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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: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Marcelo Ricardo Leitner 2017-10-03 19:20:15 -03:00 committed by David S. Miller
parent 13aa8770fe
commit 0ccdf3c7fd
2 changed files with 84 additions and 0 deletions
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7
include/uapi/linux/sctp.h
View File

@ -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
*

77
net/sctp/socket.c
View File

@ -3945,6 +3945,34 @@ out:
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 @@ out:
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;