1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3 * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/types.h>
11 #include <linux/netfilter.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/skbuff.h>
15 #include <linux/proc_fs.h>
16 #include <linux/seq_file.h>
17 #include <linux/percpu.h>
18 #include <linux/netdevice.h>
19 #include <linux/security.h>
20 #include <net/net_namespace.h>
22 #include <linux/sysctl.h>
25 #include <net/netfilter/nf_conntrack.h>
26 #include <net/netfilter/nf_conntrack_core.h>
27 #include <net/netfilter/nf_conntrack_l3proto.h>
28 #include <net/netfilter/nf_conntrack_l4proto.h>
29 #include <net/netfilter/nf_conntrack_expect.h>
30 #include <net/netfilter/nf_conntrack_helper.h>
31 #include <net/netfilter/nf_conntrack_acct.h>
32 #include <net/netfilter/nf_conntrack_zones.h>
33 #include <net/netfilter/nf_conntrack_timestamp.h>
34 #include <linux/rculist_nulls.h>
36 MODULE_LICENSE("GPL");
38 #ifdef CONFIG_NF_CONNTRACK_PROCFS
40 print_tuple(struct seq_file
*s
, const struct nf_conntrack_tuple
*tuple
,
41 const struct nf_conntrack_l3proto
*l3proto
,
42 const struct nf_conntrack_l4proto
*l4proto
)
44 l3proto
->print_tuple(s
, tuple
);
45 l4proto
->print_tuple(s
, tuple
);
47 EXPORT_SYMBOL_GPL(print_tuple
);
49 struct ct_iter_state
{
50 struct seq_net_private p
;
51 struct hlist_nulls_head
*hash
;
52 unsigned int htable_size
;
57 static struct hlist_nulls_node
*ct_get_first(struct seq_file
*seq
)
59 struct ct_iter_state
*st
= seq
->private;
60 struct hlist_nulls_node
*n
;
63 st
->bucket
< st
->htable_size
;
66 hlist_nulls_first_rcu(&st
->hash
[st
->bucket
]));
73 static struct hlist_nulls_node
*ct_get_next(struct seq_file
*seq
,
74 struct hlist_nulls_node
*head
)
76 struct ct_iter_state
*st
= seq
->private;
78 head
= rcu_dereference(hlist_nulls_next_rcu(head
));
79 while (is_a_nulls(head
)) {
80 if (likely(get_nulls_value(head
) == st
->bucket
)) {
81 if (++st
->bucket
>= st
->htable_size
)
84 head
= rcu_dereference(
85 hlist_nulls_first_rcu(&st
->hash
[st
->bucket
]));
90 static struct hlist_nulls_node
*ct_get_idx(struct seq_file
*seq
, loff_t pos
)
92 struct hlist_nulls_node
*head
= ct_get_first(seq
);
95 while (pos
&& (head
= ct_get_next(seq
, head
)))
97 return pos
? NULL
: head
;
100 static void *ct_seq_start(struct seq_file
*seq
, loff_t
*pos
)
103 struct ct_iter_state
*st
= seq
->private;
105 st
->time_now
= ktime_get_real_ns();
108 nf_conntrack_get_ht(&st
->hash
, &st
->htable_size
);
109 return ct_get_idx(seq
, *pos
);
112 static void *ct_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
115 return ct_get_next(s
, v
);
118 static void ct_seq_stop(struct seq_file
*s
, void *v
)
124 #ifdef CONFIG_NF_CONNTRACK_SECMARK
125 static void ct_show_secctx(struct seq_file
*s
, const struct nf_conn
*ct
)
131 ret
= security_secid_to_secctx(ct
->secmark
, &secctx
, &len
);
135 seq_printf(s
, "secctx=%s ", secctx
);
137 security_release_secctx(secctx
, len
);
140 static inline void ct_show_secctx(struct seq_file
*s
, const struct nf_conn
*ct
)
145 #ifdef CONFIG_NF_CONNTRACK_ZONES
146 static void ct_show_zone(struct seq_file
*s
, const struct nf_conn
*ct
,
149 const struct nf_conntrack_zone
*zone
= nf_ct_zone(ct
);
151 if (zone
->dir
!= dir
)
154 case NF_CT_DEFAULT_ZONE_DIR
:
155 seq_printf(s
, "zone=%u ", zone
->id
);
157 case NF_CT_ZONE_DIR_ORIG
:
158 seq_printf(s
, "zone-orig=%u ", zone
->id
);
160 case NF_CT_ZONE_DIR_REPL
:
161 seq_printf(s
, "zone-reply=%u ", zone
->id
);
168 static inline void ct_show_zone(struct seq_file
*s
, const struct nf_conn
*ct
,
174 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
175 static void ct_show_delta_time(struct seq_file
*s
, const struct nf_conn
*ct
)
177 struct ct_iter_state
*st
= s
->private;
178 struct nf_conn_tstamp
*tstamp
;
181 tstamp
= nf_conn_tstamp_find(ct
);
183 delta_time
= st
->time_now
- tstamp
->start
;
185 delta_time
= div_s64(delta_time
, NSEC_PER_SEC
);
189 seq_printf(s
, "delta-time=%llu ",
190 (unsigned long long)delta_time
);
196 ct_show_delta_time(struct seq_file
*s
, const struct nf_conn
*ct
)
201 /* return 0 on success, 1 in case of error */
202 static int ct_seq_show(struct seq_file
*s
, void *v
)
204 struct nf_conntrack_tuple_hash
*hash
= v
;
205 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(hash
);
206 const struct nf_conntrack_l3proto
*l3proto
;
207 const struct nf_conntrack_l4proto
*l4proto
;
208 struct net
*net
= seq_file_net(s
);
212 if (unlikely(!atomic_inc_not_zero(&ct
->ct_general
.use
)))
215 if (nf_ct_should_gc(ct
)) {
220 /* we only want to print DIR_ORIGINAL */
221 if (NF_CT_DIRECTION(hash
))
224 if (!net_eq(nf_ct_net(ct
), net
))
227 l3proto
= __nf_ct_l3proto_find(nf_ct_l3num(ct
));
228 NF_CT_ASSERT(l3proto
);
229 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
230 NF_CT_ASSERT(l4proto
);
233 seq_printf(s
, "%-8s %u %-8s %u %ld ",
234 l3proto
->name
, nf_ct_l3num(ct
),
235 l4proto
->name
, nf_ct_protonum(ct
),
236 nf_ct_expires(ct
) / HZ
);
238 if (l4proto
->print_conntrack
)
239 l4proto
->print_conntrack(s
, ct
);
241 print_tuple(s
, &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
244 ct_show_zone(s
, ct
, NF_CT_ZONE_DIR_ORIG
);
246 if (seq_has_overflowed(s
))
249 if (seq_print_acct(s
, ct
, IP_CT_DIR_ORIGINAL
))
252 if (!(test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
)))
253 seq_puts(s
, "[UNREPLIED] ");
255 print_tuple(s
, &ct
->tuplehash
[IP_CT_DIR_REPLY
].tuple
,
258 ct_show_zone(s
, ct
, NF_CT_ZONE_DIR_REPL
);
260 if (seq_print_acct(s
, ct
, IP_CT_DIR_REPLY
))
263 if (test_bit(IPS_ASSURED_BIT
, &ct
->status
))
264 seq_puts(s
, "[ASSURED] ");
266 if (seq_has_overflowed(s
))
269 #if defined(CONFIG_NF_CONNTRACK_MARK)
270 seq_printf(s
, "mark=%u ", ct
->mark
);
273 ct_show_secctx(s
, ct
);
274 ct_show_zone(s
, ct
, NF_CT_DEFAULT_ZONE_DIR
);
275 ct_show_delta_time(s
, ct
);
277 seq_printf(s
, "use=%u\n", atomic_read(&ct
->ct_general
.use
));
279 if (seq_has_overflowed(s
))
288 static const struct seq_operations ct_seq_ops
= {
289 .start
= ct_seq_start
,
295 static int ct_open(struct inode
*inode
, struct file
*file
)
297 return seq_open_net(inode
, file
, &ct_seq_ops
,
298 sizeof(struct ct_iter_state
));
301 static const struct file_operations ct_file_ops
= {
302 .owner
= THIS_MODULE
,
306 .release
= seq_release_net
,
309 static void *ct_cpu_seq_start(struct seq_file
*seq
, loff_t
*pos
)
311 struct net
*net
= seq_file_net(seq
);
315 return SEQ_START_TOKEN
;
317 for (cpu
= *pos
-1; cpu
< nr_cpu_ids
; ++cpu
) {
318 if (!cpu_possible(cpu
))
321 return per_cpu_ptr(net
->ct
.stat
, cpu
);
327 static void *ct_cpu_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
329 struct net
*net
= seq_file_net(seq
);
332 for (cpu
= *pos
; cpu
< nr_cpu_ids
; ++cpu
) {
333 if (!cpu_possible(cpu
))
336 return per_cpu_ptr(net
->ct
.stat
, cpu
);
342 static void ct_cpu_seq_stop(struct seq_file
*seq
, void *v
)
346 static int ct_cpu_seq_show(struct seq_file
*seq
, void *v
)
348 struct net
*net
= seq_file_net(seq
);
349 unsigned int nr_conntracks
= atomic_read(&net
->ct
.count
);
350 const struct ip_conntrack_stat
*st
= v
;
352 if (v
== SEQ_START_TOKEN
) {
353 seq_puts(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");
357 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x "
358 "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
381 static const struct seq_operations ct_cpu_seq_ops
= {
382 .start
= ct_cpu_seq_start
,
383 .next
= ct_cpu_seq_next
,
384 .stop
= ct_cpu_seq_stop
,
385 .show
= ct_cpu_seq_show
,
388 static int ct_cpu_seq_open(struct inode
*inode
, struct file
*file
)
390 return seq_open_net(inode
, file
, &ct_cpu_seq_ops
,
391 sizeof(struct seq_net_private
));
394 static const struct file_operations ct_cpu_seq_fops
= {
395 .owner
= THIS_MODULE
,
396 .open
= ct_cpu_seq_open
,
399 .release
= seq_release_net
,
402 static int nf_conntrack_standalone_init_proc(struct net
*net
)
404 struct proc_dir_entry
*pde
;
408 pde
= proc_create("nf_conntrack", 0440, net
->proc_net
, &ct_file_ops
);
410 goto out_nf_conntrack
;
412 root_uid
= make_kuid(net
->user_ns
, 0);
413 root_gid
= make_kgid(net
->user_ns
, 0);
414 if (uid_valid(root_uid
) && gid_valid(root_gid
))
415 proc_set_user(pde
, root_uid
, root_gid
);
417 pde
= proc_create("nf_conntrack", S_IRUGO
, net
->proc_net_stat
,
420 goto out_stat_nf_conntrack
;
423 out_stat_nf_conntrack
:
424 remove_proc_entry("nf_conntrack", net
->proc_net
);
429 static void nf_conntrack_standalone_fini_proc(struct net
*net
)
431 remove_proc_entry("nf_conntrack", net
->proc_net_stat
);
432 remove_proc_entry("nf_conntrack", net
->proc_net
);
435 static int nf_conntrack_standalone_init_proc(struct net
*net
)
440 static void nf_conntrack_standalone_fini_proc(struct net
*net
)
443 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
448 /* Log invalid packets of a given protocol */
449 static int log_invalid_proto_min __read_mostly
;
450 static int log_invalid_proto_max __read_mostly
= 255;
452 /* size the user *wants to set */
453 static unsigned int nf_conntrack_htable_size_user __read_mostly
;
455 extern unsigned int nf_conntrack_default_on
;
456 unsigned int nf_conntrack_default_on __read_mostly
= 1;
459 nf_conntrack_hash_sysctl(struct ctl_table
*table
, int write
,
460 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
464 ret
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
465 if (ret
< 0 || !write
)
468 /* update ret, we might not be able to satisfy request */
469 ret
= nf_conntrack_hash_resize(nf_conntrack_htable_size_user
);
471 /* update it to the actual value used by conntrack */
472 nf_conntrack_htable_size_user
= nf_conntrack_htable_size
;
476 static struct ctl_table_header
*nf_ct_netfilter_header
;
478 static struct ctl_table nf_ct_sysctl_table
[] = {
480 .procname
= "nf_conntrack_max",
481 .data
= &nf_conntrack_max
,
482 .maxlen
= sizeof(int),
484 .proc_handler
= proc_dointvec
,
487 .procname
= "nf_conntrack_count",
488 .data
= &init_net
.ct
.count
,
489 .maxlen
= sizeof(int),
491 .proc_handler
= proc_dointvec
,
494 .procname
= "nf_conntrack_buckets",
495 .data
= &nf_conntrack_htable_size_user
,
496 .maxlen
= sizeof(unsigned int),
498 .proc_handler
= nf_conntrack_hash_sysctl
,
501 .procname
= "nf_conntrack_checksum",
502 .data
= &init_net
.ct
.sysctl_checksum
,
503 .maxlen
= sizeof(unsigned int),
505 .proc_handler
= proc_dointvec
,
508 .procname
= "nf_conntrack_log_invalid",
509 .data
= &init_net
.ct
.sysctl_log_invalid
,
510 .maxlen
= sizeof(unsigned int),
512 .proc_handler
= proc_dointvec_minmax
,
513 .extra1
= &log_invalid_proto_min
,
514 .extra2
= &log_invalid_proto_max
,
517 .procname
= "nf_conntrack_expect_max",
518 .data
= &nf_ct_expect_max
,
519 .maxlen
= sizeof(int),
521 .proc_handler
= proc_dointvec
,
524 .procname
= "nf_conntrack_default_on",
525 .data
= &nf_conntrack_default_on
,
526 .maxlen
= sizeof(unsigned int),
528 .proc_handler
= proc_dointvec
,
533 static struct ctl_table nf_ct_netfilter_table
[] = {
535 .procname
= "nf_conntrack_max",
536 .data
= &nf_conntrack_max
,
537 .maxlen
= sizeof(int),
539 .proc_handler
= proc_dointvec
,
544 static int nf_conntrack_standalone_init_sysctl(struct net
*net
)
546 struct ctl_table
*table
;
548 table
= kmemdup(nf_ct_sysctl_table
, sizeof(nf_ct_sysctl_table
),
553 table
[1].data
= &net
->ct
.count
;
554 table
[3].data
= &net
->ct
.sysctl_checksum
;
555 table
[4].data
= &net
->ct
.sysctl_log_invalid
;
557 /* Don't export sysctls to unprivileged users */
558 if (net
->user_ns
!= &init_user_ns
)
559 table
[0].procname
= NULL
;
561 if (!net_eq(&init_net
, net
))
562 table
[2].mode
= 0444;
564 net
->ct
.sysctl_header
= register_net_sysctl(net
, "net/netfilter", table
);
565 if (!net
->ct
.sysctl_header
)
566 goto out_unregister_netfilter
;
570 out_unregister_netfilter
:
576 static void nf_conntrack_standalone_fini_sysctl(struct net
*net
)
578 struct ctl_table
*table
;
580 table
= net
->ct
.sysctl_header
->ctl_table_arg
;
581 unregister_net_sysctl_table(net
->ct
.sysctl_header
);
585 static int nf_conntrack_standalone_init_sysctl(struct net
*net
)
590 static void nf_conntrack_standalone_fini_sysctl(struct net
*net
)
593 #endif /* CONFIG_SYSCTL */
595 static int nf_conntrack_pernet_init(struct net
*net
)
599 ret
= nf_conntrack_init_net(net
);
603 ret
= nf_conntrack_standalone_init_proc(net
);
607 net
->ct
.sysctl_checksum
= 1;
608 net
->ct
.sysctl_log_invalid
= 0;
609 ret
= nf_conntrack_standalone_init_sysctl(net
);
616 nf_conntrack_standalone_fini_proc(net
);
618 nf_conntrack_cleanup_net(net
);
623 static void nf_conntrack_pernet_exit(struct list_head
*net_exit_list
)
627 list_for_each_entry(net
, net_exit_list
, exit_list
) {
628 nf_conntrack_standalone_fini_sysctl(net
);
629 nf_conntrack_standalone_fini_proc(net
);
631 nf_conntrack_cleanup_net_list(net_exit_list
);
634 static struct pernet_operations nf_conntrack_net_ops
= {
635 .init
= nf_conntrack_pernet_init
,
636 .exit_batch
= nf_conntrack_pernet_exit
,
639 static int __init
nf_conntrack_standalone_init(void)
641 int ret
= nf_conntrack_init_start();
645 BUILD_BUG_ON(SKB_NFCT_PTRMASK
!= NFCT_PTRMASK
);
646 BUILD_BUG_ON(NFCT_INFOMASK
<= IP_CT_NUMBER
);
649 nf_ct_netfilter_header
=
650 register_net_sysctl(&init_net
, "net", nf_ct_netfilter_table
);
651 if (!nf_ct_netfilter_header
) {
652 pr_err("nf_conntrack: can't register to sysctl.\n");
657 nf_conntrack_htable_size_user
= nf_conntrack_htable_size
;
660 ret
= register_pernet_subsys(&nf_conntrack_net_ops
);
664 nf_conntrack_init_end();
669 unregister_net_sysctl_table(nf_ct_netfilter_header
);
672 nf_conntrack_cleanup_end();
677 static void __exit
nf_conntrack_standalone_fini(void)
679 nf_conntrack_cleanup_start();
680 unregister_pernet_subsys(&nf_conntrack_net_ops
);
682 unregister_net_sysctl_table(nf_ct_netfilter_header
);
684 nf_conntrack_cleanup_end();
687 module_init(nf_conntrack_standalone_init
);
688 module_exit(nf_conntrack_standalone_fini
);
690 /* Some modules need us, but don't depend directly on any symbol.
691 They should call this. */
692 void need_conntrack(void)
695 EXPORT_SYMBOL_GPL(need_conntrack
);