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pf: Fix unaligned checksum updates
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Authored by kp on Dec 21 2020, 9:09 AM.
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ae
afedorov
farrokhi
imp
melifaro
tuexen

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tuexen
Group Reviewers
network
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rG21745738a2b5: pf: Fix unaligned checksum updates
Summary

The algorithm we use to update checksums only works correctly if the
updated data is aligned on 16-bit boundaries (relative to the start of
the packet).

Import the OpenBSD fix for this issue.

PR: 240416
Obtained from: OpenBSD

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Lint Passed
Unit
No Test Coverage
Build Status
Buildable 35583
Build 32483: arc lint + arc unit

Event Timeline

kp created this revision.Dec 21 2020, 9:09 AM
Herald added subscribers: melifaro, farrokhi, ae, imp. · View Herald TranscriptDec 21 2020, 9:09 AM
kp requested review of this revision.Dec 21 2020, 9:09 AM
Harbormaster completed remote builds in B35568: Diff 80997.Dec 21 2020, 9:09 AM
tuexen added a subscriber: tuexen.Dec 21 2020, 10:30 AM

I guess you need a similar dance (for 16-bit) in pf_normalize_tcpopt() when updating the MSS.

kp updated this revision to Diff 81014.Dec 21 2020, 9:13 PM

Also handle the MSS update case.

Harbormaster completed remote builds in B35583: Diff 81014.Dec 21 2020, 9:13 PM
tuexen accepted this revision.Dec 21 2020, 11:11 PM
This revision is now accepted and ready to land.Dec 21 2020, 11:11 PM
kp updated this revision to Diff 81047.Dec 22 2020, 12:00 PM

Ensure we actually update the packet, even when checksum flags indicate the checksum doesn't need an update.

This revision now requires review to proceed.Dec 22 2020, 12:00 PM
Harbormaster completed remote builds in B35607: Diff 81047.Dec 22 2020, 12:00 PM
tuexen accepted this revision.Dec 22 2020, 12:18 PM
This revision is now accepted and ready to land.Dec 22 2020, 12:18 PM
afedorov added a subscriber: afedorov.Dec 22 2020, 2:10 PM
kp closed this revision.Dec 23 2020, 12:05 PM

Committed as https://cgit.freebsd.org/src/commit/?id=c3f69af03ae7acc167cc1151f0c1ecc5e014ce4e

kp added a commit: rG21745738a2b5: pf: Fix unaligned checksum updates.Jan 3 2021, 10:19 PM

Revision Contents
Changeset List

PathSize
sys/
net/
6 lines
netpfil/
pf/
82 lines
23 lines

Diff 81014

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sys/net/pfvar.h

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sys/netpfil/pf/pf.c

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sys/netpfil/pf/pf_norm.c

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