dccp: Remove obsolete parts of the old CCID interface

The TX/RX CCIDs of the minisock are now redundant: similar to the Ack Vector
case, their value equals initially that of the sysctl, but at the end of
feature negotiation may be something different.

The old interface removed by this patch thus has been replaced by the newer
interface to dynamically query the currently loaded CCIDs earlier in this
patch set.

Also removed the constructors for the TX CCID and the RX CCID, since the
switch rx/non-rx is done by the handler in minisocks.c (and the handler is
the only place in the code where CCIDs are loaded).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>

6 files changed, 3 insertions, 38 deletions

diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index 610083ff73f6..a203d132dbef 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -140,10 +140,11 @@ send_ackvec = 1
         Whether or not to send Ack Vector options (sec. 11.5).
 
 tx_ccid = 2
-        Default CCID for the sender-receiver half-connection.
+        Default CCID for the sender-receiver half-connection. Depending on the
+        choice of CCID, the Send Ack Vector feature is enabled automatically.
 
 rx_ccid = 2
-        Default CCID for the receiver-sender half-connection.
+        Default CCID for the receiver-sender half-connection; see tx_ccid.
 
 seq_window = 100
         The initial sequence window (sec. 7.5.2).
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 6a72ff52a8a4..46daea312d92 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -370,7 +370,6 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
   * Will be used to pass the state from dccp_request_sock to dccp_sock.
   *
   * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
-  * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
   * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
   * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
   * @dccpms_pending - List of features being negotiated
@@ -378,8 +377,6 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
   */
 struct dccp_minisock {
         __u64                   dccpms_sequence_window;
-        __u8                    dccpms_rx_ccid;
-        __u8                    dccpms_tx_ccid;
         __u8                    dccpms_send_ack_vector;
         __u8                    dccpms_send_ndp_count;
         struct list_head        dccpms_pending;
diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c
index f72ca83df552..330372a1a0b6 100644
--- a/net/dccp/ccid.c
+++ b/net/dccp/ccid.c
@@ -253,20 +253,6 @@ out_module_put:
 
 EXPORT_SYMBOL_GPL(ccid_new);
 
-struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk, gfp_t gfp)
-{
-        return ccid_new(id, sk, 1, gfp);
-}
-
-EXPORT_SYMBOL_GPL(ccid_hc_rx_new);
-
-struct ccid *ccid_hc_tx_new(unsigned char id,struct sock *sk,  gfp_t gfp)
-{
-        return ccid_new(id, sk, 0, gfp);
-}
-
-EXPORT_SYMBOL_GPL(ccid_hc_tx_new);
-
 static void ccid_delete(struct ccid *ccid, struct sock *sk, int rx)
 {
         struct ccid_operations *ccid_ops;
diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 803343aed004..18f69423a708 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -111,11 +111,6 @@ extern int  ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
                              gfp_t gfp);
 
-extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
-                                   gfp_t gfp);
-extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
-                                   gfp_t gfp);
-
 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
 {
         struct ccid *ccid = dp->dccps_hc_rx_ccid;
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 6c82dea409d9..cb2ddd2b894b 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -1119,18 +1119,6 @@ int dccp_feat_init(struct sock *sk)
         INIT_LIST_HEAD(&dmsk->dccpms_pending);  /* XXX no longer used */
         INIT_LIST_HEAD(&dmsk->dccpms_conf);     /* XXX no longer used */
 
-        /* CCID L */
-        rc = __feat_register_sp(&dp->dccps_featneg, DCCPF_CCID, 1, 0,
-                                &dmsk->dccpms_tx_ccid, 1);
-        if (rc)
-                goto out;
-
-        /* CCID R */
-        rc = __feat_register_sp(&dp->dccps_featneg, DCCPF_CCID, 0, 0,
-                                &dmsk->dccpms_rx_ccid, 1);
-        if (rc)
-                goto out;
-
         /* Ack ratio */
         rc = __feat_register_nn(&dp->dccps_featneg, DCCPF_ACK_RATIO, 0,
                                 dp->dccps_l_ack_ratio);
diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index 258195972bce..486d61df2604 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -45,8 +45,6 @@ EXPORT_SYMBOL_GPL(dccp_death_row);
 void dccp_minisock_init(struct dccp_minisock *dmsk)
 {
         dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window;
-        dmsk->dccpms_rx_ccid         = sysctl_dccp_feat_rx_ccid;
-        dmsk->dccpms_tx_ccid         = sysctl_dccp_feat_tx_ccid;
         dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector;
         dmsk->dccpms_send_ndp_count  = sysctl_dccp_feat_send_ndp_count;
 }