[SCTP] Minor changes for tcp-style socket support.

include/net/sctp/constants.h

@@ -210,14 +210,19 @@ typedef enum {
 
 /* These are values for sk->state.
  * For a UDP-style SCTP socket, the states are defined as follows
- *   (at this point of time, may change later after more discussions: FIXME)
- * A socket in SCTP_SS_UNCONNECTED state indicates that it is not willing
- * to accept new associations, but it can initiate the creation of new
- * ones.
- * A socket in SCTP_SS_LISTENING state indicates that it is willing to
+ * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
+ *   accept new associations, but it can initiate the creation of new ones.
+ * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
  *   accept new  associations and can initiate the creation of new ones.
- * A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
+ * - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
  *   socket with one association.
+ * For a TCP-style SCTP socket, the states are defined as follows
+ * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
+ *   accept new associations, but it can initiate the creation of new ones.
+ * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
+ *   accept new associations, but cannot initiate the creation of new ones.
+ * - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single 
+ *   association in ESTABLISHED state.
  */
 typedef enum {
 	SCTP_SS_CLOSED         = TCP_CLOSE,

net/sctp/sm_sideeffect.c

@@ -105,8 +105,7 @@ static void sctp_cmd_new_state(sctp_cmd_seq_t *, sctp_association_t *,
 #define DEBUG_POST_SFX \
 	SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
 			  error, asoc, \
-			  sctp_state_tbl[sctp_id2assoc(ep->base.sk, \
-			  sctp_assoc2id(asoc))?asoc->state:SCTP_STATE_CLOSED])
+			  sctp_state_tbl[asoc?asoc->state:SCTP_STATE_CLOSED])
 
 /*
  * This is the master state machine processing function.
@@ -1239,12 +1238,19 @@ static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, sctp_association_t *asoc,
 			wake_up_interruptible(&asoc->wait);
 
 		/* Wake up any processes waiting in the sk's sleep queue of
-		 * a tcp-style or udp-style peeled-off socket in
+		 * a TCP-style or UDP-style peeled-off socket in
 		 * sctp_wait_for_accept() or sctp_wait_for_packet().
-		 * For a udp-style socket, the waiters are woken up by the
+		 * For a UDP-style socket, the waiters are woken up by the
 		 * notifications.
 		 */
-		if (sp->type != SCTP_SOCKET_UDP)
+		if (SCTP_SOCKET_UDP != sp->type)
 			sk->state_change(sk);
 	}
+
+	/* Change the sk->state of a TCP-style socket that has sucessfully
+	 * completed a connect() call.
+	 */
+	if ((SCTP_STATE_ESTABLISHED == asoc->state) &&
+	    (SCTP_SOCKET_TCP == sp->type) && (SCTP_SS_CLOSED == sk->state))
+	    sk->state = SCTP_SS_ESTABLISHED;
 }

net/sctp/socket.c

@@ -1563,8 +1563,14 @@ SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *uaddr,
 	sp = sctp_sk(sk);
 	ep = sp->ep;
 
-	/* connect() cannot be done on a peeled-off socket. */
-	if (SCTP_SOCKET_UDP_HIGH_BANDWIDTH == sp->type) {
+	/* connect() cannot be done on a socket that is already in ESTABLISHED
+	 * state - UDP-style peeled off socket or a TCP-style socket that
+	 * is already connected. 
+	 * It cannot be done even on a TCP-style listening socket.
+	 */
+	if ((SCTP_SS_ESTABLISHED == sk->state) ||
+	    ((SCTP_SOCKET_TCP == sp->type) &&
+	     (SCTP_SS_LISTENING == sk->state))) {
 		err = -EISCONN;
 		goto out_unlock;
 	}