Thanks for all of the comments. I understand why my experimental code seemed to work properly. My code read the previously set data of skb, not the data of just arrived packet. I checked the behavior by printk, but I couldn't realized that's not valid data. Actually, I got kernel panic several times. I think it was due to such invalid reading of skb. Thanks for your valuable comments. Naoya Maruyama > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl.linux.org] On Behalf Of Zeeshan Ali > Sent: Friday, April 16, 2004 6:02 AM > To: kernelnewbies@nl.linux.org > Subject: Re: reading skb at interrupt handler > > Hello, > > > If i remember correctly, net_rx_action sets > > skb->nh.raw, atleast that's > > how it old 2.4 used to work. Before netif_rx, the > > skb->nh pointer is for > > sure not initialized, > > No doubt, as not knowing about this, my code used > to read the src/dest IPs from skb->nh in the > eth->rx_hook and get the kernel into panic. I finally > solved the problem by taking the iphdr from the > skb->data. Keep in mind that I am talking about 2.4. > > BTW, should'nt we initialize the non-itialized > poiters to NULL? hmm.. but maybe it's a bad suggestion > in the context of the kernel alteast. > > ===== > --------------------------------------------------------- > "To teach how to live without certainty, and yet without > being paralysed by hesitation, is perhaps the chief thing > that philosophy, in our age, can still do for those who study > it." --Bertrand Russell > > "According to all the rules (of Software Engineering) I knew, > Linux should have been a disaster, but it was'nt. Instead it > was something wonderfull" -- Eric Raymond > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Tax Center - File online by April 15th > http://taxes.yahoo.com/filing.html > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
