[Bug 6530] New: `ip ro` advmss option is not supported

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6530

           Summary: `ip ro` advmss option is not supported
           Product: Busybox
           Version: 1.21.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: ojab at ojab.ru
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


>From `man ip`:
>advmss NUMBER (2.3.15+ only)
>              the  MSS  ('Maximal  Segment  Size')  to advertise to these destinations when establishing TCP connections.  If it is not given, Linux uses a default value calculated from the first hop device MTU.  (If the path to these destination is asymmetric, this guess may be wrong.)

But busybox-1.21.1 (and trunk afaiu) doesn't support it:
>$busybox ip ro add default via 1.1.1.1 dev eth1 advmss 8910
>ip: either "to" is duplicate, or "advmss" is garbage

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