sctp: Export sctp_do_peeloff

lookup sctp_association within sctp_do_peeloff() to enable its use outside of
the sctp code with minimal knowledge of the former.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 15 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 408ebd0e7330..06b42b7f5a02 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4170,14 +4170,16 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
 }
 
 /* Helper routine to branch off an association to a new socket.  */
-SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
-                                struct socket **sockp)
+int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
 {
-        struct sock *sk = asoc->base.sk;
+        struct sctp_association *asoc = sctp_id2assoc(sk, id);
         struct socket *sock;
         struct sctp_af *af;
         int err = 0;
 
+        if (!asoc)
+                return -EINVAL;
+
         /* An association cannot be branched off from an already peeled-off
          * socket, nor is this supported for tcp style sockets.
          */
@@ -4206,13 +4208,13 @@ SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
 
         return err;
 }
+EXPORT_SYMBOL(sctp_do_peeloff);
 
 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
 {
         sctp_peeloff_arg_t peeloff;
         struct socket *newsock;
         int retval = 0;
-        struct sctp_association *asoc;
 
         if (len < sizeof(sctp_peeloff_arg_t))
                 return -EINVAL;
@@ -4220,15 +4222,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
         if (copy_from_user(&peeloff, optval, len))
                 return -EFAULT;
 
-        asoc = sctp_id2assoc(sk, peeloff.associd);
-        if (!asoc) {
-                retval = -EINVAL;
-                goto out;
-        }
-
-        SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
-
-        retval = sctp_do_peeloff(asoc, &newsock);
+        retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
         if (retval < 0)
                 goto out;
 
@@ -4239,8 +4233,8 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
                 goto out;
         }
 
-        SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
-                          __func__, sk, asoc, newsock->sk, retval);
+        SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
+                          __func__, sk, newsock->sk, retval);
 
         /* Return the fd mapped to the new socket.  */
         peeloff.sd = retval;