[UDP]: Allow users to configure UDP-Lite.

Let's give users an option for disabling UDP-Lite (~4K).

old:
|    text	   data	    bss	    dec	    hex	filename
|  286498	  12432	   6072	 305002	  4a76a	net/ipv4/built-in.o
|  193830	   8192	   3204	 205226	  321aa	net/ipv6/ipv6.o

new (without UDP-Lite):
|    text	   data	    bss	    dec	    hex	filename
|  284086	  12136	   5432	 301654	  49a56	net/ipv4/built-in.o
|  191835	   7832	   3076	 202743	  317f7	net/ipv6/ipv6.o

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 9869f87243cf..243c42a6b80d 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -691,12 +691,16 @@ static int __init init_ipv6_mibs(void)
                 goto err_icmpmsg_mib;
         if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
                 goto err_udp_mib;
+#ifdef CONFIG_IP_UDPLITE
         if (snmp_mib_init((void **)udplite_stats_in6,
                           sizeof (struct udp_mib)) < 0)
                 goto err_udplite_mib;
+#endif
         return 0;
 
+#ifdef CONFIG_IP_UDPLITE
 err_udplite_mib:
+#endif
         snmp_mib_free((void **)udp_stats_in6);
 err_udp_mib:
         snmp_mib_free((void **)icmpv6msg_statistics);
@@ -715,7 +719,9 @@ static void cleanup_ipv6_mibs(void)
         snmp_mib_free((void **)icmpv6_statistics);
         snmp_mib_free((void **)icmpv6msg_statistics);
         snmp_mib_free((void **)udp_stats_in6);
+#ifdef CONFIG_IP_UDPLITE
         snmp_mib_free((void **)udplite_stats_in6);
+#endif
 }
 
 static int inet6_net_init(struct net *net)
@@ -760,9 +766,11 @@ static int __init inet6_init(void)
         if (err)
                 goto out_unregister_tcp_proto;
 
+#ifdef CONFIG_IP_UDPLITE
         err = proto_register(&udplitev6_prot, 1);
         if (err)
                 goto out_unregister_udp_proto;
+#endif
 
         err = proto_register(&rawv6_prot, 1);
         if (err)
@@ -933,8 +941,10 @@ out_sock_register_fail:
 out_unregister_raw_proto:
         proto_unregister(&rawv6_prot);
 out_unregister_udplite_proto:
+#ifdef CONFIG_IP_UDPLITE
         proto_unregister(&udplitev6_prot);
 out_unregister_udp_proto:
+#endif
         proto_unregister(&udpv6_prot);
 out_unregister_tcp_proto:
         proto_unregister(&tcpv6_prot);
@@ -950,7 +960,9 @@ static void __exit inet6_exit(void)
         rtnl_unregister_all(PF_INET6);
 
         udpv6_exit();
+#ifdef CONFIG_IP_UDPLITE
         udplitev6_exit();
+#endif
         tcpv6_exit();
 
         /* Cleanup code parts. */
@@ -982,7 +994,9 @@ static void __exit inet6_exit(void)
         unregister_pernet_subsys(&inet6_net_ops);
         cleanup_ipv6_mibs();
         proto_unregister(&rawv6_prot);
+#ifdef CONFIG_IP_UDPLITE
         proto_unregister(&udplitev6_prot);
+#endif
         proto_unregister(&udpv6_prot);
         proto_unregister(&tcpv6_prot);
 }