Hello,
I am writing a kernel module which deals with security.
I am able to catch packets correctly. I want to compare the value of
destination address in the ip header agains a specified ip, where the
specified ip
is in the form : "192.168.0.103".
The destination address I am talking about is fron the ip header of the
frame; to be more specific, I am talking about an instance of iphdr struct
from include/linux/ip.h.
This struct has the following member:
__be32 daddr;
- which is the destination ip address. (32 bits).
The specified ip I am talking about is : 192.168.0.103
Now, how should I comapare the value of daddr (which is __be32) in my module
to that specified ip : "192.168.0.103"?
I tried the following:
...
struct iphdr *iph;
iph = skb->nh.iph;
if (iph)
{
if (htonl(0xC0A80067) == daddr)
printk("got daddr=192.168.0.103\n");
else
printk("did not get daddr=192.168.0.103\n");
}
And I get **wrong** answer , namely it prints: "did not get daddr" , even
though I know for sure that the daddr of the ip header is 192.168.0.103.
I think that the hex representation for
192.168.0.103 is 0xC0A80067; am I right in this ? (I caclulated this thus:
C0=192, A8=168, 00=0, 67=103).
But maybe the order of the bytes should be different ? something like:
if (htonl(0x6700A8C0) == daddr)
printk("got daddr=192.168.0.103\n");
Or is there another way I should do this ?
Any help will be appreciated!
(I want to add that I am working on x86_64 machine with Intel processor.)
Regards,
Ian
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