diff options
-rw-r--r-- | net/sctp/socket.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 9f5fe23773a9..b14a8f33e42d 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c | |||
@@ -3010,14 +3010,21 @@ static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |||
3010 | } | 3010 | } |
3011 | 3011 | ||
3012 | /* | 3012 | /* |
3013 | * 7.1.25. Set or Get the sctp partial delivery point | 3013 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
3014 | * (SCTP_PARTIAL_DELIVERY_POINT) | 3014 | * (SCTP_PARTIAL_DELIVERY_POINT) |
3015 | * | ||
3015 | * This option will set or get the SCTP partial delivery point. This | 3016 | * This option will set or get the SCTP partial delivery point. This |
3016 | * point is the size of a message where the partial delivery API will be | 3017 | * point is the size of a message where the partial delivery API will be |
3017 | * invoked to help free up rwnd space for the peer. Setting this to a | 3018 | * invoked to help free up rwnd space for the peer. Setting this to a |
3018 | * lower value will cause partial delivery's to happen more often. The | 3019 | * lower value will cause partial deliveries to happen more often. The |
3019 | * calls argument is an integer that sets or gets the partial delivery | 3020 | * calls argument is an integer that sets or gets the partial delivery |
3020 | * point. | 3021 | * point. Note also that the call will fail if the user attempts to set |
3022 | * this value larger than the socket receive buffer size. | ||
3023 | * | ||
3024 | * Note that any single message having a length smaller than or equal to | ||
3025 | * the SCTP partial delivery point will be delivered in one single read | ||
3026 | * call as long as the user provided buffer is large enough to hold the | ||
3027 | * message. | ||
3021 | */ | 3028 | */ |
3022 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | 3029 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, |
3023 | char __user *optval, | 3030 | char __user *optval, |
@@ -3030,6 +3037,12 @@ static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |||
3030 | if (get_user(val, (int __user *)optval)) | 3037 | if (get_user(val, (int __user *)optval)) |
3031 | return -EFAULT; | 3038 | return -EFAULT; |
3032 | 3039 | ||
3040 | /* Note: We double the receive buffer from what the user sets | ||
3041 | * it to be, also initial rwnd is based on rcvbuf/2. | ||
3042 | */ | ||
3043 | if (val > (sk->sk_rcvbuf >> 1)) | ||
3044 | return -EINVAL; | ||
3045 | |||
3033 | sctp_sk(sk)->pd_point = val; | 3046 | sctp_sk(sk)->pd_point = val; |
3034 | 3047 | ||
3035 | return 0; /* is this the right error code? */ | 3048 | return 0; /* is this the right error code? */ |