[DCCP] CCID: Improve CCID infrastructure

1. No need for ->ccid_init nor ->ccid_exit, this is what module_{init,exit}
   does and anynways neither ccid2 nor ccid3 were using it.

2. Rename struct ccid to struct ccid_operations and introduce struct ccid
   with a pointer to ccid_operations and rigth after it the rx or tx
   private state.

3. Remove the pointer to the state of the half connections from struct
   dccp_sock, now its derived thru ccid_priv() from the ccid pointer.

Now we also can implement the setsockopt for changing the CCID easily as
no ccid init routines can affect struct dccp_sock in any way that prevents
other CCIDs from working if a CCID switch operation is asked by apps.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 15 deletions

diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index 9e1de59..5324fca 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -121,23 +121,21 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
 		if (newdp->dccps_options.dccpo_send_ack_vector) {
 			newdp->dccps_hc_rx_ackvec =
 						dccp_ackvec_alloc(GFP_ATOMIC);
-			/*
-			 * XXX: We're using the same CCIDs set on the parent,
-			 * i.e. sk_clone copied the master sock and left the
-			 * CCID pointers for this child, that is why we do the
-			 * __ccid_get calls.
-			 */
 			if (unlikely(newdp->dccps_hc_rx_ackvec == NULL))
 				goto out_free;
 		}
 
-		if (unlikely(ccid_hc_rx_init(newdp->dccps_hc_rx_ccid,
-					     newsk) != 0 ||
-			     ccid_hc_tx_init(newdp->dccps_hc_tx_ccid,
-				     	     newsk) != 0)) {
+		newdp->dccps_hc_rx_ccid =
+			    ccid_hc_rx_new(newdp->dccps_options.dccpo_rx_ccid,
+					   newsk, GFP_ATOMIC);
+		newdp->dccps_hc_tx_ccid =
+			    ccid_hc_tx_new(newdp->dccps_options.dccpo_tx_ccid,
+					   newsk, GFP_ATOMIC);
+		if (unlikely(newdp->dccps_hc_rx_ccid == NULL ||
+			     newdp->dccps_hc_tx_ccid == NULL)) {
 			dccp_ackvec_free(newdp->dccps_hc_rx_ackvec);
-			ccid_hc_rx_exit(newdp->dccps_hc_rx_ccid, newsk);
-			ccid_hc_tx_exit(newdp->dccps_hc_tx_ccid, newsk);
+			ccid_hc_rx_delete(newdp->dccps_hc_rx_ccid, newsk);
+			ccid_hc_tx_delete(newdp->dccps_hc_tx_ccid, newsk);
 out_free:
 			/* It is still raw copy of parent, so invalidate
 			 * destructor and make plain sk_free() */
@@ -146,9 +144,6 @@ out_free:
 			return NULL;
 		}
 
-		__ccid_get(newdp->dccps_hc_rx_ccid);
-		__ccid_get(newdp->dccps_hc_tx_ccid);
-
 		/*
 		 * Step 3: Process LISTEN state
 		 *