[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>
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 5ddb855..bb37724 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -283,7 +283,7 @@
#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
/* Maximum number of new data packets that can be sent in a burst. */
-#define SCTP_MAX_BURST 4
+#define SCTP_DEFAULT_MAX_BURST 4
#define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 37b4a24..7b4fff9 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -276,6 +276,7 @@
__u32 default_context;
__u32 default_timetolive;
__u32 default_rcv_context;
+ int max_burst;
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval. This value
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 1b3153c..6d2b577 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -101,6 +101,8 @@
#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
+ SCTP_MAX_BURST, /* Set/Get max burst */
+#define SCTP_MAX_BURST SCTP_MAX_BURST
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 85af1cb..37a343e 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -143,7 +143,7 @@
/* Initialize the maximum mumber of new data packets that can be sent
* in a burst.
*/
- asoc->max_burst = sctp_max_burst;
+ asoc->max_burst = sp->max_burst;
/* initialize association timers */
asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 7c28c9b..c361deb 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1042,7 +1042,7 @@
sctp_cookie_preserve_enable = 1;
/* Max.Burst - 4 */
- sctp_max_burst = SCTP_MAX_BURST;
+ sctp_max_burst = SCTP_DEFAULT_MAX_BURST;
/* Association.Max.Retrans - 10 attempts
* Path.Max.Retrans - 5 attempts (per destination address)
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 @@
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 @@
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 @@
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 @@
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 @@
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;