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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/kernel.h> | |
13 | #include <linux/moduleparam.h> | |
14 | ||
15 | #include <net/netfilter/nf_conntrack.h> | |
16 | #include <net/netfilter/nf_conntrack_extend.h> | |
17 | #include <net/netfilter/nf_conntrack_acct.h> | |
18 | ||
19 | #ifdef CONFIG_NF_CT_ACCT | |
20 | #define NF_CT_ACCT_DEFAULT 1 | |
21 | #else | |
22 | #define NF_CT_ACCT_DEFAULT 0 | |
23 | #endif | |
24 | ||
25 | static int nf_ct_acct __read_mostly = NF_CT_ACCT_DEFAULT; | |
26 | ||
27 | module_param_named(acct, nf_ct_acct, bool, 0644); | |
28 | MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting."); | |
29 | ||
30 | #ifdef CONFIG_SYSCTL | |
31 | static struct ctl_table acct_sysctl_table[] = { | |
32 | { | |
33 | .procname = "nf_conntrack_acct", | |
34 | .data = &init_net.ct.sysctl_acct, | |
35 | .maxlen = sizeof(unsigned int), | |
36 | .mode = 0644, | |
37 | .proc_handler = proc_dointvec, | |
38 | }, | |
39 | {} | |
40 | }; | |
41 | #endif /* CONFIG_SYSCTL */ | |
42 | ||
43 | unsigned int | |
44 | seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir) | |
45 | { | |
46 | struct nf_conn_counter *acct; | |
47 | ||
48 | acct = nf_conn_acct_find(ct); | |
49 | if (!acct) | |
50 | return 0; | |
51 | ||
52 | return seq_printf(s, "packets=%llu bytes=%llu ", | |
53 | (unsigned long long)acct[dir].packets, | |
54 | (unsigned long long)acct[dir].bytes); | |
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_counter[IP_CT_DIR_MAX]), | |
60 | .align = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]), | |
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 | net->ct.acct_sysctl_header = register_net_sysctl_table(net, | |
77 | nf_net_netfilter_sysctl_path, table); | |
78 | if (!net->ct.acct_sysctl_header) { | |
79 | printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n"); | |
80 | goto out_register; | |
81 | } | |
82 | return 0; | |
83 | ||
84 | out_register: | |
85 | kfree(table); | |
86 | out: | |
87 | return -ENOMEM; | |
88 | } | |
89 | ||
90 | static void nf_conntrack_acct_fini_sysctl(struct net *net) | |
91 | { | |
92 | struct ctl_table *table; | |
93 | ||
94 | table = net->ct.acct_sysctl_header->ctl_table_arg; | |
95 | unregister_net_sysctl_table(net->ct.acct_sysctl_header); | |
96 | kfree(table); | |
97 | } | |
98 | #else | |
99 | static int nf_conntrack_acct_init_sysctl(struct net *net) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static void nf_conntrack_acct_fini_sysctl(struct net *net) | |
105 | { | |
106 | } | |
107 | #endif | |
108 | ||
109 | int nf_conntrack_acct_init(struct net *net) | |
110 | { | |
111 | int ret; | |
112 | ||
113 | net->ct.sysctl_acct = nf_ct_acct; | |
114 | ||
115 | if (net_eq(net, &init_net)) { | |
116 | #ifdef CONFIG_NF_CT_ACCT | |
117 | printk(KERN_WARNING "CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use\n"); | |
118 | printk(KERN_WARNING "nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or\n"); | |
119 | printk(KERN_WARNING "sysctl net.netfilter.nf_conntrack_acct=1 to enable it.\n"); | |
120 | #endif | |
121 | ||
122 | ret = nf_ct_extend_register(&acct_extend); | |
123 | if (ret < 0) { | |
124 | printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n"); | |
125 | goto out_extend_register; | |
126 | } | |
127 | } | |
128 | ||
129 | ret = nf_conntrack_acct_init_sysctl(net); | |
130 | if (ret < 0) | |
131 | goto out_sysctl; | |
132 | ||
133 | return 0; | |
134 | ||
135 | out_sysctl: | |
136 | if (net_eq(net, &init_net)) | |
137 | nf_ct_extend_unregister(&acct_extend); | |
138 | out_extend_register: | |
139 | return ret; | |
140 | } | |
141 | ||
142 | void nf_conntrack_acct_fini(struct net *net) | |
143 | { | |
144 | nf_conntrack_acct_fini_sysctl(net); | |
145 | if (net_eq(net, &init_net)) | |
146 | nf_ct_extend_unregister(&acct_extend); | |
147 | } |