[Bug 257057] icmp6 error messages not forwarding to traceroute6

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: bugs@FreeBSD.org
          Reporter: jcaplan@blackberry.com

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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