sctp: Make the ctl_sock per network namespace

- Kill sctp_get_ctl_sock, it is useless now.
- Pass struct net where needed so net->sctp.ctl_sock is accessible.

Signed-off-by: "Eric W. Biederman" <[email protected]>
Acked-by: Vlad Yasevich <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

include/net/netns/sctp.h

@@ -1,7 +1,15 @@
 #ifndef __NETNS_SCTP_H__
 #define __NETNS_SCTP_H__
 
+struct sock;
+
 struct netns_sctp {
+	/* This is the global socket data structure used for responding to
+	 * the Out-of-the-blue (OOTB) packets.  A control sock will be created
+	 * for this socket at the initialization time.
+	 */
+	struct sock *ctl_sock;
+
 	/* This is the global local address list.
 	 * We actively maintain this complete list of addresses on
 	 * the system by catching address add/delete events.

include/net/sctp/sctp.h

@@ -114,7 +114,6 @@
 /*
  * sctp/protocol.c
  */
-extern struct sock *sctp_get_ctl_sock(void);
 extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
 				     sctp_scope_t, gfp_t gfp,
 				     int flags);