Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3 | * |
| 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. |
| 7 | * |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
| 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> |
| 19 | |
| 20 | struct nft_counter { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 21 | u64 bytes; |
| 22 | u64 packets; |
| 23 | }; |
| 24 | |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 25 | struct nft_counter_percpu { |
| 26 | struct nft_counter counter; |
| 27 | struct u64_stats_sync syncp; |
| 28 | }; |
| 29 | |
| 30 | struct nft_counter_percpu_priv { |
| 31 | struct nft_counter_percpu __percpu *counter; |
| 32 | }; |
| 33 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 34 | static void nft_counter_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 35 | struct nft_regs *regs, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 36 | const struct nft_pktinfo *pkt) |
| 37 | { |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 38 | struct nft_counter_percpu_priv *priv = nft_expr_priv(expr); |
| 39 | struct nft_counter_percpu *this_cpu; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 40 | |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 41 | local_bh_disable(); |
| 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); |
| 47 | local_bh_enable(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 48 | } |
| 49 | |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 50 | static void nft_counter_fetch(const struct nft_counter_percpu __percpu *counter, |
| 51 | struct nft_counter *total) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 52 | { |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 53 | const struct nft_counter_percpu *cpu_stats; |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 54 | u64 bytes, packets; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 55 | unsigned int seq; |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 56 | int cpu; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 57 | |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 58 | memset(total, 0, sizeof(*total)); |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 59 | for_each_possible_cpu(cpu) { |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 60 | cpu_stats = per_cpu_ptr(counter, cpu); |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 61 | do { |
| 62 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); |
| 63 | bytes = cpu_stats->counter.bytes; |
| 64 | packets = cpu_stats->counter.packets; |
| 65 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 66 | |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 67 | total->packets += packets; |
| 68 | total->bytes += bytes; |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 69 | } |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 73 | { |
| 74 | struct nft_counter_percpu_priv *priv = nft_expr_priv(expr); |
| 75 | struct nft_counter total; |
| 76 | |
| 77 | nft_counter_fetch(priv->counter, &total); |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 78 | |
Nicolas Dichtel | b46f6de | 2016-04-22 17:31:18 +0200 | [diff] [blame] | 79 | if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), |
| 80 | NFTA_COUNTER_PAD) || |
| 81 | nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets), |
| 82 | NFTA_COUNTER_PAD)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 83 | goto nla_put_failure; |
| 84 | return 0; |
| 85 | |
| 86 | nla_put_failure: |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
| 91 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, |
| 92 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, |
| 93 | }; |
| 94 | |
| 95 | static int nft_counter_init(const struct nft_ctx *ctx, |
| 96 | const struct nft_expr *expr, |
| 97 | const struct nlattr * const tb[]) |
| 98 | { |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 99 | struct nft_counter_percpu_priv *priv = nft_expr_priv(expr); |
| 100 | struct nft_counter_percpu __percpu *cpu_stats; |
| 101 | struct nft_counter_percpu *this_cpu; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 102 | |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 103 | cpu_stats = netdev_alloc_pcpu_stats(struct nft_counter_percpu); |
| 104 | if (cpu_stats == NULL) |
Anton Protopopov | 5cc6ce9 | 2016-02-06 23:31:19 -0500 | [diff] [blame] | 105 | return -ENOMEM; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 106 | |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 107 | preempt_disable(); |
| 108 | this_cpu = this_cpu_ptr(cpu_stats); |
| 109 | if (tb[NFTA_COUNTER_PACKETS]) { |
| 110 | this_cpu->counter.packets = |
| 111 | be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); |
| 112 | } |
| 113 | if (tb[NFTA_COUNTER_BYTES]) { |
| 114 | this_cpu->counter.bytes = |
| 115 | be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); |
| 116 | } |
| 117 | preempt_enable(); |
| 118 | priv->counter = cpu_stats; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 119 | return 0; |
| 120 | } |
| 121 | |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 122 | static void nft_counter_destroy(const struct nft_ctx *ctx, |
| 123 | const struct nft_expr *expr) |
| 124 | { |
| 125 | struct nft_counter_percpu_priv *priv = nft_expr_priv(expr); |
| 126 | |
| 127 | free_percpu(priv->counter); |
| 128 | } |
| 129 | |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 130 | static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src) |
| 131 | { |
| 132 | struct nft_counter_percpu_priv *priv = nft_expr_priv(src); |
| 133 | struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst); |
| 134 | struct nft_counter_percpu __percpu *cpu_stats; |
| 135 | struct nft_counter_percpu *this_cpu; |
| 136 | struct nft_counter total; |
| 137 | |
| 138 | nft_counter_fetch(priv->counter, &total); |
| 139 | |
| 140 | cpu_stats = __netdev_alloc_pcpu_stats(struct nft_counter_percpu, |
| 141 | GFP_ATOMIC); |
| 142 | if (cpu_stats == NULL) |
Anton Protopopov | 5cc6ce9 | 2016-02-06 23:31:19 -0500 | [diff] [blame] | 143 | return -ENOMEM; |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 144 | |
| 145 | preempt_disable(); |
| 146 | this_cpu = this_cpu_ptr(cpu_stats); |
| 147 | this_cpu->counter.packets = total.packets; |
| 148 | this_cpu->counter.bytes = total.bytes; |
| 149 | preempt_enable(); |
| 150 | |
| 151 | priv_clone->counter = cpu_stats; |
| 152 | return 0; |
| 153 | } |
| 154 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 155 | static struct nft_expr_type nft_counter_type; |
| 156 | static const struct nft_expr_ops nft_counter_ops = { |
| 157 | .type = &nft_counter_type, |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 158 | .size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)), |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 159 | .eval = nft_counter_eval, |
| 160 | .init = nft_counter_init, |
Pablo Neira Ayuso | 0c45e76 | 2015-06-08 14:42:40 +0200 | [diff] [blame] | 161 | .destroy = nft_counter_destroy, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 162 | .dump = nft_counter_dump, |
Pablo Neira Ayuso | 086f332 | 2015-11-10 13:39:42 +0100 | [diff] [blame] | 163 | .clone = nft_counter_clone, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 164 | }; |
| 165 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 166 | static struct nft_expr_type nft_counter_type __read_mostly = { |
| 167 | .name = "counter", |
| 168 | .ops = &nft_counter_ops, |
| 169 | .policy = nft_counter_policy, |
| 170 | .maxattr = NFTA_COUNTER_MAX, |
Patrick McHardy | 151d799 | 2015-04-11 10:46:40 +0100 | [diff] [blame] | 171 | .flags = NFT_EXPR_STATEFUL, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 172 | .owner = THIS_MODULE, |
| 173 | }; |
| 174 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 175 | static int __init nft_counter_module_init(void) |
| 176 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 177 | return nft_register_expr(&nft_counter_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | static void __exit nft_counter_module_exit(void) |
| 181 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 182 | nft_unregister_expr(&nft_counter_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | module_init(nft_counter_module_init); |
| 186 | module_exit(nft_counter_module_exit); |
| 187 | |
| 188 | MODULE_LICENSE("GPL"); |
| 189 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 190 | MODULE_ALIAS_NFT_EXPR("counter"); |