Hello!,
Is it possible to work with "expect" from a netfilter hook (not from a conntrack helper)?
When I run the code below, I get:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP [] nf_ct_expect_related_report+0x63/0x427
*pde = 3df8d067
Oops: 000 [#1] SMP
------
int np_exp(struct nf_conn *ct){
struct nf_conntrack_expect *exp;
struct nf_conntrack_tuple *tuple;
exp = nf_ct_expect_alloc(ct);
if(exp == NULL){
printk("Couldn't allocate exp!\n");
return -1;
}
tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), &tuple->src.u3, &tuple->dst.u3, IPPROTO_TCP, NULL, &tuple->dst.u.tcp.port);
nf_ct_expect_put(exp);
return 1;
}
hook_func(...){
if(!(conntrack = nf_ct_get(sock_buff, &ctinfo)) || !(master_conntrack = nf_ct_get(skb, &master_ctinfo))){
spin_unlock_bh(&np_lock);
return NF_ACCEPT; /* Couldn't get conntrack */
}
np_exp(conntrack);
}
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