Hi Jukka,
On Tue, Dec 09, 2014 at 04:05:49PM +0200, Jukka Rissanen wrote:
> Hi Alex,
>
> On ti, 2014-12-09 at 12:52 +0100, Alexander Aring wrote:
> > Hi Jukka,
> >
> > On Tue, Dec 09, 2014 at 01:28:16PM +0200, Jukka Rissanen wrote:
> > > Hi Alex,
> > >
> > > the module unloading caused some issues in the receiving end.
> > >
> > > I tried this:
> > > * setup bluetooth 6lowpan connection
> > > * transfer some UDP data
> > > * unload the nhc_rfc6282_udp module (in one peer only, the other still
> > > had udp nhc module loaded)
> > > * try to send more data
> > >
> > > This caused kernel crash in peer that had udp module unloaded:
> > >
> > >
> >
> > mhh, okay. I don't know why this happens also the log gave me not much
> > information, but thanks anyway.
> >
> > Maybe this is a global issue with bluetooth 6LoWPAN error handling.
> >
> > Can you simple do something like this:
> >
> > diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
> > index 32ffec6..2228dce 100644
> > --- a/net/6lowpan/iphc.c
> > +++ b/net/6lowpan/iphc.c
> > @@ -425,6 +425,8 @@ lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev,
> > return -EINVAL;
> > }
> >
> > + return -EINVAL;
> > +
> > /* UDP data uncompression */
> > if (iphc0 & LOWPAN_IPHC_NH_C) {
> > struct udphdr uh;
> >
> >
> > based on current bluetooth-next/master without the NHC framework.
> >
> > This should be working, maybe you never hit any error while calling
> > lowpan_header_decompress function. It's simple testing the error
> > handling not more.
>
> Hmm, I get the same crash here also without this patchset. So something
> goes wrong if <0 code is returned.
>
Okay, do you already working on it?
> >
> > Do this please on one node, the other node should send some 6LoWPAN IPHC
> > packets to check if the error handling working there.
> >
> >
> >
> >
> >
> > Another issue is that I see that skb->dev isn't set before calling
> > lowpan_header_decompress. Because inside your log is a "NULL":
> >
> > (NULL net_device): received unknown nhc id which was not found.
> >
> > Can you change that? That skb->dev is set to before calling
> > lowpan_header_decompress.
>
> I am setting the skb->dev after the call to lowpan_header_decompress().
> And anyway the skb->dev is only used when printing the err.
> Actually should we replace the skb->dev in lowpan_header_decompress()
> with plain dev as that is given to the function as a parameter.
>
Ok, how we introduce this now? You wanna add this do the patch series for
fixing the above issue, or should I add it to my patch series for
introduce nhc framework?
- Alex
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