232 lines
5.4 KiB
C
232 lines
5.4 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/jhash.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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struct nft_hash {
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struct hlist_head *hash;
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unsigned int hsize;
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};
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struct nft_hash_elem {
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struct hlist_node hnode;
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struct nft_data key;
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struct nft_data data[];
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};
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static u32 nft_hash_rnd __read_mostly;
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static bool nft_hash_rnd_initted __read_mostly;
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static unsigned int nft_hash_data(const struct nft_data *data,
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unsigned int hsize, unsigned int len)
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{
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unsigned int h;
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h = jhash(data->data, len, nft_hash_rnd);
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return ((u64)h * hsize) >> 32;
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}
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static bool nft_hash_lookup(const struct nft_set *set,
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const struct nft_data *key,
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struct nft_data *data)
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{
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const struct nft_hash *priv = nft_set_priv(set);
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const struct nft_hash_elem *he;
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unsigned int h;
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h = nft_hash_data(key, priv->hsize, set->klen);
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hlist_for_each_entry(he, &priv->hash[h], hnode) {
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if (nft_data_cmp(&he->key, key, set->klen))
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continue;
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if (set->flags & NFT_SET_MAP)
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nft_data_copy(data, he->data);
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return true;
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}
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return false;
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}
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static void nft_hash_elem_destroy(const struct nft_set *set,
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struct nft_hash_elem *he)
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{
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nft_data_uninit(&he->key, NFT_DATA_VALUE);
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if (set->flags & NFT_SET_MAP)
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nft_data_uninit(he->data, set->dtype);
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kfree(he);
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}
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static int nft_hash_insert(const struct nft_set *set,
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const struct nft_set_elem *elem)
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{
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struct nft_hash *priv = nft_set_priv(set);
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struct nft_hash_elem *he;
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unsigned int size, h;
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if (elem->flags != 0)
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return -EINVAL;
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size = sizeof(*he);
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if (set->flags & NFT_SET_MAP)
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size += sizeof(he->data[0]);
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he = kzalloc(size, GFP_KERNEL);
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if (he == NULL)
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return -ENOMEM;
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nft_data_copy(&he->key, &elem->key);
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if (set->flags & NFT_SET_MAP)
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nft_data_copy(he->data, &elem->data);
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h = nft_hash_data(&he->key, priv->hsize, set->klen);
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hlist_add_head_rcu(&he->hnode, &priv->hash[h]);
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return 0;
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}
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static void nft_hash_remove(const struct nft_set *set,
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const struct nft_set_elem *elem)
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{
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struct nft_hash_elem *he = elem->cookie;
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hlist_del_rcu(&he->hnode);
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kfree(he);
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}
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static int nft_hash_get(const struct nft_set *set, struct nft_set_elem *elem)
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{
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const struct nft_hash *priv = nft_set_priv(set);
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struct nft_hash_elem *he;
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unsigned int h;
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h = nft_hash_data(&elem->key, priv->hsize, set->klen);
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hlist_for_each_entry(he, &priv->hash[h], hnode) {
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if (nft_data_cmp(&he->key, &elem->key, set->klen))
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continue;
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elem->cookie = he;
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elem->flags = 0;
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if (set->flags & NFT_SET_MAP)
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nft_data_copy(&elem->data, he->data);
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return 0;
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}
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return -ENOENT;
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}
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static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set,
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struct nft_set_iter *iter)
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{
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const struct nft_hash *priv = nft_set_priv(set);
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const struct nft_hash_elem *he;
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struct nft_set_elem elem;
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unsigned int i;
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for (i = 0; i < priv->hsize; i++) {
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hlist_for_each_entry(he, &priv->hash[i], hnode) {
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if (iter->count < iter->skip)
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goto cont;
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memcpy(&elem.key, &he->key, sizeof(elem.key));
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if (set->flags & NFT_SET_MAP)
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memcpy(&elem.data, he->data, sizeof(elem.data));
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elem.flags = 0;
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iter->err = iter->fn(ctx, set, iter, &elem);
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if (iter->err < 0)
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return;
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cont:
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iter->count++;
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}
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}
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}
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static unsigned int nft_hash_privsize(const struct nlattr * const nla[])
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{
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return sizeof(struct nft_hash);
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}
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static int nft_hash_init(const struct nft_set *set,
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const struct nlattr * const tb[])
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{
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struct nft_hash *priv = nft_set_priv(set);
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unsigned int cnt, i;
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if (unlikely(!nft_hash_rnd_initted)) {
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get_random_bytes(&nft_hash_rnd, 4);
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nft_hash_rnd_initted = true;
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}
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/* Aim for a load factor of 0.75 */
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// FIXME: temporarily broken until we have set descriptions
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cnt = 100;
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cnt = cnt * 4 / 3;
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priv->hash = kcalloc(cnt, sizeof(struct hlist_head), GFP_KERNEL);
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if (priv->hash == NULL)
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return -ENOMEM;
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priv->hsize = cnt;
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for (i = 0; i < cnt; i++)
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INIT_HLIST_HEAD(&priv->hash[i]);
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return 0;
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}
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static void nft_hash_destroy(const struct nft_set *set)
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{
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const struct nft_hash *priv = nft_set_priv(set);
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const struct hlist_node *next;
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struct nft_hash_elem *elem;
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unsigned int i;
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for (i = 0; i < priv->hsize; i++) {
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hlist_for_each_entry_safe(elem, next, &priv->hash[i], hnode) {
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hlist_del(&elem->hnode);
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nft_hash_elem_destroy(set, elem);
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}
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}
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kfree(priv->hash);
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}
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static struct nft_set_ops nft_hash_ops __read_mostly = {
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.privsize = nft_hash_privsize,
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.init = nft_hash_init,
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.destroy = nft_hash_destroy,
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.get = nft_hash_get,
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.insert = nft_hash_insert,
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.remove = nft_hash_remove,
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.lookup = nft_hash_lookup,
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.walk = nft_hash_walk,
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.features = NFT_SET_MAP,
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.owner = THIS_MODULE,
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};
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static int __init nft_hash_module_init(void)
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{
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return nft_register_set(&nft_hash_ops);
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}
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static void __exit nft_hash_module_exit(void)
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{
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nft_unregister_set(&nft_hash_ops);
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}
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module_init(nft_hash_module_init);
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module_exit(nft_hash_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_SET();
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