[Bug 223036] nfsdumpstate client IP address broken for 64bit arches plus IPv6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223036

            Bug ID: 223036
           Summary: nfsdumpstate client IP address broken for 64bit arches
                    plus IPv6
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rmacklem at FreeBSD.org

Created attachment 187202
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187202&action=edit
Fix nfsdumpstate client IP addr for IPv4 on 64bit and NFSv4.1

nfsdumpstate does not report the client IP address for the clientID.

This can occur when:
- The server is a 64bit architecture. This was caused by the code erroneously
  assuming that a "u_long" was a uint32_t and would exactly store an IPv4
  host address.
  --> The attached patch fixes this.
- The server didn't fill in the field for NFSv4.1 clients.
  --> The attached patch fixes this.
- The client is using IPv6. This was not handled by the original NFSv4 code
  since the original RFC-3530 did not specify a way to define a IPv6 client
  callback address.
  --> I think that RFC-7530 addresses this and it needs to be fixed, but I
      don't have a patch yet.

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