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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 | 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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