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- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
- *
- * 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_NF_CONNTRACK_PROCFS
- void
- print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_l3proto *l3proto,
- const struct nf_conntrack_l4proto *l4proto)
- {
- 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_get_real_ns();
- 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 void 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;
- seq_printf(s, "secctx=%s ", secctx);
- security_release_secctx(secctx, len);
- }
- #else
- static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
- {
- }
- #endif
- #ifdef CONFIG_NF_CONNTRACK_ZONES
- static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
- int dir)
- {
- const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
- if (zone->dir != dir)
- return;
- switch (zone->dir) {
- case NF_CT_DEFAULT_ZONE_DIR:
- seq_printf(s, "zone=%u ", zone->id);
- break;
- case NF_CT_ZONE_DIR_ORIG:
- seq_printf(s, "zone-orig=%u ", zone->id);
- break;
- case NF_CT_ZONE_DIR_REPL:
- seq_printf(s, "zone-reply=%u ", zone->id);
- break;
- default:
- break;
- }
- }
- #else
- static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
- int dir)
- {
- }
- #endif
- #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
- static void 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;
- seq_printf(s, "delta-time=%llu ",
- (unsigned long long)delta_time);
- }
- return;
- }
- #else
- static inline void
- ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
- {
- }
- #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;
- 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);
- if (l4proto->print_conntrack)
- l4proto->print_conntrack(s, ct);
- print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- l3proto, l4proto);
- ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
- if (seq_has_overflowed(s))
- goto release;
- if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
- goto release;
- if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
- seq_printf(s, "[UNREPLIED] ");
- print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- l3proto, l4proto);
- ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
- if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
- goto release;
- if (test_bit(IPS_ASSURED_BIT, &ct->status))
- seq_printf(s, "[ASSURED] ");
- if (seq_has_overflowed(s))
- goto release;
- #if defined(CONFIG_NF_CONNTRACK_MARK)
- seq_printf(s, "mark=%u ", ct->mark);
- #endif
- ct_show_secctx(s, ct);
- ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
- ct_show_delta_time(s, ct);
- seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
- if (seq_has_overflowed(s))
- 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_create("nf_conntrack", 0440, net->proc_net, &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:
- remove_proc_entry("nf_conntrack", net->proc_net);
- out_nf_conntrack:
- return -ENOMEM;
- }
- static void nf_conntrack_standalone_fini_proc(struct net *net)
- {
- remove_proc_entry("nf_conntrack", net->proc_net_stat);
- remove_proc_entry("nf_conntrack", net->proc_net);
- }
- #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_NF_CONNTRACK_PROCFS */
- /* 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 struct 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 struct ctl_table nf_ct_netfilter_table[] = {
- {
- .procname = "nf_conntrack_max",
- .data = &nf_conntrack_max,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- { }
- };
- static int nf_conntrack_standalone_init_sysctl(struct net *net)
- {
- struct ctl_table *table;
- 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;
- /* Don't export sysctls to unprivileged users */
- if (net->user_ns != &init_user_ns)
- table[0].procname = NULL;
- net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
- if (!net->ct.sysctl_header)
- goto out_unregister_netfilter;
- return 0;
- out_unregister_netfilter:
- kfree(table);
- out_kmemdup:
- return -ENOMEM;
- }
- static void nf_conntrack_standalone_fini_sysctl(struct net *net)
- {
- struct ctl_table *table;
- 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_pernet_init(struct net *net)
- {
- int ret;
- ret = nf_conntrack_init_net(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(net);
- out_init:
- return ret;
- }
- static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
- {
- struct net *net;
- list_for_each_entry(net, net_exit_list, exit_list) {
- nf_conntrack_standalone_fini_sysctl(net);
- nf_conntrack_standalone_fini_proc(net);
- }
- nf_conntrack_cleanup_net_list(net_exit_list);
- }
- static struct pernet_operations nf_conntrack_net_ops = {
- .init = nf_conntrack_pernet_init,
- .exit_batch = nf_conntrack_pernet_exit,
- };
- static int __init nf_conntrack_standalone_init(void)
- {
- int ret = nf_conntrack_init_start();
- if (ret < 0)
- goto out_start;
- #ifdef CONFIG_SYSCTL
- nf_ct_netfilter_header =
- register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
- if (!nf_ct_netfilter_header) {
- pr_err("nf_conntrack: can't register to sysctl.\n");
- ret = -ENOMEM;
- goto out_sysctl;
- }
- #endif
- ret = register_pernet_subsys(&nf_conntrack_net_ops);
- if (ret < 0)
- goto out_pernet;
- nf_conntrack_init_end();
- return 0;
- out_pernet:
- #ifdef CONFIG_SYSCTL
- unregister_net_sysctl_table(nf_ct_netfilter_header);
- out_sysctl:
- #endif
- nf_conntrack_cleanup_end();
- out_start:
- return ret;
- }
- static void __exit nf_conntrack_standalone_fini(void)
- {
- nf_conntrack_cleanup_start();
- unregister_pernet_subsys(&nf_conntrack_net_ops);
- #ifdef CONFIG_SYSCTL
- unregister_net_sysctl_table(nf_ct_netfilter_header);
- #endif
- nf_conntrack_cleanup_end();
- }
- 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);
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