[PATCH net-next 08/24] sctp: use SCTP_FUTURE_ASSOC for SCTP_PR_SUPPORTED sockopt

[Xin Long]

Check with SCTP_FUTURE_ASSOC instead in
sctp_set/getsockopt_pr_supported, it's compatible with 0.

It also adjusts some code to keep a same check form as other functions.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/sctp/socket.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1d49b7d..9e2b153 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3965,6 +3965,7 @@ static int sctp_setsockopt_pr_supported(struct sock *sk,
                                        unsigned int optlen)
 {
        struct sctp_assoc_value params;
+       struct sctp_association *asoc;
 
        if (optlen != sizeof(params))
                return -EINVAL;
@@ -3972,6 +3973,11 @@ static int sctp_setsockopt_pr_supported(struct sock *sk,
        if (copy_from_user(&params, optval, optlen))
                return -EFAULT;
 
+       asoc = sctp_id2assoc(sk, params.assoc_id);
+       if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
+           sctp_style(sk, UDP))
+               return -EINVAL;
+
        sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
 
        return 0;
@@ -7084,17 +7090,15 @@ static int sctp_getsockopt_pr_supported(struct sock 
*sk, int len,
                goto out;
 
        asoc = sctp_id2assoc(sk, params.assoc_id);
-       if (asoc) {
-               params.assoc_value = asoc->prsctp_enable;
-       } else if (!params.assoc_id) {
-               struct sctp_sock *sp = sctp_sk(sk);
-
-               params.assoc_value = sp->ep->prsctp_enable;
-       } else {
+       if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
+           sctp_style(sk, UDP)) {
                retval = -EINVAL;
                goto out;
        }
 
+       params.assoc_value = asoc ? asoc->prsctp_enable
+                                 : sctp_sk(sk)->ep->prsctp_enable;
+
        if (put_user(len, optlen))
                goto out;
 
-- 
2.1.0