ip_conntrack_event_cache_init(*pskb);
static unsigned int ip_conntrack_help(unsigned int hooknum,				      struct sk_buff **pskb,				      const struct net_device *in,				      const struct net_device *out,				      int (*okfn)(struct sk_buff *)){	struct ip_conntrack *ct;	enum ip_conntrack_info ctinfo;	/* This is where we call the helper: as the packet goes out. */	ct = ip_conntrack_get(*pskb, &ctinfo);	if (ct && ct->helper) {		unsigned int ret;		ip_conntrack_event_cache_init(*pskb);		ret = ct->helper->help(pskb, ct, ctinfo);		if (ret != NF_ACCEPT)			return ret;	}	return NF_ACCEPT;}