dccp ccid-2: Consolidate Ack-Vector processing within main DCCP module

This aggregates Ack Vector processing (handling input and clearing old state)
into one function, for the following reasons and benefits:
 * all Ack Vector-specific processing is now in one place;
 * duplicated code is removed;
 * ensuring sanity: from an Ack Vector point of view, it is better to clear the
                    old state first before entering new state;
 * Ack Event handling happens mostly within the CCIDs, not the main DCCP module.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>  

1 files changed, 9 insertions, 22 deletions

diff --git a/net/dccp/input.c b/net/dccp/input.c
index 77a5d57ab702..9a108ce17fc7 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -159,13 +159,15 @@ static void dccp_rcv_reset(struct sock *sk, struct sk_buff *skb)
         dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
 }
 
-static void dccp_event_ack_recv(struct sock *sk, struct sk_buff *skb)
+static void dccp_handle_ackvec_processing(struct sock *sk, struct sk_buff *skb)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
+        struct dccp_ackvec *av = dccp_sk(sk)->dccps_hc_rx_ackvec;
 
-        if (dp->dccps_hc_rx_ackvec != NULL)
-                dccp_ackvec_clear_state(dp->dccps_hc_rx_ackvec,
-                                        DCCP_SKB_CB(skb)->dccpd_ack_seq);
+        if (av == NULL)
+                return;
+        if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
+                dccp_ackvec_clear_state(av, DCCP_SKB_CB(skb)->dccpd_ack_seq);
+        dccp_ackvec_input(av, skb);
 }
 
 static void dccp_deliver_input_to_ccids(struct sock *sk, struct sk_buff *skb)
@@ -364,21 +366,13 @@ discard:
 int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
                          const struct dccp_hdr *dh, const unsigned len)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-
         if (dccp_check_seqno(sk, skb))
                 goto discard;
 
         if (dccp_parse_options(sk, NULL, skb))
                 return 1;
 
-        if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
-                dccp_event_ack_recv(sk, skb);
-
-        if (dp->dccps_hc_rx_ackvec != NULL &&
-            dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
-                            DCCP_SKB_CB(skb)->dccpd_seq, DCCPAV_RECEIVED))
-                goto discard;
+        dccp_handle_ackvec_processing(sk, skb);
         dccp_deliver_input_to_ccids(sk, skb);
 
         return __dccp_rcv_established(sk, skb, dh, len);
@@ -621,14 +615,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 if (dccp_parse_options(sk, NULL, skb))
                         return 1;
 
-                if (dcb->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
-                        dccp_event_ack_recv(sk, skb);
-
-                if (dp->dccps_hc_rx_ackvec != NULL &&
-                    dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
-                                    DCCP_SKB_CB(skb)->dccpd_seq, DCCPAV_RECEIVED))
-                        goto discard;
-
+                dccp_handle_ackvec_processing(sk, skb);
                 dccp_deliver_input_to_ccids(sk, skb);
         }