Move files to match FreeBSD layout

1 files changed, 1886 insertions, 0 deletions

diff --git a/freebsd/sys/netinet/tcp_usrreq.c b/freebsd/sys/netinet/tcp_usrreq.c
new file mode 100644
index 00000000..fc083e05
--- /dev/null
+++ b/freebsd/sys/netinet/tcp_usrreq.c
@@ -0,0 +1,1886 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (c) 1982, 1986, 1988, 1993
+ *	The Regents of the University of California.
+ * Copyright (c) 2006-2007 Robert N. M. Watson
+ * 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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	From: @(#)tcp_usrreq.c	8.2 (Berkeley) 1/3/94
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/local/opt_ddb.h>
+#include <freebsd/local/opt_inet.h>
+#include <freebsd/local/opt_inet6.h>
+#include <freebsd/local/opt_tcpdebug.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/sysctl.h>
+#include <freebsd/sys/mbuf.h>
+#ifdef INET6
+#include <freebsd/sys/domain.h>
+#endif /* INET6 */
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/socketvar.h>
+#include <freebsd/sys/protosw.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/jail.h>
+
+#ifdef DDB
+#include <freebsd/ddb/ddb.h>
+#endif
+
+#include <freebsd/net/if.h>
+#include <freebsd/net/route.h>
+#include <freebsd/net/vnet.h>
+
+#include <freebsd/netinet/in.h>
+#include <freebsd/netinet/in_systm.h>
+#ifdef INET6
+#include <freebsd/netinet/ip6.h>
+#endif
+#include <freebsd/netinet/in_pcb.h>
+#ifdef INET6
+#include <freebsd/netinet6/in6_pcb.h>
+#endif
+#include <freebsd/netinet/in_var.h>
+#include <freebsd/netinet/ip_var.h>
+#ifdef INET6
+#include <freebsd/netinet6/ip6_var.h>
+#include <freebsd/netinet6/scope6_var.h>
+#endif
+#include <freebsd/netinet/tcp.h>
+#include <freebsd/netinet/tcp_fsm.h>
+#include <freebsd/netinet/tcp_seq.h>
+#include <freebsd/netinet/tcp_timer.h>
+#include <freebsd/netinet/tcp_var.h>
+#include <freebsd/netinet/tcpip.h>
+#ifdef TCPDEBUG
+#include <freebsd/netinet/tcp_debug.h>
+#endif
+#include <freebsd/netinet/tcp_offload.h>
+
+/*
+ * TCP protocol interface to socket abstraction.
+ */
+static int	tcp_attach(struct socket *);
+static int	tcp_connect(struct tcpcb *, struct sockaddr *,
+		    struct thread *td);
+#ifdef INET6
+static int	tcp6_connect(struct tcpcb *, struct sockaddr *,
+		    struct thread *td);
+#endif /* INET6 */
+static void	tcp_disconnect(struct tcpcb *);
+static void	tcp_usrclosed(struct tcpcb *);
+static void	tcp_fill_info(struct tcpcb *, struct tcp_info *);
+
+#ifdef TCPDEBUG
+#define	TCPDEBUG0	int ostate = 0
+#define	TCPDEBUG1()	ostate = tp ? tp->t_state : 0
+#define	TCPDEBUG2(req)	if (tp && (so->so_options & SO_DEBUG)) \
+				tcp_trace(TA_USER, ostate, tp, 0, 0, req)
+#else
+#define	TCPDEBUG0
+#define	TCPDEBUG1()
+#define	TCPDEBUG2(req)
+#endif
+
+/*
+ * TCP attaches to socket via pru_attach(), reserving space,
+ * and an internet control block.
+ */
+static int
+tcp_usr_attach(struct socket *so, int proto, struct thread *td)
+{
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	int error;
+	TCPDEBUG0;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
+	TCPDEBUG1();
+
+	error = tcp_attach(so);
+	if (error)
+		goto out;
+
+	if ((so->so_options & SO_LINGER) && so->so_linger == 0)
+		so->so_linger = TCP_LINGERTIME;
+
+	inp = sotoinpcb(so);
+	tp = intotcpcb(inp);
+out:
+	TCPDEBUG2(PRU_ATTACH);
+	return error;
+}
+
+/*
+ * tcp_detach is called when the socket layer loses its final reference
+ * to the socket, be it a file descriptor reference, a reference from TCP,
+ * etc.  At this point, there is only one case in which we will keep around
+ * inpcb state: time wait.
+ *
+ * This function can probably be re-absorbed back into tcp_usr_detach() now
+ * that there is a single detach path.
+ */
+static void
+tcp_detach(struct socket *so, struct inpcb *inp)
+{
+	struct tcpcb *tp;
+
+	INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+	INP_WLOCK_ASSERT(inp);
+
+	KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
+	KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
+
+	tp = intotcpcb(inp);
+
+	if (inp->inp_flags & INP_TIMEWAIT) {
+		/*
+		 * There are two cases to handle: one in which the time wait
+		 * state is being discarded (INP_DROPPED), and one in which
+		 * this connection will remain in timewait.  In the former,
+		 * it is time to discard all state (except tcptw, which has
+		 * already been discarded by the timewait close code, which
+		 * should be further up the call stack somewhere).  In the
+		 * latter case, we detach from the socket, but leave the pcb
+		 * present until timewait ends.
+		 *
+		 * XXXRW: Would it be cleaner to free the tcptw here?
+		 */
+		if (inp->inp_flags & INP_DROPPED) {
+			KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
+			    "INP_DROPPED && tp != NULL"));
+			in_pcbdetach(inp);
+			in_pcbfree(inp);
+		} else {
+			in_pcbdetach(inp);
+			INP_WUNLOCK(inp);
+		}
+	} else {
+		/*
+		 * If the connection is not in timewait, we consider two
+		 * two conditions: one in which no further processing is
+		 * necessary (dropped || embryonic), and one in which TCP is
+		 * not yet done, but no longer requires the socket, so the
+		 * pcb will persist for the time being.
+		 *
+		 * XXXRW: Does the second case still occur?
+		 */
+		if (inp->inp_flags & INP_DROPPED ||
+		    tp->t_state < TCPS_SYN_SENT) {
+			tcp_discardcb(tp);
+			in_pcbdetach(inp);
+			in_pcbfree(inp);
+		} else
+			in_pcbdetach(inp);
+	}
+}
+
+/*
+ * pru_detach() detaches the TCP protocol from the socket.
+ * If the protocol state is non-embryonic, then can't
+ * do this directly: have to initiate a pru_disconnect(),
+ * which may finish later; embryonic TCB's can just
+ * be discarded here.
+ */
+static void
+tcp_usr_detach(struct socket *so)
+{
+	struct inpcb *inp;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
+	INP_INFO_WLOCK(&V_tcbinfo);
+	INP_WLOCK(inp);
+	KASSERT(inp->inp_socket != NULL,
+	    ("tcp_usr_detach: inp_socket == NULL"));
+	tcp_detach(so, inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+}
+
+/*
+ * Give the socket an address.
+ */
+static int
+tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	struct sockaddr_in *sinp;
+
+	sinp = (struct sockaddr_in *)nam;
+	if (nam->sa_len != sizeof (*sinp))
+		return (EINVAL);
+	/*
+	 * Must check for multicast addresses and disallow binding
+	 * to them.
+	 */
+	if (sinp->sin_family == AF_INET &&
+	    IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
+		return (EAFNOSUPPORT);
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	error = in_pcbbind(inp, nam, td->td_ucred);
+out:
+	TCPDEBUG2(PRU_BIND);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+
+	return (error);
+}
+
+#ifdef INET6
+static int
+tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	struct sockaddr_in6 *sin6p;
+
+	sin6p = (struct sockaddr_in6 *)nam;
+	if (nam->sa_len != sizeof (*sin6p))
+		return (EINVAL);
+	/*
+	 * Must check for multicast addresses and disallow binding
+	 * to them.
+	 */
+	if (sin6p->sin6_family == AF_INET6 &&
+	    IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
+		return (EAFNOSUPPORT);
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	inp->inp_vflag &= ~INP_IPV4;
+	inp->inp_vflag |= INP_IPV6;
+	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
+		if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
+			inp->inp_vflag |= INP_IPV4;
+		else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
+			struct sockaddr_in sin;
+
+			in6_sin6_2_sin(&sin, sin6p);
+			inp->inp_vflag |= INP_IPV4;
+			inp->inp_vflag &= ~INP_IPV6;
+			error = in_pcbbind(inp, (struct sockaddr *)&sin,
+			    td->td_ucred);
+			goto out;
+		}
+	}
+	error = in6_pcbbind(inp, nam, td->td_ucred);
+out:
+	TCPDEBUG2(PRU_BIND);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+#endif /* INET6 */
+
+/*
+ * Prepare to accept connections.
+ */
+static int
+tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	SOCK_LOCK(so);
+	error = solisten_proto_check(so);
+	if (error == 0 && inp->inp_lport == 0)
+		error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
+	if (error == 0) {
+		tp->t_state = TCPS_LISTEN;
+		solisten_proto(so, backlog);
+		tcp_offload_listen_open(tp);
+	}
+	SOCK_UNLOCK(so);
+
+out:
+	TCPDEBUG2(PRU_LISTEN);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+
+#ifdef INET6
+static int
+tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	SOCK_LOCK(so);
+	error = solisten_proto_check(so);
+	if (error == 0 && inp->inp_lport == 0) {
+		inp->inp_vflag &= ~INP_IPV4;
+		if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
+			inp->inp_vflag |= INP_IPV4;
+		error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
+	}
+	if (error == 0) {
+		tp->t_state = TCPS_LISTEN;
+		solisten_proto(so, backlog);
+	}
+	SOCK_UNLOCK(so);
+
+out:
+	TCPDEBUG2(PRU_LISTEN);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+#endif /* INET6 */
+
+/*
+ * Initiate connection to peer.
+ * Create a template for use in transmissions on this connection.
+ * Enter SYN_SENT state, and mark socket as connecting.
+ * Start keep-alive timer, and seed output sequence space.
+ * Send initial segment on connection.
+ */
+static int
+tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	struct sockaddr_in *sinp;
+
+	sinp = (struct sockaddr_in *)nam;
+	if (nam->sa_len != sizeof (*sinp))
+		return (EINVAL);
+	/*
+	 * Must disallow TCP ``connections'' to multicast addresses.
+	 */
+	if (sinp->sin_family == AF_INET
+	    && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
+		return (EAFNOSUPPORT);
+	if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
+		return (error);
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	if ((error = tcp_connect(tp, nam, td)) != 0)
+		goto out;
+	error = tcp_output_connect(so, nam);
+out:
+	TCPDEBUG2(PRU_CONNECT);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+
+#ifdef INET6
+static int
+tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	struct sockaddr_in6 *sin6p;
+
+	TCPDEBUG0;
+
+	sin6p = (struct sockaddr_in6 *)nam;
+	if (nam->sa_len != sizeof (*sin6p))
+		return (EINVAL);
+	/*
+	 * Must disallow TCP ``connections'' to multicast addresses.
+	 */
+	if (sin6p->sin6_family == AF_INET6
+	    && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
+		return (EAFNOSUPPORT);
+
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = EINVAL;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
+		struct sockaddr_in sin;
+
+		if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
+			error = EINVAL;
+			goto out;
+		}
+
+		in6_sin6_2_sin(&sin, sin6p);
+		inp->inp_vflag |= INP_IPV4;
+		inp->inp_vflag &= ~INP_IPV6;
+		if ((error = prison_remote_ip4(td->td_ucred,
+		    &sin.sin_addr)) != 0)
+			goto out;
+		if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
+			goto out;
+		error = tcp_output_connect(so, nam);
+		goto out;
+	}
+	inp->inp_vflag &= ~INP_IPV4;
+	inp->inp_vflag |= INP_IPV6;
+	inp->inp_inc.inc_flags |= INC_ISIPV6;
+	if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
+		goto out;
+	if ((error = tcp6_connect(tp, nam, td)) != 0)
+		goto out;
+	error = tcp_output_connect(so, nam);
+
+out:
+	TCPDEBUG2(PRU_CONNECT);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+#endif /* INET6 */
+
+/*
+ * Initiate disconnect from peer.
+ * If connection never passed embryonic stage, just drop;
+ * else if don't need to let data drain, then can just drop anyways,
+ * else have to begin TCP shutdown process: mark socket disconnecting,
+ * drain unread data, state switch to reflect user close, and
+ * send segment (e.g. FIN) to peer.  Socket will be really disconnected
+ * when peer sends FIN and acks ours.
+ *
+ * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
+ */
+static int
+tcp_usr_disconnect(struct socket *so)
+{
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	int error = 0;
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNRESET;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	tcp_disconnect(tp);
+out:
+	TCPDEBUG2(PRU_DISCONNECT);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+
+/*
+ * Accept a connection.  Essentially all the work is done at higher levels;
+ * just return the address of the peer, storing through addr.
+ *
+ * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
+ * and is described in detail in the commit log entry for r175612.  Acquiring
+ * it delays an accept(2) racing with sonewconn(), which inserts the socket
+ * before the inpcb address/port fields are initialized.  A better fix would
+ * prevent the socket from being placed in the listen queue until all fields
+ * are fully initialized.
+ */
+static int
+tcp_usr_accept(struct socket *so, struct sockaddr **nam)
+{
+	int error = 0;
+	struct inpcb *inp = NULL;
+	struct tcpcb *tp = NULL;
+	struct in_addr addr;
+	in_port_t port = 0;
+	TCPDEBUG0;
+
+	if (so->so_state & SS_ISDISCONNECTED)
+		return (ECONNABORTED);
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
+	INP_INFO_RLOCK(&V_tcbinfo);
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNABORTED;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+
+	/*
+	 * We inline in_getpeeraddr and COMMON_END here, so that we can
+	 * copy the data of interest and defer the malloc until after we
+	 * release the lock.
+	 */
+	port = inp->inp_fport;
+	addr = inp->inp_faddr;
+
+out:
+	TCPDEBUG2(PRU_ACCEPT);
+	INP_WUNLOCK(inp);
+	INP_INFO_RUNLOCK(&V_tcbinfo);
+	if (error == 0)
+		*nam = in_sockaddr(port, &addr);
+	return error;
+}
+
+#ifdef INET6
+static int
+tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
+{
+	struct inpcb *inp = NULL;
+	int error = 0;
+	struct tcpcb *tp = NULL;
+	struct in_addr addr;
+	struct in6_addr addr6;
+	in_port_t port = 0;
+	int v4 = 0;
+	TCPDEBUG0;
+
+	if (so->so_state & SS_ISDISCONNECTED)
+		return (ECONNABORTED);
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNABORTED;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+
+	/*
+	 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
+	 * copy the data of interest and defer the malloc until after we
+	 * release the lock.
+	 */
+	if (inp->inp_vflag & INP_IPV4) {
+		v4 = 1;
+		port = inp->inp_fport;
+		addr = inp->inp_faddr;
+	} else {
+		port = inp->inp_fport;
+		addr6 = inp->in6p_faddr;
+	}
+
+out:
+	TCPDEBUG2(PRU_ACCEPT);
+	INP_WUNLOCK(inp);
+	if (error == 0) {
+		if (v4)
+			*nam = in6_v4mapsin6_sockaddr(port, &addr);
+		else
+			*nam = in6_sockaddr(port, &addr6);
+	}
+	return error;
+}
+#endif /* INET6 */
+
+/*
+ * Mark the connection as being incapable of further output.
+ */
+static int
+tcp_usr_shutdown(struct socket *so)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+
+	TCPDEBUG0;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNRESET;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	socantsendmore(so);
+	tcp_usrclosed(tp);
+	if (!(inp->inp_flags & INP_DROPPED))
+		error = tcp_output_disconnect(tp);
+
+out:
+	TCPDEBUG2(PRU_SHUTDOWN);
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+
+	return (error);
+}
+
+/*
+ * After a receive, possibly send window update to peer.
+ */
+static int
+tcp_usr_rcvd(struct socket *so, int flags)
+{
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	int error = 0;
+
+	TCPDEBUG0;
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNRESET;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	tcp_output_rcvd(tp);
+
+out:
+	TCPDEBUG2(PRU_RCVD);
+	INP_WUNLOCK(inp);
+	return (error);
+}
+
+/*
+ * Do a send by putting data in output queue and updating urgent
+ * marker if URG set.  Possibly send more data.  Unlike the other
+ * pru_*() routines, the mbuf chains are our responsibility.  We
+ * must either enqueue them or free them.  The other pru_* routines
+ * generally are caller-frees.
+ */
+static int
+tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
+    struct sockaddr *nam, struct mbuf *control, struct thread *td)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	int headlocked = 0;
+#ifdef INET6
+	int isipv6;
+#endif
+	TCPDEBUG0;
+
+	/*
+	 * We require the pcbinfo lock in two cases:
+	 *
+	 * (1) An implied connect is taking place, which can result in
+	 *     binding IPs and ports and hence modification of the pcb hash
+	 *     chains.
+	 *
+	 * (2) PRUS_EOF is set, resulting in explicit close on the send.
+	 */
+	if ((nam != NULL) || (flags & PRUS_EOF)) {
+		INP_INFO_WLOCK(&V_tcbinfo);
+		headlocked = 1;
+	}
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		if (control)
+			m_freem(control);
+		if (m)
+			m_freem(m);
+		error = ECONNRESET;
+		goto out;
+	}
+#ifdef INET6
+	isipv6 = nam && nam->sa_family == AF_INET6;
+#endif /* INET6 */
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	if (control) {
+		/* TCP doesn't do control messages (rights, creds, etc) */
+		if (control->m_len) {
+			m_freem(control);
+			if (m)
+				m_freem(m);
+			error = EINVAL;
+			goto out;
+		}
+		m_freem(control);	/* empty control, just free it */
+	}
+	if (!(flags & PRUS_OOB)) {
+		sbappendstream(&so->so_snd, m);
+		if (nam && tp->t_state < TCPS_SYN_SENT) {
+			/*
+			 * Do implied connect if not yet connected,
+			 * initialize window to default value, and
+			 * initialize maxseg/maxopd using peer's cached
+			 * MSS.
+			 */
+			INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+#ifdef INET6
+			if (isipv6)
+				error = tcp6_connect(tp, nam, td);
+			else
+#endif /* INET6 */
+			error = tcp_connect(tp, nam, td);
+			if (error)
+				goto out;
+			tp->snd_wnd = TTCP_CLIENT_SND_WND;
+			tcp_mss(tp, -1);
+		}
+		if (flags & PRUS_EOF) {
+			/*
+			 * Close the send side of the connection after
+			 * the data is sent.
+			 */
+			INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+			socantsendmore(so);
+			tcp_usrclosed(tp);
+		}
+		if (headlocked) {
+			INP_INFO_WUNLOCK(&V_tcbinfo);
+			headlocked = 0;
+		}
+		if (!(inp->inp_flags & INP_DROPPED)) {
+			if (flags & PRUS_MORETOCOME)
+				tp->t_flags |= TF_MORETOCOME;
+			error = tcp_output_send(tp);
+			if (flags & PRUS_MORETOCOME)
+				tp->t_flags &= ~TF_MORETOCOME;
+		}
+	} else {
+		/*
+		 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
+		 */
+		SOCKBUF_LOCK(&so->so_snd);
+		if (sbspace(&so->so_snd) < -512) {
+			SOCKBUF_UNLOCK(&so->so_snd);
+			m_freem(m);
+			error = ENOBUFS;
+			goto out;
+		}
+		/*
+		 * According to RFC961 (Assigned Protocols),
+		 * the urgent pointer points to the last octet
+		 * of urgent data.  We continue, however,
+		 * to consider it to indicate the first octet
+		 * of data past the urgent section.
+		 * Otherwise, snd_up should be one lower.
+		 */
+		sbappendstream_locked(&so->so_snd, m);
+		SOCKBUF_UNLOCK(&so->so_snd);
+		if (nam && tp->t_state < TCPS_SYN_SENT) {
+			/*
+			 * Do implied connect if not yet connected,
+			 * initialize window to default value, and
+			 * initialize maxseg/maxopd using peer's cached
+			 * MSS.
+			 */
+			INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+#ifdef INET6
+			if (isipv6)
+				error = tcp6_connect(tp, nam, td);
+			else
+#endif /* INET6 */
+			error = tcp_connect(tp, nam, td);
+			if (error)
+				goto out;
+			tp->snd_wnd = TTCP_CLIENT_SND_WND;
+			tcp_mss(tp, -1);
+			INP_INFO_WUNLOCK(&V_tcbinfo);
+			headlocked = 0;
+		} else if (nam) {
+			INP_INFO_WUNLOCK(&V_tcbinfo);
+			headlocked = 0;
+		}
+		tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
+		tp->t_flags |= TF_FORCEDATA;
+		error = tcp_output_send(tp);
+		tp->t_flags &= ~TF_FORCEDATA;
+	}
+out:
+	TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
+		  ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
+	INP_WUNLOCK(inp);
+	if (headlocked)
+		INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (error);
+}
+
+/*
+ * Abort the TCP.  Drop the connection abruptly.
+ */
+static void
+tcp_usr_abort(struct socket *so)
+{
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	TCPDEBUG0;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_tcbinfo);
+	INP_WLOCK(inp);
+	KASSERT(inp->inp_socket != NULL,
+	    ("tcp_usr_abort: inp_socket == NULL"));
+
+	/*
+	 * If we still have full TCP state, and we're not dropped, drop.
+	 */
+	if (!(inp->inp_flags & INP_TIMEWAIT) &&
+	    !(inp->inp_flags & INP_DROPPED)) {
+		tp = intotcpcb(inp);
+		TCPDEBUG1();
+		tcp_drop(tp, ECONNABORTED);
+		TCPDEBUG2(PRU_ABORT);
+	}
+	if (!(inp->inp_flags & INP_DROPPED)) {
+		SOCK_LOCK(so);
+		so->so_state |= SS_PROTOREF;
+		SOCK_UNLOCK(so);
+		inp->inp_flags |= INP_SOCKREF;
+	}
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+}
+
+/*
+ * TCP socket is closed.  Start friendly disconnect.
+ */
+static void
+tcp_usr_close(struct socket *so)
+{
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+	TCPDEBUG0;
+
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
+
+	INP_INFO_WLOCK(&V_tcbinfo);
+	INP_WLOCK(inp);
+	KASSERT(inp->inp_socket != NULL,
+	    ("tcp_usr_close: inp_socket == NULL"));
+
+	/*
+	 * If we still have full TCP state, and we're not dropped, initiate
+	 * a disconnect.
+	 */
+	if (!(inp->inp_flags & INP_TIMEWAIT) &&
+	    !(inp->inp_flags & INP_DROPPED)) {
+		tp = intotcpcb(inp);
+		TCPDEBUG1();
+		tcp_disconnect(tp);
+		TCPDEBUG2(PRU_CLOSE);
+	}
+	if (!(inp->inp_flags & INP_DROPPED)) {
+		SOCK_LOCK(so);
+		so->so_state |= SS_PROTOREF;
+		SOCK_UNLOCK(so);
+		inp->inp_flags |= INP_SOCKREF;
+	}
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+}
+
+/*
+ * Receive out-of-band data.
+ */
+static int
+tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
+{
+	int error = 0;
+	struct inpcb *inp;
+	struct tcpcb *tp = NULL;
+
+	TCPDEBUG0;
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
+	INP_WLOCK(inp);
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		error = ECONNRESET;
+		goto out;
+	}
+	tp = intotcpcb(inp);
+	TCPDEBUG1();
+	if ((so->so_oobmark == 0 &&
+	     (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
+	    so->so_options & SO_OOBINLINE ||
+	    tp->t_oobflags & TCPOOB_HADDATA) {
+		error = EINVAL;
+		goto out;
+	}
+	if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
+		error = EWOULDBLOCK;
+		goto out;
+	}
+	m->m_len = 1;
+	*mtod(m, caddr_t) = tp->t_iobc;
+	if ((flags & MSG_PEEK) == 0)
+		tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
+
+out:
+	TCPDEBUG2(PRU_RCVOOB);
+	INP_WUNLOCK(inp);
+	return (error);
+}
+
+struct pr_usrreqs tcp_usrreqs = {
+	.pru_abort =		tcp_usr_abort,
+	.pru_accept =		tcp_usr_accept,
+	.pru_attach =		tcp_usr_attach,
+	.pru_bind =		tcp_usr_bind,
+	.pru_connect =		tcp_usr_connect,
+	.pru_control =		in_control,
+	.pru_detach =		tcp_usr_detach,
+	.pru_disconnect =	tcp_usr_disconnect,
+	.pru_listen =		tcp_usr_listen,
+	.pru_peeraddr =		in_getpeeraddr,
+	.pru_rcvd =		tcp_usr_rcvd,
+	.pru_rcvoob =		tcp_usr_rcvoob,
+	.pru_send =		tcp_usr_send,
+	.pru_shutdown =		tcp_usr_shutdown,
+	.pru_sockaddr =		in_getsockaddr,
+#if 0
+	.pru_soreceive =	soreceive_stream,
+#endif
+	.pru_sosetlabel =	in_pcbsosetlabel,
+	.pru_close =		tcp_usr_close,
+};
+
+#ifdef INET6
+struct pr_usrreqs tcp6_usrreqs = {
+	.pru_abort =		tcp_usr_abort,
+	.pru_accept =		tcp6_usr_accept,
+	.pru_attach =		tcp_usr_attach,
+	.pru_bind =		tcp6_usr_bind,
+	.pru_connect =		tcp6_usr_connect,
+	.pru_control =		in6_control,
+	.pru_detach =		tcp_usr_detach,
+	.pru_disconnect =	tcp_usr_disconnect,
+	.pru_listen =		tcp6_usr_listen,
+	.pru_peeraddr =		in6_mapped_peeraddr,
+	.pru_rcvd =		tcp_usr_rcvd,
+	.pru_rcvoob =		tcp_usr_rcvoob,
+	.pru_send =		tcp_usr_send,
+	.pru_shutdown =		tcp_usr_shutdown,
+	.pru_sockaddr =		in6_mapped_sockaddr,
+#if 0
+	.pru_soreceive =	soreceive_stream,
+#endif
+ 	.pru_sosetlabel =	in_pcbsosetlabel,
+	.pru_close =		tcp_usr_close,
+};
+#endif /* INET6 */
+
+/*
+ * Common subroutine to open a TCP connection to remote host specified
+ * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
+ * port number if needed.  Call in_pcbconnect_setup to do the routing and
+ * to choose a local host address (interface).  If there is an existing
+ * incarnation of the same connection in TIME-WAIT state and if the remote
+ * host was sending CC options and if the connection duration was < MSL, then
+ * truncate the previous TIME-WAIT state and proceed.
+ * Initialize connection parameters and enter SYN-SENT state.
+ */
+static int
+tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
+{
+	struct inpcb *inp = tp->t_inpcb, *oinp;
+	struct socket *so = inp->inp_socket;
+	struct in_addr laddr;
+	u_short lport;
+	int error;
+
+	INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+	INP_WLOCK_ASSERT(inp);
+
+	if (inp->inp_lport == 0) {
+		error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
+		if (error)
+			return error;
+	}
+
+	/*
+	 * Cannot simply call in_pcbconnect, because there might be an
+	 * earlier incarnation of this same connection still in
+	 * TIME_WAIT state, creating an ADDRINUSE error.
+	 */
+	laddr = inp->inp_laddr;
+	lport = inp->inp_lport;
+	error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
+	    &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
+	if (error && oinp == NULL)
+		return error;
+	if (oinp)
+		return EADDRINUSE;
+	inp->inp_laddr = laddr;
+	in_pcbrehash(inp);
+
+	/*
+	 * Compute window scaling to request:
+	 * Scale to fit into sweet spot.  See tcp_syncache.c.
+	 * XXX: This should move to tcp_output().
+	 */
+	while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
+	    (TCP_MAXWIN << tp->request_r_scale) < sb_max)
+		tp->request_r_scale++;
+
+	soisconnecting(so);
+	TCPSTAT_INC(tcps_connattempt);
+	tp->t_state = TCPS_SYN_SENT;
+	tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
+	tp->iss = tcp_new_isn(tp);
+	tp->t_bw_rtseq = tp->iss;
+	tcp_sendseqinit(tp);
+
+	return 0;
+}
+
+#ifdef INET6
+static int
+tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
+{
+	struct inpcb *inp = tp->t_inpcb, *oinp;
+	struct socket *so = inp->inp_socket;
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
+	struct in6_addr addr6;
+	int error;
+
+	INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+	INP_WLOCK_ASSERT(inp);
+
+	if (inp->inp_lport == 0) {
+		error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
+		if (error)
+			return error;
+	}
+
+	/*
+	 * Cannot simply call in_pcbconnect, because there might be an
+	 * earlier incarnation of this same connection still in
+	 * TIME_WAIT state, creating an ADDRINUSE error.
+	 * in6_pcbladdr() also handles scope zone IDs.
+	 */
+	error = in6_pcbladdr(inp, nam, &addr6);
+	if (error)
+		return error;
+	oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
+				  &sin6->sin6_addr, sin6->sin6_port,
+				  IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
+				  ? &addr6
+				  : &inp->in6p_laddr,
+				  inp->inp_lport,  0, NULL);
+	if (oinp)
+		return EADDRINUSE;
+	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
+		inp->in6p_laddr = addr6;
+	inp->in6p_faddr = sin6->sin6_addr;
+	inp->inp_fport = sin6->sin6_port;
+	/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
+	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
+	if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
+		inp->inp_flow |=
+		    (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
+	in_pcbrehash(inp);
+
+	/* Compute window scaling to request.  */
+	while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
+	    (TCP_MAXWIN << tp->request_r_scale) < sb_max)
+		tp->request_r_scale++;
+
+	soisconnecting(so);
+	TCPSTAT_INC(tcps_connattempt);
+	tp->t_state = TCPS_SYN_SENT;
+	tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
+	tp->iss = tcp_new_isn(tp);
+	tp->t_bw_rtseq = tp->iss;
+	tcp_sendseqinit(tp);
+
+	return 0;
+}
+#endif /* INET6 */
+
+/*
+ * Export TCP internal state information via a struct tcp_info, based on the
+ * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
+ * (TCP state machine, etc).  We export all information using FreeBSD-native
+ * constants -- for example, the numeric values for tcpi_state will differ
+ * from Linux.
+ */
+static void
+tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
+{
+
+	INP_WLOCK_ASSERT(tp->t_inpcb);
+	bzero(ti, sizeof(*ti));
+
+	ti->tcpi_state = tp->t_state;
+	if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
+		ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
+	if (tp->t_flags & TF_SACK_PERMIT)
+		ti->tcpi_options |= TCPI_OPT_SACK;
+	if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
+		ti->tcpi_options |= TCPI_OPT_WSCALE;
+		ti->tcpi_snd_wscale = tp->snd_scale;
+		ti->tcpi_rcv_wscale = tp->rcv_scale;
+	}
+
+	ti->tcpi_rto = tp->t_rxtcur * tick;
+	ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
+	ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
+	ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
+
+	ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
+	ti->tcpi_snd_cwnd = tp->snd_cwnd;
+
+	/*
+	 * FreeBSD-specific extension fields for tcp_info.
+	 */
+	ti->tcpi_rcv_space = tp->rcv_wnd;
+	ti->tcpi_rcv_nxt = tp->rcv_nxt;
+	ti->tcpi_snd_wnd = tp->snd_wnd;
+	ti->tcpi_snd_bwnd = tp->snd_bwnd;
+	ti->tcpi_snd_nxt = tp->snd_nxt;
+	ti->tcpi_snd_mss = tp->t_maxseg;
+	ti->tcpi_rcv_mss = tp->t_maxseg;
+	if (tp->t_flags & TF_TOE)
+		ti->tcpi_options |= TCPI_OPT_TOE;
+}
+
+/*
+ * tcp_ctloutput() must drop the inpcb lock before performing copyin on
+ * socket option arguments.  When it re-acquires the lock after the copy, it
+ * has to revalidate that the connection is still valid for the socket
+ * option.
+ */
+#define INP_WLOCK_RECHECK(inp) do {					\
+	INP_WLOCK(inp);							\
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {		\
+		INP_WUNLOCK(inp);					\
+		return (ECONNRESET);					\
+	}								\
+	tp = intotcpcb(inp);						\
+} while(0)
+
+int
+tcp_ctloutput(struct socket *so, struct sockopt *sopt)
+{
+	int	error, opt, optval;
+	struct	inpcb *inp;
+	struct	tcpcb *tp;
+	struct	tcp_info ti;
+
+	error = 0;
+	inp = sotoinpcb(so);
+	KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
+	INP_WLOCK(inp);
+	if (sopt->sopt_level != IPPROTO_TCP) {
+#ifdef INET6
+		if (inp->inp_vflag & INP_IPV6PROTO) {
+			INP_WUNLOCK(inp);
+			error = ip6_ctloutput(so, sopt);
+		} else {
+#endif /* INET6 */
+			INP_WUNLOCK(inp);
+			error = ip_ctloutput(so, sopt);
+#ifdef INET6
+		}
+#endif
+		return (error);
+	}
+	if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
+		INP_WUNLOCK(inp);
+		return (ECONNRESET);
+	}
+
+	switch (sopt->sopt_dir) {
+	case SOPT_SET:
+		switch (sopt->sopt_name) {
+#ifdef TCP_SIGNATURE
+		case TCP_MD5SIG:
+			INP_WUNLOCK(inp);
+			error = sooptcopyin(sopt, &optval, sizeof optval,
+			    sizeof optval);
+			if (error)
+				return (error);
+
+			INP_WLOCK_RECHECK(inp);
+			if (optval > 0)
+				tp->t_flags |= TF_SIGNATURE;
+			else
+				tp->t_flags &= ~TF_SIGNATURE;
+			INP_WUNLOCK(inp);
+			break;
+#endif /* TCP_SIGNATURE */
+		case TCP_NODELAY:
+		case TCP_NOOPT:
+			INP_WUNLOCK(inp);
+			error = sooptcopyin(sopt, &optval, sizeof optval,
+			    sizeof optval);
+			if (error)
+				return (error);
+
+			INP_WLOCK_RECHECK(inp);
+			switch (sopt->sopt_name) {
+			case TCP_NODELAY:
+				opt = TF_NODELAY;
+				break;
+			case TCP_NOOPT:
+				opt = TF_NOOPT;
+				break;
+			default:
+				opt = 0; /* dead code to fool gcc */
+				break;
+			}
+
+			if (optval)
+				tp->t_flags |= opt;
+			else
+				tp->t_flags &= ~opt;
+			INP_WUNLOCK(inp);
+			break;
+
+		case TCP_NOPUSH:
+			INP_WUNLOCK(inp);
+			error = sooptcopyin(sopt, &optval, sizeof optval,
+			    sizeof optval);
+			if (error)
+				return (error);
+
+			INP_WLOCK_RECHECK(inp);
+			if (optval)
+				tp->t_flags |= TF_NOPUSH;
+			else if (tp->t_flags & TF_NOPUSH) {
+				tp->t_flags &= ~TF_NOPUSH;
+				if (TCPS_HAVEESTABLISHED(tp->t_state))
+					error = tcp_output(tp);
+			}
+			INP_WUNLOCK(inp);
+			break;
+
+		case TCP_MAXSEG:
+			INP_WUNLOCK(inp);
+			error = sooptcopyin(sopt, &optval, sizeof optval,
+			    sizeof optval);
+			if (error)
+				return (error);
+
+			INP_WLOCK_RECHECK(inp);
+			if (optval > 0 && optval <= tp->t_maxseg &&
+			    optval + 40 >= V_tcp_minmss)
+				tp->t_maxseg = optval;
+			else
+				error = EINVAL;
+			INP_WUNLOCK(inp);
+			break;
+
+		case TCP_INFO:
+			INP_WUNLOCK(inp);
+			error = EINVAL;
+			break;
+
+		default:
+			INP_WUNLOCK(inp);
+			error = ENOPROTOOPT;
+			break;
+		}
+		break;
+
+	case SOPT_GET:
+		tp = intotcpcb(inp);
+		switch (sopt->sopt_name) {
+#ifdef TCP_SIGNATURE
+		case TCP_MD5SIG:
+			optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &optval, sizeof optval);
+			break;
+#endif
+
+		case TCP_NODELAY:
+			optval = tp->t_flags & TF_NODELAY;
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &optval, sizeof optval);
+			break;
+		case TCP_MAXSEG:
+			optval = tp->t_maxseg;
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &optval, sizeof optval);
+			break;
+		case TCP_NOOPT:
+			optval = tp->t_flags & TF_NOOPT;
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &optval, sizeof optval);
+			break;
+		case TCP_NOPUSH:
+			optval = tp->t_flags & TF_NOPUSH;
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &optval, sizeof optval);
+			break;
+		case TCP_INFO:
+			tcp_fill_info(tp, &ti);
+			INP_WUNLOCK(inp);
+			error = sooptcopyout(sopt, &ti, sizeof ti);
+			break;
+		default:
+			INP_WUNLOCK(inp);
+			error = ENOPROTOOPT;
+			break;
+		}
+		break;
+	}
+	return (error);
+}
+#undef INP_WLOCK_RECHECK
+
+/*
+ * tcp_sendspace and tcp_recvspace are the default send and receive window
+ * sizes, respectively.  These are obsolescent (this information should
+ * be set by the route).
+ */
+u_long	tcp_sendspace = 1024*32;
+SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
+    &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
+u_long	tcp_recvspace = 1024*64;
+SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
+    &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
+
+/*
+ * Attach TCP protocol to socket, allocating
+ * internet protocol control block, tcp control block,
+ * bufer space, and entering LISTEN state if to accept connections.
+ */
+static int
+tcp_attach(struct socket *so)
+{
+	struct tcpcb *tp;
+	struct inpcb *inp;
+	int error;
+
+	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+		error = soreserve(so, tcp_sendspace, tcp_recvspace);
+		if (error)
+			return (error);
+	}
+	so->so_rcv.sb_flags |= SB_AUTOSIZE;
+	so->so_snd.sb_flags |= SB_AUTOSIZE;
+	INP_INFO_WLOCK(&V_tcbinfo);
+	error = in_pcballoc(so, &V_tcbinfo);
+	if (error) {
+		INP_INFO_WUNLOCK(&V_tcbinfo);
+		return (error);
+	}
+	inp = sotoinpcb(so);
+#ifdef INET6
+	if (inp->inp_vflag & INP_IPV6PROTO) {
+		inp->inp_vflag |= INP_IPV6;
+		inp->in6p_hops = -1;	/* use kernel default */
+	}
+	else
+#endif
+	inp->inp_vflag |= INP_IPV4;
+	tp = tcp_newtcpcb(inp);
+	if (tp == NULL) {
+		in_pcbdetach(inp);
+		in_pcbfree(inp);
+		INP_INFO_WUNLOCK(&V_tcbinfo);
+		return (ENOBUFS);
+	}
+	tp->t_state = TCPS_CLOSED;
+	INP_WUNLOCK(inp);
+	INP_INFO_WUNLOCK(&V_tcbinfo);
+	return (0);
+}
+
+/*
+ * Initiate (or continue) disconnect.
+ * If embryonic state, just send reset (once).
+ * If in ``let data drain'' option and linger null, just drop.
+ * Otherwise (hard), mark socket disconnecting and drop
+ * current input data; switch states based on user close, and
+ * send segment to peer (with FIN).
+ */
+static void
+tcp_disconnect(struct tcpcb *tp)
+{
+	struct inpcb *inp = tp->t_inpcb;
+	struct socket *so = inp->inp_socket;
+
+	INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+	INP_WLOCK_ASSERT(inp);
+
+	/*
+	 * Neither tcp_close() nor tcp_drop() should return NULL, as the
+	 * socket is still open.
+	 */
+	if (tp->t_state < TCPS_ESTABLISHED) {
+		tp = tcp_close(tp);
+		KASSERT(tp != NULL,
+		    ("tcp_disconnect: tcp_close() returned NULL"));
+	} else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
+		tp = tcp_drop(tp, 0);
+		KASSERT(tp != NULL,
+		    ("tcp_disconnect: tcp_drop() returned NULL"));
+	} else {
+		soisdisconnecting(so);
+		sbflush(&so->so_rcv);
+		tcp_usrclosed(tp);
+		if (!(inp->inp_flags & INP_DROPPED))
+			tcp_output_disconnect(tp);
+	}
+}
+
+/*
+ * User issued close, and wish to trail through shutdown states:
+ * if never received SYN, just forget it.  If got a SYN from peer,
+ * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
+ * If already got a FIN from peer, then almost done; go to LAST_ACK
+ * state.  In all other cases, have already sent FIN to peer (e.g.
+ * after PRU_SHUTDOWN), and just have to play tedious game waiting
+ * for peer to send FIN or not respond to keep-alives, etc.
+ * We can let the user exit from the close as soon as the FIN is acked.
+ */
+static void
+tcp_usrclosed(struct tcpcb *tp)
+{
+
+	INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
+	INP_WLOCK_ASSERT(tp->t_inpcb);
+
+	switch (tp->t_state) {
+	case TCPS_LISTEN:
+		tcp_offload_listen_close(tp);
+		/* FALLTHROUGH */
+	case TCPS_CLOSED:
+		tp->t_state = TCPS_CLOSED;
+		tp = tcp_close(tp);
+		/*
+		 * tcp_close() should never return NULL here as the socket is
+		 * still open.
+		 */
+		KASSERT(tp != NULL,
+		    ("tcp_usrclosed: tcp_close() returned NULL"));
+		break;
+
+	case TCPS_SYN_SENT:
+	case TCPS_SYN_RECEIVED:
+		tp->t_flags |= TF_NEEDFIN;
+		break;
+
+	case TCPS_ESTABLISHED:
+		tp->t_state = TCPS_FIN_WAIT_1;
+		break;
+
+	case TCPS_CLOSE_WAIT:
+		tp->t_state = TCPS_LAST_ACK;
+		break;
+	}
+	if (tp->t_state >= TCPS_FIN_WAIT_2) {
+		soisdisconnected(tp->t_inpcb->inp_socket);
+		/* Prevent the connection hanging in FIN_WAIT_2 forever. */
+		if (tp->t_state == TCPS_FIN_WAIT_2) {
+			int timeout;
+
+			timeout = (tcp_fast_finwait2_recycle) ? 
+			    tcp_finwait2_timeout : tcp_maxidle;
+			tcp_timer_activate(tp, TT_2MSL, timeout);
+		}
+	}
+}
+
+#ifdef DDB
+static void
+db_print_indent(int indent)
+{
+	int i;
+
+	for (i = 0; i < indent; i++)
+		db_printf(" ");
+}
+
+static void
+db_print_tstate(int t_state)
+{
+
+	switch (t_state) {
+	case TCPS_CLOSED:
+		db_printf("TCPS_CLOSED");
+		return;
+
+	case TCPS_LISTEN:
+		db_printf("TCPS_LISTEN");
+		return;
+
+	case TCPS_SYN_SENT:
+		db_printf("TCPS_SYN_SENT");
+		return;
+
+	case TCPS_SYN_RECEIVED:
+		db_printf("TCPS_SYN_RECEIVED");
+		return;
+
+	case TCPS_ESTABLISHED:
+		db_printf("TCPS_ESTABLISHED");
+		return;
+
+	case TCPS_CLOSE_WAIT:
+		db_printf("TCPS_CLOSE_WAIT");
+		return;
+
+	case TCPS_FIN_WAIT_1:
+		db_printf("TCPS_FIN_WAIT_1");
+		return;
+
+	case TCPS_CLOSING:
+		db_printf("TCPS_CLOSING");
+		return;
+
+	case TCPS_LAST_ACK:
+		db_printf("TCPS_LAST_ACK");
+		return;
+
+	case TCPS_FIN_WAIT_2:
+		db_printf("TCPS_FIN_WAIT_2");
+		return;
+
+	case TCPS_TIME_WAIT:
+		db_printf("TCPS_TIME_WAIT");
+		return;
+
+	default:
+		db_printf("unknown");
+		return;
+	}
+}
+
+static void
+db_print_tflags(u_int t_flags)
+{
+	int comma;
+
+	comma = 0;
+	if (t_flags & TF_ACKNOW) {
+		db_printf("%sTF_ACKNOW", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_DELACK) {
+		db_printf("%sTF_DELACK", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NODELAY) {
+		db_printf("%sTF_NODELAY", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NOOPT) {
+		db_printf("%sTF_NOOPT", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_SENTFIN) {
+		db_printf("%sTF_SENTFIN", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_REQ_SCALE) {
+		db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_RCVD_SCALE) {
+		db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_REQ_TSTMP) {
+		db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_RCVD_TSTMP) {
+		db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_SACK_PERMIT) {
+		db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NEEDSYN) {
+		db_printf("%sTF_NEEDSYN", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NEEDFIN) {
+		db_printf("%sTF_NEEDFIN", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NOPUSH) {
+		db_printf("%sTF_NOPUSH", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_NOPUSH) {
+		db_printf("%sTF_NOPUSH", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_MORETOCOME) {
+		db_printf("%sTF_MORETOCOME", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_LQ_OVERFLOW) {
+		db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_LASTIDLE) {
+		db_printf("%sTF_LASTIDLE", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_RXWIN0SENT) {
+		db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_FASTRECOVERY) {
+		db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_WASFRECOVERY) {
+		db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_SIGNATURE) {
+		db_printf("%sTF_SIGNATURE", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_FORCEDATA) {
+		db_printf("%sTF_FORCEDATA", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_TSO) {
+		db_printf("%sTF_TSO", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_flags & TF_ECN_PERMIT) {
+		db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
+		comma = 1;
+	}
+}
+
+static void
+db_print_toobflags(char t_oobflags)
+{
+	int comma;
+
+	comma = 0;
+	if (t_oobflags & TCPOOB_HAVEDATA) {
+		db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
+		comma = 1;
+	}
+	if (t_oobflags & TCPOOB_HADDATA) {
+		db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
+		comma = 1;
+	}
+}
+
+static void
+db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
+{
+
+	db_print_indent(indent);
+	db_printf("%s at %p\n", name, tp);
+
+	indent += 2;
+
+	db_print_indent(indent);
+	db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
+	   LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
+
+	db_print_indent(indent);
+	db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
+	    &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
+
+	db_print_indent(indent);
+	db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
+	    &tp->t_timers->tt_delack, tp->t_inpcb);
+
+	db_print_indent(indent);
+	db_printf("t_state: %d (", tp->t_state);
+	db_print_tstate(tp->t_state);
+	db_printf(")\n");
+
+	db_print_indent(indent);
+	db_printf("t_flags: 0x%x (", tp->t_flags);
+	db_print_tflags(tp->t_flags);
+	db_printf(")\n");
+
+	db_print_indent(indent);
+	db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
+	    tp->snd_una, tp->snd_max, tp->snd_nxt);
+
+	db_print_indent(indent);
+	db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
+	   tp->snd_up, tp->snd_wl1, tp->snd_wl2);
+
+	db_print_indent(indent);
+	db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
+	    tp->iss, tp->irs, tp->rcv_nxt);
+
+	db_print_indent(indent);
+	db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
+	    tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
+
+	db_print_indent(indent);
+	db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
+	   tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
+
+	db_print_indent(indent);
+	db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
+	    "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
+	    tp->snd_recover);
+
+	db_print_indent(indent);
+	db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
+	    tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
+
+	db_print_indent(indent);
+	db_printf("t_rttime: %u   t_rtsq: 0x%08x   t_bw_rtttime: %u\n",
+	    tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
+
+	db_print_indent(indent);
+	db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
+	    "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
+	    tp->t_srtt);
+
+	db_print_indent(indent);
+	db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
+	    "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
+	    tp->t_rttbest);
+
+	db_print_indent(indent);
+	db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
+	    tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
+
+	db_print_indent(indent);
+	db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
+	db_print_toobflags(tp->t_oobflags);
+	db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
+
+	db_print_indent(indent);
+	db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
+	    tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
+
+	db_print_indent(indent);
+	db_printf("ts_recent: %u   ts_recent_age: %u\n",
+	    tp->ts_recent, tp->ts_recent_age);
+
+	db_print_indent(indent);
+	db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
+	    "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
+
+	db_print_indent(indent);
+	db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
+	    "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
+	    tp->snd_recover_prev, tp->t_badrxtwin);
+
+	db_print_indent(indent);
+	db_printf("snd_numholes: %d  snd_holes first: %p\n",
+	    tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
+
+	db_print_indent(indent);
+	db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
+	    "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
+
+	/* Skip sackblks, sackhint. */
+
+	db_print_indent(indent);
+	db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
+	    tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
+}
+
+DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
+{
+	struct tcpcb *tp;
+
+	if (!have_addr) {
+		db_printf("usage: show tcpcb <addr>\n");
+		return;
+	}
+	tp = (struct tcpcb *)addr;
+
+	db_print_tcpcb(tp, "tcpcb", 0);
+}
+#endif