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Differential D43243

libdtrace: decode all tcp header flags
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Authored by rscheff on Dec 30 2023, 10:06 AM.

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Details

Reviewers

markj
tuexen
mav
gnn

Commits

rG38c63bdc4625: libdtrace: decode all tcp header flags and add

Summary

add decoding capability of TH_AE to dtrace, including
the example provided with tcpdebug.

Diff Detail

Repository

rG FreeBSD src repository

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Unit

No Test Coverage

Build Status

Buildable 55177
Build 52066: arc lint + arc unit

Event Timeline

rscheff created this revision.Dec 30 2023, 10:06 AM

Herald added a reviewer: gnn. · View Herald TranscriptDec 30 2023, 10:06 AM

Herald added a subscriber: imp. · View Herald Transcript

rscheff requested review of this revision.Dec 30 2023, 10:06 AM

Harbormaster completed remote builds in B55162: Diff 132007.Dec 30 2023, 10:06 AM

tuexen added inline comments.Dec 30 2023, 10:17 AM

cddl/lib/libdtrace/tcp.d
99	I'm pretty sure that `1.6.3` is wrong here, but I don't know what the right number is. I guess markj@ knows...
322	I guess `TA_OUTPUT` should be `TA_DROP`?

fix TA_DROP

Harbormaster completed remote builds in B55163: Diff 132008.Dec 30 2023, 10:24 AM

rscheff marked an inline comment as done.Dec 30 2023, 10:25 AM

tuexen added inline comments.Dec 30 2023, 12:54 PM

cddl/lib/libdtrace/tcp.d
99	According to dt_open.c the current version is `1.13`. Not sure if we need to bump it, since you change `tcpinfo_t` later down. I'll let that up to markj@.
324–325	You need to bump the version to `1.13` at least.

markj added inline comments.Dec 30 2023, 4:11 PM

cddl/lib/libdtrace/tcp.d
99	I think it's ok to update the type without changing the version. D scripts won't be sensitive to such changes.
269	Where is get_tcp_flags() implemented?

bump version number of the modified string bindings

cddl/lib/libdtrace/tcp.d
269	tcp.h (in context _BSD_VISIBLE). May be renamed to __tcp_tcp_flags() for userspace though subsequently.

Harbormaster completed remote builds in B55166: Diff 132016.Dec 30 2023, 5:58 PM

rscheff marked an inline comment as done.Dec 30 2023, 5:59 PM

Not very my area, but seems to have sense.

This revision is now accepted and ready to land.Dec 30 2023, 9:05 PM

markj added inline comments.Dec 31 2023, 4:06 PM

cddl/lib/libdtrace/tcp.d
269	But how does dtrace know about tcp.h? And how can it compile and run C functions? I do not think this can work. dtrace can parse C to get some types of definitions, but that is fairly limited. You'll need to implement `tcp_get_flags` as an inline, I think, similar to how `tcp_state_string` works.

retain inline access to flag fields

This revision now requires review to proceed.Dec 31 2023, 5:09 PM

Harbormaster completed remote builds in B55177: Diff 132043.Dec 31 2023, 5:09 PM

rscheff marked an inline comment as done.Dec 31 2023, 5:09 PM

markj added inline comments.Dec 31 2023, 5:16 PM

cddl/lib/libdtrace/tcp.d
269
288

markj added inline comments.Dec 31 2023, 6:01 PM

cddl/lib/libdtrace/tcp.d
90

rscheff marked 3 inline comments as done.Dec 31 2023, 8:39 PM

rscheff added inline comments.

cddl/lib/libdtrace/tcp.d
90	oh, unintended edit. thx.
248	Is this " `hz " correct here? A single backtick feels strange in the middle of C-like code...

fix typo and bracketing

Harbormaster completed remote builds in B55181: Diff 132048.Dec 31 2023, 8:40 PM

markj accepted this revision.Dec 31 2023, 8:43 PM

markj added inline comments.

cddl/lib/libdtrace/tcp.d
248	Yes. It's syntax which allows D scripts to refer to the kernel's global variables.

This revision is now accepted and ready to land.Dec 31 2023, 8:43 PM

Closed by commit rG38c63bdc4625: libdtrace: decode all tcp header flags and add (authored by rscheff). · Explain WhyDec 31 2023, 9:04 PM

This revision was automatically updated to reflect the committed changes.

rscheff added a commit: rG38c63bdc4625: libdtrace: decode all tcp header flags and add.

Revision Contents
Changeset List

Path

Size

cddl/

lib/

libdtrace/

35 lines

share/

dtrace/

9 lines

Diff 132043

cddl/lib/libdtrace/tcp.d

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share/dtrace/tcpdebug

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