Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1745 commits) dp83640: free packet queues on remove dp83640: use proper function to free transmit time stamping packets ipv6: Do not use routes from locally generated RAs |PATCH net-next] tg3: add tx_dropped counter be2net: don't create multiple RX/TX rings in multi channel mode be2net: don't create multiple TXQs in BE2 be2net: refactor VF setup/teardown code into be_vf_setup/clear() be2net: add vlan/rx-mode/flow-control config to be_setup() net_sched: cls_flow: use skb_header_pointer() ipv4: avoid useless call of the function check_peer_pmtu TCP: remove TCP_DEBUG net: Fix driver name for mdio-gpio.c ipv4: tcp: fix TOS value in ACK messages sent from TIME_WAIT rtnetlink: Add missing manual netlink notification in dev_change_net_namespaces ipv4: fix ipsec forward performance regression jme: fix irq storm after suspend/resume route: fix ICMP redirect validation net: hold sock reference while processing tx timestamps tcp: md5: add more const attributes Add ethtool -g support to virtio_net ... Fix up conflicts in: - drivers/net/Kconfig: The split-up generated a trivial conflict with removal of a stale reference to Documentation/networking/net-modules.txt. Remove it from the new location instead. - fs/sysfs/dir.c: Fairly nasty conflicts with the sysfs rb-tree usage, conflicting with Eric Biederman's changes for tagged directories.
author: Linus Torvalds <torvalds@linux-foundation.org> 2011-10-25 13:25:22 +0200
committer: Linus Torvalds <torvalds@linux-foundation.org> 2011-10-25 13:25:22 +0200
commit: 8a9ea3237e7eb5c25f09e429ad242ae5a3d5ea22 (patch)
tree: a0a63398a9983667d52cbbbf4e2405b4f22b1d83 /net/ipv4
parent: 1be025d3cb40cd295123af2c394f7229ef9b30ca (diff)
parent: 8b3408f8ee994973869d8ba32c5bf482bc4ddca4 (diff)
36 files changed, 517 insertions, 392 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index dd2b9478ddd..1b5096a9875 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -893,7 +893,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 EXPORT_SYMBOL(inet_ioctl);
 
 #ifdef CONFIG_COMPAT
-int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
 	int err = -ENOIOCTLCMD;
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 2c2a98e402e..86f3b885b4f 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -476,7 +476,7 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 	doi = doi_def->doi;
 	doi_type = doi_def->type;
 
-	if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
+	if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
 		goto doi_add_return;
 	for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) {
 		switch (doi_def->tags[iter]) {
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index bc19bd06dd0..c6b5092f29a 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -258,7 +258,7 @@ static struct in_device *inetdev_init(struct net_device *dev)
 		ip_mc_up(in_dev);
 
 	/* we can receive as soon as ip_ptr is set -- do this last */
-	rcu_assign_pointer(dev->ip_ptr, in_dev);
+	RCU_INIT_POINTER(dev->ip_ptr, in_dev);
 out:
 	return in_dev;
 out_kfree:
@@ -291,7 +291,7 @@ static void inetdev_destroy(struct in_device *in_dev)
 		inet_free_ifa(ifa);
 	}
 
-	rcu_assign_pointer(dev->ip_ptr, NULL);
+	RCU_INIT_POINTER(dev->ip_ptr, NULL);
 
 	devinet_sysctl_unregister(in_dev);
 	neigh_parms_release(&arp_tbl, in_dev->arp_parms);
@@ -1175,7 +1175,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
 	switch (event) {
 	case NETDEV_REGISTER:
 		printk(KERN_DEBUG "inetdev_event: bug\n");
-		rcu_assign_pointer(dev->ip_ptr, NULL);
+		RCU_INIT_POINTER(dev->ip_ptr, NULL);
 		break;
 	case NETDEV_UP:
 		if (!inetdev_valid_mtu(dev->mtu))
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index de9e2978476..89d6f71a6a9 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -204,7 +204,7 @@ static inline struct tnode *node_parent_rcu(const struct rt_trie_node *node)
 	return (struct tnode *)(parent & ~NODE_TYPE_MASK);
 }
 
-/* Same as rcu_assign_pointer
+/* Same as RCU_INIT_POINTER
  * but that macro() assumes that value is a pointer.
  */
 static inline void node_set_parent(struct rt_trie_node *node, struct tnode *ptr)
@@ -528,7 +528,7 @@ static void tnode_put_child_reorg(struct tnode *tn, int i, struct rt_trie_node *
 	if (n)
 		node_set_parent(n, tn);
 
-	rcu_assign_pointer(tn->child[i], n);
+	RCU_INIT_POINTER(tn->child[i], n);
 }
 
 #define MAX_WORK 10
@@ -1014,7 +1014,7 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
 
 		tp = node_parent((struct rt_trie_node *) tn);
 		if (!tp)
-			rcu_assign_pointer(t->trie, (struct rt_trie_node *)tn);
+			RCU_INIT_POINTER(t->trie, (struct rt_trie_node *)tn);
 
 		tnode_free_flush();
 		if (!tp)
@@ -1026,7 +1026,7 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
 	if (IS_TNODE(tn))
 		tn = (struct tnode *)resize(t, (struct tnode *)tn);
 
-	rcu_assign_pointer(t->trie, (struct rt_trie_node *)tn);
+	RCU_INIT_POINTER(t->trie, (struct rt_trie_node *)tn);
 	tnode_free_flush();
 }
 
@@ -1163,7 +1163,7 @@ static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen)
 			put_child(t, (struct tnode *)tp, cindex,
 				  (struct rt_trie_node *)tn);
 		} else {
-			rcu_assign_pointer(t->trie, (struct rt_trie_node *)tn);
+			RCU_INIT_POINTER(t->trie, (struct rt_trie_node *)tn);
 			tp = tn;
 		}
 	}
@@ -1621,7 +1621,7 @@ static void trie_leaf_remove(struct trie *t, struct leaf *l)
 		put_child(t, (struct tnode *)tp, cindex, NULL);
 		trie_rebalance(t, tp);
 	} else
-		rcu_assign_pointer(t->trie, NULL);
+		RCU_INIT_POINTER(t->trie, NULL);
 
 	free_leaf(l);
 }
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index dbfc21de347..8cb1ebb7cd7 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -34,7 +34,7 @@ int gre_add_protocol(const struct gre_protocol *proto, u8 version)
 	if (gre_proto[version])
 		goto err_out_unlock;
 
-	rcu_assign_pointer(gre_proto[version], proto);
+	RCU_INIT_POINTER(gre_proto[version], proto);
 	spin_unlock(&gre_proto_lock);
 	return 0;
 
@@ -54,7 +54,7 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
 	if (rcu_dereference_protected(gre_proto[version],
 			lockdep_is_held(&gre_proto_lock)) != proto)
 		goto err_out_unlock;
-	rcu_assign_pointer(gre_proto[version], NULL);
+	RCU_INIT_POINTER(gre_proto[version], NULL);
 	spin_unlock(&gre_proto_lock);
 	synchronize_rcu();
 	return 0;
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 23ef31baa1a..ab188ae12fd 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -1152,10 +1152,9 @@ static int __net_init icmp_sk_init(struct net *net)
 		net->ipv4.icmp_sk[i] = sk;
 
 		/* Enough space for 2 64K ICMP packets, including
-		 * sk_buff struct overhead.
+		 * sk_buff/skb_shared_info struct overhead.
 		 */
-		sk->sk_sndbuf =
-			(2 * ((64 * 1024) + sizeof(struct sk_buff)));
+		sk->sk_sndbuf =	2 * SKB_TRUESIZE(64 * 1024);
 
 		/*
 		 * Speedup sock_wfree()
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index d577199eabd..c7472eff2d5 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1009,7 +1009,7 @@ static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 
 	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 	   We will get multicast token leakage, when IFF_MULTICAST
-	   is changed. This check should be done in dev->set_multicast_list
+	   is changed. This check should be done in ndo_set_rx_mode
 	   routine. Something sort of:
 	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 	   --ANK
@@ -1242,7 +1242,7 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
 
 	im->next_rcu = in_dev->mc_list;
 	in_dev->mc_count++;
-	rcu_assign_pointer(in_dev->mc_list, im);
+	RCU_INIT_POINTER(in_dev->mc_list, im);
 
 #ifdef CONFIG_IP_MULTICAST
 	igmpv3_del_delrec(in_dev, im->multiaddr);
@@ -1813,7 +1813,7 @@ int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
 	iml->next_rcu = inet->mc_list;
 	iml->sflist = NULL;
 	iml->sfmode = MCAST_EXCLUDE;
-	rcu_assign_pointer(inet->mc_list, iml);
+	RCU_INIT_POINTER(inet->mc_list, iml);
 	ip_mc_inc_group(in_dev, addr);
 	err = 0;
 done:
@@ -1835,7 +1835,7 @@ static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
 	}
 	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
 			iml->sfmode, psf->sl_count, psf->sl_addr, 0);
-	rcu_assign_pointer(iml->sflist, NULL);
+	RCU_INIT_POINTER(iml->sflist, NULL);
 	/* decrease mem now to avoid the memleak warning */
 	atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
 	kfree_rcu(psf, rcu);
@@ -2000,7 +2000,7 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct
 			atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
 			kfree_rcu(psl, rcu);
 		}
-		rcu_assign_pointer(pmc->sflist, newpsl);
+		RCU_INIT_POINTER(pmc->sflist, newpsl);
 		psl = newpsl;
 	}
 	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
@@ -2103,7 +2103,7 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
 	} else
 		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
 			0, NULL, 0);
-	rcu_assign_pointer(pmc->sflist, newpsl);
+	RCU_INIT_POINTER(pmc->sflist, newpsl);
 	pmc->sfmode = msf->imsf_fmode;
 	err = 0;
 done:
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 389a2e6a17f..f5e2bdaef94 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -108,6 +108,9 @@ static int inet_csk_diag_fill(struct sock *sk,
 		       icsk->icsk_ca_ops->name);
 	}
 
+	if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6))
+		RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
+
 	r->idiag_family = sk->sk_family;
 	r->idiag_state = sk->sk_state;
 	r->idiag_timer = 0;
@@ -130,6 +133,8 @@ static int inet_csk_diag_fill(struct sock *sk,
 			       &np->rcv_saddr);
 		ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 			       &np->daddr);
+		if (ext & (1 << (INET_DIAG_TOS - 1)))
+			RTA_PUT_U8(skb, INET_DIAG_TOS, np->tclass);
 	}
 #endif
 
diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c
index ef7ae6049a5..cc280a3f4f9 100644
--- a/net/ipv4/inet_lro.c
+++ b/net/ipv4/inet_lro.c
@@ -244,11 +244,11 @@ static void lro_add_frags(struct net_lro_desc *lro_desc,
 	skb->truesize += truesize;
 
 	skb_frags[0].page_offset += hlen;
-	skb_frags[0].size -= hlen;
+	skb_frag_size_sub(&skb_frags[0], hlen);
 
 	while (tcp_data_len > 0) {
 		*(lro_desc->next_frag) = *skb_frags;
-		tcp_data_len -= skb_frags->size;
+		tcp_data_len -= skb_frag_size(skb_frags);
 		lro_desc->next_frag++;
 		skb_frags++;
 		skb_shinfo(skb)->nr_frags++;
@@ -400,14 +400,14 @@ static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr,
 	skb_frags = skb_shinfo(skb)->frags;
 	while (data_len > 0) {
 		*skb_frags = *frags;
-		data_len -= frags->size;
+		data_len -= skb_frag_size(frags);
 		skb_frags++;
 		frags++;
 		skb_shinfo(skb)->nr_frags++;
 	}
 
 	skb_shinfo(skb)->frags[0].page_offset += hdr_len;
-	skb_shinfo(skb)->frags[0].size -= hdr_len;
+	skb_frag_size_sub(&skb_shinfo(skb)->frags[0], hdr_len);
 
 	skb->ip_summed = ip_summed;
 	skb->csum = sum;
@@ -433,7 +433,7 @@ static struct sk_buff *__lro_proc_segment(struct net_lro_mgr *lro_mgr,
 	if (!lro_mgr->get_frag_header ||
 	    lro_mgr->get_frag_header(frags, (void *)&mac_hdr, (void *)&iph,
 				     (void *)&tcph, &flags, priv)) {
-		mac_hdr = page_address(frags->page) + frags->page_offset;
+		mac_hdr = skb_frag_address(frags);
 		goto out1;
 	}
 
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 3c8dfa16614..44d65d546e3 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -183,6 +183,7 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int stat
 		tw->tw_daddr	    = inet->inet_daddr;
 		tw->tw_rcv_saddr    = inet->inet_rcv_saddr;
 		tw->tw_bound_dev_if = sk->sk_bound_dev_if;
+		tw->tw_tos	    = inet->tos;
 		tw->tw_num	    = inet->inet_num;
 		tw->tw_state	    = TCP_TIME_WAIT;
 		tw->tw_substate	    = state;
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 0e0ab98abc6..fdaabf2f2b6 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -599,8 +599,8 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		head->next = clone;
 		skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
 		skb_frag_list_init(head);
-		for (i=0; i<skb_shinfo(head)->nr_frags; i++)
-			plen += skb_shinfo(head)->frags[i].size;
+		for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
+			plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
 		clone->len = clone->data_len = head->data_len - plen;
 		head->data_len -= clone->len;
 		head->len -= clone->len;
@@ -682,6 +682,42 @@ int ip_defrag(struct sk_buff *skb, u32 user)
 }
 EXPORT_SYMBOL(ip_defrag);
 
+struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
+{
+	const struct iphdr *iph;
+	u32 len;
+
+	if (skb->protocol != htons(ETH_P_IP))
+		return skb;
+
+	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+		return skb;
+
+	iph = ip_hdr(skb);
+	if (iph->ihl < 5 || iph->version != 4)
+		return skb;
+	if (!pskb_may_pull(skb, iph->ihl*4))
+		return skb;
+	iph = ip_hdr(skb);
+	len = ntohs(iph->tot_len);
+	if (skb->len < len || len < (iph->ihl * 4))
+		return skb;
+
+	if (ip_is_fragment(ip_hdr(skb))) {
+		skb = skb_share_check(skb, GFP_ATOMIC);
+		if (skb) {
+			if (pskb_trim_rcsum(skb, len))
+				return skb;
+			memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+			if (ip_defrag(skb, user))
+				return NULL;
+			skb->rxhash = 0;
+		}
+	}
+	return skb;
+}
+EXPORT_SYMBOL(ip_check_defrag);
+
 #ifdef CONFIG_SYSCTL
 static int zero;
 
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index d7bb94c4834..d55110e9312 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -835,8 +835,6 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
 	if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
 	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
 		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
-		if (max_headroom > dev->needed_headroom)
-			dev->needed_headroom = max_headroom;
 		if (!new_skb) {
 			ip_rt_put(rt);
 			dev->stats.tx_dropped++;
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 8c6563361ab..0bc95f3977d 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -989,13 +989,13 @@ alloc_new_skb:
 			if (page && (left = PAGE_SIZE - off) > 0) {
 				if (copy >= left)
 					copy = left;
-				if (page != frag->page) {
+				if (page != skb_frag_page(frag)) {
 					if (i == MAX_SKB_FRAGS) {
 						err = -EMSGSIZE;
 						goto error;
 					}
-					get_page(page);
 					skb_fill_page_desc(skb, i, page, off, 0);
+					skb_frag_ref(skb, i);
 					frag = &skb_shinfo(skb)->frags[i];
 				}
 			} else if (i < MAX_SKB_FRAGS) {
@@ -1015,12 +1015,13 @@ alloc_new_skb:
 				err = -EMSGSIZE;
 				goto error;
 			}
-			if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) {
+			if (getfrag(from, skb_frag_address(frag)+skb_frag_size(frag),
+				    offset, copy, skb->len, skb) < 0) {
 				err = -EFAULT;
 				goto error;
 			}
 			cork->off += copy;
-			frag->size += copy;
+			skb_frag_size_add(frag, copy);
 			skb->len += copy;
 			skb->data_len += copy;
 			skb->truesize += copy;
@@ -1229,7 +1230,7 @@ ssize_t	ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
 		if (len > size)
 			len = size;
 		if (skb_can_coalesce(skb, i, page, offset)) {
-			skb_shinfo(skb)->frags[i-1].size += len;
+			skb_frag_size_add(&skb_shinfo(skb)->frags[i-1], len);
 		} else if (i < MAX_SKB_FRAGS) {
 			get_page(page);
 			skb_fill_page_desc(skb, i, page, offset, len);
@@ -1465,7 +1466,7 @@ static int ip_reply_glue_bits(void *dptr, char *to, int offset,
  *     	structure to pass arguments.
  */
 void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
-		   struct ip_reply_arg *arg, unsigned int len)
+		   const struct ip_reply_arg *arg, unsigned int len)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct ip_options_data replyopts;
@@ -1488,7 +1489,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
 	}
 
 	flowi4_init_output(&fl4, arg->bound_dev_if, 0,
-			   RT_TOS(ip_hdr(skb)->tos),
+			   RT_TOS(arg->tos),
 			   RT_SCOPE_UNIVERSE, sk->sk_protocol,
 			   ip_reply_arg_flowi_flags(arg),
 			   daddr, rt->rt_spec_dst,
@@ -1505,7 +1506,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
 	   with locally disabled BH and that sk cannot be already spinlocked.
 	 */
 	bh_lock_sock(sk);
-	inet->tos = ip_hdr(skb)->tos;
+	inet->tos = arg->tos;
 	sk->sk_priority = skb->priority;
 	sk->sk_protocol = ip_hdr(skb)->protocol;
 	sk->sk_bound_dev_if = arg->bound_dev_if;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8905e92f896..09ff51bf16a 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -33,6 +33,7 @@
 #include <linux/netfilter.h>
 #include <linux/route.h>
 #include <linux/mroute.h>
+#include <net/inet_ecn.h>
 #include <net/route.h>
 #include <net/xfrm.h>
 #include <net/compat.h>
@@ -578,8 +579,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		break;
 	case IP_TOS:	/* This sets both TOS and Precedence */
 		if (sk->sk_type == SOCK_STREAM) {
-			val &= ~3;
-			val |= inet->tos & 3;
+			val &= ~INET_ECN_MASK;
+			val |= inet->tos & INET_ECN_MASK;
 		}
 		if (inet->tos != val) {
 			inet->tos = val;
@@ -961,7 +962,7 @@ mc_msf_out:
 		break;
 
 	case IP_TRANSPARENT:
-		if (!capable(CAP_NET_ADMIN)) {
+		if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
 			err = -EPERM;
 			break;
 		}
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 378b20b7ca6..065effd8349 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -231,7 +231,7 @@ static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t)
 	     (iter = rtnl_dereference(*tp)) != NULL;
 	     tp = &iter->next) {
 		if (t == iter) {
-			rcu_assign_pointer(*tp, t->next);
+			RCU_INIT_POINTER(*tp, t->next);
 			break;
 		}
 	}
@@ -241,8 +241,8 @@ static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t)
 {
 	struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t);
 
-	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
-	rcu_assign_pointer(*tp, t);
+	RCU_INIT_POINTER(t->next, rtnl_dereference(*tp));
+	RCU_INIT_POINTER(*tp, t);
 }
 
 static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
@@ -301,7 +301,7 @@ static void ipip_tunnel_uninit(struct net_device *dev)
 	struct ipip_net *ipn = net_generic(net, ipip_net_id);
 
 	if (dev == ipn->fb_tunnel_dev)
-		rcu_assign_pointer(ipn->tunnels_wc[0], NULL);
+		RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL);
 	else
 		ipip_tunnel_unlink(ipn, netdev_priv(dev));
 	dev_put(dev);
@@ -791,7 +791,7 @@ static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
 		return -ENOMEM;
 
 	dev_hold(dev);
-	rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
+	RCU_INIT_POINTER(ipn->tunnels_wc[0], tunnel);
 	return 0;
 }
 
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 58e87915797..6164e982e0e 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1176,7 +1176,7 @@ static void mrtsock_destruct(struct sock *sk)
 	ipmr_for_each_table(mrt, net) {
 		if (sk == rtnl_dereference(mrt->mroute_sk)) {
 			IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
-			rcu_assign_pointer(mrt->mroute_sk, NULL);
+			RCU_INIT_POINTER(mrt->mroute_sk, NULL);
 			mroute_clean_tables(mrt);
 		}
 	}
@@ -1203,7 +1203,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
 		return -ENOENT;
 
 	if (optname != MRT_INIT) {
-		if (sk != rcu_dereference_raw(mrt->mroute_sk) &&
+		if (sk != rcu_access_pointer(mrt->mroute_sk) &&
 		    !capable(CAP_NET_ADMIN))
 			return -EACCES;
 	}
@@ -1224,13 +1224,13 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
 
 		ret = ip_ra_control(sk, 1, mrtsock_destruct);
 		if (ret == 0) {
-			rcu_assign_pointer(mrt->mroute_sk, sk);
+			RCU_INIT_POINTER(mrt->mroute_sk, sk);
 			IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
 		}
 		rtnl_unlock();
 		return ret;
 	case MRT_DONE:
-		if (sk != rcu_dereference_raw(mrt->mroute_sk))
+		if (sk != rcu_access_pointer(mrt->mroute_sk))
 			return -EACCES;
 		return ip_ra_control(sk, 0, NULL);
 	case MRT_ADD_VIF:
diff --git a/net/ipv4/netfilter/nf_nat_amanda.c b/net/ipv4/netfilter/nf_nat_amanda.c
index 703f366fd23..7b22382ff0e 100644
--- a/net/ipv4/netfilter/nf_nat_amanda.c
+++ b/net/ipv4/netfilter/nf_nat_amanda.c
@@ -70,14 +70,14 @@ static unsigned int help(struct sk_buff *skb,
 
 static void __exit nf_nat_amanda_fini(void)
 {
-	rcu_assign_pointer(nf_nat_amanda_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_amanda_hook, NULL);
 	synchronize_rcu();
 }
 
 static int __init nf_nat_amanda_init(void)
 {
 	BUG_ON(nf_nat_amanda_hook != NULL);
-	rcu_assign_pointer(nf_nat_amanda_hook, help);
+	RCU_INIT_POINTER(nf_nat_amanda_hook, help);
 	return 0;
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index 3346de5d94d..447bc5cfdc6 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -514,7 +514,7 @@ int nf_nat_protocol_register(const struct nf_nat_protocol *proto)
 		ret = -EBUSY;
 		goto out;
 	}
-	rcu_assign_pointer(nf_nat_protos[proto->protonum], proto);
+	RCU_INIT_POINTER(nf_nat_protos[proto->protonum], proto);
  out:
 	spin_unlock_bh(&nf_nat_lock);
 	return ret;
@@ -525,7 +525,7 @@ EXPORT_SYMBOL(nf_nat_protocol_register);
 void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto)
 {
 	spin_lock_bh(&nf_nat_lock);
-	rcu_assign_pointer(nf_nat_protos[proto->protonum],
+	RCU_INIT_POINTER(nf_nat_protos[proto->protonum],
 			   &nf_nat_unknown_protocol);
 	spin_unlock_bh(&nf_nat_lock);
 	synchronize_rcu();
@@ -736,10 +736,10 @@ static int __init nf_nat_init(void)
 	/* Sew in builtin protocols. */
 	spin_lock_bh(&nf_nat_lock);
 	for (i = 0; i < MAX_IP_NAT_PROTO; i++)
-		rcu_assign_pointer(nf_nat_protos[i], &nf_nat_unknown_protocol);
-	rcu_assign_pointer(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp);
-	rcu_assign_pointer(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp);
-	rcu_assign_pointer(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp);
+		RCU_INIT_POINTER(nf_nat_protos[i], &nf_nat_unknown_protocol);
+	RCU_INIT_POINTER(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp);
+	RCU_INIT_POINTER(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp);
+	RCU_INIT_POINTER(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp);
 	spin_unlock_bh(&nf_nat_lock);
 
 	/* Initialize fake conntrack so that NAT will skip it */
@@ -748,12 +748,12 @@ static int __init nf_nat_init(void)
 	l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
 
 	BUG_ON(nf_nat_seq_adjust_hook != NULL);
-	rcu_assign_pointer(nf_nat_seq_adjust_hook, nf_nat_seq_adjust);
+	RCU_INIT_POINTER(nf_nat_seq_adjust_hook, nf_nat_seq_adjust);
 	BUG_ON(nfnetlink_parse_nat_setup_hook != NULL);
-	rcu_assign_pointer(nfnetlink_parse_nat_setup_hook,
+	RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook,
 			   nfnetlink_parse_nat_setup);
 	BUG_ON(nf_ct_nat_offset != NULL);
-	rcu_assign_pointer(nf_ct_nat_offset, nf_nat_get_offset);
+	RCU_INIT_POINTER(nf_ct_nat_offset, nf_nat_get_offset);
 	return 0;
 
  cleanup_extend:
@@ -766,9 +766,9 @@ static void __exit nf_nat_cleanup(void)
 	unregister_pernet_subsys(&nf_nat_net_ops);
 	nf_ct_l3proto_put(l3proto);
 	nf_ct_extend_unregister(&nat_extend);
-	rcu_assign_pointer(nf_nat_seq_adjust_hook, NULL);
-	rcu_assign_pointer(nfnetlink_parse_nat_setup_hook, NULL);
-	rcu_assign_pointer(nf_ct_nat_offset, NULL);
+	RCU_INIT_POINTER(nf_nat_seq_adjust_hook, NULL);
+	RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, NULL);
+	RCU_INIT_POINTER(nf_ct_nat_offset, NULL);
 	synchronize_net();
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_ftp.c b/net/ipv4/netfilter/nf_nat_ftp.c
index dc73abb3fe2..e462a957d08 100644
--- a/net/ipv4/netfilter/nf_nat_ftp.c
+++ b/net/ipv4/netfilter/nf_nat_ftp.c
@@ -113,14 +113,14 @@ out:
 
 static void __exit nf_nat_ftp_fini(void)
 {
-	rcu_assign_pointer(nf_nat_ftp_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_ftp_hook, NULL);
 	synchronize_rcu();
 }
 
 static int __init nf_nat_ftp_init(void)
 {
 	BUG_ON(nf_nat_ftp_hook != NULL);
-	rcu_assign_pointer(nf_nat_ftp_hook, nf_nat_ftp);
+	RCU_INIT_POINTER(nf_nat_ftp_hook, nf_nat_ftp);
 	return 0;
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c
index 790f3160e01..b9a1136addb 100644
--- a/net/ipv4/netfilter/nf_nat_h323.c
+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -581,30 +581,30 @@ static int __init init(void)
 	BUG_ON(nat_callforwarding_hook != NULL);
 	BUG_ON(nat_q931_hook != NULL);
 
-	rcu_assign_pointer(set_h245_addr_hook, set_h245_addr);
-	rcu_assign_pointer(set_h225_addr_hook, set_h225_addr);
-	rcu_assign_pointer(set_sig_addr_hook, set_sig_addr);
-	rcu_assign_pointer(set_ras_addr_hook, set_ras_addr);
-	rcu_assign_pointer(nat_rtp_rtcp_hook, nat_rtp_rtcp);
-	rcu_assign_pointer(nat_t120_hook, nat_t120);
-	rcu_assign_pointer(nat_h245_hook, nat_h245);
-	rcu_assign_pointer(nat_callforwarding_hook, nat_callforwarding);
-	rcu_assign_pointer(nat_q931_hook, nat_q931);
+	RCU_INIT_POINTER(set_h245_addr_hook, set_h245_addr);
+	RCU_INIT_POINTER(set_h225_addr_hook, set_h225_addr);
+	RCU_INIT_POINTER(set_sig_addr_hook, set_sig_addr);
+	RCU_INIT_POINTER(set_ras_addr_hook, set_ras_addr);
+	RCU_INIT_POINTER(nat_rtp_rtcp_hook, nat_rtp_rtcp);
+	RCU_INIT_POINTER(nat_t120_hook, nat_t120);
+	RCU_INIT_POINTER(nat_h245_hook, nat_h245);
+	RCU_INIT_POINTER(nat_callforwarding_hook, nat_callforwarding);
+	RCU_INIT_POINTER(nat_q931_hook, nat_q931);
 	return 0;
 }
 
 /****************************************************************************/
 static void __exit fini(void)
 {
-	rcu_assign_pointer(set_h245_addr_hook, NULL);
-	rcu_assign_pointer(set_h225_addr_hook, NULL);
-	rcu_assign_pointer(set_sig_addr_hook, NULL);
-	rcu_assign_pointer(set_ras_addr_hook, NULL);
-	rcu_assign_pointer(nat_rtp_rtcp_hook, NULL);
-	rcu_assign_pointer(nat_t120_hook, NULL);
-	rcu_assign_pointer(nat_h245_hook, NULL);
-	rcu_assign_pointer(nat_callforwarding_hook, NULL);
-	rcu_assign_pointer(nat_q931_hook, NULL);
+	RCU_INIT_POINTER(set_h245_addr_hook, NULL);
+	RCU_INIT_POINTER(set_h225_addr_hook, NULL);
+	RCU_INIT_POINTER(set_sig_addr_hook, NULL);
+	RCU_INIT_POINTER(set_ras_addr_hook, NULL);
+	RCU_INIT_POINTER(nat_rtp_rtcp_hook, NULL);
+	RCU_INIT_POINTER(nat_t120_hook, NULL);
+	RCU_INIT_POINTER(nat_h245_hook, NULL);
+	RCU_INIT_POINTER(nat_callforwarding_hook, NULL);
+	RCU_INIT_POINTER(nat_q931_hook, NULL);
 	synchronize_rcu();
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_irc.c b/net/ipv4/netfilter/nf_nat_irc.c
index 535e1a80235..979ae165f4e 100644
--- a/net/ipv4/netfilter/nf_nat_irc.c
+++ b/net/ipv4/netfilter/nf_nat_irc.c
@@ -75,14 +75,14 @@ static unsigned int help(struct sk_buff *skb,
 
 static void __exit nf_nat_irc_fini(void)
 {
-	rcu_assign_pointer(nf_nat_irc_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_irc_hook, NULL);
 	synchronize_rcu();
 }
 
 static int __init nf_nat_irc_init(void)
 {
 	BUG_ON(nf_nat_irc_hook != NULL);
-	rcu_assign_pointer(nf_nat_irc_hook, help);
+	RCU_INIT_POINTER(nf_nat_irc_hook, help);
 	return 0;
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index 4c060038d29..3e8284ba46b 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -282,25 +282,25 @@ static int __init nf_nat_helper_pptp_init(void)
 	nf_nat_need_gre();
 
 	BUG_ON(nf_nat_pptp_hook_outbound != NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_outbound, pptp_outbound_pkt);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_outbound, pptp_outbound_pkt);
 
 	BUG_ON(nf_nat_pptp_hook_inbound != NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_inbound, pptp_inbound_pkt);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_inbound, pptp_inbound_pkt);
 
 	BUG_ON(nf_nat_pptp_hook_exp_gre != NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_exp_gre, pptp_exp_gre);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_exp_gre, pptp_exp_gre);
 
 	BUG_ON(nf_nat_pptp_hook_expectfn != NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_expectfn, pptp_nat_expected);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_expectfn, pptp_nat_expected);
 	return 0;
 }
 
 static void __exit nf_nat_helper_pptp_fini(void)
 {
-	rcu_assign_pointer(nf_nat_pptp_hook_expectfn, NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_exp_gre, NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_inbound, NULL);
-	rcu_assign_pointer(nf_nat_pptp_hook_outbound, NULL);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_expectfn, NULL);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_exp_gre, NULL);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_inbound, NULL);
+	RCU_INIT_POINTER(nf_nat_pptp_hook_outbound, NULL);
 	synchronize_rcu();
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c
index e40cf7816fd..78844d9208f 100644
--- a/net/ipv4/netfilter/nf_nat_sip.c
+++ b/net/ipv4/netfilter/nf_nat_sip.c
@@ -528,13 +528,13 @@ err1:
 
 static void __exit nf_nat_sip_fini(void)
 {
-	rcu_assign_pointer(nf_nat_sip_hook, NULL);
-	rcu_assign_pointer(nf_nat_sip_seq_adjust_hook, NULL);
-	rcu_assign_pointer(nf_nat_sip_expect_hook, NULL);
-	rcu_assign_pointer(nf_nat_sdp_addr_hook, NULL);
-	rcu_assign_pointer(nf_nat_sdp_port_hook, NULL);
-	rcu_assign_pointer(nf_nat_sdp_session_hook, NULL);
-	rcu_assign_pointer(nf_nat_sdp_media_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sip_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sip_expect_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sdp_addr_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sdp_port_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sdp_session_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_sdp_media_hook, NULL);
 	synchronize_rcu();
 }
 
@@ -547,13 +547,13 @@ static int __init nf_nat_sip_init(void)
 	BUG_ON(nf_nat_sdp_port_hook != NULL);
 	BUG_ON(nf_nat_sdp_session_hook != NULL);
 	BUG_ON(nf_nat_sdp_media_hook != NULL);
-	rcu_assign_pointer(nf_nat_sip_hook, ip_nat_sip);
-	rcu_assign_pointer(nf_nat_sip_seq_adjust_hook, ip_nat_sip_seq_adjust);
-	rcu_assign_pointer(nf_nat_sip_expect_hook, ip_nat_sip_expect);
-	rcu_assign_pointer(nf_nat_sdp_addr_hook, ip_nat_sdp_addr);
-	rcu_assign_pointer(nf_nat_sdp_port_hook, ip_nat_sdp_port);
-	rcu_assign_pointer(nf_nat_sdp_session_hook, ip_nat_sdp_session);
-	rcu_assign_pointer(nf_nat_sdp_media_hook, ip_nat_sdp_media);
+	RCU_INIT_POINTER(nf_nat_sip_hook, ip_nat_sip);
+	RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, ip_nat_sip_seq_adjust);
+	RCU_INIT_POINTER(nf_nat_sip_expect_hook, ip_nat_sip_expect);
+	RCU_INIT_POINTER(nf_nat_sdp_addr_hook, ip_nat_sdp_addr);
+	RCU_INIT_POINTER(nf_nat_sdp_port_hook, ip_nat_sdp_port);
+	RCU_INIT_POINTER(nf_nat_sdp_session_hook, ip_nat_sdp_session);
+	RCU_INIT_POINTER(nf_nat_sdp_media_hook, ip_nat_sdp_media);
 	return 0;
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_snmp_basic.c b/net/ipv4/netfilter/nf_nat_snmp_basic.c
index 076b7c8c4aa..d1cb412c18e 100644
--- a/net/ipv4/netfilter/nf_nat_snmp_basic.c
+++ b/net/ipv4/netfilter/nf_nat_snmp_basic.c
@@ -1310,7 +1310,7 @@ static int __init nf_nat_snmp_basic_init(void)
 	int ret = 0;
 
 	BUG_ON(nf_nat_snmp_hook != NULL);
-	rcu_assign_pointer(nf_nat_snmp_hook, help);
+	RCU_INIT_POINTER(nf_nat_snmp_hook, help);
 
 	ret = nf_conntrack_helper_register(&snmp_trap_helper);
 	if (ret < 0) {
@@ -1322,7 +1322,7 @@ static int __init nf_nat_snmp_basic_init(void)
 
 static void __exit nf_nat_snmp_basic_fini(void)
 {
-	rcu_assign_pointer(nf_nat_snmp_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_snmp_hook, NULL);
 	nf_conntrack_helper_unregister(&snmp_trap_helper);
 }
 
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index a6e606e8482..92900482ede 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -284,7 +284,7 @@ static int __init nf_nat_standalone_init(void)
 
 #ifdef CONFIG_XFRM
 	BUG_ON(ip_nat_decode_session != NULL);
-	rcu_assign_pointer(ip_nat_decode_session, nat_decode_session);
+	RCU_INIT_POINTER(ip_nat_decode_session, nat_decode_session);
 #endif
 	ret = nf_nat_rule_init();
 	if (ret < 0) {
@@ -302,7 +302,7 @@ static int __init nf_nat_standalone_init(void)
 	nf_nat_rule_cleanup();
  cleanup_decode_session:
 #ifdef CONFIG_XFRM
-	rcu_assign_pointer(ip_nat_decode_session, NULL);
+	RCU_INIT_POINTER(ip_nat_decode_session, NULL);
 	synchronize_net();
 #endif
 	return ret;
@@ -313,7 +313,7 @@ static void __exit nf_nat_standalone_fini(void)
 	nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
 	nf_nat_rule_cleanup();
 #ifdef CONFIG_XFRM
-	rcu_assign_pointer(ip_nat_decode_session, NULL);
+	RCU_INIT_POINTER(ip_nat_decode_session, NULL);
 	synchronize_net();
 #endif
 	/* Conntrack caches are unregistered in nf_conntrack_cleanup */
diff --git a/net/ipv4/netfilter/nf_nat_tftp.c b/net/ipv4/netfilter/nf_nat_tftp.c
index 7274a43c7a1..a2901bf829c 100644
--- a/net/ipv4/netfilter/nf_nat_tftp.c
+++ b/net/ipv4/netfilter/nf_nat_tftp.c
@@ -36,14 +36,14 @@ static unsigned int help(struct sk_buff *skb,
 
 static void __exit nf_nat_tftp_fini(void)
 {
-	rcu_assign_pointer(nf_nat_tftp_hook, NULL);
+	RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
 	synchronize_rcu();
 }
 
 static int __init nf_nat_tftp_init(void)
 {
 	BUG_ON(nf_nat_tftp_hook != NULL);
-	rcu_assign_pointer(nf_nat_tftp_hook, help);
+	RCU_INIT_POINTER(nf_nat_tftp_hook, help);
 	return 0;
 }
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 075212e41b8..155138d8ec8 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -120,7 +120,6 @@
 
 static int ip_rt_max_size;
 static int ip_rt_gc_timeout __read_mostly	= RT_GC_TIMEOUT;
-static int ip_rt_gc_interval __read_mostly	= 60 * HZ;
 static int ip_rt_gc_min_interval __read_mostly	= HZ / 2;
 static int ip_rt_redirect_number __read_mostly	= 9;
 static int ip_rt_redirect_load __read_mostly	= HZ / 50;
@@ -324,7 +323,7 @@ static struct rtable *rt_cache_get_first(struct seq_file *seq)
 	struct rtable *r = NULL;
 
 	for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
-		if (!rcu_dereference_raw(rt_hash_table[st->bucket].chain))
+		if (!rcu_access_pointer(rt_hash_table[st->bucket].chain))
 			continue;
 		rcu_read_lock_bh();
 		r = rcu_dereference_bh(rt_hash_table[st->bucket].chain);
@@ -350,7 +349,7 @@ static struct rtable *__rt_cache_get_next(struct seq_file *seq,
 		do {
 			if (--st->bucket < 0)
 				return NULL;
-		} while (!rcu_dereference_raw(rt_hash_table[st->bucket].chain));
+		} while (!rcu_access_pointer(rt_hash_table[st->bucket].chain));
 		rcu_read_lock_bh();
 		r = rcu_dereference_bh(rt_hash_table[st->bucket].chain);
 	}
@@ -761,7 +760,7 @@ static void rt_do_flush(struct net *net, int process_context)
 
 		if (process_context && need_resched())
 			cond_resched();
-		rth = rcu_dereference_raw(rt_hash_table[i].chain);
+		rth = rcu_access_pointer(rt_hash_table[i].chain);
 		if (!rth)
 			continue;
 
@@ -1309,7 +1308,12 @@ static void rt_del(unsigned hash, struct rtable *rt)
 void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
 		    __be32 saddr, struct net_device *dev)
 {
+	int s, i;
 	struct in_device *in_dev = __in_dev_get_rcu(dev);
+	struct rtable *rt;
+	__be32 skeys[2] = { saddr, 0 };
+	int    ikeys[2] = { dev->ifindex, 0 };
+	struct flowi4 fl4;
 	struct inet_peer *peer;
 	struct net *net;
 
@@ -1332,13 +1336,34 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
 			goto reject_redirect;
 	}
 
-	peer = inet_getpeer_v4(daddr, 1);
-	if (peer) {
-		peer->redirect_learned.a4 = new_gw;
+	memset(&fl4, 0, sizeof(fl4));
+	fl4.daddr = daddr;
+	for (s = 0; s < 2; s++) {
+		for (i = 0; i < 2; i++) {
+			fl4.flowi4_oif = ikeys[i];
+			fl4.saddr = skeys[s];
+			rt = __ip_route_output_key(net, &fl4);
+			if (IS_ERR(rt))
+				continue;
 
-		inet_putpeer(peer);
+			if (rt->dst.error || rt->dst.dev != dev ||
+			    rt->rt_gateway != old_gw) {
+				ip_rt_put(rt);
+				continue;
+			}
+
+			if (!rt->peer)
+				rt_bind_peer(rt, rt->rt_dst, 1);
+
+			peer = rt->peer;
+			if (peer) {
+				peer->redirect_learned.a4 = new_gw;
+				atomic_inc(&__rt_peer_genid);
+			}
 
-		atomic_inc(&__rt_peer_genid);
+			ip_rt_put(rt);
+			return;
+		}
 	}
 	return;
 
@@ -1568,11 +1593,10 @@ unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
 			est_mtu = mtu;
 			peer->pmtu_learned = mtu;
 			peer->pmtu_expires = pmtu_expires;
+			atomic_inc(&__rt_peer_genid);
 		}
 
 		inet_putpeer(peer);
-
-		atomic_inc(&__rt_peer_genid);
 	}
 	return est_mtu ? : new_mtu;
 }
@@ -3121,13 +3145,6 @@ static ctl_table ipv4_route_table[] = {
 		.proc_handler	= proc_dointvec_jiffies,
 	},
 	{
-		.procname	= "gc_interval",
-		.data		= &ip_rt_gc_interval,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_jiffies,
-	},
-	{
 		.procname	= "redirect_load",
 		.data		= &ip_rt_redirect_load,
 		.maxlen		= sizeof(int),
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 3bc5c8f7c71..d7b89b12f6d 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -265,7 +265,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 			     struct ip_options *opt)
 {
 	struct tcp_options_received tcp_opt;
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct inet_request_sock *ireq;
 	struct tcp_request_sock *treq;
 	struct tcp_sock *tp = tcp_sk(sk);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 46febcacb72..34f5db1e1c8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -374,7 +374,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 {
 	unsigned int mask;
 	struct sock *sk = sock->sk;
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	sock_poll_wait(file, sk_sleep(sk), wait);
 	if (sk->sk_state == TCP_LISTEN)
@@ -524,11 +524,11 @@ EXPORT_SYMBOL(tcp_ioctl);
 
 static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb)
 {
-	TCP_SKB_CB(skb)->flags |= TCPHDR_PSH;
+	TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
 	tp->pushed_seq = tp->write_seq;
 }
 
-static inline int forced_push(struct tcp_sock *tp)
+static inline int forced_push(const struct tcp_sock *tp)
 {
 	return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1));
 }
@@ -540,7 +540,7 @@ static inline void skb_entail(struct sock *sk, struct sk_buff *skb)
 
 	skb->csum    = 0;
 	tcb->seq     = tcb->end_seq = tp->write_seq;
-	tcb->flags   = TCPHDR_ACK;
+	tcb->tcp_flags = TCPHDR_ACK;
 	tcb->sacked  = 0;
 	skb_header_release(skb);
 	tcp_add_write_queue_tail(sk, skb);
@@ -813,7 +813,7 @@ new_segment:
 			goto wait_for_memory;
 
 		if (can_coalesce) {
-			skb_shinfo(skb)->frags[i - 1].size += copy;
+			skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
 		} else {
 			get_page(page);
 			skb_fill_page_desc(skb, i, page, offset, copy);
@@ -830,7 +830,7 @@ new_segment:
 		skb_shinfo(skb)->gso_segs = 0;
 
 		if (!copied)
-			TCP_SKB_CB(skb)->flags &= ~TCPHDR_PSH;
+			TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH;
 
 		copied += copy;
 		poffset += copy;
@@ -891,9 +891,9 @@ EXPORT_SYMBOL(tcp_sendpage);
 #define TCP_PAGE(sk)	(sk->sk_sndmsg_page)
 #define TCP_OFF(sk)	(sk->sk_sndmsg_off)
 
-static inline int select_size(struct sock *sk, int sg)
+static inline int select_size(const struct sock *sk, int sg)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	int tmp = tp->mss_cache;
 
 	if (sg) {
@@ -1058,8 +1058,7 @@ new_segment:
 
 				/* Update the skb. */
 				if (merge) {
-					skb_shinfo(skb)->frags[i - 1].size +=
-									copy;
+					skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
 				} else {
 					skb_fill_page_desc(skb, i, page, off, copy);
 					if (TCP_PAGE(sk)) {
@@ -1074,7 +1073,7 @@ new_segment:
 			}
 
 			if (!copied)
-				TCP_SKB_CB(skb)->flags &= ~TCPHDR_PSH;
+				TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH;
 
 			tp->write_seq += copy;
 			TCP_SKB_CB(skb)->end_seq += copy;
@@ -1194,13 +1193,11 @@ void tcp_cleanup_rbuf(struct sock *sk, int copied)
 	struct tcp_sock *tp = tcp_sk(sk);
 	int time_to_ack = 0;
 
-#if TCP_DEBUG
 	struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
 
 	WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq),
 	     "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n",
 	     tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt);
-#endif
 
 	if (inet_csk_ack_scheduled(sk)) {
 		const struct inet_connection_sock *icsk = inet_csk(sk);
@@ -2409,7 +2406,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
 		   unsigned int optlen)
 {
-	struct inet_connection_sock *icsk = inet_csk(sk);
+	const struct inet_connection_sock *icsk = inet_csk(sk);
 
 	if (level != SOL_TCP)
 		return icsk->icsk_af_ops->setsockopt(sk, level, optname,
@@ -2431,9 +2428,9 @@ EXPORT_SYMBOL(compat_tcp_setsockopt);
 #endif
 
 /* Return information about state of tcp endpoint in API format. */
-void tcp_get_info(struct sock *sk, struct tcp_info *info)
+void tcp_get_info(const struct sock *sk, struct tcp_info *info)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	u32 now = tcp_time_stamp;
 
@@ -2455,8 +2452,10 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 		info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale;
 	}
 
-	if (tp->ecn_flags&TCP_ECN_OK)
+	if (tp->ecn_flags & TCP_ECN_OK)
 		info->tcpi_options |= TCPI_OPT_ECN;
+	if (tp->ecn_flags & TCP_ECN_SEEN)
+		info->tcpi_options |= TCPI_OPT_ECN_SEEN;
 
 	info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto);
 	info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato);
@@ -2857,26 +2856,25 @@ EXPORT_SYMBOL(tcp_gro_complete);
 
 #ifdef CONFIG_TCP_MD5SIG
 static unsigned long tcp_md5sig_users;
-static struct tcp_md5sig_pool * __percpu *tcp_md5sig_pool;
+static struct tcp_md5sig_pool __percpu *tcp_md5sig_pool;
 static DEFINE_SPINLOCK(tcp_md5sig_pool_lock);
 
-static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool * __percpu *pool)
+static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool __percpu *pool)
 {
 	int cpu;
+
 	for_each_possible_cpu(cpu) {
-		struct tcp_md5sig_pool *p = *per_cpu_ptr(pool, cpu);
-		if (p) {
-			if (p->md5_desc.tfm)
-				crypto_free_hash(p->md5_desc.tfm);
-			kfree(p);
-		}
+		struct tcp_md5sig_pool *p = per_cpu_ptr(pool, cpu);
+
+		if (p->md5_desc.tfm)
+			crypto_free_hash(p->md5_desc.tfm);
 	}
 	free_percpu(pool);
 }
 
 void tcp_free_md5sig_pool(void)
 {
-	struct tcp_md5sig_pool * __percpu *pool = NULL;
+	struct tcp_md5sig_pool __percpu *pool = NULL;
 
 	spin_lock_bh(&tcp_md5sig_pool_lock);
 	if (--tcp_md5sig_users == 0) {
@@ -2889,30 +2887,24 @@ void tcp_free_md5sig_pool(void)
 }
 EXPORT_SYMBOL(tcp_free_md5sig_pool);
 
-static struct tcp_md5sig_pool * __percpu *
+static struct tcp_md5sig_pool __percpu *
 __tcp_alloc_md5sig_pool(struct sock *sk)
 {
 	int cpu;
-	struct tcp_md5sig_pool * __percpu *pool;
+	struct tcp_md5sig_pool __percpu *pool;
 
-	pool = alloc_percpu(struct tcp_md5sig_pool *);
+	pool = alloc_percpu(struct tcp_md5sig_pool);
 	if (!pool)
 		return NULL;
 
 	for_each_possible_cpu(cpu) {
-		struct tcp_md5sig_pool *p;
 		struct crypto_hash *hash;
 
-		p = kzalloc(sizeof(*p), sk->sk_allocation);
-		if (!p)
-			goto out_free;
-		*per_cpu_ptr(pool, cpu) = p;
-
 		hash = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
 		if (!hash || IS_ERR(hash))
 			goto out_free;
 
-		p->md5_desc.tfm = hash;
+		per_cpu_ptr(pool, cpu)->md5_desc.tfm = hash;
 	}
 	return pool;
 out_free:
@@ -2920,9 +2912,9 @@ out_free:
 	return NULL;
 }
 
-struct tcp_md5sig_pool * __percpu *tcp_alloc_md5sig_pool(struct sock *sk)
+struct tcp_md5sig_pool __percpu *tcp_alloc_md5sig_pool(struct sock *sk)
 {
-	struct tcp_md5sig_pool * __percpu *pool;
+	struct tcp_md5sig_pool __percpu *pool;
 	int alloc = 0;
 
 retry:
@@ -2941,7 +2933,7 @@ retry:
 
 	if (alloc) {
 		/* we cannot hold spinlock here because this may sleep. */
-		struct tcp_md5sig_pool * __percpu *p;
+		struct tcp_md5sig_pool __percpu *p;
 
 		p = __tcp_alloc_md5sig_pool(sk);
 		spin_lock_bh(&tcp_md5sig_pool_lock);
@@ -2974,7 +2966,7 @@ EXPORT_SYMBOL(tcp_alloc_md5sig_pool);
  */
 struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
 {
-	struct tcp_md5sig_pool * __percpu *p;
+	struct tcp_md5sig_pool __percpu *p;
 
 	local_bh_disable();
 
@@ -2985,7 +2977,7 @@ struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
 	spin_unlock(&tcp_md5sig_pool_lock);
 
 	if (p)
-		return *this_cpu_ptr(p);
+		return this_cpu_ptr(p);
 
 	local_bh_enable();
 	return NULL;
@@ -3000,23 +2992,25 @@ void tcp_put_md5sig_pool(void)
 EXPORT_SYMBOL(tcp_put_md5sig_pool);
 
 int tcp_md5_hash_header(struct tcp_md5sig_pool *hp,
-			struct tcphdr *th)
+			const struct tcphdr *th)
 {
 	struct scatterlist sg;
+	struct tcphdr hdr;
 	int err;
 
-	__sum16 old_checksum = th->check;
-	th->check = 0;
+	/* We are not allowed to change tcphdr, make a local copy */
+	memcpy(&hdr, th, sizeof(hdr));
+	hdr.check = 0;
+
 	/* options aren't included in the hash */
-	sg_init_one(&sg, th, sizeof(struct tcphdr));
-	err = crypto_hash_update(&hp->md5_desc, &sg, sizeof(struct tcphdr));
-	th->check = old_checksum;
+	sg_init_one(&sg, &hdr, sizeof(hdr));
+	err = crypto_hash_update(&hp->md5_desc, &sg, sizeof(hdr));
 	return err;
 }
 EXPORT_SYMBOL(tcp_md5_hash_header);
 
 int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
-			  struct sk_buff *skb, unsigned header_len)
+			  const struct sk_buff *skb, unsigned int header_len)
 {
 	struct scatterlist sg;
 	const struct tcphdr *tp = tcp_hdr(skb);
@@ -3035,8 +3029,9 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
 
 	for (i = 0; i < shi->nr_frags; ++i) {
 		const struct skb_frag_struct *f = &shi->frags[i];
-		sg_set_page(&sg, f->page, f->size, f->page_offset);
-		if (crypto_hash_update(desc, &sg, f->size))
+		struct page *page = skb_frag_page(f);
+		sg_set_page(&sg, page, skb_frag_size(f), f->page_offset);
+		if (crypto_hash_update(desc, &sg, skb_frag_size(f)))
 			return 1;
 	}
 
@@ -3048,7 +3043,7 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
 }
 EXPORT_SYMBOL(tcp_md5_hash_skb_data);
 
-int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, struct tcp_md5sig_key *key)
+int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key)
 {
 	struct scatterlist sg;
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d73aab3fbfc..52b5c2d0ecd 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -206,7 +206,7 @@ static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp)
 		tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
 }
 
-static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb)
+static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, const struct sk_buff *skb)
 {
 	if (tcp_hdr(skb)->cwr)
 		tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
@@ -217,32 +217,41 @@ static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp)
 	tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
 }
 
-static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb)
+static inline void TCP_ECN_check_ce(struct tcp_sock *tp, const struct sk_buff *skb)
 {
-	if (tp->ecn_flags & TCP_ECN_OK) {
-		if (INET_ECN_is_ce(TCP_SKB_CB(skb)->flags))
-			tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
+	if (!(tp->ecn_flags & TCP_ECN_OK))
+		return;
+
+	switch (TCP_SKB_CB(skb)->ip_dsfield & INET_ECN_MASK) {
+	case INET_ECN_NOT_ECT:
 		/* Funny extension: if ECT is not set on a segment,
-		 * it is surely retransmit. It is not in ECN RFC,
-		 * but Linux follows this rule. */
-		else if (INET_ECN_is_not_ect((TCP_SKB_CB(skb)->flags)))
+		 * and we already seen ECT on a previous segment,
+		 * it is probably a retransmit.
+		 */
+		if (tp->ecn_flags & TCP_ECN_SEEN)
 			tcp_enter_quickack_mode((struct sock *)tp);
+		break;
+	case INET_ECN_CE:
+		tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
+		/* fallinto */
+	default:
+		tp->ecn_flags |= TCP_ECN_SEEN;
 	}
 }
 
-static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th)
+static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th)
 {
 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))
 		tp->ecn_flags &= ~TCP_ECN_OK;
 }
 
-static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th)
+static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th)
 {
 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))
 		tp->ecn_flags &= ~TCP_ECN_OK;
 }
 
-static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th)
+static inline int TCP_ECN_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th)
 {
 	if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))
 		return 1;
@@ -256,14 +265,11 @@ static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th)
 
 static void tcp_fixup_sndbuf(struct sock *sk)
 {
-	int sndmem = tcp_sk(sk)->rx_opt.mss_clamp + MAX_TCP_HEADER + 16 +
-		     sizeof(struct sk_buff);
+	int sndmem = SKB_TRUESIZE(tcp_sk(sk)->rx_opt.mss_clamp + MAX_TCP_HEADER);
 
-	if (sk->sk_sndbuf < 3 * sndmem) {
-		sk->sk_sndbuf = 3 * sndmem;
-		if (sk->sk_sndbuf > sysctl_tcp_wmem[2])
-			sk->sk_sndbuf = sysctl_tcp_wmem[2];
-	}
+	sndmem *= TCP_INIT_CWND;
+	if (sk->sk_sndbuf < sndmem)
+		sk->sk_sndbuf = min(sndmem, sysctl_tcp_wmem[2]);
 }
 
 /* 2. Tuning advertised window (window_clamp, rcv_ssthresh)
@@ -309,7 +315,7 @@ static int __tcp_grow_window(const struct sock *sk, const struct sk_buff *skb)
 	return 0;
 }
 
-static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
+static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -339,17 +345,24 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
 
 static void tcp_fixup_rcvbuf(struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-	int rcvmem = tp->advmss + MAX_TCP_HEADER + 16 + sizeof(struct sk_buff);
+	u32 mss = tcp_sk(sk)->advmss;
+	u32 icwnd = TCP_DEFAULT_INIT_RCVWND;
+	int rcvmem;
 
-	/* Try to select rcvbuf so that 4 mss-sized segments
-	 * will fit to window and corresponding skbs will fit to our rcvbuf.
-	 * (was 3; 4 is minimum to allow fast retransmit to work.)
+	/* Limit to 10 segments if mss <= 1460,
+	 * or 14600/mss segments, with a minimum of two segments.
 	 */
-	while (tcp_win_from_space(rcvmem) < tp->advmss)
+	if (mss > 1460)
+		icwnd = max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
+
+	rcvmem = SKB_TRUESIZE(mss + MAX_TCP_HEADER);
+	while (tcp_win_from_space(rcvmem) < mss)
 		rcvmem += 128;
-	if (sk->sk_rcvbuf < 4 * rcvmem)
-		sk->sk_rcvbuf = min(4 * rcvmem, sysctl_tcp_rmem[2]);
+
+	rcvmem *= icwnd;
+
+	if (sk->sk_rcvbuf < rcvmem)
+		sk->sk_rcvbuf = min(rcvmem, sysctl_tcp_rmem[2]);
 }
 
 /* 4. Try to fixup all. It is made immediately after connection enters
@@ -416,7 +429,7 @@ static void tcp_clamp_window(struct sock *sk)
  */
 void tcp_initialize_rcv_mss(struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	unsigned int hint = min_t(unsigned int, tp->advmss, tp->mss_cache);
 
 	hint = min(hint, tp->rcv_wnd / 2);
@@ -531,8 +544,7 @@ void tcp_rcv_space_adjust(struct sock *sk)
 			space /= tp->advmss;
 			if (!space)
 				space = 1;
-			rcvmem = (tp->advmss + MAX_TCP_HEADER +
-				  16 + sizeof(struct sk_buff));
+			rcvmem = SKB_TRUESIZE(tp->advmss + MAX_TCP_HEADER);
 			while (tcp_win_from_space(rcvmem) < tp->advmss)
 				rcvmem += 128;
 			space *= rcvmem;
@@ -812,7 +824,7 @@ void tcp_update_metrics(struct sock *sk)
 	}
 }
 
-__u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst)
+__u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst)
 {
 	__u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0);
 
@@ -1204,7 +1216,7 @@ static void tcp_mark_lost_retrans(struct sock *sk)
 		tp->lost_retrans_low = new_low_seq;
 }
 
-static int tcp_check_dsack(struct sock *sk, struct sk_buff *ack_skb,
+static int tcp_check_dsack(struct sock *sk, const struct sk_buff *ack_skb,
 			   struct tcp_sack_block_wire *sp, int num_sacks,
 			   u32 prior_snd_una)
 {
@@ -1298,7 +1310,7 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb,
 	return in_sack;
 }
 
-static u8 tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
+static u8 tcp_sacktag_one(const struct sk_buff *skb, struct sock *sk,
 			  struct tcp_sacktag_state *state,
 			  int dup_sack, int pcount)
 {
@@ -1438,7 +1450,7 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
 		tp->lost_cnt_hint -= tcp_skb_pcount(prev);
 	}
 
-	TCP_SKB_CB(skb)->flags |= TCP_SKB_CB(prev)->flags;
+	TCP_SKB_CB(skb)->tcp_flags |= TCP_SKB_CB(prev)->tcp_flags;
 	if (skb == tcp_highest_sack(sk))
 		tcp_advance_highest_sack(sk, skb);
 
@@ -1453,13 +1465,13 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
 /* I wish gso_size would have a bit more sane initialization than
  * something-or-zero which complicates things
  */
-static int tcp_skb_seglen(struct sk_buff *skb)
+static int tcp_skb_seglen(const struct sk_buff *skb)
 {
 	return tcp_skb_pcount(skb) == 1 ? skb->len : tcp_skb_mss(skb);
 }
 
 /* Shifting pages past head area doesn't work */
-static int skb_can_shift(struct sk_buff *skb)
+static int skb_can_shift(const struct sk_buff *skb)
 {
 	return !skb_headlen(skb) && skb_is_nonlinear(skb);
 }
@@ -1708,19 +1720,19 @@ static struct sk_buff *tcp_maybe_skipping_dsack(struct sk_buff *skb,
 	return skb;
 }
 
-static int tcp_sack_cache_ok(struct tcp_sock *tp, struct tcp_sack_block *cache)
+static int tcp_sack_cache_ok(const struct tcp_sock *tp, const struct tcp_sack_block *cache)
 {
 	return cache < tp->recv_sack_cache + ARRAY_SIZE(tp->recv_sack_cache);
 }
 
 static int
-tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
+tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
 			u32 prior_snd_una)
 {
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
-	unsigned char *ptr = (skb_transport_header(ack_skb) +
-			      TCP_SKB_CB(ack_skb)->sacked);
+	const unsigned char *ptr = (skb_transport_header(ack_skb) +
+				    TCP_SKB_CB(ack_skb)->sacked);
 	struct tcp_sack_block_wire *sp_wire = (struct tcp_sack_block_wire *)(ptr+2);
 	struct tcp_sack_block sp[TCP_NUM_SACKS];
 	struct tcp_sack_block *cache;
@@ -2284,7 +2296,7 @@ static int tcp_check_sack_reneging(struct sock *sk, int flag)
 	return 0;
 }
 
-static inline int tcp_fackets_out(struct tcp_sock *tp)
+static inline int tcp_fackets_out(const struct tcp_sock *tp)
 {
 	return tcp_is_reno(tp) ? tp->sacked_out + 1 : tp->fackets_out;
 }
@@ -2304,19 +2316,20 @@ static inline int tcp_fackets_out(struct tcp_sock *tp)
  * they differ. Since neither occurs due to loss, TCP should really
  * ignore them.
  */
-static inline int tcp_dupack_heuristics(struct tcp_sock *tp)
+static inline int tcp_dupack_heuristics(const struct tcp_sock *tp)
 {
 	return tcp_is_fack(tp) ? tp->fackets_out : tp->sacked_out + 1;
 }
 
-static inline int tcp_skb_timedout(struct sock *sk, struct sk_buff *skb)
+static inline int tcp_skb_timedout(const struct sock *sk,
+				   const struct sk_buff *skb)
 {
 	return tcp_time_stamp - TCP_SKB_CB(skb)->when > inet_csk(sk)->icsk_rto;
 }
 
-static inline int tcp_head_timedout(struct sock *sk)
+static inline int tcp_head_timedout(const struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	return tp->packets_out &&
 	       tcp_skb_timedout(sk, tcp_write_queue_head(sk));
@@ -2627,7 +2640,7 @@ static void tcp_cwnd_down(struct sock *sk, int flag)
 /* Nothing was retransmitted or returned timestamp is less
  * than timestamp of the first retransmission.
  */
-static inline int tcp_packet_delayed(struct tcp_sock *tp)
+static inline int tcp_packet_delayed(const struct tcp_sock *tp)
 {
 	return !tp->retrans_stamp ||
 		(tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr &&
@@ -2688,7 +2701,7 @@ static void tcp_undo_cwr(struct sock *sk, const bool undo_ssthresh)
 	tp->snd_cwnd_stamp = tcp_time_stamp;
 }
 
-static inline int tcp_may_undo(struct tcp_sock *tp)
+static inline int tcp_may_undo(const struct tcp_sock *tp)
 {
 	return tp->undo_marker && (!tp->undo_retrans || tcp_packet_delayed(tp));
 }
@@ -2752,9 +2765,9 @@ static void tcp_try_undo_dsack(struct sock *sk)
  * that successive retransmissions of a segment must not advance
  * retrans_stamp under any conditions.
  */
-static int tcp_any_retrans_done(struct sock *sk)
+static int tcp_any_retrans_done(const struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
 
 	if (tp->retrans_out)
@@ -2828,9 +2841,13 @@ static int tcp_try_undo_loss(struct sock *sk)
 static inline void tcp_complete_cwr(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	/* Do not moderate cwnd if it's already undone in cwr or recovery */
-	if (tp->undo_marker && tp->snd_cwnd > tp->snd_ssthresh) {
-		tp->snd_cwnd = tp->snd_ssthresh;
+
+	/* Do not moderate cwnd if it's already undone in cwr or recovery. */
+	if (tp->undo_marker) {
+		if (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR)
+			tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
+		else /* PRR */
+			tp->snd_cwnd = tp->snd_ssthresh;
 		tp->snd_cwnd_stamp = tcp_time_stamp;
 	}
 	tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR);
@@ -2948,6 +2965,38 @@ void tcp_simple_retransmit(struct sock *sk)
 }
 EXPORT_SYMBOL(tcp_simple_retransmit);
 
+/* This function implements the PRR algorithm, specifcally the PRR-SSRB
+ * (proportional rate reduction with slow start reduction bound) as described in
+ * http://www.ietf.org/id/draft-mathis-tcpm-proportional-rate-reduction-01.txt.
+ * It computes the number of packets to send (sndcnt) based on packets newly
+ * delivered:
+ *   1) If the packets in flight is larger than ssthresh, PRR spreads the
+ *	cwnd reductions across a full RTT.
+ *   2) If packets in flight is lower than ssthresh (such as due to excess
+ *	losses and/or application stalls), do not perform any further cwnd
+ *	reductions, but instead slow start up to ssthresh.
+ */
+static void tcp_update_cwnd_in_recovery(struct sock *sk, int newly_acked_sacked,
+					int fast_rexmit, int flag)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+	int sndcnt = 0;
+	int delta = tp->snd_ssthresh - tcp_packets_in_flight(tp);
+
+	if (tcp_packets_in_flight(tp) > tp->snd_ssthresh) {
+		u64 dividend = (u64)tp->snd_ssthresh * tp->prr_delivered +
+			       tp->prior_cwnd - 1;
+		sndcnt = div_u64(dividend, tp->prior_cwnd) - tp->prr_out;
+	} else {
+		sndcnt = min_t(int, delta,
+			       max_t(int, tp->prr_delivered - tp->prr_out,
+				     newly_acked_sacked) + 1);
+	}
+
+	sndcnt = max(sndcnt, (fast_rexmit ? 1 : 0));
+	tp->snd_cwnd = tcp_packets_in_flight(tp) + sndcnt;
+}
+
 /* Process an event, which can update packets-in-flight not trivially.
  * Main goal of this function is to calculate new estimate for left_out,
  * taking into account both packets sitting in receiver's buffer and
@@ -2959,7 +3008,8 @@ EXPORT_SYMBOL(tcp_simple_retransmit);
  * It does _not_ decide what to send, it is made in function
  * tcp_xmit_retransmit_queue().
  */
-static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
+static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
+				  int newly_acked_sacked, int flag)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -3109,13 +3159,17 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag)
 
 		tp->bytes_acked = 0;
 		tp->snd_cwnd_cnt = 0;
+		tp->prior_cwnd = tp->snd_cwnd;
+		tp->prr_delivered = 0;
+		tp->prr_out = 0;
 		tcp_set_ca_state(sk, TCP_CA_Recovery);
 		fast_rexmit = 1;
 	}
 
 	if (do_lost || (tcp_is_fack(tp) && tcp_head_timedout(sk)))
 		tcp_update_scoreboard(sk, fast_rexmit);
-	tcp_cwnd_down(sk, flag);
+	tp->prr_delivered += newly_acked_sacked;
+	tcp_update_cwnd_in_recovery(sk, newly_acked_sacked, fast_rexmit, flag);
 	tcp_xmit_retransmit_queue(sk);
 }
 
@@ -3192,7 +3246,7 @@ static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
  */
 static void tcp_rearm_rto(struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	if (!tp->packets_out) {
 		inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
@@ -3296,7 +3350,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
 		 * connection startup slow start one packet too
 		 * quickly.  This is severely frowned upon behavior.
 		 */
-		if (!(scb->flags & TCPHDR_SYN)) {
+		if (!(scb->tcp_flags & TCPHDR_SYN)) {
 			flag |= FLAG_DATA_ACKED;
 		} else {
 			flag |= FLAG_SYN_ACKED;
@@ -3444,7 +3498,7 @@ static inline int tcp_may_update_window(const struct tcp_sock *tp,
  * Window update algorithm, described in RFC793/RFC1122 (used in linux-2.2
  * and in FreeBSD. NetBSD's one is even worse.) is wrong.
  */
-static int tcp_ack_update_window(struct sock *sk, struct sk_buff *skb, u32 ack,
+static int tcp_ack_update_window(struct sock *sk, const struct sk_buff *skb, u32 ack,
 				 u32 ack_seq)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -3620,7 +3674,7 @@ static int tcp_process_frto(struct sock *sk, int flag)
 }
 
 /* This routine deals with incoming acks, but not outgoing ones. */
-static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
+static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -3630,6 +3684,8 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
 	u32 prior_in_flight;
 	u32 prior_fackets;
 	int prior_packets;
+	int prior_sacked = tp->sacked_out;
+	int newly_acked_sacked = 0;
 	int frto_cwnd = 0;
 
 	/* If the ack is older than previous acks
@@ -3701,6 +3757,9 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
 	/* See if we can take anything off of the retransmit queue. */
 	flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una);
 
+	newly_acked_sacked = (prior_packets - prior_sacked) -
+			     (tp->packets_out - tp->sacked_out);
+
 	if (tp->frto_counter)
 		frto_cwnd = tcp_process_frto(sk, flag);
 	/* Guarantee sacktag reordering detection against wrap-arounds */
@@ -3713,7 +3772,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
 		    tcp_may_raise_cwnd(sk, flag))
 			tcp_cong_avoid(sk, ack, prior_in_flight);
 		tcp_fastretrans_alert(sk, prior_packets - tp->packets_out,
-				      flag);
+				      newly_acked_sacked, flag);
 	} else {
 		if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
 			tcp_cong_avoid(sk, ack, prior_in_flight);
@@ -3752,14 +3811,14 @@ old_ack:
  * But, this can also be called on packets in the established flow when
  * the fast version below fails.
  */
-void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
-		       u8 **hvpp, int estab)
+void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *opt_rx,
+		       const u8 **hvpp, int estab)
 {
-	unsigned char *ptr;
-	struct tcphdr *th = tcp_hdr(skb);
+	const unsigned char *ptr;
+	const struct tcphdr *th = tcp_hdr(skb);
 	int length = (th->doff * 4) - sizeof(struct tcphdr);
 
-	ptr = (unsigned char *)(th + 1);
+	ptr = (const unsigned char *)(th + 1);
 	opt_rx->saw_tstamp = 0;
 
 	while (length > 0) {
@@ -3870,9 +3929,9 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
 }
 EXPORT_SYMBOL(tcp_parse_options);
 
-static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, struct tcphdr *th)
+static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr *th)
 {
-	__be32 *ptr = (__be32 *)(th + 1);
+	const __be32 *ptr = (const __be32 *)(th + 1);
 
 	if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
 			  | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
@@ -3889,8 +3948,9 @@ static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, struct tcphdr *th)
 /* Fast parse options. This hopes to only see timestamps.
  * If it is wrong it falls back on tcp_parse_options().
  */
-static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
-				  struct tcp_sock *tp, u8 **hvpp)
+static int tcp_fast_parse_options(const struct sk_buff *skb,
+				  const struct tcphdr *th,
+				  struct tcp_sock *tp, const u8 **hvpp)
 {
 	/* In the spirit of fast parsing, compare doff directly to constant
 	 * values.  Because equality is used, short doff can be ignored here.
@@ -3911,10 +3971,10 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
 /*
  * Parse MD5 Signature option
  */
-u8 *tcp_parse_md5sig_option(struct tcphdr *th)
+const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
 {
-	int length = (th->doff << 2) - sizeof (*th);
-	u8 *ptr = (u8*)(th + 1);
+	int length = (th->doff << 2) - sizeof(*th);
+	const u8 *ptr = (const u8 *)(th + 1);
 
 	/* If the TCP option is too short, we can short cut */
 	if (length < TCPOLEN_MD5SIG)
@@ -3991,8 +4051,8 @@ static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
 
 static int tcp_disordered_ack(const struct sock *sk, const struct sk_buff *skb)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcphdr *th = tcp_hdr(skb);
 	u32 seq = TCP_SKB_CB(skb)->seq;
 	u32 ack = TCP_SKB_CB(skb)->ack_seq;
 
@@ -4031,7 +4091,7 @@ static inline int tcp_paws_discard(const struct sock *sk,
  * (borrowed from freebsd)
  */
 
-static inline int tcp_sequence(struct tcp_sock *tp, u32 seq, u32 end_seq)
+static inline int tcp_sequence(const struct tcp_sock *tp, u32 seq, u32 end_seq)
 {
 	return	!before(end_seq, tp->rcv_wup) &&
 		!after(seq, tp->rcv_nxt + tcp_receive_window(tp));
@@ -4076,7 +4136,7 @@ static void tcp_reset(struct sock *sk)
  *
  *	If we are in FINWAIT-2, a received FIN moves us to TIME-WAIT.
  */
-static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th)
+static void tcp_fin(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -4188,7 +4248,7 @@ static void tcp_dsack_extend(struct sock *sk, u32 seq, u32 end_seq)
 		tcp_sack_extend(tp->duplicate_sack, seq, end_seq);
 }
 
-static void tcp_send_dupack(struct sock *sk, struct sk_buff *skb)
+static void tcp_send_dupack(struct sock *sk, const struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -4347,7 +4407,7 @@ static void tcp_ofo_queue(struct sock *sk)
 		__skb_queue_tail(&sk->sk_receive_queue, skb);
 		tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
 		if (tcp_hdr(skb)->fin)
-			tcp_fin(skb, sk, tcp_hdr(skb));
+			tcp_fin(sk);
 	}
 }
 
@@ -4375,7 +4435,7 @@ static inline int tcp_try_rmem_schedule(struct sock *sk, unsigned int size)
 
 static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	struct tcp_sock *tp = tcp_sk(sk);
 	int eaten = -1;
 
@@ -4429,7 +4489,7 @@ queue_and_out:
 		if (skb->len)
 			tcp_event_data_recv(sk, skb);
 		if (th->fin)
-			tcp_fin(skb, sk, th);
+			tcp_fin(sk);
 
 		if (!skb_queue_empty(&tp->out_of_order_queue)) {
 			tcp_ofo_queue(sk);
@@ -4859,9 +4919,9 @@ void tcp_cwnd_application_limited(struct sock *sk)
 	tp->snd_cwnd_stamp = tcp_time_stamp;
 }
 
-static int tcp_should_expand_sndbuf(struct sock *sk)
+static int tcp_should_expand_sndbuf(const struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	/* If the user specified a specific send buffer setting, do
 	 * not modify it.
@@ -4895,8 +4955,10 @@ static void tcp_new_space(struct sock *sk)
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	if (tcp_should_expand_sndbuf(sk)) {
-		int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache) +
-			MAX_TCP_HEADER + 16 + sizeof(struct sk_buff);
+		int sndmem = SKB_TRUESIZE(max_t(u32,
+						tp->rx_opt.mss_clamp,
+						tp->mss_cache) +
+					  MAX_TCP_HEADER);
 		int demanded = max_t(unsigned int, tp->snd_cwnd,
 				     tp->reordering + 1);
 		sndmem *= 2 * demanded;
@@ -4968,7 +5030,7 @@ static inline void tcp_ack_snd_check(struct sock *sk)
  *	either form (or just set the sysctl tcp_stdurg).
  */
 
-static void tcp_check_urg(struct sock *sk, struct tcphdr *th)
+static void tcp_check_urg(struct sock *sk, const struct tcphdr *th)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	u32 ptr = ntohs(th->urg_ptr);
@@ -5034,7 +5096,7 @@ static void tcp_check_urg(struct sock *sk, struct tcphdr *th)
 }
 
 /* This is the 'fast' part of urgent handling. */
-static void tcp_urg(struct sock *sk, struct sk_buff *skb, struct tcphdr *th)
+static void tcp_urg(struct sock *sk, struct sk_buff *skb, const struct tcphdr *th)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -5155,9 +5217,9 @@ out:
  * play significant role here.
  */
 static int tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
-			      struct tcphdr *th, int syn_inerr)
+			      const struct tcphdr *th, int syn_inerr)
 {
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	/* RFC1323: H1. Apply PAWS check first. */
@@ -5238,7 +5300,7 @@ discard:
  *	tcp_data_queue when everything is OK.
  */
 int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
-			struct tcphdr *th, unsigned len)
+			const struct tcphdr *th, unsigned int len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	int res;
@@ -5449,9 +5511,9 @@ discard:
 EXPORT_SYMBOL(tcp_rcv_established);
 
 static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
-					 struct tcphdr *th, unsigned len)
+					 const struct tcphdr *th, unsigned int len)
 {
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_cookie_values *cvp = tp->cookie_values;
@@ -5726,7 +5788,7 @@ reset_and_undo:
  */
 
 int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
-			  struct tcphdr *th, unsigned len)
+			  const struct tcphdr *th, unsigned int len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7963e03f106..0ea10eefa60 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -92,7 +92,7 @@ EXPORT_SYMBOL(sysctl_tcp_low_latency);
 static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk,
 						   __be32 addr);
 static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
-			       __be32 daddr, __be32 saddr, struct tcphdr *th);
+			       __be32 daddr, __be32 saddr, const struct tcphdr *th);
 #else
 static inline
 struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr)
@@ -104,7 +104,7 @@ struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr)
 struct inet_hashinfo tcp_hashinfo;
 EXPORT_SYMBOL(tcp_hashinfo);
 
-static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb)
+static inline __u32 tcp_v4_init_sequence(const struct sk_buff *skb)
 {
 	return secure_tcp_sequence_number(ip_hdr(skb)->daddr,
 					  ip_hdr(skb)->saddr,
@@ -552,7 +552,7 @@ static void __tcp_v4_send_check(struct sk_buff *skb,
 /* This routine computes an IPv4 TCP checksum. */
 void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb)
 {
-	struct inet_sock *inet = inet_sk(sk);
+	const struct inet_sock *inet = inet_sk(sk);
 
 	__tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr);
 }
@@ -590,7 +590,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
 
 static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	struct {
 		struct tcphdr th;
 #ifdef CONFIG_TCP_MD5SIG
@@ -652,6 +652,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 	arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0;
 
 	net = dev_net(skb_dst(skb)->dev);
+	arg.tos = ip_hdr(skb)->tos;
 	ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
 		      &arg, arg.iov[0].iov_len);
 
@@ -666,9 +667,9 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
 			    u32 win, u32 ts, int oif,
 			    struct tcp_md5sig_key *key,
-			    int reply_flags)
+			    int reply_flags, u8 tos)
 {
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	struct {
 		struct tcphdr th;
 		__be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2)
@@ -726,7 +727,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
 	arg.csumoffset = offsetof(struct tcphdr, check) / 2;
 	if (oif)
 		arg.bound_dev_if = oif;
-
+	arg.tos = tos;
 	ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
 		      &arg, arg.iov[0].iov_len);
 
@@ -743,7 +744,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
 			tcptw->tw_ts_recent,
 			tw->tw_bound_dev_if,
 			tcp_twsk_md5_key(tcptw),
-			tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0
+			tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0,
+			tw->tw_tos
 			);
 
 	inet_twsk_put(tw);
@@ -757,7 +759,8 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
 			req->ts_recent,
 			0,
 			tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr),
-			inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0);
+			inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
+			ip_hdr(skb)->tos);
 }
 
 /*
@@ -1090,7 +1093,7 @@ static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
 }
 
 static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
-			       __be32 daddr, __be32 saddr, struct tcphdr *th)
+			       __be32 daddr, __be32 saddr, const struct tcphdr *th)
 {
 	struct tcp_md5sig_pool *hp;
 	struct hash_desc *desc;
@@ -1122,12 +1125,12 @@ clear_hash_noput:
 }
 
 int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
-			struct sock *sk, struct request_sock *req,
-			struct sk_buff *skb)
+			const struct sock *sk, const struct request_sock *req,
+			const struct sk_buff *skb)
 {
 	struct tcp_md5sig_pool *hp;
 	struct hash_desc *desc;
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	__be32 saddr, daddr;
 
 	if (sk) {
@@ -1172,7 +1175,7 @@ clear_hash_noput:
 }
 EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
 
-static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
+static int tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 {
 	/*
 	 * This gets called for each TCP segment that arrives
@@ -1182,10 +1185,10 @@ static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
 	 * o MD5 hash and we're not expecting one.
 	 * o MD5 hash and its wrong.
 	 */
-	__u8 *hash_location = NULL;
+	const __u8 *hash_location = NULL;
 	struct tcp_md5sig_key *hash_expected;
 	const struct iphdr *iph = ip_hdr(skb);
-	struct tcphdr *th = tcp_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	int genhash;
 	unsigned char newhash[16];
 
@@ -1248,7 +1251,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_extend_values tmp_ext;
 	struct tcp_options_received tmp_opt;
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct request_sock *req;
 	struct inet_request_sock *ireq;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -1588,7 +1591,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 #endif
 
 	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
-		sock_rps_save_rxhash(sk, skb->rxhash);
+		sock_rps_save_rxhash(sk, skb);
 		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
 			rsk = sk;
 			goto reset;
@@ -1605,7 +1608,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 			goto discard;
 
 		if (nsk != sk) {
-			sock_rps_save_rxhash(nsk, skb->rxhash);
+			sock_rps_save_rxhash(nsk, skb);
 			if (tcp_child_process(sk, nsk, skb)) {
 				rsk = nsk;
 				goto reset;
@@ -1613,7 +1616,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 			return 0;
 		}
 	} else
-		sock_rps_save_rxhash(sk, skb->rxhash);
+		sock_rps_save_rxhash(sk, skb);
 
 	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) {
 		rsk = sk;
@@ -1645,7 +1648,7 @@ EXPORT_SYMBOL(tcp_v4_do_rcv);
 int tcp_v4_rcv(struct sk_buff *skb)
 {
 	const struct iphdr *iph;
-	struct tcphdr *th;
+	const struct tcphdr *th;
 	struct sock *sk;
 	int ret;
 	struct net *net = dev_net(skb->dev);
@@ -1680,7 +1683,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 				    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	 = iph->tos;
+	TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph);
 	TCP_SKB_CB(skb)->sacked	 = 0;
 
 	sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
@@ -1809,7 +1812,7 @@ EXPORT_SYMBOL(tcp_v4_get_peer);
 
 void *tcp_v4_tw_get_peer(struct sock *sk)
 {
-	struct inet_timewait_sock *tw = inet_twsk(sk);
+	const struct inet_timewait_sock *tw = inet_twsk(sk);
 
 	return inet_getpeer_v4(tw->tw_daddr, 1);
 }
@@ -2381,7 +2384,7 @@ void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo)
 }
 EXPORT_SYMBOL(tcp_proc_unregister);
 
-static void get_openreq4(struct sock *sk, struct request_sock *req,
+static void get_openreq4(const struct sock *sk, const struct request_sock *req,
 			 struct seq_file *f, int i, int uid, int *len)
 {
 	const struct inet_request_sock *ireq = inet_rsk(req);
@@ -2411,9 +2414,9 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len)
 {
 	int timer_active;
 	unsigned long timer_expires;
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	const struct inet_connection_sock *icsk = inet_csk(sk);
-	struct inet_sock *inet = inet_sk(sk);
+	const struct inet_sock *inet = inet_sk(sk);
 	__be32 dest = inet->inet_daddr;
 	__be32 src = inet->inet_rcv_saddr;
 	__u16 destp = ntohs(inet->inet_dport);
@@ -2462,7 +2465,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len)
 		len);
 }
 
-static void get_timewait4_sock(struct inet_timewait_sock *tw,
+static void get_timewait4_sock(const struct inet_timewait_sock *tw,
 			       struct seq_file *f, int i, int *len)
 {
 	__be32 dest, src;
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 0ce3d06dce6..85a2fbebd7e 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -141,7 +141,7 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
 			   const struct tcphdr *th)
 {
 	struct tcp_options_received tmp_opt;
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
 	int paws_reject = 0;
 
@@ -567,7 +567,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 			   struct request_sock **prev)
 {
 	struct tcp_options_received tmp_opt;
-	u8 *hash_location;
+	const u8 *hash_location;
 	struct sock *child;
 	const struct tcphdr *th = tcp_hdr(skb);
 	__be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 882e0b0964d..980b98f6288 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -65,7 +65,7 @@ EXPORT_SYMBOL_GPL(sysctl_tcp_cookie_size);
 
 
 /* Account for new data that has been sent to the network. */
-static void tcp_event_new_data_sent(struct sock *sk, struct sk_buff *skb)
+static void tcp_event_new_data_sent(struct sock *sk, const struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	unsigned int prior_packets = tp->packets_out;
@@ -89,9 +89,9 @@ static void tcp_event_new_data_sent(struct sock *sk, struct sk_buff *skb)
  * Anything in between SND.UNA...SND.UNA+SND.WND also can be already
  * invalid. OK, let's make this for now:
  */
-static inline __u32 tcp_acceptable_seq(struct sock *sk)
+static inline __u32 tcp_acceptable_seq(const struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	if (!before(tcp_wnd_end(tp), tp->snd_nxt))
 		return tp->snd_nxt;
@@ -116,7 +116,7 @@ static inline __u32 tcp_acceptable_seq(struct sock *sk)
 static __u16 tcp_advertise_mss(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct dst_entry *dst = __sk_dst_get(sk);
+	const struct dst_entry *dst = __sk_dst_get(sk);
 	int mss = tp->advmss;
 
 	if (dst) {
@@ -133,7 +133,7 @@ static __u16 tcp_advertise_mss(struct sock *sk)
 
 /* RFC2861. Reset CWND after idle period longer RTO to "restart window".
  * This is the first part of cwnd validation mechanism. */
-static void tcp_cwnd_restart(struct sock *sk, struct dst_entry *dst)
+static void tcp_cwnd_restart(struct sock *sk, const struct dst_entry *dst)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	s32 delta = tcp_time_stamp - tp->lsndtime;
@@ -154,7 +154,7 @@ static void tcp_cwnd_restart(struct sock *sk, struct dst_entry *dst)
 
 /* Congestion state accounting after a packet has been sent. */
 static void tcp_event_data_sent(struct tcp_sock *tp,
-				struct sk_buff *skb, struct sock *sk)
+				struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	const u32 now = tcp_time_stamp;
@@ -295,11 +295,11 @@ static u16 tcp_select_window(struct sock *sk)
 }
 
 /* Packet ECN state for a SYN-ACK */
-static inline void TCP_ECN_send_synack(struct tcp_sock *tp, struct sk_buff *skb)
+static inline void TCP_ECN_send_synack(const struct tcp_sock *tp, struct sk_buff *skb)
 {
-	TCP_SKB_CB(skb)->flags &= ~TCPHDR_CWR;
+	TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_CWR;
 	if (!(tp->ecn_flags & TCP_ECN_OK))
-		TCP_SKB_CB(skb)->flags &= ~TCPHDR_ECE;
+		TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_ECE;
 }
 
 /* Packet ECN state for a SYN.  */
@@ -309,13 +309,13 @@ static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
 
 	tp->ecn_flags = 0;
 	if (sysctl_tcp_ecn == 1) {
-		TCP_SKB_CB(skb)->flags |= TCPHDR_ECE | TCPHDR_CWR;
+		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR;
 		tp->ecn_flags = TCP_ECN_OK;
 	}
 }
 
 static __inline__ void
-TCP_ECN_make_synack(struct request_sock *req, struct tcphdr *th)
+TCP_ECN_make_synack(const struct request_sock *req, struct tcphdr *th)
 {
 	if (inet_rsk(req)->ecn_ok)
 		th->ece = 1;
@@ -356,7 +356,7 @@ static void tcp_init_nondata_skb(struct sk_buff *skb, u32 seq, u8 flags)
 	skb->ip_summed = CHECKSUM_PARTIAL;
 	skb->csum = 0;
 
-	TCP_SKB_CB(skb)->flags = flags;
+	TCP_SKB_CB(skb)->tcp_flags = flags;
 	TCP_SKB_CB(skb)->sacked = 0;
 
 	skb_shinfo(skb)->gso_segs = 1;
@@ -565,7 +565,8 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
  */
 static unsigned tcp_syn_options(struct sock *sk, struct sk_buff *skb,
 				struct tcp_out_options *opts,
-				struct tcp_md5sig_key **md5) {
+				struct tcp_md5sig_key **md5)
+{
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_cookie_values *cvp = tp->cookie_values;
 	unsigned remaining = MAX_TCP_OPTION_SPACE;
@@ -743,7 +744,8 @@ static unsigned tcp_synack_options(struct sock *sk,
  */
 static unsigned tcp_established_options(struct sock *sk, struct sk_buff *skb,
 					struct tcp_out_options *opts,
-					struct tcp_md5sig_key **md5) {
+					struct tcp_md5sig_key **md5)
+{
 	struct tcp_skb_cb *tcb = skb ? TCP_SKB_CB(skb) : NULL;
 	struct tcp_sock *tp = tcp_sk(sk);
 	unsigned size = 0;
@@ -826,7 +828,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 	tcb = TCP_SKB_CB(skb);
 	memset(&opts, 0, sizeof(opts));
 
-	if (unlikely(tcb->flags & TCPHDR_SYN))
+	if (unlikely(tcb->tcp_flags & TCPHDR_SYN))
 		tcp_options_size = tcp_syn_options(sk, skb, &opts, &md5);
 	else
 		tcp_options_size = tcp_established_options(sk, skb, &opts,
@@ -850,9 +852,9 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 	th->seq			= htonl(tcb->seq);
 	th->ack_seq		= htonl(tp->rcv_nxt);
 	*(((__be16 *)th) + 6)	= htons(((tcp_header_size >> 2) << 12) |
-					tcb->flags);
+					tcb->tcp_flags);
 
-	if (unlikely(tcb->flags & TCPHDR_SYN)) {
+	if (unlikely(tcb->tcp_flags & TCPHDR_SYN)) {
 		/* RFC1323: The window in SYN & SYN/ACK segments
 		 * is never scaled.
 		 */
@@ -875,7 +877,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 	}
 
 	tcp_options_write((__be32 *)(th + 1), tp, &opts);
-	if (likely((tcb->flags & TCPHDR_SYN) == 0))
+	if (likely((tcb->tcp_flags & TCPHDR_SYN) == 0))
 		TCP_ECN_send(sk, skb, tcp_header_size);
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -889,11 +891,11 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
 	icsk->icsk_af_ops->send_check(sk, skb);
 
-	if (likely(tcb->flags & TCPHDR_ACK))
+	if (likely(tcb->tcp_flags & TCPHDR_ACK))
 		tcp_event_ack_sent(sk, tcp_skb_pcount(skb));
 
 	if (skb->len != tcp_header_size)
-		tcp_event_data_sent(tp, skb, sk);
+		tcp_event_data_sent(tp, sk);
 
 	if (after(tcb->end_seq, tp->snd_nxt) || tcb->seq == tcb->end_seq)
 		TCP_ADD_STATS(sock_net(sk), TCP_MIB_OUTSEGS,
@@ -926,7 +928,7 @@ static void tcp_queue_skb(struct sock *sk, struct sk_buff *skb)
 }
 
 /* Initialize TSO segments for a packet. */
-static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb,
+static void tcp_set_skb_tso_segs(const struct sock *sk, struct sk_buff *skb,
 				 unsigned int mss_now)
 {
 	if (skb->len <= mss_now || !sk_can_gso(sk) ||
@@ -947,7 +949,7 @@ static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb,
 /* When a modification to fackets out becomes necessary, we need to check
  * skb is counted to fackets_out or not.
  */
-static void tcp_adjust_fackets_out(struct sock *sk, struct sk_buff *skb,
+static void tcp_adjust_fackets_out(struct sock *sk, const struct sk_buff *skb,
 				   int decr)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -962,7 +964,7 @@ static void tcp_adjust_fackets_out(struct sock *sk, struct sk_buff *skb,
 /* Pcount in the middle of the write queue got changed, we need to do various
  * tweaks to fix counters
  */
-static void tcp_adjust_pcount(struct sock *sk, struct sk_buff *skb, int decr)
+static void tcp_adjust_pcount(struct sock *sk, const struct sk_buff *skb, int decr)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -1032,9 +1034,9 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
 	TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq;
 
 	/* PSH and FIN should only be set in the second packet. */
-	flags = TCP_SKB_CB(skb)->flags;
-	TCP_SKB_CB(skb)->flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
-	TCP_SKB_CB(buff)->flags = flags;
+	flags = TCP_SKB_CB(skb)->tcp_flags;
+	TCP_SKB_CB(skb)->tcp_flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
+	TCP_SKB_CB(buff)->tcp_flags = flags;
 	TCP_SKB_CB(buff)->sacked = TCP_SKB_CB(skb)->sacked;
 
 	if (!skb_shinfo(skb)->nr_frags && skb->ip_summed != CHECKSUM_PARTIAL) {
@@ -1094,14 +1096,16 @@ static void __pskb_trim_head(struct sk_buff *skb, int len)
 	eat = len;
 	k = 0;
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-		if (skb_shinfo(skb)->frags[i].size <= eat) {
-			put_page(skb_shinfo(skb)->frags[i].page);
-			eat -= skb_shinfo(skb)->frags[i].size;
+		int size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
+
+		if (size <= eat) {
+			skb_frag_unref(skb, i);
+			eat -= size;
 		} else {
 			skb_shinfo(skb)->frags[k] = skb_shinfo(skb)->frags[i];
 			if (eat) {
 				skb_shinfo(skb)->frags[k].page_offset += eat;
-				skb_shinfo(skb)->frags[k].size -= eat;
+				skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat);
 				eat = 0;
 			}
 			k++;
@@ -1144,10 +1148,10 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
 }
 
 /* Calculate MSS. Not accounting for SACKs here.  */
-int tcp_mtu_to_mss(struct sock *sk, int pmtu)
+int tcp_mtu_to_mss(const struct sock *sk, int pmtu)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct inet_connection_sock *icsk = inet_csk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
+	const struct inet_connection_sock *icsk = inet_csk(sk);
 	int mss_now;
 
 	/* Calculate base mss without TCP options:
@@ -1173,10 +1177,10 @@ int tcp_mtu_to_mss(struct sock *sk, int pmtu)
 }
 
 /* Inverse of above */
-int tcp_mss_to_mtu(struct sock *sk, int mss)
+int tcp_mss_to_mtu(const struct sock *sk, int mss)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct inet_connection_sock *icsk = inet_csk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
+	const struct inet_connection_sock *icsk = inet_csk(sk);
 	int mtu;
 
 	mtu = mss +
@@ -1250,8 +1254,8 @@ EXPORT_SYMBOL(tcp_sync_mss);
  */
 unsigned int tcp_current_mss(struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct dst_entry *dst = __sk_dst_get(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
+	const struct dst_entry *dst = __sk_dst_get(sk);
 	u32 mss_now;
 	unsigned header_len;
 	struct tcp_out_options opts;
@@ -1311,10 +1315,10 @@ static void tcp_cwnd_validate(struct sock *sk)
  * modulo only when the receiver window alone is the limiting factor or
  * when we would be allowed to send the split-due-to-Nagle skb fully.
  */
-static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb,
+static unsigned int tcp_mss_split_point(const struct sock *sk, const struct sk_buff *skb,
 					unsigned int mss_now, unsigned int cwnd)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	u32 needed, window, cwnd_len;
 
 	window = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq;
@@ -1334,13 +1338,14 @@ static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb,
 /* Can at least one segment of SKB be sent right now, according to the
  * congestion window rules?  If so, return how many segments are allowed.
  */
-static inline unsigned int tcp_cwnd_test(struct tcp_sock *tp,
-					 struct sk_buff *skb)
+static inline unsigned int tcp_cwnd_test(const struct tcp_sock *tp,
+					 const struct sk_buff *skb)
 {
 	u32 in_flight, cwnd;
 
 	/* Don't be strict about the congestion window for the final FIN.  */
-	if ((TCP_SKB_CB(skb)->flags & TCPHDR_FIN) && tcp_skb_pcount(skb) == 1)
+	if ((TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) &&
+	    tcp_skb_pcount(skb) == 1)
 		return 1;
 
 	in_flight = tcp_packets_in_flight(tp);
@@ -1355,7 +1360,7 @@ static inline unsigned int tcp_cwnd_test(struct tcp_sock *tp,
  * This must be invoked the first time we consider transmitting
  * SKB onto the wire.
  */
-static int tcp_init_tso_segs(struct sock *sk, struct sk_buff *skb,
+static int tcp_init_tso_segs(const struct sock *sk, struct sk_buff *skb,
 			     unsigned int mss_now)
 {
 	int tso_segs = tcp_skb_pcount(skb);
@@ -1393,7 +1398,7 @@ static inline int tcp_nagle_check(const struct tcp_sock *tp,
 /* Return non-zero if the Nagle test allows this packet to be
  * sent now.
  */
-static inline int tcp_nagle_test(struct tcp_sock *tp, struct sk_buff *skb,
+static inline int tcp_nagle_test(const struct tcp_sock *tp, const struct sk_buff *skb,
 				 unsigned int cur_mss, int nonagle)
 {
 	/* Nagle rule does not apply to frames, which sit in the middle of the
@@ -1409,7 +1414,7 @@ static inline int tcp_nagle_test(struct tcp_sock *tp, struct sk_buff *skb,
 	 * Nagle can be ignored during F-RTO too (see RFC4138).
 	 */
 	if (tcp_urg_mode(tp) || (tp->frto_counter == 2) ||
-	    (TCP_SKB_CB(skb)->flags & TCPHDR_FIN))
+	    (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN))
 		return 1;
 
 	if (!tcp_nagle_check(tp, skb, cur_mss, nonagle))
@@ -1419,7 +1424,7 @@ static inline int tcp_nagle_test(struct tcp_sock *tp, struct sk_buff *skb,
 }
 
 /* Does at least the first segment of SKB fit into the send window? */
-static inline int tcp_snd_wnd_test(struct tcp_sock *tp, struct sk_buff *skb,
+static inline int tcp_snd_wnd_test(const struct tcp_sock *tp, const struct sk_buff *skb,
 				   unsigned int cur_mss)
 {
 	u32 end_seq = TCP_SKB_CB(skb)->end_seq;
@@ -1434,10 +1439,10 @@ static inline int tcp_snd_wnd_test(struct tcp_sock *tp, struct sk_buff *skb,
  * should be put on the wire right now.  If so, it returns the number of
  * packets allowed by the congestion window.
  */
-static unsigned int tcp_snd_test(struct sock *sk, struct sk_buff *skb,
+static unsigned int tcp_snd_test(const struct sock *sk, struct sk_buff *skb,
 				 unsigned int cur_mss, int nonagle)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	unsigned int cwnd_quota;
 
 	tcp_init_tso_segs(sk, skb, cur_mss);
@@ -1455,7 +1460,7 @@ static unsigned int tcp_snd_test(struct sock *sk, struct sk_buff *skb,
 /* Test if sending is allowed right now. */
 int tcp_may_send_now(struct sock *sk)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb = tcp_send_head(sk);
 
 	return skb &&
@@ -1497,9 +1502,9 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
 	TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq;
 
 	/* PSH and FIN should only be set in the second packet. */
-	flags = TCP_SKB_CB(skb)->flags;
-	TCP_SKB_CB(skb)->flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
-	TCP_SKB_CB(buff)->flags = flags;
+	flags = TCP_SKB_CB(skb)->tcp_flags;
+	TCP_SKB_CB(skb)->tcp_flags = flags & ~(TCPHDR_FIN | TCPHDR_PSH);
+	TCP_SKB_CB(buff)->tcp_flags = flags;
 
 	/* This packet was never sent out yet, so no SACK bits. */
 	TCP_SKB_CB(buff)->sacked = 0;
@@ -1530,7 +1535,7 @@ static int tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
 	u32 send_win, cong_win, limit, in_flight;
 	int win_divisor;
 
-	if (TCP_SKB_CB(skb)->flags & TCPHDR_FIN)
+	if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
 		goto send_now;
 
 	if (icsk->icsk_ca_state != TCP_CA_Open)
@@ -1657,7 +1662,7 @@ static int tcp_mtu_probe(struct sock *sk)
 
 	TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(skb)->seq;
 	TCP_SKB_CB(nskb)->end_seq = TCP_SKB_CB(skb)->seq + probe_size;
-	TCP_SKB_CB(nskb)->flags = TCPHDR_ACK;
+	TCP_SKB_CB(nskb)->tcp_flags = TCPHDR_ACK;
 	TCP_SKB_CB(nskb)->sacked = 0;
 	nskb->csum = 0;
 	nskb->ip_summed = skb->ip_summed;
@@ -1677,11 +1682,11 @@ static int tcp_mtu_probe(struct sock *sk)
 		if (skb->len <= copy) {
 			/* We've eaten all the data from this skb.
 			 * Throw it away. */
-			TCP_SKB_CB(nskb)->flags |= TCP_SKB_CB(skb)->flags;
+			TCP_SKB_CB(nskb)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags;
 			tcp_unlink_write_queue(skb, sk);
 			sk_wmem_free_skb(sk, skb);
 		} else {
-			TCP_SKB_CB(nskb)->flags |= TCP_SKB_CB(skb)->flags &
+			TCP_SKB_CB(nskb)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags &
 						   ~(TCPHDR_FIN|TCPHDR_PSH);
 			if (!skb_shinfo(skb)->nr_frags) {
 				skb_pull(skb, copy);
@@ -1796,11 +1801,13 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
 		tcp_event_new_data_sent(sk, skb);
 
 		tcp_minshall_update(tp, mss_now, skb);
-		sent_pkts++;
+		sent_pkts += tcp_skb_pcount(skb);
 
 		if (push_one)
 			break;
 	}
+	if (inet_csk(sk)->icsk_ca_state == TCP_CA_Recovery)
+		tp->prr_out += sent_pkts;
 
 	if (likely(sent_pkts)) {
 		tcp_cwnd_validate(sk);
@@ -1985,7 +1992,7 @@ static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
 	TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(next_skb)->end_seq;
 
 	/* Merge over control information. This moves PSH/FIN etc. over */
-	TCP_SKB_CB(skb)->flags |= TCP_SKB_CB(next_skb)->flags;
+	TCP_SKB_CB(skb)->tcp_flags |= TCP_SKB_CB(next_skb)->tcp_flags;
 
 	/* All done, get rid of second SKB and account for it so
 	 * packet counting does not break.
@@ -2003,7 +2010,7 @@ static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
 }
 
 /* Check if coalescing SKBs is legal. */
-static int tcp_can_collapse(struct sock *sk, struct sk_buff *skb)
+static int tcp_can_collapse(const struct sock *sk, const struct sk_buff *skb)
 {
 	if (tcp_skb_pcount(skb) > 1)
 		return 0;
@@ -2033,7 +2040,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *to,
 
 	if (!sysctl_tcp_retrans_collapse)
 		return;
-	if (TCP_SKB_CB(skb)->flags & TCPHDR_SYN)
+	if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
 		return;
 
 	tcp_for_write_queue_from_safe(skb, tmp, sk) {
@@ -2125,12 +2132,12 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 	 * since it is cheap to do so and saves bytes on the network.
 	 */
 	if (skb->len > 0 &&
-	    (TCP_SKB_CB(skb)->flags & TCPHDR_FIN) &&
+	    (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) &&
 	    tp->snd_una == (TCP_SKB_CB(skb)->end_seq - 1)) {
 		if (!pskb_trim(skb, 0)) {
 			/* Reuse, even though it does some unnecessary work */
 			tcp_init_nondata_skb(skb, TCP_SKB_CB(skb)->end_seq - 1,
-					     TCP_SKB_CB(skb)->flags);
+					     TCP_SKB_CB(skb)->tcp_flags);
 			skb->ip_summed = CHECKSUM_NONE;
 		}
 	}
@@ -2179,7 +2186,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 static int tcp_can_forward_retransmit(struct sock *sk)
 {
 	const struct inet_connection_sock *icsk = inet_csk(sk);
-	struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk);
 
 	/* Forward retransmissions are possible only during Recovery. */
 	if (icsk->icsk_ca_state != TCP_CA_Recovery)
@@ -2294,6 +2301,9 @@ begin_fwd:
 			return;
 		NET_INC_STATS_BH(sock_net(sk), mib_idx);
 
+		if (inet_csk(sk)->icsk_ca_state == TCP_CA_Recovery)
+			tp->prr_out += tcp_skb_pcount(skb);
+
 		if (skb == tcp_write_queue_head(sk))
 			inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
 						  inet_csk(sk)->icsk_rto,
@@ -2317,7 +2327,7 @@ void tcp_send_fin(struct sock *sk)
 	mss_now = tcp_current_mss(sk);
 
 	if (tcp_send_head(sk) != NULL) {
-		TCP_SKB_CB(skb)->flags |= TCPHDR_FIN;
+		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_FIN;
 		TCP_SKB_CB(skb)->end_seq++;
 		tp->write_seq++;
 	} else {
@@ -2379,11 +2389,11 @@ int tcp_send_synack(struct sock *sk)
 	struct sk_buff *skb;
 
 	skb = tcp_write_queue_head(sk);
-	if (skb == NULL || !(TCP_SKB_CB(skb)->flags & TCPHDR_SYN)) {
+	if (skb == NULL || !(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) {
 		printk(KERN_DEBUG "tcp_send_synack: wrong queue state\n");
 		return -EFAULT;
 	}
-	if (!(TCP_SKB_CB(skb)->flags & TCPHDR_ACK)) {
+	if (!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_ACK)) {
 		if (skb_cloned(skb)) {
 			struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
 			if (nskb == NULL)
@@ -2397,7 +2407,7 @@ int tcp_send_synack(struct sock *sk)
 			skb = nskb;
 		}
 
-		TCP_SKB_CB(skb)->flags |= TCPHDR_ACK;
+		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ACK;
 		TCP_ECN_send_synack(tcp_sk(sk), skb);
 	}
 	TCP_SKB_CB(skb)->when = tcp_time_stamp;
@@ -2542,7 +2552,7 @@ EXPORT_SYMBOL(tcp_make_synack);
 /* Do all connect socket setups that can be done AF independent. */
 static void tcp_connect_init(struct sock *sk)
 {
-	struct dst_entry *dst = __sk_dst_get(sk);
+	const struct dst_entry *dst = __sk_dst_get(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	__u8 rcv_wscale;
 
@@ -2794,13 +2804,13 @@ int tcp_write_wakeup(struct sock *sk)
 		if (seg_size < TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq ||
 		    skb->len > mss) {
 			seg_size = min(seg_size, mss);
-			TCP_SKB_CB(skb)->flags |= TCPHDR_PSH;
+			TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
 			if (tcp_fragment(sk, skb, seg_size, mss))
 				return -1;
 		} else if (!tcp_skb_pcount(skb))
 			tcp_set_skb_tso_segs(sk, skb, mss);
 
-		TCP_SKB_CB(skb)->flags |= TCPHDR_PSH;
+		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
 		TCP_SKB_CB(skb)->when = tcp_time_stamp;
 		err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
 		if (!err)
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index ecd44b0c45f..2e0f0af76c1 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -334,7 +334,6 @@ void tcp_retransmit_timer(struct sock *sk)
 		 * connection. If the socket is an orphan, time it out,
 		 * we cannot allow such beasts to hang infinitely.
 		 */
-#ifdef TCP_DEBUG
 		struct inet_sock *inet = inet_sk(sk);
 		if (sk->sk_family == AF_INET) {
 			LIMIT_NETDEBUG(KERN_DEBUG "TCP: Peer %pI4:%u/%u unexpectedly shrunk window %u:%u (repaired)\n",
@@ -349,7 +348,6 @@ void tcp_retransmit_timer(struct sock *sk)
 			       inet->inet_num, tp->snd_una, tp->snd_nxt);
 		}
 #endif
-#endif
 		if (tcp_time_stamp - tp->rcv_tstamp > TCP_RTO_MAX) {
 			tcp_write_err(sk);
 			goto out;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1b5a19340a9..ebaa96bd346 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1267,7 +1267,7 @@ int udp_disconnect(struct sock *sk, int flags)
 	sk->sk_state = TCP_CLOSE;
 	inet->inet_daddr = 0;
 	inet->inet_dport = 0;
-	sock_rps_save_rxhash(sk, 0);
+	sock_rps_reset_rxhash(sk);
 	sk->sk_bound_dev_if = 0;
 	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
 		inet_reset_saddr(sk);
@@ -1355,7 +1355,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	int rc;
 
 	if (inet_sk(sk)->inet_daddr)
-		sock_rps_save_rxhash(sk, skb->rxhash);
+		sock_rps_save_rxhash(sk, skb);
 
 	rc = ip_queue_rcv_skb(sk, skb);
 	if (rc < 0) {
@@ -1461,10 +1461,9 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 		}
 	}
 
-	if (rcu_dereference_raw(sk->sk_filter)) {
-		if (udp_lib_checksum_complete(skb))
-			goto drop;
-	}
+	if (rcu_access_pointer(sk->sk_filter) &&
+	    udp_lib_checksum_complete(skb))
+		goto drop;
 
 
 	if (sk_rcvqueues_full(sk, skb))
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index fc5368ad2b0..a0b4c5da8d4 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -79,13 +79,13 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
 	struct rtable *rt = (struct rtable *)xdst->route;
 	const struct flowi4 *fl4 = &fl->u.ip4;
 
-	rt->rt_key_dst = fl4->daddr;
-	rt->rt_key_src = fl4->saddr;
-	rt->rt_key_tos = fl4->flowi4_tos;
-	rt->rt_route_iif = fl4->flowi4_iif;
-	rt->rt_iif = fl4->flowi4_iif;
-	rt->rt_oif = fl4->flowi4_oif;
-	rt->rt_mark = fl4->flowi4_mark;
+	xdst->u.rt.rt_key_dst = fl4->daddr;
+	xdst->u.rt.rt_key_src = fl4->saddr;
+	xdst->u.rt.rt_key_tos = fl4->flowi4_tos;
+	xdst->u.rt.rt_route_iif = fl4->flowi4_iif;
+	xdst->u.rt.rt_iif = fl4->flowi4_iif;
+	xdst->u.rt.rt_oif = fl4->flowi4_oif;
+	xdst->u.rt.rt_mark = fl4->flowi4_mark;
 
 	xdst->u.dst.dev = dev;
 	dev_hold(dev);
author	Linus Torvalds <torvalds@linux-foundation.org>	2011-10-25 13:25:22 +0200
committer	Linus Torvalds <torvalds@linux-foundation.org>	2011-10-25 13:25:22 +0200
commit	8a9ea3237e7eb5c25f09e429ad242ae5a3d5ea22 (patch)
tree	a0a63398a9983667d52cbbbf4e2405b4f22b1d83 /net/ipv4
parent	1be025d3cb40cd295123af2c394f7229ef9b30ca (diff)
parent	8b3408f8ee994973869d8ba32c5bf482bc4ddca4 (diff)