[Bug 255507] traceroute6 generates wrong UDP checksum

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255507

            Bug ID: 255507
           Summary: traceroute6 generates wrong UDP checksum
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: zlei.huang at gmail.com

Environment: FreeBSD stable/13 host A and FreeBSD host B, connected via router.

This can be reproduced.
Steps to repeat:
1. traceroute6 -nq1 IP6_address_on_host_B
2. On host B, netstat -sp udp | grep 'bad checksum', it shows increasing
statistic counter. It can be verified by tcpdump -npvi nic 'ip6 && udp' .


Note:
* If host A is directly connected with host B, then the UDP checksum is
correct.
* Some system other then FreeBSD seems not checking UDP checksum before
generating ICMP time exceeded, thus to repeat it host B should be FreeBSD
system.

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