netfilter: nf_log: fix sleeping function called from invalid context
[linux-2.6.git] / net / netfilter / nf_conntrack_acct.c
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                 .ctl_name       = CTL_UNNUMBERED,
34                 .procname       = "nf_conntrack_acct",
35                 .data           = &init_net.ct.sysctl_acct,
36                 .maxlen         = sizeof(unsigned int),
37                 .mode           = 0644,
38                 .proc_handler   = proc_dointvec,
39         },
40         {}
41 };
42 #endif /* CONFIG_SYSCTL */
43
44 unsigned int
45 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
46 {
47         struct nf_conn_counter *acct;
48
49         acct = nf_conn_acct_find(ct);
50         if (!acct)
51                 return 0;
52
53         return seq_printf(s, "packets=%llu bytes=%llu ",
54                           (unsigned long long)acct[dir].packets,
55                           (unsigned long long)acct[dir].bytes);
56 };
57 EXPORT_SYMBOL_GPL(seq_print_acct);
58
59 static struct nf_ct_ext_type acct_extend __read_mostly = {
60         .len    = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
61         .align  = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
62         .id     = NF_CT_EXT_ACCT,
63 };
64
65 #ifdef CONFIG_SYSCTL
66 static int nf_conntrack_acct_init_sysctl(struct net *net)
67 {
68         struct ctl_table *table;
69
70         table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
71                         GFP_KERNEL);
72         if (!table)
73                 goto out;
74
75         table[0].data = &net->ct.sysctl_acct;
76
77         net->ct.acct_sysctl_header = register_net_sysctl_table(net,
78                         nf_net_netfilter_sysctl_path, table);
79         if (!net->ct.acct_sysctl_header) {
80                 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
81                 goto out_register;
82         }
83         return 0;
84
85 out_register:
86         kfree(table);
87 out:
88         return -ENOMEM;
89 }
90
91 static void nf_conntrack_acct_fini_sysctl(struct net *net)
92 {
93         struct ctl_table *table;
94
95         table = net->ct.acct_sysctl_header->ctl_table_arg;
96         unregister_net_sysctl_table(net->ct.acct_sysctl_header);
97         kfree(table);
98 }
99 #else
100 static int nf_conntrack_acct_init_sysctl(struct net *net)
101 {
102         return 0;
103 }
104
105 static void nf_conntrack_acct_fini_sysctl(struct net *net)
106 {
107 }
108 #endif
109
110 int nf_conntrack_acct_init(struct net *net)
111 {
112         int ret;
113
114         net->ct.sysctl_acct = nf_ct_acct;
115
116         if (net_eq(net, &init_net)) {
117 #ifdef CONFIG_NF_CT_ACCT
118         printk(KERN_WARNING "CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use\n");
119                 printk(KERN_WARNING "nf_conntrack.acct=1 kernel paramater, acct=1 nf_conntrack module option or\n");
120                 printk(KERN_WARNING "sysctl net.netfilter.nf_conntrack_acct=1 to enable it.\n");
121 #endif
122
123                 ret = nf_ct_extend_register(&acct_extend);
124                 if (ret < 0) {
125                         printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n");
126                         goto out_extend_register;
127                 }
128         }
129
130         ret = nf_conntrack_acct_init_sysctl(net);
131         if (ret < 0)
132                 goto out_sysctl;
133
134         return 0;
135
136 out_sysctl:
137         if (net_eq(net, &init_net))
138                 nf_ct_extend_unregister(&acct_extend);
139 out_extend_register:
140         return ret;
141 }
142
143 void nf_conntrack_acct_fini(struct net *net)
144 {
145         nf_conntrack_acct_fini_sysctl(net);
146         if (net_eq(net, &init_net))
147                 nf_ct_extend_unregister(&acct_extend);
148 }