| /* Accouting handling for netfilter. */ |
| |
| /* |
| * (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/netfilter.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/moduleparam.h> |
| #include <linux/export.h> |
| |
| #include <net/netfilter/nf_conntrack.h> |
| #include <net/netfilter/nf_conntrack_extend.h> |
| #include <net/netfilter/nf_conntrack_acct.h> |
| |
| static bool nf_ct_acct __read_mostly; |
| |
| module_param_named(acct, nf_ct_acct, bool, 0644); |
| MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting."); |
| |
| #ifdef CONFIG_SYSCTL |
| static struct ctl_table acct_sysctl_table[] = { |
| { |
| .procname = "nf_conntrack_acct", |
| .data = &init_net.ct.sysctl_acct, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| {} |
| }; |
| #endif /* CONFIG_SYSCTL */ |
| |
| unsigned int |
| seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir) |
| { |
| struct nf_conn_acct *acct; |
| struct nf_conn_counter *counter; |
| |
| acct = nf_conn_acct_find(ct); |
| if (!acct) |
| return 0; |
| |
| counter = acct->counter; |
| seq_printf(s, "packets=%llu bytes=%llu ", |
| (unsigned long long)atomic64_read(&counter[dir].packets), |
| (unsigned long long)atomic64_read(&counter[dir].bytes)); |
| |
| return 0; |
| }; |
| EXPORT_SYMBOL_GPL(seq_print_acct); |
| |
| static const struct nf_ct_ext_type acct_extend = { |
| .len = sizeof(struct nf_conn_acct), |
| .align = __alignof__(struct nf_conn_acct), |
| .id = NF_CT_EXT_ACCT, |
| }; |
| |
| #ifdef CONFIG_SYSCTL |
| static int nf_conntrack_acct_init_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table), |
| GFP_KERNEL); |
| if (!table) |
| goto out; |
| |
| table[0].data = &net->ct.sysctl_acct; |
| |
| /* Don't export sysctls to unprivileged users */ |
| if (net->user_ns != &init_user_ns) |
| table[0].procname = NULL; |
| |
| net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter", |
| table); |
| if (!net->ct.acct_sysctl_header) { |
| printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n"); |
| goto out_register; |
| } |
| return 0; |
| |
| out_register: |
| kfree(table); |
| out: |
| return -ENOMEM; |
| } |
| |
| static void nf_conntrack_acct_fini_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| table = net->ct.acct_sysctl_header->ctl_table_arg; |
| unregister_net_sysctl_table(net->ct.acct_sysctl_header); |
| kfree(table); |
| } |
| #else |
| static int nf_conntrack_acct_init_sysctl(struct net *net) |
| { |
| return 0; |
| } |
| |
| static void nf_conntrack_acct_fini_sysctl(struct net *net) |
| { |
| } |
| #endif |
| |
| int nf_conntrack_acct_pernet_init(struct net *net) |
| { |
| net->ct.sysctl_acct = nf_ct_acct; |
| return nf_conntrack_acct_init_sysctl(net); |
| } |
| |
| void nf_conntrack_acct_pernet_fini(struct net *net) |
| { |
| nf_conntrack_acct_fini_sysctl(net); |
| } |
| |
| int nf_conntrack_acct_init(void) |
| { |
| int ret = nf_ct_extend_register(&acct_extend); |
| if (ret < 0) |
| pr_err("nf_conntrack_acct: Unable to register extension\n"); |
| return ret; |
| } |
| |
| void nf_conntrack_acct_fini(void) |
| { |
| nf_ct_extend_unregister(&acct_extend); |
| } |