[Bug 250357] [tcp] RFC 5961 is not implemented completely

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250357

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=1ce8cf6f7bdf5e9f8e497be5e3c54767fa0a7cf8

commit 1ce8cf6f7bdf5e9f8e497be5e3c54767fa0a7cf8
Author:     Michael Tuexen <tuexen@FreeBSD.org>
AuthorDate: 2024-07-21 09:37:35 +0000
Commit:     Michael Tuexen <tuexen@FreeBSD.org>
CommitDate: 2024-08-03 23:05:13 +0000

    tcp: improve SEG.ACK validation

    Implement the improved SEG.ACK validation described in RFC 5961.
    In addition to that, also detect ghost ACKs, which are ACKs for data
    that has never been sent.
    The additional checks are enabled by default, but can be disabled
    by setting the sysctl-variable net.inet.tcp.insecure_ack to a
    non-zero value.

    PR:                     250357
    Reviewed by:            Peter Lei, rscheff (older version)
    Sponsored by:           Netflix, Inc.
    Differential Revision:  https://reviews.freebsd.org/D45894

    (cherry picked from commit 646c28ea80cb0f9258386626297495b5a0e56db5)

 share/man/man4/tcp.4          |  5 ++++-
 sys/netinet/tcp_input.c       | 44 +++++++++++++++++++++++++++++++++++++++++++
 sys/netinet/tcp_stacks/bbr.c  | 37 ++++++++++++++++++++++++++++++++++++
 sys/netinet/tcp_stacks/rack.c | 39 ++++++++++++++++++++++++++++++++++++++
 sys/netinet/tcp_var.h         |  8 +++++++-
 usr.bin/netstat/inet.c        |  8 ++++++--
 6 files changed, 137 insertions(+), 4 deletions(-)

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