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| author |  Priyaranjan Jha <priyarjha@google.com>
| 2020-09-24 15:23:14 -0700 |
|---|---|---|
| committer |  David S. Miller <davem@davemloft.net>
| 2020-09-24 20:15:45 -0700 |
| commit | ad2b9b0f8d0107602bdc1f3b1ab90719842ace11 (patch) | |
| tree | 13eee63f3542682121acde3c014c7d3423d58456 /net/ipv4/proc.c | |
| parent | net/fsl: quieten expected MDIO access failures (diff) | |
| download | linux-ad2b9b0f8d0107602bdc1f3b1ab90719842ace11.tar.gz linux-ad2b9b0f8d0107602bdc1f3b1ab90719842ace11.tar.bz2 linux-ad2b9b0f8d0107602bdc1f3b1ab90719842ace11.zip | |
tcp: skip DSACKs with dubious sequence ranges
Currently, we use length of DSACKed range to compute number of
delivered packets. And if sequence range in DSACK is corrupted,
we can get bogus dsacked/acked count, and bogus cwnd.
This patch put bounds on DSACKed range to skip update of data
delivery and spurious retransmission information, if the DSACK
is unlikely caused by sender's action:
- DSACKed range shouldn't be greater than maximum advertised rwnd.
- Total no. of DSACKed segments shouldn't be greater than total
no. of retransmitted segs. Unlike spurious retransmits, network
duplicates or corrupted DSACKs shouldn't be counted as delivery.
Signed-off-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/proc.c')
| -rw-r--r-- | net/ipv4/proc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 1074df726ec0..8d5e1695b9aa 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -293,6 +293,7 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH), SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH), SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS), + SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS), SNMP_MIB_SENTINEL }; |