1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
3 #include <linux/netfilter.h>
4 #include <linux/slab.h>
5 #include <linux/module.h>
6 #include <linux/skbuff.h>
7 #include <linux/proc_fs.h>
8 #include <linux/seq_file.h>
9 #include <linux/percpu.h>
10 #include <linux/netdevice.h>
11 #include <linux/security.h>
12 #include <net/net_namespace.h>
13 #ifdef CONFIG_SYSCTL
14 #include <linux/sysctl.h>
15 #endif
16 
17 #include <net/netfilter/nf_conntrack.h>
18 #include <net/netfilter/nf_conntrack_core.h>
19 #include <net/netfilter/nf_conntrack_l4proto.h>
20 #include <net/netfilter/nf_conntrack_expect.h>
21 #include <net/netfilter/nf_conntrack_helper.h>
22 #include <net/netfilter/nf_conntrack_acct.h>
23 #include <net/netfilter/nf_conntrack_zones.h>
24 #include <net/netfilter/nf_conntrack_timestamp.h>
25 #include <linux/rculist_nulls.h>
26 
27 static bool enable_hooks __read_mostly;
28 MODULE_PARM_DESC(enable_hooks, "Always enable conntrack hooks");
29 module_param(enable_hooks, bool, 0000);
30 
31 unsigned int nf_conntrack_net_id __read_mostly;
32 
33 #ifdef CONFIG_NF_CONNTRACK_PROCFS
34 void
print_tuple(struct seq_file * s,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_l4proto * l4proto)35 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
36             const struct nf_conntrack_l4proto *l4proto)
37 {
38 	switch (tuple->src.l3num) {
39 	case NFPROTO_IPV4:
40 		seq_printf(s, "src=%pI4 dst=%pI4 ",
41 			   &tuple->src.u3.ip, &tuple->dst.u3.ip);
42 		break;
43 	case NFPROTO_IPV6:
44 		seq_printf(s, "src=%pI6 dst=%pI6 ",
45 			   tuple->src.u3.ip6, tuple->dst.u3.ip6);
46 		break;
47 	default:
48 		break;
49 	}
50 
51 	switch (l4proto->l4proto) {
52 	case IPPROTO_ICMP:
53 		seq_printf(s, "type=%u code=%u id=%u ",
54 			   tuple->dst.u.icmp.type,
55 			   tuple->dst.u.icmp.code,
56 			   ntohs(tuple->src.u.icmp.id));
57 		break;
58 	case IPPROTO_TCP:
59 		seq_printf(s, "sport=%hu dport=%hu ",
60 			   ntohs(tuple->src.u.tcp.port),
61 			   ntohs(tuple->dst.u.tcp.port));
62 		break;
63 	case IPPROTO_UDPLITE:
64 	case IPPROTO_UDP:
65 		seq_printf(s, "sport=%hu dport=%hu ",
66 			   ntohs(tuple->src.u.udp.port),
67 			   ntohs(tuple->dst.u.udp.port));
68 
69 		break;
70 	case IPPROTO_DCCP:
71 		seq_printf(s, "sport=%hu dport=%hu ",
72 			   ntohs(tuple->src.u.dccp.port),
73 			   ntohs(tuple->dst.u.dccp.port));
74 		break;
75 	case IPPROTO_SCTP:
76 		seq_printf(s, "sport=%hu dport=%hu ",
77 			   ntohs(tuple->src.u.sctp.port),
78 			   ntohs(tuple->dst.u.sctp.port));
79 		break;
80 	case IPPROTO_ICMPV6:
81 		seq_printf(s, "type=%u code=%u id=%u ",
82 			   tuple->dst.u.icmp.type,
83 			   tuple->dst.u.icmp.code,
84 			   ntohs(tuple->src.u.icmp.id));
85 		break;
86 	case IPPROTO_GRE:
87 		seq_printf(s, "srckey=0x%x dstkey=0x%x ",
88 			   ntohs(tuple->src.u.gre.key),
89 			   ntohs(tuple->dst.u.gre.key));
90 		break;
91 	default:
92 		break;
93 	}
94 }
95 EXPORT_SYMBOL_GPL(print_tuple);
96 
97 struct ct_iter_state {
98 	struct seq_net_private p;
99 	struct hlist_nulls_head *hash;
100 	unsigned int htable_size;
101 	unsigned int bucket;
102 	u_int64_t time_now;
103 };
104 
ct_get_first(struct seq_file * seq)105 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
106 {
107 	struct ct_iter_state *st = seq->private;
108 	struct hlist_nulls_node *n;
109 
110 	for (st->bucket = 0;
111 	     st->bucket < st->htable_size;
112 	     st->bucket++) {
113 		n = rcu_dereference(
114 			hlist_nulls_first_rcu(&st->hash[st->bucket]));
115 		if (!is_a_nulls(n))
116 			return n;
117 	}
118 	return NULL;
119 }
120 
ct_get_next(struct seq_file * seq,struct hlist_nulls_node * head)121 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
122 				      struct hlist_nulls_node *head)
123 {
124 	struct ct_iter_state *st = seq->private;
125 
126 	head = rcu_dereference(hlist_nulls_next_rcu(head));
127 	while (is_a_nulls(head)) {
128 		if (likely(get_nulls_value(head) == st->bucket)) {
129 			if (++st->bucket >= st->htable_size)
130 				return NULL;
131 		}
132 		head = rcu_dereference(
133 			hlist_nulls_first_rcu(&st->hash[st->bucket]));
134 	}
135 	return head;
136 }
137 
ct_get_idx(struct seq_file * seq,loff_t pos)138 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
139 {
140 	struct hlist_nulls_node *head = ct_get_first(seq);
141 
142 	if (head)
143 		while (pos && (head = ct_get_next(seq, head)))
144 			pos--;
145 	return pos ? NULL : head;
146 }
147 
ct_seq_start(struct seq_file * seq,loff_t * pos)148 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
149 	__acquires(RCU)
150 {
151 	struct ct_iter_state *st = seq->private;
152 
153 	st->time_now = ktime_get_real_ns();
154 	rcu_read_lock();
155 
156 	nf_conntrack_get_ht(&st->hash, &st->htable_size);
157 	return ct_get_idx(seq, *pos);
158 }
159 
ct_seq_next(struct seq_file * s,void * v,loff_t * pos)160 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
161 {
162 	(*pos)++;
163 	return ct_get_next(s, v);
164 }
165 
ct_seq_stop(struct seq_file * s,void * v)166 static void ct_seq_stop(struct seq_file *s, void *v)
167 	__releases(RCU)
168 {
169 	rcu_read_unlock();
170 }
171 
172 #ifdef CONFIG_NF_CONNTRACK_SECMARK
ct_show_secctx(struct seq_file * s,const struct nf_conn * ct)173 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
174 {
175 	struct lsm_context ctx;
176 	int ret;
177 
178 	ret = security_secid_to_secctx(ct->secmark, &ctx);
179 	if (ret < 0)
180 		return;
181 
182 	seq_printf(s, "secctx=%s ", ctx.context);
183 
184 	security_release_secctx(&ctx);
185 }
186 #else
ct_show_secctx(struct seq_file * s,const struct nf_conn * ct)187 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
188 {
189 }
190 #endif
191 
192 #ifdef CONFIG_NF_CONNTRACK_ZONES
ct_show_zone(struct seq_file * s,const struct nf_conn * ct,int dir)193 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
194 			 int dir)
195 {
196 	const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
197 
198 	if (zone->dir != dir)
199 		return;
200 	switch (zone->dir) {
201 	case NF_CT_DEFAULT_ZONE_DIR:
202 		seq_printf(s, "zone=%u ", zone->id);
203 		break;
204 	case NF_CT_ZONE_DIR_ORIG:
205 		seq_printf(s, "zone-orig=%u ", zone->id);
206 		break;
207 	case NF_CT_ZONE_DIR_REPL:
208 		seq_printf(s, "zone-reply=%u ", zone->id);
209 		break;
210 	default:
211 		break;
212 	}
213 }
214 #else
ct_show_zone(struct seq_file * s,const struct nf_conn * ct,int dir)215 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
216 				int dir)
217 {
218 }
219 #endif
220 
221 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
ct_show_delta_time(struct seq_file * s,const struct nf_conn * ct)222 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
223 {
224 	struct ct_iter_state *st = s->private;
225 	struct nf_conn_tstamp *tstamp;
226 	s64 delta_time;
227 
228 	tstamp = nf_conn_tstamp_find(ct);
229 	if (tstamp) {
230 		delta_time = st->time_now - tstamp->start;
231 		if (delta_time > 0)
232 			delta_time = div_s64(delta_time, NSEC_PER_SEC);
233 		else
234 			delta_time = 0;
235 
236 		seq_printf(s, "delta-time=%llu ",
237 			   (unsigned long long)delta_time);
238 	}
239 	return;
240 }
241 #else
242 static inline void
ct_show_delta_time(struct seq_file * s,const struct nf_conn * ct)243 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
244 {
245 }
246 #endif
247 
l3proto_name(u16 proto)248 static const char* l3proto_name(u16 proto)
249 {
250 	switch (proto) {
251 	case AF_INET: return "ipv4";
252 	case AF_INET6: return "ipv6";
253 	}
254 
255 	return "unknown";
256 }
257 
l4proto_name(u16 proto)258 static const char* l4proto_name(u16 proto)
259 {
260 	switch (proto) {
261 	case IPPROTO_ICMP: return "icmp";
262 	case IPPROTO_TCP: return "tcp";
263 	case IPPROTO_UDP: return "udp";
264 	case IPPROTO_DCCP: return "dccp";
265 	case IPPROTO_GRE: return "gre";
266 	case IPPROTO_SCTP: return "sctp";
267 	case IPPROTO_UDPLITE: return "udplite";
268 	case IPPROTO_ICMPV6: return "icmpv6";
269 	}
270 
271 	return "unknown";
272 }
273 
274 static void
seq_print_acct(struct seq_file * s,const struct nf_conn * ct,int dir)275 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
276 {
277 	struct nf_conn_acct *acct;
278 	struct nf_conn_counter *counter;
279 
280 	acct = nf_conn_acct_find(ct);
281 	if (!acct)
282 		return;
283 
284 	counter = acct->counter;
285 	seq_printf(s, "packets=%llu bytes=%llu ",
286 		   (unsigned long long)atomic64_read(&counter[dir].packets),
287 		   (unsigned long long)atomic64_read(&counter[dir].bytes));
288 }
289 
290 /* return 0 on success, 1 in case of error */
ct_seq_show(struct seq_file * s,void * v)291 static int ct_seq_show(struct seq_file *s, void *v)
292 {
293 	struct nf_conntrack_tuple_hash *hash = v;
294 	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
295 	const struct nf_conntrack_l4proto *l4proto;
296 	struct net *net = seq_file_net(s);
297 	int ret = 0;
298 
299 	WARN_ON(!ct);
300 	if (unlikely(!refcount_inc_not_zero(&ct->ct_general.use)))
301 		return 0;
302 
303 	/* load ->status after refcount increase */
304 	smp_acquire__after_ctrl_dep();
305 
306 	if (nf_ct_should_gc(ct)) {
307 		nf_ct_kill(ct);
308 		goto release;
309 	}
310 
311 	/* we only want to print DIR_ORIGINAL */
312 	if (NF_CT_DIRECTION(hash))
313 		goto release;
314 
315 	if (!net_eq(nf_ct_net(ct), net))
316 		goto release;
317 
318 	l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
319 
320 	ret = -ENOSPC;
321 	seq_printf(s, "%-8s %u %-8s %u ",
322 		   l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
323 		   l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
324 
325 	if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
326 		seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
327 
328 	if (l4proto->print_conntrack)
329 		l4proto->print_conntrack(s, ct);
330 
331 	print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
332 		    l4proto);
333 
334 	ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
335 
336 	if (seq_has_overflowed(s))
337 		goto release;
338 
339 	seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL);
340 
341 	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
342 		seq_puts(s, "[UNREPLIED] ");
343 
344 	print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, l4proto);
345 
346 	ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
347 
348 	seq_print_acct(s, ct, IP_CT_DIR_REPLY);
349 
350 	if (test_bit(IPS_HW_OFFLOAD_BIT, &ct->status))
351 		seq_puts(s, "[HW_OFFLOAD] ");
352 	else if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
353 		seq_puts(s, "[OFFLOAD] ");
354 	else if (test_bit(IPS_ASSURED_BIT, &ct->status))
355 		seq_puts(s, "[ASSURED] ");
356 
357 	if (seq_has_overflowed(s))
358 		goto release;
359 
360 #if defined(CONFIG_NF_CONNTRACK_MARK)
361 	seq_printf(s, "mark=%u ", READ_ONCE(ct->mark));
362 #endif
363 
364 	ct_show_secctx(s, ct);
365 	ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
366 	ct_show_delta_time(s, ct);
367 
368 	seq_printf(s, "use=%u\n", refcount_read(&ct->ct_general.use));
369 
370 	if (seq_has_overflowed(s))
371 		goto release;
372 
373 	ret = 0;
374 release:
375 	nf_ct_put(ct);
376 	return ret;
377 }
378 
379 static const struct seq_operations ct_seq_ops = {
380 	.start = ct_seq_start,
381 	.next  = ct_seq_next,
382 	.stop  = ct_seq_stop,
383 	.show  = ct_seq_show
384 };
385 
ct_cpu_seq_start(struct seq_file * seq,loff_t * pos)386 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
387 {
388 	struct net *net = seq_file_net(seq);
389 	int cpu;
390 
391 	if (*pos == 0)
392 		return SEQ_START_TOKEN;
393 
394 	for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
395 		if (!cpu_possible(cpu))
396 			continue;
397 		*pos = cpu + 1;
398 		return per_cpu_ptr(net->ct.stat, cpu);
399 	}
400 
401 	return NULL;
402 }
403 
ct_cpu_seq_next(struct seq_file * seq,void * v,loff_t * pos)404 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
405 {
406 	struct net *net = seq_file_net(seq);
407 	int cpu;
408 
409 	for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
410 		if (!cpu_possible(cpu))
411 			continue;
412 		*pos = cpu + 1;
413 		return per_cpu_ptr(net->ct.stat, cpu);
414 	}
415 	(*pos)++;
416 	return NULL;
417 }
418 
ct_cpu_seq_stop(struct seq_file * seq,void * v)419 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
420 {
421 }
422 
ct_cpu_seq_show(struct seq_file * seq,void * v)423 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
424 {
425 	struct net *net = seq_file_net(seq);
426 	const struct ip_conntrack_stat *st = v;
427 	unsigned int nr_conntracks;
428 
429 	if (v == SEQ_START_TOKEN) {
430 		seq_puts(seq, "entries  clashres found new invalid ignore delete chainlength insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
431 		return 0;
432 	}
433 
434 	nr_conntracks = nf_conntrack_count(net);
435 
436 	seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
437 			"%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
438 		   nr_conntracks,
439 		   st->clash_resolve,
440 		   st->found,
441 		   0,
442 		   st->invalid,
443 		   0,
444 		   0,
445 		   st->chaintoolong,
446 		   st->insert,
447 		   st->insert_failed,
448 		   st->drop,
449 		   st->early_drop,
450 		   st->error,
451 
452 		   st->expect_new,
453 		   st->expect_create,
454 		   st->expect_delete,
455 		   st->search_restart
456 		);
457 	return 0;
458 }
459 
460 static const struct seq_operations ct_cpu_seq_ops = {
461 	.start	= ct_cpu_seq_start,
462 	.next	= ct_cpu_seq_next,
463 	.stop	= ct_cpu_seq_stop,
464 	.show	= ct_cpu_seq_show,
465 };
466 
nf_conntrack_standalone_init_proc(struct net * net)467 static int nf_conntrack_standalone_init_proc(struct net *net)
468 {
469 	struct proc_dir_entry *pde;
470 	kuid_t root_uid;
471 	kgid_t root_gid;
472 
473 	pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
474 			sizeof(struct ct_iter_state));
475 	if (!pde)
476 		goto out_nf_conntrack;
477 
478 	root_uid = make_kuid(net->user_ns, 0);
479 	root_gid = make_kgid(net->user_ns, 0);
480 	if (uid_valid(root_uid) && gid_valid(root_gid))
481 		proc_set_user(pde, root_uid, root_gid);
482 
483 	pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
484 			&ct_cpu_seq_ops, sizeof(struct seq_net_private));
485 	if (!pde)
486 		goto out_stat_nf_conntrack;
487 	return 0;
488 
489 out_stat_nf_conntrack:
490 	remove_proc_entry("nf_conntrack", net->proc_net);
491 out_nf_conntrack:
492 	return -ENOMEM;
493 }
494 
nf_conntrack_standalone_fini_proc(struct net * net)495 static void nf_conntrack_standalone_fini_proc(struct net *net)
496 {
497 	remove_proc_entry("nf_conntrack", net->proc_net_stat);
498 	remove_proc_entry("nf_conntrack", net->proc_net);
499 }
500 #else
nf_conntrack_standalone_init_proc(struct net * net)501 static int nf_conntrack_standalone_init_proc(struct net *net)
502 {
503 	return 0;
504 }
505 
nf_conntrack_standalone_fini_proc(struct net * net)506 static void nf_conntrack_standalone_fini_proc(struct net *net)
507 {
508 }
509 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
510 
nf_conntrack_count(const struct net * net)511 u32 nf_conntrack_count(const struct net *net)
512 {
513 	const struct nf_conntrack_net *cnet = nf_ct_pernet(net);
514 
515 	return atomic_read(&cnet->count);
516 }
517 EXPORT_SYMBOL_GPL(nf_conntrack_count);
518 
519 /* Sysctl support */
520 
521 #ifdef CONFIG_SYSCTL
522 /* size the user *wants to set */
523 static unsigned int nf_conntrack_htable_size_user __read_mostly;
524 
525 static int
nf_conntrack_hash_sysctl(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)526 nf_conntrack_hash_sysctl(const struct ctl_table *table, int write,
527 			 void *buffer, size_t *lenp, loff_t *ppos)
528 {
529 	int ret;
530 
531 	/* module_param hashsize could have changed value */
532 	nf_conntrack_htable_size_user = nf_conntrack_htable_size;
533 
534 	ret = proc_dointvec(table, write, buffer, lenp, ppos);
535 	if (ret < 0 || !write)
536 		return ret;
537 
538 	/* update ret, we might not be able to satisfy request */
539 	ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
540 
541 	/* update it to the actual value used by conntrack */
542 	nf_conntrack_htable_size_user = nf_conntrack_htable_size;
543 	return ret;
544 }
545 
546 static struct ctl_table_header *nf_ct_netfilter_header;
547 
548 enum nf_ct_sysctl_index {
549 	NF_SYSCTL_CT_MAX,
550 	NF_SYSCTL_CT_COUNT,
551 	NF_SYSCTL_CT_BUCKETS,
552 	NF_SYSCTL_CT_CHECKSUM,
553 	NF_SYSCTL_CT_LOG_INVALID,
554 	NF_SYSCTL_CT_EXPECT_MAX,
555 	NF_SYSCTL_CT_ACCT,
556 #ifdef CONFIG_NF_CONNTRACK_EVENTS
557 	NF_SYSCTL_CT_EVENTS,
558 #endif
559 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
560 	NF_SYSCTL_CT_TIMESTAMP,
561 #endif
562 	NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC,
563 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_SENT,
564 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_RECV,
565 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ESTABLISHED,
566 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_FIN_WAIT,
567 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE_WAIT,
568 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_LAST_ACK,
569 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_TIME_WAIT,
570 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE,
571 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_RETRANS,
572 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_UNACK,
573 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
574 	NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD,
575 #endif
576 	NF_SYSCTL_CT_PROTO_TCP_LOOSE,
577 	NF_SYSCTL_CT_PROTO_TCP_LIBERAL,
578 	NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST,
579 	NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS,
580 	NF_SYSCTL_CT_PROTO_TIMEOUT_UDP,
581 	NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM,
582 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
583 	NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD,
584 #endif
585 	NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP,
586 	NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6,
587 #ifdef CONFIG_NF_CT_PROTO_SCTP
588 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_CLOSED,
589 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_WAIT,
590 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_ECHOED,
591 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ESTABLISHED,
592 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_SENT,
593 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_RECD,
594 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT,
595 	NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT,
596 #endif
597 #ifdef CONFIG_NF_CT_PROTO_DCCP
598 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST,
599 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_RESPOND,
600 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_PARTOPEN,
601 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_OPEN,
602 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSEREQ,
603 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSING,
604 	NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_TIMEWAIT,
605 	NF_SYSCTL_CT_PROTO_DCCP_LOOSE,
606 #endif
607 #ifdef CONFIG_NF_CT_PROTO_GRE
608 	NF_SYSCTL_CT_PROTO_TIMEOUT_GRE,
609 	NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM,
610 #endif
611 
612 	NF_SYSCTL_CT_LAST_SYSCTL,
613 };
614 
615 static struct ctl_table nf_ct_sysctl_table[] = {
616 	[NF_SYSCTL_CT_MAX] = {
617 		.procname	= "nf_conntrack_max",
618 		.data		= &nf_conntrack_max,
619 		.maxlen		= sizeof(int),
620 		.mode		= 0644,
621 		.proc_handler	= proc_dointvec_minmax,
622 		.extra1		= SYSCTL_ZERO,
623 		.extra2		= SYSCTL_INT_MAX,
624 	},
625 	[NF_SYSCTL_CT_COUNT] = {
626 		.procname	= "nf_conntrack_count",
627 		.maxlen		= sizeof(int),
628 		.mode		= 0444,
629 		.proc_handler	= proc_dointvec,
630 	},
631 	[NF_SYSCTL_CT_BUCKETS] = {
632 		.procname       = "nf_conntrack_buckets",
633 		.data           = &nf_conntrack_htable_size_user,
634 		.maxlen         = sizeof(unsigned int),
635 		.mode           = 0644,
636 		.proc_handler   = nf_conntrack_hash_sysctl,
637 	},
638 	[NF_SYSCTL_CT_CHECKSUM] = {
639 		.procname	= "nf_conntrack_checksum",
640 		.data		= &init_net.ct.sysctl_checksum,
641 		.maxlen		= sizeof(u8),
642 		.mode		= 0644,
643 		.proc_handler	= proc_dou8vec_minmax,
644 		.extra1 	= SYSCTL_ZERO,
645 		.extra2 	= SYSCTL_ONE,
646 	},
647 	[NF_SYSCTL_CT_LOG_INVALID] = {
648 		.procname	= "nf_conntrack_log_invalid",
649 		.data		= &init_net.ct.sysctl_log_invalid,
650 		.maxlen		= sizeof(u8),
651 		.mode		= 0644,
652 		.proc_handler	= proc_dou8vec_minmax,
653 	},
654 	[NF_SYSCTL_CT_EXPECT_MAX] = {
655 		.procname	= "nf_conntrack_expect_max",
656 		.data		= &nf_ct_expect_max,
657 		.maxlen		= sizeof(int),
658 		.mode		= 0644,
659 		.proc_handler	= proc_dointvec_minmax,
660 		.extra1		= SYSCTL_ONE,
661 		.extra2		= SYSCTL_INT_MAX,
662 	},
663 	[NF_SYSCTL_CT_ACCT] = {
664 		.procname	= "nf_conntrack_acct",
665 		.data		= &init_net.ct.sysctl_acct,
666 		.maxlen		= sizeof(u8),
667 		.mode		= 0644,
668 		.proc_handler	= proc_dou8vec_minmax,
669 		.extra1 	= SYSCTL_ZERO,
670 		.extra2 	= SYSCTL_ONE,
671 	},
672 #ifdef CONFIG_NF_CONNTRACK_EVENTS
673 	[NF_SYSCTL_CT_EVENTS] = {
674 		.procname	= "nf_conntrack_events",
675 		.data		= &init_net.ct.sysctl_events,
676 		.maxlen		= sizeof(u8),
677 		.mode		= 0644,
678 		.proc_handler	= proc_dou8vec_minmax,
679 		.extra1 	= SYSCTL_ZERO,
680 		.extra2		= SYSCTL_TWO,
681 	},
682 #endif
683 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
684 	[NF_SYSCTL_CT_TIMESTAMP] = {
685 		.procname	= "nf_conntrack_timestamp",
686 		.data		= &init_net.ct.sysctl_tstamp,
687 		.maxlen		= sizeof(u8),
688 		.mode		= 0644,
689 		.proc_handler	= proc_dou8vec_minmax,
690 		.extra1 	= SYSCTL_ZERO,
691 		.extra2 	= SYSCTL_ONE,
692 	},
693 #endif
694 	[NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC] = {
695 		.procname	= "nf_conntrack_generic_timeout",
696 		.maxlen		= sizeof(unsigned int),
697 		.mode		= 0644,
698 		.proc_handler	= proc_dointvec_jiffies,
699 	},
700 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_SENT] = {
701 		.procname	= "nf_conntrack_tcp_timeout_syn_sent",
702 		.maxlen		= sizeof(unsigned int),
703 		.mode		= 0644,
704 		.proc_handler	= proc_dointvec_jiffies,
705 	},
706 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_RECV] = {
707 		.procname	= "nf_conntrack_tcp_timeout_syn_recv",
708 		.maxlen		= sizeof(unsigned int),
709 		.mode		= 0644,
710 		.proc_handler	= proc_dointvec_jiffies,
711 	},
712 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ESTABLISHED] = {
713 		.procname	= "nf_conntrack_tcp_timeout_established",
714 		.maxlen		= sizeof(unsigned int),
715 		.mode		= 0644,
716 		.proc_handler	= proc_dointvec_jiffies,
717 	},
718 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_FIN_WAIT] = {
719 		.procname	= "nf_conntrack_tcp_timeout_fin_wait",
720 		.maxlen		= sizeof(unsigned int),
721 		.mode		= 0644,
722 		.proc_handler	= proc_dointvec_jiffies,
723 	},
724 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE_WAIT] = {
725 		.procname	= "nf_conntrack_tcp_timeout_close_wait",
726 		.maxlen		= sizeof(unsigned int),
727 		.mode		= 0644,
728 		.proc_handler	= proc_dointvec_jiffies,
729 	},
730 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_LAST_ACK] = {
731 		.procname	= "nf_conntrack_tcp_timeout_last_ack",
732 		.maxlen		= sizeof(unsigned int),
733 		.mode		= 0644,
734 		.proc_handler	= proc_dointvec_jiffies,
735 	},
736 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_TIME_WAIT] = {
737 		.procname	= "nf_conntrack_tcp_timeout_time_wait",
738 		.maxlen		= sizeof(unsigned int),
739 		.mode		= 0644,
740 		.proc_handler	= proc_dointvec_jiffies,
741 	},
742 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE] = {
743 		.procname	= "nf_conntrack_tcp_timeout_close",
744 		.maxlen		= sizeof(unsigned int),
745 		.mode		= 0644,
746 		.proc_handler	= proc_dointvec_jiffies,
747 	},
748 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_RETRANS] = {
749 		.procname	= "nf_conntrack_tcp_timeout_max_retrans",
750 		.maxlen		= sizeof(unsigned int),
751 		.mode		= 0644,
752 		.proc_handler	= proc_dointvec_jiffies,
753 	},
754 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_UNACK] = {
755 		.procname	= "nf_conntrack_tcp_timeout_unacknowledged",
756 		.maxlen		= sizeof(unsigned int),
757 		.mode		= 0644,
758 		.proc_handler	= proc_dointvec_jiffies,
759 	},
760 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
761 	[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD] = {
762 		.procname	= "nf_flowtable_tcp_timeout",
763 		.maxlen		= sizeof(unsigned int),
764 		.mode		= 0644,
765 		.proc_handler	= proc_dointvec_jiffies,
766 	},
767 #endif
768 	[NF_SYSCTL_CT_PROTO_TCP_LOOSE] = {
769 		.procname	= "nf_conntrack_tcp_loose",
770 		.maxlen		= sizeof(u8),
771 		.mode		= 0644,
772 		.proc_handler	= proc_dou8vec_minmax,
773 		.extra1 	= SYSCTL_ZERO,
774 		.extra2 	= SYSCTL_ONE,
775 	},
776 	[NF_SYSCTL_CT_PROTO_TCP_LIBERAL] = {
777 		.procname       = "nf_conntrack_tcp_be_liberal",
778 		.maxlen		= sizeof(u8),
779 		.mode           = 0644,
780 		.proc_handler	= proc_dou8vec_minmax,
781 		.extra1 	= SYSCTL_ZERO,
782 		.extra2 	= SYSCTL_ONE,
783 	},
784 	[NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST] = {
785 		.procname	= "nf_conntrack_tcp_ignore_invalid_rst",
786 		.maxlen		= sizeof(u8),
787 		.mode		= 0644,
788 		.proc_handler	= proc_dou8vec_minmax,
789 		.extra1		= SYSCTL_ZERO,
790 		.extra2		= SYSCTL_ONE,
791 	},
792 	[NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS] = {
793 		.procname	= "nf_conntrack_tcp_max_retrans",
794 		.maxlen		= sizeof(u8),
795 		.mode		= 0644,
796 		.proc_handler	= proc_dou8vec_minmax,
797 	},
798 	[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP] = {
799 		.procname	= "nf_conntrack_udp_timeout",
800 		.maxlen		= sizeof(unsigned int),
801 		.mode		= 0644,
802 		.proc_handler	= proc_dointvec_jiffies,
803 	},
804 	[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM] = {
805 		.procname	= "nf_conntrack_udp_timeout_stream",
806 		.maxlen		= sizeof(unsigned int),
807 		.mode		= 0644,
808 		.proc_handler	= proc_dointvec_jiffies,
809 	},
810 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
811 	[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD] = {
812 		.procname	= "nf_flowtable_udp_timeout",
813 		.maxlen		= sizeof(unsigned int),
814 		.mode		= 0644,
815 		.proc_handler	= proc_dointvec_jiffies,
816 	},
817 #endif
818 	[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP] = {
819 		.procname	= "nf_conntrack_icmp_timeout",
820 		.maxlen		= sizeof(unsigned int),
821 		.mode		= 0644,
822 		.proc_handler	= proc_dointvec_jiffies,
823 	},
824 	[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6] = {
825 		.procname	= "nf_conntrack_icmpv6_timeout",
826 		.maxlen		= sizeof(unsigned int),
827 		.mode		= 0644,
828 		.proc_handler	= proc_dointvec_jiffies,
829 	},
830 #ifdef CONFIG_NF_CT_PROTO_SCTP
831 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_CLOSED] = {
832 		.procname	= "nf_conntrack_sctp_timeout_closed",
833 		.maxlen		= sizeof(unsigned int),
834 		.mode		= 0644,
835 		.proc_handler	= proc_dointvec_jiffies,
836 	},
837 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_WAIT] = {
838 		.procname	= "nf_conntrack_sctp_timeout_cookie_wait",
839 		.maxlen		= sizeof(unsigned int),
840 		.mode		= 0644,
841 		.proc_handler	= proc_dointvec_jiffies,
842 	},
843 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_ECHOED] = {
844 		.procname	= "nf_conntrack_sctp_timeout_cookie_echoed",
845 		.maxlen		= sizeof(unsigned int),
846 		.mode		= 0644,
847 		.proc_handler	= proc_dointvec_jiffies,
848 	},
849 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ESTABLISHED] = {
850 		.procname	= "nf_conntrack_sctp_timeout_established",
851 		.maxlen		= sizeof(unsigned int),
852 		.mode		= 0644,
853 		.proc_handler	= proc_dointvec_jiffies,
854 	},
855 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_SENT] = {
856 		.procname	= "nf_conntrack_sctp_timeout_shutdown_sent",
857 		.maxlen		= sizeof(unsigned int),
858 		.mode		= 0644,
859 		.proc_handler	= proc_dointvec_jiffies,
860 	},
861 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_RECD] = {
862 		.procname	= "nf_conntrack_sctp_timeout_shutdown_recd",
863 		.maxlen		= sizeof(unsigned int),
864 		.mode		= 0644,
865 		.proc_handler	= proc_dointvec_jiffies,
866 	},
867 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = {
868 		.procname	= "nf_conntrack_sctp_timeout_shutdown_ack_sent",
869 		.maxlen		= sizeof(unsigned int),
870 		.mode		= 0644,
871 		.proc_handler	= proc_dointvec_jiffies,
872 	},
873 	[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT] = {
874 		.procname	= "nf_conntrack_sctp_timeout_heartbeat_sent",
875 		.maxlen		= sizeof(unsigned int),
876 		.mode		= 0644,
877 		.proc_handler	= proc_dointvec_jiffies,
878 	},
879 #endif
880 #ifdef CONFIG_NF_CT_PROTO_DCCP
881 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST] = {
882 		.procname	= "nf_conntrack_dccp_timeout_request",
883 		.maxlen		= sizeof(unsigned int),
884 		.mode		= 0644,
885 		.proc_handler	= proc_dointvec_jiffies,
886 	},
887 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_RESPOND] = {
888 		.procname	= "nf_conntrack_dccp_timeout_respond",
889 		.maxlen		= sizeof(unsigned int),
890 		.mode		= 0644,
891 		.proc_handler	= proc_dointvec_jiffies,
892 	},
893 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_PARTOPEN] = {
894 		.procname	= "nf_conntrack_dccp_timeout_partopen",
895 		.maxlen		= sizeof(unsigned int),
896 		.mode		= 0644,
897 		.proc_handler	= proc_dointvec_jiffies,
898 	},
899 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_OPEN] = {
900 		.procname	= "nf_conntrack_dccp_timeout_open",
901 		.maxlen		= sizeof(unsigned int),
902 		.mode		= 0644,
903 		.proc_handler	= proc_dointvec_jiffies,
904 	},
905 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSEREQ] = {
906 		.procname	= "nf_conntrack_dccp_timeout_closereq",
907 		.maxlen		= sizeof(unsigned int),
908 		.mode		= 0644,
909 		.proc_handler	= proc_dointvec_jiffies,
910 	},
911 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSING] = {
912 		.procname	= "nf_conntrack_dccp_timeout_closing",
913 		.maxlen		= sizeof(unsigned int),
914 		.mode		= 0644,
915 		.proc_handler	= proc_dointvec_jiffies,
916 	},
917 	[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_TIMEWAIT] = {
918 		.procname	= "nf_conntrack_dccp_timeout_timewait",
919 		.maxlen		= sizeof(unsigned int),
920 		.mode		= 0644,
921 		.proc_handler	= proc_dointvec_jiffies,
922 	},
923 	[NF_SYSCTL_CT_PROTO_DCCP_LOOSE] = {
924 		.procname	= "nf_conntrack_dccp_loose",
925 		.maxlen		= sizeof(u8),
926 		.mode		= 0644,
927 		.proc_handler	= proc_dou8vec_minmax,
928 		.extra1 	= SYSCTL_ZERO,
929 		.extra2 	= SYSCTL_ONE,
930 	},
931 #endif
932 #ifdef CONFIG_NF_CT_PROTO_GRE
933 	[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE] = {
934 		.procname       = "nf_conntrack_gre_timeout",
935 		.maxlen         = sizeof(unsigned int),
936 		.mode           = 0644,
937 		.proc_handler   = proc_dointvec_jiffies,
938 	},
939 	[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM] = {
940 		.procname       = "nf_conntrack_gre_timeout_stream",
941 		.maxlen         = sizeof(unsigned int),
942 		.mode           = 0644,
943 		.proc_handler   = proc_dointvec_jiffies,
944 	},
945 #endif
946 };
947 
948 static struct ctl_table nf_ct_netfilter_table[] = {
949 	{
950 		.procname	= "nf_conntrack_max",
951 		.data		= &nf_conntrack_max,
952 		.maxlen		= sizeof(int),
953 		.mode		= 0644,
954 		.proc_handler	= proc_dointvec_minmax,
955 		.extra1		= SYSCTL_ZERO,
956 		.extra2		= SYSCTL_INT_MAX,
957 	},
958 };
959 
nf_conntrack_standalone_init_tcp_sysctl(struct net * net,struct ctl_table * table)960 static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net,
961 						    struct ctl_table *table)
962 {
963 	struct nf_tcp_net *tn = nf_tcp_pernet(net);
964 
965 #define XASSIGN(XNAME, tn) \
966 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ ## XNAME].data = \
967 			&(tn)->timeouts[TCP_CONNTRACK_ ## XNAME]
968 
969 	XASSIGN(SYN_SENT, tn);
970 	XASSIGN(SYN_RECV, tn);
971 	XASSIGN(ESTABLISHED, tn);
972 	XASSIGN(FIN_WAIT, tn);
973 	XASSIGN(CLOSE_WAIT, tn);
974 	XASSIGN(LAST_ACK, tn);
975 	XASSIGN(TIME_WAIT, tn);
976 	XASSIGN(CLOSE, tn);
977 	XASSIGN(RETRANS, tn);
978 	XASSIGN(UNACK, tn);
979 #undef XASSIGN
980 #define XASSIGN(XNAME, rval) \
981 	table[NF_SYSCTL_CT_PROTO_TCP_ ## XNAME].data = (rval)
982 
983 	XASSIGN(LOOSE, &tn->tcp_loose);
984 	XASSIGN(LIBERAL, &tn->tcp_be_liberal);
985 	XASSIGN(MAX_RETRANS, &tn->tcp_max_retrans);
986 	XASSIGN(IGNORE_INVALID_RST, &tn->tcp_ignore_invalid_rst);
987 #undef XASSIGN
988 
989 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
990 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD].data = &tn->offload_timeout;
991 #endif
992 
993 }
994 
nf_conntrack_standalone_init_sctp_sysctl(struct net * net,struct ctl_table * table)995 static void nf_conntrack_standalone_init_sctp_sysctl(struct net *net,
996 						     struct ctl_table *table)
997 {
998 #ifdef CONFIG_NF_CT_PROTO_SCTP
999 	struct nf_sctp_net *sn = nf_sctp_pernet(net);
1000 
1001 #define XASSIGN(XNAME, sn) \
1002 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ ## XNAME].data = \
1003 			&(sn)->timeouts[SCTP_CONNTRACK_ ## XNAME]
1004 
1005 	XASSIGN(CLOSED, sn);
1006 	XASSIGN(COOKIE_WAIT, sn);
1007 	XASSIGN(COOKIE_ECHOED, sn);
1008 	XASSIGN(ESTABLISHED, sn);
1009 	XASSIGN(SHUTDOWN_SENT, sn);
1010 	XASSIGN(SHUTDOWN_RECD, sn);
1011 	XASSIGN(SHUTDOWN_ACK_SENT, sn);
1012 	XASSIGN(HEARTBEAT_SENT, sn);
1013 #undef XASSIGN
1014 #endif
1015 }
1016 
nf_conntrack_standalone_init_dccp_sysctl(struct net * net,struct ctl_table * table)1017 static void nf_conntrack_standalone_init_dccp_sysctl(struct net *net,
1018 						     struct ctl_table *table)
1019 {
1020 #ifdef CONFIG_NF_CT_PROTO_DCCP
1021 	struct nf_dccp_net *dn = nf_dccp_pernet(net);
1022 
1023 #define XASSIGN(XNAME, dn) \
1024 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_ ## XNAME].data = \
1025 			&(dn)->dccp_timeout[CT_DCCP_ ## XNAME]
1026 
1027 	XASSIGN(REQUEST, dn);
1028 	XASSIGN(RESPOND, dn);
1029 	XASSIGN(PARTOPEN, dn);
1030 	XASSIGN(OPEN, dn);
1031 	XASSIGN(CLOSEREQ, dn);
1032 	XASSIGN(CLOSING, dn);
1033 	XASSIGN(TIMEWAIT, dn);
1034 #undef XASSIGN
1035 
1036 	table[NF_SYSCTL_CT_PROTO_DCCP_LOOSE].data = &dn->dccp_loose;
1037 #endif
1038 }
1039 
nf_conntrack_standalone_init_gre_sysctl(struct net * net,struct ctl_table * table)1040 static void nf_conntrack_standalone_init_gre_sysctl(struct net *net,
1041 						    struct ctl_table *table)
1042 {
1043 #ifdef CONFIG_NF_CT_PROTO_GRE
1044 	struct nf_gre_net *gn = nf_gre_pernet(net);
1045 
1046 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE].data = &gn->timeouts[GRE_CT_UNREPLIED];
1047 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM].data = &gn->timeouts[GRE_CT_REPLIED];
1048 #endif
1049 }
1050 
nf_conntrack_standalone_init_sysctl(struct net * net)1051 static int nf_conntrack_standalone_init_sysctl(struct net *net)
1052 {
1053 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
1054 	struct nf_udp_net *un = nf_udp_pernet(net);
1055 	struct ctl_table *table;
1056 
1057 	BUILD_BUG_ON(ARRAY_SIZE(nf_ct_sysctl_table) != NF_SYSCTL_CT_LAST_SYSCTL);
1058 
1059 	table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
1060 			GFP_KERNEL);
1061 	if (!table)
1062 		return -ENOMEM;
1063 
1064 	table[NF_SYSCTL_CT_COUNT].data = &cnet->count;
1065 	table[NF_SYSCTL_CT_CHECKSUM].data = &net->ct.sysctl_checksum;
1066 	table[NF_SYSCTL_CT_LOG_INVALID].data = &net->ct.sysctl_log_invalid;
1067 	table[NF_SYSCTL_CT_ACCT].data = &net->ct.sysctl_acct;
1068 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1069 	table[NF_SYSCTL_CT_EVENTS].data = &net->ct.sysctl_events;
1070 #endif
1071 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
1072 	table[NF_SYSCTL_CT_TIMESTAMP].data = &net->ct.sysctl_tstamp;
1073 #endif
1074 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC].data = &nf_generic_pernet(net)->timeout;
1075 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP].data = &nf_icmp_pernet(net)->timeout;
1076 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6].data = &nf_icmpv6_pernet(net)->timeout;
1077 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP].data = &un->timeouts[UDP_CT_UNREPLIED];
1078 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM].data = &un->timeouts[UDP_CT_REPLIED];
1079 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
1080 	table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD].data = &un->offload_timeout;
1081 #endif
1082 
1083 	nf_conntrack_standalone_init_tcp_sysctl(net, table);
1084 	nf_conntrack_standalone_init_sctp_sysctl(net, table);
1085 	nf_conntrack_standalone_init_dccp_sysctl(net, table);
1086 	nf_conntrack_standalone_init_gre_sysctl(net, table);
1087 
1088 	/* Don't allow non-init_net ns to alter global sysctls */
1089 	if (!net_eq(&init_net, net)) {
1090 		table[NF_SYSCTL_CT_MAX].mode = 0444;
1091 		table[NF_SYSCTL_CT_EXPECT_MAX].mode = 0444;
1092 		table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
1093 	}
1094 
1095 	cnet->sysctl_header = register_net_sysctl_sz(net, "net/netfilter",
1096 						     table,
1097 						     ARRAY_SIZE(nf_ct_sysctl_table));
1098 	if (!cnet->sysctl_header)
1099 		goto out_unregister_netfilter;
1100 
1101 	return 0;
1102 
1103 out_unregister_netfilter:
1104 	kfree(table);
1105 	return -ENOMEM;
1106 }
1107 
nf_conntrack_standalone_fini_sysctl(struct net * net)1108 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
1109 {
1110 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
1111 	const struct ctl_table *table;
1112 
1113 	table = cnet->sysctl_header->ctl_table_arg;
1114 	unregister_net_sysctl_table(cnet->sysctl_header);
1115 	kfree(table);
1116 }
1117 #else
nf_conntrack_standalone_init_sysctl(struct net * net)1118 static int nf_conntrack_standalone_init_sysctl(struct net *net)
1119 {
1120 	return 0;
1121 }
1122 
nf_conntrack_standalone_fini_sysctl(struct net * net)1123 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
1124 {
1125 }
1126 #endif /* CONFIG_SYSCTL */
1127 
nf_conntrack_fini_net(struct net * net)1128 static void nf_conntrack_fini_net(struct net *net)
1129 {
1130 	if (enable_hooks)
1131 		nf_ct_netns_put(net, NFPROTO_INET);
1132 
1133 	nf_conntrack_standalone_fini_proc(net);
1134 	nf_conntrack_standalone_fini_sysctl(net);
1135 }
1136 
nf_conntrack_pernet_init(struct net * net)1137 static int nf_conntrack_pernet_init(struct net *net)
1138 {
1139 	int ret;
1140 
1141 	net->ct.sysctl_checksum = 1;
1142 
1143 	ret = nf_conntrack_standalone_init_sysctl(net);
1144 	if (ret < 0)
1145 		return ret;
1146 
1147 	ret = nf_conntrack_standalone_init_proc(net);
1148 	if (ret < 0)
1149 		goto out_proc;
1150 
1151 	ret = nf_conntrack_init_net(net);
1152 	if (ret < 0)
1153 		goto out_init_net;
1154 
1155 	if (enable_hooks) {
1156 		ret = nf_ct_netns_get(net, NFPROTO_INET);
1157 		if (ret < 0)
1158 			goto out_hooks;
1159 	}
1160 
1161 	return 0;
1162 
1163 out_hooks:
1164 	nf_conntrack_cleanup_net(net);
1165 out_init_net:
1166 	nf_conntrack_standalone_fini_proc(net);
1167 out_proc:
1168 	nf_conntrack_standalone_fini_sysctl(net);
1169 	return ret;
1170 }
1171 
nf_conntrack_pernet_exit(struct list_head * net_exit_list)1172 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
1173 {
1174 	struct net *net;
1175 
1176 	list_for_each_entry(net, net_exit_list, exit_list)
1177 		nf_conntrack_fini_net(net);
1178 
1179 	nf_conntrack_cleanup_net_list(net_exit_list);
1180 }
1181 
1182 static struct pernet_operations nf_conntrack_net_ops = {
1183 	.init		= nf_conntrack_pernet_init,
1184 	.exit_batch	= nf_conntrack_pernet_exit,
1185 	.id		= &nf_conntrack_net_id,
1186 	.size = sizeof(struct nf_conntrack_net),
1187 };
1188 
nf_conntrack_standalone_init(void)1189 static int __init nf_conntrack_standalone_init(void)
1190 {
1191 	int ret = nf_conntrack_init_start();
1192 	if (ret < 0)
1193 		goto out_start;
1194 
1195 	BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
1196 
1197 #ifdef CONFIG_SYSCTL
1198 	nf_ct_netfilter_header =
1199 		register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
1200 	if (!nf_ct_netfilter_header) {
1201 		pr_err("nf_conntrack: can't register to sysctl.\n");
1202 		ret = -ENOMEM;
1203 		goto out_sysctl;
1204 	}
1205 
1206 	nf_conntrack_htable_size_user = nf_conntrack_htable_size;
1207 #endif
1208 
1209 	nf_conntrack_init_end();
1210 
1211 	ret = register_pernet_subsys(&nf_conntrack_net_ops);
1212 	if (ret < 0)
1213 		goto out_pernet;
1214 
1215 	return 0;
1216 
1217 out_pernet:
1218 #ifdef CONFIG_SYSCTL
1219 	unregister_net_sysctl_table(nf_ct_netfilter_header);
1220 out_sysctl:
1221 #endif
1222 	nf_conntrack_cleanup_end();
1223 out_start:
1224 	return ret;
1225 }
1226 
nf_conntrack_standalone_fini(void)1227 static void __exit nf_conntrack_standalone_fini(void)
1228 {
1229 	nf_conntrack_cleanup_start();
1230 	unregister_pernet_subsys(&nf_conntrack_net_ops);
1231 #ifdef CONFIG_SYSCTL
1232 	unregister_net_sysctl_table(nf_ct_netfilter_header);
1233 #endif
1234 	nf_conntrack_cleanup_end();
1235 }
1236 
1237 module_init(nf_conntrack_standalone_init);
1238 module_exit(nf_conntrack_standalone_fini);
1239