */
		else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
			struct sockaddr_in sin;

			bzero(&sin, sizeof(sin));
			sin.sin_port = 0;
			sin.sin_len = sizeof(sin);
			sin.sin_family = AF_INET;
			sin.sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];

			/*
			 * Yechhhh, because of upcoming call to
			 * ifa_ifwithaddr(), which does bcmp's
			 * over the PORTS as well.  (What about flow?)
			 */
			sin6->sin6_port = 0;
			sin6->sin6_flowinfo = 0;
			if (ifa_ifwithaddr((struct sockaddr *)sin6) == 0) {
				if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ||
				    ifa_ifwithaddr((struct sockaddr *)&sin) == 0) {
					return EADDRNOTAVAIL;
				}
			}
		}
#endif
		if (lport) {
			struct inpcb *t;
#if 0 /* we don't support IPv4 mapped address */
			struct in_addr fa,la;
#endif

			/*
			 * Question:  Do we wish to continue the Berkeley
			 * tradition of ports < IPPORT_RESERVED be only for
			 * root?
			 * Answer: For now yes, but IMHO, it should be REMOVED!
			 * OUCH: One other thing, is there no better way of
			 * finding a process for a socket instead of using
			 * curproc?  (Marked with BSD's {in,}famous XXX ?
			 */
			if (ntohs(lport) < IPPORT_RESERVED &&
			    (error = suser(p->p_ucred, &p->p_acflag)))
				return error;

#if 0 /* we don't support IPv4 mapped address */
			if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
				fa.s_addr = 0;
				la.s_addr = sin6->sin6_addr.s6_addr32[3];
				wild &= ~INPLOOKUP_IPV6;

				t = in_pcblookup(head, (struct in_addr *)&fa, 0,
				    (struct in_addr *)&la, lport, wild);
			} else
#endif
			{
				t = in_pcblookup(head,
				    (struct in_addr *)&zeroin6_addr, 0,
				    (struct in_addr *)&sin6->sin6_addr, lport,
				    wild);
			}

			if (t && (reuseport & t->inp_socket->so_options) == 0)
				return EADDRINUSE;
		}
		inp->inp_laddr6 = sin6->sin6_addr;

		if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
			inp->inp_ipv6.ip6_flow = htonl(0x60000000) |
			    (sin6->sin6_flowinfo & htonl(0x0fffffff));
		}
	}

	if (lport == 0) {
		error = in6_pcbsetport(&inp->inp_laddr6, inp);
		if (error != 0)
			return error;
	} else
		inp->inp_lport = lport;

	in_pcbrehash(inp);

	return 0;
}

int
in6_pcbsetport(laddr, inp)
	struct in6_addr *laddr;
	struct inpcb *inp;
{
	struct socket *so = inp->inp_socket;
	struct inpcbtable *table = inp->inp_table;
	u_int16_t first, last, old = 0;
	u_int16_t *lastport = &inp->inp_table->inpt_lastport;
	u_int16_t lport = 0;
	int count;
	int loopcount = 0;
	int wild = INPLOOKUP_IPV6;
	struct proc *p = curproc;		/* XXX */
	int error;

	/* XXX we no longer support IPv4 mapped address, so no tweaks here */

	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
	    ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
	     (so->so_options & SO_ACCEPTCONN) == 0))
		wild |= INPLOOKUP_WILDCARD;

	if (inp->inp_flags & INP_HIGHPORT) {
		first = ipport_hifirstauto;	/* sysctl */
		last = ipport_hilastauto;
	} else if (inp->inp_flags & INP_LOWPORT) {
		if ((error = suser(p->p_ucred, &p->p_acflag)))
			return (EACCES);
		first = IPPORT_RESERVED-1; /* 1023 */
		last = 600;		   /* not IPPORT_RESERVED/2 */
	} else {
		first = ipport_firstauto;	/* sysctl */
		last  = ipport_lastauto;
	}

	/*
	 * Simple check to ensure all ports are not used up causing
	 * a deadlock here.
	 *
	 * We split the two cases (up and down) so that the direction
	 * is not being tested on each round of the loop.
	 */

portloop:
	if (first > last) {
		/*
		 * counting down
		 */
		if (loopcount == 0) {	/* only do this once. */
			old = first;
			first -= (arc4random() % (first - last));
		}
		count = first - last;
		*lastport = first;		/* restart each time */

		do {
			if (count-- <= 0) {	/* completely used? */
				if (loopcount == 0) {
					last = old;
					loopcount++;
					goto portloop;
				}
				return (EADDRNOTAVAIL);
			}
			--*lastport;
			if (*lastport > first || *lastport < last)
				*lastport = first;
			lport = htons(*lastport);
		} while (in_baddynamic(*lastport, so->so_proto->pr_protocol) ||
		    in_pcblookup(table, &zeroin6_addr, 0,
		    &inp->inp_laddr6, lport, wild));
	} else {
		/*
		 * counting up
		 */
		if (loopcount == 0) {	/* only do this once. */
			old = first;
			first += (arc4random() % (last - first));
		}
		count = last - first;
		*lastport = first;		/* restart each time */

		do {
			if (count-- <= 0) {	/* completely used? */
				if (loopcount == 0) {
					first = old;
					loopcount++;
					goto portloop;
				}
				return (EADDRNOTAVAIL);
			}
			++*lastport;
			if (*lastport < first || *lastport > last)
				*lastport = first;
			lport = htons(*lastport);
		} while (in_baddynamic(*lastport, so->so_proto->pr_protocol) ||
		    in_pcblookup(table, &zeroin6_addr, 0,
		    &inp->inp_laddr6, lport, wild));
	}

	inp->inp_lport = lport;
	in_pcbrehash(inp);

	return 0;
}

/*
 * Connect from a socket to a specified address.
 * Both address and port must be specified in argument sin6.
 * Eventually, flow labels will have to be dealt with here, as well.
 *
 * If don't have a local address for this socket yet,
 * then pick one.
 *
 * I believe this has to be called at splnet().
 */
int
in6_pcbconnect(inp, nam)
	struct inpcb *inp;
	struct mbuf *nam;
{
	struct in6_addr *in6a = NULL;
	struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
	struct ifnet *ifp = NULL;	/* outgoing interface */
	int error = 0;
	struct in6_addr mapped;
	struct sockaddr_in6 tmp;

	(void)&in6a;				/* XXX fool gcc */

	if (nam->m_len != sizeof(*sin6))
		return(EINVAL);
	if (sin6->sin6_family != AF_INET6)
		return(EAFNOSUPPORT);
	if (sin6->sin6_port == 0)
		return(EADDRNOTAVAIL);

	/* reject IPv4 mapped address, we have no support for it */
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
		return EADDRNOTAVAIL;

	/* sanity check for mapped address case */
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
		if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6))
			inp->inp_laddr6.s6_addr16[5] = htons(0xffff);
		if (!IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6))
			return EINVAL;
	} else {
		if (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6))
			return EINVAL;
	}

	/* protect *sin6 from overwrites */
	tmp = *sin6;
	sin6 = &tmp;

	/* KAME hack: embed scopeid */
	if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
		return EINVAL;
	/* this must be cleared for ifa_ifwithaddr() */
	sin6->sin6_scope_id = 0;

	/* Source address selection. */
	if (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6) &&
	    inp->inp_laddr6.s6_addr32[3] == 0) {
		struct sockaddr_in sin, *sinp;

		bzero(&sin, sizeof(sin));
		sin.sin_len = sizeof(sin);
		sin.sin_family = AF_INET;
		bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr,
		    sizeof(sin.sin_addr));
		sinp = in_selectsrc(&sin, (struct route *)&inp->inp_route6,
		    inp->inp_socket->so_options, NULL, &error);
		if (sinp == 0) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			return(error);
		}
		bzero(&mapped, sizeof(mapped));
		mapped.s6_addr16[5] = htons(0xffff);
		bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr));
		in6a = &mapped;
	} else {
		/*
		 * XXX: in6_selectsrc might replace the bound local address
		 * with the address specified by setsockopt(IPV6_PKTINFO).
		 * Is it the intended behavior?
		 */
		in6a = in6_selectsrc(sin6, inp->inp_outputopts6,
		    inp->inp_moptions6, &inp->inp_route6, &inp->inp_laddr6,
		    &error);
		if (in6a == 0) {
			if (error == 0)
				error = EADDRNOTAVAIL;
			return(error);
		}
	}
	if (inp->inp_route6.ro_rt)
		ifp = inp->inp_route6.ro_rt->rt_ifp;

	inp->inp_ipv6.ip6_hlim = (u_int8_t)in6_selecthlim(inp, ifp);

	if (in_pcblookup(inp->inp_table, &sin6->sin6_addr, sin6->sin6_port,
	    IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ? in6a : &inp->inp_laddr6,
	    inp->inp_lport, INPLOOKUP_IPV6)) {
		return(EADDRINUSE);
	}
	if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ||
	    (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6) &&
	     inp->inp_laddr6.s6_addr32[3] == 0)) {
		if (inp->inp_lport == 0)
			(void)in6_pcbbind(inp, (struct mbuf *)0);
		inp->inp_laddr6 = *in6a;
	}
	inp->inp_faddr6 = sin6->sin6_addr;
	inp->inp_fport = sin6->sin6_port;
	/*
	 * xxx kazu flowlabel is necessary for connect?
	 * but if this line is missing, the garbage value remains.
	 */
	inp->inp_ipv6.ip6_flow = sin6->sin6_flowinfo;
	in_pcbrehash(inp);
	return(0);
}

/*
 * Pass some notification to all connections of a protocol
 * associated with address dst.  The local address and/or port numbers
 * may be specified to limit the search.  The "usual action" will be
 * taken, depending on the ctlinput cmd.  The caller must filter any
 * cmds that are uninteresting (e.g., no error in the map).
 * Call the protocol specific routine (if any) to report
 * any errors for each matching socket.
 *
 * Also perform input-side security policy check
 *    once PCB to be notified has been located.
 *
 * Must be called at splnet.
 */
int
in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
	struct inpcbtable *head;
	struct sockaddr *dst, *src;
	uint fport_arg;
	uint lport_arg;
	int cmd;
	void *cmdarg;
	void (*notify) __P((struct inpcb *, int));
{
	struct inpcb *inp, *ninp;
	u_short fport = fport_arg, lport = lport_arg;
	struct sockaddr_in6 sa6_src, *sa6_dst;
	int errno, nmatch = 0;
	u_int32_t flowinfo;

	if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
		return 1;

	sa6_dst = (struct sockaddr_in6 *)dst;
	if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
		return 1;
	if (IN6_IS_ADDR_V4MAPPED(&sa6_dst->sin6_addr))
		printf("Huh?  Thought in6_pcbnotify() never got "
		       "called with mapped!\n");

	/*
	 * note that src can be NULL when we get notify by local fragmentation.
	 */
	sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src;
	flowinfo = sa6_src.sin6_flowinfo;

	/*
	 * Redirects go to all references to the destination,
	 * and use in_rtchange to invalidate the route cache.
	 * Dead host indications: also use in_rtchange to invalidate
	 * the cache, and deliver the error to all the sockets.
	 * Otherwise, if we have knowledge of the local port and address,
	 * deliver only to that socket.
	 */
	if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
		fport = 0;
		lport = 0;
		sa6_src.sin6_addr = in6addr_any;

		if (cmd != PRC_HOSTDEAD)
			notify = in_rtchange;
	}
	errno = inet6ctlerrmap[cmd];

	for (inp = head->inpt_queue.cqh_first;
	     inp != (struct inpcb *)&head->inpt_queue; inp = ninp) {
		ninp = inp->inp_queue.cqe_next;

		if ((inp->inp_flags & INP_IPV6) == 0)
			continue;

		/*
		 * Under the following condition, notify of redirects
		 * to the pcb, without making address matches against inpcb.
		 * - redirect notification is arrived.
		 * - the inpcb is unconnected.
		 * - the inpcb is caching !RTF_HOST routing entry.
		 * - the ICMPv6 notification is from the gateway cached in the
		 *   inpcb.  i.e. ICMPv6 notification is from nexthop gateway
		 *   the inpcb used very recently.
		 *
		 * This is to improve interaction between netbsd/openbsd
		 * redirect handling code, and inpcb route cache code.
		 * without the clause, !RTF_HOST routing entry (which carries
		 * gateway used by inpcb right before the ICMPv6 redirect)
		 * will be cached forever in unconnected inpcb.
		 *
		 * There still is a question regarding to what is TRT:
		 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be
		 *   generated on packet output.  inpcb will always cache
		 *   RTF_HOST routing entry so there's no need for the clause
		 *   (ICMPv6 redirect will update RTF_HOST routing entry,
		 *   and inpcb is caching it already).
		 *   However, bsdi/freebsd are vulnerable to local DoS attacks
		 *   due to the cloned routing entries.
		 * - Specwise, "destination cache" is mentioned in RFC2461.
		 *   Jinmei says that it implies bsdi/freebsd behavior, itojun
		 *   is not really convinced.
		 * - Having hiwat/lowat on # of cloned host route (redirect/
		 *   pmtud) may be a good idea.  netbsd/openbsd has it.  see
		 *   icmp6_mtudisc_update().
		 */
		if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) &&
		    IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) &&
		    inp->inp_route.ro_rt &&
		    !(inp->inp_route.ro_rt->rt_flags & RTF_HOST)) {
			struct sockaddr_in6 *dst6;

			dst6 = (struct sockaddr_in6 *)&inp->inp_route.ro_dst;
			if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr,
			    &sa6_dst->sin6_addr))
				goto do_notify;
		}

		/*
		 * Detect if we should notify the error. If no source and
		 * destination ports are specifed, but non-zero flowinfo and
		 * local address match, notify the error. This is the case
		 * when the error is delivered with an encrypted buffer
		 * by ESP. Otherwise, just compare addresses and ports
		 * as usual.
		 */
		if (lport == 0 && fport == 0 && flowinfo &&
		    inp->inp_socket != NULL &&
		    flowinfo == (inp->inp_flowinfo & IPV6_FLOWLABEL_MASK) &&
		    IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &sa6_src.sin6_addr))
			goto do_notify;
		else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6,
					     &sa6_dst->sin6_addr) ||
			 inp->inp_socket == 0 ||
			 (lport && inp->inp_lport != lport) ||
			 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
			  !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6,
					      &sa6_src.sin6_addr)) ||
			 (fport && inp->inp_fport != fport)) {
			continue;
		}
	  do_notify:
		nmatch++;
		if (notify)
			(*notify)(inp, errno);
	}
	return 0;
}

/*
 * Get the local address/port, and put it in a sockaddr_in6.
 * This services the getsockname(2) call.
 */
int
in6_setsockaddr(inp, nam)
	struct inpcb *inp;
	struct mbuf *nam;
{
	struct sockaddr_in6 *sin6;

	nam->m_len = sizeof(struct sockaddr_in6);
	sin6 = mtod(nam,struct sockaddr_in6 *);

	bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6));
	sin6->sin6_family = AF_INET6;
	sin6->sin6_len = sizeof(struct sockaddr_in6);
	sin6->sin6_port = inp->inp_lport;
	sin6->sin6_addr = inp->inp_laddr6;
	/* KAME hack: recover scopeid */
	(void)in6_recoverscope(sin6, &inp->inp_laddr6, NULL);

	return 0;
}

/*
 * Get the foreign address/port, and put it in a sockaddr_in6.
 * This services the getpeername(2) call.
 */
int
in6_setpeeraddr(inp, nam)
	struct inpcb *inp;
	struct mbuf *nam;
{
	struct sockaddr_in6 *sin6;

	nam->m_len = sizeof(struct sockaddr_in6);
	sin6 = mtod(nam,struct sockaddr_in6 *);

	bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6));
	sin6->sin6_family = AF_INET6;
	sin6->sin6_len = sizeof(struct sockaddr_in6);
	sin6->sin6_port = inp->inp_fport;
	sin6->sin6_addr = inp->inp_faddr6;

	return 0;
}