[Bug 235927] FreeBSD does not reply to ICMP requests when assigned a Class-E address

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235927

            Bug ID: 235927
           Summary: FreeBSD does not reply to ICMP requests when assigned
                    a Class-E address
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: logan at cyberstorm.mu

Created attachment 202244
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202244&action=edit
FreeBSD icmp class-e fix

Due to the shrinkage of the IPv4 space, some people are looking at using
Class-E as a way to further expand the range of usable IPv4 addresses. In order
to make this happen, an audit is needed for FreeBSD to check for 240.0.0.0/4
assignment. When assigning a class-e ip to FreeBSD-12, it works except for
ICMP.

Example, when pinging the FreeBSD machine:
ping 240.0.1.199
PING 240.0.1.199 (240.0.1.199) 56(84) bytes of data.
^C
--- 240.0.1.199 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5088ms

However, SSH is accessible:
nc -v 240.0.1.199 22
Connection to 240.0.1.199 22 port [tcp/ssh] succeeded!
SSH-2.0-OpenSSH_7.8 FreeBSD-20180909

This attached patch removes the check for experimental/class-e range address
and allows ICMP to work.

ping 240.0.1.199
PING 240.0.1.199 (240.0.1.199) 56(84) bytes of data.
64 bytes from 240.0.1.199: icmp_seq=1 ttl=64 time=0.664 ms
64 bytes from 240.0.1.199: icmp_seq=2 ttl=64 time=0.860 ms
64 bytes from 240.0.1.199: icmp_seq=3 ttl=64 time=0.740 ms

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