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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /* * Copyright (c) 2008-2009 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/module.h> #include <linux/seqlock.h> #include <linux/netlink.h> #include <linux/netfilter.h> #include <linux/netfilter/nf_tables.h> #include <net/netfilter/nf_tables.h> struct nft_counter { seqlock_t lock; u64 bytes; u64 packets; }; static void nft_counter_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { struct nft_counter *priv = nft_expr_priv(expr); write_seqlock_bh(&priv->lock); priv->bytes += pkt->skb->len; priv->packets++; write_sequnlock_bh(&priv->lock); } static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr) { struct nft_counter *priv = nft_expr_priv(expr); unsigned int seq; u64 bytes; u64 packets; do { seq = read_seqbegin(&priv->lock); bytes = priv->bytes; packets = priv->packets; } while (read_seqretry(&priv->lock, seq)); if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(bytes))) goto nla_put_failure; if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(packets))) goto nla_put_failure; return 0; nla_put_failure: return -1; } static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, }; static int nft_counter_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_counter *priv = nft_expr_priv(expr); if (tb[NFTA_COUNTER_PACKETS]) priv->packets = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); if (tb[NFTA_COUNTER_BYTES]) priv->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); seqlock_init(&priv->lock); return 0; } static struct nft_expr_type nft_counter_type; static const struct nft_expr_ops nft_counter_ops = { .type = &nft_counter_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_counter)), .eval = nft_counter_eval, .init = nft_counter_init, .dump = nft_counter_dump, }; static struct nft_expr_type nft_counter_type __read_mostly = { .name = "counter", .ops = &nft_counter_ops, .policy = nft_counter_policy, .maxattr = NFTA_COUNTER_MAX, .flags = NFT_EXPR_STATEFUL, .owner = THIS_MODULE, }; static int __init nft_counter_module_init(void) { return nft_register_expr(&nft_counter_type); } static void __exit nft_counter_module_exit(void) { nft_unregister_expr(&nft_counter_type); } module_init(nft_counter_module_init); module_exit(nft_counter_module_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); MODULE_ALIAS_NFT_EXPR("counter"); |