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path: root/include/asm-sparc64/chafsr.h
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/* $Id: chafsr.h,v 1.1 2001/03/28 10:56:34 davem Exp $ */
#ifndef _SPARC64_CHAFSR_H
#define _SPARC64_CHAFSR_H

/* Cheetah Asynchronous Fault Status register, ASI=0x4C VA<63:0>=0x0 */

/* Comments indicate which processor variants on which the bit definition
 * is valid.  Codes are:
 * ch	-->	cheetah
 * ch+	-->	cheetah plus
 * jp	-->	jalapeno
 */

/* All bits of this register except M_SYNDROME and E_SYNDROME are
 * read, write 1 to clear.  M_SYNDROME and E_SYNDROME are read-only.
 */

/* Software bit set by linux trap handlers to indicate that the trap was
 * signalled at %tl >= 1.
 */
#define CHAFSR_TL1		(1UL << 63UL) /* n/a */

/* Unmapped error from system bus for prefetch queue or
 * store queue read operation
 */
#define CHPAFSR_DTO		(1UL << 59UL) /* ch+ */

/* Bus error from system bus for prefetch queue or store queue
 * read operation
 */
#define CHPAFSR_DBERR		(1UL << 58UL) /* ch+ */

/* Hardware corrected E-cache Tag ECC error */
#define CHPAFSR_THCE		(1UL << 57UL) /* ch+ */
/* System interface protocol error, hw timeout caused */
#define JPAFSR_JETO		(1UL << 57UL) /* jp */

/* SW handled correctable E-cache Tag ECC error */
#define CHPAFSR_TSCE		(1UL << 56UL) /* ch+ */
/* Parity error on system snoop results */
#define JPAFSR_SCE		(1UL << 56UL) /* jp */

/* Uncorrectable E-cache Tag ECC error */
#define CHPAFSR_TUE		(1UL << 55UL) /* ch+ */
/* System interface protocol error, illegal command detected */
#define JPAFSR_JEIC		(1UL << 55UL) /* jp */

/* Uncorrectable system bus data ECC error due to prefetch
 * or store fill request
 */
#define CHPAFSR_DUE		(1UL << 54UL) /* ch+ */
/* System interface protocol error, illegal ADTYPE detected */
#define JPAFSR_JEIT		(1UL << 54UL) /* jp */

/* Multiple errors of the same type have occurred.  This bit is set when
 * an uncorrectable error or a SW correctable error occurs and the status
 * bit to report that error is already set.  When multiple errors of
 * different types are indicated by setting multiple status bits.
 *
 * This bit is not set if multiple HW corrected errors with the same
 * status bit occur, only uncorrectable and SW correctable ones have
 * this behavior.
 *
 * This bit is not set when multiple ECC errors happen within a single
 * 64-byte system bus transaction.  Only the first ECC error in a 16-byte
 * subunit will be logged.  All errors in subsequent 16-byte subunits
 * from the same 64-byte transaction are ignored.
 */
#define CHAFSR_ME		(1UL << 53UL) /* ch,ch+,jp */

/* Privileged state error has occurred.  This is a capture of PSTATE.PRIV
 * at the time the error is detected.
 */
#define CHAFSR_PRIV		(1UL << 52UL) /* ch,ch+,jp */

/* The following bits 51 (CHAFSR_PERR) to 33 (CHAFSR_CE) are sticky error
 * bits and record the most recently detected errors.  Bits accumulate
 * errors that have been detected since the last write to clear the bit.
 */

/* System interface protocol error.  The processor asserts its' ERROR
 * pin when this event occurs and it also logs a specific cause code
 * into a JTAG scannable flop.
 */
#define CHAFSR_PERR		(1UL << 51UL) /* ch,ch+,jp */

/* Internal processor error.  The processor asserts its' ERROR
 * pin when this event occurs and it also logs a specific cause code
 * into a JTAG scannable flop.
 */
#define CHAFSR_IERR		(1UL << 50UL) /* ch,ch+,jp */

/* System request parity error on incoming address */
#define CHAFSR_ISAP		(1UL << 49UL) /* ch,ch+,jp */

/* HW Corrected system bus MTAG ECC error */
#define CHAFSR_EMC		(1UL << 48UL) /* ch,ch+ */
/* Parity error on L2 cache tag SRAM */
#define JPAFSR_ETP		(1UL << 48UL) /* jp */

/* Uncorrectable system bus MTAG ECC error */
#define CHAFSR_EMU		(1UL << 47UL) /* ch,ch+ */
/* Out of range memory error has occurred */
#define JPAFSR_OM		(1UL << 47UL) /* jp */

/* HW Corrected system bus data ECC error for read of interrupt vector */
#define CHAFSR_IVC		(1UL << 46UL) /* ch,ch+ */
/* Error due to unsupported store */
#define JPAFSR_UMS		(1UL << 46UL) /* jp */

/* Uncorrectable system bus data ECC error for read of interrupt vector */
#define CHAFSR_IVU		(1UL << 45UL) /* ch,ch+,jp */

/* Unmapped error from system bus */
#define CHAFSR_TO		(1UL << 44UL) /* ch,ch+,jp */

/* Bus error response from system bus */
#define CHAFSR_BERR		(1UL << 43UL) /* ch,ch+,jp */

/* SW Correctable E-cache ECC error for instruction fetch or data access
 * other than block load.
 */
#define CHAFSR_UCC		(1UL << 42UL) /* ch,ch+,jp */

/* Uncorrectable E-cache ECC error for instruction fetch or data access
 * other than block load.
 */
#define CHAFSR_UCU		(1UL << 41UL) /* ch,ch+,jp */

/* Copyout HW Corrected ECC error */
#define CHAFSR_CPC		(1UL << 40UL) /* ch,ch+,jp */

/* Copyout Uncorrectable ECC error */
#define CHAFSR_CPU		(1UL << 39UL) /* ch,ch+,jp */

/* HW Corrected ECC error from E-cache for writeback */
#define CHAFSR_WDC		(1UL << 38UL) /* ch,ch+,jp */

/* Uncorrectable ECC error from E-cache for writeback */
#define CHAFSR_WDU		(1UL << 37UL) /* ch,ch+,jp */

/* HW Corrected ECC error from E-cache for store merge or block load */
#define CHAFSR_EDC		(1UL << 36UL) /* ch,ch+,jp */

/* Uncorrectable ECC error from E-cache for store merge or block load */
#define CHAFSR_EDU		(1UL << 35UL) /* ch,ch+,jp */

/* Uncorrectable system bus data ECC error for read of memory or I/O */
#define CHAFSR_UE		(1UL << 34UL) /* ch,ch+,jp */

/* HW Corrected system bus data ECC error for read of memory or I/O */
#define CHAFSR_CE		(1UL << 33UL) /* ch,ch+,jp */

/* Uncorrectable ECC error from remote cache/memory */
#define JPAFSR_RUE		(1UL << 32UL) /* jp */

/* Correctable ECC error from remote cache/memory */
#define JPAFSR_RCE		(1UL << 31UL) /* jp */

/* JBUS parity error on returned read data */
#define JPAFSR_BP		(1UL << 30UL) /* jp */

/* JBUS parity error on data for writeback or block store */
#define JPAFSR_WBP		(1UL << 29UL) /* jp */

/* Foreign read to DRAM incurring correctable ECC error */
#define JPAFSR_FRC		(1UL << 28UL) /* jp */

/* Foreign read to DRAM incurring uncorrectable ECC error */
#define JPAFSR_FRU		(1UL << 27UL) /* jp */

#define CHAFSR_ERRORS		(CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP | CHAFSR_EMC | \
				 CHAFSR_EMU | CHAFSR_IVC | CHAFSR_IVU | CHAFSR_TO | \
				 CHAFSR_BERR | CHAFSR_UCC | CHAFSR_UCU | CHAFSR_CPC | \
				 CHAFSR_CPU | CHAFSR_WDC | CHAFSR_WDU | CHAFSR_EDC | \
				 CHAFSR_EDU | CHAFSR_UE | CHAFSR_CE)
#define CHPAFSR_ERRORS		(CHPAFSR_DTO | CHPAFSR_DBERR | CHPAFSR_THCE | \
				 CHPAFSR_TSCE | CHPAFSR_TUE | CHPAFSR_DUE | \
				 CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP | CHAFSR_EMC | \
				 CHAFSR_EMU | CHAFSR_IVC | CHAFSR_IVU | CHAFSR_TO | \
				 CHAFSR_BERR | CHAFSR_UCC | CHAFSR_UCU | CHAFSR_CPC | \
				 CHAFSR_CPU | CHAFSR_WDC | CHAFSR_WDU | CHAFSR_EDC | \
				 CHAFSR_EDU | CHAFSR_UE | CHAFSR_CE)
#define JPAFSR_ERRORS		(JPAFSR_JETO | JPAFSR_SCE | JPAFSR_JEIC | \
				 JPAFSR_JEIT | CHAFSR_PERR | CHAFSR_IERR | \
				 CHAFSR_ISAP | JPAFSR_ETP | JPAFSR_OM | \
				 JPAFSR_UMS | CHAFSR_IVU | CHAFSR_TO | \
				 CHAFSR_BERR | CHAFSR_UCC | CHAFSR_UCU | \
				 CHAFSR_CPC | CHAFSR_CPU | CHAFSR_WDC | \
				 CHAFSR_WDU | CHAFSR_EDC | CHAFSR_EDU | \
				 CHAFSR_UE | CHAFSR_CE | JPAFSR_RUE | \
				 JPAFSR_RCE | JPAFSR_BP | JPAFSR_WBP | \
				 JPAFSR_FRC | JPAFSR_FRU)

/* Active JBUS request signal when error occurred */
#define JPAFSR_JBREQ		(0x7UL << 24UL) /* jp */
#define JPAFSR_JBREQ_SHIFT	24UL

/* L2 cache way information */
#define JPAFSR_ETW		(0x3UL << 22UL) /* jp */
#define JPAFSR_ETW_SHIFT	22UL

/* System bus MTAG ECC syndrome.  This field captures the status of the
 * first occurrence of the highest-priority error according to the M_SYND
 * overwrite policy.  After the AFSR sticky bit, corresponding to the error
 * for which the M_SYND is reported, is cleared, the contents of the M_SYND
 * field will be unchanged by will be unfrozen for further error capture.
 */
#define CHAFSR_M_SYNDROME	(0xfUL << 16UL) /* ch,ch+,jp */
#define CHAFSR_M_SYNDROME_SHIFT	16UL

/* Agenid Id of the foreign device causing the UE/CE errors */
#define JPAFSR_AID		(0x1fUL << 9UL) /* jp */
#define JPAFSR_AID_SHIFT	9UL

/* System bus or E-cache data ECC syndrome.  This field captures the status
 * of the first occurrence of the highest-priority error according to the
 * E_SYND overwrite policy.  After the AFSR sticky bit, corresponding to the
 * error for which the E_SYND is reported, is cleare, the contents of the E_SYND
 * field will be unchanged but will be unfrozen for further error capture.
 */
#define CHAFSR_E_SYNDROME	(0x1ffUL << 0UL) /* ch,ch+,jp */
#define CHAFSR_E_SYNDROME_SHIFT	0UL

/* The AFSR must be explicitly cleared by software, it is not cleared automatically
 * by a read.  Writes to bits <51:33> with bits set will clear the corresponding
 * bits in the AFSR.  Bits associated with disrupting traps must be cleared before
 * interrupts are re-enabled to prevent multiple traps for the same error.  I.e.
 * PSTATE.IE and AFSR bits control delivery of disrupting traps.
 *
 * Since there is only one AFAR, when multiple events have been logged by the
 * bits in the AFSR, at most one of these events will have its status captured
 * in the AFAR.  The highest priority of those event bits will get AFAR logging.
 * The AFAR will be unlocked and available to capture the address of another event
 * as soon as the one bit in AFSR that corresponds to the event logged in AFAR is
 * cleared.  For example, if AFSR.CE is detected, then AFSR.UE (which overwrites
 * the AFAR), and AFSR.UE is cleared by not AFSR.CE, then the AFAR will be unlocked
 * and ready for another event, even though AFSR.CE is still set.  The same rules
 * also apply to the M_SYNDROME and E_SYNDROME fields of the AFSR.
 */

#endif /* _SPARC64_CHAFSR_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-27 06:32:26 -0500
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/*
 *	TCP over IPv6
 *	Linux INET6 implementation 
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>	
 *
 *	$Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
 *
 *	Based on: 
 *	linux/net/ipv4/tcp.c
 *	linux/net/ipv4/tcp_input.c
 *	linux/net/ipv4/tcp_output.c
 *
 *	Fixes:
 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
 *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
 *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
 *					a single port at the same time.
 *	YOSHIFUJI Hideaki @USAGI:	convert /proc/net/tcp6 to seq_file.
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/jiffies.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/ipsec.h>
#include <linux/times.h>

#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>

#include <net/tcp.h>
#include <net/ndisc.h>
#include <net/inet6_hashtables.h>
#include <net/inet6_connection_sock.h>
#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/ip6_checksum.h>
#include <net/inet_ecn.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/addrconf.h>
#include <net/snmp.h>
#include <net/dsfield.h>
#include <net/timewait_sock.h>

#include <asm/uaccess.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <linux/crypto.h>
#include <linux/scatterlist.h>

/* Socket used for sending RSTs and ACKs */
static struct socket *tcp6_socket;

static void	tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
static void	tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
static void	tcp_v6_send_check(struct sock *sk, int len, 
				  struct sk_buff *skb);

static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);

static struct inet_connection_sock_af_ops ipv6_mapped;
static struct inet_connection_sock_af_ops ipv6_specific;
#ifdef CONFIG_TCP_MD5SIG
static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
#endif

static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
{
	return inet_csk_get_port(&tcp_hashinfo, sk, snum,
				 inet6_csk_bind_conflict);
}

static void tcp_v6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
			tcp_prot.hash(sk);
			return;
		}
		local_bh_disable();
		__inet6_hash(&tcp_hashinfo, sk);
		local_bh_enable();
	}
}

static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
				   struct in6_addr *saddr, 
				   struct in6_addr *daddr, 
				   __wsum base)
{
	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}

static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
{
	return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
					    skb->nh.ipv6h->saddr.s6_addr32,
					    skb->h.th->dest,
					    skb->h.th->source);
}

static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 
			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
 	struct inet_sock *inet = inet_sk(sk);
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
	struct in6_addr *saddr = NULL, *final_p = NULL, final;
	struct flowi fl;
	struct dst_entry *dst;
	int addr_type;
	int err;

	if (addr_len < SIN6_LEN_RFC2133) 
		return -EINVAL;

	if (usin->sin6_family != AF_INET6) 
		return(-EAFNOSUPPORT);

	memset(&fl, 0, sizeof(fl));

	if (np->sndflow) {
		fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl.fl6_flowlabel);
		if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
			struct ip6_flowlabel *flowlabel;
			flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
			if (flowlabel == NULL)
				return -EINVAL;
			ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
			fl6_sock_release(flowlabel);
		}
	}

	/*
  	 *	connect() to INADDR_ANY means loopback (BSD'ism).
  	 */
  	
  	if(ipv6_addr_any(&usin->sin6_addr))
		usin->sin6_addr.s6_addr[15] = 0x1; 

	addr_type = ipv6_addr_type(&usin->sin6_addr);

	if(addr_type & IPV6_ADDR_MULTICAST)
		return -ENETUNREACH;

	if (addr_type&IPV6_ADDR_LINKLOCAL) {
		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    usin->sin6_scope_id) {
			/* If interface is set while binding, indices
			 * must coincide.
			 */
			if (sk->sk_bound_dev_if &&
			    sk->sk_bound_dev_if != usin->sin6_scope_id)
				return -EINVAL;

			sk->sk_bound_dev_if = usin->sin6_scope_id;
		}

		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if)
			return -EINVAL;
	}

	if (tp->rx_opt.ts_recent_stamp &&
	    !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
		tp->rx_opt.ts_recent = 0;
		tp->rx_opt.ts_recent_stamp = 0;
		tp->write_seq = 0;
	}

	ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
	np->flow_label = fl.fl6_flowlabel;

	/*
	 *	TCP over IPv4
	 */

	if (addr_type == IPV6_ADDR_MAPPED) {
		u32 exthdrlen = icsk->icsk_ext_hdr_len;
		struct sockaddr_in sin;

		SOCK_DEBUG(sk, "connect: ipv4 mapped\n");

		if (__ipv6_only_sock(sk))
			return -ENETUNREACH;

		sin.sin_family = AF_INET;
		sin.sin_port = usin->sin6_port;
		sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];

		icsk->icsk_af_ops = &ipv6_mapped;
		sk->sk_backlog_rcv = tcp_v4_do_rcv;
#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));

		if (err) {
			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
			sk->sk_backlog_rcv = tcp_v6_do_rcv;
#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
			goto failure;
		} else {
			ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
				      inet->saddr);
			ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
				      inet->rcv_saddr);
		}

		return err;
	}

	if (!ipv6_addr_any(&np->rcv_saddr))
		saddr = &np->rcv_saddr;

	fl.proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
	ipv6_addr_copy(&fl.fl6_src,
		       (saddr ? saddr : &np->saddr));
	fl.oif = sk->sk_bound_dev_if;
	fl.fl_ip_dport = usin->sin6_port;
	fl.fl_ip_sport = inet->sport;

	if (np->opt && np->opt->srcrt) {
		struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
		ipv6_addr_copy(&final, &fl.fl6_dst);
		ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
		final_p = &final;
	}

	security_sk_classify_flow(sk, &fl);

	err = ip6_dst_lookup(sk, &dst, &fl);
	if (err)
		goto failure;
	if (final_p)
		ipv6_addr_copy(&fl.fl6_dst, final_p);

	if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
		goto failure;

	if (saddr == NULL) {
		saddr = &fl.fl6_src;
		ipv6_addr_copy(&np->rcv_saddr, saddr);
	}

	/* set the source address */
	ipv6_addr_copy(&np->saddr, saddr);
	inet->rcv_saddr = LOOPBACK4_IPV6;

	sk->sk_gso_type = SKB_GSO_TCPV6;
	__ip6_dst_store(sk, dst, NULL, NULL);

	icsk->icsk_ext_hdr_len = 0;
	if (np->opt)
		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
					  np->opt->opt_nflen);

	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);

	inet->dport = usin->sin6_port;

	tcp_set_state(sk, TCP_SYN_SENT);
	err = inet6_hash_connect(&tcp_death_row, sk);
	if (err)
		goto late_failure;

	if (!tp->write_seq)
		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
							     np->daddr.s6_addr32,
							     inet->sport,
							     inet->dport);

	err = tcp_connect(sk);
	if (err)
		goto late_failure;

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
	inet->dport = 0;
	sk->sk_route_caps = 0;
	return err;
}

static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
		int type, int code, int offset, __be32 info)
{
	struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
	struct tcp_sock *tp; 
	__u32 seq;

	sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr,
			  th->source, skb->dev->ifindex);

	if (sk == NULL) {
		ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
		inet_twsk_put(inet_twsk(sk));
		return;
	}

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
		NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);

	if (sk->sk_state == TCP_CLOSE)
		goto out;

	tp = tcp_sk(sk);
	seq = ntohl(th->seq); 
	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
		NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}

	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
		struct dst_entry *dst = NULL;

		if (sock_owned_by_user(sk))
			goto out;
		if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
			goto out;

		/* icmp should have updated the destination cache entry */
		dst = __sk_dst_check(sk, np->dst_cookie);

		if (dst == NULL) {
			struct inet_sock *inet = inet_sk(sk);
			struct flowi fl;

			/* BUGGG_FUTURE: Again, it is not clear how
			   to handle rthdr case. Ignore this complexity
			   for now.
			 */
			memset(&fl, 0, sizeof(fl));
			fl.proto = IPPROTO_TCP;
			ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
			ipv6_addr_copy(&fl.fl6_src, &np->saddr);
			fl.oif = sk->sk_bound_dev_if;
			fl.fl_ip_dport = inet->dport;
			fl.fl_ip_sport = inet->sport;
			security_skb_classify_flow(skb, &fl);

			if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
				sk->sk_err_soft = -err;
				goto out;
			}

			if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
				sk->sk_err_soft = -err;
				goto out;
			}

		} else
			dst_hold(dst);

		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
			tcp_sync_mss(sk, dst_mtu(dst));
			tcp_simple_retransmit(sk);
		} /* else let the usual retransmit timer handle it */
		dst_release(dst);
		goto out;
	}

	icmpv6_err_convert(type, code, &err);

	/* Might be for an request_sock */
	switch (sk->sk_state) {
		struct request_sock *req, **prev;
	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

		req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
					   &hdr->saddr, inet6_iif(skb));
		if (!req)
			goto out;

		/* ICMPs are not backlogged, hence we cannot get
		 * an established socket here.
		 */
		BUG_TRAP(req->sk == NULL);

		if (seq != tcp_rsk(req)->snt_isn) {
			NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
			goto out;
		}

		inet_csk_reqsk_queue_drop(sk, req, prev);
		goto out;

	case TCP_SYN_SENT:
	case TCP_SYN_RECV:  /* Cannot happen.
			       It can, it SYNs are crossed. --ANK */ 
		if (!sock_owned_by_user(sk)) {
			sk->sk_err = err;
			sk->sk_error_report(sk);		/* Wake people up to see the error (see connect in sock.c) */

			tcp_done(sk);
		} else
			sk->sk_err_soft = err;
		goto out;
	}

	if (!sock_owned_by_user(sk) && np->recverr) {
		sk->sk_err = err;
		sk->sk_error_report(sk);
	} else
		sk->sk_err_soft = err;

out:
	bh_unlock_sock(sk);
	sock_put(sk);
}


static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
			      struct dst_entry *dst)
{
	struct inet6_request_sock *treq = inet6_rsk(req);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
	struct ipv6_txoptions *opt = NULL;
	struct in6_addr * final_p = NULL, final;
	struct flowi fl;
	int err = -1;

	memset(&fl, 0, sizeof(fl));
	fl.proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
	ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
	fl.fl6_flowlabel = 0;
	fl.oif = treq->iif;
	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
	fl.fl_ip_sport = inet_sk(sk)->sport;
	security_req_classify_flow(req, &fl);

	if (dst == NULL) {
		opt = np->opt;
		if (opt == NULL &&
		    np->rxopt.bits.osrcrt == 2 &&
		    treq->pktopts) {
			struct sk_buff *pktopts = treq->pktopts;
			struct inet6_skb_parm *rxopt = IP6CB(pktopts);
			if (rxopt->srcrt)
				opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt));
		}

		if (opt && opt->srcrt) {
			struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
			ipv6_addr_copy(&final, &fl.fl6_dst);
			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
			final_p = &final;
		}

		err = ip6_dst_lookup(sk, &dst, &fl);
		if (err)
			goto done;
		if (final_p)
			ipv6_addr_copy(&fl.fl6_dst, final_p);
		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto done;
	}

	skb = tcp_make_synack(sk, dst, req);
	if (skb) {
		struct tcphdr *th = skb->h.th;

		th->check = tcp_v6_check(th, skb->len,
					 &treq->loc_addr, &treq->rmt_addr,
					 csum_partial((char *)th, skb->len, skb->csum));

		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
		err = ip6_xmit(sk, skb, &fl, opt, 0);
		err = net_xmit_eval(err);
	}

done:
        if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
	return err;
}

static void tcp_v6_reqsk_destructor(struct request_sock *req)
{
	if (inet6_rsk(req)->pktopts)
		kfree_skb(inet6_rsk(req)->pktopts);
}

#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
						   struct in6_addr *addr)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	BUG_ON(tp == NULL);

	if (!tp->md5sig_info || !tp->md5sig_info->entries6)
		return NULL;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
			return (struct tcp_md5sig_key *)&tp->md5sig_info->keys6[i];
	}
	return NULL;
}

static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
						struct sock *addr_sk)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
}

static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
						      struct request_sock *req)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
}

static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
			     char *newkey, u8 newkeylen)
{
	/* Add key to the list */
	struct tcp6_md5sig_key *key;
	struct tcp_sock *tp = tcp_sk(sk);
	struct tcp6_md5sig_key *keys;

	key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer);
	if (key) {
		/* modify existing entry - just update that one */
		kfree(key->key);
		key->key = newkey;
		key->keylen = newkeylen;
	} else {
		/* reallocate new list if current one is full. */
		if (!tp->md5sig_info) {
			tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
			if (!tp->md5sig_info) {
				kfree(newkey);
				return -ENOMEM;
			}
		}
		tcp_alloc_md5sig_pool();
		if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
			keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
				       (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);

			if (!keys) {
				tcp_free_md5sig_pool();
				kfree(newkey);
				return -ENOMEM;
			}

			if (tp->md5sig_info->entries6)
				memmove(keys, tp->md5sig_info->keys6,
					(sizeof (tp->md5sig_info->keys6[0]) *
					 tp->md5sig_info->entries6));

			kfree(tp->md5sig_info->keys6);
			tp->md5sig_info->keys6 = keys;
			tp->md5sig_info->alloced6++;
		}

		ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
			       peer);
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].keylen = newkeylen;

		tp->md5sig_info->entries6++;
	}
	return 0;
}

static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
			       u8 *newkey, __u8 newkeylen)
{
	return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
				 newkey, newkeylen);
}

static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
			/* Free the key */
			kfree(tp->md5sig_info->keys6[i].key);
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;

				tcp_free_md5sig_pool();

				return 0;
			} else {
				/* shrink the database */
				if (tp->md5sig_info->entries6 != i)
					memmove(&tp->md5sig_info->keys6[i],
						&tp->md5sig_info->keys6[i+1],
						(tp->md5sig_info->entries6 - i)
						* sizeof (tp->md5sig_info->keys6[0]));
			}
		}
	}
	return -ENOENT;
}

static void tcp_v6_clear_md5_list (struct sock *sk)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	if (tp->md5sig_info->entries6) {
		for (i = 0; i < tp->md5sig_info->entries6; i++)
			kfree(tp->md5sig_info->keys6[i].key);
		tp->md5sig_info->entries6 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys6);
	tp->md5sig_info->keys6 = NULL;
	tp->md5sig_info->alloced6 = 0;

	if (tp->md5sig_info->entries4) {
		for (i = 0; i < tp->md5sig_info->entries4; i++)
			kfree(tp->md5sig_info->keys4[i].key);
		tp->md5sig_info->entries4 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys4);
	tp->md5sig_info->keys4 = NULL;
	tp->md5sig_info->alloced4 = 0;
}

static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
				  int optlen)
{
	struct tcp_md5sig cmd;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
	u8 *newkey;

	if (optlen < sizeof(cmd))
		return -EINVAL;

	if (copy_from_user(&cmd, optval, sizeof(cmd)))
		return -EFAULT;

	if (sin6->sin6_family != AF_INET6)
		return -EINVAL;

	if (!cmd.tcpm_keylen) {
		if (!tcp_sk(sk)->md5sig_info)
			return -ENOENT;
		if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
			return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
		return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
	}

	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
		return -EINVAL;

	if (!tcp_sk(sk)->md5sig_info) {
		struct tcp_sock *tp = tcp_sk(sk);
		struct tcp_md5sig_info *p;

		p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
		if (!p)
			return -ENOMEM;

		tp->md5sig_info = p;
	}

	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
	if (!newkey)
		return -ENOMEM;
	if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED) {
		return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
					 newkey, cmd.tcpm_keylen);
	}
	return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
}

static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				   struct in6_addr *saddr,
				   struct in6_addr *daddr,
				   struct tcphdr *th, int protocol,
				   int tcplen)
{
	struct scatterlist sg[4];
	__u16 data_len;
	int block = 0;
	__sum16 cksum;
	struct tcp_md5sig_pool *hp;
	struct tcp6_pseudohdr *bp;
	struct hash_desc *desc;
	int err;
	unsigned int nbytes = 0;

	hp = tcp_get_md5sig_pool();
	if (!hp) {
		printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__);
		goto clear_hash_noput;
	}
	bp = &hp->md5_blk.ip6;
	desc = &hp->md5_desc;

	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
	bp->len = htonl(tcplen);
	bp->protocol = htonl(protocol);

	sg_set_buf(&sg[block++], bp, sizeof(*bp));
	nbytes += sizeof(*bp);

	/* 2. TCP header, excluding options */
	cksum = th->check;
	th->check = 0;
	sg_set_buf(&sg[block++], th, sizeof(*th));
	nbytes += sizeof(*th);

	/* 3. TCP segment data (if any) */
	data_len = tcplen - (th->doff << 2);
	if (data_len > 0) {
		u8 *data = (u8 *)th + (th->doff << 2);
		sg_set_buf(&sg[block++], data, data_len);
		nbytes += data_len;
	}

	/* 4. shared key */
	sg_set_buf(&sg[block++], key->key, key->keylen);
	nbytes += key->keylen;

	/* Now store the hash into the packet */
	err = crypto_hash_init(desc);
	if (err) {
		printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
		goto clear_hash;
	}
	err = crypto_hash_update(desc, sg, nbytes);
	if (err) {
		printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
		goto clear_hash;
	}
	err = crypto_hash_final(desc, md5_hash);
	if (err) {
		printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
		goto clear_hash;
	}

	/* Reset header, and free up the crypto */
	tcp_put_md5sig_pool();
	th->check = cksum;
out:
	return 0;
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	goto out;
}

static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				struct sock *sk,
				struct dst_entry *dst,
				struct request_sock *req,
				struct tcphdr *th, int protocol,
				int tcplen)
{
	struct in6_addr *saddr, *daddr;

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
	} else {
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
	}
	return tcp_v6_do_calc_md5_hash(md5_hash, key,
				       saddr, daddr,
				       th, protocol, tcplen);
}

static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
{
	__u8 *hash_location = NULL;
	struct tcp_md5sig_key *hash_expected;
	struct ipv6hdr *ip6h = skb->nh.ipv6h;
	struct tcphdr *th = skb->h.th;
	int length = (th->doff << 2) - sizeof (*th);
	int genhash;
	u8 *ptr;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);

	/* If the TCP option is too short, we can short cut */
	if (length < TCPOLEN_MD5SIG)
		return hash_expected ? 1 : 0;

	/* parse options */
	ptr = (u8*)(th + 1);
	while (length > 0) {
		int opcode = *ptr++;
		int opsize;

		switch(opcode) {
		case TCPOPT_EOL:
			goto done_opts;
		case TCPOPT_NOP:
			length--;
			continue;
		default:
			opsize = *ptr++;
			if (opsize < 2 || opsize > length)
				goto done_opts;
			if (opcode == TCPOPT_MD5SIG) {
				hash_location = ptr;
				goto done_opts;
			}
		}
		ptr += opsize - 2;
		length -= opsize;
	}

done_opts:
	/* do we have a hash as expected? */
	if (!hash_expected) {
		if (!hash_location)
			return 0;
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash NOT expected but found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	if (!hash_location) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash expected but NOT found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	/* check the signature */
	genhash = tcp_v6_do_calc_md5_hash(newhash,
					  hash_expected,
					  &ip6h->saddr, &ip6h->daddr,
					  th, sk->sk_protocol,
					  skb->len);
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash %s for "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       genhash ? "failed" : "mismatch",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}
	return 0;
}
#endif

static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
	.family		=	AF_INET6,
	.obj_size	=	sizeof(struct tcp6_request_sock),
	.rtx_syn_ack	=	tcp_v6_send_synack,
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
	.send_reset	=	tcp_v6_send_reset
};

#ifdef CONFIG_TCP_MD5SIG
static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
};
#endif

static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
	.twsk_destructor= tcp_twsk_destructor,
};

static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcphdr *th = skb->h.th;

	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
		skb->csum_offset = offsetof(struct tcphdr, check);
	} else {
		th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 
					    csum_partial((char *)th, th->doff<<2, 
							 skb->csum));
	}
}

static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
	struct ipv6hdr *ipv6h;
	struct tcphdr *th;

	if (!pskb_may_pull(skb, sizeof(*th)))
		return -EINVAL;

	ipv6h = skb->nh.ipv6h;
	th = skb->h.th;

	th->check = 0;
	th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
				     IPPROTO_TCP, 0);
	skb->csum_offset = offsetof(struct tcphdr, check);
	skb->ip_summed = CHECKSUM_PARTIAL;
	return 0;
}

static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
{
	struct tcphdr *th = skb->h.th, *t1; 
	struct sk_buff *buff;
	struct flowi fl;
	int tot_len = sizeof(*th);
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif

	if (th->rst)
		return;

	if (!ipv6_unicast_destination(skb))
		return; 

#ifdef CONFIG_TCP_MD5SIG
	if (sk)
		key = tcp_v6_md5_do_lookup(sk, &skb->nh.ipv6h->daddr);
	else
		key = NULL;

	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

	/*
	 * We need to grab some memory, and put together an RST,
	 * and then put it into the queue to be sent.
	 */

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
			 GFP_ATOMIC);
	if (buff == NULL) 
	  	return;

	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);

	t1 = (struct tcphdr *) skb_push(buff, tot_len);

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
	t1->doff = tot_len / 4;
	t1->rst = 1;
  
	if(th->ack) {
	  	t1->seq = th->ack_seq;
	} else {
		t1->ack = 1;
		t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
				    + skb->len - (th->doff<<2));
	}

#ifdef CONFIG_TCP_MD5SIG
	if (key) {
		__be32 *opt = (__be32*)(t1 + 1);
		opt[0] = htonl((TCPOPT_NOP << 24) |
			       (TCPOPT_NOP << 16) |
			       (TCPOPT_MD5SIG << 8) |
			       TCPOLEN_MD5SIG);
		tcp_v6_do_calc_md5_hash((__u8*)&opt[1],
					key,
					&skb->nh.ipv6h->daddr,
					&skb->nh.ipv6h->saddr,
					t1, IPPROTO_TCP,
					tot_len);
	}
#endif

	buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);

	memset(&fl, 0, sizeof(fl));
	ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
	ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr);

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    sizeof(*t1), IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
	fl.oif = inet6_iif(skb);
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
	security_skb_classify_flow(skb, &fl);

	/* sk = NULL, but it is safe for now. RST socket required. */
	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {

		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
			ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
			TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
			TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
			return;
		}
	}

	kfree_skb(buff);
}

static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
			    struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
{
	struct tcphdr *th = skb->h.th, *t1;
	struct sk_buff *buff;
	struct flowi fl;
	int tot_len = sizeof(struct tcphdr);
	__be32 *topt;
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
	struct tcp_md5sig_key tw_key;
#endif

#ifdef CONFIG_TCP_MD5SIG
	if (!tw && skb->sk) {
		key = tcp_v6_md5_do_lookup(skb->sk, &skb->nh.ipv6h->daddr);
	} else if (tw && tw->tw_md5_keylen) {
		tw_key.key = tw->tw_md5_key;
		tw_key.keylen = tw->tw_md5_keylen;
		key = &tw_key;
	} else {
		key = NULL;
	}
#endif

	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
			 GFP_ATOMIC);
	if (buff == NULL)
		return;

	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);

	t1 = (struct tcphdr *) skb_push(buff,tot_len);

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
	t1->doff = tot_len/4;
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = 1;
	t1->window = htons(win);

	topt = (__be32 *)(t1 + 1);
	
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt = htonl(ts);
	}

#ifdef CONFIG_TCP_MD5SIG
	if (key) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_do_calc_md5_hash((__u8 *)topt,
					key,
					&skb->nh.ipv6h->daddr,
					&skb->nh.ipv6h->saddr,
					t1, IPPROTO_TCP,
					tot_len);
	}
#endif

	buff->csum = csum_partial((char *)t1, tot_len, 0);

	memset(&fl, 0, sizeof(fl));
	ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
	ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr);

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    tot_len, IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
	fl.oif = inet6_iif(skb);
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
	security_skb_classify_flow(skb, &fl);

	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
			ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
			TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
			return;
		}
	}

	kfree_skb(buff);
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
	struct inet_timewait_sock *tw = inet_twsk(sk);
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);

	tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
			tcptw->tw_ts_recent);

	inet_twsk_put(tw);
}

static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
{
	tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
	struct request_sock *req, **prev;
	const struct tcphdr *th = skb->h.th;
	struct sock *nsk;

	/* Find possible connection requests. */
	req = inet6_csk_search_req(sk, &prev, th->source,
				   &skb->nh.ipv6h->saddr,
				   &skb->nh.ipv6h->daddr, inet6_iif(skb));
	if (req)
		return tcp_check_req(sk, skb, req, prev);

	nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr,
					 th->source, &skb->nh.ipv6h->daddr,
					 ntohs(th->dest), inet6_iif(skb));

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
		inet_twsk_put(inet_twsk(nsk));
		return NULL;
	}

#if 0 /*def CONFIG_SYN_COOKIES*/
	if (!th->rst && !th->syn && th->ack)
		sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
#endif
	return sk;
}

/* FIXME: this is substantially similar to the ipv4 code.
 * Can some kind of merge be done? -- erics
 */
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
	struct inet6_request_sock *treq;
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_options_received tmp_opt;
	struct tcp_sock *tp = tcp_sk(sk);
	struct request_sock *req = NULL;
	__u32 isn = TCP_SKB_CB(skb)->when;

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_conn_request(sk, skb);

	if (!ipv6_unicast_destination(skb))
		goto drop; 

	/*
	 *	There are no SYN attacks on IPv6, yet...	
	 */
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
		if (net_ratelimit())
			printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
		goto drop;		
	}

	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
		goto drop;

	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
	if (req == NULL)
		goto drop;

#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

	tcp_clear_options(&tmp_opt);
	tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
	tmp_opt.user_mss = tp->rx_opt.user_mss;

	tcp_parse_options(skb, &tmp_opt, 0);

	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

	treq = inet6_rsk(req);
	ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr);
	ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr);
	TCP_ECN_create_request(req, skb->h.th);
	treq->pktopts = NULL;
	if (ipv6_opt_accepted(sk, skb) ||
	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
	    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
		atomic_inc(&skb->users);
		treq->pktopts = skb;
	}
	treq->iif = sk->sk_bound_dev_if;

	/* So that link locals have meaning */
	if (!sk->sk_bound_dev_if &&
	    ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
		treq->iif = inet6_iif(skb);

	if (isn == 0) 
		isn = tcp_v6_init_sequence(skb);

	tcp_rsk(req)->snt_isn = isn;

	security_inet_conn_request(sk, skb, req);

	if (tcp_v6_send_synack(sk, req, NULL))
		goto drop;

	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;

drop:
	if (req)
		reqsk_free(req);

	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
					  struct request_sock *req,
					  struct dst_entry *dst)
{
	struct inet6_request_sock *treq = inet6_rsk(req);
	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
	struct tcp6_sock *newtcp6sk;
	struct inet_sock *newinet;
	struct tcp_sock *newtp;
	struct sock *newsk;
	struct ipv6_txoptions *opt;
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif

	if (skb->protocol == htons(ETH_P_IP)) {
		/*
		 *	v6 mapped
		 */

		newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);

		if (newsk == NULL) 
			return NULL;

		newtcp6sk = (struct tcp6_sock *)newsk;
		inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

		newinet = inet_sk(newsk);
		newnp = inet6_sk(newsk);
		newtp = tcp_sk(newsk);

		memcpy(newnp, np, sizeof(struct ipv6_pinfo));

		ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
			      newinet->daddr);

		ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
			      newinet->saddr);

		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);

		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
		newnp->mcast_oif   = inet6_iif(skb);
		newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;

		/*
		 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
		 * here, tcp_create_openreq_child now does this for us, see the comment in
		 * that function for the gory details. -acme
		 */

		/* It is tricky place. Until this moment IPv4 tcp
		   worked with IPv6 icsk.icsk_af_ops.
		   Sync it now.
		 */
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);

		return newsk;
	}

	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

	if (np->rxopt.bits.osrcrt == 2 &&
	    opt == NULL && treq->pktopts) {
		struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts);
		if (rxopt->srcrt)
			opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt));
	}

	if (dst == NULL) {
		struct in6_addr *final_p = NULL, final;
		struct flowi fl;

		memset(&fl, 0, sizeof(fl));
		fl.proto = IPPROTO_TCP;
		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
		if (opt && opt->srcrt) {
			struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
			ipv6_addr_copy(&final, &fl.fl6_dst);
			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
			final_p = &final;
		}
		ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
		fl.oif = sk->sk_bound_dev_if;
		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
		fl.fl_ip_sport = inet_sk(sk)->sport;
		security_req_classify_flow(req, &fl);

		if (ip6_dst_lookup(sk, &dst, &fl))
			goto out;

		if (final_p)
			ipv6_addr_copy(&fl.fl6_dst, final_p);

		if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto out;
	} 

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
		goto out;

	/*
	 * No need to charge this sock to the relevant IPv6 refcnt debug socks
	 * count here, tcp_create_openreq_child now does this for us, see the
	 * comment in that function for the gory details. -acme
	 */

	newsk->sk_gso_type = SKB_GSO_TCPV6;
	__ip6_dst_store(newsk, dst, NULL, NULL);

	newtcp6sk = (struct tcp6_sock *)newsk;
	inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

	newtp = tcp_sk(newsk);
	newinet = inet_sk(newsk);
	newnp = inet6_sk(newsk);

	memcpy(newnp, np, sizeof(struct ipv6_pinfo));

	ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
	ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
	ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
	newsk->sk_bound_dev_if = treq->iif;

	/* Now IPv6 options... 

	   First: no IPv4 options.
	 */
	newinet->opt = NULL;

	/* Clone RX bits */
	newnp->rxopt.all = np->rxopt.all;

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
	if (treq->pktopts != NULL) {
		newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
		kfree_skb(treq->pktopts);
		treq->pktopts = NULL;
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
	newnp->mcast_oif  = inet6_iif(skb);
	newnp->mcast_hops = skb->nh.ipv6h->hop_limit;

	/* Clone native IPv6 options from listening socket (if any)

	   Yes, keeping reference count would be much more clever,
	   but we make one more one thing there: reattach optmem
	   to newsk.
	 */
	if (opt) {
		newnp->opt = ipv6_dup_options(newsk, opt);
		if (opt != np->opt)
			sock_kfree_s(sk, opt, opt->tot_len);
	}

	inet_csk(newsk)->icsk_ext_hdr_len = 0;
	if (newnp->opt)
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);

	tcp_mtup_init(newsk);
	tcp_sync_mss(newsk, dst_mtu(dst));
	newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
	tcp_initialize_rcv_mss(newsk);

	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;

#ifdef CONFIG_TCP_MD5SIG
	/* Copy over the MD5 key from the original socket */
	if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
		/* We're using one, so create a matching key
		 * on the newsk structure. If we fail to get
		 * memory, then we end up not copying the key
		 * across. Shucks.
		 */
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
			tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
					  newkey, key->keylen);
	}
#endif

	__inet6_hash(&tcp_hashinfo, newsk);
	inet_inherit_port(&tcp_hashinfo, sk, newsk);

	return newsk;

out_overflow:
	NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
out:
	NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
	return NULL;
}

static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
		if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
				  &skb->nh.ipv6h->daddr,skb->csum)) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			return 0;
		}
	}

	skb->csum = ~csum_unfold(tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
				  &skb->nh.ipv6h->daddr, 0));

	if (skb->len <= 76) {
		return __skb_checksum_complete(skb);
	}
	return 0;
}

/* The socket must have it's spinlock held when we get
 * here.
 *
 * We have a potential double-lock case here, so even when
 * doing backlog processing we use the BH locking scheme.
 * This is because we cannot sleep with the original spinlock
 * held.
 */
static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp;
	struct sk_buff *opt_skb = NULL;

	/* Imagine: socket is IPv6. IPv4 packet arrives,
	   goes to IPv4 receive handler and backlogged.
	   From backlog it always goes here. Kerboom...
	   Fortunately, tcp_rcv_established and rcv_established
	   handle them correctly, but it is not case with
	   tcp_v6_hnd_req and tcp_v6_send_reset().   --ANK
	 */

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_do_rcv(sk, skb);

#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

	if (sk_filter(sk, skb))
		goto discard;

	/*
	 *	socket locking is here for SMP purposes as backlog rcv
	 *	is currently called with bh processing disabled.
	 */

	/* Do Stevens' IPV6_PKTOPTIONS.

	   Yes, guys, it is the only place in our code, where we
	   may make it not affecting IPv4.
	   The rest of code is protocol independent,
	   and I do not like idea to uglify IPv4.

	   Actually, all the idea behind IPV6_PKTOPTIONS
	   looks not very well thought. For now we latch
	   options, received in the last packet, enqueued
	   by tcp. Feel free to propose better solution.
	                                       --ANK (980728)
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
		TCP_CHECK_TIMER(sk);
		if (tcp_rcv_established(sk, skb, skb->h.th, skb->len))
			goto reset;
		TCP_CHECK_TIMER(sk);
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

	if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb))
		goto csum_err;

	if (sk->sk_state == TCP_LISTEN) { 
		struct sock *nsk = tcp_v6_hnd_req(sk, skb);
		if (!nsk)
			goto discard;

		/*
		 * Queue it on the new socket if the new socket is active,
		 * otherwise we just shortcircuit this and continue with
		 * the new socket..
		 */
 		if(nsk != sk) {
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
	}

	TCP_CHECK_TIMER(sk);
	if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len))
		goto reset;
	TCP_CHECK_TIMER(sk);
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
	tcp_v6_send_reset(sk, skb);
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
	TCP_INC_STATS_BH(TCP_MIB_INERRS);
	goto discard;


ipv6_pktoptions:
	/* Do you ask, what is it?

	   1. skb was enqueued by tcp.
	   2. skb is added to tail of read queue, rather than out of order.
	   3. socket is not in passive state.
	   4. Finally, it really contains options, which user wants to receive.
	 */
	tp = tcp_sk(sk);
	if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
			np->mcast_oif = inet6_iif(opt_skb);
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
			np->mcast_hops = opt_skb->nh.ipv6h->hop_limit;
		if (ipv6_opt_accepted(sk, opt_skb)) {
			skb_set_owner_r(opt_skb, sk);
			opt_skb = xchg(&np->pktoptions, opt_skb);
		} else {
			__kfree_skb(opt_skb);
			opt_skb = xchg(&np->pktoptions, NULL);
		}
	}

	if (opt_skb)
		kfree_skb(opt_skb);
	return 0;
}

static int tcp_v6_rcv(struct sk_buff **pskb)
{
	struct sk_buff *skb = *pskb;
	struct tcphdr *th;	
	struct sock *sk;
	int ret;

	if (skb->pkt_type != PACKET_HOST)
		goto discard_it;

	/*
	 *	Count it even if it's bad.
	 */
	TCP_INC_STATS_BH(TCP_MIB_INSEGS);

	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
		goto discard_it;

	th = skb->h.th;

	if (th->doff < sizeof(struct tcphdr)/4)
		goto bad_packet;
	if (!pskb_may_pull(skb, th->doff*4))
		goto discard_it;

	if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
	     tcp_v6_checksum_init(skb)))
		goto bad_packet;

	th = skb->h.th;
	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
				    skb->len - th->doff*4);
	TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
	TCP_SKB_CB(skb)->when = 0;
	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h);
	TCP_SKB_CB(skb)->sacked = 0;

	sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source,
			    &skb->nh.ipv6h->daddr, ntohs(th->dest),
			    inet6_iif(skb));

	if (!sk)
		goto no_tcp_socket;

process:
	if (sk->sk_state == TCP_TIME_WAIT)
		goto do_time_wait;

	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

	if (sk_filter(sk, skb))
		goto discard_and_relse;

	skb->dev = NULL;

	bh_lock_sock_nested(sk);
	ret = 0;
	if (!sock_owned_by_user(sk)) {
#ifdef CONFIG_NET_DMA
                struct tcp_sock *tp = tcp_sk(sk);
                if (tp->ucopy.dma_chan)
                        ret = tcp_v6_do_rcv(sk, skb);
                else
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
	} else
		sk_add_backlog(sk, skb);
	bh_unlock_sock(sk);

	sock_put(sk);
	return ret ? -1 : 0;

no_tcp_socket:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
		goto discard_it;

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {