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