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 /* nfnetlink_log may re-enter conntrack attribute dumping and try to
83 * take ct->lock again via helpers such as tcp_to_nlattr(), so invalid
84 * conntrack logs must only be emitted after dropping ct->lock.
85 */
86 lockdep_assert_not_held(&ct->lock);
87
88 net = nf_ct_net(ct);
89 if (likely(net->ct.sysctl_log_invalid == 0))
90 return;
91
92 va_start(args, fmt);
93 vaf.fmt = fmt;
94 vaf.va = &args;
95
96 nf_l4proto_log_invalid(skb, state,
97 nf_ct_protonum(ct), "%pV", &vaf);
98 va_end(args);
99 }
100 EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
101 #endif
102
nf_ct_l4proto_find(u8 l4proto)103 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
104 {
105 switch (l4proto) {
106 case IPPROTO_UDP: return &nf_conntrack_l4proto_udp;
107 case IPPROTO_TCP: return &nf_conntrack_l4proto_tcp;
108 case IPPROTO_ICMP: return &nf_conntrack_l4proto_icmp;
109 #ifdef CONFIG_NF_CT_PROTO_SCTP
110 case IPPROTO_SCTP: return &nf_conntrack_l4proto_sctp;
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 int (*helper_cb)(struct sk_buff *skb, unsigned int protoff,
139 struct nf_conn *ct,
140 enum ip_conntrack_info conntrackinfo);
141 const struct nf_conn_help *help;
142 enum ip_conntrack_info ctinfo;
143 unsigned int protoff;
144 struct nf_conn *ct;
145 bool seqadj_needed;
146 __be16 frag_off;
147 int start;
148 u8 pnum;
149
150 ct = nf_ct_get(skb, &ctinfo);
151 if (!ct || in_vrf_postrouting(state))
152 return NF_ACCEPT;
153
154 help = nfct_help(ct);
155
156 seqadj_needed = test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_is_loopback_packet(skb);
157 if (!help && !seqadj_needed)
158 return nf_conntrack_confirm(skb);
159
160 /* helper->help() do not expect ICMP packets */
161 if (ctinfo == IP_CT_RELATED_REPLY)
162 return nf_conntrack_confirm(skb);
163
164 switch (nf_ct_l3num(ct)) {
165 case NFPROTO_IPV4:
166 protoff = skb_network_offset(skb) + ip_hdrlen(skb);
167 break;
168 case NFPROTO_IPV6:
169 pnum = ipv6_hdr(skb)->nexthdr;
170 start = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum, &frag_off);
171 if (start < 0 || (frag_off & htons(~0x7)) != 0)
172 return nf_conntrack_confirm(skb);
173
174 protoff = start;
175 break;
176 default:
177 return nf_conntrack_confirm(skb);
178 }
179
180 if (help) {
181 const struct nf_conntrack_helper *helper;
182 int ret;
183
184 /* rcu_read_lock()ed by nf_hook */
185 helper = rcu_dereference(help->helper);
186 if (helper) {
187 helper_cb = rcu_dereference(helper->help);
188 if (helper_cb) {
189 ret = helper_cb(skb, protoff,
190 ct, ctinfo);
191 if (ret != NF_ACCEPT)
192 return ret;
193 }
194 }
195 }
196
197 if (seqadj_needed &&
198 !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
199 NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
200 return NF_DROP;
201 }
202
203 /* We've seen it coming out the other side: confirm it */
204 return nf_conntrack_confirm(skb);
205 }
206 EXPORT_SYMBOL_GPL(nf_confirm);
207
ipv4_conntrack_in(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)208 static unsigned int ipv4_conntrack_in(void *priv,
209 struct sk_buff *skb,
210 const struct nf_hook_state *state)
211 {
212 return nf_conntrack_in(skb, state);
213 }
214
ipv4_conntrack_local(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)215 static unsigned int ipv4_conntrack_local(void *priv,
216 struct sk_buff *skb,
217 const struct nf_hook_state *state)
218 {
219 if (ip_is_fragment(ip_hdr(skb))) { /* IP_NODEFRAG setsockopt set */
220 enum ip_conntrack_info ctinfo;
221 struct nf_conn *tmpl;
222
223 tmpl = nf_ct_get(skb, &ctinfo);
224 if (tmpl && nf_ct_is_template(tmpl)) {
225 /* when skipping ct, clear templates to avoid fooling
226 * later targets/matches
227 */
228 skb->_nfct = 0;
229 nf_ct_put(tmpl);
230 }
231 return NF_ACCEPT;
232 }
233
234 return nf_conntrack_in(skb, state);
235 }
236
237 /* Connection tracking may drop packets, but never alters them, so
238 * make it the first hook.
239 */
240 static const struct nf_hook_ops ipv4_conntrack_ops[] = {
241 {
242 .hook = ipv4_conntrack_in,
243 .pf = NFPROTO_IPV4,
244 .hooknum = NF_INET_PRE_ROUTING,
245 .priority = NF_IP_PRI_CONNTRACK,
246 },
247 {
248 .hook = ipv4_conntrack_local,
249 .pf = NFPROTO_IPV4,
250 .hooknum = NF_INET_LOCAL_OUT,
251 .priority = NF_IP_PRI_CONNTRACK,
252 },
253 {
254 .hook = nf_confirm,
255 .pf = NFPROTO_IPV4,
256 .hooknum = NF_INET_POST_ROUTING,
257 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
258 },
259 {
260 .hook = nf_confirm,
261 .pf = NFPROTO_IPV4,
262 .hooknum = NF_INET_LOCAL_IN,
263 .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
264 },
265 };
266
267 /* Fast function for those who don't want to parse /proc (and I don't
268 * blame them).
269 * Reversing the socket's dst/src point of view gives us the reply
270 * mapping.
271 */
272 static int
getorigdst(struct sock * sk,int optval,void __user * user,int * len)273 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
274 {
275 const struct inet_sock *inet = inet_sk(sk);
276 const struct nf_conntrack_tuple_hash *h;
277 struct nf_conntrack_tuple tuple;
278
279 memset(&tuple, 0, sizeof(tuple));
280
281 lock_sock(sk);
282 tuple.src.u3.ip = inet->inet_rcv_saddr;
283 tuple.src.u.tcp.port = inet->inet_sport;
284 tuple.dst.u3.ip = inet->inet_daddr;
285 tuple.dst.u.tcp.port = inet->inet_dport;
286 tuple.src.l3num = PF_INET;
287 tuple.dst.protonum = sk->sk_protocol;
288 release_sock(sk);
289
290 /* We only do TCP and SCTP at the moment: is there a better way? */
291 if (tuple.dst.protonum != IPPROTO_TCP &&
292 tuple.dst.protonum != IPPROTO_SCTP)
293 return -ENOPROTOOPT;
294
295 if ((unsigned int)*len < sizeof(struct sockaddr_in))
296 return -EINVAL;
297
298 h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
299 if (h) {
300 struct sockaddr_in sin;
301 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
302
303 sin.sin_family = AF_INET;
304 sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
305 .tuple.dst.u.tcp.port;
306 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
307 .tuple.dst.u3.ip;
308 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
309
310 nf_ct_put(ct);
311 if (copy_to_user(user, &sin, sizeof(sin)) != 0)
312 return -EFAULT;
313 else
314 return 0;
315 }
316 return -ENOENT;
317 }
318
319 static struct nf_sockopt_ops so_getorigdst = {
320 .pf = PF_INET,
321 .get_optmin = SO_ORIGINAL_DST,
322 .get_optmax = SO_ORIGINAL_DST + 1,
323 .get = getorigdst,
324 .owner = THIS_MODULE,
325 };
326
327 #if IS_ENABLED(CONFIG_IPV6)
328 static int
ipv6_getorigdst(struct sock * sk,int optval,void __user * user,int * len)329 ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
330 {
331 struct nf_conntrack_tuple tuple = { .src.l3num = NFPROTO_IPV6 };
332 const struct ipv6_pinfo *inet6 = inet6_sk(sk);
333 const struct inet_sock *inet = inet_sk(sk);
334 const struct nf_conntrack_tuple_hash *h;
335 struct sockaddr_in6 sin6;
336 struct nf_conn *ct;
337 __be32 flow_label;
338 int bound_dev_if;
339
340 lock_sock(sk);
341 tuple.src.u3.in6 = sk->sk_v6_rcv_saddr;
342 tuple.src.u.tcp.port = inet->inet_sport;
343 tuple.dst.u3.in6 = sk->sk_v6_daddr;
344 tuple.dst.u.tcp.port = inet->inet_dport;
345 tuple.dst.protonum = sk->sk_protocol;
346 bound_dev_if = sk->sk_bound_dev_if;
347 flow_label = inet6->flow_label;
348 release_sock(sk);
349
350 if (tuple.dst.protonum != IPPROTO_TCP &&
351 tuple.dst.protonum != IPPROTO_SCTP)
352 return -ENOPROTOOPT;
353
354 if (*len < 0 || (unsigned int)*len < sizeof(sin6))
355 return -EINVAL;
356
357 h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
358 if (!h)
359 return -ENOENT;
360
361 ct = nf_ct_tuplehash_to_ctrack(h);
362
363 sin6.sin6_family = AF_INET6;
364 sin6.sin6_port = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.tcp.port;
365 sin6.sin6_flowinfo = flow_label & IPV6_FLOWINFO_MASK;
366 memcpy(&sin6.sin6_addr,
367 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
368 sizeof(sin6.sin6_addr));
369
370 nf_ct_put(ct);
371 sin6.sin6_scope_id = ipv6_iface_scope_id(&sin6.sin6_addr, bound_dev_if);
372 return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
373 }
374
375 static struct nf_sockopt_ops so_getorigdst6 = {
376 .pf = NFPROTO_IPV6,
377 .get_optmin = IP6T_SO_ORIGINAL_DST,
378 .get_optmax = IP6T_SO_ORIGINAL_DST + 1,
379 .get = ipv6_getorigdst,
380 .owner = THIS_MODULE,
381 };
382
ipv6_conntrack_in(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)383 static unsigned int ipv6_conntrack_in(void *priv,
384 struct sk_buff *skb,
385 const struct nf_hook_state *state)
386 {
387 return nf_conntrack_in(skb, state);
388 }
389
ipv6_conntrack_local(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)390 static unsigned int ipv6_conntrack_local(void *priv,
391 struct sk_buff *skb,
392 const struct nf_hook_state *state)
393 {
394 return nf_conntrack_in(skb, state);
395 }
396
397 static const struct nf_hook_ops ipv6_conntrack_ops[] = {
398 {
399 .hook = ipv6_conntrack_in,
400 .pf = NFPROTO_IPV6,
401 .hooknum = NF_INET_PRE_ROUTING,
402 .priority = NF_IP6_PRI_CONNTRACK,
403 },
404 {
405 .hook = ipv6_conntrack_local,
406 .pf = NFPROTO_IPV6,
407 .hooknum = NF_INET_LOCAL_OUT,
408 .priority = NF_IP6_PRI_CONNTRACK,
409 },
410 {
411 .hook = nf_confirm,
412 .pf = NFPROTO_IPV6,
413 .hooknum = NF_INET_POST_ROUTING,
414 .priority = NF_IP6_PRI_LAST,
415 },
416 {
417 .hook = nf_confirm,
418 .pf = NFPROTO_IPV6,
419 .hooknum = NF_INET_LOCAL_IN,
420 .priority = NF_IP6_PRI_LAST - 1,
421 },
422 };
423 #endif
424
nf_ct_tcp_fixup(struct nf_conn * ct,void * _nfproto)425 static int nf_ct_tcp_fixup(struct nf_conn *ct, void *_nfproto)
426 {
427 u8 nfproto = (unsigned long)_nfproto;
428
429 if (nf_ct_l3num(ct) != nfproto)
430 return 0;
431
432 if (nf_ct_protonum(ct) == IPPROTO_TCP &&
433 ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED) {
434 ct->proto.tcp.seen[0].td_maxwin = 0;
435 ct->proto.tcp.seen[1].td_maxwin = 0;
436 }
437
438 return 0;
439 }
440
441 static struct nf_ct_bridge_info *nf_ct_bridge_info;
442
nf_ct_netns_do_get(struct net * net,u8 nfproto)443 static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
444 {
445 struct nf_conntrack_net *cnet = nf_ct_pernet(net);
446 bool fixup_needed = false, retry = true;
447 int err = 0;
448 retry:
449 mutex_lock(&nf_ct_proto_mutex);
450
451 switch (nfproto) {
452 case NFPROTO_IPV4:
453 cnet->users4++;
454 if (cnet->users4 > 1)
455 goto out_unlock;
456 err = nf_defrag_ipv4_enable(net);
457 if (err) {
458 cnet->users4 = 0;
459 goto out_unlock;
460 }
461
462 err = nf_register_net_hooks(net, ipv4_conntrack_ops,
463 ARRAY_SIZE(ipv4_conntrack_ops));
464 if (err)
465 cnet->users4 = 0;
466 else
467 fixup_needed = true;
468 break;
469 #if IS_ENABLED(CONFIG_IPV6)
470 case NFPROTO_IPV6:
471 cnet->users6++;
472 if (cnet->users6 > 1)
473 goto out_unlock;
474 err = nf_defrag_ipv6_enable(net);
475 if (err < 0) {
476 cnet->users6 = 0;
477 goto out_unlock;
478 }
479
480 err = nf_register_net_hooks(net, ipv6_conntrack_ops,
481 ARRAY_SIZE(ipv6_conntrack_ops));
482 if (err)
483 cnet->users6 = 0;
484 else
485 fixup_needed = true;
486 break;
487 #endif
488 case NFPROTO_BRIDGE:
489 if (!nf_ct_bridge_info) {
490 if (!retry) {
491 err = -EPROTO;
492 goto out_unlock;
493 }
494 mutex_unlock(&nf_ct_proto_mutex);
495 request_module("nf_conntrack_bridge");
496 retry = false;
497 goto retry;
498 }
499 if (!try_module_get(nf_ct_bridge_info->me)) {
500 err = -EPROTO;
501 goto out_unlock;
502 }
503 cnet->users_bridge++;
504 if (cnet->users_bridge > 1)
505 goto out_unlock;
506
507 err = nf_register_net_hooks(net, nf_ct_bridge_info->ops,
508 nf_ct_bridge_info->ops_size);
509 if (err)
510 cnet->users_bridge = 0;
511 else
512 fixup_needed = true;
513 break;
514 default:
515 err = -EPROTO;
516 break;
517 }
518 out_unlock:
519 mutex_unlock(&nf_ct_proto_mutex);
520
521 if (fixup_needed) {
522 struct nf_ct_iter_data iter_data = {
523 .net = net,
524 .data = (void *)(unsigned long)nfproto,
525 };
526 nf_ct_iterate_cleanup_net(nf_ct_tcp_fixup, &iter_data);
527 }
528
529 return err;
530 }
531
nf_ct_netns_do_put(struct net * net,u8 nfproto)532 static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
533 {
534 struct nf_conntrack_net *cnet = nf_ct_pernet(net);
535
536 mutex_lock(&nf_ct_proto_mutex);
537 switch (nfproto) {
538 case NFPROTO_IPV4:
539 if (cnet->users4 && (--cnet->users4 == 0)) {
540 nf_unregister_net_hooks(net, ipv4_conntrack_ops,
541 ARRAY_SIZE(ipv4_conntrack_ops));
542 nf_defrag_ipv4_disable(net);
543 }
544 break;
545 #if IS_ENABLED(CONFIG_IPV6)
546 case NFPROTO_IPV6:
547 if (cnet->users6 && (--cnet->users6 == 0)) {
548 nf_unregister_net_hooks(net, ipv6_conntrack_ops,
549 ARRAY_SIZE(ipv6_conntrack_ops));
550 nf_defrag_ipv6_disable(net);
551 }
552 break;
553 #endif
554 case NFPROTO_BRIDGE:
555 if (!nf_ct_bridge_info)
556 break;
557 if (cnet->users_bridge && (--cnet->users_bridge == 0))
558 nf_unregister_net_hooks(net, nf_ct_bridge_info->ops,
559 nf_ct_bridge_info->ops_size);
560
561 module_put(nf_ct_bridge_info->me);
562 break;
563 }
564 mutex_unlock(&nf_ct_proto_mutex);
565 }
566
nf_ct_netns_inet_get(struct net * net)567 static int nf_ct_netns_inet_get(struct net *net)
568 {
569 int err;
570
571 err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
572 #if IS_ENABLED(CONFIG_IPV6)
573 if (err < 0)
574 goto err1;
575 err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
576 if (err < 0)
577 goto err2;
578
579 return err;
580 err2:
581 nf_ct_netns_put(net, NFPROTO_IPV4);
582 err1:
583 #endif
584 return err;
585 }
586
nf_ct_netns_get(struct net * net,u8 nfproto)587 int nf_ct_netns_get(struct net *net, u8 nfproto)
588 {
589 int err;
590
591 switch (nfproto) {
592 case NFPROTO_INET:
593 err = nf_ct_netns_inet_get(net);
594 break;
595 case NFPROTO_BRIDGE:
596 err = nf_ct_netns_do_get(net, NFPROTO_BRIDGE);
597 if (err < 0)
598 return err;
599
600 err = nf_ct_netns_inet_get(net);
601 if (err < 0) {
602 nf_ct_netns_put(net, NFPROTO_BRIDGE);
603 return err;
604 }
605 break;
606 default:
607 err = nf_ct_netns_do_get(net, nfproto);
608 break;
609 }
610 return err;
611 }
612 EXPORT_SYMBOL_GPL(nf_ct_netns_get);
613
nf_ct_netns_put(struct net * net,uint8_t nfproto)614 void nf_ct_netns_put(struct net *net, uint8_t nfproto)
615 {
616 switch (nfproto) {
617 case NFPROTO_BRIDGE:
618 nf_ct_netns_do_put(net, NFPROTO_BRIDGE);
619 fallthrough;
620 case NFPROTO_INET:
621 nf_ct_netns_do_put(net, NFPROTO_IPV4);
622 nf_ct_netns_do_put(net, NFPROTO_IPV6);
623 break;
624 default:
625 nf_ct_netns_do_put(net, nfproto);
626 break;
627 }
628 }
629 EXPORT_SYMBOL_GPL(nf_ct_netns_put);
630
nf_ct_bridge_register(struct nf_ct_bridge_info * info)631 void nf_ct_bridge_register(struct nf_ct_bridge_info *info)
632 {
633 WARN_ON(nf_ct_bridge_info);
634 mutex_lock(&nf_ct_proto_mutex);
635 nf_ct_bridge_info = info;
636 mutex_unlock(&nf_ct_proto_mutex);
637 }
638 EXPORT_SYMBOL_GPL(nf_ct_bridge_register);
639
nf_ct_bridge_unregister(struct nf_ct_bridge_info * info)640 void nf_ct_bridge_unregister(struct nf_ct_bridge_info *info)
641 {
642 WARN_ON(!nf_ct_bridge_info);
643 mutex_lock(&nf_ct_proto_mutex);
644 nf_ct_bridge_info = NULL;
645 mutex_unlock(&nf_ct_proto_mutex);
646 }
647 EXPORT_SYMBOL_GPL(nf_ct_bridge_unregister);
648
nf_conntrack_proto_init(void)649 int nf_conntrack_proto_init(void)
650 {
651 int ret;
652
653 ret = nf_register_sockopt(&so_getorigdst);
654 if (ret < 0)
655 return ret;
656
657 #if IS_ENABLED(CONFIG_IPV6)
658 ret = nf_register_sockopt(&so_getorigdst6);
659 if (ret < 0)
660 goto cleanup_sockopt;
661 #endif
662
663 return ret;
664
665 #if IS_ENABLED(CONFIG_IPV6)
666 cleanup_sockopt:
667 nf_unregister_sockopt(&so_getorigdst);
668 #endif
669 return ret;
670 }
671
nf_conntrack_proto_fini(void)672 void nf_conntrack_proto_fini(void)
673 {
674 nf_unregister_sockopt(&so_getorigdst);
675 #if IS_ENABLED(CONFIG_IPV6)
676 nf_unregister_sockopt(&so_getorigdst6);
677 #endif
678 }
679
nf_conntrack_proto_pernet_init(struct net * net)680 void nf_conntrack_proto_pernet_init(struct net *net)
681 {
682 nf_conntrack_generic_init_net(net);
683 nf_conntrack_udp_init_net(net);
684 nf_conntrack_tcp_init_net(net);
685 nf_conntrack_icmp_init_net(net);
686 #if IS_ENABLED(CONFIG_IPV6)
687 nf_conntrack_icmpv6_init_net(net);
688 #endif
689 #ifdef CONFIG_NF_CT_PROTO_SCTP
690 nf_conntrack_sctp_init_net(net);
691 #endif
692 #ifdef CONFIG_NF_CT_PROTO_GRE
693 nf_conntrack_gre_init_net(net);
694 #endif
695 }
696
697 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
698 &nf_conntrack_htable_size, 0600);
699
700 MODULE_ALIAS("ip_conntrack");
701 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
702 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
703 MODULE_LICENSE("GPL");
704 MODULE_DESCRIPTION("IPv4 and IPv6 connection tracking");
705