hi Michia,
so i have to implement a new protocol in between ICMP and IP protocol. so for that i have to implement a function that takes control from ICMP and gives to IP layer. but still dont you feel that there should be problem again of space. Because how does it knoes total space to be alloacted for packet with new protocol layer.
regards,
parag.
On Thu, 13 May 2004 Micha Feigin wrote :
>On Thu, May 13, 2004 at 07:21:25AM -0000, bunty wrote:
> >
> > hi,
> > i acually increase icmp header length but when i build kernel i
> > am getting iph hook: happy cracking which is because of ip packet
> > header is not completely add to skb so its iphdr's len became short
> > for that i want to know where should i change the space allocated for
> > packet i change the same sock_alloc_send_skb length by the value i
> > want it should be increased?
> >
>
>I'm afraid I don't know the answer to that. Some googling seems to show
>that icmp is part of IP so you may have to enlarge the size of the IP
>header to allow for the extra data or maybe play with the value of
>skb->nh.iph.
>
>You should look at the specs first to see if they allow that though.
>
>I think the right (although maybe not the easiest) method is to add
>another protocol layer either at the level of tcp/ip (level 4 i think)
>or above them, depending on where you want the data.
>
>Try having a look for example at:
>http://www.freesoft.org/CIE/Course/Section3/7.htm
>http://www.onlamp.com/pub/a/bsd/2001/04/04/FreeBSD_Basics.html
>http://www.freesoft.org/CIE/Course/Section3/index.htm
>
>
> > regards,
> > parag.
> >
> >
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