[NETNS][IPV6]: Make ip6_frags per namespace.

The ip6_frags is moved to the network namespace structure.  Because
there can be multiple instances of the network namespaces, and the
ip6_frags is no longer a global static variable, a helper function has
been added to facilitate the initialization of the variables.

Until the ipv6 protocol is not per namespace, the variables are
accessed relatively from the initial network namespace.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 23 insertions, 13 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 70662bf8ab98..c4a1882fa80f 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -72,6 +72,8 @@ MODULE_LICENSE("GPL");
 static struct list_head inetsw6[SOCK_MAX];
 static DEFINE_SPINLOCK(inetsw6_lock);
 
+void ipv6_frag_sysctl_init(struct net *net);
+
 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 {
         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
@@ -720,6 +722,12 @@ static void cleanup_ipv6_mibs(void)
 static int inet6_net_init(struct net *net)
 {
         net->ipv6.sysctl.bindv6only = 0;
+        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.sysctl.frags.secret_interval = 10 * 60 * HZ;
+        ipv6_frag_sysctl_init(net);
+
         return 0;
 }
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index bf4173daecbb..5cd0bc693a5f 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -82,13 +82,6 @@ struct frag_queue
         __u16                   nhoffset;
 };
 
-struct inet_frags_ctl ip6_frags_ctl __read_mostly = {
-        .high_thresh     = 256 * 1024,
-        .low_thresh      = 192 * 1024,
-        .timeout         = IPV6_FRAG_TIMEOUT,
-        .secret_interval = 10 * 60 * HZ,
-};
-
 static struct inet_frags ip6_frags;
 
 int ip6_frag_nqueues(void)
@@ -605,7 +598,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
                 return 1;
         }
 
-        if (atomic_read(&ip6_frags.mem) > ip6_frags_ctl.high_thresh)
+        if (atomic_read(&ip6_frags.mem) > init_net.ipv6.sysctl.frags.high_thresh)
                 ip6_evictor(ip6_dst_idev(skb->dst));
 
         if ((fq = fq_find(fhdr->identification, &hdr->saddr, &hdr->daddr,
@@ -632,6 +625,11 @@ static struct inet6_protocol frag_protocol =
         .flags          =       INET6_PROTO_NOPOLICY,
 };
 
+void ipv6_frag_sysctl_init(struct net *net)
+{
+        ip6_frags.ctl = &net->ipv6.sysctl.frags;
+}
+
 int __init ipv6_frag_init(void)
 {
         int ret;
@@ -639,7 +637,7 @@ int __init ipv6_frag_init(void)
         ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
         if (ret)
                 goto out;
-        ip6_frags.ctl = &ip6_frags_ctl;
+
         ip6_frags.hashfn = ip6_hashfn;
         ip6_frags.constructor = ip6_frag_init;
         ip6_frags.destructor = NULL;
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 13be97a928cb..ae3cfd1b8e0e 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -43,7 +43,7 @@ static ctl_table ipv6_table_template[] = {
         {
                 .ctl_name       = NET_IPV6_IP6FRAG_HIGH_THRESH,
                 .procname       = "ip6frag_high_thresh",
-                .data           = &ip6_frags_ctl.high_thresh,
+                .data           = &init_net.ipv6.sysctl.frags.high_thresh,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec
@@ -51,7 +51,7 @@ static ctl_table ipv6_table_template[] = {
         {
                 .ctl_name       = NET_IPV6_IP6FRAG_LOW_THRESH,
                 .procname       = "ip6frag_low_thresh",
-                .data           = &ip6_frags_ctl.low_thresh,
+                .data           = &init_net.ipv6.sysctl.frags.low_thresh,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec
@@ -59,7 +59,7 @@ static ctl_table ipv6_table_template[] = {
         {
                 .ctl_name       = NET_IPV6_IP6FRAG_TIME,
                 .procname       = "ip6frag_time",
-                .data           = &ip6_frags_ctl.timeout,
+                .data           = &init_net.ipv6.sysctl.frags.timeout,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec_jiffies,
@@ -68,7 +68,7 @@ static ctl_table ipv6_table_template[] = {
         {
                 .ctl_name       = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
                 .procname       = "ip6frag_secret_interval",
-                .data           = &ip6_frags_ctl.secret_interval,
+                .data           = &init_net.ipv6.sysctl.frags.secret_interval,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec_jiffies,
@@ -117,6 +117,10 @@ static int ipv6_sysctl_net_init(struct net *net)
         ipv6_table[1].child = ipv6_icmp_table;
 
         ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
+        ipv6_table[3].data = &net->ipv6.sysctl.frags.high_thresh;
+        ipv6_table[4].data = &net->ipv6.sysctl.frags.low_thresh;
+        ipv6_table[5].data = &net->ipv6.sysctl.frags.timeout;
+        ipv6_table[6].data = &net->ipv6.sysctl.frags.secret_interval;
 
         net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
                                                            ipv6_table);