[DCCP]: Transition from PARTOPEN to OPEN when receiving DATA packets

Noticed by Andrea Bittau, that provided a patch that was modified to
not transition from RESPOND to OPEN when receiving DATA packets.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/net/dccp/input.c b/net/dccp/input.c
index 1b6b2cb12376..3454d5941900 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -375,6 +375,9 @@ static int dccp_rcv_respond_partopen_state_process(struct sock *sk,
         case DCCP_PKT_RESET:
                 inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
                 break;
+        case DCCP_PKT_DATA:
+                if (sk->sk_state == DCCP_RESPOND)
+                        break;
         case DCCP_PKT_DATAACK:
         case DCCP_PKT_ACK:
                 /*
@@ -393,7 +396,8 @@ static int dccp_rcv_respond_partopen_state_process(struct sock *sk,
                 dccp_sk(sk)->dccps_osr = DCCP_SKB_CB(skb)->dccpd_seq;
                 dccp_set_state(sk, DCCP_OPEN);
 
-                if (dh->dccph_type == DCCP_PKT_DATAACK) {
+                if (dh->dccph_type == DCCP_PKT_DATAACK ||
+                    dh->dccph_type == DCCP_PKT_DATA) {
                         dccp_rcv_established(sk, skb, dh, len);
                         queued = 1; /* packet was queued
                                        (by dccp_rcv_established) */