text: /*-
   * SPDX-License-Identifier: BSD-3-Clause
   *
   * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   * Copyright (c) 2008-2012, by Michael Tuexen. 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.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <netinet/sctp_os.h>
  #ifdef INET6
  #include <sys/proc.h>
  #include <netinet/sctp_pcb.h>
  #include <netinet/sctp_header.h>
  #include <netinet/sctp_var.h>
  #include <netinet6/sctp6_var.h>
  #include <netinet/sctp_sysctl.h>
  #include <netinet/sctp_output.h>
  #include <netinet/sctp_uio.h>
  #include <netinet/sctp_asconf.h>
  #include <netinet/sctputil.h>
  #include <netinet/sctp_indata.h>
  #include <netinet/sctp_timer.h>
  #include <netinet/sctp_auth.h>
  #include <netinet/sctp_input.h>
  #include <netinet/sctp_output.h>
  #include <netinet/sctp_bsd_addr.h>
  #include <netinet/sctp_crc32.h>
  #include <netinet/icmp6.h>
  #include <netinet/udp.h>
  
  int
  sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  {
  	struct mbuf *m;
  	int iphlen;
  	uint32_t vrf_id;
  	uint8_t ecn_bits;
  	struct sockaddr_in6 src, dst;
  	struct ip6_hdr *ip6;
  	struct sctphdr *sh;
  	struct sctp_chunkhdr *ch;
  	int length, offset;
  	uint8_t compute_crc;
  	uint32_t mflowid;
  	uint8_t mflowtype;
  	uint16_t fibnum;
  
  	iphlen = *offp;
  	if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  		SCTP_RELEASE_PKT(*i_pak);
  		return (IPPROTO_DONE);
  	}
  	m = SCTP_HEADER_TO_CHAIN(*i_pak);
  #ifdef SCTP_MBUF_LOGGING
  	/* Log in any input mbufs */
  	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  		sctp_log_mbc(m, SCTP_MBUF_INPUT);
  	}
  #endif
  #ifdef SCTP_PACKET_LOGGING
  	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  		sctp_packet_log(m);
  	}
  #endif
  	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  	    "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  	    m->m_pkthdr.len,
  	    if_name(m->m_pkthdr.rcvif),
  	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  	mflowid = m->m_pkthdr.flowid;
  	mflowtype = M_HASHTYPE_GET(m);
  	fibnum = M_GETFIB(m);
  	SCTP_STAT_INCR(sctps_recvpackets);
  	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
  	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  	if (m->m_len < offset) {
  		m = m_pullup(m, offset);
  		if (m == NULL) {
  			SCTP_STAT_INCR(sctps_hdrops);
  			return (IPPROTO_DONE);
  		}
  	}
  	ip6 = mtod(m, struct ip6_hdr *);
  	sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen);
  	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  	offset -= sizeof(struct sctp_chunkhdr);
  	memset(&src, 0, sizeof(struct sockaddr_in6));
  	src.sin6_family = AF_INET6;
  	src.sin6_len = sizeof(struct sockaddr_in6);
  	src.sin6_port = sh->src_port;
  	src.sin6_addr = ip6->ip6_src;
  	if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  		goto out;
  	}
  	memset(&dst, 0, sizeof(struct sockaddr_in6));
  	dst.sin6_family = AF_INET6;
  	dst.sin6_len = sizeof(struct sockaddr_in6);
  	dst.sin6_port = sh->dest_port;
  	dst.sin6_addr = ip6->ip6_dst;
  	if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  		goto out;
  	}
  	length = ntohs(ip6->ip6_plen) + iphlen;
  	/* Validate mbuf chain length with IP payload length. */
  	if (SCTP_HEADER_LEN(m) != length) {
  		SCTPDBG(SCTP_DEBUG_INPUT1,
  		    "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  		SCTP_STAT_INCR(sctps_hdrops);
  		goto out;
  	}
  	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  		goto out;
  	}
  	ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  	if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  		SCTP_STAT_INCR(sctps_recvhwcrc);
  		compute_crc = 0;
  	} else {
  		SCTP_STAT_INCR(sctps_recvswcrc);
  		compute_crc = 1;
  	}
  	sctp_common_input_processing(&m, iphlen, offset, length,
  	    (struct sockaddr *)&src,
  	    (struct sockaddr *)&dst,
  	    sh, ch,
  	    compute_crc,
  	    ecn_bits,
  	    mflowtype, mflowid, fibnum,
  	    vrf_id, port);
  out:
  	if (m) {
  		sctp_m_freem(m);
  	}
  	return (IPPROTO_DONE);
  }
  
  
  int
  sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  {
  	return (sctp6_input_with_port(i_pak, offp, 0));
  }
  
  void
  sctp6_notify(struct sctp_inpcb *inp,
      struct sctp_tcb *stcb,
      struct sctp_nets *net,
      uint8_t icmp6_type,
      uint8_t icmp6_code,
      uint32_t next_mtu)
  {
  #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  	struct socket *so;
  #endif
  	int timer_stopped;
  
  	switch (icmp6_type) {
  	case ICMP6_DST_UNREACH:
  		if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
  		    (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
  		    (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
  		    (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
  			/* Mark the net unreachable. */
  			if (net->dest_state & SCTP_ADDR_REACHABLE) {
  				/* Ok that destination is not reachable */
  				net->dest_state &= ~SCTP_ADDR_REACHABLE;
  				net->dest_state &= ~SCTP_ADDR_PF;
  				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  				    stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  			}
  		}
  		SCTP_TCB_UNLOCK(stcb);
  		break;
  	case ICMP6_PARAM_PROB:
  		/* Treat it like an ABORT. */
  		if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
  			sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  			so = SCTP_INP_SO(inp);
  			atomic_add_int(&stcb->asoc.refcnt, 1);
  			SCTP_TCB_UNLOCK(stcb);
  			SCTP_SOCKET_LOCK(so, 1);
  			SCTP_TCB_LOCK(stcb);
  			atomic_subtract_int(&stcb->asoc.refcnt, 1);
  #endif
  			(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
  			    SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  			SCTP_SOCKET_UNLOCK(so, 1);
  #endif
  		} else {
  			SCTP_TCB_UNLOCK(stcb);
  		}
  		break;
  	case ICMP6_PACKET_TOO_BIG:
  		if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
  			SCTP_TCB_UNLOCK(stcb);
  			break;
  		}
  		if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
  			timer_stopped = 1;
  			sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
  			    SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
  		} else {
  			timer_stopped = 0;
  		}
  		/* Update the path MTU. */
  		if (net->port) {
  			next_mtu -= sizeof(struct udphdr);
  		}
  		if (net->mtu > next_mtu) {
  			net->mtu = next_mtu;
  			if (net->port) {
  				sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
  			} else {
  				sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
  			}
  		}
  		/* Update the association MTU */
  		if (stcb->asoc.smallest_mtu > next_mtu) {
  			sctp_pathmtu_adjustment(stcb, next_mtu);
  		}
  		/* Finally, start the PMTU timer if it was running before. */
  		if (timer_stopped) {
  			sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
  		}
  		SCTP_TCB_UNLOCK(stcb);
  		break;
  	default:
  		SCTP_TCB_UNLOCK(stcb);
  		break;
  	}
  }
  
  void
  sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  {
  	struct ip6ctlparam *ip6cp;
  	struct sctp_inpcb *inp;
  	struct sctp_tcb *stcb;
  	struct sctp_nets *net;
  	struct sctphdr sh;
  	struct sockaddr_in6 src, dst;
  
  	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 != NULL) {
  		/*
  		 * XXX: We assume that when IPV6 is non NULL, M and OFF are
  		 * valid.
  		 */
  		if (ip6cp->ip6c_m == NULL) {
  			return;
  		}
  
  		/*
  		 * Check if we can safely examine the ports and the
  		 * verification tag of the SCTP common header.
  		 */
  		if (ip6cp->ip6c_m->m_pkthdr.len <
  		    (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
  			return;
  		}
  
  		/* Copy out the port numbers and the verification tag. */
  		memset(&sh, 0, sizeof(sh));
  		m_copydata(ip6cp->ip6c_m,
  		    ip6cp->ip6c_off,
  		    sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
  		    (caddr_t)&sh);
  		memset(&src, 0, sizeof(struct sockaddr_in6));
  		src.sin6_family = AF_INET6;
  		src.sin6_len = sizeof(struct sockaddr_in6);
  		src.sin6_port = sh.src_port;
  		src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
  		if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  			return;
  		}
  		memset(&dst, 0, sizeof(struct sockaddr_in6));
  		dst.sin6_family = AF_INET6;
  		dst.sin6_len = sizeof(struct sockaddr_in6);
  		dst.sin6_port = sh.dest_port;
  		dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
  		if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  			return;
  		}
  		inp = NULL;
  		net = NULL;
  		stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
  		    (struct sockaddr *)&src,
  		    &inp, &net, 1, SCTP_DEFAULT_VRFID);
  		if ((stcb != NULL) &&
  		    (net != NULL) &&
  		    (inp != NULL)) {
  			/* Check the verification tag */
  			if (ntohl(sh.v_tag) != 0) {
  				/*
  				 * This must be the verification tag used
  				 * for sending out packets. We don't
  				 * consider packets reflecting the
  				 * verification tag.
  				 */
  				if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
  					SCTP_TCB_UNLOCK(stcb);
  					return;
  				}
  			} else {
  				if (ip6cp->ip6c_m->m_pkthdr.len >=
  				    ip6cp->ip6c_off + sizeof(struct sctphdr) +
  				    sizeof(struct sctp_chunkhdr) +
  				    offsetof(struct sctp_init, a_rwnd)) {
  					/*
  					 * In this case we can check if we
  					 * got an INIT chunk and if the
  					 * initiate tag matches.
  					 */
  					uint32_t initiate_tag;
  					uint8_t chunk_type;
  
  					m_copydata(ip6cp->ip6c_m,
  					    ip6cp->ip6c_off +
  					    sizeof(struct sctphdr),
  					    sizeof(uint8_t),
  					    (caddr_t)&chunk_type);
  					m_copydata(ip6cp->ip6c_m,
  					    ip6cp->ip6c_off +
  					    sizeof(struct sctphdr) +
  					    sizeof(struct sctp_chunkhdr),
  					    sizeof(uint32_t),
  					    (caddr_t)&initiate_tag);
  					if ((chunk_type != SCTP_INITIATION) ||
  					    (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
  						SCTP_TCB_UNLOCK(stcb);
  						return;
  					}
  				} else {
  					SCTP_TCB_UNLOCK(stcb);
  					return;
  				}
  			}
  			sctp6_notify(inp, stcb, net,
  			    ip6cp->ip6c_icmp6->icmp6_type,
  			    ip6cp->ip6c_icmp6->icmp6_code,
  			    ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
  		} else {
  			if ((stcb == NULL) && (inp != NULL)) {
  				/* reduce inp's ref-count */
  				SCTP_INP_WLOCK(inp);
  				SCTP_INP_DECR_REF(inp);
  				SCTP_INP_WUNLOCK(inp);
  			}
  			if (stcb) {
  				SCTP_TCB_UNLOCK(stcb);
  			}
  		}
  	}
  }
  
  /*
   * 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 xucred xuc;
  	struct sockaddr_in6 addrs[2];
  	struct sctp_inpcb *inp;
  	struct sctp_nets *net;
  	struct sctp_tcb *stcb;
  	int error;
  	uint32_t vrf_id;
  
  	vrf_id = SCTP_DEFAULT_VRFID;
  
  	error = priv_check(req->td, PRIV_NETINET_GETCRED);
  	if (error)
  		return (error);
  
  	if (req->newlen != sizeof(addrs)) {
  		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  	if (req->oldlen != sizeof(struct ucred)) {
  		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  	error = SYSCTL_IN(req, addrs, sizeof(addrs));
  	if (error)
  		return (error);
  
  	stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  	    sin6tosa(&addrs[0]),
  	    &inp, &net, 1, vrf_id);
  	if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  		if ((inp != NULL) && (stcb == NULL)) {
  			/* reduce ref-count */
  			SCTP_INP_WLOCK(inp);
  			SCTP_INP_DECR_REF(inp);
  			goto cred_can_cont;
  		}
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  		error = ENOENT;
  		goto out;
  	}
  	SCTP_TCB_UNLOCK(stcb);
  	/*
  	 * We use the write lock here, only since in the error leg we need
  	 * it. If we used RLOCK, then we would have to
  	 * wlock/decr/unlock/rlock. Which in theory could create a hole.
  	 * Better to use higher wlock.
  	 */
  	SCTP_INP_WLOCK(inp);
  cred_can_cont:
  	error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  	if (error) {
  		SCTP_INP_WUNLOCK(inp);
  		goto out;
  	}
  	cru2x(inp->sctp_socket->so_cred, &xuc);
  	SCTP_INP_WUNLOCK(inp);
  	error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  out:
  	return (error);
  }
  
  SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
      CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
      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 epoch_tracker et;
  	struct sctp_inpcb *inp;
  	uint32_t flags;
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if (inp == NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return;
  	}
  	NET_EPOCH_ENTER(et);
  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, SCTP_FREE_SHOULD_USE_ABORT,
  		    SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  		SOCK_LOCK(so);
  		SCTP_SB_CLEAR(so->so_snd);
  		/*
  		 * same for the rcv ones, they are only here for the
  		 * accounting/select.
  		 */
  		SCTP_SB_CLEAR(so->so_rcv);
  		/* 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;
  		}
  	}
  	NET_EPOCH_EXIT(et);
  	return;
  }
  
  static int
  sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  {
  	int error;
  	struct sctp_inpcb *inp;
  	uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if (inp != NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  
  	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  		error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  		if (error)
  			return (error);
  	}
  	error = sctp_inpcb_alloc(so, vrf_id);
  	if (error)
  		return (error);
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	SCTP_INP_WLOCK(inp);
  	inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;	/* I'm v6! */
  
  	inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  	inp->ip_inp.inp.in6p_hops = -1;	/* use kernel default */
  	inp->ip_inp.inp.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.
  	 */
  	inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  #endif
  	SCTP_INP_WUNLOCK(inp);
  	return (0);
  }
  
  static int
  sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  {
  	struct sctp_inpcb *inp;
  	int error;
  	u_char vflagsav;
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if (inp == NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  
  	if (addr) {
  		switch (addr->sa_family) {
  #ifdef INET
  		case AF_INET:
  			if (addr->sa_len != sizeof(struct sockaddr_in)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  				return (EINVAL);
  			}
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  				return (EINVAL);
  			}
  			break;
  #endif
  		default:
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  	}
  	vflagsav = inp->ip_inp.inp.inp_vflag;
  	inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
  	inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  	if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
  		switch (addr->sa_family) {
  #ifdef INET
  		case AF_INET:
  			/* binding v4 addr to v6 socket, so reset flags */
  			inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  			inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			{
  				struct sockaddr_in6 *sin6_p;
  
  				sin6_p = (struct sockaddr_in6 *)addr;
  
  				if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  					inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  				}
  #ifdef INET
  				if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  					struct sockaddr_in sin;
  
  					in6_sin6_2_sin(&sin, sin6_p);
  					inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  					inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
  					error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  					goto out;
  				}
  #endif
  				break;
  			}
  #endif
  		default:
  			break;
  		}
  	} else if (addr != NULL) {
  		struct sockaddr_in6 *sin6_p;
  
  		/* IPV6_V6ONLY socket */
  #ifdef INET
  		if (addr->sa_family == AF_INET) {
  			/* can't bind v4 addr to v6 only socket! */
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			error = EINVAL;
  			goto out;
  		}
  #endif
  		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 */
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			error = EINVAL;
  			goto out;
  		}
  	}
  	error = sctp_inpcb_bind(so, addr, NULL, p);
  out:
  	if (error != 0)
  		inp->ip_inp.inp.inp_vflag = vflagsav;
  	return (error);
  }
  
  
  static void
  sctp6_close(struct socket *so)
  {
  	sctp_close(so);
  }
  
  /* This could be made common with sctp_detach() since they are identical */
  
  static
  int
  sctp6_disconnect(struct socket *so)
  {
  	return (sctp_disconnect(so));
  }
  
  
  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;
  
  #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) {
  			SCTP_RELEASE_PKT(control);
  			control = NULL;
  		}
  		SCTP_RELEASE_PKT(m);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  	/*
  	 * 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) {
  		SCTP_RELEASE_PKT(m);
  		if (control) {
  			SCTP_RELEASE_PKT(control);
  			control = NULL;
  		}
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  		return (EDESTADDRREQ);
  	}
  #ifdef INET
  	sin6 = (struct sockaddr_in6 *)addr;
  	if (SCTP_IPV6_V6ONLY(inp)) {
  		/*
  		 * if IPV6_V6ONLY flag, we discard datagrams destined to a
  		 * v4 addr or v4-mapped addr
  		 */
  		if (addr->sa_family == AF_INET) {
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  	}
  	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  		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));
  	}
  #endif				/* INET */
  connected_type:
  	/* now what about control */
  	if (control) {
  		if (inp->control) {
  			SCTP_PRINTF("huh? control set?\n");
  			SCTP_RELEASE_PKT(inp->control);
  			inp->control = NULL;
  		}
  		inp->control = control;
  	}
  	/* Place the data */
  	if (inp->pkt) {
  		SCTP_BUF_NEXT(inp->pkt_last) = 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.
  		 */
  		struct epoch_tracker et;
  		int ret;
  
  		NET_EPOCH_ENTER(et);
  		ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  		NET_EPOCH_EXIT(et);
  		inp->pkt = NULL;
  		inp->control = NULL;
  		return (ret);
  	} else {
  		return (0);
  	}
  }
  
  static int
  sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  {
  	struct epoch_tracker et;
  	uint32_t vrf_id;
  	int error = 0;
  	struct sctp_inpcb *inp;
  	struct sctp_tcb *stcb;
  #ifdef INET
  	struct sockaddr_in6 *sin6;
  	union sctp_sockstore store;
  #endif
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if (inp == NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  		return (ECONNRESET);	/* I made the same as TCP since we are
  					 * not setup? */
  	}
  	if (addr == NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  	switch (addr->sa_family) {
  #ifdef INET
  	case AF_INET:
  		if (addr->sa_len != sizeof(struct sockaddr_in)) {
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  		break;
  #endif
  	default:
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  
  	vrf_id = inp->def_vrf_id;
  	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) {
  			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 */
  		SCTP_INP_RUNLOCK(inp);
  		SCTP_ASOC_CREATE_UNLOCK(inp);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  		return (EADDRINUSE);
  	}
  #ifdef INET
  	sin6 = (struct sockaddr_in6 *)addr;
  	if (SCTP_IPV6_V6ONLY(inp)) {
  		/*
  		 * if IPV6_V6ONLY flag, ignore connections destined to a v4
  		 * addr or v4-mapped addr
  		 */
  		if (addr->sa_family == AF_INET) {
  			SCTP_INP_RUNLOCK(inp);
  			SCTP_ASOC_CREATE_UNLOCK(inp);
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  			SCTP_INP_RUNLOCK(inp);
  			SCTP_ASOC_CREATE_UNLOCK(inp);
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  			return (EINVAL);
  		}
  	}
  	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  		/* convert v4-mapped into v4 addr */
  		in6_sin6_2_sin(&store.sin, sin6);
  		addr = &store.sa;
  	}
  #endif				/* INET */
  	/* Now do we connect? */
  	if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  		stcb = LIST_FIRST(&inp->sctp_asoc_list);
  		if (stcb) {
  			SCTP_TCB_LOCK(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);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  		return (EALREADY);
  	}
  	/* We are GOOD to go */
  	stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
  	    inp->sctp_ep.pre_open_stream_count,
  	    inp->sctp_ep.port, p,
  	    SCTP_INITIALIZE_AUTH_PARAMS);
  	SCTP_ASOC_CREATE_UNLOCK(inp);
  	if (stcb == NULL) {
  		/* Gak! no memory */
  		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);
  	}
  	SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
  	(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  	NET_EPOCH_ENTER(et);
  	sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  	SCTP_TCB_UNLOCK(stcb);
  	NET_EPOCH_EXIT(et);
  	return (error);
  }
  
  static int
  sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  {
  	struct sockaddr_in6 *sin6;
  	struct sctp_inpcb *inp;
  	uint32_t vrf_id;
  	struct sctp_ifa *sctp_ifa;
  
  	int error;
  
  	/*
  	 * Do the malloc first in case it blocks.
  	 */
  	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
  	if (sin6 == NULL)
  		return (ENOMEM);
  	sin6->sin6_family = AF_INET6;
  	sin6->sin6_len = sizeof(*sin6);
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if (inp == NULL) {
  		SCTP_FREE_SONAME(sin6);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  		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) {
  				SCTP_INP_RUNLOCK(inp);
  				SCTP_FREE_SONAME(sin6);
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  				return (ENOENT);
  			}
  			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 == NULL)
  					/* this will make coverity happy */
  					continue;
  
  				if (sin_a6->sin6_family == AF_INET6) {
  					fnd = 1;
  					break;
  				}
  			}
  			if ((!fnd) || (sin_a6 == NULL)) {
  				/* punt */
  				SCTP_INP_RUNLOCK(inp);
  				SCTP_FREE_SONAME(sin6);
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  				return (ENOENT);
  			}
  			vrf_id = inp->def_vrf_id;
  			sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
  			if (sctp_ifa) {
  				sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
  			}
  		} else {
  			/* For the bound all case you get back 0 */
  			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->address.sa.sa_family == AF_INET6) {
  				struct sockaddr_in6 *sin_a;
  
  				sin_a = &laddr->ifa->address.sin6;
  				sin6->sin6_addr = sin_a->sin6_addr;
  				fnd = 1;
  				break;
  			}
  		}
  		if (!fnd) {
  			SCTP_FREE_SONAME(sin6);
  			SCTP_INP_RUNLOCK(inp);
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  			return (ENOENT);
  		}
  	}
  	SCTP_INP_RUNLOCK(inp);
  	/* Scoping things for v6 */
  	if ((error = sa6_recoverscope(sin6)) != 0) {
  		SCTP_FREE_SONAME(sin6);
  		return (error);
  	}
  	(*addr) = (struct sockaddr *)sin6;
  	return (0);
  }
  
  static int
  sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
  {
  	struct sockaddr_in6 *sin6;
  	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. */
  	SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
  	if (sin6 == NULL)
  		return (ENOMEM);
  	sin6->sin6_family = AF_INET6;
  	sin6->sin6_len = sizeof(*sin6);
  
  	inp = (struct sctp_inpcb *)so->so_pcb;
  	if ((inp == NULL) ||
  	    ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
  		/* UDP type and listeners will drop out here */
  		SCTP_FREE_SONAME(sin6);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
  		return (ENOTCONN);
  	}
  	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);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  		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);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  		return (ENOENT);
  	}
  	if ((error = sa6_recoverscope(sin6)) != 0) {
  		SCTP_FREE_SONAME(sin6);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
  		return (error);
  	}
  	*addr = (struct sockaddr *)sin6;
  	return (0);
  }
  
  static int
  sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
  {
  	struct inpcb *inp = sotoinpcb(so);
  	int error;
  
  	if (inp == NULL) {
  		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  
  	/* allow v6 addresses precedence */
  	error = sctp6_getaddr(so, nam);
  #ifdef INET
  	if (error) {
  		struct sockaddr_in6 *sin6;
  
  		/* try v4 next if v6 failed */
  		error = sctp_ingetaddr(so, nam);
  		if (error) {
  			return (error);
  		}
  		SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
  		if (sin6 == NULL) {
  			SCTP_FREE_SONAME(*nam);
  			return (ENOMEM);
  		}
  		in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
  		SCTP_FREE_SONAME(*nam);
  		*nam = (struct sockaddr *)sin6;
  	}
  #endif
  	return (error);
  }
  
  
  static int
  sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
  {
  	struct inpcb *inp = sotoinpcb(so);
  	int error;
  
  	if (inp == NULL) {
  		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  		return (EINVAL);
  	}
  
  	/* allow v6 addresses precedence */
  	error = sctp6_peeraddr(so, nam);
  #ifdef INET
  	if (error) {
  		struct sockaddr_in6 *sin6;
  
  		/* try v4 next if v6 failed */
  		error = sctp_peeraddr(so, nam);
  		if (error) {
  			return (error);
  		}
  		SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
  		if (sin6 == NULL) {
  			SCTP_FREE_SONAME(*nam);
  			return (ENOMEM);
  		}
  		in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
  		SCTP_FREE_SONAME(*nam);
  		*nam = (struct sockaddr *)sin6;
  	}
  #endif
  	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_flush = sctp_flush,
  	.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
  };
  
  #endif
  