sctp: Add sysctl support for Auto-ASCONF.

This patch allows the system administrator to change default
Auto-ASCONF on/off behavior via an sysctl value.
Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sysctl.c

@@ -182,6 +182,13 @@ static ctl_table sctp_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
+	{
+		.procname	= "default_auto_asconf",
+		.data		= &sctp_default_auto_asconf,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
 	{
 		.procname	= "prsctp_enable",
 		.data		= &sctp_prsctp_enable,