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>
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/moduleparam.h>
15 #include <linux/export.h>
16
17 #include <net/netfilter/nf_conntrack.h>
18 #include <net/netfilter/nf_conntrack_extend.h>
19 #include <net/netfilter/nf_conntrack_acct.h>
20
21 static bool nf_ct_acct __read_mostly;
22
23 module_param_named(acct, nf_ct_acct, bool, 0644);
24 MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
25
26 #ifdef CONFIG_SYSCTL
27 static struct ctl_table acct_sysctl_table[] = {
28 {
29 .procname = "nf_conntrack_acct",
30 .data = &init_net.ct.sysctl_acct,
31 .maxlen = sizeof(unsigned int),
32 .mode = 0644,
33 .proc_handler = proc_dointvec,
34 },
35 {}
36 };
37 #endif /* CONFIG_SYSCTL */
38
39 unsigned int
40 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
41 {
42 struct nf_conn_acct *acct;
43 struct nf_conn_counter *counter;
44
45 acct = nf_conn_acct_find(ct);
46 if (!acct)
47 return 0;
48
49 counter = acct->counter;
50 return seq_printf(s, "packets=%llu bytes=%llu ",
51 (unsigned long long)atomic64_read(&counter[dir].packets),
52 (unsigned long long)atomic64_read(&counter[dir].bytes));
53 };
54 EXPORT_SYMBOL_GPL(seq_print_acct);
55
56 static struct nf_ct_ext_type acct_extend __read_mostly = {
57 .len = sizeof(struct nf_conn_acct),
58 .align = __alignof__(struct nf_conn_acct),
59 .id = NF_CT_EXT_ACCT,
60 };
61
62 #ifdef CONFIG_SYSCTL
63 static int nf_conntrack_acct_init_sysctl(struct net *net)
64 {
65 struct ctl_table *table;
66
67 table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
68 GFP_KERNEL);
69 if (!table)
70 goto out;
71
72 table[0].data = &net->ct.sysctl_acct;
73
74 /* Don't export sysctls to unprivileged users */
75 if (net->user_ns != &init_user_ns)
76 table[0].procname = NULL;
77
78 net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter",
79 table);
80 if (!net->ct.acct_sysctl_header) {
81 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
82 goto out_register;
83 }
84 return 0;
85
86 out_register:
87 kfree(table);
88 out:
89 return -ENOMEM;
90 }
91
92 static void nf_conntrack_acct_fini_sysctl(struct net *net)
93 {
94 struct ctl_table *table;
95
96 table = net->ct.acct_sysctl_header->ctl_table_arg;
97 unregister_net_sysctl_table(net->ct.acct_sysctl_header);
98 kfree(table);
99 }
100 #else
101 static int nf_conntrack_acct_init_sysctl(struct net *net)
102 {
103 return 0;
104 }
105
106 static void nf_conntrack_acct_fini_sysctl(struct net *net)
107 {
108 }
109 #endif
110
111 int nf_conntrack_acct_pernet_init(struct net *net)
112 {
113 net->ct.sysctl_acct = nf_ct_acct;
114 return nf_conntrack_acct_init_sysctl(net);
115 }
116
117 void nf_conntrack_acct_pernet_fini(struct net *net)
118 {
119 nf_conntrack_acct_fini_sysctl(net);
120 }
121
122 int nf_conntrack_acct_init(void)
123 {
124 int ret = nf_ct_extend_register(&acct_extend);
125 if (ret < 0)
126 pr_err("nf_conntrack_acct: Unable to register extension\n");
127 return ret;
128 }
129
130 void nf_conntrack_acct_fini(void)
131 {
132 nf_ct_extend_unregister(&acct_extend);
133 }
134
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