X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fipv6%2Ftcp_ipv6.c;h=6963a6b6763e74f8aca6e95888bcd62793b89745;hb=d5aa407f59f5b83d2c50ec88f5bf56d40f1f8978;hp=12750f2b05ab02ff6846b64a1d880cfd9402322e;hpb=ab1e0a13d70299e792fd0527cefd070c1405fa5b;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 12750f2..6963a6b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -5,8 +5,6 @@
  *	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
@@ -25,6 +23,7 @@
  *      2 of the License, or (at your option) any later version.
  */
 
+#include <linux/bottom_half.h>
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/types.h>
@@ -60,6 +59,7 @@
 #include <net/dsfield.h>
 #include <net/timewait_sock.h>
 #include <net/netdma.h>
+#include <net/inet_common.h>
 
 #include <asm/uaccess.h>
 
@@ -69,21 +69,23 @@
 #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 void	tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
+				      struct request_sock *req);
 
 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;
+static const struct inet_connection_sock_af_ops ipv6_mapped;
+static const 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;
+static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
+static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
+#else
+static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
+						   struct in6_addr *addr)
+{
+	return NULL;
+}
 #endif
 
 static void tcp_v6_hash(struct sock *sk)
@@ -94,12 +96,12 @@ static void tcp_v6_hash(struct sock *sk)
 			return;
 		}
 		local_bh_disable();
-		__inet6_hash(sk);
+		__inet6_hash(sk, NULL);
 		local_bh_enable();
 	}
 }
 
-static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
+static __inline__ __sum16 tcp_v6_check(int len,
 				   struct in6_addr *saddr,
 				   struct in6_addr *daddr,
 				   __wsum base)
@@ -224,10 +226,9 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 #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);
+			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
+			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
+					       &np->rcv_saddr);
 		}
 
 		return err;
@@ -241,8 +242,9 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	ipv6_addr_copy(&fl.fl6_src,
 		       (saddr ? saddr : &np->saddr));
 	fl.oif = sk->sk_bound_dev_if;
+	fl.mark = sk->sk_mark;
 	fl.fl_ip_dport = usin->sin6_port;
-	fl.fl_ip_sport = inet->sport;
+	fl.fl_ip_sport = inet->inet_sport;
 
 	if (np->opt && np->opt->srcrt) {
 		struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
@@ -259,7 +261,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	if (final_p)
 		ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-	if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
+	err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
+	if (err < 0) {
 		if (err == -EREMOTE)
 			err = ip6_dst_blackhole(sk, &dst, &fl);
 		if (err < 0)
@@ -273,7 +276,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 
 	/* set the source address */
 	ipv6_addr_copy(&np->saddr, saddr);
-	inet->rcv_saddr = LOOPBACK4_IPV6;
+	inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 
 	sk->sk_gso_type = SKB_GSO_TCPV6;
 	__ip6_dst_store(sk, dst, NULL, NULL);
@@ -285,7 +288,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 
 	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
 
-	inet->dport = usin->sin6_port;
+	inet->inet_dport = usin->sin6_port;
 
 	tcp_set_state(sk, TCP_SYN_SENT);
 	err = inet6_hash_connect(&tcp_death_row, sk);
@@ -295,8 +298,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	if (!tp->write_seq)
 		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
 							     np->daddr.s6_addr32,
-							     inet->sport,
-							     inet->dport);
+							     inet->inet_sport,
+							     inet->inet_dport);
 
 	err = tcp_connect(sk);
 	if (err)
@@ -308,13 +311,13 @@ late_failure:
 	tcp_set_state(sk, TCP_CLOSE);
 	__sk_dst_reset(sk);
 failure:
-	inet->dport = 0;
+	inet->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)
+		u8 type, u8 code, int offset, __be32 info)
 {
 	struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
 	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
@@ -323,12 +326,14 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	int err;
 	struct tcp_sock *tp;
 	__u32 seq;
+	struct net *net = dev_net(skb->dev);
 
-	sk = inet6_lookup(skb->dev->nd_net, &tcp_hashinfo, &hdr->daddr,
+	sk = inet6_lookup(net, &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);
+		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
+				   ICMP6_MIB_INERRORS);
 		return;
 	}
 
@@ -339,7 +344,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk))
-		NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
+		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 
 	if (sk->sk_state == TCP_CLOSE)
 		goto out;
@@ -348,7 +353,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	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);
+		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 		goto out;
 	}
 
@@ -378,8 +383,9 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 			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;
+			fl.mark = sk->sk_mark;
+			fl.fl_ip_dport = inet->inet_dport;
+			fl.fl_ip_sport = inet->inet_sport;
 			security_skb_classify_flow(skb, &fl);
 
 			if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
@@ -387,7 +393,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 				goto out;
 			}
 
-			if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
+			if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) {
 				sk->sk_err_soft = -err;
 				goto out;
 			}
@@ -420,10 +426,10 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		/* ICMPs are not backlogged, hence we cannot get
 		 * an established socket here.
 		 */
-		BUG_TRAP(req->sk == NULL);
+		WARN_ON(req->sk != NULL);
 
 		if (seq != tcp_rsk(req)->snt_isn) {
-			NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
+			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 			goto out;
 		}
 
@@ -456,7 +462,7 @@ out:
 
 
 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
-			      struct dst_entry *dst)
+			      struct request_values *rvp)
 {
 	struct inet6_request_sock *treq = inet6_rsk(req);
 	struct ipv6_pinfo *np = inet6_sk(sk);
@@ -464,6 +470,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 	struct ipv6_txoptions *opt = NULL;
 	struct in6_addr * final_p = NULL, final;
 	struct flowi fl;
+	struct dst_entry *dst;
 	int err = -1;
 
 	memset(&fl, 0, sizeof(fl));
@@ -472,35 +479,34 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 	ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
 	fl.fl6_flowlabel = 0;
 	fl.oif = treq->iif;
+	fl.mark = sk->sk_mark;
 	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
-	fl.fl_ip_sport = inet_sk(sk)->sport;
+	fl.fl_ip_sport = inet_rsk(req)->loc_port;
 	security_req_classify_flow(req, &fl);
 
-	if (dst == NULL) {
-		opt = np->opt;
-		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;
+	opt = np->opt;
+	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;
 	}
 
-	skb = tcp_make_synack(sk, dst, req);
+	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(sock_net(sk), &dst, &fl, sk, 0)) < 0)
+		goto done;
+
+	skb = tcp_make_synack(sk, dst, req, rvp);
 	if (skb) {
 		struct tcphdr *th = tcp_hdr(skb);
 
-		th->check = tcp_v6_check(th, skb->len,
+		th->check = tcp_v6_check(skb->len,
 					 &treq->loc_addr, &treq->rmt_addr,
-					 csum_partial((char *)th, skb->len, skb->csum));
+					 csum_partial(th, skb->len, skb->csum));
 
 		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
 		err = ip6_xmit(sk, skb, &fl, opt, 0);
@@ -514,10 +520,30 @@ done:
 	return err;
 }
 
+static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
+			     struct request_values *rvp)
+{
+	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
+	return tcp_v6_send_synack(sk, req, rvp);
+}
+
+static inline void syn_flood_warning(struct sk_buff *skb)
+{
+#ifdef CONFIG_SYN_COOKIES
+	if (sysctl_tcp_syncookies)
+		printk(KERN_INFO
+		       "TCPv6: Possible SYN flooding on port %d. "
+		       "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
+	else
+#endif
+		printk(KERN_INFO
+		       "TCPv6: Possible SYN flooding on port %d. "
+		       "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
+}
+
 static void tcp_v6_reqsk_destructor(struct request_sock *req)
 {
-	if (inet6_rsk(req)->pktopts)
-		kfree_skb(inet6_rsk(req)->pktopts);
+	kfree_skb(inet6_rsk(req)->pktopts);
 }
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -533,7 +559,7 @@ static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
 		return NULL;
 
 	for (i = 0; i < tp->md5sig_info->entries6; i++) {
-		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
+		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
 			return &tp->md5sig_info->keys6[i].base;
 	}
 	return NULL;
@@ -575,7 +601,7 @@ static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
 			}
 			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
 		}
-		if (tcp_alloc_md5sig_pool() == NULL) {
+		if (tcp_alloc_md5sig_pool(sk) == NULL) {
 			kfree(newkey);
 			return -ENOMEM;
 		}
@@ -622,7 +648,7 @@ static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
 	int i;
 
 	for (i = 0; i < tp->md5sig_info->entries6; i++) {
-		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
+		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
 			/* Free the key */
 			kfree(tp->md5sig_info->keys6[i].base.key);
 			tp->md5sig_info->entries6--;
@@ -723,109 +749,105 @@ static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
 	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,
-				   unsigned int tcplen)
+static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
+					struct in6_addr *daddr,
+					struct in6_addr *saddr, int nbytes)
 {
-	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;
+	struct scatterlist sg;
 
-	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);
+	bp->protocol = cpu_to_be32(IPPROTO_TCP);
+	bp->len = cpu_to_be32(nbytes);
 
-	sg_init_table(sg, 4);
-
-	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;
-	}
+	sg_init_one(&sg, bp, sizeof(*bp));
+	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
+}
 
-	/* 4. shared key */
-	sg_set_buf(&sg[block++], key->key, key->keylen);
-	nbytes += key->keylen;
+static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
+			       struct in6_addr *daddr, struct in6_addr *saddr,
+			       struct tcphdr *th)
+{
+	struct tcp_md5sig_pool *hp;
+	struct hash_desc *desc;
 
-	sg_mark_end(&sg[block - 1]);
+	hp = tcp_get_md5sig_pool();
+	if (!hp)
+		goto clear_hash_noput;
+	desc = &hp->md5_desc;
 
-	/* Now store the hash into the packet */
-	err = crypto_hash_init(desc);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
+	if (crypto_hash_init(desc))
 		goto clear_hash;
-	}
-	err = crypto_hash_update(desc, sg, nbytes);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
+	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
 		goto clear_hash;
-	}
-	err = crypto_hash_final(desc, md5_hash);
-	if (err) {
-		printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
+	if (tcp_md5_hash_header(hp, th))
+		goto clear_hash;
+	if (tcp_md5_hash_key(hp, key))
+		goto clear_hash;
+	if (crypto_hash_final(desc, md5_hash))
 		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;
+	return 1;
 }
 
-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,
-				unsigned int tcplen)
+static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
+			       struct sock *sk, struct request_sock *req,
+			       struct sk_buff *skb)
 {
 	struct in6_addr *saddr, *daddr;
+	struct tcp_md5sig_pool *hp;
+	struct hash_desc *desc;
+	struct tcphdr *th = tcp_hdr(skb);
 
 	if (sk) {
 		saddr = &inet6_sk(sk)->saddr;
 		daddr = &inet6_sk(sk)->daddr;
-	} else {
+	} else if (req) {
 		saddr = &inet6_rsk(req)->loc_addr;
 		daddr = &inet6_rsk(req)->rmt_addr;
+	} else {
+		struct ipv6hdr *ip6h = ipv6_hdr(skb);
+		saddr = &ip6h->saddr;
+		daddr = &ip6h->daddr;
 	}
-	return tcp_v6_do_calc_md5_hash(md5_hash, key,
-				       saddr, daddr,
-				       th, protocol, tcplen);
+
+	hp = tcp_get_md5sig_pool();
+	if (!hp)
+		goto clear_hash_noput;
+	desc = &hp->md5_desc;
+
+	if (crypto_hash_init(desc))
+		goto clear_hash;
+
+	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
+		goto clear_hash;
+	if (tcp_md5_hash_header(hp, th))
+		goto clear_hash;
+	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+		goto clear_hash;
+	if (tcp_md5_hash_key(hp, key))
+		goto clear_hash;
+	if (crypto_hash_final(desc, md5_hash))
+		goto clear_hash;
+
+	tcp_put_md5sig_pool();
+	return 0;
+
+clear_hash:
+	tcp_put_md5sig_pool();
+clear_hash_noput:
+	memset(md5_hash, 0, 16);
+	return 1;
 }
 
 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
@@ -834,82 +856,37 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
 	struct tcp_md5sig_key *hash_expected;
 	struct ipv6hdr *ip6h = ipv6_hdr(skb);
 	struct tcphdr *th = tcp_hdr(skb);
-	int length = (th->doff << 2) - sizeof (*th);
 	int genhash;
-	u8 *ptr;
 	u8 newhash[16];
 
 	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
+	hash_location = tcp_parse_md5sig_option(th);
 
-	/* 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;
-	}
+	/* We've parsed the options - do we have a hash? */
+	if (!hash_expected && !hash_location)
+		return 0;
 
-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));
-		}
+	if (hash_expected && !hash_location) {
+		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
 		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));
-		}
+	if (!hash_expected && hash_location) {
+		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
 		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);
+	genhash = tcp_v6_md5_hash_skb(newhash,
+				      hash_expected,
+				      NULL, NULL, skb);
+
 	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",
+			printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
 			       genhash ? "failed" : "mismatch",
-			       NIP6(ip6h->saddr), ntohs(th->source),
-			       NIP6(ip6h->daddr), ntohs(th->dest));
+			       &ip6h->saddr, ntohs(th->source),
+			       &ip6h->daddr, ntohs(th->dest));
 		}
 		return 1;
 	}
@@ -917,18 +894,20 @@ done_opts:
 }
 #endif
 
-static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
+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,
+	.rtx_syn_ack	=	tcp_v6_rtx_synack,
 	.send_ack	=	tcp_v6_reqsk_send_ack,
 	.destructor	=	tcp_v6_reqsk_destructor,
-	.send_reset	=	tcp_v6_send_reset
+	.send_reset	=	tcp_v6_send_reset,
+	.syn_ack_timeout = 	tcp_syn_ack_timeout,
 };
 
 #ifdef CONFIG_TCP_MD5SIG
-static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
+static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
 	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
+	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
 };
 #endif
 
@@ -949,7 +928,7 @@ static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 		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,
+					    csum_partial(th, th->doff<<2,
 							 skb->csum));
 	}
 }
@@ -974,129 +953,51 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
 	return 0;
 }
 
-static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
+static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
+					 struct sk_buff *skb)
 {
-	struct tcphdr *th = tcp_hdr(skb), *t1;
-	struct sk_buff *buff;
-	struct flowi fl;
-	unsigned 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, &ipv6_hdr(skb)->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;
+	struct ipv6hdr *iph = skb_gro_network_header(skb);
 
-	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));
-	}
+	switch (skb->ip_summed) {
+	case CHECKSUM_COMPLETE:
+		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
+				  skb->csum)) {
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+			break;
+		}
 
-#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,
-					&ipv6_hdr(skb)->daddr,
-					&ipv6_hdr(skb)->saddr,
-					t1, IPPROTO_TCP, tot_len);
+		/* fall through */
+	case CHECKSUM_NONE:
+		NAPI_GRO_CB(skb)->flush = 1;
+		return NULL;
 	}
-#endif
-
-	buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
-
-	memset(&fl, 0, sizeof(fl));
-	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
-	ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->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);
+	return tcp_gro_receive(head, skb);
+}
 
-	/* sk = NULL, but it is safe for now. RST socket required. */
-	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
+static int tcp6_gro_complete(struct sk_buff *skb)
+{
+	struct ipv6hdr *iph = ipv6_hdr(skb);
+	struct tcphdr *th = tcp_hdr(skb);
 
-		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;
-		}
-	}
+	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
+				  &iph->saddr, &iph->daddr, 0);
+	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
 
-	kfree_skb(buff);
+	return tcp_gro_complete(skb);
 }
 
-static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
-			    struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
+static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
+				 u32 ts, struct tcp_md5sig_key *key, int rst)
 {
 	struct tcphdr *th = tcp_hdr(skb), *t1;
 	struct sk_buff *buff;
 	struct flowi fl;
+	struct net *net = dev_net(skb_dst(skb)->dev);
+	struct sock *ctl_sk = net->ipv6.tcp_sk;
 	unsigned int tot_len = sizeof(struct tcphdr);
+	struct dst_entry *dst;
 	__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, &ipv6_hdr(skb)->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;
@@ -1112,16 +1013,18 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 
 	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
 
-	t1 = (struct tcphdr *) skb_push(buff,tot_len);
+	t1 = (struct tcphdr *) skb_push(buff, tot_len);
+	skb_reset_transport_header(skb);
 
 	/* 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->doff = tot_len / 4;
 	t1->seq = htonl(seq);
 	t1->ack_seq = htonl(ack);
-	t1->ack = 1;
+	t1->ack = !rst || !th->ack;
+	t1->rst = rst;
 	t1->window = htons(win);
 
 	topt = (__be32 *)(t1 + 1);
@@ -1130,21 +1033,20 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
 				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
 		*topt++ = htonl(tcp_time_stamp);
-		*topt = htonl(ts);
+		*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,
-					&ipv6_hdr(skb)->daddr,
-					&ipv6_hdr(skb)->saddr,
-					t1, IPPROTO_TCP, tot_len);
+		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
+				    &ipv6_hdr(skb)->saddr,
+				    &ipv6_hdr(skb)->daddr, t1);
 	}
 #endif
 
-	buff->csum = csum_partial((char *)t1, tot_len, 0);
+	buff->csum = csum_partial(t1, tot_len, 0);
 
 	memset(&fl, 0, sizeof(fl));
 	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
@@ -1160,10 +1062,17 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 	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);
+	/* Pass a socket to ip6_dst_lookup either it is for RST
+	 * Underlying function will use this to retrieve the network
+	 * namespace
+	 */
+	if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
+		if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
+			skb_dst_set(buff, dst);
+			ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
+			TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
+			if (rst)
+				TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
 			return;
 		}
 	}
@@ -1171,21 +1080,55 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 	kfree_skb(buff);
 }
 
+static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
+{
+	struct tcphdr *th = tcp_hdr(skb);
+	u32 seq = 0, ack_seq = 0;
+	struct tcp_md5sig_key *key = NULL;
+
+	if (th->rst)
+		return;
+
+	if (!ipv6_unicast_destination(skb))
+		return;
+
+#ifdef CONFIG_TCP_MD5SIG
+	if (sk)
+		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
+#endif
+
+	if (th->ack)
+		seq = ntohl(th->ack_seq);
+	else
+		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
+			  (th->doff << 2);
+
+	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
+}
+
+static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
+			    struct tcp_md5sig_key *key)
+{
+	tcp_v6_send_response(skb, seq, ack, win, ts, key, 0);
+}
+
 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,
+	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
-			tcptw->tw_ts_recent);
+			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
 
 	inet_twsk_put(tw);
 }
 
-static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
+static void tcp_v6_reqsk_send_ack(struct sock *sk, 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);
+	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
+			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
 }
 
 
@@ -1202,7 +1145,7 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 	if (req)
 		return tcp_check_req(sk, skb, req, prev);
 
-	nsk = __inet6_lookup_established(sk->sk_net, &tcp_hashinfo,
+	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
 			&ipv6_hdr(skb)->saddr, th->source,
 			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
 
@@ -1215,9 +1158,9 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 		return NULL;
 	}
 
-#if 0 /*def CONFIG_SYN_COOKIES*/
+#ifdef CONFIG_SYN_COOKIES
 	if (!th->rst && !th->syn && th->ack)
-		sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
+		sk = cookie_v6_check(sk, skb);
 #endif
 	return sk;
 }
@@ -1227,12 +1170,19 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
  */
 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
+	struct tcp_extend_values tmp_ext;
+	struct tcp_options_received tmp_opt;
+	u8 *hash_location;
+	struct request_sock *req;
 	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;
+#ifdef CONFIG_SYN_COOKIES
+	int want_cookie = 0;
+#else
+#define want_cookie 0
+#endif
 
 	if (skb->protocol == htons(ETH_P_IP))
 		return tcp_v4_conn_request(sk, skb);
@@ -1240,12 +1190,14 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *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");
+			syn_flood_warning(skb);
+#ifdef CONFIG_SYN_COOKIES
+		if (sysctl_tcp_syncookies)
+			want_cookie = 1;
+		else
+#endif
 		goto drop;
 	}
 
@@ -1263,8 +1215,55 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	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, &hash_location, 0);
+
+	if (tmp_opt.cookie_plus > 0 &&
+	    tmp_opt.saw_tstamp &&
+	    !tp->rx_opt.cookie_out_never &&
+	    (sysctl_tcp_cookie_size > 0 ||
+	     (tp->cookie_values != NULL &&
+	      tp->cookie_values->cookie_desired > 0))) {
+		u8 *c;
+		u32 *d;
+		u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
+		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;
+
+		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
+			goto drop_and_free;
+
+		/* Secret recipe starts with IP addresses */
+		d = &ipv6_hdr(skb)->daddr.s6_addr32[0];
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+		d = &ipv6_hdr(skb)->saddr.s6_addr32[0];
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+		*mess++ ^= *d++;
+
+		/* plus variable length Initiator Cookie */
+		c = (u8 *)mess;
+		while (l-- > 0)
+			*c++ ^= *hash_location++;
+
+#ifdef CONFIG_SYN_COOKIES
+		want_cookie = 0;	/* not our kind of cookie */
+#endif
+		tmp_ext.cookie_out_never = 0; /* false */
+		tmp_ext.cookie_plus = tmp_opt.cookie_plus;
+	} else if (!tp->rx_opt.cookie_in_always) {
+		/* redundant indications, but ensure initialization. */
+		tmp_ext.cookie_out_never = 1; /* true */
+		tmp_ext.cookie_plus = 0;
+	} else {
+		goto drop_and_free;
+	}
+	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
 
-	tcp_parse_options(skb, &tmp_opt, 0);
+	if (want_cookie && !tmp_opt.saw_tstamp)
+		tcp_clear_options(&tmp_opt);
 
 	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
 	tcp_openreq_init(req, &tmp_opt, skb);
@@ -1272,38 +1271,43 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	treq = inet6_rsk(req);
 	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
 	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
-	TCP_ECN_create_request(req, tcp_hdr(skb));
-	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;
+	if (!want_cookie)
+		TCP_ECN_create_request(req, tcp_hdr(skb));
+
+	if (want_cookie) {
+		isn = cookie_v6_init_sequence(sk, skb, &req->mss);
+		req->cookie_ts = tmp_opt.tstamp_ok;
+	} else if (!isn) {
+		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);
+		/* 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;
+	if (tcp_v6_send_synack(sk, req,
+			       (struct request_values *)&tmp_ext) ||
+	    want_cookie)
+		goto drop_and_free;
 
 	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
 	return 0;
 
+drop_and_free:
+	reqsk_free(req);
 drop:
-	if (req)
-		reqsk_free(req);
-
 	return 0; /* don't send reset */
 }
 
@@ -1311,7 +1315,7 @@ 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 inet6_request_sock *treq;
 	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 	struct tcp6_sock *newtcp6sk;
 	struct inet_sock *newinet;
@@ -1341,11 +1345,9 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 
 		memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 
-		ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
-			      newinet->daddr);
+		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
 
-		ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
-			      newinet->saddr);
+		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 
 		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 
@@ -1375,6 +1377,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		return newsk;
 	}
 
+	treq = inet6_rsk(req);
 	opt = np->opt;
 
 	if (sk_acceptq_is_full(sk))
@@ -1395,8 +1398,9 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		}
 		ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
 		fl.oif = sk->sk_bound_dev_if;
+		fl.mark = sk->sk_mark;
 		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
-		fl.fl_ip_sport = inet_sk(sk)->sport;
+		fl.fl_ip_sport = inet_rsk(req)->loc_port;
 		security_req_classify_flow(req, &fl);
 
 		if (ip6_dst_lookup(sk, &dst, &fl))
@@ -1405,7 +1409,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		if (final_p)
 			ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-		if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+		if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
 			goto out;
 	}
 
@@ -1481,7 +1485,8 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
 	tcp_initialize_rcv_mss(newsk);
 
-	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
+	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
+	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 
 #ifdef CONFIG_TCP_MD5SIG
 	/* Copy over the MD5 key from the original socket */
@@ -1493,20 +1498,20 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		 */
 		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
 		if (newkey != NULL)
-			tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
+			tcp_v6_md5_do_add(newsk, &newnp->daddr,
 					  newkey, key->keylen);
 	}
 #endif
 
-	__inet6_hash(newsk);
-	inet_inherit_port(sk, newsk);
+	__inet6_hash(newsk, NULL);
+	__inet_inherit_port(sk, newsk);
 
 	return newsk;
 
 out_overflow:
-	NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 out:
-	NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 	if (opt && opt != np->opt)
 		sock_kfree_s(sk, opt, opt->tot_len);
 	dst_release(dst);
@@ -1516,14 +1521,14 @@ out:
 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
 {
 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
-		if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
+		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
 				  &ipv6_hdr(skb)->daddr, skb->csum)) {
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 			return 0;
 		}
 	}
 
-	skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
+	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
 					      &ipv6_hdr(skb)->saddr,
 					      &ipv6_hdr(skb)->daddr, 0));
 
@@ -1635,7 +1640,7 @@ discard:
 	kfree_skb(skb);
 	return 0;
 csum_err:
-	TCP_INC_STATS_BH(TCP_MIB_INERRS);
+	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
 	goto discard;
 
 
@@ -1663,8 +1668,7 @@ ipv6_pktoptions:
 		}
 	}
 
-	if (opt_skb)
-		kfree_skb(opt_skb);
+	kfree_skb(opt_skb);
 	return 0;
 }
 
@@ -1673,6 +1677,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
 	struct tcphdr *th;
 	struct sock *sk;
 	int ret;
+	struct net *net = dev_net(skb->dev);
 
 	if (skb->pkt_type != PACKET_HOST)
 		goto discard_it;
@@ -1680,7 +1685,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
 	/*
 	 *	Count it even if it's bad.
 	 */
-	TCP_INC_STATS_BH(TCP_MIB_INSEGS);
+	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
 
 	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
 		goto discard_it;
@@ -1704,11 +1709,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
 	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
 	TCP_SKB_CB(skb)->sacked = 0;
 
-	sk = __inet6_lookup(skb->dev->nd_net, &tcp_hashinfo,
-			&ipv6_hdr(skb)->saddr, th->source,
-			&ipv6_hdr(skb)->daddr, ntohs(th->dest),
-			inet6_iif(skb));
-
+	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
 	if (!sk)
 		goto no_tcp_socket;
 
@@ -1730,7 +1731,7 @@ process:
 #ifdef CONFIG_NET_DMA
 		struct tcp_sock *tp = tcp_sk(sk);
 		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-			tp->ucopy.dma_chan = get_softnet_dma();
+			tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
 		if (tp->ucopy.dma_chan)
 			ret = tcp_v6_do_rcv(sk, skb);
 		else
@@ -1752,7 +1753,7 @@ no_tcp_socket:
 
 	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
 bad_packet:
-		TCP_INC_STATS_BH(TCP_MIB_INERRS);
+		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
 	} else {
 		tcp_v6_send_reset(NULL, skb);
 	}
@@ -1777,7 +1778,7 @@ do_time_wait:
 	}
 
 	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
-		TCP_INC_STATS_BH(TCP_MIB_INERRS);
+		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
 		inet_twsk_put(inet_twsk(sk));
 		goto discard_it;
 	}
@@ -1787,7 +1788,7 @@ do_time_wait:
 	{
 		struct sock *sk2;
 
-		sk2 = inet6_lookup_listener(skb->dev->nd_net, &tcp_hashinfo,
+		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
 					    &ipv6_hdr(skb)->daddr,
 					    ntohs(th->dest), inet6_iif(skb));
 		if (sk2 != NULL) {
@@ -1815,7 +1816,7 @@ static int tcp_v6_remember_stamp(struct sock *sk)
 	return 0;
 }
 
-static struct inet_connection_sock_af_ops ipv6_specific = {
+static const struct inet_connection_sock_af_ops ipv6_specific = {
 	.queue_xmit	   = inet6_csk_xmit,
 	.send_check	   = tcp_v6_send_check,
 	.rebuild_header	   = inet6_sk_rebuild_header,
@@ -1835,9 +1836,9 @@ static struct inet_connection_sock_af_ops ipv6_specific = {
 };
 
 #ifdef CONFIG_TCP_MD5SIG
-static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
+static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
 	.md5_lookup	=	tcp_v6_md5_lookup,
-	.calc_md5_hash	=	tcp_v6_calc_md5_hash,
+	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
 	.md5_add	=	tcp_v6_md5_add_func,
 	.md5_parse	=	tcp_v6_parse_md5_keys,
 };
@@ -1847,7 +1848,7 @@ static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
  *	TCP over IPv4 via INET6 API
  */
 
-static struct inet_connection_sock_af_ops ipv6_mapped = {
+static const struct inet_connection_sock_af_ops ipv6_mapped = {
 	.queue_xmit	   = ip_queue_xmit,
 	.send_check	   = tcp_v4_send_check,
 	.rebuild_header	   = inet_sk_rebuild_header,
@@ -1867,9 +1868,9 @@ static struct inet_connection_sock_af_ops ipv6_mapped = {
 };
 
 #ifdef CONFIG_TCP_MD5SIG
-static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
+static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
 	.md5_lookup	=	tcp_v4_md5_lookup,
-	.calc_md5_hash	=	tcp_v4_calc_md5_hash,
+	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
 	.md5_add	=	tcp_v6_md5_add_func,
 	.md5_parse	=	tcp_v6_parse_md5_keys,
 };
@@ -1900,9 +1901,9 @@ static int tcp_v6_init_sock(struct sock *sk)
 	/* See draft-stevens-tcpca-spec-01 for discussion of the
 	 * initialization of these values.
 	 */
-	tp->snd_ssthresh = 0x7fffffff;
+	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	tp->snd_cwnd_clamp = ~0;
-	tp->mss_cache = 536;
+	tp->mss_cache = TCP_MSS_DEFAULT;
 
 	tp->reordering = sysctl_tcp_reordering;
 
@@ -1918,15 +1919,30 @@ static int tcp_v6_init_sock(struct sock *sk)
 	tp->af_specific = &tcp_sock_ipv6_specific;
 #endif
 
+	/* TCP Cookie Transactions */
+	if (sysctl_tcp_cookie_size > 0) {
+		/* Default, cookies without s_data_payload. */
+		tp->cookie_values =
+			kzalloc(sizeof(*tp->cookie_values),
+				sk->sk_allocation);
+		if (tp->cookie_values != NULL)
+			kref_init(&tp->cookie_values->kref);
+	}
+	/* Presumed zeroed, in order of appearance:
+	 *	cookie_in_always, cookie_out_never,
+	 *	s_data_constant, s_data_in, s_data_out
+	 */
 	sk->sk_sndbuf = sysctl_tcp_wmem[1];
 	sk->sk_rcvbuf = sysctl_tcp_rmem[1];
 
-	atomic_inc(&tcp_sockets_allocated);
+	local_bh_disable();
+	percpu_counter_inc(&tcp_sockets_allocated);
+	local_bh_enable();
 
 	return 0;
 }
 
-static int tcp_v6_destroy_sock(struct sock *sk)
+static void tcp_v6_destroy_sock(struct sock *sk)
 {
 #ifdef CONFIG_TCP_MD5SIG
 	/* Clean up the MD5 key list */
@@ -1934,7 +1950,7 @@ static int tcp_v6_destroy_sock(struct sock *sk)
 		tcp_v6_clear_md5_list(sk);
 #endif
 	tcp_v4_destroy_sock(sk);
-	return inet6_destroy_sock(sk);
+	inet6_destroy_sock(sk);
 }
 
 #ifdef CONFIG_PROC_FS
@@ -1955,7 +1971,7 @@ static void get_openreq6(struct seq_file *seq,
 		   i,
 		   src->s6_addr32[0], src->s6_addr32[1],
 		   src->s6_addr32[2], src->s6_addr32[3],
-		   ntohs(inet_sk(sk)->sport),
+		   ntohs(inet_rsk(req)->loc_port),
 		   dest->s6_addr32[0], dest->s6_addr32[1],
 		   dest->s6_addr32[2], dest->s6_addr32[3],
 		   ntohs(inet_rsk(req)->rmt_port),
@@ -1983,8 +1999,8 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
 
 	dest  = &np->daddr;
 	src   = &np->rcv_saddr;
-	destp = ntohs(inet->dport);
-	srcp  = ntohs(inet->sport);
+	destp = ntohs(inet->inet_dport);
+	srcp  = ntohs(inet->inet_sport);
 
 	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 		timer_active	= 1;
@@ -2002,7 +2018,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
 
 	seq_printf(seq,
 		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
-		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
+		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
 		   i,
 		   src->s6_addr32[0], src->s6_addr32[1],
 		   src->s6_addr32[2], src->s6_addr32[3], srcp,
@@ -2018,10 +2034,11 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
 		   icsk->icsk_probes_out,
 		   sock_i_ino(sp),
 		   atomic_read(&sp->sk_refcnt), sp,
-		   icsk->icsk_rto,
-		   icsk->icsk_ack.ato,
+		   jiffies_to_clock_t(icsk->icsk_rto),
+		   jiffies_to_clock_t(icsk->icsk_ack.ato),
 		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
-		   tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
+		   tp->snd_cwnd,
+		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
 		   );
 }
 
@@ -2085,28 +2102,28 @@ out:
 	return 0;
 }
 
-static struct file_operations tcp6_seq_fops;
 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
-	.owner		= THIS_MODULE,
 	.name		= "tcp6",
 	.family		= AF_INET6,
-	.seq_show	= tcp6_seq_show,
-	.seq_fops	= &tcp6_seq_fops,
+	.seq_fops	= {
+		.owner		= THIS_MODULE,
+	},
+	.seq_ops	= {
+		.show		= tcp6_seq_show,
+	},
 };
 
-int __init tcp6_proc_init(void)
+int __net_init tcp6_proc_init(struct net *net)
 {
-	return tcp_proc_register(&tcp6_seq_afinfo);
+	return tcp_proc_register(net, &tcp6_seq_afinfo);
 }
 
-void tcp6_proc_exit(void)
+void tcp6_proc_exit(struct net *net)
 {
-	tcp_proc_unregister(&tcp6_seq_afinfo);
+	tcp_proc_unregister(net, &tcp6_seq_afinfo);
 }
 #endif
 
-DEFINE_PROTO_INUSE(tcpv6)
-
 struct proto tcpv6_prot = {
 	.name			= "TCPv6",
 	.owner			= THIS_MODULE,
@@ -2135,21 +2152,23 @@ struct proto tcpv6_prot = {
 	.sysctl_rmem		= sysctl_tcp_rmem,
 	.max_header		= MAX_TCP_HEADER,
 	.obj_size		= sizeof(struct tcp6_sock),
+	.slab_flags		= SLAB_DESTROY_BY_RCU,
 	.twsk_prot		= &tcp6_timewait_sock_ops,
 	.rsk_prot		= &tcp6_request_sock_ops,
-	.hashinfo		= &tcp_hashinfo,
+	.h.hashinfo		= &tcp_hashinfo,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt	= compat_tcp_setsockopt,
 	.compat_getsockopt	= compat_tcp_getsockopt,
 #endif
-	REF_PROTO_INUSE(tcpv6)
 };
 
-static struct inet6_protocol tcpv6_protocol = {
+static const struct inet6_protocol tcpv6_protocol = {
 	.handler	=	tcp_v6_rcv,
 	.err_handler	=	tcp_v6_err,
 	.gso_send_check	=	tcp_v6_gso_send_check,
 	.gso_segment	=	tcp_tso_segment,
+	.gro_receive	=	tcp6_gro_receive,
+	.gro_complete	=	tcp6_gro_complete,
 	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 };
 
@@ -2158,12 +2177,33 @@ static struct inet_protosw tcpv6_protosw = {
 	.protocol	=	IPPROTO_TCP,
 	.prot		=	&tcpv6_prot,
 	.ops		=	&inet6_stream_ops,
-	.capability	=	-1,
 	.no_check	=	0,
 	.flags		=	INET_PROTOSW_PERMANENT |
 				INET_PROTOSW_ICSK,
 };
 
+static int __net_init tcpv6_net_init(struct net *net)
+{
+	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
+				    SOCK_RAW, IPPROTO_TCP, net);
+}
+
+static void __net_exit tcpv6_net_exit(struct net *net)
+{
+	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
+}
+
+static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
+{
+	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
+}
+
+static struct pernet_operations tcpv6_net_ops = {
+	.init	    = tcpv6_net_init,
+	.exit	    = tcpv6_net_exit,
+	.exit_batch = tcpv6_net_exit_batch,
+};
+
 int __init tcpv6_init(void)
 {
 	int ret;
@@ -2177,8 +2217,7 @@ int __init tcpv6_init(void)
 	if (ret)
 		goto out_tcpv6_protocol;
 
-	ret = inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6,
-				       SOCK_RAW, IPPROTO_TCP);
+	ret = register_pernet_subsys(&tcpv6_net_ops);
 	if (ret)
 		goto out_tcpv6_protosw;
 out:
@@ -2193,7 +2232,7 @@ out_tcpv6_protosw:
 
 void tcpv6_exit(void)
 {
-	sock_release(tcp6_socket);
+	unregister_pernet_subsys(&tcpv6_net_ops);
 	inet6_unregister_protosw(&tcpv6_protosw);
 	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
 }