Commit | Line | Data |
---|---|---|
58401572 KPO |
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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
58401572 KPO |
13 | #include <linux/kernel.h> |
14 | #include <linux/moduleparam.h> | |
bc3b2d7f | 15 | #include <linux/export.h> |
58401572 KPO |
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 | ||
eb939922 | 21 | static bool nf_ct_acct __read_mostly; |
58401572 KPO |
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 | |
58401572 KPO |
27 | static struct ctl_table acct_sysctl_table[] = { |
28 | { | |
58401572 | 29 | .procname = "nf_conntrack_acct", |
d716a4df | 30 | .data = &init_net.ct.sysctl_acct, |
58401572 KPO |
31 | .maxlen = sizeof(unsigned int), |
32 | .mode = 0644, | |
6d9f239a | 33 | .proc_handler = proc_dointvec, |
58401572 KPO |
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_counter *acct; | |
43 | ||
44 | acct = nf_conn_acct_find(ct); | |
45 | if (!acct) | |
46 | return 0; | |
47 | ||
48 | return seq_printf(s, "packets=%llu bytes=%llu ", | |
b3e0bfa7 ED |
49 | (unsigned long long)atomic64_read(&acct[dir].packets), |
50 | (unsigned long long)atomic64_read(&acct[dir].bytes)); | |
58401572 KPO |
51 | }; |
52 | EXPORT_SYMBOL_GPL(seq_print_acct); | |
53 | ||
54 | static struct nf_ct_ext_type acct_extend __read_mostly = { | |
55 | .len = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]), | |
56 | .align = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]), | |
57 | .id = NF_CT_EXT_ACCT, | |
58 | }; | |
59 | ||
d716a4df AD |
60 | #ifdef CONFIG_SYSCTL |
61 | static int nf_conntrack_acct_init_sysctl(struct net *net) | |
58401572 | 62 | { |
d716a4df | 63 | struct ctl_table *table; |
58401572 | 64 | |
d716a4df AD |
65 | table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table), |
66 | GFP_KERNEL); | |
67 | if (!table) | |
68 | goto out; | |
69 | ||
70 | table[0].data = &net->ct.sysctl_acct; | |
58401572 | 71 | |
464dc801 EB |
72 | /* Don't export sysctls to unprivileged users */ |
73 | if (net->user_ns != &init_user_ns) | |
74 | table[0].procname = NULL; | |
75 | ||
ec8f23ce EB |
76 | net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter", |
77 | table); | |
d716a4df AD |
78 | if (!net->ct.acct_sysctl_header) { |
79 | printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n"); | |
80 | goto out_register; | |
58401572 | 81 | } |
d716a4df | 82 | return 0; |
58401572 | 83 | |
d716a4df AD |
84 | out_register: |
85 | kfree(table); | |
86 | out: | |
87 | return -ENOMEM; | |
88 | } | |
58401572 | 89 | |
d716a4df AD |
90 | static void nf_conntrack_acct_fini_sysctl(struct net *net) |
91 | { | |
92 | struct ctl_table *table; | |
58401572 | 93 | |
d716a4df AD |
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)) { | |
d716a4df AD |
116 | ret = nf_ct_extend_register(&acct_extend); |
117 | if (ret < 0) { | |
118 | printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n"); | |
119 | goto out_extend_register; | |
120 | } | |
121 | } | |
122 | ||
123 | ret = nf_conntrack_acct_init_sysctl(net); | |
124 | if (ret < 0) | |
125 | goto out_sysctl; | |
126 | ||
58401572 | 127 | return 0; |
d716a4df AD |
128 | |
129 | out_sysctl: | |
130 | if (net_eq(net, &init_net)) | |
131 | nf_ct_extend_unregister(&acct_extend); | |
132 | out_extend_register: | |
133 | return ret; | |
58401572 KPO |
134 | } |
135 | ||
d716a4df | 136 | void nf_conntrack_acct_fini(struct net *net) |
58401572 | 137 | { |
d716a4df AD |
138 | nf_conntrack_acct_fini_sysctl(net); |
139 | if (net_eq(net, &init_net)) | |
140 | nf_ct_extend_unregister(&acct_extend); | |
58401572 | 141 | } |