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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 | 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 | |
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 | ||
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 | |
103 | static int nf_conntrack_acct_init_sysctl(struct net *net) | |
104 | { | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static void nf_conntrack_acct_fini_sysctl(struct net *net) | |
109 | { | |
110 | } | |
111 | #endif | |
112 | ||
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 | ||
119 | void nf_conntrack_acct_pernet_fini(struct net *net) | |
120 | { | |
121 | nf_conntrack_acct_fini_sysctl(net); | |
122 | } | |
123 | ||
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 | ||
132 | void nf_conntrack_acct_fini(void) | |
133 | { | |
134 | nf_ct_extend_unregister(&acct_extend); | |
135 | } |