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Differential D49339

netinet6: Do not forward or send ICMPv6 messages to the unspec address
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Authored by markj on Mar 13 2025, 12:22 AM.
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zlei
glebius
Commits
rG226076aa20f3: netinet6: Do not forward or send ICMPv6 messages to the unspec address
rGb7a61e09e4ad: netinet6: Do not forward or send ICMPv6 messages to the unspec address
Summary

As in f7174eb2b4c4 ("netinet: Do not forward or ICMP response to
INADDR_ANY"), the IPv6 stack should avoid sending packets to the
unspecified address. In particular:

  • Make sure that we do not forward received packets to the unspecified address; the check in ip6_input() catches this in the common case, but after commit 40faf87894ff it's possible for a pfil hook to bypass this check and pass the packet to ip6_forward() using the PACKET_TAG_IPFORWARD tag.
  • Make sure that we do not reflect packets back to the unspecified address; RFC 4443 section 2.4 states that we must not generate error messages in response to packets from the unspecified address.

Reported by: Franco Fichtner <franco@opnsense.org>
Sponsored by: Klara, Inc.
Sponsored by: OPNsense

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rG FreeBSD src repository
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sys/
netinet6/
6 lines
3 lines

Diff 154097

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sys/netinet6/icmp6.c

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sys/netinet6/ip6_forward.c

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