lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 13 Mar 2018 12:25:06 +0200
From:   Ilpo Järvinen <>
Cc:     Yuchung Cheng <>,
        Neal Cardwell <>,
        Eric Dumazet <>,
        Sergei Shtylyov <>
Subject: [PATCH v3 net 0/5] tcp: fixes to non-SACK TCP

Here is a series of fixes to issues that occur when SACK is not
enabled for a TCP connection. These are not fixes to just some
remote corner cases of recovery but many/almost all recoveries
without SACK will be impacted by one (or even more than one) of
them. The sender-side changes (1-4) are not mainly, if any, to
improve performance (throughput) but address correctness
(congestion control responses should not get incorrectly
reverted) and burstiness (that may cause additional problems
later as some of the packets in such bursts may get dropped
needing again to resort to loss recovery that is likely
similarly bursty).

v1 -> v2:
- Tried to improve changelogs
- Reworked FRTO undo fix location
- Removed extra parenthesis from EXPR (and while at it, reverse
  also the sides of &&)
- Pass prior_snd_una rather than flag around to avoid moving
  tcp_packet_delayed call
- Pass tp instead of sk. Sk was there only due to a subsequent
  change (that I think is only net-next material) limiting the
  use of the transient state to only RTO recoveries as it won't
  be needed after NewReno recovery that won't do unnecessary
  rexmits like the non-SACK RTO recovery does

v2 -> v3:
- Remove unnecessarily added braces

tcp: feed correct number of pkts acked to cc
tcp: prevent bogus FRTO undos with non-SACK flows
tcp: move false FR condition into
tcp: prevent bogus undos when SACK is not enabled
tcp: send real dupACKs by locking advertized

Powered by blists - more mailing lists