// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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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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s64 bytes;
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s64 packets;
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};
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struct nft_counter_percpu_priv {
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struct nft_counter __percpu *counter;
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};
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static DEFINE_PER_CPU(seqcount_t, nft_counter_seq);
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static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_counter *this_cpu;
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seqcount_t *myseq;
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local_bh_disable();
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this_cpu = this_cpu_ptr(priv->counter);
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myseq = this_cpu_ptr(&nft_counter_seq);
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write_seqcount_begin(myseq);
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this_cpu->bytes += pkt->skb->len;
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this_cpu->packets++;
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write_seqcount_end(myseq);
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local_bh_enable();
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}
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static inline void nft_counter_obj_eval(struct nft_object *obj,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
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nft_counter_do_eval(priv, regs, pkt);
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}
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static int nft_counter_do_init(const struct nlattr * const tb[],
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struct nft_counter_percpu_priv *priv)
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{
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struct nft_counter __percpu *cpu_stats;
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struct nft_counter *this_cpu;
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cpu_stats = alloc_percpu(struct nft_counter);
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if (cpu_stats == NULL)
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return -ENOMEM;
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preempt_disable();
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this_cpu = this_cpu_ptr(cpu_stats);
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if (tb[NFTA_COUNTER_PACKETS]) {
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this_cpu->packets =
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be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
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}
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if (tb[NFTA_COUNTER_BYTES]) {
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this_cpu->bytes =
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be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
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}
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preempt_enable();
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priv->counter = cpu_stats;
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return 0;
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}
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static int nft_counter_obj_init(const struct nft_ctx *ctx,
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const struct nlattr * const tb[],
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struct nft_object *obj)
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{
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struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
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return nft_counter_do_init(tb, priv);
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}
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static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
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{
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free_percpu(priv->counter);
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}
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static void nft_counter_obj_destroy(const struct nft_ctx *ctx,
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struct nft_object *obj)
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{
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struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
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nft_counter_do_destroy(priv);
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}
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static void nft_counter_reset(struct nft_counter_percpu_priv *priv,
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struct nft_counter *total)
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{
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struct nft_counter *this_cpu;
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local_bh_disable();
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this_cpu = this_cpu_ptr(priv->counter);
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this_cpu->packets -= total->packets;
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this_cpu->bytes -= total->bytes;
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local_bh_enable();
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}
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static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
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struct nft_counter *total)
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{
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struct nft_counter *this_cpu;
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const seqcount_t *myseq;
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u64 bytes, packets;
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unsigned int seq;
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int cpu;
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memset(total, 0, sizeof(*total));
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for_each_possible_cpu(cpu) {
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myseq = per_cpu_ptr(&nft_counter_seq, cpu);
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this_cpu = per_cpu_ptr(priv->counter, cpu);
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do {
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seq = read_seqcount_begin(myseq);
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bytes = this_cpu->bytes;
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packets = this_cpu->packets;
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} while (read_seqcount_retry(myseq, seq));
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total->bytes += bytes;
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total->packets += packets;
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}
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}
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static int nft_counter_do_dump(struct sk_buff *skb,
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struct nft_counter_percpu_priv *priv,
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bool reset)
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{
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struct nft_counter total;
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nft_counter_fetch(priv, &total);
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if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
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NFTA_COUNTER_PAD) ||
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nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
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NFTA_COUNTER_PAD))
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goto nla_put_failure;
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if (reset)
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nft_counter_reset(priv, &total);
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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 int nft_counter_obj_dump(struct sk_buff *skb,
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struct nft_object *obj, bool reset)
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{
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struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
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return nft_counter_do_dump(skb, priv, reset);
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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 struct nft_object_type nft_counter_obj_type;
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static const struct nft_object_ops nft_counter_obj_ops = {
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.type = &nft_counter_obj_type,
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.size = sizeof(struct nft_counter_percpu_priv),
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.eval = nft_counter_obj_eval,
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.init = nft_counter_obj_init,
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.destroy = nft_counter_obj_destroy,
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.dump = nft_counter_obj_dump,
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};
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static struct nft_object_type nft_counter_obj_type __read_mostly = {
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.type = NFT_OBJECT_COUNTER,
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.ops = &nft_counter_obj_ops,
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.maxattr = NFTA_COUNTER_MAX,
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.policy = nft_counter_policy,
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.owner = THIS_MODULE,
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};
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static void nft_counter_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
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nft_counter_do_eval(priv, regs, pkt);
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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_percpu_priv *priv = nft_expr_priv(expr);
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return nft_counter_do_dump(skb, priv, false);
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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_percpu_priv *priv = nft_expr_priv(expr);
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return nft_counter_do_init(tb, priv);
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}
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static void nft_counter_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
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nft_counter_do_destroy(priv);
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}
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static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
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{
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struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
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struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
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struct nft_counter __percpu *cpu_stats;
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struct nft_counter *this_cpu;
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struct nft_counter total;
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nft_counter_fetch(priv, &total);
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cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
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if (cpu_stats == NULL)
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return -ENOMEM;
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preempt_disable();
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this_cpu = this_cpu_ptr(cpu_stats);
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this_cpu->packets = total.packets;
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this_cpu->bytes = total.bytes;
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preempt_enable();
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priv_clone->counter = cpu_stats;
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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_percpu_priv)),
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.eval = nft_counter_eval,
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.init = nft_counter_init,
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.destroy = nft_counter_destroy,
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.destroy_clone = nft_counter_destroy,
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.dump = nft_counter_dump,
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.clone = nft_counter_clone,
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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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.flags = NFT_EXPR_STATEFUL,
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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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int cpu, err;
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for_each_possible_cpu(cpu)
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seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));
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err = nft_register_obj(&nft_counter_obj_type);
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if (err < 0)
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return err;
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err = nft_register_expr(&nft_counter_type);
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if (err < 0)
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goto err1;
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return 0;
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err1:
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nft_unregister_obj(&nft_counter_obj_type);
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return err;
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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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nft_unregister_obj(&nft_counter_obj_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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MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
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MODULE_DESCRIPTION("nftables counter rule support");
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