aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--net/dccp/input.c68
1 files changed, 33 insertions, 35 deletions
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 9a108ce17fc..b1e38bf9445 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -603,22 +603,36 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
/* Caller (dccp_v4_do_rcv) will send Reset */
dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
return 1;
+ } else if (sk->sk_state == DCCP_CLOSED) {
+ dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
+ return 1;
}
- if (sk->sk_state != DCCP_REQUESTING && sk->sk_state != DCCP_RESPOND) {
- if (dccp_check_seqno(sk, skb))
- goto discard;
-
- /*
- * Step 8: Process options and mark acknowledgeable
- */
- if (dccp_parse_options(sk, NULL, skb))
- return 1;
+ /* Step 6: Check sequence numbers (omitted in LISTEN/REQUEST state) */
+ if (sk->sk_state != DCCP_REQUESTING && dccp_check_seqno(sk, skb))
+ goto discard;
- dccp_handle_ackvec_processing(sk, skb);
- dccp_deliver_input_to_ccids(sk, skb);
+ /*
+ * Step 7: Check for unexpected packet types
+ * If (S.is_server and P.type == Response)
+ * or (S.is_client and P.type == Request)
+ * or (S.state == RESPOND and P.type == Data),
+ * Send Sync packet acknowledging P.seqno
+ * Drop packet and return
+ */
+ if ((dp->dccps_role != DCCP_ROLE_CLIENT &&
+ dh->dccph_type == DCCP_PKT_RESPONSE) ||
+ (dp->dccps_role == DCCP_ROLE_CLIENT &&
+ dh->dccph_type == DCCP_PKT_REQUEST) ||
+ (sk->sk_state == DCCP_RESPOND && dh->dccph_type == DCCP_PKT_DATA)) {
+ dccp_send_sync(sk, dcb->dccpd_seq, DCCP_PKT_SYNC);
+ goto discard;
}
+ /* Step 8: Process options */
+ if (dccp_parse_options(sk, NULL, skb))
+ return 1;
+
/*
* Step 9: Process Reset
* If P.type == Reset,
@@ -626,41 +640,21 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
* S.state := TIMEWAIT
* Set TIMEWAIT timer
* Drop packet and return
- */
+ */
if (dh->dccph_type == DCCP_PKT_RESET) {
dccp_rcv_reset(sk, skb);
return 0;
- /*
- * Step 7: Check for unexpected packet types
- * If (S.is_server and P.type == Response)
- * or (S.is_client and P.type == Request)
- * or (S.state == RESPOND and P.type == Data),
- * Send Sync packet acknowledging P.seqno
- * Drop packet and return
- */
- } else if ((dp->dccps_role != DCCP_ROLE_CLIENT &&
- dh->dccph_type == DCCP_PKT_RESPONSE) ||
- (dp->dccps_role == DCCP_ROLE_CLIENT &&
- dh->dccph_type == DCCP_PKT_REQUEST) ||
- (sk->sk_state == DCCP_RESPOND &&
- dh->dccph_type == DCCP_PKT_DATA)) {
- dccp_send_sync(sk, dcb->dccpd_seq, DCCP_PKT_SYNC);
- goto discard;
- } else if (dh->dccph_type == DCCP_PKT_CLOSEREQ) {
+ } else if (dh->dccph_type == DCCP_PKT_CLOSEREQ) { /* Step 13 */
if (dccp_rcv_closereq(sk, skb))
return 0;
goto discard;
- } else if (dh->dccph_type == DCCP_PKT_CLOSE) {
+ } else if (dh->dccph_type == DCCP_PKT_CLOSE) { /* Step 14 */
if (dccp_rcv_close(sk, skb))
return 0;
goto discard;
}
switch (sk->sk_state) {
- case DCCP_CLOSED:
- dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
- return 1;
-
case DCCP_REQUESTING:
queued = dccp_rcv_request_sent_state_process(sk, skb, dh, len);
if (queued >= 0)
@@ -669,8 +663,12 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
__kfree_skb(skb);
return 0;
- case DCCP_RESPOND:
case DCCP_PARTOPEN:
+ /* Step 8: if using Ack Vectors, mark packet acknowledgeable */
+ dccp_handle_ackvec_processing(sk, skb);
+ dccp_deliver_input_to_ccids(sk, skb);
+ /* fall through */
+ case DCCP_RESPOND:
queued = dccp_rcv_respond_partopen_state_process(sk, skb,
dh, len);
break;