xref: /src/sys/netinet6/raw_ip6.c

/*	$NetBSD: raw_ip6.c,v 1.157.2.4 2018/04/09 13:34:10 bouyer Exp $	*/
/*	$KAME: raw_ip6.c,v 1.82 2001/07/23 18:57:56 jinmei 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. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: raw_ip6.c,v 1.157.2.4 2018/04/09 13:34:10 bouyer Exp $");

#ifdef _KERNEL_OPT
#include "opt_ipsec.h"
#include "opt_net_mpsafe.h"
#endif

#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/kmem.h>

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

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet6/ip6_mroute.h>
#include <netinet/icmp6.h>
#include <netinet6/icmp6_private.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/scope6_var.h>
#include <netinet6/raw_ip6.h>

#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec_var.h>
#include <netipsec/ipsec_private.h>
#include <netipsec/ipsec6.h>
#endif

#include "faith.h"
#if defined(NFAITH) && 0 < NFAITH
#include <net/if_faith.h>
#endif

extern struct inpcbtable rawcbtable;
struct	inpcbtable raw6cbtable;
#define ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))

/*
 * Raw interface to IP6 protocol.
 */

static percpu_t *rip6stat_percpu;

#define	RIP6_STATINC(x)		_NET_STATINC(rip6stat_percpu, x)

static void sysctl_net_inet6_raw6_setup(struct sysctllog **);

/*
 * Initialize raw connection block queue.
 */
void
rip6_init(void)
{

	sysctl_net_inet6_raw6_setup(NULL);
	in6_pcbinit(&raw6cbtable, 1, 1);

	rip6stat_percpu = percpu_alloc(sizeof(uint64_t) * RIP6_NSTATS);
}

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

	RIP6_STATINC(RIP6_STAT_IPACKETS);

#if defined(NFAITH) && 0 < NFAITH
	if (faithprefix(&ip6->ip6_dst)) {
		/* 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;
	}

	sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0);
	if (sa6_recoverscope(&rip6src) != 0) {
		/* XXX: should be impossible. */
		m_freem(m);
		return IPPROTO_DONE;
	}

	TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) {
		in6p = (struct in6pcb *)inph;
		if (in6p->in6p_af != AF_INET6)
			continue;
		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) {
			RIP6_STATINC(RIP6_STAT_ISUM);
			if (in6_cksum(m, proto, *offp,
			    m->m_pkthdr.len - *offp)) {
				RIP6_STATINC(RIP6_STAT_BADSUM);
				continue;
			}
		}
		if (last) {
			struct	mbuf *n;

#ifdef IPSEC
			/*
			 * Check AH/ESP integrity
			 */
			if (!ipsec_used ||
			    (ipsec_used && !ipsec6_in_reject(m, last)))
#endif /* IPSEC */
			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,
				    sin6tosa(&rip6src), n, opts) == 0) {
					soroverflow(last->in6p_socket);
					m_freem(n);
					if (opts)
						m_freem(opts);
					RIP6_STATINC(RIP6_STAT_FULLSOCK);
				} else
					sorwakeup(last->in6p_socket);
				opts = NULL;
			}
		}
		last = in6p;
	}
#ifdef IPSEC
	if (ipsec_used && last && ipsec6_in_reject(m, last)) {
		m_freem(m);
		/*
		 * XXX ipsec6_in_reject update stat if there is an error
		 * so we just need to update stats by hand in the case of last is
		 * NULL
		 */
		if (!last)
			IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
			IP6_STATDEC(IP6_STAT_DELIVERED);
			/* do not inject data into pcb */
		} else
#endif /* IPSEC */
	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,
		    sin6tosa(&rip6src), m, opts) == 0) {
			soroverflow(last->in6p_socket);
			m_freem(m);
			if (opts)
				m_freem(opts);
			RIP6_STATINC(RIP6_STAT_FULLSOCK);
		} else
			sorwakeup(last->in6p_socket);
	} else {
		RIP6_STATINC(RIP6_STAT_NOSOCK);
		if (m->m_flags & M_MCAST)
			RIP6_STATINC(RIP6_STAT_NOSOCKMCAST);
		if (proto == IPPROTO_NONE)
			m_freem(m);
		else {
			int s;
			struct ifnet *rcvif = m_get_rcvif(m, &s);
			const int prvnxt = ip6_get_prevhdr(m, *offp);
			in6_ifstat_inc(rcvif, ifs6_in_protounknown);
			m_put_rcvif(rcvif, &s);
			icmp6_error(m, ICMP6_PARAM_PROB,
			    ICMP6_PARAMPROB_NEXTHEADER,
			    prvnxt);
		}
		IP6_STATDEC(IP6_STAT_DELIVERED);
	}
	return IPPROTO_DONE;
}

void *
rip6_ctlinput(int cmd, const struct sockaddr *sa, void *d)
{
	struct ip6_hdr *ip6;
	struct ip6ctlparam *ip6cp = NULL;
	const struct sockaddr_in6 *sa6_src = NULL;
	void *cmdarg;
	void (*notify)(struct in6pcb *, int) = in6_rtchange;
	int nxt;

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

	if ((unsigned)cmd >= PRC_NCMDS)
		return NULL;
	if (PRC_IS_REDIRECT(cmd))
		notify = in6_rtchange, d = NULL;
	else if (cmd == PRC_HOSTDEAD)
		d = NULL;
	else if (cmd == PRC_MSGSIZE)
		; /* special code is present, see below */
	else if (inet6ctlerrmap[cmd] == 0)
		return NULL;

	/* if the parameter is from icmp6, decode it. */
	if (d != NULL) {
		ip6cp = (struct ip6ctlparam *)d;
		ip6 = ip6cp->ip6c_ip6;
		cmdarg = ip6cp->ip6c_cmdarg;
		sa6_src = ip6cp->ip6c_src;
		nxt = ip6cp->ip6c_nxt;
	} else {
		ip6 = NULL;
		cmdarg = NULL;
		sa6_src = &sa6_any;
		nxt = -1;
	}

	if (ip6 && cmd == PRC_MSGSIZE) {
		const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa;
		int valid = 0;
		struct in6pcb *in6p;

		/*
		 * Check to see if we have a valid raw IPv6 socket
		 * corresponding to the address in the ICMPv6 message
		 * payload, and the protocol (ip6_nxt) meets the socket.
		 * XXX chase extension headers, or pass final nxt value
		 * from icmp6_notify_error()
		 */
		in6p = NULL;
		in6p = in6_pcblookup_connect(&raw6cbtable, &sa6->sin6_addr, 0,
					     (const struct in6_addr *)&sa6_src->sin6_addr, 0, 0, 0);
#if 0
		if (!in6p) {
			/*
			 * As the use of sendto(2) is fairly popular,
			 * we may want to allow non-connected pcb too.
			 * But it could be too weak against attacks...
			 * We should at least check if the local
			 * address (= s) is really ours.
			 */
			in6p = in6_pcblookup_bind(&raw6cbtable,
			    &sa6->sin6_addr, 0, 0);
		}
#endif

		if (in6p && in6p->in6p_ip6.ip6_nxt &&
		    in6p->in6p_ip6.ip6_nxt == nxt)
			valid++;

		/*
		 * Depending on the value of "valid" and routing table
		 * size (mtudisc_{hi,lo}wat), we will:
		 * - recalculate the new MTU and create the
		 *   corresponding routing entry, or
		 * - ignore the MTU change notification.
		 */
		icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);

		/*
		 * regardless of if we called icmp6_mtudisc_update(),
		 * we need to call in6_pcbnotify(), to notify path MTU
		 * change to the userland (RFC3542), because some
		 * unconnected sockets may share the same destination
		 * and want to know the path MTU.
		 */
	}

	(void) in6_pcbnotify(&raw6cbtable, sa, 0,
	    sin6tocsa(sa6_src), 0, cmd, cmdarg, notify);
	return NULL;
}

/*
 * Generate IPv6 header and pass packet to ip6_output.
 * Tack on options user may have setup with control call.
 */
int
rip6_output(struct mbuf *m, struct socket * const so,
    struct sockaddr_in6 * const dstsock, struct mbuf * const 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 scope_ambiguous = 0;
	int bound = curlwp_bind();
	struct psref psref;

	in6p = sotoin6pcb(so);

	dst = &dstsock->sin6_addr;
	if (control) {
		if ((error = ip6_setpktopts(control, &opt,
		    in6p->in6p_outputopts,
		    kauth_cred_get(), so->so_proto->pr_protocol)) != 0) {
			goto bad;
		}
		optp = &opt;
	} else
		optp = in6p->in6p_outputopts;

	/*
	 * Check and convert scope zone ID into internal form.
	 * XXX: we may still need to determine the zone later.
	 */
	if (!(so->so_state & SS_ISCONNECTED)) {
		if (dstsock->sin6_scope_id == 0 && !ip6_use_defzone)
			scope_ambiguous = 1;
		if ((error = sa6_embedscope(dstsock, ip6_use_defzone)) != 0)
			goto bad;
	}

	/*
	 * 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;
	} else {
		type = 0;
		code = 0;
	}

	M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
	if (!m) {
		error = ENOBUFS;
		goto bad;
	}
	ip6 = mtod(m, struct ip6_hdr *);

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

	/*
	 * Source address selection.
	 */
	error = in6_selectsrc(dstsock, optp, in6p->in6p_moptions,
	    &in6p->in6p_route, &in6p->in6p_laddr, &oifp, &psref, &ip6->ip6_src);
	if (error != 0)
		goto bad;

	if (oifp && scope_ambiguous) {
		/*
		 * Application should provide a proper zone ID or the use of
		 * default zone IDs should be enabled.  Unfortunately, some
		 * applications do not behave as it should, so we need a
		 * workaround.  Even if an appropriate ID is not determined
		 * (when it's required), if we can determine the outgoing
		 * interface. determine the zone ID based on the interface.
		 */
		error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
		if (error != 0)
			goto bad;
	}
	ip6->ip6_dst = dstsock->sin6_addr;

	/* fill in the rest of the IPv6 header fields */
	ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
	ip6->ip6_vfc  &= ~IPV6_VERSION_MASK;
	ip6->ip6_vfc  |= IPV6_VERSION;
	/* ip6_plen will be filled in ip6_output, so not fill it here. */
	ip6->ip6_nxt   = in6p->in6p_ip6.ip6_nxt;
	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);

	if_put(oifp, &psref);
	oifp = NULL;

	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
	    in6p->in6p_cksum != -1) {
		const uint8_t nxt = ip6->ip6_nxt;
		int off;
		u_int16_t sum;

		/* 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);

		sum = 0;
		m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum,
		    M_DONTWAIT);
		if (m == NULL) {
			error = ENOBUFS;
			goto bad;
		}
		sum = in6_cksum(m, nxt, sizeof(*ip6), plen);
		m = m_copyback_cow(m, off, sizeof(sum), (void *)&sum,
		    M_DONTWAIT);
		if (m == NULL) {
			error = ENOBUFS;
			goto bad;
		}
	}

	{
		struct ifnet *ret_oifp = NULL;

		error = ip6_output(m, optp, &in6p->in6p_route, 0,
		    in6p->in6p_moptions, in6p, &ret_oifp);
		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
			if (ret_oifp)
				icmp6_ifoutstat_inc(ret_oifp, type, code);
			ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
		} else
			RIP6_STATINC(RIP6_STAT_OPACKETS);
	}

	goto freectl;

 bad:
	if (m)
		m_freem(m);

 freectl:
	if (control) {
		ip6_clearpktopts(&opt, -1);
		m_freem(control);
	}
	if_put(oifp, &psref);
	curlwp_bindx(bound);
	return error;
}

/*
 * Raw IPv6 socket option processing.
 */
int
rip6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
	int error = 0;

	if (sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_NOHEADER) {
		int optval;

		/* need to fiddle w/ opt(IPPROTO_IPV6, IPV6_CHECKSUM)? */
		if (op == PRCO_GETOPT) {
			optval = 1;
			error = sockopt_set(sopt, &optval, sizeof(optval));
		} else if (op == PRCO_SETOPT) {
			error = sockopt_getint(sopt, &optval);
			if (error)
				goto out;
			if (optval == 0)
				error = EINVAL;
		}

		goto out;
	} else if (sopt->sopt_level != IPPROTO_IPV6)
		return ip6_ctloutput(op, so, sopt);

	switch (sopt->sopt_name) {
	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(so, sopt);
		else if (op == PRCO_GETOPT)
			error = ip6_mrouter_get(so, sopt);
		else
			error = EINVAL;
		break;
	case IPV6_CHECKSUM:
		return ip6_raw_ctloutput(op, so, sopt);
	default:
		return ip6_ctloutput(op, so, sopt);
	}
 out:
	return error;
}

extern	u_long rip6_sendspace;
extern	u_long rip6_recvspace;

int
rip6_attach(struct socket *so, int proto)
{
	struct in6pcb *in6p;
	int s, error;

	KASSERT(sotoin6pcb(so) == NULL);
	sosetlock(so);

	error = kauth_authorize_network(curlwp->l_cred,
	    KAUTH_NETWORK_SOCKET, KAUTH_REQ_NETWORK_SOCKET_RAWSOCK,
	    KAUTH_ARG(AF_INET6),
	    KAUTH_ARG(SOCK_RAW),
	    KAUTH_ARG(so->so_proto->pr_protocol));
	if (error) {
		return error;
	}
	s = splsoftnet();
	error = soreserve(so, rip6_sendspace, rip6_recvspace);
	if (error) {
		splx(s);
		return error;
	}
	if ((error = in6_pcballoc(so, &raw6cbtable)) != 0) {
		splx(s);
		return error;
	}
	splx(s);
	in6p = sotoin6pcb(so);
	in6p->in6p_ip6.ip6_nxt = proto;
	in6p->in6p_cksum = -1;

	in6p->in6p_icmp6filt = kmem_alloc(sizeof(struct icmp6_filter), KM_SLEEP);
	ICMP6_FILTER_SETPASSALL(in6p->in6p_icmp6filt);
	KASSERT(solocked(so));
	return error;
}

static void
rip6_detach(struct socket *so)
{
	struct in6pcb *in6p = sotoin6pcb(so);

	KASSERT(solocked(so));
	KASSERT(in6p != NULL);

	if (so == ip6_mrouter) {
		ip6_mrouter_done();
	}
	/* xxx: RSVP */
	if (in6p->in6p_icmp6filt != NULL) {
		kmem_free(in6p->in6p_icmp6filt, sizeof(struct icmp6_filter));
		in6p->in6p_icmp6filt = NULL;
	}
	in6_pcbdetach(in6p);
}

static int
rip6_accept(struct socket *so, struct sockaddr *nam)
{
	KASSERT(solocked(so));

	return EOPNOTSUPP;
}

static int
rip6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
	struct in6pcb *in6p = sotoin6pcb(so);
	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
	struct ifaddr *ifa = NULL;
	int error = 0;
	int s;

	KASSERT(solocked(so));
	KASSERT(in6p != NULL);
	KASSERT(nam != NULL);

	if (addr->sin6_len != sizeof(*addr))
		return EINVAL;
	if (IFNET_READER_EMPTY() || addr->sin6_family != AF_INET6)
		return EADDRNOTAVAIL;

	if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
		return error;

	/*
	 * we don't support mapped address here, it would confuse
	 * users so reject it
	 */
	if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr))
		return EADDRNOTAVAIL;
	s = pserialize_read_enter();
	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
	    (ifa = ifa_ifwithaddr(sin6tosa(addr))) == NULL) {
		error = EADDRNOTAVAIL;
		goto out;
	}
	if (ifa && (ifatoia6(ifa))->ia6_flags &
	    (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) {
		error = EADDRNOTAVAIL;
		goto out;
	}

	in6p->in6p_laddr = addr->sin6_addr;
	error = 0;
out:
	pserialize_read_exit(s);
	return error;
}

static int
rip6_listen(struct socket *so, struct lwp *l)
{
	KASSERT(solocked(so));

	return EOPNOTSUPP;
}

static int
rip6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
	struct in6pcb *in6p = sotoin6pcb(so);
	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
	struct in6_addr in6a;
	struct ifnet *ifp = NULL;
	int scope_ambiguous = 0;
	int error = 0;
	struct psref psref;
	int bound;

	KASSERT(solocked(so));
	KASSERT(in6p != NULL);
	KASSERT(nam != NULL);

	if (IFNET_READER_EMPTY())
		return EADDRNOTAVAIL;
	if (addr->sin6_family != AF_INET6)
		return EAFNOSUPPORT;

	/*
	 * Application should provide a proper zone ID or the use of
	 * default zone IDs should be enabled.  Unfortunately, some
	 * applications do not behave as it should, so we need a
	 * workaround.  Even if an appropriate ID is not determined,
	 * we'll see if we can determine the outgoing interface.  If we
	 * can, determine the zone ID based on the interface below.
	 */
	if (addr->sin6_scope_id == 0 && !ip6_use_defzone)
		scope_ambiguous = 1;
	if ((error = sa6_embedscope(addr, ip6_use_defzone)) != 0)
		return error;

	bound = curlwp_bind();
	/* Source address selection. XXX: need pcblookup? */
	error = in6_selectsrc(addr, in6p->in6p_outputopts,
	    in6p->in6p_moptions, &in6p->in6p_route,
	    &in6p->in6p_laddr, &ifp, &psref, &in6a);
	if (error != 0)
		goto out;
	/* XXX: see above */
	if (ifp && scope_ambiguous &&
	    (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
		goto out;
	}
	in6p->in6p_laddr = in6a;
	in6p->in6p_faddr = addr->sin6_addr;
	soisconnected(so);
out:
	if_put(ifp, &psref);
	curlwp_bindx(bound);
	return error;
}

static int
rip6_connect2(struct socket *so, struct socket *so2)
{
	KASSERT(solocked(so));

	return EOPNOTSUPP;
}

static int
rip6_disconnect(struct socket *so)
{
	struct in6pcb *in6p = sotoin6pcb(so);

	KASSERT(solocked(so));
	KASSERT(in6p != NULL);

	if ((so->so_state & SS_ISCONNECTED) == 0)
		return ENOTCONN;

	in6p->in6p_faddr = in6addr_any;
	so->so_state &= ~SS_ISCONNECTED;	/* XXX */
	return 0;
}

static int
rip6_shutdown(struct socket *so)
{
	KASSERT(solocked(so));

	/*
	 * Mark the connection as being incapable of futther input.
	 */
	socantsendmore(so);
	return 0;
}

static int
rip6_abort(struct socket *so)
{
	KASSERT(solocked(so));

	soisdisconnected(so);
	rip6_detach(so);
	return 0;
}

static int
rip6_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
{
	return in6_control(so, cmd, nam, ifp);
}

static int
rip6_stat(struct socket *so, struct stat *ub)
{
	KASSERT(solocked(so));

	/* stat: don't bother with a blocksize */
	return 0;
}

static int
rip6_peeraddr(struct socket *so, struct sockaddr *nam)
{
	KASSERT(solocked(so));
	KASSERT(sotoin6pcb(so) != NULL);
	KASSERT(nam != NULL);

	in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam);
	return 0;
}

static int
rip6_sockaddr(struct socket *so, struct sockaddr *nam)
{
	KASSERT(solocked(so));
	KASSERT(sotoin6pcb(so) != NULL);
	KASSERT(nam != NULL);

	in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam);
	return 0;
}

static int
rip6_rcvd(struct socket *so, int flags, struct lwp *l)
{
	KASSERT(solocked(so));

	return EOPNOTSUPP;
}

static int
rip6_recvoob(struct socket *so, struct mbuf *m, int flags)
{
	KASSERT(solocked(so));

	return EOPNOTSUPP;
}

static int
rip6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
    struct mbuf *control, struct lwp *l)
{
	struct in6pcb *in6p = sotoin6pcb(so);
	struct sockaddr_in6 tmp;
	struct sockaddr_in6 *dst;
	int error = 0;

	KASSERT(solocked(so));
	KASSERT(in6p != NULL);
	KASSERT(m != NULL);

	/*
	 * Ship a packet out. The appropriate raw output
	 * routine handles any messaging necessary.
	 */

	/* always copy sockaddr to avoid overwrites */
	if (so->so_state & SS_ISCONNECTED) {
		if (nam) {
			error = EISCONN;
			goto release;
		}
		/* XXX */
		sockaddr_in6_init(&tmp, &in6p->in6p_faddr, 0, 0, 0);
		dst = &tmp;
	} else {
		if (nam == NULL) {
			error = ENOTCONN;
			goto release;
		}
		tmp = *(struct sockaddr_in6 *)nam;
		dst = &tmp;

		if (dst->sin6_family != AF_INET6) {
			error = EAFNOSUPPORT;
			goto release;
		}
	}
	error = rip6_output(m, so, dst, control);
	m = NULL;

release:
	if (m)
		m_freem(m);

	return error;
}

static int
rip6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
{
	KASSERT(solocked(so));

	if (m)
	 	m_freem(m);

	return EOPNOTSUPP;
}

static int
rip6_purgeif(struct socket *so, struct ifnet *ifp)
{

	mutex_enter(softnet_lock);
	in6_pcbpurgeif0(&raw6cbtable, ifp);
#ifdef NET_MPSAFE
	mutex_exit(softnet_lock);
#endif
	in6_purgeif(ifp);
#ifdef NET_MPSAFE
	mutex_enter(softnet_lock);
#endif
	in6_pcbpurgeif(&raw6cbtable, ifp);
	mutex_exit(softnet_lock);

	return 0;
}

static int
sysctl_net_inet6_raw6_stats(SYSCTLFN_ARGS)
{

	return (NETSTAT_SYSCTL(rip6stat_percpu, RIP6_NSTATS));
}

static void
sysctl_net_inet6_raw6_setup(struct sysctllog **clog)
{

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "inet6", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET6, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "raw6",
		       SYSCTL_DESCR("Raw IPv6 settings"),
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET6, IPPROTO_RAW, CTL_EOL);

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRUCT, "pcblist",
		       SYSCTL_DESCR("Raw IPv6 control block list"),
		       sysctl_inpcblist, 0, &raw6cbtable, 0,
		       CTL_NET, PF_INET6, IPPROTO_RAW,
		       CTL_CREATE, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRUCT, "stats",
		       SYSCTL_DESCR("Raw IPv6 statistics"),
		       sysctl_net_inet6_raw6_stats, 0, NULL, 0,
		       CTL_NET, PF_INET6, IPPROTO_RAW, RAW6CTL_STATS,
		       CTL_EOL);
}

PR_WRAP_USRREQS(rip6)
#define	rip6_attach		rip6_attach_wrapper
#define	rip6_detach		rip6_detach_wrapper
#define	rip6_accept		rip6_accept_wrapper
#define	rip6_bind		rip6_bind_wrapper
#define	rip6_listen		rip6_listen_wrapper
#define	rip6_connect		rip6_connect_wrapper
#define	rip6_connect2		rip6_connect2_wrapper
#define	rip6_disconnect		rip6_disconnect_wrapper
#define	rip6_shutdown		rip6_shutdown_wrapper
#define	rip6_abort		rip6_abort_wrapper
#define	rip6_ioctl		rip6_ioctl_wrapper
#define	rip6_stat		rip6_stat_wrapper
#define	rip6_peeraddr		rip6_peeraddr_wrapper
#define	rip6_sockaddr		rip6_sockaddr_wrapper
#define	rip6_rcvd		rip6_rcvd_wrapper
#define	rip6_recvoob		rip6_recvoob_wrapper
#define	rip6_send		rip6_send_wrapper
#define	rip6_sendoob		rip6_sendoob_wrapper
#define	rip6_purgeif		rip6_purgeif_wrapper

const struct pr_usrreqs rip6_usrreqs = {
	.pr_attach	= rip6_attach,
	.pr_detach	= rip6_detach,
	.pr_accept	= rip6_accept,
	.pr_bind	= rip6_bind,
	.pr_listen	= rip6_listen,
	.pr_connect	= rip6_connect,
	.pr_connect2	= rip6_connect2,
	.pr_disconnect	= rip6_disconnect,
	.pr_shutdown	= rip6_shutdown,
	.pr_abort	= rip6_abort,
	.pr_ioctl	= rip6_ioctl,
	.pr_stat	= rip6_stat,
	.pr_peeraddr	= rip6_peeraddr,
	.pr_sockaddr	= rip6_sockaddr,
	.pr_rcvd	= rip6_rcvd,
	.pr_recvoob	= rip6_recvoob,
	.pr_send	= rip6_send,
	.pr_sendoob	= rip6_sendoob,
	.pr_purgeif	= rip6_purgeif,
};