[Midnightbsd-cvs] [MidnightBSD/src] 511ecb: tcp: Correctly compute the retransmit length f...

[Lucas Holt]

  Branch: refs/heads/stable/2.2
  Home:   https://github.com/MidnightBSD/src
  Commit: 511ecb476b711ffb0572425c07baf280ad238aed
      https://github.com/MidnightBSD/src/commit/511ecb476b711ffb0572425c07baf280ad238aed
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2022-09-08 (Thu, 08 Sep 2022)

  Changed paths:
    M sys/netinet/tcp_output.c
    M sys/netinet/tcp_seq.h

  Log Message:
  -----------
      tcp: Correctly compute the retransmit length for all 64-bit platforms.

    When the TCP sequence number subtracted is greater than 2**32 minus
    the window size, or 2**31 minus the window size, the use of unsigned
    long as an intermediate variable, may result in an incorrect retransmit
    length computation on all 64-bit platforms.

    While at it create a helper macro to facilitate the computation of
    the difference between two TCP sequence numbers.

Obtained from: FreeBSD 11 stable / June 2022