I found the error in my code.
I have been trying to print out some of the information in the kernel
just to see if I understand correctly but without much luck so far.
So in sys_socketcall() function, when the user calls, for example,
getsockname(), then I want to print out IP address. So here is what I
did.
case SYS_GETSOCKNAME:
err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int
__user *)a[2]);
{
#define ILHO_IP_NUMS(x) (x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, (x)>>24
struct sockaddr *name = (struct sockaddr __user*)a1;
struct in_addr ip = ((struct sockaddr_in *)&name)->sin_addr;
Printk("GETSOCKNAME - %d.%d.%d.%d\n", ILHO_IP_NUMS(ip.s_addr));
}
break;
However, I did not get the value in the way I expected so I was just
wondering if I have to do anything here. Please kindly give me some
advice. Thank you.
I realized that I did not use the struct sockaddr_in. After I used it,
things were sorted out clearly. Sorry for the spams. Here is the
changed code.
case SYS_GETSOCKNAME:
err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int
__user *)a[2]);
{
#define ILHO_IP_NUMS(x) (x)&0xff, ((x)>>8)&0xff, ((x)>>16)&0xff, (x)>>24
struct sockaddr_in *name = (struct sockaddr __user*)a1;
struct in_addr ip = name->sin_addr;
Printk("GETSOCKNAME - %d.%d.%d.%d\n", ILHO_IP_NUMS(ip.s_addr));
}
break;
Thanks.
Ilho <><
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