I did the TinyOS 6lowpan stack (blip) a couple years ago and the version in
there implements draft-ietf-6lowpan-hc-06; we were able to interop with
Contiki implementation of the same but I imagine the world has moved
forward since then...
Steve
On Wed, Feb 19, 2014 at 1:22 AM, Alexander Aring <alex.ar...@gmail.com>wrote:
> On Wed, Feb 19, 2014 at 02:46:15PM +0530, Varka Bhadram wrote:
> > Hai Alex,
> >
> >
> > On February 17, 2014 at 11:15 PM Alexander Aring <alex.ar...@gmail.com>
> wrote:
> > > Hi,
> > >
> > > okay I will try to answer all question in this mail.
> > >
> > > On Mon, Feb 17, 2014 at 04:32:48PM +0530, Varka Bhadram wrote:
> > > > This is the packet i received from TinyOS node :
> > > >
> > > > 41 c8 00 22 00 ff ff c6 0f 7c 50 45 6d 12 00 6b 3b 00 40 e0 3a 02 85
> 00 12
> > > > be 00
> > > > 00 00 00 01 02 c6 0f 7c 50 45 6d 12 00 00 00 00 00 00 00 16 ec
> > > >
> > > > I put some debug messges in the kernel the results are as follows:
> > > >
> > > > [ 65.724839] Bhadra : ieee802154_rx_irqsafe
> > > > [ 65.724890] Bhadra : mac802154_subif_rx
> > > > [ 65.724948] Bhadra : lowpan_recv
> > > > [ 65.724964] Bhadra : lowpan_process_data
> > > > [ 65.724995] Bhadra : lowpan_give_skb_to_devices
> > > > [ 65.725010] pkt->type : 00, pkt->protocol: dd86
> > > > [ 65.725028] Bhadra : lowpan_give_skb_to_devices : netif_rx
> > > >
> > > >
> > > > those are the function names in the kernel. With the protocol and
> packet
> > > > type ,
> > > > the skb is handed over to the netif_rx() in lowpan_give_skb_to
> devices()
> > > > function , but it is not reaching to ip6_input_finish() function.
> > > >
> > > > What can be the problem. ? I am working on 3.12 kernel.
> > > >
> > > What I can see from your trace is that you calling
> > > "lowpan_give_skb_to_devices" right after "lowpan_process_data".
> > >
> > > This can have only one reason. Your TinyOS don't make any IPv6
> > > compression, because your IPv6 packet fits into one PDU. (Then we have
> > > the special dispatch value of LOWPAN_DISPATCH_IPV6).
> > >
> > > You get in this branch [1]. And I saw (yes, I already noticed that)
> there
> > > is something wrong with the memory management.
> > >
> > > We make a "kfree_skb(local_skb);" in this branch and not in the others,
> > > but this can't be working. Please try to following patch (which should
> > > included in my rework of fragmentation patches):
> > >
> > > diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
> > > index ff41b4d..383f0a4 100644
> > > --- a/net/ieee802154/6lowpan.c
> > > +++ b/net/ieee802154/6lowpan.c
> > > @@ -1332,7 +1332,6 @@ static int lowpan_rcv(struct sk_buff *skb, struct
> > > net_device *dev,
> > >
> > > lowpan_give_skb_to_devices(local_skb);
> > >
> > > - kfree_skb(local_skb);
> > > kfree_skb(skb);
> > > } else {
> > > switch (skb->data[0] & 0xe0) {
> > >
> > > I think local_skb is freed a little bit too early, and then you
> transmit some
> > > garbage to
> > > ipv6. Please reply if it works or not for you.
> >
> > this is not working properly... Sometimes it is not reaching to IP layer
> > sometimes its working.
> >
> > I am not able understand the problem.. Where is the problem...
> >
> Can you instrument some code with pr_debug for the dispatch value and
> and send the trace with #define DEBUG?
>
> - Alex
>
>
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--
stephen dawson-haggerty
http://cs.berkeley.edu/~stevedh
uc berkeley wireless and embedded systems lab
berkeley, ca 94720
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