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>

diff --git a/net/dccp/input.c b/net/dccp/input.c
index f91cf5ada306e07d07371a3c00addac7c7dbc270..7d230d14ce22307b80cd4cf53e41e6563fab7063 100644 (file)
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -160,13 +160,15 @@ 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)
@@ -365,21 +367,13 @@ 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);
@@ -631,14 +625,7 @@ 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);
        }