There are some objects that are common in all the places
which are used to keep track of frag queues, they are:

 * hash table
 * LRU list
 * rw lock
 * rnd number for hash function
 * the number of queues
 * the amount of memory occupied by queues
 * secret timer

Move all this stuff into one structure (struct inet_frags)
to make it possible use them uniformly in the future. Like
with the previous patch this mostly consists of hunks like

-    write_lock(&ipfrag_lock);
+    write_lock(&ip4_frags.lock);

To address the issue with exporting the number of queues and 
the amount of memory occupied by queues outside the .c file
they are declared in, I introduce a couple of helpers.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>

---

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 74e9cb9..d51f238 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -18,4 +18,19 @@ struct inet_frag_queue {
 #define LAST_IN			1
 };
 
+#define INETFRAGS_HASHSZ		64
+
+struct inet_frags {
+	struct list_head	lru_list;
+	struct hlist_head	hash[INETFRAGS_HASHSZ];
+	rwlock_t		lock;
+	u32			rnd;
+	int			nqueues;
+	atomic_t		mem;
+	struct timer_list	secret_timer;
+};
+
+void inet_frags_init(struct inet_frags *);
+void inet_frags_fini(struct inet_frags *);
+
 #endif
diff --git a/include/net/ip.h b/include/net/ip.h
index 3af3ed9..a18dcec 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -333,8 +333,8 @@ enum ip_defrag_users
 };
 
 struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user);
-extern int ip_frag_nqueues;
-extern atomic_t ip_frag_mem;
+int ip_frag_mem(void);
+int ip_frag_nqueues(void);
 
 /*
  *	Functions provided by ip_forward.c
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 31b3f1b..77cdab3 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -252,8 +252,8 @@ struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 
 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 
-extern int ip6_frag_nqueues;
-extern atomic_t ip6_frag_mem;
+int ip6_frag_nqueues(void);
+int ip6_frag_mem(void);
 
 #define IPV6_FRAG_TIMEOUT	(60*HZ)		/* 60 seconds */
 
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index a02c36d..93fe396 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -10,7 +10,8 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     tcp_minisocks.o tcp_cong.o \
 	     datagram.o raw.o udp.o udplite.o \
 	     arp.o icmp.o devinet.o af_inet.o  igmp.o \
-	     sysctl_net_ipv4.o fib_frontend.o fib_semantics.o
+	     sysctl_net_ipv4.o fib_frontend.o fib_semantics.o \
+	     inet_fragment.o
 
 obj-$(CONFIG_IP_FIB_HASH) += fib_hash.o
 obj-$(CONFIG_IP_FIB_TRIE) += fib_trie.o
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
new file mode 100644
index 0000000..69623ff
--- /dev/null
+++ b/net/ipv4/inet_fragment.c
@@ -0,0 +1,44 @@
+/*
+ * inet fragments management
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * 		Authors:	Pavel Emelyanov <xemul@openvz.org>
+ *				Started as consolidation of ipv4/ip_fragment.c,
+ *				ipv6/reassembly. and ipv6 nf conntrack reassembly
+ */
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+
+#include <net/inet_frag.h>
+
+void inet_frags_init(struct inet_frags *f)
+{
+	int i;
+
+	for (i = 0; i < INETFRAGS_HASHSZ; i++)
+		INIT_HLIST_HEAD(&f->hash[i]);
+
+	INIT_LIST_HEAD(&f->lru_list);
+	rwlock_init(&f->lock);
+
+	f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
+				   (jiffies ^ (jiffies >> 6)));
+
+	f->nqueues = 0;
+	atomic_set(&f->mem, 0);
+
+}
+EXPORT_SYMBOL(inet_frags_init);
+
+void inet_frags_fini(struct inet_frags *f)
+{
+}
+EXPORT_SYMBOL(inet_frags_fini);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 3eb1b6d..5e1667e 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -87,39 +87,39 @@ struct ipq {
 	struct inet_peer *peer;
 };
 
-/* Hash table. */
+static struct inet_frags ip4_frags;
 
-#define IPQ_HASHSZ	64
+int ip_frag_nqueues(void)
+{
+	return ip4_frags.nqueues;
+}
 
-/* Per-bucket lock is easy to add now. */
-static struct hlist_head ipq_hash[IPQ_HASHSZ];
-static DEFINE_RWLOCK(ipfrag_lock);
-static u32 ipfrag_hash_rnd;
-static LIST_HEAD(ipq_lru_list);
-int ip_frag_nqueues = 0;
+int ip_frag_mem(void)
+{
+	return atomic_read(&ip4_frags.mem);
+}
 
 static __inline__ void __ipq_unlink(struct ipq *qp)
 {
 	hlist_del(&qp->q.list);
 	list_del(&qp->q.lru_list);
-	ip_frag_nqueues--;
+	ip4_frags.nqueues--;
 }
 
 static __inline__ void ipq_unlink(struct ipq *ipq)
 {
-	write_lock(&ipfrag_lock);
+	write_lock(&ip4_frags.lock);
 	__ipq_unlink(ipq);
-	write_unlock(&ipfrag_lock);
+	write_unlock(&ip4_frags.lock);
 }
 
 static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
 {
 	return jhash_3words((__force u32)id << 16 | prot,
 			    (__force u32)saddr, (__force u32)daddr,
-			    ipfrag_hash_rnd) & (IPQ_HASHSZ - 1);
+			    ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);
 }
 
-static struct timer_list ipfrag_secret_timer;
 int sysctl_ipfrag_secret_interval __read_mostly = 10 * 60 * HZ;
 
 static void ipfrag_secret_rebuild(unsigned long dummy)
@@ -127,13 +127,13 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
 	unsigned long now = jiffies;
 	int i;
 
-	write_lock(&ipfrag_lock);
-	get_random_bytes(&ipfrag_hash_rnd, sizeof(u32));
-	for (i = 0; i < IPQ_HASHSZ; i++) {
+	write_lock(&ip4_frags.lock);
+	get_random_bytes(&ip4_frags.rnd, sizeof(u32));
+	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
 		struct ipq *q;
 		struct hlist_node *p, *n;
 
-		hlist_for_each_entry_safe(q, p, n, &ipq_hash[i], q.list) {
+		hlist_for_each_entry_safe(q, p, n, &ip4_frags.hash[i], q.list) {
 			unsigned int hval = ipqhashfn(q->id, q->saddr,
 						      q->daddr, q->protocol);
 
@@ -141,23 +141,21 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
 				hlist_del(&q->q.list);
 
 				/* Relink to new hash chain. */
-				hlist_add_head(&q->q.list, &ipq_hash[hval]);
+				hlist_add_head(&q->q.list, &ip4_frags.hash[hval]);
 			}
 		}
 	}
-	write_unlock(&ipfrag_lock);
+	write_unlock(&ip4_frags.lock);
 
-	mod_timer(&ipfrag_secret_timer, now + sysctl_ipfrag_secret_interval);
+	mod_timer(&ip4_frags.secret_timer, now + sysctl_ipfrag_secret_interval);
 }
 
-atomic_t ip_frag_mem = ATOMIC_INIT(0);	/* Memory used for fragments */
-
 /* Memory Tracking Functions. */
 static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
 	if (work)
 		*work -= skb->truesize;
-	atomic_sub(skb->truesize, &ip_frag_mem);
+	atomic_sub(skb->truesize, &ip4_frags.mem);
 	kfree_skb(skb);
 }
 
@@ -165,7 +163,7 @@ static __inline__ void frag_free_queue(struct ipq *qp, int *work)
 {
 	if (work)
 		*work -= sizeof(struct ipq);
-	atomic_sub(sizeof(struct ipq), &ip_frag_mem);
+	atomic_sub(sizeof(struct ipq), &ip4_frags.mem);
 	kfree(qp);
 }
 
@@ -175,7 +173,7 @@ static __inline__ struct ipq *frag_alloc_queue(void)
 
 	if (!qp)
 		return NULL;
-	atomic_add(sizeof(struct ipq), &ip_frag_mem);
+	atomic_add(sizeof(struct ipq), &ip4_frags.mem);
 	return qp;
 }
 
@@ -236,20 +234,20 @@ static void ip_evictor(void)
 	struct list_head *tmp;
 	int work;
 
-	work = atomic_read(&ip_frag_mem) - sysctl_ipfrag_low_thresh;
+	work = atomic_read(&ip4_frags.mem) - sysctl_ipfrag_low_thresh;
 	if (work <= 0)
 		return;
 
 	while (work > 0) {
-		read_lock(&ipfrag_lock);
-		if (list_empty(&ipq_lru_list)) {
-			read_unlock(&ipfrag_lock);
+		read_lock(&ip4_frags.lock);
+		if (list_empty(&ip4_frags.lru_list)) {
+			read_unlock(&ip4_frags.lock);
 			return;
 		}
-		tmp = ipq_lru_list.next;
+		tmp = ip4_frags.lru_list.next;
 		qp = list_entry(tmp, struct ipq, q.lru_list);
 		atomic_inc(&qp->q.refcnt);
-		read_unlock(&ipfrag_lock);
+		read_unlock(&ip4_frags.lock);
 
 		spin_lock(&qp->q.lock);
 		if (!(qp->q.last_in&COMPLETE))
@@ -301,7 +299,7 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
 #endif
 	unsigned int hash;
 
-	write_lock(&ipfrag_lock);
+	write_lock(&ip4_frags.lock);
 	hash = ipqhashfn(qp_in->id, qp_in->saddr, qp_in->daddr,
 			 qp_in->protocol);
 #ifdef CONFIG_SMP
@@ -309,14 +307,14 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
 	 * such entry could be created on other cpu, while we
 	 * promoted read lock to write lock.
 	 */
-	hlist_for_each_entry(qp, n, &ipq_hash[hash], q.list) {
+	hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) {
 		if (qp->id == qp_in->id		&&
 		    qp->saddr == qp_in->saddr	&&
 		    qp->daddr == qp_in->daddr	&&
 		    qp->protocol == qp_in->protocol &&
 		    qp->user == qp_in->user) {
 			atomic_inc(&qp->q.refcnt);
-			write_unlock(&ipfrag_lock);
+			write_unlock(&ip4_frags.lock);
 			qp_in->q.last_in |= COMPLETE;
 			ipq_put(qp_in, NULL);
 			return qp;
@@ -329,11 +327,11 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
 		atomic_inc(&qp->q.refcnt);
 
 	atomic_inc(&qp->q.refcnt);
-	hlist_add_head(&qp->q.list, &ipq_hash[hash]);
+	hlist_add_head(&qp->q.list, &ip4_frags.hash[hash]);
 	INIT_LIST_HEAD(&qp->q.lru_list);
-	list_add_tail(&qp->q.lru_list, &ipq_lru_list);
-	ip_frag_nqueues++;
-	write_unlock(&ipfrag_lock);
+	list_add_tail(&qp->q.lru_list, &ip4_frags.lru_list);
+	ip4_frags.nqueues++;
+	write_unlock(&ip4_frags.lock);
 	retu