[SCTP]: Include ulpevents in socket receive buffer accounting.

Also introduces a sysctl option to configure the receive buffer
accounting policy to be either at socket or association level.
Default is all the associations on the same socket share the
receive buffer.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 5f07ddb19554..dec68a604773 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -177,10 +177,10 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
          * RFC 6 - A SCTP receiver MUST be able to receive a minimum of
          * 1500 bytes in one SCTP packet.
          */
-        if (sk->sk_rcvbuf < SCTP_DEFAULT_MINWINDOW)
+        if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW)
                 asoc->rwnd = SCTP_DEFAULT_MINWINDOW;
         else
-                asoc->rwnd = sk->sk_rcvbuf;
+                asoc->rwnd = sk->sk_rcvbuf/2;
 
         asoc->a_rwnd = asoc->rwnd;
 
@@ -192,6 +192,9 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
         /* Set the sndbuf size for transmit.  */
         asoc->sndbuf_used = 0;
 
+        /* Initialize the receive memory counter */
+        atomic_set(&asoc->rmem_alloc, 0);
+
         init_waitqueue_head(&asoc->wait);
 
         asoc->c.my_vtag = sctp_generate_tag(ep);
@@ -400,6 +403,8 @@ static void sctp_association_destroy(struct sctp_association *asoc)
                 spin_unlock_bh(&sctp_assocs_id_lock);
         }
 
+        BUG_TRAP(!atomic_read(&asoc->rmem_alloc));
+
         if (asoc->base.malloced) {
                 kfree(asoc);
                 SCTP_DBG_OBJCNT_DEC(assoc);