Some sysctl variables are used to tune the frag queues
management and it will be useful to work with them in
a common way in the future, so move them into one
structure, moreover they are the same for all the frag
management codes.

I don't place them in the existing inet_frags object,
introduced in the previous patch for two reasons:

 1. to keep them in the __read_mostly section;
 2. not to export the whole inet_frags objects outside.

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

---

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index d51f238..ada03ba 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -20,6 +20,13 @@ struct inet_frag_queue {
 
 #define INETFRAGS_HASHSZ		64
 
+struct inet_frags_ctl {
+	int high_thresh;
+	int low_thresh;
+	int timeout;
+	int secret_interval;
+};
+
 struct inet_frags {
 	struct list_head	lru_list;
 	struct hlist_head	hash[INETFRAGS_HASHSZ];
@@ -28,6 +35,7 @@ struct inet_frags {
 	int			nqueues;
 	atomic_t		mem;
 	struct timer_list	secret_timer;
+	struct inet_frags_ctl	*ctl;
 };
 
 void inet_frags_init(struct inet_frags *);
diff --git a/include/net/ip.h b/include/net/ip.h
index a18dcec..e7b0feb 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -177,10 +177,8 @@ extern int sysctl_ip_default_ttl;
 extern int sysctl_ip_nonlocal_bind;
 
 /* From ip_fragment.c */
-extern int sysctl_ipfrag_high_thresh; 
-extern int sysctl_ipfrag_low_thresh;
-extern int sysctl_ipfrag_time;
-extern int sysctl_ipfrag_secret_interval;
+struct inet_frags_ctl;
+extern struct inet_frags_ctl ip4_frags_ctl;
 extern int sysctl_ipfrag_max_dist;
 
 /* From inetpeer.c */
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 77cdab3..b29d76c 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -565,10 +565,8 @@ extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 /*
  * reassembly.c
  */
-extern int sysctl_ip6frag_high_thresh;
-extern int sysctl_ip6frag_low_thresh;
-extern int sysctl_ip6frag_time;
-extern int sysctl_ip6frag_secret_interval;
+struct inet_frags_ctl;
+extern struct inet_frags_ctl ip6_frags_ctl;
 
 extern const struct proto_ops inet6_stream_ops;
 extern const struct proto_ops inet6_dgram_ops;
diff --git a/include/net/netfilter/ipv6/nf_conntrack_ipv6.h b/include/net/netfilter/ipv6/nf_conntrack_ipv6.h
index 070d12c..f703533 100644
--- a/include/net/netfilter/ipv6/nf_conntrack_ipv6.h
+++ b/include/net/netfilter/ipv6/nf_conntrack_ipv6.h
@@ -15,8 +15,7 @@ extern void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb,
 			       struct net_device *out,
 			       int (*okfn)(struct sk_buff *));
 
-extern unsigned int nf_ct_frag6_timeout;
-extern unsigned int nf_ct_frag6_low_thresh;
-extern unsigned int nf_ct_frag6_high_thresh;
+struct inet_frags_ctl;
+extern struct inet_frags_ctl nf_frags_ctl;
 
 #endif /* _NF_CONNTRACK_IPV6_H*/
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 5e1667e..61035a8 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -50,21 +50,8 @@
  * as well. Or notify me, at least. --ANK
  */
 
-/* Fragment cache limits. We will commit 256K at one time. Should we
- * cross that limit we will prune down to 192K. This should cope with
- * even the most extreme cases without allowing an attacker to measurably
- * harm machine performance.
- */
-int sysctl_ipfrag_high_thresh __read_mostly = 256*1024;
-int sysctl_ipfrag_low_thresh __read_mostly = 192*1024;
-
 int sysctl_ipfrag_max_dist __read_mostly = 64;
 
-/* Important NOTE! Fragment queue must be destroyed before MSL expires.
- * RFC791 is wrong proposing to prolongate timer each fragment arrival by TTL.
- */
-int sysctl_ipfrag_time __read_mostly = IP_FRAG_TIME;
-
 struct ipfrag_skb_cb
 {
 	struct inet_skb_parm	h;
@@ -87,6 +74,25 @@ struct ipq {
 	struct inet_peer *peer;
 };
 
+struct inet_frags_ctl ip4_frags_ctl __read_mostly = {
+	/*
+	 * Fragment cache limits. We will commit 256K at one time. Should we
+	 * cross that limit we will prune down to 192K. This should cope with
+	 * even the most extreme cases without allowing an attacker to
+	 * measurably harm machine performance.
+	 */
+	.high_thresh	 = 256 * 1024,
+	.low_thresh	 = 192 * 1024,
+
+	/*
+	 * Important NOTE! Fragment queue must be destroyed before MSL expires.
+	 * RFC791 is wrong proposing to prolongate timer each fragment arrival
+	 * by TTL.
+	 */
+	.timeout	 = IP_FRAG_TIME,
+	.secret_interval = 10 * 60 * HZ,
+};
+
 static struct inet_frags ip4_frags;
 
 int ip_frag_nqueues(void)
@@ -120,8 +126,6 @@ static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
 			    ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);
 }
 
-int sysctl_ipfrag_secret_interval __read_mostly = 10 * 60 * HZ;
-
 static void ipfrag_secret_rebuild(unsigned long dummy)
 {
 	unsigned long now = jiffies;
@@ -147,7 +151,7 @@ static void ipfrag_secret_rebuild(unsigned long dummy)
 	}
 	write_unlock(&ip4_frags.lock);
 
-	mod_timer(&ip4_frags.secret_timer, now + sysctl_ipfrag_secret_interval);
+	mod_timer(&ip4_frags.secret_timer, now + ip4_frags_ctl.secret_interval);
 }
 
 /* Memory Tracking Functions. */
@@ -234,7 +238,7 @@ static void ip_evictor(void)
 	struct list_head *tmp;
 	int work;
 
-	work = atomic_read(&ip4_frags.mem) - sysctl_ipfrag_low_thresh;
+	work = atomic_read(&ip4_frags.mem) - ip4_frags_ctl.low_thresh;
 	if (work <= 0)
 		return;
 
@@ -323,7 +327,7 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in)
 #endif
 	qp = qp_in;
 
-	if (!mod_timer(&qp->q.timer, jiffies + sysctl_ipfrag_time))
+	if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout))
 		atomic_inc(&qp->q.refcnt);
 
 	atomic_inc(&qp->q.refcnt);
@@ -429,7 +433,7 @@ static int ip_frag_reinit(struct ipq *qp)
 {
 	struct sk_buff *fp;
 
-	if (!mod_timer(&qp->q.timer, jiffies + sysctl_ipfrag_time)) {
+	if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout)) {
 		atomic_inc(&qp->q.refcnt);
 		return -ETIMEDOUT;
 	}
@@ -693,7 +697,7 @@ struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user)
 	IP_INC_STATS_BH(IPSTATS_MIB_REASMREQDS);
 
 	/* Start by cleaning up the memory. */
-	if (atomic_read(&ip4_frags.mem) > sysctl_ipfrag_high_thresh)
+	if (atomic_read(&ip4_frags.mem) > ip4_frags_ctl.high_thresh)
 		ip_evictor();
 
 	dev = skb->dev;
@@ -724,9 +728,10 @@ void __init ipfrag_init(void)
 {
 	init_timer(&ip4_frags.secret_timer);
 	ip4_frags.secret_timer.function = ipfrag_secret_rebuild;
-	ip4_frags.secret_timer.expires = jiffies + sysctl_ipfrag_secret_interval;
+	ip4_frags.secret_timer.expires = jiffies + ip4_frags_ctl.secret_interval;
 	add_timer(&ip4_frags.secret_timer);
 
+	ip4_frags.ctl = &ip4_frags_ctl;
 	inet_frags_init(&ip4_frags);
 }
 
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index eb286ab..c98ef16 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -19,6 +19,7 @@
 #include <net/route.h>
 #include <net/tcp.h>
 #include <net/cipso_ipv4.h>
+#include <net/inet_frag.h>
 
 /* From af_inet.c */
 extern int sysctl_ip_nonlocal_bind;
@@ -357,7 +358,7 @@ ctl_table ipv4_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_HIGH_THRESH,
 		.procname	= "ipfrag_high_thresh",
-		.data		= &sysctl_ipfrag_high_thresh,
+		.data		= &ip4_frags_ctl.high_thresh,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec
@@ -365,7 +366,7 @@ ctl_table ipv4_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_LOW_THRESH,
 		.procname	= "ipfrag_low_thresh",
-		.data		= &sysctl_ipfrag_low_thresh,
+		.data		= &ip4_frags_ctl.low_thresh,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec
@@ -381,7 +382,7 @@ ctl_table ipv4_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_TIME,
 		.procname	= "ipfrag_time",
-		.data		= &sysctl_ipfrag_time,
+		.data		= &ip4_frags_ctl.timeout,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -732,7 +733,7 @@ ctl_table ipv4_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_SECRET_INTERVAL,
 		.procname	= "ipfrag_secret_interval",
-		.data		= &sysctl_ipfrag_secret_interval,
+		.data		= &ip4_frags_ctl.secret_interval,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 37a3db9..572c0bc 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -18,6 +18,7 @@
 #include <linux/icmp.h>
 #include <linux/sysctl.h>
 #include <net/ipv6.h>
+#include <net/inet_frag.h>
 
 #include <linux/netfilter_ipv6.h>
 #include <net/netfilter/nf_conntrack.h>
@@ -307,7 +308,7 @@ static ctl_table nf_ct_ipv6_sysctl_table[] = {
 	{
 		.ctl_name	= NET_NF_CONNTRACK_FRAG6_TIMEOUT,
 		.procname	= "nf_conntrack_frag6_timeout",
-		.data		= &nf_ct_frag6_timeout,
+		.data		= &nf_frags_ctl.timeout,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -315,7 +316,7 @@ static ctl_table nf_ct_ipv6_sysctl_table[] = {
 	{
 		.ctl_name	= NET_NF_CONNTRACK_FRAG6_LOW_THRESH,
 		.procname	= "nf_conntrack_frag6_low_thresh",
-		.data		= &nf_ct_frag6_low_thresh,
+		.data		= &nf_frags_ctl.low_thresh,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
@@ -323,7 +324,7 @@ static ctl_table nf_ct_ipv6_sysctl_table[] = {
 	{
 		.ctl_name	= NET_NF_CONNTRACK_FRAG6_HIGH_THRESH,
 		.procname	= "nf_conntrack_frag6_high_thresh",
-		.data		= &nf_ct_frag6_high_thresh,
+		.data		= &nf_frags_ctl.high_thresh,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
diff --git a/net/ipv6/netfilter