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
seq_print_acct(struct seq_file * s,const struct nf_conn * ct,int dir)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 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 return 0;
55 };
56 EXPORT_SYMBOL_GPL(seq_print_acct);
57
58 static struct nf_ct_ext_type acct_extend __read_mostly = {
59 .len = sizeof(struct nf_conn_acct),
60 .align = __alignof__(struct nf_conn_acct),
61 .id = NF_CT_EXT_ACCT,
62 };
63
64 #ifdef CONFIG_SYSCTL
nf_conntrack_acct_init_sysctl(struct net * net)65 static int nf_conntrack_acct_init_sysctl(struct net *net)
66 {
67 struct ctl_table *table;
68
69 table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
70 GFP_KERNEL);
71 if (!table)
72 goto out;
73
74 table[0].data = &net->ct.sysctl_acct;
75
76 /* Don't export sysctls to unprivileged users */
77 if (net->user_ns != &init_user_ns)
78 table[0].procname = NULL;
79
80 net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter",
81 table);
82 if (!net->ct.acct_sysctl_header) {
83 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
84 goto out_register;
85 }
86 return 0;
87
88 out_register:
89 kfree(table);
90 out:
91 return -ENOMEM;
92 }
93
nf_conntrack_acct_fini_sysctl(struct net * net)94 static void nf_conntrack_acct_fini_sysctl(struct net *net)
95 {
96 struct ctl_table *table;
97
98 table = net->ct.acct_sysctl_header->ctl_table_arg;
99 unregister_net_sysctl_table(net->ct.acct_sysctl_header);
100 kfree(table);
101 }
102 #else
nf_conntrack_acct_init_sysctl(struct net * net)103 static int nf_conntrack_acct_init_sysctl(struct net *net)
104 {
105 return 0;
106 }
107
nf_conntrack_acct_fini_sysctl(struct net * net)108 static void nf_conntrack_acct_fini_sysctl(struct net *net)
109 {
110 }
111 #endif
112
nf_conntrack_acct_pernet_init(struct net * net)113 int nf_conntrack_acct_pernet_init(struct net *net)
114 {
115 net->ct.sysctl_acct = nf_ct_acct;
116 return nf_conntrack_acct_init_sysctl(net);
117 }
118
nf_conntrack_acct_pernet_fini(struct net * net)119 void nf_conntrack_acct_pernet_fini(struct net *net)
120 {
121 nf_conntrack_acct_fini_sysctl(net);
122 }
123
nf_conntrack_acct_init(void)124 int nf_conntrack_acct_init(void)
125 {
126 int ret = nf_ct_extend_register(&acct_extend);
127 if (ret < 0)
128 pr_err("nf_conntrack_acct: Unable to register extension\n");
129 return ret;
130 }
131
nf_conntrack_acct_fini(void)132 void nf_conntrack_acct_fini(void)
133 {
134 nf_ct_extend_unregister(&acct_extend);
135 }
136