| /* (C) 1999-2001 Paul `Rusty' Russell |
| * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| * |
| * 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/types.h> |
| #include <linux/netfilter.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/percpu.h> |
| #include <linux/netdevice.h> |
| #include <linux/security.h> |
| #include <net/net_namespace.h> |
| #ifdef CONFIG_SYSCTL |
| #include <linux/sysctl.h> |
| #endif |
| |
| #include <net/netfilter/nf_conntrack.h> |
| #include <net/netfilter/nf_conntrack_core.h> |
| #include <net/netfilter/nf_conntrack_l3proto.h> |
| #include <net/netfilter/nf_conntrack_l4proto.h> |
| #include <net/netfilter/nf_conntrack_expect.h> |
| #include <net/netfilter/nf_conntrack_helper.h> |
| #include <net/netfilter/nf_conntrack_acct.h> |
| #include <net/netfilter/nf_conntrack_zones.h> |
| #include <net/netfilter/nf_conntrack_timestamp.h> |
| #include <linux/rculist_nulls.h> |
| |
| MODULE_LICENSE("GPL"); |
| |
| #ifdef CONFIG_PROC_FS |
| int |
| print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, |
| const struct nf_conntrack_l3proto *l3proto, |
| const struct nf_conntrack_l4proto *l4proto) |
| { |
| return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple); |
| } |
| EXPORT_SYMBOL_GPL(print_tuple); |
| |
| struct ct_iter_state { |
| struct seq_net_private p; |
| unsigned int bucket; |
| u_int64_t time_now; |
| }; |
| |
| static struct hlist_nulls_node *ct_get_first(struct seq_file *seq) |
| { |
| struct net *net = seq_file_net(seq); |
| struct ct_iter_state *st = seq->private; |
| struct hlist_nulls_node *n; |
| |
| for (st->bucket = 0; |
| st->bucket < net->ct.htable_size; |
| st->bucket++) { |
| n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket])); |
| if (!is_a_nulls(n)) |
| return n; |
| } |
| return NULL; |
| } |
| |
| static struct hlist_nulls_node *ct_get_next(struct seq_file *seq, |
| struct hlist_nulls_node *head) |
| { |
| struct net *net = seq_file_net(seq); |
| struct ct_iter_state *st = seq->private; |
| |
| head = rcu_dereference(hlist_nulls_next_rcu(head)); |
| while (is_a_nulls(head)) { |
| if (likely(get_nulls_value(head) == st->bucket)) { |
| if (++st->bucket >= net->ct.htable_size) |
| return NULL; |
| } |
| head = rcu_dereference( |
| hlist_nulls_first_rcu( |
| &net->ct.hash[st->bucket])); |
| } |
| return head; |
| } |
| |
| static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos) |
| { |
| struct hlist_nulls_node *head = ct_get_first(seq); |
| |
| if (head) |
| while (pos && (head = ct_get_next(seq, head))) |
| pos--; |
| return pos ? NULL : head; |
| } |
| |
| static void *ct_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(RCU) |
| { |
| struct ct_iter_state *st = seq->private; |
| |
| st->time_now = ktime_to_ns(ktime_get_real()); |
| rcu_read_lock(); |
| return ct_get_idx(seq, *pos); |
| } |
| |
| static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| (*pos)++; |
| return ct_get_next(s, v); |
| } |
| |
| static void ct_seq_stop(struct seq_file *s, void *v) |
| __releases(RCU) |
| { |
| rcu_read_unlock(); |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) |
| { |
| int ret; |
| u32 len; |
| char *secctx; |
| |
| ret = security_secid_to_secctx(ct->secmark, &secctx, &len); |
| if (ret) |
| return 0; |
| |
| ret = seq_printf(s, "secctx=%s ", secctx); |
| |
| security_release_secctx(secctx, len); |
| return ret; |
| } |
| #else |
| static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) |
| { |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP |
| static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) |
| { |
| struct ct_iter_state *st = s->private; |
| struct nf_conn_tstamp *tstamp; |
| s64 delta_time; |
| |
| tstamp = nf_conn_tstamp_find(ct); |
| if (tstamp) { |
| delta_time = st->time_now - tstamp->start; |
| if (delta_time > 0) |
| delta_time = div_s64(delta_time, NSEC_PER_SEC); |
| else |
| delta_time = 0; |
| |
| return seq_printf(s, "delta-time=%llu ", |
| (unsigned long long)delta_time); |
| } |
| return 0; |
| } |
| #else |
| static inline int |
| ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) |
| { |
| return 0; |
| } |
| #endif |
| |
| /* return 0 on success, 1 in case of error */ |
| static int ct_seq_show(struct seq_file *s, void *v) |
| { |
| struct nf_conntrack_tuple_hash *hash = v; |
| struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash); |
| const struct nf_conntrack_l3proto *l3proto; |
| const struct nf_conntrack_l4proto *l4proto; |
| int ret = 0; |
| |
| NF_CT_ASSERT(ct); |
| if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| return 0; |
| |
| /* we only want to print DIR_ORIGINAL */ |
| if (NF_CT_DIRECTION(hash)) |
| goto release; |
| |
| l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); |
| NF_CT_ASSERT(l3proto); |
| l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
| NF_CT_ASSERT(l4proto); |
| |
| ret = -ENOSPC; |
| if (seq_printf(s, "%-8s %u %-8s %u %ld ", |
| l3proto->name, nf_ct_l3num(ct), |
| l4proto->name, nf_ct_protonum(ct), |
| timer_pending(&ct->timeout) |
| ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0) |
| goto release; |
| |
| if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct)) |
| goto release; |
| |
| if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| l3proto, l4proto)) |
| goto release; |
| |
| if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL)) |
| goto release; |
| |
| if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status))) |
| if (seq_printf(s, "[UNREPLIED] ")) |
| goto release; |
| |
| if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| l3proto, l4proto)) |
| goto release; |
| |
| if (seq_print_acct(s, ct, IP_CT_DIR_REPLY)) |
| goto release; |
| |
| if (test_bit(IPS_ASSURED_BIT, &ct->status)) |
| if (seq_printf(s, "[ASSURED] ")) |
| goto release; |
| |
| #ifdef CONFIG_COMCERTO_FP |
| if (test_bit(IPS_PERMANENT_BIT, &ct->status)) |
| if (seq_printf(s, "[PERMANENT] ")) |
| goto release; |
| #endif |
| |
| #if defined(CONFIG_NF_CONNTRACK_MARK) |
| if (seq_printf(s, "mark=%u ", ct->mark)) |
| goto release; |
| #endif |
| |
| if (ct_show_secctx(s, ct)) |
| goto release; |
| |
| #ifdef CONFIG_NF_CONNTRACK_ZONES |
| if (seq_printf(s, "zone=%u ", nf_ct_zone(ct))) |
| goto release; |
| #endif |
| |
| if (ct_show_delta_time(s, ct)) |
| goto release; |
| |
| #if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) |
| if(ct->layer7.app_proto && |
| seq_printf(s, "l7proto=%s ", ct->layer7.app_proto)) |
| return -ENOSPC; |
| #endif |
| |
| if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use))) |
| goto release; |
| |
| ret = 0; |
| release: |
| nf_ct_put(ct); |
| return ret; |
| } |
| |
| static const struct seq_operations ct_seq_ops = { |
| .start = ct_seq_start, |
| .next = ct_seq_next, |
| .stop = ct_seq_stop, |
| .show = ct_seq_show |
| }; |
| |
| static int ct_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &ct_seq_ops, |
| sizeof(struct ct_iter_state)); |
| } |
| |
| static const struct file_operations ct_file_ops = { |
| .owner = THIS_MODULE, |
| .open = ct_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct net *net = seq_file_net(seq); |
| int cpu; |
| |
| if (*pos == 0) |
| return SEQ_START_TOKEN; |
| |
| for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
| if (!cpu_possible(cpu)) |
| continue; |
| *pos = cpu + 1; |
| return per_cpu_ptr(net->ct.stat, cpu); |
| } |
| |
| return NULL; |
| } |
| |
| static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct net *net = seq_file_net(seq); |
| int cpu; |
| |
| for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
| if (!cpu_possible(cpu)) |
| continue; |
| *pos = cpu + 1; |
| return per_cpu_ptr(net->ct.stat, cpu); |
| } |
| |
| return NULL; |
| } |
| |
| static void ct_cpu_seq_stop(struct seq_file *seq, void *v) |
| { |
| } |
| |
| static int ct_cpu_seq_show(struct seq_file *seq, void *v) |
| { |
| struct net *net = seq_file_net(seq); |
| unsigned int nr_conntracks = atomic_read(&net->ct.count); |
| const struct ip_conntrack_stat *st = v; |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete search_restart\n"); |
| return 0; |
| } |
| |
| seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " |
| "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
| nr_conntracks, |
| st->searched, |
| st->found, |
| st->new, |
| st->invalid, |
| st->ignore, |
| st->delete, |
| st->delete_list, |
| st->insert, |
| st->insert_failed, |
| st->drop, |
| st->early_drop, |
| st->error, |
| |
| st->expect_new, |
| st->expect_create, |
| st->expect_delete, |
| st->search_restart |
| ); |
| return 0; |
| } |
| |
| static const struct seq_operations ct_cpu_seq_ops = { |
| .start = ct_cpu_seq_start, |
| .next = ct_cpu_seq_next, |
| .stop = ct_cpu_seq_stop, |
| .show = ct_cpu_seq_show, |
| }; |
| |
| static int ct_cpu_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &ct_cpu_seq_ops, |
| sizeof(struct seq_net_private)); |
| } |
| |
| static const struct file_operations ct_cpu_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = ct_cpu_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| static int nf_conntrack_standalone_init_proc(struct net *net) |
| { |
| struct proc_dir_entry *pde; |
| |
| pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops); |
| if (!pde) |
| goto out_nf_conntrack; |
| |
| pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat, |
| &ct_cpu_seq_fops); |
| if (!pde) |
| goto out_stat_nf_conntrack; |
| return 0; |
| |
| out_stat_nf_conntrack: |
| proc_net_remove(net, "nf_conntrack"); |
| out_nf_conntrack: |
| return -ENOMEM; |
| } |
| |
| static void nf_conntrack_standalone_fini_proc(struct net *net) |
| { |
| remove_proc_entry("nf_conntrack", net->proc_net_stat); |
| proc_net_remove(net, "nf_conntrack"); |
| } |
| #else |
| static int nf_conntrack_standalone_init_proc(struct net *net) |
| { |
| return 0; |
| } |
| |
| static void nf_conntrack_standalone_fini_proc(struct net *net) |
| { |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| /* Sysctl support */ |
| |
| #ifdef CONFIG_SYSCTL |
| /* Log invalid packets of a given protocol */ |
| static int log_invalid_proto_min = 0; |
| static int log_invalid_proto_max = 255; |
| |
| static struct ctl_table_header *nf_ct_netfilter_header; |
| |
| static ctl_table nf_ct_sysctl_table[] = { |
| { |
| .procname = "nf_conntrack_max", |
| .data = &nf_conntrack_max, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nf_conntrack_count", |
| .data = &init_net.ct.count, |
| .maxlen = sizeof(int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nf_conntrack_buckets", |
| .data = &init_net.ct.htable_size, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nf_conntrack_checksum", |
| .data = &init_net.ct.sysctl_checksum, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nf_conntrack_log_invalid", |
| .data = &init_net.ct.sysctl_log_invalid, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &log_invalid_proto_min, |
| .extra2 = &log_invalid_proto_max, |
| }, |
| { |
| .procname = "nf_conntrack_expect_max", |
| .data = &nf_ct_expect_max, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { } |
| }; |
| |
| #define NET_NF_CONNTRACK_MAX 2089 |
| |
| static ctl_table nf_ct_netfilter_table[] = { |
| { |
| .procname = "nf_conntrack_max", |
| .data = &nf_conntrack_max, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { } |
| }; |
| |
| static struct ctl_path nf_ct_path[] = { |
| { .procname = "net", }, |
| { } |
| }; |
| |
| static int nf_conntrack_standalone_init_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| if (net_eq(net, &init_net)) { |
| nf_ct_netfilter_header = |
| register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table); |
| if (!nf_ct_netfilter_header) |
| goto out; |
| } |
| |
| table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table), |
| GFP_KERNEL); |
| if (!table) |
| goto out_kmemdup; |
| |
| table[1].data = &net->ct.count; |
| table[2].data = &net->ct.htable_size; |
| table[3].data = &net->ct.sysctl_checksum; |
| table[4].data = &net->ct.sysctl_log_invalid; |
| |
| net->ct.sysctl_header = register_net_sysctl_table(net, |
| nf_net_netfilter_sysctl_path, table); |
| if (!net->ct.sysctl_header) |
| goto out_unregister_netfilter; |
| |
| return 0; |
| |
| out_unregister_netfilter: |
| kfree(table); |
| out_kmemdup: |
| if (net_eq(net, &init_net)) |
| unregister_sysctl_table(nf_ct_netfilter_header); |
| out: |
| printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n"); |
| return -ENOMEM; |
| } |
| |
| static void nf_conntrack_standalone_fini_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| if (net_eq(net, &init_net)) |
| unregister_sysctl_table(nf_ct_netfilter_header); |
| table = net->ct.sysctl_header->ctl_table_arg; |
| unregister_net_sysctl_table(net->ct.sysctl_header); |
| kfree(table); |
| } |
| #else |
| static int nf_conntrack_standalone_init_sysctl(struct net *net) |
| { |
| return 0; |
| } |
| |
| static void nf_conntrack_standalone_fini_sysctl(struct net *net) |
| { |
| } |
| #endif /* CONFIG_SYSCTL */ |
| |
| static int nf_conntrack_net_init(struct net *net) |
| { |
| int ret; |
| |
| ret = nf_conntrack_init(net); |
| if (ret < 0) |
| goto out_init; |
| ret = nf_conntrack_standalone_init_proc(net); |
| if (ret < 0) |
| goto out_proc; |
| net->ct.sysctl_checksum = 1; |
| net->ct.sysctl_log_invalid = 0; |
| ret = nf_conntrack_standalone_init_sysctl(net); |
| if (ret < 0) |
| goto out_sysctl; |
| return 0; |
| |
| out_sysctl: |
| nf_conntrack_standalone_fini_proc(net); |
| out_proc: |
| nf_conntrack_cleanup(net); |
| out_init: |
| return ret; |
| } |
| |
| static void nf_conntrack_net_exit(struct net *net) |
| { |
| nf_conntrack_standalone_fini_sysctl(net); |
| nf_conntrack_standalone_fini_proc(net); |
| nf_conntrack_cleanup(net); |
| } |
| |
| static struct pernet_operations nf_conntrack_net_ops = { |
| .init = nf_conntrack_net_init, |
| .exit = nf_conntrack_net_exit, |
| }; |
| |
| static int __init nf_conntrack_standalone_init(void) |
| { |
| return register_pernet_subsys(&nf_conntrack_net_ops); |
| } |
| |
| static void __exit nf_conntrack_standalone_fini(void) |
| { |
| unregister_pernet_subsys(&nf_conntrack_net_ops); |
| } |
| |
| module_init(nf_conntrack_standalone_init); |
| module_exit(nf_conntrack_standalone_fini); |
| |
| /* Some modules need us, but don't depend directly on any symbol. |
| They should call this. */ |
| void need_conntrack(void) |
| { |
| } |
| EXPORT_SYMBOL_GPL(need_conntrack); |