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Differential D55367

icmp6: Remove csum_flags on mbuf reused for ICMP message
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Authored by timo.voelker_fh-muenster.de on Feb 19 2026, 12:15 PM.

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Reviewers

glebius
tuexen
kp
melifaro
zlei

Commits

rGea75f726c432: icmp6: clear csum_flags on mbuf reuse
rG28b5b653a567: icmp6: clear csum_flags on mbuf reuse
rG0a87ae18331d: icmp6: clear csum_flags on mbuf reuse
rGada4dc77577f: icmp6: clear csum_flags on mbuf reuse

Summary

When icmp6 sends an ICMPv6 message, it reuses the mbuf of the packet that triggered the ICMPv6 message and prepends an IP and ICMPv6 header. For a locally generated packet with checksum offloading, the mbuf still has csum_flags set indicating that a SCTP/TCP/UDP checksum has to be computed and inserted. Since this not the case anymore, csum_flags need to be removed.

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rG FreeBSD src repository

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Event Timeline

timo.voelker_fh-muenster.de created this revision.Feb 19 2026, 12:15 PM

Herald added subscribers: ae, imp. · View Herald TranscriptFeb 19 2026, 12:15 PM

Solves this bug:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293227

(Not tested, but that just seems sensible.)

This revision is now accepted and ready to land.Feb 19 2026, 12:47 PM

tuexen accepted this revision.Feb 19 2026, 1:05 PM

Looks good to me.

Closed by commit rGada4dc77577f: icmp6: clear csum_flags on mbuf reuse (authored by timo.voelker_fh-muenster.de, committed by tuexen). · Explain WhyFeb 19 2026, 2:21 PM

This revision was automatically updated to reflect the committed changes.

tuexen added a commit: rGada4dc77577f: icmp6: clear csum_flags on mbuf reuse.

tuexen added a commit: rG0a87ae18331d: icmp6: clear csum_flags on mbuf reuse.Feb 19 2026, 6:58 PM

cperciva added a commit: rG28b5b653a567: icmp6: clear csum_flags on mbuf reuse.Feb 19 2026, 7:28 PM

tuexen added a commit: rGea75f726c432: icmp6: clear csum_flags on mbuf reuse.Sun, Feb 22, 9:48 AM

Revision Contents
Changeset List

Path

Size

sys/

netinet6/

1 line

Diff 172231

sys/netinet6/icmp6.c

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