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>

1 files changed, 77 insertions, 0 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index ae35dbf2810f..88c28421ec15 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -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;