xref: /linux/net/netfilter/nf_conntrack_proto.c (revision 44f57d78) 
1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/types.h>
4 #include <linux/netfilter.h>
5 #include <linux/module.h>
6 #include <linux/slab.h>
7 #include <linux/mutex.h>
8 #include <linux/vmalloc.h>
9 #include <linux/stddef.h>
10 #include <linux/err.h>
11 #include <linux/percpu.h>
12 #include <linux/notifier.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 
16 #include <net/netfilter/nf_conntrack.h>
17 #include <net/netfilter/nf_conntrack_l4proto.h>
18 #include <net/netfilter/nf_conntrack_core.h>
19 #include <net/netfilter/nf_log.h>
20 
21 #include <linux/ip.h>
22 #include <linux/icmp.h>
23 #include <linux/sysctl.h>
24 #include <net/route.h>
25 #include <net/ip.h>
26 
27 #include <linux/netfilter_ipv4.h>
28 #include <linux/netfilter_ipv6.h>
29 #include <linux/netfilter_ipv6/ip6_tables.h>
30 #include <net/netfilter/nf_conntrack_helper.h>
31 #include <net/netfilter/nf_conntrack_zones.h>
32 #include <net/netfilter/nf_conntrack_seqadj.h>
33 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
34 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
35 #include <net/netfilter/nf_nat_helper.h>
36 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
37 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
38 
39 #include <linux/ipv6.h>
40 #include <linux/in6.h>
41 #include <net/ipv6.h>
42 #include <net/inet_frag.h>
43 
44 extern unsigned int nf_conntrack_net_id;
45 
46 static DEFINE_MUTEX(nf_ct_proto_mutex);
47 
48 #ifdef CONFIG_SYSCTL
49 __printf(5, 6)
50 void nf_l4proto_log_invalid(const struct sk_buff *skb,
51 			    struct net *net,
52 			    u16 pf, u8 protonum,
53 			    const char *fmt, ...)
54 {
55 	struct va_format vaf;
56 	va_list args;
57 
58 	if (net->ct.sysctl_log_invalid != protonum &&
59 	    net->ct.sysctl_log_invalid != IPPROTO_RAW)
60 		return;
61 
62 	va_start(args, fmt);
63 	vaf.fmt = fmt;
64 	vaf.va = &args;
65 
66 	nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
67 		      "nf_ct_proto_%d: %pV ", protonum, &vaf);
68 	va_end(args);
69 }
70 EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
71 
72 __printf(3, 4)
73 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
74 			       const struct nf_conn *ct,
75 			       const char *fmt, ...)
76 {
77 	struct va_format vaf;
78 	struct net *net;
79 	va_list args;
80 
81 	net = nf_ct_net(ct);
82 	if (likely(net->ct.sysctl_log_invalid == 0))
83 		return;
84 
85 	va_start(args, fmt);
86 	vaf.fmt = fmt;
87 	vaf.va = &args;
88 
89 	nf_l4proto_log_invalid(skb, net, nf_ct_l3num(ct),
90 			       nf_ct_protonum(ct), "%pV", &vaf);
91 	va_end(args);
92 }
93 EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
94 #endif
95 
96 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
97 {
98 	switch (l4proto) {
99 	case IPPROTO_UDP: return &nf_conntrack_l4proto_udp;
100 	case IPPROTO_TCP: return &nf_conntrack_l4proto_tcp;
101 	case IPPROTO_ICMP: return &nf_conntrack_l4proto_icmp;
102 #ifdef CONFIG_NF_CT_PROTO_DCCP
103 	case IPPROTO_DCCP: return &nf_conntrack_l4proto_dccp;
104 #endif
105 #ifdef CONFIG_NF_CT_PROTO_SCTP
106 	case IPPROTO_SCTP: return &nf_conntrack_l4proto_sctp;
107 #endif
108 #ifdef CONFIG_NF_CT_PROTO_UDPLITE
109 	case IPPROTO_UDPLITE: return &nf_conntrack_l4proto_udplite;
110 #endif
111 #ifdef CONFIG_NF_CT_PROTO_GRE
112 	case IPPROTO_GRE: return &nf_conntrack_l4proto_gre;
113 #endif
114 #if IS_ENABLED(CONFIG_IPV6)
115 	case IPPROTO_ICMPV6: return &nf_conntrack_l4proto_icmpv6;
116 #endif /* CONFIG_IPV6 */
117 	}
118 
119 	return &nf_conntrack_l4proto_generic;
120 };
121 EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
122 
123 static unsigned int nf_confirm(struct sk_buff *skb,
124 			       unsigned int protoff,
125 			       struct nf_conn *ct,
126 			       enum ip_conntrack_info ctinfo)
127 {
128 	const struct nf_conn_help *help;
129 
130 	help = nfct_help(ct);
131 	if (help) {
132 		const struct nf_conntrack_helper *helper;
133 		int ret;
134 
135 		/* rcu_read_lock()ed by nf_hook_thresh */
136 		helper = rcu_dereference(help->helper);
137 		if (helper) {
138 			ret = helper->help(skb,
139 					   protoff,
140 					   ct, ctinfo);
141 			if (ret != NF_ACCEPT)
142 				return ret;
143 		}
144 	}
145 
146 	if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
147 	    !nf_is_loopback_packet(skb)) {
148 		if (!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
149 			NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
150 			return NF_DROP;
151 		}
152 	}
153 
154 	/* We've seen it coming out the other side: confirm it */
155 	return nf_conntrack_confirm(skb);
156 }
157 
158 static unsigned int ipv4_confirm(void *priv,
159 				 struct sk_buff *skb,
160 				 const struct nf_hook_state *state)
161 {
162 	enum ip_conntrack_info ctinfo;
163 	struct nf_conn *ct;
164 
165 	ct = nf_ct_get(skb, &ctinfo);
166 	if (!ct || ctinfo == IP_CT_RELATED_REPLY)
167 		return nf_conntrack_confirm(skb);
168 
169 	return nf_confirm(skb,
170 			  skb_network_offset(skb) + ip_hdrlen(skb),
171 			  ct, ctinfo);
172 }
173 
174 static unsigned int ipv4_conntrack_in(void *priv,
175 				      struct sk_buff *skb,
176 				      const struct nf_hook_state *state)
177 {
178 	return nf_conntrack_in(skb, state);
179 }
180 
181 static unsigned int ipv4_conntrack_local(void *priv,
182 					 struct sk_buff *skb,
183 					 const struct nf_hook_state *state)
184 {
185 	if (ip_is_fragment(ip_hdr(skb))) { /* IP_NODEFRAG setsockopt set */
186 		enum ip_conntrack_info ctinfo;
187 		struct nf_conn *tmpl;
188 
189 		tmpl = nf_ct_get(skb, &ctinfo);
190 		if (tmpl && nf_ct_is_template(tmpl)) {
191 			/* when skipping ct, clear templates to avoid fooling
192 			 * later targets/matches
193 			 */
194 			skb->_nfct = 0;
195 			nf_ct_put(tmpl);
196 		}
197 		return NF_ACCEPT;
198 	}
199 
200 	return nf_conntrack_in(skb, state);
201 }
202 
203 /* Connection tracking may drop packets, but never alters them, so
204  * make it the first hook.
205  */
206 static const struct nf_hook_ops ipv4_conntrack_ops[] = {
207 	{
208 		.hook		= ipv4_conntrack_in,
209 		.pf		= NFPROTO_IPV4,
210 		.hooknum	= NF_INET_PRE_ROUTING,
211 		.priority	= NF_IP_PRI_CONNTRACK,
212 	},
213 	{
214 		.hook		= ipv4_conntrack_local,
215 		.pf		= NFPROTO_IPV4,
216 		.hooknum	= NF_INET_LOCAL_OUT,
217 		.priority	= NF_IP_PRI_CONNTRACK,
218 	},
219 	{
220 		.hook		= ipv4_confirm,
221 		.pf		= NFPROTO_IPV4,
222 		.hooknum	= NF_INET_POST_ROUTING,
223 		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM,
224 	},
225 	{
226 		.hook		= ipv4_confirm,
227 		.pf		= NFPROTO_IPV4,
228 		.hooknum	= NF_INET_LOCAL_IN,
229 		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM,
230 	},
231 };
232 
233 /* Fast function for those who don't want to parse /proc (and I don't
234  * blame them).
235  * Reversing the socket's dst/src point of view gives us the reply
236  * mapping.
237  */
238 static int
239 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
240 {
241 	const struct inet_sock *inet = inet_sk(sk);
242 	const struct nf_conntrack_tuple_hash *h;
243 	struct nf_conntrack_tuple tuple;
244 
245 	memset(&tuple, 0, sizeof(tuple));
246 
247 	lock_sock(sk);
248 	tuple.src.u3.ip = inet->inet_rcv_saddr;
249 	tuple.src.u.tcp.port = inet->inet_sport;
250 	tuple.dst.u3.ip = inet->inet_daddr;
251 	tuple.dst.u.tcp.port = inet->inet_dport;
252 	tuple.src.l3num = PF_INET;
253 	tuple.dst.protonum = sk->sk_protocol;
254 	release_sock(sk);
255 
256 	/* We only do TCP and SCTP at the moment: is there a better way? */
257 	if (tuple.dst.protonum != IPPROTO_TCP &&
258 	    tuple.dst.protonum != IPPROTO_SCTP) {
259 		pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n");
260 		return -ENOPROTOOPT;
261 	}
262 
263 	if ((unsigned int)*len < sizeof(struct sockaddr_in)) {
264 		pr_debug("SO_ORIGINAL_DST: len %d not %zu\n",
265 			 *len, sizeof(struct sockaddr_in));
266 		return -EINVAL;
267 	}
268 
269 	h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
270 	if (h) {
271 		struct sockaddr_in sin;
272 		struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
273 
274 		sin.sin_family = AF_INET;
275 		sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
276 			.tuple.dst.u.tcp.port;
277 		sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
278 			.tuple.dst.u3.ip;
279 		memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
280 
281 		pr_debug("SO_ORIGINAL_DST: %pI4 %u\n",
282 			 &sin.sin_addr.s_addr, ntohs(sin.sin_port));
283 		nf_ct_put(ct);
284 		if (copy_to_user(user, &sin, sizeof(sin)) != 0)
285 			return -EFAULT;
286 		else
287 			return 0;
288 	}
289 	pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n",
290 		 &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port),
291 		 &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port));
292 	return -ENOENT;
293 }
294 
295 static struct nf_sockopt_ops so_getorigdst = {
296 	.pf		= PF_INET,
297 	.get_optmin	= SO_ORIGINAL_DST,
298 	.get_optmax	= SO_ORIGINAL_DST + 1,
299 	.get		= getorigdst,
300 	.owner		= THIS_MODULE,
301 };
302 
303 #if IS_ENABLED(CONFIG_IPV6)
304 static int
305 ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
306 {
307 	struct nf_conntrack_tuple tuple = { .src.l3num = NFPROTO_IPV6 };
308 	const struct ipv6_pinfo *inet6 = inet6_sk(sk);
309 	const struct inet_sock *inet = inet_sk(sk);
310 	const struct nf_conntrack_tuple_hash *h;
311 	struct sockaddr_in6 sin6;
312 	struct nf_conn *ct;
313 	__be32 flow_label;
314 	int bound_dev_if;
315 
316 	lock_sock(sk);
317 	tuple.src.u3.in6 = sk->sk_v6_rcv_saddr;
318 	tuple.src.u.tcp.port = inet->inet_sport;
319 	tuple.dst.u3.in6 = sk->sk_v6_daddr;
320 	tuple.dst.u.tcp.port = inet->inet_dport;
321 	tuple.dst.protonum = sk->sk_protocol;
322 	bound_dev_if = sk->sk_bound_dev_if;
323 	flow_label = inet6->flow_label;
324 	release_sock(sk);
325 
326 	if (tuple.dst.protonum != IPPROTO_TCP &&
327 	    tuple.dst.protonum != IPPROTO_SCTP)
328 		return -ENOPROTOOPT;
329 
330 	if (*len < 0 || (unsigned int)*len < sizeof(sin6))
331 		return -EINVAL;
332 
333 	h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
334 	if (!h) {
335 		pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
336 			 &tuple.src.u3.ip6, ntohs(tuple.src.u.tcp.port),
337 			 &tuple.dst.u3.ip6, ntohs(tuple.dst.u.tcp.port));
338 		return -ENOENT;
339 	}
340 
341 	ct = nf_ct_tuplehash_to_ctrack(h);
342 
343 	sin6.sin6_family = AF_INET6;
344 	sin6.sin6_port = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.tcp.port;
345 	sin6.sin6_flowinfo = flow_label & IPV6_FLOWINFO_MASK;
346 	memcpy(&sin6.sin6_addr,
347 	       &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
348 	       sizeof(sin6.sin6_addr));
349 
350 	nf_ct_put(ct);
351 	sin6.sin6_scope_id = ipv6_iface_scope_id(&sin6.sin6_addr, bound_dev_if);
352 	return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
353 }
354 
355 static struct nf_sockopt_ops so_getorigdst6 = {
356 	.pf		= NFPROTO_IPV6,
357 	.get_optmin	= IP6T_SO_ORIGINAL_DST,
358 	.get_optmax	= IP6T_SO_ORIGINAL_DST + 1,
359 	.get		= ipv6_getorigdst,
360 	.owner		= THIS_MODULE,
361 };
362 
363 static unsigned int ipv6_confirm(void *priv,
364 				 struct sk_buff *skb,
365 				 const struct nf_hook_state *state)
366 {
367 	struct nf_conn *ct;
368 	enum ip_conntrack_info ctinfo;
369 	unsigned char pnum = ipv6_hdr(skb)->nexthdr;
370 	__be16 frag_off;
371 	int protoff;
372 
373 	ct = nf_ct_get(skb, &ctinfo);
374 	if (!ct || ctinfo == IP_CT_RELATED_REPLY)
375 		return nf_conntrack_confirm(skb);
376 
377 	protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
378 				   &frag_off);
379 	if (protoff < 0 || (frag_off & htons(~0x7)) != 0) {
380 		pr_debug("proto header not found\n");
381 		return nf_conntrack_confirm(skb);
382 	}
383 
384 	return nf_confirm(skb, protoff, ct, ctinfo);
385 }
386 
387 static unsigned int ipv6_conntrack_in(void *priv,
388 				      struct sk_buff *skb,
389 				      const struct nf_hook_state *state)
390 {
391 	return nf_conntrack_in(skb, state);
392 }
393 
394 static unsigned int ipv6_conntrack_local(void *priv,
395 					 struct sk_buff *skb,
396 					 const struct nf_hook_state *state)
397 {
398 	return nf_conntrack_in(skb, state);
399 }
400 
401 static const struct nf_hook_ops ipv6_conntrack_ops[] = {
402 	{
403 		.hook		= ipv6_conntrack_in,
404 		.pf		= NFPROTO_IPV6,
405 		.hooknum	= NF_INET_PRE_ROUTING,
406 		.priority	= NF_IP6_PRI_CONNTRACK,
407 	},
408 	{
409 		.hook		= ipv6_conntrack_local,
410 		.pf		= NFPROTO_IPV6,
411 		.hooknum	= NF_INET_LOCAL_OUT,
412 		.priority	= NF_IP6_PRI_CONNTRACK,
413 	},
414 	{
415 		.hook		= ipv6_confirm,
416 		.pf		= NFPROTO_IPV6,
417 		.hooknum	= NF_INET_POST_ROUTING,
418 		.priority	= NF_IP6_PRI_LAST,
419 	},
420 	{
421 		.hook		= ipv6_confirm,
422 		.pf		= NFPROTO_IPV6,
423 		.hooknum	= NF_INET_LOCAL_IN,
424 		.priority	= NF_IP6_PRI_LAST - 1,
425 	},
426 };
427 #endif
428 
429 static int nf_ct_tcp_fixup(struct nf_conn *ct, void *_nfproto)
430 {
431 	u8 nfproto = (unsigned long)_nfproto;
432 
433 	if (nf_ct_l3num(ct) != nfproto)
434 		return 0;
435 
436 	if (nf_ct_protonum(ct) == IPPROTO_TCP &&
437 	    ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED) {
438 		ct->proto.tcp.seen[0].td_maxwin = 0;
439 		ct->proto.tcp.seen[1].td_maxwin = 0;
440 	}
441 
442 	return 0;
443 }
444 
445 static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
446 {
447 	struct nf_conntrack_net *cnet = net_generic(net, nf_conntrack_net_id);
448 	bool fixup_needed = false;
449 	int err = 0;
450 
451 	mutex_lock(&nf_ct_proto_mutex);
452 
453 	switch (nfproto) {
454 	case NFPROTO_IPV4:
455 		cnet->users4++;
456 		if (cnet->users4 > 1)
457 			goto out_unlock;
458 		err = nf_defrag_ipv4_enable(net);
459 		if (err) {
460 			cnet->users4 = 0;
461 			goto out_unlock;
462 		}
463 
464 		err = nf_register_net_hooks(net, ipv4_conntrack_ops,
465 					    ARRAY_SIZE(ipv4_conntrack_ops));
466 		if (err)
467 			cnet->users4 = 0;
468 		else
469 			fixup_needed = true;
470 		break;
471 #if IS_ENABLED(CONFIG_IPV6)
472 	case NFPROTO_IPV6:
473 		cnet->users6++;
474 		if (cnet->users6 > 1)
475 			goto out_unlock;
476 		err = nf_defrag_ipv6_enable(net);
477 		if (err < 0) {
478 			cnet->users6 = 0;
479 			goto out_unlock;
480 		}
481 
482 		err = nf_register_net_hooks(net, ipv6_conntrack_ops,
483 					    ARRAY_SIZE(ipv6_conntrack_ops));
484 		if (err)
485 			cnet->users6 = 0;
486 		else
487 			fixup_needed = true;
488 		break;
489 #endif
490 	default:
491 		err = -EPROTO;
492 		break;
493 	}
494  out_unlock:
495 	mutex_unlock(&nf_ct_proto_mutex);
496 
497 	if (fixup_needed)
498 		nf_ct_iterate_cleanup_net(net, nf_ct_tcp_fixup,
499 					  (void *)(unsigned long)nfproto, 0, 0);
500 
501 	return err;
502 }
503 
504 static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
505 {
506 	struct nf_conntrack_net *cnet = net_generic(net, nf_conntrack_net_id);
507 
508 	mutex_lock(&nf_ct_proto_mutex);
509 	switch (nfproto) {
510 	case NFPROTO_IPV4:
511 		if (cnet->users4 && (--cnet->users4 == 0))
512 			nf_unregister_net_hooks(net, ipv4_conntrack_ops,
513 						ARRAY_SIZE(ipv4_conntrack_ops));
514 		break;
515 #if IS_ENABLED(CONFIG_IPV6)
516 	case NFPROTO_IPV6:
517 		if (cnet->users6 && (--cnet->users6 == 0))
518 			nf_unregister_net_hooks(net, ipv6_conntrack_ops,
519 						ARRAY_SIZE(ipv6_conntrack_ops));
520 		break;
521 #endif
522 	}
523 
524 	mutex_unlock(&nf_ct_proto_mutex);
525 }
526 
527 int nf_ct_netns_get(struct net *net, u8 nfproto)
528 {
529 	int err;
530 
531 	if (nfproto == NFPROTO_INET) {
532 		err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
533 		if (err < 0)
534 			goto err1;
535 		err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
536 		if (err < 0)
537 			goto err2;
538 	} else {
539 		err = nf_ct_netns_do_get(net, nfproto);
540 		if (err < 0)
541 			goto err1;
542 	}
543 	return 0;
544 
545 err2:
546 	nf_ct_netns_put(net, NFPROTO_IPV4);
547 err1:
548 	return err;
549 }
550 EXPORT_SYMBOL_GPL(nf_ct_netns_get);
551 
552 void nf_ct_netns_put(struct net *net, uint8_t nfproto)
553 {
554 	if (nfproto == NFPROTO_INET) {
555 		nf_ct_netns_do_put(net, NFPROTO_IPV4);
556 		nf_ct_netns_do_put(net, NFPROTO_IPV6);
557 	} else {
558 		nf_ct_netns_do_put(net, nfproto);
559 	}
560 }
561 EXPORT_SYMBOL_GPL(nf_ct_netns_put);
562 
563 int nf_conntrack_proto_init(void)
564 {
565 	int ret;
566 
567 	ret = nf_register_sockopt(&so_getorigdst);
568 	if (ret < 0)
569 		return ret;
570 
571 #if IS_ENABLED(CONFIG_IPV6)
572 	ret = nf_register_sockopt(&so_getorigdst6);
573 	if (ret < 0)
574 		goto cleanup_sockopt;
575 #endif
576 
577 	return ret;
578 
579 #if IS_ENABLED(CONFIG_IPV6)
580 cleanup_sockopt:
581 	nf_unregister_sockopt(&so_getorigdst6);
582 #endif
583 	return ret;
584 }
585 
586 void nf_conntrack_proto_fini(void)
587 {
588 	nf_unregister_sockopt(&so_getorigdst);
589 #if IS_ENABLED(CONFIG_IPV6)
590 	nf_unregister_sockopt(&so_getorigdst6);
591 #endif
592 }
593 
594 void nf_conntrack_proto_pernet_init(struct net *net)
595 {
596 	nf_conntrack_generic_init_net(net);
597 	nf_conntrack_udp_init_net(net);
598 	nf_conntrack_tcp_init_net(net);
599 	nf_conntrack_icmp_init_net(net);
600 #if IS_ENABLED(CONFIG_IPV6)
601 	nf_conntrack_icmpv6_init_net(net);
602 #endif
603 #ifdef CONFIG_NF_CT_PROTO_DCCP
604 	nf_conntrack_dccp_init_net(net);
605 #endif
606 #ifdef CONFIG_NF_CT_PROTO_SCTP
607 	nf_conntrack_sctp_init_net(net);
608 #endif
609 #ifdef CONFIG_NF_CT_PROTO_GRE
610 	nf_conntrack_gre_init_net(net);
611 #endif
612 }
613 
614 void nf_conntrack_proto_pernet_fini(struct net *net)
615 {
616 #ifdef CONFIG_NF_CT_PROTO_GRE
617 	nf_ct_gre_keymap_flush(net);
618 #endif
619 }
620 
621 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
622 		  &nf_conntrack_htable_size, 0600);
623 
624 MODULE_ALIAS("ip_conntrack");
625 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
626 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
627 MODULE_LICENSE("GPL");
628