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![Patrick McHardy](/assets/img/avatar_default.png)
Split the expression ops into two parts and support overloading of the runtime expression ops based on the requested function through a ->select_ops() callback. This can be used to provide optimized implementations, for instance for loading small aligned amounts of data from the packet or inlining frequently used operations into the main evaluation loop. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
113 lines
2.9 KiB
C
113 lines
2.9 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/seqlock.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_counter {
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seqlock_t lock;
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u64 bytes;
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u64 packets;
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};
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static void nft_counter_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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struct nft_counter *priv = nft_expr_priv(expr);
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write_seqlock_bh(&priv->lock);
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priv->bytes += pkt->skb->len;
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priv->packets++;
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write_sequnlock_bh(&priv->lock);
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}
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static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_counter *priv = nft_expr_priv(expr);
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unsigned int seq;
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u64 bytes;
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u64 packets;
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do {
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seq = read_seqbegin(&priv->lock);
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bytes = priv->bytes;
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packets = priv->packets;
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} while (read_seqretry(&priv->lock, seq));
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if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(bytes)))
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goto nla_put_failure;
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if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(packets)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
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[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
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[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
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};
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static int nft_counter_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_counter *priv = nft_expr_priv(expr);
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if (tb[NFTA_COUNTER_PACKETS])
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priv->packets = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
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if (tb[NFTA_COUNTER_BYTES])
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priv->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
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seqlock_init(&priv->lock);
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return 0;
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}
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static struct nft_expr_type nft_counter_type;
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static const struct nft_expr_ops nft_counter_ops = {
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.type = &nft_counter_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_counter)),
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.eval = nft_counter_eval,
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.init = nft_counter_init,
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.dump = nft_counter_dump,
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};
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static struct nft_expr_type nft_counter_type __read_mostly = {
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.name = "counter",
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.ops = &nft_counter_ops,
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.policy = nft_counter_policy,
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.maxattr = NFTA_COUNTER_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_counter_module_init(void)
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{
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return nft_register_expr(&nft_counter_type);
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}
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static void __exit nft_counter_module_exit(void)
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{
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nft_unregister_expr(&nft_counter_type);
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}
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module_init(nft_counter_module_init);
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module_exit(nft_counter_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_EXPR("counter");
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