Ok, here it is, we finally add SCTP to current. Note that this

work is not just mine, but it is also the works of Peter Lei
and Michael Tuexen. They both are my two key other developers
working on the project.. and they need ata-boy's too:
****
peterlei@cisco.com
tuexen@fh-muenster.de
****
I did do a make sysent which updated the
syscall's and sysproto.. I hope that is correct... without
it you don't build since we have new syscalls for SCTP :-0

So go out and look at the NOTES, add
option SCTP (make sure inet and inet6 are present too)
and play with SCTP.

I will see about comitting some test tools I have after I
figure out where I should place them. I also have a
lib (libsctp.a) that adds some of the missing socketapi
functions that I need to put into lib's.. I will talk
to George about this :-)

There may still be some 64 bit issues in here, none of
us have a 64 bit processor to test with yet.. Michael
may have a MAC but thats another beast too..

If you have a mac and want to use SCTP contact Michael
he maintains a web site with a loadable module with
this code :-)

Reviewed by:	gnn
Approved by:	gnn

1 files changed, 1370 insertions, 0 deletions

diff --git a/sys/netinet6/sctp6_usrreq.c b/sys/netinet6/sctp6_usrreq.c
new file mode 100644
index 0000000..2894a22
--- /dev/null
+++ b/sys/netinet6/sctp6_usrreq.c
@@ -0,0 +1,1370 @@
+/*-
+ * Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * b) 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.
+ *
+ * c) Neither the name of Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+/*	$KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $	*/
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include "opt_inet.h"
+#include "opt_ipsec.h"
+#include "opt_sctp.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/domain.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/malloc.h>
+#include <sys/socketvar.h>
+#include <sys/sysctl.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/syslog.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_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+#include <netinet/sctp_os.h>
+#include <netinet/sctp_pcb.h>
+#include <netinet/sctp_header.h>
+#include <netinet/sctp_var.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_output.h>
+#include <netinet/sctp_bsd_addr.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp_asconf.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/scope6_var.h>
+#include <netinet/sctp_bsd_addr.h>
+#include <netinet/ip6.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet/icmp6.h>
+#include <netinet6/sctp6_var.h>
+#include <netinet6/ip6protosw.h>
+#include <netinet6/nd6.h>
+
+#ifdef IPSEC
+#include <netinet6/ipsec.h>
+#endif				/* IPSEC */
+
+#if defined(NFAITH) && NFAITH > 0
+#include <net/if_faith.h>
+#endif
+
+
+
+extern struct protosw inetsw[];
+
+
+#ifndef in6pcb
+#define in6pcb		inpcb
+#endif
+#ifndef sotoin6pcb
+#define sotoin6pcb      sotoinpcb
+#endif
+
+
+#ifdef SCTP_DEBUG
+extern u_int32_t sctp_debug_on;
+
+#endif
+
+
+
+extern int sctp_no_csum_on_loopback;
+
+int
+sctp6_input(mp, offp, proto)
+	struct mbuf **mp;
+	int *offp;
+
+	int proto;
+
+{
+	struct mbuf *m = *mp;
+	struct ip6_hdr *ip6;
+	struct sctphdr *sh;
+	struct sctp_inpcb *in6p = NULL;
+	struct sctp_nets *net;
+	int refcount_up = 0;
+	u_int32_t check, calc_check;
+	struct inpcb *in6p_ip;
+	struct sctp_chunkhdr *ch;
+	int length, mlen, offset, iphlen;
+	u_int8_t ecn_bits;
+	struct sctp_tcb *stcb = NULL;
+	int off = *offp;
+	int s;
+
+	ip6 = mtod(m, struct ip6_hdr *);
+#ifndef PULLDOWN_TEST
+	/* If PULLDOWN_TEST off, must be in a single mbuf. */
+	IP6_EXTHDR_CHECK(m, off, (int)(sizeof(*sh) + sizeof(*ch)), IPPROTO_DONE);
+	sh = (struct sctphdr *)((caddr_t)ip6 + off);
+	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
+#else
+	/* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
+	IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, sizeof(*sh) + sizeof(*ch));
+	if (sh == NULL) {
+		SCTP_STAT_INCR(sctps_hdrops);
+		return IPPROTO_DONE;
+	}
+	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
+#endif
+
+	iphlen = off;
+	offset = iphlen + sizeof(*sh) + sizeof(*ch);
+
+#if defined(NFAITH) && NFAITH > 0
+
+	if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
+		/* XXX send icmp6 host/port unreach? */
+		goto bad;
+	}
+#endif				/* NFAITH defined and > 0 */
+	SCTP_STAT_INCR(sctps_recvpackets);
+	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
+#ifdef SCTP_DEBUG
+	if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
+		printf("V6 input gets a packet iphlen:%d pktlen:%d\n", iphlen, m->m_pkthdr.len);
+	}
+#endif
+	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+		/* No multi-cast support in SCTP */
+		goto bad;
+	}
+	/* destination port of 0 is illegal, based on RFC2960. */
+	if (sh->dest_port == 0)
+		goto bad;
+	if ((sctp_no_csum_on_loopback == 0) ||
+	    (m->m_pkthdr.rcvif == NULL) ||
+	    (m->m_pkthdr.rcvif->if_type != IFT_LOOP)) {
+		/*
+		 * we do NOT validate things from the loopback if the sysctl
+		 * is set to 1.
+		 */
+		check = sh->checksum;	/* save incoming checksum */
+		if ((check == 0) && (sctp_no_csum_on_loopback)) {
+			/*
+			 * special hook for where we got a local address
+			 * somehow routed across a non IFT_LOOP type
+			 * interface
+			 */
+			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))
+				goto sctp_skip_csum;
+		}
+		sh->checksum = 0;	/* prepare for calc */
+		calc_check = sctp_calculate_sum(m, &mlen, iphlen);
+		if (calc_check != check) {
+#ifdef SCTP_DEBUG
+			if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
+				printf("Bad CSUM on SCTP packet calc_check:%x check:%x  m:%x mlen:%d iphlen:%d\n",
+				    calc_check, check, (u_int)m,
+				    mlen, iphlen);
+			}
+#endif
+			stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
+			    sh, ch, &in6p, &net);
+			/* in6p's ref-count increased && stcb locked */
+			if ((in6p) && (stcb)) {
+				sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
+				sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, 2);
+			} else if ((in6p != NULL) && (stcb == NULL)) {
+				refcount_up = 1;
+			}
+			SCTP_STAT_INCR(sctps_badsum);
+			SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
+			goto bad;
+		}
+		sh->checksum = calc_check;
+	} else {
+sctp_skip_csum:
+		mlen = m->m_pkthdr.len;
+	}
+	net = NULL;
+	/*
+	 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
+	 * IP/SCTP/first chunk header...
+	 */
+	stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
+	    sh, ch, &in6p, &net);
+	/* in6p's ref-count increased */
+	if (in6p == NULL) {
+		struct sctp_init_chunk *init_chk, chunk_buf;
+
+		SCTP_STAT_INCR(sctps_noport);
+		if (ch->chunk_type == SCTP_INITIATION) {
+			/*
+			 * we do a trick here to get the INIT tag, dig in
+			 * and get the tag from the INIT and put it in the
+			 * common header.
+			 */
+			init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
+			    iphlen + sizeof(*sh), sizeof(*init_chk),
+			    (u_int8_t *) & chunk_buf);
+			sh->v_tag = init_chk->init.initiate_tag;
+		}
+		sctp_send_abort(m, iphlen, sh, 0, NULL);
+		goto bad;
+	} else if (stcb == NULL) {
+		refcount_up = 1;
+	}
+	in6p_ip = (struct inpcb *)in6p;
+#ifdef IPSEC
+	/*
+	 * Check AH/ESP integrity.
+	 */
+		if (in6p->sctp_socket && (ipsec6_in_reject_so(m, in6p->sctp_socket)) {
+/* XXX */
+		ipsec6stat.in_polvio++;
+		goto bad;
+		}
+#endif				/* IPSEC */
+
+
+	/*
+	 * CONTROL chunk processing
+	 */
+	length = ntohs(ip6->ip6_plen) + iphlen;
+	offset -= sizeof(*ch);
+	ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
+	s = splnet();
+	(void)sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
+	    in6p, stcb, net, ecn_bits);
+	/* inp's ref-count reduced && stcb unlocked */
+	splx(s);
+	/* XXX this stuff below gets moved to appropriate parts later... */
+	if (m)
+		m_freem(m);
+	if ((in6p) && refcount_up) {
+		/* reduce ref-count */
+		SCTP_INP_WLOCK(in6p);
+		SCTP_INP_DECR_REF(in6p);
+		SCTP_INP_WUNLOCK(in6p);
+	}
+	return IPPROTO_DONE;
+
+bad:
+	if (stcb)
+		SCTP_TCB_UNLOCK(stcb);
+
+	if ((in6p) && refcount_up) {
+		/* reduce ref-count */
+		SCTP_INP_WLOCK(in6p);
+		SCTP_INP_DECR_REF(in6p);
+		SCTP_INP_WUNLOCK(in6p);
+	}
+	if (m)
+		m_freem(m);
+	return IPPROTO_DONE;
+}
+
+
+static void
+sctp6_notify_mbuf(struct sctp_inpcb *inp,
+    struct icmp6_hdr *icmp6,
+    struct sctphdr *sh,
+    struct sctp_tcb *stcb,
+    struct sctp_nets *net)
+{
+	u_int32_t nxtsz;
+
+	if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
+	    (icmp6 == NULL) || (sh == NULL)) {
+		goto out;
+	}
+	/* First do we even look at it? */
+	if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
+		goto out;
+
+	if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
+		/* not PACKET TO BIG */
+		goto out;
+	}
+	/*
+	 * ok we need to look closely. We could even get smarter and look at
+	 * anyone that we sent to in case we get a different ICMP that tells
+	 * us there is no way to reach a host, but for this impl, all we
+	 * care about is MTU discovery.
+	 */
+	nxtsz = ntohl(icmp6->icmp6_mtu);
+	/* Stop any PMTU timer */
+	sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
+
+	/* Adjust destination size limit */
+	if (net->mtu > nxtsz) {
+		net->mtu = nxtsz;
+	}
+	/* now what about the ep? */
+	if (stcb->asoc.smallest_mtu > nxtsz) {
+		struct sctp_tmit_chunk *chk;
+
+		/* Adjust that too */
+		stcb->asoc.smallest_mtu = nxtsz;
+		/* now off to subtract IP_DF flag if needed */
+
+		TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
+			if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
+				chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
+			}
+		}
+		TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
+			if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
+				/*
+				 * For this guy we also mark for immediate
+				 * resend since we sent to big of chunk
+				 */
+				chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
+				if (chk->sent != SCTP_DATAGRAM_RESEND)
+					stcb->asoc.sent_queue_retran_cnt++;
+				chk->sent = SCTP_DATAGRAM_RESEND;
+				chk->rec.data.doing_fast_retransmit = 0;
+
+				chk->sent = SCTP_DATAGRAM_RESEND;
+				/* Clear any time so NO RTT is being done */
+				chk->sent_rcv_time.tv_sec = 0;
+				chk->sent_rcv_time.tv_usec = 0;
+				stcb->asoc.total_flight -= chk->send_size;
+				net->flight_size -= chk->send_size;
+			}
+		}
+	}
+	sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
+out:
+	if (stcb)
+		SCTP_TCB_UNLOCK(stcb);
+}
+
+
+void
+sctp6_ctlinput(cmd, pktdst, d)
+	int cmd;
+	struct sockaddr *pktdst;
+	void *d;
+{
+	struct sctphdr sh;
+	struct ip6ctlparam *ip6cp = NULL;
+	int s, cm;
+
+	if (pktdst->sa_family != AF_INET6 ||
+	    pktdst->sa_len != sizeof(struct sockaddr_in6))
+		return;
+
+	if ((unsigned)cmd >= PRC_NCMDS)
+		return;
+	if (PRC_IS_REDIRECT(cmd)) {
+		d = NULL;
+	} else if (inet6ctlerrmap[cmd] == 0) {
+		return;
+	}
+	/* if the parameter is from icmp6, decode it. */
+	if (d != NULL) {
+		ip6cp = (struct ip6ctlparam *)d;
+	} else {
+		ip6cp = (struct ip6ctlparam *)NULL;
+	}
+
+	if (ip6cp) {
+		/*
+		 * XXX: We assume that when IPV6 is non NULL, M and OFF are
+		 * valid.
+		 */
+		/* check if we can safely examine src and dst ports */
+		struct sctp_inpcb *inp = NULL;
+		struct sctp_tcb *stcb = NULL;
+		struct sctp_nets *net = NULL;
+		struct sockaddr_in6 final;
+
+		if (ip6cp->ip6c_m == NULL ||
+		    (size_t)ip6cp->ip6c_m->m_pkthdr.len < (ip6cp->ip6c_off + sizeof(sh)))
+			return;
+
+		bzero(&sh, sizeof(sh));
+		bzero(&final, sizeof(final));
+		inp = NULL;
+		net = NULL;
+		m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
+		    (caddr_t)&sh);
+		ip6cp->ip6c_src->sin6_port = sh.src_port;
+		final.sin6_len = sizeof(final);
+		final.sin6_family = AF_INET6;
+		final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
+		final.sin6_port = sh.dest_port;
+		s = splnet();
+		stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
+		    (struct sockaddr *)&final,
+		    &inp, &net, 1);
+		/* inp's ref-count increased && stcb locked */
+		if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
+			if (cmd == PRC_MSGSIZE) {
+				sctp6_notify_mbuf(inp,
+				    ip6cp->ip6c_icmp6,
+				    &sh,
+				    stcb,
+				    net);
+				/* inp's ref-count reduced && stcb unlocked */
+			} else {
+				if (cmd == PRC_HOSTDEAD) {
+					cm = EHOSTUNREACH;
+				} else {
+					cm = inet6ctlerrmap[cmd];
+				}
+				sctp_notify(inp, cm, &sh,
+				    (struct sockaddr *)&final,
+				    stcb, net);
+				/* inp's ref-count reduced && stcb unlocked */
+			}
+		} else {
+			if (PRC_IS_REDIRECT(cmd) && inp) {
+				in6_rtchange((struct in6pcb *)inp,
+				    inet6ctlerrmap[cmd]);
+			}
+			if (inp) {
+				/* reduce inp's ref-count */
+				SCTP_INP_WLOCK(inp);
+				SCTP_INP_DECR_REF(inp);
+				SCTP_INP_WUNLOCK(inp);
+			}
+			if (stcb)
+				SCTP_TCB_UNLOCK(stcb);
+		}
+		splx(s);
+	}
+}
+
+/*
+ * this routine can probably be collasped into the one in sctp_userreq.c
+ * since they do the same thing and now we lookup with a sockaddr
+ */
+static int
+sctp6_getcred(SYSCTL_HANDLER_ARGS)
+{
+	struct sockaddr_in6 addrs[2];
+	struct sctp_inpcb *inp;
+	struct sctp_nets *net;
+	struct sctp_tcb *stcb;
+	int error, s;
+
+	error = suser(req->td);
+	if (error)
+		return (error);
+
+	if (req->newlen != sizeof(addrs))
+		return (EINVAL);
+	if (req->oldlen != sizeof(struct ucred))
+		return (EINVAL);
+	error = SYSCTL_IN(req, addrs, sizeof(addrs));
+	if (error)
+		return (error);
+	s = splnet();
+
+	stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
+	    sin6tosa(&addrs[1]),
+	    &inp, &net, 1);
+	if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
+		error = ENOENT;
+		if (inp) {
+			SCTP_INP_WLOCK(inp);
+			SCTP_INP_DECR_REF(inp);
+			SCTP_INP_WUNLOCK(inp);
+		}
+		goto out;
+	}
+	error = SYSCTL_OUT(req, inp->sctp_socket->so_cred,
+	    sizeof(struct ucred));
+
+	SCTP_TCB_UNLOCK(stcb);
+out:
+	splx(s);
+	return (error);
+}
+
+SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
+    0, 0,
+    sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
+
+
+/* This is the same as the sctp_abort() could be made common */
+static void
+sctp6_abort(struct socket *so)
+{
+	struct sctp_inpcb *inp;
+	int s;
+	uint32_t flags;
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == 0)
+		return;
+	s = splnet();
+sctp_must_try_again:
+	flags = inp->sctp_flags;
+#ifdef SCTP_LOG_CLOSING
+	sctp_log_closing(inp, NULL, 17);
+#endif
+	if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
+	    (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
+#ifdef SCTP_LOG_CLOSING
+		sctp_log_closing(inp, NULL, 16);
+#endif
+		sctp_inpcb_free(inp, 1, 0);
+		SOCK_LOCK(so);
+		so->so_snd.sb_cc = 0;
+		so->so_snd.sb_mb = NULL;
+		so->so_snd.sb_mbcnt = 0;
+
+		/*
+		 * same for the rcv ones, they are only here for the
+		 * accounting/select.
+		 */
+		so->so_rcv.sb_cc = 0;
+		so->so_rcv.sb_mb = NULL;
+		so->so_rcv.sb_mbcnt = 0;
+		/*
+		 * Now null out the reference, we are completely detached.
+		 */
+		so->so_pcb = NULL;
+		SOCK_UNLOCK(so);
+	} else {
+		flags = inp->sctp_flags;
+		if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
+			goto sctp_must_try_again;
+		}
+	}
+	splx(s);
+	return;
+}
+
+static int
+sctp6_attach(struct socket *so, int proto, struct thread *p)
+{
+	struct in6pcb *inp6;
+	int s, error;
+	struct sctp_inpcb *inp;
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp != NULL)
+		return EINVAL;
+
+	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+		error = soreserve(so, sctp_sendspace, sctp_recvspace);
+		if (error)
+			return error;
+	}
+	s = splnet();
+	error = sctp_inpcb_alloc(so);
+	splx(s);
+	if (error)
+		return error;
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;	/* I'm v6! */
+	inp6 = (struct in6pcb *)inp;
+
+	inp6->inp_vflag |= INP_IPV6;
+	inp6->in6p_hops = -1;	/* use kernel default */
+	inp6->in6p_cksum = -1;	/* just to be sure */
+#ifdef INET
+	/*
+	 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
+	 * socket as well, because the socket may be bound to an IPv6
+	 * wildcard address, which may match an IPv4-mapped IPv6 address.
+	 */
+	inp6->inp_ip_ttl = ip_defttl;
+#endif
+	/*
+	 * Hmm what about the IPSEC stuff that is missing here but in
+	 * sctp_attach()?
+	 */
+	return 0;
+}
+
+static int
+sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
+{
+	struct sctp_inpcb *inp;
+	struct in6pcb *inp6;
+	int s, error;
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == 0)
+		return EINVAL;
+
+	inp6 = (struct in6pcb *)inp;
+	inp6->inp_vflag &= ~INP_IPV4;
+	inp6->inp_vflag |= INP_IPV6;
+	if (addr != NULL &&
+	    (inp6->inp_flags & IN6P_IPV6_V6ONLY)
+	    == 0) {
+		if (addr->sa_family == AF_INET) {
+			/* binding v4 addr to v6 socket, so reset flags */
+			inp6->inp_vflag |= INP_IPV4;
+			inp6->inp_vflag &= ~INP_IPV6;
+		} else {
+			struct sockaddr_in6 *sin6_p;
+
+			sin6_p = (struct sockaddr_in6 *)addr;
+
+			if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
+				inp6->inp_vflag |= INP_IPV4;
+			} else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
+				struct sockaddr_in sin;
+
+				in6_sin6_2_sin(&sin, sin6_p);
+				inp6->inp_vflag |= INP_IPV4;
+				inp6->inp_vflag &= ~INP_IPV6;
+				s = splnet();
+				error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, p);
+				splx(s);
+				return error;
+			}
+		}
+	} else if (addr != NULL) {
+		/* IPV6_V6ONLY socket */
+		if (addr->sa_family == AF_INET) {
+			/* can't bind v4 addr to v6 only socket! */
+			return EINVAL;
+		} else {
+			struct sockaddr_in6 *sin6_p;
+
+			sin6_p = (struct sockaddr_in6 *)addr;
+
+			if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr))
+				/* can't bind v4-mapped addrs either! */
+				/* NOTE: we don't support SIIT */
+				return EINVAL;
+		}
+	}
+	s = splnet();
+	error = sctp_inpcb_bind(so, addr, p);
+	splx(s);
+	return error;
+}
+
+
+static void
+sctp6_close(struct socket *so)
+{
+	struct sctp_inpcb *inp;
+	uint32_t flags;
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == 0)
+		return;
+
+	/*
+	 * Inform all the lower layer assoc that we are done.
+	 */
+sctp_must_try_again:
+	flags = inp->sctp_flags;
+#ifdef SCTP_LOG_CLOSING
+	sctp_log_closing(inp, NULL, 17);
+#endif
+	if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
+	    (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
+		if (((so->so_options & SO_LINGER) && (so->so_linger == 0)) ||
+		    (so->so_rcv.sb_cc > 0)) {
+#ifdef SCTP_LOG_CLOSING
+			sctp_log_closing(inp, NULL, 13);
+#endif
+			sctp_inpcb_free(inp, 1, 1);
+		} else {
+#ifdef SCTP_LOG_CLOSING
+			sctp_log_closing(inp, NULL, 14);
+#endif
+			sctp_inpcb_free(inp, 0, 1);
+		}
+		/*
+		 * The socket is now detached, no matter what the state of
+		 * the SCTP association.
+		 */
+		SOCK_LOCK(so);
+		so->so_snd.sb_cc = 0;
+		so->so_snd.sb_mb = NULL;
+		so->so_snd.sb_mbcnt = 0;
+
+		/*
+		 * same for the rcv ones, they are only here for the
+		 * accounting/select.
+		 */
+		so->so_rcv.sb_cc = 0;
+		so->so_rcv.sb_mb = NULL;
+		so->so_rcv.sb_mbcnt = 0;
+		/*
+		 * Now null out the reference, we are completely detached.
+		 */
+		so->so_pcb = NULL;
+		SOCK_UNLOCK(so);
+	} else {
+		flags = inp->sctp_flags;
+		if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
+			goto sctp_must_try_again;
+		}
+	}
+	return;
+
+}
+
+
+static int
+sctp6_disconnect(struct socket *so)
+{
+	struct sctp_inpcb *inp;
+	int s;
+
+	s = splnet();		/* XXX */
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == NULL) {
+		splx(s);
+		return (ENOTCONN);
+	}
+	SCTP_INP_RLOCK(inp);
+	if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
+		if (LIST_EMPTY(&inp->sctp_asoc_list)) {
+			/* No connection */
+			splx(s);
+			SCTP_INP_RUNLOCK(inp);
+			return (ENOTCONN);
+		} else {
+			int some_on_streamwheel = 0;
+			struct sctp_association *asoc;
+			struct sctp_tcb *stcb;
+
+			stcb = LIST_FIRST(&inp->sctp_asoc_list);
+			if (stcb == NULL) {
+				splx(s);
+				SCTP_INP_RUNLOCK(inp);
+				return (EINVAL);
+			}
+			SCTP_TCB_LOCK(stcb);
+			asoc = &stcb->asoc;
+			if (((so->so_options & SO_LINGER) &&
+			    (so->so_linger == 0)) ||
+			    (so->so_rcv.sb_cc > 0)) {
+				if (SCTP_GET_STATE(asoc) !=
+				    SCTP_STATE_COOKIE_WAIT) {
+					/* Left with Data unread */
+					struct mbuf *err;
+
+					err = NULL;
+					MGET(err, M_DONTWAIT, MT_DATA);
+					if (err) {
+						/*
+						 * Fill in the user
+						 * initiated abort
+						 */
+						struct sctp_paramhdr *ph;
+
+						ph = mtod(err, struct sctp_paramhdr *);
+						err->m_len = sizeof(struct sctp_paramhdr);
+						ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
+						ph->param_length = htons(err->m_len);
+					}
+					sctp_send_abort_tcb(stcb, err);
+					SCTP_STAT_INCR_COUNTER32(sctps_aborted);
+				}
+				SCTP_INP_RUNLOCK(inp);
+				if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
+				    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+				}
+				sctp_free_assoc(inp, stcb, 0);
+				/* No unlock tcb assoc is gone */
+				splx(s);
+				return (0);
+			}
+			if (!TAILQ_EMPTY(&asoc->out_wheel)) {
+				/* Check to see if some data queued */
+				struct sctp_stream_out *outs;
+
+				TAILQ_FOREACH(outs, &asoc->out_wheel,
+				    next_spoke) {
+					if (!TAILQ_EMPTY(&outs->outqueue)) {
+						some_on_streamwheel = 1;
+						break;
+					}
+				}
+			}
+			if (TAILQ_EMPTY(&asoc->send_queue) &&
+			    TAILQ_EMPTY(&asoc->sent_queue) &&
+			    (some_on_streamwheel == 0)) {
+				/* nothing queued to send, so I'm done... */
+				if ((SCTP_GET_STATE(asoc) !=
+				    SCTP_STATE_SHUTDOWN_SENT) &&
+				    (SCTP_GET_STATE(asoc) !=
+				    SCTP_STATE_SHUTDOWN_ACK_SENT)) {
+					/* only send SHUTDOWN the first time */
+					sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
+					sctp_chunk_output(stcb->sctp_ep, stcb, 1);
+					asoc->state = SCTP_STATE_SHUTDOWN_SENT;
+					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
+					    stcb->sctp_ep, stcb,
+					    asoc->primary_destination);
+					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+					    stcb->sctp_ep, stcb,
+					    asoc->primary_destination);
+				}
+			} else {
+				/*
+				 * we still got (or just got) data to send,
+				 * so set SHUTDOWN_PENDING
+				 */
+				/*
+				 * XXX sockets draft says that MSG_EOF
+				 * should be sent with no data.  currently,
+				 * we will allow user data to be sent first
+				 * and move to SHUTDOWN-PENDING
+				 */
+				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
+			}
+			SCTP_TCB_UNLOCK(stcb);
+			SCTP_INP_RUNLOCK(inp);
+			splx(s);
+			return (0);
+		}
+	} else {
+		/* UDP model does not support this */
+		SCTP_INP_RUNLOCK(inp);
+		splx(s);
+		return EOPNOTSUPP;
+	}
+}
+
+int
+sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
+    struct mbuf *control, struct thread *p);
+
+
+
+static int
+sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
+    struct mbuf *control, struct thread *p)
+{
+	struct sctp_inpcb *inp;
+	struct inpcb *in_inp;
+	struct in6pcb *inp6;
+
+#ifdef INET
+	struct sockaddr_in6 *sin6;
+
+#endif				/* INET */
+	/* No SPL needed since sctp_output does this */
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == NULL) {
+		if (control) {
+			m_freem(control);
+			control = NULL;
+		}
+		m_freem(m);
+		return EINVAL;
+	}
+	in_inp = (struct inpcb *)inp;
+	inp6 = (struct in6pcb *)inp;
+	/*
+	 * For the TCP model we may get a NULL addr, if we are a connected
+	 * socket thats ok.
+	 */
+	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
+	    (addr == NULL)) {
+		goto connected_type;
+	}
+	if (addr == NULL) {
+		m_freem(m);
+		if (control) {
+			m_freem(control);
+			control = NULL;
+		}
+		return (EDESTADDRREQ);
+	}
+#ifdef INET
+	sin6 = (struct sockaddr_in6 *)addr;
+	if (
+
+	    (inp6->inp_flags & IN6P_IPV6_V6ONLY)
+	    ) {
+		/*
+		 * if IPV6_V6ONLY flag, we discard datagrams destined to a
+		 * v4 addr or v4-mapped addr
+		 */
+		if (addr->sa_family == AF_INET) {
+			return EINVAL;
+		}
+		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+			return EINVAL;
+		}
+	}
+	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+		if (!ip6_v6only) {
+			struct sockaddr_in sin;
+
+			/* convert v4-mapped into v4 addr and send */
+			in6_sin6_2_sin(&sin, sin6);
+			return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
+			    control, p);
+		} else {
+			/* mapped addresses aren't enabled */
+			return EINVAL;
+		}
+	}
+#endif				/* INET */
+connected_type:
+	/* now what about control */
+	if (control) {
+		if (inp->control) {
+			printf("huh? control set?\n");
+			m_freem(inp->control);
+			inp->control = NULL;
+		}
+		inp->control = control;
+	}
+	/* add it in possibly */
+	if ((inp->pkt) &&
+	    (inp->pkt->m_flags & M_PKTHDR)) {
+		struct mbuf *x;
+		int c_len;
+
+		c_len = 0;
+		/* How big is it */
+		for (x = m; x; x = x->m_next) {
+			c_len += x->m_len;
+		}
+		inp->pkt->m_pkthdr.len += c_len;
+	}
+	/* Place the data */
+	if (inp->pkt) {
+		inp->pkt_last->m_next = m;
+		inp->pkt_last = m;
+	} else {
+		inp->pkt_last = inp->pkt = m;
+	}
+	if (
+	/* FreeBSD and MacOSX uses a flag passed */
+	    ((flags & PRUS_MORETOCOME) == 0)
+	    ) {
+		/*
+		 * note with the current version this code will only be used
+		 * by OpenBSD, NetBSD and FreeBSD have methods for
+		 * re-defining sosend() to use sctp_sosend().  One can
+		 * optionaly switch back to this code (by changing back the
+		 * defininitions but this is not advisable.
+		 */
+		int ret;
+
+		ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
+		inp->pkt = NULL;
+		inp->control = NULL;
+		return (ret);
+	} else {
+		return (0);
+	}
+}
+
+static int
+sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
+{
+	int s = splnet();
+
+	int error = 0;
+	struct sctp_inpcb *inp;
+	struct in6pcb *inp6;
+	struct sctp_tcb *stcb;
+
+#ifdef INET
+	struct sockaddr_in6 *sin6;
+	struct sockaddr_storage ss;
+
+#endif				/* INET */
+
+	inp6 = (struct in6pcb *)so->so_pcb;
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == 0) {
+		splx(s);
+		return (ECONNRESET);	/* I made the same as TCP since we are
+					 * not setup? */
+	}
+	SCTP_ASOC_CREATE_LOCK(inp);
+	SCTP_INP_RLOCK(inp);
+	if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
+	    SCTP_PCB_FLAGS_UNBOUND) {
+		/* Bind a ephemeral port */
+		SCTP_INP_RUNLOCK(inp);
+		error = sctp6_bind(so, NULL, p);
+		if (error) {
+			splx(s);
+			SCTP_ASOC_CREATE_UNLOCK(inp);
+
+			return (error);
+		}
+		SCTP_INP_RLOCK(inp);
+	}
+	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
+	    (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
+		/* We are already connected AND the TCP model */
+		splx(s);
+		SCTP_INP_RUNLOCK(inp);
+		SCTP_ASOC_CREATE_UNLOCK(inp);
+		return (EADDRINUSE);
+	}
+#ifdef INET
+	sin6 = (struct sockaddr_in6 *)addr;
+	if (
+	    (inp6->inp_flags & IN6P_IPV6_V6ONLY)
+	    ) {
+		/*
+		 * if IPV6_V6ONLY flag, ignore connections destined to a v4
+		 * addr or v4-mapped addr
+		 */
+		if (addr->sa_family == AF_INET) {
+			splx(s);
+			SCTP_INP_RUNLOCK(inp);
+			SCTP_ASOC_CREATE_UNLOCK(inp);
+			return EINVAL;
+		}
+		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+			splx(s);
+			SCTP_INP_RUNLOCK(inp);
+			SCTP_ASOC_CREATE_UNLOCK(inp);
+			return EINVAL;
+		}
+	}
+	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+		if (!ip6_v6only) {
+			/* convert v4-mapped into v4 addr */
+			in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
+			addr = (struct sockaddr *)&ss;
+		} else {
+			/* mapped addresses aren't enabled */
+			splx(s);
+			SCTP_INP_RUNLOCK(inp);
+			SCTP_ASOC_CREATE_UNLOCK(inp);
+			return EINVAL;
+		}
+	} else
+#endif				/* INET */
+		addr = addr;	/* for true v6 address case */
+
+	/* Now do we connect? */
+	if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
+		stcb = LIST_FIRST(&inp->sctp_asoc_list);
+		if (stcb)
+			SCTP_TCB_UNLOCK(stcb);
+		SCTP_INP_RUNLOCK(inp);
+	} else {
+		SCTP_INP_RUNLOCK(inp);
+		SCTP_INP_WLOCK(inp);
+		SCTP_INP_INCR_REF(inp);
+		SCTP_INP_WUNLOCK(inp);
+		stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
+		if (stcb == NULL) {
+			SCTP_INP_WLOCK(inp);
+			SCTP_INP_DECR_REF(inp);
+			SCTP_INP_WUNLOCK(inp);
+		}
+	}
+
+	if (stcb != NULL) {
+		/* Already have or am bring up an association */
+		SCTP_ASOC_CREATE_UNLOCK(inp);
+		SCTP_TCB_UNLOCK(stcb);
+		splx(s);
+		return (EALREADY);
+	}
+	/* We are GOOD to go */
+	stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0);
+	SCTP_ASOC_CREATE_UNLOCK(inp);
+	if (stcb == NULL) {
+		/* Gak! no memory */
+		splx(s);
+		return (error);
+	}
+	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
+		stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
+		/* Set the connected flag so we can queue data */
+		soisconnecting(so);
+	}
+	stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
+	SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
+
+	/* initialize authentication parameters for the assoc */
+	sctp_initialize_auth_params(inp, stcb);
+
+	sctp_send_initiate(inp, stcb);
+	SCTP_TCB_UNLOCK(stcb);
+	splx(s);
+	return error;
+}
+
+static int
+sctp6_getaddr(struct socket *so, struct sockaddr **addr)
+{
+	struct sockaddr_in6 *sin6;
+
+	struct sctp_inpcb *inp;
+
+	int error;
+
+
+	/*
+	 * Do the malloc first in case it blocks.
+	 */
+	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
+	sin6->sin6_family = AF_INET6;
+	sin6->sin6_len = sizeof(*sin6);
+
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == NULL) {
+		SCTP_FREE_SONAME(sin6);
+		return ECONNRESET;
+	}
+	SCTP_INP_RLOCK(inp);
+	sin6->sin6_port = inp->sctp_lport;
+	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
+		/* For the bound all case you get back 0 */
+		if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
+			struct sctp_tcb *stcb;
+			struct sockaddr_in6 *sin_a6;
+			struct sctp_nets *net;
+			int fnd;
+
+			stcb = LIST_FIRST(&inp->sctp_asoc_list);
+			if (stcb == NULL) {
+				goto notConn6;
+			}
+			fnd = 0;
+			sin_a6 = NULL;
+			TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+				sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
+				if (sin_a6->sin6_family == AF_INET6) {
+					fnd = 1;
+					break;
+				}
+			}
+			if ((!fnd) || (sin_a6 == NULL)) {
+				/* punt */
+				goto notConn6;
+			}
+			sin6->sin6_addr = sctp_ipv6_source_address_selection(
+			    inp, stcb, (struct route *)&net->ro, net, 0);
+
+		} else {
+			/* For the bound all case you get back 0 */
+	notConn6:
+			memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
+		}
+	} else {
+		/* Take the first IPv6 address in the list */
+		struct sctp_laddr *laddr;
+		int fnd = 0;
+
+		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
+			if (laddr->ifa->ifa_addr->sa_family == AF_INET6) {
+				struct sockaddr_in6 *sin_a;
+
+				sin_a = (struct sockaddr_in6 *)laddr->ifa->ifa_addr;
+				sin6->sin6_addr = sin_a->sin6_addr;
+				fnd = 1;
+				break;
+			}
+		}
+		if (!fnd) {
+			SCTP_FREE_SONAME(sin6);
+			SCTP_INP_RUNLOCK(inp);
+			return ENOENT;
+		}
+	}
+	SCTP_INP_RUNLOCK(inp);
+	/* Scoping things for v6 */
+	if ((error = sa6_recoverscope(sin6)) != 0)
+		return (error);
+	(*addr) = (struct sockaddr *)sin6;
+	return (0);
+}
+
+static int
+sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
+{
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
+
+	int fnd;
+	struct sockaddr_in6 *sin_a6;
+	struct sctp_inpcb *inp;
+	struct sctp_tcb *stcb;
+	struct sctp_nets *net;
+
+	int error;
+
+
+	/*
+	 * Do the malloc first in case it blocks.
+	 */
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
+		/* UDP type and listeners will drop out here */
+		return (ENOTCONN);
+	}
+	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
+	sin6->sin6_family = AF_INET6;
+	sin6->sin6_len = sizeof(*sin6);
+
+	/* We must recapture incase we blocked */
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp == NULL) {
+		SCTP_FREE_SONAME(sin6);
+		return ECONNRESET;
+	}
+	SCTP_INP_RLOCK(inp);
+	stcb = LIST_FIRST(&inp->sctp_asoc_list);
+	if (stcb)
+		SCTP_TCB_LOCK(stcb);
+	SCTP_INP_RUNLOCK(inp);
+	if (stcb == NULL) {
+		SCTP_FREE_SONAME(sin6);
+		return ECONNRESET;
+	}
+	fnd = 0;
+	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+		sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
+		if (sin_a6->sin6_family == AF_INET6) {
+			fnd = 1;
+			sin6->sin6_port = stcb->rport;
+			sin6->sin6_addr = sin_a6->sin6_addr;
+			break;
+		}
+	}
+	SCTP_TCB_UNLOCK(stcb);
+	if (!fnd) {
+		/* No IPv4 address */
+		SCTP_FREE_SONAME(sin6);
+		return ENOENT;
+	}
+	if ((error = sa6_recoverscope(sin6)) != 0)
+		return (error);
+	*addr = (struct sockaddr *)sin6;
+	return (0);
+}
+
+static int
+sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
+{
+	struct sockaddr *addr;
+
+	struct in6pcb *inp6 = sotoin6pcb(so);
+	int error, s;
+
+	if (inp6 == NULL)
+		return EINVAL;
+
+	s = splnet();
+	/* allow v6 addresses precedence */
+	error = sctp6_getaddr(so, nam);
+	if (error) {
+		/* try v4 next if v6 failed */
+		error = sctp_ingetaddr(so, nam);
+		if (error) {
+			splx(s);
+			return (error);
+		}
+		addr = *nam;
+		/* if I'm V6ONLY, convert it to v4-mapped */
+		if (
+		    (inp6->inp_flags & IN6P_IPV6_V6ONLY)
+		    ) {
+			struct sockaddr_in6 sin6;
+
+			in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
+			memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
+		}
+	}
+	splx(s);
+	return (error);
+}
+
+
+static int
+sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
+{
+	struct sockaddr *addr = *nam;
+
+	struct in6pcb *inp6 = sotoin6pcb(so);
+	int error, s;
+
+	if (inp6 == NULL)
+		return EINVAL;
+
+	s = splnet();
+	/* allow v6 addresses precedence */
+	error = sctp6_peeraddr(so, nam);
+	if (error) {
+		/* try v4 next if v6 failed */
+		error = sctp_peeraddr(so, nam);
+		if (error) {
+			splx(s);
+			return (error);
+		}
+		/* if I'm V6ONLY, convert it to v4-mapped */
+		if (
+		    (inp6->inp_flags & IN6P_IPV6_V6ONLY)
+		    ) {
+			struct sockaddr_in6 sin6;
+
+			in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
+			memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
+		}
+	}
+	splx(s);
+	return error;
+}
+
+struct pr_usrreqs sctp6_usrreqs = {
+	.pru_abort = sctp6_abort,
+	.pru_accept = sctp_accept,
+	.pru_attach = sctp6_attach,
+	.pru_bind = sctp6_bind,
+	.pru_connect = sctp6_connect,
+	.pru_control = in6_control,
+	.pru_close = sctp6_close,
+	.pru_detach = sctp6_close,
+	.pru_sopoll = sopoll_generic,
+	.pru_disconnect = sctp6_disconnect,
+	.pru_listen = sctp_listen,
+	.pru_peeraddr = sctp6_getpeeraddr,
+	.pru_send = sctp6_send,
+	.pru_shutdown = sctp_shutdown,
+	.pru_sockaddr = sctp6_in6getaddr,
+	.pru_sosend = sctp_sosend,
+	.pru_soreceive = sctp_soreceive
+};