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/*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
struct nft_meta {
enum nft_meta_keys key;
};
static void nft_meta_eval(const struct nft_expr *expr,
struct nft_data *nfres,
struct nft_data *data,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *meta = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
u32 val = data->data[0];
switch (meta->key) {
case NFT_META_MARK:
skb->mark = val;
break;
case NFT_META_PRIORITY:
skb->priority = val;
break;
case NFT_META_NFTRACE:
skb->nf_trace = val;
break;
#ifdef CONFIG_NETWORK_SECMARK
case NFT_META_SECMARK:
skb->secmark = val;
break;
#endif
default:
WARN_ON(1);
}
}
static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
[NFTA_META_KEY] = { .type = NLA_U32 },
};
static int nft_meta_init(const struct nft_expr *expr, struct nlattr *tb[])
{
struct nft_meta *meta = nft_expr_priv(expr);
if (tb[NFTA_META_KEY] == NULL)
return -EINVAL;
meta->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
switch (meta->key) {
case NFT_META_MARK:
case NFT_META_PRIORITY:
case NFT_META_NFTRACE:
#ifdef CONFIG_NETWORK_SECMARK
case NFT_META_SECMARK:
#endif
break;
default:
return -EINVAL;
}
return 0;
}
static int nft_meta_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
struct nft_meta *meta = nft_expr_priv(expr);
NLA_PUT_BE32(skb, NFTA_META_KEY, htonl(meta->key));
return 0;
nla_put_failure:
return -1;
}
static struct nft_expr_ops meta_target __read_mostly = {
.name = "meta",
.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
.owner = THIS_MODULE,
.eval = nft_meta_eval,
.init = nft_meta_init,
.dump = nft_meta_dump,
.policy = nft_meta_policy,
.maxattr = NFTA_META_MAX,
};
static int __init nft_meta_target_init(void)
{
return nft_register_expr(&meta_target);
}
static void __exit nft_meta_target_exit(void)
{
nft_unregister_expr(&meta_target);
}
module_init(nft_meta_target_init);
module_exit(nft_meta_target_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("meta");
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