1/*-
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994, 1995
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2007-2008,2010
5 * Swinburne University of Technology, Melbourne, Australia.
6 * Copyright (c) 2009-2010 Lawrence Stewart <lstewart@freebsd.org>
7 * Copyright (c) 2010 The FreeBSD Foundation
8 * Copyright (c) 2010-2011 Juniper Networks, Inc.

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43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45 * SUCH DAMAGE.
46 *
47 * @(#)tcp_input.c 8.12 (Berkeley) 5/24/95
48 */
49
50#include <sys/cdefs.h>
51__FBSDID("$FreeBSD: head/sys/netinet/tcp_input.c 288914 2015-10-06 07:46:19Z hiren $");
52
53#include "opt_ipfw.h" /* for ipfw_fwd */
54#include "opt_inet.h"
55#include "opt_inet6.h"
56#include "opt_ipsec.h"
57#include "opt_tcpdebug.h"
58
59#include <sys/param.h>

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99#include <netinet6/ip6_var.h>
100#include <netinet6/nd6.h>
101#include <netinet/tcp_fsm.h>
102#include <netinet/tcp_seq.h>
103#include <netinet/tcp_timer.h>
104#include <netinet/tcp_var.h>
105#include <netinet6/tcp6_var.h>
106#include <netinet/tcpip.h>
107#include <netinet/tcp_syncache.h>
108#ifdef TCPDEBUG
109#include <netinet/tcp_debug.h>
110#endif /* TCPDEBUG */
111#ifdef TCP_OFFLOAD
112#include <netinet/tcp_offload.h>
113#endif
114

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1519#endif
1520 }
1521 INP_WLOCK_ASSERT(tp->t_inpcb);
1522 KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN",
1523 __func__));
1524 KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT",
1525 __func__));
1526
1527 /*
1528 * Segment received on connection.
1529 * Reset idle time and keep-alive timer.
1530 * XXX: This should be done after segment
1531 * validation to ignore broken/spoofed segs.
1532 */
1533 tp->t_rcvtime = ticks;
1534 if (TCPS_HAVEESTABLISHED(tp->t_state))

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