| 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_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 ", |
| 49 | (unsigned long long)atomic64_read(&acct[dir].packets), |
| 50 | (unsigned long long)atomic64_read(&acct[dir].bytes)); |
| 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 | |
| 60 | #ifdef CONFIG_SYSCTL |
| 61 | static int nf_conntrack_acct_init_sysctl(struct net *net) |
| 62 | { |
| 63 | struct ctl_table *table; |
| 64 | |
| 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; |
| 71 | |
| 72 | /* Don't export sysctls to unprivileged users */ |
| 73 | if (net->user_ns != &init_user_ns) |
| 74 | table[0].procname = NULL; |
| 75 | |
| 76 | net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter", |
| 77 | 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_pernet_init(struct net *net) |
| 110 | { |
| 111 | net->ct.sysctl_acct = nf_ct_acct; |
| 112 | return nf_conntrack_acct_init_sysctl(net); |
| 113 | } |
| 114 | |
| 115 | void nf_conntrack_acct_pernet_fini(struct net *net) |
| 116 | { |
| 117 | nf_conntrack_acct_fini_sysctl(net); |
| 118 | } |
| 119 | |
| 120 | int nf_conntrack_acct_init(void) |
| 121 | { |
| 122 | int ret = nf_ct_extend_register(&acct_extend); |
| 123 | if (ret < 0) |
| 124 | pr_err("nf_conntrack_acct: Unable to register extension\n"); |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | void nf_conntrack_acct_fini(void) |
| 129 | { |
| 130 | nf_ct_extend_unregister(&acct_extend); |
| 131 | } |