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a992ca2a PNA |
1 | /* |
2 | * (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation (or any later at your option). | |
7 | */ | |
8 | ||
9 | #include <linux/netfilter.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/moduleparam.h> | |
13 | ||
14 | #include <net/netfilter/nf_conntrack.h> | |
15 | #include <net/netfilter/nf_conntrack_extend.h> | |
16 | #include <net/netfilter/nf_conntrack_timestamp.h> | |
17 | ||
eb939922 | 18 | static bool nf_ct_tstamp __read_mostly; |
a992ca2a PNA |
19 | |
20 | module_param_named(tstamp, nf_ct_tstamp, bool, 0644); | |
21 | MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping."); | |
22 | ||
23 | #ifdef CONFIG_SYSCTL | |
24 | static struct ctl_table tstamp_sysctl_table[] = { | |
25 | { | |
26 | .procname = "nf_conntrack_timestamp", | |
27 | .data = &init_net.ct.sysctl_tstamp, | |
28 | .maxlen = sizeof(unsigned int), | |
29 | .mode = 0644, | |
30 | .proc_handler = proc_dointvec, | |
31 | }, | |
32 | {} | |
33 | }; | |
34 | #endif /* CONFIG_SYSCTL */ | |
35 | ||
36 | static struct nf_ct_ext_type tstamp_extend __read_mostly = { | |
37 | .len = sizeof(struct nf_conn_tstamp), | |
38 | .align = __alignof__(struct nf_conn_tstamp), | |
39 | .id = NF_CT_EXT_TSTAMP, | |
40 | }; | |
41 | ||
42 | #ifdef CONFIG_SYSCTL | |
43 | static int nf_conntrack_tstamp_init_sysctl(struct net *net) | |
44 | { | |
45 | struct ctl_table *table; | |
46 | ||
47 | table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table), | |
48 | GFP_KERNEL); | |
49 | if (!table) | |
50 | goto out; | |
51 | ||
52 | table[0].data = &net->ct.sysctl_tstamp; | |
53 | ||
464dc801 EB |
54 | /* Don't export sysctls to unprivileged users */ |
55 | if (net->user_ns != &init_user_ns) | |
56 | table[0].procname = NULL; | |
57 | ||
ec8f23ce EB |
58 | net->ct.tstamp_sysctl_header = register_net_sysctl(net, "net/netfilter", |
59 | table); | |
a992ca2a PNA |
60 | if (!net->ct.tstamp_sysctl_header) { |
61 | printk(KERN_ERR "nf_ct_tstamp: can't register to sysctl.\n"); | |
62 | goto out_register; | |
63 | } | |
64 | return 0; | |
65 | ||
66 | out_register: | |
67 | kfree(table); | |
68 | out: | |
69 | return -ENOMEM; | |
70 | } | |
71 | ||
72 | static void nf_conntrack_tstamp_fini_sysctl(struct net *net) | |
73 | { | |
74 | struct ctl_table *table; | |
75 | ||
76 | table = net->ct.tstamp_sysctl_header->ctl_table_arg; | |
77 | unregister_net_sysctl_table(net->ct.tstamp_sysctl_header); | |
78 | kfree(table); | |
79 | } | |
80 | #else | |
81 | static int nf_conntrack_tstamp_init_sysctl(struct net *net) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static void nf_conntrack_tstamp_fini_sysctl(struct net *net) | |
87 | { | |
88 | } | |
89 | #endif | |
90 | ||
91 | int nf_conntrack_tstamp_init(struct net *net) | |
92 | { | |
93 | int ret; | |
94 | ||
95 | net->ct.sysctl_tstamp = nf_ct_tstamp; | |
96 | ||
97 | if (net_eq(net, &init_net)) { | |
98 | ret = nf_ct_extend_register(&tstamp_extend); | |
99 | if (ret < 0) { | |
100 | printk(KERN_ERR "nf_ct_tstamp: Unable to register " | |
101 | "extension\n"); | |
102 | goto out_extend_register; | |
103 | } | |
104 | } | |
105 | ||
106 | ret = nf_conntrack_tstamp_init_sysctl(net); | |
107 | if (ret < 0) | |
108 | goto out_sysctl; | |
109 | ||
110 | return 0; | |
111 | ||
112 | out_sysctl: | |
113 | if (net_eq(net, &init_net)) | |
114 | nf_ct_extend_unregister(&tstamp_extend); | |
115 | out_extend_register: | |
116 | return ret; | |
117 | } | |
118 | ||
119 | void nf_conntrack_tstamp_fini(struct net *net) | |
120 | { | |
121 | nf_conntrack_tstamp_fini_sysctl(net); | |
122 | if (net_eq(net, &init_net)) | |
123 | nf_ct_extend_unregister(&tstamp_extend); | |
124 | } |