Commit 6b3fd5f3 authored by Geir Ola Vaagland's avatar Geir Ola Vaagland Committed by David S. Miller
Browse files

net: sctp: implement rfc6458, 8.1.31. SCTP_DEFAULT_SNDINFO support 



This patch implements section 8.1.31. of RFC6458, which adds support
for setting/retrieving SCTP_DEFAULT_SNDINFO:

  Applications that wish to use the sendto() system call may wish
  to specify a default set of parameters that would normally be
  supplied through the inclusion of ancillary data. This socket
  option allows such an application to set the default sctp_sndinfo
  structure. The application that wishes to use this socket option
  simply passes the sctp_sndinfo structure (defined in Section 5.3.4)
  to this call. The input parameters accepted by this call include
  snd_sid, snd_flags, snd_ppid, and snd_context. The snd_flags
  parameter is composed of a bitwise OR of SCTP_UNORDERED, SCTP_EOF,
  and SCTP_SENDALL. The snd_assoc_id field specifies the association
  to which to apply the parameters. For a one-to-many style socket,
  any of the predefined constants are also allowed in this field.
  The field is ignored for one-to-one style sockets.

Joint work with Daniel Borkmann.

Signed-off-by: default avatarGeir Ola Vaagland <geirola@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2347c80f

include/uapi/linux/sctp.h

+1 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ typedef __s32 sctp_assoc_t; 
#define SCTP_PEER_ADDR_THLDS	31

#define SCTP_RECVRCVINFO	32

#define SCTP_RECVNXTINFO	33

#define SCTP_DEFAULT_SNDINFO	34



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

 * implemented using these socket options.

net/sctp/socket.c

+98 −9
Original line number Diff line number Diff line
@@ -2770,19 +2770,22 @@ static int sctp_setsockopt_default_send_param(struct sock *sk, 
					      char __user *optval,

					      unsigned int optlen)

{

	struct sctp_sndrcvinfo info;

	struct sctp_association *asoc;

	struct sctp_sock *sp = sctp_sk(sk);

	struct sctp_association *asoc;

	struct sctp_sndrcvinfo info;



	if (optlen != sizeof(struct sctp_sndrcvinfo))

	if (optlen != sizeof(info))

		return -EINVAL;

	if (copy_from_user(&info, optval, optlen))

		return -EFAULT;

	if (info.sinfo_flags &

	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |

	      SCTP_ABORT | SCTP_EOF))

		return -EINVAL;



	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);

	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))

		return -EINVAL;



	if (asoc) {

		asoc->default_stream = info.sinfo_stream;

		asoc->default_flags = info.sinfo_flags;
@@ -2800,6 +2803,44 @@ static int sctp_setsockopt_default_send_param(struct sock *sk, 
	return 0;

}



/* RFC6458, Section 8.1.31. Set/get Default Send Parameters

 * (SCTP_DEFAULT_SNDINFO)

 */

static int sctp_setsockopt_default_sndinfo(struct sock *sk,

					   char __user *optval,

					   unsigned int optlen)

{

	struct sctp_sock *sp = sctp_sk(sk);

	struct sctp_association *asoc;

	struct sctp_sndinfo info;



	if (optlen != sizeof(info))

		return -EINVAL;

	if (copy_from_user(&info, optval, optlen))

		return -EFAULT;

	if (info.snd_flags &

	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |

	      SCTP_ABORT | SCTP_EOF))

		return -EINVAL;



	asoc = sctp_id2assoc(sk, info.snd_assoc_id);

	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))

		return -EINVAL;

	if (asoc) {

		asoc->default_stream = info.snd_sid;

		asoc->default_flags = info.snd_flags;

		asoc->default_ppid = info.snd_ppid;

		asoc->default_context = info.snd_context;

	} else {

		sp->default_stream = info.snd_sid;

		sp->default_flags = info.snd_flags;

		sp->default_ppid = info.snd_ppid;

		sp->default_context = info.snd_context;

	}



	return 0;

}



/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)

 *

 * Requests that the local SCTP stack use the enclosed peer address as
@@ -3725,6 +3766,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, 
		retval = sctp_setsockopt_default_send_param(sk, optval,

							    optlen);

		break;

	case SCTP_DEFAULT_SNDINFO:

		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);

		break;

	case SCTP_PRIMARY_ADDR:

		retval = sctp_setsockopt_primary_addr(sk, optval, optlen);

		break;
@@ -5027,14 +5071,14 @@ static int sctp_getsockopt_default_send_param(struct sock *sk, 
					int len, char __user *optval,

					int __user *optlen)

{

	struct sctp_sndrcvinfo info;

	struct sctp_association *asoc;

	struct sctp_sock *sp = sctp_sk(sk);

	struct sctp_association *asoc;

	struct sctp_sndrcvinfo info;



	if (len < sizeof(struct sctp_sndrcvinfo))

	if (len < sizeof(info))

		return -EINVAL;



	len = sizeof(struct sctp_sndrcvinfo);

	len = sizeof(info);



	if (copy_from_user(&info, optval, len))

		return -EFAULT;
@@ -5042,7 +5086,6 @@ static int sctp_getsockopt_default_send_param(struct sock *sk, 
	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);

	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))

		return -EINVAL;



	if (asoc) {

		info.sinfo_stream = asoc->default_stream;

		info.sinfo_flags = asoc->default_flags;
@@ -5065,6 +5108,48 @@ static int sctp_getsockopt_default_send_param(struct sock *sk, 
	return 0;

}



/* RFC6458, Section 8.1.31. Set/get Default Send Parameters

 * (SCTP_DEFAULT_SNDINFO)

 */

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

					   char __user *optval,

					   int __user *optlen)

{

	struct sctp_sock *sp = sctp_sk(sk);

	struct sctp_association *asoc;

	struct sctp_sndinfo info;



	if (len < sizeof(info))

		return -EINVAL;



	len = sizeof(info);



	if (copy_from_user(&info, optval, len))

		return -EFAULT;



	asoc = sctp_id2assoc(sk, info.snd_assoc_id);

	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))

		return -EINVAL;

	if (asoc) {

		info.snd_sid = asoc->default_stream;

		info.snd_flags = asoc->default_flags;

		info.snd_ppid = asoc->default_ppid;

		info.snd_context = asoc->default_context;

	} else {

		info.snd_sid = sp->default_stream;

		info.snd_flags = sp->default_flags;

		info.snd_ppid = sp->default_ppid;

		info.snd_context = sp->default_context;

	}



	if (put_user(len, optlen))

		return -EFAULT;

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

		return -EFAULT;



	return 0;

}



/*

 *

 * 7.1.5 SCTP_NODELAY
@@ -5924,6 +6009,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname, 
		retval = sctp_getsockopt_default_send_param(sk, len,

							    optval, optlen);

		break;

	case SCTP_DEFAULT_SNDINFO:

		retval = sctp_getsockopt_default_sndinfo(sk, len,

							 optval, optlen);

		break;

	case SCTP_PRIMARY_ADDR:

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

		break;

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