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Commit 7dc04d71 authored by Michio Honda's avatar Michio Honda Committed by David S. Miller
Browse files

sctp: Add socket option operation for Auto-ASCONF. 



This patch allows the application to operate Auto-ASCONF on/off
behavior via setsockopt() and getsockopt().

Signed-off-by: default avatarMichio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dd51be0f

include/net/sctp/user.h

+1 −0
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ typedef __s32 sctp_assoc_t; 
#define SCTP_LOCAL_AUTH_CHUNKS	27	/* Read only */

#define SCTP_GET_ASSOC_NUMBER	28	/* Read only */

#define SCTP_GET_ASSOC_ID_LIST	29	/* Read only */

#define SCTP_AUTO_ASCONF       30



/* Internal Socket Options. Some of the sctp library functions are

 * implemented using these socket options.

net/sctp/socket.c

+68 −0
Original line number Diff line number Diff line
@@ -3356,6 +3356,46 @@ static int sctp_setsockopt_del_key(struct sock *sk, 


}



/*

 * 8.1.23 SCTP_AUTO_ASCONF

 *

 * This option will enable or disable the use of the automatic generation of

 * ASCONF chunks to add and delete addresses to an existing association.  Note

 * that this option has two caveats namely: a) it only affects sockets that

 * are bound to all addresses available to the SCTP stack, and b) the system

 * administrator may have an overriding control that turns the ASCONF feature

 * off no matter what setting the socket option may have.

 * This option expects an integer boolean flag, where a non-zero value turns on

 * the option, and a zero value turns off the option.

 * Note. In this implementation, socket operation overrides default parameter

 * being set by sysctl as well as FreeBSD implementation

 */

static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,

					unsigned int optlen)

{

	int val;

	struct sctp_sock *sp = sctp_sk(sk);



	if (optlen < sizeof(int))

		return -EINVAL;

	if (get_user(val, (int __user *)optval))

		return -EFAULT;

	if (!sctp_is_ep_boundall(sk) && val)

		return -EINVAL;

	if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))

		return 0;



	if (val == 0 && sp->do_auto_asconf) {

		list_del(&sp->auto_asconf_list);

		sp->do_auto_asconf = 0;

	} else if (val && !sp->do_auto_asconf) {

		list_add_tail(&sp->auto_asconf_list,

		    &sctp_auto_asconf_splist);

		sp->do_auto_asconf = 1;

	}

	return 0;

}





/* API 6.2 setsockopt(), getsockopt()

 *
@@ -3503,6 +3543,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, 
	case SCTP_AUTH_DELETE_KEY:

		retval = sctp_setsockopt_del_key(sk, optval, optlen);

		break;

	case SCTP_AUTO_ASCONF:

		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;
@@ -5308,6 +5351,28 @@ static int sctp_getsockopt_assoc_number(struct sock *sk, int len, 
	return 0;

}



/*

 * 8.1.23 SCTP_AUTO_ASCONF

 * See the corresponding setsockopt entry as description

 */

static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,

				   char __user *optval, int __user *optlen)

{

	int val = 0;



	if (len < sizeof(int))

		return -EINVAL;



	len = sizeof(int);

	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))

		val = 1;

	if (put_user(len, optlen))

		return -EFAULT;

	if (copy_to_user(optval, &val, len))

		return -EFAULT;

	return 0;

}



/*

 * 8.2.6. Get the Current Identifiers of Associations

 *        (SCTP_GET_ASSOC_ID_LIST)
@@ -5492,6 +5557,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname, 
	case SCTP_GET_ASSOC_ID_LIST:

		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);

		break;

	case SCTP_AUTO_ASCONF:

		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;