[NETNS]: Make icmpv6_sk per namespace.

All preparations are done. Now just add a hook to perform an
initialization on namespace startup and replace icmpv6_sk macro with
proper inline call.  Actual namespace the packet belongs too will be
passed later along with the one for the routing.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 47 insertions, 21 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 3eb594d54172..9f55a965c884 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -80,8 +80,10 @@ EXPORT_SYMBOL(icmpv6msg_statistics);
  *
  *      On SMP we have one ICMP socket per-cpu.
  */
-static struct sock **__icmpv6_sk = NULL;
-#define icmpv6_sk       (__icmpv6_sk[smp_processor_id()])
+static inline struct sock *icmpv6_sk(struct net *net)
+{
+        return net->ipv6.icmp_sk[smp_processor_id()];
+}
 
 static int icmpv6_rcv(struct sk_buff *skb);
 
@@ -389,7 +391,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
         fl.fl_icmp_code = code;
         security_skb_classify_flow(skb, &fl);
 
-        sk = icmpv6_sk;
+        sk = icmpv6_sk(&init_net);
         np = inet6_sk(sk);
 
         if (icmpv6_xmit_lock(sk))
@@ -535,7 +537,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
         fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
         security_skb_classify_flow(skb, &fl);
 
-        sk = icmpv6_sk;
+        sk = icmpv6_sk(&init_net);
         np = inet6_sk(sk);
 
         if (icmpv6_xmit_lock(sk))
@@ -780,13 +782,14 @@ drop_no_count:
  */
 static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
 
-int __init icmpv6_init(void)
+static int __net_init icmpv6_sk_init(struct net *net)
 {
         struct sock *sk;
         int err, i, j;
 
-        __icmpv6_sk = kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
-        if (__icmpv6_sk == NULL)
+        net->ipv6.icmp_sk =
+                kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
+        if (net->ipv6.icmp_sk == NULL)
                 return -ENOMEM;
 
         for_each_possible_cpu(i) {
@@ -801,8 +804,8 @@ int __init icmpv6_init(void)
                         goto fail;
                 }
 
-                __icmpv6_sk[i] = sk = sock->sk;
-                sk_change_net(sk, &init_net);
+                net->ipv6.icmp_sk[i] = sk = sock->sk;
+                sk_change_net(sk, net);
 
                 sk->sk_allocation = GFP_ATOMIC;
                 /*
@@ -822,33 +825,56 @@ int __init icmpv6_init(void)
 
                 sk->sk_prot->unhash(sk);
         }
-
-
-        if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) {
-                printk(KERN_ERR "Failed to register ICMP6 protocol\n");
-                err = -EAGAIN;
-                goto fail;
-        }
-
         return 0;
 
  fail:
         for (j = 0; j < i; j++)
-                sk_release_kernel(__icmpv6_sk[j]);
-
+                sk_release_kernel(net->ipv6.icmp_sk[j]);
+        kfree(net->ipv6.icmp_sk);
         return err;
 }
 
-void icmpv6_cleanup(void)
+static void __net_exit icmpv6_sk_exit(struct net *net)
 {
         int i;
 
         for_each_possible_cpu(i) {
-                sk_release_kernel(__icmpv6_sk[i]);
+                sk_release_kernel(net->ipv6.icmp_sk[i]);
         }
+        kfree(net->ipv6.icmp_sk);
+}
+
+static struct pernet_operations __net_initdata icmpv6_sk_ops = {
+       .init = icmpv6_sk_init,
+       .exit = icmpv6_sk_exit,
+};
+
+int __init icmpv6_init(void)
+{
+        int err;
+
+        err = register_pernet_subsys(&icmpv6_sk_ops);
+        if (err < 0)
+                return err;
+
+        err = -EAGAIN;
+        if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
+                goto fail;
+        return 0;
+
+fail:
+        printk(KERN_ERR "Failed to register ICMP6 protocol\n");
+        unregister_pernet_subsys(&icmpv6_sk_ops);
+        return err;
+}
+
+void __exit icmpv6_cleanup(void)
+{
+        unregister_pernet_subsys(&icmpv6_sk_ops);
         inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
 }
 
+
 static const struct icmp6_err {
         int err;
         int fatal;