OK. That makes sense for what I'm seeing.
What I have is the following struct:
struct ipt_CSUM_info {
u_int32_t address;
u_int8_t addressCount;
u_int16_t port;
u_int8_t portCount;
u_int8_t interval;
u_int8_t maxFailures;
};
and I register the following target in lib*.c:
static struct iptables_target CSUM = {
.next = NULL,
.name = "CSUM",
.version = NETFILTER_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_CSUM_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_CSUM_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&CSUM);
}
Then I try and register the target in the kernel C file which is where
it seems to fail:
static struct ipt_target ipt_CSUM = {
.name = "CSUM",
.target = ipt_csum_target,
.checkentry = ipt_csum_checkentry,
};
static int __init init(void)
{
ipt_char_major = register_chrdev(0,"ipt_CSUM_char",&char_fops);
init_timer(&csum_timer);
csum_timer.function = timer_callback;
init_waitqueue_head(&inqMSG);
printk("register target\n");
return ipt_register_target(&ipt_CSUM);
}
On Mon, Jul 14, 2008 at 4:07 PM, Jan Engelhardt <jengelh@xxxxxxxxxx> wrote:
>
> On Monday 2008-07-14 21:26, Kevin Sookocheff wrote:
>
>>Hi everyone,
>>
>>I am having a problem developing an IPTables module.
>>
>>I get the following error (CSUM is the name of my module):
>>
>>ip_tables: CSUM target: invalid size 0 != 12
>>
>>The first question is why this error appears,
>
> Because your xt_CSUM.c file and libxt_CSUM.c do not agree on
> the private structure (size).
>
>>and why does it only appear for SMP kernels?
>
> Perhaps you only have a specific change in an SMP kernel?
> Or maybe because your private structure contains bad members.
> Nobody knows until code is seen.
>
> Read more about the process in
> http://jengelh.medozas.de/documents/Netfilter_Modules.pdf
>
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