[NETNS][FRAGS]: Make the net.ipv4.ipfrag_timeout work in namespaces.

Move it to the netns_frags, adjust the usage and
make the appropriate ctl table writable.

Now fragment, that live in different namespaces can
live for different times.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -4,6 +4,9 @@
 struct netns_frags {
 	int			nqueues;
 	atomic_t		mem;
+
+	/* sysctls */
+	int			timeout;
 };
 
 struct inet_frag_queue {
@@ -29,7 +32,6 @@ struct inet_frag_queue {
 struct inet_frags_ctl {
 	int high_thresh;
 	int low_thresh;
-	int timeout;
 	int secret_interval;
 };
 

net/ipv4/inet_fragment.c

@@ -206,7 +206,7 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
 	}
 #endif
 	qp = qp_in;
-	if (!mod_timer(&qp->timer, jiffies + f->ctl->timeout))
+	if (!mod_timer(&qp->timer, jiffies + nf->timeout))
 		atomic_inc(&qp->refcnt);
 
 	atomic_inc(&qp->refcnt);

net/ipv4/ip_fragment.c

@@ -83,13 +83,6 @@ static struct inet_frags_ctl ip4_frags_ctl __read_mostly = {
 	 */
 	.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,
 };
 
@@ -287,7 +280,7 @@ static int ip_frag_reinit(struct ipq *qp)
 {
 	struct sk_buff *fp;
 
-	if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout)) {
+	if (!mod_timer(&qp->q.timer, jiffies + qp->q.net->timeout)) {
 		atomic_inc(&qp->q.refcnt);
 		return -ETIMEDOUT;
 	}
@@ -633,7 +626,7 @@ static struct ctl_table ip4_frags_ctl_table[] = {
 	{
 		.ctl_name	= NET_IPV4_IPFRAG_TIME,
 		.procname	= "ipfrag_time",
-		.data		= &ip4_frags_ctl.timeout,
+		.data		= &init_net.ipv4.frags.timeout,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -672,7 +665,7 @@ static int ip4_frags_ctl_register(struct net *net)
 
 		table[0].mode &= ~0222;
 		table[1].mode &= ~0222;
-		table[2].mode &= ~0222;
+		table[2].data = &net->ipv4.frags.timeout;
 		table[3].mode &= ~0222;
 		table[4].mode &= ~0222;
 	}
@@ -712,6 +705,13 @@ static inline void ip4_frags_ctl_unregister(struct net *net)
 
 static int ipv4_frags_init_net(struct net *net)
 {
+	/*
+	 * Important NOTE! Fragment queue must be destroyed before MSL expires.
+	 * RFC791 is wrong proposing to prolongate timer each fragment arrival
+	 * by TTL.
+	 */
+	net->ipv4.frags.timeout = IP_FRAG_TIME;
+
 	inet_frags_init_net(&net->ipv4.frags);
 
 	return ip4_frags_ctl_register(net);

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -73,7 +73,6 @@ struct nf_ct_frag6_queue
 static struct inet_frags_ctl nf_frags_ctl __read_mostly = {
 	.high_thresh	 = 256 * 1024,
 	.low_thresh	 = 192 * 1024,
-	.timeout	 = IPV6_FRAG_TIMEOUT,
 	.secret_interval = 10 * 60 * HZ,
 };
 
@@ -84,7 +83,7 @@ static struct netns_frags nf_init_frags;
 struct ctl_table nf_ct_ipv6_sysctl_table[] = {
 	{
 		.procname	= "nf_conntrack_frag6_timeout",
-		.data		= &nf_frags_ctl.timeout,
+		.data		= &nf_init_frags.timeout,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -712,6 +711,7 @@ 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_init_frags.timeout = IPV6_FRAG_TIMEOUT;
 	inet_frags_init_net(&nf_init_frags);
 	inet_frags_init(&nf_frags);
 

net/ipv6/reassembly.c

@@ -650,7 +650,7 @@ static struct ctl_table ip6_frags_ctl_table[] = {
 	{
 		.ctl_name	= NET_IPV6_IP6FRAG_TIME,
 		.procname	= "ip6frag_time",
-		.data		= &init_net.ipv6.sysctl.frags.timeout,
+		.data		= &init_net.ipv6.frags.timeout,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec_jiffies,
@@ -681,7 +681,7 @@ static int ip6_frags_sysctl_register(struct net *net)
 
 		table[0].mode &= ~0222;
 		table[1].mode &= ~0222;
-		table[2].mode &= ~0222;
+		table[2].data = &net->ipv6.frags.timeout;
 		table[3].mode &= ~0222;
 	}
 
@@ -724,7 +724,7 @@ static int ipv6_frags_init_net(struct net *net)
 
 	net->ipv6.sysctl.frags.high_thresh = 256 * 1024;
 	net->ipv6.sysctl.frags.low_thresh = 192 * 1024;
-	net->ipv6.sysctl.frags.timeout = IPV6_FRAG_TIMEOUT;
+	net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
 	net->ipv6.sysctl.frags.secret_interval = 10 * 60 * HZ;
 
 	inet_frags_init_net(&net->ipv6.frags);