ipt_do_table(struct sk_buff **pskb,
	     unsigned int hook,
	     const struct net_device *in,
	     const struct net_device *out,
	     struct ipt_table *table)
{
	static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
	u_int16_t offset;
	struct iphdr *ip;
	u_int16_t datalen;
	int hotdrop = 0;
	/* Initializing verdict to NF_DROP keeps gcc happy. */
	unsigned int verdict = NF_DROP;
	const char *indev, *outdev;
	void *table_base;
	struct ipt_entry *e, *back;
	struct xt_table_info *private;

	/* Initialization */
	ip = (*pskb)->nh.iph;
	datalen = (*pskb)->len - ip->ihl * 4;
	indev = in ? in->name : nulldevname;
	outdev = out ? out->name : nulldevname;
	/* We handle fragments by dealing with the first fragment as
	 * if it was a normal packet.  All other fragments are treated
	 * normally, except that they will NEVER match rules that ask
	 * things we don't know, ie. tcp syn flag or ports).  If the
	 * rule is also a fragment-specific rule, non-fragments won't
	 * match it. */
	offset = ntohs(ip->frag_off) & IP_OFFSET;

	read_lock_bh(&table->lock);
	IP_NF_ASSERT(table->valid_hooks & (1 << hook));
	private = table->private;
	table_base = (void *)private->entries[smp_processor_id()];
	e = get_entry(table_base, private->hook_entry[hook]);

	/* For return from builtin chain */
	back = get_entry(table_base, private->underflow[hook]);

	do {
		IP_NF_ASSERT(e);
		IP_NF_ASSERT(back);
		if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
			struct ipt_entry_target *t;

			if (IPT_MATCH_ITERATE(e, do_match,
					      *pskb, in, out,
					      offset, &hotdrop) != 0)
				goto no_match;

			ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);

			t = ipt_get_target(e);
			IP_NF_ASSERT(t->u.kernel.target);
			/* Standard target? */
			if (!t->u.kernel.target->target) {
				int v;

				v = ((struct ipt_standard_target *)t)->verdict;
				if (v < 0) {
					/* Pop from stack? */
					if (v != IPT_RETURN) {
						verdict = (unsigned)(-v) - 1;
						break;
					}
					e = back;
					back = get_entry(table_base,
							 back->comefrom);
					continue;
				}
				if (table_base + v != (void *)e + e->next_offset
				    && !(e->ip.flags & IPT_F_GOTO)) {
					/* Save old back ptr in next entry */
					struct ipt_entry *next
						= (void *)e + e->next_offset;
					next->comefrom
						= (void *)back - table_base;
					/* set back pointer to next entry */
					back = next;
				}

				e = get_entry(table_base, v);
			} else {
				/* Targets which reenter must return
                                   abs. verdicts */
#ifdef CONFIG_NETFILTER_DEBUG
				((struct ipt_entry *)table_base)->comefrom
					= 0xeeeeeeec;
#endif
				verdict = t->u.kernel.target->target(pskb,
								     in, out,
								     hook,
								     t->u.kernel.target,
								     t->data);

#ifdef CONFIG_NETFILTER_DEBUG
				if (((struct ipt_entry *)table_base)->comefrom
				    != 0xeeeeeeec
				    && verdict == IPT_CONTINUE) {
					printk("Target %s reentered!\n",
					       t->u.kernel.target->name);
					verdict = NF_DROP;
				}
				((struct ipt_entry *)table_base)->comefrom
					= 0x57acc001;
#endif
				/* Target might have changed stuff. */
				ip = (*pskb)->nh.iph;
				datalen = (*pskb)->len - ip->ihl * 4;

				if (verdict == IPT_CONTINUE)
					e = (void *)e + e->next_offset;
				else
					/* Verdict */
					break;
			}
		} else {

		no_match:
			e = (void *)e + e->next_offset;
		}
	} while (!hotdrop);

	read_unlock_bh(&table->lock);

#ifdef DEBUG_ALLOW_ALL
	return NF_ACCEPT;
#else
	if (hotdrop)
		return NF_DROP;
	else return verdict;
#endif
}
ipt_do_table(struct sk_buff **pskb,
	     unsigned int hook,
	     const struct net_device *in,
	     const struct net_device *out,
	     struct ipt_table *table)
{
	static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
	u_int16_t offset;
	struct iphdr *ip;
	u_int16_t datalen;
	int hotdrop = 0;
	 
	unsigned int verdict = NF_DROP;
	const char *indev, *outdev;
	void *table_base;
	struct ipt_entry *e, *back;
	struct xt_table_info *private;

	 
	ip = (*pskb)->nh.iph;
	datalen = (*pskb)->len - ip->ihl * 4;
	indev = in ? in->name : nulldevname;
	outdev = out ? out->name : nulldevname;
	 
	offset = ntohs(ip->frag_off) & IP_OFFSET;

	read_lock_bh(&table->lock);
	IP_NF_ASSERT(table->valid_hooks & (1 << hook));
	private = table->private;
	table_base = (void *)private->entries[smp_processor_id()];
	e = get_entry(table_base, private->hook_entry[hook]);

	 
	back = get_entry(table_base, private->underflow[hook]);

	do {
		IP_NF_ASSERT(e);
		IP_NF_ASSERT(back);
		if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
			struct ipt_entry_target *t;

			if (IPT_MATCH_ITERATE(e, do_match,
					      *pskb, in, out,
					      offset, &hotdrop) != 0)
				goto no_match;

			ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);

			t = ipt_get_target(e);
			IP_NF_ASSERT(t->u.kernel.target);
			 
			if (!t->u.kernel.target->target) {
				int v;

				v = ((struct ipt_standard_target *)t)->verdict;
				if (v < 0) {
					 
					if (v != IPT_RETURN) {
						verdict = (unsigned)(-v) - 1;
						break;
					}
					e = back;
					back = get_entry(table_base,
							 back->comefrom);
					continue;
				}
				if (table_base + v != (void *)e + e->next_offset
				    && !(e->ip.flags & IPT_F_GOTO)) {
					 
					struct ipt_entry *next
						= (void *)e + e->next_offset;
					next->comefrom
						= (void *)back - table_base;
					 
					back = next;
				}

				e = get_entry(table_base, v);
			} else {
				 
#ifdef CONFIG_NETFILTER_DEBUG
				((struct ipt_entry *)table_base)->comefrom
					= 0xeeeeeeec;
#endif
				verdict = t->u.kernel.target->target(pskb,
								     in, out,
								     hook,
								     t->u.kernel.target,
								     t->data);

#ifdef CONFIG_NETFILTER_DEBUG
				if (((struct ipt_entry *)table_base)->comefrom
				    != 0xeeeeeeec
				    && verdict == IPT_CONTINUE) {
					printk("Target %s reentered!\n",
					       t->u.kernel.target->name);
					verdict = NF_DROP;
				}
				((struct ipt_entry *)table_base)->comefrom
					= 0x57acc001;
#endif
				 
				ip = (*pskb)->nh.iph;
				datalen = (*pskb)->len - ip->ihl * 4;

				if (verdict == IPT_CONTINUE)
					e = (void *)e + e->next_offset;
				else
					 
					break;
			}
		} else {

		no_match:
			e = (void *)e + e->next_offset;
		}
	} while (!hotdrop);

	read_unlock_bh(&table->lock);

#ifdef DEBUG_ALLOW_ALL
	return NF_ACCEPT;
#else
	if (hotdrop)
		return NF_DROP;
	else return verdict;
#endif
}