Bingo ! You were right. I figured that out last night after hours and hours of kernel recompiles and reboots !! :) It now works. Thanks to all ciao, Amit On Tue, 26 Jun 2001, yal wrote: > Hi, > You should add new Ethernet type in your packet and define handle that > process it. And this will be enough. > > Yordan. > > > On Monday 25 June 2001 21:42, Amit Kucheria wrote: > > Hi Akshay, > > > > Thanks for your reply. > > > > I am looking at the ip_build_xmit() code, but i have a feeling that this > > is not my problem. The 16 bytes is the length of 'myheader' and is not > > something related to a multiple of 16 bytes. > > > > My packets travel from one machine to another but they dont go up the > > protocol stack on the destination machine. > > Following is the output of tcpdump at the destination machine for ping > > traffic that i am sending (ping data set to 0xff). > > > > -------------------------------------------------------------------- > > 14:29:05.003856 eth0 < truncated-ip - 157 bytes missing!10.5.1.2 > > > 69.0.0.84: (frag 2573:217@2056) [tos 0x5] (ttl 3, bad cksum 0!, > > optlen=20[|ip]) > > > > 1. 0a05 0101 0a0d 0101 0300 0000 0a05 0102 > > 2. 4500 0054 0378 0000 4001 611e 0a0d 0101 > > 3. 0a05 0101 0800 4b8a 5a02 3600 0191 373b > > 4. e3a6 0000 ffff ffff ffff ffff ffff ffff > > 5. ffff ffff ffff ffff ffff ffff ffff ffff > > 6. ffff ffff ffff ffff ffff ffff ffff ffff > > 7. ffff ffff > > ------------------------------------------------------------------- > > > > As can be seen from tcpdump's interpretation, the src is 10.5.1.2 and > > destination is 69.0.0.84. That means the IP src and destination are being > > taken from the last 4 bytes of line 1 (0a05 0102) and first 4 bytes of > > line 2 (4500 0054). This in turn means that the first line is taken to be > > the IP header when in fact it is "myheader". > > > > The real IP header begins from line 2 (4500 0054). > > > > I tried setting skb->nh.iph to that point (line 2) but it doesnt seem to > > work ! That is when i noticed that skb->nh.raw and skb->h.raw are set to > > skb->data in net_bh(). So essentially mac.raw, nh.raw and h.raw are all > > pointing to the ethernet header when the packet reaches net_bh() on the > > destination machine. > > > > I dont exactly know where my reasoning is going wrong. > > > > Regards, > > Amit - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
