Hi guys, i'm writing a netfilter module which must
enqueue packets in different queues and reinject each
one of them according to my decisions... but i have
some doubts....
module--------------------------------------
unsigned int hook_func_11(unsigned int hooknum,
struct sk_buff **skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
if (strcmp(in->name, interface_LAN) == 0)
{ return NF_ACCEPT; }
if (strcmp(in->name, interface_WAN) == 0)
{ return NF_ACCEPT; }
if (strcmp(in->name, interface_loopback) == 0)
{ return NF_QUEUE; }
else
{ return NF_DROP; }
}
unsigned int hook_func_41(unsigned int hooknum,
struct sk_buff **skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
return NF_ACCEPT;
}
int init_module(void)
{
hook_1.hook = hook_func_11;
hook_1.hooknum = NF_IP_PRE_ROUTING;
hook_1.pf = PF_INET;
hook_1.priority = NF_IP_PRI_FIRST;
hook_4.hook = hook_func_41;
hook_4.hooknum = NF_IP_POST_ROUTING;
hook_4.pf = PF_INET;
hook_4.priority = NF_IP_PRI_FIRST;
nf_register_hook(&hook_1);
nf_register_hook(&hook_4);
return 0;
}
void cleanup_module(void)
{
nf_unregister_hook(&hook_1);
nf_unregister_hook(&hook_4);
}
---------------------------------------------
I've registered two hooks (NF_IP_PRE_ROUTING and
NF_IP_POST_ROUTING), but one of them enqueue some
packets (return NF_QUEUE)..... I know at this point,
all queued packets are dropped!, because no-one is
registered to handle queued packets...... and for
register interest in queued packets i must use
nf_register_queue_handler() and
nf_unregister_queue_handler()...
In "Processing queued packets - Netfilter hacking
howto" you wrote: you must register interest
in queued packets and then they begin queueing. Can
you please explain me how do i do that? what happens
with packets when they're queued? where are they
stored?
I've seen nf_register_queue_handler declarated in
netfilter.h, but i haven't seen it defined nowhere...
please, how must i register some queue_handlers in my
module (one per protocol)? Thanks for help!!!
Raul Rodriguez
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