2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/seqlock.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_tables.h>
25 struct nft_counter_percpu {
26 struct nft_counter counter;
27 struct u64_stats_sync syncp;
30 struct nft_counter_percpu_priv {
31 struct nft_counter_percpu __percpu *counter;
34 static void nft_counter_eval(const struct nft_expr *expr,
35 struct nft_regs *regs,
36 const struct nft_pktinfo *pkt)
38 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
39 struct nft_counter_percpu *this_cpu;
42 this_cpu = this_cpu_ptr(priv->counter);
43 u64_stats_update_begin(&this_cpu->syncp);
44 this_cpu->counter.bytes += pkt->skb->len;
45 this_cpu->counter.packets++;
46 u64_stats_update_end(&this_cpu->syncp);
50 static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
52 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
53 struct nft_counter_percpu *cpu_stats;
54 struct nft_counter total;
59 memset(&total, 0, sizeof(total));
60 for_each_possible_cpu(cpu) {
61 cpu_stats = per_cpu_ptr(priv->counter, cpu);
63 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
64 bytes = cpu_stats->counter.bytes;
65 packets = cpu_stats->counter.packets;
66 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
68 total.packets += packets;
72 if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)) ||
73 nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets)))
81 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
82 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
83 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
86 static int nft_counter_init(const struct nft_ctx *ctx,
87 const struct nft_expr *expr,
88 const struct nlattr * const tb[])
90 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
91 struct nft_counter_percpu __percpu *cpu_stats;
92 struct nft_counter_percpu *this_cpu;
94 cpu_stats = netdev_alloc_pcpu_stats(struct nft_counter_percpu);
95 if (cpu_stats == NULL)
99 this_cpu = this_cpu_ptr(cpu_stats);
100 if (tb[NFTA_COUNTER_PACKETS]) {
101 this_cpu->counter.packets =
102 be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
104 if (tb[NFTA_COUNTER_BYTES]) {
105 this_cpu->counter.bytes =
106 be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
109 priv->counter = cpu_stats;
113 static void nft_counter_destroy(const struct nft_ctx *ctx,
114 const struct nft_expr *expr)
116 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
118 free_percpu(priv->counter);
121 static struct nft_expr_type nft_counter_type;
122 static const struct nft_expr_ops nft_counter_ops = {
123 .type = &nft_counter_type,
124 .size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
125 .eval = nft_counter_eval,
126 .init = nft_counter_init,
127 .destroy = nft_counter_destroy,
128 .dump = nft_counter_dump,
131 static struct nft_expr_type nft_counter_type __read_mostly = {
133 .ops = &nft_counter_ops,
134 .policy = nft_counter_policy,
135 .maxattr = NFTA_COUNTER_MAX,
136 .flags = NFT_EXPR_STATEFUL,
137 .owner = THIS_MODULE,
140 static int __init nft_counter_module_init(void)
142 return nft_register_expr(&nft_counter_type);
145 static void __exit nft_counter_module_exit(void)
147 nft_unregister_expr(&nft_counter_type);
150 module_init(nft_counter_module_init);
151 module_exit(nft_counter_module_exit);
153 MODULE_LICENSE("GPL");
154 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
155 MODULE_ALIAS_NFT_EXPR("counter");