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Differential D54942

netinet6: Remove support for connecting to IN6ADDR_ANY
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Authored by emaste on Jan 29 2026, 2:35 PM.
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imp
melifaro

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bz
glebius
pouria
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rGa1789fa30c0b: netinet6: Remove support for connecting to IN6ADDR_ANY
Summary

RFC4291 section 2.5.2:

The unspecified address must not be used as the destination address
of IPv6 packets or in IPv6 Routing headers.  An IPv6 packet with a
source address of unspecified must never be forwarded by an IPv6
router.

We disallowed connections to IN6ADDR_ANY by default, as of commit 627e126dbb07b167b028380ef61bb45f10493938. As this is actually disallowed by the RFC, just remove support.

Reported by: bz (in D54306)

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rG FreeBSD src repository
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Event Timeline

emaste created this revision.Jan 29 2026, 2:35 PM
Herald added subscribers: melifaro, ae. · View Herald TranscriptJan 29 2026, 2:35 PM
emaste requested review of this revision.Jan 29 2026, 2:35 PM
bz accepted this revision.Jan 29 2026, 2:40 PM

Seems fine to me. Do we have a test case for this (which may need to be adjusted)?

This revision is now accepted and ready to land.Jan 29 2026, 2:40 PM
glebius accepted this revision.Jan 29 2026, 4:52 PM
glebius added inline comments.
sys/netinet6/in6_pcb.c
391–392

Let's add comment /* RFC4291 section 2.5.2 */ right above this line.

Closed by commit rGa1789fa30c0b: netinet6: Remove support for connecting to IN6ADDR_ANY (authored by emaste). · Explain WhyMar 5 2026, 7:58 PM
This revision was automatically updated to reflect the committed changes.
emaste added a commit: rGa1789fa30c0b: netinet6: Remove support for connecting to IN6ADDR_ANY.
Herald added a reviewer: pouria. · View Herald TranscriptMar 5 2026, 7:58 PM
Herald added a subscriber: imp. · View Herald Transcript

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sys/
netinet6/
19 lines

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sys/netinet6/in6_pcb.c

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