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Commit | Line | Data |
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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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, | |
a55e22e9 | 27 | struct nft_regs *regs, |
96518518 PM |
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 | ||
ef1f7df9 PM |
81 | static struct nft_expr_type nft_counter_type; |
82 | static const struct nft_expr_ops nft_counter_ops = { | |
83 | .type = &nft_counter_type, | |
96518518 | 84 | .size = NFT_EXPR_SIZE(sizeof(struct nft_counter)), |
96518518 PM |
85 | .eval = nft_counter_eval, |
86 | .init = nft_counter_init, | |
87 | .dump = nft_counter_dump, | |
88 | }; | |
89 | ||
ef1f7df9 PM |
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, | |
151d799a | 95 | .flags = NFT_EXPR_STATEFUL, |
ef1f7df9 PM |
96 | .owner = THIS_MODULE, |
97 | }; | |
98 | ||
96518518 PM |
99 | static int __init nft_counter_module_init(void) |
100 | { | |
ef1f7df9 | 101 | return nft_register_expr(&nft_counter_type); |
96518518 PM |
102 | } |
103 | ||
104 | static void __exit nft_counter_module_exit(void) | |
105 | { | |
ef1f7df9 | 106 | nft_unregister_expr(&nft_counter_type); |
96518518 PM |
107 | } |
108 | ||
109 | module_init(nft_counter_module_init); | |
110 | module_exit(nft_counter_module_exit); | |
111 | ||
112 | MODULE_LICENSE("GPL"); | |
113 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
114 | MODULE_ALIAS_NFT_EXPR("counter"); |