Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6

include/linux/netfilter/x_tables.h

···
 extern void xt_table_entry_swap_rcu(struct xt_table_info *old,
 				    struct xt_table_info *new);
 
+/*
+ * This helper is performance critical and must be inlined
+ */
+static inline unsigned long ifname_compare_aligned(const char *_a,
+						   const char *_b,
+						   const char *_mask)
+{
+	const unsigned long *a = (const unsigned long *)_a;
+	const unsigned long *b = (const unsigned long *)_b;
+	const unsigned long *mask = (const unsigned long *)_mask;
+	unsigned long ret;
+
+	ret = (a[0] ^ b[0]) & mask[0];
+	if (IFNAMSIZ > sizeof(unsigned long))
+		ret |= (a[1] ^ b[1]) & mask[1];
+	if (IFNAMSIZ > 2 * sizeof(unsigned long))
+		ret |= (a[2] ^ b[2]) & mask[2];
+	if (IFNAMSIZ > 3 * sizeof(unsigned long))
+		ret |= (a[3] ^ b[3]) & mask[3];
+	BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
+	return ret;
+}
+
 #ifdef CONFIG_COMPAT
 #include <net/compat.h>
 

include/net/netfilter/nf_conntrack.h

···
 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
 
-struct nf_conn
-{
+struct nf_conn {
 	/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
            plus 1 for any connection(s) we are `master' for */
 	struct nf_conntrack ct_general;
···
 #ifdef CONFIG_NET_NS
 	struct net *ct_net;
 #endif
-	struct rcu_head rcu;
 };
 
 static inline struct nf_conn *
···
 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
 
-extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced);
-extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced,
-				 unsigned int size);
+/*
+ * Allocate a hashtable of hlist_head (if nulls == 0),
+ * or hlist_nulls_head (if nulls == 1)
+ */
+extern void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls);
+
+extern void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size);
 
 extern struct nf_conntrack_tuple_hash *
 __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple);

include/net/netfilter/nf_conntrack_helper.h

···
 
 struct module;
 
+#define NF_CT_HELPER_NAME_LEN	16
+
 struct nf_conntrack_helper
 {
 	struct hlist_node hnode;	/* Internal use. */

include/net/netfilter/nf_conntrack_l3proto.h

···
 	int (*tuple_to_nlattr)(struct sk_buff *skb,
 			       const struct nf_conntrack_tuple *t);
 
+	/*
+	 * Calculate size of tuple nlattr
+	 */
+	int (*nlattr_tuple_size)(void);
+
 	int (*nlattr_to_tuple)(struct nlattr *tb[],
 			       struct nf_conntrack_tuple *t);
 	const struct nla_policy *nla_policy;
+
+	size_t nla_size;
 
 #ifdef CONFIG_SYSCTL
 	struct ctl_table_header	*ctl_table_header;

include/net/netfilter/nf_conntrack_l4proto.h

···
 	/* convert protoinfo to nfnetink attributes */
 	int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
 			 const struct nf_conn *ct);
+	/* Calculate protoinfo nlattr size */
+	int (*nlattr_size)(void);
 
 	/* convert nfnetlink attributes to protoinfo */
 	int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
 
 	int (*tuple_to_nlattr)(struct sk_buff *skb,
 			       const struct nf_conntrack_tuple *t);
+	/* Calculate tuple nlattr size */
+	int (*nlattr_tuple_size)(void);
 	int (*nlattr_to_tuple)(struct nlattr *tb[],
 			       struct nf_conntrack_tuple *t);
 	const struct nla_policy *nla_policy;
+
+	size_t nla_size;
 
 #ifdef CONFIG_SYSCTL
 	struct ctl_table_header	**ctl_table_header;
···
 				      const struct nf_conntrack_tuple *tuple);
 extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
 				      struct nf_conntrack_tuple *t);
+extern int nf_ct_port_nlattr_tuple_size(void);
 extern const struct nla_policy nf_ct_port_nla_policy[];
 
 #ifdef CONFIG_SYSCTL

include/net/netfilter/nf_conntrack_tuple.h

···
 
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <linux/list_nulls.h>
 
 /* A `tuple' is a structure containing the information to uniquely
   identify a connection.  ie. if two packets have the same tuple, they
···
 	((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 
 /* Connections have two entries in the hash table: one for each way */
-struct nf_conntrack_tuple_hash
-{
-	struct hlist_node hnode;
+struct nf_conntrack_tuple_hash {
+	struct hlist_nulls_node hnnode;
 	struct nf_conntrack_tuple tuple;
 };
 

include/net/netlink.h

···
 extern int		nla_parse(struct nlattr *tb[], int maxtype,
 				  struct nlattr *head, int len,
 				  const struct nla_policy *policy);
+extern int		nla_policy_len(const struct nla_policy *, int);
 extern struct nlattr *	nla_find(struct nlattr *head, int len, int attrtype);
 extern size_t		nla_strlcpy(char *dst, const struct nlattr *nla,
 				    size_t dstsize);

include/net/netns/conntrack.h

···
 #define __NETNS_CONNTRACK_H
 
 #include <linux/list.h>
+#include <linux/list_nulls.h>
 #include <asm/atomic.h>
 
 struct ctl_table_header;
···
 struct netns_ct {
 	atomic_t		count;
 	unsigned int		expect_count;
-	struct hlist_head	*hash;
+	struct hlist_nulls_head	*hash;
 	struct hlist_head	*expect_hash;
-	struct hlist_head	unconfirmed;
+	struct hlist_nulls_head	unconfirmed;
 	struct ip_conntrack_stat *stat;
 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 	struct nf_conntrack_ecache *ecache;

lib/nlattr.c

···
 }
 
 /**
+ * nla_policy_len - Determin the max. length of a policy
+ * @policy: policy to use
+ * @n: number of policies
+ *
+ * Determines the max. length of the policy.  It is currently used
+ * to allocated Netlink buffers roughly the size of the actual
+ * message.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int
+nla_policy_len(const struct nla_policy *p, int n)
+{
+	int i, len = 0;
+
+	for (i = 0; i < n; i++) {
+		if (p->len)
+			len += nla_total_size(p->len);
+		else if (nla_attr_minlen[p->type])
+			len += nla_total_size(nla_attr_minlen[p->type]);
+	}
+
+	return len;
+}
+
+/**
  * nla_parse - Parse a stream of attributes into a tb buffer
  * @tb: destination array with maxtype+1 elements
  * @maxtype: maximum attribute type to be expected
···
 #endif
 
 EXPORT_SYMBOL(nla_validate);
+EXPORT_SYMBOL(nla_policy_len);
 EXPORT_SYMBOL(nla_parse);
 EXPORT_SYMBOL(nla_find);
 EXPORT_SYMBOL(nla_strlcpy);

net/ipv4/netfilter/arp_tables.c

···
 static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
 {
 #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-	const unsigned long *a = (const unsigned long *)_a;
-	const unsigned long *b = (const unsigned long *)_b;
-	const unsigned long *mask = (const unsigned long *)_mask;
-	unsigned long ret;
-
-	ret = (a[0] ^ b[0]) & mask[0];
-	if (IFNAMSIZ > sizeof(unsigned long))
-		ret |= (a[1] ^ b[1]) & mask[1];
-	if (IFNAMSIZ > 2 * sizeof(unsigned long))
-		ret |= (a[2] ^ b[2]) & mask[2];
-	if (IFNAMSIZ > 3 * sizeof(unsigned long))
-		ret |= (a[3] ^ b[3]) & mask[3];
-	BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
+	unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
 #else
 	unsigned long ret = 0;
 	const u16 *a = (const u16 *)_a;
···
 			    && unconditional(&e->arp)) || visited) {
 				unsigned int oldpos, size;
 
-				if (t->verdict < -NF_MAX_VERDICT - 1) {
+				if ((strcmp(t->target.u.user.name,
+					    ARPT_STANDARD_TARGET) == 0) &&
+				    t->verdict < -NF_MAX_VERDICT - 1) {
 					duprintf("mark_source_chains: bad "
 						"negative verdict (%i)\n",
 								t->verdict);

net/ipv4/netfilter/ip_tables.c

···
 
    Hence the start of any table is given by get_table() below.  */
 
-static unsigned long ifname_compare(const char *_a, const char *_b,
-				    const unsigned char *_mask)
-{
-	const unsigned long *a = (const unsigned long *)_a;
-	const unsigned long *b = (const unsigned long *)_b;
-	const unsigned long *mask = (const unsigned long *)_mask;
-	unsigned long ret;
-
-	ret = (a[0] ^ b[0]) & mask[0];
-	if (IFNAMSIZ > sizeof(unsigned long))
-		ret |= (a[1] ^ b[1]) & mask[1];
-	if (IFNAMSIZ > 2 * sizeof(unsigned long))
-		ret |= (a[2] ^ b[2]) & mask[2];
-	if (IFNAMSIZ > 3 * sizeof(unsigned long))
-		ret |= (a[3] ^ b[3]) & mask[3];
-	BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
-	return ret;
-}
-
 /* Returns whether matches rule or not. */
 /* Performance critical - called for every packet */
 static inline bool
···
 		return false;
 	}
 
-	ret = ifname_compare(indev, ipinfo->iniface, ipinfo->iniface_mask);
+	ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
 
 	if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
 		dprintf("VIA in mismatch (%s vs %s).%s\n",
···
 		return false;
 	}
 
-	ret = ifname_compare(outdev, ipinfo->outiface, ipinfo->outiface_mask);
+	ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
 
 	if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
 		dprintf("VIA out mismatch (%s vs %s).%s\n",
···
 			    && unconditional(&e->ip)) || visited) {
 				unsigned int oldpos, size;
 
-				if (t->verdict < -NF_MAX_VERDICT - 1) {
+				if ((strcmp(t->target.u.user.name,
+			    		    IPT_STANDARD_TARGET) == 0) &&
+				    t->verdict < -NF_MAX_VERDICT - 1) {
 					duprintf("mark_source_chains: bad "
 						"negative verdict (%i)\n",
 								t->verdict);

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

···
 
 	return 0;
 }
+
+static int ipv4_nlattr_tuple_size(void)
+{
+	return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1);
+}
 #endif
 
 static struct nf_sockopt_ops so_getorigdst = {
···
 	.get_l4proto	 = ipv4_get_l4proto,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr = ipv4_tuple_to_nlattr,
+	.nlattr_tuple_size = ipv4_nlattr_tuple_size,
 	.nlattr_to_tuple = ipv4_nlattr_to_tuple,
 	.nla_policy	 = ipv4_nla_policy,
 #endif

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c

···
 	unsigned int bucket;
 };
 
-static struct hlist_node *ct_get_first(struct seq_file *seq)
+static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 {
 	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 
 	for (st->bucket = 0;
 	     st->bucket < nf_conntrack_htable_size;
 	     st->bucket++) {
 		n = rcu_dereference(net->ct.hash[st->bucket].first);
-		if (n)
+		if (!is_a_nulls(n))
 			return n;
 	}
 	return NULL;
 }
 
-static struct hlist_node *ct_get_next(struct seq_file *seq,
-				      struct hlist_node *head)
+static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
+				      struct hlist_nulls_node *head)
 {
 	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 
 	head = rcu_dereference(head->next);
-	while (head == NULL) {
-		if (++st->bucket >= nf_conntrack_htable_size)
-			return NULL;
+	while (is_a_nulls(head)) {
+		if (likely(get_nulls_value(head) == st->bucket)) {
+			if (++st->bucket >= nf_conntrack_htable_size)
+				return NULL;
+		}
 		head = rcu_dereference(net->ct.hash[st->bucket].first);
 	}
 	return head;
 }
 
-static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
+static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 {
-	struct hlist_node *head = ct_get_first(seq);
+	struct hlist_nulls_node *head = ct_get_first(seq);
 
 	if (head)
 		while (pos && (head = ct_get_next(seq, head)))
···
 
 static int ct_seq_show(struct seq_file *s, void *v)
 {
-	const struct nf_conntrack_tuple_hash *hash = v;
-	const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
+	struct nf_conntrack_tuple_hash *hash = v;
+	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 	const struct nf_conntrack_l3proto *l3proto;
 	const struct nf_conntrack_l4proto *l4proto;
+	int ret = 0;
 
 	NF_CT_ASSERT(ct);
+	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
+		return 0;
+
 
 	/* we only want to print DIR_ORIGINAL */
 	if (NF_CT_DIRECTION(hash))
-		return 0;
+		goto release;
 	if (nf_ct_l3num(ct) != AF_INET)
-		return 0;
+		goto release;
 
 	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 	NF_CT_ASSERT(l3proto);
 	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 	NF_CT_ASSERT(l4proto);
 
+	ret = -ENOSPC;
 	if (seq_printf(s, "%-8s %u %ld ",
 		      l4proto->name, nf_ct_protonum(ct),
 		      timer_pending(&ct->timeout)
 		      ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
-		return -ENOSPC;
+		goto release;
 
 	if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
-		return -ENOSPC;
+		goto release;
 
 	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 			l3proto, l4proto))
-		return -ENOSPC;
+		goto release;
 
 	if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
-		return -ENOSPC;
+		goto release;
 
 	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 		if (seq_printf(s, "[UNREPLIED] "))
-			return -ENOSPC;
+			goto release;
 
 	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 			l3proto, l4proto))
-		return -ENOSPC;
+		goto release;
 
 	if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
-		return -ENOSPC;
+		goto release;
 
 	if (test_bit(IPS_ASSURED_BIT, &ct->status))
 		if (seq_printf(s, "[ASSURED] "))
-			return -ENOSPC;
+			goto release;
 
 #ifdef CONFIG_NF_CONNTRACK_MARK
 	if (seq_printf(s, "mark=%u ", ct->mark))
-		return -ENOSPC;
+		goto release;
 #endif
 
 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 	if (seq_printf(s, "secmark=%u ", ct->secmark))
-		return -ENOSPC;
+		goto release;
 #endif
 
 	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
-		return -ENOSPC;
-
-	return 0;
+		goto release;
+	ret = 0;
+release:
+	nf_ct_put(ct);
+	return ret;
 }
 
 static const struct seq_operations ct_seq_ops = {

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

···
 
 	return 0;
 }
+
+static int icmp_nlattr_tuple_size(void)
+{
+	return nla_policy_len(icmp_nla_policy, CTA_PROTO_MAX + 1);
+}
 #endif
 
 #ifdef CONFIG_SYSCTL
···
 	.me			= NULL,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= icmp_tuple_to_nlattr,
+	.nlattr_tuple_size	= icmp_nlattr_tuple_size,
 	.nlattr_to_tuple	= icmp_nlattr_to_tuple,
 	.nla_policy		= icmp_nla_policy,
 #endif

net/ipv4/netfilter/nf_nat_core.c

···
 static int __net_init nf_nat_net_init(struct net *net)
 {
 	net->ipv4.nat_bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
-						      &net->ipv4.nat_vmalloced);
+						      &net->ipv4.nat_vmalloced, 0);
 	if (!net->ipv4.nat_bysource)
 		return -ENOMEM;
 	return 0;

net/ipv6/netfilter/ip6_tables.c

···
 		 (nexthdr == IPPROTO_DSTOPTS) );
 }
 
-static unsigned long ifname_compare(const char *_a, const char *_b,
-				    const unsigned char *_mask)
-{
-	const unsigned long *a = (const unsigned long *)_a;
-	const unsigned long *b = (const unsigned long *)_b;
-	const unsigned long *mask = (const unsigned long *)_mask;
-	unsigned long ret;
-
-	ret = (a[0] ^ b[0]) & mask[0];
-	if (IFNAMSIZ > sizeof(unsigned long))
-		ret |= (a[1] ^ b[1]) & mask[1];
-	if (IFNAMSIZ > 2 * sizeof(unsigned long))
-		ret |= (a[2] ^ b[2]) & mask[2];
-	if (IFNAMSIZ > 3 * sizeof(unsigned long))
-		ret |= (a[3] ^ b[3]) & mask[3];
-	BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
-	return ret;
-}
-
 /* Returns whether matches rule or not. */
 /* Performance critical - called for every packet */
 static inline bool
···
 		return false;
 	}
 
-	ret = ifname_compare(indev, ip6info->iniface, ip6info->iniface_mask);
+	ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
 
 	if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
 		dprintf("VIA in mismatch (%s vs %s).%s\n",
···
 		return false;
 	}
 
-	ret = ifname_compare(outdev, ip6info->outiface, ip6info->outiface_mask);
+	ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
 
 	if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
 		dprintf("VIA out mismatch (%s vs %s).%s\n",
···
 			    && unconditional(&e->ipv6)) || visited) {
 				unsigned int oldpos, size;
 
-				if (t->verdict < -NF_MAX_VERDICT - 1) {
+				if ((strcmp(t->target.u.user.name,
+					    IP6T_STANDARD_TARGET) == 0) &&
+				    t->verdict < -NF_MAX_VERDICT - 1) {
 					duprintf("mark_source_chains: bad "
 						"negative verdict (%i)\n",
 								t->verdict);

net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c

···
 
 	return 0;
 }
+
+static int ipv6_nlattr_tuple_size(void)
+{
+	return nla_policy_len(ipv6_nla_policy, CTA_IP_MAX + 1);
+}
 #endif
 
 struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly = {
···
 	.get_l4proto		= ipv6_get_l4proto,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= ipv6_tuple_to_nlattr,
+	.nlattr_tuple_size	= ipv6_nlattr_tuple_size,
 	.nlattr_to_tuple	= ipv6_nlattr_to_tuple,
 	.nla_policy		= ipv6_nla_policy,
 #endif

net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c

···
 
 	return 0;
 }
+
+static int icmpv6_nlattr_tuple_size(void)
+{
+	return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
+}
 #endif
 
 #ifdef CONFIG_SYSCTL
···
 	.error			= icmpv6_error,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= icmpv6_tuple_to_nlattr,
+	.nlattr_tuple_size	= icmpv6_nlattr_tuple_size,
 	.nlattr_to_tuple	= icmpv6_nlattr_to_tuple,
 	.nla_policy		= icmpv6_nla_policy,
 #endif

net/netfilter/Kconfig

···
 
 config NETFILTER_XT_TARGET_LED
 	tristate '"LED" target support'
-	depends on LEDS_CLASS
+	depends on LEDS_CLASS && LED_TRIGGERS
 	depends on NETFILTER_ADVANCED
 	help
 	  This option adds a `LED' target, which allows you to blink LEDs in

net/netfilter/nf_conntrack_core.c

···
 #include <linux/netdevice.h>
 #include <linux/socket.h>
 #include <linux/mm.h>
+#include <linux/rculist_nulls.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_l3proto.h>
···
 clean_from_lists(struct nf_conn *ct)
 {
 	pr_debug("clean_from_lists(%p)\n", ct);
-	hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
-	hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode);
+	hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
+	hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode);
 
 	/* Destroy all pending expectations */
 	nf_ct_remove_expectations(ct);
···
 
 	/* We overload first tuple to link into unconfirmed list. */
 	if (!nf_ct_is_confirmed(ct)) {
-		BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode));
-		hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
+		BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode));
+		hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
 	}
 
 	NF_CT_STAT_INC(net, delete);
···
 	nf_ct_put(ct);
 }
 
+/*
+ * Warning :
+ * - Caller must take a reference on returned object
+ *   and recheck nf_ct_tuple_equal(tuple, &h->tuple)
+ * OR
+ * - Caller must lock nf_conntrack_lock before calling this function
+ */
 struct nf_conntrack_tuple_hash *
 __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_tuple_hash *h;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 	unsigned int hash = hash_conntrack(tuple);
 
 	/* Disable BHs the entire time since we normally need to disable them
 	 * at least once for the stats anyway.
 	 */
 	local_bh_disable();
-	hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnode) {
+begin:
+	hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
 		if (nf_ct_tuple_equal(tuple, &h->tuple)) {
 			NF_CT_STAT_INC(net, found);
 			local_bh_enable();
···
 		}
 		NF_CT_STAT_INC(net, searched);
 	}
+	/*
+	 * if the nulls value we got at the end of this lookup is
+	 * not the expected one, we must restart lookup.
+	 * We probably met an item that was moved to another chain.
+	 */
+	if (get_nulls_value(n) != hash)
+		goto begin;
 	local_bh_enable();
 
 	return NULL;
···
 	struct nf_conn *ct;
 
 	rcu_read_lock();
+begin:
 	h = __nf_conntrack_find(net, tuple);
 	if (h) {
 		ct = nf_ct_tuplehash_to_ctrack(h);
 		if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 			h = NULL;
+		else {
+			if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) {
+				nf_ct_put(ct);
+				goto begin;
+			}
+		}
 	}
 	rcu_read_unlock();
 
···
 {
 	struct net *net = nf_ct_net(ct);
 
-	hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
 			   &net->ct.hash[hash]);
-	hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode,
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
 			   &net->ct.hash[repl_hash]);
 }
 
···
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conn *ct;
 	struct nf_conn_help *help;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 	enum ip_conntrack_info ctinfo;
 	struct net *net;
 
···
 	/* See if there's one in the list already, including reverse:
 	   NAT could have grabbed it without realizing, since we're
 	   not in the hash.  If there is, we lost race. */
-	hlist_for_each_entry(h, n, &net->ct.hash[hash], hnode)
+	hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
 		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 				      &h->tuple))
 			goto out;
-	hlist_for_each_entry(h, n, &net->ct.hash[repl_hash], hnode)
+	hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode)
 		if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 				      &h->tuple))
 			goto out;
 
 	/* Remove from unconfirmed list */
-	hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
+	hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
 
 	__nf_conntrack_hash_insert(ct, hash, repl_hash);
 	/* Timer relative to confirmation time, not original
···
 {
 	struct net *net = nf_ct_net(ignored_conntrack);
 	struct nf_conntrack_tuple_hash *h;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 	unsigned int hash = hash_conntrack(tuple);
 
 	/* Disable BHs the entire time since we need to disable them at
 	 * least once for the stats anyway.
 	 */
 	rcu_read_lock_bh();
-	hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnode) {
+	hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
 		if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack &&
 		    nf_ct_tuple_equal(tuple, &h->tuple)) {
 			NF_CT_STAT_INC(net, found);
···
 	/* Use oldest entry, which is roughly LRU */
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conn *ct = NULL, *tmp;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 	unsigned int i, cnt = 0;
 	int dropped = 0;
 
 	rcu_read_lock();
 	for (i = 0; i < nf_conntrack_htable_size; i++) {
-		hlist_for_each_entry_rcu(h, n, &net->ct.hash[hash],
-					 hnode) {
+		hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash],
+					 hnnode) {
 			tmp = nf_ct_tuplehash_to_ctrack(h);
 			if (!test_bit(IPS_ASSURED_BIT, &tmp->status))
 				ct = tmp;
···
 #ifdef CONFIG_NET_NS
 	ct->ct_net = net;
 #endif
-	INIT_RCU_HEAD(&ct->rcu);
 
 	return ct;
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
-
-static void nf_conntrack_free_rcu(struct rcu_head *head)
-{
-	struct nf_conn *ct = container_of(head, struct nf_conn, rcu);
-
-	nf_ct_ext_free(ct);
-	kmem_cache_free(nf_conntrack_cachep, ct);
-}
 
 void nf_conntrack_free(struct nf_conn *ct)
 {
···
 
 	nf_ct_ext_destroy(ct);
 	atomic_dec(&net->ct.count);
-	call_rcu(&ct->rcu, nf_conntrack_free_rcu);
+	nf_ct_ext_free(ct);
+	kmem_cache_free(nf_conntrack_cachep, ct);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_free);
 
···
 	}
 
 	/* Overload tuple linked list to put us in unconfirmed list. */
-	hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
 		       &net->ct.unconfirmed);
 
 	spin_unlock_bh(&nf_conntrack_lock);
···
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple);
+
+int nf_ct_port_nlattr_tuple_size(void)
+{
+	return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
+}
+EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size);
 #endif
 
 /* Used by ipt_REJECT and ip6t_REJECT. */
···
 {
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conn *ct;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 
 	spin_lock_bh(&nf_conntrack_lock);
 	for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
-		hlist_for_each_entry(h, n, &net->ct.hash[*bucket], hnode) {
+		hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) {
 			ct = nf_ct_tuplehash_to_ctrack(h);
 			if (iter(ct, data))
 				goto found;
 		}
 	}
-	hlist_for_each_entry(h, n, &net->ct.unconfirmed, hnode) {
+	hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) {
 		ct = nf_ct_tuplehash_to_ctrack(h);
 		if (iter(ct, data))
 			set_bit(IPS_DYING_BIT, &ct->status);
···
 	return 1;
 }
 
-void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, unsigned int size)
+void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size)
 {
 	if (vmalloced)
 		vfree(hash);
···
 	}
 }
 
-struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced)
+void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls)
 {
-	struct hlist_head *hash;
-	unsigned int size, i;
+	struct hlist_nulls_head *hash;
+	unsigned int nr_slots, i;
+	size_t sz;
 
 	*vmalloced = 0;
 
-	size = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_head));
-	hash = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN,
-				       get_order(sizeof(struct hlist_head)
-						 * size));
+	BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
+	nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
+	sz = nr_slots * sizeof(struct hlist_nulls_head);
+	hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
+					get_order(sz));
 	if (!hash) {
 		*vmalloced = 1;
 		printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n");
-		hash = vmalloc(sizeof(struct hlist_head) * size);
+		hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
 	}
 
-	if (hash)
-		for (i = 0; i < size; i++)
-			INIT_HLIST_HEAD(&hash[i]);
+	if (hash && nulls)
+		for (i = 0; i < nr_slots; i++)
+			INIT_HLIST_NULLS_HEAD(&hash[i], i);
 
 	return hash;
 }
···
 	int i, bucket, vmalloced, old_vmalloced;
 	unsigned int hashsize, old_size;
 	int rnd;
-	struct hlist_head *hash, *old_hash;
+	struct hlist_nulls_head *hash, *old_hash;
 	struct nf_conntrack_tuple_hash *h;
 
 	/* On boot, we can set this without any fancy locking. */
···
 	if (!hashsize)
 		return -EINVAL;
 
-	hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced);
+	hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1);
 	if (!hash)
 		return -ENOMEM;
 
···
 	 */
 	spin_lock_bh(&nf_conntrack_lock);
 	for (i = 0; i < nf_conntrack_htable_size; i++) {
-		while (!hlist_empty(&init_net.ct.hash[i])) {
-			h = hlist_entry(init_net.ct.hash[i].first,
-					struct nf_conntrack_tuple_hash, hnode);
-			hlist_del_rcu(&h->hnode);
+		while (!hlist_nulls_empty(&init_net.ct.hash[i])) {
+			h = hlist_nulls_entry(init_net.ct.hash[i].first,
+					struct nf_conntrack_tuple_hash, hnnode);
+			hlist_nulls_del_rcu(&h->hnnode);
 			bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
-			hlist_add_head(&h->hnode, &hash[bucket]);
+			hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]);
 		}
 	}
 	old_size = nf_conntrack_htable_size;
···
 
 	nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
 						sizeof(struct nf_conn),
-						0, 0, NULL);
+						0, SLAB_DESTROY_BY_RCU, NULL);
 	if (!nf_conntrack_cachep) {
 		printk(KERN_ERR "Unable to create nf_conn slab cache\n");
 		ret = -ENOMEM;
···
 	int ret;
 
 	atomic_set(&net->ct.count, 0);
-	INIT_HLIST_HEAD(&net->ct.unconfirmed);
+	INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0);
 	net->ct.stat = alloc_percpu(struct ip_conntrack_stat);
 	if (!net->ct.stat) {
 		ret = -ENOMEM;
···
 	if (ret < 0)
 		goto err_ecache;
 	net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
-						  &net->ct.hash_vmalloc);
+					     &net->ct.hash_vmalloc, 1);
 	if (!net->ct.hash) {
 		ret = -ENOMEM;
 		printk(KERN_ERR "Unable to create nf_conntrack_hash\n");

net/netfilter/nf_conntrack_expect.c

···
 
 	net->ct.expect_count = 0;
 	net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize,
-						  &net->ct.expect_vmalloc);
+						  &net->ct.expect_vmalloc, 0);
 	if (net->ct.expect_hash == NULL)
 		goto err1;
 

net/netfilter/nf_conntrack_helper.c

···
 
 	BUG_ON(me->expect_policy == NULL);
 	BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES);
+	BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1);
 
 	mutex_lock(&nf_ct_helper_mutex);
 	hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]);
···
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conntrack_expect *exp;
 	const struct hlist_node *n, *next;
+	const struct hlist_nulls_node *nn;
 	unsigned int i;
 
 	/* Get rid of expectations */
···
 	}
 
 	/* Get rid of expecteds, set helpers to NULL. */
-	hlist_for_each_entry(h, n, &net->ct.unconfirmed, hnode)
+	hlist_for_each_entry(h, nn, &net->ct.unconfirmed, hnnode)
 		unhelp(h, me);
 	for (i = 0; i < nf_conntrack_htable_size; i++) {
-		hlist_for_each_entry(h, n, &net->ct.hash[i], hnode)
+		hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode)
 			unhelp(h, me);
 	}
 }
···
 
 	nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
 	nf_ct_helper_hash = nf_ct_alloc_hashtable(&nf_ct_helper_hsize,
-						  &nf_ct_helper_vmalloc);
+						  &nf_ct_helper_vmalloc, 0);
 	if (!nf_ct_helper_hash)
 		return -ENOMEM;
 

net/netfilter/nf_conntrack_netlink.c

···
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/rculist.h>
+#include <linux/rculist_nulls.h>
 #include <linux/types.h>
 #include <linux/timer.h>
 #include <linux/skbuff.h>
···
 }
 
 #ifdef CONFIG_NF_CONNTRACK_EVENTS
+/*
+ * The general structure of a ctnetlink event is
+ *
+ *  CTA_TUPLE_ORIG
+ *    <l3/l4-proto-attributes>
+ *  CTA_TUPLE_REPLY
+ *    <l3/l4-proto-attributes>
+ *  CTA_ID
+ *  ...
+ *  CTA_PROTOINFO
+ *    <l4-proto-attributes>
+ *  CTA_TUPLE_MASTER
+ *    <l3/l4-proto-attributes>
+ *
+ * Therefore the formular is
+ *
+ *   size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
+ *		+ sizeof(protoinfo_nlas)
+ */
+static struct sk_buff *
+ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
+{
+	struct nf_conntrack_l3proto *l3proto;
+	struct nf_conntrack_l4proto *l4proto;
+	int len;
+
+#define NLA_TYPE_SIZE(type)		nla_total_size(sizeof(type))
+
+	/* proto independant part */
+	len = NLMSG_SPACE(sizeof(struct nfgenmsg))
+		+ 3 * nla_total_size(0)		/* CTA_TUPLE_ORIG|REPL|MASTER */
+		+ 3 * nla_total_size(0)		/* CTA_TUPLE_IP */
+		+ 3 * nla_total_size(0)		/* CTA_TUPLE_PROTO */
+		+ 3 * NLA_TYPE_SIZE(u_int8_t)	/* CTA_PROTO_NUM */
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_ID */
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_STATUS */
+#ifdef CONFIG_NF_CT_ACCT
+		+ 2 * nla_total_size(0)		/* CTA_COUNTERS_ORIG|REPL */
+		+ 2 * NLA_TYPE_SIZE(uint64_t)	/* CTA_COUNTERS_PACKETS */
+		+ 2 * NLA_TYPE_SIZE(uint64_t)	/* CTA_COUNTERS_BYTES */
+#endif
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_TIMEOUT */
+		+ nla_total_size(0)		/* CTA_PROTOINFO */
+		+ nla_total_size(0)		/* CTA_HELP */
+		+ nla_total_size(NF_CT_HELPER_NAME_LEN)	/* CTA_HELP_NAME */
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_SECMARK */
+#endif
+#ifdef CONFIG_NF_NAT_NEEDED
+		+ 2 * nla_total_size(0)		/* CTA_NAT_SEQ_ADJ_ORIG|REPL */
+		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_POS */
+		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_BEFORE */
+		+ 2 * NLA_TYPE_SIZE(u_int32_t)	/* CTA_NAT_SEQ_CORRECTION_AFTER */
+#endif
+#ifdef CONFIG_NF_CONNTRACK_MARK
+		+ NLA_TYPE_SIZE(u_int32_t)	/* CTA_MARK */
+#endif
+		;
+
+#undef NLA_TYPE_SIZE
+
+	rcu_read_lock();
+	l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
+	len += l3proto->nla_size;
+
+	l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
+	len += l4proto->nla_size;
+	rcu_read_unlock();
+
+	return alloc_skb(len, gfp);
+}
+
 static int ctnetlink_conntrack_event(struct notifier_block *this,
 				     unsigned long events, void *ptr)
 {
···
 	if (!item->report && !nfnetlink_has_listeners(group))
 		return NOTIFY_DONE;
 
-	skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+	skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
 	if (!skb)
 		return NOTIFY_DONE;
 
···
 {
 	struct nf_conn *ct, *last;
 	struct nf_conntrack_tuple_hash *h;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 	struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 	u_int8_t l3proto = nfmsg->nfgen_family;
 
···
 	last = (struct nf_conn *)cb->args[1];
 	for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 restart:
-		hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
-					 hnode) {
+		hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
+					 hnnode) {
 			if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 				continue;
 			ct = nf_ct_tuplehash_to_ctrack(h);
+			if (!atomic_inc_not_zero(&ct->ct_general.use))
+				continue;
 			/* Dump entries of a given L3 protocol number.
 			 * If it is not specified, ie. l3proto == 0,
 			 * then dump everything. */
 			if (l3proto && nf_ct_l3num(ct) != l3proto)
-				continue;
+				goto releasect;
 			if (cb->args[1]) {
 				if (ct != last)
-					continue;
+					goto releasect;
 				cb->args[1] = 0;
 			}
 			if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 						cb->nlh->nlmsg_seq,
 						IPCTNL_MSG_CT_NEW,
 						1, ct) < 0) {
-				if (!atomic_inc_not_zero(&ct->ct_general.use))
-					continue;
 				cb->args[1] = (unsigned long)ct;
 				goto out;
 			}
···
 				if (acct)
 					memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 			}
+releasect:
+		nf_ct_put(ct);
 		}
 		if (cb->args[1]) {
 			cb->args[1] = 0;
···
 		if (err < 0)
 			goto err2;
 
-		master_h = __nf_conntrack_find(&init_net, &master);
+		master_h = nf_conntrack_find_get(&init_net, &master);
 		if (master_h == NULL) {
 			err = -ENOENT;
 			goto err2;
 		}
 		master_ct = nf_ct_tuplehash_to_ctrack(master_h);
-		nf_conntrack_get(&master_ct->ct_general);
 		__set_bit(IPS_EXPECTED_BIT, &ct->status);
 		ct->master = master_ct;
 	}

net/netfilter/nf_conntrack_proto.c

···
 	if (proto->l3proto >= AF_MAX)
 		return -EBUSY;
 
+	if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size)
+		return -EINVAL;
+
 	mutex_lock(&nf_ct_proto_mutex);
 	if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) {
 		ret = -EBUSY;
···
 	ret = nf_ct_l3proto_register_sysctl(proto);
 	if (ret < 0)
 		goto out_unlock;
+
+	if (proto->nlattr_tuple_size)
+		proto->nla_size = 3 * proto->nlattr_tuple_size();
 
 	rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
 
···
 	if (l4proto->l3proto >= PF_MAX)
 		return -EBUSY;
 
+	if ((l4proto->to_nlattr && !l4proto->nlattr_size)
+		|| (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size))
+		return -EINVAL;
+
 	mutex_lock(&nf_ct_proto_mutex);
 	if (!nf_ct_protos[l4proto->l3proto]) {
 		/* l3proto may be loaded latter. */
···
 	ret = nf_ct_l4proto_register_sysctl(l4proto);
 	if (ret < 0)
 		goto out_unlock;
+
+	l4proto->nla_size = 0;
+	if (l4proto->nlattr_size)
+		l4proto->nla_size += l4proto->nlattr_size();
+	if (l4proto->nlattr_tuple_size)
+		l4proto->nla_size += 3 * l4proto->nlattr_tuple_size();
 
 	rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
 			   l4proto);

net/netfilter/nf_conntrack_proto_dccp.c

···
 	write_unlock_bh(&dccp_lock);
 	return 0;
 }
+
+static int dccp_nlattr_size(void)
+{
+	return nla_total_size(0)	/* CTA_PROTOINFO_DCCP */
+		+ nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1);
+}
 #endif
 
 #ifdef CONFIG_SYSCTL
···
 	.print_conntrack	= dccp_print_conntrack,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= dccp_to_nlattr,
+	.nlattr_size		= dccp_nlattr_size,
 	.from_nlattr		= nlattr_to_dccp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
···
 	.to_nlattr		= dccp_to_nlattr,
 	.from_nlattr		= nlattr_to_dccp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif

net/netfilter/nf_conntrack_proto_gre.c

···
 	.me 		 = THIS_MODULE,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
 	.nla_policy	 = nf_ct_port_nla_policy,
 #endif

net/netfilter/nf_conntrack_proto_sctp.c

···
 
 	return 0;
 }
+
+static int sctp_nlattr_size(void)
+{
+	return nla_total_size(0)	/* CTA_PROTOINFO_SCTP */
+		+ nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
+}
 #endif
 
 #ifdef CONFIG_SYSCTL
···
 	.me 			= THIS_MODULE,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= sctp_to_nlattr,
+	.nlattr_size		= sctp_nlattr_size,
 	.from_nlattr		= nlattr_to_sctp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
···
 	.me 			= THIS_MODULE,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= sctp_to_nlattr,
+	.nlattr_size		= sctp_nlattr_size,
 	.from_nlattr		= nlattr_to_sctp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif

net/netfilter/nf_conntrack_proto_tcp.c

···
 
 	return 0;
 }
+
+static int tcp_nlattr_size(void)
+{
+	return nla_total_size(0)	   /* CTA_PROTOINFO_TCP */
+		+ nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1);
+}
+
+static int tcp_nlattr_tuple_size(void)
+{
+	return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
+}
 #endif
 
 #ifdef CONFIG_SYSCTL
···
 	.error			= tcp_error,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= tcp_to_nlattr,
+	.nlattr_size		= tcp_nlattr_size,
 	.from_nlattr		= nlattr_to_tcp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= tcp_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_SYSCTL
···
 	.error			= tcp_error,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= tcp_to_nlattr,
+	.nlattr_size		= tcp_nlattr_size,
 	.from_nlattr		= nlattr_to_tcp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= tcp_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_SYSCTL

net/netfilter/nf_conntrack_proto_udp.c

···
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_SYSCTL
···
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif
 #ifdef CONFIG_SYSCTL

net/netfilter/nf_conntrack_proto_udplite.c

···
 	.error			= udplite_error,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
+	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,
 	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
 	.nla_policy		= nf_ct_port_nla_policy,
 #endif

net/netfilter/nf_conntrack_standalone.c

···
 	unsigned int bucket;
 };
 
-static struct hlist_node *ct_get_first(struct seq_file *seq)
+static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 {
 	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
-	struct hlist_node *n;
+	struct hlist_nulls_node *n;
 
 	for (st->bucket = 0;
 	     st->bucket < nf_conntrack_htable_size;
 	     st->bucket++) {
 		n = rcu_dereference(net->ct.hash[st->bucket].first);
-		if (n)
+		if (!is_a_nulls(n))
 			return n;
 	}
 	return NULL;
 }
 
-static struct hlist_node *ct_get_next(struct seq_file *seq,
-				      struct hlist_node *head)
+static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
+				      struct hlist_nulls_node *head)
 {
 	struct net *net = seq_file_net(seq);
 	struct ct_iter_state *st = seq->private;
 
 	head = rcu_dereference(head->next);
-	while (head == NULL) {
-		if (++st->bucket >= nf_conntrack_htable_size)
-			return NULL;
+	while (is_a_nulls(head)) {
+		if (likely(get_nulls_value(head) == st->bucket)) {
+			if (++st->bucket >= nf_conntrack_htable_size)
+				return NULL;
+		}
 		head = rcu_dereference(net->ct.hash[st->bucket].first);
 	}
 	return head;
 }
 
-static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
+static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 {
-	struct hlist_node *head = ct_get_first(seq);
+	struct hlist_nulls_node *head = ct_get_first(seq);
 
 	if (head)
 		while (pos && (head = ct_get_next(seq, head)))
···
 /* return 0 on success, 1 in case of error */
 static int ct_seq_show(struct seq_file *s, void *v)
 {
-	const struct nf_conntrack_tuple_hash *hash = v;
-	const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
+	struct nf_conntrack_tuple_hash *hash = v;
+	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 	const struct nf_conntrack_l3proto *l3proto;
 	const struct nf_conntrack_l4proto *l4proto;
+	int ret = 0;
 
 	NF_CT_ASSERT(ct);
+	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
+		return 0;
 
 	/* we only want to print DIR_ORIGINAL */
 	if (NF_CT_DIRECTION(hash))
-		return 0;
+		goto release;
 
 	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 	NF_CT_ASSERT(l3proto);
 	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 	NF_CT_ASSERT(l4proto);
 
+	ret = -ENOSPC;
 	if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 		       l3proto->name, nf_ct_l3num(ct),
 		       l4proto->name, nf_ct_protonum(ct),
 		       timer_pending(&ct->timeout)
 		       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
-		return -ENOSPC;
+		goto release;
 
 	if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
-		return -ENOSPC;
+		goto release;
 
 	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 			l3proto, l4proto))
-		return -ENOSPC;
+		goto release;
 
 	if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
-		return -ENOSPC;
+		goto release;
 
 	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 		if (seq_printf(s, "[UNREPLIED] "))
-			return -ENOSPC;
+			goto release;
 
 	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 			l3proto, l4proto))
-		return -ENOSPC;
+		goto release;
 
 	if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
-		return -ENOSPC;
+		goto release;
 
 	if (test_bit(IPS_ASSURED_BIT, &ct->status))
 		if (seq_printf(s, "[ASSURED] "))
-			return -ENOSPC;
+			goto release;
 
 #if defined(CONFIG_NF_CONNTRACK_MARK)
 	if (seq_printf(s, "mark=%u ", ct->mark))
-		return -ENOSPC;
+		goto release;
 #endif
 
 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 	if (seq_printf(s, "secmark=%u ", ct->secmark))
-		return -ENOSPC;
+		goto release;
 #endif
 
 	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
-		return -ENOSPC;
+		goto release;
 
+	ret = 0;
+release:
+	nf_ct_put(ct);
 	return 0;
 }
 

net/netfilter/xt_connlimit.c

···
 	const struct nf_conntrack_tuple_hash *found;
 	struct xt_connlimit_conn *conn;
 	struct xt_connlimit_conn *tmp;
-	const struct nf_conn *found_ct;
+	struct nf_conn *found_ct;
 	struct list_head *hash;
 	bool addit = true;
 	int matches = 0;
···
 
 	/* check the saved connections */
 	list_for_each_entry_safe(conn, tmp, hash, list) {
-		found    = __nf_conntrack_find(&init_net, &conn->tuple);
+		found    = nf_conntrack_find_get(&init_net, &conn->tuple);
 		found_ct = NULL;
 
 		if (found != NULL)
···
 			 * we do not care about connections which are
 			 * closed already -> ditch it
 			 */
+			nf_ct_put(found_ct);
 			list_del(&conn->list);
 			kfree(conn);
 			continue;
···
 		    match->family))
 			/* same source network -> be counted! */
 			++matches;
+		nf_ct_put(found_ct);
 	}
 
 	rcu_read_unlock();

net/netfilter/xt_physdev.c

···
 MODULE_ALIAS("ipt_physdev");
 MODULE_ALIAS("ip6t_physdev");
 
-static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
-{
-	const unsigned long *a = (const unsigned long *)_a;
-	const unsigned long *b = (const unsigned long *)_b;
-	const unsigned long *mask = (const unsigned long *)_mask;
-	unsigned long ret;
-
-	ret = (a[0] ^ b[0]) & mask[0];
-	if (IFNAMSIZ > sizeof(unsigned long))
-		ret |= (a[1] ^ b[1]) & mask[1];
-	if (IFNAMSIZ > 2 * sizeof(unsigned long))
-		ret |= (a[2] ^ b[2]) & mask[2];
-	if (IFNAMSIZ > 3 * sizeof(unsigned long))
-		ret |= (a[3] ^ b[3]) & mask[3];
-	BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
-	return ret;
-}
 
 static bool
 physdev_mt(const struct sk_buff *skb, const struct xt_match_param *par)
···
 	if (!(info->bitmask & XT_PHYSDEV_OP_IN))
 		goto match_outdev;
 	indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
-	ret = ifname_compare(indev, info->physindev, info->in_mask);
+	ret = ifname_compare_aligned(indev, info->physindev, info->in_mask);
 
 	if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN))
 		return false;
···
 		return true;
 	outdev = nf_bridge->physoutdev ?
 		 nf_bridge->physoutdev->name : nulldevname;
-	ret = ifname_compare(outdev, info->physoutdev, info->out_mask);
+	ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask);
 
 	return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT));
 }