diff options
| -rw-r--r-- | net/ipv4/tcp_input.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index aaf6f66677f..69f9f1ef3ef 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -953,7 +953,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ int prior_fackets; u32 lost_retrans = 0; int flag = 0; - int dup_sack = 0; + int found_dup_sack = 0; int cached_fack_count; int i; int first_sack_index; @@ -964,20 +964,20 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ /* Check for D-SACK. */ if (before(ntohl(sp[0].start_seq), TCP_SKB_CB(ack_skb)->ack_seq)) { - dup_sack = 1; + found_dup_sack = 1; tp->rx_opt.sack_ok |= 4; NET_INC_STATS_BH(LINUX_MIB_TCPDSACKRECV); } else if (num_sacks > 1 && !after(ntohl(sp[0].end_seq), ntohl(sp[1].end_seq)) && !before(ntohl(sp[0].start_seq), ntohl(sp[1].start_seq))) { - dup_sack = 1; + found_dup_sack = 1; tp->rx_opt.sack_ok |= 4; NET_INC_STATS_BH(LINUX_MIB_TCPDSACKOFORECV); } /* D-SACK for already forgotten data... * Do dumb counting. */ - if (dup_sack && + if (found_dup_sack && !after(ntohl(sp[0].end_seq), prior_snd_una) && after(ntohl(sp[0].end_seq), tp->undo_marker)) tp->undo_retrans--; @@ -1058,6 +1058,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ __u32 start_seq = ntohl(sp->start_seq); __u32 end_seq = ntohl(sp->end_seq); int fack_count; + int dup_sack = (found_dup_sack && (i == first_sack_index)); skb = cached_skb; fack_count = cached_fack_count; |