https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257057
Bug ID: 257057
Summary: icmp6 error messages not forwarding to traceroute6
Product: Base System
Version: 13.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 226304
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=226304&action=edit
proposed patch
Overview
--------
traceroute6 expects to receive ICMP6_TIME_EXCEEDED from the network stack, but
icmp6_rip6_input() does not let them through
Steps to Reproduce
------------------
Setup with 3 targets
DUT1 DUT2 DUT3
3001::1:11 -> 3001::1:12 -> 2001::1:12 -> 2001::1:13
DUT2 has forwarding enabled:
net.inet6.ip6.forwarding: 1 -> 0
and on DUT1:
traceroute6 -n -I 2001::1:13
Actual Results
--------------
# traceroute6 -I dut3
raceroute6 to dut3 (2001::1:13) from 3001::1:11, 64 hops max, 20 byte packets
1 * * *
2 dut3 0.000 ms 0.000 ms 1.000 ms
Expected Results
----------------
# traceroute6 -I dut3
traceroute6 to dut3 (2001::1:13) from 3001::1:11, 64 hops max, 20 byte packets
1 dut2 0.000 ms 1.000 ms 1.000 ms
2 dut3 2.000 ms 1.000 ms 2.000 ms
Build Date & Hardware
---------------------
FreeBSD freebsd 13.0-RELEASE FreeBSD 13.0-RELEASE #6
releng/13.0-n244733-ea31abc261f: Sat Jun 19 06:23:53 UTC 2021
Additional Information
----------------------
icmp6_rip6_input() should only check if the packet destination address is
correct. attaching proposed patch.
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