[OpenAFS-devel] Announcement: Significant changes to Rx internals

[Jeffrey Altman]

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I have built this code on Windows and the current daily builds
available at

  /afs/athena.mit.edu/user/j/a/jaltman/Public/OpenAFS/
  http://web.mit.edu/jaltman/Public/OpenAFS/

are built with it on both 32-bit and 64-bit Windows.  As far as I am
aware the code works correctly.  However, additional testing is required.

Jeffrey Altman


Ken Hornstein wrote:
> Some background:
> 
> Many of you know that I have been working on adding a TCP transport for Rx.
> That work has been progressing (not as fast as I would like, but forward
> progress is being made).
> 
> I have reached a point where limitations in the internals of Rx had
> become too limiting in my TCP work.  Specifically, hosts were
> respresented internally as pairs of unsigned 32-bit integers (one for
> the host, one for the remote port number).  This left no room for
> specifying a socket type (such as a TCP socket, forcing me to implement
> a number of hacks to work around that), or a larger address such as
> IPv6 addresses.
> 
> After discussions with Derrick Brashear, I have committed code to the
> HEAD of the OpenAFS CVS tree to address these deficiencies.  These include
> the following changes:
> 
> - The rx_peer structure "host" and "port" elements have been replaced by
>   the following members:
> 
>   struct sockaddr_storage saddr;
>   int saddrlen;
>   int socktype;
> 
> - All of the internal Rx functions (there is no good definition of what
>   constitutes "internal" Rx functions - I took my best guess) have been
>   changed to pass a pointer to struct sockaddr_storage and the address
>   length instead of host & port.
> 
> - Additional APIs have been added to allow a programmer to specify different
>   addresses/socket types.  The original APIs have been retained for
>   compatibility.  The complete functionality of these new APIs has not
>   yet been implemented, but that should come in the future.  I was
>   planning on giving a more complete presentation on these changes
>   at the AFS Best Practices Workshop.
> 
> I have tested a fileserver and client with these changes; they both
> work.  There is additional work to be done.  Specifically, the
> interfaces inside of the os-specific kernel network routines need to be
> changed to support the new arguments for osi_NetSend() and
> osi_NetReceive() (I couldn't do them all since I didn't have access to
> them).  These changes should be relatively straightforward; if you are
> interested in working on the code for a platform that has not yet been
> fixed, let me know if you need help.  Look at src/rx/DARWIN/rx_knet.c
> for an example of an already-fixed platform.
> 
> We have not yet put in compatbility for operating systems that lack the
> sockaddr_storage structure.  I don't know how many hosts we still care
> about that lack this structure.  The ways for dealing with this are
> fairly well understood; I just wanted a test system that we could
> utilize before I started guessing at a fix.
> 
> Code that depends on accessing peer->host will obviously fail.  If code
> uses rx_HostOf(), it will do the right thing.
> 
> During this work I tried to be careful about supporting IPv6.  I
> believe that Rx is now 70-80% IPv6 "ready".  HOWEVER ... this comes
> with a significant caveat, and people should READ THIS CAREFULLY.
> While I think there is only a small amount of work that is required to
> make Rx work with IPv6, this does not hold true for AFS in general.  A
> LOT of work would be necessary to make AFS support IPv6 properly; there
> are a large number of IPv4 assumptions in AFS right now.  This is an
> important first step, but it's only a _first_ step.
> 
> Comments are welcome,
> 
> --Ken
> _______________________________________________
> OpenAFS-devel mailing list
> OpenAFS-devel@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-devel

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