Re: [PATCH 6/8] SUNRPC: Add kernel build option to disable server-side use of rpcbind v3/v4

["J. Bruce Fields" <bfields@fieldses.org>]

On Mon, Jun 30, 2008 at 06:46:09PM -0400, Chuck Lever wrote:
> Allow distributions to use the legacy behavior until they integrate an
> appropriate user-space rpcbind daemon that can support IPv6 RPC services.
> 
> I tried adding some logic to fall back if (un)registering with a v4
> protocol request failed, but there are too many corner cases.  So I just
> made it a compile-time switch that distributions can throw when they've
> replaced portmapper with rpcbind.

OK, I see you answered my last question....  Hm.  What were the corner
cases?

--b.


> 
> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
> ---
> 
>  fs/Kconfig |   22 ++++++++++++++++++++++
>  1 files changed, 22 insertions(+), 0 deletions(-)
> 
> 
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 8cf8ee2..6148f4c 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -1799,6 +1799,28 @@ config SUNRPC_XPRT_RDMA
>  
>  	  If unsure, say N.
>  
> +config SUNRPC_REGISTER_V4
> +	bool "Register local RPC services via rpcbind v4 (EXPERIMENTAL)"
> +	depends on SUNRPC && EXPERIMENTAL
> +	default n
> +	help 
> +	  Sun added support for registering RPC services at an IPv6
> +	  address by creating two new versions of the rpcbind protocol
> +	  (RFC 1833).
> +
> +	  This option enables support in the kernel RPC server for
> +	  registering kernel RPC services via version 4 of the rpcbind
> +	  protocol.  If you enable this option, you must run a portmapper
> +	  daemon that supports rpcbind protocol version 4.
> +
> +	  Serving NFS over IPv6 from knfsd (the kernel's NFS server)
> +	  requires that you enable this option and use a portmapper that
> +	  supports rpcbind version 4.
> +
> +	  If unsure, say N to get traditional behavior (register kernel
> +	  RPC services using only rpcbind version 2).  Distributions
> +	  using the legacy Linux portmapper daemon must say N here.
> +
>  config RPCSEC_GSS_KRB5
>  	tristate "Secure RPC: Kerberos V mechanism (EXPERIMENTAL)"
>  	depends on SUNRPC && EXPERIMENTAL
> 
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