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108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
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/*
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* Copyright (c) 2008 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_ops nft_counter_ops __read_mostly = {
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.name = "counter",
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.size = NFT_EXPR_SIZE(sizeof(struct nft_counter)),
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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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.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 int __init nft_counter_module_init(void)
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{
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return nft_register_expr(&nft_counter_ops);
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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_ops);
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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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