[SCTP]: Bring MAX_BURST socket option into ietf API extension compliance

Brings max_burst socket option set/get into line with the latest ietf
socket extensions api draft, while maintaining backwards
compatibility.

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

1 files changed, 60 insertions, 13 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 939892691a26..d994d822900d 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2933,17 +2933,39 @@ static int sctp_setsockopt_maxburst(struct sock *sk,
                                     char __user *optval,
                                     int optlen)
 {
+        struct sctp_assoc_value params;
+        struct sctp_sock *sp;
+        struct sctp_association *asoc;
         int val;
+        int assoc_id = 0;
 
-        if (optlen != sizeof(int))
+        if (optlen < sizeof(int))
                 return -EINVAL;
-        if (get_user(val, (int __user *)optval))
-                return -EFAULT;
 
-        if (val < 0)
+        if (optlen == sizeof(int)) {
+                printk(KERN_WARNING
+                   "SCTP: Use of int in max_burst socket option deprecated\n");
+                printk(KERN_WARNING
+                   "SCTP: Use struct sctp_assoc_value instead\n");
+                if (copy_from_user(&val, optval, optlen))
+                        return -EFAULT;
+        } else if (optlen == sizeof(struct sctp_assoc_value)) {
+                if (copy_from_user(&params, optval, optlen))
+                        return -EFAULT;
+                val = params.assoc_value;
+                assoc_id = params.assoc_id;
+        } else
                 return -EINVAL;
 
-        sctp_sk(sk)->max_burst = val;
+        sp = sctp_sk(sk);
+
+        if (assoc_id != 0) {
+                asoc = sctp_id2assoc(sk, assoc_id);
+                if (!asoc)
+                        return -EINVAL;
+                asoc->max_burst = val;
+        } else
+                sp->max_burst = val;
 
         return 0;
 }
@@ -5005,20 +5027,45 @@ static int sctp_getsockopt_maxburst(struct sock *sk, int len,
                                     char __user *optval,
                                     int __user *optlen)
 {
-        int val;
+        struct sctp_assoc_value params;
+        struct sctp_sock *sp;
+        struct sctp_association *asoc;
 
         if (len < sizeof(int))
                 return -EINVAL;
 
-        len = sizeof(int);
+        if (len == sizeof(int)) {
+                printk(KERN_WARNING
+                   "SCTP: Use of int in max_burst socket option deprecated\n");
+                printk(KERN_WARNING
+                   "SCTP: Use struct sctp_assoc_value instead\n");
+                params.assoc_id = 0;
+        } else if (len == sizeof (struct sctp_assoc_value)) {
+                if (copy_from_user(&params, optval, len))
+                        return -EFAULT;
+        } else
+                return -EINVAL;
 
-        val = sctp_sk(sk)->max_burst;
-        if (put_user(len, optlen))
-                return -EFAULT;
-        if (copy_to_user(optval, &val, len))
-                return -EFAULT;
+        sp = sctp_sk(sk);
+
+        if (params.assoc_id != 0) {
+                asoc = sctp_id2assoc(sk, params.assoc_id);
+                if (!asoc)
+                        return -EINVAL;
+                params.assoc_value = asoc->max_burst;
+        } else
+                params.assoc_value = sp->max_burst;
+
+        if (len == sizeof(int)) {
+                if (copy_to_user(optval, &params.assoc_value, len))
+                        return -EFAULT;
+        } else {
+                if (copy_to_user(optval, &params, len))
+                        return -EFAULT;
+        }
+
+        return 0;
 
-        return -ENOTSUPP;
 }
 
 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,