The Tor Browser: comparison netwerk/sctp/src/user

--1:000000000000
+:e2a67673502b
+/*-
+* Copyright (c) 1982, 1986, 1988, 1990, 1993
+*      The Regents of the University of California.
+* Copyright (c) 2004 The FreeBSD Foundation
+* Copyright (c) 2004-2008 Robert N. M. Watson
+* Copyright (c) 2009-2010 Brad Penoff
+* Copyright (c) 2009-2010 Humaira Kamal
+* Copyright (c) 2011-2012 Irene Ruengeler
+* Copyright (c) 2011-2012 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:
+* 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.
+*
+* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <netinet/sctp_os.h>
+#include <netinet/sctp_pcb.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_var.h>
+#include <netinet/sctp_sysctl.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp_peeloff.h>
+#ifdef INET6
+#include <netinet6/sctp6_var.h>
+#endif
+#if defined(__Userspace_os_Linux)
+#define __FAVOR_BSD    /* (on Ubuntu at least) enables UDP header field names like BSD in RFC 768 */
+#endif
+#if !defined (__Userspace_os_Windows)
+#include <netinet/udp.h>
+#include <arpa/inet.h>
+#else
+#include <user_socketvar.h>
+#endif
+userland_mutex_t accept_mtx;
+userland_cond_t accept_cond;
+#ifdef _WIN32
+#include <time.h>
+#include <sys/timeb.h>
+#endif
+MALLOC_DEFINE(M_PCB, "sctp_pcb", "sctp pcb");
+MALLOC_DEFINE(M_SONAME, "sctp_soname", "sctp soname");
+#define MAXLEN_MBUF_CHAIN  32
+/* Prototypes */
+extern int sctp_sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
+struct mbuf *top, struct mbuf *control, int flags,
+/* proc is a dummy in __Userspace__ and will not be passed to sctp_lower_sosend */                       struct proc *p);
+extern int sctp_attach(struct socket *so, int proto, uint32_t vrf_id);
+extern int sctpconn_attach(struct socket *so, int proto, uint32_t vrf_id);
+void
+usrsctp_init(uint16_t port,
+int (*conn_output)(void *addr, void *buffer, size_t length, uint8_t tos, uint8_t set_df),
+void (*debug_printf)(const char *format, ...))
+{
+	sctp_init(port, conn_output, debug_printf);
+}
+/* Taken from  usr/src/sys/kern/uipc_sockbuf.c and modified for __Userspace__*/
+/*
+* Socantsendmore indicates that no more data will be sent on the socket; it
+* would normally be applied to a socket when the user informs the system
+* that no more data is to be sent, by the protocol code (in case
+* PRU_SHUTDOWN).  Socantrcvmore indicates that no more data will be
+* received, and will normally be applied to the socket by a protocol when it
+* detects that the peer will send no more data.  Data queued for reading in
+* the socket may yet be read.
+*/
+void socantrcvmore_locked(struct socket *so)
+{
+	SOCKBUF_LOCK_ASSERT(&so->so_rcv);
+	so->so_rcv.sb_state |= SBS_CANTRCVMORE;
+	sorwakeup_locked(so);
+}
+void socantrcvmore(struct socket *so)
+{
+	SOCKBUF_LOCK(&so->so_rcv);
+	socantrcvmore_locked(so);
+}
+void
+socantsendmore_locked(struct socket *so)
+{
+	SOCKBUF_LOCK_ASSERT(&so->so_snd);
+	so->so_snd.sb_state |= SBS_CANTSENDMORE;
+	sowwakeup_locked(so);
+}
+void
+socantsendmore(struct socket *so)
+{
+	SOCKBUF_LOCK(&so->so_snd);
+	socantsendmore_locked(so);
+}
+/* Taken from  usr/src/sys/kern/uipc_sockbuf.c and called within sctp_lower_sosend.
+*/
+int
+sbwait(struct sockbuf *sb)
+{
+#if defined(__Userspace__) /* __Userspace__ */
+	SOCKBUF_LOCK_ASSERT(sb);
+	sb->sb_flags |= SB_WAIT;
+#if defined (__Userspace_os_Windows)
+	if (SleepConditionVariableCS(&(sb->sb_cond), &(sb->sb_mtx), INFINITE))
+		return 0;
+	else
+		return -1;
+#else
+	return (pthread_cond_wait(&(sb->sb_cond), &(sb->sb_mtx)));
+#endif
+#else
+	SOCKBUF_LOCK_ASSERT(sb);
+	sb->sb_flags |= SB_WAIT;
+	return (msleep(&sb->sb_cc, &sb->sb_mtx,
+	    (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait",
+	    sb->sb_timeo));
+#endif
+}
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+*/
+static struct socket *
+soalloc(void)
+{
+	struct socket *so;
+	/*
+	 * soalloc() sets of socket layer state for a socket,
+	 * called only by socreate() and sonewconn().
+	 *
+	 * sodealloc() tears down socket layer state for a socket,
+	 * called only by sofree() and sonewconn().
+	 * __Userspace__ TODO : Make sure so is properly deallocated
+	 * when tearing down the connection.
+	 */
+	so = (struct socket *)malloc(sizeof(struct socket));
+	if (so == NULL) {
+		return (NULL);
+	}
+	memset(so, 0, sizeof(struct socket));
+	/* __Userspace__ Initializing the socket locks here */
+	SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
+	SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
+	SOCKBUF_COND_INIT(&so->so_snd);
+	SOCKBUF_COND_INIT(&so->so_rcv);
+	SOCK_COND_INIT(so); /* timeo_cond */
+	/* __Userspace__ Any ref counting required here? Will we have any use for aiojobq?
+	   What about gencnt and numopensockets?*/
+	TAILQ_INIT(&so->so_aiojobq);
+	return (so);
+}
+static void
+sodealloc(struct socket *so)
+{
+	KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
+	KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));
+	SOCKBUF_COND_DESTROY(&so->so_snd);
+	SOCKBUF_COND_DESTROY(&so->so_rcv);
+	SOCK_COND_DESTROY(so);
+	SOCKBUF_LOCK_DESTROY(&so->so_snd);
+	SOCKBUF_LOCK_DESTROY(&so->so_rcv);
+	free(so);
+}
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+*/
+void
+sofree(struct socket *so)
+{
+	struct socket *head;
+	ACCEPT_LOCK_ASSERT();
+	SOCK_LOCK_ASSERT(so);
+	/* SS_NOFDREF unset in accept call.  this condition seems irrelevent
+	 *  for __Userspace__...
+	 */
+	if (so->so_count != 0 ||
+	    (so->so_state & SS_PROTOREF) || (so->so_qstate & SQ_COMP)) {
+		SOCK_UNLOCK(so);
+		ACCEPT_UNLOCK();
+		return;
+	}
+	head = so->so_head;
+	if (head != NULL) {
+		KASSERT((so->so_qstate & SQ_COMP) != 0 ||
+		    (so->so_qstate & SQ_INCOMP) != 0,
+		    ("sofree: so_head != NULL, but neither SQ_COMP nor "
+		    "SQ_INCOMP"));
+		KASSERT((so->so_qstate & SQ_COMP) == 0 ||
+		    (so->so_qstate & SQ_INCOMP) == 0,
+		    ("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
+		TAILQ_REMOVE(&head->so_incomp, so, so_list);
+		head->so_incqlen--;
+		so->so_qstate &= ~SQ_INCOMP;
+		so->so_head = NULL;
+	}
+	KASSERT((so->so_qstate & SQ_COMP) == 0 &&
+	    (so->so_qstate & SQ_INCOMP) == 0,
+	    ("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
+	    so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
+	if (so->so_options & SCTP_SO_ACCEPTCONN) {
+		KASSERT((TAILQ_EMPTY(&so->so_comp)), ("sofree: so_comp populated"));
+		KASSERT((TAILQ_EMPTY(&so->so_incomp)), ("sofree: so_comp populated"));
+	}
+	SOCK_UNLOCK(so);
+	ACCEPT_UNLOCK();
+	sctp_close(so); /* was...    sctp_detach(so); */
+	/*
+	 * From this point on, we assume that no other references to this
+	 * socket exist anywhere else in the stack.  Therefore, no locks need
+	 * to be acquired or held.
+	 *
+	 * We used to do a lot of socket buffer and socket locking here, as
+	 * well as invoke sorflush() and perform wakeups.  The direct call to
+	 * dom_dispose() and sbrelease_internal() are an inlining of what was
+	 * necessary from sorflush().
+	 *
+	 * Notice that the socket buffer and kqueue state are torn down
+	 * before calling pru_detach.  This means that protocols shold not
+	 * assume they can perform socket wakeups, etc, in their detach code.
+	 */
+	sodealloc(so);
+}
+/* Taken from  /src/sys/kern/uipc_socket.c */
+int
+soabort(so)
+	struct socket *so;
+{
+	int error;
+#if defined(INET6)
+	struct sctp_inpcb *inp;
+#endif
+#if defined(INET6)
+	inp = (struct sctp_inpcb *)so->so_pcb;
+	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
+		error = sctp6_abort(so);
+	} else {
+#if defined(INET)
+		error = sctp_abort(so);
+#else
+		error = EAFNOSUPPORT;
+#endif
+	}
+#elif defined(INET)
+	error = sctp_abort(so);
+#else
+	error = EAFNOSUPPORT;
+#endif
+	if (error) {
+		sofree(so);
+		return error;
+	}
+	return (0);
+}
+/* Taken from  usr/src/sys/kern/uipc_socket.c and called within sctp_connect (sctp_usrreq.c).
+*  We use sctp_connect for send_one_init_real in ms1.
+*/
+void
+soisconnecting(struct socket *so)
+{
+	SOCK_LOCK(so);
+	so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
+	so->so_state |= SS_ISCONNECTING;
+	SOCK_UNLOCK(so);
+}
+/* Taken from  usr/src/sys/kern/uipc_socket.c and called within sctp_disconnect (sctp_usrreq.c).
+*  TODO Do we use sctp_disconnect?
+*/
+void
+soisdisconnecting(struct socket *so)
+{
+/*
+* Note: This code assumes that SOCK_LOCK(so) and
+* SOCKBUF_LOCK(&so->so_rcv) are the same.
+*/
+SOCKBUF_LOCK(&so->so_rcv);
+so->so_state &= ~SS_ISCONNECTING;
+so->so_state |= SS_ISDISCONNECTING;
+so->so_rcv.sb_state |= SBS_CANTRCVMORE;
+sorwakeup_locked(so);
+SOCKBUF_LOCK(&so->so_snd);
+so->so_snd.sb_state |= SBS_CANTSENDMORE;
+sowwakeup_locked(so);
+wakeup("dummy",so);
+/* requires 2 args but this was in orig */
+/* wakeup(&so->so_timeo); */
+}
+/* Taken from sys/kern/kern_synch.c and
+modified for __Userspace__
+*/
+/*
+* Make all threads sleeping on the specified identifier runnable.
+* Associating wakeup with so_timeo identifier and timeo_cond
+* condition variable. TODO. If we use iterator thread then we need to
+* modify wakeup so it can distinguish between iterator identifier and
+* timeo identifier.
+*/
+void
+wakeup(ident, so)
+	void *ident;
+	struct socket *so;
+{
+	SOCK_LOCK(so);
+#if defined (__Userspace_os_Windows)
+	WakeAllConditionVariable(&(so)->timeo_cond);
+#else
+	pthread_cond_broadcast(&(so)->timeo_cond);
+#endif
+	SOCK_UNLOCK(so);
+}
+/*
+* Make a thread sleeping on the specified identifier runnable.
+* May wake more than one thread if a target thread is currently
+* swapped out.
+*/
+void
+wakeup_one(ident)
+	void *ident;
+{
+	/* __Userspace__ Check: We are using accept_cond for wakeup_one.
+	  It seems that wakeup_one is only called within
+	  soisconnected() and sonewconn() with ident &head->so_timeo
+	  head is so->so_head, which is back pointer to listen socket
+	  This seems to indicate that the use of accept_cond is correct
+	  since socket where accepts occur is so_head in all
+	  subsidiary sockets.
+	 */
+	ACCEPT_LOCK();
+#if defined (__Userspace_os_Windows)
+	WakeAllConditionVariable(&accept_cond);
+#else
+	pthread_cond_broadcast(&accept_cond);
+#endif
+	ACCEPT_UNLOCK();
+}
+/* Called within sctp_process_cookie_[existing/new] */
+void
+soisconnected(struct socket *so)
+{
+	struct socket *head;
+	ACCEPT_LOCK();
+	SOCK_LOCK(so);
+	so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
+	so->so_state |= SS_ISCONNECTED;
+	head = so->so_head;
+	if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
+		SOCK_UNLOCK(so);
+		TAILQ_REMOVE(&head->so_incomp, so, so_list);
+		head->so_incqlen--;
+		so->so_qstate &= ~SQ_INCOMP;
+		TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
+		head->so_qlen++;
+		so->so_qstate |= SQ_COMP;
+		ACCEPT_UNLOCK();
+		sorwakeup(head);
+		wakeup_one(&head->so_timeo);
+		return;
+	}
+	SOCK_UNLOCK(so);
+	ACCEPT_UNLOCK();
+	wakeup(&so->so_timeo, so);
+	sorwakeup(so);
+	sowwakeup(so);
+}
+/* called within sctp_handle_cookie_echo */
+struct socket *
+sonewconn(struct socket *head, int connstatus)
+{
+	struct socket *so;
+	int over;
+	ACCEPT_LOCK();
+	over = (head->so_qlen > 3 * head->so_qlimit / 2);
+	ACCEPT_UNLOCK();
+#ifdef REGRESSION
+	if (regression_sonewconn_earlytest && over)
+#else
+	if (over)
+#endif
+		return (NULL);
+	so = soalloc();
+	if (so == NULL)
+		return (NULL);
+	so->so_head = head;
+	so->so_type = head->so_type;
+	so->so_options = head->so_options &~ SCTP_SO_ACCEPTCONN;
+	so->so_linger = head->so_linger;
+	so->so_state = head->so_state | SS_NOFDREF;
+	so->so_dom = head->so_dom;
+#ifdef MAC
+	SOCK_LOCK(head);
+	mac_create_socket_from_socket(head, so);
+	SOCK_UNLOCK(head);
+#endif
+	if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
+		sodealloc(so);
+		return (NULL);
+	}
+	switch (head->so_dom) {
+#ifdef INET
+	case AF_INET:
+		if (sctp_attach(so, IPPROTO_SCTP, SCTP_DEFAULT_VRFID)) {
+			sodealloc(so);
+			return (NULL);
+		}
+		break;
+#endif
+#ifdef INET6
+	case AF_INET6:
+		if (sctp6_attach(so, IPPROTO_SCTP, SCTP_DEFAULT_VRFID)) {
+			sodealloc(so);
+			return (NULL);
+		}
+		break;
+#endif
+	case AF_CONN:
+		if (sctpconn_attach(so, IPPROTO_SCTP, SCTP_DEFAULT_VRFID)) {
+			sodealloc(so);
+			return (NULL);
+		}
+		break;
+	default:
+		sodealloc(so);
+		return (NULL);
+		break;
+	}
+	so->so_rcv.sb_lowat = head->so_rcv.sb_lowat;
+	so->so_snd.sb_lowat = head->so_snd.sb_lowat;
+	so->so_rcv.sb_timeo = head->so_rcv.sb_timeo;
+	so->so_snd.sb_timeo = head->so_snd.sb_timeo;
+	so->so_rcv.sb_flags |= head->so_rcv.sb_flags & SB_AUTOSIZE;
+	so->so_snd.sb_flags |= head->so_snd.sb_flags & SB_AUTOSIZE;
+	so->so_state |= connstatus;
+	ACCEPT_LOCK();
+	if (connstatus) {
+		TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
+		so->so_qstate |= SQ_COMP;
+		head->so_qlen++;
+	} else {
+		/*
+		 * Keep removing sockets from the head until there's room for
+		 * us to insert on the tail.  In pre-locking revisions, this
+		 * was a simple if(), but as we could be racing with other
+		 * threads and soabort() requires dropping locks, we must
+		 * loop waiting for the condition to be true.
+		 */
+		while (head->so_incqlen > head->so_qlimit) {
+			struct socket *sp;
+			sp = TAILQ_FIRST(&head->so_incomp);
+			TAILQ_REMOVE(&head->so_incomp, sp, so_list);
+			head->so_incqlen--;
+			sp->so_qstate &= ~SQ_INCOMP;
+			sp->so_head = NULL;
+			ACCEPT_UNLOCK();
+			soabort(sp);
+			ACCEPT_LOCK();
+		}
+		TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
+		so->so_qstate |= SQ_INCOMP;
+		head->so_incqlen++;
+	}
+	ACCEPT_UNLOCK();
+	if (connstatus) {
+		sorwakeup(head);
+		wakeup_one(&head->so_timeo);
+	}
+	return (so);
+}
+/* From /src/sys/sys/sysproto.h */
+struct sctp_generic_sendmsg_args {
+	int sd;
+	caddr_t msg;
+	int mlen;
+	caddr_t to;
+	socklen_t tolen;  /* was __socklen_t */
+	struct sctp_sndrcvinfo * sinfo;
+	int flags;
+};
+struct sctp_generic_recvmsg_args {
+int sd;
+struct iovec *iov;
+int iovlen;
+struct sockaddr *from;
+socklen_t *fromlenaddr; /* was __socklen_t */
+struct sctp_sndrcvinfo *sinfo;
+int *msg_flags;
+};
+/*
+Source: /src/sys/gnu/fs/xfs/FreeBSD/xfs_ioctl.c
+*/
+static __inline__ int
+copy_to_user(void *dst, void *src, int len) {
+	memcpy(dst, src, len);
+	return 0;
+}
+static __inline__ int
+copy_from_user(void *dst, void *src, int len) {
+	memcpy(dst, src, len);
+	return 0;
+}
+/*
+References:
+src/sys/dev/lmc/if_lmc.h:
+src/sys/powerpc/powerpc/copyinout.c
+src/sys/sys/systm.h
+*/
+# define copyin(u, k, len)	copy_from_user(k, u, len)
+/* References:
+src/sys/powerpc/powerpc/copyinout.c
+src/sys/sys/systm.h
+*/
+# define copyout(k, u, len)	copy_to_user(u, k, len)
+/* copyiniov definition copied/modified from src/sys/kern/kern_subr.c */
+int
+copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
+{
+	u_int iovlen;
+	*iov = NULL;
+	if (iovcnt > UIO_MAXIOV)
+		return (error);
+	iovlen = iovcnt * sizeof (struct iovec);
+	*iov = malloc(iovlen); /*, M_IOV, M_WAITOK); */
+	error = copyin(iovp, *iov, iovlen);
+	if (error) {
+		free(*iov); /*, M_IOV); */
+		*iov = NULL;
+	}
+	return (error);
+}
+/* (__Userspace__) version of uiomove */
+int
+uiomove(void *cp, int n, struct uio *uio)
+{
+	struct iovec *iov;
+	int cnt;
+	int error = 0;
+	if ((uio->uio_rw != UIO_READ) &&
+	    (uio->uio_rw != UIO_WRITE)) {
+		return (EINVAL);
+	}
+	while (n > 0 && uio->uio_resid) {
+		iov = uio->uio_iov;
+		cnt = iov->iov_len;
+		if (cnt == 0) {
+			uio->uio_iov++;
+			uio->uio_iovcnt--;
+			continue;
+		}
+		if (cnt > n)
+			cnt = n;
+		switch (uio->uio_segflg) {
+		case UIO_USERSPACE:
+			if (uio->uio_rw == UIO_READ)
+				error = copyout(cp, iov->iov_base, cnt);
+			else
+				error = copyin(iov->iov_base, cp, cnt);
+			if (error)
+				goto out;
+			break;
+		case UIO_SYSSPACE:
+			if (uio->uio_rw == UIO_READ)
+				bcopy(cp, iov->iov_base, cnt);
+			else
+				bcopy(iov->iov_base, cp, cnt);
+			break;
+		}
+		iov->iov_base = (char *)iov->iov_base + cnt;
+		iov->iov_len -= cnt;
+		uio->uio_resid -= cnt;
+		uio->uio_offset += cnt;
+		cp = (char *)cp + cnt;
+		n -= cnt;
+	}
+out:
+	return (error);
+}
+/* Source: src/sys/kern/uipc_syscalls.c */
+int
+getsockaddr(namp, uaddr, len)
+	struct sockaddr **namp;
+	caddr_t uaddr;
+	size_t len;
+{
+	struct sockaddr *sa;
+	int error;
+	if (len > SOCK_MAXADDRLEN)
+		return (ENAMETOOLONG);
+	if (len < offsetof(struct sockaddr, sa_data))
+		return (EINVAL);
+	MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK);
+	error = copyin(uaddr, sa, len);
+	if (error) {
+		FREE(sa, M_SONAME);
+	} else {
+#ifdef HAVE_SA_LEN
+		sa->sa_len = len;
+#endif
+		*namp = sa;
+	}
+	return (error);
+}
+/* Taken from  /src/lib/libc/net/sctp_sys_calls.c
+* and modified for __Userspace__
+* calling sctp_generic_sendmsg from this function
+*/
+ssize_t
+userspace_sctp_sendmsg(struct socket *so,
+const void *data,
+size_t len,
+struct sockaddr *to,
+socklen_t tolen,
+u_int32_t ppid,
+u_int32_t flags,
+u_int16_t stream_no,
+u_int32_t timetolive,
+u_int32_t context)
+{
+	struct sctp_sndrcvinfo sndrcvinfo, *sinfo = &sndrcvinfo;
+	struct uio auio;
+	struct iovec iov[1];
+	sinfo->sinfo_ppid = ppid;
+	sinfo->sinfo_flags = flags;
+	sinfo->sinfo_stream = stream_no;
+	sinfo->sinfo_timetolive = timetolive;
+	sinfo->sinfo_context = context;
+	sinfo->sinfo_assoc_id = 0;
+	/* Perform error checks on destination (to) */
+	if (tolen > SOCK_MAXADDRLEN){
+		errno = ENAMETOOLONG;
+		return (-1);
+	}
+	if ((tolen > 0) &&
+	    ((to == NULL) || (tolen < (socklen_t)sizeof(struct sockaddr)))) {
+		errno = EINVAL;
+		return (-1);
+	}
+	/* Adding the following as part of defensive programming, in case the application
+	   does not do it when preparing the destination address.*/
+#ifdef HAVE_SA_LEN
+	if (to != NULL) {
+		to->sa_len = tolen;
+	}
+#endif
+	iov[0].iov_base = (caddr_t)data;
+	iov[0].iov_len = len;
+	auio.uio_iov =  iov;
+	auio.uio_iovcnt = 1;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_rw = UIO_WRITE;
+	auio.uio_offset = 0;			/* XXX */
+	auio.uio_resid = len;
+	errno = sctp_lower_sosend(so, to, &auio, NULL, NULL, 0, sinfo);
+	if (errno == 0) {
+		return (len - auio.uio_resid);
+	} else {
+		return (-1);
+	}
+}
+ssize_t
+usrsctp_sendv(struct socket *so,
+const void *data,
+size_t len,
+struct sockaddr *to,
+int addrcnt,
+void *info,
+socklen_t infolen,
+unsigned int infotype,
+int flags)
+{
+	struct sctp_sndrcvinfo sinfo;
+	struct uio auio;
+	struct iovec iov[1];
+	int use_sinfo;
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
+	use_sinfo = 0;
+	switch (infotype) {
+	case SCTP_SENDV_NOINFO:
+		if ((infolen != 0) || (info != NULL)) {
+			errno = EINVAL;
+			return (-1);
+		}
+		break;
+	case SCTP_SENDV_SNDINFO:
+		if ((info == NULL) || (infolen != sizeof(struct sctp_sndinfo))) {
+			errno = EINVAL;
+			return (-1);
+		}
+		sinfo.sinfo_stream = ((struct sctp_sndinfo *)info)->snd_sid;
+		sinfo.sinfo_flags = ((struct sctp_sndinfo *)info)->snd_flags;
+		sinfo.sinfo_ppid = ((struct sctp_sndinfo *)info)->snd_ppid;
+		sinfo.sinfo_context = ((struct sctp_sndinfo *)info)->snd_context;
+		sinfo.sinfo_assoc_id = ((struct sctp_sndinfo *)info)->snd_assoc_id;
+		use_sinfo = 1;
+		break;
+	case SCTP_SENDV_PRINFO:
+		if ((info == NULL) || (infolen != sizeof(struct sctp_prinfo))) {
+			errno = EINVAL;
+			return (-1);
+		}
+		sinfo.sinfo_stream = 0;
+		sinfo.sinfo_flags = PR_SCTP_POLICY(((struct sctp_prinfo *)info)->pr_policy);
+		sinfo.sinfo_timetolive = ((struct sctp_prinfo *)info)->pr_value;
+		use_sinfo = 1;
+		break;
+	case SCTP_SENDV_AUTHINFO:
+		errno = EINVAL;
+		return (-1);
+	case SCTP_SENDV_SPA:
+		if ((info == NULL) || (infolen != sizeof(struct sctp_sendv_spa))) {
+			errno = EINVAL;
+			return (-1);
+		}
+		if (((struct sctp_sendv_spa *)info)->sendv_flags & SCTP_SEND_SNDINFO_VALID) {
+			sinfo.sinfo_stream = ((struct sctp_sendv_spa *)info)->sendv_sndinfo.snd_sid;
+			sinfo.sinfo_flags = ((struct sctp_sendv_spa *)info)->sendv_sndinfo.snd_flags;
+			sinfo.sinfo_ppid = ((struct sctp_sendv_spa *)info)->sendv_sndinfo.snd_ppid;
+			sinfo.sinfo_context = ((struct sctp_sendv_spa *)info)->sendv_sndinfo.snd_context;
+			sinfo.sinfo_assoc_id = ((struct sctp_sendv_spa *)info)->sendv_sndinfo.snd_assoc_id;
+		} else {
+			sinfo.sinfo_flags = 0;
+			sinfo.sinfo_stream = 0;
+		}
+		if (((struct sctp_sendv_spa *)info)->sendv_flags & SCTP_SEND_PRINFO_VALID) {
+			sinfo.sinfo_flags |= PR_SCTP_POLICY(((struct sctp_sendv_spa *)info)->sendv_prinfo.pr_policy);
+			sinfo.sinfo_timetolive = ((struct sctp_sendv_spa *)info)->sendv_prinfo.pr_value;
+		}
+		if (((struct sctp_sendv_spa *)info)->sendv_flags & SCTP_SEND_AUTHINFO_VALID) {
+			errno = EINVAL;
+			return (-1);
+		}
+		use_sinfo = 1;
+		break;
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+	/* Perform error checks on destination (to) */
+	if (addrcnt > 1) {
+		errno = EINVAL;
+		return (-1);
+	}
+	iov[0].iov_base = (caddr_t)data;
+	iov[0].iov_len = len;
+	auio.uio_iov =  iov;
+	auio.uio_iovcnt = 1;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_rw = UIO_WRITE;
+	auio.uio_offset = 0;			/* XXX */
+	auio.uio_resid = len;
+	errno = sctp_lower_sosend(so, to, &auio, NULL, NULL, flags, use_sinfo ? &sinfo : NULL);
+	if (errno == 0) {
+		return (len - auio.uio_resid);
+	} else {
+		return (-1);
+	}
+}
+ssize_t
+userspace_sctp_sendmbuf(struct socket *so,
+struct mbuf* mbufdata,
+size_t len,
+struct sockaddr *to,
+socklen_t tolen,
+u_int32_t ppid,
+u_int32_t flags,
+u_int16_t stream_no,
+u_int32_t timetolive,
+u_int32_t context)
+{
+struct sctp_sndrcvinfo sndrcvinfo, *sinfo = &sndrcvinfo;
+/*    struct uio auio;
+struct iovec iov[1]; */
+int error = 0;
+int uflags = 0;
+int retvalsendmsg;
+sinfo->sinfo_ppid = ppid;
+sinfo->sinfo_flags = flags;
+sinfo->sinfo_stream = stream_no;
+sinfo->sinfo_timetolive = timetolive;
+sinfo->sinfo_context = context;
+sinfo->sinfo_assoc_id = 0;
+/* Perform error checks on destination (to) */
+if (tolen > SOCK_MAXADDRLEN){
+error = (ENAMETOOLONG);
+goto sendmsg_return;
+}
+if (tolen < (socklen_t)offsetof(struct sockaddr, sa_data)){
+error = (EINVAL);
+goto sendmsg_return;
+}
+/* Adding the following as part of defensive programming, in case the application
+does not do it when preparing the destination address.*/
+#ifdef HAVE_SA_LEN
+to->sa_len = tolen;
+#endif
+error = sctp_lower_sosend(so, to, NULL/*uio*/,
+(struct mbuf *)mbufdata, (struct mbuf *)NULL,
+uflags, sinfo);
+sendmsg_return:
+/* TODO: Needs a condition for non-blocking when error is EWOULDBLOCK */
+if (0 == error)
+retvalsendmsg = len;
+else if(error == EWOULDBLOCK) {
+errno = EWOULDBLOCK;
+retvalsendmsg = (-1);
+} else {
+SCTP_PRINTF("%s: error = %d\n", __func__, error);
+errno = error;
+retvalsendmsg = (-1);
+}
+return retvalsendmsg;
+}
+/* taken from usr.lib/sctp_sys_calls.c and needed here */
+#define        SCTP_SMALL_IOVEC_SIZE 2
+/* Taken from  /src/lib/libc/net/sctp_sys_calls.c
+* and modified for __Userspace__
+* calling sctp_generic_recvmsg from this function
+*/
+ssize_t
+userspace_sctp_recvmsg(struct socket *so,
+void *dbuf,
+size_t len,
+struct sockaddr *from,
+socklen_t *fromlenp,
+struct sctp_sndrcvinfo *sinfo,
+int *msg_flags)
+{
+	struct uio auio;
+	struct iovec iov[SCTP_SMALL_IOVEC_SIZE];
+	struct iovec *tiov;
+	int iovlen = 1;
+	int error = 0;
+	int ulen, i, retval;
+	socklen_t fromlen;
+	iov[0].iov_base = dbuf;
+	iov[0].iov_len = len;
+	auio.uio_iov = iov;
+	auio.uio_iovcnt = iovlen;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_rw = UIO_READ;
+	auio.uio_offset = 0;			/* XXX */
+	auio.uio_resid = 0;
+	tiov = iov;
+	for (i = 0; i <iovlen; i++, tiov++) {
+		if ((auio.uio_resid += tiov->iov_len) < 0) {
+			error = EINVAL;
+			SCTP_PRINTF("%s: error = %d\n", __func__, error);
+			return (-1);
+		}
+	}
+	ulen = auio.uio_resid;
+	if (fromlenp != NULL) {
+		fromlen = *fromlenp;
+	} else {
+		fromlen = 0;
+	}
+	error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
+		    from, fromlen, msg_flags,
+		    (struct sctp_sndrcvinfo *)sinfo, 1);
+	if (error) {
+		if (auio.uio_resid != (int)ulen &&
+		    (error == EINTR ||
+#if !defined(__Userspace_os_NetBSD)
+		     error == ERESTART ||
+#endif
+		     error == EWOULDBLOCK)) {
+			error = 0;
+		}
+	}
+	if ((fromlenp != NULL) && (fromlen > 0) && (from != NULL)) {
+		switch (from->sa_family) {
+#if defined(INET)
+		case AF_INET:
+			*fromlenp = sizeof(struct sockaddr_in);
+			break;
+#endif
+#if defined(INET6)
+		case AF_INET6:
+			*fromlenp = sizeof(struct sockaddr_in6);
+			break;
+#endif
+		case AF_CONN:
+			*fromlenp = sizeof(struct sockaddr_conn);
+			break;
+		default:
+			*fromlenp = 0;
+			break;
+		}
+		if (*fromlenp > fromlen) {
+			*fromlenp = fromlen;
+		}
+	}
+	if (error == 0){
+		/* ready return value */
+		retval = (int)ulen - auio.uio_resid;
+		return (retval);
+	} else {
+		SCTP_PRINTF("%s: error = %d\n", __func__, error);
+		return (-1);
+	}
+}
+ssize_t
+usrsctp_recvv(struct socket *so,
+void *dbuf,
+size_t len,
+struct sockaddr *from,
+socklen_t *fromlenp,
+void *info,
+socklen_t *infolen,
+unsigned int *infotype,
+int *msg_flags)
+{
+	struct uio auio;
+	struct iovec iov[SCTP_SMALL_IOVEC_SIZE];
+	struct iovec *tiov;
+	int iovlen = 1;
+	int ulen, i;
+	socklen_t fromlen;
+	struct sctp_rcvinfo *rcv;
+	struct sctp_recvv_rn *rn;
+	struct sctp_extrcvinfo seinfo;
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	iov[0].iov_base = dbuf;
+	iov[0].iov_len = len;
+	auio.uio_iov = iov;
+	auio.uio_iovcnt = iovlen;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_rw = UIO_READ;
+	auio.uio_offset = 0;			/* XXX */
+	auio.uio_resid = 0;
+	tiov = iov;
+	for (i = 0; i <iovlen; i++, tiov++) {
+		if ((auio.uio_resid += tiov->iov_len) < 0) {
+			errno = EINVAL;
+			return (-1);
+		}
+	}
+	ulen = auio.uio_resid;
+	if (fromlenp != NULL) {
+		fromlen = *fromlenp;
+	} else {
+		fromlen = 0;
+	}
+	errno = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
+		    from, fromlen, msg_flags,
+		    (struct sctp_sndrcvinfo *)&seinfo, 1);
+	if (errno) {
+		if (auio.uio_resid != (int)ulen &&
+		    (errno == EINTR ||
+#if !defined(__Userspace_os_NetBSD)
+		     errno == ERESTART ||
+#endif
+		     errno == EWOULDBLOCK)) {
+			errno = 0;
+		}
+	}
+	if ((*msg_flags & MSG_NOTIFICATION) == 0) {
+		struct sctp_inpcb *inp;
+		inp = (struct sctp_inpcb *)so->so_pcb;
+		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
+		    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
+		    *infolen >= (socklen_t)sizeof(struct sctp_recvv_rn) &&
+		    seinfo.sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL) {
+			rn = (struct sctp_recvv_rn *)info;
+			rn->recvv_rcvinfo.rcv_sid = seinfo.sinfo_stream;
+			rn->recvv_rcvinfo.rcv_ssn = seinfo.sinfo_ssn;
+			rn->recvv_rcvinfo.rcv_flags = seinfo.sinfo_flags;
+			rn->recvv_rcvinfo.rcv_ppid = seinfo.sinfo_ppid;
+			rn->recvv_rcvinfo.rcv_context = seinfo.sinfo_context;
+			rn->recvv_rcvinfo.rcv_tsn = seinfo.sinfo_tsn;
+			rn->recvv_rcvinfo.rcv_cumtsn = seinfo.sinfo_cumtsn;
+			rn->recvv_rcvinfo.rcv_assoc_id = seinfo.sinfo_assoc_id;
+			rn->recvv_nxtinfo.nxt_sid = seinfo.sreinfo_next_stream;
+			rn->recvv_nxtinfo.nxt_flags = 0;
+			if (seinfo.sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
+				rn->recvv_nxtinfo.nxt_flags |= SCTP_UNORDERED;
+			}
+			if (seinfo.sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
+				rn->recvv_nxtinfo.nxt_flags |= SCTP_NOTIFICATION;
+			}
+			if (seinfo.sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
+				rn->recvv_nxtinfo.nxt_flags |= SCTP_COMPLETE;
+			}
+			rn->recvv_nxtinfo.nxt_ppid = seinfo.sreinfo_next_ppid;
+			rn->recvv_nxtinfo.nxt_length = seinfo.sreinfo_next_length;
+			rn->recvv_nxtinfo.nxt_assoc_id = seinfo.sreinfo_next_aid;
+			*infolen = (socklen_t)sizeof(struct sctp_recvv_rn);
+			*infotype = SCTP_RECVV_RN;
+		} else if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
+		           *infolen >= (socklen_t)sizeof(struct sctp_rcvinfo)) {
+			rcv = (struct sctp_rcvinfo *)info;
+			rcv->rcv_sid = seinfo.sinfo_stream;
+			rcv->rcv_ssn = seinfo.sinfo_ssn;
+			rcv->rcv_flags = seinfo.sinfo_flags;
+			rcv->rcv_ppid = seinfo.sinfo_ppid;
+			rcv->rcv_context = seinfo.sinfo_context;
+			rcv->rcv_tsn = seinfo.sinfo_tsn;
+			rcv->rcv_cumtsn = seinfo.sinfo_cumtsn;
+			rcv->rcv_assoc_id = seinfo.sinfo_assoc_id;
+			*infolen = (socklen_t)sizeof(struct sctp_rcvinfo);
+			*infotype = SCTP_RECVV_RCVINFO;
+		} else {
+			*infotype = SCTP_RECVV_NOINFO;
+			*infolen = 0;
+		}
+	}
+	if ((fromlenp != NULL) && (fromlen > 0) && (from != NULL)) {
+		switch (from->sa_family) {
+#if defined(INET)
+		case AF_INET:
+			*fromlenp = sizeof(struct sockaddr_in);
+			break;
+#endif
+#if defined(INET6)
+		case AF_INET6:
+			*fromlenp = sizeof(struct sockaddr_in6);
+			break;
+#endif
+		case AF_CONN:
+			*fromlenp = sizeof(struct sockaddr_conn);
+			break;
+		default:
+			*fromlenp = 0;
+			break;
+		}
+		if (*fromlenp > fromlen) {
+			*fromlenp = fromlen;
+		}
+	}
+	if (errno == 0) {
+		/* ready return value */
+		return ((int)ulen - auio.uio_resid);
+	} else {
+		return (-1);
+	}
+}
+#if defined(__Userspace__)
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+* socreate returns a socket.  The socket should be
+* closed with soclose().
+*/
+int
+socreate(int dom, struct socket **aso, int type, int proto)
+{
+	struct socket *so;
+	int error;
+	if ((dom != AF_CONN) && (dom != AF_INET) && (dom != AF_INET6)) {
+		return (EINVAL);
+	}
+	if ((type != SOCK_STREAM) && (type != SOCK_SEQPACKET)) {
+		return (EINVAL);
+	}
+	if (proto != IPPROTO_SCTP) {
+		return (EINVAL);
+	}
+	so = soalloc();
+	if (so == NULL) {
+		return (ENOBUFS);
+	}
+	/*
+	 * so_incomp represents a queue of connections that
+	 * must be completed at protocol level before being
+	 * returned. so_comp field heads a list of sockets
+	 * that are ready to be returned to the listening process
+	 *__Userspace__ These queues are being used at a number of places like accept etc.
+	 */
+	TAILQ_INIT(&so->so_incomp);
+	TAILQ_INIT(&so->so_comp);
+	so->so_type = type;
+	so->so_count = 1;
+	so->so_dom = dom;
+	/*
+	 * Auto-sizing of socket buffers is managed by the protocols and
+	 * the appropriate flags must be set in the pru_attach function.
+	 * For __Userspace__ The pru_attach function in this case is sctp_attach.
+	 */
+	switch (dom) {
+#if defined(INET)
+	case AF_INET:
+		error = sctp_attach(so, proto, SCTP_DEFAULT_VRFID);
+		break;
+#endif
+#if defined(INET6)
+	case AF_INET6:
+		error = sctp6_attach(so, proto, SCTP_DEFAULT_VRFID);
+		break;
+#endif
+	case AF_CONN:
+		error = sctpconn_attach(so, proto, SCTP_DEFAULT_VRFID);
+		break;
+	default:
+		error = EAFNOSUPPORT;
+		break;
+	}
+	if (error) {
+		KASSERT(so->so_count == 1, ("socreate: so_count %d", so->so_count));
+		so->so_count = 0;
+		sodealloc(so);
+		return (error);
+	}
+	*aso = so;
+	return (0);
+}
+#else
+/* The kernel version for reference is below. The #else
+should be removed once the __Userspace__
+version is tested.
+* socreate returns a socket with a ref count of 1.  The socket should be
+* closed with soclose().
+*/
+int
+socreate(int dom, struct socket **aso, int type, int proto,
+struct ucred *cred, struct thread *td)
+{
+	struct protosw *prp;
+	struct socket *so;
+	int error;
+	if (proto)
+		prp = pffindproto(dom, proto, type);
+	else
+		prp = pffindtype(dom, type);
+	if (prp == NULL || prp->pr_usrreqs->pru_attach == NULL ||
+	    prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
+		return (EPROTONOSUPPORT);
+	if (jailed(cred) && jail_socket_unixiproute_only &&
+	    prp->pr_domain->dom_family != PF_LOCAL &&
+	    prp->pr_domain->dom_family != PF_INET &&
+	    prp->pr_domain->dom_family != PF_ROUTE) {
+		return (EPROTONOSUPPORT);
+	}
+	if (prp->pr_type != type)
+		return (EPROTOTYPE);
+	so = soalloc();
+	if (so == NULL)
+		return (ENOBUFS);
+	TAILQ_INIT(&so->so_incomp);
+	TAILQ_INIT(&so->so_comp);
+	so->so_type = type;
+	so->so_cred = crhold(cred);
+	so->so_proto = prp;
+#ifdef MAC
+	mac_create_socket(cred, so);
+#endif
+	knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
+	    NULL, NULL, NULL);
+	knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
+	    NULL, NULL, NULL);
+	so->so_count = 1;
+	/*
+	 * Auto-sizing of socket buffers is managed by the protocols and
+	 * the appropriate flags must be set in the pru_attach function.
+	 */
+	error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
+	if (error) {
+		KASSERT(so->so_count == 1, ("socreate: so_count %d",
+		    so->so_count));
+		so->so_count = 0;
+		sodealloc(so);
+		return (error);
+	}
+	*aso = so;
+	return (0);
+}
+#endif
+/* Taken from  /src/sys/kern/uipc_syscalls.c
+* and modified for __Userspace__
+* Removing struct thread td.
+*/
+struct socket *
+userspace_socket(int domain, int type, int protocol)
+{
+	struct socket *so = NULL;
+	errno = socreate(domain, &so, type, protocol);
+	if (errno) {
+		return (NULL);
+	}
+	/*
+	 * The original socket call returns the file descriptor fd.
+	 * td->td_retval[0] = fd.
+	 * We are returning struct socket *so.
+	 */
+	return (so);
+}
+struct socket *
+usrsctp_socket(int domain, int type, int protocol,
+	       int (*receive_cb)(struct socket *sock, union sctp_sockstore addr, void *data,
+size_t datalen, struct sctp_rcvinfo, int flags, void *ulp_info),
+	       int (*send_cb)(struct socket *sock, uint32_t sb_free),
+	       uint32_t sb_threshold,
+	       void *ulp_info)
+{
+	struct socket *so;
+	if ((protocol = IPPROTO_SCTP) && (SCTP_BASE_VAR(sctp_pcb_initialized) == 0)) {
+		errno = EPROTONOSUPPORT;
+		return (NULL);
+	}
+	if ((receive_cb == NULL) &&
+	    ((send_cb != NULL) || (sb_threshold != 0) || (ulp_info != NULL))) {
+		errno = EINVAL;
+		return (NULL);
+	}
+	if ((domain == AF_CONN) && (SCTP_BASE_VAR(conn_output) == NULL)) {
+		errno = EAFNOSUPPORT;
+		return (NULL);
+	}
+	errno = socreate(domain, &so, type, protocol);
+	if (errno) {
+		return (NULL);
+	}
+	/*
+	 * The original socket call returns the file descriptor fd.
+	 * td->td_retval[0] = fd.
+	 * We are returning struct socket *so.
+	 */
+	register_recv_cb(so, receive_cb);
+	register_send_cb(so, sb_threshold, send_cb);
+	register_ulp_info(so, ulp_info);
+	return (so);
+}
+u_long	sb_max = SB_MAX;
+u_long sb_max_adj =
+SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
+static	u_long sb_efficiency = 8;	/* parameter for sbreserve() */
+/*
+* Allot mbufs to a sockbuf.  Attempt to scale mbmax so that mbcnt doesn't
+* become limiting if buffering efficiency is near the normal case.
+*/
+int
+sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so)
+{
+	SOCKBUF_LOCK_ASSERT(sb);
+	sb->sb_mbmax = (u_int)min(cc * sb_efficiency, sb_max);
+	sb->sb_hiwat = cc;
+	if (sb->sb_lowat > (int)sb->sb_hiwat)
+		sb->sb_lowat = (int)sb->sb_hiwat;
+	return (1);
+}
+static int
+sbreserve(struct sockbuf *sb, u_long cc, struct socket *so)
+{
+	int error;
+	SOCKBUF_LOCK(sb);
+	error = sbreserve_locked(sb, cc, so);
+	SOCKBUF_UNLOCK(sb);
+	return (error);
+}
+#if defined(__Userspace__)
+int
+soreserve(struct socket *so, u_long sndcc, u_long rcvcc)
+{
+	SOCKBUF_LOCK(&so->so_snd);
+	SOCKBUF_LOCK(&so->so_rcv);
+	so->so_snd.sb_hiwat = (uint32_t)sndcc;
+	so->so_rcv.sb_hiwat = (uint32_t)rcvcc;
+	if (sbreserve_locked(&so->so_snd, sndcc, so) == 0) {
+		goto bad;
+	}
+	if (sbreserve_locked(&so->so_rcv, rcvcc, so) == 0) {
+		goto bad;
+	}
+	if (so->so_rcv.sb_lowat == 0)
+		so->so_rcv.sb_lowat = 1;
+	if (so->so_snd.sb_lowat == 0)
+		so->so_snd.sb_lowat = MCLBYTES;
+	if (so->so_snd.sb_lowat > (int)so->so_snd.sb_hiwat)
+		so->so_snd.sb_lowat = (int)so->so_snd.sb_hiwat;
+	SOCKBUF_UNLOCK(&so->so_rcv);
+	SOCKBUF_UNLOCK(&so->so_snd);
+	return (0);
+bad:
+	SOCKBUF_UNLOCK(&so->so_rcv);
+	SOCKBUF_UNLOCK(&so->so_snd);
+	return (ENOBUFS);
+}
+#else /* kernel version for reference */
+int
+soreserve(struct socket *so, u_long sndcc, u_long rcvcc)
+{
+	struct thread *td = curthread;
+	SOCKBUF_LOCK(&so->so_snd);
+	SOCKBUF_LOCK(&so->so_rcv);
+	if (sbreserve_locked(&so->so_snd, sndcc, so, td) == 0)
+		goto bad;
+	if (sbreserve_locked(&so->so_rcv, rcvcc, so, td) == 0)
+		goto bad2;
+	if (so->so_rcv.sb_lowat == 0)
+		so->so_rcv.sb_lowat = 1;
+	if (so->so_snd.sb_lowat == 0)
+		so->so_snd.sb_lowat = MCLBYTES;
+	if (so->so_snd.sb_lowat > so->so_snd.sb_hiwat)
+		so->so_snd.sb_lowat = so->so_snd.sb_hiwat;
+	SOCKBUF_UNLOCK(&so->so_rcv);
+	SOCKBUF_UNLOCK(&so->so_snd);
+	return (0);
+bad2:
+	sbrelease_locked(&so->so_snd, so);
+bad:
+	SOCKBUF_UNLOCK(&so->so_rcv);
+	SOCKBUF_UNLOCK(&so->so_snd);
+	return (ENOBUFS);
+}
+#endif
+/* Taken from  /src/sys/kern/uipc_sockbuf.c
+* and modified for __Userspace__
+*/
+#if defined(__Userspace__)
+void
+sowakeup(struct socket *so, struct sockbuf *sb)
+{
+	SOCKBUF_LOCK_ASSERT(sb);
+	sb->sb_flags &= ~SB_SEL;
+	if (sb->sb_flags & SB_WAIT) {
+		sb->sb_flags &= ~SB_WAIT;
+#if defined (__Userspace_os_Windows)
+		WakeAllConditionVariable(&(sb)->sb_cond);
+#else
+		pthread_cond_broadcast(&(sb)->sb_cond);
+#endif
+	}
+	SOCKBUF_UNLOCK(sb);
+	/*__Userspace__ what todo about so_upcall?*/
+}
+#else /* kernel version for reference */
+/*
+* Wakeup processes waiting on a socket buffer.  Do asynchronous notification
+* via SIGIO if the socket has the SS_ASYNC flag set.
+*
+* Called with the socket buffer lock held; will release the lock by the end
+* of the function.  This allows the caller to acquire the socket buffer lock
+* while testing for the need for various sorts of wakeup and hold it through
+* to the point where it's no longer required.  We currently hold the lock
+* through calls out to other subsystems (with the exception of kqueue), and
+* then release it to avoid lock order issues.  It's not clear that's
+* correct.
+*/
+void
+sowakeup(struct socket *so, struct sockbuf *sb)
+{
+	SOCKBUF_LOCK_ASSERT(sb);
+	selwakeuppri(&sb->sb_sel, PSOCK);
+	sb->sb_flags &= ~SB_SEL;
+	if (sb->sb_flags & SB_WAIT) {
+		sb->sb_flags &= ~SB_WAIT;
+		wakeup(&sb->sb_cc);
+	}
+	KNOTE_LOCKED(&sb->sb_sel.si_note, 0);
+	SOCKBUF_UNLOCK(sb);
+	if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
+		pgsigio(&so->so_sigio, SIGIO, 0);
+	if (sb->sb_flags & SB_UPCALL)
+		(*so->so_upcall)(so, so->so_upcallarg, M_NOWAIT);
+	if (sb->sb_flags & SB_AIO)
+		aio_swake(so, sb);
+	mtx_assert(SOCKBUF_MTX(sb), MA_NOTOWNED);
+}
+#endif
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+*/
+int
+sobind(struct socket *so, struct sockaddr *nam)
+{
+	switch (nam->sa_family) {
+#if defined(INET)
+	case AF_INET:
+		return (sctp_bind(so, nam));
+#endif
+#if defined(INET6)
+	case AF_INET6:
+		return (sctp6_bind(so, nam, NULL));
+#endif
+	case AF_CONN:
+		return (sctpconn_bind(so, nam));
+	default:
+		return EAFNOSUPPORT;
+	}
+}
+/* Taken from  /src/sys/kern/uipc_syscalls.c
+* and modified for __Userspace__
+*/
+int
+usrsctp_bind(struct socket *so, struct sockaddr *name, int namelen)
+{
+	struct sockaddr *sa;
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if ((errno = getsockaddr(&sa, (caddr_t)name, namelen)) != 0)
+		return (-1);
+	errno = sobind(so, sa);
+	FREE(sa, M_SONAME);
+	if (errno) {
+		return (-1);
+	} else {
+		return (0);
+	}
+}
+int
+userspace_bind(struct socket *so, struct sockaddr *name, int namelen)
+{
+	return (usrsctp_bind(so, name, namelen));
+}
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+*/
+int
+solisten(struct socket *so, int backlog)
+{
+	if (so == NULL) {
+		return (EBADF);
+	} else {
+		return (sctp_listen(so, backlog, NULL));
+	}
+}
+int
+solisten_proto_check(struct socket *so)
+{
+	SOCK_LOCK_ASSERT(so);
+	if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
+	    SS_ISDISCONNECTING))
+		return (EINVAL);
+	return (0);
+}
+static int somaxconn = SOMAXCONN;
+void
+solisten_proto(struct socket *so, int backlog)
+{
+	SOCK_LOCK_ASSERT(so);
+	if (backlog < 0 || backlog > somaxconn)
+		backlog = somaxconn;
+	so->so_qlimit = backlog;
+	so->so_options |= SCTP_SO_ACCEPTCONN;
+}
+/* Taken from  /src/sys/kern/uipc_syscalls.c
+* and modified for __Userspace__
+*/
+int
+usrsctp_listen(struct socket *so, int backlog)
+{
+	errno = solisten(so, backlog);
+	if (errno) {
+		return (-1);
+	} else {
+		return (0);
+	}
+}
+int
+userspace_listen(struct socket *so, int backlog)
+{
+	return (usrsctp_listen(so, backlog));
+}
+/* Taken from  /src/sys/kern/uipc_socket.c
+* and modified for __Userspace__
+*/
+int
+soaccept(struct socket *so, struct sockaddr **nam)
+{
+	int error;
+	SOCK_LOCK(so);
+	KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
+	so->so_state &= ~SS_NOFDREF;
+	SOCK_UNLOCK(so);
+	error = sctp_accept(so, nam);
+	return (error);
+}
+/* Taken from  /src/sys/kern/uipc_syscalls.c
+* kern_accept modified for __Userspace__
+*/
+int
+user_accept(struct socket *head,  struct sockaddr **name, socklen_t *namelen, struct socket **ptr_accept_ret_sock)
+{
+	struct sockaddr *sa = NULL;
+	int error;
+	struct socket *so = NULL;
+	if (name) {
+		*name = NULL;
+	}
+	if ((head->so_options & SCTP_SO_ACCEPTCONN) == 0) {
+		error = EINVAL;
+		goto done;
+	}
+	ACCEPT_LOCK();
+	if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) {
+		ACCEPT_UNLOCK();
+		error = EWOULDBLOCK;
+		goto noconnection;
+	}
+	while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
+		if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
+			head->so_error = ECONNABORTED;
+			break;
+		}
+#if defined (__Userspace_os_Windows)
+		if (SleepConditionVariableCS(&accept_cond, &accept_mtx, INFINITE))
+			error = 0;
+		else
+			error = GetLastError();
+#else
+		error = pthread_cond_wait(&accept_cond, &accept_mtx);
+#endif
+		if (error) {
+			ACCEPT_UNLOCK();
+			goto noconnection;
+		}
+	}
+	if (head->so_error) {
+		error = head->so_error;
+		head->so_error = 0;
+		ACCEPT_UNLOCK();
+		goto noconnection;
+	}
+	so = TAILQ_FIRST(&head->so_comp);
+	KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
+	KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));
+	/*
+	 * Before changing the flags on the socket, we have to bump the
+	 * reference count.  Otherwise, if the protocol calls sofree(),
+	 * the socket will be released due to a zero refcount.
+	 */
+	SOCK_LOCK(so);			/* soref() and so_state update */
+	soref(so);			/* file descriptor reference */
+	TAILQ_REMOVE(&head->so_comp, so, so_list);
+	head->so_qlen--;
+	so->so_state |= (head->so_state & SS_NBIO);
+	so->so_qstate &= ~SQ_COMP;
+	so->so_head = NULL;
+	SOCK_UNLOCK(so);
+	ACCEPT_UNLOCK();
+	/*
+	 * The original accept returns fd value via td->td_retval[0] = fd;
+	 * we will return the socket for accepted connection.
+	 */
+	error = soaccept(so, &sa);
+	if (error) {
+		/*
+		 * return a namelen of zero for older code which might
+		 * ignore the return value from accept.
+		 */
+		if (name)
+			*namelen = 0;
+		goto noconnection;
+	}
+	if (sa == NULL) {
+		if (name)
+			*namelen = 0;
+		goto done;
+	}
+	if (name) {
+#ifdef HAVE_SA_LEN
+		/* check sa_len before it is destroyed */
+		if (*namelen > sa->sa_len) {
+			*namelen = sa->sa_len;
+		}
+#else
+		socklen_t sa_len;
+		switch (sa->sa_family) {
+#ifdef INET
+		case AF_INET:
+			sa_len = sizeof(struct sockaddr_in);
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			sa_len = sizeof(struct sockaddr_in6);
+			break;
+#endif
+		case AF_CONN:
+			sa_len = sizeof(struct sockaddr_conn);
+			break;
+		default:
+			sa_len = 0;
+			break;
+		}
+		if (*namelen > sa_len) {
+			*namelen = sa_len;
+		}
+#endif
+		*name = sa;
+		sa = NULL;
+	}
+noconnection:
+	if (sa) {
+		FREE(sa, M_SONAME);
+	}
+done:
+	*ptr_accept_ret_sock = so;
+	return (error);
+}
+/* Taken from  /src/sys/kern/uipc_syscalls.c
+* and modified for __Userspace__
+*/
+/*
+* accept1()
+*/
+static int
+accept1(struct socket *so, struct sockaddr *aname, socklen_t *anamelen, struct socket **ptr_accept_ret_sock)
+{
+	struct sockaddr *name;
+	socklen_t namelen;
+	int error;
+	if (so == NULL) {
+		return (EBADF);
+	}
+	if (aname == NULL) {
+		return (user_accept(so, NULL, NULL, ptr_accept_ret_sock));
+	}
+	error = copyin(anamelen, &namelen, sizeof (namelen));
+	if (error)
+		return (error);
+	error = user_accept(so, &name, &namelen, ptr_accept_ret_sock);
+	/*
+	 * return a namelen of zero for older code which might
+	 * ignore the return value from accept.
+	 */
+	if (error) {
+		(void) copyout(&namelen,
+		    anamelen, sizeof(*anamelen));
+		return (error);
+	}
+	if (error == 0 && name != NULL) {
+		error = copyout(name, aname, namelen);
+	}
+	if (error == 0) {
+		error = copyout(&namelen, anamelen, sizeof(namelen));
+	}
+	if (name) {
+		FREE(name, M_SONAME);
+	}
+	return (error);
+}
+struct socket *
+usrsctp_accept(struct socket *so, struct sockaddr *aname, socklen_t *anamelen)
+{
+	struct socket *accept_return_sock;
+	errno = accept1(so, aname, anamelen, &accept_return_sock);
+	if (errno) {
+		return (NULL);
+	} else {
+		return (accept_return_sock);
+	}
+}
+struct socket *
+userspace_accept(struct socket *so, struct sockaddr *aname, socklen_t *anamelen)
+{
+	return (usrsctp_accept(so, aname, anamelen));
+}
+struct socket *
+usrsctp_peeloff(struct socket *head, sctp_assoc_t id)
+{
+	struct socket *so;
+	if ((errno = sctp_can_peel_off(head, id)) != 0) {
+		return (NULL);
+	}
+	if ((so = sonewconn(head, SS_ISCONNECTED)) == NULL) {
+		return (NULL);
+	}
+	ACCEPT_LOCK();
+	SOCK_LOCK(so);
+	soref(so);
+	TAILQ_REMOVE(&head->so_comp, so, so_list);
+	head->so_qlen--;
+	so->so_state |= (head->so_state & SS_NBIO);
+	so->so_qstate &= ~SQ_COMP;
+	so->so_head = NULL;
+	SOCK_UNLOCK(so);
+	ACCEPT_UNLOCK();
+	if ((errno = sctp_do_peeloff(head, so, id)) != 0) {
+		so->so_count = 0;
+		sodealloc(so);
+		return (NULL);
+	}
+	return (so);
+}
+int
+sodisconnect(struct socket *so)
+{
+	int error;
+	if ((so->so_state & SS_ISCONNECTED) == 0)
+		return (ENOTCONN);
+	if (so->so_state & SS_ISDISCONNECTING)
+		return (EALREADY);
+	error = sctp_disconnect(so);
+	return (error);
+}
+int
+usrsctp_set_non_blocking(struct socket *so, int onoff)
+{
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	SOCK_LOCK(so);
+	if (onoff != 0) {
+		so->so_state |= SS_NBIO;
+	} else {
+		so->so_state &= ~SS_NBIO;
+	}
+	SOCK_UNLOCK(so);
+	return (0);
+}
+int
+usrsctp_get_non_blocking(struct socket *so)
+{
+	int result;
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	SOCK_LOCK(so);
+	if (so->so_state | SS_NBIO) {
+		result = 1;
+	} else {
+		result = 0;
+	}
+	SOCK_UNLOCK(so);
+	return (result);
+}
+int
+soconnect(struct socket *so, struct sockaddr *nam)
+{
+	int error;
+	if (so->so_options & SCTP_SO_ACCEPTCONN)
+		return (EOPNOTSUPP);
+	/*
+	 * If protocol is connection-based, can only connect once.
+	 * Otherwise, if connected, try to disconnect first.  This allows
+	 * user to disconnect by connecting to, e.g., a null address.
+	 */
+	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && (error = sodisconnect(so))) {
+		error = EISCONN;
+	} else {
+		/*
+		 * Prevent accumulated error from previous connection from
+		 * biting us.
+		 */
+		so->so_error = 0;
+		switch (nam->sa_family) {
+#if defined(INET)
+		case AF_INET:
+			error = sctp_connect(so, nam);
+			break;
+#endif
+#if defined(INET6)
+		case AF_INET6:
+			error = sctp6_connect(so, nam);
+			break;
+#endif
+		case AF_CONN:
+			error = sctpconn_connect(so, nam);
+			break;
+		default:
+			error = EAFNOSUPPORT;
+		}
+	}
+	return (error);
+}
+int user_connect(struct socket *so, struct sockaddr *sa)
+{
+	int error;
+	int interrupted = 0;
+	if (so == NULL) {
+		error = EBADF;
+		goto done1;
+	}
+	if (so->so_state & SS_ISCONNECTING) {
+		error = EALREADY;
+		goto done1;
+	}
+	error = soconnect(so, sa);
+	if (error) {
+		goto bad;
+	}
+	if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
+		error = EINPROGRESS;
+		goto done1;
+	}
+	SOCK_LOCK(so);
+	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
+#if defined (__Userspace_os_Windows)
+		if (SleepConditionVariableCS(SOCK_COND(so), SOCK_MTX(so), INFINITE))
+			error = 0;
+		else
+			error = -1;
+#else
+		error = pthread_cond_wait(SOCK_COND(so), SOCK_MTX(so));
+#endif
+		if (error) {
+#if defined(__Userspace_os_NetBSD)
+			if (error == EINTR) {
+#else
+			if (error == EINTR || error == ERESTART) {
+#endif
+				interrupted = 1;
+			}
+			break;
+		}
+	}
+	if (error == 0) {
+		error = so->so_error;
+		so->so_error = 0;
+	}
+	SOCK_UNLOCK(so);
+bad:
+	if (!interrupted) {
+		so->so_state &= ~SS_ISCONNECTING;
+	}
+#if !defined(__Userspace_os_NetBSD)
+	if (error == ERESTART) {
+		error = EINTR;
+	}
+#endif
+done1:
+	return (error);
+}
+int usrsctp_connect(struct socket *so, struct sockaddr *name, int namelen)
+{
+	struct sockaddr *sa;
+	errno = getsockaddr(&sa, (caddr_t)name, namelen);
+	if (errno)
+		return (-1);
+	errno = user_connect(so, sa);
+	FREE(sa, M_SONAME);
+	if (errno) {
+		return (-1);
+	} else {
+		return (0);
+	}
+}
+int userspace_connect(struct socket *so, struct sockaddr *name, int namelen)
+{
+	return (usrsctp_connect(so, name, namelen));
+}
+#define SCTP_STACK_BUF_SIZE         2048
+void
+usrsctp_close(struct socket *so) {
+	if (so != NULL) {
+		if (so->so_options & SCTP_SO_ACCEPTCONN) {
+			struct socket *sp;
+			ACCEPT_LOCK();
+			while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
+				TAILQ_REMOVE(&so->so_comp, sp, so_list);
+				so->so_qlen--;
+				sp->so_qstate &= ~SQ_COMP;
+				sp->so_head = NULL;
+				ACCEPT_UNLOCK();
+				soabort(sp);
+				ACCEPT_LOCK();
+			}
+			ACCEPT_UNLOCK();
+		}
+		ACCEPT_LOCK();
+		SOCK_LOCK(so);
+		sorele(so);
+	}
+}
+void
+userspace_close(struct socket *so)
+{
+	usrsctp_close(so);
+}
+int
+usrsctp_shutdown(struct socket *so, int how)
+{
+	if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	sctp_flush(so, how);
+	if (how != SHUT_WR)
+		 socantrcvmore(so);
+	if (how != SHUT_RD) {
+		errno = sctp_shutdown(so);
+		if (errno) {
+			return (-1);
+		} else {
+			return (0);
+		}
+	}
+	return (0);
+}
+int
+userspace_shutdown(struct socket *so, int how)
+{
+	return (usrsctp_shutdown(so, how));
+}
+int
+usrsctp_finish(void)
+{
+	if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+		return (0);
+	}
+	if (SCTP_INP_INFO_TRYLOCK()) {
+		if (!LIST_EMPTY(&SCTP_BASE_INFO(listhead))) {
+			SCTP_INP_INFO_RUNLOCK();
+			return (-1);
+		}
+		SCTP_INP_INFO_RUNLOCK();
+	} else {
+		return (-1);
+	}
+	sctp_finish();
+	return (0);
+}
+int
+userspace_finish(void)
+{
+	return (usrsctp_finish());
+}
+/* needed from sctp_usrreq.c */
+int
+sctp_setopt(struct socket *so, int optname, void *optval, size_t optsize, void *p);
+int
+usrsctp_setsockopt(struct socket *so, int level, int option_name,
+const void *option_value, socklen_t option_len)
+{
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	switch (level) {
+	case SOL_SOCKET:
+	{
+		switch (option_name) {
+		case SO_RCVBUF:
+			if (option_len < (socklen_t)sizeof(int)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				int *buf_size;
+				buf_size = (int *)option_value;
+				if (*buf_size < 1) {
+					errno = EINVAL;
+					return (-1);
+				}
+				sbreserve(&so->so_rcv, (u_long)*buf_size, so);
+				return (0);
+			}
+			break;
+		case SO_SNDBUF:
+			if (option_len < (socklen_t)sizeof(int)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				int *buf_size;
+				buf_size = (int *)option_value;
+				if (*buf_size < 1) {
+					errno = EINVAL;
+					return (-1);
+				}
+				sbreserve(&so->so_snd, (u_long)*buf_size, so);
+				return (0);
+			}
+			break;
+		case SO_LINGER:
+			if (option_len < (socklen_t)sizeof(struct linger)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				struct linger *l;
+				l = (struct linger *)option_value;
+				so->so_linger = l->l_linger;
+				if (l->l_onoff) {
+					so->so_options |= SCTP_SO_LINGER;
+				} else {
+					so->so_options &= ~SCTP_SO_LINGER;
+				}
+				return (0);
+			}
+		default:
+			errno = EINVAL;
+			return (-1);
+		}
+	}
+	case IPPROTO_SCTP:
+		errno = sctp_setopt(so, option_name, (void *) option_value, (size_t)option_len, NULL);
+		if (errno) {
+			return (-1);
+		} else {
+			return (0);
+		}
+	default:
+		errno = ENOPROTOOPT;
+		return (-1);
+	}
+}
+int
+userspace_setsockopt(struct socket *so, int level, int option_name,
+const void *option_value, socklen_t option_len)
+{
+	return (usrsctp_setsockopt(so, level, option_name, option_value, option_len));
+}
+/* needed from sctp_usrreq.c */
+int
+sctp_getopt(struct socket *so, int optname, void *optval, size_t *optsize,
+	    void *p);
+int
+usrsctp_getsockopt(struct socket *so, int level, int option_name,
+void *option_value, socklen_t *option_len)
+{
+	if (so == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (option_len == NULL) {
+		errno = EFAULT;
+		return (-1);
+	}
+	switch (level) {
+	case SOL_SOCKET:
+		switch (option_name) {
+		case SO_RCVBUF:
+			if (*option_len < (socklen_t)sizeof(int)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				int *buf_size;
+				buf_size = (int *)option_value;
+				*buf_size = so->so_rcv.sb_hiwat;;
+				*option_len = (socklen_t)sizeof(int);
+				return (0);
+			}
+			break;
+		case SO_SNDBUF:
+			if (*option_len < (socklen_t)sizeof(int)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				int *buf_size;
+				buf_size = (int *)option_value;
+				*buf_size = so->so_snd.sb_hiwat;
+				*option_len = (socklen_t)sizeof(int);
+				return (0);
+			}
+			break;
+		case SO_LINGER:
+			if (*option_len < (socklen_t)sizeof(struct linger)) {
+				errno = EINVAL;
+				return (-1);
+			} else {
+				struct linger *l;
+				l = (struct linger *)option_value;
+				l->l_linger = so->so_linger;
+				if (so->so_options & SCTP_SO_LINGER) {
+					l->l_onoff = 1;
+				} else {
+					l->l_onoff = 0;
+				}
+				*option_len = (socklen_t)sizeof(struct linger);
+				return (0);
+			}
+		default:
+			errno = EINVAL;
+			return (-1);
+		}
+	case IPPROTO_SCTP:
+	{
+		size_t len;
+		len = (size_t)*option_len;
+		errno = sctp_getopt(so, option_name, option_value, &len, NULL);
+		*option_len = (socklen_t)len;
+		if (errno) {
+			return (-1);
+		} else {
+			return (0);
+		}
+	}
+	default:
+		errno = ENOPROTOOPT;
+		return (-1);
+	}
+}
+int
+userspace_getsockopt(struct socket *so, int level, int option_name,
+void *option_value, socklen_t *option_len)
+{
+	return (usrsctp_getsockopt(so, level, option_name, option_value, option_len));
+}
+int
+usrsctp_bindx(struct socket *so, struct sockaddr *addrs, int addrcnt, int flags)
+{
+	struct sctp_getaddresses *gaddrs;
+	struct sockaddr *sa;
+#ifdef INET
+	struct sockaddr_in *sin;
+#endif
+#ifdef INET6
+	struct sockaddr_in6 *sin6;
+#endif
+	int i;
+	size_t argsz;
+#if defined(INET) || defined(INET6)
+	uint16_t sport = 0;
+#endif
+	/* validate the flags */
+	if ((flags != SCTP_BINDX_ADD_ADDR) &&
+	    (flags != SCTP_BINDX_REM_ADDR)) {
+		errno = EFAULT;
+		return (-1);
+	}
+	/* validate the address count and list */
+	if ((addrcnt <= 0) || (addrs == NULL)) {
+		errno = EINVAL;
+		return (-1);
+	}
+	/* First pre-screen the addresses */
+	sa = addrs;
+	for (i = 0; i < addrcnt; i++) {
+		switch (sa->sa_family) {
+#ifdef INET
+		case AF_INET:
+#ifdef HAVE_SA_LEN
+			if (sa->sa_len != sizeof(struct sockaddr_in)) {
+				errno = EINVAL;
+				return (-1);
+			}
+#endif
+			sin = (struct sockaddr_in *)sa;
+			if (sin->sin_port) {
+				/* non-zero port, check or save */
+				if (sport) {
+					/* Check against our port */
+					if (sport != sin->sin_port) {
+						errno = EINVAL;
+						return (-1);
+					}
+				} else {
+					/* save off the port */
+					sport = sin->sin_port;
+				}
+			}
+#ifndef HAVE_SA_LEN
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in));
+#endif
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+#ifdef HAVE_SA_LEN
+			if (sa->sa_len != sizeof(struct sockaddr_in6)) {
+				errno = EINVAL;
+				return (-1);
+			}
+#endif
+			sin6 = (struct sockaddr_in6 *)sa;
+			if (sin6->sin6_port) {
+				/* non-zero port, check or save */
+				if (sport) {
+					/* Check against our port */
+					if (sport != sin6->sin6_port) {
+						errno = EINVAL;
+						return (-1);
+					}
+				} else {
+					/* save off the port */
+					sport = sin6->sin6_port;
+				}
+			}
+#ifndef HAVE_SA_LEN
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in6));
+#endif
+			break;
+#endif
+		default:
+			/* Invalid address family specified. */
+			errno = EAFNOSUPPORT;
+			return (-1);
+		}
+#ifdef HAVE_SA_LEN
+		sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
+#endif
+	}
+	argsz = sizeof(struct sctp_getaddresses) +
+	        sizeof(struct sockaddr_storage);
+	if ((gaddrs = (struct sctp_getaddresses *)malloc(argsz)) == NULL) {
+		errno = ENOMEM;
+		return (-1);
+	}
+	sa = addrs;
+	for (i = 0; i < addrcnt; i++) {
+#ifndef HAVE_SA_LEN
+		size_t sa_len;
+#endif
+		memset(gaddrs, 0, argsz);
+		gaddrs->sget_assoc_id = 0;
+#ifdef HAVE_SA_LEN
+		memcpy(gaddrs->addr, sa, sa->sa_len);
+		if (usrsctp_setsockopt(so, IPPROTO_SCTP, flags, gaddrs, (socklen_t)argsz) != 0) {
+			free(gaddrs);
+			return (-1);
+		}
+		sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
+#else
+		switch (sa->sa_family) {
+#ifdef INET
+		case AF_INET:
+			sa_len = sizeof(struct sockaddr_in);
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			sa_len = sizeof(struct sockaddr_in6);
+			break;
+#endif
+		default:
+			sa_len = 0;
+			break;
+		}
+		memcpy(gaddrs->addr, sa, sa_len);
+		/*
+		 * Now, if there was a port mentioned, assure that the
+		 * first address has that port to make sure it fails or
+		 * succeeds correctly.
+		 */
+		if ((i == 0) && (sport != 0)) {
+			switch (gaddrs->addr->sa_family) {
+#ifdef INET
+			case AF_INET:
+				sin = (struct sockaddr_in *)gaddrs->addr;
+				sin->sin_port = sport;
+				break;
+#endif
+#ifdef INET6
+			case AF_INET6:
+				sin6 = (struct sockaddr_in6 *)gaddrs->addr;
+				sin6->sin6_port = sport;
+				break;
+#endif
+			}
+		}
+		if (usrsctp_setsockopt(so, IPPROTO_SCTP, flags, gaddrs, (socklen_t)argsz) != 0) {
+			free(gaddrs);
+			return (-1);
+		}
+		sa = (struct sockaddr *)((caddr_t)sa + sa_len);
+#endif
+	}
+	free(gaddrs);
+	return (0);
+}
+int
+usrsctp_connectx(struct socket *so,
+const struct sockaddr *addrs, int addrcnt,
+sctp_assoc_t *id)
+{
+#if defined(INET) || defined(INET6)
+	char buf[SCTP_STACK_BUF_SIZE];
+	int i, ret, cnt, *aa;
+	char *cpto;
+	const struct sockaddr *at;
+	sctp_assoc_t *p_id;
+	size_t len = sizeof(int);
+	/* validate the address count and list */
+	if ((addrs == NULL) || (addrcnt <= 0)) {
+		errno = EINVAL;
+		return (-1);
+	}
+	at = addrs;
+	cnt = 0;
+	cpto = ((caddr_t)buf + sizeof(int));
+	/* validate all the addresses and get the size */
+	for (i = 0; i < addrcnt; i++) {
+		switch (at->sa_family) {
+#ifdef INET
+		case AF_INET:
+#ifdef HAVE_SA_LEN
+			if (at->sa_len != sizeof(struct sockaddr_in)) {
+				errno = EINVAL;
+				return (-1);
+			}
+#endif
+			memcpy(cpto, at, sizeof(struct sockaddr_in));
+			cpto = ((caddr_t)cpto + sizeof(struct sockaddr_in));
+			len += sizeof(struct sockaddr_in);
+			at = (struct sockaddr *)((caddr_t)at + sizeof(struct sockaddr_in));
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+#ifdef HAVE_SA_LEN
+			if (at->sa_len != sizeof(struct sockaddr_in6)) {
+				errno = EINVAL;
+				return (-1);
+			}
+#endif
+			if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)at)->sin6_addr)) {
+				in6_sin6_2_sin((struct sockaddr_in *)cpto, (struct sockaddr_in6 *)at);
+				cpto = ((caddr_t)cpto + sizeof(struct sockaddr_in));
+				len += sizeof(struct sockaddr_in);
+			} else {
+				memcpy(cpto, at, sizeof(struct sockaddr_in6));
+				cpto = ((caddr_t)cpto + sizeof(struct sockaddr_in6));
+				len += sizeof(struct sockaddr_in6);
+			}
+			at = (struct sockaddr *)((caddr_t)at + sizeof(struct sockaddr_in6));
+			break;
+#endif
+		default:
+			errno = EINVAL;
+			return (-1);
+		}
+		if (len > (sizeof(buf) - sizeof(int))) {
+			/* Never enough memory */
+			errno = E2BIG;
+			return (-1);
+		}
+		cnt++;
+	}
+	/* do we have any? */
+	if (cnt == 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	aa = (int *)buf;
+	*aa = cnt;
+	ret = usrsctp_setsockopt(so, IPPROTO_SCTP, SCTP_CONNECT_X, (void *)buf, (socklen_t)len);
+	if ((ret == 0) && id) {
+		p_id = (sctp_assoc_t *)buf;
+		*id = *p_id;
+	}
+	return (ret);
+#else
+	errno = EINVAL;
+	return (-1);
+#endif
+}
+int
+usrsctp_getpaddrs(struct socket *so, sctp_assoc_t id, struct sockaddr **raddrs)
+{
+	struct sctp_getaddresses *addrs;
+	struct sockaddr *sa;
+	sctp_assoc_t asoc;
+	caddr_t lim;
+	socklen_t opt_len;
+	int cnt;
+	if (raddrs == NULL) {
+		errno = EFAULT;
+		return (-1);
+	}
+	asoc = id;
+	opt_len = (socklen_t)sizeof(sctp_assoc_t);
+	if (usrsctp_getsockopt(so, IPPROTO_SCTP, SCTP_GET_REMOTE_ADDR_SIZE, &asoc, &opt_len) != 0) {
+		return (-1);
+	}
+	/* size required is returned in 'asoc' */
+	opt_len = (socklen_t)((size_t)asoc + sizeof(struct sctp_getaddresses));
+	addrs = calloc(1, (size_t)opt_len);
+	if (addrs == NULL) {
+		errno = ENOMEM;
+		return (-1);
+	}
+	addrs->sget_assoc_id = id;
+	/* Now lets get the array of addresses */
+	if (usrsctp_getsockopt(so, IPPROTO_SCTP, SCTP_GET_PEER_ADDRESSES, addrs, &opt_len) != 0) {
+		free(addrs);
+		return (-1);
+	}
+	*raddrs = (struct sockaddr *)&addrs->addr[0];
+	cnt = 0;
+	sa = (struct sockaddr *)&addrs->addr[0];
+	lim = (caddr_t)addrs + opt_len;
+#ifdef HAVE_SA_LEN
+	while (((caddr_t)sa < lim) && (sa->sa_len > 0)) {
+		sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
+#else
+	while ((caddr_t)sa < lim) {
+		switch (sa->sa_family) {
+#ifdef INET
+		case AF_INET:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in));
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in6));
+			break;
+#endif
+		case AF_CONN:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_conn));
+			break;
+		default:
+			return (cnt);
+			break;
+		}
+#endif
+		cnt++;
+	}
+	return (cnt);
+}
+void
+usrsctp_freepaddrs(struct sockaddr *addrs)
+{
+	/* Take away the hidden association id */
+	void *fr_addr;
+	fr_addr = (void *)((caddr_t)addrs - sizeof(sctp_assoc_t));
+	/* Now free it */
+	free(fr_addr);
+}
+int
+usrsctp_getladdrs(struct socket *so, sctp_assoc_t id, struct sockaddr **raddrs)
+{
+	struct sctp_getaddresses *addrs;
+	caddr_t lim;
+	struct sockaddr *sa;
+	size_t size_of_addresses;
+	socklen_t opt_len;
+	int cnt;
+	if (raddrs == NULL) {
+		errno = EFAULT;
+		return (-1);
+	}
+	size_of_addresses = 0;
+	opt_len = (socklen_t)sizeof(int);
+	if (usrsctp_getsockopt(so, IPPROTO_SCTP, SCTP_GET_LOCAL_ADDR_SIZE, &size_of_addresses, &opt_len) != 0) {
+		errno = ENOMEM;
+		return (-1);
+	}
+	if (size_of_addresses == 0) {
+		errno = ENOTCONN;
+		return (-1);
+	}
+	opt_len = (socklen_t)(size_of_addresses +
+	                      sizeof(struct sockaddr_storage) +
+	                      sizeof(struct sctp_getaddresses));
+	addrs = calloc(1, (size_t)opt_len);
+	if (addrs == NULL) {
+		errno = ENOMEM;
+		return (-1);
+	}
+	addrs->sget_assoc_id = id;
+	/* Now lets get the array of addresses */
+	if (usrsctp_getsockopt(so, IPPROTO_SCTP, SCTP_GET_LOCAL_ADDRESSES, addrs, &opt_len) != 0) {
+		free(addrs);
+		errno = ENOMEM;
+		return (-1);
+	}
+	*raddrs = (struct sockaddr *)&addrs->addr[0];
+	cnt = 0;
+	sa = (struct sockaddr *)&addrs->addr[0];
+	lim = (caddr_t)addrs + opt_len;
+#ifdef HAVE_SA_LEN
+	while (((caddr_t)sa < lim) && (sa->sa_len > 0)) {
+		sa = (struct sockaddr *)((caddr_t)sa + sa->sa_len);
+#else
+	while ((caddr_t)sa < lim) {
+		switch (sa->sa_family) {
+#ifdef INET
+		case AF_INET:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in));
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_in6));
+			break;
+#endif
+		case AF_CONN:
+			sa = (struct sockaddr *)((caddr_t)sa + sizeof(struct sockaddr_conn));
+			break;
+		default:
+			return (cnt);
+			break;
+		}
+#endif
+		cnt++;
+	}
+	return (cnt);
+}
+void
+usrsctp_freeladdrs(struct sockaddr *addrs)
+{
+	/* Take away the hidden association id */
+	void *fr_addr;
+	fr_addr = (void *)((caddr_t)addrs - sizeof(sctp_assoc_t));
+	/* Now free it */
+	free(fr_addr);
+}
+#ifdef INET
+void
+sctp_userspace_ip_output(int *result, struct mbuf *o_pak,
+sctp_route_t *ro, void *stcb,
+uint32_t vrf_id)
+{
+	struct mbuf *m;
+	struct mbuf *m_orig;
+	int iovcnt;
+	int send_len;
+	int len;
+	int send_count;
+	struct ip *ip;
+	struct udphdr *udp;
+#if !defined (__Userspace_os_Windows)
+	int res;
+#endif
+	struct sockaddr_in dst;
+#if defined (__Userspace_os_Windows)
+	WSAMSG win_msg_hdr;
+	int win_sent_len;
+	WSABUF send_iovec[MAXLEN_MBUF_CHAIN];
+	WSABUF winbuf;
+#else
+	struct iovec send_iovec[MAXLEN_MBUF_CHAIN];
+	struct msghdr msg_hdr;
+#endif
+	int use_udp_tunneling;
+	*result = 0;
+	send_count = 0;
+	m = SCTP_HEADER_TO_CHAIN(o_pak);
+	m_orig = m;
+	len = sizeof(struct ip);
+	if (SCTP_BUF_LEN(m) < len) {
+		if ((m = m_pullup(m, len)) == 0) {
+			SCTP_PRINTF("Can not get the IP header in the first mbuf.\n");
+			return;
+		}
+	}
+	ip = mtod(m, struct ip *);
+	use_udp_tunneling = (ip->ip_p == IPPROTO_UDP);
+	if (use_udp_tunneling) {
+		len = sizeof(struct ip) + sizeof(struct udphdr);
+		if (SCTP_BUF_LEN(m) < len) {
+			if ((m = m_pullup(m, len)) == 0) {
+				SCTP_PRINTF("Can not get the UDP/IP header in the first mbuf.\n");
+				return;
+			}
+			ip = mtod(m, struct ip *);
+		}
+		udp = (struct udphdr *)(ip + 1);
+	} else {
+		udp = NULL;
+	}
+	if (!use_udp_tunneling) {
+		if (ip->ip_src.s_addr == INADDR_ANY) {
+			/* TODO get addr of outgoing interface */
+			SCTP_PRINTF("Why did the SCTP implementation did not choose a source address?\n");
+		}
+		/* TODO need to worry about ro->ro_dst as in ip_output? */
+#if defined(__Userspace_os_Linux) || defined (__Userspace_os_Windows)
+		/* need to put certain fields into network order for Linux */
+		ip->ip_len = htons(ip->ip_len);
+		ip->ip_off = 0;
+#endif
+	}
+	memset((void *)&dst, 0, sizeof(struct sockaddr_in));
+	dst.sin_family = AF_INET;
+	dst.sin_addr.s_addr = ip->ip_dst.s_addr;
+#ifdef HAVE_SIN_LEN
+	dst.sin_len = sizeof(struct sockaddr_in);
+#endif
+	if (use_udp_tunneling) {
+		dst.sin_port = udp->uh_dport;
+	} else {
+		dst.sin_port = 0;
+	}
+	/* tweak the mbuf chain */
+	if (use_udp_tunneling) {
+		m_adj(m, sizeof(struct ip) + sizeof(struct udphdr));
+	}
+	send_len = SCTP_HEADER_LEN(m); /* length of entire packet */
+	send_count = 0;
+	for (iovcnt = 0; m != NULL && iovcnt < MAXLEN_MBUF_CHAIN; m = m->m_next, iovcnt++) {
+#if !defined (__Userspace_os_Windows)
+		send_iovec[iovcnt].iov_base = (caddr_t)m->m_data;
+		send_iovec[iovcnt].iov_len = SCTP_BUF_LEN(m);
+		send_count += send_iovec[iovcnt].iov_len;
+#else
+		send_iovec[iovcnt].buf = (caddr_t)m->m_data;
+		send_iovec[iovcnt].len = SCTP_BUF_LEN(m);
+		send_count += send_iovec[iovcnt].len;
+#endif
+	}
+	if (m != NULL) {
+		SCTP_PRINTF("mbuf chain couldn't be copied completely\n");
+		goto free_mbuf;
+	}
+#if !defined (__Userspace_os_Windows)
+	msg_hdr.msg_name = (struct sockaddr *) &dst;
+	msg_hdr.msg_namelen = sizeof(struct sockaddr_in);
+	msg_hdr.msg_iov = send_iovec;
+	msg_hdr.msg_iovlen = iovcnt;
+	msg_hdr.msg_control = NULL;
+	msg_hdr.msg_controllen = 0;
+	msg_hdr.msg_flags = 0;
+	if ((!use_udp_tunneling) && (SCTP_BASE_VAR(userspace_rawsctp) > -1)) {
+		if ((res = sendmsg(SCTP_BASE_VAR(userspace_rawsctp), &msg_hdr, MSG_DONTWAIT)) != send_len) {
+			*result = errno;
+		}
+	}
+	if ((use_udp_tunneling) && (SCTP_BASE_VAR(userspace_udpsctp) > -1)) {
+		if ((res = sendmsg(SCTP_BASE_VAR(userspace_udpsctp), &msg_hdr, MSG_DONTWAIT)) != send_len) {
+			*result = errno;
+		}
+	}
+#else
+	win_msg_hdr.name = (struct sockaddr *) &dst;
+	win_msg_hdr.namelen = sizeof(struct sockaddr_in);
+	win_msg_hdr.lpBuffers = (LPWSABUF)send_iovec;
+	win_msg_hdr.dwBufferCount = iovcnt;
+	winbuf.len = 0;
+	winbuf.buf = NULL;
+	win_msg_hdr.Control = winbuf;
+	win_msg_hdr.dwFlags = 0;
+	if ((!use_udp_tunneling) && (SCTP_BASE_VAR(userspace_rawsctp) > -1)) {
+		if (WSASendTo(SCTP_BASE_VAR(userspace_rawsctp), (LPWSABUF) send_iovec, iovcnt, &win_sent_len, win_msg_hdr.dwFlags, win_msg_hdr.name, (int) win_msg_hdr.namelen, NULL, NULL) != 0) {
+			*result = WSAGetLastError();
+		} else if (win_sent_len != send_len) {
+			*result = WSAGetLastError();
+		}
+	}
+	if ((use_udp_tunneling) && (SCTP_BASE_VAR(userspace_udpsctp) > -1)) {
+		if (WSASendTo(SCTP_BASE_VAR(userspace_udpsctp), (LPWSABUF) send_iovec, iovcnt, &win_sent_len, win_msg_hdr.dwFlags, win_msg_hdr.name, (int) win_msg_hdr.namelen, NULL, NULL) != 0) {
+			*result = WSAGetLastError();
+		} else if (win_sent_len != send_len) {
+			*result = WSAGetLastError();
+		}
+	}
+#endif
+free_mbuf:
+	sctp_m_freem(m_orig);
+}
+#endif
+#if defined (INET6)
+void sctp_userspace_ip6_output(int *result, struct mbuf *o_pak,
+struct route_in6 *ro, void *stcb,
+uint32_t vrf_id)
+{
+	struct mbuf *m;
+	struct mbuf *m_orig;
+	int iovcnt;
+	int send_len;
+	int len;
+	int send_count;
+	struct ip6_hdr *ip6;
+	struct udphdr *udp;
+#if !defined (__Userspace_os_Windows)
+	int res;
+#endif
+	struct sockaddr_in6 dst;
+#if defined (__Userspace_os_Windows)
+	WSAMSG win_msg_hdr;
+	int win_sent_len;
+	WSABUF send_iovec[MAXLEN_MBUF_CHAIN];
+	WSABUF winbuf;
+#else
+	struct iovec send_iovec[MAXLEN_MBUF_CHAIN];
+	struct msghdr msg_hdr;
+#endif
+	int use_udp_tunneling;
+	*result = 0;
+	send_count = 0;
+	m = SCTP_HEADER_TO_CHAIN(o_pak);
+	m_orig = m;
+	len = sizeof(struct ip6_hdr);
+	if (SCTP_BUF_LEN(m) < len) {
+		if ((m = m_pullup(m, len)) == 0) {
+			SCTP_PRINTF("Can not get the IP header in the first mbuf.\n");
+			return;
+		}
+	}
+	ip6 = mtod(m, struct ip6_hdr *);
+	use_udp_tunneling = (ip6->ip6_nxt == IPPROTO_UDP);
+	if (use_udp_tunneling) {
+		len = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
+		if (SCTP_BUF_LEN(m) < len) {
+			if ((m = m_pullup(m, len)) == 0) {
+				SCTP_PRINTF("Can not get the UDP/IP header in the first mbuf.\n");
+				return;
+			}
+			ip6 = mtod(m, struct ip6_hdr *);
+		}
+		udp = (struct udphdr *)(ip6 + 1);
+	} else {
+		udp = NULL;
+	}
+	if (!use_udp_tunneling) {
+		if (ip6->ip6_src.s6_addr == in6addr_any.s6_addr) {
+			/* TODO get addr of outgoing interface */
+			SCTP_PRINTF("Why did the SCTP implementation did not choose a source address?\n");
+		}
+		/* TODO need to worry about ro->ro_dst as in ip_output? */
+#if defined(__Userspace_os_Linux) || defined (__Userspace_os_Windows)
+		/* need to put certain fields into network order for Linux */
+		ip6->ip6_plen = htons(ip6->ip6_plen);
+#endif
+	}
+	memset((void *)&dst, 0, sizeof(struct sockaddr_in6));
+	dst.sin6_family = AF_INET6;
+	dst.sin6_addr = ip6->ip6_dst;
+#ifdef HAVE_SIN6_LEN
+	dst.sin6_len = sizeof(struct sockaddr_in6);
+#endif
+	if (use_udp_tunneling) {
+		dst.sin6_port = udp->uh_dport;
+	} else {
+		dst.sin6_port = 0;
+	}
+	/* tweak the mbuf chain */
+	if (use_udp_tunneling) {
+		m_adj(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
+	} else {
+	  m_adj(m, sizeof(struct ip6_hdr));
+	}
+	send_len = SCTP_HEADER_LEN(m); /* length of entire packet */
+	send_count = 0;
+	for (iovcnt = 0; m != NULL && iovcnt < MAXLEN_MBUF_CHAIN; m = m->m_next, iovcnt++) {
+#if !defined (__Userspace_os_Windows)
+		send_iovec[iovcnt].iov_base = (caddr_t)m->m_data;
+		send_iovec[iovcnt].iov_len = SCTP_BUF_LEN(m);
+		send_count += send_iovec[iovcnt].iov_len;
+#else
+		send_iovec[iovcnt].buf = (caddr_t)m->m_data;
+		send_iovec[iovcnt].len = SCTP_BUF_LEN(m);
+		send_count += send_iovec[iovcnt].len;
+#endif
+	}
+	if (m != NULL) {
+		SCTP_PRINTF("mbuf chain couldn't be copied completely\n");
+		goto free_mbuf;
+	}
+#if !defined (__Userspace_os_Windows)
+	msg_hdr.msg_name = (struct sockaddr *) &dst;
+	msg_hdr.msg_namelen = sizeof(struct sockaddr_in6);
+	msg_hdr.msg_iov = send_iovec;
+	msg_hdr.msg_iovlen = iovcnt;
+	msg_hdr.msg_control = NULL;
+	msg_hdr.msg_controllen = 0;
+	msg_hdr.msg_flags = 0;
+	if ((!use_udp_tunneling) && (SCTP_BASE_VAR(userspace_rawsctp6) > -1)) {
+		if ((res = sendmsg(SCTP_BASE_VAR(userspace_rawsctp6), &msg_hdr, MSG_DONTWAIT)) != send_len) {
+			*result = errno;
+		}
+	}
+	if ((use_udp_tunneling) && (SCTP_BASE_VAR(userspace_udpsctp6) > -1)) {
+		if ((res = sendmsg(SCTP_BASE_VAR(userspace_udpsctp6), &msg_hdr, MSG_DONTWAIT)) != send_len) {
+			*result = errno;
+		}
+	}
+#else
+	win_msg_hdr.name = (struct sockaddr *) &dst;
+	win_msg_hdr.namelen = sizeof(struct sockaddr_in6);
+	win_msg_hdr.lpBuffers = (LPWSABUF)send_iovec;
+	win_msg_hdr.dwBufferCount = iovcnt;
+	winbuf.len = 0;
+	winbuf.buf = NULL;
+	win_msg_hdr.Control = winbuf;
+	win_msg_hdr.dwFlags = 0;
+	if ((!use_udp_tunneling) && (SCTP_BASE_VAR(userspace_rawsctp6) > -1)) {
+		if (WSASendTo(SCTP_BASE_VAR(userspace_rawsctp6), (LPWSABUF) send_iovec, iovcnt, &win_sent_len, win_msg_hdr.dwFlags, win_msg_hdr.name, (int) win_msg_hdr.namelen, NULL, NULL) != 0) {
+			*result = WSAGetLastError();
+		} else if (win_sent_len != send_len) {
+			*result = WSAGetLastError();
+		}
+	}
+	if ((use_udp_tunneling) && (SCTP_BASE_VAR(userspace_udpsctp6) > -1)) {
+		if (WSASendTo(SCTP_BASE_VAR(userspace_udpsctp6), (LPWSABUF) send_iovec, iovcnt, &win_sent_len, win_msg_hdr.dwFlags, win_msg_hdr.name, (int) win_msg_hdr.namelen, NULL, NULL) != 0) {
+			*result = WSAGetLastError();
+		} else if (win_sent_len != send_len) {
+			*result = WSAGetLastError();
+		}
+	}
+#endif
+free_mbuf:
+	sctp_m_freem(m_orig);
+}
+#endif
+void
+usrsctp_register_address(void *addr)
+{
+	struct sockaddr_conn sconn;
+	memset(&sconn, 0, sizeof(struct sockaddr_conn));
+	sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+	sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+	sconn.sconn_port = 0;
+	sconn.sconn_addr = addr;
+	sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID,
+	                     NULL,
+	                     0xffffffff,
+	                     0,
+	                     "conn",
+	                     NULL,
+	                     (struct sockaddr *)&sconn,
+	                     0,
+	                     0);
+}
+void
+usrsctp_deregister_address(void *addr)
+{
+	struct sockaddr_conn sconn;
+	memset(&sconn, 0, sizeof(struct sockaddr_conn));
+	sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+	sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+	sconn.sconn_port = 0;
+	sconn.sconn_addr = addr;
+	sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID,
+	                       (struct sockaddr *)&sconn,
+	                       0xffffffff,
+	                       "conn");
+}
+#define PREAMBLE_FORMAT "\n%c %02d:%02d:%02d.%06ld "
+#define PREAMBLE_LENGTH 19
+#define HEADER "0000 "
+#define TRAILER "# SCTP_PACKET\n"
+char *
+usrsctp_dumppacket(void *buf, size_t len, int outbound)
+{
+	size_t i, pos;
+	char *dump_buf, *packet;
+#ifdef _WIN32
+	struct timeb tb;
+	struct tm t;
+#else
+	struct timeval tv;
+	struct tm *t;
+	time_t sec;
+#endif
+	if ((len == 0) || (buf == NULL)) {
+		return (NULL);
+	}
+	if ((dump_buf = malloc(PREAMBLE_LENGTH + strlen(HEADER) + 3 * len + strlen(TRAILER) + 1)) == NULL) {
+		return (NULL);
+	}
+	pos = 0;
+#ifdef _WIN32
+	ftime(&tb);
+	localtime_s(&t, &tb.time);
+	_snprintf_s(dump_buf, PREAMBLE_LENGTH + 1, PREAMBLE_LENGTH, PREAMBLE_FORMAT,
+	            outbound ? 'O' : 'I',
+	            t.tm_hour, t.tm_min, t.tm_sec, (long)(1000 * tb.millitm));
+#else
+	gettimeofday(&tv, NULL);
+	sec = (time_t)tv.tv_sec;
+	t = localtime((const time_t *)&sec);
+	snprintf(dump_buf, PREAMBLE_LENGTH + 1, PREAMBLE_FORMAT,
+	         outbound ? 'O' : 'I',
+	         t->tm_hour, t->tm_min, t->tm_sec, (long)tv.tv_usec);
+#endif
+	pos += PREAMBLE_LENGTH;
+#ifdef _WIN32
+	strncpy_s(dump_buf + pos, strlen(HEADER) + 1, HEADER, strlen(HEADER));
+#else
+	strcpy(dump_buf + pos, HEADER);
+#endif
+	pos += strlen(HEADER);
+	packet = (char *)buf;
+	for (i = 0; i < len; i++) {
+		uint8_t byte, low, high;
+		byte = (uint8_t)packet[i];
+		high = byte / 16;
+		low = byte % 16;
+		dump_buf[pos++] = high < 10 ? '0' + high : 'a' + (high - 10);
+		dump_buf[pos++] = low < 10 ? '0' + low : 'a' + (low - 10);
+		dump_buf[pos++] = ' ';
+	}
+#ifdef _WIN32
+	strncpy_s(dump_buf + pos, strlen(TRAILER) + 1, TRAILER, strlen(TRAILER));
+#else
+	strcpy(dump_buf + pos, TRAILER);
+#endif
+	pos += strlen(TRAILER);
+	dump_buf[pos++] = '\0';
+	return (dump_buf);
+}
+void
+usrsctp_freedumpbuffer(char *buf)
+{
+	free(buf);
+}
+void
+usrsctp_conninput(void *addr, const void *buffer, size_t length, uint8_t ecn_bits)
+{
+	struct sockaddr_conn src, dst;
+	struct mbuf *m;
+	struct sctphdr *sh;
+	struct sctp_chunkhdr *ch;
+	SCTP_STAT_INCR(sctps_recvpackets);
+	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
+	memset(&src, 0, sizeof(struct sockaddr_conn));
+	src.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+	src.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+	src.sconn_addr = addr;
+	memset(&dst, 0, sizeof(struct sockaddr_conn));
+	dst.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+	dst.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+	dst.sconn_addr = addr;
+	if ((m = sctp_get_mbuf_for_msg(length, 1, M_NOWAIT, 0, MT_DATA)) == NULL) {
+		return;
+	}
+	m_copyback(m, 0, length, (caddr_t)buffer);
+	if (SCTP_BUF_LEN(m) < (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr))) {
+		if ((m = m_pullup(m, sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr))) == NULL) {
+			SCTP_STAT_INCR(sctps_hdrops);
+			return;
+		}
+	}
+	sh = mtod(m, struct sctphdr *);;
+	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
+	src.sconn_port = sh->src_port;
+	dst.sconn_port = sh->dest_port;
+	sctp_common_input_processing(&m, 0, sizeof(struct sctphdr), length,
+	                             (struct sockaddr *)&src,
+	                             (struct sockaddr *)&dst,
+	                             sh, ch,
+#if !defined(SCTP_WITH_NO_CSUM)
+	                             1,
+#endif
+	                             ecn_bits,
+	                             SCTP_DEFAULT_VRFID, 0);
+	if (m) {
+		sctp_m_freem(m);
+	}
+	return;
+}
+#define USRSCTP_SYSCTL_SET_DEF(__field) \
+void usrsctp_sysctl_set_ ## __field(uint32_t value) { \
+	SCTP_BASE_SYSCTL(__field) = value; \
+}
+USRSCTP_SYSCTL_SET_DEF(sctp_sendspace)
+USRSCTP_SYSCTL_SET_DEF(sctp_recvspace)
+USRSCTP_SYSCTL_SET_DEF(sctp_auto_asconf)
+USRSCTP_SYSCTL_SET_DEF(sctp_multiple_asconfs)
+USRSCTP_SYSCTL_SET_DEF(sctp_ecn_enable)
+USRSCTP_SYSCTL_SET_DEF(sctp_strict_sacks)
+#if !defined(SCTP_WITH_NO_CSUM)
+USRSCTP_SYSCTL_SET_DEF(sctp_no_csum_on_loopback)
+#endif
+USRSCTP_SYSCTL_SET_DEF(sctp_peer_chunk_oh)
+USRSCTP_SYSCTL_SET_DEF(sctp_max_burst_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_max_chunks_on_queue)
+USRSCTP_SYSCTL_SET_DEF(sctp_hashtblsize)
+USRSCTP_SYSCTL_SET_DEF(sctp_pcbtblsize)
+USRSCTP_SYSCTL_SET_DEF(sctp_min_split_point)
+USRSCTP_SYSCTL_SET_DEF(sctp_chunkscale)
+USRSCTP_SYSCTL_SET_DEF(sctp_delayed_sack_time_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_sack_freq_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_system_free_resc_limit)
+USRSCTP_SYSCTL_SET_DEF(sctp_asoc_free_resc_limit)
+USRSCTP_SYSCTL_SET_DEF(sctp_heartbeat_interval_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_pmtu_raise_time_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_shutdown_guard_time_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_secret_lifetime_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_rto_max_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_rto_min_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_rto_initial_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_init_rto_max_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_valid_cookie_life_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_init_rtx_max_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_assoc_rtx_max_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_path_rtx_max_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_add_more_threshold)
+USRSCTP_SYSCTL_SET_DEF(sctp_nr_outgoing_streams_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_cmt_on_off)
+USRSCTP_SYSCTL_SET_DEF(sctp_cmt_use_dac)
+USRSCTP_SYSCTL_SET_DEF(sctp_nr_sack_on_off)
+USRSCTP_SYSCTL_SET_DEF(sctp_use_cwnd_based_maxburst)
+USRSCTP_SYSCTL_SET_DEF(sctp_asconf_auth_nochk)
+USRSCTP_SYSCTL_SET_DEF(sctp_auth_disable)
+USRSCTP_SYSCTL_SET_DEF(sctp_nat_friendly)
+USRSCTP_SYSCTL_SET_DEF(sctp_L2_abc_variable)
+USRSCTP_SYSCTL_SET_DEF(sctp_mbuf_threshold_count)
+USRSCTP_SYSCTL_SET_DEF(sctp_do_drain)
+USRSCTP_SYSCTL_SET_DEF(sctp_hb_maxburst)
+USRSCTP_SYSCTL_SET_DEF(sctp_abort_if_one_2_one_hits_limit)
+USRSCTP_SYSCTL_SET_DEF(sctp_strict_data_order)
+USRSCTP_SYSCTL_SET_DEF(sctp_min_residual)
+USRSCTP_SYSCTL_SET_DEF(sctp_max_retran_chunk)
+USRSCTP_SYSCTL_SET_DEF(sctp_logging_level)
+USRSCTP_SYSCTL_SET_DEF(sctp_default_cc_module)
+USRSCTP_SYSCTL_SET_DEF(sctp_default_frag_interleave)
+USRSCTP_SYSCTL_SET_DEF(sctp_mobility_base)
+USRSCTP_SYSCTL_SET_DEF(sctp_mobility_fasthandoff)
+USRSCTP_SYSCTL_SET_DEF(sctp_inits_include_nat_friendly)
+USRSCTP_SYSCTL_SET_DEF(sctp_udp_tunneling_port)
+USRSCTP_SYSCTL_SET_DEF(sctp_enable_sack_immediately)
+USRSCTP_SYSCTL_SET_DEF(sctp_vtag_time_wait)
+USRSCTP_SYSCTL_SET_DEF(sctp_blackhole)
+USRSCTP_SYSCTL_SET_DEF(sctp_fr_max_burst_default)
+USRSCTP_SYSCTL_SET_DEF(sctp_path_pf_threshold)
+USRSCTP_SYSCTL_SET_DEF(sctp_default_ss_module)
+USRSCTP_SYSCTL_SET_DEF(sctp_rttvar_bw)
+USRSCTP_SYSCTL_SET_DEF(sctp_rttvar_rtt)
+USRSCTP_SYSCTL_SET_DEF(sctp_rttvar_eqret)
+USRSCTP_SYSCTL_SET_DEF(sctp_steady_step)
+USRSCTP_SYSCTL_SET_DEF(sctp_use_dccc_ecn)
+USRSCTP_SYSCTL_SET_DEF(sctp_buffer_splitting)
+USRSCTP_SYSCTL_SET_DEF(sctp_initial_cwnd)
+#ifdef SCTP_DEBUG
+USRSCTP_SYSCTL_SET_DEF(sctp_debug_on)
+#endif
+#define USRSCTP_SYSCTL_GET_DEF(__field) \
+uint32_t usrsctp_sysctl_get_ ## __field(void) { \
+	return SCTP_BASE_SYSCTL(__field); \
+}
+USRSCTP_SYSCTL_GET_DEF(sctp_sendspace)
+USRSCTP_SYSCTL_GET_DEF(sctp_recvspace)
+USRSCTP_SYSCTL_GET_DEF(sctp_auto_asconf)
+USRSCTP_SYSCTL_GET_DEF(sctp_multiple_asconfs)
+USRSCTP_SYSCTL_GET_DEF(sctp_ecn_enable)
+USRSCTP_SYSCTL_GET_DEF(sctp_strict_sacks)
+#if !defined(SCTP_WITH_NO_CSUM)
+USRSCTP_SYSCTL_GET_DEF(sctp_no_csum_on_loopback)
+#endif
+USRSCTP_SYSCTL_GET_DEF(sctp_peer_chunk_oh)
+USRSCTP_SYSCTL_GET_DEF(sctp_max_burst_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_max_chunks_on_queue)
+USRSCTP_SYSCTL_GET_DEF(sctp_hashtblsize)
+USRSCTP_SYSCTL_GET_DEF(sctp_pcbtblsize)
+USRSCTP_SYSCTL_GET_DEF(sctp_min_split_point)
+USRSCTP_SYSCTL_GET_DEF(sctp_chunkscale)
+USRSCTP_SYSCTL_GET_DEF(sctp_delayed_sack_time_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_sack_freq_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_system_free_resc_limit)
+USRSCTP_SYSCTL_GET_DEF(sctp_asoc_free_resc_limit)
+USRSCTP_SYSCTL_GET_DEF(sctp_heartbeat_interval_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_pmtu_raise_time_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_shutdown_guard_time_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_secret_lifetime_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_rto_max_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_rto_min_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_rto_initial_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_init_rto_max_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_valid_cookie_life_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_init_rtx_max_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_assoc_rtx_max_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_path_rtx_max_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_add_more_threshold)
+USRSCTP_SYSCTL_GET_DEF(sctp_nr_outgoing_streams_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_cmt_on_off)
+USRSCTP_SYSCTL_GET_DEF(sctp_cmt_use_dac)
+USRSCTP_SYSCTL_GET_DEF(sctp_nr_sack_on_off)
+USRSCTP_SYSCTL_GET_DEF(sctp_use_cwnd_based_maxburst)
+USRSCTP_SYSCTL_GET_DEF(sctp_asconf_auth_nochk)
+USRSCTP_SYSCTL_GET_DEF(sctp_auth_disable)
+USRSCTP_SYSCTL_GET_DEF(sctp_nat_friendly)
+USRSCTP_SYSCTL_GET_DEF(sctp_L2_abc_variable)
+USRSCTP_SYSCTL_GET_DEF(sctp_mbuf_threshold_count)
+USRSCTP_SYSCTL_GET_DEF(sctp_do_drain)
+USRSCTP_SYSCTL_GET_DEF(sctp_hb_maxburst)
+USRSCTP_SYSCTL_GET_DEF(sctp_abort_if_one_2_one_hits_limit)
+USRSCTP_SYSCTL_GET_DEF(sctp_strict_data_order)
+USRSCTP_SYSCTL_GET_DEF(sctp_min_residual)
+USRSCTP_SYSCTL_GET_DEF(sctp_max_retran_chunk)
+USRSCTP_SYSCTL_GET_DEF(sctp_logging_level)
+USRSCTP_SYSCTL_GET_DEF(sctp_default_cc_module)
+USRSCTP_SYSCTL_GET_DEF(sctp_default_frag_interleave)
+USRSCTP_SYSCTL_GET_DEF(sctp_mobility_base)
+USRSCTP_SYSCTL_GET_DEF(sctp_mobility_fasthandoff)
+USRSCTP_SYSCTL_GET_DEF(sctp_inits_include_nat_friendly)
+USRSCTP_SYSCTL_GET_DEF(sctp_udp_tunneling_port)
+USRSCTP_SYSCTL_GET_DEF(sctp_enable_sack_immediately)
+USRSCTP_SYSCTL_GET_DEF(sctp_vtag_time_wait)
+USRSCTP_SYSCTL_GET_DEF(sctp_blackhole)
+USRSCTP_SYSCTL_GET_DEF(sctp_fr_max_burst_default)
+USRSCTP_SYSCTL_GET_DEF(sctp_path_pf_threshold)
+USRSCTP_SYSCTL_GET_DEF(sctp_default_ss_module)
+USRSCTP_SYSCTL_GET_DEF(sctp_rttvar_bw)
+USRSCTP_SYSCTL_GET_DEF(sctp_rttvar_rtt)
+USRSCTP_SYSCTL_GET_DEF(sctp_rttvar_eqret)
+USRSCTP_SYSCTL_GET_DEF(sctp_steady_step)
+USRSCTP_SYSCTL_GET_DEF(sctp_use_dccc_ecn)
+USRSCTP_SYSCTL_GET_DEF(sctp_buffer_splitting)
+USRSCTP_SYSCTL_GET_DEF(sctp_initial_cwnd)
+#ifdef SCTP_DEBUG
+USRSCTP_SYSCTL_GET_DEF(sctp_debug_on)
+#endif
+void usrsctp_get_stat(struct sctpstat *stat)
+{
+	*stat = SCTP_BASE_STATS;
+}

The Tor Browser / file comparison

comparison: netwerk/sctp/src/user_socket.c

netwerk/sctp/src/user_socket.c