ipv6: do not allow ipv6 module to be removed

There was some bug report on ipv6 module removal path before.
Also, as Stephen pointed out, after vxlan module gets ipv6 support,
the ipv6 stub it used is not safe against this module removal either.
So, let's just remove inet6_exit() so that ipv6 module will not be
able to be unloaded.

Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 7c96100b021ef0558a739b6da719246548153b11..4966b124dc2eaa2d4da9c7cfa48f369e0f5cbd9d 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -1028,52 +1028,4 @@ out_unregister_tcp_proto:
 }
 module_init(inet6_init);
 
-static void __exit inet6_exit(void)
-{
-       if (disable_ipv6_mod)
-               return;
-
-       /* First of all disallow new sockets creation. */
-       sock_unregister(PF_INET6);
-       /* Disallow any further netlink messages */
-       rtnl_unregister_all(PF_INET6);
-
-       udpv6_exit();
-       udplitev6_exit();
-       tcpv6_exit();
-
-       /* Cleanup code parts. */
-       ipv6_packet_cleanup();
-       ipv6_frag_exit();
-       ipv6_exthdrs_exit();
-       addrconf_cleanup();
-       ip6_flowlabel_cleanup();
-       ndisc_late_cleanup();
-       ip6_route_cleanup();
-#ifdef CONFIG_PROC_FS
-
-       /* Cleanup code parts. */
-       if6_proc_exit();
-       ipv6_misc_proc_exit();
-       udplite6_proc_exit();
-       raw6_proc_exit();
-#endif
-       ipv6_netfilter_fini();
-       ipv6_stub = NULL;
-       igmp6_cleanup();
-       ndisc_cleanup();
-       ip6_mr_cleanup();
-       icmpv6_cleanup();
-       rawv6_exit();
-
-       unregister_pernet_subsys(&inet6_net_ops);
-       proto_unregister(&rawv6_prot);
-       proto_unregister(&udplitev6_prot);
-       proto_unregister(&udpv6_prot);
-       proto_unregister(&tcpv6_prot);
-
-       rcu_barrier(); /* Wait for completion of call_rcu()'s */
-}
-module_exit(inet6_exit);
-
 MODULE_ALIAS_NETPROTO(PF_INET6);