Commit d49d91d7 authored by Vlad Yasevich's avatar Vlad Yasevich Committed by David S. Miller
Browse files

[SCTP]: Implement SCTP_PARTIAL_DELIVERY_POINT option. 



This option induces partial delivery to run as soon
as the specified amount of data has been accumulated on
the association.  However, we give preference to fully
reassembled messages over PD messages.  In any case,
window and buffer is freed up.

Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@.hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b6e1331f

include/net/sctp/structs.h

+1 −0
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ struct sctp_sock { 
	__u8 v4mapped;

	__u8 frag_interleave;

	__u32 adaptation_ind;

	__u32 pd_point;



	atomic_t pd_mode;

	/* Receive to here while partial delivery is in effect. */

include/net/sctp/user.h

+2 −0
Original line number Diff line number Diff line
@@ -99,6 +99,8 @@ enum sctp_optname { 
#define SCTP_CONTEXT SCTP_CONTEXT

	SCTP_FRAGMENT_INTERLEAVE,

#define SCTP_FRAGMENT_INTERLEAVE SCTP_FRAGMENT_INTERLEAVE

	SCTP_PARTIAL_DELIVERY_POINT,	/* Set/Get partial delivery point */

#define SCTP_PARTIAL_DELIVERY_POINT SCTP_PARTIAL_DELIVERY_POINT



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

	 * implemented using these socket options.

net/sctp/socket.c

+57 −0
Original line number Diff line number Diff line
@@ -2832,6 +2832,32 @@ static int sctp_setsockopt_fragment_interleave(struct sock *sk, 
	return 0;

}



/*

 * 7.1.25.  Set or Get the sctp partial delivery point

 *       (SCTP_PARTIAL_DELIVERY_POINT)

 * This option will set or get the SCTP partial delivery point.  This

 * point is the size of a message where the partial delivery API will be

 * invoked to help free up rwnd space for the peer.  Setting this to a

 * lower value will cause partial delivery's to happen more often.  The

 * calls argument is an integer that sets or gets the partial delivery

 * point.

 */

static int sctp_setsockopt_partial_delivery_point(struct sock *sk,

						  char __user *optval,

						  int optlen)

{

	u32 val;



	if (optlen != sizeof(u32))

		return -EINVAL;

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

		return -EFAULT;



	sctp_sk(sk)->pd_point = val;



	return 0; /* is this the right error code? */

}



/* API 6.2 setsockopt(), getsockopt()

 *

 * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -2911,6 +2937,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, 
	case SCTP_DELAYED_ACK_TIME:

		retval = sctp_setsockopt_delayed_ack_time(sk, optval, optlen);

		break;

	case SCTP_PARTIAL_DELIVERY_POINT:

		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);

		break;



	case SCTP_INITMSG:

		retval = sctp_setsockopt_initmsg(sk, optval, optlen);
@@ -4602,6 +4631,30 @@ static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len, 
	return 0;

}



/*

 * 7.1.25.  Set or Get the sctp partial delivery point

 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())

 */

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

						  char __user *optval,

						  int __user *optlen)

{

        u32 val;



	if (len < sizeof(u32))

		return -EINVAL;



	len = sizeof(u32);



	val = sctp_sk(sk)->pd_point;

	if (put_user(len, optlen))

		return -EFAULT;

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

		return -EFAULT;



	return -ENOTSUPP;

}



SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,

				char __user *optval, int __user *optlen)

{
@@ -4718,6 +4771,10 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname, 
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,

							     optlen);

		break;

	case SCTP_PARTIAL_DELIVERY_POINT:

		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,

								optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;

net/sctp/ulpqueue.c

+60 −4
Original line number Diff line number Diff line
@@ -177,6 +177,15 @@ int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc) 
	return 0;

}



/* Set the pd_mode on the socket and ulpq */

static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)

{

	struct sctp_sock *sp = sctp_sk(ulpq->asoc->base.sk);



	atomic_inc(&sp->pd_mode);

	ulpq->pd_mode = 1;

}



/* Clear the pd_mode and restart any pending messages waiting for delivery. */

static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)

{
@@ -401,6 +410,11 @@ static inline struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_u 
	struct sk_buff *first_frag = NULL;

	__u32 ctsn, next_tsn;

	struct sctp_ulpevent *retval = NULL;

	struct sk_buff *pd_first = NULL;

	struct sk_buff *pd_last = NULL;

	size_t pd_len = 0;

	struct sctp_association *asoc;

	u32 pd_point;



	/* Initialized to 0 just to avoid compiler warning message.  Will

	 * never be used with this value. It is referenced only after it
@@ -416,6 +430,10 @@ static inline struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_u 
	 * we expect to find the remaining middle fragments and the last

	 * fragment in order. If not, first_frag is reset to NULL and we

	 * start the next pass when we find another first fragment.

	 *

	 * There is a potential to do partial delivery if user sets

	 * SCTP_PARTIAL_DELIVERY_POINT option. Lets count some things here

	 * to see if can do PD.

	 */

	skb_queue_walk(&ulpq->reasm, pos) {

		cevent = sctp_skb2event(pos);
@@ -423,14 +441,32 @@ static inline struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_u 


		switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {

		case SCTP_DATA_FIRST_FRAG:

			/* If this "FIRST_FRAG" is the first

			 * element in the queue, then count it towards

			 * possible PD.

			 */

			if (pos == ulpq->reasm.next) {

			    pd_first = pos;

			    pd_last = pos;

			    pd_len = pos->len;

			} else {

			    pd_first = NULL;

			    pd_last = NULL;

			    pd_len = 0;

			}



			first_frag = pos;

			next_tsn = ctsn + 1;

			break;



		case SCTP_DATA_MIDDLE_FRAG:

			if ((first_frag) && (ctsn == next_tsn))

			if ((first_frag) && (ctsn == next_tsn)) {

				next_tsn++;

			else

				if (pd_first) {

				    pd_last = pos;

				    pd_len += pos->len;

				}

			} else

				first_frag = NULL;

			break;
@@ -441,7 +477,28 @@ static inline struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_u 
				first_frag = NULL;

			break;

		};

	}



	asoc = ulpq->asoc;

	if (pd_first) {

		/* Make sure we can enter partial deliver.

		 * We can trigger partial delivery only if framgent

		 * interleave is set, or the socket is not already

		 * in  partial delivery.

		 */

		if (!sctp_sk(asoc->base.sk)->frag_interleave &&

		    atomic_read(&sctp_sk(asoc->base.sk)->pd_mode))

			goto done;



		cevent = sctp_skb2event(pd_first);

		pd_point = sctp_sk(asoc->base.sk)->pd_point;

		if (pd_point && pd_point <= pd_len) {

			retval = sctp_make_reassembled_event(&ulpq->reasm,

							     pd_first,

							     pd_last);

			if (retval)

				sctp_ulpq_set_pd(ulpq);

		}

	}

done:

	return retval;
@@ -882,8 +939,7 @@ void sctp_ulpq_partial_delivery(struct sctp_ulpq *ulpq, 
		/* Send event to the ULP.   */

		if (event) {

			sctp_ulpq_tail_event(ulpq, event);

			atomic_inc(&sp->pd_mode);

			ulpq->pd_mode = 1;

			sctp_ulpq_set_pd(ulpq);

			return;

		}

	}

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