[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: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 8 insertions, 23 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index de4135925490..1917fbeb362b 100644
--- a/include/net/inet_frag.h
+++ b/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,
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 87ab56ab93fc..187c4248df22 100644
--- a/include/net/netns/ipv6.h
+++ b/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;
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 5ab399c15282..fcf5252166fa 100644
--- a/net/ipv4/inet_fragment.c
+++ b/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);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 80c2c19196cd..00646ed451f5 100644
--- a/net/ipv4/ip_fragment.c
+++ b/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);
 }
 
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index c75ac17e3945..6eed991a4a3f 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/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;
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 85f3fa382230..852070087307 100644
--- a/net/ipv6/reassembly.c
+++ b/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;