Commit | Line | Data |
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58401572 KPO |
1 | /* Accouting handling for netfilter. */ |
2 | ||
3 | /* | |
4 | * (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/netfilter.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
58401572 KPO |
13 | #include <linux/kernel.h> |
14 | #include <linux/moduleparam.h> | |
15 | ||
16 | #include <net/netfilter/nf_conntrack.h> | |
17 | #include <net/netfilter/nf_conntrack_extend.h> | |
18 | #include <net/netfilter/nf_conntrack_acct.h> | |
19 | ||
d70a011d | 20 | static int nf_ct_acct __read_mostly; |
58401572 KPO |
21 | |
22 | module_param_named(acct, nf_ct_acct, bool, 0644); | |
23 | MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting."); | |
24 | ||
25 | #ifdef CONFIG_SYSCTL | |
58401572 KPO |
26 | static struct ctl_table acct_sysctl_table[] = { |
27 | { | |
58401572 | 28 | .procname = "nf_conntrack_acct", |
d716a4df | 29 | .data = &init_net.ct.sysctl_acct, |
58401572 KPO |
30 | .maxlen = sizeof(unsigned int), |
31 | .mode = 0644, | |
6d9f239a | 32 | .proc_handler = proc_dointvec, |
58401572 KPO |
33 | }, |
34 | {} | |
35 | }; | |
36 | #endif /* CONFIG_SYSCTL */ | |
37 | ||
38 | unsigned int | |
39 | seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir) | |
40 | { | |
41 | struct nf_conn_counter *acct; | |
42 | ||
43 | acct = nf_conn_acct_find(ct); | |
44 | if (!acct) | |
45 | return 0; | |
46 | ||
47 | return seq_printf(s, "packets=%llu bytes=%llu ", | |
48 | (unsigned long long)acct[dir].packets, | |
49 | (unsigned long long)acct[dir].bytes); | |
50 | }; | |
51 | EXPORT_SYMBOL_GPL(seq_print_acct); | |
52 | ||
53 | static struct nf_ct_ext_type acct_extend __read_mostly = { | |
54 | .len = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]), | |
55 | .align = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]), | |
56 | .id = NF_CT_EXT_ACCT, | |
57 | }; | |
58 | ||
d716a4df AD |
59 | #ifdef CONFIG_SYSCTL |
60 | static int nf_conntrack_acct_init_sysctl(struct net *net) | |
58401572 | 61 | { |
d716a4df | 62 | struct ctl_table *table; |
58401572 | 63 | |
d716a4df AD |
64 | table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table), |
65 | GFP_KERNEL); | |
66 | if (!table) | |
67 | goto out; | |
68 | ||
69 | table[0].data = &net->ct.sysctl_acct; | |
58401572 | 70 | |
d716a4df AD |
71 | net->ct.acct_sysctl_header = register_net_sysctl_table(net, |
72 | nf_net_netfilter_sysctl_path, table); | |
73 | if (!net->ct.acct_sysctl_header) { | |
74 | printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n"); | |
75 | goto out_register; | |
58401572 | 76 | } |
d716a4df | 77 | return 0; |
58401572 | 78 | |
d716a4df AD |
79 | out_register: |
80 | kfree(table); | |
81 | out: | |
82 | return -ENOMEM; | |
83 | } | |
58401572 | 84 | |
d716a4df AD |
85 | static void nf_conntrack_acct_fini_sysctl(struct net *net) |
86 | { | |
87 | struct ctl_table *table; | |
58401572 | 88 | |
d716a4df AD |
89 | table = net->ct.acct_sysctl_header->ctl_table_arg; |
90 | unregister_net_sysctl_table(net->ct.acct_sysctl_header); | |
91 | kfree(table); | |
92 | } | |
93 | #else | |
94 | static int nf_conntrack_acct_init_sysctl(struct net *net) | |
95 | { | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static void nf_conntrack_acct_fini_sysctl(struct net *net) | |
100 | { | |
101 | } | |
102 | #endif | |
103 | ||
104 | int nf_conntrack_acct_init(struct net *net) | |
105 | { | |
106 | int ret; | |
107 | ||
108 | net->ct.sysctl_acct = nf_ct_acct; | |
109 | ||
110 | if (net_eq(net, &init_net)) { | |
d716a4df AD |
111 | ret = nf_ct_extend_register(&acct_extend); |
112 | if (ret < 0) { | |
113 | printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n"); | |
114 | goto out_extend_register; | |
115 | } | |
116 | } | |
117 | ||
118 | ret = nf_conntrack_acct_init_sysctl(net); | |
119 | if (ret < 0) | |
120 | goto out_sysctl; | |
121 | ||
58401572 | 122 | return 0; |
d716a4df AD |
123 | |
124 | out_sysctl: | |
125 | if (net_eq(net, &init_net)) | |
126 | nf_ct_extend_unregister(&acct_extend); | |
127 | out_extend_register: | |
128 | return ret; | |
58401572 KPO |
129 | } |
130 | ||
d716a4df | 131 | void nf_conntrack_acct_fini(struct net *net) |
58401572 | 132 | { |
d716a4df AD |
133 | nf_conntrack_acct_fini_sysctl(net); |
134 | if (net_eq(net, &init_net)) | |
135 | nf_ct_extend_unregister(&acct_extend); | |
58401572 | 136 | } |