Lock down a socket, milestone 1.

o Add a mutex (sb_mtx) to struct sockbuf. This protects the data in a
  socket buffer. The mutex in the receive buffer also protects the data
  in struct socket.

o Determine the lock strategy for each members in struct socket.

o Lock down the following members:

  - so_count
  - so_options
  - so_linger
  - so_state

o Remove *_locked() socket APIs.  Make the following socket APIs
  touching the members above now require a locked socket:

 - sodisconnect()
 - soisconnected()
 - soisconnecting()
 - soisdisconnected()
 - soisdisconnecting()
 - sofree()
 - soref()
 - sorele()
 - sorwakeup()
 - sotryfree()
 - sowakeup()
 - sowwakeup()

Reviewed by:	alfred

1 files changed, 9 insertions, 1 deletions

diff --git a/sys/netatalk/ddp_usrreq.c b/sys/netatalk/ddp_usrreq.c
index fa79cec..63932cc 100644
--- a/sys/netatalk/ddp_usrreq.c
+++ b/sys/netatalk/ddp_usrreq.c
@@ -110,8 +110,11 @@ ddp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 	s = splnet();
 	error = at_pcbconnect( ddp, nam, td );
 	splx(s);
-	if ( error == 0 )
+	if ( error == 0 ) {
+	    SOCK_LOCK( so );
 	    soisconnected( so );
+	    SOCK_UNLOCK( so );
+	}
 	return(error);
 }
 
@@ -134,7 +137,9 @@ ddp_disconnect(struct socket *so)
 	at_pcbdisconnect( ddp );
 	ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE;
 	splx(s);
+	SOCK_LOCK( so );
 	soisdisconnected( so );
+	SOCK_UNLOCK( so );
 	return(0);
 }
 
@@ -204,7 +209,9 @@ ddp_abort(struct socket *so)
 	if ( ddp == NULL ) {
 		return(EINVAL);
 	}
+	SOCK_LOCK( so );
 	soisdisconnected( so );
+	SOCK_UNLOCK( so );
 	s = splnet();
 	at_pcbdetach( so, ddp );
 	splx(s);
@@ -440,6 +447,7 @@ at_pcballoc( struct socket *so )
 static void
 at_pcbdetach( struct socket *so, struct ddpcb *ddp)
 {
+    SOCK_LOCK( so );
     soisdisconnected( so );
     so->so_pcb = 0;
     sotryfree(so);