translate_compat_table(struct net *net,
		       const char *name,
		       unsigned int valid_hooks,
		       struct xt_table_info **pinfo,
		       void **pentry0,
		       unsigned int total_size,
		       unsigned int number,
		       unsigned int *hook_entries,
		       unsigned int *underflows)
{
	unsigned int i, j;
	struct xt_table_info *newinfo, *info;
	void *pos, *entry0, *entry1;
	struct compat_ipt_entry *iter0;
	struct ipt_entry *iter1;
	unsigned int size;
	int ret;

	info = *pinfo;
	entry0 = *pentry0;
	size = total_size;
	info->number = number;

	/* Init all hooks to impossible value. */
	for (i = 0; i < NF_INET_NUMHOOKS; i++) {
		info->hook_entry[i] = 0xFFFFFFFF;
		info->underflow[i] = 0xFFFFFFFF;
	}

	duprintf("translate_compat_table: size %u\n", info->size);
	j = 0;
	xt_compat_lock(AF_INET);
	xt_compat_init_offsets(AF_INET, number);
	/* Walk through entries, checking offsets. */
	xt_entry_foreach(iter0, entry0, total_size) {
		ret = check_compat_entry_size_and_hooks(iter0, info, &size,
							entry0,
							entry0 + total_size,
							hook_entries,
							underflows,
							name);
		if (ret != 0)
			goto out_unlock;
		++j;
	}

	ret = -EINVAL;
	if (j != number) {
		duprintf("translate_compat_table: %u not %u entries\n",
			 j, number);
		goto out_unlock;
	}

	/* Check hooks all assigned */
	for (i = 0; i < NF_INET_NUMHOOKS; i++) {
		/* Only hooks which are valid */
		if (!(valid_hooks & (1 << i)))
			continue;
		if (info->hook_entry[i] == 0xFFFFFFFF) {
			duprintf("Invalid hook entry %u %u\n",
				 i, hook_entries[i]);
			goto out_unlock;
		}
		if (info->underflow[i] == 0xFFFFFFFF) {
			duprintf("Invalid underflow %u %u\n",
				 i, underflows[i]);
			goto out_unlock;
		}
	}

	ret = -ENOMEM;
	newinfo = xt_alloc_table_info(size);
	if (!newinfo)
		goto out_unlock;

	newinfo->number = number;
	for (i = 0; i < NF_INET_NUMHOOKS; i++) {
		newinfo->hook_entry[i] = info->hook_entry[i];
		newinfo->underflow[i] = info->underflow[i];
	}
	entry1 = newinfo->entries[raw_smp_processor_id()];
	pos = entry1;
	size = total_size;
	xt_entry_foreach(iter0, entry0, total_size) {
		ret = compat_copy_entry_from_user(iter0, &pos, &size,
						  name, newinfo, entry1);
		if (ret != 0)
			break;
	}
	xt_compat_flush_offsets(AF_INET);
	xt_compat_unlock(AF_INET);
	if (ret)
		goto free_newinfo;

	ret = -ELOOP;
	if (!mark_source_chains(newinfo, valid_hooks, entry1))
		goto free_newinfo;

	i = 0;
	xt_entry_foreach(iter1, entry1, newinfo->size) {
		ret = compat_check_entry(iter1, net, name);
		if (ret != 0)
			break;
		++i;
		if (strcmp(ipt_get_target(iter1)->u.user.name,
		    XT_ERROR_TARGET) == 0)
			++newinfo->stacksize;
	}
	if (ret) {
		/*
		 * The first i matches need cleanup_entry (calls ->destroy)
		 * because they had called ->check already. The other j-i
		 * entries need only release.
		 */
		int skip = i;
		j -= i;
		xt_entry_foreach(iter0, entry0, newinfo->size) {
			if (skip-- > 0)
				continue;
			if (j-- == 0)
				break;
			compat_release_entry(iter0);
		}
		xt_entry_foreach(iter1, entry1, newinfo->size) {
			if (i-- == 0)
				break;
			cleanup_entry(iter1, net);
		}
		xt_free_table_info(newinfo);
		return ret;
	}

	/* And one copy for every other CPU */
	for_each_possible_cpu(i)
		if (newinfo->entries[i] && newinfo->entries[i] != entry1)
			memcpy(newinfo->entries[i], entry1, newinfo->size);

	*pinfo = newinfo;
	*pentry0 = entry1;
	xt_free_table_info(info);
	return 0;

free_newinfo:
	xt_free_table_info(newinfo);
out:
	xt_entry_foreach(iter0, entry0, total_size) {
		if (j-- == 0)
			break;
		compat_release_entry(iter0);
	}
	return ret;
out_unlock:
	xt_compat_flush_offsets(AF_INET);
	xt_compat_unlock(AF_INET);
	goto out;
}