Re: [Fwd: Re: upcall sample patch]

[Steve French <smfltc@us.ibm.com>]

Steve French wrote:
> For the CIFS Kerberos/SPNEGO case the Kerberos ticket can end up 
> almost 64K in size and need to be passed down by Samba userspace 
> helpers to kernel (for sending over the kernel socket to the server in 
> the data area of the smb that the kernel cifs code formats).
>
> Is the limit on the Linux kernel connector really 1K for passing down 
> to kernel?
>
> On Wed, 2006-12-06 at 17:55 -0600, Steve French wrote:
>   
> > simo wrote:
> >     
> > > Steve,
> > > I am experimenting using netlink.
> > >
> > > I could v. easily send messages from user space to the kernel module,
> > > adapting the provided examples. I am finding some difficulty in
> > > understanding how the other way around is supposed to work though.
> > >
> > > However while digging into headers, I found that currently the maximum
> > > message size is set to 1024 bytes. That's a bit annoying.
> > >
> > >
> > >       
> > Linux kernel connector is the preferred netlink wrapper and it has
> > sample programs that I found.
> > Not sure the maximum size
> >     
>
> Steve I looked into the sample programs in 2.6.19, cn_test.c and ucon.c
> are provided. Unfortunately it is not clear from them how to make
> upcalls. It is very easy to make downcalls, but I found it hard to find
> out what's the right way to catch messages sent from the kernel in the
> user space. Do you have nay other examples?
>
> For the limit, just look in linux/connector.h there you can find a
> define that sets the MAX LEN of the message to 1024.
>
> Simo.
>   
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