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Commit 0ccdf3c7 authored by Marcelo Ricardo Leitner's avatar Marcelo Ricardo Leitner Committed by David S. Miller
Browse files

sctp: add sockopt to get/set stream scheduler parameters 

As defined per RFC Draft ndata Section 4.3.3, named as
SCTP_STREAM_SCHEDULER_VALUE.

See-also: https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-13


Tested-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 13aa8770

include/uapi/linux/sctp.h

+7 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ typedef __s32 sctp_assoc_t; 
#define SCTP_ADD_STREAMS	121

#define SCTP_SOCKOPT_PEELOFF_FLAGS 122

#define SCTP_STREAM_SCHEDULER	123

#define SCTP_STREAM_SCHEDULER_VALUE	124



/* PR-SCTP policies */

#define SCTP_PR_SCTP_NONE	0x0000
@@ -815,6 +816,12 @@ struct sctp_assoc_value { 
    uint32_t                assoc_value;

};



struct sctp_stream_value {

	sctp_assoc_t assoc_id;

	uint16_t stream_id;

	uint16_t stream_value;

};



/*

 * 7.2.2 Peer Address Information

 *

net/sctp/socket.c

+77 −0
Original line number Diff line number Diff line
@@ -3945,6 +3945,34 @@ static int sctp_setsockopt_scheduler(struct sock *sk, 
	return retval;

}



static int sctp_setsockopt_scheduler_value(struct sock *sk,

					   char __user *optval,

					   unsigned int optlen)

{

	struct sctp_association *asoc;

	struct sctp_stream_value params;

	int retval = -EINVAL;



	if (optlen < sizeof(params))

		goto out;



	optlen = sizeof(params);

	if (copy_from_user(&params, optval, optlen)) {

		retval = -EFAULT;

		goto out;

	}



	asoc = sctp_id2assoc(sk, params.assoc_id);

	if (!asoc)

		goto out;



	retval = sctp_sched_set_value(asoc, params.stream_id,

				      params.stream_value, GFP_KERNEL);



out:

	return retval;

}



/* API 6.2 setsockopt(), getsockopt()

 *

 * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -4129,6 +4157,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, 
	case SCTP_STREAM_SCHEDULER:

		retval = sctp_setsockopt_scheduler(sk, optval, optlen);

		break;

	case SCTP_STREAM_SCHEDULER_VALUE:

		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;
@@ -6864,6 +6895,48 @@ static int sctp_getsockopt_scheduler(struct sock *sk, int len, 
	return retval;

}



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

					   char __user *optval,

					   int __user *optlen)

{

	struct sctp_stream_value params;

	struct sctp_association *asoc;

	int retval = -EFAULT;



	if (len < sizeof(params)) {

		retval = -EINVAL;

		goto out;

	}



	len = sizeof(params);

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

		goto out;



	asoc = sctp_id2assoc(sk, params.assoc_id);

	if (!asoc) {

		retval = -EINVAL;

		goto out;

	}



	retval = sctp_sched_get_value(asoc, params.stream_id,

				      &params.stream_value);

	if (retval)

		goto out;



	if (put_user(len, optlen)) {

		retval = -EFAULT;

		goto out;

	}



	if (copy_to_user(optval, &params, len)) {

		retval = -EFAULT;

		goto out;

	}



out:

	return retval;

}



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

			   char __user *optval, int __user *optlen)

{
@@ -7050,6 +7123,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname, 
		retval = sctp_getsockopt_scheduler(sk, len, optval,

						   optlen);

		break;

	case SCTP_STREAM_SCHEDULER_VALUE:

		retval = sctp_getsockopt_scheduler_value(sk, len, optval,

							 optlen);

		break;

	default:

		retval = -ENOPROTOOPT;

		break;