Re: IP layer bug?

Oleg Drokin
2001-03-26T06:13:11Z

Hello!

On Mon, Mar 26, 2001 at 04:06:19PM +0530, Manoj Sontakke wrote:
> > 2.4.x kernel. have not tried 2.2
> > I just found somethig, I believe is kernel bug.
> > I am working with usbnet.c driver, which stores some of its
> > internal state in sk_buff.cb area. But once such skb passed to
> > upper layer with netif_rx, net/ipv4/ip_input.c reuses content of cb
> > (line #345),
> ip_options_compile() when called with first argument NULL resets cb to 0.
I have found that already.

> This is probably because the cb is supposed to be used IP and above. The
Sure.

> underlying layer(link and phy) could be anything so where from the
> ip_options should start will depend upon the underlying layer.
But here's the problem!
If I won't zero cb in my driver before netif_rx() call,
IP layer thinks that all my packets have various ip options set
(source routing most notable)

Bye,
Oleg