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_conntrack_bridge.h>
20 #include <net/netfilter/nf_log.h>
21
22 #include <linux/ip.h>
23 #include <linux/icmp.h>
24 #include <linux/sysctl.h>
25 #include <net/route.h>
26 #include <net/ip.h>
27
28 #include <linux/netfilter_ipv4.h>
29 #include <linux/netfilter_ipv6.h>
30 #include <linux/netfilter_ipv6/ip6_tables.h>
31 #include <net/netfilter/nf_conntrack_helper.h>
32 #include <net/netfilter/nf_conntrack_zones.h>
33 #include <net/netfilter/nf_conntrack_seqadj.h>
34 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
35 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
36 #include <net/netfilter/nf_nat_helper.h>
37 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
38 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
39
40 #include <linux/ipv6.h>
41 #include <linux/in6.h>
42 #include <net/ipv6.h>
43 #include <net/inet_frag.h>
44
45 static DEFINE_MUTEX(nf_ct_proto_mutex);
46
47 #ifdef CONFIG_SYSCTL
48 __printf(4, 5)
nf_l4proto_log_invalid(const struct sk_buff * skb,const struct nf_hook_state * state,u8 protonum,const char * fmt,...)49 void nf_l4proto_log_invalid(const struct sk_buff *skb,
50 const struct nf_hook_state *state,
51 u8 protonum,
52 const char *fmt, ...)
53 {
54 struct net *net = state->net;
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, state->pf, 0, skb, state->in, state->out,
67 NULL, "nf_ct_proto_%d: %pV ", protonum, &vaf);
68 va_end(args);
69 }
70 EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
71
72 __printf(4, 5)
nf_ct_l4proto_log_invalid(const struct sk_buff * skb,const struct nf_conn * ct,const struct nf_hook_state * state,const char * fmt,...)73 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
74 const struct nf_conn *ct,
75 const struct nf_hook_state *state,
76 const char *fmt, ...)
77 {
78 struct va_format vaf;
79 struct net *net;
80 va_list args;
81
82 net = nf_ct_net(ct);
83 if (likely(net->ct.sysctl_log_invalid == 0))
84 return;
85
86 va_start(args, fmt);
87 vaf.fmt = fmt;
88 vaf.va = &args;
89
90 nf_l4proto_log_invalid(skb, state,
91 nf_ct_protonum(ct), "%pV", &vaf);
92 va_end(args);
93 }
94 EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
95 #endif
96
nf_ct_l4proto_find(u8 l4proto)97 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
98 {
99 switch (l4proto) {
100 case IPPROTO_UDP: return &nf_conntrack_l4proto_udp;
101 case IPPROTO_TCP: return &nf_conntrack_l4proto_tcp;
102 case IPPROTO_ICMP: return &nf_conntrack_l4proto_icmp;
103 #ifdef CONFIG_NF_CT_PROTO_DCCP
104 case IPPROTO_DCCP: return &nf_conntrack_l4proto_dccp;
105 #endif
106 #ifdef CONFIG_NF_CT_PROTO_SCTP
107 case IPPROTO_SCTP: return &nf_conntrack_l4proto_sctp;
108 #endif
109 #ifdef CONFIG_NF_CT_PROTO_UDPLITE
110 case IPPROTO_UDPLITE: return &nf_conntrack_l4proto_udplite;
111 #endif
112 #ifdef CONFIG_NF_CT_PROTO_GRE
113 case IPPROTO_GRE: return &nf_conntrack_l4proto_gre;
114 #endif
115 #if IS_ENABLED(CONFIG_IPV6)
116 case IPPROTO_ICMPV6: return &nf_conntrack_l4proto_icmpv6;
117 #endif /* CONFIG_IPV6 */
118 }
119
120 return &nf_conntrack_l4proto_generic;
121 };
122 EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
123
in_vrf_postrouting(const struct nf_hook_state * state)124 static bool in_vrf_postrouting(const struct nf_hook_state *state)
125 {
126 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
127 if (state->hook == NF_INET_POST_ROUTING &&
128 netif_is_l3_master(state->out))
129 return true;
130 #endif
131 return false;
132 }
133
nf_confirm(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)134 unsigned int nf_confirm(void *priv,
135 struct sk_buff *skb,
136 const struct nf_hook_state *state)
137 {
138 const struct nf_conn_help *help;
139 enum ip_conntrack_info ctinfo;
140 unsigned int protoff;
141 struct nf_conn *ct;
142 bool seqadj_needed;
143 __be16 frag_off;
144 int start;
145 u8 pnum;
146
147 ct = nf_ct_get(skb, &ctinfo);
148 if (!ct || in_vrf_postrouting(state))
149 return NF_ACCEPT;
150
151 help = nfct_help(ct);
152
153 seqadj_needed = test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_is_loopback_packet(skb);
154 if (!help && !seqadj_needed)
155 return nf_conntrack_confirm(skb);
156
157 /* helper->help() do not expect ICMP packets */
158 if (ctinfo == IP_CT_RELATED_REPLY)
159 return nf_conntrack_confirm(skb);
160
161 switch (nf_ct_l3num(ct)) {
162 case NFPROTO_IPV4:
163 protoff = skb_network_offset(skb) + ip_hdrlen(skb);
164 break;
165 case NFPROTO_IPV6:
166 pnum = ipv6_hdr(skb)->nexthdr;
167 start = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum, &frag_off);
168 if (start < 0 || (frag_off & htons(~0x7)) != 0)
169 return nf_conntrack_confirm(skb);
170
171 protoff = start;
172 break;
173 default:
174 return nf_conntrack_confirm(skb);
175 }
176
177 if (help) {
178 const struct nf_conntrack_helper *helper;
179 int ret;
180
181 /* rcu_read_lock()ed by nf_hook */
182 helper = rcu_dereference(help->helper);
183 if (helper) {
184 ret = helper->help(skb,
185 protoff,
186 ct, ctinfo);
187 if (ret != NF_ACCEPT)
188 return ret;
189 }
190 }
191
192 if (seqadj_needed &&
193 !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
194 NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
195 return NF_DROP;
196 }
197
198 /* We've seen it coming out the other side: confirm it */
199 return nf_conntrack_confirm(skb);
200 }
201 EXPORT_SYMBOL_GPL(nf_confirm);
202
ipv4_conntrack_in(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)203 static unsigned int ipv4_conntrack_in(void *priv,
204 struct sk_buff *skb,
205 const struct nf_hook_state *state)
206 {
207 return nf_conntrack_in(skb, state);
208 }
209
ipv4_conntrack_local(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)210 static unsigned int ipv4_conntrack_local(void *priv,
211 struct sk_buff *skb,
212 const struct nf_hook_state *state)
213 {
214 if (ip_is_fragment(ip_hdr(skb))) { /* IP_NODEFRAG setsockopt set */
215 enum ip_conntrack_info ctinfo;
216 struct nf_conn *tmpl;
217
218 tmpl = nf_ct_get(skb, &ctinfo);
219 if (tmpl && nf_ct_is_template(tmpl)) {
220 /* when skipping ct, clear templates to avoid fooling
221 * later targets/matches
222 */
223 skb->_nfct = 0;
224 nf_ct_put(tmpl);
225 }
226 return NF_ACCEPT;
227 }
228
229 return nf_conntrack_in(skb, state);
230 }
231
232 /* Connection tracking may drop packets, but never alters them, so
233 * make it the first hook.
234 */
235 static const struct nf_hook_ops ipv4_conntrack_ops[] = {
236 {
237 .hook = ipv4_conntrack_in,
238 .pf = NFPROTO_IPV4,
239 .hooknum = NF_INET_PRE_ROUTING,
240 .priority = NF_IP_PRI_CONNTRACK,
241 },
242 {
243 .hook = ipv4_conntrack_local,
244 .pf = NFPROTO_IPV4,
245 .hooknum = NF_INET_LOCAL_OUT,
246 .priority = NF_IP_PRI_CONNTRACK,
247 },
248 {
249 .hook = nf_confirm,
250 .pf = NFPROTO_IPV4,
251 .hooknum = NF_INET_POST_ROUTING,
252 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
253 },
254 {
255 .hook = nf_confirm,
256 .pf = NFPROTO_IPV4,
257 .hooknum = NF_INET_LOCAL_IN,
258 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
259 },
260 };
261
262 /* Fast function for those who don't want to parse /proc (and I don't
263 * blame them).
264 * Reversing the socket's dst/src point of view gives us the reply
265 * mapping.
266 */
267 static int
getorigdst(struct sock * sk,int optval,void __user * user,int * len)268 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
269 {
270 const struct inet_sock *inet = inet_sk(sk);
271 const struct nf_conntrack_tuple_hash *h;
272 struct nf_conntrack_tuple tuple;
273
274 memset(&tuple, 0, sizeof(tuple));
275
276 lock_sock(sk);
277 tuple.src.u3.ip = inet->inet_rcv_saddr;
278 tuple.src.u.tcp.port = inet->inet_sport;
279 tuple.dst.u3.ip = inet->inet_daddr;
280 tuple.dst.u.tcp.port = inet->inet_dport;
281 tuple.src.l3num = PF_INET;
282 tuple.dst.protonum = sk->sk_protocol;
283 release_sock(sk);
284
285 /* We only do TCP and SCTP at the moment: is there a better way? */
286 if (tuple.dst.protonum != IPPROTO_TCP &&
287 tuple.dst.protonum != IPPROTO_SCTP)
288 return -ENOPROTOOPT;
289
290 if ((unsigned int)*len < sizeof(struct sockaddr_in))
291 return -EINVAL;
292
293 h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
294 if (h) {
295 struct sockaddr_in sin;
296 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
297
298 sin.sin_family = AF_INET;
299 sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
300 .tuple.dst.u.tcp.port;
301 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
302 .tuple.dst.u3.ip;
303 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
304
305 nf_ct_put(ct);
306 if (copy_to_user(user, &sin, sizeof(sin)) != 0)
307 return -EFAULT;
308 else
309 return 0;
310 }
311 return -ENOENT;
312 }
313
314 static struct nf_sockopt_ops so_getorigdst = {
315 .pf = PF_INET,
316 .get_optmin = SO_ORIGINAL_DST,
317 .get_optmax = SO_ORIGINAL_DST + 1,
318 .get = getorigdst,
319 .owner = THIS_MODULE,
320 };
321
322 #if IS_ENABLED(CONFIG_IPV6)
323 static int
ipv6_getorigdst(struct sock * sk,int optval,void __user * user,int * len)324 ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
325 {
326 struct nf_conntrack_tuple tuple = { .src.l3num = NFPROTO_IPV6 };
327 const struct ipv6_pinfo *inet6 = inet6_sk(sk);
328 const struct inet_sock *inet = inet_sk(sk);
329 const struct nf_conntrack_tuple_hash *h;
330 struct sockaddr_in6 sin6;
331 struct nf_conn *ct;
332 __be32 flow_label;
333 int bound_dev_if;
334
335 lock_sock(sk);
336 tuple.src.u3.in6 = sk->sk_v6_rcv_saddr;
337 tuple.src.u.tcp.port = inet->inet_sport;
338 tuple.dst.u3.in6 = sk->sk_v6_daddr;
339 tuple.dst.u.tcp.port = inet->inet_dport;
340 tuple.dst.protonum = sk->sk_protocol;
341 bound_dev_if = sk->sk_bound_dev_if;
342 flow_label = inet6->flow_label;
343 release_sock(sk);
344
345 if (tuple.dst.protonum != IPPROTO_TCP &&
346 tuple.dst.protonum != IPPROTO_SCTP)
347 return -ENOPROTOOPT;
348
349 if (*len < 0 || (unsigned int)*len < sizeof(sin6))
350 return -EINVAL;
351
352 h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
353 if (!h)
354 return -ENOENT;
355
356 ct = nf_ct_tuplehash_to_ctrack(h);
357
358 sin6.sin6_family = AF_INET6;
359 sin6.sin6_port = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.tcp.port;
360 sin6.sin6_flowinfo = flow_label & IPV6_FLOWINFO_MASK;
361 memcpy(&sin6.sin6_addr,
362 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
363 sizeof(sin6.sin6_addr));
364
365 nf_ct_put(ct);
366 sin6.sin6_scope_id = ipv6_iface_scope_id(&sin6.sin6_addr, bound_dev_if);
367 return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
368 }
369
370 static struct nf_sockopt_ops so_getorigdst6 = {
371 .pf = NFPROTO_IPV6,
372 .get_optmin = IP6T_SO_ORIGINAL_DST,
373 .get_optmax = IP6T_SO_ORIGINAL_DST + 1,
374 .get = ipv6_getorigdst,
375 .owner = THIS_MODULE,
376 };
377
ipv6_conntrack_in(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)378 static unsigned int ipv6_conntrack_in(void *priv,
379 struct sk_buff *skb,
380 const struct nf_hook_state *state)
381 {
382 return nf_conntrack_in(skb, state);
383 }
384
ipv6_conntrack_local(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)385 static unsigned int ipv6_conntrack_local(void *priv,
386 struct sk_buff *skb,
387 const struct nf_hook_state *state)
388 {
389 return nf_conntrack_in(skb, state);
390 }
391
392 static const struct nf_hook_ops ipv6_conntrack_ops[] = {
393 {
394 .hook = ipv6_conntrack_in,
395 .pf = NFPROTO_IPV6,
396 .hooknum = NF_INET_PRE_ROUTING,
397 .priority = NF_IP6_PRI_CONNTRACK,
398 },
399 {
400 .hook = ipv6_conntrack_local,
401 .pf = NFPROTO_IPV6,
402 .hooknum = NF_INET_LOCAL_OUT,
403 .priority = NF_IP6_PRI_CONNTRACK,
404 },
405 {
406 .hook = nf_confirm,
407 .pf = NFPROTO_IPV6,
408 .hooknum = NF_INET_POST_ROUTING,
409 .priority = NF_IP6_PRI_LAST,
410 },
411 {
412 .hook = nf_confirm,
413 .pf = NFPROTO_IPV6,
414 .hooknum = NF_INET_LOCAL_IN,
415 .priority = NF_IP6_PRI_LAST - 1,
416 },
417 };
418 #endif
419
nf_ct_tcp_fixup(struct nf_conn * ct,void * _nfproto)420 static int nf_ct_tcp_fixup(struct nf_conn *ct, void *_nfproto)
421 {
422 u8 nfproto = (unsigned long)_nfproto;
423
424 if (nf_ct_l3num(ct) != nfproto)
425 return 0;
426
427 if (nf_ct_protonum(ct) == IPPROTO_TCP &&
428 ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED) {
429 ct->proto.tcp.seen[0].td_maxwin = 0;
430 ct->proto.tcp.seen[1].td_maxwin = 0;
431 }
432
433 return 0;
434 }
435
436 static struct nf_ct_bridge_info *nf_ct_bridge_info;
437
nf_ct_netns_do_get(struct net * net,u8 nfproto)438 static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
439 {
440 struct nf_conntrack_net *cnet = nf_ct_pernet(net);
441 bool fixup_needed = false, retry = true;
442 int err = 0;
443 retry:
444 mutex_lock(&nf_ct_proto_mutex);
445
446 switch (nfproto) {
447 case NFPROTO_IPV4:
448 cnet->users4++;
449 if (cnet->users4 > 1)
450 goto out_unlock;
451 err = nf_defrag_ipv4_enable(net);
452 if (err) {
453 cnet->users4 = 0;
454 goto out_unlock;
455 }
456
457 err = nf_register_net_hooks(net, ipv4_conntrack_ops,
458 ARRAY_SIZE(ipv4_conntrack_ops));
459 if (err)
460 cnet->users4 = 0;
461 else
462 fixup_needed = true;
463 break;
464 #if IS_ENABLED(CONFIG_IPV6)
465 case NFPROTO_IPV6:
466 cnet->users6++;
467 if (cnet->users6 > 1)
468 goto out_unlock;
469 err = nf_defrag_ipv6_enable(net);
470 if (err < 0) {
471 cnet->users6 = 0;
472 goto out_unlock;
473 }
474
475 err = nf_register_net_hooks(net, ipv6_conntrack_ops,
476 ARRAY_SIZE(ipv6_conntrack_ops));
477 if (err)
478 cnet->users6 = 0;
479 else
480 fixup_needed = true;
481 break;
482 #endif
483 case NFPROTO_BRIDGE:
484 if (!nf_ct_bridge_info) {
485 if (!retry) {
486 err = -EPROTO;
487 goto out_unlock;
488 }
489 mutex_unlock(&nf_ct_proto_mutex);
490 request_module("nf_conntrack_bridge");
491 retry = false;
492 goto retry;
493 }
494 if (!try_module_get(nf_ct_bridge_info->me)) {
495 err = -EPROTO;
496 goto out_unlock;
497 }
498 cnet->users_bridge++;
499 if (cnet->users_bridge > 1)
500 goto out_unlock;
501
502 err = nf_register_net_hooks(net, nf_ct_bridge_info->ops,
503 nf_ct_bridge_info->ops_size);
504 if (err)
505 cnet->users_bridge = 0;
506 else
507 fixup_needed = true;
508 break;
509 default:
510 err = -EPROTO;
511 break;
512 }
513 out_unlock:
514 mutex_unlock(&nf_ct_proto_mutex);
515
516 if (fixup_needed) {
517 struct nf_ct_iter_data iter_data = {
518 .net = net,
519 .data = (void *)(unsigned long)nfproto,
520 };
521 nf_ct_iterate_cleanup_net(nf_ct_tcp_fixup, &iter_data);
522 }
523
524 return err;
525 }
526
nf_ct_netns_do_put(struct net * net,u8 nfproto)527 static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
528 {
529 struct nf_conntrack_net *cnet = nf_ct_pernet(net);
530
531 mutex_lock(&nf_ct_proto_mutex);
532 switch (nfproto) {
533 case NFPROTO_IPV4:
534 if (cnet->users4 && (--cnet->users4 == 0)) {
535 nf_unregister_net_hooks(net, ipv4_conntrack_ops,
536 ARRAY_SIZE(ipv4_conntrack_ops));
537 nf_defrag_ipv4_disable(net);
538 }
539 break;
540 #if IS_ENABLED(CONFIG_IPV6)
541 case NFPROTO_IPV6:
542 if (cnet->users6 && (--cnet->users6 == 0)) {
543 nf_unregister_net_hooks(net, ipv6_conntrack_ops,
544 ARRAY_SIZE(ipv6_conntrack_ops));
545 nf_defrag_ipv6_disable(net);
546 }
547 break;
548 #endif
549 case NFPROTO_BRIDGE:
550 if (!nf_ct_bridge_info)
551 break;
552 if (cnet->users_bridge && (--cnet->users_bridge == 0))
553 nf_unregister_net_hooks(net, nf_ct_bridge_info->ops,
554 nf_ct_bridge_info->ops_size);
555
556 module_put(nf_ct_bridge_info->me);
557 break;
558 }
559 mutex_unlock(&nf_ct_proto_mutex);
560 }
561
nf_ct_netns_inet_get(struct net * net)562 static int nf_ct_netns_inet_get(struct net *net)
563 {
564 int err;
565
566 err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
567 #if IS_ENABLED(CONFIG_IPV6)
568 if (err < 0)
569 goto err1;
570 err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
571 if (err < 0)
572 goto err2;
573
574 return err;
575 err2:
576 nf_ct_netns_put(net, NFPROTO_IPV4);
577 err1:
578 #endif
579 return err;
580 }
581
nf_ct_netns_get(struct net * net,u8 nfproto)582 int nf_ct_netns_get(struct net *net, u8 nfproto)
583 {
584 int err;
585
586 switch (nfproto) {
587 case NFPROTO_INET:
588 err = nf_ct_netns_inet_get(net);
589 break;
590 case NFPROTO_BRIDGE:
591 err = nf_ct_netns_do_get(net, NFPROTO_BRIDGE);
592 if (err < 0)
593 return err;
594
595 err = nf_ct_netns_inet_get(net);
596 if (err < 0) {
597 nf_ct_netns_put(net, NFPROTO_BRIDGE);
598 return err;
599 }
600 break;
601 default:
602 err = nf_ct_netns_do_get(net, nfproto);
603 break;
604 }
605 return err;
606 }
607 EXPORT_SYMBOL_GPL(nf_ct_netns_get);
608
nf_ct_netns_put(struct net * net,uint8_t nfproto)609 void nf_ct_netns_put(struct net *net, uint8_t nfproto)
610 {
611 switch (nfproto) {
612 case NFPROTO_BRIDGE:
613 nf_ct_netns_do_put(net, NFPROTO_BRIDGE);
614 fallthrough;
615 case NFPROTO_INET:
616 nf_ct_netns_do_put(net, NFPROTO_IPV4);
617 nf_ct_netns_do_put(net, NFPROTO_IPV6);
618 break;
619 default:
620 nf_ct_netns_do_put(net, nfproto);
621 break;
622 }
623 }
624 EXPORT_SYMBOL_GPL(nf_ct_netns_put);
625
nf_ct_bridge_register(struct nf_ct_bridge_info * info)626 void nf_ct_bridge_register(struct nf_ct_bridge_info *info)
627 {
628 WARN_ON(nf_ct_bridge_info);
629 mutex_lock(&nf_ct_proto_mutex);
630 nf_ct_bridge_info = info;
631 mutex_unlock(&nf_ct_proto_mutex);
632 }
633 EXPORT_SYMBOL_GPL(nf_ct_bridge_register);
634
nf_ct_bridge_unregister(struct nf_ct_bridge_info * info)635 void nf_ct_bridge_unregister(struct nf_ct_bridge_info *info)
636 {
637 WARN_ON(!nf_ct_bridge_info);
638 mutex_lock(&nf_ct_proto_mutex);
639 nf_ct_bridge_info = NULL;
640 mutex_unlock(&nf_ct_proto_mutex);
641 }
642 EXPORT_SYMBOL_GPL(nf_ct_bridge_unregister);
643
nf_conntrack_proto_init(void)644 int nf_conntrack_proto_init(void)
645 {
646 int ret;
647
648 ret = nf_register_sockopt(&so_getorigdst);
649 if (ret < 0)
650 return ret;
651
652 #if IS_ENABLED(CONFIG_IPV6)
653 ret = nf_register_sockopt(&so_getorigdst6);
654 if (ret < 0)
655 goto cleanup_sockopt;
656 #endif
657
658 return ret;
659
660 #if IS_ENABLED(CONFIG_IPV6)
661 cleanup_sockopt:
662 nf_unregister_sockopt(&so_getorigdst);
663 #endif
664 return ret;
665 }
666
nf_conntrack_proto_fini(void)667 void nf_conntrack_proto_fini(void)
668 {
669 nf_unregister_sockopt(&so_getorigdst);
670 #if IS_ENABLED(CONFIG_IPV6)
671 nf_unregister_sockopt(&so_getorigdst6);
672 #endif
673 }
674
nf_conntrack_proto_pernet_init(struct net * net)675 void nf_conntrack_proto_pernet_init(struct net *net)
676 {
677 nf_conntrack_generic_init_net(net);
678 nf_conntrack_udp_init_net(net);
679 nf_conntrack_tcp_init_net(net);
680 nf_conntrack_icmp_init_net(net);
681 #if IS_ENABLED(CONFIG_IPV6)
682 nf_conntrack_icmpv6_init_net(net);
683 #endif
684 #ifdef CONFIG_NF_CT_PROTO_DCCP
685 nf_conntrack_dccp_init_net(net);
686 #endif
687 #ifdef CONFIG_NF_CT_PROTO_SCTP
688 nf_conntrack_sctp_init_net(net);
689 #endif
690 #ifdef CONFIG_NF_CT_PROTO_GRE
691 nf_conntrack_gre_init_net(net);
692 #endif
693 }
694
695 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
696 &nf_conntrack_htable_size, 0600);
697
698 MODULE_ALIAS("ip_conntrack");
699 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
700 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
701 MODULE_LICENSE("GPL");
702 MODULE_DESCRIPTION("IPv4 and IPv6 connection tracking");
703