diff options
| author | Priyaranjan Jha <priyarjha@google.com> | 2017-11-03 17:46:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-05 23:16:50 +0900 |
| commit | d09b9e60e06d431b008a878c4b1d48d6cce816ef (patch) | |
| tree | 9103eaddfa036339503e084546d0d8d3c9fcad47 | |
| parent | 8f7dc9ae4a7aece9fbc3e6637bdfa38b36bcdf09 (diff) | |
tcp: fix DSACK-based undo on non-duplicate ACK
Fixes DSACK-based undo when sender is in Open State and
an ACK advances snd_una.
Example scenario:
- Sender goes into recovery and makes some spurious rtx.
- It comes out of recovery and enters into open state.
- It sends some more packets, let's say 4.
- The receiver sends an ACK for the first two, but this ACK is lost.
- The sender receives ack for first two, and DSACK for previous
spurious rtx.
Signed-off-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yousuk Seung <ysseung@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 5a87a00641d3..b2fc7163bd40 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -115,7 +115,7 @@ int sysctl_tcp_invalid_ratelimit __read_mostly = HZ/2; #define FLAG_ACKED (FLAG_DATA_ACKED|FLAG_SYN_ACKED) #define FLAG_NOT_DUP (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED) -#define FLAG_CA_ALERT (FLAG_DATA_SACKED|FLAG_ECE) +#define FLAG_CA_ALERT (FLAG_DATA_SACKED|FLAG_ECE|FLAG_DSACKING_ACK) #define FLAG_FORWARD_PROGRESS (FLAG_ACKED|FLAG_DATA_SACKED) #define TCP_REMNANT (TCP_FLAG_FIN|TCP_FLAG_URG|TCP_FLAG_SYN|TCP_FLAG_PSH) |