X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fnetfilter%2Fnf_conntrack_core.c;h=8020db6274b86471149533b40eecd89c496c24d5;hb=04a2e6297df5ff04ddfbd6f2bdeefc218195ce96;hp=6aaf64b5dede89fa187fcc0103e440d74d39f47a;hpb=76108cea065cda58366d16a7eb6ca90d717a1396;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 6aaf64b..8020db6 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -29,6 +29,7 @@
 #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>
@@ -38,36 +39,30 @@
 #include <net/netfilter/nf_conntrack_core.h>
 #include <net/netfilter/nf_conntrack_extend.h>
 #include <net/netfilter/nf_conntrack_acct.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
 
 #define NF_CONNTRACK_VERSION	"0.5.0"
 
+int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
+				      enum nf_nat_manip_type manip,
+				      struct nlattr *attr) __read_mostly;
+EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
+
 DEFINE_SPINLOCK(nf_conntrack_lock);
 EXPORT_SYMBOL_GPL(nf_conntrack_lock);
 
-/* nf_conntrack_standalone needs this */
-atomic_t nf_conntrack_count = ATOMIC_INIT(0);
-EXPORT_SYMBOL_GPL(nf_conntrack_count);
-
 unsigned int nf_conntrack_htable_size __read_mostly;
 EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
 
-int nf_conntrack_max __read_mostly;
+unsigned int nf_conntrack_max __read_mostly;
 EXPORT_SYMBOL_GPL(nf_conntrack_max);
 
-struct hlist_head *nf_conntrack_hash __read_mostly;
-EXPORT_SYMBOL_GPL(nf_conntrack_hash);
-
 struct nf_conn nf_conntrack_untracked __read_mostly;
 EXPORT_SYMBOL_GPL(nf_conntrack_untracked);
 
-unsigned int nf_ct_log_invalid __read_mostly;
-HLIST_HEAD(unconfirmed);
-static int nf_conntrack_vmalloc __read_mostly;
 static struct kmem_cache *nf_conntrack_cachep __read_mostly;
 
-DEFINE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
-EXPORT_PER_CPU_SYMBOL(nf_conntrack_stat);
-
 static int nf_conntrack_hash_rnd_initted;
 static unsigned int nf_conntrack_hash_rnd;
 
@@ -169,8 +164,8 @@ static void
 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);
@@ -180,13 +175,15 @@ static void
 destroy_conntrack(struct nf_conntrack *nfct)
 {
 	struct nf_conn *ct = (struct nf_conn *)nfct;
+	struct net *net = nf_ct_net(ct);
 	struct nf_conntrack_l4proto *l4proto;
 
 	pr_debug("destroy_conntrack(%p)\n", ct);
 	NF_CT_ASSERT(atomic_read(&nfct->use) == 0);
 	NF_CT_ASSERT(!timer_pending(&ct->timeout));
 
-	nf_conntrack_event(IPCT_DESTROY, ct);
+	if (!test_bit(IPS_DYING_BIT, &ct->status))
+		nf_conntrack_event(IPCT_DESTROY, ct);
 	set_bit(IPS_DYING_BIT, &ct->status);
 
 	/* To make sure we don't get any weird locking issues here:
@@ -208,11 +205,11 @@ destroy_conntrack(struct nf_conntrack *nfct)
 
 	/* 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(delete);
+	NF_CT_STAT_INC(net, delete);
 	spin_unlock_bh(&nf_conntrack_lock);
 
 	if (ct->master)
@@ -225,6 +222,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
 static void death_by_timeout(unsigned long ul_conntrack)
 {
 	struct nf_conn *ct = (void *)ul_conntrack;
+	struct net *net = nf_ct_net(ct);
 	struct nf_conn_help *help = nfct_help(ct);
 	struct nf_conntrack_helper *helper;
 
@@ -239,31 +237,46 @@ static void death_by_timeout(unsigned long ul_conntrack)
 	spin_lock_bh(&nf_conntrack_lock);
 	/* Inside lock so preempt is disabled on module removal path.
 	 * Otherwise we can get spurious warnings. */
-	NF_CT_STAT_INC(delete_list);
+	NF_CT_STAT_INC(net, delete_list);
 	clean_from_lists(ct);
 	spin_unlock_bh(&nf_conntrack_lock);
 	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(const struct nf_conntrack_tuple *tuple)
+__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, &nf_conntrack_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(found);
+			NF_CT_STAT_INC(net, found);
 			local_bh_enable();
 			return h;
 		}
-		NF_CT_STAT_INC(searched);
+		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;
@@ -272,17 +285,24 @@ EXPORT_SYMBOL_GPL(__nf_conntrack_find);
 
 /* Find a connection corresponding to a tuple. */
 struct nf_conntrack_tuple_hash *
-nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple)
+nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conn *ct;
 
 	rcu_read_lock();
-	h = __nf_conntrack_find(tuple);
+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();
 
@@ -294,10 +314,12 @@ static void __nf_conntrack_hash_insert(struct nf_conn *ct,
 				       unsigned int hash,
 				       unsigned int repl_hash)
 {
-	hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
-			   &nf_conntrack_hash[hash]);
-	hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode,
-			   &nf_conntrack_hash[repl_hash]);
+	struct net *net = nf_ct_net(ct);
+
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
+			   &net->ct.hash[hash]);
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
+			   &net->ct.hash[repl_hash]);
 }
 
 void nf_conntrack_hash_insert(struct nf_conn *ct)
@@ -307,9 +329,7 @@ void nf_conntrack_hash_insert(struct nf_conn *ct)
 	hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 	repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 
-	spin_lock_bh(&nf_conntrack_lock);
 	__nf_conntrack_hash_insert(ct, hash, repl_hash);
-	spin_unlock_bh(&nf_conntrack_lock);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
 
@@ -321,10 +341,12 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	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;
 
 	ct = nf_ct_get(skb, &ctinfo);
+	net = nf_ct_net(ct);
 
 	/* ipt_REJECT uses nf_conntrack_attach to attach related
 	   ICMP/TCP RST packets in other direction.  Actual packet
@@ -351,17 +373,17 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	/* 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, &nf_conntrack_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, &nf_conntrack_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
@@ -371,22 +393,22 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	add_timer(&ct->timeout);
 	atomic_inc(&ct->ct_general.use);
 	set_bit(IPS_CONFIRMED_BIT, &ct->status);
-	NF_CT_STAT_INC(insert);
+	NF_CT_STAT_INC(net, insert);
 	spin_unlock_bh(&nf_conntrack_lock);
 	help = nfct_help(ct);
 	if (help && help->helper)
-		nf_conntrack_event_cache(IPCT_HELPER, skb);
+		nf_conntrack_event_cache(IPCT_HELPER, ct);
 #ifdef CONFIG_NF_NAT_NEEDED
 	if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) ||
 	    test_bit(IPS_DST_NAT_DONE_BIT, &ct->status))
-		nf_conntrack_event_cache(IPCT_NATINFO, skb);
+		nf_conntrack_event_cache(IPCT_NATINFO, ct);
 #endif
 	nf_conntrack_event_cache(master_ct(ct) ?
-				 IPCT_RELATED : IPCT_NEW, skb);
+				 IPCT_RELATED : IPCT_NEW, ct);
 	return NF_ACCEPT;
 
 out:
-	NF_CT_STAT_INC(insert_failed);
+	NF_CT_STAT_INC(net, insert_failed);
 	spin_unlock_bh(&nf_conntrack_lock);
 	return NF_DROP;
 }
@@ -398,22 +420,23 @@ int
 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
 			 const struct nf_conn *ignored_conntrack)
 {
+	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, &nf_conntrack_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(found);
+			NF_CT_STAT_INC(net, found);
 			rcu_read_unlock_bh();
 			return 1;
 		}
-		NF_CT_STAT_INC(searched);
+		NF_CT_STAT_INC(net, searched);
 	}
 	rcu_read_unlock_bh();
 
@@ -425,19 +448,19 @@ EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
 
 /* There's a small race here where we may free a just-assured
    connection.  Too bad: we're in trouble anyway. */
-static noinline int early_drop(unsigned int hash)
+static noinline int early_drop(struct net *net, unsigned int hash)
 {
 	/* 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, &nf_conntrack_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;
@@ -458,31 +481,33 @@ static noinline int early_drop(unsigned int hash)
 	if (del_timer(&ct->timeout)) {
 		death_by_timeout((unsigned long)ct);
 		dropped = 1;
-		NF_CT_STAT_INC_ATOMIC(early_drop);
+		NF_CT_STAT_INC_ATOMIC(net, early_drop);
 	}
 	nf_ct_put(ct);
 	return dropped;
 }
 
-struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
+struct nf_conn *nf_conntrack_alloc(struct net *net,
+				   const struct nf_conntrack_tuple *orig,
 				   const struct nf_conntrack_tuple *repl,
 				   gfp_t gfp)
 {
-	struct nf_conn *ct = NULL;
+	struct nf_conn *ct;
 
 	if (unlikely(!nf_conntrack_hash_rnd_initted)) {
-		get_random_bytes(&nf_conntrack_hash_rnd, 4);
+		get_random_bytes(&nf_conntrack_hash_rnd,
+				sizeof(nf_conntrack_hash_rnd));
 		nf_conntrack_hash_rnd_initted = 1;
 	}
 
 	/* We don't want any race condition at early drop stage */
-	atomic_inc(&nf_conntrack_count);
+	atomic_inc(&net->ct.count);
 
 	if (nf_conntrack_max &&
-	    unlikely(atomic_read(&nf_conntrack_count) > nf_conntrack_max)) {
+	    unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) {
 		unsigned int hash = hash_conntrack(orig);
-		if (!early_drop(hash)) {
-			atomic_dec(&nf_conntrack_count);
+		if (!early_drop(net, hash)) {
+			atomic_dec(&net->ct.count);
 			if (net_ratelimit())
 				printk(KERN_WARNING
 				       "nf_conntrack: table full, dropping"
@@ -494,7 +519,7 @@ struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
 	ct = kmem_cache_zalloc(nf_conntrack_cachep, gfp);
 	if (ct == NULL) {
 		pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n");
-		atomic_dec(&nf_conntrack_count);
+		atomic_dec(&net->ct.count);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -503,32 +528,30 @@ struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
 	ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
 	/* Don't set timer yet: wait for confirmation */
 	setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct);
-	INIT_RCU_HEAD(&ct->rcu);
+#ifdef CONFIG_NET_NS
+	ct->ct_net = net;
+#endif
 
 	return ct;
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
 
-static void nf_conntrack_free_rcu(struct rcu_head *head)
+void nf_conntrack_free(struct nf_conn *ct)
 {
-	struct nf_conn *ct = container_of(head, struct nf_conn, rcu);
+	struct net *net = nf_ct_net(ct);
 
+	nf_ct_ext_destroy(ct);
+	atomic_dec(&net->ct.count);
 	nf_ct_ext_free(ct);
 	kmem_cache_free(nf_conntrack_cachep, ct);
-	atomic_dec(&nf_conntrack_count);
-}
-
-void nf_conntrack_free(struct nf_conn *ct)
-{
-	nf_ct_ext_destroy(ct);
-	call_rcu(&ct->rcu, nf_conntrack_free_rcu);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_free);
 
 /* Allocate a new conntrack: we return -ENOMEM if classification
    failed due to stress.  Otherwise it really is unclassifiable. */
 static struct nf_conntrack_tuple_hash *
-init_conntrack(const struct nf_conntrack_tuple *tuple,
+init_conntrack(struct net *net,
+	       const struct nf_conntrack_tuple *tuple,
 	       struct nf_conntrack_l3proto *l3proto,
 	       struct nf_conntrack_l4proto *l4proto,
 	       struct sk_buff *skb,
@@ -544,8 +567,8 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
 		return NULL;
 	}
 
-	ct = nf_conntrack_alloc(tuple, &repl_tuple, GFP_ATOMIC);
-	if (ct == NULL || IS_ERR(ct)) {
+	ct = nf_conntrack_alloc(net, tuple, &repl_tuple, GFP_ATOMIC);
+	if (IS_ERR(ct)) {
 		pr_debug("Can't allocate conntrack.\n");
 		return (struct nf_conntrack_tuple_hash *)ct;
 	}
@@ -559,7 +582,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
 	nf_ct_acct_ext_add(ct, GFP_ATOMIC);
 
 	spin_lock_bh(&nf_conntrack_lock);
-	exp = nf_ct_find_expectation(tuple);
+	exp = nf_ct_find_expectation(net, tuple);
 	if (exp) {
 		pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
 			 ct, exp);
@@ -579,21 +602,15 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
 		ct->secmark = exp->master->secmark;
 #endif
 		nf_conntrack_get(&ct->master->ct_general);
-		NF_CT_STAT_INC(expect_new);
+		NF_CT_STAT_INC(net, expect_new);
 	} else {
-		struct nf_conntrack_helper *helper;
-
-		helper = __nf_ct_helper_find(&repl_tuple);
-		if (helper) {
-			help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
-			if (help)
-				rcu_assign_pointer(help->helper, helper);
-		}
-		NF_CT_STAT_INC(new);
+		__nf_ct_try_assign_helper(ct, GFP_ATOMIC);
+		NF_CT_STAT_INC(net, new);
 	}
 
 	/* Overload tuple linked list to put us in unconfirmed list. */
-	hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, &unconfirmed);
+	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
+		       &net->ct.unconfirmed);
 
 	spin_unlock_bh(&nf_conntrack_lock);
 
@@ -608,7 +625,8 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
 
 /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
 static inline struct nf_conn *
-resolve_normal_ct(struct sk_buff *skb,
+resolve_normal_ct(struct net *net,
+		  struct sk_buff *skb,
 		  unsigned int dataoff,
 		  u_int16_t l3num,
 		  u_int8_t protonum,
@@ -629,9 +647,9 @@ resolve_normal_ct(struct sk_buff *skb,
 	}
 
 	/* look for tuple match */
-	h = nf_conntrack_find_get(&tuple);
+	h = nf_conntrack_find_get(net, &tuple);
 	if (!h) {
-		h = init_conntrack(&tuple, l3proto, l4proto, skb, dataoff);
+		h = init_conntrack(net, &tuple, l3proto, l4proto, skb, dataoff);
 		if (!h)
 			return NULL;
 		if (IS_ERR(h))
@@ -665,7 +683,8 @@ resolve_normal_ct(struct sk_buff *skb,
 }
 
 unsigned int
-nf_conntrack_in(u_int8_t pf, unsigned int hooknum, struct sk_buff *skb)
+nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
+		struct sk_buff *skb)
 {
 	struct nf_conn *ct;
 	enum ip_conntrack_info ctinfo;
@@ -678,7 +697,7 @@ nf_conntrack_in(u_int8_t pf, unsigned int hooknum, struct sk_buff *skb)
 
 	/* Previously seen (loopback or untracked)?  Ignore. */
 	if (skb->nfct) {
-		NF_CT_STAT_INC_ATOMIC(ignore);
+		NF_CT_STAT_INC_ATOMIC(net, ignore);
 		return NF_ACCEPT;
 	}
 
@@ -688,8 +707,8 @@ nf_conntrack_in(u_int8_t pf, unsigned int hooknum, struct sk_buff *skb)
 				   &dataoff, &protonum);
 	if (ret <= 0) {
 		pr_debug("not prepared to track yet or error occured\n");
-		NF_CT_STAT_INC_ATOMIC(error);
-		NF_CT_STAT_INC_ATOMIC(invalid);
+		NF_CT_STAT_INC_ATOMIC(net, error);
+		NF_CT_STAT_INC_ATOMIC(net, invalid);
 		return -ret;
 	}
 
@@ -698,42 +717,46 @@ nf_conntrack_in(u_int8_t pf, unsigned int hooknum, struct sk_buff *skb)
 	/* It may be an special packet, error, unclean...
 	 * inverse of the return code tells to the netfilter
 	 * core what to do with the packet. */
-	if (l4proto->error != NULL &&
-	    (ret = l4proto->error(skb, dataoff, &ctinfo, pf, hooknum)) <= 0) {
-		NF_CT_STAT_INC_ATOMIC(error);
-		NF_CT_STAT_INC_ATOMIC(invalid);
-		return -ret;
+	if (l4proto->error != NULL) {
+		ret = l4proto->error(net, skb, dataoff, &ctinfo, pf, hooknum);
+		if (ret <= 0) {
+			NF_CT_STAT_INC_ATOMIC(net, error);
+			NF_CT_STAT_INC_ATOMIC(net, invalid);
+			return -ret;
+		}
 	}
 
-	ct = resolve_normal_ct(skb, dataoff, pf, protonum, l3proto, l4proto,
-			       &set_reply, &ctinfo);
+	ct = resolve_normal_ct(net, skb, dataoff, pf, protonum,
+			       l3proto, l4proto, &set_reply, &ctinfo);
 	if (!ct) {
 		/* Not valid part of a connection */
-		NF_CT_STAT_INC_ATOMIC(invalid);
+		NF_CT_STAT_INC_ATOMIC(net, invalid);
 		return NF_ACCEPT;
 	}
 
 	if (IS_ERR(ct)) {
 		/* Too stressed to deal. */
-		NF_CT_STAT_INC_ATOMIC(drop);
+		NF_CT_STAT_INC_ATOMIC(net, drop);
 		return NF_DROP;
 	}
 
 	NF_CT_ASSERT(skb->nfct);
 
 	ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum);
-	if (ret < 0) {
+	if (ret <= 0) {
 		/* Invalid: inverse of the return code tells
 		 * the netfilter core what to do */
 		pr_debug("nf_conntrack_in: Can't track with proto module\n");
 		nf_conntrack_put(skb->nfct);
 		skb->nfct = NULL;
-		NF_CT_STAT_INC_ATOMIC(invalid);
+		NF_CT_STAT_INC_ATOMIC(net, invalid);
+		if (ret == -NF_DROP)
+			NF_CT_STAT_INC_ATOMIC(net, drop);
 		return -ret;
 	}
 
 	if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
-		nf_conntrack_event_cache(IPCT_STATUS, skb);
+		nf_conntrack_event_cache(IPCT_STATUS, ct);
 
 	return ret;
 }
@@ -760,7 +783,6 @@ void nf_conntrack_alter_reply(struct nf_conn *ct,
 			      const struct nf_conntrack_tuple *newreply)
 {
 	struct nf_conn_help *help = nfct_help(ct);
-	struct nf_conntrack_helper *helper;
 
 	/* Should be unconfirmed, so not in hash table yet */
 	NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
@@ -773,23 +795,7 @@ void nf_conntrack_alter_reply(struct nf_conn *ct,
 		return;
 
 	rcu_read_lock();
-	helper = __nf_ct_helper_find(newreply);
-	if (helper == NULL) {
-		if (help)
-			rcu_assign_pointer(help->helper, NULL);
-		goto out;
-	}
-
-	if (help == NULL) {
-		help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
-		if (help == NULL)
-			goto out;
-	} else {
-		memset(&help->help, 0, sizeof(help->help));
-	}
-
-	rcu_assign_pointer(help->helper, helper);
-out:
+	__nf_ct_try_assign_helper(ct, GFP_ATOMIC);
 	rcu_read_unlock();
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
@@ -846,7 +852,7 @@ acct:
 
 	/* must be unlocked when calling event cache */
 	if (event)
-		nf_conntrack_event_cache(event, skb);
+		nf_conntrack_event_cache(event, ct);
 }
 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
 
@@ -915,6 +921,12 @@ int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
 	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. */
@@ -938,22 +950,22 @@ static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
 
 /* Bring out ya dead! */
 static struct nf_conn *
-get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
+get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data),
 		void *data, unsigned int *bucket)
 {
 	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, &nf_conntrack_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, &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);
@@ -966,13 +978,14 @@ found:
 	return ct;
 }
 
-void
-nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data)
+void nf_ct_iterate_cleanup(struct net *net,
+			   int (*iter)(struct nf_conn *i, void *data),
+			   void *data)
 {
 	struct nf_conn *ct;
 	unsigned int bucket = 0;
 
-	while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) {
+	while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) {
 		/* Time to push up daises... */
 		if (del_timer(&ct->timeout))
 			death_by_timeout((unsigned long)ct);
@@ -983,12 +996,24 @@ nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data)
 }
 EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup);
 
+struct __nf_ct_flush_report {
+	u32 pid;
+	int report;
+};
+
 static int kill_all(struct nf_conn *i, void *data)
 {
+	struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data;
+
+	/* get_next_corpse sets the dying bit for us */
+	nf_conntrack_event_report(IPCT_DESTROY,
+				  i,
+				  fr->pid,
+				  fr->report);
 	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);
@@ -998,27 +1023,30 @@ void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, unsigned int s
 }
 EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
 
-void nf_conntrack_flush(void)
+void nf_conntrack_flush(struct net *net, u32 pid, int report)
 {
-	nf_ct_iterate_cleanup(kill_all, NULL);
+	struct __nf_ct_flush_report fr = {
+		.pid 	= pid,
+		.report = report,
+	};
+	nf_ct_iterate_cleanup(net, kill_all, &fr);
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_flush);
 
-/* Mishearing the voices in his head, our hero wonders how he's
-   supposed to kill the mall. */
-void nf_conntrack_cleanup(void)
+static void nf_conntrack_cleanup_init_net(void)
 {
-	rcu_assign_pointer(ip_ct_attach, NULL);
-
-	/* This makes sure all current packets have passed through
-	   netfilter framework.  Roll on, two-stage module
-	   delete... */
-	synchronize_net();
+	nf_conntrack_helper_fini();
+	nf_conntrack_proto_fini();
+	kmem_cache_destroy(nf_conntrack_cachep);
+}
 
-	nf_ct_event_cache_flush();
+static void nf_conntrack_cleanup_net(struct net *net)
+{
+	nf_ct_event_cache_flush(net);
+	nf_conntrack_ecache_fini(net);
  i_see_dead_people:
-	nf_conntrack_flush();
-	if (atomic_read(&nf_conntrack_count) != 0) {
+	nf_conntrack_flush(net, 0, 0);
+	if (atomic_read(&net->ct.count) != 0) {
 		schedule();
 		goto i_see_dead_people;
 	}
@@ -1026,38 +1054,55 @@ void nf_conntrack_cleanup(void)
 	while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1)
 		schedule();
 
-	rcu_assign_pointer(nf_ct_destroy, NULL);
-
-	kmem_cache_destroy(nf_conntrack_cachep);
-	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc,
+	nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
 			     nf_conntrack_htable_size);
+	nf_conntrack_acct_fini(net);
+	nf_conntrack_expect_fini(net);
+	free_percpu(net->ct.stat);
+}
 
-	nf_conntrack_acct_fini();
-	nf_conntrack_expect_fini();
-	nf_conntrack_helper_fini();
-	nf_conntrack_proto_fini();
+/* Mishearing the voices in his head, our hero wonders how he's
+   supposed to kill the mall. */
+void nf_conntrack_cleanup(struct net *net)
+{
+	if (net_eq(net, &init_net))
+		rcu_assign_pointer(ip_ct_attach, NULL);
+
+	/* This makes sure all current packets have passed through
+	   netfilter framework.  Roll on, two-stage module
+	   delete... */
+	synchronize_net();
+
+	nf_conntrack_cleanup_net(net);
+
+	if (net_eq(net, &init_net)) {
+		rcu_assign_pointer(nf_ct_destroy, NULL);
+		nf_conntrack_cleanup_init_net();
+	}
 }
 
-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;
 }
@@ -1068,7 +1113,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 	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. */
@@ -1079,13 +1124,13 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 	if (!hashsize)
 		return -EINVAL;
 
-	hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced);
+	hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1);
 	if (!hash)
 		return -ENOMEM;
 
 	/* We have to rehahs for the new table anyway, so we also can
 	 * use a newrandom seed */
-	get_random_bytes(&rnd, 4);
+	get_random_bytes(&rnd, sizeof(rnd));
 
 	/* Lookups in the old hash might happen in parallel, which means we
 	 * might get false negatives during connection lookup. New connections
@@ -1094,21 +1139,21 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 	 */
 	spin_lock_bh(&nf_conntrack_lock);
 	for (i = 0; i < nf_conntrack_htable_size; i++) {
-		while (!hlist_empty(&nf_conntrack_hash[i])) {
-			h = hlist_entry(nf_conntrack_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;
-	old_vmalloced = nf_conntrack_vmalloc;
-	old_hash = nf_conntrack_hash;
+	old_vmalloced = init_net.ct.hash_vmalloc;
+	old_hash = init_net.ct.hash;
 
 	nf_conntrack_htable_size = hashsize;
-	nf_conntrack_vmalloc = vmalloced;
-	nf_conntrack_hash = hash;
+	init_net.ct.hash_vmalloc = vmalloced;
+	init_net.ct.hash = hash;
 	nf_conntrack_hash_rnd = rnd;
 	spin_unlock_bh(&nf_conntrack_lock);
 
@@ -1120,7 +1165,7 @@ EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize);
 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
 		  &nf_conntrack_htable_size, 0600);
 
-int __init nf_conntrack_init(void)
+static int nf_conntrack_init_init_net(void)
 {
 	int max_factor = 8;
 	int ret;
@@ -1142,13 +1187,6 @@ int __init nf_conntrack_init(void)
 		 * entries. */
 		max_factor = 4;
 	}
-	nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
-						  &nf_conntrack_vmalloc);
-	if (!nf_conntrack_hash) {
-		printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
-		goto err_out;
-	}
-
 	nf_conntrack_max = max_factor * nf_conntrack_htable_size;
 
 	printk("nf_conntrack version %s (%u buckets, %d max)\n",
@@ -1157,51 +1195,106 @@ int __init nf_conntrack_init(void)
 
 	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");
-		goto err_free_hash;
+		ret = -ENOMEM;
+		goto err_cache;
 	}
 
 	ret = nf_conntrack_proto_init();
 	if (ret < 0)
-		goto err_free_conntrack_slab;
-
-	ret = nf_conntrack_expect_init();
-	if (ret < 0)
-		goto out_fini_proto;
+		goto err_proto;
 
 	ret = nf_conntrack_helper_init();
 	if (ret < 0)
-		goto out_fini_expect;
+		goto err_helper;
 
-	ret = nf_conntrack_acct_init();
-	if (ret < 0)
-		goto out_fini_helper;
+	return 0;
+
+err_helper:
+	nf_conntrack_proto_fini();
+err_proto:
+	kmem_cache_destroy(nf_conntrack_cachep);
+err_cache:
+	return ret;
+}
+
+static int nf_conntrack_init_net(struct net *net)
+{
+	int ret;
 
-	/* For use by REJECT target */
-	rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach);
-	rcu_assign_pointer(nf_ct_destroy, destroy_conntrack);
+	atomic_set(&net->ct.count, 0);
+	INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0);
+	net->ct.stat = alloc_percpu(struct ip_conntrack_stat);
+	if (!net->ct.stat) {
+		ret = -ENOMEM;
+		goto err_stat;
+	}
+	ret = nf_conntrack_ecache_init(net);
+	if (ret < 0)
+		goto err_ecache;
+	net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
+					     &net->ct.hash_vmalloc, 1);
+	if (!net->ct.hash) {
+		ret = -ENOMEM;
+		printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
+		goto err_hash;
+	}
+	ret = nf_conntrack_expect_init(net);
+	if (ret < 0)
+		goto err_expect;
+	ret = nf_conntrack_acct_init(net);
+	if (ret < 0)
+		goto err_acct;
 
 	/* Set up fake conntrack:
 	    - to never be deleted, not in any hashes */
+#ifdef CONFIG_NET_NS
+	nf_conntrack_untracked.ct_net = &init_net;
+#endif
 	atomic_set(&nf_conntrack_untracked.ct_general.use, 1);
 	/*  - and look it like as a confirmed connection */
 	set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status);
 
-	return ret;
+	return 0;
 
-out_fini_helper:
-	nf_conntrack_helper_fini();
-out_fini_expect:
-	nf_conntrack_expect_fini();
-out_fini_proto:
-	nf_conntrack_proto_fini();
-err_free_conntrack_slab:
-	kmem_cache_destroy(nf_conntrack_cachep);
-err_free_hash:
-	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc,
+err_acct:
+	nf_conntrack_expect_fini(net);
+err_expect:
+	nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc,
 			     nf_conntrack_htable_size);
-err_out:
-	return -ENOMEM;
+err_hash:
+	nf_conntrack_ecache_fini(net);
+err_ecache:
+	free_percpu(net->ct.stat);
+err_stat:
+	return ret;
+}
+
+int nf_conntrack_init(struct net *net)
+{
+	int ret;
+
+	if (net_eq(net, &init_net)) {
+		ret = nf_conntrack_init_init_net();
+		if (ret < 0)
+			goto out_init_net;
+	}
+	ret = nf_conntrack_init_net(net);
+	if (ret < 0)
+		goto out_net;
+
+	if (net_eq(net, &init_net)) {
+		/* For use by REJECT target */
+		rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach);
+		rcu_assign_pointer(nf_ct_destroy, destroy_conntrack);
+	}
+	return 0;
+
+out_net:
+	if (net_eq(net, &init_net))
+		nf_conntrack_cleanup_init_net();
+out_init_net:
+	return ret;
 }