[NETNS][FRAGS]: Isolate the secret interval from namespaces.

Since we have one hashtable to lookup the fragment, having
different secret_interval-s for hash rebuild doesn't make
sense, so move this one to inet_frags.

The inet_frags_ctl becomes empty after this, so remove it.
The appropriate ctl table is kept read-only in namespaces.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -31,18 +31,14 @@ struct inet_frag_queue {
 
 #define INETFRAGS_HASHSZ		64
 
-struct inet_frags_ctl {
-	int secret_interval;
-};
-
 struct inet_frags {
 	struct list_head	lru_list;
 	struct hlist_head	hash[INETFRAGS_HASHSZ];
 	rwlock_t		lock;
 	u32			rnd;
 	int			qsize;
+	int			secret_interval;
 	struct timer_list	secret_timer;
-	struct inet_frags_ctl	*ctl;
 
 	unsigned int		(*hashfn)(struct inet_frag_queue *);
 	void			(*constructor)(struct inet_frag_queue *q,

include/net/netns/ipv6.h

@@ -14,7 +14,6 @@ struct netns_sysctl_ipv6 {
 	struct ctl_table_header *table;
 	struct ctl_table_header *frags_hdr;
 #endif
-	struct inet_frags_ctl frags;
 	int bindv6only;
 	int flush_delay;
 	int ip6_rt_max_size;

net/ipv4/inet_fragment.c

@@ -47,7 +47,7 @@ static void inet_frag_secret_rebuild(unsigned long dummy)
 	}
 	write_unlock(&f->lock);
 
-	mod_timer(&f->secret_timer, now + f->ctl->secret_interval);
+	mod_timer(&f->secret_timer, now + f->secret_interval);
 }
 
 void inet_frags_init(struct inet_frags *f)
@@ -65,7 +65,7 @@ void inet_frags_init(struct inet_frags *f)
 
 	setup_timer(&f->secret_timer, inet_frag_secret_rebuild,
 			(unsigned long)f);
-	f->secret_timer.expires = jiffies + f->ctl->secret_interval;
+	f->secret_timer.expires = jiffies + f->secret_interval;
 	add_timer(&f->secret_timer);
 }
 EXPORT_SYMBOL(inet_frags_init);

net/ipv4/ip_fragment.c

@@ -74,10 +74,6 @@ struct ipq {
 	struct inet_peer *peer;
 };
 
-static struct inet_frags_ctl ip4_frags_ctl __read_mostly = {
-	.secret_interval = 10 * 60 * HZ,
-};
-
 static struct inet_frags ip4_frags;
 
 int ip_frag_nqueues(struct net *net)
@@ -627,7 +623,7 @@ static struct ctl_table ip4_frags_ctl_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_SECRET_INTERVAL,
 		.procname	= "ipfrag_secret_interval",
-		.data		= &ip4_frags_ctl.secret_interval,
+		.data		= &ip4_frags.secret_interval,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -720,7 +716,6 @@ static int ipv4_frags_init_net(struct net *net)
 void __init ipfrag_init(void)
 {
 	ipv4_frags_init_net(&init_net);
-	ip4_frags.ctl = &ip4_frags_ctl;
 	ip4_frags.hashfn = ip4_hashfn;
 	ip4_frags.constructor = ip4_frag_init;
 	ip4_frags.destructor = ip4_frag_free;
@@ -728,6 +723,7 @@ void __init ipfrag_init(void)
 	ip4_frags.qsize = sizeof(struct ipq);
 	ip4_frags.match = ip4_frag_match;
 	ip4_frags.frag_expire = ip_expire;
+	ip4_frags.secret_interval = 10 * 60 * HZ;
 	inet_frags_init(&ip4_frags);
 }
 

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -70,10 +70,6 @@ struct nf_ct_frag6_queue
 	__u16			nhoffset;
 };
 
-static struct inet_frags_ctl nf_frags_ctl __read_mostly = {
-	.secret_interval = 10 * 60 * HZ,
-};
-
 static struct inet_frags nf_frags;
 static struct netns_frags nf_init_frags;
 
@@ -701,7 +697,6 @@ int nf_ct_frag6_kfree_frags(struct sk_buff *skb)
 
 int nf_ct_frag6_init(void)
 {
-	nf_frags.ctl = &nf_frags_ctl;
 	nf_frags.hashfn = nf_hashfn;
 	nf_frags.constructor = ip6_frag_init;
 	nf_frags.destructor = NULL;
@@ -709,6 +704,7 @@ int nf_ct_frag6_init(void)
 	nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);
 	nf_frags.match = ip6_frag_match;
 	nf_frags.frag_expire = nf_ct_frag6_expire;
+	nf_frags.secret_interval = 10 * 60 * HZ;
 	nf_init_frags.timeout = IPV6_FRAG_TIMEOUT;
 	nf_init_frags.high_thresh = 256 * 1024;
 	nf_init_frags.low_thresh = 192 * 1024;

net/ipv6/reassembly.c

@@ -658,7 +658,7 @@ static struct ctl_table ip6_frags_ctl_table[] = {
 	{
 		.ctl_name	= NET_IPV6_IP6FRAG_SECRET_INTERVAL,
 		.procname	= "ip6frag_secret_interval",
-		.data		= &init_net.ipv6.sysctl.frags.secret_interval,
+		.data		= &ip6_frags.secret_interval,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -719,12 +719,9 @@ static inline void ip6_frags_sysctl_unregister(struct net *net)
 
 static int ipv6_frags_init_net(struct net *net)
 {
-	ip6_frags.ctl = &net->ipv6.sysctl.frags;
-
 	net->ipv6.frags.high_thresh = 256 * 1024;
 	net->ipv6.frags.low_thresh = 192 * 1024;
 	net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
-	net->ipv6.sysctl.frags.secret_interval = 10 * 60 * HZ;
 
 	inet_frags_init_net(&net->ipv6.frags);
 
@@ -748,6 +745,7 @@ int __init ipv6_frag_init(void)
 	ip6_frags.qsize = sizeof(struct frag_queue);
 	ip6_frags.match = ip6_frag_match;
 	ip6_frags.frag_expire = ip6_frag_expire;
+	ip6_frags.secret_interval = 10 * 60 * HZ;
 	inet_frags_init(&ip6_frags);
 out:
 	return ret;