[SCTP]: Implement SCTP_MAX_BURST socket option.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 61 insertions, 0 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index dda2f67..f904f2b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2892,6 +2892,36 @@ static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
 	return 0; /* is this the right error code? */
 }
 
+/*
+ * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
+ *
+ * This option will allow a user to change the maximum burst of packets
+ * that can be emitted by this association.  Note that the default value
+ * is 4, and some implementations may restrict this setting so that it
+ * can only be lowered.
+ *
+ * NOTE: This text doesn't seem right.  Do this on a socket basis with
+ * future associations inheriting the socket value.
+ */
+static int sctp_setsockopt_maxburst(struct sock *sk,
+				    char __user *optval,
+				    int optlen)
+{
+	int val;
+
+	if (optlen != sizeof(int))
+		return -EINVAL;
+	if (get_user(val, (int __user *)optval))
+		return -EFAULT;
+
+	if (val < 0)
+		return -EINVAL;
+
+	sctp_sk(sk)->max_burst = val;
+
+	return 0;
+}
+
 /* API 6.2 setsockopt(), getsockopt()
  *
  * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -3012,6 +3042,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
 	case SCTP_FRAGMENT_INTERLEAVE:
 		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
 		break;
+	case SCTP_MAX_BURST:
+		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
+		break;
 	default:
 		retval = -ENOPROTOOPT;
 		break;
@@ -3171,6 +3204,7 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
 	sp->default_timetolive = 0;
 
 	sp->default_rcv_context = 0;
+	sp->max_burst = sctp_max_burst;
 
 	/* Initialize default setup parameters. These parameters
 	 * can be modified with the SCTP_INITMSG socket option or
@@ -4689,6 +4723,30 @@ static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
 	return -ENOTSUPP;
 }
 
+/*
+ * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
+ * (chapter and verse is quoted at sctp_setsockopt_maxburst())
+ */
+static int sctp_getsockopt_maxburst(struct sock *sk, int len,
+				    char __user *optval,
+				    int __user *optlen)
+{
+        int val;
+
+	if (len < sizeof(int))
+		return -EINVAL;
+
+	len = sizeof(int);
+
+	val = sctp_sk(sk)->max_burst;
+	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)
 {
@@ -4809,6 +4867,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
 		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
 								optlen);
 		break;
+	case SCTP_MAX_BURST:
+		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
+		break;
 	default:
 		retval = -ENOPROTOOPT;
 		break;