[NETNS][DCCPV6]: Move the dccp_v6_ctl_sk on the struct net.

And replace all its usage with init_net's socket.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/netns/dccp.h

@@ -5,6 +5,7 @@ struct sock;
 
 struct netns_dccp {
 	struct sock *v4_ctl_sk;
+	struct sock *v6_ctl_sk;
 };
 
 #endif

net/dccp/ipv6.c

@@ -33,8 +33,7 @@
 #include "ipv6.h"
 #include "feat.h"
 
-/* Socket used for sending RSTs and ACKs */
-static struct sock *dccp_v6_ctl_sk;
+/* dccp_v6_ctl_sk is used for sending RSTs and ACKs */
 
 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
@@ -296,6 +295,7 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	struct ipv6hdr *rxip6h;
 	struct sk_buff *skb;
 	struct flowi fl;
+	struct sock *ctl_sk = init_net.dccp.v6_ctl_sk;
 
 	if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 		return;
@@ -303,7 +303,7 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	if (!ipv6_unicast_destination(rxskb))
 		return;
 
-	skb = dccp_ctl_make_reset(dccp_v6_ctl_sk, rxskb);
+	skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 	if (skb == NULL)
 		return;
 
@@ -322,9 +322,9 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	security_skb_classify_flow(rxskb, &fl);
 
 	/* sk = NULL, but it is safe for now. RST socket required. */
-	if (!ip6_dst_lookup(dccp_v6_ctl_sk, &skb->dst, &fl)) {
+	if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
 		if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
-			ip6_xmit(dccp_v6_ctl_sk, skb, &fl, NULL, 0);
+			ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 			DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 			DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 			return;
@@ -1198,7 +1198,7 @@ static int __init dccp_v6_init(void)
 
 	inet6_register_protosw(&dccp_v6_protosw);
 
-	err = inet_ctl_sock_create(&dccp_v6_ctl_sk, PF_INET6,
+	err = inet_ctl_sock_create(&init_net.dccp.v6_ctl_sk, PF_INET6,
 				   SOCK_DCCP, IPPROTO_DCCP, &init_net);
 	if (err != 0)
 		goto out_unregister_protosw;
@@ -1210,7 +1210,7 @@ static int __init dccp_v6_init(void)
 	return err;
 
 out_destroy_ctl_sock:
-	inet_ctl_sock_destroy(dccp_v6_ctl_sk);
+	inet_ctl_sock_destroy(init_net.dccp.v6_ctl_sk);
 out_unregister_protosw:
 	inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
 	inet6_unregister_protosw(&dccp_v6_protosw);
@@ -1222,7 +1222,7 @@ static int __init dccp_v6_init(void)
 static void __exit dccp_v6_exit(void)
 {
 	unregister_pernet_subsys(&dccp_v6_ops);
-	inet_ctl_sock_destroy(dccp_v6_ctl_sk);
+	inet_ctl_sock_destroy(init_net.dccp.v6_ctl_sk);
 	inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
 	inet6_unregister_protosw(&dccp_v6_protosw);
 	proto_unregister(&dccp_v6_prot);