netinet: default mib counter probe points off

Disable the IP/IP6/ICMP/... counter probe points by default.
They are kept enabled in debug builds, and can be enabled with
'options KDTRACE_MIB_SDT'.

netinet: default mib counter probe points off

Disable the IP/IP6/ICMP/... counter probe points by default.
They are kept enabled in debug builds, and can be enabled with
'options KDTRACE_MIB_SDT'.

Requested by: glebius
Reviewed by: glebius
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D47657

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netipsec: add probe points for the ipsec/esp/ah/ipcomp counters

Extend what we did for netinet counters in 60d8dbbef075 (netinet: add a probe
point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counte

netipsec: add probe points for the ipsec/esp/ah/ipcomp counters

Extend what we did for netinet counters in 60d8dbbef075 (netinet: add a probe
point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counters, 2024-01-18) to the
IPsec code.

Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D46416

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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 ad

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)
MFC after: 1 week
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D45894

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tcp: add counter to track when SACK loss recovery uses TSO

Add a counter to track how frequently SACK has transmitted
more than one MSS using TSO. Instances when this will be
beneficial is the use o

tcp: add counter to track when SACK loss recovery uses TSO

Add a counter to track how frequently SACK has transmitted
more than one MSS using TSO. Instances when this will be
beneficial is the use of PRR, or when ACK thinning due to
GRO/LRO or ACK discards by the network are present.

Reviewed By: tuexen, #transport
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D45070

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netinet: add a probe point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counters

When debugging network issues one common clue is an unexpectedly
incrementing error counter. This is helpful, in that

netinet: add a probe point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counters

When debugging network issues one common clue is an unexpectedly
incrementing error counter. This is helpful, in that it gives us an
idea of what might be going wrong, but often these counters may be
incremented in different functions.

Add a static probe point for them so that we can use dtrace to get
futher information (e.g. a stack trace).

For example:
dtrace -n 'mib:ip:count: { printf("%d", arg0); stack(); }'

This can be disabled by setting the following kernel option:
options KDTRACE_NO_MIB_SDT

Reviewed by: gallatin, tuexen (previous version), gnn (previous version)
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D43504

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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tcp: retire TCPDEBUG

This subsystem is superseded by modern debugging facilities,
e.g. DTrace probes and TCP black box logging.

We intentionally leave SO_DEBUG in place, as many utilities may
set i

tcp: retire TCPDEBUG

This subsystem is superseded by modern debugging facilities,
e.g. DTrace probes and TCP black box logging.

We intentionally leave SO_DEBUG in place, as many utilities may
set it on a socket. Also the tcp::debug DTrace probes look at
this flag on a socket.

Reviewed by: gnn, tuexen
Discussed with: rscheff, rrs, jtl
Differential revision: https://reviews.freebsd.org/D37694

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Separate out SCTP related dtrace code.
This is based on work done by markj@.

Discussed with: markj@
MFC after: 3 days

Merge ^/head r338026 through r338297, and resolve conflicts.

Add support for send, receive and state-change DTrace providers for
SCTP. They are based on what is specified in the Solaris DTrace manual
for Solaris 11.4.

Reviewed by: 0mp, dteske, markj
Relnotes

Add support for send, receive and state-change DTrace providers for
SCTP. They are based on what is specified in the Solaris DTrace manual
for Solaris 11.4.

Reviewed by: 0mp, dteske, markj
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D16839

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MFH @ r337607, in preparation for boarding

Merge ^/head r336870 through r337285, and resolve conflicts.

Add a dtrace provider for UDP-Lite.

The dtrace provider for UDP-Lite is modeled after the UDP provider.
This fixes the bug that UDP-Lite packets were triggering the UDP
provider.
Thanks to dteske@ f

Add a dtrace provider for UDP-Lite.

The dtrace provider for UDP-Lite is modeled after the UDP provider.
This fixes the bug that UDP-Lite packets were triggering the UDP
provider.
Thanks to dteske@ for providing the dwatch module.

Reviewed by: dteske@, markj@, rrs@
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D16377

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sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
pro

sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

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Use estimated RTT for receive buffer auto resizing instead of timestamps

Switched from using timestamps to RTT estimates when performing TCP receive
buffer auto resizing, as not all hosts support /

Use estimated RTT for receive buffer auto resizing instead of timestamps

Switched from using timestamps to RTT estimates when performing TCP receive
buffer auto resizing, as not all hosts support / enable TCP timestamps.

Disabled reset of receive buffer auto scaling when not in bulk receive mode,
which gives an extra 20% performance increase.

Also extracted auto resizing to a common method shared between standard and
fastpath modules.

With this AWS S3 downloads at ~17ms latency on a 1Gbps connection jump from
~3MB/s to ~100MB/s using the default settings.

Reviewed by: lstewart, gnn
MFC after: 2 weeks
Relnotes: Yes
Sponsored by: Multiplay
Differential Revision: https://reviews.freebsd.org/D9668

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

MFH @r292599

This includes the pluggable TCP framework and other chnages to the
netstack to track for VNET stability.

Security: The FreeBSD Foundation

Fix style issues around existing SDT probes.

- Use SDT_PROBE<N>() instead of SDT_PROBE(). This has no functional effect
at the moment, but will be needed for some future changes.
- Don't hardcode

Fix style issues around existing SDT probes.

- Use SDT_PROBE<N>() instead of SDT_PROBE(). This has no functional effect
at the moment, but will be needed for some future changes.
- Don't hardcode the module component of the probe identifier. This is
set automatically by the SDT framework.

MFC after: 1 week

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Merge from head

Sponsored by: Gandi.net

Merge from head

Merge from head

Sync up with head (up to r288341).

Merge ^/head r287680 through r287877.

dd DTrace probe points, translators and a corresponding script
to provide the TCPDEBUG functionality with pure DTrace.

Reviewed by: rwatson
MFC after: 2 weeks
Sponsored by: Limelight Networks
Differ

dd DTrace probe points, translators and a corresponding script
to provide the TCPDEBUG functionality with pure DTrace.

Reviewed by: rwatson
MFC after: 2 weeks
Sponsored by: Limelight Networks
Differential Revision: D3530

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